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 | |
1da177e4 | 73 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
5195d8e2 EP |
74 | * for saving names from getname(). If we get more names we will allocate |
75 | * a name dynamically and also add those to the list anchored by names_list. */ | |
76 | #define AUDIT_NAMES 5 | |
1da177e4 | 77 | |
9c937dcc AG |
78 | /* Indicates that audit should log the full pathname. */ |
79 | #define AUDIT_NAME_FULL -1 | |
80 | ||
de6bbd1d EP |
81 | /* no execve audit message should be longer than this (userspace limits) */ |
82 | #define MAX_EXECVE_AUDIT_LEN 7500 | |
83 | ||
471a5c7c AV |
84 | /* number of audit rules */ |
85 | int audit_n_rules; | |
86 | ||
e54dc243 AG |
87 | /* determines whether we collect data for signals sent */ |
88 | int audit_signals; | |
89 | ||
851f7ff5 EP |
90 | struct audit_cap_data { |
91 | kernel_cap_t permitted; | |
92 | kernel_cap_t inheritable; | |
93 | union { | |
94 | unsigned int fE; /* effective bit of a file capability */ | |
95 | kernel_cap_t effective; /* effective set of a process */ | |
96 | }; | |
97 | }; | |
98 | ||
1da177e4 LT |
99 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
100 | * we don't let putname() free it (instead we free all of the saved | |
101 | * pointers at syscall exit time). | |
102 | * | |
103 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
104 | struct audit_names { | |
5195d8e2 | 105 | struct list_head list; /* audit_context->names_list */ |
1da177e4 LT |
106 | const char *name; |
107 | unsigned long ino; | |
108 | dev_t dev; | |
109 | umode_t mode; | |
110 | uid_t uid; | |
111 | gid_t gid; | |
112 | dev_t rdev; | |
1b50eed9 | 113 | u32 osid; |
851f7ff5 EP |
114 | struct audit_cap_data fcap; |
115 | unsigned int fcap_ver; | |
5195d8e2 EP |
116 | int name_len; /* number of name's characters to log */ |
117 | bool name_put; /* call __putname() for this name */ | |
118 | /* | |
119 | * This was an allocated audit_names and not from the array of | |
120 | * names allocated in the task audit context. Thus this name | |
121 | * should be freed on syscall exit | |
122 | */ | |
123 | bool should_free; | |
1da177e4 LT |
124 | }; |
125 | ||
126 | struct audit_aux_data { | |
127 | struct audit_aux_data *next; | |
128 | int type; | |
129 | }; | |
130 | ||
131 | #define AUDIT_AUX_IPCPERM 0 | |
132 | ||
e54dc243 AG |
133 | /* Number of target pids per aux struct. */ |
134 | #define AUDIT_AUX_PIDS 16 | |
135 | ||
473ae30b AV |
136 | struct audit_aux_data_execve { |
137 | struct audit_aux_data d; | |
138 | int argc; | |
139 | int envc; | |
bdf4c48a | 140 | struct mm_struct *mm; |
473ae30b AV |
141 | }; |
142 | ||
e54dc243 AG |
143 | struct audit_aux_data_pids { |
144 | struct audit_aux_data d; | |
145 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
c2a7780e EP |
146 | uid_t target_auid[AUDIT_AUX_PIDS]; |
147 | uid_t target_uid[AUDIT_AUX_PIDS]; | |
4746ec5b | 148 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 149 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 150 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
151 | int pid_count; |
152 | }; | |
153 | ||
3fc689e9 EP |
154 | struct audit_aux_data_bprm_fcaps { |
155 | struct audit_aux_data d; | |
156 | struct audit_cap_data fcap; | |
157 | unsigned int fcap_ver; | |
158 | struct audit_cap_data old_pcap; | |
159 | struct audit_cap_data new_pcap; | |
160 | }; | |
161 | ||
e68b75a0 EP |
162 | struct audit_aux_data_capset { |
163 | struct audit_aux_data d; | |
164 | pid_t pid; | |
165 | struct audit_cap_data cap; | |
166 | }; | |
167 | ||
74c3cbe3 AV |
168 | struct audit_tree_refs { |
169 | struct audit_tree_refs *next; | |
170 | struct audit_chunk *c[31]; | |
171 | }; | |
172 | ||
1da177e4 LT |
173 | /* The per-task audit context. */ |
174 | struct audit_context { | |
d51374ad | 175 | int dummy; /* must be the first element */ |
1da177e4 | 176 | int in_syscall; /* 1 if task is in a syscall */ |
0590b933 | 177 | enum audit_state state, current_state; |
1da177e4 | 178 | unsigned int serial; /* serial number for record */ |
1da177e4 | 179 | int major; /* syscall number */ |
44e51a1b | 180 | struct timespec ctime; /* time of syscall entry */ |
1da177e4 | 181 | unsigned long argv[4]; /* syscall arguments */ |
2fd6f58b | 182 | long return_code;/* syscall return code */ |
0590b933 | 183 | u64 prio; |
44e51a1b | 184 | int return_valid; /* return code is valid */ |
5195d8e2 EP |
185 | /* |
186 | * The names_list is the list of all audit_names collected during this | |
187 | * syscall. The first AUDIT_NAMES entries in the names_list will | |
188 | * actually be from the preallocated_names array for performance | |
189 | * reasons. Except during allocation they should never be referenced | |
190 | * through the preallocated_names array and should only be found/used | |
191 | * by running the names_list. | |
192 | */ | |
193 | struct audit_names preallocated_names[AUDIT_NAMES]; | |
194 | int name_count; /* total records in names_list */ | |
195 | struct list_head names_list; /* anchor for struct audit_names->list */ | |
5adc8a6a | 196 | char * filterkey; /* key for rule that triggered record */ |
44707fdf | 197 | struct path pwd; |
1da177e4 LT |
198 | struct audit_context *previous; /* For nested syscalls */ |
199 | struct audit_aux_data *aux; | |
e54dc243 | 200 | struct audit_aux_data *aux_pids; |
4f6b434f AV |
201 | struct sockaddr_storage *sockaddr; |
202 | size_t sockaddr_len; | |
1da177e4 | 203 | /* Save things to print about task_struct */ |
f46038ff | 204 | pid_t pid, ppid; |
1da177e4 LT |
205 | uid_t uid, euid, suid, fsuid; |
206 | gid_t gid, egid, sgid, fsgid; | |
207 | unsigned long personality; | |
2fd6f58b | 208 | int arch; |
1da177e4 | 209 | |
a5cb013d | 210 | pid_t target_pid; |
c2a7780e EP |
211 | uid_t target_auid; |
212 | uid_t target_uid; | |
4746ec5b | 213 | unsigned int target_sessionid; |
a5cb013d | 214 | u32 target_sid; |
c2a7780e | 215 | char target_comm[TASK_COMM_LEN]; |
a5cb013d | 216 | |
74c3cbe3 | 217 | struct audit_tree_refs *trees, *first_trees; |
916d7576 | 218 | struct list_head killed_trees; |
44e51a1b | 219 | int tree_count; |
74c3cbe3 | 220 | |
f3298dc4 AV |
221 | int type; |
222 | union { | |
223 | struct { | |
224 | int nargs; | |
225 | long args[6]; | |
226 | } socketcall; | |
a33e6751 AV |
227 | struct { |
228 | uid_t uid; | |
229 | gid_t gid; | |
2570ebbd | 230 | umode_t mode; |
a33e6751 | 231 | u32 osid; |
e816f370 AV |
232 | int has_perm; |
233 | uid_t perm_uid; | |
234 | gid_t perm_gid; | |
2570ebbd | 235 | umode_t perm_mode; |
e816f370 | 236 | unsigned long qbytes; |
a33e6751 | 237 | } ipc; |
7392906e AV |
238 | struct { |
239 | mqd_t mqdes; | |
240 | struct mq_attr mqstat; | |
241 | } mq_getsetattr; | |
20114f71 AV |
242 | struct { |
243 | mqd_t mqdes; | |
244 | int sigev_signo; | |
245 | } mq_notify; | |
c32c8af4 AV |
246 | struct { |
247 | mqd_t mqdes; | |
248 | size_t msg_len; | |
249 | unsigned int msg_prio; | |
250 | struct timespec abs_timeout; | |
251 | } mq_sendrecv; | |
564f6993 AV |
252 | struct { |
253 | int oflag; | |
df0a4283 | 254 | umode_t mode; |
564f6993 AV |
255 | struct mq_attr attr; |
256 | } mq_open; | |
57f71a0a AV |
257 | struct { |
258 | pid_t pid; | |
259 | struct audit_cap_data cap; | |
260 | } capset; | |
120a795d AV |
261 | struct { |
262 | int fd; | |
263 | int flags; | |
264 | } mmap; | |
f3298dc4 | 265 | }; |
157cf649 | 266 | int fds[2]; |
f3298dc4 | 267 | |
1da177e4 LT |
268 | #if AUDIT_DEBUG |
269 | int put_count; | |
270 | int ino_count; | |
271 | #endif | |
272 | }; | |
273 | ||
55669bfa AV |
274 | static inline int open_arg(int flags, int mask) |
275 | { | |
276 | int n = ACC_MODE(flags); | |
277 | if (flags & (O_TRUNC | O_CREAT)) | |
278 | n |= AUDIT_PERM_WRITE; | |
279 | return n & mask; | |
280 | } | |
281 | ||
282 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
283 | { | |
c4bacefb | 284 | unsigned n; |
1a61c88d | 285 | if (unlikely(!ctx)) |
286 | return 0; | |
c4bacefb | 287 | n = ctx->major; |
dbda4c0b | 288 | |
55669bfa AV |
289 | switch (audit_classify_syscall(ctx->arch, n)) { |
290 | case 0: /* native */ | |
291 | if ((mask & AUDIT_PERM_WRITE) && | |
292 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
293 | return 1; | |
294 | if ((mask & AUDIT_PERM_READ) && | |
295 | audit_match_class(AUDIT_CLASS_READ, n)) | |
296 | return 1; | |
297 | if ((mask & AUDIT_PERM_ATTR) && | |
298 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
299 | return 1; | |
300 | return 0; | |
301 | case 1: /* 32bit on biarch */ | |
302 | if ((mask & AUDIT_PERM_WRITE) && | |
303 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
304 | return 1; | |
305 | if ((mask & AUDIT_PERM_READ) && | |
306 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
307 | return 1; | |
308 | if ((mask & AUDIT_PERM_ATTR) && | |
309 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
310 | return 1; | |
311 | return 0; | |
312 | case 2: /* open */ | |
313 | return mask & ACC_MODE(ctx->argv[1]); | |
314 | case 3: /* openat */ | |
315 | return mask & ACC_MODE(ctx->argv[2]); | |
316 | case 4: /* socketcall */ | |
317 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
318 | case 5: /* execve */ | |
319 | return mask & AUDIT_PERM_EXEC; | |
320 | default: | |
321 | return 0; | |
322 | } | |
323 | } | |
324 | ||
5ef30ee5 | 325 | static int audit_match_filetype(struct audit_context *ctx, int val) |
8b67dca9 | 326 | { |
5195d8e2 | 327 | struct audit_names *n; |
5ef30ee5 | 328 | umode_t mode = (umode_t)val; |
1a61c88d | 329 | |
330 | if (unlikely(!ctx)) | |
331 | return 0; | |
332 | ||
5195d8e2 EP |
333 | list_for_each_entry(n, &ctx->names_list, list) { |
334 | if ((n->ino != -1) && | |
335 | ((n->mode & S_IFMT) == mode)) | |
5ef30ee5 EP |
336 | return 1; |
337 | } | |
5195d8e2 | 338 | |
5ef30ee5 | 339 | return 0; |
8b67dca9 AV |
340 | } |
341 | ||
74c3cbe3 AV |
342 | /* |
343 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
344 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
345 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
346 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
347 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
348 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
349 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
350 | */ | |
351 | ||
352 | #ifdef CONFIG_AUDIT_TREE | |
679173b7 EP |
353 | static void audit_set_auditable(struct audit_context *ctx) |
354 | { | |
355 | if (!ctx->prio) { | |
356 | ctx->prio = 1; | |
357 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
358 | } | |
359 | } | |
360 | ||
74c3cbe3 AV |
361 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) |
362 | { | |
363 | struct audit_tree_refs *p = ctx->trees; | |
364 | int left = ctx->tree_count; | |
365 | if (likely(left)) { | |
366 | p->c[--left] = chunk; | |
367 | ctx->tree_count = left; | |
368 | return 1; | |
369 | } | |
370 | if (!p) | |
371 | return 0; | |
372 | p = p->next; | |
373 | if (p) { | |
374 | p->c[30] = chunk; | |
375 | ctx->trees = p; | |
376 | ctx->tree_count = 30; | |
377 | return 1; | |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int grow_tree_refs(struct audit_context *ctx) | |
383 | { | |
384 | struct audit_tree_refs *p = ctx->trees; | |
385 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
386 | if (!ctx->trees) { | |
387 | ctx->trees = p; | |
388 | return 0; | |
389 | } | |
390 | if (p) | |
391 | p->next = ctx->trees; | |
392 | else | |
393 | ctx->first_trees = ctx->trees; | |
394 | ctx->tree_count = 31; | |
395 | return 1; | |
396 | } | |
397 | #endif | |
398 | ||
399 | static void unroll_tree_refs(struct audit_context *ctx, | |
400 | struct audit_tree_refs *p, int count) | |
