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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a5494dcd EB |
2 | /* |
3 | * Copyright (C) 2007 | |
4 | * | |
5 | * Author: Eric Biederman <ebiederm@xmision.com> | |
a5494dcd EB |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/ipc.h> | |
10 | #include <linux/nsproxy.h> | |
11 | #include <linux/sysctl.h> | |
12 | #include <linux/uaccess.h> | |
5563cabd | 13 | #include <linux/capability.h> |
ae5e1b22 | 14 | #include <linux/ipc_namespace.h> |
6546bc42 | 15 | #include <linux/msg.h> |
1f5c135e | 16 | #include <linux/slab.h> |
50ec499b | 17 | #include <linux/cred.h> |
6546bc42 | 18 | #include "util.h" |
a5494dcd | 19 | |
78eb4ea2 | 20 | static int proc_ipc_dointvec_minmax_orphans(const struct ctl_table *table, int write, |
32927393 | 21 | void *buffer, size_t *lenp, loff_t *ppos) |
b34a6b1d | 22 | { |
dd141a49 AG |
23 | struct ipc_namespace *ns = |
24 | container_of(table->data, struct ipc_namespace, shm_rmid_forced); | |
1f5c135e | 25 | int err; |
b34a6b1d | 26 | |
dd141a49 | 27 | err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
b34a6b1d VK |
28 | |
29 | if (err < 0) | |
30 | return err; | |
31 | if (ns->shm_rmid_forced) | |
32 | shm_destroy_orphaned(ns); | |
33 | return err; | |
34 | } | |
35 | ||
78eb4ea2 | 36 | static int proc_ipc_auto_msgmni(const struct ctl_table *table, int write, |
32927393 | 37 | void *buffer, size_t *lenp, loff_t *ppos) |
9eefe520 ND |
38 | { |
39 | struct ctl_table ipc_table; | |
0050ee05 | 40 | int dummy = 0; |
9eefe520 ND |
41 | |
42 | memcpy(&ipc_table, table, sizeof(ipc_table)); | |
0050ee05 MS |
43 | ipc_table.data = &dummy; |
44 | ||
45 | if (write) | |
46 | pr_info_once("writing to auto_msgmni has no effect"); | |
47 | ||
48 | return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos); | |
9eefe520 ND |
49 | } |
50 | ||
78eb4ea2 | 51 | static int proc_ipc_sem_dointvec(const struct ctl_table *table, int write, |
fff1662c | 52 | void *buffer, size_t *lenp, loff_t *ppos) |
8c81ddd2 | 53 | { |
dd141a49 AG |
54 | struct ipc_namespace *ns = |
55 | container_of(table->data, struct ipc_namespace, sem_ctls); | |
8c81ddd2 | 56 | int ret, semmni; |
1f5c135e | 57 | |
8c81ddd2 | 58 | semmni = ns->sem_ctls[3]; |
1f5c135e | 59 | ret = proc_dointvec(table, write, buffer, lenp, ppos); |
8c81ddd2 WL |
60 | |
61 | if (!ret) | |
def7343f | 62 | ret = sem_check_semmni(ns); |
8c81ddd2 WL |
63 | |
64 | /* | |
65 | * Reset the semmni value if an error happens. | |
66 | */ | |
67 | if (ret) | |
68 | ns->sem_ctls[3] = semmni; | |
69 | return ret; | |
70 | } | |
71 | ||
5ac893b8 WL |
72 | int ipc_mni = IPCMNI; |
73 | int ipc_mni_shift = IPCMNI_SHIFT; | |
99db46ea | 74 | int ipc_min_cycle = RADIX_TREE_MAP_SIZE; |
9eefe520 | 75 | |
1f5c135e | 76 | static struct ctl_table ipc_sysctls[] = { |
a5494dcd | 77 | { |
a5494dcd EB |
78 | .procname = "shmmax", |
79 | .data = &init_ipc_ns.shm_ctlmax, | |
239521f3 | 80 | .maxlen = sizeof(init_ipc_ns.shm_ctlmax), |
a5494dcd | 81 | .mode = 0644, |
1f5c135e | 82 | .proc_handler = proc_doulongvec_minmax, |
a5494dcd EB |
83 | }, |
84 | { | |
a5494dcd EB |
85 | .procname = "shmall", |
