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_op
->getxattr
== NULL
)
269 return ERR_PTR(-EOPNOTSUPP
);
271 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
273 return ERR_PTR(-ENOMEM
);
275 rc
= ip
->i_op
->getxattr(dp
, 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_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_ATOMIC
);
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_initialized
)
772 sp
->smk_initialized
= 1;
774 for (i
= 0; i
< num_opts
; i
++) {
775 switch (opts
->mnt_opts_flags
[i
]) {
777 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
780 sp
->smk_default
= skp
;
783 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
789 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
795 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
801 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
812 if (!smack_privileged(CAP_MAC_ADMIN
)) {
814 * Unprivileged mounts don't get to specify Smack values.
819 * Unprivileged mounts get root and default from the caller.
821 skp
= smk_of_current();
823 sp
->smk_default
= skp
;
827 * Initialize the root inode.
829 isp
= inode
->i_security
;
831 isp
= new_inode_smack(sp
->smk_root
);
834 inode
->i_security
= isp
;
836 isp
->smk_inode
= sp
->smk_root
;
839 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
845 * smack_sb_kern_mount - Smack specific mount processing
846 * @sb: the file system superblock
847 * @flags: the mount flags
848 * @data: the smack mount options
850 * Returns 0 on success, an error code on failure
852 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
855 char *options
= data
;
856 struct security_mnt_opts opts
;
858 security_init_mnt_opts(&opts
);
863 rc
= smack_parse_opts_str(options
, &opts
);
868 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
871 security_free_mnt_opts(&opts
);
876 * smack_sb_statfs - Smack check on statfs
877 * @dentry: identifies the file system in question
879 * Returns 0 if current can read the floor of the filesystem,
880 * and error code otherwise
882 static int smack_sb_statfs(struct dentry
*dentry
)
884 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
886 struct smk_audit_info ad
;
888 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
889 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
891 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
892 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
901 * smack_bprm_set_creds - set creds for exec
902 * @bprm: the exec information
904 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
906 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
908 struct inode
*inode
= file_inode(bprm
->file
);
909 struct task_smack
*bsp
= bprm
->cred
->security
;
910 struct inode_smack
*isp
;
913 if (bprm
->cred_prepared
)
916 isp
= inode
->i_security
;
917 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
920 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
921 struct task_struct
*tracer
;
925 tracer
= ptrace_parent(current
);
926 if (likely(tracer
!= NULL
))
927 rc
= smk_ptrace_rule_check(tracer
,
935 } else if (bprm
->unsafe
)
938 bsp
->smk_task
= isp
->smk_task
;
939 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
945 * smack_bprm_committing_creds - Prepare to install the new credentials
948 * @bprm: binprm for exec
950 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
952 struct task_smack
*bsp
= bprm
->cred
->security
;
954 if (bsp
->smk_task
!= bsp
->smk_forked
)
955 current
->pdeath_signal
= 0;
959 * smack_bprm_secureexec - Return the decision to use secureexec.
960 * @bprm: binprm for exec
962 * Returns 0 on success.
964 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
966 struct task_smack
*tsp
= current_security();
968 if (tsp
->smk_task
!= tsp
->smk_forked
)
979 * smack_inode_alloc_security - allocate an inode blob
980 * @inode: the inode in need of a blob
982 * Returns 0 if it gets a blob, -ENOMEM otherwise
984 static int smack_inode_alloc_security(struct inode
*inode
)
986 struct smack_known
*skp
= smk_of_current();
988 inode
->i_security
= new_inode_smack(skp
);
989 if (inode
->i_security
== NULL
)
995 * smack_inode_free_security - free an inode blob
996 * @inode: the inode with a blob
998 * Clears the blob pointer in inode
1000 static void smack_inode_free_security(struct inode
*inode
)
1002 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
1003 inode
->i_security
= NULL
;
1007 * smack_inode_init_security - copy out the smack from an inode
1008 * @inode: the newly created inode
1009 * @dir: containing directory object
1011 * @name: where to put the attribute name
1012 * @value: where to put the attribute value
1013 * @len: where to put the length of the attribute
1015 * Returns 0 if it all works out, -ENOMEM if there's no memory
1017 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1018 const struct qstr
*qstr
, const char **name
,
1019 void **value
, size_t *len
)
1021 struct inode_smack
*issp
= inode
->i_security
;
1022 struct smack_known
*skp
= smk_of_current();
1023 struct smack_known
*isp
= smk_of_inode(inode
);
1024 struct smack_known
*dsp
= smk_of_inode(dir
);
1028 *name
= XATTR_SMACK_SUFFIX
;
1032 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1037 * If the access rule allows transmutation and
1038 * the directory requests transmutation then
1039 * by all means transmute.
1040 * Mark the inode as changed.
1042 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1043 smk_inode_transmutable(dir
)) {
1045 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1048 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1052 *len
= strlen(isp
->smk_known
);
1059 * smack_inode_link - Smack check on link
1060 * @old_dentry: the existing object
1062 * @new_dentry: the new object
1064 * Returns 0 if access is permitted, an error code otherwise
1066 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1067 struct dentry
*new_dentry
)
1069 struct smack_known
*isp
;
1070 struct smk_audit_info ad
;
1073 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1074 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1076 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1077 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1078 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1080 if (rc
== 0 && d_is_positive(new_dentry
)) {
1081 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1082 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1083 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1084 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1091 * smack_inode_unlink - Smack check on inode deletion
1092 * @dir: containing directory object
1093 * @dentry: file to unlink
1095 * Returns 0 if current can write the containing directory
1096 * and the object, error code otherwise
1098 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1100 struct inode
*ip
= d_backing_inode(dentry
);
1101 struct smk_audit_info ad
;
1104 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1105 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1108 * You need write access to the thing you're unlinking
1110 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1111 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1114 * You also need write access to the containing directory
1116 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1117 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1118 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1119 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1125 * smack_inode_rmdir - Smack check on directory deletion
1126 * @dir: containing directory object
1127 * @dentry: directory to unlink
1129 * Returns 0 if current can write the containing directory
1130 * and the directory, error code otherwise
1132 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1134 struct smk_audit_info ad
;
1137 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1138 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1141 * You need write access to the thing you're removing
1143 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1144 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1147 * You also need write access to the containing directory
1149 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1150 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1151 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1152 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1159 * smack_inode_rename - Smack check on rename
1160 * @old_inode: unused
1161 * @old_dentry: the old object
1162 * @new_inode: unused
1163 * @new_dentry: the new object
1165 * Read and write access is required on both the old and
1168 * Returns 0 if access is permitted, an error code otherwise
1170 static int smack_inode_rename(struct inode
*old_inode
,
1171 struct dentry
*old_dentry
,
1172 struct inode
*new_inode
,
1173 struct dentry
*new_dentry
)
1176 struct smack_known
*isp
;
1177 struct smk_audit_info ad
;
1179 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1180 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1182 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1183 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1184 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1186 if (rc
== 0 && d_is_positive(new_dentry
)) {
1187 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1188 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1189 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1190 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1196 * smack_inode_permission - Smack version of permission()
1197 * @inode: the inode in question
1198 * @mask: the access requested
1200 * This is the important Smack hook.
1202 * Returns 0 if access is permitted, -EACCES otherwise
1204 static int smack_inode_permission(struct inode
*inode
, int mask
)
1206 struct smk_audit_info ad
;
1207 int no_block
= mask
& MAY_NOT_BLOCK
;
1210 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1212 * No permission to check. Existence test. Yup, it's there.
1217 /* May be droppable after audit */
1220 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1221 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1222 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1223 rc
= smk_bu_inode(inode
, mask
, rc
);
1228 * smack_inode_setattr - Smack check for setting attributes
1229 * @dentry: the object
1230 * @iattr: for the force flag
1232 * Returns 0 if access is permitted, an error code otherwise
1234 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1236 struct smk_audit_info ad
;
1240 * Need to allow for clearing the setuid bit.
1242 if (iattr
->ia_valid
& ATTR_FORCE
)
1244 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1245 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1247 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1248 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1253 * smack_inode_getattr - Smack check for getting attributes
1254 * @mnt: vfsmount of the object
1255 * @dentry: the object
1257 * Returns 0 if access is permitted, an error code otherwise
1259 static int smack_inode_getattr(const struct path
*path
)
1261 struct smk_audit_info ad
;
1262 struct inode
*inode
= d_backing_inode(path
->dentry
);
1265 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1266 smk_ad_setfield_u_fs_path(&ad
, *path
);
1267 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1268 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1273 * smack_inode_setxattr - Smack check for setting xattrs
1274 * @dentry: the object
1275 * @name: name of the attribute
1276 * @value: value of the attribute
1277 * @size: size of the value
1280 * This protects the Smack attribute explicitly.
1282 * Returns 0 if access is permitted, an error code otherwise
1284 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1285 const void *value
, size_t size
, int flags
)
1287 struct smk_audit_info ad
;
1288 struct smack_known
*skp
;
1290 int check_import
= 0;
1295 * Check label validity here so import won't fail in post_setxattr
1297 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1298 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1299 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1302 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1303 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1307 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1309 if (size
!= TRANS_TRUE_SIZE
||
1310 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1313 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1315 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1318 if (rc
== 0 && check_import
) {
1319 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1322 else if (skp
== NULL
|| (check_star
&&
1323 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1327 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1328 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1331 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1332 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1339 * smack_inode_post_setxattr - Apply the Smack update approved above
1341 * @name: attribute name
1342 * @value: attribute value
1343 * @size: attribute size
1346 * Set the pointer in the inode blob to the entry found
1347 * in the master label list.
