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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 | ||
45 | #include <linux/init.h> | |
1da177e4 | 46 | #include <asm/types.h> |
60063497 | 47 | #include <linux/atomic.h> |
73241ccc AG |
48 | #include <linux/fs.h> |
49 | #include <linux/namei.h> | |
1da177e4 | 50 | #include <linux/mm.h> |
9984de1a | 51 | #include <linux/export.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
01116105 | 53 | #include <linux/mount.h> |
3ec3b2fb | 54 | #include <linux/socket.h> |
20ca73bc | 55 | #include <linux/mqueue.h> |
1da177e4 LT |
56 | #include <linux/audit.h> |
57 | #include <linux/personality.h> | |
58 | #include <linux/time.h> | |
5bb289b5 | 59 | #include <linux/netlink.h> |
f5561964 | 60 | #include <linux/compiler.h> |
1da177e4 | 61 | #include <asm/unistd.h> |
8c8570fb | 62 | #include <linux/security.h> |
fe7752ba | 63 | #include <linux/list.h> |
a6c043a8 | 64 | #include <linux/tty.h> |
473ae30b | 65 | #include <linux/binfmts.h> |
a1f8e7f7 | 66 | #include <linux/highmem.h> |
f46038ff | 67 | #include <linux/syscalls.h> |
851f7ff5 | 68 | #include <linux/capability.h> |
5ad4e53b | 69 | #include <linux/fs_struct.h> |
3dc1c1b2 | 70 | #include <linux/compat.h> |
1da177e4 | 71 | |
fe7752ba | 72 | #include "audit.h" |
1da177e4 | 73 | |
d7e7528b EP |
74 | /* flags stating the success for a syscall */ |
75 | #define AUDITSC_INVALID 0 | |
76 | #define AUDITSC_SUCCESS 1 | |
77 | #define AUDITSC_FAILURE 2 | |
78 | ||
1da177e4 | 79 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
5195d8e2 EP |
80 | * for saving names from getname(). If we get more names we will allocate |
81 | * a name dynamically and also add those to the list anchored by names_list. */ | |
82 | #define AUDIT_NAMES 5 | |
1da177e4 | 83 | |
de6bbd1d EP |
84 | /* no execve audit message should be longer than this (userspace limits) */ |
85 | #define MAX_EXECVE_AUDIT_LEN 7500 | |
86 | ||
471a5c7c AV |
87 | /* number of audit rules */ |
88 | int audit_n_rules; | |
89 | ||
e54dc243 AG |
90 | /* determines whether we collect data for signals sent */ |
91 | int audit_signals; | |
92 | ||
851f7ff5 EP |
93 | struct audit_cap_data { |
94 | kernel_cap_t permitted; | |
95 | kernel_cap_t inheritable; | |
96 | union { | |
97 | unsigned int fE; /* effective bit of a file capability */ | |
98 | kernel_cap_t effective; /* effective set of a process */ | |
99 | }; | |
100 | }; | |
101 | ||
1da177e4 LT |
102 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
103 | * we don't let putname() free it (instead we free all of the saved | |
104 | * pointers at syscall exit time). | |
105 | * | |
91a27b2a JL |
106 | * Further, in fs/namei.c:path_lookup() we store the inode and device. |
107 | */ | |
1da177e4 | 108 | struct audit_names { |
91a27b2a JL |
109 | struct list_head list; /* audit_context->names_list */ |
110 | struct filename *name; | |
111 | unsigned long ino; | |
112 | dev_t dev; | |
113 | umode_t mode; | |
114 | kuid_t uid; | |
115 | kgid_t gid; | |
116 | dev_t rdev; | |
117 | u32 osid; | |
118 | struct audit_cap_data fcap; | |
119 | unsigned int fcap_ver; | |
120 | int name_len; /* number of name's characters to log */ | |
121 | unsigned char type; /* record type */ | |
122 | bool name_put; /* call __putname() for this name */ | |
5195d8e2 EP |
123 | /* |
124 | * This was an allocated audit_names and not from the array of | |
125 | * names allocated in the task audit context. Thus this name | |
126 | * should be freed on syscall exit | |
127 | */ | |
91a27b2a | 128 | bool should_free; |
1da177e4 LT |
129 | }; |
130 | ||
131 | struct audit_aux_data { | |
132 | struct audit_aux_data *next; | |
133 | int type; | |
134 | }; | |
135 | ||
136 | #define AUDIT_AUX_IPCPERM 0 | |
137 | ||
e54dc243 AG |
138 | /* Number of target pids per aux struct. */ |
139 | #define AUDIT_AUX_PIDS 16 | |
140 | ||
473ae30b AV |
141 | struct audit_aux_data_execve { |
142 | struct audit_aux_data d; | |
143 | int argc; | |
144 | int envc; | |
bdf4c48a | 145 | struct mm_struct *mm; |
473ae30b AV |
146 | }; |
147 | ||
e54dc243 AG |
148 | struct audit_aux_data_pids { |
149 | struct audit_aux_data d; | |
150 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
e1760bd5 | 151 | kuid_t target_auid[AUDIT_AUX_PIDS]; |
cca080d9 | 152 | kuid_t target_uid[AUDIT_AUX_PIDS]; |
4746ec5b | 153 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 154 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 155 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
156 | int pid_count; |
157 | }; | |
158 | ||
3fc689e9 EP |
159 | struct audit_aux_data_bprm_fcaps { |
160 | struct audit_aux_data d; | |
161 | struct audit_cap_data fcap; | |
162 | unsigned int fcap_ver; | |
163 | struct audit_cap_data old_pcap; | |
164 | struct audit_cap_data new_pcap; | |
165 | }; | |
166 | ||
e68b75a0 EP |
167 | struct audit_aux_data_capset { |
168 | struct audit_aux_data d; | |
169 | pid_t pid; | |
170 | struct audit_cap_data cap; | |
171 | }; | |
172 | ||
74c3cbe3 AV |
173 | struct audit_tree_refs { |
174 | struct audit_tree_refs *next; | |
175 | struct audit_chunk *c[31]; | |
176 | }; | |
177 | ||
1da177e4 LT |
178 | /* The per-task audit context. */ |
179 | struct audit_context { | |
d51374ad | 180 | int dummy; /* must be the first element */ |
1da177e4 | 181 | int in_syscall; /* 1 if task is in a syscall */ |
0590b933 | 182 | enum audit_state state, current_state; |
1da177e4 | 183 | unsigned int serial; /* serial number for record */ |
1da177e4 | 184 | int major; /* syscall number */ |
44e51a1b | 185 | struct timespec ctime; /* time of syscall entry */ |
1da177e4 | 186 | unsigned long argv[4]; /* syscall arguments */ |
2fd6f58b | 187 | long return_code;/* syscall return code */ |
0590b933 | 188 | u64 prio; |
44e51a1b | 189 | int return_valid; /* return code is valid */ |
5195d8e2 EP |
190 | /* |
191 | * The names_list is the list of all audit_names collected during this | |
192 | * syscall. The first AUDIT_NAMES entries in the names_list will | |
193 | * actually be from the preallocated_names array for performance | |
194 | * reasons. Except during allocation they should never be referenced | |
195 | * through the preallocated_names array and should only be found/used | |
196 | * by running the names_list. | |
197 | */ | |
198 | struct audit_names preallocated_names[AUDIT_NAMES]; | |
199 | int name_count; /* total records in names_list */ | |
200 | struct list_head names_list; /* anchor for struct audit_names->list */ | |
5adc8a6a | 201 | char * filterkey; /* key for rule that triggered record */ |
44707fdf | 202 | struct path pwd; |
1da177e4 | 203 | struct audit_aux_data *aux; |
e54dc243 | 204 | struct audit_aux_data *aux_pids; |
4f6b434f AV |
205 | struct sockaddr_storage *sockaddr; |
206 | size_t sockaddr_len; | |
1da177e4 | 207 | /* Save things to print about task_struct */ |
f46038ff | 208 | pid_t pid, ppid; |
cca080d9 EB |
209 | kuid_t uid, euid, suid, fsuid; |
210 | kgid_t gid, egid, sgid, fsgid; | |
1da177e4 | 211 | unsigned long personality; |
2fd6f58b | 212 | int arch; |
1da177e4 | 213 | |
a5cb013d | 214 | pid_t target_pid; |
e1760bd5 | 215 | kuid_t target_auid; |
cca080d9 | 216 | kuid_t target_uid; |
4746ec5b | 217 | unsigned int target_sessionid; |
a5cb013d | 218 | u32 target_sid; |
c2a7780e | 219 | char target_comm[TASK_COMM_LEN]; |
a5cb013d | 220 | |
74c3cbe3 | 221 | struct audit_tree_refs *trees, *first_trees; |
916d7576 | 222 | struct list_head killed_trees; |
44e51a1b | 223 | int tree_count; |
74c3cbe3 | 224 | |
f3298dc4 AV |
225 | int type; |
226 | union { | |
227 | struct { | |
228 | int nargs; | |
2950fa9d | 229 | long args[AUDITSC_ARGS]; |
f3298dc4 | 230 | } socketcall; |
a33e6751 | 231 | struct { |
cca080d9 EB |
232 | kuid_t uid; |
233 | kgid_t gid; | |
2570ebbd | 234 | umode_t mode; |
a33e6751 | 235 | u32 osid; |
e816f370 AV |
236 | int has_perm; |
237 | uid_t perm_uid; | |
238 | gid_t perm_gid; | |
2570ebbd | 239 | umode_t perm_mode; |
e816f370 | 240 | unsigned long qbytes; |
a33e6751 | 241 | } ipc; |
7392906e AV |
242 | struct { |
243 | mqd_t mqdes; | |
244 | struct mq_attr mqstat; | |
245 | } mq_getsetattr; | |
20114f71 AV |
246 | struct { |
247 | mqd_t mqdes; | |
248 | int sigev_signo; | |
249 | } mq_notify; | |
c32c8af4 AV |
250 | struct { |
251 | mqd_t mqdes; | |
252 | size_t msg_len; | |
253 | unsigned int msg_prio; | |
254 | struct timespec abs_timeout; | |
255 | } mq_sendrecv; | |
564f6993 AV |
256 | struct { |
257 | int oflag; | |
df0a4283 | 258 | umode_t mode; |
564f6993 AV |
259 | struct mq_attr attr; |
260 | } mq_open; | |
57f71a0a AV |
261 | struct { |
262 | pid_t pid; | |
263 | struct audit_cap_data cap; | |
264 | } capset; | |
120a795d AV |
265 | struct { |
266 | int fd; | |
267 | int flags; | |
268 | } mmap; | |
f3298dc4 | 269 | }; |
157cf649 | 270 | int fds[2]; |
f3298dc4 | 271 | |
1da177e4 LT |
272 | #if AUDIT_DEBUG |
273 | int put_count; | |
274 | int ino_count; | |
275 | #endif | |
276 | }; | |
277 | ||
55669bfa AV |
278 | static inline int open_arg(int flags, int mask) |
279 | { | |
280 | int n = ACC_MODE(flags); | |
281 | if (flags & (O_TRUNC | O_CREAT)) | |
282 | n |= AUDIT_PERM_WRITE; | |
283 | return n & mask; | |
284 | } | |
285 | ||
286 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
287 | { | |
c4bacefb | 288 | unsigned n; |
1a61c88d | 289 | if (unlikely(!ctx)) |
290 | return 0; | |
c4bacefb | 291 | n = ctx->major; |
dbda4c0b | 292 | |
55669bfa AV |
293 | switch (audit_classify_syscall(ctx->arch, n)) { |
294 | case 0: /* native */ | |
295 | if ((mask & AUDIT_PERM_WRITE) && | |
296 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
297 | return 1; | |
298 | if ((mask & AUDIT_PERM_READ) && | |
299 | audit_match_class(AUDIT_CLASS_READ, n)) | |
300 | return 1; | |
301 | if ((mask & AUDIT_PERM_ATTR) && | |
302 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
303 | return 1; | |
304 | return 0; | |
305 | case 1: /* 32bit on biarch */ | |
306 | if ((mask & AUDIT_PERM_WRITE) && | |
307 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
308 | return 1; | |
309 | if ((mask & AUDIT_PERM_READ) && | |
310 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
311 | return 1; | |
312 | if ((mask & AUDIT_PERM_ATTR) && | |
313 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
314 | return 1; | |
315 | return 0; | |
316 | case 2: /* open */ | |
317 | return mask & ACC_MODE(ctx->argv[1]); | |
318 | case 3: /* openat */ | |
319 | return mask & ACC_MODE(ctx->argv[2]); | |
320 | case 4: /* socketcall */ | |
321 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
322 | case 5: /* execve */ | |
323 | return mask & AUDIT_PERM_EXEC; | |
324 | default: | |
325 | return 0; | |
326 | } | |
327 | } | |
328 | ||
5ef30ee5 | 329 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 330 | { |
5195d8e2 | 331 | struct audit_names *n; |
5ef30ee5 | 332 | umode_t mode = (umode_t)val; |
1a61c88d | 333 | |
334 | if (unlikely(!ctx)) | |
335 | return 0; | |
336 | ||
5195d8e2 EP |
337 | list_for_each_entry(n, &ctx->names_list, list) { |
338 | if ((n->ino != -1) && | |
339 | ((n->mode & S_IFMT) == mode)) | |
5ef30ee5 EP |
340 | return 1; |
341 | } | |
5195d8e2 | 342 | |
5ef30ee5 | 343 | return 0; |
8b67dca9 AV |
344 | } |
345 | ||
74c3cbe3 AV |
346 | /* |
347 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
348 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
349 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
350 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
351 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
352 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
353 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
354 | */ | |
355 | ||
356 | #ifdef CONFIG_AUDIT_TREE | |
679173b7 EP |
357 | static void audit_set_auditable(struct audit_context *ctx) |
358 | { | |
359 | if (!ctx->prio) { | |
360 | ctx->prio = 1; | |
361 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
362 | } | |
363 | } | |
364 | ||
74c3cbe3 AV |
365 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
366 | { | |
367 | struct audit_tree_refs *p = ctx->trees; | |
368 | int left = ctx->tree_count; | |
369 | if (likely(left)) { | |
370 | p->c[--left] = chunk; | |
371 | ctx->tree_count = left; | |
372 | return 1; | |
373 | } | |
374 | if (!p) | |
375 | return 0; | |
376 | p = p->next; | |
377 | if (p) { | |
378 | p->c[30] = chunk; | |
379 | ctx->trees = p; | |
380 | ctx->tree_count = 30; | |
381 | return 1; | |
382 | } | |
383 | return 0; | |
384 | } | |
385 | ||
386 | static int grow_tree_refs(struct audit_context *ctx) | |
387 | { | |
388 | struct audit_tree_refs *p = ctx->trees; | |
389 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
390 | if (!ctx->trees) { | |
391 | ctx->trees = p; | |
392 | return 0; | |
393 | } | |
394 | if (p) | |
395 | p->next = ctx->trees; | |
396 | else | |