86 | .data = &init_ipc_ns.shm_ctlall, | |
239521f3 | 87 | .maxlen = sizeof(init_ipc_ns.shm_ctlall), |
a5494dcd | 88 | .mode = 0644, |
1f5c135e | 89 | .proc_handler = proc_doulongvec_minmax, |
a5494dcd EB |
90 | }, |
91 | { | |
a5494dcd EB |
92 | .procname = "shmmni", |
93 | .data = &init_ipc_ns.shm_ctlmni, | |
239521f3 | 94 | .maxlen = sizeof(init_ipc_ns.shm_ctlmni), |
a5494dcd | 95 | .mode = 0644, |
1f5c135e | 96 | .proc_handler = proc_dointvec_minmax, |
eec4844f | 97 | .extra1 = SYSCTL_ZERO, |
6730e658 | 98 | .extra2 = &ipc_mni, |
a5494dcd | 99 | }, |
b34a6b1d VK |
100 | { |
101 | .procname = "shm_rmid_forced", | |
102 | .data = &init_ipc_ns.shm_rmid_forced, | |
103 | .maxlen = sizeof(init_ipc_ns.shm_rmid_forced), | |
104 | .mode = 0644, | |
105 | .proc_handler = proc_ipc_dointvec_minmax_orphans, | |
dd141a49 AG |
106 | .extra1 = SYSCTL_ZERO, |
107 | .extra2 = SYSCTL_ONE, | |
b34a6b1d | 108 | }, |
a5494dcd | 109 | { |
a5494dcd EB |
110 | .procname = "msgmax", |
111 | .data = &init_ipc_ns.msg_ctlmax, | |
239521f3 | 112 | .maxlen = sizeof(init_ipc_ns.msg_ctlmax), |
a5494dcd | 113 | .mode = 0644, |
1f5c135e | 114 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
115 | .extra1 = SYSCTL_ZERO, |
116 | .extra2 = SYSCTL_INT_MAX, | |
a5494dcd EB |
117 | }, |
118 | { | |
a5494dcd EB |
119 | .procname = "msgmni", |
120 | .data = &init_ipc_ns.msg_ctlmni, | |
239521f3 | 121 | .maxlen = sizeof(init_ipc_ns.msg_ctlmni), |
a5494dcd | 122 | .mode = 0644, |
1f5c135e | 123 | .proc_handler = proc_dointvec_minmax, |
eec4844f | 124 | .extra1 = SYSCTL_ZERO, |
6730e658 | 125 | .extra2 = &ipc_mni, |
a5494dcd | 126 | }, |
0050ee05 MS |
127 | { |
128 | .procname = "auto_msgmni", | |
129 | .data = NULL, | |
130 | .maxlen = sizeof(int), | |
131 | .mode = 0644, | |
132 | .proc_handler = proc_ipc_auto_msgmni, | |
eec4844f MC |
133 | .extra1 = SYSCTL_ZERO, |
134 | .extra2 = SYSCTL_ONE, | |
0050ee05 | 135 | }, |
a5494dcd | 136 | { |
a5494dcd EB |
137 | .procname = "msgmnb", |
138 | .data = &init_ipc_ns.msg_ctlmnb, | |
239521f3 | 139 | .maxlen = sizeof(init_ipc_ns.msg_ctlmnb), |
a5494dcd | 140 | .mode = 0644, |
1f5c135e | 141 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
142 | .extra1 = SYSCTL_ZERO, |
143 | .extra2 = SYSCTL_INT_MAX, | |
a5494dcd EB |
144 | }, |
145 | { | |
a5494dcd EB |
146 | .procname = "sem", |
147 | .data = &init_ipc_ns.sem_ctls, | |
239521f3 | 148 | .maxlen = 4*sizeof(int), |
a5494dcd | 149 | .mode = 0644, |
8c81ddd2 | 150 | .proc_handler = proc_ipc_sem_dointvec, |
a5494dcd | 151 | }, |
03f59566 SK |
152 | #ifdef CONFIG_CHECKPOINT_RESTORE |
153 | { | |
154 | .procname = "sem_next_id", | |
155 | .data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id, | |
156 | .maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id), | |
0889f44e AG |
157 | .mode = 0444, |
158 | .proc_handler = proc_dointvec_minmax, | |
159 | .extra1 = SYSCTL_ZERO, | |
160 | .extra2 = SYSCTL_INT_MAX, | |
03f59566 SK |
161 | }, |
162 | { | |
163 | .procname = "msg_next_id", | |
164 | .data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id, | |
165 | .maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id), | |
