2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 static LIST_HEAD(smk_ipv6_port_list
);
57 static struct kmem_cache
*smack_inode_cache
;
60 static const match_table_t smk_mount_tokens
= {
61 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
62 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
63 {Opt_fshat
, SMK_FSHAT
"%s"},
64 {Opt_fsroot
, SMK_FSROOT
"%s"},
65 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
69 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
70 static char *smk_bu_mess
[] = {
71 "Bringup Error", /* Unused */
72 "Bringup", /* SMACK_BRINGUP_ALLOW */
73 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
74 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
77 static void smk_bu_mode(int mode
, char *s
)
87 if (mode
& MAY_APPEND
)
89 if (mode
& MAY_TRANSMUTE
)
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
100 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
101 struct smack_known
*oskp
, int mode
, int rc
)
103 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
107 if (rc
> SMACK_UNCONFINED_OBJECT
)
110 smk_bu_mode(mode
, acc
);
111 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
112 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
116 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
123 struct task_smack
*tsp
= current_security();
124 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
128 if (rc
> SMACK_UNCONFINED_OBJECT
)
131 smk_bu_mode(mode
, acc
);
132 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
133 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
134 acc
, current
->comm
, note
);
138 #define smk_bu_current(note, oskp, mode, RC) (RC)
141 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
142 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
144 struct task_smack
*tsp
= current_security();
145 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
146 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
150 if (rc
> SMACK_UNCONFINED_OBJECT
)
153 smk_bu_mode(mode
, acc
);
154 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
155 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
156 current
->comm
, otp
->comm
);
160 #define smk_bu_task(otp, mode, RC) (RC)
163 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
164 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
166 struct task_smack
*tsp
= current_security();
167 struct inode_smack
*isp
= inode
->i_security
;
168 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
170 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
171 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
172 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
176 if (rc
> SMACK_UNCONFINED_OBJECT
)
178 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
179 (mode
& (MAY_WRITE
| MAY_APPEND
)))
180 isp
->smk_flags
|= SMK_INODE_IMPURE
;
182 smk_bu_mode(mode
, acc
);
184 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
185 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
186 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
190 #define smk_bu_inode(inode, mode, RC) (RC)
193 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
194 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
196 struct task_smack
*tsp
= current_security();
197 struct smack_known
*sskp
= tsp
->smk_task
;
198 struct inode
*inode
= file_inode(file
);
199 struct inode_smack
*isp
= inode
->i_security
;
200 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
202 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
203 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
204 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
208 if (rc
> SMACK_UNCONFINED_OBJECT
)
211 smk_bu_mode(mode
, acc
);
212 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
213 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
214 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
219 #define smk_bu_file(file, mode, RC) (RC)
222 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
223 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
226 struct task_smack
*tsp
= cred
->security
;
227 struct smack_known
*sskp
= tsp
->smk_task
;
228 struct inode
*inode
= file
->f_inode
;
229 struct inode_smack
*isp
= inode
->i_security
;
230 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
232 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
233 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
234 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
238 if (rc
> SMACK_UNCONFINED_OBJECT
)
241 smk_bu_mode(mode
, acc
);
242 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
243 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
244 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
249 #define smk_bu_credfile(cred, file, mode, RC) (RC)
253 * smk_fetch - Fetch the smack label from a file.
254 * @name: type of the label (attribute)
255 * @ip: a pointer to the inode
256 * @dp: a pointer to the dentry
258 * Returns a pointer to the master list entry for the Smack label,
259 * NULL if there was no label to fetch, or an error code.
261 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
266 struct smack_known
*skp
= NULL
;
268 if (ip
->i_op
->getxattr
== NULL
)
269 return ERR_PTR(-EOPNOTSUPP
);
271 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
273 return ERR_PTR(-ENOMEM
);
275 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
281 skp
= smk_import_entry(buffer
, rc
);
289 * new_inode_smack - allocate an inode security blob
290 * @skp: a pointer to the Smack label entry to use in the blob
292 * Returns the new blob or NULL if there's no memory available
294 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
296 struct inode_smack
*isp
;
298 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
302 isp
->smk_inode
= skp
;
304 mutex_init(&isp
->smk_lock
);
310 * new_task_smack - allocate a task security blob
311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
315 * Returns the new blob or NULL if there's no memory available
317 static struct task_smack
*new_task_smack(struct smack_known
*task
,
318 struct smack_known
*forked
, gfp_t gfp
)
320 struct task_smack
*tsp
;
322 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
326 tsp
->smk_task
= task
;
327 tsp
->smk_forked
= forked
;
328 INIT_LIST_HEAD(&tsp
->smk_rules
);
329 INIT_LIST_HEAD(&tsp
->smk_relabel
);
330 mutex_init(&tsp
->smk_rules_lock
);
336 * smk_copy_rules - copy a rule set
337 * @nhead: new rules header pointer
338 * @ohead: old rules header pointer
339 * @gfp: type of the memory for the allocation
341 * Returns 0 on success, -ENOMEM on error
343 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
346 struct smack_rule
*nrp
;
347 struct smack_rule
*orp
;
350 INIT_LIST_HEAD(nhead
);
352 list_for_each_entry_rcu(orp
, ohead
, list
) {
353 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
359 list_add_rcu(&nrp
->list
, nhead
);
365 * smk_copy_relabel - copy smk_relabel labels list
366 * @nhead: new rules header pointer
367 * @ohead: old rules header pointer
368 * @gfp: type of the memory for the allocation
370 * Returns 0 on success, -ENOMEM on error
372 static int smk_copy_relabel(struct list_head
*nhead
, struct list_head
*ohead
,
375 struct smack_known_list_elem
*nklep
;
376 struct smack_known_list_elem
*oklep
;
378 INIT_LIST_HEAD(nhead
);
380 list_for_each_entry(oklep
, ohead
, list
) {
381 nklep
= kzalloc(sizeof(struct smack_known_list_elem
), gfp
);
383 smk_destroy_label_list(nhead
);
386 nklep
->smk_label
= oklep
->smk_label
;
387 list_add(&nklep
->list
, nhead
);
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode - input mode in form of PTRACE_MODE_*
397 * Returns a converted MAY_* mode usable by smack rules
399 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
402 case PTRACE_MODE_READ
:
404 case PTRACE_MODE_ATTACH
:
405 return MAY_READWRITE
;
412 * smk_ptrace_rule_check - helper for ptrace access
413 * @tracer: tracer process
414 * @tracee_known: label entry of the process that's about to be traced
415 * @mode: ptrace attachment mode (PTRACE_MODE_*)
416 * @func: name of the function that called us, used for audit
418 * Returns 0 on access granted, -error on error
420 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
421 struct smack_known
*tracee_known
,
422 unsigned int mode
, const char *func
)
425 struct smk_audit_info ad
, *saip
= NULL
;
426 struct task_smack
*tsp
;
427 struct smack_known
*tracer_known
;
429 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
430 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
431 smk_ad_setfield_u_tsk(&ad
, tracer
);
436 tsp
= __task_cred(tracer
)->security
;
437 tracer_known
= smk_of_task(tsp
);
439 if ((mode
& PTRACE_MODE_ATTACH
) &&
440 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
441 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
442 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
444 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
446 else if (capable(CAP_SYS_PTRACE
))
452 smack_log(tracer_known
->smk_known
,
453 tracee_known
->smk_known
,
460 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
461 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
469 * We he, that is fun!
473 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
474 * @ctp: child task pointer
475 * @mode: ptrace attachment mode (PTRACE_MODE_*)
477 * Returns 0 if access is OK, an error code otherwise
479 * Do the capability checks.
481 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
483 struct smack_known
*skp
;
485 skp
= smk_of_task_struct(ctp
);
487 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
491 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
492 * @ptp: parent task pointer
494 * Returns 0 if access is OK, an error code otherwise
496 * Do the capability checks, and require PTRACE_MODE_ATTACH.
498 static int smack_ptrace_traceme(struct task_struct
*ptp
)
501 struct smack_known
*skp
;
503 skp
= smk_of_task(current_security());
505 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
510 * smack_syslog - Smack approval on syslog
511 * @type: message type
513 * Returns 0 on success, error code otherwise.
515 static int smack_syslog(int typefrom_file
)
518 struct smack_known
*skp
= smk_of_current();
520 if (smack_privileged(CAP_MAC_OVERRIDE
))
523 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
535 * smack_sb_alloc_security - allocate a superblock blob
536 * @sb: the superblock getting the blob
538 * Returns 0 on success or -ENOMEM on error.
540 static int smack_sb_alloc_security(struct super_block
*sb
)
542 struct superblock_smack
*sbsp
;
544 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
549 sbsp
->smk_root
= &smack_known_floor
;
550 sbsp
->smk_default
= &smack_known_floor
;
551 sbsp
->smk_floor
= &smack_known_floor
;
552 sbsp
->smk_hat
= &smack_known_hat
;
554 * smk_initialized will be zero from kzalloc.
556 sb
->s_security
= sbsp
;
562 * smack_sb_free_security - free a superblock blob
563 * @sb: the superblock getting the blob
566 static void smack_sb_free_security(struct super_block
*sb
)
568 kfree(sb
->s_security
);
569 sb
->s_security
= NULL
;
573 * smack_sb_copy_data - copy mount options data for processing
574 * @orig: where to start
575 * @smackopts: mount options string
577 * Returns 0 on success or -ENOMEM on error.
579 * Copy the Smack specific mount options out of the mount
582 static int smack_sb_copy_data(char *orig
, char *smackopts
)
584 char *cp
, *commap
, *otheropts
, *dp
;
586 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
587 if (otheropts
== NULL
)
590 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
591 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
593 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
595 else if (strstr(cp
, SMK_FSHAT
) == cp
)
597 else if (strstr(cp
, SMK_FSROOT
) == cp
)
599 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
604 commap
= strchr(cp
, ',');
613 strcpy(orig
, otheropts
);
614 free_page((unsigned long)otheropts
);
620 * smack_parse_opts_str - parse Smack specific mount options
621 * @options: mount options string
622 * @opts: where to store converted mount opts
624 * Returns 0 on success or -ENOMEM on error.
