2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 DEFINE_MUTEX(smack_ipv6_lock
);
56 static LIST_HEAD(smk_ipv6_port_list
);
58 static struct kmem_cache
*smack_inode_cache
;
61 static const match_table_t smk_mount_tokens
= {
62 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
63 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
64 {Opt_fshat
, SMK_FSHAT
"%s"},
65 {Opt_fsroot
, SMK_FSROOT
"%s"},
66 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
71 static char *smk_bu_mess
[] = {
72 "Bringup Error", /* Unused */
73 "Bringup", /* SMACK_BRINGUP_ALLOW */
74 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
75 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
78 static void smk_bu_mode(int mode
, char *s
)
88 if (mode
& MAY_APPEND
)
90 if (mode
& MAY_TRANSMUTE
)
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
102 struct smack_known
*oskp
, int mode
, int rc
)
104 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
108 if (rc
> SMACK_UNCONFINED_OBJECT
)
111 smk_bu_mode(mode
, acc
);
112 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
113 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
124 struct task_smack
*tsp
= current_security();
125 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
129 if (rc
> SMACK_UNCONFINED_OBJECT
)
132 smk_bu_mode(mode
, acc
);
133 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
134 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
135 acc
, current
->comm
, note
);
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
145 struct task_smack
*tsp
= current_security();
146 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
147 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
151 if (rc
> SMACK_UNCONFINED_OBJECT
)
154 smk_bu_mode(mode
, acc
);
155 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
156 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
157 current
->comm
, otp
->comm
);
161 #define smk_bu_task(otp, mode, RC) (RC)
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
167 struct task_smack
*tsp
= current_security();
168 struct inode_smack
*isp
= inode
->i_security
;
169 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
171 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
172 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
177 if (rc
> SMACK_UNCONFINED_OBJECT
)
179 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
180 (mode
& (MAY_WRITE
| MAY_APPEND
)))
181 isp
->smk_flags
|= SMK_INODE_IMPURE
;
183 smk_bu_mode(mode
, acc
);
185 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
186 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
187 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
191 #define smk_bu_inode(inode, mode, RC) (RC)
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
197 struct task_smack
*tsp
= current_security();
198 struct smack_known
*sskp
= tsp
->smk_task
;
199 struct inode
*inode
= file_inode(file
);
200 struct inode_smack
*isp
= inode
->i_security
;
201 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
203 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
204 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
209 if (rc
> SMACK_UNCONFINED_OBJECT
)
212 smk_bu_mode(mode
, acc
);
213 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
214 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
215 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
220 #define smk_bu_file(file, mode, RC) (RC)
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
227 struct task_smack
*tsp
= cred
->security
;
228 struct smack_known
*sskp
= tsp
->smk_task
;
229 struct inode
*inode
= file_inode(file
);
230 struct inode_smack
*isp
= inode
->i_security
;
231 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
233 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
234 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
239 if (rc
> SMACK_UNCONFINED_OBJECT
)
242 smk_bu_mode(mode
, acc
);
243 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
244 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
245 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
254 * smk_fetch - Fetch the smack label from a file.
255 * @name: type of the label (attribute)
256 * @ip: a pointer to the inode
257 * @dp: a pointer to the dentry
259 * Returns a pointer to the master list entry for the Smack label,
260 * NULL if there was no label to fetch, or an error code.
262 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
267 struct smack_known
*skp
= NULL
;
269 if (!(ip
->i_opflags
& IOP_XATTR
))
270 return ERR_PTR(-EOPNOTSUPP
);
272 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
274 return ERR_PTR(-ENOMEM
);
276 rc
= __vfs_getxattr(dp
, ip
, name
, buffer
, SMK_LONGLABEL
);
282 skp
= smk_import_entry(buffer
, rc
);
290 * new_inode_smack - allocate an inode security blob
291 * @skp: a pointer to the Smack label entry to use in the blob
293 * Returns the new blob or NULL if there's no memory available
295 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
297 struct inode_smack
*isp
;
299 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
303 isp
->smk_inode
= skp
;
305 mutex_init(&isp
->smk_lock
);
311 * new_task_smack - allocate a task security blob
312 * @task: a pointer to the Smack label for the running task
313 * @forked: a pointer to the Smack label for the forked task
314 * @gfp: type of the memory for the allocation
316 * Returns the new blob or NULL if there's no memory available
318 static struct task_smack
*new_task_smack(struct smack_known
*task
,
319 struct smack_known
*forked
, gfp_t gfp
)
321 struct task_smack
*tsp
;
323 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
327 tsp
->smk_task
= task
;
328 tsp
->smk_forked
= forked
;
329 INIT_LIST_HEAD(&tsp
->smk_rules
);
330 INIT_LIST_HEAD(&tsp
->smk_relabel
);
331 mutex_init(&tsp
->smk_rules_lock
);
337 * smk_copy_rules - copy a rule set
338 * @nhead: new rules header pointer
339 * @ohead: old rules header pointer
340 * @gfp: type of the memory for the allocation
342 * Returns 0 on success, -ENOMEM on error
344 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
347 struct smack_rule
*nrp
;
348 struct smack_rule
*orp
;
351 list_for_each_entry_rcu(orp
, ohead
, list
) {
352 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
358 list_add_rcu(&nrp
->list
, nhead
);
364 * smk_copy_relabel - copy smk_relabel labels list
365 * @nhead: new rules header pointer
366 * @ohead: old rules header pointer
367 * @gfp: type of the memory for the allocation
369 * Returns 0 on success, -ENOMEM on error
371 static int smk_copy_relabel(struct list_head
*nhead
, struct list_head
*ohead
,
374 struct smack_known_list_elem
*nklep
;
375 struct smack_known_list_elem
*oklep
;
377 list_for_each_entry(oklep
, ohead
, list
) {
378 nklep
= kzalloc(sizeof(struct smack_known_list_elem
), gfp
);
380 smk_destroy_label_list(nhead
);
383 nklep
->smk_label
= oklep
->smk_label
;
384 list_add(&nklep
->list
, nhead
);
391 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392 * @mode - input mode in form of PTRACE_MODE_*
394 * Returns a converted MAY_* mode usable by smack rules
396 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
398 if (mode
& PTRACE_MODE_ATTACH
)
399 return MAY_READWRITE
;
400 if (mode
& PTRACE_MODE_READ
)
407 * smk_ptrace_rule_check - helper for ptrace access
408 * @tracer: tracer process
409 * @tracee_known: label entry of the process that's about to be traced
410 * @mode: ptrace attachment mode (PTRACE_MODE_*)
411 * @func: name of the function that called us, used for audit
413 * Returns 0 on access granted, -error on error
415 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
416 struct smack_known
*tracee_known
,
417 unsigned int mode
, const char *func
)
420 struct smk_audit_info ad
, *saip
= NULL
;
421 struct task_smack
*tsp
;
422 struct smack_known
*tracer_known
;
424 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
425 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
426 smk_ad_setfield_u_tsk(&ad
, tracer
);
431 tsp
= __task_cred(tracer
)->security
;
432 tracer_known
= smk_of_task(tsp
);
434 if ((mode
& PTRACE_MODE_ATTACH
) &&
435 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
436 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
437 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
439 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
441 else if (capable(CAP_SYS_PTRACE
))
447 smack_log(tracer_known
->smk_known
,
448 tracee_known
->smk_known
,
455 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
456 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
464 * We he, that is fun!
468 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
469 * @ctp: child task pointer
470 * @mode: ptrace attachment mode (PTRACE_MODE_*)
472 * Returns 0 if access is OK, an error code otherwise
474 * Do the capability checks.
476 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
478 struct smack_known
*skp
;
480 skp
= smk_of_task_struct(ctp
);
482 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
486 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487 * @ptp: parent task pointer
489 * Returns 0 if access is OK, an error code otherwise
491 * Do the capability checks, and require PTRACE_MODE_ATTACH.
493 static int smack_ptrace_traceme(struct task_struct
*ptp
)
496 struct smack_known
*skp
;
498 skp
= smk_of_task(current_security());
500 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
505 * smack_syslog - Smack approval on syslog
506 * @type: message type
508 * Returns 0 on success, error code otherwise.
510 static int smack_syslog(int typefrom_file
)
513 struct smack_known
*skp
= smk_of_current();
515 if (smack_privileged(CAP_MAC_OVERRIDE
))
518 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
530 * smack_sb_alloc_security - allocate a superblock blob
531 * @sb: the superblock getting the blob
533 * Returns 0 on success or -ENOMEM on error.
535 static int smack_sb_alloc_security(struct super_block
*sb
)
537 struct superblock_smack
*sbsp
;
539 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
544 sbsp
->smk_root
= &smack_known_floor
;
545 sbsp
->smk_default
= &smack_known_floor
;
546 sbsp
->smk_floor
= &smack_known_floor
;
547 sbsp
->smk_hat
= &smack_known_hat
;
549 * SMK_SB_INITIALIZED will be zero from kzalloc.
551 sb
->s_security
= sbsp
;
557 * smack_sb_free_security - free a superblock blob
558 * @sb: the superblock getting the blob
561 static void smack_sb_free_security(struct super_block
*sb
)
563 kfree(sb
->s_security
);
564 sb
->s_security
= NULL
;
568 * smack_sb_copy_data - copy mount options data for processing
569 * @orig: where to start
570 * @smackopts: mount options string
572 * Returns 0 on success or -ENOMEM on error.
574 * Copy the Smack specific mount options out of the mount
577 static int smack_sb_copy_data(char *orig
, char *smackopts
)
579 char *cp
, *commap
, *otheropts
, *dp
;
581 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
582 if (otheropts
== NULL
)
585 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
586 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
588 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
590 else if (strstr(cp
, SMK_FSHAT
) == cp
)
592 else if (strstr(cp
, SMK_FSROOT
) == cp
)
594 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
599 commap
= strchr(cp
, ',');
608 strcpy(orig
, otheropts
);
609 free_page((unsigned long)otheropts
);
615 * smack_parse_opts_str - parse Smack specific mount options
616 * @options: mount options string
617 * @opts: where to store converted mount opts
619 * Returns 0 on success or -ENOMEM on error.
