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Commit | Line | Data |
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b5e95b48 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor LSM hooks. | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
3c4ed7bd | 15 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
16 | #include <linux/moduleparam.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/namei.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/audit.h> | |
3486740a | 25 | #include <linux/user_namespace.h> |
e025be0f | 26 | #include <linux/kmemleak.h> |
b5e95b48 JJ |
27 | #include <net/sock.h> |
28 | ||
29 | #include "include/apparmor.h" | |
30 | #include "include/apparmorfs.h" | |
31 | #include "include/audit.h" | |
32 | #include "include/capability.h" | |
33 | #include "include/context.h" | |
34 | #include "include/file.h" | |
35 | #include "include/ipc.h" | |
36 | #include "include/path.h" | |
637f688d | 37 | #include "include/label.h" |
b5e95b48 | 38 | #include "include/policy.h" |
cff281f6 | 39 | #include "include/policy_ns.h" |
b5e95b48 JJ |
40 | #include "include/procattr.h" |
41 | ||
42 | /* Flag indicating whether initialization completed */ | |
545de8fe | 43 | int apparmor_initialized; |
b5e95b48 | 44 | |
d4669f0b JJ |
45 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
46 | ||
47 | ||
b5e95b48 JJ |
48 | /* |
49 | * LSM hook functions | |
50 | */ | |
51 | ||
52 | /* | |
637f688d | 53 | * free the associated aa_task_ctx and put its labels |
b5e95b48 JJ |
54 | */ |
55 | static void apparmor_cred_free(struct cred *cred) | |
56 | { | |
55a26ebf JJ |
57 | aa_free_task_context(cred_ctx(cred)); |
58 | cred_ctx(cred) = NULL; | |
b5e95b48 JJ |
59 | } |
60 | ||
61 | /* | |
62 | * allocate the apparmor part of blank credentials | |
63 | */ | |
64 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
65 | { | |
66 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
67 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
68 | ||
69 | if (!ctx) | |
b5e95b48 JJ |
70 | return -ENOMEM; |
71 | ||
55a26ebf | 72 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
73 | return 0; |
74 | } | |
75 | ||
76 | /* | |
55a26ebf | 77 | * prepare new aa_task_ctx for modification by prepare_cred block |
b5e95b48 JJ |
78 | */ |
79 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
80 | gfp_t gfp) | |
81 | { | |
82 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
83 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
84 | ||
85 | if (!ctx) | |
b5e95b48 JJ |
86 | return -ENOMEM; |
87 | ||
55a26ebf JJ |
88 | aa_dup_task_context(ctx, cred_ctx(old)); |
89 | cred_ctx(new) = ctx; | |
b5e95b48 JJ |
90 | return 0; |
91 | } | |
92 | ||
93 | /* | |
94 | * transfer the apparmor data to a blank set of creds | |
95 | */ | |
96 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
97 | { | |
55a26ebf JJ |
98 | const struct aa_task_ctx *old_ctx = cred_ctx(old); |
99 | struct aa_task_ctx *new_ctx = cred_ctx(new); | |
b5e95b48 | 100 | |
55a26ebf | 101 | aa_dup_task_context(new_ctx, old_ctx); |
b5e95b48 JJ |
102 | } |
103 | ||
104 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
105 | unsigned int mode) | |
106 | { | |
b5e95b48 JJ |
107 | return aa_ptrace(current, child, mode); |
108 | } | |
109 | ||
110 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
111 | { | |
b5e95b48 JJ |
112 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); |
113 | } | |
114 | ||
115 | /* Derived from security/commoncap.c:cap_capget */ | |
116 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
117 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
118 | { | |
637f688d | 119 | struct aa_label *label; |
b5e95b48 JJ |
120 | const struct cred *cred; |
121 | ||
122 | rcu_read_lock(); | |
123 | cred = __task_cred(target); | |
637f688d | 124 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 125 | |
b1d9e6b0 CS |
126 | /* |
127 | * cap_capget is stacked ahead of this and will | |
128 | * initialize effective and permitted. | |
129 | */ | |
c70c86c4 JJ |
130 | if (!unconfined(label)) { |
131 | struct aa_profile *profile; | |
132 | struct label_it i; | |
133 | ||
134 | label_for_each_confined(i, label, profile) { | |
135 | if (COMPLAIN_MODE(profile)) | |
136 | continue; | |
137 | *effective = cap_intersect(*effective, | |
138 | profile->caps.allow); | |
139 | *permitted = cap_intersect(*permitted, | |
140 | profile->caps.allow); | |
141 | } | |
b5e95b48 JJ |
142 | } |
143 | rcu_read_unlock(); | |
637f688d | 144 | aa_put_label(label); |
b5e95b48 JJ |
145 | |
146 | return 0; | |
147 | } | |
148 | ||
6a9de491 EP |
149 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
150 | int cap, int audit) | |
b5e95b48 | 151 | { |
637f688d | 152 | struct aa_label *label; |
b1d9e6b0 CS |
153 | int error = 0; |
154 | ||
637f688d JJ |
155 | label = aa_get_newest_cred_label(cred); |
156 | if (!unconfined(label)) | |