1349 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1350 const void *value
, size_t size
, int flags
)
1352 struct smack_known
*skp
;
1353 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1355 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1356 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1360 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1361 skp
= smk_import_entry(value
, size
);
1363 isp
->smk_inode
= skp
;
1365 isp
->smk_inode
= &smack_known_invalid
;
1366 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1367 skp
= smk_import_entry(value
, size
);
1369 isp
->smk_task
= skp
;
1371 isp
->smk_task
= &smack_known_invalid
;
1372 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1373 skp
= smk_import_entry(value
, size
);
1375 isp
->smk_mmap
= skp
;
1377 isp
->smk_mmap
= &smack_known_invalid
;
1384 * smack_inode_getxattr - Smack check on getxattr
1385 * @dentry: the object
1388 * Returns 0 if access is permitted, an error code otherwise
1390 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1392 struct smk_audit_info ad
;
1395 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1396 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1398 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1399 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1404 * smack_inode_removexattr - Smack check on removexattr
1405 * @dentry: the object
1406 * @name: name of the attribute
1408 * Removing the Smack attribute requires CAP_MAC_ADMIN
1410 * Returns 0 if access is permitted, an error code otherwise
1412 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1414 struct inode_smack
*isp
;
1415 struct smk_audit_info ad
;
1418 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1419 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1420 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1421 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1422 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1423 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1424 if (!smack_privileged(CAP_MAC_ADMIN
))
1427 rc
= cap_inode_removexattr(dentry
, name
);
1432 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1433 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1435 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1436 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1440 isp
= d_backing_inode(dentry
)->i_security
;
1442 * Don't do anything special for these.
1443 * XATTR_NAME_SMACKIPIN
1444 * XATTR_NAME_SMACKIPOUT
1445 * XATTR_NAME_SMACKEXEC
1447 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1448 isp
->smk_task
= NULL
;
1449 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1450 isp
->smk_mmap
= NULL
;
1451 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1452 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1458 * smack_inode_getsecurity - get smack xattrs
1459 * @inode: the object
1460 * @name: attribute name
1461 * @buffer: where to put the result
1464 * Returns the size of the attribute or an error code
1466 static int smack_inode_getsecurity(struct inode
*inode
,
1467 const char *name
, void **buffer
,
1470 struct socket_smack
*ssp
;
1471 struct socket
*sock
;
1472 struct super_block
*sbp
;
1473 struct inode
*ip
= (struct inode
*)inode
;
1474 struct smack_known
*isp
;
1478 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1479 isp
= smk_of_inode(inode
);
1480 ilen
= strlen(isp
->smk_known
);
1481 *buffer
= isp
->smk_known
;
1486 * The rest of the Smack xattrs are only on sockets.
1489 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1492 sock
= SOCKET_I(ip
);
1493 if (sock
== NULL
|| sock
->sk
== NULL
)
1496 ssp
= sock
->sk
->sk_security
;
1498 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1500 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1505 ilen
= strlen(isp
->smk_known
);
1507 *buffer
= isp
->smk_known
;
1516 * smack_inode_listsecurity - list the Smack attributes
1517 * @inode: the object
1518 * @buffer: where they go
1519 * @buffer_size: size of buffer
1521 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1524 int len
= sizeof(XATTR_NAME_SMACK
);
1526 if (buffer
!= NULL
&& len
<= buffer_size
)
1527 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1533 * smack_inode_getsecid - Extract inode's security id
1534 * @inode: inode to extract the info from
1535 * @secid: where result will be saved
1537 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1539 struct inode_smack
*isp
= inode
->i_security
;
1541 *secid
= isp
->smk_inode
->smk_secid
;
1549 * smack_file_permission - Smack check on file operations
1555 * Should access checks be done on each read or write?
1556 * UNICOS and SELinux say yes.
1557 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1559 * I'll say no for now. Smack does not do the frequent
1560 * label changing that SELinux does.
1562 static int smack_file_permission(struct file
*file
, int mask
)
1568 * smack_file_alloc_security - assign a file security blob
1571 * The security blob for a file is a pointer to the master
1572 * label list, so no allocation is done.
1574 * f_security is the owner security information. It
1575 * isn't used on file access checks, it's for send_sigio.
1579 static int smack_file_alloc_security(struct file
*file
)
1581 struct smack_known
*skp
= smk_of_current();
1583 file
->f_security
= skp
;
1588 * smack_file_free_security - clear a file security blob
1591 * The security blob for a file is a pointer to the master
1592 * label list, so no memory is freed.
1594 static void smack_file_free_security(struct file
*file
)
1596 file
->f_security
= NULL
;
1600 * smack_file_ioctl - Smack check on ioctls
1605 * Relies heavily on the correct use of the ioctl command conventions.
1607 * Returns 0 if allowed, error code otherwise
1609 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1613 struct smk_audit_info ad
;
1614 struct inode
*inode
= file_inode(file
);
1616 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1617 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1619 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1620 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1621 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1624 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1625 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1626 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1633 * smack_file_lock - Smack check on file locking
1637 * Returns 0 if current has lock access, error code otherwise
1639 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1641 struct smk_audit_info ad
;
1643 struct inode
*inode
= file_inode(file
);
1645 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1646 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1647 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1648 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1653 * smack_file_fcntl - Smack check on fcntl
1655 * @cmd: what action to check
1658 * Generally these operations are harmless.
1659 * File locking operations present an obvious mechanism
1660 * for passing information, so they require write access.
1662 * Returns 0 if current has access, error code otherwise
1664 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1667 struct smk_audit_info ad
;
1669 struct inode
*inode
= file_inode(file
);
1676 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1677 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1678 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1679 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1683 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1684 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1685 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1686 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1697 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1698 * if mapping anonymous memory.
1699 * @file contains the file structure for file to map (may be NULL).
1700 * @reqprot contains the protection requested by the application.
1701 * @prot contains the protection that will be applied by the kernel.
1702 * @flags contains the operational flags.
1703 * Return 0 if permission is granted.
1705 static int smack_mmap_file(struct file
*file
,
1706 unsigned long reqprot
, unsigned long prot
,
1707 unsigned long flags
)
1709 struct smack_known
*skp
;
1710 struct smack_known
*mkp
;
1711 struct smack_rule
*srp
;
1712 struct task_smack
*tsp
;
1713 struct smack_known
*okp
;
1714 struct inode_smack
*isp
;
1723 isp
= file_inode(file
)->i_security
;
1724 if (isp
->smk_mmap
== NULL
)
1726 mkp
= isp
->smk_mmap
;
1728 tsp
= current_security();
1729 skp
= smk_of_current();
1734 * For each Smack rule associated with the subject
1735 * label verify that the SMACK64MMAP also has access
1736 * to that rule's object label.
1738 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1739 okp
= srp
->smk_object
;
1741 * Matching labels always allows access.
1743 if (mkp
->smk_known
== okp
->smk_known
)
1746 * If there is a matching local rule take
1747 * that into account as well.
1749 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1753 may
= srp
->smk_access
;
1755 may
&= srp
->smk_access
;
1757 * If may is zero the SMACK64MMAP subject can't
1758 * possibly have less access.
1764 * Fetch the global list entry.
1765 * If there isn't one a SMACK64MMAP subject
1766 * can't have as much access as current.
1768 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1770 if (mmay
== -ENOENT
) {
1775 * If there is a local entry it modifies the
1776 * potential access, too.
1778 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1780 if (tmay
!= -ENOENT
)
1784 * If there is any access available to current that is
1785 * not available to a SMACK64MMAP subject
1788 if ((may
| mmay
) != mmay
) {
1800 * smack_file_set_fowner - set the file security blob value
1801 * @file: object in question
1804 static void smack_file_set_fowner(struct file
*file
)
1806 file
->f_security
= smk_of_current();
1810 * smack_file_send_sigiotask - Smack on sigio
1811 * @tsk: The target task
1812 * @fown: the object the signal come from
1815 * Allow a privileged task to get signals even if it shouldn't
1817 * Returns 0 if a subject with the object's smack could
1818 * write to the task, an error code otherwise.
1820 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1821 struct fown_struct
*fown
, int signum
)
1823 struct smack_known
*skp
;
1824 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1827 struct smk_audit_info ad
;
1830 * struct fown_struct is never outside the context of a struct file
1832 file
= container_of(fown
, struct file
, f_owner
);
1834 /* we don't log here as rc can be overriden */
1835 skp
= file
->f_security
;
1836 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1837 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1838 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1841 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1842 smk_ad_setfield_u_tsk(&ad
, tsk
);
1843 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1848 * smack_file_receive - Smack file receive check
1851 * Returns 0 if current has access, error code otherwise
1853 static int smack_file_receive(struct file
*file
)
1857 struct smk_audit_info ad
;
1858 struct inode
*inode
= file_inode(file
);
1859 struct socket
*sock
;
1860 struct task_smack
*tsp
;
1861 struct socket_smack
*ssp
;
1863 if (unlikely(IS_PRIVATE(inode
)))
1866 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1867 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1869 if (S_ISSOCK(inode
->i_mode
)) {
1870 sock
= SOCKET_I(inode
);
1871 ssp
= sock
->sk
->sk_security
;
1872 tsp
= current_security();
1874 * If the receiving process can't write to the
1875 * passed socket or if the passed socket can't
1876 * write to the receiving process don't accept
1877 * the passed socket.
