Merge tag 'trace-fixes-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux-2.6-block.git] / kernel / auditsc.c
CommitLineData
85c8721f 1/* auditsc.c -- System-call auditing support
1da177e4
LT
2 * Handles all system-call specific auditing features.
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
73241ccc 5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
20ca73bc 6 * Copyright (C) 2005, 2006 IBM Corporation
1da177e4
LT
7 * All Rights Reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
24 *
25 * Many of the ideas implemented here are from Stephen C. Tweedie,
26 * especially the idea of avoiding a copy by using getname.
27 *
28 * The method for actual interception of syscall entry and exit (not in
29 * this file -- see entry.S) is based on a GPL'd patch written by
30 * okir@suse.de and Copyright 2003 SuSE Linux AG.
31 *
20ca73bc
GW
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
33 * 2006.
34 *
b63862f4
DK
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
37 *
73241ccc
AG
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
8c8570fb
DK
40 *
41 * Subject and object context labeling support added by <danjones@us.ibm.com>
42 * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
1da177e4
LT
43 */
44
45#include <linux/init.h>
1da177e4 46#include <asm/types.h>
60063497 47#include <linux/atomic.h>
73241ccc
AG
48#include <linux/fs.h>
49#include <linux/namei.h>
1da177e4 50#include <linux/mm.h>
9984de1a 51#include <linux/export.h>
5a0e3ad6 52#include <linux/slab.h>
01116105 53#include <linux/mount.h>
3ec3b2fb 54#include <linux/socket.h>
20ca73bc 55#include <linux/mqueue.h>
1da177e4
LT
56#include <linux/audit.h>
57#include <linux/personality.h>
58#include <linux/time.h>
5bb289b5 59#include <linux/netlink.h>
f5561964 60#include <linux/compiler.h>
1da177e4 61#include <asm/unistd.h>
8c8570fb 62#include <linux/security.h>
fe7752ba 63#include <linux/list.h>
a6c043a8 64#include <linux/tty.h>
473ae30b 65#include <linux/binfmts.h>
a1f8e7f7 66#include <linux/highmem.h>
f46038ff 67#include <linux/syscalls.h>
851f7ff5 68#include <linux/capability.h>
5ad4e53b 69#include <linux/fs_struct.h>
3dc1c1b2 70#include <linux/compat.h>
1da177e4 71
fe7752ba 72#include "audit.h"
1da177e4 73
d7e7528b
EP
74/* flags stating the success for a syscall */
75#define AUDITSC_INVALID 0
76#define AUDITSC_SUCCESS 1
77#define AUDITSC_FAILURE 2
78
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 */
83int audit_n_rules;
84
e54dc243
AG
85/* determines whether we collect data for signals sent */
86int audit_signals;
87
1da177e4
LT
88struct audit_aux_data {
89 struct audit_aux_data *next;
90 int type;
91};
92
93#define AUDIT_AUX_IPCPERM 0
94
e54dc243
AG
95/* Number of target pids per aux struct. */
96#define AUDIT_AUX_PIDS 16
97
e54dc243
AG
98struct audit_aux_data_pids {
99 struct audit_aux_data d;
100 pid_t target_pid[AUDIT_AUX_PIDS];
e1760bd5 101 kuid_t target_auid[AUDIT_AUX_PIDS];
cca080d9 102 kuid_t target_uid[AUDIT_AUX_PIDS];
4746ec5b 103 unsigned int target_sessionid[AUDIT_AUX_PIDS];
e54dc243 104 u32 target_sid[AUDIT_AUX_PIDS];
c2a7780e 105 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
e54dc243
AG
106 int pid_count;
107};
108
3fc689e9
EP
109struct audit_aux_data_bprm_fcaps {
110 struct audit_aux_data d;
111 struct audit_cap_data fcap;
112 unsigned int fcap_ver;
113 struct audit_cap_data old_pcap;
114 struct audit_cap_data new_pcap;
115};
116
74c3cbe3
AV
117struct audit_tree_refs {
118 struct audit_tree_refs *next;
119 struct audit_chunk *c[31];
120};
121
55669bfa
AV
122static inline int open_arg(int flags, int mask)
123{
124 int n = ACC_MODE(flags);
125 if (flags & (O_TRUNC | O_CREAT))
126 n |= AUDIT_PERM_WRITE;
127 return n & mask;
128}
129
130static int audit_match_perm(struct audit_context *ctx, int mask)
131{
c4bacefb 132 unsigned n;
1a61c88d 133 if (unlikely(!ctx))
134 return 0;
c4bacefb 135 n = ctx->major;
dbda4c0b 136
55669bfa
AV
137 switch (audit_classify_syscall(ctx->arch, n)) {
138 case 0: /* native */
139 if ((mask & AUDIT_PERM_WRITE) &&
140 audit_match_class(AUDIT_CLASS_WRITE, n))
141 return 1;
142 if ((mask & AUDIT_PERM_READ) &&
143 audit_match_class(AUDIT_CLASS_READ, n))
144 return 1;
145 if ((mask & AUDIT_PERM_ATTR) &&
146 audit_match_class(AUDIT_CLASS_CHATTR, n))
147 return 1;
148 return 0;
149 case 1: /* 32bit on biarch */
150 if ((mask & AUDIT_PERM_WRITE) &&
151 audit_match_class(AUDIT_CLASS_WRITE_32, n))
152 return 1;
153 if ((mask & AUDIT_PERM_READ) &&
154 audit_match_class(AUDIT_CLASS_READ_32, n))
155 return 1;
156 if ((mask & AUDIT_PERM_ATTR) &&
157 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
158 return 1;
159 return 0;
160 case 2: /* open */
161 return mask & ACC_MODE(ctx->argv[1]);
162 case 3: /* openat */
163 return mask & ACC_MODE(ctx->argv[2]);
164 case 4: /* socketcall */
165 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
166 case 5: /* execve */
167 return mask & AUDIT_PERM_EXEC;
168 default:
169 return 0;
170 }
171}
172
5ef30ee5 173static int audit_match_filetype(struct audit_context *ctx, int val)
8b67dca9 174{
5195d8e2 175 struct audit_names *n;
5ef30ee5 176 umode_t mode = (umode_t)val;
1a61c88d 177
178 if (unlikely(!ctx))
179 return 0;
180
5195d8e2
EP
181 list_for_each_entry(n, &ctx->names_list, list) {
182 if ((n->ino != -1) &&
183 ((n->mode & S_IFMT) == mode))
5ef30ee5
EP
184 return 1;
185 }
5195d8e2 186
5ef30ee5 187 return 0;
8b67dca9
AV
188}
189
74c3cbe3
AV
190/*
191 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
192 * ->first_trees points to its beginning, ->trees - to the current end of data.
193 * ->tree_count is the number of free entries in array pointed to by ->trees.
194 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
195 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
196 * it's going to remain 1-element for almost any setup) until we free context itself.
197 * References in it _are_ dropped - at the same time we free/drop aux stuff.
198 */
199
200#ifdef CONFIG_AUDIT_TREE
679173b7
EP
201static void audit_set_auditable(struct audit_context *ctx)
202{
203 if (!ctx->prio) {
204 ctx->prio = 1;
205 ctx->current_state = AUDIT_RECORD_CONTEXT;
206 }
207}
208
74c3cbe3
AV
209static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
210{
211 struct audit_tree_refs *p = ctx->trees;
212 int left = ctx->tree_count;
213 if (likely(left)) {
214 p->c[--left] = chunk;
215 ctx->tree_count = left;
216 return 1;
217 }
218 if (!p)
219 return 0;
220 p = p->next;
221 if (p) {
222 p->c[30] = chunk;
223 ctx->trees = p;
224 ctx->tree_count = 30;
225 return 1;
226 }
227 return 0;
228}
229
230static int grow_tree_refs(struct audit_context *ctx)
231{
232 struct audit_tree_refs *p = ctx->trees;
233 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
234 if (!ctx->trees) {
235 ctx->trees = p;
236 return 0;
237 }
238 if (p)
239 p->next = ctx->trees;
240 else
241 ctx->first_trees = ctx->trees;
242 ctx->tree_count = 31;
243 return 1;
244}
245#endif
246
247static void unroll_tree_refs(struct audit_context *ctx,
248 struct audit_tree_refs *p, int count)
249{
250#ifdef CONFIG_AUDIT_TREE
251 struct audit_tree_refs *q;
252 int n;
253 if (!p) {
254 /* we started with empty chain */
255 p = ctx->first_trees;
256 count = 31;
257 /* if the very first allocation has failed, nothing to do */
258 if (!p)
259 return;
260 }
261 n = count;
262 for (q = p; q != ctx->trees; q = q->next, n = 31) {
263 while (n--) {
264 audit_put_chunk(q->c[n]);
265 q->c[n] = NULL;
266 }
267 }
268 while (n-- > ctx->tree_count) {
269 audit_put_chunk(q->c[n]);
270 q->c[n] = NULL;
271 }
272 ctx->trees = p;
273 ctx->tree_count = count;
274#endif
275}
276
277static void free_tree_refs(struct audit_context *ctx)
278{
279 struct audit_tree_refs *p, *q;
280 for (p = ctx->first_trees; p; p = q) {
281 q = p->next;
282 kfree(p);
283 }
284}
285
286static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
287{
288#ifdef CONFIG_AUDIT_TREE
289 struct audit_tree_refs *p;
290 int n;
291 if (!tree)
292 return 0;
293 /* full ones */
294 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
295 for (n = 0; n < 31; n++)
296 if (audit_tree_match(p->c[n], tree))
297 return 1;
298 }
299 /* partial */
300 if (p) {
301 for (n = ctx->tree_count; n < 31; n++)
302 if (audit_tree_match(p->c[n], tree))
303 return 1;
304 }
305#endif
306 return 0;
307}
308
ca57ec0f
EB
309static int audit_compare_uid(kuid_t uid,
310 struct audit_names *name,
311 struct audit_field *f,
312 struct audit_context *ctx)
b34b0393
EP
313{
314 struct audit_names *n;
b34b0393 315 int rc;
ca57ec0f 316
b34b0393 317 if (name) {
ca57ec0f 318 rc = audit_uid_comparator(uid, f->op, name->uid);
b34b0393
EP
319 if (rc)
320 return rc;
321 }
ca57ec0f 322
b34b0393
EP
323 if (ctx) {
324 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f
EB
325 rc = audit_uid_comparator(uid, f->op, n->uid);
326 if (rc)
327 return rc;
328 }
329 }
330 return 0;
331}
b34b0393 332
ca57ec0f
EB
333static int audit_compare_gid(kgid_t gid,
334 struct audit_names *name,
335 struct audit_field *f,
336 struct audit_context *ctx)
337{
338 struct audit_names *n;
339 int rc;
340
341 if (name) {
342 rc = audit_gid_comparator(gid, f->op, name->gid);
343 if (rc)
344 return rc;
345 }
346
347 if (ctx) {
348 list_for_each_entry(n, &ctx->names_list, list) {
349 rc = audit_gid_comparator(gid, f->op, n->gid);
b34b0393
EP
350 if (rc)
351 return rc;
352 }
353 }
354 return 0;
355}
356
02d86a56
EP
357static int audit_field_compare(struct task_struct *tsk,
358 const struct cred *cred,
359 struct audit_field *f,
360 struct audit_context *ctx,
361 struct audit_names *name)
362{
02d86a56 363 switch (f->val) {
4a6633ed 364 /* process to file object comparisons */
02d86a56 365 case AUDIT_COMPARE_UID_TO_OBJ_UID:
ca57ec0f 366 return audit_compare_uid(cred->uid, name, f, ctx);
c9fe685f 367 case AUDIT_COMPARE_GID_TO_OBJ_GID:
ca57ec0f 368 return audit_compare_gid(cred->gid, name, f, ctx);
4a6633ed 369 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
ca57ec0f 370 return audit_compare_uid(cred->euid, name, f, ctx);
4a6633ed 371 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
ca57ec0f 372 return audit_compare_gid(cred->egid, name, f, ctx);
4a6633ed 373 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
ca57ec0f 374 return audit_compare_uid(tsk->loginuid, name, f, ctx);
4a6633ed 375 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
ca57ec0f 376 return audit_compare_uid(cred->suid, name, f, ctx);
4a6633ed 377 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
ca57ec0f 378 return audit_compare_gid(cred->sgid, name, f, ctx);
4a6633ed 379 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
ca57ec0f 380 return audit_compare_uid(cred->fsuid, name, f, ctx);
4a6633ed 381 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
ca57ec0f 382 return audit_compare_gid(cred->fsgid, name, f, ctx);
10d68360
PM
383 /* uid comparisons */
384 case AUDIT_COMPARE_UID_TO_AUID:
ca57ec0f 385 return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
10d68360 386 case AUDIT_COMPARE_UID_TO_EUID:
ca57ec0f 387 return audit_uid_comparator(cred->uid, f->op, cred->euid);
10d68360 388 case AUDIT_COMPARE_UID_TO_SUID:
ca57ec0f 389 return audit_uid_comparator(cred->uid, f->op, cred->suid);
10d68360 390 case AUDIT_COMPARE_UID_TO_FSUID:
ca57ec0f 391 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
10d68360
PM
392 /* auid comparisons */
393 case AUDIT_COMPARE_AUID_TO_EUID:
ca57ec0f 394 return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
10d68360 395 case AUDIT_COMPARE_AUID_TO_SUID:
ca57ec0f 396 return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
10d68360 397 case AUDIT_COMPARE_AUID_TO_FSUID:
ca57ec0f 398 return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
10d68360
PM
399 /* euid comparisons */
400 case AUDIT_COMPARE_EUID_TO_SUID:
ca57ec0f 401 return audit_uid_comparator(cred->euid, f->op, cred->suid);
10d68360 402 case AUDIT_COMPARE_EUID_TO_FSUID:
ca57ec0f 403 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
10d68360
PM
404 /* suid comparisons */
405 case AUDIT_COMPARE_SUID_TO_FSUID:
ca57ec0f 406 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
10d68360
PM
407 /* gid comparisons */
408 case AUDIT_COMPARE_GID_TO_EGID:
ca57ec0f 409 return audit_gid_comparator(cred->gid, f->op, cred->egid);
10d68360 410 case AUDIT_COMPARE_GID_TO_SGID:
ca57ec0f 411 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
10d68360 412 case AUDIT_COMPARE_GID_TO_FSGID:
ca57ec0f 413 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
10d68360
PM
414 /* egid comparisons */
415 case AUDIT_COMPARE_EGID_TO_SGID:
ca57ec0f 416 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
10d68360 417 case AUDIT_COMPARE_EGID_TO_FSGID:
ca57ec0f 418 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
10d68360
PM
419 /* sgid comparison */
420 case AUDIT_COMPARE_SGID_TO_FSGID:
ca57ec0f 421 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
02d86a56
EP
422 default:
423 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
424 return 0;
425 }
426 return 0;
427}
428
f368c07d 429/* Determine if any context name data matches a rule's watch data */
1da177e4 430/* Compare a task_struct with an audit_rule. Return 1 on match, 0
f5629883
TJ
431 * otherwise.
432 *
433 * If task_creation is true, this is an explicit indication that we are
434 * filtering a task rule at task creation time. This and tsk == current are
435 * the only situations where tsk->cred may be accessed without an rcu read lock.
436 */
1da177e4 437static int audit_filter_rules(struct task_struct *tsk,
93315ed6 438 struct audit_krule *rule,
1da177e4 439 struct audit_context *ctx,
f368c07d 440 struct audit_names *name,
f5629883
TJ
441 enum audit_state *state,
442 bool task_creation)
1da177e4 443{
f5629883 444 const struct cred *cred;
5195d8e2 445 int i, need_sid = 1;
3dc7e315
DG
446 u32 sid;
447
f5629883
TJ
448 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
449
1da177e4 450 for (i = 0; i < rule->field_count; i++) {
93315ed6 451 struct audit_field *f = &rule->fields[i];
5195d8e2 452 struct audit_names *n;
1da177e4
LT
453 int result = 0;
454
93315ed6 455 switch (f->type) {
1da177e4 456 case AUDIT_PID:
93315ed6 457 result = audit_comparator(tsk->pid, f->op, f->val);
1da177e4 458 break;
3c66251e 459 case AUDIT_PPID:
419c58f1
AV
460 if (ctx) {
461 if (!ctx->ppid)
462 ctx->ppid = sys_getppid();
3c66251e 463 result = audit_comparator(ctx->ppid, f->op, f->val);
419c58f1 464 }
3c66251e 465 break;
1da177e4 466 case AUDIT_UID:
ca57ec0f 467 result = audit_uid_comparator(cred->uid, f->op, f->uid);
1da177e4
LT
468 break;
469 case AUDIT_EUID:
ca57ec0f 470 result = audit_uid_comparator(cred->euid, f->op, f->uid);
1da177e4
LT
471 break;
472 case AUDIT_SUID:
ca57ec0f 473 result = audit_uid_comparator(cred->suid, f->op, f->uid);
1da177e4
LT
474 break;
475 case AUDIT_FSUID:
ca57ec0f 476 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
1da177e4
LT
477 break;
478 case AUDIT_GID:
ca57ec0f 479 result = audit_gid_comparator(cred->gid, f->op, f->gid);
37eebe39
MI
480 if (f->op == Audit_equal) {
481 if (!result)
482 result = in_group_p(f->gid);
483 } else if (f->op == Audit_not_equal) {
484 if (result)
485 result = !in_group_p(f->gid);
486 }
1da177e4
LT
487 break;
488 case AUDIT_EGID:
ca57ec0f 489 result = audit_gid_comparator(cred->egid, f->op, f->gid);
37eebe39
MI
490 if (f->op == Audit_equal) {
491 if (!result)
492 result = in_egroup_p(f->gid);
493 } else if (f->op == Audit_not_equal) {
494 if (result)
495 result = !in_egroup_p(f->gid);
496 }
1da177e4
LT
497 break;
498 case AUDIT_SGID:
ca57ec0f 499 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
1da177e4
LT
500 break;
501 case AUDIT_FSGID:
ca57ec0f 502 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
1da177e4
LT
503 break;
504 case AUDIT_PERS:
93315ed6 505 result = audit_comparator(tsk->personality, f->op, f->val);
1da177e4 506 break;
2fd6f58b 507 case AUDIT_ARCH:
9f8dbe9c 508 if (ctx)
93315ed6 509 result = audit_comparator(ctx->arch, f->op, f->val);
2fd6f58b 510 break;
1da177e4
LT
511
512 case AUDIT_EXIT:
513 if (ctx && ctx->return_valid)
93315ed6 514 result = audit_comparator(ctx->return_code, f->op, f->val);
1da177e4
LT
515 break;
516 case AUDIT_SUCCESS:
b01f2cc1 517 if (ctx && ctx->return_valid) {
93315ed6
AG
518 if (f->val)
519 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
b01f2cc1 520 else
93315ed6 521 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
b01f2cc1 522 }
1da177e4
LT
523 break;
524 case AUDIT_DEVMAJOR:
16c174bd
EP
525 if (name) {
526 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
527 audit_comparator(MAJOR(name->rdev), f->op, f->val))
528 ++result;
529 } else if (ctx) {
5195d8e2 530 list_for_each_entry(n, &ctx->names_list, list) {
16c174bd
EP
531 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
532 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
1da177e4
LT
533 ++result;
534 break;
535 }
536 }
537 }
538 break;
539 case AUDIT_DEVMINOR:
16c174bd
EP
540 if (name) {
541 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
542 audit_comparator(MINOR(name->rdev), f->op, f->val))
543 ++result;
544 } else if (ctx) {
5195d8e2 545 list_for_each_entry(n, &ctx->names_list, list) {
16c174bd
EP
546 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
547 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
1da177e4
LT
548 ++result;
549 break;
550 }
551 }
552 }
553 break;
554 case AUDIT_INODE:
f368c07d 555 if (name)
db510fc5 556 result = audit_comparator(name->ino, f->op, f->val);
f368c07d 557 else if (ctx) {
5195d8e2
EP
558 list_for_each_entry(n, &ctx->names_list, list) {
559 if (audit_comparator(n->ino, f->op, f->val)) {
1da177e4
LT
560 ++result;
561 break;
562 }
563 }
564 }
565 break;
efaffd6e
EP
566 case AUDIT_OBJ_UID:
567 if (name) {
ca57ec0f 568 result = audit_uid_comparator(name->uid, f->op, f->uid);
efaffd6e
EP
569 } else if (ctx) {
570 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f 571 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
efaffd6e
EP
572 ++result;
573 break;
574 }
575 }
576 }
577 break;
54d3218b
EP
578 case AUDIT_OBJ_GID:
579 if (name) {
ca57ec0f 580 result = audit_gid_comparator(name->gid, f->op, f->gid);
54d3218b
EP
581 } else if (ctx) {
582 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f 583 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
54d3218b
EP
584 ++result;
585 break;
586 }
587 }
588 }
589 break;
f368c07d 590 case AUDIT_WATCH:
ae7b8f41
EP
591 if (name)
592 result = audit_watch_compare(rule->watch, name->ino, name->dev);
f368c07d 593 break;
74c3cbe3
AV
594 case AUDIT_DIR:
595 if (ctx)
596 result = match_tree_refs(ctx, rule->tree);
597 break;
1da177e4
LT
598 case AUDIT_LOGINUID:
599 result = 0;
600 if (ctx)
ca57ec0f 601 result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
1da177e4 602 break;
780a7654
EB
603 case AUDIT_LOGINUID_SET:
604 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
605 break;
3a6b9f85
DG
606 case AUDIT_SUBJ_USER:
607 case AUDIT_SUBJ_ROLE:
608 case AUDIT_SUBJ_TYPE:
609 case AUDIT_SUBJ_SEN:
610 case AUDIT_SUBJ_CLR:
3dc7e315
DG
611 /* NOTE: this may return negative values indicating
612 a temporary error. We simply treat this as a
613 match for now to avoid losing information that
614 may be wanted. An error message will also be
615 logged upon error */
04305e4a 616 if (f->lsm_rule) {
2ad312d2 617 if (need_sid) {
2a862b32 618 security_task_getsecid(tsk, &sid);
2ad312d2
SG
619 need_sid = 0;
620 }
d7a96f3a 621 result = security_audit_rule_match(sid, f->type,
3dc7e315 622 f->op,
04305e4a 623 f->lsm_rule,
3dc7e315 624 ctx);
2ad312d2 625 }
3dc7e315 626 break;
6e5a2d1d
DG
627 case AUDIT_OBJ_USER:
628 case AUDIT_OBJ_ROLE:
629 case AUDIT_OBJ_TYPE:
630 case AUDIT_OBJ_LEV_LOW:
631 case AUDIT_OBJ_LEV_HIGH:
632 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
633 also applies here */
04305e4a 634 if (f->lsm_rule) {
6e5a2d1d
DG
635 /* Find files that match */
636 if (name) {
d7a96f3a 637 result = security_audit_rule_match(
6e5a2d1d 638 name->osid, f->type, f->op,
04305e4a 639 f->lsm_rule, ctx);
6e5a2d1d 640 } else if (ctx) {
5195d8e2
EP
641 list_for_each_entry(n, &ctx->names_list, list) {
642 if (security_audit_rule_match(n->osid, f->type,
643 f->op, f->lsm_rule,
644 ctx)) {
6e5a2d1d
DG
645 ++result;
646 break;
647 }
648 }
649 }
650 /* Find ipc objects that match */
a33e6751
AV
651 if (!ctx || ctx->type != AUDIT_IPC)
652 break;
653 if (security_audit_rule_match(ctx->ipc.osid,
654 f->type, f->op,
655 f->lsm_rule, ctx))
656 ++result;
6e5a2d1d
DG
657 }
658 break;
1da177e4
LT
659 case AUDIT_ARG0:
660 case AUDIT_ARG1:
661 case AUDIT_ARG2:
662 case AUDIT_ARG3:
663 if (ctx)
93315ed6 664 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
1da177e4 665 break;
5adc8a6a
AG
666 case AUDIT_FILTERKEY:
667 /* ignore this field for filtering */
668 result = 1;
669 break;
55669bfa
AV
670 case AUDIT_PERM:
671 result = audit_match_perm(ctx, f->val);
672 break;
8b67dca9
AV
673 case AUDIT_FILETYPE:
674 result = audit_match_filetype(ctx, f->val);
675 break;
02d86a56
EP
676 case AUDIT_FIELD_COMPARE:
677 result = audit_field_compare(tsk, cred, f, ctx, name);
678 break;
1da177e4 679 }
f5629883 680 if (!result)
1da177e4
LT
681 return 0;
682 }
0590b933
AV
683
684 if (ctx) {
685 if (rule->prio <= ctx->prio)
686 return 0;
687 if (rule->filterkey) {
688 kfree(ctx->filterkey);
689 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
690 }
691 ctx->prio = rule->prio;
692 }
1da177e4
LT
693 switch (rule->action) {
694 case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
1da177e4
LT
695 case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
696 }
697 return 1;
698}
699
700/* At process creation time, we can determine if system-call auditing is
701 * completely disabled for this task. Since we only have the task
702 * structure at this point, we can only check uid and gid.
