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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 | ||
105 | #define AUDIT_AUX_IPCPERM 0 | |
106 | ||
e54dc243 AG |
107 | /* Number of target pids per aux struct. */ |
108 | #define AUDIT_AUX_PIDS 16 | |
109 | ||
e54dc243 AG |
110 | struct audit_aux_data_pids { |
111 | struct audit_aux_data d; | |
112 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
e1760bd5 | 113 | kuid_t target_auid[AUDIT_AUX_PIDS]; |
cca080d9 | 114 | kuid_t target_uid[AUDIT_AUX_PIDS]; |
4746ec5b | 115 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 116 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 117 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
118 | int pid_count; |
119 | }; | |
120 | ||
3fc689e9 EP |
121 | struct audit_aux_data_bprm_fcaps { |
122 | struct audit_aux_data d; | |
123 | struct audit_cap_data fcap; | |
124 | unsigned int fcap_ver; | |
125 | struct audit_cap_data old_pcap; | |
126 | struct audit_cap_data new_pcap; | |
127 | }; | |
128 | ||
74c3cbe3 AV |
129 | struct audit_tree_refs { |
130 | struct audit_tree_refs *next; | |
131 | struct audit_chunk *c[31]; | |
132 | }; | |
133 | ||
c4dad0aa RGB |
134 | struct audit_nfcfgop_tab { |
135 | enum audit_nfcfgop op; | |
136 | const char *s; | |
137 | }; | |
138 | ||
db9ff6ec | 139 | static const struct audit_nfcfgop_tab audit_nfcfgs[] = { |
8e6cf365 RGB |
140 | { AUDIT_XT_OP_REGISTER, "xt_register" }, |
141 | { AUDIT_XT_OP_REPLACE, "xt_replace" }, | |
142 | { AUDIT_XT_OP_UNREGISTER, "xt_unregister" }, | |
143 | { AUDIT_NFT_OP_TABLE_REGISTER, "nft_register_table" }, | |
144 | { AUDIT_NFT_OP_TABLE_UNREGISTER, "nft_unregister_table" }, | |
145 | { AUDIT_NFT_OP_CHAIN_REGISTER, "nft_register_chain" }, | |
146 | { AUDIT_NFT_OP_CHAIN_UNREGISTER, "nft_unregister_chain" }, | |
147 | { AUDIT_NFT_OP_RULE_REGISTER, "nft_register_rule" }, | |
148 | { AUDIT_NFT_OP_RULE_UNREGISTER, "nft_unregister_rule" }, | |
149 | { AUDIT_NFT_OP_SET_REGISTER, "nft_register_set" }, | |
150 | { AUDIT_NFT_OP_SET_UNREGISTER, "nft_unregister_set" }, | |
151 | { AUDIT_NFT_OP_SETELEM_REGISTER, "nft_register_setelem" }, | |
152 | { AUDIT_NFT_OP_SETELEM_UNREGISTER, "nft_unregister_setelem" }, | |
153 | { AUDIT_NFT_OP_GEN_REGISTER, "nft_register_gen" }, | |
154 | { AUDIT_NFT_OP_OBJ_REGISTER, "nft_register_obj" }, | |
155 | { AUDIT_NFT_OP_OBJ_UNREGISTER, "nft_unregister_obj" }, | |
156 | { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" }, | |
157 | { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" }, | |
158 | { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" }, | |
159 | { AUDIT_NFT_OP_INVALID, "nft_invalid" }, | |
c4dad0aa RGB |
160 | }; |
161 | ||
55669bfa AV |
162 | static int audit_match_perm(struct audit_context *ctx, int mask) |
163 | { | |
c4bacefb | 164 | unsigned n; |
1a61c88d | 165 | if (unlikely(!ctx)) |
166 | return 0; | |
c4bacefb | 167 | n = ctx->major; |
dbda4c0b | 168 | |
55669bfa AV |
169 | switch (audit_classify_syscall(ctx->arch, n)) { |
170 | case 0: /* native */ | |
171 | if ((mask & AUDIT_PERM_WRITE) && | |
172 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
173 | return 1; | |
174 | if ((mask & AUDIT_PERM_READ) && | |
175 | audit_match_class(AUDIT_CLASS_READ, n)) | |
176 | return 1; | |
177 | if ((mask & AUDIT_PERM_ATTR) && | |
178 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
179 | return 1; | |
180 | return 0; | |
181 | case 1: /* 32bit on biarch */ | |
182 | if ((mask & AUDIT_PERM_WRITE) && | |
183 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
184 | return 1; | |
185 | if ((mask & AUDIT_PERM_READ) && | |
186 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
187 | return 1; | |
188 | if ((mask & AUDIT_PERM_ATTR) && | |
189 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
190 | return 1; | |
191 | return 0; | |
192 | case 2: /* open */ | |
193 | return mask & ACC_MODE(ctx->argv[1]); | |
194 | case 3: /* openat */ | |
195 | return mask & ACC_MODE(ctx->argv[2]); | |
196 | case 4: /* socketcall */ | |
197 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
198 | case 5: /* execve */ | |
199 | return mask & AUDIT_PERM_EXEC; | |
200 | default: | |
201 | return 0; | |
202 | } | |
203 | } | |
204 | ||
5ef30ee5 | 205 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 206 | { |
5195d8e2 | 207 | struct audit_names *n; |
5ef30ee5 | 208 | umode_t mode = (umode_t)val; |
1a61c88d | 209 | |
210 | if (unlikely(!ctx)) | |
211 | return 0; | |
212 | ||
5195d8e2 | 213 | list_for_each_entry(n, &ctx->names_list, list) { |
84cb777e | 214 | if ((n->ino != AUDIT_INO_UNSET) && |
5195d8e2 | 215 | ((n->mode & S_IFMT) == mode)) |
5ef30ee5 EP |
216 | return 1; |
217 | } | |
5195d8e2 | 218 | |
5ef30ee5 | 219 | return 0; |
8b67dca9 AV |
220 | } |
221 | ||
74c3cbe3 AV |
222 | /* |
223 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
224 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
225 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
226 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
227 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
228 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
229 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
230 | */ | |
231 | ||
679173b7 EP |
232 | static void audit_set_auditable(struct audit_context *ctx) |
233 | { | |
234 | if (!ctx->prio) { | |
235 | ctx->prio = 1; | |
236 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
237 | } | |
238 | } | |
239 | ||
74c3cbe3 AV |
240 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
241 | { | |
242 | struct audit_tree_refs *p = ctx->trees; | |
243 | int left = ctx->tree_count; | |
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; | |
264 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
265 | if (!ctx->trees) { | |
266 | ctx->trees = p; | |
267 | return 0; | |
268 | } | |
269 | if (p) | |
270 | p->next = ctx->trees; | |
271 | else | |
272 | ctx->first_trees = ctx->trees; | |
273 | ctx->tree_count = 31; | |
274 | return 1; | |
275 | } | |
74c3cbe3 AV |
276 | |
277 | static void unroll_tree_refs(struct audit_context *ctx, | |
278 | struct audit_tree_refs *p, int count) | |
279 | { | |
74c3cbe3 AV |
280 | struct audit_tree_refs *q; |
281 | int n; | |
282 | if (!p) { | |
283 | /* we started with empty chain */ | |
284 | p = ctx->first_trees; | |
285 | count = 31; | |
286 | /* if the very first allocation has failed, nothing to do */ | |
287 | if (!p) | |
288 | return; | |
289 | } | |
290 | n = count; | |
291 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
292 | while (n--) { | |
293 | audit_put_chunk(q->c[n]); | |
294 | q->c[n] = NULL; | |
295 | } | |
296 | } | |
297 | while (n-- > ctx->tree_count) { | |
298 | audit_put_chunk(q->c[n]); | |
299 | q->c[n] = NULL; | |
300 | } | |
301 | ctx->trees = p; | |
302 | ctx->tree_count = count; | |
74c3cbe3 AV |
303 | } |
304 | ||
305 | static void free_tree_refs(struct audit_context *ctx) | |
306 | { | |
307 | struct audit_tree_refs *p, *q; | |
308 | for (p = ctx->first_trees; p; p = q) { | |
309 | q = p->next; | |
310 | kfree(p); | |
311 | } | |
312 | } | |
313 | ||
314 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
315 | { | |
74c3cbe3 AV |
316 | struct audit_tree_refs *p; |
317 | int n; | |
318 | if (!tree) | |
319 | return 0; | |
320 | /* full ones */ | |
321 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
322 | for (n = 0; n < 31; n++) | |
323 | if (audit_tree_match(p->c[n], tree)) | |
324 | return 1; | |
325 | } | |
326 | /* partial */ | |
327 | if (p) { | |
328 | for (n = ctx->tree_count; n < 31; n++) | |
329 | if (audit_tree_match(p->c[n], tree)) | |
330 | return 1; | |
331 | } | |
74c3cbe3 AV |
332 | return 0; |
333 | } | |
334 | ||
ca57ec0f EB |
335 | static int audit_compare_uid(kuid_t uid, |
336 | struct audit_names *name, | |
337 | struct audit_field *f, | |
338 | struct audit_context *ctx) | |
b34b0393 EP |
339 | { |
340 | struct audit_names *n; | |
b34b0393 | 341 | int rc; |
ca57ec0f | 342 | |
b34b0393 | 343 | if (name) { |
ca57ec0f | 344 | rc = audit_uid_comparator(uid, f->op, name->uid); |
b34b0393 EP |
345 | if (rc) |
346 | return rc; | |
347 | } | |
ca57ec0f | 348 | |
b34b0393 EP |
349 | if (ctx) { |
350 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f EB |
351 | rc = audit_uid_comparator(uid, f->op, n->uid); |
352 | if (rc) | |
353 | return rc; | |
354 | } | |
355 | } | |
356 | return 0; | |
357 | } | |
b34b0393 | 358 | |
ca57ec0f EB |
359 | static int audit_compare_gid(kgid_t gid, |
360 | struct audit_names *name, | |
361 | struct audit_field *f, | |
362 | struct audit_context *ctx) | |
363 | { | |
364 | struct audit_names *n; | |
365 | int rc; | |
366 | ||
367 | if (name) { | |
368 | rc = audit_gid_comparator(gid, f->op, name->gid); | |
369 | if (rc) | |
370 | return rc; | |
371 | } | |
372 | ||
373 | if (ctx) { | |
374 | list_for_each_entry(n, &ctx->names_list, list) { | |
375 | rc = audit_gid_comparator(gid, f->op, n->gid); | |
b34b0393 EP |
376 | if (rc) |
377 | return rc; | |
378 | } | |
379 | } | |
380 | return 0; | |
381 | } | |
382 | ||
02d86a56 EP |
383 | static int audit_field_compare(struct task_struct *tsk, |
384 | const struct cred *cred, | |
385 | struct audit_field *f, | |
386 | struct audit_context *ctx, | |
387 | struct audit_names *name) | |
388 | { | |
02d86a56 | 389 | switch (f->val) { |
4a6633ed | 390 | /* process to file object comparisons */ |
02d86a56 | 391 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
ca57ec0f | 392 | return audit_compare_uid(cred->uid, name, f, ctx); |
c9fe685f | 393 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
ca57ec0f | 394 | return audit_compare_gid(cred->gid, name, f, ctx); |
4a6633ed | 395 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
ca57ec0f | 396 | return audit_compare_uid(cred->euid, name, f, ctx); |
4a6633ed | 397 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
ca57ec0f | 398 | return audit_compare_gid(cred->egid, name, f, ctx); |
4a6633ed | 399 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
38f80590 | 400 | return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx); |
4a6633ed | 401 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
ca57ec0f | 402 | return audit_compare_uid(cred->suid, name, f, ctx); |
4a6633ed | 403 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
ca57ec0f | 404 | return audit_compare_gid(cred->sgid, name, f, ctx); |
4a6633ed | 405 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
ca57ec0f | 406 | return audit_compare_uid(cred->fsuid, name, f, ctx); |
4a6633ed | 407 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
ca57ec0f | 408 | return audit_compare_gid(cred->fsgid, name, f, ctx); |
10d68360 PM |
409 | /* uid comparisons */ |
410 | case AUDIT_COMPARE_UID_TO_AUID: | |
38f80590 RGB |
411 | return audit_uid_comparator(cred->uid, f->op, |
412 | audit_get_loginuid(tsk)); | |
10d68360 | 413 | case AUDIT_COMPARE_UID_TO_EUID: |
ca57ec0f | 414 | return audit_uid_comparator(cred->uid, f->op, cred->euid); |
10d68360 | 415 | case AUDIT_COMPARE_UID_TO_SUID: |
ca57ec0f | 416 | return audit_uid_comparator(cred->uid, f->op, cred->suid); |
10d68360 | 417 | case AUDIT_COMPARE_UID_TO_FSUID: |
ca57ec0f | 418 | return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
10d68360 PM |
419 | /* auid comparisons */ |
420 | case AUDIT_COMPARE_AUID_TO_EUID: | |
38f80590 RGB |
421 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
422 | cred->euid); | |
10d68360 | 423 | case AUDIT_COMPARE_AUID_TO_SUID: |
38f80590 RGB |
424 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
425 | cred->suid); | |
10d68360 | 426 | case AUDIT_COMPARE_AUID_TO_FSUID: |
38f80590 RGB |
427 | return audit_uid_comparator(audit_get_loginuid(tsk), f->op, |
428 | cred->fsuid); | |
10d68360 PM |
429 | /* euid comparisons */ |
430 | case AUDIT_COMPARE_EUID_TO_SUID: | |
ca57ec0f | 431 | return audit_uid_comparator(cred->euid, f->op, cred->suid); |
10d68360 | 432 | case AUDIT_COMPARE_EUID_TO_FSUID: |
ca57ec0f | 433 | return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
10d68360 PM |
434 | /* suid comparisons */ |
435 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
ca57ec0f | 436 | return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
10d68360 PM |
437 | /* gid comparisons */ |
438 | case AUDIT_COMPARE_GID_TO_EGID: | |
ca57ec0f | 439 | return audit_gid_comparator(cred->gid, f->op, cred->egid); |
