1 /* auditsc.c -- System-call auditing support
2 * Handles all system-call specific auditing features.
4 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright (C) 2005 IBM Corporation
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.
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.
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
23 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
25 * Many of the ideas implemented here are from Stephen C. Tweedie,
26 * especially the idea of avoiding a copy by using getname.
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.
32 * The support of additional filter rules compares (>, <, >=, <=) was
33 * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
35 * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
36 * filesystem information.
38 * Subject and object context labeling support added by <danjones@us.ibm.com>
39 * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
42 #include <linux/init.h>
43 #include <asm/types.h>
44 #include <asm/atomic.h>
45 #include <asm/types.h>
47 #include <linux/namei.h>
49 #include <linux/module.h>
50 #include <linux/mount.h>
51 #include <linux/socket.h>
52 #include <linux/audit.h>
53 #include <linux/personality.h>
54 #include <linux/time.h>
55 #include <linux/netlink.h>
56 #include <linux/compiler.h>
57 #include <asm/unistd.h>
58 #include <linux/security.h>
59 #include <linux/list.h>
60 #include <linux/tty.h>
61 #include <linux/selinux.h>
62 #include <linux/binfmts.h>
63 #include <linux/syscalls.h>
67 extern struct list_head audit_filter_list
[];
69 /* No syscall auditing will take place unless audit_enabled != 0. */
70 extern int audit_enabled
;
72 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
73 * for saving names from getname(). */
74 #define AUDIT_NAMES 20
76 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
77 * audit_context from being used for nameless inodes from
79 #define AUDIT_NAMES_RESERVED 7
81 /* When fs/namei.c:getname() is called, we store the pointer in name and
82 * we don't let putname() free it (instead we free all of the saved
83 * pointers at syscall exit time).
85 * Further, in fs/namei.c:path_lookup() we store the inode and device. */
98 struct audit_aux_data
{
99 struct audit_aux_data
*next
;
103 #define AUDIT_AUX_IPCPERM 0
105 struct audit_aux_data_ipcctl
{
106 struct audit_aux_data d
;
108 unsigned long qbytes
;
115 struct audit_aux_data_execve
{
116 struct audit_aux_data d
;
122 struct audit_aux_data_socketcall
{
123 struct audit_aux_data d
;
125 unsigned long args
[0];
128 struct audit_aux_data_sockaddr
{
129 struct audit_aux_data d
;
134 struct audit_aux_data_path
{
135 struct audit_aux_data d
;
136 struct dentry
*dentry
;
137 struct vfsmount
*mnt
;
140 /* The per-task audit context. */
141 struct audit_context
{
142 int in_syscall
; /* 1 if task is in a syscall */
143 enum audit_state state
;
144 unsigned int serial
; /* serial number for record */
145 struct timespec ctime
; /* time of syscall entry */
146 uid_t loginuid
; /* login uid (identity) */
147 int major
; /* syscall number */
148 unsigned long argv
[4]; /* syscall arguments */
149 int return_valid
; /* return code is valid */
150 long return_code
;/* syscall return code */
151 int auditable
; /* 1 if record should be written */
153 struct audit_names names
[AUDIT_NAMES
];
155 struct vfsmount
* pwdmnt
;
156 struct audit_context
*previous
; /* For nested syscalls */
157 struct audit_aux_data
*aux
;
159 /* Save things to print about task_struct */
161 uid_t uid
, euid
, suid
, fsuid
;
162 gid_t gid
, egid
, sgid
, fsgid
;
163 unsigned long personality
;
173 /* Compare a task_struct with an audit_rule. Return 1 on match, 0
175 static int audit_filter_rules(struct task_struct
*tsk
,
176 struct audit_krule
*rule
,
177 struct audit_context
*ctx
,
178 enum audit_state
*state
)
180 int i
, j
, need_sid
= 1;
183 for (i
= 0; i
< rule
->field_count
; i
++) {
184 struct audit_field
*f
= &rule
->fields
[i
];
189 result
= audit_comparator(tsk
->pid
, f
->op
, f
->val
);
193 result
= audit_comparator(ctx
->ppid
, f
->op
, f
->val
);
196 result
= audit_comparator(tsk
->uid
, f
->op
, f
->val
);
199 result
