Commit | Line | Data |
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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
20ca73bc | 6 | * Copyright (C) 2005, 2006 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
20ca73bc GW |
32 | * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>, |
33 | * 2006. | |
34 | * | |
b63862f4 DK |
35 | * The support of additional filter rules compares (>, <, >=, <=) was |
36 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
37 | * | |
73241ccc AG |
38 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
39 | * filesystem information. | |
8c8570fb DK |
40 | * |
41 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
42 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
43 | */ |
44 | ||
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 | * | |
106 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
107 | struct audit_names { | |
5195d8e2 | 108 | struct list_head list; /* audit_context->names_list */ |
1da177e4 LT |
109 | const char *name; |
110 | unsigned long ino; | |
111 | dev_t dev; | |
112 | umode_t mode; | |
ca57ec0f EB |
113 | kuid_t uid; |
114 | kgid_t gid; | |
1da177e4 | 115 | dev_t rdev; |
1b50eed9 | 116 | u32 osid; |
851f7ff5 EP |
117 | struct audit_cap_data fcap; |
118 | unsigned int fcap_ver; | |
5195d8e2 | 119 | int name_len; /* number of name's characters to log */ |
78e2e802 | 120 | unsigned char type; /* record type */ |
5195d8e2 EP |
121 | bool name_put; /* call __putname() for this name */ |
122 | /* | |
123 | * This was an allocated audit_names and not from the array of | |
124 | * names allocated in the task audit context. Thus this name | |
125 | * should be freed on syscall exit | |
126 | */ | |
127 | bool should_free; | |
1da177e4 LT |
128 | }; |
129 | ||
130 | struct audit_aux_data { | |
131 | struct audit_aux_data *next; | |
132 | int type; | |
133 | }; | |
134 | ||
135 | #define AUDIT_AUX_IPCPERM 0 | |
136 | ||
e54dc243 AG |
137 | /* Number of target pids per aux struct. */ |
138 | #define AUDIT_AUX_PIDS 16 | |
139 | ||
473ae30b AV |
140 | struct audit_aux_data_execve { |
141 | struct audit_aux_data d; | |
142 | int argc; | |
143 | int envc; | |
bdf4c48a | 144 | struct mm_struct *mm; |
473ae30b AV |
145 | }; |
146 | ||
e54dc243 AG |
147 | struct audit_aux_data_pids { |
148 | struct audit_aux_data d; | |
149 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
e1760bd5 | 150 | kuid_t target_auid[AUDIT_AUX_PIDS]; |
cca080d9 | 151 | kuid_t target_uid[AUDIT_AUX_PIDS]; |
4746ec5b | 152 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 153 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 154 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
155 | int pid_count; |
156 | }; | |
157 | ||
3fc689e9 EP |
158 | struct audit_aux_data_bprm_fcaps { |
159 | struct audit_aux_data d; | |
160 | struct audit_cap_data fcap; | |
161 | unsigned int fcap_ver; | |
162 | struct audit_cap_data old_pcap; | |
163 | struct audit_cap_data new_pcap; | |
164 | }; | |
165 | ||
e68b75a0 EP |
166 | struct audit_aux_data_capset { |
167 | struct audit_aux_data d; | |
168 | pid_t pid; | |
169 | struct audit_cap_data cap; | |
170 | }; | |
171 | ||
74c3cbe3 AV |
172 | struct audit_tree_refs { |
173 | struct audit_tree_refs *next; | |
174 | struct audit_chunk *c[31]; | |
175 | }; | |
176 | ||
1da177e4 LT |
177 | /* The per-task audit context. */ |
178 | struct audit_context { | |
d51374ad | 179 | int dummy; /* must be the first element */ |
1da177e4 | 180 | int in_syscall; /* 1 if task is in a syscall */ |
0590b933 | 181 | enum audit_state state, current_state; |
1da177e4 | 182 | unsigned int serial; /* serial number for record */ |
1da177e4 | 183 | int major; /* syscall number */ |
44e51a1b | 184 | struct timespec ctime; /* time of syscall entry */ |
1da177e4 | 185 | unsigned long argv[4]; /* syscall arguments */ |
2fd6f58b | 186 | long return_code;/* syscall return code */ |
0590b933 | 187 | u64 prio; |
44e51a1b | 188 | int return_valid; /* return code is valid */ |
5195d8e2 EP |
189 | /* |
190 | * The names_list is the list of all audit_names collected during this | |
191 | * syscall. The first AUDIT_NAMES entries in the names_list will | |
192 | * actually be from the preallocated_names array for performance | |
193 | * reasons. Except during allocation they should never be referenced | |
194 | * through the preallocated_names array and should only be found/used | |
195 | * by running the names_list. | |
196 | */ | |
197 | struct audit_names preallocated_names[AUDIT_NAMES]; | |
198 | int name_count; /* total records in names_list */ | |
199 | struct list_head names_list; /* anchor for struct audit_names->list */ | |
5adc8a6a | 200 | char * filterkey; /* key for rule that triggered record */ |
44707fdf | 201 | struct path pwd; |
1da177e4 LT |
202 | struct audit_context *previous; /* For nested syscalls */ |
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; | |
229 | long args[6]; | |
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); |
1da177e4 LT |
636 | break; |
637 | case AUDIT_EGID: | |
ca57ec0f | 638 | result = audit_gid_comparator(cred->egid, f->op, f->gid); |
1da177e4 LT |
639 | break; |
640 | case AUDIT_SGID: | |
ca57ec0f | 641 | result = audit_gid_comparator(cred->sgid, f->op, f->gid); |
1da177e4 LT |
642 | break; |
643 | case AUDIT_FSGID: | |
ca57ec0f | 644 | result = audit_gid_comparator(cred->fsgid, f->op, f->gid); |
1da177e4 LT |
645 | break; |
646 | case AUDIT_PERS: | |
93315ed6 | 647 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 648 | break; |
2fd6f58b | 649 | case AUDIT_ARCH: |
9f8dbe9c | 650 | if (ctx) |
93315ed6 | 651 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 652 | break; |
1da177e4 LT |
653 | |
654 | case AUDIT_EXIT: | |
655 | if (ctx && ctx->return_valid) | |
93315ed6 | 656 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
657 | break; |
658 | case AUDIT_SUCCESS: | |
b01f2cc1 | 659 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
660 | if (f->val) |
661 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 662 | else |
93315ed6 | 663 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 664 | } |
1da177e4 LT |
665 | break; |
666 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
667 | if (name) { |
668 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
669 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
670 | ++result; | |
671 | } else if (ctx) { | |
5195d8e2 | 672 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
673 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
674 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
675 | ++result; |
676 | break; | |
677 | } | |
678 | } | |
679 | } | |
680 | break; | |
681 | case AUDIT_DEVMINOR: | |
16c174bd EP |
682 | if (name) { |
683 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
684 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
685 | ++result; | |
686 | } else if (ctx) { | |
5195d8e2 | 687 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
688 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
689 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
690 | ++result; |
691 | break; | |
692 | } | |
693 | } | |
694 | } | |
695 | break; | |
696 | case AUDIT_INODE: | |
f368c07d | 697 | if (name) |
9c937dcc | 698 | result = (name->ino == f->val); |
f368c07d | 699 | else if (ctx) { |
5195d8e2 EP |
700 | list_for_each_entry(n, &ctx->names_list, list) { |
701 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
702 | ++result; |
703 | break; | |
704 | } | |
705 | } | |
706 | } | |
707 | break; | |
efaffd6e EP |
708 | case AUDIT_OBJ_UID: |
709 | if (name) { | |
ca57ec0f | 710 | result = audit_uid_comparator(name->uid, f->op, f->uid); |
efaffd6e EP |
711 | } else if (ctx) { |
712 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 713 | if (audit_uid_comparator(n->uid, f->op, f->uid)) { |
efaffd6e EP |
714 | ++result; |
715 | break; | |
716 | } | |
717 | } | |
718 | } | |
719 | break; | |
54d3218b EP |
720 | case AUDIT_OBJ_GID: |
721 | if (name) { | |
ca57ec0f | 722 | result = audit_gid_comparator(name->gid, f->op, f->gid); |
54d3218b EP |
723 | } else if (ctx) { |
724 | list_for_each_entry(n, &ctx->names_list, list) { | |
ca57ec0f | 725 | if (audit_gid_comparator(n->gid, f->op, f->gid)) { |
54d3218b EP |
726 | ++result; |
727 | break; | |
728 | } | |
729 | } | |
730 | } | |
731 | break; | |
f368c07d | 732 | case AUDIT_WATCH: |
ae7b8f41 EP |
733 | if (name) |
734 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 735 | break; |
74c3cbe3 AV |
736 | case AUDIT_DIR: |
737 | if (ctx) | |
738 | result = match_tree_refs(ctx, rule->tree); | |
739 | break; | |
1da177e4 LT |
740 | case AUDIT_LOGINUID: |
741 | result = 0; | |
742 | if (ctx) | |
ca57ec0f | 743 | result = audit_uid_comparator(tsk->loginuid, f->op, f->uid); |
1da177e4 | 744 | break; |
3a6b9f85 DG |
745 | case AUDIT_SUBJ_USER: |
746 | case AUDIT_SUBJ_ROLE: | |
747 | case AUDIT_SUBJ_TYPE: | |
748 | case AUDIT_SUBJ_SEN: | |
749 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
750 | /* NOTE: this may return negative values indicating |
751 | a temporary error. We simply treat this as a | |
752 | match for now to avoid losing information that | |
753 | may be wanted. An error message will also be | |
754 | logged upon error */ | |
04305e4a | 755 | if (f->lsm_rule) { |
2ad312d2 | 756 | if (need_sid) { |
2a862b32 | 757 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
758 | need_sid = 0; |
759 | } | |
d7a96f3a | 760 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 761 | f->op, |
04305e4a | 762 | f->lsm_rule, |
3dc7e315 | 763 | ctx); |
2ad312d2 | 764 | } |
3dc7e315 | 765 | break; |
6e5a2d1d DG |
766 | case AUDIT_OBJ_USER: |
767 | case AUDIT_OBJ_ROLE: | |
768 | case AUDIT_OBJ_TYPE: | |
769 | case AUDIT_OBJ_LEV_LOW: | |
770 | case AUDIT_OBJ_LEV_HIGH: | |
771 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
772 | also applies here */ | |
04305e4a | 773 | if (f->lsm_rule) { |
6e5a2d1d DG |
774 | /* Find files that match */ |
775 | if (name) { | |
d7a96f3a | 776 | result = security_audit_rule_match( |
6e5a2d1d | 777 | name->osid, f->type, f->op, |
04305e4a | 778 | f->lsm_rule, ctx); |
6e5a2d1d | 779 | } else if (ctx) { |
5195d8e2 EP |
780 | list_for_each_entry(n, &ctx->names_list, list) { |
781 | if (security_audit_rule_match(n->osid, f->type, | |
782 | f->op, f->lsm_rule, | |
783 | ctx)) { | |
6e5a2d1d DG |
784 | ++result; |
785 | break; | |
786 | } | |
787 | } | |
788 | } | |
789 | /* Find ipc objects that match */ | |
a33e6751 AV |
790 | if (!ctx || ctx->type != AUDIT_IPC) |
791 | break; | |
