2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
46 #define TRANS_TRUE "TRUE"
47 #define TRANS_TRUE_SIZE 4
49 #define SMK_CONNECTING 0
50 #define SMK_RECEIVING 1
53 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
54 LIST_HEAD(smk_ipv6_port_list
);
55 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
56 static struct kmem_cache
*smack_inode_cache
;
59 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
60 static char *smk_bu_mess
[] = {
61 "Bringup Error", /* Unused */
62 "Bringup", /* SMACK_BRINGUP_ALLOW */
63 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
64 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
67 static void smk_bu_mode(int mode
, char *s
)
77 if (mode
& MAY_APPEND
)
79 if (mode
& MAY_TRANSMUTE
)
89 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
90 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
91 struct smack_known
*oskp
, int mode
, int rc
)
93 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
97 if (rc
> SMACK_UNCONFINED_OBJECT
)
100 smk_bu_mode(mode
, acc
);
101 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
102 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
106 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
109 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
110 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
113 struct task_smack
*tsp
= current_security();
114 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
118 if (rc
> SMACK_UNCONFINED_OBJECT
)
121 smk_bu_mode(mode
, acc
);
122 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
123 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
124 acc
, current
->comm
, note
);
128 #define smk_bu_current(note, oskp, mode, RC) (RC)
131 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
132 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
134 struct task_smack
*tsp
= current_security();
135 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
136 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
140 if (rc
> SMACK_UNCONFINED_OBJECT
)
143 smk_bu_mode(mode
, acc
);
144 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
145 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
146 current
->comm
, otp
->comm
);
150 #define smk_bu_task(otp, mode, RC) (RC)
153 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
154 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
156 struct task_smack
*tsp
= current_security();
157 struct inode_smack
*isp
= inode
->i_security
;
158 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
160 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
161 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
162 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
166 if (rc
> SMACK_UNCONFINED_OBJECT
)
168 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
169 (mode
& (MAY_WRITE
| MAY_APPEND
)))
170 isp
->smk_flags
|= SMK_INODE_IMPURE
;
172 smk_bu_mode(mode
, acc
);
174 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
175 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
176 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
180 #define smk_bu_inode(inode, mode, RC) (RC)
183 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
184 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
186 struct task_smack
*tsp
= current_security();
187 struct smack_known
*sskp
= tsp
->smk_task
;
188 struct inode
*inode
= file_inode(file
);
189 struct inode_smack
*isp
= inode
->i_security
;
190 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
192 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
193 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
194 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
198 if (rc
> SMACK_UNCONFINED_OBJECT
)
201 smk_bu_mode(mode
, acc
);
202 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
203 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
204 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
209 #define smk_bu_file(file, mode, RC) (RC)
212 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
213 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
216 struct task_smack
*tsp
= cred
->security
;
217 struct smack_known
*sskp
= tsp
->smk_task
;
218 struct inode
*inode
= file
->f_inode
;
219 struct inode_smack
*isp
= inode
->i_security
;
220 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
222 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
223 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
224 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
228 if (rc
> SMACK_UNCONFINED_OBJECT
)
231 smk_bu_mode(mode
, acc
);
232 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
233 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
234 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
239 #define smk_bu_credfile(cred, file, mode, RC) (RC)
243 * smk_fetch - Fetch the smack label from a file.
244 * @name: type of the label (attribute)
245 * @ip: a pointer to the inode
246 * @dp: a pointer to the dentry
248 * Returns a pointer to the master list entry for the Smack label
249 * or NULL if there was no label to fetch.
251 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
256 struct smack_known
*skp
= NULL
;
258 if (ip
->i_op
->getxattr
== NULL
)
261 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
265 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
267 skp
= smk_import_entry(buffer
, rc
);
275 * new_inode_smack - allocate an inode security blob
276 * @skp: a pointer to the Smack label entry to use in the blob
278 * Returns the new blob or NULL if there's no memory available
280 struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
282 struct inode_smack
*isp
;
284 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
288 isp
->smk_inode
= skp
;
290 mutex_init(&isp
->smk_lock
);
296 * new_task_smack - allocate a task security blob
297 * @task: a pointer to the Smack label for the running task
298 * @forked: a pointer to the Smack label for the forked task
299 * @gfp: type of the memory for the allocation
301 * Returns the new blob or NULL if there's no memory available
303 static struct task_smack
*new_task_smack(struct smack_known
*task
,
304 struct smack_known
*forked
, gfp_t gfp
)
306 struct task_smack
*tsp
;
308 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
312 tsp
->smk_task
= task
;
313 tsp
->smk_forked
= forked
;
314 INIT_LIST_HEAD(&tsp
->smk_rules
);
315 mutex_init(&tsp
->smk_rules_lock
);
321 * smk_copy_rules - copy a rule set
322 * @nhead: new rules header pointer
323 * @ohead: old rules header pointer
324 * @gfp: type of the memory for the allocation
326 * Returns 0 on success, -ENOMEM on error
328 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
331 struct smack_rule
*nrp
;
332 struct smack_rule
*orp
;
335 INIT_LIST_HEAD(nhead
);
337 list_for_each_entry_rcu(orp
, ohead
, list
) {
338 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
344 list_add_rcu(&nrp
->list
, nhead
);
350 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
351 * @mode - input mode in form of PTRACE_MODE_*
353 * Returns a converted MAY_* mode usable by smack rules
355 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
358 case PTRACE_MODE_READ
:
360 case PTRACE_MODE_ATTACH
:
361 return MAY_READWRITE
;
368 * smk_ptrace_rule_check - helper for ptrace access
369 * @tracer: tracer process
370 * @tracee_known: label entry of the process that's about to be traced
371 * @mode: ptrace attachment mode (PTRACE_MODE_*)
372 * @func: name of the function that called us, used for audit
374 * Returns 0 on access granted, -error on error
376 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
377 struct smack_known
*tracee_known
,
378 unsigned int mode
, const char *func
)
381 struct smk_audit_info ad
, *saip
= NULL
;
382 struct task_smack
*tsp
;
383 struct smack_known
*tracer_known
;
385 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
386 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
387 smk_ad_setfield_u_tsk(&ad
, tracer
);
392 tsp
= __task_cred(tracer
)->security
;
393 tracer_known
= smk_of_task(tsp
);
395 if ((mode
& PTRACE_MODE_ATTACH
) &&
396 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
397 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
398 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
400 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
402 else if (capable(CAP_SYS_PTRACE
))
408 smack_log(tracer_known
->smk_known
,
409 tracee_known
->smk_known
,
416 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
417 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
425 * We he, that is fun!
429 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
430 * @ctp: child task pointer
431 * @mode: ptrace attachment mode (PTRACE_MODE_*)
433 * Returns 0 if access is OK, an error code otherwise
435 * Do the capability checks.
437 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
439 struct smack_known
*skp
;
441 skp
= smk_of_task_struct(ctp
);
443 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
447 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
448 * @ptp: parent task pointer
450 * Returns 0 if access is OK, an error code otherwise
452 * Do the capability checks, and require PTRACE_MODE_ATTACH.
454 static int smack_ptrace_traceme(struct task_struct
*ptp
)
457 struct smack_known
*skp
;
459 skp
= smk_of_task(current_security());
461 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
466 * smack_syslog - Smack approval on syslog
467 * @type: message type
469 * Returns 0 on success, error code otherwise.
471 static int smack_syslog(int typefrom_file
)
474 struct smack_known
*skp
= smk_of_current();
476 if (smack_privileged(CAP_MAC_OVERRIDE
))
479 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
491 * smack_sb_alloc_security - allocate a superblock blob
492 * @sb: the superblock getting the blob
494 * Returns 0 on success or -ENOMEM on error.
496 static int smack_sb_alloc_security(struct super_block
*sb
)
498 struct superblock_smack
*sbsp
;
500 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
505 sbsp
->smk_root
= &smack_known_floor
;
506 sbsp
->smk_default
= &smack_known_floor
;
507 sbsp
->smk_floor
= &smack_known_floor
;
508 sbsp
->smk_hat
= &smack_known_hat
;
510 * smk_initialized will be zero from kzalloc.
512 sb
->s_security
= sbsp
;
518 * smack_sb_free_security - free a superblock blob
519 * @sb: the superblock getting the blob
522 static void smack_sb_free_security(struct super_block
*sb
)
524 kfree(sb
->s_security
);
525 sb
->s_security
= NULL
;
529 * smack_sb_copy_data - copy mount options data for processing
530 * @orig: where to start
531 * @smackopts: mount options string
533 * Returns 0 on success or -ENOMEM on error.
535 * Copy the Smack specific mount options out of the mount
538 static int smack_sb_copy_data(char *orig
, char *smackopts
)
540 char *cp
, *commap
, *otheropts
, *dp
;
542 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
543 if (otheropts
== NULL
)
546 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
547 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
549 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
551 else if (strstr(cp
, SMK_FSHAT
) == cp
)
553 else if (strstr(cp
, SMK_FSROOT
) == cp
)
555 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
560 commap
= strchr(cp
, ',');
569 strcpy(orig
, otheropts
);
570 free_page((unsigned long)otheropts
);
576 * smack_sb_kern_mount - Smack specific mount processing
577 * @sb: the file system superblock
578 * @flags: the mount flags
579 * @data: the smack mount options
581 * Returns 0 on success, an error code on failure
583 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
585 struct dentry
*root
= sb
->s_root
;
586 struct inode
*inode
= d_backing_inode(root
);
587 struct superblock_smack
*sp
= sb
->s_security
;
588 struct inode_smack
*isp
;
589 struct smack_known
*skp
;
595 if (sp
->smk_initialized
)
598 sp
->smk_initialized
= 1;
600 for (op
= data
; op
!= NULL
; op
= commap
) {
601 commap
= strchr(op
, ',');
605 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
606 op
+= strlen(SMK_FSHAT
);
607 skp
= smk_import_entry(op
, 0);
612 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
613 op
+= strlen(SMK_FSFLOOR
);
614 skp
= smk_import_entry(op
, 0);
619 } else if (strncmp(op
, SMK_FSDEFAULT
,
620 strlen(SMK_FSDEFAULT
)) == 0) {
621 op
+= strlen(SMK_FSDEFAULT
);
622 skp
= smk_import_entry(op
, 0);
624 sp
->smk_default
= skp
;
627 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
628 op
+= strlen(SMK_FSROOT
);
629 skp
= smk_import_entry(op
, 0);
634 } else if (strncmp(op
, SMK_FSTRANS
, strlen(SMK_FSTRANS
)) == 0) {
635 op
+= strlen(SMK_FSTRANS
);
636 skp
= smk_import_entry(op
, 0);
645 if (!smack_privileged(CAP_MAC_ADMIN
)) {
647 * Unprivileged mounts don't get to specify Smack values.