401 | { | |
402 | #ifdef CONFIG_AUDIT_TREE | |
403 | struct audit_tree_refs *q; | |
404 | int n; | |
405 | if (!p) { | |
406 | /* we started with empty chain */ | |
407 | p = ctx->first_trees; | |
408 | count = 31; | |
409 | /* if the very first allocation has failed, nothing to do */ | |
410 | if (!p) | |
411 | return; | |
412 | } | |
413 | n = count; | |
414 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
415 | while (n--) { | |
416 | audit_put_chunk(q->c[n]); | |
417 | q->c[n] = NULL; | |
418 | } | |
419 | } | |
420 | while (n-- > ctx->tree_count) { | |
421 | audit_put_chunk(q->c[n]); | |
422 | q->c[n] = NULL; | |
423 | } | |
424 | ctx->trees = p; | |
425 | ctx->tree_count = count; | |
426 | #endif | |
427 | } | |
428 | ||
429 | static void free_tree_refs(struct audit_context *ctx) | |
430 | { | |
431 | struct audit_tree_refs *p, *q; | |
432 | for (p = ctx->first_trees; p; p = q) { | |
433 | q = p->next; | |
434 | kfree(p); | |
435 | } | |
436 | } | |
437 | ||
438 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
439 | { | |
440 | #ifdef CONFIG_AUDIT_TREE | |
441 | struct audit_tree_refs *p; | |
442 | int n; | |
443 | if (!tree) | |
444 | return 0; | |
445 | /* full ones */ | |
446 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
447 | for (n = 0; n < 31; n++) | |
448 | if (audit_tree_match(p->c[n], tree)) | |
449 | return 1; | |
450 | } | |
451 | /* partial */ | |
452 | if (p) { | |
453 | for (n = ctx->tree_count; n < 31; n++) | |
454 | if (audit_tree_match(p->c[n], tree)) | |
455 | return 1; | |
456 | } | |
457 | #endif | |
458 | return 0; | |
459 | } | |
460 | ||
f368c07d | 461 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 | 462 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
f5629883 TJ |
463 | * otherwise. |
464 | * | |
465 | * If task_creation is true, this is an explicit indication that we are | |
466 | * filtering a task rule at task creation time. This and tsk == current are | |
467 | * the only situations where tsk->cred may be accessed without an rcu read lock. | |
468 | */ | |
1da177e4 | 469 | static int audit_filter_rules(struct task_struct *tsk, |
93315ed6 | 470 | struct audit_krule *rule, |
1da177e4 | 471 | struct audit_context *ctx, |
f368c07d | 472 | struct audit_names *name, |
f5629883 TJ |
473 | enum audit_state *state, |
474 | bool task_creation) | |
1da177e4 | 475 | { |
f5629883 | 476 | const struct cred *cred; |
5195d8e2 | 477 | int i, need_sid = 1; |
3dc7e315 DG |
478 | u32 sid; |
479 | ||
f5629883 TJ |
480 | cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); |
481 | ||
1da177e4 | 482 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 483 | struct audit_field *f = &rule->fields[i]; |
5195d8e2 | 484 | struct audit_names *n; |
1da177e4 LT |
485 | int result = 0; |
486 | ||
93315ed6 | 487 | switch (f->type) { |
1da177e4 | 488 | case AUDIT_PID: |
93315ed6 | 489 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 490 | break; |
3c66251e | 491 | case AUDIT_PPID: |
419c58f1 AV |
492 | if (ctx) { |
493 | if (!ctx->ppid) | |
494 | ctx->ppid = sys_getppid(); | |
3c66251e | 495 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 496 | } |
3c66251e | 497 | break; |
1da177e4 | 498 | case AUDIT_UID: |
b6dff3ec | 499 | result = audit_comparator(cred->uid, f->op, f->val); |
1da177e4 LT |
500 | break; |
501 | case AUDIT_EUID: | |
b6dff3ec | 502 | result = audit_comparator(cred->euid, f->op, f->val); |
1da177e4 LT |
503 | break; |
504 | case AUDIT_SUID: | |
b6dff3ec | 505 | result = audit_comparator(cred->suid, f->op, f->val); |
1da177e4 LT |
506 | break; |
507 | case AUDIT_FSUID: | |
b6dff3ec | 508 | result = audit_comparator(cred->fsuid, f->op, f->val); |
1da177e4 LT |
509 | break; |
510 | case AUDIT_GID: | |
b6dff3ec | 511 | result = audit_comparator(cred->gid, f->op, f->val); |
1da177e4 LT |
512 | break; |
513 | case AUDIT_EGID: | |
b6dff3ec | 514 | result = audit_comparator(cred->egid, f->op, f->val); |
1da177e4 LT |
515 | break; |
516 | case AUDIT_SGID: | |
b6dff3ec | 517 | result = audit_comparator(cred->sgid, f->op, f->val); |
1da177e4 LT |
518 | break; |
519 | case AUDIT_FSGID: | |
b6dff3ec | 520 | result = audit_comparator(cred->fsgid, f->op, f->val); |
1da177e4 LT |
521 | break; |
522 | case AUDIT_PERS: | |
93315ed6 | 523 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 524 | break; |
2fd6f58b | 525 | case AUDIT_ARCH: |
9f8dbe9c | 526 | if (ctx) |
93315ed6 | 527 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 528 | break; |
1da177e4 LT |
529 | |
530 | case AUDIT_EXIT: | |
531 | if (ctx && ctx->return_valid) | |
93315ed6 | 532 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
533 | break; |
534 | case AUDIT_SUCCESS: | |
b01f2cc1 | 535 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
536 | if (f->val) |
537 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 538 | else |
93315ed6 | 539 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 540 | } |
1da177e4 LT |
541 | break; |
542 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
543 | if (name) |
544 | result = audit_comparator(MAJOR(name->dev), | |
545 | f->op, f->val); | |
546 | else if (ctx) { | |
5195d8e2 EP |
547 | list_for_each_entry(n, &ctx->names_list, list) { |
548 | if (audit_comparator(MAJOR(n->dev), f->op, f->val)) { | |
1da177e4 LT |
549 | ++result; |
550 | break; | |
551 | } | |
552 | } | |
553 | } | |
554 | break; | |
555 | case AUDIT_DEVMINOR: | |
f368c07d AG |
556 | if (name) |
557 | result = audit_comparator(MINOR(name->dev), | |
558 | f->op, f->val); | |
559 | else if (ctx) { | |
5195d8e2 EP |
560 | list_for_each_entry(n, &ctx->names_list, list) { |
561 | if (audit_comparator(MINOR(n->dev), f->op, f->val)) { | |
1da177e4 LT |
562 | ++result; |
563 | break; | |
564 | } | |
565 | } | |
566 | } | |
567 | break; | |
568 | case AUDIT_INODE: | |
f368c07d | 569 | if (name) |
9c937dcc | 570 | result = (name->ino == f->val); |
f368c07d | 571 | else if (ctx) { |
5195d8e2 EP |
572 | list_for_each_entry(n, &ctx->names_list, list) { |
573 | if (audit_comparator(n->ino, f->op, f->val)) { | |
1da177e4 LT |
574 | ++result; |
575 | break; | |
576 | } | |
577 | } | |
578 | } | |
579 | break; | |
f368c07d | 580 | case AUDIT_WATCH: |
ae7b8f41 EP |
581 | if (name) |
582 | result = audit_watch_compare(rule->watch, name->ino, name->dev); | |
f368c07d | 583 | break; |
74c3cbe3 AV |
584 | case AUDIT_DIR: |
585 | if (ctx) | |
586 | result = match_tree_refs(ctx, rule->tree); | |
587 | break; | |
1da177e4 LT |
588 | case AUDIT_LOGINUID: |
589 | result = 0; | |
590 | if (ctx) | |
bfef93a5 | 591 | result = audit_comparator(tsk->loginuid, f->op, f->val); |
1da177e4 | 592 | break; |
3a6b9f85 DG |
593 | case AUDIT_SUBJ_USER: |
594 | case AUDIT_SUBJ_ROLE: | |
595 | case AUDIT_SUBJ_TYPE: | |
596 | case AUDIT_SUBJ_SEN: | |
597 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
598 | /* NOTE: this may return negative values indicating |
599 | a temporary error. We simply treat this as a | |
600 | match for now to avoid losing information that | |
601 | may be wanted. An error message will also be | |
602 | logged upon error */ | |
04305e4a | 603 | if (f->lsm_rule) { |
2ad312d2 | 604 | if (need_sid) { |
2a862b32 | 605 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
606 | need_sid = 0; |
607 | } | |
d7a96f3a | 608 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 609 | f->op, |
04305e4a | 610 | f->lsm_rule, |
3dc7e315 | 611 | ctx); |
2ad312d2 | 612 | } |
3dc7e315 | 613 | break; |
6e5a2d1d DG |
614 | case AUDIT_OBJ_USER: |
615 | case AUDIT_OBJ_ROLE: | |
616 | case AUDIT_OBJ_TYPE: | |
617 | case AUDIT_OBJ_LEV_LOW: | |
618 | case AUDIT_OBJ_LEV_HIGH: | |
619 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
620 | also applies here */ | |
04305e4a | 621 | if (f->lsm_rule) { |
6e5a2d1d DG |
622 | /* Find files that match */ |
623 | if (name) { | |
d7a96f3a | 624 | result = security_audit_rule_match( |
6e5a2d1d | 625 | name->osid, f->type, f->op, |
04305e4a | 626 | f->lsm_rule, ctx); |
6e5a2d1d | 627 | } else if (ctx) { |
5195d8e2 EP |
628 | list_for_each_entry(n, &ctx->names_list, list) { |
629 | if (security_audit_rule_match(n->osid, f->type, | |
630 | f->op, f->lsm_rule, | |
631 | ctx)) { | |
6e5a2d1d DG |
632 | ++result; |
633 | break; | |
634 | } | |
635 | } | |
636 | } | |
637 | /* Find ipc objects that match */ | |
a33e6751 AV |
638 | if (!ctx || ctx->type != AUDIT_IPC) |
639 | break; | |
640 | if (security_audit_rule_match(ctx->ipc.osid, | |
641 | f->type, f->op, | |
642 | f->lsm_rule, ctx)) | |
643 | ++result; | |
6e5a2d1d DG |
644 | } |
645 | break; | |
1da177e4 LT |
646 | case AUDIT_ARG0: |
647 | case AUDIT_ARG1: | |
648 | case AUDIT_ARG2: | |
649 | case AUDIT_ARG3: | |
650 | if (ctx) | |
93315ed6 | 651 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 652 | break; |
5adc8a6a AG |
653 | case AUDIT_FILTERKEY: |
654 | /* ignore this field for filtering */ | |
655 | result = 1; | |
656 | break; | |
55669bfa AV |
657 | case AUDIT_PERM: |
658 | result = audit_match_perm(ctx, f->val); | |
659 | break; | |
8b67dca9 AV |
660 | case AUDIT_FILETYPE: |
661 | result = audit_match_filetype(ctx, f->val); | |
662 | break; | |
1da177e4 LT |
663 | } |
664 | ||
f5629883 | 665 | if (!result) |
1da177e4 LT |
666 | return 0; |
667 | } | |
0590b933 AV |
668 | |
669 | if (ctx) { | |
670 | if (rule->prio <= ctx->prio) | |
671 | return 0; | |
672 | if (rule->filterkey) { | |
673 | kfree(ctx->filterkey); | |
674 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
675 | } | |
676 | ctx->prio = rule->prio; | |
677 | } | |
1da177e4 LT |
678 | switch (rule->action) { |
679 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
680 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
681 | } | |
682 | return 1; | |
683 | } | |
684 | ||
685 | /* At process creation time, we can determine if system-call auditing is | |
686 | * completely disabled for this task. Since we only have the task | |
687 | * structure at this point, we can only check uid and gid. | |
688 | */ | |
e048e02c | 689 | static enum audit_state audit_filter_task(struct task_struct *tsk, char **key) |
1da177e4 LT |
690 | { |
691 | struct audit_entry *e; | |
692 | enum audit_state state; | |
693 | ||
694 | rcu_read_lock(); | |
0f45aa18 | 695 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f5629883 TJ |
696 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, |
697 | &state, true)) { | |
e048e02c AV |
698 | if (state == AUDIT_RECORD_CONTEXT) |
699 | *key = kstrdup(e->rule.filterkey, GFP_ATOMIC); | |
1da177e4 LT |
700 | rcu_read_unlock(); |
701 | return state; | |
702 | } | |
703 | } | |
704 | rcu_read_unlock(); | |
705 | return AUDIT_BUILD_CONTEXT; | |
706 | } | |
707 | ||
708 | /* At syscall entry and exit time, this filter is called if the | |
709 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 710 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 711 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
712 | */ |
713 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
714 | struct audit_context *ctx, | |
715 | struct list_head *list) | |
716 | { | |
717 | struct audit_entry *e; | |
c3896495 | 718 | enum audit_state state; |
1da177e4 | 719 | |
351bb722 | 720 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
721 | return AUDIT_DISABLED; |
722 | ||
1da177e4 | 723 | rcu_read_lock(); |
c3896495 | 724 | if (!list_empty(list)) { |
b63862f4 DK |
725 | int word = AUDIT_WORD(ctx->major); |
726 | int bit = AUDIT_BIT(ctx->major); | |
727 | ||
728 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
729 | if ((e->rule.mask[word] & bit) == bit && |
730 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
f5629883 | 731 | &state, false)) { |
f368c07d | 732 | rcu_read_unlock(); |
