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>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 DEFINE_MUTEX(smack_ipv6_lock
);
56 static LIST_HEAD(smk_ipv6_port_list
);
58 static struct kmem_cache
*smack_inode_cache
;
61 static const match_table_t smk_mount_tokens
= {
62 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
63 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
64 {Opt_fshat
, SMK_FSHAT
"%s"},
65 {Opt_fsroot
, SMK_FSROOT
"%s"},
66 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
71 static char *smk_bu_mess
[] = {
72 "Bringup Error", /* Unused */
73 "Bringup", /* SMACK_BRINGUP_ALLOW */
74 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
75 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
78 static void smk_bu_mode(int mode
, char *s
)
88 if (mode
& MAY_APPEND
)
90 if (mode
& MAY_TRANSMUTE
)
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
102 struct smack_known
*oskp
, int mode
, int rc
)
104 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
108 if (rc
> SMACK_UNCONFINED_OBJECT
)
111 smk_bu_mode(mode
, acc
);
112 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
113 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
124 struct task_smack
*tsp
= current_security();
125 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
129 if (rc
> SMACK_UNCONFINED_OBJECT
)
132 smk_bu_mode(mode
, acc
);
133 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
134 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
135 acc
, current
->comm
, note
);
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
145 struct task_smack
*tsp
= current_security();
146 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
147 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
151 if (rc
> SMACK_UNCONFINED_OBJECT
)
154 smk_bu_mode(mode
, acc
);
155 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
156 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
157 current
->comm
, otp
->comm
);
161 #define smk_bu_task(otp, mode, RC) (RC)
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
167 struct task_smack
*tsp
= current_security();
168 struct inode_smack
*isp
= inode
->i_security
;
169 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
171 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
172 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
177 if (rc
> SMACK_UNCONFINED_OBJECT
)
179 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
180 (mode
& (MAY_WRITE
| MAY_APPEND
)))
181 isp
->smk_flags
|= SMK_INODE_IMPURE
;
183 smk_bu_mode(mode
, acc
);
185 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
186 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
187 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
191 #define smk_bu_inode(inode, mode, RC) (RC)
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
197 struct task_smack
*tsp
= current_security();
198 struct smack_known
*sskp
= tsp
->smk_task
;
199 struct inode
*inode
= file_inode(file
);
200 struct inode_smack
*isp
= inode
->i_security
;
201 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
203 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
204 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
209 if (rc
> SMACK_UNCONFINED_OBJECT
)
212 smk_bu_mode(mode
, acc
);
213 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
214 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
215 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
220 #define smk_bu_file(file, mode, RC) (RC)
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
227 struct task_smack
*tsp
= cred
->security
;
228 struct smack_known
*sskp
= tsp
->smk_task
;
229 struct inode
*inode
= file_inode(file
);
230 struct inode_smack
*isp
= inode
->i_security
;
231 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
233 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
234 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
239 if (rc
> SMACK_UNCONFINED_OBJECT
)
242 smk_bu_mode(mode
, acc
);
243 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
244 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
245 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
254 * smk_fetch - Fetch the smack label from a file.
255 * @name: type of the label (attribute)
256 * @ip: a pointer to the inode
257 * @dp: a pointer to the dentry
259 * Returns a pointer to the master list entry for the Smack label,
260 * NULL if there was no label to fetch, or an error code.
262 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
267 struct smack_known
*skp
= NULL
;
269 if (!(ip
->i_opflags
& IOP_XATTR
))
270 return ERR_PTR(-EOPNOTSUPP
);
272 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
274 return ERR_PTR(-ENOMEM
);
276 rc
= __vfs_getxattr(dp
, ip
, name
, buffer
, SMK_LONGLABEL
);
282 skp
= smk_import_entry(buffer
, rc
);
290 * new_inode_smack - allocate an inode security blob
291 * @skp: a pointer to the Smack label entry to use in the blob
293 * Returns the new blob or NULL if there's no memory available
295 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
297 struct inode_smack
*isp
;
299 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
303 isp
->smk_inode
= skp
;
305 mutex_init(&isp
->smk_lock
);
311 * new_task_smack - allocate a task security blob
312 * @task: a pointer to the Smack label for the running task
313 * @forked: a pointer to the Smack label for the forked task
314 * @gfp: type of the memory for the allocation
316 * Returns the new blob or NULL if there's no memory available
318 static struct task_smack
*new_task_smack(struct smack_known
*task
,
319 struct smack_known
*forked
, gfp_t gfp
)
321 struct task_smack
*tsp
;
323 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
327 tsp
->smk_task
= task
;
328 tsp
->smk_forked
= forked
;
329 INIT_LIST_HEAD(&tsp
->smk_rules
);
330 INIT_LIST_HEAD(&tsp
->smk_relabel
);
331 mutex_init(&tsp
->smk_rules_lock
);
337 * smk_copy_rules - copy a rule set
338 * @nhead: new rules header pointer
339 * @ohead: old rules header pointer
340 * @gfp: type of the memory for the allocation
342 * Returns 0 on success, -ENOMEM on error
344 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
347 struct smack_rule
*nrp
;
348 struct smack_rule
*orp
;
351 INIT_LIST_HEAD(nhead
);
353 list_for_each_entry_rcu(orp
, ohead
, list
) {
354 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
360 list_add_rcu(&nrp
->list
, nhead
);
366 * smk_copy_relabel - copy smk_relabel labels list
367 * @nhead: new rules header pointer
368 * @ohead: old rules header pointer
369 * @gfp: type of the memory for the allocation
371 * Returns 0 on success, -ENOMEM on error
373 static int smk_copy_relabel(struct list_head
*nhead
, struct list_head
*ohead
,
376 struct smack_known_list_elem
*nklep
;
377 struct smack_known_list_elem
*oklep
;
379 INIT_LIST_HEAD(nhead
);
381 list_for_each_entry(oklep
, ohead
, list
) {
382 nklep
= kzalloc(sizeof(struct smack_known_list_elem
), gfp
);
384 smk_destroy_label_list(nhead
);
387 nklep
->smk_label
= oklep
->smk_label
;
388 list_add(&nklep
->list
, nhead
);
395 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
396 * @mode - input mode in form of PTRACE_MODE_*
398 * Returns a converted MAY_* mode usable by smack rules
400 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
402 if (mode
& PTRACE_MODE_ATTACH
)
403 return MAY_READWRITE
;
404 if (mode
& PTRACE_MODE_READ
)
411 * smk_ptrace_rule_check - helper for ptrace access
412 * @tracer: tracer process
413 * @tracee_known: label entry of the process that's about to be traced
414 * @mode: ptrace attachment mode (PTRACE_MODE_*)
415 * @func: name of the function that called us, used for audit
417 * Returns 0 on access granted, -error on error
419 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
420 struct smack_known
*tracee_known
,
421 unsigned int mode
, const char *func
)
424 struct smk_audit_info ad
, *saip
= NULL
;
425 struct task_smack
*tsp
;
426 struct smack_known
*tracer_known
;
428 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
429 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
430 smk_ad_setfield_u_tsk(&ad
, tracer
);
435 tsp
= __task_cred(tracer
)->security
;
436 tracer_known
= smk_of_task(tsp
);
438 if ((mode
& PTRACE_MODE_ATTACH
) &&
439 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
440 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
441 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
443 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
445 else if (capable(CAP_SYS_PTRACE
))
451 smack_log(tracer_known
->smk_known
,
452 tracee_known
->smk_known
,
459 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
460 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
468 * We he, that is fun!
472 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
473 * @ctp: child task pointer
474 * @mode: ptrace attachment mode (PTRACE_MODE_*)
476 * Returns 0 if access is OK, an error code otherwise
478 * Do the capability checks.
480 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
482 struct smack_known
*skp
;
484 skp
= smk_of_task_struct(ctp
);
486 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
490 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
491 * @ptp: parent task pointer
493 * Returns 0 if access is OK, an error code otherwise
495 * Do the capability checks, and require PTRACE_MODE_ATTACH.
497 static int smack_ptrace_traceme(struct task_struct
*ptp
)
500 struct smack_known
*skp
;
502 skp
= smk_of_task(current_security());
504 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
509 * smack_syslog - Smack approval on syslog
510 * @type: message type
512 * Returns 0 on success, error code otherwise.
514 static int smack_syslog(int typefrom_file
)
517 struct smack_known
*skp
= smk_of_current();
519 if (smack_privileged(CAP_MAC_OVERRIDE
))
522 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
534 * smack_sb_alloc_security - allocate a superblock blob
535 * @sb: the superblock getting the blob
537 * Returns 0 on success or -ENOMEM on error.
539 static int smack_sb_alloc_security(struct super_block
*sb
)
541 struct superblock_smack
*sbsp
;
543 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
548 sbsp
->smk_root
= &smack_known_floor
;
549 sbsp
->smk_default
= &smack_known_floor
;
550 sbsp
->smk_floor
= &smack_known_floor
;
551 sbsp
->smk_hat
= &smack_known_hat
;
553 * SMK_SB_INITIALIZED will be zero from kzalloc.
555 sb
->s_security
= sbsp
;
561 * smack_sb_free_security - free a superblock blob
562 * @sb: the superblock getting the blob
565 static void smack_sb_free_security(struct super_block
*sb
)
567 kfree(sb
->s_security
);
568 sb
->s_security
= NULL
;
572 * smack_sb_copy_data - copy mount options data for processing
573 * @orig: where to start
574 * @smackopts: mount options string
576 * Returns 0 on success or -ENOMEM on error.
578 * Copy the Smack specific mount options out of the mount
581 static int smack_sb_copy_data(char *orig
, char *smackopts
)
583 char *cp
, *commap
, *otheropts
, *dp
;
585 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
586 if (otheropts
== NULL
)
589 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
590 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
592 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
594 else if (strstr(cp
, SMK_FSHAT
) == cp
)
596 else if (strstr(cp
, SMK_FSROOT
) == cp
)
598 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
603 commap
= strchr(cp
, ',');
612 strcpy(orig
, otheropts
);
613 free_page((unsigned long)otheropts
);
619 * smack_parse_opts_str - parse Smack specific mount options
620 * @options: mount options string
621 * @opts: where to store converted mount opts
623 * Returns 0 on success or -ENOMEM on error.
