1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Security plug functions
5 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
6 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
8 * Copyright (C) 2016 Mellanox Technologies
11 #define pr_fmt(fmt) "LSM: " fmt
13 #include <linux/bpf.h>
14 #include <linux/capability.h>
15 #include <linux/dcache.h>
16 #include <linux/export.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/kernel_read_file.h>
20 #include <linux/lsm_hooks.h>
21 #include <linux/integrity.h>
22 #include <linux/ima.h>
23 #include <linux/evm.h>
24 #include <linux/fsnotify.h>
25 #include <linux/mman.h>
26 #include <linux/mount.h>
27 #include <linux/personality.h>
28 #include <linux/backing-dev.h>
29 #include <linux/string.h>
30 #include <linux/msg.h>
34 #define MAX_LSM_EVM_XATTR 2
36 /* How many LSMs were built into the kernel? */
37 #define LSM_COUNT (__end_lsm_info - __start_lsm_info)
40 * These are descriptions of the reasons that can be passed to the
41 * security_locked_down() LSM hook. Placing this array here allows
42 * all security modules to use the same descriptions for auditing
45 const char *const lockdown_reasons
[LOCKDOWN_CONFIDENTIALITY_MAX
+1] = {
46 [LOCKDOWN_NONE
] = "none",
47 [LOCKDOWN_MODULE_SIGNATURE
] = "unsigned module loading",
48 [LOCKDOWN_DEV_MEM
] = "/dev/mem,kmem,port",
49 [LOCKDOWN_EFI_TEST
] = "/dev/efi_test access",
50 [LOCKDOWN_KEXEC
] = "kexec of unsigned images",
51 [LOCKDOWN_HIBERNATION
] = "hibernation",
52 [LOCKDOWN_PCI_ACCESS
] = "direct PCI access",
53 [LOCKDOWN_IOPORT
] = "raw io port access",
54 [LOCKDOWN_MSR
] = "raw MSR access",
55 [LOCKDOWN_ACPI_TABLES
] = "modifying ACPI tables",
56 [LOCKDOWN_PCMCIA_CIS
] = "direct PCMCIA CIS storage",
57 [LOCKDOWN_TIOCSSERIAL
] = "reconfiguration of serial port IO",
58 [LOCKDOWN_MODULE_PARAMETERS
] = "unsafe module parameters",
59 [LOCKDOWN_MMIOTRACE
] = "unsafe mmio",
60 [LOCKDOWN_DEBUGFS
] = "debugfs access",
61 [LOCKDOWN_XMON_WR
] = "xmon write access",
62 [LOCKDOWN_BPF_WRITE_USER
] = "use of bpf to write user RAM",
63 [LOCKDOWN_KGDB
] = "KDB or KGDB access",
64 [LOCKDOWN_INTEGRITY_MAX
] = "integrity",
65 [LOCKDOWN_KCORE
] = "/proc/kcore access",
66 [LOCKDOWN_KPROBES
] = "use of kprobes",
67 [LOCKDOWN_BPF_READ_KERNEL
] = "use of bpf to read kernel RAM",
68 [LOCKDOWN_PERF
] = "unsafe use of perf",
69 [LOCKDOWN_TRACEFS
] = "use of tracefs",
70 [LOCKDOWN_XMON_RW
] = "xmon read and write access",
71 [LOCKDOWN_XFRM_SECRET
] = "xfrm SA secret",
72 [LOCKDOWN_CONFIDENTIALITY_MAX
] = "confidentiality",
75 struct security_hook_heads security_hook_heads __lsm_ro_after_init
;
76 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain
);
78 static struct kmem_cache
*lsm_file_cache
;
79 static struct kmem_cache
*lsm_inode_cache
;
84 * The task blob includes the "display" slot used for
85 * chosing which module presents contexts.
87 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init
= {
88 .lbs_task
= sizeof(int),
91 /* Boot-time LSM user choice */
92 static __initdata
const char *chosen_lsm_order
;
93 static __initdata
const char *chosen_major_lsm
;
95 static __initconst
const char * const builtin_lsm_order
= CONFIG_LSM
;
97 /* Ordered list of LSMs to initialize. */
98 static __initdata
struct lsm_info
**ordered_lsms
;
99 static __initdata
struct lsm_info
*exclusive
;
101 static __initdata
bool debug
;
102 #define init_debug(...) \
105 pr_info(__VA_ARGS__); \
108 static bool __init
is_enabled(struct lsm_info
*lsm
)
113 return *lsm
->enabled
;
116 /* Mark an LSM's enabled flag. */
117 static int lsm_enabled_true __initdata
= 1;
118 static int lsm_enabled_false __initdata
= 0;
119 static void __init
set_enabled(struct lsm_info
*lsm
, bool enabled
)
122 * When an LSM hasn't configured an enable variable, we can use
123 * a hard-coded location for storing the default enabled state.
127 lsm
->enabled
= &lsm_enabled_true
;
129 lsm
->enabled
= &lsm_enabled_false
;
130 } else if (lsm
->enabled
== &lsm_enabled_true
) {
132 lsm
->enabled
= &lsm_enabled_false
;
133 } else if (lsm
->enabled
== &lsm_enabled_false
) {
135 lsm
->enabled
= &lsm_enabled_true
;
137 *lsm
->enabled
= enabled
;
141 /* Is an LSM already listed in the ordered LSMs list? */
142 static bool __init
exists_ordered_lsm(struct lsm_info
*lsm
)
144 struct lsm_info
**check
;
146 for (check
= ordered_lsms
; *check
; check
++)
153 /* Append an LSM to the list of ordered LSMs to initialize. */
154 static int last_lsm __initdata
;
155 static void __init
append_ordered_lsm(struct lsm_info
*lsm
, const char *from
)
157 /* Ignore duplicate selections. */
158 if (exists_ordered_lsm(lsm
))
161 if (WARN(last_lsm
== LSM_COUNT
, "%s: out of LSM slots!?\n", from
))
164 /* Enable this LSM, if it is not already set. */
166 lsm
->enabled
= &lsm_enabled_true
;
167 ordered_lsms
[last_lsm
++] = lsm
;
169 init_debug("%s ordering: %s (%sabled)\n", from
, lsm
->name
,
170 is_enabled(lsm
) ? "en" : "dis");
173 /* Is an LSM allowed to be initialized? */
174 static bool __init
lsm_allowed(struct lsm_info
*lsm
)
176 /* Skip if the LSM is disabled. */
177 if (!is_enabled(lsm
))
180 /* Not allowed if another exclusive LSM already initialized. */
181 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && exclusive
) {
182 init_debug("exclusive disabled: %s\n", lsm
->name
);
189 static void __init
lsm_set_blob_size(int *need
, int *lbs
)
200 static void __init
lsm_set_blob_sizes(struct lsm_blob_sizes
*needed
)
205 lsm_set_blob_size(&needed
->lbs_cred
, &blob_sizes
.lbs_cred
);
206 lsm_set_blob_size(&needed
->lbs_file
, &blob_sizes
.lbs_file
);
208 * The inode blob gets an rcu_head in addition to
209 * what the modules might need.
211 if (needed
->lbs_inode
&& blob_sizes
.lbs_inode
== 0)
212 blob_sizes
.lbs_inode
= sizeof(struct rcu_head
);
213 lsm_set_blob_size(&needed
->lbs_inode
, &blob_sizes
.lbs_inode
);
214 lsm_set_blob_size(&needed
->lbs_ipc
, &blob_sizes
.lbs_ipc
);
215 lsm_set_blob_size(&needed
->lbs_msg_msg
, &blob_sizes
.lbs_msg_msg
);
216 lsm_set_blob_size(&needed
->lbs_superblock
, &blob_sizes
.lbs_superblock
);
217 lsm_set_blob_size(&needed
->lbs_sock
, &blob_sizes
.lbs_sock
);
218 lsm_set_blob_size(&needed
->lbs_task
, &blob_sizes
.lbs_task
);
221 /* Prepare LSM for initialization. */
222 static void __init
prepare_lsm(struct lsm_info
*lsm
)
224 int enabled
= lsm_allowed(lsm
);
226 /* Record enablement (to handle any following exclusive LSMs). */
227 set_enabled(lsm
, enabled
);
229 /* If enabled, do pre-initialization work. */
231 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && !exclusive
) {
233 init_debug("exclusive chosen: %s\n", lsm
->name
);
236 lsm_set_blob_sizes(lsm
->blobs
);
240 /* Initialize a given LSM, if it is enabled. */
241 static void __init
initialize_lsm(struct lsm_info
*lsm
)
243 if (is_enabled(lsm
)) {
246 init_debug("initializing %s\n", lsm
->name
);
248 WARN(ret
, "%s failed to initialize: %d\n", lsm
->name
, ret
);
252 /* Populate ordered LSMs list from comma-separated LSM name list. */
253 static void __init
ordered_lsm_parse(const char *order
, const char *origin
)
255 struct lsm_info
*lsm
;
256 char *sep
, *name
, *next
;
258 /* LSM_ORDER_FIRST is always first. */
259 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
260 if (lsm
->order
== LSM_ORDER_FIRST
)
261 append_ordered_lsm(lsm
, "first");
264 /* Process "security=", if given. */
265 if (chosen_major_lsm
) {
266 struct lsm_info
*major
;
269 * To match the original "security=" behavior, this
270 * explicitly does NOT fallback to another Legacy Major
271 * if the selected one was separately disabled: disable
272 * all non-matching Legacy Major LSMs.
