2 * NSA Security-Enhanced Linux (SELinux) security module
4 * This file contains the SELinux hook function implementations.
6 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
7 * Chris Vance, <cvance@nai.com>
8 * Wayne Salamon, <wsalamon@nai.com>
9 * James Morris <jmorris@redhat.com>
11 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
12 * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Eric Paris <eparis@redhat.com>
14 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
15 * <dgoeddel@trustedcs.com>
16 * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P.
17 * Paul Moore <paul@paul-moore.com>
18 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
19 * Yuichi Nakamura <ynakam@hitachisoft.jp>
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License version 2,
23 * as published by the Free Software Foundation.
26 #include <linux/init.h>
28 #include <linux/kernel.h>
29 #include <linux/tracehook.h>
30 #include <linux/errno.h>
31 #include <linux/sched.h>
32 #include <linux/security.h>
33 #include <linux/xattr.h>
34 #include <linux/capability.h>
35 #include <linux/unistd.h>
37 #include <linux/mman.h>
38 #include <linux/slab.h>
39 #include <linux/pagemap.h>
40 #include <linux/proc_fs.h>
41 #include <linux/swap.h>
42 #include <linux/spinlock.h>
43 #include <linux/syscalls.h>
44 #include <linux/dcache.h>
45 #include <linux/file.h>
46 #include <linux/fdtable.h>
47 #include <linux/namei.h>
48 #include <linux/mount.h>
49 #include <linux/netfilter_ipv4.h>
50 #include <linux/netfilter_ipv6.h>
51 #include <linux/tty.h>
53 #include <net/ip.h> /* for local_port_range[] */
55 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
56 #include <net/inet_connection_sock.h>
57 #include <net/net_namespace.h>
58 #include <net/netlabel.h>
59 #include <linux/uaccess.h>
60 #include <asm/ioctls.h>
61 #include <linux/atomic.h>
62 #include <linux/bitops.h>
63 #include <linux/interrupt.h>
64 #include <linux/netdevice.h> /* for network interface checks */
65 #include <net/netlink.h>
66 #include <linux/tcp.h>
67 #include <linux/udp.h>
68 #include <linux/dccp.h>
69 #include <linux/quota.h>
70 #include <linux/un.h> /* for Unix socket types */
71 #include <net/af_unix.h> /* for Unix socket types */
72 #include <linux/parser.h>
73 #include <linux/nfs_mount.h>
75 #include <linux/hugetlb.h>
76 #include <linux/personality.h>
77 #include <linux/audit.h>
78 #include <linux/string.h>
79 #include <linux/selinux.h>
80 #include <linux/mutex.h>
81 #include <linux/posix-timers.h>
82 #include <linux/syslog.h>
83 #include <linux/user_namespace.h>
84 #include <linux/export.h>
85 #include <linux/msg.h>
86 #include <linux/shm.h>
98 /* SECMARK reference count */
99 static atomic_t selinux_secmark_refcount
= ATOMIC_INIT(0);
101 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
102 int selinux_enforcing
;
104 static int __init
enforcing_setup(char *str
)
106 unsigned long enforcing
;
107 if (!kstrtoul(str
, 0, &enforcing
))
108 selinux_enforcing
= enforcing
? 1 : 0;
111 __setup("enforcing=", enforcing_setup
);
114 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
115 int selinux_enabled
= CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE
;
117 static int __init
selinux_enabled_setup(char *str
)
119 unsigned long enabled
;
120 if (!kstrtoul(str
, 0, &enabled
))
121 selinux_enabled
= enabled
? 1 : 0;
124 __setup("selinux=", selinux_enabled_setup
);
126 int selinux_enabled
= 1;
129 static struct kmem_cache
*sel_inode_cache
;
132 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
135 * This function checks the SECMARK reference counter to see if any SECMARK
136 * targets are currently configured, if the reference counter is greater than
137 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
138 * enabled, false (0) if SECMARK is disabled. If the always_check_network
139 * policy capability is enabled, SECMARK is always considered enabled.
142 static int selinux_secmark_enabled(void)
144 return (selinux_policycap_alwaysnetwork
|| atomic_read(&selinux_secmark_refcount
));
148 * selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled
151 * This function checks if NetLabel or labeled IPSEC is enabled. Returns true
152 * (1) if any are enabled or false (0) if neither are enabled. If the
153 * always_check_network policy capability is enabled, peer labeling
154 * is always considered enabled.
157 static int selinux_peerlbl_enabled(void)
159 return (selinux_policycap_alwaysnetwork
|| netlbl_enabled() || selinux_xfrm_enabled());
162 static int selinux_netcache_avc_callback(u32 event
)
164 if (event
== AVC_CALLBACK_RESET
) {
174 * initialise the security for the init task
176 static void cred_init_security(void)
178 struct cred
*cred
= (struct cred
*) current
->real_cred
;
179 struct task_security_struct
*tsec
;
181 tsec
= kzalloc(sizeof(struct task_security_struct
), GFP_KERNEL
);
183 panic("SELinux: Failed to initialize initial task.\n");
185 tsec
->osid
= tsec
->sid
= SECINITSID_KERNEL
;
186 cred
->security
= tsec
;
190 * get the security ID of a set of credentials
192 static inline u32
cred_sid(const struct cred
*cred
)
194 const struct task_security_struct
*tsec
;
196 tsec
= cred
->security
;
201 * get the objective security ID of a task
203 static inline u32
task_sid(const struct task_struct
*task
)
208 sid
= cred_sid(__task_cred(task
));
214 * get the subjective security ID of the current task
216 static inline u32
current_sid(void)
218 const struct task_security_struct
*tsec
= current_security();
223 /* Allocate and free functions for each kind of security blob. */
225 static int inode_alloc_security(struct inode
*inode
)
227 struct inode_security_struct
*isec
;
228 u32 sid
= current_sid();
230 isec
= kmem_cache_zalloc(sel_inode_cache
, GFP_NOFS
);
234 mutex_init(&isec
->lock
);
235 INIT_LIST_HEAD(&isec
->list
);
237 isec
->sid
= SECINITSID_UNLABELED
;
238 isec
->sclass
= SECCLASS_FILE
;
239 isec
->task_sid
= sid
;
240 inode
->i_security
= isec
;
245 static void inode_free_rcu(struct rcu_head
*head
)
247 struct inode_security_struct
*isec
;
249 isec
= container_of(head
, struct inode_security_struct
, rcu
);
250 kmem_cache_free(sel_inode_cache
, isec
);
253 static void inode_free_security(struct inode
*inode
)
255 struct inode_security_struct
*isec
= inode
->i_security
;
256 struct superblock_security_struct
*sbsec
= inode
->i_sb
->s_security
;
258 spin_lock(&sbsec
->isec_lock
);
259 if (!list_empty(&isec
->list
))
260 list_del_init(&isec
->list
);
261 spin_unlock(&sbsec
->isec_lock
);
264 * The inode may still be referenced in a path walk and
265 * a call to selinux_inode_permission() can be made
266 * after inode_free_security() is called. Ideally, the VFS
267 * wouldn't do this, but fixing that is a much harder
268 * job. For now, simply free the i_security via RCU, and
269 * leave the current inode->i_security pointer intact.
270 * The inode will be freed after the RCU grace period too.
