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_INTEGRITY_MAX
] = "integrity",
64 [LOCKDOWN_KCORE
] = "/proc/kcore access",
65 [LOCKDOWN_KPROBES
] = "use of kprobes",
66 [LOCKDOWN_BPF_READ_KERNEL
] = "use of bpf to read kernel RAM",
67 [LOCKDOWN_PERF
] = "unsafe use of perf",
68 [LOCKDOWN_TRACEFS
] = "use of tracefs",
69 [LOCKDOWN_XMON_RW
] = "xmon read and write access",
70 [LOCKDOWN_XFRM_SECRET
] = "xfrm SA secret",
71 [LOCKDOWN_CONFIDENTIALITY_MAX
] = "confidentiality",
74 struct security_hook_heads security_hook_heads __lsm_ro_after_init
;
75 static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain
);
77 static struct kmem_cache
*lsm_file_cache
;
78 static struct kmem_cache
*lsm_inode_cache
;
83 * The task blob includes the "display" slot used for
84 * chosing which module presents contexts.
86 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init
= {
87 .lbs_task
= sizeof(int),
90 /* Boot-time LSM user choice */
91 static __initdata
const char *chosen_lsm_order
;
92 static __initdata
const char *chosen_major_lsm
;
94 static __initconst
const char * const builtin_lsm_order
= CONFIG_LSM
;
96 /* Ordered list of LSMs to initialize. */
97 static __initdata
struct lsm_info
**ordered_lsms
;
98 static __initdata
struct lsm_info
*exclusive
;
100 static __initdata
bool debug
;
101 #define init_debug(...) \
104 pr_info(__VA_ARGS__); \
107 static bool __init
is_enabled(struct lsm_info
*lsm
)
112 return *lsm
->enabled
;
115 /* Mark an LSM's enabled flag. */
116 static int lsm_enabled_true __initdata
= 1;
117 static int lsm_enabled_false __initdata
= 0;
118 static void __init
set_enabled(struct lsm_info
*lsm
, bool enabled
)
121 * When an LSM hasn't configured an enable variable, we can use
122 * a hard-coded location for storing the default enabled state.
126 lsm
->enabled
= &lsm_enabled_true
;
128 lsm
->enabled
= &lsm_enabled_false
;
129 } else if (lsm
->enabled
== &lsm_enabled_true
) {
131 lsm
->enabled
= &lsm_enabled_false
;
132 } else if (lsm
->enabled
== &lsm_enabled_false
) {
134 lsm
->enabled
= &lsm_enabled_true
;
136 *lsm
->enabled
= enabled
;
140 /* Is an LSM already listed in the ordered LSMs list? */
141 static bool __init
exists_ordered_lsm(struct lsm_info
*lsm
)
143 struct lsm_info
**check
;
145 for (check
= ordered_lsms
; *check
; check
++)
152 /* Append an LSM to the list of ordered LSMs to initialize. */
153 static int last_lsm __initdata
;
154 static void __init
append_ordered_lsm(struct lsm_info
*lsm
, const char *from
)
156 /* Ignore duplicate selections. */
157 if (exists_ordered_lsm(lsm
))
160 if (WARN(last_lsm
== LSM_COUNT
, "%s: out of LSM slots!?\n", from
))
163 /* Enable this LSM, if it is not already set. */
165 lsm
->enabled
= &lsm_enabled_true
;
166 ordered_lsms
[last_lsm
++] = lsm
;
168 init_debug("%s ordering: %s (%sabled)\n", from
, lsm
->name
,
169 is_enabled(lsm
) ? "en" : "dis");
172 /* Is an LSM allowed to be initialized? */
173 static bool __init
lsm_allowed(struct lsm_info
*lsm
)
175 /* Skip if the LSM is disabled. */
176 if (!is_enabled(lsm
))
179 /* Not allowed if another exclusive LSM already initialized. */
180 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && exclusive
) {
181 init_debug("exclusive disabled: %s\n", lsm
->name
);
188 static void __init
lsm_set_blob_size(int *need
, int *lbs
)
199 static void __init
lsm_set_blob_sizes(struct lsm_blob_sizes
*needed
)
204 lsm_set_blob_size(&needed
->lbs_cred
, &blob_sizes
.lbs_cred
);
205 lsm_set_blob_size(&needed
->lbs_file
, &blob_sizes
.lbs_file
);
207 * The inode blob gets an rcu_head in addition to
208 * what the modules might need.
210 if (needed
->lbs_inode
&& blob_sizes
.lbs_inode
== 0)
211 blob_sizes
.lbs_inode
= sizeof(struct rcu_head
);
212 lsm_set_blob_size(&needed
->lbs_inode
, &blob_sizes
.lbs_inode
);
213 lsm_set_blob_size(&needed
->lbs_ipc
, &blob_sizes
.lbs_ipc
);
214 lsm_set_blob_size(&needed
->lbs_msg_msg
, &blob_sizes
.lbs_msg_msg
);
215 lsm_set_blob_size(&needed
->lbs_superblock
, &blob_sizes
.lbs_superblock
);
216 lsm_set_blob_size(&needed
->lbs_sock
, &blob_sizes
.lbs_sock
);
217 lsm_set_blob_size(&needed
->lbs_task
, &blob_sizes
.lbs_task
);
220 /* Prepare LSM for initialization. */
221 static void __init
prepare_lsm(struct lsm_info
*lsm
)
223 int enabled
= lsm_allowed(lsm
);
225 /* Record enablement (to handle any following exclusive LSMs). */
226 set_enabled(lsm
, enabled
);
228 /* If enabled, do pre-initialization work. */
230 if ((lsm
->flags
& LSM_FLAG_EXCLUSIVE
) && !exclusive
) {
232 init_debug("exclusive chosen: %s\n", lsm
->name
);
235 lsm_set_blob_sizes(lsm
->blobs
);
239 /* Initialize a given LSM, if it is enabled. */
240 static void __init
initialize_lsm(struct lsm_info
*lsm
)
242 if (is_enabled(lsm
)) {
245 init_debug("initializing %s\n", lsm
->name
);
247 WARN(ret
, "%s failed to initialize: %d\n", lsm
->name
, ret
);
251 /* Populate ordered LSMs list from comma-separated LSM name list. */
252 static void __init
ordered_lsm_parse(const char *order
, const char *origin
)
254 struct lsm_info
*lsm
;
255 char *sep
, *name
, *next
;
257 /* LSM_ORDER_FIRST is always first. */
258 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
259 if (lsm
->order
== LSM_ORDER_FIRST
)
260 append_ordered_lsm(lsm
, "first");
263 /* Process "security=", if given. */
264 if (chosen_major_lsm
) {
265 struct lsm_info
*major
;
268 * To match the original "security=" behavior, this
269 * explicitly does NOT fallback to another Legacy Major
270 * if the selected one was separately disabled: disable
271 * all non-matching Legacy Major LSMs.
273 for (major
= __start_lsm_info
; major
< __end_lsm_info
;
275 if ((major
->flags
& LSM_FLAG_LEGACY_MAJOR
) &&
276 strcmp(major
->name
, chosen_major_lsm
) != 0) {
277 set_enabled(major
, false);
278 init_debug("security=%s disabled: %s\n",
279 chosen_major_lsm
, major
->name
);
284 sep
= kstrdup(order
, GFP_KERNEL
);
286 /* Walk the list, looking for matching LSMs. */
287 while ((name
= strsep(&next
, ",")) != NULL
) {
290 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
291 if (lsm
->order
== LSM_ORDER_MUTABLE
&&
292 strcmp(lsm
->name
, name
) == 0) {
293 append_ordered_lsm(lsm
, origin
);
299 init_debug("%s ignored: %s\n", origin
, name
);
302 /* Process "security=", if given. */
303 if (chosen_major_lsm
) {
304 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
305 if (exists_ordered_lsm(lsm
))
307 if (strcmp(lsm
->name
, chosen_major_lsm
) == 0)
308 append_ordered_lsm(lsm
, "security=");
312 /* Disable all LSMs not in the ordered list. */
313 for (lsm
= __start_lsm_info
; lsm
< __end_lsm_info
; lsm
++) {
314 if (exists_ordered_lsm(lsm
))
316 set_enabled(lsm
, false);
317 init_debug("%s disabled: %s\n", origin
, lsm
->name
);
323 static void __init
lsm_early_cred(struct cred
*cred
);
324 static void __init
lsm_early_task(struct task_struct
*task
);
326 static int lsm_append(const char *new, char **result
);
328 static void __init
ordered_lsm_init(void)
330 struct lsm_info
**lsm
;
332 ordered_lsms
= kcalloc(LSM_COUNT
+ 1, sizeof(*ordered_lsms
),
335 if (chosen_lsm_order
) {
336 if (chosen_major_lsm
) {
337 pr_info("security= is ignored because it is superseded by lsm=\n");
338 chosen_major_lsm
= NULL
;
340 ordered_lsm_parse(chosen_lsm_order
, "cmdline");
342 ordered_lsm_parse(builtin_lsm_order
, "builtin");
344 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
347 init_debug("cred blob size = %d\n", blob_sizes
.lbs_cred
);
348 init_debug("file blob size = %d\n", blob_sizes
.lbs_file
);
349 init_debug("inode blob size = %d\n", blob_sizes
.lbs_inode
);
350 init_debug("ipc blob size = %d\n", blob_sizes
.lbs_ipc
);
351 init_debug("msg_msg blob size = %d\n", blob_sizes
.lbs_msg_msg
);
352 init_debug("superblock blob size = %d\n", blob_sizes
.lbs_superblock
);
353 init_debug("sock blob size = %d\n", blob_sizes
.lbs_sock
);
354 init_debug("task blob size = %d\n", blob_sizes
.lbs_task
);
355 init_debug("lsmblob size = %zu\n", sizeof(struct lsmblob
));
358 * Create any kmem_caches needed for blobs
360 if (blob_sizes
.lbs_file
)
361 lsm_file_cache
= kmem_cache_create("lsm_file_cache",
362 blob_sizes
.lbs_file
, 0,
364 if (blob_sizes
.lbs_inode
)
365 lsm_inode_cache
= kmem_cache_create("lsm_inode_cache",
366 blob_sizes
.lbs_inode
, 0,
369 lsm_early_cred((struct cred
*) current
->cred
);
370 lsm_early_task(current
);
371 for (lsm
= ordered_lsms
; *lsm
; lsm
++)
372 initialize_lsm(*lsm
);
377 int __init
early_security_init(void)
380 struct hlist_head
*list
= (struct hlist_head
*) &security_hook_heads
;
381 struct lsm_info
*lsm
;
383 for (i
= 0; i
< sizeof(security_hook_heads
) / sizeof(struct hlist_head
);
385 INIT_HLIST_HEAD(&list
[i
]);
387 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
389 lsm
->enabled
= &lsm_enabled_true
;
398 * security_init - initializes the security framework
400 * This should be called early in the kernel initialization sequence.