10d68360 | 440 | case AUDIT_COMPARE_GID_TO_SGID: |
ca57ec0f | 441 | return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
10d68360 | 442 | case AUDIT_COMPARE_GID_TO_FSGID: |
ca57ec0f | 443 | return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
10d68360 PM |
444 | /* egid comparisons */ |
445 | case AUDIT_COMPARE_EGID_TO_SGID: | |
ca57ec0f | 446 | return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
10d68360 | 447 | case AUDIT_COMPARE_EGID_TO_FSGID: |
ca57ec0f | 448 | return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
10d68360 PM |
449 | /* sgid comparison */ |
450 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
ca57ec0f | 451 | return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
02d86a56 EP |
452 | default: |
453 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
454 | return 0; | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
f368c07d | 459 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 460 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
461 | * otherwise. |
462 | * | |
463 | * If task_creation is true, this is an explicit indication that we are | |
464 | * filtering a task rule at task creation time. This and tsk == current are | |
465 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
466 | */ | |
1da177e4 | 467 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 468 | struct audit_krule *rule, |
1da177e4 | 469 | struct audit_context *ctx, |
f368c07d | 470 | struct audit_names *name, |
f5629883 TJ |
471 | enum audit_state *state, |
472 | bool task_creation) | |
1da177e4 | 473 | { |
f5629883 | 474 | const struct cred *cred; |
5195d8e2 | 475 | int i, need_sid = 1; |
3dc7e315 | 476 | u32 sid; |
8fae4770 | 477 | unsigned int sessionid; |
3dc7e315 | 478 | |
f5629883 TJ |
479 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
480 | ||
1da177e4 | 481 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 482 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 483 | struct audit_names *n; |
1da177e4 | 484 | int result = 0; |
f1dc4867 | 485 | pid_t pid; |
1da177e4 | 486 | |
93315ed6 | 487 | switch (f->type) { |
1da177e4 | 488 | case AUDIT_PID: |
fa2bea2f | 489 | pid = task_tgid_nr(tsk); |
f1dc4867 | 490 | result = audit_comparator(pid, f->op, f->val); |
1da177e4 | 491 | break; |
3c66251e | 492 | case AUDIT_PPID: |
419c58f1 AV |
493 | if (ctx) { |
494 | if (!ctx->ppid) | |
c92cdeb4 | 495 | ctx->ppid = task_ppid_nr(tsk); |
3c66251e | 496 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 497 | } |
3c66251e | 498 | break; |
34d99af5 RGB |
499 | case AUDIT_EXE: |
500 | result = audit_exe_compare(tsk, rule->exe); | |
23bcc480 OM |
501 | if (f->op == Audit_not_equal) |
502 | result = !result; | |
34d99af5 | 503 | break; |
1da177e4 | 504 | case AUDIT_UID: |
ca57ec0f | 505 | result = audit_uid_comparator(cred->uid, f->op, f->uid); |
1da177e4 LT |
506 | break; |
507 | case AUDIT_EUID: | |
ca57ec0f | 508 | result = audit_uid_comparator(cred->euid, f->op, f->uid); |
1da177e4 LT |
509 | break; |
510 | case AUDIT_SUID: | |
ca57ec0f | 511 | result = audit_uid_comparator(cred->suid, f->op, f->uid); |
1da177e4 LT |
512 | break; |
513 | case AUDIT_FSUID: | |
ca57ec0f | 514 | result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
1da177e4 LT |
515 | break; |
516 | case AUDIT_GID: | |
ca57ec0f | 517 | result = audit_gid_comparator(cred->gid, f->op, f->gid); |
37eebe39 MI |
518 | if (f->op == Audit_equal) { |
519 | if (!result) | |
af85d177 | 520 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
521 | } else if (f->op == Audit_not_equal) { |
522 | if (result) | |
af85d177 | 523 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 524 | } |
1da177e4 LT |
525 | break; |
526 | case AUDIT_EGID: | |
ca57ec0f | 527 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39 MI |
528 | if (f->op == Audit_equal) { |
529 | if (!result) | |
af85d177 | 530 | result = groups_search(cred->group_info, f->gid); |
37eebe39 MI |
531 | } else if (f->op == Audit_not_equal) { |
532 | if (result) | |
af85d177 | 533 | result = !groups_search(cred->group_info, f->gid); |
37eebe39 | 534 | } |
1da177e4 LT |
535 | break; |
536 | case AUDIT_SGID: | |
ca57ec0f | 537 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
538 | break; |
539 | case AUDIT_FSGID: | |
ca57ec0f | 540 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 | 541 | break; |
8fae4770 | 542 | case AUDIT_SESSIONID: |
5b713886 | 543 | sessionid = audit_get_sessionid(tsk); |
8fae4770 RGB |
544 | result = audit_comparator(sessionid, f->op, f->val); |
545 | break; | |
1da177e4 | 546 | case AUDIT_PERS: |
93315ed6 | 547 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 548 | break; |
2fd6f58b | 549 | case AUDIT_ARCH: |
9f8dbe9c | 550 | if (ctx) |
93315ed6 | 551 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 552 | break; |
1da177e4 LT |
553 | |
554 | case AUDIT_EXIT: | |
555 | if (ctx && ctx->return_valid) | |
93315ed6 | 556 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
557 | break; |
558 | case AUDIT_SUCCESS: | |
b01f2cc1 | 559 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
560 | if (f->val) |
561 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 562 | else |
93315ed6 | 563 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 564 | } |
1da177e4 LT |
565 | break; |
566 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
567 | if (name) { |
568 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
569 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
570 | ++result; | |
571 | } else if (ctx) { | |
5195d8e2 | 572 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
573 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
574 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
575 | ++result; |
576 | break; | |
577 | } | |
578 | } | |
579 | } | |
580 | break; | |
581 | case AUDIT_DEVMINOR: | |
16c174bd EP |
582 | if (name) { |
583 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
584 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
585 | ++result; | |
586 | } else if (ctx) { | |
5195d8e2 | 587 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
588 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
589 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
590 | ++result; |
591 | break; | |
592 | } | |
593 | } | |
594 | } | |
595 | break; | |
596 | case AUDIT_INODE: | |
f368c07d | 597 | if (name) |
db510fc5 | 598 | result = audit_comparator(name->ino, f->op, f->val); |
f368c07d | 599 | else if (ctx) { |
5195d8e2 EP |
600 | list_for_each_entry(n, &ctx->names_list, list) { |
601 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
602 | ++result; |
603 | break; | |
604 | } | |
605 | } | |
606 | } | |
607 | break; | |
efaffd6e EP |
608 | case AUDIT_OBJ_UID: |
609 | if (name) { | |
ca57ec0f | 610 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
611 | } else if (ctx) { |
612 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 613 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
614 | ++result; |
615 | break; | |
616 | } | |
617 | } | |
618 | } | |
619 | break; | |
54d3218b EP |
620 | case AUDIT_OBJ_GID: |
621 | if (name) { | |
ca57ec0f | 622 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
623 | } else if (ctx) { |
624 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 625 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
626 | ++result; |
627 | break; | |
628 | } | |
629 | } | |
630 | } | |
631 | break; | |
f368c07d | 632 | case AUDIT_WATCH: |
0223fad3 RGB |
633 | if (name) { |
634 | result = audit_watch_compare(rule->watch, | |
635 | name->ino, | |
636 | name->dev); | |
637 | if (f->op == Audit_not_equal) | |
638 | result = !result; | |
639 | } | |
f368c07d | 640 | break; |
74c3cbe3 | 641 | case AUDIT_DIR: |
0223fad3 | 642 | if (ctx) { |
74c3cbe3 | 643 | result = match_tree_refs(ctx, rule->tree); |
0223fad3 RGB |
644 | if (f->op == Audit_not_equal) |
645 | result = !result; | |
646 | } | |
74c3cbe3 | 647 | break; |
1da177e4 | 648 | case AUDIT_LOGINUID: |
38f80590 RGB |
649 | result = audit_uid_comparator(audit_get_loginuid(tsk), |
650 | f->op, f->uid); | |
1da177e4 | 651 | break; |
780a7654 EB |
652 | case AUDIT_LOGINUID_SET: |
653 | result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); | |
654 | break; | |
bf361231 RGB |
655 | case AUDIT_SADDR_FAM: |
656 | if (ctx->sockaddr) | |
657 | result = audit_comparator(ctx->sockaddr->ss_family, | |
658 | f->op, f->val); | |
659 | break; | |
3a6b9f85 DG |
660 | case AUDIT_SUBJ_USER: |
661 | case AUDIT_SUBJ_ROLE: | |
662 | case AUDIT_SUBJ_TYPE: | |
663 | case AUDIT_SUBJ_SEN: | |
664 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
665 | /* NOTE: this may return negative values indicating |
666 | a temporary error. We simply treat this as a | |
667 | match for now to avoid losing information that | |
668 | may be wanted. An error message will also be | |
669 | logged upon error */ | |
04305e4a | 670 | if (f->lsm_rule) { |
2ad312d2 | 671 | if (need_sid) { |
2a862b32 | 672 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
673 | need_sid = 0; |
674 | } | |
d7a96f3a | 675 | result = security_audit_rule_match(sid, f->type, |
90462a5b RGB |
676 | f->op, |
677 | f->lsm_rule); | |
2ad312d2 | 678 | } |
3dc7e315 | 679 | break; |
6e5a2d1d DG |
680 | case AUDIT_OBJ_USER: |
681 | case AUDIT_OBJ_ROLE: | |
682 | case AUDIT_OBJ_TYPE: | |
683 | case AUDIT_OBJ_LEV_LOW: | |
684 | case AUDIT_OBJ_LEV_HIGH: | |
685 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
686 | also applies here */ | |
04305e4a | 687 | if (f->lsm_rule) { |
6e5a2d1d DG |
688 | /* Find files that match */ |
689 | if (name) { | |
d7a96f3a | 690 | result = security_audit_rule_match( |
90462a5b RGB |
691 | name->osid, |
692 | f->type, | |
693 | f->op, | |
694 | f->lsm_rule); | |
6e5a2d1d | 695 | } else if (ctx) { |
5195d8e2 | 696 | list_for_each_entry(n, &ctx->names_list, list) { |
90462a5b RGB |
697 | if (security_audit_rule_match( |
698 | n->osid, | |
699 | f->type, | |
700 | f->op, | |
701 | f->lsm_rule)) { | |
6e5a2d1d DG |
702 | ++result; |
703 | break; | |
704 | } | |
705 | } | |
706 | } | |
707 | /* Find ipc objects that match */ | |
a33e6751 AV |
708 | if (!ctx || ctx->type != AUDIT_IPC) |
709 | break; | |
710 | if (security_audit_rule_match(ctx->ipc.osid, | |
711 | f->type, f->op, | |
90462a5b | 712 | f->lsm_rule)) |
a33e6751 | 713 | ++result; |
6e5a2d1d DG |
714 | } |
715 | break; | |
1da177e4 LT |
716 | case AUDIT_ARG0: |
717 | case AUDIT_ARG1: | |
718 | case AUDIT_ARG2: | |
719 | case AUDIT_ARG3: | |
720 | if (ctx) | |
93315ed6 | 721 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 722 | break; |
5adc8a6a AG |
723 | case AUDIT_FILTERKEY: |
724 | /* ignore this field for filtering */ | |
725 | result = 1; | |
726 | break; | |
55669bfa AV |
727 | case AUDIT_PERM: |
728 | result = audit_match_perm(ctx, f->val); | |
0223fad3 RGB |
729 | if (f->op == Audit_not_equal) |
730 | result = !result; | |
55669bfa | 731 | break; |
8b67dca9 AV |
732 | case AUDIT_FILETYPE: |
733 | result = audit_match_filetype(ctx, f->val); | |
0223fad3 RGB |
734 | if (f->op == Audit_not_equal) |
735 | result = !result; | |
8b67dca9 | 736 | break; |
02d86a56 EP |
737 | case AUDIT_FIELD_COMPARE: |
738 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
739 | break; | |
1da177e4 | 740 | } |
f5629883 | 741 | if (!result) |
1da177e4 LT |
742 | return 0; |
743 | } | |
0590b933 AV |
744 | |
745 | if (ctx) { | |
746 | if (rule->prio <= ctx->prio) | |
747 | return 0; | |
748 | if (rule->filterkey) { | |
749 | kfree(ctx->filterkey); | |
750 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
751 | } | |
752 | ctx->prio = rule->prio; | |
753 | } | |
1da177e4 | 754 | switch (rule->action) { |
66b12abc PM |
755 | case AUDIT_NEVER: |
756 | *state = AUDIT_DISABLED; | |
757 | break; | |
758 | case AUDIT_ALWAYS: | |
759 | *state = AUDIT_RECORD_CONTEXT; | |
760 | break; | |
1da177e4 LT |
761 | } |
762 | return 1; | |
763 | } | |
764 | ||
765 | /* At process creation time, we can determine if system-call auditing is | |
766 | * completely disabled for this task. Since we only have the task | |
767 | * structure at this point, we can only check uid and gid. | |
768 | */ | |
e048e02c | 769 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
770 | { |
771 | struct audit_entry *e; | |
772 | enum audit_state state; | |
773 | ||
774 | rcu_read_lock(); | |