397 | ctx->first_trees = ctx->trees; | |
398 | ctx->tree_count = 31; | |
399 | return 1; | |
400 | } | |
401 | #endif | |
402 | ||
403 | static void unroll_tree_refs(struct audit_context *ctx, | |
404 | struct audit_tree_refs *p, int count) | |
405 | { | |
406 | #ifdef CONFIG_AUDIT_TREE | |
407 | struct audit_tree_refs *q; | |
408 | int n; | |
409 | if (!p) { | |
410 | /* we started with empty chain */ | |
411 | p = ctx->first_trees; | |
412 | count = 31; | |
413 | /* if the very first allocation has failed, nothing to do */ | |
414 | if (!p) | |
415 | return; | |
416 | } | |
417 | n = count; | |
418 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
419 | while (n--) { | |
420 | audit_put_chunk(q->c[n]); | |
421 | q->c[n] = NULL; | |
422 | } | |
423 | } | |
424 | while (n-- > ctx->tree_count) { | |
425 | audit_put_chunk(q->c[n]); | |
426 | q->c[n] = NULL; | |
427 | } | |
428 | ctx->trees = p; | |
429 | ctx->tree_count = count; | |
430 | #endif | |
431 | } | |
432 | ||
433 | static void free_tree_refs(struct audit_context *ctx) | |
434 | { | |
435 | struct audit_tree_refs *p, *q; | |
436 | for (p = ctx->first_trees; p; p = q) { | |
437 | q = p->next; | |
438 | kfree(p); | |
439 | } | |
440 | } | |
441 | ||
442 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
443 | { | |
444 | #ifdef CONFIG_AUDIT_TREE | |
445 | struct audit_tree_refs *p; | |
446 | int n; | |
447 | if (!tree) | |
448 | return 0; | |
449 | /* full ones */ | |
450 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
451 | for (n = 0; n < 31; n++) | |
452 | if (audit_tree_match(p->c[n], tree)) | |
453 | return 1; | |
454 | } | |
455 | /* partial */ | |
456 | if (p) { | |
457 | for (n = ctx->tree_count; n < 31; n++) | |
458 | if (audit_tree_match(p->c[n], tree)) | |
459 | return 1; | |
460 | } | |
461 | #endif | |
462 | return 0; | |
463 | } | |
464 | ||
ca57ec0f EB |
465 | static int audit_compare_uid(kuid_t uid, |
466 | struct audit_names *name, | |
467 | struct audit_field *f, | |
468 | struct audit_context *ctx) | |
b34b0393 EP |
469 | { |
470 | struct audit_names *n; | |
b34b0393 | 471 | int rc; |
ca57ec0f | 472 | |
b34b0393 | 473 | if (name) { |
ca57ec0f | 474 | rc = audit_uid_comparator(uid, f->op, name->uid); |
b34b0393 EP |
475 | if (rc) |
476 | return rc; | |
477 | } | |
ca57ec0f | 478 | |
b34b0393 EP |
479 | if (ctx) { |
480 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f EB |
481 | rc = audit_uid_comparator(uid, f->op, n->uid); |
482 | if (rc) | |
483 | return rc; | |
484 | } | |
485 | } | |
486 | return 0; | |
487 | } | |
b34b0393 | 488 | |
ca57ec0f EB |
489 | static int audit_compare_gid(kgid_t gid, |
490 | struct audit_names *name, | |
491 | struct audit_field *f, | |
492 | struct audit_context *ctx) | |
493 | { | |
494 | struct audit_names *n; | |
495 | int rc; | |
496 | ||
497 | if (name) { | |
498 | rc = audit_gid_comparator(gid, f->op, name->gid); | |
499 | if (rc) | |
500 | return rc; | |
501 | } | |
502 | ||
503 | if (ctx) { | |
504 | list_for_each_entry(n, &ctx->names_list, list) { | |
505 | rc = audit_gid_comparator(gid, f->op, n->gid); | |
b34b0393 EP |
506 | if (rc) |
507 | return rc; | |
508 | } | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | ||
02d86a56 EP |
513 | static int audit_field_compare(struct task_struct *tsk, |
514 | const struct cred *cred, | |
515 | struct audit_field *f, | |
516 | struct audit_context *ctx, | |
517 | struct audit_names *name) | |
518 | { | |
02d86a56 | 519 | switch (f->val) { |
4a6633ed | 520 | /* process to file object comparisons */ |
02d86a56 | 521 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
ca57ec0f | 522 | return audit_compare_uid(cred->uid, name, f, ctx); |
c9fe685f | 523 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
ca57ec0f | 524 | return audit_compare_gid(cred->gid, name, f, ctx); |
4a6633ed | 525 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
ca57ec0f | 526 | return audit_compare_uid(cred->euid, name, f, ctx); |
4a6633ed | 527 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: |
ca57ec0f | 528 | return audit_compare_gid(cred->egid, name, f, ctx); |
4a6633ed | 529 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: |
ca57ec0f | 530 | return audit_compare_uid(tsk->loginuid, name, f, ctx); |
4a6633ed | 531 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: |
ca57ec0f | 532 | return audit_compare_uid(cred->suid, name, f, ctx); |
4a6633ed | 533 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: |
ca57ec0f | 534 | return audit_compare_gid(cred->sgid, name, f, ctx); |
4a6633ed | 535 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: |
ca57ec0f | 536 | return audit_compare_uid(cred->fsuid, name, f, ctx); |
4a6633ed | 537 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: |
ca57ec0f | 538 | return audit_compare_gid(cred->fsgid, name, f, ctx); |
10d68360 PM |
539 | /* uid comparisons */ |
540 | case AUDIT_COMPARE_UID_TO_AUID: | |
ca57ec0f | 541 | return audit_uid_comparator(cred->uid, f->op, tsk->loginuid); |
10d68360 | 542 | case AUDIT_COMPARE_UID_TO_EUID: |
ca57ec0f | 543 | return audit_uid_comparator(cred->uid, f->op, cred->euid); |
10d68360 | 544 | case AUDIT_COMPARE_UID_TO_SUID: |
ca57ec0f | 545 | return audit_uid_comparator(cred->uid, f->op, cred->suid); |
10d68360 | 546 | case AUDIT_COMPARE_UID_TO_FSUID: |
ca57ec0f | 547 | return audit_uid_comparator(cred->uid, f->op, cred->fsuid); |
10d68360 PM |
548 | /* auid comparisons */ |
549 | case AUDIT_COMPARE_AUID_TO_EUID: | |
ca57ec0f | 550 | return audit_uid_comparator(tsk->loginuid, f->op, cred->euid); |
10d68360 | 551 | case AUDIT_COMPARE_AUID_TO_SUID: |
ca57ec0f | 552 | return audit_uid_comparator(tsk->loginuid, f->op, cred->suid); |
10d68360 | 553 | case AUDIT_COMPARE_AUID_TO_FSUID: |
ca57ec0f | 554 | return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid); |
10d68360 PM |
555 | /* euid comparisons */ |
556 | case AUDIT_COMPARE_EUID_TO_SUID: | |
ca57ec0f | 557 | return audit_uid_comparator(cred->euid, f->op, cred->suid); |
10d68360 | 558 | case AUDIT_COMPARE_EUID_TO_FSUID: |
ca57ec0f | 559 | return audit_uid_comparator(cred->euid, f->op, cred->fsuid); |
10d68360 PM |
560 | /* suid comparisons */ |
561 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
ca57ec0f | 562 | return audit_uid_comparator(cred->suid, f->op, cred->fsuid); |
10d68360 PM |
563 | /* gid comparisons */ |
564 | case AUDIT_COMPARE_GID_TO_EGID: | |
ca57ec0f | 565 | return audit_gid_comparator(cred->gid, f->op, cred->egid); |
10d68360 | 566 | case AUDIT_COMPARE_GID_TO_SGID: |
ca57ec0f | 567 | return audit_gid_comparator(cred->gid, f->op, cred->sgid); |
10d68360 | 568 | case AUDIT_COMPARE_GID_TO_FSGID: |
ca57ec0f | 569 | return audit_gid_comparator(cred->gid, f->op, cred->fsgid); |
10d68360 PM |
570 | /* egid comparisons */ |
571 | case AUDIT_COMPARE_EGID_TO_SGID: | |
ca57ec0f | 572 | return audit_gid_comparator(cred->egid, f->op, cred->sgid); |
10d68360 | 573 | case AUDIT_COMPARE_EGID_TO_FSGID: |
ca57ec0f | 574 | return audit_gid_comparator(cred->egid, f->op, cred->fsgid); |
10d68360 PM |
575 | /* sgid comparison */ |
576 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
ca57ec0f | 577 | return audit_gid_comparator(cred->sgid, f->op, cred->fsgid); |
02d86a56 EP |
578 | default: |
579 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
580 | return 0; | |
581 | } | |
582 | return 0; | |
583 | } | |
584 | ||
f368c07d | 585 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 586 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
587 | * otherwise. |
588 | * | |
589 | * If task_creation is true, this is an explicit indication that we are | |
590 | * filtering a task rule at task creation time. This and tsk == current are | |
591 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
592 | */ | |
1da177e4 | 593 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 594 | struct audit_krule *rule, |
1da177e4 | 595 | struct audit_context *ctx, |
f368c07d | 596 | struct audit_names *name, |
f5629883 TJ |
597 | enum audit_state *state, |
598 | bool task_creation) | |
1da177e4 | 599 | { |
f5629883 | 600 | const struct cred *cred; |
5195d8e2 | 601 | int i, need_sid = 1; |
3dc7e315 DG |
602 | u32 sid; |
603 | ||
f5629883 TJ |
604 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
605 | ||
1da177e4 | 606 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 607 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 608 | struct audit_names *n; |
1da177e4 LT |
609 | int result = 0; |
610 | ||
93315ed6 | 611 | switch (f->type) { |
1da177e4 | 612 | case AUDIT_PID: |
93315ed6 | 613 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 614 | break; |
3c66251e | 615 | case AUDIT_PPID: |
419c58f1 AV |
616 | if (ctx) { |
617 | if (!ctx->ppid) | |
618 | ctx->ppid = sys_getppid(); | |
3c66251e | 619 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 620 | } |
3c66251e | 621 | break; |
1da177e4 | 622 | case AUDIT_UID: |
ca57ec0f | 623 | result = audit_uid_comparator(cred->uid, f->op, f->uid); |
1da177e4 LT |
624 | break; |
625 | case AUDIT_EUID: | |
ca57ec0f | 626 | result = audit_uid_comparator(cred->euid, f->op, f->uid); |
1da177e4 LT |
627 | break; |
628 | case AUDIT_SUID: | |
ca57ec0f | 629 | result = audit_uid_comparator(cred->suid, f->op, f->uid); |
1da177e4 LT |
630 | break; |
631 | case AUDIT_FSUID: | |
ca57ec0f | 632 | result = audit_uid_comparator(cred->fsuid, f->op, f->uid); |
1da177e4 LT |
633 | break; |
634 | case AUDIT_GID: | |
ca57ec0f | 635 | result = audit_gid_comparator(cred->gid, f->op, f->gid); |
37eebe39 MI |
636 | if (f->op == Audit_equal) { |
637 | if (!result) | |
638 | result = in_group_p(f->gid); | |
639 | } else if (f->op == Audit_not_equal) { | |
640 | if (result) | |
641 | result = !in_group_p(f->gid); | |
642 | } | |
1da177e4 LT |
643 | break; |
644 | case AUDIT_EGID: | |
ca57ec0f | 645 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
37eebe39 MI |
646 | if (f->op == Audit_equal) { |
647 | if (!result) | |
648 | result = in_egroup_p(f->gid); | |
649 | } else if (f->op == Audit_not_equal) { | |
650 | if (result) | |
651 | result = !in_egroup_p(f->gid); | |
652 | } | |
1da177e4 LT |
653 | break; |
654 | case AUDIT_SGID: | |
ca57ec0f | 655 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
656 | break; |
657 | case AUDIT_FSGID: | |
ca57ec0f | 658 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 LT |
659 | break; |
660 | case AUDIT_PERS: | |
93315ed6 | 661 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 662 | break; |
2fd6f58b | 663 | case AUDIT_ARCH: |
9f8dbe9c | 664 | if (ctx) |
93315ed6 | 665 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 666 | break; |
1da177e4 LT |
667 | |
668 | case AUDIT_EXIT: | |
669 | if (ctx && ctx->return_valid) | |
93315ed6 | 670 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
671 | break; |
672 | case AUDIT_SUCCESS: | |
b01f2cc1 | 673 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
674 | if (f->val) |
675 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 676 | else |
93315ed6 | 677 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 678 | } |
1da177e4 LT |
679 | break; |
680 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
681 | if (name) { |
682 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
683 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
684 | ++result; | |
685 | } else if (ctx) { | |
5195d8e2 | 686 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
687 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
688 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
689 | ++result; |
690 | break; | |
691 | } | |
692 | } | |
693 | } | |
694 | break; | |
695 | case AUDIT_DEVMINOR: | |
16c174bd EP |
696 | if (name) { |
697 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
698 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
699 | ++result; | |
700 | } else if (ctx) { | |
5195d8e2 | 701 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
702 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
703 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
704 | ++result; |
705 | break; | |
706 | } | |
707 | } | |
708 | } | |
709 | break; | |
710 | case AUDIT_INODE: | |
f368c07d | 711 | if (name) |
9c937dcc | 712 | result = (name->ino == f->val); |
f368c07d | 713 | else if (ctx) { |
5195d8e2 EP |
714 | list_for_each_entry(n, &ctx->names_list, list) { |
715 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
716 | ++result; |
717 | break; | |
718 | } | |
719 | } | |
720 | } | |
721 | break; | |
efaffd6e EP |
722 | case AUDIT_OBJ_UID: |
723 | if (name) { | |
ca57ec0f | 724 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
725 | } else if (ctx) { |
726 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 727 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
728 | ++result; |
729 | break; | |
730 | } | |
731 | } | |
732 | } | |
733 | break; | |
54d3218b EP |
