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/socket.h>
38 #include <linux/audit.h>
39 #include <linux/personality.h>
40 #include <linux/time.h>
41 #include <asm/unistd.h>
44 1 = put_count checking
45 2 = verbose put_count checking
49 /* No syscall auditing will take place unless audit_enabled != 0. */
50 extern int audit_enabled
;
52 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
53 * for saving names from getname(). */
54 #define AUDIT_NAMES 20
56 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
57 * audit_context from being used for nameless inodes from
59 #define AUDIT_NAMES_RESERVED 7
61 /* At task start time, the audit_state is set in the audit_context using
62 a per-task filter. At syscall entry, the audit_state is augmented by
63 the syscall filter. */
65 AUDIT_DISABLED
, /* Do not create per-task audit_context.
66 * No syscall-specific audit records can
68 AUDIT_SETUP_CONTEXT
, /* Create the per-task audit_context,
69 * but don't necessarily fill it in at
70 * syscall entry time (i.e., filter
72 AUDIT_BUILD_CONTEXT
, /* Create the per-task audit_context,
73 * and always fill it in at syscall
74 * entry time. This makes a full
75 * syscall record available if some
76 * other part of the kernel decides it
77 * should be recorded. */
78 AUDIT_RECORD_CONTEXT
/* Create the per-task audit_context,
79 * always fill it in at syscall entry
80 * time, and always write out the audit
81 * record at syscall exit time. */
84 /* When fs/namei.c:getname() is called, we store the pointer in name and
85 * we don't let putname() free it (instead we free all of the saved
86 * pointers at syscall exit time).
88 * Further, in fs/namei.c:path_lookup() we store the inode and device. */
99 struct audit_aux_data
{
100 struct audit_aux_data
*next
;
104 #define AUDIT_AUX_IPCPERM 0
106 struct audit_aux_data_ipcctl
{
107 struct audit_aux_data d
;
109 unsigned long qbytes
;
115 struct audit_aux_data_socketcall
{
116 struct audit_aux_data d
;
118 unsigned long args
[0];
121 struct audit_aux_data_sockaddr
{
122 struct audit_aux_data d
;
128 /* The per-task audit context. */
129 struct audit_context
{
130 int in_syscall
; /* 1 if task is in a syscall */
131 enum audit_state state
;
132 unsigned int serial
; /* serial number for record */
133 struct timespec ctime
; /* time of syscall entry */
134 uid_t loginuid
; /* login uid (identity) */
135 int major
; /* syscall number */
136 unsigned long argv
[4]; /* syscall arguments */
137 int return_valid
; /* return code is valid */
138 long return_code
;/* syscall return code */
139 int auditable
; /* 1 if record should be written */
141 struct audit_names names
[AUDIT_NAMES
];
142 struct audit_context
*previous
; /* For nested syscalls */
143 struct audit_aux_data
*aux
;
145 /* Save things to print about task_struct */
147 uid_t uid
, euid
, suid
, fsuid
;
148 gid_t gid
, egid
, sgid
, fsgid
;
149 unsigned long personality
;
159 /* There are three lists of rules -- one to search at task creation
160 * time, one to search at syscall entry time, and another to search at
161 * syscall exit time. */
162 static LIST_HEAD(audit_tsklist
);
163 static LIST_HEAD(audit_entlist
);
164 static LIST_HEAD(audit_extlist
);
167 struct list_head list
;
169 struct audit_rule rule
;
172 /* Check to see if two rules are identical. It is called from
173 * audit_del_rule during AUDIT_DEL. */
174 static int audit_compare_rule(struct audit_rule
*a
, struct audit_rule
*b
)
178 if (a
->flags
!= b
->flags
)
181 if (a
->action
!= b