792 | if (security_audit_rule_match(ctx->ipc.osid, | |
793 | f->type, f->op, | |
794 | f->lsm_rule, ctx)) | |
795 | ++result; | |
6e5a2d1d DG |
796 | } |
797 | break; | |
1da177e4 LT |
798 | case AUDIT_ARG0: |
799 | case AUDIT_ARG1: | |
800 | case AUDIT_ARG2: | |
801 | case AUDIT_ARG3: | |
802 | if (ctx) | |
93315ed6 | 803 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 804 | break; |
5adc8a6a AG |
805 | case AUDIT_FILTERKEY: |
806 | /* ignore this field for filtering */ | |
807 | result = 1; | |
808 | break; | |
55669bfa AV |
809 | case AUDIT_PERM: |
810 | result = audit_match_perm(ctx, f->val); | |
811 | break; | |
8b67dca9 AV |
812 | case AUDIT_FILETYPE: |
813 | result = audit_match_filetype(ctx, f->val); | |
814 | break; | |
02d86a56 EP |
815 | case AUDIT_FIELD_COMPARE: |
816 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
817 | break; | |
1da177e4 | 818 | } |
f5629883 | 819 | if (!result) |
1da177e4 LT |
820 | return 0; |
821 | } | |
0590b933 AV |
822 | |
823 | if (ctx) { | |
824 | if (rule->prio <= ctx->prio) | |
825 | return 0; | |
826 | if (rule->filterkey) { | |
827 | kfree(ctx->filterkey); | |
828 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
829 | } | |
830 | ctx->prio = rule->prio; | |
831 | } | |
1da177e4 LT |
832 | switch (rule->action) { |
833 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
834 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
835 | } | |
836 | return 1; | |
837 | } | |
838 | ||
839 | /* At process creation time, we can determine if system-call auditing is | |
840 | * completely disabled for this task. Since we only have the task | |
841 | * structure at this point, we can only check uid and gid. | |
842 | */ | |
e048e02c | 843 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
844 | { |
845 | struct audit_entry *e; | |
846 | enum audit_state state; | |
847 | ||
848 | rcu_read_lock(); | |
0f45aa18 | 849 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
850 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
851 | &state, true)) { | |
e048e02c AV |
852 | if (state == AUDIT_RECORD_CONTEXT) |
853 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
854 | rcu_read_unlock(); |
855 | return state; | |
856 | } | |
857 | } | |
858 | rcu_read_unlock(); | |
859 | return AUDIT_BUILD_CONTEXT; | |
860 | } | |
861 | ||
862 | /* At syscall entry and exit time, this filter is called if the | |
863 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 864 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 865 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
866 | */ |
867 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
868 | struct audit_context *ctx, | |
869 | struct list_head *list) | |
870 | { | |
871 | struct audit_entry *e; | |
c3896495 | 872 | enum audit_state state; |
1da177e4 | 873 | |
351bb722 | 874 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
875 | return AUDIT_DISABLED; |
876 | ||
1da177e4 | 877 | rcu_read_lock(); |
c3896495 | 878 | if (!list_empty(list)) { |
b63862f4 DK |
879 | int word = AUDIT_WORD(ctx->major); |
880 | int bit = AUDIT_BIT(ctx->major); | |
881 | ||
882 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
883 | if ((e->rule.mask[word] & bit) == bit && |
884 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
f5629883 | 885 | &state, false)) { |
f368c07d | 886 | rcu_read_unlock(); |
0590b933 | 887 | ctx->current_state = state; |
f368c07d AG |
888 | return state; |
889 | } | |
890 | } | |
891 | } | |
892 | rcu_read_unlock(); | |
893 | return AUDIT_BUILD_CONTEXT; | |
894 | } | |
895 | ||
5195d8e2 EP |
896 | /* |
897 | * Given an audit_name check the inode hash table to see if they match. | |
898 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
899 | */ | |
900 | static int audit_filter_inode_name(struct task_struct *tsk, | |
901 | struct audit_names *n, | |
902 | struct audit_context *ctx) { | |
903 | int word, bit; | |
904 | int h = audit_hash_ino((u32)n->ino); | |
905 | struct list_head *list = &audit_inode_hash[h]; | |
906 | struct audit_entry *e; | |
907 | enum audit_state state; | |
908 | ||
909 | word = AUDIT_WORD(ctx->major); | |
910 | bit = AUDIT_BIT(ctx->major); | |
911 | ||
912 | if (list_empty(list)) | |
913 | return 0; | |
914 | ||
915 | list_for_each_entry_rcu(e, list, list) { | |
916 | if ((e->rule.mask[word] & bit) == bit && | |
917 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { | |
918 | ctx->current_state = state; | |
919 | return 1; | |
920 | } | |
921 | } | |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
926 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 927 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 928 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
929 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
930 | */ | |
0590b933 | 931 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 932 | { |
5195d8e2 | 933 | struct audit_names *n; |
f368c07d AG |
934 | |
935 | if (audit_pid && tsk->tgid == audit_pid) | |
0590b933 | 936 | return; |
f368c07d AG |
937 | |
938 | rcu_read_lock(); | |
f368c07d | 939 | |
5195d8e2 EP |
940 | list_for_each_entry(n, &ctx->names_list, list) { |
941 | if (audit_filter_inode_name(tsk, n, ctx)) | |
942 | break; | |
0f45aa18 DW |
943 | } |
944 | rcu_read_unlock(); | |
0f45aa18 DW |
945 | } |
946 | ||
1da177e4 LT |
947 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
948 | int return_valid, | |
6d208da8 | 949 | long return_code) |
1da177e4 LT |
950 | { |
951 | struct audit_context *context = tsk->audit_context; | |
952 | ||
56179a6e | 953 | if (!context) |
1da177e4 LT |
954 | return NULL; |
955 | context->return_valid = return_valid; | |
f701b75e EP |
956 | |
957 | /* | |
958 | * we need to fix up the return code in the audit logs if the actual | |
959 | * return codes are later going to be fixed up by the arch specific | |
960 | * signal handlers | |
961 | * | |
962 | * This is actually a test for: | |
963 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
964 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
965 | * | |
966 | * but is faster than a bunch of || | |
967 | */ | |
968 | if (unlikely(return_code <= -ERESTARTSYS) && | |
969 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
970 | (return_code != -ENOIOCTLCMD)) | |
971 | context->return_code = -EINTR; | |
972 | else | |
973 | context->return_code = return_code; | |
1da177e4 | 974 | |
0590b933 AV |
975 | if (context->in_syscall && !context->dummy) { |
976 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
977 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
978 | } |
979 | ||
1da177e4 LT |
980 | tsk->audit_context = NULL; |
981 | return context; | |
982 | } | |
983 | ||
984 | static inline void audit_free_names(struct audit_context *context) | |
985 | { | |
5195d8e2 | 986 | struct audit_names *n, *next; |
1da177e4 LT |
987 | |
988 | #if AUDIT_DEBUG == 2 | |
0590b933 | 989 | if (context->put_count + context->ino_count != context->name_count) { |
73241ccc | 990 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
991 | " name_count=%d put_count=%d" |
992 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 993 | __FILE__, __LINE__, |
1da177e4 LT |
994 | context->serial, context->major, context->in_syscall, |
995 | context->name_count, context->put_count, | |
996 | context->ino_count); | |
5195d8e2 | 997 | list_for_each_entry(n, &context->names_list, list) { |
1da177e4 | 998 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
5195d8e2 | 999 | n->name, n->name ?: "(null)"); |
8c8570fb | 1000 | } |
1da177e4 LT |
1001 | dump_stack(); |
1002 | return; | |
1003 | } | |
1004 | #endif | |
1005 | #if AUDIT_DEBUG | |
1006 | context->put_count = 0; | |
1007 | context->ino_count = 0; | |
1008 | #endif | |
1009 | ||
5195d8e2 EP |
1010 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
1011 | list_del(&n->list); | |
1012 | if (n->name && n->name_put) | |
1013 | __putname(n->name); | |
1014 | if (n->should_free) | |
1015 | kfree(n); | |
8c8570fb | 1016 | } |
1da177e4 | 1017 | context->name_count = 0; |
44707fdf JB |
1018 | path_put(&context->pwd); |
1019 | context->pwd.dentry = NULL; | |
1020 | context->pwd.mnt = NULL; | |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | static inline void audit_free_aux(struct audit_context *context) | |
1024 | { | |
1025 | struct audit_aux_data *aux; | |
1026 | ||
1027 | while ((aux = context->aux)) { | |
1028 | context->aux = aux->next; | |
1029 | kfree(aux); | |
1030 | } | |
e54dc243 AG |
1031 | while ((aux = context->aux_pids)) { |
1032 | context->aux_pids = aux->next; | |
1033 | kfree(aux); | |
1034 | } | |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | static inline void audit_zero_context(struct audit_context *context, | |
1038 | enum audit_state state) | |
1039 | { | |
1da177e4 LT |
1040 | memset(context, 0, sizeof(*context)); |
1041 | context->state = state; | |
0590b933 | 1042 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
1046 | { | |
1047 | struct audit_context *context; | |
1048 | ||
1049 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
1050 | return NULL; | |
1051 | audit_zero_context(context, state); | |
916d7576 | 1052 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 1053 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
1054 | return context; |
1055 | } | |
1056 | ||
b0dd25a8 RD |
1057 | /** |
1058 | * audit_alloc - allocate an audit context block for a task | |
1059 | * @tsk: task | |
1060 | * | |
1061 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
1062 | * if necessary. Doing so turns on system call auditing for the |
1063 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
1064 | * needed. |
1065 | */ | |
1da177e4 LT |
1066 | int audit_alloc(struct task_struct *tsk) |
1067 | { | |
1068 | struct audit_context *context; | |
1069 | enum audit_state state; | |
e048e02c | 1070 | char *key = NULL; |
1da177e4 | 1071 | |
b593d384 | 1072 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
1073 | return 0; /* Return if not auditing. */ |
1074 | ||
e048e02c | 1075 | state = audit_filter_task(tsk, &key); |
56179a6e | 1076 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1077 | return 0; |
1078 | ||
1079 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 1080 | kfree(key); |
1da177e4 LT |
1081 | audit_log_lost("out of memory in audit_alloc"); |
1082 | return -ENOMEM; | |
1083 | } | |
e048e02c | 1084 | context->filterkey = key; |
1da177e4 | 1085 | |
1da177e4 LT |
1086 | tsk->audit_context = context; |
1087 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | static inline void audit_free_context(struct audit_context *context) | |