625 * converts Smack specific mount options to generic security option format
627 static int smack_parse_opts_str(char *options
,
628 struct security_mnt_opts
*opts
)
631 char *fsdefault
= NULL
;
632 char *fsfloor
= NULL
;
635 char *fstransmute
= NULL
;
637 int num_mnt_opts
= 0;
640 opts
->num_mnt_opts
= 0;
645 while ((p
= strsep(&options
, ",")) != NULL
) {
646 substring_t args
[MAX_OPT_ARGS
];
651 token
= match_token(p
, smk_mount_tokens
, args
);
657 fsdefault
= match_strdup(&args
[0]);
664 fsfloor
= match_strdup(&args
[0]);
671 fshat
= match_strdup(&args
[0]);
678 fsroot
= match_strdup(&args
[0]);
682 case Opt_fstransmute
:
685 fstransmute
= match_strdup(&args
[0]);
691 pr_warn("Smack: unknown mount option\n");
696 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_KERNEL
);
700 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
702 if (!opts
->mnt_opts_flags
) {
703 kfree(opts
->mnt_opts
);
708 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
709 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
712 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
713 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
716 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
717 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
720 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
721 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
724 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
725 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
728 opts
->num_mnt_opts
= num_mnt_opts
;
733 pr_warn("Smack: duplicate mount options\n");
745 * smack_set_mnt_opts - set Smack specific mount options
746 * @sb: the file system superblock
747 * @opts: Smack mount options
748 * @kern_flags: mount option from kernel space or user space
749 * @set_kern_flags: where to store converted mount opts
751 * Returns 0 on success, an error code on failure
753 * Allow filesystems with binary mount data to explicitly set Smack mount
756 static int smack_set_mnt_opts(struct super_block
*sb
,
757 struct security_mnt_opts
*opts
,
758 unsigned long kern_flags
,
759 unsigned long *set_kern_flags
)
761 struct dentry
*root
= sb
->s_root
;
762 struct inode
*inode
= d_backing_inode(root
);
763 struct superblock_smack
*sp
= sb
->s_security
;
764 struct inode_smack
*isp
;
765 struct smack_known
*skp
;
767 int num_opts
= opts
->num_mnt_opts
;
770 if (sp
->smk_flags
& SMK_SB_INITIALIZED
)
773 if (!smack_privileged(CAP_MAC_ADMIN
)) {
775 * Unprivileged mounts don't get to specify Smack values.
780 * Unprivileged mounts get root and default from the caller.
782 skp
= smk_of_current();
784 sp
->smk_default
= skp
;
786 * For a handful of fs types with no user-controlled
787 * backing store it's okay to trust security labels
788 * in the filesystem. The rest are untrusted.
790 if (sb
->s_user_ns
!= &init_user_ns
&&
791 sb
->s_magic
!= SYSFS_MAGIC
&& sb
->s_magic
!= TMPFS_MAGIC
&&
792 sb
->s_magic
!= RAMFS_MAGIC
) {
794 sp
->smk_flags
|= SMK_SB_UNTRUSTED
;
798 sp
->smk_flags
|= SMK_SB_INITIALIZED
;
800 for (i
= 0; i
< num_opts
; i
++) {
801 switch (opts
->mnt_opts_flags
[i
]) {
803 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
806 sp
->smk_default
= skp
;
809 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
815 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
821 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
827 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
839 * Initialize the root inode.
841 isp
= inode
->i_security
;
843 isp
= new_inode_smack(sp
->smk_root
);
846 inode
->i_security
= isp
;
848 isp
->smk_inode
= sp
->smk_root
;
851 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
857 * smack_sb_kern_mount - Smack specific mount processing
858 * @sb: the file system superblock
859 * @flags: the mount flags
860 * @data: the smack mount options
862 * Returns 0 on success, an error code on failure
864 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
867 char *options
= data
;
868 struct security_mnt_opts opts
;
870 security_init_mnt_opts(&opts
);
875 rc
= smack_parse_opts_str(options
, &opts
);
880 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
883 security_free_mnt_opts(&opts
);
888 * smack_sb_statfs - Smack check on statfs
889 * @dentry: identifies the file system in question
891 * Returns 0 if current can read the floor of the filesystem,
892 * and error code otherwise
894 static int smack_sb_statfs(struct dentry
*dentry
)
896 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
898 struct smk_audit_info ad
;
900 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
901 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
903 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
904 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
913 * smack_bprm_set_creds - set creds for exec
914 * @bprm: the exec information
916 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
918 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
920 struct inode
*inode
= file_inode(bprm
->file
);
921 struct task_smack
*bsp
= bprm
->cred
->security
;
922 struct inode_smack
*isp
;
923 struct superblock_smack
*sbsp
;
926 if (bprm
->cred_prepared
)
929 isp
= inode
->i_security
;
930 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
933 sbsp
= inode
->i_sb
->s_security
;
934 if ((sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) &&
935 isp
->smk_task
!= sbsp
->smk_root
)
938 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
939 struct task_struct
*tracer
;
943 tracer
= ptrace_parent(current
);
944 if (likely(tracer
!= NULL
))
945 rc
= smk_ptrace_rule_check(tracer
,
953 } else if (bprm
->unsafe
)
956 bsp
->smk_task
= isp
->smk_task
;
957 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
963 * smack_bprm_committing_creds - Prepare to install the new credentials
966 * @bprm: binprm for exec
968 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
970 struct task_smack
*bsp
= bprm
->cred
->security
;
972 if (bsp
->smk_task
!= bsp
->smk_forked
)
973 current
->pdeath_signal
= 0;
977 * smack_bprm_secureexec - Return the decision to use secureexec.
978 * @bprm: binprm for exec
980 * Returns 0 on success.
982 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
984 struct task_smack
*tsp
= current_security();
986 if (tsp
->smk_task
!= tsp
->smk_forked
)
997 * smack_inode_alloc_security - allocate an inode blob
998 * @inode: the inode in need of a blob
1000 * Returns 0 if it gets a blob, -ENOMEM otherwise
1002 static int smack_inode_alloc_security(struct inode
*inode
)
1004 struct smack_known
*skp
= smk_of_current();
1006 inode
->i_security
= new_inode_smack(skp
);
1007 if (inode
->i_security
== NULL
)
1013 * smack_inode_free_security - free an inode blob
1014 * @inode: the inode with a blob
1016 * Clears the blob pointer in inode
1018 static void smack_inode_free_security(struct inode
*inode
)
1020 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
1021 inode
->i_security
= NULL
;
1025 * smack_inode_init_security - copy out the smack from an inode
1026 * @inode: the newly created inode
1027 * @dir: containing directory object
1029 * @name: where to put the attribute name
1030 * @value: where to put the attribute value
1031 * @len: where to put the length of the attribute
1033 * Returns 0 if it all works out, -ENOMEM if there's no memory
1035 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1036 const struct qstr
*qstr
, const char **name
,
1037 void **value
, size_t *len
)
1039 struct inode_smack
*issp
= inode
->i_security
;
1040 struct smack_known
*skp
= smk_of_current();
1041 struct smack_known
*isp
= smk_of_inode(inode
);
1042 struct smack_known
*dsp
= smk_of_inode(dir
);
1046 *name
= XATTR_SMACK_SUFFIX
;
1050 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1055 * If the access rule allows transmutation and
1056 * the directory requests transmutation then
1057 * by all means transmute.
1058 * Mark the inode as changed.
1060 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1061 smk_inode_transmutable(dir
)) {
1063 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1066 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1070 *len
= strlen(isp
->smk_known
);
1077 * smack_inode_link - Smack check on link
1078 * @old_dentry: the existing object
1080 * @new_dentry: the new object
1082 * Returns 0 if access is permitted, an error code otherwise
1084 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1085 struct dentry
*new_dentry
)
1087 struct smack_known
*isp
;
1088 struct smk_audit_info ad
;
1091 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1092 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1094 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1095 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1096 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1098 if (rc
== 0 && d_is_positive(new_dentry
)) {
1099 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1100 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1101 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1102 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1109 * smack_inode_unlink - Smack check on inode deletion
1110 * @dir: containing directory object
1111 * @dentry: file to unlink
1113 * Returns 0 if current can write the containing directory
1114 * and the object, error code otherwise
1116 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1118 struct inode
*ip
= d_backing_inode(dentry
);
1119 struct smk_audit_info ad
;
1122 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1123 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1126 * You need write access to the thing you're unlinking
1128 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1129 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1132 * You also need write access to the containing directory
1134 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1135 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1136 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1137 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1143 * smack_inode_rmdir - Smack check on directory deletion
1144 * @dir: containing directory object
1145 * @dentry: directory to unlink
1147 * Returns 0 if current can write the containing directory
1148 * and the directory, error code otherwise
1150 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1152 struct smk_audit_info ad
;
1155 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1156 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1159 * You need write access to the thing you're removing
1161 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1162 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1165 * You also need write access to the containing directory
1167 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1168 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1169 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1170 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1177 * smack_inode_rename - Smack check on rename
1178 * @old_inode: unused
1179 * @old_dentry: the old object
1180 * @new_inode: unused
1181 * @new_dentry: the new object
1183 * Read and write access is required on both the old and
1186 * Returns 0 if access is permitted, an error code otherwise
1188 static int smack_inode_rename(struct inode
*old_inode
,
1189 struct dentry
*old_dentry
,
1190 struct inode
*new_inode
,
1191 struct dentry
*new_dentry
)
1194 struct smack_known
*isp
;
1195 struct smk_audit_info ad
;
1197 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1198 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1200 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1201 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1202 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1204 if (rc
== 0 && d_is_positive(new_dentry
)) {
1205 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1206 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1207 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1208 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1214 * smack_inode_permission - Smack version of permission()
1215 * @inode: the inode in question
1216 * @mask: the access requested
1218 * This is the important Smack hook.
1220 * Returns 0 if access is permitted, -EACCES otherwise
1222 static int smack_inode_permission(struct inode
*inode
, int mask
)
1224 struct superblock_smack
*sbsp
= inode
->i_sb
->s_security
;
1225 struct smk_audit_info ad
;
1226 int no_block
= mask
& MAY_NOT_BLOCK
;
1229 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1231 * No permission to check. Existence test. Yup, it's there.
1236 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) {
1237 if (smk_of_inode(inode
) != sbsp
->smk_root
)
1241 /* May be droppable after audit */
1244 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1245 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1246 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1247 rc
= smk_bu_inode(inode
, mask
, rc
);
1252 * smack_inode_setattr - Smack check for setting attributes
1253 * @dentry: the object
1254 * @iattr: for the force flag
1256 * Returns 0 if access is permitted, an error code otherwise
1258 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1260 struct smk_audit_info ad
;
1264 * Need to allow for clearing the setuid bit.
1266 if (iattr
->ia_valid
& ATTR_FORCE
)
1268 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1269 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1271 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1272 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1277 * smack_inode_getattr - Smack check for getting attributes
1278 * @mnt: vfsmount of the object
1279 * @dentry: the object
1281 * Returns 0 if access is permitted, an error code otherwise
1283 static int smack_inode_getattr(const struct path
*path
)
1285 struct smk_audit_info ad
;
1286 struct inode
*inode
= d_backing_inode(path
->dentry
);
1289 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1290 smk_ad_setfield_u_fs_path(&ad
, *path
);
1291 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1292 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1297 * smack_inode_setxattr - Smack check for setting xattrs
1298 * @dentry: the object
1299 * @name: name of the attribute
1300 * @value: value of the attribute
1301 * @size: size of the value
1304 * This protects the Smack attribute explicitly.
