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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
20ca73bc | 6 | * Copyright (C) 2005, 2006 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
20ca73bc GW |
32 | * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, |
33 | * 2006. | |
34 | * | |
b63862f4 DK |
35 | * The support of additional filter rules compares (>, <, >=, <=) was |
36 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
37 | * | |
73241ccc AG |
38 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
39 | * filesystem information. | |
8c8570fb DK |
40 | * |
41 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
42 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
43 | */ |
44 | ||
f952d10f RGB |
45 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
46 | ||
1da177e4 | 47 | #include <linux/init.h> |
1da177e4 | 48 | #include <asm/types.h> |
60063497 | 49 | #include <linux/atomic.h> |
73241ccc AG |
50 | #include <linux/fs.h> |
51 | #include <linux/namei.h> | |
1da177e4 | 52 | #include <linux/mm.h> |
9984de1a | 53 | #include <linux/export.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
01116105 | 55 | #include <linux/mount.h> |
3ec3b2fb | 56 | #include <linux/socket.h> |
20ca73bc | 57 | #include <linux/mqueue.h> |
1da177e4 LT |
58 | #include <linux/audit.h> |
59 | #include <linux/personality.h> | |
60 | #include <linux/time.h> | |
5bb289b5 | 61 | #include <linux/netlink.h> |
f5561964 | 62 | #include <linux/compiler.h> |
1da177e4 | 63 | #include <asm/unistd.h> |
8c8570fb | 64 | #include <linux/security.h> |
fe7752ba | 65 | #include <linux/list.h> |
473ae30b | 66 | #include <linux/binfmts.h> |
a1f8e7f7 | 67 | #include <linux/highmem.h> |
f46038ff | 68 | #include <linux/syscalls.h> |
84db564a | 69 | #include <asm/syscall.h> |
851f7ff5 | 70 | #include <linux/capability.h> |
5ad4e53b | 71 | #include <linux/fs_struct.h> |
3dc1c1b2 | 72 | #include <linux/compat.h> |
3f1c8250 | 73 | #include <linux/ctype.h> |
fcf22d82 | 74 | #include <linux/string.h> |
43761473 | 75 | #include <linux/uaccess.h> |
9dd813c1 | 76 | #include <linux/fsnotify_backend.h> |
fcf22d82 | 77 | #include <uapi/linux/limits.h> |
1da177e4 | 78 | |
fe7752ba | 79 | #include "audit.h" |
1da177e4 | 80 | |
d7e7528b EP |
81 | /* flags stating the success for a syscall */ |
82 | #define AUDITSC_INVALID 0 | |
83 | #define AUDITSC_SUCCESS 1 | |
84 | #define AUDITSC_FAILURE 2 | |
85 | ||
43761473 PM |
86 | /* no execve audit message should be longer than this (userspace limits), |
87 | * see the note near the top of audit_log_execve_info() about this value */ | |
de6bbd1d EP |
88 | #define MAX_EXECVE_AUDIT_LEN 7500 |
89 | ||
3f1c8250 WR |
90 | /* max length to print of cmdline/proctitle value during audit */ |
91 | #define MAX_PROCTITLE_AUDIT_LEN 128 | |
92 | ||
471a5c7c AV |
93 | /* number of audit rules */ |
94 | int audit_n_rules; | |
95 | ||
e54dc243 AG |
96 | /* determines whether we collect data for signals sent */ |
97 | int audit_signals; | |
98 | ||
1da177e4 LT |
99 | struct audit_aux_data { |
100 | struct audit_aux_data *next; | |
101 | int type; | |
102 | }; | |
103 | ||
104 | #define AUDIT_AUX_IPCPERM 0 | |
105 | ||
e54dc243 AG |
106 | /* Number of target pids per aux struct. */ |
107 | #define AUDIT_AUX_PIDS 16 | |
108 | ||
e54dc243 AG |
109 | struct audit_aux_data_pids { |
110 | struct audit_aux_data d; | |
111 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
e1760bd5 | 112 | kuid_t target_auid[AUDIT_AUX_PIDS]; |
cca080d9 | 113 | kuid_t target_uid[AUDIT_AUX_PIDS]; |
4746ec5b | 114 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 115 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 116 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
117 | int pid_count; |
118 | }; | |
119 | ||
3fc689e9 EP |
120 | struct audit_aux_data_bprm_fcaps { |
121 | struct audit_aux_data d; | |
122 | struct audit_cap_data fcap; | |
123 | unsigned int fcap_ver; | |
124 | struct audit_cap_data old_pcap; | |
125 | struct audit_cap_data new_pcap; | |
126 | }; | |
127 | ||
74c3cbe3 AV |
128 | struct audit_tree_refs { |
129 | struct audit_tree_refs *next; | |
130 | struct audit_chunk *c[31]; | |
131 | }; | |
132 | ||
55669bfa AV |
133 | static int audit_match_perm(struct audit_context *ctx, int mask) |
134 | { | |
c4bacefb | 135 | unsigned n; |
1a61c88d | 136 | if (unlikely(!ctx)) |
137 | return 0; | |
c4bacefb | 138 | n = ctx->major; |
dbda4c0b | 139 | |
55669bfa AV |
140 | switch (audit_classify_syscall(ctx->arch, n)) { |
141 | case 0: /* native */ | |
142 | if ((mask & AUDIT_PERM_WRITE) && | |
143 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
144 | return 1; | |
145 | if ((mask & AUDIT_PERM_READ) && | |
146 | audit_match_class(AUDIT_CLASS_READ, n)) | |
147 | return 1; | |
148 | if ((mask & AUDIT_PERM_ATTR) && | |
149 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
150 | return 1; | |
151 | return 0; | |
152 | case 1: /* 32bit on biarch */ | |
153 | if ((mask & AUDIT_PERM_WRITE) && | |
154 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
155 | return 1; | |
156 | if ((mask & AUDIT_PERM_READ) && | |
157 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
158 | return 1; | |
159 | if ((mask & AUDIT_PERM_ATTR) && | |
160 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
161 | return 1; | |
162 | return 0; | |
163 | case 2: /* open */ | |
164 | return mask & ACC_MODE(ctx->argv[1]); | |
165 | case 3: /* openat */ | |
166 | return mask & ACC_MODE(ctx->argv[2]); | |
167 | case 4: /* socketcall */ | |
168 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
169 | case 5: /* execve */ | |
170 | return mask & AUDIT_PERM_EXEC; | |
171 | default: | |
172 | return 0; | |
173 | } | |
174 | } | |
175 | ||
5ef30ee5 | 176 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 177 | { |
5195d8e2 | 178 | struct audit_names *n; |
5ef30ee5 | 179 | umode_t mode = (umode_t)val; |
1a61c88d | 180 | |
181 | if (unlikely(!ctx)) | |
182 | return 0; | |
183 | ||
5195d8e2 | 184 | list_for_each_entry(n, &ctx->names_list, list) { |
84cb777e | 185 | if ((n->ino != AUDIT_INO_UNSET) && |
5195d8e2 | 186 | ((n->mode & S_IFMT) == mode)) |
5ef30ee5 EP |
187 | return 1; |
188 | } | |
5195d8e2 | 189 | |
5ef30ee5 | 190 | return 0; |
8b67dca9 AV |
191 | } |
192 | ||
74c3cbe3 AV |
193 | /* |
194 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
195 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
196 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
197 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
198 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
199 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
200 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
201 | */ | |
202 | ||
679173b7 EP |
203 | static void audit_set_auditable(struct audit_context *ctx) |
204 | { | |
205 | if (!ctx->prio) { | |
206 | ctx->prio = 1; | |
207 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
208 | } | |
209 | } | |
210 | ||
74c3cbe3 AV |
211 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
212 | { | |
213 | struct audit_tree_refs *p = ctx->trees; | |
214 | int left = ctx->tree_count; | |
215 | if (likely(left)) { | |
216 | p->c[--left] = chunk; | |
217 | ctx->tree_count = left; | |
218 | return 1; | |
219 | } | |
220 | if (!p) | |
221 | return 0; | |
222 | p = p->next; | |
223 | if (p) { | |
224 | p->c[30] = chunk; | |
225 | ctx->trees = p; | |
226 | ctx->tree_count = 30; | |
227 | return 1; | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static int grow_tree_refs(struct audit_context *ctx) | |
233 | { | |
234 | struct audit_tree_refs *p = ctx->trees; | |
235 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
236 | if (!ctx->trees) { | |
237 | ctx->trees = p; | |
238 | return 0; | |
239 | } | |
240 | if (p) | |
241 | p->next = ctx->trees; | |
242 | else | |
243 | ctx->first_trees = ctx->trees; | |
244 | ctx->tree_count = 31; | |
245 | return 1; | |
246 | } | |
74c3cbe3 AV |
247 | |
248 | static void unroll_tree_refs(struct audit_context *ctx, | |
249 | struct audit_tree_refs *p, int count) | |
250 | { | |
74c3cbe3 AV |
251 | struct audit_tree_refs *q; |
252 | int n; | |
253 | if (!p) { | |
254 | /* we started with empty chain */ | |
255 | p = ctx->first_trees; | |
256 | count = 31; | |
257 | /* if the very first allocation has failed, nothing to do */ | |
258 | if (!p) | |
259 | return; | |
260 | } | |
261 | n = count; | |
262 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
263 | while (n--) { | |
264 | audit_put_chunk(q->c[n]); | |
265 | q->c[n] = NULL; | |
266 | } | |
267 | } | |
268 | while (n-- > ctx->tree_count) { | |
269 | audit_put_chunk(q->c[n]); | |
270 | q->c[n] = NULL; | |
271 | } | |
272 | ctx->trees = p; | |
273 | ctx->tree_count = count; | |
74c3cbe3 AV |
274 | } |
275 | ||
276 | static void free_tree_refs(struct audit_context *ctx) | |
277 | { | |
278 | struct audit_tree_refs *p, *q; | |
279 | for (p = ctx->first_trees; p; p = q) { | |
280 | q = p->next; | |
281 | kfree(p); | |
282 | } | |
283 | } | |
284 | ||
285 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
286 | { | |
74c3cbe3 AV |
287 | struct audit_tree_refs *p; |
288 | int n; | |
289 | if (!tree) | |
290 | return 0; | |
291 | /* full ones */ | |
292 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
293 | for (n = 0; n < 31; n++) | |
294 | if (audit_tree_match(p->c[n], tree)) | |
295 | return 1; | |
296 | } | |
297 | /* partial */ | |
298 | if (p) { | |
299 | for (n = ctx->tree_count; n < 31; n++) | |
300 | if (audit_tree_match(p->c[n], tree)) | |
301 | return 1; | |
302 | } | |
74c3cbe3 AV |
303 | return 0; |
304 | } | |
305 | ||
ca57ec0f EB |
306 | static int audit_compare_uid(kuid_t uid, |
307 | struct audit_names *name, | |
308 | struct audit_field *f, | |
309 | struct audit_context *ctx) | |
b34b0393 EP |
310 | { |
311 | struct audit_names *n; | |
b34b0393 | 312 | int rc; |
ca57ec0f | 313 | |
b34b0393 | 314 | if (name) { |
ca57ec0f | 315 | rc = audit_uid_comparator(uid, f->op, name->uid); |
b34b0393 EP |
316 | if (rc) |
317 | return rc; | |
318 | } | |
ca57ec0f | 319 | |
b34b0393 EP |
320 | if (ctx) { |
321 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f EB |
322 | rc = audit_uid_comparator(uid, f->op, n->uid); |
323 | if (rc) | |
324 | return rc; | |
325 | } | |
326 | } | |
327 | return 0; | |
328 | } | |
b34b0393 | 329 | |
ca57ec0f EB |
330 | static int audit_compare_gid(kgid_t gid, |
331 | struct audit_names *name, | |
332 | struct audit_field *f, | |
333 | struct audit_context *ctx) | |
334 | { | |
335 | struct audit_names *n; | |
336 | int rc; | |
337 | ||
338 | if (name) { | |
339 | rc = audit_gid_comparator(gid, f->op, name->gid); | |
340 | if (rc) | |
341 | return rc; | |
342 | } | |
343 | ||
344 | if (ctx) { | |
345 | list_for_each_entry(n, &ctx->names_list, list) { | |
346 | rc = audit_gid_comparator(gid, f->op, n->gid); | |
b34b0393 EP |
347 | if (rc) |
348 | return rc; | |
349 | } | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
02d86a56 EP |
354 | static int audit_field_compare(struct task_struct *tsk, |
355 | const struct cred *cred, | |
356 | struct audit_field *f, | |
357 | struct audit_context *ctx, | |
358 | struct audit_names *name) | |
359 | { | |
02d86a56 | 360 | switch (f->val) { |
4a6633ed | 361 | /* process to file object comparisons */ |
02d86a56 | 362 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
ca57ec0f | 363 | return audit_compare_uid(cred->uid, name, f, ctx); |
c9fe685f | 364 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
ca57ec0f | 365 | return audit_compare_gid(cred->gid, name, f, ctx); |
4a6633ed | 366 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
ca57ec0f | 367 | return audit_compare_uid(cred->euid, name, f, ctx); |
4a6633ed | 368 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
ca57ec0f | 369 | return audit_compare_gid(cred->egid, name, f, ctx); |
4a6633ed | 370 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
