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.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
23 * Many of the ideas implemented here are from Stephen C. Tweedie,
24 * especially the idea of avoiding a copy by using getname.
26 * The method for actual interception of syscall entry and exit (not in
27 * this file -- see entry.S) is based on a GPL'd patch written by
28 * okir@suse.de and Copyright 2003 SuSE Linux AG.
32 #include <linux/init.h>
33 #include <asm/atomic.h>
34 #include <asm/types.h>
36 #include <linux/module.h>
37 #include <linux/mount.h>
38 #include <linux/socket.h>
39 #include <linux/audit.h>
40 #include <linux/personality.h>
41 #include <linux/time.h>
42 #include <asm/unistd.h>
45 1 = put_count checking
46 2 = verbose put_count checking
50 /* No syscall auditing will take place unless audit_enabled != 0. */
51 extern int audit_enabled
;
53 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
54 * for saving names from getname(). */
55 #define AUDIT_NAMES 20
57 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
58 * audit_context from being used for nameless inodes from
60 #define AUDIT_NAMES_RESERVED 7
62 /* At task start time, the audit_state is set in the audit_context using
63 a per-task filter. At syscall entry, the audit_state is augmented by
64 the syscall filter. */
66 AUDIT_DISABLED
, /* Do not create per-task audit_context.
67 * No syscall-specific audit records can
69 AUDIT_SETUP_CONTEXT
, /* Create the per-task audit_context,
70 * but don't necessarily fill it in at
71 * syscall entry time (i.e., filter
73 AUDIT_BUILD_CONTEXT
, /* Create the per-task audit_context,
74 * and always fill it in at syscall
75 * entry time. This makes a full
76 * syscall record available if some
77 * other part of the kernel decides it
78 * should be recorded. */
79 AUDIT_RECORD_CONTEXT
/* Create the per-task audit_context,
80 * always fill it in at syscall entry
81 * time, and always write out the audit
82 * record at syscall exit time. */
85 /* When fs/namei.c:getname() is called, we store the pointer in name and
86 * we don't let putname() free it (instead we free all of the saved
87 * pointers at syscall exit time).
89 * Further, in fs/namei.c:path_lookup() we store the inode and device. */
100 struct audit_aux_data
{
101 struct audit_aux_data
*next
;
105 #define AUDIT_AUX_IPCPERM 0
107 struct audit_aux_data_ipcctl
{
108 struct audit_aux_data d
;
110 unsigned long qbytes
;
116 struct audit_aux_data_socketcall
{
117 struct audit_aux_data d
;
119 unsigned long args
[0];
122 struct audit_aux_data_sockaddr
{
123 struct audit_aux_data d
;
128 struct audit_aux_data_path
{
129 struct audit_aux_data d
;
130 struct dentry
*dentry
;
131 struct vfsmount
*mnt
;
134 /* The per-task audit context. */
135 struct audit_context
{
136 int in_syscall
; /* 1 if task is in a syscall */
137 enum audit_state state
;
138 unsigned int serial
; /* serial number for record */
139 struct timespec ctime
; /* time of syscall entry */
140 uid_t loginuid
; /* login uid (identity) */
141 int major
; /* syscall number */
142 unsigned long argv
[4]; /* syscall arguments */
143 int return_valid
; /* return code is valid */
144 long return_code
;/* syscall return code */
145 int auditable
