Commit | Line | Data |
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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 | ||
203 | #ifdef CONFIG_AUDIT_TREE | |
679173b7 EP |
204 | static void audit_set_auditable(struct audit_context *ctx) |
205 | { | |
206 | if (!ctx->prio) { | |
207 | ctx->prio = 1; | |
208 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
209 | } | |
210 | } | |
211 | ||
74c3cbe3 AV |
212 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
213 | { | |
214 | struct audit_tree_refs *p = ctx->trees; | |
215 | int left = ctx->tree_count; | |
216 | if (likely(left)) { | |
217 | p->c[--left] = chunk; | |
218 | ctx->tree_count = left; | |
219 | return 1; | |
220 | } | |
221 | if (!p) | |
222 | return 0; | |
223 | p = p->next; | |
224 | if (p) { | |
225 | p->c[30] = chunk; | |
226 | ctx->trees = p; | |
227 | ctx->tree_count = 30; | |
228 | return 1; | |
229 | } | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static int grow_tree_refs(struct audit_context *ctx) | |
234 | { | |
235 | struct audit_tree_refs *p = ctx->trees; | |
236 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
237 | if (!ctx->trees) { | |
238 | ctx->trees = p; | |
239 | return 0; | |
240 | } | |
241 | if (p) | |
242 | p->next = ctx->trees; | |
243 | else | |
244 | ctx->first_trees = ctx->trees; | |
245 | ctx->tree_count = 31; | |
246 | return 1; | |
247 | } | |
248 | #endif | |
249 | ||
250 | static void unroll_tree_refs(struct audit_context *ctx, | |
251 | struct audit_tree_refs *p, int count) | |
252 | { | |
253 | #ifdef CONFIG_AUDIT_TREE | |
254 | struct audit_tree_refs *q; | |
255 | int n; | |
256 | if (!p) { | |
257 | /* we started with empty chain */ | |
258 | p = ctx->first_trees; | |
259 | count = 31; | |
260 | /* if the very first allocation has failed, nothing to do */ | |
261 | if (!p) | |
262 | return; | |
263 | } | |
264 | n = count; | |
265 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
266 | while (n--) { | |
267 | audit_put_chunk(q->c[n]); | |
268 | q->c[n] = NULL; | |
269 | } | |
270 | } | |
271 | while (n-- > ctx->tree_count) { | |
272 | audit_put_chunk(q->c[n]); | |
273 | q->c[n] = NULL; | |
274 | } | |
275 | ctx->trees = p; | |
276 | ctx->tree_count = count; | |
277 | #endif | |
278 | } | |
279 | ||
280 | static void free_tree_refs(struct audit_context *ctx) | |
281 | { | |
282 | struct audit_tree_refs *p, *q; | |
283 | for (p = ctx->first_trees; p; p = q) { | |
284 | q = p->next; | |
285 | kfree(p); | |
286 | } | |
287 | } | |
288 | ||
289 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
290 | { | |
291 | #ifdef CONFIG_AUDIT_TREE | |
292 | struct audit_tree_refs *p; | |
293 | int n; | |
294 | if (!tree) | |
295 | return 0; | |
296 | /* full ones */ | |
297 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
298 | for (n = 0; n < 31; n++) | |
299 | if (audit_tree_match(p->c[n], tree)) | |
300 | return 1; | |
301 | } | |
302 | /* partial */ | |
303 | if (p) { | |
304 | for (n = ctx->tree_count; n < 31; n++) | |
305 | if (audit_tree_match(p->c[n], tree)) | |
306 | return 1; | |
307 | } | |
308 | #endif | |
309 | return 0; | |
310 | } | |
311 | ||
ca57ec0f EB |
312 | static int audit_compare_uid(kuid_t uid, |
313 | struct audit_names *name, | |
314 | struct audit_field *f, | |
315 | struct audit_context *ctx) | |
b34b0393 EP |
316 | { |
317 | struct audit_names *n; | |
b34b0393 | 318 | int rc; |
ca57ec0f | 319 | |
b34b0393 | 320 | if (name) { |
ca57ec0f | 321 | rc = audit_uid_comparator(uid, f->op, name->uid); |
b34b0393 EP |
322 | if (rc) |
323 | return rc; | |
324 | } | |
ca57ec0f | 325 | |
b34b0393 EP |
326 | if (ctx) { |
327 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f EB |
328 | rc = audit_uid_comparator(uid, f->op, n->uid); |
329 | if (rc) | |
330 | return rc; | |
331 | } | |
332 | } | |
333 | return 0; | |
334 | } | |
b34b0393 | 335 | |
ca57ec0f EB |
336 | static int audit_compare_gid(kgid_t gid, |
337 | struct audit_names *name, | |
338 | struct audit_field *f, | |
339 | struct audit_context *ctx) | |
340 | { | |
341 | struct audit_names *n; | |
342 | int rc; | |
343 | ||
344 | if (name) { | |
345 | rc = audit_gid_comparator(gid, f->op, name->gid); | |
346 | if (rc) | |
347 | return rc; | |
348 | } | |
349 | ||
350 | if (ctx) { | |
351 | list_for_each_entry(n, &ctx->names_list, list) { | |
352 | rc = audit_gid_comparator(gid, f->op, n->gid); | |
b34b0393 EP |
353 | if (rc) |
354 | return rc; | |
355 | } | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
02d86a56 EP |
360 | static int audit_field_compare(struct task_struct *tsk, |
361 | const struct cred *cred, | |
362 | struct audit_field *f, | |
363 | struct audit_context *ctx, | |
364 | struct audit_names *name) | |
365 | { | |
02d86a56 | 366 | switch (f->val) { |
4a6633ed | 367 | /* process to file object comparisons */ |
02d86a56 | 368 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
ca57ec0f | 369 | return audit_compare_uid(cred->uid, name, f, ctx); |
c9fe685f | 370 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
ca57ec0f | 371 | return audit_compare_gid(cred->gid, name, f, ctx); |
4a6633ed | 372 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
ca57ec0f | 373 | return audit_compare_uid(cred->euid, name, f, ctx); |
4a6633ed | 374 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
ca57ec0f | 375 | return audit_compare_gid(cred->egid, name, f, ctx); |
4a6633ed | 376 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
38f80590 | 377 | return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx); |
4a6633ed | 378 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
ca57ec0f | 379 | return audit_compare_uid(cred->suid, name, f, ctx); |
4a6633ed | 380 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
ca57ec0f | 381 | return audit_compare_gid(cred->sgid, name, f, ctx); |
4a6633ed | 382 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
ca57ec0f | 383 | return audit_compare_uid(cred->fsuid, name, f, ctx); |
4a6633ed | 384 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
ca57ec0f | 385 | return audit_compare_gid(cred->fsgid, name, f, ctx); |
10d68360 PM |
386 | /* uid comparisons */ |
387 | case AUDIT_COMPARE_UID_TO_AUID: | |
38f80590 RGB |
388 | return audit_uid_comparator(cred->uid, f->op, |
389 | audit_get_loginuid(tsk)); | |
10d68360 | 390 | case AUDIT_COMPARE_UID_TO_EUID: |
ca57ec0f | 391 | return audit_uid_comparator(cred->uid, f->op, cred->euid); |
10d68360 | 392 | case AUDIT_COMPARE_UID_TO_SUID: |
ca57ec0f | 393 | return audit_uid_comparator(cred->uid, f->op, cred->suid); |
10d68360 | 394 | case AUDIT_COMPARE_UID_TO_FSUID: |
ca57ec0f | 395 | return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
10d68360 PM |
396 | /* auid comparisons */ |
397 | case AUDIT_COMPARE_AUID_TO_EUID: | |
38f80590 RGB |
398 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
399 | cred->euid); | |
10d68360 | 400 | case AUDIT_COMPARE_AUID_TO_SUID: |
38f80590 RGB |
401 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
402 | cred->suid); | |
10d68360 | 403 | case AUDIT_COMPARE_AUID_TO_FSUID: |
38f80590 RGB |
404 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
405 | cred->fsuid); | |
10d68360 PM |
406 | /* euid comparisons */ |
407 | case AUDIT_COMPARE_EUID_TO_SUID: | |
ca57ec0f | 408 | return audit_uid_comparator(cred->euid, f->op, cred->suid); |
10d68360 | 409 | case AUDIT_COMPARE_EUID_TO_FSUID: |
ca57ec0f | 410 | return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
10d68360 PM |
411 | /* suid comparisons */ |
412 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
ca57ec0f | 413 | return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
10d68360 PM |
414 | /* gid comparisons */ |
415 | case AUDIT_COMPARE_GID_TO_EGID: | |
ca57ec0f | 416 | return audit_gid_comparator(cred->gid, f->op, cred->egid); |
10d68360 | 417 | case AUDIT_COMPARE_GID_TO_SGID: |
ca57ec0f | 418 | return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
10d68360 | 419 | case AUDIT_COMPARE_GID_TO_FSGID: |
ca57ec0f | 420 | return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
10d68360 PM |
421 | /* egid comparisons */ |
422 | case AUDIT_COMPARE_EGID_TO_SGID: | |
ca57ec0f | 423 | return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
10d68360 | 424 | case AUDIT_COMPARE_EGID_TO_FSGID: |
ca57ec0f | 425 | return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
10d68360 PM |
426 | /* sgid comparison */ |
427 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
ca57ec0f | 428 | return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
02d86a56 EP |
429 | default: |
430 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
431 | return 0; | |
432 | } | |
433 | return 0; | |
434 | } | |
435 | ||
f368c07d | 436 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 437 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
438 | * otherwise. |
439 | * | |
440 | * If task_creation is true, this is an explicit indication that we are | |
441 | * filtering a task rule at task creation time. This and tsk == current are | |
442 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
443 | */ | |
1da177e4 | 444 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 445 | struct audit_krule *rule, |
1da177e4 | 446 | struct audit_context *ctx, |
f368c07d | 447 | struct audit_names *name, |
f5629883 TJ |
448 | enum audit_state *state, |
449 | bool task_creation) | |
1da177e4 | 450 | { |
f5629883 | 451 | const struct cred *cred; |
5195d8e2 | 452 | int i, need_sid = 1; |
3dc7e315 | 453 | u32 sid; |
8fae4770 | 454 | unsigned int sessionid; |
3dc7e315 | 455 | |
f5629883 TJ |
456 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
457 | ||
1da177e4 | 458 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 459 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 460 | struct audit_names *n; |
1da177e4 | 461 | int result = 0; |
f1dc4867 | 462 | pid_t pid; |
1da177e4 | 463 | |
93315ed6 | 464 | switch (f->type) { |
1da177e4 | 465 | case AUDIT_PID: |
fa2bea2f | 466 | pid = task_tgid_nr(tsk); |
f1dc4867 | 467 | result = audit_comparator(pid, f->op, f->val); |
1da177e4 | 468 | break; |
3c66251e | 469 | case AUDIT_PPID: |
419c58f1 AV |
470 | if (ctx) { |
471 | if (!ctx->ppid) | |
c92cdeb4 | 472 | ctx->ppid = task_ppid_nr(tsk); |
3c66251e | 473 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 474 | } |
3c66251e | 475 | break; |
34d99af5 RGB |
476 | case AUDIT_EXE: |
477 | result = audit_exe_compare(tsk, rule->exe); | |
23bcc480 OM |
478 | if (f->op == Audit_not_equal) |
479 | result = !result; | |
34d99af5 | 480 | break; |
1da177e4 | 481 | case AUDIT_UID: |
ca57ec0f | 482 | result = audit_uid_comparator(cred->uid, f->op, f->uid); |
1da177e4 LT |
483 | break; |
484 | case AUDIT_EUID: | |
ca57ec0f | 485 | result = audit_uid_comparator(cred->euid, f->op, f->uid); |
1da177e4 LT |
486 | break; |
487 | case AUDIT_SUID: | |
ca57ec0f | 488 | result = audit_uid_comparator(cred->suid, f->op, f->uid); |
1da177e4 LT |
489 | break; |
490 | case AUDIT_FSUID: | |
ca57ec0f | 491 | result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
1da177e4 LT |
492 | break; |
493 | case AUDIT_GID: | |