0f45aa18 | 775 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
776 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
777 | &state, true)) { | |
e048e02c AV |
778 | if (state == AUDIT_RECORD_CONTEXT) |
779 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
780 | rcu_read_unlock(); |
781 | return state; | |
782 | } | |
783 | } | |
784 | rcu_read_unlock(); | |
785 | return AUDIT_BUILD_CONTEXT; | |
786 | } | |
787 | ||
a3c54931 AL |
788 | static int audit_in_mask(const struct audit_krule *rule, unsigned long val) |
789 | { | |
790 | int word, bit; | |
791 | ||
792 | if (val > 0xffffffff) | |
793 | return false; | |
794 | ||
795 | word = AUDIT_WORD(val); | |
796 | if (word >= AUDIT_BITMASK_SIZE) | |
797 | return false; | |
798 | ||
799 | bit = AUDIT_BIT(val); | |
800 | ||
801 | return rule->mask[word] & bit; | |
802 | } | |
803 | ||
1da177e4 LT |
804 | /* At syscall entry and exit time, this filter is called if the |
805 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 806 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 807 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
808 | */ |
809 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
810 | struct audit_context *ctx, | |
811 | struct list_head *list) | |
812 | { | |
813 | struct audit_entry *e; | |
c3896495 | 814 | enum audit_state state; |
1da177e4 | 815 | |
5b52330b | 816 | if (auditd_test_task(tsk)) |
f7056d64 DW |
817 | return AUDIT_DISABLED; |
818 | ||
1da177e4 | 819 | rcu_read_lock(); |
699c1868 RGB |
820 | list_for_each_entry_rcu(e, list, list) { |
821 | if (audit_in_mask(&e->rule, ctx->major) && | |
822 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
823 | &state, false)) { | |
824 | rcu_read_unlock(); | |
825 | ctx->current_state = state; | |
826 | return state; | |
f368c07d AG |
827 | } |
828 | } | |
829 | rcu_read_unlock(); | |
830 | return AUDIT_BUILD_CONTEXT; | |
831 | } | |
832 | ||
5195d8e2 EP |
833 | /* |
834 | * Given an audit_name check the inode hash table to see if they match. | |
835 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
836 | */ | |
837 | static int audit_filter_inode_name(struct task_struct *tsk, | |
838 | struct audit_names *n, | |
839 | struct audit_context *ctx) { | |
5195d8e2 EP |
840 | int h = audit_hash_ino((u32)n->ino); |
841 | struct list_head *list = &audit_inode_hash[h]; | |
842 | struct audit_entry *e; | |
843 | enum audit_state state; | |
844 | ||
5195d8e2 | 845 | list_for_each_entry_rcu(e, list, list) { |
a3c54931 | 846 | if (audit_in_mask(&e->rule, ctx->major) && |
5195d8e2 EP |
847 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { |
848 | ctx->current_state = state; | |
849 | return 1; | |
850 | } | |
851 | } | |
5195d8e2 EP |
852 | return 0; |
853 | } | |
854 | ||
855 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 856 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 857 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
858 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
859 | */ | |
0590b933 | 860 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 861 | { |
5195d8e2 | 862 | struct audit_names *n; |
f368c07d | 863 | |
5b52330b | 864 | if (auditd_test_task(tsk)) |
0590b933 | 865 | return; |
f368c07d AG |
866 | |
867 | rcu_read_lock(); | |
f368c07d | 868 | |
5195d8e2 EP |
869 | list_for_each_entry(n, &ctx->names_list, list) { |
870 | if (audit_filter_inode_name(tsk, n, ctx)) | |
871 | break; | |
0f45aa18 DW |
872 | } |
873 | rcu_read_unlock(); | |
0f45aa18 DW |
874 | } |
875 | ||
3f1c8250 WR |
876 | static inline void audit_proctitle_free(struct audit_context *context) |
877 | { | |
878 | kfree(context->proctitle.value); | |
879 | context->proctitle.value = NULL; | |
880 | context->proctitle.len = 0; | |
881 | } | |
882 | ||
95e0b46f LR |
883 | static inline void audit_free_module(struct audit_context *context) |
884 | { | |
885 | if (context->type == AUDIT_KERN_MODULE) { | |
886 | kfree(context->module.name); | |
887 | context->module.name = NULL; | |
888 | } | |
889 | } | |
1da177e4 LT |
890 | static inline void audit_free_names(struct audit_context *context) |
891 | { | |
5195d8e2 | 892 | struct audit_names *n, *next; |
1da177e4 | 893 | |
5195d8e2 EP |
894 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
895 | list_del(&n->list); | |
55422d0b PM |
896 | if (n->name) |
897 | putname(n->name); | |
5195d8e2 EP |
898 | if (n->should_free) |
899 | kfree(n); | |
8c8570fb | 900 | } |
1da177e4 | 901 | context->name_count = 0; |
44707fdf JB |
902 | path_put(&context->pwd); |
903 | context->pwd.dentry = NULL; | |
904 | context->pwd.mnt = NULL; | |
1da177e4 LT |
905 | } |
906 | ||
907 | static inline void audit_free_aux(struct audit_context *context) | |
908 | { | |
909 | struct audit_aux_data *aux; | |
910 | ||
911 | while ((aux = context->aux)) { | |
912 | context->aux = aux->next; | |
913 | kfree(aux); | |
914 | } | |
e54dc243 AG |
915 | while ((aux = context->aux_pids)) { |
916 | context->aux_pids = aux->next; | |
917 | kfree(aux); | |
918 | } | |
1da177e4 LT |
919 | } |
920 | ||
1da177e4 LT |
921 | static inline struct audit_context *audit_alloc_context(enum audit_state state) |
922 | { | |
923 | struct audit_context *context; | |
924 | ||
17c6ee70 RM |
925 | context = kzalloc(sizeof(*context), GFP_KERNEL); |
926 | if (!context) | |
1da177e4 | 927 | return NULL; |
e2c5adc8 AM |
928 | context->state = state; |
929 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; | |
916d7576 | 930 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 931 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
932 | return context; |
933 | } | |
934 | ||
b0dd25a8 RD |
935 | /** |
936 | * audit_alloc - allocate an audit context block for a task | |
937 | * @tsk: task | |
938 | * | |
939 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
940 | * if necessary. Doing so turns on system call auditing for the |
941 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
942 | * needed. |
943 | */ | |
1da177e4 LT |
944 | int audit_alloc(struct task_struct *tsk) |
945 | { | |
946 | struct audit_context *context; | |
947 | enum audit_state state; | |
e048e02c | 948 | char *key = NULL; |
1da177e4 | 949 | |
b593d384 | 950 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
951 | return 0; /* Return if not auditing. */ |
952 | ||
e048e02c | 953 | state = audit_filter_task(tsk, &key); |
d48d8051 ON |
954 | if (state == AUDIT_DISABLED) { |
955 | clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1da177e4 | 956 | return 0; |
d48d8051 | 957 | } |
1da177e4 LT |
958 | |
959 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 960 | kfree(key); |
1da177e4 LT |
961 | audit_log_lost("out of memory in audit_alloc"); |
962 | return -ENOMEM; | |
963 | } | |
e048e02c | 964 | context->filterkey = key; |
1da177e4 | 965 | |
c0b0ae8a | 966 | audit_set_context(tsk, context); |
1da177e4 LT |
967 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); |
968 | return 0; | |
969 | } | |
970 | ||
971 | static inline void audit_free_context(struct audit_context *context) | |
972 | { | |
95e0b46f | 973 | audit_free_module(context); |
c62d773a AV |
974 | audit_free_names(context); |
975 | unroll_tree_refs(context, NULL, 0); | |
976 | free_tree_refs(context); | |
977 | audit_free_aux(context); | |
978 | kfree(context->filterkey); | |
979 | kfree(context->sockaddr); | |
3f1c8250 | 980 | audit_proctitle_free(context); |
c62d773a | 981 | kfree(context); |
1da177e4 LT |
982 | } |
983 | ||
e54dc243 | 984 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9 | 985 | kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b | 986 | u32 sid, char *comm) |
e54dc243 AG |
987 | { |
988 | struct audit_buffer *ab; | |
2a862b32 | 989 | char *ctx = NULL; |
e54dc243 AG |
990 | u32 len; |
991 | int rc = 0; | |
992 | ||
993 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
994 | if (!ab) | |
6246ccab | 995 | return rc; |
e54dc243 | 996 | |
e1760bd5 EB |
997 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
998 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 999 | from_kuid(&init_user_ns, uid), sessionid); |
ad395abe EP |
1000 | if (sid) { |
1001 | if (security_secid_to_secctx(sid, &ctx, &len)) { | |
1002 | audit_log_format(ab, " obj=(none)"); | |
1003 | rc = 1; | |
1004 | } else { | |
1005 | audit_log_format(ab, " obj=%s", ctx); | |
1006 | security_release_secctx(ctx, len); | |
1007 | } | |
2a862b32 | 1008 | } |
c2a7780e EP |
1009 | audit_log_format(ab, " ocomm="); |
1010 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1011 | audit_log_end(ab); |
e54dc243 AG |
1012 | |
1013 | return rc; | |
1014 | } | |
1015 | ||
43761473 PM |
1016 | static void audit_log_execve_info(struct audit_context *context, |
1017 | struct audit_buffer **ab) | |
bdf4c48a | 1018 | { |
43761473 PM |
1019 | long len_max; |
1020 | long len_rem; | |
1021 | long len_full; | |
1022 | long len_buf; | |
8443075e | 1023 | long len_abuf = 0; |
43761473 PM |
1024 | long len_tmp; |
1025 | bool require_data; | |
1026 | bool encode; | |
1027 | unsigned int iter; | |
1028 | unsigned int arg; | |
1029 | char *buf_head; | |
1030 | char *buf; | |
1031 | const char __user *p = (const char __user *)current->mm->arg_start; | |
1032 | ||
1033 | /* NOTE: this buffer needs to be large enough to hold all the non-arg | |
1034 | * data we put in the audit record for this argument (see the | |
1035 | * code below) ... at this point in time 96 is plenty */ | |
1036 | char abuf[96]; | |
1037 | ||
1038 | /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the | |
1039 | * current value of 7500 is not as important as the fact that it | |
1040 | * is less than 8k, a setting of 7500 gives us plenty of wiggle | |
1041 | * room if we go over a little bit in the logging below */ | |
1042 | WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500); | |
1043 | len_max = MAX_EXECVE_AUDIT_LEN; | |
1044 | ||
1045 | /* scratch buffer to hold the userspace args */ | |
1046 | buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1047 | if (!buf_head) { | |
1048 | audit_panic("out of memory for argv string"); | |
1049 | return; | |
de6bbd1d | 1050 | } |
43761473 | 1051 | buf = buf_head; |
040b3a2d | 1052 | |
43761473 | 1053 | audit_log_format(*ab, "argc=%d", context->execve.argc); |
040b3a2d | 1054 | |
43761473 PM |
1055 | len_rem = len_max; |
1056 | len_buf = 0; | |
1057 | len_full = 0; | |
1058 | require_data = true; | |
1059 | encode = false; | |
1060 | iter = 0; | |
1061 | arg = 0; | |
de6bbd1d | 1062 | do { |
43761473 PM |
1063 | /* NOTE: we don't ever want to trust this value for anything |
1064 | * serious, but the audit record format insists we | |
1065 | * provide an argument length for really long arguments, | |
1066 | * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but | |
1067 | * to use strncpy_from_user() to obtain this value for | |
1068 | * recording in the log, although we don't use it | |
1069 | * anywhere here to avoid a double-fetch problem */ | |
1070 | if (len_full == 0) | |
1071 | len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
1072 | ||
1073 | /* read more data from userspace */ | |
1074 | if (require_data) { | |
1075 | /* can we make more room in the buffer? */ | |
1076 | if (buf != buf_head) { | |
1077 | memmove(buf_head, buf, len_buf); | |
1078 | buf = buf_head; | |
1079 | } | |
1080 | ||
1081 | /* fetch as much as we can of the argument */ | |
1082 | len_tmp = strncpy_from_user(&buf_head[len_buf], p, | |
1083 | len_max - len_buf); | |
1084 | if (len_tmp == -EFAULT) { | |
1085 | /* unable to copy from userspace */ | |
1086 | send_sig(SIGKILL, current, 0); | |
1087 | goto out; | |
1088 | } else if (len_tmp == (len_max - len_buf)) { | |
1089 | /* buffer is not large enough */ | |
1090 | require_data = true; | |
1091 | /* NOTE: if we are going to span multiple | |
1092 | * buffers force the encoding so we stand | |
1093 | * a chance at a sane len_full value and | |
1094 | * consistent record encoding */ | |
1095 | encode = true; | |
1096 | len_full = len_full * 2; | |
1097 | p += len_tmp; | |
1098 | } else { | |
1099 | require_data = false; | |
1100 | if (!encode) | |
1101 | encode = audit_string_contains_control( | |
1102 | buf, len_tmp); | |
1103 | /* try to use a trusted value for len_full */ | |
1104 | if (len_full < len_max) | |
1105 | len_full = (encode ? | |
1106 | len_tmp * 2 : len_tmp); | |
1107 | p += len_tmp + 1; | |
