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> |
1da177e4 | 70 | |
fe7752ba | 71 | #include "audit.h" |
1da177e4 | 72 | |
d7e7528b EP |
73 | /* flags stating the success for a syscall */ |
74 | #define AUDITSC_INVALID 0 | |
75 | #define AUDITSC_SUCCESS 1 | |
76 | #define AUDITSC_FAILURE 2 | |
77 | ||
1da177e4 | 78 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
5195d8e2 EP |
79 | * for saving names from getname(). If we get more names we will allocate |
80 | * a name dynamically and also add those to the list anchored by names_list. */ | |
81 | #define AUDIT_NAMES 5 | |
1da177e4 | 82 | |
9c937dcc AG |
83 | /* Indicates that audit should log the full pathname. */ |
84 | #define AUDIT_NAME_FULL -1 | |
85 | ||
de6bbd1d EP |
86 | /* no execve audit message should be longer than this (userspace limits) */ |
87 | #define MAX_EXECVE_AUDIT_LEN 7500 | |
88 | ||
471a5c7c AV |
89 | /* number of audit rules */ |
90 | int audit_n_rules; | |
91 | ||
e54dc243 AG |
92 | /* determines whether we collect data for signals sent */ |
93 | int audit_signals; | |
94 | ||
851f7ff5 EP |
95 | struct audit_cap_data { |
96 | kernel_cap_t permitted; | |
97 | kernel_cap_t inheritable; | |
98 | union { | |
99 | unsigned int fE; /* effective bit of a file capability */ | |
100 | kernel_cap_t effective; /* effective set of a process */ | |
101 | }; | |
102 | }; | |
103 | ||
1da177e4 LT |
104 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
105 | * we don't let putname() free it (instead we free all of the saved | |
106 | * pointers at syscall exit time). | |
107 | * | |
108 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
109 | struct audit_names { | |
5195d8e2 | 110 | struct list_head list; /* audit_context->names_list */ |
1da177e4 LT |
111 | const char *name; |
112 | unsigned long ino; | |
113 | dev_t dev; | |
114 | umode_t mode; | |
115 | uid_t uid; | |
116 | gid_t gid; | |
117 | dev_t rdev; | |
1b50eed9 | 118 | u32 osid; |
851f7ff5 EP |
119 | struct audit_cap_data fcap; |
120 | unsigned int fcap_ver; | |
5195d8e2 EP |
121 | int name_len; /* number of name's characters to log */ |
122 | bool name_put; /* call __putname() for this name */ | |
123 | /* | |
124 | * This was an allocated audit_names and not from the array of | |
125 | * names allocated in the task audit context. Thus this name | |
126 | * should be freed on syscall exit | |
127 | */ | |
128 | bool should_free; | |
1da177e4 LT |
129 | }; |
130 | ||
131 | struct audit_aux_data { | |
132 | struct audit_aux_data *next; | |
133 | int type; | |
134 | }; | |
135 | ||
136 | #define AUDIT_AUX_IPCPERM 0 | |
137 | ||
e54dc243 AG |
138 | /* Number of target pids per aux struct. */ |
139 | #define AUDIT_AUX_PIDS 16 | |
140 | ||
473ae30b AV |
141 | struct audit_aux_data_execve { |
142 | struct audit_aux_data d; | |
143 | int argc; | |
144 | int envc; | |
bdf4c48a | 145 | struct mm_struct *mm; |
473ae30b AV |
146 | }; |
147 | ||
e54dc243 AG |
148 | struct audit_aux_data_pids { |
149 | struct audit_aux_data d; | |
150 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
c2a7780e EP |
151 | uid_t target_auid[AUDIT_AUX_PIDS]; |
152 | uid_t target_uid[AUDIT_AUX_PIDS]; | |
4746ec5b | 153 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 154 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 155 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
156 | int pid_count; |
157 | }; | |
158 | ||
3fc689e9 EP |
159 | struct audit_aux_data_bprm_fcaps { |
160 | struct audit_aux_data d; | |
161 | struct audit_cap_data fcap; | |
162 | unsigned int fcap_ver; | |
163 | struct audit_cap_data old_pcap; | |
164 | struct audit_cap_data new_pcap; | |
165 | }; | |
166 | ||
e68b75a0 EP |
167 | struct audit_aux_data_capset { |
168 | struct audit_aux_data d; | |
169 | pid_t pid; | |
170 | struct audit_cap_data cap; | |
171 | }; | |
172 | ||
74c3cbe3 AV |
173 | struct audit_tree_refs { |
174 | struct audit_tree_refs *next; | |
175 | struct audit_chunk *c[31]; | |
176 | }; | |
177 | ||
1da177e4 LT |
178 | /* The per-task audit context. */ |
179 | struct audit_context { | |
d51374ad | 180 | int dummy; /* must be the first element */ |
1da177e4 | 181 | int in_syscall; /* 1 if task is in a syscall */ |
0590b933 | 182 | enum audit_state state, current_state; |
1da177e4 | 183 | unsigned int serial; /* serial number for record */ |
1da177e4 | 184 | int major; /* syscall number */ |
44e51a1b | 185 | struct timespec ctime; /* time of syscall entry */ |
1da177e4 | 186 | unsigned long argv[4]; /* syscall arguments */ |
2fd6f58b | 187 | long return_code;/* syscall return code */ |
0590b933 | 188 | u64 prio; |
44e51a1b | 189 | int return_valid; /* return code is valid */ |
5195d8e2 EP |
190 | /* |
191 | * The names_list is the list of all audit_names collected during this | |
192 | * syscall. The first AUDIT_NAMES entries in the names_list will | |
193 | * actually be from the preallocated_names array for performance | |
194 | * reasons. Except during allocation they should never be referenced | |
195 | * through the preallocated_names array and should only be found/used | |
196 | * by running the names_list. | |
197 | */ | |
198 | struct audit_names preallocated_names[AUDIT_NAMES]; | |
199 | int name_count; /* total records in names_list */ | |
200 | struct list_head names_list; /* anchor for struct audit_names->list */ | |
5adc8a6a | 201 | char * filterkey; /* key for rule that triggered record */ |
44707fdf | 202 | struct path pwd; |
1da177e4 LT |
203 | struct audit_context *previous; /* For nested syscalls */ |
204 | struct audit_aux_data *aux; | |
e54dc243 | 205 | struct audit_aux_data *aux_pids; |
4f6b434f AV |
206 | struct sockaddr_storage *sockaddr; |
207 | size_t sockaddr_len; | |
1da177e4 | 208 | /* Save things to print about task_struct */ |
f46038ff | 209 | pid_t pid, ppid; |
1da177e4 LT |
210 | uid_t uid, euid, suid, fsuid; |
211 | gid_t gid, egid, sgid, fsgid; | |
212 | unsigned long personality; | |
2fd6f58b | 213 | int arch; |
1da177e4 | 214 | |
a5cb013d | 215 | pid_t target_pid; |
c2a7780e EP |
216 | uid_t target_auid; |
217 | uid_t target_uid; | |
4746ec5b | 218 | unsigned int target_sessionid; |
a5cb013d | 219 | u32 target_sid; |
c2a7780e | 220 | char target_comm[TASK_COMM_LEN]; |
a5cb013d | 221 | |
74c3cbe3 | 222 | struct audit_tree_refs *trees, *first_trees; |
916d7576 | 223 | struct list_head killed_trees; |
44e51a1b | 224 | int tree_count; |
74c3cbe3 | 225 | |
f3298dc4 AV |
226 | int type; |
227 | union { | |
228 | struct { | |
229 | int nargs; | |
230 | long args[6]; | |
231 | } socketcall; | |
a33e6751 AV |
232 | struct { |
233 | uid_t uid; | |
234 | gid_t gid; | |
2570ebbd | 235 | umode_t mode; |
a33e6751 | 236 | u32 osid; |
e816f370 AV |
237 | int has_perm; |
238 | uid_t perm_uid; | |
239 | gid_t perm_gid; | |
2570ebbd | 240 | umode_t perm_mode; |
e816f370 | 241 | unsigned long qbytes; |
a33e6751 | 242 | } ipc; |
7392906e AV |
243 | struct { |
244 | mqd_t mqdes; | |
245 | struct mq_attr mqstat; | |
246 | } mq_getsetattr; | |
20114f71 AV |
247 | struct { |
248 | mqd_t mqdes; | |
249 | int sigev_signo; | |
250 | } mq_notify; | |
c32c8af4 AV |
251 | struct { |
252 | mqd_t mqdes; | |
253 | size_t msg_len; | |
254 | unsigned int msg_prio; | |
255 | struct timespec abs_timeout; | |
256 | } mq_sendrecv; | |
564f6993 AV |
257 | struct { |
258 | int oflag; | |
df0a4283 | 259 | umode_t mode; |
564f6993 AV |
260 | struct mq_attr attr; |
261 | } mq_open; | |
57f71a0a AV |
262 | struct { |
263 | pid_t pid; | |
264 | struct audit_cap_data cap; | |
265 | } capset; | |
120a795d AV |
266 | struct { |
267 | int fd; | |
268 | int flags; | |
269 | } mmap; | |
f3298dc4 | 270 | }; |
157cf649 | 271 | int fds[2]; |
f3298dc4 | 272 | |
1da177e4 LT |
273 | #if AUDIT_DEBUG |
274 | int put_count; | |
275 | int ino_count; | |
276 | #endif | |
277 | }; | |
278 | ||
55669bfa AV |
279 | static inline int open_arg(int flags, int mask) |
280 | { | |
281 | int n = ACC_MODE(flags); | |
282 | if (flags & (O_TRUNC | O_CREAT)) | |
283 | n |= AUDIT_PERM_WRITE; | |
284 | return n & mask; | |
285 | } | |
286 | ||
287 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
288 | { | |
c4bacefb | 289 | unsigned n; |
1a61c88d | 290 | if (unlikely(!ctx)) |
291 | return 0; | |
c4bacefb | 292 | n = ctx->major; |
dbda4c0b | 293 | |
55669bfa AV |
294 | switch (audit_classify_syscall(ctx->arch, n)) { |
295 | case 0: /* native */ | |
296 | if ((mask & AUDIT_PERM_WRITE) && | |
297 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
298 | return 1; | |
299 | if ((mask & AUDIT_PERM_READ) && | |
300 | audit_match_class(AUDIT_CLASS_READ, n)) | |
301 | return 1; | |
302 | if ((mask & AUDIT_PERM_ATTR) && | |
303 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
304 | return 1; | |
305 | return 0; | |
306 | case 1: /* 32bit on biarch */ | |
307 | if ((mask & AUDIT_PERM_WRITE) && | |
308 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
309 | return 1; | |
310 | if ((mask & AUDIT_PERM_READ) && | |
311 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
312 | return 1; | |
313 | if ((mask & AUDIT_PERM_ATTR) && | |
314 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
315 | return 1; | |
316 | return 0; | |
317 | case 2: /* open */ | |
318 | return mask & ACC_MODE(ctx->argv[1]); | |
319 | case 3: /* openat */ | |
320 | return mask & ACC_MODE(ctx->argv[2]); | |
321 | case 4: /* socketcall */ | |
322 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
323 | case 5: /* execve */ | |
324 | return mask & AUDIT_PERM_EXEC; | |
325 | default: | |
326 | return 0; | |
327 | } | |
328 | } | |
329 | ||
5ef30ee5 | 330 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 331 | { |
5195d8e2 | 332 | struct audit_names *n; |
5ef30ee5 | 333 | umode_t mode = (umode_t)val; |
1a61c88d | 334 | |
335 | if (unlikely(!ctx)) | |
336 | return 0; | |
337 | ||
5195d8e2 EP |
338 | list_for_each_entry(n, &ctx->names_list, list) { |
339 | if ((n->ino != -1) && | |
340 | ((n->mode & S_IFMT) == mode)) | |
5ef30ee5 EP |
341 | return 1; |
342 | } | |
5195d8e2 | 343 | |
5ef30ee5 | 344 | return 0; |
8b67dca9 AV |
345 | } |
346 | ||
74c3cbe3 AV |
347 | /* |
348 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
349 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
350 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
351 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
352 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
353 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
354 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
355 | */ | |
356 | ||
357 | #ifdef CONFIG_AUDIT_TREE | |
679173b7 EP |
358 | static void audit_set_auditable(struct audit_context *ctx) |
359 | { | |
360 | if (!ctx->prio) { | |
361 | ctx->prio = 1; | |
362 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
363 | } | |
364 | } | |
365 | ||
74c3cbe3 AV |
366 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
367 | { | |
368 | struct audit_tree_refs *p = ctx->trees; | |
369 | int left = ctx->tree_count; | |
370 | if (likely(left)) { | |
371 | p->c[--left] = chunk; | |
372 | ctx->tree_count = left; | |
373 | return 1; | |
374 | } | |
375 | if (!p) | |
376 | return 0; | |
377 | p = p->next; | |
378 | if (p) { | |
379 | p->c[30] = chunk; | |
380 | ctx->trees = p; | |
381 | ctx->tree_count = 30; | |
382 | return 1; | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int grow_tree_refs(struct audit_context *ctx) | |
388 | { | |
389 | struct audit_tree_refs *p = ctx->trees; | |
390 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
391 | if (!ctx->trees) { | |
392 | ctx->trees = p; | |
393 | return 0; | |
394 | } | |
395 | if (p) | |
396 | p->next = ctx->trees; | |
397 | else | |
398 | ctx->first_trees = ctx->trees; | |
399 | ctx->tree_count = 31; | |
400 | return 1; | |
401 | } | |
402 | #endif | |
403 | ||
404 | static void unroll_tree_refs(struct audit_context *ctx, | |
405 | struct audit_tree_refs *p, int count) | |
406 | { | |
407 | #ifdef CONFIG_AUDIT_TREE | |
408 | struct audit_tree_refs *q; | |
409 | int n; | |
410 | if (!p) { | |
411 | /* we started with empty chain */ | |
412 | p = ctx->first_trees; | |
413 | count = 31; | |
414 | /* if the very first allocation has failed, nothing to do */ | |
415 | if (!p) | |
416 | return; | |
417 | } | |
418 | n = count; | |
419 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
420 | while (n--) { | |