ca57ec0f | 494 | result = audit_gid_comparator(cred->gid, f->op, f->gid); |
37eebe39 MI |
495 | if (f->op == Audit_equal) { |
496 | if (!result) | |
497 | result = in_group_p(f->gid); | |
498 | } else if (f->op == Audit_not_equal) { | |
499 | if (result) | |
500 | result = !in_group_p(f->gid); | |
501 | } | |
1da177e4 LT |
502 | break; |
503 | case AUDIT_EGID: | |
ca57ec0f | 504 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39 MI |
505 | if (f->op == Audit_equal) { |
506 | if (!result) | |
507 | result = in_egroup_p(f->gid); | |
508 | } else if (f->op == Audit_not_equal) { | |
509 | if (result) | |
510 | result = !in_egroup_p(f->gid); | |
511 | } | |
1da177e4 LT |
512 | break; |
513 | case AUDIT_SGID: | |
ca57ec0f | 514 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
515 | break; |
516 | case AUDIT_FSGID: | |
ca57ec0f | 517 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 | 518 | break; |
8fae4770 | 519 | case AUDIT_SESSIONID: |
5b713886 | 520 | sessionid = audit_get_sessionid(tsk); |
8fae4770 RGB |
521 | result = audit_comparator(sessionid, f->op, f->val); |
522 | break; | |
1da177e4 | 523 | case AUDIT_PERS: |
93315ed6 | 524 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 525 | break; |
2fd6f58b | 526 | case AUDIT_ARCH: |
9f8dbe9c | 527 | if (ctx) |
93315ed6 | 528 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 529 | break; |
1da177e4 LT |
530 | |
531 | case AUDIT_EXIT: | |
532 | if (ctx && ctx->return_valid) | |
93315ed6 | 533 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
534 | break; |
535 | case AUDIT_SUCCESS: | |
b01f2cc1 | 536 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
537 | if (f->val) |
538 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 539 | else |
93315ed6 | 540 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 541 | } |
1da177e4 LT |
542 | break; |
543 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
544 | if (name) { |
545 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
546 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
547 | ++result; | |
548 | } else if (ctx) { | |
5195d8e2 | 549 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
550 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
551 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
552 | ++result; |
553 | break; | |
554 | } | |
555 | } | |
556 | } | |
557 | break; | |
558 | case AUDIT_DEVMINOR: | |
16c174bd EP |
559 | if (name) { |
560 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
561 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
562 | ++result; | |
563 | } else if (ctx) { | |
5195d8e2 | 564 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
565 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
566 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
567 | ++result; |
568 | break; | |
569 | } | |
570 | } | |
571 | } | |
572 | break; | |
573 | case AUDIT_INODE: | |
f368c07d | 574 | if (name) |
db510fc5 | 575 | result = audit_comparator(name->ino, f->op, f->val); |
f368c07d | 576 | else if (ctx) { |
5195d8e2 EP |
577 | list_for_each_entry(n, &ctx->names_list, list) { |
578 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
579 | ++result; |
580 | break; | |
581 | } | |
582 | } | |
583 | } | |
584 | break; | |
efaffd6e EP |
585 | case AUDIT_OBJ_UID: |
586 | if (name) { | |
ca57ec0f | 587 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
588 | } else if (ctx) { |
589 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 590 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
591 | ++result; |
592 | break; | |
593 | } | |
594 | } | |
595 | } | |
596 | break; | |
54d3218b EP |
597 | case AUDIT_OBJ_GID: |
598 | if (name) { | |
ca57ec0f | 599 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
600 | } else if (ctx) { |
601 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 602 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
603 | ++result; |
604 | break; | |
605 | } | |
606 | } | |
607 | } | |
608 | break; | |
f368c07d | 609 | case AUDIT_WATCH: |
ae7b8f41 EP |
610 | if (name) |
611 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 612 | break; |
74c3cbe3 AV |
613 | case AUDIT_DIR: |
614 | if (ctx) | |
615 | result = match_tree_refs(ctx, rule->tree); | |
616 | break; | |
1da177e4 | 617 | case AUDIT_LOGINUID: |
38f80590 RGB |
618 | result = audit_uid_comparator(audit_get_loginuid(tsk), |
619 | f->op, f->uid); | |
1da177e4 | 620 | break; |
780a7654 EB |
621 | case AUDIT_LOGINUID_SET: |
622 | result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); | |
623 | break; | |
3a6b9f85 DG |
624 | case AUDIT_SUBJ_USER: |
625 | case AUDIT_SUBJ_ROLE: | |
626 | case AUDIT_SUBJ_TYPE: | |
627 | case AUDIT_SUBJ_SEN: | |
628 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
629 | /* NOTE: this may return negative values indicating |
630 | a temporary error. We simply treat this as a | |
631 | match for now to avoid losing information that | |
632 | may be wanted. An error message will also be | |
633 | logged upon error */ | |
04305e4a | 634 | if (f->lsm_rule) { |
2ad312d2 | 635 | if (need_sid) { |
2a862b32 | 636 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
637 | need_sid = 0; |
638 | } | |
d7a96f3a | 639 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 640 | f->op, |
04305e4a | 641 | f->lsm_rule, |
3dc7e315 | 642 | ctx); |
2ad312d2 | 643 | } |
3dc7e315 | 644 | break; |
6e5a2d1d DG |
645 | case AUDIT_OBJ_USER: |
646 | case AUDIT_OBJ_ROLE: | |
647 | case AUDIT_OBJ_TYPE: | |
648 | case AUDIT_OBJ_LEV_LOW: | |
649 | case AUDIT_OBJ_LEV_HIGH: | |
650 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
651 | also applies here */ | |
04305e4a | 652 | if (f->lsm_rule) { |
6e5a2d1d DG |
653 | /* Find files that match */ |
654 | if (name) { | |
d7a96f3a | 655 | result = security_audit_rule_match( |
6e5a2d1d | 656 | name->osid, f->type, f->op, |
04305e4a | 657 | f->lsm_rule, ctx); |
6e5a2d1d | 658 | } else if (ctx) { |
5195d8e2 EP |
659 | list_for_each_entry(n, &ctx->names_list, list) { |
660 | if (security_audit_rule_match(n->osid, f->type, | |
661 | f->op, f->lsm_rule, | |
662 | ctx)) { | |
6e5a2d1d DG |
663 | ++result; |
664 | break; | |
665 | } | |
666 | } | |
667 | } | |
668 | /* Find ipc objects that match */ | |
a33e6751 AV |
669 | if (!ctx || ctx->type != AUDIT_IPC) |
670 | break; | |
671 | if (security_audit_rule_match(ctx->ipc.osid, | |
672 | f->type, f->op, | |
673 | f->lsm_rule, ctx)) | |
674 | ++result; | |
6e5a2d1d DG |
675 | } |
676 | break; | |
1da177e4 LT |
677 | case AUDIT_ARG0: |
678 | case AUDIT_ARG1: | |
679 | case AUDIT_ARG2: | |
680 | case AUDIT_ARG3: | |
681 | if (ctx) | |
93315ed6 | 682 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 683 | break; |
5adc8a6a AG |
684 | case AUDIT_FILTERKEY: |
685 | /* ignore this field for filtering */ | |
686 | result = 1; | |
687 | break; | |
55669bfa AV |
688 | case AUDIT_PERM: |
689 | result = audit_match_perm(ctx, f->val); | |
690 | break; | |
8b67dca9 AV |
691 | case AUDIT_FILETYPE: |
692 | result = audit_match_filetype(ctx, f->val); | |
693 | break; | |
02d86a56 EP |
694 | case AUDIT_FIELD_COMPARE: |
695 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
696 | break; | |
1da177e4 | 697 | } |
f5629883 | 698 | if (!result) |
1da177e4 LT |
699 | return 0; |
700 | } | |
0590b933 AV |
701 | |
702 | if (ctx) { | |
703 | if (rule->prio <= ctx->prio) | |
704 | return 0; | |
705 | if (rule->filterkey) { | |
706 | kfree(ctx->filterkey); | |
707 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
708 | } | |
709 | ctx->prio = rule->prio; | |
710 | } | |
1da177e4 | 711 | switch (rule->action) { |
66b12abc PM |
712 | case AUDIT_NEVER: |
713 | *state = AUDIT_DISABLED; | |
714 | break; | |
715 | case AUDIT_ALWAYS: | |
716 | *state = AUDIT_RECORD_CONTEXT; | |
717 | break; | |
1da177e4 LT |
718 | } |
719 | return 1; | |
720 | } | |
721 | ||
722 | /* At process creation time, we can determine if system-call auditing is | |
723 | * completely disabled for this task. Since we only have the task | |
724 | * structure at this point, we can only check uid and gid. | |
725 | */ | |
e048e02c | 726 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
727 | { |
728 | struct audit_entry *e; | |
729 | enum audit_state state; | |
730 | ||
731 | rcu_read_lock(); | |
0f45aa18 | 732 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
733 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
734 | &state, true)) { | |
e048e02c AV |
735 | if (state == AUDIT_RECORD_CONTEXT) |
736 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
737 | rcu_read_unlock(); |
738 | return state; | |
739 | } | |
740 | } | |
741 | rcu_read_unlock(); | |
742 | return AUDIT_BUILD_CONTEXT; | |
743 | } | |
744 | ||
a3c54931 AL |
745 | static int audit_in_mask(const struct audit_krule *rule, unsigned long val) |
746 | { | |
747 | int word, bit; | |
748 | ||
749 | if (val > 0xffffffff) | |
750 | return false; | |
751 | ||
752 | word = AUDIT_WORD(val); | |
753 | if (word >= AUDIT_BITMASK_SIZE) | |
754 | return false; | |
755 | ||
756 | bit = AUDIT_BIT(val); | |
757 | ||
758 | return rule->mask[word] & bit; | |
759 | } | |
760 | ||
1da177e4 LT |
761 | /* At syscall entry and exit time, this filter is called if the |
762 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 763 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 764 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
765 | */ |
766 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
767 | struct audit_context *ctx, | |
768 | struct list_head *list) | |
769 | { | |
770 | struct audit_entry *e; | |
c3896495 | 771 | enum audit_state state; |
1da177e4 | 772 | |
5b52330b | 773 | if (auditd_test_task(tsk)) |
f7056d64 DW |
774 | return AUDIT_DISABLED; |
775 | ||
1da177e4 | 776 | rcu_read_lock(); |
c3896495 | 777 | if (!list_empty(list)) { |
b63862f4 | 778 | list_for_each_entry_rcu(e, list, list) { |
a3c54931 | 779 | if (audit_in_mask(&e->rule, ctx->major) && |
f368c07d | 780 | audit_filter_rules(tsk, &e->rule, ctx, NULL, |
f5629883 | 781 | &state, false)) { |
f368c07d | 782 | rcu_read_unlock(); |
0590b933 | 783 | ctx->current_state = state; |
f368c07d AG |
784 | return state; |
785 | } | |
786 | } | |
787 | } | |
788 | rcu_read_unlock(); | |
789 | return AUDIT_BUILD_CONTEXT; | |
790 | } | |
791 | ||
5195d8e2 EP |
792 | /* |
793 | * Given an audit_name check the inode hash table to see if they match. | |
794 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
795 | */ | |
796 | static int audit_filter_inode_name(struct task_struct *tsk, | |
797 | struct audit_names *n, | |
798 | struct audit_context *ctx) { | |
5195d8e2 EP |
799 | int h = audit_hash_ino((u32)n->ino); |
800 | struct list_head *list = &audit_inode_hash[h]; | |
801 | struct audit_entry *e; | |
802 | enum audit_state state; | |
803 | ||
5195d8e2 EP |
804 | if (list_empty(list)) |
805 | return 0; | |
806 | ||
807 | list_for_each_entry_rcu(e, list, list) { | |
a3c54931 | 808 | if (audit_in_mask(&e->rule, ctx->major) && |
5195d8e2 EP |
809 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { |
810 | ctx->current_state = state; | |
811 | return 1; | |
