1 // SPDX-License-Identifier: GPL-2.0-only
3 * Security-Enhanced Linux (SELinux) security module
5 * This file contains the SELinux hook function implementations.
12 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
15 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
17 * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P.
19 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
21 * Copyright (C) 2016 Mellanox Technologies
24 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/kernel_read_file.h>
28 #include <linux/errno.h>
29 #include <linux/sched/signal.h>
30 #include <linux/sched/task.h>
31 #include <linux/lsm_hooks.h>
32 #include <linux/xattr.h>
33 #include <linux/capability.h>
34 #include <linux/unistd.h>
36 #include <linux/mman.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
39 #include <linux/proc_fs.h>
40 #include <linux/swap.h>
41 #include <linux/spinlock.h>
42 #include <linux/syscalls.h>
43 #include <linux/dcache.h>
44 #include <linux/file.h>
45 #include <linux/fdtable.h>
46 #include <linux/namei.h>
47 #include <linux/mount.h>
48 #include <linux/fs_context.h>
49 #include <linux/fs_parser.h>
50 #include <linux/netfilter_ipv4.h>
51 #include <linux/netfilter_ipv6.h>
52 #include <linux/tty.h>
54 #include <net/ip.h> /* for local_port_range[] */
55 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
56 #include <net/inet_connection_sock.h>
57 #include <net/net_namespace.h>
58 #include <net/netlabel.h>
59 #include <linux/uaccess.h>
60 #include <asm/ioctls.h>
61 #include <linux/atomic.h>
62 #include <linux/bitops.h>
63 #include <linux/interrupt.h>
64 #include <linux/netdevice.h> /* for network interface checks */
65 #include <net/netlink.h>
66 #include <linux/tcp.h>
67 #include <linux/udp.h>
68 #include <linux/dccp.h>
69 #include <linux/sctp.h>
70 #include <net/sctp/structs.h>
71 #include <linux/quota.h>
72 #include <linux/un.h> /* for Unix socket types */
73 #include <net/af_unix.h> /* for Unix socket types */
74 #include <linux/parser.h>
75 #include <linux/nfs_mount.h>
77 #include <linux/hugetlb.h>
78 #include <linux/personality.h>
79 #include <linux/audit.h>
80 #include <linux/string.h>
81 #include <linux/mutex.h>
82 #include <linux/posix-timers.h>
83 #include <linux/syslog.h>
84 #include <linux/user_namespace.h>
85 #include <linux/export.h>
86 #include <linux/msg.h>
87 #include <linux/shm.h>
88 #include <uapi/linux/shm.h>
89 #include <linux/bpf.h>
90 #include <linux/kernfs.h>
91 #include <linux/stringhash.h> /* for hashlen_string() */
92 #include <uapi/linux/mount.h>
93 #include <linux/fsnotify.h>
94 #include <linux/fanotify.h>
95 #include <linux/io_uring/cmd.h>
96 #include <uapi/linux/lsm.h>
105 #include "netlabel.h"
109 #define SELINUX_INODE_INIT_XATTRS 1
111 struct selinux_state selinux_state;
113 /* SECMARK reference count */
114 static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
116 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
117 static int selinux_enforcing_boot __initdata;
119 static int __init enforcing_setup(char *str)
121 unsigned long enforcing;
122 if (!kstrtoul(str, 0, &enforcing))
123 selinux_enforcing_boot = enforcing ? 1 : 0;
126 __setup("enforcing=", enforcing_setup);
128 #define selinux_enforcing_boot 1
131 int selinux_enabled_boot __initdata = 1;
132 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
133 static int __init selinux_enabled_setup(char *str)
135 unsigned long enabled;
136 if (!kstrtoul(str, 0, &enabled))
137 selinux_enabled_boot = enabled ? 1 : 0;
140 __setup("selinux=", selinux_enabled_setup);
143 static int __init checkreqprot_setup(char *str)
145 unsigned long checkreqprot;
147 if (!kstrtoul(str, 0, &checkreqprot)) {
149 pr_err("SELinux: checkreqprot set to 1 via kernel parameter. This is no longer supported.\n");
153 __setup("checkreqprot=", checkreqprot_setup);
156 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
159 * This function checks the SECMARK reference counter to see if any SECMARK
160 * targets are currently configured, if the reference counter is greater than
161 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
162 * enabled, false (0) if SECMARK is disabled. If the always_check_network
163 * policy capability is enabled, SECMARK is always considered enabled.
166 static int selinux_secmark_enabled(void)
168 return (selinux_policycap_alwaysnetwork() ||
169 atomic_read(&selinux_secmark_refcount));
173 * selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled
176 * This function checks if NetLabel or labeled IPSEC is enabled. Returns true
177 * (1) if any are enabled or false (0) if neither are enabled. If the
178 * always_check_network policy capability is enabled, peer labeling
179 * is always considered enabled.
182 static int selinux_peerlbl_enabled(void)
184 return (selinux_policycap_alwaysnetwork() ||
185 netlbl_enabled() || selinux_xfrm_enabled());
188 static int selinux_netcache_avc_callback(u32 event)
190 if (event == AVC_CALLBACK_RESET) {
199 static int selinux_lsm_notifier_avc_callback(u32 event)
201 if (event == AVC_CALLBACK_RESET) {
203 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
210 * initialise the security for the init task
212 static void cred_init_security(void)
214 struct task_security_struct *tsec;
216 tsec = selinux_cred(unrcu_pointer(current->real_cred));
217 tsec->osid = tsec->sid = SECINITSID_KERNEL;
221 * get the security ID of a set of credentials
223 static inline u32 cred_sid(const struct cred *cred)
225 const struct task_security_struct *tsec;
227 tsec = selinux_cred(cred);
231 static void __ad_net_init(struct common_audit_data *ad,
232 struct lsm_network_audit *net,
233 int ifindex, struct sock *sk, u16 family)
235 ad->type = LSM_AUDIT_DATA_NET;
237 net->netif = ifindex;
239 net->family = family;
242 static void ad_net_init_from_sk(struct common_audit_data *ad,
243 struct lsm_network_audit *net,
246 __ad_net_init(ad, net, 0, sk, 0);
249 static void ad_net_init_from_iif(struct common_audit_data *ad,
250 struct lsm_network_audit *net,
251 int ifindex, u16 family)
253 __ad_net_init(ad, net, ifindex, NULL, family);
257 * get the objective security ID of a task
259 static inline u32 task_sid_obj(const struct task_struct *task)
264 sid = cred_sid(__task_cred(task));
269 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
272 * Try reloading inode security labels that have been marked as invalid. The
273 * @may_sleep parameter indicates when sleeping and thus reloading labels is
274 * allowed; when set to false, returns -ECHILD when the label is
275 * invalid. The @dentry parameter should be set to a dentry of the inode.
277 static int __inode_security_revalidate(struct inode *inode,
278 struct dentry *dentry,
281 struct inode_security_struct *isec = selinux_inode(inode);
283 might_sleep_if(may_sleep);
286 * The check of isec->initialized below is racy but
287 * inode_doinit_with_dentry() will recheck with
290 if (selinux_initialized() &&
291 data_race(isec->initialized != LABEL_INITIALIZED)) {
296 * Try reloading the inode security label. This will fail if
297 * @opt_dentry is NULL and no dentry for this inode can be
298 * found; in that case, continue using the old label.
300 inode_doinit_with_dentry(inode, dentry);
305 static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
307 return selinux_inode(inode);
310 static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
314 error = __inode_security_revalidate(inode, NULL, !rcu);
316 return ERR_PTR(error);
317 return selinux_inode(inode);
321 * Get the security label of an inode.
323 static struct inode_security_struct *inode_security(struct inode *inode)
325 __inode_security_revalidate(inode, NULL, true);
326 return selinux_inode(inode);
329 static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
331 struct inode *inode = d_backing_inode(dentry);
333 return selinux_inode(inode);
337 * Get the security label of a dentry's backing inode.
339 static struct inode_security_struct *backing_inode_security(struct dentry *dentry)
341 struct inode *inode = d_backing_inode(dentry);
343 __inode_security_revalidate(inode, dentry, true);
344 return selinux_inode(inode);
347 static void inode_free_security(struct inode *inode)
349 struct inode_security_struct *isec = selinux_inode(inode);
350 struct superblock_security_struct *sbsec;
354 sbsec = selinux_superblock(inode->i_sb);
356 * As not all inode security structures are in a list, we check for
357 * empty list outside of the lock to make sure that we won't waste
358 * time taking a lock doing nothing.
360 * The list_del_init() function can be safely called more than once.
361 * It should not be possible for this function to be called with
362 * concurrent list_add(), but for better safety against future changes
363 * in the code, we use list_empty_careful() here.
365 if (!list_empty_careful(&isec->list)) {
366 spin_lock(&sbsec->isec_lock);
367 list_del_init(&isec->list);
368 spin_unlock(&sbsec->isec_lock);
372 struct selinux_mnt_opts {
379 static void selinux_free_mnt_opts(void *mnt_opts)
393 #define A(s, has_arg) {#s, sizeof(#s) - 1, Opt_##s, has_arg}
394 static const struct {
403 A(rootcontext, true),
408 static int match_opt_prefix(char *s, int l, char **arg)
412 for (i = 0; i < ARRAY_SIZE(tokens); i++) {
413 size_t len = tokens[i].len;
414 if (len > l || memcmp(s, tokens[i].name, len))
416 if (tokens[i].has_arg) {
417 if (len == l || s[len] != '=')
422 return tokens[i].opt;
427 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
429 static int may_context_mount_sb_relabel(u32 sid,
430 struct superblock_security_struct *sbsec,
431 const struct cred *cred)
433 const struct task_security_struct *tsec = selinux_cred(cred);
436 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
437 FILESYSTEM__RELABELFROM, NULL);
441 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
442 FILESYSTEM__RELABELTO, NULL);
446 static int may_context_mount_inode_relabel(u32 sid,
447 struct superblock_security_struct *sbsec,
448 const struct cred *cred)
450 const struct task_security_struct *tsec = selinux_cred(cred);
452 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
453 FILESYSTEM__RELABELFROM, NULL);
457 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
458 FILESYSTEM__ASSOCIATE, NULL);
462 static int selinux_is_genfs_special_handling(struct super_block *sb)
464 /* Special handling. Genfs but also in-core setxattr handler */
465 return !strcmp(sb->s_type->name, "sysfs") ||
466 !strcmp(sb->s_type->name, "pstore") ||
467 !strcmp(sb->s_type->name, "debugfs") ||
468 !strcmp(sb->s_type->name, "tracefs") ||
469 !strcmp(sb->s_type->name, "rootfs") ||
470 (selinux_policycap_cgroupseclabel() &&
471 (!strcmp(sb->s_type->name, "cgroup") ||
472 !strcmp(sb->s_type->name, "cgroup2")));
475 static int selinux_is_sblabel_mnt(struct super_block *sb)
477 struct superblock_security_struct *sbsec = selinux_superblock(sb);
480 * IMPORTANT: Double-check logic in this function when adding a new
481 * SECURITY_FS_USE_* definition!
483 BUILD_BUG_ON(SECURITY_FS_USE_MAX != 7);
485 switch (sbsec->behavior) {
486 case SECURITY_FS_USE_XATTR:
487 case SECURITY_FS_USE_TRANS:
488 case SECURITY_FS_USE_TASK:
489 case SECURITY_FS_USE_NATIVE:
492 case SECURITY_FS_USE_GENFS:
493 return selinux_is_genfs_special_handling(sb);
495 /* Never allow relabeling on context mounts */
496 case SECURITY_FS_USE_MNTPOINT:
497 case SECURITY_FS_USE_NONE:
503 static int sb_check_xattr_support(struct super_block *sb)
505 struct superblock_security_struct *sbsec = selinux_superblock(sb);
506 struct dentry *root = sb->s_root;
507 struct inode *root_inode = d_backing_inode(root);
512 * Make sure that the xattr handler exists and that no
513 * error other than -ENODATA is returned by getxattr on
514 * the root directory. -ENODATA is ok, as this may be
515 * the first boot of the SELinux kernel before we have
516 * assigned xattr values to the filesystem.
518 if (!(root_inode->i_opflags & IOP_XATTR)) {
519 pr_warn("SELinux: (dev %s, type %s) has no xattr support\n",
520 sb->s_id, sb->s_type->name);
524 rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
525 if (rc < 0 && rc != -ENODATA) {
526 if (rc == -EOPNOTSUPP) {
527 pr_warn("SELinux: (dev %s, type %s) has no security xattr handler\n",
528 sb->s_id, sb->s_type->name);
531 pr_warn("SELinux: (dev %s, type %s) getxattr errno %d\n",
532 sb->s_id, sb->s_type->name, -rc);
539 /* No xattr support - try to fallback to genfs if possible. */
540 rc = security_genfs_sid(sb->s_type->name, "/",
545 pr_warn("SELinux: (dev %s, type %s) falling back to genfs\n",
546 sb->s_id, sb->s_type->name);
547 sbsec->behavior = SECURITY_FS_USE_GENFS;
552 static int sb_finish_set_opts(struct super_block *sb)
554 struct superblock_security_struct *sbsec = selinux_superblock(sb);
555 struct dentry *root = sb->s_root;
556 struct inode *root_inode = d_backing_inode(root);
559 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
560 rc = sb_check_xattr_support(sb);
565 sbsec->flags |= SE_SBINITIALIZED;
568 * Explicitly set or clear SBLABEL_MNT. It's not sufficient to simply
569 * leave the flag untouched because sb_clone_mnt_opts might be handing
570 * us a superblock that needs the flag to be cleared.
572 if (selinux_is_sblabel_mnt(sb))
573 sbsec->flags |= SBLABEL_MNT;
575 sbsec->flags &= ~SBLABEL_MNT;
577 /* Initialize the root inode. */
578 rc = inode_doinit_with_dentry(root_inode, root);
580 /* Initialize any other inodes associated with the superblock, e.g.
581 inodes created prior to initial policy load or inodes created
582 during get_sb by a pseudo filesystem that directly
584 spin_lock(&sbsec->isec_lock);
585 while (!list_empty(&sbsec->isec_head)) {
586 struct inode_security_struct *isec =
587 list_first_entry(&sbsec->isec_head,
588 struct inode_security_struct, list);
589 struct inode *inode = isec->inode;
590 list_del_init(&isec->list);
591 spin_unlock(&sbsec->isec_lock);
592 inode = igrab(inode);
594 if (!IS_PRIVATE(inode))
595 inode_doinit_with_dentry(inode, NULL);
598 spin_lock(&sbsec->isec_lock);
600 spin_unlock(&sbsec->isec_lock);
604 static int bad_option(struct superblock_security_struct *sbsec, char flag,
605 u32 old_sid, u32 new_sid)
607 char mnt_flags = sbsec->flags & SE_MNTMASK;
609 /* check if the old mount command had the same options */
610 if (sbsec->flags & SE_SBINITIALIZED)
611 if (!(sbsec->flags & flag) ||
612 (old_sid != new_sid))
615 /* check if we were passed the same options twice,
616 * aka someone passed context=a,context=b
618 if (!(sbsec->flags & SE_SBINITIALIZED))
619 if (mnt_flags & flag)
625 * Allow filesystems with binary mount data to explicitly set mount point
626 * labeling information.
628 static int selinux_set_mnt_opts(struct super_block *sb,
630 unsigned long kern_flags,
631 unsigned long *set_kern_flags)
633 const struct cred *cred = current_cred();
634 struct superblock_security_struct *sbsec = selinux_superblock(sb);
635 struct dentry *root = sb->s_root;
636 struct selinux_mnt_opts *opts = mnt_opts;
637 struct inode_security_struct *root_isec;
638 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
639 u32 defcontext_sid = 0;
643 * Specifying internal flags without providing a place to
644 * place the results is not allowed
646 if (kern_flags && !set_kern_flags)
649 mutex_lock(&sbsec->lock);
651 if (!selinux_initialized()) {
653 /* Defer initialization until selinux_complete_init,
654 after the initial policy is loaded and the security
655 server is ready to handle calls. */
656 if (kern_flags & SECURITY_LSM_NATIVE_LABELS) {
657 sbsec->flags |= SE_SBNATIVE;
658 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
663 pr_warn("SELinux: Unable to set superblock options "
664 "before the security server is initialized\n");
669 * Binary mount data FS will come through this function twice. Once
670 * from an explicit call and once from the generic calls from the vfs.
671 * Since the generic VFS calls will not contain any security mount data
672 * we need to skip the double mount verification.
674 * This does open a hole in which we will not notice if the first
675 * mount using this sb set explicit options and a second mount using
676 * this sb does not set any security options. (The first options
677 * will be used for both mounts)
679 if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
683 root_isec = backing_inode_security_novalidate(root);
686 * parse the mount options, check if they are valid sids.
687 * also check if someone is trying to mount the same sb more
688 * than once with different security options.
691 if (opts->fscontext_sid) {
692 fscontext_sid = opts->fscontext_sid;
693 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
695 goto out_double_mount;
696 sbsec->flags |= FSCONTEXT_MNT;
698 if (opts->context_sid) {
699 context_sid = opts->context_sid;
700 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
702 goto out_double_mount;
703 sbsec->flags |= CONTEXT_MNT;
705 if (opts->rootcontext_sid) {
706 rootcontext_sid = opts->rootcontext_sid;
707 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
709 goto out_double_mount;
710 sbsec->flags |= ROOTCONTEXT_MNT;
712 if (opts->defcontext_sid) {
713 defcontext_sid = opts->defcontext_sid;
714 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
716 goto out_double_mount;
717 sbsec->flags |= DEFCONTEXT_MNT;
721 if (sbsec->flags & SE_SBINITIALIZED) {
722 /* previously mounted with options, but not on this attempt? */
723 if ((sbsec->flags & SE_MNTMASK) && !opts)
724 goto out_double_mount;
729 if (strcmp(sb->s_type->name, "proc") == 0)
730 sbsec->flags |= SE_SBPROC | SE_SBGENFS;
732 if (!strcmp(sb->s_type->name, "debugfs") ||
733 !strcmp(sb->s_type->name, "tracefs") ||
734 !strcmp(sb->s_type->name, "binder") ||
735 !strcmp(sb->s_type->name, "bpf") ||
736 !strcmp(sb->s_type->name, "pstore") ||
737 !strcmp(sb->s_type->name, "securityfs"))
738 sbsec->flags |= SE_SBGENFS;
740 if (!strcmp(sb->s_type->name, "sysfs") ||
741 !strcmp(sb->s_type->name, "cgroup") ||
742 !strcmp(sb->s_type->name, "cgroup2"))
743 sbsec->flags |= SE_SBGENFS | SE_SBGENFS_XATTR;
745 if (!sbsec->behavior) {
747 * Determine the labeling behavior to use for this
750 rc = security_fs_use(sb);
752 pr_warn("%s: security_fs_use(%s) returned %d\n",
753 __func__, sb->s_type->name, rc);
759 * If this is a user namespace mount and the filesystem type is not
760 * explicitly whitelisted, then no contexts are allowed on the command
761 * line and security labels must be ignored.
763 if (sb->s_user_ns != &init_user_ns &&
764 strcmp(sb->s_type->name, "tmpfs") &&
765 strcmp(sb->s_type->name, "ramfs") &&
766 strcmp(sb->s_type->name, "devpts") &&
767 strcmp(sb->s_type->name, "overlay")) {
768 if (context_sid || fscontext_sid || rootcontext_sid ||
773 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
774 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
775 rc = security_transition_sid(current_sid(),
778 &sbsec->mntpoint_sid);
785 /* sets the context of the superblock for the fs being mounted. */
787 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
791 sbsec->sid = fscontext_sid;
795 * Switch to using mount point labeling behavior.
796 * sets the label used on all file below the mountpoint, and will set
797 * the superblock context if not already set.
799 if (sbsec->flags & SE_SBNATIVE) {
801 * This means we are initializing a superblock that has been
802 * mounted before the SELinux was initialized and the
803 * filesystem requested native labeling. We had already
804 * returned SECURITY_LSM_NATIVE_LABELS in *set_kern_flags
805 * in the original mount attempt, so now we just need to set
806 * the SECURITY_FS_USE_NATIVE behavior.
808 sbsec->behavior = SECURITY_FS_USE_NATIVE;
809 } else if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) {
810 sbsec->behavior = SECURITY_FS_USE_NATIVE;
811 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
815 if (!fscontext_sid) {
816 rc = may_context_mount_sb_relabel(context_sid, sbsec,
820 sbsec->sid = context_sid;
822 rc = may_context_mount_inode_relabel(context_sid, sbsec,
827 if (!rootcontext_sid)
828 rootcontext_sid = context_sid;
830 sbsec->mntpoint_sid = context_sid;
831 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
834 if (rootcontext_sid) {
835 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
840 root_isec->sid = rootcontext_sid;
841 root_isec->initialized = LABEL_INITIALIZED;
844 if (defcontext_sid) {
845 if (sbsec->behavior != SECURITY_FS_USE_XATTR &&
846 sbsec->behavior != SECURITY_FS_USE_NATIVE) {
848 pr_warn("SELinux: defcontext option is "
849 "invalid for this filesystem type\n");
853 if (defcontext_sid != sbsec->def_sid) {
854 rc = may_context_mount_inode_relabel(defcontext_sid,
860 sbsec->def_sid = defcontext_sid;
864 rc = sb_finish_set_opts(sb);
866 mutex_unlock(&sbsec->lock);
870 pr_warn("SELinux: mount invalid. Same superblock, different "
871 "security settings for (dev %s, type %s)\n", sb->s_id,
876 static int selinux_cmp_sb_context(const struct super_block *oldsb,
877 const struct super_block *newsb)
879 struct superblock_security_struct *old = selinux_superblock(oldsb);
880 struct superblock_security_struct *new = selinux_superblock(newsb);
881 char oldflags = old->flags & SE_MNTMASK;
882 char newflags = new->flags & SE_MNTMASK;
884 if (oldflags != newflags)
886 if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid)
888 if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid)
890 if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid)
892 if (oldflags & ROOTCONTEXT_MNT) {
893 struct inode_security_struct *oldroot = backing_inode_security(oldsb->s_root);
894 struct inode_security_struct *newroot = backing_inode_security(newsb->s_root);
895 if (oldroot->sid != newroot->sid)
900 pr_warn("SELinux: mount invalid. Same superblock, "
901 "different security settings for (dev %s, "
902 "type %s)\n", newsb->s_id, newsb->s_type->name);
906 static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
907 struct super_block *newsb,
908 unsigned long kern_flags,
909 unsigned long *set_kern_flags)
912 const struct superblock_security_struct *oldsbsec =
913 selinux_superblock(oldsb);
914 struct superblock_security_struct *newsbsec = selinux_superblock(newsb);
916 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
917 int set_context = (oldsbsec->flags & CONTEXT_MNT);
918 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
921 * Specifying internal flags without providing a place to
922 * place the results is not allowed.
924 if (kern_flags && !set_kern_flags)
927 mutex_lock(&newsbsec->lock);
930 * if the parent was able to be mounted it clearly had no special lsm
931 * mount options. thus we can safely deal with this superblock later
933 if (!selinux_initialized()) {
934 if (kern_flags & SECURITY_LSM_NATIVE_LABELS) {
935 newsbsec->flags |= SE_SBNATIVE;
936 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
941 /* how can we clone if the old one wasn't set up?? */
942 BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
944 /* if fs is reusing a sb, make sure that the contexts match */
945 if (newsbsec->flags & SE_SBINITIALIZED) {
946 mutex_unlock(&newsbsec->lock);
947 if ((kern_flags & SECURITY_LSM_NATIVE_LABELS) && !set_context)
948 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
949 return selinux_cmp_sb_context(oldsb, newsb);
952 newsbsec->flags = oldsbsec->flags;
954 newsbsec->sid = oldsbsec->sid;
955 newsbsec->def_sid = oldsbsec->def_sid;
956 newsbsec->behavior = oldsbsec->behavior;
958 if (newsbsec->behavior == SECURITY_FS_USE_NATIVE &&
959 !(kern_flags & SECURITY_LSM_NATIVE_LABELS) && !set_context) {
960 rc = security_fs_use(newsb);
965 if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !set_context) {
966 newsbsec->behavior = SECURITY_FS_USE_NATIVE;
967 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
971 u32 sid = oldsbsec->mntpoint_sid;
975 if (!set_rootcontext) {
976 struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
979 newsbsec->mntpoint_sid = sid;
981 if (set_rootcontext) {
982 const struct inode_security_struct *oldisec = backing_inode_security(oldsb->s_root);
983 struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
985 newisec->sid = oldisec->sid;
988 sb_finish_set_opts(newsb);
990 mutex_unlock(&newsbsec->lock);
995 * NOTE: the caller is responsible for freeing the memory even if on error.
