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 | { | |
b2d09ae4 JJ |
107 | struct aa_label *tracer, *tracee; |
108 | int error; | |
109 | ||
110 | tracer = begin_current_label_crit_section(); | |
111 | tracee = aa_get_task_label(child); | |
112 | error = aa_may_ptrace(tracer, tracee, | |
113 | mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE); | |
114 | aa_put_label(tracee); | |
115 | end_current_label_crit_section(tracer); | |
116 | ||
117 | return error; | |
b5e95b48 JJ |
118 | } |
119 | ||
120 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
121 | { | |
b2d09ae4 JJ |
122 | struct aa_label *tracer, *tracee; |
123 | int error; | |
124 | ||
125 | tracee = begin_current_label_crit_section(); | |
126 | tracer = aa_get_task_label(parent); | |
127 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); | |
128 | aa_put_label(tracer); | |
129 | end_current_label_crit_section(tracee); | |
130 | ||
131 | return error; | |
b5e95b48 JJ |
132 | } |
133 | ||
134 | /* Derived from security/commoncap.c:cap_capget */ | |
135 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
136 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
137 | { | |
637f688d | 138 | struct aa_label *label; |
b5e95b48 JJ |
139 | const struct cred *cred; |
140 | ||
141 | rcu_read_lock(); | |
142 | cred = __task_cred(target); | |
637f688d | 143 | label = aa_get_newest_cred_label(cred); |
c70c86c4 | 144 | |
b1d9e6b0 CS |
145 | /* |
146 | * cap_capget is stacked ahead of this and will | |
147 | * initialize effective and permitted. | |
148 | */ | |
c70c86c4 JJ |
149 | if (!unconfined(label)) { |
150 | struct aa_profile *profile; | |
151 | struct label_it i; | |
152 | ||
153 | label_for_each_confined(i, label, profile) { | |
154 | if (COMPLAIN_MODE(profile)) | |
155 | continue; | |
156 | *effective = cap_intersect(*effective, | |
157 | profile->caps.allow); | |
158 | *permitted = cap_intersect(*permitted, | |
159 | profile->caps.allow); | |
160 | } | |
b5e95b48 JJ |
161 | } |
162 | rcu_read_unlock(); | |
637f688d | 163 | aa_put_label(label); |
b5e95b48 JJ |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
6a9de491 EP |
168 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
169 | int cap, int audit) | |
b5e95b48 | 170 | { |
637f688d | 171 | struct aa_label *label; |
b1d9e6b0 CS |
172 | int error = 0; |
173 | ||
637f688d JJ |
174 | label = aa_get_newest_cred_label(cred); |
175 | if (!unconfined(label)) | |
c70c86c4 | 176 | error = aa_capable(label, cap, audit); |
637f688d | 177 | aa_put_label(label); |
cf797c0e | 178 | |
b5e95b48 JJ |
179 | return error; |
180 | } | |
181 | ||
182 | /** | |
183 | * common_perm - basic common permission check wrapper fn for paths | |
184 | * @op: operation being checked | |
185 | * @path: path to check permission of (NOT NULL) | |
186 | * @mask: requested permissions mask | |
187 | * @cond: conditional info for the permission request (NOT NULL) | |
188 | * | |
189 | * Returns: %0 else error code if error or permission denied | |
190 | */ | |
47f6e5cc | 191 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
192 | struct path_cond *cond) |
193 | { | |
637f688d | 194 | struct aa_label *label; |
b5e95b48 JJ |
195 | int error = 0; |
196 | ||
637f688d JJ |
197 | label = __begin_current_label_crit_section(); |
198 | if (!unconfined(label)) | |
aebd873e | 199 | error = aa_path_perm(op, label, path, 0, mask, cond); |
637f688d | 200 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
201 | |
202 | return error; | |
203 | } | |
204 | ||
205 | /** | |
31f75bfe | 206 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 207 | * @op: operation being checked |
31f75bfe | 208 | * @path: location to check (NOT NULL) |
b5e95b48 | 209 | * @mask: requested permissions mask |
b5e95b48 JJ |
210 | * |
211 | * Returns: %0 else error code if error or permission denied | |
212 | */ | |
31f75bfe | 213 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 214 | { |
31f75bfe JJ |
215 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
216 | d_backing_inode(path->dentry)->i_mode | |
217 | }; | |
b5e95b48 | 218 | |
31f75bfe JJ |
219 | if (!path_mediated_fs(path->dentry)) |
220 | return 0; | |
221 | ||
222 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
223 | } |
224 | ||
225 | /** | |
31f75bfe | 226 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 227 | * @op: operation being checked |
31f75bfe JJ |
228 | * @dir: directory of the dentry (NOT NULL) |
229 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 230 | * @mask: requested permissions mask |