; /* 1 if record should be written */
147 struct audit_names names
[AUDIT_NAMES
];
148 struct audit_context
*previous
; /* For nested syscalls */
149 struct audit_aux_data
*aux
;
151 /* Save things to print about task_struct */
153 uid_t uid
, euid
, suid
, fsuid
;
154 gid_t gid
, egid
, sgid
, fsgid
;
155 unsigned long personality
;
165 /* There are three lists of rules -- one to search at task creation
166 * time, one to search at syscall entry time, and another to search at
167 * syscall exit time. */
168 static LIST_HEAD(audit_tsklist
);
169 static LIST_HEAD(audit_entlist
);
170 static LIST_HEAD(audit_extlist
);
173 struct list_head list
;
175 struct audit_rule rule
;
178 extern int audit_pid
;
180 /* Check to see if two rules are identical. It is called from
181 * audit_del_rule during AUDIT_DEL. */
182 static int audit_compare_rule(struct audit_rule
*a
, struct audit_rule
*b
)
186 if (a
->flags
!= b
->flags
)
189 if (a
->action
!= b
->action
)
192 if (a
->field_count
!= b
->field_count
)
195 for (i
= 0; i
< a
->field_count
; i
++) {
196 if (a
->fields
[i
] != b
->fields
[i
]
197 || a
->values
[i
] != b
->values
[i
])
201 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++)
202 if (a
->mask
[i
] != b
->mask
[i
])
208 /* Note that audit_add_rule and audit_del_rule are called via
209 * audit_receive() in audit.c, and are protected by
210 * audit_netlink_sem. */
211 static inline int audit_add_rule(struct audit_entry
*entry
,
212 struct list_head
*list
)
214 if (entry
->rule
.flags
& AUDIT_PREPEND
) {
215 entry
->rule
.flags
&= ~AUDIT_PREPEND
;
216 list_add_rcu(&entry
->list
, list
);
218 list_add_tail_rcu(&entry
->list
, list
);
223 static void audit_free_rule(struct rcu_head
*head
)
225 struct audit_entry
*e
= container_of(head
, struct audit_entry
, rcu
);
229 /* Note that audit_add_rule and audit_del_rule are called via
230 * audit_receive() in audit.c, and are protected by
231 * audit_netlink_sem. */
232 static inline int audit_del_rule(struct audit_rule
*rule
,
233 struct list_head
*list
)
235 struct audit_entry
*e
;
237 /* Do not use the _rcu iterator here, since this is the only
238 * deletion routine. */
239 list_for_each_entry(e
, list
, list
) {
240 if (!audit_compare_rule(rule
, &e
->rule
)) {
241 list_del_rcu(&e
->list
);
242 call_rcu(&e
->rcu
, audit_free_rule
);
246 return -EFAULT
; /* No matching rule */
249 /* Copy rule from user-space to kernel-space. Called during
251 static int audit_copy_rule(struct audit_rule
*d
, struct audit_rule
*s
)
255 if (s
->action
!= AUDIT_NEVER
256 && s
->action
!= AUDIT_POSSIBLE
257 && s
->action
!= AUDIT_ALWAYS
)
259 if (s
->field_count
< 0 || s
->field_count
> AUDIT_MAX_FIELDS
)
263 d
->action
= s
->action
;
264 d
->field_count
= s
->field_count
;
265 for (i
= 0; i
< d
->field_count
; i
++) {
266 d
->fields
[i
] = s
->fields
[i
];
267 d
->values
[i
] = s
->values
[i
];
269 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++) d
->mask
[i
] = s
->mask
[i
];
273 int audit_receive_filter(int type
, int pid
, int uid
, int seq
, void *data
,
277 struct audit_entry
*entry
;
282 /* The *_rcu iterators not needed here because we are
283 always called with audit_netlink_sem held. */
284 list_for_each_entry(entry
, &audit_tsklist
, list
)
