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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 <asm/types.h> |
49 | #include <linux/fs.h> | |
50 | #include <linux/namei.h> | |
1da177e4 LT |
51 | #include <linux/mm.h> |
52 | #include <linux/module.h> | |
01116105 | 53 | #include <linux/mount.h> |
3ec3b2fb | 54 | #include <linux/socket.h> |
20ca73bc | 55 | #include <linux/mqueue.h> |
1da177e4 LT |
56 | #include <linux/audit.h> |
57 | #include <linux/personality.h> | |
58 | #include <linux/time.h> | |
5bb289b5 | 59 | #include <linux/netlink.h> |
f5561964 | 60 | #include <linux/compiler.h> |
1da177e4 | 61 | #include <asm/unistd.h> |
8c8570fb | 62 | #include <linux/security.h> |
fe7752ba | 63 | #include <linux/list.h> |
a6c043a8 | 64 | #include <linux/tty.h> |
3dc7e315 | 65 | #include <linux/selinux.h> |
473ae30b | 66 | #include <linux/binfmts.h> |
a1f8e7f7 | 67 | #include <linux/highmem.h> |
f46038ff | 68 | #include <linux/syscalls.h> |
1da177e4 | 69 | |
fe7752ba | 70 | #include "audit.h" |
1da177e4 | 71 | |
fe7752ba | 72 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
73 | |
74 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
75 | extern int audit_enabled; | |
76 | ||
77 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
78 | * for saving names from getname(). */ | |
79 | #define AUDIT_NAMES 20 | |
80 | ||
9c937dcc AG |
81 | /* Indicates that audit should log the full pathname. */ |
82 | #define AUDIT_NAME_FULL -1 | |
83 | ||
471a5c7c AV |
84 | /* number of audit rules */ |
85 | int audit_n_rules; | |
86 | ||
e54dc243 AG |
87 | /* determines whether we collect data for signals sent */ |
88 | int audit_signals; | |
89 | ||
1da177e4 LT |
90 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
91 | * we don't let putname() free it (instead we free all of the saved | |
92 | * pointers at syscall exit time). | |
93 | * | |
94 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
95 | struct audit_names { | |
96 | const char *name; | |
9c937dcc AG |
97 | int name_len; /* number of name's characters to log */ |
98 | unsigned name_put; /* call __putname() for this name */ | |
1da177e4 LT |
99 | unsigned long ino; |
100 | dev_t dev; | |
101 | umode_t mode; | |
102 | uid_t uid; | |
103 | gid_t gid; | |
104 | dev_t rdev; | |
1b50eed9 | 105 | u32 osid; |
1da177e4 LT |
106 | }; |
107 | ||
108 | struct audit_aux_data { | |
109 | struct audit_aux_data *next; | |
110 | int type; | |
111 | }; | |
112 | ||
113 | #define AUDIT_AUX_IPCPERM 0 | |
114 | ||
e54dc243 AG |
115 | /* Number of target pids per aux struct. */ |
116 | #define AUDIT_AUX_PIDS 16 | |
117 | ||
20ca73bc GW |
118 | struct audit_aux_data_mq_open { |
119 | struct audit_aux_data d; | |
120 | int oflag; | |
121 | mode_t mode; | |
122 | struct mq_attr attr; | |
123 | }; | |
124 | ||
125 | struct audit_aux_data_mq_sendrecv { | |
126 | struct audit_aux_data d; | |
127 | mqd_t mqdes; | |
128 | size_t msg_len; | |
129 | unsigned int msg_prio; | |
130 | struct timespec abs_timeout; | |
131 | }; | |
132 | ||
133 | struct audit_aux_data_mq_notify { | |
134 | struct audit_aux_data d; | |
135 | mqd_t mqdes; | |
136 | struct sigevent notification; | |
137 | }; | |
138 | ||
139 | struct audit_aux_data_mq_getsetattr { | |
140 | struct audit_aux_data d; | |
141 | mqd_t mqdes; | |
142 | struct mq_attr mqstat; | |
143 | }; | |
144 | ||
1da177e4 LT |
145 | struct audit_aux_data_ipcctl { |
146 | struct audit_aux_data d; | |
147 | struct ipc_perm p; | |
148 | unsigned long qbytes; | |
149 | uid_t uid; | |
150 | gid_t gid; | |
151 | mode_t mode; | |
9c7aa6aa | 152 | u32 osid; |
1da177e4 LT |
153 | }; |
154 | ||
473ae30b AV |
155 | struct audit_aux_data_execve { |
156 | struct audit_aux_data d; | |
157 | int argc; | |
158 | int envc; | |
159 | char mem[0]; | |
160 | }; | |
161 | ||
3ec3b2fb DW |
162 | struct audit_aux_data_socketcall { |
163 | struct audit_aux_data d; | |
164 | int nargs; | |
165 | unsigned long args[0]; | |
166 | }; | |
167 | ||
168 | struct audit_aux_data_sockaddr { | |
169 | struct audit_aux_data d; | |
170 | int len; | |
171 | char a[0]; | |
172 | }; | |
173 | ||
db349509 AV |
174 | struct audit_aux_data_fd_pair { |
175 | struct audit_aux_data d; | |
176 | int fd[2]; | |
177 | }; | |
178 | ||
01116105 SS |
179 | struct audit_aux_data_path { |
180 | struct audit_aux_data d; | |
181 | struct dentry *dentry; | |
182 | struct vfsmount *mnt; | |
183 | }; | |
1da177e4 | 184 | |
e54dc243 AG |
185 | struct audit_aux_data_pids { |
186 | struct audit_aux_data d; | |
187 | pid_t target_pid[AUDIT_AUX_PIDS]; | |
188 | u32 target_sid[AUDIT_AUX_PIDS]; | |
189 | int pid_count; | |
190 | }; | |
191 | ||
1da177e4 LT |
192 | /* The per-task audit context. */ |
193 | struct audit_context { | |
d51374ad | 194 | int dummy; /* must be the first element */ |
1da177e4 LT |
195 | int in_syscall; /* 1 if task is in a syscall */ |
196 | enum audit_state state; | |
197 | unsigned int serial; /* serial number for record */ | |
198 | struct timespec ctime; /* time of syscall entry */ | |
199 | uid_t loginuid; /* login uid (identity) */ | |
200 | int major; /* syscall number */ | |
201 | unsigned long argv[4]; /* syscall arguments */ | |
202 | int return_valid; /* return code is valid */ | |
2fd6f58b | 203 | long return_code;/* syscall return code */ |
1da177e4 LT |
204 | int auditable; /* 1 if record should be written */ |
205 | int name_count; | |
206 | struct audit_names names[AUDIT_NAMES]; | |
5adc8a6a | 207 | char * filterkey; /* key for rule that triggered record */ |
8f37d47c DW |
208 | struct dentry * pwd; |
209 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
210 | struct audit_context *previous; /* For nested syscalls */ |
211 | struct audit_aux_data *aux; | |
e54dc243 | 212 | struct audit_aux_data *aux_pids; |
1da177e4 LT |
213 | |
214 | /* Save things to print about task_struct */ | |
f46038ff | 215 | pid_t pid, ppid; |
1da177e4 LT |
216 | uid_t uid, euid, suid, fsuid; |
217 | gid_t gid, egid, sgid, fsgid; | |
218 | unsigned long personality; | |
2fd6f58b | 219 | int arch; |
1da177e4 | 220 | |
a5cb013d AV |
221 | pid_t target_pid; |
222 | u32 target_sid; | |
223 | ||
1da177e4 LT |
224 | #if AUDIT_DEBUG |
225 | int put_count; | |
226 | int ino_count; | |
227 | #endif | |
228 | }; | |
229 | ||
55669bfa AV |
230 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
231 | static inline int open_arg(int flags, int mask) | |
232 | { | |
233 | int n = ACC_MODE(flags); | |
234 | if (flags & (O_TRUNC | O_CREAT)) | |
235 | n |= AUDIT_PERM_WRITE; | |
236 | return n & mask; | |
237 | } | |
238 | ||
239 | static int audit_match_perm(struct audit_context *ctx, int mask) | |
240 | { | |
241 | unsigned n = ctx->major; | |
242 | switch (audit_classify_syscall(ctx->arch, n)) { | |
243 | case 0: /* native */ | |
244 | if ((mask & AUDIT_PERM_WRITE) && | |
245 | audit_match_class(AUDIT_CLASS_WRITE, n)) | |
246 | return 1; | |
247 | if ((mask & AUDIT_PERM_READ) && | |
248 | audit_match_class(AUDIT_CLASS_READ, n)) | |
249 | return 1; | |
250 | if ((mask & AUDIT_PERM_ATTR) && | |
251 | audit_match_class(AUDIT_CLASS_CHATTR, n)) | |
252 | return 1; | |
253 | return 0; | |
254 | case 1: /* 32bit on biarch */ | |
255 | if ((mask & AUDIT_PERM_WRITE) && | |
256 | audit_match_class(AUDIT_CLASS_WRITE_32, n)) | |
257 | return 1; | |
258 | if ((mask & AUDIT_PERM_READ) && | |
259 | audit_match_class(AUDIT_CLASS_READ_32, n)) | |
260 | return 1; | |
261 | if ((mask & AUDIT_PERM_ATTR) && | |
262 | audit_match_class(AUDIT_CLASS_CHATTR_32, n)) | |
263 | return 1; | |
264 | return 0; | |
265 | case 2: /* open */ | |
266 | return mask & ACC_MODE(ctx->argv[1]); | |
267 | case 3: /* openat */ | |
268 | return mask & ACC_MODE(ctx->argv[2]); | |
269 | case 4: /* socketcall */ | |
270 | return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); | |
271 | case 5: /* execve */ | |
272 | return mask & AUDIT_PERM_EXEC; | |
273 | default: | |
274 | return 0; | |
275 | } | |
276 | } | |
277 | ||
f368c07d | 278 | /* Determine if any context name data matches a rule's watch data */ |
1da177e4 LT |
279 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 |
280 | * otherwise. */ | |
281 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 282 | struct audit_krule *rule, |
1da177e4 | 283 | struct audit_context *ctx, |
f368c07d | 284 | struct audit_names *name, |
1da177e4 LT |
285 | enum audit_state *state) |
286 | { | |
2ad312d2 | 287 | int i, j, need_sid = 1; |
3dc7e315 DG |
288 | u32 sid; |
289 | ||
1da177e4 | 290 | for (i = 0; i < rule->field_count; i++) { |
93315ed6 | 291 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
292 | int result = 0; |
293 | ||
93315ed6 | 294 | switch (f->type) { |
1da177e4 | 295 | case AUDIT_PID: |
93315ed6 | 296 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 | 297 | break; |
3c66251e | 298 | case AUDIT_PPID: |
419c58f1 AV |
299 | if (ctx) { |
300 | if (!ctx->ppid) | |
301 | ctx->ppid = sys_getppid(); | |
3c66251e | 302 | result = audit_comparator(ctx->ppid, f->op, f->val); |
