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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> |
8e6cf365 | 78 | #include <uapi/linux/netfilter/nf_tables.h> |
1da177e4 | 79 | |
fe7752ba | 80 | #include "audit.h" |
1da177e4 | 81 | |
d7e7528b EP |
82 | /* flags stating the success for a syscall */ |
83 | #define AUDITSC_INVALID 0 | |
84 | #define AUDITSC_SUCCESS 1 | |
85 | #define AUDITSC_FAILURE 2 | |
86 | ||
43761473 PM |
87 | /* no execve audit message should be longer than this (userspace limits), |
88 | * see the note near the top of audit_log_execve_info() about this value */ | |
de6bbd1d EP |
89 | #define MAX_EXECVE_AUDIT_LEN 7500 |
90 | ||
3f1c8250 WR |
91 | /* max length to print of cmdline/proctitle value during audit */ |
92 | #define MAX_PROCTITLE_AUDIT_LEN 128 | |
93 | ||
471a5c7c AV |
94 | /* number of audit rules */ |
95 | int audit_n_rules; | |
96 | ||
e54dc243 AG |
97 | /* determines whether we collect data for signals sent */ |
98 | int audit_signals; | |
99 | ||
1da177e4 LT |
100 | struct audit_aux_data { |
101 | struct audit_aux_data *next; | |
102 | int type; | |
103 | }; | |
104 | ||
e54dc243 AG |
105 | /* Number of target pids per aux struct. */ |
106 | #define AUDIT_AUX_PIDS 16 | |
107 | ||
e54dc243 AG |
108 | struct audit_aux_data_pids { |
109 | struct audit_aux_data d; | |
110 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
e1760bd5 | 111 | kuid_t target_auid[AUDIT_AUX_PIDS]; |
cca080d9 | 112 | kuid_t target_uid[AUDIT_AUX_PIDS]; |
4746ec5b | 113 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
36fd78ba | 114 | struct lsmblob target_lsm[AUDIT_AUX_PIDS]; |
c2a7780e | 115 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
116 | int pid_count; |
117 | }; | |
118 | ||
3fc689e9 EP |
119 | struct audit_aux_data_bprm_fcaps { |
120 | struct audit_aux_data d; | |
121 | struct audit_cap_data fcap; | |
122 | unsigned int fcap_ver; | |
123 | struct audit_cap_data old_pcap; | |
124 | struct audit_cap_data new_pcap; | |
125 | }; | |
126 | ||
74c3cbe3 AV |
127 | struct audit_tree_refs { |
128 | struct audit_tree_refs *next; | |
129 | struct audit_chunk *c[31]; | |
130 | }; | |
131 | ||
c4dad0aa RGB |
132 | struct audit_nfcfgop_tab { |
133 | enum audit_nfcfgop op; | |
134 | const char *s; | |
135 | }; | |
136 | ||
db9ff6ec | 137 | static const struct audit_nfcfgop_tab audit_nfcfgs[] = { |
8e6cf365 RGB |
138 | { AUDIT_XT_OP_REGISTER, "xt_register" }, |
139 | { AUDIT_XT_OP_REPLACE, "xt_replace" }, | |
140 | { AUDIT_XT_OP_UNREGISTER, "xt_unregister" }, | |
141 | { AUDIT_NFT_OP_TABLE_REGISTER, "nft_register_table" }, | |
142 | { AUDIT_NFT_OP_TABLE_UNREGISTER, "nft_unregister_table" }, | |
143 | { AUDIT_NFT_OP_CHAIN_REGISTER, "nft_register_chain" }, | |
144 | { AUDIT_NFT_OP_CHAIN_UNREGISTER, "nft_unregister_chain" }, | |
145 | { AUDIT_NFT_OP_RULE_REGISTER, "nft_register_rule" }, | |
146 | { AUDIT_NFT_OP_RULE_UNREGISTER, "nft_unregister_rule" }, | |
147 | { AUDIT_NFT_OP_SET_REGISTER, "nft_register_set" }, | |
148 | { AUDIT_NFT_OP_SET_UNREGISTER, "nft_unregister_set" }, | |
149 | { AUDIT_NFT_OP_SETELEM_REGISTER, "nft_register_setelem" }, | |
150 | { AUDIT_NFT_OP_SETELEM_UNREGISTER, "nft_unregister_setelem" }, | |
151 | { AUDIT_NFT_OP_GEN_REGISTER, "nft_register_gen" }, | |
152 | { AUDIT_NFT_OP_OBJ_REGISTER, "nft_register_obj" }, | |
153 | { AUDIT_NFT_OP_OBJ_UNREGISTER, "nft_unregister_obj" }, | |
154 | { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" }, | |
155 | { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" }, | |
156 | { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" }, | |
157 | { AUDIT_NFT_OP_INVALID, "nft_invalid" }, | |
c4dad0aa RGB |
158 | }; |
159 | ||
55669bfa AV |
160 | static int audit_match_perm(struct audit_context *ctx, int mask) |
161 | { | |
c4bacefb | 162 | unsigned n; |
254c8b96 | 163 | |
1a61c88d | 164 | if (unlikely(!ctx)) |
165 | return 0; | |
c4bacefb | 166 | n = ctx->major; |
dbda4c0b | 167 | |
55669bfa AV |
168 | switch (audit_classify_syscall(ctx->arch, n)) { |
169 | case 0: /* native */ | |
170 | if ((mask & AUDIT_PERM_WRITE) && | |
171 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
172 | return 1; | |
173 | if ((mask & AUDIT_PERM_READ) && | |
174 | audit_match_class(AUDIT_CLASS_READ, n)) | |
175 | return 1; | |
176 | if ((mask & AUDIT_PERM_ATTR) && | |
177 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
178 | return 1; | |
179 | return 0; | |
180 | case 1: /* 32bit on biarch */ | |
181 | if ((mask & AUDIT_PERM_WRITE) && | |
182 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
183 | return 1; | |
184 | if ((mask & AUDIT_PERM_READ) && | |
185 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
186 | return 1; | |
187 | if ((mask & AUDIT_PERM_ATTR) && | |
188 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
189 | return 1; | |
190 | return 0; | |
191 | case 2: /* open */ | |
192 | return mask & ACC_MODE(ctx->argv[1]); | |
193 | case 3: /* openat */ | |
194 | return mask & ACC_MODE(ctx->argv[2]); | |
195 | case 4: /* socketcall */ | |
196 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
197 | case 5: /* execve */ | |
198 | return mask & AUDIT_PERM_EXEC; | |
199 | default: | |
200 | return 0; | |
201 | } | |
202 | } | |
203 | ||
5ef30ee5 | 204 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 205 | { |
5195d8e2 | 206 | struct audit_names *n; |
5ef30ee5 | 207 | umode_t mode = (umode_t)val; |
1a61c88d | 208 | |
209 | if (unlikely(!ctx)) | |
210 | return 0; | |
211 | ||
5195d8e2 | 212 | list_for_each_entry(n, &ctx->names_list, list) { |
84cb777e | 213 | if ((n->ino != AUDIT_INO_UNSET) && |
5195d8e2 | 214 | ((n->mode & S_IFMT) == mode)) |
5ef30ee5 EP |
215 | return 1; |
216 | } | |
5195d8e2 | 217 | |
5ef30ee5 | 218 | return 0; |
8b67dca9 AV |
219 | } |
220 | ||
74c3cbe3 AV |
221 | /* |
222 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
223 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
224 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
225 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
226 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
227 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
228 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
229 | */ | |
230 | ||
679173b7 EP |
231 | static void audit_set_auditable(struct audit_context *ctx) |
232 | { | |
233 | if (!ctx->prio) { | |
234 | ctx->prio = 1; | |
619ed58a | 235 | ctx->current_state = AUDIT_STATE_RECORD; |
679173b7 EP |
236 | } |
237 | } | |
238 | ||
74c3cbe3 AV |
239 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
240 | { | |
241 | struct audit_tree_refs *p = ctx->trees; | |
242 | int left = ctx->tree_count; | |
254c8b96 | 243 | |
74c3cbe3 AV |
244 | if (likely(left)) { |
245 | p->c[--left] = chunk; | |
246 | ctx->tree_count = left; | |
247 | return 1; | |
248 | } | |
249 | if (!p) | |
250 | return 0; | |
251 | p = p->next; | |
252 | if (p) { | |
253 | p->c[30] = chunk; | |
254 | ctx->trees = p; | |
255 | ctx->tree_count = 30; | |
256 | return 1; | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int grow_tree_refs(struct audit_context *ctx) | |
262 | { | |
263 | struct audit_tree_refs *p = ctx->trees; | |
254c8b96 | 264 | |
74c3cbe3 AV |
265 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); |
266 | if (!ctx->trees) { | |
267 | ctx->trees = p; | |
268 | return 0; | |
269 | } | |
270 | if (p) | |
271 | p->next = ctx->trees; | |
272 | else | |
273 | ctx->first_trees = ctx->trees; | |
274 | ctx->tree_count = 31; | |
275 | return 1; | |
276 | } | |
74c3cbe3 AV |
277 | |
278 | static void unroll_tree_refs(struct audit_context *ctx, | |
279 | struct audit_tree_refs *p, int count) | |
280 | { | |
74c3cbe3 AV |
281 | struct audit_tree_refs *q; |
282 | int n; | |
254c8b96 | 283 | |
74c3cbe3 AV |
284 | if (!p) { |
285 | /* we started with empty chain */ | |
286 | p = ctx->first_trees; | |
287 | count = 31; | |
288 | /* if the very first allocation has failed, nothing to do */ | |
289 | if (!p) | |
290 | return; | |
291 | } | |
292 | n = count; | |
293 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
294 | while (n--) { | |
295 | audit_put_chunk(q->c[n]); | |
296 | q->c[n] = NULL; | |
297 | } | |
298 | } | |
299 | while (n-- > ctx->tree_count) { | |
300 | audit_put_chunk(q->c[n]); | |
301 | q->c[n] = NULL; | |
302 | } | |
303 | ctx->trees = p; | |
304 | ctx->tree_count = count; | |
74c3cbe3 AV |
305 | } |
306 | ||
307 | static void free_tree_refs(struct audit_context *ctx) | |
308 | { | |
309 | struct audit_tree_refs *p, *q; | |
254c8b96 | 310 | |
74c3cbe3 AV |
311 | for (p = ctx->first_trees; p; p = q) { |
312 | q = p->next; | |
313 | kfree(p); | |
314 | } | |
315 | } | |
316 | ||
317 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
318 | { | |
74c3cbe3 AV |
319 | struct audit_tree_refs *p; |
320 | int n; | |
254c8b96 | 321 | |
74c3cbe3 AV |
322 | if (!tree) |
323 | return 0; | |
324 | /* full ones */ | |
325 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
326 | for (n = 0; n < 31; n++) | |
327 | if (audit_tree_match(p->c[n], tree)) | |
328 | return 1; | |
329 | } | |
330 | /* partial */ | |
331 | if (p) { | |
332 | for (n = ctx->tree_count; n < 31; n++) | |
333 | if (audit_tree_match(p->c[n], tree)) | |
334 | return 1; | |
335 | } | |
74c3cbe3 AV |
336 | return 0; |
337 | } | |
338 | ||
ca57ec0f EB |
339 | static int audit_compare_uid(kuid_t uid, |
340 | struct audit_names *name, | |
341 | struct audit_field *f, | |
342 | struct audit_context *ctx) | |
b34b0393 EP |
343 | { |
344 | struct audit_names *n; | |
b34b0393 | 345 | int rc; |
6ddb5680 | 346 | |
b34b0393 | 347 | if (name) { |
ca57ec0f | 348 | rc = audit_uid_comparator(uid, f->op, name->uid); |
b34b0393 EP |
349 | if (rc) |
350 | return rc; | |
351 | } | |
6ddb5680 | 352 | |
b34b0393 EP |
353 | if (ctx) { |
354 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f EB |
355 | rc = audit_uid_comparator(uid, f->op, n->uid); |
356 | if (rc) | |
357 | return rc; | |
358 | } | |
359 | } | |
360 | return 0; | |
361 | } | |
b34b0393 | 362 | |
ca57ec0f EB |
363 | static int audit_compare_gid(kgid_t gid, |
364 | struct audit_names *name, | |
365 | struct audit_field *f, | |
366 | struct audit_context *ctx) | |
367 | { | |
368 | struct audit_names *n; | |
369 | int rc; | |
6ddb5680 | 370 | |
ca57ec0f EB |
371 | if (name) { |
372 | rc = audit_gid_comparator(gid, f->op, name->gid); | |
373 | if (rc) | |
374 | return rc; | |
375 | } | |
6ddb5680 | 376 | |
ca57ec0f EB |
377 | if (ctx) { |
378 | list_for_each_entry(n, &ctx->names_list, list) { | |
379 | rc = audit_gid_comparator(gid, f->op, n->gid); | |
b34b0393 EP |
380 | if (rc) |
381 | return rc; | |
382 | } | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
02d86a56 EP |
387 | static int audit_field_compare(struct task_struct *tsk, |
388 | const struct cred *cred, | |
389 | struct audit_field *f, | |
390 | struct audit_context *ctx, | |
391 | struct audit_names *name) | |
392 | { | |
02d86a56 | 393 | switch (f->val) { |
4a6633ed | 394 | /* process to file object comparisons */ |
02d86a56 | 395 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
ca57ec0f | 396 | return audit_compare_uid(cred->uid, name, f, ctx); |
c9fe685f | 397 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
ca57ec0f | 398 | return audit_compare_gid(cred->gid, name, f, ctx); |
4a6633ed | 399 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
ca57ec0f | 400 | return audit_compare_uid(cred->euid, name, f, ctx); |
4a6633ed | 401 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
ca57ec0f | 402 | return audit_compare_gid(cred->egid, name, f, ctx); |
4a6633ed | 403 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
38f80590 | 404 | return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx); |
4a6633ed | 405 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
ca57ec0f | 406 | return audit_compare_uid(cred->suid, name, f, ctx); |
4a6633ed | 407 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
ca57ec0f | 408 | return audit_compare_gid(cred->sgid, name, f, ctx); |
4a6633ed | 409 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
ca57ec0f | 410 | return audit_compare_uid(cred->fsuid, name, f, ctx); |
4a6633ed | 411 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
ca57ec0f | 412 | return audit_compare_gid(cred->fsgid, name, f, ctx); |
10d68360 PM |
413 | /* uid comparisons */ |
414 | case AUDIT_COMPARE_UID_TO_AUID: | |
38f80590 RGB |
415 | return audit_uid_comparator(cred->uid, f->op, |
416 | audit_get_loginuid(tsk)); | |
10d68360 | 417 | case AUDIT_COMPARE_UID_TO_EUID: |
ca57ec0f | 418 | return audit_uid_comparator(cred->uid, f->op, cred->euid); |
10d68360 | 419 | case AUDIT_COMPARE_UID_TO_SUID: |
ca57ec0f | 420 | return audit_uid_comparator(cred->uid, f->op, cred->suid); |
10d68360 | 421 | case AUDIT_COMPARE_UID_TO_FSUID: |
ca57ec0f | 422 | return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
10d68360 PM |
423 | /* auid comparisons */ |
424 | case AUDIT_COMPARE_AUID_TO_EUID: | |
38f80590 RGB |
425 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
426 | cred->euid); | |
10d68360 | 427 | case AUDIT_COMPARE_AUID_TO_SUID: |
38f80590 RGB |