38f80590 | 371 | return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx); |
4a6633ed | 372 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
ca57ec0f | 373 | return audit_compare_uid(cred->suid, name, f, ctx); |
4a6633ed | 374 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
ca57ec0f | 375 | return audit_compare_gid(cred->sgid, name, f, ctx); |
4a6633ed | 376 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
ca57ec0f | 377 | return audit_compare_uid(cred->fsuid, name, f, ctx); |
4a6633ed | 378 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
ca57ec0f | 379 | return audit_compare_gid(cred->fsgid, name, f, ctx); |
10d68360 PM |
380 | /* uid comparisons */ |
381 | case AUDIT_COMPARE_UID_TO_AUID: | |
38f80590 RGB |
382 | return audit_uid_comparator(cred->uid, f->op, |
383 | audit_get_loginuid(tsk)); | |
10d68360 | 384 | case AUDIT_COMPARE_UID_TO_EUID: |
ca57ec0f | 385 | return audit_uid_comparator(cred->uid, f->op, cred->euid); |
10d68360 | 386 | case AUDIT_COMPARE_UID_TO_SUID: |
ca57ec0f | 387 | return audit_uid_comparator(cred->uid, f->op, cred->suid); |
10d68360 | 388 | case AUDIT_COMPARE_UID_TO_FSUID: |
ca57ec0f | 389 | return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
10d68360 PM |
390 | /* auid comparisons */ |
391 | case AUDIT_COMPARE_AUID_TO_EUID: | |
38f80590 RGB |
392 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
393 | cred->euid); | |
10d68360 | 394 | case AUDIT_COMPARE_AUID_TO_SUID: |
38f80590 RGB |
395 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
396 | cred->suid); | |
10d68360 | 397 | case AUDIT_COMPARE_AUID_TO_FSUID: |
38f80590 RGB |
398 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
399 | cred->fsuid); | |
10d68360 PM |
400 | /* euid comparisons */ |
401 | case AUDIT_COMPARE_EUID_TO_SUID: | |
ca57ec0f | 402 | return audit_uid_comparator(cred->euid, f->op, cred->suid); |
10d68360 | 403 | case AUDIT_COMPARE_EUID_TO_FSUID: |
ca57ec0f | 404 | return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
10d68360 PM |
405 | /* suid comparisons */ |
406 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
ca57ec0f | 407 | return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
10d68360 PM |
408 | /* gid comparisons */ |
409 | case AUDIT_COMPARE_GID_TO_EGID: | |
ca57ec0f | 410 | return audit_gid_comparator(cred->gid, f->op, cred->egid); |
10d68360 | 411 | case AUDIT_COMPARE_GID_TO_SGID: |
ca57ec0f | 412 | return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
10d68360 | 413 | case AUDIT_COMPARE_GID_TO_FSGID: |
ca57ec0f | 414 | return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
10d68360 PM |
415 | /* egid comparisons */ |
416 | case AUDIT_COMPARE_EGID_TO_SGID: | |
ca57ec0f | 417 | return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
10d68360 | 418 | case AUDIT_COMPARE_EGID_TO_FSGID: |
ca57ec0f | 419 | return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
10d68360 PM |
420 | /* sgid comparison */ |
421 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
ca57ec0f | 422 | return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
02d86a56 EP |
423 | default: |
424 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
425 | return 0; | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | ||
f368c07d | 430 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 431 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
432 | * otherwise. |
433 | * | |
434 | * If task_creation is true, this is an explicit indication that we are | |
435 | * filtering a task rule at task creation time. This and tsk == current are | |
436 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
437 | */ | |
1da177e4 | 438 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 439 | struct audit_krule *rule, |
1da177e4 | 440 | struct audit_context *ctx, |
f368c07d | 441 | struct audit_names *name, |
f5629883 TJ |
442 | enum audit_state *state, |
443 | bool task_creation) | |
1da177e4 | 444 | { |
f5629883 | 445 | const struct cred *cred; |
5195d8e2 | 446 | int i, need_sid = 1; |
3dc7e315 | 447 | u32 sid; |
8fae4770 | 448 | unsigned int sessionid; |
3dc7e315 | 449 | |
f5629883 TJ |
450 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
451 | ||
1da177e4 | 452 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 453 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 454 | struct audit_names *n; |
1da177e4 | 455 | int result = 0; |
f1dc4867 | 456 | pid_t pid; |
1da177e4 | 457 | |
93315ed6 | 458 | switch (f->type) { |
1da177e4 | 459 | case AUDIT_PID: |
fa2bea2f | 460 | pid = task_tgid_nr(tsk); |
f1dc4867 | 461 | result = audit_comparator(pid, f->op, f->val); |
1da177e4 | 462 | break; |
3c66251e | 463 | case AUDIT_PPID: |
419c58f1 AV |
464 | if (ctx) { |
465 | if (!ctx->ppid) | |
c92cdeb4 | 466 | ctx->ppid = task_ppid_nr(tsk); |
3c66251e | 467 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 468 | } |
3c66251e | 469 | break; |
34d99af5 RGB |
470 | case AUDIT_EXE: |
471 | result = audit_exe_compare(tsk, rule->exe); | |
23bcc480 OM |
472 | if (f->op == Audit_not_equal) |
473 | result = !result; | |
34d99af5 | 474 | break; |
1da177e4 | 475 | case AUDIT_UID: |
ca57ec0f | 476 | result = audit_uid_comparator(cred->uid, f->op, f->uid); |
1da177e4 LT |
477 | break; |
478 | case AUDIT_EUID: | |
ca57ec0f | 479 | result = audit_uid_comparator(cred->euid, f->op, f->uid); |
1da177e4 LT |
480 | break; |
481 | case AUDIT_SUID: | |
ca57ec0f | 482 | result = audit_uid_comparator(cred->suid, f->op, f->uid); |
1da177e4 LT |
483 | break; |
484 | case AUDIT_FSUID: | |
ca57ec0f | 485 | result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
1da177e4 LT |
486 | break; |
487 | case AUDIT_GID: | |
ca57ec0f | 488 | result = audit_gid_comparator(cred->gid, f->op, f->gid); |
37eebe39 MI |
489 | if (f->op == Audit_equal) { |
490 | if (!result) | |
af85d177 | 491 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
492 | } else if (f->op == Audit_not_equal) { |
493 | if (result) | |
af85d177 | 494 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 495 | } |
1da177e4 LT |
496 | break; |
497 | case AUDIT_EGID: | |
ca57ec0f | 498 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39 MI |
499 | if (f->op == Audit_equal) { |
500 | if (!result) | |
af85d177 | 501 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
502 | } else if (f->op == Audit_not_equal) { |
503 | if (result) | |
af85d177 | 504 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 505 | } |
1da177e4 LT |
506 | break; |
507 | case AUDIT_SGID: | |
ca57ec0f | 508 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
509 | break; |
510 | case AUDIT_FSGID: | |
ca57ec0f | 511 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 | 512 | break; |
8fae4770 | 513 | case AUDIT_SESSIONID: |
5b713886 | 514 | sessionid = audit_get_sessionid(tsk); |
8fae4770 RGB |
515 | result = audit_comparator(sessionid, f->op, f->val); |
516 | break; | |
1da177e4 | 517 | case AUDIT_PERS: |
93315ed6 | 518 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 519 | break; |
2fd6f58b | 520 | case AUDIT_ARCH: |
9f8dbe9c | 521 | if (ctx) |
93315ed6 | 522 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 523 | break; |
1da177e4 LT |
524 | |
525 | case AUDIT_EXIT: | |
526 | if (ctx && ctx->return_valid) | |
93315ed6 | 527 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
528 | break; |
529 | case AUDIT_SUCCESS: | |
b01f2cc1 | 530 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
531 | if (f->val) |
532 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 533 | else |
93315ed6 | 534 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 535 | } |
1da177e4 LT |
536 | break; |
537 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
538 | if (name) { |
539 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
540 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
541 | ++result; | |
542 | } else if (ctx) { | |
5195d8e2 | 543 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
544 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
545 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
546 | ++result; |
547 | break; | |
548 | } | |
549 | } | |
550 | } | |
551 | break; | |
552 | case AUDIT_DEVMINOR: | |
16c174bd EP |
553 | if (name) { |
554 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
555 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
556 | ++result; | |
557 | } else if (ctx) { | |
5195d8e2 | 558 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
559 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
560 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
561 | ++result; |
562 | break; | |
563 | } | |
564 | } | |
565 | } | |
566 | break; | |
567 | case AUDIT_INODE: | |
f368c07d | 568 | if (name) |
db510fc5 | 569 | result = audit_comparator(name->ino, f->op, f->val); |
f368c07d | 570 | else if (ctx) { |
5195d8e2 EP |
571 | list_for_each_entry(n, &ctx->names_list, list) { |
572 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
573 | ++result; |
574 | break; | |
575 | } | |
576 | } | |
577 | } | |
578 | break; | |
efaffd6e EP |
579 | case AUDIT_OBJ_UID: |
580 | if (name) { | |
ca57ec0f | 581 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
582 | } else if (ctx) { |
583 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 584 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
585 | ++result; |
586 | break; | |
587 | } | |
588 | } | |
589 | } | |
590 | break; | |
54d3218b EP |
591 | case AUDIT_OBJ_GID: |
592 | if (name) { | |
ca57ec0f | 593 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
594 | } else if (ctx) { |
595 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 596 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
597 | ++result; |
598 | break; | |
599 | } | |
600 | } | |
601 | } | |
602 | break; | |
f368c07d | 603 | case AUDIT_WATCH: |
ae7b8f41 EP |
604 | if (name) |
605 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 606 | break; |
74c3cbe3 AV |
607 | case AUDIT_DIR: |
608 | if (ctx) | |
609 | result = match_tree_refs(ctx, rule->tree); | |
610 | break; | |
1da177e4 | 611 | case AUDIT_LOGINUID: |
38f80590 RGB |
612 | result = audit_uid_comparator(audit_get_loginuid(tsk), |
613 | f->op, f->uid); | |
1da177e4 | 614 | break; |
780a7654 EB |
615 | case AUDIT_LOGINUID_SET: |
616 | result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); | |
617 | break; | |
3a6b9f85 DG |
618 | case AUDIT_SUBJ_USER: |
619 | case AUDIT_SUBJ_ROLE: | |
620 | case AUDIT_SUBJ_TYPE: | |
621 | case AUDIT_SUBJ_SEN: | |
622 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
623 | /* NOTE: this may return negative values indicating |
624 | a temporary error. We simply treat this as a | |
625 | match for now to avoid losing information that | |
626 | may be wanted. An error message will also be | |
627 | logged upon error */ | |
04305e4a | 628 | if (f->lsm_rule) { |
2ad312d2 | 629 | if (need_sid) { |
2a862b32 | 630 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
631 | need_sid = 0; |
632 | } | |
d7a96f3a | 633 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 634 | f->op, |
04305e4a | 635 | f->lsm_rule, |
3dc7e315 | 636 | ctx); |
2ad312d2 | 637 | } |
3dc7e315 | 638 | break; |
6e5a2d1d DG |
639 | case AUDIT_OBJ_USER: |
640 | case AUDIT_OBJ_ROLE: | |
641 | case AUDIT_OBJ_TYPE: | |
642 | case AUDIT_OBJ_LEV_LOW: | |
643 | case AUDIT_OBJ_LEV_HIGH: | |
644 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
645 | also applies here */ | |
04305e4a | 646 | if (f->lsm_rule) { |
6e5a2d1d DG |
647 | /* Find files that match */ |
648 | if (name) { | |
d7a96f3a | 649 | result = security_audit_rule_match( |
6e5a2d1d | 650 | name->osid, f->type, f->op, |
04305e4a | 651 | f->lsm_rule, ctx); |
6e5a2d1d | 652 | } else if (ctx) { |
5195d8e2 EP |
653 | list_for_each_entry(n, &ctx->names_list, list) { |
654 | if (security_audit_rule_match(n->osid, f->type, | |
655 | f->op, f->lsm_rule, | |
656 | ctx)) { | |
6e5a2d1d DG |
657 | ++result; |
658 | break; | |
659 | } | |
660 | } | |
661 | } | |
662 | /* Find ipc objects that match */ | |
