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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
f952d10f
RGB
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
1da177e4 47#include <linux/init.h>
1da177e4 48#include <asm/types.h>
60063497 49#include <linux/atomic.h>
73241ccc
AG
50#include <linux/fs.h>
51#include <linux/namei.h>
1da177e4 52#include <linux/mm.h>
9984de1a 53#include <linux/export.h>
5a0e3ad6 54#include <linux/slab.h>
01116105 55#include <linux/mount.h>
3ec3b2fb 56#include <linux/socket.h>
20ca73bc 57#include <linux/mqueue.h>
1da177e4
LT
58#include <linux/audit.h>
59#include <linux/personality.h>
60#include <linux/time.h>
5bb289b5 61#include <linux/netlink.h>
f5561964 62#include <linux/compiler.h>
1da177e4 63#include <asm/unistd.h>
8c8570fb 64#include <linux/security.h>
fe7752ba 65#include <linux/list.h>
473ae30b 66#include <linux/binfmts.h>
a1f8e7f7 67#include <linux/highmem.h>
f46038ff 68#include <linux/syscalls.h>
84db564a 69#include <asm/syscall.h>
851f7ff5 70#include <linux/capability.h>
5ad4e53b 71#include <linux/fs_struct.h>
3dc1c1b2 72#include <linux/compat.h>
3f1c8250 73#include <linux/ctype.h>
fcf22d82 74#include <linux/string.h>
43761473 75#include <linux/uaccess.h>
9dd813c1 76#include <linux/fsnotify_backend.h>
fcf22d82 77#include <uapi/linux/limits.h>
1da177e4 78
fe7752ba 79#include "audit.h"
1da177e4 80
d7e7528b
EP
81/* flags stating the success for a syscall */
82#define AUDITSC_INVALID 0
83#define AUDITSC_SUCCESS 1
84#define AUDITSC_FAILURE 2
85
43761473
PM
86/* no execve audit message should be longer than this (userspace limits),
87 * see the note near the top of audit_log_execve_info() about this value */
de6bbd1d
EP
88#define MAX_EXECVE_AUDIT_LEN 7500
89
3f1c8250
WR
90/* max length to print of cmdline/proctitle value during audit */
91#define MAX_PROCTITLE_AUDIT_LEN 128
92
471a5c7c
AV
93/* number of audit rules */
94int audit_n_rules;
95
e54dc243
AG
96/* determines whether we collect data for signals sent */
97int audit_signals;
98
1da177e4
LT
99struct audit_aux_data {
100 struct audit_aux_data *next;
101 int type;
102};
103
104#define AUDIT_AUX_IPCPERM 0
105
e54dc243
AG
106/* Number of target pids per aux struct. */
107#define AUDIT_AUX_PIDS 16
108
e54dc243
AG
109struct audit_aux_data_pids {
110 struct audit_aux_data d;
111 pid_t target_pid[AUDIT_AUX_PIDS];
e1760bd5 112 kuid_t target_auid[AUDIT_AUX_PIDS];
cca080d9 113 kuid_t target_uid[AUDIT_AUX_PIDS];
4746ec5b 114 unsigned int target_sessionid[AUDIT_AUX_PIDS];
e54dc243 115 u32 target_sid[AUDIT_AUX_PIDS];
c2a7780e 116 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
e54dc243
AG
117 int pid_count;
118};
119
3fc689e9
EP
120struct audit_aux_data_bprm_fcaps {
121 struct audit_aux_data d;
122 struct audit_cap_data fcap;
123 unsigned int fcap_ver;
124 struct audit_cap_data old_pcap;
125 struct audit_cap_data new_pcap;
126};
127
74c3cbe3
AV
128struct audit_tree_refs {
129 struct audit_tree_refs *next;
130 struct audit_chunk *c[31];
131};
132
55669bfa
AV
133static int audit_match_perm(struct audit_context *ctx, int mask)
134{
c4bacefb 135 unsigned n;
1a61c88d 136 if (unlikely(!ctx))
137 return 0;
c4bacefb 138 n = ctx->major;
dbda4c0b 139
55669bfa
AV
140 switch (audit_classify_syscall(ctx->arch, n)) {
141 case 0: /* native */
142 if ((mask & AUDIT_PERM_WRITE) &&
143 audit_match_class(AUDIT_CLASS_WRITE, n))
144 return 1;
145 if ((mask & AUDIT_PERM_READ) &&
146 audit_match_class(AUDIT_CLASS_READ, n))
147 return 1;
148 if ((mask & AUDIT_PERM_ATTR) &&
149 audit_match_class(AUDIT_CLASS_CHATTR, n))
150 return 1;
151 return 0;
152 case 1: /* 32bit on biarch */
153 if ((mask & AUDIT_PERM_WRITE) &&
154 audit_match_class(AUDIT_CLASS_WRITE_32, n))
155 return 1;
156 if ((mask & AUDIT_PERM_READ) &&
157 audit_match_class(AUDIT_CLASS_READ_32, n))
158 return 1;
159 if ((mask & AUDIT_PERM_ATTR) &&
160 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
161 return 1;
162 return 0;
163 case 2: /* open */
164 return mask & ACC_MODE(ctx->argv[1]);
165 case 3: /* openat */
166 return mask & ACC_MODE(ctx->argv[2]);
167 case 4: /* socketcall */
168 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
169 case 5: /* execve */
170 return mask & AUDIT_PERM_EXEC;
171 default:
172 return 0;
173 }
174}
175
5ef30ee5 176static int audit_match_filetype(struct audit_context *ctx, int val)
8b67dca9 177{
5195d8e2 178 struct audit_names *n;
5ef30ee5 179 umode_t mode = (umode_t)val;
1a61c88d 180
181 if (unlikely(!ctx))
182 return 0;
183
5195d8e2 184 list_for_each_entry(n, &ctx->names_list, list) {
84cb777e 185 if ((n->ino != AUDIT_INO_UNSET) &&
5195d8e2 186 ((n->mode & S_IFMT) == mode))
5ef30ee5
EP
187 return 1;
188 }
5195d8e2 189
5ef30ee5 190 return 0;
8b67dca9
AV
191}
192
74c3cbe3
AV
193/*
194 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
195 * ->first_trees points to its beginning, ->trees - to the current end of data.
196 * ->tree_count is the number of free entries in array pointed to by ->trees.
197 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
198 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
199 * it's going to remain 1-element for almost any setup) until we free context itself.
200 * References in it _are_ dropped - at the same time we free/drop aux stuff.
201 */
202
203#ifdef CONFIG_AUDIT_TREE
679173b7
EP
204static void audit_set_auditable(struct audit_context *ctx)
205{
206 if (!ctx->prio) {
207 ctx->prio = 1;
208 ctx->current_state = AUDIT_RECORD_CONTEXT;
209 }
210}
211
74c3cbe3
AV
212static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
213{
214 struct audit_tree_refs *p = ctx->trees;
215 int left = ctx->tree_count;
216 if (likely(left)) {
217 p->c[--left] = chunk;
218 ctx->tree_count = left;
219 return 1;
220 }
221 if (!p)
222 return 0;
223 p = p->next;
224 if (p) {
225 p->c[30] = chunk;
226 ctx->trees = p;
227 ctx->tree_count = 30;
228 return 1;
229 }
230 return 0;
231}
232
233static int grow_tree_refs(struct audit_context *ctx)
234{
235 struct audit_tree_refs *p = ctx->trees;
236 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
237 if (!ctx->trees) {
238 ctx->trees = p;
239 return 0;
240 }
241 if (p)
242 p->next = ctx->trees;
243 else
244 ctx->first_trees = ctx->trees;
245 ctx->tree_count = 31;
246 return 1;
247}
248#endif
249
250static void unroll_tree_refs(struct audit_context *ctx,
251 struct audit_tree_refs *p, int count)
252{
253#ifdef CONFIG_AUDIT_TREE
254 struct audit_tree_refs *q;
255 int n;
256 if (!p) {
257 /* we started with empty chain */
258 p = ctx->first_trees;
259 count = 31;
260 /* if the very first allocation has failed, nothing to do */
261 if (!p)
262 return;
263 }
264 n = count;
265 for (q = p; q != ctx->trees; q = q->next, n = 31) {
266 while (n--) {
267 audit_put_chunk(q->c[n]);
268 q->c[n] = NULL;
269 }
270 }
271 while (n-- > ctx->tree_count) {
272 audit_put_chunk(q->c[n]);
273 q->c[n] = NULL;
274 }
275 ctx->trees = p;
276 ctx->tree_count = count;
277#endif
278}
279
280static void free_tree_refs(struct audit_context *ctx)
281{
282 struct audit_tree_refs *p, *q;
283 for (p = ctx->first_trees; p; p = q) {
284 q = p->next;
285 kfree(p);
286 }
287}
288
289static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
290{
291#ifdef CONFIG_AUDIT_TREE
292 struct audit_tree_refs *p;
293 int n;
294 if (!tree)
295 return 0;
296 /* full ones */
297 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
298 for (n = 0; n < 31; n++)
299 if (audit_tree_match(p->c[n], tree))
300 return 1;
301 }
302 /* partial */
303 if (p) {
304 for (n = ctx->tree_count; n < 31; n++)
305 if (audit_tree_match(p->c[n], tree))
306 return 1;
307 }
308#endif
309 return 0;
310}
311
ca57ec0f
EB
312static int audit_compare_uid(kuid_t uid,
313 struct audit_names *name,
314 struct audit_field *f,
315 struct audit_context *ctx)
b34b0393
EP
316{
317 struct audit_names *n;
b34b0393 318 int rc;
ca57ec0f 319
b34b0393 320 if (name) {
ca57ec0f 321 rc = audit_uid_comparator(uid, f->op, name->uid);
b34b0393
EP
322 if (rc)
323 return rc;
324 }
ca57ec0f 325
b34b0393
EP
326 if (ctx) {
327 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f
EB
328 rc = audit_uid_comparator(uid, f->op, n->uid);
329 if (rc)
330 return rc;
331 }
332 }
333 return 0;
334}
b34b0393 335
ca57ec0f
EB
336static int audit_compare_gid(kgid_t gid,
337 struct audit_names *name,
338 struct audit_field *f,
339 struct audit_context *ctx)
340{
341 struct audit_names *n;
342 int rc;
343
344 if (name) {
345 rc = audit_gid_comparator(gid, f->op, name->gid);
346 if (rc)
347 return rc;
348 }
349
350 if (ctx) {
351 list_for_each_entry(n, &ctx->names_list, list) {
352 rc = audit_gid_comparator(gid, f->op, n->gid);
b34b0393
EP
353 if (rc)
354 return rc;
355 }
356 }
357 return 0;
358}
359
02d86a56
EP
360static int audit_field_compare(struct task_struct *tsk,
361 const struct cred *cred,
362 struct audit_field *f,
363 struct audit_context *ctx,
364 struct audit_names *name)
365{
02d86a56 366 switch (f->val) {
4a6633ed 367 /* process to file object comparisons */
02d86a56 368 case AUDIT_COMPARE_UID_TO_OBJ_UID:
ca57ec0f 369 return audit_compare_uid(cred->uid, name, f, ctx);
c9fe685f 370 case AUDIT_COMPARE_GID_TO_OBJ_GID:
ca57ec0f 371 return audit_compare_gid(cred->gid, name, f, ctx);
4a6633ed 372 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
ca57ec0f 373 return audit_compare_uid(cred->euid, name, f, ctx);
4a6633ed 374 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
ca57ec0f 375 return audit_compare_gid(cred->egid, name, f, ctx);
4a6633ed 376 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
ca57ec0f 377 return audit_compare_uid(tsk->loginuid, name, f, ctx);
4a6633ed 378 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
ca57ec0f 379 return audit_compare_uid(cred->suid, name, f, ctx);
4a6633ed 380 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
ca57ec0f 381 return audit_compare_gid(cred->sgid, name, f, ctx);
4a6633ed 382 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
ca57ec0f 383 return audit_compare_uid(cred->fsuid, name, f, ctx);
4a6633ed 384 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
ca57ec0f 385 return audit_compare_gid(cred->fsgid, name, f, ctx);
10d68360
PM
386 /* uid comparisons */
387 case AUDIT_COMPARE_UID_TO_AUID:
ca57ec0f 388 return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
10d68360 389 case AUDIT_COMPARE_UID_TO_EUID:
ca57ec0f 390 return audit_uid_comparator(cred->uid, f->op, cred->euid);
10d68360 391 case AUDIT_COMPARE_UID_TO_SUID:
ca57ec0f 392 return audit_uid_comparator(cred->uid, f->op, cred->suid);
10d68360 393 case AUDIT_COMPARE_UID_TO_FSUID:
ca57ec0f 394 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
10d68360
PM
395 /* auid comparisons */
396 case AUDIT_COMPARE_AUID_TO_EUID:
ca57ec0f 397 return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
10d68360 398 case AUDIT_COMPARE_AUID_TO_SUID:
ca57ec0f 399 return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
10d68360 400 case AUDIT_COMPARE_AUID_TO_FSUID:
ca57ec0f 401 return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
10d68360
PM
402 /* euid comparisons */
403 case AUDIT_COMPARE_EUID_TO_SUID:
ca57ec0f 404 return audit_uid_comparator(cred->euid, f->op, cred->suid);
10d68360 405 case AUDIT_COMPARE_EUID_TO_FSUID:
ca57ec0f 406 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
10d68360
PM
407 /* suid comparisons */
408 case AUDIT_COMPARE_SUID_TO_FSUID:
ca57ec0f 409 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
10d68360
PM
410 /* gid comparisons */
411 case AUDIT_COMPARE_GID_TO_EGID:
ca57ec0f 412 return audit_gid_comparator(cred->gid, f->op, cred->egid);
10d68360 413 case AUDIT_COMPARE_GID_TO_SGID:
ca57ec0f 414 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
10d68360 415 case AUDIT_COMPARE_GID_TO_FSGID:
ca57ec0f 416 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
10d68360
PM
417 /* egid comparisons */
418 case AUDIT_COMPARE_EGID_TO_SGID:
ca57ec0f 419 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
10d68360 420 case AUDIT_COMPARE_EGID_TO_FSGID:
ca57ec0f 421 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
10d68360
PM
422 /* sgid comparison */
423 case AUDIT_COMPARE_SGID_TO_FSGID:
ca57ec0f 424 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
02d86a56
EP
425 default:
426 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
427 return 0;
428 }
429 return 0;
430}
431
f368c07d 432/* Determine if any context name data matches a rule's watch data */
1da177e4 433/* Compare a task_struct with an audit_rule. Return 1 on match, 0
f5629883
TJ
434 * otherwise.