31f75bfe | 231 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
232 | * |
233 | * Returns: %0 else error code if error or permission denied | |
234 | */ | |
31f75bfe JJ |
235 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
236 | struct dentry *dentry, u32 mask, | |
237 | struct path_cond *cond) | |
b5e95b48 | 238 | { |
31f75bfe | 239 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 240 | |
31f75bfe | 241 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
242 | } |
243 | ||
244 | /** | |
245 | * common_perm_rm - common permission wrapper for operations doing rm | |
246 | * @op: operation being checked | |
247 | * @dir: directory that the dentry is in (NOT NULL) | |
248 | * @dentry: dentry being rm'd (NOT NULL) | |
249 | * @mask: requested permission mask | |
250 | * | |
251 | * Returns: %0 else error code if error or permission denied | |
252 | */ | |
47f6e5cc | 253 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
254 | struct dentry *dentry, u32 mask) |
255 | { | |
c6f493d6 | 256 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
257 | struct path_cond cond = { }; |
258 | ||
efeee83a | 259 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
260 | return 0; |
261 | ||
262 | cond.uid = inode->i_uid; | |
263 | cond.mode = inode->i_mode; | |
264 | ||
265 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
266 | } | |
267 | ||
268 | /** | |
269 | * common_perm_create - common permission wrapper for operations doing create | |
270 | * @op: operation being checked | |
271 | * @dir: directory that dentry will be created in (NOT NULL) | |
272 | * @dentry: dentry to create (NOT NULL) | |
273 | * @mask: request permission mask | |
274 | * @mode: created file mode | |
275 | * | |
276 | * Returns: %0 else error code if error or permission denied | |
277 | */ | |
47f6e5cc | 278 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 279 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
280 | { |
281 | struct path_cond cond = { current_fsuid(), mode }; | |
282 | ||
efeee83a | 283 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
284 | return 0; |
285 | ||
286 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
287 | } | |
288 | ||
989f74e0 | 289 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
290 | { |
291 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
292 | } | |
293 | ||
d3607752 | 294 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 295 | umode_t mode) |
b5e95b48 JJ |
296 | { |
297 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
298 | S_IFDIR); | |
299 | } | |
300 | ||
989f74e0 | 301 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
302 | { |
303 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
304 | } | |
305 | ||
d3607752 | 306 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 307 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
308 | { |
309 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
310 | } | |
311 | ||
81f4c506 | 312 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 313 | { |
e53cfe6c | 314 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
315 | } |
316 | ||
d3607752 | 317 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
318 | const char *old_name) |
319 | { | |
320 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
321 | S_IFLNK); | |
322 | } | |
323 | ||
3ccee46a | 324 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
325 | struct dentry *new_dentry) |
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)) | |
8014370f | 335 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
637f688d | 336 | end_current_label_crit_section(label); |
cf797c0e | 337 | |
b5e95b48 JJ |
338 | return error; |
339 | } | |
340 | ||
3ccee46a AV |
341 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
342 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 | 343 | { |
637f688d | 344 | struct aa_label *label; |
b5e95b48 JJ |
345 | int error = 0; |
346 | ||
efeee83a | 347 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
348 | return 0; |
349 | ||
637f688d JJ |
350 | label = begin_current_label_crit_section(); |
351 | if (!unconfined(label)) { | |
8486adf0 KC |
352 | struct path old_path = { .mnt = old_dir->mnt, |
353 | .dentry = old_dentry }; | |
354 | struct path new_path = { .mnt = new_dir->mnt, | |
355 | .dentry = new_dentry }; | |
c6f493d6 DH |
356 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
357 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
358 | }; |
359 | ||
aebd873e | 360 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
e53cfe6c JJ |