703 */
e048e02c 704static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
1da177e4
LT
705{
706 struct audit_entry *e;
707 enum audit_state state;
708
709 rcu_read_lock();
0f45aa18 710 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
f5629883
TJ
711 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
712 &state, true)) {
e048e02c
AV
713 if (state == AUDIT_RECORD_CONTEXT)
714 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
1da177e4
LT
715 rcu_read_unlock();
716 return state;
717 }
718 }
719 rcu_read_unlock();
720 return AUDIT_BUILD_CONTEXT;
721}
722
723/* At syscall entry and exit time, this filter is called if the
724 * audit_state is not low enough that auditing cannot take place, but is
23f32d18 725 * also not high enough that we already know we have to write an audit
b0dd25a8 726 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
1da177e4
LT
727 */
728static enum audit_state audit_filter_syscall(struct task_struct *tsk,
729 struct audit_context *ctx,
730 struct list_head *list)
731{
732 struct audit_entry *e;
c3896495 733 enum audit_state state;
1da177e4 734
351bb722 735 if (audit_pid && tsk->tgid == audit_pid)
f7056d64
DW
736 return AUDIT_DISABLED;
737
1da177e4 738 rcu_read_lock();
c3896495 739 if (!list_empty(list)) {
b63862f4
DK
740 int word = AUDIT_WORD(ctx->major);
741 int bit = AUDIT_BIT(ctx->major);
742
743 list_for_each_entry_rcu(e, list, list) {
f368c07d
AG
744 if ((e->rule.mask[word] & bit) == bit &&
745 audit_filter_rules(tsk, &e->rule, ctx, NULL,
f5629883 746 &state, false)) {
f368c07d 747 rcu_read_unlock();
0590b933 748 ctx->current_state = state;
f368c07d
AG
749 return state;
750 }
751 }
752 }
753 rcu_read_unlock();
754 return AUDIT_BUILD_CONTEXT;
755}
756
5195d8e2
EP
757/*
758 * Given an audit_name check the inode hash table to see if they match.
759 * Called holding the rcu read lock to protect the use of audit_inode_hash
760 */
761static int audit_filter_inode_name(struct task_struct *tsk,
762 struct audit_names *n,
763 struct audit_context *ctx) {
764 int word, bit;
765 int h = audit_hash_ino((u32)n->ino);
766 struct list_head *list = &audit_inode_hash[h];
767 struct audit_entry *e;
768 enum audit_state state;
769
770 word = AUDIT_WORD(ctx->major);
771 bit = AUDIT_BIT(ctx->major);
772
773 if (list_empty(list))
774 return 0;
775
776 list_for_each_entry_rcu(e, list, list) {
777 if ((e->rule.mask[word] & bit) == bit &&
778 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
779 ctx->current_state = state;
780 return 1;
781 }
782 }
783
784 return 0;
785}
786
787/* At syscall exit time, this filter is called if any audit_names have been
f368c07d 788 * collected during syscall processing. We only check rules in sublists at hash
5195d8e2 789 * buckets applicable to the inode numbers in audit_names.
f368c07d
AG
790 * Regarding audit_state, same rules apply as for audit_filter_syscall().
791 */
0590b933 792void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
f368c07d 793{
5195d8e2 794 struct audit_names *n;
f368c07d
AG
795
796 if (audit_pid && tsk->tgid == audit_pid)
0590b933 797 return;
f368c07d
AG
798
799 rcu_read_lock();
f368c07d 800
5195d8e2
EP
801 list_for_each_entry(n, &ctx->names_list, list) {
802 if (audit_filter_inode_name(tsk, n, ctx))
803 break;
0f45aa18
DW
804 }
805 rcu_read_unlock();
0f45aa18
DW
806}
807
1da177e4
LT
808static inline struct audit_context *audit_get_context(struct task_struct *tsk,
809 int return_valid,
6d208da8 810 long return_code)
1da177e4
LT
811{
812 struct audit_context *context = tsk->audit_context;
813
56179a6e 814 if (!context)
1da177e4
LT
815 return NULL;
816 context->return_valid = return_valid;
f701b75e
EP
817
818 /*
819 * we need to fix up the return code in the audit logs if the actual
820 * return codes are later going to be fixed up by the arch specific
821 * signal handlers
822 *
823 * This is actually a test for:
824 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
825 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
826 *
827 * but is faster than a bunch of ||
828 */
829 if (unlikely(return_code <= -ERESTARTSYS) &&
830 (return_code >= -ERESTART_RESTARTBLOCK) &&
831 (return_code != -ENOIOCTLCMD))
832 context->return_code = -EINTR;
833 else
834 context->return_code = return_code;
1da177e4 835
0590b933
AV
836 if (context->in_syscall && !context->dummy) {
837 audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
838 audit_filter_inodes(tsk, context);
1da177e4
LT
839 }
840
1da177e4
LT
841 tsk->audit_context = NULL;
842 return context;
843}
844
845static inline void audit_free_names(struct audit_context *context)
846{
5195d8e2 847 struct audit_names *n, *next;
1da177e4
LT
848
849#if AUDIT_DEBUG == 2
0590b933 850 if (context->put_count + context->ino_count != context->name_count) {
34c474de
EP
851 int i = 0;
852
73241ccc 853 printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
1da177e4
LT
854 " name_count=%d put_count=%d"
855 " ino_count=%d [NOT freeing]\n",
73241ccc 856 __FILE__, __LINE__,
1da177e4
LT
857 context->serial, context->major, context->in_syscall,
858 context->name_count, context->put_count,
859 context->ino_count);
5195d8e2 860 list_for_each_entry(n, &context->names_list, list) {
34c474de 861 printk(KERN_ERR "names[%d] = %p = %s\n", i++,
91a27b2a 862 n->name, n->name->name ?: "(null)");
8c8570fb 863 }
1da177e4
LT
864 dump_stack();
865 return;
866 }
867#endif
868#if AUDIT_DEBUG
869 context->put_count = 0;
870 context->ino_count = 0;
871#endif
872
5195d8e2
EP
873 list_for_each_entry_safe(n, next, &context->names_list, list) {
874 list_del(&n->list);
875 if (n->name && n->name_put)
65ada7bc 876 final_putname(n->name);
5195d8e2
EP
877 if (n->should_free)
878 kfree(n);
8c8570fb 879 }
1da177e4 880 context->name_count = 0;
44707fdf
JB
881 path_put(&context->pwd);
882 context->pwd.dentry = NULL;
883 context->pwd.mnt = NULL;
1da177e4
LT
884}
885
886static inline void audit_free_aux(struct audit_context *context)
887{
888 struct audit_aux_data *aux;
889
890 while ((aux = context->aux)) {
891 context->aux = aux->next;
892 kfree(aux);
893 }
e54dc243
AG
894 while ((aux = context->aux_pids)) {
895 context->aux_pids = aux->next;
896 kfree(aux);
897 }
1da177e4
LT
898}
899
1da177e4
LT
900static inline struct audit_context *audit_alloc_context(enum audit_state state)
901{
902 struct audit_context *context;
903
17c6ee70
RM
904 context = kzalloc(sizeof(*context), GFP_KERNEL);
905 if (!context)
1da177e4 906 return NULL;
e2c5adc8
AM
907 context->state = state;
908 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
916d7576 909 INIT_LIST_HEAD(&context->killed_trees);
5195d8e2 910 INIT_LIST_HEAD(&context->names_list);
1da177e4
LT
911 return context;
912}
913
b0dd25a8
RD
914/**
915 * audit_alloc - allocate an audit context block for a task
916 * @tsk: task
917 *
918 * Filter on the task information and allocate a per-task audit context
1da177e4
LT
919 * if necessary. Doing so turns on system call auditing for the
920 * specified task. This is called from copy_process, so no lock is
b0dd25a8
RD
921 * needed.
922 */
1da177e4
LT
923int audit_alloc(struct task_struct *tsk)
924{
925 struct audit_context *context;
926 enum audit_state state;
e048e02c 927 char *key = NULL;
1da177e4 928
b593d384 929 if (likely(!audit_ever_enabled))
1da177e4
LT
930 return 0; /* Return if not auditing. */
931
e048e02c 932 state = audit_filter_task(tsk, &key);
d48d8051
ON
933 if (state == AUDIT_DISABLED) {
934 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
1da177e4 935 return 0;
d48d8051 936 }
1da177e4
LT
937
938 if (!(context = audit_alloc_context(state))) {
e048e02c 939 kfree(key);
1da177e4
LT
940 audit_log_lost("out of memory in audit_alloc");
941 return -ENOMEM;
942 }
e048e02c 943 context->filterkey = key;
1da177e4 944
1da177e4
LT
945 tsk->audit_context = context;
946 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
947 return 0;
948}
949
950static inline void audit_free_context(struct audit_context *context)
951{
c62d773a
AV
952 audit_free_names(context);
953 unroll_tree_refs(context, NULL, 0);
954 free_tree_refs(context);
955 audit_free_aux(context);
956 kfree(context->filterkey);
957 kfree(context->sockaddr);
958 kfree(context);
1da177e4
LT
959}
960
e54dc243 961static int audit_log_pid_context(struct audit_context *context, pid_t pid,
cca080d9 962 kuid_t auid, kuid_t uid, unsigned int sessionid,
4746ec5b 963 u32 sid, char *comm)
e54dc243
AG
964{
965 struct audit_buffer *ab;
2a862b32 966 char *ctx = NULL;
e54dc243
AG
967 u32 len;
968 int rc = 0;
969
970 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
971 if (!ab)
6246ccab 972 return rc;
e54dc243 973
e1760bd5
EB
974 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
975 from_kuid(&init_user_ns, auid),
cca080d9 976 from_kuid(&init_user_ns, uid), sessionid);
ad395abe
EP
977 if (sid) {
978 if (security_secid_to_secctx(sid, &ctx, &len)) {
979 audit_log_format(ab, " obj=(none)");
980 rc = 1;
981 } else {
982 audit_log_format(ab, " obj=%s", ctx);
983 security_release_secctx(ctx, len);
984 }
2a862b32 985 }
c2a7780e
EP
986 audit_log_format(ab, " ocomm=");
987 audit_log_untrustedstring(ab, comm);
e54dc243 988 audit_log_end(ab);
e54dc243
AG
989
990 return rc;
991}
992
de6bbd1d
EP
993/*
994 * to_send and len_sent accounting are very loose estimates. We aren't
995 * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being
25985edc 996 * within about 500 bytes (next page boundary)
de6bbd1d
EP
997 *
998 * why snprintf? an int is up to 12 digits long. if we just assumed when
999 * logging that a[%d]= was going to be 16 characters long we would be wasting
1000 * space in every audit message. In one 7500 byte message we can log up to
1001 * about 1000 min size arguments. That comes down to about 50% waste of space
1002 * if we didn't do the snprintf to find out how long arg_num_len was.