652 * Unprivileged mounts get root and default from the caller.
654 skp
= smk_of_current();
656 sp
->smk_default
= skp
;
659 * Initialize the root inode.
661 isp
= inode
->i_security
;
663 isp
= new_inode_smack(sp
->smk_root
);
666 inode
->i_security
= isp
;
668 isp
->smk_inode
= sp
->smk_root
;
671 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
677 * smack_sb_statfs - Smack check on statfs
678 * @dentry: identifies the file system in question
680 * Returns 0 if current can read the floor of the filesystem,
681 * and error code otherwise
683 static int smack_sb_statfs(struct dentry
*dentry
)
685 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
687 struct smk_audit_info ad
;
689 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
690 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
692 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
693 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
702 * smack_bprm_set_creds - set creds for exec
703 * @bprm: the exec information
705 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
707 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
709 struct inode
*inode
= file_inode(bprm
->file
);
710 struct task_smack
*bsp
= bprm
->cred
->security
;
711 struct inode_smack
*isp
;
714 if (bprm
->cred_prepared
)
717 isp
= inode
->i_security
;
718 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
721 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
722 struct task_struct
*tracer
;
726 tracer
= ptrace_parent(current
);
727 if (likely(tracer
!= NULL
))
728 rc
= smk_ptrace_rule_check(tracer
,
736 } else if (bprm
->unsafe
)
739 bsp
->smk_task
= isp
->smk_task
;
740 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
746 * smack_bprm_committing_creds - Prepare to install the new credentials
749 * @bprm: binprm for exec
751 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
753 struct task_smack
*bsp
= bprm
->cred
->security
;
755 if (bsp
->smk_task
!= bsp
->smk_forked
)
756 current
->pdeath_signal
= 0;
760 * smack_bprm_secureexec - Return the decision to use secureexec.
761 * @bprm: binprm for exec
763 * Returns 0 on success.
765 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
767 struct task_smack
*tsp
= current_security();
769 if (tsp
->smk_task
!= tsp
->smk_forked
)
780 * smack_inode_alloc_security - allocate an inode blob
781 * @inode: the inode in need of a blob
783 * Returns 0 if it gets a blob, -ENOMEM otherwise
785 static int smack_inode_alloc_security(struct inode
*inode
)
787 struct smack_known
*skp
= smk_of_current();
789 inode
->i_security
= new_inode_smack(skp
);
790 if (inode
->i_security
== NULL
)
796 * smack_inode_free_security - free an inode blob
797 * @inode: the inode with a blob
799 * Clears the blob pointer in inode
801 static void smack_inode_free_security(struct inode
*inode
)
803 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
804 inode
->i_security
= NULL
;
808 * smack_inode_init_security - copy out the smack from an inode
809 * @inode: the newly created inode
810 * @dir: containing directory object
812 * @name: where to put the attribute name
813 * @value: where to put the attribute value
814 * @len: where to put the length of the attribute
816 * Returns 0 if it all works out, -ENOMEM if there's no memory
818 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
819 const struct qstr
*qstr
, const char **name
,
820 void **value
, size_t *len
)
822 struct inode_smack
*issp
= inode
->i_security
;
823 struct smack_known
*skp
= smk_of_current();
824 struct smack_known
*isp
= smk_of_inode(inode
);
825 struct smack_known
*dsp
= smk_of_inode(dir
);
829 *name
= XATTR_SMACK_SUFFIX
;
833 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
838 * If the access rule allows transmutation and
839 * the directory requests transmutation then
840 * by all means transmute.
841 * Mark the inode as changed.
843 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
844 smk_inode_transmutable(dir
)) {
846 issp
->smk_flags
|= SMK_INODE_CHANGED
;
849 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
853 *len
= strlen(isp
->smk_known
);
860 * smack_inode_link - Smack check on link
861 * @old_dentry: the existing object
863 * @new_dentry: the new object
865 * Returns 0 if access is permitted, an error code otherwise
867 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
868 struct dentry
*new_dentry
)
870 struct smack_known
*isp
;
871 struct smk_audit_info ad
;
874 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
875 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
877 isp
= smk_of_inode(d_backing_inode(old_dentry
));
878 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
879 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
881 if (rc
== 0 && d_is_positive(new_dentry
)) {
882 isp
= smk_of_inode(d_backing_inode(new_dentry
));
883 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
884 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
885 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
892 * smack_inode_unlink - Smack check on inode deletion
893 * @dir: containing directory object
894 * @dentry: file to unlink
896 * Returns 0 if current can write the containing directory
897 * and the object, error code otherwise
899 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
901 struct inode
*ip
= d_backing_inode(dentry
);
902 struct smk_audit_info ad
;
905 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
906 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
909 * You need write access to the thing you're unlinking
911 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
912 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
915 * You also need write access to the containing directory
917 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
918 smk_ad_setfield_u_fs_inode(&ad
, dir
);
919 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
920 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
926 * smack_inode_rmdir - Smack check on directory deletion
927 * @dir: containing directory object
928 * @dentry: directory to unlink
930 * Returns 0 if current can write the containing directory
931 * and the directory, error code otherwise
933 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
935 struct smk_audit_info ad
;
938 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
939 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
942 * You need write access to the thing you're removing
944 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
945 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
948 * You also need write access to the containing directory
950 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
951 smk_ad_setfield_u_fs_inode(&ad
, dir
);
952 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
953 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
960 * smack_inode_rename - Smack check on rename
962 * @old_dentry: the old object
964 * @new_dentry: the new object
966 * Read and write access is required on both the old and
969 * Returns 0 if access is permitted, an error code otherwise
971 static int smack_inode_rename(struct inode
*old_inode
,
972 struct dentry
*old_dentry
,
973 struct inode
*new_inode
,
974 struct dentry
*new_dentry
)
977 struct smack_known
*isp
;
978 struct smk_audit_info ad
;
980 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
981 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
983 isp
= smk_of_inode(d_backing_inode(old_dentry
));
984 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
985 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
987 if (rc
== 0 && d_is_positive(new_dentry
)) {
988 isp
= smk_of_inode(d_backing_inode(new_dentry
));
989 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
990 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
991 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
997 * smack_inode_permission - Smack version of permission()
998 * @inode: the inode in question
999 * @mask: the access requested
1001 * This is the important Smack hook.
1003 * Returns 0 if access is permitted, -EACCES otherwise
1005 static int smack_inode_permission(struct inode
*inode
, int mask
)
1007 struct smk_audit_info ad
;
1008 int no_block
= mask
& MAY_NOT_BLOCK
;
1011 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1013 * No permission to check. Existence test. Yup, it's there.
1018 /* May be droppable after audit */
1021 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1022 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1023 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1024 rc
= smk_bu_inode(inode
, mask
, rc
);
1029 * smack_inode_setattr - Smack check for setting attributes
1030 * @dentry: the object
1031 * @iattr: for the force flag
1033 * Returns 0 if access is permitted, an error code otherwise
1035 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1037 struct smk_audit_info ad
;
1041 * Need to allow for clearing the setuid bit.
1043 if (iattr
->ia_valid
& ATTR_FORCE
)
1045 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1046 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1048 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1049 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1054 * smack_inode_getattr - Smack check for getting attributes
1055 * @mnt: vfsmount of the object
1056 * @dentry: the object
1058 * Returns 0 if access is permitted, an error code otherwise
1060 static int smack_inode_getattr(const struct path
*path
)
1062 struct smk_audit_info ad
;
1063 struct inode
*inode
= d_backing_inode(path
->dentry
);
1066 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1067 smk_ad_setfield_u_fs_path(&ad
, *path
);
1068 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1069 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1074 * smack_inode_setxattr - Smack check for setting xattrs
1075 * @dentry: the object
1076 * @name: name of the attribute
1077 * @value: value of the attribute
1078 * @size: size of the value
1081 * This protects the Smack attribute explicitly.
1083 * Returns 0 if access is permitted, an error code otherwise
1085 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1086 const void *value
, size_t size
, int flags
)
1088 struct smk_audit_info ad
;
1089 struct smack_known
*skp
;
1091 int check_import
= 0;
1096 * Check label validity here so import won't fail in post_setxattr
1098 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1099 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1100 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1103 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1104 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1108 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1110 if (size
!= TRANS_TRUE_SIZE
||
1111 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1114 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1116 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1119 if (rc
== 0 && check_import
) {
1120 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1121 if (skp
== NULL
|| (check_star
&&
1122 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1126 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1127 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1130 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1131 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1138 * smack_inode_post_setxattr - Apply the Smack update approved above
1140 * @name: attribute name
1141 * @value: attribute value
1142 * @size: attribute size
1145 * Set the pointer in the inode blob to the entry found
1146 * in the master label list.