274 for (major
= __start_lsm_info
; major
< __end_lsm_info
;
276 if ((major
->flags
& LSM_FLAG_LEGACY_MAJOR
) &&
277 strcmp(major
->name
, chosen_major_lsm
) != 0) {
278 set_enabled(major
, false);
279 init_debug("security=%s disabled: %s\n",
280 chosen_major_lsm
, major
->name
);
285 sep
= kstrdup(order
, GFP_KERNEL
);
287 /* Walk the list, looking for matching LSMs. */
288 while ((name
= strsep(&next
, ",")) != NULL
) {
291 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
292 if (lsm
->order
== LSM_ORDER_MUTABLE
&&
293 strcmp(lsm
->name
, name
) == 0) {
294 append_ordered_lsm(lsm
, origin
);
300 init_debug("%s ignored: %s\n", origin
, name
);
303 /* Process "security=", if given. */
304 if (chosen_major_lsm
) {
305 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
306 if (exists_ordered_lsm(lsm
))
308 if (strcmp(lsm
->name
, chosen_major_lsm
) == 0)
309 append_ordered_lsm(lsm
, "security=");
313 /* Disable all LSMs not in the ordered list. */
314 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
315 if (exists_ordered_lsm(lsm
))
317 set_enabled(lsm
, false);
318 init_debug("%s disabled: %s\n", origin
, lsm
->name
);
324 static void __init
lsm_early_cred(struct cred
*cred
);
325 static void __init
lsm_early_task(struct task_struct
*task
);
327 static int lsm_append(const char *new, char **result
);
329 static void __init
ordered_lsm_init(void)
331 struct lsm_info
**lsm
;
333 ordered_lsms
= kcalloc(LSM_COUNT
+ 1, sizeof(*ordered_lsms
),
336 if (chosen_lsm_order
) {
337 if (chosen_major_lsm
) {
338 pr_info("security= is ignored because it is superseded by lsm=\n");
339 chosen_major_lsm
= NULL
;
341 ordered_lsm_parse(chosen_lsm_order
, "cmdline");
343 ordered_lsm_parse(builtin_lsm_order
, "builtin");
345 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
348 init_debug("cred blob size = %d\n", blob_sizes
.lbs_cred
);
349 init_debug("file blob size = %d\n", blob_sizes
.lbs_file
);
350 init_debug("inode blob size = %d\n", blob_sizes
.lbs_inode
);
351 init_debug("ipc blob size = %d\n", blob_sizes
.lbs_ipc
);
352 init_debug("msg_msg blob size = %d\n", blob_sizes
.lbs_msg_msg
);
353 init_debug("superblock blob size = %d\n", blob_sizes
.lbs_superblock
);
354 init_debug("sock blob size = %d\n", blob_sizes
.lbs_sock
);
355 init_debug("task blob size = %d\n", blob_sizes
.lbs_task
);
356 init_debug("lsmblob size = %zu\n", sizeof(struct lsmblob
));
359 * Create any kmem_caches needed for blobs
361 if (blob_sizes
.lbs_file
)
362 lsm_file_cache
= kmem_cache_create("lsm_file_cache",
363 blob_sizes
.lbs_file
, 0,
365 if (blob_sizes
.lbs_inode
)
366 lsm_inode_cache
= kmem_cache_create("lsm_inode_cache",
367 blob_sizes
.lbs_inode
, 0,
370 lsm_early_cred((struct cred
*) current
->cred
);
371 lsm_early_task(current
);
372 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
373 initialize_lsm(*lsm
);
378 int __init
early_security_init(void)
381 struct hlist_head
*list
= (struct hlist_head
*) &security_hook_heads
;
382 struct lsm_info
*lsm
;
384 for (i
= 0; i
< sizeof(security_hook_heads
) / sizeof(struct hlist_head
);
386 INIT_HLIST_HEAD(&list
[i
]);
388 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
390 lsm
->enabled
= &lsm_enabled_true
;
399 * security_init - initializes the security framework
401 * This should be called early in the kernel initialization sequence.
403 int __init
security_init(void)
405 struct lsm_info
*lsm
;
407 pr_info("Security Framework initializing\n");
410 * Append the names of the early LSM modules now that kmalloc() is
413 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
415 lsm_append(lsm
->name
, &lsm_names
);
418 /* Load LSMs in specified order. */
424 /* Save user chosen LSM */
425 static int __init
choose_major_lsm(char *str
)
427 chosen_major_lsm
= str
;
430 __setup("security=", choose_major_lsm
);
432 /* Explicitly choose LSM initialization order. */
433 static int __init
choose_lsm_order(char *str
)
435 chosen_lsm_order
= str
;
438 __setup("lsm=", choose_lsm_order
);
440 /* Enable LSM order debugging. */
441 static int __init
enable_debug(char *str
)
446 __setup("lsm.debug", enable_debug
);
448 static bool match_last_lsm(const char *list
, const char *lsm
)
452 if (WARN_ON(!list
|| !lsm
))
454 last
= strrchr(list
, ',');
456 /* Pass the comma, strcmp() will check for '\0' */
460 return !strcmp(last
, lsm
);
463 static int lsm_append(const char *new, char **result
)
467 if (*result
== NULL
) {
468 *result
= kstrdup(new, GFP_KERNEL
);
472 /* Check if it is the last registered name */
473 if (match_last_lsm(*result
, new))
475 cp
= kasprintf(GFP_KERNEL
, "%s,%s", *result
, new);
485 * Current index to use while initializing the lsmblob secid list.
486 * Pointers to the LSM id structures for local use.
488 static int lsm_slot __lsm_ro_after_init
;
489 static struct lsm_id
*lsm_slotlist
[LSMBLOB_ENTRIES
] __lsm_ro_after_init
;
492 * security_lsm_slot_name - Get the name of the security module in a slot
493 * @slot: index into the "display" slot list.
495 * Provide the name of the security module associated with
498 * If @slot is LSMBLOB_INVALID return the value
499 * for slot 0 if it has been set, otherwise NULL.
501 * Returns a pointer to the name string or NULL.
503 const char *security_lsm_slot_name(int slot
)
505 if (slot
== LSMBLOB_INVALID
)
507 else if (slot
>= LSMBLOB_ENTRIES
|| slot
< 0)
510 if (lsm_slotlist
[slot
] == NULL
)
512 return lsm_slotlist
[slot
]->lsm
;
516 * security_add_hooks - Add a modules hooks to the hook lists.
517 * @hooks: the hooks to add
518 * @count: the number of hooks to add
519 * @lsmid: the the identification information for the security module
521 * Each LSM has to register its hooks with the infrastructure.
522 * If the LSM is using hooks that export secids allocate a slot
523 * for it in the lsmblob.
525 void __init
security_add_hooks(struct security_hook_list
*hooks
, int count
,
526 struct lsm_id
*lsmid
)
530 if (lsmid
->slot
== LSMBLOB_NEEDED
) {
531 if (lsm_slot
>= LSMBLOB_ENTRIES
)
532 panic("%s Too many LSMs registered.\n", __func__
);
533 lsm_slotlist
[lsm_slot
] = lsmid
;
534 lsmid
->slot
= lsm_slot
++;
535 init_debug("%s assigned lsmblob slot %d\n", lsmid
->lsm
,
539 for (i
= 0; i
< count
; i
++) {
540 hooks
[i
].lsmid
= lsmid
;
541 hlist_add_tail_rcu(&hooks
[i
].list
, hooks
[i
].head
);
545 * Don't try to append during early_security_init(), we'll come back
546 * and fix this up afterwards.
548 if (slab_is_available()) {
549 if (lsm_append(lsmid
->lsm
, &lsm_names
) < 0)
550 panic("%s - Cannot get early memory.\n", __func__
);
554 int call_blocking_lsm_notifier(enum lsm_event event
, void *data
)
556 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain
,
559 EXPORT_SYMBOL(call_blocking_lsm_notifier
);
561 int register_blocking_lsm_notifier(struct notifier_block
*nb
)
563 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain
,
566 EXPORT_SYMBOL(register_blocking_lsm_notifier
);
568 int unregister_blocking_lsm_notifier(struct notifier_block
*nb
)
570 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain
,
573 EXPORT_SYMBOL(unregister_blocking_lsm_notifier
);
576 * lsm_cred_alloc - allocate a composite cred blob
577 * @cred: the cred that needs a blob
578 * @gfp: allocation type
580 * Allocate the cred blob for all the modules
582 * Returns 0, or -ENOMEM if memory can't be allocated.
584 static int lsm_cred_alloc(struct cred
*cred
, gfp_t gfp
)
586 if (blob_sizes
.lbs_cred
== 0) {
587 cred
->security
= NULL
;
591 cred
->security
= kzalloc(blob_sizes
.lbs_cred
, gfp
);
592 if (cred
->security
== NULL
)
598 * lsm_early_cred - during initialization allocate a composite cred blob
599 * @cred: the cred that needs a blob
601 * Allocate the cred blob for all the modules
603 static void __init
lsm_early_cred(struct cred
*cred
)
605 int rc
= lsm_cred_alloc(cred
, GFP_KERNEL
);
608 panic("%s: Early cred alloc failed.\n", __func__
);
612 * lsm_file_alloc - allocate a composite file blob
613 * @file: the file that needs a blob
615 * Allocate the file blob for all the modules
617 * Returns 0, or -ENOMEM if memory can't be allocated.
619 static int lsm_file_alloc(struct file
*file
)
621 if (!lsm_file_cache
) {
622 file
->f_security
= NULL
;
626 file
->f_security
= kmem_cache_zalloc(lsm_file_cache
, GFP_KERNEL
);
627 if (file
->f_security
== NULL
)
633 * lsm_inode_alloc - allocate a composite inode blob
634 * @inode: the inode that needs a blob
636 * Allocate the inode blob for all the modules
638 * Returns 0, or -ENOMEM if memory can't be allocated.
640 int lsm_inode_alloc(struct inode
*inode
)
642 if (!lsm_inode_cache
) {
643 inode
->i_security
= NULL
;
647 inode
->i_security
= kmem_cache_zalloc(lsm_inode_cache
, GFP_NOFS
);
648 if (inode
->i_security
== NULL
)
654 * lsm_task_alloc - allocate a composite task blob
655 * @task: the task that needs a blob
657 * Allocate the task blob for all the modules
659 * Returns 0, or -ENOMEM if memory can't be allocated.
661 static int lsm_task_alloc(struct task_struct
*task
)
665 if (blob_sizes
.lbs_task
== 0) {
666 task
->security
= NULL
;
670 task
->security
= kzalloc(blob_sizes
.lbs_task
, GFP_KERNEL
);
671 if (task
->security
== NULL
)
675 * The start of the task blob contains the "display" LSM slot number.
676 * Start with it set to the invalid slot number, indicating that the
677 * default first registered LSM be displayed.
679 display
= task
->security
;
680 *display
= LSMBLOB_INVALID
;
686 * lsm_ipc_alloc - allocate a composite ipc blob
687 * @kip: the ipc that needs a blob
689 * Allocate the ipc blob for all the modules
691 * Returns 0, or -ENOMEM if memory can't be allocated.
693 static int lsm_ipc_alloc(struct kern_ipc_perm
*kip
)
695 if (blob_sizes
.lbs_ipc
== 0) {
696 kip
->security
= NULL
;
700 kip
->security
= kzalloc(blob_sizes
.lbs_ipc
, GFP_KERNEL
);
701 if (kip
->security
== NULL
)
707 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
708 * @mp: the msg_msg that needs a blob
710 * Allocate the ipc blob for all the modules
712 * Returns 0, or -ENOMEM if memory can't be allocated.
714 static int lsm_msg_msg_alloc(struct msg_msg
*mp
)
716 if (blob_sizes
.lbs_msg_msg
== 0) {
721 mp
->security
= kzalloc(blob_sizes
.lbs_msg_msg
, GFP_KERNEL
);
722 if (mp
->security
== NULL
)
728 * lsm_sock_alloc - allocate a composite sock blob
729 * @sock: the sock that needs a blob
730 * @priority: allocation mode
732 * Allocate the sock blob for all the modules
734 * Returns 0, or -ENOMEM if memory can't be allocated.
736 static int lsm_sock_alloc(struct sock
*sock
, gfp_t priority
)
738 if (blob_sizes
.lbs_sock
== 0) {
739 sock
->sk_security
= NULL
;
743 sock
->sk_security
= kzalloc(blob_sizes
.lbs_sock
, priority
);
744 if (sock
->sk_security
== NULL
)
750 * lsm_early_task - during initialization allocate a composite task blob
751 * @task: the task that needs a blob
753 * Allocate the task blob for all the modules
755 static void __init
lsm_early_task(struct task_struct
*task
)
757 int rc
= lsm_task_alloc(task
);
760 panic("%s: Early task alloc failed.\n", __func__
);
764 * append_ctx - append a lsm/context pair to a compound context
765 * @ctx: the existing compound context
766 * @ctxlen: size of the old context, including terminating nul byte
767 * @lsm: new lsm name, nul terminated
768 * @new: new context, possibly nul terminated
769 * @newlen: maximum size of @new
771 * replace @ctx with a new compound context, appending @newlsm and @new
772 * to @ctx. On exit the new data replaces the old, which is freed.