1879 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1880 rc
= smk_bu_file(file
, may
, rc
);
1883 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1884 rc
= smk_bu_file(file
, may
, rc
);
1888 * This code relies on bitmasks.
1890 if (file
->f_mode
& FMODE_READ
)
1892 if (file
->f_mode
& FMODE_WRITE
)
1895 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1896 rc
= smk_bu_file(file
, may
, rc
);
1901 * smack_file_open - Smack dentry open processing
1903 * @cred: task credential
1905 * Set the security blob in the file structure.
1906 * Allow the open only if the task has read access. There are
1907 * many read operations (e.g. fstat) that you can do with an
1908 * fd even if you have the file open write-only.
1912 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1914 struct task_smack
*tsp
= cred
->security
;
1915 struct inode
*inode
= file_inode(file
);
1916 struct smk_audit_info ad
;
1919 if (smack_privileged(CAP_MAC_OVERRIDE
))
1922 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1923 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1924 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1925 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1935 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1936 * @new: the new credentials
1937 * @gfp: the atomicity of any memory allocations
1939 * Prepare a blank set of credentials for modification. This must allocate all
1940 * the memory the LSM module might require such that cred_transfer() can
1941 * complete without error.
1943 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1945 struct task_smack
*tsp
;
1947 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1951 cred
->security
= tsp
;
1958 * smack_cred_free - "free" task-level security credentials
1959 * @cred: the credentials in question
1962 static void smack_cred_free(struct cred
*cred
)
1964 struct task_smack
*tsp
= cred
->security
;
1965 struct smack_rule
*rp
;
1966 struct list_head
*l
;
1967 struct list_head
*n
;
1971 cred
->security
= NULL
;
1973 smk_destroy_label_list(&tsp
->smk_relabel
);
1975 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1976 rp
= list_entry(l
, struct smack_rule
, list
);
1977 list_del(&rp
->list
);
1984 * smack_cred_prepare - prepare new set of credentials for modification
1985 * @new: the new credentials
1986 * @old: the original credentials
1987 * @gfp: the atomicity of any memory allocations
1989 * Prepare a new set of credentials for modification.
1991 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1994 struct task_smack
*old_tsp
= old
->security
;
1995 struct task_smack
*new_tsp
;
1998 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1999 if (new_tsp
== NULL
)
2002 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
2006 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
2011 new->security
= new_tsp
;
2016 * smack_cred_transfer - Transfer the old credentials to the new credentials
2017 * @new: the new credentials
2018 * @old: the original credentials
2020 * Fill in a set of blank credentials from another set of credentials.
2022 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2024 struct task_smack
*old_tsp
= old
->security
;
2025 struct task_smack
*new_tsp
= new->security
;
2027 new_tsp
->smk_task
= old_tsp
->smk_task
;
2028 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2029 mutex_init(&new_tsp
->smk_rules_lock
);
2030 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2033 /* cbs copy rule list */
2037 * smack_kernel_act_as - Set the subjective context in a set of credentials
2038 * @new: points to the set of credentials to be modified.
2039 * @secid: specifies the security ID to be set
2041 * Set the security data for a kernel service.
2043 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2045 struct task_smack
*new_tsp
= new->security
;
2046 struct smack_known
*skp
= smack_from_secid(secid
);
2051 new_tsp
->smk_task
= skp
;
2056 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2057 * @new: points to the set of credentials to be modified
2058 * @inode: points to the inode to use as a reference
2060 * Set the file creation context in a set of credentials to the same
2061 * as the objective context of the specified inode
2063 static int smack_kernel_create_files_as(struct cred
*new,
2064 struct inode
*inode
)
2066 struct inode_smack
*isp
= inode
->i_security
;
2067 struct task_smack
*tsp
= new->security
;
2069 tsp
->smk_forked
= isp
->smk_inode
;
2070 tsp
->smk_task
= tsp
->smk_forked
;
2075 * smk_curacc_on_task - helper to log task related access
2076 * @p: the task object
2077 * @access: the access requested
2078 * @caller: name of the calling function for audit
2080 * Return 0 if access is permitted
2082 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2085 struct smk_audit_info ad
;
2086 struct smack_known
*skp
= smk_of_task_struct(p
);
2089 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2090 smk_ad_setfield_u_tsk(&ad
, p
);
2091 rc
= smk_curacc(skp
, access
, &ad
);
2092 rc
= smk_bu_task(p
, access
, rc
);
2097 * smack_task_setpgid - Smack check on setting pgid
2098 * @p: the task object
2101 * Return 0 if write access is permitted
2103 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2105 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2109 * smack_task_getpgid - Smack access check for getpgid
2110 * @p: the object task
2112 * Returns 0 if current can read the object task, error code otherwise
2114 static int smack_task_getpgid(struct task_struct
*p
)
2116 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2120 * smack_task_getsid - Smack access check for getsid
2121 * @p: the object task
2123 * Returns 0 if current can read the object task, error code otherwise
2125 static int smack_task_getsid(struct task_struct
*p
)
2127 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2131 * smack_task_getsecid - get the secid of the task
2132 * @p: the object task
2133 * @secid: where to put the result
2135 * Sets the secid to contain a u32 version of the smack label.
2137 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2139 struct smack_known
*skp
= smk_of_task_struct(p
);
2141 *secid
= skp
->smk_secid
;
2145 * smack_task_setnice - Smack check on setting nice
2146 * @p: the task object
2149 * Return 0 if write access is permitted
2151 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2153 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2157 * smack_task_setioprio - Smack check on setting ioprio
2158 * @p: the task object
2161 * Return 0 if write access is permitted
2163 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2165 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2169 * smack_task_getioprio - Smack check on reading ioprio
2170 * @p: the task object
2172 * Return 0 if read access is permitted
2174 static int smack_task_getioprio(struct task_struct
*p
)
2176 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2180 * smack_task_setscheduler - Smack check on setting scheduler
2181 * @p: the task object
2185 * Return 0 if read access is permitted
2187 static int smack_task_setscheduler(struct task_struct
*p
)
2189 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2193 * smack_task_getscheduler - Smack check on reading scheduler
2194 * @p: the task object
2196 * Return 0 if read access is permitted
2198 static int smack_task_getscheduler(struct task_struct
*p
)
2200 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2204 * smack_task_movememory - Smack check on moving memory
2205 * @p: the task object
2207 * Return 0 if write access is permitted
2209 static int smack_task_movememory(struct task_struct
*p
)
2211 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2215 * smack_task_kill - Smack check on signal delivery
2216 * @p: the task object
2219 * @secid: identifies the smack to use in lieu of current's
2221 * Return 0 if write access is permitted
2223 * The secid behavior is an artifact of an SELinux hack
2224 * in the USB code. Someday it may go away.
2226 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2229 struct smk_audit_info ad
;
2230 struct smack_known
*skp
;
2231 struct smack_known
*tkp
= smk_of_task_struct(p
);
2234 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2235 smk_ad_setfield_u_tsk(&ad
, p
);
2237 * Sending a signal requires that the sender
2238 * can write the receiver.
2241 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
2242 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2246 * If the secid isn't 0 we're dealing with some USB IO
2247 * specific behavior. This is not clean. For one thing
2248 * we can't take privilege into account.
2250 skp
= smack_from_secid(secid
);
2251 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2252 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2257 * smack_task_wait - Smack access check for waiting
2258 * @p: task to wait for
2262 static int smack_task_wait(struct task_struct
*p
)
2265 * Allow the operation to succeed.
2267 * In userless environments (e.g. phones) programs
2268 * get marked with SMACK64EXEC and even if the parent
2269 * and child shouldn't be talking the parent still
2270 * may expect to know when the child exits.
2276 * smack_task_to_inode - copy task smack into the inode blob
2277 * @p: task to copy from
2278 * @inode: inode to copy to
2280 * Sets the smack pointer in the inode security blob
2282 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2284 struct inode_smack
*isp
= inode
->i_security
;
2285 struct smack_known
*skp
= smk_of_task_struct(p
);
2287 isp
->smk_inode
= skp
;
2295 * smack_sk_alloc_security - Allocate a socket blob
2298 * @gfp_flags: memory allocation flags
2300 * Assign Smack pointers to current
2302 * Returns 0 on success, -ENOMEM is there's no memory
2304 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2306 struct smack_known
*skp
= smk_of_current();
2307 struct socket_smack
*ssp
;
2309 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2315 ssp
->smk_packet
= NULL
;
2317 sk
->sk_security
= ssp
;
2323 * smack_sk_free_security - Free a socket blob
2326 * Clears the blob pointer
2328 static void smack_sk_free_security(struct sock
*sk
)
2330 kfree(sk
->sk_security
);
2334 * smack_ipv4host_label - check host based restrictions
2335 * @sip: the object end
2337 * looks for host based access restrictions
2339 * This version will only be appropriate for really small sets of single label
2340 * hosts. The caller is responsible for ensuring that the RCU read lock is
2341 * taken before calling this function.