a33e6751 AV |
663 | if (!ctx || ctx->type != AUDIT_IPC) |
664 | break; | |
665 | if (security_audit_rule_match(ctx->ipc.osid, | |
666 | f->type, f->op, | |
667 | f->lsm_rule, ctx)) | |
668 | ++result; | |
6e5a2d1d DG |
669 | } |
670 | break; | |
1da177e4 LT |
671 | case AUDIT_ARG0: |
672 | case AUDIT_ARG1: | |
673 | case AUDIT_ARG2: | |
674 | case AUDIT_ARG3: | |
675 | if (ctx) | |
93315ed6 | 676 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 677 | break; |
5adc8a6a AG |
678 | case AUDIT_FILTERKEY: |
679 | /* ignore this field for filtering */ | |
680 | result = 1; | |
681 | break; | |
55669bfa AV |
682 | case AUDIT_PERM: |
683 | result = audit_match_perm(ctx, f->val); | |
684 | break; | |
8b67dca9 AV |
685 | case AUDIT_FILETYPE: |
686 | result = audit_match_filetype(ctx, f->val); | |
687 | break; | |
02d86a56 EP |
688 | case AUDIT_FIELD_COMPARE: |
689 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
690 | break; | |
1da177e4 | 691 | } |
f5629883 | 692 | if (!result) |
1da177e4 LT |
693 | return 0; |
694 | } | |
0590b933 AV |
695 | |
696 | if (ctx) { | |
697 | if (rule->prio <= ctx->prio) | |
698 | return 0; | |
699 | if (rule->filterkey) { | |
700 | kfree(ctx->filterkey); | |
701 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
702 | } | |
703 | ctx->prio = rule->prio; | |
704 | } | |
1da177e4 | 705 | switch (rule->action) { |
66b12abc PM |
706 | case AUDIT_NEVER: |
707 | *state = AUDIT_DISABLED; | |
708 | break; | |
709 | case AUDIT_ALWAYS: | |
710 | *state = AUDIT_RECORD_CONTEXT; | |
711 | break; | |
1da177e4 LT |
712 | } |
713 | return 1; | |
714 | } | |
715 | ||
716 | /* At process creation time, we can determine if system-call auditing is | |
717 | * completely disabled for this task. Since we only have the task | |
718 | * structure at this point, we can only check uid and gid. | |
719 | */ | |
e048e02c | 720 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
721 | { |
722 | struct audit_entry *e; | |
723 | enum audit_state state; | |
724 | ||
725 | rcu_read_lock(); | |
0f45aa18 | 726 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
727 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
728 | &state, true)) { | |
e048e02c AV |
729 | if (state == AUDIT_RECORD_CONTEXT) |
730 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
731 | rcu_read_unlock(); |
732 | return state; | |
733 | } | |
734 | } | |
735 | rcu_read_unlock(); | |
736 | return AUDIT_BUILD_CONTEXT; | |
737 | } | |
738 | ||
a3c54931 AL |
739 | static int audit_in_mask(const struct audit_krule *rule, unsigned long val) |
740 | { | |
741 | int word, bit; | |
742 | ||
743 | if (val > 0xffffffff) | |
744 | return false; | |
745 | ||
746 | word = AUDIT_WORD(val); | |
747 | if (word >= AUDIT_BITMASK_SIZE) | |
748 | return false; | |
749 | ||
750 | bit = AUDIT_BIT(val); | |
751 | ||
752 | return rule->mask[word] & bit; | |
753 | } | |
754 | ||
1da177e4 LT |
755 | /* At syscall entry and exit time, this filter is called if the |
756 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 757 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 758 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
759 | */ |
760 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
761 | struct audit_context *ctx, | |
762 | struct list_head *list) | |
763 | { | |
764 | struct audit_entry *e; | |
c3896495 | 765 | enum audit_state state; |
1da177e4 | 766 | |
5b52330b | 767 | if (auditd_test_task(tsk)) |
f7056d64 DW |
768 | return AUDIT_DISABLED; |
769 | ||
1da177e4 | 770 | rcu_read_lock(); |
c3896495 | 771 | if (!list_empty(list)) { |
b63862f4 | 772 | list_for_each_entry_rcu(e, list, list) { |
a3c54931 | 773 | if (audit_in_mask(&e->rule, ctx->major) && |
f368c07d | 774 | audit_filter_rules(tsk, &e->rule, ctx, NULL, |
f5629883 | 775 | &state, false)) { |
f368c07d | 776 | rcu_read_unlock(); |
0590b933 | 777 | ctx->current_state = state; |
f368c07d AG |
778 | return state; |
779 | } | |
780 | } | |
781 | } | |
782 | rcu_read_unlock(); | |
783 | return AUDIT_BUILD_CONTEXT; | |
784 | } | |
785 | ||
5195d8e2 EP |
786 | /* |
787 | * Given an audit_name check the inode hash table to see if they match. | |
788 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
789 | */ | |
790 | static int audit_filter_inode_name(struct task_struct *tsk, | |
791 | struct audit_names *n, | |
792 | struct audit_context *ctx) { | |
5195d8e2 EP |
793 | int h = audit_hash_ino((u32)n->ino); |
794 | struct list_head *list = &audit_inode_hash[h]; | |
795 | struct audit_entry *e; | |
796 | enum audit_state state; | |
797 | ||
5195d8e2 EP |
798 | if (list_empty(list)) |
799 | return 0; | |
800 | ||
801 | list_for_each_entry_rcu(e, list, list) { | |
a3c54931 | 802 | if (audit_in_mask(&e->rule, ctx->major) && |
5195d8e2 EP |
803 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { |
804 | ctx->current_state = state; | |
805 | return 1; | |
806 | } | |
807 | } | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
812 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 813 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 814 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
815 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
816 | */ | |
0590b933 | 817 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 818 | { |
5195d8e2 | 819 | struct audit_names *n; |
f368c07d | 820 | |
5b52330b | 821 | if (auditd_test_task(tsk)) |
0590b933 | 822 | return; |
f368c07d AG |
823 | |
824 | rcu_read_lock(); | |
f368c07d | 825 | |
5195d8e2 EP |
826 | list_for_each_entry(n, &ctx->names_list, list) { |
827 | if (audit_filter_inode_name(tsk, n, ctx)) | |
828 | break; | |
0f45aa18 DW |
829 | } |
830 | rcu_read_unlock(); | |
0f45aa18 DW |
831 | } |
832 | ||
4a3eb726 RGB |
833 | /* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */ |
834 | static inline struct audit_context *audit_take_context(struct task_struct *tsk, | |
1da177e4 | 835 | int return_valid, |
6d208da8 | 836 | long return_code) |
1da177e4 LT |
837 | { |
838 | struct audit_context *context = tsk->audit_context; | |
839 | ||
56179a6e | 840 | if (!context) |
1da177e4 LT |
841 | return NULL; |
842 | context->return_valid = return_valid; | |
f701b75e EP |
843 | |
844 | /* | |
845 | * we need to fix up the return code in the audit logs if the actual | |
846 | * return codes are later going to be fixed up by the arch specific | |
847 | * signal handlers | |
848 | * | |
849 | * This is actually a test for: | |
850 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
851 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
852 | * | |
853 | * but is faster than a bunch of || | |
854 | */ | |
855 | if (unlikely(return_code <= -ERESTARTSYS) && | |
856 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
857 | (return_code != -ENOIOCTLCMD)) | |
858 | context->return_code = -EINTR; | |
859 | else | |
860 | context->return_code = return_code; | |
1da177e4 | 861 | |
0590b933 AV |
862 | if (context->in_syscall && !context->dummy) { |
863 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
864 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
865 | } |
866 | ||
c0b0ae8a | 867 | audit_set_context(tsk, NULL); |
1da177e4 LT |
868 | return context; |
869 | } | |
870 | ||
3f1c8250 WR |
871 | static inline void audit_proctitle_free(struct audit_context *context) |
872 | { | |
873 | kfree(context->proctitle.value); | |
874 | context->proctitle.value = NULL; | |
875 | context->proctitle.len = 0; | |
876 | } | |
877 | ||
1da177e4 LT |
878 | static inline void audit_free_names(struct audit_context *context) |
879 | { | |
5195d8e2 | 880 | struct audit_names *n, *next; |
1da177e4 | 881 | |
5195d8e2 EP |
882 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
883 | list_del(&n->list); | |
55422d0b PM |
884 | if (n->name) |
885 | putname(n->name); | |
5195d8e2 EP |
886 | if (n->should_free) |
887 | kfree(n); | |
8c8570fb | 888 | } |
1da177e4 | 889 | context->name_count = 0; |
44707fdf JB |
890 | path_put(&context->pwd); |
891 | context->pwd.dentry = NULL; | |
892 | context->pwd.mnt = NULL; | |
1da177e4 LT |
893 | } |
894 | ||
895 | static inline void audit_free_aux(struct audit_context *context) | |
896 | { | |
897 | struct audit_aux_data *aux; | |
898 | ||
899 | while ((aux = context->aux)) { | |
900 | context->aux = aux->next; | |
901 | kfree(aux); | |
902 | } | |
e54dc243 AG |
903 | while ((aux = context->aux_pids)) { |
904 | context->aux_pids = aux->next; | |
905 | kfree(aux); | |
906 | } | |
1da177e4 LT |
907 | } |
908 | ||
1da177e4 LT |
909 | static inline struct audit_context *audit_alloc_context(enum audit_state state) |
910 | { | |
911 | struct audit_context *context; | |
912 | ||
17c6ee70 RM |
913 | context = kzalloc(sizeof(*context), GFP_KERNEL); |
914 | if (!context) | |
1da177e4 | 915 | return NULL; |
e2c5adc8 AM |
916 | context->state = state; |
917 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; | |
916d7576 | 918 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 919 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
920 | return context; |
921 | } | |
922 | ||
b0dd25a8 RD |
923 | /** |
924 | * audit_alloc - allocate an audit context block for a task | |
925 | * @tsk: task | |
926 | * | |
927 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
928 | * if necessary. Doing so turns on system call auditing for the |
929 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
930 | * needed. |
931 | */ | |
1da177e4 LT |
932 | int audit_alloc(struct task_struct *tsk) |
933 | { | |
934 | struct audit_context *context; | |
935 | enum audit_state state; | |
e048e02c | 936 | char *key = NULL; |
1da177e4 | 937 | |
b593d384 | 938 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
939 | return 0; /* Return if not auditing. */ |
940 | ||
e048e02c | 941 | state = audit_filter_task(tsk, &key); |
d48d8051 ON |
942 | if (state == AUDIT_DISABLED) { |
943 | clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1da177e4 | 944 | return 0; |
d48d8051 | 945 | } |
1da177e4 LT |
946 | |
947 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 948 | kfree(key); |
1da177e4 LT |
949 | audit_log_lost("out of memory in audit_alloc"); |
950 | return -ENOMEM; | |
951 | } | |
e048e02c | 952 | context->filterkey = key; |
1da177e4 | 953 | |
c0b0ae8a | 954 | audit_set_context(tsk, context); |
1da177e4 LT |
955 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); |
956 | return 0; | |
957 | } | |
958 | ||
959 | static inline void audit_free_context(struct audit_context *context) | |
960 | { | |
c62d773a AV |
961 | audit_free_names(context); |
962 | unroll_tree_refs(context, NULL, 0); | |
963 | free_tree_refs(context); | |
964 | audit_free_aux(context); | |
965 | kfree(context->filterkey); | |
966 | kfree(context->sockaddr); | |
3f1c8250 | 967 | audit_proctitle_free(context); |
c62d773a | 968 | kfree(context); |
1da177e4 LT |
969 | } |
970 | ||
e54dc243 | 971 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9 | 972 | kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b | 973 | u32 sid, char *comm) |
e54dc243 AG |
974 | { |
975 | struct audit_buffer *ab; | |
2a862b32 | 976 | char *ctx = NULL; |
e54dc243 AG |
977 | u32 len; |
978 | int rc = 0; | |
979 | ||
980 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
981 | if (!ab) | |
6246ccab | 982 | return rc; |
e54dc243 | 983 | |
e1760bd5 EB |
984 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
985 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 986 | from_kuid(&init_user_ns, uid), sessionid); |
ad395abe EP |
987 | if (sid) { |
988 | if (security_secid_to_secctx(sid, &ctx, &len)) { | |
989 | audit_log_format(ab, " obj=(none)"); | |
990 | rc = 1; | |
991 | } else { | |
992 | audit_log_format(ab, " obj=%s", ctx); | |
993 | security_release_secctx(ctx, len); | |
994 | } | |
2a862b32 | 995 | } |
c2a7780e EP |
996 | audit_log_format(ab, " ocomm="); |
997 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 998 | audit_log_end(ab); |
e54dc243 AG |
999 | |
1000 | return rc; | |