428 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
429 | cred->suid); | |
10d68360 | 430 | case AUDIT_COMPARE_AUID_TO_FSUID: |
38f80590 RGB |
431 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
432 | cred->fsuid); | |
10d68360 PM |
433 | /* euid comparisons */ |
434 | case AUDIT_COMPARE_EUID_TO_SUID: | |
ca57ec0f | 435 | return audit_uid_comparator(cred->euid, f->op, cred->suid); |
10d68360 | 436 | case AUDIT_COMPARE_EUID_TO_FSUID: |
ca57ec0f | 437 | return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
10d68360 PM |
438 | /* suid comparisons */ |
439 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
ca57ec0f | 440 | return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
10d68360 PM |
441 | /* gid comparisons */ |
442 | case AUDIT_COMPARE_GID_TO_EGID: | |
ca57ec0f | 443 | return audit_gid_comparator(cred->gid, f->op, cred->egid); |
10d68360 | 444 | case AUDIT_COMPARE_GID_TO_SGID: |
ca57ec0f | 445 | return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
10d68360 | 446 | case AUDIT_COMPARE_GID_TO_FSGID: |
ca57ec0f | 447 | return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
10d68360 PM |
448 | /* egid comparisons */ |
449 | case AUDIT_COMPARE_EGID_TO_SGID: | |
ca57ec0f | 450 | return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
10d68360 | 451 | case AUDIT_COMPARE_EGID_TO_FSGID: |
ca57ec0f | 452 | return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
10d68360 PM |
453 | /* sgid comparison */ |
454 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
ca57ec0f | 455 | return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
02d86a56 EP |
456 | default: |
457 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
458 | return 0; | |
459 | } | |
460 | return 0; | |
461 | } | |
462 | ||
f368c07d | 463 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 464 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
465 | * otherwise. |
466 | * | |
467 | * If task_creation is true, this is an explicit indication that we are | |
468 | * filtering a task rule at task creation time. This and tsk == current are | |
469 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
470 | */ | |
1da177e4 | 471 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 472 | struct audit_krule *rule, |
1da177e4 | 473 | struct audit_context *ctx, |
f368c07d | 474 | struct audit_names *name, |
f5629883 TJ |
475 | enum audit_state *state, |
476 | bool task_creation) | |
1da177e4 | 477 | { |
f5629883 | 478 | const struct cred *cred; |
5195d8e2 | 479 | int i, need_sid = 1; |
85ff5379 | 480 | struct lsmblob blob = { }; |
8fae4770 | 481 | unsigned int sessionid; |
3dc7e315 | 482 | |
f5629883 TJ |
483 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
484 | ||
1da177e4 | 485 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 486 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 487 | struct audit_names *n; |
1da177e4 | 488 | int result = 0; |
f1dc4867 | 489 | pid_t pid; |
1da177e4 | 490 | |
93315ed6 | 491 | switch (f->type) { |
1da177e4 | 492 | case AUDIT_PID: |
fa2bea2f | 493 | pid = task_tgid_nr(tsk); |
f1dc4867 | 494 | result = audit_comparator(pid, f->op, f->val); |
1da177e4 | 495 | break; |
3c66251e | 496 | case AUDIT_PPID: |
419c58f1 AV |
497 | if (ctx) { |
498 | if (!ctx->ppid) | |
c92cdeb4 | 499 | ctx->ppid = task_ppid_nr(tsk); |
3c66251e | 500 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 501 | } |
3c66251e | 502 | break; |
34d99af5 RGB |
503 | case AUDIT_EXE: |
504 | result = audit_exe_compare(tsk, rule->exe); | |
23bcc480 OM |
505 | if (f->op == Audit_not_equal) |
506 | result = !result; | |
34d99af5 | 507 | break; |
1da177e4 | 508 | case AUDIT_UID: |
ca57ec0f | 509 | result = audit_uid_comparator(cred->uid, f->op, f->uid); |
1da177e4 LT |
510 | break; |
511 | case AUDIT_EUID: | |
ca57ec0f | 512 | result = audit_uid_comparator(cred->euid, f->op, f->uid); |
1da177e4 LT |
513 | break; |
514 | case AUDIT_SUID: | |
ca57ec0f | 515 | result = audit_uid_comparator(cred->suid, f->op, f->uid); |
1da177e4 LT |
516 | break; |
517 | case AUDIT_FSUID: | |
ca57ec0f | 518 | result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
1da177e4 LT |
519 | break; |
520 | case AUDIT_GID: | |
ca57ec0f | 521 | result = audit_gid_comparator(cred->gid, f->op, f->gid); |
37eebe39 MI |
522 | if (f->op == Audit_equal) { |
523 | if (!result) | |
af85d177 | 524 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
525 | } else if (f->op == Audit_not_equal) { |
526 | if (result) | |
af85d177 | 527 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 528 | } |
1da177e4 LT |
529 | break; |
530 | case AUDIT_EGID: | |
ca57ec0f | 531 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39 MI |
532 | if (f->op == Audit_equal) { |
533 | if (!result) | |
af85d177 | 534 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
535 | } else if (f->op == Audit_not_equal) { |
536 | if (result) | |
af85d177 | 537 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 538 | } |
1da177e4 LT |
539 | break; |
540 | case AUDIT_SGID: | |
ca57ec0f | 541 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
542 | break; |
543 | case AUDIT_FSGID: | |
ca57ec0f | 544 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 | 545 | break; |
8fae4770 | 546 | case AUDIT_SESSIONID: |
5b713886 | 547 | sessionid = audit_get_sessionid(tsk); |
8fae4770 RGB |
548 | result = audit_comparator(sessionid, f->op, f->val); |
549 | break; | |
1da177e4 | 550 | case AUDIT_PERS: |
93315ed6 | 551 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 552 | break; |
2fd6f58b | 553 | case AUDIT_ARCH: |
9f8dbe9c | 554 | if (ctx) |
93315ed6 | 555 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 556 | break; |
1da177e4 LT |
557 | |
558 | case AUDIT_EXIT: | |
ba59eae7 | 559 | if (ctx && ctx->return_valid != AUDITSC_INVALID) |
93315ed6 | 560 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
561 | break; |
562 | case AUDIT_SUCCESS: | |
ba59eae7 | 563 | if (ctx && ctx->return_valid != AUDITSC_INVALID) { |
93315ed6 AG |
564 | if (f->val) |
565 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 566 | else |
93315ed6 | 567 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 568 | } |
1da177e4 LT |
569 | break; |
570 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
571 | if (name) { |
572 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
573 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
574 | ++result; | |
575 | } else if (ctx) { | |
5195d8e2 | 576 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
577 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
578 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
579 | ++result; |
580 | break; | |
581 | } | |
582 | } | |
583 | } | |
584 | break; | |
585 | case AUDIT_DEVMINOR: | |
16c174bd EP |
586 | if (name) { |
587 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
588 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
589 | ++result; | |
590 | } else if (ctx) { | |
5195d8e2 | 591 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
592 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
593 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
594 | ++result; |
595 | break; | |
596 | } | |
597 | } | |
598 | } | |
599 | break; | |
600 | case AUDIT_INODE: | |
f368c07d | 601 | if (name) |
db510fc5 | 602 | result = audit_comparator(name->ino, f->op, f->val); |
f368c07d | 603 | else if (ctx) { |
5195d8e2 EP |
604 | list_for_each_entry(n, &ctx->names_list, list) { |
605 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
606 | ++result; |
607 | break; | |
608 | } | |
609 | } | |
610 | } | |
611 | break; | |
efaffd6e EP |
612 | case AUDIT_OBJ_UID: |
613 | if (name) { | |
ca57ec0f | 614 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
615 | } else if (ctx) { |
616 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 617 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
618 | ++result; |
619 | break; | |
620 | } | |
621 | } | |
622 | } | |
623 | break; | |
54d3218b EP |
624 | case AUDIT_OBJ_GID: |
625 | if (name) { | |
ca57ec0f | 626 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
627 | } else if (ctx) { |
628 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 629 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
630 | ++result; |
631 | break; | |
632 | } | |
633 | } | |
634 | } | |
635 | break; | |
f368c07d | 636 | case AUDIT_WATCH: |
0223fad3 RGB |
637 | if (name) { |
638 | result = audit_watch_compare(rule->watch, | |
639 | name->ino, | |
640 | name->dev); | |
641 | if (f->op == Audit_not_equal) | |
642 | result = !result; | |
643 | } | |
f368c07d | 644 | break; |
74c3cbe3 | 645 | case AUDIT_DIR: |
0223fad3 | 646 | if (ctx) { |
74c3cbe3 | 647 | result = match_tree_refs(ctx, rule->tree); |
0223fad3 RGB |
648 | if (f->op == Audit_not_equal) |
649 | result = !result; | |
650 | } | |
74c3cbe3 | 651 | break; |
1da177e4 | 652 | case AUDIT_LOGINUID: |
38f80590 RGB |
653 | result = audit_uid_comparator(audit_get_loginuid(tsk), |
654 | f->op, f->uid); | |
1da177e4 | 655 | break; |
780a7654 EB |
656 | case AUDIT_LOGINUID_SET: |
657 | result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); | |
658 | break; | |
bf361231 | 659 | case AUDIT_SADDR_FAM: |
6e3ee990 | 660 | if (ctx && ctx->sockaddr) |
bf361231 RGB |
661 | result = audit_comparator(ctx->sockaddr->ss_family, |
662 | f->op, f->val); | |
663 | break; | |
3a6b9f85 DG |
664 | case AUDIT_SUBJ_USER: |
665 | case AUDIT_SUBJ_ROLE: | |
666 | case AUDIT_SUBJ_TYPE: | |
667 | case AUDIT_SUBJ_SEN: | |
668 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
669 | /* NOTE: this may return negative values indicating |
670 | a temporary error. We simply treat this as a | |
671 | match for now to avoid losing information that | |
672 | may be wanted. An error message will also be | |
673 | logged upon error */ | |
f17b27a2 | 674 | if (f->lsm_isset) { |
2ad312d2 | 675 | if (need_sid) { |
e209474e | 676 | security_task_getsecid_subj(tsk, &blob); |
2ad312d2 SG |
677 | need_sid = 0; |
678 | } | |
eb182194 CS |
679 | result = security_audit_rule_match(&blob, |
680 | f->type, | |
90462a5b | 681 | f->op, |
f17b27a2 | 682 | f->lsm_rules); |
2ad312d2 | 683 | } |
3dc7e315 | 684 | break; |
6e5a2d1d DG |
685 | case AUDIT_OBJ_USER: |
686 | case AUDIT_OBJ_ROLE: | |
687 | case AUDIT_OBJ_TYPE: | |
688 | case AUDIT_OBJ_LEV_LOW: | |
689 | case AUDIT_OBJ_LEV_HIGH: | |
690 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
691 | also applies here */ | |
f17b27a2 | 692 | if (f->lsm_isset) { |
6e5a2d1d DG |
693 | /* Find files that match */ |
694 | if (name) { | |
d7a96f3a | 695 | result = security_audit_rule_match( |
eb182194 | 696 | &blob, |
90462a5b RGB |
697 | f->type, |
698 | f->op, | |
f17b27a2 | 699 | f->lsm_rules); |
6e5a2d1d | 700 | } else if (ctx) { |
5195d8e2 | 701 | list_for_each_entry(n, &ctx->names_list, list) { |
90462a5b | 702 | if (security_audit_rule_match( |
eb182194 | 703 | &blob, |
90462a5b RGB |
704 | f->type, |
705 | f->op, | |
f17b27a2 | 706 | f->lsm_rules)) { |
6e5a2d1d DG |
707 | ++result; |
708 | break; | |
709 | } | |
710 | } | |
711 | } | |
712 | /* Find ipc objects that match */ | |
a33e6751 AV |
713 | if (!ctx || ctx->type != AUDIT_IPC) |
714 | break; | |
558fd844 | 715 | if (security_audit_rule_match(&ctx->ipc.oblob, |
a33e6751 | 716 | f->type, f->op, |
f17b27a2 | 717 | f->lsm_rules)) |
a33e6751 | 718 | ++result; |
6e5a2d1d DG |
719 | } |
720 | break; | |
1da177e4 LT |
721 | case AUDIT_ARG0: |
722 | case AUDIT_ARG1: | |
723 | case AUDIT_ARG2: | |
724 | case AUDIT_ARG3: | |
725 | if (ctx) | |
93315ed6 | 726 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 727 | break; |
5adc8a6a AG |
728 | case AUDIT_FILTERKEY: |
729 | /* ignore this field for filtering */ | |
730 | result = 1; | |
731 | break; | |
55669bfa AV |
732 | case AUDIT_PERM: |
733 | result = audit_match_perm(ctx, f->val); | |
0223fad3 RGB |
734 | if (f->op == Audit_not_equal) |
735 | result = !result; | |
55669bfa | 736 | break; |
8b67dca9 AV |
737 | case AUDIT_FILETYPE: |
738 | result = audit_match_filetype(ctx, f->val); | |
0223fad3 RGB |
739 | if (f->op == Audit_not_equal) |
740 | result = !result; | |
8b67dca9 | 741 | break; |
02d86a56 EP |
742 | case AUDIT_FIELD_COMPARE: |
743 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
744 | break; | |
1da177e4 | 745 | } |
f5629883 | 746 | if (!result) |
1da177e4 LT |
747 | return 0; |
748 | } | |
0590b933 AV |
749 | |
750 | if (ctx) { | |
751 | if (rule->prio <= ctx->prio) | |
752 | return 0; | |
753 | if (rule->filterkey) { | |
754 | kfree(ctx->filterkey); | |
755 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
756 | } | |
757 | ctx->prio = rule->prio; | |
758 | } | |
1da177e4 | 759 | switch (rule->action) { |
66b12abc | 760 | case AUDIT_NEVER: |
619ed58a | 761 | *state = AUDIT_STATE_DISABLED; |
66b12abc PM |
762 | break; |
763 | case AUDIT_ALWAYS: | |
619ed58a | 764 | *state = AUDIT_STATE_RECORD; |
66b12abc | 765 | break; |
1da177e4 LT |
766 | } |
767 | return 1; | |
768 | } | |
769 | ||
770 | /* At process creation time, we can determine if system-call auditing is | |
771 | * completely disabled for this task. Since we only have the task | |