626 * converts Smack specific mount options to generic security option format
628 static int smack_parse_opts_str(char *options
,
629 struct security_mnt_opts
*opts
)
632 char *fsdefault
= NULL
;
633 char *fsfloor
= NULL
;
636 char *fstransmute
= NULL
;
638 int num_mnt_opts
= 0;
641 opts
->num_mnt_opts
= 0;
646 while ((p
= strsep(&options
, ",")) != NULL
) {
647 substring_t args
[MAX_OPT_ARGS
];
652 token
= match_token(p
, smk_mount_tokens
, args
);
658 fsdefault
= match_strdup(&args
[0]);
665 fsfloor
= match_strdup(&args
[0]);
672 fshat
= match_strdup(&args
[0]);
679 fsroot
= match_strdup(&args
[0]);
683 case Opt_fstransmute
:
686 fstransmute
= match_strdup(&args
[0]);
692 pr_warn("Smack: unknown mount option\n");
697 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_ATOMIC
);
701 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
703 if (!opts
->mnt_opts_flags
) {
704 kfree(opts
->mnt_opts
);
709 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
710 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
713 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
714 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
717 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
718 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
721 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
722 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
725 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
726 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
729 opts
->num_mnt_opts
= num_mnt_opts
;
734 pr_warn("Smack: duplicate mount options\n");
746 * smack_set_mnt_opts - set Smack specific mount options
747 * @sb: the file system superblock
748 * @opts: Smack mount options
749 * @kern_flags: mount option from kernel space or user space
750 * @set_kern_flags: where to store converted mount opts
752 * Returns 0 on success, an error code on failure
754 * Allow filesystems with binary mount data to explicitly set Smack mount
757 static int smack_set_mnt_opts(struct super_block
*sb
,
758 struct security_mnt_opts
*opts
,
759 unsigned long kern_flags
,
760 unsigned long *set_kern_flags
)
762 struct dentry
*root
= sb
->s_root
;
763 struct inode
*inode
= d_backing_inode(root
);
764 struct superblock_smack
*sp
= sb
->s_security
;
765 struct inode_smack
*isp
;
766 struct smack_known
*skp
;
768 int num_opts
= opts
->num_mnt_opts
;
771 if (sp
->smk_initialized
)
774 sp
->smk_initialized
= 1;
776 for (i
= 0; i
< num_opts
; i
++) {
777 switch (opts
->mnt_opts_flags
[i
]) {
779 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
782 sp
->smk_default
= skp
;
785 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
791 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
797 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
803 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
814 if (!smack_privileged(CAP_MAC_ADMIN
)) {
816 * Unprivileged mounts don't get to specify Smack values.
821 * Unprivileged mounts get root and default from the caller.
823 skp
= smk_of_current();
825 sp
->smk_default
= skp
;
829 * Initialize the root inode.
831 isp
= inode
->i_security
;
833 isp
= new_inode_smack(sp
->smk_root
);
836 inode
->i_security
= isp
;
838 isp
->smk_inode
= sp
->smk_root
;
841 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
847 * smack_sb_kern_mount - Smack specific mount processing
848 * @sb: the file system superblock
849 * @flags: the mount flags
850 * @data: the smack mount options
852 * Returns 0 on success, an error code on failure
854 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
857 char *options
= data
;
858 struct security_mnt_opts opts
;
860 security_init_mnt_opts(&opts
);
865 rc
= smack_parse_opts_str(options
, &opts
);
870 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
873 security_free_mnt_opts(&opts
);
878 * smack_sb_statfs - Smack check on statfs
879 * @dentry: identifies the file system in question
881 * Returns 0 if current can read the floor of the filesystem,
882 * and error code otherwise
884 static int smack_sb_statfs(struct dentry
*dentry
)
886 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
888 struct smk_audit_info ad
;
890 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
891 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
893 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
894 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
903 * smack_bprm_set_creds - set creds for exec
904 * @bprm: the exec information
906 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
908 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
910 struct inode
*inode
= file_inode(bprm
->file
);
911 struct task_smack
*bsp
= bprm
->cred
->security
;
912 struct inode_smack
*isp
;
915 if (bprm
->cred_prepared
)
918 isp
= inode
->i_security
;
919 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
922 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
923 struct task_struct
*tracer
;
927 tracer
= ptrace_parent(current
);
928 if (likely(tracer
!= NULL
))
929 rc
= smk_ptrace_rule_check(tracer
,
937 } else if (bprm
->unsafe
)
940 bsp
->smk_task
= isp
->smk_task
;
941 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
947 * smack_bprm_committing_creds - Prepare to install the new credentials
950 * @bprm: binprm for exec
952 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
954 struct task_smack
*bsp
= bprm
->cred
->security
;
956 if (bsp
->smk_task
!= bsp
->smk_forked
)
957 current
->pdeath_signal
= 0;
961 * smack_bprm_secureexec - Return the decision to use secureexec.
962 * @bprm: binprm for exec
964 * Returns 0 on success.
966 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
968 struct task_smack
*tsp
= current_security();
970 if (tsp
->smk_task
!= tsp
->smk_forked
)
981 * smack_inode_alloc_security - allocate an inode blob
982 * @inode: the inode in need of a blob
984 * Returns 0 if it gets a blob, -ENOMEM otherwise
986 static int smack_inode_alloc_security(struct inode
*inode
)
988 struct smack_known
*skp
= smk_of_current();
990 inode
->i_security
= new_inode_smack(skp
);
991 if (inode
->i_security
== NULL
)
997 * smack_inode_free_security - free an inode blob
998 * @inode: the inode with a blob
1000 * Clears the blob pointer in inode
1002 static void smack_inode_free_security(struct inode
*inode
)
1004 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
1005 inode
->i_security
= NULL
;
1009 * smack_inode_init_security - copy out the smack from an inode
1010 * @inode: the newly created inode
1011 * @dir: containing directory object
1013 * @name: where to put the attribute name
1014 * @value: where to put the attribute value
1015 * @len: where to put the length of the attribute
1017 * Returns 0 if it all works out, -ENOMEM if there's no memory
1019 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1020 const struct qstr
*qstr
, const char **name
,
1021 void **value
, size_t *len
)
1023 struct inode_smack
*issp
= inode
->i_security
;
1024 struct smack_known
*skp
= smk_of_current();
1025 struct smack_known
*isp
= smk_of_inode(inode
);
1026 struct smack_known
*dsp
= smk_of_inode(dir
);
1030 *name
= XATTR_SMACK_SUFFIX
;
1034 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1039 * If the access rule allows transmutation and
1040 * the directory requests transmutation then
1041 * by all means transmute.
1042 * Mark the inode as changed.
1044 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1045 smk_inode_transmutable(dir
)) {
1047 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1050 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1054 *len
= strlen(isp
->smk_known
);
1061 * smack_inode_link - Smack check on link
1062 * @old_dentry: the existing object
1064 * @new_dentry: the new object
1066 * Returns 0 if access is permitted, an error code otherwise
1068 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1069 struct dentry
*new_dentry
)
1071 struct smack_known
*isp
;
1072 struct smk_audit_info ad
;
1075 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1076 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1078 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1079 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1080 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1082 if (rc
== 0 && d_is_positive(new_dentry
)) {
1083 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1084 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1085 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1086 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1093 * smack_inode_unlink - Smack check on inode deletion
1094 * @dir: containing directory object
1095 * @dentry: file to unlink
1097 * Returns 0 if current can write the containing directory
1098 * and the object, error code otherwise
1100 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1102 struct inode
*ip
= d_backing_inode(dentry
);
1103 struct smk_audit_info ad
;
1106 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1107 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1110 * You need write access to the thing you're unlinking
1112 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1113 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1116 * You also need write access to the containing directory
1118 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1119 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1120 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1121 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1127 * smack_inode_rmdir - Smack check on directory deletion
1128 * @dir: containing directory object
1129 * @dentry: directory to unlink
1131 * Returns 0 if current can write the containing directory
1132 * and the directory, error code otherwise
1134 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1136 struct smk_audit_info ad
;
1139 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1140 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1143 * You need write access to the thing you're removing
1145 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1146 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1149 * You also need write access to the containing directory
1151 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1152 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1153 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1154 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1161 * smack_inode_rename - Smack check on rename
1162 * @old_inode: unused
1163 * @old_dentry: the old object
1164 * @new_inode: unused
1165 * @new_dentry: the new object
1167 * Read and write access is required on both the old and
1170 * Returns 0 if access is permitted, an error code otherwise
1172 static int smack_inode_rename(struct inode
*old_inode
,
1173 struct dentry
*old_dentry
,
1174 struct inode
*new_inode
,
1175 struct dentry
*new_dentry
)
1178 struct smack_known
*isp
;
1179 struct smk_audit_info ad
;
1181 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1182 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1184 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1185 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1186 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1188 if (rc
== 0 && d_is_positive(new_dentry
)) {
1189 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1190 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1191 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1192 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1198 * smack_inode_permission - Smack version of permission()
1199 * @inode: the inode in question
1200 * @mask: the access requested
1202 * This is the important Smack hook.
1204 * Returns 0 if access is permitted, -EACCES otherwise
1206 static int smack_inode_permission(struct inode
*inode
, int mask
)
1208 struct smk_audit_info ad
;
1209 int no_block
= mask
& MAY_NOT_BLOCK
;
1212 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1214 * No permission to check. Existence test. Yup, it's there.
1219 /* May be droppable after audit */
1222 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1223 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1224 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1225 rc
= smk_bu_inode(inode
, mask
, rc
);
1230 * smack_inode_setattr - Smack check for setting attributes
1231 * @dentry: the object
1232 * @iattr: for the force flag
1234 * Returns 0 if access is permitted, an error code otherwise
1236 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1238 struct smk_audit_info ad
;
1242 * Need to allow for clearing the setuid bit.
1244 if (iattr
->ia_valid
& ATTR_FORCE
)
1246 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1247 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1249 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1250 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1255 * smack_inode_getattr - Smack check for getting attributes
1256 * @mnt: vfsmount of the object
1257 * @dentry: the object
1259 * Returns 0 if access is permitted, an error code otherwise
1261 static int smack_inode_getattr(const struct path
*path
)
1263 struct smk_audit_info ad
;
1264 struct inode
*inode
= d_backing_inode(path
->dentry
);
1267 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1268 smk_ad_setfield_u_fs_path(&ad
, *path
);
1269 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1270 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1275 * smack_inode_setxattr - Smack check for setting xattrs
1276 * @dentry: the object
1277 * @name: name of the attribute
1278 * @value: value of the attribute
1279 * @size: size of the value
1282 * This protects the Smack attribute explicitly.
1284 * Returns 0 if access is permitted, an error code otherwise
1286 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1287 const void *value
, size_t size
, int flags
)
1289 struct smk_audit_info ad
;
1290 struct smack_known
*skp
;
1292 int check_import
= 0;
1297 * Check label validity here so import won't fail in post_setxattr
1299 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1300 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1301 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1304 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1305 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1309 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1311 if (size
!= TRANS_TRUE_SIZE
||
1312 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1315 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1317 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1320 if (rc
== 0 && check_import
) {
1321 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1324 else if (skp
== NULL
|| (check_star
&&
1325 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1329 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1330 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1333 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1334 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1341 * smack_inode_post_setxattr - Apply the Smack update approved above
1343 * @name: attribute name
1344 * @value: attribute value
1345 * @size: attribute size
1348 * Set the pointer in the inode blob to the entry found
1349 * in the master label list.