2343 * Returns the label of the far end or NULL if it's not special.
2345 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2347 struct smk_net4addr
*snp
;
2348 struct in_addr
*siap
= &sip
->sin_addr
;
2350 if (siap
->s_addr
== 0)
2353 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2355 * we break after finding the first match because
2356 * the list is sorted from longest to shortest mask
2357 * so we have found the most specific match
2359 if (snp
->smk_host
.s_addr
==
2360 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2361 return snp
->smk_label
;
2366 #if IS_ENABLED(CONFIG_IPV6)
2368 * smk_ipv6_localhost - Check for local ipv6 host address
2371 * Returns boolean true if this is the localhost address
2373 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2375 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2376 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2378 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2379 ntohs(be16p
[7]) == 1)
2385 * smack_ipv6host_label - check host based restrictions
2386 * @sip: the object end
2388 * looks for host based access restrictions
2390 * This version will only be appropriate for really small sets of single label
2391 * hosts. The caller is responsible for ensuring that the RCU read lock is
2392 * taken before calling this function.
2394 * Returns the label of the far end or NULL if it's not special.
2396 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2398 struct smk_net6addr
*snp
;
2399 struct in6_addr
*sap
= &sip
->sin6_addr
;
2404 * It's local. Don't look for a host label.
2406 if (smk_ipv6_localhost(sip
))
2409 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2411 * we break after finding the first match because
2412 * the list is sorted from longest to shortest mask
2413 * so we have found the most specific match
2415 for (found
= 1, i
= 0; i
< 8; i
++) {
2417 * If the label is NULL the entry has
2418 * been renounced. Ignore it.
2420 if (snp
->smk_label
== NULL
)
2422 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2423 snp
->smk_host
.s6_addr16
[i
]) {
2429 return snp
->smk_label
;
2434 #endif /* CONFIG_IPV6 */
2437 * smack_netlabel - Set the secattr on a socket
2439 * @labeled: socket label scheme
2441 * Convert the outbound smack value (smk_out) to a
2442 * secattr and attach it to the socket.
2444 * Returns 0 on success or an error code
2446 static int smack_netlabel(struct sock
*sk
, int labeled
)
2448 struct smack_known
*skp
;
2449 struct socket_smack
*ssp
= sk
->sk_security
;
2453 * Usually the netlabel code will handle changing the
2454 * packet labeling based on the label.
2455 * The case of a single label host is different, because
2456 * a single label host should never get a labeled packet
2457 * even though the label is usually associated with a packet
2461 bh_lock_sock_nested(sk
);
2463 if (ssp
->smk_out
== smack_net_ambient
||
2464 labeled
== SMACK_UNLABELED_SOCKET
)
2465 netlbl_sock_delattr(sk
);
2468 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2478 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2480 * @sap: the destination address
2482 * Set the correct secattr for the given socket based on the destination
2483 * address and perform any outbound access checks needed.
2485 * Returns 0 on success or an error code.
2488 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2490 struct smack_known
*skp
;
2493 struct smack_known
*hkp
;
2494 struct socket_smack
*ssp
= sk
->sk_security
;
2495 struct smk_audit_info ad
;
2498 hkp
= smack_ipv4host_label(sap
);
2501 struct lsm_network_audit net
;
2503 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2504 ad
.a
.u
.net
->family
= sap
->sin_family
;
2505 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2506 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2508 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2510 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2511 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2513 sk_lbl
= SMACK_CIPSO_SOCKET
;
2520 return smack_netlabel(sk
, sk_lbl
);
2523 #if IS_ENABLED(CONFIG_IPV6)
2525 * smk_ipv6_check - check Smack access
2526 * @subject: subject Smack label
2527 * @object: object Smack label
2529 * @act: the action being taken
2531 * Check an IPv6 access
2533 static int smk_ipv6_check(struct smack_known
*subject
,
2534 struct smack_known
*object
,
2535 struct sockaddr_in6
*address
, int act
)
2538 struct lsm_network_audit net
;
2540 struct smk_audit_info ad
;
2544 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2545 ad
.a
.u
.net
->family
= PF_INET6
;
2546 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2547 if (act
== SMK_RECEIVING
)
2548 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2550 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2552 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2553 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2556 #endif /* CONFIG_IPV6 */
2558 #ifdef SMACK_IPV6_PORT_LABELING
2560 * smk_ipv6_port_label - Smack port access table management
2564 * Create or update the port list entry
2566 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2568 struct sock
*sk
= sock
->sk
;
2569 struct sockaddr_in6
*addr6
;
2570 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2571 struct smk_port_label
*spp
;
2572 unsigned short port
= 0;
2574 if (address
== NULL
) {
2576 * This operation is changing the Smack information
2577 * on the bound socket. Take the changes to the port
2580 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2581 if (sk
!= spp
->smk_sock
)
2583 spp
->smk_in
= ssp
->smk_in
;
2584 spp
->smk_out
= ssp
->smk_out
;
2588 * A NULL address is only used for updating existing
2589 * bound entries. If there isn't one, it's OK.
2594 addr6
= (struct sockaddr_in6
*)address
;
2595 port
= ntohs(addr6
->sin6_port
);
2597 * This is a special case that is safely ignored.
2603 * Look for an existing port list entry.
2604 * This is an indication that a port is getting reused.
2606 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2607 if (spp
->smk_port
!= port
)
2609 spp
->smk_port
= port
;
2611 spp
->smk_in
= ssp
->smk_in
;
2612 spp
->smk_out
= ssp
->smk_out
;
2617 * A new port entry is required.
2619 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2623 spp
->smk_port
= port
;
2625 spp
->smk_in
= ssp
->smk_in
;
2626 spp
->smk_out
= ssp
->smk_out
;
2628 list_add(&spp
->list
, &smk_ipv6_port_list
);
2633 * smk_ipv6_port_check - check Smack port access
2637 * Create or update the port list entry
2639 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2642 struct smk_port_label
*spp
;
2643 struct socket_smack
*ssp
= sk
->sk_security
;
2644 struct smack_known
*skp
= NULL
;
2645 unsigned short port
;
2646 struct smack_known
*object
;
2648 if (act
== SMK_RECEIVING
) {
2649 skp
= smack_ipv6host_label(address
);
2650 object
= ssp
->smk_in
;
2653 object
= smack_ipv6host_label(address
);
2657 * The other end is a single label host.
2659 if (skp
!= NULL
&& object
!= NULL
)
2660 return smk_ipv6_check(skp
, object
, address
, act
);
2662 skp
= smack_net_ambient
;
2664 object
= smack_net_ambient
;
2667 * It's remote, so port lookup does no good.
2669 if (!smk_ipv6_localhost(address
))
2670 return smk_ipv6_check(skp
, object
, address
, act
);
2673 * It's local so the send check has to have passed.
2675 if (act
== SMK_RECEIVING
)
2678 port
= ntohs(address
->sin6_port
);
2679 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2680 if (spp
->smk_port
!= port
)
2682 object
= spp
->smk_in
;
2683 if (act
== SMK_CONNECTING
)
2684 ssp
->smk_packet
= spp
->smk_out
;
2688 return smk_ipv6_check(skp
, object
, address
, act
);
2690 #endif /* SMACK_IPV6_PORT_LABELING */
2693 * smack_inode_setsecurity - set smack xattrs
2694 * @inode: the object
2695 * @name: attribute name
2696 * @value: attribute value
2697 * @size: size of the attribute
2700 * Sets the named attribute in the appropriate blob
2702 * Returns 0 on success, or an error code
2704 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2705 const void *value
, size_t size
, int flags
)
2707 struct smack_known
*skp
;
2708 struct inode_smack
*nsp
= inode
->i_security
;
2709 struct socket_smack
*ssp
;
2710 struct socket
*sock
;
2713 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2716 skp
= smk_import_entry(value
, size
);
2718 return PTR_ERR(skp
);
2720 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2721 nsp
->smk_inode
= skp
;
2722 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2726 * The rest of the Smack xattrs are only on sockets.
2728 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2731 sock
= SOCKET_I(inode
);
2732 if (sock
== NULL
|| sock
->sk
== NULL
)
2735 ssp
= sock
->sk
->sk_security
;
2737 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2739 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2741 if (sock
->sk
->sk_family
== PF_INET
) {
2742 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2745 "Smack: \"%s\" netlbl error %d.\n",
2751 #ifdef SMACK_IPV6_PORT_LABELING
2752 if (sock
->sk
->sk_family
== PF_INET6
)
2753 smk_ipv6_port_label(sock
, NULL
);
2760 * smack_socket_post_create - finish socket setup
2762 * @family: protocol family
2767 * Sets the netlabel information on the socket
2769 * Returns 0 on success, and error code otherwise
2771 static int smack_socket_post_create(struct socket
*sock
, int family
,
2772 int type
, int protocol
, int kern
)
2774 struct socket_smack
*ssp
;
2776 if (sock
->sk
== NULL
)
2780 * Sockets created by kernel threads receive web label.