1003 */
1004static int audit_log_single_execve_arg(struct audit_context *context,
1005 struct audit_buffer **ab,
1006 int arg_num,
1007 size_t *len_sent,
1008 const char __user *p,
1009 char *buf)
bdf4c48a 1010{
de6bbd1d
EP
1011 char arg_num_len_buf[12];
1012 const char __user *tmp_p = p;
b87ce6e4
EP
1013 /* how many digits are in arg_num? 5 is the length of ' a=""' */
1014 size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
de6bbd1d
EP
1015 size_t len, len_left, to_send;
1016 size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
1017 unsigned int i, has_cntl = 0, too_long = 0;
1018 int ret;
1019
1020 /* strnlen_user includes the null we don't want to send */
1021 len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1;
bdf4c48a 1022
de6bbd1d
EP
1023 /*
1024 * We just created this mm, if we can't find the strings
1025 * we just copied into it something is _very_ wrong. Similar
1026 * for strings that are too long, we should not have created
1027 * any.
1028 */
b0abcfc1 1029 if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) {
de6bbd1d
EP
1030 WARN_ON(1);
1031 send_sig(SIGKILL, current, 0);
b0abcfc1 1032 return -1;
de6bbd1d 1033 }
040b3a2d 1034
de6bbd1d
EP
1035 /* walk the whole argument looking for non-ascii chars */
1036 do {
1037 if (len_left > MAX_EXECVE_AUDIT_LEN)
1038 to_send = MAX_EXECVE_AUDIT_LEN;
1039 else
1040 to_send = len_left;
1041 ret = copy_from_user(buf, tmp_p, to_send);
bdf4c48a 1042 /*
de6bbd1d
EP
1043 * There is no reason for this copy to be short. We just
1044 * copied them here, and the mm hasn't been exposed to user-
1045 * space yet.
bdf4c48a 1046 */
de6bbd1d 1047 if (ret) {
bdf4c48a
PZ
1048 WARN_ON(1);
1049 send_sig(SIGKILL, current, 0);
b0abcfc1 1050 return -1;
bdf4c48a 1051 }
de6bbd1d
EP
1052 buf[to_send] = '\0';
1053 has_cntl = audit_string_contains_control(buf, to_send);
1054 if (has_cntl) {
1055 /*
1056 * hex messages get logged as 2 bytes, so we can only
1057 * send half as much in each message
1058 */
1059 max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2;
bdf4c48a
PZ
1060 break;
1061 }
de6bbd1d
EP
1062 len_left -= to_send;
1063 tmp_p += to_send;
1064 } while (len_left > 0);
1065
1066 len_left = len;
1067
1068 if (len > max_execve_audit_len)
1069 too_long = 1;
1070
1071 /* rewalk the argument actually logging the message */
1072 for (i = 0; len_left > 0; i++) {
1073 int room_left;
1074
1075 if (len_left > max_execve_audit_len)
1076 to_send = max_execve_audit_len;
1077 else
1078 to_send = len_left;
1079
1080 /* do we have space left to send this argument in this ab? */
1081 room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent;
1082 if (has_cntl)
1083 room_left -= (to_send * 2);
1084 else
1085 room_left -= to_send;
1086 if (room_left < 0) {
1087 *len_sent = 0;
1088 audit_log_end(*ab);
1089 *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE);
1090 if (!*ab)
1091 return 0;
1092 }
bdf4c48a 1093
bdf4c48a 1094 /*
de6bbd1d
EP
1095 * first record needs to say how long the original string was
1096 * so we can be sure nothing was lost.
1097 */
1098 if ((i == 0) && (too_long))
ca96a895 1099 audit_log_format(*ab, " a%d_len=%zu", arg_num,
de6bbd1d
EP
1100 has_cntl ? 2*len : len);
1101
1102 /*
1103 * normally arguments are small enough to fit and we already
1104 * filled buf above when we checked for control characters
1105 * so don't bother with another copy_from_user
bdf4c48a 1106 */
de6bbd1d
EP
1107 if (len >= max_execve_audit_len)
1108 ret = copy_from_user(buf, p, to_send);
1109 else
1110 ret = 0;
040b3a2d 1111 if (ret) {
bdf4c48a
PZ
1112 WARN_ON(1);
1113 send_sig(SIGKILL, current, 0);
b0abcfc1 1114 return -1;
bdf4c48a 1115 }
de6bbd1d
EP
1116 buf[to_send] = '\0';
1117
1118 /* actually log it */
ca96a895 1119 audit_log_format(*ab, " a%d", arg_num);
de6bbd1d
EP
1120 if (too_long)
1121 audit_log_format(*ab, "[%d]", i);
1122 audit_log_format(*ab, "=");
1123 if (has_cntl)
b556f8ad 1124 audit_log_n_hex(*ab, buf, to_send);
de6bbd1d 1125 else
9d960985 1126 audit_log_string(*ab, buf);
de6bbd1d
EP
1127
1128 p += to_send;
1129 len_left -= to_send;
1130 *len_sent += arg_num_len;
1131 if (has_cntl)
1132 *len_sent += to_send * 2;
1133 else
1134 *len_sent += to_send;
1135 }
1136 /* include the null we didn't log */
1137 return len + 1;
1138}
1139
1140static void audit_log_execve_info(struct audit_context *context,
d9cfea91 1141 struct audit_buffer **ab)
de6bbd1d 1142{
5afb8a3f
XW
1143 int i, len;
1144 size_t len_sent = 0;
de6bbd1d
EP
1145 const char __user *p;
1146 char *buf;
bdf4c48a 1147
d9cfea91 1148 p = (const char __user *)current->mm->arg_start;
bdf4c48a 1149
d9cfea91 1150 audit_log_format(*ab, "argc=%d", context->execve.argc);
de6bbd1d
EP
1151
1152 /*
1153 * we need some kernel buffer to hold the userspace args. Just
1154 * allocate one big one rather than allocating one of the right size
1155 * for every single argument inside audit_log_single_execve_arg()
1156 * should be <8k allocation so should be pretty safe.
1157 */
1158 buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1159 if (!buf) {
1160 audit_panic("out of memory for argv string\n");
1161 return;
bdf4c48a 1162 }
de6bbd1d 1163
d9cfea91 1164 for (i = 0; i < context->execve.argc; i++) {
de6bbd1d
EP
1165 len = audit_log_single_execve_arg(context, ab, i,
1166 &len_sent, p, buf);
1167 if (len <= 0)
1168 break;
1169 p += len;
1170 }
1171 kfree(buf);
bdf4c48a
PZ
1172}
1173
a33e6751 1174static void show_special(struct audit_context *context, int *call_panic)
f3298dc4
AV
1175{
1176 struct audit_buffer *ab;
1177 int i;
1178
1179 ab = audit_log_start(context, GFP_KERNEL, context->type);
1180 if (!ab)
1181 return;
1182
1183 switch (context->type) {
1184 case AUDIT_SOCKETCALL: {
1185 int nargs = context->socketcall.nargs;
1186 audit_log_format(ab, "nargs=%d", nargs);
1187 for (i = 0; i < nargs; i++)
1188 audit_log_format(ab, " a%d=%lx", i,
1189 context->socketcall.args[i]);
1190 break; }
a33e6751
AV
1191 case AUDIT_IPC: {
1192 u32 osid = context->ipc.osid;
1193
2570ebbd 1194 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
cca080d9
EB
1195 from_kuid(&init_user_ns, context->ipc.uid),
1196 from_kgid(&init_user_ns, context->ipc.gid),
1197 context->ipc.mode);
a33e6751
AV
1198 if (osid) {
1199 char *ctx = NULL;
1200 u32 len;
1201 if (security_secid_to_secctx(osid, &ctx, &len)) {
1202 audit_log_format(ab, " osid=%u", osid);
1203 *call_panic = 1;
1204 } else {
1205 audit_log_format(ab, " obj=%s", ctx);
1206 security_release_secctx(ctx, len);
1207 }
1208 }
e816f370
AV
1209 if (context->ipc.has_perm) {
1210 audit_log_end(ab);
1211 ab = audit_log_start(context, GFP_KERNEL,
1212 AUDIT_IPC_SET_PERM);
0644ec0c
KC
1213 if (unlikely(!ab))
1214 return;
e816f370 1215 audit_log_format(ab,
2570ebbd 1216 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
e816f370
AV
1217 context->ipc.qbytes,
1218 context->ipc.perm_uid,
1219 context->ipc.perm_gid,
1220 context->ipc.perm_mode);
e816f370 1221 }
a33e6751 1222 break; }
564f6993
AV
1223 case AUDIT_MQ_OPEN: {
1224 audit_log_format(ab,
df0a4283 1225 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
564f6993
AV
1226 "mq_msgsize=%ld mq_curmsgs=%ld",
1227 context->mq_open.oflag, context->mq_open.mode,
1228 context->mq_open.attr.mq_flags,
1229 context->mq_open.attr.mq_maxmsg,
1230 context->mq_open.attr.mq_msgsize,
1231 context->mq_open.attr.mq_curmsgs);
1232 break; }
c32c8af4
AV
1233 case AUDIT_MQ_SENDRECV: {
1234 audit_log_format(ab,
1235 "mqdes=%d msg_len=%zd msg_prio=%u "
1236 "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
1237 context->mq_sendrecv.mqdes,
1238 context->mq_sendrecv.msg_len,
1239 context->mq_sendrecv.msg_prio,
1240 context->mq_sendrecv.abs_timeout.tv_sec,
1241 context->mq_sendrecv.abs_timeout.tv_nsec);
1242 break; }
20114f71
AV
1243 case AUDIT_MQ_NOTIFY: {
1244 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1245 context->mq_notify.mqdes,
1246 context->mq_notify.sigev_signo);
1247 break; }
7392906e
AV
1248 case AUDIT_MQ_GETSETATTR: {
1249 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1250 audit_log_format(ab,
1251 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1252 "mq_curmsgs=%ld ",
1253 context->mq_getsetattr.mqdes,
1254 attr->mq_flags, attr->mq_maxmsg,
1255 attr->mq_msgsize, attr->mq_curmsgs);
1256 break; }
57f71a0a
AV
1257 case AUDIT_CAPSET: {
1258 audit_log_format(ab, "pid=%d", context->capset.pid);
1259 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1260 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1261 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1262 break; }