= audit_comparator(tsk
->euid
, f
->op
, f
->val
);
202 result
= audit_comparator(tsk
->suid
, f
->op
, f
->val
);
205 result
= audit_comparator(tsk
->fsuid
, f
->op
, f
->val
);
208 result
= audit_comparator(tsk
->gid
, f
->op
, f
->val
);
211 result
= audit_comparator(tsk
->egid
, f
->op
, f
->val
);
214 result
= audit_comparator(tsk
->sgid
, f
->op
, f
->val
);
217 result
= audit_comparator(tsk
->fsgid
, f
->op
, f
->val
);
220 result
= audit_comparator(tsk
->personality
, f
->op
, f
->val
);
224 result
= audit_comparator(ctx
->arch
, f
->op
, f
->val
);
228 if (ctx
&& ctx
->return_valid
)
229 result
= audit_comparator(ctx
->return_code
, f
->op
, f
->val
);
232 if (ctx
&& ctx
->return_valid
) {
234 result
= audit_comparator(ctx
->return_valid
, f
->op
, AUDITSC_SUCCESS
);
236 result
= audit_comparator(ctx
->return_valid
, f
->op
, AUDITSC_FAILURE
);
241 for (j
= 0; j
< ctx
->name_count
; j
++) {
242 if (audit_comparator(MAJOR(ctx
->names
[j
].dev
), f
->op
, f
->val
)) {
251 for (j
= 0; j
< ctx
->name_count
; j
++) {
252 if (audit_comparator(MINOR(ctx
->names
[j
].dev
), f
->op
, f
->val
)) {
261 for (j
= 0; j
< ctx
->name_count
; j
++) {
262 if (audit_comparator(ctx
->names
[j
].ino
, f
->op
, f
->val
) ||
263 audit_comparator(ctx
->names
[j
].pino
, f
->op
, f
->val
)) {
273 result
= audit_comparator(ctx
->loginuid
, f
->op
, f
->val
);
280 /* NOTE: this may return negative values indicating
281 a temporary error. We simply treat this as a
282 match for now to avoid losing information that
283 may be wanted. An error message will also be
287 selinux_task_ctxid(tsk
, &sid
);
290 result
= selinux_audit_rule_match(sid
, f
->type
,
301 result
= audit_comparator(ctx
->argv
[f
->type
-AUDIT_ARG0
], f
->op
, f
->val
);
308 switch (rule
->action
) {
309 case AUDIT_NEVER
: *state
= AUDIT_DISABLED
; break;
310 case AUDIT_ALWAYS
: *state
= AUDIT_RECORD_CONTEXT
; break;
315 /* At process creation time, we can determine if system-call auditing is
316 * completely disabled for this task. Since we only have the task
317 * structure at this point, we can only check uid and gid.
319 static enum audit_state
audit_filter_task(struct task_struct
*tsk
)
321 struct audit_entry
*e
;
322 enum audit_state state
;
325 list_for_each_entry_rcu(e
, &audit_filter_list
[AUDIT_FILTER_TASK
], list
) {
326 if (audit_filter_rules(tsk
, &e
->rule
, NULL
, &state
)) {
332 return AUDIT_BUILD_CONTEXT
;
335 /* At syscall entry and exit time, this filter is called if the
336 * audit_state is not low enough that auditing cannot take place, but is
337 * also not high enough that we already know we have to write an audit
338 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
340 static enum audit_state
audit_filter_syscall(struct task_struct
*tsk
,
341 struct audit_context
*ctx
,
342 struct list_head
*list
)
344 struct audit_entry
*e
;
345 enum audit_state state
;
347 if (audit_pid
&& tsk
->tgid
== audit_pid
)
348 return AUDIT_DISABLED
;
351 if (!list_empty(list
)) {
352 int word
= AUDIT_WORD(ctx
->major
);
353 int bit
= AUDIT_BIT(ctx
->major
);
355 list_for_each_entry_rcu(e
, list
, list
) {
356 if ((e
->rule
.mask
[word
] & bit
) == bit
357 && audit_filter_rules(tsk
, &e
->rule
, ctx
, &state
)) {
364 return AUDIT_BUILD_CONTEXT
;
367 static inline struct audit_context
*audit_get_context(struct task_struct
*tsk
,
371 struct audit_context
*context
= tsk
->audit_context
;
373 if (likely(!context
))
375 context
->return_valid
= return_valid
;
376 context
->return_code
= return_code
;
378 if (context
->in_syscall
&& !context
->auditable
) {
379 enum audit_state state
;
380 state
= audit_filter_syscall(tsk
, context
, &audit_filter_list
[AUDIT_FILTER_EXIT
]);
381 if (state
== AUDIT_RECORD_CONTEXT
)
382 context
->auditable
= 1;
385 context
->pid
= tsk
->pid
;
386 context
->ppid
= sys_getppid(); /* sic. tsk == current in all cases */
387 context
->uid
= tsk
->uid
;
388 context
->gid
= tsk
->gid
;
389 context
->euid
= tsk
->euid
;
390 context
->suid
= tsk
->suid
;
391 context
->fsuid
= tsk
->fsuid
;
392 context
->egid
= tsk
->egid
;
393 context
->sgid
= tsk
->sgid
;
394 context
->fsgid
= tsk
->fsgid
;
395 context
->personality
= tsk
->personality
;