997 static int selinux_add_opt(int token, const char *s, void **mnt_opts)
999 struct selinux_mnt_opts *opts = *mnt_opts;
1003 if (token == Opt_seclabel)
1004 /* eaten and completely ignored */
1009 if (!selinux_initialized()) {
1010 pr_warn("SELinux: Unable to set superblock options before the security server is initialized\n");
1015 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1023 if (opts->context_sid || opts->defcontext_sid)
1025 dst_sid = &opts->context_sid;
1028 if (opts->fscontext_sid)
1030 dst_sid = &opts->fscontext_sid;
1032 case Opt_rootcontext:
1033 if (opts->rootcontext_sid)
1035 dst_sid = &opts->rootcontext_sid;
1037 case Opt_defcontext:
1038 if (opts->context_sid || opts->defcontext_sid)
1040 dst_sid = &opts->defcontext_sid;
1046 rc = security_context_str_to_sid(s, dst_sid, GFP_KERNEL);
1048 pr_warn("SELinux: security_context_str_to_sid (%s) failed with errno=%d\n",
1053 pr_warn(SEL_MOUNT_FAIL_MSG);
1057 static int show_sid(struct seq_file *m, u32 sid)
1059 char *context = NULL;
1063 rc = security_sid_to_context(sid, &context, &len);
1065 bool has_comma = strchr(context, ',');
1070 seq_escape(m, context, "\"\n\\");
1078 static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
1080 struct superblock_security_struct *sbsec = selinux_superblock(sb);
1083 if (!(sbsec->flags & SE_SBINITIALIZED))
1086 if (!selinux_initialized())
1089 if (sbsec->flags & FSCONTEXT_MNT) {
1091 seq_puts(m, FSCONTEXT_STR);
1092 rc = show_sid(m, sbsec->sid);
1096 if (sbsec->flags & CONTEXT_MNT) {
1098 seq_puts(m, CONTEXT_STR);
1099 rc = show_sid(m, sbsec->mntpoint_sid);
1103 if (sbsec->flags & DEFCONTEXT_MNT) {
1105 seq_puts(m, DEFCONTEXT_STR);
1106 rc = show_sid(m, sbsec->def_sid);
1110 if (sbsec->flags & ROOTCONTEXT_MNT) {
1111 struct dentry *root = sb->s_root;
1112 struct inode_security_struct *isec = backing_inode_security(root);
1114 seq_puts(m, ROOTCONTEXT_STR);
1115 rc = show_sid(m, isec->sid);
1119 if (sbsec->flags & SBLABEL_MNT) {
1121 seq_puts(m, SECLABEL_STR);
1126 static inline u16 inode_mode_to_security_class(umode_t mode)
1128 switch (mode & S_IFMT) {
1130 return SECCLASS_SOCK_FILE;
1132 return SECCLASS_LNK_FILE;
1134 return SECCLASS_FILE;
1136 return SECCLASS_BLK_FILE;
1138 return SECCLASS_DIR;
1140 return SECCLASS_CHR_FILE;
1142 return SECCLASS_FIFO_FILE;
1146 return SECCLASS_FILE;
1149 static inline int default_protocol_stream(int protocol)
1151 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP ||
1152 protocol == IPPROTO_MPTCP);
1155 static inline int default_protocol_dgram(int protocol)
1157 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1160 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1162 bool extsockclass = selinux_policycap_extsockclass();
1168 case SOCK_SEQPACKET:
1169 return SECCLASS_UNIX_STREAM_SOCKET;
1172 return SECCLASS_UNIX_DGRAM_SOCKET;
1179 case SOCK_SEQPACKET:
1180 if (default_protocol_stream(protocol))
1181 return SECCLASS_TCP_SOCKET;
1182 else if (extsockclass && protocol == IPPROTO_SCTP)
1183 return SECCLASS_SCTP_SOCKET;
1185 return SECCLASS_RAWIP_SOCKET;
1187 if (default_protocol_dgram(protocol))
1188 return SECCLASS_UDP_SOCKET;
1189 else if (extsockclass && (protocol == IPPROTO_ICMP ||
1190 protocol == IPPROTO_ICMPV6))
1191 return SECCLASS_ICMP_SOCKET;
1193 return SECCLASS_RAWIP_SOCKET;
1195 return SECCLASS_DCCP_SOCKET;
1197 return SECCLASS_RAWIP_SOCKET;
1203 return SECCLASS_NETLINK_ROUTE_SOCKET;
1204 case NETLINK_SOCK_DIAG:
1205 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1207 return SECCLASS_NETLINK_NFLOG_SOCKET;
1209 return SECCLASS_NETLINK_XFRM_SOCKET;
1210 case NETLINK_SELINUX:
1211 return SECCLASS_NETLINK_SELINUX_SOCKET;
1213 return SECCLASS_NETLINK_ISCSI_SOCKET;
1215 return SECCLASS_NETLINK_AUDIT_SOCKET;
1216 case NETLINK_FIB_LOOKUP:
1217 return SECCLASS_NETLINK_FIB_LOOKUP_SOCKET;
1218 case NETLINK_CONNECTOR:
1219 return SECCLASS_NETLINK_CONNECTOR_SOCKET;
1220 case NETLINK_NETFILTER:
1221 return SECCLASS_NETLINK_NETFILTER_SOCKET;
1222 case NETLINK_DNRTMSG:
1223 return SECCLASS_NETLINK_DNRT_SOCKET;
1224 case NETLINK_KOBJECT_UEVENT:
1225 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
1226 case NETLINK_GENERIC:
1227 return SECCLASS_NETLINK_GENERIC_SOCKET;
1228 case NETLINK_SCSITRANSPORT:
1229 return SECCLASS_NETLINK_SCSITRANSPORT_SOCKET;
1231 return SECCLASS_NETLINK_RDMA_SOCKET;
1232 case NETLINK_CRYPTO:
1233 return SECCLASS_NETLINK_CRYPTO_SOCKET;
1235 return SECCLASS_NETLINK_SOCKET;
1238 return SECCLASS_PACKET_SOCKET;
1240 return SECCLASS_KEY_SOCKET;
1242 return SECCLASS_APPLETALK_SOCKET;
1248 return SECCLASS_AX25_SOCKET;
1250 return SECCLASS_IPX_SOCKET;
1252 return SECCLASS_NETROM_SOCKET;
1254 return SECCLASS_ATMPVC_SOCKET;
1256 return SECCLASS_X25_SOCKET;
1258 return SECCLASS_ROSE_SOCKET;
1260 return SECCLASS_DECNET_SOCKET;
1262 return SECCLASS_ATMSVC_SOCKET;
1264 return SECCLASS_RDS_SOCKET;
1266 return SECCLASS_IRDA_SOCKET;
1268 return SECCLASS_PPPOX_SOCKET;
1270 return SECCLASS_LLC_SOCKET;
1272 return SECCLASS_CAN_SOCKET;
1274 return SECCLASS_TIPC_SOCKET;
1276 return SECCLASS_BLUETOOTH_SOCKET;
1278 return SECCLASS_IUCV_SOCKET;
1280 return SECCLASS_RXRPC_SOCKET;
1282 return SECCLASS_ISDN_SOCKET;
1284 return SECCLASS_PHONET_SOCKET;
1286 return SECCLASS_IEEE802154_SOCKET;
1288 return SECCLASS_CAIF_SOCKET;
1290 return SECCLASS_ALG_SOCKET;
1292 return SECCLASS_NFC_SOCKET;
1294 return SECCLASS_VSOCK_SOCKET;
1296 return SECCLASS_KCM_SOCKET;
1298 return SECCLASS_QIPCRTR_SOCKET;
1300 return SECCLASS_SMC_SOCKET;
1302 return SECCLASS_XDP_SOCKET;
1304 return SECCLASS_MCTP_SOCKET;
1306 #error New address family defined, please update this function.
1311 return SECCLASS_SOCKET;
1314 static int selinux_genfs_get_sid(struct dentry *dentry,
1320 struct super_block *sb = dentry->d_sb;
1321 char *buffer, *path;
1323 buffer = (char *)__get_free_page(GFP_KERNEL);
1327 path = dentry_path_raw(dentry, buffer, PAGE_SIZE);
1331 if (flags & SE_SBPROC) {
1332 /* each process gets a /proc/PID/ entry. Strip off the
1333 * PID part to get a valid selinux labeling.
1334 * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */
1335 while (path[1] >= '0' && path[1] <= '9') {
1340 rc = security_genfs_sid(sb->s_type->name,
1342 if (rc == -ENOENT) {
1343 /* No match in policy, mark as unlabeled. */
1344 *sid = SECINITSID_UNLABELED;
1348 free_page((unsigned long)buffer);
1352 static int inode_doinit_use_xattr(struct inode *inode, struct dentry *dentry,
1353 u32 def_sid, u32 *sid)
1355 #define INITCONTEXTLEN 255
1360 len = INITCONTEXTLEN;
1361 context = kmalloc(len + 1, GFP_NOFS);
1365 context[len] = '\0';
1366 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
1367 if (rc == -ERANGE) {
1370 /* Need a larger buffer. Query for the right size. */
1371 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, NULL, 0);
1376 context = kmalloc(len + 1, GFP_NOFS);
1380 context[len] = '\0';
1381 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX,
1386 if (rc != -ENODATA) {
1387 pr_warn("SELinux: %s: getxattr returned %d for dev=%s ino=%ld\n",
1388 __func__, -rc, inode->i_sb->s_id, inode->i_ino);
1395 rc = security_context_to_sid_default(context, rc, sid,
1398 char *dev = inode->i_sb->s_id;
1399 unsigned long ino = inode->i_ino;
1401 if (rc == -EINVAL) {
1402 pr_notice_ratelimited("SELinux: inode=%lu on dev=%s was found to have an invalid context=%s. This indicates you may need to relabel the inode or the filesystem in question.\n",
1405 pr_warn("SELinux: %s: context_to_sid(%s) returned %d for dev=%s ino=%ld\n",
1406 __func__, context, -rc, dev, ino);
1413 /* The inode's security attributes must be initialized before first use. */
1414 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1416 struct superblock_security_struct *sbsec = NULL;
1417 struct inode_security_struct *isec = selinux_inode(inode);
1418 u32 task_sid, sid = 0;
1420 struct dentry *dentry;
1423 if (isec->initialized == LABEL_INITIALIZED)
1426 spin_lock(&isec->lock);
1427 if (isec->initialized == LABEL_INITIALIZED)
1430 if (isec->sclass == SECCLASS_FILE)
1431 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1433 sbsec = selinux_superblock(inode->i_sb);
1434 if (!(sbsec->flags & SE_SBINITIALIZED)) {
1435 /* Defer initialization until selinux_complete_init,
1436 after the initial policy is loaded and the security
1437 server is ready to handle calls. */
1438 spin_lock(&sbsec->isec_lock);
1439 if (list_empty(&isec->list))
1440 list_add(&isec->list, &sbsec->isec_head);
1441 spin_unlock(&sbsec->isec_lock);
1445 sclass = isec->sclass;
1446 task_sid = isec->task_sid;
1448 isec->initialized = LABEL_PENDING;
1449 spin_unlock(&isec->lock);
1451 switch (sbsec->behavior) {
1453 * In case of SECURITY_FS_USE_NATIVE we need to re-fetch the labels
1454 * via xattr when called from delayed_superblock_init().
1456 case SECURITY_FS_USE_NATIVE:
1457 case SECURITY_FS_USE_XATTR:
1458 if (!(inode->i_opflags & IOP_XATTR)) {
1459 sid = sbsec->def_sid;
1462 /* Need a dentry, since the xattr API requires one.
1463 Life would be simpler if we could just pass the inode. */
1465 /* Called from d_instantiate or d_splice_alias. */
1466 dentry = dget(opt_dentry);
1469 * Called from selinux_complete_init, try to find a dentry.
1470 * Some filesystems really want a connected one, so try
1471 * that first. We could split SECURITY_FS_USE_XATTR in
1472 * two, depending upon that...
1474 dentry = d_find_alias(inode);
1476 dentry = d_find_any_alias(inode);
1480 * this is can be hit on boot when a file is accessed
1481 * before the policy is loaded. When we load policy we
1482 * may find inodes that have no dentry on the
1483 * sbsec->isec_head list. No reason to complain as these
1484 * will get fixed up the next time we go through
1485 * inode_doinit with a dentry, before these inodes could
1486 * be used again by userspace.
1491 rc = inode_doinit_use_xattr(inode, dentry, sbsec->def_sid,
1497 case SECURITY_FS_USE_TASK:
1500 case SECURITY_FS_USE_TRANS:
1501 /* Default to the fs SID. */
1504 /* Try to obtain a transition SID. */
1505 rc = security_transition_sid(task_sid, sid,
1506 sclass, NULL, &sid);
1510 case SECURITY_FS_USE_MNTPOINT:
1511 sid = sbsec->mntpoint_sid;
1514 /* Default to the fs superblock SID. */
1517 if ((sbsec->flags & SE_SBGENFS) &&
1518 (!S_ISLNK(inode->i_mode) ||
1519 selinux_policycap_genfs_seclabel_symlinks())) {
1520 /* We must have a dentry to determine the label on
1523 /* Called from d_instantiate or
1524 * d_splice_alias. */
1525 dentry = dget(opt_dentry);
1527 /* Called from selinux_complete_init, try to
1528 * find a dentry. Some filesystems really want
1529 * a connected one, so try that first.
1531 dentry = d_find_alias(inode);
1533 dentry = d_find_any_alias(inode);
1536 * This can be hit on boot when a file is accessed
1537 * before the policy is loaded. When we load policy we
1538 * may find inodes that have no dentry on the
1539 * sbsec->isec_head list. No reason to complain as
1540 * these will get fixed up the next time we go through
1541 * inode_doinit() with a dentry, before these inodes
1542 * could be used again by userspace.
1546 rc = selinux_genfs_get_sid(dentry, sclass,
1547 sbsec->flags, &sid);
1553 if ((sbsec->flags & SE_SBGENFS_XATTR) &&
1554 (inode->i_opflags & IOP_XATTR)) {
1555 rc = inode_doinit_use_xattr(inode, dentry,
1568 spin_lock(&isec->lock);
1569 if (isec->initialized == LABEL_PENDING) {
1571 isec->initialized = LABEL_INVALID;
1574 isec->initialized = LABEL_INITIALIZED;
1579 spin_unlock(&isec->lock);
1583 spin_lock(&isec->lock);
1584 if (isec->initialized == LABEL_PENDING) {
1585 isec->initialized = LABEL_INVALID;
1588 spin_unlock(&isec->lock);
1592 /* Convert a Linux signal to an access vector. */
1593 static inline u32 signal_to_av(int sig)
1599 /* Commonly granted from child to parent. */
1600 perm = PROCESS__SIGCHLD;
1603 /* Cannot be caught or ignored */
1604 perm = PROCESS__SIGKILL;
1607 /* Cannot be caught or ignored */
1608 perm = PROCESS__SIGSTOP;
1611 /* All other signals. */
1612 perm = PROCESS__SIGNAL;
1619 #if CAP_LAST_CAP > 63
1620 #error Fix SELinux to handle capabilities > 63.
1623 /* Check whether a task is allowed to use a capability. */
1624 static int cred_has_capability(const struct cred *cred,
1625 int cap, unsigned int opts, bool initns)
1627 struct common_audit_data ad;
1628 struct av_decision avd;
1630 u32 sid = cred_sid(cred);
1631 u32 av = CAP_TO_MASK(cap);
1634 ad.type = LSM_AUDIT_DATA_CAP;
1637 switch (CAP_TO_INDEX(cap)) {
1639 sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
1642 sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
1645 pr_err("SELinux: out of range capability %d\n", cap);
1650 rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
1651 if (!(opts & CAP_OPT_NOAUDIT)) {
1652 int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad);
1659 /* Check whether a task has a particular permission to an inode.
1660 The 'adp' parameter is optional and allows other audit
1661 data to be passed (e.g. the dentry). */
1662 static int inode_has_perm(const struct cred *cred,
1663 struct inode *inode,
1665 struct common_audit_data *adp)
1667 struct inode_security_struct *isec;
1670 if (unlikely(IS_PRIVATE(inode)))
1673 sid = cred_sid(cred);
1674 isec = selinux_inode(inode);
1676 return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
1679 /* Same as inode_has_perm, but pass explicit audit data containing
1680 the dentry to help the auditing code to more easily generate the
1681 pathname if needed. */
1682 static inline int dentry_has_perm(const struct cred *cred,
1683 struct dentry *dentry,
1686 struct inode *inode = d_backing_inode(dentry);
1687 struct common_audit_data ad;
1689 ad.type = LSM_AUDIT_DATA_DENTRY;
1690 ad.u.dentry = dentry;
1691 __inode_security_revalidate(inode, dentry, true);
1692 return inode_has_perm(cred, inode, av, &ad);
1695 /* Same as inode_has_perm, but pass explicit audit data containing
1696 the path to help the auditing code to more easily generate the
1697 pathname if needed. */
1698 static inline int path_has_perm(const struct cred *cred,
1699 const struct path *path,
1702 struct inode *inode = d_backing_inode(path->dentry);
1703 struct common_audit_data ad;
1705 ad.type = LSM_AUDIT_DATA_PATH;
1707 __inode_security_revalidate(inode, path->dentry, true);
1708 return inode_has_perm(cred, inode, av, &ad);
1711 /* Same as path_has_perm, but uses the inode from the file struct. */
1712 static inline int file_path_has_perm(const struct cred *cred,
1716 struct common_audit_data ad;
1718 ad.type = LSM_AUDIT_DATA_FILE;
1720 return inode_has_perm(cred, file_inode(file), av, &ad);
1723 #ifdef CONFIG_BPF_SYSCALL
1724 static int bpf_fd_pass(const struct file *file, u32 sid);
1727 /* Check whether a task can use an open file descriptor to
1728 access an inode in a given way. Check access to the
1729 descriptor itself, and then use dentry_has_perm to
1730 check a particular permission to the file.
1731 Access to the descriptor is implicitly granted if it
1732 has the same SID as the process. If av is zero, then
1733 access to the file is not checked, e.g. for cases
1734 where only the descriptor is affected like seek. */
1735 static int file_has_perm(const struct cred *cred,
1739 struct file_security_struct *fsec = selinux_file(file);
1740 struct inode *inode = file_inode(file);
1741 struct common_audit_data ad;
1742 u32 sid = cred_sid(cred);
1745 ad.type = LSM_AUDIT_DATA_FILE;
1748 if (sid != fsec->sid) {
1749 rc = avc_has_perm(sid, fsec->sid,
1757 #ifdef CONFIG_BPF_SYSCALL
1758 rc = bpf_fd_pass(file, cred_sid(cred));
1763 /* av is zero if only checking access to the descriptor. */
1766 rc = inode_has_perm(cred, inode, av, &ad);
1773 * Determine the label for an inode that might be unioned.
1776 selinux_determine_inode_label(const struct task_security_struct *tsec,
1778 const struct qstr *name, u16 tclass,
1781 const struct superblock_security_struct *sbsec =
1782 selinux_superblock(dir->i_sb);
1784 if ((sbsec->flags & SE_SBINITIALIZED) &&
1785 (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) {
1786 *_new_isid = sbsec->mntpoint_sid;
1787 } else if ((sbsec->flags & SBLABEL_MNT) &&
1789 *_new_isid = tsec->create_sid;
1791 const struct inode_security_struct *dsec = inode_security(dir);
1792 return security_transition_sid(tsec->sid,
1800 /* Check whether a task can create a file. */
1801 static int may_create(struct inode *dir,
1802 struct dentry *dentry,
1805 const struct task_security_struct *tsec = selinux_cred(current_cred());
1806 struct inode_security_struct *dsec;
1807 struct superblock_security_struct *sbsec;
1809 struct common_audit_data ad;
1812 dsec = inode_security(dir);
1813 sbsec = selinux_superblock(dir->i_sb);
1817 ad.type = LSM_AUDIT_DATA_DENTRY;
1818 ad.u.dentry = dentry;
1820 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
1821 DIR__ADD_NAME | DIR__SEARCH,
1826 rc = selinux_determine_inode_label(tsec, dir, &dentry->d_name, tclass,
1831 rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
1835 return avc_has_perm(newsid, sbsec->sid,
1836 SECCLASS_FILESYSTEM,
1837 FILESYSTEM__ASSOCIATE, &ad);
1841 #define MAY_UNLINK 1
1844 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1845 static int may_link(struct inode *dir,
1846 struct dentry *dentry,
1850 struct inode_security_struct *dsec, *isec;
1851 struct common_audit_data ad;
1852 u32 sid = current_sid();
1856 dsec = inode_security(dir);
1857 isec = backing_inode_security(dentry);
1859 ad.type = LSM_AUDIT_DATA_DENTRY;
1860 ad.u.dentry = dentry;
1863 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1864 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
1879 pr_warn("SELinux: %s: unrecognized kind %d\n",
1884 rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
1888 static inline int may_rename(struct inode *old_dir,
1889 struct dentry *old_dentry,
1890 struct inode *new_dir,
1891 struct dentry *new_dentry)
1893 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1894 struct common_audit_data ad;
1895 u32 sid = current_sid();
1897 int old_is_dir, new_is_dir;
1900 old_dsec = inode_security(old_dir);
1901 old_isec = backing_inode_security(old_dentry);
1902 old_is_dir = d_is_dir(old_dentry);
1903 new_dsec = inode_security(new_dir);
1905 ad.type = LSM_AUDIT_DATA_DENTRY;
1907 ad.u.dentry = old_dentry;
1908 rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
1909 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1912 rc = avc_has_perm(sid, old_isec->sid,
1913 old_isec->sclass, FILE__RENAME, &ad);
1916 if (old_is_dir && new_dir != old_dir) {
1917 rc = avc_has_perm(sid, old_isec->sid,
1918 old_isec->sclass, DIR__REPARENT, &ad);
1923 ad.u.dentry = new_dentry;
1924 av = DIR__ADD_NAME | DIR__SEARCH;
1925 if (d_is_positive(new_dentry))
1926 av |= DIR__REMOVE_NAME;
1927 rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1930 if (d_is_positive(new_dentry)) {
1931 new_isec = backing_inode_security(new_dentry);
1932 new_is_dir = d_is_dir(new_dentry);
1933 rc = avc_has_perm(sid, new_isec->sid,
1935 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1943 /* Check whether a task can perform a filesystem operation. */
1944 static int superblock_has_perm(const struct cred *cred,
1945 const struct super_block *sb,
1947 struct common_audit_data *ad)
1949 struct superblock_security_struct *sbsec;
1950 u32 sid = cred_sid(cred);
1952 sbsec = selinux_superblock(sb);
1953 return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
1956 /* Convert a Linux mode and permission mask to an access vector. */
1957 static inline u32 file_mask_to_av(int mode, int mask)
1961 if (!S_ISDIR(mode)) {
1962 if (mask & MAY_EXEC)
1963 av |= FILE__EXECUTE;
1964 if (mask & MAY_READ)
1967 if (mask & MAY_APPEND)
1969 else if (mask & MAY_WRITE)
1973 if (mask & MAY_EXEC)
1975 if (mask & MAY_WRITE)
1977 if (mask & MAY_READ)
1984 /* Convert a Linux file to an access vector. */
1985 static inline u32 file_to_av(const struct file *file)
1989 if (file->f_mode & FMODE_READ)
1991 if (file->f_mode & FMODE_WRITE) {
1992 if (file->f_flags & O_APPEND)
1999 * Special file opened with flags 3 for ioctl-only use.