0590b933 | 733 | ctx->current_state = state; |
f368c07d AG |
734 | return state; |
735 | } | |
736 | } | |
737 | } | |
738 | rcu_read_unlock(); | |
739 | return AUDIT_BUILD_CONTEXT; | |
740 | } | |
741 | ||
5195d8e2 EP |
742 | /* |
743 | * Given an audit_name check the inode hash table to see if they match. | |
744 | * Called holding the rcu read lock to protect the use of audit_inode_hash | |
745 | */ | |
746 | static int audit_filter_inode_name(struct task_struct *tsk, | |
747 | struct audit_names *n, | |
748 | struct audit_context *ctx) { | |
749 | int word, bit; | |
750 | int h = audit_hash_ino((u32)n->ino); | |
751 | struct list_head *list = &audit_inode_hash[h]; | |
752 | struct audit_entry *e; | |
753 | enum audit_state state; | |
754 | ||
755 | word = AUDIT_WORD(ctx->major); | |
756 | bit = AUDIT_BIT(ctx->major); | |
757 | ||
758 | if (list_empty(list)) | |
759 | return 0; | |
760 | ||
761 | list_for_each_entry_rcu(e, list, list) { | |
762 | if ((e->rule.mask[word] & bit) == bit && | |
763 | audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) { | |
764 | ctx->current_state = state; | |
765 | return 1; | |
766 | } | |
767 | } | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | /* At syscall exit time, this filter is called if any audit_names have been | |
f368c07d | 773 | * collected during syscall processing. We only check rules in sublists at hash |
5195d8e2 | 774 | * buckets applicable to the inode numbers in audit_names. |
f368c07d AG |
775 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). |
776 | */ | |
0590b933 | 777 | void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx) |
f368c07d | 778 | { |
5195d8e2 | 779 | struct audit_names *n; |
f368c07d AG |
780 | |
781 | if (audit_pid && tsk->tgid == audit_pid) | |
0590b933 | 782 | return; |
f368c07d AG |
783 | |
784 | rcu_read_lock(); | |
f368c07d | 785 | |
5195d8e2 EP |
786 | list_for_each_entry(n, &ctx->names_list, list) { |
787 | if (audit_filter_inode_name(tsk, n, ctx)) | |
788 | break; | |
0f45aa18 DW |
789 | } |
790 | rcu_read_unlock(); | |
0f45aa18 DW |
791 | } |
792 | ||
1da177e4 LT |
793 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
794 | int return_valid, | |
6d208da8 | 795 | long return_code) |
1da177e4 LT |
796 | { |
797 | struct audit_context *context = tsk->audit_context; | |
798 | ||
799 | if (likely(!context)) | |
800 | return NULL; | |
801 | context->return_valid = return_valid; | |
f701b75e EP |
802 | |
803 | /* | |
804 | * we need to fix up the return code in the audit logs if the actual | |
805 | * return codes are later going to be fixed up by the arch specific | |
806 | * signal handlers | |
807 | * | |
808 | * This is actually a test for: | |
809 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
810 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
811 | * | |
812 | * but is faster than a bunch of || | |
813 | */ | |
814 | if (unlikely(return_code <= -ERESTARTSYS) && | |
815 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
816 | (return_code != -ENOIOCTLCMD)) | |
817 | context->return_code = -EINTR; | |
818 | else | |
819 | context->return_code = return_code; | |
1da177e4 | 820 | |
0590b933 AV |
821 | if (context->in_syscall && !context->dummy) { |
822 | audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); | |
823 | audit_filter_inodes(tsk, context); | |
1da177e4 LT |
824 | } |
825 | ||
1da177e4 LT |
826 | tsk->audit_context = NULL; |
827 | return context; | |
828 | } | |
829 | ||
830 | static inline void audit_free_names(struct audit_context *context) | |
831 | { | |
5195d8e2 | 832 | struct audit_names *n, *next; |
1da177e4 LT |
833 | |
834 | #if AUDIT_DEBUG == 2 | |
0590b933 | 835 | if (context->put_count + context->ino_count != context->name_count) { |
73241ccc | 836 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
837 | " name_count=%d put_count=%d" |
838 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 839 | __FILE__, __LINE__, |
1da177e4 LT |
840 | context->serial, context->major, context->in_syscall, |
841 | context->name_count, context->put_count, | |
842 | context->ino_count); | |
5195d8e2 | 843 | list_for_each_entry(n, &context->names_list, list) { |
1da177e4 | 844 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
5195d8e2 | 845 | n->name, n->name ?: "(null)"); |
8c8570fb | 846 | } |
1da177e4 LT |
847 | dump_stack(); |
848 | return; | |
849 | } | |
850 | #endif | |
851 | #if AUDIT_DEBUG | |
852 | context->put_count = 0; | |
853 | context->ino_count = 0; | |
854 | #endif | |
855 | ||
5195d8e2 EP |
856 | list_for_each_entry_safe(n, next, &context->names_list, list) { |
857 | list_del(&n->list); | |
858 | if (n->name && n->name_put) | |
859 | __putname(n->name); | |
860 | if (n->should_free) | |
861 | kfree(n); | |
8c8570fb | 862 | } |
1da177e4 | 863 | context->name_count = 0; |
44707fdf JB |
864 | path_put(&context->pwd); |
865 | context->pwd.dentry = NULL; | |
866 | context->pwd.mnt = NULL; | |
1da177e4 LT |
867 | } |
868 | ||
869 | static inline void audit_free_aux(struct audit_context *context) | |
870 | { | |
871 | struct audit_aux_data *aux; | |
872 | ||
873 | while ((aux = context->aux)) { | |
874 | context->aux = aux->next; | |
875 | kfree(aux); | |
876 | } | |
e54dc243 AG |
877 | while ((aux = context->aux_pids)) { |
878 | context->aux_pids = aux->next; | |
879 | kfree(aux); | |
880 | } | |
1da177e4 LT |
881 | } |
882 | ||
883 | static inline void audit_zero_context(struct audit_context *context, | |
884 | enum audit_state state) | |
885 | { | |
1da177e4 LT |
886 | memset(context, 0, sizeof(*context)); |
887 | context->state = state; | |
0590b933 | 888 | context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
1da177e4 LT |
889 | } |
890 | ||
891 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
892 | { | |
893 | struct audit_context *context; | |
894 | ||
895 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
896 | return NULL; | |
897 | audit_zero_context(context, state); | |
916d7576 | 898 | INIT_LIST_HEAD(&context->killed_trees); |
5195d8e2 | 899 | INIT_LIST_HEAD(&context->names_list); |
1da177e4 LT |
900 | return context; |
901 | } | |
902 | ||
b0dd25a8 RD |
903 | /** |
904 | * audit_alloc - allocate an audit context block for a task | |
905 | * @tsk: task | |
906 | * | |
907 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
908 | * if necessary. Doing so turns on system call auditing for the |
909 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
910 | * needed. |
911 | */ | |
1da177e4 LT |
912 | int audit_alloc(struct task_struct *tsk) |
913 | { | |
914 | struct audit_context *context; | |
915 | enum audit_state state; | |
e048e02c | 916 | char *key = NULL; |
1da177e4 | 917 | |
b593d384 | 918 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
919 | return 0; /* Return if not auditing. */ |
920 | ||
e048e02c | 921 | state = audit_filter_task(tsk, &key); |
1da177e4 LT |
922 | if (likely(state == AUDIT_DISABLED)) |
923 | return 0; | |
924 | ||
925 | if (!(context = audit_alloc_context(state))) { | |
e048e02c | 926 | kfree(key); |
1da177e4 LT |
927 | audit_log_lost("out of memory in audit_alloc"); |
928 | return -ENOMEM; | |
929 | } | |
e048e02c | 930 | context->filterkey = key; |
1da177e4 | 931 | |
1da177e4 LT |
932 | tsk->audit_context = context; |
933 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
934 | return 0; | |
935 | } | |
936 | ||
937 | static inline void audit_free_context(struct audit_context *context) | |
938 | { | |
939 | struct audit_context *previous; | |
940 | int count = 0; | |
941 | ||
942 | do { | |
943 | previous = context->previous; | |
944 | if (previous || (count && count < 10)) { | |
945 | ++count; | |
946 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
947 | " freeing multiple contexts (%d)\n", | |
948 | context->serial, context->major, | |
949 | context->name_count, count); | |
950 | } | |
951 | audit_free_names(context); | |
74c3cbe3 AV |
952 | unroll_tree_refs(context, NULL, 0); |
953 | free_tree_refs(context); | |
1da177e4 | 954 | audit_free_aux(context); |
5adc8a6a | 955 | kfree(context->filterkey); |
4f6b434f | 956 | kfree(context->sockaddr); |
1da177e4 LT |
957 | kfree(context); |
958 | context = previous; | |
959 | } while (context); | |
960 | if (count >= 10) | |
961 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
962 | } | |
963 | ||
161a09e7 | 964 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
965 | { |
966 | char *ctx = NULL; | |
c4823bce AV |
967 | unsigned len; |
968 | int error; | |
969 | u32 sid; | |
970 | ||
2a862b32 | 971 | security_task_getsecid(current, &sid); |
c4823bce AV |
972 | if (!sid) |
973 | return; | |
8c8570fb | 974 | |
2a862b32 | 975 | error = security_secid_to_secctx(sid, &ctx, &len); |
c4823bce AV |
976 | if (error) { |
977 | if (error != -EINVAL) | |
8c8570fb DK |
978 | goto error_path; |
979 | return; | |
980 | } | |
981 | ||
8c8570fb | 982 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 | 983 | security_release_secctx(ctx, len); |
7306a0b9 | 984 | return; |
8c8570fb DK |
985 | |
986 | error_path: | |
7306a0b9 | 987 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
988 | return; |
989 | } | |
990 | ||
161a09e7 JL |
991 | EXPORT_SYMBOL(audit_log_task_context); |
992 | ||
e495149b | 993 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 994 | { |
45d9bb0e AV |
995 | char name[sizeof(tsk->comm)]; |
996 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
997 | struct vm_area_struct *vma; |
998 | ||
e495149b AV |
999 | /* tsk == current */ |
1000 | ||
45d9bb0e | 1001 | get_task_comm(name, tsk); |
99e45eea DW |
1002 | audit_log_format(ab, " comm="); |
1003 | audit_log_untrustedstring(ab, name); | |
219f0817 | 1004 | |
e495149b AV |
1005 | if (mm) { |
1006 | down_read(&mm->mmap_sem); | |
1007 | vma = mm->mmap; | |
1008 | while (vma) { | |
1009 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
1010 | vma->vm_file) { | |
1011 | audit_log_d_path(ab, "exe=", | |
44707fdf | 1012 | &vma->vm_file->f_path); |
e495149b AV |
1013 | break; |
1014 | } | |
1015 | vma = vma->vm_next; | |
219f0817 | 1016 | } |
e495149b | 1017 | up_read(&mm->mmap_sem); |
219f0817 | 1018 | } |
e495149b | 1019 | audit_log_task_context(ab); |
219f0817 SS |
1020 | } |
1021 | ||
e54dc243 | 1022 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
4746ec5b EP |
1023 | uid_t auid, uid_t uid, unsigned int sessionid, |
1024 | u32 sid, char *comm) | |
e54dc243 AG |
1025 | { |
1026 | struct audit_buffer *ab; | |
2a862b32 | 1027 | char *ctx = NULL; |
e54dc243 AG |
1028 | u32 len; |
1029 | int rc = 0; | |
1030 | ||
1031 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
1032 | if (!ab) | |
6246ccab | 1033 | return rc; |
e54dc243 | 1034 | |
4746ec5b EP |
1035 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid, |
1036 | uid, sessionid); | |
2a862b32 | 1037 | if (security_secid_to_secctx(sid, &ctx, &len)) { |
c2a7780e | 1038 | audit_log_format(ab, " obj=(none)"); |
e54dc243 | 1039 | rc = 1; |
2a862b32 AD |
1040 | } else { |
1041 | audit_log_format(ab, " obj=%s", ctx); | |
1042 | security_release_secctx(ctx, len); | |
1043 | } | |
c2a7780e EP |
1044 | audit_log_format(ab, " ocomm="); |
1045 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1046 | audit_log_end(ab); |
e54dc243 AG |
1047 | |
1048 | return rc; | |
1049 | } | |
1050 | ||
de6bbd1d EP |
1051 | /* |
1052 | * to_send and len_sent accounting are very loose estimates. We aren't | |
1053 | * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being | |
25985edc | 1054 | * within about 500 bytes (next page boundary) |
de6bbd1d EP |
1055 | * |
1056 | * why snprintf? an int is up to 12 digits long. if we just assumed when | |