773 * @ctxlen is set to the new size, which includes a trailing nul byte.
775 * Returns 0 on success, -ENOMEM if no memory is available.
777 static int append_ctx(char **ctx
, int *ctxlen
, const char *lsm
, char *new,
785 llen
= strlen(lsm
) + 1;
787 * A security module may or may not provide a trailing nul on
788 * when returning a security context. There is no definition
789 * of which it should be, and there are modules that do it
792 nlen
= strnlen(new, newlen
);
794 flen
= *ctxlen
+ llen
+ nlen
+ 1;
795 final
= kzalloc(flen
, GFP_KERNEL
);
801 memcpy(final
, *ctx
, *ctxlen
);
803 memcpy(final
+ *ctxlen
, lsm
, llen
);
804 memcpy(final
+ *ctxlen
+ llen
, new, nlen
);
815 * lsm_superblock_alloc - allocate a composite superblock blob
816 * @sb: the superblock that needs a blob
818 * Allocate the superblock blob for all the modules
820 * Returns 0, or -ENOMEM if memory can't be allocated.
822 static int lsm_superblock_alloc(struct super_block
*sb
)
824 if (blob_sizes
.lbs_superblock
== 0) {
825 sb
->s_security
= NULL
;
829 sb
->s_security
= kzalloc(blob_sizes
.lbs_superblock
, GFP_KERNEL
);
830 if (sb
->s_security
== NULL
)
836 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
837 * can be accessed with:
839 * LSM_RET_DEFAULT(<hook_name>)
841 * The macros below define static constants for the default value of each
844 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
845 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
846 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
847 static const int LSM_RET_DEFAULT(NAME) = (DEFAULT);
848 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
849 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
851 #include <linux/lsm_hook_defs.h>
855 * Hook list operation macros.
858 * This is a hook that does not return a value.
861 * This is a hook that returns a value.
864 #define call_void_hook(FUNC, ...) \
866 struct security_hook_list *P; \
868 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
869 P->hook.FUNC(__VA_ARGS__); \
872 #define call_int_hook(FUNC, IRC, ...) ({ \
875 struct security_hook_list *P; \
877 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
878 RC = P->hook.FUNC(__VA_ARGS__); \
886 /* Security operations */
888 int security_binder_set_context_mgr(const struct cred
*mgr
)
890 return call_int_hook(binder_set_context_mgr
, 0, mgr
);
892 EXPORT_SYMBOL(security_binder_set_context_mgr
);
895 * security_binder_transaction - Binder driver transaction check
896 * @from: source of the transaction
897 * @to: destination of the transaction
899 * Verify that the creds have the same LSM "display", then
900 * call the security module hooks.
902 * Returns -EINVAL if the displays don't match, or the
903 * result of the security module checks.
905 int security_binder_transaction(const struct cred
*from
,
906 const struct cred
*to
)
908 int from_display
= lsm_cred_display(from
);
909 int to_display
= lsm_cred_display(to
);
912 * If the display is LSMBLOB_INVALID the first module that has
913 * an entry is used. This will be in the 0 slot.
915 * This is currently only required if the server has requested
916 * peer contexts, but it would be unwieldly to have too much of
917 * the binder driver detail here.
919 if (from_display
== LSMBLOB_INVALID
)
921 if (to_display
== LSMBLOB_INVALID
)
923 if (from_display
!= to_display
)
926 return call_int_hook(binder_transaction
, 0, from
, to
);
928 EXPORT_SYMBOL(security_binder_transaction
);
930 int security_binder_transfer_binder(const struct cred
*from
,
931 const struct cred
*to
)
933 return call_int_hook(binder_transfer_binder
, 0, from
, to
);
935 EXPORT_SYMBOL(security_binder_transfer_binder
);
937 int security_binder_transfer_file(const struct cred
*from
,
938 const struct cred
*to
, struct file
*file
)
940 return call_int_hook(binder_transfer_file
, 0, from
, to
, file
);
942 EXPORT_SYMBOL(security_binder_transfer_file
);
944 int security_ptrace_access_check(struct task_struct
*child
, unsigned int mode
)
946 return call_int_hook(ptrace_access_check
, 0, child
, mode
);
949 int security_ptrace_traceme(struct task_struct
*parent
)
951 return call_int_hook(ptrace_traceme
, 0, parent
);
954 int security_capget(struct task_struct
*target
,
955 kernel_cap_t
*effective
,
956 kernel_cap_t
*inheritable
,
957 kernel_cap_t
*permitted
)
959 return call_int_hook(capget
, 0, target
,
960 effective
, inheritable
, permitted
);
963 int security_capset(struct cred
*new, const struct cred
*old
,
964 const kernel_cap_t
*effective
,
965 const kernel_cap_t
*inheritable
,
966 const kernel_cap_t
*permitted
)
968 return call_int_hook(capset
, 0, new, old
,
969 effective
, inheritable
, permitted
);
972 int security_capable(const struct cred
*cred
,
973 struct user_namespace
*ns
,
977 return call_int_hook(capable
, 0, cred
, ns
, cap
, opts
);
980 int security_quotactl(int cmds
, int type
, int id
, struct super_block
*sb
)
982 return call_int_hook(quotactl
, 0, cmds
, type
, id
, sb
);
985 int security_quota_on(struct dentry
*dentry
)
987 return call_int_hook(quota_on
, 0, dentry
);
990 int security_syslog(int type
)
992 return call_int_hook(syslog
, 0, type
);
995 int security_settime64(const struct timespec64
*ts
, const struct timezone
*tz
)
997 return call_int_hook(settime
, 0, ts
, tz
);
1000 int security_vm_enough_memory_mm(struct mm_struct
*mm
, long pages
)
1002 struct security_hook_list
*hp
;
1003 int cap_sys_admin
= 1;
1007 * The module will respond with a positive value if
1008 * it thinks the __vm_enough_memory() call should be
1009 * made with the cap_sys_admin set. If all of the modules
1010 * agree that it should be set it will. If any module
1011 * thinks it should not be set it won't.
1013 hlist_for_each_entry(hp
, &security_hook_heads
.vm_enough_memory
, list
) {
1014 rc
= hp
->hook
.vm_enough_memory(mm
, pages
);
1020 return __vm_enough_memory(mm
, pages
, cap_sys_admin
);
1023 int security_bprm_creds_for_exec(struct linux_binprm
*bprm
)
1025 return call_int_hook(bprm_creds_for_exec
, 0, bprm
);
1028 int security_bprm_creds_from_file(struct linux_binprm
*bprm
, struct file
*file
)
1030 return call_int_hook(bprm_creds_from_file
, 0, bprm
, file
);
1033 int security_bprm_check(struct linux_binprm
*bprm
)
1037 ret
= call_int_hook(bprm_check_security
, 0, bprm
);
1040 return ima_bprm_check(bprm
);
1043 void security_bprm_committing_creds(struct linux_binprm
*bprm
)
1045 call_void_hook(bprm_committing_creds
, bprm
);
1048 void security_bprm_committed_creds(struct linux_binprm
*bprm
)
1050 call_void_hook(bprm_committed_creds
, bprm
);
1053 int security_fs_context_dup(struct fs_context
*fc
, struct fs_context
*src_fc
)
1055 return call_int_hook(fs_context_dup
, 0, fc
, src_fc
);
1058 int security_fs_context_parse_param(struct fs_context
*fc
,
1059 struct fs_parameter
*param
)
1061 struct security_hook_list
*hp
;
1065 hlist_for_each_entry(hp
, &security_hook_heads
.fs_context_parse_param
,
1067 trc
= hp
->hook
.fs_context_parse_param(fc
, param
);
1070 else if (trc
!= -ENOPARAM
)
1076 int security_sb_alloc(struct super_block
*sb
)
1078 int rc
= lsm_superblock_alloc(sb
);
1082 rc
= call_int_hook(sb_alloc_security
, 0, sb
);
1084 security_sb_free(sb
);
1088 void security_sb_delete(struct super_block
*sb
)
1090 call_void_hook(sb_delete
, sb
);
1093 void security_sb_free(struct super_block
*sb
)
1095 call_void_hook(sb_free_security
, sb
);
1096 kfree(sb
->s_security
);
1097 sb
->s_security
= NULL
;
1100 void security_free_mnt_opts(void **mnt_opts
)
1104 call_void_hook(sb_free_mnt_opts
, *mnt_opts
);
1107 EXPORT_SYMBOL(security_free_mnt_opts
);
1109 int security_sb_eat_lsm_opts(char *options
, void **mnt_opts
)
1111 return call_int_hook(sb_eat_lsm_opts
, 0, options
, mnt_opts
);
1113 EXPORT_SYMBOL(security_sb_eat_lsm_opts
);
1115 int security_sb_mnt_opts_compat(struct super_block
*sb
,
1118 return call_int_hook(sb_mnt_opts_compat
, 0, sb
, mnt_opts
);
1120 EXPORT_SYMBOL(security_sb_mnt_opts_compat
);
1122 int security_sb_remount(struct super_block
*sb
,
1125 return call_int_hook(sb_remount
, 0, sb
, mnt_opts
);
1127 EXPORT_SYMBOL(security_sb_remount
);
1129 int security_sb_kern_mount(struct super_block
*sb
)
1131 return call_int_hook(sb_kern_mount
, 0, sb
);
1134 int security_sb_show_options(struct seq_file
*m
, struct super_block
*sb
)
1136 return call_int_hook(sb_show_options
, 0, m
, sb
);
1139 int security_sb_statfs(struct dentry
*dentry
)
1141 return call_int_hook(sb_statfs
, 0, dentry
);
1144 int security_sb_mount(const char *dev_name
, const struct path
*path
,
1145 const char *type
, unsigned long flags
, void *data
)
1147 return call_int_hook(sb_mount
, 0, dev_name
, path
, type
, flags
, data
);
1150 int security_sb_umount(struct vfsmount
*mnt
, int flags
)
1152 return call_int_hook(sb_umount
, 0, mnt
, flags
);
1155 int security_sb_pivotroot(const struct path
*old_path
, const struct path
*new_path
)
1157 return call_int_hook(sb_pivotroot
, 0, old_path
, new_path
);
1160 int security_sb_set_mnt_opts(struct super_block
*sb
,
1162 unsigned long kern_flags
,
1163 unsigned long *set_kern_flags
)
1165 return call_int_hook(sb_set_mnt_opts
,
1166 mnt_opts
? -EOPNOTSUPP
: 0, sb
,
1167 mnt_opts
, kern_flags
, set_kern_flags
);
1169 EXPORT_SYMBOL(security_sb_set_mnt_opts
);
1171 int security_sb_clone_mnt_opts(const struct super_block
*oldsb
,
1172 struct super_block
*newsb
,
1173 unsigned long kern_flags
,
1174 unsigned long *set_kern_flags
)
1176 return call_int_hook(sb_clone_mnt_opts
, 0, oldsb
, newsb
,
1177 kern_flags
, set_kern_flags
);
1179 EXPORT_SYMBOL(security_sb_clone_mnt_opts
);
1181 int security_add_mnt_opt(const char *option
, const char *val
, int len
,
1184 return call_int_hook(sb_add_mnt_opt
, -EINVAL
,
1185 option
, val
, len
, mnt_opts
);
1187 EXPORT_SYMBOL(security_add_mnt_opt
);
1189 int security_move_mount(const struct path
*from_path
, const struct path
*to_path
)
1191 return call_int_hook(move_mount
, 0, from_path
, to_path
);
1194 int security_path_notify(const struct path
*path
, u64 mask
,
1195 unsigned int obj_type
)
1197 return call_int_hook(path_notify
, 0, path
, mask
, obj_type
);
1200 int security_inode_alloc(struct inode
*inode
)
1202 int rc
= lsm_inode_alloc(inode
);
1206 rc
= call_int_hook(inode_alloc_security
, 0, inode
);
1208 security_inode_free(inode
);
1212 static void inode_free_by_rcu(struct rcu_head
*head
)
1215 * The rcu head is at the start of the inode blob
1217 kmem_cache_free(lsm_inode_cache
, head
);
1220 void security_inode_free(struct inode
*inode
)
1222 integrity_inode_free(inode
);
1223 call_void_hook(inode_free_security
, inode
);
1225 * The inode may still be referenced in a path walk and
1226 * a call to security_inode_permission() can be made
1227 * after inode_free_security() is called. Ideally, the VFS
1228 * wouldn't do this, but fixing that is a much harder
1229 * job. For now, simply free the i_security via RCU, and
1230 * leave the current inode->i_security pointer intact.