419c58f1 | 303 | } |
3c66251e | 304 | break; |
1da177e4 | 305 | case AUDIT_UID: |
93315ed6 | 306 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
307 | break; |
308 | case AUDIT_EUID: | |
93315ed6 | 309 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
310 | break; |
311 | case AUDIT_SUID: | |
93315ed6 | 312 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
313 | break; |
314 | case AUDIT_FSUID: | |
93315ed6 | 315 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
316 | break; |
317 | case AUDIT_GID: | |
93315ed6 | 318 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
319 | break; |
320 | case AUDIT_EGID: | |
93315ed6 | 321 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
322 | break; |
323 | case AUDIT_SGID: | |
93315ed6 | 324 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
325 | break; |
326 | case AUDIT_FSGID: | |
93315ed6 | 327 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
328 | break; |
329 | case AUDIT_PERS: | |
93315ed6 | 330 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 331 | break; |
2fd6f58b | 332 | case AUDIT_ARCH: |
b63862f4 | 333 | if (ctx) |
93315ed6 | 334 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 335 | break; |
1da177e4 LT |
336 | |
337 | case AUDIT_EXIT: | |
338 | if (ctx && ctx->return_valid) | |
93315ed6 | 339 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
340 | break; |
341 | case AUDIT_SUCCESS: | |
b01f2cc1 | 342 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
343 | if (f->val) |
344 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 345 | else |
93315ed6 | 346 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 347 | } |
1da177e4 LT |
348 | break; |
349 | case AUDIT_DEVMAJOR: | |
f368c07d AG |
350 | if (name) |
351 | result = audit_comparator(MAJOR(name->dev), | |
352 | f->op, f->val); | |
353 | else if (ctx) { | |
1da177e4 | 354 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 355 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
356 | ++result; |
357 | break; | |
358 | } | |
359 | } | |
360 | } | |
361 | break; | |
362 | case AUDIT_DEVMINOR: | |
f368c07d AG |
363 | if (name) |
364 | result = audit_comparator(MINOR(name->dev), | |
365 | f->op, f->val); | |
366 | else if (ctx) { | |
1da177e4 | 367 | for (j = 0; j < ctx->name_count; j++) { |
93315ed6 | 368 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
369 | ++result; |
370 | break; | |
371 | } | |
372 | } | |
373 | } | |
374 | break; | |
375 | case AUDIT_INODE: | |
f368c07d | 376 | if (name) |
9c937dcc | 377 | result = (name->ino == f->val); |
f368c07d | 378 | else if (ctx) { |
1da177e4 | 379 | for (j = 0; j < ctx->name_count; j++) { |
9c937dcc | 380 | if (audit_comparator(ctx->names[j].ino, f->op, f->val)) { |
1da177e4 LT |
381 | ++result; |
382 | break; | |
383 | } | |
384 | } | |
385 | } | |
386 | break; | |
f368c07d AG |
387 | case AUDIT_WATCH: |
388 | if (name && rule->watch->ino != (unsigned long)-1) | |
389 | result = (name->dev == rule->watch->dev && | |
9c937dcc | 390 | name->ino == rule->watch->ino); |
f368c07d | 391 | break; |
1da177e4 LT |
392 | case AUDIT_LOGINUID: |
393 | result = 0; | |
394 | if (ctx) | |
93315ed6 | 395 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 396 | break; |
3a6b9f85 DG |
397 | case AUDIT_SUBJ_USER: |
398 | case AUDIT_SUBJ_ROLE: | |
399 | case AUDIT_SUBJ_TYPE: | |
400 | case AUDIT_SUBJ_SEN: | |
401 | case AUDIT_SUBJ_CLR: | |
3dc7e315 DG |
402 | /* NOTE: this may return negative values indicating |
403 | a temporary error. We simply treat this as a | |
404 | match for now to avoid losing information that | |
405 | may be wanted. An error message will also be | |
406 | logged upon error */ | |
2ad312d2 SG |
407 | if (f->se_rule) { |
408 | if (need_sid) { | |
62bac018 | 409 | selinux_get_task_sid(tsk, &sid); |
2ad312d2 SG |
410 | need_sid = 0; |
411 | } | |
3dc7e315 DG |
412 | result = selinux_audit_rule_match(sid, f->type, |
413 | f->op, | |
414 | f->se_rule, | |
415 | ctx); | |
2ad312d2 | 416 | } |
3dc7e315 | 417 | break; |
6e5a2d1d DG |
418 | case AUDIT_OBJ_USER: |
419 | case AUDIT_OBJ_ROLE: | |
420 | case AUDIT_OBJ_TYPE: | |
421 | case AUDIT_OBJ_LEV_LOW: | |
422 | case AUDIT_OBJ_LEV_HIGH: | |
423 | /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR | |
424 | also applies here */ | |
425 | if (f->se_rule) { | |
426 | /* Find files that match */ | |
427 | if (name) { | |
428 | result = selinux_audit_rule_match( | |
429 | name->osid, f->type, f->op, | |
430 | f->se_rule, ctx); | |
431 | } else if (ctx) { | |
432 | for (j = 0; j < ctx->name_count; j++) { | |
433 | if (selinux_audit_rule_match( | |
434 | ctx->names[j].osid, | |
435 | f->type, f->op, | |
436 | f->se_rule, ctx)) { | |
437 | ++result; | |
438 | break; | |
439 | } | |
440 | } | |
441 | } | |
442 | /* Find ipc objects that match */ | |
443 | if (ctx) { | |
444 | struct audit_aux_data *aux; | |
445 | for (aux = ctx->aux; aux; | |
446 | aux = aux->next) { | |
447 | if (aux->type == AUDIT_IPC) { | |
448 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
449 | if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) { | |
450 | ++result; | |
451 | break; | |
452 | } | |
453 | } | |
454 | } | |
455 | } | |
456 | } | |
457 | break; | |
1da177e4 LT |
458 | case AUDIT_ARG0: |
459 | case AUDIT_ARG1: | |
460 | case AUDIT_ARG2: | |
461 | case AUDIT_ARG3: | |
462 | if (ctx) | |
93315ed6 | 463 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 | 464 | break; |
5adc8a6a AG |
465 | case AUDIT_FILTERKEY: |
466 | /* ignore this field for filtering */ | |
467 | result = 1; | |
468 | break; | |
55669bfa AV |
469 | case AUDIT_PERM: |
470 | result = audit_match_perm(ctx, f->val); | |
471 | break; | |
1da177e4 LT |
472 | } |
473 | ||
1da177e4 LT |
474 | if (!result) |
475 | return 0; | |
476 | } | |
5adc8a6a AG |
477 | if (rule->filterkey) |
478 | ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); | |
1da177e4 LT |
479 | switch (rule->action) { |
480 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
1da177e4 LT |
481 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
482 | } | |
483 | return 1; | |
484 | } | |
485 | ||
486 | /* At process creation time, we can determine if system-call auditing is | |
487 | * completely disabled for this task. Since we only have the task | |
488 | * structure at this point, we can only check uid and gid. | |
489 | */ | |
490 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
491 | { | |
492 | struct audit_entry *e; | |
493 | enum audit_state state; | |
494 | ||
495 | rcu_read_lock(); | |
0f45aa18 | 496 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
f368c07d | 497 | if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) { |
1da177e4 LT |
498 | rcu_read_unlock(); |
499 | return state; | |
500 | } | |
501 | } | |
502 | rcu_read_unlock(); | |
503 | return AUDIT_BUILD_CONTEXT; | |
504 | } | |
505 | ||
506 | /* At syscall entry and exit time, this filter is called if the | |
507 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 508 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 509 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
510 | */ |
511 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
512 | struct audit_context *ctx, | |
513 | struct list_head *list) | |
514 | { | |
515 | struct audit_entry *e; | |
c3896495 | 516 | enum audit_state state; |
1da177e4 | 517 | |
351bb722 | 518 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
519 | return AUDIT_DISABLED; |
520 | ||
1da177e4 | 521 | rcu_read_lock(); |
c3896495 | 522 | if (!list_empty(list)) { |
b63862f4 DK |
523 | int word = AUDIT_WORD(ctx->major); |
524 | int bit = AUDIT_BIT(ctx->major); | |
525 | ||
526 | list_for_each_entry_rcu(e, list, list) { | |
f368c07d AG |
527 | if ((e->rule.mask[word] & bit) == bit && |
528 | audit_filter_rules(tsk, &e->rule, ctx, NULL, | |
529 | &state)) { | |
530 | rcu_read_unlock(); | |
531 | return state; | |
532 | } | |
533 | } | |
534 | } | |
535 | rcu_read_unlock(); | |
536 | return AUDIT_BUILD_CONTEXT; | |
537 | } | |
538 | ||
539 | /* At syscall exit time, this filter is called if any audit_names[] have been | |
540 | * collected during syscall processing. We only check rules in sublists at hash | |
541 | * buckets applicable to the inode numbers in audit_names[]. | |
542 | * Regarding audit_state, same rules apply as for audit_filter_syscall(). | |
543 | */ | |
544 | enum audit_state audit_filter_inodes(struct task_struct *tsk, | |
545 | struct audit_context *ctx) | |
546 | { | |
547 | int i; | |
548 | struct audit_entry *e; | |
549 | enum audit_state state; | |
550 | ||
551 | if (audit_pid && tsk->tgid == audit_pid) | |
552 | return AUDIT_DISABLED; | |
553 | ||
554 | rcu_read_lock(); | |
555 | for (i = 0; i < ctx->name_count; i++) { | |
556 | int word = AUDIT_WORD(ctx->major); | |
557 | int bit = AUDIT_BIT(ctx->major); | |
558 | struct audit_names *n = &ctx->names[i]; | |
559 | int h = audit_hash_ino((u32)n->ino); | |
560 | struct list_head *list = &audit_inode_hash[h]; | |