1057 | * logging that a[%d]= was going to be 16 characters long we would be wasting | |
1058 | * space in every audit message. In one 7500 byte message we can log up to | |
1059 | * about 1000 min size arguments. That comes down to about 50% waste of space | |
1060 | * if we didn't do the snprintf to find out how long arg_num_len was. | |
1061 | */ | |
1062 | static int audit_log_single_execve_arg(struct audit_context *context, | |
1063 | struct audit_buffer **ab, | |
1064 | int arg_num, | |
1065 | size_t *len_sent, | |
1066 | const char __user *p, | |
1067 | char *buf) | |
bdf4c48a | 1068 | { |
de6bbd1d EP |
1069 | char arg_num_len_buf[12]; |
1070 | const char __user *tmp_p = p; | |
b87ce6e4 EP |
1071 | /* how many digits are in arg_num? 5 is the length of ' a=""' */ |
1072 | size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5; | |
de6bbd1d EP |
1073 | size_t len, len_left, to_send; |
1074 | size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; | |
1075 | unsigned int i, has_cntl = 0, too_long = 0; | |
1076 | int ret; | |
1077 | ||
1078 | /* strnlen_user includes the null we don't want to send */ | |
1079 | len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
bdf4c48a | 1080 | |
de6bbd1d EP |
1081 | /* |
1082 | * We just created this mm, if we can't find the strings | |
1083 | * we just copied into it something is _very_ wrong. Similar | |
1084 | * for strings that are too long, we should not have created | |
1085 | * any. | |
1086 | */ | |
b0abcfc1 | 1087 | if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) { |
de6bbd1d EP |
1088 | WARN_ON(1); |
1089 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1090 | return -1; |
de6bbd1d | 1091 | } |
040b3a2d | 1092 | |
de6bbd1d EP |
1093 | /* walk the whole argument looking for non-ascii chars */ |
1094 | do { | |
1095 | if (len_left > MAX_EXECVE_AUDIT_LEN) | |
1096 | to_send = MAX_EXECVE_AUDIT_LEN; | |
1097 | else | |
1098 | to_send = len_left; | |
1099 | ret = copy_from_user(buf, tmp_p, to_send); | |
bdf4c48a | 1100 | /* |
de6bbd1d EP |
1101 | * There is no reason for this copy to be short. We just |
1102 | * copied them here, and the mm hasn't been exposed to user- | |
1103 | * space yet. | |
bdf4c48a | 1104 | */ |
de6bbd1d | 1105 | if (ret) { |
bdf4c48a PZ |
1106 | WARN_ON(1); |
1107 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1108 | return -1; |
bdf4c48a | 1109 | } |
de6bbd1d EP |
1110 | buf[to_send] = '\0'; |
1111 | has_cntl = audit_string_contains_control(buf, to_send); | |
1112 | if (has_cntl) { | |
1113 | /* | |
1114 | * hex messages get logged as 2 bytes, so we can only | |
1115 | * send half as much in each message | |
1116 | */ | |
1117 | max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2; | |
bdf4c48a PZ |
1118 | break; |
1119 | } | |
de6bbd1d EP |
1120 | len_left -= to_send; |
1121 | tmp_p += to_send; | |
1122 | } while (len_left > 0); | |
1123 | ||
1124 | len_left = len; | |
1125 | ||
1126 | if (len > max_execve_audit_len) | |
1127 | too_long = 1; | |
1128 | ||
1129 | /* rewalk the argument actually logging the message */ | |
1130 | for (i = 0; len_left > 0; i++) { | |
1131 | int room_left; | |
1132 | ||
1133 | if (len_left > max_execve_audit_len) | |
1134 | to_send = max_execve_audit_len; | |
1135 | else | |
1136 | to_send = len_left; | |
1137 | ||
1138 | /* do we have space left to send this argument in this ab? */ | |
1139 | room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent; | |
1140 | if (has_cntl) | |
1141 | room_left -= (to_send * 2); | |
1142 | else | |
1143 | room_left -= to_send; | |
1144 | if (room_left < 0) { | |
1145 | *len_sent = 0; | |
1146 | audit_log_end(*ab); | |
1147 | *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE); | |
1148 | if (!*ab) | |
1149 | return 0; | |
1150 | } | |
bdf4c48a | 1151 | |
bdf4c48a | 1152 | /* |
de6bbd1d EP |
1153 | * first record needs to say how long the original string was |
1154 | * so we can be sure nothing was lost. | |
1155 | */ | |
1156 | if ((i == 0) && (too_long)) | |
ca96a895 | 1157 | audit_log_format(*ab, " a%d_len=%zu", arg_num, |
de6bbd1d EP |
1158 | has_cntl ? 2*len : len); |
1159 | ||
1160 | /* | |
1161 | * normally arguments are small enough to fit and we already | |
1162 | * filled buf above when we checked for control characters | |
1163 | * so don't bother with another copy_from_user | |
bdf4c48a | 1164 | */ |
de6bbd1d EP |
1165 | if (len >= max_execve_audit_len) |
1166 | ret = copy_from_user(buf, p, to_send); | |
1167 | else | |
1168 | ret = 0; | |
040b3a2d | 1169 | if (ret) { |
bdf4c48a PZ |
1170 | WARN_ON(1); |
1171 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1172 | return -1; |
bdf4c48a | 1173 | } |
de6bbd1d EP |
1174 | buf[to_send] = '\0'; |
1175 | ||
1176 | /* actually log it */ | |
ca96a895 | 1177 | audit_log_format(*ab, " a%d", arg_num); |
de6bbd1d EP |
1178 | if (too_long) |
1179 | audit_log_format(*ab, "[%d]", i); | |
1180 | audit_log_format(*ab, "="); | |
1181 | if (has_cntl) | |
b556f8ad | 1182 | audit_log_n_hex(*ab, buf, to_send); |
de6bbd1d | 1183 | else |
9d960985 | 1184 | audit_log_string(*ab, buf); |
de6bbd1d EP |
1185 | |
1186 | p += to_send; | |
1187 | len_left -= to_send; | |
1188 | *len_sent += arg_num_len; | |
1189 | if (has_cntl) | |
1190 | *len_sent += to_send * 2; | |
1191 | else | |
1192 | *len_sent += to_send; | |
1193 | } | |
1194 | /* include the null we didn't log */ | |
1195 | return len + 1; | |
1196 | } | |
1197 | ||
1198 | static void audit_log_execve_info(struct audit_context *context, | |
1199 | struct audit_buffer **ab, | |
1200 | struct audit_aux_data_execve *axi) | |
1201 | { | |
1202 | int i; | |
1203 | size_t len, len_sent = 0; | |
1204 | const char __user *p; | |
1205 | char *buf; | |
bdf4c48a | 1206 | |
de6bbd1d EP |
1207 | if (axi->mm != current->mm) |
1208 | return; /* execve failed, no additional info */ | |
1209 | ||
1210 | p = (const char __user *)axi->mm->arg_start; | |
bdf4c48a | 1211 | |
ca96a895 | 1212 | audit_log_format(*ab, "argc=%d", axi->argc); |
de6bbd1d EP |
1213 | |
1214 | /* | |
1215 | * we need some kernel buffer to hold the userspace args. Just | |
1216 | * allocate one big one rather than allocating one of the right size | |
1217 | * for every single argument inside audit_log_single_execve_arg() | |
1218 | * should be <8k allocation so should be pretty safe. | |
1219 | */ | |
1220 | buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1221 | if (!buf) { | |
1222 | audit_panic("out of memory for argv string\n"); | |
1223 | return; | |
bdf4c48a | 1224 | } |
de6bbd1d EP |
1225 | |
1226 | for (i = 0; i < axi->argc; i++) { | |
1227 | len = audit_log_single_execve_arg(context, ab, i, | |
1228 | &len_sent, p, buf); | |
1229 | if (len <= 0) | |
1230 | break; | |
1231 | p += len; | |
1232 | } | |
1233 | kfree(buf); | |
bdf4c48a PZ |
1234 | } |
1235 | ||
851f7ff5 EP |
1236 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1237 | { | |
1238 | int i; | |
1239 | ||
1240 | audit_log_format(ab, " %s=", prefix); | |
1241 | CAP_FOR_EACH_U32(i) { | |
1242 | audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1247 | { | |
1248 | kernel_cap_t *perm = &name->fcap.permitted; | |
1249 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1250 | int log = 0; | |
1251 | ||
1252 | if (!cap_isclear(*perm)) { | |
1253 | audit_log_cap(ab, "cap_fp", perm); | |
1254 | log = 1; | |
1255 | } | |
1256 | if (!cap_isclear(*inh)) { | |
1257 | audit_log_cap(ab, "cap_fi", inh); | |
1258 | log = 1; | |
1259 | } | |
1260 | ||
1261 | if (log) | |
1262 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); | |
1263 | } | |
1264 | ||
a33e6751 | 1265 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1266 | { |
1267 | struct audit_buffer *ab; | |
1268 | int i; | |
1269 | ||
1270 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1271 | if (!ab) | |
1272 | return; | |
1273 | ||
1274 | switch (context->type) { | |
1275 | case AUDIT_SOCKETCALL: { | |
1276 | int nargs = context->socketcall.nargs; | |
1277 | audit_log_format(ab, "nargs=%d", nargs); | |
1278 | for (i = 0; i < nargs; i++) | |
1279 | audit_log_format(ab, " a%d=%lx", i, | |
1280 | context->socketcall.args[i]); | |
1281 | break; } | |
a33e6751 AV |
1282 | case AUDIT_IPC: { |
1283 | u32 osid = context->ipc.osid; | |
1284 | ||
2570ebbd | 1285 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho", |
a33e6751 AV |
1286 | context->ipc.uid, context->ipc.gid, context->ipc.mode); |
1287 | if (osid) { | |
1288 | char *ctx = NULL; | |
1289 | u32 len; | |
1290 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1291 | audit_log_format(ab, " osid=%u", osid); | |
1292 | *call_panic = 1; | |
1293 | } else { | |
1294 | audit_log_format(ab, " obj=%s", ctx); | |
1295 | security_release_secctx(ctx, len); | |
1296 | } | |
1297 | } | |
e816f370 AV |
1298 | if (context->ipc.has_perm) { |
1299 | audit_log_end(ab); | |
1300 | ab = audit_log_start(context, GFP_KERNEL, | |
1301 | AUDIT_IPC_SET_PERM); | |
1302 | audit_log_format(ab, | |
2570ebbd | 1303 | "qbytes=%lx ouid=%u ogid=%u mode=%#ho", |
e816f370 AV |
1304 | context->ipc.qbytes, |
1305 | context->ipc.perm_uid, | |
1306 | context->ipc.perm_gid, | |
1307 | context->ipc.perm_mode); | |
1308 | if (!ab) | |
1309 | return; | |
1310 | } | |
a33e6751 | 1311 | break; } |
564f6993 AV |
1312 | case AUDIT_MQ_OPEN: { |
1313 | audit_log_format(ab, | |
df0a4283 | 1314 | "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld " |
564f6993 AV |
1315 | "mq_msgsize=%ld mq_curmsgs=%ld", |
1316 | context->mq_open.oflag, context->mq_open.mode, | |
1317 | context->mq_open.attr.mq_flags, | |
1318 | context->mq_open.attr.mq_maxmsg, | |
1319 | context->mq_open.attr.mq_msgsize, | |
1320 | context->mq_open.attr.mq_curmsgs); | |
1321 | break; } | |
c32c8af4 AV |
1322 | case AUDIT_MQ_SENDRECV: { |
1323 | audit_log_format(ab, | |
1324 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
1325 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
1326 | context->mq_sendrecv.mqdes, | |
1327 | context->mq_sendrecv.msg_len, | |
1328 | context->mq_sendrecv.msg_prio, | |
1329 | context->mq_sendrecv.abs_timeout.tv_sec, | |
1330 | context->mq_sendrecv.abs_timeout.tv_nsec); | |
1331 | break; } | |
20114f71 AV |
1332 | case AUDIT_MQ_NOTIFY: { |
1333 | audit_log_format(ab, "mqdes=%d sigev_signo=%d", | |
1334 | context->mq_notify.mqdes, | |
1335 | context->mq_notify.sigev_signo); | |
1336 | break; } | |
7392906e AV |
1337 | case AUDIT_MQ_GETSETATTR: { |
1338 | struct mq_attr *attr = &context->mq_getsetattr.mqstat; | |
1339 | audit_log_format(ab, | |
1340 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1341 | "mq_curmsgs=%ld ", | |
1342 | context->mq_getsetattr.mqdes, | |
1343 | attr->mq_flags, attr->mq_maxmsg, | |
1344 | attr->mq_msgsize, attr->mq_curmsgs); | |
1345 | break; } | |
57f71a0a AV |
1346 | case AUDIT_CAPSET: { |
1347 | audit_log_format(ab, "pid=%d", context->capset.pid); | |
1348 | audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable); | |
1349 | audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted); | |
1350 | audit_log_cap(ab, "cap_pe", &context->capset.cap.effective); | |
1351 | break; } | |
120a795d AV |
1352 | case AUDIT_MMAP: { |
1353 | audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd, | |
1354 | context->mmap.flags); | |
1355 | break; } | |
f3298dc4 AV |
1356 | } |
1357 | audit_log_end(ab); | |
1358 | } | |
1359 | ||
5195d8e2 EP |
1360 | static void audit_log_name(struct audit_context *context, struct audit_names *n, |
1361 | int record_num, int *call_panic) | |
1362 | { | |
1363 | struct audit_buffer *ab; | |
1364 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1365 | if (!ab) | |
1366 | return; /* audit_panic has been called */ | |
1367 | ||