2008 * Convert a file to an access vector and include the correct
2011 static inline u32 open_file_to_av(struct file *file)
2013 u32 av = file_to_av(file);
2014 struct inode *inode = file_inode(file);
2016 if (selinux_policycap_openperm() &&
2017 inode->i_sb->s_magic != SOCKFS_MAGIC)
2023 /* Hook functions begin here. */
2025 static int selinux_binder_set_context_mgr(const struct cred *mgr)
2027 return avc_has_perm(current_sid(), cred_sid(mgr), SECCLASS_BINDER,
2028 BINDER__SET_CONTEXT_MGR, NULL);
2031 static int selinux_binder_transaction(const struct cred *from,
2032 const struct cred *to)
2034 u32 mysid = current_sid();
2035 u32 fromsid = cred_sid(from);
2036 u32 tosid = cred_sid(to);
2039 if (mysid != fromsid) {
2040 rc = avc_has_perm(mysid, fromsid, SECCLASS_BINDER,
2041 BINDER__IMPERSONATE, NULL);
2046 return avc_has_perm(fromsid, tosid,
2047 SECCLASS_BINDER, BINDER__CALL, NULL);
2050 static int selinux_binder_transfer_binder(const struct cred *from,
2051 const struct cred *to)
2053 return avc_has_perm(cred_sid(from), cred_sid(to),
2054 SECCLASS_BINDER, BINDER__TRANSFER,
2058 static int selinux_binder_transfer_file(const struct cred *from,
2059 const struct cred *to,
2060 const struct file *file)
2062 u32 sid = cred_sid(to);
2063 struct file_security_struct *fsec = selinux_file(file);
2064 struct dentry *dentry = file->f_path.dentry;
2065 struct inode_security_struct *isec;
2066 struct common_audit_data ad;
2069 ad.type = LSM_AUDIT_DATA_PATH;
2070 ad.u.path = file->f_path;
2072 if (sid != fsec->sid) {
2073 rc = avc_has_perm(sid, fsec->sid,
2081 #ifdef CONFIG_BPF_SYSCALL
2082 rc = bpf_fd_pass(file, sid);
2087 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2090 isec = backing_inode_security(dentry);
2091 return avc_has_perm(sid, isec->sid, isec->sclass, file_to_av(file),
2095 static int selinux_ptrace_access_check(struct task_struct *child,
2098 u32 sid = current_sid();
2099 u32 csid = task_sid_obj(child);
2101 if (mode & PTRACE_MODE_READ)
2102 return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ,
2105 return avc_has_perm(sid, csid, SECCLASS_PROCESS, PROCESS__PTRACE,
2109 static int selinux_ptrace_traceme(struct task_struct *parent)
2111 return avc_has_perm(task_sid_obj(parent), task_sid_obj(current),
2112 SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
2115 static int selinux_capget(const struct task_struct *target, kernel_cap_t *effective,
2116 kernel_cap_t *inheritable, kernel_cap_t *permitted)
2118 return avc_has_perm(current_sid(), task_sid_obj(target),
2119 SECCLASS_PROCESS, PROCESS__GETCAP, NULL);
2122 static int selinux_capset(struct cred *new, const struct cred *old,
2123 const kernel_cap_t *effective,
2124 const kernel_cap_t *inheritable,
2125 const kernel_cap_t *permitted)
2127 return avc_has_perm(cred_sid(old), cred_sid(new), SECCLASS_PROCESS,
2128 PROCESS__SETCAP, NULL);
2132 * (This comment used to live with the selinux_task_setuid hook,
2133 * which was removed).
2135 * Since setuid only affects the current process, and since the SELinux
2136 * controls are not based on the Linux identity attributes, SELinux does not
2137 * need to control this operation. However, SELinux does control the use of
2138 * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
2141 static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
2142 int cap, unsigned int opts)
2144 return cred_has_capability(cred, cap, opts, ns == &init_user_ns);
2147 static int selinux_quotactl(int cmds, int type, int id, const struct super_block *sb)
2149 const struct cred *cred = current_cred();
2164 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
2172 case Q_XGETNEXTQUOTA:
2173 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
2176 rc = 0; /* let the kernel handle invalid cmds */
2182 static int selinux_quota_on(struct dentry *dentry)
2184 const struct cred *cred = current_cred();
2186 return dentry_has_perm(cred, dentry, FILE__QUOTAON);
2189 static int selinux_syslog(int type)
2192 case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */
2193 case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */
2194 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2195 SECCLASS_SYSTEM, SYSTEM__SYSLOG_READ, NULL);
2196 case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */
2197 case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */
2198 /* Set level of messages printed to console */
2199 case SYSLOG_ACTION_CONSOLE_LEVEL:
2200 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2201 SECCLASS_SYSTEM, SYSTEM__SYSLOG_CONSOLE,
2204 /* All other syslog types */
2205 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2206 SECCLASS_SYSTEM, SYSTEM__SYSLOG_MOD, NULL);
2210 * Check permission for allocating a new virtual mapping. Returns
2211 * 0 if permission is granted, negative error code if not.
2213 * Do not audit the selinux permission check, as this is applied to all
2214 * processes that allocate mappings.
2216 static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
2218 return cred_has_capability(current_cred(), CAP_SYS_ADMIN,
2219 CAP_OPT_NOAUDIT, true);
2222 /* binprm security operations */
2224 static u32 ptrace_parent_sid(void)
2227 struct task_struct *tracer;
2230 tracer = ptrace_parent(current);
2232 sid = task_sid_obj(tracer);
2238 static int check_nnp_nosuid(const struct linux_binprm *bprm,
2239 const struct task_security_struct *old_tsec,
2240 const struct task_security_struct *new_tsec)
2242 int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
2243 int nosuid = !mnt_may_suid(bprm->file->f_path.mnt);
2247 if (!nnp && !nosuid)
2248 return 0; /* neither NNP nor nosuid */
2250 if (new_tsec->sid == old_tsec->sid)
2251 return 0; /* No change in credentials */
2254 * If the policy enables the nnp_nosuid_transition policy capability,
2255 * then we permit transitions under NNP or nosuid if the
2256 * policy allows the corresponding permission between
2257 * the old and new contexts.
2259 if (selinux_policycap_nnp_nosuid_transition()) {
2262 av |= PROCESS2__NNP_TRANSITION;
2264 av |= PROCESS2__NOSUID_TRANSITION;
2265 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2266 SECCLASS_PROCESS2, av, NULL);
2272 * We also permit NNP or nosuid transitions to bounded SIDs,
2273 * i.e. SIDs that are guaranteed to only be allowed a subset
2274 * of the permissions of the current SID.
2276 rc = security_bounded_transition(old_tsec->sid,
2282 * On failure, preserve the errno values for NNP vs nosuid.
2283 * NNP: Operation not permitted for caller.
2284 * nosuid: Permission denied to file.
2291 static int selinux_bprm_creds_for_exec(struct linux_binprm *bprm)
2293 const struct task_security_struct *old_tsec;
2294 struct task_security_struct *new_tsec;
2295 struct inode_security_struct *isec;
2296 struct common_audit_data ad;
2297 struct inode *inode = file_inode(bprm->file);
2300 /* SELinux context only depends on initial program or script and not
2301 * the script interpreter */
2303 old_tsec = selinux_cred(current_cred());
2304 new_tsec = selinux_cred(bprm->cred);
2305 isec = inode_security(inode);
2307 /* Default to the current task SID. */
2308 new_tsec->sid = old_tsec->sid;
2309 new_tsec->osid = old_tsec->sid;
2311 /* Reset fs, key, and sock SIDs on execve. */
2312 new_tsec->create_sid = 0;
2313 new_tsec->keycreate_sid = 0;
2314 new_tsec->sockcreate_sid = 0;
2317 * Before policy is loaded, label any task outside kernel space
2318 * as SECINITSID_INIT, so that any userspace tasks surviving from
2319 * early boot end up with a label different from SECINITSID_KERNEL
2320 * (if the policy chooses to set SECINITSID_INIT != SECINITSID_KERNEL).
2322 if (!selinux_initialized()) {
2323 new_tsec->sid = SECINITSID_INIT;
2324 /* also clear the exec_sid just in case */
2325 new_tsec->exec_sid = 0;
2329 if (old_tsec->exec_sid) {
2330 new_tsec->sid = old_tsec->exec_sid;
2331 /* Reset exec SID on execve. */
2332 new_tsec->exec_sid = 0;
2334 /* Fail on NNP or nosuid if not an allowed transition. */
2335 rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
2339 /* Check for a default transition on this program. */
2340 rc = security_transition_sid(old_tsec->sid,
2341 isec->sid, SECCLASS_PROCESS, NULL,
2347 * Fallback to old SID on NNP or nosuid if not an allowed
2350 rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
2352 new_tsec->sid = old_tsec->sid;
2355 ad.type = LSM_AUDIT_DATA_FILE;
2356 ad.u.file = bprm->file;
2358 if (new_tsec->sid == old_tsec->sid) {
2359 rc = avc_has_perm(old_tsec->sid, isec->sid,
2360 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2364 /* Check permissions for the transition. */
2365 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2366 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2370 rc = avc_has_perm(new_tsec->sid, isec->sid,
2371 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2375 /* Check for shared state */
2376 if (bprm->unsafe & LSM_UNSAFE_SHARE) {
2377 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2378 SECCLASS_PROCESS, PROCESS__SHARE,
2384 /* Make sure that anyone attempting to ptrace over a task that
2385 * changes its SID has the appropriate permit */
2386 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
2387 u32 ptsid = ptrace_parent_sid();
2389 rc = avc_has_perm(ptsid, new_tsec->sid,
2391 PROCESS__PTRACE, NULL);
2397 /* Clear any possibly unsafe personality bits on exec: */
2398 bprm->per_clear |= PER_CLEAR_ON_SETID;
2400 /* Enable secure mode for SIDs transitions unless
2401 the noatsecure permission is granted between
2402 the two SIDs, i.e. ahp returns 0. */
2403 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2404 SECCLASS_PROCESS, PROCESS__NOATSECURE,
2406 bprm->secureexec |= !!rc;
2412 static int match_file(const void *p, struct file *file, unsigned fd)
2414 return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0;
2417 /* Derived from fs/exec.c:flush_old_files. */
2418 static inline void flush_unauthorized_files(const struct cred *cred,
2419 struct files_struct *files)
2421 struct file *file, *devnull = NULL;
2422 struct tty_struct *tty;
2426 tty = get_current_tty();
2428 spin_lock(&tty->files_lock);
2429 if (!list_empty(&tty->tty_files)) {
2430 struct tty_file_private *file_priv;
2432 /* Revalidate access to controlling tty.
2433 Use file_path_has_perm on the tty path directly
2434 rather than using file_has_perm, as this particular
2435 open file may belong to another process and we are
2436 only interested in the inode-based check here. */
2437 file_priv = list_first_entry(&tty->tty_files,
2438 struct tty_file_private, list);
2439 file = file_priv->file;
2440 if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE))
2443 spin_unlock(&tty->files_lock);
2446 /* Reset controlling tty. */
2450 /* Revalidate access to inherited open files. */
2451 n = iterate_fd(files, 0, match_file, cred);
2452 if (!n) /* none found? */
2455 devnull = dentry_open(&selinux_null, O_RDWR, cred);
2456 if (IS_ERR(devnull))
2458 /* replace all the matching ones with this */
2460 replace_fd(n - 1, devnull, 0);
2461 } while ((n = iterate_fd(files, n, match_file, cred)) != 0);
2467 * Prepare a process for imminent new credential changes due to exec
2469 static void selinux_bprm_committing_creds(const struct linux_binprm *bprm)
2471 struct task_security_struct *new_tsec;
2472 struct rlimit *rlim, *initrlim;
2475 new_tsec = selinux_cred(bprm->cred);
2476 if (new_tsec->sid == new_tsec->osid)
2479 /* Close files for which the new task SID is not authorized. */
2480 flush_unauthorized_files(bprm->cred, current->files);
2482 /* Always clear parent death signal on SID transitions. */
2483 current->pdeath_signal = 0;
2485 /* Check whether the new SID can inherit resource limits from the old
2486 * SID. If not, reset all soft limits to the lower of the current
2487 * task's hard limit and the init task's soft limit.
2489 * Note that the setting of hard limits (even to lower them) can be
2490 * controlled by the setrlimit check. The inclusion of the init task's
2491 * soft limit into the computation is to avoid resetting soft limits
2492 * higher than the default soft limit for cases where the default is
2493 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
2495 rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
2496 PROCESS__RLIMITINH, NULL);
2498 /* protect against do_prlimit() */
2500 for (i = 0; i < RLIM_NLIMITS; i++) {
2501 rlim = current->signal->rlim + i;
2502 initrlim = init_task.signal->rlim + i;
2503 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2505 task_unlock(current);
2506 if (IS_ENABLED(CONFIG_POSIX_TIMERS))
2507 update_rlimit_cpu(current, rlimit(RLIMIT_CPU));
2512 * Clean up the process immediately after the installation of new credentials
2515 static void selinux_bprm_committed_creds(const struct linux_binprm *bprm)
2517 const struct task_security_struct *tsec = selinux_cred(current_cred());
2527 /* Check whether the new SID can inherit signal state from the old SID.
2528 * If not, clear itimers to avoid subsequent signal generation and
2529 * flush and unblock signals.
2531 * This must occur _after_ the task SID has been updated so that any
2532 * kill done after the flush will be checked against the new SID.
2534 rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
2538 spin_lock_irq(&unrcu_pointer(current->sighand)->siglock);
2539 if (!fatal_signal_pending(current)) {
2540 flush_sigqueue(¤t->pending);
2541 flush_sigqueue(¤t->signal->shared_pending);
2542 flush_signal_handlers(current, 1);
2543 sigemptyset(¤t->blocked);
2544 recalc_sigpending();
2546 spin_unlock_irq(&unrcu_pointer(current->sighand)->siglock);
2549 /* Wake up the parent if it is waiting so that it can recheck
2550 * wait permission to the new task SID. */
2551 read_lock(&tasklist_lock);
2552 __wake_up_parent(current, unrcu_pointer(current->real_parent));
2553 read_unlock(&tasklist_lock);
2556 /* superblock security operations */
2558 static int selinux_sb_alloc_security(struct super_block *sb)
2560 struct superblock_security_struct *sbsec = selinux_superblock(sb);
2562 mutex_init(&sbsec->lock);
2563 INIT_LIST_HEAD(&sbsec->isec_head);
2564 spin_lock_init(&sbsec->isec_lock);
2565 sbsec->sid = SECINITSID_UNLABELED;
2566 sbsec->def_sid = SECINITSID_FILE;
2567 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
2572 static inline int opt_len(const char *s)
2574 bool open_quote = false;
2578 for (len = 0; (c = s[len]) != '\0'; len++) {
2580 open_quote = !open_quote;
2581 if (c == ',' && !open_quote)
2587 static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
2589 char *from = options;
2595 int len = opt_len(from);
2599 token = match_opt_prefix(from, len, &arg);
2601 if (token != Opt_error) {
2606 for (p = q = arg; p < from + len; p++) {
2611 arg = kmemdup_nul(arg, q - arg, GFP_KERNEL);
2617 rc = selinux_add_opt(token, arg, mnt_opts);
2624 if (!first) { // copy with preceding comma
2629 memmove(to, from, len);
2642 selinux_free_mnt_opts(*mnt_opts);
2648 static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
2650 struct selinux_mnt_opts *opts = mnt_opts;
2651 struct superblock_security_struct *sbsec = selinux_superblock(sb);
2654 * Superblock not initialized (i.e. no options) - reject if any
2655 * options specified, otherwise accept.
2657 if (!(sbsec->flags & SE_SBINITIALIZED))
2658 return opts ? 1 : 0;
2661 * Superblock initialized and no options specified - reject if
2662 * superblock has any options set, otherwise accept.
2665 return (sbsec->flags & SE_MNTMASK) ? 1 : 0;
2667 if (opts->fscontext_sid) {
2668 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
2669 opts->fscontext_sid))
2672 if (opts->context_sid) {
2673 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
2677 if (opts->rootcontext_sid) {
2678 struct inode_security_struct *root_isec;
2680 root_isec = backing_inode_security(sb->s_root);
2681 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
2682 opts->rootcontext_sid))
2685 if (opts->defcontext_sid) {
2686 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
2687 opts->defcontext_sid))
2693 static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
2695 struct selinux_mnt_opts *opts = mnt_opts;
2696 struct superblock_security_struct *sbsec = selinux_superblock(sb);
2698 if (!(sbsec->flags & SE_SBINITIALIZED))
2704 if (opts->fscontext_sid) {
2705 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
2706 opts->fscontext_sid))
2707 goto out_bad_option;
2709 if (opts->context_sid) {
2710 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
2712 goto out_bad_option;
2714 if (opts->rootcontext_sid) {
2715 struct inode_security_struct *root_isec;
2716 root_isec = backing_inode_security(sb->s_root);
2717 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
2718 opts->rootcontext_sid))
2719 goto out_bad_option;
2721 if (opts->defcontext_sid) {
2722 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
2723 opts->defcontext_sid))
2724 goto out_bad_option;
2729 pr_warn("SELinux: unable to change security options "
2730 "during remount (dev %s, type=%s)\n", sb->s_id,
2735 static int selinux_sb_kern_mount(const struct super_block *sb)
2737 const struct cred *cred = current_cred();
2738 struct common_audit_data ad;
2740 ad.type = LSM_AUDIT_DATA_DENTRY;
2741 ad.u.dentry = sb->s_root;
2742 return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
2745 static int selinux_sb_statfs(struct dentry *dentry)
2747 const struct cred *cred = current_cred();
2748 struct common_audit_data ad;
2750 ad.type = LSM_AUDIT_DATA_DENTRY;
2751 ad.u.dentry = dentry->d_sb->s_root;
2752 return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2755 static int selinux_mount(const char *dev_name,
2756 const struct path *path,
2758 unsigned long flags,
2761 const struct cred *cred = current_cred();
2763 if (flags & MS_REMOUNT)
2764 return superblock_has_perm(cred, path->dentry->d_sb,
2765 FILESYSTEM__REMOUNT, NULL);
2767 return path_has_perm(cred, path, FILE__MOUNTON);
2770 static int selinux_move_mount(const struct path *from_path,
2771 const struct path *to_path)
2773 const struct cred *cred = current_cred();
2775 return path_has_perm(cred, to_path, FILE__MOUNTON);
2778 static int selinux_umount(struct vfsmount *mnt, int flags)
2780 const struct cred *cred = current_cred();
2782 return superblock_has_perm(cred, mnt->mnt_sb,
2783 FILESYSTEM__UNMOUNT, NULL);
2786 static int selinux_fs_context_submount(struct fs_context *fc,
2787 struct super_block *reference)
2789 const struct superblock_security_struct *sbsec = selinux_superblock(reference);
2790 struct selinux_mnt_opts *opts;
2793 * Ensure that fc->security remains NULL when no options are set
2794 * as expected by selinux_set_mnt_opts().
2796 if (!(sbsec->flags & (FSCONTEXT_MNT|CONTEXT_MNT|DEFCONTEXT_MNT)))
2799 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2803 if (sbsec->flags & FSCONTEXT_MNT)
2804 opts->fscontext_sid = sbsec->sid;
2805 if (sbsec->flags & CONTEXT_MNT)
2806 opts->context_sid = sbsec->mntpoint_sid;
2807 if (sbsec->flags & DEFCONTEXT_MNT)
2808 opts->defcontext_sid = sbsec->def_sid;
2809 fc->security = opts;
2813 static int selinux_fs_context_dup(struct fs_context *fc,
2814 struct fs_context *src_fc)
2816 const struct selinux_mnt_opts *src = src_fc->security;
2821 fc->security = kmemdup(src, sizeof(*src), GFP_KERNEL);
2822 return fc->security ? 0 : -ENOMEM;
2825 static const struct fs_parameter_spec selinux_fs_parameters[] = {
2826 fsparam_string(CONTEXT_STR, Opt_context),
2827 fsparam_string(DEFCONTEXT_STR, Opt_defcontext),
2828 fsparam_string(FSCONTEXT_STR, Opt_fscontext),
2829 fsparam_string(ROOTCONTEXT_STR, Opt_rootcontext),
2830 fsparam_flag (SECLABEL_STR, Opt_seclabel),
2834 static int selinux_fs_context_parse_param(struct fs_context *fc,
2835 struct fs_parameter *param)
2837 struct fs_parse_result result;
2840 opt = fs_parse(fc, selinux_fs_parameters, param, &result);
2844 return selinux_add_opt(opt, param->string, &fc->security);
2847 /* inode security operations */
2849 static int selinux_inode_alloc_security(struct inode *inode)
2851 struct inode_security_struct *isec = selinux_inode(inode);
2852 u32 sid = current_sid();
2854 spin_lock_init(&isec->lock);
2855 INIT_LIST_HEAD(&isec->list);
2856 isec->inode = inode;
2857 isec->sid = SECINITSID_UNLABELED;
2858 isec->sclass = SECCLASS_FILE;
2859 isec->task_sid = sid;
2860 isec->initialized = LABEL_INVALID;
2865 static void selinux_inode_free_security(struct inode *inode)
2867 inode_free_security(inode);
2870 static int selinux_dentry_init_security(struct dentry *dentry, int mode,
2871 const struct qstr *name,
2872 const char **xattr_name,
2873 struct lsm_context *cp)
2878 rc = selinux_determine_inode_label(selinux_cred(current_cred()),
2879 d_inode(dentry->d_parent), name,
2880 inode_mode_to_security_class(mode),
2886 *xattr_name = XATTR_NAME_SELINUX;
2888 cp->id = LSM_ID_SELINUX;
2889 return security_sid_to_context(newsid, &cp->context, &cp->len);
2892 static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
2894 const struct cred *old,
2899 struct task_security_struct *tsec;
2901 rc = selinux_determine_inode_label(selinux_cred(old),
2902 d_inode(dentry->d_parent), name,
2903 inode_mode_to_security_class(mode),
2908 tsec = selinux_cred(new);
2909 tsec->create_sid = newsid;
2913 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2914 const struct qstr *qstr,
2915 struct xattr *xattrs, int *xattr_count)
2917 const struct task_security_struct *tsec = selinux_cred(current_cred());
2918 struct superblock_security_struct *sbsec;
2919 struct xattr *xattr = lsm_get_xattr_slot(xattrs, xattr_count);
2925 sbsec = selinux_superblock(dir->i_sb);
2927 newsid = tsec->create_sid;
2928 newsclass = inode_mode_to_security_class(inode->i_mode);
2929 rc = selinux_determine_inode_label(tsec, dir, qstr, newsclass, &newsid);
2933 /* Possibly defer initialization to selinux_complete_init. */
2934 if (sbsec->flags & SE_SBINITIALIZED) {
2935 struct inode_security_struct *isec = selinux_inode(inode);
2936 isec->sclass = newsclass;
2938 isec->initialized = LABEL_INITIALIZED;
2941 if (!selinux_initialized() ||
2942 !(sbsec->flags & SBLABEL_MNT))
2946 rc = security_sid_to_context_force(newsid,
2950 xattr->value = context;
2951 xattr->value_len = clen;
2952 xattr->name = XATTR_SELINUX_SUFFIX;
2958 static int selinux_inode_init_security_anon(struct inode *inode,
2959 const struct qstr *name,
2960 const struct inode *context_inode)
2962 u32 sid = current_sid();
2963 struct common_audit_data ad;
2964 struct inode_security_struct *isec;
2967 if (unlikely(!selinux_initialized()))
2970 isec = selinux_inode(inode);
2973 * We only get here once per ephemeral inode. The inode has
2974 * been initialized via inode_alloc_security but is otherwise
2978 if (context_inode) {
2979 struct inode_security_struct *context_isec =
2980 selinux_inode(context_inode);
2981 if (context_isec->initialized != LABEL_INITIALIZED) {
2982 pr_err("SELinux: context_inode is not initialized\n");
2986 isec->sclass = context_isec->sclass;
2987 isec->sid = context_isec->sid;
2989 isec->sclass = SECCLASS_ANON_INODE;
2990 rc = security_transition_sid(
2992 isec->sclass, name, &isec->sid);
2997 isec->initialized = LABEL_INITIALIZED;
2999 * Now that we've initialized security, check whether we're
3000 * allowed to actually create this type of anonymous inode.