361 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
362 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
363 | &cond); |
364 | if (!error) | |
aebd873e | 365 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
e53cfe6c | 366 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
367 | AA_MAY_CREATE, &cond); |
368 | ||
369 | } | |
637f688d | 370 | end_current_label_crit_section(label); |
cf797c0e | 371 | |
b5e95b48 JJ |
372 | return error; |
373 | } | |
374 | ||
be01f9f2 | 375 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 376 | { |
31f75bfe | 377 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
378 | } |
379 | ||
7fd25dac | 380 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 381 | { |
31f75bfe | 382 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
383 | } |
384 | ||
3f7036a0 | 385 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 386 | { |
e53cfe6c | 387 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
388 | } |
389 | ||
83d49856 | 390 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 391 | { |
637f688d JJ |
392 | struct aa_file_ctx *fctx = file_ctx(file); |
393 | struct aa_label *label; | |
b5e95b48 JJ |
394 | int error = 0; |
395 | ||
efeee83a | 396 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
397 | return 0; |
398 | ||
399 | /* If in exec, permission is handled by bprm hooks. | |
400 | * Cache permissions granted by the previous exec check, with | |
401 | * implicit read and executable mmap which are required to | |
402 | * actually execute the image. | |
403 | */ | |
404 | if (current->in_execve) { | |
55a26ebf | 405 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
406 | return 0; |
407 | } | |
408 | ||
637f688d JJ |
409 | label = aa_get_newest_cred_label(cred); |
410 | if (!unconfined(label)) { | |
496ad9aa | 411 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
412 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
413 | ||
aebd873e | 414 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
b5e95b48 JJ |
415 | aa_map_file_to_perms(file), &cond); |
416 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 417 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 418 | } |
637f688d | 419 | aa_put_label(label); |
b5e95b48 JJ |
420 | |
421 | return error; | |
422 | } | |
423 | ||
424 | static int apparmor_file_alloc_security(struct file *file) | |
425 | { | |
cf797c0e JJ |
426 | int error = 0; |
427 | ||
b5e95b48 | 428 | /* freed by apparmor_file_free_security */ |
637f688d | 429 | struct aa_label *label = begin_current_label_crit_section(); |
190a9518 | 430 | file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); |
2835a13b JJ |
431 | if (!file_ctx(file)) |
432 | error = -ENOMEM; | |
637f688d | 433 | end_current_label_crit_section(label); |
b5e95b48 | 434 | |
cf797c0e | 435 | return error; |
b5e95b48 JJ |
436 | } |
437 | ||
438 | static void apparmor_file_free_security(struct file *file) | |
439 | { | |
2835a13b | 440 | aa_free_file_ctx(file_ctx(file)); |
b5e95b48 JJ |
441 | } |
442 | ||
47f6e5cc | 443 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 444 | { |
190a9518 | 445 | struct aa_label *label; |
b5e95b48 JJ |
446 | int error = 0; |
447 | ||
192ca6b5 JJ |
448 | /* don't reaudit files closed during inheritance */ |
449 | if (file->f_path.dentry == aa_null.dentry) | |
450 | return -EACCES; | |
451 | ||
637f688d | 452 | label = __begin_current_label_crit_section(); |
190a9518 | 453 | error = aa_file_perm(op, label, file, mask); |
637f688d | 454 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
455 | |
456 | return error; | |
457 | } | |
458 | ||
064dc947 JJ |
459 | static int apparmor_file_receive(struct file *file) |
460 | { | |
461 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); | |
462 | } | |
463 | ||
b5e95b48 JJ |
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); |
6c5fc8f1 JJ |
583 | } else if (strcmp(command, "stack") == 0) { |
584 | error = aa_change_profile(args, AA_CHANGE_STACK); | |
3eea57c2 JJ |
585 | } else |
586 | goto fail; | |
b5e95b48 | 587 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 588 | if (strcmp(command, "exec") == 0) |
df8073c6 | 589 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
6c5fc8f1 JJ |
590 | else if (strcmp(command, "stack") == 0) |
591 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | | |
592 | AA_CHANGE_STACK)); | |
3eea57c2 JJ |
593 | else |
594 | goto fail; | |
595 | } else | |
b5e95b48 | 596 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 597 | goto fail; |
3eea57c2 | 598 | |
b5e95b48 JJ |
599 | if (!error) |