1108 | } | |
1109 | len_buf += len_tmp; | |
1110 | buf_head[len_buf] = '\0'; | |
bdf4c48a | 1111 | |
43761473 PM |
1112 | /* length of the buffer in the audit record? */ |
1113 | len_abuf = (encode ? len_buf * 2 : len_buf + 2); | |
bdf4c48a | 1114 | } |
de6bbd1d | 1115 | |
43761473 | 1116 | /* write as much as we can to the audit log */ |
ea956d8b | 1117 | if (len_buf >= 0) { |
43761473 PM |
1118 | /* NOTE: some magic numbers here - basically if we |
1119 | * can't fit a reasonable amount of data into the | |
1120 | * existing audit buffer, flush it and start with | |
1121 | * a new buffer */ | |
1122 | if ((sizeof(abuf) + 8) > len_rem) { | |
1123 | len_rem = len_max; | |
1124 | audit_log_end(*ab); | |
1125 | *ab = audit_log_start(context, | |
1126 | GFP_KERNEL, AUDIT_EXECVE); | |
1127 | if (!*ab) | |
1128 | goto out; | |
1129 | } | |
bdf4c48a | 1130 | |
43761473 PM |
1131 | /* create the non-arg portion of the arg record */ |
1132 | len_tmp = 0; | |
1133 | if (require_data || (iter > 0) || | |
1134 | ((len_abuf + sizeof(abuf)) > len_rem)) { | |
1135 | if (iter == 0) { | |
1136 | len_tmp += snprintf(&abuf[len_tmp], | |
1137 | sizeof(abuf) - len_tmp, | |
1138 | " a%d_len=%lu", | |
1139 | arg, len_full); | |
1140 | } | |
1141 | len_tmp += snprintf(&abuf[len_tmp], | |
1142 | sizeof(abuf) - len_tmp, | |
1143 | " a%d[%d]=", arg, iter++); | |
1144 | } else | |
1145 | len_tmp += snprintf(&abuf[len_tmp], | |
1146 | sizeof(abuf) - len_tmp, | |
1147 | " a%d=", arg); | |
1148 | WARN_ON(len_tmp >= sizeof(abuf)); | |
1149 | abuf[sizeof(abuf) - 1] = '\0'; | |
1150 | ||
1151 | /* log the arg in the audit record */ | |
1152 | audit_log_format(*ab, "%s", abuf); | |
1153 | len_rem -= len_tmp; | |
1154 | len_tmp = len_buf; | |
1155 | if (encode) { | |
1156 | if (len_abuf > len_rem) | |
1157 | len_tmp = len_rem / 2; /* encoding */ | |
1158 | audit_log_n_hex(*ab, buf, len_tmp); | |
1159 | len_rem -= len_tmp * 2; | |
1160 | len_abuf -= len_tmp * 2; | |
1161 | } else { | |
1162 | if (len_abuf > len_rem) | |
1163 | len_tmp = len_rem - 2; /* quotes */ | |
1164 | audit_log_n_string(*ab, buf, len_tmp); | |
1165 | len_rem -= len_tmp + 2; | |
1166 | /* don't subtract the "2" because we still need | |
1167 | * to add quotes to the remaining string */ | |
1168 | len_abuf -= len_tmp; | |
1169 | } | |
1170 | len_buf -= len_tmp; | |
1171 | buf += len_tmp; | |
1172 | } | |
bdf4c48a | 1173 | |
43761473 PM |
1174 | /* ready to move to the next argument? */ |
1175 | if ((len_buf == 0) && !require_data) { | |
1176 | arg++; | |
1177 | iter = 0; | |
1178 | len_full = 0; | |
1179 | require_data = true; | |
1180 | encode = false; | |
1181 | } | |
1182 | } while (arg < context->execve.argc); | |
de6bbd1d | 1183 | |
43761473 | 1184 | /* NOTE: the caller handles the final audit_log_end() call */ |
de6bbd1d | 1185 | |
43761473 PM |
1186 | out: |
1187 | kfree(buf_head); | |
bdf4c48a PZ |
1188 | } |
1189 | ||
2efa48fe Y |
1190 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, |
1191 | kernel_cap_t *cap) | |
5f3d544f RGB |
1192 | { |
1193 | int i; | |
1194 | ||
1195 | if (cap_isclear(*cap)) { | |
1196 | audit_log_format(ab, " %s=0", prefix); | |
1197 | return; | |
1198 | } | |
1199 | audit_log_format(ab, " %s=", prefix); | |
1200 | CAP_FOR_EACH_U32(i) | |
1201 | audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]); | |
1202 | } | |
1203 | ||
1204 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1205 | { | |
1206 | if (name->fcap_ver == -1) { | |
1207 | audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?"); | |
1208 | return; | |
1209 | } | |
1210 | audit_log_cap(ab, "cap_fp", &name->fcap.permitted); | |
1211 | audit_log_cap(ab, "cap_fi", &name->fcap.inheritable); | |
1212 | audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d", | |
1213 | name->fcap.fE, name->fcap_ver, | |
1214 | from_kuid(&init_user_ns, name->fcap.rootid)); | |
1215 | } | |
1216 | ||
a33e6751 | 1217 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1218 | { |
1219 | struct audit_buffer *ab; | |
1220 | int i; | |
1221 | ||
1222 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1223 | if (!ab) | |
1224 | return; | |
1225 | ||
1226 | switch (context->type) { | |
1227 | case AUDIT_SOCKETCALL: { | |
1228 | int nargs = context->socketcall.nargs; | |
1229 | audit_log_format(ab, "nargs=%d", nargs); | |
1230 | for (i = 0; i < nargs; i++) | |
1231 | audit_log_format(ab, " a%d=%lx", i, | |
1232 | context->socketcall.args[i]); | |
1233 | break; } | |
a33e6751 AV |
1234 | case AUDIT_IPC: { |
1235 | u32 osid = context->ipc.osid; | |
1236 | ||
2570ebbd | 1237 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1238 | from_kuid(&init_user_ns, context->ipc.uid), |
1239 | from_kgid(&init_user_ns, context->ipc.gid), | |
1240 | context->ipc.mode); | |
a33e6751 AV |
1241 | if (osid) { |
1242 | char *ctx = NULL; | |
1243 | u32 len; | |
1244 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1245 | audit_log_format(ab, " osid=%u", osid); | |
1246 | *call_panic = 1; | |
1247 | } else { | |
1248 | audit_log_format(ab, " obj=%s", ctx); | |
1249 | security_release_secctx(ctx, len); | |
1250 | } | |
1251 | } | |
e816f370 AV |
1252 | if (context->ipc.has_perm) { |
1253 | audit_log_end(ab); | |
1254 | ab = audit_log_start(context, GFP_KERNEL, | |
1255 | AUDIT_IPC_SET_PERM); | |
0644ec0c KC |
1256 | if (unlikely(!ab)) |
1257 | return; | |
e816f370 | 1258 | audit_log_format(ab, |
2570ebbd | 1259 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1260 | context->ipc.qbytes, |
1261 | context->ipc.perm_uid, | |
1262 | context->ipc.perm_gid, | |
1263 | context->ipc.perm_mode); | |
e816f370 | 1264 | } |
a33e6751 | 1265 | break; } |
fe8e52b9 | 1266 | case AUDIT_MQ_OPEN: |
564f6993 | 1267 | audit_log_format(ab, |
df0a4283 | 1268 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1269 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1270 | context->mq_open.oflag, context->mq_open.mode, | |
1271 | context->mq_open.attr.mq_flags, | |
1272 | context->mq_open.attr.mq_maxmsg, | |
1273 | context->mq_open.attr.mq_msgsize, | |
1274 | context->mq_open.attr.mq_curmsgs); | |
fe8e52b9 PM |
1275 | break; |
1276 | case AUDIT_MQ_SENDRECV: | |
c32c8af4 AV |
1277 | audit_log_format(ab, |
1278 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
b9047726 | 1279 | "abs_timeout_sec=%lld abs_timeout_nsec=%ld", |
c32c8af4 AV |
1280 | context->mq_sendrecv.mqdes, |
1281 | context->mq_sendrecv.msg_len, | |
1282 | context->mq_sendrecv.msg_prio, | |
b9047726 | 1283 | (long long) context->mq_sendrecv.abs_timeout.tv_sec, |
c32c8af4 | 1284 | context->mq_sendrecv.abs_timeout.tv_nsec); |
fe8e52b9 PM |
1285 | break; |
1286 | case AUDIT_MQ_NOTIFY: | |
20114f71 AV |
1287 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", |
1288 | context->mq_notify.mqdes, | |
1289 | context->mq_notify.sigev_signo); | |
fe8e52b9 | 1290 | break; |
7392906e AV |
1291 | case AUDIT_MQ_GETSETATTR: { |
1292 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1293 | audit_log_format(ab, | |
1294 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1295 | "mq_curmsgs=%ld ", | |
1296 | context->mq_getsetattr.mqdes, | |
1297 | attr->mq_flags, attr->mq_maxmsg, | |
1298 | attr->mq_msgsize, attr->mq_curmsgs); | |
1299 | break; } | |
fe8e52b9 | 1300 | case AUDIT_CAPSET: |
57f71a0a AV |
1301 | audit_log_format(ab, "pid=%d", context->capset.pid); |
1302 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1303 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1304 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
7786f6b6 | 1305 | audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient); |
fe8e52b9 PM |
1306 | break; |
1307 | case AUDIT_MMAP: | |
120a795d AV |
1308 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, |
1309 | context->mmap.flags); | |
fe8e52b9 PM |
1310 | break; |
1311 | case AUDIT_EXECVE: | |
d9cfea91 | 1312 | audit_log_execve_info(context, &ab); |
fe8e52b9 | 1313 | break; |
ca86cad7 RGB |
1314 | case AUDIT_KERN_MODULE: |
1315 | audit_log_format(ab, "name="); | |
b305f7ed YW |
1316 | if (context->module.name) { |
1317 | audit_log_untrustedstring(ab, context->module.name); | |
b305f7ed YW |
1318 | } else |
1319 | audit_log_format(ab, "(null)"); | |
1320 | ||
ca86cad7 | 1321 | break; |
f3298dc4 AV |
1322 | } |
1323 | audit_log_end(ab); | |
1324 | } | |
1325 | ||
3f1c8250 WR |
1326 | static inline int audit_proctitle_rtrim(char *proctitle, int len) |
1327 | { | |
1328 | char *end = proctitle + len - 1; | |
1329 | while (end > proctitle && !isprint(*end)) | |
1330 | end--; | |
1331 | ||
1332 | /* catch the case where proctitle is only 1 non-print character */ | |
1333 | len = end - proctitle + 1; | |
1334 | len -= isprint(proctitle[len-1]) == 0; | |
1335 | return len; | |
1336 | } | |
1337 | ||
5f3d544f RGB |
1338 | /* |
1339 | * audit_log_name - produce AUDIT_PATH record from struct audit_names | |
1340 | * @context: audit_context for the task | |
1341 | * @n: audit_names structure with reportable details | |
1342 | * @path: optional path to report instead of audit_names->name | |
1343 | * @record_num: record number to report when handling a list of names | |
1344 | * @call_panic: optional pointer to int that will be updated if secid fails | |
1345 | */ | |
1346 | static void audit_log_name(struct audit_context *context, struct audit_names *n, | |
1347 | const struct path *path, int record_num, int *call_panic) | |
1348 | { | |
1349 | struct audit_buffer *ab; | |
1350 | ||
1351 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1352 | if (!ab) | |
1353 | return; | |
1354 | ||
1355 | audit_log_format(ab, "item=%d", record_num); | |
1356 | ||
1357 | if (path) | |
1358 | audit_log_d_path(ab, " name=", path); | |
1359 | else if (n->name) { | |
1360 | switch (n->name_len) { | |
1361 | case AUDIT_NAME_FULL: | |
1362 | /* log the full path */ | |
1363 | audit_log_format(ab, " name="); | |
1364 | audit_log_untrustedstring(ab, n->name->name); | |
1365 | break; | |
1366 | case 0: | |
1367 | /* name was specified as a relative path and the | |
1368 | * directory component is the cwd | |
1369 | */ | |
1370 | audit_log_d_path(ab, " name=", &context->pwd); | |
1371 | break; | |
1372 | default: | |
1373 | /* log the name's directory component */ | |
1374 | audit_log_format(ab, " name="); | |
1375 | audit_log_n_untrustedstring(ab, n->name->name, | |
1376 | n->name_len); | |
1377 | } | |
1378 | } else | |
1379 | audit_log_format(ab, " name=(null)"); | |
1380 | ||
1381 | if (n->ino != AUDIT_INO_UNSET) | |
1382 | audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x", | |
1383 | n->ino, | |
1384 | MAJOR(n->dev), | |
1385 | MINOR(n->dev), | |
1386 | n->mode, | |
1387 | from_kuid(&init_user_ns, n->uid), | |
1388 | from_kgid(&init_user_ns, n->gid), | |
1389 | MAJOR(n->rdev), | |
1390 | MINOR(n->rdev)); | |
1391 | if (n->osid != 0) { | |
1392 | char *ctx = NULL; | |
1393 | u32 len; | |
1394 | ||
1395 | if (security_secid_to_secctx( | |
1396 | n->osid, &ctx, &len)) { | |
1397 | audit_log_format(ab, " osid=%u", n->osid); | |
1398 | if (call_panic) | |
1399 | *call_panic = 2; | |
1400 | } else { | |
1401 | audit_log_format(ab, " obj=%s", ctx); | |
1402 | security_release_secctx(ctx, len); | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | /* log the audit_names record type */ | |
1407 | switch (n->type) { | |
1408 | case AUDIT_TYPE_NORMAL: | |
1409 | audit_log_format(ab, " nametype=NORMAL"); | |
1410 | break; | |
1411 | case AUDIT_TYPE_PARENT: | |
1412 | audit_log_format(ab, " nametype=PARENT"); | |
1413 | break; | |
1414 | case AUDIT_TYPE_CHILD_DELETE: | |
1415 | audit_log_format(ab, " nametype=DELETE"); | |
1416 | break; | |
1417 | case AUDIT_TYPE_CHILD_CREATE: | |
1418 | audit_log_format(ab, " nametype=CREATE"); | |
1419 | break; | |
1420 | default: | |
1421 | audit_log_format(ab, " nametype=UNKNOWN"); | |
1422 | break; | |
1423 | } | |
1424 | ||
1425 | audit_log_fcaps(ab, n); | |
1426 | audit_log_end(ab); | |
1427 | } | |
1428 | ||
2a1fe215 | 1429 | static void audit_log_proctitle(void) |
3f1c8250 WR |
1430 | { |
1431 | int res; | |
1432 | char *buf; | |
1433 | char *msg = "(null)"; | |
1434 | int len = strlen(msg); | |
2a1fe215 | 1435 | struct audit_context *context = audit_context(); |
3f1c8250 WR |
1436 | struct audit_buffer *ab; |
1437 | ||
1438 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE); | |