1351 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1352 const void *value
, size_t size
, int flags
)
1354 struct smack_known
*skp
;
1355 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1357 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1358 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1362 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1363 skp
= smk_import_entry(value
, size
);
1365 isp
->smk_inode
= skp
;
1367 isp
->smk_inode
= &smack_known_invalid
;
1368 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1369 skp
= smk_import_entry(value
, size
);
1371 isp
->smk_task
= skp
;
1373 isp
->smk_task
= &smack_known_invalid
;
1374 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1375 skp
= smk_import_entry(value
, size
);
1377 isp
->smk_mmap
= skp
;
1379 isp
->smk_mmap
= &smack_known_invalid
;
1386 * smack_inode_getxattr - Smack check on getxattr
1387 * @dentry: the object
1390 * Returns 0 if access is permitted, an error code otherwise
1392 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1394 struct smk_audit_info ad
;
1397 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1398 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1400 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1401 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1406 * smack_inode_removexattr - Smack check on removexattr
1407 * @dentry: the object
1408 * @name: name of the attribute
1410 * Removing the Smack attribute requires CAP_MAC_ADMIN
1412 * Returns 0 if access is permitted, an error code otherwise
1414 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1416 struct inode_smack
*isp
;
1417 struct smk_audit_info ad
;
1420 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1421 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1422 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1423 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1424 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1425 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1426 if (!smack_privileged(CAP_MAC_ADMIN
))
1429 rc
= cap_inode_removexattr(dentry
, name
);
1434 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1435 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1437 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1438 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1442 isp
= d_backing_inode(dentry
)->i_security
;
1444 * Don't do anything special for these.
1445 * XATTR_NAME_SMACKIPIN
1446 * XATTR_NAME_SMACKIPOUT
1447 * XATTR_NAME_SMACKEXEC
1449 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1450 isp
->smk_task
= NULL
;
1451 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1452 isp
->smk_mmap
= NULL
;
1453 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1454 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1460 * smack_inode_getsecurity - get smack xattrs
1461 * @inode: the object
1462 * @name: attribute name
1463 * @buffer: where to put the result
1466 * Returns the size of the attribute or an error code
1468 static int smack_inode_getsecurity(const struct inode
*inode
,
1469 const char *name
, void **buffer
,
1472 struct socket_smack
*ssp
;
1473 struct socket
*sock
;
1474 struct super_block
*sbp
;
1475 struct inode
*ip
= (struct inode
*)inode
;
1476 struct smack_known
*isp
;
1480 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1481 isp
= smk_of_inode(inode
);
1482 ilen
= strlen(isp
->smk_known
);
1483 *buffer
= isp
->smk_known
;
1488 * The rest of the Smack xattrs are only on sockets.
1491 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1494 sock
= SOCKET_I(ip
);
1495 if (sock
== NULL
|| sock
->sk
== NULL
)
1498 ssp
= sock
->sk
->sk_security
;
1500 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1502 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1507 ilen
= strlen(isp
->smk_known
);
1509 *buffer
= isp
->smk_known
;
1518 * smack_inode_listsecurity - list the Smack attributes
1519 * @inode: the object
1520 * @buffer: where they go
1521 * @buffer_size: size of buffer
1523 * Returns 0 on success, -EINVAL otherwise
1525 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1528 int len
= sizeof(XATTR_NAME_SMACK
);
1530 if (buffer
!= NULL
&& len
<= buffer_size
)
1531 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1537 * smack_inode_getsecid - Extract inode's security id
1538 * @inode: inode to extract the info from
1539 * @secid: where result will be saved
1541 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1543 struct inode_smack
*isp
= inode
->i_security
;
1545 *secid
= isp
->smk_inode
->smk_secid
;
1553 * smack_file_permission - Smack check on file operations
1559 * Should access checks be done on each read or write?
1560 * UNICOS and SELinux say yes.
1561 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1563 * I'll say no for now. Smack does not do the frequent
1564 * label changing that SELinux does.
1566 static int smack_file_permission(struct file
*file
, int mask
)
1572 * smack_file_alloc_security - assign a file security blob
1575 * The security blob for a file is a pointer to the master
1576 * label list, so no allocation is done.
1578 * f_security is the owner security information. It
1579 * isn't used on file access checks, it's for send_sigio.
1583 static int smack_file_alloc_security(struct file
*file
)
1585 struct smack_known
*skp
= smk_of_current();
1587 file
->f_security
= skp
;
1592 * smack_file_free_security - clear a file security blob
1595 * The security blob for a file is a pointer to the master
1596 * label list, so no memory is freed.
1598 static void smack_file_free_security(struct file
*file
)
1600 file
->f_security
= NULL
;
1604 * smack_file_ioctl - Smack check on ioctls
1609 * Relies heavily on the correct use of the ioctl command conventions.
1611 * Returns 0 if allowed, error code otherwise
1613 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1617 struct smk_audit_info ad
;
1618 struct inode
*inode
= file_inode(file
);
1620 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1621 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1623 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1624 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1625 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1628 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1629 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1630 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1637 * smack_file_lock - Smack check on file locking
1641 * Returns 0 if current has lock access, error code otherwise
1643 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1645 struct smk_audit_info ad
;
1647 struct inode
*inode
= file_inode(file
);
1649 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1650 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1651 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1652 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1657 * smack_file_fcntl - Smack check on fcntl
1659 * @cmd: what action to check
1662 * Generally these operations are harmless.
1663 * File locking operations present an obvious mechanism
1664 * for passing information, so they require write access.
1666 * Returns 0 if current has access, error code otherwise
1668 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1671 struct smk_audit_info ad
;
1673 struct inode
*inode
= file_inode(file
);
1680 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1681 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1682 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1683 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1687 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1688 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1689 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1690 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1701 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1702 * if mapping anonymous memory.
1703 * @file contains the file structure for file to map (may be NULL).
1704 * @reqprot contains the protection requested by the application.
1705 * @prot contains the protection that will be applied by the kernel.
1706 * @flags contains the operational flags.
1707 * Return 0 if permission is granted.
1709 static int smack_mmap_file(struct file
*file
,
1710 unsigned long reqprot
, unsigned long prot
,
1711 unsigned long flags
)
1713 struct smack_known
*skp
;
1714 struct smack_known
*mkp
;
1715 struct smack_rule
*srp
;
1716 struct task_smack
*tsp
;
1717 struct smack_known
*okp
;
1718 struct inode_smack
*isp
;
1727 isp
= file_inode(file
)->i_security
;
1728 if (isp
->smk_mmap
== NULL
)
1730 mkp
= isp
->smk_mmap
;
1732 tsp
= current_security();
1733 skp
= smk_of_current();
1738 * For each Smack rule associated with the subject
1739 * label verify that the SMACK64MMAP also has access
1740 * to that rule's object label.
1742 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1743 okp
= srp
->smk_object
;
1745 * Matching labels always allows access.
1747 if (mkp
->smk_known
== okp
->smk_known
)
1750 * If there is a matching local rule take
1751 * that into account as well.
1753 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1757 may
= srp
->smk_access
;
1759 may
&= srp
->smk_access
;
1761 * If may is zero the SMACK64MMAP subject can't
1762 * possibly have less access.
1768 * Fetch the global list entry.
1769 * If there isn't one a SMACK64MMAP subject
1770 * can't have as much access as current.
1772 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1774 if (mmay
== -ENOENT
) {
1779 * If there is a local entry it modifies the
1780 * potential access, too.
1782 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1784 if (tmay
!= -ENOENT
)
1788 * If there is any access available to current that is
1789 * not available to a SMACK64MMAP subject
1792 if ((may
| mmay
) != mmay
) {
1804 * smack_file_set_fowner - set the file security blob value
1805 * @file: object in question
1808 static void smack_file_set_fowner(struct file
*file
)
1810 file
->f_security
= smk_of_current();
1814 * smack_file_send_sigiotask - Smack on sigio
1815 * @tsk: The target task
1816 * @fown: the object the signal come from
1819 * Allow a privileged task to get signals even if it shouldn't
1821 * Returns 0 if a subject with the object's smack could
1822 * write to the task, an error code otherwise.
1824 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1825 struct fown_struct
*fown
, int signum
)
1827 struct smack_known
*skp
;
1828 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1831 struct smk_audit_info ad
;
1834 * struct fown_struct is never outside the context of a struct file
1836 file
= container_of(fown
, struct file
, f_owner
);
1838 /* we don't log here as rc can be overriden */
1839 skp
= file
->f_security
;
1840 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1841 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1842 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1845 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1846 smk_ad_setfield_u_tsk(&ad
, tsk
);
1847 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1852 * smack_file_receive - Smack file receive check
1855 * Returns 0 if current has access, error code otherwise
1857 static int smack_file_receive(struct file
*file
)
1861 struct smk_audit_info ad
;
1862 struct inode
*inode
= file_inode(file
);
1864 if (unlikely(IS_PRIVATE(inode
)))
1867 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1868 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1870 * This code relies on bitmasks.
1872 if (file
->f_mode
& FMODE_READ
)
1874 if (file
->f_mode
& FMODE_WRITE
)
1877 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1878 rc
= smk_bu_file(file
, may
, rc
);
1883 * smack_file_open - Smack dentry open processing
1885 * @cred: task credential
1887 * Set the security blob in the file structure.
1888 * Allow the open only if the task has read access. There are
1889 * many read operations (e.g. fstat) that you can do with an
1890 * fd even if you have the file open write-only.
1894 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1896 struct task_smack
*tsp
= cred
->security
;
1897 struct inode
*inode
= file_inode(file
);
1898 struct smk_audit_info ad
;
1901 if (smack_privileged(CAP_MAC_OVERRIDE
))
1904 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1905 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1906 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1907 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1917 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1918 * @new: the new credentials
1919 * @gfp: the atomicity of any memory allocations
1921 * Prepare a blank set of credentials for modification. This must allocate all
1922 * the memory the LSM module might require such that cred_transfer() can
1923 * complete without error.