402 int __init
security_init(void)
404 struct lsm_info
*lsm
;
406 pr_info("Security Framework initializing\n");
409 * Append the names of the early LSM modules now that kmalloc() is
412 for (lsm
= __start_early_lsm_info
; lsm
< __end_early_lsm_info
; lsm
++) {
414 lsm_append(lsm
->name
, &lsm_names
);
417 /* Load LSMs in specified order. */
423 /* Save user chosen LSM */
424 static int __init
choose_major_lsm(char *str
)
426 chosen_major_lsm
= str
;
429 __setup("security=", choose_major_lsm
);
431 /* Explicitly choose LSM initialization order. */
432 static int __init
choose_lsm_order(char *str
)
434 chosen_lsm_order
= str
;
437 __setup("lsm=", choose_lsm_order
);
439 /* Enable LSM order debugging. */
440 static int __init
enable_debug(char *str
)
445 __setup("lsm.debug", enable_debug
);
447 static bool match_last_lsm(const char *list
, const char *lsm
)
451 if (WARN_ON(!list
|| !lsm
))
453 last
= strrchr(list
, ',');
455 /* Pass the comma, strcmp() will check for '\0' */
459 return !strcmp(last
, lsm
);
462 static int lsm_append(const char *new, char **result
)
466 if (*result
== NULL
) {
467 *result
= kstrdup(new, GFP_KERNEL
);
471 /* Check if it is the last registered name */
472 if (match_last_lsm(*result
, new))
474 cp
= kasprintf(GFP_KERNEL
, "%s,%s", *result
, new);
484 * Current index to use while initializing the lsmblob secid list.
485 * Pointers to the LSM id structures for local use.
487 static int lsm_slot __lsm_ro_after_init
;
488 static struct lsm_id
*lsm_slotlist
[LSMBLOB_ENTRIES
] __lsm_ro_after_init
;
491 * security_lsm_slot_name - Get the name of the security module in a slot
492 * @slot: index into the "display" slot list.
494 * Provide the name of the security module associated with
497 * If @slot is LSMBLOB_INVALID return the value
498 * for slot 0 if it has been set, otherwise NULL.
500 * Returns a pointer to the name string or NULL.
502 const char *security_lsm_slot_name(int slot
)
504 if (slot
== LSMBLOB_INVALID
)
506 else if (slot
>= LSMBLOB_ENTRIES
|| slot
< 0)
509 if (lsm_slotlist
[slot
] == NULL
)
511 return lsm_slotlist
[slot
]->lsm
;
515 * security_add_hooks - Add a modules hooks to the hook lists.
516 * @hooks: the hooks to add
517 * @count: the number of hooks to add
518 * @lsmid: the the identification information for the security module
520 * Each LSM has to register its hooks with the infrastructure.
521 * If the LSM is using hooks that export secids allocate a slot
522 * for it in the lsmblob.
524 void __init
security_add_hooks(struct security_hook_list
*hooks
, int count
,
525 struct lsm_id
*lsmid
)
529 if (lsmid
->slot
== LSMBLOB_NEEDED
) {
530 if (lsm_slot
>= LSMBLOB_ENTRIES
)
531 panic("%s Too many LSMs registered.\n", __func__
);
532 lsm_slotlist
[lsm_slot
] = lsmid
;
533 lsmid
->slot
= lsm_slot
++;
534 init_debug("%s assigned lsmblob slot %d\n", lsmid
->lsm
,
538 for (i
= 0; i
< count
; i
++) {
539 hooks
[i
].lsmid
= lsmid
;
540 hlist_add_tail_rcu(&hooks
[i
].list
, hooks
[i
].head
);
544 * Don't try to append during early_security_init(), we'll come back
545 * and fix this up afterwards.
547 if (slab_is_available()) {
548 if (lsm_append(lsmid
->lsm
, &lsm_names
) < 0)
549 panic("%s - Cannot get early memory.\n", __func__
);
553 int call_blocking_lsm_notifier(enum lsm_event event
, void *data
)
555 return blocking_notifier_call_chain(&blocking_lsm_notifier_chain
,
558 EXPORT_SYMBOL(call_blocking_lsm_notifier
);
560 int register_blocking_lsm_notifier(struct notifier_block
*nb
)
562 return blocking_notifier_chain_register(&blocking_lsm_notifier_chain
,
565 EXPORT_SYMBOL(register_blocking_lsm_notifier
);
567 int unregister_blocking_lsm_notifier(struct notifier_block
*nb
)
569 return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain
,
572 EXPORT_SYMBOL(unregister_blocking_lsm_notifier
);
575 * lsm_cred_alloc - allocate a composite cred blob
576 * @cred: the cred that needs a blob
577 * @gfp: allocation type
579 * Allocate the cred blob for all the modules
581 * Returns 0, or -ENOMEM if memory can't be allocated.
583 static int lsm_cred_alloc(struct cred
*cred
, gfp_t gfp
)
585 if (blob_sizes
.lbs_cred
== 0) {
586 cred
->security
= NULL
;
590 cred
->security
= kzalloc(blob_sizes
.lbs_cred
, gfp
);
591 if (cred
->security
== NULL
)
597 * lsm_early_cred - during initialization allocate a composite cred blob
598 * @cred: the cred that needs a blob
600 * Allocate the cred blob for all the modules
602 static void __init
lsm_early_cred(struct cred
*cred
)
604 int rc
= lsm_cred_alloc(cred
, GFP_KERNEL
);
607 panic("%s: Early cred alloc failed.\n", __func__
);
611 * lsm_file_alloc - allocate a composite file blob
612 * @file: the file that needs a blob
614 * Allocate the file blob for all the modules
616 * Returns 0, or -ENOMEM if memory can't be allocated.
618 static int lsm_file_alloc(struct file
*file
)
620 if (!lsm_file_cache
) {
621 file
->f_security
= NULL
;
625 file
->f_security
= kmem_cache_zalloc(lsm_file_cache
, GFP_KERNEL
);
626 if (file
->f_security
== NULL
)
632 * lsm_inode_alloc - allocate a composite inode blob
633 * @inode: the inode that needs a blob
635 * Allocate the inode blob for all the modules
637 * Returns 0, or -ENOMEM if memory can't be allocated.
639 int lsm_inode_alloc(struct inode
*inode
)
641 if (!lsm_inode_cache
) {
642 inode
->i_security
= NULL
;
646 inode
->i_security
= kmem_cache_zalloc(lsm_inode_cache
, GFP_NOFS
);
647 if (inode
->i_security
== NULL
)
653 * lsm_task_alloc - allocate a composite task blob
654 * @task: the task that needs a blob
656 * Allocate the task blob for all the modules
658 * Returns 0, or -ENOMEM if memory can't be allocated.
660 static int lsm_task_alloc(struct task_struct
*task
)
664 if (blob_sizes
.lbs_task
== 0) {
665 task
->security
= NULL
;
669 task
->security
= kzalloc(blob_sizes
.lbs_task
, GFP_KERNEL
);
670 if (task
->security
== NULL
)
674 * The start of the task blob contains the "display" LSM slot number.
675 * Start with it set to the invalid slot number, indicating that the
676 * default first registered LSM be displayed.
678 display
= task
->security
;
679 *display
= LSMBLOB_INVALID
;
685 * lsm_ipc_alloc - allocate a composite ipc blob
686 * @kip: the ipc that needs a blob
688 * Allocate the ipc blob for all the modules
690 * Returns 0, or -ENOMEM if memory can't be allocated.
692 static int lsm_ipc_alloc(struct kern_ipc_perm
*kip
)
694 if (blob_sizes
.lbs_ipc
== 0) {
695 kip
->security
= NULL
;
699 kip
->security
= kzalloc(blob_sizes
.lbs_ipc
, GFP_KERNEL
);
700 if (kip
->security
== NULL
)
706 * lsm_msg_msg_alloc - allocate a composite msg_msg blob
707 * @mp: the msg_msg that needs a blob
709 * Allocate the ipc blob for all the modules
711 * Returns 0, or -ENOMEM if memory can't be allocated.
713 static int lsm_msg_msg_alloc(struct msg_msg
*mp
)
715 if (blob_sizes
.lbs_msg_msg
== 0) {
720 mp
->security
= kzalloc(blob_sizes
.lbs_msg_msg
, GFP_KERNEL
);
721 if (mp
->security
== NULL
)
727 * lsm_sock_alloc - allocate a composite sock blob
728 * @sock: the sock that needs a blob
729 * @priority: allocation mode
731 * Allocate the sock blob for all the modules
733 * Returns 0, or -ENOMEM if memory can't be allocated.
735 static int lsm_sock_alloc(struct sock
*sock
, gfp_t priority
)
737 if (blob_sizes
.lbs_sock
== 0) {
738 sock
->sk_security
= NULL
;
742 sock
->sk_security
= kzalloc(blob_sizes
.lbs_sock
, priority
);
743 if (sock
->sk_security
== NULL
)
749 * lsm_early_task - during initialization allocate a composite task blob
750 * @task: the task that needs a blob
752 * Allocate the task blob for all the modules
754 static void __init
lsm_early_task(struct task_struct
*task
)
756 int rc
= lsm_task_alloc(task
);
759 panic("%s: Early task alloc failed.\n", __func__
);
763 * append_ctx - append a lsm/context pair to a compound context
764 * @ctx: the existing compound context
765 * @ctxlen: size of the old context, including terminating nul byte
766 * @lsm: new lsm name, nul terminated
767 * @new: new context, possibly nul terminated
768 * @newlen: maximum size of @new
770 * replace @ctx with a new compound context, appending @newlsm and @new
771 * to @ctx. On exit the new data replaces the old, which is freed.
772 * @ctxlen is set to the new size, which includes a trailing nul byte.
774 * Returns 0 on success, -ENOMEM if no memory is available.
776 static int append_ctx(char **ctx
, int *ctxlen
, const char *lsm
, char *new,
784 llen
= strlen(lsm
) + 1;
786 * A security module may or may not provide a trailing nul on
787 * when returning a security context. There is no definition
788 * of which it should be, and there are modules that do it
791 nlen
= strnlen(new, newlen
);
793 flen
= *ctxlen
+ llen
+ nlen
+ 1;
794 final
= kzalloc(flen
, GFP_KERNEL
);
800 memcpy(final
, *ctx
, *ctxlen
);
802 memcpy(final
+ *ctxlen
, lsm
, llen
);
803 memcpy(final
+ *ctxlen
+ llen
, new, nlen
);
814 * lsm_superblock_alloc - allocate a composite superblock blob
815 * @sb: the superblock that needs a blob
817 * Allocate the superblock blob for all the modules
819 * Returns 0, or -ENOMEM if memory can't be allocated.
821 static int lsm_superblock_alloc(struct super_block
*sb
)
823 if (blob_sizes
.lbs_superblock
== 0) {
824 sb
->s_security
= NULL
;
828 sb
->s_security
= kzalloc(blob_sizes
.lbs_superblock
, GFP_KERNEL
);
829 if (sb
->s_security
== NULL
)
835 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
836 * can be accessed with:
838 * LSM_RET_DEFAULT(<hook_name>)
840 * The macros below define static constants for the default value of each
843 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
844 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
845 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
846 static const int LSM_RET_DEFAULT(NAME) = (DEFAULT);
847 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
848 DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
850 #include <linux/lsm_hook_defs.h>
854 * Hook list operation macros.