600 | error = size; | |
e89b8081 VN |
601 | out: |
602 | kfree(largs); | |
b5e95b48 | 603 | return error; |
3eea57c2 JJ |
604 | |
605 | fail: | |
637f688d | 606 | aad(&sa)->label = begin_current_label_crit_section(); |
ef88a7ac JJ |
607 | aad(&sa)->info = name; |
608 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 609 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
637f688d | 610 | end_current_label_crit_section(aad(&sa)->label); |
e89b8081 | 611 | goto out; |
b5e95b48 JJ |
612 | } |
613 | ||
fe864821 JJ |
614 | /** |
615 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
616 | * @bprm: binprm for the exec (NOT NULL) | |
617 | */ | |
618 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
619 | { | |
637f688d | 620 | struct aa_label *label = aa_current_raw_label(); |
fe864821 JJ |
621 | struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); |
622 | ||
623 | /* bail out if unconfined or not changing profile */ | |
637f688d JJ |
624 | if ((new_ctx->label->proxy == label->proxy) || |
625 | (unconfined(new_ctx->label))) | |
fe864821 JJ |
626 | return; |
627 | ||
192ca6b5 JJ |
628 | aa_inherit_files(bprm->cred, current->files); |
629 | ||
fe864821 JJ |
630 | current->pdeath_signal = 0; |
631 | ||
637f688d | 632 | /* reset soft limits and set hard limits for the new label */ |
86b92cb7 | 633 | __aa_transition_rlimits(label, new_ctx->label); |
fe864821 JJ |
634 | } |
635 | ||
636 | /** | |
637 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
638 | * @bprm: binprm for the exec (NOT NULL) | |
639 | */ | |
640 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
641 | { | |
642 | /* TODO: cleanup signals - ipc mediation */ | |
643 | return; | |
644 | } | |
645 | ||
7cb4dc9f JS |
646 | static int apparmor_task_setrlimit(struct task_struct *task, |
647 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 648 | { |
637f688d | 649 | struct aa_label *label = __begin_current_label_crit_section(); |
b5e95b48 JJ |
650 | int error = 0; |
651 | ||
637f688d | 652 | if (!unconfined(label)) |
86b92cb7 | 653 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
637f688d | 654 | __end_current_label_crit_section(label); |
b5e95b48 JJ |
655 | |
656 | return error; | |
657 | } | |
658 | ||
ca97d939 | 659 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
660 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
661 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
662 | LSM_HOOK_INIT(capget, apparmor_capget), | |
663 | LSM_HOOK_INIT(capable, apparmor_capable), | |
664 | ||
665 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
666 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
667 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
668 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
669 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
670 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
671 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
672 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
673 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
674 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
675 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
676 | ||
677 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
064dc947 | 678 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
e20b043a CS |
679 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
680 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
681 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
682 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
683 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
684 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
685 | ||
686 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
687 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
688 | ||
689 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
690 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
691 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
692 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
693 | ||
694 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
695 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
696 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
697 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
698 | ||
699 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
700 | }; |
701 | ||
702 | /* | |
703 | * AppArmor sysfs module parameters | |
704 | */ | |
705 | ||
101d6c82 SR |
706 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