1925 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1927 struct task_smack
*tsp
;
1929 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1933 cred
->security
= tsp
;
1940 * smack_cred_free - "free" task-level security credentials
1941 * @cred: the credentials in question
1944 static void smack_cred_free(struct cred
*cred
)
1946 struct task_smack
*tsp
= cred
->security
;
1947 struct smack_rule
*rp
;
1948 struct list_head
*l
;
1949 struct list_head
*n
;
1953 cred
->security
= NULL
;
1955 smk_destroy_label_list(&tsp
->smk_relabel
);
1957 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1958 rp
= list_entry(l
, struct smack_rule
, list
);
1959 list_del(&rp
->list
);
1966 * smack_cred_prepare - prepare new set of credentials for modification
1967 * @new: the new credentials
1968 * @old: the original credentials
1969 * @gfp: the atomicity of any memory allocations
1971 * Prepare a new set of credentials for modification.
1973 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1976 struct task_smack
*old_tsp
= old
->security
;
1977 struct task_smack
*new_tsp
;
1980 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1981 if (new_tsp
== NULL
)
1984 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1988 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
1993 new->security
= new_tsp
;
1998 * smack_cred_transfer - Transfer the old credentials to the new credentials
1999 * @new: the new credentials
2000 * @old: the original credentials
2002 * Fill in a set of blank credentials from another set of credentials.
2004 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2006 struct task_smack
*old_tsp
= old
->security
;
2007 struct task_smack
*new_tsp
= new->security
;
2009 new_tsp
->smk_task
= old_tsp
->smk_task
;
2010 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2011 mutex_init(&new_tsp
->smk_rules_lock
);
2012 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2015 /* cbs copy rule list */
2019 * smack_kernel_act_as - Set the subjective context in a set of credentials
2020 * @new: points to the set of credentials to be modified.
2021 * @secid: specifies the security ID to be set
2023 * Set the security data for a kernel service.
2025 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2027 struct task_smack
*new_tsp
= new->security
;
2028 struct smack_known
*skp
= smack_from_secid(secid
);
2033 new_tsp
->smk_task
= skp
;
2038 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2039 * @new: points to the set of credentials to be modified
2040 * @inode: points to the inode to use as a reference
2042 * Set the file creation context in a set of credentials to the same
2043 * as the objective context of the specified inode
2045 static int smack_kernel_create_files_as(struct cred
*new,
2046 struct inode
*inode
)
2048 struct inode_smack
*isp
= inode
->i_security
;
2049 struct task_smack
*tsp
= new->security
;
2051 tsp
->smk_forked
= isp
->smk_inode
;
2052 tsp
->smk_task
= tsp
->smk_forked
;
2057 * smk_curacc_on_task - helper to log task related access
2058 * @p: the task object
2059 * @access: the access requested
2060 * @caller: name of the calling function for audit
2062 * Return 0 if access is permitted
2064 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2067 struct smk_audit_info ad
;
2068 struct smack_known
*skp
= smk_of_task_struct(p
);
2071 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2072 smk_ad_setfield_u_tsk(&ad
, p
);
2073 rc
= smk_curacc(skp
, access
, &ad
);
2074 rc
= smk_bu_task(p
, access
, rc
);
2079 * smack_task_setpgid - Smack check on setting pgid
2080 * @p: the task object
2083 * Return 0 if write access is permitted
2085 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2087 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2091 * smack_task_getpgid - Smack access check for getpgid
2092 * @p: the object task
2094 * Returns 0 if current can read the object task, error code otherwise
2096 static int smack_task_getpgid(struct task_struct
*p
)
2098 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2102 * smack_task_getsid - Smack access check for getsid
2103 * @p: the object task
2105 * Returns 0 if current can read the object task, error code otherwise
2107 static int smack_task_getsid(struct task_struct
*p
)
2109 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2113 * smack_task_getsecid - get the secid of the task
2114 * @p: the object task
2115 * @secid: where to put the result
2117 * Sets the secid to contain a u32 version of the smack label.
2119 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2121 struct smack_known
*skp
= smk_of_task_struct(p
);
2123 *secid
= skp
->smk_secid
;
2127 * smack_task_setnice - Smack check on setting nice
2128 * @p: the task object
2131 * Return 0 if write access is permitted
2133 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2135 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2139 * smack_task_setioprio - Smack check on setting ioprio
2140 * @p: the task object
2143 * Return 0 if write access is permitted
2145 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2147 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2151 * smack_task_getioprio - Smack check on reading ioprio
2152 * @p: the task object
2154 * Return 0 if read access is permitted
2156 static int smack_task_getioprio(struct task_struct
*p
)
2158 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2162 * smack_task_setscheduler - Smack check on setting scheduler
2163 * @p: the task object
2167 * Return 0 if read access is permitted
2169 static int smack_task_setscheduler(struct task_struct
*p
)
2171 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2175 * smack_task_getscheduler - Smack check on reading scheduler
2176 * @p: the task object
2178 * Return 0 if read access is permitted
2180 static int smack_task_getscheduler(struct task_struct
*p
)
2182 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2186 * smack_task_movememory - Smack check on moving memory
2187 * @p: the task object
2189 * Return 0 if write access is permitted
2191 static int smack_task_movememory(struct task_struct
*p
)
2193 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2197 * smack_task_kill - Smack check on signal delivery
2198 * @p: the task object
2201 * @secid: identifies the smack to use in lieu of current's
2203 * Return 0 if write access is permitted
2205 * The secid behavior is an artifact of an SELinux hack
2206 * in the USB code. Someday it may go away.
2208 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2211 struct smk_audit_info ad
;
2212 struct smack_known
*skp
;
2213 struct smack_known
*tkp
= smk_of_task_struct(p
);
2216 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2217 smk_ad_setfield_u_tsk(&ad
, p
);
2219 * Sending a signal requires that the sender
2220 * can write the receiver.
2223 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
2224 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2228 * If the secid isn't 0 we're dealing with some USB IO
2229 * specific behavior. This is not clean. For one thing
2230 * we can't take privilege into account.
2232 skp
= smack_from_secid(secid
);
2233 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2234 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2239 * smack_task_wait - Smack access check for waiting
2240 * @p: task to wait for
2244 static int smack_task_wait(struct task_struct
*p
)
2247 * Allow the operation to succeed.
2249 * In userless environments (e.g. phones) programs
2250 * get marked with SMACK64EXEC and even if the parent
2251 * and child shouldn't be talking the parent still
2252 * may expect to know when the child exits.
2258 * smack_task_to_inode - copy task smack into the inode blob
2259 * @p: task to copy from
2260 * @inode: inode to copy to
2262 * Sets the smack pointer in the inode security blob
2264 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2266 struct inode_smack
*isp
= inode
->i_security
;
2267 struct smack_known
*skp
= smk_of_task_struct(p
);
2269 isp
->smk_inode
= skp
;
2277 * smack_sk_alloc_security - Allocate a socket blob
2280 * @gfp_flags: memory allocation flags
2282 * Assign Smack pointers to current
2284 * Returns 0 on success, -ENOMEM is there's no memory
2286 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2288 struct smack_known
*skp
= smk_of_current();
2289 struct socket_smack
*ssp
;
2291 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2297 ssp
->smk_packet
= NULL
;
2299 sk
->sk_security
= ssp
;
2305 * smack_sk_free_security - Free a socket blob
2308 * Clears the blob pointer
2310 static void smack_sk_free_security(struct sock
*sk
)
2312 kfree(sk
->sk_security
);
2316 * smack_ipv4host_label - check host based restrictions
2317 * @sip: the object end
2319 * looks for host based access restrictions
2321 * This version will only be appropriate for really small sets of single label
2322 * hosts. The caller is responsible for ensuring that the RCU read lock is
2323 * taken before calling this function.
2325 * Returns the label of the far end or NULL if it's not special.
2327 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2329 struct smk_net4addr
*snp
;
2330 struct in_addr
*siap
= &sip
->sin_addr
;
2332 if (siap
->s_addr
== 0)
2335 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2337 * we break after finding the first match because
2338 * the list is sorted from longest to shortest mask
2339 * so we have found the most specific match
2341 if (snp
->smk_host
.s_addr
==
2342 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2343 return snp
->smk_label
;
2348 #if IS_ENABLED(CONFIG_IPV6)
2350 * smk_ipv6_localhost - Check for local ipv6 host address
2353 * Returns boolean true if this is the localhost address
2355 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2357 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2358 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2360 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2361 ntohs(be16p
[7]) == 1)
2367 * smack_ipv6host_label - check host based restrictions
2368 * @sip: the object end
2370 * looks for host based access restrictions
2372 * This version will only be appropriate for really small sets of single label
2373 * hosts. The caller is responsible for ensuring that the RCU read lock is
2374 * taken before calling this function.
2376 * Returns the label of the far end or NULL if it's not special.
2378 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2380 struct smk_net6addr
*snp
;
2381 struct in6_addr
*sap
= &sip
->sin6_addr
;
2386 * It's local. Don't look for a host label.
2388 if (smk_ipv6_localhost(sip
))
2391 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2393 * we break after finding the first match because
2394 * the list is sorted from longest to shortest mask
2395 * so we have found the most specific match
2397 for (found
= 1, i
= 0; i
< 8; i
++) {
2399 * If the label is NULL the entry has
2400 * been renounced. Ignore it.
2402 if (snp
->smk_label
== NULL
)
2404 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2405 snp
->smk_host
.s6_addr16
[i
]) {
2411 return snp
->smk_label
;
2416 #endif /* CONFIG_IPV6 */
2419 * smack_netlabel - Set the secattr on a socket
2421 * @labeled: socket label scheme
2423 * Convert the outbound smack value (smk_out) to a
2424 * secattr and attach it to the socket.
2426 * Returns 0 on success or an error code
2428 static int smack_netlabel(struct sock
*sk
, int labeled
)
2430 struct smack_known
*skp
;
2431 struct socket_smack
*ssp
= sk
->sk_security
;
2435 * Usually the netlabel code will handle changing the
2436 * packet labeling based on the label.
2437 * The case of a single label host is different, because
2438 * a single label host should never get a labeled packet
2439 * even though the label is usually associated with a packet
2443 bh_lock_sock_nested(sk
);
2445 if (ssp
->smk_out
== smack_net_ambient
||
2446 labeled
== SMACK_UNLABELED_SOCKET
)
2447 netlbl_sock_delattr(sk
);
2450 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2460 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2462 * @sap: the destination address
2464 * Set the correct secattr for the given socket based on the destination
2465 * address and perform any outbound access checks needed.
2467 * Returns 0 on success or an error code.