734 | case AUDIT_OBJ_GID: |
735 | if (name) { | |
ca57ec0f | 736 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
737 | } else if (ctx) { |
738 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 739 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
740 | ++result; |
741 | break; | |
742 | } | |
743 | } | |
744 | } | |
745 | break; | |
f368c07d | 746 | case AUDIT_WATCH: |
ae7b8f41 EP |
747 | if (name) |
748 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 749 | break; |
74c3cbe3 AV |
750 | case AUDIT_DIR: |
751 | if (ctx) | |
752 | result = match_tree_refs(ctx, rule->tree); | |
753 | break; | |
1da177e4 LT |
754 | case AUDIT_LOGINUID: |
755 | result = 0; | |
756 | if (ctx) | |
ca57ec0f | 757 | result = audit_uid_comparator(tsk->loginuid, f->op, f->uid); |
1da177e4 | 758 | break; |
3a6b9f85 DG |
759 | case AUDIT_SUBJ_USER: |
760 | case AUDIT_SUBJ_ROLE: | |
761 | case AUDIT_SUBJ_TYPE: | |
762 | case AUDIT_SUBJ_SEN: | |
763 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
764 | /* NOTE: this may return negative values indicating |
765 | a temporary error. We simply treat this as a | |
766 | match for now to avoid losing information that | |
767 | may be wanted. An error message will also be | |
768 | logged upon error */ | |
04305e4a | 769 | if (f->lsm_rule) { |
2ad312d2 | 770 | if (need_sid) { |
2a862b32 | 771 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
772 | need_sid = 0; |
773 | } | |
d7a96f3a | 774 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 775 | f->op, |
04305e4a | 776 | f->lsm_rule, |
3dc7e315 | 777 | ctx); |
2ad312d2 | 778 | } |
3dc7e315 | 779 | break; |
6e5a2d1d DG |
780 | case AUDIT_OBJ_USER: |
781 | case AUDIT_OBJ_ROLE: | |
782 | case AUDIT_OBJ_TYPE: | |
783 | case AUDIT_OBJ_LEV_LOW: | |
784 | case AUDIT_OBJ_LEV_HIGH: | |
785 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
786 | also applies here */ | |
04305e4a | 787 | if (f->lsm_rule) { |
6e5a2d1d DG |
788 | /* Find files that match */ |
789 | if (name) { | |
d7a96f3a | 790 | result = security_audit_rule_match( |
6e5a2d1d | 791 | name->osid, f->type, f->op, |
04305e4a | 792 | f->lsm_rule, ctx); |
6e5a2d1d | 793 | } else if (ctx) { |
5195d8e2 EP |
794 | list_for_each_entry(n, &ctx->names_list, list) { |
795 | if (security_audit_rule_match(n->osid, f->type, | |
796 | f->op, f->lsm_rule, | |
797 | ctx)) { | |
6e5a2d1d DG |
798 | ++result; |
799 | break; | |
800 | } | |
801 | } | |
802 | } | |
803 | /* Find ipc objects that match */ | |
a33e6751 AV |
804 | if (!ctx || ctx->type != AUDIT_IPC) |
805 | break; | |
806 | if (security_audit_rule_match(ctx->ipc.osid, | |
807 | f->type, f->op, | |
808 | f->lsm_rule, ctx)) | |
809 | ++result; | |
6e5a2d1d DG |
810 | } |
811 | break; | |
1da177e4 LT |
812 | case AUDIT_ARG0: |
813 | case AUDIT_ARG1: | |
814 | case AUDIT_ARG2: | |
815 | case AUDIT_ARG3: | |
816 | if (ctx) | |
93315ed6 | 817 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 818 | break; |
5adc8a6a AG |
819 | case AUDIT_FILTERKEY: |
820 | /* ignore this field for filtering */ | |
821 | result = 1; | |
822 | break; | |
55669bfa AV |
823 | case AUDIT_PERM: |
824 | result = audit_match_perm(ctx, f->val); | |
825 | break; | |
8b67dca9 AV |
826 | case AUDIT_FILETYPE: |
827 | result = audit_match_filetype(ctx, f->val); | |
828 | break; | |
02d86a56 EP |
829 | case AUDIT_FIELD_COMPARE: |
830 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
831 | break; | |
1da177e4 | 832 | } |
f5629883 | 833 | if (!result) |
1da177e4 LT |
834 | return 0; |
835 | } | |
0590b933 AV |
836 | |
837 | if (ctx) { | |
838 | if (rule->prio <= ctx->prio) | |
839 | return 0; | |
840 | if (rule->filterkey) { | |
841 | kfree(ctx->filterkey); | |
842 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
843 | } | |
844 | ctx->prio = rule->prio; | |
845 | } | |
1da177e4 LT |
846 | switch (rule->action) { |
847 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
848 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
849 | } | |
850 | return 1; | |
851 | } | |
852 | ||
853 | /* At process creation time, we can determine if system-call auditing is | |
854 | * completely disabled for this task. Since we only have the task | |
855 | * structure at this point, we can only check uid and gid. | |
856 | */ | |
e048e02c | 857 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
858 | { |
859 | struct audit_entry *e; | |
860 | enum audit_state state; | |
861 | ||
862 | rcu_read_lock(); | |
0f45aa18 | 863 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
864 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
865 | &state, true)) { | |
e048e02c AV |
866 | if (state == AUDIT_RECORD_CONTEXT) |
867 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
868 | rcu_read_unlock(); |
869 | return state; | |
870 | } | |
871 | } | |
872 | rcu_read_unlock(); | |
873 | return AUDIT_BUILD_CONTEXT; | |
874 | } | |
875 | ||
876 | /* At syscall entry and exit time, this filter is called if the | |
877 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 878 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 879 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
880 | */ |
881 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
882 | struct audit_context *ctx, | |
883 | struct list_head *list) | |
884 | { | |
885 | struct audit_entry *e; | |
c3896495 | 886 | enum audit_state state; |
1da177e4 | 887 | |
351bb722 | 888 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
889 | return AUDIT_DISABLED; |
890 | ||
1da177e4 | 891 | rcu_read_lock(); |
c3896495 | 892 | if (!list_empty(list)) { |
b63862f4 DK |
893 | int word = AUDIT_WORD(ctx->major); |
894 | int bit = AUDIT_BIT(ctx->major); | |
895 | ||
896 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
897 | if ((e->rule.mask[word] & bit) == bit && |
898 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
f5629883 | 899 | &state, false)) { |
f368c07d | 900 | rcu_read_unlock(); |
0590b933 | 901 | ctx->current_state = state; |
f368c07d AG |
902 | return state; |
903 | } | |
904 | } | |
905 | } | |
906 | rcu_read_unlock(); | |
907 | return AUDIT_BUILD_CONTEXT; | |
908 | } | |
909 | ||
5195d8e2 EP |
910 | /* |
911 | * Given an audit_name check the inode hash table to see if they match. | |
912 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
913 | */ | |
914 | static int audit_filter_inode_name(struct task_struct *tsk, | |
915 | struct audit_names *n, | |
916 | struct audit_context *ctx) { | |
917 | int word, bit; | |
918 | int h = audit_hash_ino((u32)n->ino); | |
919 | struct list_head *list = &audit_inode_hash[h]; | |
920 | struct audit_entry *e; | |
921 | enum audit_state state; | |
922 | ||
923 | word = AUDIT_WORD(ctx->major); | |
924 | bit = AUDIT_BIT(ctx->major); | |
925 | ||
926 | if (list_empty(list)) | |
927 | return 0; | |
928 | ||
929 | list_for_each_entry_rcu(e, list, list) { | |
930 | if ((e->rule.mask[word] & bit) == bit && | |
931 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { | |
932 | ctx->current_state = state; | |
933 | return 1; | |
934 | } | |
935 | } | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
940 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 941 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 942 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
943 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
944 | */ | |
0590b933 | 945 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 946 | { |
5195d8e2 | 947 | struct audit_names *n; |
f368c07d AG |
948 | |
949 | if (audit_pid && tsk->tgid == audit_pid) | |
0590b933 | 950 | return; |
f368c07d AG |
951 | |
952 | rcu_read_lock(); | |
f368c07d | 953 | |
5195d8e2 EP |
954 | list_for_each_entry(n, &ctx->names_list, list) { |
955 | if (audit_filter_inode_name(tsk, n, ctx)) | |
956 | break; | |
0f45aa18 DW |
957 | } |
958 | rcu_read_unlock(); | |
0f45aa18 DW |
959 | } |
960 | ||
1da177e4 LT |
961 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
962 | int return_valid, | |
6d208da8 | 963 | long return_code) |
1da177e4 LT |
964 | { |
965 | struct audit_context *context = tsk->audit_context; | |
966 | ||
56179a6e | 967 | if (!context) |
1da177e4 LT |
968 | return NULL; |
969 | context->return_valid = return_valid; | |
f701b75e EP |
970 | |
971 | /* | |
972 | * we need to fix up the return code in the audit logs if the actual | |
973 | * return codes are later going to be fixed up by the arch specific | |
974 | * signal handlers | |
975 | * | |
976 | * This is actually a test for: | |
977 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
978 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
979 | * | |
980 | * but is faster than a bunch of || | |
981 | */ | |
982 | if (unlikely(return_code <= -ERESTARTSYS) && | |
983 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
984 | (return_code != -ENOIOCTLCMD)) | |
985 | context->return_code = -EINTR; | |
986 | else | |
987 | context->return_code = return_code; | |
1da177e4 | 988 | |
0590b933 AV |
989 | if (context->in_syscall && !context->dummy) { |
990 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
991 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
992 | } |
993 | ||
1da177e4 LT |
994 | tsk->audit_context = NULL; |
995 | return context; | |
996 | } | |
997 | ||
998 | static inline void audit_free_names(struct audit_context *context) | |
999 | { | |
5195d8e2 | 1000 | struct audit_names *n, *next; |
1da177e4 LT |
1001 | |
1002 | #if AUDIT_DEBUG == 2 | |
0590b933 | 1003 | if (context->put_count + context->ino_count != context->name_count) { |
34c474de EP |
1004 | int i = 0; |
1005 | ||
73241ccc | 1006 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
1007 | " name_count=%d put_count=%d" |
1008 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 1009 | __FILE__, __LINE__, |
1da177e4 LT |
1010 | context->serial, context->major, context->in_syscall, |
1011 | context->name_count, context->put_count, | |
1012 | context->ino_count); | |
5195d8e2 | 1013 | list_for_each_entry(n, &context->names_list, list) { |
34c474de | 1014 | printk(KERN_ERR "names[%d] = %p = %s\n", i++, |
91a27b2a | 1015 | n->name, n->name->name ?: "(null)"); |
8c8570fb | 1016 | } |
1da177e4 LT |
1017 | dump_stack(); |
1018 | return; | |
1019 | } | |
1020 | #endif | |
1021 | #if AUDIT_DEBUG | |
1022 | context->put_count = 0; | |
1023 | context->ino_count = 0; | |
1024 | #endif | |
1025 | ||
5195d8e2 EP |
1026 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
1027 | list_del(&n->list); | |
1028 | if (n->name && n->name_put) | |
65ada7bc | 1029 | final_putname(n->name); |
5195d8e2 EP |
1030 | if (n->should_free) |
1031 | kfree(n); | |
8c8570fb | 1032 | } |
1da177e4 | 1033 | context->name_count = 0; |
44707fdf JB |
1034 | path_put(&context->pwd); |
1035 | context->pwd.dentry = NULL; | |
1036 | context->pwd.mnt = NULL; | |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | static inline void audit_free_aux(struct audit_context *context) | |
1040 | { | |
1041 | struct audit_aux_data *aux; | |
1042 | ||
1043 | while ((aux = context->aux)) { | |
1044 | context->aux = aux->next; | |
1045 | kfree(aux); | |
1046 | } | |
e54dc243 AG |
1047 | while ((aux = context->aux_pids)) { |
1048 | context->aux_pids = aux->next; | |
1049 | kfree(aux); | |
1050 | } | |
1da177e4 LT |
1051 | } |
1052 | ||
1da177e4 LT |
1053 | static inline struct audit_context *audit_alloc_context(enum audit_state state) |
1054 | { | |
1055 | struct audit_context *context; | |
1056 | ||
17c6ee70 RM |
1057 | context = kzalloc(sizeof(*context), GFP_KERNEL); |
1058 | if (!context) | |
1da177e4 | 1059 | return NULL; |
e2c5adc8 AM |
1060 | context->state = state; |
1061 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; | |
916d7576 | 1062 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 1063 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
1064 | return context; |
1065 | } | |
1066 | ||
b0dd25a8 RD |
1067 | /** |
1068 | * audit_alloc - allocate an audit context block for a task | |
1069 | * @tsk: task | |
1070 | * | |
1071 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
1072 | * if necessary. Doing so turns on system call auditing for the |
1073 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
1074 | * needed. |
1075 | */ | |
1da177e4 LT |
1076 | int audit_alloc(struct task_struct *tsk) |
1077 | { | |
1078 | struct audit_context *context; | |
1079 | enum audit_state state; | |
e048e02c | 1080 | char *key = NULL; |
1da177e4 | 1081 | |
b593d384 | 1082 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
1083 | return 0; /* Return if not auditing. */ |
1084 | ||
e048e02c | 1085 | state = audit_filter_task(tsk, &key); |
56179a6e | 1086 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1087 | return 0; |
1088 | ||
1089 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 1090 | kfree(key); |
1da177e4 LT |
1091 | audit_log_lost("out of memory in audit_alloc"); |