421 | audit_put_chunk(q->c[n]); | |
422 | q->c[n] = NULL; | |
423 | } | |
424 | } | |
425 | while (n-- > ctx->tree_count) { | |
426 | audit_put_chunk(q->c[n]); | |
427 | q->c[n] = NULL; | |
428 | } | |
429 | ctx->trees = p; | |
430 | ctx->tree_count = count; | |
431 | #endif | |
432 | } | |
433 | ||
434 | static void free_tree_refs(struct audit_context *ctx) | |
435 | { | |
436 | struct audit_tree_refs *p, *q; | |
437 | for (p = ctx->first_trees; p; p = q) { | |
438 | q = p->next; | |
439 | kfree(p); | |
440 | } | |
441 | } | |
442 | ||
443 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
444 | { | |
445 | #ifdef CONFIG_AUDIT_TREE | |
446 | struct audit_tree_refs *p; | |
447 | int n; | |
448 | if (!tree) | |
449 | return 0; | |
450 | /* full ones */ | |
451 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
452 | for (n = 0; n < 31; n++) | |
453 | if (audit_tree_match(p->c[n], tree)) | |
454 | return 1; | |
455 | } | |
456 | /* partial */ | |
457 | if (p) { | |
458 | for (n = ctx->tree_count; n < 31; n++) | |
459 | if (audit_tree_match(p->c[n], tree)) | |
460 | return 1; | |
461 | } | |
462 | #endif | |
463 | return 0; | |
464 | } | |
465 | ||
b34b0393 EP |
466 | static int audit_compare_id(uid_t uid1, |
467 | struct audit_names *name, | |
468 | unsigned long name_offset, | |
469 | struct audit_field *f, | |
470 | struct audit_context *ctx) | |
471 | { | |
472 | struct audit_names *n; | |
473 | unsigned long addr; | |
474 | uid_t uid2; | |
475 | int rc; | |
476 | ||
c9fe685f EP |
477 | BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); |
478 | ||
b34b0393 EP |
479 | if (name) { |
480 | addr = (unsigned long)name; | |
481 | addr += name_offset; | |
482 | ||
483 | uid2 = *(uid_t *)addr; | |
484 | rc = audit_comparator(uid1, f->op, uid2); | |
485 | if (rc) | |
486 | return rc; | |
487 | } | |
488 | ||
489 | if (ctx) { | |
490 | list_for_each_entry(n, &ctx->names_list, list) { | |
491 | addr = (unsigned long)n; | |
492 | addr += name_offset; | |
493 | ||
494 | uid2 = *(uid_t *)addr; | |
495 | ||
496 | rc = audit_comparator(uid1, f->op, uid2); | |
497 | if (rc) | |
498 | return rc; | |
499 | } | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | ||
02d86a56 EP |
504 | static int audit_field_compare(struct task_struct *tsk, |
505 | const struct cred *cred, | |
506 | struct audit_field *f, | |
507 | struct audit_context *ctx, | |
508 | struct audit_names *name) | |
509 | { | |
02d86a56 | 510 | switch (f->val) { |
4a6633ed | 511 | /* process to file object comparisons */ |
02d86a56 | 512 | case AUDIT_COMPARE_UID_TO_OBJ_UID: |
b34b0393 EP |
513 | return audit_compare_id(cred->uid, |
514 | name, offsetof(struct audit_names, uid), | |
515 | f, ctx); | |
c9fe685f EP |
516 | case AUDIT_COMPARE_GID_TO_OBJ_GID: |
517 | return audit_compare_id(cred->gid, | |
518 | name, offsetof(struct audit_names, gid), | |
519 | f, ctx); | |
4a6633ed PM |
520 | case AUDIT_COMPARE_EUID_TO_OBJ_UID: |
521 | return audit_compare_id(cred->euid, | |
522 | name, offsetof(struct audit_names, uid), | |
523 | f, ctx); | |
524 | case AUDIT_COMPARE_EGID_TO_OBJ_GID: | |
525 | return audit_compare_id(cred->egid, | |
526 | name, offsetof(struct audit_names, gid), | |
527 | f, ctx); | |
528 | case AUDIT_COMPARE_AUID_TO_OBJ_UID: | |
529 | return audit_compare_id(tsk->loginuid, | |
530 | name, offsetof(struct audit_names, uid), | |
531 | f, ctx); | |
532 | case AUDIT_COMPARE_SUID_TO_OBJ_UID: | |
533 | return audit_compare_id(cred->suid, | |
534 | name, offsetof(struct audit_names, uid), | |
535 | f, ctx); | |
536 | case AUDIT_COMPARE_SGID_TO_OBJ_GID: | |
537 | return audit_compare_id(cred->sgid, | |
538 | name, offsetof(struct audit_names, gid), | |
539 | f, ctx); | |
540 | case AUDIT_COMPARE_FSUID_TO_OBJ_UID: | |
541 | return audit_compare_id(cred->fsuid, | |
542 | name, offsetof(struct audit_names, uid), | |
543 | f, ctx); | |
544 | case AUDIT_COMPARE_FSGID_TO_OBJ_GID: | |
545 | return audit_compare_id(cred->fsgid, | |
546 | name, offsetof(struct audit_names, gid), | |
547 | f, ctx); | |
10d68360 PM |
548 | /* uid comparisons */ |
549 | case AUDIT_COMPARE_UID_TO_AUID: | |
550 | return audit_comparator(cred->uid, f->op, tsk->loginuid); | |
551 | case AUDIT_COMPARE_UID_TO_EUID: | |
552 | return audit_comparator(cred->uid, f->op, cred->euid); | |
553 | case AUDIT_COMPARE_UID_TO_SUID: | |
554 | return audit_comparator(cred->uid, f->op, cred->suid); | |
555 | case AUDIT_COMPARE_UID_TO_FSUID: | |
556 | return audit_comparator(cred->uid, f->op, cred->fsuid); | |
557 | /* auid comparisons */ | |
558 | case AUDIT_COMPARE_AUID_TO_EUID: | |
559 | return audit_comparator(tsk->loginuid, f->op, cred->euid); | |
560 | case AUDIT_COMPARE_AUID_TO_SUID: | |
561 | return audit_comparator(tsk->loginuid, f->op, cred->suid); | |
562 | case AUDIT_COMPARE_AUID_TO_FSUID: | |
563 | return audit_comparator(tsk->loginuid, f->op, cred->fsuid); | |
564 | /* euid comparisons */ | |
565 | case AUDIT_COMPARE_EUID_TO_SUID: | |
566 | return audit_comparator(cred->euid, f->op, cred->suid); | |
567 | case AUDIT_COMPARE_EUID_TO_FSUID: | |
568 | return audit_comparator(cred->euid, f->op, cred->fsuid); | |
569 | /* suid comparisons */ | |
570 | case AUDIT_COMPARE_SUID_TO_FSUID: | |
571 | return audit_comparator(cred->suid, f->op, cred->fsuid); | |
572 | /* gid comparisons */ | |
573 | case AUDIT_COMPARE_GID_TO_EGID: | |
574 | return audit_comparator(cred->gid, f->op, cred->egid); | |
575 | case AUDIT_COMPARE_GID_TO_SGID: | |
576 | return audit_comparator(cred->gid, f->op, cred->sgid); | |
577 | case AUDIT_COMPARE_GID_TO_FSGID: | |
578 | return audit_comparator(cred->gid, f->op, cred->fsgid); | |
579 | /* egid comparisons */ | |
580 | case AUDIT_COMPARE_EGID_TO_SGID: | |
581 | return audit_comparator(cred->egid, f->op, cred->sgid); | |
582 | case AUDIT_COMPARE_EGID_TO_FSGID: | |
583 | return audit_comparator(cred->egid, f->op, cred->fsgid); | |
584 | /* sgid comparison */ | |
585 | case AUDIT_COMPARE_SGID_TO_FSGID: | |
586 | return audit_comparator(cred->sgid, f->op, cred->fsgid); | |
02d86a56 EP |
587 | default: |
588 | WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n"); | |
589 | return 0; | |
590 | } | |
591 | return 0; | |
592 | } | |
593 | ||
f368c07d | 594 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 595 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
596 | * otherwise. |
597 | * | |
598 | * If task_creation is true, this is an explicit indication that we are | |
599 | * filtering a task rule at task creation time. This and tsk == current are | |
600 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
601 | */ | |
1da177e4 | 602 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 603 | struct audit_krule *rule, |
1da177e4 | 604 | struct audit_context *ctx, |
f368c07d | 605 | struct audit_names *name, |
f5629883 TJ |
606 | enum audit_state *state, |
607 | bool task_creation) | |
1da177e4 | 608 | { |
f5629883 | 609 | const struct cred *cred; |
5195d8e2 | 610 | int i, need_sid = 1; |
3dc7e315 DG |
611 | u32 sid; |
612 | ||
f5629883 TJ |
613 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
614 | ||
1da177e4 | 615 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 616 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 617 | struct audit_names *n; |
1da177e4 LT |
618 | int result = 0; |
619 | ||
93315ed6 | 620 | switch (f->type) { |
1da177e4 | 621 | case AUDIT_PID: |
93315ed6 | 622 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 623 | break; |
3c66251e | 624 | case AUDIT_PPID: |
419c58f1 AV |
625 | if (ctx) { |
626 | if (!ctx->ppid) | |
627 | ctx->ppid = sys_getppid(); | |
3c66251e | 628 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 629 | } |
3c66251e | 630 | break; |
1da177e4 | 631 | case AUDIT_UID: |
b6dff3ec | 632 | result = audit_comparator(cred->uid, f->op, f->val); |
1da177e4 LT |
633 | break; |
634 | case AUDIT_EUID: | |
b6dff3ec | 635 | result = audit_comparator(cred->euid, f->op, f->val); |
1da177e4 LT |
636 | break; |
637 | case AUDIT_SUID: | |
b6dff3ec | 638 | result = audit_comparator(cred->suid, f->op, f->val); |
1da177e4 LT |
639 | break; |
640 | case AUDIT_FSUID: | |
b6dff3ec | 641 | result = audit_comparator(cred->fsuid, f->op, f->val); |
1da177e4 LT |
642 | break; |
643 | case AUDIT_GID: | |
b6dff3ec | 644 | result = audit_comparator(cred->gid, f->op, f->val); |
1da177e4 LT |
645 | break; |
646 | case AUDIT_EGID: | |
b6dff3ec | 647 | result = audit_comparator(cred->egid, f->op, f->val); |
1da177e4 LT |
648 | break; |
649 | case AUDIT_SGID: | |
b6dff3ec | 650 | result = audit_comparator(cred->sgid, f->op, f->val); |
1da177e4 LT |
651 | break; |
652 | case AUDIT_FSGID: | |
b6dff3ec | 653 | result = audit_comparator(cred->fsgid, f->op, f->val); |
1da177e4 LT |
654 | break; |
655 | case AUDIT_PERS: | |
93315ed6 | 656 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 657 | break; |
2fd6f58b | 658 | case AUDIT_ARCH: |
9f8dbe9c | 659 | if (ctx) |
93315ed6 | 660 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 661 | break; |
1da177e4 LT |
662 | |
663 | case AUDIT_EXIT: | |
664 | if (ctx && ctx->return_valid) | |
93315ed6 | 665 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
666 | break; |
667 | case AUDIT_SUCCESS: | |
b01f2cc1 | 668 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
669 | if (f->val) |
670 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 671 | else |
93315ed6 | 672 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 673 | } |
1da177e4 LT |
674 | break; |
675 | case AUDIT_DEVMAJOR: | |
16c174bd EP |
676 | if (name) { |
677 | if (audit_comparator(MAJOR(name->dev), f->op, f->val) || | |
678 | audit_comparator(MAJOR(name->rdev), f->op, f->val)) | |
679 | ++result; | |
680 | } else if (ctx) { | |
5195d8e2 | 681 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
682 | if (audit_comparator(MAJOR(n->dev), f->op, f->val) || |
683 | audit_comparator(MAJOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
684 | ++result; |
685 | break; | |
686 | } | |
687 | } | |
688 | } | |
689 | break; | |
690 | case AUDIT_DEVMINOR: | |
16c174bd EP |
691 | if (name) { |
692 | if (audit_comparator(MINOR(name->dev), f->op, f->val) || | |
693 | audit_comparator(MINOR(name->rdev), f->op, f->val)) | |
694 | ++result; | |
695 | } else if (ctx) { | |
5195d8e2 | 696 | list_for_each_entry(n, &ctx->names_list, list) { |
16c174bd EP |
697 | if (audit_comparator(MINOR(n->dev), f->op, f->val) || |
698 | audit_comparator(MINOR(n->rdev), f->op, f->val)) { | |
1da177e4 LT |
699 | ++result; |
700 | break; | |
701 | } | |
702 | } | |
703 | } | |
704 | break; | |
705 | case AUDIT_INODE: | |
f368c07d | 706 | if (name) |
9c937dcc | 707 | result = (name->ino == f->val); |
f368c07d | 708 | else if (ctx) { |
5195d8e2 EP |
709 | list_for_each_entry(n, &ctx->names_list, list) { |
710 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
711 | ++result; |
712 | break; | |
713 | } | |
714 | } | |
715 | } | |
716 | break; | |
efaffd6e EP |
717 | case AUDIT_OBJ_UID: |
718 | if (name) { | |
719 | result = audit_comparator(name->uid, f->op, f->val); | |
720 | } else if (ctx) { | |
721 | list_for_each_entry(n, &ctx->names_list, list) { | |
722 | if (audit_comparator(n->uid, f->op, f->val)) { | |
723 | ++result; | |
724 | break; | |
725 | } | |
726 | } | |
727 | } | |
728 | break; | |
54d3218b EP |
729 | case AUDIT_OBJ_GID: |
730 | if (name) { | |
731 | result = audit_comparator(name->gid, f->op, f->val); | |
732 | } else if (ctx) { | |
733 | list_for_each_entry(n, &ctx->names_list, list) { | |
734 | if (audit_comparator(n->gid, f->op, f->val)) { | |
735 | ++result; | |
736 | break; | |
737 | } | |
738 | } | |
739 | } | |
740 | break; | |
f368c07d | 741 | case AUDIT_WATCH: |
ae7b8f41 EP |
742 | if (name) |
743 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 744 | break; |
74c3cbe3 AV |
745 | case AUDIT_DIR: |
746 | if (ctx) | |
747 | result = match_tree_refs(ctx, rule->tree); | |
748 | break; | |
1da177e4 LT |
749 | case AUDIT_LOGINUID: |
750 | result = 0; | |
751 | if (ctx) | |
bfef93a5 | 752 | result = audit_comparator(tsk->loginuid, f->op, f->val); |
1da177e4 | 753 | break; |
3a6b9f85 DG |
754 | case AUDIT_SUBJ_USER: |
755 | case AUDIT_SUBJ_ROLE: | |
756 | case AUDIT_SUBJ_TYPE: | |
757 | case AUDIT_SUBJ_SEN: | |
758 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
759 | /* NOTE: this may return negative values indicating |