1001 | } | |
1002 | ||
43761473 PM |
1003 | static void audit_log_execve_info(struct audit_context *context, |
1004 | struct audit_buffer **ab) | |
bdf4c48a | 1005 | { |
43761473 PM |
1006 | long len_max; |
1007 | long len_rem; | |
1008 | long len_full; | |
1009 | long len_buf; | |
8443075e | 1010 | long len_abuf = 0; |
43761473 PM |
1011 | long len_tmp; |
1012 | bool require_data; | |
1013 | bool encode; | |
1014 | unsigned int iter; | |
1015 | unsigned int arg; | |
1016 | char *buf_head; | |
1017 | char *buf; | |
1018 | const char __user *p = (const char __user *)current->mm->arg_start; | |
1019 | ||
1020 | /* NOTE: this buffer needs to be large enough to hold all the non-arg | |
1021 | * data we put in the audit record for this argument (see the | |
1022 | * code below) ... at this point in time 96 is plenty */ | |
1023 | char abuf[96]; | |
1024 | ||
1025 | /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the | |
1026 | * current value of 7500 is not as important as the fact that it | |
1027 | * is less than 8k, a setting of 7500 gives us plenty of wiggle | |
1028 | * room if we go over a little bit in the logging below */ | |
1029 | WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500); | |
1030 | len_max = MAX_EXECVE_AUDIT_LEN; | |
1031 | ||
1032 | /* scratch buffer to hold the userspace args */ | |
1033 | buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1034 | if (!buf_head) { | |
1035 | audit_panic("out of memory for argv string"); | |
1036 | return; | |
de6bbd1d | 1037 | } |
43761473 | 1038 | buf = buf_head; |
040b3a2d | 1039 | |
43761473 | 1040 | audit_log_format(*ab, "argc=%d", context->execve.argc); |
040b3a2d | 1041 | |
43761473 PM |
1042 | len_rem = len_max; |
1043 | len_buf = 0; | |
1044 | len_full = 0; | |
1045 | require_data = true; | |
1046 | encode = false; | |
1047 | iter = 0; | |
1048 | arg = 0; | |
de6bbd1d | 1049 | do { |
43761473 PM |
1050 | /* NOTE: we don't ever want to trust this value for anything |
1051 | * serious, but the audit record format insists we | |
1052 | * provide an argument length for really long arguments, | |
1053 | * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but | |
1054 | * to use strncpy_from_user() to obtain this value for | |
1055 | * recording in the log, although we don't use it | |
1056 | * anywhere here to avoid a double-fetch problem */ | |
1057 | if (len_full == 0) | |
1058 | len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
1059 | ||
1060 | /* read more data from userspace */ | |
1061 | if (require_data) { | |
1062 | /* can we make more room in the buffer? */ | |
1063 | if (buf != buf_head) { | |
1064 | memmove(buf_head, buf, len_buf); | |
1065 | buf = buf_head; | |
1066 | } | |
1067 | ||
1068 | /* fetch as much as we can of the argument */ | |
1069 | len_tmp = strncpy_from_user(&buf_head[len_buf], p, | |
1070 | len_max - len_buf); | |
1071 | if (len_tmp == -EFAULT) { | |
1072 | /* unable to copy from userspace */ | |
1073 | send_sig(SIGKILL, current, 0); | |
1074 | goto out; | |
1075 | } else if (len_tmp == (len_max - len_buf)) { | |
1076 | /* buffer is not large enough */ | |
1077 | require_data = true; | |
1078 | /* NOTE: if we are going to span multiple | |
1079 | * buffers force the encoding so we stand | |
1080 | * a chance at a sane len_full value and | |
1081 | * consistent record encoding */ | |
1082 | encode = true; | |
1083 | len_full = len_full * 2; | |
1084 | p += len_tmp; | |
1085 | } else { | |
1086 | require_data = false; | |
1087 | if (!encode) | |
1088 | encode = audit_string_contains_control( | |
1089 | buf, len_tmp); | |
1090 | /* try to use a trusted value for len_full */ | |
1091 | if (len_full < len_max) | |
1092 | len_full = (encode ? | |
1093 | len_tmp * 2 : len_tmp); | |
1094 | p += len_tmp + 1; | |
1095 | } | |
1096 | len_buf += len_tmp; | |
1097 | buf_head[len_buf] = '\0'; | |
bdf4c48a | 1098 | |
43761473 PM |
1099 | /* length of the buffer in the audit record? */ |
1100 | len_abuf = (encode ? len_buf * 2 : len_buf + 2); | |
bdf4c48a | 1101 | } |
de6bbd1d | 1102 | |
43761473 | 1103 | /* write as much as we can to the audit log */ |
ea956d8b | 1104 | if (len_buf >= 0) { |
43761473 PM |
1105 | /* NOTE: some magic numbers here - basically if we |
1106 | * can't fit a reasonable amount of data into the | |
1107 | * existing audit buffer, flush it and start with | |
1108 | * a new buffer */ | |
1109 | if ((sizeof(abuf) + 8) > len_rem) { | |
1110 | len_rem = len_max; | |
1111 | audit_log_end(*ab); | |
1112 | *ab = audit_log_start(context, | |
1113 | GFP_KERNEL, AUDIT_EXECVE); | |
1114 | if (!*ab) | |
1115 | goto out; | |
1116 | } | |
bdf4c48a | 1117 | |
43761473 PM |
1118 | /* create the non-arg portion of the arg record */ |
1119 | len_tmp = 0; | |
1120 | if (require_data || (iter > 0) || | |
1121 | ((len_abuf + sizeof(abuf)) > len_rem)) { | |
1122 | if (iter == 0) { | |
1123 | len_tmp += snprintf(&abuf[len_tmp], | |
1124 | sizeof(abuf) - len_tmp, | |
1125 | " a%d_len=%lu", | |
1126 | arg, len_full); | |
1127 | } | |
1128 | len_tmp += snprintf(&abuf[len_tmp], | |
1129 | sizeof(abuf) - len_tmp, | |
1130 | " a%d[%d]=", arg, iter++); | |
1131 | } else | |
1132 | len_tmp += snprintf(&abuf[len_tmp], | |
1133 | sizeof(abuf) - len_tmp, | |
1134 | " a%d=", arg); | |
1135 | WARN_ON(len_tmp >= sizeof(abuf)); | |
1136 | abuf[sizeof(abuf) - 1] = '\0'; | |
1137 | ||
1138 | /* log the arg in the audit record */ | |
1139 | audit_log_format(*ab, "%s", abuf); | |
1140 | len_rem -= len_tmp; | |
1141 | len_tmp = len_buf; | |
1142 | if (encode) { | |
1143 | if (len_abuf > len_rem) | |
1144 | len_tmp = len_rem / 2; /* encoding */ | |
1145 | audit_log_n_hex(*ab, buf, len_tmp); | |
1146 | len_rem -= len_tmp * 2; | |
1147 | len_abuf -= len_tmp * 2; | |
1148 | } else { | |
1149 | if (len_abuf > len_rem) | |
1150 | len_tmp = len_rem - 2; /* quotes */ | |
1151 | audit_log_n_string(*ab, buf, len_tmp); | |
1152 | len_rem -= len_tmp + 2; | |
1153 | /* don't subtract the "2" because we still need | |
1154 | * to add quotes to the remaining string */ | |
1155 | len_abuf -= len_tmp; | |
1156 | } | |
1157 | len_buf -= len_tmp; | |
1158 | buf += len_tmp; | |
1159 | } | |
bdf4c48a | 1160 | |
43761473 PM |
1161 | /* ready to move to the next argument? */ |
1162 | if ((len_buf == 0) && !require_data) { | |
1163 | arg++; | |
1164 | iter = 0; | |
1165 | len_full = 0; | |
1166 | require_data = true; | |
1167 | encode = false; | |
1168 | } | |
1169 | } while (arg < context->execve.argc); | |
de6bbd1d | 1170 | |
43761473 | 1171 | /* NOTE: the caller handles the final audit_log_end() call */ |
de6bbd1d | 1172 | |
43761473 PM |
1173 | out: |
1174 | kfree(buf_head); | |
bdf4c48a PZ |
1175 | } |
1176 | ||
a33e6751 | 1177 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1178 | { |
1179 | struct audit_buffer *ab; | |
1180 | int i; | |
1181 | ||
1182 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1183 | if (!ab) | |
1184 | return; | |
1185 | ||
1186 | switch (context->type) { | |
1187 | case AUDIT_SOCKETCALL: { | |
1188 | int nargs = context->socketcall.nargs; | |
1189 | audit_log_format(ab, "nargs=%d", nargs); | |
1190 | for (i = 0; i < nargs; i++) | |
1191 | audit_log_format(ab, " a%d=%lx", i, | |
1192 | context->socketcall.args[i]); | |
1193 | break; } | |
a33e6751 AV |
1194 | case AUDIT_IPC: { |
1195 | u32 osid = context->ipc.osid; | |
1196 | ||
2570ebbd | 1197 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1198 | from_kuid(&init_user_ns, context->ipc.uid), |
1199 | from_kgid(&init_user_ns, context->ipc.gid), | |
1200 | context->ipc.mode); | |
a33e6751 AV |
1201 | if (osid) { |
1202 | char *ctx = NULL; | |
1203 | u32 len; | |
1204 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1205 | audit_log_format(ab, " osid=%u", osid); | |
1206 | *call_panic = 1; | |
1207 | } else { | |
1208 | audit_log_format(ab, " obj=%s", ctx); | |
1209 | security_release_secctx(ctx, len); | |
1210 | } | |
1211 | } | |
e816f370 AV |
1212 | if (context->ipc.has_perm) { |
1213 | audit_log_end(ab); | |
1214 | ab = audit_log_start(context, GFP_KERNEL, | |
1215 | AUDIT_IPC_SET_PERM); | |
0644ec0c KC |
1216 | if (unlikely(!ab)) |
1217 | return; | |
e816f370 | 1218 | audit_log_format(ab, |
2570ebbd | 1219 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1220 | context->ipc.qbytes, |
1221 | context->ipc.perm_uid, | |
1222 | context->ipc.perm_gid, | |
1223 | context->ipc.perm_mode); | |
e816f370 | 1224 | } |
a33e6751 | 1225 | break; } |
fe8e52b9 | 1226 | case AUDIT_MQ_OPEN: |
564f6993 | 1227 | audit_log_format(ab, |
df0a4283 | 1228 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1229 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1230 | context->mq_open.oflag, context->mq_open.mode, | |
1231 | context->mq_open.attr.mq_flags, | |
1232 | context->mq_open.attr.mq_maxmsg, | |
1233 | context->mq_open.attr.mq_msgsize, | |
1234 | context->mq_open.attr.mq_curmsgs); | |
fe8e52b9 PM |
1235 | break; |
1236 | case AUDIT_MQ_SENDRECV: | |
c32c8af4 AV |
1237 | audit_log_format(ab, |
1238 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
b9047726 | 1239 | "abs_timeout_sec=%lld abs_timeout_nsec=%ld", |
c32c8af4 AV |
1240 | context->mq_sendrecv.mqdes, |
1241 | context->mq_sendrecv.msg_len, | |
1242 | context->mq_sendrecv.msg_prio, | |
b9047726 | 1243 | (long long) context->mq_sendrecv.abs_timeout.tv_sec, |
c32c8af4 | 1244 | context->mq_sendrecv.abs_timeout.tv_nsec); |
fe8e52b9 PM |
1245 | break; |
1246 | case AUDIT_MQ_NOTIFY: | |
20114f71 AV |
1247 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", |
1248 | context->mq_notify.mqdes, | |
1249 | context->mq_notify.sigev_signo); | |
fe8e52b9 | 1250 | break; |
7392906e AV |
1251 | case AUDIT_MQ_GETSETATTR: { |
1252 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1253 | audit_log_format(ab, | |
1254 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1255 | "mq_curmsgs=%ld ", | |
1256 | context->mq_getsetattr.mqdes, | |
1257 | attr->mq_flags, attr->mq_maxmsg, | |
1258 | attr->mq_msgsize, attr->mq_curmsgs); | |
1259 | break; } | |
fe8e52b9 | 1260 | case AUDIT_CAPSET: |
57f71a0a AV |
1261 | audit_log_format(ab, "pid=%d", context->capset.pid); |
1262 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1263 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1264 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
7786f6b6 | 1265 | audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient); |
fe8e52b9 PM |
1266 | break; |
1267 | case AUDIT_MMAP: | |
120a795d AV |
1268 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, |
1269 | context->mmap.flags); | |
fe8e52b9 PM |
1270 | break; |
1271 | case AUDIT_EXECVE: | |
d9cfea91 | 1272 | audit_log_execve_info(context, &ab); |
fe8e52b9 | 1273 | break; |
ca86cad7 RGB |
1274 | case AUDIT_KERN_MODULE: |
1275 | audit_log_format(ab, "name="); | |
b305f7ed YW |
1276 | if (context->module.name) { |
1277 | audit_log_untrustedstring(ab, context->module.name); | |
1278 | kfree(context->module.name); | |
1279 | } else | |
1280 | audit_log_format(ab, "(null)"); | |
1281 | ||
ca86cad7 | 1282 | break; |
f3298dc4 AV |
1283 | } |
1284 | audit_log_end(ab); | |
1285 | } | |
1286 | ||
3f1c8250 WR |
1287 | static inline int audit_proctitle_rtrim(char *proctitle, int len) |
1288 | { | |
1289 | char *end = proctitle + len - 1; | |
1290 | while (end > proctitle && !isprint(*end)) | |
1291 | end--; | |
1292 | ||
1293 | /* catch the case where proctitle is only 1 non-print character */ | |
1294 | len = end - proctitle + 1; | |
1295 | len -= isprint(proctitle[len-1]) == 0; | |
1296 | return len; | |
1297 | } | |
1298 | ||
1299 | static void audit_log_proctitle(struct task_struct *tsk, | |
1300 | struct audit_context *context) | |
1301 | { | |
1302 | int res; | |
1303 | char *buf; | |
1304 | char *msg = "(null)"; | |
1305 | int len = strlen(msg); | |
1306 | struct audit_buffer *ab; | |
1307 | ||
1308 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE); | |
1309 | if (!ab) | |