812 | } | |
813 | } | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 819 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 820 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
821 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
822 | */ | |
0590b933 | 823 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 824 | { |
5195d8e2 | 825 | struct audit_names *n; |
f368c07d | 826 | |
5b52330b | 827 | if (auditd_test_task(tsk)) |
0590b933 | 828 | return; |
f368c07d AG |
829 | |
830 | rcu_read_lock(); | |
f368c07d | 831 | |
5195d8e2 EP |
832 | list_for_each_entry(n, &ctx->names_list, list) { |
833 | if (audit_filter_inode_name(tsk, n, ctx)) | |
834 | break; | |
0f45aa18 DW |
835 | } |
836 | rcu_read_unlock(); | |
0f45aa18 DW |
837 | } |
838 | ||
4a3eb726 RGB |
839 | /* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */ |
840 | static inline struct audit_context *audit_take_context(struct task_struct *tsk, | |
1da177e4 | 841 | int return_valid, |
6d208da8 | 842 | long return_code) |
1da177e4 LT |
843 | { |
844 | struct audit_context *context = tsk->audit_context; | |
845 | ||
56179a6e | 846 | if (!context) |
1da177e4 LT |
847 | return NULL; |
848 | context->return_valid = return_valid; | |
f701b75e EP |
849 | |
850 | /* | |
851 | * we need to fix up the return code in the audit logs if the actual | |
852 | * return codes are later going to be fixed up by the arch specific | |
853 | * signal handlers | |
854 | * | |
855 | * This is actually a test for: | |
856 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
857 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
858 | * | |
859 | * but is faster than a bunch of || | |
860 | */ | |
861 | if (unlikely(return_code <= -ERESTARTSYS) && | |
862 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
863 | (return_code != -ENOIOCTLCMD)) | |
864 | context->return_code = -EINTR; | |
865 | else | |
866 | context->return_code = return_code; | |
1da177e4 | 867 | |
0590b933 AV |
868 | if (context->in_syscall && !context->dummy) { |
869 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
870 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
871 | } |
872 | ||
c0b0ae8a | 873 | audit_set_context(tsk, NULL); |
1da177e4 LT |
874 | return context; |
875 | } | |
876 | ||
3f1c8250 WR |
877 | static inline void audit_proctitle_free(struct audit_context *context) |
878 | { | |
879 | kfree(context->proctitle.value); | |
880 | context->proctitle.value = NULL; | |
881 | context->proctitle.len = 0; | |
882 | } | |
883 | ||
1da177e4 LT |
884 | static inline void audit_free_names(struct audit_context *context) |
885 | { | |
5195d8e2 | 886 | struct audit_names *n, *next; |
1da177e4 | 887 | |
5195d8e2 EP |
888 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
889 | list_del(&n->list); | |
55422d0b PM |
890 | if (n->name) |
891 | putname(n->name); | |
5195d8e2 EP |
892 | if (n->should_free) |
893 | kfree(n); | |
8c8570fb | 894 | } |
1da177e4 | 895 | context->name_count = 0; |
44707fdf JB |
896 | path_put(&context->pwd); |
897 | context->pwd.dentry = NULL; | |
898 | context->pwd.mnt = NULL; | |
1da177e4 LT |
899 | } |
900 | ||
901 | static inline void audit_free_aux(struct audit_context *context) | |
902 | { | |
903 | struct audit_aux_data *aux; | |
904 | ||
905 | while ((aux = context->aux)) { | |
906 | context->aux = aux->next; | |
907 | kfree(aux); | |
908 | } | |
e54dc243 AG |
909 | while ((aux = context->aux_pids)) { |
910 | context->aux_pids = aux->next; | |
911 | kfree(aux); | |
912 | } | |
1da177e4 LT |
913 | } |
914 | ||
1da177e4 LT |
915 | static inline struct audit_context *audit_alloc_context(enum audit_state state) |
916 | { | |
917 | struct audit_context *context; | |
918 | ||
17c6ee70 RM |
919 | context = kzalloc(sizeof(*context), GFP_KERNEL); |
920 | if (!context) | |
1da177e4 | 921 | return NULL; |
e2c5adc8 AM |
922 | context->state = state; |
923 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; | |
916d7576 | 924 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 925 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
926 | return context; |
927 | } | |
928 | ||
b0dd25a8 RD |
929 | /** |
930 | * audit_alloc - allocate an audit context block for a task | |
931 | * @tsk: task | |
932 | * | |
933 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
934 | * if necessary. Doing so turns on system call auditing for the |
935 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
936 | * needed. |
937 | */ | |
1da177e4 LT |
938 | int audit_alloc(struct task_struct *tsk) |
939 | { | |
940 | struct audit_context *context; | |
941 | enum audit_state state; | |
e048e02c | 942 | char *key = NULL; |
1da177e4 | 943 | |
b593d384 | 944 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
945 | return 0; /* Return if not auditing. */ |
946 | ||
e048e02c | 947 | state = audit_filter_task(tsk, &key); |
d48d8051 ON |
948 | if (state == AUDIT_DISABLED) { |
949 | clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1da177e4 | 950 | return 0; |
d48d8051 | 951 | } |
1da177e4 LT |
952 | |
953 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 954 | kfree(key); |
1da177e4 LT |
955 | audit_log_lost("out of memory in audit_alloc"); |
956 | return -ENOMEM; | |
957 | } | |
e048e02c | 958 | context->filterkey = key; |
1da177e4 | 959 | |
c0b0ae8a | 960 | audit_set_context(tsk, context); |
1da177e4 LT |
961 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); |
962 | return 0; | |
963 | } | |
964 | ||
965 | static inline void audit_free_context(struct audit_context *context) | |
966 | { | |
c62d773a AV |
967 | audit_free_names(context); |
968 | unroll_tree_refs(context, NULL, 0); | |
969 | free_tree_refs(context); | |
970 | audit_free_aux(context); | |
971 | kfree(context->filterkey); | |
972 | kfree(context->sockaddr); | |
3f1c8250 | 973 | audit_proctitle_free(context); |
c62d773a | 974 | kfree(context); |
1da177e4 LT |
975 | } |
976 | ||
e54dc243 | 977 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9 | 978 | kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b | 979 | u32 sid, char *comm) |
e54dc243 AG |
980 | { |
981 | struct audit_buffer *ab; | |
2a862b32 | 982 | char *ctx = NULL; |
e54dc243 AG |
983 | u32 len; |
984 | int rc = 0; | |
985 | ||
986 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
987 | if (!ab) | |
6246ccab | 988 | return rc; |
e54dc243 | 989 | |
e1760bd5 EB |
990 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
991 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 992 | from_kuid(&init_user_ns, uid), sessionid); |
ad395abe EP |
993 | if (sid) { |
994 | if (security_secid_to_secctx(sid, &ctx, &len)) { | |
995 | audit_log_format(ab, " obj=(none)"); | |
996 | rc = 1; | |
997 | } else { | |
998 | audit_log_format(ab, " obj=%s", ctx); | |
999 | security_release_secctx(ctx, len); | |
1000 | } | |
2a862b32 | 1001 | } |
c2a7780e EP |
1002 | audit_log_format(ab, " ocomm="); |
1003 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1004 | audit_log_end(ab); |
e54dc243 AG |
1005 | |
1006 | return rc; | |
1007 | } | |
1008 | ||
43761473 PM |
1009 | static void audit_log_execve_info(struct audit_context *context, |
1010 | struct audit_buffer **ab) | |
bdf4c48a | 1011 | { |
43761473 PM |
1012 | long len_max; |
1013 | long len_rem; | |
1014 | long len_full; | |
1015 | long len_buf; | |
8443075e | 1016 | long len_abuf = 0; |
43761473 PM |
1017 | long len_tmp; |
1018 | bool require_data; | |
1019 | bool encode; | |
1020 | unsigned int iter; | |
1021 | unsigned int arg; | |
1022 | char *buf_head; | |
1023 | char *buf; | |
1024 | const char __user *p = (const char __user *)current->mm->arg_start; | |
1025 | ||
1026 | /* NOTE: this buffer needs to be large enough to hold all the non-arg | |
1027 | * data we put in the audit record for this argument (see the | |
1028 | * code below) ... at this point in time 96 is plenty */ | |
1029 | char abuf[96]; | |
1030 | ||
1031 | /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the | |
1032 | * current value of 7500 is not as important as the fact that it | |
1033 | * is less than 8k, a setting of 7500 gives us plenty of wiggle | |
1034 | * room if we go over a little bit in the logging below */ | |
1035 | WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500); | |
1036 | len_max = MAX_EXECVE_AUDIT_LEN; | |
1037 | ||
1038 | /* scratch buffer to hold the userspace args */ | |
1039 | buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1040 | if (!buf_head) { | |
1041 | audit_panic("out of memory for argv string"); | |
1042 | return; | |
de6bbd1d | 1043 | } |
43761473 | 1044 | buf = buf_head; |
040b3a2d | 1045 | |
43761473 | 1046 | audit_log_format(*ab, "argc=%d", context->execve.argc); |
040b3a2d | 1047 | |
43761473 PM |
1048 | len_rem = len_max; |
1049 | len_buf = 0; | |
1050 | len_full = 0; | |
1051 | require_data = true; | |
1052 | encode = false; | |
1053 | iter = 0; | |
1054 | arg = 0; | |
de6bbd1d | 1055 | do { |
43761473 PM |
1056 | /* NOTE: we don't ever want to trust this value for anything |
1057 | * serious, but the audit record format insists we | |
1058 | * provide an argument length for really long arguments, | |
1059 | * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but | |
1060 | * to use strncpy_from_user() to obtain this value for | |
1061 | * recording in the log, although we don't use it | |
1062 | * anywhere here to avoid a double-fetch problem */ | |
1063 | if (len_full == 0) | |
1064 | len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
1065 | ||
1066 | /* read more data from userspace */ | |
1067 | if (require_data) { | |
1068 | /* can we make more room in the buffer? */ | |
1069 | if (buf != buf_head) { | |
1070 | memmove(buf_head, buf, len_buf); | |
1071 | buf = buf_head; | |
1072 | } | |
1073 | ||
1074 | /* fetch as much as we can of the argument */ | |
1075 | len_tmp = strncpy_from_user(&buf_head[len_buf], p, | |
1076 | len_max - len_buf); | |
1077 | if (len_tmp == -EFAULT) { | |
1078 | /* unable to copy from userspace */ | |
1079 | send_sig(SIGKILL, current, 0); | |
1080 | goto out; | |
1081 | } else if (len_tmp == (len_max - len_buf)) { | |
1082 | /* buffer is not large enough */ | |
1083 | require_data = true; | |
1084 | /* NOTE: if we are going to span multiple | |
1085 | * buffers force the encoding so we stand | |
1086 | * a chance at a sane len_full value and | |
1087 | * consistent record encoding */ | |
1088 | encode = true; | |
1089 | len_full = len_full * 2; | |
1090 | p += len_tmp; | |
1091 | } else { | |
1092 | require_data = false; | |
1093 | if (!encode) | |
1094 | encode = audit_string_contains_control( | |
1095 | buf, len_tmp); | |
1096 | /* try to use a trusted value for len_full */ | |
1097 | if (len_full < len_max) | |
1098 | len_full = (encode ? | |
1099 | len_tmp * 2 : len_tmp); | |
1100 | p += len_tmp + 1; | |
1101 | } | |
1102 | len_buf += len_tmp; | |
1103 | buf_head[len_buf] = '\0'; | |
bdf4c48a | 1104 | |
43761473 PM |
1105 | /* length of the buffer in the audit record? */ |
1106 | len_abuf = (encode ? len_buf * 2 : len_buf + 2); | |
bdf4c48a | 1107 | } |
de6bbd1d | 1108 | |
43761473 PM |
