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 static LIST_HEAD(smk_ipv6_port_list
);
57 static struct kmem_cache
*smack_inode_cache
;
60 static const match_table_t smk_mount_tokens
= {
61 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
62 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
63 {Opt_fshat
, SMK_FSHAT
"%s"},
64 {Opt_fsroot
, SMK_FSROOT
"%s"},
65 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
69 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
70 static char *smk_bu_mess
[] = {
71 "Bringup Error", /* Unused */
72 "Bringup", /* SMACK_BRINGUP_ALLOW */
73 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
74 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
77 static void smk_bu_mode(int mode
, char *s
)
87 if (mode
& MAY_APPEND
)
89 if (mode
& MAY_TRANSMUTE
)
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
100 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
101 struct smack_known
*oskp
, int mode
, int rc
)
103 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
107 if (rc
> SMACK_UNCONFINED_OBJECT
)
110 smk_bu_mode(mode
, acc
);
111 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
112 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
116 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
123 struct task_smack
*tsp
= current_security();
124 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
128 if (rc
> SMACK_UNCONFINED_OBJECT
)
131 smk_bu_mode(mode
, acc
);
132 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
133 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
134 acc
, current
->comm
, note
);
138 #define smk_bu_current(note, oskp, mode, RC) (RC)
141 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
142 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
144 struct task_smack
*tsp
= current_security();
145 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
146 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
150 if (rc
> SMACK_UNCONFINED_OBJECT
)
153 smk_bu_mode(mode
, acc
);
154 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
155 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
156 current
->comm
, otp
->comm
);
160 #define smk_bu_task(otp, mode, RC) (RC)
163 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
164 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
166 struct task_smack
*tsp
= current_security();
167 struct inode_smack
*isp
= inode
->i_security
;
168 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
170 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
171 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
172 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
176 if (rc
> SMACK_UNCONFINED_OBJECT
)
178 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
179 (mode
& (MAY_WRITE
| MAY_APPEND
)))
180 isp
->smk_flags
|= SMK_INODE_IMPURE
;
182 smk_bu_mode(mode
, acc
);
184 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
185 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
186 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
190 #define smk_bu_inode(inode, mode, RC) (RC)
193 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
194 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
196 struct task_smack
*tsp
= current_security();
197 struct smack_known
*sskp
= tsp
->smk_task
;
198 struct inode
*inode
= file_inode(file
);
199 struct inode_smack
*isp
= inode
->i_security
;
200 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
202 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
203 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
204 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
208 if (rc
> SMACK_UNCONFINED_OBJECT
)
211 smk_bu_mode(mode
, acc
);
212 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
213 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
214 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
219 #define smk_bu_file(file, mode, RC) (RC)
222 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
223 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
226 struct task_smack
*tsp
= cred
->security
;
227 struct smack_known
*sskp
= tsp
->smk_task
;
228 struct inode
*inode
= file
->f_inode
;
229 struct inode_smack
*isp
= inode
->i_security
;
230 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
232 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
233 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
234 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
238 if (rc
> SMACK_UNCONFINED_OBJECT
)
241 smk_bu_mode(mode
, acc
);
242 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
243 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
244 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
249 #define smk_bu_credfile(cred, file, mode, RC) (RC)
253 * smk_fetch - Fetch the smack label from a file.
254 * @name: type of the label (attribute)
255 * @ip: a pointer to the inode
256 * @dp: a pointer to the dentry
258 * Returns a pointer to the master list entry for the Smack label,
259 * NULL if there was no label to fetch, or an error code.
261 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
266 struct smack_known
*skp
= NULL
;
268 if (!(ip
->i_opflags
& IOP_XATTR
))
269 return ERR_PTR(-EOPNOTSUPP
);
271 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
273 return ERR_PTR(-ENOMEM
);
275 rc
= __vfs_getxattr(dp
, ip
, name
, buffer
, SMK_LONGLABEL
);
281 skp
= smk_import_entry(buffer
, rc
);
289 * new_inode_smack - allocate an inode security blob
290 * @skp: a pointer to the Smack label entry to use in the blob
292 * Returns the new blob or NULL if there's no memory available
294 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
296 struct inode_smack
*isp
;
298 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
302 isp
->smk_inode
= skp
;
304 mutex_init(&isp
->smk_lock
);
310 * new_task_smack - allocate a task security blob
311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
315 * Returns the new blob or NULL if there's no memory available
317 static struct task_smack
*new_task_smack(struct smack_known
*task
,
318 struct smack_known
*forked
, gfp_t gfp
)
320 struct task_smack
*tsp
;
322 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
326 tsp
->smk_task
= task
;
327 tsp
->smk_forked
= forked
;
328 INIT_LIST_HEAD(&tsp
->smk_rules
);
329 INIT_LIST_HEAD(&tsp
->smk_relabel
);
330 mutex_init(&tsp
->smk_rules_lock
);
336 * smk_copy_rules - copy a rule set
337 * @nhead: new rules header pointer
338 * @ohead: old rules header pointer
339 * @gfp: type of the memory for the allocation
341 * Returns 0 on success, -ENOMEM on error
343 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
346 struct smack_rule
*nrp
;
347 struct smack_rule
*orp
;
350 INIT_LIST_HEAD(nhead
);
352 list_for_each_entry_rcu(orp
, ohead
, list
) {
353 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
359 list_add_rcu(&nrp
->list
, nhead
);
365 * smk_copy_relabel - copy smk_relabel labels list
366 * @nhead: new rules header pointer
367 * @ohead: old rules header pointer
368 * @gfp: type of the memory for the allocation
370 * Returns 0 on success, -ENOMEM on error
372 static int smk_copy_relabel(struct list_head
*nhead
, struct list_head
*ohead
,
375 struct smack_known_list_elem
*nklep
;
376 struct smack_known_list_elem
*oklep
;
378 INIT_LIST_HEAD(nhead
);
380 list_for_each_entry(oklep
, ohead
, list
) {
381 nklep
= kzalloc(sizeof(struct smack_known_list_elem
), gfp
);
383 smk_destroy_label_list(nhead
);
386 nklep
->smk_label
= oklep
->smk_label
;
387 list_add(&nklep
->list
, nhead
);
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode - input mode in form of PTRACE_MODE_*
397 * Returns a converted MAY_* mode usable by smack rules
399 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
401 if (mode
& PTRACE_MODE_ATTACH
)
402 return MAY_READWRITE
;
403 if (mode
& PTRACE_MODE_READ
)
410 * smk_ptrace_rule_check - helper for ptrace access
411 * @tracer: tracer process
412 * @tracee_known: label entry of the process that's about to be traced
413 * @mode: ptrace attachment mode (PTRACE_MODE_*)
414 * @func: name of the function that called us, used for audit
416 * Returns 0 on access granted, -error on error
418 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
419 struct smack_known
*tracee_known
,
420 unsigned int mode
, const char *func
)
423 struct smk_audit_info ad
, *saip
= NULL
;
424 struct task_smack
*tsp
;
425 struct smack_known
*tracer_known
;
427 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
428 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
429 smk_ad_setfield_u_tsk(&ad
, tracer
);
434 tsp
= __task_cred(tracer
)->security
;
435 tracer_known
= smk_of_task(tsp
);
437 if ((mode
& PTRACE_MODE_ATTACH
) &&
438 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
439 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
440 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
442 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
444 else if (capable(CAP_SYS_PTRACE
))
450 smack_log(tracer_known
->smk_known
,
451 tracee_known
->smk_known
,
458 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
459 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
467 * We he, that is fun!
471 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
472 * @ctp: child task pointer
473 * @mode: ptrace attachment mode (PTRACE_MODE_*)
475 * Returns 0 if access is OK, an error code otherwise
477 * Do the capability checks.
479 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
481 struct smack_known
*skp
;
483 skp
= smk_of_task_struct(ctp
);
485 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
489 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
490 * @ptp: parent task pointer
492 * Returns 0 if access is OK, an error code otherwise
494 * Do the capability checks, and require PTRACE_MODE_ATTACH.
496 static int smack_ptrace_traceme(struct task_struct
*ptp
)
499 struct smack_known
*skp
;
501 skp
= smk_of_task(current_security());
503 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
508 * smack_syslog - Smack approval on syslog
509 * @type: message type
511 * Returns 0 on success, error code otherwise.