772 | * structure at this point, we can only check uid and gid. | |
773 | */ | |
e048e02c | 774 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
775 | { |
776 | struct audit_entry *e; | |
777 | enum audit_state state; | |
778 | ||
779 | rcu_read_lock(); | |
0f45aa18 | 780 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
781 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
782 | &state, true)) { | |
619ed58a | 783 | if (state == AUDIT_STATE_RECORD) |
e048e02c | 784 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); |
1da177e4 LT |
785 | rcu_read_unlock(); |
786 | return state; | |
787 | } | |
788 | } | |
789 | rcu_read_unlock(); | |
619ed58a | 790 | return AUDIT_STATE_BUILD; |
1da177e4 LT |
791 | } |
792 | ||
a3c54931 AL |
793 | static int audit_in_mask(const struct audit_krule *rule, unsigned long val) |
794 | { | |
795 | int word, bit; | |
796 | ||
797 | if (val > 0xffffffff) | |
798 | return false; | |
799 | ||
800 | word = AUDIT_WORD(val); | |
801 | if (word >= AUDIT_BITMASK_SIZE) | |
802 | return false; | |
803 | ||
804 | bit = AUDIT_BIT(val); | |
805 | ||
806 | return rule->mask[word] & bit; | |
807 | } | |
808 | ||
127c8c5f YY |
809 | /* At syscall exit time, this filter is called if the audit_state is |
810 | * not low enough that auditing cannot take place, but is also not | |
811 | * high enough that we already know we have to write an audit record | |
619ed58a | 812 | * (i.e., the state is AUDIT_STATE_BUILD). |
1da177e4 | 813 | */ |
127c8c5f | 814 | static void audit_filter_syscall(struct task_struct *tsk, |
5504a69a | 815 | struct audit_context *ctx) |
1da177e4 LT |
816 | { |
817 | struct audit_entry *e; | |
c3896495 | 818 | enum audit_state state; |
1da177e4 | 819 | |
5b52330b | 820 | if (auditd_test_task(tsk)) |
127c8c5f | 821 | return; |
f7056d64 | 822 | |
1da177e4 | 823 | rcu_read_lock(); |
5504a69a | 824 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_EXIT], list) { |
699c1868 RGB |
825 | if (audit_in_mask(&e->rule, ctx->major) && |
826 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
827 | &state, false)) { | |
828 | rcu_read_unlock(); | |
829 | ctx->current_state = state; | |
127c8c5f | 830 | return; |
f368c07d AG |
831 | } |
832 | } | |
833 | rcu_read_unlock(); | |
127c8c5f | 834 | return; |
f368c07d AG |
835 | } |
836 | ||
5195d8e2 EP |
837 | /* |
838 | * Given an audit_name check the inode hash table to see if they match. | |
839 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
840 | */ | |
841 | static int audit_filter_inode_name(struct task_struct *tsk, | |
842 | struct audit_names *n, | |
843 | struct audit_context *ctx) { | |
5195d8e2 EP |
844 | int h = audit_hash_ino((u32)n->ino); |
845 | struct list_head *list = &audit_inode_hash[h]; | |
846 | struct audit_entry *e; | |
847 | enum audit_state state; | |
848 | ||
5195d8e2 | 849 | list_for_each_entry_rcu(e, list, list) { |
a3c54931 | 850 | if (audit_in_mask(&e->rule, ctx->major) && |
5195d8e2 EP |
851 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { |
852 | ctx->current_state = state; | |
853 | return 1; | |
854 | } | |
855 | } | |
5195d8e2 EP |
856 | return 0; |
857 | } | |
858 | ||
859 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 860 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 861 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
862 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
863 | */ | |
0590b933 | 864 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 865 | { |
5195d8e2 | 866 | struct audit_names *n; |
f368c07d | 867 | |
5b52330b | 868 | if (auditd_test_task(tsk)) |
0590b933 | 869 | return; |
f368c07d AG |
870 | |
871 | rcu_read_lock(); | |
f368c07d | 872 | |
5195d8e2 EP |
873 | list_for_each_entry(n, &ctx->names_list, list) { |
874 | if (audit_filter_inode_name(tsk, n, ctx)) | |
875 | break; | |
0f45aa18 DW |
876 | } |
877 | rcu_read_unlock(); | |
0f45aa18 DW |
878 | } |
879 | ||
3f1c8250 WR |
880 | static inline void audit_proctitle_free(struct audit_context *context) |
881 | { | |
882 | kfree(context->proctitle.value); | |
883 | context->proctitle.value = NULL; | |
884 | context->proctitle.len = 0; | |
885 | } | |
886 | ||
95e0b46f LR |
887 | static inline void audit_free_module(struct audit_context *context) |
888 | { | |
889 | if (context->type == AUDIT_KERN_MODULE) { | |
890 | kfree(context->module.name); | |
891 | context->module.name = NULL; | |
892 | } | |
893 | } | |
1da177e4 LT |
894 | static inline void audit_free_names(struct audit_context *context) |
895 | { | |
5195d8e2 | 896 | struct audit_names *n, *next; |
1da177e4 | 897 | |
5195d8e2 EP |
898 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
899 | list_del(&n->list); | |
55422d0b PM |
900 | if (n->name) |
901 | putname(n->name); | |
5195d8e2 EP |
902 | if (n->should_free) |
903 | kfree(n); | |
8c8570fb | 904 | } |
1da177e4 | 905 | context->name_count = 0; |
44707fdf JB |
906 | path_put(&context->pwd); |
907 | context->pwd.dentry = NULL; | |
908 | context->pwd.mnt = NULL; | |
1da177e4 LT |
909 | } |
910 | ||
911 | static inline void audit_free_aux(struct audit_context *context) | |
912 | { | |
913 | struct audit_aux_data *aux; | |
914 | ||
915 | while ((aux = context->aux)) { | |
916 | context->aux = aux->next; | |
917 | kfree(aux); | |
918 | } | |
e54dc243 AG |
919 | while ((aux = context->aux_pids)) { |
920 | context->aux_pids = aux->next; | |
921 | kfree(aux); | |
922 | } | |
1da177e4 LT |
923 | } |
924 | ||
1da177e4 LT |
925 | static inline struct audit_context *audit_alloc_context(enum audit_state state) |
926 | { | |
927 | struct audit_context *context; | |
928 | ||
17c6ee70 RM |
929 | context = kzalloc(sizeof(*context), GFP_KERNEL); |
930 | if (!context) | |
1da177e4 | 931 | return NULL; |
e2c5adc8 | 932 | context->state = state; |
619ed58a | 933 | context->prio = state == AUDIT_STATE_RECORD ? ~0ULL : 0; |
916d7576 | 934 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 935 | INIT_LIST_HEAD(&context->names_list); |
6d915476 | 936 | context->fds[0] = -1; |
ba59eae7 | 937 | context->return_valid = AUDITSC_INVALID; |
1da177e4 LT |
938 | return context; |
939 | } | |
940 | ||
b0dd25a8 RD |
941 | /** |
942 | * audit_alloc - allocate an audit context block for a task | |
943 | * @tsk: task | |
944 | * | |
945 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
946 | * if necessary. Doing so turns on system call auditing for the |
947 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
948 | * needed. |
949 | */ | |
1da177e4 LT |
950 | int audit_alloc(struct task_struct *tsk) |
951 | { | |
952 | struct audit_context *context; | |
953 | enum audit_state state; | |
e048e02c | 954 | char *key = NULL; |
1da177e4 | 955 | |
b593d384 | 956 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
957 | return 0; /* Return if not auditing. */ |
958 | ||
e048e02c | 959 | state = audit_filter_task(tsk, &key); |
85ff5379 | 960 | if (!lsm_multiple_contexts() && state == AUDIT_STATE_DISABLED) { |
785dc4eb | 961 | clear_task_syscall_work(tsk, SYSCALL_AUDIT); |
1da177e4 | 962 | return 0; |
d48d8051 | 963 | } |
85ff5379 CS |
964 | if (state == AUDIT_STATE_DISABLED) |
965 | clear_task_syscall_work(tsk, SYSCALL_AUDIT); | |
1da177e4 LT |
966 | |
967 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 968 | kfree(key); |
1da177e4 LT |
969 | audit_log_lost("out of memory in audit_alloc"); |
970 | return -ENOMEM; | |
971 | } | |
e048e02c | 972 | context->filterkey = key; |
1da177e4 | 973 | |
c0b0ae8a | 974 | audit_set_context(tsk, context); |
785dc4eb | 975 | set_task_syscall_work(tsk, SYSCALL_AUDIT); |
1da177e4 LT |
976 | return 0; |
977 | } | |
978 | ||
979 | static inline void audit_free_context(struct audit_context *context) | |
980 | { | |
95e0b46f | 981 | audit_free_module(context); |
c62d773a AV |
982 | audit_free_names(context); |
983 | unroll_tree_refs(context, NULL, 0); | |
984 | free_tree_refs(context); | |
985 | audit_free_aux(context); | |
986 | kfree(context->filterkey); | |
987 | kfree(context->sockaddr); | |
3f1c8250 | 988 | audit_proctitle_free(context); |
c62d773a | 989 | kfree(context); |
1da177e4 LT |
990 | } |
991 | ||
e54dc243 | 992 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
36fd78ba CS |
993 | kuid_t auid, kuid_t uid, |
994 | unsigned int sessionid, | |
995 | struct lsmblob *blob, char *comm) | |
e54dc243 AG |
996 | { |
997 | struct audit_buffer *ab; | |
e54dc243 AG |
998 | int rc = 0; |
999 | ||
1000 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
1001 | if (!ab) | |
6246ccab | 1002 | return rc; |
e54dc243 | 1003 | |
e1760bd5 EB |
1004 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
1005 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 1006 | from_kuid(&init_user_ns, uid), sessionid); |
558fd844 | 1007 | rc = audit_log_object_context(ab, blob); |
c2a7780e EP |
1008 | audit_log_format(ab, " ocomm="); |
1009 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1010 | audit_log_end(ab); |
e54dc243 AG |
1011 | |
1012 | return rc; | |
1013 | } | |
1014 | ||
43761473 PM |
1015 | static void audit_log_execve_info(struct audit_context *context, |
1016 | struct audit_buffer **ab) | |
bdf4c48a | 1017 | { |
43761473 PM |
1018 | long len_max; |
1019 | long len_rem; | |
1020 | long len_full; | |
1021 | long len_buf; | |
8443075e | 1022 | long len_abuf = 0; |
43761473 PM |
1023 | long len_tmp; |
1024 | bool require_data; | |
1025 | bool encode; | |
1026 | unsigned int iter; | |
1027 | unsigned int arg; | |
1028 | char *buf_head; | |
1029 | char *buf; | |
1030 | const char __user *p = (const char __user *)current->mm->arg_start; | |
1031 | ||
1032 | /* NOTE: this buffer needs to be large enough to hold all the non-arg | |
1033 | * data we put in the audit record for this argument (see the | |
1034 | * code below) ... at this point in time 96 is plenty */ | |
1035 | char abuf[96]; | |
1036 | ||
1037 | /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the | |
1038 | * current value of 7500 is not as important as the fact that it | |
1039 | * is less than 8k, a setting of 7500 gives us plenty of wiggle | |
1040 | * room if we go over a little bit in the logging below */ | |
1041 | WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500); | |
1042 | len_max = MAX_EXECVE_AUDIT_LEN; | |
1043 | ||
1044 | /* scratch buffer to hold the userspace args */ | |
1045 | buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1046 | if (!buf_head) { | |
1047 | audit_panic("out of memory for argv string"); | |
1048 | return; | |
de6bbd1d | 1049 | } |
43761473 | 1050 | buf = buf_head; |
040b3a2d | 1051 | |
43761473 | 1052 | audit_log_format(*ab, "argc=%d", context->execve.argc); |
040b3a2d | 1053 | |
43761473 PM |
1054 | len_rem = len_max; |
1055 | len_buf = 0; | |
1056 | len_full = 0; | |
1057 | require_data = true; | |
1058 | encode = false; | |
1059 | iter = 0; | |
1060 | arg = 0; | |
de6bbd1d | 1061 | do { |
43761473 PM |
1062 | /* NOTE: we don't ever want to trust this value for anything |
1063 | * serious, but the audit record format insists we | |
1064 | * provide an argument length for really long arguments, | |
1065 | * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but | |
1066 | * to use strncpy_from_user() to obtain this value for | |
1067 | * recording in the log, although we don't use it | |
1068 | * anywhere here to avoid a double-fetch problem */ | |
1069 | if (len_full == 0) | |
1070 | len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
1071 | ||
1072 | /* read more data from userspace */ | |
1073 | if (require_data) { | |
1074 | /* can we make more room in the buffer? */ | |
1075 | if (buf != buf_head) { | |
1076 | memmove(buf_head, buf, len_buf); | |
1077 | buf = buf_head; | |
1078 | } | |
1079 | ||
1080 | /* fetch as much as we can of the argument */ | |
1081 | len_tmp = strncpy_from_user(&buf_head[len_buf], p, | |
1082 | len_max - len_buf); | |
1083 | if (len_tmp == -EFAULT) { | |
1084 | /* unable to copy from userspace */ | |
1085 | send_sig(SIGKILL, current, 0); | |
1086 | goto out; | |
1087 | } else if (len_tmp == (len_max - len_buf)) { | |
1088 | /* buffer is not large enough */ | |
1089 | require_data = true; | |
1090 | /* NOTE: if we are going to span multiple | |
1091 | * buffers force the encoding so we stand | |
1092 | * a chance at a sane len_full value and | |
1093 | * consistent record encoding */ | |
1094 | encode = true; | |
1095 | len_full = len_full * 2; | |
1096 | p += len_tmp; | |
1097 | } else { | |
1098 | require_data = false; | |
1099 | if (!encode) | |
1100 | encode = audit_string_contains_control( | |
1101 | buf, len_tmp); | |
1102 | /* try to use a trusted value for len_full */ | |
1103 | if (len_full < len_max) | |
1104 | len_full = (encode ? | |
1105 | len_tmp * 2 : len_tmp); | |
1106 | p += len_tmp + 1; | |
1107 | } | |
1108 | len_buf += len_tmp; | |
1109 | buf_head[len_buf] = '\0'; | |
bdf4c48a | 1110 | |
43761473 PM |
1111 | /* length of the buffer in the audit record? */ |
1112 | len_abuf = (encode ? len_buf * 2 : len_buf + 2); | |
bdf4c48a | 1113 | } |
de6bbd1d | 1114 | |
43761473 | 1115 | /* write as much as we can to the audit log */ |