3003 ad.type = LSM_AUDIT_DATA_ANONINODE;
3004 ad.u.anonclass = name ? (const char *)name->name : "?";
3006 return avc_has_perm(sid,
3013 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
3015 return may_create(dir, dentry, SECCLASS_FILE);
3018 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
3020 return may_link(dir, old_dentry, MAY_LINK);
3023 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
3025 return may_link(dir, dentry, MAY_UNLINK);
3028 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
3030 return may_create(dir, dentry, SECCLASS_LNK_FILE);
3033 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask)
3035 return may_create(dir, dentry, SECCLASS_DIR);
3038 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
3040 return may_link(dir, dentry, MAY_RMDIR);
3043 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
3045 return may_create(dir, dentry, inode_mode_to_security_class(mode));
3048 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
3049 struct inode *new_inode, struct dentry *new_dentry)
3051 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
3054 static int selinux_inode_readlink(struct dentry *dentry)
3056 const struct cred *cred = current_cred();
3058 return dentry_has_perm(cred, dentry, FILE__READ);
3061 static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
3064 struct common_audit_data ad;
3065 struct inode_security_struct *isec;
3066 u32 sid = current_sid();
3068 ad.type = LSM_AUDIT_DATA_DENTRY;
3069 ad.u.dentry = dentry;
3070 isec = inode_security_rcu(inode, rcu);
3072 return PTR_ERR(isec);
3074 return avc_has_perm(sid, isec->sid, isec->sclass, FILE__READ, &ad);
3077 static noinline int audit_inode_permission(struct inode *inode,
3078 u32 perms, u32 audited, u32 denied,
3081 struct common_audit_data ad;
3082 struct inode_security_struct *isec = selinux_inode(inode);
3084 ad.type = LSM_AUDIT_DATA_INODE;
3087 return slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms,
3088 audited, denied, result, &ad);
3091 static int selinux_inode_permission(struct inode *inode, int mask)
3095 bool no_block = mask & MAY_NOT_BLOCK;
3096 struct inode_security_struct *isec;
3097 u32 sid = current_sid();
3098 struct av_decision avd;
3100 u32 audited, denied;
3102 from_access = mask & MAY_ACCESS;
3103 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
3105 /* No permission to check. Existence test. */
3109 if (unlikely(IS_PRIVATE(inode)))
3112 perms = file_mask_to_av(inode->i_mode, mask);
3114 isec = inode_security_rcu(inode, no_block);
3116 return PTR_ERR(isec);
3118 rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0,
3120 audited = avc_audit_required(perms, &avd, rc,
3121 from_access ? FILE__AUDIT_ACCESS : 0,
3123 if (likely(!audited))
3126 rc2 = audit_inode_permission(inode, perms, audited, denied, rc);
3132 static int selinux_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
3133 struct iattr *iattr)
3135 const struct cred *cred = current_cred();
3136 struct inode *inode = d_backing_inode(dentry);
3137 unsigned int ia_valid = iattr->ia_valid;
3138 u32 av = FILE__WRITE;
3140 /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */
3141 if (ia_valid & ATTR_FORCE) {
3142 ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE |
3148 if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
3149 ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
3150 return dentry_has_perm(cred, dentry, FILE__SETATTR);
3152 if (selinux_policycap_openperm() &&
3153 inode->i_sb->s_magic != SOCKFS_MAGIC &&
3154 (ia_valid & ATTR_SIZE) &&
3155 !(ia_valid & ATTR_FILE))
3158 return dentry_has_perm(cred, dentry, av);
3161 static int selinux_inode_getattr(const struct path *path)
3163 return path_has_perm(current_cred(), path, FILE__GETATTR);
3166 static bool has_cap_mac_admin(bool audit)
3168 const struct cred *cred = current_cred();
3169 unsigned int opts = audit ? CAP_OPT_NONE : CAP_OPT_NOAUDIT;
3171 if (cap_capable(cred, &init_user_ns, CAP_MAC_ADMIN, opts))
3173 if (cred_has_capability(cred, CAP_MAC_ADMIN, opts, true))
3179 * selinux_inode_xattr_skipcap - Skip the xattr capability checks?
3180 * @name: name of the xattr
3182 * Returns 1 to indicate that SELinux "owns" the access control rights to xattrs
3183 * named @name; the LSM layer should avoid enforcing any traditional
3184 * capability based access controls on this xattr. Returns 0 to indicate that
3185 * SELinux does not "own" the access control rights to xattrs named @name and is
3186 * deferring to the LSM layer for further access controls, including capability
3189 static int selinux_inode_xattr_skipcap(const char *name)
3191 /* require capability check if not a selinux xattr */
3192 return !strcmp(name, XATTR_NAME_SELINUX);
3195 static int selinux_inode_setxattr(struct mnt_idmap *idmap,
3196 struct dentry *dentry, const char *name,
3197 const void *value, size_t size, int flags)
3199 struct inode *inode = d_backing_inode(dentry);
3200 struct inode_security_struct *isec;
3201 struct superblock_security_struct *sbsec;
3202 struct common_audit_data ad;
3203 u32 newsid, sid = current_sid();
3206 /* if not a selinux xattr, only check the ordinary setattr perm */
3207 if (strcmp(name, XATTR_NAME_SELINUX))
3208 return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
3210 if (!selinux_initialized())
3211 return (inode_owner_or_capable(idmap, inode) ? 0 : -EPERM);
3213 sbsec = selinux_superblock(inode->i_sb);
3214 if (!(sbsec->flags & SBLABEL_MNT))
3217 if (!inode_owner_or_capable(idmap, inode))
3220 ad.type = LSM_AUDIT_DATA_DENTRY;
3221 ad.u.dentry = dentry;
3223 isec = backing_inode_security(dentry);
3224 rc = avc_has_perm(sid, isec->sid, isec->sclass,
3225 FILE__RELABELFROM, &ad);
3229 rc = security_context_to_sid(value, size, &newsid,
3231 if (rc == -EINVAL) {
3232 if (!has_cap_mac_admin(true)) {
3233 struct audit_buffer *ab;
3236 /* We strip a nul only if it is at the end, otherwise the
3237 * context contains a nul and we should audit that */
3239 const char *str = value;
3241 if (str[size - 1] == '\0')
3242 audit_size = size - 1;
3248 ab = audit_log_start(audit_context(),
3249 GFP_ATOMIC, AUDIT_SELINUX_ERR);
3252 audit_log_format(ab, "op=setxattr invalid_context=");
3253 audit_log_n_untrustedstring(ab, value, audit_size);
3258 rc = security_context_to_sid_force(value,
3264 rc = avc_has_perm(sid, newsid, isec->sclass,
3265 FILE__RELABELTO, &ad);
3269 rc = security_validate_transition(isec->sid, newsid,
3274 return avc_has_perm(newsid,
3276 SECCLASS_FILESYSTEM,
3277 FILESYSTEM__ASSOCIATE,
3281 static int selinux_inode_set_acl(struct mnt_idmap *idmap,
3282 struct dentry *dentry, const char *acl_name,
3283 struct posix_acl *kacl)
3285 return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
3288 static int selinux_inode_get_acl(struct mnt_idmap *idmap,
3289 struct dentry *dentry, const char *acl_name)
3291 return dentry_has_perm(current_cred(), dentry, FILE__GETATTR);
3294 static int selinux_inode_remove_acl(struct mnt_idmap *idmap,
3295 struct dentry *dentry, const char *acl_name)
3297 return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
3300 static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
3301 const void *value, size_t size,
3304 struct inode *inode = d_backing_inode(dentry);
3305 struct inode_security_struct *isec;
3309 if (strcmp(name, XATTR_NAME_SELINUX)) {
3310 /* Not an attribute we recognize, so nothing to do. */
3314 if (!selinux_initialized()) {
3315 /* If we haven't even been initialized, then we can't validate
3316 * against a policy, so leave the label as invalid. It may
3317 * resolve to a valid label on the next revalidation try if
3318 * we've since initialized.
3323 rc = security_context_to_sid_force(value, size,
3326 pr_err("SELinux: unable to map context to SID"
3327 "for (%s, %lu), rc=%d\n",
3328 inode->i_sb->s_id, inode->i_ino, -rc);
3332 isec = backing_inode_security(dentry);
3333 spin_lock(&isec->lock);
3334 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3336 isec->initialized = LABEL_INITIALIZED;
3337 spin_unlock(&isec->lock);
3340 static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
3342 const struct cred *cred = current_cred();
3344 return dentry_has_perm(cred, dentry, FILE__GETATTR);
3347 static int selinux_inode_listxattr(struct dentry *dentry)
3349 const struct cred *cred = current_cred();
3351 return dentry_has_perm(cred, dentry, FILE__GETATTR);
3354 static int selinux_inode_removexattr(struct mnt_idmap *idmap,
3355 struct dentry *dentry, const char *name)
3357 /* if not a selinux xattr, only check the ordinary setattr perm */
3358 if (strcmp(name, XATTR_NAME_SELINUX))
3359 return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
3361 if (!selinux_initialized())
3364 /* No one is allowed to remove a SELinux security label.
3365 You can change the label, but all data must be labeled. */
3369 static int selinux_path_notify(const struct path *path, u64 mask,
3370 unsigned int obj_type)
3375 struct common_audit_data ad;
3377 ad.type = LSM_AUDIT_DATA_PATH;
3381 * Set permission needed based on the type of mark being set.
3382 * Performs an additional check for sb watches.
3385 case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
3386 perm = FILE__WATCH_MOUNT;
3388 case FSNOTIFY_OBJ_TYPE_SB:
3389 perm = FILE__WATCH_SB;
3390 ret = superblock_has_perm(current_cred(), path->dentry->d_sb,
3391 FILESYSTEM__WATCH, &ad);
3395 case FSNOTIFY_OBJ_TYPE_INODE:
3402 /* blocking watches require the file:watch_with_perm permission */
3403 if (mask & (ALL_FSNOTIFY_PERM_EVENTS))
3404 perm |= FILE__WATCH_WITH_PERM;
3406 /* watches on read-like events need the file:watch_reads permission */
3407 if (mask & (FS_ACCESS | FS_ACCESS_PERM | FS_PRE_ACCESS |
3409 perm |= FILE__WATCH_READS;
3411 return path_has_perm(current_cred(), path, perm);
3415 * Copy the inode security context value to the user.
3417 * Permission check is handled by selinux_inode_getxattr hook.
3419 static int selinux_inode_getsecurity(struct mnt_idmap *idmap,
3420 struct inode *inode, const char *name,
3421 void **buffer, bool alloc)
3425 char *context = NULL;
3426 struct inode_security_struct *isec;
3429 * If we're not initialized yet, then we can't validate contexts, so
3430 * just let vfs_getxattr fall back to using the on-disk xattr.
3432 if (!selinux_initialized() ||
3433 strcmp(name, XATTR_SELINUX_SUFFIX))
3437 * If the caller has CAP_MAC_ADMIN, then get the raw context
3438 * value even if it is not defined by current policy; otherwise,
3439 * use the in-core value under current policy.
3440 * Use the non-auditing forms of the permission checks since
3441 * getxattr may be called by unprivileged processes commonly
3442 * and lack of permission just means that we fall back to the
3443 * in-core context value, not a denial.
3445 isec = inode_security(inode);
3446 if (has_cap_mac_admin(false))
3447 error = security_sid_to_context_force(isec->sid, &context,
3450 error = security_sid_to_context(isec->sid,
3464 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
3465 const void *value, size_t size, int flags)
3467 struct inode_security_struct *isec = inode_security_novalidate(inode);
3468 struct superblock_security_struct *sbsec;
3472 if (strcmp(name, XATTR_SELINUX_SUFFIX))
3475 sbsec = selinux_superblock(inode->i_sb);
3476 if (!(sbsec->flags & SBLABEL_MNT))
3479 if (!value || !size)
3482 rc = security_context_to_sid(value, size, &newsid,
3487 spin_lock(&isec->lock);
3488 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3490 isec->initialized = LABEL_INITIALIZED;
3491 spin_unlock(&isec->lock);
3495 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
3497 const int len = sizeof(XATTR_NAME_SELINUX);
3499 if (!selinux_initialized())
3502 if (buffer && len <= buffer_size)
3503 memcpy(buffer, XATTR_NAME_SELINUX, len);
3507 static void selinux_inode_getlsmprop(struct inode *inode, struct lsm_prop *prop)
3509 struct inode_security_struct *isec = inode_security_novalidate(inode);
3511 prop->selinux.secid = isec->sid;
3514 static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
3516 struct lsm_prop prop;
3517 struct task_security_struct *tsec;
3518 struct cred *new_creds = *new;
3520 if (new_creds == NULL) {
3521 new_creds = prepare_creds();
3526 tsec = selinux_cred(new_creds);
3527 /* Get label from overlay inode and set it in create_sid */
3528 selinux_inode_getlsmprop(d_inode(src), &prop);
3529 tsec->create_sid = prop.selinux.secid;
3534 static int selinux_inode_copy_up_xattr(struct dentry *dentry, const char *name)
3536 /* The copy_up hook above sets the initial context on an inode, but we
3537 * don't then want to overwrite it by blindly copying all the lower
3538 * xattrs up. Instead, filter out SELinux-related xattrs following
3541 if (selinux_initialized() && !strcmp(name, XATTR_NAME_SELINUX))
3542 return -ECANCELED; /* Discard */
3544 * Any other attribute apart from SELINUX is not claimed, supported
3550 /* kernfs node operations */
3552 static int selinux_kernfs_init_security(struct kernfs_node *kn_dir,
3553 struct kernfs_node *kn)
3555 const struct task_security_struct *tsec = selinux_cred(current_cred());
3556 u32 parent_sid, newsid, clen;
3560 rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, NULL, 0);
3567 context = kmalloc(clen, GFP_KERNEL);
3571 rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, context, clen);
3577 rc = security_context_to_sid(context, clen, &parent_sid,
3583 if (tsec->create_sid) {
3584 newsid = tsec->create_sid;
3586 u16 secclass = inode_mode_to_security_class(kn->mode);
3590 q.hash_len = hashlen_string(kn_dir, kn->name);
3592 rc = security_transition_sid(tsec->sid,
3593 parent_sid, secclass, &q,
3599 rc = security_sid_to_context_force(newsid,
3604 rc = kernfs_xattr_set(kn, XATTR_NAME_SELINUX, context, clen,
3611 /* file security operations */
3613 static int selinux_revalidate_file_permission(struct file *file, int mask)
3615 const struct cred *cred = current_cred();
3616 struct inode *inode = file_inode(file);
3618 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
3619 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
3622 return file_has_perm(cred, file,
3623 file_mask_to_av(inode->i_mode, mask));
3626 static int selinux_file_permission(struct file *file, int mask)
3628 struct inode *inode = file_inode(file);
3629 struct file_security_struct *fsec = selinux_file(file);
3630 struct inode_security_struct *isec;
3631 u32 sid = current_sid();
3634 /* No permission to check. Existence test. */
3637 isec = inode_security(inode);
3638 if (sid == fsec->sid && fsec->isid == isec->sid &&
3639 fsec->pseqno == avc_policy_seqno())
3640 /* No change since file_open check. */
3643 return selinux_revalidate_file_permission(file, mask);
3646 static int selinux_file_alloc_security(struct file *file)
3648 struct file_security_struct *fsec = selinux_file(file);
3649 u32 sid = current_sid();
3652 fsec->fown_sid = sid;
3658 * Check whether a task has the ioctl permission and cmd
3659 * operation to an inode.
3661 static int ioctl_has_perm(const struct cred *cred, struct file *file,
3662 u32 requested, u16 cmd)
3664 struct common_audit_data ad;
3665 struct file_security_struct *fsec = selinux_file(file);
3666 struct inode *inode = file_inode(file);
3667 struct inode_security_struct *isec;
3668 struct lsm_ioctlop_audit ioctl;
3669 u32 ssid = cred_sid(cred);
3671 u8 driver = cmd >> 8;
3672 u8 xperm = cmd & 0xff;
3674 ad.type = LSM_AUDIT_DATA_IOCTL_OP;
3677 ad.u.op->path = file->f_path;
3679 if (ssid != fsec->sid) {
3680 rc = avc_has_perm(ssid, fsec->sid,
3688 if (unlikely(IS_PRIVATE(inode)))
3691 isec = inode_security(inode);
3692 rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass, requested,
3693 driver, AVC_EXT_IOCTL, xperm, &ad);
3698 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
3701 const struct cred *cred = current_cred();
3708 case FS_IOC_GETFLAGS:
3709 case FS_IOC_GETVERSION:
3710 error = file_has_perm(cred, file, FILE__GETATTR);
3713 case FS_IOC_SETFLAGS:
3714 case FS_IOC_SETVERSION:
3715 error = file_has_perm(cred, file, FILE__SETATTR);
3718 /* sys_ioctl() checks */
3721 error = file_has_perm(cred, file, 0);
3726 error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
3727 CAP_OPT_NONE, true);
3732 if (!selinux_policycap_ioctl_skip_cloexec())
3733 error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
3736 /* default case assumes that the command will go
3737 * to the file's ioctl() function.
3740 error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
3745 static int selinux_file_ioctl_compat(struct file *file, unsigned int cmd,
3749 * If we are in a 64-bit kernel running 32-bit userspace, we need to
3750 * make sure we don't compare 32-bit flags to 64-bit flags.
3753 case FS_IOC32_GETFLAGS:
3754 cmd = FS_IOC_GETFLAGS;
3756 case FS_IOC32_SETFLAGS:
3757 cmd = FS_IOC_SETFLAGS;
3759 case FS_IOC32_GETVERSION:
3760 cmd = FS_IOC_GETVERSION;
3762 case FS_IOC32_SETVERSION:
3763 cmd = FS_IOC_SETVERSION;
3769 return selinux_file_ioctl(file, cmd, arg);
3772 static int default_noexec __ro_after_init;
3774 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
3776 const struct cred *cred = current_cred();
3777 u32 sid = cred_sid(cred);
3780 if (default_noexec &&
3781 (prot & PROT_EXEC) && (!file || IS_PRIVATE(file_inode(file)) ||
3782 (!shared && (prot & PROT_WRITE)))) {
3784 * We are making executable an anonymous mapping or a
3785 * private file mapping that will also be writable.
3786 * This has an additional check.
3788 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3789 PROCESS__EXECMEM, NULL);
3795 /* read access is always possible with a mapping */
3796 u32 av = FILE__READ;
3798 /* write access only matters if the mapping is shared */
3799 if (shared && (prot & PROT_WRITE))
3802 if (prot & PROT_EXEC)
3803 av |= FILE__EXECUTE;
3805 return file_has_perm(cred, file, av);
3812 static int selinux_mmap_addr(unsigned long addr)
3816 if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
3817 u32 sid = current_sid();
3818 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3819 MEMPROTECT__MMAP_ZERO, NULL);
3825 static int selinux_mmap_file(struct file *file,
3826 unsigned long reqprot __always_unused,
3827 unsigned long prot, unsigned long flags)
3829 struct common_audit_data ad;
3833 ad.type = LSM_AUDIT_DATA_FILE;
3835 rc = inode_has_perm(current_cred(), file_inode(file),
3841 return file_map_prot_check(file, prot,
3842 (flags & MAP_TYPE) == MAP_SHARED);
3845 static int selinux_file_mprotect(struct vm_area_struct *vma,
3846 unsigned long reqprot __always_unused,
3849 const struct cred *cred = current_cred();
3850 u32 sid = cred_sid(cred);
3852 if (default_noexec &&
3853 (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
3856 * We don't use the vma_is_initial_heap() helper as it has
3857 * a history of problems and is currently broken on systems
3858 * where there is no heap, e.g. brk == start_brk. Before
3859 * replacing the conditional below with vma_is_initial_heap(),
3860 * or something similar, please ensure that the logic is the
3861 * same as what we have below or you have tested every possible
3862 * corner case you can think to test.
3864 if (vma->vm_start >= vma->vm_mm->start_brk &&
3865 vma->vm_end <= vma->vm_mm->brk) {
3866 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3867 PROCESS__EXECHEAP, NULL);
3868 } else if (!vma->vm_file && (vma_is_initial_stack(vma) ||
3869 vma_is_stack_for_current(vma))) {
3870 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3871 PROCESS__EXECSTACK, NULL);
3872 } else if (vma->vm_file && vma->anon_vma) {
3874 * We are making executable a file mapping that has
3875 * had some COW done. Since pages might have been
3876 * written, check ability to execute the possibly
3877 * modified content. This typically should only
3878 * occur for text relocations.
3880 rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
3886 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3889 static int selinux_file_lock(struct file *file, unsigned int cmd)
3891 const struct cred *cred = current_cred();
3893 return file_has_perm(cred, file, FILE__LOCK);
3896 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3899 const struct cred *cred = current_cred();
3904 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
3905 err = file_has_perm(cred, file, FILE__WRITE);
3914 case F_GETOWNER_UIDS:
3915 /* Just check FD__USE permission */
3916 err = file_has_perm(cred, file, 0);
3924 #if BITS_PER_LONG == 32
3929 err = file_has_perm(cred, file, FILE__LOCK);
3936 static void selinux_file_set_fowner(struct file *file)
3938 struct file_security_struct *fsec;
3940 fsec = selinux_file(file);
3941 fsec->fown_sid = current_sid();
3944 static int selinux_file_send_sigiotask(struct task_struct *tsk,
3945 struct fown_struct *fown, int signum)
3948 u32 sid = task_sid_obj(tsk);
3950 struct file_security_struct *fsec;
3952 /* struct fown_struct is never outside the context of a struct file */
3955 fsec = selinux_file(file);
3958 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
3960 perm = signal_to_av(signum);
3962 return avc_has_perm(fsec->fown_sid, sid,
3963 SECCLASS_PROCESS, perm, NULL);
3966 static int selinux_file_receive(struct file *file)
3968 const struct cred *cred = current_cred();
3970 return file_has_perm(cred, file, file_to_av(file));
3973 static int selinux_file_open(struct file *file)
3975 struct file_security_struct *fsec;
3976 struct inode_security_struct *isec;
3978 fsec = selinux_file(file);
3979 isec = inode_security(file_inode(file));
3981 * Save inode label and policy sequence number
3982 * at open-time so that selinux_file_permission
3983 * can determine whether revalidation is necessary.
3984 * Task label is already saved in the file security
3985 * struct as its SID.
3987 fsec->isid = isec->sid;
3988 fsec->pseqno = avc_policy_seqno();
3990 * Since the inode label or policy seqno may have changed
3991 * between the selinux_inode_permission check and the saving
3992 * of state above, recheck that access is still permitted.
3993 * Otherwise, access might never be revalidated against the
3994 * new inode label or new policy.
3995 * This check is not redundant - do not remove.