513 static int smack_syslog(int typefrom_file
)
516 struct smack_known
*skp
= smk_of_current();
518 if (smack_privileged(CAP_MAC_OVERRIDE
))
521 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
533 * smack_sb_alloc_security - allocate a superblock blob
534 * @sb: the superblock getting the blob
536 * Returns 0 on success or -ENOMEM on error.
538 static int smack_sb_alloc_security(struct super_block
*sb
)
540 struct superblock_smack
*sbsp
;
542 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
547 sbsp
->smk_root
= &smack_known_floor
;
548 sbsp
->smk_default
= &smack_known_floor
;
549 sbsp
->smk_floor
= &smack_known_floor
;
550 sbsp
->smk_hat
= &smack_known_hat
;
552 * SMK_SB_INITIALIZED will be zero from kzalloc.
554 sb
->s_security
= sbsp
;
560 * smack_sb_free_security - free a superblock blob
561 * @sb: the superblock getting the blob
564 static void smack_sb_free_security(struct super_block
*sb
)
566 kfree(sb
->s_security
);
567 sb
->s_security
= NULL
;
571 * smack_sb_copy_data - copy mount options data for processing
572 * @orig: where to start
573 * @smackopts: mount options string
575 * Returns 0 on success or -ENOMEM on error.
577 * Copy the Smack specific mount options out of the mount
580 static int smack_sb_copy_data(char *orig
, char *smackopts
)
582 char *cp
, *commap
, *otheropts
, *dp
;
584 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
585 if (otheropts
== NULL
)
588 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
589 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
591 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
593 else if (strstr(cp
, SMK_FSHAT
) == cp
)
595 else if (strstr(cp
, SMK_FSROOT
) == cp
)
597 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
602 commap
= strchr(cp
, ',');
611 strcpy(orig
, otheropts
);
612 free_page((unsigned long)otheropts
);
618 * smack_parse_opts_str - parse Smack specific mount options
619 * @options: mount options string
620 * @opts: where to store converted mount opts
622 * Returns 0 on success or -ENOMEM on error.
624 * converts Smack specific mount options to generic security option format
626 static int smack_parse_opts_str(char *options
,
627 struct security_mnt_opts
*opts
)
630 char *fsdefault
= NULL
;
631 char *fsfloor
= NULL
;
634 char *fstransmute
= NULL
;
636 int num_mnt_opts
= 0;
639 opts
->num_mnt_opts
= 0;
644 while ((p
= strsep(&options
, ",")) != NULL
) {
645 substring_t args
[MAX_OPT_ARGS
];
650 token
= match_token(p
, smk_mount_tokens
, args
);
656 fsdefault
= match_strdup(&args
[0]);
663 fsfloor
= match_strdup(&args
[0]);
670 fshat
= match_strdup(&args
[0]);
677 fsroot
= match_strdup(&args
[0]);
681 case Opt_fstransmute
:
684 fstransmute
= match_strdup(&args
[0]);
690 pr_warn("Smack: unknown mount option\n");
695 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_KERNEL
);
699 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
701 if (!opts
->mnt_opts_flags
) {
702 kfree(opts
->mnt_opts
);
707 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
708 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
711 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
712 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
715 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
716 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
719 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
720 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
723 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
724 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
727 opts
->num_mnt_opts
= num_mnt_opts
;
732 pr_warn("Smack: duplicate mount options\n");
744 * smack_set_mnt_opts - set Smack specific mount options
745 * @sb: the file system superblock
746 * @opts: Smack mount options
747 * @kern_flags: mount option from kernel space or user space
748 * @set_kern_flags: where to store converted mount opts
750 * Returns 0 on success, an error code on failure
752 * Allow filesystems with binary mount data to explicitly set Smack mount
755 static int smack_set_mnt_opts(struct super_block
*sb
,
756 struct security_mnt_opts
*opts
,
757 unsigned long kern_flags
,
758 unsigned long *set_kern_flags
)
760 struct dentry
*root
= sb
->s_root
;
761 struct inode
*inode
= d_backing_inode(root
);
762 struct superblock_smack
*sp
= sb
->s_security
;
763 struct inode_smack
*isp
;
764 struct smack_known
*skp
;
766 int num_opts
= opts
->num_mnt_opts
;
769 if (sp
->smk_flags
& SMK_SB_INITIALIZED
)
772 if (!smack_privileged(CAP_MAC_ADMIN
)) {
774 * Unprivileged mounts don't get to specify Smack values.
779 * Unprivileged mounts get root and default from the caller.
781 skp
= smk_of_current();
783 sp
->smk_default
= skp
;
785 * For a handful of fs types with no user-controlled
786 * backing store it's okay to trust security labels
787 * in the filesystem. The rest are untrusted.
789 if (sb
->s_user_ns
!= &init_user_ns
&&
790 sb
->s_magic
!= SYSFS_MAGIC
&& sb
->s_magic
!= TMPFS_MAGIC
&&
791 sb
->s_magic
!= RAMFS_MAGIC
) {
793 sp
->smk_flags
|= SMK_SB_UNTRUSTED
;
797 sp
->smk_flags
|= SMK_SB_INITIALIZED
;
799 for (i
= 0; i
< num_opts
; i
++) {
800 switch (opts
->mnt_opts_flags
[i
]) {
802 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
805 sp
->smk_default
= skp
;
808 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
814 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
820 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
826 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
838 * Initialize the root inode.
840 isp
= inode
->i_security
;
842 isp
= new_inode_smack(sp
->smk_root
);
845 inode
->i_security
= isp
;
847 isp
->smk_inode
= sp
->smk_root
;
850 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
856 * smack_sb_kern_mount - Smack specific mount processing
857 * @sb: the file system superblock
858 * @flags: the mount flags
859 * @data: the smack mount options
861 * Returns 0 on success, an error code on failure
863 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
866 char *options
= data
;
867 struct security_mnt_opts opts
;
869 security_init_mnt_opts(&opts
);
874 rc
= smack_parse_opts_str(options
, &opts
);
879 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
882 security_free_mnt_opts(&opts
);
887 * smack_sb_statfs - Smack check on statfs
888 * @dentry: identifies the file system in question
890 * Returns 0 if current can read the floor of the filesystem,
891 * and error code otherwise
893 static int smack_sb_statfs(struct dentry
*dentry
)
895 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
897 struct smk_audit_info ad
;
899 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
900 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
902 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
903 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
912 * smack_bprm_set_creds - set creds for exec
913 * @bprm: the exec information
915 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
917 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
919 struct inode
*inode
= file_inode(bprm
->file
);
920 struct task_smack
*bsp
= bprm
->cred
->security
;
921 struct inode_smack
*isp
;
922 struct superblock_smack
*sbsp
;
925 if (bprm
->cred_prepared
)
928 isp
= inode
->i_security
;
929 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
932 sbsp
= inode
->i_sb
->s_security
;
933 if ((sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) &&
934 isp
->smk_task
!= sbsp
->smk_root
)
937 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
938 struct task_struct
*tracer
;
942 tracer
= ptrace_parent(current
);
943 if (likely(tracer
!= NULL
))
944 rc
= smk_ptrace_rule_check(tracer
,
952 } else if (bprm
->unsafe
)
955 bsp
->smk_task
= isp
->smk_task
;
956 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
962 * smack_bprm_committing_creds - Prepare to install the new credentials
965 * @bprm: binprm for exec
967 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
969 struct task_smack
*bsp
= bprm
->cred
->security
;
971 if (bsp
->smk_task
!= bsp
->smk_forked
)
972 current
->pdeath_signal
= 0;
976 * smack_bprm_secureexec - Return the decision to use secureexec.
977 * @bprm: binprm for exec
979 * Returns 0 on success.