1231 * The inode will be freed after the RCU grace period too.
1233 if (inode
->i_security
)
1234 call_rcu((struct rcu_head
*)inode
->i_security
,
1238 int security_dentry_init_security(struct dentry
*dentry
, int mode
,
1239 const struct qstr
*name
, void **ctx
,
1242 return call_int_hook(dentry_init_security
, -EOPNOTSUPP
, dentry
, mode
,
1245 EXPORT_SYMBOL(security_dentry_init_security
);
1247 int security_dentry_create_files_as(struct dentry
*dentry
, int mode
,
1249 const struct cred
*old
, struct cred
*new)
1251 return call_int_hook(dentry_create_files_as
, 0, dentry
, mode
,
1254 EXPORT_SYMBOL(security_dentry_create_files_as
);
1256 int security_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1257 const struct qstr
*qstr
,
1258 const initxattrs initxattrs
, void *fs_data
)
1260 struct xattr new_xattrs
[MAX_LSM_EVM_XATTR
+ 1];
1261 struct xattr
*lsm_xattr
, *evm_xattr
, *xattr
;
1264 if (unlikely(IS_PRIVATE(inode
)))
1268 return call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
,
1269 dir
, qstr
, NULL
, NULL
, NULL
);
1270 memset(new_xattrs
, 0, sizeof(new_xattrs
));
1271 lsm_xattr
= new_xattrs
;
1272 ret
= call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
, dir
, qstr
,
1275 &lsm_xattr
->value_len
);
1279 evm_xattr
= lsm_xattr
+ 1;
1280 ret
= evm_inode_init_security(inode
, lsm_xattr
, evm_xattr
);
1283 ret
= initxattrs(inode
, new_xattrs
, fs_data
);
1285 for (xattr
= new_xattrs
; xattr
->value
!= NULL
; xattr
++)
1286 kfree(xattr
->value
);
1287 return (ret
== -EOPNOTSUPP
) ? 0 : ret
;
1289 EXPORT_SYMBOL(security_inode_init_security
);
1291 int security_inode_init_security_anon(struct inode
*inode
,
1292 const struct qstr
*name
,
1293 const struct inode
*context_inode
)
1295 return call_int_hook(inode_init_security_anon
, 0, inode
, name
,
1299 int security_old_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1300 const struct qstr
*qstr
, const char **name
,
1301 void **value
, size_t *len
)
1303 if (unlikely(IS_PRIVATE(inode
)))
1305 return call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
, dir
,
1306 qstr
, name
, value
, len
);
1308 EXPORT_SYMBOL(security_old_inode_init_security
);
1310 #ifdef CONFIG_SECURITY_PATH
1311 int security_path_mknod(const struct path
*dir
, struct dentry
*dentry
, umode_t mode
,
1314 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1316 return call_int_hook(path_mknod
, 0, dir
, dentry
, mode
, dev
);
1318 EXPORT_SYMBOL(security_path_mknod
);
1320 int security_path_mkdir(const struct path
*dir
, struct dentry
*dentry
, umode_t mode
)
1322 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1324 return call_int_hook(path_mkdir
, 0, dir
, dentry
, mode
);
1326 EXPORT_SYMBOL(security_path_mkdir
);
1328 int security_path_rmdir(const struct path
*dir
, struct dentry
*dentry
)
1330 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1332 return call_int_hook(path_rmdir
, 0, dir
, dentry
);
1334 EXPORT_SYMBOL_GPL(security_path_rmdir
);
1336 int security_path_unlink(const struct path
*dir
, struct dentry
*dentry
)
1338 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1340 return call_int_hook(path_unlink
, 0, dir
, dentry
);
1342 EXPORT_SYMBOL(security_path_unlink
);
1344 int security_path_symlink(const struct path
*dir
, struct dentry
*dentry
,
1345 const char *old_name
)
1347 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1349 return call_int_hook(path_symlink
, 0, dir
, dentry
, old_name
);
1351 EXPORT_SYMBOL_GPL(security_path_symlink
);
1353 int security_path_link(struct dentry
*old_dentry
, const struct path
*new_dir
,
1354 struct dentry
*new_dentry
)
1356 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1358 return call_int_hook(path_link
, 0, old_dentry
, new_dir
, new_dentry
);
1360 EXPORT_SYMBOL_GPL(security_path_link
);
1362 int security_path_rename(const struct path
*old_dir
, struct dentry
*old_dentry
,
1363 const struct path
*new_dir
, struct dentry
*new_dentry
,
1366 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1367 (d_is_positive(new_dentry
) && IS_PRIVATE(d_backing_inode(new_dentry
)))))
1370 if (flags
& RENAME_EXCHANGE
) {
1371 int err
= call_int_hook(path_rename
, 0, new_dir
, new_dentry
,
1372 old_dir
, old_dentry
);
1377 return call_int_hook(path_rename
, 0, old_dir
, old_dentry
, new_dir
,
1380 EXPORT_SYMBOL(security_path_rename
);
1382 int security_path_truncate(const struct path
*path
)
1384 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1386 return call_int_hook(path_truncate
, 0, path
);
1388 EXPORT_SYMBOL_GPL(security_path_truncate
);
1390 int security_path_chmod(const struct path
*path
, umode_t mode
)
1392 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1394 return call_int_hook(path_chmod
, 0, path
, mode
);
1396 EXPORT_SYMBOL_GPL(security_path_chmod
);
1398 int security_path_chown(const struct path
*path
, kuid_t uid
, kgid_t gid
)
1400 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1402 return call_int_hook(path_chown
, 0, path
, uid
, gid
);
1404 EXPORT_SYMBOL_GPL(security_path_chown
);
1406 int security_path_chroot(const struct path
*path
)
1408 return call_int_hook(path_chroot
, 0, path
);
1412 int security_inode_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1414 if (unlikely(IS_PRIVATE(dir
)))
1416 return call_int_hook(inode_create
, 0, dir
, dentry
, mode
);
1418 EXPORT_SYMBOL_GPL(security_inode_create
);
1420 int security_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1421 struct dentry
*new_dentry
)
1423 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1425 return call_int_hook(inode_link
, 0, old_dentry
, dir
, new_dentry
);
1428 int security_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1430 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1432 return call_int_hook(inode_unlink
, 0, dir
, dentry
);
1435 int security_inode_symlink(struct inode
*dir
, struct dentry
*dentry
,
1436 const char *old_name
)
1438 if (unlikely(IS_PRIVATE(dir
)))
1440 return call_int_hook(inode_symlink
, 0, dir
, dentry
, old_name
);
1443 int security_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1445 if (unlikely(IS_PRIVATE(dir
)))
1447 return call_int_hook(inode_mkdir
, 0, dir
, dentry
, mode
);
1449 EXPORT_SYMBOL_GPL(security_inode_mkdir
);
1451 int security_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1453 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1455 return call_int_hook(inode_rmdir
, 0, dir
, dentry
);
1458 int security_inode_mknod(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, dev_t dev
)
1460 if (unlikely(IS_PRIVATE(dir
)))
1462 return call_int_hook(inode_mknod
, 0, dir
, dentry
, mode
, dev
);
1465 int security_inode_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
1466 struct inode
*new_dir
, struct dentry
*new_dentry
,
1469 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1470 (d_is_positive(new_dentry
) && IS_PRIVATE(d_backing_inode(new_dentry
)))))
1473 if (flags
& RENAME_EXCHANGE
) {
1474 int err
= call_int_hook(inode_rename
, 0, new_dir
, new_dentry
,
1475 old_dir
, old_dentry
);
1480 return call_int_hook(inode_rename
, 0, old_dir
, old_dentry
,
1481 new_dir
, new_dentry
);
1484 int security_inode_readlink(struct dentry
*dentry
)
1486 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1488 return call_int_hook(inode_readlink
, 0, dentry
);
1491 int security_inode_follow_link(struct dentry
*dentry
, struct inode
*inode
,
1494 if (unlikely(IS_PRIVATE(inode
)))
1496 return call_int_hook(inode_follow_link
, 0, dentry
, inode
, rcu
);
1499 int security_inode_permission(struct inode
*inode
, int mask
)
1501 if (unlikely(IS_PRIVATE(inode
)))
1503 return call_int_hook(inode_permission
, 0, inode
, mask
);
1505 EXPORT_SYMBOL_GPL(security_inode_permission
);
1507 int security_inode_setattr(struct dentry
*dentry
, struct iattr
*attr
)
1511 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1513 ret
= call_int_hook(inode_setattr
, 0, dentry
, attr
);
1516 return evm_inode_setattr(dentry
, attr
);
1518 EXPORT_SYMBOL_GPL(security_inode_setattr
);
1520 int security_inode_getattr(const struct path
*path
)
1522 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1524 return call_int_hook(inode_getattr
, 0, path
);
1527 int security_inode_setxattr(struct user_namespace
*mnt_userns
,
1528 struct dentry
*dentry
, const char *name
,
1529 const void *value
, size_t size
, int flags
)
1533 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1536 * SELinux and Smack integrate the cap call,
1537 * so assume that all LSMs supplying this call do so.
1539 ret
= call_int_hook(inode_setxattr
, 1, mnt_userns
, dentry
, name
, value
,
1543 ret
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1546 ret
= ima_inode_setxattr(dentry
, name
, value
, size
);
1549 return evm_inode_setxattr(mnt_userns
, dentry
, name
, value
, size
);
1552 void security_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1553 const void *value
, size_t size
, int flags
)
1555 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1557 call_void_hook(inode_post_setxattr
, dentry
, name
, value
, size
, flags
);
1558 evm_inode_post_setxattr(dentry
, name
, value
, size
);
1561 int security_inode_getxattr(struct dentry
*dentry
, const char *name
)
1563 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1565 return call_int_hook(inode_getxattr
, 0, dentry
, name
);
1568 int security_inode_listxattr(struct dentry
*dentry
)
1570 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1572 return call_int_hook(inode_listxattr
, 0, dentry
);
1575 int security_inode_removexattr(struct user_namespace
*mnt_userns
,
1576 struct dentry
*dentry
, const char *name
)
1580 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1583 * SELinux and Smack integrate the cap call,
1584 * so assume that all LSMs supplying this call do so.