1368 | audit_log_format(ab, "item=%d", record_num); | |
1369 | ||
1370 | if (n->name) { | |
1371 | switch (n->name_len) { | |
1372 | case AUDIT_NAME_FULL: | |
1373 | /* log the full path */ | |
1374 | audit_log_format(ab, " name="); | |
1375 | audit_log_untrustedstring(ab, n->name); | |
1376 | break; | |
1377 | case 0: | |
1378 | /* name was specified as a relative path and the | |
1379 | * directory component is the cwd */ | |
1380 | audit_log_d_path(ab, "name=", &context->pwd); | |
1381 | break; | |
1382 | default: | |
1383 | /* log the name's directory component */ | |
1384 | audit_log_format(ab, " name="); | |
1385 | audit_log_n_untrustedstring(ab, n->name, | |
1386 | n->name_len); | |
1387 | } | |
1388 | } else | |
1389 | audit_log_format(ab, " name=(null)"); | |
1390 | ||
1391 | if (n->ino != (unsigned long)-1) { | |
1392 | audit_log_format(ab, " inode=%lu" | |
1393 | " dev=%02x:%02x mode=%#ho" | |
1394 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1395 | n->ino, | |
1396 | MAJOR(n->dev), | |
1397 | MINOR(n->dev), | |
1398 | n->mode, | |
1399 | n->uid, | |
1400 | n->gid, | |
1401 | MAJOR(n->rdev), | |
1402 | MINOR(n->rdev)); | |
1403 | } | |
1404 | if (n->osid != 0) { | |
1405 | char *ctx = NULL; | |
1406 | u32 len; | |
1407 | if (security_secid_to_secctx( | |
1408 | n->osid, &ctx, &len)) { | |
1409 | audit_log_format(ab, " osid=%u", n->osid); | |
1410 | *call_panic = 2; | |
1411 | } else { | |
1412 | audit_log_format(ab, " obj=%s", ctx); | |
1413 | security_release_secctx(ctx, len); | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | audit_log_fcaps(ab, n); | |
1418 | ||
1419 | audit_log_end(ab); | |
1420 | } | |
1421 | ||
e495149b | 1422 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1423 | { |
c69e8d9c | 1424 | const struct cred *cred; |
9c7aa6aa | 1425 | int i, call_panic = 0; |
1da177e4 | 1426 | struct audit_buffer *ab; |
7551ced3 | 1427 | struct audit_aux_data *aux; |
a6c043a8 | 1428 | const char *tty; |
5195d8e2 | 1429 | struct audit_names *n; |
1da177e4 | 1430 | |
e495149b | 1431 | /* tsk == current */ |
3f2792ff | 1432 | context->pid = tsk->pid; |
419c58f1 AV |
1433 | if (!context->ppid) |
1434 | context->ppid = sys_getppid(); | |
c69e8d9c DH |
1435 | cred = current_cred(); |
1436 | context->uid = cred->uid; | |
1437 | context->gid = cred->gid; | |
1438 | context->euid = cred->euid; | |
1439 | context->suid = cred->suid; | |
b6dff3ec | 1440 | context->fsuid = cred->fsuid; |
c69e8d9c DH |
1441 | context->egid = cred->egid; |
1442 | context->sgid = cred->sgid; | |
b6dff3ec | 1443 | context->fsgid = cred->fsgid; |
3f2792ff | 1444 | context->personality = tsk->personality; |
e495149b AV |
1445 | |
1446 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1447 | if (!ab) |
1448 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1449 | audit_log_format(ab, "arch=%x syscall=%d", |
1450 | context->arch, context->major); | |
1da177e4 LT |
1451 | if (context->personality != PER_LINUX) |
1452 | audit_log_format(ab, " per=%lx", context->personality); | |
1453 | if (context->return_valid) | |
9f8dbe9c | 1454 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b | 1455 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1456 | context->return_code); | |
eb84a20e | 1457 | |
dbda4c0b | 1458 | spin_lock_irq(&tsk->sighand->siglock); |
45d9bb0e AV |
1459 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
1460 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
1461 | else |
1462 | tty = "(none)"; | |
dbda4c0b AC |
1463 | spin_unlock_irq(&tsk->sighand->siglock); |
1464 | ||
1da177e4 LT |
1465 | audit_log_format(ab, |
1466 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 1467 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 1468 | " euid=%u suid=%u fsuid=%u" |
4746ec5b | 1469 | " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
1da177e4 LT |
1470 | context->argv[0], |
1471 | context->argv[1], | |
1472 | context->argv[2], | |
1473 | context->argv[3], | |
1474 | context->name_count, | |
f46038ff | 1475 | context->ppid, |
1da177e4 | 1476 | context->pid, |
bfef93a5 | 1477 | tsk->loginuid, |
1da177e4 LT |
1478 | context->uid, |
1479 | context->gid, | |
1480 | context->euid, context->suid, context->fsuid, | |
4746ec5b EP |
1481 | context->egid, context->sgid, context->fsgid, tty, |
1482 | tsk->sessionid); | |
eb84a20e | 1483 | |
eb84a20e | 1484 | |
e495149b | 1485 | audit_log_task_info(ab, tsk); |
9d960985 | 1486 | audit_log_key(ab, context->filterkey); |
1da177e4 | 1487 | audit_log_end(ab); |
1da177e4 | 1488 | |
7551ced3 | 1489 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1490 | |
e495149b | 1491 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1492 | if (!ab) |
1493 | continue; /* audit_panic has been called */ | |
1494 | ||
1da177e4 | 1495 | switch (aux->type) { |
20ca73bc | 1496 | |
473ae30b AV |
1497 | case AUDIT_EXECVE: { |
1498 | struct audit_aux_data_execve *axi = (void *)aux; | |
de6bbd1d | 1499 | audit_log_execve_info(context, &ab, axi); |
473ae30b | 1500 | break; } |
073115d6 | 1501 | |
3fc689e9 EP |
1502 | case AUDIT_BPRM_FCAPS: { |
1503 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1504 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1505 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1506 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1507 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1508 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1509 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1510 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
1511 | audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted); | |
1512 | audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); | |
1513 | audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); | |
1514 | break; } | |
1515 | ||
1da177e4 LT |
1516 | } |
1517 | audit_log_end(ab); | |
1da177e4 LT |
1518 | } |
1519 | ||
f3298dc4 | 1520 | if (context->type) |
a33e6751 | 1521 | show_special(context, &call_panic); |
f3298dc4 | 1522 | |
157cf649 AV |
1523 | if (context->fds[0] >= 0) { |
1524 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR); | |
1525 | if (ab) { | |
1526 | audit_log_format(ab, "fd0=%d fd1=%d", | |
1527 | context->fds[0], context->fds[1]); | |
1528 | audit_log_end(ab); | |
1529 | } | |
1530 | } | |
1531 | ||
4f6b434f AV |
1532 | if (context->sockaddr_len) { |
1533 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1534 | if (ab) { | |
1535 | audit_log_format(ab, "saddr="); | |
1536 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1537 | context->sockaddr_len); | |
1538 | audit_log_end(ab); | |
1539 | } | |
1540 | } | |
1541 | ||
e54dc243 AG |
1542 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1543 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1544 | |
1545 | for (i = 0; i < axs->pid_count; i++) | |
1546 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1547 | axs->target_auid[i], |
1548 | axs->target_uid[i], | |
4746ec5b | 1549 | axs->target_sessionid[i], |
c2a7780e EP |
1550 | axs->target_sid[i], |
1551 | axs->target_comm[i])) | |
e54dc243 | 1552 | call_panic = 1; |
a5cb013d AV |
1553 | } |
1554 | ||
e54dc243 AG |
1555 | if (context->target_pid && |
1556 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1557 | context->target_auid, context->target_uid, |
4746ec5b | 1558 | context->target_sessionid, |
c2a7780e | 1559 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1560 | call_panic = 1; |
1561 | ||
44707fdf | 1562 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1563 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1564 | if (ab) { |
44707fdf | 1565 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1566 | audit_log_end(ab); |
1567 | } | |
1568 | } | |
73241ccc | 1569 | |
5195d8e2 EP |
1570 | i = 0; |
1571 | list_for_each_entry(n, &context->names_list, list) | |
1572 | audit_log_name(context, n, i++, &call_panic); | |
c0641f28 EP |
1573 | |
1574 | /* Send end of event record to help user space know we are finished */ | |
1575 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1576 | if (ab) | |
1577 | audit_log_end(ab); | |
9c7aa6aa SG |
1578 | if (call_panic) |
1579 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1580 | } |
1581 | ||
b0dd25a8 RD |
1582 | /** |
1583 | * audit_free - free a per-task audit context | |
1584 | * @tsk: task whose audit context block to free | |
1585 | * | |
fa84cb93 | 1586 | * Called from copy_process and do_exit |
b0dd25a8 | 1587 | */ |
1da177e4 LT |
1588 | void audit_free(struct task_struct *tsk) |
1589 | { | |
1590 | struct audit_context *context; | |
1591 | ||
1da177e4 | 1592 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1593 | if (likely(!context)) |
1594 | return; | |
1595 | ||
1596 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1597 | * function (e.g., exit_group), then free context block. |
1598 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1599 | * in the context of the idle thread */ |
e495149b | 1600 | /* that can happen only if we are called from do_exit() */ |
0590b933 | 1601 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1602 | audit_log_exit(context, tsk); |
916d7576 AV |
1603 | if (!list_empty(&context->killed_trees)) |
1604 | audit_kill_trees(&context->killed_trees); | |
1da177e4 LT |
1605 | |
1606 | audit_free_context(context); | |
1607 | } | |
1608 | ||
b0dd25a8 RD |
1609 | /** |
1610 | * audit_syscall_entry - fill in an audit record at syscall entry | |
b0dd25a8 RD |
1611 | * @arch: architecture type |
1612 | * @major: major syscall type (function) | |
1613 | * @a1: additional syscall register 1 | |
1614 | * @a2: additional syscall register 2 | |
1615 | * @a3: additional syscall register 3 | |
1616 | * @a4: additional syscall register 4 | |
1617 | * | |
1618 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1619 | * audit context was created when the task was created and the state or |
1620 | * filters demand the audit context be built. If the state from the | |
1621 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1622 | * then the record will be written at syscall exit time (otherwise, it | |
1623 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1624 | * be written). |
1625 | */ | |
5411be59 | 1626 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1627 | unsigned long a1, unsigned long a2, |
1628 | unsigned long a3, unsigned long a4) | |
1629 | { | |
5411be59 | 1630 | struct task_struct *tsk = current; |
1da177e4 LT |
1631 | struct audit_context *context = tsk->audit_context; |
1632 | enum audit_state state; | |
1633 | ||
86a1c34a RM |
1634 | if (unlikely(!context)) |
1635 | return; | |
1da177e4 | 1636 | |
b0dd25a8 RD |
1637 | /* |
1638 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1639 | * calls in kernel_thread via the entry.S interface, instead of |
1640 | * with direct calls. (If you are porting to a new | |
1641 | * architecture, hitting this condition can indicate that you | |
1642 | * got the _exit/_leave calls backward in entry.S.) | |
1643 | * | |
1644 | * i386 no | |
1645 | * x86_64 no | |
2ef9481e | 1646 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1647 | * |
1648 | * This also happens with vm86 emulation in a non-nested manner | |
1649 | * (entries without exits), so this case must be caught. | |
1650 | */ | |
1651 | if (context->in_syscall) { | |
1652 | struct audit_context *newctx; | |
1653 | ||
1da177e4 LT |
1654 | #if AUDIT_DEBUG |
1655 | printk(KERN_ERR | |
1656 | "audit(:%d) pid=%d in syscall=%d;" | |
1657 | " entering syscall=%d\n", | |
1658 | context->serial, tsk->pid, context->major, major); | |
1659 | #endif | |
1660 | newctx = audit_alloc_context(context->state); | |
1661 | if (newctx) { | |
1662 | newctx->previous = context; | |