707 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 708 | #define param_check_aabool param_check_bool |
9c27847d | 709 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 710 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
711 | .set = param_set_aabool, |
712 | .get = param_get_aabool | |
713 | }; | |
b5e95b48 | 714 | |
101d6c82 SR |
715 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
716 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 717 | #define param_check_aauint param_check_uint |
9c27847d | 718 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
719 | .set = param_set_aauint, |
720 | .get = param_get_aauint | |
721 | }; | |
b5e95b48 | 722 | |
101d6c82 SR |
723 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
724 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 725 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 726 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 727 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
728 | .set = param_set_aalockpolicy, |
729 | .get = param_get_aalockpolicy | |
730 | }; | |
b5e95b48 JJ |
731 | |
732 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
733 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
734 | |
735 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
736 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
737 | |
738 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
739 | * We define special types as we want to do additional mediation. | |
740 | */ | |
741 | ||
742 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
743 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
744 | module_param_call(mode, param_set_mode, param_get_mode, | |
745 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
746 | ||
6059f71f | 747 | /* whether policy verification hashing is enabled */ |
7616ac70 | 748 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 749 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 750 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 751 | #endif |
6059f71f | 752 | |
b5e95b48 | 753 | /* Debug mode */ |
eea7a05f | 754 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
755 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
756 | ||
757 | /* Audit mode */ | |
758 | enum audit_mode aa_g_audit; | |
759 | module_param_call(audit, param_set_audit, param_get_audit, | |
760 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
761 | ||
762 | /* Determines if audit header is included in audited messages. This | |
763 | * provides more context if the audit daemon is not running | |
764 | */ | |
90ab5ee9 | 765 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
766 | module_param_named(audit_header, aa_g_audit_header, aabool, |
767 | S_IRUSR | S_IWUSR); | |
768 | ||
769 | /* lock out loading/removal of policy | |
770 | * TODO: add in at boot loading of policy, which is the only way to | |
771 | * load policy, if lock_policy is set | |
772 | */ | |
90ab5ee9 | 773 | bool aa_g_lock_policy; |
b5e95b48 JJ |
774 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
775 | S_IRUSR | S_IWUSR); | |
776 | ||
777 | /* Syscall logging mode */ | |
90ab5ee9 | 778 | bool aa_g_logsyscall; |
b5e95b48 JJ |
779 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
780 | ||
781 | /* Maximum pathname length before accesses will start getting rejected */ | |
782 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 783 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
784 | |
785 | /* Determines how paranoid loading of policy is and how much verification | |
786 | * on the loaded policy is done. | |
abbf8734 JJ |
787 | * DEPRECATED: read only as strict checking of load is always done now |
788 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 789 | */ |
90ab5ee9 | 790 | bool aa_g_paranoid_load = 1; |
abbf8734 | 791 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
792 | |
793 | /* Boot time disable flag */ | |
90ab5ee9 | 794 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 795 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
796 | |
797 | static int __init apparmor_enabled_setup(char *str) | |
798 | { | |
799 | unsigned long enabled; | |
29707b20 | 800 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
801 | if (!error) |
802 | apparmor_enabled = enabled ? 1 : 0; | |
803 | return 1; | |
804 | } | |
805 | ||
806 | __setup("apparmor=", apparmor_enabled_setup); | |
807 | ||
808 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 809 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 810 | { |
545de8fe JJ |
811 | if (!apparmor_enabled) |
812 | return -EINVAL; | |