1092 | { | |
1093 | struct audit_context *previous; | |
1094 | int count = 0; | |
1095 | ||
1096 | do { | |
1097 | previous = context->previous; | |
1098 | if (previous || (count && count < 10)) { | |
1099 | ++count; | |
1100 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
1101 | " freeing multiple contexts (%d)\n", | |
1102 | context->serial, context->major, | |
1103 | context->name_count, count); | |
1104 | } | |
1105 | audit_free_names(context); | |
74c3cbe3 AV |
1106 | unroll_tree_refs(context, NULL, 0); |
1107 | free_tree_refs(context); | |
1da177e4 | 1108 | audit_free_aux(context); |
5adc8a6a | 1109 | kfree(context->filterkey); |
4f6b434f | 1110 | kfree(context->sockaddr); |
1da177e4 LT |
1111 | kfree(context); |
1112 | context = previous; | |
1113 | } while (context); | |
1114 | if (count >= 10) | |
1115 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
1116 | } | |
1117 | ||
161a09e7 | 1118 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
1119 | { |
1120 | char *ctx = NULL; | |
c4823bce AV |
1121 | unsigned len; |
1122 | int error; | |
1123 | u32 sid; | |
1124 | ||
2a862b32 | 1125 | security_task_getsecid(current, &sid); |
c4823bce AV |
1126 | if (!sid) |
1127 | return; | |
8c8570fb | 1128 | |
2a862b32 | 1129 | error = security_secid_to_secctx(sid, &ctx, &len); |
c4823bce AV |
1130 | if (error) { |
1131 | if (error != -EINVAL) | |
8c8570fb DK |
1132 | goto error_path; |
1133 | return; | |
1134 | } | |
1135 | ||
8c8570fb | 1136 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 | 1137 | security_release_secctx(ctx, len); |
7306a0b9 | 1138 | return; |
8c8570fb DK |
1139 | |
1140 | error_path: | |
7306a0b9 | 1141 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
1142 | return; |
1143 | } | |
1144 | ||
161a09e7 JL |
1145 | EXPORT_SYMBOL(audit_log_task_context); |
1146 | ||
e23eb920 | 1147 | void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 1148 | { |
e23eb920 | 1149 | const struct cred *cred; |
45d9bb0e AV |
1150 | char name[sizeof(tsk->comm)]; |
1151 | struct mm_struct *mm = tsk->mm; | |
e23eb920 PM |
1152 | char *tty; |
1153 | ||
1154 | if (!ab) | |
1155 | return; | |
219f0817 | 1156 | |
e495149b | 1157 | /* tsk == current */ |
e23eb920 PM |
1158 | cred = current_cred(); |
1159 | ||
1160 | spin_lock_irq(&tsk->sighand->siglock); | |
1161 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) | |
1162 | tty = tsk->signal->tty->name; | |
1163 | else | |
1164 | tty = "(none)"; | |
1165 | spin_unlock_irq(&tsk->sighand->siglock); | |
1166 | ||
1167 | ||
1168 | audit_log_format(ab, | |
1169 | " ppid=%ld pid=%d auid=%u uid=%u gid=%u" | |
1170 | " euid=%u suid=%u fsuid=%u" | |
1171 | " egid=%u sgid=%u fsgid=%u ses=%u tty=%s", | |
1172 | sys_getppid(), | |
1173 | tsk->pid, | |
88265322 LT |
1174 | from_kuid(&init_user_ns, tsk->loginuid), |
1175 | from_kuid(&init_user_ns, cred->uid), | |
1176 | from_kgid(&init_user_ns, cred->gid), | |
1177 | from_kuid(&init_user_ns, cred->euid), | |
1178 | from_kuid(&init_user_ns, cred->suid), | |
1179 | from_kuid(&init_user_ns, cred->fsuid), | |
1180 | from_kgid(&init_user_ns, cred->egid), | |
1181 | from_kgid(&init_user_ns, cred->sgid), | |
1182 | from_kgid(&init_user_ns, cred->fsgid), | |
e23eb920 | 1183 | tsk->sessionid, tty); |
e495149b | 1184 | |
45d9bb0e | 1185 | get_task_comm(name, tsk); |
99e45eea DW |
1186 | audit_log_format(ab, " comm="); |
1187 | audit_log_untrustedstring(ab, name); | |
219f0817 | 1188 | |
e495149b AV |
1189 | if (mm) { |
1190 | down_read(&mm->mmap_sem); | |
2dd8ad81 KK |
1191 | if (mm->exe_file) |
1192 | audit_log_d_path(ab, " exe=", &mm->exe_file->f_path); | |
e495149b | 1193 | up_read(&mm->mmap_sem); |
219f0817 | 1194 | } |
e495149b | 1195 | audit_log_task_context(ab); |
219f0817 SS |
1196 | } |
1197 | ||
e23eb920 PM |
1198 | EXPORT_SYMBOL(audit_log_task_info); |
1199 | ||
e54dc243 | 1200 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
cca080d9 | 1201 | kuid_t auid, kuid_t uid, unsigned int sessionid, |
4746ec5b | 1202 | u32 sid, char *comm) |
e54dc243 AG |
1203 | { |
1204 | struct audit_buffer *ab; | |
2a862b32 | 1205 | char *ctx = NULL; |
e54dc243 AG |
1206 | u32 len; |
1207 | int rc = 0; | |
1208 | ||
1209 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
1210 | if (!ab) | |
6246ccab | 1211 | return rc; |
e54dc243 | 1212 | |
e1760bd5 EB |
1213 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, |
1214 | from_kuid(&init_user_ns, auid), | |
cca080d9 | 1215 | from_kuid(&init_user_ns, uid), sessionid); |
2a862b32 | 1216 | if (security_secid_to_secctx(sid, &ctx, &len)) { |
c2a7780e | 1217 | audit_log_format(ab, " obj=(none)"); |
e54dc243 | 1218 | rc = 1; |
2a862b32 AD |
1219 | } else { |
1220 | audit_log_format(ab, " obj=%s", ctx); | |
1221 | security_release_secctx(ctx, len); | |
1222 | } | |
c2a7780e EP |
1223 | audit_log_format(ab, " ocomm="); |
1224 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1225 | audit_log_end(ab); |
e54dc243 AG |
1226 | |
1227 | return rc; | |
1228 | } | |
1229 | ||
de6bbd1d EP |
1230 | /* |
1231 | * to_send and len_sent accounting are very loose estimates. We aren't | |
1232 | * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being | |
25985edc | 1233 | * within about 500 bytes (next page boundary) |
de6bbd1d EP |
1234 | * |
1235 | * why snprintf? an int is up to 12 digits long. if we just assumed when | |
1236 | * logging that a[%d]= was going to be 16 characters long we would be wasting | |
1237 | * space in every audit message. In one 7500 byte message we can log up to | |
1238 | * about 1000 min size arguments. That comes down to about 50% waste of space | |
1239 | * if we didn't do the snprintf to find out how long arg_num_len was. | |
1240 | */ | |
1241 | static int audit_log_single_execve_arg(struct audit_context *context, | |
1242 | struct audit_buffer **ab, | |
1243 | int arg_num, | |
1244 | size_t *len_sent, | |
1245 | const char __user *p, | |
1246 | char *buf) | |
bdf4c48a | 1247 | { |
de6bbd1d EP |
1248 | char arg_num_len_buf[12]; |
1249 | const char __user *tmp_p = p; | |
b87ce6e4 EP |
1250 | /* how many digits are in arg_num? 5 is the length of ' a=""' */ |
1251 | size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5; | |
de6bbd1d EP |
1252 | size_t len, len_left, to_send; |
1253 | size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; | |
1254 | unsigned int i, has_cntl = 0, too_long = 0; | |
1255 | int ret; | |
1256 | ||
1257 | /* strnlen_user includes the null we don't want to send */ | |
1258 | len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
bdf4c48a | 1259 | |
de6bbd1d EP |
1260 | /* |
1261 | * We just created this mm, if we can't find the strings | |
1262 | * we just copied into it something is _very_ wrong. Similar | |
1263 | * for strings that are too long, we should not have created | |
1264 | * any. | |
1265 | */ | |
b0abcfc1 | 1266 | if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) { |
de6bbd1d EP |
1267 | WARN_ON(1); |
1268 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1269 | return -1; |
de6bbd1d | 1270 | } |
040b3a2d | 1271 | |
de6bbd1d EP |
1272 | /* walk the whole argument looking for non-ascii chars */ |
1273 | do { | |
1274 | if (len_left > MAX_EXECVE_AUDIT_LEN) | |
1275 | to_send = MAX_EXECVE_AUDIT_LEN; | |
1276 | else | |
1277 | to_send = len_left; | |
1278 | ret = copy_from_user(buf, tmp_p, to_send); | |
bdf4c48a | 1279 | /* |
de6bbd1d EP |
1280 | * There is no reason for this copy to be short. We just |
1281 | * copied them here, and the mm hasn't been exposed to user- | |
1282 | * space yet. | |
bdf4c48a | 1283 | */ |
de6bbd1d | 1284 | if (ret) { |
bdf4c48a PZ |
1285 | WARN_ON(1); |
1286 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1287 | return -1; |
bdf4c48a | 1288 | } |
de6bbd1d EP |
1289 | buf[to_send] = '\0'; |
1290 | has_cntl = audit_string_contains_control(buf, to_send); | |
1291 | if (has_cntl) { | |
1292 | /* | |
1293 | * hex messages get logged as 2 bytes, so we can only | |
1294 | * send half as much in each message | |
1295 | */ | |
1296 | max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2; | |
bdf4c48a PZ |
1297 | break; |
1298 | } | |
de6bbd1d EP |
1299 | len_left -= to_send; |
1300 | tmp_p += to_send; | |
1301 | } while (len_left > 0); | |
1302 | ||
1303 | len_left = len; | |
1304 | ||
1305 | if (len > max_execve_audit_len) | |
1306 | too_long = 1; | |
1307 | ||
1308 | /* rewalk the argument actually logging the message */ | |
1309 | for (i = 0; len_left > 0; i++) { | |
1310 | int room_left; | |
1311 | ||
1312 | if (len_left > max_execve_audit_len) | |
1313 | to_send = max_execve_audit_len; | |
1314 | else | |
1315 | to_send = len_left; | |
1316 | ||
1317 | /* do we have space left to send this argument in this ab? */ | |
1318 | room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent; | |
1319 | if (has_cntl) | |
1320 | room_left -= (to_send * 2); | |
1321 | else | |
1322 | room_left -= to_send; | |
1323 | if (room_left < 0) { | |
1324 | *len_sent = 0; | |
1325 | audit_log_end(*ab); | |
1326 | *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE); | |
1327 | if (!*ab) | |
1328 | return 0; | |
1329 | } | |
bdf4c48a | 1330 | |
bdf4c48a | 1331 | /* |
de6bbd1d EP |
1332 | * first record needs to say how long the original string was |
1333 | * so we can be sure nothing was lost. | |
1334 | */ | |
1335 | if ((i == 0) && (too_long)) | |
ca96a895 | 1336 | audit_log_format(*ab, " a%d_len=%zu", arg_num, |
de6bbd1d EP |
1337 | has_cntl ? 2*len : len); |
1338 | ||
1339 | /* | |
1340 | * normally arguments are small enough to fit and we already | |
1341 | * filled buf above when we checked for control characters | |
1342 | * so don't bother with another copy_from_user | |
bdf4c48a | 1343 | */ |
de6bbd1d EP |
1344 | if (len >= max_execve_audit_len) |
1345 | ret = copy_from_user(buf, p, to_send); | |
1346 | else | |
1347 | ret = 0; | |
040b3a2d | 1348 | if (ret) { |
bdf4c48a PZ |
1349 | WARN_ON(1); |
1350 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1351 | return -1; |
bdf4c48a | 1352 | } |
de6bbd1d EP |
1353 | buf[to_send] = '\0'; |
1354 | ||
1355 | /* actually log it */ | |
ca96a895 | 1356 | audit_log_format(*ab, " a%d", arg_num); |
de6bbd1d EP |
1357 | if (too_long) |
1358 | audit_log_format(*ab, "[%d]", i); | |
1359 | audit_log_format(*ab, "="); | |
1360 | if (has_cntl) | |
b556f8ad | 1361 | audit_log_n_hex(*ab, buf, to_send); |
de6bbd1d | 1362 | else |
9d960985 | 1363 | audit_log_string(*ab, buf); |
de6bbd1d EP |
1364 | |
1365 | p += to_send; | |
1366 | len_left -= to_send; | |
1367 | *len_sent += arg_num_len; | |
1368 | if (has_cntl) | |