1306 * Returns 0 if access is permitted, an error code otherwise
1308 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1309 const void *value
, size_t size
, int flags
)
1311 struct smk_audit_info ad
;
1312 struct smack_known
*skp
;
1314 int check_import
= 0;
1319 * Check label validity here so import won't fail in post_setxattr
1321 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1322 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1323 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1326 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1327 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1331 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1333 if (size
!= TRANS_TRUE_SIZE
||
1334 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1337 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1339 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1342 if (rc
== 0 && check_import
) {
1343 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1346 else if (skp
== NULL
|| (check_star
&&
1347 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1351 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1352 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1355 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1356 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1363 * smack_inode_post_setxattr - Apply the Smack update approved above
1365 * @name: attribute name
1366 * @value: attribute value
1367 * @size: attribute size
1370 * Set the pointer in the inode blob to the entry found
1371 * in the master label list.
1373 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1374 const void *value
, size_t size
, int flags
)
1376 struct smack_known
*skp
;
1377 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1379 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1380 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1384 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1385 skp
= smk_import_entry(value
, size
);
1387 isp
->smk_inode
= skp
;
1388 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1389 skp
= smk_import_entry(value
, size
);
1391 isp
->smk_task
= skp
;
1392 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1393 skp
= smk_import_entry(value
, size
);
1395 isp
->smk_mmap
= skp
;
1402 * smack_inode_getxattr - Smack check on getxattr
1403 * @dentry: the object
1406 * Returns 0 if access is permitted, an error code otherwise
1408 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1410 struct smk_audit_info ad
;
1413 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1414 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1416 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1417 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1422 * smack_inode_removexattr - Smack check on removexattr
1423 * @dentry: the object
1424 * @name: name of the attribute
1426 * Removing the Smack attribute requires CAP_MAC_ADMIN
1428 * Returns 0 if access is permitted, an error code otherwise
1430 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1432 struct inode_smack
*isp
;
1433 struct smk_audit_info ad
;
1436 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1437 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1438 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1439 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1440 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1441 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1442 if (!smack_privileged(CAP_MAC_ADMIN
))
1445 rc
= cap_inode_removexattr(dentry
, name
);
1450 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1451 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1453 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1454 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1458 isp
= d_backing_inode(dentry
)->i_security
;
1460 * Don't do anything special for these.
1461 * XATTR_NAME_SMACKIPIN
1462 * XATTR_NAME_SMACKIPOUT
1464 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1465 struct super_block
*sbp
= dentry
->d_sb
;
1466 struct superblock_smack
*sbsp
= sbp
->s_security
;
1468 isp
->smk_inode
= sbsp
->smk_default
;
1469 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0)
1470 isp
->smk_task
= NULL
;
1471 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1472 isp
->smk_mmap
= NULL
;
1473 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1474 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1480 * smack_inode_getsecurity - get smack xattrs
1481 * @inode: the object
1482 * @name: attribute name
1483 * @buffer: where to put the result
1486 * Returns the size of the attribute or an error code
1488 static int smack_inode_getsecurity(struct inode
*inode
,
1489 const char *name
, void **buffer
,
1492 struct socket_smack
*ssp
;
1493 struct socket
*sock
;
1494 struct super_block
*sbp
;
1495 struct inode
*ip
= (struct inode
*)inode
;
1496 struct smack_known
*isp
;
1500 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1501 isp
= smk_of_inode(inode
);
1502 ilen
= strlen(isp
->smk_known
);
1503 *buffer
= isp
->smk_known
;
1508 * The rest of the Smack xattrs are only on sockets.
1511 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1514 sock
= SOCKET_I(ip
);
1515 if (sock
== NULL
|| sock
->sk
== NULL
)
1518 ssp
= sock
->sk
->sk_security
;
1520 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1522 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1527 ilen
= strlen(isp
->smk_known
);
1529 *buffer
= isp
->smk_known
;
1538 * smack_inode_listsecurity - list the Smack attributes
1539 * @inode: the object
1540 * @buffer: where they go
1541 * @buffer_size: size of buffer
1543 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1546 int len
= sizeof(XATTR_NAME_SMACK
);
1548 if (buffer
!= NULL
&& len
<= buffer_size
)
1549 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1555 * smack_inode_getsecid - Extract inode's security id
1556 * @inode: inode to extract the info from
1557 * @secid: where result will be saved
1559 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1561 struct inode_smack
*isp
= inode
->i_security
;
1563 *secid
= isp
->smk_inode
->smk_secid
;
1571 * There is no smack_file_permission hook
1573 * Should access checks be done on each read or write?
1574 * UNICOS and SELinux say yes.
1575 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1577 * I'll say no for now. Smack does not do the frequent
1578 * label changing that SELinux does.
1582 * smack_file_alloc_security - assign a file security blob
1585 * The security blob for a file is a pointer to the master
1586 * label list, so no allocation is done.
1588 * f_security is the owner security information. It
1589 * isn't used on file access checks, it's for send_sigio.
1593 static int smack_file_alloc_security(struct file
*file
)
1595 struct smack_known
*skp
= smk_of_current();
1597 file
->f_security
= skp
;
1602 * smack_file_free_security - clear a file security blob
1605 * The security blob for a file is a pointer to the master
1606 * label list, so no memory is freed.
1608 static void smack_file_free_security(struct file
*file
)
1610 file
->f_security
= NULL
;
1614 * smack_file_ioctl - Smack check on ioctls
1619 * Relies heavily on the correct use of the ioctl command conventions.
1621 * Returns 0 if allowed, error code otherwise
1623 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1627 struct smk_audit_info ad
;
1628 struct inode
*inode
= file_inode(file
);
1630 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1631 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1633 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1634 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1635 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1638 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1639 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1640 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1647 * smack_file_lock - Smack check on file locking
1651 * Returns 0 if current has lock access, error code otherwise
1653 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1655 struct smk_audit_info ad
;
1657 struct inode
*inode
= file_inode(file
);
1659 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1660 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1661 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1662 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1667 * smack_file_fcntl - Smack check on fcntl
1669 * @cmd: what action to check
1672 * Generally these operations are harmless.
1673 * File locking operations present an obvious mechanism
1674 * for passing information, so they require write access.
1676 * Returns 0 if current has access, error code otherwise
1678 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1681 struct smk_audit_info ad
;
1683 struct inode
*inode
= file_inode(file
);
1690 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1691 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1692 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1693 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1697 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1698 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1699 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1700 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1711 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1712 * if mapping anonymous memory.
1713 * @file contains the file structure for file to map (may be NULL).
1714 * @reqprot contains the protection requested by the application.
1715 * @prot contains the protection that will be applied by the kernel.
1716 * @flags contains the operational flags.
1717 * Return 0 if permission is granted.
1719 static int smack_mmap_file(struct file
*file
,
1720 unsigned long reqprot
, unsigned long prot
,
1721 unsigned long flags
)
1723 struct smack_known
*skp
;
1724 struct smack_known
*mkp
;
1725 struct smack_rule
*srp
;
1726 struct task_smack
*tsp
;
1727 struct smack_known
*okp
;
1728 struct inode_smack
*isp
;
1729 struct superblock_smack
*sbsp
;
1738 isp
= file_inode(file
)->i_security
;
1739 if (isp
->smk_mmap
== NULL
)
1741 sbsp
= file_inode(file
)->i_sb
->s_security
;
1742 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
&&
1743 isp
->smk_mmap
!= sbsp
->smk_root
)
1745 mkp
= isp
->smk_mmap
;
1747 tsp
= current_security();
1748 skp
= smk_of_current();
1753 * For each Smack rule associated with the subject
1754 * label verify that the SMACK64MMAP also has access
1755 * to that rule's object label.
1757 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1758 okp
= srp
->smk_object
;
1760 * Matching labels always allows access.
1762 if (mkp
->smk_known
== okp
->smk_known
)
1765 * If there is a matching local rule take
1766 * that into account as well.
1768 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1772 may
= srp
->smk_access
;
1774 may
&= srp
->smk_access
;
1776 * If may is zero the SMACK64MMAP subject can't
1777 * possibly have less access.
1783 * Fetch the global list entry.
1784 * If there isn't one a SMACK64MMAP subject
1785 * can't have as much access as current.
1787 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1789 if (mmay
== -ENOENT
) {
1794 * If there is a local entry it modifies the
1795 * potential access, too.
1797 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1799 if (tmay
!= -ENOENT
)
1803 * If there is any access available to current that is
1804 * not available to a SMACK64MMAP subject
1807 if ((may
| mmay
) != mmay
) {
1819 * smack_file_set_fowner - set the file security blob value
1820 * @file: object in question
1823 static void smack_file_set_fowner(struct file
*file
)
1825 file
->f_security
= smk_of_current();
1829 * smack_file_send_sigiotask - Smack on sigio
1830 * @tsk: The target task
1831 * @fown: the object the signal come from
1834 * Allow a privileged task to get signals even if it shouldn't
1836 * Returns 0 if a subject with the object's smack could
1837 * write to the task, an error code otherwise.
1839 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1840 struct fown_struct
*fown
, int signum
)
1842 struct smack_known
*skp
;
1843 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1846 struct smk_audit_info ad
;
1849 * struct fown_struct is never outside the context of a struct file
1851 file
= container_of(fown
, struct file
, f_owner
);
1853 /* we don't log here as rc can be overriden */
1854 skp
= file
->f_security
;
1855 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, NULL
);
1856 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_DELIVER
, rc
);
1857 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1860 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1861 smk_ad_setfield_u_tsk(&ad
, tsk
);
1862 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_DELIVER
, rc
, &ad
);
1867 * smack_file_receive - Smack file receive check
1870 * Returns 0 if current has access, error code otherwise
1872 static int smack_file_receive(struct file
*file
)
1876 struct smk_audit_info ad
;
1877 struct inode
*inode
= file_inode(file
);
1878 struct socket
*sock
;
1879 struct task_smack
*tsp
;
1880 struct socket_smack
*ssp
;
1882 if (unlikely(IS_PRIVATE(inode
)))
1885 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1886 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1888 if (S_ISSOCK(inode
->i_mode
)) {
1889 sock
= SOCKET_I(inode
);
1890 ssp
= sock
->sk
->sk_security
;
1891 tsp
= current_security();
1893 * If the receiving process can't write to the
1894 * passed socket or if the passed socket can't
1895 * write to the receiving process don't accept
1896 * the passed socket.
1898 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1899 rc
= smk_bu_file(file
, may
, rc
);
1902 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1903 rc
= smk_bu_file(file
, may
, rc
);
1907 * This code relies on bitmasks.