813 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 814 | return -EPERM; |
b5e95b48 JJ |
815 | return param_set_bool(val, kp); |
816 | } | |
817 | ||
101d6c82 | 818 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 819 | { |
ca4bd5ae JJ |
820 | if (!apparmor_enabled) |
821 | return -EINVAL; | |
545de8fe JJ |
822 | if (apparmor_initialized && !policy_view_capable(NULL)) |
823 | return -EPERM; | |
b5e95b48 JJ |
824 | return param_get_bool(buffer, kp); |
825 | } | |
826 | ||
101d6c82 | 827 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 828 | { |
ca4bd5ae JJ |
829 | if (!apparmor_enabled) |
830 | return -EINVAL; | |
545de8fe JJ |
831 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
832 | return -EPERM; | |
b5e95b48 JJ |
833 | return param_set_bool(val, kp); |
834 | } | |
835 | ||
101d6c82 | 836 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 837 | { |
ca4bd5ae JJ |
838 | if (!apparmor_enabled) |
839 | return -EINVAL; | |
545de8fe JJ |
840 | if (apparmor_initialized && !policy_view_capable(NULL)) |
841 | return -EPERM; | |
b5e95b48 JJ |
842 | return param_get_bool(buffer, kp); |
843 | } | |
844 | ||
101d6c82 | 845 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 846 | { |
39d84824 JJ |
847 | int error; |
848 | ||
ca4bd5ae JJ |
849 | if (!apparmor_enabled) |
850 | return -EINVAL; | |
39d84824 JJ |
851 | /* file is ro but enforce 2nd line check */ |
852 | if (apparmor_initialized) | |
545de8fe | 853 | return -EPERM; |
39d84824 JJ |
854 | |
855 | error = param_set_uint(val, kp); | |
856 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
857 | ||
858 | return error; | |
b5e95b48 JJ |
859 | } |
860 | ||
101d6c82 | 861 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 862 | { |
ca4bd5ae JJ |
863 | if (!apparmor_enabled) |
864 | return -EINVAL; | |
545de8fe JJ |
865 | if (apparmor_initialized && !policy_view_capable(NULL)) |
866 | return -EPERM; | |
b5e95b48 JJ |
867 | return param_get_uint(buffer, kp); |
868 | } | |
869 | ||
870 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
871 | { | |
b5e95b48 JJ |
872 | if (!apparmor_enabled) |
873 | return -EINVAL; | |
545de8fe JJ |
874 | if (apparmor_initialized && !policy_view_capable(NULL)) |
875 | return -EPERM; | |
b5e95b48 JJ |
876 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
877 | } | |
878 | ||
879 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
880 | { | |
881 | int i; | |
b5e95b48 JJ |
882 | |
883 | if (!apparmor_enabled) | |
884 | return -EINVAL; | |
b5e95b48 JJ |
885 | if (!val) |
886 | return -EINVAL; | |
545de8fe JJ |
887 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
888 | return -EPERM; | |
b5e95b48 JJ |
889 | |
890 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
891 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
892 | aa_g_audit = i; | |
893 | return 0; | |
894 | } | |
895 | } | |
896 | ||
897 | return -EINVAL; | |
898 | } | |
899 | ||
900 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
901 | { | |
b5e95b48 JJ |
902 | if (!apparmor_enabled) |
903 | return -EINVAL; | |
545de8fe JJ |
904 | if (apparmor_initialized && !policy_view_capable(NULL)) |
905 | return -EPERM; | |
b5e95b48 | 906 | |
0d259f04 | 907 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
908 | } |
909 | ||
910 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
911 | { | |
912 | int i; | |
b5e95b48 JJ |
913 | |
914 | if (!apparmor_enabled) | |
915 | return -EINVAL; | |
b5e95b48 JJ |
916 | if (!val) |
917 | return -EINVAL; | |
545de8fe JJ |
918 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
919 | return -EPERM; | |
b5e95b48 | 920 | |
0d259f04 JJ |
921 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
922 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
923 | aa_g_profile_mode = i; |
924 | return 0; | |
925 | } | |
926 | } | |
927 | ||
928 | return -EINVAL; | |
929 | } | |
930 | ||
931 | /* | |
932 | * AppArmor init functions | |
933 | */ | |
934 | ||
935 | /** | |
55a26ebf | 936 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
937 | * |
938 | * TODO: allow setting an alternate profile than unconfined | |
939 | */ | |
55a26ebf | 940 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
941 | { |
942 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 943 | struct aa_task_ctx *ctx; |
b5e95b48 | 944 | |
55a26ebf JJ |
945 | ctx = aa_alloc_task_context(GFP_KERNEL); |
946 | if (!ctx) | |
b5e95b48 JJ |
947 | return -ENOMEM; |
948 | ||
637f688d | 949 | ctx->label = aa_get_label(ns_unconfined(root_ns)); |