760 | a temporary error. We simply treat this as a | |
761 | match for now to avoid losing information that | |
762 | may be wanted. An error message will also be | |
763 | logged upon error */ | |
04305e4a | 764 | if (f->lsm_rule) { |
2ad312d2 | 765 | if (need_sid) { |
2a862b32 | 766 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
767 | need_sid = 0; |
768 | } | |
d7a96f3a | 769 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 770 | f->op, |
04305e4a | 771 | f->lsm_rule, |
3dc7e315 | 772 | ctx); |
2ad312d2 | 773 | } |
3dc7e315 | 774 | break; |
6e5a2d1d DG |
775 | case AUDIT_OBJ_USER: |
776 | case AUDIT_OBJ_ROLE: | |
777 | case AUDIT_OBJ_TYPE: | |
778 | case AUDIT_OBJ_LEV_LOW: | |
779 | case AUDIT_OBJ_LEV_HIGH: | |
780 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
781 | also applies here */ | |
04305e4a | 782 | if (f->lsm_rule) { |
6e5a2d1d DG |
783 | /* Find files that match */ |
784 | if (name) { | |
d7a96f3a | 785 | result = security_audit_rule_match( |
6e5a2d1d | 786 | name->osid, f->type, f->op, |
04305e4a | 787 | f->lsm_rule, ctx); |
6e5a2d1d | 788 | } else if (ctx) { |
5195d8e2 EP |
789 | list_for_each_entry(n, &ctx->names_list, list) { |
790 | if (security_audit_rule_match(n->osid, f->type, | |
791 | f->op, f->lsm_rule, | |
792 | ctx)) { | |
6e5a2d1d DG |
793 | ++result; |
794 | break; | |
795 | } | |
796 | } | |
797 | } | |
798 | /* Find ipc objects that match */ | |
a33e6751 AV |
799 | if (!ctx || ctx->type != AUDIT_IPC) |
800 | break; | |
801 | if (security_audit_rule_match(ctx->ipc.osid, | |
802 | f->type, f->op, | |
803 | f->lsm_rule, ctx)) | |
804 | ++result; | |
6e5a2d1d DG |
805 | } |
806 | break; | |
1da177e4 LT |
807 | case AUDIT_ARG0: |
808 | case AUDIT_ARG1: | |
809 | case AUDIT_ARG2: | |
810 | case AUDIT_ARG3: | |
811 | if (ctx) | |
93315ed6 | 812 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 813 | break; |
5adc8a6a AG |
814 | case AUDIT_FILTERKEY: |
815 | /* ignore this field for filtering */ | |
816 | result = 1; | |
817 | break; | |
55669bfa AV |
818 | case AUDIT_PERM: |
819 | result = audit_match_perm(ctx, f->val); | |
820 | break; | |
8b67dca9 AV |
821 | case AUDIT_FILETYPE: |
822 | result = audit_match_filetype(ctx, f->val); | |
823 | break; | |
02d86a56 EP |
824 | case AUDIT_FIELD_COMPARE: |
825 | result = audit_field_compare(tsk, cred, f, ctx, name); | |
826 | break; | |
1da177e4 | 827 | } |
f5629883 | 828 | if (!result) |
1da177e4 LT |
829 | return 0; |
830 | } | |
0590b933 AV |
831 | |
832 | if (ctx) { | |
833 | if (rule->prio <= ctx->prio) | |
834 | return 0; | |
835 | if (rule->filterkey) { | |
836 | kfree(ctx->filterkey); | |
837 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
838 | } | |
839 | ctx->prio = rule->prio; | |
840 | } | |
1da177e4 LT |
841 | switch (rule->action) { |
842 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
843 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
844 | } | |
845 | return 1; | |
846 | } | |
847 | ||
848 | /* At process creation time, we can determine if system-call auditing is | |
849 | * completely disabled for this task. Since we only have the task | |
850 | * structure at this point, we can only check uid and gid. | |
851 | */ | |
e048e02c | 852 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
853 | { |
854 | struct audit_entry *e; | |
855 | enum audit_state state; | |
856 | ||
857 | rcu_read_lock(); | |
0f45aa18 | 858 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
859 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
860 | &state, true)) { | |
e048e02c AV |
861 | if (state == AUDIT_RECORD_CONTEXT) |
862 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
863 | rcu_read_unlock(); |
864 | return state; | |
865 | } | |
866 | } | |
867 | rcu_read_unlock(); | |
868 | return AUDIT_BUILD_CONTEXT; | |
869 | } | |
870 | ||
871 | /* At syscall entry and exit time, this filter is called if the | |
872 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 873 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 874 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
875 | */ |
876 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
877 | struct audit_context *ctx, | |
878 | struct list_head *list) | |
879 | { | |
880 | struct audit_entry *e; | |
c3896495 | 881 | enum audit_state state; |
1da177e4 | 882 | |
351bb722 | 883 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
884 | return AUDIT_DISABLED; |
885 | ||
1da177e4 | 886 | rcu_read_lock(); |
c3896495 | 887 | if (!list_empty(list)) { |
b63862f4 DK |
888 | int word = AUDIT_WORD(ctx->major); |
889 | int bit = AUDIT_BIT(ctx->major); | |
890 | ||
891 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
892 | if ((e->rule.mask[word] & bit) == bit && |
893 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
f5629883 | 894 | &state, false)) { |
f368c07d | 895 | rcu_read_unlock(); |
0590b933 | 896 | ctx->current_state = state; |
f368c07d AG |
897 | return state; |
898 | } | |
899 | } | |
900 | } | |
901 | rcu_read_unlock(); | |
902 | return AUDIT_BUILD_CONTEXT; | |
903 | } | |
904 | ||
5195d8e2 EP |
905 | /* |
906 | * Given an audit_name check the inode hash table to see if they match. | |
907 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
908 | */ | |
909 | static int audit_filter_inode_name(struct task_struct *tsk, | |
910 | struct audit_names *n, | |
911 | struct audit_context *ctx) { | |
912 | int word, bit; | |
913 | int h = audit_hash_ino((u32)n->ino); | |
914 | struct list_head *list = &audit_inode_hash[h]; | |
915 | struct audit_entry *e; | |
916 | enum audit_state state; | |
917 | ||
918 | word = AUDIT_WORD(ctx->major); | |
919 | bit = AUDIT_BIT(ctx->major); | |
920 | ||
921 | if (list_empty(list)) | |
922 | return 0; | |
923 | ||
924 | list_for_each_entry_rcu(e, list, list) { | |
925 | if ((e->rule.mask[word] & bit) == bit && | |
926 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { | |
927 | ctx->current_state = state; | |
928 | return 1; | |
929 | } | |
930 | } | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 936 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 937 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
938 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
939 | */ | |
0590b933 | 940 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 941 | { |
5195d8e2 | 942 | struct audit_names *n; |
f368c07d AG |
943 | |
944 | if (audit_pid && tsk->tgid == audit_pid) | |
0590b933 | 945 | return; |
f368c07d AG |
946 | |
947 | rcu_read_lock(); | |
f368c07d | 948 | |
5195d8e2 EP |
949 | list_for_each_entry(n, &ctx->names_list, list) { |
950 | if (audit_filter_inode_name(tsk, n, ctx)) | |
951 | break; | |
0f45aa18 DW |
952 | } |
953 | rcu_read_unlock(); | |
0f45aa18 DW |
954 | } |
955 | ||
1da177e4 LT |
956 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
957 | int return_valid, | |
6d208da8 | 958 | long return_code) |
1da177e4 LT |
959 | { |
960 | struct audit_context *context = tsk->audit_context; | |
961 | ||
56179a6e | 962 | if (!context) |
1da177e4 LT |
963 | return NULL; |
964 | context->return_valid = return_valid; | |
f701b75e EP |
965 | |
966 | /* | |
967 | * we need to fix up the return code in the audit logs if the actual | |
968 | * return codes are later going to be fixed up by the arch specific | |
969 | * signal handlers | |
970 | * | |
971 | * This is actually a test for: | |
972 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
973 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
974 | * | |
975 | * but is faster than a bunch of || | |
976 | */ | |
977 | if (unlikely(return_code <= -ERESTARTSYS) && | |
978 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
979 | (return_code != -ENOIOCTLCMD)) | |
980 | context->return_code = -EINTR; | |
981 | else | |
982 | context->return_code = return_code; | |
1da177e4 | 983 | |
0590b933 AV |
984 | if (context->in_syscall && !context->dummy) { |
985 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
986 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
987 | } |
988 | ||
1da177e4 LT |
989 | tsk->audit_context = NULL; |
990 | return context; | |
991 | } | |
992 | ||
993 | static inline void audit_free_names(struct audit_context *context) | |
994 | { | |
5195d8e2 | 995 | struct audit_names *n, *next; |
1da177e4 LT |
996 | |
997 | #if AUDIT_DEBUG == 2 | |
0590b933 | 998 | if (context->put_count + context->ino_count != context->name_count) { |
73241ccc | 999 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
1000 | " name_count=%d put_count=%d" |
1001 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 1002 | __FILE__, __LINE__, |
1da177e4 LT |
1003 | context->serial, context->major, context->in_syscall, |
1004 | context->name_count, context->put_count, | |
1005 | context->ino_count); | |
5195d8e2 | 1006 | list_for_each_entry(n, &context->names_list, list) { |
1da177e4 | 1007 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
5195d8e2 | 1008 | n->name, n->name ?: "(null)"); |
8c8570fb | 1009 | } |
1da177e4 LT |
1010 | dump_stack(); |
1011 | return; | |
1012 | } | |
1013 | #endif | |
1014 | #if AUDIT_DEBUG | |
1015 | context->put_count = 0; | |
1016 | context->ino_count = 0; | |
1017 | #endif | |
1018 | ||
5195d8e2 EP |
1019 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
1020 | list_del(&n->list); | |
1021 | if (n->name && n->name_put) | |
1022 | __putname(n->name); | |
1023 | if (n->should_free) | |
1024 | kfree(n); | |
8c8570fb | 1025 | } |
1da177e4 | 1026 | context->name_count = 0; |
44707fdf JB |
1027 | path_put(&context->pwd); |
1028 | context->pwd.dentry = NULL; | |
1029 | context->pwd.mnt = NULL; | |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | static inline void audit_free_aux(struct audit_context *context) | |
1033 | { | |
1034 | struct audit_aux_data *aux; | |
1035 | ||
1036 | while ((aux = context->aux)) { | |
1037 | context->aux = aux->next; | |
1038 | kfree(aux); | |
1039 | } | |
e54dc243 AG |
1040 | while ((aux = context->aux_pids)) { |
1041 | context->aux_pids = aux->next; | |
1042 | kfree(aux); | |
1043 | } | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | static inline void audit_zero_context(struct audit_context *context, | |
1047 | enum audit_state state) | |
1048 | { | |
1da177e4 LT |
1049 | memset(context, 0, sizeof(*context)); |
1050 | context->state = state; | |
0590b933 | 1051 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
1055 | { | |
1056 | struct audit_context *context; | |
1057 | ||
1058 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
1059 | return NULL; | |
1060 | audit_zero_context(context, state); | |
916d7576 | 1061 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 1062 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
1063 | return context; |
1064 | } | |
1065 | ||
b0dd25a8 RD |
1066 | /** |
1067 | * audit_alloc - allocate an audit context block for a task | |
1068 | * @tsk: task | |
1069 | * | |
1070 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
1071 | * if necessary. Doing so turns on system call auditing for the |
1072 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
1073 | * needed. |
1074 | */ | |
1da177e4 LT |
1075 | int audit_alloc(struct task_struct *tsk) |
1076 | { | |
1077 | struct audit_context *context; | |
1078 | enum audit_state state; | |
e048e02c | 1079 | char *key = NULL; |
1da177e4 | 1080 | |
b593d384 | 1081 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
1082 | return 0; /* Return if not auditing. */ |
1083 | ||
e048e02c | 1084 | state = audit_filter_task(tsk, &key); |
56179a6e | 1085 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1086 | return 0; |
1087 | ||
1088 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 1089 | kfree(key); |
1da177e4 LT |
1090 | audit_log_lost("out of memory in audit_alloc"); |
1091 | return -ENOMEM; | |
1092 | } | |
e048e02c | 1093 | context->filterkey = key; |
1da177e4 | 1094 | |
1da177e4 LT |
1095 | tsk->audit_context = context; |
1096 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | static inline void audit_free_context(struct audit_context *context) | |
1101 | { | |
1102 | struct audit_context *previous; | |
1103 | int count = 0; | |
1104 | ||
1105 | do { | |
1106 | previous = context->previous; | |
1107 | if (previous || (count && count < 10)) { | |
1108 | ++count; | |
1109 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
1110 | " freeing multiple contexts (%d)\n", | |
1111 | context->serial, context->major, | |