621 * converts Smack specific mount options to generic security option format
623 static int smack_parse_opts_str(char *options
,
624 struct security_mnt_opts
*opts
)
627 char *fsdefault
= NULL
;
628 char *fsfloor
= NULL
;
631 char *fstransmute
= NULL
;
633 int num_mnt_opts
= 0;
636 opts
->num_mnt_opts
= 0;
641 while ((p
= strsep(&options
, ",")) != NULL
) {
642 substring_t args
[MAX_OPT_ARGS
];
647 token
= match_token(p
, smk_mount_tokens
, args
);
653 fsdefault
= match_strdup(&args
[0]);
660 fsfloor
= match_strdup(&args
[0]);
667 fshat
= match_strdup(&args
[0]);
674 fsroot
= match_strdup(&args
[0]);
678 case Opt_fstransmute
:
681 fstransmute
= match_strdup(&args
[0]);
687 pr_warn("Smack: unknown mount option\n");
692 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_KERNEL
);
696 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
698 if (!opts
->mnt_opts_flags
)
702 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
703 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
706 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
707 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
710 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
711 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
714 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
715 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
718 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
719 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
722 opts
->num_mnt_opts
= num_mnt_opts
;
727 pr_warn("Smack: duplicate mount options\n");
739 * smack_set_mnt_opts - set Smack specific mount options
740 * @sb: the file system superblock
741 * @opts: Smack mount options
742 * @kern_flags: mount option from kernel space or user space
743 * @set_kern_flags: where to store converted mount opts
745 * Returns 0 on success, an error code on failure
747 * Allow filesystems with binary mount data to explicitly set Smack mount
750 static int smack_set_mnt_opts(struct super_block
*sb
,
751 struct security_mnt_opts
*opts
,
752 unsigned long kern_flags
,
753 unsigned long *set_kern_flags
)
755 struct dentry
*root
= sb
->s_root
;
756 struct inode
*inode
= d_backing_inode(root
);
757 struct superblock_smack
*sp
= sb
->s_security
;
758 struct inode_smack
*isp
;
759 struct smack_known
*skp
;
761 int num_opts
= opts
->num_mnt_opts
;
764 if (sp
->smk_flags
& SMK_SB_INITIALIZED
)
767 if (!smack_privileged(CAP_MAC_ADMIN
)) {
769 * Unprivileged mounts don't get to specify Smack values.
774 * Unprivileged mounts get root and default from the caller.
776 skp
= smk_of_current();
778 sp
->smk_default
= skp
;
780 * For a handful of fs types with no user-controlled
781 * backing store it's okay to trust security labels
782 * in the filesystem. The rest are untrusted.
784 if (sb
->s_user_ns
!= &init_user_ns
&&
785 sb
->s_magic
!= SYSFS_MAGIC
&& sb
->s_magic
!= TMPFS_MAGIC
&&
786 sb
->s_magic
!= RAMFS_MAGIC
) {
788 sp
->smk_flags
|= SMK_SB_UNTRUSTED
;
792 sp
->smk_flags
|= SMK_SB_INITIALIZED
;
794 for (i
= 0; i
< num_opts
; i
++) {
795 switch (opts
->mnt_opts_flags
[i
]) {
797 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
800 sp
->smk_default
= skp
;
803 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
809 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
815 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
821 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
833 * Initialize the root inode.
835 isp
= inode
->i_security
;
837 isp
= new_inode_smack(sp
->smk_root
);
840 inode
->i_security
= isp
;
842 isp
->smk_inode
= sp
->smk_root
;
845 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
851 * smack_sb_kern_mount - Smack specific mount processing
852 * @sb: the file system superblock
853 * @flags: the mount flags
854 * @data: the smack mount options
856 * Returns 0 on success, an error code on failure
858 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
861 char *options
= data
;
862 struct security_mnt_opts opts
;
864 security_init_mnt_opts(&opts
);
869 rc
= smack_parse_opts_str(options
, &opts
);
874 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
877 security_free_mnt_opts(&opts
);
882 * smack_sb_statfs - Smack check on statfs
883 * @dentry: identifies the file system in question
885 * Returns 0 if current can read the floor of the filesystem,
886 * and error code otherwise
888 static int smack_sb_statfs(struct dentry
*dentry
)
890 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
892 struct smk_audit_info ad
;
894 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
895 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
897 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
898 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
907 * smack_bprm_set_creds - set creds for exec
908 * @bprm: the exec information
910 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
912 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
914 struct inode
*inode
= file_inode(bprm
->file
);
915 struct task_smack
*bsp
= bprm
->cred
->security
;
916 struct inode_smack
*isp
;
917 struct superblock_smack
*sbsp
;
920 if (bprm
->called_set_creds
)
923 isp
= inode
->i_security
;
924 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
927 sbsp
= inode
->i_sb
->s_security
;
928 if ((sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) &&
929 isp
->smk_task
!= sbsp
->smk_root
)
932 if (bprm
->unsafe
& LSM_UNSAFE_PTRACE
) {
933 struct task_struct
*tracer
;
937 tracer
= ptrace_parent(current
);
938 if (likely(tracer
!= NULL
))
939 rc
= smk_ptrace_rule_check(tracer
,
947 } else if (bprm
->unsafe
)
950 bsp
->smk_task
= isp
->smk_task
;
951 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
957 * smack_bprm_committing_creds - Prepare to install the new credentials
960 * @bprm: binprm for exec
962 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
964 struct task_smack
*bsp
= bprm
->cred
->security
;
966 if (bsp
->smk_task
!= bsp
->smk_forked
)
967 current
->pdeath_signal
= 0;
971 * smack_bprm_secureexec - Return the decision to use secureexec.
972 * @bprm: binprm for exec
974 * Returns 0 on success.
976 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
978 struct task_smack
*tsp
= current_security();
980 if (tsp
->smk_task
!= tsp
->smk_forked
)
991 * smack_inode_alloc_security - allocate an inode blob
992 * @inode: the inode in need of a blob
994 * Returns 0 if it gets a blob, -ENOMEM otherwise
996 static int smack_inode_alloc_security(struct inode
*inode
)
998 struct smack_known
*skp
= smk_of_current();
1000 inode
->i_security
= new_inode_smack(skp
);
1001 if (inode
->i_security
== NULL
)
1007 * smack_inode_free_rcu - Free inode_smack blob from cache
1008 * @head: the rcu_head for getting inode_smack pointer
1010 * Call back function called from call_rcu() to free
1011 * the i_security blob pointer in inode
1013 static void smack_inode_free_rcu(struct rcu_head
*head
)
1015 struct inode_smack
*issp
;
1017 issp
= container_of(head
, struct inode_smack
, smk_rcu
);
1018 kmem_cache_free(smack_inode_cache
, issp
);
1022 * smack_inode_free_security - free an inode blob using call_rcu()
1023 * @inode: the inode with a blob
1025 * Clears the blob pointer in inode using RCU
1027 static void smack_inode_free_security(struct inode
*inode
)
1029 struct inode_smack
*issp
= inode
->i_security
;
1032 * The inode may still be referenced in a path walk and
1033 * a call to smack_inode_permission() can be made
1034 * after smack_inode_free_security() is called.
1035 * To avoid race condition free the i_security via RCU
1036 * and leave the current inode->i_security pointer intact.
1037 * The inode will be freed after the RCU grace period too.
1039 call_rcu(&issp
->smk_rcu
, smack_inode_free_rcu
);
1043 * smack_inode_init_security - copy out the smack from an inode
1044 * @inode: the newly created inode
1045 * @dir: containing directory object
1047 * @name: where to put the attribute name
1048 * @value: where to put the attribute value
1049 * @len: where to put the length of the attribute
1051 * Returns 0 if it all works out, -ENOMEM if there's no memory
1053 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1054 const struct qstr
*qstr
, const char **name
,
1055 void **value
, size_t *len
)
1057 struct inode_smack
*issp
= inode
->i_security
;
1058 struct smack_known
*skp
= smk_of_current();
1059 struct smack_known
*isp
= smk_of_inode(inode
);
1060 struct smack_known
*dsp
= smk_of_inode(dir
);
1064 *name
= XATTR_SMACK_SUFFIX
;
1068 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1073 * If the access rule allows transmutation and
1074 * the directory requests transmutation then
1075 * by all means transmute.
1076 * Mark the inode as changed.
1078 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1079 smk_inode_transmutable(dir
)) {
1081 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1084 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1088 *len
= strlen(isp
->smk_known
);
1095 * smack_inode_link - Smack check on link
1096 * @old_dentry: the existing object
1098 * @new_dentry: the new object
1100 * Returns 0 if access is permitted, an error code otherwise
1102 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1103 struct dentry
*new_dentry
)
1105 struct smack_known
*isp
;
1106 struct smk_audit_info ad
;
1109 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1110 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1112 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1113 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1114 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1116 if (rc
== 0 && d_is_positive(new_dentry
)) {
1117 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1118 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1119 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1120 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1127 * smack_inode_unlink - Smack check on inode deletion
1128 * @dir: containing directory object
1129 * @dentry: file to unlink
1131 * Returns 0 if current can write the containing directory
1132 * and the object, error code otherwise
1134 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1136 struct inode
*ip
= d_backing_inode(dentry
);
1137 struct smk_audit_info ad
;
1140 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1141 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1144 * You need write access to the thing you're unlinking
1146 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1147 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1150 * You also need write access to the containing directory
1152 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1153 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1154 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1155 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1161 * smack_inode_rmdir - Smack check on directory deletion
1162 * @dir: containing directory object
1163 * @dentry: directory to unlink
1165 * Returns 0 if current can write the containing directory
1166 * and the directory, error code otherwise
1168 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1170 struct smk_audit_info ad
;
1173 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1174 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1177 * You need write access to the thing you're removing
1179 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1180 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1183 * You also need write access to the containing directory
1185 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1186 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1187 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1188 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1195 * smack_inode_rename - Smack check on rename
1196 * @old_inode: unused
1197 * @old_dentry: the old object
1198 * @new_inode: unused
1199 * @new_dentry: the new object
1201 * Read and write access is required on both the old and
1204 * Returns 0 if access is permitted, an error code otherwise
1206 static int smack_inode_rename(struct inode
*old_inode
,
1207 struct dentry
*old_dentry
,
1208 struct inode
*new_inode
,
1209 struct dentry
*new_dentry
)
1212 struct smack_known
*isp
;
1213 struct smk_audit_info ad
;
1215 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1216 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1218 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1219 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1220 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1222 if (rc
== 0 && d_is_positive(new_dentry
)) {
1223 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1224 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1225 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1226 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1232 * smack_inode_permission - Smack version of permission()
1233 * @inode: the inode in question
1234 * @mask: the access requested
1236 * This is the important Smack hook.
1238 * Returns 0 if access is permitted, -EACCES otherwise
1240 static int smack_inode_permission(struct inode
*inode
, int mask
)
1242 struct superblock_smack
*sbsp
= inode
->i_sb
->s_security
;
1243 struct smk_audit_info ad
;
1244 int no_block
= mask
& MAY_NOT_BLOCK
;
1247 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1249 * No permission to check. Existence test. Yup, it's there.
1254 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) {
1255 if (smk_of_inode(inode
) != sbsp
->smk_root
)
1259 /* May be droppable after audit */
1262 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1263 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1264 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1265 rc
= smk_bu_inode(inode
, mask
, rc
);
1270 * smack_inode_setattr - Smack check for setting attributes
1271 * @dentry: the object
1272 * @iattr: for the force flag
1274 * Returns 0 if access is permitted, an error code otherwise
1276 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1278 struct smk_audit_info ad
;
1282 * Need to allow for clearing the setuid bit.