55a26ebf | 950 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
951 | |
952 | return 0; | |
953 | } | |
954 | ||
d4669f0b JJ |
955 | static void destroy_buffers(void) |
956 | { | |
957 | u32 i, j; | |
958 | ||
959 | for_each_possible_cpu(i) { | |
960 | for_each_cpu_buffer(j) { | |
961 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
962 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
963 | } | |
964 | } | |
965 | } | |
966 | ||
967 | static int __init alloc_buffers(void) | |
968 | { | |
969 | u32 i, j; | |
970 | ||
971 | for_each_possible_cpu(i) { | |
972 | for_each_cpu_buffer(j) { | |
973 | char *buffer; | |
974 | ||
975 | if (cpu_to_node(i) > num_online_nodes()) | |
976 | /* fallback to kmalloc for offline nodes */ | |
977 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
978 | else | |
979 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
980 | cpu_to_node(i)); | |
981 | if (!buffer) { | |
982 | destroy_buffers(); | |
983 | return -ENOMEM; | |
984 | } | |
985 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
986 | } | |
987 | } | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
e3ea1ca5 TH |
992 | #ifdef CONFIG_SYSCTL |
993 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
994 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
995 | { | |
996 | if (!policy_admin_capable(NULL)) | |
997 | return -EPERM; | |
998 | if (!apparmor_enabled) | |
999 | return -EINVAL; | |
1000 | ||
1001 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
1002 | } | |
1003 | ||
1004 | static struct ctl_path apparmor_sysctl_path[] = { | |
1005 | { .procname = "kernel", }, | |
1006 | { } | |
1007 | }; | |
1008 | ||
1009 | static struct ctl_table apparmor_sysctl_table[] = { | |
1010 | { | |
1011 | .procname = "unprivileged_userns_apparmor_policy", | |
1012 | .data = &unprivileged_userns_apparmor_policy, | |
1013 | .maxlen = sizeof(int), | |
1014 | .mode = 0600, | |
1015 | .proc_handler = apparmor_dointvec, | |
1016 | }, | |
1017 | { } | |
1018 | }; | |
1019 | ||
1020 | static int __init apparmor_init_sysctl(void) | |
1021 | { | |
1022 | return register_sysctl_paths(apparmor_sysctl_path, | |
1023 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1024 | } | |
1025 | #else | |
1026 | static inline int apparmor_init_sysctl(void) | |
1027 | { | |
1028 | return 0; | |
1029 | } | |
1030 | #endif /* CONFIG_SYSCTL */ | |
1031 | ||
b5e95b48 JJ |
1032 | static int __init apparmor_init(void) |
1033 | { | |
1034 | int error; | |
1035 | ||
b1d9e6b0 | 1036 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
1037 | aa_info_message("AppArmor disabled by boot time parameter"); |
1038 | apparmor_enabled = 0; | |
1039 | return 0; | |
1040 | } | |
1041 | ||
11c236b8 JJ |
1042 | error = aa_setup_dfa_engine(); |
1043 | if (error) { | |
1044 | AA_ERROR("Unable to setup dfa engine\n"); | |
1045 | goto alloc_out; | |
1046 | } | |
1047 | ||
b5e95b48 JJ |
1048 | error = aa_alloc_root_ns(); |
1049 | if (error) { | |
1050 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1051 | goto alloc_out; | |
1052 | } | |
1053 | ||
e3ea1ca5 TH |
1054 | error = apparmor_init_sysctl(); |
1055 | if (error) { | |
1056 | AA_ERROR("Unable to register sysctls\n"); | |
1057 | goto alloc_out; | |
1058 | ||
1059 | } | |
1060 | ||
d4669f0b JJ |
1061 | error = alloc_buffers(); |
1062 | if (error) { | |
1063 | AA_ERROR("Unable to allocate work buffers\n"); | |
1064 | goto buffers_out; | |
1065 | } | |
1066 | ||
55a26ebf | 1067 | error = set_init_ctx(); |
b5e95b48 JJ |
1068 | if (error) { |
1069 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1070 | aa_free_root_ns(); |
d4669f0b | 1071 | goto buffers_out; |
b5e95b48 | 1072 | } |
d69dece5 CS |
1073 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1074 | "apparmor"); | |
b5e95b48 JJ |
1075 | |
1076 | /* Report that AppArmor successfully initialized */ | |
1077 | apparmor_initialized = 1; | |
1078 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1079 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1080 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1081 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1082 | else | |
1083 | aa_info_message("AppArmor initialized"); | |
1084 | ||
1085 | return error; | |
1086 | ||
d4669f0b JJ |
1087 | buffers_out: |
1088 | destroy_buffers(); | |
1089 | ||
b5e95b48 JJ |
1090 | alloc_out: |
1091 | aa_destroy_aafs(); | |
11c236b8 | 1092 | aa_teardown_dfa_engine(); |
b5e95b48 JJ |
1093 | |
1094 | apparmor_enabled = 0; | |
1095 | return error; | |
b5e95b48 JJ |
1096 | } |
1097 | ||
1098 | security_initcall(apparmor_init); |