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 task_security(task) (task_cred_xxx((task), security))
48 #define TRANS_TRUE "TRUE"
49 #define TRANS_TRUE_SIZE 4
51 #define SMK_CONNECTING 0
52 #define SMK_RECEIVING 1
55 LIST_HEAD(smk_ipv6_port_list
);
58 * smk_fetch - Fetch the smack label from a file.
59 * @ip: a pointer to the inode
60 * @dp: a pointer to the dentry
62 * Returns a pointer to the master list entry for the Smack label
63 * or NULL if there was no label to fetch.
65 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
70 struct smack_known
*skp
= NULL
;
72 if (ip
->i_op
->getxattr
== NULL
)
75 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
79 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
81 skp
= smk_import_entry(buffer
, rc
);
89 * new_inode_smack - allocate an inode security blob
90 * @smack: a pointer to the Smack label to use in the blob
92 * Returns the new blob or NULL if there's no memory available
94 struct inode_smack
*new_inode_smack(char *smack
)
96 struct inode_smack
*isp
;
98 isp
= kzalloc(sizeof(struct inode_smack
), GFP_NOFS
);
102 isp
->smk_inode
= smack
;
104 mutex_init(&isp
->smk_lock
);
110 * new_task_smack - allocate a task security blob
111 * @smack: a pointer to the Smack label to use in the blob
113 * Returns the new blob or NULL if there's no memory available
115 static struct task_smack
*new_task_smack(struct smack_known
*task
,
116 struct smack_known
*forked
, gfp_t gfp
)
118 struct task_smack
*tsp
;
120 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
124 tsp
->smk_task
= task
;
125 tsp
->smk_forked
= forked
;
126 INIT_LIST_HEAD(&tsp
->smk_rules
);
127 mutex_init(&tsp
->smk_rules_lock
);
133 * smk_copy_rules - copy a rule set
134 * @nhead - new rules header pointer
135 * @ohead - old rules header pointer
137 * Returns 0 on success, -ENOMEM on error
139 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
142 struct smack_rule
*nrp
;
143 struct smack_rule
*orp
;
146 INIT_LIST_HEAD(nhead
);
148 list_for_each_entry_rcu(orp
, ohead
, list
) {
149 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
155 list_add_rcu(&nrp
->list
, nhead
);
162 * We he, that is fun!
166 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
167 * @ctp: child task pointer
168 * @mode: ptrace attachment mode
170 * Returns 0 if access is OK, an error code otherwise
172 * Do the capability checks, and require read and write.
174 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
177 struct smk_audit_info ad
;
178 struct smack_known
*skp
;
180 rc
= cap_ptrace_access_check(ctp
, mode
);
184 skp
= smk_of_task(task_security(ctp
));
185 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
186 smk_ad_setfield_u_tsk(&ad
, ctp
);
188 rc
= smk_curacc(skp
->smk_known
, mode
, &ad
);
193 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
194 * @ptp: parent task pointer
196 * Returns 0 if access is OK, an error code otherwise
198 * Do the capability checks, and require read and write.
200 static int smack_ptrace_traceme(struct task_struct
*ptp
)
203 struct smk_audit_info ad
;
204 struct smack_known
*skp
;
206 rc
= cap_ptrace_traceme(ptp
);
210 skp
= smk_of_task(task_security(ptp
));
211 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
212 smk_ad_setfield_u_tsk(&ad
, ptp
);
214 rc
= smk_curacc(skp
->smk_known
, MAY_READWRITE
, &ad
);
219 * smack_syslog - Smack approval on syslog
220 * @type: message type
222 * Require that the task has the floor label
224 * Returns 0 on success, error code otherwise.
226 static int smack_syslog(int typefrom_file
)
229 struct smack_known
*skp
= smk_of_current();
231 if (smack_privileged(CAP_MAC_OVERRIDE
))
234 if (skp
!= &smack_known_floor
)
246 * smack_sb_alloc_security - allocate a superblock blob
247 * @sb: the superblock getting the blob
249 * Returns 0 on success or -ENOMEM on error.
251 static int smack_sb_alloc_security(struct super_block
*sb
)
253 struct superblock_smack
*sbsp
;
255 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
260 sbsp
->smk_root
= smack_known_floor
.smk_known
;
261 sbsp
->smk_default
= smack_known_floor
.smk_known
;
262 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
263 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
265 * smk_initialized will be zero from kzalloc.
267 sb
->s_security
= sbsp
;
273 * smack_sb_free_security - free a superblock blob
274 * @sb: the superblock getting the blob
277 static void smack_sb_free_security(struct super_block
*sb
)
279 kfree(sb
->s_security
);
280 sb
->s_security
= NULL
;
284 * smack_sb_copy_data - copy mount options data for processing
285 * @orig: where to start
286 * @smackopts: mount options string
288 * Returns 0 on success or -ENOMEM on error.
290 * Copy the Smack specific mount options out of the mount
293 static int smack_sb_copy_data(char *orig
, char *smackopts
)
295 char *cp
, *commap
, *otheropts
, *dp
;
297 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
298 if (otheropts
== NULL
)
301 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
302 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
304 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
306 else if (strstr(cp
, SMK_FSHAT
) == cp
)
308 else if (strstr(cp
, SMK_FSROOT
) == cp
)
310 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
315 commap
= strchr(cp
, ',');
324 strcpy(orig
, otheropts
);
325 free_page((unsigned long)otheropts
);
331 * smack_sb_kern_mount - Smack specific mount processing
332 * @sb: the file system superblock
333 * @flags: the mount flags
334 * @data: the smack mount options
336 * Returns 0 on success, an error code on failure
338 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
340 struct dentry
*root
= sb
->s_root
;
341 struct inode
*inode
= root
->d_inode
;
342 struct superblock_smack
*sp
= sb
->s_security
;
343 struct inode_smack
*isp
;
349 if (sp
->smk_initialized
)
352 sp
->smk_initialized
= 1;
354 for (op
= data
; op
!= NULL
; op
= commap
) {
355 commap
= strchr(op
, ',');
359 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
360 op
+= strlen(SMK_FSHAT
);
361 nsp
= smk_import(op
, 0);
364 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
365 op
+= strlen(SMK_FSFLOOR
);
366 nsp
= smk_import(op
, 0);
369 } else if (strncmp(op
, SMK_FSDEFAULT
,
370 strlen(SMK_FSDEFAULT
)) == 0) {
371 op
+= strlen(SMK_FSDEFAULT
);
372 nsp
= smk_import(op
, 0);
374 sp
->smk_default
= nsp
;
375 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
376 op
+= strlen(SMK_FSROOT
);
377 nsp
= smk_import(op
, 0);
380 } else if (strncmp(op
, SMK_FSTRANS
, strlen(SMK_FSTRANS
)) == 0) {
381 op
+= strlen(SMK_FSTRANS
);
382 nsp
= smk_import(op
, 0);
391 * Initialize the root inode.
393 isp
= inode
->i_security
;
394 if (inode
->i_security
== NULL
) {
395 inode
->i_security
= new_inode_smack(sp
->smk_root
);
396 isp
= inode
->i_security
;
398 isp
->smk_inode
= sp
->smk_root
;
401 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
407 * smack_sb_statfs - Smack check on statfs
408 * @dentry: identifies the file system in question
410 * Returns 0 if current can read the floor of the filesystem,
411 * and error code otherwise
413 static int smack_sb_statfs(struct dentry
*dentry
)
415 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
417 struct smk_audit_info ad
;
419 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
420 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
422 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
427 * smack_sb_mount - Smack check for mounting
434 * Returns 0 if current can write the floor of the filesystem
435 * being mounted on, an error code otherwise.
437 static int smack_sb_mount(const char *dev_name
, struct path
*path
,
438 const char *type
, unsigned long flags
, void *data
)
440 struct superblock_smack
*sbp
= path
->dentry
->d_sb
->s_security
;
441 struct smk_audit_info ad
;
443 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
444 smk_ad_setfield_u_fs_path(&ad
, *path
);
446 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
450 * smack_sb_umount - Smack check for unmounting
451 * @mnt: file system to unmount
454 * Returns 0 if current can write the floor of the filesystem
455 * being unmounted, an error code otherwise.
457 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
459 struct superblock_smack
*sbp
;
460 struct smk_audit_info ad
;
463 path
.dentry
= mnt
->mnt_root
;
466 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
467 smk_ad_setfield_u_fs_path(&ad
, path
);
469 sbp
= path
.dentry
->d_sb
->s_security
;
470 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
478 * smack_bprm_set_creds - set creds for exec
479 * @bprm: the exec information
481 * Returns 0 if it gets a blob, -ENOMEM otherwise
483 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
485 struct inode
*inode
= file_inode(bprm
->file
);
486 struct task_smack
*bsp
= bprm
->cred
->security
;
487 struct inode_smack
*isp
;
490 rc
= cap_bprm_set_creds(bprm
);
494 if (bprm
->cred_prepared
)
497 isp
= inode
->i_security
;
498 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
504 bsp
->smk_task
= isp
->smk_task
;
505 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
511 * smack_bprm_committing_creds - Prepare to install the new credentials
514 * @bprm: binprm for exec
516 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
518 struct task_smack
*bsp
= bprm
->cred
->security
;
520 if (bsp
->smk_task
!= bsp
->smk_forked
)
521 current
->pdeath_signal
= 0;
525 * smack_bprm_secureexec - Return the decision to use secureexec.
526 * @bprm: binprm for exec
528 * Returns 0 on success.
