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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> |
715b49ef | 47 | #include <asm/atomic.h> |
73241ccc AG |
48 | #include <linux/fs.h> |
49 | #include <linux/namei.h> | |
1da177e4 LT |
50 | #include <linux/mm.h> |
51 | #include <linux/module.h> | |
01116105 | 52 | #include <linux/mount.h> |
3ec3b2fb | 53 | #include <linux/socket.h> |
20ca73bc | 54 | #include <linux/mqueue.h> |
1da177e4 LT |
55 | #include <linux/audit.h> |
56 | #include <linux/personality.h> | |
57 | #include <linux/time.h> | |
5bb289b5 | 58 | #include <linux/netlink.h> |
f5561964 | 59 | #include <linux/compiler.h> |
1da177e4 | 60 | #include <asm/unistd.h> |
8c8570fb | 61 | #include <linux/security.h> |
fe7752ba | 62 | #include <linux/list.h> |
a6c043a8 | 63 | #include <linux/tty.h> |
473ae30b | 64 | #include <linux/binfmts.h> |
a1f8e7f7 | 65 | #include <linux/highmem.h> |
f46038ff | 66 | #include <linux/syscalls.h> |
74c3cbe3 | 67 | #include <linux/inotify.h> |
851f7ff5 | 68 | #include <linux/capability.h> |
1da177e4 | 69 | |
fe7752ba | 70 | #include "audit.h" |
1da177e4 | 71 | |
1da177e4 LT |
72 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
73 | * for saving names from getname(). */ | |
74 | #define AUDIT_NAMES 20 | |
75 | ||
9c937dcc AG |
76 | /* Indicates that audit should log the full pathname. */ |
77 | #define AUDIT_NAME_FULL -1 | |
78 | ||
de6bbd1d EP |
79 | /* no execve audit message should be longer than this (userspace limits) */ |
80 | #define MAX_EXECVE_AUDIT_LEN 7500 | |
81 | ||
471a5c7c AV |
82 | /* number of audit rules */ |
83 | int audit_n_rules; | |
84 | ||
e54dc243 AG |
85 | /* determines whether we collect data for signals sent */ |
86 | int audit_signals; | |
87 | ||
851f7ff5 EP |
88 | struct audit_cap_data { |
89 | kernel_cap_t permitted; | |
90 | kernel_cap_t inheritable; | |
91 | union { | |
92 | unsigned int fE; /* effective bit of a file capability */ | |
93 | kernel_cap_t effective; /* effective set of a process */ | |
94 | }; | |
95 | }; | |
96 | ||
1da177e4 LT |
97 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
98 | * we don't let putname() free it (instead we free all of the saved | |
99 | * pointers at syscall exit time). | |
100 | * | |
101 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
102 | struct audit_names { | |
103 | const char *name; | |
9c937dcc AG |
104 | int name_len; /* number of name's characters to log */ |
105 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
106 | unsigned long ino; |
107 | dev_t dev; | |
108 | umode_t mode; | |
109 | uid_t uid; | |
110 | gid_t gid; | |
111 | dev_t rdev; | |
1b50eed9 | 112 | u32 osid; |
851f7ff5 EP |
113 | struct audit_cap_data fcap; |
114 | unsigned int fcap_ver; | |
1da177e4 LT |
115 | }; |
116 | ||
117 | struct audit_aux_data { | |
118 | struct audit_aux_data *next; | |
119 | int type; | |
120 | }; | |
121 | ||
122 | #define AUDIT_AUX_IPCPERM 0 | |
123 | ||
e54dc243 AG |
124 | /* Number of target pids per aux struct. */ |
125 | #define AUDIT_AUX_PIDS 16 | |
126 | ||
20ca73bc GW |
127 | struct audit_aux_data_mq_open { |
128 | struct audit_aux_data d; | |
129 | int oflag; | |
130 | mode_t mode; | |
131 | struct mq_attr attr; | |
132 | }; | |
133 | ||
134 | struct audit_aux_data_mq_sendrecv { | |
135 | struct audit_aux_data d; | |
136 | mqd_t mqdes; | |
137 | size_t msg_len; | |
138 | unsigned int msg_prio; | |
139 | struct timespec abs_timeout; | |
140 | }; | |
141 | ||
142 | struct audit_aux_data_mq_notify { | |
143 | struct audit_aux_data d; | |
144 | mqd_t mqdes; | |
145 | struct sigevent notification; | |
146 | }; | |
147 | ||
148 | struct audit_aux_data_mq_getsetattr { | |
149 | struct audit_aux_data d; | |
150 | mqd_t mqdes; | |
151 | struct mq_attr mqstat; | |
152 | }; | |
153 | ||
473ae30b AV |
154 | struct audit_aux_data_execve { |
155 | struct audit_aux_data d; | |
156 | int argc; | |
157 | int envc; | |
bdf4c48a | 158 | struct mm_struct *mm; |
473ae30b AV |
159 | }; |
160 | ||
db349509 AV |
161 | struct audit_aux_data_fd_pair { |
162 | struct audit_aux_data d; | |
163 | int fd[2]; | |
164 | }; | |
165 | ||
e54dc243 AG |
166 | struct audit_aux_data_pids { |
167 | struct audit_aux_data d; | |
168 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
c2a7780e EP |
169 | uid_t target_auid[AUDIT_AUX_PIDS]; |
170 | uid_t target_uid[AUDIT_AUX_PIDS]; | |
4746ec5b | 171 | unsigned int target_sessionid[AUDIT_AUX_PIDS]; |
e54dc243 | 172 | u32 target_sid[AUDIT_AUX_PIDS]; |
c2a7780e | 173 | char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; |
e54dc243 AG |
174 | int pid_count; |
175 | }; | |
176 | ||
3fc689e9 EP |
177 | struct audit_aux_data_bprm_fcaps { |
178 | struct audit_aux_data d; | |
179 | struct audit_cap_data fcap; | |
180 | unsigned int fcap_ver; | |
181 | struct audit_cap_data old_pcap; | |
182 | struct audit_cap_data new_pcap; | |
183 | }; | |
184 | ||
e68b75a0 EP |
185 | struct audit_aux_data_capset { |
186 | struct audit_aux_data d; | |
187 | pid_t pid; | |
188 | struct audit_cap_data cap; | |
189 | }; | |
190 | ||
74c3cbe3 AV |
191 | struct audit_tree_refs { |
192 | struct audit_tree_refs *next; | |
193 | struct audit_chunk *c[31]; | |
194 | }; | |
195 | ||
1da177e4 LT |
196 | /* The per-task audit context. */ |
197 | struct audit_context { | |
d51374ad | 198 | int dummy; /* must be the first element */ |
1da177e4 LT |
199 | int in_syscall; /* 1 if task is in a syscall */ |
200 | enum audit_state state; | |
201 | unsigned int serial; /* serial number for record */ | |
202 | struct timespec ctime; /* time of syscall entry */ | |
1da177e4 LT |
203 | int major; /* syscall number */ |
204 | unsigned long argv[4]; /* syscall arguments */ | |
205 | int return_valid; /* return code is valid */ | |
2fd6f58b | 206 | long return_code;/* syscall return code */ |
1da177e4 LT |
207 | int auditable; /* 1 if record should be written */ |
208 | int name_count; | |
209 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 210 | char * filterkey; /* key for rule that triggered record */ |
44707fdf | 211 | struct path pwd; |
1da177e4 LT |
212 | struct audit_context *previous; /* For nested syscalls */ |
213 | struct audit_aux_data *aux; | |
e54dc243 | 214 | struct audit_aux_data *aux_pids; |
4f6b434f AV |
215 | struct sockaddr_storage *sockaddr; |
216 | size_t sockaddr_len; | |
1da177e4 | 217 | /* Save things to print about task_struct */ |
f46038ff | 218 | pid_t pid, ppid; |
1da177e4 LT |
219 | uid_t uid, euid, suid, fsuid; |
220 | gid_t gid, egid, sgid, fsgid; | |
221 | unsigned long personality; | |
2fd6f58b | 222 | int arch; |
1da177e4 | 223 | |
a5cb013d | 224 | pid_t target_pid; |
c2a7780e EP |
225 | uid_t target_auid; |
226 | uid_t target_uid; | |
4746ec5b | 227 | unsigned int target_sessionid; |
a5cb013d | 228 | u32 target_sid; |
c2a7780e | 229 | char target_comm[TASK_COMM_LEN]; |
a5cb013d | 230 | |
74c3cbe3 AV |
231 | struct audit_tree_refs *trees, *first_trees; |
232 | int tree_count; | |
233 | ||
f3298dc4 AV |
234 | int type; |
235 | union { | |
236 | struct { | |
237 | int nargs; | |
238 | long args[6]; | |
239 | } socketcall; | |
a33e6751 AV |
240 | struct { |
241 | uid_t uid; | |
242 | gid_t gid; | |
243 | mode_t mode; | |
244 | u32 osid; | |
e816f370 AV |
245 | int has_perm; |
246 | uid_t perm_uid; | |
247 | gid_t perm_gid; | |
248 | mode_t perm_mode; | |
249 | unsigned long qbytes; | |
a33e6751 | 250 | } ipc; |
f3298dc4 AV |
251 | }; |
252 | ||
1da177e4 LT |
253 | #if AUDIT_DEBUG |
254 | int put_count; | |
255 | int ino_count; | |
256 | #endif | |
257 | }; | |
258 | ||
55669bfa AV |
259 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
260 | static inline int open_arg(int flags, int mask) | |
261 | { | |
262 | int n = ACC_MODE(flags); | |
263 | if (flags & (O_TRUNC | O_CREAT)) | |
264 | n |= AUDIT_PERM_WRITE; | |
265 | return n & mask; | |
266 | } | |
267 | ||
268 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
269 | { | |
c4bacefb | 270 | unsigned n; |
1a61c88d | 271 | if (unlikely(!ctx)) |
272 | return 0; | |
c4bacefb | 273 | n = ctx->major; |
dbda4c0b | 274 | |
55669bfa AV |
275 | switch (audit_classify_syscall(ctx->arch, n)) { |
276 | case 0: /* native */ | |
277 | if ((mask & AUDIT_PERM_WRITE) && | |
278 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
279 | return 1; | |
280 | if ((mask & AUDIT_PERM_READ) && | |
281 | audit_match_class(AUDIT_CLASS_READ, n)) | |
282 | return 1; | |
283 | if ((mask & AUDIT_PERM_ATTR) && | |
284 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
285 | return 1; | |
286 | return 0; | |
287 | case 1: /* 32bit on biarch */ | |
288 | if ((mask & AUDIT_PERM_WRITE) && | |
289 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
290 | return 1; | |
291 | if ((mask & AUDIT_PERM_READ) && | |
292 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
293 | return 1; | |
294 | if ((mask & AUDIT_PERM_ATTR) && | |
295 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
296 | return 1; | |
297 | return 0; | |
298 | case 2: /* open */ | |
299 | return mask & ACC_MODE(ctx->argv[1]); | |
300 | case 3: /* openat */ | |
301 | return mask & ACC_MODE(ctx->argv[2]); | |
302 | case 4: /* socketcall */ | |
303 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
304 | case 5: /* execve */ | |
305 | return mask & AUDIT_PERM_EXEC; | |
306 | default: | |
307 | return 0; | |
308 | } | |
309 | } | |
310 | ||
8b67dca9 AV |
311 | static int audit_match_filetype(struct audit_context *ctx, int which) |
312 | { | |
313 | unsigned index = which & ~S_IFMT; | |
314 | mode_t mode = which & S_IFMT; | |
1a61c88d | 315 | |
316 | if (unlikely(!ctx)) | |
317 | return 0; | |
318 | ||
8b67dca9 AV |
319 | if (index >= ctx->name_count) |
320 | return 0; | |
321 | if (ctx->names[index].ino == -1) | |
322 | return 0; | |
323 | if ((ctx->names[index].mode ^ mode) & S_IFMT) | |
324 | return 0; | |
325 | return 1; | |
326 | } | |
327 | ||
74c3cbe3 AV |
328 | /* |
329 | * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *; | |
330 | * ->first_trees points to its beginning, ->trees - to the current end of data. | |
331 | * ->tree_count is the number of free entries in array pointed to by ->trees. | |
332 | * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL, | |
333 | * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously, | |
334 | * it's going to remain 1-element for almost any setup) until we free context itself. | |
335 | * References in it _are_ dropped - at the same time we free/drop aux stuff. | |
336 | */ | |
337 | ||
338 | #ifdef CONFIG_AUDIT_TREE | |
339 | static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk) | |
340 | { | |
341 | struct audit_tree_refs *p = ctx->trees; | |
342 | int left = ctx->tree_count; | |
343 | if (likely(left)) { | |
344 | p->c[--left] = chunk; | |
345 | ctx->tree_count = left; | |
346 | return 1; | |
347 | } | |
348 | if (!p) | |
349 | return 0; | |
350 | p = p->next; | |
351 | if (p) { | |
352 | p->c[30] = chunk; | |
353 | ctx->trees = p; | |
354 | ctx->tree_count = 30; | |
355 | return 1; | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int grow_tree_refs(struct audit_context *ctx) | |
361 | { | |
362 | struct audit_tree_refs *p = ctx->trees; | |
363 | ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL); | |
364 | if (!ctx->trees) { | |
365 | ctx->trees = p; | |
366 | return 0; | |
367 | } | |
368 | if (p) | |
369 | p->next = ctx->trees; | |
370 | else | |
371 | ctx->first_trees = ctx->trees; | |
372 | ctx->tree_count = 31; | |
373 | return 1; | |
374 | } | |
375 | #endif | |
376 | ||
377 | static void unroll_tree_refs(struct audit_context *ctx, | |
378 | struct audit_tree_refs *p, int count) | |
379 | { | |
380 | #ifdef CONFIG_AUDIT_TREE | |
381 | struct audit_tree_refs *q; | |
382 | int n; | |
383 | if (!p) { | |
384 | /* we started with empty chain */ | |
385 | p = ctx->first_trees; | |
386 | count = 31; | |
387 | /* if the very first allocation has failed, nothing to do */ | |
388 | if (!p) | |
389 | return; | |
390 | } | |
391 | n = count; | |