272 call_rcu(&isec
->rcu
, inode_free_rcu
);
275 static int file_alloc_security(struct file
*file
)
277 struct file_security_struct
*fsec
;
278 u32 sid
= current_sid();
280 fsec
= kzalloc(sizeof(struct file_security_struct
), GFP_KERNEL
);
285 fsec
->fown_sid
= sid
;
286 file
->f_security
= fsec
;
291 static void file_free_security(struct file
*file
)
293 struct file_security_struct
*fsec
= file
->f_security
;
294 file
->f_security
= NULL
;
298 static int superblock_alloc_security(struct super_block
*sb
)
300 struct superblock_security_struct
*sbsec
;
302 sbsec
= kzalloc(sizeof(struct superblock_security_struct
), GFP_KERNEL
);
306 mutex_init(&sbsec
->lock
);
307 INIT_LIST_HEAD(&sbsec
->isec_head
);
308 spin_lock_init(&sbsec
->isec_lock
);
310 sbsec
->sid
= SECINITSID_UNLABELED
;
311 sbsec
->def_sid
= SECINITSID_FILE
;
312 sbsec
->mntpoint_sid
= SECINITSID_UNLABELED
;
313 sb
->s_security
= sbsec
;
318 static void superblock_free_security(struct super_block
*sb
)
320 struct superblock_security_struct
*sbsec
= sb
->s_security
;
321 sb
->s_security
= NULL
;
325 /* The file system's label must be initialized prior to use. */
327 static const char *labeling_behaviors
[7] = {
329 "uses transition SIDs",
331 "uses genfs_contexts",
332 "not configured for labeling",
333 "uses mountpoint labeling",
334 "uses native labeling",
337 static int inode_doinit_with_dentry(struct inode
*inode
, struct dentry
*opt_dentry
);
339 static inline int inode_doinit(struct inode
*inode
)
341 return inode_doinit_with_dentry(inode
, NULL
);
350 Opt_labelsupport
= 5,
354 #define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1)
356 static const match_table_t tokens
= {
357 {Opt_context
, CONTEXT_STR
"%s"},
358 {Opt_fscontext
, FSCONTEXT_STR
"%s"},
359 {Opt_defcontext
, DEFCONTEXT_STR
"%s"},
360 {Opt_rootcontext
, ROOTCONTEXT_STR
"%s"},
361 {Opt_labelsupport
, LABELSUPP_STR
},
365 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
367 static int may_context_mount_sb_relabel(u32 sid
,
368 struct superblock_security_struct
*sbsec
,
369 const struct cred
*cred
)
371 const struct task_security_struct
*tsec
= cred
->security
;
374 rc
= avc_has_perm(tsec
->sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
375 FILESYSTEM__RELABELFROM
, NULL
);
379 rc
= avc_has_perm(tsec
->sid
, sid
, SECCLASS_FILESYSTEM
,
380 FILESYSTEM__RELABELTO
, NULL
);
384 static int may_context_mount_inode_relabel(u32 sid
,
385 struct superblock_security_struct
*sbsec
,
386 const struct cred
*cred
)
388 const struct task_security_struct
*tsec
= cred
->security
;
390 rc
= avc_has_perm(tsec
->sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
391 FILESYSTEM__RELABELFROM
, NULL
);
395 rc
= avc_has_perm(sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
396 FILESYSTEM__ASSOCIATE
, NULL
);
400 static int selinux_is_sblabel_mnt(struct super_block
*sb
)
402 struct superblock_security_struct
*sbsec
= sb
->s_security
;
404 return sbsec
->behavior
== SECURITY_FS_USE_XATTR
||
405 sbsec
->behavior
== SECURITY_FS_USE_TRANS
||
406 sbsec
->behavior
== SECURITY_FS_USE_TASK
||
407 /* Special handling. Genfs but also in-core setxattr handler */
408 !strcmp(sb
->s_type
->name
, "sysfs") ||
409 !strcmp(sb
->s_type
->name
, "pstore") ||
410 !strcmp(sb
->s_type
->name
, "debugfs") ||
411 !strcmp(sb
->s_type
->name
, "rootfs");
414 static int sb_finish_set_opts(struct super_block
*sb
)
416 struct superblock_security_struct
*sbsec
= sb
->s_security
;
417 struct dentry
*root
= sb
->s_root
;
418 struct inode
*root_inode
= root
->d_inode
;
421 if (sbsec
->behavior
== SECURITY_FS_USE_XATTR
) {
422 /* Make sure that the xattr handler exists and that no
423 error other than -ENODATA is returned by getxattr on
424 the root directory. -ENODATA is ok, as this may be
425 the first boot of the SELinux kernel before we have
426 assigned xattr values to the filesystem. */
427 if (!root_inode
->i_op
->getxattr
) {
428 printk(KERN_WARNING
"SELinux: (dev %s, type %s) has no "
429 "xattr support\n", sb
->s_id
, sb
->s_type
->name
);
433 rc
= root_inode
->i_op
->getxattr(root
, XATTR_NAME_SELINUX
, NULL
, 0);
434 if (rc
< 0 && rc
!= -ENODATA
) {
435 if (rc
== -EOPNOTSUPP
)
436 printk(KERN_WARNING
"SELinux: (dev %s, type "
437 "%s) has no security xattr handler\n",
438 sb
->s_id
, sb
->s_type
->name
);
440 printk(KERN_WARNING
"SELinux: (dev %s, type "
441 "%s) getxattr errno %d\n", sb
->s_id
,
442 sb
->s_type
->name
, -rc
);
447 if (sbsec
->behavior
> ARRAY_SIZE(labeling_behaviors
))
448 printk(KERN_ERR
"SELinux: initialized (dev %s, type %s), unknown behavior\n",
449 sb
->s_id
, sb
->s_type
->name
);
451 sbsec
->flags
|= SE_SBINITIALIZED
;
452 if (selinux_is_sblabel_mnt(sb
))
453 sbsec
->flags
|= SBLABEL_MNT
;
455 /* Initialize the root inode. */
456 rc
= inode_doinit_with_dentry(root_inode
, root
);
458 /* Initialize any other inodes associated with the superblock, e.g.
459 inodes created prior to initial policy load or inodes created
460 during get_sb by a pseudo filesystem that directly
462 spin_lock(&sbsec
->isec_lock
);
464 if (!list_empty(&sbsec
->isec_head
)) {
465 struct inode_security_struct
*isec
=
466 list_entry(sbsec
->isec_head
.next
,
467 struct inode_security_struct
, list
);
468 struct inode
*inode
= isec
->inode
;
469 list_del_init(&isec
->list
);
470 spin_unlock(&sbsec
->isec_lock
);
471 inode
= igrab(inode
);
473 if (!IS_PRIVATE(inode
))
477 spin_lock(&sbsec
->isec_lock
);
480 spin_unlock(&sbsec
->isec_lock
);
486 * This function should allow an FS to ask what it's mount security
487 * options were so it can use those later for submounts, displaying
488 * mount options, or whatever.
490 static int selinux_get_mnt_opts(const struct super_block
*sb
,
491 struct security_mnt_opts
*opts
)
494 struct superblock_security_struct
*sbsec
= sb
->s_security
;
495 char *context
= NULL
;
499 security_init_mnt_opts(opts
);
501 if (!(sbsec
->flags
& SE_SBINITIALIZED
))
507 /* make sure we always check enough bits to cover the mask */
508 BUILD_BUG_ON(SE_MNTMASK
>= (1 << NUM_SEL_MNT_OPTS
));
510 tmp
= sbsec
->flags
& SE_MNTMASK
;
511 /* count the number of mount options for this sb */
512 for (i
= 0; i
< NUM_SEL_MNT_OPTS
; i
++) {
514 opts
->num_mnt_opts
++;
517 /* Check if the Label support flag is set */
518 if (sbsec
->flags
& SBLABEL_MNT
)
519 opts
->num_mnt_opts
++;
521 opts
->mnt_opts
= kcalloc(opts
->num_mnt_opts
, sizeof(char *), GFP_ATOMIC
);
522 if (!opts
->mnt_opts
) {
527 opts
->mnt_opts_flags
= kcalloc(opts
->num_mnt_opts
, sizeof(int), GFP_ATOMIC
);
528 if (!opts
->mnt_opts_flags
) {
534 if (sbsec
->flags
& FSCONTEXT_MNT
) {
535 rc
= security_sid_to_context(sbsec
->sid
, &context
, &len
);
538 opts
->mnt_opts
[i
] = context
;
539 opts
->mnt_opts_flags
[i
++] = FSCONTEXT_MNT
;
541 if (sbsec
->flags
& CONTEXT_MNT
) {
542 rc
= security_sid_to_context(sbsec
->mntpoint_sid
, &context
, &len
);
545 opts
->mnt_opts
[i
] = context
;
546 opts
->mnt_opts_flags
[i
++] = CONTEXT_MNT
;
548 if (sbsec
->flags
& DEFCONTEXT_MNT
) {
549 rc
= security_sid_to_context(sbsec
->def_sid
, &context
, &len
);
552 opts
->mnt_opts
[i
] = context
;
553 opts
->mnt_opts_flags
[i
++] = DEFCONTEXT_MNT
;
555 if (sbsec
->flags
& ROOTCONTEXT_MNT
) {
556 struct inode
*root
= sbsec
->sb
->s_root
->d_inode
;
557 struct inode_security_struct
*isec
= root
->i_security
;
559 rc
= security_sid_to_context(isec
->sid
, &context
, &len
);
562 opts
->mnt_opts
[i
] = context
;
563 opts
->mnt_opts_flags
[i
++] = ROOTCONTEXT_MNT
;
565 if (sbsec
->flags
& SBLABEL_MNT
) {
566 opts
->mnt_opts
[i
] = NULL
;
567 opts
->mnt_opts_flags
[i
++] = SBLABEL_MNT
;
570 BUG_ON(i
!= opts
->num_mnt_opts
);
575 security_free_mnt_opts(opts
);
579 static int bad_option(struct superblock_security_struct
*sbsec
, char flag
,
580 u32 old_sid
, u32 new_sid
)
582 char mnt_flags
= sbsec
->flags
& SE_MNTMASK
;
584 /* check if the old mount command had the same options */
585 if (sbsec
->flags
& SE_SBINITIALIZED
)
586 if (!(sbsec
->flags
& flag
) ||
587 (old_sid
!= new_sid
))
590 /* check if we were passed the same options twice,
591 * aka someone passed context=a,context=b
593 if (!(sbsec
->flags
& SE_SBINITIALIZED
))
594 if (mnt_flags
& flag
)
600 * Allow filesystems with binary mount data to explicitly set mount point
601 * labeling information.