530 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
532 struct task_smack
*tsp
= current_security();
533 int ret
= cap_bprm_secureexec(bprm
);
535 if (!ret
&& (tsp
->smk_task
!= tsp
->smk_forked
))
546 * smack_inode_alloc_security - allocate an inode blob
547 * @inode: the inode in need of a blob
549 * Returns 0 if it gets a blob, -ENOMEM otherwise
551 static int smack_inode_alloc_security(struct inode
*inode
)
553 struct smack_known
*skp
= smk_of_current();
555 inode
->i_security
= new_inode_smack(skp
->smk_known
);
556 if (inode
->i_security
== NULL
)
562 * smack_inode_free_security - free an inode blob
563 * @inode: the inode with a blob
565 * Clears the blob pointer in inode
567 static void smack_inode_free_security(struct inode
*inode
)
569 kfree(inode
->i_security
);
570 inode
->i_security
= NULL
;
574 * smack_inode_init_security - copy out the smack from an inode
578 * @name: where to put the attribute name
579 * @value: where to put the attribute value
580 * @len: where to put the length of the attribute
582 * Returns 0 if it all works out, -ENOMEM if there's no memory
584 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
585 const struct qstr
*qstr
, const char **name
,
586 void **value
, size_t *len
)
588 struct inode_smack
*issp
= inode
->i_security
;
589 struct smack_known
*skp
= smk_of_current();
590 char *isp
= smk_of_inode(inode
);
591 char *dsp
= smk_of_inode(dir
);
595 *name
= XATTR_SMACK_SUFFIX
;
599 may
= smk_access_entry(skp
->smk_known
, dsp
, &skp
->smk_rules
);
603 * If the access rule allows transmutation and
604 * the directory requests transmutation then
605 * by all means transmute.
606 * Mark the inode as changed.
608 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
609 smk_inode_transmutable(dir
)) {
611 issp
->smk_flags
|= SMK_INODE_CHANGED
;
614 *value
= kstrdup(isp
, GFP_NOFS
);
620 *len
= strlen(isp
) + 1;
626 * smack_inode_link - Smack check on link
627 * @old_dentry: the existing object
629 * @new_dentry: the new object
631 * Returns 0 if access is permitted, an error code otherwise
633 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
634 struct dentry
*new_dentry
)
637 struct smk_audit_info ad
;
640 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
641 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
643 isp
= smk_of_inode(old_dentry
->d_inode
);
644 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
646 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
647 isp
= smk_of_inode(new_dentry
->d_inode
);
648 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
649 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
656 * smack_inode_unlink - Smack check on inode deletion
657 * @dir: containing directory object
658 * @dentry: file to unlink
660 * Returns 0 if current can write the containing directory
661 * and the object, error code otherwise
663 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
665 struct inode
*ip
= dentry
->d_inode
;
666 struct smk_audit_info ad
;
669 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
670 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
673 * You need write access to the thing you're unlinking
675 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
678 * You also need write access to the containing directory
680 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
681 smk_ad_setfield_u_fs_inode(&ad
, dir
);
682 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
688 * smack_inode_rmdir - Smack check on directory deletion
689 * @dir: containing directory object
690 * @dentry: directory to unlink
692 * Returns 0 if current can write the containing directory
693 * and the directory, error code otherwise
695 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
697 struct smk_audit_info ad
;
700 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
701 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
704 * You need write access to the thing you're removing
706 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
709 * You also need write access to the containing directory
711 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
712 smk_ad_setfield_u_fs_inode(&ad
, dir
);
713 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
720 * smack_inode_rename - Smack check on rename
721 * @old_inode: the old directory
722 * @old_dentry: unused
723 * @new_inode: the new directory
724 * @new_dentry: unused
726 * Read and write access is required on both the old and
729 * Returns 0 if access is permitted, an error code otherwise
731 static int smack_inode_rename(struct inode
*old_inode
,
732 struct dentry
*old_dentry
,
733 struct inode
*new_inode
,
734 struct dentry
*new_dentry
)
738 struct smk_audit_info ad
;
740 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
741 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
743 isp
= smk_of_inode(old_dentry
->d_inode
);
744 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
746 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
747 isp
= smk_of_inode(new_dentry
->d_inode
);
748 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
749 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
755 * smack_inode_permission - Smack version of permission()
756 * @inode: the inode in question
757 * @mask: the access requested
759 * This is the important Smack hook.
761 * Returns 0 if access is permitted, -EACCES otherwise
763 static int smack_inode_permission(struct inode
*inode
, int mask
)
765 struct smk_audit_info ad
;
766 int no_block
= mask
& MAY_NOT_BLOCK
;
768 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
770 * No permission to check. Existence test. Yup, it's there.
775 /* May be droppable after audit */
778 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
779 smk_ad_setfield_u_fs_inode(&ad
, inode
);
780 return smk_curacc(smk_of_inode(inode
), mask
, &ad
);
784 * smack_inode_setattr - Smack check for setting attributes
785 * @dentry: the object
786 * @iattr: for the force flag
788 * Returns 0 if access is permitted, an error code otherwise
790 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
792 struct smk_audit_info ad
;
794 * Need to allow for clearing the setuid bit.
796 if (iattr
->ia_valid
& ATTR_FORCE
)
798 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
799 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
801 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
805 * smack_inode_getattr - Smack check for getting attributes
807 * @dentry: the object
809 * Returns 0 if access is permitted, an error code otherwise
811 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
813 struct smk_audit_info ad
;
816 path
.dentry
= dentry
;
819 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
820 smk_ad_setfield_u_fs_path(&ad
, path
);
821 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
825 * smack_inode_setxattr - Smack check for setting xattrs
826 * @dentry: the object
827 * @name: name of the attribute
832 * This protects the Smack attribute explicitly.
834 * Returns 0 if access is permitted, an error code otherwise
836 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
837 const void *value
, size_t size
, int flags
)
839 struct smk_audit_info ad
;
842 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
843 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
844 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
845 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
846 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
847 if (!smack_privileged(CAP_MAC_ADMIN
))
850 * check label validity here so import wont fail on
853 if (size
== 0 || size
>= SMK_LONGLABEL
||
854 smk_import(value
, size
) == NULL
)
856 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
857 if (!smack_privileged(CAP_MAC_ADMIN
))
859 if (size
!= TRANS_TRUE_SIZE
||
860 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
863 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
865 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
866 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
869 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
875 * smack_inode_post_setxattr - Apply the Smack update approved above
877 * @name: attribute name
878 * @value: attribute value
879 * @size: attribute size
882 * Set the pointer in the inode blob to the entry found
883 * in the master label list.
885 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
886 const void *value
, size_t size
, int flags
)
888 struct smack_known
*skp
;
889 struct inode_smack
*isp
= dentry
->d_inode
->i_security
;
891 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
892 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
896 skp
= smk_import_entry(value
, size
);
897 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
899 isp
->smk_inode
= skp
->smk_known
;
901 isp
->smk_inode
= smack_known_invalid
.smk_known
;
902 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
906 isp
->smk_task
= &smack_known_invalid
;
907 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
911 isp
->smk_mmap
= &smack_known_invalid
;
918 * smack_inode_getxattr - Smack check on getxattr
919 * @dentry: the object
922 * Returns 0 if access is permitted, an error code otherwise
924 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
926 struct smk_audit_info ad
;
928 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
929 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
931 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
935 * smack_inode_removexattr - Smack check on removexattr
936 * @dentry: the object
937 * @name: name of the attribute
939 * Removing the Smack attribute requires CAP_MAC_ADMIN
941 * Returns 0 if access is permitted, an error code otherwise
943 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
945 struct inode_smack
*isp
;
946 struct smk_audit_info ad
;
949 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
950 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
951 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
952 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
953 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
954 strcmp(name
, XATTR_NAME_SMACKMMAP
)) {
955 if (!smack_privileged(CAP_MAC_ADMIN
))
958 rc
= cap_inode_removexattr(dentry
, name
);
960 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
961 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
963 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
966 isp
= dentry
->d_inode
->i_security
;
967 isp
->smk_task
= NULL
;
968 isp
->smk_mmap
= NULL
;
975 * smack_inode_getsecurity - get smack xattrs
977 * @name: attribute name
978 * @buffer: where to put the result
981 * Returns the size of the attribute or an error code
983 static int smack_inode_getsecurity(const struct inode
*inode
,
984 const char *name
, void **buffer
,
987 struct socket_smack
*ssp
;
989 struct super_block
*sbp
;
990 struct inode
*ip
= (struct inode
*)inode
;
995 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
996 isp
= smk_of_inode(inode
);
997 ilen
= strlen(isp
) + 1;
1003 * The rest of the Smack xattrs are only on sockets.
1006 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1009 sock
= SOCKET_I(ip
);
1010 if (sock
== NULL
|| sock
->sk
== NULL
)
1013 ssp
= sock
->sk
->sk_security
;
1015 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1017 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1018 isp
= ssp
->smk_out
->smk_known
;
1022 ilen
= strlen(isp
) + 1;
1033 * smack_inode_listsecurity - list the Smack attributes
1034 * @inode: the object
1035 * @buffer: where they go
1036 * @buffer_size: size of buffer
1038 * Returns 0 on success, -EINVAL otherwise
1040 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1043 int len
= strlen(XATTR_NAME_SMACK
);
1045 if (buffer
!= NULL
&& len
<= buffer_size
) {
1046 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1053 * smack_inode_getsecid - Extract inode's security id
1054 * @inode: inode to extract the info from
1055 * @secid: where result will be saved
1057 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1059 struct inode_smack
*isp
= inode
->i_security
;
1061 *secid
= smack_to_secid(isp
->smk_inode
);
1069 * smack_file_permission - Smack check on file operations
1075 * Should access checks be done on each read or write?
1076 * UNICOS and SELinux say yes.
1077 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1079 * I'll say no for now. Smack does not do the frequent
1080 * label changing that SELinux does.