981 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
983 struct task_smack
*tsp
= current_security();
985 if (tsp
->smk_task
!= tsp
->smk_forked
)
996 * smack_inode_alloc_security - allocate an inode blob
997 * @inode: the inode in need of a blob
999 * Returns 0 if it gets a blob, -ENOMEM otherwise
1001 static int smack_inode_alloc_security(struct inode
*inode
)
1003 struct smack_known
*skp
= smk_of_current();
1005 inode
->i_security
= new_inode_smack(skp
);
1006 if (inode
->i_security
== NULL
)
1012 * smack_inode_free_security - free an inode blob
1013 * @inode: the inode with a blob
1015 * Clears the blob pointer in inode
1017 static void smack_inode_free_security(struct inode
*inode
)
1019 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
1020 inode
->i_security
= NULL
;
1024 * smack_inode_init_security - copy out the smack from an inode
1025 * @inode: the newly created inode
1026 * @dir: containing directory object
1028 * @name: where to put the attribute name
1029 * @value: where to put the attribute value
1030 * @len: where to put the length of the attribute
1032 * Returns 0 if it all works out, -ENOMEM if there's no memory
1034 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1035 const struct qstr
*qstr
, const char **name
,
1036 void **value
, size_t *len
)
1038 struct inode_smack
*issp
= inode
->i_security
;
1039 struct smack_known
*skp
= smk_of_current();
1040 struct smack_known
*isp
= smk_of_inode(inode
);
1041 struct smack_known
*dsp
= smk_of_inode(dir
);
1045 *name
= XATTR_SMACK_SUFFIX
;
1049 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1054 * If the access rule allows transmutation and
1055 * the directory requests transmutation then
1056 * by all means transmute.
1057 * Mark the inode as changed.
1059 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1060 smk_inode_transmutable(dir
)) {
1062 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1065 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1069 *len
= strlen(isp
->smk_known
);
1076 * smack_inode_link - Smack check on link
1077 * @old_dentry: the existing object
1079 * @new_dentry: the new object
1081 * Returns 0 if access is permitted, an error code otherwise
1083 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1084 struct dentry
*new_dentry
)
1086 struct smack_known
*isp
;
1087 struct smk_audit_info ad
;
1090 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1091 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1093 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1094 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1095 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1097 if (rc
== 0 && d_is_positive(new_dentry
)) {
1098 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1099 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1100 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1101 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1108 * smack_inode_unlink - Smack check on inode deletion
1109 * @dir: containing directory object
1110 * @dentry: file to unlink
1112 * Returns 0 if current can write the containing directory
1113 * and the object, error code otherwise
1115 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1117 struct inode
*ip
= d_backing_inode(dentry
);
1118 struct smk_audit_info ad
;
1121 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1122 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1125 * You need write access to the thing you're unlinking
1127 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1128 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1131 * You also need write access to the containing directory
1133 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1134 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1135 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1136 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1142 * smack_inode_rmdir - Smack check on directory deletion
1143 * @dir: containing directory object
1144 * @dentry: directory to unlink
1146 * Returns 0 if current can write the containing directory
1147 * and the directory, error code otherwise
1149 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1151 struct smk_audit_info ad
;
1154 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1155 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1158 * You need write access to the thing you're removing
1160 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1161 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1164 * You also need write access to the containing directory
1166 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1167 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1168 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1169 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1176 * smack_inode_rename - Smack check on rename
1177 * @old_inode: unused
1178 * @old_dentry: the old object
1179 * @new_inode: unused
1180 * @new_dentry: the new object
1182 * Read and write access is required on both the old and
1185 * Returns 0 if access is permitted, an error code otherwise
1187 static int smack_inode_rename(struct inode
*old_inode
,
1188 struct dentry
*old_dentry
,
1189 struct inode
*new_inode
,
1190 struct dentry
*new_dentry
)
1193 struct smack_known
*isp
;
1194 struct smk_audit_info ad
;
1196 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1197 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1199 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1200 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1201 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1203 if (rc
== 0 && d_is_positive(new_dentry
)) {
1204 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1205 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1206 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1207 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1213 * smack_inode_permission - Smack version of permission()
1214 * @inode: the inode in question
1215 * @mask: the access requested
1217 * This is the important Smack hook.
1219 * Returns 0 if access is permitted, -EACCES otherwise
1221 static int smack_inode_permission(struct inode
*inode
, int mask
)
1223 struct superblock_smack
*sbsp
= inode
->i_sb
->s_security
;
1224 struct smk_audit_info ad
;
1225 int no_block
= mask
& MAY_NOT_BLOCK
;
1228 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1230 * No permission to check. Existence test. Yup, it's there.
1235 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) {
1236 if (smk_of_inode(inode
) != sbsp
->smk_root
)
1240 /* May be droppable after audit */
1243 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1244 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1245 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1246 rc
= smk_bu_inode(inode
, mask
, rc
);
1251 * smack_inode_setattr - Smack check for setting attributes
1252 * @dentry: the object
1253 * @iattr: for the force flag
1255 * Returns 0 if access is permitted, an error code otherwise
1257 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1259 struct smk_audit_info ad
;
1263 * Need to allow for clearing the setuid bit.
1265 if (iattr
->ia_valid
& ATTR_FORCE
)
1267 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1268 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1270 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1271 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1276 * smack_inode_getattr - Smack check for getting attributes
1277 * @mnt: vfsmount of the object
1278 * @dentry: the object
1280 * Returns 0 if access is permitted, an error code otherwise
1282 static int smack_inode_getattr(const struct path
*path
)
1284 struct smk_audit_info ad
;
1285 struct inode
*inode
= d_backing_inode(path
->dentry
);
1288 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1289 smk_ad_setfield_u_fs_path(&ad
, *path
);
1290 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1291 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1296 * smack_inode_setxattr - Smack check for setting xattrs
1297 * @dentry: the object
1298 * @name: name of the attribute
1299 * @value: value of the attribute
1300 * @size: size of the value
1303 * This protects the Smack attribute explicitly.
1305 * Returns 0 if access is permitted, an error code otherwise
1307 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1308 const void *value
, size_t size
, int flags
)
1310 struct smk_audit_info ad
;
1311 struct smack_known
*skp
;
1313 int check_import
= 0;
1318 * Check label validity here so import won't fail in post_setxattr
1320 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1321 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1322 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1325 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1326 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1330 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1332 if (size
!= TRANS_TRUE_SIZE
||
1333 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1336 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1338 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1341 if (rc
== 0 && check_import
) {
1342 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1345 else if (skp
== NULL
|| (check_star
&&
1346 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1350 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1351 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1354 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1355 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1362 * smack_inode_post_setxattr - Apply the Smack update approved above
1364 * @name: attribute name
1365 * @value: attribute value
1366 * @size: attribute size
1369 * Set the pointer in the inode blob to the entry found
1370 * in the master label list.
1372 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1373 const void *value
, size_t size
, int flags
)
1375 struct smack_known
*skp
;
1376 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1378 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1379 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1383 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1384 skp
= smk_import_entry(value
, size
);
1386 isp
->smk_inode
= skp
;
1388 isp
->smk_inode
= &smack_known_invalid
;
1389 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1390 skp
= smk_import_entry(value
, size
);
1392 isp
->smk_task
= skp
;
1394 isp
->smk_task
= &smack_known_invalid
;
1395 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1396 skp
= smk_import_entry(value
, size
);
1398 isp
->smk_mmap
= skp
;
1400 isp
->smk_mmap
= &smack_known_invalid
;
1407 * smack_inode_getxattr - Smack check on getxattr
1408 * @dentry: the object
1411 * Returns 0 if access is permitted, an error code otherwise
1413 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1415 struct smk_audit_info ad
;
1418 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1419 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1421 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1422 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1427 * smack_inode_removexattr - Smack check on removexattr
1428 * @dentry: the object
1429 * @name: name of the attribute
1431 * Removing the Smack attribute requires CAP_MAC_ADMIN
1433 * Returns 0 if access is permitted, an error code otherwise
1435 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1437 struct inode_smack
*isp
;
1438 struct smk_audit_info ad
;
1441 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1442 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1443 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1444 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1445 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1446 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1447 if (!smack_privileged(CAP_MAC_ADMIN
))
1450 rc
= cap_inode_removexattr(dentry
, name
);
1455 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1456 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1458 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1459 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1463 isp
= d_backing_inode(dentry
)->i_security
;
1465 * Don't do anything special for these.
1466 * XATTR_NAME_SMACKIPIN
1467 * XATTR_NAME_SMACKIPOUT
1469 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1470 struct super_block
*sbp
= dentry
->d_sb
;
1471 struct superblock_smack
*sbsp
= sbp
->s_security
;
1473 isp
->smk_inode
= sbsp
->smk_default
;
1474 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0)
1475 isp
->smk_task
= NULL
;
1476 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1477 isp
->smk_mmap
= NULL
;
1478 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1479 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1485 * smack_inode_getsecurity - get smack xattrs
1486 * @inode: the object
1487 * @name: attribute name
1488 * @buffer: where to put the result
1491 * Returns the size of the attribute or an error code
1493 static int smack_inode_getsecurity(struct inode
*inode
,
1494 const char *name
, void **buffer
,
1497 struct socket_smack
*ssp
;
1498 struct socket
*sock
;
1499 struct super_block
*sbp
;
1500 struct inode
*ip
= (struct inode
*)inode
;
1501 struct smack_known
*isp
;
1505 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1506 isp
= smk_of_inode(inode
);
1507 ilen
= strlen(isp
->smk_known
);
1508 *buffer
= isp
->smk_known
;
1513 * The rest of the Smack xattrs are only on sockets.