1148 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1149 const void *value
, size_t size
, int flags
)
1151 struct smack_known
*skp
;
1152 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1154 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1155 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1159 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1160 skp
= smk_import_entry(value
, size
);
1162 isp
->smk_inode
= skp
;
1164 isp
->smk_inode
= &smack_known_invalid
;
1165 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1166 skp
= smk_import_entry(value
, size
);
1168 isp
->smk_task
= skp
;
1170 isp
->smk_task
= &smack_known_invalid
;
1171 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1172 skp
= smk_import_entry(value
, size
);
1174 isp
->smk_mmap
= skp
;
1176 isp
->smk_mmap
= &smack_known_invalid
;
1183 * smack_inode_getxattr - Smack check on getxattr
1184 * @dentry: the object
1187 * Returns 0 if access is permitted, an error code otherwise
1189 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1191 struct smk_audit_info ad
;
1194 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1195 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1197 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1198 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1203 * smack_inode_removexattr - Smack check on removexattr
1204 * @dentry: the object
1205 * @name: name of the attribute
1207 * Removing the Smack attribute requires CAP_MAC_ADMIN
1209 * Returns 0 if access is permitted, an error code otherwise
1211 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1213 struct inode_smack
*isp
;
1214 struct smk_audit_info ad
;
1217 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1218 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1219 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1220 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1221 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1222 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1223 if (!smack_privileged(CAP_MAC_ADMIN
))
1226 rc
= cap_inode_removexattr(dentry
, name
);
1231 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1232 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1234 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1235 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1239 isp
= d_backing_inode(dentry
)->i_security
;
1241 * Don't do anything special for these.
1242 * XATTR_NAME_SMACKIPIN
1243 * XATTR_NAME_SMACKIPOUT
1244 * XATTR_NAME_SMACKEXEC
1246 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1247 isp
->smk_task
= NULL
;
1248 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1249 isp
->smk_mmap
= NULL
;
1250 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1251 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1257 * smack_inode_getsecurity - get smack xattrs
1258 * @inode: the object
1259 * @name: attribute name
1260 * @buffer: where to put the result
1263 * Returns the size of the attribute or an error code
1265 static int smack_inode_getsecurity(const struct inode
*inode
,
1266 const char *name
, void **buffer
,
1269 struct socket_smack
*ssp
;
1270 struct socket
*sock
;
1271 struct super_block
*sbp
;
1272 struct inode
*ip
= (struct inode
*)inode
;
1273 struct smack_known
*isp
;
1277 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1278 isp
= smk_of_inode(inode
);
1279 ilen
= strlen(isp
->smk_known
);
1280 *buffer
= isp
->smk_known
;
1285 * The rest of the Smack xattrs are only on sockets.
1288 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1291 sock
= SOCKET_I(ip
);
1292 if (sock
== NULL
|| sock
->sk
== NULL
)
1295 ssp
= sock
->sk
->sk_security
;
1297 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1299 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1304 ilen
= strlen(isp
->smk_known
);
1306 *buffer
= isp
->smk_known
;
1315 * smack_inode_listsecurity - list the Smack attributes
1316 * @inode: the object
1317 * @buffer: where they go
1318 * @buffer_size: size of buffer
1320 * Returns 0 on success, -EINVAL otherwise
1322 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1325 int len
= sizeof(XATTR_NAME_SMACK
);
1327 if (buffer
!= NULL
&& len
<= buffer_size
)
1328 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1334 * smack_inode_getsecid - Extract inode's security id
1335 * @inode: inode to extract the info from
1336 * @secid: where result will be saved
1338 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1340 struct inode_smack
*isp
= inode
->i_security
;
1342 *secid
= isp
->smk_inode
->smk_secid
;
1350 * smack_file_permission - Smack check on file operations
1356 * Should access checks be done on each read or write?
1357 * UNICOS and SELinux say yes.
1358 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1360 * I'll say no for now. Smack does not do the frequent
1361 * label changing that SELinux does.
1363 static int smack_file_permission(struct file
*file
, int mask
)
1369 * smack_file_alloc_security - assign a file security blob
1372 * The security blob for a file is a pointer to the master
1373 * label list, so no allocation is done.
1375 * f_security is the owner security information. It
1376 * isn't used on file access checks, it's for send_sigio.
1380 static int smack_file_alloc_security(struct file
*file
)
1382 struct smack_known
*skp
= smk_of_current();
1384 file
->f_security
= skp
;
1389 * smack_file_free_security - clear a file security blob
1392 * The security blob for a file is a pointer to the master
1393 * label list, so no memory is freed.
1395 static void smack_file_free_security(struct file
*file
)
1397 file
->f_security
= NULL
;
1401 * smack_file_ioctl - Smack check on ioctls
1406 * Relies heavily on the correct use of the ioctl command conventions.
1408 * Returns 0 if allowed, error code otherwise
1410 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1414 struct smk_audit_info ad
;
1415 struct inode
*inode
= file_inode(file
);
1417 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1418 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1420 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1421 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1422 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1425 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1426 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1427 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1434 * smack_file_lock - Smack check on file locking
1438 * Returns 0 if current has lock access, error code otherwise
1440 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1442 struct smk_audit_info ad
;
1444 struct inode
*inode
= file_inode(file
);
1446 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1447 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1448 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1449 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1454 * smack_file_fcntl - Smack check on fcntl
1456 * @cmd: what action to check
1459 * Generally these operations are harmless.
1460 * File locking operations present an obvious mechanism
1461 * for passing information, so they require write access.
1463 * Returns 0 if current has access, error code otherwise
1465 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1468 struct smk_audit_info ad
;
1470 struct inode
*inode
= file_inode(file
);
1477 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1478 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1479 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1480 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1484 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1485 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1486 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1487 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1498 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1499 * if mapping anonymous memory.
1500 * @file contains the file structure for file to map (may be NULL).
1501 * @reqprot contains the protection requested by the application.
1502 * @prot contains the protection that will be applied by the kernel.
1503 * @flags contains the operational flags.
1504 * Return 0 if permission is granted.
1506 static int smack_mmap_file(struct file
*file
,
1507 unsigned long reqprot
, unsigned long prot
,
1508 unsigned long flags
)
1510 struct smack_known
*skp
;
1511 struct smack_known
*mkp
;
1512 struct smack_rule
*srp
;
1513 struct task_smack
*tsp
;
1514 struct smack_known
*okp
;
1515 struct inode_smack
*isp
;
1524 isp
= file_inode(file
)->i_security
;
1525 if (isp
->smk_mmap
== NULL
)
1527 mkp
= isp
->smk_mmap
;
1529 tsp
= current_security();
1530 skp
= smk_of_current();
1535 * For each Smack rule associated with the subject
1536 * label verify that the SMACK64MMAP also has access
1537 * to that rule's object label.
1539 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1540 okp
= srp
->smk_object
;
1542 * Matching labels always allows access.
1544 if (mkp
->smk_known
== okp
->smk_known
)
1547 * If there is a matching local rule take
1548 * that into account as well.
1550 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1554 may
= srp
->smk_access
;
1556 may
&= srp
->smk_access
;
1558 * If may is zero the SMACK64MMAP subject can't
1559 * possibly have less access.
1565 * Fetch the global list entry.
1566 * If there isn't one a SMACK64MMAP subject
1567 * can't have as much access as current.
1569 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1571 if (mmay
== -ENOENT
) {
1576 * If there is a local entry it modifies the
1577 * potential access, too.
1579 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1581 if (tmay
!= -ENOENT
)
1585 * If there is any access available to current that is
1586 * not available to a SMACK64MMAP subject
1589 if ((may
| mmay
) != mmay
) {
1601 * smack_file_set_fowner - set the file security blob value
1602 * @file: object in question
1605 static void smack_file_set_fowner(struct file
*file
)
1607 file
->f_security
= smk_of_current();
1611 * smack_file_send_sigiotask - Smack on sigio
1612 * @tsk: The target task
1613 * @fown: the object the signal come from
1616 * Allow a privileged task to get signals even if it shouldn't
1618 * Returns 0 if a subject with the object's smack could
1619 * write to the task, an error code otherwise.
1621 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1622 struct fown_struct
*fown
, int signum
)
1624 struct smack_known
*skp
;
1625 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1628 struct smk_audit_info ad
;
1631 * struct fown_struct is never outside the context of a struct file
1633 file
= container_of(fown
, struct file
, f_owner
);
1635 /* we don't log here as rc can be overriden */
1636 skp
= file
->f_security
;
1637 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1638 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1639 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1642 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1643 smk_ad_setfield_u_tsk(&ad
, tsk
);
1644 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1649 * smack_file_receive - Smack file receive check
1652 * Returns 0 if current has access, error code otherwise
1654 static int smack_file_receive(struct file
*file
)
1658 struct smk_audit_info ad
;
1659 struct inode
*inode
= file_inode(file
);
1661 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1662 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1664 * This code relies on bitmasks.
1666 if (file
->f_mode
& FMODE_READ
)
1668 if (file
->f_mode
& FMODE_WRITE
)
1671 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1672 rc
= smk_bu_file(file
, may
, rc
);
1677 * smack_file_open - Smack dentry open processing
1679 * @cred: task credential
1681 * Set the security blob in the file structure.
1682 * Allow the open only if the task has read access. There are
1683 * many read operations (e.g. fstat) that you can do with an
1684 * fd even if you have the file open write-only.
1688 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1690 struct task_smack
*tsp
= cred
->security
;
1691 struct inode
*inode
= file_inode(file
);
1692 struct smk_audit_info ad
;
1695 if (smack_privileged(CAP_MAC_OVERRIDE
))
1698 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1699 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1700 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1701 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1711 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1712 * @new: the new credentials
1713 * @gfp: the atomicity of any memory allocations
1715 * Prepare a blank set of credentials for modification. This must allocate all
1716 * the memory the LSM module might require such that cred_transfer() can
1717 * complete without error.
1719 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1721 struct task_smack
*tsp
;
1723 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1727 cred
->security
= tsp
;
1734 * smack_cred_free - "free" task-level security credentials
1735 * @cred: the credentials in question
1738 static void smack_cred_free(struct cred
*cred
)
1740 struct task_smack
*tsp
= cred
->security
;
1741 struct smack_rule
*rp
;
1742 struct list_head
*l
;
1743 struct list_head
*n
;
1747 cred
->security
= NULL
;
1749 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1750 rp
= list_entry(l
, struct smack_rule
, list
);
1751 list_del(&rp
->list
);
1758 * smack_cred_prepare - prepare new set of credentials for modification
1759 * @new: the new credentials
1760 * @old: the original credentials
1761 * @gfp: the atomicity of any memory allocations
1763 * Prepare a new set of credentials for modification.