1369 | *len_sent += to_send * 2; | |
1370 | else | |
1371 | *len_sent += to_send; | |
1372 | } | |
1373 | /* include the null we didn't log */ | |
1374 | return len + 1; | |
1375 | } | |
1376 | ||
1377 | static void audit_log_execve_info(struct audit_context *context, | |
1378 | struct audit_buffer **ab, | |
1379 | struct audit_aux_data_execve *axi) | |
1380 | { | |
5afb8a3f XW |
1381 | int i, len; |
1382 | size_t len_sent = 0; | |
de6bbd1d EP |
1383 | const char __user *p; |
1384 | char *buf; | |
bdf4c48a | 1385 | |
de6bbd1d EP |
1386 | if (axi->mm != current->mm) |
1387 | return; /* execve failed, no additional info */ | |
1388 | ||
1389 | p = (const char __user *)axi->mm->arg_start; | |
bdf4c48a | 1390 | |
ca96a895 | 1391 | audit_log_format(*ab, "argc=%d", axi->argc); |
de6bbd1d EP |
1392 | |
1393 | /* | |
1394 | * we need some kernel buffer to hold the userspace args. Just | |
1395 | * allocate one big one rather than allocating one of the right size | |
1396 | * for every single argument inside audit_log_single_execve_arg() | |
1397 | * should be <8k allocation so should be pretty safe. | |
1398 | */ | |
1399 | buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1400 | if (!buf) { | |
1401 | audit_panic("out of memory for argv string\n"); | |
1402 | return; | |
bdf4c48a | 1403 | } |
de6bbd1d EP |
1404 | |
1405 | for (i = 0; i < axi->argc; i++) { | |
1406 | len = audit_log_single_execve_arg(context, ab, i, | |
1407 | &len_sent, p, buf); | |
1408 | if (len <= 0) | |
1409 | break; | |
1410 | p += len; | |
1411 | } | |
1412 | kfree(buf); | |
bdf4c48a PZ |
1413 | } |
1414 | ||
851f7ff5 EP |
1415 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1416 | { | |
1417 | int i; | |
1418 | ||
1419 | audit_log_format(ab, " %s=", prefix); | |
1420 | CAP_FOR_EACH_U32(i) { | |
1421 | audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1426 | { | |
1427 | kernel_cap_t *perm = &name->fcap.permitted; | |
1428 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1429 | int log = 0; | |
1430 | ||
1431 | if (!cap_isclear(*perm)) { | |
1432 | audit_log_cap(ab, "cap_fp", perm); | |
1433 | log = 1; | |
1434 | } | |
1435 | if (!cap_isclear(*inh)) { | |
1436 | audit_log_cap(ab, "cap_fi", inh); | |
1437 | log = 1; | |
1438 | } | |
1439 | ||
1440 | if (log) | |
1441 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); | |
1442 | } | |
1443 | ||
a33e6751 | 1444 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1445 | { |
1446 | struct audit_buffer *ab; | |
1447 | int i; | |
1448 | ||
1449 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1450 | if (!ab) | |
1451 | return; | |
1452 | ||
1453 | switch (context->type) { | |
1454 | case AUDIT_SOCKETCALL: { | |
1455 | int nargs = context->socketcall.nargs; | |
1456 | audit_log_format(ab, "nargs=%d", nargs); | |
1457 | for (i = 0; i < nargs; i++) | |
1458 | audit_log_format(ab, " a%d=%lx", i, | |
1459 | context->socketcall.args[i]); | |
1460 | break; } | |
a33e6751 AV |
1461 | case AUDIT_IPC: { |
1462 | u32 osid = context->ipc.osid; | |
1463 | ||
2570ebbd | 1464 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
cca080d9 EB |
1465 | from_kuid(&init_user_ns, context->ipc.uid), |
1466 | from_kgid(&init_user_ns, context->ipc.gid), | |
1467 | context->ipc.mode); | |
a33e6751 AV |
1468 | if (osid) { |
1469 | char *ctx = NULL; | |
1470 | u32 len; | |
1471 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1472 | audit_log_format(ab, " osid=%u", osid); | |
1473 | *call_panic = 1; | |
1474 | } else { | |
1475 | audit_log_format(ab, " obj=%s", ctx); | |
1476 | security_release_secctx(ctx, len); | |
1477 | } | |
1478 | } | |
e816f370 AV |
1479 | if (context->ipc.has_perm) { |
1480 | audit_log_end(ab); | |
1481 | ab = audit_log_start(context, GFP_KERNEL, | |
1482 | AUDIT_IPC_SET_PERM); | |
1483 | audit_log_format(ab, | |
2570ebbd | 1484 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1485 | context->ipc.qbytes, |
1486 | context->ipc.perm_uid, | |
1487 | context->ipc.perm_gid, | |
1488 | context->ipc.perm_mode); | |
1489 | if (!ab) | |
1490 | return; | |
1491 | } | |
a33e6751 | 1492 | break; } |
564f6993 AV |
1493 | case AUDIT_MQ_OPEN: { |
1494 | audit_log_format(ab, | |
df0a4283 | 1495 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1496 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1497 | context->mq_open.oflag, context->mq_open.mode, | |
1498 | context->mq_open.attr.mq_flags, | |
1499 | context->mq_open.attr.mq_maxmsg, | |
1500 | context->mq_open.attr.mq_msgsize, | |
1501 | context->mq_open.attr.mq_curmsgs); | |
1502 | break; } | |
c32c8af4 AV |
1503 | case AUDIT_MQ_SENDRECV: { |
1504 | audit_log_format(ab, | |
1505 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
1506 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
1507 | context->mq_sendrecv.mqdes, | |
1508 | context->mq_sendrecv.msg_len, | |
1509 | context->mq_sendrecv.msg_prio, | |
1510 | context->mq_sendrecv.abs_timeout.tv_sec, | |
1511 | context->mq_sendrecv.abs_timeout.tv_nsec); | |
1512 | break; } | |
20114f71 AV |
1513 | case AUDIT_MQ_NOTIFY: { |
1514 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", | |
1515 | context->mq_notify.mqdes, | |
1516 | context->mq_notify.sigev_signo); | |
1517 | break; } | |
7392906e AV |
1518 | case AUDIT_MQ_GETSETATTR: { |
1519 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1520 | audit_log_format(ab, | |
1521 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1522 | "mq_curmsgs=%ld ", | |
1523 | context->mq_getsetattr.mqdes, | |
1524 | attr->mq_flags, attr->mq_maxmsg, | |
1525 | attr->mq_msgsize, attr->mq_curmsgs); | |
1526 | break; } | |
57f71a0a AV |
1527 | case AUDIT_CAPSET: { |
1528 | audit_log_format(ab, "pid=%d", context->capset.pid); | |
1529 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1530 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1531 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
1532 | break; } | |
120a795d AV |
1533 | case AUDIT_MMAP: { |
1534 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, | |
1535 | context->mmap.flags); | |
1536 | break; } | |
f3298dc4 AV |
1537 | } |
1538 | audit_log_end(ab); | |
1539 | } | |
1540 | ||
5195d8e2 EP |
1541 | static void audit_log_name(struct audit_context *context, struct audit_names *n, |
1542 | int record_num, int *call_panic) | |
1543 | { | |
1544 | struct audit_buffer *ab; | |
1545 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1546 | if (!ab) | |
1547 | return; /* audit_panic has been called */ | |
1548 | ||
1549 | audit_log_format(ab, "item=%d", record_num); | |
1550 | ||
1551 | if (n->name) { | |
1552 | switch (n->name_len) { | |
1553 | case AUDIT_NAME_FULL: | |
1554 | /* log the full path */ | |
1555 | audit_log_format(ab, " name="); | |
1556 | audit_log_untrustedstring(ab, n->name); | |
1557 | break; | |
1558 | case 0: | |
1559 | /* name was specified as a relative path and the | |
1560 | * directory component is the cwd */ | |
c158a35c | 1561 | audit_log_d_path(ab, " name=", &context->pwd); |
5195d8e2 EP |
1562 | break; |
1563 | default: | |
1564 | /* log the name's directory component */ | |
1565 | audit_log_format(ab, " name="); | |
1566 | audit_log_n_untrustedstring(ab, n->name, | |
1567 | n->name_len); | |
1568 | } | |
1569 | } else | |
1570 | audit_log_format(ab, " name=(null)"); | |
1571 | ||
1572 | if (n->ino != (unsigned long)-1) { | |
1573 | audit_log_format(ab, " inode=%lu" | |
1574 | " dev=%02x:%02x mode=%#ho" | |
1575 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1576 | n->ino, | |
1577 | MAJOR(n->dev), | |
1578 | MINOR(n->dev), | |
1579 | n->mode, | |
cca080d9 EB |
1580 | from_kuid(&init_user_ns, n->uid), |
1581 | from_kgid(&init_user_ns, n->gid), | |
5195d8e2 EP |
1582 | MAJOR(n->rdev), |
1583 | MINOR(n->rdev)); | |
1584 | } | |
1585 | if (n->osid != 0) { | |
1586 | char *ctx = NULL; | |
1587 | u32 len; | |
1588 | if (security_secid_to_secctx( | |
1589 | n->osid, &ctx, &len)) { | |
1590 | audit_log_format(ab, " osid=%u", n->osid); | |
1591 | *call_panic = 2; | |
1592 | } else { | |
1593 | audit_log_format(ab, " obj=%s", ctx); | |
1594 | security_release_secctx(ctx, len); | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | audit_log_fcaps(ab, n); | |
1599 | ||
1600 | audit_log_end(ab); | |
1601 | } | |
1602 | ||
e495149b | 1603 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1604 | { |
9c7aa6aa | 1605 | int i, call_panic = 0; |
1da177e4 | 1606 | struct audit_buffer *ab; |
7551ced3 | 1607 | struct audit_aux_data *aux; |
5195d8e2 | 1608 | struct audit_names *n; |
1da177e4 | 1609 | |
e495149b | 1610 | /* tsk == current */ |
3f2792ff | 1611 | context->personality = tsk->personality; |
e495149b AV |
1612 | |
1613 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1614 | if (!ab) |
1615 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1616 | audit_log_format(ab, "arch=%x syscall=%d", |
1617 | context->arch, context->major); | |
1da177e4 LT |
1618 | if (context->personality != PER_LINUX) |
1619 | audit_log_format(ab, " per=%lx", context->personality); | |
1620 | if (context->return_valid) | |
9f8dbe9c | 1621 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b | 1622 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1623 | context->return_code); | |
eb84a20e | 1624 | |
1da177e4 | 1625 | audit_log_format(ab, |
e23eb920 PM |
1626 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d", |
1627 | context->argv[0], | |
1628 | context->argv[1], | |
1629 | context->argv[2], | |
1630 | context->argv[3], | |
1631 | context->name_count); | |
eb84a20e | 1632 | |
e495149b | 1633 | audit_log_task_info(ab, tsk); |
9d960985 | 1634 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1635 | audit_log_end(ab); |
1da177e4 | 1636 | |
7551ced3 | 1637 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1638 | |
e495149b | 1639 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1640 | if (!ab) |
1641 | continue; /* audit_panic has been called */ | |
1642 | ||
1da177e4 | 1643 | switch (aux->type) { |
20ca73bc | 1644 | |
473ae30b AV |
1645 | case AUDIT_EXECVE: { |
1646 | struct audit_aux_data_execve *axi = (void *)aux; | |
de6bbd1d | 1647 | audit_log_execve_info(context, &ab, axi); |
473ae30b | 1648 | break; } |
073115d6 | 1649 | |
3fc689e9 EP |
1650 | case AUDIT_BPRM_FCAPS: { |
1651 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1652 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1653 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1654 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1655 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1656 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1657 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1658 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