2470 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2472 struct smack_known
*skp
;
2475 struct smack_known
*hkp
;
2476 struct socket_smack
*ssp
= sk
->sk_security
;
2477 struct smk_audit_info ad
;
2480 hkp
= smack_ipv4host_label(sap
);
2483 struct lsm_network_audit net
;
2485 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2486 ad
.a
.u
.net
->family
= sap
->sin_family
;
2487 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2488 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2490 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2492 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2493 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2495 sk_lbl
= SMACK_CIPSO_SOCKET
;
2502 return smack_netlabel(sk
, sk_lbl
);
2505 #if IS_ENABLED(CONFIG_IPV6)
2507 * smk_ipv6_check - check Smack access
2508 * @subject: subject Smack label
2509 * @object: object Smack label
2511 * @act: the action being taken
2513 * Check an IPv6 access
2515 static int smk_ipv6_check(struct smack_known
*subject
,
2516 struct smack_known
*object
,
2517 struct sockaddr_in6
*address
, int act
)
2520 struct lsm_network_audit net
;
2522 struct smk_audit_info ad
;
2526 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2527 ad
.a
.u
.net
->family
= PF_INET6
;
2528 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2529 if (act
== SMK_RECEIVING
)
2530 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2532 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2534 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2535 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2538 #endif /* CONFIG_IPV6 */
2540 #ifdef SMACK_IPV6_PORT_LABELING
2542 * smk_ipv6_port_label - Smack port access table management
2546 * Create or update the port list entry
2548 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2550 struct sock
*sk
= sock
->sk
;
2551 struct sockaddr_in6
*addr6
;
2552 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2553 struct smk_port_label
*spp
;
2554 unsigned short port
= 0;
2556 if (address
== NULL
) {
2558 * This operation is changing the Smack information
2559 * on the bound socket. Take the changes to the port
2562 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2563 if (sk
!= spp
->smk_sock
)
2565 spp
->smk_in
= ssp
->smk_in
;
2566 spp
->smk_out
= ssp
->smk_out
;
2570 * A NULL address is only used for updating existing
2571 * bound entries. If there isn't one, it's OK.
2576 addr6
= (struct sockaddr_in6
*)address
;
2577 port
= ntohs(addr6
->sin6_port
);
2579 * This is a special case that is safely ignored.
2585 * Look for an existing port list entry.
2586 * This is an indication that a port is getting reused.
2588 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2589 if (spp
->smk_port
!= port
)
2591 spp
->smk_port
= port
;
2593 spp
->smk_in
= ssp
->smk_in
;
2594 spp
->smk_out
= ssp
->smk_out
;
2599 * A new port entry is required.
2601 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2605 spp
->smk_port
= port
;
2607 spp
->smk_in
= ssp
->smk_in
;
2608 spp
->smk_out
= ssp
->smk_out
;
2610 list_add(&spp
->list
, &smk_ipv6_port_list
);
2615 * smk_ipv6_port_check - check Smack port access
2619 * Create or update the port list entry
2621 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2624 struct smk_port_label
*spp
;
2625 struct socket_smack
*ssp
= sk
->sk_security
;
2626 struct smack_known
*skp
= NULL
;
2627 unsigned short port
;
2628 struct smack_known
*object
;
2630 if (act
== SMK_RECEIVING
) {
2631 skp
= smack_ipv6host_label(address
);
2632 object
= ssp
->smk_in
;
2635 object
= smack_ipv6host_label(address
);
2639 * The other end is a single label host.
2641 if (skp
!= NULL
&& object
!= NULL
)
2642 return smk_ipv6_check(skp
, object
, address
, act
);
2644 skp
= smack_net_ambient
;
2646 object
= smack_net_ambient
;
2649 * It's remote, so port lookup does no good.
2651 if (!smk_ipv6_localhost(address
))
2652 return smk_ipv6_check(skp
, object
, address
, act
);
2655 * It's local so the send check has to have passed.
2657 if (act
== SMK_RECEIVING
)
2660 port
= ntohs(address
->sin6_port
);
2661 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2662 if (spp
->smk_port
!= port
)
2664 object
= spp
->smk_in
;
2665 if (act
== SMK_CONNECTING
)
2666 ssp
->smk_packet
= spp
->smk_out
;
2670 return smk_ipv6_check(skp
, object
, address
, act
);
2672 #endif /* SMACK_IPV6_PORT_LABELING */
2675 * smack_inode_setsecurity - set smack xattrs
2676 * @inode: the object
2677 * @name: attribute name
2678 * @value: attribute value
2679 * @size: size of the attribute
2682 * Sets the named attribute in the appropriate blob
2684 * Returns 0 on success, or an error code
2686 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2687 const void *value
, size_t size
, int flags
)
2689 struct smack_known
*skp
;
2690 struct inode_smack
*nsp
= inode
->i_security
;
2691 struct socket_smack
*ssp
;
2692 struct socket
*sock
;
2695 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2698 skp
= smk_import_entry(value
, size
);
2700 return PTR_ERR(skp
);
2702 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2703 nsp
->smk_inode
= skp
;
2704 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2708 * The rest of the Smack xattrs are only on sockets.
2710 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2713 sock
= SOCKET_I(inode
);
2714 if (sock
== NULL
|| sock
->sk
== NULL
)
2717 ssp
= sock
->sk
->sk_security
;
2719 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2721 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2723 if (sock
->sk
->sk_family
== PF_INET
) {
2724 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2727 "Smack: \"%s\" netlbl error %d.\n",
2733 #ifdef SMACK_IPV6_PORT_LABELING
2734 if (sock
->sk
->sk_family
== PF_INET6
)
2735 smk_ipv6_port_label(sock
, NULL
);
2742 * smack_socket_post_create - finish socket setup
2744 * @family: protocol family
2749 * Sets the netlabel information on the socket
2751 * Returns 0 on success, and error code otherwise
2753 static int smack_socket_post_create(struct socket
*sock
, int family
,
2754 int type
, int protocol
, int kern
)
2756 struct socket_smack
*ssp
;
2758 if (sock
->sk
== NULL
)
2762 * Sockets created by kernel threads receive web label.
2764 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2765 ssp
= sock
->sk
->sk_security
;
2766 ssp
->smk_in
= &smack_known_web
;
2767 ssp
->smk_out
= &smack_known_web
;
2770 if (family
!= PF_INET
)
2773 * Set the outbound netlbl.
2775 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2778 #ifdef SMACK_IPV6_PORT_LABELING
2780 * smack_socket_bind - record port binding information.
2782 * @address: the port address
2783 * @addrlen: size of the address
2785 * Records the label bound to a port.
2789 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2792 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2793 smk_ipv6_port_label(sock
, address
);
2796 #endif /* SMACK_IPV6_PORT_LABELING */
2799 * smack_socket_connect - connect access check
2801 * @sap: the other end
2802 * @addrlen: size of sap
2804 * Verifies that a connection may be possible
2806 * Returns 0 on success, and error code otherwise
2808 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2812 #if IS_ENABLED(CONFIG_IPV6)
2813 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2815 #ifdef SMACK_IPV6_SECMARK_LABELING
2816 struct smack_known
*rsp
;
2817 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2820 if (sock
->sk
== NULL
)
2823 switch (sock
->sk
->sk_family
) {
2825 if (addrlen
< sizeof(struct sockaddr_in
))
2827 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2830 if (addrlen
< sizeof(struct sockaddr_in6
))
2832 #ifdef SMACK_IPV6_SECMARK_LABELING
2833 rsp
= smack_ipv6host_label(sip
);
2835 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2838 #ifdef SMACK_IPV6_PORT_LABELING
2839 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2847 * smack_flags_to_may - convert S_ to MAY_ values
2848 * @flags: the S_ value
2850 * Returns the equivalent MAY_ value
2852 static int smack_flags_to_may(int flags
)
2856 if (flags
& S_IRUGO
)
2858 if (flags
& S_IWUGO
)
2860 if (flags
& S_IXUGO
)
2867 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2872 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2874 struct smack_known
*skp
= smk_of_current();
2876 msg
->security
= skp
;
2881 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2884 * Clears the blob pointer
2886 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2888 msg
->security
= NULL
;
2892 * smack_of_shm - the smack pointer for the shm
2895 * Returns a pointer to the smack value
2897 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2899 return (struct smack_known
*)shp
->shm_perm
.security
;
2903 * smack_shm_alloc_security - Set the security blob for shm
2908 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2910 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2911 struct smack_known
*skp
= smk_of_current();
2913 isp
->security
= skp
;
2918 * smack_shm_free_security - Clear the security blob for shm
2921 * Clears the blob pointer
2923 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2925 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2927 isp
->security
= NULL
;
2931 * smk_curacc_shm : check if current has access on shm
2933 * @access : access requested
2935 * Returns 0 if current has the requested access, error code otherwise
2937 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2939 struct smack_known
*ssp
= smack_of_shm(shp
);
2940 struct smk_audit_info ad
;
2944 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2945 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2947 rc
= smk_curacc(ssp
, access
, &ad
);
2948 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2953 * smack_shm_associate - Smack access check for shm
2955 * @shmflg: access requested
2957 * Returns 0 if current has the requested access, error code otherwise
2959 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2963 may
= smack_flags_to_may(shmflg
);
2964 return smk_curacc_shm(shp
, may
);
2968 * smack_shm_shmctl - Smack access check for shm
2970 * @cmd: what it wants to do
2972 * Returns 0 if current has the requested access, error code otherwise
2974 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2987 may
= MAY_READWRITE
;
2992 * System level information.
2998 return smk_curacc_shm(shp
, may
);
3002 * smack_shm_shmat - Smack access for shmat
3005 * @shmflg: access requested
3007 * Returns 0 if current has the requested access, error code otherwise
3009 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
3014 may
= smack_flags_to_may(shmflg
);
3015 return smk_curacc_shm(shp
, may
);
3019 * smack_of_sem - the smack pointer for the sem
3022 * Returns a pointer to the smack value
3024 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
3026 return (struct smack_known
*)sma
->sem_perm
.security
;
3030 * smack_sem_alloc_security - Set the security blob for sem
3035 static int smack_sem_alloc_security(struct sem_array
*sma
)
3037 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3038 struct smack_known
*skp
= smk_of_current();
3040 isp
->security
= skp
;
3045 * smack_sem_free_security - Clear the security blob for sem
3048 * Clears the blob pointer
3050 static void smack_sem_free_security(struct sem_array
*sma
)
3052 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3054 isp
->security
= NULL
;
3058 * smk_curacc_sem : check if current has access on sem
3060 * @access : access requested
3062 * Returns 0 if current has the requested access, error code otherwise
3064 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3066 struct smack_known
*ssp
= smack_of_sem(sma
);
3067 struct smk_audit_info ad
;
3071 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3072 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3074 rc
= smk_curacc(ssp
, access
, &ad
);
3075 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3080 * smack_sem_associate - Smack access check for sem
3082 * @semflg: access requested
3084 * Returns 0 if current has the requested access, error code otherwise
3086 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3090 may
= smack_flags_to_may(semflg
);
3091 return smk_curacc_sem(sma
, may
);
3095 * smack_sem_shmctl - Smack access check for sem
3097 * @cmd: what it wants to do
3099 * Returns 0 if current has the requested access, error code otherwise
3101 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3119 may
= MAY_READWRITE
;
3124 * System level information
3131 return smk_curacc_sem(sma
, may
);
3135 * smack_sem_semop - Smack checks of semaphore operations
3141 * Treated as read and write in all cases.