1516 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1519 sock
= SOCKET_I(ip
);
1520 if (sock
== NULL
|| sock
->sk
== NULL
)
1523 ssp
= sock
->sk
->sk_security
;
1525 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1527 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1532 ilen
= strlen(isp
->smk_known
);
1534 *buffer
= isp
->smk_known
;
1543 * smack_inode_listsecurity - list the Smack attributes
1544 * @inode: the object
1545 * @buffer: where they go
1546 * @buffer_size: size of buffer
1548 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1551 int len
= sizeof(XATTR_NAME_SMACK
);
1553 if (buffer
!= NULL
&& len
<= buffer_size
)
1554 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1560 * smack_inode_getsecid - Extract inode's security id
1561 * @inode: inode to extract the info from
1562 * @secid: where result will be saved
1564 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1566 struct inode_smack
*isp
= inode
->i_security
;
1568 *secid
= isp
->smk_inode
->smk_secid
;
1576 * There is no smack_file_permission hook
1578 * Should access checks be done on each read or write?
1579 * UNICOS and SELinux say yes.
1580 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1582 * I'll say no for now. Smack does not do the frequent
1583 * label changing that SELinux does.
1587 * smack_file_alloc_security - assign a file security blob
1590 * The security blob for a file is a pointer to the master
1591 * label list, so no allocation is done.
1593 * f_security is the owner security information. It
1594 * isn't used on file access checks, it's for send_sigio.
1598 static int smack_file_alloc_security(struct file
*file
)
1600 struct smack_known
*skp
= smk_of_current();
1602 file
->f_security
= skp
;
1607 * smack_file_free_security - clear a file security blob
1610 * The security blob for a file is a pointer to the master
1611 * label list, so no memory is freed.
1613 static void smack_file_free_security(struct file
*file
)
1615 file
->f_security
= NULL
;
1619 * smack_file_ioctl - Smack check on ioctls
1624 * Relies heavily on the correct use of the ioctl command conventions.
1626 * Returns 0 if allowed, error code otherwise
1628 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1632 struct smk_audit_info ad
;
1633 struct inode
*inode
= file_inode(file
);
1635 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1636 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1638 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1639 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1640 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1643 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1644 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1645 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1652 * smack_file_lock - Smack check on file locking
1656 * Returns 0 if current has lock access, error code otherwise
1658 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1660 struct smk_audit_info ad
;
1662 struct inode
*inode
= file_inode(file
);
1664 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1665 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1666 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1667 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1672 * smack_file_fcntl - Smack check on fcntl
1674 * @cmd: what action to check
1677 * Generally these operations are harmless.
1678 * File locking operations present an obvious mechanism
1679 * for passing information, so they require write access.
1681 * Returns 0 if current has access, error code otherwise
1683 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1686 struct smk_audit_info ad
;
1688 struct inode
*inode
= file_inode(file
);
1695 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1696 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1697 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1698 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1702 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1703 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1704 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1705 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1716 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1717 * if mapping anonymous memory.
1718 * @file contains the file structure for file to map (may be NULL).
1719 * @reqprot contains the protection requested by the application.
1720 * @prot contains the protection that will be applied by the kernel.
1721 * @flags contains the operational flags.
1722 * Return 0 if permission is granted.
1724 static int smack_mmap_file(struct file
*file
,
1725 unsigned long reqprot
, unsigned long prot
,
1726 unsigned long flags
)
1728 struct smack_known
*skp
;
1729 struct smack_known
*mkp
;
1730 struct smack_rule
*srp
;
1731 struct task_smack
*tsp
;
1732 struct smack_known
*okp
;
1733 struct inode_smack
*isp
;
1734 struct superblock_smack
*sbsp
;
1743 isp
= file_inode(file
)->i_security
;
1744 if (isp
->smk_mmap
== NULL
)
1746 sbsp
= file_inode(file
)->i_sb
->s_security
;
1747 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
&&
1748 isp
->smk_mmap
!= sbsp
->smk_root
)
1750 mkp
= isp
->smk_mmap
;
1752 tsp
= current_security();
1753 skp
= smk_of_current();
1758 * For each Smack rule associated with the subject
1759 * label verify that the SMACK64MMAP also has access
1760 * to that rule's object label.
1762 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1763 okp
= srp
->smk_object
;
1765 * Matching labels always allows access.
1767 if (mkp
->smk_known
== okp
->smk_known
)
1770 * If there is a matching local rule take
1771 * that into account as well.
1773 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1777 may
= srp
->smk_access
;
1779 may
&= srp
->smk_access
;
1781 * If may is zero the SMACK64MMAP subject can't
1782 * possibly have less access.
1788 * Fetch the global list entry.
1789 * If there isn't one a SMACK64MMAP subject
1790 * can't have as much access as current.
1792 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1794 if (mmay
== -ENOENT
) {
1799 * If there is a local entry it modifies the
1800 * potential access, too.
1802 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1804 if (tmay
!= -ENOENT
)
1808 * If there is any access available to current that is
1809 * not available to a SMACK64MMAP subject
1812 if ((may
| mmay
) != mmay
) {
1824 * smack_file_set_fowner - set the file security blob value
1825 * @file: object in question
1828 static void smack_file_set_fowner(struct file
*file
)
1830 file
->f_security
= smk_of_current();
1834 * smack_file_send_sigiotask - Smack on sigio
1835 * @tsk: The target task
1836 * @fown: the object the signal come from
1839 * Allow a privileged task to get signals even if it shouldn't
1841 * Returns 0 if a subject with the object's smack could
1842 * write to the task, an error code otherwise.
1844 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1845 struct fown_struct
*fown
, int signum
)
1847 struct smack_known
*skp
;
1848 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1851 struct smk_audit_info ad
;
1854 * struct fown_struct is never outside the context of a struct file
1856 file
= container_of(fown
, struct file
, f_owner
);
1858 /* we don't log here as rc can be overriden */
1859 skp
= file
->f_security
;
1860 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, NULL
);
1861 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_DELIVER
, rc
);
1862 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1865 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1866 smk_ad_setfield_u_tsk(&ad
, tsk
);
1867 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_DELIVER
, rc
, &ad
);
1872 * smack_file_receive - Smack file receive check
1875 * Returns 0 if current has access, error code otherwise
1877 static int smack_file_receive(struct file
*file
)
1881 struct smk_audit_info ad
;
1882 struct inode
*inode
= file_inode(file
);
1883 struct socket
*sock
;
1884 struct task_smack
*tsp
;
1885 struct socket_smack
*ssp
;
1887 if (unlikely(IS_PRIVATE(inode
)))
1890 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1891 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1893 if (S_ISSOCK(inode
->i_mode
)) {
1894 sock
= SOCKET_I(inode
);
1895 ssp
= sock
->sk
->sk_security
;
1896 tsp
= current_security();
1898 * If the receiving process can't write to the
1899 * passed socket or if the passed socket can't
1900 * write to the receiving process don't accept
1901 * the passed socket.
1903 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1904 rc
= smk_bu_file(file
, may
, rc
);
1907 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1908 rc
= smk_bu_file(file
, may
, rc
);
1912 * This code relies on bitmasks.
1914 if (file
->f_mode
& FMODE_READ
)
1916 if (file
->f_mode
& FMODE_WRITE
)
1919 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1920 rc
= smk_bu_file(file
, may
, rc
);
1925 * smack_file_open - Smack dentry open processing
1927 * @cred: task credential
1929 * Set the security blob in the file structure.
1930 * Allow the open only if the task has read access. There are
1931 * many read operations (e.g. fstat) that you can do with an
1932 * fd even if you have the file open write-only.
1936 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1938 struct task_smack
*tsp
= cred
->security
;
1939 struct inode
*inode
= file_inode(file
);
1940 struct smk_audit_info ad
;
1943 if (smack_privileged(CAP_MAC_OVERRIDE
))
1946 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1947 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1948 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1949 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1959 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1960 * @new: the new credentials
1961 * @gfp: the atomicity of any memory allocations
1963 * Prepare a blank set of credentials for modification. This must allocate all
1964 * the memory the LSM module might require such that cred_transfer() can
1965 * complete without error.