285 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
286 &entry
->rule
, sizeof(entry
->rule
));
287 list_for_each_entry(entry
, &audit_entlist
, list
)
288 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
289 &entry
->rule
, sizeof(entry
->rule
));
290 list_for_each_entry(entry
, &audit_extlist
, list
)
291 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
292 &entry
->rule
, sizeof(entry
->rule
));
293 audit_send_reply(pid
, seq
, AUDIT_LIST
, 1, 1, NULL
, 0);
296 if (!(entry
= kmalloc(sizeof(*entry
), GFP_KERNEL
)))
298 if (audit_copy_rule(&entry
->rule
, data
)) {
302 flags
= entry
->rule
.flags
;
303 if (!err
&& (flags
& AUDIT_PER_TASK
))
304 err
= audit_add_rule(entry
, &audit_tsklist
);
305 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
306 err
= audit_add_rule(entry
, &audit_entlist
);
307 if (!err
&& (flags
& AUDIT_AT_EXIT
))
308 err
= audit_add_rule(entry
, &audit_extlist
);
309 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
310 "auid %u added an audit rule\n", loginuid
);
313 flags
=((struct audit_rule
*)data
)->flags
;
314 if (!err
&& (flags
& AUDIT_PER_TASK
))
315 err
= audit_del_rule(data
, &audit_tsklist
);
316 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
317 err
= audit_del_rule(data
, &audit_entlist
);
318 if (!err
&& (flags
& AUDIT_AT_EXIT
))
319 err
= audit_del_rule(data
, &audit_extlist
);
320 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
321 "auid %u removed an audit rule\n", loginuid
);
330 /* Compare a task_struct with an audit_rule. Return 1 on match, 0
332 static int audit_filter_rules(struct task_struct
*tsk
,
333 struct audit_rule
*rule
,
334 struct audit_context
*ctx
,
335 enum audit_state
*state
)
339 for (i
= 0; i
< rule
->field_count
; i
++) {
340 u32 field
= rule
->fields
[i
] & ~AUDIT_NEGATE
;
341 u32 value
= rule
->values
[i
];
346 result
= (tsk
->pid
== value
);
349 result
= (tsk
->uid
== value
);
352 result
= (tsk
->euid
== value
);
355 result
= (tsk
->suid
== value
);
358 result
= (tsk
->fsuid
== value
);
361 result
= (tsk
->gid
== value
);
364 result
= (tsk
->egid
== value
);
367 result
= (tsk
->sgid
== value
);
370 result
= (tsk
->fsgid
== value
);
373 result
= (tsk
->personality
== value
);
377 result
= (ctx
->arch
== value
);
381 if (ctx
&& ctx
->return_valid
)
382 result
= (ctx
->return_code
== value
);
385 if (ctx
&& ctx
->return_valid
)
386 result
= (ctx
->return_valid
== AUDITSC_SUCCESS
);
390 for (j
= 0; j
< ctx
->name_count
; j
++) {
391 if (MAJOR(ctx
->names
[j
].dev
)==value
) {
400 for (j
= 0; j
< ctx
->name_count
; j
++) {
401 if (MINOR(ctx
->names
[j
].dev
)==value
) {
410 for (j
= 0; j
< ctx
->name_count
; j
++) {
411 if (ctx
->names
[j
].ino
== value
) {
421 result
= (ctx
->loginuid
== value
);
428 result
= (ctx
->argv
[field
-AUDIT_ARG0
]==value
);
432 if (rule
->fields
[i
] & AUDIT_NEGATE
)
437 switch (rule
->action
) {
438 case AUDIT_NEVER
: *state
= AUDIT_DISABLED
; break;
439 case AUDIT_POSSIBLE
: *state
= AUDIT_BUILD_CONTEXT
; break;
440 case AUDIT_ALWAYS
: *state
= AUDIT_RECORD_CONTEXT
; break;
445 /* At process creation time, we can determine if system-call auditing is
446 * completely disabled for this task. Since we only have the task
447 * structure at this point, we can only check uid and gid.