c70c86c4 | 157 | error = aa_capable(label, cap, audit); |
637f688d | 158 | aa_put_label(label); |
cf797c0e | 159 | |
b5e95b48 JJ |
160 | return error; |
161 | } | |
162 | ||
163 | /** | |
164 | * common_perm - basic common permission check wrapper fn for paths | |
165 | * @op: operation being checked | |
166 | * @path: path to check permission of (NOT NULL) | |
167 | * @mask: requested permissions mask | |
168 | * @cond: conditional info for the permission request (NOT NULL) | |
169 | * | |
170 | * Returns: %0 else error code if error or permission denied | |
171 | */ | |
47f6e5cc | 172 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
173 | struct path_cond *cond) |
174 | { | |
637f688d | 175 | struct aa_label *label; |
b5e95b48 JJ |
176 | int error = 0; |
177 | ||
637f688d JJ |
178 | label = __begin_current_label_crit_section(); |
179 | if (!unconfined(label)) | |
180 | error = aa_path_perm(op, labels_profile(label), path, 0, mask, | |
181 | cond); | |
182 | __end_current_label_crit_section(label); | |
b5e95b48 JJ |
183 | |
184 | return error; | |
185 | } | |
186 | ||
187 | /** | |
31f75bfe | 188 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 189 | * @op: operation being checked |
31f75bfe | 190 | * @path: location to check (NOT NULL) |
b5e95b48 | 191 | * @mask: requested permissions mask |
b5e95b48 JJ |
192 | * |
193 | * Returns: %0 else error code if error or permission denied | |
194 | */ | |
31f75bfe | 195 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 196 | { |
31f75bfe JJ |
197 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
198 | d_backing_inode(path->dentry)->i_mode | |
199 | }; | |
b5e95b48 | 200 | |
31f75bfe JJ |
201 | if (!path_mediated_fs(path->dentry)) |
202 | return 0; | |
203 | ||
204 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
205 | } |
206 | ||
207 | /** | |
31f75bfe | 208 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 209 | * @op: operation being checked |
31f75bfe JJ |
210 | * @dir: directory of the dentry (NOT NULL) |
211 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 212 | * @mask: requested permissions mask |
31f75bfe | 213 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
214 | * |
215 | * Returns: %0 else error code if error or permission denied | |
216 | */ | |
31f75bfe JJ |
217 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
218 | struct dentry *dentry, u32 mask, | |
219 | struct path_cond *cond) | |
b5e95b48 | 220 | { |
31f75bfe | 221 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 222 | |
31f75bfe | 223 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
224 | } |
225 | ||
226 | /** | |
227 | * common_perm_rm - common permission wrapper for operations doing rm | |
228 | * @op: operation being checked | |
229 | * @dir: directory that the dentry is in (NOT NULL) | |
230 | * @dentry: dentry being rm'd (NOT NULL) | |
231 | * @mask: requested permission mask | |
232 | * | |
233 | * Returns: %0 else error code if error or permission denied | |
234 | */ | |
47f6e5cc | 235 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
236 | struct dentry *dentry, u32 mask) |
237 | { | |
c6f493d6 | 238 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
239 | struct path_cond cond = { }; |
240 | ||
efeee83a | 241 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
242 | return 0; |
243 | ||
244 | cond.uid = inode->i_uid; | |
245 | cond.mode = inode->i_mode; | |
246 | ||
247 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
248 | } | |
249 | ||
250 | /** | |
251 | * common_perm_create - common permission wrapper for operations doing create | |
252 | * @op: operation being checked | |
253 | * @dir: directory that dentry will be created in (NOT NULL) | |
254 | * @dentry: dentry to create (NOT NULL) | |
255 | * @mask: request permission mask | |
256 | * @mode: created file mode | |
257 | * | |
258 | * Returns: %0 else error code if error or permission denied | |
259 | */ | |
47f6e5cc | 260 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 261 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
262 | { |
263 | struct path_cond cond = { current_fsuid(), mode }; | |
264 | ||
efeee83a | 265 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
266 | return 0; |
267 | ||
268 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
269 | } | |
270 | ||
989f74e0 | 271 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
272 | { |
273 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
274 | } | |
275 | ||
d3607752 | 276 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 277 | umode_t mode) |
b5e95b48 JJ |
278 | { |
279 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
280 | S_IFDIR); | |
281 | } | |
282 | ||
989f74e0 | 283 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
284 | { |
285 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
286 | } | |
287 | ||