1082 static int smack_file_permission(struct file
*file
, int mask
)
1088 * smack_file_alloc_security - assign a file security blob
1091 * The security blob for a file is a pointer to the master
1092 * label list, so no allocation is done.
1096 static int smack_file_alloc_security(struct file
*file
)
1098 struct smack_known
*skp
= smk_of_current();
1100 file
->f_security
= skp
->smk_known
;
1105 * smack_file_free_security - clear a file security blob
1108 * The security blob for a file is a pointer to the master
1109 * label list, so no memory is freed.
1111 static void smack_file_free_security(struct file
*file
)
1113 file
->f_security
= NULL
;
1117 * smack_file_ioctl - Smack check on ioctls
1122 * Relies heavily on the correct use of the ioctl command conventions.
1124 * Returns 0 if allowed, error code otherwise
1126 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1130 struct smk_audit_info ad
;
1132 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1133 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1135 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
1136 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1138 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
1139 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1145 * smack_file_lock - Smack check on file locking
1149 * Returns 0 if current has lock access, error code otherwise
1151 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1153 struct smk_audit_info ad
;
1155 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1156 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1157 return smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1161 * smack_file_fcntl - Smack check on fcntl
1163 * @cmd: what action to check
1166 * Generally these operations are harmless.
1167 * File locking operations present an obvious mechanism
1168 * for passing information, so they require write access.
1170 * Returns 0 if current has access, error code otherwise
1172 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1175 struct smk_audit_info ad
;
1184 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1185 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1186 rc
= smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1190 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1191 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1192 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1203 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1204 * if mapping anonymous memory.
1205 * @file contains the file structure for file to map (may be NULL).
1206 * @reqprot contains the protection requested by the application.
1207 * @prot contains the protection that will be applied by the kernel.
1208 * @flags contains the operational flags.
1209 * Return 0 if permission is granted.
1211 static int smack_mmap_file(struct file
*file
,
1212 unsigned long reqprot
, unsigned long prot
,
1213 unsigned long flags
)
1215 struct smack_known
*skp
;
1216 struct smack_known
*mkp
;
1217 struct smack_rule
*srp
;
1218 struct task_smack
*tsp
;
1220 struct inode_smack
*isp
;
1229 isp
= file_inode(file
)->i_security
;
1230 if (isp
->smk_mmap
== NULL
)
1232 mkp
= isp
->smk_mmap
;
1234 tsp
= current_security();
1235 skp
= smk_of_current();
1240 * For each Smack rule associated with the subject
1241 * label verify that the SMACK64MMAP also has access
1242 * to that rule's object label.
1244 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1245 osmack
= srp
->smk_object
;
1247 * Matching labels always allows access.
1249 if (mkp
->smk_known
== osmack
)
1252 * If there is a matching local rule take
1253 * that into account as well.
1255 may
= smk_access_entry(srp
->smk_subject
->smk_known
, osmack
,
1258 may
= srp
->smk_access
;
1260 may
&= srp
->smk_access
;
1262 * If may is zero the SMACK64MMAP subject can't
1263 * possibly have less access.
1269 * Fetch the global list entry.
1270 * If there isn't one a SMACK64MMAP subject
1271 * can't have as much access as current.
1273 mmay
= smk_access_entry(mkp
->smk_known
, osmack
,
1275 if (mmay
== -ENOENT
) {
1280 * If there is a local entry it modifies the
1281 * potential access, too.
1283 tmay
= smk_access_entry(mkp
->smk_known
, osmack
,
1285 if (tmay
!= -ENOENT
)
1289 * If there is any access available to current that is
1290 * not available to a SMACK64MMAP subject
1293 if ((may
| mmay
) != mmay
) {
1305 * smack_file_set_fowner - set the file security blob value
1306 * @file: object in question
1309 * Further research may be required on this one.
1311 static int smack_file_set_fowner(struct file
*file
)
1313 struct smack_known
*skp
= smk_of_current();
1315 file
->f_security
= skp
->smk_known
;
1320 * smack_file_send_sigiotask - Smack on sigio
1321 * @tsk: The target task
1322 * @fown: the object the signal come from
1325 * Allow a privileged task to get signals even if it shouldn't
1327 * Returns 0 if a subject with the object's smack could
1328 * write to the task, an error code otherwise.
1330 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1331 struct fown_struct
*fown
, int signum
)
1333 struct smack_known
*skp
;
1334 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1337 struct smk_audit_info ad
;
1340 * struct fown_struct is never outside the context of a struct file
1342 file
= container_of(fown
, struct file
, f_owner
);
1344 /* we don't log here as rc can be overriden */
1345 skp
= smk_find_entry(file
->f_security
);
1346 rc
= smk_access(skp
, tkp
->smk_known
, MAY_WRITE
, NULL
);
1347 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1350 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1351 smk_ad_setfield_u_tsk(&ad
, tsk
);
1352 smack_log(file
->f_security
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1357 * smack_file_receive - Smack file receive check
1360 * Returns 0 if current has access, error code otherwise
1362 static int smack_file_receive(struct file
*file
)
1365 struct smk_audit_info ad
;
1367 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1368 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1370 * This code relies on bitmasks.
1372 if (file
->f_mode
& FMODE_READ
)
1374 if (file
->f_mode
& FMODE_WRITE
)
1377 return smk_curacc(file
->f_security
, may
, &ad
);
1381 * smack_file_open - Smack dentry open processing
1385 * Set the security blob in the file structure.
1389 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1391 struct inode_smack
*isp
= file_inode(file
)->i_security
;
1393 file
->f_security
= isp
->smk_inode
;
1403 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1404 * @new: the new credentials
1405 * @gfp: the atomicity of any memory allocations
1407 * Prepare a blank set of credentials for modification. This must allocate all
1408 * the memory the LSM module might require such that cred_transfer() can
1409 * complete without error.
1411 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1413 struct task_smack
*tsp
;
1415 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1419 cred
->security
= tsp
;
1426 * smack_cred_free - "free" task-level security credentials
1427 * @cred: the credentials in question
1430 static void smack_cred_free(struct cred
*cred
)
1432 struct task_smack
*tsp
= cred
->security
;
1433 struct smack_rule
*rp
;
1434 struct list_head
*l
;
1435 struct list_head
*n
;
1439 cred
->security
= NULL
;
1441 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1442 rp
= list_entry(l
, struct smack_rule
, list
);
1443 list_del(&rp
->list
);
1450 * smack_cred_prepare - prepare new set of credentials for modification
1451 * @new: the new credentials
1452 * @old: the original credentials
1453 * @gfp: the atomicity of any memory allocations
1455 * Prepare a new set of credentials for modification.
1457 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1460 struct task_smack
*old_tsp
= old
->security
;
1461 struct task_smack
*new_tsp
;
1464 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1465 if (new_tsp
== NULL
)
1468 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1472 new->security
= new_tsp
;
1477 * smack_cred_transfer - Transfer the old credentials to the new credentials
1478 * @new: the new credentials
1479 * @old: the original credentials
1481 * Fill in a set of blank credentials from another set of credentials.
1483 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1485 struct task_smack
*old_tsp
= old
->security
;
1486 struct task_smack
*new_tsp
= new->security
;
1488 new_tsp
->smk_task
= old_tsp
->smk_task
;
1489 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1490 mutex_init(&new_tsp
->smk_rules_lock
);
1491 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1494 /* cbs copy rule list */
1498 * smack_kernel_act_as - Set the subjective context in a set of credentials
1499 * @new: points to the set of credentials to be modified.
1500 * @secid: specifies the security ID to be set
1502 * Set the security data for a kernel service.
1504 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1506 struct task_smack
*new_tsp
= new->security
;
1507 struct smack_known
*skp
= smack_from_secid(secid
);
1512 new_tsp
->smk_task
= skp
;
1517 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1518 * @new: points to the set of credentials to be modified
1519 * @inode: points to the inode to use as a reference
1521 * Set the file creation context in a set of credentials to the same
1522 * as the objective context of the specified inode
1524 static int smack_kernel_create_files_as(struct cred
*new,
1525 struct inode
*inode
)
1527 struct inode_smack
*isp
= inode
->i_security
;
1528 struct task_smack
*tsp
= new->security
;
1530 tsp
->smk_forked
= smk_find_entry(isp
->smk_inode
);
1531 tsp
->smk_task
= tsp
->smk_forked
;
1536 * smk_curacc_on_task - helper to log task related access
1537 * @p: the task object
1538 * @access: the access requested
1539 * @caller: name of the calling function for audit
1541 * Return 0 if access is permitted
1543 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
1546 struct smk_audit_info ad
;
1547 struct smack_known
*skp
= smk_of_task(task_security(p
));
1549 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
1550 smk_ad_setfield_u_tsk(&ad
, p
);
1551 return smk_curacc(skp
->smk_known
, access
, &ad
);
1555 * smack_task_setpgid - Smack check on setting pgid
1556 * @p: the task object
1559 * Return 0 if write access is permitted
1561 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1563 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1567 * smack_task_getpgid - Smack access check for getpgid
1568 * @p: the object task
1570 * Returns 0 if current can read the object task, error code otherwise
1572 static int smack_task_getpgid(struct task_struct
*p
)
1574 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1578 * smack_task_getsid - Smack access check for getsid
1579 * @p: the object task
1581 * Returns 0 if current can read the object task, error code otherwise
1583 static int smack_task_getsid(struct task_struct
*p
)
1585 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1589 * smack_task_getsecid - get the secid of the task
1590 * @p: the object task
1591 * @secid: where to put the result
1593 * Sets the secid to contain a u32 version of the smack label.