857 * This is a hook that does not return a value.
860 * This is a hook that returns a value.
863 #define call_void_hook(FUNC, ...) \
865 struct security_hook_list *P; \
867 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
868 P->hook.FUNC(__VA_ARGS__); \
871 #define call_int_hook(FUNC, IRC, ...) ({ \
874 struct security_hook_list *P; \
876 hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
877 RC = P->hook.FUNC(__VA_ARGS__); \
885 /* Security operations */
887 int security_binder_set_context_mgr(struct task_struct
*mgr
)
889 return call_int_hook(binder_set_context_mgr
, 0, mgr
);
891 EXPORT_SYMBOL(security_binder_set_context_mgr
);
894 * security_binder_transaction - Binder driver transaction check
895 * @from: source of the transaction
896 * @to: destination of the transaction
898 * Verify that the tasks have the same LSM "display", then
899 * call the security module hooks.
901 * Returns -EINVAL if the displays don't match, or the
902 * result of the security module checks.
904 int security_binder_transaction(struct task_struct
*from
,
905 struct task_struct
*to
)
907 int from_display
= lsm_task_display(from
);
908 int to_display
= lsm_task_display(to
);
911 * If the display is LSMBLOB_INVALID the first module that has
912 * an entry is used. This will be in the 0 slot.
914 * This is currently only required if the server has requested
915 * peer contexts, but it would be unwieldly to have too much of
916 * the binder driver detail here.
918 if (from_display
== LSMBLOB_INVALID
)
920 if (to_display
== LSMBLOB_INVALID
)
922 if (from_display
!= to_display
)
925 return call_int_hook(binder_transaction
, 0, from
, to
);
927 EXPORT_SYMBOL(security_binder_transaction
);
929 int security_binder_transfer_binder(struct task_struct
*from
,
930 struct task_struct
*to
)
932 return call_int_hook(binder_transfer_binder
, 0, from
, to
);
934 EXPORT_SYMBOL(security_binder_transfer_binder
);
936 int security_binder_transfer_file(struct task_struct
*from
,
937 struct task_struct
*to
, struct file
*file
)
939 return call_int_hook(binder_transfer_file
, 0, from
, to
, file
);
941 EXPORT_SYMBOL(security_binder_transfer_file
);
943 int security_ptrace_access_check(struct task_struct
*child
, unsigned int mode
)
945 return call_int_hook(ptrace_access_check
, 0, child
, mode
);
948 int security_ptrace_traceme(struct task_struct
*parent
)
950 return call_int_hook(ptrace_traceme
, 0, parent
);
953 int security_capget(struct task_struct
*target
,
954 kernel_cap_t
*effective
,
955 kernel_cap_t
*inheritable
,
956 kernel_cap_t
*permitted
)
958 return call_int_hook(capget
, 0, target
,
959 effective
, inheritable
, permitted
);
962 int security_capset(struct cred
*new, const struct cred
*old
,
963 const kernel_cap_t
*effective
,
964 const kernel_cap_t
*inheritable
,
965 const kernel_cap_t
*permitted
)
967 return call_int_hook(capset
, 0, new, old
,
968 effective
, inheritable
, permitted
);
971 int security_capable(const struct cred
*cred
,
972 struct user_namespace
*ns
,
976 return call_int_hook(capable
, 0, cred
, ns
, cap
, opts
);
979 int security_quotactl(int cmds
, int type
, int id
, struct super_block
*sb
)
981 return call_int_hook(quotactl
, 0, cmds
, type
, id
, sb
);
984 int security_quota_on(struct dentry
*dentry
)
986 return call_int_hook(quota_on
, 0, dentry
);
989 int security_syslog(int type
)
991 return call_int_hook(syslog
, 0, type
);
994 int security_settime64(const struct timespec64
*ts
, const struct timezone
*tz
)
996 return call_int_hook(settime
, 0, ts
, tz
);
999 int security_vm_enough_memory_mm(struct mm_struct
*mm
, long pages
)
1001 struct security_hook_list
*hp
;
1002 int cap_sys_admin
= 1;
1006 * The module will respond with a positive value if
1007 * it thinks the __vm_enough_memory() call should be
1008 * made with the cap_sys_admin set. If all of the modules
1009 * agree that it should be set it will. If any module
1010 * thinks it should not be set it won't.
1012 hlist_for_each_entry(hp
, &security_hook_heads
.vm_enough_memory
, list
) {
1013 rc
= hp
->hook
.vm_enough_memory(mm
, pages
);
1019 return __vm_enough_memory(mm
, pages
, cap_sys_admin
);
1022 int security_bprm_creds_for_exec(struct linux_binprm
*bprm
)
1024 return call_int_hook(bprm_creds_for_exec
, 0, bprm
);
1027 int security_bprm_creds_from_file(struct linux_binprm
*bprm
, struct file
*file
)
1029 return call_int_hook(bprm_creds_from_file
, 0, bprm
, file
);
1032 int security_bprm_check(struct linux_binprm
*bprm
)
1036 ret
= call_int_hook(bprm_check_security
, 0, bprm
);
1039 return ima_bprm_check(bprm
);
1042 void security_bprm_committing_creds(struct linux_binprm
*bprm
)
1044 call_void_hook(bprm_committing_creds
, bprm
);
1047 void security_bprm_committed_creds(struct linux_binprm
*bprm
)
1049 call_void_hook(bprm_committed_creds
, bprm
);
1052 int security_fs_context_dup(struct fs_context
*fc
, struct fs_context
*src_fc
)
1054 return call_int_hook(fs_context_dup
, 0, fc
, src_fc
);
1057 int security_fs_context_parse_param(struct fs_context
*fc
, struct fs_parameter
*param
)
1059 return call_int_hook(fs_context_parse_param
, -ENOPARAM
, fc
, param
);
1062 int security_sb_alloc(struct super_block
*sb
)
1064 int rc
= lsm_superblock_alloc(sb
);
1068 rc
= call_int_hook(sb_alloc_security
, 0, sb
);
1070 security_sb_free(sb
);
1074 void security_sb_delete(struct super_block
*sb
)
1076 call_void_hook(sb_delete
, sb
);
1079 void security_sb_free(struct super_block
*sb
)
1081 call_void_hook(sb_free_security
, sb
);
1082 kfree(sb
->s_security
);
1083 sb
->s_security
= NULL
;
1086 void security_free_mnt_opts(void **mnt_opts
)
1090 call_void_hook(sb_free_mnt_opts
, *mnt_opts
);
1093 EXPORT_SYMBOL(security_free_mnt_opts
);
1095 int security_sb_eat_lsm_opts(char *options
, void **mnt_opts
)
1097 return call_int_hook(sb_eat_lsm_opts
, 0, options
, mnt_opts
);
1099 EXPORT_SYMBOL(security_sb_eat_lsm_opts
);
1101 int security_sb_mnt_opts_compat(struct super_block
*sb
,
1104 return call_int_hook(sb_mnt_opts_compat
, 0, sb
, mnt_opts
);
1106 EXPORT_SYMBOL(security_sb_mnt_opts_compat
);
1108 int security_sb_remount(struct super_block
*sb
,
1111 return call_int_hook(sb_remount
, 0, sb
, mnt_opts
);
1113 EXPORT_SYMBOL(security_sb_remount
);
1115 int security_sb_kern_mount(struct super_block
*sb
)
1117 return call_int_hook(sb_kern_mount
, 0, sb
);
1120 int security_sb_show_options(struct seq_file
*m
, struct super_block
*sb
)
1122 return call_int_hook(sb_show_options
, 0, m
, sb
);
1125 int security_sb_statfs(struct dentry
*dentry
)
1127 return call_int_hook(sb_statfs
, 0, dentry
);
1130 int security_sb_mount(const char *dev_name
, const struct path
*path
,
1131 const char *type
, unsigned long flags
, void *data
)
1133 return call_int_hook(sb_mount
, 0, dev_name
, path
, type
, flags
, data
);
1136 int security_sb_umount(struct vfsmount
*mnt
, int flags
)
1138 return call_int_hook(sb_umount
, 0, mnt
, flags
);
1141 int security_sb_pivotroot(const struct path
*old_path
, const struct path
*new_path
)
1143 return call_int_hook(sb_pivotroot
, 0, old_path
, new_path
);
1146 int security_sb_set_mnt_opts(struct super_block
*sb
,
1148 unsigned long kern_flags
,
1149 unsigned long *set_kern_flags
)
1151 return call_int_hook(sb_set_mnt_opts
,
1152 mnt_opts
? -EOPNOTSUPP
: 0, sb
,
1153 mnt_opts
, kern_flags
, set_kern_flags
);
1155 EXPORT_SYMBOL(security_sb_set_mnt_opts
);
1157 int security_sb_clone_mnt_opts(const struct super_block
*oldsb
,
1158 struct super_block
*newsb
,
1159 unsigned long kern_flags
,
1160 unsigned long *set_kern_flags
)
1162 return call_int_hook(sb_clone_mnt_opts
, 0, oldsb
, newsb
,
1163 kern_flags
, set_kern_flags
);
1165 EXPORT_SYMBOL(security_sb_clone_mnt_opts
);
1167 int security_add_mnt_opt(const char *option
, const char *val
, int len
,
1170 return call_int_hook(sb_add_mnt_opt
, -EINVAL
,
1171 option
, val
, len
, mnt_opts
);
1173 EXPORT_SYMBOL(security_add_mnt_opt
);
1175 int security_move_mount(const struct path
*from_path
, const struct path
*to_path
)
1177 return call_int_hook(move_mount
, 0, from_path
, to_path
);
1180 int security_path_notify(const struct path
*path
, u64 mask
,
1181 unsigned int obj_type
)
1183 return call_int_hook(path_notify
, 0, path
, mask
, obj_type
);
1186 int security_inode_alloc(struct inode
*inode
)
1188 int rc
= lsm_inode_alloc(inode
);
1192 rc
= call_int_hook(inode_alloc_security
, 0, inode
);
1194 security_inode_free(inode
);
1198 static void inode_free_by_rcu(struct rcu_head
*head
)
1201 * The rcu head is at the start of the inode blob
1203 kmem_cache_free(lsm_inode_cache
, head
);
1206 void security_inode_free(struct inode
*inode
)
1208 integrity_inode_free(inode
);
1209 call_void_hook(inode_free_security
, inode
);
1211 * The inode may still be referenced in a path walk and
1212 * a call to security_inode_permission() can be made
1213 * after inode_free_security() is called. Ideally, the VFS
1214 * wouldn't do this, but fixing that is a much harder
1215 * job. For now, simply free the i_security via RCU, and
1216 * leave the current inode->i_security pointer intact.
1217 * The inode will be freed after the RCU grace period too.