d3607752 | 288 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 289 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
290 | { |
291 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
292 | } | |
293 | ||
81f4c506 | 294 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 295 | { |
e53cfe6c | 296 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
297 | } |
298 | ||
d3607752 | 299 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
300 | const char *old_name) |
301 | { | |
302 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
303 | S_IFLNK); | |
304 | } | |
305 | ||
3ccee46a | 306 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
307 | struct dentry *new_dentry) |
308 | { | |
637f688d | 309 | struct aa_label *label; |
b5e95b48 JJ |
310 | int error = 0; |
311 | ||
efeee83a | 312 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
313 | return 0; |
314 | ||
637f688d JJ |
315 | label = begin_current_label_crit_section(); |
316 | if (!unconfined(label)) | |
317 | error = aa_path_link(labels_profile(label), old_dentry, new_dir, | |
318 | new_dentry); | |
319 | end_current_label_crit_section(label); | |
cf797c0e | 320 | |
b5e95b48 JJ |
321 | return error; |
322 | } | |
323 | ||
3ccee46a AV |
324 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
325 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 326 | { |
637f688d | 327 | struct aa_label *label; |
b5e95b48 JJ |
328 | int error = 0; |
329 | ||
efeee83a | 330 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
331 | return 0; |
332 | ||
637f688d JJ |
333 | label = begin_current_label_crit_section(); |
334 | if (!unconfined(label)) { | |
8486adf0 KC |
335 | struct path old_path = { .mnt = old_dir->mnt, |
336 | .dentry = old_dentry }; | |
337 | struct path new_path = { .mnt = new_dir->mnt, | |
338 | .dentry = new_dentry }; | |
c6f493d6 DH |
339 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
340 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
341 | }; |
342 | ||
637f688d JJ |
343 | error = aa_path_perm(OP_RENAME_SRC, labels_profile(label), |
344 | &old_path, 0, | |
e53cfe6c JJ |
345 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
346 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
347 | &cond); |
348 | if (!error) | |
637f688d JJ |
349 | error = aa_path_perm(OP_RENAME_DEST, |
350 | labels_profile(label), | |
351 | &new_path, | |
e53cfe6c | 352 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
353 | AA_MAY_CREATE, &cond); |
354 | ||
355 | } | |
637f688d | 356 | end_current_label_crit_section(label); |
cf797c0e | 357 | |
b5e95b48 JJ |
358 | return error; |
359 | } | |
360 | ||
be01f9f2 | 361 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 362 | { |
31f75bfe | 363 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
364 | } |
365 | ||
7fd25dac | 366 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 367 | { |
31f75bfe | 368 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
369 | } |
370 | ||
3f7036a0 | 371 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 372 | { |
e53cfe6c | 373 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
374 | } |
375 | ||
83d49856 | 376 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 377 | { |
637f688d JJ |
378 | struct aa_file_ctx *fctx = file_ctx(file); |
379 | struct aa_label *label; | |
b5e95b48 JJ |
380 | int error = 0; |
381 | ||
efeee83a | 382 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
383 | return 0; |
384 | ||
385 | /* If in exec, permission is handled by bprm hooks. | |
386 | * Cache permissions granted by the previous exec check, with | |
387 | * implicit read and executable mmap which are required to | |
388 | * actually execute the image. | |
389 | */ | |
390 | if (current->in_execve) { | |
55a26ebf | 391 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
392 | return 0; |
393 | } | |
394 | ||
637f688d JJ |
395 | label = aa_get_newest_cred_label(cred); |
396 | if (!unconfined(label)) { | |
496ad9aa | 397 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
398 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
399 | ||
637f688d JJ |
400 | error = aa_path_perm(OP_OPEN, labels_profile(label), |
401 | &file->f_path, 0, | |
b5e95b48 JJ |
402 | aa_map_file_to_perms(file), &cond); |
403 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 404 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 405 | } |
637f688d | 406 | aa_put_label(label); |
b5e95b48 JJ |
407 | |
408 | return error; | |
409 | } | |
410 | ||
411 | static int apparmor_file_alloc_security(struct file *file) | |
412 | { | |
cf797c0e JJ |
413 | int error = 0; |
414 | ||
b5e95b48 | 415 | /* freed by apparmor_file_free_security */ |
637f688d | 416 | struct aa_label *label = begin_current_label_crit_section(); |
2835a13b JJ |
417 | file->f_security = aa_alloc_file_ctx(GFP_KERNEL); |
418 | if (!file_ctx(file)) | |
419 | error = -ENOMEM; | |