1595 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1597 struct smack_known
*skp
= smk_of_task(task_security(p
));
1599 *secid
= skp
->smk_secid
;
1603 * smack_task_setnice - Smack check on setting nice
1604 * @p: the task object
1607 * Return 0 if write access is permitted
1609 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1613 rc
= cap_task_setnice(p
, nice
);
1615 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1620 * smack_task_setioprio - Smack check on setting ioprio
1621 * @p: the task object
1624 * Return 0 if write access is permitted
1626 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1630 rc
= cap_task_setioprio(p
, ioprio
);
1632 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1637 * smack_task_getioprio - Smack check on reading ioprio
1638 * @p: the task object
1640 * Return 0 if read access is permitted
1642 static int smack_task_getioprio(struct task_struct
*p
)
1644 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1648 * smack_task_setscheduler - Smack check on setting scheduler
1649 * @p: the task object
1653 * Return 0 if read access is permitted
1655 static int smack_task_setscheduler(struct task_struct
*p
)
1659 rc
= cap_task_setscheduler(p
);
1661 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1666 * smack_task_getscheduler - Smack check on reading scheduler
1667 * @p: the task object
1669 * Return 0 if read access is permitted
1671 static int smack_task_getscheduler(struct task_struct
*p
)
1673 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1677 * smack_task_movememory - Smack check on moving memory
1678 * @p: the task object
1680 * Return 0 if write access is permitted
1682 static int smack_task_movememory(struct task_struct
*p
)
1684 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1688 * smack_task_kill - Smack check on signal delivery
1689 * @p: the task object
1692 * @secid: identifies the smack to use in lieu of current's
1694 * Return 0 if write access is permitted
1696 * The secid behavior is an artifact of an SELinux hack
1697 * in the USB code. Someday it may go away.
1699 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1702 struct smk_audit_info ad
;
1703 struct smack_known
*skp
;
1704 struct smack_known
*tkp
= smk_of_task(task_security(p
));
1706 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1707 smk_ad_setfield_u_tsk(&ad
, p
);
1709 * Sending a signal requires that the sender
1710 * can write the receiver.
1713 return smk_curacc(tkp
->smk_known
, MAY_WRITE
, &ad
);
1715 * If the secid isn't 0 we're dealing with some USB IO
1716 * specific behavior. This is not clean. For one thing
1717 * we can't take privilege into account.
1719 skp
= smack_from_secid(secid
);
1720 return smk_access(skp
, tkp
->smk_known
, MAY_WRITE
, &ad
);
1724 * smack_task_wait - Smack access check for waiting
1725 * @p: task to wait for
1729 static int smack_task_wait(struct task_struct
*p
)
1732 * Allow the operation to succeed.
1734 * In userless environments (e.g. phones) programs
1735 * get marked with SMACK64EXEC and even if the parent
1736 * and child shouldn't be talking the parent still
1737 * may expect to know when the child exits.
1743 * smack_task_to_inode - copy task smack into the inode blob
1744 * @p: task to copy from
1745 * @inode: inode to copy to
1747 * Sets the smack pointer in the inode security blob
1749 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1751 struct inode_smack
*isp
= inode
->i_security
;
1752 struct smack_known
*skp
= smk_of_task(task_security(p
));
1754 isp
->smk_inode
= skp
->smk_known
;
1762 * smack_sk_alloc_security - Allocate a socket blob
1765 * @gfp_flags: memory allocation flags
1767 * Assign Smack pointers to current
1769 * Returns 0 on success, -ENOMEM is there's no memory
1771 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1773 struct smack_known
*skp
= smk_of_current();
1774 struct socket_smack
*ssp
;
1776 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1780 ssp
->smk_in
= skp
->smk_known
;
1782 ssp
->smk_packet
= NULL
;
1784 sk
->sk_security
= ssp
;
1790 * smack_sk_free_security - Free a socket blob
1793 * Clears the blob pointer
1795 static void smack_sk_free_security(struct sock
*sk
)
1797 kfree(sk
->sk_security
);
1801 * smack_host_label - check host based restrictions
1802 * @sip: the object end
1804 * looks for host based access restrictions
1806 * This version will only be appropriate for really small sets of single label
1807 * hosts. The caller is responsible for ensuring that the RCU read lock is
1808 * taken before calling this function.
1810 * Returns the label of the far end or NULL if it's not special.
1812 static char *smack_host_label(struct sockaddr_in
*sip
)
1814 struct smk_netlbladdr
*snp
;
1815 struct in_addr
*siap
= &sip
->sin_addr
;
1817 if (siap
->s_addr
== 0)
1820 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
1822 * we break after finding the first match because
1823 * the list is sorted from longest to shortest mask
1824 * so we have found the most specific match
1826 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1827 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1828 /* we have found the special CIPSO option */
1829 if (snp
->smk_label
== smack_cipso_option
)
1831 return snp
->smk_label
;
1838 * smack_netlabel - Set the secattr on a socket
1840 * @labeled: socket label scheme
1842 * Convert the outbound smack value (smk_out) to a
1843 * secattr and attach it to the socket.
1845 * Returns 0 on success or an error code
1847 static int smack_netlabel(struct sock
*sk
, int labeled
)
1849 struct smack_known
*skp
;
1850 struct socket_smack
*ssp
= sk
->sk_security
;
1854 * Usually the netlabel code will handle changing the
1855 * packet labeling based on the label.
1856 * The case of a single label host is different, because
1857 * a single label host should never get a labeled packet
1858 * even though the label is usually associated with a packet
1862 bh_lock_sock_nested(sk
);
1864 if (ssp
->smk_out
== smack_net_ambient
||
1865 labeled
== SMACK_UNLABELED_SOCKET
)
1866 netlbl_sock_delattr(sk
);
1869 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
1879 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1881 * @sap: the destination address
1883 * Set the correct secattr for the given socket based on the destination
1884 * address and perform any outbound access checks needed.
1886 * Returns 0 on success or an error code.
1889 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
1891 struct smack_known
*skp
;
1895 struct socket_smack
*ssp
= sk
->sk_security
;
1896 struct smk_audit_info ad
;
1899 hostsp
= smack_host_label(sap
);
1900 if (hostsp
!= NULL
) {
1902 struct lsm_network_audit net
;
1904 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
1905 ad
.a
.u
.net
->family
= sap
->sin_family
;
1906 ad
.a
.u
.net
->dport
= sap
->sin_port
;
1907 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
1909 sk_lbl
= SMACK_UNLABELED_SOCKET
;
1911 rc
= smk_access(skp
, hostsp
, MAY_WRITE
, &ad
);
1913 sk_lbl
= SMACK_CIPSO_SOCKET
;
1920 return smack_netlabel(sk
, sk_lbl
);
1924 * smk_ipv6_port_label - Smack port access table management
1928 * Create or update the port list entry
1930 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
1932 struct sock
*sk
= sock
->sk
;
1933 struct sockaddr_in6
*addr6
;
1934 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
1935 struct smk_port_label
*spp
;
1936 unsigned short port
= 0;
1938 if (address
== NULL
) {
1940 * This operation is changing the Smack information
1941 * on the bound socket. Take the changes to the port
1944 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
1945 if (sk
!= spp
->smk_sock
)
1947 spp
->smk_in
= ssp
->smk_in
;
1948 spp
->smk_out
= ssp
->smk_out
;
1952 * A NULL address is only used for updating existing
1953 * bound entries. If there isn't one, it's OK.
1958 addr6
= (struct sockaddr_in6
*)address
;
1959 port
= ntohs(addr6
->sin6_port
);
1961 * This is a special case that is safely ignored.
1967 * Look for an existing port list entry.
1968 * This is an indication that a port is getting reused.
1970 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
1971 if (spp
->smk_port
!= port
)
1973 spp
->smk_port
= port
;
1975 spp
->smk_in
= ssp
->smk_in
;
1976 spp
->smk_out
= ssp
->smk_out
;
1981 * A new port entry is required.
1983 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
1987 spp
->smk_port
= port
;
1989 spp
->smk_in
= ssp
->smk_in
;
1990 spp
->smk_out
= ssp
->smk_out
;
1992 list_add(&spp
->list
, &smk_ipv6_port_list
);
1997 * smk_ipv6_port_check - check Smack port access
2001 * Create or update the port list entry
2003 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2008 struct smk_port_label
*spp
;
2009 struct socket_smack
*ssp
= sk
->sk_security
;
2010 struct smack_known
*skp
;
2011 unsigned short port
= 0;
2013 struct smk_audit_info ad
;
2015 struct lsm_network_audit net
;
2018 if (act
== SMK_RECEIVING
) {
2019 skp
= smack_net_ambient
;
2020 object
= ssp
->smk_in
;
2023 object
= smack_net_ambient
->smk_known
;
2027 * Get the IP address and port from the address.
2029 port
= ntohs(address
->sin6_port
);
2030 bep
= (__be16
*)(&address
->sin6_addr
);
2031 be32p
= (__be32
*)(&address
->sin6_addr
);
2034 * It's remote, so port lookup does no good.
2036 if (be32p
[0] || be32p
[1] || be32p
[2] || bep
[6] || ntohs(bep
[7]) != 1)
2040 * It's local so the send check has to have passed.
2042 if (act
== SMK_RECEIVING
) {
2043 skp
= &smack_known_web
;
2047 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2048 if (spp
->smk_port
!= port
)
2050 object
= spp
->smk_in
;
2051 if (act
== SMK_CONNECTING
)
2052 ssp
->smk_packet
= spp
->smk_out
->smk_known
;
2059 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2060 ad
.a
.u
.net
->family
= sk
->sk_family
;
2061 ad
.a
.u
.net
->dport
= port
;
2062 if (act
== SMK_RECEIVING
)
2063 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2065 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2067 return smk_access(skp
, object
, MAY_WRITE
, &ad
);
2071 * smack_inode_setsecurity - set smack xattrs
2072 * @inode: the object
2073 * @name: attribute name
2074 * @value: attribute value
2075 * @size: size of the attribute
2078 * Sets the named attribute in the appropriate blob
2080 * Returns 0 on success, or an error code
2082 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2083 const void *value
, size_t size
, int flags
)
2085 struct smack_known
*skp
;
2086 struct inode_smack
*nsp
= inode
->i_security
;
2087 struct socket_smack
*ssp
;
2088 struct socket
*sock
;
2091 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2094 skp
= smk_import_entry(value
, size
);
2098 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2099 nsp
->smk_inode
= skp
->smk_known
;
2100 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2104 * The rest of the Smack xattrs are only on sockets.