561 | ||
562 | if (list_empty(list)) | |
563 | continue; | |
564 | ||
565 | list_for_each_entry_rcu(e, list, list) { | |
566 | if ((e->rule.mask[word] & bit) == bit && | |
567 | audit_filter_rules(tsk, &e->rule, ctx, n, &state)) { | |
b63862f4 DK |
568 | rcu_read_unlock(); |
569 | return state; | |
570 | } | |
0f45aa18 DW |
571 | } |
572 | } | |
573 | rcu_read_unlock(); | |
1da177e4 | 574 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
575 | } |
576 | ||
f368c07d AG |
577 | void audit_set_auditable(struct audit_context *ctx) |
578 | { | |
579 | ctx->auditable = 1; | |
580 | } | |
581 | ||
1da177e4 LT |
582 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
583 | int return_valid, | |
584 | int return_code) | |
585 | { | |
586 | struct audit_context *context = tsk->audit_context; | |
587 | ||
588 | if (likely(!context)) | |
589 | return NULL; | |
590 | context->return_valid = return_valid; | |
591 | context->return_code = return_code; | |
592 | ||
d51374ad | 593 | if (context->in_syscall && !context->dummy && !context->auditable) { |
1da177e4 | 594 | enum audit_state state; |
f368c07d | 595 | |
0f45aa18 | 596 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
f368c07d AG |
597 | if (state == AUDIT_RECORD_CONTEXT) { |
598 | context->auditable = 1; | |
599 | goto get_context; | |
600 | } | |
601 | ||
602 | state = audit_filter_inodes(tsk, context); | |
1da177e4 LT |
603 | if (state == AUDIT_RECORD_CONTEXT) |
604 | context->auditable = 1; | |
f368c07d | 605 | |
1da177e4 LT |
606 | } |
607 | ||
f368c07d | 608 | get_context: |
3f2792ff | 609 | |
1da177e4 LT |
610 | tsk->audit_context = NULL; |
611 | return context; | |
612 | } | |
613 | ||
614 | static inline void audit_free_names(struct audit_context *context) | |
615 | { | |
616 | int i; | |
617 | ||
618 | #if AUDIT_DEBUG == 2 | |
619 | if (context->auditable | |
620 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 621 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
622 | " name_count=%d put_count=%d" |
623 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 624 | __FILE__, __LINE__, |
1da177e4 LT |
625 | context->serial, context->major, context->in_syscall, |
626 | context->name_count, context->put_count, | |
627 | context->ino_count); | |
8c8570fb | 628 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
629 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
630 | context->names[i].name, | |
73241ccc | 631 | context->names[i].name ?: "(null)"); |
8c8570fb | 632 | } |
1da177e4 LT |
633 | dump_stack(); |
634 | return; | |
635 | } | |
636 | #endif | |
637 | #if AUDIT_DEBUG | |
638 | context->put_count = 0; | |
639 | context->ino_count = 0; | |
640 | #endif | |
641 | ||
8c8570fb | 642 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 643 | if (context->names[i].name && context->names[i].name_put) |
1da177e4 | 644 | __putname(context->names[i].name); |
8c8570fb | 645 | } |
1da177e4 | 646 | context->name_count = 0; |
8f37d47c DW |
647 | if (context->pwd) |
648 | dput(context->pwd); | |
649 | if (context->pwdmnt) | |
650 | mntput(context->pwdmnt); | |
651 | context->pwd = NULL; | |
652 | context->pwdmnt = NULL; | |
1da177e4 LT |
653 | } |
654 | ||
655 | static inline void audit_free_aux(struct audit_context *context) | |
656 | { | |
657 | struct audit_aux_data *aux; | |
658 | ||
659 | while ((aux = context->aux)) { | |
01116105 SS |
660 | if (aux->type == AUDIT_AVC_PATH) { |
661 | struct audit_aux_data_path *axi = (void *)aux; | |
662 | dput(axi->dentry); | |
663 | mntput(axi->mnt); | |
664 | } | |
8c8570fb | 665 | |
1da177e4 LT |
666 | context->aux = aux->next; |
667 | kfree(aux); | |
668 | } | |
e54dc243 AG |
669 | while ((aux = context->aux_pids)) { |
670 | context->aux_pids = aux->next; | |
671 | kfree(aux); | |
672 | } | |
1da177e4 LT |
673 | } |
674 | ||
675 | static inline void audit_zero_context(struct audit_context *context, | |
676 | enum audit_state state) | |
677 | { | |
678 | uid_t loginuid = context->loginuid; | |
679 | ||
680 | memset(context, 0, sizeof(*context)); | |
681 | context->state = state; | |
682 | context->loginuid = loginuid; | |
683 | } | |
684 | ||
685 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
686 | { | |
687 | struct audit_context *context; | |
688 | ||
689 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
690 | return NULL; | |
691 | audit_zero_context(context, state); | |
692 | return context; | |
693 | } | |
694 | ||
b0dd25a8 RD |
695 | /** |
696 | * audit_alloc - allocate an audit context block for a task | |
697 | * @tsk: task | |
698 | * | |
699 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
700 | * if necessary. Doing so turns on system call auditing for the |
701 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
702 | * needed. |
703 | */ | |
1da177e4 LT |
704 | int audit_alloc(struct task_struct *tsk) |
705 | { | |
706 | struct audit_context *context; | |
707 | enum audit_state state; | |
708 | ||
709 | if (likely(!audit_enabled)) | |
710 | return 0; /* Return if not auditing. */ | |
711 | ||
712 | state = audit_filter_task(tsk); | |
713 | if (likely(state == AUDIT_DISABLED)) | |
714 | return 0; | |
715 | ||
716 | if (!(context = audit_alloc_context(state))) { | |
717 | audit_log_lost("out of memory in audit_alloc"); | |
718 | return -ENOMEM; | |
719 | } | |
720 | ||
721 | /* Preserve login uid */ | |
722 | context->loginuid = -1; | |
723 | if (current->audit_context) | |
724 | context->loginuid = current->audit_context->loginuid; | |
725 | ||
726 | tsk->audit_context = context; | |
727 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | static inline void audit_free_context(struct audit_context *context) | |
732 | { | |
733 | struct audit_context *previous; | |
734 | int count = 0; | |
735 | ||
736 | do { | |
737 | previous = context->previous; | |
738 | if (previous || (count && count < 10)) { | |
739 | ++count; | |
740 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
741 | " freeing multiple contexts (%d)\n", | |
742 | context->serial, context->major, | |
743 | context->name_count, count); | |
744 | } | |
745 | audit_free_names(context); | |
746 | audit_free_aux(context); | |
5adc8a6a | 747 | kfree(context->filterkey); |
1da177e4 LT |
748 | kfree(context); |
749 | context = previous; | |
750 | } while (context); | |
751 | if (count >= 10) | |
752 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
753 | } | |
754 | ||
161a09e7 | 755 | void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
756 | { |
757 | char *ctx = NULL; | |
c4823bce AV |
758 | unsigned len; |
759 | int error; | |
760 | u32 sid; | |
761 | ||
762 | selinux_get_task_sid(current, &sid); | |
763 | if (!sid) | |
764 | return; | |
8c8570fb | 765 | |
c4823bce AV |
766 | error = selinux_sid_to_string(sid, &ctx, &len); |
767 | if (error) { | |
768 | if (error != -EINVAL) | |
8c8570fb DK |
769 | goto error_path; |
770 | return; | |
771 | } | |
772 | ||
8c8570fb | 773 | audit_log_format(ab, " subj=%s", ctx); |
c4823bce | 774 | kfree(ctx); |
7306a0b9 | 775 | return; |
8c8570fb DK |
776 | |
777 | error_path: | |
7306a0b9 | 778 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
779 | return; |
780 | } | |
781 | ||
161a09e7 JL |
782 | EXPORT_SYMBOL(audit_log_task_context); |
783 | ||
e495149b | 784 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 785 | { |
45d9bb0e AV |
786 | char name[sizeof(tsk->comm)]; |
787 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
788 | struct vm_area_struct *vma; |
789 | ||
e495149b AV |
790 | /* tsk == current */ |
791 | ||
45d9bb0e | 792 | get_task_comm(name, tsk); |
99e45eea DW |
793 | audit_log_format(ab, " comm="); |
794 | audit_log_untrustedstring(ab, name); | |
219f0817 | 795 | |
e495149b AV |
796 | if (mm) { |
797 | down_read(&mm->mmap_sem); | |
798 | vma = mm->mmap; | |
799 | while (vma) { | |
800 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
801 | vma->vm_file) { | |
802 | audit_log_d_path(ab, "exe=", | |
a7a005fd JS |
803 | vma->vm_file->f_path.dentry, |
804 | vma->vm_file->f_path.mnt); | |
e495149b AV |
805 | break; |
806 | } | |
807 | vma = vma->vm_next; | |
219f0817 | 808 | } |
e495149b | 809 | up_read(&mm->mmap_sem); |
219f0817 | 810 | } |
e495149b | 811 | audit_log_task_context(ab); |
219f0817 SS |
812 | } |
813 | ||
e54dc243 AG |
814 | static int audit_log_pid_context(struct audit_context *context, pid_t pid, |
815 | u32 sid) | |
816 | { | |
817 | struct audit_buffer *ab; | |
818 | char *s = NULL; | |
819 | u32 len; | |
820 | int rc = 0; | |
821 | ||
822 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); | |
823 | if (!ab) | |
824 | return 1; | |
825 | ||
826 | if (selinux_sid_to_string(sid, &s, &len)) { | |
827 | audit_log_format(ab, "opid=%d obj=(none)", pid); | |
828 | rc = 1; | |
829 | } else | |
830 | audit_log_format(ab, "opid=%d obj=%s", pid, s); | |
831 | audit_log_end(ab); | |
832 | kfree(s); | |
833 | ||
834 | return rc; | |
835 | } | |
836 | ||