637f688d | 420 | end_current_label_crit_section(label); |
b5e95b48 | 421 | |
cf797c0e | 422 | return error; |
b5e95b48 JJ |
423 | } |
424 | ||
425 | static void apparmor_file_free_security(struct file *file) | |
426 | { | |
2835a13b | 427 | aa_free_file_ctx(file_ctx(file)); |
b5e95b48 JJ |
428 | } |
429 | ||
47f6e5cc | 430 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 431 | { |
55a26ebf | 432 | struct aa_file_ctx *fctx = file->f_security; |
637f688d | 433 | struct aa_label *label, *flabel; |
b5e95b48 JJ |
434 | int error = 0; |
435 | ||
192ca6b5 JJ |
436 | /* don't reaudit files closed during inheritance */ |
437 | if (file->f_path.dentry == aa_null.dentry) | |
438 | return -EACCES; | |
439 | ||
637f688d JJ |
440 | flabel = aa_cred_raw_label(file->f_cred); |
441 | AA_BUG(!flabel); | |
b5e95b48 JJ |
442 | |
443 | if (!file->f_path.mnt || | |
efeee83a | 444 | !path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
445 | return 0; |
446 | ||
637f688d | 447 | label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
448 | |
449 | /* revalidate access, if task is unconfined, or the cached cred | |
450 | * doesn't match or if the request is for more permissions than | |
451 | * was granted. | |
452 | * | |
453 | * Note: the test for !unconfined(fprofile) is to handle file | |
454 | * delegation from unconfined tasks | |
455 | */ | |
637f688d JJ |
456 | if (!unconfined(label) && !unconfined(flabel) && |
457 | ((flabel != label) || (mask & ~fctx->allow))) | |
458 | error = aa_file_perm(op, labels_profile(label), file, mask); | |
459 | __end_current_label_crit_section(label); | |
b5e95b48 JJ |
460 | |
461 | return error; | |
462 | } | |
463 | ||
464 | static int apparmor_file_permission(struct file *file, int mask) | |
465 | { | |
466 | return common_file_perm(OP_FPERM, file, mask); | |
467 | } | |
468 | ||
469 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
470 | { | |
471 | u32 mask = AA_MAY_LOCK; | |
472 | ||
473 | if (cmd == F_WRLCK) | |
474 | mask |= MAY_WRITE; | |
475 | ||
476 | return common_file_perm(OP_FLOCK, file, mask); | |
477 | } | |
478 | ||
47f6e5cc | 479 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
480 | unsigned long flags) |
481 | { | |
b5e95b48 JJ |
482 | int mask = 0; |
483 | ||
637f688d | 484 | if (!file || !file_ctx(file)) |
b5e95b48 JJ |
485 | return 0; |
486 | ||
487 | if (prot & PROT_READ) | |
488 | mask |= MAY_READ; | |
489 | /* | |
490 | * Private mappings don't require write perms since they don't | |
491 | * write back to the files | |
492 | */ | |
493 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
494 | mask |= MAY_WRITE; | |
495 | if (prot & PROT_EXEC) | |
496 | mask |= AA_EXEC_MMAP; | |
497 | ||
b5e95b48 JJ |
498 | return common_file_perm(op, file, mask); |
499 | } | |
500 | ||
e5467859 AV |
501 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
502 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 503 | { |
b5e95b48 JJ |
504 | return common_mmap(OP_FMMAP, file, prot, flags); |
505 | } | |
506 | ||
507 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
508 | unsigned long reqprot, unsigned long prot) | |
509 | { | |
510 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
511 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
512 | } | |
513 | ||
514 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
515 | char **value) | |
516 | { | |
517 | int error = -ENOENT; | |
b5e95b48 JJ |
518 | /* released below */ |
519 | const struct cred *cred = get_task_cred(task); | |
55a26ebf | 520 | struct aa_task_ctx *ctx = cred_ctx(cred); |
637f688d | 521 | struct aa_label *label = NULL; |
b5e95b48 JJ |
522 | |
523 | if (strcmp(name, "current") == 0) | |
637f688d | 524 | label = aa_get_newest_label(ctx->label); |
55a26ebf | 525 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
637f688d | 526 | label = aa_get_newest_label(ctx->previous); |
55a26ebf | 527 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
637f688d | 528 | label = aa_get_newest_label(ctx->onexec); |
b5e95b48 JJ |
529 | else |
530 | error = -EINVAL; | |
531 | ||
637f688d | 532 | if (label) |
76a1d263 | 533 | error = aa_getprocattr(label, value); |
77b071b3 | 534 | |
637f688d | 535 | aa_put_label(label); |
b5e95b48 JJ |
536 | put_cred(cred); |
537 | ||
538 | return error; | |
539 | } | |
540 | ||
b21507e2 SS |
541 | static int apparmor_setprocattr(const char *name, void *value, |
542 | size_t size) | |
b5e95b48 | 543 | { |
e89b8081 | 544 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
545 | size_t arg_size; |
546 | int error; | |
ef88a7ac | 547 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
548 | |
549 | if (size == 0) | |
550 | return -EINVAL; | |
b5e95b48 | 551 | |
e89b8081 VN |
552 | /* AppArmor requires that the buffer must be null terminated atm */ |
553 | if (args[size - 1] != '\0') { | |
554 | /* null terminate */ | |
555 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