1112 | context->name_count, count); | |
1113 | } | |
1114 | audit_free_names(context); | |
74c3cbe3 AV |
1115 | unroll_tree_refs(context, NULL, 0); |
1116 | free_tree_refs(context); | |
1da177e4 | 1117 | audit_free_aux(context); |
5adc8a6a | 1118 | kfree(context->filterkey); |
4f6b434f | 1119 | kfree(context->sockaddr); |
1da177e4 LT |
1120 | kfree(context); |
1121 | context = previous; | |
1122 | } while (context); | |
1123 | if (count >= 10) | |
1124 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
1125 | } | |
1126 | ||
161a09e7 | 1127 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
1128 | { |
1129 | char *ctx = NULL; | |
c4823bce AV |
1130 | unsigned len; |
1131 | int error; | |
1132 | u32 sid; | |
1133 | ||
2a862b32 | 1134 | security_task_getsecid(current, &sid); |
c4823bce AV |
1135 | if (!sid) |
1136 | return; | |
8c8570fb | 1137 | |
2a862b32 | 1138 | error = security_secid_to_secctx(sid, &ctx, &len); |
c4823bce AV |
1139 | if (error) { |
1140 | if (error != -EINVAL) | |
8c8570fb DK |
1141 | goto error_path; |
1142 | return; | |
1143 | } | |
1144 | ||
8c8570fb | 1145 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 | 1146 | security_release_secctx(ctx, len); |
7306a0b9 | 1147 | return; |
8c8570fb DK |
1148 | |
1149 | error_path: | |
7306a0b9 | 1150 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
1151 | return; |
1152 | } | |
1153 | ||
161a09e7 JL |
1154 | EXPORT_SYMBOL(audit_log_task_context); |
1155 | ||
e495149b | 1156 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 1157 | { |
45d9bb0e AV |
1158 | char name[sizeof(tsk->comm)]; |
1159 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
1160 | struct vm_area_struct *vma; |
1161 | ||
e495149b AV |
1162 | /* tsk == current */ |
1163 | ||
45d9bb0e | 1164 | get_task_comm(name, tsk); |
99e45eea DW |
1165 | audit_log_format(ab, " comm="); |
1166 | audit_log_untrustedstring(ab, name); | |
219f0817 | 1167 | |
e495149b AV |
1168 | if (mm) { |
1169 | down_read(&mm->mmap_sem); | |
1170 | vma = mm->mmap; | |
1171 | while (vma) { | |
1172 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
1173 | vma->vm_file) { | |
c158a35c | 1174 | audit_log_d_path(ab, " exe=", |
44707fdf | 1175 | &vma->vm_file->f_path); |
e495149b AV |
1176 | break; |
1177 | } | |
1178 | vma = vma->vm_next; | |
219f0817 | 1179 | } |
e495149b | 1180 | up_read(&mm->mmap_sem); |
219f0817 | 1181 | } |
e495149b | 1182 | audit_log_task_context(ab); |
219f0817 SS |
1183 | } |
1184 | ||
e54dc243 | 1185 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
4746ec5b EP |
1186 | uid_t auid, uid_t uid, unsigned int sessionid, |
1187 | u32 sid, char *comm) | |
e54dc243 AG |
1188 | { |
1189 | struct audit_buffer *ab; | |
2a862b32 | 1190 | char *ctx = NULL; |
e54dc243 AG |
1191 | u32 len; |
1192 | int rc = 0; | |
1193 | ||
1194 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
1195 | if (!ab) | |
6246ccab | 1196 | return rc; |
e54dc243 | 1197 | |
4746ec5b EP |
1198 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid, |
1199 | uid, sessionid); | |
2a862b32 | 1200 | if (security_secid_to_secctx(sid, &ctx, &len)) { |
c2a7780e | 1201 | audit_log_format(ab, " obj=(none)"); |
e54dc243 | 1202 | rc = 1; |
2a862b32 AD |
1203 | } else { |
1204 | audit_log_format(ab, " obj=%s", ctx); | |
1205 | security_release_secctx(ctx, len); | |
1206 | } | |
c2a7780e EP |
1207 | audit_log_format(ab, " ocomm="); |
1208 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1209 | audit_log_end(ab); |
e54dc243 AG |
1210 | |
1211 | return rc; | |
1212 | } | |
1213 | ||
de6bbd1d EP |
1214 | /* |
1215 | * to_send and len_sent accounting are very loose estimates. We aren't | |
1216 | * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being | |
25985edc | 1217 | * within about 500 bytes (next page boundary) |
de6bbd1d EP |
1218 | * |
1219 | * why snprintf? an int is up to 12 digits long. if we just assumed when | |
1220 | * logging that a[%d]= was going to be 16 characters long we would be wasting | |
1221 | * space in every audit message. In one 7500 byte message we can log up to | |
1222 | * about 1000 min size arguments. That comes down to about 50% waste of space | |
1223 | * if we didn't do the snprintf to find out how long arg_num_len was. | |
1224 | */ | |
1225 | static int audit_log_single_execve_arg(struct audit_context *context, | |
1226 | struct audit_buffer **ab, | |
1227 | int arg_num, | |
1228 | size_t *len_sent, | |
1229 | const char __user *p, | |
1230 | char *buf) | |
bdf4c48a | 1231 | { |
de6bbd1d EP |
1232 | char arg_num_len_buf[12]; |
1233 | const char __user *tmp_p = p; | |
b87ce6e4 EP |
1234 | /* how many digits are in arg_num? 5 is the length of ' a=""' */ |
1235 | size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5; | |
de6bbd1d EP |
1236 | size_t len, len_left, to_send; |
1237 | size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; | |
1238 | unsigned int i, has_cntl = 0, too_long = 0; | |
1239 | int ret; | |
1240 | ||
1241 | /* strnlen_user includes the null we don't want to send */ | |
1242 | len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
bdf4c48a | 1243 | |
de6bbd1d EP |
1244 | /* |
1245 | * We just created this mm, if we can't find the strings | |
1246 | * we just copied into it something is _very_ wrong. Similar | |
1247 | * for strings that are too long, we should not have created | |
1248 | * any. | |
1249 | */ | |
b0abcfc1 | 1250 | if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) { |
de6bbd1d EP |
1251 | WARN_ON(1); |
1252 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1253 | return -1; |
de6bbd1d | 1254 | } |
040b3a2d | 1255 | |
de6bbd1d EP |
1256 | /* walk the whole argument looking for non-ascii chars */ |
1257 | do { | |
1258 | if (len_left > MAX_EXECVE_AUDIT_LEN) | |
1259 | to_send = MAX_EXECVE_AUDIT_LEN; | |
1260 | else | |
1261 | to_send = len_left; | |
1262 | ret = copy_from_user(buf, tmp_p, to_send); | |
bdf4c48a | 1263 | /* |
de6bbd1d EP |
1264 | * There is no reason for this copy to be short. We just |
1265 | * copied them here, and the mm hasn't been exposed to user- | |
1266 | * space yet. | |
bdf4c48a | 1267 | */ |
de6bbd1d | 1268 | if (ret) { |
bdf4c48a PZ |
1269 | WARN_ON(1); |
1270 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1271 | return -1; |
bdf4c48a | 1272 | } |
de6bbd1d EP |
1273 | buf[to_send] = '\0'; |
1274 | has_cntl = audit_string_contains_control(buf, to_send); | |
1275 | if (has_cntl) { | |
1276 | /* | |
1277 | * hex messages get logged as 2 bytes, so we can only | |
1278 | * send half as much in each message | |
1279 | */ | |
1280 | max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2; | |
bdf4c48a PZ |
1281 | break; |
1282 | } | |
de6bbd1d EP |
1283 | len_left -= to_send; |
1284 | tmp_p += to_send; | |
1285 | } while (len_left > 0); | |
1286 | ||
1287 | len_left = len; | |
1288 | ||
1289 | if (len > max_execve_audit_len) | |
1290 | too_long = 1; | |
1291 | ||
1292 | /* rewalk the argument actually logging the message */ | |
1293 | for (i = 0; len_left > 0; i++) { | |
1294 | int room_left; | |
1295 | ||
1296 | if (len_left > max_execve_audit_len) | |
1297 | to_send = max_execve_audit_len; | |
1298 | else | |
1299 | to_send = len_left; | |
1300 | ||
1301 | /* do we have space left to send this argument in this ab? */ | |
1302 | room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent; | |
1303 | if (has_cntl) | |
1304 | room_left -= (to_send * 2); | |
1305 | else | |
1306 | room_left -= to_send; | |
1307 | if (room_left < 0) { | |
1308 | *len_sent = 0; | |
1309 | audit_log_end(*ab); | |
1310 | *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE); | |
1311 | if (!*ab) | |
1312 | return 0; | |
1313 | } | |
bdf4c48a | 1314 | |
bdf4c48a | 1315 | /* |
de6bbd1d EP |
1316 | * first record needs to say how long the original string was |
1317 | * so we can be sure nothing was lost. | |
1318 | */ | |
1319 | if ((i == 0) && (too_long)) | |
ca96a895 | 1320 | audit_log_format(*ab, " a%d_len=%zu", arg_num, |
de6bbd1d EP |
1321 | has_cntl ? 2*len : len); |
1322 | ||
1323 | /* | |
1324 | * normally arguments are small enough to fit and we already | |
1325 | * filled buf above when we checked for control characters | |
1326 | * so don't bother with another copy_from_user | |
bdf4c48a | 1327 | */ |
de6bbd1d EP |
1328 | if (len >= max_execve_audit_len) |
1329 | ret = copy_from_user(buf, p, to_send); | |
1330 | else | |
1331 | ret = 0; | |
040b3a2d | 1332 | if (ret) { |
bdf4c48a PZ |
1333 | WARN_ON(1); |
1334 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1335 | return -1; |
bdf4c48a | 1336 | } |
de6bbd1d EP |
1337 | buf[to_send] = '\0'; |
1338 | ||
1339 | /* actually log it */ | |
ca96a895 | 1340 | audit_log_format(*ab, " a%d", arg_num); |
de6bbd1d EP |
1341 | if (too_long) |
1342 | audit_log_format(*ab, "[%d]", i); | |
1343 | audit_log_format(*ab, "="); | |
1344 | if (has_cntl) | |
b556f8ad | 1345 | audit_log_n_hex(*ab, buf, to_send); |
de6bbd1d | 1346 | else |
9d960985 | 1347 | audit_log_string(*ab, buf); |
de6bbd1d EP |
1348 | |
1349 | p += to_send; | |
1350 | len_left -= to_send; | |
1351 | *len_sent += arg_num_len; | |
1352 | if (has_cntl) | |
1353 | *len_sent += to_send * 2; | |
1354 | else | |
1355 | *len_sent += to_send; | |
1356 | } | |
1357 | /* include the null we didn't log */ | |
1358 | return len + 1; | |
1359 | } | |
1360 | ||
1361 | static void audit_log_execve_info(struct audit_context *context, | |
1362 | struct audit_buffer **ab, | |
1363 | struct audit_aux_data_execve *axi) | |
1364 | { | |
5afb8a3f XW |
1365 | int i, len; |
1366 | size_t len_sent = 0; | |
de6bbd1d EP |
1367 | const char __user *p; |
1368 | char *buf; | |
bdf4c48a | 1369 | |
de6bbd1d EP |
1370 | if (axi->mm != current->mm) |
1371 | return; /* execve failed, no additional info */ | |
1372 | ||
1373 | p = (const char __user *)axi->mm->arg_start; | |
bdf4c48a | 1374 | |
ca96a895 | 1375 | audit_log_format(*ab, "argc=%d", axi->argc); |
de6bbd1d EP |
1376 | |
1377 | /* | |
1378 | * we need some kernel buffer to hold the userspace args. Just | |
1379 | * allocate one big one rather than allocating one of the right size | |
1380 | * for every single argument inside audit_log_single_execve_arg() | |
1381 | * should be <8k allocation so should be pretty safe. | |
1382 | */ | |
1383 | buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1384 | if (!buf) { | |
1385 | audit_panic("out of memory for argv string\n"); | |
1386 | return; | |
bdf4c48a | 1387 | } |
de6bbd1d EP |
1388 | |
1389 | for (i = 0; i < axi->argc; i++) { | |
1390 | len = audit_log_single_execve_arg(context, ab, i, | |
1391 | &len_sent, p, buf); | |
1392 | if (len <= 0) | |
1393 | break; | |
1394 | p += len; | |
1395 | } | |
1396 | kfree(buf); | |
bdf4c48a PZ |
1397 | } |
1398 | ||
851f7ff5 EP |
1399 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1400 | { | |
1401 | int i; | |
1402 | ||
1403 | audit_log_format(ab, " %s=", prefix); | |
1404 | CAP_FOR_EACH_U32(i) { | |
1405 | audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); | |
1406 | } | |
1407 | } | |
1408 | ||
1409 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1410 | { | |
1411 | kernel_cap_t *perm = &name->fcap.permitted; | |
1412 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1413 | int log = 0; | |
1414 | ||
1415 | if (!cap_isclear(*perm)) { | |
1416 | audit_log_cap(ab, "cap_fp", perm); | |
1417 | log = 1; | |
1418 | } | |
1419 | if (!cap_isclear(*inh)) { | |
1420 | audit_log_cap(ab, "cap_fi", inh); | |
1421 | log = 1; | |
1422 | } | |
1423 | ||
1424 | if (log) | |
1425 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); | |
1426 | } | |
1427 | ||
a33e6751 | 1428 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1429 | { |
1430 | struct audit_buffer *ab; | |
1431 | int i; | |
1432 | ||
1433 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1434 | if (!ab) | |
1435 | return; | |
1436 | ||
1437 | switch (context->type) { | |
1438 | case AUDIT_SOCKETCALL: { | |
1439 | int nargs = context->socketcall.nargs; | |
1440 | audit_log_format(ab, "nargs=%d", nargs); | |
1441 | for (i = 0; i < nargs; i++) | |
1442 | audit_log_format(ab, " a%d=%lx", i, | |
1443 | context->socketcall.args[i]); | |
1444 | break; } | |
a33e6751 AV |
1445 | case AUDIT_IPC: { |
1446 | u32 osid = context->ipc.osid; | |
1447 | ||
2570ebbd | 1448 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