1663 | context = newctx; | |
1664 | tsk->audit_context = newctx; | |
1665 | } else { | |
1666 | /* If we can't alloc a new context, the best we | |
1667 | * can do is to leak memory (any pending putname | |
1668 | * will be lost). The only other alternative is | |
1669 | * to abandon auditing. */ | |
1670 | audit_zero_context(context, context->state); | |
1671 | } | |
1672 | } | |
1673 | BUG_ON(context->in_syscall || context->name_count); | |
1674 | ||
1675 | if (!audit_enabled) | |
1676 | return; | |
1677 | ||
2fd6f58b | 1678 | context->arch = arch; |
1da177e4 LT |
1679 | context->major = major; |
1680 | context->argv[0] = a1; | |
1681 | context->argv[1] = a2; | |
1682 | context->argv[2] = a3; | |
1683 | context->argv[3] = a4; | |
1684 | ||
1685 | state = context->state; | |
d51374ad | 1686 | context->dummy = !audit_n_rules; |
0590b933 AV |
1687 | if (!context->dummy && state == AUDIT_BUILD_CONTEXT) { |
1688 | context->prio = 0; | |
0f45aa18 | 1689 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
0590b933 | 1690 | } |
1da177e4 LT |
1691 | if (likely(state == AUDIT_DISABLED)) |
1692 | return; | |
1693 | ||
ce625a80 | 1694 | context->serial = 0; |
1da177e4 LT |
1695 | context->ctime = CURRENT_TIME; |
1696 | context->in_syscall = 1; | |
0590b933 | 1697 | context->current_state = state; |
419c58f1 | 1698 | context->ppid = 0; |
1da177e4 LT |
1699 | } |
1700 | ||
a64e6494 AV |
1701 | void audit_finish_fork(struct task_struct *child) |
1702 | { | |
1703 | struct audit_context *ctx = current->audit_context; | |
1704 | struct audit_context *p = child->audit_context; | |
0590b933 AV |
1705 | if (!p || !ctx) |
1706 | return; | |
1707 | if (!ctx->in_syscall || ctx->current_state != AUDIT_RECORD_CONTEXT) | |
a64e6494 AV |
1708 | return; |
1709 | p->arch = ctx->arch; | |
1710 | p->major = ctx->major; | |
1711 | memcpy(p->argv, ctx->argv, sizeof(ctx->argv)); | |
1712 | p->ctime = ctx->ctime; | |
1713 | p->dummy = ctx->dummy; | |
a64e6494 AV |
1714 | p->in_syscall = ctx->in_syscall; |
1715 | p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL); | |
1716 | p->ppid = current->pid; | |
0590b933 AV |
1717 | p->prio = ctx->prio; |
1718 | p->current_state = ctx->current_state; | |
a64e6494 AV |
1719 | } |
1720 | ||
b0dd25a8 RD |
1721 | /** |
1722 | * audit_syscall_exit - deallocate audit context after a system call | |
b0dd25a8 RD |
1723 | * @valid: success/failure flag |
1724 | * @return_code: syscall return value | |
1725 | * | |
1726 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1727 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1728 | * filtering, or because some other part of the kernel write an audit | |
1729 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1730 | * free the names stored from getname(). |
1731 | */ | |
5411be59 | 1732 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1733 | { |
5411be59 | 1734 | struct task_struct *tsk = current; |
1da177e4 LT |
1735 | struct audit_context *context; |
1736 | ||
2fd6f58b | 1737 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1738 | |
1da177e4 | 1739 | if (likely(!context)) |
97e94c45 | 1740 | return; |
1da177e4 | 1741 | |
0590b933 | 1742 | if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) |
e495149b | 1743 | audit_log_exit(context, tsk); |
1da177e4 LT |
1744 | |
1745 | context->in_syscall = 0; | |
0590b933 | 1746 | context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0; |
2fd6f58b | 1747 | |
916d7576 AV |
1748 | if (!list_empty(&context->killed_trees)) |
1749 | audit_kill_trees(&context->killed_trees); | |
1750 | ||
1da177e4 LT |
1751 | if (context->previous) { |
1752 | struct audit_context *new_context = context->previous; | |
1753 | context->previous = NULL; | |
1754 | audit_free_context(context); | |
1755 | tsk->audit_context = new_context; | |
1756 | } else { | |
1757 | audit_free_names(context); | |
74c3cbe3 | 1758 | unroll_tree_refs(context, NULL, 0); |
1da177e4 | 1759 | audit_free_aux(context); |
e54dc243 AG |
1760 | context->aux = NULL; |
1761 | context->aux_pids = NULL; | |
a5cb013d | 1762 | context->target_pid = 0; |
e54dc243 | 1763 | context->target_sid = 0; |
4f6b434f | 1764 | context->sockaddr_len = 0; |
f3298dc4 | 1765 | context->type = 0; |
157cf649 | 1766 | context->fds[0] = -1; |
e048e02c AV |
1767 | if (context->state != AUDIT_RECORD_CONTEXT) { |
1768 | kfree(context->filterkey); | |
1769 | context->filterkey = NULL; | |
1770 | } | |
1da177e4 LT |
1771 | tsk->audit_context = context; |
1772 | } | |
1da177e4 LT |
1773 | } |
1774 | ||
74c3cbe3 AV |
1775 | static inline void handle_one(const struct inode *inode) |
1776 | { | |
1777 | #ifdef CONFIG_AUDIT_TREE | |
1778 | struct audit_context *context; | |
1779 | struct audit_tree_refs *p; | |
1780 | struct audit_chunk *chunk; | |
1781 | int count; | |
e61ce867 | 1782 | if (likely(hlist_empty(&inode->i_fsnotify_marks))) |
74c3cbe3 AV |
1783 | return; |
1784 | context = current->audit_context; | |
1785 | p = context->trees; | |
1786 | count = context->tree_count; | |
1787 | rcu_read_lock(); | |
1788 | chunk = audit_tree_lookup(inode); | |
1789 | rcu_read_unlock(); | |
1790 | if (!chunk) | |
1791 | return; | |
1792 | if (likely(put_tree_ref(context, chunk))) | |
1793 | return; | |
1794 | if (unlikely(!grow_tree_refs(context))) { | |
436c405c | 1795 | printk(KERN_WARNING "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1796 | audit_set_auditable(context); |
1797 | audit_put_chunk(chunk); | |
1798 | unroll_tree_refs(context, p, count); | |
1799 | return; | |
1800 | } | |
1801 | put_tree_ref(context, chunk); | |
1802 | #endif | |
1803 | } | |
1804 | ||
1805 | static void handle_path(const struct dentry *dentry) | |
1806 | { | |
1807 | #ifdef CONFIG_AUDIT_TREE | |
1808 | struct audit_context *context; | |
1809 | struct audit_tree_refs *p; | |
1810 | const struct dentry *d, *parent; | |
1811 | struct audit_chunk *drop; | |
1812 | unsigned long seq; | |
1813 | int count; | |
1814 | ||
1815 | context = current->audit_context; | |
1816 | p = context->trees; | |
1817 | count = context->tree_count; | |
1818 | retry: | |
1819 | drop = NULL; | |
1820 | d = dentry; | |
1821 | rcu_read_lock(); | |
1822 | seq = read_seqbegin(&rename_lock); | |
1823 | for(;;) { | |
1824 | struct inode *inode = d->d_inode; | |
e61ce867 | 1825 | if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) { |
74c3cbe3 AV |
1826 | struct audit_chunk *chunk; |
1827 | chunk = audit_tree_lookup(inode); | |
1828 | if (chunk) { | |
1829 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1830 | drop = chunk; | |
1831 | break; | |
1832 | } | |
1833 | } | |
1834 | } | |
1835 | parent = d->d_parent; | |
1836 | if (parent == d) | |
1837 | break; | |
1838 | d = parent; | |
1839 | } | |
1840 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1841 | rcu_read_unlock(); | |
1842 | if (!drop) { | |
1843 | /* just a race with rename */ | |
1844 | unroll_tree_refs(context, p, count); | |
1845 | goto retry; | |
1846 | } | |
1847 | audit_put_chunk(drop); | |
1848 | if (grow_tree_refs(context)) { | |
1849 | /* OK, got more space */ | |
1850 | unroll_tree_refs(context, p, count); | |
1851 | goto retry; | |
1852 | } | |
1853 | /* too bad */ | |
1854 | printk(KERN_WARNING | |
436c405c | 1855 | "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1856 | unroll_tree_refs(context, p, count); |
1857 | audit_set_auditable(context); | |
1858 | return; | |
1859 | } | |
1860 | rcu_read_unlock(); | |
1861 | #endif | |
1862 | } | |
1863 | ||
5195d8e2 EP |
1864 | static struct audit_names *audit_alloc_name(struct audit_context *context) |
1865 | { | |
1866 | struct audit_names *aname; | |
1867 | ||
1868 | if (context->name_count < AUDIT_NAMES) { | |
1869 | aname = &context->preallocated_names[context->name_count]; | |
1870 | memset(aname, 0, sizeof(*aname)); | |
1871 | } else { | |
1872 | aname = kzalloc(sizeof(*aname), GFP_NOFS); | |
1873 | if (!aname) | |
1874 | return NULL; | |
1875 | aname->should_free = true; | |
1876 | } | |
1877 | ||
1878 | aname->ino = (unsigned long)-1; | |
1879 | list_add_tail(&aname->list, &context->names_list); | |
1880 | ||
1881 | context->name_count++; | |
1882 | #if AUDIT_DEBUG | |
1883 | context->ino_count++; | |
1884 | #endif | |
1885 | return aname; | |
1886 | } | |
1887 | ||
b0dd25a8 RD |
1888 | /** |
1889 | * audit_getname - add a name to the list | |
1890 | * @name: name to add | |
1891 | * | |
1892 | * Add a name to the list of audit names for this context. | |
1893 | * Called from fs/namei.c:getname(). | |
1894 | */ | |
d8945bb5 | 1895 | void __audit_getname(const char *name) |
1da177e4 LT |
1896 | { |
1897 | struct audit_context *context = current->audit_context; | |
5195d8e2 | 1898 | struct audit_names *n; |
1da177e4 | 1899 | |
d8945bb5 | 1900 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1901 | return; |
1902 | ||
1903 | if (!context->in_syscall) { | |
1904 | #if AUDIT_DEBUG == 2 | |
1905 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1906 | __FILE__, __LINE__, context->serial, name); | |
1907 | dump_stack(); | |
1908 | #endif | |
1909 | return; | |
1910 | } | |
5195d8e2 EP |
1911 | |
1912 | n = audit_alloc_name(context); | |
1913 | if (!n) | |
1914 | return; | |
1915 | ||
1916 | n->name = name; | |
1917 | n->name_len = AUDIT_NAME_FULL; | |
1918 | n->name_put = true; | |
1919 | ||
f7ad3c6b MS |
1920 | if (!context->pwd.dentry) |
1921 | get_fs_pwd(current->fs, &context->pwd); | |
1da177e4 LT |
1922 | } |
1923 | ||
b0dd25a8 RD |
1924 | /* audit_putname - intercept a putname request |
1925 | * @name: name to intercept and delay for putname | |
1926 | * | |
1927 | * If we have stored the name from getname in the audit context, | |
1928 | * then we delay the putname until syscall exit. | |
1929 | * Called from include/linux/fs.h:putname(). | |
1930 | */ | |
1da177e4 LT |
1931 | void audit_putname(const char *name) |
1932 | { | |
1933 | struct audit_context *context = current->audit_context; | |
1934 | ||
1935 | BUG_ON(!context); | |
1936 | if (!context->in_syscall) { | |
1937 | #if AUDIT_DEBUG == 2 | |
1938 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1939 | __FILE__, __LINE__, context->serial, name); | |
1940 | if (context->name_count) { | |
5195d8e2 | 1941 | struct audit_names *n; |
1da177e4 | 1942 | int i; |
5195d8e2 EP |
1943 | |
1944 | list_for_each_entry(n, &context->names_list, list) | |
1da177e4 | 1945 | printk(KERN_ERR "name[%d] = %p = %s\n", i, |
5195d8e2 EP |
1946 | n->name, n->name ?: "(null)"); |
1947 | } | |
1da177e4 LT |
1948 | #endif |
1949 | __putname(name); | |
1950 | } | |
1951 | #if AUDIT_DEBUG | |
1952 | else { | |
1953 | ++context->put_count; | |
1954 | if (context->put_count > context->name_count) { | |
1955 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1956 | " in_syscall=%d putname(%p) name_count=%d" | |
1957 | " put_count=%d\n", | |
1958 | __FILE__, __LINE__, | |
1959 | context->serial, context->major, | |
1960 | context->in_syscall, name, context->name_count, | |
1961 | context->put_count); | |
1962 | dump_stack(); | |
1963 | } | |
1964 | } | |
1965 | #endif | |
1966 | } | |
1967 | ||
851f7ff5 EP |
1968 | static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) |
1969 | { | |
1970 | struct cpu_vfs_cap_data caps; | |
1971 | int rc; | |
1972 | ||
851f7ff5 EP |
1973 | if (!dentry) |
1974 | return 0; | |
1975 | ||
1976 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
1977 | if (rc) | |
1978 | return rc; | |
1979 | ||
1980 | name->fcap.permitted = caps.permitted; | |
1981 | name->fcap.inheritable = caps.inheritable; | |
1982 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
1983 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
1984 | ||
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | ||