392 | for (q = p; q != ctx->trees; q = q->next, n = 31) { | |
393 | while (n--) { | |
394 | audit_put_chunk(q->c[n]); | |
395 | q->c[n] = NULL; | |
396 | } | |
397 | } | |
398 | while (n-- > ctx->tree_count) { | |
399 | audit_put_chunk(q->c[n]); | |
400 | q->c[n] = NULL; | |
401 | } | |
402 | ctx->trees = p; | |
403 | ctx->tree_count = count; | |
404 | #endif | |
405 | } | |
406 | ||
407 | static void free_tree_refs(struct audit_context *ctx) | |
408 | { | |
409 | struct audit_tree_refs *p, *q; | |
410 | for (p = ctx->first_trees; p; p = q) { | |
411 | q = p->next; | |
412 | kfree(p); | |
413 | } | |
414 | } | |
415 | ||
416 | static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree) | |
417 | { | |
418 | #ifdef CONFIG_AUDIT_TREE | |
419 | struct audit_tree_refs *p; | |
420 | int n; | |
421 | if (!tree) | |
422 | return 0; | |
423 | /* full ones */ | |
424 | for (p = ctx->first_trees; p != ctx->trees; p = p->next) { | |
425 | for (n = 0; n < 31; n++) | |
426 | if (audit_tree_match(p->c[n], tree)) | |
427 | return 1; | |
428 | } | |
429 | /* partial */ | |
430 | if (p) { | |
431 | for (n = ctx->tree_count; n < 31; n++) | |
432 | if (audit_tree_match(p->c[n], tree)) | |
433 | return 1; | |
434 | } | |
435 | #endif | |
436 | return 0; | |
437 | } | |
438 | ||
f368c07d | 439 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
440 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
441 | * otherwise. */ | |
442 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 443 | struct audit_krule *rule, |
1da177e4 | 444 | struct audit_context *ctx, |
f368c07d | 445 | struct audit_names *name, |
1da177e4 LT |
446 | enum audit_state *state) |
447 | { | |
c69e8d9c | 448 | const struct cred *cred = get_task_cred(tsk); |
2ad312d2 | 449 | int i, j, need_sid = 1; |
3dc7e315 DG |
450 | u32 sid; |
451 | ||
1da177e4 | 452 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 453 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
454 | int result = 0; |
455 | ||
93315ed6 | 456 | switch (f->type) { |
1da177e4 | 457 | case AUDIT_PID: |
93315ed6 | 458 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 459 | break; |
3c66251e | 460 | case AUDIT_PPID: |
419c58f1 AV |
461 | if (ctx) { |
462 | if (!ctx->ppid) | |
463 | ctx->ppid = sys_getppid(); | |
3c66251e | 464 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 465 | } |
3c66251e | 466 | break; |
1da177e4 | 467 | case AUDIT_UID: |
b6dff3ec | 468 | result = audit_comparator(cred->uid, f->op, f->val); |
1da177e4 LT |
469 | break; |
470 | case AUDIT_EUID: | |
b6dff3ec | 471 | result = audit_comparator(cred->euid, f->op, f->val); |
1da177e4 LT |
472 | break; |
473 | case AUDIT_SUID: | |
b6dff3ec | 474 | result = audit_comparator(cred->suid, f->op, f->val); |
1da177e4 LT |
475 | break; |
476 | case AUDIT_FSUID: | |
b6dff3ec | 477 | result = audit_comparator(cred->fsuid, f->op, f->val); |
1da177e4 LT |
478 | break; |
479 | case AUDIT_GID: | |
b6dff3ec | 480 | result = audit_comparator(cred->gid, f->op, f->val); |
1da177e4 LT |
481 | break; |
482 | case AUDIT_EGID: | |
b6dff3ec | 483 | result = audit_comparator(cred->egid, f->op, f->val); |
1da177e4 LT |
484 | break; |
485 | case AUDIT_SGID: | |
b6dff3ec | 486 | result = audit_comparator(cred->sgid, f->op, f->val); |
1da177e4 LT |
487 | break; |
488 | case AUDIT_FSGID: | |
b6dff3ec | 489 | result = audit_comparator(cred->fsgid, f->op, f->val); |
1da177e4 LT |
490 | break; |
491 | case AUDIT_PERS: | |
93315ed6 | 492 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 493 | break; |
2fd6f58b | 494 | case AUDIT_ARCH: |
9f8dbe9c | 495 | if (ctx) |
93315ed6 | 496 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 497 | break; |
1da177e4 LT |
498 | |
499 | case AUDIT_EXIT: | |
500 | if (ctx && ctx->return_valid) | |
93315ed6 | 501 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
502 | break; |
503 | case AUDIT_SUCCESS: | |
b01f2cc1 | 504 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
505 | if (f->val) |
506 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 507 | else |
93315ed6 | 508 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 509 | } |
1da177e4 LT |
510 | break; |
511 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
512 | if (name) |
513 | result = audit_comparator(MAJOR(name->dev), | |
514 | f->op, f->val); | |
515 | else if (ctx) { | |
1da177e4 | 516 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 517 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
518 | ++result; |
519 | break; | |
520 | } | |
521 | } | |
522 | } | |
523 | break; | |
524 | case AUDIT_DEVMINOR: | |
f368c07d AG |
525 | if (name) |
526 | result = audit_comparator(MINOR(name->dev), | |
527 | f->op, f->val); | |
528 | else if (ctx) { | |
1da177e4 | 529 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 530 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
531 | ++result; |
532 | break; | |
533 | } | |
534 | } | |
535 | } | |
536 | break; | |
537 | case AUDIT_INODE: | |
f368c07d | 538 | if (name) |
9c937dcc | 539 | result = (name->ino == f->val); |
f368c07d | 540 | else if (ctx) { |
1da177e4 | 541 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 542 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
543 | ++result; |
544 | break; | |
545 | } | |
546 | } | |
547 | } | |
548 | break; | |
f368c07d AG |
549 | case AUDIT_WATCH: |
550 | if (name && rule->watch->ino != (unsigned long)-1) | |
551 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 552 | name->ino == rule->watch->ino); |
f368c07d | 553 | break; |
74c3cbe3 AV |
554 | case AUDIT_DIR: |
555 | if (ctx) | |
556 | result = match_tree_refs(ctx, rule->tree); | |
557 | break; | |
1da177e4 LT |
558 | case AUDIT_LOGINUID: |
559 | result = 0; | |
560 | if (ctx) | |
bfef93a5 | 561 | result = audit_comparator(tsk->loginuid, f->op, f->val); |
1da177e4 | 562 | break; |
3a6b9f85 DG |
563 | case AUDIT_SUBJ_USER: |
564 | case AUDIT_SUBJ_ROLE: | |
565 | case AUDIT_SUBJ_TYPE: | |
566 | case AUDIT_SUBJ_SEN: | |
567 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
568 | /* NOTE: this may return negative values indicating |
569 | a temporary error. We simply treat this as a | |
570 | match for now to avoid losing information that | |
571 | may be wanted. An error message will also be | |
572 | logged upon error */ | |
04305e4a | 573 | if (f->lsm_rule) { |
2ad312d2 | 574 | if (need_sid) { |
2a862b32 | 575 | security_task_getsecid(tsk, &sid); |
2ad312d2 SG |
576 | need_sid = 0; |
577 | } | |
d7a96f3a | 578 | result = security_audit_rule_match(sid, f->type, |
3dc7e315 | 579 | f->op, |
04305e4a | 580 | f->lsm_rule, |
3dc7e315 | 581 | ctx); |
2ad312d2 | 582 | } |
3dc7e315 | 583 | break; |
6e5a2d1d DG |
584 | case AUDIT_OBJ_USER: |
585 | case AUDIT_OBJ_ROLE: | |
586 | case AUDIT_OBJ_TYPE: | |
587 | case AUDIT_OBJ_LEV_LOW: | |
588 | case AUDIT_OBJ_LEV_HIGH: | |
589 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
590 | also applies here */ | |
04305e4a | 591 | if (f->lsm_rule) { |
6e5a2d1d DG |
592 | /* Find files that match */ |
593 | if (name) { | |
d7a96f3a | 594 | result = security_audit_rule_match( |
6e5a2d1d | 595 | name->osid, f->type, f->op, |
04305e4a | 596 | f->lsm_rule, ctx); |
6e5a2d1d DG |
597 | } else if (ctx) { |
598 | for (j = 0; j < ctx->name_count; j++) { | |
d7a96f3a | 599 | if (security_audit_rule_match( |
6e5a2d1d DG |
600 | ctx->names[j].osid, |
601 | f->type, f->op, | |
04305e4a | 602 | f->lsm_rule, ctx)) { |
6e5a2d1d DG |
603 | ++result; |
604 | break; | |
605 | } | |
606 | } | |
607 | } | |
608 | /* Find ipc objects that match */ | |
a33e6751 AV |
609 | if (!ctx || ctx->type != AUDIT_IPC) |
610 | break; | |
611 | if (security_audit_rule_match(ctx->ipc.osid, | |
612 | f->type, f->op, | |
613 | f->lsm_rule, ctx)) | |
614 | ++result; | |
6e5a2d1d DG |
615 | } |
616 | break; | |
1da177e4 LT |
617 | case AUDIT_ARG0: |
618 | case AUDIT_ARG1: | |
619 | case AUDIT_ARG2: | |
620 | case AUDIT_ARG3: | |
621 | if (ctx) | |
93315ed6 | 622 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 623 | break; |
5adc8a6a AG |
624 | case AUDIT_FILTERKEY: |
625 | /* ignore this field for filtering */ | |
626 | result = 1; | |
627 | break; | |
55669bfa AV |
628 | case AUDIT_PERM: |
629 | result = audit_match_perm(ctx, f->val); | |
630 | break; | |
8b67dca9 AV |
631 | case AUDIT_FILETYPE: |
632 | result = audit_match_filetype(ctx, f->val); | |
633 | break; | |
1da177e4 LT |
634 | } |
635 | ||
c69e8d9c DH |
636 | if (!result) { |
637 | put_cred(cred); | |
1da177e4 | 638 | return 0; |
c69e8d9c | 639 | } |
1da177e4 | 640 | } |
980dfb0d | 641 | if (rule->filterkey && ctx) |
5adc8a6a | 642 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); |
1da177e4 LT |
643 | switch (rule->action) { |
644 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
645 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
646 | } | |
c69e8d9c | 647 | put_cred(cred); |
1da177e4 LT |
648 | return 1; |
649 | } | |
650 | ||
651 | /* At process creation time, we can determine if system-call auditing is | |
652 | * completely disabled for this task. Since we only have the task | |
653 | * structure at this point, we can only check uid and gid. | |
654 | */ | |
655 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
656 | { | |
657 | struct audit_entry *e; | |
658 | enum audit_state state; | |
659 | ||
660 | rcu_read_lock(); | |
0f45aa18 | 661 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 662 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
663 | rcu_read_unlock(); |
664 | return state; | |
665 | } | |
666 | } | |
667 | rcu_read_unlock(); | |
668 | return AUDIT_BUILD_CONTEXT; | |
669 | } | |
670 | ||
671 | /* At syscall entry and exit time, this filter is called if the | |
672 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 673 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 674 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
675 | */ |
676 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
677 | struct audit_context *ctx, | |
678 | struct list_head *list) | |
679 | { | |
680 | struct audit_entry *e; | |
c3896495 | 681 | enum audit_state state; |
1da177e4 | 682 | |
351bb722 | 683 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
684 | return AUDIT_DISABLED; |
685 | ||
1da177e4 | 686 | rcu_read_lock(); |
c3896495 | 687 | if (!list_empty(list)) { |
b63862f4 DK |
688 | int word = AUDIT_WORD(ctx->major); |
689 | int bit = AUDIT_BIT(ctx->major); | |
690 | ||
691 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
692 | if ((e->rule.mask[word] & bit) == bit && |
693 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
694 | &state)) { | |
695 | rcu_read_unlock(); | |
696 | return state; | |
697 | } | |
698 | } | |
699 | } | |
700 | rcu_read_unlock(); | |
701 | return AUDIT_BUILD_CONTEXT; | |
702 | } | |
703 | ||
704 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
705 | * collected during syscall processing. We only check rules in sublists at hash | |
706 | * buckets applicable to the inode numbers in audit_names[]. | |
707 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
708 | */ | |
709 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
710 | struct audit_context *ctx) | |
711 | { | |
712 | int i; | |
713 | struct audit_entry *e; | |
714 | enum audit_state state; | |
715 | ||
716 | if (audit_pid && tsk->tgid == audit_pid) | |
717 | return AUDIT_DISABLED; | |
718 | ||
719 | rcu_read_lock(); | |
720 | for (i = 0; i < ctx->name_count; i++) { | |
721 | int word = AUDIT_WORD(ctx->major); | |
722 | int bit = AUDIT_BIT(ctx->major); | |
723 | struct audit_names *n = &ctx->names[i]; | |
724 | int h = audit_hash_ino((u32)n->ino); | |
725 | struct list_head *list = &audit_inode_hash[h]; | |
726 | ||
727 | if (list_empty(list)) | |
728 | continue; | |
729 | ||
730 | list_for_each_entry_rcu(e, list, list) { | |
731 | if ((e->rule.mask[word] & bit) == bit && | |
732 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
733 | rcu_read_unlock(); |
734 | return state; | |
735 | } | |
0f45aa18 DW |
736 | } |
737 | } | |
738 | rcu_read_unlock(); | |