1219 if (inode
->i_security
)
1220 call_rcu((struct rcu_head
*)inode
->i_security
,
1224 int security_dentry_init_security(struct dentry
*dentry
, int mode
,
1225 const struct qstr
*name
, void **ctx
,
1228 return call_int_hook(dentry_init_security
, -EOPNOTSUPP
, dentry
, mode
,
1231 EXPORT_SYMBOL(security_dentry_init_security
);
1233 int security_dentry_create_files_as(struct dentry
*dentry
, int mode
,
1235 const struct cred
*old
, struct cred
*new)
1237 return call_int_hook(dentry_create_files_as
, 0, dentry
, mode
,
1240 EXPORT_SYMBOL(security_dentry_create_files_as
);
1242 int security_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1243 const struct qstr
*qstr
,
1244 const initxattrs initxattrs
, void *fs_data
)
1246 struct xattr new_xattrs
[MAX_LSM_EVM_XATTR
+ 1];
1247 struct xattr
*lsm_xattr
, *evm_xattr
, *xattr
;
1250 if (unlikely(IS_PRIVATE(inode
)))
1254 return call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
,
1255 dir
, qstr
, NULL
, NULL
, NULL
);
1256 memset(new_xattrs
, 0, sizeof(new_xattrs
));
1257 lsm_xattr
= new_xattrs
;
1258 ret
= call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
, dir
, qstr
,
1261 &lsm_xattr
->value_len
);
1265 evm_xattr
= lsm_xattr
+ 1;
1266 ret
= evm_inode_init_security(inode
, lsm_xattr
, evm_xattr
);
1269 ret
= initxattrs(inode
, new_xattrs
, fs_data
);
1271 for (xattr
= new_xattrs
; xattr
->value
!= NULL
; xattr
++)
1272 kfree(xattr
->value
);
1273 return (ret
== -EOPNOTSUPP
) ? 0 : ret
;
1275 EXPORT_SYMBOL(security_inode_init_security
);
1277 int security_inode_init_security_anon(struct inode
*inode
,
1278 const struct qstr
*name
,
1279 const struct inode
*context_inode
)
1281 return call_int_hook(inode_init_security_anon
, 0, inode
, name
,
1285 int security_old_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1286 const struct qstr
*qstr
, const char **name
,
1287 void **value
, size_t *len
)
1289 if (unlikely(IS_PRIVATE(inode
)))
1291 return call_int_hook(inode_init_security
, -EOPNOTSUPP
, inode
, dir
,
1292 qstr
, name
, value
, len
);
1294 EXPORT_SYMBOL(security_old_inode_init_security
);
1296 #ifdef CONFIG_SECURITY_PATH
1297 int security_path_mknod(const struct path
*dir
, struct dentry
*dentry
, umode_t mode
,
1300 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1302 return call_int_hook(path_mknod
, 0, dir
, dentry
, mode
, dev
);
1304 EXPORT_SYMBOL(security_path_mknod
);
1306 int security_path_mkdir(const struct path
*dir
, struct dentry
*dentry
, umode_t mode
)
1308 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1310 return call_int_hook(path_mkdir
, 0, dir
, dentry
, mode
);
1312 EXPORT_SYMBOL(security_path_mkdir
);
1314 int security_path_rmdir(const struct path
*dir
, struct dentry
*dentry
)
1316 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1318 return call_int_hook(path_rmdir
, 0, dir
, dentry
);
1321 int security_path_unlink(const struct path
*dir
, struct dentry
*dentry
)
1323 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1325 return call_int_hook(path_unlink
, 0, dir
, dentry
);
1327 EXPORT_SYMBOL(security_path_unlink
);
1329 int security_path_symlink(const struct path
*dir
, struct dentry
*dentry
,
1330 const char *old_name
)
1332 if (unlikely(IS_PRIVATE(d_backing_inode(dir
->dentry
))))
1334 return call_int_hook(path_symlink
, 0, dir
, dentry
, old_name
);
1337 int security_path_link(struct dentry
*old_dentry
, const struct path
*new_dir
,
1338 struct dentry
*new_dentry
)
1340 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1342 return call_int_hook(path_link
, 0, old_dentry
, new_dir
, new_dentry
);
1345 int security_path_rename(const struct path
*old_dir
, struct dentry
*old_dentry
,
1346 const struct path
*new_dir
, struct dentry
*new_dentry
,
1349 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1350 (d_is_positive(new_dentry
) && IS_PRIVATE(d_backing_inode(new_dentry
)))))
1353 if (flags
& RENAME_EXCHANGE
) {
1354 int err
= call_int_hook(path_rename
, 0, new_dir
, new_dentry
,
1355 old_dir
, old_dentry
);
1360 return call_int_hook(path_rename
, 0, old_dir
, old_dentry
, new_dir
,
1363 EXPORT_SYMBOL(security_path_rename
);
1365 int security_path_truncate(const struct path
*path
)
1367 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1369 return call_int_hook(path_truncate
, 0, path
);
1372 int security_path_chmod(const struct path
*path
, umode_t mode
)
1374 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1376 return call_int_hook(path_chmod
, 0, path
, mode
);
1379 int security_path_chown(const struct path
*path
, kuid_t uid
, kgid_t gid
)
1381 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1383 return call_int_hook(path_chown
, 0, path
, uid
, gid
);
1386 int security_path_chroot(const struct path
*path
)
1388 return call_int_hook(path_chroot
, 0, path
);
1392 int security_inode_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1394 if (unlikely(IS_PRIVATE(dir
)))
1396 return call_int_hook(inode_create
, 0, dir
, dentry
, mode
);
1398 EXPORT_SYMBOL_GPL(security_inode_create
);
1400 int security_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1401 struct dentry
*new_dentry
)
1403 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
))))
1405 return call_int_hook(inode_link
, 0, old_dentry
, dir
, new_dentry
);
1408 int security_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1410 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1412 return call_int_hook(inode_unlink
, 0, dir
, dentry
);
1415 int security_inode_symlink(struct inode
*dir
, struct dentry
*dentry
,
1416 const char *old_name
)
1418 if (unlikely(IS_PRIVATE(dir
)))
1420 return call_int_hook(inode_symlink
, 0, dir
, dentry
, old_name
);
1423 int security_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1425 if (unlikely(IS_PRIVATE(dir
)))
1427 return call_int_hook(inode_mkdir
, 0, dir
, dentry
, mode
);
1429 EXPORT_SYMBOL_GPL(security_inode_mkdir
);
1431 int security_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1433 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1435 return call_int_hook(inode_rmdir
, 0, dir
, dentry
);
1438 int security_inode_mknod(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, dev_t dev
)
1440 if (unlikely(IS_PRIVATE(dir
)))
1442 return call_int_hook(inode_mknod
, 0, dir
, dentry
, mode
, dev
);
1445 int security_inode_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
1446 struct inode
*new_dir
, struct dentry
*new_dentry
,
1449 if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry
)) ||
1450 (d_is_positive(new_dentry
) && IS_PRIVATE(d_backing_inode(new_dentry
)))))
1453 if (flags
& RENAME_EXCHANGE
) {
1454 int err
= call_int_hook(inode_rename
, 0, new_dir
, new_dentry
,
1455 old_dir
, old_dentry
);
1460 return call_int_hook(inode_rename
, 0, old_dir
, old_dentry
,
1461 new_dir
, new_dentry
);
1464 int security_inode_readlink(struct dentry
*dentry
)
1466 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1468 return call_int_hook(inode_readlink
, 0, dentry
);
1471 int security_inode_follow_link(struct dentry
*dentry
, struct inode
*inode
,
1474 if (unlikely(IS_PRIVATE(inode
)))
1476 return call_int_hook(inode_follow_link
, 0, dentry
, inode
, rcu
);
1479 int security_inode_permission(struct inode
*inode
, int mask
)
1481 if (unlikely(IS_PRIVATE(inode
)))
1483 return call_int_hook(inode_permission
, 0, inode
, mask
);
1486 int security_inode_setattr(struct dentry
*dentry
, struct iattr
*attr
)
1490 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1492 ret
= call_int_hook(inode_setattr
, 0, dentry
, attr
);
1495 return evm_inode_setattr(dentry
, attr
);
1497 EXPORT_SYMBOL_GPL(security_inode_setattr
);
1499 int security_inode_getattr(const struct path
*path
)
1501 if (unlikely(IS_PRIVATE(d_backing_inode(path
->dentry
))))
1503 return call_int_hook(inode_getattr
, 0, path
);
1506 int security_inode_setxattr(struct user_namespace
*mnt_userns
,
1507 struct dentry
*dentry
, const char *name
,
1508 const void *value
, size_t size
, int flags
)
1512 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1515 * SELinux and Smack integrate the cap call,
1516 * so assume that all LSMs supplying this call do so.
1518 ret
= call_int_hook(inode_setxattr
, 1, mnt_userns
, dentry
, name
, value
,
1522 ret
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1525 ret
= ima_inode_setxattr(dentry
, name
, value
, size
);
1528 return evm_inode_setxattr(mnt_userns
, dentry
, name
, value
, size
);
1531 void security_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1532 const void *value
, size_t size
, int flags
)
1534 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1536 call_void_hook(inode_post_setxattr
, dentry
, name
, value
, size
, flags
);
1537 evm_inode_post_setxattr(dentry
, name
, value
, size
);
1540 int security_inode_getxattr(struct dentry
*dentry
, const char *name
)
1542 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1544 return call_int_hook(inode_getxattr
, 0, dentry
, name
);
1547 int security_inode_listxattr(struct dentry
*dentry
)
1549 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1551 return call_int_hook(inode_listxattr
, 0, dentry
);
1554 int security_inode_removexattr(struct user_namespace
*mnt_userns
,
1555 struct dentry
*dentry
, const char *name
)
1559 if (unlikely(IS_PRIVATE(d_backing_inode(dentry
))))
1562 * SELinux and Smack integrate the cap call,
1563 * so assume that all LSMs supplying this call do so.
1565 ret
= call_int_hook(inode_removexattr
, 1, mnt_userns
, dentry
, name
);
1567 ret
= cap_inode_removexattr(mnt_userns
, dentry
, name
);
1570 ret
= ima_inode_removexattr(dentry
, name
);
1573 return evm_inode_removexattr(mnt_userns
, dentry
, name
);
1576 int security_inode_need_killpriv(struct dentry
*dentry
)
1578 return call_int_hook(inode_need_killpriv
, 0, dentry
);
1581 int security_inode_killpriv(struct user_namespace
*mnt_userns
,
1582 struct dentry
*dentry
)
1584 return call_int_hook(inode_killpriv
, 0, mnt_userns
, dentry
);
1587 int security_inode_getsecurity(struct user_namespace
*mnt_userns
,
1588 struct inode
*inode
, const char *name
,
1589 void **buffer
, bool alloc
)
1591 struct security_hook_list
*hp
;
1594 if (unlikely(IS_PRIVATE(inode
)))
1595 return LSM_RET_DEFAULT(inode_getsecurity
);
1597 * Only one module will provide an attribute with a given name.
1599 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecurity
, list
) {
1600 rc
= hp
->hook
.inode_getsecurity(mnt_userns
, inode
, name
, buffer
, alloc
);
1601 if (rc
!= LSM_RET_DEFAULT(inode_getsecurity
))
1604 return LSM_RET_DEFAULT(inode_getsecurity
);
1607 int security_inode_setsecurity(struct inode
*inode
, const char *name
, const void *value
, size_t size
, int flags
)
1609 struct security_hook_list
*hp
;
1612 if (unlikely(IS_PRIVATE(inode
)))
1613 return LSM_RET_DEFAULT(inode_setsecurity
);
1615 * Only one module will provide an attribute with a given name.