1284 if (iattr
->ia_valid
& ATTR_FORCE
)
1286 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1287 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1289 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1290 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1295 * smack_inode_getattr - Smack check for getting attributes
1296 * @mnt: vfsmount of the object
1297 * @dentry: the object
1299 * Returns 0 if access is permitted, an error code otherwise
1301 static int smack_inode_getattr(const struct path
*path
)
1303 struct smk_audit_info ad
;
1304 struct inode
*inode
= d_backing_inode(path
->dentry
);
1307 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1308 smk_ad_setfield_u_fs_path(&ad
, *path
);
1309 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1310 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1315 * smack_inode_setxattr - Smack check for setting xattrs
1316 * @dentry: the object
1317 * @name: name of the attribute
1318 * @value: value of the attribute
1319 * @size: size of the value
1322 * This protects the Smack attribute explicitly.
1324 * Returns 0 if access is permitted, an error code otherwise
1326 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1327 const void *value
, size_t size
, int flags
)
1329 struct smk_audit_info ad
;
1330 struct smack_known
*skp
;
1332 int check_import
= 0;
1337 * Check label validity here so import won't fail in post_setxattr
1339 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1340 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1341 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1344 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1345 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1349 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1351 if (size
!= TRANS_TRUE_SIZE
||
1352 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1355 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1357 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1360 if (rc
== 0 && check_import
) {
1361 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1364 else if (skp
== NULL
|| (check_star
&&
1365 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1369 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1370 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1373 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1374 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1381 * smack_inode_post_setxattr - Apply the Smack update approved above
1383 * @name: attribute name
1384 * @value: attribute value
1385 * @size: attribute size
1388 * Set the pointer in the inode blob to the entry found
1389 * in the master label list.
1391 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1392 const void *value
, size_t size
, int flags
)
1394 struct smack_known
*skp
;
1395 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1397 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1398 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1402 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1403 skp
= smk_import_entry(value
, size
);
1405 isp
->smk_inode
= skp
;
1406 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1407 skp
= smk_import_entry(value
, size
);
1409 isp
->smk_task
= skp
;
1410 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1411 skp
= smk_import_entry(value
, size
);
1413 isp
->smk_mmap
= skp
;
1420 * smack_inode_getxattr - Smack check on getxattr
1421 * @dentry: the object
1424 * Returns 0 if access is permitted, an error code otherwise
1426 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1428 struct smk_audit_info ad
;
1431 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1432 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1434 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1435 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1440 * smack_inode_removexattr - Smack check on removexattr
1441 * @dentry: the object
1442 * @name: name of the attribute
1444 * Removing the Smack attribute requires CAP_MAC_ADMIN
1446 * Returns 0 if access is permitted, an error code otherwise
1448 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1450 struct inode_smack
*isp
;
1451 struct smk_audit_info ad
;
1454 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1455 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1456 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1457 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1458 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1459 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1460 if (!smack_privileged(CAP_MAC_ADMIN
))
1463 rc
= cap_inode_removexattr(dentry
, name
);
1468 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1469 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1471 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1472 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1476 isp
= d_backing_inode(dentry
)->i_security
;
1478 * Don't do anything special for these.
1479 * XATTR_NAME_SMACKIPIN
1480 * XATTR_NAME_SMACKIPOUT
1482 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1483 struct super_block
*sbp
= dentry
->d_sb
;
1484 struct superblock_smack
*sbsp
= sbp
->s_security
;
1486 isp
->smk_inode
= sbsp
->smk_default
;
1487 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0)
1488 isp
->smk_task
= NULL
;
1489 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1490 isp
->smk_mmap
= NULL
;
1491 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1492 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1498 * smack_inode_getsecurity - get smack xattrs
1499 * @inode: the object
1500 * @name: attribute name
1501 * @buffer: where to put the result
1504 * Returns the size of the attribute or an error code
1506 static int smack_inode_getsecurity(struct inode
*inode
,
1507 const char *name
, void **buffer
,
1510 struct socket_smack
*ssp
;
1511 struct socket
*sock
;
1512 struct super_block
*sbp
;
1513 struct inode
*ip
= (struct inode
*)inode
;
1514 struct smack_known
*isp
;
1518 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1519 isp
= smk_of_inode(inode
);
1520 ilen
= strlen(isp
->smk_known
);
1521 *buffer
= isp
->smk_known
;
1526 * The rest of the Smack xattrs are only on sockets.
1529 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1532 sock
= SOCKET_I(ip
);
1533 if (sock
== NULL
|| sock
->sk
== NULL
)
1536 ssp
= sock
->sk
->sk_security
;
1538 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1540 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1545 ilen
= strlen(isp
->smk_known
);
1547 *buffer
= isp
->smk_known
;
1556 * smack_inode_listsecurity - list the Smack attributes
1557 * @inode: the object
1558 * @buffer: where they go
1559 * @buffer_size: size of buffer
1561 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1564 int len
= sizeof(XATTR_NAME_SMACK
);
1566 if (buffer
!= NULL
&& len
<= buffer_size
)
1567 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1573 * smack_inode_getsecid - Extract inode's security id
1574 * @inode: inode to extract the info from
1575 * @secid: where result will be saved
1577 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1579 struct inode_smack
*isp
= inode
->i_security
;
1581 *secid
= isp
->smk_inode
->smk_secid
;
1589 * There is no smack_file_permission hook
1591 * Should access checks be done on each read or write?
1592 * UNICOS and SELinux say yes.
1593 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1595 * I'll say no for now. Smack does not do the frequent
1596 * label changing that SELinux does.
1600 * smack_file_alloc_security - assign a file security blob
1603 * The security blob for a file is a pointer to the master
1604 * label list, so no allocation is done.
1606 * f_security is the owner security information. It
1607 * isn't used on file access checks, it's for send_sigio.
1611 static int smack_file_alloc_security(struct file
*file
)
1613 struct smack_known
*skp
= smk_of_current();
1615 file
->f_security
= skp
;
1620 * smack_file_free_security - clear a file security blob
1623 * The security blob for a file is a pointer to the master
1624 * label list, so no memory is freed.
1626 static void smack_file_free_security(struct file
*file
)
1628 file
->f_security
= NULL
;
1632 * smack_file_ioctl - Smack check on ioctls
1637 * Relies heavily on the correct use of the ioctl command conventions.
1639 * Returns 0 if allowed, error code otherwise
1641 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1645 struct smk_audit_info ad
;
1646 struct inode
*inode
= file_inode(file
);
1648 if (unlikely(IS_PRIVATE(inode
)))
1651 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1652 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1654 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1655 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1656 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1659 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1660 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1661 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1668 * smack_file_lock - Smack check on file locking
1672 * Returns 0 if current has lock access, error code otherwise
1674 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1676 struct smk_audit_info ad
;
1678 struct inode
*inode
= file_inode(file
);
1680 if (unlikely(IS_PRIVATE(inode
)))
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_LOCK
, &ad
);
1686 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1691 * smack_file_fcntl - Smack check on fcntl
1693 * @cmd: what action to check
1696 * Generally these operations are harmless.
1697 * File locking operations present an obvious mechanism
1698 * for passing information, so they require write access.
1700 * Returns 0 if current has access, error code otherwise
1702 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1705 struct smk_audit_info ad
;
1707 struct inode
*inode
= file_inode(file
);
1709 if (unlikely(IS_PRIVATE(inode
)))
1717 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1718 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1719 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1720 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1724 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1725 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1726 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1727 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1738 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1739 * if mapping anonymous memory.
1740 * @file contains the file structure for file to map (may be NULL).
1741 * @reqprot contains the protection requested by the application.
1742 * @prot contains the protection that will be applied by the kernel.
1743 * @flags contains the operational flags.
1744 * Return 0 if permission is granted.
1746 static int smack_mmap_file(struct file
*file
,
1747 unsigned long reqprot
, unsigned long prot
,
1748 unsigned long flags
)
1750 struct smack_known
*skp
;
1751 struct smack_known
*mkp
;
1752 struct smack_rule
*srp
;
1753 struct task_smack
*tsp
;
1754 struct smack_known
*okp
;
1755 struct inode_smack
*isp
;
1756 struct superblock_smack
*sbsp
;
1765 if (unlikely(IS_PRIVATE(file_inode(file
))))
1768 isp
= file_inode(file
)->i_security
;
1769 if (isp
->smk_mmap
== NULL
)
1771 sbsp
= file_inode(file
)->i_sb
->s_security
;
1772 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
&&
1773 isp
->smk_mmap
!= sbsp
->smk_root
)
1775 mkp
= isp
->smk_mmap
;
1777 tsp
= current_security();
1778 skp
= smk_of_current();
1783 * For each Smack rule associated with the subject
1784 * label verify that the SMACK64MMAP also has access
1785 * to that rule's object label.
1787 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1788 okp
= srp
->smk_object
;
1790 * Matching labels always allows access.
1792 if (mkp
->smk_known
== okp
->smk_known
)
1795 * If there is a matching local rule take
1796 * that into account as well.
1798 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1802 may
= srp
->smk_access
;
1804 may
&= srp
->smk_access
;
1806 * If may is zero the SMACK64MMAP subject can't
1807 * possibly have less access.
1813 * Fetch the global list entry.
1814 * If there isn't one a SMACK64MMAP subject
1815 * can't have as much access as current.
1817 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1819 if (mmay
== -ENOENT
) {
1824 * If there is a local entry it modifies the
1825 * potential access, too.
1827 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1829 if (tmay
!= -ENOENT
)
1833 * If there is any access available to current that is
1834 * not available to a SMACK64MMAP subject
1837 if ((may
| mmay
) != mmay
) {
1849 * smack_file_set_fowner - set the file security blob value
1850 * @file: object in question
1853 static void smack_file_set_fowner(struct file
*file
)
1855 file
->f_security
= smk_of_current();
1859 * smack_file_send_sigiotask - Smack on sigio
1860 * @tsk: The target task
1861 * @fown: the object the signal come from
1864 * Allow a privileged task to get signals even if it shouldn't
1866 * Returns 0 if a subject with the object's smack could
1867 * write to the task, an error code otherwise.
1869 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1870 struct fown_struct
*fown
, int signum
)
1872 struct smack_known
*skp
;
1873 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1876 struct smk_audit_info ad
;
1879 * struct fown_struct is never outside the context of a struct file
1881 file
= container_of(fown
, struct file
, f_owner
);
1883 /* we don't log here as rc can be overriden */
1884 skp
= file
->f_security
;
1885 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, NULL
);
1886 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_DELIVER
, rc
);
1887 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1890 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1891 smk_ad_setfield_u_tsk(&ad
, tsk
);
1892 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_DELIVER
, rc
, &ad
);
1897 * smack_file_receive - Smack file receive check
1900 * Returns 0 if current has access, error code otherwise
1902 static int smack_file_receive(struct file
*file
)
1906 struct smk_audit_info ad
;
1907 struct inode
*inode
= file_inode(file
);
1908 struct socket
*sock
;
1909 struct task_smack
*tsp
;
1910 struct socket_smack
*ssp
;
1912 if (unlikely(IS_PRIVATE(inode
)))
1915 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1916 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1918 if (inode
->i_sb
->s_magic
== SOCKFS_MAGIC
) {
1919 sock
= SOCKET_I(inode
);
1920 ssp
= sock
->sk
->sk_security
;
1921 tsp
= current_security();
1923 * If the receiving process can't write to the
1924 * passed socket or if the passed socket can't
1925 * write to the receiving process don't accept
1926 * the passed socket.
