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1/* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright (C) 2005, 2006 IBM Corporation
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 *
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
33 * 2006.
34 *
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
37 *
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
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.
43 */
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
47#include <linux/init.h>
48#include <asm/types.h>
49#include <linux/atomic.h>
50#include <linux/fs.h>
51#include <linux/namei.h>
52#include <linux/mm.h>
53#include <linux/export.h>
54#include <linux/slab.h>
55#include <linux/mount.h>
56#include <linux/socket.h>
57#include <linux/mqueue.h>
58#include <linux/audit.h>
59#include <linux/personality.h>
60#include <linux/time.h>
61#include <linux/netlink.h>
62#include <linux/compiler.h>
63#include <asm/unistd.h>
64#include <linux/security.h>
65#include <linux/list.h>
66#include <linux/binfmts.h>
67#include <linux/highmem.h>
68#include <linux/syscalls.h>
69#include <asm/syscall.h>
70#include <linux/capability.h>
71#include <linux/fs_struct.h>
72#include <linux/compat.h>
73#include <linux/ctype.h>
74#include <linux/string.h>
75#include <linux/uaccess.h>
76#include <linux/fsnotify_backend.h>
77#include <uapi/linux/limits.h>
78
79#include "audit.h"
80
81/* flags stating the success for a syscall */
82#define AUDITSC_INVALID 0
83#define AUDITSC_SUCCESS 1
84#define AUDITSC_FAILURE 2
85
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 */
88#define MAX_EXECVE_AUDIT_LEN 7500
89
90/* max length to print of cmdline/proctitle value during audit */
91#define MAX_PROCTITLE_AUDIT_LEN 128
92
93/* number of audit rules */
94int audit_n_rules;
95
96/* determines whether we collect data for signals sent */
97int audit_signals;
98
99struct audit_aux_data {
100 struct audit_aux_data *next;
101 int type;
102};
103
104#define AUDIT_AUX_IPCPERM 0
105
106/* Number of target pids per aux struct. */
107#define AUDIT_AUX_PIDS 16
108
109struct audit_aux_data_pids {
110 struct audit_aux_data d;
111 pid_t target_pid[AUDIT_AUX_PIDS];
112 kuid_t target_auid[AUDIT_AUX_PIDS];
113 kuid_t target_uid[AUDIT_AUX_PIDS];
114 unsigned int target_sessionid[AUDIT_AUX_PIDS];
115 u32 target_sid[AUDIT_AUX_PIDS];
116 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
117 int pid_count;
118};
119
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
128struct audit_tree_refs {
129 struct audit_tree_refs *next;
130 struct audit_chunk *c[31];
131};
132
133static int audit_match_perm(struct audit_context *ctx, int mask)
134{
135 unsigned n;
136 if (unlikely(!ctx))
137 return 0;
138 n = ctx->major;
139
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
176static int audit_match_filetype(struct audit_context *ctx, int val)
177{
178 struct audit_names *n;
179 umode_t mode = (umode_t)val;
180
181 if (unlikely(!ctx))
182 return 0;
183
184 list_for_each_entry(n, &ctx->names_list, list) {
185 if ((n->ino != AUDIT_INO_UNSET) &&
186 ((n->mode & S_IFMT) == mode))
187 return 1;
188 }
189
190 return 0;
191}
192
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
203static void audit_set_auditable(struct audit_context *ctx)
204{
205 if (!ctx->prio) {
206 ctx->prio = 1;
207 ctx->current_state = AUDIT_RECORD_CONTEXT;
208 }
209}
210
211static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
212{
213 struct audit_tree_refs *p = ctx->trees;
214 int left = ctx->tree_count;
215 if (likely(left)) {
216 p->c[--left] = chunk;
217 ctx->tree_count = left;
218 return 1;
219 }
220 if (!p)
221 return 0;
222 p = p->next;
223 if (p) {
224 p->c[30] = chunk;
225 ctx->trees = p;
226 ctx->tree_count = 30;
227 return 1;
228 }
229 return 0;
230}
231
232static int grow_tree_refs(struct audit_context *ctx)
233{
234 struct audit_tree_refs *p = ctx->trees;
235 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
236 if (!ctx->trees) {
237 ctx->trees = p;
238 return 0;
239 }
240 if (p)
241 p->next = ctx->trees;
242 else
243 ctx->first_trees = ctx->trees;
244 ctx->tree_count = 31;
245 return 1;
246}
247
248static void unroll_tree_refs(struct audit_context *ctx,
249 struct audit_tree_refs *p, int count)
250{
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}
275
276static void free_tree_refs(struct audit_context *ctx)
277{
278 struct audit_tree_refs *p, *q;
279 for (p = ctx->first_trees; p; p = q) {
280 q = p->next;
281 kfree(p);
282 }
283}
284
285static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
286{
287 struct audit_tree_refs *p;
288 int n;
289 if (!tree)
290 return 0;
291 /* full ones */
292 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
293 for (n = 0; n < 31; n++)
294 if (audit_tree_match(p->c[n], tree))
295 return 1;
296 }
297 /* partial */
298 if (p) {
299 for (n = ctx->tree_count; n < 31; n++)
300 if (audit_tree_match(p->c[n], tree))
301 return 1;
302 }
303 return 0;
304}
305
306static int audit_compare_uid(kuid_t uid,
307 struct audit_names *name,
308 struct audit_field *f,
309 struct audit_context *ctx)
310{
311 struct audit_names *n;
312 int rc;
313
314 if (name) {
315 rc = audit_uid_comparator(uid, f->op, name->uid);
316 if (rc)
317 return rc;
318 }
319
320 if (ctx) {
321 list_for_each_entry(n, &ctx->names_list, list) {
322 rc = audit_uid_comparator(uid, f->op, n->uid);
323 if (rc)
324 return rc;
325 }
326 }
327 return 0;
328}
329
330static int audit_compare_gid(kgid_t gid,
331 struct audit_names *name,
332 struct audit_field *f,
333 struct audit_context *ctx)
334{
335 struct audit_names *n;
336 int rc;
337
338 if (name) {
339 rc = audit_gid_comparator(gid, f->op, name->gid);
340 if (rc)
341 return rc;
342 }
343
344 if (ctx) {
345 list_for_each_entry(n, &ctx->names_list, list) {
346 rc = audit_gid_comparator(gid, f->op, n->gid);
347 if (rc)
348 return rc;
349 }
350 }
351 return 0;
352}
353
354static int audit_field_compare(struct task_struct *tsk,
355 const struct cred *cred,
356 struct audit_field *f,
357 struct audit_context *ctx,
358 struct audit_names *name)
359{
360 switch (f->val) {
361 /* process to file object comparisons */
362 case AUDIT_COMPARE_UID_TO_OBJ_UID:
363 return audit_compare_uid(cred->uid, name, f, ctx);
364 case AUDIT_COMPARE_GID_TO_OBJ_GID:
365 return audit_compare_gid(cred->gid, name, f, ctx);
366 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
367 return audit_compare_uid(cred->euid, name, f, ctx);
368 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
369 return audit_compare_gid(cred->egid, name, f, ctx);
370 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
371 return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx);
372 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
373 return audit_compare_uid(cred->suid, name, f, ctx);
374 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
375 return audit_compare_gid(cred->sgid, name, f, ctx);
376 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
377 return audit_compare_uid(cred->fsuid, name, f, ctx);
378 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
379 return audit_compare_gid(cred->fsgid, name, f, ctx);
380 /* uid comparisons */
381 case AUDIT_COMPARE_UID_TO_AUID:
382 return audit_uid_comparator(cred->uid, f->op,
383 audit_get_loginuid(tsk));
384 case AUDIT_COMPARE_UID_TO_EUID:
385 return audit_uid_comparator(cred->uid, f->op, cred->euid);
386 case AUDIT_COMPARE_UID_TO_SUID:
387 return audit_uid_comparator(cred->uid, f->op, cred->suid);
388 case AUDIT_COMPARE_UID_TO_FSUID:
389 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
390 /* auid comparisons */
391 case AUDIT_COMPARE_AUID_TO_EUID:
392 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
393 cred->euid);
394 case AUDIT_COMPARE_AUID_TO_SUID:
395 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
396 cred->suid);
397 case AUDIT_COMPARE_AUID_TO_FSUID:
398 return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
399 cred->fsuid);
400 /* euid comparisons */
401 case AUDIT_COMPARE_EUID_TO_SUID:
402 return audit_uid_comparator(cred->euid, f->op, cred->suid);
403 case AUDIT_COMPARE_EUID_TO_FSUID:
404 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
405 /* suid comparisons */
406 case AUDIT_COMPARE_SUID_TO_FSUID:
407 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
408 /* gid comparisons */
409 case AUDIT_COMPARE_GID_TO_EGID:
410 return audit_gid_comparator(cred->gid, f->op, cred->egid);
411 case AUDIT_COMPARE_GID_TO_SGID:
412 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
413 case AUDIT_COMPARE_GID_TO_FSGID:
414 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
415 /* egid comparisons */
416 case AUDIT_COMPARE_EGID_TO_SGID:
417 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
418 case AUDIT_COMPARE_EGID_TO_FSGID:
419 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
420 /* sgid comparison */
421 case AUDIT_COMPARE_SGID_TO_FSGID:
422 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
423 default:
424 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
425 return 0;
426 }
427 return 0;
428}
429
430/* Determine if any context name data matches a rule's watch data */
431/* Compare a task_struct with an audit_rule. Return 1 on match, 0
432 * otherwise.
433 *
434 * If task_creation is true, this is an explicit indication that we are
435 * filtering a task rule at task creation time. This and tsk == current are
436 * the only situations where tsk->cred may be accessed without an rcu read lock.
437 */
438static int audit_filter_rules(struct task_struct *tsk,
439 struct audit_krule *rule,
440 struct audit_context *ctx,
441 struct audit_names *name,
442 enum audit_state *state,
443 bool task_creation)
444{
445 const struct cred *cred;
446 int i, need_sid = 1;
447 u32 sid;
448 unsigned int sessionid;
449
450 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
451
452 for (i = 0; i < rule->field_count; i++) {
453 struct audit_field *f = &rule->fields[i];
454 struct audit_names *n;
455 int result = 0;
456 pid_t pid;
457
458 switch (f->type) {
459 case AUDIT_PID:
460 pid = task_tgid_nr(tsk);
461 result = audit_comparator(pid, f->op, f->val);
462 break;
463 case AUDIT_PPID:
464 if (ctx) {
465 if (!ctx->ppid)
466 ctx->ppid = task_ppid_nr(tsk);
467 result = audit_comparator(ctx->ppid, f->op, f->val);
468 }
469 break;
470 case AUDIT_EXE:
471 result = audit_exe_compare(tsk, rule->exe);
472 if (f->op == Audit_not_equal)
473 result = !result;
474 break;
475 case AUDIT_UID:
476 result = audit_uid_comparator(cred->uid, f->op, f->uid);
477 break;
478 case AUDIT_EUID:
479 result = audit_uid_comparator(cred->euid, f->op, f->uid);
480 break;
481 case AUDIT_SUID:
482 result = audit_uid_comparator(cred->suid, f->op, f->uid);
483 break;
484 case AUDIT_FSUID:
485 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
486 break;
487 case AUDIT_GID:
488 result = audit_gid_comparator(cred->gid, f->op, f->gid);
489 if (f->op == Audit_equal) {
490 if (!result)
491 result = groups_search(cred->group_info, f->gid);
492 } else if (f->op == Audit_not_equal) {
493 if (result)
494 result = !groups_search(cred->group_info, f->gid);
495 }
496 break;
497 case AUDIT_EGID:
498 result = audit_gid_comparator(cred->egid, f->op, f->gid);
499 if (f->op == Audit_equal) {
500 if (!result)
501 result = groups_search(cred->group_info, f->gid);
502 } else if (f->op == Audit_not_equal) {
503 if (result)
504 result = !groups_search(cred->group_info, f->gid);
505 }
506 break;
507 case AUDIT_SGID:
508 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
509 break;
510 case AUDIT_FSGID:
511 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
512 break;
513 case AUDIT_SESSIONID:
514 sessionid = audit_get_sessionid(tsk);
515 result = audit_comparator(sessionid, f->op, f->val);
516 break;
517 case AUDIT_PERS:
518 result = audit_comparator(tsk->personality, f->op, f->val);
519 break;
520 case AUDIT_ARCH:
521 if (ctx)
522 result = audit_comparator(ctx->arch, f->op, f->val);
523 break;
524
525 case AUDIT_EXIT:
526 if (ctx && ctx->return_valid)
527 result = audit_comparator(ctx->return_code, f->op, f->val);
528 break;
529 case AUDIT_SUCCESS:
530 if (ctx && ctx->return_valid) {
531 if (f->val)
532 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
533 else
534 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
535 }
536 break;
537 case AUDIT_DEVMAJOR:
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) {
543 list_for_each_entry(n, &ctx->names_list, list) {
544 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
545 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
546 ++result;
547 break;
548 }
549 }
550 }
551 break;
552 case AUDIT_DEVMINOR:
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) {
558 list_for_each_entry(n, &ctx->names_list, list) {
559 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
560 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
561 ++result;
562 break;
563 }
564 }
565 }
566 break;
567 case AUDIT_INODE:
568 if (name)
569 result = audit_comparator(name->ino, f->op, f->val);
570 else if (ctx) {
571 list_for_each_entry(n, &ctx->names_list, list) {
572 if (audit_comparator(n->ino, f->op, f->val)) {
573 ++result;
574 break;
575 }
576 }
577 }
578 break;
579 case AUDIT_OBJ_UID:
580 if (name) {
581 result = audit_uid_comparator(name->uid, f->op, f->uid);
582 } else if (ctx) {
583 list_for_each_entry(n, &ctx->names_list, list) {
584 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
585 ++result;
586 break;
587 }
588 }
589 }
590 break;
591 case AUDIT_OBJ_GID:
592 if (name) {
593 result = audit_gid_comparator(name->gid, f->op, f->gid);
594 } else if (ctx) {
595 list_for_each_entry(n, &ctx->names_list, list) {
596 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
597 ++result;
598 break;
599 }
600 }
601 }
602 break;
603 case AUDIT_WATCH:
604 if (name) {
605 result = audit_watch_compare(rule->watch,
606 name->ino,
607 name->dev);
608 if (f->op == Audit_not_equal)
609 result = !result;
610 }
611 break;
612 case AUDIT_DIR:
613 if (ctx) {
614 result = match_tree_refs(ctx, rule->tree);
615 if (f->op == Audit_not_equal)
616 result = !result;
617 }
618 break;
619 case AUDIT_LOGINUID:
620 result = audit_uid_comparator(audit_get_loginuid(tsk),
621 f->op, f->uid);
622 break;
623 case AUDIT_LOGINUID_SET:
624 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
625 break;
626 case AUDIT_SADDR_FAM:
627 if (ctx->sockaddr)
628 result = audit_comparator(ctx->sockaddr->ss_family,
629 f->op, f->val);
630 break;
631 case AUDIT_SUBJ_USER:
632 case AUDIT_SUBJ_ROLE:
633 case AUDIT_SUBJ_TYPE:
634 case AUDIT_SUBJ_SEN:
635 case AUDIT_SUBJ_CLR:
636 /* NOTE: this may return negative values indicating
637 a temporary error. We simply treat this as a
638 match for now to avoid losing information that
639 may be wanted. An error message will also be
640 logged upon error */
641 if (f->lsm_rule) {
642 if (need_sid) {
643 security_task_getsecid(tsk, &sid);
644 need_sid = 0;
645 }
646 result = security_audit_rule_match(sid, f->type,
647 f->op,
648 f->lsm_rule);
649 }
650 break;
651 case AUDIT_OBJ_USER:
652 case AUDIT_OBJ_ROLE:
653 case AUDIT_OBJ_TYPE:
654 case AUDIT_OBJ_LEV_LOW:
655 case AUDIT_OBJ_LEV_HIGH:
656 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
657 also applies here */
658 if (f->lsm_rule) {
659 /* Find files that match */
660 if (name) {
661 result = security_audit_rule_match(
662 name->osid,
663 f->type,
664 f->op,
665 f->lsm_rule);
666 } else if (ctx) {
667 list_for_each_entry(n, &ctx->names_list, list) {
668 if (security_audit_rule_match(
669 n->osid,
670 f->type,
671 f->op,
672 f->lsm_rule)) {
673 ++result;
674 break;
675 }
676 }
677 }
678 /* Find ipc objects that match */
679 if (!ctx || ctx->type != AUDIT_IPC)
680 break;
681 if (security_audit_rule_match(ctx->ipc.osid,
682 f->type, f->op,
683 f->lsm_rule))
684 ++result;
685 }
686 break;
687 case AUDIT_ARG0:
688 case AUDIT_ARG1:
689 case AUDIT_ARG2:
690 case AUDIT_ARG3:
691 if (ctx)
692 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
693 break;
694 case AUDIT_FILTERKEY:
695 /* ignore this field for filtering */
696 result = 1;
697 break;
698 case AUDIT_PERM:
699 result = audit_match_perm(ctx, f->val);
700 if (f->op == Audit_not_equal)
701 result = !result;
702 break;
703 case AUDIT_FILETYPE:
704 result = audit_match_filetype(ctx, f->val);
705 if (f->op == Audit_not_equal)
706 result = !result;
707 break;
708 case AUDIT_FIELD_COMPARE:
709 result = audit_field_compare(tsk, cred, f, ctx, name);
710 break;
711 }
712 if (!result)
713 return 0;
714 }
715
716 if (ctx) {
717 if (rule->prio <= ctx->prio)
718 return 0;
719 if (rule->filterkey) {
720 kfree(ctx->filterkey);
721 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
722 }
723 ctx->prio = rule->prio;
724 }
725 switch (rule->action) {
726 case AUDIT_NEVER:
727 *state = AUDIT_DISABLED;
728 break;
729 case AUDIT_ALWAYS:
730 *state = AUDIT_RECORD_CONTEXT;
731 break;
732 }
733 return 1;
734}
735
736/* At process creation time, we can determine if system-call auditing is
737 * completely disabled for this task. Since we only have the task
738 * structure at this point, we can only check uid and gid.
739 */
740static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
741{
742 struct audit_entry *e;
743 enum audit_state state;
744
745 rcu_read_lock();
746 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
747 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
748 &state, true)) {
749 if (state == AUDIT_RECORD_CONTEXT)
750 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
751 rcu_read_unlock();
752 return state;
753 }
754 }
755 rcu_read_unlock();
756 return AUDIT_BUILD_CONTEXT;
757}
758
759static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
760{
761 int word, bit;
762
763 if (val > 0xffffffff)
764 return false;
765
766 word = AUDIT_WORD(val);
767 if (word >= AUDIT_BITMASK_SIZE)
768 return false;
769
770 bit = AUDIT_BIT(val);
771
772 return rule->mask[word] & bit;
773}
774
775/* At syscall entry and exit time, this filter is called if the
776 * audit_state is not low enough that auditing cannot take place, but is
777 * also not high enough that we already know we have to write an audit
778 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
779 */
780static enum audit_state audit_filter_syscall(struct task_struct *tsk,
781 struct audit_context *ctx,
782 struct list_head *list)
783{
784 struct audit_entry *e;
785 enum audit_state state;
786
787 if (auditd_test_task(tsk))
788 return AUDIT_DISABLED;
789
790 rcu_read_lock();
791 list_for_each_entry_rcu(e, list, list) {
792 if (audit_in_mask(&e->rule, ctx->major) &&
793 audit_filter_rules(tsk, &e->rule, ctx, NULL,
794 &state, false)) {
795 rcu_read_unlock();
796 ctx->current_state = state;
797 return state;
798 }
799 }
800 rcu_read_unlock();
801 return AUDIT_BUILD_CONTEXT;
802}
803
804/*
805 * Given an audit_name check the inode hash table to see if they match.