2106 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2109 sock
= SOCKET_I(inode
);
2110 if (sock
== NULL
|| sock
->sk
== NULL
)
2113 ssp
= sock
->sk
->sk_security
;
2115 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2116 ssp
->smk_in
= skp
->smk_known
;
2117 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2119 if (sock
->sk
->sk_family
== PF_INET
) {
2120 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2123 "Smack: \"%s\" netlbl error %d.\n",
2129 if (sock
->sk
->sk_family
== PF_INET6
)
2130 smk_ipv6_port_label(sock
, NULL
);
2136 * smack_socket_post_create - finish socket setup
2138 * @family: protocol family
2143 * Sets the netlabel information on the socket
2145 * Returns 0 on success, and error code otherwise
2147 static int smack_socket_post_create(struct socket
*sock
, int family
,
2148 int type
, int protocol
, int kern
)
2150 if (family
!= PF_INET
|| sock
->sk
== NULL
)
2153 * Set the outbound netlbl.
2155 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2159 * smack_socket_bind - record port binding information.
2161 * @address: the port address
2162 * @addrlen: size of the address
2164 * Records the label bound to a port.
2168 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2171 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2172 smk_ipv6_port_label(sock
, address
);
2178 * smack_socket_connect - connect access check
2180 * @sap: the other end
2181 * @addrlen: size of sap
2183 * Verifies that a connection may be possible
2185 * Returns 0 on success, and error code otherwise
2187 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2192 if (sock
->sk
== NULL
)
2195 switch (sock
->sk
->sk_family
) {
2197 if (addrlen
< sizeof(struct sockaddr_in
))
2199 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2202 if (addrlen
< sizeof(struct sockaddr_in6
))
2204 rc
= smk_ipv6_port_check(sock
->sk
, (struct sockaddr_in6
*)sap
,
2212 * smack_flags_to_may - convert S_ to MAY_ values
2213 * @flags: the S_ value
2215 * Returns the equivalent MAY_ value
2217 static int smack_flags_to_may(int flags
)
2221 if (flags
& S_IRUGO
)
2223 if (flags
& S_IWUGO
)
2225 if (flags
& S_IXUGO
)
2232 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2237 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2239 struct smack_known
*skp
= smk_of_current();
2241 msg
->security
= skp
->smk_known
;
2246 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2249 * Clears the blob pointer
2251 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2253 msg
->security
= NULL
;
2257 * smack_of_shm - the smack pointer for the shm
2260 * Returns a pointer to the smack value
2262 static char *smack_of_shm(struct shmid_kernel
*shp
)
2264 return (char *)shp
->shm_perm
.security
;
2268 * smack_shm_alloc_security - Set the security blob for shm
2273 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2275 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2276 struct smack_known
*skp
= smk_of_current();
2278 isp
->security
= skp
->smk_known
;
2283 * smack_shm_free_security - Clear the security blob for shm
2286 * Clears the blob pointer
2288 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2290 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2292 isp
->security
= NULL
;
2296 * smk_curacc_shm : check if current has access on shm
2298 * @access : access requested
2300 * Returns 0 if current has the requested access, error code otherwise
2302 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2304 char *ssp
= smack_of_shm(shp
);
2305 struct smk_audit_info ad
;
2308 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2309 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2311 return smk_curacc(ssp
, access
, &ad
);
2315 * smack_shm_associate - Smack access check for shm
2317 * @shmflg: access requested
2319 * Returns 0 if current has the requested access, error code otherwise
2321 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2325 may
= smack_flags_to_may(shmflg
);
2326 return smk_curacc_shm(shp
, may
);
2330 * smack_shm_shmctl - Smack access check for shm
2332 * @cmd: what it wants to do
2334 * Returns 0 if current has the requested access, error code otherwise
2336 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2349 may
= MAY_READWRITE
;
2354 * System level information.
2360 return smk_curacc_shm(shp
, may
);
2364 * smack_shm_shmat - Smack access for shmat
2367 * @shmflg: access requested
2369 * Returns 0 if current has the requested access, error code otherwise
2371 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2376 may
= smack_flags_to_may(shmflg
);
2377 return smk_curacc_shm(shp
, may
);
2381 * smack_of_sem - the smack pointer for the sem
2384 * Returns a pointer to the smack value
2386 static char *smack_of_sem(struct sem_array
*sma
)
2388 return (char *)sma
->sem_perm
.security
;
2392 * smack_sem_alloc_security - Set the security blob for sem
2397 static int smack_sem_alloc_security(struct sem_array
*sma
)
2399 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2400 struct smack_known
*skp
= smk_of_current();
2402 isp
->security
= skp
->smk_known
;
2407 * smack_sem_free_security - Clear the security blob for sem
2410 * Clears the blob pointer
2412 static void smack_sem_free_security(struct sem_array
*sma
)
2414 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2416 isp
->security
= NULL
;
2420 * smk_curacc_sem : check if current has access on sem
2422 * @access : access requested
2424 * Returns 0 if current has the requested access, error code otherwise
2426 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2428 char *ssp
= smack_of_sem(sma
);
2429 struct smk_audit_info ad
;
2432 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2433 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2435 return smk_curacc(ssp
, access
, &ad
);
2439 * smack_sem_associate - Smack access check for sem
2441 * @semflg: access requested
2443 * Returns 0 if current has the requested access, error code otherwise
2445 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2449 may
= smack_flags_to_may(semflg
);
2450 return smk_curacc_sem(sma
, may
);
2454 * smack_sem_shmctl - Smack access check for sem
2456 * @cmd: what it wants to do
2458 * Returns 0 if current has the requested access, error code otherwise
2460 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2478 may
= MAY_READWRITE
;
2483 * System level information
2490 return smk_curacc_sem(sma
, may
);
2494 * smack_sem_semop - Smack checks of semaphore operations
2500 * Treated as read and write in all cases.
2502 * Returns 0 if access is allowed, error code otherwise
2504 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2505 unsigned nsops
, int alter
)
2507 return smk_curacc_sem(sma
, MAY_READWRITE
);
2511 * smack_msg_alloc_security - Set the security blob for msg
2516 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2518 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2519 struct smack_known
*skp
= smk_of_current();
2521 kisp
->security
= skp
->smk_known
;
2526 * smack_msg_free_security - Clear the security blob for msg
2529 * Clears the blob pointer
2531 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2533 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2535 kisp
->security
= NULL
;
2539 * smack_of_msq - the smack pointer for the msq
2542 * Returns a pointer to the smack value
2544 static char *smack_of_msq(struct msg_queue
*msq
)
2546 return (char *)msq
->q_perm
.security
;
2550 * smk_curacc_msq : helper to check if current has access on msq
2552 * @access : access requested
2554 * return 0 if current has access, error otherwise
2556 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2558 char *msp
= smack_of_msq(msq
);
2559 struct smk_audit_info ad
;
2562 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2563 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2565 return smk_curacc(msp
, access
, &ad
);
2569 * smack_msg_queue_associate - Smack access check for msg_queue
2571 * @msqflg: access requested
2573 * Returns 0 if current has the requested access, error code otherwise
2575 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2579 may
= smack_flags_to_may(msqflg
);
2580 return smk_curacc_msq(msq
, may
);
2584 * smack_msg_queue_msgctl - Smack access check for msg_queue
2586 * @cmd: what it wants to do
2588 * Returns 0 if current has the requested access, error code otherwise
2590 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2601 may
= MAY_READWRITE
;
2606 * System level information
2613 return smk_curacc_msq(msq
, may
);
2617 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2620 * @msqflg: access requested
2622 * Returns 0 if current has the requested access, error code otherwise
2624 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2629 may
= smack_flags_to_may(msqflg
);
2630 return smk_curacc_msq(msq
, may
);
2634 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2641 * Returns 0 if current has read and write access, error code otherwise
2643 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2644 struct task_struct
*target
, long type
, int mode
)
2646 return smk_curacc_msq(msq
, MAY_READWRITE
);
2650 * smack_ipc_permission - Smack access for ipc_permission()
2651 * @ipp: the object permissions
2652 * @flag: access requested
2654 * Returns 0 if current has read and write access, error code otherwise
2656 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2658 char *isp
= ipp
->security
;
2659 int may
= smack_flags_to_may(flag
);
2660 struct smk_audit_info ad
;
2663 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2664 ad
.a
.u
.ipc_id
= ipp
->id
;
2666 return smk_curacc(isp
, may
, &ad
);
2670 * smack_ipc_getsecid - Extract smack security id
2671 * @ipp: the object permissions
2672 * @secid: where result will be saved
2674 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2676 char *smack
= ipp
->security
;
2678 *secid
= smack_to_secid(smack
);
2682 * smack_d_instantiate - Make sure the blob is correct on an inode
2683 * @opt_dentry: dentry where inode will be attached
2684 * @inode: the object
2686 * Set the inode's security blob if it hasn't been done already.