1092 | return -ENOMEM; | |
1093 | } | |
e048e02c | 1094 | context->filterkey = key; |
1da177e4 | 1095 | |
1da177e4 LT |
1096 | tsk->audit_context = context; |
1097 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | static inline void audit_free_context(struct audit_context *context) | |
1102 | { | |
c62d773a AV |
1103 | audit_free_names(context); |
1104 | unroll_tree_refs(context, NULL, 0); | |
1105 | free_tree_refs(context); | |
1106 | audit_free_aux(context); | |
1107 | kfree(context->filterkey); | |
1108 | kfree(context->sockaddr); | |
1109 | kfree(context); | |
1da177e4 LT |
1110 | } |
1111 | ||
b122c376 | 1112 | int audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
1113 | { |
1114 | char *ctx = NULL; | |
c4823bce AV |
1115 | unsigned len; |
1116 | int error; | |
1117 | u32 sid; | |
1118 | ||
2a862b32 | 1119 | security_task_getsecid(current, &sid); |
c4823bce | 1120 | if (!sid) |
b122c376 | 1121 | return 0; |
8c8570fb | 1122 | |
2a862b32 | 1123 | error = security_secid_to_secctx(sid, &ctx, &len); |
c4823bce AV |
1124 | if (error) { |
1125 | if (error != -EINVAL) | |
8c8570fb | 1126 | goto error_path; |
b122c376 | 1127 | return 0; |
8c8570fb DK |
1128 | } |
1129 | ||
8c8570fb | 1130 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 | 1131 | security_release_secctx(ctx, len); |
b122c376 | 1132 | return 0; |
8c8570fb DK |
1133 | |
1134 | error_path: | |
7306a0b9 | 1135 | audit_panic("error in audit_log_task_context"); |
b122c376 | 1136 | return error; |
8c8570fb DK |
1137 | } |
1138 | ||
161a09e7 JL |
1139 | EXPORT_SYMBOL(audit_log_task_context); |
1140 | ||
e23eb920 | 1141 | void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 1142 | { |
e23eb920 | 1143 | const struct cred *cred; |
45d9bb0e AV |
1144 | char name[sizeof(tsk->comm)]; |
1145 | struct mm_struct *mm = tsk->mm; | |
e23eb920 PM |
1146 | char *tty; |
1147 | ||
1148 | if (!ab) | |
1149 | return; | |
219f0817 | 1150 | |
e495149b | 1151 | /* tsk == current */ |
e23eb920 PM |
1152 | cred = current_cred(); |
1153 | ||
1154 | spin_lock_irq(&tsk->sighand->siglock); | |
8ae763cd | 1155 | if (tsk->signal && tsk->signal->tty) |
e23eb920 PM |
1156 | tty = tsk->signal->tty->name; |
1157 | else | |
1158 | tty = "(none)"; | |
1159 | spin_unlock_irq(&tsk->sighand->siglock); | |
1160 | ||
1161 | ||
1162 | audit_log_format(ab, | |
1163 | " ppid=%ld pid=%d auid=%u uid=%u gid=%u" | |
1164 | " euid=%u suid=%u fsuid=%u" | |
1165 | " egid=%u sgid=%u fsgid=%u ses=%u tty=%s", | |
1166 | sys_getppid(), | |
1167 | tsk->pid, | |
88265322 LT |
1168 | from_kuid(&init_user_ns, tsk->loginuid), |
1169 | from_kuid(&init_user_ns, cred->uid), | |
1170 | from_kgid(&init_user_ns, cred->gid), | |
1171 | from_kuid(&init_user_ns, cred->euid), | |
1172 | from_kuid(&init_user_ns, cred->suid), | |
1173 | from_kuid(&init_user_ns, cred->fsuid), | |
1174 | from_kgid(&init_user_ns, cred->egid), | |
1175 | from_kgid(&init_user_ns, cred->sgid), | |
1176 | from_kgid(&init_user_ns, cred->fsgid), | |
e23eb920 | 1177 | tsk->sessionid, tty); |
e495149b | 1178 | |
45d9bb0e | 1179 | get_task_comm(name, tsk); |
99e45eea DW |
1180 | audit_log_format(ab, " comm="); |
1181 | audit_log_untrustedstring(ab, name); | |
219f0817 | 1182 | |
e495149b AV |
1183 | if (mm) { |
1184 | down_read(&mm->mmap_sem); | |
2dd8ad81 KK |
1185 | if (mm->exe_file) |
1186 | audit_log_d_path(ab, " exe=", &mm->exe_file->f_path); | |
e495149b | 1187 | up_read(&mm->mmap_sem); |
219f0817 | 1188 | } |
e495149b | 1189 | audit_log_task_context(ab); |
219f0817 SS |
1190 | } |
1191 | ||
e23eb920 PM |
1192 | EXPORT_SYMBOL(audit_log_task_info); |
1193 | ||
e54dc243 | 1194 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9 | 1195 | kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b | 1196 | u32 sid, char *comm) |
e54dc243 AG |
1197 | { |
1198 | struct audit_buffer *ab; | |
2a862b32 | 1199 | char *ctx = NULL; |
e54dc243 AG |
1200 | u32 len; |
1201 | int rc = 0; | |
1202 | ||
1203 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
1204 | if (!ab) | |
6246ccab | 1205 | return rc; |
e54dc243 | 1206 | |
e1760bd5 EB |
1207 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
1208 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 1209 | from_kuid(&init_user_ns, uid), sessionid); |
ad395abe EP |
1210 | if (sid) { |
1211 | if (security_secid_to_secctx(sid, &ctx, &len)) { | |
1212 | audit_log_format(ab, " obj=(none)"); | |
1213 | rc = 1; | |
1214 | } else { | |
1215 | audit_log_format(ab, " obj=%s", ctx); | |
1216 | security_release_secctx(ctx, len); | |
1217 | } | |
2a862b32 | 1218 | } |
c2a7780e EP |
1219 | audit_log_format(ab, " ocomm="); |
1220 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1221 | audit_log_end(ab); |
e54dc243 AG |
1222 | |
1223 | return rc; | |
1224 | } | |
1225 | ||
de6bbd1d EP |
1226 | /* |
1227 | * to_send and len_sent accounting are very loose estimates. We aren't | |
1228 | * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being | |
25985edc | 1229 | * within about 500 bytes (next page boundary) |
de6bbd1d EP |
1230 | * |
1231 | * why snprintf? an int is up to 12 digits long. if we just assumed when | |
1232 | * logging that a[%d]= was going to be 16 characters long we would be wasting | |
1233 | * space in every audit message. In one 7500 byte message we can log up to | |
1234 | * about 1000 min size arguments. That comes down to about 50% waste of space | |
1235 | * if we didn't do the snprintf to find out how long arg_num_len was. | |
1236 | */ | |
1237 | static int audit_log_single_execve_arg(struct audit_context *context, | |
1238 | struct audit_buffer **ab, | |
1239 | int arg_num, | |
1240 | size_t *len_sent, | |
1241 | const char __user *p, | |
1242 | char *buf) | |
bdf4c48a | 1243 | { |
de6bbd1d EP |
1244 | char arg_num_len_buf[12]; |
1245 | const char __user *tmp_p = p; | |
b87ce6e4 EP |
1246 | /* how many digits are in arg_num? 5 is the length of ' a=""' */ |
1247 | size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5; | |
de6bbd1d EP |
1248 | size_t len, len_left, to_send; |
1249 | size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; | |
1250 | unsigned int i, has_cntl = 0, too_long = 0; | |
1251 | int ret; | |
1252 | ||
1253 | /* strnlen_user includes the null we don't want to send */ | |
1254 | len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
bdf4c48a | 1255 | |
de6bbd1d EP |
1256 | /* |
1257 | * We just created this mm, if we can't find the strings | |
1258 | * we just copied into it something is _very_ wrong. Similar | |
1259 | * for strings that are too long, we should not have created | |
1260 | * any. | |
1261 | */ | |
b0abcfc1 | 1262 | if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) { |
de6bbd1d EP |
1263 | WARN_ON(1); |
1264 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1265 | return -1; |
de6bbd1d | 1266 | } |
040b3a2d | 1267 | |
de6bbd1d EP |
1268 | /* walk the whole argument looking for non-ascii chars */ |
1269 | do { | |
1270 | if (len_left > MAX_EXECVE_AUDIT_LEN) | |
1271 | to_send = MAX_EXECVE_AUDIT_LEN; | |
1272 | else | |
1273 | to_send = len_left; | |
1274 | ret = copy_from_user(buf, tmp_p, to_send); | |
bdf4c48a | 1275 | /* |
de6bbd1d EP |
1276 | * There is no reason for this copy to be short. We just |
1277 | * copied them here, and the mm hasn't been exposed to user- | |
1278 | * space yet. | |
bdf4c48a | 1279 | */ |
de6bbd1d | 1280 | if (ret) { |
bdf4c48a PZ |
1281 | WARN_ON(1); |
1282 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1283 | return -1; |
bdf4c48a | 1284 | } |
de6bbd1d EP |
1285 | buf[to_send] = '\0'; |
1286 | has_cntl = audit_string_contains_control(buf, to_send); | |
1287 | if (has_cntl) { | |
1288 | /* | |
1289 | * hex messages get logged as 2 bytes, so we can only | |
1290 | * send half as much in each message | |
1291 | */ | |
1292 | max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2; | |
bdf4c48a PZ |
1293 | break; |
1294 | } | |
de6bbd1d EP |
1295 | len_left -= to_send; |
1296 | tmp_p += to_send; | |
1297 | } while (len_left > 0); | |
1298 | ||
1299 | len_left = len; | |
1300 | ||
1301 | if (len > max_execve_audit_len) | |
1302 | too_long = 1; | |
1303 | ||
1304 | /* rewalk the argument actually logging the message */ | |
1305 | for (i = 0; len_left > 0; i++) { | |
1306 | int room_left; | |
1307 | ||
1308 | if (len_left > max_execve_audit_len) | |
1309 | to_send = max_execve_audit_len; | |
1310 | else | |
1311 | to_send = len_left; | |
1312 | ||
1313 | /* do we have space left to send this argument in this ab? */ | |
1314 | room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent; | |
1315 | if (has_cntl) | |
1316 | room_left -= (to_send * 2); | |
1317 | else | |
1318 | room_left -= to_send; | |
1319 | if (room_left < 0) { | |
1320 | *len_sent = 0; | |
1321 | audit_log_end(*ab); | |
1322 | *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE); | |
1323 | if (!*ab) | |
1324 | return 0; | |
1325 | } | |
bdf4c48a | 1326 | |
bdf4c48a | 1327 | /* |
de6bbd1d EP |
1328 | * first record needs to say how long the original string was |
1329 | * so we can be sure nothing was lost. | |
1330 | */ | |
1331 | if ((i == 0) && (too_long)) | |
ca96a895 | 1332 | audit_log_format(*ab, " a%d_len=%zu", arg_num, |
de6bbd1d EP |
1333 | has_cntl ? 2*len : len); |
1334 | ||
1335 | /* | |
1336 | * normally arguments are small enough to fit and we already | |
1337 | * filled buf above when we checked for control characters | |
1338 | * so don't bother with another copy_from_user | |
bdf4c48a | 1339 | */ |
de6bbd1d EP |
1340 | if (len >= max_execve_audit_len) |
1341 | ret = copy_from_user(buf, p, to_send); | |
1342 | else | |
1343 | ret = 0; | |
040b3a2d | 1344 | if (ret) { |
bdf4c48a PZ |
1345 | WARN_ON(1); |
1346 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1347 | return -1; |
bdf4c48a | 1348 | } |
de6bbd1d EP |
1349 | buf[to_send] = '\0'; |
1350 | ||
1351 | /* actually log it */ | |
ca96a895 | 1352 | audit_log_format(*ab, " a%d", arg_num); |
de6bbd1d EP |
1353 | if (too_long) |
1354 | audit_log_format(*ab, "[%d]", i); | |
1355 | audit_log_format(*ab, "="); | |
1356 | if (has_cntl) | |
b556f8ad | 1357 | audit_log_n_hex(*ab, buf, to_send); |
de6bbd1d | 1358 | else |
9d960985 | 1359 | audit_log_string(*ab, buf); |
de6bbd1d EP |
1360 | |
1361 | p += to_send; | |
1362 | len_left -= to_send; | |
1363 | *len_sent += arg_num_len; | |
1364 | if (has_cntl) | |
1365 | *len_sent += to_send * 2; | |
1366 | else | |
1367 | *len_sent += to_send; | |
1368 | } | |
1369 | /* include the null we didn't log */ | |
1370 | return len + 1; | |
1371 | } | |
1372 | ||
1373 | static void audit_log_execve_info(struct audit_context *context, | |
1374 | struct audit_buffer **ab, | |
1375 | struct audit_aux_data_execve *axi) | |
1376 | { | |
5afb8a3f XW |
1377 | int i, len; |
1378 | size_t len_sent = 0; | |
de6bbd1d EP |
1379 | const char __user *p; |
1380 | char *buf; | |
bdf4c48a | 1381 | |
de6bbd1d EP |
1382 | if (axi->mm != current->mm) |
1383 | return; /* execve failed, no additional info */ | |
1384 | ||
1385 | p = (const char __user *)axi->mm->arg_start; | |
bdf4c48a | 1386 | |
ca96a895 | 1387 | audit_log_format(*ab, "argc=%d", axi->argc); |
de6bbd1d EP |
1388 | |
1389 | /* | |
1390 | * we need some kernel buffer to hold the userspace args. Just | |
1391 | * allocate one big one rather than allocating one of the right size | |
1392 | * for every single argument inside audit_log_single_execve_arg() | |
1393 | * should be <8k allocation so should be pretty safe. | |
1394 | */ | |
1395 | buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1396 | if (!buf) { | |
1397 | audit_panic("out of memory for argv string\n"); | |
1398 | return; | |
bdf4c48a | 1399 | } |
de6bbd1d EP |
1400 | |
1401 | for (i = 0; i < axi->argc; i++) { | |
1402 | len = audit_log_single_execve_arg(context, ab, i, | |
1403 | &len_sent, p, buf); | |
1404 | if (len <= 0) | |
1405 | break; | |
1406 | p += len; | |
1407 | } | |
1408 | kfree(buf); | |
bdf4c48a PZ |
1409 | } |
1410 | ||
851f7ff5 EP |
1411 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1412 | { | |
1413 | int i; | |
1414 | ||
1415 | audit_log_format(ab, " %s=", prefix); | |
1416 | CAP_FOR_EACH_U32(i) { | |
1417 | audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1422 | { | |
1423 | kernel_cap_t *perm = &name->fcap.permitted; | |
1424 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1425 | int log = 0; | |
1426 | ||
1427 | if (!cap_isclear(*perm)) { | |
1428 | audit_log_cap(ab, "cap_fp", perm); | |
1429 | log = 1; | |
1430 | } | |
1431 | if (!cap_isclear(*inh)) { | |
1432 | audit_log_cap(ab, "cap_fi", inh); | |
1433 | log = 1; | |
1434 | } | |
1435 | ||
1436 | if (log) | |
1437 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); | |
1438 | } | |
1439 | ||
a33e6751 | 1440 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1441 | { |