1909 if (file
->f_mode
& FMODE_READ
)
1911 if (file
->f_mode
& FMODE_WRITE
)
1914 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1915 rc
= smk_bu_file(file
, may
, rc
);
1920 * smack_file_open - Smack dentry open processing
1922 * @cred: task credential
1924 * Set the security blob in the file structure.
1925 * Allow the open only if the task has read access. There are
1926 * many read operations (e.g. fstat) that you can do with an
1927 * fd even if you have the file open write-only.
1931 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1933 struct task_smack
*tsp
= cred
->security
;
1934 struct inode
*inode
= file_inode(file
);
1935 struct smk_audit_info ad
;
1938 if (smack_privileged(CAP_MAC_OVERRIDE
))
1941 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1942 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1943 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1944 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1954 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1955 * @new: the new credentials
1956 * @gfp: the atomicity of any memory allocations
1958 * Prepare a blank set of credentials for modification. This must allocate all
1959 * the memory the LSM module might require such that cred_transfer() can
1960 * complete without error.
1962 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1964 struct task_smack
*tsp
;
1966 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1970 cred
->security
= tsp
;
1977 * smack_cred_free - "free" task-level security credentials
1978 * @cred: the credentials in question
1981 static void smack_cred_free(struct cred
*cred
)
1983 struct task_smack
*tsp
= cred
->security
;
1984 struct smack_rule
*rp
;
1985 struct list_head
*l
;
1986 struct list_head
*n
;
1990 cred
->security
= NULL
;
1992 smk_destroy_label_list(&tsp
->smk_relabel
);
1994 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1995 rp
= list_entry(l
, struct smack_rule
, list
);
1996 list_del(&rp
->list
);
2003 * smack_cred_prepare - prepare new set of credentials for modification
2004 * @new: the new credentials
2005 * @old: the original credentials
2006 * @gfp: the atomicity of any memory allocations
2008 * Prepare a new set of credentials for modification.
2010 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
2013 struct task_smack
*old_tsp
= old
->security
;
2014 struct task_smack
*new_tsp
;
2017 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
2018 if (new_tsp
== NULL
)
2021 new->security
= new_tsp
;
2023 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
2027 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
2036 * smack_cred_transfer - Transfer the old credentials to the new credentials
2037 * @new: the new credentials
2038 * @old: the original credentials
2040 * Fill in a set of blank credentials from another set of credentials.
2042 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2044 struct task_smack
*old_tsp
= old
->security
;
2045 struct task_smack
*new_tsp
= new->security
;
2047 new_tsp
->smk_task
= old_tsp
->smk_task
;
2048 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2049 mutex_init(&new_tsp
->smk_rules_lock
);
2050 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2053 /* cbs copy rule list */
2057 * smack_kernel_act_as - Set the subjective context in a set of credentials
2058 * @new: points to the set of credentials to be modified.
2059 * @secid: specifies the security ID to be set
2061 * Set the security data for a kernel service.
2063 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2065 struct task_smack
*new_tsp
= new->security
;
2067 new_tsp
->smk_task
= smack_from_secid(secid
);
2072 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2073 * @new: points to the set of credentials to be modified
2074 * @inode: points to the inode to use as a reference
2076 * Set the file creation context in a set of credentials to the same
2077 * as the objective context of the specified inode
2079 static int smack_kernel_create_files_as(struct cred
*new,
2080 struct inode
*inode
)
2082 struct inode_smack
*isp
= inode
->i_security
;
2083 struct task_smack
*tsp
= new->security
;
2085 tsp
->smk_forked
= isp
->smk_inode
;
2086 tsp
->smk_task
= tsp
->smk_forked
;
2091 * smk_curacc_on_task - helper to log task related access
2092 * @p: the task object
2093 * @access: the access requested
2094 * @caller: name of the calling function for audit
2096 * Return 0 if access is permitted
2098 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2101 struct smk_audit_info ad
;
2102 struct smack_known
*skp
= smk_of_task_struct(p
);
2105 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2106 smk_ad_setfield_u_tsk(&ad
, p
);
2107 rc
= smk_curacc(skp
, access
, &ad
);
2108 rc
= smk_bu_task(p
, access
, rc
);
2113 * smack_task_setpgid - Smack check on setting pgid
2114 * @p: the task object
2117 * Return 0 if write access is permitted
2119 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2121 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2125 * smack_task_getpgid - Smack access check for getpgid
2126 * @p: the object task
2128 * Returns 0 if current can read the object task, error code otherwise
2130 static int smack_task_getpgid(struct task_struct
*p
)
2132 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2136 * smack_task_getsid - Smack access check for getsid
2137 * @p: the object task
2139 * Returns 0 if current can read the object task, error code otherwise
2141 static int smack_task_getsid(struct task_struct
*p
)
2143 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2147 * smack_task_getsecid - get the secid of the task
2148 * @p: the object task
2149 * @secid: where to put the result
2151 * Sets the secid to contain a u32 version of the smack label.
2153 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2155 struct smack_known
*skp
= smk_of_task_struct(p
);
2157 *secid
= skp
->smk_secid
;
2161 * smack_task_setnice - Smack check on setting nice
2162 * @p: the task object
2165 * Return 0 if write access is permitted
2167 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2169 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2173 * smack_task_setioprio - Smack check on setting ioprio
2174 * @p: the task object
2177 * Return 0 if write access is permitted
2179 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2181 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2185 * smack_task_getioprio - Smack check on reading ioprio
2186 * @p: the task object
2188 * Return 0 if read access is permitted
2190 static int smack_task_getioprio(struct task_struct
*p
)
2192 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2196 * smack_task_setscheduler - Smack check on setting scheduler
2197 * @p: the task object
2201 * Return 0 if read access is permitted
2203 static int smack_task_setscheduler(struct task_struct
*p
)
2205 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2209 * smack_task_getscheduler - Smack check on reading scheduler
2210 * @p: the task object
2212 * Return 0 if read access is permitted
2214 static int smack_task_getscheduler(struct task_struct
*p
)
2216 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2220 * smack_task_movememory - Smack check on moving memory
2221 * @p: the task object
2223 * Return 0 if write access is permitted
2225 static int smack_task_movememory(struct task_struct
*p
)
2227 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2231 * smack_task_kill - Smack check on signal delivery
2232 * @p: the task object
2235 * @secid: identifies the smack to use in lieu of current's
2237 * Return 0 if write access is permitted
2239 * The secid behavior is an artifact of an SELinux hack
2240 * in the USB code. Someday it may go away.
2242 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2245 struct smk_audit_info ad
;
2246 struct smack_known
*skp
;
2247 struct smack_known
*tkp
= smk_of_task_struct(p
);
2251 return 0; /* null signal; existence test */
2253 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2254 smk_ad_setfield_u_tsk(&ad
, p
);
2256 * Sending a signal requires that the sender
2257 * can write the receiver.
2260 rc
= smk_curacc(tkp
, MAY_DELIVER
, &ad
);
2261 rc
= smk_bu_task(p
, MAY_DELIVER
, rc
);
2265 * If the secid isn't 0 we're dealing with some USB IO
2266 * specific behavior. This is not clean. For one thing
2267 * we can't take privilege into account.
2269 skp
= smack_from_secid(secid
);
2270 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, &ad
);
2271 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_DELIVER
, rc
);
2276 * smack_task_wait - Smack access check for waiting
2277 * @p: task to wait for
2281 static int smack_task_wait(struct task_struct
*p
)
2284 * Allow the operation to succeed.
2286 * In userless environments (e.g. phones) programs
2287 * get marked with SMACK64EXEC and even if the parent
2288 * and child shouldn't be talking the parent still
2289 * may expect to know when the child exits.
2295 * smack_task_to_inode - copy task smack into the inode blob
2296 * @p: task to copy from
2297 * @inode: inode to copy to
2299 * Sets the smack pointer in the inode security blob
2301 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2303 struct inode_smack
*isp
= inode
->i_security
;
2304 struct smack_known
*skp
= smk_of_task_struct(p
);
2306 isp
->smk_inode
= skp
;
2314 * smack_sk_alloc_security - Allocate a socket blob
2317 * @gfp_flags: memory allocation flags
2319 * Assign Smack pointers to current
2321 * Returns 0 on success, -ENOMEM is there's no memory
2323 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2325 struct smack_known
*skp
= smk_of_current();
2326 struct socket_smack
*ssp
;
2328 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2333 * Sockets created by kernel threads receive web label.
2335 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2336 ssp
->smk_in
= &smack_known_web
;
2337 ssp
->smk_out
= &smack_known_web
;
2342 ssp
->smk_packet
= NULL
;
2344 sk
->sk_security
= ssp
;
2350 * smack_sk_free_security - Free a socket blob
2353 * Clears the blob pointer
2355 static void smack_sk_free_security(struct sock
*sk
)
2357 kfree(sk
->sk_security
);
2361 * smack_ipv4host_label - check host based restrictions
2362 * @sip: the object end
2364 * looks for host based access restrictions
2366 * This version will only be appropriate for really small sets of single label
2367 * hosts. The caller is responsible for ensuring that the RCU read lock is
2368 * taken before calling this function.
2370 * Returns the label of the far end or NULL if it's not special.
2372 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2374 struct smk_net4addr
*snp
;
2375 struct in_addr
*siap
= &sip
->sin_addr
;
2377 if (siap
->s_addr
== 0)
2380 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2382 * we break after finding the first match because
2383 * the list is sorted from longest to shortest mask
2384 * so we have found the most specific match
2386 if (snp
->smk_host
.s_addr
==
2387 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2388 return snp
->smk_label
;
2393 #if IS_ENABLED(CONFIG_IPV6)
2395 * smk_ipv6_localhost - Check for local ipv6 host address
2398 * Returns boolean true if this is the localhost address
2400 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2402 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2403 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2405 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2406 ntohs(be16p
[7]) == 1)
2412 * smack_ipv6host_label - check host based restrictions
2413 * @sip: the object end
2415 * looks for host based access restrictions
2417 * This version will only be appropriate for really small sets of single label
2418 * hosts. The caller is responsible for ensuring that the RCU read lock is
2419 * taken before calling this function.
2421 * Returns the label of the far end or NULL if it's not special.
2423 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2425 struct smk_net6addr
*snp
;
2426 struct in6_addr
*sap
= &sip
->sin6_addr
;
2431 * It's local. Don't look for a host label.
2433 if (smk_ipv6_localhost(sip
))
2436 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2438 * If the label is NULL the entry has
2439 * been renounced. Ignore it.
2441 if (snp
->smk_label
== NULL
)
2444 * we break after finding the first match because
2445 * the list is sorted from longest to shortest mask
2446 * so we have found the most specific match
2448 for (found
= 1, i
= 0; i
< 8; i
++) {
2449 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2450 snp
->smk_host
.s6_addr16
[i
]) {
2456 return snp
->smk_label
;
2461 #endif /* CONFIG_IPV6 */
2464 * smack_netlabel - Set the secattr on a socket
2466 * @labeled: socket label scheme
2468 * Convert the outbound smack value (smk_out) to a
2469 * secattr and attach it to the socket.