806 * Called holding the rcu read lock to protect the use of audit_inode_hash
807 */
808static int audit_filter_inode_name(struct task_struct *tsk,
809 struct audit_names *n,
810 struct audit_context *ctx) {
811 int h = audit_hash_ino((u32)n->ino);
812 struct list_head *list = &audit_inode_hash[h];
813 struct audit_entry *e;
814 enum audit_state state;
815
816 list_for_each_entry_rcu(e, list, list) {
817 if (audit_in_mask(&e->rule, ctx->major) &&
818 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
819 ctx->current_state = state;
820 return 1;
821 }
822 }
823 return 0;
824}
825
826/* At syscall exit time, this filter is called if any audit_names have been
827 * collected during syscall processing. We only check rules in sublists at hash
828 * buckets applicable to the inode numbers in audit_names.
829 * Regarding audit_state, same rules apply as for audit_filter_syscall().
830 */
831void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
832{
833 struct audit_names *n;
834
835 if (auditd_test_task(tsk))
836 return;
837
838 rcu_read_lock();
839
840 list_for_each_entry(n, &ctx->names_list, list) {
841 if (audit_filter_inode_name(tsk, n, ctx))
842 break;
843 }
844 rcu_read_unlock();
845}
846
847static inline void audit_proctitle_free(struct audit_context *context)
848{
849 kfree(context->proctitle.value);
850 context->proctitle.value = NULL;
851 context->proctitle.len = 0;
852}
853
854static inline void audit_free_module(struct audit_context *context)
855{
856 if (context->type == AUDIT_KERN_MODULE) {
857 kfree(context->module.name);
858 context->module.name = NULL;
859 }
860}
861static inline void audit_free_names(struct audit_context *context)
862{
863 struct audit_names *n, *next;
864
865 list_for_each_entry_safe(n, next, &context->names_list, list) {
866 list_del(&n->list);
867 if (n->name)
868 putname(n->name);
869 if (n->should_free)
870 kfree(n);
871 }
872 context->name_count = 0;
873 path_put(&context->pwd);
874 context->pwd.dentry = NULL;
875 context->pwd.mnt = NULL;
876}
877
878static inline void audit_free_aux(struct audit_context *context)
879{
880 struct audit_aux_data *aux;
881
882 while ((aux = context->aux)) {
883 context->aux = aux->next;
884 kfree(aux);
885 }
886 while ((aux = context->aux_pids)) {
887 context->aux_pids = aux->next;
888 kfree(aux);
889 }
890}
891
892static inline struct audit_context *audit_alloc_context(enum audit_state state)
893{
894 struct audit_context *context;
895
896 context = kzalloc(sizeof(*context), GFP_KERNEL);
897 if (!context)
898 return NULL;
899 context->state = state;
900 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
901 INIT_LIST_HEAD(&context->killed_trees);
902 INIT_LIST_HEAD(&context->names_list);
903 return context;
904}
905
906/**
907 * audit_alloc - allocate an audit context block for a task
908 * @tsk: task
909 *
910 * Filter on the task information and allocate a per-task audit context
911 * if necessary. Doing so turns on system call auditing for the
912 * specified task. This is called from copy_process, so no lock is
913 * needed.
914 */
915int audit_alloc(struct task_struct *tsk)
916{
917 struct audit_context *context;
918 enum audit_state state;
919 char *key = NULL;
920
921 if (likely(!audit_ever_enabled))
922 return 0; /* Return if not auditing. */
923
924 state = audit_filter_task(tsk, &key);
925 if (state == AUDIT_DISABLED) {
926 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
927 return 0;
928 }
929
930 if (!(context = audit_alloc_context(state))) {
931 kfree(key);
932 audit_log_lost("out of memory in audit_alloc");
933 return -ENOMEM;
934 }
935 context->filterkey = key;
936
937 audit_set_context(tsk, context);
938 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
939 return 0;
940}
941
942static inline void audit_free_context(struct audit_context *context)
943{
944 audit_free_module(context);
945 audit_free_names(context);
946 unroll_tree_refs(context, NULL, 0);
947 free_tree_refs(context);
948 audit_free_aux(context);
949 kfree(context->filterkey);
950 kfree(context->sockaddr);
951 audit_proctitle_free(context);
952 kfree(context);
953}
954
955static int audit_log_pid_context(struct audit_context *context, pid_t pid,
956 kuid_t auid, kuid_t uid, unsigned int sessionid,
957 u32 sid, char *comm)
958{
959 struct audit_buffer *ab;
960 char *ctx = NULL;
961 u32 len;
962 int rc = 0;
963
964 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
965 if (!ab)
966 return rc;
967
968 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
969 from_kuid(&init_user_ns, auid),
970 from_kuid(&init_user_ns, uid), sessionid);
971 if (sid) {
972 if (security_secid_to_secctx(sid, &ctx, &len)) {
973 audit_log_format(ab, " obj=(none)");
974 rc = 1;
975 } else {
976 audit_log_format(ab, " obj=%s", ctx);
977 security_release_secctx(ctx, len);
978 }
979 }
980 audit_log_format(ab, " ocomm=");
981 audit_log_untrustedstring(ab, comm);
982 audit_log_end(ab);
983
984 return rc;
985}
986
987static void audit_log_execve_info(struct audit_context *context,
988 struct audit_buffer **ab)
989{
990 long len_max;
991 long len_rem;
992 long len_full;
993 long len_buf;
994 long len_abuf = 0;
995 long len_tmp;
996 bool require_data;
997 bool encode;
998 unsigned int iter;
999 unsigned int arg;
1000 char *buf_head;
1001 char *buf;
1002 const char __user *p = (const char __user *)current->mm->arg_start;
1003
1004 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1005 * data we put in the audit record for this argument (see the
1006 * code below) ... at this point in time 96 is plenty */
1007 char abuf[96];
1008
1009 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1010 * current value of 7500 is not as important as the fact that it
1011 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1012 * room if we go over a little bit in the logging below */
1013 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1014 len_max = MAX_EXECVE_AUDIT_LEN;
1015
1016 /* scratch buffer to hold the userspace args */
1017 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1018 if (!buf_head) {
1019 audit_panic("out of memory for argv string");
1020 return;
1021 }
1022 buf = buf_head;
1023
1024 audit_log_format(*ab, "argc=%d", context->execve.argc);
1025
1026 len_rem = len_max;
1027 len_buf = 0;
1028 len_full = 0;
1029 require_data = true;
1030 encode = false;
1031 iter = 0;
1032 arg = 0;
1033 do {
1034 /* NOTE: we don't ever want to trust this value for anything
1035 * serious, but the audit record format insists we
1036 * provide an argument length for really long arguments,
1037 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1038 * to use strncpy_from_user() to obtain this value for
1039 * recording in the log, although we don't use it
1040 * anywhere here to avoid a double-fetch problem */
1041 if (len_full == 0)
1042 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1043
1044 /* read more data from userspace */
1045 if (require_data) {
1046 /* can we make more room in the buffer? */
1047 if (buf != buf_head) {
1048 memmove(buf_head, buf, len_buf);
1049 buf = buf_head;
1050 }
1051
1052 /* fetch as much as we can of the argument */
1053 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1054 len_max - len_buf);
1055 if (len_tmp == -EFAULT) {
1056 /* unable to copy from userspace */
1057 send_sig(SIGKILL, current, 0);
1058 goto out;
1059 } else if (len_tmp == (len_max - len_buf)) {
1060 /* buffer is not large enough */
1061 require_data = true;
1062 /* NOTE: if we are going to span multiple
1063 * buffers force the encoding so we stand
1064 * a chance at a sane len_full value and
1065 * consistent record encoding */
1066 encode = true;
1067 len_full = len_full * 2;
1068 p += len_tmp;
1069 } else {
1070 require_data = false;
1071 if (!encode)
1072 encode = audit_string_contains_control(
1073 buf, len_tmp);
1074 /* try to use a trusted value for len_full */
1075 if (len_full < len_max)
1076 len_full = (encode ?
1077 len_tmp * 2 : len_tmp);
1078 p += len_tmp + 1;
1079 }
1080 len_buf += len_tmp;
1081 buf_head[len_buf] = '\0';
1082
1083 /* length of the buffer in the audit record? */
1084 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
1085 }
1086
1087 /* write as much as we can to the audit log */
1088 if (len_buf >= 0) {
1089 /* NOTE: some magic numbers here - basically if we
1090 * can't fit a reasonable amount of data into the
1091 * existing audit buffer, flush it and start with
1092 * a new buffer */
1093 if ((sizeof(abuf) + 8) > len_rem) {
1094 len_rem = len_max;
1095 audit_log_end(*ab);
1096 *ab = audit_log_start(context,
1097 GFP_KERNEL, AUDIT_EXECVE);
1098 if (!*ab)
1099 goto out;
1100 }
1101
1102 /* create the non-arg portion of the arg record */
1103 len_tmp = 0;
1104 if (require_data || (iter > 0) ||
1105 ((len_abuf + sizeof(abuf)) > len_rem)) {
1106 if (iter == 0) {
1107 len_tmp += snprintf(&abuf[len_tmp],
1108 sizeof(abuf) - len_tmp,
1109 " a%d_len=%lu",
1110 arg, len_full);
1111 }
1112 len_tmp += snprintf(&abuf[len_tmp],
1113 sizeof(abuf) - len_tmp,
1114 " a%d[%d]=", arg, iter++);
1115 } else
1116 len_tmp += snprintf(&abuf[len_tmp],
1117 sizeof(abuf) - len_tmp,
1118 " a%d=", arg);
1119 WARN_ON(len_tmp >= sizeof(abuf));
1120 abuf[sizeof(abuf) - 1] = '\0';
1121
1122 /* log the arg in the audit record */
1123 audit_log_format(*ab, "%s", abuf);
1124 len_rem -= len_tmp;
1125 len_tmp = len_buf;
1126 if (encode) {
1127 if (len_abuf > len_rem)
1128 len_tmp = len_rem / 2; /* encoding */
1129 audit_log_n_hex(*ab, buf, len_tmp);
1130 len_rem -= len_tmp * 2;
1131 len_abuf -= len_tmp * 2;
1132 } else {
1133 if (len_abuf > len_rem)
1134 len_tmp = len_rem - 2; /* quotes */
1135 audit_log_n_string(*ab, buf, len_tmp);
1136 len_rem -= len_tmp + 2;
1137 /* don't subtract the "2" because we still need
1138 * to add quotes to the remaining string */
1139 len_abuf -= len_tmp;
1140 }
1141 len_buf -= len_tmp;
1142 buf += len_tmp;
1143 }
1144
1145 /* ready to move to the next argument? */
1146 if ((len_buf == 0) && !require_data) {
1147 arg++;
1148 iter = 0;
1149 len_full = 0;
1150 require_data = true;
1151 encode = false;
1152 }
1153 } while (arg < context->execve.argc);
1154
1155 /* NOTE: the caller handles the final audit_log_end() call */
1156
1157out:
1158 kfree(buf_head);
1159}
1160
1161static void audit_log_cap(struct audit_buffer *ab, char *prefix,
1162 kernel_cap_t *cap)
1163{
1164 int i;
1165
1166 if (cap_isclear(*cap)) {
1167 audit_log_format(ab, " %s=0", prefix);
1168 return;
1169 }
1170 audit_log_format(ab, " %s=", prefix);
1171 CAP_FOR_EACH_U32(i)
1172 audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]);
1173}
1174
1175static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1176{
1177 if (name->fcap_ver == -1) {
1178 audit_log_format(ab, " cap_fe=? cap_fver=? cap_fp=? cap_fi=?");
1179 return;
1180 }
1181 audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
1182 audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
1183 audit_log_format(ab, " cap_fe=%d cap_fver=%x cap_frootid=%d",
1184 name->fcap.fE, name->fcap_ver,
1185 from_kuid(&init_user_ns, name->fcap.rootid));
1186}
1187
1188static void show_special(struct audit_context *context, int *call_panic)
1189{
1190 struct audit_buffer *ab;
1191 int i;
1192
1193 ab = audit_log_start(context, GFP_KERNEL, context->type);
1194 if (!ab)
1195 return;
1196
1197 switch (context->type) {
1198 case AUDIT_SOCKETCALL: {
1199 int nargs = context->socketcall.nargs;
1200 audit_log_format(ab, "nargs=%d", nargs);
1201 for (i = 0; i < nargs; i++)
1202 audit_log_format(ab, " a%d=%lx", i,
1203 context->socketcall.args[i]);
1204 break; }
1205 case AUDIT_IPC: {
1206 u32 osid = context->ipc.osid;
1207
1208 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1209 from_kuid(&init_user_ns, context->ipc.uid),
1210 from_kgid(&init_user_ns, context->ipc.gid),
1211 context->ipc.mode);
1212 if (osid) {
1213 char *ctx = NULL;
1214 u32 len;
1215 if (security_secid_to_secctx(osid, &ctx, &len)) {
1216 audit_log_format(ab, " osid=%u", osid);
1217 *call_panic = 1;
1218 } else {
1219 audit_log_format(ab, " obj=%s", ctx);
1220 security_release_secctx(ctx, len);
1221 }
1222 }
1223 if (context->ipc.has_perm) {
1224 audit_log_end(ab);
1225 ab = audit_log_start(context, GFP_KERNEL,
1226 AUDIT_IPC_SET_PERM);
1227 if (unlikely(!ab))
1228 return;
1229 audit_log_format(ab,
1230 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1231 context->ipc.qbytes,
1232 context->ipc.perm_uid,
1233 context->ipc.perm_gid,
1234 context->ipc.perm_mode);
1235 }
1236 break; }
1237 case AUDIT_MQ_OPEN:
1238 audit_log_format(ab,
1239 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1240 "mq_msgsize=%ld mq_curmsgs=%ld",
1241 context->mq_open.oflag, context->mq_open.mode,
1242 context->mq_open.attr.mq_flags,
1243 context->mq_open.attr.mq_maxmsg,
1244 context->mq_open.attr.mq_msgsize,
1245 context->mq_open.attr.mq_curmsgs);
1246 break;
1247 case AUDIT_MQ_SENDRECV:
1248 audit_log_format(ab,
1249 "mqdes=%d msg_len=%zd msg_prio=%u "
1250 "abs_timeout_sec=%lld abs_timeout_nsec=%ld",
1251 context->mq_sendrecv.mqdes,
1252 context->mq_sendrecv.msg_len,
1253 context->mq_sendrecv.msg_prio,
1254 (long long) context->mq_sendrecv.abs_timeout.tv_sec,
1255 context->mq_sendrecv.abs_timeout.tv_nsec);
1256 break;
1257 case AUDIT_MQ_NOTIFY:
1258 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1259 context->mq_notify.mqdes,
1260 context->mq_notify.sigev_signo);
1261 break;
1262 case AUDIT_MQ_GETSETATTR: {
1263 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1264 audit_log_format(ab,
1265 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1266 "mq_curmsgs=%ld ",
1267 context->mq_getsetattr.mqdes,
1268 attr->mq_flags, attr->mq_maxmsg,
1269 attr->mq_msgsize, attr->mq_curmsgs);
1270 break; }
1271 case AUDIT_CAPSET:
1272 audit_log_format(ab, "pid=%d", context->capset.pid);
1273 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1274 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1275 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1276 audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
1277 break;
1278 case AUDIT_MMAP:
1279 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1280 context->mmap.flags);
1281 break;
1282 case AUDIT_EXECVE:
1283 audit_log_execve_info(context, &ab);
1284 break;
1285 case AUDIT_KERN_MODULE:
1286 audit_log_format(ab, "name=");
1287 if (context->module.name) {
1288 audit_log_untrustedstring(ab, context->module.name);
1289 } else
1290 audit_log_format(ab, "(null)");
1291
1292 break;
1293 }
1294 audit_log_end(ab);
1295}
1296
1297static inline int audit_proctitle_rtrim(char *proctitle, int len)
1298{
1299 char *end = proctitle + len - 1;
1300 while (end > proctitle && !isprint(*end))
1301 end--;
1302
1303 /* catch the case where proctitle is only 1 non-print character */
1304 len = end - proctitle + 1;
1305 len -= isprint(proctitle[len-1]) == 0;
1306 return len;
1307}
1308
1309/*
1310 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1311 * @context: audit_context for the task
1312 * @n: audit_names structure with reportable details
1313 * @path: optional path to report instead of audit_names->name
1314 * @record_num: record number to report when handling a list of names
1315 * @call_panic: optional pointer to int that will be updated if secid fails
1316 */
1317static void audit_log_name(struct audit_context *context, struct audit_names *n,
1318 const struct path *path, int record_num, int *call_panic)
1319{
1320 struct audit_buffer *ab;
1321
1322 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1323 if (!ab)
1324 return;
1325
1326 audit_log_format(ab, "item=%d", record_num);
1327
1328 if (path)
1329 audit_log_d_path(ab, " name=", path);
1330 else if (n->name) {
1331 switch (n->name_len) {
1332 case AUDIT_NAME_FULL:
1333 /* log the full path */
1334 audit_log_format(ab, " name=");
1335 audit_log_untrustedstring(ab, n->name->name);
1336 break;
1337 case 0:
1338 /* name was specified as a relative path and the
1339 * directory component is the cwd
1340 */
1341 audit_log_d_path(ab, " name=", &context->pwd);
1342 break;
1343 default:
1344 /* log the name's directory component */
1345 audit_log_format(ab, " name=");
1346 audit_log_n_untrustedstring(ab, n->name->name,
1347 n->name_len);
1348 }
1349 } else
1350 audit_log_format(ab, " name=(null)");
1351
1352 if (n->ino != AUDIT_INO_UNSET)
1353 audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#ho ouid=%u ogid=%u rdev=%02x:%02x",
1354 n->ino,
1355 MAJOR(n->dev),
1356 MINOR(n->dev),
1357 n->mode,
1358 from_kuid(&init_user_ns, n->uid),
1359 from_kgid(&init_user_ns, n->gid),
1360 MAJOR(n->rdev),
1361 MINOR(n->rdev));
1362 if (n->osid != 0) {
1363 char *ctx = NULL;
1364 u32 len;
1365
1366 if (security_secid_to_secctx(
1367 n->osid, &ctx, &len)) {
1368 audit_log_format(ab, " osid=%u", n->osid);
1369 if (call_panic)
1370 *call_panic = 2;
1371 } else {
1372 audit_log_format(ab, " obj=%s", ctx);
1373 security_release_secctx(ctx, len);
1374 }
1375 }
1376
1377 /* log the audit_names record type */
1378 switch (n->type) {
1379 case AUDIT_TYPE_NORMAL:
1380 audit_log_format(ab, " nametype=NORMAL");
1381 break;
1382 case AUDIT_TYPE_PARENT:
1383 audit_log_format(ab, " nametype=PARENT");
1384 break;
1385 case AUDIT_TYPE_CHILD_DELETE:
1386 audit_log_format(ab, " nametype=DELETE");
1387 break;