->action
)
184 if (a
->field_count
!= b
->field_count
)
187 for (i
= 0; i
< a
->field_count
; i
++) {
188 if (a
->fields
[i
] != b
->fields
[i
]
189 || a
->values
[i
] != b
->values
[i
])
193 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++)
194 if (a
->mask
[i
] != b
->mask
[i
])
200 /* Note that audit_add_rule and audit_del_rule are called via
201 * audit_receive() in audit.c, and are protected by
202 * audit_netlink_sem. */
203 static inline int audit_add_rule(struct audit_entry
*entry
,
204 struct list_head
*list
)
206 if (entry
->rule
.flags
& AUDIT_PREPEND
) {
207 entry
->rule
.flags
&= ~AUDIT_PREPEND
;
208 list_add_rcu(&entry
->list
, list
);
210 list_add_tail_rcu(&entry
->list
, list
);
215 static void audit_free_rule(struct rcu_head
*head
)
217 struct audit_entry
*e
= container_of(head
, struct audit_entry
, rcu
);
221 /* Note that audit_add_rule and audit_del_rule are called via
222 * audit_receive() in audit.c, and are protected by
223 * audit_netlink_sem. */
224 static inline int audit_del_rule(struct audit_rule
*rule
,
225 struct list_head
*list
)
227 struct audit_entry
*e
;
229 /* Do not use the _rcu iterator here, since this is the only
230 * deletion routine. */
231 list_for_each_entry(e
, list
, list
) {
232 if (!audit_compare_rule(rule
, &e
->rule
)) {
233 list_del_rcu(&e
->list
);
234 call_rcu(&e
->rcu
, audit_free_rule
);
238 return -EFAULT
; /* No matching rule */
241 /* Copy rule from user-space to kernel-space. Called during
243 static int audit_copy_rule(struct audit_rule
*d
, struct audit_rule
*s
)
247 if (s
->action
!= AUDIT_NEVER
248 && s
->action
!= AUDIT_POSSIBLE
249 && s
->action
!= AUDIT_ALWAYS
)
251 if (s
->field_count
< 0 || s
->field_count
> AUDIT_MAX_FIELDS
)
255 d
->action
= s
->action
;
256 d
->field_count
= s
->field_count
;
257 for (i
= 0; i
< d
->field_count
; i
++) {
258 d
->fields
[i
] = s
->fields
[i
];
259 d
->values
[i
] = s
->values
[i
];
261 for (i
= 0; i
< AUDIT_BITMASK_SIZE
; i
++) d
->mask
[i
] = s
->mask
[i
];
265 int audit_receive_filter(int type
, int pid
, int uid
, int seq
, void *data
,
269 struct audit_entry
*entry
;
274 /* The *_rcu iterators not needed here because we are
275 always called with audit_netlink_sem held. */
276 list_for_each_entry(entry
, &audit_tsklist
, list
)
277 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
278 &entry
->rule
, sizeof(entry
->rule
));
279 list_for_each_entry(entry
, &audit_entlist
, list
)
280 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
281 &entry
->rule
, sizeof(entry
->rule
));
282 list_for_each_entry(entry
, &audit_extlist
, list
)
283 audit_send_reply(pid
, seq
, AUDIT_LIST
, 0, 1,
284 &entry
->rule
, sizeof(entry
->rule
));
285 audit_send_reply(pid
, seq
, AUDIT_LIST
, 1, 1, NULL
, 0);
288 if (!(entry
= kmalloc(sizeof(*entry
), GFP_KERNEL
)))
290 if (audit_copy_rule(&entry
->rule
, data
)) {
294 flags
= entry
->rule
.flags
;
295 if (!err
&& (flags
& AUDIT_PER_TASK
))
296 err
= audit_add_rule(entry
, &audit_tsklist
);
297 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
298 err
= audit_add_rule(entry
, &audit_entlist
);
299 if (!err
&& (flags
& AUDIT_AT_EXIT
))
300 err
= audit_add_rule(entry
, &audit_extlist
);
301 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
302 "auid %u added an audit rule\n", loginuid
);
305 flags
=((struct audit_rule
*)data
)->flags
;
306 if (!err
&& (flags
& AUDIT_PER_TASK
))
307 err
= audit_del_rule(data
, &audit_tsklist
);
308 if (!err
&& (flags
& AUDIT_AT_ENTRY
))
309 err
= audit_del_rule(data