1586 ret
= call_int_hook(inode_removexattr
, 1, mnt_userns
, dentry
, name
);
1588 ret
= cap_inode_removexattr(mnt_userns
, dentry
, name
);
1591 ret
= ima_inode_removexattr(dentry
, name
);
1594 return evm_inode_removexattr(mnt_userns
, dentry
, name
);
1597 int security_inode_need_killpriv(struct dentry
*dentry
)
1599 return call_int_hook(inode_need_killpriv
, 0, dentry
);
1602 int security_inode_killpriv(struct user_namespace
*mnt_userns
,
1603 struct dentry
*dentry
)
1605 return call_int_hook(inode_killpriv
, 0, mnt_userns
, dentry
);
1608 int security_inode_getsecurity(struct user_namespace
*mnt_userns
,
1609 struct inode
*inode
, const char *name
,
1610 void **buffer
, bool alloc
)
1612 struct security_hook_list
*hp
;
1615 if (unlikely(IS_PRIVATE(inode
)))
1616 return LSM_RET_DEFAULT(inode_getsecurity
);
1618 * Only one module will provide an attribute with a given name.
1620 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecurity
, list
) {
1621 rc
= hp
->hook
.inode_getsecurity(mnt_userns
, inode
, name
, buffer
, alloc
);
1622 if (rc
!= LSM_RET_DEFAULT(inode_getsecurity
))
1625 return LSM_RET_DEFAULT(inode_getsecurity
);
1628 int security_inode_setsecurity(struct inode
*inode
, const char *name
, const void *value
, size_t size
, int flags
)
1630 struct security_hook_list
*hp
;
1633 if (unlikely(IS_PRIVATE(inode
)))
1634 return LSM_RET_DEFAULT(inode_setsecurity
);
1636 * Only one module will provide an attribute with a given name.
1638 hlist_for_each_entry(hp
, &security_hook_heads
.inode_setsecurity
, list
) {
1639 rc
= hp
->hook
.inode_setsecurity(inode
, name
, value
, size
,
1641 if (rc
!= LSM_RET_DEFAULT(inode_setsecurity
))
1644 return LSM_RET_DEFAULT(inode_setsecurity
);
1647 int security_inode_listsecurity(struct inode
*inode
, char *buffer
, size_t buffer_size
)
1649 if (unlikely(IS_PRIVATE(inode
)))
1651 return call_int_hook(inode_listsecurity
, 0, inode
, buffer
, buffer_size
);
1653 EXPORT_SYMBOL(security_inode_listsecurity
);
1655 void security_inode_getsecid(struct inode
*inode
, struct lsmblob
*blob
)
1657 struct security_hook_list
*hp
;
1659 lsmblob_init(blob
, 0);
1660 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecid
, list
) {
1661 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1663 hp
->hook
.inode_getsecid(inode
, &blob
->secid
[hp
->lsmid
->slot
]);
1667 int security_inode_copy_up(struct dentry
*src
, struct cred
**new)
1669 return call_int_hook(inode_copy_up
, 0, src
, new);
1671 EXPORT_SYMBOL(security_inode_copy_up
);
1673 int security_inode_copy_up_xattr(const char *name
)
1675 struct security_hook_list
*hp
;
1679 * The implementation can return 0 (accept the xattr), 1 (discard the
1680 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
1681 * any other error code incase of an error.
1683 hlist_for_each_entry(hp
,
1684 &security_hook_heads
.inode_copy_up_xattr
, list
) {
1685 rc
= hp
->hook
.inode_copy_up_xattr(name
);
1686 if (rc
!= LSM_RET_DEFAULT(inode_copy_up_xattr
))
1690 return LSM_RET_DEFAULT(inode_copy_up_xattr
);
1692 EXPORT_SYMBOL(security_inode_copy_up_xattr
);
1694 int security_kernfs_init_security(struct kernfs_node
*kn_dir
,
1695 struct kernfs_node
*kn
)
1697 return call_int_hook(kernfs_init_security
, 0, kn_dir
, kn
);
1700 int security_file_permission(struct file
*file
, int mask
)
1704 ret
= call_int_hook(file_permission
, 0, file
, mask
);
1708 return fsnotify_perm(file
, mask
);
1710 EXPORT_SYMBOL_GPL(security_file_permission
);
1712 int security_file_alloc(struct file
*file
)
1714 int rc
= lsm_file_alloc(file
);
1718 rc
= call_int_hook(file_alloc_security
, 0, file
);
1720 security_file_free(file
);
1724 void security_file_free(struct file
*file
)
1728 call_void_hook(file_free_security
, file
);
1730 blob
= file
->f_security
;
1732 file
->f_security
= NULL
;
1733 kmem_cache_free(lsm_file_cache
, blob
);
1737 int security_file_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1739 return call_int_hook(file_ioctl
, 0, file
, cmd
, arg
);
1741 EXPORT_SYMBOL_GPL(security_file_ioctl
);
1743 static inline unsigned long mmap_prot(struct file
*file
, unsigned long prot
)
1746 * Does we have PROT_READ and does the application expect
1747 * it to imply PROT_EXEC? If not, nothing to talk about...
1749 if ((prot
& (PROT_READ
| PROT_EXEC
)) != PROT_READ
)
1751 if (!(current
->personality
& READ_IMPLIES_EXEC
))
1754 * if that's an anonymous mapping, let it.
1757 return prot
| PROT_EXEC
;
1759 * ditto if it's not on noexec mount, except that on !MMU we need
1760 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
1762 if (!path_noexec(&file
->f_path
)) {
1764 if (file
->f_op
->mmap_capabilities
) {
1765 unsigned caps
= file
->f_op
->mmap_capabilities(file
);
1766 if (!(caps
& NOMMU_MAP_EXEC
))
1770 return prot
| PROT_EXEC
;
1772 /* anything on noexec mount won't get PROT_EXEC */
1776 int security_mmap_file(struct file
*file
, unsigned long prot
,
1777 unsigned long flags
)
1780 ret
= call_int_hook(mmap_file
, 0, file
, prot
,
1781 mmap_prot(file
, prot
), flags
);
1784 return ima_file_mmap(file
, prot
);
1787 int security_mmap_addr(unsigned long addr
)
1789 return call_int_hook(mmap_addr
, 0, addr
);
1792 int security_file_mprotect(struct vm_area_struct
*vma
, unsigned long reqprot
,
1797 ret
= call_int_hook(file_mprotect
, 0, vma
, reqprot
, prot
);
1800 return ima_file_mprotect(vma
, prot
);
1803 int security_file_lock(struct file
*file
, unsigned int cmd
)
1805 return call_int_hook(file_lock
, 0, file
, cmd
);
1808 int security_file_fcntl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1810 return call_int_hook(file_fcntl
, 0, file
, cmd
, arg
);
1813 void security_file_set_fowner(struct file
*file
)
1815 call_void_hook(file_set_fowner
, file
);
1818 int security_file_send_sigiotask(struct task_struct
*tsk
,
1819 struct fown_struct
*fown
, int sig
)
1821 return call_int_hook(file_send_sigiotask
, 0, tsk
, fown
, sig
);
1824 int security_file_receive(struct file
*file
)
1826 return call_int_hook(file_receive
, 0, file
);
1829 int security_file_open(struct file
*file
)
1833 ret
= call_int_hook(file_open
, 0, file
);
1837 return fsnotify_perm(file
, MAY_OPEN
);
1840 int security_task_alloc(struct task_struct
*task
, unsigned long clone_flags
)
1842 int *odisplay
= current
->security
;
1844 int rc
= lsm_task_alloc(task
);
1849 rc
= call_int_hook(task_alloc
, 0, task
, clone_flags
);
1851 security_task_free(task
);
1856 ndisplay
= task
->security
;
1858 *ndisplay
= *odisplay
;
1864 void security_task_free(struct task_struct
*task
)
1866 call_void_hook(task_free
, task
);
1868 kfree(task
->security
);
1869 task
->security
= NULL
;
1872 int security_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1874 int rc
= lsm_cred_alloc(cred
, gfp
);
1879 rc
= call_int_hook(cred_alloc_blank
, 0, cred
, gfp
);
1881 security_cred_free(cred
);
1885 void security_cred_free(struct cred
*cred
)
1888 * There is a failure case in prepare_creds() that
1889 * may result in a call here with ->security being NULL.