1310 | return; /* audit_panic or being filtered */ | |
1311 | ||
1312 | audit_log_format(ab, "proctitle="); | |
1313 | ||
1314 | /* Not cached */ | |
1315 | if (!context->proctitle.value) { | |
1316 | buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL); | |
1317 | if (!buf) | |
1318 | goto out; | |
1319 | /* Historically called this from procfs naming */ | |
1320 | res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN); | |
1321 | if (res == 0) { | |
1322 | kfree(buf); | |
1323 | goto out; | |
1324 | } | |
1325 | res = audit_proctitle_rtrim(buf, res); | |
1326 | if (res == 0) { | |
1327 | kfree(buf); | |
1328 | goto out; | |
1329 | } | |
1330 | context->proctitle.value = buf; | |
1331 | context->proctitle.len = res; | |
1332 | } | |
1333 | msg = context->proctitle.value; | |
1334 | len = context->proctitle.len; | |
1335 | out: | |
1336 | audit_log_n_untrustedstring(ab, msg, len); | |
1337 | audit_log_end(ab); | |
1338 | } | |
1339 | ||
e495149b | 1340 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1341 | { |
9c7aa6aa | 1342 | int i, call_panic = 0; |
1da177e4 | 1343 | struct audit_buffer *ab; |
7551ced3 | 1344 | struct audit_aux_data *aux; |
5195d8e2 | 1345 | struct audit_names *n; |
1da177e4 | 1346 | |
e495149b | 1347 | /* tsk == current */ |
3f2792ff | 1348 | context->personality = tsk->personality; |
e495149b AV |
1349 | |
1350 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1351 | if (!ab) |
1352 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1353 | audit_log_format(ab, "arch=%x syscall=%d", |
1354 | context->arch, context->major); | |
1da177e4 LT |
1355 | if (context->personality != PER_LINUX) |
1356 | audit_log_format(ab, " per=%lx", context->personality); | |
1357 | if (context->return_valid) | |
9f8dbe9c | 1358 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1359 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1360 | context->return_code); | |
eb84a20e | 1361 | |
1da177e4 | 1362 | audit_log_format(ab, |
e23eb920 PM |
1363 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1364 | context->argv[0], | |
1365 | context->argv[1], | |
1366 | context->argv[2], | |
1367 | context->argv[3], | |
1368 | context->name_count); | |
eb84a20e | 1369 | |
e495149b | 1370 | audit_log_task_info(ab, tsk); |
9d960985 | 1371 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1372 | audit_log_end(ab); |
1da177e4 | 1373 | |
7551ced3 | 1374 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1375 | |
e495149b | 1376 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1377 | if (!ab) |
1378 | continue; /* audit_panic has been called */ | |
1379 | ||
1da177e4 | 1380 | switch (aux->type) { |
20ca73bc | 1381 | |
3fc689e9 EP |
1382 | case AUDIT_BPRM_FCAPS: { |
1383 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1384 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1385 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1386 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1387 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1388 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1389 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1390 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
7786f6b6 RGB |
1391 | audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient); |
1392 | audit_log_cap(ab, "pp", &axs->new_pcap.permitted); | |
1393 | audit_log_cap(ab, "pi", &axs->new_pcap.inheritable); | |
1394 | audit_log_cap(ab, "pe", &axs->new_pcap.effective); | |
1395 | audit_log_cap(ab, "pa", &axs->new_pcap.ambient); | |
3fc689e9 EP |
1396 | break; } |
1397 | ||
1da177e4 LT |
1398 | } |
1399 | audit_log_end(ab); | |
1da177e4 LT |
1400 | } |
1401 | ||
f3298dc4 | 1402 | if (context->type) |
a33e6751 | 1403 | show_special(context, &call_panic); |
f3298dc4 | 1404 | |
157cf649 AV |
1405 | if (context->fds[0] >= 0) { |
1406 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1407 | if (ab) { | |
1408 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1409 | context->fds[0], context->fds[1]); | |
1410 | audit_log_end(ab); | |
1411 | } | |
1412 | } | |
1413 | ||
4f6b434f AV |
1414 | if (context->sockaddr_len) { |
1415 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1416 | if (ab) { | |
1417 | audit_log_format(ab, "saddr="); | |
1418 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1419 | context->sockaddr_len); | |
1420 | audit_log_end(ab); | |
1421 | } | |
1422 | } | |
1423 | ||
e54dc243 AG |
1424 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1425 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1426 | |
1427 | for (i = 0; i < axs->pid_count; i++) | |
1428 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1429 | axs->target_auid[i], |
1430 | axs->target_uid[i], | |
4746ec5b | 1431 | axs->target_sessionid[i], |
c2a7780e EP |
1432 | axs->target_sid[i], |
1433 | axs->target_comm[i])) | |
e54dc243 | 1434 | call_panic = 1; |
a5cb013d AV |
1435 | } |
1436 | ||
e54dc243 AG |
1437 | if (context->target_pid && |
1438 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1439 | context->target_auid, context->target_uid, |
4746ec5b | 1440 | context->target_sessionid, |
c2a7780e | 1441 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1442 | call_panic = 1; |
1443 | ||
44707fdf | 1444 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1445 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1446 | if (ab) { |
0b7a0fdb | 1447 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1448 | audit_log_end(ab); |
1449 | } | |
1450 | } | |
73241ccc | 1451 | |
5195d8e2 | 1452 | i = 0; |
79f6530c JL |
1453 | list_for_each_entry(n, &context->names_list, list) { |
1454 | if (n->hidden) | |
1455 | continue; | |
b24a30a7 | 1456 | audit_log_name(context, n, NULL, i++, &call_panic); |
79f6530c | 1457 | } |
c0641f28 | 1458 | |
3f1c8250 WR |
1459 | audit_log_proctitle(tsk, context); |
1460 | ||
c0641f28 EP |
1461 | /* Send end of event record to help user space know we are finished */ |
1462 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1463 | if (ab) | |
1464 | audit_log_end(ab); | |
9c7aa6aa SG |
1465 | if (call_panic) |
1466 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1467 | } |
1468 | ||
b0dd25a8 | 1469 | /** |
196a5085 | 1470 | * __audit_free - free a per-task audit context |
b0dd25a8 RD |
1471 | * @tsk: task whose audit context block to free |
1472 | * | |
fa84cb93 | 1473 | * Called from copy_process and do_exit |
b0dd25a8 | 1474 | */ |
a4ff8dba | 1475 | void __audit_free(struct task_struct *tsk) |
1da177e4 LT |
1476 | { |
1477 | struct audit_context *context; | |
1478 | ||
4a3eb726 | 1479 | context = audit_take_context(tsk, 0, 0); |
56179a6e | 1480 | if (!context) |
1da177e4 LT |
1481 | return; |
1482 | ||
1483 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1484 | * function (e.g., exit_group), then free context block. |
1485 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1486 | * in the context of the idle thread */ |
e495149b | 1487 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1488 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1489 | audit_log_exit(context, tsk); |
916d7576 AV |
1490 | if (!list_empty(&context->killed_trees)) |
1491 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1492 | |
1493 | audit_free_context(context); | |
1494 | } | |
1495 | ||
b0dd25a8 | 1496 | /** |
196a5085 | 1497 | * __audit_syscall_entry - fill in an audit record at syscall entry |
b0dd25a8 RD |
1498 | * @major: major syscall type (function) |
1499 | * @a1: additional syscall register 1 | |
1500 | * @a2: additional syscall register 2 | |
1501 | * @a3: additional syscall register 3 | |
1502 | * @a4: additional syscall register 4 | |
1503 | * | |
1504 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1505 | * audit context was created when the task was created and the state or |
1506 | * filters demand the audit context be built. If the state from the | |
1507 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1508 | * then the record will be written at syscall exit time (otherwise, it | |
1509 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1510 | * be written). |
1511 | */ | |
b4f0d375 RGB |
1512 | void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2, |
1513 | unsigned long a3, unsigned long a4) | |
1da177e4 | 1514 | { |
cdfb6b34 | 1515 | struct audit_context *context = audit_context(); |
1da177e4 LT |
1516 | enum audit_state state; |
1517 | ||
94d14e3e | 1518 | if (!audit_enabled || !context) |
86a1c34a | 1519 | return; |
1da177e4 | 1520 | |
1da177e4 LT |
1521 | BUG_ON(context->in_syscall || context->name_count); |
1522 | ||
1da177e4 | 1523 | state = context->state; |
5260ecc2 RGB |
1524 | if (state == AUDIT_DISABLED) |
1525 | return; | |
1526 | ||
d51374ad | 1527 | context->dummy = !audit_n_rules; |
0590b933 AV |
1528 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1529 | context->prio = 0; | |
cdfb6b34 | 1530 | if (auditd_test_task(current)) |
5260ecc2 | 1531 | return; |
0590b933 | 1532 | } |
1da177e4 | 1533 | |
5260ecc2 RGB |
1534 | context->arch = syscall_get_arch(); |
1535 | context->major = major; | |
1536 | context->argv[0] = a1; | |
1537 | context->argv[1] = a2; | |
1538 | context->argv[2] = a3; | |
1539 | context->argv[3] = a4; | |
ce625a80 | 1540 | context->serial = 0; |
1da177e4 | 1541 | context->in_syscall = 1; |
0590b933 | 1542 | context->current_state = state; |
419c58f1 | 1543 | context->ppid = 0; |
290e44b7 | 1544 | ktime_get_coarse_real_ts64(&context->ctime); |
1da177e4 LT |
1545 | } |
1546 | ||
b0dd25a8 | 1547 | /** |
196a5085 | 1548 | * __audit_syscall_exit - deallocate audit context after a system call |
42ae610c RD |
1549 | * @success: success value of the syscall |
1550 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1551 | * |
1552 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1553 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1554 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1555 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1556 | * free the names stored from getname(). |
1557 | */ | |
d7e7528b | 1558 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 LT |
1559 | { |
1560 | struct audit_context *context; | |
1561 | ||
d7e7528b EP |
1562 | if (success) |
1563 | success = AUDITSC_SUCCESS; | |
1564 | else | |
1565 | success = AUDITSC_FAILURE; | |
1da177e4 | 1566 | |
cdfb6b34 | 1567 | context = audit_take_context(current, success, return_code); |
56179a6e | 1568 | if (!context) |
97e94c45 | 1569 | return; |
1da177e4 | 1570 | |
0590b933 | 1571 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
cdfb6b34 | 1572 | audit_log_exit(context, current); |
1da177e4 LT |
1573 | |
1574 | context->in_syscall = 0; | |
0590b933 | 1575 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1576 | |
916d7576 AV |
1577 | if (!list_empty(&context->killed_trees)) |
1578 | audit_kill_trees(&context->killed_trees); | |
1579 | ||
c62d773a AV |
1580 | audit_free_names(context); |
1581 | unroll_tree_refs(context, NULL, 0); | |
1582 | audit_free_aux(context); | |
1583 | context->aux = NULL; | |
1584 | context->aux_pids = NULL; | |
1585 | context->target_pid = 0; | |
1586 | context->target_sid = 0; | |
1587 | context->sockaddr_len = 0; | |
1588 | context->type = 0; | |
1589 | context->fds[0] = -1; | |
1590 | if (context->state != AUDIT_RECORD_CONTEXT) { | |
1591 | kfree(context->filterkey); | |
1592 | context->filterkey = NULL; | |
1da177e4 | 1593 | } |
c0b0ae8a | 1594 | audit_set_context(current, context); |
1da177e4 LT |
1595 | } |
1596 | ||
74c3cbe3 AV |
1597 | static inline void handle_one(const struct inode *inode) |
1598 | { | |
74c3cbe3 AV |
1599 | struct audit_context *context; |
1600 | struct audit_tree_refs *p; | |
1601 | struct audit_chunk *chunk; | |
1602 | int count; | |
08991e83 | 1603 | if (likely(!inode->i_fsnotify_marks)) |
74c3cbe3 | 1604 | return; |
cdfb6b34 | 1605 | context = audit_context(); |
74c3cbe3 AV |
1606 | p = context->trees; |
1607 | count = context->tree_count; | |