120a795d
AV
1263 case AUDIT_MMAP: {
1264 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1265 context->mmap.flags);
1266 break; }
d9cfea91
RGB
1267 case AUDIT_EXECVE: {
1268 audit_log_execve_info(context, &ab);
1269 break; }
f3298dc4
AV
1270 }
1271 audit_log_end(ab);
1272}
1273
e495149b 1274static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1da177e4 1275{
9c7aa6aa 1276 int i, call_panic = 0;
1da177e4 1277 struct audit_buffer *ab;
7551ced3 1278 struct audit_aux_data *aux;
5195d8e2 1279 struct audit_names *n;
1da177e4 1280
e495149b 1281 /* tsk == current */
3f2792ff 1282 context->personality = tsk->personality;
e495149b
AV
1283
1284 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1da177e4
LT
1285 if (!ab)
1286 return; /* audit_panic has been called */
bccf6ae0
DW
1287 audit_log_format(ab, "arch=%x syscall=%d",
1288 context->arch, context->major);
1da177e4
LT
1289 if (context->personality != PER_LINUX)
1290 audit_log_format(ab, " per=%lx", context->personality);
1291 if (context->return_valid)
9f8dbe9c 1292 audit_log_format(ab, " success=%s exit=%ld",
2fd6f58b 1293 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1294 context->return_code);
eb84a20e 1295
1da177e4 1296 audit_log_format(ab,
e23eb920
PM
1297 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1298 context->argv[0],
1299 context->argv[1],
1300 context->argv[2],
1301 context->argv[3],
1302 context->name_count);
eb84a20e 1303
e495149b 1304 audit_log_task_info(ab, tsk);
9d960985 1305 audit_log_key(ab, context->filterkey);
1da177e4 1306 audit_log_end(ab);
1da177e4 1307
7551ced3 1308 for (aux = context->aux; aux; aux = aux->next) {
c0404993 1309
e495149b 1310 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1da177e4
LT
1311 if (!ab)
1312 continue; /* audit_panic has been called */
1313
1da177e4 1314 switch (aux->type) {
20ca73bc 1315
3fc689e9
EP
1316 case AUDIT_BPRM_FCAPS: {
1317 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1318 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1319 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1320 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1321 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1322 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1323 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1324 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1325 audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
1326 audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
1327 audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
1328 break; }
1329
1da177e4
LT
1330 }
1331 audit_log_end(ab);
1da177e4
LT
1332 }
1333
f3298dc4 1334 if (context->type)
a33e6751 1335 show_special(context, &call_panic);
f3298dc4 1336
157cf649
AV
1337 if (context->fds[0] >= 0) {
1338 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1339 if (ab) {
1340 audit_log_format(ab, "fd0=%d fd1=%d",
1341 context->fds[0], context->fds[1]);
1342 audit_log_end(ab);
1343 }
1344 }
1345
4f6b434f
AV
1346 if (context->sockaddr_len) {
1347 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1348 if (ab) {
1349 audit_log_format(ab, "saddr=");
1350 audit_log_n_hex(ab, (void *)context->sockaddr,
1351 context->sockaddr_len);
1352 audit_log_end(ab);
1353 }
1354 }
1355
e54dc243
AG
1356 for (aux = context->aux_pids; aux; aux = aux->next) {
1357 struct audit_aux_data_pids *axs = (void *)aux;
e54dc243
AG
1358
1359 for (i = 0; i < axs->pid_count; i++)
1360 if (audit_log_pid_context(context, axs->target_pid[i],
c2a7780e
EP
1361 axs->target_auid[i],
1362 axs->target_uid[i],
4746ec5b 1363 axs->target_sessionid[i],
c2a7780e
EP
1364 axs->target_sid[i],
1365 axs->target_comm[i]))
e54dc243 1366 call_panic = 1;
a5cb013d
AV
1367 }
1368
e54dc243
AG
1369 if (context->target_pid &&
1370 audit_log_pid_context(context, context->target_pid,
c2a7780e 1371 context->target_auid, context->target_uid,
4746ec5b 1372 context->target_sessionid,
c2a7780e 1373 context->target_sid, context->target_comm))
e54dc243
AG
1374 call_panic = 1;
1375
44707fdf 1376 if (context->pwd.dentry && context->pwd.mnt) {
e495149b 1377 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
8f37d47c 1378 if (ab) {
c158a35c 1379 audit_log_d_path(ab, " cwd=", &context->pwd);
8f37d47c
DW
1380 audit_log_end(ab);
1381 }
1382 }
73241ccc 1383
5195d8e2 1384 i = 0;
79f6530c
JL
1385 list_for_each_entry(n, &context->names_list, list) {
1386 if (n->hidden)
1387 continue;
b24a30a7 1388 audit_log_name(context, n, NULL, i++, &call_panic);
79f6530c 1389 }
c0641f28
EP
1390
1391 /* Send end of event record to help user space know we are finished */
1392 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1393 if (ab)
1394 audit_log_end(ab);
9c7aa6aa
SG
1395 if (call_panic)
1396 audit_panic("error converting sid to string");
1da177e4
LT
1397}
1398
b0dd25a8
RD
1399/**
1400 * audit_free - free a per-task audit context
1401 * @tsk: task whose audit context block to free
1402 *
fa84cb93 1403 * Called from copy_process and do_exit
b0dd25a8 1404 */
a4ff8dba 1405void __audit_free(struct task_struct *tsk)
1da177e4
LT
1406{
1407 struct audit_context *context;
1408
1da177e4 1409 context = audit_get_context(tsk, 0, 0);
56179a6e 1410 if (!context)
1da177e4
LT
1411 return;
1412
1413 /* Check for system calls that do not go through the exit
9f8dbe9c
DW
1414 * function (e.g., exit_group), then free context block.
1415 * We use GFP_ATOMIC here because we might be doing this
f5561964 1416 * in the context of the idle thread */
e495149b 1417 /* that can happen only if we are called from do_exit() */
0590b933 1418 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
e495149b 1419 audit_log_exit(context, tsk);
916d7576
AV
1420 if (!list_empty(&context->killed_trees))
1421 audit_kill_trees(&context->killed_trees);
1da177e4
LT
1422
1423 audit_free_context(context);
1424}
1425
b0dd25a8
RD
1426/**
1427 * audit_syscall_entry - fill in an audit record at syscall entry
b0dd25a8
RD
1428 * @arch: architecture type
1429 * @major: major syscall type (function)
1430 * @a1: additional syscall register 1
1431 * @a2: additional syscall register 2
1432 * @a3: additional syscall register 3
1433 * @a4: additional syscall register 4
1434 *
1435 * Fill in audit context at syscall entry. This only happens if the
1da177e4
LT
1436 * audit context was created when the task was created and the state or
1437 * filters demand the audit context be built. If the state from the
1438 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1439 * then the record will be written at syscall exit time (otherwise, it
1440 * will only be written if another part of the kernel requests that it
b0dd25a8
RD
1441 * be written).
1442 */
b05d8447 1443void __audit_syscall_entry(int arch, int major,
1da177e4
LT
1444 unsigned long a1, unsigned long a2,
1445 unsigned long a3, unsigned long a4)
1446{
5411be59 1447 struct task_struct *tsk = current;
1da177e4
LT
1448 struct audit_context *context = tsk->audit_context;
1449 enum audit_state state;
1450
56179a6e 1451 if (!context)
86a1c34a 1452 return;
1da177e4 1453
1da177e4
LT
1454 BUG_ON(context->in_syscall || context->name_count);
1455
1456 if (!audit_enabled)
1457 return;
1458
2fd6f58b 1459 context->arch = arch;
1da177e4
LT
1460 context->major = major;
1461 context->argv[0] = a1;
1462 context->argv[1] = a2;
1463 context->argv[2] = a3;
1464 context->argv[3] = a4;
1465
1466 state = context->state;
d51374ad 1467 context->dummy = !audit_n_rules;
0590b933
AV
1468 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1469 context->prio = 0;
0f45aa18 1470 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
0590b933 1471 }
56179a6e 1472 if (state == AUDIT_DISABLED)
1da177e4
LT
1473 return;
1474
ce625a80 1475 context->serial = 0;
1da177e4
LT
1476 context->ctime = CURRENT_TIME;
1477 context->in_syscall = 1;
0590b933 1478 context->current_state = state;
419c58f1 1479 context->ppid = 0;
1da177e4
LT
1480}
1481
b0dd25a8
RD
1482/**
1483 * audit_syscall_exit - deallocate audit context after a system call
42ae610c
RD
1484 * @success: success value of the syscall
1485 * @return_code: return value of the syscall
b0dd25a8
RD
1486 *
1487 * Tear down after system call. If the audit context has been marked as
1da177e4 1488 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
42ae610c 1489 * filtering, or because some other part of the kernel wrote an audit
1da177e4 1490 * message), then write out the syscall information. In call cases,
b0dd25a8
RD
1491 * free the names stored from getname().