1388 case AUDIT_TYPE_CHILD_CREATE:
1389 audit_log_format(ab, " nametype=CREATE");
1390 break;
1391 default:
1392 audit_log_format(ab, " nametype=UNKNOWN");
1393 break;
1394 }
1395
1396 audit_log_fcaps(ab, n);
1397 audit_log_end(ab);
1398}
1399
1400static void audit_log_proctitle(void)
1401{
1402 int res;
1403 char *buf;
1404 char *msg = "(null)";
1405 int len = strlen(msg);
1406 struct audit_context *context = audit_context();
1407 struct audit_buffer *ab;
1408
1409 if (!context || context->dummy)
1410 return;
1411
1412 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1413 if (!ab)
1414 return; /* audit_panic or being filtered */
1415
1416 audit_log_format(ab, "proctitle=");
1417
1418 /* Not cached */
1419 if (!context->proctitle.value) {
1420 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1421 if (!buf)
1422 goto out;
1423 /* Historically called this from procfs naming */
1424 res = get_cmdline(current, buf, MAX_PROCTITLE_AUDIT_LEN);
1425 if (res == 0) {
1426 kfree(buf);
1427 goto out;
1428 }
1429 res = audit_proctitle_rtrim(buf, res);
1430 if (res == 0) {
1431 kfree(buf);
1432 goto out;
1433 }
1434 context->proctitle.value = buf;
1435 context->proctitle.len = res;
1436 }
1437 msg = context->proctitle.value;
1438 len = context->proctitle.len;
1439out:
1440 audit_log_n_untrustedstring(ab, msg, len);
1441 audit_log_end(ab);
1442}
1443
1444static void audit_log_exit(void)
1445{
1446 int i, call_panic = 0;
1447 struct audit_context *context = audit_context();
1448 struct audit_buffer *ab;
1449 struct audit_aux_data *aux;
1450 struct audit_names *n;
1451
1452 context->personality = current->personality;
1453
1454 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1455 if (!ab)
1456 return; /* audit_panic has been called */
1457 audit_log_format(ab, "arch=%x syscall=%d",
1458 context->arch, context->major);
1459 if (context->personality != PER_LINUX)
1460 audit_log_format(ab, " per=%lx", context->personality);
1461 if (context->return_valid)
1462 audit_log_format(ab, " success=%s exit=%ld",
1463 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1464 context->return_code);
1465
1466 audit_log_format(ab,
1467 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1468 context->argv[0],
1469 context->argv[1],
1470 context->argv[2],
1471 context->argv[3],
1472 context->name_count);
1473
1474 audit_log_task_info(ab);
1475 audit_log_key(ab, context->filterkey);
1476 audit_log_end(ab);
1477
1478 for (aux = context->aux; aux; aux = aux->next) {
1479
1480 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1481 if (!ab)
1482 continue; /* audit_panic has been called */
1483
1484 switch (aux->type) {
1485
1486 case AUDIT_BPRM_FCAPS: {
1487 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1488 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1489 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1490 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1491 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1492 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1493 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1494 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1495 audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
1496 audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
1497 audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
1498 audit_log_cap(ab, "pe", &axs->new_pcap.effective);
1499 audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
1500 audit_log_format(ab, " frootid=%d",
1501 from_kuid(&init_user_ns,
1502 axs->fcap.rootid));
1503 break; }
1504
1505 }
1506 audit_log_end(ab);
1507 }
1508
1509 if (context->type)
1510 show_special(context, &call_panic);
1511
1512 if (context->fds[0] >= 0) {
1513 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1514 if (ab) {
1515 audit_log_format(ab, "fd0=%d fd1=%d",
1516 context->fds[0], context->fds[1]);
1517 audit_log_end(ab);
1518 }
1519 }
1520
1521 if (context->sockaddr_len) {
1522 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1523 if (ab) {
1524 audit_log_format(ab, "saddr=");
1525 audit_log_n_hex(ab, (void *)context->sockaddr,
1526 context->sockaddr_len);
1527 audit_log_end(ab);
1528 }
1529 }
1530
1531 for (aux = context->aux_pids; aux; aux = aux->next) {
1532 struct audit_aux_data_pids *axs = (void *)aux;
1533
1534 for (i = 0; i < axs->pid_count; i++)
1535 if (audit_log_pid_context(context, axs->target_pid[i],
1536 axs->target_auid[i],
1537 axs->target_uid[i],
1538 axs->target_sessionid[i],
1539 axs->target_sid[i],
1540 axs->target_comm[i]))
1541 call_panic = 1;
1542 }
1543
1544 if (context->target_pid &&
1545 audit_log_pid_context(context, context->target_pid,
1546 context->target_auid, context->target_uid,
1547 context->target_sessionid,
1548 context->target_sid, context->target_comm))
1549 call_panic = 1;
1550
1551 if (context->pwd.dentry && context->pwd.mnt) {
1552 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1553 if (ab) {
1554 audit_log_d_path(ab, "cwd=", &context->pwd);
1555 audit_log_end(ab);
1556 }
1557 }
1558
1559 i = 0;
1560 list_for_each_entry(n, &context->names_list, list) {
1561 if (n->hidden)
1562 continue;
1563 audit_log_name(context, n, NULL, i++, &call_panic);
1564 }
1565
1566 audit_log_proctitle();
1567
1568 /* Send end of event record to help user space know we are finished */
1569 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1570 if (ab)
1571 audit_log_end(ab);
1572 if (call_panic)
1573 audit_panic("error converting sid to string");
1574}
1575
1576/**
1577 * __audit_free - free a per-task audit context
1578 * @tsk: task whose audit context block to free
1579 *
1580 * Called from copy_process and do_exit
1581 */
1582void __audit_free(struct task_struct *tsk)
1583{
1584 struct audit_context *context = tsk->audit_context;
1585
1586 if (!context)
1587 return;
1588
1589 if (!list_empty(&context->killed_trees))
1590 audit_kill_trees(context);
1591
1592 /* We are called either by do_exit() or the fork() error handling code;
1593 * in the former case tsk == current and in the latter tsk is a
1594 * random task_struct that doesn't doesn't have any meaningful data we
1595 * need to log via audit_log_exit().
1596 */
1597 if (tsk == current && !context->dummy && context->in_syscall) {
1598 context->return_valid = 0;
1599 context->return_code = 0;
1600
1601 audit_filter_syscall(tsk, context,
1602 &audit_filter_list[AUDIT_FILTER_EXIT]);
1603 audit_filter_inodes(tsk, context);
1604 if (context->current_state == AUDIT_RECORD_CONTEXT)
1605 audit_log_exit();
1606 }
1607
1608 audit_set_context(tsk, NULL);
1609 audit_free_context(context);
1610}
1611
1612/**
1613 * __audit_syscall_entry - fill in an audit record at syscall entry
1614 * @major: major syscall type (function)
1615 * @a1: additional syscall register 1
1616 * @a2: additional syscall register 2
1617 * @a3: additional syscall register 3
1618 * @a4: additional syscall register 4
1619 *
1620 * Fill in audit context at syscall entry. This only happens if the
1621 * audit context was created when the task was created and the state or
1622 * filters demand the audit context be built. If the state from the
1623 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1624 * then the record will be written at syscall exit time (otherwise, it
1625 * will only be written if another part of the kernel requests that it
1626 * be written).
1627 */
1628void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1629 unsigned long a3, unsigned long a4)
1630{
1631 struct audit_context *context = audit_context();
1632 enum audit_state state;
1633
1634 if (!audit_enabled || !context)
1635 return;
1636
1637 BUG_ON(context->in_syscall || context->name_count);
1638
1639 state = context->state;
1640 if (state == AUDIT_DISABLED)
1641 return;
1642
1643 context->dummy = !audit_n_rules;
1644 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1645 context->prio = 0;
1646 if (auditd_test_task(current))
1647 return;
1648 }
1649
1650 context->arch = syscall_get_arch(current);
1651 context->major = major;
1652 context->argv[0] = a1;
1653 context->argv[1] = a2;
1654 context->argv[2] = a3;
1655 context->argv[3] = a4;
1656 context->serial = 0;
1657 context->in_syscall = 1;
1658 context->current_state = state;
1659 context->ppid = 0;
1660 ktime_get_coarse_real_ts64(&context->ctime);
1661}
1662
1663/**
1664 * __audit_syscall_exit - deallocate audit context after a system call
1665 * @success: success value of the syscall
1666 * @return_code: return value of the syscall
1667 *
1668 * Tear down after system call. If the audit context has been marked as
1669 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1670 * filtering, or because some other part of the kernel wrote an audit
1671 * message), then write out the syscall information. In call cases,
1672 * free the names stored from getname().
1673 */
1674void __audit_syscall_exit(int success, long return_code)
1675{
1676 struct audit_context *context;
1677
1678 context = audit_context();
1679 if (!context)
1680 return;
1681
1682 if (!list_empty(&context->killed_trees))
1683 audit_kill_trees(context);
1684
1685 if (!context->dummy && context->in_syscall) {
1686 if (success)
1687 context->return_valid = AUDITSC_SUCCESS;
1688 else
1689 context->return_valid = AUDITSC_FAILURE;
1690
1691 /*
1692 * we need to fix up the return code in the audit logs if the
1693 * actual return codes are later going to be fixed up by the
1694 * arch specific signal handlers
1695 *
1696 * This is actually a test for:
1697 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
1698 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
1699 *
1700 * but is faster than a bunch of ||
1701 */
1702 if (unlikely(return_code <= -ERESTARTSYS) &&
1703 (return_code >= -ERESTART_RESTARTBLOCK) &&
1704 (return_code != -ENOIOCTLCMD))
1705 context->return_code = -EINTR;
1706 else
1707 context->return_code = return_code;
1708
1709 audit_filter_syscall(current, context,
1710 &audit_filter_list[AUDIT_FILTER_EXIT]);
1711 audit_filter_inodes(current, context);
1712 if (context->current_state == AUDIT_RECORD_CONTEXT)
1713 audit_log_exit();
1714 }
1715
1716 context->in_syscall = 0;
1717 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
1718
1719 audit_free_module(context);
1720 audit_free_names(context);
1721 unroll_tree_refs(context, NULL, 0);
1722 audit_free_aux(context);
1723 context->aux = NULL;
1724 context->aux_pids = NULL;
1725 context->target_pid = 0;
1726 context->target_sid = 0;
1727 context->sockaddr_len = 0;
1728 context->type = 0;
1729 context->fds[0] = -1;
1730 if (context->state != AUDIT_RECORD_CONTEXT) {
1731 kfree(context->filterkey);
1732 context->filterkey = NULL;
1733 }
1734}
1735
1736static inline void handle_one(const struct inode *inode)
1737{
1738 struct audit_context *context;
1739 struct audit_tree_refs *p;
1740 struct audit_chunk *chunk;
1741 int count;
1742 if (likely(!inode->i_fsnotify_marks))
1743 return;
1744 context = audit_context();
1745 p = context->trees;
1746 count = context->tree_count;
1747 rcu_read_lock();
1748 chunk = audit_tree_lookup(inode);
1749 rcu_read_unlock();
1750 if (!chunk)
1751 return;
1752 if (likely(put_tree_ref(context, chunk)))
1753 return;
1754 if (unlikely(!grow_tree_refs(context))) {
1755 pr_warn("out of memory, audit has lost a tree reference\n");
1756 audit_set_auditable(context);
1757 audit_put_chunk(chunk);
1758 unroll_tree_refs(context, p, count);
1759 return;
1760 }
1761 put_tree_ref(context, chunk);
1762}
1763
1764static void handle_path(const struct dentry *dentry)
1765{
1766 struct audit_context *context;
1767 struct audit_tree_refs *p;
1768 const struct dentry *d, *parent;
1769 struct audit_chunk *drop;
1770 unsigned long seq;
1771 int count;
1772
1773 context = audit_context();
1774 p = context->trees;
1775 count = context->tree_count;
1776retry:
1777 drop = NULL;
1778 d = dentry;
1779 rcu_read_lock();
1780 seq = read_seqbegin(&rename_lock);
1781 for(;;) {
1782 struct inode *inode = d_backing_inode(d);
1783 if (inode && unlikely(inode->i_fsnotify_marks)) {
1784 struct audit_chunk *chunk;
1785 chunk = audit_tree_lookup(inode);
1786 if (chunk) {
1787 if (unlikely(!put_tree_ref(context, chunk))) {
1788 drop = chunk;
1789 break;
1790 }
1791 }
1792 }
1793 parent = d->d_parent;
1794 if (parent == d)
1795 break;
1796 d = parent;
1797 }
1798 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1799 rcu_read_unlock();
1800 if (!drop) {
1801 /* just a race with rename */
1802 unroll_tree_refs(context, p, count);
1803 goto retry;
1804 }
1805 audit_put_chunk(drop);
1806 if (grow_tree_refs(context)) {
1807 /* OK, got more space */
1808 unroll_tree_refs(context, p, count);
1809 goto retry;
1810 }
1811 /* too bad */
1812 pr_warn("out of memory, audit has lost a tree reference\n");
1813 unroll_tree_refs(context, p, count);
1814 audit_set_auditable(context);
1815 return;
1816 }
1817 rcu_read_unlock();
1818}
1819
1820static struct audit_names *audit_alloc_name(struct audit_context *context,
1821 unsigned char type)
1822{
1823 struct audit_names *aname;
1824
1825 if (context->name_count < AUDIT_NAMES) {
1826 aname = &context->preallocated_names[context->name_count];
1827 memset(aname, 0, sizeof(*aname));
1828 } else {
1829 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1830 if (!aname)
1831 return NULL;
1832 aname->should_free = true;
1833 }
1834
1835 aname->ino = AUDIT_INO_UNSET;
1836 aname->type = type;
1837 list_add_tail(&aname->list, &context->names_list);
1838
1839 context->name_count++;
1840 return aname;
1841}
1842
1843/**
1844 * __audit_reusename - fill out filename with info from existing entry
1845 * @uptr: userland ptr to pathname
1846 *
1847 * Search the audit_names list for the current audit context. If there is an
1848 * existing entry with a matching "uptr" then return the filename
1849 * associated with that audit_name. If not, return NULL.
1850 */
1851struct filename *
1852__audit_reusename(const __user char *uptr)
1853{
1854 struct audit_context *context = audit_context();
1855 struct audit_names *n;
1856
1857 list_for_each_entry(n, &context->names_list, list) {
1858 if (!n->name)
1859 continue;
1860 if (n->name->uptr == uptr) {
1861 n->name->refcnt++;
1862 return n->name;
1863 }
1864 }
1865 return NULL;
1866}
1867
1868/**
1869 * __audit_getname - add a name to the list
1870 * @name: name to add
1871 *
1872 * Add a name to the list of audit names for this context.
1873 * Called from fs/namei.c:getname().
1874 */
1875void __audit_getname(struct filename *name)
1876{
1877 struct audit_context *context = audit_context();
1878 struct audit_names *n;
1879
1880 if (!context->in_syscall)
1881 return;
1882
1883 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1884 if (!n)
1885 return;
1886
1887 n->name = name;
1888 n->name_len = AUDIT_NAME_FULL;
1889 name->aname = n;
1890 name->refcnt++;
1891
1892 if (!context->pwd.dentry)
1893 get_fs_pwd(current->fs, &context->pwd);
1894}
1895
1896static inline int audit_copy_fcaps(struct audit_names *name,
1897 const struct dentry *dentry)
1898{
1899 struct cpu_vfs_cap_data caps;
1900 int rc;
1901
1902 if (!dentry)
1903 return 0;
1904
1905 rc = get_vfs_caps_from_disk(dentry, &caps);
1906 if (rc)
1907 return rc;
1908
1909 name->fcap.permitted = caps.permitted;
1910 name->fcap.inheritable = caps.inheritable;
1911 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1912 name->fcap.rootid = caps.rootid;
1913 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1914 VFS_CAP_REVISION_SHIFT;
1915
1916 return 0;
1917}
1918
1919/* Copy inode data into an audit_names. */
1920static void audit_copy_inode(struct audit_names *name,
1921 const struct dentry *dentry,
1922 struct inode *inode, unsigned int flags)
1923{
1924 name->ino = inode->i_ino;
1925 name->dev = inode->i_sb->s_dev;
1926 name->mode = inode->i_mode;
1927 name->uid = inode->i_uid;
1928 name->gid = inode->i_gid;
1929 name->rdev = inode->i_rdev;
1930 security_inode_getsecid(inode, &name->osid);
1931 if (flags & AUDIT_INODE_NOEVAL) {
1932 name->fcap_ver = -1;
1933 return;
1934 }
1935 audit_copy_fcaps(name, dentry);
1936}
1937
1938/**
1939 * __audit_inode - store the inode and device from a lookup
1940 * @name: name being audited
1941 * @dentry: dentry being audited
1942 * @flags: attributes for this particular entry
1943 */
1944void __audit_inode(struct filename *name, const struct dentry *dentry,
1945 unsigned int flags)
1946{
1947 struct audit_context *context = audit_context();
1948 struct inode *inode = d_backing_inode(dentry);
1949 struct audit_names *n;
1950 bool parent = flags & AUDIT_INODE_PARENT;
1951 struct audit_entry *e;
1952 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
1953 int i;
1954
1955 if (!context->in_syscall)
1956 return;
1957
1958 rcu_read_lock();
1959 list_for_each_entry_rcu(e, list, list) {
1960 for (i = 0; i < e->rule.field_count; i++) {
1961 struct audit_field *f = &e->rule.fields[i];
1962
1963 if (f->type == AUDIT_FSTYPE
1964 && audit_comparator(inode->i_sb->s_magic,
1965 f->op, f->val)
1966 && e->rule.action == AUDIT_NEVER) {
1967 rcu_read_unlock();
1968 return;
1969 }
1970 }
1971 }
1972 rcu_read_unlock();
1973
1974 if (!name)
1975 goto out_alloc;
1976
1977 /*
1978 * If we have a pointer to an audit_names entry already, then we can
1979 * just use it directly if the type is correct.