ea956d8b | 1116 | if (len_buf >= 0) { |
43761473 PM |
1117 | /* NOTE: some magic numbers here - basically if we |
1118 | * can't fit a reasonable amount of data into the | |
1119 | * existing audit buffer, flush it and start with | |
1120 | * a new buffer */ | |
1121 | if ((sizeof(abuf) + 8) > len_rem) { | |
1122 | len_rem = len_max; | |
1123 | audit_log_end(*ab); | |
1124 | *ab = audit_log_start(context, | |
1125 | GFP_KERNEL, AUDIT_EXECVE); | |
1126 | if (!*ab) | |
1127 | goto out; | |
1128 | } | |
bdf4c48a | 1129 | |
43761473 PM |
1130 | /* create the non-arg portion of the arg record */ |
1131 | len_tmp = 0; | |
1132 | if (require_data || (iter > 0) || | |
1133 | ((len_abuf + sizeof(abuf)) > len_rem)) { | |
1134 | if (iter == 0) { | |
1135 | len_tmp += snprintf(&abuf[len_tmp], | |
1136 | sizeof(abuf) - len_tmp, | |
1137 | " a%d_len=%lu", | |
1138 | arg, len_full); | |
1139 | } | |
1140 | len_tmp += snprintf(&abuf[len_tmp], | |
1141 | sizeof(abuf) - len_tmp, | |
1142 | " a%d[%d]=", arg, iter++); | |
1143 | } else | |
1144 | len_tmp += snprintf(&abuf[len_tmp], | |
1145 | sizeof(abuf) - len_tmp, | |
1146 | " a%d=", arg); | |
1147 | WARN_ON(len_tmp >= sizeof(abuf)); | |
1148 | abuf[sizeof(abuf) - 1] = '\0'; | |
1149 | ||
1150 | /* log the arg in the audit record */ | |
1151 | audit_log_format(*ab, "%s", abuf); | |
1152 | len_rem -= len_tmp; | |
1153 | len_tmp = len_buf; | |
1154 | if (encode) { | |
1155 | if (len_abuf > len_rem) | |
1156 | len_tmp = len_rem / 2; /* encoding */ | |
1157 | audit_log_n_hex(*ab, buf, len_tmp); | |
1158 | len_rem -= len_tmp * 2; | |
1159 | len_abuf -= len_tmp * 2; | |
1160 | } else { | |
1161 | if (len_abuf > len_rem) | |
1162 | len_tmp = len_rem - 2; /* quotes */ | |
1163 | audit_log_n_string(*ab, buf, len_tmp); | |
1164 | len_rem -= len_tmp + 2; | |
1165 | /* don't subtract the "2" because we still need | |
1166 | * to add quotes to the remaining string */ | |
1167 | len_abuf -= len_tmp; | |
1168 | } | |
1169 | len_buf -= len_tmp; | |
1170 | buf += len_tmp; | |
1171 | } | |
bdf4c48a | 1172 | |
43761473 PM |
1173 | /* ready to move to the next argument? */ |
1174 | if ((len_buf == 0) && !require_data) { | |
1175 | arg++; | |
1176 | iter = 0; | |
1177 | len_full = 0; | |
1178 | require_data = true; | |
1179 | encode = false; | |
1180 | } | |
1181 | } while (arg < context->execve.argc); | |
de6bbd1d | 1182 | |
43761473 | 1183 | /* NOTE: the caller handles the final audit_log_end() call */ |
de6bbd1d | 1184 | |
43761473 PM |
1185 | out: |
1186 | kfree(buf_head); | |
bdf4c48a PZ |
1187 | } |
1188 | ||
2efa48fe Y |
1189 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, |
1190 | kernel_cap_t *cap) | |
5f3d544f RGB |
1191 | { |
1192 | int i; | |
1193 | ||
1194 | if (cap_isclear(*cap)) { | |
1195 | audit_log_format(ab, " %s=0", prefix); | |
1196 | return; | |
1197 | } | |
1198 | audit_log_format(ab, " %s=", prefix); | |
1199 | CAP_FOR_EACH_U32(i) | |
1200 | audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]); | |
1201 | } | |
1202 | ||
1203 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1204 | { | |
1205 | if (name->fcap_ver == -1) { | |
1206 | audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?"); | |
1207 | return; | |
1208 | } | |
1209 | audit_log_cap(ab, "cap_fp", &name->fcap.permitted); | |
1210 | audit_log_cap(ab, "cap_fi", &name->fcap.inheritable); | |
1211 | audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d", | |
1212 | name->fcap.fE, name->fcap_ver, | |
1213 | from_kuid(&init_user_ns, name->fcap.rootid)); | |
1214 | } | |
1215 | ||
dc4607d9 RGB |
1216 | static void audit_log_time(struct audit_context *context, struct audit_buffer **ab) |
1217 | { | |
1218 | const struct audit_ntp_data *ntp = &context->time.ntp_data; | |
1219 | const struct timespec64 *tk = &context->time.tk_injoffset; | |
1220 | static const char * const ntp_name[] = { | |
1221 | "offset", | |
1222 | "freq", | |
1223 | "status", | |
1224 | "tai", | |
1225 | "tick", | |
1226 | "adjust", | |
1227 | }; | |
1228 | int type; | |
1229 | ||
1230 | if (context->type == AUDIT_TIME_ADJNTPVAL) { | |
1231 | for (type = 0; type < AUDIT_NTP_NVALS; type++) { | |
1232 | if (ntp->vals[type].newval != ntp->vals[type].oldval) { | |
1233 | if (!*ab) { | |
1234 | *ab = audit_log_start(context, | |
1235 | GFP_KERNEL, | |
1236 | AUDIT_TIME_ADJNTPVAL); | |
1237 | if (!*ab) | |
1238 | return; | |
1239 | } | |
1240 | audit_log_format(*ab, "op=%s old=%lli new=%lli", | |
1241 | ntp_name[type], | |
1242 | ntp->vals[type].oldval, | |
1243 | ntp->vals[type].newval); | |
1244 | audit_log_end(*ab); | |
1245 | *ab = NULL; | |
1246 | } | |
1247 | } | |
1248 | } | |
1249 | if (tk->tv_sec != 0 || tk->tv_nsec != 0) { | |
1250 | if (!*ab) { | |
1251 | *ab = audit_log_start(context, GFP_KERNEL, | |
1252 | AUDIT_TIME_INJOFFSET); | |
1253 | if (!*ab) | |
1254 | return; | |
1255 | } | |
1256 | audit_log_format(*ab, "sec=%lli nsec=%li", | |
1257 | (long long)tk->tv_sec, tk->tv_nsec); | |
1258 | audit_log_end(*ab); | |
1259 | *ab = NULL; | |
1260 | } | |
1261 | } | |
1262 | ||
a33e6751 | 1263 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1264 | { |
1265 | struct audit_buffer *ab; | |
1266 | int i; | |
1267 | ||
1268 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1269 | if (!ab) | |
1270 | return; | |
1271 | ||
1272 | switch (context->type) { | |
1273 | case AUDIT_SOCKETCALL: { | |
1274 | int nargs = context->socketcall.nargs; | |
254c8b96 | 1275 | |
f3298dc4 AV |
1276 | audit_log_format(ab, "nargs=%d", nargs); |
1277 | for (i = 0; i < nargs; i++) | |
1278 | audit_log_format(ab, " a%d=%lx", i, | |
1279 | context->socketcall.args[i]); | |
1280 | break; } | |
a33e6751 | 1281 | case AUDIT_IPC: { |
558fd844 | 1282 | struct lsmblob *oblob = &context->ipc.oblob; |
a33e6751 | 1283 | |
2570ebbd | 1284 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1285 | from_kuid(&init_user_ns, context->ipc.uid), |
1286 | from_kgid(&init_user_ns, context->ipc.gid), | |
1287 | context->ipc.mode); | |
558fd844 CS |
1288 | if (audit_log_object_context(ab, oblob)) |
1289 | *call_panic = 1; | |
e816f370 AV |
1290 | if (context->ipc.has_perm) { |
1291 | audit_log_end(ab); | |
1292 | ab = audit_log_start(context, GFP_KERNEL, | |
1293 | AUDIT_IPC_SET_PERM); | |
0644ec0c KC |
1294 | if (unlikely(!ab)) |
1295 | return; | |
e816f370 | 1296 | audit_log_format(ab, |
2570ebbd | 1297 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1298 | context->ipc.qbytes, |
1299 | context->ipc.perm_uid, | |
1300 | context->ipc.perm_gid, | |
1301 | context->ipc.perm_mode); | |
e816f370 | 1302 | } |
a33e6751 | 1303 | break; } |
fe8e52b9 | 1304 | case AUDIT_MQ_OPEN: |
564f6993 | 1305 | audit_log_format(ab, |
df0a4283 | 1306 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1307 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1308 | context->mq_open.oflag, context->mq_open.mode, | |
1309 | context->mq_open.attr.mq_flags, | |
1310 | context->mq_open.attr.mq_maxmsg, | |
1311 | context->mq_open.attr.mq_msgsize, | |
1312 | context->mq_open.attr.mq_curmsgs); | |
fe8e52b9 PM |
1313 | break; |
1314 | case AUDIT_MQ_SENDRECV: | |
c32c8af4 AV |
1315 | audit_log_format(ab, |
1316 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
b9047726 | 1317 | "abs_timeout_sec=%lld abs_timeout_nsec=%ld", |
c32c8af4 AV |
1318 | context->mq_sendrecv.mqdes, |
1319 | context->mq_sendrecv.msg_len, | |
1320 | context->mq_sendrecv.msg_prio, | |
b9047726 | 1321 | (long long) context->mq_sendrecv.abs_timeout.tv_sec, |
c32c8af4 | 1322 | context->mq_sendrecv.abs_timeout.tv_nsec); |
fe8e52b9 PM |
1323 | break; |
1324 | case AUDIT_MQ_NOTIFY: | |
20114f71 AV |
1325 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", |
1326 | context->mq_notify.mqdes, | |
1327 | context->mq_notify.sigev_signo); | |
fe8e52b9 | 1328 | break; |
7392906e AV |
1329 | case AUDIT_MQ_GETSETATTR: { |
1330 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
254c8b96 | 1331 | |
7392906e AV |
1332 | audit_log_format(ab, |
1333 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1334 | "mq_curmsgs=%ld ", | |
1335 | context->mq_getsetattr.mqdes, | |
1336 | attr->mq_flags, attr->mq_maxmsg, | |
1337 | attr->mq_msgsize, attr->mq_curmsgs); | |
1338 | break; } | |
fe8e52b9 | 1339 | case AUDIT_CAPSET: |
57f71a0a AV |
1340 | audit_log_format(ab, "pid=%d", context->capset.pid); |
1341 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1342 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1343 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
7786f6b6 | 1344 | audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient); |
fe8e52b9 PM |
1345 | break; |
1346 | case AUDIT_MMAP: | |
120a795d AV |
1347 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, |
1348 | context->mmap.flags); | |
fe8e52b9 PM |
1349 | break; |
1350 | case AUDIT_EXECVE: | |
d9cfea91 | 1351 | audit_log_execve_info(context, &ab); |
fe8e52b9 | 1352 | break; |
ca86cad7 RGB |
1353 | case AUDIT_KERN_MODULE: |
1354 | audit_log_format(ab, "name="); | |
b305f7ed YW |
1355 | if (context->module.name) { |
1356 | audit_log_untrustedstring(ab, context->module.name); | |
b305f7ed YW |
1357 | } else |
1358 | audit_log_format(ab, "(null)"); | |
1359 | ||
ca86cad7 | 1360 | break; |
dc4607d9 RGB |
1361 | case AUDIT_TIME_ADJNTPVAL: |
1362 | case AUDIT_TIME_INJOFFSET: | |
1363 | /* this call deviates from the rest, eating the buffer */ | |
1364 | audit_log_time(context, &ab); | |
1365 | break; | |
f3298dc4 AV |
1366 | } |
1367 | audit_log_end(ab); | |
1368 | } | |
1369 | ||
3f1c8250 WR |
1370 | static inline int audit_proctitle_rtrim(char *proctitle, int len) |
1371 | { | |
1372 | char *end = proctitle + len - 1; | |
254c8b96 | 1373 | |
3f1c8250 WR |
1374 | while (end > proctitle && !isprint(*end)) |
1375 | end--; | |
1376 | ||
1377 | /* catch the case where proctitle is only 1 non-print character */ | |
1378 | len = end - proctitle + 1; | |
1379 | len -= isprint(proctitle[len-1]) == 0; | |
1380 | return len; | |
1381 | } | |
1382 | ||
5f3d544f RGB |
1383 | /* |
1384 | * audit_log_name - produce AUDIT_PATH record from struct audit_names | |
1385 | * @context: audit_context for the task | |
1386 | * @n: audit_names structure with reportable details | |
1387 | * @path: optional path to report instead of audit_names->name | |
1388 | * @record_num: record number to report when handling a list of names | |
1389 | * @call_panic: optional pointer to int that will be updated if secid fails | |
1390 | */ | |
1391 | static void audit_log_name(struct audit_context *context, struct audit_names *n, | |
1392 | const struct path *path, int record_num, int *call_panic) | |
1393 | { | |
1394 | struct audit_buffer *ab; | |
1395 | ||
1396 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1397 | if (!ab) | |
1398 | return; | |
1399 | ||
1400 | audit_log_format(ab, "item=%d", record_num); | |
1401 | ||
1402 | if (path) | |
1403 | audit_log_d_path(ab, " name=", path); | |
1404 | else if (n->name) { | |
1405 | switch (n->name_len) { | |
1406 | case AUDIT_NAME_FULL: | |
1407 | /* log the full path */ | |
1408 | audit_log_format(ab, " name="); | |
1409 | audit_log_untrustedstring(ab, n->name->name); | |
1410 | break; | |
1411 | case 0: | |
1412 | /* name was specified as a relative path and the | |
1413 | * directory component is the cwd | |
1414 | */ | |
6d915476 RGB |
1415 | if (context->pwd.dentry && context->pwd.mnt) |
1416 | audit_log_d_path(ab, " name=", &context->pwd); | |
1417 | else | |
1418 | audit_log_format(ab, " name=(null)"); | |
5f3d544f RGB |
1419 | break; |
1420 | default: | |
1421 | /* log the name's directory component */ | |
1422 | audit_log_format(ab, " name="); | |
1423 | audit_log_n_untrustedstring(ab, n->name->name, | |
1424 | n->name_len); | |
1425 | } | |
1426 | } else | |
1427 | audit_log_format(ab, " name=(null)"); | |
1428 | ||
1429 | if (n->ino != AUDIT_INO_UNSET) | |
1430 | audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x", | |
1431 | n->ino, | |
1432 | MAJOR(n->dev), | |
1433 | MINOR(n->dev), | |
1434 | n->mode, | |
1435 | from_kuid(&init_user_ns, n->uid), | |
1436 | from_kgid(&init_user_ns, n->gid), | |
1437 | MAJOR(n->rdev), | |
1438 | MINOR(n->rdev)); | |
558fd844 CS |
1439 | if (audit_log_object_context(ab, &n->oblob) && call_panic) |
1440 | *call_panic = 2; | |
5f3d544f RGB |
1441 | |
1442 | /* log the audit_names record type */ | |
1443 | switch (n->type) { | |
1444 | case AUDIT_TYPE_NORMAL: | |
1445 | audit_log_format(ab, " nametype=NORMAL"); | |
1446 | break; | |
1447 | case AUDIT_TYPE_PARENT: | |
1448 | audit_log_format(ab, " nametype=PARENT"); | |
1449 | break; | |
1450 | case AUDIT_TYPE_CHILD_DELETE: | |
1451 | audit_log_format(ab, " nametype=DELETE"); | |
1452 | break; | |
1453 | case AUDIT_TYPE_CHILD_CREATE: | |
1454 | audit_log_format(ab, " nametype=CREATE"); | |
1455 | break; | |
1456 | default: | |
1457 | audit_log_format(ab, " nametype=UNKNOWN"); | |
1458 | break; | |
1459 | } | |
1460 | ||
1461 | audit_log_fcaps(ab, n); | |
1462 | audit_log_end(ab); | |
1463 | } | |
1464 | ||
2a1fe215 | 1465 | static void audit_log_proctitle(void) |
3f1c8250 WR |
1466 | { |
1467 | int res; | |
