X-Git-Url: https://repo.jachan.dev/linux.git/blobdiff_plain/4152dc91b5932e7fe49a5afed62a068b2f31d196..21c54b774744:/security/selinux/hooks.c

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index efeb1db8f61d..179dd20bec0a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1568,8 +1568,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 			/* Called from d_instantiate or d_splice_alias. */
 			dentry = dget(opt_dentry);
 		} else {
-			/* Called from selinux_complete_init, try to find a dentry. */
+			/*
+			 * Called from selinux_complete_init, try to find a dentry.
+			 * Some filesystems really want a connected one, so try
+			 * that first.  We could split SECURITY_FS_USE_XATTR in
+			 * two, depending upon that...
+			 */
 			dentry = d_find_alias(inode);
+			if (!dentry)
+				dentry = d_find_any_alias(inode);
 		}
 		if (!dentry) {
 			/*
@@ -1674,14 +1681,19 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 		if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) {
 			/* We must have a dentry to determine the label on
 			 * procfs inodes */
-			if (opt_dentry)
+			if (opt_dentry) {
 				/* Called from d_instantiate or
 				 * d_splice_alias. */
 				dentry = dget(opt_dentry);
-			else
+			} else {
 				/* Called from selinux_complete_init, try to
-				 * find a dentry. */
+				 * find a dentry.  Some filesystems really want
+				 * a connected one, so try that first.
+				 */
 				dentry = d_find_alias(inode);
+				if (!dentry)
+					dentry = d_find_any_alias(inode);
+			}
 			/*
 			 * This can be hit on boot when a file is accessed
 			 * before the policy is loaded.  When we load policy we
@@ -3947,6 +3959,11 @@ static void selinux_cred_transfer(struct cred *new, const struct cred *old)
 	*tsec = *old_tsec;
 }
 
+static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
+{
+	*secid = cred_sid(c);
+}
+
 /*
  * set the security data for a kernel service
  * - all the creation contexts are set to unlabelled
@@ -4156,16 +4173,19 @@ static int selinux_task_movememory(struct task_struct *p)
 }
 
 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
-				int sig, u32 secid)
+				int sig, const struct cred *cred)
 {
+	u32 secid;
 	u32 perm;
 
 	if (!sig)
 		perm = PROCESS__SIGNULL; /* null signal; existence test */
 	else
 		perm = signal_to_av(sig);
-	if (!secid)
+	if (!cred)
 		secid = current_sid();
+	else
+		secid = cred_sid(cred);
 	return avc_has_perm(&selinux_state,
 			    secid, task_sid(p), SECCLASS_PROCESS, perm, NULL);
 }
@@ -5943,54 +5963,54 @@ static void selinux_msg_msg_free_security(struct msg_msg *msg)
 }
 
 /* message queue security operations */
-static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
+static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(&msq->q_perm, SECCLASS_MSGQ);
+	rc = ipc_alloc_security(msq, SECCLASS_MSGQ);
 	if (rc)
 		return rc;
 
-	isec = msq->q_perm.security;
+	isec = msq->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = msq->q_perm.key;
+	ad.u.ipc_id = msq->key;
 
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_MSGQ,
 			  MSGQ__CREATE, &ad);
 	if (rc) {
-		ipc_free_security(&msq->q_perm);
+		ipc_free_security(msq);
 		return rc;
 	}
 	return 0;
 }
 
-static void selinux_msg_queue_free_security(struct msg_queue *msq)
+static void selinux_msg_queue_free_security(struct kern_ipc_perm *msq)
 {
-	ipc_free_security(&msq->q_perm);
+	ipc_free_security(msq);
 }
 
-static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
+static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = msq->q_perm.security;
+	isec = msq->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = msq->q_perm.key;
+	ad.u.ipc_id = msq->key;
 
 	return avc_has_perm(&selinux_state,
 			    sid, isec->sid, SECCLASS_MSGQ,
 			    MSGQ__ASSOCIATE, &ad);
 }
 
-static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
+static int selinux_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
 {
 	int err;
 	int perms;
@@ -6004,6 +6024,7 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
 				    SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
 	case IPC_STAT:
 	case MSG_STAT:
+	case MSG_STAT_ANY:
 		perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
 		break;
 	case IPC_SET:
@@ -6016,11 +6037,11 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
 		return 0;
 	}
 
-	err = ipc_has_perm(&msq->q_perm, perms);
+	err = ipc_has_perm(msq, perms);
 	return err;
 }
 
-static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
+static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg)
 {
 	struct ipc_security_struct *isec;
 	struct msg_security_struct *msec;
@@ -6028,7 +6049,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
 	u32 sid = current_sid();
 	int rc;
 
-	isec = msq->q_perm.security;
+	isec = msq->security;
 	msec = msg->security;
 
 	/*
@@ -6046,7 +6067,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
 	}
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = msq->q_perm.key;
+	ad.u.ipc_id = msq->key;
 
 	/* Can this process write to the queue? */
 	rc = avc_has_perm(&selinux_state,
@@ -6066,7 +6087,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
 	return rc;
 }
 
-static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
+static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
 				    struct task_struct *target,
 				    long type, int mode)
 {
@@ -6076,11 +6097,11 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
 	u32 sid = task_sid(target);
 	int rc;
 
-	isec = msq->q_perm.security;
+	isec = msq->security;
 	msec = msg->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = msq->q_perm.key;
+	ad.u.ipc_id = msq->key;
 
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid,
@@ -6093,47 +6114,47 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
 }
 