1980 */
1981 n = name->aname;
1982 if (n) {
1983 if (parent) {
1984 if (n->type == AUDIT_TYPE_PARENT ||
1985 n->type == AUDIT_TYPE_UNKNOWN)
1986 goto out;
1987 } else {
1988 if (n->type != AUDIT_TYPE_PARENT)
1989 goto out;
1990 }
1991 }
1992
1993 list_for_each_entry_reverse(n, &context->names_list, list) {
1994 if (n->ino) {
1995 /* valid inode number, use that for the comparison */
1996 if (n->ino != inode->i_ino ||
1997 n->dev != inode->i_sb->s_dev)
1998 continue;
1999 } else if (n->name) {
2000 /* inode number has not been set, check the name */
2001 if (strcmp(n->name->name, name->name))
2002 continue;
2003 } else
2004 /* no inode and no name (?!) ... this is odd ... */
2005 continue;
2006
2007 /* match the correct record type */
2008 if (parent) {
2009 if (n->type == AUDIT_TYPE_PARENT ||
2010 n->type == AUDIT_TYPE_UNKNOWN)
2011 goto out;
2012 } else {
2013 if (n->type != AUDIT_TYPE_PARENT)
2014 goto out;
2015 }
2016 }
2017
2018out_alloc:
2019 /* unable to find an entry with both a matching name and type */
2020 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
2021 if (!n)
2022 return;
2023 if (name) {
2024 n->name = name;
2025 name->refcnt++;
2026 }
2027
2028out:
2029 if (parent) {
2030 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
2031 n->type = AUDIT_TYPE_PARENT;
2032 if (flags & AUDIT_INODE_HIDDEN)
2033 n->hidden = true;
2034 } else {
2035 n->name_len = AUDIT_NAME_FULL;
2036 n->type = AUDIT_TYPE_NORMAL;
2037 }
2038 handle_path(dentry);
2039 audit_copy_inode(n, dentry, inode, flags & AUDIT_INODE_NOEVAL);
2040}
2041
2042void __audit_file(const struct file *file)
2043{
2044 __audit_inode(NULL, file->f_path.dentry, 0);
2045}
2046
2047/**
2048 * __audit_inode_child - collect inode info for created/removed objects
2049 * @parent: inode of dentry parent
2050 * @dentry: dentry being audited
2051 * @type: AUDIT_TYPE_* value that we're looking for
2052 *
2053 * For syscalls that create or remove filesystem objects, audit_inode
2054 * can only collect information for the filesystem object's parent.
2055 * This call updates the audit context with the child's information.
2056 * Syscalls that create a new filesystem object must be hooked after
2057 * the object is created. Syscalls that remove a filesystem object
2058 * must be hooked prior, in order to capture the target inode during
2059 * unsuccessful attempts.
2060 */
2061void __audit_inode_child(struct inode *parent,
2062 const struct dentry *dentry,
2063 const unsigned char type)
2064{
2065 struct audit_context *context = audit_context();
2066 struct inode *inode = d_backing_inode(dentry);
2067 const struct qstr *dname = &dentry->d_name;
2068 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
2069 struct audit_entry *e;
2070 struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
2071 int i;
2072
2073 if (!context->in_syscall)
2074 return;
2075
2076 rcu_read_lock();
2077 list_for_each_entry_rcu(e, list, list) {
2078 for (i = 0; i < e->rule.field_count; i++) {
2079 struct audit_field *f = &e->rule.fields[i];
2080
2081 if (f->type == AUDIT_FSTYPE
2082 && audit_comparator(parent->i_sb->s_magic,
2083 f->op, f->val)
2084 && e->rule.action == AUDIT_NEVER) {
2085 rcu_read_unlock();
2086 return;
2087 }
2088 }
2089 }
2090 rcu_read_unlock();
2091
2092 if (inode)
2093 handle_one(inode);
2094
2095 /* look for a parent entry first */
2096 list_for_each_entry(n, &context->names_list, list) {
2097 if (!n->name ||
2098 (n->type != AUDIT_TYPE_PARENT &&
2099 n->type != AUDIT_TYPE_UNKNOWN))
2100 continue;
2101
2102 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
2103 !audit_compare_dname_path(dname,
2104 n->name->name, n->name_len)) {
2105 if (n->type == AUDIT_TYPE_UNKNOWN)
2106 n->type = AUDIT_TYPE_PARENT;
2107 found_parent = n;
2108 break;
2109 }
2110 }
2111
2112 /* is there a matching child entry? */
2113 list_for_each_entry(n, &context->names_list, list) {
2114 /* can only match entries that have a name */
2115 if (!n->name ||
2116 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
2117 continue;
2118
2119 if (!strcmp(dname->name, n->name->name) ||
2120 !audit_compare_dname_path(dname, n->name->name,
2121 found_parent ?
2122 found_parent->name_len :
2123 AUDIT_NAME_FULL)) {
2124 if (n->type == AUDIT_TYPE_UNKNOWN)
2125 n->type = type;
2126 found_child = n;
2127 break;
2128 }
2129 }
2130
2131 if (!found_parent) {
2132 /* create a new, "anonymous" parent record */
2133 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
2134 if (!n)
2135 return;
2136 audit_copy_inode(n, NULL, parent, 0);
2137 }
2138
2139 if (!found_child) {
2140 found_child = audit_alloc_name(context, type);
2141 if (!found_child)
2142 return;
2143
2144 /* Re-use the name belonging to the slot for a matching parent
2145 * directory. All names for this context are relinquished in
2146 * audit_free_names() */
2147 if (found_parent) {
2148 found_child->name = found_parent->name;
2149 found_child->name_len = AUDIT_NAME_FULL;
2150 found_child->name->refcnt++;
2151 }
2152 }
2153
2154 if (inode)
2155 audit_copy_inode(found_child, dentry, inode, 0);
2156 else
2157 found_child->ino = AUDIT_INO_UNSET;
2158}
2159EXPORT_SYMBOL_GPL(__audit_inode_child);
2160
2161/**
2162 * auditsc_get_stamp - get local copies of audit_context values
2163 * @ctx: audit_context for the task
2164 * @t: timespec64 to store time recorded in the audit_context
2165 * @serial: serial value that is recorded in the audit_context
2166 *
2167 * Also sets the context as auditable.
2168 */
2169int auditsc_get_stamp(struct audit_context *ctx,
2170 struct timespec64 *t, unsigned int *serial)
2171{
2172 if (!ctx->in_syscall)
2173 return 0;
2174 if (!ctx->serial)
2175 ctx->serial = audit_serial();
2176 t->tv_sec = ctx->ctime.tv_sec;
2177 t->tv_nsec = ctx->ctime.tv_nsec;
2178 *serial = ctx->serial;
2179 if (!ctx->prio) {
2180 ctx->prio = 1;
2181 ctx->current_state = AUDIT_RECORD_CONTEXT;
2182 }
2183 return 1;
2184}
2185
2186/**
2187 * __audit_mq_open - record audit data for a POSIX MQ open
2188 * @oflag: open flag
2189 * @mode: mode bits
2190 * @attr: queue attributes
2191 *
2192 */
2193void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2194{
2195 struct audit_context *context = audit_context();
2196
2197 if (attr)
2198 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2199 else
2200 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2201
2202 context->mq_open.oflag = oflag;
2203 context->mq_open.mode = mode;
2204
2205 context->type = AUDIT_MQ_OPEN;
2206}
2207
2208/**
2209 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2210 * @mqdes: MQ descriptor
2211 * @msg_len: Message length
2212 * @msg_prio: Message priority
2213 * @abs_timeout: Message timeout in absolute time
2214 *
2215 */
2216void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2217 const struct timespec64 *abs_timeout)
2218{
2219 struct audit_context *context = audit_context();
2220 struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
2221
2222 if (abs_timeout)
2223 memcpy(p, abs_timeout, sizeof(*p));
2224 else
2225 memset(p, 0, sizeof(*p));
2226
2227 context->mq_sendrecv.mqdes = mqdes;
2228 context->mq_sendrecv.msg_len = msg_len;
2229 context->mq_sendrecv.msg_prio = msg_prio;
2230
2231 context->type = AUDIT_MQ_SENDRECV;
2232}
2233
2234/**
2235 * __audit_mq_notify - record audit data for a POSIX MQ notify
2236 * @mqdes: MQ descriptor
2237 * @notification: Notification event
2238 *
2239 */
2240
2241void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2242{
2243 struct audit_context *context = audit_context();
2244
2245 if (notification)
2246 context->mq_notify.sigev_signo = notification->sigev_signo;
2247 else
2248 context->mq_notify.sigev_signo = 0;
2249
2250 context->mq_notify.mqdes = mqdes;
2251 context->type = AUDIT_MQ_NOTIFY;
2252}
2253
2254/**
2255 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2256 * @mqdes: MQ descriptor
2257 * @mqstat: MQ flags
2258 *
2259 */
2260void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2261{
2262 struct audit_context *context = audit_context();
2263 context->mq_getsetattr.mqdes = mqdes;
2264 context->mq_getsetattr.mqstat = *mqstat;
2265 context->type = AUDIT_MQ_GETSETATTR;
2266}
2267
2268/**
2269 * __audit_ipc_obj - record audit data for ipc object
2270 * @ipcp: ipc permissions
2271 *
2272 */
2273void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2274{
2275 struct audit_context *context = audit_context();
2276 context->ipc.uid = ipcp->uid;
2277 context->ipc.gid = ipcp->gid;
2278 context->ipc.mode = ipcp->mode;
2279 context->ipc.has_perm = 0;
2280 security_ipc_getsecid(ipcp, &context->ipc.osid);
2281 context->type = AUDIT_IPC;
2282}
2283
2284/**
2285 * __audit_ipc_set_perm - record audit data for new ipc permissions
2286 * @qbytes: msgq bytes
2287 * @uid: msgq user id
2288 * @gid: msgq group id
2289 * @mode: msgq mode (permissions)
2290 *
2291 * Called only after audit_ipc_obj().
2292 */
2293void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2294{
2295 struct audit_context *context = audit_context();
2296
2297 context->ipc.qbytes = qbytes;
2298 context->ipc.perm_uid = uid;
2299 context->ipc.perm_gid = gid;
2300 context->ipc.perm_mode = mode;
2301 context->ipc.has_perm = 1;
2302}
2303
2304void __audit_bprm(struct linux_binprm *bprm)
2305{
2306 struct audit_context *context = audit_context();
2307
2308 context->type = AUDIT_EXECVE;
2309 context->execve.argc = bprm->argc;
2310}
2311
2312
2313/**
2314 * __audit_socketcall - record audit data for sys_socketcall
2315 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2316 * @args: args array
2317 *
2318 */
2319int __audit_socketcall(int nargs, unsigned long *args)
2320{
2321 struct audit_context *context = audit_context();
2322
2323 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2324 return -EINVAL;
2325 context->type = AUDIT_SOCKETCALL;
2326 context->socketcall.nargs = nargs;
2327 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2328 return 0;
2329}
2330
2331/**
2332 * __audit_fd_pair - record audit data for pipe and socketpair
2333 * @fd1: the first file descriptor
2334 * @fd2: the second file descriptor
2335 *
2336 */
2337void __audit_fd_pair(int fd1, int fd2)
2338{
2339 struct audit_context *context = audit_context();
2340 context->fds[0] = fd1;
2341 context->fds[1] = fd2;
2342}
2343
2344/**
2345 * __audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2346 * @len: data length in user space
2347 * @a: data address in kernel space
2348 *
2349 * Returns 0 for success or NULL context or < 0 on error.
2350 */
2351int __audit_sockaddr(int len, void *a)
2352{
2353 struct audit_context *context = audit_context();
2354
2355 if (!context->sockaddr) {
2356 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2357 if (!p)
2358 return -ENOMEM;
2359 context->sockaddr = p;
2360 }
2361
2362 context->sockaddr_len = len;
2363 memcpy(context->sockaddr, a, len);
2364 return 0;
2365}
2366
2367void __audit_ptrace(struct task_struct *t)
2368{
2369 struct audit_context *context = audit_context();
2370
2371 context->target_pid = task_tgid_nr(t);
2372 context->target_auid = audit_get_loginuid(t);
2373 context->target_uid = task_uid(t);
2374 context->target_sessionid = audit_get_sessionid(t);
2375 security_task_getsecid(t, &context->target_sid);
2376 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2377}
2378
2379/**
2380 * audit_signal_info_syscall - record signal info for syscalls
2381 * @t: task being signaled
2382 *
2383 * If the audit subsystem is being terminated, record the task (pid)
2384 * and uid that is doing that.
2385 */
2386int audit_signal_info_syscall(struct task_struct *t)
2387{
2388 struct audit_aux_data_pids *axp;
2389 struct audit_context *ctx = audit_context();
2390 kuid_t t_uid = task_uid(t);
2391
2392 if (!audit_signals || audit_dummy_context())
2393 return 0;
2394
2395 /* optimize the common case by putting first signal recipient directly
2396 * in audit_context */
2397 if (!ctx->target_pid) {
2398 ctx->target_pid = task_tgid_nr(t);
2399 ctx->target_auid = audit_get_loginuid(t);
2400 ctx->target_uid = t_uid;
2401 ctx->target_sessionid = audit_get_sessionid(t);
2402 security_task_getsecid(t, &ctx->target_sid);
2403 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2404 return 0;
2405 }
2406
2407 axp = (void *)ctx->aux_pids;
2408 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2409 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2410 if (!axp)
2411 return -ENOMEM;
2412
2413 axp->d.type = AUDIT_OBJ_PID;
2414 axp->d.next = ctx->aux_pids;
2415 ctx->aux_pids = (void *)axp;
2416 }
2417 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2418
2419 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2420 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2421 axp->target_uid[axp->pid_count] = t_uid;
2422 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2423 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2424 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2425 axp->pid_count++;
2426
2427 return 0;
2428}
2429
2430/**
2431 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2432 * @bprm: pointer to the bprm being processed
2433 * @new: the proposed new credentials
2434 * @old: the old credentials
2435 *
2436 * Simply check if the proc already has the caps given by the file and if not
2437 * store the priv escalation info for later auditing at the end of the syscall
2438 *
2439 * -Eric
2440 */
2441int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2442 const struct cred *new, const struct cred *old)
2443{
2444 struct audit_aux_data_bprm_fcaps *ax;
2445 struct audit_context *context = audit_context();
2446 struct cpu_vfs_cap_data vcaps;
2447
2448 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2449 if (!ax)
2450 return -ENOMEM;
2451
2452 ax->d.type = AUDIT_BPRM_FCAPS;
2453 ax->d.next = context->aux;
2454 context->aux = (void *)ax;
2455
2456 get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
2457
2458 ax->fcap.permitted = vcaps.permitted;
2459 ax->fcap.inheritable = vcaps.inheritable;
2460 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2461 ax->fcap.rootid = vcaps.rootid;
2462 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2463
2464 ax->old_pcap.permitted = old->cap_permitted;
2465 ax->old_pcap.inheritable = old->cap_inheritable;
2466 ax->old_pcap.effective = old->cap_effective;
2467 ax->old_pcap.ambient = old->cap_ambient;
2468
2469 ax->new_pcap.permitted = new->cap_permitted;
2470 ax->new_pcap.inheritable = new->cap_inheritable;
2471 ax->new_pcap.effective = new->cap_effective;
2472 ax->new_pcap.ambient = new->cap_ambient;
2473 return 0;
2474}
2475
2476/**
2477 * __audit_log_capset - store information about the arguments to the capset syscall
2478 * @new: the new credentials
2479 * @old: the old (current) credentials
2480 *
2481 * Record the arguments userspace sent to sys_capset for later printing by the
2482 * audit system if applicable
2483 */
2484void __audit_log_capset(const struct cred *new, const struct cred *old)
2485{
2486 struct audit_context *context = audit_context();
2487 context->capset.pid = task_tgid_nr(current);
2488 context->capset.cap.effective = new->cap_effective;
2489 context->capset.cap.inheritable = new->cap_effective;
2490 context->capset.cap.permitted = new->cap_permitted;
2491 context->capset.cap.ambient = new->cap_ambient;
2492 context->type = AUDIT_CAPSET;
2493}
2494
2495void __audit_mmap_fd(int fd, int flags)
2496{
2497 struct audit_context *context = audit_context();
2498 context->mmap.fd = fd;
2499 context->mmap.flags = flags;
2500 context->type = AUDIT_MMAP;
2501}
2502
2503void __audit_log_kern_module(char *name)
2504{
2505 struct audit_context *context = audit_context();
2506
2507 context->module.name = kstrdup(name, GFP_KERNEL);
2508 if (!context->module.name)
2509 audit_log_lost("out of memory in __audit_log_kern_module");
2510 context->type = AUDIT_KERN_MODULE;
2511}
2512
2513void __audit_fanotify(unsigned int response)
2514{
2515 audit_log(audit_context(), GFP_KERNEL,
2516 AUDIT_FANOTIFY, "resp=%u", response);
2517}
2518
2519void __audit_tk_injoffset(struct timespec64 offset)
2520{
2521 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_INJOFFSET,
2522 "sec=%lli nsec=%li",
2523 (long long)offset.tv_sec, offset.tv_nsec);
2524}
2525
2526static void audit_log_ntp_val(const struct audit_ntp_data *ad,
2527 const char *op, enum audit_ntp_type type)
2528{
2529 const struct audit_ntp_val *val = &ad->vals[type];
2530
2531 if (val->newval == val->oldval)
2532 return;
2533
2534 audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL,
2535 "op=%s old=%lli new=%lli", op, val->oldval, val->newval);
2536}
2537
2538void __audit_ntp_log(const struct audit_ntp_data *ad)
2539{
2540 audit_log_ntp_val(ad, "offset", AUDIT_NTP_OFFSET);
2541 audit_log_ntp_val(ad, "freq", AUDIT_NTP_FREQ);
2542 audit_log_ntp_val(ad, "status", AUDIT_NTP_STATUS);
2543 audit_log_ntp_val(ad, "tai", AUDIT_NTP_TAI);
2544 audit_log_ntp_val(ad, "tick", AUDIT_NTP_TICK);
2545 audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
2546}
2547
2548static void audit_log_task(struct audit_buffer *ab)
2549{
2550 kuid_t auid, uid;
2551 kgid_t gid;
2552 unsigned int sessionid;
2553 char comm[sizeof(current->comm)];
2554
2555 auid = audit_get_loginuid(current);
2556 sessionid = audit_get_sessionid(current);
2557 current_uid_gid(&uid, &gid);
2558
2559 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2560 from_kuid(&init_user_ns, auid),
2561 from_kuid(&init_user_ns, uid),
2562 from_kgid(&init_user_ns, gid),
2563 sessionid);
2564 audit_log_task_context(ab);
2565 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
2566 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2567 audit_log_d_path_exe(ab, current->mm);
2568}
2569
2570/**
2571 * audit_core_dumps - record information about processes that end abnormally
2572 * @signr: signal value
2573 *
2574 * If a process ends with a core dump, something fishy is going on and we
2575 * should record the event for investigation.
2576 */
2577void audit_core_dumps(long signr)
2578{
2579 struct audit_buffer *ab;
2580
2581 if (!audit_enabled)
2582 return;
2583
2584 if (signr == SIGQUIT) /* don't care for those */
2585 return;
2586
2587 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND);
2588 if (unlikely(!ab))
2589 return;
2590 audit_log_task(ab);
2591 audit_log_format(ab, " sig=%ld res=1", signr);
2592 audit_log_end(ab);
2593}
2594
2595/**
2596 * audit_seccomp - record information about a seccomp action
2597 * @syscall: syscall number
2598 * @signr: signal value
2599 * @code: the seccomp action
2600 *
2601 * Record the information associated with a seccomp action. Event filtering for
2602 * seccomp actions that are not to be logged is done in seccomp_log().