a33e6751 AV |
1449 | context->ipc.uid, context->ipc.gid, context->ipc.mode); |
1450 | if (osid) { | |
1451 | char *ctx = NULL; | |
1452 | u32 len; | |
1453 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1454 | audit_log_format(ab, " osid=%u", osid); | |
1455 | *call_panic = 1; | |
1456 | } else { | |
1457 | audit_log_format(ab, " obj=%s", ctx); | |
1458 | security_release_secctx(ctx, len); | |
1459 | } | |
1460 | } | |
e816f370 AV |
1461 | if (context->ipc.has_perm) { |
1462 | audit_log_end(ab); | |
1463 | ab = audit_log_start(context, GFP_KERNEL, | |
1464 | AUDIT_IPC_SET_PERM); | |
1465 | audit_log_format(ab, | |
2570ebbd | 1466 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1467 | context->ipc.qbytes, |
1468 | context->ipc.perm_uid, | |
1469 | context->ipc.perm_gid, | |
1470 | context->ipc.perm_mode); | |
1471 | if (!ab) | |
1472 | return; | |
1473 | } | |
a33e6751 | 1474 | break; } |
564f6993 AV |
1475 | case AUDIT_MQ_OPEN: { |
1476 | audit_log_format(ab, | |
df0a4283 | 1477 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1478 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1479 | context->mq_open.oflag, context->mq_open.mode, | |
1480 | context->mq_open.attr.mq_flags, | |
1481 | context->mq_open.attr.mq_maxmsg, | |
1482 | context->mq_open.attr.mq_msgsize, | |
1483 | context->mq_open.attr.mq_curmsgs); | |
1484 | break; } | |
c32c8af4 AV |
1485 | case AUDIT_MQ_SENDRECV: { |
1486 | audit_log_format(ab, | |
1487 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
1488 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
1489 | context->mq_sendrecv.mqdes, | |
1490 | context->mq_sendrecv.msg_len, | |
1491 | context->mq_sendrecv.msg_prio, | |
1492 | context->mq_sendrecv.abs_timeout.tv_sec, | |
1493 | context->mq_sendrecv.abs_timeout.tv_nsec); | |
1494 | break; } | |
20114f71 AV |
1495 | case AUDIT_MQ_NOTIFY: { |
1496 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", | |
1497 | context->mq_notify.mqdes, | |
1498 | context->mq_notify.sigev_signo); | |
1499 | break; } | |
7392906e AV |
1500 | case AUDIT_MQ_GETSETATTR: { |
1501 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1502 | audit_log_format(ab, | |
1503 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1504 | "mq_curmsgs=%ld ", | |
1505 | context->mq_getsetattr.mqdes, | |
1506 | attr->mq_flags, attr->mq_maxmsg, | |
1507 | attr->mq_msgsize, attr->mq_curmsgs); | |
1508 | break; } | |
57f71a0a AV |
1509 | case AUDIT_CAPSET: { |
1510 | audit_log_format(ab, "pid=%d", context->capset.pid); | |
1511 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1512 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1513 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
1514 | break; } | |
120a795d AV |
1515 | case AUDIT_MMAP: { |
1516 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, | |
1517 | context->mmap.flags); | |
1518 | break; } | |
f3298dc4 AV |
1519 | } |
1520 | audit_log_end(ab); | |
1521 | } | |
1522 | ||
5195d8e2 EP |
1523 | static void audit_log_name(struct audit_context *context, struct audit_names *n, |
1524 | int record_num, int *call_panic) | |
1525 | { | |
1526 | struct audit_buffer *ab; | |
1527 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1528 | if (!ab) | |
1529 | return; /* audit_panic has been called */ | |
1530 | ||
1531 | audit_log_format(ab, "item=%d", record_num); | |
1532 | ||
1533 | if (n->name) { | |
1534 | switch (n->name_len) { | |
1535 | case AUDIT_NAME_FULL: | |
1536 | /* log the full path */ | |
1537 | audit_log_format(ab, " name="); | |
1538 | audit_log_untrustedstring(ab, n->name); | |
1539 | break; | |
1540 | case 0: | |
1541 | /* name was specified as a relative path and the | |
1542 | * directory component is the cwd */ | |
c158a35c | 1543 | audit_log_d_path(ab, " name=", &context->pwd); |
5195d8e2 EP |
1544 | break; |
1545 | default: | |
1546 | /* log the name's directory component */ | |
1547 | audit_log_format(ab, " name="); | |
1548 | audit_log_n_untrustedstring(ab, n->name, | |
1549 | n->name_len); | |
1550 | } | |
1551 | } else | |
1552 | audit_log_format(ab, " name=(null)"); | |
1553 | ||
1554 | if (n->ino != (unsigned long)-1) { | |
1555 | audit_log_format(ab, " inode=%lu" | |
1556 | " dev=%02x:%02x mode=%#ho" | |
1557 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1558 | n->ino, | |
1559 | MAJOR(n->dev), | |
1560 | MINOR(n->dev), | |
1561 | n->mode, | |
1562 | n->uid, | |
1563 | n->gid, | |
1564 | MAJOR(n->rdev), | |
1565 | MINOR(n->rdev)); | |
1566 | } | |
1567 | if (n->osid != 0) { | |
1568 | char *ctx = NULL; | |
1569 | u32 len; | |
1570 | if (security_secid_to_secctx( | |
1571 | n->osid, &ctx, &len)) { | |
1572 | audit_log_format(ab, " osid=%u", n->osid); | |
1573 | *call_panic = 2; | |
1574 | } else { | |
1575 | audit_log_format(ab, " obj=%s", ctx); | |
1576 | security_release_secctx(ctx, len); | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | audit_log_fcaps(ab, n); | |
1581 | ||
1582 | audit_log_end(ab); | |
1583 | } | |
1584 | ||
e495149b | 1585 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1586 | { |
c69e8d9c | 1587 | const struct cred *cred; |
9c7aa6aa | 1588 | int i, call_panic = 0; |
1da177e4 | 1589 | struct audit_buffer *ab; |
7551ced3 | 1590 | struct audit_aux_data *aux; |
a6c043a8 | 1591 | const char *tty; |
5195d8e2 | 1592 | struct audit_names *n; |
1da177e4 | 1593 | |
e495149b | 1594 | /* tsk == current */ |
3f2792ff | 1595 | context->pid = tsk->pid; |
419c58f1 AV |
1596 | if (!context->ppid) |
1597 | context->ppid = sys_getppid(); | |
c69e8d9c DH |
1598 | cred = current_cred(); |
1599 | context->uid = cred->uid; | |
1600 | context->gid = cred->gid; | |
1601 | context->euid = cred->euid; | |
1602 | context->suid = cred->suid; | |
b6dff3ec | 1603 | context->fsuid = cred->fsuid; |
c69e8d9c DH |
1604 | context->egid = cred->egid; |
1605 | context->sgid = cred->sgid; | |
b6dff3ec | 1606 | context->fsgid = cred->fsgid; |
3f2792ff | 1607 | context->personality = tsk->personality; |
e495149b AV |
1608 | |
1609 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1610 | if (!ab) |
1611 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1612 | audit_log_format(ab, "arch=%x syscall=%d", |
1613 | context->arch, context->major); | |
1da177e4 LT |
1614 | if (context->personality != PER_LINUX) |
1615 | audit_log_format(ab, " per=%lx", context->personality); | |
1616 | if (context->return_valid) | |
9f8dbe9c | 1617 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1618 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1619 | context->return_code); | |
eb84a20e | 1620 | |
dbda4c0b | 1621 | spin_lock_irq(&tsk->sighand->siglock); |
45d9bb0e AV |
1622 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
1623 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
1624 | else |
1625 | tty = "(none)"; | |
dbda4c0b AC |
1626 | spin_unlock_irq(&tsk->sighand->siglock); |
1627 | ||
1da177e4 LT |
1628 | audit_log_format(ab, |
1629 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 1630 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 1631 | " euid=%u suid=%u fsuid=%u" |
4746ec5b | 1632 | " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
1da177e4 LT |
1633 | context->argv[0], |
1634 | context->argv[1], | |
1635 | context->argv[2], | |
1636 | context->argv[3], | |
1637 | context->name_count, | |
f46038ff | 1638 | context->ppid, |
1da177e4 | 1639 | context->pid, |
bfef93a5 | 1640 | tsk->loginuid, |
1da177e4 LT |
1641 | context->uid, |
1642 | context->gid, | |
1643 | context->euid, context->suid, context->fsuid, | |
4746ec5b EP |
1644 | context->egid, context->sgid, context->fsgid, tty, |
1645 | tsk->sessionid); | |
eb84a20e | 1646 | |
eb84a20e | 1647 | |
e495149b | 1648 | audit_log_task_info(ab, tsk); |
9d960985 | 1649 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1650 | audit_log_end(ab); |
1da177e4 | 1651 | |
7551ced3 | 1652 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1653 | |
e495149b | 1654 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1655 | if (!ab) |
1656 | continue; /* audit_panic has been called */ | |
1657 | ||
1da177e4 | 1658 | switch (aux->type) { |
20ca73bc | 1659 | |
473ae30b AV |
1660 | case AUDIT_EXECVE: { |
1661 | struct audit_aux_data_execve *axi = (void *)aux; | |
de6bbd1d | 1662 | audit_log_execve_info(context, &ab, axi); |
473ae30b | 1663 | break; } |
073115d6 | 1664 | |
3fc689e9 EP |
1665 | case AUDIT_BPRM_FCAPS: { |
1666 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1667 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1668 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1669 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1670 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1671 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1672 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1673 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
1674 | audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted); | |
1675 | audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); | |
1676 | audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); | |
1677 | break; } | |
1678 | ||
1da177e4 LT |
1679 | } |
1680 | audit_log_end(ab); | |
1da177e4 LT |
1681 | } |
1682 | ||
f3298dc4 | 1683 | if (context->type) |
a33e6751 | 1684 | show_special(context, &call_panic); |
f3298dc4 | 1685 | |
157cf649 AV |
1686 | if (context->fds[0] >= 0) { |
1687 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1688 | if (ab) { | |
1689 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1690 | context->fds[0], context->fds[1]); | |
1691 | audit_log_end(ab); | |
1692 | } | |
1693 | } | |
1694 | ||
4f6b434f AV |
1695 | if (context->sockaddr_len) { |
1696 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1697 | if (ab) { | |
1698 | audit_log_format(ab, "saddr="); | |
1699 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1700 | context->sockaddr_len); | |
1701 | audit_log_end(ab); | |
1702 | } | |
1703 | } | |
1704 | ||
e54dc243 AG |
1705 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1706 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1707 | |
1708 | for (i = 0; i < axs->pid_count; i++) | |
1709 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1710 | axs->target_auid[i], |
1711 | axs->target_uid[i], | |
4746ec5b | 1712 | axs->target_sessionid[i], |
c2a7780e EP |
1713 | axs->target_sid[i], |
1714 | axs->target_comm[i])) | |
e54dc243 | 1715 | call_panic = 1; |
a5cb013d AV |
1716 | } |
1717 | ||
e54dc243 AG |
1718 | if (context->target_pid && |
1719 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1720 | context->target_auid, context->target_uid, |
4746ec5b | 1721 | context->target_sessionid, |
c2a7780e | 1722 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1723 | call_panic = 1; |
1724 | ||
44707fdf | 1725 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1726 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1727 | if (ab) { |
c158a35c | 1728 | audit_log_d_path(ab, " cwd=", &context->pwd); |
8f37d47c DW |
1729 | audit_log_end(ab); |
1730 | } | |
1731 | } | |
73241ccc | 1732 | |
5195d8e2 EP |
1733 | i = 0; |
1734 | list_for_each_entry(n, &context->names_list, list) | |
1735 | audit_log_name(context, n, i++, &call_panic); | |
c0641f28 EP |
1736 | |
1737 | /* Send end of event record to help user space know we are finished */ | |
1738 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1739 | if (ab) | |
1740 | audit_log_end(ab); | |
9c7aa6aa SG |
1741 | if (call_panic) |
1742 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1743 | } |
1744 | ||
b0dd25a8 RD |
1745 | /** |
1746 | * audit_free - free a per-task audit context | |
1747 | * @tsk: task whose audit context block to free | |
1748 | * | |
fa84cb93 | 1749 | * Called from copy_process and do_exit |
b0dd25a8 | 1750 | */ |
a4ff8dba | 1751 | void __audit_free(struct task_struct *tsk) |
1da177e4 LT |
1752 | { |
1753 | struct audit_context *context; | |
1754 | ||
1da177e4 | 1755 | context = audit_get_context(tsk, 0, 0); |
56179a6e | 1756 | if (!context) |
1da177e4 LT |
1757 | return; |
1758 | ||
1759 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1760 | * function (e.g., exit_group), then free context block. |
1761 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1762 | * in the context of the idle thread */ |
e495149b | 1763 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1764 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1765 | audit_log_exit(context, tsk); |