 /* Shared Memory security operations */
-static int selinux_shm_alloc_security(struct shmid_kernel *shp)
+static int selinux_shm_alloc_security(struct kern_ipc_perm *shp)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(&shp->shm_perm, SECCLASS_SHM);
+	rc = ipc_alloc_security(shp, SECCLASS_SHM);
 	if (rc)
 		return rc;
 
-	isec = shp->shm_perm.security;
+	isec = shp->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = shp->shm_perm.key;
+	ad.u.ipc_id = shp->key;
 
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_SHM,
 			  SHM__CREATE, &ad);
 	if (rc) {
-		ipc_free_security(&shp->shm_perm);
+		ipc_free_security(shp);
 		return rc;
 	}
 	return 0;
 }
 
-static void selinux_shm_free_security(struct shmid_kernel *shp)
+static void selinux_shm_free_security(struct kern_ipc_perm *shp)
 {
-	ipc_free_security(&shp->shm_perm);
+	ipc_free_security(shp);
 }
 
-static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
+static int selinux_shm_associate(struct kern_ipc_perm *shp, int shmflg)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = shp->shm_perm.security;
+	isec = shp->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = shp->shm_perm.key;
+	ad.u.ipc_id = shp->key;
 
 	return avc_has_perm(&selinux_state,
 			    sid, isec->sid, SECCLASS_SHM,
@@ -6141,7 +6162,7 @@ static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
 }
 
 /* Note, at this point, shp is locked down */
-static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
+static int selinux_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
 {
 	int perms;
 	int err;
@@ -6155,6 +6176,7 @@ static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
 				    SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
 	case IPC_STAT:
 	case SHM_STAT:
+	case SHM_STAT_ANY:
 		perms = SHM__GETATTR | SHM__ASSOCIATE;
 		break;
 	case IPC_SET:
@@ -6171,11 +6193,11 @@ static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
 		return 0;
 	}
 
-	err = ipc_has_perm(&shp->shm_perm, perms);
+	err = ipc_has_perm(shp, perms);
 	return err;
 }
 
-static int selinux_shm_shmat(struct shmid_kernel *shp,
+static int selinux_shm_shmat(struct kern_ipc_perm *shp,
 			     char __user *shmaddr, int shmflg)
 {
 	u32 perms;
@@ -6185,51 +6207,51 @@ static int selinux_shm_shmat(struct shmid_kernel *shp,
 	else
 		perms = SHM__READ | SHM__WRITE;
 
-	return ipc_has_perm(&shp->shm_perm, perms);
+	return ipc_has_perm(shp, perms);
 }
 
 /* Semaphore security operations */
-static int selinux_sem_alloc_security(struct sem_array *sma)
+static int selinux_sem_alloc_security(struct kern_ipc_perm *sma)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(&sma->sem_perm, SECCLASS_SEM);
+	rc = ipc_alloc_security(sma, SECCLASS_SEM);
 	if (rc)
 		return rc;
 
-	isec = sma->sem_perm.security;
+	isec = sma->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = sma->sem_perm.key;
+	ad.u.ipc_id = sma->key;
 
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_SEM,
 			  SEM__CREATE, &ad);
 	if (rc) {
-		ipc_free_security(&sma->sem_perm);
+		ipc_free_security(sma);
 		return rc;
 	}
 	return 0;
 }
 
-static void selinux_sem_free_security(struct sem_array *sma)
+static void selinux_sem_free_security(struct kern_ipc_perm *sma)
 {
-	ipc_free_security(&sma->sem_perm);
+	ipc_free_security(sma);
 }
 
-static int selinux_sem_associate(struct sem_array *sma, int semflg)
+static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg)
 {
 	struct ipc_security_struct *isec;
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = sma->sem_perm.security;
+	isec = sma->security;
 
 	ad.type = LSM_AUDIT_DATA_IPC;
-	ad.u.ipc_id = sma->sem_perm.key;
+	ad.u.ipc_id = sma->key;
 
 	return avc_has_perm(&selinux_state,
 			    sid, isec->sid, SECCLASS_SEM,
@@ -6237,7 +6259,7 @@ static int selinux_sem_associate(struct sem_array *sma, int semflg)
 }
 
 /* Note, at this point, sma is locked down */
-static int selinux_sem_semctl(struct sem_array *sma, int cmd)
+static int selinux_sem_semctl(struct kern_ipc_perm *sma, int cmd)
 {
 	int err;
 	u32 perms;
@@ -6270,17 +6292,18 @@ static int selinux_sem_semctl(struct sem_array *sma, int cmd)
 		break;
 	case IPC_STAT:
 	case SEM_STAT:
+	case SEM_STAT_ANY:
 		perms = SEM__GETATTR | SEM__ASSOCIATE;
 		break;
 	default:
 		return 0;
 	}
 
-	err = ipc_has_perm(&sma->sem_perm, perms);
+	err = ipc_has_perm(sma, perms);
 	return err;
 }
 
-static int selinux_sem_semop(struct sem_array *sma,
+static int selinux_sem_semop(struct kern_ipc_perm *sma,
 			     struct sembuf *sops, unsigned nsops, int alter)
 {
 	u32 perms;
@@ -6290,7 +6313,7 @@ static int selinux_sem_semop(struct sem_array *sma,
 	else
 		perms = SEM__READ;
 
-	return ipc_has_perm(&sma->sem_perm, perms);
+	return ipc_has_perm(sma, perms);
 }
 
 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
@@ -6929,6 +6952,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(cred_free, selinux_cred_free),
 	LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare),
 	LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer),
+	LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid),
 	LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as),
 	LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as),
 	LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request),