1765 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1768 struct task_smack
*old_tsp
= old
->security
;
1769 struct task_smack
*new_tsp
;
1772 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1773 if (new_tsp
== NULL
)
1776 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1780 new->security
= new_tsp
;
1785 * smack_cred_transfer - Transfer the old credentials to the new credentials
1786 * @new: the new credentials
1787 * @old: the original credentials
1789 * Fill in a set of blank credentials from another set of credentials.
1791 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1793 struct task_smack
*old_tsp
= old
->security
;
1794 struct task_smack
*new_tsp
= new->security
;
1796 new_tsp
->smk_task
= old_tsp
->smk_task
;
1797 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1798 mutex_init(&new_tsp
->smk_rules_lock
);
1799 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1802 /* cbs copy rule list */
1806 * smack_kernel_act_as - Set the subjective context in a set of credentials
1807 * @new: points to the set of credentials to be modified.
1808 * @secid: specifies the security ID to be set
1810 * Set the security data for a kernel service.
1812 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1814 struct task_smack
*new_tsp
= new->security
;
1815 struct smack_known
*skp
= smack_from_secid(secid
);
1820 new_tsp
->smk_task
= skp
;
1825 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1826 * @new: points to the set of credentials to be modified
1827 * @inode: points to the inode to use as a reference
1829 * Set the file creation context in a set of credentials to the same
1830 * as the objective context of the specified inode
1832 static int smack_kernel_create_files_as(struct cred
*new,
1833 struct inode
*inode
)
1835 struct inode_smack
*isp
= inode
->i_security
;
1836 struct task_smack
*tsp
= new->security
;
1838 tsp
->smk_forked
= isp
->smk_inode
;
1839 tsp
->smk_task
= tsp
->smk_forked
;
1844 * smk_curacc_on_task - helper to log task related access
1845 * @p: the task object
1846 * @access: the access requested
1847 * @caller: name of the calling function for audit
1849 * Return 0 if access is permitted
1851 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
1854 struct smk_audit_info ad
;
1855 struct smack_known
*skp
= smk_of_task_struct(p
);
1858 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
1859 smk_ad_setfield_u_tsk(&ad
, p
);
1860 rc
= smk_curacc(skp
, access
, &ad
);
1861 rc
= smk_bu_task(p
, access
, rc
);
1866 * smack_task_setpgid - Smack check on setting pgid
1867 * @p: the task object
1870 * Return 0 if write access is permitted
1872 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1874 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1878 * smack_task_getpgid - Smack access check for getpgid
1879 * @p: the object task
1881 * Returns 0 if current can read the object task, error code otherwise
1883 static int smack_task_getpgid(struct task_struct
*p
)
1885 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1889 * smack_task_getsid - Smack access check for getsid
1890 * @p: the object task
1892 * Returns 0 if current can read the object task, error code otherwise
1894 static int smack_task_getsid(struct task_struct
*p
)
1896 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1900 * smack_task_getsecid - get the secid of the task
1901 * @p: the object task
1902 * @secid: where to put the result
1904 * Sets the secid to contain a u32 version of the smack label.
1906 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1908 struct smack_known
*skp
= smk_of_task_struct(p
);
1910 *secid
= skp
->smk_secid
;
1914 * smack_task_setnice - Smack check on setting nice
1915 * @p: the task object
1918 * Return 0 if write access is permitted
1920 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1922 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1926 * smack_task_setioprio - Smack check on setting ioprio
1927 * @p: the task object
1930 * Return 0 if write access is permitted
1932 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1934 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1938 * smack_task_getioprio - Smack check on reading ioprio
1939 * @p: the task object
1941 * Return 0 if read access is permitted
1943 static int smack_task_getioprio(struct task_struct
*p
)
1945 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1949 * smack_task_setscheduler - Smack check on setting scheduler
1950 * @p: the task object
1954 * Return 0 if read access is permitted
1956 static int smack_task_setscheduler(struct task_struct
*p
)
1958 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1962 * smack_task_getscheduler - Smack check on reading scheduler
1963 * @p: the task object
1965 * Return 0 if read access is permitted
1967 static int smack_task_getscheduler(struct task_struct
*p
)
1969 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1973 * smack_task_movememory - Smack check on moving memory
1974 * @p: the task object
1976 * Return 0 if write access is permitted
1978 static int smack_task_movememory(struct task_struct
*p
)
1980 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1984 * smack_task_kill - Smack check on signal delivery
1985 * @p: the task object
1988 * @secid: identifies the smack to use in lieu of current's
1990 * Return 0 if write access is permitted
1992 * The secid behavior is an artifact of an SELinux hack
1993 * in the USB code. Someday it may go away.
1995 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1998 struct smk_audit_info ad
;
1999 struct smack_known
*skp
;
2000 struct smack_known
*tkp
= smk_of_task_struct(p
);
2003 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2004 smk_ad_setfield_u_tsk(&ad
, p
);
2006 * Sending a signal requires that the sender
2007 * can write the receiver.
2010 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
2011 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2015 * If the secid isn't 0 we're dealing with some USB IO
2016 * specific behavior. This is not clean. For one thing
2017 * we can't take privilege into account.
2019 skp
= smack_from_secid(secid
);
2020 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2021 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2026 * smack_task_wait - Smack access check for waiting
2027 * @p: task to wait for
2031 static int smack_task_wait(struct task_struct
*p
)
2034 * Allow the operation to succeed.
2036 * In userless environments (e.g. phones) programs
2037 * get marked with SMACK64EXEC and even if the parent
2038 * and child shouldn't be talking the parent still
2039 * may expect to know when the child exits.
2045 * smack_task_to_inode - copy task smack into the inode blob
2046 * @p: task to copy from
2047 * @inode: inode to copy to
2049 * Sets the smack pointer in the inode security blob
2051 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2053 struct inode_smack
*isp
= inode
->i_security
;
2054 struct smack_known
*skp
= smk_of_task_struct(p
);
2056 isp
->smk_inode
= skp
;
2064 * smack_sk_alloc_security - Allocate a socket blob
2067 * @gfp_flags: memory allocation flags
2069 * Assign Smack pointers to current
2071 * Returns 0 on success, -ENOMEM is there's no memory
2073 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2075 struct smack_known
*skp
= smk_of_current();
2076 struct socket_smack
*ssp
;
2078 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2084 ssp
->smk_packet
= NULL
;
2086 sk
->sk_security
= ssp
;
2092 * smack_sk_free_security - Free a socket blob
2095 * Clears the blob pointer
2097 static void smack_sk_free_security(struct sock
*sk
)
2099 kfree(sk
->sk_security
);
2103 * smack_host_label - check host based restrictions
2104 * @sip: the object end
2106 * looks for host based access restrictions
2108 * This version will only be appropriate for really small sets of single label
2109 * hosts. The caller is responsible for ensuring that the RCU read lock is
2110 * taken before calling this function.
2112 * Returns the label of the far end or NULL if it's not special.
2114 static struct smack_known
*smack_host_label(struct sockaddr_in
*sip
)
2116 struct smk_netlbladdr
*snp
;
2117 struct in_addr
*siap
= &sip
->sin_addr
;
2119 if (siap
->s_addr
== 0)
2122 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
2124 * we break after finding the first match because
2125 * the list is sorted from longest to shortest mask
2126 * so we have found the most specific match
2128 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
2129 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
2130 /* we have found the special CIPSO option */
2131 if (snp
->smk_label
== &smack_cipso_option
)
2133 return snp
->smk_label
;
2140 * smack_netlabel - Set the secattr on a socket
2142 * @labeled: socket label scheme
2144 * Convert the outbound smack value (smk_out) to a
2145 * secattr and attach it to the socket.
2147 * Returns 0 on success or an error code
2149 static int smack_netlabel(struct sock
*sk
, int labeled
)
2151 struct smack_known
*skp
;
2152 struct socket_smack
*ssp
= sk
->sk_security
;
2156 * Usually the netlabel code will handle changing the
2157 * packet labeling based on the label.
2158 * The case of a single label host is different, because
2159 * a single label host should never get a labeled packet
2160 * even though the label is usually associated with a packet
2164 bh_lock_sock_nested(sk
);
2166 if (ssp
->smk_out
== smack_net_ambient
||
2167 labeled
== SMACK_UNLABELED_SOCKET
)
2168 netlbl_sock_delattr(sk
);
2171 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2181 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2183 * @sap: the destination address
2185 * Set the correct secattr for the given socket based on the destination
2186 * address and perform any outbound access checks needed.
2188 * Returns 0 on success or an error code.
2191 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2193 struct smack_known
*skp
;
2196 struct smack_known
*hkp
;
2197 struct socket_smack
*ssp
= sk
->sk_security
;
2198 struct smk_audit_info ad
;
2201 hkp
= smack_host_label(sap
);
2204 struct lsm_network_audit net
;
2206 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2207 ad
.a
.u
.net
->family
= sap
->sin_family
;
2208 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2209 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2211 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2213 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2214 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2216 sk_lbl
= SMACK_CIPSO_SOCKET
;
2223 return smack_netlabel(sk
, sk_lbl
);
2226 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2228 * smk_ipv6_port_label - Smack port access table management
2232 * Create or update the port list entry
2234 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2236 struct sock
*sk
= sock
->sk
;
2237 struct sockaddr_in6
*addr6
;
2238 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2239 struct smk_port_label
*spp
;
2240 unsigned short port
= 0;
2242 if (address
== NULL
) {
2244 * This operation is changing the Smack information
2245 * on the bound socket. Take the changes to the port
2248 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2249 if (sk
!= spp
->smk_sock
)
2251 spp
->smk_in
= ssp
->smk_in
;
2252 spp
->smk_out
= ssp
->smk_out
;
2256 * A NULL address is only used for updating existing
2257 * bound entries. If there isn't one, it's OK.