3143 * Returns 0 if access is allowed, error code otherwise
3145 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3146 unsigned nsops
, int alter
)
3148 return smk_curacc_sem(sma
, MAY_READWRITE
);
3152 * smack_msg_alloc_security - Set the security blob for msg
3157 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3159 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3160 struct smack_known
*skp
= smk_of_current();
3162 kisp
->security
= skp
;
3167 * smack_msg_free_security - Clear the security blob for msg
3170 * Clears the blob pointer
3172 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3174 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3176 kisp
->security
= NULL
;
3180 * smack_of_msq - the smack pointer for the msq
3183 * Returns a pointer to the smack label entry
3185 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3187 return (struct smack_known
*)msq
->q_perm
.security
;
3191 * smk_curacc_msq : helper to check if current has access on msq
3193 * @access : access requested
3195 * return 0 if current has access, error otherwise
3197 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3199 struct smack_known
*msp
= smack_of_msq(msq
);
3200 struct smk_audit_info ad
;
3204 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3205 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3207 rc
= smk_curacc(msp
, access
, &ad
);
3208 rc
= smk_bu_current("msq", msp
, access
, rc
);
3213 * smack_msg_queue_associate - Smack access check for msg_queue
3215 * @msqflg: access requested
3217 * Returns 0 if current has the requested access, error code otherwise
3219 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3223 may
= smack_flags_to_may(msqflg
);
3224 return smk_curacc_msq(msq
, may
);
3228 * smack_msg_queue_msgctl - Smack access check for msg_queue
3230 * @cmd: what it wants to do
3232 * Returns 0 if current has the requested access, error code otherwise
3234 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3245 may
= MAY_READWRITE
;
3250 * System level information
3257 return smk_curacc_msq(msq
, may
);
3261 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3264 * @msqflg: access requested
3266 * Returns 0 if current has the requested access, error code otherwise
3268 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3273 may
= smack_flags_to_may(msqflg
);
3274 return smk_curacc_msq(msq
, may
);
3278 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3285 * Returns 0 if current has read and write access, error code otherwise
3287 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3288 struct task_struct
*target
, long type
, int mode
)
3290 return smk_curacc_msq(msq
, MAY_READWRITE
);
3294 * smack_ipc_permission - Smack access for ipc_permission()
3295 * @ipp: the object permissions
3296 * @flag: access requested
3298 * Returns 0 if current has read and write access, error code otherwise
3300 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3302 struct smack_known
*iskp
= ipp
->security
;
3303 int may
= smack_flags_to_may(flag
);
3304 struct smk_audit_info ad
;
3308 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3309 ad
.a
.u
.ipc_id
= ipp
->id
;
3311 rc
= smk_curacc(iskp
, may
, &ad
);
3312 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3317 * smack_ipc_getsecid - Extract smack security id
3318 * @ipp: the object permissions
3319 * @secid: where result will be saved
3321 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3323 struct smack_known
*iskp
= ipp
->security
;
3325 *secid
= iskp
->smk_secid
;
3329 * smack_d_instantiate - Make sure the blob is correct on an inode
3330 * @opt_dentry: dentry where inode will be attached
3331 * @inode: the object
3333 * Set the inode's security blob if it hasn't been done already.
3335 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3337 struct super_block
*sbp
;
3338 struct superblock_smack
*sbsp
;
3339 struct inode_smack
*isp
;
3340 struct smack_known
*skp
;
3341 struct smack_known
*ckp
= smk_of_current();
3342 struct smack_known
*final
;
3343 char trattr
[TRANS_TRUE_SIZE
];
3351 isp
= inode
->i_security
;
3353 mutex_lock(&isp
->smk_lock
);
3355 * If the inode is already instantiated
3356 * take the quick way out
3358 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3362 sbsp
= sbp
->s_security
;
3364 * We're going to use the superblock default label
3365 * if there's no label on the file.
3367 final
= sbsp
->smk_default
;
3370 * If this is the root inode the superblock
3371 * may be in the process of initialization.
3372 * If that is the case use the root value out
3373 * of the superblock.
3375 if (opt_dentry
->d_parent
== opt_dentry
) {
3376 switch (sbp
->s_magic
) {
3377 case CGROUP_SUPER_MAGIC
:
3379 * The cgroup filesystem is never mounted,
3380 * so there's no opportunity to set the mount
3383 sbsp
->smk_root
= &smack_known_star
;
3384 sbsp
->smk_default
= &smack_known_star
;
3385 isp
->smk_inode
= sbsp
->smk_root
;
3389 * What about shmem/tmpfs anonymous files with dentry
3390 * obtained from d_alloc_pseudo()?
3392 isp
->smk_inode
= smk_of_current();
3395 isp
->smk_inode
= smk_of_current();
3398 isp
->smk_inode
= sbsp
->smk_root
;
3401 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3406 * This is pretty hackish.
3407 * Casey says that we shouldn't have to do
3408 * file system specific code, but it does help
3409 * with keeping it simple.
3411 switch (sbp
->s_magic
) {
3415 case CGROUP_SUPER_MAGIC
:
3417 * Casey says that it's a little embarrassing
3418 * that the smack file system doesn't do
3419 * extended attributes.
3421 * Casey says pipes are easy (?)
3423 * Socket access is controlled by the socket
3424 * structures associated with the task involved.
3426 * Cgroupfs is special
3428 final
= &smack_known_star
;
3430 case DEVPTS_SUPER_MAGIC
:
3432 * devpts seems content with the label of the task.
3433 * Programs that change smack have to treat the
3438 case PROC_SUPER_MAGIC
:
3440 * Casey says procfs appears not to care.
3441 * The superblock default suffices.
3446 * Device labels should come from the filesystem,
3447 * but watch out, because they're volitile,
3448 * getting recreated on every reboot.
3450 final
= &smack_known_star
;
3454 * If a smack value has been set we want to use it,
3455 * but since tmpfs isn't giving us the opportunity
3456 * to set mount options simulate setting the
3457 * superblock default.
3461 * This isn't an understood special case.
3462 * Get the value from the xattr.
3466 * UNIX domain sockets use lower level socket data.
3468 if (S_ISSOCK(inode
->i_mode
)) {
3469 final
= &smack_known_star
;
3473 * No xattr support means, alas, no SMACK label.
3474 * Use the aforeapplied default.
3475 * It would be curious if the label of the task
3476 * does not match that assigned.
3478 if (inode
->i_op
->getxattr
== NULL
)
3481 * Get the dentry for xattr.
3483 dp
= dget(opt_dentry
);
3484 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3485 if (!IS_ERR_OR_NULL(skp
))
3489 * Transmuting directory
3491 if (S_ISDIR(inode
->i_mode
)) {
3493 * If this is a new directory and the label was
3494 * transmuted when the inode was initialized
3495 * set the transmute attribute on the directory
3496 * and mark the inode.
3498 * If there is a transmute attribute on the
3499 * directory mark the inode.
3501 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3502 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3503 rc
= inode
->i_op
->setxattr(dp
,
3504 XATTR_NAME_SMACKTRANSMUTE
,
3505 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3508 rc
= inode
->i_op
->getxattr(dp
,
3509 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3511 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3512 TRANS_TRUE_SIZE
) != 0)
3516 transflag
= SMK_INODE_TRANSMUTE
;
3519 * Don't let the exec or mmap label be "*" or "@".
3521 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3522 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3523 skp
== &smack_known_web
)
3525 isp
->smk_task
= skp
;
3527 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3528 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3529 skp
== &smack_known_web
)
3531 isp
->smk_mmap
= skp
;
3538 isp
->smk_inode
= ckp
;
3540 isp
->smk_inode
= final
;
3542 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3545 mutex_unlock(&isp
->smk_lock
);
3550 * smack_getprocattr - Smack process attribute access
3551 * @p: the object task
3552 * @name: the name of the attribute in /proc/.../attr
3553 * @value: where to put the result
3555 * Places a copy of the task Smack into value
3557 * Returns the length of the smack label or an error code
3559 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3561 struct smack_known
*skp
= smk_of_task_struct(p
);
3565 if (strcmp(name
, "current") != 0)
3568 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3578 * smack_setprocattr - Smack process attribute setting
3579 * @p: the object task
3580 * @name: the name of the attribute in /proc/.../attr
3581 * @value: the value to set
3582 * @size: the size of the value
3584 * Sets the Smack value of the task. Only setting self
3585 * is permitted and only with privilege
3587 * Returns the length of the smack label or an error code
3589 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3590 void *value
, size_t size
)
3592 struct task_smack
*tsp
= current_security();
3594 struct smack_known
*skp
;
3595 struct smack_known_list_elem
*sklep
;
3599 * Changing another process' Smack value is too dangerous
3600 * and supports no sane use case.
3605 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3608 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3611 if (strcmp(name
, "current") != 0)
3614 skp
= smk_import_entry(value
, size
);
3616 return PTR_ERR(skp
);
3619 * No process is ever allowed the web ("@") label.
3621 if (skp
== &smack_known_web
)
3624 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3626 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3627 if (sklep
->smk_label
== skp
) {
3635 new = prepare_creds();
3639 tsp
= new->security
;
3640 tsp
->smk_task
= skp
;
3642 * process can change its label only once
3644 smk_destroy_label_list(&tsp
->smk_relabel
);
3651 * smack_unix_stream_connect - Smack access on UDS
3653 * @other: the other sock
3656 * Return 0 if a subject with the smack of sock could access
3657 * an object with the smack of other, otherwise an error code
3659 static int smack_unix_stream_connect(struct sock
*sock
,
3660 struct sock
*other
, struct sock
*newsk
)
3662 struct smack_known
*skp
;
3663 struct smack_known
*okp
;
3664 struct socket_smack
*ssp
= sock
->sk_security
;
3665 struct socket_smack
*osp
= other
->sk_security
;
3666 struct socket_smack
*nsp
= newsk
->sk_security
;
3667 struct smk_audit_info ad
;
3670 struct lsm_network_audit net
;
3673 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3677 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3678 smk_ad_setfield_u_net_sk(&ad
, other
);
3680 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3681 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3685 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3686 rc
= smk_bu_note("UDS connect", okp
, skp
,
3692 * Cross reference the peer labels for SO_PEERSEC.