1442 | struct audit_buffer *ab; | |
1443 | int i; | |
1444 | ||
1445 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1446 | if (!ab) | |
1447 | return; | |
1448 | ||
1449 | switch (context->type) { | |
1450 | case AUDIT_SOCKETCALL: { | |
1451 | int nargs = context->socketcall.nargs; | |
1452 | audit_log_format(ab, "nargs=%d", nargs); | |
1453 | for (i = 0; i < nargs; i++) | |
1454 | audit_log_format(ab, " a%d=%lx", i, | |
1455 | context->socketcall.args[i]); | |
1456 | break; } | |
a33e6751 AV |
1457 | case AUDIT_IPC: { |
1458 | u32 osid = context->ipc.osid; | |
1459 | ||
2570ebbd | 1460 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1461 | from_kuid(&init_user_ns, context->ipc.uid), |
1462 | from_kgid(&init_user_ns, context->ipc.gid), | |
1463 | context->ipc.mode); | |
a33e6751 AV |
1464 | if (osid) { |
1465 | char *ctx = NULL; | |
1466 | u32 len; | |
1467 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1468 | audit_log_format(ab, " osid=%u", osid); | |
1469 | *call_panic = 1; | |
1470 | } else { | |
1471 | audit_log_format(ab, " obj=%s", ctx); | |
1472 | security_release_secctx(ctx, len); | |
1473 | } | |
1474 | } | |
e816f370 AV |
1475 | if (context->ipc.has_perm) { |
1476 | audit_log_end(ab); | |
1477 | ab = audit_log_start(context, GFP_KERNEL, | |
1478 | AUDIT_IPC_SET_PERM); | |
0644ec0c KC |
1479 | if (unlikely(!ab)) |
1480 | return; | |
e816f370 | 1481 | audit_log_format(ab, |
2570ebbd | 1482 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1483 | context->ipc.qbytes, |
1484 | context->ipc.perm_uid, | |
1485 | context->ipc.perm_gid, | |
1486 | context->ipc.perm_mode); | |
e816f370 | 1487 | } |
a33e6751 | 1488 | break; } |
564f6993 AV |
1489 | case AUDIT_MQ_OPEN: { |
1490 | audit_log_format(ab, | |
df0a4283 | 1491 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1492 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1493 | context->mq_open.oflag, context->mq_open.mode, | |
1494 | context->mq_open.attr.mq_flags, | |
1495 | context->mq_open.attr.mq_maxmsg, | |
1496 | context->mq_open.attr.mq_msgsize, | |
1497 | context->mq_open.attr.mq_curmsgs); | |
1498 | break; } | |
c32c8af4 AV |
1499 | case AUDIT_MQ_SENDRECV: { |
1500 | audit_log_format(ab, | |
1501 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
1502 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
1503 | context->mq_sendrecv.mqdes, | |
1504 | context->mq_sendrecv.msg_len, | |
1505 | context->mq_sendrecv.msg_prio, | |
1506 | context->mq_sendrecv.abs_timeout.tv_sec, | |
1507 | context->mq_sendrecv.abs_timeout.tv_nsec); | |
1508 | break; } | |
20114f71 AV |
1509 | case AUDIT_MQ_NOTIFY: { |
1510 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", | |
1511 | context->mq_notify.mqdes, | |
1512 | context->mq_notify.sigev_signo); | |
1513 | break; } | |
7392906e AV |
1514 | case AUDIT_MQ_GETSETATTR: { |
1515 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1516 | audit_log_format(ab, | |
1517 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1518 | "mq_curmsgs=%ld ", | |
1519 | context->mq_getsetattr.mqdes, | |
1520 | attr->mq_flags, attr->mq_maxmsg, | |
1521 | attr->mq_msgsize, attr->mq_curmsgs); | |
1522 | break; } | |
57f71a0a AV |
1523 | case AUDIT_CAPSET: { |
1524 | audit_log_format(ab, "pid=%d", context->capset.pid); | |
1525 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1526 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1527 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
1528 | break; } | |
120a795d AV |
1529 | case AUDIT_MMAP: { |
1530 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, | |
1531 | context->mmap.flags); | |
1532 | break; } | |
f3298dc4 AV |
1533 | } |
1534 | audit_log_end(ab); | |
1535 | } | |
1536 | ||
5195d8e2 EP |
1537 | static void audit_log_name(struct audit_context *context, struct audit_names *n, |
1538 | int record_num, int *call_panic) | |
1539 | { | |
1540 | struct audit_buffer *ab; | |
1541 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1542 | if (!ab) | |
1543 | return; /* audit_panic has been called */ | |
1544 | ||
1545 | audit_log_format(ab, "item=%d", record_num); | |
1546 | ||
1547 | if (n->name) { | |
1548 | switch (n->name_len) { | |
1549 | case AUDIT_NAME_FULL: | |
1550 | /* log the full path */ | |
1551 | audit_log_format(ab, " name="); | |
91a27b2a | 1552 | audit_log_untrustedstring(ab, n->name->name); |
5195d8e2 EP |
1553 | break; |
1554 | case 0: | |
1555 | /* name was specified as a relative path and the | |
1556 | * directory component is the cwd */ | |
c158a35c | 1557 | audit_log_d_path(ab, " name=", &context->pwd); |
5195d8e2 EP |
1558 | break; |
1559 | default: | |
1560 | /* log the name's directory component */ | |
1561 | audit_log_format(ab, " name="); | |
91a27b2a | 1562 | audit_log_n_untrustedstring(ab, n->name->name, |
5195d8e2 EP |
1563 | n->name_len); |
1564 | } | |
1565 | } else | |
1566 | audit_log_format(ab, " name=(null)"); | |
1567 | ||
1568 | if (n->ino != (unsigned long)-1) { | |
1569 | audit_log_format(ab, " inode=%lu" | |
1570 | " dev=%02x:%02x mode=%#ho" | |
1571 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1572 | n->ino, | |
1573 | MAJOR(n->dev), | |
1574 | MINOR(n->dev), | |
1575 | n->mode, | |
cca080d9 EB |
1576 | from_kuid(&init_user_ns, n->uid), |
1577 | from_kgid(&init_user_ns, n->gid), | |
5195d8e2 EP |
1578 | MAJOR(n->rdev), |
1579 | MINOR(n->rdev)); | |
1580 | } | |
1581 | if (n->osid != 0) { | |
1582 | char *ctx = NULL; | |
1583 | u32 len; | |
1584 | if (security_secid_to_secctx( | |
1585 | n->osid, &ctx, &len)) { | |
1586 | audit_log_format(ab, " osid=%u", n->osid); | |
1587 | *call_panic = 2; | |
1588 | } else { | |
1589 | audit_log_format(ab, " obj=%s", ctx); | |
1590 | security_release_secctx(ctx, len); | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | audit_log_fcaps(ab, n); | |
1595 | ||
1596 | audit_log_end(ab); | |
1597 | } | |
1598 | ||
e495149b | 1599 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1600 | { |
9c7aa6aa | 1601 | int i, call_panic = 0; |
1da177e4 | 1602 | struct audit_buffer *ab; |
7551ced3 | 1603 | struct audit_aux_data *aux; |
5195d8e2 | 1604 | struct audit_names *n; |
1da177e4 | 1605 | |
e495149b | 1606 | /* tsk == current */ |
3f2792ff | 1607 | context->personality = tsk->personality; |
e495149b AV |
1608 | |
1609 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1610 | if (!ab) |
1611 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1612 | audit_log_format(ab, "arch=%x syscall=%d", |
1613 | context->arch, context->major); | |
1da177e4 LT |
1614 | if (context->personality != PER_LINUX) |
1615 | audit_log_format(ab, " per=%lx", context->personality); | |
1616 | if (context->return_valid) | |
9f8dbe9c | 1617 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1618 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1619 | context->return_code); | |
eb84a20e | 1620 | |
1da177e4 | 1621 | audit_log_format(ab, |
e23eb920 PM |
1622 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1623 | context->argv[0], | |
1624 | context->argv[1], | |
1625 | context->argv[2], | |
1626 | context->argv[3], | |
1627 | context->name_count); | |
eb84a20e | 1628 | |
e495149b | 1629 | audit_log_task_info(ab, tsk); |
9d960985 | 1630 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1631 | audit_log_end(ab); |
1da177e4 | 1632 | |
7551ced3 | 1633 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1634 | |
e495149b | 1635 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1636 | if (!ab) |
1637 | continue; /* audit_panic has been called */ | |
1638 | ||
1da177e4 | 1639 | switch (aux->type) { |
20ca73bc | 1640 | |
473ae30b AV |
1641 | case AUDIT_EXECVE: { |
1642 | struct audit_aux_data_execve *axi = (void *)aux; | |
de6bbd1d | 1643 | audit_log_execve_info(context, &ab, axi); |
473ae30b | 1644 | break; } |
073115d6 | 1645 | |
3fc689e9 EP |
1646 | case AUDIT_BPRM_FCAPS: { |
1647 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1648 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1649 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1650 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1651 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1652 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1653 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1654 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
1655 | audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted); | |
1656 | audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); | |
1657 | audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); | |
1658 | break; } | |
1659 | ||
1da177e4 LT |
1660 | } |
1661 | audit_log_end(ab); | |
1da177e4 LT |
1662 | } |
1663 | ||
f3298dc4 | 1664 | if (context->type) |
a33e6751 | 1665 | show_special(context, &call_panic); |
f3298dc4 | 1666 | |
157cf649 AV |
1667 | if (context->fds[0] >= 0) { |
1668 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1669 | if (ab) { | |
1670 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1671 | context->fds[0], context->fds[1]); | |
1672 | audit_log_end(ab); | |
1673 | } | |
1674 | } | |
1675 | ||
4f6b434f AV |
1676 | if (context->sockaddr_len) { |
1677 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1678 | if (ab) { | |
1679 | audit_log_format(ab, "saddr="); | |
1680 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1681 | context->sockaddr_len); | |
1682 | audit_log_end(ab); | |
1683 | } | |
1684 | } | |
1685 | ||
e54dc243 AG |
1686 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1687 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1688 | |
1689 | for (i = 0; i < axs->pid_count; i++) | |
1690 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1691 | axs->target_auid[i], |
1692 | axs->target_uid[i], | |
4746ec5b | 1693 | axs->target_sessionid[i], |
c2a7780e EP |
1694 | axs->target_sid[i], |
1695 | axs->target_comm[i])) | |
e54dc243 | 1696 | call_panic = 1; |
a5cb013d AV |
1697 | } |
1698 | ||
e54dc243 AG |
1699 | if (context->target_pid && |
1700 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1701 | context->target_auid, context->target_uid, |
4746ec5b | 1702 | context->target_sessionid, |
c2a7780e | 1703 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1704 | call_panic = 1; |
1705 | ||
44707fdf | 1706 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1707 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1708 | if (ab) { |
c158a35c | 1709 | audit_log_d_path(ab, " cwd=", &context->pwd); |
8f37d47c DW |
1710 | audit_log_end(ab); |
1711 | } | |
1712 | } | |
73241ccc | 1713 | |
5195d8e2 EP |
1714 | i = 0; |
1715 | list_for_each_entry(n, &context->names_list, list) | |
1716 | audit_log_name(context, n, i++, &call_panic); | |
c0641f28 EP |
1717 | |
1718 | /* Send end of event record to help user space know we are finished */ | |
1719 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1720 | if (ab) | |
1721 | audit_log_end(ab); | |
9c7aa6aa SG |
1722 | if (call_panic) |
1723 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1724 | } |
1725 | ||
b0dd25a8 RD |
1726 | /** |
1727 | * audit_free - free a per-task audit context | |
1728 | * @tsk: task whose audit context block to free | |
1729 | * | |
fa84cb93 | 1730 | * Called from copy_process and do_exit |
b0dd25a8 | 1731 | */ |
a4ff8dba | 1732 | void __audit_free(struct task_struct *tsk) |
1da177e4 LT |
1733 | { |
1734 | struct audit_context *context; | |
1735 | ||
1da177e4 | 1736 | context = audit_get_context(tsk, 0, 0); |
56179a6e | 1737 | if (!context) |
1da177e4 LT |
1738 | return; |
1739 | ||
1740 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1741 | * function (e.g., exit_group), then free context block. |
1742 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1743 | * in the context of the idle thread */ |
e495149b | 1744 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1745 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1746 | audit_log_exit(context, tsk); |
916d7576 AV |
1747 | if (!list_empty(&context->killed_trees)) |
1748 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1749 | |
1750 | audit_free_context(context); | |
1751 | } | |
1752 | ||
b0dd25a8 RD |
1753 | /** |
1754 | * audit_syscall_entry - fill in an audit record at syscall entry | |
b0dd25a8 RD |
1755 | * @arch: architecture type |
1756 | * @major: major syscall type (function) | |
1757 | * @a1: additional syscall register 1 | |
1758 | * @a2: additional syscall register 2 | |
1759 | * @a3: additional syscall register 3 | |
1760 | * @a4: additional syscall register 4 | |
1761 | * | |
1762 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1763 | * audit context was created when the task was created and the state or |
1764 | * filters demand the audit context be built. If the state from the | |
1765 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1766 | * then the record will be written at syscall exit time (otherwise, it | |