556 | if (!args) | |
557 | return -ENOMEM; | |
558 | memcpy(args, value, size); | |
559 | args[size] = '\0'; | |
560 | } | |
561 | ||
562 | error = -EINVAL; | |
b5e95b48 JJ |
563 | args = strim(args); |
564 | command = strsep(&args, " "); | |
565 | if (!args) | |
e89b8081 | 566 | goto out; |
b5e95b48 JJ |
567 | args = skip_spaces(args); |
568 | if (!*args) | |
e89b8081 | 569 | goto out; |
b5e95b48 | 570 | |
d4d03f74 | 571 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
572 | if (strcmp(name, "current") == 0) { |
573 | if (strcmp(command, "changehat") == 0) { | |
574 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 575 | AA_CHANGE_NOFLAGS); |
b5e95b48 JJ |
576 | } else if (strcmp(command, "permhat") == 0) { |
577 | error = aa_setprocattr_changehat(args, arg_size, | |
df8073c6 | 578 | AA_CHANGE_TEST); |
b5e95b48 | 579 | } else if (strcmp(command, "changeprofile") == 0) { |
df8073c6 | 580 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
b5e95b48 | 581 | } else if (strcmp(command, "permprofile") == 0) { |
df8073c6 | 582 | error = aa_change_profile(args, AA_CHANGE_TEST); |
3eea57c2 JJ |
583 | } else |
584 | goto fail; | |
b5e95b48 | 585 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 586 | if (strcmp(command, "exec") == 0) |
df8073c6 | 587 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
3eea57c2 JJ |
588 | else |
589 | goto fail; | |
590 | } else | |
b5e95b48 | 591 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 592 | goto fail; |
3eea57c2 | 593 | |
b5e95b48 JJ |
594 | if (!error) |
595 | error = size; | |
e89b8081 VN |
596 | out: |
597 | kfree(largs); | |
b5e95b48 | 598 | return error; |
3eea57c2 JJ |
599 | |
600 | fail: | |
637f688d | 601 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
602 | aad(&sa)->info = name; |
603 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 604 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 605 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 606 | goto out; |
b5e95b48 JJ |
607 | } |
608 | ||
fe864821 JJ |
609 | /** |
610 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
611 | * @bprm: binprm for the exec (NOT NULL) | |
612 | */ | |
613 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
614 | { | |
637f688d | 615 | struct aa_label *label = aa_current_raw_label(); |
fe864821 JJ |
616 | struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); |
617 | ||
618 | /* bail out if unconfined or not changing profile */ | |
637f688d JJ |
619 | if ((new_ctx->label->proxy == label->proxy) || |
620 | (unconfined(new_ctx->label))) | |
fe864821 JJ |
621 | return; |
622 | ||
192ca6b5 JJ |
623 | aa_inherit_files(bprm->cred, current->files); |
624 | ||
fe864821 JJ |
625 | current->pdeath_signal = 0; |
626 | ||
637f688d | 627 | /* reset soft limits and set hard limits for the new label */ |
86b92cb7 | 628 | __aa_transition_rlimits(label, new_ctx->label); |
fe864821 JJ |
629 | } |
630 | ||
631 | /** | |
632 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
633 | * @bprm: binprm for the exec (NOT NULL) | |
634 | */ | |
635 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
636 | { | |
637 | /* TODO: cleanup signals - ipc mediation */ | |
638 | return; | |
639 | } | |
640 | ||
7cb4dc9f JS |
641 | static int apparmor_task_setrlimit(struct task_struct *task, |
642 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 643 | { |
637f688d | 644 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
645 | int error = 0; |
646 | ||
637f688d | 647 | if (!unconfined(label)) |
86b92cb7 | 648 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 649 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
650 | |
651 | return error; | |
652 | } | |
653 | ||
ca97d939 | 654 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
655 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
656 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
657 | LSM_HOOK_INIT(capget, apparmor_capget), | |
658 | LSM_HOOK_INIT(capable, apparmor_capable), | |
659 | ||
660 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
661 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
662 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
663 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
664 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
665 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
666 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
667 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
668 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
669 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
670 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
671 | ||
672 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
673 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), | |
674 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
675 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