1928 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1929 rc
= smk_bu_file(file
, may
, rc
);
1932 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1933 rc
= smk_bu_file(file
, may
, rc
);
1937 * This code relies on bitmasks.
1939 if (file
->f_mode
& FMODE_READ
)
1941 if (file
->f_mode
& FMODE_WRITE
)
1944 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1945 rc
= smk_bu_file(file
, may
, rc
);
1950 * smack_file_open - Smack dentry open processing
1952 * @cred: task credential
1954 * Set the security blob in the file structure.
1955 * Allow the open only if the task has read access. There are
1956 * many read operations (e.g. fstat) that you can do with an
1957 * fd even if you have the file open write-only.
1961 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1963 struct task_smack
*tsp
= cred
->security
;
1964 struct inode
*inode
= file_inode(file
);
1965 struct smk_audit_info ad
;
1968 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1969 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1970 rc
= smk_tskacc(tsp
, smk_of_inode(inode
), MAY_READ
, &ad
);
1971 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1981 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1982 * @new: the new credentials
1983 * @gfp: the atomicity of any memory allocations
1985 * Prepare a blank set of credentials for modification. This must allocate all
1986 * the memory the LSM module might require such that cred_transfer() can
1987 * complete without error.
1989 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1991 struct task_smack
*tsp
;
1993 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1997 cred
->security
= tsp
;
2004 * smack_cred_free - "free" task-level security credentials
2005 * @cred: the credentials in question
2008 static void smack_cred_free(struct cred
*cred
)
2010 struct task_smack
*tsp
= cred
->security
;
2011 struct smack_rule
*rp
;
2012 struct list_head
*l
;
2013 struct list_head
*n
;
2017 cred
->security
= NULL
;
2019 smk_destroy_label_list(&tsp
->smk_relabel
);
2021 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
2022 rp
= list_entry(l
, struct smack_rule
, list
);
2023 list_del(&rp
->list
);
2030 * smack_cred_prepare - prepare new set of credentials for modification
2031 * @new: the new credentials
2032 * @old: the original credentials
2033 * @gfp: the atomicity of any memory allocations
2035 * Prepare a new set of credentials for modification.
2037 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
2040 struct task_smack
*old_tsp
= old
->security
;
2041 struct task_smack
*new_tsp
;
2044 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
2045 if (new_tsp
== NULL
)
2048 new->security
= new_tsp
;
2050 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
2054 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
2063 * smack_cred_transfer - Transfer the old credentials to the new credentials
2064 * @new: the new credentials
2065 * @old: the original credentials
2067 * Fill in a set of blank credentials from another set of credentials.
2069 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2071 struct task_smack
*old_tsp
= old
->security
;
2072 struct task_smack
*new_tsp
= new->security
;
2074 new_tsp
->smk_task
= old_tsp
->smk_task
;
2075 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2076 mutex_init(&new_tsp
->smk_rules_lock
);
2077 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2080 /* cbs copy rule list */
2084 * smack_kernel_act_as - Set the subjective context in a set of credentials
2085 * @new: points to the set of credentials to be modified.
2086 * @secid: specifies the security ID to be set
2088 * Set the security data for a kernel service.
2090 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2092 struct task_smack
*new_tsp
= new->security
;
2094 new_tsp
->smk_task
= smack_from_secid(secid
);
2099 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2100 * @new: points to the set of credentials to be modified
2101 * @inode: points to the inode to use as a reference
2103 * Set the file creation context in a set of credentials to the same
2104 * as the objective context of the specified inode
2106 static int smack_kernel_create_files_as(struct cred
*new,
2107 struct inode
*inode
)
2109 struct inode_smack
*isp
= inode
->i_security
;
2110 struct task_smack
*tsp
= new->security
;
2112 tsp
->smk_forked
= isp
->smk_inode
;
2113 tsp
->smk_task
= tsp
->smk_forked
;
2118 * smk_curacc_on_task - helper to log task related access
2119 * @p: the task object
2120 * @access: the access requested
2121 * @caller: name of the calling function for audit
2123 * Return 0 if access is permitted
2125 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2128 struct smk_audit_info ad
;
2129 struct smack_known
*skp
= smk_of_task_struct(p
);
2132 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2133 smk_ad_setfield_u_tsk(&ad
, p
);
2134 rc
= smk_curacc(skp
, access
, &ad
);
2135 rc
= smk_bu_task(p
, access
, rc
);
2140 * smack_task_setpgid - Smack check on setting pgid
2141 * @p: the task object
2144 * Return 0 if write access is permitted
2146 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2148 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2152 * smack_task_getpgid - Smack access check for getpgid
2153 * @p: the object task
2155 * Returns 0 if current can read the object task, error code otherwise
2157 static int smack_task_getpgid(struct task_struct
*p
)
2159 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2163 * smack_task_getsid - Smack access check for getsid
2164 * @p: the object task
2166 * Returns 0 if current can read the object task, error code otherwise
2168 static int smack_task_getsid(struct task_struct
*p
)
2170 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2174 * smack_task_getsecid - get the secid of the task
2175 * @p: the object task
2176 * @secid: where to put the result
2178 * Sets the secid to contain a u32 version of the smack label.
2180 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2182 struct smack_known
*skp
= smk_of_task_struct(p
);
2184 *secid
= skp
->smk_secid
;
2188 * smack_task_setnice - Smack check on setting nice
2189 * @p: the task object
2192 * Return 0 if write access is permitted
2194 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2196 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2200 * smack_task_setioprio - Smack check on setting ioprio
2201 * @p: the task object
2204 * Return 0 if write access is permitted
2206 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2208 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2212 * smack_task_getioprio - Smack check on reading ioprio
2213 * @p: the task object
2215 * Return 0 if read access is permitted
2217 static int smack_task_getioprio(struct task_struct
*p
)
2219 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2223 * smack_task_setscheduler - Smack check on setting scheduler
2224 * @p: the task object
2228 * Return 0 if read access is permitted
2230 static int smack_task_setscheduler(struct task_struct
*p
)
2232 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2236 * smack_task_getscheduler - Smack check on reading scheduler
2237 * @p: the task object
2239 * Return 0 if read access is permitted
2241 static int smack_task_getscheduler(struct task_struct
*p
)
2243 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2247 * smack_task_movememory - Smack check on moving memory
2248 * @p: the task object
2250 * Return 0 if write access is permitted
2252 static int smack_task_movememory(struct task_struct
*p
)
2254 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2258 * smack_task_kill - Smack check on signal delivery
2259 * @p: the task object
2262 * @secid: identifies the smack to use in lieu of current's
2264 * Return 0 if write access is permitted
2266 * The secid behavior is an artifact of an SELinux hack
2267 * in the USB code. Someday it may go away.
2269 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2272 struct smk_audit_info ad
;
2273 struct smack_known
*skp
;
2274 struct smack_known
*tkp
= smk_of_task_struct(p
);
2278 return 0; /* null signal; existence test */
2280 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2281 smk_ad_setfield_u_tsk(&ad
, p
);
2283 * Sending a signal requires that the sender
2284 * can write the receiver.
2287 rc
= smk_curacc(tkp
, MAY_DELIVER
, &ad
);
2288 rc
= smk_bu_task(p
, MAY_DELIVER
, rc
);
2292 * If the secid isn't 0 we're dealing with some USB IO
2293 * specific behavior. This is not clean. For one thing
2294 * we can't take privilege into account.
2296 skp
= smack_from_secid(secid
);
2297 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, &ad
);
2298 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_DELIVER
, rc
);
2303 * smack_task_to_inode - copy task smack into the inode blob
2304 * @p: task to copy from
2305 * @inode: inode to copy to
2307 * Sets the smack pointer in the inode security blob
2309 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2311 struct inode_smack
*isp
= inode
->i_security
;
2312 struct smack_known
*skp
= smk_of_task_struct(p
);
2314 isp
->smk_inode
= skp
;
2322 * smack_sk_alloc_security - Allocate a socket blob
2325 * @gfp_flags: memory allocation flags
2327 * Assign Smack pointers to current
2329 * Returns 0 on success, -ENOMEM is there's no memory
2331 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2333 struct smack_known
*skp
= smk_of_current();
2334 struct socket_smack
*ssp
;
2336 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2341 * Sockets created by kernel threads receive web label.
2343 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2344 ssp
->smk_in
= &smack_known_web
;
2345 ssp
->smk_out
= &smack_known_web
;
2350 ssp
->smk_packet
= NULL
;
2352 sk
->sk_security
= ssp
;
2358 * smack_sk_free_security - Free a socket blob
2361 * Clears the blob pointer
2363 static void smack_sk_free_security(struct sock
*sk
)
2365 #ifdef SMACK_IPV6_PORT_LABELING
2366 struct smk_port_label
*spp
;
2368 if (sk
->sk_family
== PF_INET6
) {
2370 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2371 if (spp
->smk_sock
!= sk
)
2373 spp
->smk_can_reuse
= 1;
2379 kfree(sk
->sk_security
);
2383 * smack_ipv4host_label - check host based restrictions
2384 * @sip: the object end
2386 * looks for host based access restrictions
2388 * This version will only be appropriate for really small sets of single label
2389 * hosts. The caller is responsible for ensuring that the RCU read lock is
2390 * taken before calling this function.
2392 * Returns the label of the far end or NULL if it's not special.
2394 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2396 struct smk_net4addr
*snp
;
2397 struct in_addr
*siap
= &sip
->sin_addr
;
2399 if (siap
->s_addr
== 0)
2402 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2404 * we break after finding the first match because
2405 * the list is sorted from longest to shortest mask
2406 * so we have found the most specific match
2408 if (snp
->smk_host
.s_addr
==
2409 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2410 return snp
->smk_label
;
2415 #if IS_ENABLED(CONFIG_IPV6)
2417 * smk_ipv6_localhost - Check for local ipv6 host address
2420 * Returns boolean true if this is the localhost address
2422 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2424 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2425 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2427 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2428 ntohs(be16p
[7]) == 1)
2434 * smack_ipv6host_label - check host based restrictions
2435 * @sip: the object end
2437 * looks for host based access restrictions
2439 * This version will only be appropriate for really small sets of single label
2440 * hosts. The caller is responsible for ensuring that the RCU read lock is
2441 * taken before calling this function.
2443 * Returns the label of the far end or NULL if it's not special.
2445 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2447 struct smk_net6addr
*snp
;
2448 struct in6_addr
*sap
= &sip
->sin6_addr
;
2453 * It's local. Don't look for a host label.
2455 if (smk_ipv6_localhost(sip
))
2458 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2460 * If the label is NULL the entry has
2461 * been renounced. Ignore it.