1468 | char *buf; | |
1469 | char *msg = "(null)"; | |
1470 | int len = strlen(msg); | |
2a1fe215 | 1471 | struct audit_context *context = audit_context(); |
3f1c8250 WR |
1472 | struct audit_buffer *ab; |
1473 | ||
1474 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE); | |
1475 | if (!ab) | |
1476 | return; /* audit_panic or being filtered */ | |
1477 | ||
1478 | audit_log_format(ab, "proctitle="); | |
1479 | ||
1480 | /* Not cached */ | |
1481 | if (!context->proctitle.value) { | |
1482 | buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL); | |
1483 | if (!buf) | |
1484 | goto out; | |
1485 | /* Historically called this from procfs naming */ | |
2a1fe215 | 1486 | res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN); |
3f1c8250 WR |
1487 | if (res == 0) { |
1488 | kfree(buf); | |
1489 | goto out; | |
1490 | } | |
1491 | res = audit_proctitle_rtrim(buf, res); | |
1492 | if (res == 0) { | |
1493 | kfree(buf); | |
1494 | goto out; | |
1495 | } | |
1496 | context->proctitle.value = buf; | |
1497 | context->proctitle.len = res; | |
1498 | } | |
1499 | msg = context->proctitle.value; | |
1500 | len = context->proctitle.len; | |
1501 | out: | |
1502 | audit_log_n_untrustedstring(ab, msg, len); | |
1503 | audit_log_end(ab); | |
1504 | } | |
1505 | ||
85ff5379 CS |
1506 | void audit_log_lsm(struct lsmblob *blob, bool exiting) |
1507 | { | |
1508 | struct audit_context *context = audit_context(); | |
1509 | struct lsmcontext lsmdata; | |
1510 | struct audit_buffer *ab; | |
1511 | struct lsmblob localblob; | |
1512 | bool sep = false; | |
1513 | int error; | |
1514 | int i; | |
1515 | ||
1516 | if (!lsm_multiple_contexts()) | |
1517 | return; | |
1518 | ||
1519 | if (context && context->in_syscall && !exiting) | |
1520 | return; | |
1521 | ||
1522 | ab = audit_log_start(context, GFP_ATOMIC, AUDIT_MAC_TASK_CONTEXTS); | |
1523 | if (!ab) | |
1524 | return; /* audit_panic or being filtered */ | |
1525 | ||
1526 | if (blob == NULL) { | |
1527 | security_task_getsecid_subj(current, &localblob); | |
1528 | if (!lsmblob_is_set(&localblob)) | |
1529 | return; | |
1530 | blob = &localblob; | |
1531 | } | |
1532 | ||
1533 | for (i = 0; i < LSMBLOB_ENTRIES; i++) { | |
1534 | if (blob->secid[i] == 0) | |
1535 | continue; | |
1536 | error = security_secid_to_secctx(blob, &lsmdata, i); | |
1537 | if (error && error != -EINVAL) { | |
1538 | audit_panic("error in audit_log_lsm"); | |
1539 | return; | |
1540 | } | |
1541 | ||
1542 | audit_log_format(ab, "%ssubj_%s=%s", sep ? " " : "", | |
1543 | security_lsm_slot_name(i), lsmdata.context); | |
1544 | sep = true; | |
1545 | ||
1546 | security_release_secctx(&lsmdata); | |
1547 | } | |
1548 | ||
1549 | audit_log_end(ab); | |
1550 | } | |
1551 | ||
2a1fe215 | 1552 | static void audit_log_exit(void) |
1da177e4 | 1553 | { |
9c7aa6aa | 1554 | int i, call_panic = 0; |
2a1fe215 | 1555 | struct audit_context *context = audit_context(); |
1da177e4 | 1556 | struct audit_buffer *ab; |
7551ced3 | 1557 | struct audit_aux_data *aux; |
5195d8e2 | 1558 | struct audit_names *n; |
1da177e4 | 1559 | |
2a1fe215 | 1560 | context->personality = current->personality; |
e495149b AV |
1561 | |
1562 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1563 | if (!ab) |
1564 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1565 | audit_log_format(ab, "arch=%x syscall=%d", |
1566 | context->arch, context->major); | |
1da177e4 LT |
1567 | if (context->personality != PER_LINUX) |
1568 | audit_log_format(ab, " per=%lx", context->personality); | |
ba59eae7 | 1569 | if (context->return_valid != AUDITSC_INVALID) |
9f8dbe9c | 1570 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1571 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1572 | context->return_code); | |
eb84a20e | 1573 | |
1da177e4 | 1574 | audit_log_format(ab, |
e23eb920 PM |
1575 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1576 | context->argv[0], | |
1577 | context->argv[1], | |
1578 | context->argv[2], | |
1579 | context->argv[3], | |
1580 | context->name_count); | |
eb84a20e | 1581 | |
2a1fe215 | 1582 | audit_log_task_info(ab); |
9d960985 | 1583 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1584 | audit_log_end(ab); |
1da177e4 | 1585 | |
7551ced3 | 1586 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1587 | |
e495149b | 1588 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1589 | if (!ab) |
1590 | continue; /* audit_panic has been called */ | |
1591 | ||
1da177e4 | 1592 | switch (aux->type) { |
20ca73bc | 1593 | |
3fc689e9 EP |
1594 | case AUDIT_BPRM_FCAPS: { |
1595 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
254c8b96 | 1596 | |
3fc689e9 EP |
1597 | audit_log_format(ab, "fver=%x", axs->fcap_ver); |
1598 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1599 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1600 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1601 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1602 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1603 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
7786f6b6 RGB |
1604 | audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient); |
1605 | audit_log_cap(ab, "pp", &axs->new_pcap.permitted); | |
1606 | audit_log_cap(ab, "pi", &axs->new_pcap.inheritable); | |
1607 | audit_log_cap(ab, "pe", &axs->new_pcap.effective); | |
1608 | audit_log_cap(ab, "pa", &axs->new_pcap.ambient); | |
2fec30e2 RGB |
1609 | audit_log_format(ab, " frootid=%d", |
1610 | from_kuid(&init_user_ns, | |
1611 | axs->fcap.rootid)); | |
3fc689e9 EP |
1612 | break; } |
1613 | ||
1da177e4 LT |
1614 | } |
1615 | audit_log_end(ab); | |
1da177e4 LT |
1616 | } |
1617 | ||
f3298dc4 | 1618 | if (context->type) |
a33e6751 | 1619 | show_special(context, &call_panic); |
f3298dc4 | 1620 | |
157cf649 AV |
1621 | if (context->fds[0] >= 0) { |
1622 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1623 | if (ab) { | |
1624 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1625 | context->fds[0], context->fds[1]); | |
1626 | audit_log_end(ab); | |
1627 | } | |
1628 | } | |
1629 | ||
4f6b434f AV |
1630 | if (context->sockaddr_len) { |
1631 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1632 | if (ab) { | |
1633 | audit_log_format(ab, "saddr="); | |
1634 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1635 | context->sockaddr_len); | |
1636 | audit_log_end(ab); | |
1637 | } | |
1638 | } | |
1639 | ||
e54dc243 AG |
1640 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1641 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1642 | |
1643 | for (i = 0; i < axs->pid_count; i++) | |
1644 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1645 | axs->target_auid[i], |
1646 | axs->target_uid[i], | |
4746ec5b | 1647 | axs->target_sessionid[i], |
36fd78ba | 1648 | &axs->target_lsm[i], |
c2a7780e | 1649 | axs->target_comm[i])) |
e54dc243 | 1650 | call_panic = 1; |
a5cb013d AV |
1651 | } |
1652 | ||
e54dc243 AG |
1653 | if (context->target_pid && |
1654 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1655 | context->target_auid, context->target_uid, |
4746ec5b | 1656 | context->target_sessionid, |
36fd78ba | 1657 | &context->target_lsm, context->target_comm)) |
e54dc243 AG |
1658 | call_panic = 1; |
1659 | ||
44707fdf | 1660 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1661 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1662 | if (ab) { |
0b7a0fdb | 1663 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1664 | audit_log_end(ab); |
1665 | } | |
1666 | } | |
73241ccc | 1667 | |
5195d8e2 | 1668 | i = 0; |
79f6530c JL |
1669 | list_for_each_entry(n, &context->names_list, list) { |
1670 | if (n->hidden) | |
1671 | continue; | |
b24a30a7 | 1672 | audit_log_name(context, n, NULL, i++, &call_panic); |
79f6530c | 1673 | } |
c0641f28 | 1674 | |
2a1fe215 | 1675 | audit_log_proctitle(); |
85ff5379 | 1676 | audit_log_lsm(NULL, true); |
3f1c8250 | 1677 | |
c0641f28 EP |
1678 | /* Send end of event record to help user space know we are finished */ |
1679 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1680 | if (ab) | |
1681 | audit_log_end(ab); | |
9c7aa6aa SG |
1682 | if (call_panic) |
1683 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1684 | } |
1685 | ||
b0dd25a8 | 1686 | /** |
196a5085 | 1687 | * __audit_free - free a per-task audit context |
b0dd25a8 RD |
1688 | * @tsk: task whose audit context block to free |
1689 | * | |
fa84cb93 | 1690 | * Called from copy_process and do_exit |
b0dd25a8 | 1691 | */ |
a4ff8dba | 1692 | void __audit_free(struct task_struct *tsk) |
1da177e4 | 1693 | { |
2a1fe215 | 1694 | struct audit_context *context = tsk->audit_context; |
1da177e4 | 1695 | |
56179a6e | 1696 | if (!context) |
1da177e4 LT |
1697 | return; |
1698 | ||
9e36a5d4 RGB |
1699 | if (!list_empty(&context->killed_trees)) |
1700 | audit_kill_trees(context); | |
1701 | ||
2a1fe215 PM |
1702 | /* We are called either by do_exit() or the fork() error handling code; |
1703 | * in the former case tsk == current and in the latter tsk is a | |
1704 | * random task_struct that doesn't doesn't have any meaningful data we | |
1705 | * need to log via audit_log_exit(). | |
1706 | */ | |
1707 | if (tsk == current && !context->dummy && context->in_syscall) { | |
ba59eae7 | 1708 | context->return_valid = AUDITSC_INVALID; |
2a1fe215 PM |
1709 | context->return_code = 0; |
1710 | ||
5504a69a | 1711 | audit_filter_syscall(tsk, context); |
2a1fe215 | 1712 | audit_filter_inodes(tsk, context); |
619ed58a | 1713 | if (context->current_state == AUDIT_STATE_RECORD) |
2a1fe215 PM |
1714 | audit_log_exit(); |
1715 | } | |
1716 | ||
2a1fe215 | 1717 | audit_set_context(tsk, NULL); |
1da177e4 LT |
1718 | audit_free_context(context); |
1719 | } | |
1720 | ||
b0dd25a8 | 1721 | /** |
196a5085 | 1722 | * __audit_syscall_entry - fill in an audit record at syscall entry |
b0dd25a8 RD |
1723 | * @major: major syscall type (function) |
1724 | * @a1: additional syscall register 1 | |
1725 | * @a2: additional syscall register 2 | |
1726 | * @a3: additional syscall register 3 | |
1727 | * @a4: additional syscall register 4 | |
1728 | * | |
1729 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1730 | * audit context was created when the task was created and the state or |
1731 | * filters demand the audit context be built. If the state from the | |
619ed58a | 1732 | * per-task filter or from the per-syscall filter is AUDIT_STATE_RECORD, |
1da177e4 LT |
1733 | * then the record will be written at syscall exit time (otherwise, it |
1734 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1735 | * be written). |
1736 | */ | |
b4f0d375 RGB |
1737 | void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2, |
1738 | unsigned long a3, unsigned long a4) | |
1da177e4 | 1739 | { |
cdfb6b34 | 1740 | struct audit_context *context = audit_context(); |
1da177e4 LT |
1741 | enum audit_state state; |
1742 | ||
94d14e3e | 1743 | if (!audit_enabled || !context) |
86a1c34a | 1744 | return; |
1da177e4 | 1745 | |
1da177e4 LT |
1746 | BUG_ON(context->in_syscall || context->name_count); |
1747 | ||
1da177e4 | 1748 | state = context->state; |
619ed58a | 1749 | if (state == AUDIT_STATE_DISABLED) |
5260ecc2 RGB |
1750 | return; |
1751 | ||
d51374ad | 1752 | context->dummy = !audit_n_rules; |
619ed58a | 1753 | if (!context->dummy && state == AUDIT_STATE_BUILD) { |
0590b933 | 1754 | context->prio = 0; |
cdfb6b34 | 1755 | if (auditd_test_task(current)) |
5260ecc2 | 1756 | return; |
0590b933 | 1757 | } |
1da177e4 | 1758 | |
16add411 | 1759 | context->arch = syscall_get_arch(current); |
5260ecc2 RGB |
1760 | context->major = major; |
1761 | context->argv[0] = a1; | |
1762 | context->argv[1] = a2; | |
1763 | context->argv[2] = a3; | |
1764 | context->argv[3] = a4; | |
ce625a80 | 1765 | context->serial = 0; |
1da177e4 | 1766 | context->in_syscall = 1; |
0590b933 | 1767 | context->current_state = state; |
419c58f1 | 1768 | context->ppid = 0; |
290e44b7 | 1769 | ktime_get_coarse_real_ts64(&context->ctime); |
1da177e4 LT |
1770 | } |
1771 | ||
b0dd25a8 | 1772 | /** |
196a5085 | 1773 | * __audit_syscall_exit - deallocate audit context after a system call |
42ae610c RD |
1774 | * @success: success value of the syscall |
1775 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1776 | * |
1777 | * Tear down after system call. If the audit context has been marked as | |
619ed58a | 1778 | * auditable (either because of the AUDIT_STATE_RECORD state from |
42ae610c | 1779 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1780 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1781 | * free the names stored from getname(). |
1782 | */ | |
d7e7528b | 1783 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 LT |
1784 | { |
1785 | struct audit_context *context; | |
1786 | ||
2a1fe215 | 1787 | context = audit_context(); |
56179a6e | 1788 | if (!context) |
97e94c45 | 1789 | return; |
1da177e4 | 1790 | |
9e36a5d4 RGB |
1791 | if (!list_empty(&context->killed_trees)) |
1792 | audit_kill_trees(context); | |
1793 | ||
2a1fe215 PM |
1794 | if (!context->dummy && context->in_syscall) { |
1795 | if (success) | |
1796 | context->return_valid = AUDITSC_SUCCESS; | |