2262 addr6
= (struct sockaddr_in6
*)address
;
2263 port
= ntohs(addr6
->sin6_port
);
2265 * This is a special case that is safely ignored.
2271 * Look for an existing port list entry.
2272 * This is an indication that a port is getting reused.
2274 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2275 if (spp
->smk_port
!= port
)
2277 spp
->smk_port
= port
;
2279 spp
->smk_in
= ssp
->smk_in
;
2280 spp
->smk_out
= ssp
->smk_out
;
2285 * A new port entry is required.
2287 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2291 spp
->smk_port
= port
;
2293 spp
->smk_in
= ssp
->smk_in
;
2294 spp
->smk_out
= ssp
->smk_out
;
2296 list_add(&spp
->list
, &smk_ipv6_port_list
);
2301 * smk_ipv6_port_check - check Smack port access
2305 * Create or update the port list entry
2307 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2312 struct smk_port_label
*spp
;
2313 struct socket_smack
*ssp
= sk
->sk_security
;
2314 struct smack_known
*skp
;
2315 unsigned short port
= 0;
2316 struct smack_known
*object
;
2317 struct smk_audit_info ad
;
2320 struct lsm_network_audit net
;
2323 if (act
== SMK_RECEIVING
) {
2324 skp
= smack_net_ambient
;
2325 object
= ssp
->smk_in
;
2328 object
= smack_net_ambient
;
2332 * Get the IP address and port from the address.
2334 port
= ntohs(address
->sin6_port
);
2335 bep
= (__be16
*)(&address
->sin6_addr
);
2336 be32p
= (__be32
*)(&address
->sin6_addr
);
2339 * It's remote, so port lookup does no good.
2341 if (be32p
[0] || be32p
[1] || be32p
[2] || bep
[6] || ntohs(bep
[7]) != 1)
2345 * It's local so the send check has to have passed.
2347 if (act
== SMK_RECEIVING
) {
2348 skp
= &smack_known_web
;
2352 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2353 if (spp
->smk_port
!= port
)
2355 object
= spp
->smk_in
;
2356 if (act
== SMK_CONNECTING
)
2357 ssp
->smk_packet
= spp
->smk_out
;
2364 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2365 ad
.a
.u
.net
->family
= sk
->sk_family
;
2366 ad
.a
.u
.net
->dport
= port
;
2367 if (act
== SMK_RECEIVING
)
2368 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2370 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2372 rc
= smk_access(skp
, object
, MAY_WRITE
, &ad
);
2373 rc
= smk_bu_note("IPv6 port check", skp
, object
, MAY_WRITE
, rc
);
2376 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2379 * smack_inode_setsecurity - set smack xattrs
2380 * @inode: the object
2381 * @name: attribute name
2382 * @value: attribute value
2383 * @size: size of the attribute
2386 * Sets the named attribute in the appropriate blob
2388 * Returns 0 on success, or an error code
2390 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2391 const void *value
, size_t size
, int flags
)
2393 struct smack_known
*skp
;
2394 struct inode_smack
*nsp
= inode
->i_security
;
2395 struct socket_smack
*ssp
;
2396 struct socket
*sock
;
2399 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2402 skp
= smk_import_entry(value
, size
);
2406 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2407 nsp
->smk_inode
= skp
;
2408 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2412 * The rest of the Smack xattrs are only on sockets.
2414 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2417 sock
= SOCKET_I(inode
);
2418 if (sock
== NULL
|| sock
->sk
== NULL
)
2421 ssp
= sock
->sk
->sk_security
;
2423 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2425 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2427 if (sock
->sk
->sk_family
== PF_INET
) {
2428 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2431 "Smack: \"%s\" netlbl error %d.\n",
2437 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2438 if (sock
->sk
->sk_family
== PF_INET6
)
2439 smk_ipv6_port_label(sock
, NULL
);
2440 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2446 * smack_socket_post_create - finish socket setup
2448 * @family: protocol family
2453 * Sets the netlabel information on the socket
2455 * Returns 0 on success, and error code otherwise
2457 static int smack_socket_post_create(struct socket
*sock
, int family
,
2458 int type
, int protocol
, int kern
)
2460 struct socket_smack
*ssp
;
2462 if (sock
->sk
== NULL
)
2466 * Sockets created by kernel threads receive web label.
2468 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2469 ssp
= sock
->sk
->sk_security
;
2470 ssp
->smk_in
= &smack_known_web
;
2471 ssp
->smk_out
= &smack_known_web
;
2474 if (family
!= PF_INET
)
2477 * Set the outbound netlbl.
2479 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2482 #ifndef CONFIG_SECURITY_SMACK_NETFILTER
2484 * smack_socket_bind - record port binding information.
2486 * @address: the port address
2487 * @addrlen: size of the address
2489 * Records the label bound to a port.
2493 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2496 #if IS_ENABLED(CONFIG_IPV6)
2497 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2498 smk_ipv6_port_label(sock
, address
);
2503 #endif /* !CONFIG_SECURITY_SMACK_NETFILTER */
2506 * smack_socket_connect - connect access check
2508 * @sap: the other end
2509 * @addrlen: size of sap
2511 * Verifies that a connection may be possible
2513 * Returns 0 on success, and error code otherwise
2515 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2520 if (sock
->sk
== NULL
)
2523 switch (sock
->sk
->sk_family
) {
2525 if (addrlen
< sizeof(struct sockaddr_in
))
2527 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2530 if (addrlen
< sizeof(struct sockaddr_in6
))
2532 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
2533 rc
= smk_ipv6_port_check(sock
->sk
, (struct sockaddr_in6
*)sap
,
2535 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
2542 * smack_flags_to_may - convert S_ to MAY_ values
2543 * @flags: the S_ value
2545 * Returns the equivalent MAY_ value
2547 static int smack_flags_to_may(int flags
)
2551 if (flags
& S_IRUGO
)
2553 if (flags
& S_IWUGO
)
2555 if (flags
& S_IXUGO
)
2562 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2567 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2569 struct smack_known
*skp
= smk_of_current();
2571 msg
->security
= skp
;
2576 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2579 * Clears the blob pointer
2581 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2583 msg
->security
= NULL
;
2587 * smack_of_shm - the smack pointer for the shm
2590 * Returns a pointer to the smack value
2592 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2594 return (struct smack_known
*)shp
->shm_perm
.security
;
2598 * smack_shm_alloc_security - Set the security blob for shm
2603 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2605 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2606 struct smack_known
*skp
= smk_of_current();
2608 isp
->security
= skp
;
2613 * smack_shm_free_security - Clear the security blob for shm
2616 * Clears the blob pointer
2618 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2620 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2622 isp
->security
= NULL
;
2626 * smk_curacc_shm : check if current has access on shm
2628 * @access : access requested
2630 * Returns 0 if current has the requested access, error code otherwise
2632 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2634 struct smack_known
*ssp
= smack_of_shm(shp
);
2635 struct smk_audit_info ad
;
2639 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2640 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2642 rc
= smk_curacc(ssp
, access
, &ad
);
2643 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2648 * smack_shm_associate - Smack access check for shm
2650 * @shmflg: access requested
2652 * Returns 0 if current has the requested access, error code otherwise
2654 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2658 may
= smack_flags_to_may(shmflg
);
2659 return smk_curacc_shm(shp
, may
);
2663 * smack_shm_shmctl - Smack access check for shm
2665 * @cmd: what it wants to do
2667 * Returns 0 if current has the requested access, error code otherwise
2669 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2682 may
= MAY_READWRITE
;
2687 * System level information.
2693 return smk_curacc_shm(shp
, may
);
2697 * smack_shm_shmat - Smack access for shmat
2700 * @shmflg: access requested
2702 * Returns 0 if current has the requested access, error code otherwise
2704 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2709 may
= smack_flags_to_may(shmflg
);
2710 return smk_curacc_shm(shp
, may
);
2714 * smack_of_sem - the smack pointer for the sem
2717 * Returns a pointer to the smack value
2719 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
2721 return (struct smack_known
*)sma
->sem_perm
.security
;
2725 * smack_sem_alloc_security - Set the security blob for sem
2730 static int smack_sem_alloc_security(struct sem_array
*sma
)
2732 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2733 struct smack_known
*skp
= smk_of_current();
2735 isp
->security
= skp
;
2740 * smack_sem_free_security - Clear the security blob for sem
2743 * Clears the blob pointer
2745 static void smack_sem_free_security(struct sem_array
*sma
)
2747 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2749 isp
->security
= NULL
;
2753 * smk_curacc_sem : check if current has access on sem
2755 * @access : access requested
2757 * Returns 0 if current has the requested access, error code otherwise
2759 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2761 struct smack_known
*ssp
= smack_of_sem(sma
);
2762 struct smk_audit_info ad
;
2766 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2767 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2769 rc
= smk_curacc(ssp
, access
, &ad
);
2770 rc
= smk_bu_current("sem", ssp
, access
, rc
);
2775 * smack_sem_associate - Smack access check for sem
2777 * @semflg: access requested
2779 * Returns 0 if current has the requested access, error code otherwise
2781 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2785 may
= smack_flags_to_may(semflg
);
2786 return smk_curacc_sem(sma
, may
);
2790 * smack_sem_shmctl - Smack access check for sem
2792 * @cmd: what it wants to do
2794 * Returns 0 if current has the requested access, error code otherwise
2796 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2814 may
= MAY_READWRITE
;
2819 * System level information
2826 return smk_curacc_sem(sma
, may
);
2830 * smack_sem_semop - Smack checks of semaphore operations
2836 * Treated as read and write in all cases.