1967 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1969 struct task_smack
*tsp
;
1971 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1975 cred
->security
= tsp
;
1982 * smack_cred_free - "free" task-level security credentials
1983 * @cred: the credentials in question
1986 static void smack_cred_free(struct cred
*cred
)
1988 struct task_smack
*tsp
= cred
->security
;
1989 struct smack_rule
*rp
;
1990 struct list_head
*l
;
1991 struct list_head
*n
;
1995 cred
->security
= NULL
;
1997 smk_destroy_label_list(&tsp
->smk_relabel
);
1999 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
2000 rp
= list_entry(l
, struct smack_rule
, list
);
2001 list_del(&rp
->list
);
2008 * smack_cred_prepare - prepare new set of credentials for modification
2009 * @new: the new credentials
2010 * @old: the original credentials
2011 * @gfp: the atomicity of any memory allocations
2013 * Prepare a new set of credentials for modification.
2015 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
2018 struct task_smack
*old_tsp
= old
->security
;
2019 struct task_smack
*new_tsp
;
2022 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
2023 if (new_tsp
== NULL
)
2026 new->security
= new_tsp
;
2028 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
2032 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
2041 * smack_cred_transfer - Transfer the old credentials to the new credentials
2042 * @new: the new credentials
2043 * @old: the original credentials
2045 * Fill in a set of blank credentials from another set of credentials.
2047 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2049 struct task_smack
*old_tsp
= old
->security
;
2050 struct task_smack
*new_tsp
= new->security
;
2052 new_tsp
->smk_task
= old_tsp
->smk_task
;
2053 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2054 mutex_init(&new_tsp
->smk_rules_lock
);
2055 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2058 /* cbs copy rule list */
2062 * smack_kernel_act_as - Set the subjective context in a set of credentials
2063 * @new: points to the set of credentials to be modified.
2064 * @secid: specifies the security ID to be set
2066 * Set the security data for a kernel service.
2068 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2070 struct task_smack
*new_tsp
= new->security
;
2071 struct smack_known
*skp
= smack_from_secid(secid
);
2076 new_tsp
->smk_task
= skp
;
2081 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2082 * @new: points to the set of credentials to be modified
2083 * @inode: points to the inode to use as a reference
2085 * Set the file creation context in a set of credentials to the same
2086 * as the objective context of the specified inode
2088 static int smack_kernel_create_files_as(struct cred
*new,
2089 struct inode
*inode
)
2091 struct inode_smack
*isp
= inode
->i_security
;
2092 struct task_smack
*tsp
= new->security
;
2094 tsp
->smk_forked
= isp
->smk_inode
;
2095 tsp
->smk_task
= tsp
->smk_forked
;
2100 * smk_curacc_on_task - helper to log task related access
2101 * @p: the task object
2102 * @access: the access requested
2103 * @caller: name of the calling function for audit
2105 * Return 0 if access is permitted
2107 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2110 struct smk_audit_info ad
;
2111 struct smack_known
*skp
= smk_of_task_struct(p
);
2114 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2115 smk_ad_setfield_u_tsk(&ad
, p
);
2116 rc
= smk_curacc(skp
, access
, &ad
);
2117 rc
= smk_bu_task(p
, access
, rc
);
2122 * smack_task_setpgid - Smack check on setting pgid
2123 * @p: the task object
2126 * Return 0 if write access is permitted
2128 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2130 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2134 * smack_task_getpgid - Smack access check for getpgid
2135 * @p: the object task
2137 * Returns 0 if current can read the object task, error code otherwise
2139 static int smack_task_getpgid(struct task_struct
*p
)
2141 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2145 * smack_task_getsid - Smack access check for getsid
2146 * @p: the object task
2148 * Returns 0 if current can read the object task, error code otherwise
2150 static int smack_task_getsid(struct task_struct
*p
)
2152 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2156 * smack_task_getsecid - get the secid of the task
2157 * @p: the object task
2158 * @secid: where to put the result
2160 * Sets the secid to contain a u32 version of the smack label.
2162 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2164 struct smack_known
*skp
= smk_of_task_struct(p
);
2166 *secid
= skp
->smk_secid
;
2170 * smack_task_setnice - Smack check on setting nice
2171 * @p: the task object
2174 * Return 0 if write access is permitted
2176 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2178 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2182 * smack_task_setioprio - Smack check on setting ioprio
2183 * @p: the task object
2186 * Return 0 if write access is permitted
2188 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2190 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2194 * smack_task_getioprio - Smack check on reading ioprio
2195 * @p: the task object
2197 * Return 0 if read access is permitted
2199 static int smack_task_getioprio(struct task_struct
*p
)
2201 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2205 * smack_task_setscheduler - Smack check on setting scheduler
2206 * @p: the task object
2210 * Return 0 if read access is permitted
2212 static int smack_task_setscheduler(struct task_struct
*p
)
2214 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2218 * smack_task_getscheduler - Smack check on reading scheduler
2219 * @p: the task object
2221 * Return 0 if read access is permitted
2223 static int smack_task_getscheduler(struct task_struct
*p
)
2225 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2229 * smack_task_movememory - Smack check on moving memory
2230 * @p: the task object
2232 * Return 0 if write access is permitted
2234 static int smack_task_movememory(struct task_struct
*p
)
2236 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2240 * smack_task_kill - Smack check on signal delivery
2241 * @p: the task object
2244 * @secid: identifies the smack to use in lieu of current's
2246 * Return 0 if write access is permitted
2248 * The secid behavior is an artifact of an SELinux hack
2249 * in the USB code. Someday it may go away.
2251 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2254 struct smk_audit_info ad
;
2255 struct smack_known
*skp
;
2256 struct smack_known
*tkp
= smk_of_task_struct(p
);
2260 return 0; /* null signal; existence test */
2262 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2263 smk_ad_setfield_u_tsk(&ad
, p
);
2265 * Sending a signal requires that the sender
2266 * can write the receiver.
2269 rc
= smk_curacc(tkp
, MAY_DELIVER
, &ad
);
2270 rc
= smk_bu_task(p
, MAY_DELIVER
, rc
);
2274 * If the secid isn't 0 we're dealing with some USB IO
2275 * specific behavior. This is not clean. For one thing
2276 * we can't take privilege into account.
2278 skp
= smack_from_secid(secid
);
2279 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, &ad
);
2280 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_DELIVER
, rc
);
2285 * smack_task_wait - Smack access check for waiting
2286 * @p: task to wait for
2290 static int smack_task_wait(struct task_struct
*p
)
2293 * Allow the operation to succeed.
2295 * In userless environments (e.g. phones) programs
2296 * get marked with SMACK64EXEC and even if the parent
2297 * and child shouldn't be talking the parent still
2298 * may expect to know when the child exits.
2304 * smack_task_to_inode - copy task smack into the inode blob
2305 * @p: task to copy from
2306 * @inode: inode to copy to
2308 * Sets the smack pointer in the inode security blob
2310 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2312 struct inode_smack
*isp
= inode
->i_security
;
2313 struct smack_known
*skp
= smk_of_task_struct(p
);
2315 isp
->smk_inode
= skp
;
2323 * smack_sk_alloc_security - Allocate a socket blob
2326 * @gfp_flags: memory allocation flags
2328 * Assign Smack pointers to current
2330 * Returns 0 on success, -ENOMEM is there's no memory
2332 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2334 struct smack_known
*skp
= smk_of_current();
2335 struct socket_smack
*ssp
;
2337 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2342 * Sockets created by kernel threads receive web label.
2344 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2345 ssp
->smk_in
= &smack_known_web
;
2346 ssp
->smk_out
= &smack_known_web
;
2351 ssp
->smk_packet
= NULL
;
2353 sk
->sk_security
= ssp
;
2359 * smack_sk_free_security - Free a socket blob
2362 * Clears the blob pointer
2364 static void smack_sk_free_security(struct sock
*sk
)
2366 kfree(sk
->sk_security
);
2370 * smack_ipv4host_label - check host based restrictions
2371 * @sip: the object end
2373 * looks for host based access restrictions
2375 * This version will only be appropriate for really small sets of single label
2376 * hosts. The caller is responsible for ensuring that the RCU read lock is
2377 * taken before calling this function.