2688 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2690 struct super_block
*sbp
;
2691 struct superblock_smack
*sbsp
;
2692 struct inode_smack
*isp
;
2693 struct smack_known
*skp
;
2694 struct smack_known
*ckp
= smk_of_current();
2696 char trattr
[TRANS_TRUE_SIZE
];
2704 isp
= inode
->i_security
;
2706 mutex_lock(&isp
->smk_lock
);
2708 * If the inode is already instantiated
2709 * take the quick way out
2711 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2715 sbsp
= sbp
->s_security
;
2717 * We're going to use the superblock default label
2718 * if there's no label on the file.
2720 final
= sbsp
->smk_default
;
2723 * If this is the root inode the superblock
2724 * may be in the process of initialization.
2725 * If that is the case use the root value out
2726 * of the superblock.
2728 if (opt_dentry
->d_parent
== opt_dentry
) {
2729 isp
->smk_inode
= sbsp
->smk_root
;
2730 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2735 * This is pretty hackish.
2736 * Casey says that we shouldn't have to do
2737 * file system specific code, but it does help
2738 * with keeping it simple.
2740 switch (sbp
->s_magic
) {
2743 * Casey says that it's a little embarrassing
2744 * that the smack file system doesn't do
2745 * extended attributes.
2747 final
= smack_known_star
.smk_known
;
2751 * Casey says pipes are easy (?)
2753 final
= smack_known_star
.smk_known
;
2755 case DEVPTS_SUPER_MAGIC
:
2757 * devpts seems content with the label of the task.
2758 * Programs that change smack have to treat the
2761 final
= ckp
->smk_known
;
2765 * Socket access is controlled by the socket
2766 * structures associated with the task involved.
2768 final
= smack_known_star
.smk_known
;
2770 case PROC_SUPER_MAGIC
:
2772 * Casey says procfs appears not to care.
2773 * The superblock default suffices.
2778 * Device labels should come from the filesystem,
2779 * but watch out, because they're volitile,
2780 * getting recreated on every reboot.
2782 final
= smack_known_star
.smk_known
;
2786 * If a smack value has been set we want to use it,
2787 * but since tmpfs isn't giving us the opportunity
2788 * to set mount options simulate setting the
2789 * superblock default.
2793 * This isn't an understood special case.
2794 * Get the value from the xattr.
2798 * UNIX domain sockets use lower level socket data.
2800 if (S_ISSOCK(inode
->i_mode
)) {
2801 final
= smack_known_star
.smk_known
;
2805 * No xattr support means, alas, no SMACK label.
2806 * Use the aforeapplied default.
2807 * It would be curious if the label of the task
2808 * does not match that assigned.
2810 if (inode
->i_op
->getxattr
== NULL
)
2813 * Get the dentry for xattr.
2815 dp
= dget(opt_dentry
);
2816 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
2818 final
= skp
->smk_known
;
2821 * Transmuting directory
2823 if (S_ISDIR(inode
->i_mode
)) {
2825 * If this is a new directory and the label was
2826 * transmuted when the inode was initialized
2827 * set the transmute attribute on the directory
2828 * and mark the inode.
2830 * If there is a transmute attribute on the
2831 * directory mark the inode.
2833 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
2834 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
2835 rc
= inode
->i_op
->setxattr(dp
,
2836 XATTR_NAME_SMACKTRANSMUTE
,
2837 TRANS_TRUE
, TRANS_TRUE_SIZE
,
2840 rc
= inode
->i_op
->getxattr(dp
,
2841 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
2843 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
2844 TRANS_TRUE_SIZE
) != 0)
2848 transflag
= SMK_INODE_TRANSMUTE
;
2850 isp
->smk_task
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
2851 isp
->smk_mmap
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
2858 isp
->smk_inode
= ckp
->smk_known
;
2860 isp
->smk_inode
= final
;
2862 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
2865 mutex_unlock(&isp
->smk_lock
);
2870 * smack_getprocattr - Smack process attribute access
2871 * @p: the object task
2872 * @name: the name of the attribute in /proc/.../attr
2873 * @value: where to put the result
2875 * Places a copy of the task Smack into value
2877 * Returns the length of the smack label or an error code
2879 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2881 struct smack_known
*skp
= smk_of_task(task_security(p
));
2885 if (strcmp(name
, "current") != 0)
2888 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
2898 * smack_setprocattr - Smack process attribute setting
2899 * @p: the object task
2900 * @name: the name of the attribute in /proc/.../attr
2901 * @value: the value to set
2902 * @size: the size of the value
2904 * Sets the Smack value of the task. Only setting self
2905 * is permitted and only with privilege
2907 * Returns the length of the smack label or an error code
2909 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2910 void *value
, size_t size
)
2912 struct task_smack
*tsp
;
2914 struct smack_known
*skp
;
2917 * Changing another process' Smack value is too dangerous
2918 * and supports no sane use case.
2923 if (!smack_privileged(CAP_MAC_ADMIN
))
2926 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
2929 if (strcmp(name
, "current") != 0)
2932 skp
= smk_import_entry(value
, size
);
2937 * No process is ever allowed the web ("@") label.
2939 if (skp
== &smack_known_web
)
2942 new = prepare_creds();
2946 tsp
= new->security
;
2947 tsp
->smk_task
= skp
;
2954 * smack_unix_stream_connect - Smack access on UDS
2956 * @other: the other sock
2959 * Return 0 if a subject with the smack of sock could access
2960 * an object with the smack of other, otherwise an error code
2962 static int smack_unix_stream_connect(struct sock
*sock
,
2963 struct sock
*other
, struct sock
*newsk
)
2965 struct smack_known
*skp
;
2966 struct socket_smack
*ssp
= sock
->sk_security
;
2967 struct socket_smack
*osp
= other
->sk_security
;
2968 struct socket_smack
*nsp
= newsk
->sk_security
;
2969 struct smk_audit_info ad
;
2973 struct lsm_network_audit net
;
2975 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2976 smk_ad_setfield_u_net_sk(&ad
, other
);
2979 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
2981 rc
= smk_access(skp
, osp
->smk_in
, MAY_WRITE
, &ad
);
2985 * Cross reference the peer labels for SO_PEERSEC.
2988 nsp
->smk_packet
= ssp
->smk_out
->smk_known
;
2989 ssp
->smk_packet
= osp
->smk_out
->smk_known
;
2996 * smack_unix_may_send - Smack access on UDS
2998 * @other: the other socket
3000 * Return 0 if a subject with the smack of sock could access
3001 * an object with the smack of other, otherwise an error code
3003 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3005 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3006 struct socket_smack
*osp
= other
->sk
->sk_security
;
3007 struct smack_known
*skp
;
3008 struct smk_audit_info ad
;
3011 struct lsm_network_audit net
;
3013 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3014 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3017 if (smack_privileged(CAP_MAC_OVERRIDE
))
3021 return smk_access(skp
, osp
->smk_in
, MAY_WRITE
, &ad
);
3025 * smack_socket_sendmsg - Smack check based on destination host
3028 * @size: the size of the message
3030 * Return 0 if the current subject can write to the destination host.
3031 * For IPv4 this is only a question if the destination is a single label host.
3032 * For IPv6 this is a check against the label of the port.
3034 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3037 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3038 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3042 * Perfectly reasonable for this to be NULL
3047 switch (sip
->sin_family
) {
3049 rc
= smack_netlabel_send(sock
->sk
, sip
);
3052 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3059 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3060 * @sap: netlabel secattr
3061 * @ssp: socket security information
3063 * Returns a pointer to a Smack label entry found on the label list.
3065 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3066 struct socket_smack
*ssp
)
3068 struct smack_known
*skp
;
3073 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3075 * Looks like a CIPSO packet.
3076 * If there are flags but no level netlabel isn't
3077 * behaving the way we expect it to.
3079 * Look it up in the label table
3080 * Without guidance regarding the smack value
3081 * for the packet fall back on the network
3085 list_for_each_entry(skp
, &smack_known_list
, list
) {
3086 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3089 * Compare the catsets. Use the netlbl APIs.
3091 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3092 if ((skp
->smk_netlabel
.flags
&
3093 NETLBL_SECATTR_MLS_CAT
) == 0)
3097 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3098 acat
= netlbl_secattr_catmap_walk(
3099 sap
->attr
.mls
.cat
, acat
+ 1);
3100 kcat
= netlbl_secattr_catmap_walk(
3101 skp
->smk_netlabel
.attr
.mls
.cat
,
3103 if (acat
< 0 || kcat
< 0)
3116 if (ssp
!= NULL
&& ssp
->smk_in
== smack_known_star
.smk_known
)
3117 return &smack_known_web
;
3118 return &smack_known_star
;
3120 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3122 * Looks like a fallback, which gives us a secid.
3124 skp
= smack_from_secid(sap
->attr
.secid
);
3126 * This has got to be a bug because it is
3127 * impossible to specify a fallback without
3128 * specifying the label, which will ensure
3129 * it has a secid, and the only way to get a
3130 * secid is from a fallback.
3132 BUG_ON(skp
== NULL
);
3136 * Without guidance regarding the smack value
3137 * for the packet fall back on the network
3140 return smack_net_ambient
;
3143 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3147 int proto
= -EINVAL
;
3148 struct ipv6hdr _ipv6h
;
3149 struct ipv6hdr
*ip6
;
3151 struct tcphdr _tcph
, *th
;
3152 struct udphdr _udph
, *uh
;
3153 struct dccp_hdr _dccph
, *dh
;
3157 offset
= skb_network_offset(skb
);
3158 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3161 sip
->sin6_addr
= ip6
->saddr
;
3163 nexthdr
= ip6
->nexthdr
;
3164 offset
+= sizeof(_ipv6h
);
3165 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3172 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3174 sip
->sin6_port
= th
->source
;
3177 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3179 sip
->sin6_port
= uh
->source
;
3182 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3184 sip
->sin6_port
= dh
->dccph_sport
;
3191 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3195 * Returns 0 if the packet should be delivered, an error code otherwise
3197 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3199 struct netlbl_lsm_secattr secattr
;
3200 struct socket_smack
*ssp
= sk
->sk_security
;
3201 struct smack_known
*skp
;
3202 struct sockaddr_in6 sadd
;
3204 struct smk_audit_info ad
;
3206 struct lsm_network_audit net
;
3208 switch (sk
->sk_family
) {
3211 * Translate what netlabel gave us.