2463 if (snp
->smk_label
== NULL
)
2466 * we break after finding the first match because
2467 * the list is sorted from longest to shortest mask
2468 * so we have found the most specific match
2470 for (found
= 1, i
= 0; i
< 8; i
++) {
2471 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2472 snp
->smk_host
.s6_addr16
[i
]) {
2478 return snp
->smk_label
;
2483 #endif /* CONFIG_IPV6 */
2486 * smack_netlabel - Set the secattr on a socket
2488 * @labeled: socket label scheme
2490 * Convert the outbound smack value (smk_out) to a
2491 * secattr and attach it to the socket.
2493 * Returns 0 on success or an error code
2495 static int smack_netlabel(struct sock
*sk
, int labeled
)
2497 struct smack_known
*skp
;
2498 struct socket_smack
*ssp
= sk
->sk_security
;
2502 * Usually the netlabel code will handle changing the
2503 * packet labeling based on the label.
2504 * The case of a single label host is different, because
2505 * a single label host should never get a labeled packet
2506 * even though the label is usually associated with a packet
2510 bh_lock_sock_nested(sk
);
2512 if (ssp
->smk_out
== smack_net_ambient
||
2513 labeled
== SMACK_UNLABELED_SOCKET
)
2514 netlbl_sock_delattr(sk
);
2517 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2527 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2529 * @sap: the destination address
2531 * Set the correct secattr for the given socket based on the destination
2532 * address and perform any outbound access checks needed.
2534 * Returns 0 on success or an error code.
2537 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2539 struct smack_known
*skp
;
2542 struct smack_known
*hkp
;
2543 struct socket_smack
*ssp
= sk
->sk_security
;
2544 struct smk_audit_info ad
;
2547 hkp
= smack_ipv4host_label(sap
);
2550 struct lsm_network_audit net
;
2552 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2553 ad
.a
.u
.net
->family
= sap
->sin_family
;
2554 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2555 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2557 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2559 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2560 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2562 sk_lbl
= SMACK_CIPSO_SOCKET
;
2569 return smack_netlabel(sk
, sk_lbl
);
2572 #if IS_ENABLED(CONFIG_IPV6)
2574 * smk_ipv6_check - check Smack access
2575 * @subject: subject Smack label
2576 * @object: object Smack label
2578 * @act: the action being taken
2580 * Check an IPv6 access
2582 static int smk_ipv6_check(struct smack_known
*subject
,
2583 struct smack_known
*object
,
2584 struct sockaddr_in6
*address
, int act
)
2587 struct lsm_network_audit net
;
2589 struct smk_audit_info ad
;
2593 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2594 ad
.a
.u
.net
->family
= PF_INET6
;
2595 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2596 if (act
== SMK_RECEIVING
)
2597 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2599 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2601 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2602 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2605 #endif /* CONFIG_IPV6 */
2607 #ifdef SMACK_IPV6_PORT_LABELING
2609 * smk_ipv6_port_label - Smack port access table management
2613 * Create or update the port list entry
2615 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2617 struct sock
*sk
= sock
->sk
;
2618 struct sockaddr_in6
*addr6
;
2619 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2620 struct smk_port_label
*spp
;
2621 unsigned short port
= 0;
2623 if (address
== NULL
) {
2625 * This operation is changing the Smack information
2626 * on the bound socket. Take the changes to the port
2630 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2631 if (sk
!= spp
->smk_sock
)
2633 spp
->smk_in
= ssp
->smk_in
;
2634 spp
->smk_out
= ssp
->smk_out
;
2639 * A NULL address is only used for updating existing
2640 * bound entries. If there isn't one, it's OK.
2646 addr6
= (struct sockaddr_in6
*)address
;
2647 port
= ntohs(addr6
->sin6_port
);
2649 * This is a special case that is safely ignored.
2655 * Look for an existing port list entry.
2656 * This is an indication that a port is getting reused.
2659 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2660 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sock
->type
)
2662 if (spp
->smk_can_reuse
!= 1) {
2666 spp
->smk_port
= port
;
2668 spp
->smk_in
= ssp
->smk_in
;
2669 spp
->smk_out
= ssp
->smk_out
;
2670 spp
->smk_can_reuse
= 0;
2676 * A new port entry is required.
2678 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2682 spp
->smk_port
= port
;
2684 spp
->smk_in
= ssp
->smk_in
;
2685 spp
->smk_out
= ssp
->smk_out
;
2686 spp
->smk_sock_type
= sock
->type
;
2687 spp
->smk_can_reuse
= 0;
2689 mutex_lock(&smack_ipv6_lock
);
2690 list_add_rcu(&spp
->list
, &smk_ipv6_port_list
);
2691 mutex_unlock(&smack_ipv6_lock
);
2696 * smk_ipv6_port_check - check Smack port access
2700 * Create or update the port list entry
2702 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2705 struct smk_port_label
*spp
;
2706 struct socket_smack
*ssp
= sk
->sk_security
;
2707 struct smack_known
*skp
= NULL
;
2708 unsigned short port
;
2709 struct smack_known
*object
;
2711 if (act
== SMK_RECEIVING
) {
2712 skp
= smack_ipv6host_label(address
);
2713 object
= ssp
->smk_in
;
2716 object
= smack_ipv6host_label(address
);
2720 * The other end is a single label host.
2722 if (skp
!= NULL
&& object
!= NULL
)
2723 return smk_ipv6_check(skp
, object
, address
, act
);
2725 skp
= smack_net_ambient
;
2727 object
= smack_net_ambient
;
2730 * It's remote, so port lookup does no good.
2732 if (!smk_ipv6_localhost(address
))
2733 return smk_ipv6_check(skp
, object
, address
, act
);
2736 * It's local so the send check has to have passed.
2738 if (act
== SMK_RECEIVING
)
2741 port
= ntohs(address
->sin6_port
);
2743 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2744 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sk
->sk_type
)
2746 object
= spp
->smk_in
;
2747 if (act
== SMK_CONNECTING
)
2748 ssp
->smk_packet
= spp
->smk_out
;
2753 return smk_ipv6_check(skp
, object
, address
, act
);
2755 #endif /* SMACK_IPV6_PORT_LABELING */
2758 * smack_inode_setsecurity - set smack xattrs
2759 * @inode: the object
2760 * @name: attribute name
2761 * @value: attribute value
2762 * @size: size of the attribute
2765 * Sets the named attribute in the appropriate blob
2767 * Returns 0 on success, or an error code
2769 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2770 const void *value
, size_t size
, int flags
)
2772 struct smack_known
*skp
;
2773 struct inode_smack
*nsp
= inode
->i_security
;
2774 struct socket_smack
*ssp
;
2775 struct socket
*sock
;
2778 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2781 skp
= smk_import_entry(value
, size
);
2783 return PTR_ERR(skp
);
2785 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2786 nsp
->smk_inode
= skp
;
2787 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2791 * The rest of the Smack xattrs are only on sockets.
2793 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2796 sock
= SOCKET_I(inode
);
2797 if (sock
== NULL
|| sock
->sk
== NULL
)
2800 ssp
= sock
->sk
->sk_security
;
2802 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2804 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2806 if (sock
->sk
->sk_family
== PF_INET
) {
2807 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2810 "Smack: \"%s\" netlbl error %d.\n",
2816 #ifdef SMACK_IPV6_PORT_LABELING
2817 if (sock
->sk
->sk_family
== PF_INET6
)
2818 smk_ipv6_port_label(sock
, NULL
);
2825 * smack_socket_post_create - finish socket setup
2827 * @family: protocol family
2832 * Sets the netlabel information on the socket
2834 * Returns 0 on success, and error code otherwise
2836 static int smack_socket_post_create(struct socket
*sock
, int family
,
2837 int type
, int protocol
, int kern
)
2839 struct socket_smack
*ssp
;
2841 if (sock
->sk
== NULL
)
2845 * Sockets created by kernel threads receive web label.
2847 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2848 ssp
= sock
->sk
->sk_security
;
2849 ssp
->smk_in
= &smack_known_web
;
2850 ssp
->smk_out
= &smack_known_web
;
2853 if (family
!= PF_INET
)
2856 * Set the outbound netlbl.
2858 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2861 #ifdef SMACK_IPV6_PORT_LABELING
2863 * smack_socket_bind - record port binding information.
2865 * @address: the port address
2866 * @addrlen: size of the address
2868 * Records the label bound to a port.
2872 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2875 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2876 smk_ipv6_port_label(sock
, address
);
2879 #endif /* SMACK_IPV6_PORT_LABELING */
2882 * smack_socket_connect - connect access check
2884 * @sap: the other end
2885 * @addrlen: size of sap
2887 * Verifies that a connection may be possible
2889 * Returns 0 on success, and error code otherwise
2891 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2895 #if IS_ENABLED(CONFIG_IPV6)
2896 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2898 #ifdef SMACK_IPV6_SECMARK_LABELING
2899 struct smack_known
*rsp
;
2900 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2903 if (sock
->sk
== NULL
)
2906 switch (sock
->sk
->sk_family
) {
2908 if (addrlen
< sizeof(struct sockaddr_in
))
2910 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2913 if (addrlen
< sizeof(struct sockaddr_in6
))
2915 #ifdef SMACK_IPV6_SECMARK_LABELING
2916 rsp
= smack_ipv6host_label(sip
);
2918 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2921 #ifdef SMACK_IPV6_PORT_LABELING
2922 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2930 * smack_flags_to_may - convert S_ to MAY_ values
2931 * @flags: the S_ value
2933 * Returns the equivalent MAY_ value
2935 static int smack_flags_to_may(int flags
)
2939 if (flags
& S_IRUGO
)
2941 if (flags
& S_IWUGO
)
2943 if (flags
& S_IXUGO
)
2950 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2955 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2957 struct smack_known
*skp
= smk_of_current();
2959 msg
->security
= skp
;
2964 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2967 * Clears the blob pointer
2969 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2971 msg
->security
= NULL
;
2975 * smack_of_shm - the smack pointer for the shm
2978 * Returns a pointer to the smack value
2980 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2982 return (struct smack_known
*)shp
->shm_perm
.security
;
2986 * smack_shm_alloc_security - Set the security blob for shm
2991 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2993 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2994 struct smack_known
*skp
= smk_of_current();
2996 isp
->security
= skp
;
3001 * smack_shm_free_security - Clear the security blob for shm
3004 * Clears the blob pointer
3006 static void smack_shm_free_security(struct shmid_kernel
*shp
)
3008 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
3010 isp
->security
= NULL
;
3014 * smk_curacc_shm : check if current has access on shm
3016 * @access : access requested
3018 * Returns 0 if current has the requested access, error code otherwise
3020 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
3022 struct smack_known
*ssp
= smack_of_shm(shp
);
3023 struct smk_audit_info ad
;
3027 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3028 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
3030 rc
= smk_curacc(ssp
, access
, &ad
);
3031 rc
= smk_bu_current("shm", ssp
, access
, rc
);
3036 * smack_shm_associate - Smack access check for shm
3038 * @shmflg: access requested
3040 * Returns 0 if current has the requested access, error code otherwise
3042 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
3046 may
= smack_flags_to_may(shmflg
);
3047 return smk_curacc_shm(shp
, may
);
3051 * smack_shm_shmctl - Smack access check for shm
3053 * @cmd: what it wants to do
3055 * Returns 0 if current has the requested access, error code otherwise
3057 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
3070 may
= MAY_READWRITE
;
3075 * System level information.