449 static enum audit_state
audit_filter_task(struct task_struct
*tsk
)
451 struct audit_entry
*e
;
452 enum audit_state state
;
455 list_for_each_entry_rcu(e
, &audit_tsklist
, list
) {
456 if (audit_filter_rules(tsk
, &e
->rule
, NULL
, &state
)) {
462 return AUDIT_BUILD_CONTEXT
;
465 /* At syscall entry and exit time, this filter is called if the
466 * audit_state is not low enough that auditing cannot take place, but is
467 * also not high enough that we already know we have to write an audit
468 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
470 static enum audit_state
audit_filter_syscall(struct task_struct
*tsk
,
471 struct audit_context
*ctx
,
472 struct list_head
*list
)
474 struct audit_entry
*e
;
475 enum audit_state state
;
476 int word
= AUDIT_WORD(ctx
->major
);
477 int bit
= AUDIT_BIT(ctx
->major
);
480 list_for_each_entry_rcu(e
, list
, list
) {
481 if ((e
->rule
.mask
[word
] & bit
) == bit
482 && audit_filter_rules(tsk
, &e
->rule
, ctx
, &state
)) {
488 return AUDIT_BUILD_CONTEXT
;
491 /* This should be called with task_lock() held. */
492 static inline struct audit_context
*audit_get_context(struct task_struct
*tsk
,
496 struct audit_context
*context
= tsk
->audit_context
;
498 if (likely(!context
))
500 context
->return_valid
= return_valid
;
501 context
->return_code
= return_code
;
503 if (context
->in_syscall
&& !context
->auditable
) {
504 enum audit_state state
;
505 state
= audit_filter_syscall(tsk
, context
, &audit_extlist
);
506 if (state
== AUDIT_RECORD_CONTEXT
)
507 context
->auditable
= 1;
510 context
->pid
= tsk
->pid
;
511 context
->uid
= tsk
->uid
;
512 context
->gid
= tsk
->gid
;
513 context
->euid
= tsk
->euid
;
514 context
->suid
= tsk
->suid
;
515 context
->fsuid
= tsk
->fsuid
;
516 context
->egid
= tsk
->egid
;
517 context
->sgid
= tsk
->sgid
;
518 context
->fsgid
= tsk
->fsgid
;
519 context
->personality
= tsk
->personality
;
520 tsk
->audit_context
= NULL
;
524 static inline void audit_free_names(struct audit_context
*context
)
529 if (context
->auditable
530 ||context
->put_count
+ context
->ino_count
!= context
->name_count
) {
531 printk(KERN_ERR
"audit.c:%d(:%d): major=%d in_syscall=%d"
532 " name_count=%d put_count=%d"
533 " ino_count=%d [NOT freeing]\n",
535 context
->serial
, context
->major
, context
->in_syscall
,
536 context
->name_count
, context
->put_count
,
538 for (i
= 0; i
< context
->name_count
; i
++)
539 printk(KERN_ERR
"names[%d] = %p = %s\n", i
,
540 context
->names
[i
].name
,
541 context
->names
[i
].name
);
547 context
->put_count
= 0;
548 context
->ino_count
= 0;
551 for (i
= 0; i
< context
->name_count
; i
++)
552 if (context
->names
[i
].name
)
553 __putname(context
->names
[i
].name
);
554 context
->name_count
= 0;
557 static inline void audit_free_aux(struct audit_context
*context
)
559 struct audit_aux_data
*aux
;
561 while ((aux
= context
->aux
)) {
562 if (aux
->type
== AUDIT_AVC_PATH
) {
563 struct audit_aux_data_path
*axi
= (void *)aux
;
567 context
->aux
= aux
->next
;
572 static inline void audit_zero_context(struct audit_context
*context
,
573 enum audit_state state
)
575 uid_t loginuid
= context
->loginuid
;
577 memset(context
, 0, sizeof(*context
));
578 context
->state
= state
;
579 context
->loginuid
= loginuid
;
582 static inline struct audit_context
*audit_alloc_context(enum audit_state state
)
584 struct audit_context
*context
;
586 if (!(context
= kmalloc(sizeof(*context
), GFP_KERNEL
)))
588 audit_zero_context(context
, state
);
592 /* Filter on the task information and allocate a per-task audit context