1767 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1768 | * be written). |
1769 | */ | |
b05d8447 | 1770 | void __audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1771 | unsigned long a1, unsigned long a2, |
1772 | unsigned long a3, unsigned long a4) | |
1773 | { | |
5411be59 | 1774 | struct task_struct *tsk = current; |
1da177e4 LT |
1775 | struct audit_context *context = tsk->audit_context; |
1776 | enum audit_state state; | |
1777 | ||
56179a6e | 1778 | if (!context) |
86a1c34a | 1779 | return; |
1da177e4 | 1780 | |
1da177e4 LT |
1781 | BUG_ON(context->in_syscall || context->name_count); |
1782 | ||
1783 | if (!audit_enabled) | |
1784 | return; | |
1785 | ||
2fd6f58b | 1786 | context->arch = arch; |
1da177e4 LT |
1787 | context->major = major; |
1788 | context->argv[0] = a1; | |
1789 | context->argv[1] = a2; | |
1790 | context->argv[2] = a3; | |
1791 | context->argv[3] = a4; | |
1792 | ||
1793 | state = context->state; | |
d51374ad | 1794 | context->dummy = !audit_n_rules; |
0590b933 AV |
1795 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1796 | context->prio = 0; | |
0f45aa18 | 1797 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
0590b933 | 1798 | } |
56179a6e | 1799 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1800 | return; |
1801 | ||
ce625a80 | 1802 | context->serial = 0; |
1da177e4 LT |
1803 | context->ctime = CURRENT_TIME; |
1804 | context->in_syscall = 1; | |
0590b933 | 1805 | context->current_state = state; |
419c58f1 | 1806 | context->ppid = 0; |
1da177e4 LT |
1807 | } |
1808 | ||
b0dd25a8 RD |
1809 | /** |
1810 | * audit_syscall_exit - deallocate audit context after a system call | |
42ae610c RD |
1811 | * @success: success value of the syscall |
1812 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1813 | * |
1814 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1815 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1816 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1817 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1818 | * free the names stored from getname(). |
1819 | */ | |
d7e7528b | 1820 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 | 1821 | { |
5411be59 | 1822 | struct task_struct *tsk = current; |
1da177e4 LT |
1823 | struct audit_context *context; |
1824 | ||
d7e7528b EP |
1825 | if (success) |
1826 | success = AUDITSC_SUCCESS; | |
1827 | else | |
1828 | success = AUDITSC_FAILURE; | |
1da177e4 | 1829 | |
d7e7528b | 1830 | context = audit_get_context(tsk, success, return_code); |
56179a6e | 1831 | if (!context) |
97e94c45 | 1832 | return; |
1da177e4 | 1833 | |
0590b933 | 1834 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1835 | audit_log_exit(context, tsk); |
1da177e4 LT |
1836 | |
1837 | context->in_syscall = 0; | |
0590b933 | 1838 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1839 | |
916d7576 AV |
1840 | if (!list_empty(&context->killed_trees)) |
1841 | audit_kill_trees(&context->killed_trees); | |
1842 | ||
c62d773a AV |
1843 | audit_free_names(context); |
1844 | unroll_tree_refs(context, NULL, 0); | |
1845 | audit_free_aux(context); | |
1846 | context->aux = NULL; | |
1847 | context->aux_pids = NULL; | |
1848 | context->target_pid = 0; | |
1849 | context->target_sid = 0; | |
1850 | context->sockaddr_len = 0; | |
1851 | context->type = 0; | |
1852 | context->fds[0] = -1; | |
1853 | if (context->state != AUDIT_RECORD_CONTEXT) { | |
1854 | kfree(context->filterkey); | |
1855 | context->filterkey = NULL; | |
1da177e4 | 1856 | } |
c62d773a | 1857 | tsk->audit_context = context; |
1da177e4 LT |
1858 | } |
1859 | ||
74c3cbe3 AV |
1860 | static inline void handle_one(const struct inode *inode) |
1861 | { | |
1862 | #ifdef CONFIG_AUDIT_TREE | |
1863 | struct audit_context *context; | |
1864 | struct audit_tree_refs *p; | |
1865 | struct audit_chunk *chunk; | |
1866 | int count; | |
e61ce867 | 1867 | if (likely(hlist_empty(&inode->i_fsnotify_marks))) |
74c3cbe3 AV |
1868 | return; |
1869 | context = current->audit_context; | |
1870 | p = context->trees; | |
1871 | count = context->tree_count; | |
1872 | rcu_read_lock(); | |
1873 | chunk = audit_tree_lookup(inode); | |
1874 | rcu_read_unlock(); | |
1875 | if (!chunk) | |
1876 | return; | |
1877 | if (likely(put_tree_ref(context, chunk))) | |
1878 | return; | |
1879 | if (unlikely(!grow_tree_refs(context))) { | |
436c405c | 1880 | printk(KERN_WARNING "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1881 | audit_set_auditable(context); |
1882 | audit_put_chunk(chunk); | |
1883 | unroll_tree_refs(context, p, count); | |
1884 | return; | |
1885 | } | |
1886 | put_tree_ref(context, chunk); | |
1887 | #endif | |
1888 | } | |
1889 | ||
1890 | static void handle_path(const struct dentry *dentry) | |
1891 | { | |
1892 | #ifdef CONFIG_AUDIT_TREE | |
1893 | struct audit_context *context; | |
1894 | struct audit_tree_refs *p; | |
1895 | const struct dentry *d, *parent; | |
1896 | struct audit_chunk *drop; | |
1897 | unsigned long seq; | |
1898 | int count; | |
1899 | ||
1900 | context = current->audit_context; | |
1901 | p = context->trees; | |
1902 | count = context->tree_count; | |
1903 | retry: | |
1904 | drop = NULL; | |
1905 | d = dentry; | |
1906 | rcu_read_lock(); | |
1907 | seq = read_seqbegin(&rename_lock); | |
1908 | for(;;) { | |
1909 | struct inode *inode = d->d_inode; | |
e61ce867 | 1910 | if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) { |
74c3cbe3 AV |
1911 | struct audit_chunk *chunk; |
1912 | chunk = audit_tree_lookup(inode); | |
1913 | if (chunk) { | |
1914 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1915 | drop = chunk; | |
1916 | break; | |
1917 | } | |
1918 | } | |
1919 | } | |
1920 | parent = d->d_parent; | |
1921 | if (parent == d) | |
1922 | break; | |
1923 | d = parent; | |
1924 | } | |
1925 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1926 | rcu_read_unlock(); | |
1927 | if (!drop) { | |
1928 | /* just a race with rename */ | |
1929 | unroll_tree_refs(context, p, count); | |
1930 | goto retry; | |
1931 | } | |
1932 | audit_put_chunk(drop); | |
1933 | if (grow_tree_refs(context)) { | |
1934 | /* OK, got more space */ | |
1935 | unroll_tree_refs(context, p, count); | |
1936 | goto retry; | |
1937 | } | |
1938 | /* too bad */ | |
1939 | printk(KERN_WARNING | |
436c405c | 1940 | "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1941 | unroll_tree_refs(context, p, count); |
1942 | audit_set_auditable(context); | |
1943 | return; | |
1944 | } | |
1945 | rcu_read_unlock(); | |
1946 | #endif | |
1947 | } | |
1948 | ||
78e2e802 JL |
1949 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1950 | unsigned char type) | |
5195d8e2 EP |
1951 | { |
1952 | struct audit_names *aname; | |
1953 | ||
1954 | if (context->name_count < AUDIT_NAMES) { | |
1955 | aname = &context->preallocated_names[context->name_count]; | |
1956 | memset(aname, 0, sizeof(*aname)); | |
1957 | } else { | |
1958 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1959 | if (!aname) | |
1960 | return NULL; | |
1961 | aname->should_free = true; | |
1962 | } | |
1963 | ||
1964 | aname->ino = (unsigned long)-1; | |
78e2e802 | 1965 | aname->type = type; |
5195d8e2 EP |
1966 | list_add_tail(&aname->list, &context->names_list); |
1967 | ||
1968 | context->name_count++; | |
1969 | #if AUDIT_DEBUG | |
1970 | context->ino_count++; | |
1971 | #endif | |
1972 | return aname; | |
1973 | } | |
1974 | ||
7ac86265 JL |
1975 | /** |
1976 | * audit_reusename - fill out filename with info from existing entry | |
1977 | * @uptr: userland ptr to pathname | |
1978 | * | |
1979 | * Search the audit_names list for the current audit context. If there is an | |
1980 | * existing entry with a matching "uptr" then return the filename | |
1981 | * associated with that audit_name. If not, return NULL. | |
1982 | */ | |
1983 | struct filename * | |
1984 | __audit_reusename(const __user char *uptr) | |
1985 | { | |
1986 | struct audit_context *context = current->audit_context; | |
1987 | struct audit_names *n; | |
1988 | ||
1989 | list_for_each_entry(n, &context->names_list, list) { | |
1990 | if (!n->name) | |
1991 | continue; | |
1992 | if (n->name->uptr == uptr) | |
1993 | return n->name; | |
1994 | } | |
1995 | return NULL; | |
1996 | } | |
1997 | ||
b0dd25a8 RD |
1998 | /** |
1999 | * audit_getname - add a name to the list | |
2000 | * @name: name to add | |
2001 | * | |
2002 | * Add a name to the list of audit names for this context. | |
2003 | * Called from fs/namei.c:getname(). | |
2004 | */ | |
91a27b2a | 2005 | void __audit_getname(struct filename *name) |
1da177e4 LT |
2006 | { |
2007 | struct audit_context *context = current->audit_context; | |
5195d8e2 | 2008 | struct audit_names *n; |
1da177e4 | 2009 | |
1da177e4 LT |
2010 | if (!context->in_syscall) { |
2011 | #if AUDIT_DEBUG == 2 | |
2012 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
2013 | __FILE__, __LINE__, context->serial, name); | |
2014 | dump_stack(); | |
2015 | #endif | |
2016 | return; | |
2017 | } | |
5195d8e2 | 2018 | |
91a27b2a JL |
2019 | #if AUDIT_DEBUG |
2020 | /* The filename _must_ have a populated ->name */ | |
2021 | BUG_ON(!name->name); | |
2022 | #endif | |
2023 | ||
78e2e802 | 2024 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
2025 | if (!n) |
2026 | return; | |
2027 | ||
2028 | n->name = name; | |
2029 | n->name_len = AUDIT_NAME_FULL; | |
2030 | n->name_put = true; | |
adb5c247 | 2031 | name->aname = n; |
5195d8e2 | 2032 | |
f7ad3c6b MS |
2033 | if (!context->pwd.dentry) |
2034 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
2035 | } |
2036 | ||
b0dd25a8 RD |
2037 | /* audit_putname - intercept a putname request |
2038 | * @name: name to intercept and delay for putname | |
2039 | * | |
2040 | * If we have stored the name from getname in the audit context, | |
2041 | * then we delay the putname until syscall exit. | |
2042 | * Called from include/linux/fs.h:putname(). | |
2043 | */ | |
91a27b2a | 2044 | void audit_putname(struct filename *name) |
1da177e4 LT |
2045 | { |
2046 | struct audit_context *context = current->audit_context; | |
2047 | ||
2048 | BUG_ON(!context); | |
2049 | if (!context->in_syscall) { | |
2050 | #if AUDIT_DEBUG == 2 | |
65ada7bc | 2051 | printk(KERN_ERR "%s:%d(:%d): final_putname(%p)\n", |
1da177e4 LT |
2052 | __FILE__, __LINE__, context->serial, name); |
2053 | if (context->name_count) { | |
5195d8e2 | 2054 | struct audit_names *n; |
34c474de | 2055 | int i = 0; |
5195d8e2 EP |
2056 | |
2057 | list_for_each_entry(n, &context->names_list, list) | |
34c474de | 2058 | printk(KERN_ERR "name[%d] = %p = %s\n", i++, |
91a27b2a | 2059 | n->name, n->name->name ?: "(null)"); |
5195d8e2 | 2060 | } |
1da177e4 | 2061 | #endif |
65ada7bc | 2062 | final_putname(name); |
1da177e4 LT |
2063 | } |
2064 | #if AUDIT_DEBUG | |
2065 | else { | |
2066 | ++context->put_count; | |
2067 | if (context->put_count > context->name_count) { | |
2068 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
2069 | " in_syscall=%d putname(%p) name_count=%d" | |
2070 | " put_count=%d\n", | |
2071 | __FILE__, __LINE__, | |
2072 | context->serial, context->major, | |
91a27b2a JL |
2073 | context->in_syscall, name->name, |
2074 | context->name_count, context->put_count); | |
1da177e4 LT |
2075 | dump_stack(); |
2076 | } | |
2077 | } | |
2078 | #endif | |
2079 | } | |
2080 | ||
851f7ff5 EP |
2081 | static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) |
2082 | { | |
2083 | struct cpu_vfs_cap_data caps; | |
2084 | int rc; | |
2085 | ||
851f7ff5 EP |
2086 | if (!dentry) |
2087 | return 0; | |
2088 | ||
2089 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
2090 | if (rc) | |
2091 | return rc; | |
2092 | ||
2093 | name->fcap.permitted = caps.permitted; | |
2094 | name->fcap.inheritable = caps.inheritable; | |
2095 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2096 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2097 | ||
2098 | return 0; | |
2099 | } | |
2100 | ||
2101 | ||
3e2efce0 | 2102 | /* Copy inode data into an audit_names. */ |
851f7ff5 EP |
2103 | static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
2104 | const struct inode *inode) | |
8c8570fb | 2105 | { |
3e2efce0 AG |
2106 | name->ino = inode->i_ino; |
2107 | name->dev = inode->i_sb->s_dev; | |
2108 | name->mode = inode->i_mode; | |
2109 | name->uid = inode->i_uid; | |
2110 | name->gid = inode->i_gid; | |
2111 | name->rdev = inode->i_rdev; | |
2a862b32 | 2112 | security_inode_getsecid(inode, &name->osid); |
851f7ff5 | 2113 | audit_copy_fcaps(name, dentry); |
8c8570fb DK |
2114 | } |
2115 | ||
b0dd25a8 | 2116 | /** |
bfcec708 | 2117 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 2118 | * @name: name being audited |
481968f4 | 2119 | * @dentry: dentry being audited |
bfcec708 | 2120 | * @parent: does this dentry represent the parent? |