1439 | if (!ab) | |
1440 | return; /* audit_panic or being filtered */ | |
1441 | ||
1442 | audit_log_format(ab, "proctitle="); | |
1443 | ||
1444 | /* Not cached */ | |
1445 | if (!context->proctitle.value) { | |
1446 | buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL); | |
1447 | if (!buf) | |
1448 | goto out; | |
1449 | /* Historically called this from procfs naming */ | |
2a1fe215 | 1450 | res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN); |
3f1c8250 WR |
1451 | if (res == 0) { |
1452 | kfree(buf); | |
1453 | goto out; | |
1454 | } | |
1455 | res = audit_proctitle_rtrim(buf, res); | |
1456 | if (res == 0) { | |
1457 | kfree(buf); | |
1458 | goto out; | |
1459 | } | |
1460 | context->proctitle.value = buf; | |
1461 | context->proctitle.len = res; | |
1462 | } | |
1463 | msg = context->proctitle.value; | |
1464 | len = context->proctitle.len; | |
1465 | out: | |
1466 | audit_log_n_untrustedstring(ab, msg, len); | |
1467 | audit_log_end(ab); | |
1468 | } | |
1469 | ||
2a1fe215 | 1470 | static void audit_log_exit(void) |
1da177e4 | 1471 | { |
9c7aa6aa | 1472 | int i, call_panic = 0; |
2a1fe215 | 1473 | struct audit_context *context = audit_context(); |
1da177e4 | 1474 | struct audit_buffer *ab; |
7551ced3 | 1475 | struct audit_aux_data *aux; |
5195d8e2 | 1476 | struct audit_names *n; |
1da177e4 | 1477 | |
2a1fe215 | 1478 | context->personality = current->personality; |
e495149b AV |
1479 | |
1480 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1481 | if (!ab) |
1482 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1483 | audit_log_format(ab, "arch=%x syscall=%d", |
1484 | context->arch, context->major); | |
1da177e4 LT |
1485 | if (context->personality != PER_LINUX) |
1486 | audit_log_format(ab, " per=%lx", context->personality); | |
1487 | if (context->return_valid) | |
9f8dbe9c | 1488 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1489 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1490 | context->return_code); | |
eb84a20e | 1491 | |
1da177e4 | 1492 | audit_log_format(ab, |
e23eb920 PM |
1493 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1494 | context->argv[0], | |
1495 | context->argv[1], | |
1496 | context->argv[2], | |
1497 | context->argv[3], | |
1498 | context->name_count); | |
eb84a20e | 1499 | |
2a1fe215 | 1500 | audit_log_task_info(ab); |
9d960985 | 1501 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1502 | audit_log_end(ab); |
1da177e4 | 1503 | |
7551ced3 | 1504 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1505 | |
e495149b | 1506 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1507 | if (!ab) |
1508 | continue; /* audit_panic has been called */ | |
1509 | ||
1da177e4 | 1510 | switch (aux->type) { |
20ca73bc | 1511 | |
3fc689e9 EP |
1512 | case AUDIT_BPRM_FCAPS: { |
1513 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1514 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1515 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1516 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1517 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1518 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1519 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1520 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
7786f6b6 RGB |
1521 | audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient); |
1522 | audit_log_cap(ab, "pp", &axs->new_pcap.permitted); | |
1523 | audit_log_cap(ab, "pi", &axs->new_pcap.inheritable); | |
1524 | audit_log_cap(ab, "pe", &axs->new_pcap.effective); | |
1525 | audit_log_cap(ab, "pa", &axs->new_pcap.ambient); | |
2fec30e2 RGB |
1526 | audit_log_format(ab, " frootid=%d", |
1527 | from_kuid(&init_user_ns, | |
1528 | axs->fcap.rootid)); | |
3fc689e9 EP |
1529 | break; } |
1530 | ||
1da177e4 LT |
1531 | } |
1532 | audit_log_end(ab); | |
1da177e4 LT |
1533 | } |
1534 | ||
f3298dc4 | 1535 | if (context->type) |
a33e6751 | 1536 | show_special(context, &call_panic); |
f3298dc4 | 1537 | |
157cf649 AV |
1538 | if (context->fds[0] >= 0) { |
1539 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1540 | if (ab) { | |
1541 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1542 | context->fds[0], context->fds[1]); | |
1543 | audit_log_end(ab); | |
1544 | } | |
1545 | } | |
1546 | ||
4f6b434f AV |
1547 | if (context->sockaddr_len) { |
1548 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1549 | if (ab) { | |
1550 | audit_log_format(ab, "saddr="); | |
1551 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1552 | context->sockaddr_len); | |
1553 | audit_log_end(ab); | |
1554 | } | |
1555 | } | |
1556 | ||
e54dc243 AG |
1557 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1558 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1559 | |
1560 | for (i = 0; i < axs->pid_count; i++) | |
1561 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1562 | axs->target_auid[i], |
1563 | axs->target_uid[i], | |
4746ec5b | 1564 | axs->target_sessionid[i], |
c2a7780e EP |
1565 | axs->target_sid[i], |
1566 | axs->target_comm[i])) | |
e54dc243 | 1567 | call_panic = 1; |
a5cb013d AV |
1568 | } |
1569 | ||
e54dc243 AG |
1570 | if (context->target_pid && |
1571 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1572 | context->target_auid, context->target_uid, |
4746ec5b | 1573 | context->target_sessionid, |
c2a7780e | 1574 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1575 | call_panic = 1; |
1576 | ||
44707fdf | 1577 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1578 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1579 | if (ab) { |
0b7a0fdb | 1580 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1581 | audit_log_end(ab); |
1582 | } | |
1583 | } | |
73241ccc | 1584 | |
5195d8e2 | 1585 | i = 0; |
79f6530c JL |
1586 | list_for_each_entry(n, &context->names_list, list) { |
1587 | if (n->hidden) | |
1588 | continue; | |
b24a30a7 | 1589 | audit_log_name(context, n, NULL, i++, &call_panic); |
79f6530c | 1590 | } |
c0641f28 | 1591 | |
2a1fe215 | 1592 | audit_log_proctitle(); |
3f1c8250 | 1593 | |
c0641f28 EP |
1594 | /* Send end of event record to help user space know we are finished */ |
1595 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1596 | if (ab) | |
1597 | audit_log_end(ab); | |
9c7aa6aa SG |
1598 | if (call_panic) |
1599 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1600 | } |
1601 | ||
b0dd25a8 | 1602 | /** |
196a5085 | 1603 | * __audit_free - free a per-task audit context |
b0dd25a8 RD |
1604 | * @tsk: task whose audit context block to free |
1605 | * | |
fa84cb93 | 1606 | * Called from copy_process and do_exit |
b0dd25a8 | 1607 | */ |
a4ff8dba | 1608 | void __audit_free(struct task_struct *tsk) |
1da177e4 | 1609 | { |
2a1fe215 | 1610 | struct audit_context *context = tsk->audit_context; |
1da177e4 | 1611 | |
56179a6e | 1612 | if (!context) |
1da177e4 LT |
1613 | return; |
1614 | ||
9e36a5d4 RGB |
1615 | if (!list_empty(&context->killed_trees)) |
1616 | audit_kill_trees(context); | |
1617 | ||
2a1fe215 PM |
1618 | /* We are called either by do_exit() or the fork() error handling code; |
1619 | * in the former case tsk == current and in the latter tsk is a | |
1620 | * random task_struct that doesn't doesn't have any meaningful data we | |
1621 | * need to log via audit_log_exit(). | |
1622 | */ | |
1623 | if (tsk == current && !context->dummy && context->in_syscall) { | |
1624 | context->return_valid = 0; | |
1625 | context->return_code = 0; | |
1626 | ||
1627 | audit_filter_syscall(tsk, context, | |
1628 | &audit_filter_list[AUDIT_FILTER_EXIT]); | |
1629 | audit_filter_inodes(tsk, context); | |
1630 | if (context->current_state == AUDIT_RECORD_CONTEXT) | |
1631 | audit_log_exit(); | |
1632 | } | |
1633 | ||
2a1fe215 | 1634 | audit_set_context(tsk, NULL); |
1da177e4 LT |
1635 | audit_free_context(context); |
1636 | } | |
1637 | ||
b0dd25a8 | 1638 | /** |
196a5085 | 1639 | * __audit_syscall_entry - fill in an audit record at syscall entry |
b0dd25a8 RD |
1640 | * @major: major syscall type (function) |
1641 | * @a1: additional syscall register 1 | |
1642 | * @a2: additional syscall register 2 | |
1643 | * @a3: additional syscall register 3 | |
1644 | * @a4: additional syscall register 4 | |
1645 | * | |
1646 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1647 | * audit context was created when the task was created and the state or |
1648 | * filters demand the audit context be built. If the state from the | |
1649 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1650 | * then the record will be written at syscall exit time (otherwise, it | |
1651 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1652 | * be written). |
1653 | */ | |
b4f0d375 RGB |
1654 | void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2, |
1655 | unsigned long a3, unsigned long a4) | |
1da177e4 | 1656 | { |
cdfb6b34 | 1657 | struct audit_context *context = audit_context(); |
1da177e4 LT |
1658 | enum audit_state state; |
1659 | ||
94d14e3e | 1660 | if (!audit_enabled || !context) |
86a1c34a | 1661 | return; |
1da177e4 | 1662 | |
1da177e4 LT |
1663 | BUG_ON(context->in_syscall || context->name_count); |
1664 | ||
1da177e4 | 1665 | state = context->state; |
5260ecc2 RGB |
1666 | if (state == AUDIT_DISABLED) |
1667 | return; | |
1668 | ||
d51374ad | 1669 | context->dummy = !audit_n_rules; |
0590b933 AV |
1670 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1671 | context->prio = 0; | |
cdfb6b34 | 1672 | if (auditd_test_task(current)) |
5260ecc2 | 1673 | return; |
0590b933 | 1674 | } |
1da177e4 | 1675 | |
16add411 | 1676 | context->arch = syscall_get_arch(current); |
5260ecc2 RGB |
1677 | context->major = major; |
1678 | context->argv[0] = a1; | |
1679 | context->argv[1] = a2; | |
1680 | context->argv[2] = a3; | |
1681 | context->argv[3] = a4; | |
ce625a80 | 1682 | context->serial = 0; |
1da177e4 | 1683 | context->in_syscall = 1; |
0590b933 | 1684 | context->current_state = state; |
419c58f1 | 1685 | context->ppid = 0; |
290e44b7 | 1686 | ktime_get_coarse_real_ts64(&context->ctime); |
1da177e4 LT |
1687 | } |
1688 | ||
b0dd25a8 | 1689 | /** |
196a5085 | 1690 | * __audit_syscall_exit - deallocate audit context after a system call |
42ae610c RD |
1691 | * @success: success value of the syscall |
1692 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1693 | * |
1694 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1695 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1696 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1697 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1698 | * free the names stored from getname(). |
1699 | */ | |
d7e7528b | 1700 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 LT |
1701 | { |
1702 | struct audit_context *context; | |
1703 | ||
2a1fe215 | 1704 | context = audit_context(); |
56179a6e | 1705 | if (!context) |
97e94c45 | 1706 | return; |
1da177e4 | 1707 | |
9e36a5d4 RGB |
1708 | if (!list_empty(&context->killed_trees)) |
1709 | audit_kill_trees(context); | |
1710 | ||
2a1fe215 PM |
1711 | if (!context->dummy && context->in_syscall) { |
1712 | if (success) | |
1713 | context->return_valid = AUDITSC_SUCCESS; | |
1714 | else | |
1715 | context->return_valid = AUDITSC_FAILURE; | |
1716 | ||
1717 | /* | |
1718 | * we need to fix up the return code in the audit logs if the | |
1719 | * actual return codes are later going to be fixed up by the | |
1720 | * arch specific signal handlers | |
1721 | * | |
1722 | * This is actually a test for: | |
1723 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
1724 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
1725 | * | |
1726 | * but is faster than a bunch of || | |
1727 | */ | |
1728 | if (unlikely(return_code <= -ERESTARTSYS) && | |
1729 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
1730 | (return_code != -ENOIOCTLCMD)) | |
1731 | context->return_code = -EINTR; | |
1732 | else | |
1733 | context->return_code = return_code; | |
1734 | ||
1735 | audit_filter_syscall(current, context, | |
1736 | &audit_filter_list[AUDIT_FILTER_EXIT]); | |
1737 | audit_filter_inodes(current, context); | |
1738 | if (context->current_state == AUDIT_RECORD_CONTEXT) | |
1739 | audit_log_exit(); | |
1740 | } | |
1da177e4 LT |
1741 | |
1742 | context->in_syscall = 0; | |
0590b933 | 1743 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1744 | |
95e0b46f | 1745 | audit_free_module(context); |
c62d773a AV |