1da177e4 | 739 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
740 | } |
741 | ||
f368c07d AG |
742 | void audit_set_auditable(struct audit_context *ctx) |
743 | { | |
744 | ctx->auditable = 1; | |
745 | } | |
746 | ||
1da177e4 LT |
747 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
748 | int return_valid, | |
749 | int return_code) | |
750 | { | |
751 | struct audit_context *context = tsk->audit_context; | |
752 | ||
753 | if (likely(!context)) | |
754 | return NULL; | |
755 | context->return_valid = return_valid; | |
f701b75e EP |
756 | |
757 | /* | |
758 | * we need to fix up the return code in the audit logs if the actual | |
759 | * return codes are later going to be fixed up by the arch specific | |
760 | * signal handlers | |
761 | * | |
762 | * This is actually a test for: | |
763 | * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) || | |
764 | * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK) | |
765 | * | |
766 | * but is faster than a bunch of || | |
767 | */ | |
768 | if (unlikely(return_code <= -ERESTARTSYS) && | |
769 | (return_code >= -ERESTART_RESTARTBLOCK) && | |
770 | (return_code != -ENOIOCTLCMD)) | |
771 | context->return_code = -EINTR; | |
772 | else | |
773 | context->return_code = return_code; | |
1da177e4 | 774 | |
d51374ad | 775 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 776 | enum audit_state state; |
f368c07d | 777 | |
0f45aa18 | 778 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
779 | if (state == AUDIT_RECORD_CONTEXT) { |
780 | context->auditable = 1; | |
781 | goto get_context; | |
782 | } | |
783 | ||
784 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
785 | if (state == AUDIT_RECORD_CONTEXT) |
786 | context->auditable = 1; | |
f368c07d | 787 | |
1da177e4 LT |
788 | } |
789 | ||
f368c07d | 790 | get_context: |
3f2792ff | 791 | |
1da177e4 LT |
792 | tsk->audit_context = NULL; |
793 | return context; | |
794 | } | |
795 | ||
796 | static inline void audit_free_names(struct audit_context *context) | |
797 | { | |
798 | int i; | |
799 | ||
800 | #if AUDIT_DEBUG == 2 | |
801 | if (context->auditable | |
802 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 803 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
804 | " name_count=%d put_count=%d" |
805 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 806 | __FILE__, __LINE__, |
1da177e4 LT |
807 | context->serial, context->major, context->in_syscall, |
808 | context->name_count, context->put_count, | |
809 | context->ino_count); | |
8c8570fb | 810 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
811 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
812 | context->names[i].name, | |
73241ccc | 813 | context->names[i].name ?: "(null)"); |
8c8570fb | 814 | } |
1da177e4 LT |
815 | dump_stack(); |
816 | return; | |
817 | } | |
818 | #endif | |
819 | #if AUDIT_DEBUG | |
820 | context->put_count = 0; | |
821 | context->ino_count = 0; | |
822 | #endif | |
823 | ||
8c8570fb | 824 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 825 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 826 | __putname(context->names[i].name); |
8c8570fb | 827 | } |
1da177e4 | 828 | context->name_count = 0; |
44707fdf JB |
829 | path_put(&context->pwd); |
830 | context->pwd.dentry = NULL; | |
831 | context->pwd.mnt = NULL; | |
1da177e4 LT |
832 | } |
833 | ||
834 | static inline void audit_free_aux(struct audit_context *context) | |
835 | { | |
836 | struct audit_aux_data *aux; | |
837 | ||
838 | while ((aux = context->aux)) { | |
839 | context->aux = aux->next; | |
840 | kfree(aux); | |
841 | } | |
e54dc243 AG |
842 | while ((aux = context->aux_pids)) { |
843 | context->aux_pids = aux->next; | |
844 | kfree(aux); | |
845 | } | |
1da177e4 LT |
846 | } |
847 | ||
848 | static inline void audit_zero_context(struct audit_context *context, | |
849 | enum audit_state state) | |
850 | { | |
1da177e4 LT |
851 | memset(context, 0, sizeof(*context)); |
852 | context->state = state; | |
1da177e4 LT |
853 | } |
854 | ||
855 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
856 | { | |
857 | struct audit_context *context; | |
858 | ||
859 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
860 | return NULL; | |
861 | audit_zero_context(context, state); | |
862 | return context; | |
863 | } | |
864 | ||
b0dd25a8 RD |
865 | /** |
866 | * audit_alloc - allocate an audit context block for a task | |
867 | * @tsk: task | |
868 | * | |
869 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
870 | * if necessary. Doing so turns on system call auditing for the |
871 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
872 | * needed. |
873 | */ | |
1da177e4 LT |
874 | int audit_alloc(struct task_struct *tsk) |
875 | { | |
876 | struct audit_context *context; | |
877 | enum audit_state state; | |
878 | ||
b593d384 | 879 | if (likely(!audit_ever_enabled)) |
1da177e4 LT |
880 | return 0; /* Return if not auditing. */ |
881 | ||
882 | state = audit_filter_task(tsk); | |
883 | if (likely(state == AUDIT_DISABLED)) | |
884 | return 0; | |
885 | ||
886 | if (!(context = audit_alloc_context(state))) { | |
887 | audit_log_lost("out of memory in audit_alloc"); | |
888 | return -ENOMEM; | |
889 | } | |
890 | ||
1da177e4 LT |
891 | tsk->audit_context = context; |
892 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
893 | return 0; | |
894 | } | |
895 | ||
896 | static inline void audit_free_context(struct audit_context *context) | |
897 | { | |
898 | struct audit_context *previous; | |
899 | int count = 0; | |
900 | ||
901 | do { | |
902 | previous = context->previous; | |
903 | if (previous || (count && count < 10)) { | |
904 | ++count; | |
905 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
906 | " freeing multiple contexts (%d)\n", | |
907 | context->serial, context->major, | |
908 | context->name_count, count); | |
909 | } | |
910 | audit_free_names(context); | |
74c3cbe3 AV |
911 | unroll_tree_refs(context, NULL, 0); |
912 | free_tree_refs(context); | |
1da177e4 | 913 | audit_free_aux(context); |
5adc8a6a | 914 | kfree(context->filterkey); |
4f6b434f | 915 | kfree(context->sockaddr); |
1da177e4 LT |
916 | kfree(context); |
917 | context = previous; | |
918 | } while (context); | |
919 | if (count >= 10) | |
920 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
921 | } | |
922 | ||
161a09e7 | 923 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
924 | { |
925 | char *ctx = NULL; | |
c4823bce AV |
926 | unsigned len; |
927 | int error; | |
928 | u32 sid; | |
929 | ||
2a862b32 | 930 | security_task_getsecid(current, &sid); |
c4823bce AV |
931 | if (!sid) |
932 | return; | |
8c8570fb | 933 | |
2a862b32 | 934 | error = security_secid_to_secctx(sid, &ctx, &len); |
c4823bce AV |
935 | if (error) { |
936 | if (error != -EINVAL) | |
8c8570fb DK |
937 | goto error_path; |
938 | return; | |
939 | } | |
940 | ||
8c8570fb | 941 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 | 942 | security_release_secctx(ctx, len); |
7306a0b9 | 943 | return; |
8c8570fb DK |
944 | |
945 | error_path: | |
7306a0b9 | 946 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
947 | return; |
948 | } | |
949 | ||
161a09e7 JL |
950 | EXPORT_SYMBOL(audit_log_task_context); |
951 | ||
e495149b | 952 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 953 | { |
45d9bb0e AV |
954 | char name[sizeof(tsk->comm)]; |
955 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
956 | struct vm_area_struct *vma; |
957 | ||
e495149b AV |
958 | /* tsk == current */ |
959 | ||
45d9bb0e | 960 | get_task_comm(name, tsk); |
99e45eea DW |
961 | audit_log_format(ab, " comm="); |
962 | audit_log_untrustedstring(ab, name); | |
219f0817 | 963 | |
e495149b AV |
964 | if (mm) { |
965 | down_read(&mm->mmap_sem); | |
966 | vma = mm->mmap; | |
967 | while (vma) { | |
968 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
969 | vma->vm_file) { | |
970 | audit_log_d_path(ab, "exe=", | |
44707fdf | 971 | &vma->vm_file->f_path); |
e495149b AV |
972 | break; |
973 | } | |
974 | vma = vma->vm_next; | |
219f0817 | 975 | } |
e495149b | 976 | up_read(&mm->mmap_sem); |
219f0817 | 977 | } |
e495149b | 978 | audit_log_task_context(ab); |
219f0817 SS |
979 | } |
980 | ||
e54dc243 | 981 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
4746ec5b EP |
982 | uid_t auid, uid_t uid, unsigned int sessionid, |
983 | u32 sid, char *comm) | |
e54dc243 AG |
984 | { |
985 | struct audit_buffer *ab; | |
2a862b32 | 986 | char *ctx = NULL; |
e54dc243 AG |
987 | u32 len; |
988 | int rc = 0; | |
989 | ||
990 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
991 | if (!ab) | |
6246ccab | 992 | return rc; |
e54dc243 | 993 | |
4746ec5b EP |
994 | audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid, |
995 | uid, sessionid); | |
2a862b32 | 996 | if (security_secid_to_secctx(sid, &ctx, &len)) { |
c2a7780e | 997 | audit_log_format(ab, " obj=(none)"); |
e54dc243 | 998 | rc = 1; |
2a862b32 AD |
999 | } else { |
1000 | audit_log_format(ab, " obj=%s", ctx); | |
1001 | security_release_secctx(ctx, len); | |
1002 | } | |
c2a7780e EP |
1003 | audit_log_format(ab, " ocomm="); |
1004 | audit_log_untrustedstring(ab, comm); | |
e54dc243 | 1005 | audit_log_end(ab); |
e54dc243 AG |
1006 | |
1007 | return rc; | |
1008 | } | |
1009 | ||
de6bbd1d EP |
1010 | /* |
1011 | * to_send and len_sent accounting are very loose estimates. We aren't | |
1012 | * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being | |
1013 | * within about 500 bytes (next page boundry) | |
1014 | * | |
1015 | * why snprintf? an int is up to 12 digits long. if we just assumed when | |
1016 | * logging that a[%d]= was going to be 16 characters long we would be wasting | |
1017 | * space in every audit message. In one 7500 byte message we can log up to | |
1018 | * about 1000 min size arguments. That comes down to about 50% waste of space | |
1019 | * if we didn't do the snprintf to find out how long arg_num_len was. | |
1020 | */ | |
1021 | static int audit_log_single_execve_arg(struct audit_context *context, | |
1022 | struct audit_buffer **ab, | |
1023 | int arg_num, | |
1024 | size_t *len_sent, | |
1025 | const char __user *p, | |
1026 | char *buf) | |
bdf4c48a | 1027 | { |
de6bbd1d EP |
1028 | char arg_num_len_buf[12]; |
1029 | const char __user *tmp_p = p; | |
1030 | /* how many digits are in arg_num? 3 is the length of a=\n */ | |
1031 | size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3; | |
1032 | size_t len, len_left, to_send; | |
1033 | size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN; | |
1034 | unsigned int i, has_cntl = 0, too_long = 0; | |
1035 | int ret; | |
1036 | ||
1037 | /* strnlen_user includes the null we don't want to send */ | |
1038 | len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1; | |
bdf4c48a | 1039 | |
de6bbd1d EP |
1040 | /* |
1041 | * We just created this mm, if we can't find the strings | |
1042 | * we just copied into it something is _very_ wrong. Similar | |
1043 | * for strings that are too long, we should not have created | |
1044 | * any. | |
1045 | */ | |
b0abcfc1 | 1046 | if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) { |
de6bbd1d EP |
1047 | WARN_ON(1); |
1048 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1049 | return -1; |
de6bbd1d | 1050 | } |
040b3a2d | 1051 | |
de6bbd1d EP |
1052 | /* walk the whole argument looking for non-ascii chars */ |
1053 | do { | |
1054 | if (len_left > MAX_EXECVE_AUDIT_LEN) | |
1055 | to_send = MAX_EXECVE_AUDIT_LEN; | |
1056 | else | |
1057 | to_send = len_left; | |
1058 | ret = copy_from_user(buf, tmp_p, to_send); | |
bdf4c48a | 1059 | /* |
de6bbd1d EP |
1060 | * There is no reason for this copy to be short. We just |
1061 | * copied them here, and the mm hasn't been exposed to user- | |
1062 | * space yet. | |
bdf4c48a | 1063 | */ |
de6bbd1d | 1064 | if (ret) { |
bdf4c48a PZ |
1065 | WARN_ON(1); |
1066 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1067 | return -1; |
bdf4c48a | 1068 | } |
de6bbd1d EP |
1069 | buf[to_send] = '\0'; |