593 * if necessary. Doing so turns on system call auditing for the
594 * specified task. This is called from copy_process, so no lock is
596 int audit_alloc(struct task_struct
*tsk
)
598 struct audit_context
*context
;
599 enum audit_state state
;
601 if (likely(!audit_enabled
))
602 return 0; /* Return if not auditing. */
604 state
= audit_filter_task(tsk
);
605 if (likely(state
== AUDIT_DISABLED
))
608 if (!(context
= audit_alloc_context(state
))) {
609 audit_log_lost("out of memory in audit_alloc");
613 /* Preserve login uid */
614 context
->loginuid
= -1;
615 if (current
->audit_context
)
616 context
->loginuid
= current
->audit_context
->loginuid
;
618 tsk
->audit_context
= context
;
619 set_tsk_thread_flag(tsk
, TIF_SYSCALL_AUDIT
);
623 static inline void audit_free_context(struct audit_context
*context
)
625 struct audit_context
*previous
;
629 previous
= context
->previous
;
630 if (previous
|| (count
&& count
< 10)) {
632 printk(KERN_ERR
"audit(:%d): major=%d name_count=%d:"
633 " freeing multiple contexts (%d)\n",
634 context
->serial
, context
->major
,
635 context
->name_count
, count
);
637 audit_free_names(context
);
638 audit_free_aux(context
);
643 printk(KERN_ERR
"audit: freed %d contexts\n", count
);
646 static void audit_log_task_info(struct audit_buffer
*ab
)
648 char name
[sizeof(current
->comm
)];
649 struct mm_struct
*mm
= current
->mm
;
650 struct vm_area_struct
*vma
;
652 get_task_comm(name
, current
);
653 audit_log_format(ab
, " comm=%s", name
);
658 down_read(&mm
->mmap_sem
);
661 if ((vma
->vm_flags
& VM_EXECUTABLE
) &&
663 audit_log_d_path(ab
, "exe=",
664 vma
->vm_file
->f_dentry
,
665 vma
->vm_file
->f_vfsmnt
);
670 up_read(&mm
->mmap_sem
);
673 static void audit_log_exit(struct audit_context
*context
)
676 struct audit_buffer
*ab
;
678 ab
= audit_log_start(context
, AUDIT_SYSCALL
);
680 return; /* audit_panic has been called */
681 audit_log_format(ab
, "syscall=%d", context
->major
);
682 if (context
->personality
!= PER_LINUX
)
683 audit_log_format(ab
, " per=%lx", context
->personality
);
684 audit_log_format(ab
, " arch=%x", context
->arch
);
685 if (context
->return_valid
)
686 audit_log_format(ab
, " success=%s exit=%ld",
687 (context
->return_valid
==AUDITSC_SUCCESS
)?"yes":"no",
688 context
->return_code
);
690 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
691 " pid=%d loginuid=%d uid=%d gid=%d"
692 " euid=%d suid=%d fsuid=%d"
693 " egid=%d sgid=%d fsgid=%d",
703 context
->euid
, context
->suid
, context
->fsuid
,
704 context
->egid
, context
->sgid
, context
->fsgid
);
705 audit_log_task_info(ab
);
707 while (context
->aux
) {
708 struct audit_aux_data
*aux
;
712 ab
= audit_log_start(context
, aux
->type
);
714 continue; /* audit_panic has been called */
718 struct audit_aux_data_ipcctl
*axi
= (void *)aux
;
720 " qbytes=%lx iuid=%d igid=%d mode=%x",
721 axi
->qbytes
, axi
->uid
, axi
->gid
, axi
->mode
);
724 case AUDIT_SOCKETCALL
: {
726 struct audit_aux_data_socketcall
*axs
= (void *)aux
;
727 audit_log_format(ab
, "nargs=%d", axs
->nargs
);
728 for (i
=0; i
<axs
->nargs
; i
++)
729 audit_log_format(ab
, " a%d=%lx", i
, axs
->args
[i
]);
732 case AUDIT_SOCKADDR
: {
733 struct audit_aux_data_sockaddr
*axs
= (void *)aux
;
735 audit_log_format(ab
, "saddr=");
736 audit_log_hex(ab
, axs
->a
, axs
->len
);
739 case AUDIT_AVC_PATH
: {
740 struct audit_aux_data_path
*axi
= (void *)aux
;
741 audit_log_d_path(ab
, "path=", axi
->dentry
, axi
->mnt
);
749 context
->aux
= aux
->next
;
753 for (i