1797 | else | |
1798 | context->return_valid = AUDITSC_FAILURE; | |
1799 | ||
1800 | /* | |
1801 | * we need to fix up the return code in the audit logs if the | |
1802 | * actual return codes are later going to be fixed up by the | |
1803 | * arch specific signal handlers | |
1804 | * | |
1805 | * This is actually a test for: | |
1806 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
1807 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
1808 | * | |
1809 | * but is faster than a bunch of || | |
1810 | */ | |
1811 | if (unlikely(return_code <= -ERESTARTSYS) && | |
1812 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
1813 | (return_code != -ENOIOCTLCMD)) | |
1814 | context->return_code = -EINTR; | |
1815 | else | |
1816 | context->return_code = return_code; | |
1817 | ||
5504a69a | 1818 | audit_filter_syscall(current, context); |
2a1fe215 | 1819 | audit_filter_inodes(current, context); |
619ed58a | 1820 | if (context->current_state == AUDIT_STATE_RECORD) |
2a1fe215 PM |
1821 | audit_log_exit(); |
1822 | } | |
1da177e4 LT |
1823 | |
1824 | context->in_syscall = 0; | |
619ed58a | 1825 | context->prio = context->state == AUDIT_STATE_RECORD ? ~0ULL : 0; |
2fd6f58b | 1826 | |
95e0b46f | 1827 | audit_free_module(context); |
c62d773a AV |
1828 | audit_free_names(context); |
1829 | unroll_tree_refs(context, NULL, 0); | |
1830 | audit_free_aux(context); | |
1831 | context->aux = NULL; | |
1832 | context->aux_pids = NULL; | |
1833 | context->target_pid = 0; | |
36fd78ba | 1834 | lsmblob_init(&context->target_lsm, 0); |
c62d773a AV |
1835 | context->sockaddr_len = 0; |
1836 | context->type = 0; | |
1837 | context->fds[0] = -1; | |
619ed58a | 1838 | if (context->state != AUDIT_STATE_RECORD) { |
c62d773a AV |
1839 | kfree(context->filterkey); |
1840 | context->filterkey = NULL; | |
1da177e4 | 1841 | } |
1da177e4 LT |
1842 | } |
1843 | ||
74c3cbe3 AV |
1844 | static inline void handle_one(const struct inode *inode) |
1845 | { | |
74c3cbe3 AV |
1846 | struct audit_context *context; |
1847 | struct audit_tree_refs *p; | |
1848 | struct audit_chunk *chunk; | |
1849 | int count; | |
254c8b96 | 1850 | |
08991e83 | 1851 | if (likely(!inode->i_fsnotify_marks)) |
74c3cbe3 | 1852 | return; |
cdfb6b34 | 1853 | context = audit_context(); |
74c3cbe3 AV |
1854 | p = context->trees; |
1855 | count = context->tree_count; | |
1856 | rcu_read_lock(); | |
1857 | chunk = audit_tree_lookup(inode); | |
1858 | rcu_read_unlock(); | |
1859 | if (!chunk) | |
1860 | return; | |
1861 | if (likely(put_tree_ref(context, chunk))) | |
1862 | return; | |
1863 | if (unlikely(!grow_tree_refs(context))) { | |
f952d10f | 1864 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1865 | audit_set_auditable(context); |
1866 | audit_put_chunk(chunk); | |
1867 | unroll_tree_refs(context, p, count); | |
1868 | return; | |
1869 | } | |
1870 | put_tree_ref(context, chunk); | |
74c3cbe3 AV |
1871 | } |
1872 | ||
1873 | static void handle_path(const struct dentry *dentry) | |
1874 | { | |
74c3cbe3 AV |
1875 | struct audit_context *context; |
1876 | struct audit_tree_refs *p; | |
1877 | const struct dentry *d, *parent; | |
1878 | struct audit_chunk *drop; | |
1879 | unsigned long seq; | |
1880 | int count; | |
1881 | ||
cdfb6b34 | 1882 | context = audit_context(); |
74c3cbe3 AV |
1883 | p = context->trees; |
1884 | count = context->tree_count; | |
1885 | retry: | |
1886 | drop = NULL; | |
1887 | d = dentry; | |
1888 | rcu_read_lock(); | |
1889 | seq = read_seqbegin(&rename_lock); | |
1890 | for(;;) { | |
3b362157 | 1891 | struct inode *inode = d_backing_inode(d); |
254c8b96 | 1892 | |
08991e83 | 1893 | if (inode && unlikely(inode->i_fsnotify_marks)) { |
74c3cbe3 | 1894 | struct audit_chunk *chunk; |
254c8b96 | 1895 | |
74c3cbe3 AV |
1896 | chunk = audit_tree_lookup(inode); |
1897 | if (chunk) { | |
1898 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1899 | drop = chunk; | |
1900 | break; | |
1901 | } | |
1902 | } | |
1903 | } | |
1904 | parent = d->d_parent; | |
1905 | if (parent == d) | |
1906 | break; | |
1907 | d = parent; | |
1908 | } | |
1909 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1910 | rcu_read_unlock(); | |
1911 | if (!drop) { | |
1912 | /* just a race with rename */ | |
1913 | unroll_tree_refs(context, p, count); | |
1914 | goto retry; | |
1915 | } | |
1916 | audit_put_chunk(drop); | |
1917 | if (grow_tree_refs(context)) { | |
1918 | /* OK, got more space */ | |
1919 | unroll_tree_refs(context, p, count); | |
1920 | goto retry; | |
1921 | } | |
1922 | /* too bad */ | |
f952d10f | 1923 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1924 | unroll_tree_refs(context, p, count); |
1925 | audit_set_auditable(context); | |
1926 | return; | |
1927 | } | |
1928 | rcu_read_unlock(); | |
74c3cbe3 AV |
1929 | } |
1930 | ||
78e2e802 JL |
1931 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1932 | unsigned char type) | |
5195d8e2 EP |
1933 | { |
1934 | struct audit_names *aname; | |
1935 | ||
1936 | if (context->name_count < AUDIT_NAMES) { | |
1937 | aname = &context->preallocated_names[context->name_count]; | |
1938 | memset(aname, 0, sizeof(*aname)); | |
1939 | } else { | |
1940 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1941 | if (!aname) | |
1942 | return NULL; | |
1943 | aname->should_free = true; | |
1944 | } | |
1945 | ||
84cb777e | 1946 | aname->ino = AUDIT_INO_UNSET; |
78e2e802 | 1947 | aname->type = type; |
5195d8e2 EP |
1948 | list_add_tail(&aname->list, &context->names_list); |
1949 | ||
1950 | context->name_count++; | |
6d915476 RGB |
1951 | if (!context->pwd.dentry) |
1952 | get_fs_pwd(current->fs, &context->pwd); | |
5195d8e2 EP |
1953 | return aname; |
1954 | } | |
1955 | ||
7ac86265 | 1956 | /** |
196a5085 | 1957 | * __audit_reusename - fill out filename with info from existing entry |
7ac86265 JL |
1958 | * @uptr: userland ptr to pathname |
1959 | * | |
1960 | * Search the audit_names list for the current audit context. If there is an | |
1961 | * existing entry with a matching "uptr" then return the filename | |
1962 | * associated with that audit_name. If not, return NULL. | |
1963 | */ | |
1964 | struct filename * | |
1965 | __audit_reusename(const __user char *uptr) | |
1966 | { | |
cdfb6b34 | 1967 | struct audit_context *context = audit_context(); |
7ac86265 JL |
1968 | struct audit_names *n; |
1969 | ||
1970 | list_for_each_entry(n, &context->names_list, list) { | |
1971 | if (!n->name) | |
1972 | continue; | |
55422d0b PM |
1973 | if (n->name->uptr == uptr) { |
1974 | n->name->refcnt++; | |
7ac86265 | 1975 | return n->name; |
55422d0b | 1976 | } |
7ac86265 JL |
1977 | } |
1978 | return NULL; | |
1979 | } | |
1980 | ||
b0dd25a8 | 1981 | /** |
196a5085 | 1982 | * __audit_getname - add a name to the list |
b0dd25a8 RD |
1983 | * @name: name to add |
1984 | * | |
1985 | * Add a name to the list of audit names for this context. | |
1986 | * Called from fs/namei.c:getname(). | |
1987 | */ | |
91a27b2a | 1988 | void __audit_getname(struct filename *name) |
1da177e4 | 1989 | { |
cdfb6b34 | 1990 | struct audit_context *context = audit_context(); |
5195d8e2 | 1991 | struct audit_names *n; |
1da177e4 | 1992 | |
55422d0b | 1993 | if (!context->in_syscall) |
1da177e4 | 1994 | return; |
91a27b2a | 1995 | |
78e2e802 | 1996 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
1997 | if (!n) |
1998 | return; | |
1999 | ||
2000 | n->name = name; | |
2001 | n->name_len = AUDIT_NAME_FULL; | |
adb5c247 | 2002 | name->aname = n; |
55422d0b | 2003 | name->refcnt++; |
1da177e4 LT |
2004 | } |
2005 | ||
5f3d544f RGB |
2006 | static inline int audit_copy_fcaps(struct audit_names *name, |
2007 | const struct dentry *dentry) | |
2008 | { | |
2009 | struct cpu_vfs_cap_data caps; | |
2010 | int rc; | |
2011 | ||
2012 | if (!dentry) | |
2013 | return 0; | |
2014 | ||
71bc356f | 2015 | rc = get_vfs_caps_from_disk(&init_user_ns, dentry, &caps); |
5f3d544f RGB |
2016 | if (rc) |
2017 | return rc; | |
2018 | ||
2019 | name->fcap.permitted = caps.permitted; | |
2020 | name->fcap.inheritable = caps.inheritable; | |
2021 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2022 | name->fcap.rootid = caps.rootid; | |
2023 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> | |
2024 | VFS_CAP_REVISION_SHIFT; | |
2025 | ||
2026 | return 0; | |
2027 | } | |
2028 | ||
2029 | /* Copy inode data into an audit_names. */ | |
2efa48fe Y |
2030 | static void audit_copy_inode(struct audit_names *name, |
2031 | const struct dentry *dentry, | |
2032 | struct inode *inode, unsigned int flags) | |
5f3d544f RGB |
2033 | { |
2034 | name->ino = inode->i_ino; | |
2035 | name->dev = inode->i_sb->s_dev; | |
2036 | name->mode = inode->i_mode; | |
2037 | name->uid = inode->i_uid; | |
2038 | name->gid = inode->i_gid; | |
2039 | name->rdev = inode->i_rdev; | |
558fd844 | 2040 | security_inode_getsecid(inode, &name->oblob); |
5f3d544f RGB |
2041 | if (flags & AUDIT_INODE_NOEVAL) { |
2042 | name->fcap_ver = -1; | |
2043 | return; | |
2044 | } | |
2045 | audit_copy_fcaps(name, dentry); | |
2046 | } | |
2047 | ||
b0dd25a8 | 2048 | /** |
bfcec708 | 2049 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 2050 | * @name: name being audited |
481968f4 | 2051 | * @dentry: dentry being audited |
79f6530c | 2052 | * @flags: attributes for this particular entry |
b0dd25a8 | 2053 | */ |
adb5c247 | 2054 | void __audit_inode(struct filename *name, const struct dentry *dentry, |
79f6530c | 2055 | unsigned int flags) |
1da177e4 | 2056 | { |
cdfb6b34 | 2057 | struct audit_context *context = audit_context(); |
d6335d77 | 2058 | struct inode *inode = d_backing_inode(dentry); |
5195d8e2 | 2059 | struct audit_names *n; |
79f6530c | 2060 | bool parent = flags & AUDIT_INODE_PARENT; |
a252f56a RGB |
2061 | struct audit_entry *e; |
2062 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
2063 | int i; | |
1da177e4 LT |
2064 | |
2065 | if (!context->in_syscall) | |
2066 | return; | |
5195d8e2 | 2067 | |
a252f56a | 2068 | rcu_read_lock(); |
699c1868 RGB |
2069 | list_for_each_entry_rcu(e, list, list) { |
2070 | for (i = 0; i < e->rule.field_count; i++) { | |
2071 | struct audit_field *f = &e->rule.fields[i]; | |
2072 | ||
2073 | if (f->type == AUDIT_FSTYPE | |
2074 | && audit_comparator(inode->i_sb->s_magic, | |
2075 | f->op, f->val) | |
2076 | && e->rule.action == AUDIT_NEVER) { | |
2077 | rcu_read_unlock(); | |
2078 | return; | |
a252f56a RGB |
2079 | } |
2080 | } | |
2081 | } | |
2082 | rcu_read_unlock(); | |
2083 | ||
9cec9d68 JL |
2084 | if (!name) |
2085 | goto out_alloc; | |
2086 | ||
adb5c247 JL |
2087 | /* |
2088 | * If we have a pointer to an audit_names entry already, then we can | |
2089 | * just use it directly if the type is correct. | |
2090 | */ | |
2091 | n = name->aname; | |
2092 | if (n) { | |
2093 | if (parent) { | |
2094 | if (n->type == AUDIT_TYPE_PARENT || | |
2095 | n->type == AUDIT_TYPE_UNKNOWN) | |
2096 | goto out; | |
2097 | } else { | |
2098 | if (n->type != AUDIT_TYPE_PARENT) | |
2099 | goto out; | |
2100 | } | |
2101 | } | |
2102 | ||
5195d8e2 | 2103 | list_for_each_entry_reverse(n, &context->names_list, list) { |
57c59f58 PM |
2104 | if (n->ino) { |
2105 | /* valid inode number, use that for the comparison */ | |
2106 | if (n->ino != inode->i_ino || | |
2107 | n->dev != inode->i_sb->s_dev) | |
2108 | continue; | |
2109 | } else if (n->name) { | |
2110 | /* inode number has not been set, check the name */ | |
2111 | if (strcmp(n->name->name, name->name)) | |
2112 | continue; | |
2113 | } else | |
2114 | /* no inode and no name (?!) ... this is odd ... */ | |
bfcec708 JL |
2115 | continue; |
2116 | ||
2117 | /* match the correct record type */ | |
2118 | if (parent) { | |
2119 | if (n->type == AUDIT_TYPE_PARENT || | |
2120 | n->type == AUDIT_TYPE_UNKNOWN) | |
2121 | goto out; | |
2122 | } else { | |
2123 | if (n->type != AUDIT_TYPE_PARENT) | |
2124 | goto out; | |
2125 | } | |
1da177e4 | 2126 | } |
5195d8e2 | 2127 | |
9cec9d68 | 2128 | out_alloc: |
4a928436 PM |
2129 | /* unable to find an entry with both a matching name and type */ |
2130 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); | |
5195d8e2 EP |
2131 | if (!n) |
2132 | return; | |
fcf22d82 | 2133 | if (name) { |
fd3522fd | 2134 | n->name = name; |
55422d0b | 2135 | name->refcnt++; |
fcf22d82 | 2136 | } |
4a928436 | 2137 | |
5195d8e2 | 2138 | out: |
bfcec708 | 2139 | if (parent) { |
91a27b2a | 2140 | n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec708 | 2141 | n->type = AUDIT_TYPE_PARENT; |
79f6530c JL |
2142 | if (flags & AUDIT_INODE_HIDDEN) |
2143 | n->hidden = true; | |
bfcec708 JL |
2144 | } else { |
2145 | n->name_len = AUDIT_NAME_FULL; | |
2146 | n->type = AUDIT_TYPE_NORMAL; | |
2147 | } | |
74c3cbe3 | 2148 | handle_path(dentry); |
57d46577 | 2149 | audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL); |
73241ccc AG |
2150 | } |
2151 | ||
9f45f5bf AV |
2152 | void __audit_file(const struct file *file) |
2153 | { | |
2154 | __audit_inode(NULL, file->f_path.dentry, 0); | |
2155 | } | |
2156 | ||
73241ccc | 2157 | /** |
c43a25ab | 2158 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 2159 | * @parent: inode of dentry parent |