2782 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2783 ssp
= sock
->sk
->sk_security
;
2784 ssp
->smk_in
= &smack_known_web
;
2785 ssp
->smk_out
= &smack_known_web
;
2788 if (family
!= PF_INET
)
2791 * Set the outbound netlbl.
2793 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2796 #ifdef SMACK_IPV6_PORT_LABELING
2798 * smack_socket_bind - record port binding information.
2800 * @address: the port address
2801 * @addrlen: size of the address
2803 * Records the label bound to a port.
2807 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2810 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2811 smk_ipv6_port_label(sock
, address
);
2814 #endif /* SMACK_IPV6_PORT_LABELING */
2817 * smack_socket_connect - connect access check
2819 * @sap: the other end
2820 * @addrlen: size of sap
2822 * Verifies that a connection may be possible
2824 * Returns 0 on success, and error code otherwise
2826 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2830 #if IS_ENABLED(CONFIG_IPV6)
2831 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2833 #ifdef SMACK_IPV6_SECMARK_LABELING
2834 struct smack_known
*rsp
;
2835 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2838 if (sock
->sk
== NULL
)
2841 switch (sock
->sk
->sk_family
) {
2843 if (addrlen
< sizeof(struct sockaddr_in
))
2845 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2848 if (addrlen
< sizeof(struct sockaddr_in6
))
2850 #ifdef SMACK_IPV6_SECMARK_LABELING
2851 rsp
= smack_ipv6host_label(sip
);
2853 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2856 #ifdef SMACK_IPV6_PORT_LABELING
2857 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2865 * smack_flags_to_may - convert S_ to MAY_ values
2866 * @flags: the S_ value
2868 * Returns the equivalent MAY_ value
2870 static int smack_flags_to_may(int flags
)
2874 if (flags
& S_IRUGO
)
2876 if (flags
& S_IWUGO
)
2878 if (flags
& S_IXUGO
)
2885 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2890 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2892 struct smack_known
*skp
= smk_of_current();
2894 msg
->security
= skp
;
2899 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2902 * Clears the blob pointer
2904 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2906 msg
->security
= NULL
;
2910 * smack_of_shm - the smack pointer for the shm
2913 * Returns a pointer to the smack value
2915 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2917 return (struct smack_known
*)shp
->shm_perm
.security
;
2921 * smack_shm_alloc_security - Set the security blob for shm
2926 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2928 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2929 struct smack_known
*skp
= smk_of_current();
2931 isp
->security
= skp
;
2936 * smack_shm_free_security - Clear the security blob for shm
2939 * Clears the blob pointer
2941 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2943 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2945 isp
->security
= NULL
;
2949 * smk_curacc_shm : check if current has access on shm
2951 * @access : access requested
2953 * Returns 0 if current has the requested access, error code otherwise
2955 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2957 struct smack_known
*ssp
= smack_of_shm(shp
);
2958 struct smk_audit_info ad
;
2962 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2963 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2965 rc
= smk_curacc(ssp
, access
, &ad
);
2966 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2971 * smack_shm_associate - Smack access check for shm
2973 * @shmflg: access requested
2975 * Returns 0 if current has the requested access, error code otherwise
2977 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2981 may
= smack_flags_to_may(shmflg
);
2982 return smk_curacc_shm(shp
, may
);
2986 * smack_shm_shmctl - Smack access check for shm
2988 * @cmd: what it wants to do
2990 * Returns 0 if current has the requested access, error code otherwise
2992 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
3005 may
= MAY_READWRITE
;
3010 * System level information.
3016 return smk_curacc_shm(shp
, may
);
3020 * smack_shm_shmat - Smack access for shmat
3023 * @shmflg: access requested
3025 * Returns 0 if current has the requested access, error code otherwise
3027 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
3032 may
= smack_flags_to_may(shmflg
);
3033 return smk_curacc_shm(shp
, may
);
3037 * smack_of_sem - the smack pointer for the sem
3040 * Returns a pointer to the smack value
3042 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
3044 return (struct smack_known
*)sma
->sem_perm
.security
;
3048 * smack_sem_alloc_security - Set the security blob for sem
3053 static int smack_sem_alloc_security(struct sem_array
*sma
)
3055 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3056 struct smack_known
*skp
= smk_of_current();
3058 isp
->security
= skp
;
3063 * smack_sem_free_security - Clear the security blob for sem
3066 * Clears the blob pointer
3068 static void smack_sem_free_security(struct sem_array
*sma
)
3070 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3072 isp
->security
= NULL
;
3076 * smk_curacc_sem : check if current has access on sem
3078 * @access : access requested
3080 * Returns 0 if current has the requested access, error code otherwise
3082 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3084 struct smack_known
*ssp
= smack_of_sem(sma
);
3085 struct smk_audit_info ad
;
3089 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3090 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3092 rc
= smk_curacc(ssp
, access
, &ad
);
3093 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3098 * smack_sem_associate - Smack access check for sem
3100 * @semflg: access requested
3102 * Returns 0 if current has the requested access, error code otherwise
3104 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3108 may
= smack_flags_to_may(semflg
);
3109 return smk_curacc_sem(sma
, may
);
3113 * smack_sem_shmctl - Smack access check for sem
3115 * @cmd: what it wants to do
3117 * Returns 0 if current has the requested access, error code otherwise
3119 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3137 may
= MAY_READWRITE
;
3142 * System level information
3149 return smk_curacc_sem(sma
, may
);
3153 * smack_sem_semop - Smack checks of semaphore operations
3159 * Treated as read and write in all cases.
3161 * Returns 0 if access is allowed, error code otherwise
3163 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3164 unsigned nsops
, int alter
)
3166 return smk_curacc_sem(sma
, MAY_READWRITE
);
3170 * smack_msg_alloc_security - Set the security blob for msg
3175 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3177 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3178 struct smack_known
*skp
= smk_of_current();
3180 kisp
->security
= skp
;
3185 * smack_msg_free_security - Clear the security blob for msg
3188 * Clears the blob pointer
3190 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3192 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3194 kisp
->security
= NULL
;
3198 * smack_of_msq - the smack pointer for the msq
3201 * Returns a pointer to the smack label entry
3203 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3205 return (struct smack_known
*)msq
->q_perm
.security
;
3209 * smk_curacc_msq : helper to check if current has access on msq
3211 * @access : access requested
3213 * return 0 if current has access, error otherwise
3215 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3217 struct smack_known
*msp
= smack_of_msq(msq
);
3218 struct smk_audit_info ad
;
3222 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3223 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3225 rc
= smk_curacc(msp
, access
, &ad
);
3226 rc
= smk_bu_current("msq", msp
, access
, rc
);
3231 * smack_msg_queue_associate - Smack access check for msg_queue
3233 * @msqflg: access requested
3235 * Returns 0 if current has the requested access, error code otherwise
3237 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3241 may
= smack_flags_to_may(msqflg
);
3242 return smk_curacc_msq(msq
, may
);
3246 * smack_msg_queue_msgctl - Smack access check for msg_queue
3248 * @cmd: what it wants to do
3250 * Returns 0 if current has the requested access, error code otherwise
3252 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3263 may
= MAY_READWRITE
;
3268 * System level information
3275 return smk_curacc_msq(msq
, may
);
3279 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3282 * @msqflg: access requested
3284 * Returns 0 if current has the requested access, error code otherwise
3286 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3291 may
= smack_flags_to_may(msqflg
);
3292 return smk_curacc_msq(msq
, may
);
3296 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3303 * Returns 0 if current has read and write access, error code otherwise
3305 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3306 struct task_struct
*target
, long type
, int mode
)
3308 return smk_curacc_msq(msq
, MAY_READWRITE
);
3312 * smack_ipc_permission - Smack access for ipc_permission()
3313 * @ipp: the object permissions
3314 * @flag: access requested
3316 * Returns 0 if current has read and write access, error code otherwise
3318 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3320 struct smack_known
*iskp
= ipp
->security
;
3321 int may
= smack_flags_to_may(flag
);
3322 struct smk_audit_info ad
;
3326 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3327 ad
.a
.u
.ipc_id
= ipp
->id
;
3329 rc
= smk_curacc(iskp
, may
, &ad
);
3330 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3335 * smack_ipc_getsecid - Extract smack security id
3336 * @ipp: the object permissions
3337 * @secid: where result will be saved
3339 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3341 struct smack_known
*iskp
= ipp
->security
;
3343 *secid
= iskp
->smk_secid
;
3347 * smack_d_instantiate - Make sure the blob is correct on an inode
3348 * @opt_dentry: dentry where inode will be attached
3349 * @inode: the object
3351 * Set the inode's security blob if it hasn't been done already.
3353 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3355 struct super_block
*sbp
;
3356 struct superblock_smack
*sbsp
;
3357 struct inode_smack
*isp
;
3358 struct smack_known
*skp
;
3359 struct smack_known
*ckp
= smk_of_current();
3360 struct smack_known
*final
;
3361 char trattr
[TRANS_TRUE_SIZE
];
3369 isp
= inode
->i_security
;
3371 mutex_lock(&isp
->smk_lock
);
3373 * If the inode is already instantiated
3374 * take the quick way out
3376 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3380 sbsp
= sbp
->s_security
;
3382 * We're going to use the superblock default label
3383 * if there's no label on the file.