0889f44e AG |
166 | .mode = 0444, |
167 | .proc_handler = proc_dointvec_minmax, | |
168 | .extra1 = SYSCTL_ZERO, | |
169 | .extra2 = SYSCTL_INT_MAX, | |
03f59566 SK |
170 | }, |
171 | { | |
172 | .procname = "shm_next_id", | |
173 | .data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id, | |
174 | .maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id), | |
0889f44e AG |
175 | .mode = 0444, |
176 | .proc_handler = proc_dointvec_minmax, | |
177 | .extra1 = SYSCTL_ZERO, | |
178 | .extra2 = SYSCTL_INT_MAX, | |
03f59566 SK |
179 | }, |
180 | #endif | |
a5494dcd EB |
181 | }; |
182 | ||
1f5c135e AG |
183 | static struct ctl_table_set *set_lookup(struct ctl_table_root *root) |
184 | { | |
185 | return ¤t->nsproxy->ipc_ns->ipc_set; | |
186 | } | |
187 | ||
188 | static int set_is_seen(struct ctl_table_set *set) | |
189 | { | |
190 | return ¤t->nsproxy->ipc_ns->ipc_set == set; | |
191 | } | |
192 | ||
50ec499b | 193 | static void ipc_set_ownership(struct ctl_table_header *head, |
50ec499b AG |
194 | kuid_t *uid, kgid_t *gid) |
195 | { | |
196 | struct ipc_namespace *ns = | |
197 | container_of(head->set, struct ipc_namespace, ipc_set); | |
198 | ||
199 | kuid_t ns_root_uid = make_kuid(ns->user_ns, 0); | |
200 | kgid_t ns_root_gid = make_kgid(ns->user_ns, 0); | |
201 | ||
202 | *uid = uid_valid(ns_root_uid) ? ns_root_uid : GLOBAL_ROOT_UID; | |
203 | *gid = gid_valid(ns_root_gid) ? ns_root_gid : GLOBAL_ROOT_GID; | |
204 | } | |
205 | ||
795f90c6 | 206 | static int ipc_permissions(struct ctl_table_header *head, const struct ctl_table *table) |
0889f44e AG |
207 | { |
208 | int mode = table->mode; | |
209 | ||
210 | #ifdef CONFIG_CHECKPOINT_RESTORE | |
50ec499b AG |
211 | struct ipc_namespace *ns = |
212 | container_of(head->set, struct ipc_namespace, ipc_set); | |
0889f44e AG |
213 | |
214 | if (((table->data == &ns->ids[IPC_SEM_IDS].next_id) || | |
215 | (table->data == &ns->ids[IPC_MSG_IDS].next_id) || | |
216 | (table->data == &ns->ids[IPC_SHM_IDS].next_id)) && | |
217 | checkpoint_restore_ns_capable(ns->user_ns)) | |
218 | mode = 0666; | |
50ec499b | 219 | else |
0889f44e | 220 | #endif |
50ec499b AG |
221 | { |
222 | kuid_t ns_root_uid; | |
223 | kgid_t ns_root_gid; | |
224 | ||
520713a9 | 225 | ipc_set_ownership(head, &ns_root_uid, &ns_root_gid); |
50ec499b AG |
226 | |
227 | if (uid_eq(current_euid(), ns_root_uid)) | |
228 | mode >>= 6; | |
229 | ||
230 | else if (in_egroup_p(ns_root_gid)) | |
231 | mode >>= 3; | |
232 | } | |
233 | ||
234 | mode &= 7; | |
235 | ||
236 | return (mode << 6) | (mode << 3) | mode; | |
0889f44e AG |
237 | } |
238 | ||
1f5c135e AG |
239 | static struct ctl_table_root set_root = { |
240 | .lookup = set_lookup, | |
0889f44e | 241 | .permissions = ipc_permissions, |
50ec499b | 242 | .set_ownership = ipc_set_ownership, |
a5494dcd EB |
243 | }; |
244 | ||
1f5c135e AG |
245 | bool setup_ipc_sysctls(struct ipc_namespace *ns) |
246 | { | |
247 | struct ctl_table *tbl; | |
248 | ||
249 | setup_sysctl_set(&ns->ipc_set, &set_root, set_is_seen); | |
250 | ||
251 | tbl = kmemdup(ipc_sysctls, sizeof(ipc_sysctls), GFP_KERNEL); | |