1492 */
d7e7528b 1493void __audit_syscall_exit(int success, long return_code)
1da177e4 1494{
5411be59 1495 struct task_struct *tsk = current;
1da177e4
LT
1496 struct audit_context *context;
1497
d7e7528b
EP
1498 if (success)
1499 success = AUDITSC_SUCCESS;
1500 else
1501 success = AUDITSC_FAILURE;
1da177e4 1502
d7e7528b 1503 context = audit_get_context(tsk, success, return_code);
56179a6e 1504 if (!context)
97e94c45 1505 return;
1da177e4 1506
0590b933 1507 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
e495149b 1508 audit_log_exit(context, tsk);
1da177e4
LT
1509
1510 context->in_syscall = 0;
0590b933 1511 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
2fd6f58b 1512
916d7576
AV
1513 if (!list_empty(&context->killed_trees))
1514 audit_kill_trees(&context->killed_trees);
1515
c62d773a
AV
1516 audit_free_names(context);
1517 unroll_tree_refs(context, NULL, 0);
1518 audit_free_aux(context);
1519 context->aux = NULL;
1520 context->aux_pids = NULL;
1521 context->target_pid = 0;
1522 context->target_sid = 0;
1523 context->sockaddr_len = 0;
1524 context->type = 0;
1525 context->fds[0] = -1;
1526 if (context->state != AUDIT_RECORD_CONTEXT) {
1527 kfree(context->filterkey);
1528 context->filterkey = NULL;
1da177e4 1529 }
c62d773a 1530 tsk->audit_context = context;
1da177e4
LT
1531}
1532
74c3cbe3
AV
1533static inline void handle_one(const struct inode *inode)
1534{
1535#ifdef CONFIG_AUDIT_TREE
1536 struct audit_context *context;
1537 struct audit_tree_refs *p;
1538 struct audit_chunk *chunk;
1539 int count;
e61ce867 1540 if (likely(hlist_empty(&inode->i_fsnotify_marks)))
74c3cbe3
AV
1541 return;
1542 context = current->audit_context;
1543 p = context->trees;
1544 count = context->tree_count;
1545 rcu_read_lock();
1546 chunk = audit_tree_lookup(inode);
1547 rcu_read_unlock();
1548 if (!chunk)
1549 return;
1550 if (likely(put_tree_ref(context, chunk)))
1551 return;
1552 if (unlikely(!grow_tree_refs(context))) {
436c405c 1553 printk(KERN_WARNING "out of memory, audit has lost a tree reference\n");
74c3cbe3
AV
1554 audit_set_auditable(context);
1555 audit_put_chunk(chunk);
1556 unroll_tree_refs(context, p, count);
1557 return;
1558 }
1559 put_tree_ref(context, chunk);
1560#endif
1561}
1562
1563static void handle_path(const struct dentry *dentry)
1564{
1565#ifdef CONFIG_AUDIT_TREE
1566 struct audit_context *context;
1567 struct audit_tree_refs *p;
1568 const struct dentry *d, *parent;
1569 struct audit_chunk *drop;
1570 unsigned long seq;
1571 int count;
1572
1573 context = current->audit_context;
1574 p = context->trees;
1575 count = context->tree_count;
1576retry:
1577 drop = NULL;
1578 d = dentry;
1579 rcu_read_lock();
1580 seq = read_seqbegin(&rename_lock);
1581 for(;;) {
1582 struct inode *inode = d->d_inode;
e61ce867 1583 if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
74c3cbe3
AV
1584 struct audit_chunk *chunk;
1585 chunk = audit_tree_lookup(inode);
1586 if (chunk) {
1587 if (unlikely(!put_tree_ref(context, chunk))) {
1588 drop = chunk;
1589 break;
1590 }
1591 }
1592 }
1593 parent = d->d_parent;
1594 if (parent == d)
1595 break;
1596 d = parent;
1597 }
1598 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1599 rcu_read_unlock();
1600 if (!drop) {
1601 /* just a race with rename */
1602 unroll_tree_refs(context, p, count);
1603 goto retry;
1604 }
1605 audit_put_chunk(drop);
1606 if (grow_tree_refs(context)) {
1607 /* OK, got more space */
1608 unroll_tree_refs(context, p, count);
1609 goto retry;
1610 }
1611 /* too bad */
1612 printk(KERN_WARNING
436c405c 1613 "out of memory, audit has lost a tree reference\n");
74c3cbe3
AV
1614 unroll_tree_refs(context, p, count);
1615 audit_set_auditable(context);
1616 return;
1617 }
1618 rcu_read_unlock();
1619#endif
1620}
1621
78e2e802
JL
1622static struct audit_names *audit_alloc_name(struct audit_context *context,
1623 unsigned char type)
5195d8e2
EP
1624{
1625 struct audit_names *aname;
1626
1627 if (context->name_count < AUDIT_NAMES) {
1628 aname = &context->preallocated_names[context->name_count];
1629 memset(aname, 0, sizeof(*aname));
1630 } else {
1631 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1632 if (!aname)
1633 return NULL;
1634 aname->should_free = true;
1635 }
1636
1637 aname->ino = (unsigned long)-1;
78e2e802 1638 aname->type = type;
5195d8e2
EP
1639 list_add_tail(&aname->list, &context->names_list);
1640
1641 context->name_count++;
1642#if AUDIT_DEBUG
1643 context->ino_count++;
1644#endif
1645 return aname;
1646}
1647
7ac86265
JL
1648/**
1649 * audit_reusename - fill out filename with info from existing entry
1650 * @uptr: userland ptr to pathname
1651 *
1652 * Search the audit_names list for the current audit context. If there is an
1653 * existing entry with a matching "uptr" then return the filename
1654 * associated with that audit_name. If not, return NULL.
1655 */
1656struct filename *
1657__audit_reusename(const __user char *uptr)
1658{
1659 struct audit_context *context = current->audit_context;
1660 struct audit_names *n;
1661
1662 list_for_each_entry(n, &context->names_list, list) {
1663 if (!n->name)
1664 continue;
1665 if (n->name->uptr == uptr)
1666 return n->name;
1667 }
1668 return NULL;
1669}
1670
b0dd25a8
RD
1671/**
1672 * audit_getname - add a name to the list
1673 * @name: name to add
1674 *
1675 * Add a name to the list of audit names for this context.
1676 * Called from fs/namei.c:getname().
1677 */
91a27b2a 1678void __audit_getname(struct filename *name)
1da177e4
LT
1679{
1680 struct audit_context *context = current->audit_context;
5195d8e2 1681 struct audit_names *n;
1da177e4 1682
1da177e4
LT
1683 if (!context->in_syscall) {
1684#if AUDIT_DEBUG == 2
1685 printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
1686 __FILE__, __LINE__, context->serial, name);
1687 dump_stack();
1688#endif
1689 return;
1690 }
5195d8e2 1691
91a27b2a
JL
1692#if AUDIT_DEBUG
1693 /* The filename _must_ have a populated ->name */
1694 BUG_ON(!name->name);
1695#endif
1696
78e2e802 1697 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
5195d8e2
EP
1698 if (!n)
1699 return;
1700
1701 n->name = name;
1702 n->name_len = AUDIT_NAME_FULL;
1703 n->name_put = true;
adb5c247 1704 name->aname = n;
5195d8e2 1705
f7ad3c6b
MS
1706 if (!context->pwd.dentry)
1707 get_fs_pwd(current->fs, &context->pwd);
1da177e4
LT
1708}
1709
b0dd25a8
RD
1710/* audit_putname - intercept a putname request
1711 * @name: name to intercept and delay for putname
1712 *
1713 * If we have stored the name from getname in the audit context,
1714 * then we delay the putname until syscall exit.
1715 * Called from include/linux/fs.h:putname().
1716 */
91a27b2a 1717void audit_putname(struct filename *name)
1da177e4
LT
1718{
1719 struct audit_context *context = current->audit_context;
1720
1721 BUG_ON(!context);
1722 if (!context->in_syscall) {
1723#if AUDIT_DEBUG == 2
65ada7bc 1724 printk(KERN_ERR "%s:%d(:%d): final_putname(%p)\n",
1da177e4
LT
1725 __FILE__, __LINE__, context->serial, name);
1726 if (context->name_count) {
5195d8e2 1727 struct audit_names *n;
34c474de 1728 int i = 0;
5195d8e2
EP
1729
1730 list_for_each_entry(n, &context->names_list, list)
34c474de 1731 printk(KERN_ERR "name[%d] = %p = %s\n", i++,
91a27b2a 1732 n->name, n->name->name ?: "(null)");
5195d8e2 1733 }
1da177e4 1734#endif
65ada7bc 1735 final_putname(name);
1da177e4
LT
1736 }
1737#if AUDIT_DEBUG
1738 else {
1739 ++context->put_count;
1740 if (context->put_count > context->name_count) {
1741 printk(KERN_ERR "%s:%d(:%d): major=%d"
1742 " in_syscall=%d putname(%p) name_count=%d"
1743 " put_count=%d\n",
1744 __FILE__, __LINE__,
1745 context->serial, context->major,
91a27b2a
JL
1746 context->in_syscall, name->name,
1747 context->name_count, context->put_count);
1da177e4
LT
1748 dump_stack();
1749 }
1750 }
1751#endif
1752}
1753
b0dd25a8 1754/**
bfcec708 1755 * __audit_inode - store the inode and device from a lookup
b0dd25a8 1756 * @name: name being audited
481968f4 1757 * @dentry: dentry being audited
79f6530c 1758 * @flags: attributes for this particular entry
b0dd25a8 1759 */
adb5c247 1760void __audit_inode(struct filename *name, const struct dentry *dentry,
79f6530c 1761 unsigned int flags)
1da177e4 1762{
1da177e4 1763 struct audit_context *context = current->audit_context;
74c3cbe3 1764 const struct inode *inode = dentry->d_inode;
5195d8e2 1765 struct audit_names *n;
79f6530c 1766 bool parent = flags & AUDIT_INODE_PARENT;
1da177e4
LT
1767
1768 if (!context->in_syscall)
1769 return;
5195d8e2 1770
9cec9d68
JL
1771 if (!name)
1772 goto out_alloc;
1773
adb5c247
JL
1774#if AUDIT_DEBUG
1775 /* The struct filename _must_ have a populated ->name */
1776 BUG_ON(!name->name);
1777#endif
1778 /*
1779 * If we have a pointer to an audit_names entry already, then we can
1780 * just use it directly if the type is correct.
1781 */
1782 n = name->aname;
1783 if (n) {
1784 if (parent) {
1785 if (n->type == AUDIT_TYPE_PARENT ||
1786 n->type == AUDIT_TYPE_UNKNOWN)
1787 goto out;
1788 } else {
1789 if (n->type != AUDIT_TYPE_PARENT)
1790 goto out;
1791 }
1792 }
1793
5195d8e2 1794 list_for_each_entry_reverse(n, &context->names_list, list) {
bfcec708 1795 /* does the name pointer match? */
adb5c247 1796 if (!n->name || n->name->name != name->name)
bfcec708
JL
1797 continue;
1798
1799 /* match the correct record type */
1800 if (parent) {
1801 if (n->type == AUDIT_TYPE_PARENT ||
1802 n->type == AUDIT_TYPE_UNKNOWN)
1803 goto out;
1804 } else {
1805 if (n->type != AUDIT_TYPE_PARENT)
1806 goto out;
1807 }
1da177e4 1808 }
5195d8e2 1809
9cec9d68 1810out_alloc:
bfcec708
JL
1811 /* unable to find the name from a previous getname(). Allocate a new
1812 * anonymous entry.
1813 */
78e2e802 1814 n = audit_alloc_name(context, AUDIT_TYPE_NORMAL);
5195d8e2
EP
1815 if (!n)
1816 return;
1817out:
bfcec708 1818 if (parent) {
91a27b2a 1819 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
bfcec708 1820 n->type = AUDIT_TYPE_PARENT;
79f6530c
JL
1821 if (flags & AUDIT_INODE_HIDDEN)
1822 n->hidden = true;
bfcec708
JL
1823 } else {
1824 n->name_len = AUDIT_NAME_FULL;
1825 n->type = AUDIT_TYPE_NORMAL;
1826 }
74c3cbe3 1827 handle_path(dentry);
5195d8e2 1828 audit_copy_inode(n, dentry, inode);
73241ccc
AG
1829}
1830
1831/**
c43a25ab 1832 * __audit_inode_child - collect inode info for created/removed objects
73d3ec5a 1833 * @parent: inode of dentry parent
c43a25ab 1834 * @dentry: dentry being audited
4fa6b5ec 1835 * @type: AUDIT_TYPE_* value that we're looking for
73241ccc
AG
1836 *
1837 * For syscalls that create or remove filesystem objects, audit_inode
1838 * can only collect information for the filesystem object's parent.
1839 * This call updates the audit context with the child's information.
1840 * Syscalls that create a new filesystem object must be hooked after
1841 * the object is created. Syscalls that remove a filesystem object
1842 * must be hooked prior, in order to capture the target inode during
1843 * unsuccessful attempts.
1844 */
c43a25ab 1845void __audit_inode_child(const struct inode *parent,
4fa6b5ec
JL
1846 const struct dentry *dentry,
1847 const unsigned char type)
73241ccc 1848{
73241ccc 1849 struct audit_context *context = current->audit_context;
5a190ae6 1850 const struct inode *inode = dentry->d_inode;
cccc6bba 1851 const char *dname = dentry->d_name.name;
4fa6b5ec 1852 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
73241ccc
AG
1853
1854 if (!context->in_syscall)
1855 return;
1856
74c3cbe3
AV
1857 if (inode)
1858 handle_one(inode);
73241ccc 1859
4fa6b5ec 1860 /* look for a parent entry first */
5195d8e2 1861 list_for_each_entry(n, &context->names_list, list) {
4fa6b5ec 1862 if (!n->name || n->type != AUDIT_TYPE_PARENT)
5712e88f
AG
1863 continue;
1864
1865 if (n->ino == parent->i_ino &&
91a27b2a 1866 !audit_compare_dname_path(dname, n->name->name, n->name_len)) {
4fa6b5ec
JL
1867 found_parent = n;
1868 break;
f368c07d 1869 }
5712e88f 1870 }
73241ccc 1871
4fa6b5ec 1872 /* is there a matching child entry? */
5195d8e2 1873 list_for_each_entry(n, &context->names_list, list) {
4fa6b5ec
JL
1874 /* can only match entries that have a name */
1875 if (!n->name || n->type != type)
1876 continue;
1877
1878 /* if we found a parent, make sure this one is a child of it */
1879 if (found_parent && (n->name != found_parent->name))
5712e88f
AG
1880 continue;
1881
91a27b2a
JL
1882 if (!strcmp(dname, n->name->name) ||
1883 !audit_compare_dname_path(dname, n->name->name,
4fa6b5ec
JL
1884 found_parent ?