3385 final
= sbsp
->smk_default
;
3388 * If this is the root inode the superblock
3389 * may be in the process of initialization.
3390 * If that is the case use the root value out
3391 * of the superblock.
3393 if (opt_dentry
->d_parent
== opt_dentry
) {
3394 switch (sbp
->s_magic
) {
3395 case CGROUP_SUPER_MAGIC
:
3397 * The cgroup filesystem is never mounted,
3398 * so there's no opportunity to set the mount
3401 sbsp
->smk_root
= &smack_known_star
;
3402 sbsp
->smk_default
= &smack_known_star
;
3403 isp
->smk_inode
= sbsp
->smk_root
;
3407 * What about shmem/tmpfs anonymous files with dentry
3408 * obtained from d_alloc_pseudo()?
3410 isp
->smk_inode
= smk_of_current();
3413 isp
->smk_inode
= smk_of_current();
3416 isp
->smk_inode
= sbsp
->smk_root
;
3419 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3424 * This is pretty hackish.
3425 * Casey says that we shouldn't have to do
3426 * file system specific code, but it does help
3427 * with keeping it simple.
3429 switch (sbp
->s_magic
) {
3433 case CGROUP_SUPER_MAGIC
:
3435 * Casey says that it's a little embarrassing
3436 * that the smack file system doesn't do
3437 * extended attributes.
3439 * Casey says pipes are easy (?)
3441 * Socket access is controlled by the socket
3442 * structures associated with the task involved.
3444 * Cgroupfs is special
3446 final
= &smack_known_star
;
3448 case DEVPTS_SUPER_MAGIC
:
3450 * devpts seems content with the label of the task.
3451 * Programs that change smack have to treat the
3456 case PROC_SUPER_MAGIC
:
3458 * Casey says procfs appears not to care.
3459 * The superblock default suffices.
3464 * Device labels should come from the filesystem,
3465 * but watch out, because they're volitile,
3466 * getting recreated on every reboot.
3468 final
= &smack_known_star
;
3472 * If a smack value has been set we want to use it,
3473 * but since tmpfs isn't giving us the opportunity
3474 * to set mount options simulate setting the
3475 * superblock default.
3479 * This isn't an understood special case.
3480 * Get the value from the xattr.
3484 * UNIX domain sockets use lower level socket data.
3486 if (S_ISSOCK(inode
->i_mode
)) {
3487 final
= &smack_known_star
;
3491 * No xattr support means, alas, no SMACK label.
3492 * Use the aforeapplied default.
3493 * It would be curious if the label of the task
3494 * does not match that assigned.
3496 if (inode
->i_op
->getxattr
== NULL
)
3499 * Get the dentry for xattr.
3501 dp
= dget(opt_dentry
);
3502 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3503 if (!IS_ERR_OR_NULL(skp
))
3507 * Transmuting directory
3509 if (S_ISDIR(inode
->i_mode
)) {
3511 * If this is a new directory and the label was
3512 * transmuted when the inode was initialized
3513 * set the transmute attribute on the directory
3514 * and mark the inode.
3516 * If there is a transmute attribute on the
3517 * directory mark the inode.
3519 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3520 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3521 rc
= inode
->i_op
->setxattr(dp
,
3522 XATTR_NAME_SMACKTRANSMUTE
,
3523 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3526 rc
= inode
->i_op
->getxattr(dp
,
3527 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3529 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3530 TRANS_TRUE_SIZE
) != 0)
3534 transflag
= SMK_INODE_TRANSMUTE
;
3537 * Don't let the exec or mmap label be "*" or "@".
3539 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3540 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3541 skp
== &smack_known_web
)
3543 isp
->smk_task
= skp
;
3545 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3546 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3547 skp
== &smack_known_web
)
3549 isp
->smk_mmap
= skp
;
3556 isp
->smk_inode
= ckp
;
3558 isp
->smk_inode
= final
;
3560 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3563 mutex_unlock(&isp
->smk_lock
);
3568 * smack_getprocattr - Smack process attribute access
3569 * @p: the object task
3570 * @name: the name of the attribute in /proc/.../attr
3571 * @value: where to put the result
3573 * Places a copy of the task Smack into value
3575 * Returns the length of the smack label or an error code
3577 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3579 struct smack_known
*skp
= smk_of_task_struct(p
);
3583 if (strcmp(name
, "current") != 0)
3586 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3596 * smack_setprocattr - Smack process attribute setting
3597 * @p: the object task
3598 * @name: the name of the attribute in /proc/.../attr
3599 * @value: the value to set
3600 * @size: the size of the value
3602 * Sets the Smack value of the task. Only setting self
3603 * is permitted and only with privilege
3605 * Returns the length of the smack label or an error code
3607 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3608 void *value
, size_t size
)
3610 struct task_smack
*tsp
= current_security();
3612 struct smack_known
*skp
;
3613 struct smack_known_list_elem
*sklep
;
3617 * Changing another process' Smack value is too dangerous
3618 * and supports no sane use case.
3623 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3626 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3629 if (strcmp(name
, "current") != 0)
3632 skp
= smk_import_entry(value
, size
);
3634 return PTR_ERR(skp
);
3637 * No process is ever allowed the web ("@") label.
3639 if (skp
== &smack_known_web
)
3642 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3644 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3645 if (sklep
->smk_label
== skp
) {
3653 new = prepare_creds();
3657 tsp
= new->security
;
3658 tsp
->smk_task
= skp
;
3660 * process can change its label only once
3662 smk_destroy_label_list(&tsp
->smk_relabel
);
3669 * smack_unix_stream_connect - Smack access on UDS
3671 * @other: the other sock
3674 * Return 0 if a subject with the smack of sock could access
3675 * an object with the smack of other, otherwise an error code
3677 static int smack_unix_stream_connect(struct sock
*sock
,
3678 struct sock
*other
, struct sock
*newsk
)
3680 struct smack_known
*skp
;
3681 struct smack_known
*okp
;
3682 struct socket_smack
*ssp
= sock
->sk_security
;
3683 struct socket_smack
*osp
= other
->sk_security
;
3684 struct socket_smack
*nsp
= newsk
->sk_security
;
3685 struct smk_audit_info ad
;
3688 struct lsm_network_audit net
;
3691 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3695 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3696 smk_ad_setfield_u_net_sk(&ad
, other
);
3698 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3699 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3703 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3704 rc
= smk_bu_note("UDS connect", okp
, skp
,
3710 * Cross reference the peer labels for SO_PEERSEC.
3713 nsp
->smk_packet
= ssp
->smk_out
;
3714 ssp
->smk_packet
= osp
->smk_out
;
3721 * smack_unix_may_send - Smack access on UDS
3723 * @other: the other socket
3725 * Return 0 if a subject with the smack of sock could access
3726 * an object with the smack of other, otherwise an error code
3728 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3730 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3731 struct socket_smack
*osp
= other
->sk
->sk_security
;
3732 struct smk_audit_info ad
;
3736 struct lsm_network_audit net
;
3738 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3739 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3742 if (smack_privileged(CAP_MAC_OVERRIDE
))
3745 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3746 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3751 * smack_socket_sendmsg - Smack check based on destination host
3754 * @size: the size of the message
3756 * Return 0 if the current subject can write to the destination host.
3757 * For IPv4 this is only a question if the destination is a single label host.
3758 * For IPv6 this is a check against the label of the port.
3760 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3763 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3764 #if IS_ENABLED(CONFIG_IPV6)
3765 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3767 #ifdef SMACK_IPV6_SECMARK_LABELING
3768 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3769 struct smack_known
*rsp
;
3774 * Perfectly reasonable for this to be NULL
3779 switch (sock
->sk
->sk_family
) {
3781 rc
= smack_netlabel_send(sock
->sk
, sip
);
3784 #ifdef SMACK_IPV6_SECMARK_LABELING
3785 rsp
= smack_ipv6host_label(sap
);
3787 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3790 #ifdef SMACK_IPV6_PORT_LABELING
3791 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3799 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3800 * @sap: netlabel secattr
3801 * @ssp: socket security information
3803 * Returns a pointer to a Smack label entry found on the label list.
3805 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3806 struct socket_smack
*ssp
)
3808 struct smack_known
*skp
;
3813 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3815 * Looks like a CIPSO packet.
3816 * If there are flags but no level netlabel isn't
3817 * behaving the way we expect it to.
3819 * Look it up in the label table
3820 * Without guidance regarding the smack value
3821 * for the packet fall back on the network
3825 list_for_each_entry(skp
, &smack_known_list
, list
) {
3826 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3829 * Compare the catsets. Use the netlbl APIs.
3831 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3832 if ((skp
->smk_netlabel
.flags
&
3833 NETLBL_SECATTR_MLS_CAT
) == 0)
3837 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3838 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3840 kcat
= netlbl_catmap_walk(
3841 skp
->smk_netlabel
.attr
.mls
.cat
,
3843 if (acat
< 0 || kcat
< 0)
3856 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3857 return &smack_known_web
;
3858 return &smack_known_star
;
3860 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3862 * Looks like a fallback, which gives us a secid.