1070 | has_cntl = audit_string_contains_control(buf, to_send); | |
1071 | if (has_cntl) { | |
1072 | /* | |
1073 | * hex messages get logged as 2 bytes, so we can only | |
1074 | * send half as much in each message | |
1075 | */ | |
1076 | max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2; | |
bdf4c48a PZ |
1077 | break; |
1078 | } | |
de6bbd1d EP |
1079 | len_left -= to_send; |
1080 | tmp_p += to_send; | |
1081 | } while (len_left > 0); | |
1082 | ||
1083 | len_left = len; | |
1084 | ||
1085 | if (len > max_execve_audit_len) | |
1086 | too_long = 1; | |
1087 | ||
1088 | /* rewalk the argument actually logging the message */ | |
1089 | for (i = 0; len_left > 0; i++) { | |
1090 | int room_left; | |
1091 | ||
1092 | if (len_left > max_execve_audit_len) | |
1093 | to_send = max_execve_audit_len; | |
1094 | else | |
1095 | to_send = len_left; | |
1096 | ||
1097 | /* do we have space left to send this argument in this ab? */ | |
1098 | room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent; | |
1099 | if (has_cntl) | |
1100 | room_left -= (to_send * 2); | |
1101 | else | |
1102 | room_left -= to_send; | |
1103 | if (room_left < 0) { | |
1104 | *len_sent = 0; | |
1105 | audit_log_end(*ab); | |
1106 | *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE); | |
1107 | if (!*ab) | |
1108 | return 0; | |
1109 | } | |
bdf4c48a | 1110 | |
bdf4c48a | 1111 | /* |
de6bbd1d EP |
1112 | * first record needs to say how long the original string was |
1113 | * so we can be sure nothing was lost. | |
1114 | */ | |
1115 | if ((i == 0) && (too_long)) | |
422b03cf | 1116 | audit_log_format(*ab, "a%d_len=%zu ", arg_num, |
de6bbd1d EP |
1117 | has_cntl ? 2*len : len); |
1118 | ||
1119 | /* | |
1120 | * normally arguments are small enough to fit and we already | |
1121 | * filled buf above when we checked for control characters | |
1122 | * so don't bother with another copy_from_user | |
bdf4c48a | 1123 | */ |
de6bbd1d EP |
1124 | if (len >= max_execve_audit_len) |
1125 | ret = copy_from_user(buf, p, to_send); | |
1126 | else | |
1127 | ret = 0; | |
040b3a2d | 1128 | if (ret) { |
bdf4c48a PZ |
1129 | WARN_ON(1); |
1130 | send_sig(SIGKILL, current, 0); | |
b0abcfc1 | 1131 | return -1; |
bdf4c48a | 1132 | } |
de6bbd1d EP |
1133 | buf[to_send] = '\0'; |
1134 | ||
1135 | /* actually log it */ | |
1136 | audit_log_format(*ab, "a%d", arg_num); | |
1137 | if (too_long) | |
1138 | audit_log_format(*ab, "[%d]", i); | |
1139 | audit_log_format(*ab, "="); | |
1140 | if (has_cntl) | |
b556f8ad | 1141 | audit_log_n_hex(*ab, buf, to_send); |
de6bbd1d EP |
1142 | else |
1143 | audit_log_format(*ab, "\"%s\"", buf); | |
1144 | audit_log_format(*ab, "\n"); | |
1145 | ||
1146 | p += to_send; | |
1147 | len_left -= to_send; | |
1148 | *len_sent += arg_num_len; | |
1149 | if (has_cntl) | |
1150 | *len_sent += to_send * 2; | |
1151 | else | |
1152 | *len_sent += to_send; | |
1153 | } | |
1154 | /* include the null we didn't log */ | |
1155 | return len + 1; | |
1156 | } | |
1157 | ||
1158 | static void audit_log_execve_info(struct audit_context *context, | |
1159 | struct audit_buffer **ab, | |
1160 | struct audit_aux_data_execve *axi) | |
1161 | { | |
1162 | int i; | |
1163 | size_t len, len_sent = 0; | |
1164 | const char __user *p; | |
1165 | char *buf; | |
bdf4c48a | 1166 | |
de6bbd1d EP |
1167 | if (axi->mm != current->mm) |
1168 | return; /* execve failed, no additional info */ | |
1169 | ||
1170 | p = (const char __user *)axi->mm->arg_start; | |
bdf4c48a | 1171 | |
de6bbd1d EP |
1172 | audit_log_format(*ab, "argc=%d ", axi->argc); |
1173 | ||
1174 | /* | |
1175 | * we need some kernel buffer to hold the userspace args. Just | |
1176 | * allocate one big one rather than allocating one of the right size | |
1177 | * for every single argument inside audit_log_single_execve_arg() | |
1178 | * should be <8k allocation so should be pretty safe. | |
1179 | */ | |
1180 | buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL); | |
1181 | if (!buf) { | |
1182 | audit_panic("out of memory for argv string\n"); | |
1183 | return; | |
bdf4c48a | 1184 | } |
de6bbd1d EP |
1185 | |
1186 | for (i = 0; i < axi->argc; i++) { | |
1187 | len = audit_log_single_execve_arg(context, ab, i, | |
1188 | &len_sent, p, buf); | |
1189 | if (len <= 0) | |
1190 | break; | |
1191 | p += len; | |
1192 | } | |
1193 | kfree(buf); | |
bdf4c48a PZ |
1194 | } |
1195 | ||
851f7ff5 EP |
1196 | static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1197 | { | |
1198 | int i; | |
1199 | ||
1200 | audit_log_format(ab, " %s=", prefix); | |
1201 | CAP_FOR_EACH_U32(i) { | |
1202 | audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) | |
1207 | { | |
1208 | kernel_cap_t *perm = &name->fcap.permitted; | |
1209 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1210 | int log = 0; | |
1211 | ||
1212 | if (!cap_isclear(*perm)) { | |
1213 | audit_log_cap(ab, "cap_fp", perm); | |
1214 | log = 1; | |
1215 | } | |
1216 | if (!cap_isclear(*inh)) { | |
1217 | audit_log_cap(ab, "cap_fi", inh); | |
1218 | log = 1; | |
1219 | } | |
1220 | ||
1221 | if (log) | |
1222 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); | |
1223 | } | |
1224 | ||
a33e6751 | 1225 | static void show_special(struct audit_context *context, int *call_panic) |
f3298dc4 AV |
1226 | { |
1227 | struct audit_buffer *ab; | |
1228 | int i; | |
1229 | ||
1230 | ab = audit_log_start(context, GFP_KERNEL, context->type); | |
1231 | if (!ab) | |
1232 | return; | |
1233 | ||
1234 | switch (context->type) { | |
1235 | case AUDIT_SOCKETCALL: { | |
1236 | int nargs = context->socketcall.nargs; | |
1237 | audit_log_format(ab, "nargs=%d", nargs); | |
1238 | for (i = 0; i < nargs; i++) | |
1239 | audit_log_format(ab, " a%d=%lx", i, | |
1240 | context->socketcall.args[i]); | |
1241 | break; } | |
a33e6751 AV |
1242 | case AUDIT_IPC: { |
1243 | u32 osid = context->ipc.osid; | |
1244 | ||
1245 | audit_log_format(ab, "ouid=%u ogid=%u mode=%#o", | |
1246 | context->ipc.uid, context->ipc.gid, context->ipc.mode); | |
1247 | if (osid) { | |
1248 | char *ctx = NULL; | |
1249 | u32 len; | |
1250 | if (security_secid_to_secctx(osid, &ctx, &len)) { | |
1251 | audit_log_format(ab, " osid=%u", osid); | |
1252 | *call_panic = 1; | |
1253 | } else { | |
1254 | audit_log_format(ab, " obj=%s", ctx); | |
1255 | security_release_secctx(ctx, len); | |
1256 | } | |
1257 | } | |
e816f370 AV |
1258 | if (context->ipc.has_perm) { |
1259 | audit_log_end(ab); | |
1260 | ab = audit_log_start(context, GFP_KERNEL, | |
1261 | AUDIT_IPC_SET_PERM); | |
1262 | audit_log_format(ab, | |
1263 | "qbytes=%lx ouid=%u ogid=%u mode=%#o", | |
1264 | context->ipc.qbytes, | |
1265 | context->ipc.perm_uid, | |
1266 | context->ipc.perm_gid, | |
1267 | context->ipc.perm_mode); | |
1268 | if (!ab) | |
1269 | return; | |
1270 | } | |
a33e6751 | 1271 | break; } |
f3298dc4 AV |
1272 | } |
1273 | audit_log_end(ab); | |
1274 | } | |
1275 | ||
e495149b | 1276 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 1277 | { |
c69e8d9c | 1278 | const struct cred *cred; |
9c7aa6aa | 1279 | int i, call_panic = 0; |
1da177e4 | 1280 | struct audit_buffer *ab; |
7551ced3 | 1281 | struct audit_aux_data *aux; |
a6c043a8 | 1282 | const char *tty; |
1da177e4 | 1283 | |
e495149b | 1284 | /* tsk == current */ |
3f2792ff | 1285 | context->pid = tsk->pid; |
419c58f1 AV |
1286 | if (!context->ppid) |
1287 | context->ppid = sys_getppid(); | |
c69e8d9c DH |
1288 | cred = current_cred(); |
1289 | context->uid = cred->uid; | |
1290 | context->gid = cred->gid; | |
1291 | context->euid = cred->euid; | |
1292 | context->suid = cred->suid; | |
b6dff3ec | 1293 | context->fsuid = cred->fsuid; |
c69e8d9c DH |
1294 | context->egid = cred->egid; |
1295 | context->sgid = cred->sgid; | |
b6dff3ec | 1296 | context->fsgid = cred->fsgid; |
3f2792ff | 1297 | context->personality = tsk->personality; |
e495149b AV |
1298 | |
1299 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
1300 | if (!ab) |
1301 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
1302 | audit_log_format(ab, "arch=%x syscall=%d", |
1303 | context->arch, context->major); | |
1da177e4 LT |
1304 | if (context->personality != PER_LINUX) |
1305 | audit_log_format(ab, " per=%lx", context->personality); | |
1306 | if (context->return_valid) | |
9f8dbe9c | 1307 | audit_log_format(ab, " success=%s exit=%ld", |
2fd6f58b DW |
1308 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", |
1309 | context->return_code); | |
eb84a20e | 1310 | |
dbda4c0b | 1311 | spin_lock_irq(&tsk->sighand->siglock); |
45d9bb0e AV |
1312 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
1313 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
1314 | else |
1315 | tty = "(none)"; | |
dbda4c0b AC |
1316 | spin_unlock_irq(&tsk->sighand->siglock); |
1317 | ||
1da177e4 LT |
1318 | audit_log_format(ab, |
1319 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 1320 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 1321 | " euid=%u suid=%u fsuid=%u" |
4746ec5b | 1322 | " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
1da177e4 LT |
1323 | context->argv[0], |
1324 | context->argv[1], | |
1325 | context->argv[2], | |
1326 | context->argv[3], | |
1327 | context->name_count, | |
f46038ff | 1328 | context->ppid, |
1da177e4 | 1329 | context->pid, |
bfef93a5 | 1330 | tsk->loginuid, |
1da177e4 LT |
1331 | context->uid, |
1332 | context->gid, | |
1333 | context->euid, context->suid, context->fsuid, | |
4746ec5b EP |
1334 | context->egid, context->sgid, context->fsgid, tty, |
1335 | tsk->sessionid); | |
eb84a20e | 1336 | |
eb84a20e | 1337 | |
e495149b | 1338 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
1339 | if (context->filterkey) { |
1340 | audit_log_format(ab, " key="); | |
1341 | audit_log_untrustedstring(ab, context->filterkey); | |
1342 | } else | |
1343 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 1344 | audit_log_end(ab); |
1da177e4 | 1345 | |
7551ced3 | 1346 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 1347 | |
e495149b | 1348 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
1349 | if (!ab) |
1350 | continue; /* audit_panic has been called */ | |
1351 | ||
1da177e4 | 1352 | switch (aux->type) { |
20ca73bc GW |
1353 | case AUDIT_MQ_OPEN: { |
1354 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
1355 | audit_log_format(ab, | |
1356 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
1357 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
1358 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
1359 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
1360 | axi->attr.mq_curmsgs); | |
1361 | break; } | |
1362 | ||
1363 | case AUDIT_MQ_SENDRECV: { | |
1364 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
1365 | audit_log_format(ab, | |
1366 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
1367 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
1368 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
1369 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
1370 | break; } | |
1371 | ||
1372 | case AUDIT_MQ_NOTIFY: { | |
1373 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
1374 | audit_log_format(ab, | |
1375 | "mqdes=%d sigev_signo=%d", | |
1376 | axi->mqdes, | |
1377 | axi->notification.sigev_signo); | |
1378 | break; } | |
1379 | ||
1380 | case AUDIT_MQ_GETSETATTR: { | |
1381 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
1382 | audit_log_format(ab, | |
1383 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
1384 | "mq_curmsgs=%ld ", | |
1385 | axi->mqdes, | |
1386 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
1387 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
1388 | break; } | |
1389 | ||
473ae30b AV |
1390 | case AUDIT_EXECVE: { |
1391 | struct audit_aux_data_execve *axi = (void *)aux; | |
de6bbd1d | 1392 | audit_log_execve_info(context, &ab, axi); |
473ae30b | 1393 | break; } |
073115d6 | 1394 | |
db349509 AV |
1395 | case AUDIT_FD_PAIR: { |
1396 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
1397 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