435 *
436 * If task_creation is true, this is an explicit indication that we are
437 * filtering a task rule at task creation time. This and tsk == current are
438 * the only situations where tsk->cred may be accessed without an rcu read lock.
439 */
1da177e4 440static int audit_filter_rules(struct task_struct *tsk,
93315ed6 441 struct audit_krule *rule,
1da177e4 442 struct audit_context *ctx,
f368c07d 443 struct audit_names *name,
f5629883
TJ
444 enum audit_state *state,
445 bool task_creation)
1da177e4 446{
f5629883 447 const struct cred *cred;
5195d8e2 448 int i, need_sid = 1;
3dc7e315 449 u32 sid;
8fae4770 450 unsigned int sessionid;
3dc7e315 451
f5629883
TJ
452 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
453
1da177e4 454 for (i = 0; i < rule->field_count; i++) {
93315ed6 455 struct audit_field *f = &rule->fields[i];
5195d8e2 456 struct audit_names *n;
1da177e4 457 int result = 0;
f1dc4867 458 pid_t pid;
1da177e4 459
93315ed6 460 switch (f->type) {
1da177e4 461 case AUDIT_PID:
fa2bea2f 462 pid = task_tgid_nr(tsk);
f1dc4867 463 result = audit_comparator(pid, f->op, f->val);
1da177e4 464 break;
3c66251e 465 case AUDIT_PPID:
419c58f1
AV
466 if (ctx) {
467 if (!ctx->ppid)
c92cdeb4 468 ctx->ppid = task_ppid_nr(tsk);
3c66251e 469 result = audit_comparator(ctx->ppid, f->op, f->val);
419c58f1 470 }
3c66251e 471 break;
34d99af5
RGB
472 case AUDIT_EXE:
473 result = audit_exe_compare(tsk, rule->exe);
474 break;
1da177e4 475 case AUDIT_UID:
ca57ec0f 476 result = audit_uid_comparator(cred->uid, f->op, f->uid);
1da177e4
LT
477 break;
478 case AUDIT_EUID:
ca57ec0f 479 result = audit_uid_comparator(cred->euid, f->op, f->uid);
1da177e4
LT
480 break;
481 case AUDIT_SUID:
ca57ec0f 482 result = audit_uid_comparator(cred->suid, f->op, f->uid);
1da177e4
LT
483 break;
484 case AUDIT_FSUID:
ca57ec0f 485 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
1da177e4
LT
486 break;
487 case AUDIT_GID:
ca57ec0f 488 result = audit_gid_comparator(cred->gid, f->op, f->gid);
37eebe39
MI
489 if (f->op == Audit_equal) {
490 if (!result)
491 result = in_group_p(f->gid);
492 } else if (f->op == Audit_not_equal) {
493 if (result)
494 result = !in_group_p(f->gid);
495 }
1da177e4
LT
496 break;
497 case AUDIT_EGID:
ca57ec0f 498 result = audit_gid_comparator(cred->egid, f->op, f->gid);
37eebe39
MI
499 if (f->op == Audit_equal) {
500 if (!result)
501 result = in_egroup_p(f->gid);
502 } else if (f->op == Audit_not_equal) {
503 if (result)
504 result = !in_egroup_p(f->gid);
505 }
1da177e4
LT
506 break;
507 case AUDIT_SGID:
ca57ec0f 508 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
1da177e4
LT
509 break;
510 case AUDIT_FSGID:
ca57ec0f 511 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
1da177e4 512 break;
8fae4770
RGB
513 case AUDIT_SESSIONID:
514 sessionid = audit_get_sessionid(current);
515 result = audit_comparator(sessionid, f->op, f->val);
516 break;
1da177e4 517 case AUDIT_PERS:
93315ed6 518 result = audit_comparator(tsk->personality, f->op, f->val);
1da177e4 519 break;
2fd6f58b 520 case AUDIT_ARCH:
9f8dbe9c 521 if (ctx)
93315ed6 522 result = audit_comparator(ctx->arch, f->op, f->val);
2fd6f58b 523 break;
1da177e4
LT
524
525 case AUDIT_EXIT:
526 if (ctx && ctx->return_valid)
93315ed6 527 result = audit_comparator(ctx->return_code, f->op, f->val);
1da177e4
LT
528 break;
529 case AUDIT_SUCCESS:
b01f2cc1 530 if (ctx && ctx->return_valid) {
93315ed6
AG
531 if (f->val)
532 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
b01f2cc1 533 else
93315ed6 534 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
b01f2cc1 535 }
1da177e4
LT
536 break;
537 case AUDIT_DEVMAJOR:
16c174bd
EP
538 if (name) {
539 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
540 audit_comparator(MAJOR(name->rdev), f->op, f->val))
541 ++result;
542 } else if (ctx) {
5195d8e2 543 list_for_each_entry(n, &ctx->names_list, list) {
16c174bd
EP
544 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
545 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
1da177e4
LT
546 ++result;
547 break;
548 }
549 }
550 }
551 break;
552 case AUDIT_DEVMINOR:
16c174bd
EP
553 if (name) {
554 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
555 audit_comparator(MINOR(name->rdev), f->op, f->val))
556 ++result;
557 } else if (ctx) {
5195d8e2 558 list_for_each_entry(n, &ctx->names_list, list) {
16c174bd
EP
559 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
560 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
1da177e4
LT
561 ++result;
562 break;
563 }
564 }
565 }
566 break;
567 case AUDIT_INODE:
f368c07d 568 if (name)
db510fc5 569 result = audit_comparator(name->ino, f->op, f->val);
f368c07d 570 else if (ctx) {
5195d8e2
EP
571 list_for_each_entry(n, &ctx->names_list, list) {
572 if (audit_comparator(n->ino, f->op, f->val)) {
1da177e4
LT
573 ++result;
574 break;
575 }
576 }
577 }
578 break;
efaffd6e
EP
579 case AUDIT_OBJ_UID:
580 if (name) {
ca57ec0f 581 result = audit_uid_comparator(name->uid, f->op, f->uid);
efaffd6e
EP
582 } else if (ctx) {
583 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f 584 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
efaffd6e
EP
585 ++result;
586 break;
587 }
588 }
589 }
590 break;
54d3218b
EP
591 case AUDIT_OBJ_GID:
592 if (name) {
ca57ec0f 593 result = audit_gid_comparator(name->gid, f->op, f->gid);
54d3218b
EP
594 } else if (ctx) {
595 list_for_each_entry(n, &ctx->names_list, list) {
ca57ec0f 596 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
54d3218b
EP
597 ++result;
598 break;
599 }
600 }
601 }
602 break;
f368c07d 603 case AUDIT_WATCH:
ae7b8f41
EP
604 if (name)
605 result = audit_watch_compare(rule->watch, name->ino, name->dev);
f368c07d 606 break;
74c3cbe3
AV
607 case AUDIT_DIR:
608 if (ctx)
609 result = match_tree_refs(ctx, rule->tree);
610 break;
1da177e4 611 case AUDIT_LOGINUID:
5c1390c9 612 result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
1da177e4 613 break;
780a7654
EB
614 case AUDIT_LOGINUID_SET:
615 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
616 break;
3a6b9f85
DG
617 case AUDIT_SUBJ_USER:
618 case AUDIT_SUBJ_ROLE:
619 case AUDIT_SUBJ_TYPE:
620 case AUDIT_SUBJ_SEN:
621 case AUDIT_SUBJ_CLR:
3dc7e315
DG
622 /* NOTE: this may return negative values indicating
623 a temporary error. We simply treat this as a
624 match for now to avoid losing information that
625 may be wanted. An error message will also be
626 logged upon error */
04305e4a 627 if (f->lsm_rule) {
2ad312d2 628 if (need_sid) {
2a862b32 629 security_task_getsecid(tsk, &sid);
2ad312d2
SG
630 need_sid = 0;
631 }
d7a96f3a 632 result = security_audit_rule_match(sid, f->type,
3dc7e315 633 f->op,
04305e4a 634 f->lsm_rule,
3dc7e315 635 ctx);
2ad312d2 636 }
3dc7e315 637 break;
6e5a2d1d
DG
638 case AUDIT_OBJ_USER:
639 case AUDIT_OBJ_ROLE:
640 case AUDIT_OBJ_TYPE:
641 case AUDIT_OBJ_LEV_LOW:
642 case AUDIT_OBJ_LEV_HIGH:
643 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
644 also applies here */
04305e4a 645 if (f->lsm_rule) {
6e5a2d1d
DG
646 /* Find files that match */
647 if (name) {
d7a96f3a 648 result = security_audit_rule_match(
6e5a2d1d 649 name->osid, f->type, f->op,
04305e4a 650 f->lsm_rule, ctx);
6e5a2d1d 651 } else if (ctx) {
5195d8e2
EP
652 list_for_each_entry(n, &ctx->names_list, list) {
653 if (security_audit_rule_match(n->osid, f->type,
654 f->op, f->lsm_rule,
655 ctx)) {
6e5a2d1d
DG
656 ++result;
657 break;
658 }
659 }
660 }
661 /* Find ipc objects that match */
a33e6751
AV
662 if (!ctx || ctx->type != AUDIT_IPC)
663 break;
664 if (security_audit_rule_match(ctx->ipc.osid,
665 f->type, f->op,
666 f->lsm_rule, ctx))
667 ++result;
6e5a2d1d
DG
668 }
669 break;
1da177e4
LT
670 case AUDIT_ARG0:
671 case AUDIT_ARG1:
672 case AUDIT_ARG2:
673 case AUDIT_ARG3:
674 if (ctx)
93315ed6 675 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
1da177e4 676 break;
5adc8a6a
AG
677 case AUDIT_FILTERKEY:
678 /* ignore this field for filtering */
679 result = 1;
680 break;
55669bfa
AV
681 case AUDIT_PERM:
682 result = audit_match_perm(ctx, f->val);
683 break;
8b67dca9
AV
684 case AUDIT_FILETYPE:
685 result = audit_match_filetype(ctx, f->val);
686 break;
02d86a56
EP
687 case AUDIT_FIELD_COMPARE:
688 result = audit_field_compare(tsk, cred, f, ctx, name);
689 break;
1da177e4 690 }
f5629883 691 if (!result)
1da177e4
LT
692 return 0;
693 }
0590b933
AV
694
695 if (ctx) {
696 if (rule->prio <= ctx->prio)
697 return 0;
698 if (rule->filterkey) {
699 kfree(ctx->filterkey);
700 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
701 }
702 ctx->prio = rule->prio;
703 }
1da177e4 704 switch (rule->action) {
66b12abc
PM
705 case AUDIT_NEVER:
706 *state = AUDIT_DISABLED;
707 break;
708 case AUDIT_ALWAYS:
709 *state = AUDIT_RECORD_CONTEXT;
710 break;
1da177e4
LT
711 }
712 return 1;
713}
714
715/* At process creation time, we can determine if system-call auditing is
716 * completely disabled for this task. Since we only have the task
717 * structure at this point, we can only check uid and gid.