, &audit_entlist
);
310 if (!err
&& (flags
& AUDIT_AT_EXIT
))
311 err
= audit_del_rule(data
, &audit_extlist
);
312 audit_log(NULL
, AUDIT_CONFIG_CHANGE
,
313 "auid %u removed an audit rule\n", loginuid
);
322 /* Compare a task_struct with an audit_rule. Return 1 on match, 0
324 static int audit_filter_rules(struct task_struct
*tsk
,
325 struct audit_rule
*rule
,
326 struct audit_context
*ctx
,
327 enum audit_state
*state
)
331 for (i
= 0; i
< rule
->field_count
; i
++) {
332 u32 field
= rule
->fields
[i
] & ~AUDIT_NEGATE
;
333 u32 value
= rule
->values
[i
];
338 result
= (tsk
->pid
== value
);
341 result
= (tsk
->uid
== value
);
344 result
= (tsk
->euid
== value
);
347 result
= (tsk
->suid
== value
);
350 result
= (tsk
->fsuid
== value
);
353 result
= (tsk
->gid
== value
);
356 result
= (tsk
->egid
== value
);
359 result
= (tsk
->sgid
== value
);
362 result
= (tsk
->fsgid
== value
);
365 result
= (tsk
->personality
== value
);
369 result
= (ctx
->arch
== value
);
373 if (ctx
&& ctx
->return_valid
)
374 result
= (ctx
->return_code
== value
);
377 if (ctx
&& ctx
->return_valid
)
378 result
= (ctx
->return_valid
== AUDITSC_SUCCESS
);
382 for (j
= 0; j
< ctx
->name_count
; j
++) {
383 if (MAJOR(ctx
->names
[j
].dev
)==value
) {
392 for (j
= 0; j
< ctx
->name_count
; j
++) {
393 if (MINOR(ctx
->names
[j
].dev
)==value
) {
402 for (j
= 0; j
< ctx
->name_count
; j
++) {
403 if (ctx
->names
[j
].ino
== value
) {
413 result
= (ctx
->loginuid
== value
);
420 result
= (ctx
->argv
[field
-AUDIT_ARG0
]==value
);
424 if (rule
->fields
[i
] & AUDIT_NEGATE
)
429 switch (rule
->action
) {
430 case AUDIT_NEVER
: *state
= AUDIT_DISABLED
; break;
431 case AUDIT_POSSIBLE
: *state
= AUDIT_BUILD_CONTEXT
; break;
432 case AUDIT_ALWAYS
: *state
= AUDIT_RECORD_CONTEXT
; break;
437 /* At process creation time, we can determine if system-call auditing is
438 * completely disabled for this task. Since we only have the task
439 * structure at this point, we can only check uid and gid.
441 static enum audit_state
audit_filter_task(struct task_struct
*tsk
)
443 struct audit_entry
*e
;
444 enum audit_state state
;
447 list_for_each_entry_rcu(e
, &audit_tsklist
, list
) {
448 if (audit_filter_rules(tsk
, &e
->rule
, NULL
, &state
)) {
454 return AUDIT_BUILD_CONTEXT
;
457 /* At syscall entry and exit time, this filter is called if the
458 * audit_state is not low enough that auditing cannot take place, but is
459 * also not high enough that we already know we have to write an audit
460 * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
462 static enum audit_state
audit_filter_syscall(struct task_struct
*tsk
,
463 struct audit_context
*ctx
,
464 struct list_head
*list
)
466 struct audit_entry
*e
;
467 enum audit_state state
;
468 int word
= AUDIT_WORD(ctx
->major
);
469 int bit
= AUDIT_BIT(ctx
->major
);
472 list_for_each_entry_rcu(e
, list
, list
) {
473 if ((e
->rule
.mask
[word
] & bit
) == bit
474 && audit_filter_rules(tsk
, &e
->rule
, ctx
, &state
)) {
480 return AUDIT_BUILD_CONTEXT
;
483 /* This should be called with task_lock() held. */
484 static inline struct audit_context
*audit_get_context(struct task_struct
*tsk
,
488 struct audit_context
*context
= tsk
->audit_context
;
490 if (likely(!context
))
492 context
->return_valid
= return_valid
;
493 context
->return_code
= return_code
;
495 if (context
->in_syscall
&& !context
->auditable
) {
496 enum audit_state state
;
497 state
= audit_filter_syscall(tsk
, context
, &audit_extlist
);
498 if (state
== AUDIT_RECORD_CONTEXT