396 tsk
->audit_context
= NULL
;
400 static inline void audit_free_names(struct audit_context
*context
)
405 if (context
->auditable
406 ||context
->put_count
+ context
->ino_count
!= context
->name_count
) {
407 printk(KERN_ERR
"%s:%d(:%d): major=%d in_syscall=%d"
408 " name_count=%d put_count=%d"
409 " ino_count=%d [NOT freeing]\n",
411 context
->serial
, context
->major
, context
->in_syscall
,
412 context
->name_count
, context
->put_count
,
414 for (i
= 0; i
< context
->name_count
; i
++) {
415 printk(KERN_ERR
"names[%d] = %p = %s\n", i
,
416 context
->names
[i
].name
,
417 context
->names
[i
].name
?: "(null)");
424 context
->put_count
= 0;
425 context
->ino_count
= 0;
428 for (i
= 0; i
< context
->name_count
; i
++) {
429 if (context
->names
[i
].name
)
430 __putname(context
->names
[i
].name
);
432 context
->name_count
= 0;
436 mntput(context
->pwdmnt
);
438 context
->pwdmnt
= NULL
;
441 static inline void audit_free_aux(struct audit_context
*context
)
443 struct audit_aux_data
*aux
;
445 while ((aux
= context
->aux
)) {
446 if (aux
->type
== AUDIT_AVC_PATH
) {
447 struct audit_aux_data_path
*axi
= (void *)aux
;
452 context
->aux
= aux
->next
;
457 static inline void audit_zero_context(struct audit_context
*context
,
458 enum audit_state state
)
460 uid_t loginuid
= context
->loginuid
;
462 memset(context
, 0, sizeof(*context
));
463 context
->state
= state
;
464 context
->loginuid
= loginuid
;
467 static inline struct audit_context
*audit_alloc_context(enum audit_state state
)
469 struct audit_context
*context
;
471 if (!(context
= kmalloc(sizeof(*context
), GFP_KERNEL
)))
473 audit_zero_context(context
, state
);
478 * audit_alloc - allocate an audit context block for a task
481 * Filter on the task information and allocate a per-task audit context
482 * if necessary. Doing so turns on system call auditing for the
483 * specified task. This is called from copy_process, so no lock is
486 int audit_alloc(struct task_struct
*tsk
)
488 struct audit_context
*context
;
489 enum audit_state state
;
491 if (likely(!audit_enabled
))
492 return 0; /* Return if not auditing. */
494 state
= audit_filter_task(tsk
);
495 if (likely(state
== AUDIT_DISABLED
))
498 if (!(context
= audit_alloc_context(state
))) {
499 audit_log_lost("out of memory in audit_alloc");
503 /* Preserve login uid */
504 context
->loginuid
= -1;
505 if (current
->audit_context
)
506 context
->loginuid
= current
->audit_context
->loginuid
;
508 tsk
->audit_context
= context
;
509 set_tsk_thread_flag(tsk
, TIF_SYSCALL_AUDIT
);
513 static inline void audit_free_context(struct audit_context
*context
)
515 struct audit_context
*previous
;
519 previous
= context
->previous
;
520 if (previous
|| (count
&& count
< 10)) {
522 printk(KERN_ERR
"audit(:%d): major=%d name_count=%d:"
523 " freeing multiple contexts (%d)\n",
524 context
->serial
, context
->major
,
525 context
->name_count
, count
);
527 audit_free_names(context
);
528 audit_free_aux(context
);
533 printk(KERN_ERR
"audit: freed %d contexts\n", count
);
536 static void audit_log_task_context(struct audit_buffer
*ab
)
541 len
= security_getprocattr(current
, "current", NULL
, 0);
548 ctx
= kmalloc(len
, GFP_KERNEL
);
552 len
= security_getprocattr(current
, "current", ctx
, len
);
556 audit_log_format(ab
, " subj=%s", ctx
);
562 audit_panic("error in audit_log_task_context");
566 static void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
568 char name
[sizeof(tsk
->comm
)];
569 struct mm_struct
*mm
= tsk
->mm
;
570 struct vm_area_struct
*vma
;
574 get_task_comm(name
, tsk
);
575 audit_log_format(ab
, " comm=");
576 audit_log_untrustedstring(ab
, name
);
579 down_read(&mm
->mmap_sem
);
582 if ((vma
->vm_flags
& VM_EXECUTABLE
) &&
584 audit_log_d_path(ab
, "exe=",
585 vma
->vm_file
->f_dentry
,
586 vma
->vm_file
->f_vfsmnt
);
591 up_read(&mm
->mmap_sem
);
593 audit_log_task_context(ab
);
596 static void audit_log_exit(struct audit_context
*context
, struct task_struct
*tsk
)
598 int i
, call_panic
= 0;
599 struct audit_buffer
*ab
;
600 struct audit_aux_data
*aux
;
605 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_SYSCALL
);
607 return; /* audit_panic has been called */