718 */
e048e02c 719static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
1da177e4
LT
720{
721 struct audit_entry *e;
722 enum audit_state state;
723
724 rcu_read_lock();
0f45aa18 725 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
f5629883
TJ
726 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
727 &state, true)) {
e048e02c
AV
728 if (state == AUDIT_RECORD_CONTEXT)
729 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
1da177e4
LT
730 rcu_read_unlock();
731 return state;
732 }
733 }
734 rcu_read_unlock();
735 return AUDIT_BUILD_CONTEXT;
736}
737
a3c54931
AL
738static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
739{
740 int word, bit;
741
742 if (val > 0xffffffff)
743 return false;
744
745 word = AUDIT_WORD(val);
746 if (word >= AUDIT_BITMASK_SIZE)
747 return false;
748
749 bit = AUDIT_BIT(val);
750
751 return rule->mask[word] & bit;
752}
753
1da177e4
LT
754/* At syscall entry and exit time, this filter is called if the
755 * audit_state is not low enough that auditing cannot take place, but is
23f32d18 756 * also not high enough that we already know we have to write an audit
b0dd25a8 757 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
1da177e4
LT
758 */
759static enum audit_state audit_filter_syscall(struct task_struct *tsk,
760 struct audit_context *ctx,
761 struct list_head *list)
762{
763 struct audit_entry *e;
c3896495 764 enum audit_state state;
1da177e4 765
5b52330b 766 if (auditd_test_task(tsk))
f7056d64
DW
767 return AUDIT_DISABLED;
768
1da177e4 769 rcu_read_lock();
c3896495 770 if (!list_empty(list)) {
b63862f4 771 list_for_each_entry_rcu(e, list, list) {
a3c54931 772 if (audit_in_mask(&e->rule, ctx->major) &&
f368c07d 773 audit_filter_rules(tsk, &e->rule, ctx, NULL,
f5629883 774 &state, false)) {
f368c07d 775 rcu_read_unlock();
0590b933 776 ctx->current_state = state;
f368c07d
AG
777 return state;
778 }
779 }
780 }
781 rcu_read_unlock();
782 return AUDIT_BUILD_CONTEXT;
783}
784
5195d8e2
EP
785/*
786 * Given an audit_name check the inode hash table to see if they match.
787 * Called holding the rcu read lock to protect the use of audit_inode_hash
788 */
789static int audit_filter_inode_name(struct task_struct *tsk,
790 struct audit_names *n,
791 struct audit_context *ctx) {
5195d8e2
EP
792 int h = audit_hash_ino((u32)n->ino);
793 struct list_head *list = &audit_inode_hash[h];
794 struct audit_entry *e;
795 enum audit_state state;
796
5195d8e2
EP
797 if (list_empty(list))
798 return 0;
799
800 list_for_each_entry_rcu(e, list, list) {
a3c54931 801 if (audit_in_mask(&e->rule, ctx->major) &&
5195d8e2
EP
802 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
803 ctx->current_state = state;
804 return 1;
805 }
806 }
807
808 return 0;
809}
810
811/* At syscall exit time, this filter is called if any audit_names have been
f368c07d 812 * collected during syscall processing. We only check rules in sublists at hash
5195d8e2 813 * buckets applicable to the inode numbers in audit_names.
f368c07d
AG
814 * Regarding audit_state, same rules apply as for audit_filter_syscall().
815 */
0590b933 816void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
f368c07d 817{
5195d8e2 818 struct audit_names *n;
f368c07d 819
5b52330b 820 if (auditd_test_task(tsk))
0590b933 821 return;
f368c07d
AG
822
823 rcu_read_lock();
f368c07d 824
5195d8e2
EP
825 list_for_each_entry(n, &ctx->names_list, list) {
826 if (audit_filter_inode_name(tsk, n, ctx))
827 break;
0f45aa18
DW
828 }
829 rcu_read_unlock();
0f45aa18
DW
830}
831
4a3eb726
RGB
832/* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
833static inline struct audit_context *audit_take_context(struct task_struct *tsk,
1da177e4 834 int return_valid,
6d208da8 835 long return_code)
1da177e4
LT
836{
837 struct audit_context *context = tsk->audit_context;
838
56179a6e 839 if (!context)
1da177e4
LT
840 return NULL;
841 context->return_valid = return_valid;
f701b75e
EP
842
843 /*
844 * we need to fix up the return code in the audit logs if the actual
845 * return codes are later going to be fixed up by the arch specific
846 * signal handlers
847 *
848 * This is actually a test for:
849 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
850 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
851 *
852 * but is faster than a bunch of ||
853 */
854 if (unlikely(return_code <= -ERESTARTSYS) &&
855 (return_code >= -ERESTART_RESTARTBLOCK) &&
856 (return_code != -ENOIOCTLCMD))
857 context->return_code = -EINTR;
858 else
859 context->return_code = return_code;
1da177e4 860
0590b933
AV
861 if (context->in_syscall && !context->dummy) {
862 audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
863 audit_filter_inodes(tsk, context);
1da177e4
LT
864 }
865
1da177e4
LT
866 tsk->audit_context = NULL;
867 return context;
868}
869
3f1c8250
WR
870static inline void audit_proctitle_free(struct audit_context *context)
871{
872 kfree(context->proctitle.value);
873 context->proctitle.value = NULL;
874 context->proctitle.len = 0;
875}
876
1da177e4
LT
877static inline void audit_free_names(struct audit_context *context)
878{
5195d8e2 879 struct audit_names *n, *next;
1da177e4 880
5195d8e2
EP
881 list_for_each_entry_safe(n, next, &context->names_list, list) {
882 list_del(&n->list);
55422d0b
PM
883 if (n->name)
884 putname(n->name);
5195d8e2
EP
885 if (n->should_free)
886 kfree(n);
8c8570fb 887 }
1da177e4 888 context->name_count = 0;
44707fdf
JB
889 path_put(&context->pwd);
890 context->pwd.dentry = NULL;
891 context->pwd.mnt = NULL;
1da177e4
LT
892}
893
894static inline void audit_free_aux(struct audit_context *context)
895{
896 struct audit_aux_data *aux;
897
898 while ((aux = context->aux)) {
899 context->aux = aux->next;
900 kfree(aux);
901 }
e54dc243
AG
902 while ((aux = context->aux_pids)) {
903 context->aux_pids = aux->next;
904 kfree(aux);
905 }
1da177e4
LT
906}
907
1da177e4
LT
908static inline struct audit_context *audit_alloc_context(enum audit_state state)
909{
910 struct audit_context *context;
911
17c6ee70
RM
912 context = kzalloc(sizeof(*context), GFP_KERNEL);
913 if (!context)
1da177e4 914 return NULL;
e2c5adc8
AM
915 context->state = state;
916 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
916d7576 917 INIT_LIST_HEAD(&context->killed_trees);
5195d8e2 918 INIT_LIST_HEAD(&context->names_list);
1da177e4
LT
919 return context;
920}
921
b0dd25a8
RD
922/**
923 * audit_alloc - allocate an audit context block for a task
924 * @tsk: task
925 *
926 * Filter on the task information and allocate a per-task audit context
1da177e4
LT
927 * if necessary. Doing so turns on system call auditing for the
928 * specified task. This is called from copy_process, so no lock is
b0dd25a8
RD
929 * needed.