1746 | audit_free_names(context); |
1747 | unroll_tree_refs(context, NULL, 0); | |
1748 | audit_free_aux(context); | |
1749 | context->aux = NULL; | |
1750 | context->aux_pids = NULL; | |
1751 | context->target_pid = 0; | |
1752 | context->target_sid = 0; | |
1753 | context->sockaddr_len = 0; | |
1754 | context->type = 0; | |
1755 | context->fds[0] = -1; | |
1756 | if (context->state != AUDIT_RECORD_CONTEXT) { | |
1757 | kfree(context->filterkey); | |
1758 | context->filterkey = NULL; | |
1da177e4 | 1759 | } |
1da177e4 LT |
1760 | } |
1761 | ||
74c3cbe3 AV |
1762 | static inline void handle_one(const struct inode *inode) |
1763 | { | |
74c3cbe3 AV |
1764 | struct audit_context *context; |
1765 | struct audit_tree_refs *p; | |
1766 | struct audit_chunk *chunk; | |
1767 | int count; | |
08991e83 | 1768 | if (likely(!inode->i_fsnotify_marks)) |
74c3cbe3 | 1769 | return; |
cdfb6b34 | 1770 | context = audit_context(); |
74c3cbe3 AV |
1771 | p = context->trees; |
1772 | count = context->tree_count; | |
1773 | rcu_read_lock(); | |
1774 | chunk = audit_tree_lookup(inode); | |
1775 | rcu_read_unlock(); | |
1776 | if (!chunk) | |
1777 | return; | |
1778 | if (likely(put_tree_ref(context, chunk))) | |
1779 | return; | |
1780 | if (unlikely(!grow_tree_refs(context))) { | |
f952d10f | 1781 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1782 | audit_set_auditable(context); |
1783 | audit_put_chunk(chunk); | |
1784 | unroll_tree_refs(context, p, count); | |
1785 | return; | |
1786 | } | |
1787 | put_tree_ref(context, chunk); | |
74c3cbe3 AV |
1788 | } |
1789 | ||
1790 | static void handle_path(const struct dentry *dentry) | |
1791 | { | |
74c3cbe3 AV |
1792 | struct audit_context *context; |
1793 | struct audit_tree_refs *p; | |
1794 | const struct dentry *d, *parent; | |
1795 | struct audit_chunk *drop; | |
1796 | unsigned long seq; | |
1797 | int count; | |
1798 | ||
cdfb6b34 | 1799 | context = audit_context(); |
74c3cbe3 AV |
1800 | p = context->trees; |
1801 | count = context->tree_count; | |
1802 | retry: | |
1803 | drop = NULL; | |
1804 | d = dentry; | |
1805 | rcu_read_lock(); | |
1806 | seq = read_seqbegin(&rename_lock); | |
1807 | for(;;) { | |
3b362157 | 1808 | struct inode *inode = d_backing_inode(d); |
08991e83 | 1809 | if (inode && unlikely(inode->i_fsnotify_marks)) { |
74c3cbe3 AV |
1810 | struct audit_chunk *chunk; |
1811 | chunk = audit_tree_lookup(inode); | |
1812 | if (chunk) { | |
1813 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1814 | drop = chunk; | |
1815 | break; | |
1816 | } | |
1817 | } | |
1818 | } | |
1819 | parent = d->d_parent; | |
1820 | if (parent == d) | |
1821 | break; | |
1822 | d = parent; | |
1823 | } | |
1824 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1825 | rcu_read_unlock(); | |
1826 | if (!drop) { | |
1827 | /* just a race with rename */ | |
1828 | unroll_tree_refs(context, p, count); | |
1829 | goto retry; | |
1830 | } | |
1831 | audit_put_chunk(drop); | |
1832 | if (grow_tree_refs(context)) { | |
1833 | /* OK, got more space */ | |
1834 | unroll_tree_refs(context, p, count); | |
1835 | goto retry; | |
1836 | } | |
1837 | /* too bad */ | |
f952d10f | 1838 | pr_warn("out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1839 | unroll_tree_refs(context, p, count); |
1840 | audit_set_auditable(context); | |
1841 | return; | |
1842 | } | |
1843 | rcu_read_unlock(); | |
74c3cbe3 AV |
1844 | } |
1845 | ||
78e2e802 JL |
1846 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1847 | unsigned char type) | |
5195d8e2 EP |
1848 | { |
1849 | struct audit_names *aname; | |
1850 | ||
1851 | if (context->name_count < AUDIT_NAMES) { | |
1852 | aname = &context->preallocated_names[context->name_count]; | |
1853 | memset(aname, 0, sizeof(*aname)); | |
1854 | } else { | |
1855 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1856 | if (!aname) | |
1857 | return NULL; | |
1858 | aname->should_free = true; | |
1859 | } | |
1860 | ||
84cb777e | 1861 | aname->ino = AUDIT_INO_UNSET; |
78e2e802 | 1862 | aname->type = type; |
5195d8e2 EP |
1863 | list_add_tail(&aname->list, &context->names_list); |
1864 | ||
1865 | context->name_count++; | |
5195d8e2 EP |
1866 | return aname; |
1867 | } | |
1868 | ||
7ac86265 | 1869 | /** |
196a5085 | 1870 | * __audit_reusename - fill out filename with info from existing entry |
7ac86265 JL |
1871 | * @uptr: userland ptr to pathname |
1872 | * | |
1873 | * Search the audit_names list for the current audit context. If there is an | |
1874 | * existing entry with a matching "uptr" then return the filename | |
1875 | * associated with that audit_name. If not, return NULL. | |
1876 | */ | |
1877 | struct filename * | |
1878 | __audit_reusename(const __user char *uptr) | |
1879 | { | |
cdfb6b34 | 1880 | struct audit_context *context = audit_context(); |
7ac86265 JL |
1881 | struct audit_names *n; |
1882 | ||
1883 | list_for_each_entry(n, &context->names_list, list) { | |
1884 | if (!n->name) | |
1885 | continue; | |
55422d0b PM |
1886 | if (n->name->uptr == uptr) { |
1887 | n->name->refcnt++; | |
7ac86265 | 1888 | return n->name; |
55422d0b | 1889 | } |
7ac86265 JL |
1890 | } |
1891 | return NULL; | |
1892 | } | |
1893 | ||
b0dd25a8 | 1894 | /** |
196a5085 | 1895 | * __audit_getname - add a name to the list |
b0dd25a8 RD |
1896 | * @name: name to add |
1897 | * | |
1898 | * Add a name to the list of audit names for this context. | |
1899 | * Called from fs/namei.c:getname(). | |
1900 | */ | |
91a27b2a | 1901 | void __audit_getname(struct filename *name) |
1da177e4 | 1902 | { |
cdfb6b34 | 1903 | struct audit_context *context = audit_context(); |
5195d8e2 | 1904 | struct audit_names *n; |
1da177e4 | 1905 | |
55422d0b | 1906 | if (!context->in_syscall) |
1da177e4 | 1907 | return; |
91a27b2a | 1908 | |
78e2e802 | 1909 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
1910 | if (!n) |
1911 | return; | |
1912 | ||
1913 | n->name = name; | |
1914 | n->name_len = AUDIT_NAME_FULL; | |
adb5c247 | 1915 | name->aname = n; |
55422d0b | 1916 | name->refcnt++; |
5195d8e2 | 1917 | |
f7ad3c6b MS |
1918 | if (!context->pwd.dentry) |
1919 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
1920 | } |
1921 | ||
5f3d544f RGB |
1922 | static inline int audit_copy_fcaps(struct audit_names *name, |
1923 | const struct dentry *dentry) | |
1924 | { | |
1925 | struct cpu_vfs_cap_data caps; | |
1926 | int rc; | |
1927 | ||
1928 | if (!dentry) | |
1929 | return 0; | |
1930 | ||
1931 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
1932 | if (rc) | |
1933 | return rc; | |
1934 | ||
1935 | name->fcap.permitted = caps.permitted; | |
1936 | name->fcap.inheritable = caps.inheritable; | |
1937 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
1938 | name->fcap.rootid = caps.rootid; | |
1939 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> | |
1940 | VFS_CAP_REVISION_SHIFT; | |
1941 | ||
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | /* Copy inode data into an audit_names. */ | |
2efa48fe Y |
1946 | static void audit_copy_inode(struct audit_names *name, |
1947 | const struct dentry *dentry, | |
1948 | struct inode *inode, unsigned int flags) | |
5f3d544f RGB |
1949 | { |
1950 | name->ino = inode->i_ino; | |
1951 | name->dev = inode->i_sb->s_dev; | |
1952 | name->mode = inode->i_mode; | |
1953 | name->uid = inode->i_uid; | |
1954 | name->gid = inode->i_gid; | |
1955 | name->rdev = inode->i_rdev; | |
1956 | security_inode_getsecid(inode, &name->osid); | |
1957 | if (flags & AUDIT_INODE_NOEVAL) { | |
1958 | name->fcap_ver = -1; | |
1959 | return; | |
1960 | } | |
1961 | audit_copy_fcaps(name, dentry); | |
1962 | } | |
1963 | ||
b0dd25a8 | 1964 | /** |
bfcec708 | 1965 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 1966 | * @name: name being audited |
481968f4 | 1967 | * @dentry: dentry being audited |
79f6530c | 1968 | * @flags: attributes for this particular entry |
b0dd25a8 | 1969 | */ |
adb5c247 | 1970 | void __audit_inode(struct filename *name, const struct dentry *dentry, |
79f6530c | 1971 | unsigned int flags) |
1da177e4 | 1972 | { |
cdfb6b34 | 1973 | struct audit_context *context = audit_context(); |
d6335d77 | 1974 | struct inode *inode = d_backing_inode(dentry); |
5195d8e2 | 1975 | struct audit_names *n; |
79f6530c | 1976 | bool parent = flags & AUDIT_INODE_PARENT; |
a252f56a RGB |
1977 | struct audit_entry *e; |
1978 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
1979 | int i; | |
1da177e4 LT |
1980 | |
1981 | if (!context->in_syscall) | |
1982 | return; | |
5195d8e2 | 1983 | |
a252f56a | 1984 | rcu_read_lock(); |
699c1868 RGB |
1985 | list_for_each_entry_rcu(e, list, list) { |
1986 | for (i = 0; i < e->rule.field_count; i++) { | |
1987 | struct audit_field *f = &e->rule.fields[i]; | |
1988 | ||
1989 | if (f->type == AUDIT_FSTYPE | |
1990 | && audit_comparator(inode->i_sb->s_magic, | |
1991 | f->op, f->val) | |
1992 | && e->rule.action == AUDIT_NEVER) { | |
1993 | rcu_read_unlock(); | |
1994 | return; | |
a252f56a RGB |
1995 | } |
1996 | } | |
1997 | } | |
1998 | rcu_read_unlock(); | |
1999 | ||
9cec9d68 JL |
2000 | if (!name) |
2001 | goto out_alloc; | |
2002 | ||
adb5c247 JL |
2003 | /* |
2004 | * If we have a pointer to an audit_names entry already, then we can | |
2005 | * just use it directly if the type is correct. | |
2006 | */ | |
2007 | n = name->aname; | |
2008 | if (n) { | |
2009 | if (parent) { | |
2010 | if (n->type == AUDIT_TYPE_PARENT || | |
2011 | n->type == AUDIT_TYPE_UNKNOWN) | |
2012 | goto out; | |
2013 | } else { | |
2014 | if (n->type != AUDIT_TYPE_PARENT) | |
2015 | goto out; | |
2016 | } | |
2017 | } | |
2018 | ||
5195d8e2 | 2019 | list_for_each_entry_reverse(n, &context->names_list, list) { |
57c59f58 PM |
2020 | if (n->ino) { |
2021 | /* valid inode number, use that for the comparison */ | |
2022 | if (n->ino != inode->i_ino || | |
2023 | n->dev != inode->i_sb->s_dev) | |
2024 | continue; | |
2025 | } else if (n->name) { | |
2026 | /* inode number has not been set, check the name */ | |
2027 | if (strcmp(n->name->name, name->name)) | |
2028 | continue; | |
2029 | } else | |
2030 | /* no inode and no name (?!) ... this is odd ... */ | |
bfcec708 JL |
2031 | continue; |
2032 | ||
2033 | /* match the correct record type */ | |
2034 | if (parent) { | |
2035 | if (n->type == AUDIT_TYPE_PARENT || | |
2036 | n->type == AUDIT_TYPE_UNKNOWN) | |
2037 | goto out; | |
2038 | } else { | |
2039 | if (n->type != AUDIT_TYPE_PARENT) | |
2040 | goto out; | |
2041 | } | |
1da177e4 | 2042 | } |
5195d8e2 | 2043 | |
9cec9d68 | 2044 | out_alloc: |
4a928436 PM |
2045 | /* unable to find an entry with both a matching name and type */ |
2046 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); | |
5195d8e2 EP |
2047 | if (!n) |
2048 | return; | |
fcf22d82 | 2049 | if (name) { |
fd3522fd | 2050 | n->name = name; |
55422d0b | 2051 | name->refcnt++; |
fcf22d82 | 2052 | } |
4a928436 | 2053 | |
5195d8e2 | 2054 | out: |
bfcec708 | 2055 | if (parent) { |
91a27b2a | 2056 | n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec708 | 2057 | n->type = AUDIT_TYPE_PARENT; |
79f6530c JL |
2058 | if (flags & AUDIT_INODE_HIDDEN) |
2059 | n->hidden = true; | |
bfcec708 JL |
2060 | } else { |
2061 | n->name_len = AUDIT_NAME_FULL; | |
2062 | n->type = AUDIT_TYPE_NORMAL; | |
2063 | } | |
74c3cbe3 | 2064 | handle_path(dentry); |
57d46577 | 2065 | audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL); |
73241ccc AG |
2066 | } |
2067 | ||
9f45f5bf AV |
2068 | void __audit_file(const struct file *file) |
2069 | { | |
2070 | __audit_inode(NULL, file->f_path.dentry, 0); | |
2071 | } | |
2072 | ||
73241ccc | 2073 | /** |
c43a25ab | 2074 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 2075 | * @parent: inode of dentry parent |
c43a25ab | 2076 | * @dentry: dentry being audited |
4fa6b5ec | 2077 | * @type: AUDIT_TYPE_* value that we're looking for |
73241ccc AG |
2078 | * |
2079 | * For syscalls that create or remove filesystem objects, audit_inode | |
2080 | * can only collect information for the filesystem object's parent. | |
2081 | * This call updates the audit context with the child's information. | |
2082 | * Syscalls that create a new filesystem object must be hooked after | |
2083 | * the object is created. Syscalls that remove a filesystem object | |
2084 | * must be hooked prior, in order to capture the target inode during | |