b0dd25a8 | 2121 | */ |
adb5c247 | 2122 | void __audit_inode(struct filename *name, const struct dentry *dentry, |
bfcec708 | 2123 | unsigned int parent) |
1da177e4 | 2124 | { |
1da177e4 | 2125 | struct audit_context *context = current->audit_context; |
74c3cbe3 | 2126 | const struct inode *inode = dentry->d_inode; |
5195d8e2 | 2127 | struct audit_names *n; |
1da177e4 LT |
2128 | |
2129 | if (!context->in_syscall) | |
2130 | return; | |
5195d8e2 | 2131 | |
9cec9d68 JL |
2132 | if (!name) |
2133 | goto out_alloc; | |
2134 | ||
adb5c247 JL |
2135 | #if AUDIT_DEBUG |
2136 | /* The struct filename _must_ have a populated ->name */ | |
2137 | BUG_ON(!name->name); | |
2138 | #endif | |
2139 | /* | |
2140 | * If we have a pointer to an audit_names entry already, then we can | |
2141 | * just use it directly if the type is correct. | |
2142 | */ | |
2143 | n = name->aname; | |
2144 | if (n) { | |
2145 | if (parent) { | |
2146 | if (n->type == AUDIT_TYPE_PARENT || | |
2147 | n->type == AUDIT_TYPE_UNKNOWN) | |
2148 | goto out; | |
2149 | } else { | |
2150 | if (n->type != AUDIT_TYPE_PARENT) | |
2151 | goto out; | |
2152 | } | |
2153 | } | |
2154 | ||
5195d8e2 | 2155 | list_for_each_entry_reverse(n, &context->names_list, list) { |
bfcec708 | 2156 | /* does the name pointer match? */ |
adb5c247 | 2157 | if (!n->name || n->name->name != name->name) |
bfcec708 JL |
2158 | continue; |
2159 | ||
2160 | /* match the correct record type */ | |
2161 | if (parent) { | |
2162 | if (n->type == AUDIT_TYPE_PARENT || | |
2163 | n->type == AUDIT_TYPE_UNKNOWN) | |
2164 | goto out; | |
2165 | } else { | |
2166 | if (n->type != AUDIT_TYPE_PARENT) | |
2167 | goto out; | |
2168 | } | |
1da177e4 | 2169 | } |
5195d8e2 | 2170 | |
9cec9d68 | 2171 | out_alloc: |
bfcec708 JL |
2172 | /* unable to find the name from a previous getname(). Allocate a new |
2173 | * anonymous entry. | |
2174 | */ | |
78e2e802 | 2175 | n = audit_alloc_name(context, AUDIT_TYPE_NORMAL); |
5195d8e2 EP |
2176 | if (!n) |
2177 | return; | |
2178 | out: | |
bfcec708 | 2179 | if (parent) { |
91a27b2a | 2180 | n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; |
bfcec708 JL |
2181 | n->type = AUDIT_TYPE_PARENT; |
2182 | } else { | |
2183 | n->name_len = AUDIT_NAME_FULL; | |
2184 | n->type = AUDIT_TYPE_NORMAL; | |
2185 | } | |
74c3cbe3 | 2186 | handle_path(dentry); |
5195d8e2 | 2187 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
2188 | } |
2189 | ||
2190 | /** | |
c43a25ab | 2191 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 2192 | * @parent: inode of dentry parent |
c43a25ab | 2193 | * @dentry: dentry being audited |
4fa6b5ec | 2194 | * @type: AUDIT_TYPE_* value that we're looking for |
73241ccc AG |
2195 | * |
2196 | * For syscalls that create or remove filesystem objects, audit_inode | |
2197 | * can only collect information for the filesystem object's parent. | |
2198 | * This call updates the audit context with the child's information. | |
2199 | * Syscalls that create a new filesystem object must be hooked after | |
2200 | * the object is created. Syscalls that remove a filesystem object | |
2201 | * must be hooked prior, in order to capture the target inode during | |
2202 | * unsuccessful attempts. | |
2203 | */ | |
c43a25ab | 2204 | void __audit_inode_child(const struct inode *parent, |
4fa6b5ec JL |
2205 | const struct dentry *dentry, |
2206 | const unsigned char type) | |
73241ccc | 2207 | { |
73241ccc | 2208 | struct audit_context *context = current->audit_context; |
5a190ae6 | 2209 | const struct inode *inode = dentry->d_inode; |
cccc6bba | 2210 | const char *dname = dentry->d_name.name; |
4fa6b5ec | 2211 | struct audit_names *n, *found_parent = NULL, *found_child = NULL; |
73241ccc AG |
2212 | |
2213 | if (!context->in_syscall) | |
2214 | return; | |
2215 | ||
74c3cbe3 AV |
2216 | if (inode) |
2217 | handle_one(inode); | |
73241ccc | 2218 | |
4fa6b5ec | 2219 | /* look for a parent entry first */ |
5195d8e2 | 2220 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec | 2221 | if (!n->name || n->type != AUDIT_TYPE_PARENT) |
5712e88f AG |
2222 | continue; |
2223 | ||
2224 | if (n->ino == parent->i_ino && | |
91a27b2a | 2225 | !audit_compare_dname_path(dname, n->name->name, n->name_len)) { |
4fa6b5ec JL |
2226 | found_parent = n; |
2227 | break; | |
f368c07d | 2228 | } |
5712e88f | 2229 | } |
73241ccc | 2230 | |
4fa6b5ec | 2231 | /* is there a matching child entry? */ |
5195d8e2 | 2232 | list_for_each_entry(n, &context->names_list, list) { |
4fa6b5ec JL |
2233 | /* can only match entries that have a name */ |
2234 | if (!n->name || n->type != type) | |
2235 | continue; | |
2236 | ||
2237 | /* if we found a parent, make sure this one is a child of it */ | |
2238 | if (found_parent && (n->name != found_parent->name)) | |
5712e88f AG |
2239 | continue; |
2240 | ||
91a27b2a JL |
2241 | if (!strcmp(dname, n->name->name) || |
2242 | !audit_compare_dname_path(dname, n->name->name, | |
4fa6b5ec JL |
2243 | found_parent ? |
2244 | found_parent->name_len : | |
e3d6b07b | 2245 | AUDIT_NAME_FULL)) { |
4fa6b5ec JL |
2246 | found_child = n; |
2247 | break; | |
5712e88f | 2248 | } |
ac9910ce | 2249 | } |
5712e88f | 2250 | |
5712e88f | 2251 | if (!found_parent) { |
4fa6b5ec JL |
2252 | /* create a new, "anonymous" parent record */ |
2253 | n = audit_alloc_name(context, AUDIT_TYPE_PARENT); | |
5195d8e2 | 2254 | if (!n) |
ac9910ce | 2255 | return; |
5195d8e2 | 2256 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 2257 | } |
5712e88f AG |
2258 | |
2259 | if (!found_child) { | |
4fa6b5ec JL |
2260 | found_child = audit_alloc_name(context, type); |
2261 | if (!found_child) | |
5712e88f | 2262 | return; |
5712e88f AG |
2263 | |
2264 | /* Re-use the name belonging to the slot for a matching parent | |
2265 | * directory. All names for this context are relinquished in | |
2266 | * audit_free_names() */ | |
2267 | if (found_parent) { | |
4fa6b5ec JL |
2268 | found_child->name = found_parent->name; |
2269 | found_child->name_len = AUDIT_NAME_FULL; | |
5712e88f | 2270 | /* don't call __putname() */ |
4fa6b5ec | 2271 | found_child->name_put = false; |
5712e88f | 2272 | } |
5712e88f | 2273 | } |
4fa6b5ec JL |
2274 | if (inode) |
2275 | audit_copy_inode(found_child, dentry, inode); | |
2276 | else | |
2277 | found_child->ino = (unsigned long)-1; | |
3e2efce0 | 2278 | } |
50e437d5 | 2279 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2280 | |
b0dd25a8 RD |
2281 | /** |
2282 | * auditsc_get_stamp - get local copies of audit_context values | |
2283 | * @ctx: audit_context for the task | |
2284 | * @t: timespec to store time recorded in the audit_context | |
2285 | * @serial: serial value that is recorded in the audit_context | |
2286 | * | |
2287 | * Also sets the context as auditable. | |
2288 | */ | |
48887e63 | 2289 | int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e | 2290 | struct timespec *t, unsigned int *serial) |
1da177e4 | 2291 | { |
48887e63 AV |
2292 | if (!ctx->in_syscall) |
2293 | return 0; | |
ce625a80 DW |
2294 | if (!ctx->serial) |
2295 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2296 | t->tv_sec = ctx->ctime.tv_sec; |
2297 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2298 | *serial = ctx->serial; | |
0590b933 AV |
2299 | if (!ctx->prio) { |
2300 | ctx->prio = 1; | |
2301 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
2302 | } | |
48887e63 | 2303 | return 1; |
1da177e4 LT |
2304 | } |
2305 | ||
4746ec5b EP |
2306 | /* global counter which is incremented every time something logs in */ |
2307 | static atomic_t session_id = ATOMIC_INIT(0); | |
2308 | ||
b0dd25a8 | 2309 | /** |
0a300be6 | 2310 | * audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a8 RD |
2311 | * @loginuid: loginuid value |
2312 | * | |
2313 | * Returns 0. | |
2314 | * | |
2315 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2316 | */ | |
e1760bd5 | 2317 | int audit_set_loginuid(kuid_t loginuid) |
1da177e4 | 2318 | { |
0a300be6 | 2319 | struct task_struct *task = current; |
41757106 | 2320 | struct audit_context *context = task->audit_context; |
633b4545 | 2321 | unsigned int sessionid; |
41757106 | 2322 | |
633b4545 | 2323 | #ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE |
e1760bd5 | 2324 | if (uid_valid(task->loginuid)) |
633b4545 EP |
2325 | return -EPERM; |
2326 | #else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2327 | if (!capable(CAP_AUDIT_CONTROL)) | |
2328 | return -EPERM; | |
2329 | #endif /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2330 | ||
2331 | sessionid = atomic_inc_return(&session_id); | |
bfef93a5 AV |
2332 | if (context && context->in_syscall) { |
2333 | struct audit_buffer *ab; | |
2334 | ||
2335 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
2336 | if (ab) { | |
2337 | audit_log_format(ab, "login pid=%d uid=%u " | |
4746ec5b EP |
2338 | "old auid=%u new auid=%u" |
2339 | " old ses=%u new ses=%u", | |
cca080d9 EB |
2340 | task->pid, |
2341 | from_kuid(&init_user_ns, task_uid(task)), | |
e1760bd5 EB |
2342 | from_kuid(&init_user_ns, task->loginuid), |
2343 | from_kuid(&init_user_ns, loginuid), | |
4746ec5b | 2344 | task->sessionid, sessionid); |
bfef93a5 | 2345 | audit_log_end(ab); |
c0404993 | 2346 | } |
1da177e4 | 2347 | } |
4746ec5b | 2348 | task->sessionid = sessionid; |
bfef93a5 | 2349 | task->loginuid = loginuid; |
1da177e4 LT |
2350 | return 0; |
2351 | } | |
2352 | ||
20ca73bc GW |
2353 | /** |
2354 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2355 | * @oflag: open flag | |
2356 | * @mode: mode bits | |
6b962559 | 2357 | * @attr: queue attributes |
20ca73bc | 2358 | * |
20ca73bc | 2359 | */ |
df0a4283 | 2360 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2361 | { |
20ca73bc GW |
2362 | struct audit_context *context = current->audit_context; |
2363 | ||
564f6993 AV |
2364 | if (attr) |
2365 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2366 | else | |
2367 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2368 | |
564f6993 AV |
2369 | context->mq_open.oflag = oflag; |
2370 | context->mq_open.mode = mode; | |
20ca73bc | 2371 | |
564f6993 | 2372 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2373 | } |
2374 | ||
2375 | /** | |
c32c8af4 | 2376 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2377 | * @mqdes: MQ descriptor |
2378 | * @msg_len: Message length | |
2379 | * @msg_prio: Message priority | |
c32c8af4 | 2380 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2381 | * |
20ca73bc | 2382 | */ |
c32c8af4 AV |
2383 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
2384 | const struct timespec *abs_timeout) | |
20ca73bc | 2385 | { |
20ca73bc | 2386 | struct audit_context *context = current->audit_context; |
c32c8af4 | 2387 | struct timespec *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2388 | |
c32c8af4 AV |
2389 | if (abs_timeout) |
2390 | memcpy(p, abs_timeout, sizeof(struct timespec)); | |
2391 | else | |
2392 | memset(p, 0, sizeof(struct timespec)); | |
20ca73bc | 2393 | |
c32c8af4 AV |
2394 | context->mq_sendrecv.mqdes = mqdes; |
2395 | context->mq_sendrecv.msg_len = msg_len; | |
2396 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2397 | |
c32c8af4 | 2398 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2399 | } |
2400 | ||
2401 | /** | |
2402 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2403 | * @mqdes: MQ descriptor | |
6b962559 | 2404 | * @notification: Notification event |
20ca73bc | 2405 | * |
20ca73bc GW |
2406 | */ |
2407 | ||
20114f71 | 2408 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2409 | { |
20ca73bc GW |
2410 | struct audit_context *context = current->audit_context; |
2411 | ||
20114f71 AV |
2412 | if (notification) |
2413 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2414 | else | |
2415 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2416 | |
20114f71 AV |
2417 | context->mq_notify.mqdes = mqdes; |
2418 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2419 | } |
2420 | ||
2421 | /** | |
2422 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2423 | * @mqdes: MQ descriptor | |
2424 | * @mqstat: MQ flags | |
2425 | * | |
20ca73bc | 2426 | */ |
7392906e | 2427 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2428 | { |
20ca73bc | 2429 | struct audit_context *context = current->audit_context; |
7392906e AV |
2430 | context->mq_getsetattr.mqdes = mqdes; |
2431 | context->mq_getsetattr.mqstat = *mqstat; | |
2432 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2433 | } |
2434 | ||
b0dd25a8 | 2435 | /** |
073115d6 SG |
2436 | * audit_ipc_obj - record audit data for ipc object |
2437 | * @ipcp: ipc permissions | |
2438 | * | |
073115d6 | 2439 | */ |
a33e6751 | 2440 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2441 | { |
073115d6 | 2442 | struct audit_context *context = current->audit_context; |
a33e6751 AV |