930 */
1da177e4
LT
931int audit_alloc(struct task_struct *tsk)
932{
933 struct audit_context *context;
934 enum audit_state state;
e048e02c 935 char *key = NULL;
1da177e4 936
b593d384 937 if (likely(!audit_ever_enabled))
1da177e4
LT
938 return 0; /* Return if not auditing. */
939
e048e02c 940 state = audit_filter_task(tsk, &key);
d48d8051
ON
941 if (state == AUDIT_DISABLED) {
942 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
1da177e4 943 return 0;
d48d8051 944 }
1da177e4
LT
945
946 if (!(context = audit_alloc_context(state))) {
e048e02c 947 kfree(key);
1da177e4
LT
948 audit_log_lost("out of memory in audit_alloc");
949 return -ENOMEM;
950 }
e048e02c 951 context->filterkey = key;
1da177e4 952
1da177e4
LT
953 tsk->audit_context = context;
954 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
955 return 0;
956}
957
958static inline void audit_free_context(struct audit_context *context)
959{
c62d773a
AV
960 audit_free_names(context);
961 unroll_tree_refs(context, NULL, 0);
962 free_tree_refs(context);
963 audit_free_aux(context);
964 kfree(context->filterkey);
965 kfree(context->sockaddr);
3f1c8250 966 audit_proctitle_free(context);
c62d773a 967 kfree(context);
1da177e4
LT
968}
969
e54dc243 970static int audit_log_pid_context(struct audit_context *context, pid_t pid,
cca080d9 971 kuid_t auid, kuid_t uid, unsigned int sessionid,
4746ec5b 972 u32 sid, char *comm)
e54dc243
AG
973{
974 struct audit_buffer *ab;
2a862b32 975 char *ctx = NULL;
e54dc243
AG
976 u32 len;
977 int rc = 0;
978
979 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
980 if (!ab)
6246ccab 981 return rc;
e54dc243 982
e1760bd5
EB
983 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
984 from_kuid(&init_user_ns, auid),
cca080d9 985 from_kuid(&init_user_ns, uid), sessionid);
ad395abe
EP
986 if (sid) {
987 if (security_secid_to_secctx(sid, &ctx, &len)) {
988 audit_log_format(ab, " obj=(none)");
989 rc = 1;
990 } else {
991 audit_log_format(ab, " obj=%s", ctx);
992 security_release_secctx(ctx, len);
993 }
2a862b32 994 }
c2a7780e
EP
995 audit_log_format(ab, " ocomm=");
996 audit_log_untrustedstring(ab, comm);
e54dc243 997 audit_log_end(ab);
e54dc243
AG
998
999 return rc;
1000}
1001
43761473
PM
1002static void audit_log_execve_info(struct audit_context *context,
1003 struct audit_buffer **ab)
bdf4c48a 1004{
43761473
PM
1005 long len_max;
1006 long len_rem;
1007 long len_full;
1008 long len_buf;
8443075e 1009 long len_abuf = 0;
43761473
PM
1010 long len_tmp;
1011 bool require_data;
1012 bool encode;
1013 unsigned int iter;
1014 unsigned int arg;
1015 char *buf_head;
1016 char *buf;
1017 const char __user *p = (const char __user *)current->mm->arg_start;
1018
1019 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1020 * data we put in the audit record for this argument (see the
1021 * code below) ... at this point in time 96 is plenty */
1022 char abuf[96];
1023
1024 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1025 * current value of 7500 is not as important as the fact that it
1026 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1027 * room if we go over a little bit in the logging below */
1028 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1029 len_max = MAX_EXECVE_AUDIT_LEN;
1030
1031 /* scratch buffer to hold the userspace args */
1032 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1033 if (!buf_head) {
1034 audit_panic("out of memory for argv string");
1035 return;
de6bbd1d 1036 }
43761473 1037 buf = buf_head;
040b3a2d 1038
43761473 1039 audit_log_format(*ab, "argc=%d", context->execve.argc);
040b3a2d 1040
43761473
PM
1041 len_rem = len_max;
1042 len_buf = 0;
1043 len_full = 0;
1044 require_data = true;
1045 encode = false;
1046 iter = 0;
1047 arg = 0;
de6bbd1d 1048 do {
43761473
PM
1049 /* NOTE: we don't ever want to trust this value for anything
1050 * serious, but the audit record format insists we
1051 * provide an argument length for really long arguments,
1052 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1053 * to use strncpy_from_user() to obtain this value for
1054 * recording in the log, although we don't use it
1055 * anywhere here to avoid a double-fetch problem */
1056 if (len_full == 0)
1057 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1058
1059 /* read more data from userspace */
1060 if (require_data) {
1061 /* can we make more room in the buffer? */
1062 if (buf != buf_head) {
1063 memmove(buf_head, buf, len_buf);
1064 buf = buf_head;
1065 }
1066
1067 /* fetch as much as we can of the argument */
1068 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1069 len_max - len_buf);
1070 if (len_tmp == -EFAULT) {
1071 /* unable to copy from userspace */
1072 send_sig(SIGKILL, current, 0);
1073 goto out;
1074 } else if (len_tmp == (len_max - len_buf)) {
1075 /* buffer is not large enough */
1076 require_data = true;
1077 /* NOTE: if we are going to span multiple
1078 * buffers force the encoding so we stand
1079 * a chance at a sane len_full value and
1080 * consistent record encoding */
1081 encode = true;
1082 len_full = len_full * 2;
1083 p += len_tmp;
1084 } else {
1085 require_data = false;
1086 if (!encode)
1087 encode = audit_string_contains_control(
1088 buf, len_tmp);
1089 /* try to use a trusted value for len_full */
1090 if (len_full < len_max)
1091 len_full = (encode ?
1092 len_tmp * 2 : len_tmp);
1093 p += len_tmp + 1;
1094 }
1095 len_buf += len_tmp;
1096 buf_head[len_buf] = '\0';
bdf4c48a 1097
43761473
PM
1098 /* length of the buffer in the audit record? */
1099 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
bdf4c48a 1100 }
de6bbd1d 1101
43761473
PM
1102 /* write as much as we can to the audit log */
1103 if (len_buf > 0) {
1104 /* NOTE: some magic numbers here - basically if we
1105 * can't fit a reasonable amount of data into the
1106 * existing audit buffer, flush it and start with
1107 * a new buffer */
1108 if ((sizeof(abuf) + 8) > len_rem) {
1109 len_rem = len_max;
1110 audit_log_end(*ab);
1111 *ab = audit_log_start(context,
1112 GFP_KERNEL, AUDIT_EXECVE);
1113 if (!*ab)
1114 goto out;
1115 }
bdf4c48a 1116
43761473
PM
1117 /* create the non-arg portion of the arg record */
1118 len_tmp = 0;
1119 if (require_data || (iter > 0) ||
1120 ((len_abuf + sizeof(abuf)) > len_rem)) {
1121 if (iter == 0) {
1122 len_tmp += snprintf(&abuf[len_tmp],
1123 sizeof(abuf) - len_tmp,
1124 " a%d_len=%lu",
1125 arg, len_full);
1126 }
1127 len_tmp += snprintf(&abuf[len_tmp],
1128 sizeof(abuf) - len_tmp,
1129 " a%d[%d]=", arg, iter++);
1130 } else
1131 len_tmp += snprintf(&abuf[len_tmp],
1132 sizeof(abuf) - len_tmp,
1133 " a%d=", arg);
1134 WARN_ON(len_tmp >= sizeof(abuf));
1135 abuf[sizeof(abuf) - 1] = '\0';
1136
1137 /* log the arg in the audit record */
1138 audit_log_format(*ab, "%s", abuf);
1139 len_rem -= len_tmp;
1140 len_tmp = len_buf;
1141 if (encode) {
1142 if (len_abuf > len_rem)
1143 len_tmp = len_rem / 2; /* encoding */
1144 audit_log_n_hex(*ab, buf, len_tmp);
1145 len_rem -= len_tmp * 2;
1146 len_abuf -= len_tmp * 2;
1147 } else {
1148 if (len_abuf > len_rem)
1149 len_tmp = len_rem - 2; /* quotes */
1150 audit_log_n_string(*ab, buf, len_tmp);
1151 len_rem -= len_tmp + 2;
1152 /* don't subtract the "2" because we still need
1153 * to add quotes to the remaining string */
1154 len_abuf -= len_tmp;
1155 }
1156 len_buf -= len_tmp;
1157 buf += len_tmp;
1158 }
bdf4c48a 1159
43761473
PM
1160 /* ready to move to the next argument? */
1161 if ((len_buf == 0) && !require_data) {
1162 arg++;
1163 iter = 0;
1164 len_full = 0;
1165 require_data = true;
1166 encode = false;
1167 }
1168 } while (arg < context->execve.argc);
de6bbd1d 1169
43761473 1170 /* NOTE: the caller handles the final audit_log_end() call */
de6bbd1d 1171
43761473
PM
1172out:
1173 kfree(buf_head);
bdf4c48a
PZ
1174}
1175
a33e6751 1176static void show_special(struct audit_context *context, int *call_panic)
f3298dc4
AV
1177{
1178 struct audit_buffer *ab;
1179 int i;
1180
1181 ab = audit_log_start(context, GFP_KERNEL, context->type);
1182 if (!ab)
1183 return;
1184
1185 switch (context->type) {
1186 case AUDIT_SOCKETCALL: {
1187 int nargs = context->socketcall.nargs;
1188 audit_log_format(ab, "nargs=%d", nargs);
1189 for (i = 0; i < nargs; i++)
1190 audit_log_format(ab, " a%d=%lx", i,
1191 context->socketcall.args[i]);
1192 break; }
a33e6751
AV
1193 case AUDIT_IPC: {
1194 u32 osid = context->ipc.osid;
1195
2570ebbd 1196 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
cca080d9
EB
1197 from_kuid(&init_user_ns, context->ipc.uid),
1198 from_kgid(&init_user_ns, context->ipc.gid),
1199 context->ipc.mode);
a33e6751
AV
1200 if (osid) {
1201 char *ctx = NULL;
1202 u32 len;
1203 if (security_secid_to_secctx(osid, &ctx, &len)) {
1204 audit_log_format(ab, " osid=%u", osid);
1205 *call_panic = 1;
1206 } else {
1207 audit_log_format(ab, " obj=%s", ctx);
1208 security_release_secctx(ctx, len);
1209 }
1210 }
e816f370
AV
1211 if (context->ipc.has_perm) {
1212 audit_log_end(ab);
1213 ab = audit_log_start(context, GFP_KERNEL,
1214 AUDIT_IPC_SET_PERM);
0644ec0c
KC
1215 if (unlikely(!ab))
1216 return;
e816f370 1217 audit_log_format(ab,
2570ebbd 1218 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
e816f370
AV
1219 context->ipc.qbytes,
1220 context->ipc.perm_uid,
1221 context->ipc.perm_gid,
1222 context->ipc.perm_mode);
e816f370 1223 }
a33e6751 1224 break; }
fe8e52b9 1225 case AUDIT_MQ_OPEN:
564f6993 1226 audit_log_format(ab,
df0a4283 1227 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
564f6993
AV
1228 "mq_msgsize=%ld mq_curmsgs=%ld",
1229 context->mq_open.oflag, context->mq_open.mode,
1230 context->mq_open.attr.mq_flags,
1231 context->mq_open.attr.mq_maxmsg,
1232 context->mq_open.attr.mq_msgsize,
1233 context->mq_open.attr.mq_curmsgs);
fe8e52b9
PM
1234 break;
1235 case AUDIT_MQ_SENDRECV:
c32c8af4
AV
1236 audit_log_format(ab,
1237 "mqdes=%d msg_len=%zd msg_prio=%u "
b9047726 1238 "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
c32c8af4
AV
1239 context->mq_sendrecv.mqdes,
1240 context->mq_sendrecv.msg_len,
1241 context->mq_sendrecv.msg_prio,
b9047726 1242 (long long) context->mq_sendrecv.abs_timeout.tv_sec,
c32c8af4 1243 context->mq_sendrecv.abs_timeout.tv_nsec);
fe8e52b9
PM
1244 break;
1245 case AUDIT_MQ_NOTIFY:
20114f71
AV
1246 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1247 context->mq_notify.mqdes,
1248 context->mq_notify.sigev_signo);
fe8e52b9 1249 break;
7392906e
AV
1250 case AUDIT_MQ_GETSETATTR: {
1251 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1252 audit_log_format(ab,
1253 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1254 "mq_curmsgs=%ld ",
1255 context->mq_getsetattr.mqdes,
1256 attr->mq_flags, attr->mq_maxmsg,
1257 attr->mq_msgsize, attr->mq_curmsgs);