3e2efce0 | 1989 | /* Copy inode data into an audit_names. */ |
851f7ff5 EP |
1990 | static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
1991 | const struct inode *inode) | |
8c8570fb | 1992 | { |
3e2efce0 AG |
1993 | name->ino = inode->i_ino; |
1994 | name->dev = inode->i_sb->s_dev; | |
1995 | name->mode = inode->i_mode; | |
1996 | name->uid = inode->i_uid; | |
1997 | name->gid = inode->i_gid; | |
1998 | name->rdev = inode->i_rdev; | |
2a862b32 | 1999 | security_inode_getsecid(inode, &name->osid); |
851f7ff5 | 2000 | audit_copy_fcaps(name, dentry); |
8c8570fb DK |
2001 | } |
2002 | ||
b0dd25a8 RD |
2003 | /** |
2004 | * audit_inode - store the inode and device from a lookup | |
2005 | * @name: name being audited | |
481968f4 | 2006 | * @dentry: dentry being audited |
b0dd25a8 RD |
2007 | * |
2008 | * Called from fs/namei.c:path_lookup(). | |
2009 | */ | |
5a190ae6 | 2010 | void __audit_inode(const char *name, const struct dentry *dentry) |
1da177e4 | 2011 | { |
1da177e4 | 2012 | struct audit_context *context = current->audit_context; |
74c3cbe3 | 2013 | const struct inode *inode = dentry->d_inode; |
5195d8e2 | 2014 | struct audit_names *n; |
1da177e4 LT |
2015 | |
2016 | if (!context->in_syscall) | |
2017 | return; | |
5195d8e2 EP |
2018 | |
2019 | list_for_each_entry_reverse(n, &context->names_list, list) { | |
2020 | if (n->name && (n->name == name)) | |
2021 | goto out; | |
1da177e4 | 2022 | } |
5195d8e2 EP |
2023 | |
2024 | /* unable to find the name from a previous getname() */ | |
2025 | n = audit_alloc_name(context); | |
2026 | if (!n) | |
2027 | return; | |
2028 | out: | |
74c3cbe3 | 2029 | handle_path(dentry); |
5195d8e2 | 2030 | audit_copy_inode(n, dentry, inode); |
73241ccc AG |
2031 | } |
2032 | ||
2033 | /** | |
2034 | * audit_inode_child - collect inode info for created/removed objects | |
481968f4 | 2035 | * @dentry: dentry being audited |
73d3ec5a | 2036 | * @parent: inode of dentry parent |
73241ccc AG |
2037 | * |
2038 | * For syscalls that create or remove filesystem objects, audit_inode | |
2039 | * can only collect information for the filesystem object's parent. | |
2040 | * This call updates the audit context with the child's information. | |
2041 | * Syscalls that create a new filesystem object must be hooked after | |
2042 | * the object is created. Syscalls that remove a filesystem object | |
2043 | * must be hooked prior, in order to capture the target inode during | |
2044 | * unsuccessful attempts. | |
2045 | */ | |
cccc6bba | 2046 | void __audit_inode_child(const struct dentry *dentry, |
73d3ec5a | 2047 | const struct inode *parent) |
73241ccc | 2048 | { |
73241ccc | 2049 | struct audit_context *context = current->audit_context; |
5712e88f | 2050 | const char *found_parent = NULL, *found_child = NULL; |
5a190ae6 | 2051 | const struct inode *inode = dentry->d_inode; |
cccc6bba | 2052 | const char *dname = dentry->d_name.name; |
5195d8e2 | 2053 | struct audit_names *n; |
9c937dcc | 2054 | int dirlen = 0; |
73241ccc AG |
2055 | |
2056 | if (!context->in_syscall) | |
2057 | return; | |
2058 | ||
74c3cbe3 AV |
2059 | if (inode) |
2060 | handle_one(inode); | |
73241ccc | 2061 | |
5712e88f | 2062 | /* parent is more likely, look for it first */ |
5195d8e2 | 2063 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2064 | if (!n->name) |
2065 | continue; | |
2066 | ||
2067 | if (n->ino == parent->i_ino && | |
2068 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2069 | n->name_len = dirlen; /* update parent data in place */ | |
2070 | found_parent = n->name; | |
2071 | goto add_names; | |
f368c07d | 2072 | } |
5712e88f | 2073 | } |
73241ccc | 2074 | |
5712e88f | 2075 | /* no matching parent, look for matching child */ |
5195d8e2 | 2076 | list_for_each_entry(n, &context->names_list, list) { |
5712e88f AG |
2077 | if (!n->name) |
2078 | continue; | |
2079 | ||
2080 | /* strcmp() is the more likely scenario */ | |
2081 | if (!strcmp(dname, n->name) || | |
2082 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2083 | if (inode) | |
851f7ff5 | 2084 | audit_copy_inode(n, NULL, inode); |
5712e88f AG |
2085 | else |
2086 | n->ino = (unsigned long)-1; | |
2087 | found_child = n->name; | |
2088 | goto add_names; | |
2089 | } | |
ac9910ce | 2090 | } |
5712e88f AG |
2091 | |
2092 | add_names: | |
2093 | if (!found_parent) { | |
5195d8e2 EP |
2094 | n = audit_alloc_name(context); |
2095 | if (!n) | |
ac9910ce | 2096 | return; |
5195d8e2 | 2097 | audit_copy_inode(n, NULL, parent); |
73d3ec5a | 2098 | } |
5712e88f AG |
2099 | |
2100 | if (!found_child) { | |
5195d8e2 EP |
2101 | n = audit_alloc_name(context); |
2102 | if (!n) | |
5712e88f | 2103 | return; |
5712e88f AG |
2104 | |
2105 | /* Re-use the name belonging to the slot for a matching parent | |
2106 | * directory. All names for this context are relinquished in | |
2107 | * audit_free_names() */ | |
2108 | if (found_parent) { | |
5195d8e2 EP |
2109 | n->name = found_parent; |
2110 | n->name_len = AUDIT_NAME_FULL; | |
5712e88f | 2111 | /* don't call __putname() */ |
5195d8e2 | 2112 | n->name_put = false; |
5712e88f AG |
2113 | } |
2114 | ||
2115 | if (inode) | |
5195d8e2 | 2116 | audit_copy_inode(n, NULL, inode); |
5712e88f | 2117 | } |
3e2efce0 | 2118 | } |
50e437d5 | 2119 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2120 | |
b0dd25a8 RD |
2121 | /** |
2122 | * auditsc_get_stamp - get local copies of audit_context values | |
2123 | * @ctx: audit_context for the task | |
2124 | * @t: timespec to store time recorded in the audit_context | |
2125 | * @serial: serial value that is recorded in the audit_context | |
2126 | * | |
2127 | * Also sets the context as auditable. | |
2128 | */ | |
48887e63 | 2129 | int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e | 2130 | struct timespec *t, unsigned int *serial) |
1da177e4 | 2131 | { |
48887e63 AV |
2132 | if (!ctx->in_syscall) |
2133 | return 0; | |
ce625a80 DW |
2134 | if (!ctx->serial) |
2135 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2136 | t->tv_sec = ctx->ctime.tv_sec; |
2137 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2138 | *serial = ctx->serial; | |
0590b933 AV |
2139 | if (!ctx->prio) { |
2140 | ctx->prio = 1; | |
2141 | ctx->current_state = AUDIT_RECORD_CONTEXT; | |
2142 | } | |
48887e63 | 2143 | return 1; |
1da177e4 LT |
2144 | } |
2145 | ||
4746ec5b EP |
2146 | /* global counter which is incremented every time something logs in */ |
2147 | static atomic_t session_id = ATOMIC_INIT(0); | |
2148 | ||
b0dd25a8 RD |
2149 | /** |
2150 | * audit_set_loginuid - set a task's audit_context loginuid | |
2151 | * @task: task whose audit context is being modified | |
2152 | * @loginuid: loginuid value | |
2153 | * | |
2154 | * Returns 0. | |
2155 | * | |
2156 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2157 | */ | |
456be6cd | 2158 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 2159 | { |
4746ec5b | 2160 | unsigned int sessionid = atomic_inc_return(&session_id); |
41757106 SG |
2161 | struct audit_context *context = task->audit_context; |
2162 | ||
bfef93a5 AV |
2163 | if (context && context->in_syscall) { |
2164 | struct audit_buffer *ab; | |
2165 | ||
2166 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
2167 | if (ab) { | |
2168 | audit_log_format(ab, "login pid=%d uid=%u " | |
4746ec5b EP |
2169 | "old auid=%u new auid=%u" |
2170 | " old ses=%u new ses=%u", | |
c69e8d9c | 2171 | task->pid, task_uid(task), |
4746ec5b EP |
2172 | task->loginuid, loginuid, |
2173 | task->sessionid, sessionid); | |
bfef93a5 | 2174 | audit_log_end(ab); |
c0404993 | 2175 | } |
1da177e4 | 2176 | } |
4746ec5b | 2177 | task->sessionid = sessionid; |
bfef93a5 | 2178 | task->loginuid = loginuid; |
1da177e4 LT |
2179 | return 0; |
2180 | } | |
2181 | ||
20ca73bc GW |
2182 | /** |
2183 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2184 | * @oflag: open flag | |
2185 | * @mode: mode bits | |
6b962559 | 2186 | * @attr: queue attributes |
20ca73bc | 2187 | * |
20ca73bc | 2188 | */ |
df0a4283 | 2189 | void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) |
20ca73bc | 2190 | { |
20ca73bc GW |
2191 | struct audit_context *context = current->audit_context; |
2192 | ||
564f6993 AV |
2193 | if (attr) |
2194 | memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr)); | |
2195 | else | |
2196 | memset(&context->mq_open.attr, 0, sizeof(struct mq_attr)); | |
20ca73bc | 2197 | |
564f6993 AV |
2198 | context->mq_open.oflag = oflag; |
2199 | context->mq_open.mode = mode; | |
20ca73bc | 2200 | |
564f6993 | 2201 | context->type = AUDIT_MQ_OPEN; |
20ca73bc GW |
2202 | } |
2203 | ||
2204 | /** | |
c32c8af4 | 2205 | * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive |
20ca73bc GW |
2206 | * @mqdes: MQ descriptor |
2207 | * @msg_len: Message length | |
2208 | * @msg_prio: Message priority | |
c32c8af4 | 2209 | * @abs_timeout: Message timeout in absolute time |
20ca73bc | 2210 | * |
20ca73bc | 2211 | */ |
c32c8af4 AV |
2212 | void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, |
2213 | const struct timespec *abs_timeout) | |
20ca73bc | 2214 | { |
20ca73bc | 2215 | struct audit_context *context = current->audit_context; |
c32c8af4 | 2216 | struct timespec *p = &context->mq_sendrecv.abs_timeout; |
20ca73bc | 2217 | |
c32c8af4 AV |
2218 | if (abs_timeout) |
2219 | memcpy(p, abs_timeout, sizeof(struct timespec)); | |
2220 | else | |
2221 | memset(p, 0, sizeof(struct timespec)); | |
20ca73bc | 2222 | |
c32c8af4 AV |
2223 | context->mq_sendrecv.mqdes = mqdes; |
2224 | context->mq_sendrecv.msg_len = msg_len; | |
2225 | context->mq_sendrecv.msg_prio = msg_prio; | |
20ca73bc | 2226 | |
c32c8af4 | 2227 | context->type = AUDIT_MQ_SENDRECV; |
20ca73bc GW |
2228 | } |
2229 | ||
2230 | /** | |
2231 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2232 | * @mqdes: MQ descriptor | |
6b962559 | 2233 | * @notification: Notification event |
20ca73bc | 2234 | * |
20ca73bc GW |
2235 | */ |
2236 | ||
20114f71 | 2237 | void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) |
20ca73bc | 2238 | { |
20ca73bc GW |
2239 | struct audit_context *context = current->audit_context; |
2240 | ||
20114f71 AV |
2241 | if (notification) |
2242 | context->mq_notify.sigev_signo = notification->sigev_signo; | |
2243 | else | |
2244 | context->mq_notify.sigev_signo = 0; | |
20ca73bc | 2245 | |
20114f71 AV |
2246 | context->mq_notify.mqdes = mqdes; |
2247 | context->type = AUDIT_MQ_NOTIFY; | |
20ca73bc GW |
2248 | } |
2249 | ||
2250 | /** | |
2251 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2252 | * @mqdes: MQ descriptor | |
2253 | * @mqstat: MQ flags | |
2254 | * | |
20ca73bc | 2255 | */ |
7392906e | 2256 | void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) |
20ca73bc | 2257 | { |
20ca73bc | 2258 | struct audit_context *context = current->audit_context; |
7392906e AV |
2259 | context->mq_getsetattr.mqdes = mqdes; |
2260 | context->mq_getsetattr.mqstat = *mqstat; | |
2261 | context->type = AUDIT_MQ_GETSETATTR; | |
20ca73bc GW |
2262 | } |
2263 | ||
b0dd25a8 | 2264 | /** |
073115d6 SG |
2265 | * audit_ipc_obj - record audit data for ipc object |
2266 | * @ipcp: ipc permissions | |
2267 | * | |
073115d6 | 2268 | */ |
a33e6751 | 2269 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2270 | { |
073115d6 | 2271 | struct audit_context *context = current->audit_context; |
a33e6751 AV |
2272 | context->ipc.uid = ipcp->uid; |
2273 | context->ipc.gid = ipcp->gid; | |
2274 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2275 | context->ipc.has_perm = 0; |
a33e6751 AV |
2276 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2277 | context->type = AUDIT_IPC; | |
073115d6 SG |
2278 | } |
2279 | ||
2280 | /** | |