)
499 context
->auditable
= 1;
502 context
->pid
= tsk
->pid
;
503 context
->uid
= tsk
->uid
;
504 context
->gid
= tsk
->gid
;
505 context
->euid
= tsk
->euid
;
506 context
->suid
= tsk
->suid
;
507 context
->fsuid
= tsk
->fsuid
;
508 context
->egid
= tsk
->egid
;
509 context
->sgid
= tsk
->sgid
;
510 context
->fsgid
= tsk
->fsgid
;
511 context
->personality
= tsk
->personality
;
512 tsk
->audit_context
= NULL
;
516 static inline void audit_free_names(struct audit_context
*context
)
521 if (context
->auditable
522 ||context
->put_count
+ context
->ino_count
!= context
->name_count
) {
523 printk(KERN_ERR
"audit.c:%d(:%d): major=%d in_syscall=%d"
524 " name_count=%d put_count=%d"
525 " ino_count=%d [NOT freeing]\n",
527 context
->serial
, context
->major
, context
->in_syscall
,
528 context
->name_count
, context
->put_count
,
530 for (i
= 0; i
< context
->name_count
; i
++)
531 printk(KERN_ERR
"names[%d] = %p = %s\n", i
,
532 context
->names
[i
].name
,
533 context
->names
[i
].name
);
539 context
->put_count
= 0;
540 context
->ino_count
= 0;
543 for (i
= 0; i
< context
->name_count
; i
++)
544 if (context
->names
[i
].name
)
545 __putname(context
->names
[i
].name
);
546 context
->name_count
= 0;
549 static inline void audit_free_aux(struct audit_context
*context
)
551 struct audit_aux_data
*aux
;
553 while ((aux
= context
->aux
)) {
554 context
->aux
= aux
->next
;
559 static inline void audit_zero_context(struct audit_context
*context
,
560 enum audit_state state
)
562 uid_t loginuid
= context
->loginuid
;
564 memset(context
, 0, sizeof(*context
));
565 context
->state
= state
;
566 context
->loginuid
= loginuid
;
569 static inline struct audit_context
*audit_alloc_context(enum audit_state state
)
571 struct audit_context
*context
;
573 if (!(context
= kmalloc(sizeof(*context
), GFP_KERNEL
)))
575 audit_zero_context(context
, state
);
579 /* Filter on the task information and allocate a per-task audit context
580 * if necessary. Doing so turns on system call auditing for the
581 * specified task. This is called from copy_process, so no lock is
583 int audit_alloc(struct task_struct
*tsk
)
585 struct audit_context
*context
;
586 enum audit_state state
;
588 if (likely(!audit_enabled
))
589 return 0; /* Return if not auditing. */
591 state
= audit_filter_task(tsk
);
592 if (likely(state
== AUDIT_DISABLED
))
595 if (!(context
= audit_alloc_context(state
))) {
596 audit_log_lost("out of memory in audit_alloc");
600 /* Preserve login uid */
601 context
->loginuid
= -1;
602 if (current
->audit_context
)
603 context
->loginuid
= current
->audit_context
->loginuid
;
605 tsk
->audit_context
= context
;
606 set_tsk_thread_flag(tsk
, TIF_SYSCALL_AUDIT
);
610 static inline void audit_free_context(struct audit_context
*context
)
612 struct audit_context
*previous
;
616 previous
= context
->previous
;
617 if (previous
|| (count
&& count
< 10)) {
619 printk(KERN_ERR
"audit(:%d): major=%d name_count=%d:"
620 " freeing multiple contexts (%d)\n",
621 context
->serial
, context
->major
,
622 context
->name_count
, count
);
624 audit_free_names(context
);
625 audit_free_aux(context
);
630 printk(KERN_ERR
"audit: freed %d contexts\n", count
);
633 static void audit_log_task_info(struct audit_buffer
*ab
)
635 char name
[sizeof(current
->comm
)];
636 struct mm_struct
*mm
= current
->mm
;
637 struct vm_area_struct
*vma
;
639 get_task_comm(name
, current
);
640 audit_log_format(ab
, " comm=%s", name
);
645 down_read(&mm
->mmap_sem
);
648 if ((vma
->vm_flags