1258 break; }
fe8e52b9 1259 case AUDIT_CAPSET:
57f71a0a
AV
1260 audit_log_format(ab, "pid=%d", context->capset.pid);
1261 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1262 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1263 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
7786f6b6 1264 audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
fe8e52b9
PM
1265 break;
1266 case AUDIT_MMAP:
120a795d
AV
1267 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1268 context->mmap.flags);
fe8e52b9
PM
1269 break;
1270 case AUDIT_EXECVE:
d9cfea91 1271 audit_log_execve_info(context, &ab);
fe8e52b9 1272 break;
ca86cad7
RGB
1273 case AUDIT_KERN_MODULE:
1274 audit_log_format(ab, "name=");
1275 audit_log_untrustedstring(ab, context->module.name);
1276 kfree(context->module.name);
1277 break;
f3298dc4
AV
1278 }
1279 audit_log_end(ab);
1280}
1281
3f1c8250
WR
1282static inline int audit_proctitle_rtrim(char *proctitle, int len)
1283{
1284 char *end = proctitle + len - 1;
1285 while (end > proctitle && !isprint(*end))
1286 end--;
1287
1288 /* catch the case where proctitle is only 1 non-print character */
1289 len = end - proctitle + 1;
1290 len -= isprint(proctitle[len-1]) == 0;
1291 return len;
1292}
1293
1294static void audit_log_proctitle(struct task_struct *tsk,
1295 struct audit_context *context)
1296{
1297 int res;
1298 char *buf;
1299 char *msg = "(null)";
1300 int len = strlen(msg);
1301 struct audit_buffer *ab;
1302
1303 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1304 if (!ab)
1305 return; /* audit_panic or being filtered */
1306
1307 audit_log_format(ab, "proctitle=");
1308
1309 /* Not cached */
1310 if (!context->proctitle.value) {
1311 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1312 if (!buf)
1313 goto out;
1314 /* Historically called this from procfs naming */
1315 res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
1316 if (res == 0) {
1317 kfree(buf);
1318 goto out;
1319 }
1320 res = audit_proctitle_rtrim(buf, res);
1321 if (res == 0) {
1322 kfree(buf);
1323 goto out;
1324 }
1325 context->proctitle.value = buf;
1326 context->proctitle.len = res;
1327 }
1328 msg = context->proctitle.value;
1329 len = context->proctitle.len;
1330out:
1331 audit_log_n_untrustedstring(ab, msg, len);
1332 audit_log_end(ab);
1333}
1334
e495149b 1335static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1da177e4 1336{
9c7aa6aa 1337 int i, call_panic = 0;
1da177e4 1338 struct audit_buffer *ab;
7551ced3 1339 struct audit_aux_data *aux;
5195d8e2 1340 struct audit_names *n;
1da177e4 1341
e495149b 1342 /* tsk == current */
3f2792ff 1343 context->personality = tsk->personality;
e495149b
AV
1344
1345 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1da177e4
LT
1346 if (!ab)
1347 return; /* audit_panic has been called */
bccf6ae0
DW
1348 audit_log_format(ab, "arch=%x syscall=%d",
1349 context->arch, context->major);
1da177e4
LT
1350 if (context->personality != PER_LINUX)
1351 audit_log_format(ab, " per=%lx", context->personality);
1352 if (context->return_valid)
9f8dbe9c 1353 audit_log_format(ab, " success=%s exit=%ld",
2fd6f58b
DW
1354 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1355 context->return_code);
eb84a20e 1356
1da177e4 1357 audit_log_format(ab,
e23eb920
PM
1358 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1359 context->argv[0],
1360 context->argv[1],
1361 context->argv[2],
1362 context->argv[3],
1363 context->name_count);
eb84a20e 1364
e495149b 1365 audit_log_task_info(ab, tsk);
9d960985 1366 audit_log_key(ab, context->filterkey);
1da177e4 1367 audit_log_end(ab);
1da177e4 1368
7551ced3 1369 for (aux = context->aux; aux; aux = aux->next) {
c0404993 1370
e495149b 1371 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1da177e4
LT
1372 if (!ab)
1373 continue; /* audit_panic has been called */
1374
1da177e4 1375 switch (aux->type) {
20ca73bc 1376
3fc689e9
EP
1377 case AUDIT_BPRM_FCAPS: {
1378 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1379 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1380 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1381 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1382 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1383 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1384 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1385 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
7786f6b6
RGB
1386 audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
1387 audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
1388 audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
1389 audit_log_cap(ab, "pe", &axs->new_pcap.effective);
1390 audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
3fc689e9
EP
1391 break; }
1392
1da177e4
LT
1393 }
1394 audit_log_end(ab);
1da177e4
LT
1395 }
1396
f3298dc4 1397 if (context->type)
a33e6751 1398 show_special(context, &call_panic);
f3298dc4 1399
157cf649
AV
1400 if (context->fds[0] >= 0) {
1401 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1402 if (ab) {
1403 audit_log_format(ab, "fd0=%d fd1=%d",
1404 context->fds[0], context->fds[1]);
1405 audit_log_end(ab);
1406 }
1407 }
1408
4f6b434f
AV
1409 if (context->sockaddr_len) {
1410 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1411 if (ab) {
1412 audit_log_format(ab, "saddr=");
1413 audit_log_n_hex(ab, (void *)context->sockaddr,
1414 context->sockaddr_len);
1415 audit_log_end(ab);
1416 }
1417 }
1418
e54dc243
AG
1419 for (aux = context->aux_pids; aux; aux = aux->next) {
1420 struct audit_aux_data_pids *axs = (void *)aux;
e54dc243
AG
1421
1422 for (i = 0; i < axs->pid_count; i++)
1423 if (audit_log_pid_context(context, axs->target_pid[i],
c2a7780e
EP
1424 axs->target_auid[i],
1425 axs->target_uid[i],
4746ec5b 1426 axs->target_sessionid[i],
c2a7780e
EP
1427 axs->target_sid[i],
1428 axs->target_comm[i]))
e54dc243 1429 call_panic = 1;
a5cb013d
AV
1430 }
1431
e54dc243
AG
1432 if (context->target_pid &&
1433 audit_log_pid_context(context, context->target_pid,
c2a7780e 1434 context->target_auid, context->target_uid,
4746ec5b 1435 context->target_sessionid,
c2a7780e 1436 context->target_sid, context->target_comm))
e54dc243
AG
1437 call_panic = 1;
1438
44707fdf 1439 if (context->pwd.dentry && context->pwd.mnt) {
e495149b 1440 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
8f37d47c 1441 if (ab) {
0b7a0fdb 1442 audit_log_d_path(ab, "cwd=", &context->pwd);
8f37d47c
DW
1443 audit_log_end(ab);
1444 }
1445 }
73241ccc 1446
5195d8e2 1447 i = 0;
79f6530c
JL
1448 list_for_each_entry(n, &context->names_list, list) {
1449 if (n->hidden)
1450 continue;
b24a30a7 1451 audit_log_name(context, n, NULL, i++, &call_panic);
79f6530c 1452 }
c0641f28 1453
3f1c8250
WR
1454 audit_log_proctitle(tsk, context);
1455
c0641f28
EP
1456 /* Send end of event record to help user space know we are finished */
1457 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1458 if (ab)
1459 audit_log_end(ab);
9c7aa6aa
SG
1460 if (call_panic)
1461 audit_panic("error converting sid to string");
1da177e4
LT
1462}
1463
b0dd25a8 1464/**
196a5085 1465 * __audit_free - free a per-task audit context
b0dd25a8
RD
1466 * @tsk: task whose audit context block to free
1467 *
fa84cb93 1468 * Called from copy_process and do_exit
b0dd25a8 1469 */
a4ff8dba 1470void __audit_free(struct task_struct *tsk)
1da177e4
LT
1471{
1472 struct audit_context *context;
1473
4a3eb726 1474 context = audit_take_context(tsk, 0, 0);
56179a6e 1475 if (!context)
1da177e4
LT
1476 return;
1477
1478 /* Check for system calls that do not go through the exit
9f8dbe9c
DW
1479 * function (e.g., exit_group), then free context block.
1480 * We use GFP_ATOMIC here because we might be doing this
f5561964 1481 * in the context of the idle thread */
e495149b 1482 /* that can happen only if we are called from do_exit() */
0590b933 1483 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
e495149b 1484 audit_log_exit(context, tsk);
916d7576
AV
1485 if (!list_empty(&context->killed_trees))
1486 audit_kill_trees(&context->killed_trees);
1da177e4
LT
1487
1488 audit_free_context(context);
1489}
1490
b0dd25a8 1491/**
196a5085 1492 * __audit_syscall_entry - fill in an audit record at syscall entry
b0dd25a8
RD
1493 * @major: major syscall type (function)
1494 * @a1: additional syscall register 1
1495 * @a2: additional syscall register 2
1496 * @a3: additional syscall register 3
1497 * @a4: additional syscall register 4
1498 *
1499 * Fill in audit context at syscall entry. This only happens if the
1da177e4
LT
1500 * audit context was created when the task was created and the state or
1501 * filters demand the audit context be built. If the state from the
1502 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1503 * then the record will be written at syscall exit time (otherwise, it
1504 * will only be written if another part of the kernel requests that it
b0dd25a8
RD
1505 * be written).
1506 */
b4f0d375
RGB
1507void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1508 unsigned long a3, unsigned long a4)
1da177e4 1509{
5411be59 1510 struct task_struct *tsk = current;
1da177e4
LT
1511 struct audit_context *context = tsk->audit_context;
1512 enum audit_state state;
1513
56179a6e 1514 if (!context)
86a1c34a 1515 return;
1da177e4 1516
1da177e4
LT
1517 BUG_ON(context->in_syscall || context->name_count);
1518
1519 if (!audit_enabled)
1520 return;
1521
4a99854c 1522 context->arch = syscall_get_arch();
1da177e4
LT
1523 context->major = major;
1524 context->argv[0] = a1;
1525 context->argv[1] = a2;
1526 context->argv[2] = a3;
1527 context->argv[3] = a4;
1528
1529 state = context->state;
d51374ad 1530 context->dummy = !audit_n_rules;
0590b933
AV
1531 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1532 context->prio = 0;
0f45aa18 1533 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
0590b933 1534 }
56179a6e 1535 if (state == AUDIT_DISABLED)
1da177e4
LT
1536 return;
1537
ce625a80 1538 context->serial = 0;
e832bf48 1539 context->ctime = current_kernel_time64();
1da177e4 1540 context->in_syscall = 1;
0590b933 1541 context->current_state = state;
419c58f1 1542 context->ppid = 0;
1da177e4
LT
1543}
1544
b0dd25a8 1545/**
196a5085 1546 * __audit_syscall_exit - deallocate audit context after a system call
42ae610c
RD
1547 * @success: success value of the syscall
1548 * @return_code: return value of the syscall
b0dd25a8
RD
1549 *
1550 * Tear down after system call. If the audit context has been marked as
1da177e4 1551 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
42ae610c 1552 * filtering, or because some other part of the kernel wrote an audit
1da177e4 1553 * message), then write out the syscall information. In call cases,
b0dd25a8
RD
1554 * free the names stored from getname().