2379 * Returns the label of the far end or NULL if it's not special.
2381 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2383 struct smk_net4addr
*snp
;
2384 struct in_addr
*siap
= &sip
->sin_addr
;
2386 if (siap
->s_addr
== 0)
2389 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2391 * we break after finding the first match because
2392 * the list is sorted from longest to shortest mask
2393 * so we have found the most specific match
2395 if (snp
->smk_host
.s_addr
==
2396 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2397 return snp
->smk_label
;
2402 #if IS_ENABLED(CONFIG_IPV6)
2404 * smk_ipv6_localhost - Check for local ipv6 host address
2407 * Returns boolean true if this is the localhost address
2409 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2411 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2412 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2414 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2415 ntohs(be16p
[7]) == 1)
2421 * smack_ipv6host_label - check host based restrictions
2422 * @sip: the object end
2424 * looks for host based access restrictions
2426 * This version will only be appropriate for really small sets of single label
2427 * hosts. The caller is responsible for ensuring that the RCU read lock is
2428 * taken before calling this function.
2430 * Returns the label of the far end or NULL if it's not special.
2432 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2434 struct smk_net6addr
*snp
;
2435 struct in6_addr
*sap
= &sip
->sin6_addr
;
2440 * It's local. Don't look for a host label.
2442 if (smk_ipv6_localhost(sip
))
2445 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2447 * If the label is NULL the entry has
2448 * been renounced. Ignore it.
2450 if (snp
->smk_label
== NULL
)
2453 * we break after finding the first match because
2454 * the list is sorted from longest to shortest mask
2455 * so we have found the most specific match
2457 for (found
= 1, i
= 0; i
< 8; i
++) {
2458 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2459 snp
->smk_host
.s6_addr16
[i
]) {
2465 return snp
->smk_label
;
2470 #endif /* CONFIG_IPV6 */
2473 * smack_netlabel - Set the secattr on a socket
2475 * @labeled: socket label scheme
2477 * Convert the outbound smack value (smk_out) to a
2478 * secattr and attach it to the socket.
2480 * Returns 0 on success or an error code
2482 static int smack_netlabel(struct sock
*sk
, int labeled
)
2484 struct smack_known
*skp
;
2485 struct socket_smack
*ssp
= sk
->sk_security
;
2489 * Usually the netlabel code will handle changing the
2490 * packet labeling based on the label.
2491 * The case of a single label host is different, because
2492 * a single label host should never get a labeled packet
2493 * even though the label is usually associated with a packet
2497 bh_lock_sock_nested(sk
);
2499 if (ssp
->smk_out
== smack_net_ambient
||
2500 labeled
== SMACK_UNLABELED_SOCKET
)
2501 netlbl_sock_delattr(sk
);
2504 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2514 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2516 * @sap: the destination address
2518 * Set the correct secattr for the given socket based on the destination
2519 * address and perform any outbound access checks needed.
2521 * Returns 0 on success or an error code.
2524 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2526 struct smack_known
*skp
;
2529 struct smack_known
*hkp
;
2530 struct socket_smack
*ssp
= sk
->sk_security
;
2531 struct smk_audit_info ad
;
2534 hkp
= smack_ipv4host_label(sap
);
2537 struct lsm_network_audit net
;
2539 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2540 ad
.a
.u
.net
->family
= sap
->sin_family
;
2541 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2542 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2544 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2546 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2547 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2549 sk_lbl
= SMACK_CIPSO_SOCKET
;
2556 return smack_netlabel(sk
, sk_lbl
);
2559 #if IS_ENABLED(CONFIG_IPV6)
2561 * smk_ipv6_check - check Smack access
2562 * @subject: subject Smack label
2563 * @object: object Smack label
2565 * @act: the action being taken
2567 * Check an IPv6 access
2569 static int smk_ipv6_check(struct smack_known
*subject
,
2570 struct smack_known
*object
,
2571 struct sockaddr_in6
*address
, int act
)
2574 struct lsm_network_audit net
;
2576 struct smk_audit_info ad
;
2580 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2581 ad
.a
.u
.net
->family
= PF_INET6
;
2582 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2583 if (act
== SMK_RECEIVING
)
2584 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2586 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2588 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2589 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2592 #endif /* CONFIG_IPV6 */
2594 #ifdef SMACK_IPV6_PORT_LABELING
2596 * smk_ipv6_port_label - Smack port access table management
2600 * Create or update the port list entry
2602 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2604 struct sock
*sk
= sock
->sk
;
2605 struct sockaddr_in6
*addr6
;
2606 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2607 struct smk_port_label
*spp
;
2608 unsigned short port
= 0;
2610 if (address
== NULL
) {
2612 * This operation is changing the Smack information
2613 * on the bound socket. Take the changes to the port
2616 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2617 if (sk
!= spp
->smk_sock
)
2619 spp
->smk_in
= ssp
->smk_in
;
2620 spp
->smk_out
= ssp
->smk_out
;
2624 * A NULL address is only used for updating existing
2625 * bound entries. If there isn't one, it's OK.
2630 addr6
= (struct sockaddr_in6
*)address
;
2631 port
= ntohs(addr6
->sin6_port
);
2633 * This is a special case that is safely ignored.
2639 * Look for an existing port list entry.
2640 * This is an indication that a port is getting reused.
2642 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2643 if (spp
->smk_port
!= port
)
2645 spp
->smk_port
= port
;
2647 spp
->smk_in
= ssp
->smk_in
;
2648 spp
->smk_out
= ssp
->smk_out
;
2653 * A new port entry is required.
2655 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2659 spp
->smk_port
= port
;
2661 spp
->smk_in
= ssp
->smk_in
;
2662 spp
->smk_out
= ssp
->smk_out
;
2664 list_add(&spp
->list
, &smk_ipv6_port_list
);
2669 * smk_ipv6_port_check - check Smack port access
2673 * Create or update the port list entry
2675 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2678 struct smk_port_label
*spp
;
2679 struct socket_smack
*ssp
= sk
->sk_security
;
2680 struct smack_known
*skp
= NULL
;
2681 unsigned short port
;
2682 struct smack_known
*object
;
2684 if (act
== SMK_RECEIVING
) {
2685 skp
= smack_ipv6host_label(address
);
2686 object
= ssp
->smk_in
;
2689 object
= smack_ipv6host_label(address
);
2693 * The other end is a single label host.
2695 if (skp
!= NULL
&& object
!= NULL
)
2696 return smk_ipv6_check(skp
, object
, address
, act
);
2698 skp
= smack_net_ambient
;
2700 object
= smack_net_ambient
;
2703 * It's remote, so port lookup does no good.
2705 if (!smk_ipv6_localhost(address
))
2706 return smk_ipv6_check(skp
, object
, address
, act
);
2709 * It's local so the send check has to have passed.
2711 if (act
== SMK_RECEIVING
)
2714 port
= ntohs(address
->sin6_port
);
2715 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2716 if (spp
->smk_port
!= port
)
2718 object
= spp
->smk_in
;
2719 if (act
== SMK_CONNECTING
)
2720 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 skp
= smack_from_secid(sap
->attr
.secid
);
3903 * This has got to be a bug because it is
3904 * impossible to specify a fallback without
3905 * specifying the label, which will ensure
3906 * it has a secid, and the only way to get a
3907 * secid is from a fallback.
3909 BUG_ON(skp
== NULL
);
3913 * Without guidance regarding the smack value
3914 * for the packet fall back on the network
3917 return smack_net_ambient
;
3920 #if IS_ENABLED(CONFIG_IPV6)
3921 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3925 int proto
= -EINVAL
;
3926 struct ipv6hdr _ipv6h
;
3927 struct ipv6hdr
*ip6
;
3929 struct tcphdr _tcph
, *th
;
3930 struct udphdr _udph
, *uh
;
3931 struct dccp_hdr _dccph
, *dh
;
3935 offset
= skb_network_offset(skb
);
3936 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3939 sip
->sin6_addr
= ip6
->saddr
;
3941 nexthdr
= ip6
->nexthdr
;
3942 offset
+= sizeof(_ipv6h
);
3943 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3950 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3952 sip
->sin6_port
= th
->source
;
3955 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3957 sip
->sin6_port
= uh
->source
;
3960 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3962 sip
->sin6_port
= dh
->dccph_sport
;
3967 #endif /* CONFIG_IPV6 */
3970 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3974 * Returns 0 if the packet should be delivered, an error code otherwise
3976 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3978 struct netlbl_lsm_secattr secattr
;
3979 struct socket_smack
*ssp
= sk
->sk_security
;
3980 struct smack_known
*skp
= NULL
;
3982 struct smk_audit_info ad
;
3984 struct lsm_network_audit net
;
3986 #if IS_ENABLED(CONFIG_IPV6)
3987 struct sockaddr_in6 sadd
;
3989 #endif /* CONFIG_IPV6 */
3991 switch (sk
->sk_family
) {
3993 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3995 * If there is a secmark use it rather than the CIPSO label.