1109 | /* write as much as we can to the audit log */ |
1110 | if (len_buf > 0) { | |
1111 | /* NOTE: some magic numbers here - basically if we | |
1112 | * can't fit a reasonable amount of data into the | |
1113 | * existing audit buffer, flush it and start with | |
1114 | * a new buffer */ | |
1115 | if ((sizeof(abuf) + 8) > len_rem) { | |
1116 | len_rem = len_max; | |
1117 | audit_log_end(*ab); | |
1118 | *ab = audit_log_start(context, | |
1119 | GFP_KERNEL, AUDIT_EXECVE); | |
1120 | if (!*ab) | |
1121 | goto out; | |
1122 | } | |
bdf4c48a | 1123 | |
43761473 PM |
1124 | /* create the non-arg portion of the arg record */ |
1125 | len_tmp = 0; | |
1126 | if (require_data || (iter > 0) || | |
1127 | ((len_abuf + sizeof(abuf)) > len_rem)) { | |
1128 | if (iter == 0) { | |
1129 | len_tmp += snprintf(&abuf[len_tmp], | |
1130 | sizeof(abuf) - len_tmp, | |
1131 | " a%d_len=%lu", | |
1132 | arg, len_full); | |
1133 | } | |
1134 | len_tmp += snprintf(&abuf[len_tmp], | |
1135 | sizeof(abuf) - len_tmp, | |
1136 | " a%d[%d]=", arg, iter++); | |
1137 | } else | |
1138 | len_tmp += snprintf(&abuf[len_tmp], | |
1139 | sizeof(abuf) - len_tmp, | |
1140 | " a%d=", arg); | |
1141 | WARN_ON(len_tmp >= sizeof(abuf)); | |
1142 | abuf[sizeof(abuf) - 1] = '\0'; | |
1143 | ||
1144 | /* log the arg in the audit record */ | |
1145 | audit_log_format(*ab, "%s", abuf); | |
1146 | len_rem -= len_tmp; | |
1147 | len_tmp = len_buf; | |
1148 | if (encode) { | |
1149 | if (len_abuf > len_rem) | |
1150 | len_tmp = len_rem / 2; /* encoding */ | |
1151 | audit_log_n_hex(*ab, buf, len_tmp); | |
1152 | len_rem -= len_tmp * 2; | |
1153 | len_abuf -= len_tmp * 2; | |
1154 | } else { | |
1155 | if (len_abuf > len_rem) | |
1156 | len_tmp = len_rem - 2; /* quotes */ | |
1157 | audit_log_n_string(*ab, buf, len_tmp); | |
1158 | len_rem -= len_tmp + 2; | |
1159 | /* don't subtract the "2" because we still need | |
1160 | * to add quotes to the remaining string */ | |
1161 | len_abuf -= len_tmp; | |
1162 | } | |
1163 | len_buf -= len_tmp; | |
1164 | buf += len_tmp; | |
1165 | } | |
bdf4c48a | 1166 | |
43761473 PM |
1167 | /* ready to move to the next argument? */ |
1168 | if ((len_buf == 0) && !require_data) { | |
1169 | arg++; | |
1170 | iter = 0; | |
1171 | len_full = 0; | |
1172 | require_data = true; | |
1173 | encode = false; | |
1174 | } | |
1175 | } while (arg < context->execve.argc); | |
de6bbd1d | 1176 | |
43761473 | 1177 | /* NOTE: the caller handles the final audit_log_end() call */ |
de6bbd1d | 1178 | |
43761473 PM |
1179 | out: |
1180 | kfree(buf_head); | |
bdf4c48a PZ |
1181 | } |
1182 | ||
a33e6751 | 1183 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1184 | { |
1185 | struct audit_buffer *ab; | |
1186 | int i; | |
1187 | ||
1188 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1189 | if (!ab) | |
1190 | return; | |
1191 | ||
1192 | switch (context->type) { | |
1193 | case AUDIT_SOCKETCALL: { | |
1194 | int nargs = context->socketcall.nargs; | |
1195 | audit_log_format(ab, "nargs=%d", nargs); | |
1196 | for (i = 0; i < nargs; i++) | |
1197 | audit_log_format(ab, " a%d=%lx", i, | |
1198 | context->socketcall.args[i]); | |
1199 | break; } | |
a33e6751 AV |
1200 | case AUDIT_IPC: { |
1201 | u32 osid = context->ipc.osid; | |
1202 | ||
2570ebbd | 1203 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1204 | from_kuid(&init_user_ns, context->ipc.uid), |
1205 | from_kgid(&init_user_ns, context->ipc.gid), | |
1206 | context->ipc.mode); | |
a33e6751 AV |
1207 | if (osid) { |
1208 | char *ctx = NULL; | |
1209 | u32 len; | |
1210 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1211 | audit_log_format(ab, " osid=%u", osid); | |
1212 | *call_panic = 1; | |
1213 | } else { | |
1214 | audit_log_format(ab, " obj=%s", ctx); | |
1215 | security_release_secctx(ctx, len); | |
1216 | } | |
1217 | } | |
e816f370 AV |
1218 | if (context->ipc.has_perm) { |
1219 | audit_log_end(ab); | |
1220 | ab = audit_log_start(context, GFP_KERNEL, | |
1221 | AUDIT_IPC_SET_PERM); | |
0644ec0c KC |
1222 | if (unlikely(!ab)) |
1223 | return; | |
e816f370 | 1224 | audit_log_format(ab, |
2570ebbd | 1225 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1226 | context->ipc.qbytes, |
1227 | context->ipc.perm_uid, | |
1228 | context->ipc.perm_gid, | |
1229 | context->ipc.perm_mode); | |
e816f370 | 1230 | } |
a33e6751 | 1231 | break; } |
fe8e52b9 | 1232 | case AUDIT_MQ_OPEN: |
564f6993 | 1233 | audit_log_format(ab, |
df0a4283 | 1234 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1235 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1236 | context->mq_open.oflag, context->mq_open.mode, | |
1237 | context->mq_open.attr.mq_flags, | |
1238 | context->mq_open.attr.mq_maxmsg, | |
1239 | context->mq_open.attr.mq_msgsize, | |
1240 | context->mq_open.attr.mq_curmsgs); | |
fe8e52b9 PM |
1241 | break; |
1242 | case AUDIT_MQ_SENDRECV: | |
c32c8af4 AV |
1243 | audit_log_format(ab, |
1244 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
b9047726 | 1245 | "abs_timeout_sec=%lld abs_timeout_nsec=%ld", |
c32c8af4 AV |
1246 | context->mq_sendrecv.mqdes, |
1247 | context->mq_sendrecv.msg_len, | |
1248 | context->mq_sendrecv.msg_prio, | |
b9047726 | 1249 | (long long) context->mq_sendrecv.abs_timeout.tv_sec, |
c32c8af4 | 1250 | context->mq_sendrecv.abs_timeout.tv_nsec); |
fe8e52b9 PM |
1251 | break; |
1252 | case AUDIT_MQ_NOTIFY: | |
20114f71 AV |
1253 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", |
1254 | context->mq_notify.mqdes, | |
1255 | context->mq_notify.sigev_signo); | |
fe8e52b9 | 1256 | break; |
7392906e AV |
1257 | case AUDIT_MQ_GETSETATTR: { |
1258 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1259 | audit_log_format(ab, | |
1260 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1261 | "mq_curmsgs=%ld ", | |
1262 | context->mq_getsetattr.mqdes, | |
1263 | attr->mq_flags, attr->mq_maxmsg, | |
1264 | attr->mq_msgsize, attr->mq_curmsgs); | |
1265 | break; } | |
fe8e52b9 | 1266 | case AUDIT_CAPSET: |
57f71a0a AV |
1267 | audit_log_format(ab, "pid=%d", context->capset.pid); |
1268 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1269 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1270 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
7786f6b6 | 1271 | audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient); |
fe8e52b9 PM |
1272 | break; |
1273 | case AUDIT_MMAP: | |
120a795d AV |
1274 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, |
1275 | context->mmap.flags); | |
fe8e52b9 PM |
1276 | break; |
1277 | case AUDIT_EXECVE: | |
d9cfea91 | 1278 | audit_log_execve_info(context, &ab); |
fe8e52b9 | 1279 | break; |
ca86cad7 RGB |
1280 | case AUDIT_KERN_MODULE: |
1281 | audit_log_format(ab, "name="); | |
1282 | audit_log_untrustedstring(ab, context->module.name); | |
1283 | kfree(context->module.name); | |
1284 | break; | |
f3298dc4 AV |
1285 | } |
1286 | audit_log_end(ab); | |
1287 | } | |
1288 | ||
3f1c8250 WR |
1289 | static inline int audit_proctitle_rtrim(char *proctitle, int len) |
1290 | { | |
1291 | char *end = proctitle + len - 1; | |
1292 | while (end > proctitle && !isprint(*end)) | |
1293 | end--; | |
1294 | ||
1295 | /* catch the case where proctitle is only 1 non-print character */ | |
1296 | len = end - proctitle + 1; | |
1297 | len -= isprint(proctitle[len-1]) == 0; | |
1298 | return len; | |
1299 | } | |
1300 | ||
1301 | static void audit_log_proctitle(struct task_struct *tsk, | |
1302 | struct audit_context *context) | |
1303 | { | |
1304 | int res; | |
1305 | char *buf; | |
1306 | char *msg = "(null)"; | |
1307 | int len = strlen(msg); | |
1308 | struct audit_buffer *ab; | |
1309 | ||
1310 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE); | |
1311 | if (!ab) | |
1312 | return; /* audit_panic or being filtered */ | |
1313 | ||
1314 | audit_log_format(ab, "proctitle="); | |
1315 | ||
1316 | /* Not cached */ | |
1317 | if (!context->proctitle.value) { | |
1318 | buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL); | |
1319 | if (!buf) | |
1320 | goto out; | |
1321 | /* Historically called this from procfs naming */ | |
1322 | res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN); | |
1323 | if (res == 0) { | |
1324 | kfree(buf); | |
1325 | goto out; | |
1326 | } | |
1327 | res = audit_proctitle_rtrim(buf, res); | |
1328 | if (res == 0) { | |
1329 | kfree(buf); | |
1330 | goto out; | |
1331 | } | |
1332 | context->proctitle.value = buf; | |
1333 | context->proctitle.len = res; | |
1334 | } | |
1335 | msg = context->proctitle.value; | |
1336 | len = context->proctitle.len; | |
1337 | out: | |
1338 | audit_log_n_untrustedstring(ab, msg, len); | |
1339 | audit_log_end(ab); | |
1340 | } | |
1341 | ||
e495149b | 1342 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1343 | { |
9c7aa6aa | 1344 | int i, call_panic = 0; |
1da177e4 | 1345 | struct audit_buffer *ab; |
7551ced3 | 1346 | struct audit_aux_data *aux; |
5195d8e2 | 1347 | struct audit_names *n; |
1da177e4 | 1348 | |
e495149b | 1349 | /* tsk == current */ |
3f2792ff | 1350 | context->personality = tsk->personality; |
e495149b AV |
1351 | |
1352 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1353 | if (!ab) |
1354 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1355 | audit_log_format(ab, "arch=%x syscall=%d", |
1356 | context->arch, context->major); | |
1da177e4 LT |
1357 | if (context->personality != PER_LINUX) |
1358 | audit_log_format(ab, " per=%lx", context->personality); | |
1359 | if (context->return_valid) | |
9f8dbe9c | 1360 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b | 1361 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1362 | context->return_code); | |
eb84a20e | 1363 | |
1da177e4 | 1364 | audit_log_format(ab, |
e23eb920 PM |
1365 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1366 | context->argv[0], | |
1367 | context->argv[1], | |
1368 | context->argv[2], | |
1369 | context->argv[3], | |
1370 | context->name_count); | |
eb84a20e | 1371 | |
e495149b | 1372 | audit_log_task_info(ab, tsk); |
9d960985 | 1373 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1374 | audit_log_end(ab); |
1da177e4 | 1375 | |
7551ced3 | 1376 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1377 | |
e495149b | 1378 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1379 | if (!ab) |
1380 | continue; /* audit_panic has been called */ | |
1381 | ||
1da177e4 | 1382 | switch (aux->type) { |
20ca73bc | 1383 | |
3fc689e9 EP |
1384 | case AUDIT_BPRM_FCAPS: { |
1385 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1386 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1387 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1388 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1389 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1390 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1391 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1392 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
7786f6b6 RGB |
1393 | audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient); |
1394 | audit_log_cap(ab, "pp", &axs->new_pcap.permitted); | |