1555 */
d7e7528b 1556void __audit_syscall_exit(int success, long return_code)
1da177e4 1557{
5411be59 1558 struct task_struct *tsk = current;
1da177e4
LT
1559 struct audit_context *context;
1560
d7e7528b
EP
1561 if (success)
1562 success = AUDITSC_SUCCESS;
1563 else
1564 success = AUDITSC_FAILURE;
1da177e4 1565
4a3eb726 1566 context = audit_take_context(tsk, success, return_code);
56179a6e 1567 if (!context)
97e94c45 1568 return;
1da177e4 1569
0590b933 1570 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
e495149b 1571 audit_log_exit(context, tsk);
1da177e4
LT
1572
1573 context->in_syscall = 0;
0590b933 1574 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
2fd6f58b 1575
916d7576
AV
1576 if (!list_empty(&context->killed_trees))
1577 audit_kill_trees(&context->killed_trees);
1578
c62d773a
AV
1579 audit_free_names(context);
1580 unroll_tree_refs(context, NULL, 0);
1581 audit_free_aux(context);
1582 context->aux = NULL;
1583 context->aux_pids = NULL;
1584 context->target_pid = 0;
1585 context->target_sid = 0;
1586 context->sockaddr_len = 0;
1587 context->type = 0;
1588 context->fds[0] = -1;
1589 if (context->state != AUDIT_RECORD_CONTEXT) {
1590 kfree(context->filterkey);
1591 context->filterkey = NULL;
1da177e4 1592 }
c62d773a 1593 tsk->audit_context = context;
1da177e4
LT
1594}
1595
74c3cbe3
AV
1596static inline void handle_one(const struct inode *inode)
1597{
1598#ifdef CONFIG_AUDIT_TREE
1599 struct audit_context *context;
1600 struct audit_tree_refs *p;
1601 struct audit_chunk *chunk;
1602 int count;
08991e83 1603 if (likely(!inode->i_fsnotify_marks))
74c3cbe3
AV
1604 return;
1605 context = current->audit_context;
1606 p = context->trees;
1607 count = context->tree_count;
1608 rcu_read_lock();
1609 chunk = audit_tree_lookup(inode);
1610 rcu_read_unlock();
1611 if (!chunk)
1612 return;
1613 if (likely(put_tree_ref(context, chunk)))
1614 return;
1615 if (unlikely(!grow_tree_refs(context))) {
f952d10f 1616 pr_warn("out of memory, audit has lost a tree reference\n");
74c3cbe3
AV
1617 audit_set_auditable(context);
1618 audit_put_chunk(chunk);
1619 unroll_tree_refs(context, p, count);
1620 return;
1621 }
1622 put_tree_ref(context, chunk);
1623#endif
1624}
1625
1626static void handle_path(const struct dentry *dentry)
1627{
1628#ifdef CONFIG_AUDIT_TREE
1629 struct audit_context *context;
1630 struct audit_tree_refs *p;
1631 const struct dentry *d, *parent;
1632 struct audit_chunk *drop;
1633 unsigned long seq;
1634 int count;
1635
1636 context = current->audit_context;
1637 p = context->trees;
1638 count = context->tree_count;
1639retry:
1640 drop = NULL;
1641 d = dentry;
1642 rcu_read_lock();
1643 seq = read_seqbegin(&rename_lock);
1644 for(;;) {
3b362157 1645 struct inode *inode = d_backing_inode(d);
08991e83 1646 if (inode && unlikely(inode->i_fsnotify_marks)) {
74c3cbe3
AV
1647 struct audit_chunk *chunk;
1648 chunk = audit_tree_lookup(inode);
1649 if (chunk) {
1650 if (unlikely(!put_tree_ref(context, chunk))) {
1651 drop = chunk;
1652 break;
1653 }
1654 }
1655 }
1656 parent = d->d_parent;
1657 if (parent == d)
1658 break;
1659 d = parent;
1660 }
1661 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1662 rcu_read_unlock();
1663 if (!drop) {
1664 /* just a race with rename */
1665 unroll_tree_refs(context, p, count);
1666 goto retry;
1667 }
1668 audit_put_chunk(drop);
1669 if (grow_tree_refs(context)) {
1670 /* OK, got more space */
1671 unroll_tree_refs(context, p, count);
1672 goto retry;
1673 }
1674 /* too bad */
f952d10f 1675 pr_warn("out of memory, audit has lost a tree reference\n");
74c3cbe3
AV
1676 unroll_tree_refs(context, p, count);
1677 audit_set_auditable(context);
1678 return;
1679 }
1680 rcu_read_unlock();
1681#endif
1682}
1683
78e2e802
JL
1684static struct audit_names *audit_alloc_name(struct audit_context *context,
1685 unsigned char type)
5195d8e2
EP
1686{
1687 struct audit_names *aname;
1688
1689 if (context->name_count < AUDIT_NAMES) {
1690 aname = &context->preallocated_names[context->name_count];
1691 memset(aname, 0, sizeof(*aname));
1692 } else {
1693 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1694 if (!aname)
1695 return NULL;
1696 aname->should_free = true;
1697 }
1698
84cb777e 1699 aname->ino = AUDIT_INO_UNSET;
78e2e802 1700 aname->type = type;
5195d8e2
EP
1701 list_add_tail(&aname->list, &context->names_list);
1702
1703 context->name_count++;
5195d8e2
EP
1704 return aname;
1705}
1706
7ac86265 1707/**
196a5085 1708 * __audit_reusename - fill out filename with info from existing entry
7ac86265
JL
1709 * @uptr: userland ptr to pathname
1710 *
1711 * Search the audit_names list for the current audit context. If there is an
1712 * existing entry with a matching "uptr" then return the filename
1713 * associated with that audit_name. If not, return NULL.
1714 */
1715struct filename *
1716__audit_reusename(const __user char *uptr)
1717{
1718 struct audit_context *context = current->audit_context;
1719 struct audit_names *n;
1720
1721 list_for_each_entry(n, &context->names_list, list) {
1722 if (!n->name)
1723 continue;
55422d0b
PM
1724 if (n->name->uptr == uptr) {
1725 n->name->refcnt++;
7ac86265 1726 return n->name;
55422d0b 1727 }
7ac86265
JL
1728 }
1729 return NULL;
1730}
1731
b0dd25a8 1732/**
196a5085 1733 * __audit_getname - add a name to the list
b0dd25a8
RD
1734 * @name: name to add
1735 *
1736 * Add a name to the list of audit names for this context.
1737 * Called from fs/namei.c:getname().
1738 */
91a27b2a 1739void __audit_getname(struct filename *name)
1da177e4
LT
1740{
1741 struct audit_context *context = current->audit_context;
5195d8e2 1742 struct audit_names *n;
1da177e4 1743
55422d0b 1744 if (!context->in_syscall)
1da177e4 1745 return;
91a27b2a 1746
78e2e802 1747 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
5195d8e2
EP
1748 if (!n)
1749 return;
1750
1751 n->name = name;
1752 n->name_len = AUDIT_NAME_FULL;
adb5c247 1753 name->aname = n;
55422d0b 1754 name->refcnt++;
5195d8e2 1755
f7ad3c6b
MS
1756 if (!context->pwd.dentry)
1757 get_fs_pwd(current->fs, &context->pwd);
1da177e4
LT
1758}
1759
b0dd25a8 1760/**
bfcec708 1761 * __audit_inode - store the inode and device from a lookup
b0dd25a8 1762 * @name: name being audited
481968f4 1763 * @dentry: dentry being audited
79f6530c 1764 * @flags: attributes for this particular entry
b0dd25a8 1765 */
adb5c247 1766void __audit_inode(struct filename *name, const struct dentry *dentry,
79f6530c 1767 unsigned int flags)
1da177e4 1768{
1da177e4 1769 struct audit_context *context = current->audit_context;
d6335d77 1770 struct inode *inode = d_backing_inode(dentry);
5195d8e2 1771 struct audit_names *n;
79f6530c 1772 bool parent = flags & AUDIT_INODE_PARENT;
1da177e4
LT
1773
1774 if (!context->in_syscall)
1775 return;
5195d8e2 1776
9cec9d68
JL
1777 if (!name)
1778 goto out_alloc;
1779
adb5c247
JL
1780 /*
1781 * If we have a pointer to an audit_names entry already, then we can
1782 * just use it directly if the type is correct.
1783 */
1784 n = name->aname;
1785 if (n) {
1786 if (parent) {
1787 if (n->type == AUDIT_TYPE_PARENT ||
1788 n->type == AUDIT_TYPE_UNKNOWN)
1789 goto out;
1790 } else {
1791 if (n->type != AUDIT_TYPE_PARENT)
1792 goto out;
1793 }
1794 }
1795
5195d8e2 1796 list_for_each_entry_reverse(n, &context->names_list, list) {
57c59f58
PM
1797 if (n->ino) {
1798 /* valid inode number, use that for the comparison */
1799 if (n->ino != inode->i_ino ||
1800 n->dev != inode->i_sb->s_dev)
1801 continue;
1802 } else if (n->name) {
1803 /* inode number has not been set, check the name */
1804 if (strcmp(n->name->name, name->name))
1805 continue;
1806 } else
1807 /* no inode and no name (?!) ... this is odd ... */
bfcec708
JL
1808 continue;
1809
1810 /* match the correct record type */
1811 if (parent) {
1812 if (n->type == AUDIT_TYPE_PARENT ||
1813 n->type == AUDIT_TYPE_UNKNOWN)
1814 goto out;
1815 } else {
1816 if (n->type != AUDIT_TYPE_PARENT)
1817 goto out;
1818 }
1da177e4 1819 }
5195d8e2 1820
9cec9d68 1821out_alloc:
4a928436
PM
1822 /* unable to find an entry with both a matching name and type */
1823 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
5195d8e2
EP
1824 if (!n)
1825 return;
fcf22d82 1826 if (name) {
fd3522fd 1827 n->name = name;
55422d0b 1828 name->refcnt++;
fcf22d82 1829 }
4a928436 1830
5195d8e2 1831out:
bfcec708 1832 if (parent) {
91a27b2a 1833 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
bfcec708 1834 n->type = AUDIT_TYPE_PARENT;
79f6530c
JL
1835 if (flags & AUDIT_INODE_HIDDEN)
1836 n->hidden = true;
bfcec708
JL
1837 } else {
1838 n->name_len = AUDIT_NAME_FULL;
1839 n->type = AUDIT_TYPE_NORMAL;
1840 }
74c3cbe3 1841 handle_path(dentry);
5195d8e2 1842 audit_copy_inode(n, dentry, inode);
73241ccc
AG
1843}
1844
9f45f5bf
AV
1845void __audit_file(const struct file *file)
1846{
1847 __audit_inode(NULL, file->f_path.dentry, 0);
1848}
1849
73241ccc 1850/**
c43a25ab 1851 * __audit_inode_child - collect inode info for created/removed objects
73d3ec5a 1852 * @parent: inode of dentry parent
c43a25ab 1853 * @dentry: dentry being audited
4fa6b5ec 1854 * @type: AUDIT_TYPE_* value that we're looking for
73241ccc
AG
1855 *
1856 * For syscalls that create or remove filesystem objects, audit_inode
1857 * can only collect information for the filesystem object's parent.
1858 * This call updates the audit context with the child's information.
1859 * Syscalls that create a new filesystem object must be hooked after
1860 * the object is created. Syscalls that remove a filesystem object
1861 * must be hooked prior, in order to capture the target inode during
1862 * unsuccessful attempts.
1863 */
d6335d77 1864void __audit_inode_child(struct inode *parent,
4fa6b5ec
JL
1865 const struct dentry *dentry,
1866 const unsigned char type)
73241ccc 1867{
73241ccc 1868 struct audit_context *context = current->audit_context;
d6335d77 1869 struct inode *inode = d_backing_inode(dentry);
cccc6bba 1870 const char *dname = dentry->d_name.name;
4fa6b5ec 1871 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
42d5e376
RGB
1872 struct audit_entry *e;
1873 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
1874 int i;
73241ccc
AG
1875
1876 if (!context->in_syscall)
1877 return;
1878
42d5e376
RGB
1879 rcu_read_lock();
1880 if (!list_empty(list)) {
1881 list_for_each_entry_rcu(e, list, list) {
1882 for (i = 0; i < e->rule.field_count; i++) {
1883 struct audit_field *f = &e->rule.fields[i];
1884
1885 if (f->type == AUDIT_FSTYPE) {
1886 if (audit_comparator(parent->i_sb->s_magic,
1887 f->op, f->val)) {
1888 if (e->rule.action == AUDIT_NEVER) {
1889 rcu_read_unlock();
1890 return;
1891 }
1892 }
1893 }
1894 }
1895 }
1896 }
1897 rcu_read_unlock();
1898
74c3cbe3
AV
1899 if (inode)
1900 handle_one(inode);
73241ccc 1901
4fa6b5ec 1902 /* look for a parent entry first */
5195d8e2 1903 list_for_each_entry(n, &context->names_list, list) {
57c59f58
PM
1904 if (!n->name ||
1905 (n->type != AUDIT_TYPE_PARENT &&
1906 n->type != AUDIT_TYPE_UNKNOWN))
5712e88f
AG
1907 continue;
1908
57c59f58
PM
1909 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
1910 !audit_compare_dname_path(dname,
1911 n->name->name, n->name_len)) {
1912 if (n->type == AUDIT_TYPE_UNKNOWN)
1913 n->type = AUDIT_TYPE_PARENT;
4fa6b5ec
JL
1914 found_parent = n;
1915 break;
f368c07d 1916 }
5712e88f 1917 }
73241ccc 1918
4fa6b5ec 1919 /* is there a matching child entry? */
5195d8e2 1920 list_for_each_entry(n, &context->names_list, list) {
4fa6b5ec 1921 /* can only match entries that have a name */
57c59f58
PM
1922 if (!n->name ||
1923 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
5712e88f
AG
1924 continue;
1925
91a27b2a
JL
1926 if (!strcmp(dname, n->name->name) ||
1927 !audit_compare_dname_path(dname, n->name->name,
4fa6b5ec
JL
1928 found_parent ?