603 static int selinux_set_mnt_opts(struct super_block
*sb
,
604 struct security_mnt_opts
*opts
,
605 unsigned long kern_flags
,
606 unsigned long *set_kern_flags
)
608 const struct cred
*cred
= current_cred();
610 struct superblock_security_struct
*sbsec
= sb
->s_security
;
611 const char *name
= sb
->s_type
->name
;
612 struct inode
*inode
= sbsec
->sb
->s_root
->d_inode
;
613 struct inode_security_struct
*root_isec
= inode
->i_security
;
614 u32 fscontext_sid
= 0, context_sid
= 0, rootcontext_sid
= 0;
615 u32 defcontext_sid
= 0;
616 char **mount_options
= opts
->mnt_opts
;
617 int *flags
= opts
->mnt_opts_flags
;
618 int num_opts
= opts
->num_mnt_opts
;
620 mutex_lock(&sbsec
->lock
);
622 if (!ss_initialized
) {
624 /* Defer initialization until selinux_complete_init,
625 after the initial policy is loaded and the security
626 server is ready to handle calls. */
630 printk(KERN_WARNING
"SELinux: Unable to set superblock options "
631 "before the security server is initialized\n");
634 if (kern_flags
&& !set_kern_flags
) {
635 /* Specifying internal flags without providing a place to
636 * place the results is not allowed */
642 * Binary mount data FS will come through this function twice. Once
643 * from an explicit call and once from the generic calls from the vfs.
644 * Since the generic VFS calls will not contain any security mount data
645 * we need to skip the double mount verification.
647 * This does open a hole in which we will not notice if the first
648 * mount using this sb set explict options and a second mount using
649 * this sb does not set any security options. (The first options
650 * will be used for both mounts)
652 if ((sbsec
->flags
& SE_SBINITIALIZED
) && (sb
->s_type
->fs_flags
& FS_BINARY_MOUNTDATA
)
657 * parse the mount options, check if they are valid sids.
658 * also check if someone is trying to mount the same sb more
659 * than once with different security options.
661 for (i
= 0; i
< num_opts
; i
++) {
664 if (flags
[i
] == SBLABEL_MNT
)
666 rc
= security_context_to_sid(mount_options
[i
],
667 strlen(mount_options
[i
]), &sid
, GFP_KERNEL
);
669 printk(KERN_WARNING
"SELinux: security_context_to_sid"
670 "(%s) failed for (dev %s, type %s) errno=%d\n",
671 mount_options
[i
], sb
->s_id
, name
, rc
);
678 if (bad_option(sbsec
, FSCONTEXT_MNT
, sbsec
->sid
,
680 goto out_double_mount
;
682 sbsec
->flags
|= FSCONTEXT_MNT
;
687 if (bad_option(sbsec
, CONTEXT_MNT
, sbsec
->mntpoint_sid
,
689 goto out_double_mount
;
691 sbsec
->flags
|= CONTEXT_MNT
;
693 case ROOTCONTEXT_MNT
:
694 rootcontext_sid
= sid
;
696 if (bad_option(sbsec
, ROOTCONTEXT_MNT
, root_isec
->sid
,
698 goto out_double_mount
;
700 sbsec
->flags
|= ROOTCONTEXT_MNT
;
704 defcontext_sid
= sid
;
706 if (bad_option(sbsec
, DEFCONTEXT_MNT
, sbsec
->def_sid
,
708 goto out_double_mount
;
710 sbsec
->flags
|= DEFCONTEXT_MNT
;
719 if (sbsec
->flags
& SE_SBINITIALIZED
) {
720 /* previously mounted with options, but not on this attempt? */
721 if ((sbsec
->flags
& SE_MNTMASK
) && !num_opts
)
722 goto out_double_mount
;
727 if (strcmp(sb
->s_type
->name
, "proc") == 0)
728 sbsec
->flags
|= SE_SBPROC
;
730 if (!sbsec
->behavior
) {
732 * Determine the labeling behavior to use for this
735 rc
= security_fs_use(sb
);
738 "%s: security_fs_use(%s) returned %d\n",
739 __func__
, sb
->s_type
->name
, rc
);
743 /* sets the context of the superblock for the fs being mounted. */
745 rc
= may_context_mount_sb_relabel(fscontext_sid
, sbsec
, cred
);
749 sbsec
->sid
= fscontext_sid
;
753 * Switch to using mount point labeling behavior.
754 * sets the label used on all file below the mountpoint, and will set
755 * the superblock context if not already set.
757 if (kern_flags
& SECURITY_LSM_NATIVE_LABELS
&& !context_sid
) {
758 sbsec
->behavior
= SECURITY_FS_USE_NATIVE
;
759 *set_kern_flags
|= SECURITY_LSM_NATIVE_LABELS
;
763 if (!fscontext_sid
) {
764 rc
= may_context_mount_sb_relabel(context_sid
, sbsec
,
768 sbsec
->sid
= context_sid
;
770 rc
= may_context_mount_inode_relabel(context_sid
, sbsec
,
775 if (!rootcontext_sid
)
776 rootcontext_sid
= context_sid
;
778 sbsec
->mntpoint_sid
= context_sid
;
779 sbsec
->behavior
= SECURITY_FS_USE_MNTPOINT
;
782 if (rootcontext_sid
) {
783 rc
= may_context_mount_inode_relabel(rootcontext_sid
, sbsec
,
788 root_isec
->sid
= rootcontext_sid
;
789 root_isec
->initialized
= 1;
792 if (defcontext_sid
) {
793 if (sbsec
->behavior
!= SECURITY_FS_USE_XATTR
&&
794 sbsec
->behavior
!= SECURITY_FS_USE_NATIVE
) {
796 printk(KERN_WARNING
"SELinux: defcontext option is "
797 "invalid for this filesystem type\n");
801 if (defcontext_sid
!= sbsec
->def_sid
) {
802 rc
= may_context_mount_inode_relabel(defcontext_sid
,
808 sbsec
->def_sid
= defcontext_sid
;
811 rc
= sb_finish_set_opts(sb
);
813 mutex_unlock(&sbsec
->lock
);
817 printk(KERN_WARNING
"SELinux: mount invalid. Same superblock, different "
818 "security settings for (dev %s, type %s)\n", sb
->s_id
, name
);
822 static int selinux_cmp_sb_context(const struct super_block
*oldsb
,
823 const struct super_block
*newsb
)
825 struct superblock_security_struct
*old
= oldsb
->s_security
;
826 struct superblock_security_struct
*new = newsb
->s_security
;
827 char oldflags
= old
->flags
& SE_MNTMASK
;
828 char newflags
= new->flags
& SE_MNTMASK
;
830 if (oldflags
!= newflags
)
832 if ((oldflags
& FSCONTEXT_MNT
) && old
->sid
!= new->sid
)
834 if ((oldflags
& CONTEXT_MNT
) && old
->mntpoint_sid
!= new->mntpoint_sid
)
836 if ((oldflags
& DEFCONTEXT_MNT
) && old
->def_sid
!= new->def_sid
)
838 if (oldflags
& ROOTCONTEXT_MNT
) {
839 struct inode_security_struct
*oldroot
= oldsb
->s_root
->d_inode
->i_security
;
840 struct inode_security_struct
*newroot
= newsb
->s_root
->d_inode
->i_security
;
841 if (oldroot
->sid
!= newroot
->sid
)
846 printk(KERN_WARNING
"SELinux: mount invalid. Same superblock, "
847 "different security settings for (dev %s, "
848 "type %s)\n", newsb
->s_id
, newsb
->s_type
->name
);
852 static int selinux_sb_clone_mnt_opts(const struct super_block
*oldsb
,
853 struct super_block
*newsb
)
855 const struct superblock_security_struct
*oldsbsec
= oldsb
->s_security
;
856 struct superblock_security_struct
*newsbsec
= newsb
->s_security
;
858 int set_fscontext
= (oldsbsec
->flags
& FSCONTEXT_MNT
);
859 int set_context
= (oldsbsec
->flags
& CONTEXT_MNT
);
860 int set_rootcontext
= (oldsbsec
->flags
& ROOTCONTEXT_MNT
);
863 * if the parent was able to be mounted it clearly had no special lsm