1398 | break; } | |
1399 | ||
3fc689e9 EP |
1400 | case AUDIT_BPRM_FCAPS: { |
1401 | struct audit_aux_data_bprm_fcaps *axs = (void *)aux; | |
1402 | audit_log_format(ab, "fver=%x", axs->fcap_ver); | |
1403 | audit_log_cap(ab, "fp", &axs->fcap.permitted); | |
1404 | audit_log_cap(ab, "fi", &axs->fcap.inheritable); | |
1405 | audit_log_format(ab, " fe=%d", axs->fcap.fE); | |
1406 | audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted); | |
1407 | audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable); | |
1408 | audit_log_cap(ab, "old_pe", &axs->old_pcap.effective); | |
1409 | audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted); | |
1410 | audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable); | |
1411 | audit_log_cap(ab, "new_pe", &axs->new_pcap.effective); | |
1412 | break; } | |
1413 | ||
e68b75a0 EP |
1414 | case AUDIT_CAPSET: { |
1415 | struct audit_aux_data_capset *axs = (void *)aux; | |
1416 | audit_log_format(ab, "pid=%d", axs->pid); | |
1417 | audit_log_cap(ab, "cap_pi", &axs->cap.inheritable); | |
1418 | audit_log_cap(ab, "cap_pp", &axs->cap.permitted); | |
1419 | audit_log_cap(ab, "cap_pe", &axs->cap.effective); | |
1420 | break; } | |
1421 | ||
1da177e4 LT |
1422 | } |
1423 | audit_log_end(ab); | |
1da177e4 LT |
1424 | } |
1425 | ||
f3298dc4 | 1426 | if (context->type) |
a33e6751 | 1427 | show_special(context, &call_panic); |
f3298dc4 | 1428 | |
4f6b434f AV |
1429 | if (context->sockaddr_len) { |
1430 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR); | |
1431 | if (ab) { | |
1432 | audit_log_format(ab, "saddr="); | |
1433 | audit_log_n_hex(ab, (void *)context->sockaddr, | |
1434 | context->sockaddr_len); | |
1435 | audit_log_end(ab); | |
1436 | } | |
1437 | } | |
1438 | ||
e54dc243 AG |
1439 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1440 | struct audit_aux_data_pids *axs = (void *)aux; | |
e54dc243 AG |
1441 | |
1442 | for (i = 0; i < axs->pid_count; i++) | |
1443 | if (audit_log_pid_context(context, axs->target_pid[i], | |
c2a7780e EP |
1444 | axs->target_auid[i], |
1445 | axs->target_uid[i], | |
4746ec5b | 1446 | axs->target_sessionid[i], |
c2a7780e EP |
1447 | axs->target_sid[i], |
1448 | axs->target_comm[i])) | |
e54dc243 | 1449 | call_panic = 1; |
a5cb013d AV |
1450 | } |
1451 | ||
e54dc243 AG |
1452 | if (context->target_pid && |
1453 | audit_log_pid_context(context, context->target_pid, | |
c2a7780e | 1454 | context->target_auid, context->target_uid, |
4746ec5b | 1455 | context->target_sessionid, |
c2a7780e | 1456 | context->target_sid, context->target_comm)) |
e54dc243 AG |
1457 | call_panic = 1; |
1458 | ||
44707fdf | 1459 | if (context->pwd.dentry && context->pwd.mnt) { |
e495149b | 1460 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c | 1461 | if (ab) { |
44707fdf | 1462 | audit_log_d_path(ab, "cwd=", &context->pwd); |
8f37d47c DW |
1463 | audit_log_end(ab); |
1464 | } | |
1465 | } | |
1da177e4 | 1466 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 1467 | struct audit_names *n = &context->names[i]; |
73241ccc | 1468 | |
e495149b | 1469 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
1470 | if (!ab) |
1471 | continue; /* audit_panic has been called */ | |
8f37d47c | 1472 | |
1da177e4 | 1473 | audit_log_format(ab, "item=%d", i); |
73241ccc | 1474 | |
9c937dcc AG |
1475 | if (n->name) { |
1476 | switch(n->name_len) { | |
1477 | case AUDIT_NAME_FULL: | |
1478 | /* log the full path */ | |
1479 | audit_log_format(ab, " name="); | |
1480 | audit_log_untrustedstring(ab, n->name); | |
1481 | break; | |
1482 | case 0: | |
1483 | /* name was specified as a relative path and the | |
1484 | * directory component is the cwd */ | |
44707fdf | 1485 | audit_log_d_path(ab, " name=", &context->pwd); |
9c937dcc AG |
1486 | break; |
1487 | default: | |
1488 | /* log the name's directory component */ | |
1489 | audit_log_format(ab, " name="); | |
b556f8ad EP |
1490 | audit_log_n_untrustedstring(ab, n->name, |
1491 | n->name_len); | |
9c937dcc AG |
1492 | } |
1493 | } else | |
1494 | audit_log_format(ab, " name=(null)"); | |
1495 | ||
1496 | if (n->ino != (unsigned long)-1) { | |
1497 | audit_log_format(ab, " inode=%lu" | |
1498 | " dev=%02x:%02x mode=%#o" | |
1499 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1500 | n->ino, | |
1501 | MAJOR(n->dev), | |
1502 | MINOR(n->dev), | |
1503 | n->mode, | |
1504 | n->uid, | |
1505 | n->gid, | |
1506 | MAJOR(n->rdev), | |
1507 | MINOR(n->rdev)); | |
1508 | } | |
1509 | if (n->osid != 0) { | |
1b50eed9 SG |
1510 | char *ctx = NULL; |
1511 | u32 len; | |
2a862b32 | 1512 | if (security_secid_to_secctx( |
9c937dcc AG |
1513 | n->osid, &ctx, &len)) { |
1514 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1515 | call_panic = 2; |
2a862b32 | 1516 | } else { |
1b50eed9 | 1517 | audit_log_format(ab, " obj=%s", ctx); |
2a862b32 AD |
1518 | security_release_secctx(ctx, len); |
1519 | } | |
8c8570fb DK |
1520 | } |
1521 | ||
851f7ff5 EP |
1522 | audit_log_fcaps(ab, n); |
1523 | ||
1da177e4 LT |
1524 | audit_log_end(ab); |
1525 | } | |
c0641f28 EP |
1526 | |
1527 | /* Send end of event record to help user space know we are finished */ | |
1528 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); | |
1529 | if (ab) | |
1530 | audit_log_end(ab); | |
9c7aa6aa SG |
1531 | if (call_panic) |
1532 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1533 | } |
1534 | ||
b0dd25a8 RD |
1535 | /** |
1536 | * audit_free - free a per-task audit context | |
1537 | * @tsk: task whose audit context block to free | |
1538 | * | |
fa84cb93 | 1539 | * Called from copy_process and do_exit |
b0dd25a8 | 1540 | */ |
1da177e4 LT |
1541 | void audit_free(struct task_struct *tsk) |
1542 | { | |
1543 | struct audit_context *context; | |
1544 | ||
1da177e4 | 1545 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1546 | if (likely(!context)) |
1547 | return; | |
1548 | ||
1549 | /* Check for system calls that do not go through the exit | |
9f8dbe9c DW |
1550 | * function (e.g., exit_group), then free context block. |
1551 | * We use GFP_ATOMIC here because we might be doing this | |
f5561964 | 1552 | * in the context of the idle thread */ |
e495149b | 1553 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1554 | if (context->in_syscall && context->auditable) |
e495149b | 1555 | audit_log_exit(context, tsk); |
1da177e4 LT |
1556 | |
1557 | audit_free_context(context); | |
1558 | } | |
1559 | ||
b0dd25a8 RD |
1560 | /** |
1561 | * audit_syscall_entry - fill in an audit record at syscall entry | |
b0dd25a8 RD |
1562 | * @arch: architecture type |
1563 | * @major: major syscall type (function) | |
1564 | * @a1: additional syscall register 1 | |
1565 | * @a2: additional syscall register 2 | |
1566 | * @a3: additional syscall register 3 | |
1567 | * @a4: additional syscall register 4 | |
1568 | * | |
1569 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1570 | * audit context was created when the task was created and the state or |
1571 | * filters demand the audit context be built. If the state from the | |
1572 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1573 | * then the record will be written at syscall exit time (otherwise, it | |
1574 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1575 | * be written). |
1576 | */ | |
5411be59 | 1577 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1578 | unsigned long a1, unsigned long a2, |
1579 | unsigned long a3, unsigned long a4) | |
1580 | { | |
5411be59 | 1581 | struct task_struct *tsk = current; |
1da177e4 LT |
1582 | struct audit_context *context = tsk->audit_context; |
1583 | enum audit_state state; | |
1584 | ||
86a1c34a RM |
1585 | if (unlikely(!context)) |
1586 | return; | |
1da177e4 | 1587 | |
b0dd25a8 RD |
1588 | /* |
1589 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1590 | * calls in kernel_thread via the entry.S interface, instead of |
1591 | * with direct calls. (If you are porting to a new | |
1592 | * architecture, hitting this condition can indicate that you | |
1593 | * got the _exit/_leave calls backward in entry.S.) | |
1594 | * | |
1595 | * i386 no | |
1596 | * x86_64 no | |
2ef9481e | 1597 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1598 | * |
1599 | * This also happens with vm86 emulation in a non-nested manner | |
1600 | * (entries without exits), so this case must be caught. | |
1601 | */ | |
1602 | if (context->in_syscall) { | |
1603 | struct audit_context *newctx; | |
1604 | ||
1da177e4 LT |
1605 | #if AUDIT_DEBUG |
1606 | printk(KERN_ERR | |
1607 | "audit(:%d) pid=%d in syscall=%d;" | |
1608 | " entering syscall=%d\n", | |
1609 | context->serial, tsk->pid, context->major, major); | |
1610 | #endif | |
1611 | newctx = audit_alloc_context(context->state); | |
1612 | if (newctx) { | |
1613 | newctx->previous = context; | |
1614 | context = newctx; | |
1615 | tsk->audit_context = newctx; | |
1616 | } else { | |
1617 | /* If we can't alloc a new context, the best we | |
1618 | * can do is to leak memory (any pending putname | |
1619 | * will be lost). The only other alternative is | |
1620 | * to abandon auditing. */ | |
1621 | audit_zero_context(context, context->state); | |
1622 | } | |
1623 | } | |
1624 | BUG_ON(context->in_syscall || context->name_count); | |
1625 | ||
1626 | if (!audit_enabled) | |
1627 | return; | |
1628 | ||
2fd6f58b | 1629 | context->arch = arch; |
1da177e4 LT |
1630 | context->major = major; |
1631 | context->argv[0] = a1; | |
1632 | context->argv[1] = a2; | |
1633 | context->argv[2] = a3; | |
1634 | context->argv[3] = a4; | |
1635 | ||
1636 | state = context->state; | |
d51374ad AV |
1637 | context->dummy = !audit_n_rules; |
1638 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1639 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1640 | if (likely(state == AUDIT_DISABLED)) |
1641 | return; | |
1642 | ||
ce625a80 | 1643 | context->serial = 0; |
1da177e4 LT |
1644 | context->ctime = CURRENT_TIME; |
1645 | context->in_syscall = 1; | |
1646 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1647 | context->ppid = 0; |
1da177e4 LT |
1648 | } |
1649 | ||
a64e6494 AV |
1650 | void audit_finish_fork(struct task_struct *child) |
1651 | { | |
1652 | struct audit_context *ctx = current->audit_context; | |
1653 | struct audit_context *p = child->audit_context; | |
1654 | if (!p || !ctx || !ctx->auditable) | |
1655 | return; | |
1656 | p->arch = ctx->arch; | |
1657 | p->major = ctx->major; | |
1658 | memcpy(p->argv, ctx->argv, sizeof(ctx->argv)); | |
1659 | p->ctime = ctx->ctime; | |
1660 | p->dummy = ctx->dummy; | |
1661 | p->auditable = ctx->auditable; | |
1662 | p->in_syscall = ctx->in_syscall; | |
1663 | p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL); | |
1664 | p->ppid = current->pid; | |
1665 | } | |
1666 | ||
b0dd25a8 RD |
1667 | /** |
1668 | * audit_syscall_exit - deallocate audit context after a system call | |
b0dd25a8 RD |
1669 | * @valid: success/failure flag |
1670 | * @return_code: syscall return value | |
1671 | * | |
1672 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1673 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1674 | * filtering, or because some other part of the kernel write an audit | |
1675 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1676 | * free the names stored from getname(). |
1677 | */ | |
5411be59 | 1678 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1679 | { |
5411be59 | 1680 | struct task_struct *tsk = current; |
1da177e4 LT |
1681 | struct audit_context *context; |
1682 | ||
2fd6f58b | 1683 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1684 | |
1da177e4 | 1685 | if (likely(!context)) |
97e94c45 | 1686 | return; |
1da177e4 | 1687 | |
f7056d64 | 1688 | if (context->in_syscall && context->auditable) |
e495149b | 1689 | audit_log_exit(context, tsk); |
1da177e4 LT |
1690 | |
1691 | context->in_syscall = 0; | |
1692 | context->auditable = 0; | |
2fd6f58b | 1693 | |
1da177e4 LT |
1694 | if (context->previous) { |
1695 | struct audit_context *new_context = context->previous; | |