1395 | audit_log_cap(ab, "pi", &axs->new_pcap.inheritable); | |
1396 | audit_log_cap(ab, "pe", &axs->new_pcap.effective); | |
1397 | audit_log_cap(ab, "pa", &axs->new_pcap.ambient); | |
3fc689e9 EP |
1398 | break; } |
1399 | ||
1da177e4 LT |
1400 | } |
1401 | audit_log_end(ab); | |
1da177e4 LT |
1402 | } |
1403 | ||
f3298dc4 | 1404 | if (context->type) |
a33e6751 | 1405 | show_special(context, &call_panic); |
f3298dc4 | 1406 | |
157cf649 AV |
1407 | if (context->fds[0] >= 0) { |
1408 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1409 | if (ab) { | |
1410 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1411 | context->fds[0], context->fds[1]); | |
1412 | audit_log_end(ab); | |
1413 | } | |
1414 | } | |
1415 | ||
4f6b434f AV |
1416 | if (context->sockaddr_len) { |
1417 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1418 | if (ab) { | |
1419 | audit_log_format(ab, "saddr="); | |
1420 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1421 | context->sockaddr_len); | |
1422 | audit_log_end(ab); | |
1423 | } | |
1424 | } | |
1425 | ||
e54dc243 AG |
1426 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1427 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1428 | |
1429 | for (i = 0; i < axs->pid_count; i++) | |
1430 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1431 | axs->target_auid[i], |
1432 | axs->target_uid[i], | |
4746ec5b | 1433 | axs->target_sessionid[i], |
c2a7780e EP |
1434 | axs->target_sid[i], |
1435 | axs->target_comm[i])) | |
e54dc243 | 1436 | call_panic = 1; |
a5cb013d AV |
1437 | } |
1438 | ||
e54dc243 AG |
1439 | if (context->target_pid && |
1440 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1441 | context->target_auid, context->target_uid, |
4746ec5b | 1442 | context->target_sessionid, |
c2a7780e | 1443 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1444 | call_panic = 1; |
1445 | ||
44707fdf | 1446 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1447 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1448 | if (ab) { |
0b7a0fdb | 1449 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1450 | audit_log_end(ab); |
1451 | } | |
1452 | } | |
73241ccc | 1453 | |
5195d8e2 | 1454 | i = 0; |
79f6530c JL |
1455 | list_for_each_entry(n, &context->names_list, list) { |
1456 | if (n->hidden) | |
1457 | continue; | |
b24a30a7 | 1458 | audit_log_name(context, n, NULL, i++, &call_panic); |
79f6530c | 1459 | } |
c0641f28 | 1460 | |
3f1c8250 WR |
1461 | audit_log_proctitle(tsk, context); |
1462 | ||
c0641f28 EP |
1463 | /* Send end of event record to help user space know we are finished */ |
1464 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1465 | if (ab) | |
1466 | audit_log_end(ab); | |
9c7aa6aa SG |
1467 | if (call_panic) |
1468 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1469 | } |
1470 | ||
b0dd25a8 | 1471 | /** |
196a5085 | 1472 | * __audit_free - free a per-task audit context |
b0dd25a8 RD |
1473 | * @tsk: task whose audit context block to free |
1474 | * | |
fa84cb93 | 1475 | * Called from copy_process and do_exit |
b0dd25a8 | 1476 | */ |
a4ff8dba | 1477 | void __audit_free(struct task_struct *tsk) |
1da177e4 LT |
1478 | { |
1479 | struct audit_context *context; | |
1480 | ||
4a3eb726 | 1481 | context = audit_take_context(tsk, 0, 0); |
56179a6e | 1482 | if (!context) |
1da177e4 LT |
1483 | return; |
1484 | ||
1485 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1486 | * function (e.g., exit_group), then free context block. |
1487 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1488 | * in the context of the idle thread */ |
e495149b | 1489 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1490 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1491 | audit_log_exit(context, tsk); |
916d7576 AV |
1492 | if (!list_empty(&context->killed_trees)) |
1493 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1494 | |
1495 | audit_free_context(context); | |
1496 | } | |
1497 | ||
b0dd25a8 | 1498 | /** |
196a5085 | 1499 | * __audit_syscall_entry - fill in an audit record at syscall entry |
b0dd25a8 RD |
1500 | * @major: major syscall type (function) |
1501 | * @a1: additional syscall register 1 | |
1502 | * @a2: additional syscall register 2 | |
1503 | * @a3: additional syscall register 3 | |
1504 | * @a4: additional syscall register 4 | |
1505 | * | |
1506 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1507 | * audit context was created when the task was created and the state or |
1508 | * filters demand the audit context be built. If the state from the | |
1509 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1510 | * then the record will be written at syscall exit time (otherwise, it | |
1511 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1512 | * be written). |
1513 | */ | |
b4f0d375 RGB |
1514 | void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2, |
1515 | unsigned long a3, unsigned long a4) | |
1da177e4 | 1516 | { |
cdfb6b34 | 1517 | struct audit_context *context = audit_context(); |
1da177e4 LT |
1518 | enum audit_state state; |
1519 | ||
94d14e3e | 1520 | if (!audit_enabled || !context) |
86a1c34a | 1521 | return; |
1da177e4 | 1522 | |
1da177e4 LT |
1523 | BUG_ON(context->in_syscall || context->name_count); |
1524 | ||
1da177e4 | 1525 | state = context->state; |
5260ecc2 RGB |
1526 | if (state == AUDIT_DISABLED) |
1527 | return; | |
1528 | ||
d51374ad | 1529 | context->dummy = !audit_n_rules; |
0590b933 AV |
1530 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1531 | context->prio = 0; | |
cdfb6b34 | 1532 | if (auditd_test_task(current)) |
5260ecc2 | 1533 | return; |
0590b933 | 1534 | } |
1da177e4 | 1535 | |
5260ecc2 RGB |
1536 | context->arch = syscall_get_arch(); |
1537 | context->major = major; | |
1538 | context->argv[0] = a1; | |
1539 | context->argv[1] = a2; | |
1540 | context->argv[2] = a3; | |
1541 | context->argv[3] = a4; | |
ce625a80 | 1542 | context->serial = 0; |
e832bf48 | 1543 | context->ctime = current_kernel_time64(); |
1da177e4 | 1544 | context->in_syscall = 1; |
0590b933 | 1545 | context->current_state = state; |
419c58f1 | 1546 | context->ppid = 0; |
1da177e4 LT |
1547 | } |
1548 | ||
b0dd25a8 | 1549 | /** |
196a5085 | 1550 | * __audit_syscall_exit - deallocate audit context after a system call |
42ae610c RD |
1551 | * @success: success value of the syscall |
1552 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1553 | * |
1554 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1555 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1556 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1557 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1558 | * free the names stored from getname(). |
1559 | */ | |
d7e7528b | 1560 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 LT |
1561 | { |
1562 | struct audit_context *context; | |
1563 | ||
d7e7528b EP |
1564 | if (success) |
1565 | success = AUDITSC_SUCCESS; | |
1566 | else | |
1567 | success = AUDITSC_FAILURE; | |
1da177e4 | 1568 | |
cdfb6b34 | 1569 | context = audit_take_context(current, success, return_code); |
56179a6e | 1570 | if (!context) |
97e94c45 | 1571 | return; |
1da177e4 | 1572 | |
0590b933 | 1573 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
cdfb6b34 | 1574 | audit_log_exit(context, current); |
1da177e4 LT |
1575 | |
1576 | context->in_syscall = 0; | |
0590b933 | 1577 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1578 | |
916d7576 AV |
1579 | if (!list_empty(&context->killed_trees)) |
1580 | audit_kill_trees(&context->killed_trees); | |
1581 | ||
c62d773a AV |
1582 | audit_free_names(context); |
1583 | unroll_tree_refs(context, NULL, 0); | |
1584 | audit_free_aux(context); | |
1585 | context->aux = NULL; | |
1586 | context->aux_pids = NULL; | |
1587 | context->target_pid = 0; | |
1588 | context->target_sid = 0; | |
1589 | context->sockaddr_len = 0; | |
1590 | context->type = 0; | |
1591 | context->fds[0] = -1; | |
1592 | if (context->state != AUDIT_RECORD_CONTEXT) { | |
1593 | kfree(context->filterkey); | |
1594 | context->filterkey = NULL; | |
1da177e4 | 1595 | } |
c0b0ae8a | 1596 | audit_set_context(current, context); |
1da177e4 LT |
1597 | } |
1598 | ||
74c3cbe3 AV |
1599 | static inline void handle_one(const struct inode *inode) |
1600 | { | |
1601 | #ifdef CONFIG_AUDIT_TREE | |
1602 | struct audit_context *context; | |
1603 | struct audit_tree_refs *p; | |
1604 | struct audit_chunk *chunk; | |
1605 | int count; | |
08991e83 | 1606 | if (likely(!inode->i_fsnotify_marks)) |
74c3cbe3 | 1607 | return; |
cdfb6b34 | 1608 | context = audit_context(); |
74c3cbe3 AV |
1609 | p = context->trees; |
1610 | count = context->tree_count; | |
1611 | rcu_read_lock(); | |
1612 | chunk = audit_tree_lookup(inode); | |
1613 | rcu_read_unlock(); | |
1614 | if (!chunk) | |
1615 | return; | |
1616 | if (likely(put_tree_ref(context, chunk))) | |
1617 | return; | |
1618 | if (unlikely(!grow_tree_refs(context))) { | |
f952d10f | 1619 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1620 | audit_set_auditable(context); |
1621 | audit_put_chunk(chunk); | |
1622 | unroll_tree_refs(context, p, count); | |
1623 | return; | |
1624 | } | |
1625 | put_tree_ref(context, chunk); | |
1626 | #endif | |
1627 | } | |
1628 | ||
1629 | static void handle_path(const struct dentry *dentry) | |
1630 | { | |
1631 | #ifdef CONFIG_AUDIT_TREE | |
1632 | struct audit_context *context; | |
1633 | struct audit_tree_refs *p; | |
1634 | const struct dentry *d, *parent; | |
1635 | struct audit_chunk *drop; | |
1636 | unsigned long seq; | |
1637 | int count; | |
1638 | ||
cdfb6b34 | 1639 | context = audit_context(); |
74c3cbe3 AV |
1640 | p = context->trees; |
1641 | count = context->tree_count; | |
1642 | retry: | |
1643 | drop = NULL; | |
1644 | d = dentry; | |
1645 | rcu_read_lock(); | |
1646 | seq = read_seqbegin(&rename_lock); | |
1647 | for(;;) { | |
3b362157 | 1648 | struct inode *inode = d_backing_inode(d); |
08991e83 | 1649 | if (inode && unlikely(inode->i_fsnotify_marks)) { |
74c3cbe3 AV |
1650 | struct audit_chunk *chunk; |
1651 | chunk = audit_tree_lookup(inode); | |
1652 | if (chunk) { | |
1653 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1654 | drop = chunk; | |
1655 | break; | |
1656 | } | |
1657 | } | |
1658 | } | |
1659 | parent = d->d_parent; | |
1660 | if (parent == d) | |
1661 | break; | |
1662 | d = parent; | |
1663 | } | |
1664 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1665 | rcu_read_unlock(); | |
1666 | if (!drop) { | |
1667 | /* just a race with rename */ | |
1668 | unroll_tree_refs(context, p, count); | |
1669 | goto retry; | |
1670 | } | |
1671 | audit_put_chunk(drop); | |
1672 | if (grow_tree_refs(context)) { | |
1673 | /* OK, got more space */ | |
1674 | unroll_tree_refs(context, p, count); | |
1675 | goto retry; | |
1676 | } | |
1677 | /* too bad */ | |
f952d10f | 1678 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1679 | unroll_tree_refs(context, p, count); |
1680 | audit_set_auditable(context); | |
1681 | return; | |
1682 | } | |
1683 | rcu_read_unlock(); | |
1684 | #endif | |
1685 | } | |
1686 | ||
78e2e802 JL |
1687 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1688 | unsigned char type) | |