252 | if (tbl) { | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < ARRAY_SIZE(ipc_sysctls); i++) { | |
38cd5b12 | 256 | if (tbl[i].data == &init_ipc_ns.shm_ctlmax) |
1f5c135e AG |
257 | tbl[i].data = &ns->shm_ctlmax; |
258 | ||
38cd5b12 | 259 | else if (tbl[i].data == &init_ipc_ns.shm_ctlall) |
1f5c135e AG |
260 | tbl[i].data = &ns->shm_ctlall; |
261 | ||
38cd5b12 | 262 | else if (tbl[i].data == &init_ipc_ns.shm_ctlmni) |
1f5c135e AG |
263 | tbl[i].data = &ns->shm_ctlmni; |
264 | ||
38cd5b12 | 265 | else if (tbl[i].data == &init_ipc_ns.shm_rmid_forced) |
1f5c135e | 266 | tbl[i].data = &ns->shm_rmid_forced; |
1f5c135e | 267 | |
38cd5b12 | 268 | else if (tbl[i].data == &init_ipc_ns.msg_ctlmax) |
1f5c135e AG |
269 | tbl[i].data = &ns->msg_ctlmax; |
270 | ||
38cd5b12 | 271 | else if (tbl[i].data == &init_ipc_ns.msg_ctlmni) |
1f5c135e AG |
272 | tbl[i].data = &ns->msg_ctlmni; |
273 | ||
38cd5b12 | 274 | else if (tbl[i].data == &init_ipc_ns.msg_ctlmnb) |
1f5c135e AG |
275 | tbl[i].data = &ns->msg_ctlmnb; |
276 | ||
38cd5b12 | 277 | else if (tbl[i].data == &init_ipc_ns.sem_ctls) |
1f5c135e | 278 | tbl[i].data = &ns->sem_ctls; |
1f5c135e | 279 | #ifdef CONFIG_CHECKPOINT_RESTORE |
38cd5b12 | 280 | else if (tbl[i].data == &init_ipc_ns.ids[IPC_SEM_IDS].next_id) |
1f5c135e | 281 | tbl[i].data = &ns->ids[IPC_SEM_IDS].next_id; |
1f5c135e | 282 | |
38cd5b12 | 283 | else if (tbl[i].data == &init_ipc_ns.ids[IPC_MSG_IDS].next_id) |
1f5c135e | 284 | tbl[i].data = &ns->ids[IPC_MSG_IDS].next_id; |
1f5c135e | 285 | |
38cd5b12 | 286 | else if (tbl[i].data == &init_ipc_ns.ids[IPC_SHM_IDS].next_id) |
1f5c135e | 287 | tbl[i].data = &ns->ids[IPC_SHM_IDS].next_id; |
1f5c135e | 288 | #endif |
38cd5b12 | 289 | else |
1f5c135e | 290 | tbl[i].data = NULL; |
1f5c135e AG |
291 | } |
292 | ||
8e882910 | 293 | ns->ipc_sysctls = __register_sysctl_table(&ns->ipc_set, "kernel", tbl, |
bff97cf1 | 294 | ARRAY_SIZE(ipc_sysctls)); |
1f5c135e AG |
295 | } |
296 | if (!ns->ipc_sysctls) { | |
297 | kfree(tbl); | |
298 | retire_sysctl_set(&ns->ipc_set); | |
299 | return false; | |
300 | } | |
301 | ||
302 | return true; | |
303 | } | |
304 | ||
305 | void retire_ipc_sysctls(struct ipc_namespace *ns) | |
306 | { | |
bfa858f2 | 307 | const struct ctl_table *tbl; |
1f5c135e AG |
308 | |
309 | tbl = ns->ipc_sysctls->ctl_table_arg; | |
310 | unregister_sysctl_table(ns->ipc_sysctls); | |
311 | retire_sysctl_set(&ns->ipc_set); | |
312 | kfree(tbl); | |
313 | } | |
314 | ||
a5494dcd EB |
315 | static int __init ipc_sysctl_init(void) |
316 | { | |
1f5c135e AG |
317 | if (!setup_ipc_sysctls(&init_ipc_ns)) { |
318 | pr_warn("ipc sysctl registration failed\n"); | |
319 | return -ENOMEM; | |
320 | } | |
a5494dcd EB |
321 | return 0; |
322 | } | |
323 | ||
6d08a256 | 324 | device_initcall(ipc_sysctl_init); |
5ac893b8 WL |
325 | |
326 | static int __init ipc_mni_extend(char *str) | |
327 | { | |
328 | ipc_mni = IPCMNI_EXTEND; | |
329 | ipc_mni_shift = IPCMNI_EXTEND_SHIFT; | |
99db46ea | 330 | ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE; |
5ac893b8 WL |
331 | pr_info("IPCMNI extended to %d.\n", ipc_mni); |
332 | return 0; | |
333 | } | |
334 | early_param("ipcmni_extend", ipc_mni_extend); |