3997 return file_path_has_perm(file->f_cred, file, open_file_to_av(file));
4000 /* task security operations */
4002 static int selinux_task_alloc(struct task_struct *task,
4003 unsigned long clone_flags)
4005 u32 sid = current_sid();
4007 return avc_has_perm(sid, sid, SECCLASS_PROCESS, PROCESS__FORK, NULL);
4011 * prepare a new set of credentials for modification
4013 static int selinux_cred_prepare(struct cred *new, const struct cred *old,
4016 const struct task_security_struct *old_tsec = selinux_cred(old);
4017 struct task_security_struct *tsec = selinux_cred(new);
4024 * transfer the SELinux data to a blank set of creds
4026 static void selinux_cred_transfer(struct cred *new, const struct cred *old)
4028 const struct task_security_struct *old_tsec = selinux_cred(old);
4029 struct task_security_struct *tsec = selinux_cred(new);
4034 static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
4036 *secid = cred_sid(c);
4039 static void selinux_cred_getlsmprop(const struct cred *c, struct lsm_prop *prop)
4041 prop->selinux.secid = cred_sid(c);
4045 * set the security data for a kernel service
4046 * - all the creation contexts are set to unlabelled
4048 static int selinux_kernel_act_as(struct cred *new, u32 secid)
4050 struct task_security_struct *tsec = selinux_cred(new);
4051 u32 sid = current_sid();
4054 ret = avc_has_perm(sid, secid,
4055 SECCLASS_KERNEL_SERVICE,
4056 KERNEL_SERVICE__USE_AS_OVERRIDE,
4060 tsec->create_sid = 0;
4061 tsec->keycreate_sid = 0;
4062 tsec->sockcreate_sid = 0;
4068 * set the file creation context in a security record to the same as the
4069 * objective context of the specified inode
4071 static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
4073 struct inode_security_struct *isec = inode_security(inode);
4074 struct task_security_struct *tsec = selinux_cred(new);
4075 u32 sid = current_sid();
4078 ret = avc_has_perm(sid, isec->sid,
4079 SECCLASS_KERNEL_SERVICE,
4080 KERNEL_SERVICE__CREATE_FILES_AS,
4084 tsec->create_sid = isec->sid;
4088 static int selinux_kernel_module_request(char *kmod_name)
4090 struct common_audit_data ad;
4092 ad.type = LSM_AUDIT_DATA_KMOD;
4093 ad.u.kmod_name = kmod_name;
4095 return avc_has_perm(current_sid(), SECINITSID_KERNEL, SECCLASS_SYSTEM,
4096 SYSTEM__MODULE_REQUEST, &ad);
4099 static int selinux_kernel_module_from_file(struct file *file)
4101 struct common_audit_data ad;
4102 struct inode_security_struct *isec;
4103 struct file_security_struct *fsec;
4104 u32 sid = current_sid();
4109 return avc_has_perm(sid, sid, SECCLASS_SYSTEM,
4110 SYSTEM__MODULE_LOAD, NULL);
4114 ad.type = LSM_AUDIT_DATA_FILE;
4117 fsec = selinux_file(file);
4118 if (sid != fsec->sid) {
4119 rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
4124 isec = inode_security(file_inode(file));
4125 return avc_has_perm(sid, isec->sid, SECCLASS_SYSTEM,
4126 SYSTEM__MODULE_LOAD, &ad);
4129 static int selinux_kernel_read_file(struct file *file,
4130 enum kernel_read_file_id id,
4136 case READING_MODULE:
4137 rc = selinux_kernel_module_from_file(contents ? file : NULL);
4146 static int selinux_kernel_load_data(enum kernel_load_data_id id, bool contents)
4151 case LOADING_MODULE:
4152 rc = selinux_kernel_module_from_file(NULL);
4161 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
4163 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4164 PROCESS__SETPGID, NULL);
4167 static int selinux_task_getpgid(struct task_struct *p)
4169 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4170 PROCESS__GETPGID, NULL);
4173 static int selinux_task_getsid(struct task_struct *p)
4175 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4176 PROCESS__GETSESSION, NULL);
4179 static void selinux_current_getlsmprop_subj(struct lsm_prop *prop)
4181 prop->selinux.secid = current_sid();
4184 static void selinux_task_getlsmprop_obj(struct task_struct *p,
4185 struct lsm_prop *prop)
4187 prop->selinux.secid = task_sid_obj(p);
4190 static int selinux_task_setnice(struct task_struct *p, int nice)
4192 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4193 PROCESS__SETSCHED, NULL);
4196 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
4198 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4199 PROCESS__SETSCHED, NULL);
4202 static int selinux_task_getioprio(struct task_struct *p)
4204 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4205 PROCESS__GETSCHED, NULL);
4208 static int selinux_task_prlimit(const struct cred *cred, const struct cred *tcred,
4215 if (flags & LSM_PRLIMIT_WRITE)
4216 av |= PROCESS__SETRLIMIT;
4217 if (flags & LSM_PRLIMIT_READ)
4218 av |= PROCESS__GETRLIMIT;
4219 return avc_has_perm(cred_sid(cred), cred_sid(tcred),
4220 SECCLASS_PROCESS, av, NULL);
4223 static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
4224 struct rlimit *new_rlim)
4226 struct rlimit *old_rlim = p->signal->rlim + resource;
4228 /* Control the ability to change the hard limit (whether
4229 lowering or raising it), so that the hard limit can
4230 later be used as a safe reset point for the soft limit
4231 upon context transitions. See selinux_bprm_committing_creds. */
4232 if (old_rlim->rlim_max != new_rlim->rlim_max)
4233 return avc_has_perm(current_sid(), task_sid_obj(p),
4234 SECCLASS_PROCESS, PROCESS__SETRLIMIT, NULL);
4239 static int selinux_task_setscheduler(struct task_struct *p)
4241 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4242 PROCESS__SETSCHED, NULL);
4245 static int selinux_task_getscheduler(struct task_struct *p)
4247 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4248 PROCESS__GETSCHED, NULL);
4251 static int selinux_task_movememory(struct task_struct *p)
4253 return avc_has_perm(current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
4254 PROCESS__SETSCHED, NULL);
4257 static int selinux_task_kill(struct task_struct *p, struct kernel_siginfo *info,
4258 int sig, const struct cred *cred)
4264 perm = PROCESS__SIGNULL; /* null signal; existence test */
4266 perm = signal_to_av(sig);
4268 secid = current_sid();
4270 secid = cred_sid(cred);
4271 return avc_has_perm(secid, task_sid_obj(p), SECCLASS_PROCESS, perm, NULL);
4274 static void selinux_task_to_inode(struct task_struct *p,
4275 struct inode *inode)
4277 struct inode_security_struct *isec = selinux_inode(inode);
4278 u32 sid = task_sid_obj(p);
4280 spin_lock(&isec->lock);
4281 isec->sclass = inode_mode_to_security_class(inode->i_mode);
4283 isec->initialized = LABEL_INITIALIZED;
4284 spin_unlock(&isec->lock);
4287 static int selinux_userns_create(const struct cred *cred)
4289 u32 sid = current_sid();
4291 return avc_has_perm(sid, sid, SECCLASS_USER_NAMESPACE,
4292 USER_NAMESPACE__CREATE, NULL);
4295 /* Returns error only if unable to parse addresses */
4296 static int selinux_parse_skb_ipv4(struct sk_buff *skb,
4297 struct common_audit_data *ad, u8 *proto)
4299 int offset, ihlen, ret = -EINVAL;
4300 struct iphdr _iph, *ih;
4302 offset = skb_network_offset(skb);
4303 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
4307 ihlen = ih->ihl * 4;
4308 if (ihlen < sizeof(_iph))
4311 ad->u.net->v4info.saddr = ih->saddr;
4312 ad->u.net->v4info.daddr = ih->daddr;
4316 *proto = ih->protocol;
4318 switch (ih->protocol) {
4320 struct tcphdr _tcph, *th;
4322 if (ntohs(ih->frag_off) & IP_OFFSET)
4326 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
4330 ad->u.net->sport = th->source;
4331 ad->u.net->dport = th->dest;
4336 struct udphdr _udph, *uh;
4338 if (ntohs(ih->frag_off) & IP_OFFSET)
4342 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
4346 ad->u.net->sport = uh->source;
4347 ad->u.net->dport = uh->dest;
4351 case IPPROTO_DCCP: {
4352 struct dccp_hdr _dccph, *dh;
4354 if (ntohs(ih->frag_off) & IP_OFFSET)
4358 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
4362 ad->u.net->sport = dh->dccph_sport;
4363 ad->u.net->dport = dh->dccph_dport;
4367 #if IS_ENABLED(CONFIG_IP_SCTP)
4368 case IPPROTO_SCTP: {
4369 struct sctphdr _sctph, *sh;
4371 if (ntohs(ih->frag_off) & IP_OFFSET)
4375 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
4379 ad->u.net->sport = sh->source;
4380 ad->u.net->dport = sh->dest;
4391 #if IS_ENABLED(CONFIG_IPV6)
4393 /* Returns error only if unable to parse addresses */
4394 static int selinux_parse_skb_ipv6(struct sk_buff *skb,
4395 struct common_audit_data *ad, u8 *proto)
4398 int ret = -EINVAL, offset;
4399 struct ipv6hdr _ipv6h, *ip6;
4402 offset = skb_network_offset(skb);
4403 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
4407 ad->u.net->v6info.saddr = ip6->saddr;
4408 ad->u.net->v6info.daddr = ip6->daddr;
4411 nexthdr = ip6->nexthdr;
4412 offset += sizeof(_ipv6h);
4413 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
4422 struct tcphdr _tcph, *th;
4424 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
4428 ad->u.net->sport = th->source;
4429 ad->u.net->dport = th->dest;
4434 struct udphdr _udph, *uh;
4436 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
4440 ad->u.net->sport = uh->source;
4441 ad->u.net->dport = uh->dest;
4445 case IPPROTO_DCCP: {
4446 struct dccp_hdr _dccph, *dh;
4448 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
4452 ad->u.net->sport = dh->dccph_sport;
4453 ad->u.net->dport = dh->dccph_dport;
4457 #if IS_ENABLED(CONFIG_IP_SCTP)
4458 case IPPROTO_SCTP: {
4459 struct sctphdr _sctph, *sh;
4461 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
4465 ad->u.net->sport = sh->source;
4466 ad->u.net->dport = sh->dest;
4470 /* includes fragments */
4480 static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
4481 char **_addrp, int src, u8 *proto)
4486 switch (ad->u.net->family) {
4488 ret = selinux_parse_skb_ipv4(skb, ad, proto);
4491 addrp = (char *)(src ? &ad->u.net->v4info.saddr :
4492 &ad->u.net->v4info.daddr);
4495 #if IS_ENABLED(CONFIG_IPV6)
4497 ret = selinux_parse_skb_ipv6(skb, ad, proto);
4500 addrp = (char *)(src ? &ad->u.net->v6info.saddr :
4501 &ad->u.net->v6info.daddr);
4511 "SELinux: failure in selinux_parse_skb(),"
4512 " unable to parse packet\n");
4522 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
4524 * @family: protocol family
4525 * @sid: the packet's peer label SID
4528 * Check the various different forms of network peer labeling and determine
4529 * the peer label/SID for the packet; most of the magic actually occurs in
4530 * the security server function security_net_peersid_cmp(). The function
4531 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
4532 * or -EACCES if @sid is invalid due to inconsistencies with the different
4536 static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
4543 err = selinux_xfrm_skb_sid(skb, &xfrm_sid);
4546 err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
4550 err = security_net_peersid_resolve(nlbl_sid,
4551 nlbl_type, xfrm_sid, sid);
4552 if (unlikely(err)) {
4554 "SELinux: failure in selinux_skb_peerlbl_sid(),"
4555 " unable to determine packet's peer label\n");
4563 * selinux_conn_sid - Determine the child socket label for a connection
4564 * @sk_sid: the parent socket's SID
4565 * @skb_sid: the packet's SID
4566 * @conn_sid: the resulting connection SID
4568 * If @skb_sid is valid then the user:role:type information from @sk_sid is
4569 * combined with the MLS information from @skb_sid in order to create
4570 * @conn_sid. If @skb_sid is not valid then @conn_sid is simply a copy
4571 * of @sk_sid. Returns zero on success, negative values on failure.
4574 static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid)
4578 if (skb_sid != SECSID_NULL)
4579 err = security_sid_mls_copy(sk_sid, skb_sid,
4587 /* socket security operations */
4589 static int socket_sockcreate_sid(const struct task_security_struct *tsec,
4590 u16 secclass, u32 *socksid)
4592 if (tsec->sockcreate_sid > SECSID_NULL) {
4593 *socksid = tsec->sockcreate_sid;
4597 return security_transition_sid(tsec->sid, tsec->sid,
4598 secclass, NULL, socksid);
4601 static bool sock_skip_has_perm(u32 sid)
4603 if (sid == SECINITSID_KERNEL)
4607 * Before POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT, sockets that
4608 * inherited the kernel context from early boot used to be skipped
4609 * here, so preserve that behavior unless the capability is set.
4611 * By setting the capability the policy signals that it is ready
4612 * for this quirk to be fixed. Note that sockets created by a kernel
4613 * thread or a usermode helper executed without a transition will
4614 * still be skipped in this check regardless of the policycap
4617 if (!selinux_policycap_userspace_initial_context() &&
4618 sid == SECINITSID_INIT)
4624 static int sock_has_perm(struct sock *sk, u32 perms)
4626 struct sk_security_struct *sksec = sk->sk_security;
4627 struct common_audit_data ad;
4628 struct lsm_network_audit net;
4630 if (sock_skip_has_perm(sksec->sid))
4633 ad_net_init_from_sk(&ad, &net, sk);
4635 return avc_has_perm(current_sid(), sksec->sid, sksec->sclass, perms,
4639 static int selinux_socket_create(int family, int type,
4640 int protocol, int kern)
4642 const struct task_security_struct *tsec = selinux_cred(current_cred());
4650 secclass = socket_type_to_security_class(family, type, protocol);
4651 rc = socket_sockcreate_sid(tsec, secclass, &newsid);
4655 return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
4658 static int selinux_socket_post_create(struct socket *sock, int family,
4659 int type, int protocol, int kern)
4661 const struct task_security_struct *tsec = selinux_cred(current_cred());
4662 struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock));
4663 struct sk_security_struct *sksec;
4664 u16 sclass = socket_type_to_security_class(family, type, protocol);
4665 u32 sid = SECINITSID_KERNEL;
4669 err = socket_sockcreate_sid(tsec, sclass, &sid);
4674 isec->sclass = sclass;
4676 isec->initialized = LABEL_INITIALIZED;
4679 sksec = selinux_sock(sock->sk);
4680 sksec->sclass = sclass;
4682 /* Allows detection of the first association on this socket */
4683 if (sksec->sclass == SECCLASS_SCTP_SOCKET)
4684 sksec->sctp_assoc_state = SCTP_ASSOC_UNSET;
4686 err = selinux_netlbl_socket_post_create(sock->sk, family);
4692 static int selinux_socket_socketpair(struct socket *socka,
4693 struct socket *sockb)
4695 struct sk_security_struct *sksec_a = selinux_sock(socka->sk);
4696 struct sk_security_struct *sksec_b = selinux_sock(sockb->sk);
4698 sksec_a->peer_sid = sksec_b->sid;
4699 sksec_b->peer_sid = sksec_a->sid;
4704 /* Range of port numbers used to automatically bind.
4705 Need to determine whether we should perform a name_bind
4706 permission check between the socket and the port number. */
4708 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
4710 struct sock *sk = sock->sk;
4711 struct sk_security_struct *sksec = selinux_sock(sk);
4715 err = sock_has_perm(sk, SOCKET__BIND);
4719 /* If PF_INET or PF_INET6, check name_bind permission for the port. */
4720 family = sk->sk_family;
4721 if (family == PF_INET || family == PF_INET6) {
4723 struct common_audit_data ad;
4724 struct lsm_network_audit net = {0,};
4725 struct sockaddr_in *addr4 = NULL;
4726 struct sockaddr_in6 *addr6 = NULL;
4728 unsigned short snum;
4732 * sctp_bindx(3) calls via selinux_sctp_bind_connect()
4733 * that validates multiple binding addresses. Because of this
4734 * need to check address->sa_family as it is possible to have
4735 * sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
4737 if (addrlen < offsetofend(struct sockaddr, sa_family))
4739 family_sa = address->sa_family;
4740 switch (family_sa) {
4743 if (addrlen < sizeof(struct sockaddr_in))
4745 addr4 = (struct sockaddr_in *)address;
4746 if (family_sa == AF_UNSPEC) {
4747 if (family == PF_INET6) {
4748 /* Length check from inet6_bind_sk() */
4749 if (addrlen < SIN6_LEN_RFC2133)
4751 /* Family check from __inet6_bind() */
4754 /* see __inet_bind(), we only want to allow
4755 * AF_UNSPEC if the address is INADDR_ANY
4757 if (addr4->sin_addr.s_addr != htonl(INADDR_ANY))
4759 family_sa = AF_INET;
4761 snum = ntohs(addr4->sin_port);
4762 addrp = (char *)&addr4->sin_addr.s_addr;
4765 if (addrlen < SIN6_LEN_RFC2133)
4767 addr6 = (struct sockaddr_in6 *)address;
4768 snum = ntohs(addr6->sin6_port);
4769 addrp = (char *)&addr6->sin6_addr.s6_addr;
4775 ad.type = LSM_AUDIT_DATA_NET;
4777 ad.u.net->sport = htons(snum);
4778 ad.u.net->family = family_sa;
4783 inet_get_local_port_range(sock_net(sk), &low, &high);
4785 if (inet_port_requires_bind_service(sock_net(sk), snum) ||
4786 snum < low || snum > high) {
4787 err = sel_netport_sid(sk->sk_protocol,
4791 err = avc_has_perm(sksec->sid, sid,
4793 SOCKET__NAME_BIND, &ad);
4799 switch (sksec->sclass) {
4800 case SECCLASS_TCP_SOCKET:
4801 node_perm = TCP_SOCKET__NODE_BIND;
4804 case SECCLASS_UDP_SOCKET:
4805 node_perm = UDP_SOCKET__NODE_BIND;
4808 case SECCLASS_DCCP_SOCKET:
4809 node_perm = DCCP_SOCKET__NODE_BIND;
4812 case SECCLASS_SCTP_SOCKET:
4813 node_perm = SCTP_SOCKET__NODE_BIND;
4817 node_perm = RAWIP_SOCKET__NODE_BIND;
4821 err = sel_netnode_sid(addrp, family_sa, &sid);
4825 if (family_sa == AF_INET)
4826 ad.u.net->v4info.saddr = addr4->sin_addr.s_addr;
4828 ad.u.net->v6info.saddr = addr6->sin6_addr;
4830 err = avc_has_perm(sksec->sid, sid,
4831 sksec->sclass, node_perm, &ad);
4838 /* Note that SCTP services expect -EINVAL, others -EAFNOSUPPORT. */
4839 if (sk->sk_protocol == IPPROTO_SCTP)
4841 return -EAFNOSUPPORT;
4844 /* This supports connect(2) and SCTP connect services such as sctp_connectx(3)
4845 * and sctp_sendmsg(3) as described in Documentation/security/SCTP.rst
4847 static int selinux_socket_connect_helper(struct socket *sock,
4848 struct sockaddr *address, int addrlen)
4850 struct sock *sk = sock->sk;
4851 struct sk_security_struct *sksec = selinux_sock(sk);
4854 err = sock_has_perm(sk, SOCKET__CONNECT);
4857 if (addrlen < offsetofend(struct sockaddr, sa_family))
4860 /* connect(AF_UNSPEC) has special handling, as it is a documented
4861 * way to disconnect the socket
4863 if (address->sa_family == AF_UNSPEC)
4867 * If a TCP, DCCP or SCTP socket, check name_connect permission
4870 if (sksec->sclass == SECCLASS_TCP_SOCKET ||
4871 sksec->sclass == SECCLASS_DCCP_SOCKET ||
4872 sksec->sclass == SECCLASS_SCTP_SOCKET) {
4873 struct common_audit_data ad;
4874 struct lsm_network_audit net = {0,};
4875 struct sockaddr_in *addr4 = NULL;
4876 struct sockaddr_in6 *addr6 = NULL;
4877 unsigned short snum;
4880 /* sctp_connectx(3) calls via selinux_sctp_bind_connect()
4881 * that validates multiple connect addresses. Because of this
4882 * need to check address->sa_family as it is possible to have
4883 * sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
4885 switch (address->sa_family) {
4887 addr4 = (struct sockaddr_in *)address;
4888 if (addrlen < sizeof(struct sockaddr_in))
4890 snum = ntohs(addr4->sin_port);
4893 addr6 = (struct sockaddr_in6 *)address;
4894 if (addrlen < SIN6_LEN_RFC2133)
4896 snum = ntohs(addr6->sin6_port);
4899 /* Note that SCTP services expect -EINVAL, whereas
4900 * others expect -EAFNOSUPPORT.