& VM_EXECUTABLE
) &&
650 audit_log_d_path(ab
, "exe=",
651 vma
->vm_file
->f_dentry
,
652 vma
->vm_file
->f_vfsmnt
);
657 up_read(&mm
->mmap_sem
);
660 static void audit_log_exit(struct audit_context
*context
)
663 struct audit_buffer
*ab
;
665 ab
= audit_log_start(context
, AUDIT_SYSCALL
);
667 return; /* audit_panic has been called */
668 audit_log_format(ab
, "syscall=%d", context
->major
);
669 if (context
->personality
!= PER_LINUX
)
670 audit_log_format(ab
, " per=%lx", context
->personality
);
671 audit_log_format(ab
, " arch=%x", context
->arch
);
672 if (context
->return_valid
)
673 audit_log_format(ab
, " success=%s exit=%ld",
674 (context
->return_valid
==AUDITSC_SUCCESS
)?"yes":"no",
675 context
->return_code
);
677 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
678 " pid=%d loginuid=%d uid=%d gid=%d"
679 " euid=%d suid=%d fsuid=%d"
680 " egid=%d sgid=%d fsgid=%d",
690 context
->euid
, context
->suid
, context
->fsuid
,
691 context
->egid
, context
->sgid
, context
->fsgid
);
692 audit_log_task_info(ab
);
694 while (context
->aux
) {
695 struct audit_aux_data
*aux
;
699 ab
= audit_log_start(context
, aux
->type
);
701 continue; /* audit_panic has been called */
705 struct audit_aux_data_ipcctl
*axi
= (void *)aux
;
707 " qbytes=%lx iuid=%d igid=%d mode=%x",
708 axi
->qbytes
, axi
->uid
, axi
->gid
, axi
->mode
);
711 case AUDIT_SOCKETCALL
: {
713 struct audit_aux_data_socketcall
*axs
= (void *)aux
;
714 audit_log_format(ab
, "nargs=%d", axs
->nargs
);
715 for (i
=0; i
<axs
->nargs
; i
++)
716 audit_log_format(ab
, " a%d=%lx", i
, axs
->args
[i
]);
719 case AUDIT_SOCKADDR
: {
720 struct audit_aux_data_sockaddr
*axs
= (void *)aux
;
722 audit_log_format(ab
, "saddr=");
723 audit_log_hex(ab
, axs
->a
, axs
->len
);
728 context
->aux
= aux
->next
;
732 for (i
= 0; i
< context
->name_count
; i
++) {
733 ab
= audit_log_start(context
, AUDIT_PATH
);
735 continue; /* audit_panic has been called */
736 audit_log_format(ab
, "item=%d", i
);
737 if (context
->names
[i
].name
) {
738 audit_log_format(ab
, " name=");
739 audit_log_untrustedstring(ab
, context
->names
[i
].name
);
741 if (context
->names
[i
].ino
!= (unsigned long)-1)
742 audit_log_format(ab
, " inode=%lu dev=%02x:%02x mode=%#o"
743 " ouid=%d ogid=%d rdev=%02x:%02x",
744 context
->names
[i
].ino
,
745 MAJOR(context
->names
[i
].dev
),
746 MINOR(context
->names
[i
].dev
),
747 context
->names
[i
].mode
,
748 context
->names
[i
].uid
,
749 context
->names
[i
].gid
,
750 MAJOR(context
->names
[i
].rdev
),
751 MINOR(context
->names
[i
].rdev
));
756 /* Free a per-task audit context. Called from copy_process and
757 * __put_task_struct. */
758 void audit_free(struct task_struct
*tsk
)
760 struct audit_context
*context
;
763 context
= audit_get_context(tsk
, 0, 0);
766 if (likely(!context
))
769 /* Check for system calls that do not go through the exit
770 * function (e.g., exit_group), then free context block. */
771 if (context
->in_syscall
&& context
->auditable
)
772 audit_log_exit(context
);
774 audit_free_context(context
);
777 /* Compute a serial number for the audit record. Audit records are
778 * written to user-space as soon as they are generated, so a complete
779 * audit record may be written in several pieces. The timestamp of the
780 * record and this serial number are used by the user-space tools to
781 * determine which pieces belong to the same audit record. The
782 * (timestamp,serial) tuple is unique for each syscall and is live from
783 * syscall entry to syscall exit.