1929 found_parent->name_len :
e3d6b07b 1930 AUDIT_NAME_FULL)) {
57c59f58
PM
1931 if (n->type == AUDIT_TYPE_UNKNOWN)
1932 n->type = type;
4fa6b5ec
JL
1933 found_child = n;
1934 break;
5712e88f 1935 }
ac9910ce 1936 }
5712e88f 1937
5712e88f 1938 if (!found_parent) {
4fa6b5ec
JL
1939 /* create a new, "anonymous" parent record */
1940 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
5195d8e2 1941 if (!n)
ac9910ce 1942 return;
5195d8e2 1943 audit_copy_inode(n, NULL, parent);
73d3ec5a 1944 }
5712e88f
AG
1945
1946 if (!found_child) {
4fa6b5ec
JL
1947 found_child = audit_alloc_name(context, type);
1948 if (!found_child)
5712e88f 1949 return;
5712e88f
AG
1950
1951 /* Re-use the name belonging to the slot for a matching parent
1952 * directory. All names for this context are relinquished in
1953 * audit_free_names() */
1954 if (found_parent) {
4fa6b5ec
JL
1955 found_child->name = found_parent->name;
1956 found_child->name_len = AUDIT_NAME_FULL;
55422d0b 1957 found_child->name->refcnt++;
5712e88f 1958 }
5712e88f 1959 }
57c59f58 1960
4fa6b5ec
JL
1961 if (inode)
1962 audit_copy_inode(found_child, dentry, inode);
1963 else
84cb777e 1964 found_child->ino = AUDIT_INO_UNSET;
3e2efce0 1965}
50e437d5 1966EXPORT_SYMBOL_GPL(__audit_inode_child);
3e2efce0 1967
b0dd25a8
RD
1968/**
1969 * auditsc_get_stamp - get local copies of audit_context values
1970 * @ctx: audit_context for the task
2115bb25 1971 * @t: timespec64 to store time recorded in the audit_context
b0dd25a8
RD
1972 * @serial: serial value that is recorded in the audit_context
1973 *
1974 * Also sets the context as auditable.
1975 */
48887e63 1976int auditsc_get_stamp(struct audit_context *ctx,
2115bb25 1977 struct timespec64 *t, unsigned int *serial)
1da177e4 1978{
48887e63
AV
1979 if (!ctx->in_syscall)
1980 return 0;
ce625a80
DW
1981 if (!ctx->serial)
1982 ctx->serial = audit_serial();
bfb4496e
DW
1983 t->tv_sec = ctx->ctime.tv_sec;
1984 t->tv_nsec = ctx->ctime.tv_nsec;
1985 *serial = ctx->serial;
0590b933
AV
1986 if (!ctx->prio) {
1987 ctx->prio = 1;
1988 ctx->current_state = AUDIT_RECORD_CONTEXT;
1989 }
48887e63 1990 return 1;
1da177e4
LT
1991}
1992
4746ec5b
EP
1993/* global counter which is incremented every time something logs in */
1994static atomic_t session_id = ATOMIC_INIT(0);
1995
da0a6104
EP
1996static int audit_set_loginuid_perm(kuid_t loginuid)
1997{
da0a6104
EP
1998 /* if we are unset, we don't need privs */
1999 if (!audit_loginuid_set(current))
2000 return 0;
21b85c31
EP
2001 /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
2002 if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
2003 return -EPERM;
83fa6bbe
EP
2004 /* it is set, you need permission */
2005 if (!capable(CAP_AUDIT_CONTROL))
2006 return -EPERM;
d040e5af
EP
2007 /* reject if this is not an unset and we don't allow that */
2008 if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
2009 return -EPERM;
83fa6bbe 2010 return 0;
da0a6104
EP
2011}
2012
2013static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
2014 unsigned int oldsessionid, unsigned int sessionid,
2015 int rc)
2016{
2017 struct audit_buffer *ab;
5ee9a75c 2018 uid_t uid, oldloginuid, loginuid;
db0a6fb5 2019 struct tty_struct *tty;
da0a6104 2020
c2412d91
G
2021 if (!audit_enabled)
2022 return;
2023
76a658c2
RGB
2024 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
2025 if (!ab)
2026 return;
2027
da0a6104 2028 uid = from_kuid(&init_user_ns, task_uid(current));
5ee9a75c
RGB
2029 oldloginuid = from_kuid(&init_user_ns, koldloginuid);
2030 loginuid = from_kuid(&init_user_ns, kloginuid),
db0a6fb5 2031 tty = audit_get_tty(current);
da0a6104 2032
fa2bea2f 2033 audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
ddfad8af 2034 audit_log_task_context(ab);
db0a6fb5
RGB
2035 audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
2036 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
2037 oldsessionid, sessionid, !rc);
2038 audit_put_tty(tty);
da0a6104
EP
2039 audit_log_end(ab);
2040}
2041
b0dd25a8 2042/**
0a300be6 2043 * audit_set_loginuid - set current task's audit_context loginuid
b0dd25a8
RD
2044 * @loginuid: loginuid value
2045 *
2046 * Returns 0.
2047 *
2048 * Called (set) from fs/proc/base.c::proc_loginuid_write().
2049 */
e1760bd5 2050int audit_set_loginuid(kuid_t loginuid)
1da177e4 2051{
0a300be6 2052 struct task_struct *task = current;
9175c9d2
EP
2053 unsigned int oldsessionid, sessionid = (unsigned int)-1;
2054 kuid_t oldloginuid;
da0a6104 2055 int rc;
41757106 2056
da0a6104
EP
2057 oldloginuid = audit_get_loginuid(current);
2058 oldsessionid = audit_get_sessionid(current);
2059
2060 rc = audit_set_loginuid_perm(loginuid);
2061 if (rc)
2062 goto out;
633b4545 2063
81407c84 2064 /* are we setting or clearing? */
833fc48d 2065 if (uid_valid(loginuid)) {
4440e854 2066 sessionid = (unsigned int)atomic_inc_return(&session_id);
833fc48d
RGB
2067 if (unlikely(sessionid == (unsigned int)-1))
2068 sessionid = (unsigned int)atomic_inc_return(&session_id);
2069 }
bfef93a5 2070
4746ec5b 2071 task->sessionid = sessionid;
bfef93a5 2072 task->loginuid = loginuid;
da0a6104
EP
2073out:
2074 audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2075 return rc;
1da177e4
LT
2076}
2077
20ca73bc
GW
2078/**
2079 * __audit_mq_open - record audit data for a POSIX MQ open
2080 * @oflag: open flag
2081 * @mode: mode bits
6b962559 2082 * @attr: queue attributes
20ca73bc 2083 *
20ca73bc 2084 */
df0a4283 2085void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
20ca73bc 2086{
20ca73bc
GW
2087 struct audit_context *context = current->audit_context;
2088
564f6993
AV
2089 if (attr)
2090 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2091 else
2092 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
20ca73bc 2093
564f6993
AV
2094 context->mq_open.oflag = oflag;
2095 context->mq_open.mode = mode;
20ca73bc 2096
564f6993 2097 context->type = AUDIT_MQ_OPEN;
20ca73bc
GW
2098}
2099
2100/**
c32c8af4 2101 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
20ca73bc
GW
2102 * @mqdes: MQ descriptor
2103 * @msg_len: Message length
2104 * @msg_prio: Message priority
c32c8af4 2105 * @abs_timeout: Message timeout in absolute time
20ca73bc 2106 *
20ca73bc 2107 */
c32c8af4 2108void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
b9047726 2109 const struct timespec64 *abs_timeout)
20ca73bc 2110{
20ca73bc 2111 struct audit_context *context = current->audit_context;
b9047726 2112 struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
20ca73bc 2113
c32c8af4 2114 if (abs_timeout)
b9047726 2115 memcpy(p, abs_timeout, sizeof(*p));
c32c8af4 2116 else
b9047726 2117 memset(p, 0, sizeof(*p));
20ca73bc 2118
c32c8af4
AV
2119 context->mq_sendrecv.mqdes = mqdes;
2120 context->mq_sendrecv.msg_len = msg_len;
2121 context->mq_sendrecv.msg_prio = msg_prio;
20ca73bc 2122
c32c8af4 2123 context->type = AUDIT_MQ_SENDRECV;
20ca73bc
GW
2124}
2125
2126/**
2127 * __audit_mq_notify - record audit data for a POSIX MQ notify
2128 * @mqdes: MQ descriptor
6b962559 2129 * @notification: Notification event
20ca73bc 2130 *
20ca73bc
GW
2131 */
2132
20114f71 2133void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
20ca73bc 2134{
20ca73bc
GW
2135 struct audit_context *context = current->audit_context;
2136
20114f71
AV
2137 if (notification)
2138 context->mq_notify.sigev_signo = notification->sigev_signo;
2139 else
2140 context->mq_notify.sigev_signo = 0;
20ca73bc 2141
20114f71
AV
2142 context->mq_notify.mqdes = mqdes;
2143 context->type = AUDIT_MQ_NOTIFY;
20ca73bc
GW
2144}
2145
2146/**
2147 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2148 * @mqdes: MQ descriptor
2149 * @mqstat: MQ flags
2150 *
20ca73bc 2151 */
7392906e 2152void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
20ca73bc 2153{
20ca73bc 2154 struct audit_context *context = current->audit_context;
7392906e
AV
2155 context->mq_getsetattr.mqdes = mqdes;
2156 context->mq_getsetattr.mqstat = *mqstat;
2157 context->type = AUDIT_MQ_GETSETATTR;
20ca73bc
GW
2158}
2159
b0dd25a8 2160/**
196a5085 2161 * __audit_ipc_obj - record audit data for ipc object
073115d6
SG
2162 * @ipcp: ipc permissions
2163 *
073115d6 2164 */
a33e6751 2165void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
073115d6 2166{
073115d6 2167 struct audit_context *context = current->audit_context;
a33e6751
AV
2168 context->ipc.uid = ipcp->uid;
2169 context->ipc.gid = ipcp->gid;
2170 context->ipc.mode = ipcp->mode;
e816f370 2171 context->ipc.has_perm = 0;
a33e6751
AV
2172 security_ipc_getsecid(ipcp, &context->ipc.osid);
2173 context->type = AUDIT_IPC;
073115d6
SG
2174}
2175
2176/**
196a5085 2177 * __audit_ipc_set_perm - record audit data for new ipc permissions
b0dd25a8
RD
2178 * @qbytes: msgq bytes
2179 * @uid: msgq user id
2180 * @gid: msgq group id
2181 * @mode: msgq mode (permissions)
2182 *
e816f370 2183 * Called only after audit_ipc_obj().
b0dd25a8 2184 */
2570ebbd 2185void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
1da177e4 2186{
1da177e4
LT
2187 struct audit_context *context = current->audit_context;
2188
e816f370
AV
2189 context->ipc.qbytes = qbytes;
2190 context->ipc.perm_uid = uid;
2191 context->ipc.perm_gid = gid;
2192 context->ipc.perm_mode = mode;
2193 context->ipc.has_perm = 1;
1da177e4 2194}
c2f0c7c3 2195
d9cfea91 2196void __audit_bprm(struct linux_binprm *bprm)
473ae30b 2197{
473ae30b 2198 struct audit_context *context = current->audit_context;
473ae30b 2199
d9cfea91
RGB
2200 context->type = AUDIT_EXECVE;
2201 context->execve.argc = bprm->argc;
473ae30b
AV
2202}
2203
2204
b0dd25a8 2205/**
196a5085 2206 * __audit_socketcall - record audit data for sys_socketcall
2950fa9d 2207 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
b0dd25a8
RD
2208 * @args: args array
2209 *
b0dd25a8 2210 */
2950fa9d 2211int __audit_socketcall(int nargs, unsigned long *args)
3ec3b2fb 2212{
3ec3b2fb
DW
2213 struct audit_context *context = current->audit_context;
2214
2950fa9d
CG
2215 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2216 return -EINVAL;
f3298dc4
AV
2217 context->type = AUDIT_SOCKETCALL;
2218 context->socketcall.nargs = nargs;
2219 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2950fa9d 2220 return 0;
3ec3b2fb
DW
2221}
2222
db349509
AV
2223/**
2224 * __audit_fd_pair - record audit data for pipe and socketpair
2225 * @fd1: the first file descriptor
2226 * @fd2: the second file descriptor
2227 *
db349509 2228 */
157cf649 2229void __audit_fd_pair(int fd1, int fd2)
db349509
AV
2230{
2231 struct audit_context *context = current->audit_context;
157cf649
AV
2232 context->fds[0] = fd1;
2233 context->fds[1] = fd2;
db349509
AV
2234}
2235
b0dd25a8 2236/**
196a5085 2237 * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
b0dd25a8
RD
2238 * @len: data length in user space
2239 * @a: data address in kernel space
2240 *
2241 * Returns 0 for success or NULL context or < 0 on error.