1617 hlist_for_each_entry(hp
, &security_hook_heads
.inode_setsecurity
, list
) {
1618 rc
= hp
->hook
.inode_setsecurity(inode
, name
, value
, size
,
1620 if (rc
!= LSM_RET_DEFAULT(inode_setsecurity
))
1623 return LSM_RET_DEFAULT(inode_setsecurity
);
1626 int security_inode_listsecurity(struct inode
*inode
, char *buffer
, size_t buffer_size
)
1628 if (unlikely(IS_PRIVATE(inode
)))
1630 return call_int_hook(inode_listsecurity
, 0, inode
, buffer
, buffer_size
);
1632 EXPORT_SYMBOL(security_inode_listsecurity
);
1634 void security_inode_getsecid(struct inode
*inode
, struct lsmblob
*blob
)
1636 struct security_hook_list
*hp
;
1638 lsmblob_init(blob
, 0);
1639 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecid
, list
) {
1640 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1642 hp
->hook
.inode_getsecid(inode
, &blob
->secid
[hp
->lsmid
->slot
]);
1646 int security_inode_copy_up(struct dentry
*src
, struct cred
**new)
1648 return call_int_hook(inode_copy_up
, 0, src
, new);
1650 EXPORT_SYMBOL(security_inode_copy_up
);
1652 int security_inode_copy_up_xattr(const char *name
)
1654 struct security_hook_list
*hp
;
1658 * The implementation can return 0 (accept the xattr), 1 (discard the
1659 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
1660 * any other error code incase of an error.
1662 hlist_for_each_entry(hp
,
1663 &security_hook_heads
.inode_copy_up_xattr
, list
) {
1664 rc
= hp
->hook
.inode_copy_up_xattr(name
);
1665 if (rc
!= LSM_RET_DEFAULT(inode_copy_up_xattr
))
1669 return LSM_RET_DEFAULT(inode_copy_up_xattr
);
1671 EXPORT_SYMBOL(security_inode_copy_up_xattr
);
1673 int security_kernfs_init_security(struct kernfs_node
*kn_dir
,
1674 struct kernfs_node
*kn
)
1676 return call_int_hook(kernfs_init_security
, 0, kn_dir
, kn
);
1679 int security_file_permission(struct file
*file
, int mask
)
1683 ret
= call_int_hook(file_permission
, 0, file
, mask
);
1687 return fsnotify_perm(file
, mask
);
1690 int security_file_alloc(struct file
*file
)
1692 int rc
= lsm_file_alloc(file
);
1696 rc
= call_int_hook(file_alloc_security
, 0, file
);
1698 security_file_free(file
);
1702 void security_file_free(struct file
*file
)
1706 call_void_hook(file_free_security
, file
);
1708 blob
= file
->f_security
;
1710 file
->f_security
= NULL
;
1711 kmem_cache_free(lsm_file_cache
, blob
);
1715 int security_file_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1717 return call_int_hook(file_ioctl
, 0, file
, cmd
, arg
);
1719 EXPORT_SYMBOL_GPL(security_file_ioctl
);
1721 static inline unsigned long mmap_prot(struct file
*file
, unsigned long prot
)
1724 * Does we have PROT_READ and does the application expect
1725 * it to imply PROT_EXEC? If not, nothing to talk about...
1727 if ((prot
& (PROT_READ
| PROT_EXEC
)) != PROT_READ
)
1729 if (!(current
->personality
& READ_IMPLIES_EXEC
))
1732 * if that's an anonymous mapping, let it.
1735 return prot
| PROT_EXEC
;
1737 * ditto if it's not on noexec mount, except that on !MMU we need
1738 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
1740 if (!path_noexec(&file
->f_path
)) {
1742 if (file
->f_op
->mmap_capabilities
) {
1743 unsigned caps
= file
->f_op
->mmap_capabilities(file
);
1744 if (!(caps
& NOMMU_MAP_EXEC
))
1748 return prot
| PROT_EXEC
;
1750 /* anything on noexec mount won't get PROT_EXEC */
1754 int security_mmap_file(struct file
*file
, unsigned long prot
,
1755 unsigned long flags
)
1758 ret
= call_int_hook(mmap_file
, 0, file
, prot
,
1759 mmap_prot(file
, prot
), flags
);
1762 return ima_file_mmap(file
, prot
);
1765 int security_mmap_addr(unsigned long addr
)
1767 return call_int_hook(mmap_addr
, 0, addr
);
1770 int security_file_mprotect(struct vm_area_struct
*vma
, unsigned long reqprot
,
1775 ret
= call_int_hook(file_mprotect
, 0, vma
, reqprot
, prot
);
1778 return ima_file_mprotect(vma
, prot
);
1781 int security_file_lock(struct file
*file
, unsigned int cmd
)
1783 return call_int_hook(file_lock
, 0, file
, cmd
);
1786 int security_file_fcntl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
1788 return call_int_hook(file_fcntl
, 0, file
, cmd
, arg
);
1791 void security_file_set_fowner(struct file
*file
)
1793 call_void_hook(file_set_fowner
, file
);
1796 int security_file_send_sigiotask(struct task_struct
*tsk
,
1797 struct fown_struct
*fown
, int sig
)
1799 return call_int_hook(file_send_sigiotask
, 0, tsk
, fown
, sig
);
1802 int security_file_receive(struct file
*file
)
1804 return call_int_hook(file_receive
, 0, file
);
1807 int security_file_open(struct file
*file
)
1811 ret
= call_int_hook(file_open
, 0, file
);
1815 return fsnotify_perm(file
, MAY_OPEN
);
1818 int security_task_alloc(struct task_struct
*task
, unsigned long clone_flags
)
1820 int *odisplay
= current
->security
;
1822 int rc
= lsm_task_alloc(task
);
1827 rc
= call_int_hook(task_alloc
, 0, task
, clone_flags
);
1829 security_task_free(task
);
1834 ndisplay
= task
->security
;
1836 *ndisplay
= *odisplay
;
1842 void security_task_free(struct task_struct
*task
)
1844 call_void_hook(task_free
, task
);
1846 kfree(task
->security
);
1847 task
->security
= NULL
;
1850 int security_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1852 int rc
= lsm_cred_alloc(cred
, gfp
);
1857 rc
= call_int_hook(cred_alloc_blank
, 0, cred
, gfp
);
1859 security_cred_free(cred
);
1863 void security_cred_free(struct cred
*cred
)
1866 * There is a failure case in prepare_creds() that
1867 * may result in a call here with ->security being NULL.
1869 if (unlikely(cred
->security
== NULL
))
1872 call_void_hook(cred_free
, cred
);
1874 kfree(cred
->security
);
1875 cred
->security
= NULL
;
1878 int security_prepare_creds(struct cred
*new, const struct cred
*old
, gfp_t gfp
)
1880 int rc
= lsm_cred_alloc(new, gfp
);
1885 rc
= call_int_hook(cred_prepare
, 0, new, old
, gfp
);
1887 security_cred_free(new);
1891 void security_transfer_creds(struct cred
*new, const struct cred
*old
)
1893 call_void_hook(cred_transfer
, new, old
);
1896 void security_cred_getsecid(const struct cred
*c
, struct lsmblob
*blob
)
1898 struct security_hook_list
*hp
;
1900 lsmblob_init(blob
, 0);
1901 hlist_for_each_entry(hp
, &security_hook_heads
.cred_getsecid
, list
) {
1902 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1904 hp
->hook
.cred_getsecid(c
, &blob
->secid
[hp
->lsmid
->slot
]);
1907 EXPORT_SYMBOL(security_cred_getsecid
);
1909 int security_kernel_act_as(struct cred
*new, struct lsmblob
*blob
)
1911 struct security_hook_list
*hp
;
1914 hlist_for_each_entry(hp
, &security_hook_heads
.kernel_act_as
, list
) {
1915 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
1917 rc
= hp
->hook
.kernel_act_as(new, blob
->secid
[hp
->lsmid
->slot
]);
1924 int security_kernel_create_files_as(struct cred
*new, struct inode
*inode
)
1926 return call_int_hook(kernel_create_files_as
, 0, new, inode
);
1929 int security_kernel_module_request(char *kmod_name
)
1933 ret
= call_int_hook(kernel_module_request
, 0, kmod_name
);
1936 return integrity_kernel_module_request(kmod_name
);
1939 int security_kernel_read_file(struct file
*file
, enum kernel_read_file_id id
,
1944 ret
= call_int_hook(kernel_read_file
, 0, file
, id
, contents
);
1947 return ima_read_file(file
, id
, contents
);
1949 EXPORT_SYMBOL_GPL(security_kernel_read_file
);
1951 int security_kernel_post_read_file(struct file
*file
, char *buf
, loff_t size
,
1952 enum kernel_read_file_id id
)
1956 ret
= call_int_hook(kernel_post_read_file
, 0, file
, buf
, size
, id
);
1959 return ima_post_read_file(file
, buf
, size
, id
);
1961 EXPORT_SYMBOL_GPL(security_kernel_post_read_file
);
1963 int security_kernel_load_data(enum kernel_load_data_id id
, bool contents
)
1967 ret
= call_int_hook(kernel_load_data
, 0, id
, contents
);
1970 return ima_load_data(id
, contents
);
1972 EXPORT_SYMBOL_GPL(security_kernel_load_data
);
1974 int security_kernel_post_load_data(char *buf
, loff_t size
,
1975 enum kernel_load_data_id id
,
1980 ret
= call_int_hook(kernel_post_load_data
, 0, buf
, size
, id
,
1984 return ima_post_load_data(buf
, size
, id
, description
);
1986 EXPORT_SYMBOL_GPL(security_kernel_post_load_data
);
1988 int security_task_fix_setuid(struct cred
*new, const struct cred
*old
,
1991 return call_int_hook(task_fix_setuid
, 0, new, old
, flags
);
1994 int security_task_fix_setgid(struct cred
*new, const struct cred
*old
,
1997 return call_int_hook(task_fix_setgid
, 0, new, old
, flags
);
2000 int security_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2002 return call_int_hook(task_setpgid
, 0, p
, pgid
);
2005 int security_task_getpgid(struct task_struct
*p
)
2007 return call_int_hook(task_getpgid
, 0, p
);
2010 int security_task_getsid(struct task_struct
*p
)
2012 return call_int_hook(task_getsid
, 0, p
);
2015 void security_task_getsecid_subj(struct task_struct
*p
, struct lsmblob
*blob
)
2017 struct security_hook_list
*hp
;
2019 lsmblob_init(blob
, 0);
2020 hlist_for_each_entry(hp
, &security_hook_heads
.task_getsecid_subj
, list
) {
2021 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2023 hp
->hook
.task_getsecid_subj(p
, &blob
->secid
[hp
->lsmid
->slot
]);
2026 EXPORT_SYMBOL(security_task_getsecid_subj