785 * Atomic values are only guaranteed to be 24-bit, so we count down.
787 * NOTE: Another possibility is to store the formatted records off the
788 * audit context (for those records that have a context), and emit them
789 * all at syscall exit. However, this could delay the reporting of
790 * significant errors until syscall exit (or never, if the system
792 static inline unsigned int audit_serial(void)
794 static atomic_t serial
= ATOMIC_INIT(0xffffff);
798 a
= atomic_read(&serial
);
799 if (atomic_dec_and_test(&serial
))
800 atomic_set(&serial
, 0xffffff);
801 b
= atomic_read(&serial
);
802 } while (b
!= a
- 1);
807 /* Fill in audit context at syscall entry. This only happens if the
808 * audit context was created when the task was created and the state or
809 * filters demand the audit context be built. If the state from the
810 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
811 * then the record will be written at syscall exit time (otherwise, it
812 * will only be written if another part of the kernel requests that it
814 void audit_syscall_entry(struct task_struct
*tsk
, int arch
, int major
,
815 unsigned long a1
, unsigned long a2
,
816 unsigned long a3
, unsigned long a4
)
818 struct audit_context
*context
= tsk
->audit_context
;
819 enum audit_state state
;
823 /* This happens only on certain architectures that make system
824 * calls in kernel_thread via the entry.S interface, instead of
825 * with direct calls. (If you are porting to a new
826 * architecture, hitting this condition can indicate that you
827 * got the _exit/_leave calls backward in entry.S.)
831 * ppc64 yes (see arch/ppc64/kernel/misc.S)
833 * This also happens with vm86 emulation in a non-nested manner
834 * (entries without exits), so this case must be caught.
836 if (context
->in_syscall
) {
837 struct audit_context
*newctx
;
839 #if defined(__NR_vm86) && defined(__NR_vm86old)
840 /* vm86 mode should only be entered once */
841 if (major
== __NR_vm86
|| major
== __NR_vm86old
)
846 "audit(:%d) pid=%d in syscall=%d;"
847 " entering syscall=%d\n",
848 context
->serial
, tsk
->pid
, context
->major
, major
);
850 newctx
= audit_alloc_context(context
->state
);
852 newctx
->previous
= context
;
854 tsk
->audit_context
= newctx
;
856 /* If we can't alloc a new context, the best we
857 * can do is to leak memory (any pending putname
858 * will be lost). The only other alternative is
859 * to abandon auditing. */
860 audit_zero_context(context
, context
->state
);
863 BUG_ON(context
->in_syscall
|| context
->name_count
);
868 context
->arch
= arch
;
869 context
->major
= major
;
870 context
->argv
[0] = a1
;
871 context
->argv
[1] = a2
;
872 context
->argv
[2] = a3
;
873 context
->argv
[3] = a4
;
875 state
= context
->state
;
876 if (state
== AUDIT_SETUP_CONTEXT
|| state
== AUDIT_BUILD_CONTEXT
)
877 state
= audit_filter_syscall(tsk
, context
, &audit_entlist
);
878 if (likely(state
== AUDIT_DISABLED
))
881 context
->serial
= audit_serial();
882 context
->ctime
= CURRENT_TIME
;
883 context
->in_syscall
= 1;
884 context
->auditable
= !!(state
== AUDIT_RECORD_CONTEXT
);