1891 if (unlikely(cred
->security
== NULL
))
1894 call_void_hook(cred_free
, cred
);
1896 kfree(cred
->security
);
1897 cred
->security
= NULL
;
1900 int security_prepare_creds(struct cred
*new, const struct cred
*old
, gfp_t gfp
)
1902 int rc
= lsm_cred_alloc(new, gfp
);
1907 rc
= call_int_hook(cred_prepare
, 0, new, old
, gfp
);
1909 security_cred_free(new);
1913 void security_transfer_creds(struct cred
*new, const struct cred
*old
)
1915 call_void_hook(cred_transfer
, new, old
);
1918 void security_cred_getsecid(const struct cred
*c
, struct lsmblob
*blob
)
1920 struct security_hook_list
*hp
;
1922 lsmblob_init(blob
, 0);
1923 hlist_for_each_entry(hp
, &security_hook_heads
.cred_getsecid
, list
) {
1924 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1926 hp
->hook
.cred_getsecid(c
, &blob
->secid
[hp
->lsmid
->slot
]);
1929 EXPORT_SYMBOL(security_cred_getsecid
);
1931 int security_kernel_act_as(struct cred
*new, struct lsmblob
*blob
)
1933 struct security_hook_list
*hp
;
1936 hlist_for_each_entry(hp
, &security_hook_heads
.kernel_act_as
, list
) {
1937 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1939 rc
= hp
->hook
.kernel_act_as(new, blob
->secid
[hp
->lsmid
->slot
]);
1946 int security_kernel_create_files_as(struct cred
*new, struct inode
*inode
)
1948 return call_int_hook(kernel_create_files_as
, 0, new, inode
);
1951 int security_kernel_module_request(char *kmod_name
)
1955 ret
= call_int_hook(kernel_module_request
, 0, kmod_name
);
1958 return integrity_kernel_module_request(kmod_name
);
1961 int security_kernel_read_file(struct file
*file
, enum kernel_read_file_id id
,
1966 ret
= call_int_hook(kernel_read_file
, 0, file
, id
, contents
);
1969 return ima_read_file(file
, id
, contents
);
1971 EXPORT_SYMBOL_GPL(security_kernel_read_file
);
1973 int security_kernel_post_read_file(struct file
*file
, char *buf
, loff_t size
,
1974 enum kernel_read_file_id id
)
1978 ret
= call_int_hook(kernel_post_read_file
, 0, file
, buf
, size
, id
);
1981 return ima_post_read_file(file
, buf
, size
, id
);
1983 EXPORT_SYMBOL_GPL(security_kernel_post_read_file
);
1985 int security_kernel_load_data(enum kernel_load_data_id id
, bool contents
)
1989 ret
= call_int_hook(kernel_load_data
, 0, id
, contents
);
1992 return ima_load_data(id
, contents
);
1994 EXPORT_SYMBOL_GPL(security_kernel_load_data
);
1996 int security_kernel_post_load_data(char *buf
, loff_t size
,
1997 enum kernel_load_data_id id
,
2002 ret
= call_int_hook(kernel_post_load_data
, 0, buf
, size
, id
,
2006 return ima_post_load_data(buf
, size
, id
, description
);
2008 EXPORT_SYMBOL_GPL(security_kernel_post_load_data
);
2010 int security_task_fix_setuid(struct cred
*new, const struct cred
*old
,
2013 return call_int_hook(task_fix_setuid
, 0, new, old
, flags
);
2016 int security_task_fix_setgid(struct cred
*new, const struct cred
*old
,
2019 return call_int_hook(task_fix_setgid
, 0, new, old
, flags
);
2022 int security_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2024 return call_int_hook(task_setpgid
, 0, p
, pgid
);
2027 int security_task_getpgid(struct task_struct
*p
)
2029 return call_int_hook(task_getpgid
, 0, p
);
2032 int security_task_getsid(struct task_struct
*p
)
2034 return call_int_hook(task_getsid
, 0, p
);
2037 void security_task_getsecid_subj(struct task_struct
*p
, struct lsmblob
*blob
)
2039 struct security_hook_list
*hp
;
2041 lsmblob_init(blob
, 0);
2042 hlist_for_each_entry(hp
, &security_hook_heads
.task_getsecid_subj
, list
) {
2043 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2045 hp
->hook
.task_getsecid_subj(p
, &blob
->secid
[hp
->lsmid
->slot
]);
2048 EXPORT_SYMBOL(security_task_getsecid_subj
);
2050 void security_task_getsecid_obj(struct task_struct
*p
, struct lsmblob
*blob
)
2052 struct security_hook_list
*hp
;
2054 lsmblob_init(blob
, 0);
2055 hlist_for_each_entry(hp
, &security_hook_heads
.task_getsecid_obj
, list
) {
2056 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2058 hp
->hook
.task_getsecid_obj(p
, &blob
->secid
[hp
->lsmid
->slot
]);
2061 EXPORT_SYMBOL(security_task_getsecid_obj
);
2063 int security_task_setnice(struct task_struct
*p
, int nice
)
2065 return call_int_hook(task_setnice
, 0, p
, nice
);
2068 int security_task_setioprio(struct task_struct
*p
, int ioprio
)
2070 return call_int_hook(task_setioprio
, 0, p
, ioprio
);
2073 int security_task_getioprio(struct task_struct
*p
)
2075 return call_int_hook(task_getioprio
, 0, p
);
2078 int security_task_prlimit(const struct cred
*cred
, const struct cred
*tcred
,
2081 return call_int_hook(task_prlimit
, 0, cred
, tcred
, flags
);
2084 int security_task_setrlimit(struct task_struct
*p
, unsigned int resource
,
2085 struct rlimit
*new_rlim
)
2087 return call_int_hook(task_setrlimit
, 0, p
, resource
, new_rlim
);
2090 int security_task_setscheduler(struct task_struct
*p
)
2092 return call_int_hook(task_setscheduler
, 0, p
);
2095 int security_task_getscheduler(struct task_struct
*p
)
2097 return call_int_hook(task_getscheduler
, 0, p
);
2100 int security_task_movememory(struct task_struct
*p
)
2102 return call_int_hook(task_movememory
, 0, p
);
2105 int security_task_kill(struct task_struct
*p
, struct kernel_siginfo
*info
,
2106 int sig
, const struct cred
*cred
)
2108 return call_int_hook(task_kill
, 0, p
, info
, sig
, cred
);
2111 int security_task_prctl(int option
, unsigned long arg2
, unsigned long arg3
,
2112 unsigned long arg4
, unsigned long arg5
)
2115 int rc
= LSM_RET_DEFAULT(task_prctl
);
2116 struct security_hook_list
*hp
;
2118 hlist_for_each_entry(hp
, &security_hook_heads
.task_prctl
, list
) {
2119 thisrc
= hp
->hook
.task_prctl(option
, arg2
, arg3
, arg4
, arg5
);
2120 if (thisrc
!= LSM_RET_DEFAULT(task_prctl
)) {
2129 void security_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2131 call_void_hook(task_to_inode
, p
, inode
);
2134 int security_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
2136 return call_int_hook(ipc_permission
, 0, ipcp
, flag
);
2139 void security_ipc_getsecid(struct kern_ipc_perm
*ipcp
, struct lsmblob
*blob
)
2141 struct security_hook_list
*hp
;
2143 lsmblob_init(blob
, 0);
2144 hlist_for_each_entry(hp
, &security_hook_heads
.ipc_getsecid
, list
) {
2145 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2147 hp
->hook
.ipc_getsecid(ipcp
, &blob
->secid
[hp
->lsmid
->slot
]);
2151 int security_msg_msg_alloc(struct msg_msg
*msg
)
2153 int rc
= lsm_msg_msg_alloc(msg
);
2157 rc
= call_int_hook(msg_msg_alloc_security
, 0, msg
);
2159 security_msg_msg_free(msg
);
2163 void security_msg_msg_free(struct msg_msg
*msg
)
2165 call_void_hook(msg_msg_free_security
, msg
);
2166 kfree(msg
->security
);
2167 msg
->security
= NULL
;
2170 int security_msg_queue_alloc(struct kern_ipc_perm
*msq
)
2172 int rc
= lsm_ipc_alloc(msq
);
2176 rc
= call_int_hook(msg_queue_alloc_security
, 0, msq
);
2178 security_msg_queue_free(msq
);
2182 void security_msg_queue_free(struct kern_ipc_perm
*msq
)
2184 call_void_hook(msg_queue_free_security
, msq
);
2185 kfree(msq
->security
);
2186 msq
->security
= NULL
;
2189 int security_msg_queue_associate(struct kern_ipc_perm
*msq
, int msqflg
)
2191 return call_int_hook(msg_queue_associate
, 0, msq
, msqflg
);
2194 int security_msg_queue_msgctl(struct kern_ipc_perm
*msq
, int cmd
)
2196 return call_int_hook(msg_queue_msgctl
, 0, msq
, cmd
);
2199 int security_msg_queue_msgsnd(struct kern_ipc_perm
*msq
,
2200 struct msg_msg
*msg
, int msqflg
)
2202 return call_int_hook(msg_queue_msgsnd
, 0, msq
, msg
, msqflg
);
2205 int security_msg_queue_msgrcv(struct kern_ipc_perm
*msq
, struct msg_msg
*msg
,
2206 struct task_struct
*target
, long type
, int mode
)
2208 return call_int_hook(msg_queue_msgrcv
, 0, msq
, msg
, target
, type
, mode
);
2211 int security_shm_alloc(struct kern_ipc_perm
*shp
)
2213 int rc
= lsm_ipc_alloc(shp
);
2217 rc
= call_int_hook(shm_alloc_security
, 0, shp
);
2219 security_shm_free(shp
);
2223 void security_shm_free(struct kern_ipc_perm
*shp
)
2225 call_void_hook(shm_free_security
, shp
);
2226 kfree(shp
->security
);
2227 shp
->security
= NULL
;
2230 int security_shm_associate(struct kern_ipc_perm
*shp
, int shmflg
)
2232 return call_int_hook(shm_associate
, 0, shp
, shmflg
);
2235 int security_shm_shmctl(struct kern_ipc_perm
*shp
, int cmd
)
2237 return call_int_hook(shm_shmctl
, 0, shp
, cmd
);
2240 int security_shm_shmat(struct kern_ipc_perm
*shp
, char __user
*shmaddr
, int shmflg
)
2242 return call_int_hook(shm_shmat
, 0, shp
, shmaddr
, shmflg
);
2245 int security_sem_alloc(struct kern_ipc_perm
*sma
)
2247 int rc
= lsm_ipc_alloc(sma
);
2251 rc
= call_int_hook(sem_alloc_security
, 0, sma
);
2253 security_sem_free(sma
);
2257 void security_sem_free(struct kern_ipc_perm
*sma
)
2259 call_void_hook(sem_free_security
, sma
);
2260 kfree(sma
->security
);
2261 sma
->security
= NULL
;
2264 int security_sem_associate(struct kern_ipc_perm
*sma
, int semflg
)
2266 return call_int_hook(sem_associate
, 0, sma
, semflg
);
2269 int security_sem_semctl(struct kern_ipc_perm
*sma
, int cmd
)
2271 return call_int_hook(sem_semctl
, 0, sma
, cmd
);
2274 int security_sem_semop(struct kern_ipc_perm
*sma
, struct sembuf
*sops
,
2275 unsigned nsops
, int alter
)
2277 return call_int_hook(sem_semop
, 0, sma
, sops
, nsops
, alter
);
2280 void security_d_instantiate(struct dentry
*dentry
, struct inode
*inode
)
2282 if (unlikely(inode
&& IS_PRIVATE(inode
)))
2284 call_void_hook(d_instantiate
, dentry
, inode
);
2286 EXPORT_SYMBOL(security_d_instantiate
);
2288 int security_getprocattr(struct task_struct
*p
, const char *lsm
, char *name
,
2291 struct security_hook_list
*hp
;
2296 int display
= lsm_task_display(current
);
2299 if (!strcmp(name
, "display")) {
2301 * lsm_slot will be 0 if there are no displaying modules.
2307 * Only allow getting the current process' display.
2308 * There are too few reasons to get another process'
2309 * display and too many LSM policy issues.
2314 display
= lsm_task_display(p
);
2315 if (display
!= LSMBLOB_INVALID
)
2317 *value
= kstrdup(lsm_slotlist
[slot
]->lsm
, GFP_KERNEL
);
2319 return strlen(*value
);
2323 if (!strcmp(name
, "context")) {
2324 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
,
2326 rc
= hp
->hook
.getprocattr(p
, "context", &cp
);
2333 rc
= append_ctx(&final
, &finallen
, hp
->lsmid
->lsm
,
2347 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
, list
) {
2348 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsmid
->lsm
))
2350 if (lsm
== NULL
&& display
!= LSMBLOB_INVALID
&&
2351 display
!= hp
->lsmid
->slot
)
2353 return hp
->hook
.getprocattr(p
, name
, value
);
2355 return LSM_RET_DEFAULT(getprocattr
);
2359 * security_setprocattr - Set process attributes via /proc
2360 * @lsm: name of module involved, or NULL
2361 * @name: name of the attribute
2362 * @value: value to set the attribute to
2363 * @size: size of the value
2365 * Set the process attribute for the specified security module
2366 * to the specified value. Note that this can only be used to set
2367 * the process attributes for the current, or "self" process.
2368 * The /proc code has already done this check.
2370 * Returns 0 on success, an appropriate code otherwise.
2372 int security_setprocattr(const char *lsm
, const char *name
, void *value
,
2375 struct security_hook_list
*hp
;
2378 int *display
= current
->security
;
2382 if (!strcmp(name
, "display")) {
2384 * Change the "display" value only if all the security
2385 * modules that support setting a procattr allow it.