4902 if (sksec->sclass == SECCLASS_SCTP_SOCKET)
4905 return -EAFNOSUPPORT;
4908 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
4912 switch (sksec->sclass) {
4913 case SECCLASS_TCP_SOCKET:
4914 perm = TCP_SOCKET__NAME_CONNECT;
4916 case SECCLASS_DCCP_SOCKET:
4917 perm = DCCP_SOCKET__NAME_CONNECT;
4919 case SECCLASS_SCTP_SOCKET:
4920 perm = SCTP_SOCKET__NAME_CONNECT;
4924 ad.type = LSM_AUDIT_DATA_NET;
4926 ad.u.net->dport = htons(snum);
4927 ad.u.net->family = address->sa_family;
4928 err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad);
4936 /* Supports connect(2), see comments in selinux_socket_connect_helper() */
4937 static int selinux_socket_connect(struct socket *sock,
4938 struct sockaddr *address, int addrlen)
4941 struct sock *sk = sock->sk;
4943 err = selinux_socket_connect_helper(sock, address, addrlen);
4947 return selinux_netlbl_socket_connect(sk, address);
4950 static int selinux_socket_listen(struct socket *sock, int backlog)
4952 return sock_has_perm(sock->sk, SOCKET__LISTEN);
4955 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
4958 struct inode_security_struct *isec;
4959 struct inode_security_struct *newisec;
4963 err = sock_has_perm(sock->sk, SOCKET__ACCEPT);
4967 isec = inode_security_novalidate(SOCK_INODE(sock));
4968 spin_lock(&isec->lock);
4969 sclass = isec->sclass;
4971 spin_unlock(&isec->lock);
4973 newisec = inode_security_novalidate(SOCK_INODE(newsock));
4974 newisec->sclass = sclass;
4976 newisec->initialized = LABEL_INITIALIZED;
4981 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
4984 return sock_has_perm(sock->sk, SOCKET__WRITE);
4987 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4988 int size, int flags)
4990 return sock_has_perm(sock->sk, SOCKET__READ);
4993 static int selinux_socket_getsockname(struct socket *sock)
4995 return sock_has_perm(sock->sk, SOCKET__GETATTR);
4998 static int selinux_socket_getpeername(struct socket *sock)
5000 return sock_has_perm(sock->sk, SOCKET__GETATTR);
5003 static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
5007 err = sock_has_perm(sock->sk, SOCKET__SETOPT);
5011 return selinux_netlbl_socket_setsockopt(sock, level, optname);
5014 static int selinux_socket_getsockopt(struct socket *sock, int level,
5017 return sock_has_perm(sock->sk, SOCKET__GETOPT);
5020 static int selinux_socket_shutdown(struct socket *sock, int how)
5022 return sock_has_perm(sock->sk, SOCKET__SHUTDOWN);
5025 static int selinux_socket_unix_stream_connect(struct sock *sock,
5029 struct sk_security_struct *sksec_sock = selinux_sock(sock);
5030 struct sk_security_struct *sksec_other = selinux_sock(other);
5031 struct sk_security_struct *sksec_new = selinux_sock(newsk);
5032 struct common_audit_data ad;
5033 struct lsm_network_audit net;
5036 ad_net_init_from_sk(&ad, &net, other);
5038 err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
5039 sksec_other->sclass,
5040 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
5044 /* server child socket */
5045 sksec_new->peer_sid = sksec_sock->sid;
5046 err = security_sid_mls_copy(sksec_other->sid,
5047 sksec_sock->sid, &sksec_new->sid);
5051 /* connecting socket */
5052 sksec_sock->peer_sid = sksec_new->sid;
5057 static int selinux_socket_unix_may_send(struct socket *sock,
5058 struct socket *other)
5060 struct sk_security_struct *ssec = selinux_sock(sock->sk);
5061 struct sk_security_struct *osec = selinux_sock(other->sk);
5062 struct common_audit_data ad;
5063 struct lsm_network_audit net;
5065 ad_net_init_from_sk(&ad, &net, other->sk);
5067 return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
5071 static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
5072 char *addrp, u16 family, u32 peer_sid,
5073 struct common_audit_data *ad)
5079 err = sel_netif_sid(ns, ifindex, &if_sid);
5082 err = avc_has_perm(peer_sid, if_sid,
5083 SECCLASS_NETIF, NETIF__INGRESS, ad);
5087 err = sel_netnode_sid(addrp, family, &node_sid);
5090 return avc_has_perm(peer_sid, node_sid,
5091 SECCLASS_NODE, NODE__RECVFROM, ad);
5094 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
5098 struct sk_security_struct *sksec = selinux_sock(sk);
5099 u32 sk_sid = sksec->sid;
5100 struct common_audit_data ad;
5101 struct lsm_network_audit net;
5104 ad_net_init_from_iif(&ad, &net, skb->skb_iif, family);
5105 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
5109 if (selinux_secmark_enabled()) {
5110 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
5116 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
5119 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
5124 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
5126 int err, peerlbl_active, secmark_active;
5127 struct sk_security_struct *sksec = selinux_sock(sk);
5128 u16 family = sk->sk_family;
5129 u32 sk_sid = sksec->sid;
5130 struct common_audit_data ad;
5131 struct lsm_network_audit net;
5134 if (family != PF_INET && family != PF_INET6)
5137 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
5138 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
5141 /* If any sort of compatibility mode is enabled then handoff processing
5142 * to the selinux_sock_rcv_skb_compat() function to deal with the
5143 * special handling. We do this in an attempt to keep this function
5144 * as fast and as clean as possible. */
5145 if (!selinux_policycap_netpeer())
5146 return selinux_sock_rcv_skb_compat(sk, skb, family);
5148 secmark_active = selinux_secmark_enabled();
5149 peerlbl_active = selinux_peerlbl_enabled();
5150 if (!secmark_active && !peerlbl_active)
5153 ad_net_init_from_iif(&ad, &net, skb->skb_iif, family);
5154 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
5158 if (peerlbl_active) {
5161 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
5164 err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif,
5165 addrp, family, peer_sid, &ad);
5167 selinux_netlbl_err(skb, family, err, 0);
5170 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
5173 selinux_netlbl_err(skb, family, err, 0);
5178 if (secmark_active) {
5179 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
5188 static int selinux_socket_getpeersec_stream(struct socket *sock,
5189 sockptr_t optval, sockptr_t optlen,
5193 char *scontext = NULL;
5195 struct sk_security_struct *sksec = selinux_sock(sock->sk);
5196 u32 peer_sid = SECSID_NULL;
5198 if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
5199 sksec->sclass == SECCLASS_TCP_SOCKET ||
5200 sksec->sclass == SECCLASS_SCTP_SOCKET)
5201 peer_sid = sksec->peer_sid;
5202 if (peer_sid == SECSID_NULL)
5203 return -ENOPROTOOPT;
5205 err = security_sid_to_context(peer_sid, &scontext,
5209 if (scontext_len > len) {
5214 if (copy_to_sockptr(optval, scontext, scontext_len))
5217 if (copy_to_sockptr(optlen, &scontext_len, sizeof(scontext_len)))
5223 static int selinux_socket_getpeersec_dgram(struct socket *sock,
5224 struct sk_buff *skb, u32 *secid)
5226 u32 peer_secid = SECSID_NULL;
5229 if (skb && skb->protocol == htons(ETH_P_IP))
5231 else if (skb && skb->protocol == htons(ETH_P_IPV6))
5234 family = sock->sk->sk_family;
5236 *secid = SECSID_NULL;
5240 if (sock && family == PF_UNIX) {
5241 struct inode_security_struct *isec;
5242 isec = inode_security_novalidate(SOCK_INODE(sock));
5243 peer_secid = isec->sid;
5245 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
5247 *secid = peer_secid;
5248 if (peer_secid == SECSID_NULL)
5249 return -ENOPROTOOPT;
5253 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
5255 struct sk_security_struct *sksec = selinux_sock(sk);
5257 sksec->peer_sid = SECINITSID_UNLABELED;
5258 sksec->sid = SECINITSID_UNLABELED;
5259 sksec->sclass = SECCLASS_SOCKET;
5260 selinux_netlbl_sk_security_reset(sksec);
5265 static void selinux_sk_free_security(struct sock *sk)
5267 struct sk_security_struct *sksec = selinux_sock(sk);
5269 selinux_netlbl_sk_security_free(sksec);
5272 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
5274 struct sk_security_struct *sksec = selinux_sock(sk);
5275 struct sk_security_struct *newsksec = selinux_sock(newsk);
5277 newsksec->sid = sksec->sid;
5278 newsksec->peer_sid = sksec->peer_sid;
5279 newsksec->sclass = sksec->sclass;
5281 selinux_netlbl_sk_security_reset(newsksec);
5284 static void selinux_sk_getsecid(const struct sock *sk, u32 *secid)
5287 *secid = SECINITSID_ANY_SOCKET;
5289 const struct sk_security_struct *sksec = selinux_sock(sk);
5291 *secid = sksec->sid;
5295 static void selinux_sock_graft(struct sock *sk, struct socket *parent)
5297 struct inode_security_struct *isec =
5298 inode_security_novalidate(SOCK_INODE(parent));
5299 struct sk_security_struct *sksec = selinux_sock(sk);
5301 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
5302 sk->sk_family == PF_UNIX)
5303 isec->sid = sksec->sid;
5304 sksec->sclass = isec->sclass;
5308 * Determines peer_secid for the asoc and updates socket's peer label
5309 * if it's the first association on the socket.
5311 static int selinux_sctp_process_new_assoc(struct sctp_association *asoc,
5312 struct sk_buff *skb)
5314 struct sock *sk = asoc->base.sk;
5315 u16 family = sk->sk_family;
5316 struct sk_security_struct *sksec = selinux_sock(sk);
5317 struct common_audit_data ad;
5318 struct lsm_network_audit net;
5321 /* handle mapped IPv4 packets arriving via IPv6 sockets */
5322 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
5325 if (selinux_peerlbl_enabled()) {
5326 asoc->peer_secid = SECSID_NULL;
5328 /* This will return peer_sid = SECSID_NULL if there are
5329 * no peer labels, see security_net_peersid_resolve().
5331 err = selinux_skb_peerlbl_sid(skb, family, &asoc->peer_secid);
5335 if (asoc->peer_secid == SECSID_NULL)
5336 asoc->peer_secid = SECINITSID_UNLABELED;
5338 asoc->peer_secid = SECINITSID_UNLABELED;
5341 if (sksec->sctp_assoc_state == SCTP_ASSOC_UNSET) {
5342 sksec->sctp_assoc_state = SCTP_ASSOC_SET;
5344 /* Here as first association on socket. As the peer SID
5345 * was allowed by peer recv (and the netif/node checks),
5346 * then it is approved by policy and used as the primary
5347 * peer SID for getpeercon(3).
5349 sksec->peer_sid = asoc->peer_secid;
5350 } else if (sksec->peer_sid != asoc->peer_secid) {
5351 /* Other association peer SIDs are checked to enforce
5352 * consistency among the peer SIDs.
5354 ad_net_init_from_sk(&ad, &net, asoc->base.sk);
5355 err = avc_has_perm(sksec->peer_sid, asoc->peer_secid,
5356 sksec->sclass, SCTP_SOCKET__ASSOCIATION,
5364 /* Called whenever SCTP receives an INIT or COOKIE ECHO chunk. This
5365 * happens on an incoming connect(2), sctp_connectx(3) or
5366 * sctp_sendmsg(3) (with no association already present).
5368 static int selinux_sctp_assoc_request(struct sctp_association *asoc,
5369 struct sk_buff *skb)
5371 struct sk_security_struct *sksec = selinux_sock(asoc->base.sk);
5375 if (!selinux_policycap_extsockclass())
5378 err = selinux_sctp_process_new_assoc(asoc, skb);
5382 /* Compute the MLS component for the connection and store
5383 * the information in asoc. This will be used by SCTP TCP type
5384 * sockets and peeled off connections as they cause a new
5385 * socket to be generated. selinux_sctp_sk_clone() will then
5386 * plug this into the new socket.
5388 err = selinux_conn_sid(sksec->sid, asoc->peer_secid, &conn_sid);
5392 asoc->secid = conn_sid;
5394 /* Set any NetLabel labels including CIPSO/CALIPSO options. */
5395 return selinux_netlbl_sctp_assoc_request(asoc, skb);
5398 /* Called when SCTP receives a COOKIE ACK chunk as the final
5399 * response to an association request (initited by us).
5401 static int selinux_sctp_assoc_established(struct sctp_association *asoc,
5402 struct sk_buff *skb)
5404 struct sk_security_struct *sksec = selinux_sock(asoc->base.sk);
5406 if (!selinux_policycap_extsockclass())
5409 /* Inherit secid from the parent socket - this will be picked up
5410 * by selinux_sctp_sk_clone() if the association gets peeled off
5411 * into a new socket.
5413 asoc->secid = sksec->sid;
5415 return selinux_sctp_process_new_assoc(asoc, skb);
5418 /* Check if sctp IPv4/IPv6 addresses are valid for binding or connecting
5419 * based on their @optname.
5421 static int selinux_sctp_bind_connect(struct sock *sk, int optname,
5422 struct sockaddr *address,
5425 int len, err = 0, walk_size = 0;
5427 struct sockaddr *addr;
5428 struct socket *sock;
5430 if (!selinux_policycap_extsockclass())
5433 /* Process one or more addresses that may be IPv4 or IPv6 */
5434 sock = sk->sk_socket;
5437 while (walk_size < addrlen) {
5438 if (walk_size + sizeof(sa_family_t) > addrlen)
5442 switch (addr->sa_family) {
5445 len = sizeof(struct sockaddr_in);
5448 len = sizeof(struct sockaddr_in6);
5454 if (walk_size + len > addrlen)
5460 case SCTP_PRIMARY_ADDR:
5461 case SCTP_SET_PEER_PRIMARY_ADDR:
5462 case SCTP_SOCKOPT_BINDX_ADD:
5463 err = selinux_socket_bind(sock, addr, len);
5465 /* Connect checks */
5466 case SCTP_SOCKOPT_CONNECTX:
5467 case SCTP_PARAM_SET_PRIMARY:
5468 case SCTP_PARAM_ADD_IP:
5469 case SCTP_SENDMSG_CONNECT:
5470 err = selinux_socket_connect_helper(sock, addr, len);
5474 /* As selinux_sctp_bind_connect() is called by the
5475 * SCTP protocol layer, the socket is already locked,
5476 * therefore selinux_netlbl_socket_connect_locked()
5477 * is called here. The situations handled are:
5478 * sctp_connectx(3), sctp_sendmsg(3), sendmsg(2),
5479 * whenever a new IP address is added or when a new
5480 * primary address is selected.
5481 * Note that an SCTP connect(2) call happens before
5482 * the SCTP protocol layer and is handled via
5483 * selinux_socket_connect().
5485 err = selinux_netlbl_socket_connect_locked(sk, addr);
5499 /* Called whenever a new socket is created by accept(2) or sctp_peeloff(3). */
5500 static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
5503 struct sk_security_struct *sksec = selinux_sock(sk);
5504 struct sk_security_struct *newsksec = selinux_sock(newsk);
5506 /* If policy does not support SECCLASS_SCTP_SOCKET then call
5507 * the non-sctp clone version.
5509 if (!selinux_policycap_extsockclass())
5510 return selinux_sk_clone_security(sk, newsk);
5512 newsksec->sid = asoc->secid;
5513 newsksec->peer_sid = asoc->peer_secid;
5514 newsksec->sclass = sksec->sclass;
5515 selinux_netlbl_sctp_sk_clone(sk, newsk);
5518 static int selinux_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
5520 struct sk_security_struct *ssksec = selinux_sock(ssk);
5521 struct sk_security_struct *sksec = selinux_sock(sk);
5523 ssksec->sclass = sksec->sclass;
5524 ssksec->sid = sksec->sid;
5526 /* replace the existing subflow label deleting the existing one
5527 * and re-recreating a new label using the updated context
5529 selinux_netlbl_sk_security_free(ssksec);
5530 return selinux_netlbl_socket_post_create(ssk, ssk->sk_family);
5533 static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
5534 struct request_sock *req)
5536 struct sk_security_struct *sksec = selinux_sock(sk);
5538 u16 family = req->rsk_ops->family;
5542 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
5545 err = selinux_conn_sid(sksec->sid, peersid, &connsid);
5548 req->secid = connsid;
5549 req->peer_secid = peersid;
5551 return selinux_netlbl_inet_conn_request(req, family);
5554 static void selinux_inet_csk_clone(struct sock *newsk,
5555 const struct request_sock *req)
5557 struct sk_security_struct *newsksec = selinux_sock(newsk);
5559 newsksec->sid = req->secid;
5560 newsksec->peer_sid = req->peer_secid;
5561 /* NOTE: Ideally, we should also get the isec->sid for the
5562 new socket in sync, but we don't have the isec available yet.
5563 So we will wait until sock_graft to do it, by which
5564 time it will have been created and available. */
5566 /* We don't need to take any sort of lock here as we are the only
5567 * thread with access to newsksec */
5568 selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
5571 static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
5573 u16 family = sk->sk_family;
5574 struct sk_security_struct *sksec = selinux_sock(sk);
5576 /* handle mapped IPv4 packets arriving via IPv6 sockets */
5577 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
5580 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
5583 static int selinux_secmark_relabel_packet(u32 sid)
5585 return avc_has_perm(current_sid(), sid, SECCLASS_PACKET, PACKET__RELABELTO,
5589 static void selinux_secmark_refcount_inc(void)
5591 atomic_inc(&selinux_secmark_refcount);
5594 static void selinux_secmark_refcount_dec(void)
5596 atomic_dec(&selinux_secmark_refcount);
5599 static void selinux_req_classify_flow(const struct request_sock *req,
5600 struct flowi_common *flic)
5602 flic->flowic_secid = req->secid;
5605 static int selinux_tun_dev_alloc_security(void *security)
5607 struct tun_security_struct *tunsec = selinux_tun_dev(security);
5609 tunsec->sid = current_sid();
5613 static int selinux_tun_dev_create(void)
5615 u32 sid = current_sid();
5617 /* we aren't taking into account the "sockcreate" SID since the socket
5618 * that is being created here is not a socket in the traditional sense,
5619 * instead it is a private sock, accessible only to the kernel, and
5620 * representing a wide range of network traffic spanning multiple
5621 * connections unlike traditional sockets - check the TUN driver to
5622 * get a better understanding of why this socket is special */
5624 return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE,
5628 static int selinux_tun_dev_attach_queue(void *security)
5630 struct tun_security_struct *tunsec = selinux_tun_dev(security);
5632 return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET,
5633 TUN_SOCKET__ATTACH_QUEUE, NULL);
5636 static int selinux_tun_dev_attach(struct sock *sk, void *security)
5638 struct tun_security_struct *tunsec = selinux_tun_dev(security);
5639 struct sk_security_struct *sksec = selinux_sock(sk);
5641 /* we don't currently perform any NetLabel based labeling here and it
5642 * isn't clear that we would want to do so anyway; while we could apply
5643 * labeling without the support of the TUN user the resulting labeled
5644 * traffic from the other end of the connection would almost certainly
5645 * cause confusion to the TUN user that had no idea network labeling
5646 * protocols were being used */
5648 sksec->sid = tunsec->sid;
5649 sksec->sclass = SECCLASS_TUN_SOCKET;
5654 static int selinux_tun_dev_open(void *security)
5656 struct tun_security_struct *tunsec = selinux_tun_dev(security);
5657 u32 sid = current_sid();
5660 err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET,
5661 TUN_SOCKET__RELABELFROM, NULL);
5664 err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET,
5665 TUN_SOCKET__RELABELTO, NULL);
5673 #ifdef CONFIG_NETFILTER
5675 static unsigned int selinux_ip_forward(void *priv, struct sk_buff *skb,
5676 const struct nf_hook_state *state)
5682 struct common_audit_data ad;
5683 struct lsm_network_audit net;
5684 int secmark_active, peerlbl_active;
5686 if (!selinux_policycap_netpeer())
5689 secmark_active = selinux_secmark_enabled();
5690 peerlbl_active = selinux_peerlbl_enabled();
5691 if (!secmark_active && !peerlbl_active)
5695 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
5698 ifindex = state->in->ifindex;
5699 ad_net_init_from_iif(&ad, &net, ifindex, family);
5700 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
5703 if (peerlbl_active) {
5706 err = selinux_inet_sys_rcv_skb(state->net, ifindex,
5707 addrp, family, peer_sid, &ad);
5709 selinux_netlbl_err(skb, family, err, 1);
5715 if (avc_has_perm(peer_sid, skb->secmark,
5716 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
5719 if (netlbl_enabled())
5720 /* we do this in the FORWARD path and not the POST_ROUTING
5721 * path because we want to make sure we apply the necessary
5722 * labeling before IPsec is applied so we can leverage AH
5724 if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
5730 static unsigned int selinux_ip_output(void *priv, struct sk_buff *skb,
5731 const struct nf_hook_state *state)
5736 if (!netlbl_enabled())
5739 /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
5740 * because we want to make sure we apply the necessary labeling
5741 * before IPsec is applied so we can leverage AH protection */
5742 sk = sk_to_full_sk(skb->sk);
5744 struct sk_security_struct *sksec;
5746 if (sk_listener(sk))
5747 /* if the socket is the listening state then this
5748 * packet is a SYN-ACK packet which means it needs to
5749 * be labeled based on the connection/request_sock and
5750 * not the parent socket. unfortunately, we can't
5751 * lookup the request_sock yet as it isn't queued on
5752 * the parent socket until after the SYN-ACK is sent.
5753 * the "solution" is to simply pass the packet as-is
5754 * as any IP option based labeling should be copied
5755 * from the initial connection request (in the IP
5756 * layer). it is far from ideal, but until we get a
5757 * security label in the packet itself this is the
5758 * best we can do. */
5761 /* standard practice, label using the parent socket */
5762 sksec = selinux_sock(sk);
5765 sid = SECINITSID_KERNEL;
5766 if (selinux_netlbl_skbuff_setsid(skb, state->pf, sid) != 0)
5773 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
5774 const struct nf_hook_state *state)
5777 struct sk_security_struct *sksec;
5778 struct common_audit_data ad;
5779 struct lsm_network_audit net;
5782 sk = skb_to_full_sk(skb);
5785 sksec = selinux_sock(sk);
5787 ad_net_init_from_iif(&ad, &net, state->out->ifindex, state->pf);
5788 if (selinux_parse_skb(skb, &ad, NULL, 0, &proto))
5791 if (selinux_secmark_enabled())
5792 if (avc_has_perm(sksec->sid, skb->secmark,
5793 SECCLASS_PACKET, PACKET__SEND, &ad))
5794 return NF_DROP_ERR(-ECONNREFUSED);
5796 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
5797 return NF_DROP_ERR(-ECONNREFUSED);
5802 static unsigned int selinux_ip_postroute(void *priv,
5803 struct sk_buff *skb,
5804 const struct nf_hook_state *state)
5811 struct common_audit_data ad;
5812 struct lsm_network_audit net;
5814 int secmark_active, peerlbl_active;
5816 /* If any sort of compatibility mode is enabled then handoff processing
5817 * to the selinux_ip_postroute_compat() function to deal with the
5818 * special handling. We do this in an attempt to keep this function
5819 * as fast and as clean as possible. */
5820 if (!selinux_policycap_netpeer())
5821 return selinux_ip_postroute_compat(skb, state);
5823 secmark_active = selinux_secmark_enabled();
5824 peerlbl_active = selinux_peerlbl_enabled();
5825 if (!secmark_active && !peerlbl_active)
5828 sk = skb_to_full_sk(skb);
5831 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
5832 * packet transformation so allow the packet to pass without any checks
5833 * since we'll have another chance to perform access control checks
5834 * when the packet is on it's final way out.
5835 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
5836 * is NULL, in this case go ahead and apply access control.