1885 found_parent->name_len :
e3d6b07b 1886 AUDIT_NAME_FULL)) {
4fa6b5ec
JL
1887 found_child = n;
1888 break;
5712e88f 1889 }
ac9910ce 1890 }
5712e88f 1891
5712e88f 1892 if (!found_parent) {
4fa6b5ec
JL
1893 /* create a new, "anonymous" parent record */
1894 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
5195d8e2 1895 if (!n)
ac9910ce 1896 return;
5195d8e2 1897 audit_copy_inode(n, NULL, parent);
73d3ec5a 1898 }
5712e88f
AG
1899
1900 if (!found_child) {
4fa6b5ec
JL
1901 found_child = audit_alloc_name(context, type);
1902 if (!found_child)
5712e88f 1903 return;
5712e88f
AG
1904
1905 /* Re-use the name belonging to the slot for a matching parent
1906 * directory. All names for this context are relinquished in
1907 * audit_free_names() */
1908 if (found_parent) {
4fa6b5ec
JL
1909 found_child->name = found_parent->name;
1910 found_child->name_len = AUDIT_NAME_FULL;
5712e88f 1911 /* don't call __putname() */
4fa6b5ec 1912 found_child->name_put = false;
5712e88f 1913 }
5712e88f 1914 }
4fa6b5ec
JL
1915 if (inode)
1916 audit_copy_inode(found_child, dentry, inode);
1917 else
1918 found_child->ino = (unsigned long)-1;
3e2efce0 1919}
50e437d5 1920EXPORT_SYMBOL_GPL(__audit_inode_child);
3e2efce0 1921
b0dd25a8
RD
1922/**
1923 * auditsc_get_stamp - get local copies of audit_context values
1924 * @ctx: audit_context for the task
1925 * @t: timespec to store time recorded in the audit_context
1926 * @serial: serial value that is recorded in the audit_context
1927 *
1928 * Also sets the context as auditable.
1929 */
48887e63 1930int auditsc_get_stamp(struct audit_context *ctx,
bfb4496e 1931 struct timespec *t, unsigned int *serial)
1da177e4 1932{
48887e63
AV
1933 if (!ctx->in_syscall)
1934 return 0;
ce625a80
DW
1935 if (!ctx->serial)
1936 ctx->serial = audit_serial();
bfb4496e
DW
1937 t->tv_sec = ctx->ctime.tv_sec;
1938 t->tv_nsec = ctx->ctime.tv_nsec;
1939 *serial = ctx->serial;
0590b933
AV
1940 if (!ctx->prio) {
1941 ctx->prio = 1;
1942 ctx->current_state = AUDIT_RECORD_CONTEXT;
1943 }
48887e63 1944 return 1;
1da177e4
LT
1945}
1946
4746ec5b
EP
1947/* global counter which is incremented every time something logs in */
1948static atomic_t session_id = ATOMIC_INIT(0);
1949
da0a6104
EP
1950static int audit_set_loginuid_perm(kuid_t loginuid)
1951{
da0a6104
EP
1952 /* if we are unset, we don't need privs */
1953 if (!audit_loginuid_set(current))
1954 return 0;
21b85c31
EP
1955 /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
1956 if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
1957 return -EPERM;
83fa6bbe
EP
1958 /* it is set, you need permission */
1959 if (!capable(CAP_AUDIT_CONTROL))
1960 return -EPERM;
d040e5af
EP
1961 /* reject if this is not an unset and we don't allow that */
1962 if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
1963 return -EPERM;
83fa6bbe 1964 return 0;
da0a6104
EP
1965}
1966
1967static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
1968 unsigned int oldsessionid, unsigned int sessionid,
1969 int rc)
1970{
1971 struct audit_buffer *ab;
5ee9a75c 1972 uid_t uid, oldloginuid, loginuid;
da0a6104 1973
c2412d91
G
1974 if (!audit_enabled)
1975 return;
1976
da0a6104 1977 uid = from_kuid(&init_user_ns, task_uid(current));
5ee9a75c
RGB
1978 oldloginuid = from_kuid(&init_user_ns, koldloginuid);
1979 loginuid = from_kuid(&init_user_ns, kloginuid),
da0a6104
EP
1980
1981 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1982 if (!ab)
1983 return;
5ee9a75c
RGB
1984 audit_log_format(ab, "pid=%d uid=%u"
1985 " old-auid=%u new-auid=%u old-ses=%u new-ses=%u"
1986 " res=%d",
1987 current->pid, uid,
1988 oldloginuid, loginuid, oldsessionid, sessionid,
1989 !rc);
da0a6104
EP
1990 audit_log_end(ab);
1991}
1992
b0dd25a8 1993/**
0a300be6 1994 * audit_set_loginuid - set current task's audit_context loginuid
b0dd25a8
RD
1995 * @loginuid: loginuid value
1996 *
1997 * Returns 0.
1998 *
1999 * Called (set) from fs/proc/base.c::proc_loginuid_write().
2000 */
e1760bd5 2001int audit_set_loginuid(kuid_t loginuid)
1da177e4 2002{
0a300be6 2003 struct task_struct *task = current;
9175c9d2
EP
2004 unsigned int oldsessionid, sessionid = (unsigned int)-1;
2005 kuid_t oldloginuid;
da0a6104 2006 int rc;
41757106 2007
da0a6104
EP
2008 oldloginuid = audit_get_loginuid(current);
2009 oldsessionid = audit_get_sessionid(current);
2010
2011 rc = audit_set_loginuid_perm(loginuid);
2012 if (rc)
2013 goto out;
633b4545 2014
81407c84
EP
2015 /* are we setting or clearing? */
2016 if (uid_valid(loginuid))
4440e854 2017 sessionid = (unsigned int)atomic_inc_return(&session_id);
bfef93a5 2018
4746ec5b 2019 task->sessionid = sessionid;
bfef93a5 2020 task->loginuid = loginuid;
da0a6104
EP
2021out:
2022 audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2023 return rc;
1da177e4
LT
2024}
2025
20ca73bc
GW
2026/**
2027 * __audit_mq_open - record audit data for a POSIX MQ open
2028 * @oflag: open flag
2029 * @mode: mode bits
6b962559 2030 * @attr: queue attributes
20ca73bc 2031 *
20ca73bc 2032 */
df0a4283 2033void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
20ca73bc 2034{
20ca73bc
GW
2035 struct audit_context *context = current->audit_context;
2036
564f6993
AV
2037 if (attr)
2038 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2039 else
2040 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
20ca73bc 2041
564f6993
AV
2042 context->mq_open.oflag = oflag;
2043 context->mq_open.mode = mode;
20ca73bc 2044
564f6993 2045 context->type = AUDIT_MQ_OPEN;
20ca73bc
GW
2046}
2047
2048/**
c32c8af4 2049 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
20ca73bc
GW
2050 * @mqdes: MQ descriptor
2051 * @msg_len: Message length
2052 * @msg_prio: Message priority
c32c8af4 2053 * @abs_timeout: Message timeout in absolute time
20ca73bc 2054 *
20ca73bc 2055 */
c32c8af4
AV
2056void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2057 const struct timespec *abs_timeout)
20ca73bc 2058{
20ca73bc 2059 struct audit_context *context = current->audit_context;
c32c8af4 2060 struct timespec *p = &context->mq_sendrecv.abs_timeout;
20ca73bc 2061
c32c8af4
AV
2062 if (abs_timeout)
2063 memcpy(p, abs_timeout, sizeof(struct timespec));
2064 else
2065 memset(p, 0, sizeof(struct timespec));
20ca73bc 2066
c32c8af4
AV
2067 context->mq_sendrecv.mqdes = mqdes;
2068 context->mq_sendrecv.msg_len = msg_len;
2069 context->mq_sendrecv.msg_prio = msg_prio;
20ca73bc 2070
c32c8af4 2071 context->type = AUDIT_MQ_SENDRECV;
20ca73bc
GW
2072}
2073
2074/**
2075 * __audit_mq_notify - record audit data for a POSIX MQ notify
2076 * @mqdes: MQ descriptor
6b962559 2077 * @notification: Notification event
20ca73bc 2078 *
20ca73bc
GW
2079 */
2080
20114f71 2081void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
20ca73bc 2082{
20ca73bc
GW
2083 struct audit_context *context = current->audit_context;
2084
20114f71
AV
2085 if (notification)
2086 context->mq_notify.sigev_signo = notification->sigev_signo;
2087 else
2088 context->mq_notify.sigev_signo = 0;
20ca73bc 2089
20114f71
AV
2090 context->mq_notify.mqdes = mqdes;
2091 context->type = AUDIT_MQ_NOTIFY;
20ca73bc
GW
2092}
2093
2094/**
2095 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2096 * @mqdes: MQ descriptor
2097 * @mqstat: MQ flags
2098 *
20ca73bc 2099 */
7392906e 2100void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
20ca73bc 2101{
20ca73bc 2102 struct audit_context *context = current->audit_context;
7392906e
AV
2103 context->mq_getsetattr.mqdes = mqdes;
2104 context->mq_getsetattr.mqstat = *mqstat;
2105 context->type = AUDIT_MQ_GETSETATTR;
20ca73bc
GW
2106}
2107
b0dd25a8 2108/**
073115d6
SG
2109 * audit_ipc_obj - record audit data for ipc object
2110 * @ipcp: ipc permissions
2111 *
073115d6 2112 */
a33e6751 2113void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
073115d6 2114{
073115d6 2115 struct audit_context *context = current->audit_context;
a33e6751
AV
2116 context->ipc.uid = ipcp->uid;
2117 context->ipc.gid = ipcp->gid;
2118 context->ipc.mode = ipcp->mode;
e816f370 2119 context->ipc.has_perm = 0;
a33e6751
AV
2120 security_ipc_getsecid(ipcp, &context->ipc.osid);
2121 context->type = AUDIT_IPC;
073115d6
SG
2122}
2123
2124/**
2125 * audit_ipc_set_perm - record audit data for new ipc permissions
b0dd25a8
RD
2126 * @qbytes: msgq bytes
2127 * @uid: msgq user id
2128 * @gid: msgq group id
2129 * @mode: msgq mode (permissions)
2130 *
e816f370 2131 * Called only after audit_ipc_obj().
b0dd25a8 2132 */
2570ebbd 2133void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
1da177e4 2134{
1da177e4
LT
2135 struct audit_context *context = current->audit_context;
2136
e816f370
AV
2137 context->ipc.qbytes = qbytes;
2138 context->ipc.perm_uid = uid;
2139 context->ipc.perm_gid = gid;
2140 context->ipc.perm_mode = mode;
2141 context->ipc.has_perm = 1;
1da177e4 2142}
c2f0c7c3 2143
d9cfea91 2144void __audit_bprm(struct linux_binprm *bprm)
473ae30b 2145{
473ae30b 2146 struct audit_context *context = current->audit_context;
473ae30b 2147
d9cfea91
RGB
2148 context->type = AUDIT_EXECVE;
2149 context->execve.argc = bprm->argc;
473ae30b
AV
2150}
2151
2152
b0dd25a8
RD
2153/**
2154 * audit_socketcall - record audit data for sys_socketcall
2950fa9d 2155 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
b0dd25a8
RD
2156 * @args: args array
2157 *
b0dd25a8 2158 */
2950fa9d 2159int __audit_socketcall(int nargs, unsigned long *args)
3ec3b2fb 2160{
3ec3b2fb
DW
2161 struct audit_context *context = current->audit_context;
2162
2950fa9d
CG
2163 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2164 return -EINVAL;
f3298dc4
AV
2165 context->type = AUDIT_SOCKETCALL;
2166 context->socketcall.nargs = nargs;
2167 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2950fa9d 2168 return 0;
3ec3b2fb
DW
2169}
2170
db349509
AV
2171/**
2172 * __audit_fd_pair - record audit data for pipe and socketpair
2173 * @fd1: the first file descriptor
2174 * @fd2: the second file descriptor
2175 *
db349509 2176 */
157cf649 2177void __audit_fd_pair(int fd1, int fd2)
db349509
AV
2178{
2179 struct audit_context *context = current->audit_context;
157cf649
AV
2180 context->fds[0] = fd1;
2181 context->fds[1] = fd2;
db349509
AV
2182}
2183
b0dd25a8
RD
2184/**
2185 * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2186 * @len: data length in user space
2187 * @a: data address in kernel space
2188 *
2189 * Returns 0 for success or NULL context or < 0 on error.