e495149b | 837 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 | 838 | { |
9c7aa6aa | 839 | int i, call_panic = 0; |
1da177e4 | 840 | struct audit_buffer *ab; |
7551ced3 | 841 | struct audit_aux_data *aux; |
a6c043a8 | 842 | const char *tty; |
1da177e4 | 843 | |
e495149b | 844 | /* tsk == current */ |
3f2792ff | 845 | context->pid = tsk->pid; |
419c58f1 AV |
846 | if (!context->ppid) |
847 | context->ppid = sys_getppid(); | |
3f2792ff AV |
848 | context->uid = tsk->uid; |
849 | context->gid = tsk->gid; | |
850 | context->euid = tsk->euid; | |
851 | context->suid = tsk->suid; | |
852 | context->fsuid = tsk->fsuid; | |
853 | context->egid = tsk->egid; | |
854 | context->sgid = tsk->sgid; | |
855 | context->fsgid = tsk->fsgid; | |
856 | context->personality = tsk->personality; | |
e495149b AV |
857 | |
858 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
859 | if (!ab) |
860 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
861 | audit_log_format(ab, "arch=%x syscall=%d", |
862 | context->arch, context->major); | |
1da177e4 LT |
863 | if (context->personality != PER_LINUX) |
864 | audit_log_format(ab, " per=%lx", context->personality); | |
865 | if (context->return_valid) | |
2fd6f58b DW |
866 | audit_log_format(ab, " success=%s exit=%ld", |
867 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
868 | context->return_code); | |
eb84a20e AC |
869 | |
870 | mutex_lock(&tty_mutex); | |
24ec839c | 871 | read_lock(&tasklist_lock); |
45d9bb0e AV |
872 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
873 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
874 | else |
875 | tty = "(none)"; | |
24ec839c | 876 | read_unlock(&tasklist_lock); |
1da177e4 LT |
877 | audit_log_format(ab, |
878 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
f46038ff | 879 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
326e9c8b | 880 | " euid=%u suid=%u fsuid=%u" |
a6c043a8 | 881 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
882 | context->argv[0], |
883 | context->argv[1], | |
884 | context->argv[2], | |
885 | context->argv[3], | |
886 | context->name_count, | |
f46038ff | 887 | context->ppid, |
1da177e4 LT |
888 | context->pid, |
889 | context->loginuid, | |
890 | context->uid, | |
891 | context->gid, | |
892 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 893 | context->egid, context->sgid, context->fsgid, tty); |
eb84a20e AC |
894 | |
895 | mutex_unlock(&tty_mutex); | |
896 | ||
e495149b | 897 | audit_log_task_info(ab, tsk); |
5adc8a6a AG |
898 | if (context->filterkey) { |
899 | audit_log_format(ab, " key="); | |
900 | audit_log_untrustedstring(ab, context->filterkey); | |
901 | } else | |
902 | audit_log_format(ab, " key=(null)"); | |
1da177e4 | 903 | audit_log_end(ab); |
1da177e4 | 904 | |
7551ced3 | 905 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 906 | |
e495149b | 907 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
908 | if (!ab) |
909 | continue; /* audit_panic has been called */ | |
910 | ||
1da177e4 | 911 | switch (aux->type) { |
20ca73bc GW |
912 | case AUDIT_MQ_OPEN: { |
913 | struct audit_aux_data_mq_open *axi = (void *)aux; | |
914 | audit_log_format(ab, | |
915 | "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld " | |
916 | "mq_msgsize=%ld mq_curmsgs=%ld", | |
917 | axi->oflag, axi->mode, axi->attr.mq_flags, | |
918 | axi->attr.mq_maxmsg, axi->attr.mq_msgsize, | |
919 | axi->attr.mq_curmsgs); | |
920 | break; } | |
921 | ||
922 | case AUDIT_MQ_SENDRECV: { | |
923 | struct audit_aux_data_mq_sendrecv *axi = (void *)aux; | |
924 | audit_log_format(ab, | |
925 | "mqdes=%d msg_len=%zd msg_prio=%u " | |
926 | "abs_timeout_sec=%ld abs_timeout_nsec=%ld", | |
927 | axi->mqdes, axi->msg_len, axi->msg_prio, | |
928 | axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec); | |
929 | break; } | |
930 | ||
931 | case AUDIT_MQ_NOTIFY: { | |
932 | struct audit_aux_data_mq_notify *axi = (void *)aux; | |
933 | audit_log_format(ab, | |
934 | "mqdes=%d sigev_signo=%d", | |
935 | axi->mqdes, | |
936 | axi->notification.sigev_signo); | |
937 | break; } | |
938 | ||
939 | case AUDIT_MQ_GETSETATTR: { | |
940 | struct audit_aux_data_mq_getsetattr *axi = (void *)aux; | |
941 | audit_log_format(ab, | |
942 | "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld " | |
943 | "mq_curmsgs=%ld ", | |
944 | axi->mqdes, | |
945 | axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg, | |
946 | axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs); | |
947 | break; } | |
948 | ||
c0404993 | 949 | case AUDIT_IPC: { |
1da177e4 LT |
950 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
951 | audit_log_format(ab, | |
ac03221a LK |
952 | "ouid=%u ogid=%u mode=%x", |
953 | axi->uid, axi->gid, axi->mode); | |
9c7aa6aa SG |
954 | if (axi->osid != 0) { |
955 | char *ctx = NULL; | |
956 | u32 len; | |
1a70cd40 | 957 | if (selinux_sid_to_string( |
9c7aa6aa | 958 | axi->osid, &ctx, &len)) { |
ce29b682 | 959 | audit_log_format(ab, " osid=%u", |
9c7aa6aa SG |
960 | axi->osid); |
961 | call_panic = 1; | |
962 | } else | |
963 | audit_log_format(ab, " obj=%s", ctx); | |
964 | kfree(ctx); | |
965 | } | |
3ec3b2fb DW |
966 | break; } |
967 | ||
073115d6 SG |
968 | case AUDIT_IPC_SET_PERM: { |
969 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
970 | audit_log_format(ab, | |
ac03221a | 971 | "qbytes=%lx ouid=%u ogid=%u mode=%x", |
073115d6 | 972 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
073115d6 | 973 | break; } |
ac03221a | 974 | |
473ae30b AV |
975 | case AUDIT_EXECVE: { |
976 | struct audit_aux_data_execve *axi = (void *)aux; | |
977 | int i; | |
978 | const char *p; | |
979 | for (i = 0, p = axi->mem; i < axi->argc; i++) { | |
980 | audit_log_format(ab, "a%d=", i); | |
981 | p = audit_log_untrustedstring(ab, p); | |
982 | audit_log_format(ab, "\n"); | |
983 | } | |
984 | break; } | |
073115d6 | 985 | |
3ec3b2fb DW |
986 | case AUDIT_SOCKETCALL: { |
987 | int i; | |
988 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
989 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
990 | for (i=0; i<axs->nargs; i++) | |
991 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
992 | break; } | |
993 | ||
994 | case AUDIT_SOCKADDR: { | |
995 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
996 | ||
997 | audit_log_format(ab, "saddr="); | |
998 | audit_log_hex(ab, axs->a, axs->len); | |
999 | break; } | |
01116105 SS |
1000 | |
1001 | case AUDIT_AVC_PATH: { | |
1002 | struct audit_aux_data_path *axi = (void *)aux; | |
1003 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
1004 | break; } |
1005 | ||
db349509 AV |
1006 | case AUDIT_FD_PAIR: { |
1007 | struct audit_aux_data_fd_pair *axs = (void *)aux; | |
1008 | audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); | |
1009 | break; } | |
1010 | ||
1da177e4 LT |
1011 | } |
1012 | audit_log_end(ab); | |
1da177e4 LT |
1013 | } |
1014 | ||
e54dc243 AG |
1015 | for (aux = context->aux_pids; aux; aux = aux->next) { |
1016 | struct audit_aux_data_pids *axs = (void *)aux; | |
1017 | int i; | |
1018 | ||
1019 | for (i = 0; i < axs->pid_count; i++) | |
1020 | if (audit_log_pid_context(context, axs->target_pid[i], | |
1021 | axs->target_sid[i])) | |
1022 | call_panic = 1; | |
a5cb013d AV |
1023 | } |
1024 | ||
e54dc243 AG |
1025 | if (context->target_pid && |
1026 | audit_log_pid_context(context, context->target_pid, | |
1027 | context->target_sid)) | |
1028 | call_panic = 1; | |
1029 | ||
8f37d47c | 1030 | if (context->pwd && context->pwdmnt) { |
e495149b | 1031 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
1032 | if (ab) { |
1033 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
1034 | audit_log_end(ab); | |
1035 | } | |
1036 | } | |
1da177e4 | 1037 | for (i = 0; i < context->name_count; i++) { |
9c937dcc | 1038 | struct audit_names *n = &context->names[i]; |
73241ccc | 1039 | |
e495149b | 1040 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
1041 | if (!ab) |
1042 | continue; /* audit_panic has been called */ | |
8f37d47c | 1043 | |
1da177e4 | 1044 | audit_log_format(ab, "item=%d", i); |
73241ccc | 1045 | |
9c937dcc AG |
1046 | if (n->name) { |
1047 | switch(n->name_len) { | |
1048 | case AUDIT_NAME_FULL: | |
1049 | /* log the full path */ | |
1050 | audit_log_format(ab, " name="); | |
1051 | audit_log_untrustedstring(ab, n->name); | |
1052 | break; | |
1053 | case 0: | |
1054 | /* name was specified as a relative path and the | |
1055 | * directory component is the cwd */ | |
1056 | audit_log_d_path(ab, " name=", context->pwd, | |
1057 | context->pwdmnt); | |
1058 | break; | |
1059 | default: | |
1060 | /* log the name's directory component */ | |
1061 | audit_log_format(ab, " name="); | |
1062 | audit_log_n_untrustedstring(ab, n->name_len, | |
1063 | n->name); | |
1064 | } | |
1065 | } else | |
1066 | audit_log_format(ab, " name=(null)"); | |
1067 | ||
1068 | if (n->ino != (unsigned long)-1) { | |
1069 | audit_log_format(ab, " inode=%lu" | |
1070 | " dev=%02x:%02x mode=%#o" | |
1071 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1072 | n->ino, | |