608 audit_log_format(ab
, "arch=%x syscall=%d",
609 context
->arch
, context
->major
);
610 if (context
->personality
!= PER_LINUX
)
611 audit_log_format(ab
, " per=%lx", context
->personality
);
612 if (context
->return_valid
)
613 audit_log_format(ab
, " success=%s exit=%ld",
614 (context
->return_valid
==AUDITSC_SUCCESS
)?"yes":"no",
615 context
->return_code
);
616 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
617 tty
= tsk
->signal
->tty
->name
;
621 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
622 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
623 " euid=%u suid=%u fsuid=%u"
624 " egid=%u sgid=%u fsgid=%u tty=%s",
635 context
->euid
, context
->suid
, context
->fsuid
,
636 context
->egid
, context
->sgid
, context
->fsgid
, tty
);
637 audit_log_task_info(ab
, tsk
);
640 for (aux
= context
->aux
; aux
; aux
= aux
->next
) {
642 ab
= audit_log_start(context
, GFP_KERNEL
, aux
->type
);
644 continue; /* audit_panic has been called */
648 struct audit_aux_data_ipcctl
*axi
= (void *)aux
;
650 "ouid=%u ogid=%u mode=%x",
651 axi
->uid
, axi
->gid
, axi
->mode
);
652 if (axi
->osid
!= 0) {
655 if (selinux_ctxid_to_string(
656 axi
->osid
, &ctx
, &len
)) {
657 audit_log_format(ab
, " osid=%u",
661 audit_log_format(ab
, " obj=%s", ctx
);
666 case AUDIT_IPC_SET_PERM
: {
667 struct audit_aux_data_ipcctl
*axi
= (void *)aux
;
669 "qbytes=%lx ouid=%u ogid=%u mode=%x",
670 axi
->qbytes
, axi
->uid
, axi
->gid
, axi
->mode
);
674 struct audit_aux_data_execve
*axi
= (void *)aux
;
677 for (i
= 0, p
= axi
->mem
; i
< axi
->argc
; i
++) {
678 audit_log_format(ab
, "a%d=", i
);
679 p
= audit_log_untrustedstring(ab
, p
);
680 audit_log_format(ab
, "\n");
684 case AUDIT_SOCKETCALL
: {
686 struct audit_aux_data_socketcall
*axs
= (void *)aux
;
687 audit_log_format(ab
, "nargs=%d", axs
->nargs
);
688 for (i
=0; i
<axs
->nargs
; i
++)
689 audit_log_format(ab
, " a%d=%lx", i
, axs
->args
[i
]);
692 case AUDIT_SOCKADDR
: {
693 struct audit_aux_data_sockaddr
*axs
= (void *)aux
;
695 audit_log_format(ab
, "saddr=");
696 audit_log_hex(ab
, axs
->a
, axs
->len
);
699 case AUDIT_AVC_PATH
: {
700 struct audit_aux_data_path
*axi
= (void *)aux
;
701 audit_log_d_path(ab
, "path=", axi
->dentry
, axi
->mnt
);
708 if (context
->pwd
&& context
->pwdmnt
) {
709 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_CWD
);
711 audit_log_d_path(ab
, "cwd=", context
->pwd
, context
->pwdmnt
);
715 for (i
= 0; i
< context
->name_count
; i
++) {
716 unsigned long ino
= context
->names
[i
].ino
;
717 unsigned long pino
= context
->names
[i
].pino
;
719 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
721 continue; /* audit_panic has been called */
723 audit_log_format(ab
, "item=%d", i
);
725 audit_log_format(ab
, " name=");
726 if (context
->names
[i
].name
)
727 audit_log_untrustedstring(ab
, context
->names
[i
].name
);
729 audit_log_format(ab
, "(null)");
731 if (pino
!= (unsigned long)-1)
732 audit_log_format(ab
, " parent=%lu", pino
);
733 if (ino
!= (unsigned long)-1)
734 audit_log_format(ab
, " inode=%lu", ino
);
735 if ((pino
!= (unsigned long)-1) || (ino
!= (unsigned long)-1))
736 audit_log_format(ab
, " dev=%02x:%02x mode=%#o"
737 " ouid=%u ogid=%u rdev=%02x:%02x",
738 MAJOR(context
->names
[i
].dev
),
739 MINOR(context
->names
[i
].dev
),
740 context
->names
[i
].mode
,
741 context
->names
[i
].uid
,
742 context
->names
[i
].gid
,
743 MAJOR(context
->names
[i
].rdev
),
744 MINOR(context
->names
[i
].rdev
));
745 if (context
->names
[i
].osid
!= 0) {
748 if (selinux_ctxid_to_string(
749 context
->names
[i
].osid
, &ctx
, &len
)) {
750 audit_log_format(ab
, " osid=%u",
751 context
->names
[i
].osid
);
754 audit_log_format(ab
, " obj=%s", ctx
);
761 audit_panic("error converting sid to string");
765 * audit_free - free a per-task audit context
766 * @tsk: task whose audit context block to free
768 * Called from copy_process and do_exit
770 void audit_free(struct task_struct
*tsk
)
772 struct audit_context
*context
;
774 context
= audit_get_context(tsk
, 0, 0);
775 if (likely(!context
))
778 /* Check for system calls that do not go through the exit
779 * function (e.g., exit_group), then free context block.