5837 * NOTE: if this is a local socket (skb->sk != NULL) that is in the
5838 * TCP listening state we cannot wait until the XFRM processing
5839 * is done as we will miss out on the SA label if we do;
5840 * unfortunately, this means more work, but it is only once per
5842 if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL &&
5843 !(sk && sk_listener(sk)))
5849 /* Without an associated socket the packet is either coming
5850 * from the kernel or it is being forwarded; check the packet
5851 * to determine which and if the packet is being forwarded
5852 * query the packet directly to determine the security label. */
5854 secmark_perm = PACKET__FORWARD_OUT;
5855 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
5858 secmark_perm = PACKET__SEND;
5859 peer_sid = SECINITSID_KERNEL;
5861 } else if (sk_listener(sk)) {
5862 /* Locally generated packet but the associated socket is in the
5863 * listening state which means this is a SYN-ACK packet. In
5864 * this particular case the correct security label is assigned
5865 * to the connection/request_sock but unfortunately we can't
5866 * query the request_sock as it isn't queued on the parent
5867 * socket until after the SYN-ACK packet is sent; the only
5868 * viable choice is to regenerate the label like we do in
5869 * selinux_inet_conn_request(). See also selinux_ip_output()
5870 * for similar problems. */
5872 struct sk_security_struct *sksec;
5874 sksec = selinux_sock(sk);
5875 if (selinux_skb_peerlbl_sid(skb, family, &skb_sid))
5877 /* At this point, if the returned skb peerlbl is SECSID_NULL
5878 * and the packet has been through at least one XFRM
5879 * transformation then we must be dealing with the "final"
5880 * form of labeled IPsec packet; since we've already applied
5881 * all of our access controls on this packet we can safely
5882 * pass the packet. */
5883 if (skb_sid == SECSID_NULL) {
5886 if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
5890 if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
5894 return NF_DROP_ERR(-ECONNREFUSED);
5897 if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid))
5899 secmark_perm = PACKET__SEND;
5901 /* Locally generated packet, fetch the security label from the
5902 * associated socket. */
5903 struct sk_security_struct *sksec = selinux_sock(sk);
5904 peer_sid = sksec->sid;
5905 secmark_perm = PACKET__SEND;
5908 ifindex = state->out->ifindex;
5909 ad_net_init_from_iif(&ad, &net, ifindex, family);
5910 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
5914 if (avc_has_perm(peer_sid, skb->secmark,
5915 SECCLASS_PACKET, secmark_perm, &ad))
5916 return NF_DROP_ERR(-ECONNREFUSED);
5918 if (peerlbl_active) {
5922 if (sel_netif_sid(state->net, ifindex, &if_sid))
5924 if (avc_has_perm(peer_sid, if_sid,
5925 SECCLASS_NETIF, NETIF__EGRESS, &ad))
5926 return NF_DROP_ERR(-ECONNREFUSED);
5928 if (sel_netnode_sid(addrp, family, &node_sid))
5930 if (avc_has_perm(peer_sid, node_sid,
5931 SECCLASS_NODE, NODE__SENDTO, &ad))
5932 return NF_DROP_ERR(-ECONNREFUSED);
5937 #endif /* CONFIG_NETFILTER */
5939 static int nlmsg_sock_has_extended_perms(struct sock *sk, u32 perms, u16 nlmsg_type)
5941 struct sk_security_struct *sksec = sk->sk_security;
5942 struct common_audit_data ad;
5946 if (sock_skip_has_perm(sksec->sid))
5949 ad.type = LSM_AUDIT_DATA_NLMSGTYPE;
5950 ad.u.nlmsg_type = nlmsg_type;
5952 driver = nlmsg_type >> 8;
5953 xperm = nlmsg_type & 0xff;
5955 return avc_has_extended_perms(current_sid(), sksec->sid, sksec->sclass,
5956 perms, driver, AVC_EXT_NLMSG, xperm, &ad);
5959 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
5962 unsigned int msg_len;
5963 unsigned int data_len = skb->len;
5964 unsigned char *data = skb->data;
5965 struct nlmsghdr *nlh;
5966 struct sk_security_struct *sksec = selinux_sock(sk);
5967 u16 sclass = sksec->sclass;
5970 while (data_len >= nlmsg_total_size(0)) {
5971 nlh = (struct nlmsghdr *)data;
5973 /* NOTE: the nlmsg_len field isn't reliably set by some netlink
5974 * users which means we can't reject skb's with bogus
5975 * length fields; our solution is to follow what
5976 * netlink_rcv_skb() does and simply skip processing at
5977 * messages with length fields that are clearly junk
5979 if (nlh->nlmsg_len < NLMSG_HDRLEN || nlh->nlmsg_len > data_len)
5982 rc = selinux_nlmsg_lookup(sclass, nlh->nlmsg_type, &perm);
5984 if (selinux_policycap_netlink_xperm()) {
5985 rc = nlmsg_sock_has_extended_perms(
5986 sk, perm, nlh->nlmsg_type);
5988 rc = sock_has_perm(sk, perm);
5992 } else if (rc == -EINVAL) {
5993 /* -EINVAL is a missing msg/perm mapping */
5994 pr_warn_ratelimited("SELinux: unrecognized netlink"
5995 " message: protocol=%hu nlmsg_type=%hu sclass=%s"
5996 " pid=%d comm=%s\n",
5997 sk->sk_protocol, nlh->nlmsg_type,
5998 secclass_map[sclass - 1].name,
5999 task_pid_nr(current), current->comm);
6000 if (enforcing_enabled() &&
6001 !security_get_allow_unknown())
6004 } else if (rc == -ENOENT) {
6005 /* -ENOENT is a missing socket/class mapping, ignore */
6011 /* move to the next message after applying netlink padding */
6012 msg_len = NLMSG_ALIGN(nlh->nlmsg_len);
6013 if (msg_len >= data_len)
6015 data_len -= msg_len;
6022 static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass)
6024 isec->sclass = sclass;
6025 isec->sid = current_sid();
6028 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
6031 struct ipc_security_struct *isec;
6032 struct common_audit_data ad;
6033 u32 sid = current_sid();
6035 isec = selinux_ipc(ipc_perms);
6037 ad.type = LSM_AUDIT_DATA_IPC;
6038 ad.u.ipc_id = ipc_perms->key;
6040 return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
6043 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
6045 struct msg_security_struct *msec;
6047 msec = selinux_msg_msg(msg);
6048 msec->sid = SECINITSID_UNLABELED;
6053 /* message queue security operations */
6054 static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq)
6056 struct ipc_security_struct *isec;
6057 struct common_audit_data ad;
6058 u32 sid = current_sid();
6060 isec = selinux_ipc(msq);
6061 ipc_init_security(isec, SECCLASS_MSGQ);
6063 ad.type = LSM_AUDIT_DATA_IPC;
6064 ad.u.ipc_id = msq->key;
6066 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
6070 static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
6072 struct ipc_security_struct *isec;
6073 struct common_audit_data ad;
6074 u32 sid = current_sid();
6076 isec = selinux_ipc(msq);
6078 ad.type = LSM_AUDIT_DATA_IPC;
6079 ad.u.ipc_id = msq->key;
6081 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
6082 MSGQ__ASSOCIATE, &ad);
6085 static int selinux_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
6092 /* No specific object, just general system-wide information. */
6093 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
6094 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
6098 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
6101 perms = MSGQ__SETATTR;
6104 perms = MSGQ__DESTROY;
6110 return ipc_has_perm(msq, perms);
6113 static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg)
6115 struct ipc_security_struct *isec;
6116 struct msg_security_struct *msec;
6117 struct common_audit_data ad;
6118 u32 sid = current_sid();
6121 isec = selinux_ipc(msq);
6122 msec = selinux_msg_msg(msg);
6125 * First time through, need to assign label to the message
6127 if (msec->sid == SECINITSID_UNLABELED) {
6129 * Compute new sid based on current process and
6130 * message queue this message will be stored in
6132 rc = security_transition_sid(sid, isec->sid,
6133 SECCLASS_MSG, NULL, &msec->sid);
6138 ad.type = LSM_AUDIT_DATA_IPC;
6139 ad.u.ipc_id = msq->key;
6141 /* Can this process write to the queue? */
6142 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
6145 /* Can this process send the message */
6146 rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
6149 /* Can the message be put in the queue? */
6150 rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
6151 MSGQ__ENQUEUE, &ad);
6156 static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
6157 struct task_struct *target,
6158 long type, int mode)
6160 struct ipc_security_struct *isec;
6161 struct msg_security_struct *msec;
6162 struct common_audit_data ad;
6163 u32 sid = task_sid_obj(target);
6166 isec = selinux_ipc(msq);
6167 msec = selinux_msg_msg(msg);
6169 ad.type = LSM_AUDIT_DATA_IPC;
6170 ad.u.ipc_id = msq->key;
6172 rc = avc_has_perm(sid, isec->sid,
6173 SECCLASS_MSGQ, MSGQ__READ, &ad);
6175 rc = avc_has_perm(sid, msec->sid,
6176 SECCLASS_MSG, MSG__RECEIVE, &ad);
6180 /* Shared Memory security operations */
6181 static int selinux_shm_alloc_security(struct kern_ipc_perm *shp)
6183 struct ipc_security_struct *isec;
6184 struct common_audit_data ad;
6185 u32 sid = current_sid();
6187 isec = selinux_ipc(shp);
6188 ipc_init_security(isec, SECCLASS_SHM);
6190 ad.type = LSM_AUDIT_DATA_IPC;
6191 ad.u.ipc_id = shp->key;
6193 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
6197 static int selinux_shm_associate(struct kern_ipc_perm *shp, int shmflg)
6199 struct ipc_security_struct *isec;
6200 struct common_audit_data ad;
6201 u32 sid = current_sid();
6203 isec = selinux_ipc(shp);
6205 ad.type = LSM_AUDIT_DATA_IPC;
6206 ad.u.ipc_id = shp->key;
6208 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
6209 SHM__ASSOCIATE, &ad);
6212 /* Note, at this point, shp is locked down */
6213 static int selinux_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
6220 /* No specific object, just general system-wide information. */
6221 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
6222 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
6226 perms = SHM__GETATTR | SHM__ASSOCIATE;
6229 perms = SHM__SETATTR;
6236 perms = SHM__DESTROY;
6242 return ipc_has_perm(shp, perms);
6245 static int selinux_shm_shmat(struct kern_ipc_perm *shp,
6246 char __user *shmaddr, int shmflg)
6250 if (shmflg & SHM_RDONLY)
6253 perms = SHM__READ | SHM__WRITE;
6255 return ipc_has_perm(shp, perms);
6258 /* Semaphore security operations */
6259 static int selinux_sem_alloc_security(struct kern_ipc_perm *sma)
6261 struct ipc_security_struct *isec;
6262 struct common_audit_data ad;
6263 u32 sid = current_sid();
6265 isec = selinux_ipc(sma);
6266 ipc_init_security(isec, SECCLASS_SEM);
6268 ad.type = LSM_AUDIT_DATA_IPC;
6269 ad.u.ipc_id = sma->key;
6271 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
6275 static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg)
6277 struct ipc_security_struct *isec;
6278 struct common_audit_data ad;
6279 u32 sid = current_sid();
6281 isec = selinux_ipc(sma);
6283 ad.type = LSM_AUDIT_DATA_IPC;
6284 ad.u.ipc_id = sma->key;
6286 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
6287 SEM__ASSOCIATE, &ad);
6290 /* Note, at this point, sma is locked down */
6291 static int selinux_sem_semctl(struct kern_ipc_perm *sma, int cmd)
6299 /* No specific object, just general system-wide information. */
6300 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
6301 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
6305 perms = SEM__GETATTR;
6316 perms = SEM__DESTROY;
6319 perms = SEM__SETATTR;
6324 perms = SEM__GETATTR | SEM__ASSOCIATE;
6330 err = ipc_has_perm(sma, perms);
6334 static int selinux_sem_semop(struct kern_ipc_perm *sma,
6335 struct sembuf *sops, unsigned nsops, int alter)
6340 perms = SEM__READ | SEM__WRITE;
6344 return ipc_has_perm(sma, perms);
6347 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
6353 av |= IPC__UNIX_READ;
6355 av |= IPC__UNIX_WRITE;
6360 return ipc_has_perm(ipcp, av);
6363 static void selinux_ipc_getlsmprop(struct kern_ipc_perm *ipcp,
6364 struct lsm_prop *prop)
6366 struct ipc_security_struct *isec = selinux_ipc(ipcp);
6367 prop->selinux.secid = isec->sid;
6370 static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
6373 inode_doinit_with_dentry(inode, dentry);
6376 static int selinux_lsm_getattr(unsigned int attr, struct task_struct *p,
6379 const struct task_security_struct *tsec;
6385 tsec = selinux_cred(__task_cred(p));
6387 error = avc_has_perm(current_sid(), tsec->sid,
6388 SECCLASS_PROCESS, PROCESS__GETATTR, NULL);
6393 case LSM_ATTR_CURRENT:
6400 sid = tsec->exec_sid;
6402 case LSM_ATTR_FSCREATE:
6403 sid = tsec->create_sid;
6405 case LSM_ATTR_KEYCREATE:
6406 sid = tsec->keycreate_sid;
6408 case LSM_ATTR_SOCKCREATE:
6409 sid = tsec->sockcreate_sid;
6412 error = -EOPNOTSUPP;
6417 if (sid == SECSID_NULL) {
6422 error = security_sid_to_context(sid, value, &len);
6432 static int selinux_lsm_setattr(u64 attr, void *value, size_t size)
6434 struct task_security_struct *tsec;
6436 u32 mysid = current_sid(), sid = 0, ptsid;
6441 * Basic control over ability to set these attributes at all.
6445 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
6446 PROCESS__SETEXEC, NULL);
6448 case LSM_ATTR_FSCREATE:
6449 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
6450 PROCESS__SETFSCREATE, NULL);
6452 case LSM_ATTR_KEYCREATE:
6453 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
6454 PROCESS__SETKEYCREATE, NULL);
6456 case LSM_ATTR_SOCKCREATE:
6457 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
6458 PROCESS__SETSOCKCREATE, NULL);
6460 case LSM_ATTR_CURRENT:
6461 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
6462 PROCESS__SETCURRENT, NULL);
6465 error = -EOPNOTSUPP;
6471 /* Obtain a SID for the context, if one was specified. */
6472 if (size && str[0] && str[0] != '\n') {
6473 if (str[size-1] == '\n') {
6477 error = security_context_to_sid(value, size,
6479 if (error == -EINVAL && attr == LSM_ATTR_FSCREATE) {
6480 if (!has_cap_mac_admin(true)) {
6481 struct audit_buffer *ab;
6484 /* We strip a nul only if it is at the end,
6485 * otherwise the context contains a nul and
6486 * we should audit that */
6487 if (str[size - 1] == '\0')
6488 audit_size = size - 1;
6491 ab = audit_log_start(audit_context(),
6496 audit_log_format(ab, "op=fscreate invalid_context=");
6497 audit_log_n_untrustedstring(ab, value,
6503 error = security_context_to_sid_force(value, size,
6510 new = prepare_creds();
6514 /* Permission checking based on the specified context is
6515 performed during the actual operation (execve,
6516 open/mkdir/...), when we know the full context of the
6517 operation. See selinux_bprm_creds_for_exec for the execve
6518 checks and may_create for the file creation checks. The
6519 operation will then fail if the context is not permitted. */
6520 tsec = selinux_cred(new);
6521 if (attr == LSM_ATTR_EXEC) {
6522 tsec->exec_sid = sid;
6523 } else if (attr == LSM_ATTR_FSCREATE) {
6524 tsec->create_sid = sid;
6525 } else if (attr == LSM_ATTR_KEYCREATE) {
6527 error = avc_has_perm(mysid, sid,
6528 SECCLASS_KEY, KEY__CREATE, NULL);
6532 tsec->keycreate_sid = sid;
6533 } else if (attr == LSM_ATTR_SOCKCREATE) {
6534 tsec->sockcreate_sid = sid;
6535 } else if (attr == LSM_ATTR_CURRENT) {
6540 if (!current_is_single_threaded()) {
6541 error = security_bounded_transition(tsec->sid, sid);
6546 /* Check permissions for the transition. */
6547 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
6548 PROCESS__DYNTRANSITION, NULL);
6552 /* Check for ptracing, and update the task SID if ok.
6553 Otherwise, leave SID unchanged and fail. */
6554 ptsid = ptrace_parent_sid();
6556 error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
6557 PROCESS__PTRACE, NULL);
6577 * selinux_getselfattr - Get SELinux current task attributes
6578 * @attr: the requested attribute
6579 * @ctx: buffer to receive the result
6580 * @size: buffer size (input), buffer size used (output)
6583 * Fill the passed user space @ctx with the details of the requested
6586 * Returns the number of attributes on success, an error code otherwise.
6587 * There will only ever be one attribute.
6589 static int selinux_getselfattr(unsigned int attr, struct lsm_ctx __user *ctx,
6590 u32 *size, u32 flags)
6596 val_len = selinux_lsm_getattr(attr, current, &val);
6599 rc = lsm_fill_user_ctx(ctx, size, val, val_len, LSM_ID_SELINUX, 0);
6601 return (!rc ? 1 : rc);
6604 static int selinux_setselfattr(unsigned int attr, struct lsm_ctx *ctx,
6605 u32 size, u32 flags)
6609 rc = selinux_lsm_setattr(attr, ctx->ctx, ctx->ctx_len);
6615 static int selinux_getprocattr(struct task_struct *p,
6616 const char *name, char **value)
6618 unsigned int attr = lsm_name_to_attr(name);
6622 rc = selinux_lsm_getattr(attr, p, value);
6623 if (rc != -EOPNOTSUPP)
6630 static int selinux_setprocattr(const char *name, void *value, size_t size)
6632 int attr = lsm_name_to_attr(name);
6635 return selinux_lsm_setattr(attr, value, size);
6639 static int selinux_ismaclabel(const char *name)
6641 return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0);
6644 static int selinux_secid_to_secctx(u32 secid, struct lsm_context *cp)
6650 cp->id = LSM_ID_SELINUX;
6651 ret = security_sid_to_context(secid, &cp->context, &cp->len);
6656 ret = security_sid_to_context(secid, NULL, &seclen);
6662 static int selinux_lsmprop_to_secctx(struct lsm_prop *prop,
6663 struct lsm_context *cp)
6665 return selinux_secid_to_secctx(prop->selinux.secid, cp);
6668 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
6670 return security_context_to_sid(secdata, seclen,
6674 static void selinux_release_secctx(struct lsm_context *cp)
6676 if (cp->id == LSM_ID_SELINUX) {
6679 cp->id = LSM_ID_UNDEF;
6683 static void selinux_inode_invalidate_secctx(struct inode *inode)
6685 struct inode_security_struct *isec = selinux_inode(inode);
6687 spin_lock(&isec->lock);
6688 isec->initialized = LABEL_INVALID;
6689 spin_unlock(&isec->lock);
6693 * called with inode->i_mutex locked
6695 static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
6697 int rc = selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX,
6699 /* Do not return error when suppressing label (SBLABEL_MNT not set). */
6700 return rc == -EOPNOTSUPP ? 0 : rc;
6704 * called with inode->i_mutex locked
6706 static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
6708 return __vfs_setxattr_locked(&nop_mnt_idmap, dentry, XATTR_NAME_SELINUX,
6709 ctx, ctxlen, 0, NULL);
6712 static int selinux_inode_getsecctx(struct inode *inode, struct lsm_context *cp)
6715 len = selinux_inode_getsecurity(&nop_mnt_idmap, inode,
6716 XATTR_SELINUX_SUFFIX,
6717 (void **)&cp->context, true);
6721 cp->id = LSM_ID_SELINUX;
6726 static int selinux_key_alloc(struct key *k, const struct cred *cred,
6727 unsigned long flags)
6729 const struct task_security_struct *tsec;
6730 struct key_security_struct *ksec = selinux_key(k);
6732 tsec = selinux_cred(cred);
6733 if (tsec->keycreate_sid)
6734 ksec->sid = tsec->keycreate_sid;
6736 ksec->sid = tsec->sid;
6741 static int selinux_key_permission(key_ref_t key_ref,
6742 const struct cred *cred,
6743 enum key_need_perm need_perm)
6746 struct key_security_struct *ksec;
6749 switch (need_perm) {
6756 case KEY_NEED_WRITE:
6759 case KEY_NEED_SEARCH:
6765 case KEY_NEED_SETATTR:
6766 perm = KEY__SETATTR;
6768 case KEY_NEED_UNLINK:
6769 case KEY_SYSADMIN_OVERRIDE:
6770 case KEY_AUTHTOKEN_OVERRIDE:
6771 case KEY_DEFER_PERM_CHECK:
6779 sid = cred_sid(cred);
6780 key = key_ref_to_ptr(key_ref);
6781 ksec = selinux_key(key);
6783 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
6786 static int selinux_key_getsecurity(struct key *key, char **_buffer)
6788 struct key_security_struct *ksec = selinux_key(key);
6789 char *context = NULL;
6793 rc = security_sid_to_context(ksec->sid,
6801 #ifdef CONFIG_KEY_NOTIFICATIONS
6802 static int selinux_watch_key(struct key *key)
6804 struct key_security_struct *ksec = selinux_key(key);
6805 u32 sid = current_sid();
6807 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
6812 #ifdef CONFIG_SECURITY_INFINIBAND
6813 static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val)
6815 struct common_audit_data ad;
6818 struct ib_security_struct *sec = ib_sec;
6819 struct lsm_ibpkey_audit ibpkey;
6821 err = sel_ib_pkey_sid(subnet_prefix, pkey_val, &sid);
6825 ad.type = LSM_AUDIT_DATA_IBPKEY;
6826 ibpkey.subnet_prefix = subnet_prefix;
6827 ibpkey.pkey = pkey_val;
6828 ad.u.ibpkey = &ibpkey;
6829 return avc_has_perm(sec->sid, sid,
6830 SECCLASS_INFINIBAND_PKEY,
6831 INFINIBAND_PKEY__ACCESS, &ad);
6834 static int selinux_ib_endport_manage_subnet(void *ib_sec, const char *dev_name,
6837 struct common_audit_data ad;
6840 struct ib_security_struct *sec = ib_sec;
6841 struct lsm_ibendport_audit ibendport;
6843 err = security_ib_endport_sid(dev_name, port_num,
6849 ad.type = LSM_AUDIT_DATA_IBENDPORT;
6850 ibendport.dev_name = dev_name;
6851 ibendport.port = port_num;
6852 ad.u.ibendport = &ibendport;
6853 return avc_has_perm(sec->sid, sid,
6854 SECCLASS_INFINIBAND_ENDPORT,
6855 INFINIBAND_ENDPORT__MANAGE_SUBNET, &ad);
6858 static int selinux_ib_alloc_security(void *ib_sec)
6860 struct ib_security_struct *sec = selinux_ib(ib_sec);
6862 sec->sid = current_sid();
6867 #ifdef CONFIG_BPF_SYSCALL
6868 static int selinux_bpf(int cmd, union bpf_attr *attr,
6871 u32 sid = current_sid();
6875 case BPF_MAP_CREATE:
6876 ret = avc_has_perm(sid, sid, SECCLASS_BPF, BPF__MAP_CREATE,
6880 ret = avc_has_perm(sid, sid, SECCLASS_BPF, BPF__PROG_LOAD,
6891 static u32 bpf_map_fmode_to_av(fmode_t fmode)
6895 if (fmode & FMODE_READ)
6896 av |= BPF__MAP_READ;
6897 if (fmode & FMODE_WRITE)
6898 av |= BPF__MAP_WRITE;
6902 /* This function will check the file pass through unix socket or binder to see
6903 * if it is a bpf related object. And apply corresponding checks on the bpf
6904 * object based on the type. The bpf maps and programs, not like other files and
6905 * socket, are using a shared anonymous inode inside the kernel as their inode.
6906 * So checking that inode cannot identify if the process have privilege to
6907 * access the bpf object and that's why we have to add this additional check in
6908 * selinux_file_receive and selinux_binder_transfer_files.
6910 static int bpf_fd_pass(const struct file *file, u32 sid)
6912 struct bpf_security_struct *bpfsec;
6913 struct bpf_prog *prog;
6914 struct bpf_map *map;
6917 if (file->f_op == &bpf_map_fops) {
6918 map = file->private_data;
6919 bpfsec = map->security;
6920 ret = avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
6921 bpf_map_fmode_to_av(file->f_mode), NULL);
6924 } else if (file->f_op == &bpf_prog_fops) {
6925 prog = file->private_data;
6926 bpfsec = prog->aux->security;
6927 ret = avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
6928 BPF__PROG_RUN, NULL);
6935 static int selinux_bpf_map(struct bpf_map *map, fmode_t fmode)
6937 u32 sid = current_sid();
6938 struct bpf_security_struct *bpfsec;
6940 bpfsec = map->security;
6941 return avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
6942 bpf_map_fmode_to_av(fmode), NULL);
6945 static int selinux_bpf_prog(struct bpf_prog *prog)
6947 u32 sid = current_sid();
6948 struct bpf_security_struct *bpfsec;
6950 bpfsec = prog->aux->security;
6951 return avc_has_perm(sid, bpfsec->sid, SECCLASS_BPF,
6952 BPF__PROG_RUN, NULL);
6955 static int selinux_bpf_map_create(struct bpf_map *map, union bpf_attr *attr,
6956 struct bpf_token *token)
6958 struct bpf_security_struct *bpfsec;
6960 bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
6964 bpfsec->sid = current_sid();
6965 map->security = bpfsec;
6970 static void selinux_bpf_map_free(struct bpf_map *map)
6972 struct bpf_security_struct *bpfsec = map->security;
6974 map->security = NULL;
6978 static int selinux_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
6979 struct bpf_token *token)
6981 struct bpf_security_struct *bpfsec;
6983 bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
6987 bpfsec->sid = current_sid();
6988 prog->aux->security = bpfsec;
6993 static void selinux_bpf_prog_free(struct bpf_prog *prog)
6995 struct bpf_security_struct *bpfsec = prog->aux->security;
6997 prog->aux->security = NULL;
7001 static int selinux_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
7002 const struct path *path)
7004 struct bpf_security_struct *bpfsec;
7006 bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
7010 bpfsec->sid = current_sid();
7011 token->security = bpfsec;
7016 static void selinux_bpf_token_free(struct bpf_token *token)
7018 struct bpf_security_struct *bpfsec = token->security;
7020 token->security = NULL;
7025 struct lsm_blob_sizes selinux_blob_sizes __ro_after_init = {
7026 .lbs_cred = sizeof(struct task_security_struct),
7027 .lbs_file = sizeof(struct file_security_struct),
7028 .lbs_inode = sizeof(struct inode_security_struct),
7029 .lbs_ipc = sizeof(struct ipc_security_struct),
7030 .lbs_key = sizeof(struct key_security_struct),
7031 .lbs_msg_msg = sizeof(struct msg_security_struct),
7032 #ifdef CONFIG_PERF_EVENTS
7033 .lbs_perf_event = sizeof(struct perf_event_security_struct),
7035 .lbs_sock = sizeof(struct sk_security_struct),
7036 .lbs_superblock = sizeof(struct superblock_security_struct),
7037 .lbs_xattr_count = SELINUX_INODE_INIT_XATTRS,
7038 .lbs_tun_dev = sizeof(struct tun_security_struct),
7039 .lbs_ib = sizeof(struct ib_security_struct),
7042 #ifdef CONFIG_PERF_EVENTS
7043 static int selinux_perf_event_open(struct perf_event_attr *attr, int type)
7045 u32 requested, sid = current_sid();
7047 if (type == PERF_SECURITY_OPEN)
7048 requested = PERF_EVENT__OPEN;
7049 else if (type == PERF_SECURITY_CPU)
7050 requested = PERF_EVENT__CPU;
7051 else if (type == PERF_SECURITY_KERNEL)
7052 requested = PERF_EVENT__KERNEL;
7053 else if (type == PERF_SECURITY_TRACEPOINT)
7054 requested = PERF_EVENT__TRACEPOINT;
7058 return avc_has_perm(sid, sid, SECCLASS_PERF_EVENT,
7062 static int selinux_perf_event_alloc(struct perf_event *event)
7064 struct perf_event_security_struct *perfsec;
7066 perfsec = selinux_perf_event(event->security);
7067 perfsec->sid = current_sid();
7072 static int selinux_perf_event_read(struct perf_event *event)
7074 struct perf_event_security_struct *perfsec = event->security;
7075 u32 sid = current_sid();
7077 return avc_has_perm(sid, perfsec->sid,
7078 SECCLASS_PERF_EVENT, PERF_EVENT__READ, NULL);
7081 static int selinux_perf_event_write(struct perf_event *event)
7083 struct perf_event_security_struct *perfsec = event->security;
7084 u32 sid = current_sid();
7086 return avc_has_perm(sid, perfsec->sid,
7087 SECCLASS_PERF_EVENT, PERF_EVENT__WRITE, NULL);
7091 #ifdef CONFIG_IO_URING
7093 * selinux_uring_override_creds - check the requested cred override
7094 * @new: the target creds
7096 * Check to see if the current task is allowed to override it's credentials
7097 * to service an io_uring operation.