1696 | context->previous = NULL; | |
1697 | audit_free_context(context); | |
1698 | tsk->audit_context = new_context; | |
1699 | } else { | |
1700 | audit_free_names(context); | |
74c3cbe3 | 1701 | unroll_tree_refs(context, NULL, 0); |
1da177e4 | 1702 | audit_free_aux(context); |
e54dc243 AG |
1703 | context->aux = NULL; |
1704 | context->aux_pids = NULL; | |
a5cb013d | 1705 | context->target_pid = 0; |
e54dc243 | 1706 | context->target_sid = 0; |
4f6b434f | 1707 | context->sockaddr_len = 0; |
f3298dc4 | 1708 | context->type = 0; |
5adc8a6a AG |
1709 | kfree(context->filterkey); |
1710 | context->filterkey = NULL; | |
1da177e4 LT |
1711 | tsk->audit_context = context; |
1712 | } | |
1da177e4 LT |
1713 | } |
1714 | ||
74c3cbe3 AV |
1715 | static inline void handle_one(const struct inode *inode) |
1716 | { | |
1717 | #ifdef CONFIG_AUDIT_TREE | |
1718 | struct audit_context *context; | |
1719 | struct audit_tree_refs *p; | |
1720 | struct audit_chunk *chunk; | |
1721 | int count; | |
1722 | if (likely(list_empty(&inode->inotify_watches))) | |
1723 | return; | |
1724 | context = current->audit_context; | |
1725 | p = context->trees; | |
1726 | count = context->tree_count; | |
1727 | rcu_read_lock(); | |
1728 | chunk = audit_tree_lookup(inode); | |
1729 | rcu_read_unlock(); | |
1730 | if (!chunk) | |
1731 | return; | |
1732 | if (likely(put_tree_ref(context, chunk))) | |
1733 | return; | |
1734 | if (unlikely(!grow_tree_refs(context))) { | |
436c405c | 1735 | printk(KERN_WARNING "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1736 | audit_set_auditable(context); |
1737 | audit_put_chunk(chunk); | |
1738 | unroll_tree_refs(context, p, count); | |
1739 | return; | |
1740 | } | |
1741 | put_tree_ref(context, chunk); | |
1742 | #endif | |
1743 | } | |
1744 | ||
1745 | static void handle_path(const struct dentry *dentry) | |
1746 | { | |
1747 | #ifdef CONFIG_AUDIT_TREE | |
1748 | struct audit_context *context; | |
1749 | struct audit_tree_refs *p; | |
1750 | const struct dentry *d, *parent; | |
1751 | struct audit_chunk *drop; | |
1752 | unsigned long seq; | |
1753 | int count; | |
1754 | ||
1755 | context = current->audit_context; | |
1756 | p = context->trees; | |
1757 | count = context->tree_count; | |
1758 | retry: | |
1759 | drop = NULL; | |
1760 | d = dentry; | |
1761 | rcu_read_lock(); | |
1762 | seq = read_seqbegin(&rename_lock); | |
1763 | for(;;) { | |
1764 | struct inode *inode = d->d_inode; | |
1765 | if (inode && unlikely(!list_empty(&inode->inotify_watches))) { | |
1766 | struct audit_chunk *chunk; | |
1767 | chunk = audit_tree_lookup(inode); | |
1768 | if (chunk) { | |
1769 | if (unlikely(!put_tree_ref(context, chunk))) { | |
1770 | drop = chunk; | |
1771 | break; | |
1772 | } | |
1773 | } | |
1774 | } | |
1775 | parent = d->d_parent; | |
1776 | if (parent == d) | |
1777 | break; | |
1778 | d = parent; | |
1779 | } | |
1780 | if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */ | |
1781 | rcu_read_unlock(); | |
1782 | if (!drop) { | |
1783 | /* just a race with rename */ | |
1784 | unroll_tree_refs(context, p, count); | |
1785 | goto retry; | |
1786 | } | |
1787 | audit_put_chunk(drop); | |
1788 | if (grow_tree_refs(context)) { | |
1789 | /* OK, got more space */ | |
1790 | unroll_tree_refs(context, p, count); | |
1791 | goto retry; | |
1792 | } | |
1793 | /* too bad */ | |
1794 | printk(KERN_WARNING | |
436c405c | 1795 | "out of memory, audit has lost a tree reference\n"); |
74c3cbe3 AV |
1796 | unroll_tree_refs(context, p, count); |
1797 | audit_set_auditable(context); | |
1798 | return; | |
1799 | } | |
1800 | rcu_read_unlock(); | |
1801 | #endif | |
1802 | } | |
1803 | ||
b0dd25a8 RD |
1804 | /** |
1805 | * audit_getname - add a name to the list | |
1806 | * @name: name to add | |
1807 | * | |
1808 | * Add a name to the list of audit names for this context. | |
1809 | * Called from fs/namei.c:getname(). | |
1810 | */ | |
d8945bb5 | 1811 | void __audit_getname(const char *name) |
1da177e4 LT |
1812 | { |
1813 | struct audit_context *context = current->audit_context; | |
1814 | ||
d8945bb5 | 1815 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1816 | return; |
1817 | ||
1818 | if (!context->in_syscall) { | |
1819 | #if AUDIT_DEBUG == 2 | |
1820 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1821 | __FILE__, __LINE__, context->serial, name); | |
1822 | dump_stack(); | |
1823 | #endif | |
1824 | return; | |
1825 | } | |
1826 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1827 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1828 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1829 | context->names[context->name_count].name_put = 1; | |
1da177e4 | 1830 | context->names[context->name_count].ino = (unsigned long)-1; |
e41e8bde | 1831 | context->names[context->name_count].osid = 0; |
1da177e4 | 1832 | ++context->name_count; |
44707fdf | 1833 | if (!context->pwd.dentry) { |
8f37d47c | 1834 | read_lock(¤t->fs->lock); |
44707fdf JB |
1835 | context->pwd = current->fs->pwd; |
1836 | path_get(¤t->fs->pwd); | |
8f37d47c DW |
1837 | read_unlock(¤t->fs->lock); |
1838 | } | |
9f8dbe9c | 1839 | |
1da177e4 LT |
1840 | } |
1841 | ||
b0dd25a8 RD |
1842 | /* audit_putname - intercept a putname request |
1843 | * @name: name to intercept and delay for putname | |
1844 | * | |
1845 | * If we have stored the name from getname in the audit context, | |
1846 | * then we delay the putname until syscall exit. | |
1847 | * Called from include/linux/fs.h:putname(). | |
1848 | */ | |
1da177e4 LT |
1849 | void audit_putname(const char *name) |
1850 | { | |
1851 | struct audit_context *context = current->audit_context; | |
1852 | ||
1853 | BUG_ON(!context); | |
1854 | if (!context->in_syscall) { | |
1855 | #if AUDIT_DEBUG == 2 | |
1856 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1857 | __FILE__, __LINE__, context->serial, name); | |
1858 | if (context->name_count) { | |
1859 | int i; | |
1860 | for (i = 0; i < context->name_count; i++) | |
1861 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1862 | context->names[i].name, | |
73241ccc | 1863 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1864 | } |
1865 | #endif | |
1866 | __putname(name); | |
1867 | } | |
1868 | #if AUDIT_DEBUG | |
1869 | else { | |
1870 | ++context->put_count; | |
1871 | if (context->put_count > context->name_count) { | |
1872 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1873 | " in_syscall=%d putname(%p) name_count=%d" | |
1874 | " put_count=%d\n", | |
1875 | __FILE__, __LINE__, | |
1876 | context->serial, context->major, | |
1877 | context->in_syscall, name, context->name_count, | |
1878 | context->put_count); | |
1879 | dump_stack(); | |
1880 | } | |
1881 | } | |
1882 | #endif | |
1883 | } | |
1884 | ||
5712e88f AG |
1885 | static int audit_inc_name_count(struct audit_context *context, |
1886 | const struct inode *inode) | |
1887 | { | |
1888 | if (context->name_count >= AUDIT_NAMES) { | |
1889 | if (inode) | |
1890 | printk(KERN_DEBUG "name_count maxed, losing inode data: " | |
436c405c | 1891 | "dev=%02x:%02x, inode=%lu\n", |
5712e88f AG |
1892 | MAJOR(inode->i_sb->s_dev), |
1893 | MINOR(inode->i_sb->s_dev), | |
1894 | inode->i_ino); | |
1895 | ||
1896 | else | |
436c405c | 1897 | printk(KERN_DEBUG "name_count maxed, losing inode data\n"); |
5712e88f AG |
1898 | return 1; |
1899 | } | |
1900 | context->name_count++; | |
1901 | #if AUDIT_DEBUG | |
1902 | context->ino_count++; | |
1903 | #endif | |
1904 | return 0; | |
1905 | } | |
1906 | ||
851f7ff5 EP |
1907 | |
1908 | static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) | |
1909 | { | |
1910 | struct cpu_vfs_cap_data caps; | |
1911 | int rc; | |
1912 | ||
1913 | memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t)); | |
1914 | memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t)); | |
1915 | name->fcap.fE = 0; | |
1916 | name->fcap_ver = 0; | |
1917 | ||
1918 | if (!dentry) | |
1919 | return 0; | |
1920 | ||
1921 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
1922 | if (rc) | |
1923 | return rc; | |
1924 | ||
1925 | name->fcap.permitted = caps.permitted; | |
1926 | name->fcap.inheritable = caps.inheritable; | |
1927 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
1928 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
1929 | ||
1930 | return 0; | |
1931 | } | |
1932 | ||
1933 | ||
3e2efce0 | 1934 | /* Copy inode data into an audit_names. */ |
851f7ff5 EP |
1935 | static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
1936 | const struct inode *inode) | |
8c8570fb | 1937 | { |
3e2efce0 AG |
1938 | name->ino = inode->i_ino; |
1939 | name->dev = inode->i_sb->s_dev; | |
1940 | name->mode = inode->i_mode; | |
1941 | name->uid = inode->i_uid; | |
1942 | name->gid = inode->i_gid; | |
1943 | name->rdev = inode->i_rdev; | |
2a862b32 | 1944 | security_inode_getsecid(inode, &name->osid); |
851f7ff5 | 1945 | audit_copy_fcaps(name, dentry); |
8c8570fb DK |
1946 | } |
1947 | ||
b0dd25a8 RD |
1948 | /** |
1949 | * audit_inode - store the inode and device from a lookup | |
1950 | * @name: name being audited | |
481968f4 | 1951 | * @dentry: dentry being audited |
b0dd25a8 RD |
1952 | * |
1953 | * Called from fs/namei.c:path_lookup(). | |
1954 | */ | |
5a190ae6 | 1955 | void __audit_inode(const char *name, const struct dentry *dentry) |
1da177e4 LT |
1956 | { |
1957 | int idx; | |
1958 | struct audit_context *context = current->audit_context; | |
74c3cbe3 | 1959 | const struct inode *inode = dentry->d_inode; |
1da177e4 LT |
1960 | |
1961 | if (!context->in_syscall) | |
1962 | return; | |
1963 | if (context->name_count | |
1964 | && context->names[context->name_count-1].name | |
1965 | && context->names[context->name_count-1].name == name) | |
1966 | idx = context->name_count - 1; | |
1967 | else if (context->name_count > 1 | |
1968 | && context->names[context->name_count-2].name | |
1969 | && context->names[context->name_count-2].name == name) | |
1970 | idx = context->name_count - 2; | |
1971 | else { | |
1972 | /* FIXME: how much do we care about inodes that have no | |
1973 | * associated name? */ | |
5712e88f | 1974 | if (audit_inc_name_count(context, inode)) |
1da177e4 | 1975 | return; |
5712e88f | 1976 | idx = context->name_count - 1; |
1da177e4 | 1977 | context->names[idx].name = NULL; |
1da177e4 | 1978 | } |
74c3cbe3 | 1979 | handle_path(dentry); |
851f7ff5 | 1980 | audit_copy_inode(&context->names[idx], dentry, inode); |
73241ccc AG |
1981 | } |
1982 | ||
1983 | /** | |
1984 | * audit_inode_child - collect inode info for created/removed objects | |
1985 | * @dname: inode's dentry name | |
481968f4 | 1986 | * @dentry: dentry being audited |
73d3ec5a | 1987 | * @parent: inode of dentry parent |
73241ccc AG |
1988 | * |
1989 | * For syscalls that create or remove filesystem objects, audit_inode | |
1990 | * can only collect information for the filesystem object's parent. | |
1991 | * This call updates the audit context with the child's information. | |
1992 | * Syscalls that create a new filesystem object must be hooked after | |
1993 | * the object is created. Syscalls that remove a filesystem object | |
1994 | * must be hooked prior, in order to capture the target inode during | |
1995 | * unsuccessful attempts. | |
1996 | */ | |
5a190ae6 | 1997 | void __audit_inode_child(const char *dname, const struct dentry *dentry, |
73d3ec5a | 1998 | const struct inode *parent) |
73241ccc AG |
1999 | { |
2000 | int idx; | |
2001 | struct audit_context *context = current->audit_context; | |
5712e88f | 2002 | const char *found_parent = NULL, *found_child = NULL; |
5a190ae6 | 2003 | const struct inode *inode = dentry->d_inode; |
9c937dcc | 2004 | int dirlen = 0; |
73241ccc AG |
2005 | |
2006 | if (!context->in_syscall) | |
2007 | return; | |
2008 | ||
74c3cbe3 AV |
2009 | if (inode) |
2010 | handle_one(inode); | |
73241ccc | 2011 | /* determine matching parent */ |
f368c07d | 2012 | if (!dname) |
5712e88f | 2013 | goto add_names; |
73241ccc | 2014 | |
5712e88f AG |