2603 * Therefore, this function forces auditing independent of the audit_enabled
2604 * and dummy context state because seccomp actions should be logged even when
2605 * audit is not in use.
2606 */
2607void audit_seccomp(unsigned long syscall, long signr, int code)
2608{
2609 struct audit_buffer *ab;
2610
2611 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_SECCOMP);
2612 if (unlikely(!ab))
2613 return;
2614 audit_log_task(ab);
2615 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
2616 signr, syscall_get_arch(current), syscall,
2617 in_compat_syscall(), KSTK_EIP(current), code);
2618 audit_log_end(ab);
2619}
2620
2621void audit_seccomp_actions_logged(const char *names, const char *old_names,
2622 int res)
2623{
2624 struct audit_buffer *ab;
2625
2626 if (!audit_enabled)
2627 return;
2628
2629 ab = audit_log_start(audit_context(), GFP_KERNEL,
2630 AUDIT_CONFIG_CHANGE);
2631 if (unlikely(!ab))
2632 return;
2633
2634 audit_log_format(ab,
2635 "op=seccomp-logging actions=%s old-actions=%s res=%d",
2636 names, old_names, res);
2637 audit_log_end(ab);
2638}
2639
2640struct list_head *audit_killed_trees(void)
2641{
2642 struct audit_context *ctx = audit_context();
2643 if (likely(!ctx || !ctx->in_syscall))
2644 return NULL;
2645 return &ctx->killed_trees;
2646}
1/* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
3 *
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright (C) 2005, 2006 IBM Corporation
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 *
32 * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
33 * 2006.
34 *
35 * The support of additional filter rules compares (>, <, >=, <=) was
36 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
37 *
38 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
39 * filesystem information.
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.
43 */
44
45#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46
47#include <linux/init.h>
48#include <asm/types.h>
49#include <linux/atomic.h>
50#include <linux/fs.h>
51#include <linux/namei.h>
52#include <linux/mm.h>
53#include <linux/export.h>
54#include <linux/slab.h>
55#include <linux/mount.h>
56#include <linux/socket.h>
57#include <linux/mqueue.h>
58#include <linux/audit.h>
59#include <linux/personality.h>
60#include <linux/time.h>
61#include <linux/netlink.h>
62#include <linux/compiler.h>
63#include <asm/unistd.h>
64#include <linux/security.h>
65#include <linux/list.h>
66#include <linux/binfmts.h>
67#include <linux/highmem.h>
68#include <linux/syscalls.h>
69#include <asm/syscall.h>
70#include <linux/capability.h>
71#include <linux/fs_struct.h>
72#include <linux/compat.h>
73#include <linux/ctype.h>
74#include <linux/string.h>
75#include <linux/uaccess.h>
76#include <uapi/linux/limits.h>
77
78#include "audit.h"
79
80/* flags stating the success for a syscall */
81#define AUDITSC_INVALID 0
82#define AUDITSC_SUCCESS 1
83#define AUDITSC_FAILURE 2
84
85/* no execve audit message should be longer than this (userspace limits),
86 * see the note near the top of audit_log_execve_info() about this value */
87#define MAX_EXECVE_AUDIT_LEN 7500
88
89/* max length to print of cmdline/proctitle value during audit */
90#define MAX_PROCTITLE_AUDIT_LEN 128
91
92/* number of audit rules */
93int audit_n_rules;
94
95/* determines whether we collect data for signals sent */
96int audit_signals;
97
98struct audit_aux_data {
99 struct audit_aux_data *next;
100 int type;
101};
102
103#define AUDIT_AUX_IPCPERM 0
104
105/* Number of target pids per aux struct. */
106#define AUDIT_AUX_PIDS 16
107
108struct audit_aux_data_pids {
109 struct audit_aux_data d;
110 pid_t target_pid[AUDIT_AUX_PIDS];
111 kuid_t target_auid[AUDIT_AUX_PIDS];
112 kuid_t target_uid[AUDIT_AUX_PIDS];
113 unsigned int target_sessionid[AUDIT_AUX_PIDS];
114 u32 target_sid[AUDIT_AUX_PIDS];
115 char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
116 int pid_count;
117};
118
119struct audit_aux_data_bprm_fcaps {
120 struct audit_aux_data d;
121 struct audit_cap_data fcap;
122 unsigned int fcap_ver;
123 struct audit_cap_data old_pcap;
124 struct audit_cap_data new_pcap;
125};
126
127struct audit_tree_refs {
128 struct audit_tree_refs *next;
129 struct audit_chunk *c[31];
130};
131
132static int audit_match_perm(struct audit_context *ctx, int mask)
133{
134 unsigned n;
135 if (unlikely(!ctx))
136 return 0;
137 n = ctx->major;
138
139 switch (audit_classify_syscall(ctx->arch, n)) {
140 case 0: /* native */
141 if ((mask & AUDIT_PERM_WRITE) &&
142 audit_match_class(AUDIT_CLASS_WRITE, n))
143 return 1;
144 if ((mask & AUDIT_PERM_READ) &&
145 audit_match_class(AUDIT_CLASS_READ, n))
146 return 1;
147 if ((mask & AUDIT_PERM_ATTR) &&
148 audit_match_class(AUDIT_CLASS_CHATTR, n))
149 return 1;
150 return 0;
151 case 1: /* 32bit on biarch */
152 if ((mask & AUDIT_PERM_WRITE) &&
153 audit_match_class(AUDIT_CLASS_WRITE_32, n))
154 return 1;
155 if ((mask & AUDIT_PERM_READ) &&
156 audit_match_class(AUDIT_CLASS_READ_32, n))
157 return 1;
158 if ((mask & AUDIT_PERM_ATTR) &&
159 audit_match_class(AUDIT_CLASS_CHATTR_32, n))
160 return 1;
161 return 0;
162 case 2: /* open */
163 return mask & ACC_MODE(ctx->argv[1]);
164 case 3: /* openat */
165 return mask & ACC_MODE(ctx->argv[2]);
166 case 4: /* socketcall */
167 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
168 case 5: /* execve */
169 return mask & AUDIT_PERM_EXEC;
170 default:
171 return 0;
172 }
173}
174
175static int audit_match_filetype(struct audit_context *ctx, int val)
176{
177 struct audit_names *n;
178 umode_t mode = (umode_t)val;
179
180 if (unlikely(!ctx))
181 return 0;
182
183 list_for_each_entry(n, &ctx->names_list, list) {
184 if ((n->ino != AUDIT_INO_UNSET) &&
185 ((n->mode & S_IFMT) == mode))
186 return 1;
187 }
188
189 return 0;
190}
191
192/*
193 * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
194 * ->first_trees points to its beginning, ->trees - to the current end of data.
195 * ->tree_count is the number of free entries in array pointed to by ->trees.
196 * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
197 * "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
198 * it's going to remain 1-element for almost any setup) until we free context itself.
199 * References in it _are_ dropped - at the same time we free/drop aux stuff.
200 */
201
202#ifdef CONFIG_AUDIT_TREE
203static void audit_set_auditable(struct audit_context *ctx)
204{
205 if (!ctx->prio) {
206 ctx->prio = 1;
207 ctx->current_state = AUDIT_RECORD_CONTEXT;
208 }
209}
210
211static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
212{
213 struct audit_tree_refs *p = ctx->trees;
214 int left = ctx->tree_count;
215 if (likely(left)) {
216 p->c[--left] = chunk;
217 ctx->tree_count = left;
218 return 1;
219 }
220 if (!p)
221 return 0;
222 p = p->next;
223 if (p) {
224 p->c[30] = chunk;
225 ctx->trees = p;
226 ctx->tree_count = 30;
227 return 1;
228 }
229 return 0;
230}
231
232static int grow_tree_refs(struct audit_context *ctx)
233{
234 struct audit_tree_refs *p = ctx->trees;
235 ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
236 if (!ctx->trees) {
237 ctx->trees = p;
238 return 0;
239 }
240 if (p)
241 p->next = ctx->trees;
242 else
243 ctx->first_trees = ctx->trees;
244 ctx->tree_count = 31;
245 return 1;
246}
247#endif
248
249static void unroll_tree_refs(struct audit_context *ctx,
250 struct audit_tree_refs *p, int count)
251{
252#ifdef CONFIG_AUDIT_TREE
253 struct audit_tree_refs *q;
254 int n;
255 if (!p) {
256 /* we started with empty chain */
257 p = ctx->first_trees;
258 count = 31;
259 /* if the very first allocation has failed, nothing to do */
260 if (!p)
261 return;
262 }
263 n = count;
264 for (q = p; q != ctx->trees; q = q->next, n = 31) {
265 while (n--) {
266 audit_put_chunk(q->c[n]);
267 q->c[n] = NULL;
268 }
269 }
270 while (n-- > ctx->tree_count) {
271 audit_put_chunk(q->c[n]);
272 q->c[n] = NULL;
273 }
274 ctx->trees = p;
275 ctx->tree_count = count;
276#endif
277}
278
279static void free_tree_refs(struct audit_context *ctx)
280{
281 struct audit_tree_refs *p, *q;
282 for (p = ctx->first_trees; p; p = q) {
283 q = p->next;
284 kfree(p);
285 }
286}
287
288static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
289{
290#ifdef CONFIG_AUDIT_TREE
291 struct audit_tree_refs *p;
292 int n;
293 if (!tree)
294 return 0;
295 /* full ones */
296 for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
297 for (n = 0; n < 31; n++)
298 if (audit_tree_match(p->c[n], tree))
299 return 1;
300 }
301 /* partial */
302 if (p) {
303 for (n = ctx->tree_count; n < 31; n++)
304 if (audit_tree_match(p->c[n], tree))
305 return 1;
306 }
307#endif
308 return 0;
309}
310
311static int audit_compare_uid(kuid_t uid,
312 struct audit_names *name,
313 struct audit_field *f,
314 struct audit_context *ctx)
315{
316 struct audit_names *n;
317 int rc;
318
319 if (name) {
320 rc = audit_uid_comparator(uid, f->op, name->uid);
321 if (rc)
322 return rc;
323 }
324
325 if (ctx) {
326 list_for_each_entry(n, &ctx->names_list, list) {
327 rc = audit_uid_comparator(uid, f->op, n->uid);
328 if (rc)
329 return rc;
330 }
331 }
332 return 0;
333}
334
335static int audit_compare_gid(kgid_t gid,
336 struct audit_names *name,
337 struct audit_field *f,
338 struct audit_context *ctx)
339{
340 struct audit_names *n;
341 int rc;
342
343 if (name) {
344 rc = audit_gid_comparator(gid, f->op, name->gid);
345 if (rc)
346 return rc;
347 }
348
349 if (ctx) {
350 list_for_each_entry(n, &ctx->names_list, list) {
351 rc = audit_gid_comparator(gid, f->op, n->gid);
352 if (rc)
353 return rc;
354 }
355 }
356 return 0;
357}
358
359static int audit_field_compare(struct task_struct *tsk,
360 const struct cred *cred,
361 struct audit_field *f,
362 struct audit_context *ctx,
363 struct audit_names *name)
364{
365 switch (f->val) {
366 /* process to file object comparisons */
367 case AUDIT_COMPARE_UID_TO_OBJ_UID:
368 return audit_compare_uid(cred->uid, name, f, ctx);
369 case AUDIT_COMPARE_GID_TO_OBJ_GID:
370 return audit_compare_gid(cred->gid, name, f, ctx);
371 case AUDIT_COMPARE_EUID_TO_OBJ_UID:
372 return audit_compare_uid(cred->euid, name, f, ctx);
373 case AUDIT_COMPARE_EGID_TO_OBJ_GID:
374 return audit_compare_gid(cred->egid, name, f, ctx);
375 case AUDIT_COMPARE_AUID_TO_OBJ_UID:
376 return audit_compare_uid(tsk->loginuid, name, f, ctx);
377 case AUDIT_COMPARE_SUID_TO_OBJ_UID:
378 return audit_compare_uid(cred->suid, name, f, ctx);
379 case AUDIT_COMPARE_SGID_TO_OBJ_GID:
380 return audit_compare_gid(cred->sgid, name, f, ctx);
381 case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
382 return audit_compare_uid(cred->fsuid, name, f, ctx);
383 case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
384 return audit_compare_gid(cred->fsgid, name, f, ctx);
385 /* uid comparisons */
386 case AUDIT_COMPARE_UID_TO_AUID:
387 return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
388 case AUDIT_COMPARE_UID_TO_EUID:
389 return audit_uid_comparator(cred->uid, f->op, cred->euid);
390 case AUDIT_COMPARE_UID_TO_SUID:
391 return audit_uid_comparator(cred->uid, f->op, cred->suid);
392 case AUDIT_COMPARE_UID_TO_FSUID:
393 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
394 /* auid comparisons */
395 case AUDIT_COMPARE_AUID_TO_EUID:
396 return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
397 case AUDIT_COMPARE_AUID_TO_SUID:
398 return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
399 case AUDIT_COMPARE_AUID_TO_FSUID:
400 return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
401 /* euid comparisons */
402 case AUDIT_COMPARE_EUID_TO_SUID:
403 return audit_uid_comparator(cred->euid, f->op, cred->suid);
404 case AUDIT_COMPARE_EUID_TO_FSUID:
405 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
406 /* suid comparisons */
407 case AUDIT_COMPARE_SUID_TO_FSUID:
408 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
409 /* gid comparisons */
410 case AUDIT_COMPARE_GID_TO_EGID:
411 return audit_gid_comparator(cred->gid, f->op, cred->egid);
412 case AUDIT_COMPARE_GID_TO_SGID:
413 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
414 case AUDIT_COMPARE_GID_TO_FSGID:
415 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
416 /* egid comparisons */
417 case AUDIT_COMPARE_EGID_TO_SGID:
418 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
419 case AUDIT_COMPARE_EGID_TO_FSGID:
420 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
421 /* sgid comparison */
422 case AUDIT_COMPARE_SGID_TO_FSGID:
423 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
424 default:
425 WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
426 return 0;
427 }
428 return 0;
429}
430
431/* Determine if any context name data matches a rule's watch data */
432/* Compare a task_struct with an audit_rule. Return 1 on match, 0
433 * otherwise.
434 *
435 * If task_creation is true, this is an explicit indication that we are
436 * filtering a task rule at task creation time. This and tsk == current are
437 * the only situations where tsk->cred may be accessed without an rcu read lock.
438 */
439static int audit_filter_rules(struct task_struct *tsk,
440 struct audit_krule *rule,
441 struct audit_context *ctx,
442 struct audit_names *name,
443 enum audit_state *state,
444 bool task_creation)
445{
446 const struct cred *cred;
447 int i, need_sid = 1;
448 u32 sid;
449 unsigned int sessionid;
450
451 cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
452
453 for (i = 0; i < rule->field_count; i++) {
454 struct audit_field *f = &rule->fields[i];
455 struct audit_names *n;
456 int result = 0;
457 pid_t pid;
458
459 switch (f->type) {
460 case AUDIT_PID:
461 pid = task_tgid_nr(tsk);
462 result = audit_comparator(pid, f->op, f->val);
463 break;
464 case AUDIT_PPID:
465 if (ctx) {
466 if (!ctx->ppid)
467 ctx->ppid = task_ppid_nr(tsk);
468 result = audit_comparator(ctx->ppid, f->op, f->val);
469 }
470 break;
471 case AUDIT_EXE:
472 result = audit_exe_compare(tsk, rule->exe);
473 break;
474 case AUDIT_UID:
475 result = audit_uid_comparator(cred->uid, f->op, f->uid);
476 break;
477 case AUDIT_EUID:
478 result = audit_uid_comparator(cred->euid, f->op, f->uid);
479 break;
480 case AUDIT_SUID:
481 result = audit_uid_comparator(cred->suid, f->op, f->uid);
482 break;
483 case AUDIT_FSUID:
484 result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
485 break;
486 case AUDIT_GID:
487 result = audit_gid_comparator(cred->gid, f->op, f->gid);
488 if (f->op == Audit_equal) {
489 if (!result)
490 result = in_group_p(f->gid);
491 } else if (f->op == Audit_not_equal) {
492 if (result)
493 result = !in_group_p(f->gid);
494 }
495 break;
496 case AUDIT_EGID:
497 result = audit_gid_comparator(cred->egid, f->op, f->gid);
498 if (f->op == Audit_equal) {
499 if (!result)
500 result = in_egroup_p(f->gid);
501 } else if (f->op == Audit_not_equal) {
502 if (result)
503 result = !in_egroup_p(f->gid);
504 }
505 break;
506 case AUDIT_SGID:
507 result = audit_gid_comparator(cred->sgid, f->op, f->gid);
508 break;
509 case AUDIT_FSGID:
510 result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
511 break;
512 case AUDIT_SESSIONID:
513 sessionid = audit_get_sessionid(current);
514 result = audit_comparator(sessionid, f->op, f->val);
515 break;
516 case AUDIT_PERS:
517 result = audit_comparator(tsk->personality, f->op, f->val);
518 break;
519 case AUDIT_ARCH:
520 if (ctx)
521 result = audit_comparator(ctx->arch, f->op, f->val);
522 break;
523
524 case AUDIT_EXIT:
525 if (ctx && ctx->return_valid)
526 result = audit_comparator(ctx->return_code, f->op, f->val);
527 break;
528 case AUDIT_SUCCESS:
529 if (ctx && ctx->return_valid) {
530 if (f->val)
531 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
532 else
533 result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
534 }
535 break;
536 case AUDIT_DEVMAJOR:
537 if (name) {
538 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
539 audit_comparator(MAJOR(name->rdev), f->op, f->val))
540 ++result;
541 } else if (ctx) {
542 list_for_each_entry(n, &ctx->names_list, list) {
543 if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
544 audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
545 ++result;
546 break;
547 }
548 }
549 }
550 break;
551 case AUDIT_DEVMINOR:
552 if (name) {
553 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
554 audit_comparator(MINOR(name->rdev), f->op, f->val))
555 ++result;
556 } else if (ctx) {
557 list_for_each_entry(n, &ctx->names_list, list) {
558 if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
559 audit_comparator(MINOR(n->rdev), f->op, f->val)) {
560 ++result;
561 break;
562 }
563 }
564 }
565 break;
566 case AUDIT_INODE:
567 if (name)
568 result = audit_comparator(name->ino, f->op, f->val);
569 else if (ctx) {
570 list_for_each_entry(n, &ctx->names_list, list) {
571 if (audit_comparator(n->ino, f->op, f->val)) {
572 ++result;
573 break;
574 }
575 }
576 }
577 break;
578 case AUDIT_OBJ_UID:
579 if (name) {
580 result = audit_uid_comparator(name->uid, f->op, f->uid);
581 } else if (ctx) {
582 list_for_each_entry(n, &ctx->names_list, list) {
583 if (audit_uid_comparator(n->uid, f->op, f->uid)) {
584 ++result;
585 break;
586 }
587 }
588 }
589 break;
590 case AUDIT_OBJ_GID:
591 if (name) {
592 result = audit_gid_comparator(name->gid, f->op, f->gid);
593 } else if (ctx) {
594 list_for_each_entry(n, &ctx->names_list, list) {
595 if (audit_gid_comparator(n->gid, f->op, f->gid)) {
596 ++result;
597 break;
598 }
599 }
600 }
601 break;
602 case AUDIT_WATCH:
603 if (name)
604 result = audit_watch_compare(rule->watch, name->ino, name->dev);
605 break;
606 case AUDIT_DIR:
607 if (ctx)
608 result = match_tree_refs(ctx, rule->tree);
609 break;
610 case AUDIT_LOGINUID:
611 result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
612 break;
613 case AUDIT_LOGINUID_SET:
614 result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
615 break;
616 case AUDIT_SUBJ_USER:
617 case AUDIT_SUBJ_ROLE:
618 case AUDIT_SUBJ_TYPE:
619 case AUDIT_SUBJ_SEN:
620 case AUDIT_SUBJ_CLR:
621 /* NOTE: this may return negative values indicating
622 a temporary error. We simply treat this as a
623 match for now to avoid losing information that
624 may be wanted. An error message will also be
625 logged upon error */
626 if (f->lsm_rule) {
627 if (need_sid) {
628 security_task_getsecid(tsk, &sid);
629 need_sid = 0;
630 }
631 result = security_audit_rule_match(sid, f->type,
632 f->op,
633 f->lsm_rule,
634 ctx);
635 }
636 break;
637 case AUDIT_OBJ_USER:
638 case AUDIT_OBJ_ROLE:
639 case AUDIT_OBJ_TYPE:
640 case AUDIT_OBJ_LEV_LOW:
641 case AUDIT_OBJ_LEV_HIGH:
642 /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
643 also applies here */
644 if (f->lsm_rule) {
645 /* Find files that match */
646 if (name) {
647 result = security_audit_rule_match(
648 name->osid, f->type, f->op,
649 f->lsm_rule, ctx);
650 } else if (ctx) {
651 list_for_each_entry(n, &ctx->names_list, list) {
652 if (security_audit_rule_match(n->osid, f->type,
653 f->op, f->lsm_rule,
654 ctx)) {
655 ++result;
656 break;
657 }
658 }
659 }
660 /* Find ipc objects that match */
661 if (!ctx || ctx->type != AUDIT_IPC)
662 break;
663 if (security_audit_rule_match(ctx->ipc.osid,
664 f->type, f->op,
665 f->lsm_rule, ctx))
666 ++result;
667 }
668 break;
669 case AUDIT_ARG0:
670 case AUDIT_ARG1:
671 case AUDIT_ARG2:
672 case AUDIT_ARG3:
673 if (ctx)
674 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
675 break;
676 case AUDIT_FILTERKEY:
677 /* ignore this field for filtering */
678 result = 1;
679 break;
680 case AUDIT_PERM:
681 result = audit_match_perm(ctx, f->val);
682 break;
683 case AUDIT_FILETYPE:
684 result = audit_match_filetype(ctx, f->val);
685 break;
686 case AUDIT_FIELD_COMPARE:
687 result = audit_field_compare(tsk, cred, f, ctx, name);
688 break;
689 }
690 if (!result)
691 return 0;
692 }
693
694 if (ctx) {
695 if (rule->prio <= ctx->prio)
696 return 0;
697 if (rule->filterkey) {
698 kfree(ctx->filterkey);
699 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
700 }
701 ctx->prio = rule->prio;
702 }
703 switch (rule->action) {
704 case AUDIT_NEVER:
705 *state = AUDIT_DISABLED;
706 break;
707 case AUDIT_ALWAYS:
708 *state = AUDIT_RECORD_CONTEXT;
709 break;
710 }
711 return 1;
712}
713
714/* At process creation time, we can determine if system-call auditing is
715 * completely disabled for this task. Since we only have the task
716 * structure at this point, we can only check uid and gid.