1073 | MAJOR(n->dev), | |
1074 | MINOR(n->dev), | |
1075 | n->mode, | |
1076 | n->uid, | |
1077 | n->gid, | |
1078 | MAJOR(n->rdev), | |
1079 | MINOR(n->rdev)); | |
1080 | } | |
1081 | if (n->osid != 0) { | |
1b50eed9 SG |
1082 | char *ctx = NULL; |
1083 | u32 len; | |
1a70cd40 | 1084 | if (selinux_sid_to_string( |
9c937dcc AG |
1085 | n->osid, &ctx, &len)) { |
1086 | audit_log_format(ab, " osid=%u", n->osid); | |
9c7aa6aa | 1087 | call_panic = 2; |
1b50eed9 SG |
1088 | } else |
1089 | audit_log_format(ab, " obj=%s", ctx); | |
1090 | kfree(ctx); | |
8c8570fb DK |
1091 | } |
1092 | ||
1da177e4 LT |
1093 | audit_log_end(ab); |
1094 | } | |
9c7aa6aa SG |
1095 | if (call_panic) |
1096 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
1097 | } |
1098 | ||
b0dd25a8 RD |
1099 | /** |
1100 | * audit_free - free a per-task audit context | |
1101 | * @tsk: task whose audit context block to free | |
1102 | * | |
fa84cb93 | 1103 | * Called from copy_process and do_exit |
b0dd25a8 | 1104 | */ |
1da177e4 LT |
1105 | void audit_free(struct task_struct *tsk) |
1106 | { | |
1107 | struct audit_context *context; | |
1108 | ||
1da177e4 | 1109 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
1110 | if (likely(!context)) |
1111 | return; | |
1112 | ||
1113 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
1114 | * function (e.g., exit_group), then free context block. |
1115 | * We use GFP_ATOMIC here because we might be doing this | |
1116 | * in the context of the idle thread */ | |
e495149b | 1117 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 1118 | if (context->in_syscall && context->auditable) |
e495149b | 1119 | audit_log_exit(context, tsk); |
1da177e4 LT |
1120 | |
1121 | audit_free_context(context); | |
1122 | } | |
1123 | ||
b0dd25a8 RD |
1124 | /** |
1125 | * audit_syscall_entry - fill in an audit record at syscall entry | |
1126 | * @tsk: task being audited | |
1127 | * @arch: architecture type | |
1128 | * @major: major syscall type (function) | |
1129 | * @a1: additional syscall register 1 | |
1130 | * @a2: additional syscall register 2 | |
1131 | * @a3: additional syscall register 3 | |
1132 | * @a4: additional syscall register 4 | |
1133 | * | |
1134 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
1135 | * audit context was created when the task was created and the state or |
1136 | * filters demand the audit context be built. If the state from the | |
1137 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
1138 | * then the record will be written at syscall exit time (otherwise, it | |
1139 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
1140 | * be written). |
1141 | */ | |
5411be59 | 1142 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
1143 | unsigned long a1, unsigned long a2, |
1144 | unsigned long a3, unsigned long a4) | |
1145 | { | |
5411be59 | 1146 | struct task_struct *tsk = current; |
1da177e4 LT |
1147 | struct audit_context *context = tsk->audit_context; |
1148 | enum audit_state state; | |
1149 | ||
1150 | BUG_ON(!context); | |
1151 | ||
b0dd25a8 RD |
1152 | /* |
1153 | * This happens only on certain architectures that make system | |
1da177e4 LT |
1154 | * calls in kernel_thread via the entry.S interface, instead of |
1155 | * with direct calls. (If you are porting to a new | |
1156 | * architecture, hitting this condition can indicate that you | |
1157 | * got the _exit/_leave calls backward in entry.S.) | |
1158 | * | |
1159 | * i386 no | |
1160 | * x86_64 no | |
2ef9481e | 1161 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
1162 | * |
1163 | * This also happens with vm86 emulation in a non-nested manner | |
1164 | * (entries without exits), so this case must be caught. | |
1165 | */ | |
1166 | if (context->in_syscall) { | |
1167 | struct audit_context *newctx; | |
1168 | ||
1da177e4 LT |
1169 | #if AUDIT_DEBUG |
1170 | printk(KERN_ERR | |
1171 | "audit(:%d) pid=%d in syscall=%d;" | |
1172 | " entering syscall=%d\n", | |
1173 | context->serial, tsk->pid, context->major, major); | |
1174 | #endif | |
1175 | newctx = audit_alloc_context(context->state); | |
1176 | if (newctx) { | |
1177 | newctx->previous = context; | |
1178 | context = newctx; | |
1179 | tsk->audit_context = newctx; | |
1180 | } else { | |
1181 | /* If we can't alloc a new context, the best we | |
1182 | * can do is to leak memory (any pending putname | |
1183 | * will be lost). The only other alternative is | |
1184 | * to abandon auditing. */ | |
1185 | audit_zero_context(context, context->state); | |
1186 | } | |
1187 | } | |
1188 | BUG_ON(context->in_syscall || context->name_count); | |
1189 | ||
1190 | if (!audit_enabled) | |
1191 | return; | |
1192 | ||
2fd6f58b | 1193 | context->arch = arch; |
1da177e4 LT |
1194 | context->major = major; |
1195 | context->argv[0] = a1; | |
1196 | context->argv[1] = a2; | |
1197 | context->argv[2] = a3; | |
1198 | context->argv[3] = a4; | |
1199 | ||
1200 | state = context->state; | |
d51374ad AV |
1201 | context->dummy = !audit_n_rules; |
1202 | if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)) | |
0f45aa18 | 1203 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
1204 | if (likely(state == AUDIT_DISABLED)) |
1205 | return; | |
1206 | ||
ce625a80 | 1207 | context->serial = 0; |
1da177e4 LT |
1208 | context->ctime = CURRENT_TIME; |
1209 | context->in_syscall = 1; | |
1210 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
419c58f1 | 1211 | context->ppid = 0; |
1da177e4 LT |
1212 | } |
1213 | ||
b0dd25a8 RD |
1214 | /** |
1215 | * audit_syscall_exit - deallocate audit context after a system call | |
1216 | * @tsk: task being audited | |
1217 | * @valid: success/failure flag | |
1218 | * @return_code: syscall return value | |
1219 | * | |
1220 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
1221 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
1222 | * filtering, or because some other part of the kernel write an audit | |
1223 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
1224 | * free the names stored from getname(). |
1225 | */ | |
5411be59 | 1226 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 1227 | { |
5411be59 | 1228 | struct task_struct *tsk = current; |
1da177e4 LT |
1229 | struct audit_context *context; |
1230 | ||
2fd6f58b | 1231 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 1232 | |
1da177e4 | 1233 | if (likely(!context)) |
97e94c45 | 1234 | return; |
1da177e4 | 1235 | |
f7056d64 | 1236 | if (context->in_syscall && context->auditable) |
e495149b | 1237 | audit_log_exit(context, tsk); |
1da177e4 LT |
1238 | |
1239 | context->in_syscall = 0; | |
1240 | context->auditable = 0; | |
2fd6f58b | 1241 | |
1da177e4 LT |
1242 | if (context->previous) { |
1243 | struct audit_context *new_context = context->previous; | |
1244 | context->previous = NULL; | |
1245 | audit_free_context(context); | |
1246 | tsk->audit_context = new_context; | |
1247 | } else { | |
1248 | audit_free_names(context); | |
1249 | audit_free_aux(context); | |
e54dc243 AG |
1250 | context->aux = NULL; |
1251 | context->aux_pids = NULL; | |
a5cb013d | 1252 | context->target_pid = 0; |
e54dc243 | 1253 | context->target_sid = 0; |
5adc8a6a AG |
1254 | kfree(context->filterkey); |
1255 | context->filterkey = NULL; | |
1da177e4 LT |
1256 | tsk->audit_context = context; |
1257 | } | |
1da177e4 LT |
1258 | } |
1259 | ||
b0dd25a8 RD |
1260 | /** |
1261 | * audit_getname - add a name to the list | |
1262 | * @name: name to add | |
1263 | * | |
1264 | * Add a name to the list of audit names for this context. | |
1265 | * Called from fs/namei.c:getname(). | |
1266 | */ | |
d8945bb5 | 1267 | void __audit_getname(const char *name) |
1da177e4 LT |
1268 | { |
1269 | struct audit_context *context = current->audit_context; | |
1270 | ||
d8945bb5 | 1271 | if (IS_ERR(name) || !name) |
1da177e4 LT |
1272 | return; |
1273 | ||
1274 | if (!context->in_syscall) { | |
1275 | #if AUDIT_DEBUG == 2 | |
1276 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1277 | __FILE__, __LINE__, context->serial, name); | |
1278 | dump_stack(); | |
1279 | #endif | |
1280 | return; | |
1281 | } | |
1282 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1283 | context->names[context->name_count].name = name; | |
9c937dcc AG |
1284 | context->names[context->name_count].name_len = AUDIT_NAME_FULL; |
1285 | context->names[context->name_count].name_put = 1; | |
1da177e4 | 1286 | context->names[context->name_count].ino = (unsigned long)-1; |
e41e8bde | 1287 | context->names[context->name_count].osid = 0; |
1da177e4 | 1288 | ++context->name_count; |
8f37d47c DW |
1289 | if (!context->pwd) { |
1290 | read_lock(¤t->fs->lock); | |
1291 | context->pwd = dget(current->fs->pwd); | |
1292 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1293 | read_unlock(¤t->fs->lock); | |
1294 | } | |
1295 | ||
1da177e4 LT |
1296 | } |
1297 | ||
b0dd25a8 RD |
1298 | /* audit_putname - intercept a putname request |