864 * mount options. thus we can safely deal with this superblock later
869 /* how can we clone if the old one wasn't set up?? */
870 BUG_ON(!(oldsbsec
->flags
& SE_SBINITIALIZED
));
872 /* if fs is reusing a sb, make sure that the contexts match */
873 if (newsbsec
->flags
& SE_SBINITIALIZED
)
874 return selinux_cmp_sb_context(oldsb
, newsb
);
876 mutex_lock(&newsbsec
->lock
);
878 newsbsec
->flags
= oldsbsec
->flags
;
880 newsbsec
->sid
= oldsbsec
->sid
;
881 newsbsec
->def_sid
= oldsbsec
->def_sid
;
882 newsbsec
->behavior
= oldsbsec
->behavior
;
885 u32 sid
= oldsbsec
->mntpoint_sid
;
889 if (!set_rootcontext
) {
890 struct inode
*newinode
= newsb
->s_root
->d_inode
;
891 struct inode_security_struct
*newisec
= newinode
->i_security
;
894 newsbsec
->mntpoint_sid
= sid
;
896 if (set_rootcontext
) {
897 const struct inode
*oldinode
= oldsb
->s_root
->d_inode
;
898 const struct inode_security_struct
*oldisec
= oldinode
->i_security
;
899 struct inode
*newinode
= newsb
->s_root
->d_inode
;
900 struct inode_security_struct
*newisec
= newinode
->i_security
;
902 newisec
->sid
= oldisec
->sid
;
905 sb_finish_set_opts(newsb
);
906 mutex_unlock(&newsbsec
->lock
);
910 static int selinux_parse_opts_str(char *options
,
911 struct security_mnt_opts
*opts
)
914 char *context
= NULL
, *defcontext
= NULL
;
915 char *fscontext
= NULL
, *rootcontext
= NULL
;
916 int rc
, num_mnt_opts
= 0;
918 opts
->num_mnt_opts
= 0;
920 /* Standard string-based options. */
921 while ((p
= strsep(&options
, "|")) != NULL
) {
923 substring_t args
[MAX_OPT_ARGS
];
928 token
= match_token(p
, tokens
, args
);
932 if (context
|| defcontext
) {
934 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
937 context
= match_strdup(&args
[0]);
947 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
950 fscontext
= match_strdup(&args
[0]);
957 case Opt_rootcontext
:
960 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
963 rootcontext
= match_strdup(&args
[0]);
971 if (context
|| defcontext
) {
973 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
976 defcontext
= match_strdup(&args
[0]);
982 case Opt_labelsupport
:
986 printk(KERN_WARNING
"SELinux: unknown mount option\n");
993 opts
->mnt_opts
= kcalloc(NUM_SEL_MNT_OPTS
, sizeof(char *), GFP_ATOMIC
);
997 opts
->mnt_opts_flags
= kcalloc(NUM_SEL_MNT_OPTS
, sizeof(int), GFP_ATOMIC
);
998 if (!opts
->mnt_opts_flags
) {
999 kfree(opts
->mnt_opts
);
1004 opts
->mnt_opts
[num_mnt_opts
] = fscontext
;
1005 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSCONTEXT_MNT
;
1008 opts
->mnt_opts
[num_mnt_opts
] = context
;
1009 opts
->mnt_opts_flags
[num_mnt_opts
++] = CONTEXT_MNT
;
1012 opts
->mnt_opts
[num_mnt_opts
] = rootcontext
;
1013 opts
->mnt_opts_flags
[num_mnt_opts
++] = ROOTCONTEXT_MNT
;
1016 opts
->mnt_opts
[num_mnt_opts
] = defcontext
;
1017 opts
->mnt_opts_flags
[num_mnt_opts
++] = DEFCONTEXT_MNT
;
1020 opts
->num_mnt_opts
= num_mnt_opts
;
1031 * string mount options parsing and call set the sbsec
1033 static int superblock_doinit(struct super_block
*sb
, void *data
)
1036 char *options
= data
;
1037 struct security_mnt_opts opts
;
1039 security_init_mnt_opts(&opts
);
1044 BUG_ON(sb
->s_type
->fs_flags
& FS_BINARY_MOUNTDATA
);
1046 rc
= selinux_parse_opts_str(options
, &opts
);
1051 rc
= selinux_set_mnt_opts(sb
, &opts
, 0, NULL
);
1054 security_free_mnt_opts(&opts
);
1058 static void selinux_write_opts(struct seq_file
*m
,
1059 struct security_mnt_opts
*opts
)
1064 for (i
= 0; i
< opts
->num_mnt_opts
; i
++) {
1067 if (opts
->mnt_opts
[i
])
1068 has_comma
= strchr(opts
->mnt_opts
[i
], ',');
1072 switch (opts
->mnt_opts_flags
[i
]) {
1074 prefix
= CONTEXT_STR
;
1077 prefix
= FSCONTEXT_STR
;
1079 case ROOTCONTEXT_MNT
:
1080 prefix
= ROOTCONTEXT_STR
;
1082 case DEFCONTEXT_MNT
:
1083 prefix
= DEFCONTEXT_STR
;
1087 seq_puts(m
, LABELSUPP_STR
);
1093 /* we need a comma before each option */
1095 seq_puts(m
, prefix
);
1098 seq_puts(m
, opts
->mnt_opts
[i
]);
1104 static int selinux_sb_show_options(struct seq_file
*m
, struct super_block
*sb
)
1106 struct security_mnt_opts opts
;
1109 rc
= selinux_get_mnt_opts(sb
, &opts
);
1111 /* before policy load we may get EINVAL, don't show anything */
1117 selinux_write_opts(m
, &opts
);
1119 security_free_mnt_opts(&opts
);
1124 static inline u16
inode_mode_to_security_class(umode_t mode
)
1126 switch (mode
& S_IFMT
) {
1128 return SECCLASS_SOCK_FILE
;
1130 return SECCLASS_LNK_FILE
;
1132 return SECCLASS_FILE
;
1134 return SECCLASS_BLK_FILE
;
1136 return SECCLASS_DIR
;
1138 return SECCLASS_CHR_FILE
;
1140 return SECCLASS_FIFO_FILE
;
1144 return SECCLASS_FILE
;
1147 static inline int default_protocol_stream(int protocol
)
1149 return (protocol
== IPPROTO_IP
|| protocol
== IPPROTO_TCP
);
1152 static inline int default_protocol_dgram(int protocol
)
1154 return (protocol
== IPPROTO_IP
|| protocol
== IPPROTO_UDP
);
1157 static inline u16
socket_type_to_security_class(int family
, int type
, int protocol
)
1163 case SOCK_SEQPACKET
:
1164 return SECCLASS_UNIX_STREAM_SOCKET
;
1166 return SECCLASS_UNIX_DGRAM_SOCKET
;
1173 if (default_protocol_stream(protocol
))
1174 return SECCLASS_TCP_SOCKET
;
1176 return SECCLASS_RAWIP_SOCKET
;
1178 if (default_protocol_dgram(protocol
))
1179 return SECCLASS_UDP_SOCKET
;
1181 return SECCLASS_RAWIP_SOCKET
;
1183 return SECCLASS_DCCP_SOCKET
;
1185 return SECCLASS_RAWIP_SOCKET
;
1191 return SECCLASS_NETLINK_ROUTE_SOCKET
;
1192 case NETLINK_FIREWALL
:
1193 return SECCLASS_NETLINK_FIREWALL_SOCKET
;
1194 case NETLINK_SOCK_DIAG
:
1195 return SECCLASS_NETLINK_TCPDIAG_SOCKET
;
1197 return SECCLASS_NETLINK_NFLOG_SOCKET
;
1199 return SECCLASS_NETLINK_XFRM_SOCKET
;
1200 case NETLINK_SELINUX
:
1201 return SECCLASS_NETLINK_SELINUX_SOCKET
;
1203 return SECCLASS_NETLINK_AUDIT_SOCKET
;
1204 case NETLINK_IP6_FW
:
1205 return SECCLASS_NETLINK_IP6FW_SOCKET
;
1206 case NETLINK_DNRTMSG
:
1207 return SECCLASS_NETLINK_DNRT_SOCKET
;
1208 case NETLINK_KOBJECT_UEVENT
:
1209 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET
;
1211 return SECCLASS_NETLINK_SOCKET
;
1214 return SECCLASS_PACKET_SOCKET
;
1216 return SECCLASS_KEY_SOCKET
;
1218 return SECCLASS_APPLETALK_SOCKET
;
1221 return SECCLASS_SOCKET
;
1224 #ifdef CONFIG_PROC_FS
1225 static int selinux_proc_get_sid(struct dentry
*dentry
,
1230 char *buffer
, *path
;
1232 buffer
= (char *)__get_free_page(GFP_KERNEL
);
1236 path
= dentry_path_raw(dentry
, buffer
, PAGE_SIZE
);
1240 /* each process gets a /proc/PID/ entry. Strip off the
1241 * PID part to get a valid selinux labeling.