916d7576 AV |
1766 | if (!list_empty(&context->killed_trees)) |
1767 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1768 | |
1769 | audit_free_context(context); | |
1770 | } | |
1771 | ||
b0dd25a8 RD |
1772 | /** |
1773 | * audit_syscall_entry - fill in an audit record at syscall entry | |
b0dd25a8 RD |
1774 | * @arch: architecture type |
1775 | * @major: major syscall type (function) | |
1776 | * @a1: additional syscall register 1 | |
1777 | * @a2: additional syscall register 2 | |
1778 | * @a3: additional syscall register 3 | |
1779 | * @a4: additional syscall register 4 | |
1780 | * | |
1781 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1782 | * audit context was created when the task was created and the state or |
1783 | * filters demand the audit context be built. If the state from the | |
1784 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1785 | * then the record will be written at syscall exit time (otherwise, it | |
1786 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1787 | * be written). |
1788 | */ | |
b05d8447 | 1789 | void __audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1790 | unsigned long a1, unsigned long a2, |
1791 | unsigned long a3, unsigned long a4) | |
1792 | { | |
5411be59 | 1793 | struct task_struct *tsk = current; |
1da177e4 LT |
1794 | struct audit_context *context = tsk->audit_context; |
1795 | enum audit_state state; | |
1796 | ||
56179a6e | 1797 | if (!context) |
86a1c34a | 1798 | return; |
1da177e4 | 1799 | |
b0dd25a8 RD |
1800 | /* |
1801 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1802 | * calls in kernel_thread via the entry.S interface, instead of |
1803 | * with direct calls. (If you are porting to a new | |
1804 | * architecture, hitting this condition can indicate that you | |
1805 | * got the _exit/_leave calls backward in entry.S.) | |
1806 | * | |
1807 | * i386 no | |
1808 | * x86_64 no | |
2ef9481e | 1809 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1810 | * |
1811 | * This also happens with vm86 emulation in a non-nested manner | |
1812 | * (entries without exits), so this case must be caught. | |
1813 | */ | |
1814 | if (context->in_syscall) { | |
1815 | struct audit_context *newctx; | |
1816 | ||
1da177e4 LT |
1817 | #if AUDIT_DEBUG |
1818 | printk(KERN_ERR | |
1819 | "audit(:%d) pid=%d in syscall=%d;" | |
1820 | " entering syscall=%d\n", | |
1821 | context->serial, tsk->pid, context->major, major); | |
1822 | #endif | |
1823 | newctx = audit_alloc_context(context->state); | |
1824 | if (newctx) { | |
1825 | newctx->previous = context; | |
1826 | context = newctx; | |
1827 | tsk->audit_context = newctx; | |
1828 | } else { | |
1829 | /* If we can't alloc a new context, the best we | |
1830 | * can do is to leak memory (any pending putname | |
1831 | * will be lost). The only other alternative is | |
1832 | * to abandon auditing. */ | |
1833 | audit_zero_context(context, context->state); | |
1834 | } | |
1835 | } | |
1836 | BUG_ON(context->in_syscall || context->name_count); | |
1837 | ||
1838 | if (!audit_enabled) | |
1839 | return; | |
1840 | ||
2fd6f58b | 1841 | context->arch = arch; |
1da177e4 LT |
1842 | context->major = major; |
1843 | context->argv[0] = a1; | |
1844 | context->argv[1] = a2; | |
1845 | context->argv[2] = a3; | |
1846 | context->argv[3] = a4; | |
1847 | ||
1848 | state = context->state; | |
d51374ad | 1849 | context->dummy = !audit_n_rules; |
0590b933 AV |
1850 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1851 | context->prio = 0; | |
0f45aa18 | 1852 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
0590b933 | 1853 | } |
56179a6e | 1854 | if (state == AUDIT_DISABLED) |
1da177e4 LT |
1855 | return; |
1856 | ||
ce625a80 | 1857 | context->serial = 0; |
1da177e4 LT |
1858 | context->ctime = CURRENT_TIME; |
1859 | context->in_syscall = 1; | |
0590b933 | 1860 | context->current_state = state; |
419c58f1 | 1861 | context->ppid = 0; |
1da177e4 LT |
1862 | } |
1863 | ||
b0dd25a8 RD |
1864 | /** |
1865 | * audit_syscall_exit - deallocate audit context after a system call | |
42ae610c RD |
1866 | * @success: success value of the syscall |
1867 | * @return_code: return value of the syscall | |
b0dd25a8 RD |
1868 | * |
1869 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 | 1870 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
42ae610c | 1871 | * filtering, or because some other part of the kernel wrote an audit |
1da177e4 | 1872 | * message), then write out the syscall information. In call cases, |
b0dd25a8 RD |
1873 | * free the names stored from getname(). |
1874 | */ | |
d7e7528b | 1875 | void __audit_syscall_exit(int success, long return_code) |
1da177e4 | 1876 | { |
5411be59 | 1877 | struct task_struct *tsk = current; |
1da177e4 LT |
1878 | struct audit_context *context; |
1879 | ||
d7e7528b EP |
1880 | if (success) |
1881 | success = AUDITSC_SUCCESS; | |
1882 | else | |
1883 | success = AUDITSC_FAILURE; | |
1da177e4 | 1884 | |
d7e7528b | 1885 | context = audit_get_context(tsk, success, return_code); |
56179a6e | 1886 | if (!context) |
97e94c45 | 1887 | return; |
1da177e4 | 1888 | |
0590b933 | 1889 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1890 | audit_log_exit(context, tsk); |
1da177e4 LT |
1891 | |
1892 | context->in_syscall = 0; | |
0590b933 | 1893 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1894 | |
916d7576 AV |
1895 | if (!list_empty(&context->killed_trees)) |
1896 | audit_kill_trees(&context->killed_trees); | |
1897 | ||
1da177e4 LT |
1898 | if (context->previous) { |
1899 | struct audit_context *new_context = context->previous; | |
1900 | context->previous = NULL; | |
1901 | audit_free_context(context); | |
1902 | tsk->audit_context = new_context; | |
1903 | } else { | |
1904 | audit_free_names(context); | |
74c3cbe3 | 1905 | unroll_tree_refs(context, NULL, 0); |
1da177e4 | 1906 | audit_free_aux(context); |
e54dc243 AG |
1907 | context->aux = NULL; |
1908 | context->aux_pids = NULL; | |
a5cb013d | 1909 | context->target_pid = 0; |
e54dc243 | 1910 | context->target_sid = 0; |
4f6b434f | 1911 | context->sockaddr_len = 0; |
f3298dc4 | 1912 | context->type = 0; |
157cf649 | 1913 | context->fds[0] = -1; |
e048e02c AV |
1914 | if (context->state != AUDIT_RECORD_CONTEXT) { |
1915 | kfree(context->filterkey); | |
1916 | context->filterkey = NULL; | |
1917 | } | |
1da177e4 LT |
1918 | tsk->audit_context = context; |
1919 | } | |
1da177e4 LT |
1920 | } |
1921 | ||
74c3cbe3 AV |
1922 | static inline void handle_one(const struct inode *inode) |
1923 | { | |
1924 | #ifdef CONFIG_AUDIT_TREE | |
1925 | struct audit_context *context; | |
1926 | struct audit_tree_refs *p; | |
1927 | struct audit_chunk *chunk; | |
1928 | int count; | |
e61ce867 | 1929 | if (likely(hlist_empty(&inode->i_fsnotify_marks))) |
74c3cbe3 AV |
1930 | return; |
1931 | context = current->audit_context; | |
1932 | p = context->trees; | |
1933 | count = context->tree_count; | |
1934 | rcu_read_lock(); | |
1935 | chunk = audit_tree_lookup(inode); | |
1936 | rcu_read_unlock(); | |
1937 | if (!chunk) | |
1938 | return; | |
1939 | if (likely(put_tree_ref(context, chunk))) | |
1940 | return; | |
1941 | if (unlikely(!grow_tree_refs(context))) { | |
436c405c | 1942 | printk(KERN_WARNING "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1943 | audit_set_auditable(context); |
1944 | audit_put_chunk(chunk); | |
1945 | unroll_tree_refs(context, p, count); | |
1946 | return; | |
1947 | } | |
1948 | put_tree_ref(context, chunk); | |
1949 | #endif | |
1950 | } | |
1951 | ||
1952 | static void handle_path(const struct dentry *dentry) | |
1953 | { | |
1954 | #ifdef CONFIG_AUDIT_TREE | |
1955 | struct audit_context *context; | |
1956 | struct audit_tree_refs *p; | |
1957 | const struct dentry *d, *parent; | |
1958 | struct audit_chunk *drop; | |
1959 | unsigned long seq; | |
1960 | int count; | |
1961 | ||
1962 | context = current->audit_context; | |
1963 | p = context->trees; | |
1964 | count = context->tree_count; | |
1965 | retry: | |
1966 | drop = NULL; | |
1967 | d = dentry; | |
1968 | rcu_read_lock(); | |
1969 | seq = read_seqbegin(&rename_lock); | |
1970 | for(;;) { | |
1971 | struct inode *inode = d->d_inode; | |
e61ce867 | 1972 | if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) { |
74c3cbe3 AV |
1973 | struct audit_chunk *chunk; |
1974 | chunk = audit_tree_lookup(inode); | |
1975 | if (chunk) { | |
1976 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1977 | drop = chunk; | |
1978 | break; | |
1979 | } | |
1980 | } | |
1981 | } | |
1982 | parent = d->d_parent; | |
1983 | if (parent == d) | |
1984 | break; | |
1985 | d = parent; | |
1986 | } | |
1987 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1988 | rcu_read_unlock(); | |
1989 | if (!drop) { | |
1990 | /* just a race with rename */ | |
1991 | unroll_tree_refs(context, p, count); | |
1992 | goto retry; | |
1993 | } | |
1994 | audit_put_chunk(drop); | |
1995 | if (grow_tree_refs(context)) { | |
1996 | /* OK, got more space */ | |
1997 | unroll_tree_refs(context, p, count); | |
1998 | goto retry; | |
1999 | } | |
2000 | /* too bad */ | |
2001 | printk(KERN_WARNING | |
436c405c | 2002 | "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
2003 | unroll_tree_refs(context, p, count); |
2004 | audit_set_auditable(context); | |
2005 | return; | |
2006 | } | |
2007 | rcu_read_unlock(); | |
2008 | #endif | |
2009 | } | |
2010 | ||
5195d8e2 EP |
2011 | static struct audit_names *audit_alloc_name(struct audit_context *context) |
2012 | { | |
2013 | struct audit_names *aname; | |
2014 | ||
2015 | if (context->name_count < AUDIT_NAMES) { | |
2016 | aname = &context->preallocated_names[context->name_count]; | |
2017 | memset(aname, 0, sizeof(*aname)); | |
2018 | } else { | |
2019 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
2020 | if (!aname) | |
2021 | return NULL; | |
2022 | aname->should_free = true; | |
2023 | } | |
2024 | ||
2025 | aname->ino = (unsigned long)-1; | |
2026 | list_add_tail(&aname->list, &context->names_list); | |
2027 | ||
2028 | context->name_count++; | |
2029 | #if AUDIT_DEBUG | |
2030 | context->ino_count++; | |
2031 | #endif | |
2032 | return aname; | |
2033 | } | |
2034 | ||
b0dd25a8 RD |
2035 | /** |
2036 | * audit_getname - add a name to the list | |
2037 | * @name: name to add | |
2038 | * | |
2039 | * Add a name to the list of audit names for this context. | |
2040 | * Called from fs/namei.c:getname(). | |
2041 | */ | |
d8945bb5 | 2042 | void __audit_getname(const char *name) |
1da177e4 LT |
2043 | { |
2044 | struct audit_context *context = current->audit_context; | |
5195d8e2 | 2045 | struct audit_names *n; |
1da177e4 | 2046 | |
1da177e4 LT |
2047 | if (!context->in_syscall) { |
2048 | #if AUDIT_DEBUG == 2 | |
2049 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
2050 | __FILE__, __LINE__, context->serial, name); | |
2051 | dump_stack(); | |
2052 | #endif | |
2053 | return; | |
2054 | } | |
5195d8e2 EP |
2055 | |
2056 | n = audit_alloc_name(context); | |
2057 | if (!n) | |
2058 | return; | |
2059 | ||
2060 | n->name = name; | |
2061 | n->name_len = AUDIT_NAME_FULL; | |
2062 | n->name_put = true; | |
2063 | ||
f7ad3c6b MS |
2064 | if (!context->pwd.dentry) |
2065 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
2066 | } |
2067 | ||
b0dd25a8 RD |
2068 | /* audit_putname - intercept a putname request |
2069 | * @name: name to intercept and delay for putname | |
2070 | * | |
2071 | * If we have stored the name from getname in the audit context, | |
2072 | * then we delay the putname until syscall exit. | |
2073 | * Called from include/linux/fs.h:putname(). | |
2074 | */ | |
1da177e4 LT |
2075 | void audit_putname(const char *name) |
2076 | { | |
2077 | struct audit_context *context = current->audit_context; | |
2078 | ||
2079 | BUG_ON(!context); | |
2080 | if (!context->in_syscall) { | |
2081 | #if AUDIT_DEBUG == 2 | |
2082 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
2083 | __FILE__, __LINE__, context->serial, name); | |
2084 | if (context->name_count) { | |
5195d8e2 | 2085 | struct audit_names *n; |
1da177e4 | 2086 | int i; |
5195d8e2 EP |
2087 | |
2088 | list_for_each_entry(n, &context->names_list, list) | |
1da177e4 | 2089 | printk(KERN_ERR "name[%d] = %p = %s\n", i, |
5195d8e2 EP |
2090 | n->name, n->name ?: "(null)"); |
2091 | } | |