1608 | rcu_read_lock(); | |
1609 | chunk = audit_tree_lookup(inode); | |
1610 | rcu_read_unlock(); | |
1611 | if (!chunk) | |
1612 | return; | |
1613 | if (likely(put_tree_ref(context, chunk))) | |
1614 | return; | |
1615 | if (unlikely(!grow_tree_refs(context))) { | |
f952d10f | 1616 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1617 | audit_set_auditable(context); |
1618 | audit_put_chunk(chunk); | |
1619 | unroll_tree_refs(context, p, count); | |
1620 | return; | |
1621 | } | |
1622 | put_tree_ref(context, chunk); | |
74c3cbe3 AV |
1623 | } |
1624 | ||
1625 | static void handle_path(const struct dentry *dentry) | |
1626 | { | |
74c3cbe3 AV |
1627 | struct audit_context *context; |
1628 | struct audit_tree_refs *p; | |
1629 | const struct dentry *d, *parent; | |
1630 | struct audit_chunk *drop; | |
1631 | unsigned long seq; | |
1632 | int count; | |
1633 | ||
cdfb6b34 | 1634 | context = audit_context(); |
74c3cbe3 AV |
1635 | p = context->trees; |
1636 | count = context->tree_count; | |
1637 | retry: | |
1638 | drop = NULL; | |
1639 | d = dentry; | |
1640 | rcu_read_lock(); | |
1641 | seq = read_seqbegin(&rename_lock); | |
1642 | for(;;) { | |
3b362157 | 1643 | struct inode *inode = d_backing_inode(d); |
08991e83 | 1644 | if (inode && unlikely(inode->i_fsnotify_marks)) { |
74c3cbe3 AV |
1645 | struct audit_chunk *chunk; |
1646 | chunk = audit_tree_lookup(inode); | |
1647 | if (chunk) { | |
1648 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1649 | drop = chunk; | |
1650 | break; | |
1651 | } | |
1652 | } | |
1653 | } | |
1654 | parent = d->d_parent; | |
1655 | if (parent == d) | |
1656 | break; | |
1657 | d = parent; | |
1658 | } | |
1659 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1660 | rcu_read_unlock(); | |
1661 | if (!drop) { | |
1662 | /* just a race with rename */ | |
1663 | unroll_tree_refs(context, p, count); | |
1664 | goto retry; | |
1665 | } | |
1666 | audit_put_chunk(drop); | |
1667 | if (grow_tree_refs(context)) { | |
1668 | /* OK, got more space */ | |
1669 | unroll_tree_refs(context, p, count); | |
1670 | goto retry; | |
1671 | } | |
1672 | /* too bad */ | |
f952d10f | 1673 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1674 | unroll_tree_refs(context, p, count); |
1675 | audit_set_auditable(context); | |
1676 | return; | |
1677 | } | |
1678 | rcu_read_unlock(); | |
74c3cbe3 AV |
1679 | } |
1680 | ||
78e2e802 JL |
1681 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1682 | unsigned char type) | |
5195d8e2 EP |
1683 | { |
1684 | struct audit_names *aname; | |
1685 | ||
1686 | if (context->name_count < AUDIT_NAMES) { | |
1687 | aname = &context->preallocated_names[context->name_count]; | |
1688 | memset(aname, 0, sizeof(*aname)); | |
1689 | } else { | |
1690 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1691 | if (!aname) | |
1692 | return NULL; | |
1693 | aname->should_free = true; | |
1694 | } | |
1695 | ||
84cb777e | 1696 | aname->ino = AUDIT_INO_UNSET; |
78e2e802 | 1697 | aname->type = type; |
5195d8e2 EP |
1698 | list_add_tail(&aname->list, &context->names_list); |
1699 | ||
1700 | context->name_count++; | |
5195d8e2 EP |
1701 | return aname; |
1702 | } | |
1703 | ||
7ac86265 | 1704 | /** |
196a5085 | 1705 | * __audit_reusename - fill out filename with info from existing entry |
7ac86265 JL |
1706 | * @uptr: userland ptr to pathname |
1707 | * | |
1708 | * Search the audit_names list for the current audit context. If there is an | |
1709 | * existing entry with a matching "uptr" then return the filename | |
1710 | * associated with that audit_name. If not, return NULL. | |
1711 | */ | |
1712 | struct filename * | |
1713 | __audit_reusename(const __user char *uptr) | |
1714 | { | |
cdfb6b34 | 1715 | struct audit_context *context = audit_context(); |
7ac86265 JL |
1716 | struct audit_names *n; |
1717 | ||
1718 | list_for_each_entry(n, &context->names_list, list) { | |
1719 | if (!n->name) | |
1720 | continue; | |
55422d0b PM |
1721 | if (n->name->uptr == uptr) { |
1722 | n->name->refcnt++; | |
7ac86265 | 1723 | return n->name; |
55422d0b | 1724 | } |
7ac86265 JL |
1725 | } |
1726 | return NULL; | |
1727 | } | |
1728 | ||
b0dd25a8 | 1729 | /** |
196a5085 | 1730 | * __audit_getname - add a name to the list |
b0dd25a8 RD |
1731 | * @name: name to add |
1732 | * | |
1733 | * Add a name to the list of audit names for this context. | |
1734 | * Called from fs/namei.c:getname(). | |
1735 | */ | |
91a27b2a | 1736 | void __audit_getname(struct filename *name) |
1da177e4 | 1737 | { |
cdfb6b34 | 1738 | struct audit_context *context = audit_context(); |
5195d8e2 | 1739 | struct audit_names *n; |
1da177e4 | 1740 | |
55422d0b | 1741 | if (!context->in_syscall) |
1da177e4 | 1742 | return; |
91a27b2a | 1743 | |
78e2e802 | 1744 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
1745 | if (!n) |
1746 | return; | |
1747 | ||
1748 | n->name = name; | |
1749 | n->name_len = AUDIT_NAME_FULL; | |
adb5c247 | 1750 | name->aname = n; |
55422d0b | 1751 | name->refcnt++; |
5195d8e2 | 1752 | |
f7ad3c6b MS |
1753 | if (!context->pwd.dentry) |
1754 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
1755 | } |
1756 | ||
b0dd25a8 | 1757 | /** |
bfcec708 | 1758 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 1759 | * @name: name being audited |
481968f4 | 1760 | * @dentry: dentry being audited |
79f6530c | 1761 | * @flags: attributes for this particular entry |
b0dd25a8 | 1762 | */ |
adb5c247 | 1763 | void __audit_inode(struct filename *name, const struct dentry *dentry, |
79f6530c | 1764 | unsigned int flags) |
1da177e4 | 1765 | { |
cdfb6b34 | 1766 | struct audit_context *context = audit_context(); |
d6335d77 | 1767 | struct inode *inode = d_backing_inode(dentry); |
5195d8e2 | 1768 | struct audit_names *n; |
79f6530c | 1769 | bool parent = flags & AUDIT_INODE_PARENT; |
1da177e4 LT |
1770 | |
1771 | if (!context->in_syscall) | |
1772 | return; | |
5195d8e2 | 1773 | |
9cec9d68 JL |
1774 | if (!name) |
1775 | goto out_alloc; | |
1776 | ||
adb5c247 JL |
1777 | /* |
1778 | * If we have a pointer to an audit_names entry already, then we can | |
1779 | * just use it directly if the type is correct. | |
1780 | */ | |
1781 | n = name->aname; | |
1782 | if (n) { | |
1783 | if (parent) { | |
1784 | if (n->type == AUDIT_TYPE_PARENT || | |
1785 | n->type == AUDIT_TYPE_UNKNOWN) | |
1786 | goto out; | |
1787 | } else { | |
1788 | if (n->type != AUDIT_TYPE_PARENT) | |
1789 | goto out; | |
1790 | } | |
1791 | } | |
1792 | ||
5195d8e2 | 1793 | list_for_each_entry_reverse(n, &context->names_list, list) { |
57c59f58 PM |
1794 | if (n->ino) { |
1795 | /* valid inode number, use that for the comparison */ | |
1796 | if (n->ino != inode->i_ino || | |
1797 | n->dev != inode->i_sb->s_dev) | |
1798 | continue; | |
1799 | } else if (n->name) { | |
1800 | /* inode number has not been set, check the name */ | |
1801 | if (strcmp(n->name->name, name->name)) | |
1802 | continue; | |
1803 | } else | |
1804 | /* no inode and no name (?!) ... this is odd ... */ | |
bfcec708 JL |
1805 | continue; |
1806 | ||
1807 | /* match the correct record type */ | |
1808 | if (parent) { | |
1809 | if (n->type == AUDIT_TYPE_PARENT || | |
1810 | n->type == AUDIT_TYPE_UNKNOWN) | |
1811 | goto out; | |
1812 | } else { | |
1813 | if (n->type != AUDIT_TYPE_PARENT) | |
1814 | goto out; | |
1815 | } | |
1da177e4 | 1816 | } |
5195d8e2 | 1817 | |
9cec9d68 | 1818 | out_alloc: |
4a928436 PM |
1819 | /* unable to find an entry with both a matching name and type */ |
1820 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); | |
5195d8e2 EP |
1821 | if (!n) |
1822 | return; | |
fcf22d82 | 1823 | if (name) { |
fd3522fd | 1824 | n->name = name; |
55422d0b | 1825 | name->refcnt++; |
fcf22d82 | 1826 | } |
4a928436 | 1827 | |
5195d8e2 | 1828 | out: |
bfcec708 | 1829 | if (parent) { |
91a27b2a | 1830 | n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec708 | 1831 | n->type = AUDIT_TYPE_PARENT; |
79f6530c JL |
1832 | if (flags & AUDIT_INODE_HIDDEN) |
1833 | n->hidden = true; | |
bfcec708 JL |
1834 | } else { |
1835 | n->name_len = AUDIT_NAME_FULL; | |
1836 | n->type = AUDIT_TYPE_NORMAL; | |
1837 | } | |
74c3cbe3 | 1838 | handle_path(dentry); |
5195d8e2 | 1839 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
1840 | } |
1841 | ||
9f45f5bf AV |
1842 | void __audit_file(const struct file *file) |
1843 | { | |
1844 | __audit_inode(NULL, file->f_path.dentry, 0); | |
1845 | } | |
1846 | ||
73241ccc | 1847 | /** |
c43a25ab | 1848 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 1849 | * @parent: inode of dentry parent |
c43a25ab | 1850 | * @dentry: dentry being audited |
4fa6b5ec | 1851 | * @type: AUDIT_TYPE_* value that we're looking for |
73241ccc AG |
1852 | * |
1853 | * For syscalls that create or remove filesystem objects, audit_inode | |
1854 | * can only collect information for the filesystem object's parent. | |
1855 | * This call updates the audit context with the child's information. | |
1856 | * Syscalls that create a new filesystem object must be hooked after | |
1857 | * the object is created. Syscalls that remove a filesystem object | |
1858 | * must be hooked prior, in order to capture the target inode during | |
1859 | * unsuccessful attempts. | |
1860 | */ | |
d6335d77 | 1861 | void __audit_inode_child(struct inode *parent, |
4fa6b5ec JL |
1862 | const struct dentry *dentry, |
1863 | const unsigned char type) | |
73241ccc | 1864 | { |
cdfb6b34 | 1865 | struct audit_context *context = audit_context(); |
d6335d77 | 1866 | struct inode *inode = d_backing_inode(dentry); |
cccc6bba | 1867 | const char *dname = dentry->d_name.name; |
4fa6b5ec | 1868 | struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
42d5e376 RGB |
1869 | struct audit_entry *e; |
1870 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
1871 | int i; | |
73241ccc AG |
1872 | |
1873 | if (!context->in_syscall) | |
1874 | return; | |
1875 | ||
42d5e376 RGB |
1876 | rcu_read_lock(); |
1877 | if (!list_empty(list)) { | |
1878 | list_for_each_entry_rcu(e, list, list) { | |
1879 | for (i = 0; i < e->rule.field_count; i++) { | |
1880 | struct audit_field *f = &e->rule.fields[i]; | |
1881 | ||
1882 | if (f->type == AUDIT_FSTYPE) { | |
1883 | if (audit_comparator(parent->i_sb->s_magic, | |
1884 | f->op, f->val)) { | |
1885 | if (e->rule.action == AUDIT_NEVER) { | |
1886 | rcu_read_unlock(); | |
1887 | return; | |
1888 | } | |
1889 | } | |
1890 | } | |
1891 | } | |
1892 | } | |
1893 | } | |
1894 | rcu_read_unlock(); | |
1895 | ||
74c3cbe3 AV |
1896 | if (inode) |
1897 | handle_one(inode); | |
73241ccc | 1898 | |
4fa6b5ec | 1899 | /* look for a parent entry first */ |
5195d8e2 | 1900 | list_for_each_entry(n, &context->names_list, list) { |
57c59f58 PM |
1901 | if (!n->name || |
1902 | (n->type != AUDIT_TYPE_PARENT && | |
1903 | n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
1904 | continue; |
1905 | ||
57c59f58 PM |
1906 | if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev && |
1907 | !audit_compare_dname_path(dname, | |
1908 | n->name->name, n->name_len)) { | |
1909 | if (n->type == AUDIT_TYPE_UNKNOWN) | |
1910 | n->type = AUDIT_TYPE_PARENT; | |
4fa6b5ec JL |
1911 | found_parent = n; |
1912 | break; | |
f368c07d | 1913 | } |
5712e88f | 1914 | } |
73241ccc | 1915 | |
4fa6b5ec | 1916 | /* is there a matching child entry? */ |
5195d8e2 | 1917 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec | 1918 | /* can only match entries that have a name */ |
57c59f58 PM |
1919 | if (!n->name || |
1920 | (n->type != type && n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
1921 | continue; |
1922 | ||
91a27b2a JL |
1923 | if (!strcmp(dname, n->name->name) || |
1924 | !audit_compare_dname_path(dname, n->name->name, | |
4fa6b5ec JL |
1925 | found_parent ? |
1926 | found_parent->name_len : | |
e3d6b07b | 1927 | AUDIT_NAME_FULL)) { |
57c59f58 PM |
1928 | if (n->type == AUDIT_TYPE_UNKNOWN) |
1929 | n->type = type; | |
4fa6b5ec JL |
1930 | found_child = n; |