2386 * It is assumed that all such security modules will be
2392 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
,
2394 rc
= hp
->hook
.setprocattr(name
, value
, size
);
2395 if (rc
< 0 && rc
!= -EINVAL
)
2401 copy
= kmemdup_nul(value
, size
, GFP_KERNEL
);
2405 termed
= strsep(©
, " \n");
2407 for (slot
= 0; slot
< lsm_slot
; slot
++)
2408 if (!strcmp(termed
, lsm_slotlist
[slot
]->lsm
)) {
2409 *display
= lsm_slotlist
[slot
]->slot
;
2418 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
, list
) {
2419 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsmid
->lsm
))
2421 if (lsm
== NULL
&& *display
!= LSMBLOB_INVALID
&&
2422 *display
!= hp
->lsmid
->slot
)
2424 return hp
->hook
.setprocattr(name
, value
, size
);
2426 return LSM_RET_DEFAULT(setprocattr
);
2429 int security_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
2431 return call_int_hook(netlink_send
, 0, sk
, skb
);
2434 int security_ismaclabel(const char *name
)
2436 return call_int_hook(ismaclabel
, 0, name
);
2438 EXPORT_SYMBOL(security_ismaclabel
);
2440 int security_secid_to_secctx(struct lsmblob
*blob
, struct lsmcontext
*cp
,
2443 struct security_hook_list
*hp
;
2445 memset(cp
, 0, sizeof(*cp
));
2448 * display either is the slot number use for formatting
2449 * or an instruction on which relative slot to use.
2451 if (display
== LSMBLOB_DISPLAY
)
2452 display
= lsm_task_display(current
);
2453 else if (display
== LSMBLOB_FIRST
)
2454 display
= LSMBLOB_INVALID
;
2455 else if (display
< 0) {
2457 "LSM: %s unknown display\n", __func__
);
2458 display
= LSMBLOB_INVALID
;
2459 } else if (display
>= lsm_slot
) {
2461 "LSM: %s invalid display\n", __func__
);
2462 display
= LSMBLOB_INVALID
;
2466 hlist_for_each_entry(hp
, &security_hook_heads
.secid_to_secctx
, list
) {
2467 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2469 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
) {
2470 cp
->slot
= hp
->lsmid
->slot
;
2471 return hp
->hook
.secid_to_secctx(
2472 blob
->secid
[hp
->lsmid
->slot
],
2473 &cp
->context
, &cp
->len
);
2477 return LSM_RET_DEFAULT(secid_to_secctx
);
2479 EXPORT_SYMBOL(security_secid_to_secctx
);
2481 int security_secctx_to_secid(const char *secdata
, u32 seclen
,
2482 struct lsmblob
*blob
)
2484 struct security_hook_list
*hp
;
2485 int display
= lsm_task_display(current
);
2487 lsmblob_init(blob
, 0);
2488 hlist_for_each_entry(hp
, &security_hook_heads
.secctx_to_secid
, list
) {
2489 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2491 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
)
2492 return hp
->hook
.secctx_to_secid(secdata
, seclen
,
2493 &blob
->secid
[hp
->lsmid
->slot
]);
2497 EXPORT_SYMBOL(security_secctx_to_secid
);
2499 void security_release_secctx(struct lsmcontext
*cp
)
2501 struct security_hook_list
*hp
;
2503 hlist_for_each_entry(hp
, &security_hook_heads
.release_secctx
, list
)
2504 if (cp
->slot
== hp
->lsmid
->slot
) {
2505 hp
->hook
.release_secctx(cp
->context
, cp
->len
);
2509 memset(cp
, 0, sizeof(*cp
));
2511 EXPORT_SYMBOL(security_release_secctx
);
2513 void security_inode_invalidate_secctx(struct inode
*inode
)
2515 call_void_hook(inode_invalidate_secctx
, inode
);
2517 EXPORT_SYMBOL(security_inode_invalidate_secctx
);
2519 int security_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
2521 return call_int_hook(inode_notifysecctx
, 0, inode
, ctx
, ctxlen
);
2523 EXPORT_SYMBOL(security_inode_notifysecctx
);
2525 int security_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
2527 return call_int_hook(inode_setsecctx
, 0, dentry
, ctx
, ctxlen
);
2529 EXPORT_SYMBOL(security_inode_setsecctx
);
2531 int security_inode_getsecctx(struct inode
*inode
, struct lsmcontext
*cp
)
2533 struct security_hook_list
*hp
;
2535 memset(cp
, 0, sizeof(*cp
));
2537 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecctx
, list
) {
2538 cp
->slot
= hp
->lsmid
->slot
;
2539 return hp
->hook
.inode_getsecctx(inode
, (void **)&cp
->context
,
2544 EXPORT_SYMBOL(security_inode_getsecctx
);
2546 #ifdef CONFIG_WATCH_QUEUE
2547 int security_post_notification(const struct cred
*w_cred
,
2548 const struct cred
*cred
,
2549 struct watch_notification
*n
)
2551 return call_int_hook(post_notification
, 0, w_cred
, cred
, n
);
2553 #endif /* CONFIG_WATCH_QUEUE */
2555 #ifdef CONFIG_KEY_NOTIFICATIONS
2556 int security_watch_key(struct key
*key
)
2558 return call_int_hook(watch_key
, 0, key
);
2562 #ifdef CONFIG_SECURITY_NETWORK
2564 int security_unix_stream_connect(struct sock
*sock
, struct sock
*other
, struct sock
*newsk
)
2566 return call_int_hook(unix_stream_connect
, 0, sock
, other
, newsk
);
2568 EXPORT_SYMBOL(security_unix_stream_connect
);
2570 int security_unix_may_send(struct socket
*sock
, struct socket
*other
)
2572 return call_int_hook(unix_may_send
, 0, sock
, other
);
2574 EXPORT_SYMBOL(security_unix_may_send
);
2576 int security_socket_create(int family
, int type
, int protocol
, int kern
)
2578 return call_int_hook(socket_create
, 0, family
, type
, protocol
, kern
);
2581 int security_socket_post_create(struct socket
*sock
, int family
,
2582 int type
, int protocol
, int kern
)
2584 return call_int_hook(socket_post_create
, 0, sock
, family
, type
,
2588 int security_socket_socketpair(struct socket
*socka
, struct socket
*sockb
)
2590 return call_int_hook(socket_socketpair
, 0, socka
, sockb
);
2592 EXPORT_SYMBOL(security_socket_socketpair
);
2594 int security_socket_bind(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
2596 return call_int_hook(socket_bind
, 0, sock
, address
, addrlen
);
2599 int security_socket_connect(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
2601 return call_int_hook(socket_connect
, 0, sock
, address
, addrlen
);
2604 int security_socket_listen(struct socket
*sock
, int backlog
)
2606 return call_int_hook(socket_listen
, 0, sock
, backlog
);
2609 int security_socket_accept(struct socket
*sock
, struct socket
*newsock
)
2611 return call_int_hook(socket_accept
, 0, sock
, newsock
);
2614 int security_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
, int size
)
2616 return call_int_hook(socket_sendmsg
, 0, sock
, msg
, size
);
2619 int security_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
2620 int size
, int flags
)
2622 return call_int_hook(socket_recvmsg
, 0, sock
, msg
, size
, flags
);
2625 int security_socket_getsockname(struct socket
*sock
)
2627 return call_int_hook(socket_getsockname
, 0, sock
);
2630 int security_socket_getpeername(struct socket
*sock
)
2632 return call_int_hook(socket_getpeername
, 0, sock
);
2635 int security_socket_getsockopt(struct socket
*sock
, int level
, int optname
)
2637 return call_int_hook(socket_getsockopt
, 0, sock
, level
, optname
);
2640 int security_socket_setsockopt(struct socket
*sock
, int level
, int optname
)
2642 return call_int_hook(socket_setsockopt
, 0, sock
, level
, optname
);
2645 int security_socket_shutdown(struct socket
*sock
, int how
)
2647 return call_int_hook(socket_shutdown
, 0, sock
, how
);
2650 int security_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2652 return call_int_hook(socket_sock_rcv_skb
, 0, sk
, skb
);
2654 EXPORT_SYMBOL(security_sock_rcv_skb
);
2656 int security_socket_getpeersec_stream(struct socket
*sock
, char __user
*optval
,
2657 int __user
*optlen
, unsigned len
)
2659 int display
= lsm_task_display(current
);
2660 struct security_hook_list
*hp
;
2662 hlist_for_each_entry(hp
, &security_hook_heads
.socket_getpeersec_stream
,
2664 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
)
2665 return hp
->hook
.socket_getpeersec_stream(sock
, optval
,
2667 return -ENOPROTOOPT
;
2670 int security_socket_getpeersec_dgram(struct socket
*sock
, struct sk_buff
*skb
,
2671 struct lsmblob
*blob
)
2673 struct security_hook_list
*hp
;
2674 int rc
= -ENOPROTOOPT
;
2676 hlist_for_each_entry(hp
, &security_hook_heads
.socket_getpeersec_dgram
,
2678 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2680 rc
= hp
->hook
.socket_getpeersec_dgram(sock
, skb
,
2681 &blob
->secid
[hp
->lsmid
->slot
]);
2687 EXPORT_SYMBOL(security_socket_getpeersec_dgram
);
2689 int security_sk_alloc(struct sock
*sk
, int family
, gfp_t priority
)
2691 int rc
= lsm_sock_alloc(sk
, priority
);
2695 rc
= call_int_hook(sk_alloc_security
, 0, sk
, family
, priority
);
2697 security_sk_free(sk
);
2701 void security_sk_free(struct sock
*sk
)
2703 call_void_hook(sk_free_security
, sk
);
2704 kfree(sk
->sk_security
);
2705 sk
->sk_security
= NULL
;
2708 void security_sk_clone(const struct sock
*sk
, struct sock
*newsk
)
2710 call_void_hook(sk_clone_security
, sk
, newsk
);
2712 EXPORT_SYMBOL(security_sk_clone
);
2714 void security_sk_classify_flow(struct sock
*sk
, struct flowi_common
*flic
)
2716 call_void_hook(sk_getsecid
, sk
, &flic
->flowic_secid
);
2718 EXPORT_SYMBOL(security_sk_classify_flow
);
2720 void security_req_classify_flow(const struct request_sock
*req
,
2721 struct flowi_common
*flic
)
2723 call_void_hook(req_classify_flow
, req
, flic
);
2725 EXPORT_SYMBOL(security_req_classify_flow
);
2727 void security_sock_graft(struct sock
*sk
, struct socket
*parent
)
2729 call_void_hook(sock_graft
, sk
, parent
);
2731 EXPORT_SYMBOL(security_sock_graft
);
2733 int security_inet_conn_request(const struct sock
*sk
,
2734 struct sk_buff
*skb
, struct request_sock
*req
)
2736 return call_int_hook(inet_conn_request
, 0, sk
, skb
, req
);
2738 EXPORT_SYMBOL(security_inet_conn_request
);
2740 void security_inet_csk_clone(struct sock
*newsk
,
2741 const struct request_sock
*req
)
2743 call_void_hook(inet_csk_clone
, newsk
, req
);
2746 void security_inet_conn_established(struct sock
*sk
,
2747 struct sk_buff
*skb
)
2749 call_void_hook(inet_conn_established
, sk
, skb
);
2751 EXPORT_SYMBOL(security_inet_conn_established