2242 */
07c49417 2243int __audit_sockaddr(int len, void *a)
3ec3b2fb 2244{
3ec3b2fb
DW
2245 struct audit_context *context = current->audit_context;
2246
4f6b434f
AV
2247 if (!context->sockaddr) {
2248 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2249 if (!p)
2250 return -ENOMEM;
2251 context->sockaddr = p;
2252 }
3ec3b2fb 2253
4f6b434f
AV
2254 context->sockaddr_len = len;
2255 memcpy(context->sockaddr, a, len);
3ec3b2fb
DW
2256 return 0;
2257}
2258
a5cb013d
AV
2259void __audit_ptrace(struct task_struct *t)
2260{
2261 struct audit_context *context = current->audit_context;
2262
fa2bea2f 2263 context->target_pid = task_tgid_nr(t);
c2a7780e 2264 context->target_auid = audit_get_loginuid(t);
c69e8d9c 2265 context->target_uid = task_uid(t);
4746ec5b 2266 context->target_sessionid = audit_get_sessionid(t);
2a862b32 2267 security_task_getsecid(t, &context->target_sid);
c2a7780e 2268 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
a5cb013d
AV
2269}
2270
b0dd25a8
RD
2271/**
2272 * audit_signal_info - record signal info for shutting down audit subsystem
2273 * @sig: signal value
2274 * @t: task being signaled
2275 *
2276 * If the audit subsystem is being terminated, record the task (pid)
2277 * and uid that is doing that.
2278 */
ab6434a1 2279int audit_signal_info(int sig, struct task_struct *t)
c2f0c7c3 2280{
e54dc243
AG
2281 struct audit_aux_data_pids *axp;
2282 struct task_struct *tsk = current;
2283 struct audit_context *ctx = tsk->audit_context;
cca080d9 2284 kuid_t uid = current_uid(), t_uid = task_uid(t);
e1396065 2285
ab6434a1
PM
2286 if (auditd_test_task(t) &&
2287 (sig == SIGTERM || sig == SIGHUP ||
2288 sig == SIGUSR1 || sig == SIGUSR2)) {
2289 audit_sig_pid = task_tgid_nr(tsk);
2290 if (uid_valid(tsk->loginuid))
2291 audit_sig_uid = tsk->loginuid;
2292 else
2293 audit_sig_uid = uid;
2294 security_task_getsecid(tsk, &audit_sig_sid);
c2f0c7c3 2295 }
e54dc243 2296
ab6434a1
PM
2297 if (!audit_signals || audit_dummy_context())
2298 return 0;
2299
e54dc243
AG
2300 /* optimize the common case by putting first signal recipient directly
2301 * in audit_context */
2302 if (!ctx->target_pid) {
f1dc4867 2303 ctx->target_pid = task_tgid_nr(t);
c2a7780e 2304 ctx->target_auid = audit_get_loginuid(t);
c69e8d9c 2305 ctx->target_uid = t_uid;
4746ec5b 2306 ctx->target_sessionid = audit_get_sessionid(t);
2a862b32 2307 security_task_getsecid(t, &ctx->target_sid);
c2a7780e 2308 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
e54dc243
AG
2309 return 0;
2310 }
2311
2312 axp = (void *)ctx->aux_pids;
2313 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2314 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2315 if (!axp)
2316 return -ENOMEM;
2317
2318 axp->d.type = AUDIT_OBJ_PID;
2319 axp->d.next = ctx->aux_pids;
2320 ctx->aux_pids = (void *)axp;
2321 }
88ae704c 2322 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
e54dc243 2323
f1dc4867 2324 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
c2a7780e 2325 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
c69e8d9c 2326 axp->target_uid[axp->pid_count] = t_uid;
4746ec5b 2327 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2a862b32 2328 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
c2a7780e 2329 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
e54dc243
AG
2330 axp->pid_count++;
2331
2332 return 0;
c2f0c7c3 2333}
0a4ff8c2 2334
3fc689e9
EP
2335/**
2336 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
d84f4f99
DH
2337 * @bprm: pointer to the bprm being processed
2338 * @new: the proposed new credentials
2339 * @old: the old credentials
3fc689e9
EP
2340 *
2341 * Simply check if the proc already has the caps given by the file and if not
2342 * store the priv escalation info for later auditing at the end of the syscall
2343 *
3fc689e9
EP
2344 * -Eric
2345 */
d84f4f99
DH
2346int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2347 const struct cred *new, const struct cred *old)
3fc689e9
EP
2348{
2349 struct audit_aux_data_bprm_fcaps *ax;
2350 struct audit_context *context = current->audit_context;
2351 struct cpu_vfs_cap_data vcaps;
3fc689e9
EP
2352
2353 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2354 if (!ax)
d84f4f99 2355 return -ENOMEM;
3fc689e9
EP
2356
2357 ax->d.type = AUDIT_BPRM_FCAPS;
2358 ax->d.next = context->aux;
2359 context->aux = (void *)ax;
2360
f4a4a8b1 2361 get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
3fc689e9
EP
2362
2363 ax->fcap.permitted = vcaps.permitted;
2364 ax->fcap.inheritable = vcaps.inheritable;
2365 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2366 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2367
d84f4f99
DH
2368 ax->old_pcap.permitted = old->cap_permitted;
2369 ax->old_pcap.inheritable = old->cap_inheritable;
2370 ax->old_pcap.effective = old->cap_effective;
7786f6b6 2371 ax->old_pcap.ambient = old->cap_ambient;
3fc689e9 2372
d84f4f99
DH
2373 ax->new_pcap.permitted = new->cap_permitted;
2374 ax->new_pcap.inheritable = new->cap_inheritable;
2375 ax->new_pcap.effective = new->cap_effective;
7786f6b6 2376 ax->new_pcap.ambient = new->cap_ambient;
d84f4f99 2377 return 0;
3fc689e9
EP
2378}
2379
e68b75a0
EP
2380/**
2381 * __audit_log_capset - store information about the arguments to the capset syscall
d84f4f99
DH
2382 * @new: the new credentials
2383 * @old: the old (current) credentials
e68b75a0 2384 *
da3dae54 2385 * Record the arguments userspace sent to sys_capset for later printing by the
e68b75a0
EP
2386 * audit system if applicable
2387 */
ca24a23e 2388void __audit_log_capset(const struct cred *new, const struct cred *old)
e68b75a0 2389{
e68b75a0 2390 struct audit_context *context = current->audit_context;
fa2bea2f 2391 context->capset.pid = task_tgid_nr(current);
57f71a0a
AV
2392 context->capset.cap.effective = new->cap_effective;
2393 context->capset.cap.inheritable = new->cap_effective;
2394 context->capset.cap.permitted = new->cap_permitted;
7786f6b6 2395 context->capset.cap.ambient = new->cap_ambient;
57f71a0a 2396 context->type = AUDIT_CAPSET;
e68b75a0
EP
2397}
2398
120a795d
AV
2399void __audit_mmap_fd(int fd, int flags)
2400{
2401 struct audit_context *context = current->audit_context;
2402 context->mmap.fd = fd;
2403 context->mmap.flags = flags;
2404 context->type = AUDIT_MMAP;
2405}
2406
ca86cad7
RGB
2407void __audit_log_kern_module(char *name)
2408{
2409 struct audit_context *context = current->audit_context;
2410
2411 context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
2412 strcpy(context->module.name, name);
2413 context->type = AUDIT_KERN_MODULE;
2414}
2415
de8cd83e
SG
2416void __audit_fanotify(unsigned int response)
2417{
2418 audit_log(current->audit_context, GFP_KERNEL,
2419 AUDIT_FANOTIFY, "resp=%u", response);
2420}
2421
7b9205bd 2422static void audit_log_task(struct audit_buffer *ab)
85e7bac3 2423{
cca080d9
EB
2424 kuid_t auid, uid;
2425 kgid_t gid;
85e7bac3 2426 unsigned int sessionid;
9eab339b 2427 char comm[sizeof(current->comm)];
85e7bac3
EP
2428
2429 auid = audit_get_loginuid(current);
2430 sessionid = audit_get_sessionid(current);
2431 current_uid_gid(&uid, &gid);
2432
2433 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
cca080d9
EB
2434 from_kuid(&init_user_ns, auid),
2435 from_kuid(&init_user_ns, uid),
2436 from_kgid(&init_user_ns, gid),
2437 sessionid);
85e7bac3 2438 audit_log_task_context(ab);
fa2bea2f 2439 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
9eab339b 2440 audit_log_untrustedstring(ab, get_task_comm(comm, current));
4766b199 2441 audit_log_d_path_exe(ab, current->mm);
7b9205bd
KC
2442}
2443
0a4ff8c2
SG
2444/**
2445 * audit_core_dumps - record information about processes that end abnormally
6d9525b5 2446 * @signr: signal value
0a4ff8c2
SG
2447 *
2448 * If a process ends with a core dump, something fishy is going on and we
2449 * should record the event for investigation.
2450 */
2451void audit_core_dumps(long signr)
2452{
2453 struct audit_buffer *ab;
0a4ff8c2
SG
2454
2455 if (!audit_enabled)
2456 return;
2457
2458 if (signr == SIGQUIT) /* don't care for those */
2459 return;
2460
2461 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
0644ec0c
KC
2462 if (unlikely(!ab))
2463 return;
61c0ee87 2464 audit_log_task(ab);
89670aff 2465 audit_log_format(ab, " sig=%ld res=1", signr);
85e7bac3
EP
2466 audit_log_end(ab);
2467}
0a4ff8c2 2468
3dc1c1b2 2469void __audit_seccomp(unsigned long syscall, long signr, int code)
85e7bac3
EP
2470{
2471 struct audit_buffer *ab;
2472
7b9205bd
KC
2473 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
2474 if (unlikely(!ab))
2475 return;
2476 audit_log_task(ab);
84db564a 2477 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
efbc0fbf
AL
2478 signr, syscall_get_arch(), syscall,
2479 in_compat_syscall(), KSTK_EIP(current), code);
0a4ff8c2
SG
2480 audit_log_end(ab);
2481}
916d7576
AV
2482
2483struct list_head *audit_killed_trees(void)
2484{
2485 struct audit_context *ctx = current->audit_context;
2486 if (likely(!ctx || !ctx->in_syscall))
2487 return NULL;
2488 return &ctx->killed_trees;
2489}