780 * We use GFP_ATOMIC here because we might be doing this
781 * in the context of the idle thread */
782 /* that can happen only if we are called from do_exit() */
783 if (context
->in_syscall
&& context
->auditable
)
784 audit_log_exit(context
, tsk
);
786 audit_free_context(context
);
790 * audit_syscall_entry - fill in an audit record at syscall entry
791 * @tsk: task being audited
792 * @arch: architecture type
793 * @major: major syscall type (function)
794 * @a1: additional syscall register 1
795 * @a2: additional syscall register 2
796 * @a3: additional syscall register 3
797 * @a4: additional syscall register 4
799 * Fill in audit context at syscall entry. This only happens if the
800 * audit context was created when the task was created and the state or
801 * filters demand the audit context be built. If the state from the
802 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
803 * then the record will be written at syscall exit time (otherwise, it
804 * will only be written if another part of the kernel requests that it
807 void audit_syscall_entry(int arch
, int major
,
808 unsigned long a1
, unsigned long a2
,
809 unsigned long a3
, unsigned long a4
)
811 struct task_struct
*tsk
= current
;
812 struct audit_context
*context
= tsk
->audit_context
;
813 enum audit_state state
;
818 * This happens only on certain architectures that make system
819 * calls in kernel_thread via the entry.S interface, instead of
820 * with direct calls. (If you are porting to a new
821 * architecture, hitting this condition can indicate that you
822 * got the _exit/_leave calls backward in entry.S.)
826 * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S)
828 * This also happens with vm86 emulation in a non-nested manner
829 * (entries without exits), so this case must be caught.
831 if (context
->in_syscall
) {
832 struct audit_context
*newctx
;
836 "audit(:%d) pid=%d in syscall=%d;"
837 " entering syscall=%d\n",
838 context
->serial
, tsk
->pid
, context
->major
, major
);
840 newctx
= audit_alloc_context(context
->state
);
842 newctx
->previous
= context
;
844 tsk
->audit_context
= newctx
;
846 /* If we can't alloc a new context, the best we
847 * can do is to leak memory (any pending putname
848 * will be lost). The only other alternative is
849 * to abandon auditing. */
850 audit_zero_context(context
, context
->state
);
853 BUG_ON(context
->in_syscall
|| context
->name_count
);
858 context
->arch
= arch
;
859 context
->major
= major
;
860 context
->argv
[0] = a1
;
861 context
->argv
[1] = a2
;
862 context
->argv
[2] = a3
;
863 context
->argv
[3] = a4
;
865 state
= context
->state
;
866 if (state
== AUDIT_SETUP_CONTEXT
|| state
== AUDIT_BUILD_CONTEXT
)
867 state
= audit_filter_syscall(tsk
, context
, &audit_filter_list
[AUDIT_FILTER_ENTRY
]);
868 if (likely(state
== AUDIT_DISABLED
))
872 context
->ctime
= CURRENT_TIME
;
873 context
->in_syscall
= 1;
874 context
->auditable
= !!(state
== AUDIT_RECORD_CONTEXT
);
878 * audit_syscall_exit - deallocate audit context after a system call
879 * @tsk: task being audited
880 * @valid: success/failure flag
881 * @return_code: syscall return value
883 * Tear down after system call. If the audit context has been marked as
884 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
885 * filtering, or because some other part of the kernel write an audit
886 * message), then write out the syscall information. In call cases,
887 * free the names stored from getname().
889 void audit_syscall_exit(int valid
, long return_code
)
891 struct task_struct
*tsk
= current
;
892 struct audit_context
*context
;
894 context
= audit_get_context(tsk
, valid
, return_code
);
896 if (likely(!context
))
899 if (context
->in_syscall
&& context
->auditable
)
900 audit_log_exit(context
, tsk
);
902 context
->in_syscall
= 0;
903 context
->auditable
= 0;
905 if (context
->previous
) {
906 struct audit_context
*new_context
= context
->previous
;
907 context
->previous
= NULL
;
908 audit_free_context(context
);
909 tsk
->audit_context
= new_context
;
911 audit_free_names(context
);
912 audit_free_aux(context
);
913 tsk
->audit_context
= context
;
918 * audit_getname - add a name to the list
921 * Add a name to the list of audit names for this context.