1242 * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */
1243 while (path
[1] >= '0' && path
[1] <= '9') {
1247 rc
= security_genfs_sid("proc", path
, tclass
, sid
);
1249 free_page((unsigned long)buffer
);
1253 static int selinux_proc_get_sid(struct dentry
*dentry
,
1261 /* The inode's security attributes must be initialized before first use. */
1262 static int inode_doinit_with_dentry(struct inode
*inode
, struct dentry
*opt_dentry
)
1264 struct superblock_security_struct
*sbsec
= NULL
;
1265 struct inode_security_struct
*isec
= inode
->i_security
;
1267 struct dentry
*dentry
;
1268 #define INITCONTEXTLEN 255
1269 char *context
= NULL
;
1273 if (isec
->initialized
)
1276 mutex_lock(&isec
->lock
);
1277 if (isec
->initialized
)
1280 sbsec
= inode
->i_sb
->s_security
;
1281 if (!(sbsec
->flags
& SE_SBINITIALIZED
)) {
1282 /* Defer initialization until selinux_complete_init,
1283 after the initial policy is loaded and the security
1284 server is ready to handle calls. */
1285 spin_lock(&sbsec
->isec_lock
);
1286 if (list_empty(&isec
->list
))
1287 list_add(&isec
->list
, &sbsec
->isec_head
);
1288 spin_unlock(&sbsec
->isec_lock
);
1292 switch (sbsec
->behavior
) {
1293 case SECURITY_FS_USE_NATIVE
:
1295 case SECURITY_FS_USE_XATTR
:
1296 if (!inode
->i_op
->getxattr
) {
1297 isec
->sid
= sbsec
->def_sid
;
1301 /* Need a dentry, since the xattr API requires one.
1302 Life would be simpler if we could just pass the inode. */
1304 /* Called from d_instantiate or d_splice_alias. */
1305 dentry
= dget(opt_dentry
);
1307 /* Called from selinux_complete_init, try to find a dentry. */
1308 dentry
= d_find_alias(inode
);
1312 * this is can be hit on boot when a file is accessed
1313 * before the policy is loaded. When we load policy we
1314 * may find inodes that have no dentry on the
1315 * sbsec->isec_head list. No reason to complain as these
1316 * will get fixed up the next time we go through
1317 * inode_doinit with a dentry, before these inodes could
1318 * be used again by userspace.
1323 len
= INITCONTEXTLEN
;
1324 context
= kmalloc(len
+1, GFP_NOFS
);
1330 context
[len
] = '\0';
1331 rc
= inode
->i_op
->getxattr(dentry
, XATTR_NAME_SELINUX
,
1333 if (rc
== -ERANGE
) {
1336 /* Need a larger buffer. Query for the right size. */
1337 rc
= inode
->i_op
->getxattr(dentry
, XATTR_NAME_SELINUX
,
1344 context
= kmalloc(len
+1, GFP_NOFS
);
1350 context
[len
] = '\0';
1351 rc
= inode
->i_op
->getxattr(dentry
,
1357 if (rc
!= -ENODATA
) {
1358 printk(KERN_WARNING
"SELinux: %s: getxattr returned "
1359 "%d for dev=%s ino=%ld\n", __func__
,
1360 -rc
, inode
->i_sb
->s_id
, inode
->i_ino
);
1364 /* Map ENODATA to the default file SID */
1365 sid
= sbsec
->def_sid
;
1368 rc
= security_context_to_sid_default(context
, rc
, &sid
,
1372 char *dev
= inode
->i_sb
->s_id
;
1373 unsigned long ino
= inode
->i_ino
;
1375 if (rc
== -EINVAL
) {
1376 if (printk_ratelimit())
1377 printk(KERN_NOTICE
"SELinux: inode=%lu on dev=%s was found to have an invalid "
1378 "context=%s. This indicates you may need to relabel the inode or the "
1379 "filesystem in question.\n", ino
, dev
, context
);
1381 printk(KERN_WARNING
"SELinux: %s: context_to_sid(%s) "
1382 "returned %d for dev=%s ino=%ld\n",
1383 __func__
, context
, -rc
, dev
, ino
);
1386 /* Leave with the unlabeled SID */
1394 case SECURITY_FS_USE_TASK
:
1395 isec
->sid
= isec
->task_sid
;
1397 case SECURITY_FS_USE_TRANS
:
1398 /* Default to the fs SID. */
1399 isec
->sid
= sbsec
->sid
;
1401 /* Try to obtain a transition SID. */
1402 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
1403 rc
= security_transition_sid(isec
->task_sid
, sbsec
->sid
,
1404 isec
->sclass
, NULL
, &sid
);
1409 case SECURITY_FS_USE_MNTPOINT
:
1410 isec
->sid
= sbsec
->mntpoint_sid
;
1413 /* Default to the fs superblock SID. */
1414 isec
->sid
= sbsec
->sid
;
1416 if ((sbsec
->flags
& SE_SBPROC
) && !S_ISLNK(inode
->i_mode
)) {
1417 /* We must have a dentry to determine the label on
1420 /* Called from d_instantiate or
1421 * d_splice_alias. */
1422 dentry
= dget(opt_dentry
);
1424 /* Called from selinux_complete_init, try to
1426 dentry
= d_find_alias(inode
);
1428 * This can be hit on boot when a file is accessed
1429 * before the policy is loaded. When we load policy we
1430 * may find inodes that have no dentry on the
1431 * sbsec->isec_head list. No reason to complain as
1432 * these will get fixed up the next time we go through
1433 * inode_doinit() with a dentry, before these inodes
1434 * could be used again by userspace.
1438 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
1439 rc
= selinux_proc_get_sid(dentry
, isec
->sclass
, &sid
);
1448 isec
->initialized
= 1;
1451 mutex_unlock(&isec
->lock
);
1453 if (isec
->sclass
== SECCLASS_FILE
)
1454 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
1458 /* Convert a Linux signal to an access vector. */
1459 static inline u32
signal_to_av(int sig
)
1465 /* Commonly granted from child to parent. */
1466 perm
= PROCESS__SIGCHLD
;
1469 /* Cannot be caught or ignored */
1470 perm
= PROCESS__SIGKILL
;
1473 /* Cannot be caught or ignored */
1474 perm
= PROCESS__SIGSTOP
;
1477 /* All other signals. */
1478 perm
= PROCESS__SIGNAL
;
1486 * Check permission between a pair of credentials
1487 * fork check, ptrace check, etc.
1489 static int cred_has_perm(const struct cred
*actor
,
1490 const struct cred
*target
,
1493 u32 asid
= cred_sid(actor
), tsid
= cred_sid(target
);
1495 return avc_has_perm(asid
, tsid
, SECCLASS_PROCESS
, perms
, NULL
);
1499 * Check permission between a pair of tasks, e.g. signal checks,
1500 * fork check, ptrace check, etc.
1501 * tsk1 is the actor and tsk2 is the target
1502 * - this uses the default subjective creds of tsk1
1504 static int task_has_perm(const struct task_struct
*tsk1
,
1505 const struct task_struct
*tsk2
,
1508 const struct task_security_struct
*__tsec1
, *__tsec2
;
1512 __tsec1
= __task_cred(tsk1
)->security
; sid1
= __tsec1
->sid
;
1513 __tsec2
= __task_cred(tsk2
)->security
; sid2
= __tsec2
->sid
;
1515 return avc_has_perm(sid1
, sid2
, SECCLASS_PROCESS
, perms
, NULL
);
1519 * Check permission between current and another task, e.g. signal checks,
1520 * fork check, ptrace check, etc.
1521 * current is the actor and tsk2 is the target
1522 * - this uses current's subjective creds
1524 static int current_has_perm(const struct task_struct
*tsk
,
1529 sid
= current_sid();
1530 tsid
= task_sid(tsk
);
1531 return avc_has_perm(sid
, tsid
, SECCLASS_PROCESS
, perms
, NULL
);
1534 #if CAP_LAST_CAP > 63
1535 #error Fix SELinux to handle capabilities > 63.
1538 /* Check whether a task is allowed to use a capability. */
1539 static int cred_has_capability(const struct cred
*cred
,
1542 struct common_audit_data ad
;
1543 struct av_decision avd
;
1545 u32 sid
= cred_sid(cred
);
1546 u32 av
= CAP_TO_MASK(cap
);
1549 ad
.type
= LSM_AUDIT_DATA_CAP
;
1552 switch (CAP_TO_INDEX(cap
)) {
1554 sclass
= SECCLASS_CAPABILITY
;
1557 sclass
= SECCLASS_CAPABILITY2
;
1561 "SELinux: out of range capability %d\n", cap
);
1566 rc
= avc_has_perm_noaudit(sid
, sid
, sclass
, av
, 0, &avd
);
1567 if (audit
== SECURITY_CAP_AUDIT
) {
1568 int rc2
= avc_audit(sid
, sid
, sclass
, av
, &avd
, rc
, &ad
);
1575 /* Check whether a task is allowed to use a system operation. */
1576 static int task_has_system(struct task_struct
*tsk
,
1579 u32 sid
= task_sid(tsk
);
1581 return avc_has_perm(sid
, SECINITSID_KERNEL
,
1582 SECCLASS_SYSTEM
, perms
, NULL
);
1585 /* Check whether a task has a particular permission to an inode.