3996 * If there is no secmark fall back to CIPSO.
3997 * The secmark is assumed to reflect policy better.
3999 if (skb
&& skb
->secmark
!= 0) {
4000 skp
= smack_from_secid(skb
->secmark
);
4003 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4005 * Translate what netlabel gave us.
4007 netlbl_secattr_init(&secattr
);
4009 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
4011 skp
= smack_from_secattr(&secattr
, ssp
);
4013 skp
= smack_net_ambient
;
4015 netlbl_secattr_destroy(&secattr
);
4017 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4021 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4022 ad
.a
.u
.net
->family
= sk
->sk_family
;
4023 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4024 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4027 * Receiving a packet requires that the other end
4028 * be able to write here. Read access is not required.
4029 * This is the simplist possible security model
4032 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4033 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
4036 netlbl_skbuff_err(skb
, sk
->sk_family
, rc
, 0);
4038 #if IS_ENABLED(CONFIG_IPV6)
4040 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
4041 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
4043 #ifdef SMACK_IPV6_SECMARK_LABELING
4044 if (skb
&& skb
->secmark
!= 0)
4045 skp
= smack_from_secid(skb
->secmark
);
4047 skp
= smack_ipv6host_label(&sadd
);
4049 skp
= smack_net_ambient
;
4051 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4052 ad
.a
.u
.net
->family
= sk
->sk_family
;
4053 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4054 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4055 #endif /* CONFIG_AUDIT */
4056 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4057 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4059 #endif /* SMACK_IPV6_SECMARK_LABELING */
4060 #ifdef SMACK_IPV6_PORT_LABELING
4061 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4062 #endif /* SMACK_IPV6_PORT_LABELING */
4064 #endif /* CONFIG_IPV6 */
4071 * smack_socket_getpeersec_stream - pull in packet label
4073 * @optval: user's destination
4074 * @optlen: size thereof
4077 * returns zero on success, an error code otherwise
4079 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4080 char __user
*optval
,
4081 int __user
*optlen
, unsigned len
)
4083 struct socket_smack
*ssp
;
4088 ssp
= sock
->sk
->sk_security
;
4089 if (ssp
->smk_packet
!= NULL
) {
4090 rcp
= ssp
->smk_packet
->smk_known
;
4091 slen
= strlen(rcp
) + 1;
4096 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4099 if (put_user(slen
, optlen
) != 0)
4107 * smack_socket_getpeersec_dgram - pull in packet label
4108 * @sock: the peer socket
4110 * @secid: pointer to where to put the secid of the packet
4112 * Sets the netlabel socket state on sk from parent
4114 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4115 struct sk_buff
*skb
, u32
*secid
)
4118 struct netlbl_lsm_secattr secattr
;
4119 struct socket_smack
*ssp
= NULL
;
4120 struct smack_known
*skp
;
4121 int family
= PF_UNSPEC
;
4122 u32 s
= 0; /* 0 is the invalid secid */
4126 if (skb
->protocol
== htons(ETH_P_IP
))
4128 #if IS_ENABLED(CONFIG_IPV6)
4129 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4131 #endif /* CONFIG_IPV6 */
4133 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4134 family
= sock
->sk
->sk_family
;
4138 ssp
= sock
->sk
->sk_security
;
4139 s
= ssp
->smk_out
->smk_secid
;
4142 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4148 * Translate what netlabel gave us.
4150 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4151 ssp
= sock
->sk
->sk_security
;
4152 netlbl_secattr_init(&secattr
);
4153 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4155 skp
= smack_from_secattr(&secattr
, ssp
);
4158 netlbl_secattr_destroy(&secattr
);
4161 #ifdef SMACK_IPV6_SECMARK_LABELING
4173 * smack_sock_graft - Initialize a newly created socket with an existing sock
4175 * @parent: parent socket
4177 * Set the smk_{in,out} state of an existing sock based on the process that
4178 * is creating the new socket.
4180 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4182 struct socket_smack
*ssp
;
4183 struct smack_known
*skp
= smk_of_current();
4186 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4189 ssp
= sk
->sk_security
;
4192 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4196 * smack_inet_conn_request - Smack access check on connect
4197 * @sk: socket involved
4201 * Returns 0 if a task with the packet label could write to
4202 * the socket, otherwise an error code
4204 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4205 struct request_sock
*req
)
4207 u16 family
= sk
->sk_family
;
4208 struct smack_known
*skp
;
4209 struct socket_smack
*ssp
= sk
->sk_security
;
4210 struct netlbl_lsm_secattr secattr
;
4211 struct sockaddr_in addr
;
4213 struct smack_known
*hskp
;
4215 struct smk_audit_info ad
;
4217 struct lsm_network_audit net
;
4220 #if IS_ENABLED(CONFIG_IPV6)
4221 if (family
== PF_INET6
) {
4223 * Handle mapped IPv4 packets arriving
4224 * via IPv6 sockets. Don't set up netlabel
4225 * processing on IPv6.
4227 if (skb
->protocol
== htons(ETH_P_IP
))
4232 #endif /* CONFIG_IPV6 */
4234 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4236 * If there is a secmark use it rather than the CIPSO label.
4237 * If there is no secmark fall back to CIPSO.
4238 * The secmark is assumed to reflect policy better.
4240 if (skb
&& skb
->secmark
!= 0) {
4241 skp
= smack_from_secid(skb
->secmark
);
4244 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4246 netlbl_secattr_init(&secattr
);
4247 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4249 skp
= smack_from_secattr(&secattr
, ssp
);
4251 skp
= &smack_known_huh
;
4252 netlbl_secattr_destroy(&secattr
);
4254 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4259 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4260 ad
.a
.u
.net
->family
= family
;
4261 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4262 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4265 * Receiving a packet requires that the other end be able to write
4266 * here. Read access is not required.
4268 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4269 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4274 * Save the peer's label in the request_sock so we can later setup
4275 * smk_packet in the child socket so that SO_PEERCRED can report it.
4277 req
->peer_secid
= skp
->smk_secid
;
4280 * We need to decide if we want to label the incoming connection here
4281 * if we do we only need to label the request_sock and the stack will
4282 * propagate the wire-label to the sock when it is created.
4285 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4287 hskp
= smack_ipv4host_label(&addr
);
4291 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4293 netlbl_req_delattr(req
);
4299 * smack_inet_csk_clone - Copy the connection information to the new socket
4300 * @sk: the new socket
4301 * @req: the connection's request_sock
4303 * Transfer the connection's peer label to the newly created socket.
4305 static void smack_inet_csk_clone(struct sock
*sk
,
4306 const struct request_sock
*req
)
4308 struct socket_smack
*ssp
= sk
->sk_security
;
4309 struct smack_known
*skp
;
4311 if (req
->peer_secid
!= 0) {
4312 skp
= smack_from_secid(req
->peer_secid
);
4313 ssp
->smk_packet
= skp
;
4315 ssp
->smk_packet
= NULL
;
4319 * Key management security hooks
4321 * Casey has not tested key support very heavily.
4322 * The permission check is most likely too restrictive.
4323 * If you care about keys please have a look.
4328 * smack_key_alloc - Set the key security blob
4330 * @cred: the credentials to use
4333 * No allocation required
4337 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4338 unsigned long flags
)
4340 struct smack_known
*skp
= smk_of_task(cred
->security
);
4342 key
->security
= skp
;
4347 * smack_key_free - Clear the key security blob
4350 * Clear the blob pointer
4352 static void smack_key_free(struct key
*key
)
4354 key
->security
= NULL
;
4358 * smack_key_permission - Smack access on a key
4359 * @key_ref: gets to the object
4360 * @cred: the credentials to use
4361 * @perm: requested key permissions
4363 * Return 0 if the task has read and write to the object,
4364 * an error code otherwise
4366 static int smack_key_permission(key_ref_t key_ref
,
4367 const struct cred
*cred
, unsigned perm
)
4370 struct smk_audit_info ad
;
4371 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4375 keyp
= key_ref_to_ptr(key_ref
);
4379 * If the key hasn't been initialized give it access so that
4382 if (keyp
->security
== NULL
)
4385 * This should not occur
4390 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4391 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4392 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4394 if (perm
& KEY_NEED_READ
)
4396 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4397 request
= MAY_WRITE
;
4398 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4399 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4404 * smack_key_getsecurity - Smack label tagging the key
4405 * @key points to the key to be queried
4406 * @_buffer points to a pointer that should be set to point to the
4407 * resulting string (if no label or an error occurs).