c43a25ab | 2160 | * @dentry: dentry being audited |
4fa6b5ec | 2161 | * @type: AUDIT_TYPE_* value that we're looking for |
73241ccc AG |
2162 | * |
2163 | * For syscalls that create or remove filesystem objects, audit_inode | |
2164 | * can only collect information for the filesystem object's parent. | |
2165 | * This call updates the audit context with the child's information. | |
2166 | * Syscalls that create a new filesystem object must be hooked after | |
2167 | * the object is created. Syscalls that remove a filesystem object | |
2168 | * must be hooked prior, in order to capture the target inode during | |
2169 | * unsuccessful attempts. | |
2170 | */ | |
d6335d77 | 2171 | void __audit_inode_child(struct inode *parent, |
4fa6b5ec JL |
2172 | const struct dentry *dentry, |
2173 | const unsigned char type) | |
73241ccc | 2174 | { |
cdfb6b34 | 2175 | struct audit_context *context = audit_context(); |
d6335d77 | 2176 | struct inode *inode = d_backing_inode(dentry); |
795d673a | 2177 | const struct qstr *dname = &dentry->d_name; |
4fa6b5ec | 2178 | struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
42d5e376 RGB |
2179 | struct audit_entry *e; |
2180 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
2181 | int i; | |
73241ccc AG |
2182 | |
2183 | if (!context->in_syscall) | |
2184 | return; | |
2185 | ||
42d5e376 | 2186 | rcu_read_lock(); |
699c1868 RGB |
2187 | list_for_each_entry_rcu(e, list, list) { |
2188 | for (i = 0; i < e->rule.field_count; i++) { | |
2189 | struct audit_field *f = &e->rule.fields[i]; | |
2190 | ||
2191 | if (f->type == AUDIT_FSTYPE | |
2192 | && audit_comparator(parent->i_sb->s_magic, | |
2193 | f->op, f->val) | |
2194 | && e->rule.action == AUDIT_NEVER) { | |
2195 | rcu_read_unlock(); | |
2196 | return; | |
42d5e376 RGB |
2197 | } |
2198 | } | |
2199 | } | |
2200 | rcu_read_unlock(); | |
2201 | ||
74c3cbe3 AV |
2202 | if (inode) |
2203 | handle_one(inode); | |
73241ccc | 2204 | |
4fa6b5ec | 2205 | /* look for a parent entry first */ |
5195d8e2 | 2206 | list_for_each_entry(n, &context->names_list, list) { |
57c59f58 PM |
2207 | if (!n->name || |
2208 | (n->type != AUDIT_TYPE_PARENT && | |
2209 | n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
2210 | continue; |
2211 | ||
57c59f58 PM |
2212 | if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev && |
2213 | !audit_compare_dname_path(dname, | |
2214 | n->name->name, n->name_len)) { | |
2215 | if (n->type == AUDIT_TYPE_UNKNOWN) | |
2216 | n->type = AUDIT_TYPE_PARENT; | |
4fa6b5ec JL |
2217 | found_parent = n; |
2218 | break; | |
f368c07d | 2219 | } |
5712e88f | 2220 | } |
73241ccc | 2221 | |
4fa6b5ec | 2222 | /* is there a matching child entry? */ |
5195d8e2 | 2223 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec | 2224 | /* can only match entries that have a name */ |
57c59f58 PM |
2225 | if (!n->name || |
2226 | (n->type != type && n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
2227 | continue; |
2228 | ||
795d673a | 2229 | if (!strcmp(dname->name, n->name->name) || |
91a27b2a | 2230 | !audit_compare_dname_path(dname, n->name->name, |
4fa6b5ec JL |
2231 | found_parent ? |
2232 | found_parent->name_len : | |
e3d6b07b | 2233 | AUDIT_NAME_FULL)) { |
57c59f58 PM |
2234 | if (n->type == AUDIT_TYPE_UNKNOWN) |
2235 | n->type = type; | |
4fa6b5ec JL |
2236 | found_child = n; |
2237 | break; | |
5712e88f | 2238 | } |
ac9910ce | 2239 | } |
5712e88f | 2240 | |
5712e88f | 2241 | if (!found_parent) { |
4fa6b5ec JL |
2242 | /* create a new, "anonymous" parent record */ |
2243 | n = audit_alloc_name(context, AUDIT_TYPE_PARENT); | |
5195d8e2 | 2244 | if (!n) |
ac9910ce | 2245 | return; |
57d46577 | 2246 | audit_copy_inode(n, NULL, parent, 0); |
73d3ec5a | 2247 | } |
5712e88f AG |
2248 | |
2249 | if (!found_child) { | |
4fa6b5ec JL |
2250 | found_child = audit_alloc_name(context, type); |
2251 | if (!found_child) | |
5712e88f | 2252 | return; |
5712e88f AG |
2253 | |
2254 | /* Re-use the name belonging to the slot for a matching parent | |
2255 | * directory. All names for this context are relinquished in | |
2256 | * audit_free_names() */ | |
2257 | if (found_parent) { | |
4fa6b5ec JL |
2258 | found_child->name = found_parent->name; |
2259 | found_child->name_len = AUDIT_NAME_FULL; | |
55422d0b | 2260 | found_child->name->refcnt++; |
5712e88f | 2261 | } |
5712e88f | 2262 | } |
57c59f58 | 2263 | |
4fa6b5ec | 2264 | if (inode) |
57d46577 | 2265 | audit_copy_inode(found_child, dentry, inode, 0); |
4fa6b5ec | 2266 | else |
84cb777e | 2267 | found_child->ino = AUDIT_INO_UNSET; |
3e2efce0 | 2268 | } |
50e437d5 | 2269 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2270 | |
85ff5379 CS |
2271 | /** |
2272 | * audit_stamp_context - set the timestamp+serial in an audit context | |
2273 | * @ctx: audit_context to set | |
2274 | */ | |
2275 | void audit_stamp_context(struct audit_context *ctx) | |
2276 | { | |
2277 | /* ctx will be NULL unless lsm_multiple_contexts() is true */ | |
2278 | if (!ctx) | |
2279 | return; | |
2280 | ||
2281 | ktime_get_coarse_real_ts64(&ctx->ctime); | |
2282 | ctx->serial = audit_serial(); | |
2283 | ctx->current_state = AUDIT_STATE_BUILD; | |
2284 | } | |
2285 | ||
b0dd25a8 RD |
2286 | /** |
2287 | * auditsc_get_stamp - get local copies of audit_context values | |
2288 | * @ctx: audit_context for the task | |
2115bb25 | 2289 | * @t: timespec64 to store time recorded in the audit_context |
b0dd25a8 RD |
2290 | * @serial: serial value that is recorded in the audit_context |
2291 | * | |
2292 | * Also sets the context as auditable. | |
2293 | */ | |
48887e63 | 2294 | int auditsc_get_stamp(struct audit_context *ctx, |
2115bb25 | 2295 | struct timespec64 *t, unsigned int *serial) |
1da177e4 | 2296 | { |
85ff5379 CS |
2297 | if (ctx->serial && !ctx->in_syscall) { |
2298 | t->tv_sec = ctx->ctime.tv_sec; | |
2299 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2300 | *serial = ctx->serial; | |
2301 | return 1; | |
2302 | } | |
48887e63 AV |
2303 | if (!ctx->in_syscall) |
2304 | return 0; | |
ce625a80 DW |
2305 | if (!ctx->serial) |
2306 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2307 | t->tv_sec = ctx->ctime.tv_sec; |
2308 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2309 | *serial = ctx->serial; | |
0590b933 AV |
2310 | if (!ctx->prio) { |
2311 | ctx->prio = 1; | |
619ed58a | 2312 | ctx->current_state = AUDIT_STATE_RECORD; |
0590b933 | 2313 | } |
48887e63 | 2314 | return 1; |
1da177e4 LT |
2315 | } |
2316 | ||
20ca73bc GW |
2317 | /** |
2318 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2319 | * @oflag: open flag | |
2320 | * @mode: mode bits | |
6b962559 | 2321 | * @attr: queue attributes |
20ca73bc | 2322 | * |
20ca73bc | 2323 | */ |
df0a4283 | 2324 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2325 | { |
cdfb6b34 | 2326 | struct audit_context *context = audit_context(); |
20ca73bc | 2327 | |
564f6993 AV |
2328 | if (attr) |
2329 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2330 | else | |
2331 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2332 | |
564f6993 AV |
2333 | context->mq_open.oflag = oflag; |
2334 | context->mq_open.mode = mode; | |
20ca73bc | 2335 | |
564f6993 | 2336 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2337 | } |
2338 | ||
2339 | /** | |
c32c8af4 | 2340 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2341 | * @mqdes: MQ descriptor |
2342 | * @msg_len: Message length | |
2343 | * @msg_prio: Message priority | |
c32c8af4 | 2344 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2345 | * |
20ca73bc | 2346 | */ |
c32c8af4 | 2347 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
b9047726 | 2348 | const struct timespec64 *abs_timeout) |
20ca73bc | 2349 | { |
cdfb6b34 | 2350 | struct audit_context *context = audit_context(); |
b9047726 | 2351 | struct timespec64 *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2352 | |
c32c8af4 | 2353 | if (abs_timeout) |
b9047726 | 2354 | memcpy(p, abs_timeout, sizeof(*p)); |
c32c8af4 | 2355 | else |
b9047726 | 2356 | memset(p, 0, sizeof(*p)); |
20ca73bc | 2357 | |
c32c8af4 AV |
2358 | context->mq_sendrecv.mqdes = mqdes; |
2359 | context->mq_sendrecv.msg_len = msg_len; | |
2360 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2361 | |
c32c8af4 | 2362 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2363 | } |
2364 | ||
2365 | /** | |
2366 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2367 | * @mqdes: MQ descriptor | |
6b962559 | 2368 | * @notification: Notification event |
20ca73bc | 2369 | * |
20ca73bc GW |
2370 | */ |
2371 | ||
20114f71 | 2372 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2373 | { |
cdfb6b34 | 2374 | struct audit_context *context = audit_context(); |
20ca73bc | 2375 | |
20114f71 AV |
2376 | if (notification) |
2377 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2378 | else | |
2379 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2380 | |
20114f71 AV |
2381 | context->mq_notify.mqdes = mqdes; |
2382 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2383 | } |
2384 | ||
2385 | /** | |
2386 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2387 | * @mqdes: MQ descriptor | |
2388 | * @mqstat: MQ flags | |
2389 | * | |
20ca73bc | 2390 | */ |
7392906e | 2391 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2392 | { |
cdfb6b34 | 2393 | struct audit_context *context = audit_context(); |
254c8b96 | 2394 | |
7392906e AV |
2395 | context->mq_getsetattr.mqdes = mqdes; |
2396 | context->mq_getsetattr.mqstat = *mqstat; | |
2397 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2398 | } |
2399 | ||
b0dd25a8 | 2400 | /** |
196a5085 | 2401 | * __audit_ipc_obj - record audit data for ipc object |
073115d6 SG |
2402 | * @ipcp: ipc permissions |
2403 | * | |
073115d6 | 2404 | */ |
a33e6751 | 2405 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2406 | { |
cdfb6b34 | 2407 | struct audit_context *context = audit_context(); |
a33e6751 AV |
2408 | context->ipc.uid = ipcp->uid; |
2409 | context->ipc.gid = ipcp->gid; | |
2410 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2411 | context->ipc.has_perm = 0; |
558fd844 | 2412 | security_ipc_getsecid(ipcp, &context->ipc.oblob); |
a33e6751 | 2413 | context->type = AUDIT_IPC; |
073115d6 SG |
2414 | } |
2415 | ||
2416 | /** | |
196a5085 | 2417 | * __audit_ipc_set_perm - record audit data for new ipc permissions |
b0dd25a8 RD |
2418 | * @qbytes: msgq bytes |
2419 | * @uid: msgq user id | |
2420 | * @gid: msgq group id | |
2421 | * @mode: msgq mode (permissions) | |
2422 | * | |
e816f370 | 2423 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2424 | */ |
2570ebbd | 2425 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2426 | { |
cdfb6b34 | 2427 | struct audit_context *context = audit_context(); |
1da177e4 | 2428 | |
e816f370 AV |
2429 | context->ipc.qbytes = qbytes; |
2430 | context->ipc.perm_uid = uid; | |
2431 | context->ipc.perm_gid = gid; | |
2432 | context->ipc.perm_mode = mode; | |
2433 | context->ipc.has_perm = 1; | |
1da177e4 | 2434 | } |
c2f0c7c3 | 2435 | |
d9cfea91 | 2436 | void __audit_bprm(struct linux_binprm *bprm) |
473ae30b | 2437 | { |
cdfb6b34 | 2438 | struct audit_context *context = audit_context(); |
473ae30b | 2439 | |
d9cfea91 RGB |
2440 | context->type = AUDIT_EXECVE; |
2441 | context->execve.argc = bprm->argc; | |
473ae30b AV |
2442 | } |
2443 | ||
2444 | ||
b0dd25a8 | 2445 | /** |
196a5085 | 2446 | * __audit_socketcall - record audit data for sys_socketcall |
2950fa9d | 2447 | * @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a8 RD |
2448 | * @args: args array |
2449 | * | |
b0dd25a8 | 2450 | */ |
2950fa9d | 2451 | int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2452 | { |
cdfb6b34 | 2453 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2454 | |
2950fa9d CG |
2455 | if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) |
2456 | return -EINVAL; | |
f3298dc4 AV |
2457 | context->type = AUDIT_SOCKETCALL; |
2458 | context->socketcall.nargs = nargs; | |
2459 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
2950fa9d | 2460 | return 0; |
3ec3b2fb DW |
2461 | } |
2462 | ||
db349509 AV |
2463 | /** |
2464 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2465 | * @fd1: the first file descriptor | |
2466 | * @fd2: the second file descriptor | |
2467 | * | |
db349509 | 2468 | */ |
157cf649 | 2469 | void __audit_fd_pair(int fd1, int fd2) |
db349509 | 2470 | { |
cdfb6b34 | 2471 | struct audit_context *context = audit_context(); |
254c8b96 | 2472 | |
157cf649 AV |
2473 | context->fds[0] = fd1; |
2474 | context->fds[1] = fd2; | |
db349509 AV |
2475 | } |
2476 | ||
b0dd25a8 | 2477 | /** |
196a5085 | 2478 | * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto |
b0dd25a8 RD |
2479 | * @len: data length in user space |
2480 | * @a: data address in kernel space | |
2481 | * | |
2482 | * Returns 0 for success or NULL context or < 0 on error. | |
2483 | */ | |
07c49417 | 2484 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2485 | { |
cdfb6b34 | 2486 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2487 | |
4f6b434f AV |
2488 | if (!context->sockaddr) { |