2838 * Returns 0 if access is allowed, error code otherwise
2840 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2841 unsigned nsops
, int alter
)
2843 return smk_curacc_sem(sma
, MAY_READWRITE
);
2847 * smack_msg_alloc_security - Set the security blob for msg
2852 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2854 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2855 struct smack_known
*skp
= smk_of_current();
2857 kisp
->security
= skp
;
2862 * smack_msg_free_security - Clear the security blob for msg
2865 * Clears the blob pointer
2867 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2869 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2871 kisp
->security
= NULL
;
2875 * smack_of_msq - the smack pointer for the msq
2878 * Returns a pointer to the smack label entry
2880 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
2882 return (struct smack_known
*)msq
->q_perm
.security
;
2886 * smk_curacc_msq : helper to check if current has access on msq
2888 * @access : access requested
2890 * return 0 if current has access, error otherwise
2892 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2894 struct smack_known
*msp
= smack_of_msq(msq
);
2895 struct smk_audit_info ad
;
2899 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2900 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2902 rc
= smk_curacc(msp
, access
, &ad
);
2903 rc
= smk_bu_current("msq", msp
, access
, rc
);
2908 * smack_msg_queue_associate - Smack access check for msg_queue
2910 * @msqflg: access requested
2912 * Returns 0 if current has the requested access, error code otherwise
2914 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2918 may
= smack_flags_to_may(msqflg
);
2919 return smk_curacc_msq(msq
, may
);
2923 * smack_msg_queue_msgctl - Smack access check for msg_queue
2925 * @cmd: what it wants to do
2927 * Returns 0 if current has the requested access, error code otherwise
2929 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2940 may
= MAY_READWRITE
;
2945 * System level information
2952 return smk_curacc_msq(msq
, may
);
2956 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2959 * @msqflg: access requested
2961 * Returns 0 if current has the requested access, error code otherwise
2963 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2968 may
= smack_flags_to_may(msqflg
);
2969 return smk_curacc_msq(msq
, may
);
2973 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2980 * Returns 0 if current has read and write access, error code otherwise
2982 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2983 struct task_struct
*target
, long type
, int mode
)
2985 return smk_curacc_msq(msq
, MAY_READWRITE
);
2989 * smack_ipc_permission - Smack access for ipc_permission()
2990 * @ipp: the object permissions
2991 * @flag: access requested
2993 * Returns 0 if current has read and write access, error code otherwise
2995 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2997 struct smack_known
*iskp
= ipp
->security
;
2998 int may
= smack_flags_to_may(flag
);
2999 struct smk_audit_info ad
;
3003 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3004 ad
.a
.u
.ipc_id
= ipp
->id
;
3006 rc
= smk_curacc(iskp
, may
, &ad
);
3007 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3012 * smack_ipc_getsecid - Extract smack security id
3013 * @ipp: the object permissions
3014 * @secid: where result will be saved
3016 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3018 struct smack_known
*iskp
= ipp
->security
;
3020 *secid
= iskp
->smk_secid
;
3024 * smack_d_instantiate - Make sure the blob is correct on an inode
3025 * @opt_dentry: dentry where inode will be attached
3026 * @inode: the object
3028 * Set the inode's security blob if it hasn't been done already.
3030 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3032 struct super_block
*sbp
;
3033 struct superblock_smack
*sbsp
;
3034 struct inode_smack
*isp
;
3035 struct smack_known
*skp
;
3036 struct smack_known
*ckp
= smk_of_current();
3037 struct smack_known
*final
;
3038 char trattr
[TRANS_TRUE_SIZE
];
3046 isp
= inode
->i_security
;
3048 mutex_lock(&isp
->smk_lock
);
3050 * If the inode is already instantiated
3051 * take the quick way out
3053 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3057 sbsp
= sbp
->s_security
;
3059 * We're going to use the superblock default label
3060 * if there's no label on the file.
3062 final
= sbsp
->smk_default
;
3065 * If this is the root inode the superblock
3066 * may be in the process of initialization.
3067 * If that is the case use the root value out
3068 * of the superblock.
3070 if (opt_dentry
->d_parent
== opt_dentry
) {
3071 switch (sbp
->s_magic
) {
3072 case CGROUP_SUPER_MAGIC
:
3074 * The cgroup filesystem is never mounted,
3075 * so there's no opportunity to set the mount
3078 sbsp
->smk_root
= &smack_known_star
;
3079 sbsp
->smk_default
= &smack_known_star
;
3080 isp
->smk_inode
= sbsp
->smk_root
;
3084 * What about shmem/tmpfs anonymous files with dentry
3085 * obtained from d_alloc_pseudo()?
3087 isp
->smk_inode
= smk_of_current();
3090 isp
->smk_inode
= sbsp
->smk_root
;
3093 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3098 * This is pretty hackish.
3099 * Casey says that we shouldn't have to do
3100 * file system specific code, but it does help
3101 * with keeping it simple.
3103 switch (sbp
->s_magic
) {
3107 case CGROUP_SUPER_MAGIC
:
3109 * Casey says that it's a little embarrassing
3110 * that the smack file system doesn't do
3111 * extended attributes.
3113 * Casey says pipes are easy (?)
3115 * Socket access is controlled by the socket
3116 * structures associated with the task involved.
3118 * Cgroupfs is special
3120 final
= &smack_known_star
;
3122 case DEVPTS_SUPER_MAGIC
:
3124 * devpts seems content with the label of the task.
3125 * Programs that change smack have to treat the
3130 case PROC_SUPER_MAGIC
:
3132 * Casey says procfs appears not to care.
3133 * The superblock default suffices.
3138 * Device labels should come from the filesystem,
3139 * but watch out, because they're volitile,
3140 * getting recreated on every reboot.
3142 final
= &smack_known_star
;
3146 * If a smack value has been set we want to use it,
3147 * but since tmpfs isn't giving us the opportunity
3148 * to set mount options simulate setting the
3149 * superblock default.
3153 * This isn't an understood special case.
3154 * Get the value from the xattr.
3158 * UNIX domain sockets use lower level socket data.
3160 if (S_ISSOCK(inode
->i_mode
)) {
3161 final
= &smack_known_star
;
3165 * No xattr support means, alas, no SMACK label.
3166 * Use the aforeapplied default.
3167 * It would be curious if the label of the task
3168 * does not match that assigned.
3170 if (inode
->i_op
->getxattr
== NULL
)
3173 * Get the dentry for xattr.
3175 dp
= dget(opt_dentry
);
3176 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3181 * Transmuting directory
3183 if (S_ISDIR(inode
->i_mode
)) {
3185 * If this is a new directory and the label was
3186 * transmuted when the inode was initialized
3187 * set the transmute attribute on the directory
3188 * and mark the inode.
3190 * If there is a transmute attribute on the
3191 * directory mark the inode.
3193 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3194 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3195 rc
= inode
->i_op
->setxattr(dp
,
3196 XATTR_NAME_SMACKTRANSMUTE
,
3197 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3200 rc
= inode
->i_op
->getxattr(dp
,
3201 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3203 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3204 TRANS_TRUE_SIZE
) != 0)
3208 transflag
= SMK_INODE_TRANSMUTE
;
3211 * Don't let the exec or mmap label be "*" or "@".
3213 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3214 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3216 isp
->smk_task
= skp
;
3217 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3218 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3220 isp
->smk_mmap
= skp
;
3227 isp
->smk_inode
= ckp
;
3229 isp
->smk_inode
= final
;
3231 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3234 mutex_unlock(&isp
->smk_lock
);
3239 * smack_getprocattr - Smack process attribute access
3240 * @p: the object task
3241 * @name: the name of the attribute in /proc/.../attr
3242 * @value: where to put the result
3244 * Places a copy of the task Smack into value
3246 * Returns the length of the smack label or an error code
3248 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3250 struct smack_known
*skp
= smk_of_task_struct(p
);
3254 if (strcmp(name
, "current") != 0)
3257 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3267 * smack_setprocattr - Smack process attribute setting
3268 * @p: the object task
3269 * @name: the name of the attribute in /proc/.../attr
3270 * @value: the value to set
3271 * @size: the size of the value
3273 * Sets the Smack value of the task. Only setting self
3274 * is permitted and only with privilege
3276 * Returns the length of the smack label or an error code
3278 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3279 void *value
, size_t size
)
3281 struct task_smack
*tsp
;
3283 struct smack_known
*skp
;
3286 * Changing another process' Smack value is too dangerous
3287 * and supports no sane use case.
3292 if (!smack_privileged(CAP_MAC_ADMIN
))
3295 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3298 if (strcmp(name
, "current") != 0)
3301 skp
= smk_import_entry(value
, size
);
3306 * No process is ever allowed the web ("@") label.
3308 if (skp
== &smack_known_web
)
3311 new = prepare_creds();
3315 tsp
= new->security
;
3316 tsp
->smk_task
= skp
;
3323 * smack_unix_stream_connect - Smack access on UDS
3325 * @other: the other sock
3328 * Return 0 if a subject with the smack of sock could access
3329 * an object with the smack of other, otherwise an error code
3331 static int smack_unix_stream_connect(struct sock
*sock
,
3332 struct sock
*other
, struct sock
*newsk
)
3334 struct smack_known
*skp
;
3335 struct smack_known
*okp
;
3336 struct socket_smack
*ssp
= sock
->sk_security
;
3337 struct socket_smack
*osp
= other
->sk_security
;
3338 struct socket_smack
*nsp
= newsk
->sk_security
;
3339 struct smk_audit_info ad
;
3342 struct lsm_network_audit net
;
3345 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3349 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3350 smk_ad_setfield_u_net_sk(&ad
, other
);
3352 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3353 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3357 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3358 rc
= smk_bu_note("UDS connect", okp
, skp
,
3364 * Cross reference the peer labels for SO_PEERSEC.
3367 nsp
->smk_packet
= ssp
->smk_out
;
3368 ssp
->smk_packet
= osp
->smk_out
;
3375 * smack_unix_may_send - Smack access on UDS
3377 * @other: the other socket
3379 * Return 0 if a subject with the smack of sock could access
3380 * an object with the smack of other, otherwise an error code
3382 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3384 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3385 struct socket_smack
*osp
= other
->sk
->sk_security
;
3386 struct smk_audit_info ad
;
3390 struct lsm_network_audit net
;
3392 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3393 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3396 if (smack_privileged(CAP_MAC_OVERRIDE
))
3399 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3400 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3405 * smack_socket_sendmsg - Smack check based on destination host
3408 * @size: the size of the message
3410 * Return 0 if the current subject can write to the destination host.