3695 nsp
->smk_packet
= ssp
->smk_out
;
3696 ssp
->smk_packet
= osp
->smk_out
;
3703 * smack_unix_may_send - Smack access on UDS
3705 * @other: the other socket
3707 * Return 0 if a subject with the smack of sock could access
3708 * an object with the smack of other, otherwise an error code
3710 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3712 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3713 struct socket_smack
*osp
= other
->sk
->sk_security
;
3714 struct smk_audit_info ad
;
3718 struct lsm_network_audit net
;
3720 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3721 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3724 if (smack_privileged(CAP_MAC_OVERRIDE
))
3727 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3728 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3733 * smack_socket_sendmsg - Smack check based on destination host
3736 * @size: the size of the message
3738 * Return 0 if the current subject can write to the destination host.
3739 * For IPv4 this is only a question if the destination is a single label host.
3740 * For IPv6 this is a check against the label of the port.
3742 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3745 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3746 #if IS_ENABLED(CONFIG_IPV6)
3747 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3749 #ifdef SMACK_IPV6_SECMARK_LABELING
3750 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3751 struct smack_known
*rsp
;
3756 * Perfectly reasonable for this to be NULL
3761 switch (sip
->sin_family
) {
3763 rc
= smack_netlabel_send(sock
->sk
, sip
);
3766 #ifdef SMACK_IPV6_SECMARK_LABELING
3767 rsp
= smack_ipv6host_label(sap
);
3769 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3772 #ifdef SMACK_IPV6_PORT_LABELING
3773 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3781 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3782 * @sap: netlabel secattr
3783 * @ssp: socket security information
3785 * Returns a pointer to a Smack label entry found on the label list.
3787 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3788 struct socket_smack
*ssp
)
3790 struct smack_known
*skp
;
3795 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3797 * Looks like a CIPSO packet.
3798 * If there are flags but no level netlabel isn't
3799 * behaving the way we expect it to.
3801 * Look it up in the label table
3802 * Without guidance regarding the smack value
3803 * for the packet fall back on the network
3807 list_for_each_entry(skp
, &smack_known_list
, list
) {
3808 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3811 * Compare the catsets. Use the netlbl APIs.
3813 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3814 if ((skp
->smk_netlabel
.flags
&
3815 NETLBL_SECATTR_MLS_CAT
) == 0)
3819 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3820 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3822 kcat
= netlbl_catmap_walk(
3823 skp
->smk_netlabel
.attr
.mls
.cat
,
3825 if (acat
< 0 || kcat
< 0)
3838 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3839 return &smack_known_web
;
3840 return &smack_known_star
;
3842 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3844 * Looks like a fallback, which gives us a secid.
3846 skp
= smack_from_secid(sap
->attr
.secid
);
3848 * This has got to be a bug because it is
3849 * impossible to specify a fallback without
3850 * specifying the label, which will ensure
3851 * it has a secid, and the only way to get a
3852 * secid is from a fallback.
3854 BUG_ON(skp
== NULL
);
3858 * Without guidance regarding the smack value
3859 * for the packet fall back on the network
3862 return smack_net_ambient
;
3865 #if IS_ENABLED(CONFIG_IPV6)
3866 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3870 int proto
= -EINVAL
;
3871 struct ipv6hdr _ipv6h
;
3872 struct ipv6hdr
*ip6
;
3874 struct tcphdr _tcph
, *th
;
3875 struct udphdr _udph
, *uh
;
3876 struct dccp_hdr _dccph
, *dh
;
3880 offset
= skb_network_offset(skb
);
3881 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3884 sip
->sin6_addr
= ip6
->saddr
;
3886 nexthdr
= ip6
->nexthdr
;
3887 offset
+= sizeof(_ipv6h
);
3888 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3895 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3897 sip
->sin6_port
= th
->source
;
3900 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3902 sip
->sin6_port
= uh
->source
;
3905 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3907 sip
->sin6_port
= dh
->dccph_sport
;
3912 #endif /* CONFIG_IPV6 */
3915 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3919 * Returns 0 if the packet should be delivered, an error code otherwise
3921 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3923 struct netlbl_lsm_secattr secattr
;
3924 struct socket_smack
*ssp
= sk
->sk_security
;
3925 struct smack_known
*skp
= NULL
;
3927 struct smk_audit_info ad
;
3929 struct lsm_network_audit net
;
3931 #if IS_ENABLED(CONFIG_IPV6)
3932 struct sockaddr_in6 sadd
;
3934 #endif /* CONFIG_IPV6 */
3936 switch (sk
->sk_family
) {
3938 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3940 * If there is a secmark use it rather than the CIPSO label.
3941 * If there is no secmark fall back to CIPSO.
3942 * The secmark is assumed to reflect policy better.
3944 if (skb
&& skb
->secmark
!= 0) {
3945 skp
= smack_from_secid(skb
->secmark
);
3948 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3950 * Translate what netlabel gave us.
3952 netlbl_secattr_init(&secattr
);
3954 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3956 skp
= smack_from_secattr(&secattr
, ssp
);
3958 skp
= smack_net_ambient
;
3960 netlbl_secattr_destroy(&secattr
);
3962 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3966 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3967 ad
.a
.u
.net
->family
= sk
->sk_family
;
3968 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3969 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3972 * Receiving a packet requires that the other end
3973 * be able to write here. Read access is not required.
3974 * This is the simplist possible security model
3977 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3978 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3981 netlbl_skbuff_err(skb
, rc
, 0);
3983 #if IS_ENABLED(CONFIG_IPV6)
3985 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3986 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
3988 #ifdef SMACK_IPV6_SECMARK_LABELING
3989 if (skb
&& skb
->secmark
!= 0)
3990 skp
= smack_from_secid(skb
->secmark
);
3992 skp
= smack_ipv6host_label(&sadd
);
3994 skp
= smack_net_ambient
;
3996 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3997 ad
.a
.u
.net
->family
= sk
->sk_family
;
3998 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3999 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4000 #endif /* CONFIG_AUDIT */
4001 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4002 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4004 #endif /* SMACK_IPV6_SECMARK_LABELING */
4005 #ifdef SMACK_IPV6_PORT_LABELING
4006 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4007 #endif /* SMACK_IPV6_PORT_LABELING */
4009 #endif /* CONFIG_IPV6 */
4016 * smack_socket_getpeersec_stream - pull in packet label
4018 * @optval: user's destination
4019 * @optlen: size thereof
4022 * returns zero on success, an error code otherwise
4024 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4025 char __user
*optval
,
4026 int __user
*optlen
, unsigned len
)
4028 struct socket_smack
*ssp
;
4033 ssp
= sock
->sk
->sk_security
;
4034 if (ssp
->smk_packet
!= NULL
) {
4035 rcp
= ssp
->smk_packet
->smk_known
;
4036 slen
= strlen(rcp
) + 1;
4041 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4044 if (put_user(slen
, optlen
) != 0)
4052 * smack_socket_getpeersec_dgram - pull in packet label
4053 * @sock: the peer socket
4055 * @secid: pointer to where to put the secid of the packet
4057 * Sets the netlabel socket state on sk from parent
4059 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4060 struct sk_buff
*skb
, u32
*secid
)
4063 struct netlbl_lsm_secattr secattr
;
4064 struct socket_smack
*ssp
= NULL
;
4065 struct smack_known
*skp
;
4066 int family
= PF_UNSPEC
;
4067 u32 s
= 0; /* 0 is the invalid secid */
4071 if (skb
->protocol
== htons(ETH_P_IP
))
4073 #if IS_ENABLED(CONFIG_IPV6)
4074 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4076 #endif /* CONFIG_IPV6 */
4078 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4079 family
= sock
->sk
->sk_family
;
4083 ssp
= sock
->sk
->sk_security
;
4084 s
= ssp
->smk_out
->smk_secid
;
4087 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4093 * Translate what netlabel gave us.
4095 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4096 ssp
= sock
->sk
->sk_security
;
4097 netlbl_secattr_init(&secattr
);
4098 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4100 skp
= smack_from_secattr(&secattr
, ssp
);
4103 netlbl_secattr_destroy(&secattr
);
4106 #ifdef SMACK_IPV6_SECMARK_LABELING
4118 * smack_sock_graft - Initialize a newly created socket with an existing sock
4120 * @parent: parent socket
4122 * Set the smk_{in,out} state of an existing sock based on the process that
4123 * is creating the new socket.
4125 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4127 struct socket_smack
*ssp
;
4128 struct smack_known
*skp
= smk_of_current();
4131 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4134 ssp
= sk
->sk_security
;
4137 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4141 * smack_inet_conn_request - Smack access check on connect
4142 * @sk: socket involved
4146 * Returns 0 if a task with the packet label could write to
4147 * the socket, otherwise an error code
4149 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4150 struct request_sock
*req
)
4152 u16 family
= sk
->sk_family
;
4153 struct smack_known
*skp
;
4154 struct socket_smack
*ssp
= sk
->sk_security
;
4155 struct netlbl_lsm_secattr secattr
;
4156 struct sockaddr_in addr
;
4158 struct smack_known
*hskp
;
4160 struct smk_audit_info ad
;
4162 struct lsm_network_audit net
;
4165 #if IS_ENABLED(CONFIG_IPV6)
4166 if (family
== PF_INET6
) {
4168 * Handle mapped IPv4 packets arriving
4169 * via IPv6 sockets. Don't set up netlabel
4170 * processing on IPv6.
4172 if (skb
->protocol
== htons(ETH_P_IP
))
4177 #endif /* CONFIG_IPV6 */
4179 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4181 * If there is a secmark use it rather than the CIPSO label.
4182 * If there is no secmark fall back to CIPSO.
4183 * The secmark is assumed to reflect policy better.
4185 if (skb
&& skb
->secmark
!= 0) {
4186 skp
= smack_from_secid(skb
->secmark
);
4189 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4191 netlbl_secattr_init(&secattr
);
4192 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4194 skp
= smack_from_secattr(&secattr
, ssp
);
4196 skp
= &smack_known_huh
;
4197 netlbl_secattr_destroy(&secattr
);
4199 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4204 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4205 ad
.a
.u
.net
->family
= family
;
4206 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4207 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4210 * Receiving a packet requires that the other end be able to write
4211 * here. Read access is not required.
4213 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4214 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4219 * Save the peer's label in the request_sock so we can later setup
4220 * smk_packet in the child socket so that SO_PEERCRED can report it.