1659 | audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted); | |
1660 | audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); | |
1661 | audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); | |
1662 | break; } | |
1663 | ||
1da177e4 LT |
1664 | } |
1665 | audit_log_end(ab); | |
1da177e4 LT |
1666 | } |
1667 | ||
f3298dc4 | 1668 | if (context->type) |
a33e6751 | 1669 | show_special(context, &call_panic); |
f3298dc4 | 1670 | |
157cf649 AV |
1671 | if (context->fds[0] >= 0) { |
1672 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1673 | if (ab) { | |
1674 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1675 | context->fds[0], context->fds[1]); | |
1676 | audit_log_end(ab); | |
1677 | } | |
1678 | } | |
1679 | ||
4f6b434f AV |
1680 | if (context->sockaddr_len) { |
1681 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1682 | if (ab) { | |
1683 | audit_log_format(ab, "saddr="); | |
1684 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1685 | context->sockaddr_len); | |
1686 | audit_log_end(ab); | |
1687 | } | |
1688 | } | |
1689 | ||
e54dc243 AG |
1690 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1691 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1692 | |
1693 | for (i = 0; i < axs->pid_count; i++) | |
1694 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1695 | axs->target_auid[i], |
1696 | axs->target_uid[i], | |
4746ec5b | 1697 | axs->target_sessionid[i], |
c2a7780e EP |
1698 | axs->target_sid[i], |
1699 | axs->target_comm[i])) | |
e54dc243 | 1700 | call_panic = 1; |
a5cb013d AV |
1701 | } |
1702 | ||
e54dc243 AG |
1703 | if (context->target_pid && |
1704 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1705 | context->target_auid, context->target_uid, |
4746ec5b | 1706 | context->target_sessionid, |
c2a7780e | 1707 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1708 | call_panic = 1; |
1709 | ||
44707fdf | 1710 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1711 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1712 | if (ab) { |
c158a35c | 1713 | audit_log_d_path(ab, " cwd=", &context->pwd); |
8f37d47c DW |
1714 | audit_log_end(ab); |
1715 | } | |
1716 | } | |
73241ccc | 1717 | |
5195d8e2 EP |
1718 | i = 0; |
1719 | list_for_each_entry(n, &context->names_list, list) | |
1720 | audit_log_name(context, n, i++, &call_panic); | |
c0641f28 EP |
1721 | |
1722 | /* Send end of event record to help user space know we are finished */ | |
1723 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1724 | if (ab) | |
1725 | audit_log_end(ab); | |
9c7aa6aa SG |
1726 | if (call_panic) |
1727 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1728 | } |
1729 | ||
b0dd25a8 RD |
1730 | /** |
1731 | * audit_free - free a per-task audit context | |
1732 | * @tsk: task whose audit context block to free | |
1733 | * | |
fa84cb93 | 1734 | * Called from copy_process and do_exit |
b0dd25a8 | 1735 | */ |
a4ff8dba | 1736 | void __audit_free(struct task_struct *tsk) |
1da177e4 LT |
1737 | { |
1738 | struct audit_context *context; | |
1739 | ||
1da177e4 | 1740 | context = audit_get_context(tsk, 0, 0); |
56179a6e | 1741 | if (!context) |
1da177e4 LT |
1742 | return; |
1743 | ||
1744 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1745 | * function (e.g., exit_group), then free context block. |
1746 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1747 | * in the context of the idle thread */ |
e495149b | 1748 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1749 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1750 | audit_log_exit(context, tsk); |
916d7576 AV |
1751 | if (!list_empty(&context->killed_trees)) |
1752 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1753 | |
1754 | audit_free_context(context); | |
1755 | } | |
1756 | ||
b0dd25a8 RD |
1757 | /** |
1758 | * audit_syscall_entry - fill in an audit record at syscall entry | |
b0dd25a8 RD |
1759 | * @arch: architecture type |
1760 | * @major: major syscall type (function) | |
1761 | * @a1: additional syscall register 1 | |
1762 | * @a2: additional syscall register 2 | |
1763 | * @a3: additional syscall register 3 | |
1764 | * @a4: additional syscall register 4 | |
1765 | * | |
1766 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1767 | * audit context was created when the task was created and the state or |
1768 | * filters demand the audit context be built. If the state from the | |
1769 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1770 | * then the record will be written at syscall exit time (otherwise, it | |
1771 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1772 | * be written). |
1773 | */ | |
b05d8447 | 1774 | void __audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1775 | unsigned long a1, unsigned long a2, |
1776 | unsigned long a3, unsigned long a4) | |
1777 | { | |
5411be59 | 1778 | struct task_struct *tsk = current; |
1da177e4 LT |
1779 | struct audit_context *context = tsk->audit_context; |
1780 | enum audit_state state; | |
1781 | ||
56179a6e | 1782 | if (!context) |
86a1c34a | 1783 | return; |
1da177e4 | 1784 | |
b0dd25a8 RD |
1785 | /* |
1786 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1787 | * calls in kernel_thread via the entry.S interface, instead of |
1788 | * with direct calls. (If you are porting to a new | |
1789 | * architecture, hitting this condition can indicate that you | |
1790 | * got the _exit/_leave calls backward in entry.S.) | |
1791 | * | |
1792 | * i386 no | |
1793 | * x86_64 no | |
2ef9481e | 1794 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1795 | * |
1796 | * This also happens with vm86 emulation in a non-nested manner | |
1797 | * (entries without exits), so this case must be caught. | |
1798 | */ | |
1799 | if (context->in_syscall) { | |
1800 | struct audit_context *newctx; | |
1801 | ||
1da177e4 LT |
1802 | #if AUDIT_DEBUG |
1803 | printk(KERN_ERR | |
1804 | "audit(:%d) pid=%d in syscall=%d;" | |
1805 | " entering syscall=%d\n", | |
1806 | context->serial, tsk->pid, context->major, major); | |
1807 | #endif | |
1808 | newctx = audit_alloc_context(context->state); | |
1809 | if (newctx) { | |
1810 | newctx->previous = context; | |
1811 | context = newctx; | |
1812 | tsk->audit_context = newctx; | |
1813 | } else { | |
1814 | /* If we can't alloc a new context, the best we | |
1815 | * can do is to leak memory (any pending putname | |
1816 | * will be lost). The only other alternative is | |
1817 | * to abandon auditing. */ | |
1818 | audit_zero_context(context, context->state); | |
1819 | } | |
1820 | } | |
1821 | BUG_ON(context->in_syscall || context->name_count); | |
1822 | ||
1823 | if (!audit_enabled) | |
1824 | return; | |
1825 | ||
2fd6f58b | 1826 | context->arch = arch; |
1da177e4 LT |
1827 | context->major = major; |
1828 | context->argv[0] = a1; | |
1829 | context->argv[1] = a2; | |
1830 | context->argv[2] = a3; | |
1831 | context->argv[3] = a4; | |
1832 | ||
1833 | state = context->state; | |
d51374ad | 1834 | context->dummy = !audit_n_rules; |
0590b933 AV |
1835 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1836 | context->prio = 0; | |
0f45aa18 | 1837 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
0590b933 | 1838 | } |
56179a6e | 1839 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1840 | return; |
1841 | ||
ce625a80 | 1842 | context->serial = 0; |
1da177e4 LT |
1843 | context->ctime = CURRENT_TIME; |
1844 | context->in_syscall = 1; | |
0590b933 | 1845 | context->current_state = state; |
419c58f1 | 1846 | context->ppid = 0; |
1da177e4 LT |
1847 | } |
1848 | ||
b0dd25a8 RD |
1849 | /** |
1850 | * audit_syscall_exit - deallocate audit context after a system call | |
42ae610c RD |
1851 | * @success: success value of the syscall |
1852 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1853 | * |
1854 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1855 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1856 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1857 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1858 | * free the names stored from getname(). |
1859 | */ | |
d7e7528b | 1860 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 | 1861 | { |
5411be59 | 1862 | struct task_struct *tsk = current; |
1da177e4 LT |
1863 | struct audit_context *context; |
1864 | ||
d7e7528b EP |
1865 | if (success) |
1866 | success = AUDITSC_SUCCESS; | |
1867 | else | |
1868 | success = AUDITSC_FAILURE; | |
1da177e4 | 1869 | |
d7e7528b | 1870 | context = audit_get_context(tsk, success, return_code); |
56179a6e | 1871 | if (!context) |
97e94c45 | 1872 | return; |
1da177e4 | 1873 | |
0590b933 | 1874 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1875 | audit_log_exit(context, tsk); |
1da177e4 LT |
1876 | |
1877 | context->in_syscall = 0; | |
0590b933 | 1878 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1879 | |
916d7576 AV |
1880 | if (!list_empty(&context->killed_trees)) |
1881 | audit_kill_trees(&context->killed_trees); | |
1882 | ||
1da177e4 LT |
1883 | if (context->previous) { |
1884 | struct audit_context *new_context = context->previous; | |
1885 | context->previous = NULL; | |
1886 | audit_free_context(context); | |
1887 | tsk->audit_context = new_context; | |
1888 | } else { | |
1889 | audit_free_names(context); | |
74c3cbe3 | 1890 | unroll_tree_refs(context, NULL, 0); |
1da177e4 | 1891 | audit_free_aux(context); |
e54dc243 AG |
1892 | context->aux = NULL; |
1893 | context->aux_pids = NULL; | |
a5cb013d | 1894 | context->target_pid = 0; |
e54dc243 | 1895 | context->target_sid = 0; |
4f6b434f | 1896 | context->sockaddr_len = 0; |
f3298dc4 | 1897 | context->type = 0; |
157cf649 | 1898 | context->fds[0] = -1; |
e048e02c AV |
1899 | if (context->state != AUDIT_RECORD_CONTEXT) { |
1900 | kfree(context->filterkey); | |
1901 | context->filterkey = NULL; | |
1902 | } | |
1da177e4 LT |
1903 | tsk->audit_context = context; |
1904 | } | |
1da177e4 LT |
1905 | } |
1906 | ||
74c3cbe3 AV |
1907 | static inline void handle_one(const struct inode *inode) |
1908 | { | |
1909 | #ifdef CONFIG_AUDIT_TREE | |
1910 | struct audit_context *context; | |
1911 | struct audit_tree_refs *p; | |
1912 | struct audit_chunk *chunk; | |
1913 | int count; | |
e61ce867 | 1914 | if (likely(hlist_empty(&inode->i_fsnotify_marks))) |
74c3cbe3 AV |
1915 | return; |
1916 | context = current->audit_context; | |
1917 | p = context->trees; | |
1918 | count = context->tree_count; | |
1919 | rcu_read_lock(); | |