3411 * For IPv4 this is only a question if the destination is a single label host.
3412 * For IPv6 this is a check against the label of the port.
3414 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3417 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3418 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
3419 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3420 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
3424 * Perfectly reasonable for this to be NULL
3429 switch (sip
->sin_family
) {
3431 rc
= smack_netlabel_send(sock
->sk
, sip
);
3434 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
3435 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3436 #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
3443 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3444 * @sap: netlabel secattr
3445 * @ssp: socket security information
3447 * Returns a pointer to a Smack label entry found on the label list.
3449 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3450 struct socket_smack
*ssp
)
3452 struct smack_known
*skp
;
3457 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3459 * Looks like a CIPSO packet.
3460 * If there are flags but no level netlabel isn't
3461 * behaving the way we expect it to.
3463 * Look it up in the label table
3464 * Without guidance regarding the smack value
3465 * for the packet fall back on the network
3469 list_for_each_entry(skp
, &smack_known_list
, list
) {
3470 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3473 * Compare the catsets. Use the netlbl APIs.
3475 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3476 if ((skp
->smk_netlabel
.flags
&
3477 NETLBL_SECATTR_MLS_CAT
) == 0)
3481 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3482 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3484 kcat
= netlbl_catmap_walk(
3485 skp
->smk_netlabel
.attr
.mls
.cat
,
3487 if (acat
< 0 || kcat
< 0)
3500 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3501 return &smack_known_web
;
3502 return &smack_known_star
;
3504 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3506 * Looks like a fallback, which gives us a secid.
3508 skp
= smack_from_secid(sap
->attr
.secid
);
3510 * This has got to be a bug because it is
3511 * impossible to specify a fallback without
3512 * specifying the label, which will ensure
3513 * it has a secid, and the only way to get a
3514 * secid is from a fallback.
3516 BUG_ON(skp
== NULL
);
3520 * Without guidance regarding the smack value
3521 * for the packet fall back on the network
3524 return smack_net_ambient
;
3527 #if IS_ENABLED(CONFIG_IPV6)
3528 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3532 int proto
= -EINVAL
;
3533 struct ipv6hdr _ipv6h
;
3534 struct ipv6hdr
*ip6
;
3536 struct tcphdr _tcph
, *th
;
3537 struct udphdr _udph
, *uh
;
3538 struct dccp_hdr _dccph
, *dh
;
3542 offset
= skb_network_offset(skb
);
3543 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3546 sip
->sin6_addr
= ip6
->saddr
;
3548 nexthdr
= ip6
->nexthdr
;
3549 offset
+= sizeof(_ipv6h
);
3550 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3557 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3559 sip
->sin6_port
= th
->source
;
3562 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3564 sip
->sin6_port
= uh
->source
;
3567 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3569 sip
->sin6_port
= dh
->dccph_sport
;
3574 #endif /* CONFIG_IPV6 */
3577 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3581 * Returns 0 if the packet should be delivered, an error code otherwise
3583 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3585 struct netlbl_lsm_secattr secattr
;
3586 struct socket_smack
*ssp
= sk
->sk_security
;
3587 struct smack_known
*skp
= NULL
;
3589 struct smk_audit_info ad
;
3591 struct lsm_network_audit net
;
3593 #if IS_ENABLED(CONFIG_IPV6)
3594 struct sockaddr_in6 sadd
;
3596 #endif /* CONFIG_IPV6 */
3598 switch (sk
->sk_family
) {
3600 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3602 * If there is a secmark use it rather than the CIPSO label.
3603 * If there is no secmark fall back to CIPSO.
3604 * The secmark is assumed to reflect policy better.
3606 if (skb
&& skb
->secmark
!= 0) {
3607 skp
= smack_from_secid(skb
->secmark
);
3610 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3612 * Translate what netlabel gave us.
3614 netlbl_secattr_init(&secattr
);
3616 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3618 skp
= smack_from_secattr(&secattr
, ssp
);
3620 skp
= smack_net_ambient
;
3622 netlbl_secattr_destroy(&secattr
);
3624 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3628 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3629 ad
.a
.u
.net
->family
= sk
->sk_family
;
3630 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3631 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3634 * Receiving a packet requires that the other end
3635 * be able to write here. Read access is not required.
3636 * This is the simplist possible security model
3639 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3640 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3643 netlbl_skbuff_err(skb
, rc
, 0);
3645 #if IS_ENABLED(CONFIG_IPV6)
3647 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3648 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
3650 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3651 if (skb
&& skb
->secmark
!= 0)
3652 skp
= smack_from_secid(skb
->secmark
);
3654 skp
= smack_net_ambient
;
3656 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3657 ad
.a
.u
.net
->family
= sk
->sk_family
;
3658 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3659 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3660 #endif /* CONFIG_AUDIT */
3661 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3662 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
3664 #else /* CONFIG_SECURITY_SMACK_NETFILTER */
3665 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3666 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3668 #endif /* CONFIG_IPV6 */
3675 * smack_socket_getpeersec_stream - pull in packet label
3677 * @optval: user's destination
3678 * @optlen: size thereof
3681 * returns zero on success, an error code otherwise
3683 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3684 char __user
*optval
,
3685 int __user
*optlen
, unsigned len
)
3687 struct socket_smack
*ssp
;
3692 ssp
= sock
->sk
->sk_security
;
3693 if (ssp
->smk_packet
!= NULL
) {
3694 rcp
= ssp
->smk_packet
->smk_known
;
3695 slen
= strlen(rcp
) + 1;
3700 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3703 if (put_user(slen
, optlen
) != 0)
3711 * smack_socket_getpeersec_dgram - pull in packet label
3712 * @sock: the peer socket
3714 * @secid: pointer to where to put the secid of the packet
3716 * Sets the netlabel socket state on sk from parent
3718 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
3719 struct sk_buff
*skb
, u32
*secid
)
3722 struct netlbl_lsm_secattr secattr
;
3723 struct socket_smack
*ssp
= NULL
;
3724 struct smack_known
*skp
;
3725 int family
= PF_UNSPEC
;
3726 u32 s
= 0; /* 0 is the invalid secid */
3730 if (skb
->protocol
== htons(ETH_P_IP
))
3732 #if IS_ENABLED(CONFIG_IPV6)
3733 else if (skb
->protocol
== htons(ETH_P_IPV6
))
3735 #endif /* CONFIG_IPV6 */
3737 if (family
== PF_UNSPEC
&& sock
!= NULL
)
3738 family
= sock
->sk
->sk_family
;
3742 ssp
= sock
->sk
->sk_security
;
3743 s
= ssp
->smk_out
->smk_secid
;
3746 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3752 * Translate what netlabel gave us.
3754 if (sock
!= NULL
&& sock
->sk
!= NULL
)
3755 ssp
= sock
->sk
->sk_security
;
3756 netlbl_secattr_init(&secattr
);
3757 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3759 skp
= smack_from_secattr(&secattr
, ssp
);
3762 netlbl_secattr_destroy(&secattr
);
3764 #if IS_ENABLED(CONFIG_IPV6)
3766 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3768 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3770 #endif /* CONFIG_IPV6 */
3779 * smack_sock_graft - Initialize a newly created socket with an existing sock
3781 * @parent: parent socket
3783 * Set the smk_{in,out} state of an existing sock based on the process that
3784 * is creating the new socket.
3786 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3788 struct socket_smack
*ssp
;
3789 struct smack_known
*skp
= smk_of_current();
3792 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3795 ssp
= sk
->sk_security
;
3798 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3802 * smack_inet_conn_request - Smack access check on connect
3803 * @sk: socket involved
3807 * Returns 0 if a task with the packet label could write to
3808 * the socket, otherwise an error code
3810 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3811 struct request_sock
*req
)
3813 u16 family
= sk
->sk_family
;
3814 struct smack_known
*skp
;
3815 struct socket_smack
*ssp
= sk
->sk_security
;
3816 struct netlbl_lsm_secattr secattr
;
3817 struct sockaddr_in addr
;
3819 struct smack_known
*hskp
;
3821 struct smk_audit_info ad
;
3823 struct lsm_network_audit net
;
3826 #if IS_ENABLED(CONFIG_IPV6)
3827 if (family
== PF_INET6
) {
3829 * Handle mapped IPv4 packets arriving
3830 * via IPv6 sockets. Don't set up netlabel
3831 * processing on IPv6.
3833 if (skb
->protocol
== htons(ETH_P_IP
))
3838 #endif /* CONFIG_IPV6 */
3840 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3842 * If there is a secmark use it rather than the CIPSO label.
3843 * If there is no secmark fall back to CIPSO.
3844 * The secmark is assumed to reflect policy better.
3846 if (skb
&& skb
->secmark
!= 0) {
3847 skp
= smack_from_secid(skb
->secmark
);
3850 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3852 netlbl_secattr_init(&secattr
);
3853 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3855 skp
= smack_from_secattr(&secattr
, ssp
);
3857 skp
= &smack_known_huh
;
3858 netlbl_secattr_destroy(&secattr
);
3860 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3865 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3866 ad
.a
.u
.net
->family
= family
;
3867 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3868 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3871 * Receiving a packet requires that the other end be able to write
3872 * here. Read access is not required.
3874 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3875 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
3880 * Save the peer's label in the request_sock so we can later setup
3881 * smk_packet in the child socket so that SO_PEERCRED can report it.
3883 req
->peer_secid
= skp
->smk_secid
;
3886 * We need to decide if we want to label the incoming connection here
3887 * if we do we only need to label the request_sock and the stack will
3888 * propagate the wire-label to the sock when it is created.