2471 * Returns 0 on success or an error code
2473 static int smack_netlabel(struct sock
*sk
, int labeled
)
2475 struct smack_known
*skp
;
2476 struct socket_smack
*ssp
= sk
->sk_security
;
2480 * Usually the netlabel code will handle changing the
2481 * packet labeling based on the label.
2482 * The case of a single label host is different, because
2483 * a single label host should never get a labeled packet
2484 * even though the label is usually associated with a packet
2488 bh_lock_sock_nested(sk
);
2490 if (ssp
->smk_out
== smack_net_ambient
||
2491 labeled
== SMACK_UNLABELED_SOCKET
)
2492 netlbl_sock_delattr(sk
);
2495 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2505 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2507 * @sap: the destination address
2509 * Set the correct secattr for the given socket based on the destination
2510 * address and perform any outbound access checks needed.
2512 * Returns 0 on success or an error code.
2515 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2517 struct smack_known
*skp
;
2520 struct smack_known
*hkp
;
2521 struct socket_smack
*ssp
= sk
->sk_security
;
2522 struct smk_audit_info ad
;
2525 hkp
= smack_ipv4host_label(sap
);
2528 struct lsm_network_audit net
;
2530 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2531 ad
.a
.u
.net
->family
= sap
->sin_family
;
2532 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2533 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2535 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2537 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2538 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2540 sk_lbl
= SMACK_CIPSO_SOCKET
;
2547 return smack_netlabel(sk
, sk_lbl
);
2550 #if IS_ENABLED(CONFIG_IPV6)
2552 * smk_ipv6_check - check Smack access
2553 * @subject: subject Smack label
2554 * @object: object Smack label
2556 * @act: the action being taken
2558 * Check an IPv6 access
2560 static int smk_ipv6_check(struct smack_known
*subject
,
2561 struct smack_known
*object
,
2562 struct sockaddr_in6
*address
, int act
)
2565 struct lsm_network_audit net
;
2567 struct smk_audit_info ad
;
2571 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2572 ad
.a
.u
.net
->family
= PF_INET6
;
2573 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2574 if (act
== SMK_RECEIVING
)
2575 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2577 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2579 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2580 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2583 #endif /* CONFIG_IPV6 */
2585 #ifdef SMACK_IPV6_PORT_LABELING
2587 * smk_ipv6_port_label - Smack port access table management
2591 * Create or update the port list entry
2593 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2595 struct sock
*sk
= sock
->sk
;
2596 struct sockaddr_in6
*addr6
;
2597 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2598 struct smk_port_label
*spp
;
2599 unsigned short port
= 0;
2601 if (address
== NULL
) {
2603 * This operation is changing the Smack information
2604 * on the bound socket. Take the changes to the port
2608 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2609 if (sk
!= spp
->smk_sock
)
2611 spp
->smk_in
= ssp
->smk_in
;
2612 spp
->smk_out
= ssp
->smk_out
;
2617 * A NULL address is only used for updating existing
2618 * bound entries. If there isn't one, it's OK.
2624 addr6
= (struct sockaddr_in6
*)address
;
2625 port
= ntohs(addr6
->sin6_port
);
2627 * This is a special case that is safely ignored.
2633 * Look for an existing port list entry.
2634 * This is an indication that a port is getting reused.
2637 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2638 if (spp
->smk_port
!= port
)
2640 spp
->smk_port
= port
;
2642 spp
->smk_in
= ssp
->smk_in
;
2643 spp
->smk_out
= ssp
->smk_out
;
2649 * A new port entry is required.
2651 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2655 spp
->smk_port
= port
;
2657 spp
->smk_in
= ssp
->smk_in
;
2658 spp
->smk_out
= ssp
->smk_out
;
2660 mutex_lock(&smack_ipv6_lock
);
2661 list_add_rcu(&spp
->list
, &smk_ipv6_port_list
);
2662 mutex_unlock(&smack_ipv6_lock
);
2667 * smk_ipv6_port_check - check Smack port access
2671 * Create or update the port list entry
2673 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2676 struct smk_port_label
*spp
;
2677 struct socket_smack
*ssp
= sk
->sk_security
;
2678 struct smack_known
*skp
= NULL
;
2679 unsigned short port
;
2680 struct smack_known
*object
;
2682 if (act
== SMK_RECEIVING
) {
2683 skp
= smack_ipv6host_label(address
);
2684 object
= ssp
->smk_in
;
2687 object
= smack_ipv6host_label(address
);
2691 * The other end is a single label host.
2693 if (skp
!= NULL
&& object
!= NULL
)
2694 return smk_ipv6_check(skp
, object
, address
, act
);
2696 skp
= smack_net_ambient
;
2698 object
= smack_net_ambient
;
2701 * It's remote, so port lookup does no good.
2703 if (!smk_ipv6_localhost(address
))
2704 return smk_ipv6_check(skp
, object
, address
, act
);
2707 * It's local so the send check has to have passed.
2709 if (act
== SMK_RECEIVING
)
2712 port
= ntohs(address
->sin6_port
);
2714 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2715 if (spp
->smk_port
!= port
)
2717 object
= spp
->smk_in
;
2718 if (act
== SMK_CONNECTING
)
2719 ssp
->smk_packet
= spp
->smk_out
;
2724 return smk_ipv6_check(skp
, object
, address
, act
);
2726 #endif /* SMACK_IPV6_PORT_LABELING */
2729 * smack_inode_setsecurity - set smack xattrs
2730 * @inode: the object
2731 * @name: attribute name
2732 * @value: attribute value
2733 * @size: size of the attribute
2736 * Sets the named attribute in the appropriate blob
2738 * Returns 0 on success, or an error code
2740 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2741 const void *value
, size_t size
, int flags
)
2743 struct smack_known
*skp
;
2744 struct inode_smack
*nsp
= inode
->i_security
;
2745 struct socket_smack
*ssp
;
2746 struct socket
*sock
;
2749 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2752 skp
= smk_import_entry(value
, size
);
2754 return PTR_ERR(skp
);
2756 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2757 nsp
->smk_inode
= skp
;
2758 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2762 * The rest of the Smack xattrs are only on sockets.
2764 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2767 sock
= SOCKET_I(inode
);
2768 if (sock
== NULL
|| sock
->sk
== NULL
)
2771 ssp
= sock
->sk
->sk_security
;
2773 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2775 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2777 if (sock
->sk
->sk_family
== PF_INET
) {
2778 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2781 "Smack: \"%s\" netlbl error %d.\n",
2787 #ifdef SMACK_IPV6_PORT_LABELING
2788 if (sock
->sk
->sk_family
== PF_INET6
)
2789 smk_ipv6_port_label(sock
, NULL
);
2796 * smack_socket_post_create - finish socket setup
2798 * @family: protocol family
2803 * Sets the netlabel information on the socket
2805 * Returns 0 on success, and error code otherwise
2807 static int smack_socket_post_create(struct socket
*sock
, int family
,
2808 int type
, int protocol
, int kern
)
2810 struct socket_smack
*ssp
;
2812 if (sock
->sk
== NULL
)
2816 * Sockets created by kernel threads receive web label.
2818 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2819 ssp
= sock
->sk
->sk_security
;
2820 ssp
->smk_in
= &smack_known_web
;
2821 ssp
->smk_out
= &smack_known_web
;
2824 if (family
!= PF_INET
)
2827 * Set the outbound netlbl.
2829 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2832 #ifdef SMACK_IPV6_PORT_LABELING
2834 * smack_socket_bind - record port binding information.
2836 * @address: the port address
2837 * @addrlen: size of the address
2839 * Records the label bound to a port.
2843 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2846 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2847 smk_ipv6_port_label(sock
, address
);
2850 #endif /* SMACK_IPV6_PORT_LABELING */
2853 * smack_socket_connect - connect access check
2855 * @sap: the other end
2856 * @addrlen: size of sap
2858 * Verifies that a connection may be possible
2860 * Returns 0 on success, and error code otherwise
2862 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2866 #if IS_ENABLED(CONFIG_IPV6)
2867 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2869 #ifdef SMACK_IPV6_SECMARK_LABELING
2870 struct smack_known
*rsp
;
2871 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2874 if (sock
->sk
== NULL
)
2877 switch (sock
->sk
->sk_family
) {
2879 if (addrlen
< sizeof(struct sockaddr_in
))
2881 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2884 if (addrlen
< sizeof(struct sockaddr_in6
))
2886 #ifdef SMACK_IPV6_SECMARK_LABELING
2887 rsp
= smack_ipv6host_label(sip
);
2889 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2892 #ifdef SMACK_IPV6_PORT_LABELING
2893 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2901 * smack_flags_to_may - convert S_ to MAY_ values
2902 * @flags: the S_ value
2904 * Returns the equivalent MAY_ value
2906 static int smack_flags_to_may(int flags
)
2910 if (flags
& S_IRUGO
)
2912 if (flags
& S_IWUGO
)
2914 if (flags
& S_IXUGO
)
2921 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2926 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2928 struct smack_known
*skp
= smk_of_current();
2930 msg
->security
= skp
;
2935 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2938 * Clears the blob pointer
2940 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2942 msg
->security
= NULL
;
2946 * smack_of_shm - the smack pointer for the shm
2949 * Returns a pointer to the smack value
2951 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2953 return (struct smack_known
*)shp
->shm_perm
.security
;
2957 * smack_shm_alloc_security - Set the security blob for shm
2962 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2964 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2965 struct smack_known
*skp
= smk_of_current();
2967 isp
->security
= skp
;
2972 * smack_shm_free_security - Clear the security blob for shm
2975 * Clears the blob pointer
2977 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2979 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2981 isp
->security
= NULL
;
2985 * smk_curacc_shm : check if current has access on shm
2987 * @access : access requested
2989 * Returns 0 if current has the requested access, error code otherwise
2991 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2993 struct smack_known
*ssp
= smack_of_shm(shp
);
2994 struct smk_audit_info ad
;
2998 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2999 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
3001 rc
= smk_curacc(ssp
, access
, &ad
);
3002 rc
= smk_bu_current("shm", ssp
, access
, rc
);
3007 * smack_shm_associate - Smack access check for shm
3009 * @shmflg: access requested
3011 * Returns 0 if current has the requested access, error code otherwise
3013 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
3017 may
= smack_flags_to_may(shmflg
);
3018 return smk_curacc_shm(shp
, may
);
3022 * smack_shm_shmctl - Smack access check for shm
3024 * @cmd: what it wants to do
3026 * Returns 0 if current has the requested access, error code otherwise
3028 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
3041 may
= MAY_READWRITE
;
3046 * System level information.