676 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
677 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
678 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
679 | ||
680 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
681 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
682 | ||
683 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
684 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
685 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
686 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
687 | ||
688 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
689 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
690 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
691 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
692 | ||
693 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
694 | }; |
695 | ||
696 | /* | |
697 | * AppArmor sysfs module parameters | |
698 | */ | |
699 | ||
101d6c82 SR |
700 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
701 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 702 | #define param_check_aabool param_check_bool |
9c27847d | 703 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 704 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
705 | .set = param_set_aabool, |
706 | .get = param_get_aabool | |
707 | }; | |
b5e95b48 | 708 | |
101d6c82 SR |
709 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
710 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 711 | #define param_check_aauint param_check_uint |
9c27847d | 712 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
713 | .set = param_set_aauint, |
714 | .get = param_get_aauint | |
715 | }; | |
b5e95b48 | 716 | |
101d6c82 SR |
717 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
718 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 719 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 720 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 721 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
722 | .set = param_set_aalockpolicy, |
723 | .get = param_get_aalockpolicy | |
724 | }; | |
b5e95b48 JJ |
725 | |
726 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
727 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
728 | |
729 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
730 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
731 | |
732 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
733 | * We define special types as we want to do additional mediation. | |
734 | */ | |
735 | ||
736 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
737 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
738 | module_param_call(mode, param_set_mode, param_get_mode, | |
739 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
740 | ||
6059f71f | 741 | /* whether policy verification hashing is enabled */ |
7616ac70 | 742 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 743 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 744 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 745 | #endif |
6059f71f | 746 | |
b5e95b48 | 747 | /* Debug mode */ |
eea7a05f | 748 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
749 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
750 | ||
751 | /* Audit mode */ | |
752 | enum audit_mode aa_g_audit; | |
753 | module_param_call(audit, param_set_audit, param_get_audit, | |
754 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
755 | ||
756 | /* Determines if audit header is included in audited messages. This | |
757 | * provides more context if the audit daemon is not running | |
758 | */ | |
90ab5ee9 | 759 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
760 | module_param_named(audit_header, aa_g_audit_header, aabool, |
761 | S_IRUSR | S_IWUSR); | |
762 | ||
763 | /* lock out loading/removal of policy | |
764 | * TODO: add in at boot loading of policy, which is the only way to | |
765 | * load policy, if lock_policy is set | |
766 | */ | |
90ab5ee9 | 767 | bool aa_g_lock_policy; |
b5e95b48 JJ |
768 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
769 | S_IRUSR | S_IWUSR); | |
770 | ||
771 | /* Syscall logging mode */ | |
90ab5ee9 | 772 | bool aa_g_logsyscall; |
b5e95b48 JJ |
773 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
774 | ||
775 | /* Maximum pathname length before accesses will start getting rejected */ | |
776 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 777 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
778 | |
779 | /* Determines how paranoid loading of policy is and how much verification | |
780 | * on the loaded policy is done. | |
abbf8734 JJ |
781 | * DEPRECATED: read only as strict checking of load is always done now |
782 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 783 | */ |
90ab5ee9 | 784 | bool aa_g_paranoid_load = 1; |
abbf8734 | 785 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