3864 skp
= smack_from_secid(sap
->attr
.secid
);
3866 * This has got to be a bug because it is
3867 * impossible to specify a fallback without
3868 * specifying the label, which will ensure
3869 * it has a secid, and the only way to get a
3870 * secid is from a fallback.
3872 BUG_ON(skp
== NULL
);
3876 * Without guidance regarding the smack value
3877 * for the packet fall back on the network
3880 return smack_net_ambient
;
3883 #if IS_ENABLED(CONFIG_IPV6)
3884 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3888 int proto
= -EINVAL
;
3889 struct ipv6hdr _ipv6h
;
3890 struct ipv6hdr
*ip6
;
3892 struct tcphdr _tcph
, *th
;
3893 struct udphdr _udph
, *uh
;
3894 struct dccp_hdr _dccph
, *dh
;
3898 offset
= skb_network_offset(skb
);
3899 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3902 sip
->sin6_addr
= ip6
->saddr
;
3904 nexthdr
= ip6
->nexthdr
;
3905 offset
+= sizeof(_ipv6h
);
3906 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3913 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3915 sip
->sin6_port
= th
->source
;
3918 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3920 sip
->sin6_port
= uh
->source
;
3923 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3925 sip
->sin6_port
= dh
->dccph_sport
;
3930 #endif /* CONFIG_IPV6 */
3933 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3937 * Returns 0 if the packet should be delivered, an error code otherwise
3939 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3941 struct netlbl_lsm_secattr secattr
;
3942 struct socket_smack
*ssp
= sk
->sk_security
;
3943 struct smack_known
*skp
= NULL
;
3945 struct smk_audit_info ad
;
3947 struct lsm_network_audit net
;
3949 #if IS_ENABLED(CONFIG_IPV6)
3950 struct sockaddr_in6 sadd
;
3952 #endif /* CONFIG_IPV6 */
3954 switch (sk
->sk_family
) {
3956 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3958 * If there is a secmark use it rather than the CIPSO label.
3959 * If there is no secmark fall back to CIPSO.
3960 * The secmark is assumed to reflect policy better.
3962 if (skb
&& skb
->secmark
!= 0) {
3963 skp
= smack_from_secid(skb
->secmark
);
3966 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3968 * Translate what netlabel gave us.
3970 netlbl_secattr_init(&secattr
);
3972 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3974 skp
= smack_from_secattr(&secattr
, ssp
);
3976 skp
= smack_net_ambient
;
3978 netlbl_secattr_destroy(&secattr
);
3980 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3984 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3985 ad
.a
.u
.net
->family
= sk
->sk_family
;
3986 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3987 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3990 * Receiving a packet requires that the other end
3991 * be able to write here. Read access is not required.
3992 * This is the simplist possible security model
3995 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3996 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3999 netlbl_skbuff_err(skb
, rc
, 0);
4001 #if IS_ENABLED(CONFIG_IPV6)
4003 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
4004 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
4006 #ifdef SMACK_IPV6_SECMARK_LABELING
4007 if (skb
&& skb
->secmark
!= 0)
4008 skp
= smack_from_secid(skb
->secmark
);
4010 skp
= smack_ipv6host_label(&sadd
);
4012 skp
= smack_net_ambient
;
4014 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4015 ad
.a
.u
.net
->family
= sk
->sk_family
;
4016 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4017 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4018 #endif /* CONFIG_AUDIT */
4019 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4020 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4022 #endif /* SMACK_IPV6_SECMARK_LABELING */
4023 #ifdef SMACK_IPV6_PORT_LABELING
4024 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4025 #endif /* SMACK_IPV6_PORT_LABELING */
4027 #endif /* CONFIG_IPV6 */
4034 * smack_socket_getpeersec_stream - pull in packet label
4036 * @optval: user's destination
4037 * @optlen: size thereof
4040 * returns zero on success, an error code otherwise
4042 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4043 char __user
*optval
,
4044 int __user
*optlen
, unsigned len
)
4046 struct socket_smack
*ssp
;
4051 ssp
= sock
->sk
->sk_security
;
4052 if (ssp
->smk_packet
!= NULL
) {
4053 rcp
= ssp
->smk_packet
->smk_known
;
4054 slen
= strlen(rcp
) + 1;
4059 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4062 if (put_user(slen
, optlen
) != 0)
4070 * smack_socket_getpeersec_dgram - pull in packet label
4071 * @sock: the peer socket
4073 * @secid: pointer to where to put the secid of the packet
4075 * Sets the netlabel socket state on sk from parent
4077 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4078 struct sk_buff
*skb
, u32
*secid
)
4081 struct netlbl_lsm_secattr secattr
;
4082 struct socket_smack
*ssp
= NULL
;
4083 struct smack_known
*skp
;
4084 int family
= PF_UNSPEC
;
4085 u32 s
= 0; /* 0 is the invalid secid */
4089 if (skb
->protocol
== htons(ETH_P_IP
))
4091 #if IS_ENABLED(CONFIG_IPV6)
4092 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4094 #endif /* CONFIG_IPV6 */
4096 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4097 family
= sock
->sk
->sk_family
;
4101 ssp
= sock
->sk
->sk_security
;
4102 s
= ssp
->smk_out
->smk_secid
;
4105 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4111 * Translate what netlabel gave us.
4113 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4114 ssp
= sock
->sk
->sk_security
;
4115 netlbl_secattr_init(&secattr
);
4116 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4118 skp
= smack_from_secattr(&secattr
, ssp
);
4121 netlbl_secattr_destroy(&secattr
);
4124 #ifdef SMACK_IPV6_SECMARK_LABELING
4136 * smack_sock_graft - Initialize a newly created socket with an existing sock
4138 * @parent: parent socket
4140 * Set the smk_{in,out} state of an existing sock based on the process that
4141 * is creating the new socket.
4143 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4145 struct socket_smack
*ssp
;
4146 struct smack_known
*skp
= smk_of_current();
4149 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4152 ssp
= sk
->sk_security
;
4155 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4159 * smack_inet_conn_request - Smack access check on connect
4160 * @sk: socket involved
4164 * Returns 0 if a task with the packet label could write to
4165 * the socket, otherwise an error code
4167 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4168 struct request_sock
*req
)
4170 u16 family
= sk
->sk_family
;
4171 struct smack_known
*skp
;
4172 struct socket_smack
*ssp
= sk
->sk_security
;
4173 struct netlbl_lsm_secattr secattr
;
4174 struct sockaddr_in addr
;
4176 struct smack_known
*hskp
;
4178 struct smk_audit_info ad
;
4180 struct lsm_network_audit net
;
4183 #if IS_ENABLED(CONFIG_IPV6)
4184 if (family
== PF_INET6
) {
4186 * Handle mapped IPv4 packets arriving
4187 * via IPv6 sockets. Don't set up netlabel
4188 * processing on IPv6.
4190 if (skb
->protocol
== htons(ETH_P_IP
))
4195 #endif /* CONFIG_IPV6 */
4197 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4199 * If there is a secmark use it rather than the CIPSO label.
4200 * If there is no secmark fall back to CIPSO.
4201 * The secmark is assumed to reflect policy better.
4203 if (skb
&& skb
->secmark
!= 0) {
4204 skp
= smack_from_secid(skb
->secmark
);
4207 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4209 netlbl_secattr_init(&secattr
);
4210 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4212 skp
= smack_from_secattr(&secattr
, ssp
);
4214 skp
= &smack_known_huh
;
4215 netlbl_secattr_destroy(&secattr
);
4217 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4222 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4223 ad
.a
.u
.net
->family
= family
;
4224 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4225 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4228 * Receiving a packet requires that the other end be able to write
4229 * here. Read access is not required.
4231 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4232 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4237 * Save the peer's label in the request_sock so we can later setup
4238 * smk_packet in the child socket so that SO_PEERCRED can report it.
4240 req
->peer_secid
= skp
->smk_secid
;
4243 * We need to decide if we want to label the incoming connection here
4244 * if we do we only need to label the request_sock and the stack will
4245 * propagate the wire-label to the sock when it is created.
4248 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4250 hskp
= smack_ipv4host_label(&addr
);
4254 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4256 netlbl_req_delattr(req
);
4262 * smack_inet_csk_clone - Copy the connection information to the new socket
4263 * @sk: the new socket
4264 * @req: the connection's request_sock
4266 * Transfer the connection's peer label to the newly created socket.
4268 static void smack_inet_csk_clone(struct sock
*sk
,
4269 const struct request_sock
*req
)
4271 struct socket_smack
*ssp
= sk
->sk_security
;
4272 struct smack_known
*skp
;
4274 if (req
->peer_secid
!= 0) {
4275 skp
= smack_from_secid(req
->peer_secid
);
4276 ssp
->smk_packet
= skp
;
4278 ssp
->smk_packet
= NULL
;
4282 * Key management security hooks
4284 * Casey has not tested key support very heavily.
4285 * The permission check is most likely too restrictive.
4286 * If you care about keys please have a look.