3052 return smk_curacc_shm(shp
, may
);
3056 * smack_shm_shmat - Smack access for shmat
3059 * @shmflg: access requested
3061 * Returns 0 if current has the requested access, error code otherwise
3063 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
3068 may
= smack_flags_to_may(shmflg
);
3069 return smk_curacc_shm(shp
, may
);
3073 * smack_of_sem - the smack pointer for the sem
3076 * Returns a pointer to the smack value
3078 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
3080 return (struct smack_known
*)sma
->sem_perm
.security
;
3084 * smack_sem_alloc_security - Set the security blob for sem
3089 static int smack_sem_alloc_security(struct sem_array
*sma
)
3091 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3092 struct smack_known
*skp
= smk_of_current();
3094 isp
->security
= skp
;
3099 * smack_sem_free_security - Clear the security blob for sem
3102 * Clears the blob pointer
3104 static void smack_sem_free_security(struct sem_array
*sma
)
3106 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3108 isp
->security
= NULL
;
3112 * smk_curacc_sem : check if current has access on sem
3114 * @access : access requested
3116 * Returns 0 if current has the requested access, error code otherwise
3118 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3120 struct smack_known
*ssp
= smack_of_sem(sma
);
3121 struct smk_audit_info ad
;
3125 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3126 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3128 rc
= smk_curacc(ssp
, access
, &ad
);
3129 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3134 * smack_sem_associate - Smack access check for sem
3136 * @semflg: access requested
3138 * Returns 0 if current has the requested access, error code otherwise
3140 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3144 may
= smack_flags_to_may(semflg
);
3145 return smk_curacc_sem(sma
, may
);
3149 * smack_sem_shmctl - Smack access check for sem
3151 * @cmd: what it wants to do
3153 * Returns 0 if current has the requested access, error code otherwise
3155 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3173 may
= MAY_READWRITE
;
3178 * System level information
3185 return smk_curacc_sem(sma
, may
);
3189 * smack_sem_semop - Smack checks of semaphore operations
3195 * Treated as read and write in all cases.
3197 * Returns 0 if access is allowed, error code otherwise
3199 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3200 unsigned nsops
, int alter
)
3202 return smk_curacc_sem(sma
, MAY_READWRITE
);
3206 * smack_msg_alloc_security - Set the security blob for msg
3211 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3213 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3214 struct smack_known
*skp
= smk_of_current();
3216 kisp
->security
= skp
;
3221 * smack_msg_free_security - Clear the security blob for msg
3224 * Clears the blob pointer
3226 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3228 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3230 kisp
->security
= NULL
;
3234 * smack_of_msq - the smack pointer for the msq
3237 * Returns a pointer to the smack label entry
3239 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3241 return (struct smack_known
*)msq
->q_perm
.security
;
3245 * smk_curacc_msq : helper to check if current has access on msq
3247 * @access : access requested
3249 * return 0 if current has access, error otherwise
3251 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3253 struct smack_known
*msp
= smack_of_msq(msq
);
3254 struct smk_audit_info ad
;
3258 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3259 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3261 rc
= smk_curacc(msp
, access
, &ad
);
3262 rc
= smk_bu_current("msq", msp
, access
, rc
);
3267 * smack_msg_queue_associate - Smack access check for msg_queue
3269 * @msqflg: access requested
3271 * Returns 0 if current has the requested access, error code otherwise
3273 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3277 may
= smack_flags_to_may(msqflg
);
3278 return smk_curacc_msq(msq
, may
);
3282 * smack_msg_queue_msgctl - Smack access check for msg_queue
3284 * @cmd: what it wants to do
3286 * Returns 0 if current has the requested access, error code otherwise
3288 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3299 may
= MAY_READWRITE
;
3304 * System level information
3311 return smk_curacc_msq(msq
, may
);
3315 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3318 * @msqflg: access requested
3320 * Returns 0 if current has the requested access, error code otherwise
3322 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3327 may
= smack_flags_to_may(msqflg
);
3328 return smk_curacc_msq(msq
, may
);
3332 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3339 * Returns 0 if current has read and write access, error code otherwise
3341 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3342 struct task_struct
*target
, long type
, int mode
)
3344 return smk_curacc_msq(msq
, MAY_READWRITE
);
3348 * smack_ipc_permission - Smack access for ipc_permission()
3349 * @ipp: the object permissions
3350 * @flag: access requested
3352 * Returns 0 if current has read and write access, error code otherwise
3354 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3356 struct smack_known
*iskp
= ipp
->security
;
3357 int may
= smack_flags_to_may(flag
);
3358 struct smk_audit_info ad
;
3362 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3363 ad
.a
.u
.ipc_id
= ipp
->id
;
3365 rc
= smk_curacc(iskp
, may
, &ad
);
3366 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3371 * smack_ipc_getsecid - Extract smack security id
3372 * @ipp: the object permissions
3373 * @secid: where result will be saved
3375 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3377 struct smack_known
*iskp
= ipp
->security
;
3379 *secid
= iskp
->smk_secid
;
3383 * smack_d_instantiate - Make sure the blob is correct on an inode
3384 * @opt_dentry: dentry where inode will be attached
3385 * @inode: the object
3387 * Set the inode's security blob if it hasn't been done already.
3389 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3391 struct super_block
*sbp
;
3392 struct superblock_smack
*sbsp
;
3393 struct inode_smack
*isp
;
3394 struct smack_known
*skp
;
3395 struct smack_known
*ckp
= smk_of_current();
3396 struct smack_known
*final
;
3397 char trattr
[TRANS_TRUE_SIZE
];
3405 isp
= inode
->i_security
;
3407 mutex_lock(&isp
->smk_lock
);
3409 * If the inode is already instantiated
3410 * take the quick way out
3412 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3416 sbsp
= sbp
->s_security
;
3418 * We're going to use the superblock default label
3419 * if there's no label on the file.
3421 final
= sbsp
->smk_default
;
3424 * If this is the root inode the superblock
3425 * may be in the process of initialization.
3426 * If that is the case use the root value out
3427 * of the superblock.
3429 if (opt_dentry
->d_parent
== opt_dentry
) {
3430 switch (sbp
->s_magic
) {
3431 case CGROUP_SUPER_MAGIC
:
3433 * The cgroup filesystem is never mounted,
3434 * so there's no opportunity to set the mount
3437 sbsp
->smk_root
= &smack_known_star
;
3438 sbsp
->smk_default
= &smack_known_star
;
3439 isp
->smk_inode
= sbsp
->smk_root
;
3443 * What about shmem/tmpfs anonymous files with dentry
3444 * obtained from d_alloc_pseudo()?
3446 isp
->smk_inode
= smk_of_current();
3449 isp
->smk_inode
= smk_of_current();
3452 isp
->smk_inode
= sbsp
->smk_root
;
3455 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3460 * This is pretty hackish.
3461 * Casey says that we shouldn't have to do
3462 * file system specific code, but it does help
3463 * with keeping it simple.
3465 switch (sbp
->s_magic
) {
3469 case CGROUP_SUPER_MAGIC
:
3471 * Casey says that it's a little embarrassing
3472 * that the smack file system doesn't do
3473 * extended attributes.
3475 * Casey says pipes are easy (?)
3477 * Socket access is controlled by the socket
3478 * structures associated with the task involved.
3480 * Cgroupfs is special
3482 final
= &smack_known_star
;
3484 case DEVPTS_SUPER_MAGIC
:
3486 * devpts seems content with the label of the task.
3487 * Programs that change smack have to treat the
3492 case PROC_SUPER_MAGIC
:
3494 * Casey says procfs appears not to care.
3495 * The superblock default suffices.
3500 * Device labels should come from the filesystem,
3501 * but watch out, because they're volitile,
3502 * getting recreated on every reboot.
3504 final
= &smack_known_star
;
3508 * If a smack value has been set we want to use it,
3509 * but since tmpfs isn't giving us the opportunity
3510 * to set mount options simulate setting the
3511 * superblock default.
3515 * This isn't an understood special case.
3516 * Get the value from the xattr.
3520 * UNIX domain sockets use lower level socket data.
3522 if (S_ISSOCK(inode
->i_mode
)) {
3523 final
= &smack_known_star
;
3527 * No xattr support means, alas, no SMACK label.
3528 * Use the aforeapplied default.
3529 * It would be curious if the label of the task
3530 * does not match that assigned.
3532 if (!(inode
->i_opflags
& IOP_XATTR
))
3535 * Get the dentry for xattr.
3537 dp
= dget(opt_dentry
);
3538 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3539 if (!IS_ERR_OR_NULL(skp
))
3543 * Transmuting directory
3545 if (S_ISDIR(inode
->i_mode
)) {
3547 * If this is a new directory and the label was
3548 * transmuted when the inode was initialized
3549 * set the transmute attribute on the directory
3550 * and mark the inode.
3552 * If there is a transmute attribute on the
3553 * directory mark the inode.
3555 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3556 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3557 rc
= __vfs_setxattr(dp
, inode
,
3558 XATTR_NAME_SMACKTRANSMUTE
,
3559 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3562 rc
= __vfs_getxattr(dp
, inode
,
3563 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3565 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3566 TRANS_TRUE_SIZE
) != 0)
3570 transflag
= SMK_INODE_TRANSMUTE
;
3573 * Don't let the exec or mmap label be "*" or "@".
3575 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3576 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3577 skp
== &smack_known_web
)
3579 isp
->smk_task
= skp
;
3581 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3582 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3583 skp
== &smack_known_web
)
3585 isp
->smk_mmap
= skp
;
3592 isp
->smk_inode
= ckp
;
3594 isp
->smk_inode
= final
;
3596 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3599 mutex_unlock(&isp
->smk_lock
);
3604 * smack_getprocattr - Smack process attribute access
3605 * @p: the object task
3606 * @name: the name of the attribute in /proc/.../attr
3607 * @value: where to put the result
3609 * Places a copy of the task Smack into value
3611 * Returns the length of the smack label or an error code
3613 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3615 struct smack_known
*skp
= smk_of_task_struct(p
);
3619 if (strcmp(name
, "current") != 0)
3622 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3632 * smack_setprocattr - Smack process attribute setting
3633 * @p: the object task
3634 * @name: the name of the attribute in /proc/.../attr
3635 * @value: the value to set
3636 * @size: the size of the value
3638 * Sets the Smack value of the task. Only setting self
3639 * is permitted and only with privilege
3641 * Returns the length of the smack label or an error code
3643 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3644 void *value
, size_t size
)
3646 struct task_smack
*tsp
= current_security();
3648 struct smack_known
*skp
;
3649 struct smack_known_list_elem
*sklep
;
3653 * Changing another process' Smack value is too dangerous
3654 * and supports no sane use case.
3659 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3662 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3665 if (strcmp(name
, "current") != 0)
3668 skp
= smk_import_entry(value
, size
);
3670 return PTR_ERR(skp
);
3673 * No process is ever allowed the web ("@") label
3674 * and the star ("*") label.