3081 return smk_curacc_shm(shp
, may
);
3085 * smack_shm_shmat - Smack access for shmat
3088 * @shmflg: access requested
3090 * Returns 0 if current has the requested access, error code otherwise
3092 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
3097 may
= smack_flags_to_may(shmflg
);
3098 return smk_curacc_shm(shp
, may
);
3102 * smack_of_sem - the smack pointer for the sem
3105 * Returns a pointer to the smack value
3107 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
3109 return (struct smack_known
*)sma
->sem_perm
.security
;
3113 * smack_sem_alloc_security - Set the security blob for sem
3118 static int smack_sem_alloc_security(struct sem_array
*sma
)
3120 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3121 struct smack_known
*skp
= smk_of_current();
3123 isp
->security
= skp
;
3128 * smack_sem_free_security - Clear the security blob for sem
3131 * Clears the blob pointer
3133 static void smack_sem_free_security(struct sem_array
*sma
)
3135 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3137 isp
->security
= NULL
;
3141 * smk_curacc_sem : check if current has access on sem
3143 * @access : access requested
3145 * Returns 0 if current has the requested access, error code otherwise
3147 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3149 struct smack_known
*ssp
= smack_of_sem(sma
);
3150 struct smk_audit_info ad
;
3154 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3155 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3157 rc
= smk_curacc(ssp
, access
, &ad
);
3158 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3163 * smack_sem_associate - Smack access check for sem
3165 * @semflg: access requested
3167 * Returns 0 if current has the requested access, error code otherwise
3169 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3173 may
= smack_flags_to_may(semflg
);
3174 return smk_curacc_sem(sma
, may
);
3178 * smack_sem_shmctl - Smack access check for sem
3180 * @cmd: what it wants to do
3182 * Returns 0 if current has the requested access, error code otherwise
3184 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3202 may
= MAY_READWRITE
;
3207 * System level information
3214 return smk_curacc_sem(sma
, may
);
3218 * smack_sem_semop - Smack checks of semaphore operations
3224 * Treated as read and write in all cases.
3226 * Returns 0 if access is allowed, error code otherwise
3228 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3229 unsigned nsops
, int alter
)
3231 return smk_curacc_sem(sma
, MAY_READWRITE
);
3235 * smack_msg_alloc_security - Set the security blob for msg
3240 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3242 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3243 struct smack_known
*skp
= smk_of_current();
3245 kisp
->security
= skp
;
3250 * smack_msg_free_security - Clear the security blob for msg
3253 * Clears the blob pointer
3255 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3257 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3259 kisp
->security
= NULL
;
3263 * smack_of_msq - the smack pointer for the msq
3266 * Returns a pointer to the smack label entry
3268 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3270 return (struct smack_known
*)msq
->q_perm
.security
;
3274 * smk_curacc_msq : helper to check if current has access on msq
3276 * @access : access requested
3278 * return 0 if current has access, error otherwise
3280 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3282 struct smack_known
*msp
= smack_of_msq(msq
);
3283 struct smk_audit_info ad
;
3287 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3288 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3290 rc
= smk_curacc(msp
, access
, &ad
);
3291 rc
= smk_bu_current("msq", msp
, access
, rc
);
3296 * smack_msg_queue_associate - Smack access check for msg_queue
3298 * @msqflg: access requested
3300 * Returns 0 if current has the requested access, error code otherwise
3302 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3306 may
= smack_flags_to_may(msqflg
);
3307 return smk_curacc_msq(msq
, may
);
3311 * smack_msg_queue_msgctl - Smack access check for msg_queue
3313 * @cmd: what it wants to do
3315 * Returns 0 if current has the requested access, error code otherwise
3317 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3328 may
= MAY_READWRITE
;
3333 * System level information
3340 return smk_curacc_msq(msq
, may
);
3344 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3347 * @msqflg: access requested
3349 * Returns 0 if current has the requested access, error code otherwise
3351 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3356 may
= smack_flags_to_may(msqflg
);
3357 return smk_curacc_msq(msq
, may
);
3361 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3368 * Returns 0 if current has read and write access, error code otherwise
3370 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3371 struct task_struct
*target
, long type
, int mode
)
3373 return smk_curacc_msq(msq
, MAY_READWRITE
);
3377 * smack_ipc_permission - Smack access for ipc_permission()
3378 * @ipp: the object permissions
3379 * @flag: access requested
3381 * Returns 0 if current has read and write access, error code otherwise
3383 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3385 struct smack_known
*iskp
= ipp
->security
;
3386 int may
= smack_flags_to_may(flag
);
3387 struct smk_audit_info ad
;
3391 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3392 ad
.a
.u
.ipc_id
= ipp
->id
;
3394 rc
= smk_curacc(iskp
, may
, &ad
);
3395 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3400 * smack_ipc_getsecid - Extract smack security id
3401 * @ipp: the object permissions
3402 * @secid: where result will be saved
3404 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3406 struct smack_known
*iskp
= ipp
->security
;
3408 *secid
= iskp
->smk_secid
;
3412 * smack_d_instantiate - Make sure the blob is correct on an inode
3413 * @opt_dentry: dentry where inode will be attached
3414 * @inode: the object
3416 * Set the inode's security blob if it hasn't been done already.
3418 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3420 struct super_block
*sbp
;
3421 struct superblock_smack
*sbsp
;
3422 struct inode_smack
*isp
;
3423 struct smack_known
*skp
;
3424 struct smack_known
*ckp
= smk_of_current();
3425 struct smack_known
*final
;
3426 char trattr
[TRANS_TRUE_SIZE
];
3434 isp
= inode
->i_security
;
3436 mutex_lock(&isp
->smk_lock
);
3438 * If the inode is already instantiated
3439 * take the quick way out
3441 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3445 sbsp
= sbp
->s_security
;
3447 * We're going to use the superblock default label
3448 * if there's no label on the file.
3450 final
= sbsp
->smk_default
;
3453 * If this is the root inode the superblock
3454 * may be in the process of initialization.
3455 * If that is the case use the root value out
3456 * of the superblock.
3458 if (opt_dentry
->d_parent
== opt_dentry
) {
3459 switch (sbp
->s_magic
) {
3460 case CGROUP_SUPER_MAGIC
:
3462 * The cgroup filesystem is never mounted,
3463 * so there's no opportunity to set the mount
3466 sbsp
->smk_root
= &smack_known_star
;
3467 sbsp
->smk_default
= &smack_known_star
;
3468 isp
->smk_inode
= sbsp
->smk_root
;
3472 * What about shmem/tmpfs anonymous files with dentry
3473 * obtained from d_alloc_pseudo()?
3475 isp
->smk_inode
= smk_of_current();
3478 isp
->smk_inode
= smk_of_current();
3482 * Socket access is controlled by the socket
3483 * structures associated with the task involved.
3485 isp
->smk_inode
= &smack_known_star
;
3488 isp
->smk_inode
= sbsp
->smk_root
;
3491 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3496 * This is pretty hackish.
3497 * Casey says that we shouldn't have to do
3498 * file system specific code, but it does help
3499 * with keeping it simple.
3501 switch (sbp
->s_magic
) {
3503 case CGROUP_SUPER_MAGIC
:
3505 * Casey says that it's a little embarrassing
3506 * that the smack file system doesn't do
3507 * extended attributes.
3509 * Cgroupfs is special
3511 final
= &smack_known_star
;
3513 case DEVPTS_SUPER_MAGIC
:
3515 * devpts seems content with the label of the task.
3516 * Programs that change smack have to treat the
3521 case PROC_SUPER_MAGIC
:
3523 * Casey says procfs appears not to care.
3524 * The superblock default suffices.
3529 * Device labels should come from the filesystem,
3530 * but watch out, because they're volitile,
3531 * getting recreated on every reboot.
3533 final
= &smack_known_star
;
3537 * If a smack value has been set we want to use it,
3538 * but since tmpfs isn't giving us the opportunity
3539 * to set mount options simulate setting the
3540 * superblock default.
3544 * This isn't an understood special case.
3545 * Get the value from the xattr.
3549 * UNIX domain sockets use lower level socket data.
3551 if (S_ISSOCK(inode
->i_mode
)) {
3552 final
= &smack_known_star
;
3556 * No xattr support means, alas, no SMACK label.
3557 * Use the aforeapplied default.
3558 * It would be curious if the label of the task
3559 * does not match that assigned.
3561 if (!(inode
->i_opflags
& IOP_XATTR
))
3564 * Get the dentry for xattr.
3566 dp
= dget(opt_dentry
);
3567 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3568 if (!IS_ERR_OR_NULL(skp
))
3572 * Transmuting directory
3574 if (S_ISDIR(inode
->i_mode
)) {
3576 * If this is a new directory and the label was
3577 * transmuted when the inode was initialized
3578 * set the transmute attribute on the directory
3579 * and mark the inode.
3581 * If there is a transmute attribute on the
3582 * directory mark the inode.
3584 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3585 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3586 rc
= __vfs_setxattr(dp
, inode
,
3587 XATTR_NAME_SMACKTRANSMUTE
,
3588 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3591 rc
= __vfs_getxattr(dp
, inode
,
3592 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3594 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3595 TRANS_TRUE_SIZE
) != 0)
3599 transflag
= SMK_INODE_TRANSMUTE
;
3602 * Don't let the exec or mmap label be "*" or "@".
3604 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3605 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3606 skp
== &smack_known_web
)
3608 isp
->smk_task
= skp
;
3610 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3611 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3612 skp
== &smack_known_web
)
3614 isp
->smk_mmap
= skp
;
3621 isp
->smk_inode
= ckp
;
3623 isp
->smk_inode
= final
;
3625 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3628 mutex_unlock(&isp
->smk_lock
);
3633 * smack_getprocattr - Smack process attribute access
3634 * @p: the object task
3635 * @name: the name of the attribute in /proc/.../attr
3636 * @value: where to put the result
3638 * Places a copy of the task Smack into value
3640 * Returns the length of the smack label or an error code
3642 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3644 struct smack_known
*skp
= smk_of_task_struct(p
);
3648 if (strcmp(name
, "current") != 0)
3651 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3661 * smack_setprocattr - Smack process attribute setting
3662 * @name: the name of the attribute in /proc/.../attr
3663 * @value: the value to set
3664 * @size: the size of the value
3666 * Sets the Smack value of the task. Only setting self
3667 * is permitted and only with privilege
3669 * Returns the length of the smack label or an error code
3671 static int smack_setprocattr(const char *name
, void *value
, size_t size
)
3673 struct task_smack
*tsp
= current_security();
3675 struct smack_known
*skp
;
3676 struct smack_known_list_elem
*sklep
;
3679 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3682 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3685 if (strcmp(name
, "current") != 0)
3688 skp
= smk_import_entry(value
, size
);
3690 return PTR_ERR(skp
);
3693 * No process is ever allowed the web ("@") label
3694 * and the star ("*") label.