2489 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
254c8b96 | 2490 | |
4f6b434f AV |
2491 | if (!p) |
2492 | return -ENOMEM; | |
2493 | context->sockaddr = p; | |
2494 | } | |
3ec3b2fb | 2495 | |
4f6b434f AV |
2496 | context->sockaddr_len = len; |
2497 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2498 | return 0; |
2499 | } | |
2500 | ||
a5cb013d AV |
2501 | void __audit_ptrace(struct task_struct *t) |
2502 | { | |
cdfb6b34 | 2503 | struct audit_context *context = audit_context(); |
a5cb013d | 2504 | |
fa2bea2f | 2505 | context->target_pid = task_tgid_nr(t); |
c2a7780e | 2506 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2507 | context->target_uid = task_uid(t); |
4746ec5b | 2508 | context->target_sessionid = audit_get_sessionid(t); |
36fd78ba | 2509 | security_task_getsecid_obj(t, &context->target_lsm); |
c2a7780e | 2510 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2511 | } |
2512 | ||
b0dd25a8 | 2513 | /** |
b48345aa | 2514 | * audit_signal_info_syscall - record signal info for syscalls |
b0dd25a8 RD |
2515 | * @t: task being signaled |
2516 | * | |
2517 | * If the audit subsystem is being terminated, record the task (pid) | |
2518 | * and uid that is doing that. | |
2519 | */ | |
b48345aa | 2520 | int audit_signal_info_syscall(struct task_struct *t) |
c2f0c7c3 | 2521 | { |
e54dc243 | 2522 | struct audit_aux_data_pids *axp; |
cdfb6b34 | 2523 | struct audit_context *ctx = audit_context(); |
b48345aa | 2524 | kuid_t t_uid = task_uid(t); |
e54dc243 | 2525 | |
ab6434a1 PM |
2526 | if (!audit_signals || audit_dummy_context()) |
2527 | return 0; | |
2528 | ||
e54dc243 AG |
2529 | /* optimize the common case by putting first signal recipient directly |
2530 | * in audit_context */ | |
2531 | if (!ctx->target_pid) { | |
f1dc4867 | 2532 | ctx->target_pid = task_tgid_nr(t); |
c2a7780e | 2533 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2534 | ctx->target_uid = t_uid; |
4746ec5b | 2535 | ctx->target_sessionid = audit_get_sessionid(t); |
36fd78ba | 2536 | security_task_getsecid_obj(t, &ctx->target_lsm); |
c2a7780e | 2537 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2538 | return 0; |
2539 | } | |
2540 | ||
2541 | axp = (void *)ctx->aux_pids; | |
2542 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2543 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2544 | if (!axp) | |
2545 | return -ENOMEM; | |
2546 | ||
2547 | axp->d.type = AUDIT_OBJ_PID; | |
2548 | axp->d.next = ctx->aux_pids; | |
2549 | ctx->aux_pids = (void *)axp; | |
2550 | } | |
88ae704c | 2551 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 | 2552 | |
f1dc4867 | 2553 | axp->target_pid[axp->pid_count] = task_tgid_nr(t); |
c2a7780e | 2554 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2555 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2556 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
36fd78ba | 2557 | security_task_getsecid_obj(t, &axp->target_lsm[axp->pid_count]); |
c2a7780e | 2558 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2559 | axp->pid_count++; |
2560 | ||
2561 | return 0; | |
c2f0c7c3 | 2562 | } |
0a4ff8c2 | 2563 | |
3fc689e9 EP |
2564 | /** |
2565 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2566 | * @bprm: pointer to the bprm being processed |
2567 | * @new: the proposed new credentials | |
2568 | * @old: the old credentials | |
3fc689e9 EP |
2569 | * |
2570 | * Simply check if the proc already has the caps given by the file and if not | |
2571 | * store the priv escalation info for later auditing at the end of the syscall | |
2572 | * | |
3fc689e9 EP |
2573 | * -Eric |
2574 | */ | |
d84f4f99 DH |
2575 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2576 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2577 | { |
2578 | struct audit_aux_data_bprm_fcaps *ax; | |
cdfb6b34 | 2579 | struct audit_context *context = audit_context(); |
3fc689e9 | 2580 | struct cpu_vfs_cap_data vcaps; |
3fc689e9 EP |
2581 | |
2582 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2583 | if (!ax) | |
d84f4f99 | 2584 | return -ENOMEM; |
3fc689e9 EP |
2585 | |
2586 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2587 | ax->d.next = context->aux; | |
2588 | context->aux = (void *)ax; | |
2589 | ||
71bc356f CB |
2590 | get_vfs_caps_from_disk(&init_user_ns, |
2591 | bprm->file->f_path.dentry, &vcaps); | |
3fc689e9 EP |
2592 | |
2593 | ax->fcap.permitted = vcaps.permitted; | |
2594 | ax->fcap.inheritable = vcaps.inheritable; | |
2595 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2fec30e2 | 2596 | ax->fcap.rootid = vcaps.rootid; |
3fc689e9 EP |
2597 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; |
2598 | ||
d84f4f99 DH |
2599 | ax->old_pcap.permitted = old->cap_permitted; |
2600 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2601 | ax->old_pcap.effective = old->cap_effective; | |
7786f6b6 | 2602 | ax->old_pcap.ambient = old->cap_ambient; |
3fc689e9 | 2603 | |
d84f4f99 DH |
2604 | ax->new_pcap.permitted = new->cap_permitted; |
2605 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2606 | ax->new_pcap.effective = new->cap_effective; | |
7786f6b6 | 2607 | ax->new_pcap.ambient = new->cap_ambient; |
d84f4f99 | 2608 | return 0; |
3fc689e9 EP |
2609 | } |
2610 | ||
e68b75a0 EP |
2611 | /** |
2612 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2613 | * @new: the new credentials |
2614 | * @old: the old (current) credentials | |
e68b75a0 | 2615 | * |
da3dae54 | 2616 | * Record the arguments userspace sent to sys_capset for later printing by the |
e68b75a0 EP |
2617 | * audit system if applicable |
2618 | */ | |
ca24a23e | 2619 | void __audit_log_capset(const struct cred *new, const struct cred *old) |
e68b75a0 | 2620 | { |
cdfb6b34 | 2621 | struct audit_context *context = audit_context(); |
254c8b96 | 2622 | |
fa2bea2f | 2623 | context->capset.pid = task_tgid_nr(current); |
57f71a0a AV |
2624 | context->capset.cap.effective = new->cap_effective; |
2625 | context->capset.cap.inheritable = new->cap_effective; | |
2626 | context->capset.cap.permitted = new->cap_permitted; | |
7786f6b6 | 2627 | context->capset.cap.ambient = new->cap_ambient; |
57f71a0a | 2628 | context->type = AUDIT_CAPSET; |
e68b75a0 EP |
2629 | } |
2630 | ||
120a795d AV |
2631 | void __audit_mmap_fd(int fd, int flags) |
2632 | { | |
cdfb6b34 | 2633 | struct audit_context *context = audit_context(); |
254c8b96 | 2634 | |
120a795d AV |
2635 | context->mmap.fd = fd; |
2636 | context->mmap.flags = flags; | |
2637 | context->type = AUDIT_MMAP; | |
2638 | } | |
2639 | ||
ca86cad7 RGB |
2640 | void __audit_log_kern_module(char *name) |
2641 | { | |
cdfb6b34 | 2642 | struct audit_context *context = audit_context(); |
ca86cad7 | 2643 | |
b305f7ed YW |
2644 | context->module.name = kstrdup(name, GFP_KERNEL); |
2645 | if (!context->module.name) | |
2646 | audit_log_lost("out of memory in __audit_log_kern_module"); | |
ca86cad7 RGB |
2647 | context->type = AUDIT_KERN_MODULE; |
2648 | } | |
2649 | ||
de8cd83e SG |
2650 | void __audit_fanotify(unsigned int response) |
2651 | { | |
cdfb6b34 | 2652 | audit_log(audit_context(), GFP_KERNEL, |
de8cd83e SG |
2653 | AUDIT_FANOTIFY, "resp=%u", response); |
2654 | } | |
2655 | ||
2d87a067 OM |
2656 | void __audit_tk_injoffset(struct timespec64 offset) |
2657 | { | |
dc4607d9 | 2658 | struct audit_context *context = audit_context(); |
7e8eda73 | 2659 | |
dc4607d9 RGB |
2660 | /* only set type if not already set by NTP */ |
2661 | if (!context->type) | |
2662 | context->type = AUDIT_TIME_INJOFFSET; | |
2663 | memcpy(&context->time.tk_injoffset, &offset, sizeof(offset)); | |
7e8eda73 OM |
2664 | } |
2665 | ||
2666 | void __audit_ntp_log(const struct audit_ntp_data *ad) | |
2667 | { | |
dc4607d9 RGB |
2668 | struct audit_context *context = audit_context(); |
2669 | int type; | |
2670 | ||
2671 | for (type = 0; type < AUDIT_NTP_NVALS; type++) | |
2672 | if (ad->vals[type].newval != ad->vals[type].oldval) { | |
2673 | /* unconditionally set type, overwriting TK */ | |
2674 | context->type = AUDIT_TIME_ADJNTPVAL; | |
2675 | memcpy(&context->time.ntp_data, ad, sizeof(*ad)); | |
2676 | break; | |
2677 | } | |
7e8eda73 OM |
2678 | } |
2679 | ||
c4dad0aa | 2680 | void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, |
14224039 | 2681 | enum audit_nfcfgop op, gfp_t gfp) |
c4dad0aa RGB |
2682 | { |
2683 | struct audit_buffer *ab; | |
9d44a121 | 2684 | char comm[sizeof(current->comm)]; |
c4dad0aa | 2685 | |
14224039 | 2686 | ab = audit_log_start(audit_context(), gfp, AUDIT_NETFILTER_CFG); |
c4dad0aa RGB |
2687 | if (!ab) |
2688 | return; | |
2689 | audit_log_format(ab, "table=%s family=%u entries=%u op=%s", | |
2690 | name, af, nentries, audit_nfcfgs[op].s); | |
9d44a121 RGB |
2691 | |
2692 | audit_log_format(ab, " pid=%u", task_pid_nr(current)); | |
85ff5379 | 2693 | audit_log_task_context(ab, NULL); /* subj= */ |
9d44a121 RGB |
2694 | audit_log_format(ab, " comm="); |
2695 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); | |
c4dad0aa RGB |
2696 | audit_log_end(ab); |
2697 | } | |
2698 | EXPORT_SYMBOL_GPL(__audit_log_nfcfg); | |
2699 | ||
7b9205bd | 2700 | static void audit_log_task(struct audit_buffer *ab) |
85e7bac3 | 2701 | { |
cca080d9 EB |
2702 | kuid_t auid, uid; |
2703 | kgid_t gid; | |
85e7bac3 | 2704 | unsigned int sessionid; |
9eab339b | 2705 | char comm[sizeof(current->comm)]; |
85e7bac3 EP |
2706 | |
2707 | auid = audit_get_loginuid(current); | |
2708 | sessionid = audit_get_sessionid(current); | |
2709 | current_uid_gid(&uid, &gid); | |
2710 | ||
2711 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2712 | from_kuid(&init_user_ns, auid), |
2713 | from_kuid(&init_user_ns, uid), | |
2714 | from_kgid(&init_user_ns, gid), | |
2715 | sessionid); | |
85ff5379 | 2716 | audit_log_task_context(ab, NULL); |
fa2bea2f | 2717 | audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); |
9eab339b | 2718 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); |
4766b199 | 2719 | audit_log_d_path_exe(ab, current->mm); |
7b9205bd KC |
2720 | } |
2721 | ||
0a4ff8c2 SG |
2722 | /** |
2723 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2724 | * @signr: signal value |
0a4ff8c2 SG |
2725 | * |
2726 | * If a process ends with a core dump, something fishy is going on and we | |
2727 | * should record the event for investigation. | |
2728 | */ | |
2729 | void audit_core_dumps(long signr) | |
2730 | { | |
2731 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2732 | |
2733 | if (!audit_enabled) | |
2734 | return; | |
2735 | ||
2736 | if (signr == SIGQUIT) /* don't care for those */ | |
2737 | return; | |
2738 | ||
85ff5379 | 2739 | audit_stamp_context(audit_context()); |
d87de4a8 | 2740 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND); |
0644ec0c KC |
2741 | if (unlikely(!ab)) |
2742 | return; | |
61c0ee87 | 2743 | audit_log_task(ab); |
89670aff | 2744 | audit_log_format(ab, " sig=%ld res=1", signr); |
85ff5379 | 2745 | audit_log_lsm(NULL, true); |
85e7bac3 EP |
2746 | audit_log_end(ab); |
2747 | } | |
0a4ff8c2 | 2748 | |
326bee02 TH |
2749 | /** |
2750 | * audit_seccomp - record information about a seccomp action | |
2751 | * @syscall: syscall number | |
2752 | * @signr: signal value | |
2753 | * @code: the seccomp action | |
2754 | * | |
2755 | * Record the information associated with a seccomp action. Event filtering for | |
2756 | * seccomp actions that are not to be logged is done in seccomp_log(). | |
2757 | * Therefore, this function forces auditing independent of the audit_enabled | |
2758 | * and dummy context state because seccomp actions should be logged even when | |
2759 | * audit is not in use. | |
2760 | */ | |
2761 | void audit_seccomp(unsigned long syscall, long signr, int code) | |
85e7bac3 EP |
2762 | { |
2763 | struct audit_buffer *ab; | |
2764 | ||
9b8753ff | 2765 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP); |
7b9205bd KC |
2766 | if (unlikely(!ab)) |
2767 | return; | |
2768 | audit_log_task(ab); | |
84db564a | 2769 | audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x", |
16add411 | 2770 | signr, syscall_get_arch(current), syscall, |
efbc0fbf | 2771 | in_compat_syscall(), KSTK_EIP(current), code); |
0a4ff8c2 SG |
2772 | audit_log_end(ab); |
2773 | } | |
916d7576 | 2774 | |
ea6eca77 TH |
2775 | void audit_seccomp_actions_logged(const char *names, const char *old_names, |
2776 | int res) | |
2777 | { | |
2778 | struct audit_buffer *ab; | |
2779 | ||
2780 | if (!audit_enabled) | |
2781 | return; | |
2782 | ||
8982a1fb | 2783 | ab = audit_log_start(audit_context(), GFP_KERNEL, |
ea6eca77 TH |
2784 | AUDIT_CONFIG_CHANGE); |
2785 | if (unlikely(!ab)) | |
2786 | return; | |
2787 | ||
d0a3f18a PM |
2788 | audit_log_format(ab, |
2789 | "op=seccomp-logging actions=%s old-actions=%s res=%d", | |
2790 | names, old_names, res); | |
ea6eca77 TH |
2791 | audit_log_end(ab); |
2792 | } | |
2793 | ||
916d7576 AV |
2794 | struct list_head *audit_killed_trees(void) |
2795 | { | |
cdfb6b34 | 2796 | struct audit_context *ctx = audit_context(); |
254c8b96 | 2797 | |
916d7576 AV |
2798 | if (likely(!ctx || !ctx->in_syscall)) |
2799 | return NULL; | |
2800 | return &ctx->killed_trees; | |
2801 | } |