2085 | * unsuccessful attempts. | |
2086 | */ | |
d6335d77 | 2087 | void __audit_inode_child(struct inode *parent, |
4fa6b5ec JL |
2088 | const struct dentry *dentry, |
2089 | const unsigned char type) | |
73241ccc | 2090 | { |
cdfb6b34 | 2091 | struct audit_context *context = audit_context(); |
d6335d77 | 2092 | struct inode *inode = d_backing_inode(dentry); |
795d673a | 2093 | const struct qstr *dname = &dentry->d_name; |
4fa6b5ec | 2094 | struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
42d5e376 RGB |
2095 | struct audit_entry *e; |
2096 | struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS]; | |
2097 | int i; | |
73241ccc AG |
2098 | |
2099 | if (!context->in_syscall) | |
2100 | return; | |
2101 | ||
42d5e376 | 2102 | rcu_read_lock(); |
699c1868 RGB |
2103 | list_for_each_entry_rcu(e, list, list) { |
2104 | for (i = 0; i < e->rule.field_count; i++) { | |
2105 | struct audit_field *f = &e->rule.fields[i]; | |
2106 | ||
2107 | if (f->type == AUDIT_FSTYPE | |
2108 | && audit_comparator(parent->i_sb->s_magic, | |
2109 | f->op, f->val) | |
2110 | && e->rule.action == AUDIT_NEVER) { | |
2111 | rcu_read_unlock(); | |
2112 | return; | |
42d5e376 RGB |
2113 | } |
2114 | } | |
2115 | } | |
2116 | rcu_read_unlock(); | |
2117 | ||
74c3cbe3 AV |
2118 | if (inode) |
2119 | handle_one(inode); | |
73241ccc | 2120 | |
4fa6b5ec | 2121 | /* look for a parent entry first */ |
5195d8e2 | 2122 | list_for_each_entry(n, &context->names_list, list) { |
57c59f58 PM |
2123 | if (!n->name || |
2124 | (n->type != AUDIT_TYPE_PARENT && | |
2125 | n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
2126 | continue; |
2127 | ||
57c59f58 PM |
2128 | if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev && |
2129 | !audit_compare_dname_path(dname, | |
2130 | n->name->name, n->name_len)) { | |
2131 | if (n->type == AUDIT_TYPE_UNKNOWN) | |
2132 | n->type = AUDIT_TYPE_PARENT; | |
4fa6b5ec JL |
2133 | found_parent = n; |
2134 | break; | |
f368c07d | 2135 | } |
5712e88f | 2136 | } |
73241ccc | 2137 | |
4fa6b5ec | 2138 | /* is there a matching child entry? */ |
5195d8e2 | 2139 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec | 2140 | /* can only match entries that have a name */ |
57c59f58 PM |
2141 | if (!n->name || |
2142 | (n->type != type && n->type != AUDIT_TYPE_UNKNOWN)) | |
5712e88f AG |
2143 | continue; |
2144 | ||
795d673a | 2145 | if (!strcmp(dname->name, n->name->name) || |
91a27b2a | 2146 | !audit_compare_dname_path(dname, n->name->name, |
4fa6b5ec JL |
2147 | found_parent ? |
2148 | found_parent->name_len : | |
e3d6b07b | 2149 | AUDIT_NAME_FULL)) { |
57c59f58 PM |
2150 | if (n->type == AUDIT_TYPE_UNKNOWN) |
2151 | n->type = type; | |
4fa6b5ec JL |
2152 | found_child = n; |
2153 | break; | |
5712e88f | 2154 | } |
ac9910ce | 2155 | } |
5712e88f | 2156 | |
5712e88f | 2157 | if (!found_parent) { |
4fa6b5ec JL |
2158 | /* create a new, "anonymous" parent record */ |
2159 | n = audit_alloc_name(context, AUDIT_TYPE_PARENT); | |
5195d8e2 | 2160 | if (!n) |
ac9910ce | 2161 | return; |
57d46577 | 2162 | audit_copy_inode(n, NULL, parent, 0); |
73d3ec5a | 2163 | } |
5712e88f AG |
2164 | |
2165 | if (!found_child) { | |
4fa6b5ec JL |
2166 | found_child = audit_alloc_name(context, type); |
2167 | if (!found_child) | |
5712e88f | 2168 | return; |
5712e88f AG |
2169 | |
2170 | /* Re-use the name belonging to the slot for a matching parent | |
2171 | * directory. All names for this context are relinquished in | |
2172 | * audit_free_names() */ | |
2173 | if (found_parent) { | |
4fa6b5ec JL |
2174 | found_child->name = found_parent->name; |
2175 | found_child->name_len = AUDIT_NAME_FULL; | |
55422d0b | 2176 | found_child->name->refcnt++; |
5712e88f | 2177 | } |
5712e88f | 2178 | } |
57c59f58 | 2179 | |
4fa6b5ec | 2180 | if (inode) |
57d46577 | 2181 | audit_copy_inode(found_child, dentry, inode, 0); |
4fa6b5ec | 2182 | else |
84cb777e | 2183 | found_child->ino = AUDIT_INO_UNSET; |
3e2efce0 | 2184 | } |
50e437d5 | 2185 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2186 | |
b0dd25a8 RD |
2187 | /** |
2188 | * auditsc_get_stamp - get local copies of audit_context values | |
2189 | * @ctx: audit_context for the task | |
2115bb25 | 2190 | * @t: timespec64 to store time recorded in the audit_context |
b0dd25a8 RD |
2191 | * @serial: serial value that is recorded in the audit_context |
2192 | * | |
2193 | * Also sets the context as auditable. | |
2194 | */ | |
48887e63 | 2195 | int auditsc_get_stamp(struct audit_context *ctx, |
2115bb25 | 2196 | struct timespec64 *t, unsigned int *serial) |
1da177e4 | 2197 | { |
48887e63 AV |
2198 | if (!ctx->in_syscall) |
2199 | return 0; | |
ce625a80 DW |
2200 | if (!ctx->serial) |
2201 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2202 | t->tv_sec = ctx->ctime.tv_sec; |
2203 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2204 | *serial = ctx->serial; | |
0590b933 AV |
2205 | if (!ctx->prio) { |
2206 | ctx->prio = 1; | |
2207 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
2208 | } | |
48887e63 | 2209 | return 1; |
1da177e4 LT |
2210 | } |
2211 | ||
20ca73bc GW |
2212 | /** |
2213 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2214 | * @oflag: open flag | |
2215 | * @mode: mode bits | |
6b962559 | 2216 | * @attr: queue attributes |
20ca73bc | 2217 | * |
20ca73bc | 2218 | */ |
df0a4283 | 2219 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2220 | { |
cdfb6b34 | 2221 | struct audit_context *context = audit_context(); |
20ca73bc | 2222 | |
564f6993 AV |
2223 | if (attr) |
2224 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2225 | else | |
2226 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2227 | |
564f6993 AV |
2228 | context->mq_open.oflag = oflag; |
2229 | context->mq_open.mode = mode; | |
20ca73bc | 2230 | |
564f6993 | 2231 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2232 | } |
2233 | ||
2234 | /** | |
c32c8af4 | 2235 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2236 | * @mqdes: MQ descriptor |
2237 | * @msg_len: Message length | |
2238 | * @msg_prio: Message priority | |
c32c8af4 | 2239 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2240 | * |
20ca73bc | 2241 | */ |
c32c8af4 | 2242 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
b9047726 | 2243 | const struct timespec64 *abs_timeout) |
20ca73bc | 2244 | { |
cdfb6b34 | 2245 | struct audit_context *context = audit_context(); |
b9047726 | 2246 | struct timespec64 *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2247 | |
c32c8af4 | 2248 | if (abs_timeout) |
b9047726 | 2249 | memcpy(p, abs_timeout, sizeof(*p)); |
c32c8af4 | 2250 | else |
b9047726 | 2251 | memset(p, 0, sizeof(*p)); |
20ca73bc | 2252 | |
c32c8af4 AV |
2253 | context->mq_sendrecv.mqdes = mqdes; |
2254 | context->mq_sendrecv.msg_len = msg_len; | |
2255 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2256 | |
c32c8af4 | 2257 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2258 | } |
2259 | ||
2260 | /** | |
2261 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2262 | * @mqdes: MQ descriptor | |
6b962559 | 2263 | * @notification: Notification event |
20ca73bc | 2264 | * |
20ca73bc GW |
2265 | */ |
2266 | ||
20114f71 | 2267 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2268 | { |
cdfb6b34 | 2269 | struct audit_context *context = audit_context(); |
20ca73bc | 2270 | |
20114f71 AV |
2271 | if (notification) |
2272 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2273 | else | |
2274 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2275 | |
20114f71 AV |
2276 | context->mq_notify.mqdes = mqdes; |
2277 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2278 | } |
2279 | ||
2280 | /** | |
2281 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2282 | * @mqdes: MQ descriptor | |
2283 | * @mqstat: MQ flags | |
2284 | * | |
20ca73bc | 2285 | */ |
7392906e | 2286 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2287 | { |
cdfb6b34 | 2288 | struct audit_context *context = audit_context(); |
7392906e AV |
2289 | context->mq_getsetattr.mqdes = mqdes; |
2290 | context->mq_getsetattr.mqstat = *mqstat; | |
2291 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2292 | } |
2293 | ||
b0dd25a8 | 2294 | /** |
196a5085 | 2295 | * __audit_ipc_obj - record audit data for ipc object |
073115d6 SG |
2296 | * @ipcp: ipc permissions |
2297 | * | |
073115d6 | 2298 | */ |
a33e6751 | 2299 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2300 | { |
cdfb6b34 | 2301 | struct audit_context *context = audit_context(); |
a33e6751 AV |
2302 | context->ipc.uid = ipcp->uid; |
2303 | context->ipc.gid = ipcp->gid; | |
2304 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2305 | context->ipc.has_perm = 0; |
a33e6751 AV |
2306 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2307 | context->type = AUDIT_IPC; | |
073115d6 SG |
2308 | } |
2309 | ||
2310 | /** | |
196a5085 | 2311 | * __audit_ipc_set_perm - record audit data for new ipc permissions |
b0dd25a8 RD |
2312 | * @qbytes: msgq bytes |
2313 | * @uid: msgq user id | |
2314 | * @gid: msgq group id | |
2315 | * @mode: msgq mode (permissions) | |
2316 | * | |
e816f370 | 2317 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2318 | */ |
2570ebbd | 2319 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2320 | { |
cdfb6b34 | 2321 | struct audit_context *context = audit_context(); |
1da177e4 | 2322 | |
e816f370 AV |
2323 | context->ipc.qbytes = qbytes; |
2324 | context->ipc.perm_uid = uid; | |
2325 | context->ipc.perm_gid = gid; | |
2326 | context->ipc.perm_mode = mode; | |
2327 | context->ipc.has_perm = 1; | |
1da177e4 | 2328 | } |
c2f0c7c3 | 2329 | |
d9cfea91 | 2330 | void __audit_bprm(struct linux_binprm *bprm) |
473ae30b | 2331 | { |
cdfb6b34 | 2332 | struct audit_context *context = audit_context(); |
473ae30b | 2333 | |
d9cfea91 RGB |
2334 | context->type = AUDIT_EXECVE; |
2335 | context->execve.argc = bprm->argc; | |
473ae30b AV |
2336 | } |
2337 | ||
2338 | ||
b0dd25a8 | 2339 | /** |
196a5085 | 2340 | * __audit_socketcall - record audit data for sys_socketcall |
2950fa9d | 2341 | * @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a8 RD |
2342 | * @args: args array |
2343 | * | |
b0dd25a8 | 2344 | */ |
2950fa9d | 2345 | int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2346 | { |
cdfb6b34 | 2347 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2348 | |
2950fa9d CG |
2349 | if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) |
2350 | return -EINVAL; | |
f3298dc4 AV |
2351 | context->type = AUDIT_SOCKETCALL; |
2352 | context->socketcall.nargs = nargs; | |
2353 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
2950fa9d | 2354 | return 0; |
3ec3b2fb DW |
2355 | } |
2356 | ||
db349509 AV |
2357 | /** |
2358 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2359 | * @fd1: the first file descriptor | |
2360 | * @fd2: the second file descriptor | |
2361 | * | |
db349509 | 2362 | */ |
157cf649 | 2363 | void __audit_fd_pair(int fd1, int fd2) |
db349509 | 2364 | { |
cdfb6b34 | 2365 | struct audit_context *context = audit_context(); |
157cf649 AV |
2366 | context->fds[0] = fd1; |
2367 | context->fds[1] = fd2; | |
db349509 AV |
2368 | } |
2369 | ||
b0dd25a8 | 2370 | /** |
196a5085 | 2371 | * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto |
b0dd25a8 RD |
2372 | * @len: data length in user space |
2373 | * @a: data address in kernel space | |
2374 | * | |
2375 | * Returns 0 for success or NULL context or < 0 on error. | |
2376 | */ | |
07c49417 | 2377 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2378 | { |
cdfb6b34 | 2379 | struct audit_context *context = audit_context(); |
3ec3b2fb | 2380 | |
4f6b434f AV |
2381 | if (!context->sockaddr) { |
2382 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2383 | if (!p) | |
2384 | return -ENOMEM; | |
2385 | context->sockaddr = p; | |
2386 | } | |
3ec3b2fb | 2387 | |
4f6b434f AV |
2388 | context->sockaddr_len = len; |
2389 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2390 | return 0; |
2391 | } | |
2392 | ||
a5cb013d AV |
2393 | void __audit_ptrace(struct task_struct *t) |
2394 | { | |
cdfb6b34 | 2395 | struct audit_context *context = audit_context(); |
a5cb013d | 2396 | |
fa2bea2f | 2397 | context->target_pid = task_tgid_nr(t); |
c2a7780e | 2398 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2399 | context->target_uid = task_uid(t); |