1920 | chunk = audit_tree_lookup(inode); | |
1921 | rcu_read_unlock(); | |
1922 | if (!chunk) | |
1923 | return; | |
1924 | if (likely(put_tree_ref(context, chunk))) | |
1925 | return; | |
1926 | if (unlikely(!grow_tree_refs(context))) { | |
436c405c | 1927 | printk(KERN_WARNING "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1928 | audit_set_auditable(context); |
1929 | audit_put_chunk(chunk); | |
1930 | unroll_tree_refs(context, p, count); | |
1931 | return; | |
1932 | } | |
1933 | put_tree_ref(context, chunk); | |
1934 | #endif | |
1935 | } | |
1936 | ||
1937 | static void handle_path(const struct dentry *dentry) | |
1938 | { | |
1939 | #ifdef CONFIG_AUDIT_TREE | |
1940 | struct audit_context *context; | |
1941 | struct audit_tree_refs *p; | |
1942 | const struct dentry *d, *parent; | |
1943 | struct audit_chunk *drop; | |
1944 | unsigned long seq; | |
1945 | int count; | |
1946 | ||
1947 | context = current->audit_context; | |
1948 | p = context->trees; | |
1949 | count = context->tree_count; | |
1950 | retry: | |
1951 | drop = NULL; | |
1952 | d = dentry; | |
1953 | rcu_read_lock(); | |
1954 | seq = read_seqbegin(&rename_lock); | |
1955 | for(;;) { | |
1956 | struct inode *inode = d->d_inode; | |
e61ce867 | 1957 | if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) { |
74c3cbe3 AV |
1958 | struct audit_chunk *chunk; |
1959 | chunk = audit_tree_lookup(inode); | |
1960 | if (chunk) { | |
1961 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1962 | drop = chunk; | |
1963 | break; | |
1964 | } | |
1965 | } | |
1966 | } | |
1967 | parent = d->d_parent; | |
1968 | if (parent == d) | |
1969 | break; | |
1970 | d = parent; | |
1971 | } | |
1972 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1973 | rcu_read_unlock(); | |
1974 | if (!drop) { | |
1975 | /* just a race with rename */ | |
1976 | unroll_tree_refs(context, p, count); | |
1977 | goto retry; | |
1978 | } | |
1979 | audit_put_chunk(drop); | |
1980 | if (grow_tree_refs(context)) { | |
1981 | /* OK, got more space */ | |
1982 | unroll_tree_refs(context, p, count); | |
1983 | goto retry; | |
1984 | } | |
1985 | /* too bad */ | |
1986 | printk(KERN_WARNING | |
436c405c | 1987 | "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1988 | unroll_tree_refs(context, p, count); |
1989 | audit_set_auditable(context); | |
1990 | return; | |
1991 | } | |
1992 | rcu_read_unlock(); | |
1993 | #endif | |
1994 | } | |
1995 | ||
78e2e802 JL |
1996 | static struct audit_names *audit_alloc_name(struct audit_context *context, |
1997 | unsigned char type) | |
5195d8e2 EP |
1998 | { |
1999 | struct audit_names *aname; | |
2000 | ||
2001 | if (context->name_count < AUDIT_NAMES) { | |
2002 | aname = &context->preallocated_names[context->name_count]; | |
2003 | memset(aname, 0, sizeof(*aname)); | |
2004 | } else { | |
2005 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
2006 | if (!aname) | |
2007 | return NULL; | |
2008 | aname->should_free = true; | |
2009 | } | |
2010 | ||
2011 | aname->ino = (unsigned long)-1; | |
78e2e802 | 2012 | aname->type = type; |
5195d8e2 EP |
2013 | list_add_tail(&aname->list, &context->names_list); |
2014 | ||
2015 | context->name_count++; | |
2016 | #if AUDIT_DEBUG | |
2017 | context->ino_count++; | |
2018 | #endif | |
2019 | return aname; | |
2020 | } | |
2021 | ||
b0dd25a8 RD |
2022 | /** |
2023 | * audit_getname - add a name to the list | |
2024 | * @name: name to add | |
2025 | * | |
2026 | * Add a name to the list of audit names for this context. | |
2027 | * Called from fs/namei.c:getname(). | |
2028 | */ | |
d8945bb5 | 2029 | void __audit_getname(const char *name) |
1da177e4 LT |
2030 | { |
2031 | struct audit_context *context = current->audit_context; | |
5195d8e2 | 2032 | struct audit_names *n; |
1da177e4 | 2033 | |
1da177e4 LT |
2034 | if (!context->in_syscall) { |
2035 | #if AUDIT_DEBUG == 2 | |
2036 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
2037 | __FILE__, __LINE__, context->serial, name); | |
2038 | dump_stack(); | |
2039 | #endif | |
2040 | return; | |
2041 | } | |
5195d8e2 | 2042 | |
78e2e802 | 2043 | n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN); |
5195d8e2 EP |
2044 | if (!n) |
2045 | return; | |
2046 | ||
2047 | n->name = name; | |
2048 | n->name_len = AUDIT_NAME_FULL; | |
2049 | n->name_put = true; | |
2050 | ||
f7ad3c6b MS |
2051 | if (!context->pwd.dentry) |
2052 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
2053 | } |
2054 | ||
b0dd25a8 RD |
2055 | /* audit_putname - intercept a putname request |
2056 | * @name: name to intercept and delay for putname | |
2057 | * | |
2058 | * If we have stored the name from getname in the audit context, | |
2059 | * then we delay the putname until syscall exit. | |
2060 | * Called from include/linux/fs.h:putname(). | |
2061 | */ | |
1da177e4 LT |
2062 | void audit_putname(const char *name) |
2063 | { | |
2064 | struct audit_context *context = current->audit_context; | |
2065 | ||
2066 | BUG_ON(!context); | |
2067 | if (!context->in_syscall) { | |
2068 | #if AUDIT_DEBUG == 2 | |
2069 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
2070 | __FILE__, __LINE__, context->serial, name); | |
2071 | if (context->name_count) { | |
5195d8e2 | 2072 | struct audit_names *n; |
1da177e4 | 2073 | int i; |
5195d8e2 EP |
2074 | |
2075 | list_for_each_entry(n, &context->names_list, list) | |
1da177e4 | 2076 | printk(KERN_ERR "name[%d] = %p = %s\n", i, |
5195d8e2 EP |
2077 | n->name, n->name ?: "(null)"); |
2078 | } | |
1da177e4 LT |
2079 | #endif |
2080 | __putname(name); | |
2081 | } | |
2082 | #if AUDIT_DEBUG | |
2083 | else { | |
2084 | ++context->put_count; | |
2085 | if (context->put_count > context->name_count) { | |
2086 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
2087 | " in_syscall=%d putname(%p) name_count=%d" | |
2088 | " put_count=%d\n", | |
2089 | __FILE__, __LINE__, | |
2090 | context->serial, context->major, | |
2091 | context->in_syscall, name, context->name_count, | |
2092 | context->put_count); | |
2093 | dump_stack(); | |
2094 | } | |
2095 | } | |
2096 | #endif | |
2097 | } | |
2098 | ||
851f7ff5 EP |
2099 | static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) |
2100 | { | |
2101 | struct cpu_vfs_cap_data caps; | |
2102 | int rc; | |
2103 | ||
851f7ff5 EP |
2104 | if (!dentry) |
2105 | return 0; | |
2106 | ||
2107 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
2108 | if (rc) | |
2109 | return rc; | |
2110 | ||
2111 | name->fcap.permitted = caps.permitted; | |
2112 | name->fcap.inheritable = caps.inheritable; | |
2113 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2114 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2115 | ||
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | ||
3e2efce0 | 2120 | /* Copy inode data into an audit_names. */ |
851f7ff5 EP |
2121 | static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
2122 | const struct inode *inode) | |
8c8570fb | 2123 | { |
3e2efce0 AG |
2124 | name->ino = inode->i_ino; |
2125 | name->dev = inode->i_sb->s_dev; | |
2126 | name->mode = inode->i_mode; | |
2127 | name->uid = inode->i_uid; | |
2128 | name->gid = inode->i_gid; | |
2129 | name->rdev = inode->i_rdev; | |
2a862b32 | 2130 | security_inode_getsecid(inode, &name->osid); |
851f7ff5 | 2131 | audit_copy_fcaps(name, dentry); |
8c8570fb DK |
2132 | } |
2133 | ||
b0dd25a8 | 2134 | /** |
bfcec708 | 2135 | * __audit_inode - store the inode and device from a lookup |
b0dd25a8 | 2136 | * @name: name being audited |
481968f4 | 2137 | * @dentry: dentry being audited |
bfcec708 | 2138 | * @parent: does this dentry represent the parent? |
b0dd25a8 | 2139 | */ |
bfcec708 JL |
2140 | void __audit_inode(const char *name, const struct dentry *dentry, |
2141 | unsigned int parent) | |
1da177e4 | 2142 | { |
1da177e4 | 2143 | struct audit_context *context = current->audit_context; |
74c3cbe3 | 2144 | const struct inode *inode = dentry->d_inode; |
5195d8e2 | 2145 | struct audit_names *n; |
1da177e4 LT |
2146 | |
2147 | if (!context->in_syscall) | |
2148 | return; | |
5195d8e2 | 2149 | |
9cec9d68 JL |
2150 | if (!name) |
2151 | goto out_alloc; | |
2152 | ||
5195d8e2 | 2153 | list_for_each_entry_reverse(n, &context->names_list, list) { |
bfcec708 JL |
2154 | /* does the name pointer match? */ |
2155 | if (n->name != name) | |
2156 | continue; | |
2157 | ||
2158 | /* match the correct record type */ | |
2159 | if (parent) { | |
2160 | if (n->type == AUDIT_TYPE_PARENT || | |
2161 | n->type == AUDIT_TYPE_UNKNOWN) | |
2162 | goto out; | |
2163 | } else { | |
2164 | if (n->type != AUDIT_TYPE_PARENT) | |
2165 | goto out; | |
2166 | } | |
1da177e4 | 2167 | } |
5195d8e2 | 2168 | |
9cec9d68 | 2169 | out_alloc: |
bfcec708 JL |
2170 | /* unable to find the name from a previous getname(). Allocate a new |
2171 | * anonymous entry. | |
2172 | */ | |
78e2e802 | 2173 | n = audit_alloc_name(context, AUDIT_TYPE_NORMAL); |
5195d8e2 EP |
2174 | if (!n) |
2175 | return; | |
2176 | out: | |
bfcec708 JL |
2177 | if (parent) { |
2178 | n->name_len = n->name ? parent_len(n->name) : AUDIT_NAME_FULL; | |
2179 | n->type = AUDIT_TYPE_PARENT; | |
2180 | } else { | |
2181 | n->name_len = AUDIT_NAME_FULL; | |
2182 | n->type = AUDIT_TYPE_NORMAL; | |
2183 | } | |
74c3cbe3 | 2184 | handle_path(dentry); |
5195d8e2 | 2185 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
2186 | } |
2187 | ||
2188 | /** | |
c43a25ab | 2189 | * __audit_inode_child - collect inode info for created/removed objects |
73d3ec5a | 2190 | * @parent: inode of dentry parent |
c43a25ab | 2191 | * @dentry: dentry being audited |
73241ccc AG |
2192 | * |
2193 | * For syscalls that create or remove filesystem objects, audit_inode | |
2194 | * can only collect information for the filesystem object's parent. | |
2195 | * This call updates the audit context with the child's information. | |
2196 | * Syscalls that create a new filesystem object must be hooked after | |
2197 | * the object is created. Syscalls that remove a filesystem object | |
2198 | * must be hooked prior, in order to capture the target inode during | |
2199 | * unsuccessful attempts. | |
2200 | */ | |
c43a25ab JL |
2201 | void __audit_inode_child(const struct inode *parent, |
2202 | const struct dentry *dentry) | |
73241ccc | 2203 | { |
73241ccc | 2204 | struct audit_context *context = current->audit_context; |
5712e88f | 2205 | const char *found_parent = NULL, *found_child = NULL; |
5a190ae6 | 2206 | const struct inode *inode = dentry->d_inode; |
cccc6bba | 2207 | const char *dname = dentry->d_name.name; |
5195d8e2 | 2208 | struct audit_names *n; |
73241ccc AG |