1586 The 'adp' parameter is optional and allows other audit
1587 data to be passed (e.g. the dentry). */
1588 static int inode_has_perm(const struct cred
*cred
,
1589 struct inode
*inode
,
1591 struct common_audit_data
*adp
)
1593 struct inode_security_struct
*isec
;
1596 validate_creds(cred
);
1598 if (unlikely(IS_PRIVATE(inode
)))
1601 sid
= cred_sid(cred
);
1602 isec
= inode
->i_security
;
1604 return avc_has_perm(sid
, isec
->sid
, isec
->sclass
, perms
, adp
);
1607 /* Same as inode_has_perm, but pass explicit audit data containing
1608 the dentry to help the auditing code to more easily generate the
1609 pathname if needed. */
1610 static inline int dentry_has_perm(const struct cred
*cred
,
1611 struct dentry
*dentry
,
1614 struct inode
*inode
= dentry
->d_inode
;
1615 struct common_audit_data ad
;
1617 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
1618 ad
.u
.dentry
= dentry
;
1619 return inode_has_perm(cred
, inode
, av
, &ad
);
1622 /* Same as inode_has_perm, but pass explicit audit data containing
1623 the path to help the auditing code to more easily generate the
1624 pathname if needed. */
1625 static inline int path_has_perm(const struct cred
*cred
,
1629 struct inode
*inode
= path
->dentry
->d_inode
;
1630 struct common_audit_data ad
;
1632 ad
.type
= LSM_AUDIT_DATA_PATH
;
1634 return inode_has_perm(cred
, inode
, av
, &ad
);
1637 /* Same as path_has_perm, but uses the inode from the file struct. */
1638 static inline int file_path_has_perm(const struct cred
*cred
,
1642 struct common_audit_data ad
;
1644 ad
.type
= LSM_AUDIT_DATA_PATH
;
1645 ad
.u
.path
= file
->f_path
;
1646 return inode_has_perm(cred
, file_inode(file
), av
, &ad
);
1649 /* Check whether a task can use an open file descriptor to
1650 access an inode in a given way. Check access to the
1651 descriptor itself, and then use dentry_has_perm to
1652 check a particular permission to the file.
1653 Access to the descriptor is implicitly granted if it
1654 has the same SID as the process. If av is zero, then
1655 access to the file is not checked, e.g. for cases
1656 where only the descriptor is affected like seek. */
1657 static int file_has_perm(const struct cred
*cred
,
1661 struct file_security_struct
*fsec
= file
->f_security
;
1662 struct inode
*inode
= file_inode(file
);
1663 struct common_audit_data ad
;
1664 u32 sid
= cred_sid(cred
);
1667 ad
.type
= LSM_AUDIT_DATA_PATH
;
1668 ad
.u
.path
= file
->f_path
;
1670 if (sid
!= fsec
->sid
) {
1671 rc
= avc_has_perm(sid
, fsec
->sid
,
1679 /* av is zero if only checking access to the descriptor. */
1682 rc
= inode_has_perm(cred
, inode
, av
, &ad
);
1688 /* Check whether a task can create a file. */
1689 static int may_create(struct inode
*dir
,
1690 struct dentry
*dentry
,
1693 const struct task_security_struct
*tsec
= current_security();
1694 struct inode_security_struct
*dsec
;
1695 struct superblock_security_struct
*sbsec
;
1697 struct common_audit_data ad
;
1700 dsec
= dir
->i_security
;
1701 sbsec
= dir
->i_sb
->s_security
;
1704 newsid
= tsec
->create_sid
;
1706 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
1707 ad
.u
.dentry
= dentry
;
1709 rc
= avc_has_perm(sid
, dsec
->sid
, SECCLASS_DIR
,
1710 DIR__ADD_NAME
| DIR__SEARCH
,
1715 if (!newsid
|| !(sbsec
->flags
& SBLABEL_MNT
)) {
1716 rc
= security_transition_sid(sid
, dsec
->sid
, tclass
,
1717 &dentry
->d_name
, &newsid
);
1722 rc
= avc_has_perm(sid
, newsid
, tclass
, FILE__CREATE
, &ad
);
1726 return avc_has_perm(newsid
, sbsec
->sid
,
1727 SECCLASS_FILESYSTEM
,
1728 FILESYSTEM__ASSOCIATE
, &ad
);
1731 /* Check whether a task can create a key. */
1732 static int may_create_key(u32 ksid
,
1733 struct task_struct
*ctx
)
1735 u32 sid
= task_sid(ctx
);
1737 return avc_has_perm(sid
, ksid
, SECCLASS_KEY
, KEY__CREATE
, NULL
);
1741 #define MAY_UNLINK 1
1744 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1745 static int may_link(struct inode
*dir
,
1746 struct dentry
*dentry
,
1750 struct inode_security_struct
*dsec
, *isec
;
1751 struct common_audit_data ad
;
1752 u32 sid
= current_sid();
1756 dsec
= dir
->i_security
;
1757 isec
= dentry
->d_inode
->i_security
;
1759 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
1760 ad
.u
.dentry
= dentry
;
1763 av
|= (kind
? DIR__REMOVE_NAME
: DIR__ADD_NAME
);
1764 rc
= avc_has_perm(sid
, dsec
->sid
, SECCLASS_DIR
, av
, &ad
);
1779 printk(KERN_WARNING
"SELinux: %s: unrecognized kind %d\n",
1784 rc
= avc_has_perm(sid
, isec
->sid
, isec
->sclass
, av
, &ad
);
1788 static inline int may_rename(struct inode
*old_dir
,
1789 struct dentry
*old_dentry
,
1790 struct inode
*new_dir
,
1791 struct dentry
*new_dentry
)
1793 struct inode_security_struct
*old_dsec
, *new_dsec
, *old_isec
, *new_isec
;
1794 struct common_audit_data ad
;
1795 u32 sid
= current_sid();
1797 int old_is_dir
, new_is_dir
;
1800 old_dsec
= old_dir
->i_security
;
1801 old_isec
= old_dentry
->d_inode
->i_security
;
1802 old_is_dir
= d_is_dir(old_dentry
);
1803 new_dsec
= new_dir
->i_security
;
1805 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
1807 ad
.u
.dentry
= old_dentry
;
1808 rc
= avc_has_perm(sid
, old_dsec
->sid
, SECCLASS_DIR
,
1809 DIR__REMOVE_NAME
| DIR__SEARCH
, &ad
);
1812 rc
= avc_has_perm(sid
, old_isec
->sid
,
1813 old_isec
->sclass
, FILE__RENAME
, &ad
);
1816 if (old_is_dir
&& new_dir
!= old_dir
) {
1817 rc
= avc_has_perm(sid
, old_isec
->sid
,
1818 old_isec
->sclass
, DIR__REPARENT
, &ad
);
1823 ad
.u
.dentry
= new_dentry
;
1824 av
= DIR__ADD_NAME
| DIR__SEARCH
;
1825 if (d_is_positive(new_dentry
))
1826 av
|= DIR__REMOVE_NAME
;
1827 rc
= avc_has_perm(sid
, new_dsec
->sid
, SECCLASS_DIR
, av
, &ad
);
1830 if (d_is_positive(new_dentry
)) {
1831 new_isec
= new_dentry
->d_inode
->i_security
;
1832 new_is_dir
= d_is_dir(new_dentry
);
1833 rc
= avc_has_perm(sid
, new_isec
->sid
,
1835 (new_is_dir
? DIR__RMDIR
: FILE__UNLINK
), &ad
);
1843 /* Check whether a task can perform a filesystem operation. */
1844 static int superblock_has_perm(const struct cred
*cred
,
1845 struct super_block
*sb
,
1847 struct common_audit_data
*ad
)
1849 struct superblock_security_struct
*sbsec
;
1850 u32 sid
= cred_sid(cred
);
1852 sbsec
= sb
->s_security
;
1853 return avc_has_perm(sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
, perms
, ad
);
1856 /* Convert a Linux mode and permission mask to an access vector. */
1857 static inline u32
file_mask_to_av(int mode
, int mask
)
1861 if (!S_ISDIR(mode
)) {
1862 if (mask
& MAY_EXEC
)
1863 av
|= FILE__EXECUTE
;
1864 if (mask
& MAY_READ
)
1867 if (mask
& MAY_APPEND
)
1869 else if (mask
& MAY_WRITE
)
1873 if (mask
& MAY_EXEC
)
1875 if (mask
& MAY_WRITE
)
1877 if (mask
& MAY_READ
)
1884 /* Convert a Linux file to an access vector. */
1885 static inline u32
file_to_av(struct file
*file
)
1889 if (file
->f_mode
& FMODE_READ
)
1891 if (file
->f_mode
& FMODE_WRITE
) {
1892 if (file
->f_flags
& O_APPEND
)
1899 * Special file opened with flags 3 for ioctl-only use.