3213 netlbl_secattr_init(&secattr
);
3215 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3217 skp
= smack_from_secattr(&secattr
, ssp
);
3219 skp
= smack_net_ambient
;
3221 netlbl_secattr_destroy(&secattr
);
3224 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3225 ad
.a
.u
.net
->family
= sk
->sk_family
;
3226 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3227 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3230 * Receiving a packet requires that the other end
3231 * be able to write here. Read access is not required.
3232 * This is the simplist possible security model
3235 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3237 netlbl_skbuff_err(skb
, rc
, 0);
3240 rc
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3241 if (rc
== IPPROTO_UDP
|| rc
== IPPROTO_TCP
)
3242 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3251 * smack_socket_getpeersec_stream - pull in packet label
3253 * @optval: user's destination
3254 * @optlen: size thereof
3257 * returns zero on success, an error code otherwise
3259 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3260 char __user
*optval
,
3261 int __user
*optlen
, unsigned len
)
3263 struct socket_smack
*ssp
;
3268 ssp
= sock
->sk
->sk_security
;
3269 if (ssp
->smk_packet
!= NULL
) {
3270 rcp
= ssp
->smk_packet
;
3271 slen
= strlen(rcp
) + 1;
3276 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3279 if (put_user(slen
, optlen
) != 0)
3287 * smack_socket_getpeersec_dgram - pull in packet label
3288 * @sock: the peer socket
3290 * @secid: pointer to where to put the secid of the packet
3292 * Sets the netlabel socket state on sk from parent
3294 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
3295 struct sk_buff
*skb
, u32
*secid
)
3298 struct netlbl_lsm_secattr secattr
;
3299 struct socket_smack
*ssp
= NULL
;
3300 struct smack_known
*skp
;
3301 int family
= PF_UNSPEC
;
3302 u32 s
= 0; /* 0 is the invalid secid */
3306 if (skb
->protocol
== htons(ETH_P_IP
))
3308 else if (skb
->protocol
== htons(ETH_P_IPV6
))
3311 if (family
== PF_UNSPEC
&& sock
!= NULL
)
3312 family
= sock
->sk
->sk_family
;
3314 if (family
== PF_UNIX
) {
3315 ssp
= sock
->sk
->sk_security
;
3316 s
= ssp
->smk_out
->smk_secid
;
3317 } else if (family
== PF_INET
|| family
== PF_INET6
) {
3319 * Translate what netlabel gave us.
3321 if (sock
!= NULL
&& sock
->sk
!= NULL
)
3322 ssp
= sock
->sk
->sk_security
;
3323 netlbl_secattr_init(&secattr
);
3324 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3326 skp
= smack_from_secattr(&secattr
, ssp
);
3329 netlbl_secattr_destroy(&secattr
);
3338 * smack_sock_graft - Initialize a newly created socket with an existing sock
3340 * @parent: parent socket
3342 * Set the smk_{in,out} state of an existing sock based on the process that
3343 * is creating the new socket.
3345 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3347 struct socket_smack
*ssp
;
3348 struct smack_known
*skp
= smk_of_current();
3351 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3354 ssp
= sk
->sk_security
;
3355 ssp
->smk_in
= skp
->smk_known
;
3357 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3361 * smack_inet_conn_request - Smack access check on connect
3362 * @sk: socket involved
3366 * Returns 0 if a task with the packet label could write to
3367 * the socket, otherwise an error code
3369 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3370 struct request_sock
*req
)
3372 u16 family
= sk
->sk_family
;
3373 struct smack_known
*skp
;
3374 struct socket_smack
*ssp
= sk
->sk_security
;
3375 struct netlbl_lsm_secattr secattr
;
3376 struct sockaddr_in addr
;
3380 struct smk_audit_info ad
;
3382 struct lsm_network_audit net
;
3385 if (family
== PF_INET6
) {
3387 * Handle mapped IPv4 packets arriving
3388 * via IPv6 sockets. Don't set up netlabel
3389 * processing on IPv6.
3391 if (skb
->protocol
== htons(ETH_P_IP
))
3397 netlbl_secattr_init(&secattr
);
3398 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3400 skp
= smack_from_secattr(&secattr
, ssp
);
3402 skp
= &smack_known_huh
;
3403 netlbl_secattr_destroy(&secattr
);
3406 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3407 ad
.a
.u
.net
->family
= family
;
3408 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3409 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3412 * Receiving a packet requires that the other end be able to write
3413 * here. Read access is not required.
3415 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3420 * Save the peer's label in the request_sock so we can later setup
3421 * smk_packet in the child socket so that SO_PEERCRED can report it.
3423 req
->peer_secid
= skp
->smk_secid
;
3426 * We need to decide if we want to label the incoming connection here
3427 * if we do we only need to label the request_sock and the stack will
3428 * propagate the wire-label to the sock when it is created.
3431 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3433 hsp
= smack_host_label(&addr
);
3437 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
3439 netlbl_req_delattr(req
);
3445 * smack_inet_csk_clone - Copy the connection information to the new socket
3446 * @sk: the new socket
3447 * @req: the connection's request_sock
3449 * Transfer the connection's peer label to the newly created socket.
3451 static void smack_inet_csk_clone(struct sock
*sk
,
3452 const struct request_sock
*req
)
3454 struct socket_smack
*ssp
= sk
->sk_security
;
3455 struct smack_known
*skp
;
3457 if (req
->peer_secid
!= 0) {
3458 skp
= smack_from_secid(req
->peer_secid
);
3459 ssp
->smk_packet
= skp
->smk_known
;
3461 ssp
->smk_packet
= NULL
;
3465 * Key management security hooks
3467 * Casey has not tested key support very heavily.
3468 * The permission check is most likely too restrictive.
3469 * If you care about keys please have a look.
3474 * smack_key_alloc - Set the key security blob
3476 * @cred: the credentials to use
3479 * No allocation required
3483 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3484 unsigned long flags
)
3486 struct smack_known
*skp
= smk_of_task(cred
->security
);
3488 key
->security
= skp
->smk_known
;
3493 * smack_key_free - Clear the key security blob
3496 * Clear the blob pointer
3498 static void smack_key_free(struct key
*key
)
3500 key
->security
= NULL
;
3504 * smack_key_permission - Smack access on a key
3505 * @key_ref: gets to the object
3506 * @cred: the credentials to use
3509 * Return 0 if the task has read and write to the object,
3510 * an error code otherwise
3512 static int smack_key_permission(key_ref_t key_ref
,
3513 const struct cred
*cred
, key_perm_t perm
)
3516 struct smk_audit_info ad
;
3517 struct smack_known
*tkp
= smk_of_task(cred
->security
);
3519 keyp
= key_ref_to_ptr(key_ref
);
3523 * If the key hasn't been initialized give it access so that
3526 if (keyp
->security
== NULL
)
3529 * This should not occur
3534 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3535 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3536 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
3538 return smk_access(tkp
, keyp
->security
, MAY_READWRITE
, &ad
);
3540 #endif /* CONFIG_KEYS */
3545 * Audit requires a unique representation of each Smack specific
3546 * rule. This unique representation is used to distinguish the
3547 * object to be audited from remaining kernel objects and also
3548 * works as a glue between the audit hooks.
3550 * Since repository entries are added but never deleted, we'll use
3551 * the smack_known label address related to the given audit rule as
3552 * the needed unique representation. This also better fits the smack
3553 * model where nearly everything is a label.
3558 * smack_audit_rule_init - Initialize a smack audit rule
3559 * @field: audit rule fields given from user-space (audit.h)
3560 * @op: required testing operator (=, !=, >, <, ...)
3561 * @rulestr: smack label to be audited
3562 * @vrule: pointer to save our own audit rule representation
3564 * Prepare to audit cases where (@field @op @rulestr) is true.
3565 * The label to be audited is created if necessay.
3567 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
3569 char **rule
= (char **)vrule
;
3572 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3575 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
3578 *rule
= smk_import(rulestr
, 0);
3584 * smack_audit_rule_known - Distinguish Smack audit rules
3585 * @krule: rule of interest, in Audit kernel representation format
3587 * This is used to filter Smack rules from remaining Audit ones.
3588 * If it's proved that this rule belongs to us, the
3589 * audit_rule_match hook will be called to do the final judgement.
3591 static int smack_audit_rule_known(struct audit_krule
*krule
)
3593 struct audit_field
*f
;
3596 for (i
= 0; i
< krule
->field_count
; i
++) {
3597 f
= &krule
->fields
[i
];
3599 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
3607 * smack_audit_rule_match - Audit given object ?
3608 * @secid: security id for identifying the object to test
3609 * @field: audit rule flags given from user-space
3610 * @op: required testing operator
3611 * @vrule: smack internal rule presentation
3612 * @actx: audit context associated with the check
3614 * The core Audit hook. It's used to take the decision of
3615 * whether to audit or not to audit a given object.
3617 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
3618 struct audit_context
*actx
)
3620 struct smack_known
*skp
;
3624 audit_log(actx
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
,
3625 "Smack: missing rule\n");
3629 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3632 skp
= smack_from_secid(secid
);
3635 * No need to do string comparisons. If a match occurs,
3636 * both pointers will point to the same smack_known
3639 if (op
== Audit_equal
)
3640 return (rule
== skp
->smk_known
);
3641 if (op
== Audit_not_equal
)
3642 return (rule
!= skp
->smk_known
);
3648 * smack_audit_rule_free - free smack rule representation
3649 * @vrule: rule to be freed.