= 0; i
< context
->name_count
; i
++) {
754 ab
= audit_log_start(context
, AUDIT_PATH
);
756 continue; /* audit_panic has been called */
757 audit_log_format(ab
, "item=%d", i
);
758 if (context
->names
[i
].name
) {
759 audit_log_format(ab
, " name=");
760 audit_log_untrustedstring(ab
, context
->names
[i
].name
);
762 if (context
->names
[i
].ino
!= (unsigned long)-1)
763 audit_log_format(ab
, " inode=%lu dev=%02x:%02x mode=%#o"
764 " ouid=%d ogid=%d rdev=%02x:%02x",
765 context
->names
[i
].ino
,
766 MAJOR(context
->names
[i
].dev
),
767 MINOR(context
->names
[i
].dev
),
768 context
->names
[i
].mode
,
769 context
->names
[i
].uid
,
770 context
->names
[i
].gid
,
771 MAJOR(context
->names
[i
].rdev
),
772 MINOR(context
->names
[i
].rdev
));
777 /* Free a per-task audit context. Called from copy_process and
778 * __put_task_struct. */
779 void audit_free(struct task_struct
*tsk
)
781 struct audit_context
*context
;
784 context
= audit_get_context(tsk
, 0, 0);
787 if (likely(!context
))
790 /* Check for system calls that do not go through the exit
791 * function (e.g., exit_group), then free context block. */
792 if (context
->in_syscall
&& context
->auditable
&& context
->pid
!= audit_pid
)
793 audit_log_exit(context
);
795 audit_free_context(context
);
798 /* Compute a serial number for the audit record. Audit records are
799 * written to user-space as soon as they are generated, so a complete
800 * audit record may be written in several pieces. The timestamp of the
801 * record and this serial number are used by the user-space tools to
802 * determine which pieces belong to the same audit record. The
803 * (timestamp,serial) tuple is unique for each syscall and is live from
804 * syscall entry to syscall exit.
806 * Atomic values are only guaranteed to be 24-bit, so we count down.
808 * NOTE: Another possibility is to store the formatted records off the
809 * audit context (for those records that have a context), and emit them
810 * all at syscall exit. However, this could delay the reporting of
811 * significant errors until syscall exit (or never, if the system
813 static inline unsigned int audit_serial(void)
815 static atomic_t serial
= ATOMIC_INIT(0xffffff);
819 a
= atomic_read(&serial
);
820 if (atomic_dec_and_test(&serial
))
821 atomic_set(&serial
, 0xffffff);
822 b
= atomic_read(&serial
);
823 } while (b
!= a
- 1);
828 /* Fill in audit context at syscall entry. This only happens if the
829 * audit context was created when the task was created and the state or
830 * filters demand the audit context be built. If the state from the
831 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
832 * then the record will be written at syscall exit time (otherwise, it
833 * will only be written if another part of the kernel requests that it
835 void audit_syscall_entry(struct task_struct
*tsk
, int arch
, int major
,
836 unsigned long a1
, unsigned long a2
,
837 unsigned long a3
, unsigned long a4
)
839 struct audit_context
*context
= tsk
->audit_context
;
840 enum audit_state state
;
844 /* This happens only on certain architectures that make system
845 * calls in kernel_thread via the entry.S interface, instead of
846 * with direct calls. (If you are porting to a new
847 * architecture, hitting this condition can indicate that you
848 * got the _exit/_leave calls backward in entry.S.)
852 * ppc64 yes (see arch/ppc64/kernel/misc.S)
854 * This also happens with vm86 emulation in a non-nested manner
855 * (entries without exits), so this case must be caught.