887 /* Tear down after system call. If the audit context has been marked as
888 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
889 * filtering, or because some other part of the kernel write an audit
890 * message), then write out the syscall information. In call cases,
891 * free the names stored from getname(). */
892 void audit_syscall_exit(struct task_struct
*tsk
, int valid
, long return_code
)
894 struct audit_context
*context
;
896 get_task_struct(tsk
);
898 context
= audit_get_context(tsk
, valid
, return_code
);
901 /* Not having a context here is ok, since the parent may have
902 * called __put_task_struct. */
903 if (likely(!context
))
906 if (context
->in_syscall
&& context
->auditable
)
907 audit_log_exit(context
);
909 context
->in_syscall
= 0;
910 context
->auditable
= 0;
912 if (context
->previous
) {
913 struct audit_context
*new_context
= context
->previous
;
914 context
->previous
= NULL
;
915 audit_free_context(context
);
916 tsk
->audit_context
= new_context
;
918 audit_free_names(context
);
919 audit_free_aux(context
);
920 audit_zero_context(context
, context
->state
);
921 tsk
->audit_context
= context
;
923 put_task_struct(tsk
);
926 /* Add a name to the list. Called from fs/namei.c:getname(). */
927 void audit_getname(const char *name
)
929 struct audit_context
*context
= current
->audit_context
;
931 if (!context
|| IS_ERR(name
) || !name
)
934 if (!context
->in_syscall
) {
936 printk(KERN_ERR
"%s:%d(:%d): ignoring getname(%p)\n",
937 __FILE__
, __LINE__
, context
->serial
, name
);
942 BUG_ON(context
->name_count
>= AUDIT_NAMES
);
943 context
->names
[context
->name_count
].name
= name
;
944 context
->names
[context
->name_count
].ino
= (unsigned long)-1;
945 ++context
->name_count
;
948 /* Intercept a putname request. Called from
949 * include/linux/fs.h:putname(). If we have stored the name from
950 * getname in the audit context, then we delay the putname until syscall
952 void audit_putname(const char *name
)
954 struct audit_context
*context
= current
->audit_context
;
957 if (!context
->in_syscall
) {
959 printk(KERN_ERR
"%s:%d(:%d): __putname(%p)\n",
960 __FILE__
, __LINE__
, context
->serial
, name
);
961 if (context
->name_count
) {
963 for (i
= 0; i
< context
->name_count
; i
++)
964 printk(KERN_ERR
"name[%d] = %p = %s\n", i
,
965 context
->names
[i
].name
,
966 context
->names
[i
].name
);
973 ++context
->put_count
;
974 if (context
->put_count
> context
->name_count
) {
975 printk(KERN_ERR
"%s:%d(:%d): major=%d"
976 " in_syscall=%d putname(%p) name_count=%d"
979 context
->serial
, context
->major
,
980 context
->in_syscall
, name
, context
->name_count
,
988 /* Store the inode and device from a lookup. Called from
989 * fs/namei.c:path_lookup(). */
990 void audit_inode(const char *name
, const struct inode
*inode
)
993 struct audit_context
*context
= current
->audit_context
;
995 if (!context
->in_syscall
)
997 if (context
->name_count
998 && context
->names
[context
->name_count
-1].name
999 && context
->names
[context
->name_count
-1].name
== name
)
1000 idx
= context
->name_count
- 1;
1001 else if (context