4291 * smack_key_alloc - Set the key security blob
4293 * @cred: the credentials to use
4296 * No allocation required
4300 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4301 unsigned long flags
)
4303 struct smack_known
*skp
= smk_of_task(cred
->security
);
4305 key
->security
= skp
;
4310 * smack_key_free - Clear the key security blob
4313 * Clear the blob pointer
4315 static void smack_key_free(struct key
*key
)
4317 key
->security
= NULL
;
4321 * smack_key_permission - Smack access on a key
4322 * @key_ref: gets to the object
4323 * @cred: the credentials to use
4324 * @perm: requested key permissions
4326 * Return 0 if the task has read and write to the object,
4327 * an error code otherwise
4329 static int smack_key_permission(key_ref_t key_ref
,
4330 const struct cred
*cred
, unsigned perm
)
4333 struct smk_audit_info ad
;
4334 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4338 keyp
= key_ref_to_ptr(key_ref
);
4342 * If the key hasn't been initialized give it access so that
4345 if (keyp
->security
== NULL
)
4348 * This should not occur
4353 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4354 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4355 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4357 if (perm
& KEY_NEED_READ
)
4359 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4360 request
= MAY_WRITE
;
4361 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4362 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4367 * smack_key_getsecurity - Smack label tagging the key
4368 * @key points to the key to be queried
4369 * @_buffer points to a pointer that should be set to point to the
4370 * resulting string (if no label or an error occurs).
4371 * Return the length of the string (including terminating NUL) or -ve if
4373 * May also return 0 (and a NULL buffer pointer) if there is no label.
4375 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4377 struct smack_known
*skp
= key
->security
;
4381 if (key
->security
== NULL
) {
4386 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4389 length
= strlen(copy
) + 1;
4395 #endif /* CONFIG_KEYS */
4400 * Audit requires a unique representation of each Smack specific
4401 * rule. This unique representation is used to distinguish the
4402 * object to be audited from remaining kernel objects and also
4403 * works as a glue between the audit hooks.
4405 * Since repository entries are added but never deleted, we'll use
4406 * the smack_known label address related to the given audit rule as
4407 * the needed unique representation. This also better fits the smack
4408 * model where nearly everything is a label.
4413 * smack_audit_rule_init - Initialize a smack audit rule
4414 * @field: audit rule fields given from user-space (audit.h)
4415 * @op: required testing operator (=, !=, >, <, ...)
4416 * @rulestr: smack label to be audited
4417 * @vrule: pointer to save our own audit rule representation
4419 * Prepare to audit cases where (@field @op @rulestr) is true.
4420 * The label to be audited is created if necessay.
4422 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4424 struct smack_known
*skp
;
4425 char **rule
= (char **)vrule
;
4428 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4431 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4434 skp
= smk_import_entry(rulestr
, 0);
4436 return PTR_ERR(skp
);
4438 *rule
= skp
->smk_known
;
4444 * smack_audit_rule_known - Distinguish Smack audit rules
4445 * @krule: rule of interest, in Audit kernel representation format
4447 * This is used to filter Smack rules from remaining Audit ones.
4448 * If it's proved that this rule belongs to us, the
4449 * audit_rule_match hook will be called to do the final judgement.
4451 static int smack_audit_rule_known(struct audit_krule
*krule
)
4453 struct audit_field
*f
;
4456 for (i
= 0; i
< krule
->field_count
; i
++) {
4457 f
= &krule
->fields
[i
];
4459 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4467 * smack_audit_rule_match - Audit given object ?
4468 * @secid: security id for identifying the object to test
4469 * @field: audit rule flags given from user-space
4470 * @op: required testing operator
4471 * @vrule: smack internal rule presentation
4472 * @actx: audit context associated with the check
4474 * The core Audit hook. It's used to take the decision of
4475 * whether to audit or not to audit a given object.
4477 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4478 struct audit_context
*actx
)
4480 struct smack_known
*skp
;
4483 if (unlikely(!rule
)) {
4484 WARN_ONCE(1, "Smack: missing rule\n");
4488 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4491 skp
= smack_from_secid(secid
);
4494 * No need to do string comparisons. If a match occurs,
4495 * both pointers will point to the same smack_known
4498 if (op
== Audit_equal
)
4499 return (rule
== skp
->smk_known
);
4500 if (op
== Audit_not_equal
)
4501 return (rule
!= skp
->smk_known
);
4507 * smack_audit_rule_free - free smack rule representation
4508 * @vrule: rule to be freed.
4510 * No memory was allocated.
4512 static void smack_audit_rule_free(void *vrule
)
4517 #endif /* CONFIG_AUDIT */
4520 * smack_ismaclabel - check if xattr @name references a smack MAC label
4521 * @name: Full xattr name to check.
4523 static int smack_ismaclabel(const char *name
)
4525 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4530 * smack_secid_to_secctx - return the smack label for a secid
4531 * @secid: incoming integer
4532 * @secdata: destination
4533 * @seclen: how long it is
4535 * Exists for networking code.
4537 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4539 struct smack_known
*skp
= smack_from_secid(secid
);
4542 *secdata
= skp
->smk_known
;
4543 *seclen
= strlen(skp
->smk_known
);
4548 * smack_secctx_to_secid - return the secid for a smack label
4549 * @secdata: smack label
4550 * @seclen: how long result is
4551 * @secid: outgoing integer
4553 * Exists for audit and networking code.
4555 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4557 struct smack_known
*skp
= smk_find_entry(secdata
);
4560 *secid
= skp
->smk_secid
;
4567 * smack_release_secctx - don't do anything.
4571 * Exists to make sure nothing gets done, and properly
4573 static void smack_release_secctx(char *secdata
, u32 seclen
)
4577 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4579 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4582 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4584 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4587 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4590 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4598 static struct security_hook_list smack_hooks
[] = {
4599 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4600 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4601 LSM_HOOK_INIT(syslog
, smack_syslog
),
4603 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4604 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4605 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4606 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4607 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4608 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4609 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4611 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4612 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4613 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4615 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4616 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4617 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4618 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4619 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4620 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4621 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4622 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4623 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4624 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4625 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4626 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4627 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4628 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4629 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4630 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4631 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4632 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4634 LSM_HOOK_INIT(file_permission
, smack_file_permission
),
4635 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4636 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4637 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4638 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4639 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4640 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4641 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4642 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4643 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4644 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4646 LSM_HOOK_INIT(file_open
, smack_file_open
),
4648 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4649 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4650 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4651 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4652 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4653 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4654 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4655 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4656 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4657 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4658 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4659 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4660 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4661 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4662 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4663 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4664 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4665 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4666 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4668 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4669 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4671 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4672 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4674 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4675 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4676 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4677 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4678 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4679 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4681 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4682 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4683 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4684 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4685 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4687 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4688 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4689 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4690 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4691 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4693 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4695 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4696 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4698 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4699 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4701 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4702 #ifdef SMACK_IPV6_PORT_LABELING
4703 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4705 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4706 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4707 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4708 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4709 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4710 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4711 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4712 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4713 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4714 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4716 /* key management security hooks */
4718 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4719 LSM_HOOK_INIT(key_free
, smack_key_free
),
4720 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4721 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4722 #endif /* CONFIG_KEYS */
4726 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4727 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4728 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4729 LSM_HOOK_INIT(audit_rule_free
, smack_audit_rule_free
),
4730 #endif /* CONFIG_AUDIT */
4732 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4733 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4734 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4735 LSM_HOOK_INIT(release_secctx
, smack_release_secctx
),
4736 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4737 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4738 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4742 static __init
void init_smack_known_list(void)
4745 * Initialize rule list locks
4747 mutex_init(&smack_known_huh
.smk_rules_lock
);
4748 mutex_init(&smack_known_hat
.smk_rules_lock
);
4749 mutex_init(&smack_known_floor
.smk_rules_lock
);
4750 mutex_init(&smack_known_star
.smk_rules_lock
);
4751 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4752 mutex_init(&smack_known_web
.smk_rules_lock
);
4754 * Initialize rule lists
4756 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4757 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4758 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4759 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4760 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4761 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4763 * Create the known labels list
4765 smk_insert_entry(&smack_known_huh
);
4766 smk_insert_entry(&smack_known_hat
);
4767 smk_insert_entry(&smack_known_star
);
4768 smk_insert_entry(&smack_known_floor
);
4769 smk_insert_entry(&smack_known_invalid
);
4770 smk_insert_entry(&smack_known_web
);
4774 * smack_init - initialize the smack system
4778 static __init
int smack_init(void)
4781 struct task_smack
*tsp
;
4783 if (!security_module_enable("smack"))
4786 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4787 if (!smack_inode_cache
)
4790 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4793 kmem_cache_destroy(smack_inode_cache
);
4799 pr_info("Smack: Initializing.\n");
4800 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4801 pr_info("Smack: Netfilter enabled.\n");
4803 #ifdef SMACK_IPV6_PORT_LABELING
4804 pr_info("Smack: IPv6 port labeling enabled.\n");
4806 #ifdef SMACK_IPV6_SECMARK_LABELING
4807 pr_info("Smack: IPv6 Netfilter enabled.\n");
4811 * Set the security state for the initial task.
4813 cred
= (struct cred
*) current
->cred
;
4814 cred
->security
= tsp
;
4816 /* initialize the smack_known_list */
4817 init_smack_known_list();
4822 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4828 * Smack requires early initialization in order to label
4829 * all processes and objects when they are created.
4831 security_initcall(smack_init
);