2209 | |
2210 | if (!context->in_syscall) | |
2211 | return; | |
2212 | ||
74c3cbe3 AV |
2213 | if (inode) |
2214 | handle_one(inode); | |
73241ccc | 2215 | |
5712e88f | 2216 | /* parent is more likely, look for it first */ |
5195d8e2 | 2217 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2218 | if (!n->name) |
2219 | continue; | |
2220 | ||
2221 | if (n->ino == parent->i_ino && | |
e3d6b07b | 2222 | !audit_compare_dname_path(dname, n->name, n->name_len)) { |
5712e88f AG |
2223 | found_parent = n->name; |
2224 | goto add_names; | |
f368c07d | 2225 | } |
5712e88f | 2226 | } |
73241ccc | 2227 | |
5712e88f | 2228 | /* no matching parent, look for matching child */ |
5195d8e2 | 2229 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2230 | if (!n->name) |
2231 | continue; | |
2232 | ||
2233 | /* strcmp() is the more likely scenario */ | |
2234 | if (!strcmp(dname, n->name) || | |
e3d6b07b JL |
2235 | !audit_compare_dname_path(dname, n->name, |
2236 | AUDIT_NAME_FULL)) { | |
5712e88f | 2237 | if (inode) |
1c2e51e8 | 2238 | audit_copy_inode(n, dentry, inode); |
5712e88f AG |
2239 | else |
2240 | n->ino = (unsigned long)-1; | |
78e2e802 | 2241 | n->type = AUDIT_TYPE_NORMAL; |
5712e88f AG |
2242 | found_child = n->name; |
2243 | goto add_names; | |
2244 | } | |
ac9910ce | 2245 | } |
5712e88f AG |
2246 | |
2247 | add_names: | |
2248 | if (!found_parent) { | |
78e2e802 | 2249 | n = audit_alloc_name(context, AUDIT_TYPE_NORMAL); |
5195d8e2 | 2250 | if (!n) |
ac9910ce | 2251 | return; |
5195d8e2 | 2252 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 2253 | } |
5712e88f AG |
2254 | |
2255 | if (!found_child) { | |
78e2e802 | 2256 | n = audit_alloc_name(context, AUDIT_TYPE_NORMAL); |
5195d8e2 | 2257 | if (!n) |
5712e88f | 2258 | return; |
5712e88f AG |
2259 | |
2260 | /* Re-use the name belonging to the slot for a matching parent | |
2261 | * directory. All names for this context are relinquished in | |
2262 | * audit_free_names() */ | |
2263 | if (found_parent) { | |
5195d8e2 EP |
2264 | n->name = found_parent; |
2265 | n->name_len = AUDIT_NAME_FULL; | |
5712e88f | 2266 | /* don't call __putname() */ |
5195d8e2 | 2267 | n->name_put = false; |
5712e88f AG |
2268 | } |
2269 | ||
2270 | if (inode) | |
1c2e51e8 | 2271 | audit_copy_inode(n, dentry, inode); |
5712e88f | 2272 | } |
3e2efce0 | 2273 | } |
50e437d5 | 2274 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2275 | |
b0dd25a8 RD |
2276 | /** |
2277 | * auditsc_get_stamp - get local copies of audit_context values | |
2278 | * @ctx: audit_context for the task | |
2279 | * @t: timespec to store time recorded in the audit_context | |
2280 | * @serial: serial value that is recorded in the audit_context | |
2281 | * | |
2282 | * Also sets the context as auditable. | |
2283 | */ | |
48887e63 | 2284 | int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e | 2285 | struct timespec *t, unsigned int *serial) |
1da177e4 | 2286 | { |
48887e63 AV |
2287 | if (!ctx->in_syscall) |
2288 | return 0; | |
ce625a80 DW |
2289 | if (!ctx->serial) |
2290 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2291 | t->tv_sec = ctx->ctime.tv_sec; |
2292 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2293 | *serial = ctx->serial; | |
0590b933 AV |
2294 | if (!ctx->prio) { |
2295 | ctx->prio = 1; | |
2296 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
2297 | } | |
48887e63 | 2298 | return 1; |
1da177e4 LT |
2299 | } |
2300 | ||
4746ec5b EP |
2301 | /* global counter which is incremented every time something logs in */ |
2302 | static atomic_t session_id = ATOMIC_INIT(0); | |
2303 | ||
b0dd25a8 | 2304 | /** |
0a300be6 | 2305 | * audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a8 RD |
2306 | * @loginuid: loginuid value |
2307 | * | |
2308 | * Returns 0. | |
2309 | * | |
2310 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2311 | */ | |
e1760bd5 | 2312 | int audit_set_loginuid(kuid_t loginuid) |
1da177e4 | 2313 | { |
0a300be6 | 2314 | struct task_struct *task = current; |
41757106 | 2315 | struct audit_context *context = task->audit_context; |
633b4545 | 2316 | unsigned int sessionid; |
41757106 | 2317 | |
633b4545 | 2318 | #ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE |
e1760bd5 | 2319 | if (uid_valid(task->loginuid)) |
633b4545 EP |
2320 | return -EPERM; |
2321 | #else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2322 | if (!capable(CAP_AUDIT_CONTROL)) | |
2323 | return -EPERM; | |
2324 | #endif /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2325 | ||
2326 | sessionid = atomic_inc_return(&session_id); | |
bfef93a5 AV |
2327 | if (context && context->in_syscall) { |
2328 | struct audit_buffer *ab; | |
2329 | ||
2330 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
2331 | if (ab) { | |
2332 | audit_log_format(ab, "login pid=%d uid=%u " | |
4746ec5b EP |
2333 | "old auid=%u new auid=%u" |
2334 | " old ses=%u new ses=%u", | |
cca080d9 EB |
2335 | task->pid, |
2336 | from_kuid(&init_user_ns, task_uid(task)), | |
e1760bd5 EB |
2337 | from_kuid(&init_user_ns, task->loginuid), |
2338 | from_kuid(&init_user_ns, loginuid), | |
4746ec5b | 2339 | task->sessionid, sessionid); |
bfef93a5 | 2340 | audit_log_end(ab); |
c0404993 | 2341 | } |
1da177e4 | 2342 | } |
4746ec5b | 2343 | task->sessionid = sessionid; |
bfef93a5 | 2344 | task->loginuid = loginuid; |
1da177e4 LT |
2345 | return 0; |
2346 | } | |
2347 | ||
20ca73bc GW |
2348 | /** |
2349 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2350 | * @oflag: open flag | |
2351 | * @mode: mode bits | |
6b962559 | 2352 | * @attr: queue attributes |
20ca73bc | 2353 | * |
20ca73bc | 2354 | */ |
df0a4283 | 2355 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2356 | { |
20ca73bc GW |
2357 | struct audit_context *context = current->audit_context; |
2358 | ||
564f6993 AV |
2359 | if (attr) |
2360 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2361 | else | |
2362 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2363 | |
564f6993 AV |
2364 | context->mq_open.oflag = oflag; |
2365 | context->mq_open.mode = mode; | |
20ca73bc | 2366 | |
564f6993 | 2367 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2368 | } |
2369 | ||
2370 | /** | |
c32c8af4 | 2371 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2372 | * @mqdes: MQ descriptor |
2373 | * @msg_len: Message length | |
2374 | * @msg_prio: Message priority | |
c32c8af4 | 2375 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2376 | * |
20ca73bc | 2377 | */ |
c32c8af4 AV |
2378 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
2379 | const struct timespec *abs_timeout) | |
20ca73bc | 2380 | { |
20ca73bc | 2381 | struct audit_context *context = current->audit_context; |
c32c8af4 | 2382 | struct timespec *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2383 | |
c32c8af4 AV |
2384 | if (abs_timeout) |
2385 | memcpy(p, abs_timeout, sizeof(struct timespec)); | |
2386 | else | |
2387 | memset(p, 0, sizeof(struct timespec)); | |
20ca73bc | 2388 | |
c32c8af4 AV |
2389 | context->mq_sendrecv.mqdes = mqdes; |
2390 | context->mq_sendrecv.msg_len = msg_len; | |
2391 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2392 | |
c32c8af4 | 2393 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2394 | } |
2395 | ||
2396 | /** | |
2397 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2398 | * @mqdes: MQ descriptor | |
6b962559 | 2399 | * @notification: Notification event |
20ca73bc | 2400 | * |
20ca73bc GW |
2401 | */ |
2402 | ||
20114f71 | 2403 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2404 | { |
20ca73bc GW |
2405 | struct audit_context *context = current->audit_context; |
2406 | ||
20114f71 AV |
2407 | if (notification) |
2408 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2409 | else | |
2410 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2411 | |
20114f71 AV |
2412 | context->mq_notify.mqdes = mqdes; |
2413 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2414 | } |
2415 | ||
2416 | /** | |
2417 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2418 | * @mqdes: MQ descriptor | |
2419 | * @mqstat: MQ flags | |
2420 | * | |
20ca73bc | 2421 | */ |
7392906e | 2422 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2423 | { |
20ca73bc | 2424 | struct audit_context *context = current->audit_context; |
7392906e AV |
2425 | context->mq_getsetattr.mqdes = mqdes; |
2426 | context->mq_getsetattr.mqstat = *mqstat; | |
2427 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2428 | } |
2429 | ||
b0dd25a8 | 2430 | /** |
073115d6 SG |
2431 | * audit_ipc_obj - record audit data for ipc object |
2432 | * @ipcp: ipc permissions | |
2433 | * | |
073115d6 | 2434 | */ |
a33e6751 | 2435 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2436 | { |
073115d6 | 2437 | struct audit_context *context = current->audit_context; |
a33e6751 AV |
2438 | context->ipc.uid = ipcp->uid; |
2439 | context->ipc.gid = ipcp->gid; | |
2440 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2441 | context->ipc.has_perm = 0; |
a33e6751 AV |
2442 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2443 | context->type = AUDIT_IPC; | |
073115d6 SG |
2444 | } |
2445 | ||
2446 | /** | |
2447 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
2448 | * @qbytes: msgq bytes |
2449 | * @uid: msgq user id | |
2450 | * @gid: msgq group id | |
2451 | * @mode: msgq mode (permissions) | |
2452 | * | |
e816f370 | 2453 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2454 | */ |
2570ebbd | 2455 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2456 | { |
1da177e4 LT |
2457 | struct audit_context *context = current->audit_context; |
2458 | ||
e816f370 AV |
2459 | context->ipc.qbytes = qbytes; |
2460 | context->ipc.perm_uid = uid; | |
2461 | context->ipc.perm_gid = gid; | |
2462 | context->ipc.perm_mode = mode; | |
2463 | context->ipc.has_perm = 1; | |
1da177e4 | 2464 | } |
c2f0c7c3 | 2465 | |
07c49417 | 2466 | int __audit_bprm(struct linux_binprm *bprm) |
473ae30b AV |
2467 | { |
2468 | struct audit_aux_data_execve *ax; | |
2469 | struct audit_context *context = current->audit_context; | |
473ae30b | 2470 | |
bdf4c48a | 2471 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); |
473ae30b AV |
2472 | if (!ax) |
2473 | return -ENOMEM; | |
2474 | ||
2475 | ax->argc = bprm->argc; | |
2476 | ax->envc = bprm->envc; | |
bdf4c48a | 2477 | ax->mm = bprm->mm; |
473ae30b AV |
2478 | ax->d.type = AUDIT_EXECVE; |
2479 | ax->d.next = context->aux; | |
2480 | context->aux = (void *)ax; | |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | ||
b0dd25a8 RD |
2485 | /** |
2486 | * audit_socketcall - record audit data for sys_socketcall | |