857 if (context
->in_syscall
) {
858 struct audit_context
*newctx
;
860 #if defined(__NR_vm86) && defined(__NR_vm86old)
861 /* vm86 mode should only be entered once */
862 if (major
== __NR_vm86
|| major
== __NR_vm86old
)
867 "audit(:%d) pid=%d in syscall=%d;"
868 " entering syscall=%d\n",
869 context
->serial
, tsk
->pid
, context
->major
, major
);
871 newctx
= audit_alloc_context(context
->state
);
873 newctx
->previous
= context
;
875 tsk
->audit_context
= newctx
;
877 /* If we can't alloc a new context, the best we
878 * can do is to leak memory (any pending putname
879 * will be lost). The only other alternative is
880 * to abandon auditing. */
881 audit_zero_context(context
, context
->state
);
884 BUG_ON(context
->in_syscall
|| context
->name_count
);
889 context
->arch
= arch
;
890 context
->major
= major
;
891 context
->argv
[0] = a1
;
892 context
->argv
[1] = a2
;
893 context
->argv
[2] = a3
;
894 context
->argv
[3] = a4
;
896 state
= context
->state
;
897 if (state
== AUDIT_SETUP_CONTEXT
|| state
== AUDIT_BUILD_CONTEXT
)
898 state
= audit_filter_syscall(tsk
, context
, &audit_entlist
);
899 if (likely(state
== AUDIT_DISABLED
))
902 context
->serial
= audit_serial();
903 context
->ctime
= CURRENT_TIME
;
904 context
->in_syscall
= 1;
905 context
->auditable
= !!(state
== AUDIT_RECORD_CONTEXT
);
908 /* Tear down after system call. If the audit context has been marked as
909 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
910 * filtering, or because some other part of the kernel write an audit
911 * message), then write out the syscall information. In call cases,
912 * free the names stored from getname(). */
913 void audit_syscall_exit(struct task_struct
*tsk
, int valid
, long return_code
)
915 struct audit_context
*context
;
917 get_task_struct(tsk
);
919 context
= audit_get_context(tsk
, valid
, return_code
);
922 /* Not having a context here is ok, since the parent may have
923 * called __put_task_struct. */
924 if (likely(!context
))
927 if (context
->in_syscall
&& context
->auditable
&& context
->pid
!= audit_pid
)
928 audit_log_exit(context
);
930 context
->in_syscall
= 0;
931 context
->auditable
= 0;
933 if (context
->previous
) {
934 struct audit_context
*new_context
= context
->previous
;
935 context
->previous
= NULL
;
936 audit_free_context(context
);
937 tsk
->audit_context
= new_context
;
939 audit_free_names(context
);
940 audit_free_aux(context
);
941 audit_zero_context(context
, context
->state
);
942 tsk
->audit_context
= context
;
944 put_task_struct(tsk
);
947 /* Add a name to the list. Called from fs/namei.c:getname(). */
948 void audit_getname(const char *name
)
950 struct audit_context
*context
= current
->audit_context
;
952 if (!context
|| IS_ERR(name
) || !name
)
955 if (!context
->in_syscall
) {
957 printk(KERN_ERR
"%s:%d(:%d): ignoring getname(%p)\n",
958 __FILE__
, __LINE__
, context
->serial
, name
);
963 BUG_ON(context
->name_count
>= AUDIT_NAMES
);
964 context
->names
[context
->name_count
].name
= name
;
965 context
->names
[context
->name_count
].ino
= (unsigned long)-1;
966 ++context
->name_count
;
969 /* Intercept a putname request. Called from
970 * include/linux/fs.h:putname(). If we have stored the name from
971 * getname in the audit context, then we delay the putname until syscall
973 void audit_putname(const char *name
)
975 struct audit_context
*context
= current
->audit_context
;
978 if (!context
->in_syscall
) {
980 printk(KERN_ERR
"%s:%d(:%d): __putname(%p)\n",
981 __FILE__
, __LINE__
, context
->serial
, name
);
982 if (context
->name_count
) {
984 for (i
= 0; i
< context
->name_count
; i
++)
985 printk(KERN_ERR