717 */
718static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
719{
720 struct audit_entry *e;
721 enum audit_state state;
722
723 rcu_read_lock();
724 list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
725 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
726 &state, true)) {
727 if (state == AUDIT_RECORD_CONTEXT)
728 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
729 rcu_read_unlock();
730 return state;
731 }
732 }
733 rcu_read_unlock();
734 return AUDIT_BUILD_CONTEXT;
735}
736
737static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
738{
739 int word, bit;
740
741 if (val > 0xffffffff)
742 return false;
743
744 word = AUDIT_WORD(val);
745 if (word >= AUDIT_BITMASK_SIZE)
746 return false;
747
748 bit = AUDIT_BIT(val);
749
750 return rule->mask[word] & bit;
751}
752
753/* At syscall entry and exit time, this filter is called if the
754 * audit_state is not low enough that auditing cannot take place, but is
755 * also not high enough that we already know we have to write an audit
756 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
757 */
758static enum audit_state audit_filter_syscall(struct task_struct *tsk,
759 struct audit_context *ctx,
760 struct list_head *list)
761{
762 struct audit_entry *e;
763 enum audit_state state;
764
765 if (auditd_test_task(tsk))
766 return AUDIT_DISABLED;
767
768 rcu_read_lock();
769 if (!list_empty(list)) {
770 list_for_each_entry_rcu(e, list, list) {
771 if (audit_in_mask(&e->rule, ctx->major) &&
772 audit_filter_rules(tsk, &e->rule, ctx, NULL,
773 &state, false)) {
774 rcu_read_unlock();
775 ctx->current_state = state;
776 return state;
777 }
778 }
779 }
780 rcu_read_unlock();
781 return AUDIT_BUILD_CONTEXT;
782}
783
784/*
785 * Given an audit_name check the inode hash table to see if they match.
786 * Called holding the rcu read lock to protect the use of audit_inode_hash
787 */
788static int audit_filter_inode_name(struct task_struct *tsk,
789 struct audit_names *n,
790 struct audit_context *ctx) {
791 int h = audit_hash_ino((u32)n->ino);
792 struct list_head *list = &audit_inode_hash[h];
793 struct audit_entry *e;
794 enum audit_state state;
795
796 if (list_empty(list))
797 return 0;
798
799 list_for_each_entry_rcu(e, list, list) {
800 if (audit_in_mask(&e->rule, ctx->major) &&
801 audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
802 ctx->current_state = state;
803 return 1;
804 }
805 }
806
807 return 0;
808}
809
810/* At syscall exit time, this filter is called if any audit_names have been
811 * collected during syscall processing. We only check rules in sublists at hash
812 * buckets applicable to the inode numbers in audit_names.
813 * Regarding audit_state, same rules apply as for audit_filter_syscall().
814 */
815void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
816{
817 struct audit_names *n;
818
819 if (auditd_test_task(tsk))
820 return;
821
822 rcu_read_lock();
823
824 list_for_each_entry(n, &ctx->names_list, list) {
825 if (audit_filter_inode_name(tsk, n, ctx))
826 break;
827 }
828 rcu_read_unlock();
829}
830
831/* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
832static inline struct audit_context *audit_take_context(struct task_struct *tsk,
833 int return_valid,
834 long return_code)
835{
836 struct audit_context *context = tsk->audit_context;
837
838 if (!context)
839 return NULL;
840 context->return_valid = return_valid;
841
842 /*
843 * we need to fix up the return code in the audit logs if the actual
844 * return codes are later going to be fixed up by the arch specific
845 * signal handlers
846 *
847 * This is actually a test for:
848 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
849 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
850 *
851 * but is faster than a bunch of ||
852 */
853 if (unlikely(return_code <= -ERESTARTSYS) &&
854 (return_code >= -ERESTART_RESTARTBLOCK) &&
855 (return_code != -ENOIOCTLCMD))
856 context->return_code = -EINTR;
857 else
858 context->return_code = return_code;
859
860 if (context->in_syscall && !context->dummy) {
861 audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
862 audit_filter_inodes(tsk, context);
863 }
864
865 tsk->audit_context = NULL;
866 return context;
867}
868
869static inline void audit_proctitle_free(struct audit_context *context)
870{
871 kfree(context->proctitle.value);
872 context->proctitle.value = NULL;
873 context->proctitle.len = 0;
874}
875
876static inline void audit_free_names(struct audit_context *context)
877{
878 struct audit_names *n, *next;
879
880 list_for_each_entry_safe(n, next, &context->names_list, list) {
881 list_del(&n->list);
882 if (n->name)
883 putname(n->name);
884 if (n->should_free)
885 kfree(n);
886 }
887 context->name_count = 0;
888 path_put(&context->pwd);
889 context->pwd.dentry = NULL;
890 context->pwd.mnt = NULL;
891}
892
893static inline void audit_free_aux(struct audit_context *context)
894{
895 struct audit_aux_data *aux;
896
897 while ((aux = context->aux)) {
898 context->aux = aux->next;
899 kfree(aux);
900 }
901 while ((aux = context->aux_pids)) {
902 context->aux_pids = aux->next;
903 kfree(aux);
904 }
905}
906
907static inline struct audit_context *audit_alloc_context(enum audit_state state)
908{
909 struct audit_context *context;
910
911 context = kzalloc(sizeof(*context), GFP_KERNEL);
912 if (!context)
913 return NULL;
914 context->state = state;
915 context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
916 INIT_LIST_HEAD(&context->killed_trees);
917 INIT_LIST_HEAD(&context->names_list);
918 return context;
919}
920
921/**
922 * audit_alloc - allocate an audit context block for a task
923 * @tsk: task
924 *
925 * Filter on the task information and allocate a per-task audit context
926 * if necessary. Doing so turns on system call auditing for the
927 * specified task. This is called from copy_process, so no lock is
928 * needed.
929 */
930int audit_alloc(struct task_struct *tsk)
931{
932 struct audit_context *context;
933 enum audit_state state;
934 char *key = NULL;
935
936 if (likely(!audit_ever_enabled))
937 return 0; /* Return if not auditing. */
938
939 state = audit_filter_task(tsk, &key);
940 if (state == AUDIT_DISABLED) {
941 clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
942 return 0;
943 }
944
945 if (!(context = audit_alloc_context(state))) {
946 kfree(key);
947 audit_log_lost("out of memory in audit_alloc");
948 return -ENOMEM;
949 }
950 context->filterkey = key;
951
952 tsk->audit_context = context;
953 set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
954 return 0;
955}
956
957static inline void audit_free_context(struct audit_context *context)
958{
959 audit_free_names(context);
960 unroll_tree_refs(context, NULL, 0);
961 free_tree_refs(context);
962 audit_free_aux(context);
963 kfree(context->filterkey);
964 kfree(context->sockaddr);
965 audit_proctitle_free(context);
966 kfree(context);
967}
968
969static int audit_log_pid_context(struct audit_context *context, pid_t pid,
970 kuid_t auid, kuid_t uid, unsigned int sessionid,
971 u32 sid, char *comm)
972{
973 struct audit_buffer *ab;
974 char *ctx = NULL;
975 u32 len;
976 int rc = 0;
977
978 ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
979 if (!ab)
980 return rc;
981
982 audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
983 from_kuid(&init_user_ns, auid),
984 from_kuid(&init_user_ns, uid), sessionid);
985 if (sid) {
986 if (security_secid_to_secctx(sid, &ctx, &len)) {
987 audit_log_format(ab, " obj=(none)");
988 rc = 1;
989 } else {
990 audit_log_format(ab, " obj=%s", ctx);
991 security_release_secctx(ctx, len);
992 }
993 }
994 audit_log_format(ab, " ocomm=");
995 audit_log_untrustedstring(ab, comm);
996 audit_log_end(ab);
997
998 return rc;
999}
1000
1001static void audit_log_execve_info(struct audit_context *context,
1002 struct audit_buffer **ab)
1003{
1004 long len_max;
1005 long len_rem;
1006 long len_full;
1007 long len_buf;
1008 long len_abuf = 0;
1009 long len_tmp;
1010 bool require_data;
1011 bool encode;
1012 unsigned int iter;
1013 unsigned int arg;
1014 char *buf_head;
1015 char *buf;
1016 const char __user *p = (const char __user *)current->mm->arg_start;
1017
1018 /* NOTE: this buffer needs to be large enough to hold all the non-arg
1019 * data we put in the audit record for this argument (see the
1020 * code below) ... at this point in time 96 is plenty */
1021 char abuf[96];
1022
1023 /* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
1024 * current value of 7500 is not as important as the fact that it
1025 * is less than 8k, a setting of 7500 gives us plenty of wiggle
1026 * room if we go over a little bit in the logging below */
1027 WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
1028 len_max = MAX_EXECVE_AUDIT_LEN;
1029
1030 /* scratch buffer to hold the userspace args */
1031 buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1032 if (!buf_head) {
1033 audit_panic("out of memory for argv string");
1034 return;
1035 }
1036 buf = buf_head;
1037
1038 audit_log_format(*ab, "argc=%d", context->execve.argc);
1039
1040 len_rem = len_max;
1041 len_buf = 0;
1042 len_full = 0;
1043 require_data = true;
1044 encode = false;
1045 iter = 0;
1046 arg = 0;
1047 do {
1048 /* NOTE: we don't ever want to trust this value for anything
1049 * serious, but the audit record format insists we
1050 * provide an argument length for really long arguments,
1051 * e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
1052 * to use strncpy_from_user() to obtain this value for
1053 * recording in the log, although we don't use it
1054 * anywhere here to avoid a double-fetch problem */
1055 if (len_full == 0)
1056 len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1057
1058 /* read more data from userspace */
1059 if (require_data) {
1060 /* can we make more room in the buffer? */
1061 if (buf != buf_head) {
1062 memmove(buf_head, buf, len_buf);
1063 buf = buf_head;
1064 }
1065
1066 /* fetch as much as we can of the argument */
1067 len_tmp = strncpy_from_user(&buf_head[len_buf], p,
1068 len_max - len_buf);
1069 if (len_tmp == -EFAULT) {
1070 /* unable to copy from userspace */
1071 send_sig(SIGKILL, current, 0);
1072 goto out;
1073 } else if (len_tmp == (len_max - len_buf)) {
1074 /* buffer is not large enough */
1075 require_data = true;
1076 /* NOTE: if we are going to span multiple
1077 * buffers force the encoding so we stand
1078 * a chance at a sane len_full value and
1079 * consistent record encoding */
1080 encode = true;
1081 len_full = len_full * 2;
1082 p += len_tmp;
1083 } else {
1084 require_data = false;
1085 if (!encode)
1086 encode = audit_string_contains_control(
1087 buf, len_tmp);
1088 /* try to use a trusted value for len_full */
1089 if (len_full < len_max)
1090 len_full = (encode ?