3676 if (skp
== &smack_known_web
|| skp
== &smack_known_star
)
3679 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3681 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3682 if (sklep
->smk_label
== skp
) {
3690 new = prepare_creds();
3694 tsp
= new->security
;
3695 tsp
->smk_task
= skp
;
3697 * process can change its label only once
3699 smk_destroy_label_list(&tsp
->smk_relabel
);
3706 * smack_unix_stream_connect - Smack access on UDS
3708 * @other: the other sock
3711 * Return 0 if a subject with the smack of sock could access
3712 * an object with the smack of other, otherwise an error code
3714 static int smack_unix_stream_connect(struct sock
*sock
,
3715 struct sock
*other
, struct sock
*newsk
)
3717 struct smack_known
*skp
;
3718 struct smack_known
*okp
;
3719 struct socket_smack
*ssp
= sock
->sk_security
;
3720 struct socket_smack
*osp
= other
->sk_security
;
3721 struct socket_smack
*nsp
= newsk
->sk_security
;
3722 struct smk_audit_info ad
;
3725 struct lsm_network_audit net
;
3728 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3732 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3733 smk_ad_setfield_u_net_sk(&ad
, other
);
3735 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3736 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3740 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3741 rc
= smk_bu_note("UDS connect", okp
, skp
,
3747 * Cross reference the peer labels for SO_PEERSEC.
3750 nsp
->smk_packet
= ssp
->smk_out
;
3751 ssp
->smk_packet
= osp
->smk_out
;
3758 * smack_unix_may_send - Smack access on UDS
3760 * @other: the other socket
3762 * Return 0 if a subject with the smack of sock could access
3763 * an object with the smack of other, otherwise an error code
3765 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3767 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3768 struct socket_smack
*osp
= other
->sk
->sk_security
;
3769 struct smk_audit_info ad
;
3773 struct lsm_network_audit net
;
3775 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3776 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3779 if (smack_privileged(CAP_MAC_OVERRIDE
))
3782 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3783 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3788 * smack_socket_sendmsg - Smack check based on destination host
3791 * @size: the size of the message
3793 * Return 0 if the current subject can write to the destination host.
3794 * For IPv4 this is only a question if the destination is a single label host.
3795 * For IPv6 this is a check against the label of the port.
3797 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3800 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3801 #if IS_ENABLED(CONFIG_IPV6)
3802 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3804 #ifdef SMACK_IPV6_SECMARK_LABELING
3805 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3806 struct smack_known
*rsp
;
3811 * Perfectly reasonable for this to be NULL
3816 switch (sock
->sk
->sk_family
) {
3818 rc
= smack_netlabel_send(sock
->sk
, sip
);
3821 #ifdef SMACK_IPV6_SECMARK_LABELING
3822 rsp
= smack_ipv6host_label(sap
);
3824 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3827 #ifdef SMACK_IPV6_PORT_LABELING
3828 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3836 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3837 * @sap: netlabel secattr
3838 * @ssp: socket security information
3840 * Returns a pointer to a Smack label entry found on the label list.
3842 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3843 struct socket_smack
*ssp
)
3845 struct smack_known
*skp
;
3850 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3852 * Looks like a CIPSO packet.
3853 * If there are flags but no level netlabel isn't
3854 * behaving the way we expect it to.
3856 * Look it up in the label table
3857 * Without guidance regarding the smack value
3858 * for the packet fall back on the network
3862 list_for_each_entry(skp
, &smack_known_list
, list
) {
3863 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3866 * Compare the catsets. Use the netlbl APIs.
3868 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3869 if ((skp
->smk_netlabel
.flags
&
3870 NETLBL_SECATTR_MLS_CAT
) == 0)
3874 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3875 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3877 kcat
= netlbl_catmap_walk(
3878 skp
->smk_netlabel
.attr
.mls
.cat
,
3880 if (acat
< 0 || kcat
< 0)
3893 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3894 return &smack_known_web
;
3895 return &smack_known_star
;
3897 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0)
3899 * Looks like a fallback, which gives us a secid.
3901 return smack_from_secid(sap
->attr
.secid
);
3903 * Without guidance regarding the smack value
3904 * for the packet fall back on the network
3907 return smack_net_ambient
;
3910 #if IS_ENABLED(CONFIG_IPV6)
3911 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3915 int proto
= -EINVAL
;
3916 struct ipv6hdr _ipv6h
;
3917 struct ipv6hdr
*ip6
;
3919 struct tcphdr _tcph
, *th
;
3920 struct udphdr _udph
, *uh
;
3921 struct dccp_hdr _dccph
, *dh
;
3925 offset
= skb_network_offset(skb
);
3926 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3929 sip
->sin6_addr
= ip6
->saddr
;
3931 nexthdr
= ip6
->nexthdr
;
3932 offset
+= sizeof(_ipv6h
);
3933 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3940 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3942 sip
->sin6_port
= th
->source
;
3945 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3947 sip
->sin6_port
= uh
->source
;
3950 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3952 sip
->sin6_port
= dh
->dccph_sport
;
3957 #endif /* CONFIG_IPV6 */
3960 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3964 * Returns 0 if the packet should be delivered, an error code otherwise
3966 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3968 struct netlbl_lsm_secattr secattr
;
3969 struct socket_smack
*ssp
= sk
->sk_security
;
3970 struct smack_known
*skp
= NULL
;
3972 struct smk_audit_info ad
;
3974 struct lsm_network_audit net
;
3976 #if IS_ENABLED(CONFIG_IPV6)
3977 struct sockaddr_in6 sadd
;
3979 #endif /* CONFIG_IPV6 */
3981 switch (sk
->sk_family
) {
3983 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3985 * If there is a secmark use it rather than the CIPSO label.
3986 * If there is no secmark fall back to CIPSO.
3987 * The secmark is assumed to reflect policy better.
3989 if (skb
&& skb
->secmark
!= 0) {
3990 skp
= smack_from_secid(skb
->secmark
);
3993 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3995 * Translate what netlabel gave us.
3997 netlbl_secattr_init(&secattr
);
3999 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
4001 skp
= smack_from_secattr(&secattr
, ssp
);
4003 skp
= smack_net_ambient
;
4005 netlbl_secattr_destroy(&secattr
);
4007 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4011 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4012 ad
.a
.u
.net
->family
= sk
->sk_family
;
4013 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4014 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4017 * Receiving a packet requires that the other end
4018 * be able to write here. Read access is not required.
4019 * This is the simplist possible security model
4022 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4023 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
4026 netlbl_skbuff_err(skb
, sk
->sk_family
, rc
, 0);
4028 #if IS_ENABLED(CONFIG_IPV6)
4030 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
4031 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
4033 #ifdef SMACK_IPV6_SECMARK_LABELING
4034 if (skb
&& skb
->secmark
!= 0)
4035 skp
= smack_from_secid(skb
->secmark
);
4037 skp
= smack_ipv6host_label(&sadd
);
4039 skp
= smack_net_ambient
;
4041 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4042 ad
.a
.u
.net
->family
= sk
->sk_family
;
4043 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4044 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4045 #endif /* CONFIG_AUDIT */
4046 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4047 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4049 #endif /* SMACK_IPV6_SECMARK_LABELING */
4050 #ifdef SMACK_IPV6_PORT_LABELING
4051 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4052 #endif /* SMACK_IPV6_PORT_LABELING */
4054 #endif /* CONFIG_IPV6 */
4061 * smack_socket_getpeersec_stream - pull in packet label
4063 * @optval: user's destination
4064 * @optlen: size thereof
4067 * returns zero on success, an error code otherwise
4069 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4070 char __user
*optval
,
4071 int __user
*optlen
, unsigned len
)
4073 struct socket_smack
*ssp
;
4078 ssp
= sock
->sk
->sk_security
;
4079 if (ssp
->smk_packet
!= NULL
) {
4080 rcp
= ssp
->smk_packet
->smk_known
;
4081 slen
= strlen(rcp
) + 1;
4086 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4089 if (put_user(slen
, optlen
) != 0)
4097 * smack_socket_getpeersec_dgram - pull in packet label
4098 * @sock: the peer socket
4100 * @secid: pointer to where to put the secid of the packet
4102 * Sets the netlabel socket state on sk from parent
4104 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4105 struct sk_buff
*skb
, u32
*secid
)
4108 struct netlbl_lsm_secattr secattr
;
4109 struct socket_smack
*ssp
= NULL
;
4110 struct smack_known
*skp
;
4111 int family
= PF_UNSPEC
;
4112 u32 s
= 0; /* 0 is the invalid secid */
4116 if (skb
->protocol
== htons(ETH_P_IP
))
4118 #if IS_ENABLED(CONFIG_IPV6)
4119 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4121 #endif /* CONFIG_IPV6 */
4123 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4124 family
= sock
->sk
->sk_family
;
4128 ssp
= sock
->sk
->sk_security
;
4129 s
= ssp
->smk_out
->smk_secid
;
4132 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4138 * Translate what netlabel gave us.
4140 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4141 ssp
= sock
->sk
->sk_security
;
4142 netlbl_secattr_init(&secattr
);
4143 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4145 skp
= smack_from_secattr(&secattr
, ssp
);
4148 netlbl_secattr_destroy(&secattr
);
4151 #ifdef SMACK_IPV6_SECMARK_LABELING
4163 * smack_sock_graft - Initialize a newly created socket with an existing sock
4165 * @parent: parent socket
4167 * Set the smk_{in,out} state of an existing sock based on the process that
4168 * is creating the new socket.
4170 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4172 struct socket_smack
*ssp
;
4173 struct smack_known
*skp
= smk_of_current();
4176 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4179 ssp
= sk
->sk_security
;
4182 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4186 * smack_inet_conn_request - Smack access check on connect
4187 * @sk: socket involved
4191 * Returns 0 if a task with the packet label could write to
4192 * the socket, otherwise an error code
4194 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4195 struct request_sock
*req
)
4197 u16 family
= sk
->sk_family
;
4198 struct smack_known
*skp
;
4199 struct socket_smack
*ssp
= sk
->sk_security
;
4200 struct netlbl_lsm_secattr secattr
;
4201 struct sockaddr_in addr
;
4203 struct smack_known
*hskp
;
4205 struct smk_audit_info ad
;
4207 struct lsm_network_audit net
;
4210 #if IS_ENABLED(CONFIG_IPV6)
4211 if (family
== PF_INET6
) {
4213 * Handle mapped IPv4 packets arriving
4214 * via IPv6 sockets. Don't set up netlabel
4215 * processing on IPv6.
4217 if (skb
->protocol
== htons(ETH_P_IP
))
4222 #endif /* CONFIG_IPV6 */
4224 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4226 * If there is a secmark use it rather than the CIPSO label.
4227 * If there is no secmark fall back to CIPSO.
4228 * The secmark is assumed to reflect policy better.