3891 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3893 hskp
= smack_host_label(&addr
);
3897 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
3899 netlbl_req_delattr(req
);
3905 * smack_inet_csk_clone - Copy the connection information to the new socket
3906 * @sk: the new socket
3907 * @req: the connection's request_sock
3909 * Transfer the connection's peer label to the newly created socket.
3911 static void smack_inet_csk_clone(struct sock
*sk
,
3912 const struct request_sock
*req
)
3914 struct socket_smack
*ssp
= sk
->sk_security
;
3915 struct smack_known
*skp
;
3917 if (req
->peer_secid
!= 0) {
3918 skp
= smack_from_secid(req
->peer_secid
);
3919 ssp
->smk_packet
= skp
;
3921 ssp
->smk_packet
= NULL
;
3925 * Key management security hooks
3927 * Casey has not tested key support very heavily.
3928 * The permission check is most likely too restrictive.
3929 * If you care about keys please have a look.
3934 * smack_key_alloc - Set the key security blob
3936 * @cred: the credentials to use
3939 * No allocation required
3943 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3944 unsigned long flags
)
3946 struct smack_known
*skp
= smk_of_task(cred
->security
);
3948 key
->security
= skp
;
3953 * smack_key_free - Clear the key security blob
3956 * Clear the blob pointer
3958 static void smack_key_free(struct key
*key
)
3960 key
->security
= NULL
;
3964 * smack_key_permission - Smack access on a key
3965 * @key_ref: gets to the object
3966 * @cred: the credentials to use
3967 * @perm: requested key permissions
3969 * Return 0 if the task has read and write to the object,
3970 * an error code otherwise
3972 static int smack_key_permission(key_ref_t key_ref
,
3973 const struct cred
*cred
, unsigned perm
)
3976 struct smk_audit_info ad
;
3977 struct smack_known
*tkp
= smk_of_task(cred
->security
);
3981 keyp
= key_ref_to_ptr(key_ref
);
3985 * If the key hasn't been initialized give it access so that
3988 if (keyp
->security
== NULL
)
3991 * This should not occur
3996 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3997 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3998 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4000 if (perm
& KEY_NEED_READ
)
4002 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4003 request
= MAY_WRITE
;
4004 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4005 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4010 * smack_key_getsecurity - Smack label tagging the key
4011 * @key points to the key to be queried
4012 * @_buffer points to a pointer that should be set to point to the
4013 * resulting string (if no label or an error occurs).
4014 * Return the length of the string (including terminating NUL) or -ve if
4016 * May also return 0 (and a NULL buffer pointer) if there is no label.
4018 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4020 struct smack_known
*skp
= key
->security
;
4024 if (key
->security
== NULL
) {
4029 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4032 length
= strlen(copy
) + 1;
4038 #endif /* CONFIG_KEYS */
4043 * Audit requires a unique representation of each Smack specific
4044 * rule. This unique representation is used to distinguish the
4045 * object to be audited from remaining kernel objects and also
4046 * works as a glue between the audit hooks.
4048 * Since repository entries are added but never deleted, we'll use
4049 * the smack_known label address related to the given audit rule as
4050 * the needed unique representation. This also better fits the smack
4051 * model where nearly everything is a label.
4056 * smack_audit_rule_init - Initialize a smack audit rule
4057 * @field: audit rule fields given from user-space (audit.h)
4058 * @op: required testing operator (=, !=, >, <, ...)
4059 * @rulestr: smack label to be audited
4060 * @vrule: pointer to save our own audit rule representation
4062 * Prepare to audit cases where (@field @op @rulestr) is true.
4063 * The label to be audited is created if necessay.
4065 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4067 struct smack_known
*skp
;
4068 char **rule
= (char **)vrule
;
4071 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4074 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4077 skp
= smk_import_entry(rulestr
, 0);
4079 *rule
= skp
->smk_known
;
4085 * smack_audit_rule_known - Distinguish Smack audit rules
4086 * @krule: rule of interest, in Audit kernel representation format
4088 * This is used to filter Smack rules from remaining Audit ones.
4089 * If it's proved that this rule belongs to us, the
4090 * audit_rule_match hook will be called to do the final judgement.
4092 static int smack_audit_rule_known(struct audit_krule
*krule
)
4094 struct audit_field
*f
;
4097 for (i
= 0; i
< krule
->field_count
; i
++) {
4098 f
= &krule
->fields
[i
];
4100 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4108 * smack_audit_rule_match - Audit given object ?
4109 * @secid: security id for identifying the object to test
4110 * @field: audit rule flags given from user-space
4111 * @op: required testing operator
4112 * @vrule: smack internal rule presentation
4113 * @actx: audit context associated with the check
4115 * The core Audit hook. It's used to take the decision of
4116 * whether to audit or not to audit a given object.
4118 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4119 struct audit_context
*actx
)
4121 struct smack_known
*skp
;
4124 if (unlikely(!rule
)) {
4125 WARN_ONCE(1, "Smack: missing rule\n");
4129 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4132 skp
= smack_from_secid(secid
);
4135 * No need to do string comparisons. If a match occurs,
4136 * both pointers will point to the same smack_known
4139 if (op
== Audit_equal
)
4140 return (rule
== skp
->smk_known
);
4141 if (op
== Audit_not_equal
)
4142 return (rule
!= skp
->smk_known
);
4148 * smack_audit_rule_free - free smack rule representation
4149 * @vrule: rule to be freed.
4151 * No memory was allocated.
4153 static void smack_audit_rule_free(void *vrule
)
4158 #endif /* CONFIG_AUDIT */
4161 * smack_ismaclabel - check if xattr @name references a smack MAC label
4162 * @name: Full xattr name to check.
4164 static int smack_ismaclabel(const char *name
)
4166 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4171 * smack_secid_to_secctx - return the smack label for a secid
4172 * @secid: incoming integer
4173 * @secdata: destination
4174 * @seclen: how long it is
4176 * Exists for networking code.
4178 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4180 struct smack_known
*skp
= smack_from_secid(secid
);
4183 *secdata
= skp
->smk_known
;
4184 *seclen
= strlen(skp
->smk_known
);
4189 * smack_secctx_to_secid - return the secid for a smack label
4190 * @secdata: smack label
4191 * @seclen: how long result is
4192 * @secid: outgoing integer
4194 * Exists for audit and networking code.
4196 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4198 struct smack_known
*skp
= smk_find_entry(secdata
);
4201 *secid
= skp
->smk_secid
;
4208 * smack_release_secctx - don't do anything.
4212 * Exists to make sure nothing gets done, and properly
4214 static void smack_release_secctx(char *secdata
, u32 seclen
)
4218 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4220 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4223 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4225 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4228 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4231 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4239 struct security_hook_list smack_hooks
[] = {
4240 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4241 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4242 LSM_HOOK_INIT(syslog
, smack_syslog
),
4244 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4245 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4246 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4247 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4248 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4250 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4251 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4252 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4254 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4255 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4256 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4257 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4258 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4259 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4260 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4261 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4262 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4263 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4264 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4265 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4266 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4267 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4268 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4269 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4270 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4271 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4273 LSM_HOOK_INIT(file_permission
, smack_file_permission
),
4274 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4275 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4276 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4277 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4278 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4279 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4280 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4281 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4282 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4283 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4285 LSM_HOOK_INIT(file_open
, smack_file_open
),
4287 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4288 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4289 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4290 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4291 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4292 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4293 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4294 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4295 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4296 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4297 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4298 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4299 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4300 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4301 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4302 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4303 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4304 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4305 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4307 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4308 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4310 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4311 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4313 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4314 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4315 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4316 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4317 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4318 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4320 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4321 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4322 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4323 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4324 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4326 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4327 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4328 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4329 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4330 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4332 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4334 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4335 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4337 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4338 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4340 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4341 #ifndef CONFIG_SECURITY_SMACK_NETFILTER
4342 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4343 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4344 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4345 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4346 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4347 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4348 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4349 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4350 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4351 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4352 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4353 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4355 /* key management security hooks */
4357 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4358 LSM_HOOK_INIT(key_free
, smack_key_free
),
4359 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4360 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4361 #endif /* CONFIG_KEYS */
4365 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4366 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4367 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4368 LSM_HOOK_INIT(audit_rule_free
, smack_audit_rule_free
),
4369 #endif /* CONFIG_AUDIT */
4371 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4372 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4373 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4374 LSM_HOOK_INIT(release_secctx
, smack_release_secctx
),
4375 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4376 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4377 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4381 static __init
void init_smack_known_list(void)
4384 * Initialize rule list locks
4386 mutex_init(&smack_known_huh
.smk_rules_lock
);
4387 mutex_init(&smack_known_hat
.smk_rules_lock
);
4388 mutex_init(&smack_known_floor
.smk_rules_lock
);
4389 mutex_init(&smack_known_star
.smk_rules_lock
);
4390 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4391 mutex_init(&smack_known_web
.smk_rules_lock
);
4393 * Initialize rule lists
4395 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4396 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4397 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4398 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4399 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4400 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4402 * Create the known labels list
4404 smk_insert_entry(&smack_known_huh
);
4405 smk_insert_entry(&smack_known_hat
);
4406 smk_insert_entry(&smack_known_star
);
4407 smk_insert_entry(&smack_known_floor
);
4408 smk_insert_entry(&smack_known_invalid
);
4409 smk_insert_entry(&smack_known_web
);
4413 * smack_init - initialize the smack system
4417 static __init
int smack_init(void)
4420 struct task_smack
*tsp
;
4422 if (!security_module_enable("smack"))
4427 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4428 if (!smack_inode_cache
)
4431 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4434 kmem_cache_destroy(smack_inode_cache
);
4438 printk(KERN_INFO
"Smack: Initializing.\n");
4441 * Set the security state for the initial task.
4443 cred
= (struct cred
*) current
->cred
;
4444 cred
->security
= tsp
;
4446 /* initialize the smack_known_list */
4447 init_smack_known_list();
4452 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4458 * Smack requires early initialization in order to label
4459 * all processes and objects when they are created.
4461 security_initcall(smack_init
);