2281 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
2282 | * @qbytes: msgq bytes |
2283 | * @uid: msgq user id | |
2284 | * @gid: msgq group id | |
2285 | * @mode: msgq mode (permissions) | |
2286 | * | |
e816f370 | 2287 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2288 | */ |
2570ebbd | 2289 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) |
1da177e4 | 2290 | { |
1da177e4 LT |
2291 | struct audit_context *context = current->audit_context; |
2292 | ||
e816f370 AV |
2293 | context->ipc.qbytes = qbytes; |
2294 | context->ipc.perm_uid = uid; | |
2295 | context->ipc.perm_gid = gid; | |
2296 | context->ipc.perm_mode = mode; | |
2297 | context->ipc.has_perm = 1; | |
1da177e4 | 2298 | } |
c2f0c7c3 | 2299 | |
473ae30b AV |
2300 | int audit_bprm(struct linux_binprm *bprm) |
2301 | { | |
2302 | struct audit_aux_data_execve *ax; | |
2303 | struct audit_context *context = current->audit_context; | |
473ae30b | 2304 | |
5ac3a9c2 | 2305 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
2306 | return 0; |
2307 | ||
bdf4c48a | 2308 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); |
473ae30b AV |
2309 | if (!ax) |
2310 | return -ENOMEM; | |
2311 | ||
2312 | ax->argc = bprm->argc; | |
2313 | ax->envc = bprm->envc; | |
bdf4c48a | 2314 | ax->mm = bprm->mm; |
473ae30b AV |
2315 | ax->d.type = AUDIT_EXECVE; |
2316 | ax->d.next = context->aux; | |
2317 | context->aux = (void *)ax; | |
2318 | return 0; | |
2319 | } | |
2320 | ||
2321 | ||
b0dd25a8 RD |
2322 | /** |
2323 | * audit_socketcall - record audit data for sys_socketcall | |
2324 | * @nargs: number of args | |
2325 | * @args: args array | |
2326 | * | |
b0dd25a8 | 2327 | */ |
f3298dc4 | 2328 | void audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2329 | { |
3ec3b2fb DW |
2330 | struct audit_context *context = current->audit_context; |
2331 | ||
5ac3a9c2 | 2332 | if (likely(!context || context->dummy)) |
f3298dc4 | 2333 | return; |
3ec3b2fb | 2334 | |
f3298dc4 AV |
2335 | context->type = AUDIT_SOCKETCALL; |
2336 | context->socketcall.nargs = nargs; | |
2337 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
3ec3b2fb DW |
2338 | } |
2339 | ||
db349509 AV |
2340 | /** |
2341 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2342 | * @fd1: the first file descriptor | |
2343 | * @fd2: the second file descriptor | |
2344 | * | |
db349509 | 2345 | */ |
157cf649 | 2346 | void __audit_fd_pair(int fd1, int fd2) |
db349509 AV |
2347 | { |
2348 | struct audit_context *context = current->audit_context; | |
157cf649 AV |
2349 | context->fds[0] = fd1; |
2350 | context->fds[1] = fd2; | |
db349509 AV |
2351 | } |
2352 | ||
b0dd25a8 RD |
2353 | /** |
2354 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
2355 | * @len: data length in user space | |
2356 | * @a: data address in kernel space | |
2357 | * | |
2358 | * Returns 0 for success or NULL context or < 0 on error. | |
2359 | */ | |
3ec3b2fb DW |
2360 | int audit_sockaddr(int len, void *a) |
2361 | { | |
3ec3b2fb DW |
2362 | struct audit_context *context = current->audit_context; |
2363 | ||
5ac3a9c2 | 2364 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
2365 | return 0; |
2366 | ||
4f6b434f AV |
2367 | if (!context->sockaddr) { |
2368 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2369 | if (!p) | |
2370 | return -ENOMEM; | |
2371 | context->sockaddr = p; | |
2372 | } | |
3ec3b2fb | 2373 | |
4f6b434f AV |
2374 | context->sockaddr_len = len; |
2375 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2376 | return 0; |
2377 | } | |
2378 | ||
a5cb013d AV |
2379 | void __audit_ptrace(struct task_struct *t) |
2380 | { | |
2381 | struct audit_context *context = current->audit_context; | |
2382 | ||
2383 | context->target_pid = t->pid; | |
c2a7780e | 2384 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2385 | context->target_uid = task_uid(t); |
4746ec5b | 2386 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2387 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2388 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2389 | } |
2390 | ||
b0dd25a8 RD |
2391 | /** |
2392 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2393 | * @sig: signal value | |
2394 | * @t: task being signaled | |
2395 | * | |
2396 | * If the audit subsystem is being terminated, record the task (pid) | |
2397 | * and uid that is doing that. | |
2398 | */ | |
e54dc243 | 2399 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2400 | { |
e54dc243 AG |
2401 | struct audit_aux_data_pids *axp; |
2402 | struct task_struct *tsk = current; | |
2403 | struct audit_context *ctx = tsk->audit_context; | |
c69e8d9c | 2404 | uid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065 | 2405 | |
175fc484 | 2406 | if (audit_pid && t->tgid == audit_pid) { |
ee1d3156 | 2407 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
175fc484 | 2408 | audit_sig_pid = tsk->pid; |
bfef93a5 AV |
2409 | if (tsk->loginuid != -1) |
2410 | audit_sig_uid = tsk->loginuid; | |
175fc484 | 2411 | else |
c69e8d9c | 2412 | audit_sig_uid = uid; |
2a862b32 | 2413 | security_task_getsecid(tsk, &audit_sig_sid); |
175fc484 AV |
2414 | } |
2415 | if (!audit_signals || audit_dummy_context()) | |
2416 | return 0; | |
c2f0c7c3 | 2417 | } |
e54dc243 | 2418 | |
e54dc243 AG |
2419 | /* optimize the common case by putting first signal recipient directly |
2420 | * in audit_context */ | |
2421 | if (!ctx->target_pid) { | |
2422 | ctx->target_pid = t->tgid; | |
c2a7780e | 2423 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2424 | ctx->target_uid = t_uid; |
4746ec5b | 2425 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2426 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2427 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2428 | return 0; |
2429 | } | |
2430 | ||
2431 | axp = (void *)ctx->aux_pids; | |
2432 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2433 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2434 | if (!axp) | |
2435 | return -ENOMEM; | |
2436 | ||
2437 | axp->d.type = AUDIT_OBJ_PID; | |
2438 | axp->d.next = ctx->aux_pids; | |
2439 | ctx->aux_pids = (void *)axp; | |
2440 | } | |
88ae704c | 2441 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2442 | |
2443 | axp->target_pid[axp->pid_count] = t->tgid; | |
c2a7780e | 2444 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2445 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2446 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2447 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2448 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2449 | axp->pid_count++; |
2450 | ||
2451 | return 0; | |
c2f0c7c3 | 2452 | } |
0a4ff8c2 | 2453 | |
3fc689e9 EP |
2454 | /** |
2455 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2456 | * @bprm: pointer to the bprm being processed |
2457 | * @new: the proposed new credentials | |
2458 | * @old: the old credentials | |
3fc689e9 EP |
2459 | * |
2460 | * Simply check if the proc already has the caps given by the file and if not | |
2461 | * store the priv escalation info for later auditing at the end of the syscall | |
2462 | * | |
3fc689e9 EP |
2463 | * -Eric |
2464 | */ | |
d84f4f99 DH |
2465 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2466 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2467 | { |
2468 | struct audit_aux_data_bprm_fcaps *ax; | |
2469 | struct audit_context *context = current->audit_context; | |
2470 | struct cpu_vfs_cap_data vcaps; | |
2471 | struct dentry *dentry; | |
2472 | ||
2473 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2474 | if (!ax) | |
d84f4f99 | 2475 | return -ENOMEM; |
3fc689e9 EP |
2476 | |
2477 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2478 | ax->d.next = context->aux; | |
2479 | context->aux = (void *)ax; | |
2480 | ||
2481 | dentry = dget(bprm->file->f_dentry); | |
2482 | get_vfs_caps_from_disk(dentry, &vcaps); | |
2483 | dput(dentry); | |
2484 | ||
2485 | ax->fcap.permitted = vcaps.permitted; | |
2486 | ax->fcap.inheritable = vcaps.inheritable; | |
2487 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2488 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2489 | ||
d84f4f99 DH |
2490 | ax->old_pcap.permitted = old->cap_permitted; |
2491 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2492 | ax->old_pcap.effective = old->cap_effective; | |
3fc689e9 | 2493 | |
d84f4f99 DH |
2494 | ax->new_pcap.permitted = new->cap_permitted; |
2495 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2496 | ax->new_pcap.effective = new->cap_effective; | |
2497 | return 0; | |
3fc689e9 EP |
2498 | } |
2499 | ||
e68b75a0 EP |
2500 | /** |
2501 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2502 | * @pid: target pid of the capset call |
2503 | * @new: the new credentials | |
2504 | * @old: the old (current) credentials | |
e68b75a0 EP |
2505 | * |
2506 | * Record the aguments userspace sent to sys_capset for later printing by the | |
2507 | * audit system if applicable | |
2508 | */ | |
57f71a0a | 2509 | void __audit_log_capset(pid_t pid, |
d84f4f99 | 2510 | const struct cred *new, const struct cred *old) |
e68b75a0 | 2511 | { |
e68b75a0 | 2512 | struct audit_context *context = current->audit_context; |
57f71a0a AV |
2513 | context->capset.pid = pid; |
2514 | context->capset.cap.effective = new->cap_effective; | |
2515 | context->capset.cap.inheritable = new->cap_effective; | |
2516 | context->capset.cap.permitted = new->cap_permitted; | |
2517 | context->type = AUDIT_CAPSET; | |
e68b75a0 EP |
2518 | } |
2519 | ||
120a795d AV |
2520 | void __audit_mmap_fd(int fd, int flags) |
2521 | { | |
2522 | struct audit_context *context = current->audit_context; | |
2523 | context->mmap.fd = fd; | |
2524 | context->mmap.flags = flags; | |
2525 | context->type = AUDIT_MMAP; | |
2526 | } | |
2527 | ||
0a4ff8c2 SG |
2528 | /** |
2529 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2530 | * @signr: signal value |
0a4ff8c2 SG |
2531 | * |
2532 | * If a process ends with a core dump, something fishy is going on and we | |
2533 | * should record the event for investigation. | |
2534 | */ | |
2535 | void audit_core_dumps(long signr) | |
2536 | { | |
2537 | struct audit_buffer *ab; | |
2538 | u32 sid; | |
76aac0e9 DH |
2539 | uid_t auid = audit_get_loginuid(current), uid; |
2540 | gid_t gid; | |
4746ec5b | 2541 | unsigned int sessionid = audit_get_sessionid(current); |
0a4ff8c2 SG |
2542 | |
2543 | if (!audit_enabled) | |
2544 | return; | |
2545 | ||
2546 | if (signr == SIGQUIT) /* don't care for those */ | |
2547 | return; | |
2548 | ||
2549 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
76aac0e9 | 2550 | current_uid_gid(&uid, &gid); |
4746ec5b | 2551 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", |
76aac0e9 | 2552 | auid, uid, gid, sessionid); |
2a862b32 | 2553 | security_task_getsecid(current, &sid); |
0a4ff8c2 SG |
2554 | if (sid) { |
2555 | char *ctx = NULL; | |
2556 | u32 len; | |
2557 | ||
2a862b32 | 2558 | if (security_secid_to_secctx(sid, &ctx, &len)) |
0a4ff8c2 | 2559 | audit_log_format(ab, " ssid=%u", sid); |
2a862b32 | 2560 | else { |
0a4ff8c2 | 2561 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 AD |
2562 | security_release_secctx(ctx, len); |
2563 | } | |
0a4ff8c2 SG |
2564 | } |
2565 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2566 | audit_log_untrustedstring(ab, current->comm); | |
2567 | audit_log_format(ab, " sig=%ld", signr); | |
2568 | audit_log_end(ab); | |
2569 | } | |
916d7576 AV |
2570 | |
2571 | struct list_head *audit_killed_trees(void) | |
2572 | { | |
2573 | struct audit_context *ctx = current->audit_context; | |
2574 | if (likely(!ctx || !ctx->in_syscall)) | |
2575 | return NULL; | |
2576 | return &ctx->killed_trees; | |
2577 | } |