1299 | * @name: name to intercept and delay for putname | |
1300 | * | |
1301 | * If we have stored the name from getname in the audit context, | |
1302 | * then we delay the putname until syscall exit. | |
1303 | * Called from include/linux/fs.h:putname(). | |
1304 | */ | |
1da177e4 LT |
1305 | void audit_putname(const char *name) |
1306 | { | |
1307 | struct audit_context *context = current->audit_context; | |
1308 | ||
1309 | BUG_ON(!context); | |
1310 | if (!context->in_syscall) { | |
1311 | #if AUDIT_DEBUG == 2 | |
1312 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1313 | __FILE__, __LINE__, context->serial, name); | |
1314 | if (context->name_count) { | |
1315 | int i; | |
1316 | for (i = 0; i < context->name_count; i++) | |
1317 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1318 | context->names[i].name, | |
73241ccc | 1319 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
1320 | } |
1321 | #endif | |
1322 | __putname(name); | |
1323 | } | |
1324 | #if AUDIT_DEBUG | |
1325 | else { | |
1326 | ++context->put_count; | |
1327 | if (context->put_count > context->name_count) { | |
1328 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1329 | " in_syscall=%d putname(%p) name_count=%d" | |
1330 | " put_count=%d\n", | |
1331 | __FILE__, __LINE__, | |
1332 | context->serial, context->major, | |
1333 | context->in_syscall, name, context->name_count, | |
1334 | context->put_count); | |
1335 | dump_stack(); | |
1336 | } | |
1337 | } | |
1338 | #endif | |
1339 | } | |
1340 | ||
5712e88f AG |
1341 | static int audit_inc_name_count(struct audit_context *context, |
1342 | const struct inode *inode) | |
1343 | { | |
1344 | if (context->name_count >= AUDIT_NAMES) { | |
1345 | if (inode) | |
1346 | printk(KERN_DEBUG "name_count maxed, losing inode data: " | |
1347 | "dev=%02x:%02x, inode=%lu", | |
1348 | MAJOR(inode->i_sb->s_dev), | |
1349 | MINOR(inode->i_sb->s_dev), | |
1350 | inode->i_ino); | |
1351 | ||
1352 | else | |
1353 | printk(KERN_DEBUG "name_count maxed, losing inode data"); | |
1354 | return 1; | |
1355 | } | |
1356 | context->name_count++; | |
1357 | #if AUDIT_DEBUG | |
1358 | context->ino_count++; | |
1359 | #endif | |
1360 | return 0; | |
1361 | } | |
1362 | ||
3e2efce0 AG |
1363 | /* Copy inode data into an audit_names. */ |
1364 | static void audit_copy_inode(struct audit_names *name, const struct inode *inode) | |
8c8570fb | 1365 | { |
3e2efce0 AG |
1366 | name->ino = inode->i_ino; |
1367 | name->dev = inode->i_sb->s_dev; | |
1368 | name->mode = inode->i_mode; | |
1369 | name->uid = inode->i_uid; | |
1370 | name->gid = inode->i_gid; | |
1371 | name->rdev = inode->i_rdev; | |
1372 | selinux_get_inode_sid(inode, &name->osid); | |
8c8570fb DK |
1373 | } |
1374 | ||
b0dd25a8 RD |
1375 | /** |
1376 | * audit_inode - store the inode and device from a lookup | |
1377 | * @name: name being audited | |
1378 | * @inode: inode being audited | |
b0dd25a8 RD |
1379 | * |
1380 | * Called from fs/namei.c:path_lookup(). | |
1381 | */ | |
9c937dcc | 1382 | void __audit_inode(const char *name, const struct inode *inode) |
1da177e4 LT |
1383 | { |
1384 | int idx; | |
1385 | struct audit_context *context = current->audit_context; | |
1386 | ||
1387 | if (!context->in_syscall) | |
1388 | return; | |
1389 | if (context->name_count | |
1390 | && context->names[context->name_count-1].name | |
1391 | && context->names[context->name_count-1].name == name) | |
1392 | idx = context->name_count - 1; | |
1393 | else if (context->name_count > 1 | |
1394 | && context->names[context->name_count-2].name | |
1395 | && context->names[context->name_count-2].name == name) | |
1396 | idx = context->name_count - 2; | |
1397 | else { | |
1398 | /* FIXME: how much do we care about inodes that have no | |
1399 | * associated name? */ | |
5712e88f | 1400 | if (audit_inc_name_count(context, inode)) |
1da177e4 | 1401 | return; |
5712e88f | 1402 | idx = context->name_count - 1; |
1da177e4 | 1403 | context->names[idx].name = NULL; |
1da177e4 | 1404 | } |
3e2efce0 | 1405 | audit_copy_inode(&context->names[idx], inode); |
73241ccc AG |
1406 | } |
1407 | ||
1408 | /** | |
1409 | * audit_inode_child - collect inode info for created/removed objects | |
1410 | * @dname: inode's dentry name | |
1411 | * @inode: inode being audited | |
73d3ec5a | 1412 | * @parent: inode of dentry parent |
73241ccc AG |
1413 | * |
1414 | * For syscalls that create or remove filesystem objects, audit_inode | |
1415 | * can only collect information for the filesystem object's parent. | |
1416 | * This call updates the audit context with the child's information. | |
1417 | * Syscalls that create a new filesystem object must be hooked after | |
1418 | * the object is created. Syscalls that remove a filesystem object | |
1419 | * must be hooked prior, in order to capture the target inode during | |
1420 | * unsuccessful attempts. | |
1421 | */ | |
1422 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
73d3ec5a | 1423 | const struct inode *parent) |
73241ccc AG |
1424 | { |
1425 | int idx; | |
1426 | struct audit_context *context = current->audit_context; | |
5712e88f | 1427 | const char *found_parent = NULL, *found_child = NULL; |
9c937dcc | 1428 | int dirlen = 0; |
73241ccc AG |
1429 | |
1430 | if (!context->in_syscall) | |
1431 | return; | |
1432 | ||
1433 | /* determine matching parent */ | |
f368c07d | 1434 | if (!dname) |
5712e88f | 1435 | goto add_names; |
73241ccc | 1436 | |
5712e88f AG |
1437 | /* parent is more likely, look for it first */ |
1438 | for (idx = 0; idx < context->name_count; idx++) { | |
1439 | struct audit_names *n = &context->names[idx]; | |
f368c07d | 1440 | |
5712e88f AG |
1441 | if (!n->name) |
1442 | continue; | |
1443 | ||
1444 | if (n->ino == parent->i_ino && | |
1445 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1446 | n->name_len = dirlen; /* update parent data in place */ | |
1447 | found_parent = n->name; | |
1448 | goto add_names; | |
f368c07d | 1449 | } |
5712e88f | 1450 | } |
73241ccc | 1451 | |
5712e88f AG |
1452 | /* no matching parent, look for matching child */ |
1453 | for (idx = 0; idx < context->name_count; idx++) { | |
1454 | struct audit_names *n = &context->names[idx]; | |
1455 | ||
1456 | if (!n->name) | |
1457 | continue; | |
1458 | ||
1459 | /* strcmp() is the more likely scenario */ | |
1460 | if (!strcmp(dname, n->name) || | |
1461 | !audit_compare_dname_path(dname, n->name, &dirlen)) { | |
1462 | if (inode) | |
1463 | audit_copy_inode(n, inode); | |
1464 | else | |
1465 | n->ino = (unsigned long)-1; | |
1466 | found_child = n->name; | |
1467 | goto add_names; | |
1468 | } | |
ac9910ce | 1469 | } |
5712e88f AG |
1470 | |
1471 | add_names: | |
1472 | if (!found_parent) { | |
1473 | if (audit_inc_name_count(context, parent)) | |
ac9910ce | 1474 | return; |
5712e88f AG |
1475 | idx = context->name_count - 1; |
1476 | context->names[idx].name = NULL; | |
73d3ec5a AG |
1477 | audit_copy_inode(&context->names[idx], parent); |
1478 | } | |
5712e88f AG |
1479 | |
1480 | if (!found_child) { | |
1481 | if (audit_inc_name_count(context, inode)) | |
1482 | return; | |
1483 | idx = context->name_count - 1; | |
1484 | ||
1485 | /* Re-use the name belonging to the slot for a matching parent | |
1486 | * directory. All names for this context are relinquished in | |
1487 | * audit_free_names() */ | |
1488 | if (found_parent) { | |
1489 | context->names[idx].name = found_parent; | |
1490 | context->names[idx].name_len = AUDIT_NAME_FULL; | |
1491 | /* don't call __putname() */ | |
1492 | context->names[idx].name_put = 0; | |
1493 | } else { | |
1494 | context->names[idx].name = NULL; | |
1495 | } | |
1496 | ||
1497 | if (inode) | |
1498 | audit_copy_inode(&context->names[idx], inode); | |
1499 | else | |
1500 | context->names[idx].ino = (unsigned long)-1; | |
1501 | } | |
3e2efce0 AG |
1502 | } |
1503 | ||
b0dd25a8 RD |
1504 | /** |
1505 | * auditsc_get_stamp - get local copies of audit_context values | |
1506 | * @ctx: audit_context for the task | |
1507 | * @t: timespec to store time recorded in the audit_context | |
1508 | * @serial: serial value that is recorded in the audit_context | |
1509 | * | |
1510 | * Also sets the context as auditable. | |
1511 | */ | |
bfb4496e DW |
1512 | void auditsc_get_stamp(struct audit_context *ctx, |
1513 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1514 | { |
ce625a80 DW |
1515 | if (!ctx->serial) |
1516 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1517 | t->tv_sec = ctx->ctime.tv_sec; |
1518 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1519 | *serial = ctx->serial; | |
1520 | ctx->auditable = 1; | |
1da177e4 LT |
1521 | } |
1522 | ||
b0dd25a8 RD |
1523 | /** |
1524 | * audit_set_loginuid - set a task's audit_context loginuid | |
1525 | * @task: task whose audit context is being modified | |
1526 | * @loginuid: loginuid value | |
1527 | * | |
1528 | * Returns 0. | |
1529 | * | |
1530 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1531 | */ | |