3651 * No memory was allocated.
3653 static void smack_audit_rule_free(void *vrule
)
3658 #endif /* CONFIG_AUDIT */
3661 * smack_ismaclabel - check if xattr @name references a smack MAC label
3662 * @name: Full xattr name to check.
3664 static int smack_ismaclabel(const char *name
)
3666 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
3671 * smack_secid_to_secctx - return the smack label for a secid
3672 * @secid: incoming integer
3673 * @secdata: destination
3674 * @seclen: how long it is
3676 * Exists for networking code.
3678 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3680 struct smack_known
*skp
= smack_from_secid(secid
);
3683 *secdata
= skp
->smk_known
;
3684 *seclen
= strlen(skp
->smk_known
);
3689 * smack_secctx_to_secid - return the secid for a smack label
3690 * @secdata: smack label
3691 * @seclen: how long result is
3692 * @secid: outgoing integer
3694 * Exists for audit and networking code.
3696 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3698 *secid
= smack_to_secid(secdata
);
3703 * smack_release_secctx - don't do anything.
3707 * Exists to make sure nothing gets done, and properly
3709 static void smack_release_secctx(char *secdata
, u32 seclen
)
3713 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3715 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
3718 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3720 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
3723 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
3726 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
3734 struct security_operations smack_ops
= {
3737 .ptrace_access_check
= smack_ptrace_access_check
,
3738 .ptrace_traceme
= smack_ptrace_traceme
,
3739 .syslog
= smack_syslog
,
3741 .sb_alloc_security
= smack_sb_alloc_security
,
3742 .sb_free_security
= smack_sb_free_security
,
3743 .sb_copy_data
= smack_sb_copy_data
,
3744 .sb_kern_mount
= smack_sb_kern_mount
,
3745 .sb_statfs
= smack_sb_statfs
,
3746 .sb_mount
= smack_sb_mount
,
3747 .sb_umount
= smack_sb_umount
,
3749 .bprm_set_creds
= smack_bprm_set_creds
,
3750 .bprm_committing_creds
= smack_bprm_committing_creds
,
3751 .bprm_secureexec
= smack_bprm_secureexec
,
3753 .inode_alloc_security
= smack_inode_alloc_security
,
3754 .inode_free_security
= smack_inode_free_security
,
3755 .inode_init_security
= smack_inode_init_security
,
3756 .inode_link
= smack_inode_link
,
3757 .inode_unlink
= smack_inode_unlink
,
3758 .inode_rmdir
= smack_inode_rmdir
,
3759 .inode_rename
= smack_inode_rename
,
3760 .inode_permission
= smack_inode_permission
,
3761 .inode_setattr
= smack_inode_setattr
,
3762 .inode_getattr
= smack_inode_getattr
,
3763 .inode_setxattr
= smack_inode_setxattr
,
3764 .inode_post_setxattr
= smack_inode_post_setxattr
,
3765 .inode_getxattr
= smack_inode_getxattr
,
3766 .inode_removexattr
= smack_inode_removexattr
,
3767 .inode_getsecurity
= smack_inode_getsecurity
,
3768 .inode_setsecurity
= smack_inode_setsecurity
,
3769 .inode_listsecurity
= smack_inode_listsecurity
,
3770 .inode_getsecid
= smack_inode_getsecid
,
3772 .file_permission
= smack_file_permission
,
3773 .file_alloc_security
= smack_file_alloc_security
,
3774 .file_free_security
= smack_file_free_security
,
3775 .file_ioctl
= smack_file_ioctl
,
3776 .file_lock
= smack_file_lock
,
3777 .file_fcntl
= smack_file_fcntl
,
3778 .mmap_file
= smack_mmap_file
,
3779 .mmap_addr
= cap_mmap_addr
,
3780 .file_set_fowner
= smack_file_set_fowner
,
3781 .file_send_sigiotask
= smack_file_send_sigiotask
,
3782 .file_receive
= smack_file_receive
,
3784 .file_open
= smack_file_open
,
3786 .cred_alloc_blank
= smack_cred_alloc_blank
,
3787 .cred_free
= smack_cred_free
,
3788 .cred_prepare
= smack_cred_prepare
,
3789 .cred_transfer
= smack_cred_transfer
,
3790 .kernel_act_as
= smack_kernel_act_as
,
3791 .kernel_create_files_as
= smack_kernel_create_files_as
,
3792 .task_setpgid
= smack_task_setpgid
,
3793 .task_getpgid
= smack_task_getpgid
,
3794 .task_getsid
= smack_task_getsid
,
3795 .task_getsecid
= smack_task_getsecid
,
3796 .task_setnice
= smack_task_setnice
,
3797 .task_setioprio
= smack_task_setioprio
,
3798 .task_getioprio
= smack_task_getioprio
,
3799 .task_setscheduler
= smack_task_setscheduler
,
3800 .task_getscheduler
= smack_task_getscheduler
,
3801 .task_movememory
= smack_task_movememory
,
3802 .task_kill
= smack_task_kill
,
3803 .task_wait
= smack_task_wait
,
3804 .task_to_inode
= smack_task_to_inode
,
3806 .ipc_permission
= smack_ipc_permission
,
3807 .ipc_getsecid
= smack_ipc_getsecid
,
3809 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
3810 .msg_msg_free_security
= smack_msg_msg_free_security
,
3812 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
3813 .msg_queue_free_security
= smack_msg_queue_free_security
,
3814 .msg_queue_associate
= smack_msg_queue_associate
,
3815 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
3816 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
3817 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
3819 .shm_alloc_security
= smack_shm_alloc_security
,
3820 .shm_free_security
= smack_shm_free_security
,
3821 .shm_associate
= smack_shm_associate
,
3822 .shm_shmctl
= smack_shm_shmctl
,
3823 .shm_shmat
= smack_shm_shmat
,
3825 .sem_alloc_security
= smack_sem_alloc_security
,
3826 .sem_free_security
= smack_sem_free_security
,
3827 .sem_associate
= smack_sem_associate
,
3828 .sem_semctl
= smack_sem_semctl
,
3829 .sem_semop
= smack_sem_semop
,
3831 .d_instantiate
= smack_d_instantiate
,
3833 .getprocattr
= smack_getprocattr
,
3834 .setprocattr
= smack_setprocattr
,
3836 .unix_stream_connect
= smack_unix_stream_connect
,
3837 .unix_may_send
= smack_unix_may_send
,
3839 .socket_post_create
= smack_socket_post_create
,
3840 .socket_bind
= smack_socket_bind
,
3841 .socket_connect
= smack_socket_connect
,
3842 .socket_sendmsg
= smack_socket_sendmsg
,
3843 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
3844 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
3845 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
3846 .sk_alloc_security
= smack_sk_alloc_security
,
3847 .sk_free_security
= smack_sk_free_security
,
3848 .sock_graft
= smack_sock_graft
,
3849 .inet_conn_request
= smack_inet_conn_request
,
3850 .inet_csk_clone
= smack_inet_csk_clone
,
3852 /* key management security hooks */
3854 .key_alloc
= smack_key_alloc
,
3855 .key_free
= smack_key_free
,
3856 .key_permission
= smack_key_permission
,
3857 #endif /* CONFIG_KEYS */
3861 .audit_rule_init
= smack_audit_rule_init
,
3862 .audit_rule_known
= smack_audit_rule_known
,
3863 .audit_rule_match
= smack_audit_rule_match
,
3864 .audit_rule_free
= smack_audit_rule_free
,
3865 #endif /* CONFIG_AUDIT */
3867 .ismaclabel
= smack_ismaclabel
,
3868 .secid_to_secctx
= smack_secid_to_secctx
,
3869 .secctx_to_secid
= smack_secctx_to_secid
,
3870 .release_secctx
= smack_release_secctx
,
3871 .inode_notifysecctx
= smack_inode_notifysecctx
,
3872 .inode_setsecctx
= smack_inode_setsecctx
,
3873 .inode_getsecctx
= smack_inode_getsecctx
,
3877 static __init
void init_smack_known_list(void)
3880 * Initialize rule list locks
3882 mutex_init(&smack_known_huh
.smk_rules_lock
);
3883 mutex_init(&smack_known_hat
.smk_rules_lock
);
3884 mutex_init(&smack_known_floor
.smk_rules_lock
);
3885 mutex_init(&smack_known_star
.smk_rules_lock
);
3886 mutex_init(&smack_known_invalid
.smk_rules_lock
);
3887 mutex_init(&smack_known_web
.smk_rules_lock
);
3889 * Initialize rule lists
3891 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
3892 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
3893 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
3894 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
3895 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
3896 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
3898 * Create the known labels list
3900 smk_insert_entry(&smack_known_huh
);
3901 smk_insert_entry(&smack_known_hat
);
3902 smk_insert_entry(&smack_known_star
);
3903 smk_insert_entry(&smack_known_floor
);
3904 smk_insert_entry(&smack_known_invalid
);
3905 smk_insert_entry(&smack_known_web
);
3909 * smack_init - initialize the smack system
3913 static __init
int smack_init(void)
3916 struct task_smack
*tsp
;
3918 if (!security_module_enable(&smack_ops
))
3921 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
3926 printk(KERN_INFO
"Smack: Initializing.\n");
3929 * Set the security state for the initial task.
3931 cred
= (struct cred
*) current
->cred
;
3932 cred
->security
= tsp
;
3934 /* initialize the smack_known_list */
3935 init_smack_known_list();
3940 if (register_security(&smack_ops
))
3941 panic("smack: Unable to register with kernel.\n");
3947 * Smack requires early initialization in order to label
3948 * all processes and objects when they are created.
3950 security_initcall(smack_init
);