922 * Called from fs/namei.c:getname().
924 void __audit_getname(const char *name
)
926 struct audit_context
*context
= current
->audit_context
;
928 if (IS_ERR(name
) || !name
)
931 if (!context
->in_syscall
) {
933 printk(KERN_ERR
"%s:%d(:%d): ignoring getname(%p)\n",
934 __FILE__
, __LINE__
, context
->serial
, name
);
939 BUG_ON(context
->name_count
>= AUDIT_NAMES
);
940 context
->names
[context
->name_count
].name
= name
;
941 context
->names
[context
->name_count
].ino
= (unsigned long)-1;
942 ++context
->name_count
;
944 read_lock(¤t
->fs
->lock
);
945 context
->pwd
= dget(current
->fs
->pwd
);
946 context
->pwdmnt
= mntget(current
->fs
->pwdmnt
);
947 read_unlock(¤t
->fs
->lock
);
952 /* audit_putname - intercept a putname request
953 * @name: name to intercept and delay for putname
955 * If we have stored the name from getname in the audit context,
956 * then we delay the putname until syscall exit.
957 * Called from include/linux/fs.h:putname().
959 void audit_putname(const char *name
)
961 struct audit_context
*context
= current
->audit_context
;
964 if (!context
->in_syscall
) {
966 printk(KERN_ERR
"%s:%d(:%d): __putname(%p)\n",
967 __FILE__
, __LINE__
, context
->serial
, name
);
968 if (context
->name_count
) {
970 for (i
= 0; i
< context
->name_count
; i
++)
971 printk(KERN_ERR
"name[%d] = %p = %s\n", i
,
972 context
->names
[i
].name
,
973 context
->names
[i
].name
?: "(null)");
980 ++context
->put_count
;
981 if (context
->put_count
> context
->name_count
) {
982 printk(KERN_ERR
"%s:%d(:%d): major=%d"
983 " in_syscall=%d putname(%p) name_count=%d"
986 context
->serial
, context
->major
,
987 context
->in_syscall
, name
, context
->name_count
,
995 static void audit_inode_context(int idx
, const struct inode
*inode
)
997 struct audit_context
*context
= current
->audit_context
;
999 selinux_get_inode_sid(inode
, &context
->names
[idx
].osid
);
1004 * audit_inode - store the inode and device from a lookup
1005 * @name: name being audited
1006 * @inode: inode being audited
1007 * @flags: lookup flags (as used in path_lookup())
1009 * Called from fs/namei.c:path_lookup().
1011 void __audit_inode(const char *name
, const struct inode
*inode
, unsigned flags
)
1014 struct audit_context
*context
= current
->audit_context
;
1016 if (!context
->in_syscall
)
1018 if (context
->name_count
1019 && context
->names
[context
->name_count
-1].name
1020 && context
->names
[context
->name_count
-1].name
== name
)
1021 idx
= context
->name_count
- 1;
1022 else if (context
->name_count
> 1
1023 && context
->names
[context
->name_count
-2].name
1024 && context
->names
[context
->name_count
-2].name
== name
)
1025 idx
= context
->name_count
- 2;
1027 /* FIXME: how much do we care about inodes that have no
1028 * associated name? */
1029 if (context
->name_count
>= AUDIT_NAMES
- AUDIT_NAMES_RESERVED
)
1031 idx
= context
->name_count
++;
1032 context
->names
[idx
].name
= NULL
;
1034 ++context
->ino_count
;
1037 context
->names
[idx
].dev
= inode
->i_sb
->s_dev
;
1038 context
->names
[idx
].mode
= inode
->i_mode
;
1039 context
->names
[idx
].uid
= inode
->i_uid
;
1040 context
->names
[idx
].gid
= inode
->i_gid
;
1041 context
->names
[idx
].rdev
= inode
->i_rdev
;
1042 audit_inode_context(idx
, inode
);
1043 if ((flags
& LOOKUP_PARENT
) && (strcmp(name
, "/") != 0) &&
1044 (strcmp(name
, ".") != 0)) {
1045 context
->names
[idx
].ino
= (unsigned long)-1;
1046 context
->names
[idx
].pino
= inode
->i_ino
;
1048 context
->names
[idx
].ino
= inode
->i_ino
;
1049 context
->names
[idx
].pino
= (unsigned long)-1;
1054 * audit_inode_child - collect inode info for created/removed objects
1055 * @dname: inode's dentry name
1056 * @inode: inode being audited
1057 * @pino: inode number of dentry parent
1059 * For syscalls that create or remove filesystem objects, audit_inode
1060 * can only collect information for the filesystem object's parent.
1061 * This call updates the audit context with the child's information.
1062 * Syscalls that create a new filesystem object must be hooked after
1063 * the object is created. Syscalls that remove a filesystem object
1064 * must be hooked prior, in order to capture the target inode during
1065 * unsuccessful attempts.