5195d8e2 EP |
1689 | { |
1690 | struct audit_names *aname; | |
1691 | ||
1692 | if (context->name_count < AUDIT_NAMES) { | |
1693 | aname = &context->preallocated_names[context->name_count]; | |
1694 | memset(aname, 0, sizeof(*aname)); | |
1695 | } else { | |
1696 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1697 | if (!aname) | |
1698 | return NULL; | |
1699 | aname->should_free = true; | |
1700 | } | |
1701 | ||
84cb777e | 1702 | aname->ino = AUDIT_INO_UNSET; |
78e2e802 | 1703 | aname->type = type; |
5195d8e2 EP |
1704 | list_add_tail(&aname->list, &context->names_list); |
1705 | ||
1706 | context->name_count++; | |
5195d8e2 EP |
1707 | return aname; |
1708 | } | |
1709 | ||
7ac86265 | 1710 | /** |
196a5085 | 1711 | * __audit_reusename - fill out filename with info from existing entry |
7ac86265 JL |
1712 | * @uptr: userland ptr to pathname |
1713 | * | |
1714 | * Search the audit_names list for the current audit context. If there is an | |
1715 | * existing entry with a matching "uptr" then return the filename | |
1716 | * associated with that audit_name. If not, return NULL. | |
1717 | */ | |
1718 | struct filename * | |
1719 | __audit_reusename(const __user char *uptr) | |
1720 | { | |
cdfb6b34 | 1721 | struct audit_context *context = audit_context(); |
7ac86265 JL |
1722 | struct audit_names *n; |
1723 | ||
1724 | list_for_each_entry(n, &context->names_list, list) { | |
1725 | if (!n->name) | |
1726 | continue; | |
55422d0b PM |
1727 | if (n->name->uptr == uptr) { |
1728 | n->name->refcnt++; | |
7ac86265 | 1729 | return n->name; |
55422d0b | 1730 | } |
7ac86265 JL |
1731 | } |
1732 | return NULL; | |
1733 | } | |
1734 | ||
b0dd25a8 | 1735 | /** |
196a5085 | 1736 | * __audit_getname - add a name to the list |
b0dd25a8 RD |
1737 | * @name: name to add |
1738 | * | |
1739 | * Add a name to the list of audit names for this context. | |
1740 | * Called from fs/namei.c:getname(). | |
1741 | */ | |
91a27b2a | 1742 | void __audit_getname(struct filename *name) |
1da177e4 | 1743 | { |
cdfb6b34 | 1744 | struct audit_context *context = audit_context(); |
5195d8e2 | 1745 | struct audit_names *n; |
1da177e4 | 1746 | |
55422d0b | 1747 | if (!context->in_syscall) |
1da177e4 | 1748 | return; |
91a27b2a | 1749 | |
78e2e802 | 1750 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
1751 | if (!n) |
1752 | return; | |
1753 | ||
1754 | n->name = name; | |
1755 | n->name_len = AUDIT_NAME_FULL; | |
adb5c247 | 1756 | name->aname = n; |
55422d0b | 1757 | name->refcnt++; |
5195d8e2 | 1758 | |
f7ad3c6b MS |
1759 | if (!context->pwd.dentry) |
1760 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
1761 | } |
1762 | ||
b0dd25a8 | 1763 | /** |
bfcec708 | 1764 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 1765 | * @name: name being audited |
481968f4 | 1766 | * @dentry: dentry being audited |
79f6530c | 1767 | * @flags: attributes for this particular entry |
b0dd25a8 | 1768 | */ |
adb5c247 | 1769 | void __audit_inode(struct filename *name, const struct dentry *dentry, |
79f6530c | 1770 | unsigned int flags) |
1da177e4 | 1771 | { |
cdfb6b34 | 1772 | struct audit_context *context = audit_context(); |
d6335d77 | 1773 | struct inode *inode = d_backing_inode(dentry); |
5195d8e2 | 1774 | struct audit_names *n; |
79f6530c | 1775 | bool parent = flags & AUDIT_INODE_PARENT; |
1da177e4 LT |
1776 | |
1777 | if (!context->in_syscall) | |
1778 | return; | |
5195d8e2 | 1779 | |
9cec9d68 JL |
1780 | if (!name) |
1781 | goto out_alloc; | |
1782 | ||
adb5c247 JL |
1783 | /* |
1784 | * If we have a pointer to an audit_names entry already, then we can | |
1785 | * just use it directly if the type is correct. | |
1786 | */ | |
1787 | n = name->aname; | |
1788 | if (n) { | |
1789 | if (parent) { | |
1790 | if (n->type == AUDIT_TYPE_PARENT || | |
1791 | n->type == AUDIT_TYPE_UNKNOWN) | |
1792 | goto out; | |
1793 | } else { | |
1794 | if (n->type != AUDIT_TYPE_PARENT) | |
1795 | goto out; | |
1796 | } | |
1797 | } | |
1798 | ||
5195d8e2 | 1799 | list_for_each_entry_reverse(n, &context->names_list, list) { |
57c59f58 PM |
1800 | if (n->ino) { |
1801 | /* valid inode number, use that for the comparison */ | |
1802 | if (n->ino != inode->i_ino || | |
1803 | n->dev != inode->i_sb->s_dev) | |
1804 | continue; | |
1805 | } else if (n->name) { | |
1806 | /* inode number has not been set, check the name */ | |
1807 | if (strcmp(n->name->name, name->name)) | |
1808 | continue; | |
1809 | } else | |
1810 | /* no inode and no name (?!) ... this is odd ... */ | |
bfcec708 JL |
1811 | continue; |
1812 | ||
1813 | /* match the correct record type */ | |
1814 | if (parent) { | |
1815 | if (n->type == AUDIT_TYPE_PARENT || | |
1816 | n->type == AUDIT_TYPE_UNKNOWN) | |
1817 | goto out; | |
1818 | } else { | |
1819 | if (n->type != AUDIT_TYPE_PARENT) | |
1820 | goto out; | |
1821 | } | |
1da177e4 | 1822 | } |
5195d8e2 | 1823 | |
9cec9d68 | 1824 | out_alloc: |
4a928436 PM |
1825 | /* unable to find an entry with both a matching name and type */ |
1826 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); | |
5195d8e2 EP |
1827 | if (!n) |
1828 | return; | |
fcf22d82 | 1829 | if (name) { |
fd3522fd | 1830 | n->name = name; |
55422d0b | 1831 | name->refcnt++; |
fcf22d82 | 1832 | } |
4a928436 | 1833 | |
5195d8e2 | 1834 | out: |
bfcec708 | 1835 | if (parent) { |
91a27b2a | 1836 | n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec708 | 1837 | n->type = AUDIT_TYPE_PARENT; |
79f6530c JL |
1838 | if (flags & AUDIT_INODE_HIDDEN) |
1839 | n->hidden = true; | |
bfcec708 JL |
1840 | } else { |
1841 | n->name_len = AUDIT_NAME_FULL; | |
1842 | n->type = AUDIT_TYPE_NORMAL; | |
1843 | } | |
74c3cbe3 | 1844 | handle_path(dentry); |
5195d8e2 | 1845 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
1846 | } |
1847 | ||
9f45f5bf AV |
1848 | void __audit_file(const struct file *file) |
1849 | { | |
1850 | __audit_inode(NULL, file->f_path.dentry, 0); | |
1851 | } | |
1852 | ||
73241ccc | 1853 | /** |
c43a25ab | 1854 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 1855 | * @parent: inode of dentry parent |
c43a25ab | 1856 | * @dentry: dentry being audited |
4fa6b5ec | 1857 | * @type: AUDIT_TYPE_* value that we're looking for |
73241ccc AG |
1858 | * |
1859 | * For syscalls that create or remove filesystem objects, audit_inode | |
1860 | * can only collect information for the filesystem object's parent. | |
1861 | * This call updates the audit context with the child's information. | |
1862 | * Syscalls that create a new filesystem object must be hooked after | |
1863 | * the object is created. Syscalls that remove a filesystem object | |
1864 | * must be hooked prior, in order to capture the target inode during | |
1865 | * unsuccessful attempts. | |
1866 | */ | |
d6335d77 | 1867 | void __audit_inode_child(struct inode *parent, |
4fa6b5ec JL |
1868 | const struct dentry *dentry, |
1869 | const unsigned char type) | |
73241ccc | 1870 | { |
cdfb6b34 | 1871 | struct audit_context *context = audit_context(); |
d6335d77 | 1872 | struct inode *inode = d_backing_inode(dentry); |
cccc6bba | 1873 | const char *dname = dentry->d_name.name; |
4fa6b5ec | 1874 | struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
42d5e376 RGB |
1875 | struct audit_entry *e; |
1876 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
1877 | int i; | |
73241ccc AG |
1878 | |
1879 | if (!context->in_syscall) | |
1880 | return; | |
1881 | ||
42d5e376 RGB |
1882 | rcu_read_lock(); |
1883 | if (!list_empty(list)) { | |
1884 | list_for_each_entry_rcu(e, list, list) { | |
1885 | for (i = 0; i < e->rule.field_count; i++) { | |
1886 | struct audit_field *f = &e->rule.fields[i]; | |
1887 | ||
1888 | if (f->type == AUDIT_FSTYPE) { | |
1889 | if (audit_comparator(parent->i_sb->s_magic, | |
1890 | f->op, f->val)) { | |
1891 | if (e->rule.action == AUDIT_NEVER) { | |
1892 | rcu_read_unlock(); | |
1893 | return; | |
1894 | } | |
1895 | } | |
1896 | } | |
1897 | } | |
1898 | } | |
1899 | } | |
1900 | rcu_read_unlock(); | |
1901 | ||
74c3cbe3 AV |
1902 | if (inode) |
1903 | handle_one(inode); | |
73241ccc | 1904 | |
4fa6b5ec | 1905 | /* look for a parent entry first */ |
5195d8e2 | 1906 | list_for_each_entry(n, &context->names_list, list) { |
57c59f58 PM |
1907 | if (!n->name || |
1908 | (n->type != AUDIT_TYPE_PARENT && | |
1909 | n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
1910 | continue; |
1911 | ||
57c59f58 PM |
1912 | if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev && |
1913 | !audit_compare_dname_path(dname, | |
1914 | n->name->name, n->name_len)) { | |
1915 | if (n->type == AUDIT_TYPE_UNKNOWN) | |
1916 | n->type = AUDIT_TYPE_PARENT; | |
4fa6b5ec JL |
1917 | found_parent = n; |
1918 | break; | |
f368c07d | 1919 | } |
5712e88f | 1920 | } |
73241ccc | 1921 | |
4fa6b5ec | 1922 | /* is there a matching child entry? */ |
5195d8e2 | 1923 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec | 1924 | /* can only match entries that have a name */ |
57c59f58 PM |
1925 | if (!n->name || |
1926 | (n->type != type && n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
1927 | continue; |
1928 | ||
91a27b2a JL |
1929 | if (!strcmp(dname, n->name->name) || |
1930 | !audit_compare_dname_path(dname, n->name->name, | |
4fa6b5ec JL |
1931 | found_parent ? |
1932 | found_parent->name_len : | |
e3d6b07b | 1933 | AUDIT_NAME_FULL)) { |
57c59f58 PM |
1934 | if (n->type == AUDIT_TYPE_UNKNOWN) |
1935 | n->type = type; | |
4fa6b5ec JL |
1936 | found_child = n; |
1937 | break; | |
5712e88f | 1938 | } |
ac9910ce | 1939 | } |
5712e88f | 1940 | |
5712e88f | 1941 | if (!found_parent) { |
4fa6b5ec JL |
1942 | /* create a new, "anonymous" parent record */ |
1943 | n = audit_alloc_name(context, AUDIT_TYPE_PARENT); | |
5195d8e2 | 1944 | if (!n) |
ac9910ce | 1945 | return; |
5195d8e2 | 1946 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 1947 | } |
5712e88f AG |
1948 | |
1949 | if (!found_child) { | |
4fa6b5ec JL |
1950 | found_child = audit_alloc_name(context, type); |
1951 | if (!found_child) | |
5712e88f | 1952 | return; |
5712e88f AG |
1953 | |
1954 | /* Re-use the name belonging to the slot for a matching parent | |
1955 | * directory. All names for this context are relinquished in | |
1956 | * audit_free_names() */ | |
1957 | if (found_parent) { | |
4fa6b5ec JL |
1958 | found_child->name = found_parent->name; |
1959 | found_child->name_len = AUDIT_NAME_FULL; | |
55422d0b | 1960 | found_child->name->refcnt++; |
5712e88f | 1961 | } |
5712e88f | 1962 | } |
57c59f58 | 1963 | |
4fa6b5ec JL |
1964 | if (inode) |
1965 | audit_copy_inode(found_child, dentry, inode); | |
1966 | else | |
84cb777e | 1967 | found_child->ino = AUDIT_INO_UNSET; |
3e2efce0 | 1968 | } |
50e437d5 | 1969 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 1970 | |
b0dd25a8 RD |
1971 | /** |
1972 | * auditsc_get_stamp - get local copies of audit_context values | |
1973 | * @ctx: audit_context for the task | |
2115bb25 | 1974 | * @t: timespec64 to store time recorded in the audit_context |
b0dd25a8 RD |
1975 | * @serial: serial value that is recorded in the audit_context |