1091 len_tmp * 2 : len_tmp);
1092 p += len_tmp + 1;
1093 }
1094 len_buf += len_tmp;
1095 buf_head[len_buf] = '\0';
1096
1097 /* length of the buffer in the audit record? */
1098 len_abuf = (encode ? len_buf * 2 : len_buf + 2);
1099 }
1100
1101 /* write as much as we can to the audit log */
1102 if (len_buf > 0) {
1103 /* NOTE: some magic numbers here - basically if we
1104 * can't fit a reasonable amount of data into the
1105 * existing audit buffer, flush it and start with
1106 * a new buffer */
1107 if ((sizeof(abuf) + 8) > len_rem) {
1108 len_rem = len_max;
1109 audit_log_end(*ab);
1110 *ab = audit_log_start(context,
1111 GFP_KERNEL, AUDIT_EXECVE);
1112 if (!*ab)
1113 goto out;
1114 }
1115
1116 /* create the non-arg portion of the arg record */
1117 len_tmp = 0;
1118 if (require_data || (iter > 0) ||
1119 ((len_abuf + sizeof(abuf)) > len_rem)) {
1120 if (iter == 0) {
1121 len_tmp += snprintf(&abuf[len_tmp],
1122 sizeof(abuf) - len_tmp,
1123 " a%d_len=%lu",
1124 arg, len_full);
1125 }
1126 len_tmp += snprintf(&abuf[len_tmp],
1127 sizeof(abuf) - len_tmp,
1128 " a%d[%d]=", arg, iter++);
1129 } else
1130 len_tmp += snprintf(&abuf[len_tmp],
1131 sizeof(abuf) - len_tmp,
1132 " a%d=", arg);
1133 WARN_ON(len_tmp >= sizeof(abuf));
1134 abuf[sizeof(abuf) - 1] = '\0';
1135
1136 /* log the arg in the audit record */
1137 audit_log_format(*ab, "%s", abuf);
1138 len_rem -= len_tmp;
1139 len_tmp = len_buf;
1140 if (encode) {
1141 if (len_abuf > len_rem)
1142 len_tmp = len_rem / 2; /* encoding */
1143 audit_log_n_hex(*ab, buf, len_tmp);
1144 len_rem -= len_tmp * 2;
1145 len_abuf -= len_tmp * 2;
1146 } else {
1147 if (len_abuf > len_rem)
1148 len_tmp = len_rem - 2; /* quotes */
1149 audit_log_n_string(*ab, buf, len_tmp);
1150 len_rem -= len_tmp + 2;
1151 /* don't subtract the "2" because we still need
1152 * to add quotes to the remaining string */
1153 len_abuf -= len_tmp;
1154 }
1155 len_buf -= len_tmp;
1156 buf += len_tmp;
1157 }
1158
1159 /* ready to move to the next argument? */
1160 if ((len_buf == 0) && !require_data) {
1161 arg++;
1162 iter = 0;
1163 len_full = 0;
1164 require_data = true;
1165 encode = false;
1166 }
1167 } while (arg < context->execve.argc);
1168
1169 /* NOTE: the caller handles the final audit_log_end() call */
1170
1171out:
1172 kfree(buf_head);
1173}
1174
1175static void show_special(struct audit_context *context, int *call_panic)
1176{
1177 struct audit_buffer *ab;
1178 int i;
1179
1180 ab = audit_log_start(context, GFP_KERNEL, context->type);
1181 if (!ab)
1182 return;
1183
1184 switch (context->type) {
1185 case AUDIT_SOCKETCALL: {
1186 int nargs = context->socketcall.nargs;
1187 audit_log_format(ab, "nargs=%d", nargs);
1188 for (i = 0; i < nargs; i++)
1189 audit_log_format(ab, " a%d=%lx", i,
1190 context->socketcall.args[i]);
1191 break; }
1192 case AUDIT_IPC: {
1193 u32 osid = context->ipc.osid;
1194
1195 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1196 from_kuid(&init_user_ns, context->ipc.uid),
1197 from_kgid(&init_user_ns, context->ipc.gid),
1198 context->ipc.mode);
1199 if (osid) {
1200 char *ctx = NULL;
1201 u32 len;
1202 if (security_secid_to_secctx(osid, &ctx, &len)) {
1203 audit_log_format(ab, " osid=%u", osid);
1204 *call_panic = 1;
1205 } else {
1206 audit_log_format(ab, " obj=%s", ctx);
1207 security_release_secctx(ctx, len);
1208 }
1209 }
1210 if (context->ipc.has_perm) {
1211 audit_log_end(ab);
1212 ab = audit_log_start(context, GFP_KERNEL,
1213 AUDIT_IPC_SET_PERM);
1214 if (unlikely(!ab))
1215 return;
1216 audit_log_format(ab,
1217 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1218 context->ipc.qbytes,
1219 context->ipc.perm_uid,
1220 context->ipc.perm_gid,
1221 context->ipc.perm_mode);
1222 }
1223 break; }
1224 case AUDIT_MQ_OPEN: {
1225 audit_log_format(ab,
1226 "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1227 "mq_msgsize=%ld mq_curmsgs=%ld",
1228 context->mq_open.oflag, context->mq_open.mode,
1229 context->mq_open.attr.mq_flags,
1230 context->mq_open.attr.mq_maxmsg,
1231 context->mq_open.attr.mq_msgsize,
1232 context->mq_open.attr.mq_curmsgs);
1233 break; }
1234 case AUDIT_MQ_SENDRECV: {
1235 audit_log_format(ab,
1236 "mqdes=%d msg_len=%zd msg_prio=%u "
1237 "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
1238 context->mq_sendrecv.mqdes,
1239 context->mq_sendrecv.msg_len,
1240 context->mq_sendrecv.msg_prio,
1241 context->mq_sendrecv.abs_timeout.tv_sec,
1242 context->mq_sendrecv.abs_timeout.tv_nsec);
1243 break; }
1244 case AUDIT_MQ_NOTIFY: {
1245 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1246 context->mq_notify.mqdes,
1247 context->mq_notify.sigev_signo);
1248 break; }
1249 case AUDIT_MQ_GETSETATTR: {
1250 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1251 audit_log_format(ab,
1252 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1253 "mq_curmsgs=%ld ",
1254 context->mq_getsetattr.mqdes,
1255 attr->mq_flags, attr->mq_maxmsg,
1256 attr->mq_msgsize, attr->mq_curmsgs);
1257 break; }
1258 case AUDIT_CAPSET: {
1259 audit_log_format(ab, "pid=%d", context->capset.pid);
1260 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1261 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1262 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1263 break; }
1264 case AUDIT_MMAP: {
1265 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1266 context->mmap.flags);
1267 break; }
1268 case AUDIT_EXECVE: {
1269 audit_log_execve_info(context, &ab);
1270 break; }
1271 }
1272 audit_log_end(ab);
1273}
1274
1275static inline int audit_proctitle_rtrim(char *proctitle, int len)
1276{
1277 char *end = proctitle + len - 1;
1278 while (end > proctitle && !isprint(*end))
1279 end--;
1280
1281 /* catch the case where proctitle is only 1 non-print character */
1282 len = end - proctitle + 1;
1283 len -= isprint(proctitle[len-1]) == 0;
1284 return len;
1285}
1286
1287static void audit_log_proctitle(struct task_struct *tsk,
1288 struct audit_context *context)
1289{
1290 int res;
1291 char *buf;
1292 char *msg = "(null)";
1293 int len = strlen(msg);
1294 struct audit_buffer *ab;
1295
1296 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
1297 if (!ab)
1298 return; /* audit_panic or being filtered */
1299
1300 audit_log_format(ab, "proctitle=");
1301
1302 /* Not cached */
1303 if (!context->proctitle.value) {
1304 buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
1305 if (!buf)
1306 goto out;
1307 /* Historically called this from procfs naming */
1308 res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
1309 if (res == 0) {
1310 kfree(buf);
1311 goto out;
1312 }
1313 res = audit_proctitle_rtrim(buf, res);
1314 if (res == 0) {
1315 kfree(buf);
1316 goto out;
1317 }
1318 context->proctitle.value = buf;
1319 context->proctitle.len = res;
1320 }
1321 msg = context->proctitle.value;
1322 len = context->proctitle.len;
1323out:
1324 audit_log_n_untrustedstring(ab, msg, len);
1325 audit_log_end(ab);
1326}
1327
1328static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1329{
1330 int i, call_panic = 0;
1331 struct audit_buffer *ab;
1332 struct audit_aux_data *aux;
1333 struct audit_names *n;
1334
1335 /* tsk == current */
1336 context->personality = tsk->personality;
1337
1338 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1339 if (!ab)
1340 return; /* audit_panic has been called */
1341 audit_log_format(ab, "arch=%x syscall=%d",
1342 context->arch, context->major);
1343 if (context->personality != PER_LINUX)
1344 audit_log_format(ab, " per=%lx", context->personality);
1345 if (context->return_valid)
1346 audit_log_format(ab, " success=%s exit=%ld",
1347 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1348 context->return_code);
1349
1350 audit_log_format(ab,
1351 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1352 context->argv[0],
1353 context->argv[1],
1354 context->argv[2],
1355 context->argv[3],
1356 context->name_count);
1357
1358 audit_log_task_info(ab, tsk);
1359 audit_log_key(ab, context->filterkey);
1360 audit_log_end(ab);
1361
1362 for (aux = context->aux; aux; aux = aux->next) {
1363
1364 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1365 if (!ab)
1366 continue; /* audit_panic has been called */
1367
1368 switch (aux->type) {
1369
1370 case AUDIT_BPRM_FCAPS: {
1371 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1372 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1373 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1374 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1375 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1376 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1377 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1378 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1379 audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
1380 audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
1381 audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
1382 break; }
1383
1384 }
1385 audit_log_end(ab);
1386 }
1387
1388 if (context->type)
1389 show_special(context, &call_panic);
1390
1391 if (context->fds[0] >= 0) {
1392 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1393 if (ab) {
1394 audit_log_format(ab, "fd0=%d fd1=%d",
1395 context->fds[0], context->fds[1]);
1396 audit_log_end(ab);
1397 }
1398 }
1399
1400 if (context->sockaddr_len) {
1401 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1402 if (ab) {
1403 audit_log_format(ab, "saddr=");
1404 audit_log_n_hex(ab, (void *)context->sockaddr,
1405 context->sockaddr_len);
1406 audit_log_end(ab);
1407 }
1408 }
1409
1410 for (aux = context->aux_pids; aux; aux = aux->next) {
1411 struct audit_aux_data_pids *axs = (void *)aux;
1412
1413 for (i = 0; i < axs->pid_count; i++)
1414 if (audit_log_pid_context(context, axs->target_pid[i],
1415 axs->target_auid[i],
1416 axs->target_uid[i],
1417 axs->target_sessionid[i],
1418 axs->target_sid[i],
1419 axs->target_comm[i]))
1420 call_panic = 1;
1421 }
1422
1423 if (context->target_pid &&
1424 audit_log_pid_context(context, context->target_pid,
1425 context->target_auid, context->target_uid,
1426 context->target_sessionid,
1427 context->target_sid, context->target_comm))
1428 call_panic = 1;
1429
1430 if (context->pwd.dentry && context->pwd.mnt) {
1431 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1432 if (ab) {
1433 audit_log_d_path(ab, "cwd=", &context->pwd);
1434 audit_log_end(ab);
1435 }
1436 }
1437
1438 i = 0;
1439 list_for_each_entry(n, &context->names_list, list) {
1440 if (n->hidden)
1441 continue;
1442 audit_log_name(context, n, NULL, i++, &call_panic);
1443 }
1444
1445 audit_log_proctitle(tsk, context);
1446
1447 /* Send end of event record to help user space know we are finished */
1448 ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1449 if (ab)
1450 audit_log_end(ab);
1451 if (call_panic)
1452 audit_panic("error converting sid to string");
1453}
1454
1455/**
1456 * audit_free - free a per-task audit context
1457 * @tsk: task whose audit context block to free
1458 *
1459 * Called from copy_process and do_exit
1460 */
1461void __audit_free(struct task_struct *tsk)
1462{
1463 struct audit_context *context;
1464
1465 context = audit_take_context(tsk, 0, 0);
1466 if (!context)
1467 return;
1468
1469 /* Check for system calls that do not go through the exit
1470 * function (e.g., exit_group), then free context block.
1471 * We use GFP_ATOMIC here because we might be doing this
1472 * in the context of the idle thread */
1473 /* that can happen only if we are called from do_exit() */
1474 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1475 audit_log_exit(context, tsk);
1476 if (!list_empty(&context->killed_trees))
1477 audit_kill_trees(&context->killed_trees);
1478
1479 audit_free_context(context);
1480}
1481
1482/**
1483 * audit_syscall_entry - fill in an audit record at syscall entry
1484 * @major: major syscall type (function)
1485 * @a1: additional syscall register 1
1486 * @a2: additional syscall register 2
1487 * @a3: additional syscall register 3
1488 * @a4: additional syscall register 4
1489 *
1490 * Fill in audit context at syscall entry. This only happens if the
1491 * audit context was created when the task was created and the state or
1492 * filters demand the audit context be built. If the state from the
1493 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1494 * then the record will be written at syscall exit time (otherwise, it
1495 * will only be written if another part of the kernel requests that it
1496 * be written).
1497 */
1498void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
1499 unsigned long a3, unsigned long a4)
1500{
1501 struct task_struct *tsk = current;
1502 struct audit_context *context = tsk->audit_context;
1503 enum audit_state state;
1504
1505 if (!context)
1506 return;
1507
1508 BUG_ON(context->in_syscall || context->name_count);
1509
1510 if (!audit_enabled)
1511 return;
1512
1513 context->arch = syscall_get_arch();
1514 context->major = major;
1515 context->argv[0] = a1;
1516 context->argv[1] = a2;
1517 context->argv[2] = a3;
1518 context->argv[3] = a4;
1519
1520 state = context->state;
1521 context->dummy = !audit_n_rules;
1522 if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1523 context->prio = 0;
1524 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
1525 }
1526 if (state == AUDIT_DISABLED)
1527 return;
1528
1529 context->serial = 0;
1530 context->ctime = CURRENT_TIME;
1531 context->in_syscall = 1;
1532 context->current_state = state;
1533 context->ppid = 0;
1534}
1535
1536/**
1537 * audit_syscall_exit - deallocate audit context after a system call
1538 * @success: success value of the syscall
1539 * @return_code: return value of the syscall
1540 *
1541 * Tear down after system call. If the audit context has been marked as
1542 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1543 * filtering, or because some other part of the kernel wrote an audit
1544 * message), then write out the syscall information. In call cases,
1545 * free the names stored from getname().
1546 */
1547void __audit_syscall_exit(int success, long return_code)
1548{
1549 struct task_struct *tsk = current;
1550 struct audit_context *context;
1551
1552 if (success)
1553 success = AUDITSC_SUCCESS;
1554 else
1555 success = AUDITSC_FAILURE;
1556
1557 context = audit_take_context(tsk, success, return_code);
1558 if (!context)
1559 return;
1560
1561 if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1562 audit_log_exit(context, tsk);
1563
1564 context->in_syscall = 0;
1565 context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
1566
1567 if (!list_empty(&context->killed_trees))
1568 audit_kill_trees(&context->killed_trees);
1569
1570 audit_free_names(context);
1571 unroll_tree_refs(context, NULL, 0);
1572 audit_free_aux(context);
1573 context->aux = NULL;
1574 context->aux_pids = NULL;
1575 context->target_pid = 0;
1576 context->target_sid = 0;
1577 context->sockaddr_len = 0;
1578 context->type = 0;
1579 context->fds[0] = -1;
1580 if (context->state != AUDIT_RECORD_CONTEXT) {
1581 kfree(context->filterkey);
1582 context->filterkey = NULL;
1583 }
1584 tsk->audit_context = context;
1585}
1586
1587static inline void handle_one(const struct inode *inode)
1588{
1589#ifdef CONFIG_AUDIT_TREE
1590 struct audit_context *context;
1591 struct audit_tree_refs *p;
1592 struct audit_chunk *chunk;
1593 int count;
1594 if (likely(hlist_empty(&inode->i_fsnotify_marks)))
1595 return;
1596 context = current->audit_context;
1597 p = context->trees;
1598 count = context->tree_count;
1599 rcu_read_lock();
1600 chunk = audit_tree_lookup(inode);
1601 rcu_read_unlock();
1602 if (!chunk)
1603 return;
1604 if (likely(put_tree_ref(context, chunk)))
1605 return;
1606 if (unlikely(!grow_tree_refs(context))) {
1607 pr_warn("out of memory, audit has lost a tree reference\n");
1608 audit_set_auditable(context);
1609 audit_put_chunk(chunk);
1610 unroll_tree_refs(context, p, count);
1611 return;
1612 }
1613 put_tree_ref(context, chunk);
1614#endif
1615}
1616
1617static void handle_path(const struct dentry *dentry)
1618{
1619#ifdef CONFIG_AUDIT_TREE
1620 struct audit_context *context;
1621 struct audit_tree_refs *p;
1622 const struct dentry *d, *parent;
1623 struct audit_chunk *drop;
1624 unsigned long seq;
1625 int count;
1626
1627 context = current->audit_context;
1628 p = context->trees;
1629 count = context->tree_count;
1630retry:
1631 drop = NULL;
1632 d = dentry;
1633 rcu_read_lock();
1634 seq = read_seqbegin(&rename_lock);
1635 for(;;) {
1636 struct inode *inode = d_backing_inode(d);
1637 if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
1638 struct audit_chunk *chunk;
1639 chunk = audit_tree_lookup(inode);
1640 if (chunk) {
1641 if (unlikely(!put_tree_ref(context, chunk))) {
1642 drop = chunk;
1643 break;
1644 }
1645 }
1646 }
1647 parent = d->d_parent;
1648 if (parent == d)
1649 break;
1650 d = parent;
1651 }
1652 if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
1653 rcu_read_unlock();
1654 if (!drop) {
1655 /* just a race with rename */
1656 unroll_tree_refs(context, p, count);
1657 goto retry;
1658 }
1659 audit_put_chunk(drop);
1660 if (grow_tree_refs(context)) {
1661 /* OK, got more space */
1662 unroll_tree_refs(context, p, count);
1663 goto retry;
1664 }
1665 /* too bad */
1666 pr_warn("out of memory, audit has lost a tree reference\n");
1667 unroll_tree_refs(context, p, count);
1668 audit_set_auditable(context);
1669 return;
1670 }
1671 rcu_read_unlock();
1672#endif
1673}
1674
1675static struct audit_names *audit_alloc_name(struct audit_context *context,
1676 unsigned char type)
1677{
1678 struct audit_names *aname;
1679
1680 if (context->name_count < AUDIT_NAMES) {
1681 aname = &context->preallocated_names[context->name_count];
1682 memset(aname, 0, sizeof(*aname));
1683 } else {
1684 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1685 if (!aname)
1686 return NULL;
1687 aname->should_free = true;
1688 }
1689
1690 aname->ino = AUDIT_INO_UNSET;
1691 aname->type = type;
1692 list_add_tail(&aname->list, &context->names_list);
1693
1694 context->name_count++;
1695 return aname;
1696}
1697
1698/**
1699 * audit_reusename - fill out filename with info from existing entry
1700 * @uptr: userland ptr to pathname
1701 *
1702 * Search the audit_names list for the current audit context. If there is an
1703 * existing entry with a matching "uptr" then return the filename
1704 * associated with that audit_name. If not, return NULL.
1705 */
1706struct filename *
1707__audit_reusename(const __user char *uptr)
1708{
1709 struct audit_context *context = current->audit_context;
1710 struct audit_names *n;
1711
1712 list_for_each_entry(n, &context->names_list, list) {
1713 if (!n->name)
1714 continue;
1715 if (n->name->uptr == uptr) {
1716 n->name->refcnt++;
1717 return n->name;
1718 }
1719 }
1720 return NULL;
1721}
1722
1723/**
1724 * audit_getname - add a name to the list
1725 * @name: name to add
1726 *
1727 * Add a name to the list of audit names for this context.
1728 * Called from fs/namei.c:getname().
1729 */
1730void __audit_getname(struct filename *name)
1731{
1732 struct audit_context *context = current->audit_context;
1733 struct audit_names *n;
1734
1735 if (!context->in_syscall)
1736 return;
1737
1738 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1739 if (!n)
1740 return;
1741
1742 n->name = name;
1743 n->name_len = AUDIT_NAME_FULL;
1744 name->aname = n;
1745 name->refcnt++;
1746
1747 if (!context->pwd.dentry)
1748 get_fs_pwd(current->fs, &context->pwd);
1749}
1750
1751/**
1752 * __audit_inode - store the inode and device from a lookup
1753 * @name: name being audited
1754 * @dentry: dentry being audited
1755 * @flags: attributes for this particular entry
1756 */
1757void __audit_inode(struct filename *name, const struct dentry *dentry,
1758 unsigned int flags)
1759{
1760 struct audit_context *context = current->audit_context;
1761 struct inode *inode = d_backing_inode(dentry);
1762 struct audit_names *n;
1763 bool parent = flags & AUDIT_INODE_PARENT;
1764
1765 if (!context->in_syscall)
1766 return;
1767
1768 if (!name)
1769 goto out_alloc;
1770
1771 /*
1772 * If we have a pointer to an audit_names entry already, then we can
1773 * just use it directly if the type is correct.
1774 */
1775 n = name->aname;
1776 if (n) {
1777 if (parent) {
1778 if (n->type == AUDIT_TYPE_PARENT ||
1779 n->type == AUDIT_TYPE_UNKNOWN)
1780 goto out;
1781 } else {
1782 if (n->type != AUDIT_TYPE_PARENT)
1783 goto out;
1784 }
1785 }
1786
1787 list_for_each_entry_reverse(n, &context->names_list, list) {
1788 if (n->ino) {
1789 /* valid inode number, use that for the comparison */
1790 if (n->ino != inode->i_ino ||
1791 n->dev != inode->i_sb->s_dev)
1792 continue;
1793 } else if (n->name) {
1794 /* inode number has not been set, check the name */
1795 if (strcmp(n->name->name, name->name))
1796 continue;
1797 } else
1798 /* no inode and no name (?!) ... this is odd ... */
1799 continue;
1800
1801 /* match the correct record type */
1802 if (parent) {
1803 if (n->type == AUDIT_TYPE_PARENT ||
1804 n->type == AUDIT_TYPE_UNKNOWN)
1805 goto out;
1806 } else {
1807 if (n->type != AUDIT_TYPE_PARENT)
1808 goto out;
1809 }
1810 }
1811
1812out_alloc:
1813 /* unable to find an entry with both a matching name and type */
1814 n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1815 if (!n)
1816 return;
1817 if (name) {
1818 n->name = name;
1819 name->refcnt++;
1820 }
1821
1822out:
1823 if (parent) {
1824 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
1825 n->type = AUDIT_TYPE_PARENT;
1826 if (flags & AUDIT_INODE_HIDDEN)
1827 n->hidden = true;
1828 } else {
1829 n->name_len = AUDIT_NAME_FULL;
1830 n->type = AUDIT_TYPE_NORMAL;
1831 }
1832 handle_path(dentry);
1833 audit_copy_inode(n, dentry, inode);
1834}
1835
1836void __audit_file(const struct file *file)
1837{
1838 __audit_inode(NULL, file->f_path.dentry, 0);
1839}
1840
1841/**
1842 * __audit_inode_child - collect inode info for created/removed objects
1843 * @parent: inode of dentry parent
1844 * @dentry: dentry being audited
1845 * @type: AUDIT_TYPE_* value that we're looking for
1846 *
1847 * For syscalls that create or remove filesystem objects, audit_inode
1848 * can only collect information for the filesystem object's parent.