3696 if (skp
== &smack_known_web
|| skp
== &smack_known_star
)
3699 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3701 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3702 if (sklep
->smk_label
== skp
) {
3710 new = prepare_creds();
3714 tsp
= new->security
;
3715 tsp
->smk_task
= skp
;
3717 * process can change its label only once
3719 smk_destroy_label_list(&tsp
->smk_relabel
);
3726 * smack_unix_stream_connect - Smack access on UDS
3728 * @other: the other sock
3731 * Return 0 if a subject with the smack of sock could access
3732 * an object with the smack of other, otherwise an error code
3734 static int smack_unix_stream_connect(struct sock
*sock
,
3735 struct sock
*other
, struct sock
*newsk
)
3737 struct smack_known
*skp
;
3738 struct smack_known
*okp
;
3739 struct socket_smack
*ssp
= sock
->sk_security
;
3740 struct socket_smack
*osp
= other
->sk_security
;
3741 struct socket_smack
*nsp
= newsk
->sk_security
;
3742 struct smk_audit_info ad
;
3745 struct lsm_network_audit net
;
3748 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3752 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3753 smk_ad_setfield_u_net_sk(&ad
, other
);
3755 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3756 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3760 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3761 rc
= smk_bu_note("UDS connect", okp
, skp
,
3767 * Cross reference the peer labels for SO_PEERSEC.
3770 nsp
->smk_packet
= ssp
->smk_out
;
3771 ssp
->smk_packet
= osp
->smk_out
;
3778 * smack_unix_may_send - Smack access on UDS
3780 * @other: the other socket
3782 * Return 0 if a subject with the smack of sock could access
3783 * an object with the smack of other, otherwise an error code
3785 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3787 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3788 struct socket_smack
*osp
= other
->sk
->sk_security
;
3789 struct smk_audit_info ad
;
3793 struct lsm_network_audit net
;
3795 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3796 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3799 if (smack_privileged(CAP_MAC_OVERRIDE
))
3802 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3803 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3808 * smack_socket_sendmsg - Smack check based on destination host
3811 * @size: the size of the message
3813 * Return 0 if the current subject can write to the destination host.
3814 * For IPv4 this is only a question if the destination is a single label host.
3815 * For IPv6 this is a check against the label of the port.
3817 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3820 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3821 #if IS_ENABLED(CONFIG_IPV6)
3822 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3824 #ifdef SMACK_IPV6_SECMARK_LABELING
3825 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3826 struct smack_known
*rsp
;
3831 * Perfectly reasonable for this to be NULL
3836 switch (sock
->sk
->sk_family
) {
3838 rc
= smack_netlabel_send(sock
->sk
, sip
);
3841 #ifdef SMACK_IPV6_SECMARK_LABELING
3842 rsp
= smack_ipv6host_label(sap
);
3844 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3847 #ifdef SMACK_IPV6_PORT_LABELING
3848 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3856 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3857 * @sap: netlabel secattr
3858 * @ssp: socket security information
3860 * Returns a pointer to a Smack label entry found on the label list.
3862 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3863 struct socket_smack
*ssp
)
3865 struct smack_known
*skp
;
3870 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3872 * Looks like a CIPSO packet.
3873 * If there are flags but no level netlabel isn't
3874 * behaving the way we expect it to.
3876 * Look it up in the label table
3877 * Without guidance regarding the smack value
3878 * for the packet fall back on the network
3882 list_for_each_entry_rcu(skp
, &smack_known_list
, list
) {
3883 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3886 * Compare the catsets. Use the netlbl APIs.
3888 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3889 if ((skp
->smk_netlabel
.flags
&
3890 NETLBL_SECATTR_MLS_CAT
) == 0)
3894 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3895 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3897 kcat
= netlbl_catmap_walk(
3898 skp
->smk_netlabel
.attr
.mls
.cat
,
3900 if (acat
< 0 || kcat
< 0)
3913 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3914 return &smack_known_web
;
3915 return &smack_known_star
;
3917 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0)
3919 * Looks like a fallback, which gives us a secid.
3921 return smack_from_secid(sap
->attr
.secid
);
3923 * Without guidance regarding the smack value
3924 * for the packet fall back on the network
3927 return smack_net_ambient
;
3930 #if IS_ENABLED(CONFIG_IPV6)
3931 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3935 int proto
= -EINVAL
;
3936 struct ipv6hdr _ipv6h
;
3937 struct ipv6hdr
*ip6
;
3939 struct tcphdr _tcph
, *th
;
3940 struct udphdr _udph
, *uh
;
3941 struct dccp_hdr _dccph
, *dh
;
3945 offset
= skb_network_offset(skb
);
3946 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3949 sip
->sin6_addr
= ip6
->saddr
;
3951 nexthdr
= ip6
->nexthdr
;
3952 offset
+= sizeof(_ipv6h
);
3953 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3960 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3962 sip
->sin6_port
= th
->source
;
3965 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3967 sip
->sin6_port
= uh
->source
;
3970 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3972 sip
->sin6_port
= dh
->dccph_sport
;
3977 #endif /* CONFIG_IPV6 */
3980 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3984 * Returns 0 if the packet should be delivered, an error code otherwise
3986 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3988 struct netlbl_lsm_secattr secattr
;
3989 struct socket_smack
*ssp
= sk
->sk_security
;
3990 struct smack_known
*skp
= NULL
;
3992 struct smk_audit_info ad
;
3994 struct lsm_network_audit net
;
3996 #if IS_ENABLED(CONFIG_IPV6)
3997 struct sockaddr_in6 sadd
;
3999 #endif /* CONFIG_IPV6 */
4001 switch (sk
->sk_family
) {
4003 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4005 * If there is a secmark use it rather than the CIPSO label.
4006 * If there is no secmark fall back to CIPSO.
4007 * The secmark is assumed to reflect policy better.
4009 if (skb
&& skb
->secmark
!= 0) {
4010 skp
= smack_from_secid(skb
->secmark
);
4013 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4015 * Translate what netlabel gave us.
4017 netlbl_secattr_init(&secattr
);
4019 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
4021 skp
= smack_from_secattr(&secattr
, ssp
);
4023 skp
= smack_net_ambient
;
4025 netlbl_secattr_destroy(&secattr
);
4027 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4031 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4032 ad
.a
.u
.net
->family
= sk
->sk_family
;
4033 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4034 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4037 * Receiving a packet requires that the other end
4038 * be able to write here. Read access is not required.
4039 * This is the simplist possible security model
4042 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4043 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
4046 netlbl_skbuff_err(skb
, sk
->sk_family
, rc
, 0);
4048 #if IS_ENABLED(CONFIG_IPV6)
4050 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
4051 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
4053 #ifdef SMACK_IPV6_SECMARK_LABELING
4054 if (skb
&& skb
->secmark
!= 0)
4055 skp
= smack_from_secid(skb
->secmark
);
4057 skp
= smack_ipv6host_label(&sadd
);
4059 skp
= smack_net_ambient
;
4061 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4062 ad
.a
.u
.net
->family
= sk
->sk_family
;
4063 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4064 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4065 #endif /* CONFIG_AUDIT */
4066 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4067 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4069 #endif /* SMACK_IPV6_SECMARK_LABELING */
4070 #ifdef SMACK_IPV6_PORT_LABELING
4071 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4072 #endif /* SMACK_IPV6_PORT_LABELING */
4074 #endif /* CONFIG_IPV6 */
4081 * smack_socket_getpeersec_stream - pull in packet label
4083 * @optval: user's destination
4084 * @optlen: size thereof
4087 * returns zero on success, an error code otherwise
4089 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4090 char __user
*optval
,
4091 int __user
*optlen
, unsigned len
)
4093 struct socket_smack
*ssp
;
4098 ssp
= sock
->sk
->sk_security
;
4099 if (ssp
->smk_packet
!= NULL
) {
4100 rcp
= ssp
->smk_packet
->smk_known
;
4101 slen
= strlen(rcp
) + 1;
4106 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4109 if (put_user(slen
, optlen
) != 0)
4117 * smack_socket_getpeersec_dgram - pull in packet label
4118 * @sock: the peer socket
4120 * @secid: pointer to where to put the secid of the packet
4122 * Sets the netlabel socket state on sk from parent
4124 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4125 struct sk_buff
*skb
, u32
*secid
)
4128 struct netlbl_lsm_secattr secattr
;
4129 struct socket_smack
*ssp
= NULL
;
4130 struct smack_known
*skp
;
4131 int family
= PF_UNSPEC
;
4132 u32 s
= 0; /* 0 is the invalid secid */
4136 if (skb
->protocol
== htons(ETH_P_IP
))
4138 #if IS_ENABLED(CONFIG_IPV6)
4139 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4141 #endif /* CONFIG_IPV6 */
4143 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4144 family
= sock
->sk
->sk_family
;
4148 ssp
= sock
->sk
->sk_security
;
4149 s
= ssp
->smk_out
->smk_secid
;
4152 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4158 * Translate what netlabel gave us.
4160 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4161 ssp
= sock
->sk
->sk_security
;
4162 netlbl_secattr_init(&secattr
);
4163 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4165 skp
= smack_from_secattr(&secattr
, ssp
);
4168 netlbl_secattr_destroy(&secattr
);
4171 #ifdef SMACK_IPV6_SECMARK_LABELING
4183 * smack_sock_graft - Initialize a newly created socket with an existing sock
4185 * @parent: parent socket
4187 * Set the smk_{in,out} state of an existing sock based on the process that
4188 * is creating the new socket.
4190 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4192 struct socket_smack
*ssp
;
4193 struct smack_known
*skp
= smk_of_current();
4196 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4199 ssp
= sk
->sk_security
;
4202 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4206 * smack_inet_conn_request - Smack access check on connect
4207 * @sk: socket involved
4211 * Returns 0 if a task with the packet label could write to
4212 * the socket, otherwise an error code
4214 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4215 struct request_sock
*req
)
4217 u16 family
= sk
->sk_family
;
4218 struct smack_known
*skp
;
4219 struct socket_smack
*ssp
= sk
->sk_security
;
4220 struct netlbl_lsm_secattr secattr
;
4221 struct sockaddr_in addr
;
4223 struct smack_known
*hskp
;
4225 struct smk_audit_info ad
;
4227 struct lsm_network_audit net
;
4230 #if IS_ENABLED(CONFIG_IPV6)
4231 if (family
== PF_INET6
) {
4233 * Handle mapped IPv4 packets arriving
4234 * via IPv6 sockets. Don't set up netlabel
4235 * processing on IPv6.
4237 if (skb
->protocol
== htons(ETH_P_IP
))
4242 #endif /* CONFIG_IPV6 */
4244 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4246 * If there is a secmark use it rather than the CIPSO label.