456be6cd | 1532 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1533 | { |
41757106 SG |
1534 | struct audit_context *context = task->audit_context; |
1535 | ||
1536 | if (context) { | |
1537 | /* Only log if audit is enabled */ | |
1538 | if (context->in_syscall) { | |
1539 | struct audit_buffer *ab; | |
1540 | ||
1541 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); | |
1542 | if (ab) { | |
1543 | audit_log_format(ab, "login pid=%d uid=%u " | |
1544 | "old auid=%u new auid=%u", | |
1545 | task->pid, task->uid, | |
1546 | context->loginuid, loginuid); | |
1547 | audit_log_end(ab); | |
1548 | } | |
c0404993 | 1549 | } |
41757106 | 1550 | context->loginuid = loginuid; |
1da177e4 LT |
1551 | } |
1552 | return 0; | |
1553 | } | |
1554 | ||
b0dd25a8 RD |
1555 | /** |
1556 | * audit_get_loginuid - get the loginuid for an audit_context | |
1557 | * @ctx: the audit_context | |
1558 | * | |
1559 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1560 | */ | |
1da177e4 LT |
1561 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1562 | { | |
1563 | return ctx ? ctx->loginuid : -1; | |
1564 | } | |
1565 | ||
161a09e7 JL |
1566 | EXPORT_SYMBOL(audit_get_loginuid); |
1567 | ||
20ca73bc GW |
1568 | /** |
1569 | * __audit_mq_open - record audit data for a POSIX MQ open | |
1570 | * @oflag: open flag | |
1571 | * @mode: mode bits | |
1572 | * @u_attr: queue attributes | |
1573 | * | |
1574 | * Returns 0 for success or NULL context or < 0 on error. | |
1575 | */ | |
1576 | int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr) | |
1577 | { | |
1578 | struct audit_aux_data_mq_open *ax; | |
1579 | struct audit_context *context = current->audit_context; | |
1580 | ||
1581 | if (!audit_enabled) | |
1582 | return 0; | |
1583 | ||
1584 | if (likely(!context)) | |
1585 | return 0; | |
1586 | ||
1587 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1588 | if (!ax) | |
1589 | return -ENOMEM; | |
1590 | ||
1591 | if (u_attr != NULL) { | |
1592 | if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) { | |
1593 | kfree(ax); | |
1594 | return -EFAULT; | |
1595 | } | |
1596 | } else | |
1597 | memset(&ax->attr, 0, sizeof(ax->attr)); | |
1598 | ||
1599 | ax->oflag = oflag; | |
1600 | ax->mode = mode; | |
1601 | ||
1602 | ax->d.type = AUDIT_MQ_OPEN; | |
1603 | ax->d.next = context->aux; | |
1604 | context->aux = (void *)ax; | |
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * __audit_mq_timedsend - record audit data for a POSIX MQ timed send | |
1610 | * @mqdes: MQ descriptor | |
1611 | * @msg_len: Message length | |
1612 | * @msg_prio: Message priority | |
1dbe83c3 | 1613 | * @u_abs_timeout: Message timeout in absolute time |
20ca73bc GW |
1614 | * |
1615 | * Returns 0 for success or NULL context or < 0 on error. | |
1616 | */ | |
1617 | int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, | |
1618 | const struct timespec __user *u_abs_timeout) | |
1619 | { | |
1620 | struct audit_aux_data_mq_sendrecv *ax; | |
1621 | struct audit_context *context = current->audit_context; | |
1622 | ||
1623 | if (!audit_enabled) | |
1624 | return 0; | |
1625 | ||
1626 | if (likely(!context)) | |
1627 | return 0; | |
1628 | ||
1629 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1630 | if (!ax) | |
1631 | return -ENOMEM; | |
1632 | ||
1633 | if (u_abs_timeout != NULL) { | |
1634 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1635 | kfree(ax); | |
1636 | return -EFAULT; | |
1637 | } | |
1638 | } else | |
1639 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1640 | ||
1641 | ax->mqdes = mqdes; | |
1642 | ax->msg_len = msg_len; | |
1643 | ax->msg_prio = msg_prio; | |
1644 | ||
1645 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1646 | ax->d.next = context->aux; | |
1647 | context->aux = (void *)ax; | |
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive | |
1653 | * @mqdes: MQ descriptor | |
1654 | * @msg_len: Message length | |
1dbe83c3 RD |
1655 | * @u_msg_prio: Message priority |
1656 | * @u_abs_timeout: Message timeout in absolute time | |
20ca73bc GW |
1657 | * |
1658 | * Returns 0 for success or NULL context or < 0 on error. | |
1659 | */ | |
1660 | int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, | |
1661 | unsigned int __user *u_msg_prio, | |
1662 | const struct timespec __user *u_abs_timeout) | |
1663 | { | |
1664 | struct audit_aux_data_mq_sendrecv *ax; | |
1665 | struct audit_context *context = current->audit_context; | |
1666 | ||
1667 | if (!audit_enabled) | |
1668 | return 0; | |
1669 | ||
1670 | if (likely(!context)) | |
1671 | return 0; | |
1672 | ||
1673 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1674 | if (!ax) | |
1675 | return -ENOMEM; | |
1676 | ||
1677 | if (u_msg_prio != NULL) { | |
1678 | if (get_user(ax->msg_prio, u_msg_prio)) { | |
1679 | kfree(ax); | |
1680 | return -EFAULT; | |
1681 | } | |
1682 | } else | |
1683 | ax->msg_prio = 0; | |
1684 | ||
1685 | if (u_abs_timeout != NULL) { | |
1686 | if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) { | |
1687 | kfree(ax); | |
1688 | return -EFAULT; | |
1689 | } | |
1690 | } else | |
1691 | memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout)); | |
1692 | ||
1693 | ax->mqdes = mqdes; | |
1694 | ax->msg_len = msg_len; | |
1695 | ||
1696 | ax->d.type = AUDIT_MQ_SENDRECV; | |
1697 | ax->d.next = context->aux; | |
1698 | context->aux = (void *)ax; | |
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | /** | |
1703 | * __audit_mq_notify - record audit data for a POSIX MQ notify | |
1704 | * @mqdes: MQ descriptor | |
1705 | * @u_notification: Notification event | |
1706 | * | |
1707 | * Returns 0 for success or NULL context or < 0 on error. | |
1708 | */ | |
1709 | ||
1710 | int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification) | |
1711 | { | |
1712 | struct audit_aux_data_mq_notify *ax; | |
1713 | struct audit_context *context = current->audit_context; | |
1714 | ||
1715 | if (!audit_enabled) | |
1716 | return 0; | |
1717 | ||
1718 | if (likely(!context)) | |
1719 | return 0; | |
1720 | ||
1721 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1722 | if (!ax) | |
1723 | return -ENOMEM; | |
1724 | ||
1725 | if (u_notification != NULL) { | |
1726 | if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) { | |
1727 | kfree(ax); | |
1728 | return -EFAULT; | |
1729 | } | |
1730 | } else | |
1731 | memset(&ax->notification, 0, sizeof(ax->notification)); | |
1732 | ||
1733 | ax->mqdes = mqdes; | |
1734 | ||
1735 | ax->d.type = AUDIT_MQ_NOTIFY; | |
1736 | ax->d.next = context->aux; | |
1737 | context->aux = (void *)ax; | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute | |
1743 | * @mqdes: MQ descriptor | |
1744 | * @mqstat: MQ flags | |
1745 | * | |
1746 | * Returns 0 for success or NULL context or < 0 on error. | |
1747 | */ | |
1748 | int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) | |
1749 | { | |
1750 | struct audit_aux_data_mq_getsetattr *ax; | |
1751 | struct audit_context *context = current->audit_context; | |
1752 | ||
1753 | if (!audit_enabled) | |
1754 | return 0; | |
1755 | ||
1756 | if (likely(!context)) | |
1757 | return 0; | |
1758 | ||
1759 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1760 | if (!ax) | |
1761 | return -ENOMEM; | |
1762 | ||
1763 | ax->mqdes = mqdes; | |
1764 | ax->mqstat = *mqstat; | |
1765 | ||
1766 | ax->d.type = AUDIT_MQ_GETSETATTR; | |
1767 | ax->d.next = context->aux; | |
1768 | context->aux = (void *)ax; | |
1769 | return 0; | |
1770 | } | |
1771 | ||
b0dd25a8 | 1772 | /** |
073115d6 SG |
1773 | * audit_ipc_obj - record audit data for ipc object |
1774 | * @ipcp: ipc permissions | |
1775 | * | |
1776 | * Returns 0 for success or NULL context or < 0 on error. | |
1777 | */ | |
d8945bb5 | 1778 | int __audit_ipc_obj(struct kern_ipc_perm *ipcp) |
073115d6 SG |
1779 | { |
1780 | struct audit_aux_data_ipcctl *ax; | |
1781 | struct audit_context *context = current->audit_context; | |
1782 | ||
073115d6 SG |
1783 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1784 | if (!ax) | |
1785 | return -ENOMEM; | |
1786 | ||
1787 | ax->uid = ipcp->uid; | |
1788 | ax->gid = ipcp->gid; | |
1789 | ax->mode = ipcp->mode; | |
1790 | selinux_get_ipc_sid(ipcp, &ax->osid); | |
1791 | ||
1792 | ax->d.type = AUDIT_IPC; | |
1793 | ax->d.next = context->aux; | |
1794 | context->aux = (void *)ax; | |
1795 | return 0; | |
1796 | } | |
1797 | ||
1798 | /** | |
1799 | * audit_ipc_set_perm - record audit data for new ipc permissions | |
b0dd25a8 RD |
1800 | * @qbytes: msgq bytes |
1801 | * @uid: msgq user id | |
1802 | * @gid: msgq group id | |
1803 | * @mode: msgq mode (permissions) | |
1804 | * | |
1805 | * Returns 0 for success or NULL context or < 0 on error. | |
1806 | */ | |
d8945bb5 | 1807 | int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) |
1da177e4 LT |
1808 | { |
1809 | struct audit_aux_data_ipcctl *ax; | |
1810 | struct audit_context *context = current->audit_context; | |
1811 | ||
8c8570fb | 1812 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1813 | if (!ax) |