1da177e4 LT |
2092 | #endif |
2093 | __putname(name); | |
2094 | } | |
2095 | #if AUDIT_DEBUG | |
2096 | else { | |
2097 | ++context->put_count; | |
2098 | if (context->put_count > context->name_count) { | |
2099 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
2100 | " in_syscall=%d putname(%p) name_count=%d" | |
2101 | " put_count=%d\n", | |
2102 | __FILE__, __LINE__, | |
2103 | context->serial, context->major, | |
2104 | context->in_syscall, name, context->name_count, | |
2105 | context->put_count); | |
2106 | dump_stack(); | |
2107 | } | |
2108 | } | |
2109 | #endif | |
2110 | } | |
2111 | ||
851f7ff5 EP |
2112 | static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) |
2113 | { | |
2114 | struct cpu_vfs_cap_data caps; | |
2115 | int rc; | |
2116 | ||
851f7ff5 EP |
2117 | if (!dentry) |
2118 | return 0; | |
2119 | ||
2120 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
2121 | if (rc) | |
2122 | return rc; | |
2123 | ||
2124 | name->fcap.permitted = caps.permitted; | |
2125 | name->fcap.inheritable = caps.inheritable; | |
2126 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2127 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2128 | ||
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | ||
3e2efce0 | 2133 | /* Copy inode data into an audit_names. */ |
851f7ff5 EP |
2134 | static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
2135 | const struct inode *inode) | |
8c8570fb | 2136 | { |
3e2efce0 AG |
2137 | name->ino = inode->i_ino; |
2138 | name->dev = inode->i_sb->s_dev; | |
2139 | name->mode = inode->i_mode; | |
2140 | name->uid = inode->i_uid; | |
2141 | name->gid = inode->i_gid; | |
2142 | name->rdev = inode->i_rdev; | |
2a862b32 | 2143 | security_inode_getsecid(inode, &name->osid); |
851f7ff5 | 2144 | audit_copy_fcaps(name, dentry); |
8c8570fb DK |
2145 | } |
2146 | ||
b0dd25a8 RD |
2147 | /** |
2148 | * audit_inode - store the inode and device from a lookup | |
2149 | * @name: name being audited | |
481968f4 | 2150 | * @dentry: dentry being audited |
b0dd25a8 RD |
2151 | * |
2152 | * Called from fs/namei.c:path_lookup(). | |
2153 | */ | |
5a190ae6 | 2154 | void __audit_inode(const char *name, const struct dentry *dentry) |
1da177e4 | 2155 | { |
1da177e4 | 2156 | struct audit_context *context = current->audit_context; |
74c3cbe3 | 2157 | const struct inode *inode = dentry->d_inode; |
5195d8e2 | 2158 | struct audit_names *n; |
1da177e4 LT |
2159 | |
2160 | if (!context->in_syscall) | |
2161 | return; | |
5195d8e2 EP |
2162 | |
2163 | list_for_each_entry_reverse(n, &context->names_list, list) { | |
2164 | if (n->name && (n->name == name)) | |
2165 | goto out; | |
1da177e4 | 2166 | } |
5195d8e2 EP |
2167 | |
2168 | /* unable to find the name from a previous getname() */ | |
2169 | n = audit_alloc_name(context); | |
2170 | if (!n) | |
2171 | return; | |
2172 | out: | |
74c3cbe3 | 2173 | handle_path(dentry); |
5195d8e2 | 2174 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
2175 | } |
2176 | ||
2177 | /** | |
2178 | * audit_inode_child - collect inode info for created/removed objects | |
481968f4 | 2179 | * @dentry: dentry being audited |
73d3ec5a | 2180 | * @parent: inode of dentry parent |
73241ccc AG |
2181 | * |
2182 | * For syscalls that create or remove filesystem objects, audit_inode | |
2183 | * can only collect information for the filesystem object's parent. | |
2184 | * This call updates the audit context with the child's information. | |
2185 | * Syscalls that create a new filesystem object must be hooked after | |
2186 | * the object is created. Syscalls that remove a filesystem object | |
2187 | * must be hooked prior, in order to capture the target inode during | |
2188 | * unsuccessful attempts. | |
2189 | */ | |
cccc6bba | 2190 | void __audit_inode_child(const struct dentry *dentry, |
73d3ec5a | 2191 | const struct inode *parent) |
73241ccc | 2192 | { |
73241ccc | 2193 | struct audit_context *context = current->audit_context; |
5712e88f | 2194 | const char *found_parent = NULL, *found_child = NULL; |
5a190ae6 | 2195 | const struct inode *inode = dentry->d_inode; |
cccc6bba | 2196 | const char *dname = dentry->d_name.name; |
5195d8e2 | 2197 | struct audit_names *n; |
9c937dcc | 2198 | int dirlen = 0; |
73241ccc AG |
2199 | |
2200 | if (!context->in_syscall) | |
2201 | return; | |
2202 | ||
74c3cbe3 AV |
2203 | if (inode) |
2204 | handle_one(inode); | |
73241ccc | 2205 | |
5712e88f | 2206 | /* parent is more likely, look for it first */ |
5195d8e2 | 2207 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2208 | if (!n->name) |
2209 | continue; | |
2210 | ||
2211 | if (n->ino == parent->i_ino && | |
2212 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2213 | n->name_len = dirlen; /* update parent data in place */ | |
2214 | found_parent = n->name; | |
2215 | goto add_names; | |
f368c07d | 2216 | } |
5712e88f | 2217 | } |
73241ccc | 2218 | |
5712e88f | 2219 | /* no matching parent, look for matching child */ |
5195d8e2 | 2220 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2221 | if (!n->name) |
2222 | continue; | |
2223 | ||
2224 | /* strcmp() is the more likely scenario */ | |
2225 | if (!strcmp(dname, n->name) || | |
2226 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2227 | if (inode) | |
851f7ff5 | 2228 | audit_copy_inode(n, NULL, inode); |
5712e88f AG |
2229 | else |
2230 | n->ino = (unsigned long)-1; | |
2231 | found_child = n->name; | |
2232 | goto add_names; | |
2233 | } | |
ac9910ce | 2234 | } |
5712e88f AG |
2235 | |
2236 | add_names: | |
2237 | if (!found_parent) { | |
5195d8e2 EP |
2238 | n = audit_alloc_name(context); |
2239 | if (!n) | |
ac9910ce | 2240 | return; |
5195d8e2 | 2241 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 2242 | } |
5712e88f AG |
2243 | |
2244 | if (!found_child) { | |
5195d8e2 EP |
2245 | n = audit_alloc_name(context); |
2246 | if (!n) | |
5712e88f | 2247 | return; |
5712e88f AG |
2248 | |
2249 | /* Re-use the name belonging to the slot for a matching parent | |
2250 | * directory. All names for this context are relinquished in | |
2251 | * audit_free_names() */ | |
2252 | if (found_parent) { | |
5195d8e2 EP |
2253 | n->name = found_parent; |
2254 | n->name_len = AUDIT_NAME_FULL; | |
5712e88f | 2255 | /* don't call __putname() */ |
5195d8e2 | 2256 | n->name_put = false; |
5712e88f AG |
2257 | } |
2258 | ||
2259 | if (inode) | |
5195d8e2 | 2260 | audit_copy_inode(n, NULL, inode); |
5712e88f | 2261 | } |
3e2efce0 | 2262 | } |
50e437d5 | 2263 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2264 | |
b0dd25a8 RD |
2265 | /** |
2266 | * auditsc_get_stamp - get local copies of audit_context values | |
2267 | * @ctx: audit_context for the task | |
2268 | * @t: timespec to store time recorded in the audit_context | |
2269 | * @serial: serial value that is recorded in the audit_context | |
2270 | * | |
2271 | * Also sets the context as auditable. | |
2272 | */ | |
48887e63 | 2273 | int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e | 2274 | struct timespec *t, unsigned int *serial) |
1da177e4 | 2275 | { |
48887e63 AV |
2276 | if (!ctx->in_syscall) |
2277 | return 0; | |
ce625a80 DW |
2278 | if (!ctx->serial) |
2279 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2280 | t->tv_sec = ctx->ctime.tv_sec; |
2281 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2282 | *serial = ctx->serial; | |
0590b933 AV |
2283 | if (!ctx->prio) { |
2284 | ctx->prio = 1; | |
2285 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
2286 | } | |
48887e63 | 2287 | return 1; |
1da177e4 LT |
2288 | } |
2289 | ||
4746ec5b EP |
2290 | /* global counter which is incremented every time something logs in */ |
2291 | static atomic_t session_id = ATOMIC_INIT(0); | |
2292 | ||
b0dd25a8 | 2293 | /** |
0a300be6 | 2294 | * audit_set_loginuid - set current task's audit_context loginuid |
b0dd25a8 RD |
2295 | * @loginuid: loginuid value |
2296 | * | |
2297 | * Returns 0. | |
2298 | * | |
2299 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2300 | */ | |
0a300be6 | 2301 | int audit_set_loginuid(uid_t loginuid) |
1da177e4 | 2302 | { |
0a300be6 | 2303 | struct task_struct *task = current; |
41757106 | 2304 | struct audit_context *context = task->audit_context; |
633b4545 | 2305 | unsigned int sessionid; |
41757106 | 2306 | |
633b4545 EP |
2307 | #ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE |
2308 | if (task->loginuid != -1) | |
2309 | return -EPERM; | |
2310 | #else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2311 | if (!capable(CAP_AUDIT_CONTROL)) | |
2312 | return -EPERM; | |
2313 | #endif /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */ | |
2314 | ||
2315 | sessionid = atomic_inc_return(&session_id); | |
bfef93a5 AV |
2316 | if (context && context->in_syscall) { |
2317 | struct audit_buffer *ab; | |
2318 | ||
2319 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
2320 | if (ab) { | |
2321 | audit_log_format(ab, "login pid=%d uid=%u " | |
4746ec5b EP |
2322 | "old auid=%u new auid=%u" |
2323 | " old ses=%u new ses=%u", | |
c69e8d9c | 2324 | task->pid, task_uid(task), |
4746ec5b EP |
2325 | task->loginuid, loginuid, |
2326 | task->sessionid, sessionid); | |
bfef93a5 | 2327 | audit_log_end(ab); |
c0404993 | 2328 | } |
1da177e4 | 2329 | } |
4746ec5b | 2330 | task->sessionid = sessionid; |
bfef93a5 | 2331 | task->loginuid = loginuid; |
1da177e4 LT |
2332 | return 0; |
2333 | } | |
2334 | ||
20ca73bc GW |
2335 | /** |
2336 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2337 | * @oflag: open flag | |
2338 | * @mode: mode bits | |
6b962559 | 2339 | * @attr: queue attributes |
20ca73bc | 2340 | * |
20ca73bc | 2341 | */ |
df0a4283 | 2342 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2343 | { |
20ca73bc GW |
2344 | struct audit_context *context = current->audit_context; |
2345 | ||
564f6993 AV |
2346 | if (attr) |
2347 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2348 | else | |
2349 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2350 | |
564f6993 AV |
2351 | context->mq_open.oflag = oflag; |
2352 | context->mq_open.mode = mode; | |
20ca73bc | 2353 | |
564f6993 | 2354 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2355 | } |
2356 | ||
2357 | /** | |
c32c8af4 | 2358 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2359 | * @mqdes: MQ descriptor |
2360 | * @msg_len: Message length | |
2361 | * @msg_prio: Message priority | |
c32c8af4 | 2362 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2363 | * |
20ca73bc | 2364 | */ |
c32c8af4 AV |
2365 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
2366 | const struct timespec *abs_timeout) | |
20ca73bc | 2367 | { |
20ca73bc | 2368 | struct audit_context *context = current->audit_context; |
c32c8af4 | 2369 | struct timespec *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2370 | |
c32c8af4 AV |
2371 | if (abs_timeout) |
2372 | memcpy(p, abs_timeout, sizeof(struct timespec)); | |
2373 | else | |
2374 | memset(p, 0, sizeof(struct timespec)); | |
20ca73bc | 2375 | |
c32c8af4 AV |
2376 | context->mq_sendrecv.mqdes = mqdes; |
2377 | context->mq_sendrecv.msg_len = msg_len; | |
2378 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2379 | |
c32c8af4 | 2380 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2381 | } |
2382 | ||
2383 | /** | |
2384 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2385 | * @mqdes: MQ descriptor | |
6b962559 | 2386 | * @notification: Notification event |
20ca73bc | 2387 | * |
20ca73bc GW |
2388 | */ |
2389 | ||
20114f71 | 2390 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2391 | { |
20ca73bc GW |
2392 | struct audit_context *context = current->audit_context; |
2393 | ||
20114f71 AV |
2394 | if (notification) |
2395 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2396 | else | |
2397 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2398 | |
20114f71 AV |
2399 | context->mq_notify.mqdes = mqdes; |
2400 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2401 | } |
2402 | ||
2403 | /** | |
2404 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2405 | * @mqdes: MQ descriptor | |
2406 | * @mqstat: MQ flags | |
2407 | * | |
20ca73bc | 2408 | */ |
7392906e | 2409 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2410 | { |
20ca73bc | 2411 | struct audit_context *context = current->audit_context; |
7392906e AV |
2412 | context->mq_getsetattr.mqdes = mqdes; |