4222 req
->peer_secid
= skp
->smk_secid
;
4225 * We need to decide if we want to label the incoming connection here
4226 * if we do we only need to label the request_sock and the stack will
4227 * propagate the wire-label to the sock when it is created.
4230 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4232 hskp
= smack_ipv4host_label(&addr
);
4236 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4238 netlbl_req_delattr(req
);
4244 * smack_inet_csk_clone - Copy the connection information to the new socket
4245 * @sk: the new socket
4246 * @req: the connection's request_sock
4248 * Transfer the connection's peer label to the newly created socket.
4250 static void smack_inet_csk_clone(struct sock
*sk
,
4251 const struct request_sock
*req
)
4253 struct socket_smack
*ssp
= sk
->sk_security
;
4254 struct smack_known
*skp
;
4256 if (req
->peer_secid
!= 0) {
4257 skp
= smack_from_secid(req
->peer_secid
);
4258 ssp
->smk_packet
= skp
;
4260 ssp
->smk_packet
= NULL
;
4264 * Key management security hooks
4266 * Casey has not tested key support very heavily.
4267 * The permission check is most likely too restrictive.
4268 * If you care about keys please have a look.
4273 * smack_key_alloc - Set the key security blob
4275 * @cred: the credentials to use
4278 * No allocation required
4282 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4283 unsigned long flags
)
4285 struct smack_known
*skp
= smk_of_task(cred
->security
);
4287 key
->security
= skp
;
4292 * smack_key_free - Clear the key security blob
4295 * Clear the blob pointer
4297 static void smack_key_free(struct key
*key
)
4299 key
->security
= NULL
;
4303 * smack_key_permission - Smack access on a key
4304 * @key_ref: gets to the object
4305 * @cred: the credentials to use
4306 * @perm: requested key permissions
4308 * Return 0 if the task has read and write to the object,
4309 * an error code otherwise
4311 static int smack_key_permission(key_ref_t key_ref
,
4312 const struct cred
*cred
, unsigned perm
)
4315 struct smk_audit_info ad
;
4316 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4320 keyp
= key_ref_to_ptr(key_ref
);
4324 * If the key hasn't been initialized give it access so that
4327 if (keyp
->security
== NULL
)
4330 * This should not occur
4335 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4336 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4337 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4339 if (perm
& KEY_NEED_READ
)
4341 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4342 request
= MAY_WRITE
;
4343 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4344 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4349 * smack_key_getsecurity - Smack label tagging the key
4350 * @key points to the key to be queried
4351 * @_buffer points to a pointer that should be set to point to the
4352 * resulting string (if no label or an error occurs).
4353 * Return the length of the string (including terminating NUL) or -ve if
4355 * May also return 0 (and a NULL buffer pointer) if there is no label.
4357 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4359 struct smack_known
*skp
= key
->security
;
4363 if (key
->security
== NULL
) {
4368 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4371 length
= strlen(copy
) + 1;
4377 #endif /* CONFIG_KEYS */
4382 * Audit requires a unique representation of each Smack specific
4383 * rule. This unique representation is used to distinguish the
4384 * object to be audited from remaining kernel objects and also
4385 * works as a glue between the audit hooks.
4387 * Since repository entries are added but never deleted, we'll use
4388 * the smack_known label address related to the given audit rule as
4389 * the needed unique representation. This also better fits the smack
4390 * model where nearly everything is a label.
4395 * smack_audit_rule_init - Initialize a smack audit rule
4396 * @field: audit rule fields given from user-space (audit.h)
4397 * @op: required testing operator (=, !=, >, <, ...)
4398 * @rulestr: smack label to be audited
4399 * @vrule: pointer to save our own audit rule representation
4401 * Prepare to audit cases where (@field @op @rulestr) is true.
4402 * The label to be audited is created if necessay.
4404 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4406 struct smack_known
*skp
;
4407 char **rule
= (char **)vrule
;
4410 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4413 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4416 skp
= smk_import_entry(rulestr
, 0);
4418 return PTR_ERR(skp
);
4420 *rule
= skp
->smk_known
;
4426 * smack_audit_rule_known - Distinguish Smack audit rules
4427 * @krule: rule of interest, in Audit kernel representation format
4429 * This is used to filter Smack rules from remaining Audit ones.
4430 * If it's proved that this rule belongs to us, the
4431 * audit_rule_match hook will be called to do the final judgement.
4433 static int smack_audit_rule_known(struct audit_krule
*krule
)
4435 struct audit_field
*f
;
4438 for (i
= 0; i
< krule
->field_count
; i
++) {
4439 f
= &krule
->fields
[i
];
4441 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4449 * smack_audit_rule_match - Audit given object ?
4450 * @secid: security id for identifying the object to test
4451 * @field: audit rule flags given from user-space
4452 * @op: required testing operator
4453 * @vrule: smack internal rule presentation
4454 * @actx: audit context associated with the check
4456 * The core Audit hook. It's used to take the decision of
4457 * whether to audit or not to audit a given object.
4459 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4460 struct audit_context
*actx
)
4462 struct smack_known
*skp
;
4465 if (unlikely(!rule
)) {
4466 WARN_ONCE(1, "Smack: missing rule\n");
4470 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4473 skp
= smack_from_secid(secid
);
4476 * No need to do string comparisons. If a match occurs,
4477 * both pointers will point to the same smack_known
4480 if (op
== Audit_equal
)
4481 return (rule
== skp
->smk_known
);
4482 if (op
== Audit_not_equal
)
4483 return (rule
!= skp
->smk_known
);
4489 * smack_audit_rule_free - free smack rule representation
4490 * @vrule: rule to be freed.
4492 * No memory was allocated.
4494 static void smack_audit_rule_free(void *vrule
)
4499 #endif /* CONFIG_AUDIT */
4502 * smack_ismaclabel - check if xattr @name references a smack MAC label
4503 * @name: Full xattr name to check.
4505 static int smack_ismaclabel(const char *name
)
4507 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4512 * smack_secid_to_secctx - return the smack label for a secid
4513 * @secid: incoming integer
4514 * @secdata: destination
4515 * @seclen: how long it is
4517 * Exists for networking code.
4519 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4521 struct smack_known
*skp
= smack_from_secid(secid
);
4524 *secdata
= skp
->smk_known
;
4525 *seclen
= strlen(skp
->smk_known
);
4530 * smack_secctx_to_secid - return the secid for a smack label
4531 * @secdata: smack label
4532 * @seclen: how long result is
4533 * @secid: outgoing integer
4535 * Exists for audit and networking code.
4537 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4539 struct smack_known
*skp
= smk_find_entry(secdata
);
4542 *secid
= skp
->smk_secid
;
4549 * smack_release_secctx - don't do anything.
4553 * Exists to make sure nothing gets done, and properly
4555 static void smack_release_secctx(char *secdata
, u32 seclen
)
4559 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4561 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4564 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4566 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4569 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4572 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4580 static struct security_hook_list smack_hooks
[] = {
4581 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4582 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4583 LSM_HOOK_INIT(syslog
, smack_syslog
),
4585 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4586 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4587 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4588 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4589 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4590 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4591 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4593 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4594 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4595 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4597 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4598 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4599 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4600 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4601 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4602 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4603 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4604 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4605 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4606 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4607 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4608 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4609 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4610 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4611 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4612 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4613 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4614 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4616 LSM_HOOK_INIT(file_permission
, smack_file_permission
),
4617 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4618 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4619 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4620 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4621 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4622 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4623 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4624 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4625 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4626 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4628 LSM_HOOK_INIT(file_open
, smack_file_open
),
4630 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4631 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4632 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4633 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4634 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4635 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4636 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4637 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4638 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4639 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4640 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4641 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4642 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4643 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4644 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4645 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4646 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4647 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4648 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4650 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4651 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4653 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4654 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4656 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4657 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4658 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4659 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4660 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4661 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4663 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4664 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4665 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4666 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4667 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4669 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4670 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4671 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4672 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4673 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4675 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4677 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4678 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4680 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4681 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4683 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4684 #ifdef SMACK_IPV6_PORT_LABELING
4685 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4687 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4688 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4689 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4690 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4691 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4692 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4693 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4694 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4695 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4696 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4698 /* key management security hooks */
4700 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4701 LSM_HOOK_INIT(key_free
, smack_key_free
),
4702 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4703 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4704 #endif /* CONFIG_KEYS */
4708 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4709 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4710 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4711 LSM_HOOK_INIT(audit_rule_free
, smack_audit_rule_free
),
4712 #endif /* CONFIG_AUDIT */
4714 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4715 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4716 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4717 LSM_HOOK_INIT(release_secctx
, smack_release_secctx
),
4718 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4719 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4720 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4724 static __init
void init_smack_known_list(void)
4727 * Initialize rule list locks
4729 mutex_init(&smack_known_huh
.smk_rules_lock
);
4730 mutex_init(&smack_known_hat
.smk_rules_lock
);
4731 mutex_init(&smack_known_floor
.smk_rules_lock
);
4732 mutex_init(&smack_known_star
.smk_rules_lock
);
4733 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4734 mutex_init(&smack_known_web
.smk_rules_lock
);
4736 * Initialize rule lists
4738 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4739 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4740 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4741 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4742 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4743 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4745 * Create the known labels list
4747 smk_insert_entry(&smack_known_huh
);
4748 smk_insert_entry(&smack_known_hat
);
4749 smk_insert_entry(&smack_known_star
);
4750 smk_insert_entry(&smack_known_floor
);
4751 smk_insert_entry(&smack_known_invalid
);
4752 smk_insert_entry(&smack_known_web
);
4756 * smack_init - initialize the smack system
4760 static __init
int smack_init(void)
4763 struct task_smack
*tsp
;
4765 if (!security_module_enable("smack"))
4768 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4769 if (!smack_inode_cache
)
4772 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4775 kmem_cache_destroy(smack_inode_cache
);
4781 pr_info("Smack: Initializing.\n");
4782 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4783 pr_info("Smack: Netfilter enabled.\n");
4785 #ifdef SMACK_IPV6_PORT_LABELING
4786 pr_info("Smack: IPv6 port labeling enabled.\n");
4788 #ifdef SMACK_IPV6_SECMARK_LABELING
4789 pr_info("Smack: IPv6 Netfilter enabled.\n");
4793 * Set the security state for the initial task.
4795 cred
= (struct cred
*) current
->cred
;
4796 cred
->security
= tsp
;
4798 /* initialize the smack_known_list */
4799 init_smack_known_list();
4804 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4810 * Smack requires early initialization in order to label
4811 * all processes and objects when they are created.
4813 security_initcall(smack_init
);