2487 | * @nargs: number of args | |
2488 | * @args: args array | |
2489 | * | |
b0dd25a8 | 2490 | */ |
07c49417 | 2491 | void __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2492 | { |
3ec3b2fb DW |
2493 | struct audit_context *context = current->audit_context; |
2494 | ||
f3298dc4 AV |
2495 | context->type = AUDIT_SOCKETCALL; |
2496 | context->socketcall.nargs = nargs; | |
2497 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
3ec3b2fb DW |
2498 | } |
2499 | ||
db349509 AV |
2500 | /** |
2501 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2502 | * @fd1: the first file descriptor | |
2503 | * @fd2: the second file descriptor | |
2504 | * | |
db349509 | 2505 | */ |
157cf649 | 2506 | void __audit_fd_pair(int fd1, int fd2) |
db349509 AV |
2507 | { |
2508 | struct audit_context *context = current->audit_context; | |
157cf649 AV |
2509 | context->fds[0] = fd1; |
2510 | context->fds[1] = fd2; | |
db349509 AV |
2511 | } |
2512 | ||
b0dd25a8 RD |
2513 | /** |
2514 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
2515 | * @len: data length in user space | |
2516 | * @a: data address in kernel space | |
2517 | * | |
2518 | * Returns 0 for success or NULL context or < 0 on error. | |
2519 | */ | |
07c49417 | 2520 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2521 | { |
3ec3b2fb DW |
2522 | struct audit_context *context = current->audit_context; |
2523 | ||
4f6b434f AV |
2524 | if (!context->sockaddr) { |
2525 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2526 | if (!p) | |
2527 | return -ENOMEM; | |
2528 | context->sockaddr = p; | |
2529 | } | |
3ec3b2fb | 2530 | |
4f6b434f AV |
2531 | context->sockaddr_len = len; |
2532 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2533 | return 0; |
2534 | } | |
2535 | ||
a5cb013d AV |
2536 | void __audit_ptrace(struct task_struct *t) |
2537 | { | |
2538 | struct audit_context *context = current->audit_context; | |
2539 | ||
2540 | context->target_pid = t->pid; | |
c2a7780e | 2541 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2542 | context->target_uid = task_uid(t); |
4746ec5b | 2543 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2544 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2545 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2546 | } |
2547 | ||
b0dd25a8 RD |
2548 | /** |
2549 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2550 | * @sig: signal value | |
2551 | * @t: task being signaled | |
2552 | * | |
2553 | * If the audit subsystem is being terminated, record the task (pid) | |
2554 | * and uid that is doing that. | |
2555 | */ | |
e54dc243 | 2556 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2557 | { |
e54dc243 AG |
2558 | struct audit_aux_data_pids *axp; |
2559 | struct task_struct *tsk = current; | |
2560 | struct audit_context *ctx = tsk->audit_context; | |
cca080d9 | 2561 | kuid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065 | 2562 | |
175fc484 | 2563 | if (audit_pid && t->tgid == audit_pid) { |
ee1d3156 | 2564 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
175fc484 | 2565 | audit_sig_pid = tsk->pid; |
e1760bd5 | 2566 | if (uid_valid(tsk->loginuid)) |
bfef93a5 | 2567 | audit_sig_uid = tsk->loginuid; |
175fc484 | 2568 | else |
c69e8d9c | 2569 | audit_sig_uid = uid; |
2a862b32 | 2570 | security_task_getsecid(tsk, &audit_sig_sid); |
175fc484 AV |
2571 | } |
2572 | if (!audit_signals || audit_dummy_context()) | |
2573 | return 0; | |
c2f0c7c3 | 2574 | } |
e54dc243 | 2575 | |
e54dc243 AG |
2576 | /* optimize the common case by putting first signal recipient directly |
2577 | * in audit_context */ | |
2578 | if (!ctx->target_pid) { | |
2579 | ctx->target_pid = t->tgid; | |
c2a7780e | 2580 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2581 | ctx->target_uid = t_uid; |
4746ec5b | 2582 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2583 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2584 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2585 | return 0; |
2586 | } | |
2587 | ||
2588 | axp = (void *)ctx->aux_pids; | |
2589 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2590 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2591 | if (!axp) | |
2592 | return -ENOMEM; | |
2593 | ||
2594 | axp->d.type = AUDIT_OBJ_PID; | |
2595 | axp->d.next = ctx->aux_pids; | |
2596 | ctx->aux_pids = (void *)axp; | |
2597 | } | |
88ae704c | 2598 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2599 | |
2600 | axp->target_pid[axp->pid_count] = t->tgid; | |
c2a7780e | 2601 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2602 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2603 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2604 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2605 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2606 | axp->pid_count++; |
2607 | ||
2608 | return 0; | |
c2f0c7c3 | 2609 | } |
0a4ff8c2 | 2610 | |
3fc689e9 EP |
2611 | /** |
2612 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2613 | * @bprm: pointer to the bprm being processed |
2614 | * @new: the proposed new credentials | |
2615 | * @old: the old credentials | |
3fc689e9 EP |
2616 | * |
2617 | * Simply check if the proc already has the caps given by the file and if not | |
2618 | * store the priv escalation info for later auditing at the end of the syscall | |
2619 | * | |
3fc689e9 EP |
2620 | * -Eric |
2621 | */ | |
d84f4f99 DH |
2622 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2623 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2624 | { |
2625 | struct audit_aux_data_bprm_fcaps *ax; | |
2626 | struct audit_context *context = current->audit_context; | |
2627 | struct cpu_vfs_cap_data vcaps; | |
2628 | struct dentry *dentry; | |
2629 | ||
2630 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2631 | if (!ax) | |
d84f4f99 | 2632 | return -ENOMEM; |
3fc689e9 EP |
2633 | |
2634 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2635 | ax->d.next = context->aux; | |
2636 | context->aux = (void *)ax; | |
2637 | ||
2638 | dentry = dget(bprm->file->f_dentry); | |
2639 | get_vfs_caps_from_disk(dentry, &vcaps); | |
2640 | dput(dentry); | |
2641 | ||
2642 | ax->fcap.permitted = vcaps.permitted; | |
2643 | ax->fcap.inheritable = vcaps.inheritable; | |
2644 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2645 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2646 | ||
d84f4f99 DH |
2647 | ax->old_pcap.permitted = old->cap_permitted; |
2648 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2649 | ax->old_pcap.effective = old->cap_effective; | |
3fc689e9 | 2650 | |
d84f4f99 DH |
2651 | ax->new_pcap.permitted = new->cap_permitted; |
2652 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2653 | ax->new_pcap.effective = new->cap_effective; | |
2654 | return 0; | |
3fc689e9 EP |
2655 | } |
2656 | ||
e68b75a0 EP |
2657 | /** |
2658 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2659 | * @pid: target pid of the capset call |
2660 | * @new: the new credentials | |
2661 | * @old: the old (current) credentials | |
e68b75a0 EP |
2662 | * |
2663 | * Record the aguments userspace sent to sys_capset for later printing by the | |
2664 | * audit system if applicable | |
2665 | */ | |
57f71a0a | 2666 | void __audit_log_capset(pid_t pid, |
d84f4f99 | 2667 | const struct cred *new, const struct cred *old) |
e68b75a0 | 2668 | { |
e68b75a0 | 2669 | struct audit_context *context = current->audit_context; |
57f71a0a AV |
2670 | context->capset.pid = pid; |
2671 | context->capset.cap.effective = new->cap_effective; | |
2672 | context->capset.cap.inheritable = new->cap_effective; | |
2673 | context->capset.cap.permitted = new->cap_permitted; | |
2674 | context->type = AUDIT_CAPSET; | |
e68b75a0 EP |
2675 | } |
2676 | ||
120a795d AV |
2677 | void __audit_mmap_fd(int fd, int flags) |
2678 | { | |
2679 | struct audit_context *context = current->audit_context; | |
2680 | context->mmap.fd = fd; | |
2681 | context->mmap.flags = flags; | |
2682 | context->type = AUDIT_MMAP; | |
2683 | } | |
2684 | ||
85e7bac3 EP |
2685 | static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr) |
2686 | { | |
cca080d9 EB |
2687 | kuid_t auid, uid; |
2688 | kgid_t gid; | |
85e7bac3 EP |
2689 | unsigned int sessionid; |
2690 | ||
2691 | auid = audit_get_loginuid(current); | |
2692 | sessionid = audit_get_sessionid(current); | |
2693 | current_uid_gid(&uid, &gid); | |
2694 | ||
2695 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
cca080d9 EB |
2696 | from_kuid(&init_user_ns, auid), |
2697 | from_kuid(&init_user_ns, uid), | |
2698 | from_kgid(&init_user_ns, gid), | |
2699 | sessionid); | |
85e7bac3 EP |
2700 | audit_log_task_context(ab); |
2701 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2702 | audit_log_untrustedstring(ab, current->comm); | |
2703 | audit_log_format(ab, " reason="); | |
2704 | audit_log_string(ab, reason); | |
2705 | audit_log_format(ab, " sig=%ld", signr); | |
2706 | } | |
0a4ff8c2 SG |
2707 | /** |
2708 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2709 | * @signr: signal value |
0a4ff8c2 SG |
2710 | * |
2711 | * If a process ends with a core dump, something fishy is going on and we | |
2712 | * should record the event for investigation. | |
2713 | */ | |
2714 | void audit_core_dumps(long signr) | |
2715 | { | |
2716 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2717 | |
2718 | if (!audit_enabled) | |
2719 | return; | |
2720 | ||
2721 | if (signr == SIGQUIT) /* don't care for those */ | |
2722 | return; | |
2723 | ||
2724 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
85e7bac3 EP |
2725 | audit_log_abend(ab, "memory violation", signr); |
2726 | audit_log_end(ab); | |
2727 | } | |
0a4ff8c2 | 2728 | |
3dc1c1b2 | 2729 | void __audit_seccomp(unsigned long syscall, long signr, int code) |
85e7bac3 EP |
2730 | { |
2731 | struct audit_buffer *ab; | |
2732 | ||
2733 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
3dc1c1b2 | 2734 | audit_log_abend(ab, "seccomp", signr); |
85e7bac3 | 2735 | audit_log_format(ab, " syscall=%ld", syscall); |
3dc1c1b2 KC |
2736 | audit_log_format(ab, " compat=%d", is_compat_task()); |
2737 | audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current)); | |
2738 | audit_log_format(ab, " code=0x%x", code); | |
0a4ff8c2 SG |
2739 | audit_log_end(ab); |
2740 | } | |
916d7576 AV |
2741 | |
2742 | struct list_head *audit_killed_trees(void) | |
2743 | { | |
2744 | struct audit_context *ctx = current->audit_context; | |
2745 | if (likely(!ctx || !ctx->in_syscall)) | |
2746 | return NULL; | |
2747 | return &ctx->killed_trees; | |
2748 | } |