1814 | return -ENOMEM; | |
1815 | ||
1816 | ax->qbytes = qbytes; | |
1817 | ax->uid = uid; | |
1818 | ax->gid = gid; | |
1819 | ax->mode = mode; | |
1820 | ||
073115d6 | 1821 | ax->d.type = AUDIT_IPC_SET_PERM; |
1da177e4 LT |
1822 | ax->d.next = context->aux; |
1823 | context->aux = (void *)ax; | |
1824 | return 0; | |
1825 | } | |
c2f0c7c3 | 1826 | |
473ae30b AV |
1827 | int audit_bprm(struct linux_binprm *bprm) |
1828 | { | |
1829 | struct audit_aux_data_execve *ax; | |
1830 | struct audit_context *context = current->audit_context; | |
1831 | unsigned long p, next; | |
1832 | void *to; | |
1833 | ||
5ac3a9c2 | 1834 | if (likely(!audit_enabled || !context || context->dummy)) |
473ae30b AV |
1835 | return 0; |
1836 | ||
1837 | ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, | |
1838 | GFP_KERNEL); | |
1839 | if (!ax) | |
1840 | return -ENOMEM; | |
1841 | ||
1842 | ax->argc = bprm->argc; | |
1843 | ax->envc = bprm->envc; | |
1844 | for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { | |
1845 | struct page *page = bprm->page[p / PAGE_SIZE]; | |
1846 | void *kaddr = kmap(page); | |
1847 | next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); | |
1848 | memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); | |
1849 | to += next - p; | |
1850 | kunmap(page); | |
1851 | } | |
1852 | ||
1853 | ax->d.type = AUDIT_EXECVE; | |
1854 | ax->d.next = context->aux; | |
1855 | context->aux = (void *)ax; | |
1856 | return 0; | |
1857 | } | |
1858 | ||
1859 | ||
b0dd25a8 RD |
1860 | /** |
1861 | * audit_socketcall - record audit data for sys_socketcall | |
1862 | * @nargs: number of args | |
1863 | * @args: args array | |
1864 | * | |
1865 | * Returns 0 for success or NULL context or < 0 on error. | |
1866 | */ | |
3ec3b2fb DW |
1867 | int audit_socketcall(int nargs, unsigned long *args) |
1868 | { | |
1869 | struct audit_aux_data_socketcall *ax; | |
1870 | struct audit_context *context = current->audit_context; | |
1871 | ||
5ac3a9c2 | 1872 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1873 | return 0; |
1874 | ||
1875 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1876 | if (!ax) | |
1877 | return -ENOMEM; | |
1878 | ||
1879 | ax->nargs = nargs; | |
1880 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1881 | ||
1882 | ax->d.type = AUDIT_SOCKETCALL; | |
1883 | ax->d.next = context->aux; | |
1884 | context->aux = (void *)ax; | |
1885 | return 0; | |
1886 | } | |
1887 | ||
db349509 AV |
1888 | /** |
1889 | * __audit_fd_pair - record audit data for pipe and socketpair | |
1890 | * @fd1: the first file descriptor | |
1891 | * @fd2: the second file descriptor | |
1892 | * | |
1893 | * Returns 0 for success or NULL context or < 0 on error. | |
1894 | */ | |
1895 | int __audit_fd_pair(int fd1, int fd2) | |
1896 | { | |
1897 | struct audit_context *context = current->audit_context; | |
1898 | struct audit_aux_data_fd_pair *ax; | |
1899 | ||
1900 | if (likely(!context)) { | |
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1905 | if (!ax) { | |
1906 | return -ENOMEM; | |
1907 | } | |
1908 | ||
1909 | ax->fd[0] = fd1; | |
1910 | ax->fd[1] = fd2; | |
1911 | ||
1912 | ax->d.type = AUDIT_FD_PAIR; | |
1913 | ax->d.next = context->aux; | |
1914 | context->aux = (void *)ax; | |
1915 | return 0; | |
1916 | } | |
1917 | ||
b0dd25a8 RD |
1918 | /** |
1919 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1920 | * @len: data length in user space | |
1921 | * @a: data address in kernel space | |
1922 | * | |
1923 | * Returns 0 for success or NULL context or < 0 on error. | |
1924 | */ | |
3ec3b2fb DW |
1925 | int audit_sockaddr(int len, void *a) |
1926 | { | |
1927 | struct audit_aux_data_sockaddr *ax; | |
1928 | struct audit_context *context = current->audit_context; | |
1929 | ||
5ac3a9c2 | 1930 | if (likely(!context || context->dummy)) |
3ec3b2fb DW |
1931 | return 0; |
1932 | ||
1933 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1934 | if (!ax) | |
1935 | return -ENOMEM; | |
1936 | ||
1937 | ax->len = len; | |
1938 | memcpy(ax->a, a, len); | |
1939 | ||
1940 | ax->d.type = AUDIT_SOCKADDR; | |
1941 | ax->d.next = context->aux; | |
1942 | context->aux = (void *)ax; | |
1943 | return 0; | |
1944 | } | |
1945 | ||
a5cb013d AV |
1946 | void __audit_ptrace(struct task_struct *t) |
1947 | { | |
1948 | struct audit_context *context = current->audit_context; | |
1949 | ||
1950 | context->target_pid = t->pid; | |
1951 | selinux_get_task_sid(t, &context->target_sid); | |
1952 | } | |
1953 | ||
b0dd25a8 RD |
1954 | /** |
1955 | * audit_avc_path - record the granting or denial of permissions | |
1956 | * @dentry: dentry to record | |
1957 | * @mnt: mnt to record | |
1958 | * | |
1959 | * Returns 0 for success or NULL context or < 0 on error. | |
1960 | * | |
1961 | * Called from security/selinux/avc.c::avc_audit() | |
1962 | */ | |
01116105 SS |
1963 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1964 | { | |
1965 | struct audit_aux_data_path *ax; | |
1966 | struct audit_context *context = current->audit_context; | |
1967 | ||
1968 | if (likely(!context)) | |
1969 | return 0; | |
1970 | ||
1971 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1972 | if (!ax) | |
1973 | return -ENOMEM; | |
1974 | ||
1975 | ax->dentry = dget(dentry); | |
1976 | ax->mnt = mntget(mnt); | |
1977 | ||
1978 | ax->d.type = AUDIT_AVC_PATH; | |
1979 | ax->d.next = context->aux; | |
1980 | context->aux = (void *)ax; | |
1981 | return 0; | |
1982 | } | |
1983 | ||
b0dd25a8 RD |
1984 | /** |
1985 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1986 | * @sig: signal value | |
1987 | * @t: task being signaled | |
1988 | * | |
1989 | * If the audit subsystem is being terminated, record the task (pid) | |
1990 | * and uid that is doing that. | |
1991 | */ | |
e54dc243 | 1992 | int __audit_signal_info(int sig, struct task_struct *t) |
c2f0c7c3 | 1993 | { |
e54dc243 AG |
1994 | struct audit_aux_data_pids *axp; |
1995 | struct task_struct *tsk = current; | |
1996 | struct audit_context *ctx = tsk->audit_context; | |
c2f0c7c3 SG |
1997 | extern pid_t audit_sig_pid; |
1998 | extern uid_t audit_sig_uid; | |
e1396065 AV |
1999 | extern u32 audit_sig_sid; |
2000 | ||
e54dc243 AG |
2001 | if (audit_pid && t->tgid == audit_pid && |
2002 | (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1)) { | |
e1396065 AV |
2003 | audit_sig_pid = tsk->pid; |
2004 | if (ctx) | |
2005 | audit_sig_uid = ctx->loginuid; | |
2006 | else | |
2007 | audit_sig_uid = tsk->uid; | |
2008 | selinux_get_task_sid(tsk, &audit_sig_sid); | |
c2f0c7c3 | 2009 | } |
e54dc243 AG |
2010 | |
2011 | if (!audit_signals) /* audit_context checked in wrapper */ | |
2012 | return 0; | |
2013 | ||
2014 | /* optimize the common case by putting first signal recipient directly | |
2015 | * in audit_context */ | |
2016 | if (!ctx->target_pid) { | |
2017 | ctx->target_pid = t->tgid; | |
2018 | selinux_get_task_sid(t, &ctx->target_sid); | |
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | axp = (void *)ctx->aux_pids; | |
2023 | if (!axp || axp->pid_count == AUDIT_AUX_PIDS) { | |
2024 | axp = kzalloc(sizeof(*axp), GFP_ATOMIC); | |
2025 | if (!axp) | |
2026 | return -ENOMEM; | |
2027 | ||
2028 | axp->d.type = AUDIT_OBJ_PID; | |
2029 | axp->d.next = ctx->aux_pids; | |
2030 | ctx->aux_pids = (void *)axp; | |
2031 | } | |
2032 | BUG_ON(axp->pid_count > AUDIT_AUX_PIDS); | |
2033 | ||
2034 | axp->target_pid[axp->pid_count] = t->tgid; | |
2035 | selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]); | |
2036 | axp->pid_count++; | |
2037 | ||
2038 | return 0; | |
c2f0c7c3 | 2039 | } |
0a4ff8c2 SG |
2040 | |
2041 | /** | |
2042 | * audit_core_dumps - record information about processes that end abnormally | |
2043 | * @sig: signal value | |
2044 | * | |
2045 | * If a process ends with a core dump, something fishy is going on and we | |
2046 | * should record the event for investigation. | |
2047 | */ | |
2048 | void audit_core_dumps(long signr) | |
2049 | { | |
2050 | struct audit_buffer *ab; | |
2051 | u32 sid; | |
2052 | ||
2053 | if (!audit_enabled) | |
2054 | return; | |
2055 | ||
2056 | if (signr == SIGQUIT) /* don't care for those */ | |
2057 | return; | |
2058 | ||
2059 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); | |
2060 | audit_log_format(ab, "auid=%u uid=%u gid=%u", | |
2061 | audit_get_loginuid(current->audit_context), | |
2062 | current->uid, current->gid); | |
2063 | selinux_get_task_sid(current, &sid); | |
2064 | if (sid) { | |
2065 | char *ctx = NULL; | |
2066 | u32 len; | |
2067 | ||
2068 | if (selinux_sid_to_string(sid, &ctx, &len)) | |
2069 | audit_log_format(ab, " ssid=%u", sid); | |
2070 | else | |
2071 | audit_log_format(ab, " subj=%s", ctx); | |
2072 | kfree(ctx); | |
2073 | } | |
2074 | audit_log_format(ab, " pid=%d comm=", current->pid); | |
2075 | audit_log_untrustedstring(ab, current->comm); | |
2076 | audit_log_format(ab, " sig=%ld", signr); | |
2077 | audit_log_end(ab); | |
2078 | } |