1908 * Convert a file to an access vector and include the correct open
1911 static inline u32
open_file_to_av(struct file
*file
)
1913 u32 av
= file_to_av(file
);
1915 if (selinux_policycap_openperm
)
1921 /* Hook functions begin here. */
1923 static int selinux_binder_set_context_mgr(struct task_struct
*mgr
)
1925 u32 mysid
= current_sid();
1926 u32 mgrsid
= task_sid(mgr
);
1928 return avc_has_perm(mysid
, mgrsid
, SECCLASS_BINDER
,
1929 BINDER__SET_CONTEXT_MGR
, NULL
);
1932 static int selinux_binder_transaction(struct task_struct
*from
,
1933 struct task_struct
*to
)
1935 u32 mysid
= current_sid();
1936 u32 fromsid
= task_sid(from
);
1937 u32 tosid
= task_sid(to
);
1940 if (mysid
!= fromsid
) {
1941 rc
= avc_has_perm(mysid
, fromsid
, SECCLASS_BINDER
,
1942 BINDER__IMPERSONATE
, NULL
);
1947 return avc_has_perm(fromsid
, tosid
, SECCLASS_BINDER
, BINDER__CALL
,
1951 static int selinux_binder_transfer_binder(struct task_struct
*from
,
1952 struct task_struct
*to
)
1954 u32 fromsid
= task_sid(from
);
1955 u32 tosid
= task_sid(to
);
1957 return avc_has_perm(fromsid
, tosid
, SECCLASS_BINDER
, BINDER__TRANSFER
,
1961 static int selinux_binder_transfer_file(struct task_struct
*from
,
1962 struct task_struct
*to
,
1965 u32 sid
= task_sid(to
);
1966 struct file_security_struct
*fsec
= file
->f_security
;
1967 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1968 struct inode_security_struct
*isec
= inode
->i_security
;
1969 struct common_audit_data ad
;
1972 ad
.type
= LSM_AUDIT_DATA_PATH
;
1973 ad
.u
.path
= file
->f_path
;
1975 if (sid
!= fsec
->sid
) {
1976 rc
= avc_has_perm(sid
, fsec
->sid
,
1984 if (unlikely(IS_PRIVATE(inode
)))
1987 return avc_has_perm(sid
, isec
->sid
, isec
->sclass
, file_to_av(file
),
1991 static int selinux_ptrace_access_check(struct task_struct
*child
,
1996 rc
= cap_ptrace_access_check(child
, mode
);
2000 if (mode
& PTRACE_MODE_READ
) {
2001 u32 sid
= current_sid();
2002 u32 csid
= task_sid(child
);
2003 return avc_has_perm(sid
, csid
, SECCLASS_FILE
, FILE__READ
, NULL
);
2006 return current_has_perm(child
, PROCESS__PTRACE
);
2009 static int selinux_ptrace_traceme(struct task_struct
*parent
)
2013 rc
= cap_ptrace_traceme(parent
);
2017 return task_has_perm(parent
, current
, PROCESS__PTRACE
);
2020 static int selinux_capget(struct task_struct
*target
, kernel_cap_t
*effective
,
2021 kernel_cap_t
*inheritable
, kernel_cap_t
*permitted
)
2025 error
= current_has_perm(target
, PROCESS__GETCAP
);
2029 return cap_capget(target
, effective
, inheritable
, permitted
);
2032 static int selinux_capset(struct cred
*new, const struct cred
*old
,
2033 const kernel_cap_t
*effective
,
2034 const kernel_cap_t
*inheritable
,
2035 const kernel_cap_t
*permitted
)
2039 error
= cap_capset(new, old
,
2040 effective
, inheritable
, permitted
);
2044 return cred_has_perm(old
, new, PROCESS__SETCAP
);
2048 * (This comment used to live with the selinux_task_setuid hook,
2049 * which was removed).
2051 * Since setuid only affects the current process, and since the SELinux
2052 * controls are not based on the Linux identity attributes, SELinux does not
2053 * need to control this operation. However, SELinux does control the use of
2054 * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
2057 static int selinux_capable(const struct cred
*cred
, struct user_namespace
*ns
,
2062 rc
= cap_capable(cred
, ns
, cap
, audit
);
2066 return cred_has_capability(cred
, cap
, audit
);
2069 static int selinux_quotactl(int cmds
, int type
, int id
, struct super_block
*sb
)
2071 const struct cred
*cred
= current_cred();
2083 rc
= superblock_has_perm(cred
, sb
, FILESYSTEM__QUOTAMOD
, NULL
);
2088 rc
= superblock_has_perm(cred
, sb
, FILESYSTEM__QUOTAGET
, NULL
);
2091 rc
= 0; /* let the kernel handle invalid cmds */
2097 static int selinux_quota_on(struct dentry
*dentry
)
2099 const struct cred
*cred
= current_cred();
2101 return dentry_has_perm(cred
, dentry
, FILE__QUOTAON
);
2104 static int selinux_syslog(int type
)
2109 case SYSLOG_ACTION_READ_ALL
: /* Read last kernel messages */
2110 case SYSLOG_ACTION_SIZE_BUFFER
: /* Return size of the log buffer */
2111 rc
= task_has_system(current
, SYSTEM__SYSLOG_READ
);
2113 case SYSLOG_ACTION_CONSOLE_OFF
: /* Disable logging to console */
2114 case SYSLOG_ACTION_CONSOLE_ON
: /* Enable logging to console */
2115 /* Set level of messages printed to console */
2116 case SYSLOG_ACTION_CONSOLE_LEVEL
:
2117 rc
= task_has_system(current
, SYSTEM__SYSLOG_CONSOLE
);
2119 case SYSLOG_ACTION_CLOSE
: /* Close log */
2120 case SYSLOG_ACTION_OPEN
: /* Open log */
2121 case SYSLOG_ACTION_READ
: /* Read from log */
2122 case SYSLOG_ACTION_READ_CLEAR
: /* Read/clear last kernel messages */
2123 case SYSLOG_ACTION_CLEAR
: /* Clear ring buffer */
2125 rc
= task_has_system(current
, SYSTEM__SYSLOG_MOD
);
2132 * Check that a process has enough memory to allocate a new virtual
2133 * mapping. 0 means there is enough memory for the allocation to
2134 * succeed and -ENOMEM implies there is not.
2136 * Do not audit the selinux permission check, as this is applied to all
2137 * processes that allocate mappings.
2139 static int selinux_vm_enough_memory(struct mm_struct
*mm
, long pages
)
2141 int rc
, cap_sys_admin
= 0;
2143 rc
= selinux_capable(current_cred(), &init_user_ns
, CAP_SYS_ADMIN
,
2144 SECURITY_CAP_NOAUDIT
);
2148 return __vm_enough_memory(mm
, pages
, cap_sys_admin
);
2151 /* binprm security operations */
2153 static int check_nnp_nosuid(const struct linux_binprm
*bprm
,
2154 const struct task_security_struct
*old_tsec
,
2155 const struct task_security_struct
*new_tsec
)
2157 int nnp
= (bprm
->unsafe
& LSM_UNSAFE_NO_NEW_PRIVS
);
2158 int nosuid
= (bprm
->file
->f_path
.mnt
->mnt_flags
& MNT_NOSUID
);
2161 if (!nnp
&& !nosuid
)
2162 return 0; /* neither NNP nor nosuid */
2164 if (new_tsec
->sid
== old_tsec
->sid
)
2165 return 0; /* No change in credentials */
2168 * The only transitions we permit under NNP or nosuid
2169 * are transitions to bounded SIDs, i.e. SIDs that are
2170 * guaranteed to only be allowed a subset of the permissions
2171 * of the current SID.
2173 rc
= security_bounded_transition(old_tsec
->sid
, new_tsec
->sid
);
2176 * On failure, preserve the errno values for NNP vs nosuid.
2177 * NNP: Operation not permitted for caller.
2178 * nosuid: Permission denied to file.