"name[%d] = %p = %s\n", i
,
986 context
->names
[i
].name
,
987 context
->names
[i
].name
);
994 ++context
->put_count
;
995 if (context
->put_count
> context
->name_count
) {
996 printk(KERN_ERR
"%s:%d(:%d): major=%d"
997 " in_syscall=%d putname(%p) name_count=%d"
1000 context
->serial
, context
->major
,
1001 context
->in_syscall
, name
, context
->name_count
,
1002 context
->put_count
);
1009 /* Store the inode and device from a lookup. Called from
1010 * fs/namei.c:path_lookup(). */
1011 void audit_inode(const char *name
, const struct inode
*inode
)
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
].ino
= inode
->i_ino
;
1038 context
->names
[idx
].dev
= inode
->i_sb
->s_dev
;
1039 context
->names
[idx
].mode
= inode
->i_mode
;
1040 context
->names
[idx
].uid
= inode
->i_uid
;
1041 context
->names
[idx
].gid
= inode
->i_gid
;
1042 context
->names
[idx
].rdev
= inode
->i_rdev
;
1045 int audit_get_stamp(struct audit_context
*ctx
,
1046 struct timespec
*t
, unsigned int *serial
)
1049 t
->tv_sec
= ctx
->ctime
.tv_sec
;
1050 t
->tv_nsec
= ctx
->ctime
.tv_nsec
;
1051 *serial
= ctx
->serial
;
1058 int audit_set_loginuid(struct task_struct
*task
, uid_t loginuid
)
1060 if (task
->audit_context
) {
1061 struct audit_buffer
*ab
;
1063 ab
= audit_log_start(NULL
, AUDIT_LOGIN
);
1065 audit_log_format(ab
, "login pid=%d uid=%u "
1066 "old loginuid=%u new loginuid=%u",
1067 task
->pid
, task
->uid
,
1068 task
->audit_context
->loginuid
, loginuid
);
1071 task
->audit_context
->loginuid
= loginuid
;
1076 uid_t
audit_get_loginuid(struct audit_context
*ctx
)
1078 return ctx
? ctx
->loginuid
: -1;
1081 int audit_ipc_perms(unsigned long qbytes
, uid_t uid
, gid_t gid
, mode_t mode
)
1083 struct audit_aux_data_ipcctl
*ax
;
1084 struct audit_context
*context
= current
->audit_context
;
1086 if (likely(!context
))
1089 ax
= kmalloc(sizeof(*ax
), GFP_KERNEL
);
1093 ax
->qbytes
= qbytes
;
1098 ax
->d
.type
= AUDIT_IPC
;
1099 ax
->d
.next
= context
->aux
;
1100 context
->aux
= (void *)ax
;
1104 int audit_socketcall(int nargs
, unsigned long *args
)
1106 struct audit_aux_data_socketcall
*ax
;
1107 struct audit_context
*context
= current
->audit_context
;
1109 if (likely(!context
))
1112 ax
= kmalloc(sizeof(*ax
) + nargs
* sizeof(unsigned long), GFP_KERNEL
);
1117 memcpy(ax
->args
, args
, nargs
* sizeof(unsigned long));
1119 ax
->d
.type
= AUDIT_SOCKETCALL
;
1120 ax
->d
.next
= context
->aux
;
1121 context
->aux
= (void *)ax
;
1125 int audit_sockaddr(int len
, void *a
)
1127 struct audit_aux_data_sockaddr
*ax
;
1128 struct audit_context
*context
= current
->audit_context
;
1130 if (likely(!context
))
1133 ax
= kmalloc(sizeof(*ax
) + len
, GFP_KERNEL
);
1138 memcpy(ax
->a
, a
, len
);
1140 ax
->d
.type
= AUDIT_SOCKADDR
;
1141 ax
->d
.next
= context
->aux
;
1142 context
->aux
= (void *)ax
;
1146 int audit_avc_path(struct dentry
*dentry
, struct vfsmount
*mnt
)
1148 struct audit_aux_data_path
*ax
;
1149 struct audit_context
*context
= current
->audit_context
;
1151 if (likely(!context
))
1154 ax
= kmalloc(sizeof(*ax
), GFP_ATOMIC
);
1158 ax
->dentry
= dget(dentry
);
1159 ax
->mnt
= mntget(mnt
);
1161 ax
->d
.type
= AUDIT_AVC_PATH
;
1162 ax
->d
.next
= context
->aux
;
1163 context
->aux
= (void *)ax
;
1167 void audit_signal_info(int sig
, struct task_struct
*t
)
1169 extern pid_t audit_sig_pid
;
1170 extern uid_t audit_sig_uid
;
1172 if (unlikely(audit_pid
&& t
->pid
== audit_pid
)) {
1173 if (sig
== SIGTERM
|| sig
== SIGHUP
) {
1174 struct audit_context
*ctx
= current
->audit_context
;
1175 audit_sig_pid
= current
->pid
;
1177 audit_sig_uid
= ctx
->loginuid
;
1179 audit_sig_uid
= current
->uid
;