4408 * Return the length of the string (including terminating NUL) or -ve if
4410 * May also return 0 (and a NULL buffer pointer) if there is no label.
4412 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4414 struct smack_known
*skp
= key
->security
;
4418 if (key
->security
== NULL
) {
4423 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4426 length
= strlen(copy
) + 1;
4432 #endif /* CONFIG_KEYS */
4437 * Audit requires a unique representation of each Smack specific
4438 * rule. This unique representation is used to distinguish the
4439 * object to be audited from remaining kernel objects and also
4440 * works as a glue between the audit hooks.
4442 * Since repository entries are added but never deleted, we'll use
4443 * the smack_known label address related to the given audit rule as
4444 * the needed unique representation. This also better fits the smack
4445 * model where nearly everything is a label.
4450 * smack_audit_rule_init - Initialize a smack audit rule
4451 * @field: audit rule fields given from user-space (audit.h)
4452 * @op: required testing operator (=, !=, >, <, ...)
4453 * @rulestr: smack label to be audited
4454 * @vrule: pointer to save our own audit rule representation
4456 * Prepare to audit cases where (@field @op @rulestr) is true.
4457 * The label to be audited is created if necessay.
4459 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4461 struct smack_known
*skp
;
4462 char **rule
= (char **)vrule
;
4465 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4468 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4471 skp
= smk_import_entry(rulestr
, 0);
4473 return PTR_ERR(skp
);
4475 *rule
= skp
->smk_known
;
4481 * smack_audit_rule_known - Distinguish Smack audit rules
4482 * @krule: rule of interest, in Audit kernel representation format
4484 * This is used to filter Smack rules from remaining Audit ones.
4485 * If it's proved that this rule belongs to us, the
4486 * audit_rule_match hook will be called to do the final judgement.
4488 static int smack_audit_rule_known(struct audit_krule
*krule
)
4490 struct audit_field
*f
;
4493 for (i
= 0; i
< krule
->field_count
; i
++) {
4494 f
= &krule
->fields
[i
];
4496 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4504 * smack_audit_rule_match - Audit given object ?
4505 * @secid: security id for identifying the object to test
4506 * @field: audit rule flags given from user-space
4507 * @op: required testing operator
4508 * @vrule: smack internal rule presentation
4509 * @actx: audit context associated with the check
4511 * The core Audit hook. It's used to take the decision of
4512 * whether to audit or not to audit a given object.
4514 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4515 struct audit_context
*actx
)
4517 struct smack_known
*skp
;
4520 if (unlikely(!rule
)) {
4521 WARN_ONCE(1, "Smack: missing rule\n");
4525 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4528 skp
= smack_from_secid(secid
);
4531 * No need to do string comparisons. If a match occurs,
4532 * both pointers will point to the same smack_known
4535 if (op
== Audit_equal
)
4536 return (rule
== skp
->smk_known
);
4537 if (op
== Audit_not_equal
)
4538 return (rule
!= skp
->smk_known
);
4544 * There is no need for a smack_audit_rule_free hook.
4545 * No memory was allocated.
4548 #endif /* CONFIG_AUDIT */
4551 * smack_ismaclabel - check if xattr @name references a smack MAC label
4552 * @name: Full xattr name to check.
4554 static int smack_ismaclabel(const char *name
)
4556 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4561 * smack_secid_to_secctx - return the smack label for a secid
4562 * @secid: incoming integer
4563 * @secdata: destination
4564 * @seclen: how long it is
4566 * Exists for networking code.
4568 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4570 struct smack_known
*skp
= smack_from_secid(secid
);
4573 *secdata
= skp
->smk_known
;
4574 *seclen
= strlen(skp
->smk_known
);
4579 * smack_secctx_to_secid - return the secid for a smack label
4580 * @secdata: smack label
4581 * @seclen: how long result is
4582 * @secid: outgoing integer
4584 * Exists for audit and networking code.
4586 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4588 struct smack_known
*skp
= smk_find_entry(secdata
);
4591 *secid
= skp
->smk_secid
;
4598 * There used to be a smack_release_secctx hook
4599 * that did nothing back when hooks were in a vector.
4600 * Now that there's a list such a hook adds cost.
4603 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4605 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4608 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4610 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4613 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4616 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4624 static struct security_hook_list smack_hooks
[] = {
4625 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4626 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4627 LSM_HOOK_INIT(syslog
, smack_syslog
),
4629 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4630 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4631 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4632 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4633 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4634 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4635 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4637 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4638 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4639 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4641 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4642 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4643 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4644 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4645 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4646 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4647 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4648 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4649 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4650 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4651 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4652 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4653 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4654 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4655 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4656 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4657 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4658 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4660 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4661 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4662 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4663 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4664 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4665 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4666 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4667 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4668 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4669 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4671 LSM_HOOK_INIT(file_open
, smack_file_open
),
4673 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4674 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4675 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4676 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4677 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4678 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4679 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4680 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4681 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4682 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4683 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4684 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4685 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4686 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4687 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4688 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4689 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4690 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4691 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4693 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4694 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4696 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4697 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4699 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4700 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4701 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4702 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4703 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4704 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4706 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4707 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4708 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4709 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4710 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4712 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4713 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4714 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4715 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4716 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4718 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4720 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4721 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4723 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4724 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4726 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4727 #ifdef SMACK_IPV6_PORT_LABELING
4728 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4730 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4731 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4732 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4733 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4734 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4735 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4736 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4737 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4738 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4739 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4741 /* key management security hooks */
4743 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4744 LSM_HOOK_INIT(key_free
, smack_key_free
),
4745 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4746 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4747 #endif /* CONFIG_KEYS */
4751 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4752 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4753 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4754 #endif /* CONFIG_AUDIT */
4756 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4757 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4758 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4759 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4760 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4761 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4765 static __init
void init_smack_known_list(void)
4768 * Initialize rule list locks
4770 mutex_init(&smack_known_huh
.smk_rules_lock
);
4771 mutex_init(&smack_known_hat
.smk_rules_lock
);
4772 mutex_init(&smack_known_floor
.smk_rules_lock
);
4773 mutex_init(&smack_known_star
.smk_rules_lock
);
4774 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4775 mutex_init(&smack_known_web
.smk_rules_lock
);
4777 * Initialize rule lists
4779 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4780 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4781 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4782 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4783 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4784 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4786 * Create the known labels list
4788 smk_insert_entry(&smack_known_huh
);
4789 smk_insert_entry(&smack_known_hat
);
4790 smk_insert_entry(&smack_known_star
);
4791 smk_insert_entry(&smack_known_floor
);
4792 smk_insert_entry(&smack_known_invalid
);
4793 smk_insert_entry(&smack_known_web
);
4797 * smack_init - initialize the smack system
4801 static __init
int smack_init(void)
4804 struct task_smack
*tsp
;
4806 if (!security_module_enable("smack"))
4809 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4810 if (!smack_inode_cache
)
4813 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4816 kmem_cache_destroy(smack_inode_cache
);
4822 pr_info("Smack: Initializing.\n");
4823 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4824 pr_info("Smack: Netfilter enabled.\n");
4826 #ifdef SMACK_IPV6_PORT_LABELING
4827 pr_info("Smack: IPv6 port labeling enabled.\n");
4829 #ifdef SMACK_IPV6_SECMARK_LABELING
4830 pr_info("Smack: IPv6 Netfilter enabled.\n");
4834 * Set the security state for the initial task.
4836 cred
= (struct cred
*) current
->cred
;
4837 cred
->security
= tsp
;
4839 /* initialize the smack_known_list */
4840 init_smack_known_list();
4845 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4851 * Smack requires early initialization in order to label
4852 * all processes and objects when they are created.
4854 security_initcall(smack_init
);