1931 | break; | |
5712e88f | 1932 | } |
ac9910ce | 1933 | } |
5712e88f | 1934 | |
5712e88f | 1935 | if (!found_parent) { |
4fa6b5ec JL |
1936 | /* create a new, "anonymous" parent record */ |
1937 | n = audit_alloc_name(context, AUDIT_TYPE_PARENT); | |
5195d8e2 | 1938 | if (!n) |
ac9910ce | 1939 | return; |
5195d8e2 | 1940 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 1941 | } |
5712e88f AG |
1942 | |
1943 | if (!found_child) { | |
4fa6b5ec JL |
1944 | found_child = audit_alloc_name(context, type); |
1945 | if (!found_child) | |
5712e88f | 1946 | return; |
5712e88f AG |
1947 | |
1948 | /* Re-use the name belonging to the slot for a matching parent | |
1949 | * directory. All names for this context are relinquished in | |
1950 | * audit_free_names() */ | |
1951 | if (found_parent) { | |
4fa6b5ec JL |
1952 | found_child->name = found_parent->name; |
1953 | found_child->name_len = AUDIT_NAME_FULL; | |
55422d0b | 1954 | found_child->name->refcnt++; |
5712e88f | 1955 | } |
5712e88f | 1956 | } |
57c59f58 | 1957 | |
4fa6b5ec JL |
1958 | if (inode) |
1959 | audit_copy_inode(found_child, dentry, inode); | |
1960 | else | |
84cb777e | 1961 | found_child->ino = AUDIT_INO_UNSET; |
3e2efce0 | 1962 | } |
50e437d5 | 1963 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 1964 | |
b0dd25a8 RD |
1965 | /** |
1966 | * auditsc_get_stamp - get local copies of audit_context values | |
1967 | * @ctx: audit_context for the task | |
2115bb25 | 1968 | * @t: timespec64 to store time recorded in the audit_context |
b0dd25a8 RD |
1969 | * @serial: serial value that is recorded in the audit_context |
1970 | * | |
1971 | * Also sets the context as auditable. | |
1972 | */ | |
48887e63 | 1973 | int auditsc_get_stamp(struct audit_context *ctx, |
2115bb25 | 1974 | struct timespec64 *t, unsigned int *serial) |
1da177e4 | 1975 | { |
48887e63 AV |
1976 | if (!ctx->in_syscall) |
1977 | return 0; | |
ce625a80 DW |
1978 | if (!ctx->serial) |
1979 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1980 | t->tv_sec = ctx->ctime.tv_sec; |
1981 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1982 | *serial = ctx->serial; | |
0590b933 AV |
1983 | if (!ctx->prio) { |
1984 | ctx->prio = 1; | |
1985 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
1986 | } | |
48887e63 | 1987 | return 1; |
1da177e4 LT |
1988 | } |
1989 | ||
4746ec5b EP |
1990 | /* global counter which is incremented every time something logs in */ |
1991 | static atomic_t session_id = ATOMIC_INIT(0); | |
1992 | ||
da0a6104 EP |
1993 | static int audit_set_loginuid_perm(kuid_t loginuid) |
1994 | { | |
da0a6104 EP |
1995 | /* if we are unset, we don't need privs */ |
1996 | if (!audit_loginuid_set(current)) | |
1997 | return 0; | |
21b85c31 EP |
1998 | /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/ |
1999 | if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE)) | |
2000 | return -EPERM; | |
83fa6bbe EP |
2001 | /* it is set, you need permission */ |
2002 | if (!capable(CAP_AUDIT_CONTROL)) | |
2003 | return -EPERM; | |
d040e5af EP |
2004 | /* reject if this is not an unset and we don't allow that */ |
2005 | if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid)) | |
2006 | return -EPERM; | |
83fa6bbe | 2007 | return 0; |
da0a6104 EP |
2008 | } |
2009 | ||
2010 | static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, | |
2011 | unsigned int oldsessionid, unsigned int sessionid, | |
2012 | int rc) | |
2013 | { | |
2014 | struct audit_buffer *ab; | |
5ee9a75c | 2015 | uid_t uid, oldloginuid, loginuid; |
db0a6fb5 | 2016 | struct tty_struct *tty; |
da0a6104 | 2017 | |
c2412d91 G |
2018 | if (!audit_enabled) |
2019 | return; | |
2020 | ||
76a658c2 RGB |
2021 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
2022 | if (!ab) | |
2023 | return; | |
2024 | ||
da0a6104 | 2025 | uid = from_kuid(&init_user_ns, task_uid(current)); |
5ee9a75c RGB |
2026 | oldloginuid = from_kuid(&init_user_ns, koldloginuid); |
2027 | loginuid = from_kuid(&init_user_ns, kloginuid), | |
db0a6fb5 | 2028 | tty = audit_get_tty(current); |
da0a6104 | 2029 | |
fa2bea2f | 2030 | audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid); |
ddfad8af | 2031 | audit_log_task_context(ab); |
db0a6fb5 RGB |
2032 | audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d", |
2033 | oldloginuid, loginuid, tty ? tty_name(tty) : "(none)", | |
2034 | oldsessionid, sessionid, !rc); | |
2035 | audit_put_tty(tty); | |
da0a6104 EP |
2036 | audit_log_end(ab); |
2037 | } | |
2038 | ||
b0dd25a8 | 2039 | /** |
0a300be6 | 2040 | * audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a8 RD |
2041 | * @loginuid: loginuid value |
2042 | * | |
2043 | * Returns 0. | |
2044 | * | |
2045 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2046 | */ | |
e1760bd5 | 2047 | int audit_set_loginuid(kuid_t loginuid) |
1da177e4 | 2048 | { |
0a300be6 | 2049 | struct task_struct *task = current; |
f0b75216 | 2050 | unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET; |
9175c9d2 | 2051 | kuid_t oldloginuid; |
da0a6104 | 2052 | int rc; |
41757106 | 2053 | |
da0a6104 EP |
2054 | oldloginuid = audit_get_loginuid(current); |
2055 | oldsessionid = audit_get_sessionid(current); | |
2056 | ||
2057 | rc = audit_set_loginuid_perm(loginuid); | |
2058 | if (rc) | |
2059 | goto out; | |
633b4545 | 2060 | |
81407c84 | 2061 | /* are we setting or clearing? */ |
833fc48d | 2062 | if (uid_valid(loginuid)) { |
4440e854 | 2063 | sessionid = (unsigned int)atomic_inc_return(&session_id); |
f0b75216 | 2064 | if (unlikely(sessionid == AUDIT_SID_UNSET)) |
833fc48d RGB |
2065 | sessionid = (unsigned int)atomic_inc_return(&session_id); |
2066 | } | |
bfef93a5 | 2067 | |
4746ec5b | 2068 | task->sessionid = sessionid; |
bfef93a5 | 2069 | task->loginuid = loginuid; |
da0a6104 EP |
2070 | out: |
2071 | audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); | |
2072 | return rc; | |
1da177e4 LT |
2073 | } |
2074 | ||
20ca73bc GW |
2075 | /** |
2076 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2077 | * @oflag: open flag | |
2078 | * @mode: mode bits | |
6b962559 | 2079 | * @attr: queue attributes |
20ca73bc | 2080 | * |
20ca73bc | 2081 | */ |
df0a4283 | 2082 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2083 | { |
cdfb6b34 | 2084 | struct audit_context *context = audit_context(); |
20ca73bc | 2085 | |
564f6993 AV |
2086 | if (attr) |
2087 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2088 | else | |
2089 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2090 | |
564f6993 AV |
2091 | context->mq_open.oflag = oflag; |
2092 | context->mq_open.mode = mode; | |
20ca73bc | 2093 | |
564f6993 | 2094 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2095 | } |
2096 | ||
2097 | /** | |
c32c8af4 | 2098 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2099 | * @mqdes: MQ descriptor |
2100 | * @msg_len: Message length | |
2101 | * @msg_prio: Message priority | |
c32c8af4 | 2102 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2103 | * |
20ca73bc | 2104 | */ |
c32c8af4 | 2105 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
b9047726 | 2106 | const struct timespec64 *abs_timeout) |
20ca73bc | 2107 | { |
cdfb6b34 | 2108 | struct audit_context *context = audit_context(); |
b9047726 | 2109 | struct timespec64 *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2110 | |
c32c8af4 | 2111 | if (abs_timeout) |
b9047726 | 2112 | memcpy(p, abs_timeout, sizeof(*p)); |
c32c8af4 | 2113 | else |
b9047726 | 2114 | memset(p, 0, sizeof(*p)); |
20ca73bc | 2115 | |
c32c8af4 AV |
2116 | context->mq_sendrecv.mqdes = mqdes; |
2117 | context->mq_sendrecv.msg_len = msg_len; | |
2118 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2119 | |
c32c8af4 | 2120 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2121 | } |
2122 | ||
2123 | /** | |
2124 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2125 | * @mqdes: MQ descriptor | |
6b962559 | 2126 | * @notification: Notification event |
20ca73bc | 2127 | * |
20ca73bc GW |
2128 | */ |
2129 | ||
20114f71 | 2130 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2131 | { |
cdfb6b34 | 2132 | struct audit_context *context = audit_context(); |
20ca73bc | 2133 | |
20114f71 AV |
2134 | if (notification) |
2135 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2136 | else | |
2137 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2138 | |
20114f71 AV |
2139 | context->mq_notify.mqdes = mqdes; |
2140 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2141 | } |
2142 | ||
2143 | /** | |
2144 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2145 | * @mqdes: MQ descriptor | |
2146 | * @mqstat: MQ flags | |
2147 | * | |
20ca73bc | 2148 | */ |
7392906e | 2149 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2150 | { |
cdfb6b34 | 2151 | struct audit_context *context = audit_context(); |
7392906e AV |
2152 | context->mq_getsetattr.mqdes = mqdes; |
2153 | context->mq_getsetattr.mqstat = *mqstat; | |
2154 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2155 | } |
2156 | ||
b0dd25a8 | 2157 | /** |
196a5085 | 2158 | * __audit_ipc_obj - record audit data for ipc object |
073115d6 SG |
2159 | * @ipcp: ipc permissions |
2160 | * | |
073115d6 | 2161 | */ |
a33e6751 | 2162 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2163 | { |
cdfb6b34 | 2164 | struct audit_context *context = audit_context(); |
a33e6751 AV |
2165 | context->ipc.uid = ipcp->uid; |
2166 | context->ipc.gid = ipcp->gid; | |
2167 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2168 | context->ipc.has_perm = 0; |
a33e6751 AV |
2169 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2170 | context->type = AUDIT_IPC; | |
073115d6 SG |
2171 | } |
2172 | ||
2173 | /** | |
196a5085 | 2174 | * __audit_ipc_set_perm - record audit data for new ipc permissions |
b0dd25a8 RD |
2175 | * @qbytes: msgq bytes |
2176 | * @uid: msgq user id | |
2177 | * @gid: msgq group id | |
2178 | * @mode: msgq mode (permissions) | |
2179 | * | |
e816f370 | 2180 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2181 | */ |
2570ebbd | 2182 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2183 | { |
cdfb6b34 | 2184 | struct audit_context *context = audit_context(); |
1da177e4 | 2185 | |
e816f370 AV |
2186 | context->ipc.qbytes = qbytes; |
2187 | context->ipc.perm_uid = uid; | |
2188 | context->ipc.perm_gid = gid; | |
2189 | context->ipc.perm_mode = mode; | |
2190 | context->ipc.has_perm = 1; | |
1da177e4 | 2191 | } |
c2f0c7c3 | 2192 | |
d9cfea91 | 2193 | void __audit_bprm(struct linux_binprm *bprm) |
473ae30b | 2194 | { |
cdfb6b34 | 2195 | struct audit_context *context = audit_context(); |
473ae30b | 2196 | |
d9cfea91 RGB |
2197 | context->type = AUDIT_EXECVE; |
2198 | context->execve.argc = bprm->argc; | |
473ae30b AV |
2199 | } |
2200 | ||
2201 | ||
b0dd25a8 | 2202 | /** |
196a5085 | 2203 | * __audit_socketcall - record audit data for sys_socketcall |
2950fa9d | 2204 | * @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a8 RD |
2205 | * @args: args array |
2206 | * | |
b0dd25a8 | 2207 | */ |
2950fa9d | 2208 | int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2209 | { |
cdfb6b34 | 2210 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2211 | |
2950fa9d CG |
2212 | if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) |
2213 | return -EINVAL; | |
f3298dc4 AV |
2214 | context->type = AUDIT_SOCKETCALL; |
2215 | context->socketcall.nargs = nargs; | |
2216 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
2950fa9d | 2217 | return 0; |
3ec3b2fb DW |
2218 | } |
2219 | ||
db349509 AV |
2220 | /** |
2221 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2222 | * @fd1: the first file descriptor | |
2223 | * @fd2: the second file descriptor | |
2224 | * | |
db349509 | 2225 | */ |
157cf649 | 2226 | void __audit_fd_pair(int fd1, int fd2) |
db349509 | 2227 | { |
cdfb6b34 | 2228 | struct audit_context *context = audit_context(); |
157cf649 AV |
2229 | context->fds[0] = fd1; |
2230 | context->fds[1] = fd2; | |
db349509 AV |