1067 void __audit_inode_child(const char *dname
, const struct inode
*inode
,
1071 struct audit_context
*context
= current
->audit_context
;
1073 if (!context
->in_syscall
)
1076 /* determine matching parent */
1078 for (idx
= 0; idx
< context
->name_count
; idx
++)
1079 if (context
->names
[idx
].pino
== pino
) {
1081 const char *name
= context
->names
[idx
].name
;
1082 int dlen
= strlen(dname
);
1083 int nlen
= name
? strlen(name
) : 0;
1088 /* disregard trailing slashes */
1089 n
= name
+ nlen
- 1;
1090 while ((*n
== '/') && (n
> name
))
1093 /* find last path component */
1097 else if (n
> name
) {
1104 if (strncmp(n
, dname
, dlen
) == 0)
1105 goto update_context
;
1108 /* catch-all in case match not found */
1109 idx
= context
->name_count
++;
1110 context
->names
[idx
].name
= NULL
;
1111 context
->names
[idx
].pino
= pino
;
1113 context
->ino_count
++;
1118 context
->names
[idx
].ino
= inode
->i_ino
;
1119 context
->names
[idx
].dev
= inode
->i_sb
->s_dev
;
1120 context
->names
[idx
].mode
= inode
->i_mode
;
1121 context
->names
[idx
].uid
= inode
->i_uid
;
1122 context
->names
[idx
].gid
= inode
->i_gid
;
1123 context
->names
[idx
].rdev
= inode
->i_rdev
;
1124 audit_inode_context(idx
, inode
);
1129 * auditsc_get_stamp - get local copies of audit_context values
1130 * @ctx: audit_context for the task
1131 * @t: timespec to store time recorded in the audit_context
1132 * @serial: serial value that is recorded in the audit_context
1134 * Also sets the context as auditable.
1136 void auditsc_get_stamp(struct audit_context
*ctx
,
1137 struct timespec
*t
, unsigned int *serial
)
1140 ctx
->serial
= audit_serial();
1141 t
->tv_sec
= ctx
->ctime
.tv_sec
;
1142 t
->tv_nsec
= ctx
->ctime
.tv_nsec
;
1143 *serial
= ctx
->serial
;
1148 * audit_set_loginuid - set a task's audit_context loginuid
1149 * @task: task whose audit context is being modified
1150 * @loginuid: loginuid value
1154 * Called (set) from fs/proc/base.c::proc_loginuid_write().
1156 int audit_set_loginuid(struct task_struct
*task
, uid_t loginuid
)
1158 if (task
->audit_context
) {
1159 struct audit_buffer
*ab
;
1161 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_LOGIN
);
1163 audit_log_format(ab
, "login pid=%d uid=%u "
1164 "old auid=%u new auid=%u",
1165 task
->pid
, task
->uid
,
1166 task
->audit_context
->loginuid
, loginuid
);
1169 task
->audit_context
->loginuid
= loginuid
;
1175 * audit_get_loginuid - get the loginuid for an audit_context
1176 * @ctx: the audit_context
1178 * Returns the context's loginuid or -1 if @ctx is NULL.
1180 uid_t
audit_get_loginuid(struct audit_context
*ctx
)
1182 return ctx
? ctx
->loginuid
: -1;
1186 * audit_ipc_obj - record audit data for ipc object
1187 * @ipcp: ipc permissions
1189 * Returns 0 for success or NULL context or < 0 on error.
1191 int __audit_ipc_obj(struct kern_ipc_perm
*ipcp
)
1193 struct audit_aux_data_ipcctl
*ax
;
1194 struct audit_context
*context
= current
->audit_context
;
1196 ax
= kmalloc(sizeof(*ax
), GFP_ATOMIC
);
1200 ax
->uid
= ipcp
->uid
;
1201 ax
->gid
= ipcp
->gid
;
1202 ax
->mode
= ipcp
->mode
;
1203 selinux_get_ipc_sid(ipcp
, &ax
->osid
);
1205 ax
->d
.type
= AUDIT_IPC
;
1206 ax
->d
.next
= context
->aux
;
1207 context
->aux
= (void *)ax
;
1212 * audit_ipc_set_perm - record audit data for new ipc permissions
1213 * @qbytes: msgq bytes
1214 * @uid: msgq user id
1215 * @gid: msgq group id
1216 * @mode: msgq mode (permissions)
1218 * Returns 0 for success or NULL context or < 0 on error.