);
2028 void security_task_getsecid_obj(struct task_struct
*p
, struct lsmblob
*blob
)
2030 struct security_hook_list
*hp
;
2032 lsmblob_init(blob
, 0);
2033 hlist_for_each_entry(hp
, &security_hook_heads
.task_getsecid_obj
, list
) {
2034 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2036 hp
->hook
.task_getsecid_obj(p
, &blob
->secid
[hp
->lsmid
->slot
]);
2039 EXPORT_SYMBOL(security_task_getsecid_obj
);
2041 int security_task_setnice(struct task_struct
*p
, int nice
)
2043 return call_int_hook(task_setnice
, 0, p
, nice
);
2046 int security_task_setioprio(struct task_struct
*p
, int ioprio
)
2048 return call_int_hook(task_setioprio
, 0, p
, ioprio
);
2051 int security_task_getioprio(struct task_struct
*p
)
2053 return call_int_hook(task_getioprio
, 0, p
);
2056 int security_task_prlimit(const struct cred
*cred
, const struct cred
*tcred
,
2059 return call_int_hook(task_prlimit
, 0, cred
, tcred
, flags
);
2062 int security_task_setrlimit(struct task_struct
*p
, unsigned int resource
,
2063 struct rlimit
*new_rlim
)
2065 return call_int_hook(task_setrlimit
, 0, p
, resource
, new_rlim
);
2068 int security_task_setscheduler(struct task_struct
*p
)
2070 return call_int_hook(task_setscheduler
, 0, p
);
2073 int security_task_getscheduler(struct task_struct
*p
)
2075 return call_int_hook(task_getscheduler
, 0, p
);
2078 int security_task_movememory(struct task_struct
*p
)
2080 return call_int_hook(task_movememory
, 0, p
);
2083 int security_task_kill(struct task_struct
*p
, struct kernel_siginfo
*info
,
2084 int sig
, const struct cred
*cred
)
2086 return call_int_hook(task_kill
, 0, p
, info
, sig
, cred
);
2089 int security_task_prctl(int option
, unsigned long arg2
, unsigned long arg3
,
2090 unsigned long arg4
, unsigned long arg5
)
2093 int rc
= LSM_RET_DEFAULT(task_prctl
);
2094 struct security_hook_list
*hp
;
2096 hlist_for_each_entry(hp
, &security_hook_heads
.task_prctl
, list
) {
2097 thisrc
= hp
->hook
.task_prctl(option
, arg2
, arg3
, arg4
, arg5
);
2098 if (thisrc
!= LSM_RET_DEFAULT(task_prctl
)) {
2107 void security_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2109 call_void_hook(task_to_inode
, p
, inode
);
2112 int security_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
2114 return call_int_hook(ipc_permission
, 0, ipcp
, flag
);
2117 void security_ipc_getsecid(struct kern_ipc_perm
*ipcp
, struct lsmblob
*blob
)
2119 struct security_hook_list
*hp
;
2121 lsmblob_init(blob
, 0);
2122 hlist_for_each_entry(hp
, &security_hook_heads
.ipc_getsecid
, list
) {
2123 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2125 hp
->hook
.ipc_getsecid(ipcp
, &blob
->secid
[hp
->lsmid
->slot
]);
2129 int security_msg_msg_alloc(struct msg_msg
*msg
)
2131 int rc
= lsm_msg_msg_alloc(msg
);
2135 rc
= call_int_hook(msg_msg_alloc_security
, 0, msg
);
2137 security_msg_msg_free(msg
);
2141 void security_msg_msg_free(struct msg_msg
*msg
)
2143 call_void_hook(msg_msg_free_security
, msg
);
2144 kfree(msg
->security
);
2145 msg
->security
= NULL
;
2148 int security_msg_queue_alloc(struct kern_ipc_perm
*msq
)
2150 int rc
= lsm_ipc_alloc(msq
);
2154 rc
= call_int_hook(msg_queue_alloc_security
, 0, msq
);
2156 security_msg_queue_free(msq
);
2160 void security_msg_queue_free(struct kern_ipc_perm
*msq
)
2162 call_void_hook(msg_queue_free_security
, msq
);
2163 kfree(msq
->security
);
2164 msq
->security
= NULL
;
2167 int security_msg_queue_associate(struct kern_ipc_perm
*msq
, int msqflg
)
2169 return call_int_hook(msg_queue_associate
, 0, msq
, msqflg
);
2172 int security_msg_queue_msgctl(struct kern_ipc_perm
*msq
, int cmd
)
2174 return call_int_hook(msg_queue_msgctl
, 0, msq
, cmd
);
2177 int security_msg_queue_msgsnd(struct kern_ipc_perm
*msq
,
2178 struct msg_msg
*msg
, int msqflg
)
2180 return call_int_hook(msg_queue_msgsnd
, 0, msq
, msg
, msqflg
);
2183 int security_msg_queue_msgrcv(struct kern_ipc_perm
*msq
, struct msg_msg
*msg
,
2184 struct task_struct
*target
, long type
, int mode
)
2186 return call_int_hook(msg_queue_msgrcv
, 0, msq
, msg
, target
, type
, mode
);
2189 int security_shm_alloc(struct kern_ipc_perm
*shp
)
2191 int rc
= lsm_ipc_alloc(shp
);
2195 rc
= call_int_hook(shm_alloc_security
, 0, shp
);
2197 security_shm_free(shp
);
2201 void security_shm_free(struct kern_ipc_perm
*shp
)
2203 call_void_hook(shm_free_security
, shp
);
2204 kfree(shp
->security
);
2205 shp
->security
= NULL
;
2208 int security_shm_associate(struct kern_ipc_perm
*shp
, int shmflg
)
2210 return call_int_hook(shm_associate
, 0, shp
, shmflg
);
2213 int security_shm_shmctl(struct kern_ipc_perm
*shp
, int cmd
)
2215 return call_int_hook(shm_shmctl
, 0, shp
, cmd
);
2218 int security_shm_shmat(struct kern_ipc_perm
*shp
, char __user
*shmaddr
, int shmflg
)
2220 return call_int_hook(shm_shmat
, 0, shp
, shmaddr
, shmflg
);
2223 int security_sem_alloc(struct kern_ipc_perm
*sma
)
2225 int rc
= lsm_ipc_alloc(sma
);
2229 rc
= call_int_hook(sem_alloc_security
, 0, sma
);
2231 security_sem_free(sma
);
2235 void security_sem_free(struct kern_ipc_perm
*sma
)
2237 call_void_hook(sem_free_security
, sma
);
2238 kfree(sma
->security
);
2239 sma
->security
= NULL
;
2242 int security_sem_associate(struct kern_ipc_perm
*sma
, int semflg
)
2244 return call_int_hook(sem_associate
, 0, sma
, semflg
);
2247 int security_sem_semctl(struct kern_ipc_perm
*sma
, int cmd
)
2249 return call_int_hook(sem_semctl
, 0, sma
, cmd
);
2252 int security_sem_semop(struct kern_ipc_perm
*sma
, struct sembuf
*sops
,
2253 unsigned nsops
, int alter
)
2255 return call_int_hook(sem_semop
, 0, sma
, sops
, nsops
, alter
);
2258 void security_d_instantiate(struct dentry
*dentry
, struct inode
*inode
)
2260 if (unlikely(inode
&& IS_PRIVATE(inode
)))
2262 call_void_hook(d_instantiate
, dentry
, inode
);
2264 EXPORT_SYMBOL(security_d_instantiate
);
2266 int security_getprocattr(struct task_struct
*p
, const char *lsm
, char *name
,
2269 struct security_hook_list
*hp
;
2274 int display
= lsm_task_display(current
);
2277 if (!strcmp(name
, "display")) {
2279 * lsm_slot will be 0 if there are no displaying modules.
2285 * Only allow getting the current process' display.
2286 * There are too few reasons to get another process'
2287 * display and too many LSM policy issues.
2292 display
= lsm_task_display(p
);
2293 if (display
!= LSMBLOB_INVALID
)
2295 *value
= kstrdup(lsm_slotlist
[slot
]->lsm
, GFP_KERNEL
);
2297 return strlen(*value
);
2301 if (!strcmp(name
, "context")) {
2302 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
,
2304 rc
= hp
->hook
.getprocattr(p
, "context", &cp
);
2311 rc
= append_ctx(&final
, &finallen
, hp
->lsmid
->lsm
,
2325 hlist_for_each_entry(hp
, &security_hook_heads
.getprocattr
, list
) {
2326 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsmid
->lsm
))
2328 if (lsm
== NULL
&& display
!= LSMBLOB_INVALID
&&
2329 display
!= hp
->lsmid
->slot
)
2331 return hp
->hook
.getprocattr(p
, name
, value
);
2333 return LSM_RET_DEFAULT(getprocattr
);
2337 * security_setprocattr - Set process attributes via /proc
2338 * @lsm: name of module involved, or NULL
2339 * @name: name of the attribute
2340 * @value: value to set the attribute to
2341 * @size: size of the value
2343 * Set the process attribute for the specified security module
2344 * to the specified value. Note that this can only be used to set
2345 * the process attributes for the current, or "self" process.
2346 * The /proc code has already done this check.
2348 * Returns 0 on success, an appropriate code otherwise.
2350 int security_setprocattr(const char *lsm
, const char *name
, void *value
,
2353 struct security_hook_list
*hp
;
2356 int *display
= current
->security
;
2360 if (!strcmp(name
, "display")) {
2362 * Change the "display" value only if all the security
2363 * modules that support setting a procattr allow it.
2364 * It is assumed that all such security modules will be
2370 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
,
2372 rc
= hp
->hook
.setprocattr(name
, value
, size
);
2373 if (rc
< 0 && rc
!= -EINVAL
)
2379 copy
= kmemdup_nul(value
, size
, GFP_KERNEL
);
2383 termed
= strsep(©
, " \n");
2385 for (slot
= 0; slot
< lsm_slot
; slot
++)
2386 if (!strcmp(termed
, lsm_slotlist
[slot
]->lsm
)) {
2387 *display
= lsm_slotlist
[slot
]->slot
;
2396 hlist_for_each_entry(hp
, &security_hook_heads
.setprocattr
, list
) {
2397 if (lsm
!= NULL
&& strcmp(lsm
, hp
->lsmid
->lsm
))
2399 if (lsm
== NULL
&& *display
!= LSMBLOB_INVALID
&&
2400 *display
!= hp
->lsmid
->slot
)
2402 return hp
->hook
.setprocattr(name
, value
, size
);
2404 return LSM_RET_DEFAULT(setprocattr
);
2407 int security_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
2409 return call_int_hook(netlink_send
, 0, sk
, skb
);
2412 int security_ismaclabel(const char *name
)
2414 return call_int_hook(ismaclabel
, 0, name
);
2416 EXPORT_SYMBOL(security_ismaclabel
);
2418 int security_secid_to_secctx(struct lsmblob
*blob
, struct lsmcontext
*cp
,
2421 struct security_hook_list
*hp
;
2423 memset(cp
, 0, sizeof(*cp
));
2426 * display either is the slot number use for formatting
2427 * or an instruction on which relative slot to use.