2190 */
07c49417 2191int __audit_sockaddr(int len, void *a)
3ec3b2fb 2192{
3ec3b2fb
DW
2193 struct audit_context *context = current->audit_context;
2194
4f6b434f
AV
2195 if (!context->sockaddr) {
2196 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2197 if (!p)
2198 return -ENOMEM;
2199 context->sockaddr = p;
2200 }
3ec3b2fb 2201
4f6b434f
AV
2202 context->sockaddr_len = len;
2203 memcpy(context->sockaddr, a, len);
3ec3b2fb
DW
2204 return 0;
2205}
2206
a5cb013d
AV
2207void __audit_ptrace(struct task_struct *t)
2208{
2209 struct audit_context *context = current->audit_context;
2210
2211 context->target_pid = t->pid;
c2a7780e 2212 context->target_auid = audit_get_loginuid(t);
c69e8d9c 2213 context->target_uid = task_uid(t);
4746ec5b 2214 context->target_sessionid = audit_get_sessionid(t);
2a862b32 2215 security_task_getsecid(t, &context->target_sid);
c2a7780e 2216 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
a5cb013d
AV
2217}
2218
b0dd25a8
RD
2219/**
2220 * audit_signal_info - record signal info for shutting down audit subsystem
2221 * @sig: signal value
2222 * @t: task being signaled
2223 *
2224 * If the audit subsystem is being terminated, record the task (pid)
2225 * and uid that is doing that.
2226 */
e54dc243 2227int __audit_signal_info(int sig, struct task_struct *t)
c2f0c7c3 2228{
e54dc243
AG
2229 struct audit_aux_data_pids *axp;
2230 struct task_struct *tsk = current;
2231 struct audit_context *ctx = tsk->audit_context;
cca080d9 2232 kuid_t uid = current_uid(), t_uid = task_uid(t);
e1396065 2233
175fc484 2234 if (audit_pid && t->tgid == audit_pid) {
ee1d3156 2235 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
175fc484 2236 audit_sig_pid = tsk->pid;
e1760bd5 2237 if (uid_valid(tsk->loginuid))
bfef93a5 2238 audit_sig_uid = tsk->loginuid;
175fc484 2239 else
c69e8d9c 2240 audit_sig_uid = uid;
2a862b32 2241 security_task_getsecid(tsk, &audit_sig_sid);
175fc484
AV
2242 }
2243 if (!audit_signals || audit_dummy_context())
2244 return 0;
c2f0c7c3 2245 }
e54dc243 2246
e54dc243
AG
2247 /* optimize the common case by putting first signal recipient directly
2248 * in audit_context */
2249 if (!ctx->target_pid) {
2250 ctx->target_pid = t->tgid;
c2a7780e 2251 ctx->target_auid = audit_get_loginuid(t);
c69e8d9c 2252 ctx->target_uid = t_uid;
4746ec5b 2253 ctx->target_sessionid = audit_get_sessionid(t);
2a862b32 2254 security_task_getsecid(t, &ctx->target_sid);
c2a7780e 2255 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
e54dc243
AG
2256 return 0;
2257 }
2258
2259 axp = (void *)ctx->aux_pids;
2260 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2261 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2262 if (!axp)
2263 return -ENOMEM;
2264
2265 axp->d.type = AUDIT_OBJ_PID;
2266 axp->d.next = ctx->aux_pids;
2267 ctx->aux_pids = (void *)axp;
2268 }
88ae704c 2269 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
e54dc243
AG
2270
2271 axp->target_pid[axp->pid_count] = t->tgid;
c2a7780e 2272 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
c69e8d9c 2273 axp->target_uid[axp->pid_count] = t_uid;
4746ec5b 2274 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2a862b32 2275 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
c2a7780e 2276 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
e54dc243
AG
2277 axp->pid_count++;
2278
2279 return 0;
c2f0c7c3 2280}
0a4ff8c2 2281
3fc689e9
EP
2282/**
2283 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
d84f4f99
DH
2284 * @bprm: pointer to the bprm being processed
2285 * @new: the proposed new credentials
2286 * @old: the old credentials
3fc689e9
EP
2287 *
2288 * Simply check if the proc already has the caps given by the file and if not
2289 * store the priv escalation info for later auditing at the end of the syscall
2290 *
3fc689e9
EP
2291 * -Eric
2292 */
d84f4f99
DH
2293int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2294 const struct cred *new, const struct cred *old)
3fc689e9
EP
2295{
2296 struct audit_aux_data_bprm_fcaps *ax;
2297 struct audit_context *context = current->audit_context;
2298 struct cpu_vfs_cap_data vcaps;
2299 struct dentry *dentry;
2300
2301 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2302 if (!ax)
d84f4f99 2303 return -ENOMEM;
3fc689e9
EP
2304
2305 ax->d.type = AUDIT_BPRM_FCAPS;
2306 ax->d.next = context->aux;
2307 context->aux = (void *)ax;
2308
2309 dentry = dget(bprm->file->f_dentry);
2310 get_vfs_caps_from_disk(dentry, &vcaps);
2311 dput(dentry);
2312
2313 ax->fcap.permitted = vcaps.permitted;
2314 ax->fcap.inheritable = vcaps.inheritable;
2315 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2316 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2317
d84f4f99
DH
2318 ax->old_pcap.permitted = old->cap_permitted;
2319 ax->old_pcap.inheritable = old->cap_inheritable;
2320 ax->old_pcap.effective = old->cap_effective;
3fc689e9 2321
d84f4f99
DH
2322 ax->new_pcap.permitted = new->cap_permitted;
2323 ax->new_pcap.inheritable = new->cap_inheritable;
2324 ax->new_pcap.effective = new->cap_effective;
2325 return 0;
3fc689e9
EP
2326}
2327
e68b75a0
EP
2328/**
2329 * __audit_log_capset - store information about the arguments to the capset syscall
d84f4f99
DH
2330 * @new: the new credentials
2331 * @old: the old (current) credentials
e68b75a0
EP
2332 *
2333 * Record the aguments userspace sent to sys_capset for later printing by the
2334 * audit system if applicable
2335 */
ca24a23e 2336void __audit_log_capset(const struct cred *new, const struct cred *old)
e68b75a0 2337{
e68b75a0 2338 struct audit_context *context = current->audit_context;
ca24a23e 2339 context->capset.pid = task_pid_nr(current);
57f71a0a
AV
2340 context->capset.cap.effective = new->cap_effective;
2341 context->capset.cap.inheritable = new->cap_effective;
2342 context->capset.cap.permitted = new->cap_permitted;
2343 context->type = AUDIT_CAPSET;
e68b75a0
EP
2344}
2345
120a795d
AV
2346void __audit_mmap_fd(int fd, int flags)
2347{
2348 struct audit_context *context = current->audit_context;
2349 context->mmap.fd = fd;
2350 context->mmap.flags = flags;
2351 context->type = AUDIT_MMAP;
2352}
2353
7b9205bd 2354static void audit_log_task(struct audit_buffer *ab)
85e7bac3 2355{
cca080d9
EB
2356 kuid_t auid, uid;
2357 kgid_t gid;
85e7bac3 2358 unsigned int sessionid;
ff235f51 2359 struct mm_struct *mm = current->mm;
85e7bac3
EP
2360
2361 auid = audit_get_loginuid(current);
2362 sessionid = audit_get_sessionid(current);
2363 current_uid_gid(&uid, &gid);
2364
2365 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
cca080d9
EB
2366 from_kuid(&init_user_ns, auid),
2367 from_kuid(&init_user_ns, uid),
2368 from_kgid(&init_user_ns, gid),
2369 sessionid);
85e7bac3
EP
2370 audit_log_task_context(ab);
2371 audit_log_format(ab, " pid=%d comm=", current->pid);
2372 audit_log_untrustedstring(ab, current->comm);
ff235f51
PD
2373 if (mm) {
2374 down_read(&mm->mmap_sem);
2375 if (mm->exe_file)
2376 audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
2377 up_read(&mm->mmap_sem);
2378 } else
2379 audit_log_format(ab, " exe=(null)");
7b9205bd
KC
2380}
2381
0a4ff8c2
SG
2382/**
2383 * audit_core_dumps - record information about processes that end abnormally
6d9525b5 2384 * @signr: signal value
0a4ff8c2
SG
2385 *
2386 * If a process ends with a core dump, something fishy is going on and we
2387 * should record the event for investigation.
2388 */
2389void audit_core_dumps(long signr)
2390{
2391 struct audit_buffer *ab;
0a4ff8c2
SG
2392
2393 if (!audit_enabled)
2394 return;
2395
2396 if (signr == SIGQUIT) /* don't care for those */
2397 return;
2398
2399 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
0644ec0c
KC
2400 if (unlikely(!ab))
2401 return;
61c0ee87
PD
2402 audit_log_task(ab);
2403 audit_log_format(ab, " sig=%ld", signr);
85e7bac3
EP
2404 audit_log_end(ab);
2405}
0a4ff8c2 2406
3dc1c1b2 2407void __audit_seccomp(unsigned long syscall, long signr, int code)
85e7bac3
EP
2408{
2409 struct audit_buffer *ab;
2410
7b9205bd
KC
2411 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
2412 if (unlikely(!ab))
2413 return;
2414 audit_log_task(ab);
2415 audit_log_format(ab, " sig=%ld", signr);
85e7bac3 2416 audit_log_format(ab, " syscall=%ld", syscall);
3dc1c1b2
KC
2417 audit_log_format(ab, " compat=%d", is_compat_task());
2418 audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current));
2419 audit_log_format(ab, " code=0x%x", code);
0a4ff8c2
SG
2420 audit_log_end(ab);
2421}
916d7576
AV
2422
2423struct list_head *audit_killed_trees(void)
2424{
2425 struct audit_context *ctx = current->audit_context;
2426 if (likely(!ctx || !ctx->in_syscall))
2427 return NULL;
2428 return &ctx->killed_trees;
2429}