1220 int __audit_ipc_set_perm(unsigned long qbytes
, uid_t uid
, gid_t gid
, mode_t mode
)
1222 struct audit_aux_data_ipcctl
*ax
;
1223 struct audit_context
*context
= current
->audit_context
;
1225 ax
= kmalloc(sizeof(*ax
), GFP_ATOMIC
);
1229 ax
->qbytes
= qbytes
;
1234 ax
->d
.type
= AUDIT_IPC_SET_PERM
;
1235 ax
->d
.next
= context
->aux
;
1236 context
->aux
= (void *)ax
;
1240 int audit_bprm(struct linux_binprm
*bprm
)
1242 struct audit_aux_data_execve
*ax
;
1243 struct audit_context
*context
= current
->audit_context
;
1244 unsigned long p
, next
;
1247 if (likely(!audit_enabled
|| !context
))
1250 ax
= kmalloc(sizeof(*ax
) + PAGE_SIZE
* MAX_ARG_PAGES
- bprm
->p
,
1255 ax
->argc
= bprm
->argc
;
1256 ax
->envc
= bprm
->envc
;
1257 for (p
= bprm
->p
, to
= ax
->mem
; p
< MAX_ARG_PAGES
*PAGE_SIZE
; p
= next
) {
1258 struct page
*page
= bprm
->page
[p
/ PAGE_SIZE
];
1259 void *kaddr
= kmap(page
);
1260 next
= (p
+ PAGE_SIZE
) & ~(PAGE_SIZE
- 1);
1261 memcpy(to
, kaddr
+ (p
& (PAGE_SIZE
- 1)), next
- p
);
1266 ax
->d
.type
= AUDIT_EXECVE
;
1267 ax
->d
.next
= context
->aux
;
1268 context
->aux
= (void *)ax
;
1274 * audit_socketcall - record audit data for sys_socketcall
1275 * @nargs: number of args
1278 * Returns 0 for success or NULL context or < 0 on error.
1280 int audit_socketcall(int nargs
, unsigned long *args
)
1282 struct audit_aux_data_socketcall
*ax
;
1283 struct audit_context
*context
= current
->audit_context
;
1285 if (likely(!context
))
1288 ax
= kmalloc(sizeof(*ax
) + nargs
* sizeof(unsigned long), GFP_KERNEL
);
1293 memcpy(ax
->args
, args
, nargs
* sizeof(unsigned long));
1295 ax
->d
.type
= AUDIT_SOCKETCALL
;
1296 ax
->d
.next
= context
->aux
;
1297 context
->aux
= (void *)ax
;
1302 * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
1303 * @len: data length in user space
1304 * @a: data address in kernel space
1306 * Returns 0 for success or NULL context or < 0 on error.
1308 int audit_sockaddr(int len
, void *a
)
1310 struct audit_aux_data_sockaddr
*ax
;
1311 struct audit_context
*context
= current
->audit_context
;
1313 if (likely(!context
))
1316 ax
= kmalloc(sizeof(*ax
) + len
, GFP_KERNEL
);
1321 memcpy(ax
->a
, a
, len
);
1323 ax
->d
.type
= AUDIT_SOCKADDR
;
1324 ax
->d
.next
= context
->aux
;
1325 context
->aux
= (void *)ax
;
1330 * audit_avc_path - record the granting or denial of permissions
1331 * @dentry: dentry to record
1332 * @mnt: mnt to record
1334 * Returns 0 for success or NULL context or < 0 on error.
1336 * Called from security/selinux/avc.c::avc_audit()
1338 int audit_avc_path(struct dentry
*dentry
, struct vfsmount
*mnt
)
1340 struct audit_aux_data_path
*ax
;
1341 struct audit_context
*context
= current
->audit_context
;
1343 if (likely(!context
))
1346 ax
= kmalloc(sizeof(*ax
), GFP_ATOMIC
);
1350 ax
->dentry
= dget(dentry
);
1351 ax
->mnt
= mntget(mnt
);
1353 ax
->d
.type
= AUDIT_AVC_PATH
;
1354 ax
->d
.next
= context
->aux
;
1355 context
->aux
= (void *)ax
;
1360 * audit_signal_info - record signal info for shutting down audit subsystem
1361 * @sig: signal value
1362 * @t: task being signaled
1364 * If the audit subsystem is being terminated, record the task (pid)
1365 * and uid that is doing that.
1367 void __audit_signal_info(int sig
, struct task_struct
*t
)
1369 extern pid_t audit_sig_pid
;
1370 extern uid_t audit_sig_uid
;
1371 extern u32 audit_sig_sid
;
1373 if (sig
== SIGTERM
|| sig
== SIGHUP
|| sig
== SIGUSR1
) {
1374 struct task_struct
*tsk
= current
;
1375 struct audit_context
*ctx
= tsk
->audit_context
;
1376 audit_sig_pid
= tsk
->pid
;
1378 audit_sig_uid
= ctx
->loginuid
;
1380 audit_sig_uid
= tsk
->uid
;
1381 selinux_get_task_sid(tsk
, &audit_sig_sid
);