2429 if (display
== LSMBLOB_DISPLAY
)
2430 display
= lsm_task_display(current
);
2431 else if (display
== LSMBLOB_FIRST
)
2432 display
= LSMBLOB_INVALID
;
2433 else if (display
< 0) {
2435 "LSM: %s unknown display\n", __func__
);
2436 display
= LSMBLOB_INVALID
;
2437 } else if (display
>= lsm_slot
) {
2439 "LSM: %s invalid display\n", __func__
);
2440 display
= LSMBLOB_INVALID
;
2444 hlist_for_each_entry(hp
, &security_hook_heads
.secid_to_secctx
, list
) {
2445 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2447 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
) {
2448 cp
->slot
= hp
->lsmid
->slot
;
2449 return hp
->hook
.secid_to_secctx(
2450 blob
->secid
[hp
->lsmid
->slot
],
2451 &cp
->context
, &cp
->len
);
2455 return LSM_RET_DEFAULT(secid_to_secctx
);
2457 EXPORT_SYMBOL(security_secid_to_secctx
);
2459 int security_secctx_to_secid(const char *secdata
, u32 seclen
,
2460 struct lsmblob
*blob
)
2462 struct security_hook_list
*hp
;
2463 int display
= lsm_task_display(current
);
2465 lsmblob_init(blob
, 0);
2466 hlist_for_each_entry(hp
, &security_hook_heads
.secctx_to_secid
, list
) {
2467 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2469 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
)
2470 return hp
->hook
.secctx_to_secid(secdata
, seclen
,
2471 &blob
->secid
[hp
->lsmid
->slot
]);
2475 EXPORT_SYMBOL(security_secctx_to_secid
);
2477 void security_release_secctx(struct lsmcontext
*cp
)
2479 struct security_hook_list
*hp
;
2481 hlist_for_each_entry(hp
, &security_hook_heads
.release_secctx
, list
)
2482 if (cp
->slot
== hp
->lsmid
->slot
) {
2483 hp
->hook
.release_secctx(cp
->context
, cp
->len
);
2487 memset(cp
, 0, sizeof(*cp
));
2489 EXPORT_SYMBOL(security_release_secctx
);
2491 void security_inode_invalidate_secctx(struct inode
*inode
)
2493 call_void_hook(inode_invalidate_secctx
, inode
);
2495 EXPORT_SYMBOL(security_inode_invalidate_secctx
);
2497 int security_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
2499 return call_int_hook(inode_notifysecctx
, 0, inode
, ctx
, ctxlen
);
2501 EXPORT_SYMBOL(security_inode_notifysecctx
);
2503 int security_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
2505 return call_int_hook(inode_setsecctx
, 0, dentry
, ctx
, ctxlen
);
2507 EXPORT_SYMBOL(security_inode_setsecctx
);
2509 int security_inode_getsecctx(struct inode
*inode
, struct lsmcontext
*cp
)
2511 struct security_hook_list
*hp
;
2513 memset(cp
, 0, sizeof(*cp
));
2515 hlist_for_each_entry(hp
, &security_hook_heads
.inode_getsecctx
, list
) {
2516 cp
->slot
= hp
->lsmid
->slot
;
2517 return hp
->hook
.inode_getsecctx(inode
, (void **)&cp
->context
,
2522 EXPORT_SYMBOL(security_inode_getsecctx
);
2524 #ifdef CONFIG_WATCH_QUEUE
2525 int security_post_notification(const struct cred
*w_cred
,
2526 const struct cred
*cred
,
2527 struct watch_notification
*n
)
2529 return call_int_hook(post_notification
, 0, w_cred
, cred
, n
);
2531 #endif /* CONFIG_WATCH_QUEUE */
2533 #ifdef CONFIG_KEY_NOTIFICATIONS
2534 int security_watch_key(struct key
*key
)
2536 return call_int_hook(watch_key
, 0, key
);
2540 #ifdef CONFIG_SECURITY_NETWORK
2542 int security_unix_stream_connect(struct sock
*sock
, struct sock
*other
, struct sock
*newsk
)
2544 return call_int_hook(unix_stream_connect
, 0, sock
, other
, newsk
);
2546 EXPORT_SYMBOL(security_unix_stream_connect
);
2548 int security_unix_may_send(struct socket
*sock
, struct socket
*other
)
2550 return call_int_hook(unix_may_send
, 0, sock
, other
);
2552 EXPORT_SYMBOL(security_unix_may_send
);
2554 int security_socket_create(int family
, int type
, int protocol
, int kern
)
2556 return call_int_hook(socket_create
, 0, family
, type
, protocol
, kern
);
2559 int security_socket_post_create(struct socket
*sock
, int family
,
2560 int type
, int protocol
, int kern
)
2562 return call_int_hook(socket_post_create
, 0, sock
, family
, type
,
2566 int security_socket_socketpair(struct socket
*socka
, struct socket
*sockb
)
2568 return call_int_hook(socket_socketpair
, 0, socka
, sockb
);
2570 EXPORT_SYMBOL(security_socket_socketpair
);
2572 int security_socket_bind(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
2574 return call_int_hook(socket_bind
, 0, sock
, address
, addrlen
);
2577 int security_socket_connect(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
2579 return call_int_hook(socket_connect
, 0, sock
, address
, addrlen
);
2582 int security_socket_listen(struct socket
*sock
, int backlog
)
2584 return call_int_hook(socket_listen
, 0, sock
, backlog
);
2587 int security_socket_accept(struct socket
*sock
, struct socket
*newsock
)
2589 return call_int_hook(socket_accept
, 0, sock
, newsock
);
2592 int security_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
, int size
)
2594 return call_int_hook(socket_sendmsg
, 0, sock
, msg
, size
);
2597 int security_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
2598 int size
, int flags
)
2600 return call_int_hook(socket_recvmsg
, 0, sock
, msg
, size
, flags
);
2603 int security_socket_getsockname(struct socket
*sock
)
2605 return call_int_hook(socket_getsockname
, 0, sock
);
2608 int security_socket_getpeername(struct socket
*sock
)
2610 return call_int_hook(socket_getpeername
, 0, sock
);
2613 int security_socket_getsockopt(struct socket
*sock
, int level
, int optname
)
2615 return call_int_hook(socket_getsockopt
, 0, sock
, level
, optname
);
2618 int security_socket_setsockopt(struct socket
*sock
, int level
, int optname
)
2620 return call_int_hook(socket_setsockopt
, 0, sock
, level
, optname
);
2623 int security_socket_shutdown(struct socket
*sock
, int how
)
2625 return call_int_hook(socket_shutdown
, 0, sock
, how
);
2628 int security_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2630 return call_int_hook(socket_sock_rcv_skb
, 0, sk
, skb
);
2632 EXPORT_SYMBOL(security_sock_rcv_skb
);
2634 int security_socket_getpeersec_stream(struct socket
*sock
, char __user
*optval
,
2635 int __user
*optlen
, unsigned len
)
2637 int display
= lsm_task_display(current
);
2638 struct security_hook_list
*hp
;
2640 hlist_for_each_entry(hp
, &security_hook_heads
.socket_getpeersec_stream
,
2642 if (display
== LSMBLOB_INVALID
|| display
== hp
->lsmid
->slot
)
2643 return hp
->hook
.socket_getpeersec_stream(sock
, optval
,
2645 return -ENOPROTOOPT
;
2648 int security_socket_getpeersec_dgram(struct socket
*sock
, struct sk_buff
*skb
,
2649 struct lsmblob
*blob
)
2651 struct security_hook_list
*hp
;
2652 int rc
= -ENOPROTOOPT
;
2654 hlist_for_each_entry(hp
, &security_hook_heads
.socket_getpeersec_dgram
,
2656 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2658 rc
= hp
->hook
.socket_getpeersec_dgram(sock
, skb
,
2659 &blob
->secid
[hp
->lsmid
->slot
]);
2665 EXPORT_SYMBOL(security_socket_getpeersec_dgram
);
2667 int security_sk_alloc(struct sock
*sk
, int family
, gfp_t priority
)
2669 int rc
= lsm_sock_alloc(sk
, priority
);
2673 rc
= call_int_hook(sk_alloc_security
, 0, sk
, family
, priority
);
2675 security_sk_free(sk
);
2679 void security_sk_free(struct sock
*sk
)
2681 call_void_hook(sk_free_security
, sk
);
2682 kfree(sk
->sk_security
);
2683 sk
->sk_security
= NULL
;
2686 void security_sk_clone(const struct sock
*sk
, struct sock
*newsk
)
2688 call_void_hook(sk_clone_security
, sk
, newsk
);
2690 EXPORT_SYMBOL(security_sk_clone
);
2692 void security_sk_classify_flow(struct sock
*sk
, struct flowi_common
*flic
)
2694 call_void_hook(sk_getsecid
, sk
, &flic
->flowic_secid
);
2696 EXPORT_SYMBOL(security_sk_classify_flow
);
2698 void security_req_classify_flow(const struct request_sock
*req
,
2699 struct flowi_common
*flic
)
2701 call_void_hook(req_classify_flow
, req
, flic
);
2703 EXPORT_SYMBOL(security_req_classify_flow
);
2705 void security_sock_graft(struct sock
*sk
, struct socket
*parent
)
2707 call_void_hook(sock_graft
, sk
, parent
);
2709 EXPORT_SYMBOL(security_sock_graft
);
2711 int security_inet_conn_request(const struct sock
*sk
,
2712 struct sk_buff
*skb
, struct request_sock
*req
)
2714 return call_int_hook(inet_conn_request
, 0, sk
, skb
, req
);
2716 EXPORT_SYMBOL(security_inet_conn_request
);
2718 void security_inet_csk_clone(struct sock
*newsk
,
2719 const struct request_sock
*req
)
2721 call_void_hook(inet_csk_clone
, newsk
, req
);
2724 void security_inet_conn_established(struct sock
*sk
,
2725 struct sk_buff
*skb
)
2727 call_void_hook(inet_conn_established
, sk
, skb
);
2729 EXPORT_SYMBOL(security_inet_conn_established
);
2731 int security_secmark_relabel_packet(struct lsmblob
*blob
)
2733 struct security_hook_list
*hp
;
2736 hlist_for_each_entry(hp
, &security_hook_heads
.secmark_relabel_packet
,
2738 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2740 rc
= hp
->hook
.secmark_relabel_packet(
2741 blob
->secid
[hp
->lsmid
->slot
]);
2747 EXPORT_SYMBOL(security_secmark_relabel_packet
);
2749 void security_secmark_refcount_inc(void)
2751 call_void_hook(secmark_refcount_inc
);
2753 EXPORT_SYMBOL(security_secmark_refcount_inc
);
2755 void security_secmark_refcount_dec(void)
2757 call_void_hook(secmark_refcount_dec
);
2759 EXPORT_SYMBOL(security_secmark_refcount_dec