786 | |
787 | /* Boot time disable flag */ | |
90ab5ee9 | 788 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 789 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
790 | |
791 | static int __init apparmor_enabled_setup(char *str) | |
792 | { | |
793 | unsigned long enabled; | |
29707b20 | 794 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
795 | if (!error) |
796 | apparmor_enabled = enabled ? 1 : 0; | |
797 | return 1; | |
798 | } | |
799 | ||
800 | __setup("apparmor=", apparmor_enabled_setup); | |
801 | ||
802 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 803 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 804 | { |
545de8fe JJ |
805 | if (!apparmor_enabled) |
806 | return -EINVAL; | |
807 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 808 | return -EPERM; |
b5e95b48 JJ |
809 | return param_set_bool(val, kp); |
810 | } | |
811 | ||
101d6c82 | 812 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 813 | { |
ca4bd5ae JJ |
814 | if (!apparmor_enabled) |
815 | return -EINVAL; | |
545de8fe JJ |
816 | if (apparmor_initialized && !policy_view_capable(NULL)) |
817 | return -EPERM; | |
b5e95b48 JJ |
818 | return param_get_bool(buffer, kp); |
819 | } | |
820 | ||
101d6c82 | 821 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 822 | { |
ca4bd5ae JJ |
823 | if (!apparmor_enabled) |
824 | return -EINVAL; | |
545de8fe JJ |
825 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
826 | return -EPERM; | |
b5e95b48 JJ |
827 | return param_set_bool(val, kp); |
828 | } | |
829 | ||
101d6c82 | 830 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 831 | { |
ca4bd5ae JJ |
832 | if (!apparmor_enabled) |
833 | return -EINVAL; | |
545de8fe JJ |
834 | if (apparmor_initialized && !policy_view_capable(NULL)) |
835 | return -EPERM; | |
b5e95b48 JJ |
836 | return param_get_bool(buffer, kp); |
837 | } | |
838 | ||
101d6c82 | 839 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 840 | { |
39d84824 JJ |
841 | int error; |
842 | ||
ca4bd5ae JJ |
843 | if (!apparmor_enabled) |
844 | return -EINVAL; | |
39d84824 JJ |
845 | /* file is ro but enforce 2nd line check */ |
846 | if (apparmor_initialized) | |
545de8fe | 847 | return -EPERM; |
39d84824 JJ |
848 | |
849 | error = param_set_uint(val, kp); | |
850 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
851 | ||
852 | return error; | |
b5e95b48 JJ |
853 | } |
854 | ||
101d6c82 | 855 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 856 | { |
ca4bd5ae JJ |
857 | if (!apparmor_enabled) |
858 | return -EINVAL; | |
545de8fe JJ |
859 | if (apparmor_initialized && !policy_view_capable(NULL)) |
860 | return -EPERM; | |
b5e95b48 JJ |
861 | return param_get_uint(buffer, kp); |
862 | } | |
863 | ||
864 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
865 | { | |
b5e95b48 JJ |
866 | if (!apparmor_enabled) |
867 | return -EINVAL; | |
545de8fe JJ |
868 | if (apparmor_initialized && !policy_view_capable(NULL)) |
869 | return -EPERM; | |
b5e95b48 JJ |
870 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
871 | } | |
872 | ||
873 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
874 | { | |
875 | int i; | |
b5e95b48 JJ |
876 | |
877 | if (!apparmor_enabled) | |
878 | return -EINVAL; | |
b5e95b48 JJ |
879 | if (!val) |
880 | return -EINVAL; | |
545de8fe JJ |
881 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
882 | return -EPERM; | |
b5e95b48 JJ |
883 | |
884 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
885 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
886 | aa_g_audit = i; | |
887 | return 0; | |
888 | } | |
889 | } | |
890 | ||
891 | return -EINVAL; | |
892 | } | |
893 | ||
894 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
895 | { | |
b5e95b48 JJ |
896 | if (!apparmor_enabled) |
897 | return -EINVAL; | |
545de8fe JJ |
898 | if (apparmor_initialized && !policy_view_capable(NULL)) |
899 | return -EPERM; | |
b5e95b48 | 900 | |
0d259f04 | 901 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
902 | } |
903 | ||
904 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
905 | { | |
906 | int i; | |
b5e95b48 JJ |
907 | |
908 | if (!apparmor_enabled) | |
909 | return -EINVAL; | |
b5e95b48 JJ |
910 | if (!val) |
911 | return -EINVAL; | |
545de8fe JJ |
912 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
913 | return -EPERM; | |
b5e95b48 | 914 | |
0d259f04 JJ |
915 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
916 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
917 | aa_g_profile_mode = i; |
918 | return 0; | |
919 | } | |
920 | } | |
921 | ||
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * AppArmor init functions | |
927 | */ | |
928 | ||
929 | /** | |
55a26ebf | 930 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
931 | * |
932 | * TODO: allow setting an alternate profile than unconfined | |
933 | */ | |
55a26ebf | 934 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