1849 * This call updates the audit context with the child's information.
1850 * Syscalls that create a new filesystem object must be hooked after
1851 * the object is created. Syscalls that remove a filesystem object
1852 * must be hooked prior, in order to capture the target inode during
1853 * unsuccessful attempts.
1854 */
1855void __audit_inode_child(struct inode *parent,
1856 const struct dentry *dentry,
1857 const unsigned char type)
1858{
1859 struct audit_context *context = current->audit_context;
1860 struct inode *inode = d_backing_inode(dentry);
1861 const char *dname = dentry->d_name.name;
1862 struct audit_names *n, *found_parent = NULL, *found_child = NULL;
1863
1864 if (!context->in_syscall)
1865 return;
1866
1867 if (inode)
1868 handle_one(inode);
1869
1870 /* look for a parent entry first */
1871 list_for_each_entry(n, &context->names_list, list) {
1872 if (!n->name ||
1873 (n->type != AUDIT_TYPE_PARENT &&
1874 n->type != AUDIT_TYPE_UNKNOWN))
1875 continue;
1876
1877 if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
1878 !audit_compare_dname_path(dname,
1879 n->name->name, n->name_len)) {
1880 if (n->type == AUDIT_TYPE_UNKNOWN)
1881 n->type = AUDIT_TYPE_PARENT;
1882 found_parent = n;
1883 break;
1884 }
1885 }
1886
1887 /* is there a matching child entry? */
1888 list_for_each_entry(n, &context->names_list, list) {
1889 /* can only match entries that have a name */
1890 if (!n->name ||
1891 (n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
1892 continue;
1893
1894 if (!strcmp(dname, n->name->name) ||
1895 !audit_compare_dname_path(dname, n->name->name,
1896 found_parent ?
1897 found_parent->name_len :
1898 AUDIT_NAME_FULL)) {
1899 if (n->type == AUDIT_TYPE_UNKNOWN)
1900 n->type = type;
1901 found_child = n;
1902 break;
1903 }
1904 }
1905
1906 if (!found_parent) {
1907 /* create a new, "anonymous" parent record */
1908 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
1909 if (!n)
1910 return;
1911 audit_copy_inode(n, NULL, parent);
1912 }
1913
1914 if (!found_child) {
1915 found_child = audit_alloc_name(context, type);
1916 if (!found_child)
1917 return;
1918
1919 /* Re-use the name belonging to the slot for a matching parent
1920 * directory. All names for this context are relinquished in
1921 * audit_free_names() */
1922 if (found_parent) {
1923 found_child->name = found_parent->name;
1924 found_child->name_len = AUDIT_NAME_FULL;
1925 found_child->name->refcnt++;
1926 }
1927 }
1928
1929 if (inode)
1930 audit_copy_inode(found_child, dentry, inode);
1931 else
1932 found_child->ino = AUDIT_INO_UNSET;
1933}
1934EXPORT_SYMBOL_GPL(__audit_inode_child);
1935
1936/**
1937 * auditsc_get_stamp - get local copies of audit_context values
1938 * @ctx: audit_context for the task
1939 * @t: timespec to store time recorded in the audit_context
1940 * @serial: serial value that is recorded in the audit_context
1941 *
1942 * Also sets the context as auditable.
1943 */
1944int auditsc_get_stamp(struct audit_context *ctx,
1945 struct timespec *t, unsigned int *serial)
1946{
1947 if (!ctx->in_syscall)
1948 return 0;
1949 if (!ctx->serial)
1950 ctx->serial = audit_serial();
1951 t->tv_sec = ctx->ctime.tv_sec;
1952 t->tv_nsec = ctx->ctime.tv_nsec;
1953 *serial = ctx->serial;
1954 if (!ctx->prio) {
1955 ctx->prio = 1;
1956 ctx->current_state = AUDIT_RECORD_CONTEXT;
1957 }
1958 return 1;
1959}
1960
1961/* global counter which is incremented every time something logs in */
1962static atomic_t session_id = ATOMIC_INIT(0);
1963
1964static int audit_set_loginuid_perm(kuid_t loginuid)
1965{
1966 /* if we are unset, we don't need privs */
1967 if (!audit_loginuid_set(current))
1968 return 0;
1969 /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
1970 if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
1971 return -EPERM;
1972 /* it is set, you need permission */
1973 if (!capable(CAP_AUDIT_CONTROL))
1974 return -EPERM;
1975 /* reject if this is not an unset and we don't allow that */
1976 if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
1977 return -EPERM;
1978 return 0;
1979}
1980
1981static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
1982 unsigned int oldsessionid, unsigned int sessionid,
1983 int rc)
1984{
1985 struct audit_buffer *ab;
1986 uid_t uid, oldloginuid, loginuid;
1987 struct tty_struct *tty;
1988
1989 if (!audit_enabled)
1990 return;
1991
1992 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1993 if (!ab)
1994 return;
1995
1996 uid = from_kuid(&init_user_ns, task_uid(current));
1997 oldloginuid = from_kuid(&init_user_ns, koldloginuid);
1998 loginuid = from_kuid(&init_user_ns, kloginuid),
1999 tty = audit_get_tty(current);
2000
2001 audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
2002 audit_log_task_context(ab);
2003 audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
2004 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
2005 oldsessionid, sessionid, !rc);
2006 audit_put_tty(tty);
2007 audit_log_end(ab);
2008}
2009
2010/**
2011 * audit_set_loginuid - set current task's audit_context loginuid
2012 * @loginuid: loginuid value
2013 *
2014 * Returns 0.
2015 *
2016 * Called (set) from fs/proc/base.c::proc_loginuid_write().
2017 */
2018int audit_set_loginuid(kuid_t loginuid)
2019{
2020 struct task_struct *task = current;
2021 unsigned int oldsessionid, sessionid = (unsigned int)-1;
2022 kuid_t oldloginuid;
2023 int rc;
2024
2025 oldloginuid = audit_get_loginuid(current);
2026 oldsessionid = audit_get_sessionid(current);
2027
2028 rc = audit_set_loginuid_perm(loginuid);
2029 if (rc)
2030 goto out;
2031
2032 /* are we setting or clearing? */
2033 if (uid_valid(loginuid)) {
2034 sessionid = (unsigned int)atomic_inc_return(&session_id);
2035 if (unlikely(sessionid == (unsigned int)-1))
2036 sessionid = (unsigned int)atomic_inc_return(&session_id);
2037 }
2038
2039 task->sessionid = sessionid;
2040 task->loginuid = loginuid;
2041out:
2042 audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2043 return rc;
2044}
2045
2046/**
2047 * __audit_mq_open - record audit data for a POSIX MQ open
2048 * @oflag: open flag
2049 * @mode: mode bits
2050 * @attr: queue attributes
2051 *
2052 */
2053void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2054{
2055 struct audit_context *context = current->audit_context;
2056
2057 if (attr)
2058 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2059 else
2060 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2061
2062 context->mq_open.oflag = oflag;
2063 context->mq_open.mode = mode;
2064
2065 context->type = AUDIT_MQ_OPEN;
2066}
2067
2068/**
2069 * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2070 * @mqdes: MQ descriptor
2071 * @msg_len: Message length
2072 * @msg_prio: Message priority
2073 * @abs_timeout: Message timeout in absolute time
2074 *
2075 */
2076void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2077 const struct timespec *abs_timeout)
2078{
2079 struct audit_context *context = current->audit_context;
2080 struct timespec *p = &context->mq_sendrecv.abs_timeout;
2081
2082 if (abs_timeout)
2083 memcpy(p, abs_timeout, sizeof(struct timespec));
2084 else
2085 memset(p, 0, sizeof(struct timespec));
2086
2087 context->mq_sendrecv.mqdes = mqdes;
2088 context->mq_sendrecv.msg_len = msg_len;
2089 context->mq_sendrecv.msg_prio = msg_prio;
2090
2091 context->type = AUDIT_MQ_SENDRECV;
2092}
2093
2094/**
2095 * __audit_mq_notify - record audit data for a POSIX MQ notify
2096 * @mqdes: MQ descriptor
2097 * @notification: Notification event
2098 *
2099 */
2100
2101void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2102{
2103 struct audit_context *context = current->audit_context;
2104
2105 if (notification)
2106 context->mq_notify.sigev_signo = notification->sigev_signo;
2107 else
2108 context->mq_notify.sigev_signo = 0;
2109
2110 context->mq_notify.mqdes = mqdes;
2111 context->type = AUDIT_MQ_NOTIFY;
2112}
2113
2114/**
2115 * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2116 * @mqdes: MQ descriptor
2117 * @mqstat: MQ flags
2118 *
2119 */
2120void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2121{
2122 struct audit_context *context = current->audit_context;
2123 context->mq_getsetattr.mqdes = mqdes;
2124 context->mq_getsetattr.mqstat = *mqstat;
2125 context->type = AUDIT_MQ_GETSETATTR;
2126}
2127
2128/**
2129 * audit_ipc_obj - record audit data for ipc object
2130 * @ipcp: ipc permissions
2131 *
2132 */
2133void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2134{
2135 struct audit_context *context = current->audit_context;
2136 context->ipc.uid = ipcp->uid;
2137 context->ipc.gid = ipcp->gid;
2138 context->ipc.mode = ipcp->mode;
2139 context->ipc.has_perm = 0;
2140 security_ipc_getsecid(ipcp, &context->ipc.osid);
2141 context->type = AUDIT_IPC;
2142}
2143
2144/**
2145 * audit_ipc_set_perm - record audit data for new ipc permissions
2146 * @qbytes: msgq bytes
2147 * @uid: msgq user id
2148 * @gid: msgq group id
2149 * @mode: msgq mode (permissions)
2150 *
2151 * Called only after audit_ipc_obj().
2152 */
2153void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2154{
2155 struct audit_context *context = current->audit_context;
2156
2157 context->ipc.qbytes = qbytes;
2158 context->ipc.perm_uid = uid;
2159 context->ipc.perm_gid = gid;
2160 context->ipc.perm_mode = mode;
2161 context->ipc.has_perm = 1;
2162}
2163
2164void __audit_bprm(struct linux_binprm *bprm)
2165{
2166 struct audit_context *context = current->audit_context;
2167
2168 context->type = AUDIT_EXECVE;
2169 context->execve.argc = bprm->argc;
2170}
2171
2172
2173/**
2174 * audit_socketcall - record audit data for sys_socketcall
2175 * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2176 * @args: args array
2177 *
2178 */
2179int __audit_socketcall(int nargs, unsigned long *args)
2180{
2181 struct audit_context *context = current->audit_context;
2182
2183 if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2184 return -EINVAL;
2185 context->type = AUDIT_SOCKETCALL;
2186 context->socketcall.nargs = nargs;
2187 memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2188 return 0;
2189}
2190
2191/**
2192 * __audit_fd_pair - record audit data for pipe and socketpair
2193 * @fd1: the first file descriptor
2194 * @fd2: the second file descriptor
2195 *
2196 */
2197void __audit_fd_pair(int fd1, int fd2)
2198{
2199 struct audit_context *context = current->audit_context;
2200 context->fds[0] = fd1;
2201 context->fds[1] = fd2;
2202}
2203
2204/**
2205 * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2206 * @len: data length in user space
2207 * @a: data address in kernel space
2208 *
2209 * Returns 0 for success or NULL context or < 0 on error.
2210 */
2211int __audit_sockaddr(int len, void *a)
2212{
2213 struct audit_context *context = current->audit_context;
2214
2215 if (!context->sockaddr) {
2216 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2217 if (!p)
2218 return -ENOMEM;
2219 context->sockaddr = p;
2220 }
2221
2222 context->sockaddr_len = len;
2223 memcpy(context->sockaddr, a, len);
2224 return 0;
2225}
2226
2227void __audit_ptrace(struct task_struct *t)
2228{
2229 struct audit_context *context = current->audit_context;
2230
2231 context->target_pid = task_tgid_nr(t);
2232 context->target_auid = audit_get_loginuid(t);
2233 context->target_uid = task_uid(t);
2234 context->target_sessionid = audit_get_sessionid(t);
2235 security_task_getsecid(t, &context->target_sid);
2236 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2237}
2238
2239/**
2240 * audit_signal_info - record signal info for shutting down audit subsystem
2241 * @sig: signal value
2242 * @t: task being signaled
2243 *
2244 * If the audit subsystem is being terminated, record the task (pid)
2245 * and uid that is doing that.
2246 */
2247int __audit_signal_info(int sig, struct task_struct *t)
2248{
2249 struct audit_aux_data_pids *axp;
2250 struct task_struct *tsk = current;
2251 struct audit_context *ctx = tsk->audit_context;
2252 kuid_t uid = current_uid(), t_uid = task_uid(t);
2253
2254 if (auditd_test_task(t)) {
2255 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
2256 audit_sig_pid = task_tgid_nr(tsk);
2257 if (uid_valid(tsk->loginuid))
2258 audit_sig_uid = tsk->loginuid;
2259 else
2260 audit_sig_uid = uid;
2261 security_task_getsecid(tsk, &audit_sig_sid);
2262 }
2263 if (!audit_signals || audit_dummy_context())
2264 return 0;
2265 }
2266
2267 /* optimize the common case by putting first signal recipient directly
2268 * in audit_context */
2269 if (!ctx->target_pid) {
2270 ctx->target_pid = task_tgid_nr(t);
2271 ctx->target_auid = audit_get_loginuid(t);
2272 ctx->target_uid = t_uid;
2273 ctx->target_sessionid = audit_get_sessionid(t);
2274 security_task_getsecid(t, &ctx->target_sid);
2275 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2276 return 0;
2277 }
2278
2279 axp = (void *)ctx->aux_pids;
2280 if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2281 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2282 if (!axp)
2283 return -ENOMEM;
2284
2285 axp->d.type = AUDIT_OBJ_PID;
2286 axp->d.next = ctx->aux_pids;
2287 ctx->aux_pids = (void *)axp;
2288 }
2289 BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2290
2291 axp->target_pid[axp->pid_count] = task_tgid_nr(t);
2292 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2293 axp->target_uid[axp->pid_count] = t_uid;
2294 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2295 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2296 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2297 axp->pid_count++;
2298
2299 return 0;
2300}
2301
2302/**
2303 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2304 * @bprm: pointer to the bprm being processed
2305 * @new: the proposed new credentials
2306 * @old: the old credentials
2307 *
2308 * Simply check if the proc already has the caps given by the file and if not
2309 * store the priv escalation info for later auditing at the end of the syscall
2310 *
2311 * -Eric
2312 */
2313int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2314 const struct cred *new, const struct cred *old)
2315{
2316 struct audit_aux_data_bprm_fcaps *ax;
2317 struct audit_context *context = current->audit_context;
2318 struct cpu_vfs_cap_data vcaps;
2319
2320 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2321 if (!ax)
2322 return -ENOMEM;
2323
2324 ax->d.type = AUDIT_BPRM_FCAPS;
2325 ax->d.next = context->aux;
2326 context->aux = (void *)ax;
2327
2328 get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
2329
2330 ax->fcap.permitted = vcaps.permitted;
2331 ax->fcap.inheritable = vcaps.inheritable;
2332 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2333 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2334
2335 ax->old_pcap.permitted = old->cap_permitted;
2336 ax->old_pcap.inheritable = old->cap_inheritable;
2337 ax->old_pcap.effective = old->cap_effective;
2338
2339 ax->new_pcap.permitted = new->cap_permitted;
2340 ax->new_pcap.inheritable = new->cap_inheritable;
2341 ax->new_pcap.effective = new->cap_effective;
2342 return 0;
2343}
2344
2345/**
2346 * __audit_log_capset - store information about the arguments to the capset syscall
2347 * @new: the new credentials
2348 * @old: the old (current) credentials
2349 *
2350 * Record the arguments userspace sent to sys_capset for later printing by the
2351 * audit system if applicable
2352 */
2353void __audit_log_capset(const struct cred *new, const struct cred *old)
2354{
2355 struct audit_context *context = current->audit_context;
2356 context->capset.pid = task_tgid_nr(current);
2357 context->capset.cap.effective = new->cap_effective;
2358 context->capset.cap.inheritable = new->cap_effective;
2359 context->capset.cap.permitted = new->cap_permitted;
2360 context->type = AUDIT_CAPSET;
2361}
2362
2363void __audit_mmap_fd(int fd, int flags)
2364{
2365 struct audit_context *context = current->audit_context;
2366 context->mmap.fd = fd;
2367 context->mmap.flags = flags;
2368 context->type = AUDIT_MMAP;
2369}
2370
2371static void audit_log_task(struct audit_buffer *ab)
2372{
2373 kuid_t auid, uid;
2374 kgid_t gid;
2375 unsigned int sessionid;
2376 char comm[sizeof(current->comm)];
2377
2378 auid = audit_get_loginuid(current);
2379 sessionid = audit_get_sessionid(current);
2380 current_uid_gid(&uid, &gid);
2381
2382 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2383 from_kuid(&init_user_ns, auid),
2384 from_kuid(&init_user_ns, uid),
2385 from_kgid(&init_user_ns, gid),
2386 sessionid);
2387 audit_log_task_context(ab);
2388 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
2389 audit_log_untrustedstring(ab, get_task_comm(comm, current));
2390 audit_log_d_path_exe(ab, current->mm);
2391}
2392
2393/**
2394 * audit_core_dumps - record information about processes that end abnormally
2395 * @signr: signal value
2396 *
2397 * If a process ends with a core dump, something fishy is going on and we
2398 * should record the event for investigation.
2399 */
2400void audit_core_dumps(long signr)
2401{
2402 struct audit_buffer *ab;
2403
2404 if (!audit_enabled)
2405 return;
2406
2407 if (signr == SIGQUIT) /* don't care for those */
2408 return;
2409
2410 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
2411 if (unlikely(!ab))
2412 return;
2413 audit_log_task(ab);
2414 audit_log_format(ab, " sig=%ld", signr);
2415 audit_log_end(ab);
2416}
2417
2418void __audit_seccomp(unsigned long syscall, long signr, int code)
2419{
2420 struct audit_buffer *ab;
2421
2422 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
2423 if (unlikely(!ab))
2424 return;
2425 audit_log_task(ab);
2426 audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
2427 signr, syscall_get_arch(), syscall,
2428 in_compat_syscall(), KSTK_EIP(current), code);
2429 audit_log_end(ab);
2430}
2431
2432struct list_head *audit_killed_trees(void)
2433{
2434 struct audit_context *ctx = current->audit_context;
2435 if (likely(!ctx || !ctx->in_syscall))
2436 return NULL;
2437 return &ctx->killed_trees;
2438}