4230 if (skb
&& skb
->secmark
!= 0) {
4231 skp
= smack_from_secid(skb
->secmark
);
4234 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4236 netlbl_secattr_init(&secattr
);
4237 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4239 skp
= smack_from_secattr(&secattr
, ssp
);
4241 skp
= &smack_known_huh
;
4242 netlbl_secattr_destroy(&secattr
);
4244 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4249 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4250 ad
.a
.u
.net
->family
= family
;
4251 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4252 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4255 * Receiving a packet requires that the other end be able to write
4256 * here. Read access is not required.
4258 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4259 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4264 * Save the peer's label in the request_sock so we can later setup
4265 * smk_packet in the child socket so that SO_PEERCRED can report it.
4267 req
->peer_secid
= skp
->smk_secid
;
4270 * We need to decide if we want to label the incoming connection here
4271 * if we do we only need to label the request_sock and the stack will
4272 * propagate the wire-label to the sock when it is created.
4275 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4277 hskp
= smack_ipv4host_label(&addr
);
4281 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4283 netlbl_req_delattr(req
);
4289 * smack_inet_csk_clone - Copy the connection information to the new socket
4290 * @sk: the new socket
4291 * @req: the connection's request_sock
4293 * Transfer the connection's peer label to the newly created socket.
4295 static void smack_inet_csk_clone(struct sock
*sk
,
4296 const struct request_sock
*req
)
4298 struct socket_smack
*ssp
= sk
->sk_security
;
4299 struct smack_known
*skp
;
4301 if (req
->peer_secid
!= 0) {
4302 skp
= smack_from_secid(req
->peer_secid
);
4303 ssp
->smk_packet
= skp
;
4305 ssp
->smk_packet
= NULL
;
4309 * Key management security hooks
4311 * Casey has not tested key support very heavily.
4312 * The permission check is most likely too restrictive.
4313 * If you care about keys please have a look.
4318 * smack_key_alloc - Set the key security blob
4320 * @cred: the credentials to use
4323 * No allocation required
4327 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4328 unsigned long flags
)
4330 struct smack_known
*skp
= smk_of_task(cred
->security
);
4332 key
->security
= skp
;
4337 * smack_key_free - Clear the key security blob
4340 * Clear the blob pointer
4342 static void smack_key_free(struct key
*key
)
4344 key
->security
= NULL
;
4348 * smack_key_permission - Smack access on a key
4349 * @key_ref: gets to the object
4350 * @cred: the credentials to use
4351 * @perm: requested key permissions
4353 * Return 0 if the task has read and write to the object,
4354 * an error code otherwise
4356 static int smack_key_permission(key_ref_t key_ref
,
4357 const struct cred
*cred
, unsigned perm
)
4360 struct smk_audit_info ad
;
4361 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4365 keyp
= key_ref_to_ptr(key_ref
);
4369 * If the key hasn't been initialized give it access so that
4372 if (keyp
->security
== NULL
)
4375 * This should not occur
4380 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4381 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4382 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4384 if (perm
& KEY_NEED_READ
)
4386 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4387 request
= MAY_WRITE
;
4388 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4389 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4394 * smack_key_getsecurity - Smack label tagging the key
4395 * @key points to the key to be queried
4396 * @_buffer points to a pointer that should be set to point to the
4397 * resulting string (if no label or an error occurs).
4398 * Return the length of the string (including terminating NUL) or -ve if
4400 * May also return 0 (and a NULL buffer pointer) if there is no label.
4402 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4404 struct smack_known
*skp
= key
->security
;
4408 if (key
->security
== NULL
) {
4413 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4416 length
= strlen(copy
) + 1;
4422 #endif /* CONFIG_KEYS */
4427 * Audit requires a unique representation of each Smack specific
4428 * rule. This unique representation is used to distinguish the
4429 * object to be audited from remaining kernel objects and also
4430 * works as a glue between the audit hooks.
4432 * Since repository entries are added but never deleted, we'll use
4433 * the smack_known label address related to the given audit rule as
4434 * the needed unique representation. This also better fits the smack
4435 * model where nearly everything is a label.
4440 * smack_audit_rule_init - Initialize a smack audit rule
4441 * @field: audit rule fields given from user-space (audit.h)
4442 * @op: required testing operator (=, !=, >, <, ...)
4443 * @rulestr: smack label to be audited
4444 * @vrule: pointer to save our own audit rule representation
4446 * Prepare to audit cases where (@field @op @rulestr) is true.
4447 * The label to be audited is created if necessay.
4449 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4451 struct smack_known
*skp
;
4452 char **rule
= (char **)vrule
;
4455 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4458 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4461 skp
= smk_import_entry(rulestr
, 0);
4463 return PTR_ERR(skp
);
4465 *rule
= skp
->smk_known
;
4471 * smack_audit_rule_known - Distinguish Smack audit rules
4472 * @krule: rule of interest, in Audit kernel representation format
4474 * This is used to filter Smack rules from remaining Audit ones.
4475 * If it's proved that this rule belongs to us, the
4476 * audit_rule_match hook will be called to do the final judgement.
4478 static int smack_audit_rule_known(struct audit_krule
*krule
)
4480 struct audit_field
*f
;
4483 for (i
= 0; i
< krule
->field_count
; i
++) {
4484 f
= &krule
->fields
[i
];
4486 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4494 * smack_audit_rule_match - Audit given object ?
4495 * @secid: security id for identifying the object to test
4496 * @field: audit rule flags given from user-space
4497 * @op: required testing operator
4498 * @vrule: smack internal rule presentation
4499 * @actx: audit context associated with the check
4501 * The core Audit hook. It's used to take the decision of
4502 * whether to audit or not to audit a given object.
4504 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4505 struct audit_context
*actx
)
4507 struct smack_known
*skp
;
4510 if (unlikely(!rule
)) {
4511 WARN_ONCE(1, "Smack: missing rule\n");
4515 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4518 skp
= smack_from_secid(secid
);
4521 * No need to do string comparisons. If a match occurs,
4522 * both pointers will point to the same smack_known
4525 if (op
== Audit_equal
)
4526 return (rule
== skp
->smk_known
);
4527 if (op
== Audit_not_equal
)
4528 return (rule
!= skp
->smk_known
);
4534 * There is no need for a smack_audit_rule_free hook.
4535 * No memory was allocated.
4538 #endif /* CONFIG_AUDIT */
4541 * smack_ismaclabel - check if xattr @name references a smack MAC label
4542 * @name: Full xattr name to check.
4544 static int smack_ismaclabel(const char *name
)
4546 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4551 * smack_secid_to_secctx - return the smack label for a secid
4552 * @secid: incoming integer
4553 * @secdata: destination
4554 * @seclen: how long it is
4556 * Exists for networking code.
4558 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4560 struct smack_known
*skp
= smack_from_secid(secid
);
4563 *secdata
= skp
->smk_known
;
4564 *seclen
= strlen(skp
->smk_known
);
4569 * smack_secctx_to_secid - return the secid for a smack label
4570 * @secdata: smack label
4571 * @seclen: how long result is
4572 * @secid: outgoing integer
4574 * Exists for audit and networking code.
4576 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4578 struct smack_known
*skp
= smk_find_entry(secdata
);
4581 *secid
= skp
->smk_secid
;
4588 * There used to be a smack_release_secctx hook
4589 * that did nothing back when hooks were in a vector.
4590 * Now that there's a list such a hook adds cost.
4593 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4595 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4598 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4600 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4603 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4606 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4614 static struct security_hook_list smack_hooks
[] = {
4615 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4616 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4617 LSM_HOOK_INIT(syslog
, smack_syslog
),
4619 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4620 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4621 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4622 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4623 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4624 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4625 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4627 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4628 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4629 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4631 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4632 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4633 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4634 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4635 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4636 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4637 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4638 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4639 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4640 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4641 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4642 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4643 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4644 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4645 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4646 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4647 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4648 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4650 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4651 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4652 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4653 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4654 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4655 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4656 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4657 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4658 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4659 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4661 LSM_HOOK_INIT(file_open
, smack_file_open
),
4663 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4664 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4665 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4666 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4667 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4668 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4669 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4670 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4671 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4672 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4673 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4674 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4675 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4676 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4677 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4678 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4679 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4680 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4681 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4683 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4684 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4686 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4687 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4689 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4690 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4691 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4692 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4693 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4694 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4696 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4697 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4698 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4699 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4700 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4702 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4703 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4704 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4705 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4706 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4708 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4710 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4711 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4713 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4714 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4716 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4717 #ifdef SMACK_IPV6_PORT_LABELING
4718 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4720 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4721 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4722 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4723 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4724 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4725 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4726 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4727 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4728 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4729 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4731 /* key management security hooks */
4733 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4734 LSM_HOOK_INIT(key_free
, smack_key_free
),
4735 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4736 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4737 #endif /* CONFIG_KEYS */
4741 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4742 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4743 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4744 #endif /* CONFIG_AUDIT */
4746 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4747 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4748 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4749 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4750 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4751 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4755 static __init
void init_smack_known_list(void)
4758 * Initialize rule list locks
4760 mutex_init(&smack_known_huh
.smk_rules_lock
);
4761 mutex_init(&smack_known_hat
.smk_rules_lock
);
4762 mutex_init(&smack_known_floor
.smk_rules_lock
);
4763 mutex_init(&smack_known_star
.smk_rules_lock
);
4764 mutex_init(&smack_known_web
.smk_rules_lock
);
4766 * Initialize rule lists
4768 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4769 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4770 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4771 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4772 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4774 * Create the known labels list
4776 smk_insert_entry(&smack_known_huh
);
4777 smk_insert_entry(&smack_known_hat
);
4778 smk_insert_entry(&smack_known_star
);
4779 smk_insert_entry(&smack_known_floor
);
4780 smk_insert_entry(&smack_known_web
);
4784 * smack_init - initialize the smack system
4788 static __init
int smack_init(void)
4791 struct task_smack
*tsp
;
4793 if (!security_module_enable("smack"))
4796 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4797 if (!smack_inode_cache
)
4800 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4803 kmem_cache_destroy(smack_inode_cache
);
4809 pr_info("Smack: Initializing.\n");
4810 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4811 pr_info("Smack: Netfilter enabled.\n");
4813 #ifdef SMACK_IPV6_PORT_LABELING
4814 pr_info("Smack: IPv6 port labeling enabled.\n");
4816 #ifdef SMACK_IPV6_SECMARK_LABELING
4817 pr_info("Smack: IPv6 Netfilter enabled.\n");
4821 * Set the security state for the initial task.
4823 cred
= (struct cred
*) current
->cred
;
4824 cred
->security
= tsp
;
4826 /* initialize the smack_known_list */
4827 init_smack_known_list();
4832 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4838 * Smack requires early initialization in order to label
4839 * all processes and objects when they are created.
4841 security_initcall(smack_init
);