2015 | /* parent is more likely, look for it first */ |
2016 | for (idx = 0; idx < context->name_count; idx++) { | |
2017 | struct audit_names *n = &context->names[idx]; | |
f368c07d | 2018 | |
5712e88f AG |
2019 | if (!n->name) |
2020 | continue; | |
2021 | ||
2022 | if (n->ino == parent->i_ino && | |
2023 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2024 | n->name_len = dirlen; /* update parent data in place */ | |
2025 | found_parent = n->name; | |
2026 | goto add_names; | |
f368c07d | 2027 | } |
5712e88f | 2028 | } |
73241ccc | 2029 | |
5712e88f AG |
2030 | /* no matching parent, look for matching child */ |
2031 | for (idx = 0; idx < context->name_count; idx++) { | |
2032 | struct audit_names *n = &context->names[idx]; | |
2033 | ||
2034 | if (!n->name) | |
2035 | continue; | |
2036 | ||
2037 | /* strcmp() is the more likely scenario */ | |
2038 | if (!strcmp(dname, n->name) || | |
2039 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
2040 | if (inode) | |
851f7ff5 | 2041 | audit_copy_inode(n, NULL, inode); |
5712e88f AG |
2042 | else |
2043 | n->ino = (unsigned long)-1; | |
2044 | found_child = n->name; | |
2045 | goto add_names; | |
2046 | } | |
ac9910ce | 2047 | } |
5712e88f AG |
2048 | |
2049 | add_names: | |
2050 | if (!found_parent) { | |
2051 | if (audit_inc_name_count(context, parent)) | |
ac9910ce | 2052 | return; |
5712e88f AG |
2053 | idx = context->name_count - 1; |
2054 | context->names[idx].name = NULL; | |
851f7ff5 | 2055 | audit_copy_inode(&context->names[idx], NULL, parent); |
73d3ec5a | 2056 | } |
5712e88f AG |
2057 | |
2058 | if (!found_child) { | |
2059 | if (audit_inc_name_count(context, inode)) | |
2060 | return; | |
2061 | idx = context->name_count - 1; | |
2062 | ||
2063 | /* Re-use the name belonging to the slot for a matching parent | |
2064 | * directory. All names for this context are relinquished in | |
2065 | * audit_free_names() */ | |
2066 | if (found_parent) { | |
2067 | context->names[idx].name = found_parent; | |
2068 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
2069 | /* don't call __putname() */ | |
2070 | context->names[idx].name_put = 0; | |
2071 | } else { | |
2072 | context->names[idx].name = NULL; | |
2073 | } | |
2074 | ||
2075 | if (inode) | |
851f7ff5 | 2076 | audit_copy_inode(&context->names[idx], NULL, inode); |
5712e88f AG |
2077 | else |
2078 | context->names[idx].ino = (unsigned long)-1; | |
2079 | } | |
3e2efce0 | 2080 | } |
50e437d5 | 2081 | EXPORT_SYMBOL_GPL(__audit_inode_child); |
3e2efce0 | 2082 | |
b0dd25a8 RD |
2083 | /** |
2084 | * auditsc_get_stamp - get local copies of audit_context values | |
2085 | * @ctx: audit_context for the task | |
2086 | * @t: timespec to store time recorded in the audit_context | |
2087 | * @serial: serial value that is recorded in the audit_context | |
2088 | * | |
2089 | * Also sets the context as auditable. | |
2090 | */ | |
48887e63 | 2091 | int auditsc_get_stamp(struct audit_context *ctx, |
bfb4496e | 2092 | struct timespec *t, unsigned int *serial) |
1da177e4 | 2093 | { |
48887e63 AV |
2094 | if (!ctx->in_syscall) |
2095 | return 0; | |
ce625a80 DW |
2096 | if (!ctx->serial) |
2097 | ctx->serial = audit_serial(); | |
bfb4496e DW |
2098 | t->tv_sec = ctx->ctime.tv_sec; |
2099 | t->tv_nsec = ctx->ctime.tv_nsec; | |
2100 | *serial = ctx->serial; | |
2101 | ctx->auditable = 1; | |
48887e63 | 2102 | return 1; |
1da177e4 LT |
2103 | } |
2104 | ||
4746ec5b EP |
2105 | /* global counter which is incremented every time something logs in */ |
2106 | static atomic_t session_id = ATOMIC_INIT(0); | |
2107 | ||
b0dd25a8 RD |
2108 | /** |
2109 | * audit_set_loginuid - set a task's audit_context loginuid | |
2110 | * @task: task whose audit context is being modified | |
2111 | * @loginuid: loginuid value | |
2112 | * | |
2113 | * Returns 0. | |
2114 | * | |
2115 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
2116 | */ | |
456be6cd | 2117 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 2118 | { |
4746ec5b | 2119 | unsigned int sessionid = atomic_inc_return(&session_id); |
41757106 SG |
2120 | struct audit_context *context = task->audit_context; |
2121 | ||
bfef93a5 AV |
2122 | if (context && context->in_syscall) { |
2123 | struct audit_buffer *ab; | |
2124 | ||
2125 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
2126 | if (ab) { | |
2127 | audit_log_format(ab, "login pid=%d uid=%u " | |
4746ec5b EP |
2128 | "old auid=%u new auid=%u" |
2129 | " old ses=%u new ses=%u", | |
c69e8d9c | 2130 | task->pid, task_uid(task), |
4746ec5b EP |
2131 | task->loginuid, loginuid, |
2132 | task->sessionid, sessionid); | |
bfef93a5 | 2133 | audit_log_end(ab); |
c0404993 | 2134 | } |
1da177e4 | 2135 | } |
4746ec5b | 2136 | task->sessionid = sessionid; |
bfef93a5 | 2137 | task->loginuid = loginuid; |
1da177e4 LT |
2138 | return 0; |
2139 | } | |
2140 | ||
20ca73bc GW |
2141 | /** |
2142 | * __audit_mq_open - record audit data for a POSIX MQ open | |
2143 | * @oflag: open flag | |
2144 | * @mode: mode bits | |
2145 | * @u_attr: queue attributes | |
2146 | * | |
2147 | * Returns 0 for success or NULL context or < 0 on error. | |
2148 | */ | |
2149 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
2150 | { | |
2151 | struct audit_aux_data_mq_open *ax; | |
2152 | struct audit_context *context = current->audit_context; | |
2153 | ||
2154 | if (!audit_enabled) | |
2155 | return 0; | |
2156 | ||
2157 | if (likely(!context)) | |
2158 | return 0; | |
2159 | ||
2160 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
2161 | if (!ax) | |
2162 | return -ENOMEM; | |
2163 | ||
2164 | if (u_attr != NULL) { | |
2165 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
2166 | kfree(ax); | |
2167 | return -EFAULT; | |
2168 | } | |
2169 | } else | |
2170 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
2171 | ||
2172 | ax->oflag = oflag; | |
2173 | ax->mode = mode; | |
2174 | ||
2175 | ax->d.type = AUDIT_MQ_OPEN; | |
2176 | ax->d.next = context->aux; | |
2177 | context->aux = (void *)ax; | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | /** | |
2182 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
2183 | * @mqdes: MQ descriptor | |
2184 | * @msg_len: Message length | |
2185 | * @msg_prio: Message priority | |
1dbe83c3 | 2186 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
2187 | * |
2188 | * Returns 0 for success or NULL context or < 0 on error. | |
2189 | */ | |
2190 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
2191 | const struct timespec __user *u_abs_timeout) | |
2192 | { | |
2193 | struct audit_aux_data_mq_sendrecv *ax; | |
2194 | struct audit_context *context = current->audit_context; | |
2195 | ||
2196 | if (!audit_enabled) | |
2197 | return 0; | |
2198 | ||
2199 | if (likely(!context)) | |
2200 | return 0; | |
2201 | ||
2202 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
2203 | if (!ax) | |
2204 | return -ENOMEM; | |
2205 | ||
2206 | if (u_abs_timeout != NULL) { | |
2207 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
2208 | kfree(ax); | |
2209 | return -EFAULT; | |
2210 | } | |
2211 | } else | |
2212 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
2213 | ||
2214 | ax->mqdes = mqdes; | |
2215 | ax->msg_len = msg_len; | |
2216 | ax->msg_prio = msg_prio; | |
2217 | ||
2218 | ax->d.type = AUDIT_MQ_SENDRECV; | |
2219 | ax->d.next = context->aux; | |
2220 | context->aux = (void *)ax; | |
2221 | return 0; | |
2222 | } | |
2223 | ||
2224 | /** | |
2225 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
2226 | * @mqdes: MQ descriptor | |
2227 | * @msg_len: Message length | |
1dbe83c3 RD |
2228 | * @u_msg_prio: Message priority |
2229 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
2230 | * |
2231 | * Returns 0 for success or NULL context or < 0 on error. | |
2232 | */ | |
2233 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
2234 | unsigned int __user *u_msg_prio, | |
2235 | const struct timespec __user *u_abs_timeout) | |
2236 | { | |
2237 | struct audit_aux_data_mq_sendrecv *ax; | |
2238 | struct audit_context *context = current->audit_context; | |
2239 | ||
2240 | if (!audit_enabled) | |
2241 | return 0; | |
2242 | ||
2243 | if (likely(!context)) | |
2244 | return 0; | |
2245 | ||
2246 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
2247 | if (!ax) | |
2248 | return -ENOMEM; | |
2249 | ||
2250 | if (u_msg_prio != NULL) { | |
2251 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
2252 | kfree(ax); | |
2253 | return -EFAULT; | |
2254 | } | |
2255 | } else | |
2256 | ax->msg_prio = 0; | |
2257 | ||
2258 | if (u_abs_timeout != NULL) { | |
2259 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
2260 | kfree(ax); | |
2261 | return -EFAULT; | |
2262 | } | |
2263 | } else | |
2264 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
2265 | ||
2266 | ax->mqdes = mqdes; | |
2267 | ax->msg_len = msg_len; | |
2268 | ||
2269 | ax->d.type = AUDIT_MQ_SENDRECV; | |
2270 | ax->d.next = context->aux; | |
2271 | context->aux = (void *)ax; | |
2272 | return 0; | |
2273 | } | |
2274 | ||
2275 | /** | |
2276 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
2277 | * @mqdes: MQ descriptor | |
2278 | * @u_notification: Notification event | |
2279 | * | |
2280 | * Returns 0 for success or NULL context or < 0 on error. | |
2281 | */ | |
2282 | ||
2283 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
2284 | { | |
2285 | struct audit_aux_data_mq_notify *ax; | |
2286 | struct audit_context *context = current->audit_context; | |
2287 | ||
2288 | if (!audit_enabled) | |
2289 | return 0; | |
2290 | ||
2291 | if (likely(!context)) | |
2292 | return 0; | |
2293 | ||
2294 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
2295 | if (!ax) | |
2296 | return -ENOMEM; | |
2297 | ||
2298 | if (u_notification != NULL) { | |
2299 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
2300 | kfree(ax); | |
2301 | return -EFAULT; | |
2302 | } | |
2303 | } else | |
2304 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
2305 | ||
2306 | ax->mqdes = mqdes; | |
2307 | ||
2308 | ax->d.type = AUDIT_MQ_NOTIFY; | |
2309 | ax->d.next = context->aux; | |
2310 | context->aux = (void *)ax; | |
2311 | return 0; | |
2312 | } | |
2313 | ||
2314 | /** | |
2315 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
2316 | * @mqdes: MQ descriptor | |
2317 | * @mqstat: MQ flags | |
2318 | * | |
2319 | * Returns 0 for success or NULL context or < 0 on error. | |
2320 | */ | |
2321 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
2322 | { | |
2323 | struct audit_aux_data_mq_getsetattr *ax; | |
2324 | struct audit_context *context = current->audit_context; | |
2325 | ||
2326 | if (!audit_enabled) | |
2327 | return 0; | |
2328 | ||
2329 | if (likely(!context)) | |
2330 | return 0; | |
2331 | ||
2332 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
2333 | if (!ax) | |
2334 | return -ENOMEM; | |
2335 | ||
2336 | ax->mqdes = mqdes; | |
2337 | ax->mqstat = *mqstat; | |
2338 | ||
2339 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
2340 | ax->d.next = context->aux; | |
2341 | context->aux = (void *)ax; | |
2342 | return 0; | |
2343 | } | |
2344 | ||
b0dd25a8 | 2345 | /** |
073115d6 SG |
2346 | * audit_ipc_obj - record audit data for ipc object |
2347 | * @ipcp: ipc permissions | |
2348 | * | |
073115d6 | 2349 | */ |
a33e6751 | 2350 | void __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 | 2351 | { |
073115d6 | 2352 | struct audit_context *context = current->audit_context; |
a33e6751 AV |
2353 | context->ipc.uid = ipcp->uid; |
2354 | context->ipc.gid = ipcp->gid; | |
2355 | context->ipc.mode = ipcp->mode; | |
e816f370 | 2356 | context->ipc.has_perm = 0; |
a33e6751 AV |
2357 | security_ipc_getsecid(ipcp, &context->ipc.osid); |
2358 | context->type = AUDIT_IPC; | |
073115d6 SG |
2359 | } |
2360 | ||
2361 | /** | |
2362 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
2363 | * @qbytes: msgq bytes |
2364 | * @uid: msgq user id | |
2365 | * @gid: msgq group id | |
2366 | * @mode: msgq mode (permissions) | |
2367 | * | |
e816f370 | 2368 | * Called only after audit_ipc_obj(). |