4247 * If there is no secmark fall back to CIPSO.
4248 * The secmark is assumed to reflect policy better.
4250 if (skb
&& skb
->secmark
!= 0) {
4251 skp
= smack_from_secid(skb
->secmark
);
4254 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4256 netlbl_secattr_init(&secattr
);
4257 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4259 skp
= smack_from_secattr(&secattr
, ssp
);
4261 skp
= &smack_known_huh
;
4262 netlbl_secattr_destroy(&secattr
);
4264 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4269 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4270 ad
.a
.u
.net
->family
= family
;
4271 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4272 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4275 * Receiving a packet requires that the other end be able to write
4276 * here. Read access is not required.
4278 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4279 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4284 * Save the peer's label in the request_sock so we can later setup
4285 * smk_packet in the child socket so that SO_PEERCRED can report it.
4287 req
->peer_secid
= skp
->smk_secid
;
4290 * We need to decide if we want to label the incoming connection here
4291 * if we do we only need to label the request_sock and the stack will
4292 * propagate the wire-label to the sock when it is created.
4295 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4297 hskp
= smack_ipv4host_label(&addr
);
4301 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4303 netlbl_req_delattr(req
);
4309 * smack_inet_csk_clone - Copy the connection information to the new socket
4310 * @sk: the new socket
4311 * @req: the connection's request_sock
4313 * Transfer the connection's peer label to the newly created socket.
4315 static void smack_inet_csk_clone(struct sock
*sk
,
4316 const struct request_sock
*req
)
4318 struct socket_smack
*ssp
= sk
->sk_security
;
4319 struct smack_known
*skp
;
4321 if (req
->peer_secid
!= 0) {
4322 skp
= smack_from_secid(req
->peer_secid
);
4323 ssp
->smk_packet
= skp
;
4325 ssp
->smk_packet
= NULL
;
4329 * Key management security hooks
4331 * Casey has not tested key support very heavily.
4332 * The permission check is most likely too restrictive.
4333 * If you care about keys please have a look.
4338 * smack_key_alloc - Set the key security blob
4340 * @cred: the credentials to use
4343 * No allocation required
4347 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4348 unsigned long flags
)
4350 struct smack_known
*skp
= smk_of_task(cred
->security
);
4352 key
->security
= skp
;
4357 * smack_key_free - Clear the key security blob
4360 * Clear the blob pointer
4362 static void smack_key_free(struct key
*key
)
4364 key
->security
= NULL
;
4368 * smack_key_permission - Smack access on a key
4369 * @key_ref: gets to the object
4370 * @cred: the credentials to use
4371 * @perm: requested key permissions
4373 * Return 0 if the task has read and write to the object,
4374 * an error code otherwise
4376 static int smack_key_permission(key_ref_t key_ref
,
4377 const struct cred
*cred
, unsigned perm
)
4380 struct smk_audit_info ad
;
4381 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4385 keyp
= key_ref_to_ptr(key_ref
);
4389 * If the key hasn't been initialized give it access so that
4392 if (keyp
->security
== NULL
)
4395 * This should not occur
4400 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4401 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4402 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4404 if (perm
& KEY_NEED_READ
)
4406 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4407 request
= MAY_WRITE
;
4408 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4409 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4414 * smack_key_getsecurity - Smack label tagging the key
4415 * @key points to the key to be queried
4416 * @_buffer points to a pointer that should be set to point to the
4417 * resulting string (if no label or an error occurs).
4418 * Return the length of the string (including terminating NUL) or -ve if
4420 * May also return 0 (and a NULL buffer pointer) if there is no label.
4422 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4424 struct smack_known
*skp
= key
->security
;
4428 if (key
->security
== NULL
) {
4433 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4436 length
= strlen(copy
) + 1;
4442 #endif /* CONFIG_KEYS */
4447 * Audit requires a unique representation of each Smack specific
4448 * rule. This unique representation is used to distinguish the
4449 * object to be audited from remaining kernel objects and also
4450 * works as a glue between the audit hooks.
4452 * Since repository entries are added but never deleted, we'll use
4453 * the smack_known label address related to the given audit rule as
4454 * the needed unique representation. This also better fits the smack
4455 * model where nearly everything is a label.
4460 * smack_audit_rule_init - Initialize a smack audit rule
4461 * @field: audit rule fields given from user-space (audit.h)
4462 * @op: required testing operator (=, !=, >, <, ...)
4463 * @rulestr: smack label to be audited
4464 * @vrule: pointer to save our own audit rule representation
4466 * Prepare to audit cases where (@field @op @rulestr) is true.
4467 * The label to be audited is created if necessay.
4469 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4471 struct smack_known
*skp
;
4472 char **rule
= (char **)vrule
;
4475 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4478 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4481 skp
= smk_import_entry(rulestr
, 0);
4483 return PTR_ERR(skp
);
4485 *rule
= skp
->smk_known
;
4491 * smack_audit_rule_known - Distinguish Smack audit rules
4492 * @krule: rule of interest, in Audit kernel representation format
4494 * This is used to filter Smack rules from remaining Audit ones.
4495 * If it's proved that this rule belongs to us, the
4496 * audit_rule_match hook will be called to do the final judgement.
4498 static int smack_audit_rule_known(struct audit_krule
*krule
)
4500 struct audit_field
*f
;
4503 for (i
= 0; i
< krule
->field_count
; i
++) {
4504 f
= &krule
->fields
[i
];
4506 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4514 * smack_audit_rule_match - Audit given object ?
4515 * @secid: security id for identifying the object to test
4516 * @field: audit rule flags given from user-space
4517 * @op: required testing operator
4518 * @vrule: smack internal rule presentation
4519 * @actx: audit context associated with the check
4521 * The core Audit hook. It's used to take the decision of
4522 * whether to audit or not to audit a given object.
4524 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4525 struct audit_context
*actx
)
4527 struct smack_known
*skp
;
4530 if (unlikely(!rule
)) {
4531 WARN_ONCE(1, "Smack: missing rule\n");
4535 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4538 skp
= smack_from_secid(secid
);
4541 * No need to do string comparisons. If a match occurs,
4542 * both pointers will point to the same smack_known
4545 if (op
== Audit_equal
)
4546 return (rule
== skp
->smk_known
);
4547 if (op
== Audit_not_equal
)
4548 return (rule
!= skp
->smk_known
);
4554 * There is no need for a smack_audit_rule_free hook.
4555 * No memory was allocated.
4558 #endif /* CONFIG_AUDIT */
4561 * smack_ismaclabel - check if xattr @name references a smack MAC label
4562 * @name: Full xattr name to check.
4564 static int smack_ismaclabel(const char *name
)
4566 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4571 * smack_secid_to_secctx - return the smack label for a secid
4572 * @secid: incoming integer
4573 * @secdata: destination
4574 * @seclen: how long it is
4576 * Exists for networking code.
4578 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4580 struct smack_known
*skp
= smack_from_secid(secid
);
4583 *secdata
= skp
->smk_known
;
4584 *seclen
= strlen(skp
->smk_known
);
4589 * smack_secctx_to_secid - return the secid for a smack label
4590 * @secdata: smack label
4591 * @seclen: how long result is
4592 * @secid: outgoing integer
4594 * Exists for audit and networking code.
4596 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4598 struct smack_known
*skp
= smk_find_entry(secdata
);
4601 *secid
= skp
->smk_secid
;
4608 * There used to be a smack_release_secctx hook
4609 * that did nothing back when hooks were in a vector.
4610 * Now that there's a list such a hook adds cost.
4613 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4615 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4618 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4620 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4623 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4626 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4634 static struct security_hook_list smack_hooks
[] __lsm_ro_after_init
= {
4635 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4636 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4637 LSM_HOOK_INIT(syslog
, smack_syslog
),
4639 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4640 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4641 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4642 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4643 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4644 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4645 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4647 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4648 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4649 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4651 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4652 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4653 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4654 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4655 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4656 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4657 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4658 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4659 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4660 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4661 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4662 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4663 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4664 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4665 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4666 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4667 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4668 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4670 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4671 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4672 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4673 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4674 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4675 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4676 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4677 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4678 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4679 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4681 LSM_HOOK_INIT(file_open
, smack_file_open
),
4683 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4684 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4685 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4686 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4687 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4688 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4689 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4690 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4691 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4692 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4693 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4694 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4695 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4696 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4697 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4698 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4699 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4700 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4702 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4703 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4705 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4706 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4708 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4709 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4710 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4711 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4712 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4713 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4715 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4716 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4717 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4718 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4719 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4721 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4722 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4723 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4724 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4725 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4727 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4729 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4730 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4732 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4733 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4735 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4736 #ifdef SMACK_IPV6_PORT_LABELING
4737 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4739 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4740 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4741 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4742 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4743 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4744 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4745 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4746 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4747 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4748 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4750 /* key management security hooks */
4752 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4753 LSM_HOOK_INIT(key_free
, smack_key_free
),
4754 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4755 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4756 #endif /* CONFIG_KEYS */
4760 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4761 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4762 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4763 #endif /* CONFIG_AUDIT */
4765 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4766 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4767 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4768 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4769 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4770 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4774 static __init
void init_smack_known_list(void)
4777 * Initialize rule list locks
4779 mutex_init(&smack_known_huh
.smk_rules_lock
);
4780 mutex_init(&smack_known_hat
.smk_rules_lock
);
4781 mutex_init(&smack_known_floor
.smk_rules_lock
);
4782 mutex_init(&smack_known_star
.smk_rules_lock
);
4783 mutex_init(&smack_known_web
.smk_rules_lock
);
4785 * Initialize rule lists
4787 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4788 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4789 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4790 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4791 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4793 * Create the known labels list
4795 smk_insert_entry(&smack_known_huh
);
4796 smk_insert_entry(&smack_known_hat
);
4797 smk_insert_entry(&smack_known_star
);
4798 smk_insert_entry(&smack_known_floor
);
4799 smk_insert_entry(&smack_known_web
);
4803 * smack_init - initialize the smack system
4807 static __init
int smack_init(void)
4810 struct task_smack
*tsp
;
4812 if (!security_module_enable("smack"))
4815 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4816 if (!smack_inode_cache
)
4819 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4822 kmem_cache_destroy(smack_inode_cache
);
4828 pr_info("Smack: Initializing.\n");
4829 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4830 pr_info("Smack: Netfilter enabled.\n");
4832 #ifdef SMACK_IPV6_PORT_LABELING
4833 pr_info("Smack: IPv6 port labeling enabled.\n");
4835 #ifdef SMACK_IPV6_SECMARK_LABELING
4836 pr_info("Smack: IPv6 Netfilter enabled.\n");
4840 * Set the security state for the initial task.
4842 cred
= (struct cred
*) current
->cred
;
4843 cred
->security
= tsp
;
4845 /* initialize the smack_known_list */
4846 init_smack_known_list();
4851 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
), "smack");
4857 * Smack requires early initialization in order to label
4858 * all processes and objects when they are created.
4860 security_initcall(smack_init
);