->name_count
> 1
1002 && context
->names
[context
->name_count
-2].name
1003 && context
->names
[context
->name_count
-2].name
== name
)
1004 idx
= context
->name_count
- 2;
1006 /* FIXME: how much do we care about inodes that have no
1007 * associated name? */
1008 if (context
->name_count
>= AUDIT_NAMES
- AUDIT_NAMES_RESERVED
)
1010 idx
= context
->name_count
++;
1011 context
->names
[idx
].name
= NULL
;
1013 ++context
->ino_count
;
1016 context
->names
[idx
].ino
= inode
->i_ino
;
1017 context
->names
[idx
].dev
= inode
->i_sb
->s_dev
;
1018 context
->names
[idx
].mode
= inode
->i_mode
;
1019 context
->names
[idx
].uid
= inode
->i_uid
;
1020 context
->names
[idx
].gid
= inode
->i_gid
;
1021 context
->names
[idx
].rdev
= inode
->i_rdev
;
1024 int audit_get_stamp(struct audit_context
*ctx
,
1025 struct timespec
*t
, unsigned int *serial
)
1028 t
->tv_sec
= ctx
->ctime
.tv_sec
;
1029 t
->tv_nsec
= ctx
->ctime
.tv_nsec
;
1030 *serial
= ctx
->serial
;
1037 int audit_set_loginuid(struct task_struct
*task
, uid_t loginuid
)
1039 if (task
->audit_context
) {
1040 struct audit_buffer
*ab
;
1042 ab
= audit_log_start(NULL
, AUDIT_LOGIN
);
1044 audit_log_format(ab
, "login pid=%d uid=%u "
1045 "old loginuid=%u new loginuid=%u",
1046 task
->pid
, task
->uid
,
1047 task
->audit_context
->loginuid
, loginuid
);
1050 task
->audit_context
->loginuid
= loginuid
;
1055 uid_t
audit_get_loginuid(struct audit_context
*ctx
)
1057 return ctx
? ctx
->loginuid
: -1;
1060 int audit_ipc_perms(unsigned long qbytes
, uid_t uid
, gid_t gid
, mode_t mode
)
1062 struct audit_aux_data_ipcctl
*ax
;
1063 struct audit_context
*context
= current
->audit_context
;
1065 if (likely(!context
))
1068 ax
= kmalloc(sizeof(*ax
), GFP_KERNEL
);
1072 ax
->qbytes
= qbytes
;
1077 ax
->d
.type
= AUDIT_IPC
;
1078 ax
->d
.next
= context
->aux
;
1079 context
->aux
= (void *)ax
;
1083 int audit_socketcall(int nargs
, unsigned long *args
)
1085 struct audit_aux_data_socketcall
*ax
;
1086 struct audit_context
*context
= current
->audit_context
;
1088 if (likely(!context
))
1091 ax
= kmalloc(sizeof(*ax
) + nargs
* sizeof(unsigned long), GFP_KERNEL
);
1096 memcpy(ax
->args
, args
, nargs
* sizeof(unsigned long));
1098 ax
->d
.type
= AUDIT_SOCKETCALL
;
1099 ax
->d
.next
= context
->aux
;
1100 context
->aux
= (void *)ax
;
1104 int audit_sockaddr(int len
, void *a
)
1106 struct audit_aux_data_sockaddr
*ax
;
1107 struct audit_context
*context
= current
->audit_context
;
1109 if (likely(!context
))
1112 ax
= kmalloc(sizeof(*ax
) + len
, GFP_KERNEL
);
1117 memcpy(ax
->a
, a
, len
);
1119 ax
->d
.type
= AUDIT_SOCKADDR
;
1120 ax
->d
.next
= context
->aux
;
1121 context
->aux
= (void *)ax
;
1125 void audit_signal_info(int sig
, struct task_struct
*t
)
1127 extern pid_t audit_sig_pid
;
1128 extern uid_t audit_sig_uid
;
1129 extern int audit_pid
;
1131 if (unlikely(audit_pid
&& t
->pid
== audit_pid
)) {
1132 if (sig
== SIGTERM
|| sig
== SIGHUP
) {
1133 struct audit_context
*ctx
= current
->audit_context
;
1134 audit_sig_pid
= current
->pid
;
1136 audit_sig_uid
= ctx
->loginuid
;
1138 audit_sig_uid
= current
->uid
;