2231 | } |
2232 | ||
b0dd25a8 | 2233 | /** |
196a5085 | 2234 | * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto |
b0dd25a8 RD |
2235 | * @len: data length in user space |
2236 | * @a: data address in kernel space | |
2237 | * | |
2238 | * Returns 0 for success or NULL context or < 0 on error. | |
2239 | */ | |
07c49417 | 2240 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2241 | { |
cdfb6b34 | 2242 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2243 | |
4f6b434f AV |
2244 | if (!context->sockaddr) { |
2245 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2246 | if (!p) | |
2247 | return -ENOMEM; | |
2248 | context->sockaddr = p; | |
2249 | } | |
3ec3b2fb | 2250 | |
4f6b434f AV |
2251 | context->sockaddr_len = len; |
2252 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2253 | return 0; |
2254 | } | |
2255 | ||
a5cb013d AV |
2256 | void __audit_ptrace(struct task_struct *t) |
2257 | { | |
cdfb6b34 | 2258 | struct audit_context *context = audit_context(); |
a5cb013d | 2259 | |
fa2bea2f | 2260 | context->target_pid = task_tgid_nr(t); |
c2a7780e | 2261 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2262 | context->target_uid = task_uid(t); |
4746ec5b | 2263 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2264 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2265 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2266 | } |
2267 | ||
b0dd25a8 RD |
2268 | /** |
2269 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2270 | * @sig: signal value | |
2271 | * @t: task being signaled | |
2272 | * | |
2273 | * If the audit subsystem is being terminated, record the task (pid) | |
2274 | * and uid that is doing that. | |
2275 | */ | |
ab6434a1 | 2276 | int audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2277 | { |
e54dc243 | 2278 | struct audit_aux_data_pids *axp; |
cdfb6b34 | 2279 | struct audit_context *ctx = audit_context(); |
38f80590 | 2280 | kuid_t uid = current_uid(), auid, t_uid = task_uid(t); |
e1396065 | 2281 | |
ab6434a1 PM |
2282 | if (auditd_test_task(t) && |
2283 | (sig == SIGTERM || sig == SIGHUP || | |
2284 | sig == SIGUSR1 || sig == SIGUSR2)) { | |
cdfb6b34 | 2285 | audit_sig_pid = task_tgid_nr(current); |
38f80590 RGB |
2286 | auid = audit_get_loginuid(current); |
2287 | if (uid_valid(auid)) | |
2288 | audit_sig_uid = auid; | |
ab6434a1 PM |
2289 | else |
2290 | audit_sig_uid = uid; | |
cdfb6b34 | 2291 | security_task_getsecid(current, &audit_sig_sid); |
c2f0c7c3 | 2292 | } |
e54dc243 | 2293 | |
ab6434a1 PM |
2294 | if (!audit_signals || audit_dummy_context()) |
2295 | return 0; | |
2296 | ||
e54dc243 AG |
2297 | /* optimize the common case by putting first signal recipient directly |
2298 | * in audit_context */ | |
2299 | if (!ctx->target_pid) { | |
f1dc4867 | 2300 | ctx->target_pid = task_tgid_nr(t); |
c2a7780e | 2301 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2302 | ctx->target_uid = t_uid; |
4746ec5b | 2303 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2304 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2305 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2306 | return 0; |
2307 | } | |
2308 | ||
2309 | axp = (void *)ctx->aux_pids; | |
2310 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2311 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2312 | if (!axp) | |
2313 | return -ENOMEM; | |
2314 | ||
2315 | axp->d.type = AUDIT_OBJ_PID; | |
2316 | axp->d.next = ctx->aux_pids; | |
2317 | ctx->aux_pids = (void *)axp; | |
2318 | } | |
88ae704c | 2319 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 | 2320 | |
f1dc4867 | 2321 | axp->target_pid[axp->pid_count] = task_tgid_nr(t); |
c2a7780e | 2322 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2323 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2324 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2325 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2326 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2327 | axp->pid_count++; |
2328 | ||
2329 | return 0; | |
c2f0c7c3 | 2330 | } |
0a4ff8c2 | 2331 | |
3fc689e9 EP |
2332 | /** |
2333 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2334 | * @bprm: pointer to the bprm being processed |
2335 | * @new: the proposed new credentials | |
2336 | * @old: the old credentials | |
3fc689e9 EP |
2337 | * |
2338 | * Simply check if the proc already has the caps given by the file and if not | |
2339 | * store the priv escalation info for later auditing at the end of the syscall | |
2340 | * | |
3fc689e9 EP |
2341 | * -Eric |
2342 | */ | |
d84f4f99 DH |
2343 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2344 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2345 | { |
2346 | struct audit_aux_data_bprm_fcaps *ax; | |
cdfb6b34 | 2347 | struct audit_context *context = audit_context(); |
3fc689e9 | 2348 | struct cpu_vfs_cap_data vcaps; |
3fc689e9 EP |
2349 | |
2350 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2351 | if (!ax) | |
d84f4f99 | 2352 | return -ENOMEM; |
3fc689e9 EP |
2353 | |
2354 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2355 | ax->d.next = context->aux; | |
2356 | context->aux = (void *)ax; | |
2357 | ||
f4a4a8b1 | 2358 | get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps); |
3fc689e9 EP |
2359 | |
2360 | ax->fcap.permitted = vcaps.permitted; | |
2361 | ax->fcap.inheritable = vcaps.inheritable; | |
2362 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2363 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2364 | ||
d84f4f99 DH |
2365 | ax->old_pcap.permitted = old->cap_permitted; |
2366 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2367 | ax->old_pcap.effective = old->cap_effective; | |
7786f6b6 | 2368 | ax->old_pcap.ambient = old->cap_ambient; |
3fc689e9 | 2369 | |
d84f4f99 DH |
2370 | ax->new_pcap.permitted = new->cap_permitted; |
2371 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2372 | ax->new_pcap.effective = new->cap_effective; | |
7786f6b6 | 2373 | ax->new_pcap.ambient = new->cap_ambient; |
d84f4f99 | 2374 | return 0; |
3fc689e9 EP |
2375 | } |
2376 | ||
e68b75a0 EP |
2377 | /** |
2378 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2379 | * @new: the new credentials |
2380 | * @old: the old (current) credentials | |
e68b75a0 | 2381 | * |
da3dae54 | 2382 | * Record the arguments userspace sent to sys_capset for later printing by the |
e68b75a0 EP |
2383 | * audit system if applicable |
2384 | */ | |
ca24a23e | 2385 | void __audit_log_capset(const struct cred *new, const struct cred *old) |
e68b75a0 | 2386 | { |
cdfb6b34 | 2387 | struct audit_context *context = audit_context(); |
fa2bea2f | 2388 | context->capset.pid = task_tgid_nr(current); |
57f71a0a AV |
2389 | context->capset.cap.effective = new->cap_effective; |
2390 | context->capset.cap.inheritable = new->cap_effective; | |
2391 | context->capset.cap.permitted = new->cap_permitted; | |
7786f6b6 | 2392 | context->capset.cap.ambient = new->cap_ambient; |
57f71a0a | 2393 | context->type = AUDIT_CAPSET; |
e68b75a0 EP |
2394 | } |
2395 | ||
120a795d AV |
2396 | void __audit_mmap_fd(int fd, int flags) |
2397 | { | |
cdfb6b34 | 2398 | struct audit_context *context = audit_context(); |
120a795d AV |
2399 | context->mmap.fd = fd; |
2400 | context->mmap.flags = flags; | |
2401 | context->type = AUDIT_MMAP; | |
2402 | } | |
2403 | ||
ca86cad7 RGB |
2404 | void __audit_log_kern_module(char *name) |
2405 | { | |
cdfb6b34 | 2406 | struct audit_context *context = audit_context(); |
ca86cad7 | 2407 | |
b305f7ed YW |
2408 | context->module.name = kstrdup(name, GFP_KERNEL); |
2409 | if (!context->module.name) | |
2410 | audit_log_lost("out of memory in __audit_log_kern_module"); | |
ca86cad7 RGB |
2411 | context->type = AUDIT_KERN_MODULE; |
2412 | } | |
2413 | ||
de8cd83e SG |
2414 | void __audit_fanotify(unsigned int response) |
2415 | { | |
cdfb6b34 | 2416 | audit_log(audit_context(), GFP_KERNEL, |
de8cd83e SG |
2417 | AUDIT_FANOTIFY, "resp=%u", response); |
2418 | } | |
2419 | ||
7b9205bd | 2420 | static void audit_log_task(struct audit_buffer *ab) |
85e7bac3 | 2421 | { |
cca080d9 EB |
2422 | kuid_t auid, uid; |
2423 | kgid_t gid; | |
85e7bac3 | 2424 | unsigned int sessionid; |
9eab339b | 2425 | char comm[sizeof(current->comm)]; |
85e7bac3 EP |
2426 | |
2427 | auid = audit_get_loginuid(current); | |
2428 | sessionid = audit_get_sessionid(current); | |
2429 | current_uid_gid(&uid, &gid); | |
2430 | ||
2431 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2432 | from_kuid(&init_user_ns, auid), |
2433 | from_kuid(&init_user_ns, uid), | |
2434 | from_kgid(&init_user_ns, gid), | |
2435 | sessionid); | |
85e7bac3 | 2436 | audit_log_task_context(ab); |
fa2bea2f | 2437 | audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); |
9eab339b | 2438 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); |
4766b199 | 2439 | audit_log_d_path_exe(ab, current->mm); |
7b9205bd KC |
2440 | } |
2441 | ||
0a4ff8c2 SG |
2442 | /** |
2443 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2444 | * @signr: signal value |
0a4ff8c2 SG |
2445 | * |
2446 | * If a process ends with a core dump, something fishy is going on and we | |
2447 | * should record the event for investigation. | |
2448 | */ | |
2449 | void audit_core_dumps(long signr) | |
2450 | { | |
2451 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2452 | |
2453 | if (!audit_enabled) | |
2454 | return; | |
2455 | ||
2456 | if (signr == SIGQUIT) /* don't care for those */ | |
2457 | return; | |
2458 | ||
d87de4a8 | 2459 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND); |
0644ec0c KC |
2460 | if (unlikely(!ab)) |
2461 | return; | |
61c0ee87 | 2462 | audit_log_task(ab); |
89670aff | 2463 | audit_log_format(ab, " sig=%ld res=1", signr); |
85e7bac3 EP |
2464 | audit_log_end(ab); |
2465 | } | |
0a4ff8c2 | 2466 | |
326bee02 TH |
2467 | /** |
2468 | * audit_seccomp - record information about a seccomp action | |
2469 | * @syscall: syscall number | |
2470 | * @signr: signal value | |
2471 | * @code: the seccomp action | |
2472 | * | |
2473 | * Record the information associated with a seccomp action. Event filtering for | |
2474 | * seccomp actions that are not to be logged is done in seccomp_log(). | |
2475 | * Therefore, this function forces auditing independent of the audit_enabled | |
2476 | * and dummy context state because seccomp actions should be logged even when | |
2477 | * audit is not in use. | |
2478 | */ | |
2479 | void audit_seccomp(unsigned long syscall, long signr, int code) | |
85e7bac3 EP |
2480 | { |
2481 | struct audit_buffer *ab; | |
2482 | ||
9b8753ff | 2483 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP); |
7b9205bd KC |
2484 | if (unlikely(!ab)) |
2485 | return; | |
2486 | audit_log_task(ab); | |
84db564a | 2487 | audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x", |
efbc0fbf AL |
2488 | signr, syscall_get_arch(), syscall, |
2489 | in_compat_syscall(), KSTK_EIP(current), code); | |
0a4ff8c2 SG |
2490 | audit_log_end(ab); |
2491 | } | |
916d7576 | 2492 | |
ea6eca77 TH |
2493 | void audit_seccomp_actions_logged(const char *names, const char *old_names, |
2494 | int res) | |
2495 | { | |
2496 | struct audit_buffer *ab; | |
2497 | ||
2498 | if (!audit_enabled) | |
2499 | return; | |
2500 | ||
8982a1fb | 2501 | ab = audit_log_start(audit_context(), GFP_KERNEL, |
ea6eca77 TH |
2502 | AUDIT_CONFIG_CHANGE); |
2503 | if (unlikely(!ab)) | |
2504 | return; | |
2505 | ||
2506 | audit_log_format(ab, "op=seccomp-logging"); | |
2507 | audit_log_format(ab, " actions=%s", names); | |
2508 | audit_log_format(ab, " old-actions=%s", old_names); | |
2509 | audit_log_format(ab, " res=%d", res); | |
2510 | audit_log_end(ab); | |
2511 | } | |
2512 | ||
916d7576 AV |
2513 | struct list_head *audit_killed_trees(void) |
2514 | { | |
cdfb6b34 | 2515 | struct audit_context *ctx = audit_context(); |
916d7576 AV |
2516 | if (likely(!ctx || !ctx->in_syscall)) |
2517 | return NULL; | |
2518 | return &ctx->killed_trees; | |
2519 | } |