);
2761 int security_tun_dev_alloc_security(void **security
)
2763 return call_int_hook(tun_dev_alloc_security
, 0, security
);
2765 EXPORT_SYMBOL(security_tun_dev_alloc_security
);
2767 void security_tun_dev_free_security(void *security
)
2769 call_void_hook(tun_dev_free_security
, security
);
2771 EXPORT_SYMBOL(security_tun_dev_free_security
);
2773 int security_tun_dev_create(void)
2775 return call_int_hook(tun_dev_create
, 0);
2777 EXPORT_SYMBOL(security_tun_dev_create
);
2779 int security_tun_dev_attach_queue(void *security
)
2781 return call_int_hook(tun_dev_attach_queue
, 0, security
);
2783 EXPORT_SYMBOL(security_tun_dev_attach_queue
);
2785 int security_tun_dev_attach(struct sock
*sk
, void *security
)
2787 return call_int_hook(tun_dev_attach
, 0, sk
, security
);
2789 EXPORT_SYMBOL(security_tun_dev_attach
);
2791 int security_tun_dev_open(void *security
)
2793 return call_int_hook(tun_dev_open
, 0, security
);
2795 EXPORT_SYMBOL(security_tun_dev_open
);
2797 int security_sctp_assoc_request(struct sctp_endpoint
*ep
, struct sk_buff
*skb
)
2799 return call_int_hook(sctp_assoc_request
, 0, ep
, skb
);
2801 EXPORT_SYMBOL(security_sctp_assoc_request
);
2803 int security_sctp_bind_connect(struct sock
*sk
, int optname
,
2804 struct sockaddr
*address
, int addrlen
)
2806 return call_int_hook(sctp_bind_connect
, 0, sk
, optname
,
2809 EXPORT_SYMBOL(security_sctp_bind_connect
);
2811 void security_sctp_sk_clone(struct sctp_endpoint
*ep
, struct sock
*sk
,
2814 call_void_hook(sctp_sk_clone
, ep
, sk
, newsk
);
2816 EXPORT_SYMBOL(security_sctp_sk_clone
);
2818 #endif /* CONFIG_SECURITY_NETWORK */
2820 #ifdef CONFIG_SECURITY_INFINIBAND
2822 int security_ib_pkey_access(void *sec
, u64 subnet_prefix
, u16 pkey
)
2824 return call_int_hook(ib_pkey_access
, 0, sec
, subnet_prefix
, pkey
);
2826 EXPORT_SYMBOL(security_ib_pkey_access
);
2828 int security_ib_endport_manage_subnet(void *sec
, const char *dev_name
, u8 port_num
)
2830 return call_int_hook(ib_endport_manage_subnet
, 0, sec
, dev_name
, port_num
);
2832 EXPORT_SYMBOL(security_ib_endport_manage_subnet
);
2834 int security_ib_alloc_security(void **sec
)
2836 return call_int_hook(ib_alloc_security
, 0, sec
);
2838 EXPORT_SYMBOL(security_ib_alloc_security
);
2840 void security_ib_free_security(void *sec
)
2842 call_void_hook(ib_free_security
, sec
);
2844 EXPORT_SYMBOL(security_ib_free_security
);
2845 #endif /* CONFIG_SECURITY_INFINIBAND */
2847 #ifdef CONFIG_SECURITY_NETWORK_XFRM
2849 int security_xfrm_policy_alloc(struct xfrm_sec_ctx
**ctxp
,
2850 struct xfrm_user_sec_ctx
*sec_ctx
,
2853 return call_int_hook(xfrm_policy_alloc_security
, 0, ctxp
, sec_ctx
, gfp
);
2855 EXPORT_SYMBOL(security_xfrm_policy_alloc
);
2857 int security_xfrm_policy_clone(struct xfrm_sec_ctx
*old_ctx
,
2858 struct xfrm_sec_ctx
**new_ctxp
)
2860 return call_int_hook(xfrm_policy_clone_security
, 0, old_ctx
, new_ctxp
);
2863 void security_xfrm_policy_free(struct xfrm_sec_ctx
*ctx
)
2865 call_void_hook(xfrm_policy_free_security
, ctx
);
2867 EXPORT_SYMBOL(security_xfrm_policy_free
);
2869 int security_xfrm_policy_delete(struct xfrm_sec_ctx
*ctx
)
2871 return call_int_hook(xfrm_policy_delete_security
, 0, ctx
);
2874 int security_xfrm_state_alloc(struct xfrm_state
*x
,
2875 struct xfrm_user_sec_ctx
*sec_ctx
)
2877 return call_int_hook(xfrm_state_alloc
, 0, x
, sec_ctx
);
2879 EXPORT_SYMBOL(security_xfrm_state_alloc
);
2881 int security_xfrm_state_alloc_acquire(struct xfrm_state
*x
,
2882 struct xfrm_sec_ctx
*polsec
, u32 secid
)
2884 return call_int_hook(xfrm_state_alloc_acquire
, 0, x
, polsec
, secid
);
2887 int security_xfrm_state_delete(struct xfrm_state
*x
)
2889 return call_int_hook(xfrm_state_delete_security
, 0, x
);
2891 EXPORT_SYMBOL(security_xfrm_state_delete
);
2893 void security_xfrm_state_free(struct xfrm_state
*x
)
2895 call_void_hook(xfrm_state_free_security
, x
);
2898 int security_xfrm_policy_lookup(struct xfrm_sec_ctx
*ctx
, u32 fl_secid
)
2900 return call_int_hook(xfrm_policy_lookup
, 0, ctx
, fl_secid
);
2903 int security_xfrm_state_pol_flow_match(struct xfrm_state
*x
,
2904 struct xfrm_policy
*xp
,
2905 const struct flowi_common
*flic
)
2907 struct security_hook_list
*hp
;
2908 int rc
= LSM_RET_DEFAULT(xfrm_state_pol_flow_match
);
2911 * Since this function is expected to return 0 or 1, the judgment
2912 * becomes difficult if multiple LSMs supply this call. Fortunately,
2913 * we can use the first LSM's judgment because currently only SELinux
2914 * supplies this call.
2916 * For speed optimization, we explicitly break the loop rather than
2919 hlist_for_each_entry(hp
, &security_hook_heads
.xfrm_state_pol_flow_match
,
2921 rc
= hp
->hook
.xfrm_state_pol_flow_match(x
, xp
, flic
);
2927 int security_xfrm_decode_session(struct sk_buff
*skb
, u32
*secid
)
2929 return call_int_hook(xfrm_decode_session
, 0, skb
, secid
, 1);
2932 void security_skb_classify_flow(struct sk_buff
*skb
, struct flowi_common
*flic
)
2934 int rc
= call_int_hook(xfrm_decode_session
, 0, skb
, &flic
->flowic_secid
,
2939 EXPORT_SYMBOL(security_skb_classify_flow
);
2941 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
2945 int security_key_alloc(struct key
*key
, const struct cred
*cred
,
2946 unsigned long flags
)
2948 return call_int_hook(key_alloc
, 0, key
, cred
, flags
);
2951 void security_key_free(struct key
*key
)
2953 call_void_hook(key_free
, key
);
2956 int security_key_permission(key_ref_t key_ref
, const struct cred
*cred
,
2957 enum key_need_perm need_perm
)
2959 return call_int_hook(key_permission
, 0, key_ref
, cred
, need_perm
);
2962 int security_key_getsecurity(struct key
*key
, char **_buffer
)
2965 return call_int_hook(key_getsecurity
, 0, key
, _buffer
);
2968 #endif /* CONFIG_KEYS */
2972 int security_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **lsmrule
)
2974 struct security_hook_list
*hp
;
2975 int display
= lsm_task_display(current
);
2977 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_init
, list
) {
2978 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
2980 if (display
!= LSMBLOB_INVALID
&& display
!= hp
->lsmid
->slot
)
2982 return hp
->hook
.audit_rule_init(field
, op
, rulestr
,
2983 &lsmrule
[hp
->lsmid
->slot
]);
2988 int security_audit_rule_known(struct audit_krule
*krule
)
2990 return call_int_hook(audit_rule_known
, 0, krule
);
2993 void security_audit_rule_free(void **lsmrule
)
2995 struct security_hook_list
*hp
;
2997 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_free
, list
) {
2998 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
3000 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3002 hp
->hook
.audit_rule_free(lsmrule
[hp
->lsmid
->slot
]);
3006 int security_audit_rule_match(struct lsmblob
*blob
, u32 field
, u32 op
,
3009 struct security_hook_list
*hp
;
3012 hlist_for_each_entry(hp
, &security_hook_heads
.audit_rule_match
, list
) {
3013 if (WARN_ON(hp
->lsmid
->slot
< 0 || hp
->lsmid
->slot
>= lsm_slot
))
3015 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3017 if (lsmrule
[hp
->lsmid
->slot
] == NULL
)
3019 rc
= hp
->hook
.audit_rule_match(blob
->secid
[hp
->lsmid
->slot
],
3021 &lsmrule
[hp
->lsmid
->slot
]);
3027 #endif /* CONFIG_AUDIT */
3029 #ifdef CONFIG_BPF_SYSCALL
3030 int security_bpf(int cmd
, union bpf_attr
*attr
, unsigned int size
)
3032 return call_int_hook(bpf
, 0, cmd
, attr
, size
);
3034 int security_bpf_map(struct bpf_map
*map
, fmode_t fmode
)
3036 return call_int_hook(bpf_map
, 0, map
, fmode
);
3038 int security_bpf_prog(struct bpf_prog
*prog
)
3040 return call_int_hook(bpf_prog
, 0, prog
);
3042 int security_bpf_map_alloc(struct bpf_map
*map
)
3044 return call_int_hook(bpf_map_alloc_security
, 0, map
);
3046 int security_bpf_prog_alloc(struct bpf_prog_aux
*aux
)
3048 return call_int_hook(bpf_prog_alloc_security
, 0, aux
);
3050 void security_bpf_map_free(struct bpf_map
*map
)
3052 call_void_hook(bpf_map_free_security
, map
);
3054 void security_bpf_prog_free(struct bpf_prog_aux
*aux
)
3056 call_void_hook(bpf_prog_free_security
, aux
);
3058 #endif /* CONFIG_BPF_SYSCALL */
3060 int security_locked_down(enum lockdown_reason what
)
3062 return call_int_hook(locked_down
, 0, what
);
3064 EXPORT_SYMBOL(security_locked_down
);
3066 int security_lock_kernel_down(const char *where
, enum lockdown_reason level
)
3068 return call_int_hook(lock_kernel_down
, 0, where
, level
);
3070 EXPORT_SYMBOL(security_lock_kernel_down
);
3072 #ifdef CONFIG_PERF_EVENTS
3073 int security_perf_event_open(struct perf_event_attr
*attr
, int type
)
3075 return call_int_hook(perf_event_open
, 0, attr
, type
);
3078 int security_perf_event_alloc(struct perf_event
*event
)
3080 return call_int_hook(perf_event_alloc
, 0, event
);
3083 void security_perf_event_free(struct perf_event
*event
)
3085 call_void_hook(perf_event_free
, event
);
3088 int security_perf_event_read(struct perf_event
*event
)
3090 return call_int_hook(perf_event_read
, 0, event
);
3093 int security_perf_event_write(struct perf_event
*event
)
3095 return call_int_hook(perf_event_write
, 0, event
);
3097 #endif /* CONFIG_PERF_EVENTS */