1976 | * | |
1977 | * Also sets the context as auditable. | |
1978 | */ | |
48887e63 | 1979 | int auditsc_get_stamp(struct audit_context *ctx, |
2115bb25 | 1980 | struct timespec64 *t, unsigned int *serial) |
1da177e4 | 1981 | { |
48887e63 AV |
1982 | if (!ctx->in_syscall) |
1983 | return 0; | |
ce625a80 DW |
1984 | if (!ctx->serial) |
1985 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1986 | t->tv_sec = ctx->ctime.tv_sec; |
1987 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1988 | *serial = ctx->serial; | |
0590b933 AV |
1989 | if (!ctx->prio) { |
1990 | ctx->prio = 1; | |
1991 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
1992 | } | |
48887e63 | 1993 | return 1; |
1da177e4 LT |
1994 | } |
1995 | ||
4746ec5b EP |
1996 | /* global counter which is incremented every time something logs in */ |
1997 | static atomic_t session_id = ATOMIC_INIT(0); | |
1998 | ||
da0a6104 EP |
1999 | static int audit_set_loginuid_perm(kuid_t loginuid) |
2000 | { | |
da0a6104 EP |
2001 | /* if we are unset, we don't need privs */ |
2002 | if (!audit_loginuid_set(current)) | |
2003 | return 0; | |
21b85c31 EP |
2004 | /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/ |
2005 | if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE)) | |
2006 | return -EPERM; | |
83fa6bbe EP |
2007 | /* it is set, you need permission */ |
2008 | if (!capable(CAP_AUDIT_CONTROL)) | |
2009 | return -EPERM; | |
d040e5af EP |
2010 | /* reject if this is not an unset and we don't allow that */ |
2011 | if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid)) | |
2012 | return -EPERM; | |
83fa6bbe | 2013 | return 0; |
da0a6104 EP |
2014 | } |
2015 | ||
2016 | static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, | |
2017 | unsigned int oldsessionid, unsigned int sessionid, | |
2018 | int rc) | |
2019 | { | |
2020 | struct audit_buffer *ab; | |
5ee9a75c | 2021 | uid_t uid, oldloginuid, loginuid; |
db0a6fb5 | 2022 | struct tty_struct *tty; |
da0a6104 | 2023 | |
c2412d91 G |
2024 | if (!audit_enabled) |
2025 | return; | |
2026 | ||
76a658c2 RGB |
2027 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
2028 | if (!ab) | |
2029 | return; | |
2030 | ||
da0a6104 | 2031 | uid = from_kuid(&init_user_ns, task_uid(current)); |
5ee9a75c RGB |
2032 | oldloginuid = from_kuid(&init_user_ns, koldloginuid); |
2033 | loginuid = from_kuid(&init_user_ns, kloginuid), | |
db0a6fb5 | 2034 | tty = audit_get_tty(current); |
da0a6104 | 2035 | |
fa2bea2f | 2036 | audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid); |
ddfad8af | 2037 | audit_log_task_context(ab); |
db0a6fb5 RGB |
2038 | audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d", |
2039 | oldloginuid, loginuid, tty ? tty_name(tty) : "(none)", | |
2040 | oldsessionid, sessionid, !rc); | |
2041 | audit_put_tty(tty); | |
da0a6104 EP |
2042 | audit_log_end(ab); |
2043 | } | |
2044 | ||
b0dd25a8 | 2045 | /** |
0a300be6 | 2046 | * audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a8 RD |
2047 | * @loginuid: loginuid value |
2048 | * | |
2049 | * Returns 0. | |
2050 | * | |
2051 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2052 | */ | |
e1760bd5 | 2053 | int audit_set_loginuid(kuid_t loginuid) |
1da177e4 | 2054 | { |
0a300be6 | 2055 | struct task_struct *task = current; |
f0b75216 | 2056 | unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET; |
9175c9d2 | 2057 | kuid_t oldloginuid; |
da0a6104 | 2058 | int rc; |
41757106 | 2059 | |
da0a6104 EP |
2060 | oldloginuid = audit_get_loginuid(current); |
2061 | oldsessionid = audit_get_sessionid(current); | |
2062 | ||
2063 | rc = audit_set_loginuid_perm(loginuid); | |
2064 | if (rc) | |
2065 | goto out; | |
633b4545 | 2066 | |
81407c84 | 2067 | /* are we setting or clearing? */ |
833fc48d | 2068 | if (uid_valid(loginuid)) { |
4440e854 | 2069 | sessionid = (unsigned int)atomic_inc_return(&session_id); |
f0b75216 | 2070 | if (unlikely(sessionid == AUDIT_SID_UNSET)) |
833fc48d RGB |
2071 | sessionid = (unsigned int)atomic_inc_return(&session_id); |
2072 | } | |
bfef93a5 | 2073 | |
4746ec5b | 2074 | task->sessionid = sessionid; |
bfef93a5 | 2075 | task->loginuid = loginuid; |
da0a6104 EP |
2076 | out: |
2077 | audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); | |
2078 | return rc; | |
1da177e4 LT |
2079 | } |
2080 | ||
20ca73bc GW |
2081 | /** |
2082 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2083 | * @oflag: open flag | |
2084 | * @mode: mode bits | |
6b962559 | 2085 | * @attr: queue attributes |
20ca73bc | 2086 | * |
20ca73bc | 2087 | */ |
df0a4283 | 2088 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2089 | { |
cdfb6b34 | 2090 | struct audit_context *context = audit_context(); |
20ca73bc | 2091 | |
564f6993 AV |
2092 | if (attr) |
2093 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2094 | else | |
2095 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2096 | |
564f6993 AV |
2097 | context->mq_open.oflag = oflag; |
2098 | context->mq_open.mode = mode; | |
20ca73bc | 2099 | |
564f6993 | 2100 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2101 | } |
2102 | ||
2103 | /** | |
c32c8af4 | 2104 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2105 | * @mqdes: MQ descriptor |
2106 | * @msg_len: Message length | |
2107 | * @msg_prio: Message priority | |
c32c8af4 | 2108 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2109 | * |
20ca73bc | 2110 | */ |
c32c8af4 | 2111 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
b9047726 | 2112 | const struct timespec64 *abs_timeout) |
20ca73bc | 2113 | { |
cdfb6b34 | 2114 | struct audit_context *context = audit_context(); |
b9047726 | 2115 | struct timespec64 *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2116 | |
c32c8af4 | 2117 | if (abs_timeout) |
b9047726 | 2118 | memcpy(p, abs_timeout, sizeof(*p)); |
c32c8af4 | 2119 | else |
b9047726 | 2120 | memset(p, 0, sizeof(*p)); |
20ca73bc | 2121 | |
c32c8af4 AV |
2122 | context->mq_sendrecv.mqdes = mqdes; |
2123 | context->mq_sendrecv.msg_len = msg_len; | |
2124 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2125 | |
c32c8af4 | 2126 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2127 | } |
2128 | ||
2129 | /** | |
2130 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2131 | * @mqdes: MQ descriptor | |
6b962559 | 2132 | * @notification: Notification event |
20ca73bc | 2133 | * |
20ca73bc GW |
2134 | */ |
2135 | ||
20114f71 | 2136 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2137 | { |
cdfb6b34 | 2138 | struct audit_context *context = audit_context(); |
20ca73bc | 2139 | |
20114f71 AV |
2140 | if (notification) |
2141 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2142 | else | |
2143 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2144 | |
20114f71 AV |
2145 | context->mq_notify.mqdes = mqdes; |
2146 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2147 | } |
2148 | ||
2149 | /** | |
2150 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2151 | * @mqdes: MQ descriptor | |
2152 | * @mqstat: MQ flags | |
2153 | * | |
20ca73bc | 2154 | */ |
7392906e | 2155 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2156 | { |
cdfb6b34 | 2157 | struct audit_context *context = audit_context(); |
7392906e AV |
2158 | context->mq_getsetattr.mqdes = mqdes; |
2159 | context->mq_getsetattr.mqstat = *mqstat; | |
2160 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2161 | } |
2162 | ||
b0dd25a8 | 2163 | /** |
196a5085 | 2164 | * __audit_ipc_obj - record audit data for ipc object |
073115d6 SG |
2165 | * @ipcp: ipc permissions |
2166 | * | |
073115d6 | 2167 | */ |
a33e6751 | 2168 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2169 | { |
cdfb6b34 | 2170 | struct audit_context *context = audit_context(); |
a33e6751 AV |
2171 | context->ipc.uid = ipcp->uid; |
2172 | context->ipc.gid = ipcp->gid; | |
2173 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2174 | context->ipc.has_perm = 0; |
a33e6751 AV |
2175 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2176 | context->type = AUDIT_IPC; | |
073115d6 SG |
2177 | } |
2178 | ||
2179 | /** | |
196a5085 | 2180 | * __audit_ipc_set_perm - record audit data for new ipc permissions |
b0dd25a8 RD |
2181 | * @qbytes: msgq bytes |
2182 | * @uid: msgq user id | |
2183 | * @gid: msgq group id | |
2184 | * @mode: msgq mode (permissions) | |
2185 | * | |
e816f370 | 2186 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2187 | */ |
2570ebbd | 2188 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2189 | { |
cdfb6b34 | 2190 | struct audit_context *context = audit_context(); |
1da177e4 | 2191 | |
e816f370 AV |
2192 | context->ipc.qbytes = qbytes; |
2193 | context->ipc.perm_uid = uid; | |
2194 | context->ipc.perm_gid = gid; | |
2195 | context->ipc.perm_mode = mode; | |
2196 | context->ipc.has_perm = 1; | |
1da177e4 | 2197 | } |
c2f0c7c3 | 2198 | |
d9cfea91 | 2199 | void __audit_bprm(struct linux_binprm *bprm) |
473ae30b | 2200 | { |
cdfb6b34 | 2201 | struct audit_context *context = audit_context(); |
473ae30b | 2202 | |
d9cfea91 RGB |
2203 | context->type = AUDIT_EXECVE; |
2204 | context->execve.argc = bprm->argc; | |
473ae30b AV |
2205 | } |
2206 | ||
2207 | ||
b0dd25a8 | 2208 | /** |
196a5085 | 2209 | * __audit_socketcall - record audit data for sys_socketcall |
2950fa9d | 2210 | * @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a8 RD |
2211 | * @args: args array |
2212 | * | |
b0dd25a8 | 2213 | */ |
2950fa9d | 2214 | int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2215 | { |
cdfb6b34 | 2216 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2217 | |
2950fa9d CG |
2218 | if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) |
2219 | return -EINVAL; | |
f3298dc4 AV |
2220 | context->type = AUDIT_SOCKETCALL; |
2221 | context->socketcall.nargs = nargs; | |
2222 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
2950fa9d | 2223 | return 0; |
3ec3b2fb DW |
2224 | } |
2225 | ||
db349509 AV |
2226 | /** |
2227 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2228 | * @fd1: the first file descriptor | |
2229 | * @fd2: the second file descriptor | |
2230 | * | |
db349509 | 2231 | */ |
157cf649 | 2232 | void __audit_fd_pair(int fd1, int fd2) |
db349509 | 2233 | { |
cdfb6b34 | 2234 | struct audit_context *context = audit_context(); |
157cf649 AV |
2235 | context->fds[0] = fd1; |
2236 | context->fds[1] = fd2; | |
db349509 AV |
2237 | } |
2238 | ||
b0dd25a8 | 2239 | /** |
196a5085 | 2240 | * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto |
b0dd25a8 RD |
2241 | * @len: data length in user space |
2242 | * @a: data address in kernel space | |
2243 | * | |
2244 | * Returns 0 for success or NULL context or < 0 on error. | |
2245 | */ | |
07c49417 | 2246 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2247 | { |
cdfb6b34 | 2248 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2249 | |
4f6b434f AV |
2250 | if (!context->sockaddr) { |
2251 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2252 | if (!p) | |
2253 | return -ENOMEM; | |
2254 | context->sockaddr = p; | |
2255 | } | |
3ec3b2fb | 2256 | |
4f6b434f AV |
2257 | context->sockaddr_len = len; |