);
2753 int security_secmark_relabel_packet(struct lsmblob
*blob
)
2755 struct security_hook_list
*hp
;
2758 hlist_for_each_entry(hp
, &security_hook_heads
.secmark_relabel_packet
,
2760 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2762 rc
= hp
->hook
.secmark_relabel_packet(
2763 blob
->secid
[hp
->lsmid
->slot
]);
2769 EXPORT_SYMBOL(security_secmark_relabel_packet
);
2771 void security_secmark_refcount_inc(void)
2773 call_void_hook(secmark_refcount_inc
);
2775 EXPORT_SYMBOL(security_secmark_refcount_inc
);
2777 void security_secmark_refcount_dec(void)
2779 call_void_hook(secmark_refcount_dec
);
2781 EXPORT_SYMBOL(security_secmark_refcount_dec
);
2783 int security_tun_dev_alloc_security(void **security
)
2785 return call_int_hook(tun_dev_alloc_security
, 0, security
);
2787 EXPORT_SYMBOL(security_tun_dev_alloc_security
);
2789 void security_tun_dev_free_security(void *security
)
2791 call_void_hook(tun_dev_free_security
, security
);
2793 EXPORT_SYMBOL(security_tun_dev_free_security
);
2795 int security_tun_dev_create(void)
2797 return call_int_hook(tun_dev_create
, 0);
2799 EXPORT_SYMBOL(security_tun_dev_create
);
2801 int security_tun_dev_attach_queue(void *security
)
2803 return call_int_hook(tun_dev_attach_queue
, 0, security
);
2805 EXPORT_SYMBOL(security_tun_dev_attach_queue
);
2807 int security_tun_dev_attach(struct sock
*sk
, void *security
)
2809 return call_int_hook(tun_dev_attach
, 0, sk
, security
);
2811 EXPORT_SYMBOL(security_tun_dev_attach
);
2813 int security_tun_dev_open(void *security
)
2815 return call_int_hook(tun_dev_open
, 0, security
);
2817 EXPORT_SYMBOL(security_tun_dev_open
);
2819 int security_sctp_assoc_request(struct sctp_endpoint
*ep
, struct sk_buff
*skb
)
2821 return call_int_hook(sctp_assoc_request
, 0, ep
, skb
);
2823 EXPORT_SYMBOL(security_sctp_assoc_request
);
2825 int security_sctp_bind_connect(struct sock
*sk
, int optname
,
2826 struct sockaddr
*address
, int addrlen
)
2828 return call_int_hook(sctp_bind_connect
, 0, sk
, optname
,
2831 EXPORT_SYMBOL(security_sctp_bind_connect
);
2833 void security_sctp_sk_clone(struct sctp_endpoint
*ep
, struct sock
*sk
,
2836 call_void_hook(sctp_sk_clone
, ep
, sk
, newsk
);
2838 EXPORT_SYMBOL(security_sctp_sk_clone
);
2840 #endif /* CONFIG_SECURITY_NETWORK */
2842 #ifdef CONFIG_SECURITY_INFINIBAND
2844 int security_ib_pkey_access(void *sec
, u64 subnet_prefix
, u16 pkey
)
2846 return call_int_hook(ib_pkey_access
, 0, sec
, subnet_prefix
, pkey
);
2848 EXPORT_SYMBOL(security_ib_pkey_access
);
2850 int security_ib_endport_manage_subnet(void *sec
, const char *dev_name
, u8 port_num
)
2852 return call_int_hook(ib_endport_manage_subnet
, 0, sec
, dev_name
, port_num
);
2854 EXPORT_SYMBOL(security_ib_endport_manage_subnet
);
2856 int security_ib_alloc_security(void **sec
)
2858 return call_int_hook(ib_alloc_security
, 0, sec
);
2860 EXPORT_SYMBOL(security_ib_alloc_security
);
2862 void security_ib_free_security(void *sec
)
2864 call_void_hook(ib_free_security
, sec
);
2866 EXPORT_SYMBOL(security_ib_free_security
);
2867 #endif /* CONFIG_SECURITY_INFINIBAND */
2869 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2871 int security_xfrm_policy_alloc(struct xfrm_sec_ctx
**ctxp
,
2872 struct xfrm_user_sec_ctx
*sec_ctx
,
2875 return call_int_hook(xfrm_policy_alloc_security
, 0, ctxp
, sec_ctx
, gfp
);
2877 EXPORT_SYMBOL(security_xfrm_policy_alloc
);
2879 int security_xfrm_policy_clone(struct xfrm_sec_ctx
*old_ctx
,
2880 struct xfrm_sec_ctx
**new_ctxp
)
2882 return call_int_hook(xfrm_policy_clone_security
, 0, old_ctx
, new_ctxp
);
2885 void security_xfrm_policy_free(struct xfrm_sec_ctx
*ctx
)
2887 call_void_hook(xfrm_policy_free_security
, ctx
);
2889 EXPORT_SYMBOL(security_xfrm_policy_free
);
2891 int security_xfrm_policy_delete(struct xfrm_sec_ctx
*ctx
)
2893 return call_int_hook(xfrm_policy_delete_security
, 0, ctx
);
2896 int security_xfrm_state_alloc(struct xfrm_state
*x
,
2897 struct xfrm_user_sec_ctx
*sec_ctx
)
2899 return call_int_hook(xfrm_state_alloc
, 0, x
, sec_ctx
);
2901 EXPORT_SYMBOL(security_xfrm_state_alloc
);
2903 int security_xfrm_state_alloc_acquire(struct xfrm_state
*x
,
2904 struct xfrm_sec_ctx
*polsec
, u32 secid
)
2906 return call_int_hook(xfrm_state_alloc_acquire
, 0, x
, polsec
, secid
);
2909 int security_xfrm_state_delete(struct xfrm_state
*x
)
2911 return call_int_hook(xfrm_state_delete_security
, 0, x
);
2913 EXPORT_SYMBOL(security_xfrm_state_delete
);
2915 void security_xfrm_state_free(struct xfrm_state
*x
)
2917 call_void_hook(xfrm_state_free_security
, x
);
2920 int security_xfrm_policy_lookup(struct xfrm_sec_ctx
*ctx
, u32 fl_secid
)
2922 return call_int_hook(xfrm_policy_lookup
, 0, ctx
, fl_secid
);
2925 int security_xfrm_state_pol_flow_match(struct xfrm_state
*x
,
2926 struct xfrm_policy
*xp
,
2927 const struct flowi_common
*flic
)
2929 struct security_hook_list
*hp
;
2930 int rc
= LSM_RET_DEFAULT(xfrm_state_pol_flow_match
);
2933 * Since this function is expected to return 0 or 1, the judgment
2934 * becomes difficult if multiple LSMs supply this call. Fortunately,
2935 * we can use the first LSM's judgment because currently only SELinux
2936 * supplies this call.
2938 * For speed optimization, we explicitly break the loop rather than
2941 hlist_for_each_entry(hp
, &security_hook_heads
.xfrm_state_pol_flow_match
,
2943 rc
= hp
->hook
.xfrm_state_pol_flow_match(x
, xp
, flic
);
2949 int security_xfrm_decode_session(struct sk_buff
*skb
, u32
*secid
)
2951 return call_int_hook(xfrm_decode_session
, 0, skb
, secid
, 1);
2954 void security_skb_classify_flow(struct sk_buff
*skb
, struct flowi_common
*flic
)
2956 int rc
= call_int_hook(xfrm_decode_session
, 0, skb
, &flic
->flowic_secid
,
2961 EXPORT_SYMBOL(security_skb_classify_flow
);
2963 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
2967 int security_key_alloc(struct key
*key
, const struct cred
*cred
,
2968 unsigned long flags
)
2970 return call_int_hook(key_alloc
, 0, key
, cred
, flags
);
2973 void security_key_free(struct key
*key
)
2975 call_void_hook(key_free
, key
);
2978 int security_key_permission(key_ref_t key_ref
, const struct cred
*cred
,
2979 enum key_need_perm need_perm
)
2981 return call_int_hook(key_permission
, 0, key_ref
, cred
, need_perm
);
2984 int security_key_getsecurity(struct key
*key
, char **_buffer
)
2987 return call_int_hook(key_getsecurity
, 0, key
, _buffer
);
2990 #endif /* CONFIG_KEYS */
2994 int security_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **lsmrule
)
2996 struct security_hook_list
*hp
;
2997 int display
= lsm_task_display(current
);
2999 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_init
, list
) {
3000 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
3002 if (display
!= LSMBLOB_INVALID
&& display
!= hp
->lsmid
->slot
)
3004 return hp
->hook
.audit_rule_init(field
, op
, rulestr
,
3005 &lsmrule
[hp
->lsmid
->slot
]);
3010 int security_audit_rule_known(struct audit_krule
*krule
)
3012 return call_int_hook(audit_rule_known
, 0, krule
);
3015 void security_audit_rule_free(void **lsmrule
)
3017 struct security_hook_list
*hp
;
3019 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_free
, list
) {
3020 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
3022 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3024 hp
->hook
.audit_rule_free(lsmrule
[hp
->lsmid
->slot
]);
3028 int security_audit_rule_match(struct lsmblob
*blob
, u32 field
, u32 op
,
3031 struct security_hook_list
*hp
;
3034 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_match
, list
) {
3035 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
3037 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3039 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3041 rc
= hp
->hook
.audit_rule_match(blob
->secid
[hp
->lsmid
->slot
],
3043 &lsmrule
[hp
->lsmid
->slot
]);
3049 #endif /* CONFIG_AUDIT */
3051 #ifdef CONFIG_BPF_SYSCALL
3052 int security_bpf(int cmd
, union bpf_attr
*attr
, unsigned int size
)
3054 return call_int_hook(bpf
, 0, cmd
, attr
, size
);
3056 int security_bpf_map(struct bpf_map
*map
, fmode_t fmode
)
3058 return call_int_hook(bpf_map
, 0, map
, fmode
);
3060 int security_bpf_prog(struct bpf_prog
*prog
)
3062 return call_int_hook(bpf_prog
, 0, prog
);
3064 int security_bpf_map_alloc(struct bpf_map
*map
)
3066 return call_int_hook(bpf_map_alloc_security
, 0, map
);
3068 int security_bpf_prog_alloc(struct bpf_prog_aux
*aux
)
3070 return call_int_hook(bpf_prog_alloc_security
, 0, aux
);
3072 void security_bpf_map_free(struct bpf_map
*map
)
3074 call_void_hook(bpf_map_free_security
, map
);
3076 void security_bpf_prog_free(struct bpf_prog_aux
*aux
)
3078 call_void_hook(bpf_prog_free_security
, aux
);
3080 #endif /* CONFIG_BPF_SYSCALL */
3082 int security_locked_down(enum lockdown_reason what
)
3084 return call_int_hook(locked_down
, 0, what
);
3086 EXPORT_SYMBOL(security_locked_down
);
3088 int security_lock_kernel_down(const char *where
, enum lockdown_reason level
)
3090 return call_int_hook(lock_kernel_down
, 0, where
, level
);
3092 EXPORT_SYMBOL(security_lock_kernel_down
);
3094 #ifdef CONFIG_PERF_EVENTS
3095 int security_perf_event_open(struct perf_event_attr
*attr
, int type
)
3097 return call_int_hook(perf_event_open
, 0, attr
, type
);
3100 int security_perf_event_alloc(struct perf_event
*event
)
3102 return call_int_hook(perf_event_alloc
, 0, event
);
3105 void security_perf_event_free(struct perf_event
*event
)
3107 call_void_hook(perf_event_free
, event
);
3110 int security_perf_event_read(struct perf_event
*event
)
3112 return call_int_hook(perf_event_read
, 0, event
);
3115 int security_perf_event_write(struct perf_event
*event
)
3117 return call_int_hook(perf_event_write
, 0, event
);
3119 #endif /* CONFIG_PERF_EVENTS */