935 | { |
936 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 937 | struct aa_task_ctx *ctx; |
b5e95b48 | 938 | |
55a26ebf JJ |
939 | ctx = aa_alloc_task_context(GFP_KERNEL); |
940 | if (!ctx) | |
b5e95b48 JJ |
941 | return -ENOMEM; |
942 | ||
637f688d | 943 | ctx->label = aa_get_label(ns_unconfined(root_ns)); |
55a26ebf | 944 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
d4669f0b JJ |
949 | static void destroy_buffers(void) |
950 | { | |
951 | u32 i, j; | |
952 | ||
953 | for_each_possible_cpu(i) { | |
954 | for_each_cpu_buffer(j) { | |
955 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
956 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
957 | } | |
958 | } | |
959 | } | |
960 | ||
961 | static int __init alloc_buffers(void) | |
962 | { | |
963 | u32 i, j; | |
964 | ||
965 | for_each_possible_cpu(i) { | |
966 | for_each_cpu_buffer(j) { | |
967 | char *buffer; | |
968 | ||
969 | if (cpu_to_node(i) > num_online_nodes()) | |
970 | /* fallback to kmalloc for offline nodes */ | |
971 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
972 | else | |
973 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
974 | cpu_to_node(i)); | |
975 | if (!buffer) { | |
976 | destroy_buffers(); | |
977 | return -ENOMEM; | |
978 | } | |
979 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
980 | } | |
981 | } | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
e3ea1ca5 TH |
986 | #ifdef CONFIG_SYSCTL |
987 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
988 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
989 | { | |
990 | if (!policy_admin_capable(NULL)) | |
991 | return -EPERM; | |
992 | if (!apparmor_enabled) | |
993 | return -EINVAL; | |
994 | ||
995 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
996 | } | |
997 | ||
998 | static struct ctl_path apparmor_sysctl_path[] = { | |
999 | { .procname = "kernel", }, | |
1000 | { } | |
1001 | }; | |
1002 | ||
1003 | static struct ctl_table apparmor_sysctl_table[] = { | |
1004 | { | |
1005 | .procname = "unprivileged_userns_apparmor_policy", | |
1006 | .data = &unprivileged_userns_apparmor_policy, | |
1007 | .maxlen = sizeof(int), | |
1008 | .mode = 0600, | |
1009 | .proc_handler = apparmor_dointvec, | |
1010 | }, | |
1011 | { } | |
1012 | }; | |
1013 | ||
1014 | static int __init apparmor_init_sysctl(void) | |
1015 | { | |
1016 | return register_sysctl_paths(apparmor_sysctl_path, | |
1017 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1018 | } | |
1019 | #else | |
1020 | static inline int apparmor_init_sysctl(void) | |
1021 | { | |
1022 | return 0; | |
1023 | } | |
1024 | #endif /* CONFIG_SYSCTL */ | |
1025 | ||
b5e95b48 JJ |
1026 | static int __init apparmor_init(void) |
1027 | { | |
1028 | int error; | |
1029 | ||
b1d9e6b0 | 1030 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
1031 | aa_info_message("AppArmor disabled by boot time parameter"); |
1032 | apparmor_enabled = 0; | |
1033 | return 0; | |
1034 | } | |
1035 | ||
11c236b8 JJ |
1036 | error = aa_setup_dfa_engine(); |
1037 | if (error) { | |
1038 | AA_ERROR("Unable to setup dfa engine\n"); | |
1039 | goto alloc_out; | |
1040 | } | |
1041 | ||
b5e95b48 JJ |
1042 | error = aa_alloc_root_ns(); |
1043 | if (error) { | |
1044 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1045 | goto alloc_out; | |
1046 | } | |
1047 | ||
e3ea1ca5 TH |
1048 | error = apparmor_init_sysctl(); |
1049 | if (error) { | |
1050 | AA_ERROR("Unable to register sysctls\n"); | |
1051 | goto alloc_out; | |
1052 | ||
1053 | } | |
1054 | ||
d4669f0b JJ |
1055 | error = alloc_buffers(); |
1056 | if (error) { | |
1057 | AA_ERROR("Unable to allocate work buffers\n"); | |
1058 | goto buffers_out; | |
1059 | } | |
1060 | ||
55a26ebf | 1061 | error = set_init_ctx(); |
b5e95b48 JJ |
1062 | if (error) { |
1063 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1064 | aa_free_root_ns(); |
d4669f0b | 1065 | goto buffers_out; |
b5e95b48 | 1066 | } |
d69dece5 CS |
1067 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1068 | "apparmor"); | |
b5e95b48 JJ |
1069 | |
1070 | /* Report that AppArmor successfully initialized */ | |
1071 | apparmor_initialized = 1; | |
1072 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1073 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1074 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1075 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1076 | else | |
1077 | aa_info_message("AppArmor initialized"); | |
1078 | ||
1079 | return error; | |
1080 | ||
d4669f0b JJ |
1081 | buffers_out: |
1082 | destroy_buffers(); | |
1083 | ||
b5e95b48 JJ |
1084 | alloc_out: |
1085 | aa_destroy_aafs(); | |
11c236b8 | 1086 | aa_teardown_dfa_engine(); |
b5e95b48 JJ |
1087 | |
1088 | apparmor_enabled = 0; | |
1089 | return error; | |
b5e95b48 JJ |
1090 | } |
1091 | ||
1092 | security_initcall(apparmor_init); |