2443 | context->ipc.uid = ipcp->uid; |
2444 | context->ipc.gid = ipcp->gid; | |
2445 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2446 | context->ipc.has_perm = 0; |
a33e6751 AV |
2447 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2448 | context->type = AUDIT_IPC; | |
073115d6 SG |
2449 | } |
2450 | ||
2451 | /** | |
2452 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
2453 | * @qbytes: msgq bytes |
2454 | * @uid: msgq user id | |
2455 | * @gid: msgq group id | |
2456 | * @mode: msgq mode (permissions) | |
2457 | * | |
e816f370 | 2458 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2459 | */ |
2570ebbd | 2460 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2461 | { |
1da177e4 LT |
2462 | struct audit_context *context = current->audit_context; |
2463 | ||
e816f370 AV |
2464 | context->ipc.qbytes = qbytes; |
2465 | context->ipc.perm_uid = uid; | |
2466 | context->ipc.perm_gid = gid; | |
2467 | context->ipc.perm_mode = mode; | |
2468 | context->ipc.has_perm = 1; | |
1da177e4 | 2469 | } |
c2f0c7c3 | 2470 | |
07c49417 | 2471 | int __audit_bprm(struct linux_binprm *bprm) |
473ae30b AV |
2472 | { |
2473 | struct audit_aux_data_execve *ax; | |
2474 | struct audit_context *context = current->audit_context; | |
473ae30b | 2475 | |
bdf4c48a | 2476 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); |
473ae30b AV |
2477 | if (!ax) |
2478 | return -ENOMEM; | |
2479 | ||
2480 | ax->argc = bprm->argc; | |
2481 | ax->envc = bprm->envc; | |
bdf4c48a | 2482 | ax->mm = bprm->mm; |
473ae30b AV |
2483 | ax->d.type = AUDIT_EXECVE; |
2484 | ax->d.next = context->aux; | |
2485 | context->aux = (void *)ax; | |
2486 | return 0; | |
2487 | } | |
2488 | ||
2489 | ||
b0dd25a8 RD |
2490 | /** |
2491 | * audit_socketcall - record audit data for sys_socketcall | |
2950fa9d | 2492 | * @nargs: number of args, which should not be more than AUDITSC_ARGS. |
b0dd25a8 RD |
2493 | * @args: args array |
2494 | * | |
b0dd25a8 | 2495 | */ |
2950fa9d | 2496 | int __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2497 | { |
3ec3b2fb DW |
2498 | struct audit_context *context = current->audit_context; |
2499 | ||
2950fa9d CG |
2500 | if (nargs <= 0 || nargs > AUDITSC_ARGS || !args) |
2501 | return -EINVAL; | |
f3298dc4 AV |
2502 | context->type = AUDIT_SOCKETCALL; |
2503 | context->socketcall.nargs = nargs; | |
2504 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
2950fa9d | 2505 | return 0; |
3ec3b2fb DW |
2506 | } |
2507 | ||
db349509 AV |
2508 | /** |
2509 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2510 | * @fd1: the first file descriptor | |
2511 | * @fd2: the second file descriptor | |
2512 | * | |
db349509 | 2513 | */ |
157cf649 | 2514 | void __audit_fd_pair(int fd1, int fd2) |
db349509 AV |
2515 | { |
2516 | struct audit_context *context = current->audit_context; | |
157cf649 AV |
2517 | context->fds[0] = fd1; |
2518 | context->fds[1] = fd2; | |
db349509 AV |
2519 | } |
2520 | ||
b0dd25a8 RD |
2521 | /** |
2522 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
2523 | * @len: data length in user space | |
2524 | * @a: data address in kernel space | |
2525 | * | |
2526 | * Returns 0 for success or NULL context or < 0 on error. | |
2527 | */ | |
07c49417 | 2528 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2529 | { |
3ec3b2fb DW |
2530 | struct audit_context *context = current->audit_context; |
2531 | ||
4f6b434f AV |
2532 | if (!context->sockaddr) { |
2533 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2534 | if (!p) | |
2535 | return -ENOMEM; | |
2536 | context->sockaddr = p; | |
2537 | } | |
3ec3b2fb | 2538 | |
4f6b434f AV |
2539 | context->sockaddr_len = len; |
2540 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2541 | return 0; |
2542 | } | |
2543 | ||
a5cb013d AV |
2544 | void __audit_ptrace(struct task_struct *t) |
2545 | { | |
2546 | struct audit_context *context = current->audit_context; | |
2547 | ||
2548 | context->target_pid = t->pid; | |
c2a7780e | 2549 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2550 | context->target_uid = task_uid(t); |
4746ec5b | 2551 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2552 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2553 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2554 | } |
2555 | ||
b0dd25a8 RD |
2556 | /** |
2557 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2558 | * @sig: signal value | |
2559 | * @t: task being signaled | |
2560 | * | |
2561 | * If the audit subsystem is being terminated, record the task (pid) | |
2562 | * and uid that is doing that. | |
2563 | */ | |
e54dc243 | 2564 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2565 | { |
e54dc243 AG |
2566 | struct audit_aux_data_pids *axp; |
2567 | struct task_struct *tsk = current; | |
2568 | struct audit_context *ctx = tsk->audit_context; | |
cca080d9 | 2569 | kuid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065 | 2570 | |
175fc484 | 2571 | if (audit_pid && t->tgid == audit_pid) { |
ee1d3156 | 2572 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
175fc484 | 2573 | audit_sig_pid = tsk->pid; |
e1760bd5 | 2574 | if (uid_valid(tsk->loginuid)) |
bfef93a5 | 2575 | audit_sig_uid = tsk->loginuid; |
175fc484 | 2576 | else |
c69e8d9c | 2577 | audit_sig_uid = uid; |
2a862b32 | 2578 | security_task_getsecid(tsk, &audit_sig_sid); |
175fc484 AV |
2579 | } |
2580 | if (!audit_signals || audit_dummy_context()) | |
2581 | return 0; | |
c2f0c7c3 | 2582 | } |
e54dc243 | 2583 | |
e54dc243 AG |
2584 | /* optimize the common case by putting first signal recipient directly |
2585 | * in audit_context */ | |
2586 | if (!ctx->target_pid) { | |
2587 | ctx->target_pid = t->tgid; | |
c2a7780e | 2588 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2589 | ctx->target_uid = t_uid; |
4746ec5b | 2590 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2591 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2592 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2593 | return 0; |
2594 | } | |
2595 | ||
2596 | axp = (void *)ctx->aux_pids; | |
2597 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2598 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2599 | if (!axp) | |
2600 | return -ENOMEM; | |
2601 | ||
2602 | axp->d.type = AUDIT_OBJ_PID; | |
2603 | axp->d.next = ctx->aux_pids; | |
2604 | ctx->aux_pids = (void *)axp; | |
2605 | } | |
88ae704c | 2606 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2607 | |
2608 | axp->target_pid[axp->pid_count] = t->tgid; | |
c2a7780e | 2609 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2610 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2611 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2612 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2613 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2614 | axp->pid_count++; |
2615 | ||
2616 | return 0; | |
c2f0c7c3 | 2617 | } |
0a4ff8c2 | 2618 | |
3fc689e9 EP |
2619 | /** |
2620 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2621 | * @bprm: pointer to the bprm being processed |
2622 | * @new: the proposed new credentials | |
2623 | * @old: the old credentials | |
3fc689e9 EP |
2624 | * |
2625 | * Simply check if the proc already has the caps given by the file and if not | |
2626 | * store the priv escalation info for later auditing at the end of the syscall | |
2627 | * | |
3fc689e9 EP |
2628 | * -Eric |
2629 | */ | |
d84f4f99 DH |
2630 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2631 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2632 | { |
2633 | struct audit_aux_data_bprm_fcaps *ax; | |
2634 | struct audit_context *context = current->audit_context; | |
2635 | struct cpu_vfs_cap_data vcaps; | |
2636 | struct dentry *dentry; | |
2637 | ||
2638 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2639 | if (!ax) | |
d84f4f99 | 2640 | return -ENOMEM; |
3fc689e9 EP |
2641 | |
2642 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2643 | ax->d.next = context->aux; | |
2644 | context->aux = (void *)ax; | |
2645 | ||
2646 | dentry = dget(bprm->file->f_dentry); | |
2647 | get_vfs_caps_from_disk(dentry, &vcaps); | |
2648 | dput(dentry); | |
2649 | ||
2650 | ax->fcap.permitted = vcaps.permitted; | |
2651 | ax->fcap.inheritable = vcaps.inheritable; | |
2652 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2653 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2654 | ||
d84f4f99 DH |
2655 | ax->old_pcap.permitted = old->cap_permitted; |
2656 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2657 | ax->old_pcap.effective = old->cap_effective; | |
3fc689e9 | 2658 | |
d84f4f99 DH |
2659 | ax->new_pcap.permitted = new->cap_permitted; |
2660 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2661 | ax->new_pcap.effective = new->cap_effective; | |
2662 | return 0; | |
3fc689e9 EP |
2663 | } |
2664 | ||
e68b75a0 EP |
2665 | /** |
2666 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2667 | * @pid: target pid of the capset call |
2668 | * @new: the new credentials | |
2669 | * @old: the old (current) credentials | |
e68b75a0 EP |
2670 | * |
2671 | * Record the aguments userspace sent to sys_capset for later printing by the | |
2672 | * audit system if applicable | |
2673 | */ | |
57f71a0a | 2674 | void __audit_log_capset(pid_t pid, |
d84f4f99 | 2675 | const struct cred *new, const struct cred *old) |
e68b75a0 | 2676 | { |
e68b75a0 | 2677 | struct audit_context *context = current->audit_context; |
57f71a0a AV |
2678 | context->capset.pid = pid; |
2679 | context->capset.cap.effective = new->cap_effective; | |
2680 | context->capset.cap.inheritable = new->cap_effective; | |
2681 | context->capset.cap.permitted = new->cap_permitted; | |
2682 | context->type = AUDIT_CAPSET; | |
e68b75a0 EP |
2683 | } |
2684 | ||
120a795d AV |
2685 | void __audit_mmap_fd(int fd, int flags) |
2686 | { | |
2687 | struct audit_context *context = current->audit_context; | |
2688 | context->mmap.fd = fd; | |
2689 | context->mmap.flags = flags; | |
2690 | context->type = AUDIT_MMAP; | |
2691 | } | |
2692 | ||
7b9205bd | 2693 | static void audit_log_task(struct audit_buffer *ab) |
85e7bac3 | 2694 | { |
cca080d9 EB |
2695 | kuid_t auid, uid; |
2696 | kgid_t gid; | |
85e7bac3 EP |
2697 | unsigned int sessionid; |
2698 | ||
2699 | auid = audit_get_loginuid(current); | |
2700 | sessionid = audit_get_sessionid(current); | |
2701 | current_uid_gid(&uid, &gid); | |
2702 | ||
2703 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2704 | from_kuid(&init_user_ns, auid), |
2705 | from_kuid(&init_user_ns, uid), | |
2706 | from_kgid(&init_user_ns, gid), | |
2707 | sessionid); | |
85e7bac3 EP |
2708 | audit_log_task_context(ab); |
2709 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2710 | audit_log_untrustedstring(ab, current->comm); | |
7b9205bd KC |
2711 | } |
2712 | ||
2713 | static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr) | |
2714 | { | |
2715 | audit_log_task(ab); | |
85e7bac3 EP |
2716 | audit_log_format(ab, " reason="); |
2717 | audit_log_string(ab, reason); | |
2718 | audit_log_format(ab, " sig=%ld", signr); | |
2719 | } | |
0a4ff8c2 SG |
2720 | /** |
2721 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2722 | * @signr: signal value |
0a4ff8c2 SG |
2723 | * |
2724 | * If a process ends with a core dump, something fishy is going on and we | |
2725 | * should record the event for investigation. | |
2726 | */ | |
2727 | void audit_core_dumps(long signr) | |
2728 | { | |
2729 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2730 | |
2731 | if (!audit_enabled) | |
2732 | return; | |
2733 | ||
2734 | if (signr == SIGQUIT) /* don't care for those */ | |
2735 | return; | |
2736 | ||
2737 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
0644ec0c KC |
2738 | if (unlikely(!ab)) |
2739 | return; | |
85e7bac3 EP |
2740 | audit_log_abend(ab, "memory violation", signr); |
2741 | audit_log_end(ab); | |
2742 | } | |
0a4ff8c2 | 2743 | |
3dc1c1b2 | 2744 | void __audit_seccomp(unsigned long syscall, long signr, int code) |
85e7bac3 EP |
2745 | { |
2746 | struct audit_buffer *ab; | |
2747 | ||
7b9205bd KC |
2748 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP); |
2749 | if (unlikely(!ab)) | |
2750 | return; | |
2751 | audit_log_task(ab); | |
2752 | audit_log_format(ab, " sig=%ld", signr); | |
85e7bac3 | 2753 | audit_log_format(ab, " syscall=%ld", syscall); |
3dc1c1b2 KC |
2754 | audit_log_format(ab, " compat=%d", is_compat_task()); |
2755 | audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current)); | |
2756 | audit_log_format(ab, " code=0x%x", code); | |
0a4ff8c2 SG |
2757 | audit_log_end(ab); |
2758 | } | |
916d7576 AV |
2759 | |
2760 | struct list_head *audit_killed_trees(void) | |
2761 | { | |
2762 | struct audit_context *ctx = current->audit_context; | |
2763 | if (likely(!ctx || !ctx->in_syscall)) | |
2764 | return NULL; | |
2765 | return &ctx->killed_trees; | |
2766 | } |