4746ec5b | 2400 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2401 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2402 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2403 | } |
2404 | ||
b0dd25a8 | 2405 | /** |
b48345aa | 2406 | * audit_signal_info_syscall - record signal info for syscalls |
b0dd25a8 RD |
2407 | * @t: task being signaled |
2408 | * | |
2409 | * If the audit subsystem is being terminated, record the task (pid) | |
2410 | * and uid that is doing that. | |
2411 | */ | |
b48345aa | 2412 | int audit_signal_info_syscall(struct task_struct *t) |
c2f0c7c3 | 2413 | { |
e54dc243 | 2414 | struct audit_aux_data_pids *axp; |
cdfb6b34 | 2415 | struct audit_context *ctx = audit_context(); |
b48345aa | 2416 | kuid_t t_uid = task_uid(t); |
e54dc243 | 2417 | |
ab6434a1 PM |
2418 | if (!audit_signals || audit_dummy_context()) |
2419 | return 0; | |
2420 | ||
e54dc243 AG |
2421 | /* optimize the common case by putting first signal recipient directly |
2422 | * in audit_context */ | |
2423 | if (!ctx->target_pid) { | |
f1dc4867 | 2424 | ctx->target_pid = task_tgid_nr(t); |
c2a7780e | 2425 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2426 | ctx->target_uid = t_uid; |
4746ec5b | 2427 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2428 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2429 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2430 | return 0; |
2431 | } | |
2432 | ||
2433 | axp = (void *)ctx->aux_pids; | |
2434 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2435 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2436 | if (!axp) | |
2437 | return -ENOMEM; | |
2438 | ||
2439 | axp->d.type = AUDIT_OBJ_PID; | |
2440 | axp->d.next = ctx->aux_pids; | |
2441 | ctx->aux_pids = (void *)axp; | |
2442 | } | |
88ae704c | 2443 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 | 2444 | |
f1dc4867 | 2445 | axp->target_pid[axp->pid_count] = task_tgid_nr(t); |
c2a7780e | 2446 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2447 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2448 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2449 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2450 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2451 | axp->pid_count++; |
2452 | ||
2453 | return 0; | |
c2f0c7c3 | 2454 | } |
0a4ff8c2 | 2455 | |
3fc689e9 EP |
2456 | /** |
2457 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2458 | * @bprm: pointer to the bprm being processed |
2459 | * @new: the proposed new credentials | |
2460 | * @old: the old credentials | |
3fc689e9 EP |
2461 | * |
2462 | * Simply check if the proc already has the caps given by the file and if not | |
2463 | * store the priv escalation info for later auditing at the end of the syscall | |
2464 | * | |
3fc689e9 EP |
2465 | * -Eric |
2466 | */ | |
d84f4f99 DH |
2467 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2468 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2469 | { |
2470 | struct audit_aux_data_bprm_fcaps *ax; | |
cdfb6b34 | 2471 | struct audit_context *context = audit_context(); |
3fc689e9 | 2472 | struct cpu_vfs_cap_data vcaps; |
3fc689e9 EP |
2473 | |
2474 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2475 | if (!ax) | |
d84f4f99 | 2476 | return -ENOMEM; |
3fc689e9 EP |
2477 | |
2478 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2479 | ax->d.next = context->aux; | |
2480 | context->aux = (void *)ax; | |
2481 | ||
f4a4a8b1 | 2482 | get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps); |
3fc689e9 EP |
2483 | |
2484 | ax->fcap.permitted = vcaps.permitted; | |
2485 | ax->fcap.inheritable = vcaps.inheritable; | |
2486 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2fec30e2 | 2487 | ax->fcap.rootid = vcaps.rootid; |
3fc689e9 EP |
2488 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; |
2489 | ||
d84f4f99 DH |
2490 | ax->old_pcap.permitted = old->cap_permitted; |
2491 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2492 | ax->old_pcap.effective = old->cap_effective; | |
7786f6b6 | 2493 | ax->old_pcap.ambient = old->cap_ambient; |
3fc689e9 | 2494 | |
d84f4f99 DH |
2495 | ax->new_pcap.permitted = new->cap_permitted; |
2496 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2497 | ax->new_pcap.effective = new->cap_effective; | |
7786f6b6 | 2498 | ax->new_pcap.ambient = new->cap_ambient; |
d84f4f99 | 2499 | return 0; |
3fc689e9 EP |
2500 | } |
2501 | ||
e68b75a0 EP |
2502 | /** |
2503 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2504 | * @new: the new credentials |
2505 | * @old: the old (current) credentials | |
e68b75a0 | 2506 | * |
da3dae54 | 2507 | * Record the arguments userspace sent to sys_capset for later printing by the |
e68b75a0 EP |
2508 | * audit system if applicable |
2509 | */ | |
ca24a23e | 2510 | void __audit_log_capset(const struct cred *new, const struct cred *old) |
e68b75a0 | 2511 | { |
cdfb6b34 | 2512 | struct audit_context *context = audit_context(); |
fa2bea2f | 2513 | context->capset.pid = task_tgid_nr(current); |
57f71a0a AV |
2514 | context->capset.cap.effective = new->cap_effective; |
2515 | context->capset.cap.inheritable = new->cap_effective; | |
2516 | context->capset.cap.permitted = new->cap_permitted; | |
7786f6b6 | 2517 | context->capset.cap.ambient = new->cap_ambient; |
57f71a0a | 2518 | context->type = AUDIT_CAPSET; |
e68b75a0 EP |
2519 | } |
2520 | ||
120a795d AV |
2521 | void __audit_mmap_fd(int fd, int flags) |
2522 | { | |
cdfb6b34 | 2523 | struct audit_context *context = audit_context(); |
120a795d AV |
2524 | context->mmap.fd = fd; |
2525 | context->mmap.flags = flags; | |
2526 | context->type = AUDIT_MMAP; | |
2527 | } | |
2528 | ||
ca86cad7 RGB |
2529 | void __audit_log_kern_module(char *name) |
2530 | { | |
cdfb6b34 | 2531 | struct audit_context *context = audit_context(); |
ca86cad7 | 2532 | |
b305f7ed YW |
2533 | context->module.name = kstrdup(name, GFP_KERNEL); |
2534 | if (!context->module.name) | |
2535 | audit_log_lost("out of memory in __audit_log_kern_module"); | |
ca86cad7 RGB |
2536 | context->type = AUDIT_KERN_MODULE; |
2537 | } | |
2538 | ||
de8cd83e SG |
2539 | void __audit_fanotify(unsigned int response) |
2540 | { | |
cdfb6b34 | 2541 | audit_log(audit_context(), GFP_KERNEL, |
de8cd83e SG |
2542 | AUDIT_FANOTIFY, "resp=%u", response); |
2543 | } | |
2544 | ||
2d87a067 OM |
2545 | void __audit_tk_injoffset(struct timespec64 offset) |
2546 | { | |
2547 | audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_INJOFFSET, | |
2548 | "sec=%lli nsec=%li", | |
2549 | (long long)offset.tv_sec, offset.tv_nsec); | |
2550 | } | |
2551 | ||
7e8eda73 OM |
2552 | static void audit_log_ntp_val(const struct audit_ntp_data *ad, |
2553 | const char *op, enum audit_ntp_type type) | |
2554 | { | |
2555 | const struct audit_ntp_val *val = &ad->vals[type]; | |
2556 | ||
2557 | if (val->newval == val->oldval) | |
2558 | return; | |
2559 | ||
2560 | audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL, | |
2561 | "op=%s old=%lli new=%lli", op, val->oldval, val->newval); | |
2562 | } | |
2563 | ||
2564 | void __audit_ntp_log(const struct audit_ntp_data *ad) | |
2565 | { | |
2566 | audit_log_ntp_val(ad, "offset", AUDIT_NTP_OFFSET); | |
2567 | audit_log_ntp_val(ad, "freq", AUDIT_NTP_FREQ); | |
2568 | audit_log_ntp_val(ad, "status", AUDIT_NTP_STATUS); | |
2569 | audit_log_ntp_val(ad, "tai", AUDIT_NTP_TAI); | |
2570 | audit_log_ntp_val(ad, "tick", AUDIT_NTP_TICK); | |
2571 | audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST); | |
2572 | } | |
2573 | ||
c4dad0aa | 2574 | void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries, |
14224039 | 2575 | enum audit_nfcfgop op, gfp_t gfp) |
c4dad0aa RGB |
2576 | { |
2577 | struct audit_buffer *ab; | |
9d44a121 | 2578 | char comm[sizeof(current->comm)]; |
c4dad0aa | 2579 | |
14224039 | 2580 | ab = audit_log_start(audit_context(), gfp, AUDIT_NETFILTER_CFG); |
c4dad0aa RGB |
2581 | if (!ab) |
2582 | return; | |
2583 | audit_log_format(ab, "table=%s family=%u entries=%u op=%s", | |
2584 | name, af, nentries, audit_nfcfgs[op].s); | |
9d44a121 RGB |
2585 | |
2586 | audit_log_format(ab, " pid=%u", task_pid_nr(current)); | |
2587 | audit_log_task_context(ab); /* subj= */ | |
2588 | audit_log_format(ab, " comm="); | |
2589 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); | |
c4dad0aa RGB |
2590 | audit_log_end(ab); |
2591 | } | |
2592 | EXPORT_SYMBOL_GPL(__audit_log_nfcfg); | |
2593 | ||
7b9205bd | 2594 | static void audit_log_task(struct audit_buffer *ab) |
85e7bac3 | 2595 | { |
cca080d9 EB |
2596 | kuid_t auid, uid; |
2597 | kgid_t gid; | |
85e7bac3 | 2598 | unsigned int sessionid; |
9eab339b | 2599 | char comm[sizeof(current->comm)]; |
85e7bac3 EP |
2600 | |
2601 | auid = audit_get_loginuid(current); | |
2602 | sessionid = audit_get_sessionid(current); | |
2603 | current_uid_gid(&uid, &gid); | |
2604 | ||
2605 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2606 | from_kuid(&init_user_ns, auid), |
2607 | from_kuid(&init_user_ns, uid), | |
2608 | from_kgid(&init_user_ns, gid), | |
2609 | sessionid); | |
85e7bac3 | 2610 | audit_log_task_context(ab); |
fa2bea2f | 2611 | audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current)); |
9eab339b | 2612 | audit_log_untrustedstring(ab, get_task_comm(comm, current)); |
4766b199 | 2613 | audit_log_d_path_exe(ab, current->mm); |
7b9205bd KC |
2614 | } |
2615 | ||
0a4ff8c2 SG |
2616 | /** |
2617 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2618 | * @signr: signal value |
0a4ff8c2 SG |
2619 | * |
2620 | * If a process ends with a core dump, something fishy is going on and we | |
2621 | * should record the event for investigation. | |
2622 | */ | |
2623 | void audit_core_dumps(long signr) | |
2624 | { | |
2625 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2626 | |
2627 | if (!audit_enabled) | |
2628 | return; | |
2629 | ||
2630 | if (signr == SIGQUIT) /* don't care for those */ | |
2631 | return; | |
2632 | ||
d87de4a8 | 2633 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND); |
0644ec0c KC |
2634 | if (unlikely(!ab)) |
2635 | return; | |
61c0ee87 | 2636 | audit_log_task(ab); |
89670aff | 2637 | audit_log_format(ab, " sig=%ld res=1", signr); |
85e7bac3 EP |
2638 | audit_log_end(ab); |
2639 | } | |
0a4ff8c2 | 2640 | |
326bee02 TH |
2641 | /** |
2642 | * audit_seccomp - record information about a seccomp action | |
2643 | * @syscall: syscall number | |
2644 | * @signr: signal value | |
2645 | * @code: the seccomp action | |
2646 | * | |
2647 | * Record the information associated with a seccomp action. Event filtering for | |
2648 | * seccomp actions that are not to be logged is done in seccomp_log(). | |
2649 | * Therefore, this function forces auditing independent of the audit_enabled | |
2650 | * and dummy context state because seccomp actions should be logged even when | |
2651 | * audit is not in use. | |
2652 | */ | |
2653 | void audit_seccomp(unsigned long syscall, long signr, int code) | |
85e7bac3 EP |
2654 | { |
2655 | struct audit_buffer *ab; | |
2656 | ||
9b8753ff | 2657 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP); |
7b9205bd KC |
2658 | if (unlikely(!ab)) |
2659 | return; | |
2660 | audit_log_task(ab); | |
84db564a | 2661 | audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x", |
16add411 | 2662 | signr, syscall_get_arch(current), syscall, |
efbc0fbf | 2663 | in_compat_syscall(), KSTK_EIP(current), code); |
0a4ff8c2 SG |
2664 | audit_log_end(ab); |
2665 | } | |
916d7576 | 2666 | |
ea6eca77 TH |
2667 | void audit_seccomp_actions_logged(const char *names, const char *old_names, |
2668 | int res) | |
2669 | { | |
2670 | struct audit_buffer *ab; | |
2671 | ||
2672 | if (!audit_enabled) | |
2673 | return; | |
2674 | ||
8982a1fb | 2675 | ab = audit_log_start(audit_context(), GFP_KERNEL, |
ea6eca77 TH |
2676 | AUDIT_CONFIG_CHANGE); |
2677 | if (unlikely(!ab)) | |
2678 | return; | |
2679 | ||
d0a3f18a PM |
2680 | audit_log_format(ab, |
2681 | "op=seccomp-logging actions=%s old-actions=%s res=%d", | |
2682 | names, old_names, res); | |
ea6eca77 TH |
2683 | audit_log_end(ab); |
2684 | } | |
2685 | ||
916d7576 AV |
2686 | struct list_head *audit_killed_trees(void) |
2687 | { | |
cdfb6b34 | 2688 | struct audit_context *ctx = audit_context(); |
916d7576 AV |
2689 | if (likely(!ctx || !ctx->in_syscall)) |
2690 | return NULL; | |
2691 | return &ctx->killed_trees; | |
2692 | } |