2258 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2259 | return 0; |
2260 | } | |
2261 | ||
a5cb013d AV |
2262 | void __audit_ptrace(struct task_struct *t) |
2263 | { | |
cdfb6b34 | 2264 | struct audit_context *context = audit_context(); |
a5cb013d | 2265 | |
fa2bea2f | 2266 | context->target_pid = task_tgid_nr(t); |
c2a7780e | 2267 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2268 | context->target_uid = task_uid(t); |
4746ec5b | 2269 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2270 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2271 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2272 | } |
2273 | ||
b0dd25a8 RD |
2274 | /** |
2275 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2276 | * @sig: signal value | |
2277 | * @t: task being signaled | |
2278 | * | |
2279 | * If the audit subsystem is being terminated, record the task (pid) | |
2280 | * and uid that is doing that. | |
2281 | */ | |
ab6434a1 | 2282 | int audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2283 | { |
e54dc243 | 2284 | struct audit_aux_data_pids *axp; |
cdfb6b34 | 2285 | struct audit_context *ctx = audit_context(); |
38f80590 | 2286 | kuid_t uid = current_uid(), auid, t_uid = task_uid(t); |
e1396065 | 2287 | |
ab6434a1 PM |
2288 | if (auditd_test_task(t) && |
2289 | (sig == SIGTERM || sig == SIGHUP || | |
2290 | sig == SIGUSR1 || sig == SIGUSR2)) { | |
cdfb6b34 | 2291 | audit_sig_pid = task_tgid_nr(current); |
38f80590 RGB |
2292 | auid = audit_get_loginuid(current); |
2293 | if (uid_valid(auid)) | |
2294 | audit_sig_uid = auid; | |
ab6434a1 PM |
2295 | else |
2296 | audit_sig_uid = uid; | |
cdfb6b34 | 2297 | security_task_getsecid(current, &audit_sig_sid); |
c2f0c7c3 | 2298 | } |
e54dc243 | 2299 | |
ab6434a1 PM |
2300 | if (!audit_signals || audit_dummy_context()) |
2301 | return 0; | |
2302 | ||
e54dc243 AG |
2303 | /* optimize the common case by putting first signal recipient directly |
2304 | * in audit_context */ | |
2305 | if (!ctx->target_pid) { | |
f1dc4867 | 2306 | ctx->target_pid = task_tgid_nr(t); |
c2a7780e | 2307 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2308 | ctx->target_uid = t_uid; |
4746ec5b | 2309 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2310 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2311 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2312 | return 0; |
2313 | } | |
2314 | ||
2315 | axp = (void *)ctx->aux_pids; | |
2316 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2317 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2318 | if (!axp) | |
2319 | return -ENOMEM; | |
2320 | ||
2321 | axp->d.type = AUDIT_OBJ_PID; | |
2322 | axp->d.next = ctx->aux_pids; | |
2323 | ctx->aux_pids = (void *)axp; | |
2324 | } | |
88ae704c | 2325 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 | 2326 | |
f1dc4867 | 2327 | axp->target_pid[axp->pid_count] = task_tgid_nr(t); |
c2a7780e | 2328 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2329 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2330 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2331 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2332 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2333 | axp->pid_count++; |
2334 | ||
2335 | return 0; | |
c2f0c7c3 | 2336 | } |
0a4ff8c2 | 2337 | |
3fc689e9 EP |
2338 | /** |
2339 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2340 | * @bprm: pointer to the bprm being processed |
2341 | * @new: the proposed new credentials | |
2342 | * @old: the old credentials | |
3fc689e9 EP |
2343 | * |
2344 | * Simply check if the proc already has the caps given by the file and if not | |
2345 | * store the priv escalation info for later auditing at the end of the syscall | |
2346 | * | |
3fc689e9 EP |
2347 | * -Eric |
2348 | */ | |
d84f4f99 DH |
2349 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2350 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2351 | { |
2352 | struct audit_aux_data_bprm_fcaps *ax; | |
cdfb6b34 | 2353 | struct audit_context *context = audit_context(); |
3fc689e9 | 2354 | struct cpu_vfs_cap_data vcaps; |
3fc689e9 EP |
2355 | |
2356 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2357 | if (!ax) | |
d84f4f99 | 2358 | return -ENOMEM; |
3fc689e9 EP |
2359 | |
2360 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2361 | ax->d.next = context->aux; | |
2362 | context->aux = (void *)ax; | |
2363 | ||
f4a4a8b1 | 2364 | get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps); |
3fc689e9 EP |
2365 | |
2366 | ax->fcap.permitted = vcaps.permitted; | |
2367 | ax->fcap.inheritable = vcaps.inheritable; | |
2368 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2369 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2370 | ||
d84f4f99 DH |
2371 | ax->old_pcap.permitted = old->cap_permitted; |
2372 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2373 | ax->old_pcap.effective = old->cap_effective; | |
7786f6b6 | 2374 | ax->old_pcap.ambient = old->cap_ambient; |
3fc689e9 | 2375 | |
d84f4f99 DH |
2376 | ax->new_pcap.permitted = new->cap_permitted; |
2377 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2378 | ax->new_pcap.effective = new->cap_effective; | |
7786f6b6 | 2379 | ax->new_pcap.ambient = new->cap_ambient; |
d84f4f99 | 2380 | return 0; |
3fc689e9 EP |
2381 | } |
2382 | ||
e68b75a0 EP |
2383 | /** |
2384 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2385 | * @new: the new credentials |
2386 | * @old: the old (current) credentials | |
e68b75a0 | 2387 | * |
da3dae54 | 2388 | * Record the arguments userspace sent to sys_capset for later printing by the |
e68b75a0 EP |
2389 | * audit system if applicable |
2390 | */ | |
ca24a23e | 2391 | void __audit_log_capset(const struct cred *new, const struct cred *old) |
e68b75a0 | 2392 | { |
cdfb6b34 | 2393 | struct audit_context *context = audit_context(); |
fa2bea2f | 2394 | context->capset.pid = task_tgid_nr(current); |
57f71a0a AV |
2395 | context->capset.cap.effective = new->cap_effective; |
2396 | context->capset.cap.inheritable = new->cap_effective; | |
2397 | context->capset.cap.permitted = new->cap_permitted; | |
7786f6b6 | 2398 | context->capset.cap.ambient = new->cap_ambient; |
57f71a0a | 2399 | context->type = AUDIT_CAPSET; |
e68b75a0 EP |
2400 | } |
2401 | ||
120a795d AV |
2402 | void __audit_mmap_fd(int fd, int flags) |
2403 | { | |
cdfb6b34 | 2404 | struct audit_context *context = audit_context(); |
120a795d AV |
2405 | context->mmap.fd = fd; |
2406 | context->mmap.flags = flags; | |
2407 | context->type = AUDIT_MMAP; | |
2408 | } | |
2409 | ||
ca86cad7 RGB |
2410 | void __audit_log_kern_module(char *name) |
2411 | { | |
cdfb6b34 | 2412 | struct audit_context *context = audit_context(); |
ca86cad7 RGB |
2413 | |
2414 | context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL); | |
2415 | strcpy(context->module.name, name); | |
2416 | context->type = AUDIT_KERN_MODULE; | |
2417 | } | |
2418 | ||
de8cd83e SG |
2419 | void __audit_fanotify(unsigned int response) |
2420 | { | |
cdfb6b34 | 2421 | audit_log(audit_context(), GFP_KERNEL, |
de8cd83e SG |
2422 | AUDIT_FANOTIFY, "resp=%u", response); |
2423 | } | |
2424 | ||
7b9205bd | 2425 | static void audit_log_task(struct audit_buffer *ab) |
85e7bac3 | 2426 | { |
cca080d9 EB |
2427 | kuid_t auid, uid; |
2428 | kgid_t gid; | |
85e7bac3 | 2429 | unsigned int sessionid; |
9eab339b | 2430 | char comm[sizeof(current->comm)]; |
85e7bac3 EP |
2431 | |
2432 | auid = audit_get_loginuid(current); | |
2433 | sessionid = audit_get_sessionid(current); | |
2434 | current_uid_gid(&uid, &gid); | |
2435 | ||
2436 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2437 | from_kuid(&init_user_ns, auid), |
2438 | from_kuid(&init_user_ns, uid), | |
2439 | from_kgid(&init_user_ns, gid), | |
2440 | sessionid); | |
85e7bac3 | 2441 | audit_log_task_context(ab); |
fa2bea2f | 2442 | audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); |
9eab339b | 2443 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); |
4766b199 | 2444 | audit_log_d_path_exe(ab, current->mm); |
7b9205bd KC |
2445 | } |
2446 | ||
0a4ff8c2 SG |
2447 | /** |
2448 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2449 | * @signr: signal value |
0a4ff8c2 SG |
2450 | * |
2451 | * If a process ends with a core dump, something fishy is going on and we | |
2452 | * should record the event for investigation. | |
2453 | */ | |
2454 | void audit_core_dumps(long signr) | |
2455 | { | |
2456 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2457 | |
2458 | if (!audit_enabled) | |
2459 | return; | |
2460 | ||
2461 | if (signr == SIGQUIT) /* don't care for those */ | |
2462 | return; | |
2463 | ||
2464 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
0644ec0c KC |
2465 | if (unlikely(!ab)) |
2466 | return; | |
61c0ee87 | 2467 | audit_log_task(ab); |
89670aff | 2468 | audit_log_format(ab, " sig=%ld res=1", signr); |
85e7bac3 EP |
2469 | audit_log_end(ab); |
2470 | } | |
0a4ff8c2 | 2471 | |
326bee02 TH |
2472 | /** |
2473 | * audit_seccomp - record information about a seccomp action | |
2474 | * @syscall: syscall number | |
2475 | * @signr: signal value | |
2476 | * @code: the seccomp action | |
2477 | * | |
2478 | * Record the information associated with a seccomp action. Event filtering for | |
2479 | * seccomp actions that are not to be logged is done in seccomp_log(). | |
2480 | * Therefore, this function forces auditing independent of the audit_enabled | |
2481 | * and dummy context state because seccomp actions should be logged even when | |
2482 | * audit is not in use. | |
2483 | */ | |
2484 | void audit_seccomp(unsigned long syscall, long signr, int code) | |
85e7bac3 EP |
2485 | { |
2486 | struct audit_buffer *ab; | |
2487 | ||
7b9205bd KC |
2488 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP); |
2489 | if (unlikely(!ab)) | |
2490 | return; | |
2491 | audit_log_task(ab); | |
84db564a | 2492 | audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x", |
efbc0fbf AL |
2493 | signr, syscall_get_arch(), syscall, |
2494 | in_compat_syscall(), KSTK_EIP(current), code); | |
0a4ff8c2 SG |
2495 | audit_log_end(ab); |
2496 | } | |
916d7576 | 2497 | |
ea6eca77 TH |
2498 | void audit_seccomp_actions_logged(const char *names, const char *old_names, |
2499 | int res) | |
2500 | { | |
2501 | struct audit_buffer *ab; | |
2502 | ||
2503 | if (!audit_enabled) | |
2504 | return; | |
2505 | ||
8982a1fb | 2506 | ab = audit_log_start(audit_context(), GFP_KERNEL, |
ea6eca77 TH |
2507 | AUDIT_CONFIG_CHANGE); |
2508 | if (unlikely(!ab)) | |
2509 | return; | |
2510 | ||
2511 | audit_log_format(ab, "op=seccomp-logging"); | |
2512 | audit_log_format(ab, " actions=%s", names); | |
2513 | audit_log_format(ab, " old-actions=%s", old_names); | |
2514 | audit_log_format(ab, " res=%d", res); | |
2515 | audit_log_end(ab); | |
2516 | } | |
2517 | ||
916d7576 AV |
2518 | struct list_head *audit_killed_trees(void) |
2519 | { | |
cdfb6b34 | 2520 | struct audit_context *ctx = audit_context(); |
916d7576 AV |
2521 | if (likely(!ctx || !ctx->in_syscall)) |
2522 | return NULL; | |
2523 | return &ctx->killed_trees; | |
2524 | } |