b0dd25a8 | 2369 | */ |
e816f370 | 2370 | void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 | 2371 | { |
1da177e4 LT |
2372 | struct audit_context *context = current->audit_context; |
2373 | ||
e816f370 AV |
2374 | context->ipc.qbytes = qbytes; |
2375 | context->ipc.perm_uid = uid; | |
2376 | context->ipc.perm_gid = gid; | |
2377 | context->ipc.perm_mode = mode; | |
2378 | context->ipc.has_perm = 1; | |
1da177e4 | 2379 | } |
c2f0c7c3 | 2380 | |
473ae30b AV |
2381 | int audit_bprm(struct linux_binprm *bprm) |
2382 | { | |
2383 | struct audit_aux_data_execve *ax; | |
2384 | struct audit_context *context = current->audit_context; | |
473ae30b | 2385 | |
5ac3a9c2 | 2386 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
2387 | return 0; |
2388 | ||
bdf4c48a | 2389 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); |
473ae30b AV |
2390 | if (!ax) |
2391 | return -ENOMEM; | |
2392 | ||
2393 | ax->argc = bprm->argc; | |
2394 | ax->envc = bprm->envc; | |
bdf4c48a | 2395 | ax->mm = bprm->mm; |
473ae30b AV |
2396 | ax->d.type = AUDIT_EXECVE; |
2397 | ax->d.next = context->aux; | |
2398 | context->aux = (void *)ax; | |
2399 | return 0; | |
2400 | } | |
2401 | ||
2402 | ||
b0dd25a8 RD |
2403 | /** |
2404 | * audit_socketcall - record audit data for sys_socketcall | |
2405 | * @nargs: number of args | |
2406 | * @args: args array | |
2407 | * | |
b0dd25a8 | 2408 | */ |
f3298dc4 | 2409 | void audit_socketcall(int nargs, unsigned long *args) |
3ec3b2fb | 2410 | { |
3ec3b2fb DW |
2411 | struct audit_context *context = current->audit_context; |
2412 | ||
5ac3a9c2 | 2413 | if (likely(!context || context->dummy)) |
f3298dc4 | 2414 | return; |
3ec3b2fb | 2415 | |
f3298dc4 AV |
2416 | context->type = AUDIT_SOCKETCALL; |
2417 | context->socketcall.nargs = nargs; | |
2418 | memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long)); | |
3ec3b2fb DW |
2419 | } |
2420 | ||
db349509 AV |
2421 | /** |
2422 | * __audit_fd_pair - record audit data for pipe and socketpair | |
2423 | * @fd1: the first file descriptor | |
2424 | * @fd2: the second file descriptor | |
2425 | * | |
2426 | * Returns 0 for success or NULL context or < 0 on error. | |
2427 | */ | |
2428 | int __audit_fd_pair(int fd1, int fd2) | |
2429 | { | |
2430 | struct audit_context *context = current->audit_context; | |
2431 | struct audit_aux_data_fd_pair *ax; | |
2432 | ||
2433 | if (likely(!context)) { | |
2434 | return 0; | |
2435 | } | |
2436 | ||
2437 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2438 | if (!ax) { | |
2439 | return -ENOMEM; | |
2440 | } | |
2441 | ||
2442 | ax->fd[0] = fd1; | |
2443 | ax->fd[1] = fd2; | |
2444 | ||
2445 | ax->d.type = AUDIT_FD_PAIR; | |
2446 | ax->d.next = context->aux; | |
2447 | context->aux = (void *)ax; | |
2448 | return 0; | |
2449 | } | |
2450 | ||
b0dd25a8 RD |
2451 | /** |
2452 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
2453 | * @len: data length in user space | |
2454 | * @a: data address in kernel space | |
2455 | * | |
2456 | * Returns 0 for success or NULL context or < 0 on error. | |
2457 | */ | |
3ec3b2fb DW |
2458 | int audit_sockaddr(int len, void *a) |
2459 | { | |
3ec3b2fb DW |
2460 | struct audit_context *context = current->audit_context; |
2461 | ||
5ac3a9c2 | 2462 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
2463 | return 0; |
2464 | ||
4f6b434f AV |
2465 | if (!context->sockaddr) { |
2466 | void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL); | |
2467 | if (!p) | |
2468 | return -ENOMEM; | |
2469 | context->sockaddr = p; | |
2470 | } | |
3ec3b2fb | 2471 | |
4f6b434f AV |
2472 | context->sockaddr_len = len; |
2473 | memcpy(context->sockaddr, a, len); | |
3ec3b2fb DW |
2474 | return 0; |
2475 | } | |
2476 | ||
a5cb013d AV |
2477 | void __audit_ptrace(struct task_struct *t) |
2478 | { | |
2479 | struct audit_context *context = current->audit_context; | |
2480 | ||
2481 | context->target_pid = t->pid; | |
c2a7780e | 2482 | context->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2483 | context->target_uid = task_uid(t); |
4746ec5b | 2484 | context->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2485 | security_task_getsecid(t, &context->target_sid); |
c2a7780e | 2486 | memcpy(context->target_comm, t->comm, TASK_COMM_LEN); |
a5cb013d AV |
2487 | } |
2488 | ||
b0dd25a8 RD |
2489 | /** |
2490 | * audit_signal_info - record signal info for shutting down audit subsystem | |
2491 | * @sig: signal value | |
2492 | * @t: task being signaled | |
2493 | * | |
2494 | * If the audit subsystem is being terminated, record the task (pid) | |
2495 | * and uid that is doing that. | |
2496 | */ | |
e54dc243 | 2497 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 2498 | { |
e54dc243 AG |
2499 | struct audit_aux_data_pids *axp; |
2500 | struct task_struct *tsk = current; | |
2501 | struct audit_context *ctx = tsk->audit_context; | |
c69e8d9c | 2502 | uid_t uid = current_uid(), t_uid = task_uid(t); |
e1396065 | 2503 | |
175fc484 | 2504 | if (audit_pid && t->tgid == audit_pid) { |
ee1d3156 | 2505 | if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { |
175fc484 | 2506 | audit_sig_pid = tsk->pid; |
bfef93a5 AV |
2507 | if (tsk->loginuid != -1) |
2508 | audit_sig_uid = tsk->loginuid; | |
175fc484 | 2509 | else |
c69e8d9c | 2510 | audit_sig_uid = uid; |
2a862b32 | 2511 | security_task_getsecid(tsk, &audit_sig_sid); |
175fc484 AV |
2512 | } |
2513 | if (!audit_signals || audit_dummy_context()) | |
2514 | return 0; | |
c2f0c7c3 | 2515 | } |
e54dc243 | 2516 | |
e54dc243 AG |
2517 | /* optimize the common case by putting first signal recipient directly |
2518 | * in audit_context */ | |
2519 | if (!ctx->target_pid) { | |
2520 | ctx->target_pid = t->tgid; | |
c2a7780e | 2521 | ctx->target_auid = audit_get_loginuid(t); |
c69e8d9c | 2522 | ctx->target_uid = t_uid; |
4746ec5b | 2523 | ctx->target_sessionid = audit_get_sessionid(t); |
2a862b32 | 2524 | security_task_getsecid(t, &ctx->target_sid); |
c2a7780e | 2525 | memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2526 | return 0; |
2527 | } | |
2528 | ||
2529 | axp = (void *)ctx->aux_pids; | |
2530 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2531 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2532 | if (!axp) | |
2533 | return -ENOMEM; | |
2534 | ||
2535 | axp->d.type = AUDIT_OBJ_PID; | |
2536 | axp->d.next = ctx->aux_pids; | |
2537 | ctx->aux_pids = (void *)axp; | |
2538 | } | |
88ae704c | 2539 | BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS); |
e54dc243 AG |
2540 | |
2541 | axp->target_pid[axp->pid_count] = t->tgid; | |
c2a7780e | 2542 | axp->target_auid[axp->pid_count] = audit_get_loginuid(t); |
c69e8d9c | 2543 | axp->target_uid[axp->pid_count] = t_uid; |
4746ec5b | 2544 | axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); |
2a862b32 | 2545 | security_task_getsecid(t, &axp->target_sid[axp->pid_count]); |
c2a7780e | 2546 | memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); |
e54dc243 AG |
2547 | axp->pid_count++; |
2548 | ||
2549 | return 0; | |
c2f0c7c3 | 2550 | } |
0a4ff8c2 | 2551 | |
3fc689e9 EP |
2552 | /** |
2553 | * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps | |
d84f4f99 DH |
2554 | * @bprm: pointer to the bprm being processed |
2555 | * @new: the proposed new credentials | |
2556 | * @old: the old credentials | |
3fc689e9 EP |
2557 | * |
2558 | * Simply check if the proc already has the caps given by the file and if not | |
2559 | * store the priv escalation info for later auditing at the end of the syscall | |
2560 | * | |
3fc689e9 EP |
2561 | * -Eric |
2562 | */ | |
d84f4f99 DH |
2563 | int __audit_log_bprm_fcaps(struct linux_binprm *bprm, |
2564 | const struct cred *new, const struct cred *old) | |
3fc689e9 EP |
2565 | { |
2566 | struct audit_aux_data_bprm_fcaps *ax; | |
2567 | struct audit_context *context = current->audit_context; | |
2568 | struct cpu_vfs_cap_data vcaps; | |
2569 | struct dentry *dentry; | |
2570 | ||
2571 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2572 | if (!ax) | |
d84f4f99 | 2573 | return -ENOMEM; |
3fc689e9 EP |
2574 | |
2575 | ax->d.type = AUDIT_BPRM_FCAPS; | |
2576 | ax->d.next = context->aux; | |
2577 | context->aux = (void *)ax; | |
2578 | ||
2579 | dentry = dget(bprm->file->f_dentry); | |
2580 | get_vfs_caps_from_disk(dentry, &vcaps); | |
2581 | dput(dentry); | |
2582 | ||
2583 | ax->fcap.permitted = vcaps.permitted; | |
2584 | ax->fcap.inheritable = vcaps.inheritable; | |
2585 | ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
2586 | ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; | |
2587 | ||
d84f4f99 DH |
2588 | ax->old_pcap.permitted = old->cap_permitted; |
2589 | ax->old_pcap.inheritable = old->cap_inheritable; | |
2590 | ax->old_pcap.effective = old->cap_effective; | |
3fc689e9 | 2591 | |
d84f4f99 DH |
2592 | ax->new_pcap.permitted = new->cap_permitted; |
2593 | ax->new_pcap.inheritable = new->cap_inheritable; | |
2594 | ax->new_pcap.effective = new->cap_effective; | |
2595 | return 0; | |
3fc689e9 EP |
2596 | } |
2597 | ||
e68b75a0 EP |
2598 | /** |
2599 | * __audit_log_capset - store information about the arguments to the capset syscall | |
d84f4f99 DH |
2600 | * @pid: target pid of the capset call |
2601 | * @new: the new credentials | |
2602 | * @old: the old (current) credentials | |
e68b75a0 EP |
2603 | * |
2604 | * Record the aguments userspace sent to sys_capset for later printing by the | |
2605 | * audit system if applicable | |
2606 | */ | |
d84f4f99 DH |
2607 | int __audit_log_capset(pid_t pid, |
2608 | const struct cred *new, const struct cred *old) | |
e68b75a0 EP |
2609 | { |
2610 | struct audit_aux_data_capset *ax; | |
2611 | struct audit_context *context = current->audit_context; | |
2612 | ||
2613 | if (likely(!audit_enabled || !context || context->dummy)) | |
2614 | return 0; | |
2615 | ||
2616 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
2617 | if (!ax) | |
2618 | return -ENOMEM; | |
2619 | ||
2620 | ax->d.type = AUDIT_CAPSET; | |
2621 | ax->d.next = context->aux; | |
2622 | context->aux = (void *)ax; | |
2623 | ||
2624 | ax->pid = pid; | |
d84f4f99 DH |
2625 | ax->cap.effective = new->cap_effective; |
2626 | ax->cap.inheritable = new->cap_effective; | |
2627 | ax->cap.permitted = new->cap_permitted; | |
e68b75a0 EP |
2628 | |
2629 | return 0; | |
2630 | } | |
2631 | ||
0a4ff8c2 SG |
2632 | /** |
2633 | * audit_core_dumps - record information about processes that end abnormally | |
6d9525b5 | 2634 | * @signr: signal value |
0a4ff8c2 SG |
2635 | * |
2636 | * If a process ends with a core dump, something fishy is going on and we | |
2637 | * should record the event for investigation. | |
2638 | */ | |
2639 | void audit_core_dumps(long signr) | |
2640 | { | |
2641 | struct audit_buffer *ab; | |
2642 | u32 sid; | |
76aac0e9 DH |
2643 | uid_t auid = audit_get_loginuid(current), uid; |
2644 | gid_t gid; | |
4746ec5b | 2645 | unsigned int sessionid = audit_get_sessionid(current); |
0a4ff8c2 SG |
2646 | |
2647 | if (!audit_enabled) | |
2648 | return; | |
2649 | ||
2650 | if (signr == SIGQUIT) /* don't care for those */ | |
2651 | return; | |
2652 | ||
2653 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
76aac0e9 | 2654 | current_uid_gid(&uid, &gid); |
4746ec5b | 2655 | audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", |
76aac0e9 | 2656 | auid, uid, gid, sessionid); |
2a862b32 | 2657 | security_task_getsecid(current, &sid); |
0a4ff8c2 SG |
2658 | if (sid) { |
2659 | char *ctx = NULL; | |
2660 | u32 len; | |
2661 | ||
2a862b32 | 2662 | if (security_secid_to_secctx(sid, &ctx, &len)) |
0a4ff8c2 | 2663 | audit_log_format(ab, " ssid=%u", sid); |
2a862b32 | 2664 | else { |
0a4ff8c2 | 2665 | audit_log_format(ab, " subj=%s", ctx); |
2a862b32 AD |
2666 | security_release_secctx(ctx, len); |
2667 | } | |
0a4ff8c2 SG |
2668 | } |
2669 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2670 | audit_log_untrustedstring(ab, current->comm); | |
2671 | audit_log_format(ab, " sig=%ld", signr); | |
2672 | audit_log_end(ab); | |
2673 | } |