7099 static int selinux_uring_override_creds(const struct cred *new)
7101 return avc_has_perm(current_sid(), cred_sid(new),
7102 SECCLASS_IO_URING, IO_URING__OVERRIDE_CREDS, NULL);
7106 * selinux_uring_sqpoll - check if a io_uring polling thread can be created
7108 * Check to see if the current task is allowed to create a new io_uring
7109 * kernel polling thread.
7111 static int selinux_uring_sqpoll(void)
7113 u32 sid = current_sid();
7115 return avc_has_perm(sid, sid,
7116 SECCLASS_IO_URING, IO_URING__SQPOLL, NULL);
7120 * selinux_uring_cmd - check if IORING_OP_URING_CMD is allowed
7121 * @ioucmd: the io_uring command structure
7123 * Check to see if the current domain is allowed to execute an
7124 * IORING_OP_URING_CMD against the device/file specified in @ioucmd.
7127 static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
7129 struct file *file = ioucmd->file;
7130 struct inode *inode = file_inode(file);
7131 struct inode_security_struct *isec = selinux_inode(inode);
7132 struct common_audit_data ad;
7134 ad.type = LSM_AUDIT_DATA_FILE;
7137 return avc_has_perm(current_sid(), isec->sid,
7138 SECCLASS_IO_URING, IO_URING__CMD, &ad);
7140 #endif /* CONFIG_IO_URING */
7142 static const struct lsm_id selinux_lsmid = {
7144 .id = LSM_ID_SELINUX,
7148 * IMPORTANT NOTE: When adding new hooks, please be careful to keep this order:
7149 * 1. any hooks that don't belong to (2.) or (3.) below,
7150 * 2. hooks that both access structures allocated by other hooks, and allocate
7151 * structures that can be later accessed by other hooks (mostly "cloning"
7153 * 3. hooks that only allocate structures that can be later accessed by other
7154 * hooks ("allocating" hooks).
7156 * Please follow block comment delimiters in the list to keep this order.
7158 static struct security_hook_list selinux_hooks[] __ro_after_init = {
7159 LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr),
7160 LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction),
7161 LSM_HOOK_INIT(binder_transfer_binder, selinux_binder_transfer_binder),
7162 LSM_HOOK_INIT(binder_transfer_file, selinux_binder_transfer_file),
7164 LSM_HOOK_INIT(ptrace_access_check, selinux_ptrace_access_check),
7165 LSM_HOOK_INIT(ptrace_traceme, selinux_ptrace_traceme),
7166 LSM_HOOK_INIT(capget, selinux_capget),
7167 LSM_HOOK_INIT(capset, selinux_capset),
7168 LSM_HOOK_INIT(capable, selinux_capable),
7169 LSM_HOOK_INIT(quotactl, selinux_quotactl),
7170 LSM_HOOK_INIT(quota_on, selinux_quota_on),
7171 LSM_HOOK_INIT(syslog, selinux_syslog),
7172 LSM_HOOK_INIT(vm_enough_memory, selinux_vm_enough_memory),
7174 LSM_HOOK_INIT(netlink_send, selinux_netlink_send),
7176 LSM_HOOK_INIT(bprm_creds_for_exec, selinux_bprm_creds_for_exec),
7177 LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds),
7178 LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds),
7180 LSM_HOOK_INIT(sb_free_mnt_opts, selinux_free_mnt_opts),
7181 LSM_HOOK_INIT(sb_mnt_opts_compat, selinux_sb_mnt_opts_compat),
7182 LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
7183 LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
7184 LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
7185 LSM_HOOK_INIT(sb_statfs, selinux_sb_statfs),
7186 LSM_HOOK_INIT(sb_mount, selinux_mount),
7187 LSM_HOOK_INIT(sb_umount, selinux_umount),
7188 LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts),
7189 LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts),
7191 LSM_HOOK_INIT(move_mount, selinux_move_mount),
7193 LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
7194 LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
7196 LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),
7197 LSM_HOOK_INIT(inode_init_security, selinux_inode_init_security),
7198 LSM_HOOK_INIT(inode_init_security_anon, selinux_inode_init_security_anon),
7199 LSM_HOOK_INIT(inode_create, selinux_inode_create),
7200 LSM_HOOK_INIT(inode_link, selinux_inode_link),
7201 LSM_HOOK_INIT(inode_unlink, selinux_inode_unlink),
7202 LSM_HOOK_INIT(inode_symlink, selinux_inode_symlink),
7203 LSM_HOOK_INIT(inode_mkdir, selinux_inode_mkdir),
7204 LSM_HOOK_INIT(inode_rmdir, selinux_inode_rmdir),
7205 LSM_HOOK_INIT(inode_mknod, selinux_inode_mknod),
7206 LSM_HOOK_INIT(inode_rename, selinux_inode_rename),
7207 LSM_HOOK_INIT(inode_readlink, selinux_inode_readlink),
7208 LSM_HOOK_INIT(inode_follow_link, selinux_inode_follow_link),
7209 LSM_HOOK_INIT(inode_permission, selinux_inode_permission),
7210 LSM_HOOK_INIT(inode_setattr, selinux_inode_setattr),
7211 LSM_HOOK_INIT(inode_getattr, selinux_inode_getattr),
7212 LSM_HOOK_INIT(inode_xattr_skipcap, selinux_inode_xattr_skipcap),
7213 LSM_HOOK_INIT(inode_setxattr, selinux_inode_setxattr),
7214 LSM_HOOK_INIT(inode_post_setxattr, selinux_inode_post_setxattr),
7215 LSM_HOOK_INIT(inode_getxattr, selinux_inode_getxattr),
7216 LSM_HOOK_INIT(inode_listxattr, selinux_inode_listxattr),
7217 LSM_HOOK_INIT(inode_removexattr, selinux_inode_removexattr),
7218 LSM_HOOK_INIT(inode_set_acl, selinux_inode_set_acl),
7219 LSM_HOOK_INIT(inode_get_acl, selinux_inode_get_acl),
7220 LSM_HOOK_INIT(inode_remove_acl, selinux_inode_remove_acl),
7221 LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity),
7222 LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity),
7223 LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity),
7224 LSM_HOOK_INIT(inode_getlsmprop, selinux_inode_getlsmprop),
7225 LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
7226 LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr),
7227 LSM_HOOK_INIT(path_notify, selinux_path_notify),
7229 LSM_HOOK_INIT(kernfs_init_security, selinux_kernfs_init_security),
7231 LSM_HOOK_INIT(file_permission, selinux_file_permission),
7232 LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
7233 LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl),
7234 LSM_HOOK_INIT(file_ioctl_compat, selinux_file_ioctl_compat),
7235 LSM_HOOK_INIT(mmap_file, selinux_mmap_file),
7236 LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr),
7237 LSM_HOOK_INIT(file_mprotect, selinux_file_mprotect),
7238 LSM_HOOK_INIT(file_lock, selinux_file_lock),
7239 LSM_HOOK_INIT(file_fcntl, selinux_file_fcntl),
7240 LSM_HOOK_INIT(file_set_fowner, selinux_file_set_fowner),
7241 LSM_HOOK_INIT(file_send_sigiotask, selinux_file_send_sigiotask),
7242 LSM_HOOK_INIT(file_receive, selinux_file_receive),
7244 LSM_HOOK_INIT(file_open, selinux_file_open),
7246 LSM_HOOK_INIT(task_alloc, selinux_task_alloc),
7247 LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare),
7248 LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer),
7249 LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid),
7250 LSM_HOOK_INIT(cred_getlsmprop, selinux_cred_getlsmprop),
7251 LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as),
7252 LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as),
7253 LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request),
7254 LSM_HOOK_INIT(kernel_load_data, selinux_kernel_load_data),
7255 LSM_HOOK_INIT(kernel_read_file, selinux_kernel_read_file),
7256 LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid),
7257 LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid),
7258 LSM_HOOK_INIT(task_getsid, selinux_task_getsid),
7259 LSM_HOOK_INIT(current_getlsmprop_subj, selinux_current_getlsmprop_subj),
7260 LSM_HOOK_INIT(task_getlsmprop_obj, selinux_task_getlsmprop_obj),
7261 LSM_HOOK_INIT(task_setnice, selinux_task_setnice),
7262 LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio),
7263 LSM_HOOK_INIT(task_getioprio, selinux_task_getioprio),
7264 LSM_HOOK_INIT(task_prlimit, selinux_task_prlimit),
7265 LSM_HOOK_INIT(task_setrlimit, selinux_task_setrlimit),
7266 LSM_HOOK_INIT(task_setscheduler, selinux_task_setscheduler),
7267 LSM_HOOK_INIT(task_getscheduler, selinux_task_getscheduler),
7268 LSM_HOOK_INIT(task_movememory, selinux_task_movememory),
7269 LSM_HOOK_INIT(task_kill, selinux_task_kill),
7270 LSM_HOOK_INIT(task_to_inode, selinux_task_to_inode),
7271 LSM_HOOK_INIT(userns_create, selinux_userns_create),
7273 LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission),
7274 LSM_HOOK_INIT(ipc_getlsmprop, selinux_ipc_getlsmprop),
7276 LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate),
7277 LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl),
7278 LSM_HOOK_INIT(msg_queue_msgsnd, selinux_msg_queue_msgsnd),
7279 LSM_HOOK_INIT(msg_queue_msgrcv, selinux_msg_queue_msgrcv),
7281 LSM_HOOK_INIT(shm_associate, selinux_shm_associate),
7282 LSM_HOOK_INIT(shm_shmctl, selinux_shm_shmctl),
7283 LSM_HOOK_INIT(shm_shmat, selinux_shm_shmat),
7285 LSM_HOOK_INIT(sem_associate, selinux_sem_associate),
7286 LSM_HOOK_INIT(sem_semctl, selinux_sem_semctl),
7287 LSM_HOOK_INIT(sem_semop, selinux_sem_semop),
7289 LSM_HOOK_INIT(d_instantiate, selinux_d_instantiate),
7291 LSM_HOOK_INIT(getselfattr, selinux_getselfattr),
7292 LSM_HOOK_INIT(setselfattr, selinux_setselfattr),
7293 LSM_HOOK_INIT(getprocattr, selinux_getprocattr),
7294 LSM_HOOK_INIT(setprocattr, selinux_setprocattr),
7296 LSM_HOOK_INIT(ismaclabel, selinux_ismaclabel),
7297 LSM_HOOK_INIT(secctx_to_secid, selinux_secctx_to_secid),
7298 LSM_HOOK_INIT(release_secctx, selinux_release_secctx),
7299 LSM_HOOK_INIT(inode_invalidate_secctx, selinux_inode_invalidate_secctx),
7300 LSM_HOOK_INIT(inode_notifysecctx, selinux_inode_notifysecctx),
7301 LSM_HOOK_INIT(inode_setsecctx, selinux_inode_setsecctx),
7303 LSM_HOOK_INIT(unix_stream_connect, selinux_socket_unix_stream_connect),
7304 LSM_HOOK_INIT(unix_may_send, selinux_socket_unix_may_send),
7306 LSM_HOOK_INIT(socket_create, selinux_socket_create),
7307 LSM_HOOK_INIT(socket_post_create, selinux_socket_post_create),
7308 LSM_HOOK_INIT(socket_socketpair, selinux_socket_socketpair),
7309 LSM_HOOK_INIT(socket_bind, selinux_socket_bind),
7310 LSM_HOOK_INIT(socket_connect, selinux_socket_connect),
7311 LSM_HOOK_INIT(socket_listen, selinux_socket_listen),
7312 LSM_HOOK_INIT(socket_accept, selinux_socket_accept),
7313 LSM_HOOK_INIT(socket_sendmsg, selinux_socket_sendmsg),
7314 LSM_HOOK_INIT(socket_recvmsg, selinux_socket_recvmsg),
7315 LSM_HOOK_INIT(socket_getsockname, selinux_socket_getsockname),
7316 LSM_HOOK_INIT(socket_getpeername, selinux_socket_getpeername),
7317 LSM_HOOK_INIT(socket_getsockopt, selinux_socket_getsockopt),
7318 LSM_HOOK_INIT(socket_setsockopt, selinux_socket_setsockopt),
7319 LSM_HOOK_INIT(socket_shutdown, selinux_socket_shutdown),
7320 LSM_HOOK_INIT(socket_sock_rcv_skb, selinux_socket_sock_rcv_skb),
7321 LSM_HOOK_INIT(socket_getpeersec_stream,
7322 selinux_socket_getpeersec_stream),
7323 LSM_HOOK_INIT(socket_getpeersec_dgram, selinux_socket_getpeersec_dgram),
7324 LSM_HOOK_INIT(sk_free_security, selinux_sk_free_security),
7325 LSM_HOOK_INIT(sk_clone_security, selinux_sk_clone_security),
7326 LSM_HOOK_INIT(sk_getsecid, selinux_sk_getsecid),
7327 LSM_HOOK_INIT(sock_graft, selinux_sock_graft),
7328 LSM_HOOK_INIT(sctp_assoc_request, selinux_sctp_assoc_request),
7329 LSM_HOOK_INIT(sctp_sk_clone, selinux_sctp_sk_clone),
7330 LSM_HOOK_INIT(sctp_bind_connect, selinux_sctp_bind_connect),
7331 LSM_HOOK_INIT(sctp_assoc_established, selinux_sctp_assoc_established),
7332 LSM_HOOK_INIT(mptcp_add_subflow, selinux_mptcp_add_subflow),
7333 LSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request),
7334 LSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone),
7335 LSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established),
7336 LSM_HOOK_INIT(secmark_relabel_packet, selinux_secmark_relabel_packet),
7337 LSM_HOOK_INIT(secmark_refcount_inc, selinux_secmark_refcount_inc),
7338 LSM_HOOK_INIT(secmark_refcount_dec, selinux_secmark_refcount_dec),
7339 LSM_HOOK_INIT(req_classify_flow, selinux_req_classify_flow),
7340 LSM_HOOK_INIT(tun_dev_create, selinux_tun_dev_create),
7341 LSM_HOOK_INIT(tun_dev_attach_queue, selinux_tun_dev_attach_queue),
7342 LSM_HOOK_INIT(tun_dev_attach, selinux_tun_dev_attach),
7343 LSM_HOOK_INIT(tun_dev_open, selinux_tun_dev_open),
7344 #ifdef CONFIG_SECURITY_INFINIBAND
7345 LSM_HOOK_INIT(ib_pkey_access, selinux_ib_pkey_access),
7346 LSM_HOOK_INIT(ib_endport_manage_subnet,
7347 selinux_ib_endport_manage_subnet),
7349 #ifdef CONFIG_SECURITY_NETWORK_XFRM
7350 LSM_HOOK_INIT(xfrm_policy_free_security, selinux_xfrm_policy_free),
7351 LSM_HOOK_INIT(xfrm_policy_delete_security, selinux_xfrm_policy_delete),
7352 LSM_HOOK_INIT(xfrm_state_free_security, selinux_xfrm_state_free),
7353 LSM_HOOK_INIT(xfrm_state_delete_security, selinux_xfrm_state_delete),
7354 LSM_HOOK_INIT(xfrm_policy_lookup, selinux_xfrm_policy_lookup),
7355 LSM_HOOK_INIT(xfrm_state_pol_flow_match,
7356 selinux_xfrm_state_pol_flow_match),
7357 LSM_HOOK_INIT(xfrm_decode_session, selinux_xfrm_decode_session),
7361 LSM_HOOK_INIT(key_permission, selinux_key_permission),
7362 LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
7363 #ifdef CONFIG_KEY_NOTIFICATIONS
7364 LSM_HOOK_INIT(watch_key, selinux_watch_key),
7369 LSM_HOOK_INIT(audit_rule_known, selinux_audit_rule_known),
7370 LSM_HOOK_INIT(audit_rule_match, selinux_audit_rule_match),
7371 LSM_HOOK_INIT(audit_rule_free, selinux_audit_rule_free),
7374 #ifdef CONFIG_BPF_SYSCALL
7375 LSM_HOOK_INIT(bpf, selinux_bpf),
7376 LSM_HOOK_INIT(bpf_map, selinux_bpf_map),
7377 LSM_HOOK_INIT(bpf_prog, selinux_bpf_prog),
7378 LSM_HOOK_INIT(bpf_map_free, selinux_bpf_map_free),
7379 LSM_HOOK_INIT(bpf_prog_free, selinux_bpf_prog_free),
7380 LSM_HOOK_INIT(bpf_token_free, selinux_bpf_token_free),
7383 #ifdef CONFIG_PERF_EVENTS
7384 LSM_HOOK_INIT(perf_event_open, selinux_perf_event_open),
7385 LSM_HOOK_INIT(perf_event_read, selinux_perf_event_read),
7386 LSM_HOOK_INIT(perf_event_write, selinux_perf_event_write),
7389 #ifdef CONFIG_IO_URING
7390 LSM_HOOK_INIT(uring_override_creds, selinux_uring_override_creds),
7391 LSM_HOOK_INIT(uring_sqpoll, selinux_uring_sqpoll),
7392 LSM_HOOK_INIT(uring_cmd, selinux_uring_cmd),
7396 * PUT "CLONING" (ACCESSING + ALLOCATING) HOOKS HERE
7398 LSM_HOOK_INIT(fs_context_submount, selinux_fs_context_submount),
7399 LSM_HOOK_INIT(fs_context_dup, selinux_fs_context_dup),
7400 LSM_HOOK_INIT(fs_context_parse_param, selinux_fs_context_parse_param),
7401 LSM_HOOK_INIT(sb_eat_lsm_opts, selinux_sb_eat_lsm_opts),
7402 #ifdef CONFIG_SECURITY_NETWORK_XFRM
7403 LSM_HOOK_INIT(xfrm_policy_clone_security, selinux_xfrm_policy_clone),
7407 * PUT "ALLOCATING" HOOKS HERE
7409 LSM_HOOK_INIT(msg_msg_alloc_security, selinux_msg_msg_alloc_security),
7410 LSM_HOOK_INIT(msg_queue_alloc_security,
7411 selinux_msg_queue_alloc_security),
7412 LSM_HOOK_INIT(shm_alloc_security, selinux_shm_alloc_security),
7413 LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security),
7414 LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security),
7415 LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security),
7416 LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx),
7417 LSM_HOOK_INIT(lsmprop_to_secctx, selinux_lsmprop_to_secctx),
7418 LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx),
7419 LSM_HOOK_INIT(sk_alloc_security, selinux_sk_alloc_security),
7420 LSM_HOOK_INIT(tun_dev_alloc_security, selinux_tun_dev_alloc_security),
7421 #ifdef CONFIG_SECURITY_INFINIBAND
7422 LSM_HOOK_INIT(ib_alloc_security, selinux_ib_alloc_security),
7424 #ifdef CONFIG_SECURITY_NETWORK_XFRM
7425 LSM_HOOK_INIT(xfrm_policy_alloc_security, selinux_xfrm_policy_alloc),
7426 LSM_HOOK_INIT(xfrm_state_alloc, selinux_xfrm_state_alloc),
7427 LSM_HOOK_INIT(xfrm_state_alloc_acquire,
7428 selinux_xfrm_state_alloc_acquire),
7431 LSM_HOOK_INIT(key_alloc, selinux_key_alloc),
7434 LSM_HOOK_INIT(audit_rule_init, selinux_audit_rule_init),
7436 #ifdef CONFIG_BPF_SYSCALL
7437 LSM_HOOK_INIT(bpf_map_create, selinux_bpf_map_create),
7438 LSM_HOOK_INIT(bpf_prog_load, selinux_bpf_prog_load),
7439 LSM_HOOK_INIT(bpf_token_create, selinux_bpf_token_create),
7441 #ifdef CONFIG_PERF_EVENTS
7442 LSM_HOOK_INIT(perf_event_alloc, selinux_perf_event_alloc),
7446 static __init int selinux_init(void)
7448 pr_info("SELinux: Initializing.\n");
7450 memset(&selinux_state, 0, sizeof(selinux_state));
7451 enforcing_set(selinux_enforcing_boot);
7453 mutex_init(&selinux_state.status_lock);
7454 mutex_init(&selinux_state.policy_mutex);
7456 /* Set the security state for the initial task. */
7457 cred_init_security();
7459 default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
7460 if (!default_noexec)
7461 pr_notice("SELinux: virtual memory is executable by default\n");
7467 ebitmap_cache_init();
7469 hashtab_cache_init();
7471 security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks),
7474 if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
7475 panic("SELinux: Unable to register AVC netcache callback\n");
7477 if (avc_add_callback(selinux_lsm_notifier_avc_callback, AVC_CALLBACK_RESET))
7478 panic("SELinux: Unable to register AVC LSM notifier callback\n");
7480 if (selinux_enforcing_boot)
7481 pr_debug("SELinux: Starting in enforcing mode\n");
7483 pr_debug("SELinux: Starting in permissive mode\n");
7485 fs_validate_description("selinux", selinux_fs_parameters);
7490 static void delayed_superblock_init(struct super_block *sb, void *unused)
7492 selinux_set_mnt_opts(sb, NULL, 0, NULL);
7495 void selinux_complete_init(void)
7497 pr_debug("SELinux: Completing initialization.\n");
7499 /* Set up any superblocks initialized prior to the policy load. */
7500 pr_debug("SELinux: Setting up existing superblocks.\n");
7501 iterate_supers(delayed_superblock_init, NULL);
7504 /* SELinux requires early initialization in order to label
7505 all processes and objects when they are created. */
7506 DEFINE_LSM(selinux) = {
7508 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
7509 .enabled = &selinux_enabled_boot,
7510 .blobs = &selinux_blob_sizes,
7511 .init = selinux_init,
7514 #if defined(CONFIG_NETFILTER)
7515 static const struct nf_hook_ops selinux_nf_ops[] = {
7517 .hook = selinux_ip_postroute,
7519 .hooknum = NF_INET_POST_ROUTING,
7520 .priority = NF_IP_PRI_SELINUX_LAST,
7523 .hook = selinux_ip_forward,
7525 .hooknum = NF_INET_FORWARD,
7526 .priority = NF_IP_PRI_SELINUX_FIRST,
7529 .hook = selinux_ip_output,
7531 .hooknum = NF_INET_LOCAL_OUT,
7532 .priority = NF_IP_PRI_SELINUX_FIRST,
7534 #if IS_ENABLED(CONFIG_IPV6)
7536 .hook = selinux_ip_postroute,
7538 .hooknum = NF_INET_POST_ROUTING,
7539 .priority = NF_IP6_PRI_SELINUX_LAST,
7542 .hook = selinux_ip_forward,
7544 .hooknum = NF_INET_FORWARD,
7545 .priority = NF_IP6_PRI_SELINUX_FIRST,
7548 .hook = selinux_ip_output,
7550 .hooknum = NF_INET_LOCAL_OUT,
7551 .priority = NF_IP6_PRI_SELINUX_FIRST,
7556 static int __net_init selinux_nf_register(struct net *net)
7558 return nf_register_net_hooks(net, selinux_nf_ops,
7559 ARRAY_SIZE(selinux_nf_ops));
7562 static void __net_exit selinux_nf_unregister(struct net *net)
7564 nf_unregister_net_hooks(net, selinux_nf_ops,
7565 ARRAY_SIZE(selinux_nf_ops));
7568 static struct pernet_operations selinux_net_ops = {
7569 .init = selinux_nf_register,
7570 .exit = selinux_nf_unregister,
7573 static int __init selinux_nf_ip_init(void)
7577 if (!selinux_enabled_boot)
7580 pr_debug("SELinux: Registering netfilter hooks\n");
7582 err = register_pernet_subsys(&selinux_net_ops);
7584 panic("SELinux: register_pernet_subsys: error %d\n", err);
7588 __initcall(selinux_nf_ip_init);
7589 #endif /* CONFIG_NETFILTER */