2413 | context->mq_getsetattr.mqstat = *mqstat; | |
2414 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2415 | } |
2416 | ||
b0dd25a8 | 2417 | /** |
073115d6 SG |
2418 | * audit_ipc_obj - record audit data for ipc object |
2419 | * @ipcp: ipc permissions | |
2420 | * | |
073115d6 | 2421 | */ |
a33e6751 | 2422 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2423 | { |
073115d6 | 2424 | struct audit_context *context = current->audit_context; |
a33e6751 AV |
2425 | context->ipc.uid = ipcp->uid; |
2426 | context->ipc.gid = ipcp->gid; | |
2427 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2428 | context->ipc.has_perm = 0; |
a33e6751 AV |
2429 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2430 | context->type = AUDIT_IPC; | |
073115d6 SG |
2431 | } |
2432 | ||
2433 | /** | |
2434 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
2435 | * @qbytes: msgq bytes |
2436 | * @uid: msgq user id | |
2437 | * @gid: msgq group id | |
2438 | * @mode: msgq mode (permissions) | |
2439 | * | |
e816f370 | 2440 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2441 | */ |
2570ebbd | 2442 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2443 | { |
1da177e4 LT |
2444 | struct audit_context *context = current->audit_context; |
2445 | ||
e816f370 AV |
2446 | context->ipc.qbytes = qbytes; |
2447 | context->ipc.perm_uid = uid; | |
2448 | context->ipc.perm_gid = gid; | |
2449 | context->ipc.perm_mode = mode; | |
2450 | context->ipc.has_perm = 1; | |
1da177e4 | 2451 | } |
c2f0c7c3 | 2452 | |
07c49417 | 2453 | int __audit_bprm(struct linux_binprm *bprm) |
473ae30b AV |
2454 | { |
2455 | struct audit_aux_data_execve *ax; | |
2456 | struct audit_context *context = current->audit_context; | |
473ae30b | 2457 | |
bdf4c48a | 2458 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); |
473ae30b AV |
2459 | if (!ax) |
2460 | return -ENOMEM; | |
2461 | ||
2462 | ax->argc = bprm->argc; | |
2463 | ax->envc = bprm->envc; | |
bdf4c48a | 2464 | ax->mm = bprm->mm; |
473ae30b AV |
2465 | ax->d.type = AUDIT_EXECVE; |
2466 | ax->d.next = context->aux; | |
2467 | context->aux = (void *)ax; | |
2468 | return 0; | |
2469 | } | |
2470 | ||
2471 | ||
b0dd25a8 RD |
2472 | /** |
2473 | * audit_socketcall - record audit data for sys_socketcall | |
2474 | * @nargs: number of args | |
2475 | * @args: args array | |
2476 | * | |
b0dd25a8 | 2477 | */ |
07c49417 | 2478 | void __audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2479 | { |
3ec3b2fb DW |
2480 | struct audit_context *context = current->audit_context; |
2481 | ||
f3298dc4 AV |
2482 | context->type = AUDIT_SOCKETCALL; |
2483 | context->socketcall.nargs = nargs; | |
2484 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
3ec3b2fb DW |
2485 | } |
2486 | ||
db349509 AV |
2487 | /** |
2488 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2489 | * @fd1: the first file descriptor | |
2490 | * @fd2: the second file descriptor | |
2491 | * | |
db349509 | 2492 | */ |
157cf649 | 2493 | void __audit_fd_pair(int fd1, int fd2) |
db349509 AV |
2494 | { |
2495 | struct audit_context *context = current->audit_context; | |
157cf649 AV |
2496 | context->fds[0] = fd1; |
2497 | context->fds[1] = fd2; | |
db349509 AV |
2498 | } |
2499 | ||
b0dd25a8 RD |
2500 | /** |
2501 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
2502 | * @len: data length in user space | |
2503 | * @a: data address in kernel space | |
2504 | * | |
2505 | * Returns 0 for success or NULL context or < 0 on error. | |
2506 | */ | |
07c49417 | 2507 | int __audit_sockaddr(int len, void *a) |
3ec3b2fb | 2508 | { |
3ec3b2fb DW |
2509 | struct audit_context *context = current->audit_context; |
2510 | ||
4f6b434f AV |
2511 | if (!context->sockaddr) { |
2512 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2513 | if (!p) | |
2514 | return -ENOMEM; | |
2515 | context->sockaddr = p; | |
2516 | } | |
3ec3b2fb | 2517 | |
4f6b434f AV |
2518 | context->sockaddr_len = len; |
2519 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2520 | return 0; |
2521 | } | |
2522 | ||
a5cb013d AV |
2523 | void __audit_ptrace(struct task_struct *t) |
2524 | { | |
2525 | struct audit_context *context = current->audit_context; | |
2526 | ||
2527 | context->target_pid = t->pid; | |
c2a7780e | 2528 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2529 | context->target_uid = task_uid(t); |
4746ec5b | 2530 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2531 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2532 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2533 | } |
2534 | ||
b0dd25a8 RD |
2535 | /** |
2536 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2537 | * @sig: signal value | |
2538 | * @t: task being signaled | |
2539 | * | |
2540 | * If the audit subsystem is being terminated, record the task (pid) | |
2541 | * and uid that is doing that. | |
2542 | */ | |
e54dc243 | 2543 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2544 | { |
e54dc243 AG |
2545 | struct audit_aux_data_pids *axp; |
2546 | struct task_struct *tsk = current; | |
2547 | struct audit_context *ctx = tsk->audit_context; | |
c69e8d9c | 2548 | uid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065 | 2549 | |
175fc484 | 2550 | if (audit_pid && t->tgid == audit_pid) { |
ee1d3156 | 2551 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
175fc484 | 2552 | audit_sig_pid = tsk->pid; |
bfef93a5 AV |
2553 | if (tsk->loginuid != -1) |
2554 | audit_sig_uid = tsk->loginuid; | |
175fc484 | 2555 | else |
c69e8d9c | 2556 | audit_sig_uid = uid; |
2a862b32 | 2557 | security_task_getsecid(tsk, &audit_sig_sid); |
175fc484 AV |
2558 | } |
2559 | if (!audit_signals || audit_dummy_context()) | |
2560 | return 0; | |
c2f0c7c3 | 2561 | } |
e54dc243 | 2562 | |
e54dc243 AG |
2563 | /* optimize the common case by putting first signal recipient directly |
2564 | * in audit_context */ | |
2565 | if (!ctx->target_pid) { | |
2566 | ctx->target_pid = t->tgid; | |
c2a7780e | 2567 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2568 | ctx->target_uid = t_uid; |
4746ec5b | 2569 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2570 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2571 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2572 | return 0; |
2573 | } | |
2574 | ||
2575 | axp = (void *)ctx->aux_pids; | |
2576 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2577 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2578 | if (!axp) | |
2579 | return -ENOMEM; | |
2580 | ||
2581 | axp->d.type = AUDIT_OBJ_PID; | |
2582 | axp->d.next = ctx->aux_pids; | |
2583 | ctx->aux_pids = (void *)axp; | |
2584 | } | |
88ae704c | 2585 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2586 | |
2587 | axp->target_pid[axp->pid_count] = t->tgid; | |
c2a7780e | 2588 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2589 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2590 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2591 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2592 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2593 | axp->pid_count++; |
2594 | ||
2595 | return 0; | |
c2f0c7c3 | 2596 | } |
0a4ff8c2 | 2597 | |
3fc689e9 EP |
2598 | /** |
2599 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2600 | * @bprm: pointer to the bprm being processed |
2601 | * @new: the proposed new credentials | |
2602 | * @old: the old credentials | |
3fc689e9 EP |
2603 | * |
2604 | * Simply check if the proc already has the caps given by the file and if not | |
2605 | * store the priv escalation info for later auditing at the end of the syscall | |
2606 | * | |
3fc689e9 EP |
2607 | * -Eric |
2608 | */ | |
d84f4f99 DH |
2609 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2610 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2611 | { |
2612 | struct audit_aux_data_bprm_fcaps *ax; | |
2613 | struct audit_context *context = current->audit_context; | |
2614 | struct cpu_vfs_cap_data vcaps; | |
2615 | struct dentry *dentry; | |
2616 | ||
2617 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2618 | if (!ax) | |
d84f4f99 | 2619 | return -ENOMEM; |
3fc689e9 EP |
2620 | |
2621 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2622 | ax->d.next = context->aux; | |
2623 | context->aux = (void *)ax; | |
2624 | ||
2625 | dentry = dget(bprm->file->f_dentry); | |
2626 | get_vfs_caps_from_disk(dentry, &vcaps); | |
2627 | dput(dentry); | |
2628 | ||
2629 | ax->fcap.permitted = vcaps.permitted; | |
2630 | ax->fcap.inheritable = vcaps.inheritable; | |
2631 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2632 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2633 | ||
d84f4f99 DH |
2634 | ax->old_pcap.permitted = old->cap_permitted; |
2635 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2636 | ax->old_pcap.effective = old->cap_effective; | |
3fc689e9 | 2637 | |
d84f4f99 DH |
2638 | ax->new_pcap.permitted = new->cap_permitted; |
2639 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2640 | ax->new_pcap.effective = new->cap_effective; | |
2641 | return 0; | |
3fc689e9 EP |
2642 | } |
2643 | ||
e68b75a0 EP |
2644 | /** |
2645 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2646 | * @pid: target pid of the capset call |
2647 | * @new: the new credentials | |
2648 | * @old: the old (current) credentials | |
e68b75a0 EP |
2649 | * |
2650 | * Record the aguments userspace sent to sys_capset for later printing by the | |
2651 | * audit system if applicable | |
2652 | */ | |
57f71a0a | 2653 | void __audit_log_capset(pid_t pid, |
d84f4f99 | 2654 | const struct cred *new, const struct cred *old) |
e68b75a0 | 2655 | { |
e68b75a0 | 2656 | struct audit_context *context = current->audit_context; |
57f71a0a AV |
2657 | context->capset.pid = pid; |
2658 | context->capset.cap.effective = new->cap_effective; | |
2659 | context->capset.cap.inheritable = new->cap_effective; | |
2660 | context->capset.cap.permitted = new->cap_permitted; | |
2661 | context->type = AUDIT_CAPSET; | |
e68b75a0 EP |
2662 | } |
2663 | ||
120a795d AV |
2664 | void __audit_mmap_fd(int fd, int flags) |
2665 | { | |
2666 | struct audit_context *context = current->audit_context; | |
2667 | context->mmap.fd = fd; | |
2668 | context->mmap.flags = flags; | |
2669 | context->type = AUDIT_MMAP; | |
2670 | } | |
2671 | ||
85e7bac3 EP |
2672 | static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr) |
2673 | { | |
2674 | uid_t auid, uid; | |
2675 | gid_t gid; | |
2676 | unsigned int sessionid; | |
2677 | ||
2678 | auid = audit_get_loginuid(current); | |
2679 | sessionid = audit_get_sessionid(current); | |
2680 | current_uid_gid(&uid, &gid); | |
2681 | ||
2682 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", | |
2683 | auid, uid, gid, sessionid); | |
2684 | audit_log_task_context(ab); | |
2685 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2686 | audit_log_untrustedstring(ab, current->comm); | |
2687 | audit_log_format(ab, " reason="); | |
2688 | audit_log_string(ab, reason); | |
2689 | audit_log_format(ab, " sig=%ld", signr); | |
2690 | } | |
0a4ff8c2 SG |
2691 | /** |
2692 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2693 | * @signr: signal value |
0a4ff8c2 SG |
2694 | * |
2695 | * If a process ends with a core dump, something fishy is going on and we | |
2696 | * should record the event for investigation. | |
2697 | */ | |
2698 | void audit_core_dumps(long signr) | |
2699 | { | |
2700 | struct audit_buffer *ab; | |
0a4ff8c2 SG |
2701 | |
2702 | if (!audit_enabled) | |
2703 | return; | |
2704 | ||
2705 | if (signr == SIGQUIT) /* don't care for those */ | |
2706 | return; | |
2707 | ||
2708 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
85e7bac3 EP |
2709 | audit_log_abend(ab, "memory violation", signr); |
2710 | audit_log_end(ab); | |
2711 | } | |
0a4ff8c2 | 2712 | |
85e7bac3 EP |
2713 | void __audit_seccomp(unsigned long syscall) |
2714 | { | |
2715 | struct audit_buffer *ab; | |
2716 | ||
2717 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
2718 | audit_log_abend(ab, "seccomp", SIGKILL); | |
2719 | audit_log_format(ab, " syscall=%ld", syscall); | |
0a4ff8c2 SG |
2720 | audit_log_end(ab); |
2721 | } | |
916d7576 AV |
2722 | |
2723 | struct list_head *audit_killed_trees(void) | |
2724 | { | |
2725 | struct audit_context *ctx = current->audit_context; | |
2726 | if (likely(!ctx || !ctx->in_syscall)) | |
2727 | return NULL; | |
2728 | return &ctx->killed_trees; | |
2729 | } |