2188 static int selinux_bprm_set_creds(struct linux_binprm
*bprm
)
2190 const struct task_security_struct
*old_tsec
;
2191 struct task_security_struct
*new_tsec
;
2192 struct inode_security_struct
*isec
;
2193 struct common_audit_data ad
;
2194 struct inode
*inode
= file_inode(bprm
->file
);
2197 rc
= cap_bprm_set_creds(bprm
);
2201 /* SELinux context only depends on initial program or script and not
2202 * the script interpreter */
2203 if (bprm
->cred_prepared
)
2206 old_tsec
= current_security();
2207 new_tsec
= bprm
->cred
->security
;
2208 isec
= inode
->i_security
;
2210 /* Default to the current task SID. */
2211 new_tsec
->sid
= old_tsec
->sid
;
2212 new_tsec
->osid
= old_tsec
->sid
;
2214 /* Reset fs, key, and sock SIDs on execve. */
2215 new_tsec
->create_sid
= 0;
2216 new_tsec
->keycreate_sid
= 0;
2217 new_tsec
->sockcreate_sid
= 0;
2219 if (old_tsec
->exec_sid
) {
2220 new_tsec
->sid
= old_tsec
->exec_sid
;
2221 /* Reset exec SID on execve. */
2222 new_tsec
->exec_sid
= 0;
2224 /* Fail on NNP or nosuid if not an allowed transition. */
2225 rc
= check_nnp_nosuid(bprm
, old_tsec
, new_tsec
);
2229 /* Check for a default transition on this program. */
2230 rc
= security_transition_sid(old_tsec
->sid
, isec
->sid
,
2231 SECCLASS_PROCESS
, NULL
,
2237 * Fallback to old SID on NNP or nosuid if not an allowed
2240 rc
= check_nnp_nosuid(bprm
, old_tsec
, new_tsec
);
2242 new_tsec
->sid
= old_tsec
->sid
;
2245 ad
.type
= LSM_AUDIT_DATA_PATH
;
2246 ad
.u
.path
= bprm
->file
->f_path
;
2248 if (new_tsec
->sid
== old_tsec
->sid
) {
2249 rc
= avc_has_perm(old_tsec
->sid
, isec
->sid
,
2250 SECCLASS_FILE
, FILE__EXECUTE_NO_TRANS
, &ad
);
2254 /* Check permissions for the transition. */
2255 rc
= avc_has_perm(old_tsec
->sid
, new_tsec
->sid
,
2256 SECCLASS_PROCESS
, PROCESS__TRANSITION
, &ad
);
2260 rc
= avc_has_perm(new_tsec
->sid
, isec
->sid
,
2261 SECCLASS_FILE
, FILE__ENTRYPOINT
, &ad
);
2265 /* Check for shared state */
2266 if (bprm
->unsafe
& LSM_UNSAFE_SHARE
) {
2267 rc
= avc_has_perm(old_tsec
->sid
, new_tsec
->sid
,
2268 SECCLASS_PROCESS
, PROCESS__SHARE
,
2274 /* Make sure that anyone attempting to ptrace over a task that
2275 * changes its SID has the appropriate permit */
2277 (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
2278 struct task_struct
*tracer
;
2279 struct task_security_struct
*sec
;
2283 tracer
= ptrace_parent(current
);
2284 if (likely(tracer
!= NULL
)) {
2285 sec
= __task_cred(tracer
)->security
;
2291 rc
= avc_has_perm(ptsid
, new_tsec
->sid
,
2293 PROCESS__PTRACE
, NULL
);
2299 /* Clear any possibly unsafe personality bits on exec: */
2300 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
2306 static int selinux_bprm_secureexec(struct linux_binprm
*bprm
)
2308 const struct task_security_struct
*tsec
= current_security();
2316 /* Enable secure mode for SIDs transitions unless
2317 the noatsecure permission is granted between
2318 the two SIDs, i.e. ahp returns 0. */
2319 atsecure
= avc_has_perm(osid
, sid
,
2321 PROCESS__NOATSECURE
, NULL
);
2324 return (atsecure
|| cap_bprm_secureexec(bprm
));
2327 static int match_file(const void *p
, struct file
*file
, unsigned fd
)
2329 return file_has_perm(p
, file
, file_to_av(file
)) ? fd
+ 1 : 0;
2332 /* Derived from fs/exec.c:flush_old_files. */
2333 static inline void flush_unauthorized_files(const struct cred
*cred
,
2334 struct files_struct
*files
)
2336 struct file
*file
, *devnull
= NULL
;
2337 struct tty_struct
*tty
;
2341 tty
= get_current_tty();
2343 spin_lock(&tty_files_lock
);
2344 if (!list_empty(&tty
->tty_files
)) {
2345 struct tty_file_private
*file_priv
;
2347 /* Revalidate access to controlling tty.
2348 Use file_path_has_perm on the tty path directly
2349 rather than using file_has_perm, as this particular
2350 open file may belong to another process and we are
2351 only interested in the inode-based check here. */
2352 file_priv
= list_first_entry(&tty
->tty_files
,
2353 struct tty_file_private
, list
);
2354 file
= file_priv
->file
;
2355 if (file_path_has_perm(cred
, file
, FILE__READ
| FILE__WRITE
))
2358 spin_unlock(&tty_files_lock
);
2361 /* Reset controlling tty. */
2365 /* Revalidate access to inherited open files. */
2366 n
= iterate_fd(files
, 0, match_file
, cred
);
2367 if (!n
) /* none found? */
2370 devnull
= dentry_open(&selinux_null
, O_RDWR
, cred
);
2371 if (IS_ERR(devnull
))
2373 /* replace all the matching ones with this */
2375 replace_fd(n
- 1, devnull
, 0);
2376 } while ((n
= iterate_fd(files
, n
, match_file
, cred
)) != 0);
2382 * Prepare a process for imminent new credential changes due to exec
2384 static void selinux_bprm_committing_creds(struct linux_binprm
*bprm
)
2386 struct task_security_struct
*new_tsec
;
2387 struct rlimit
*rlim
, *initrlim
;
2390 new_tsec
= bprm
->cred
->security
;
2391 if (new_tsec
->sid
== new_tsec
->osid
)
2394 /* Close files for which the new task SID is not authorized. */
2395 flush_unauthorized_files(bprm
->cred
, current
->files
);
2397 /* Always clear parent death signal on SID transitions. */
2398 current
->pdeath_signal
= 0;
2400 /* Check whether the new SID can inherit resource limits from the old
2401 * SID. If not, reset all soft limits to the lower of the current
2402 * task's hard limit and the init task's soft limit.
2404 * Note that the setting of hard limits (even to lower them) can be
2405 * controlled by the setrlimit check. The inclusion of the init task's
2406 * soft limit into the computation is to avoid resetting soft limits
2407 * higher than the default soft limit for cases where the default is
2408 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
2410 rc
= avc_has_perm(new_tsec
->osid
, new_tsec
->sid
, SECCLASS_PROCESS
,
2411 PROCESS__RLIMITINH
, NULL
);
2413 /* protect against do_prlimit() */
2415 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
2416 rlim
= current
->signal
->rlim
+ i
;
2417 initrlim
= init_task
.signal
->rlim
+ i
;
2418 rlim
->rlim_cur
= min(rlim
->rlim_max
, initrlim
->rlim_cur
);
2420 task_unlock(current
);
2421 update_rlimit_cpu(current
, rlimit(RLIMIT_CPU
));
2426 * Clean up the process immediately after the installation of new credentials
2429 static void selinux_bprm_committed_creds(struct linux_binprm
*bprm
)
2431 const struct task_security_struct
*tsec
= current_security();
2432 struct itimerval itimer
;
2442 /* Check whether the new SID can inherit signal state from the old SID.
2443 * If not, clear itimers to avoid subsequent signal generation and
2444 * flush and unblock signals.
2446 * This must occur _after_ the task SID has been updated so that any
2447 * kill done after the flush will be checked against the new SID.
2449 rc
= avc_has_perm(osid
, sid
, SECCLASS_PROCESS
, PROCESS__SIGINH
, NULL
);
2451 memset(&itimer
, 0, sizeof itimer
);
2452 for (i
= 0; i
< 3; i
++)
2453 do_setitimer(i
, &itimer
, NULL
);
2454 spin_lock_irq(¤t
->sighand
->siglock
);
2455 if (!(current
->signal
->flags
& SIGNAL_GROUP_EXIT
)) {
2456 __flush_signals(current
);
2457 flush_signal_handlers(current
, 1);
2458 sigemptyset(¤t
->blocked
);
2460 spin_unlock_irq(¤t
->sighand
->siglock
);
2463 /* Wake up the parent if it is waiting so that it can recheck
2464 * wait permission to the new task SID. */
2465 read_lock(&tasklist_lock
);
2466 __wake_up_parent(current
, current
->real_parent
);
2467 read_unlock(&tasklist_lock
);
2470 /* superblock security operations */
2472 static int selinux_sb_alloc_security(struct super_block
*sb
)
2474 return superblock_alloc_security(sb
);
2477 static void selinux_sb_free_security(struct super_block
*sb
)
2479 superblock_free_security(sb
);
2482 static inline int match_prefix(char *prefix
, int plen
, char *option
, int olen
)
2487 return !memcmp(prefix
, option
, plen
);
2490 static inline int selinux_option(char *option
, int len
)
2492 return (match_prefix(CONTEXT_STR
, sizeof(CONTEXT_STR
)-1, option
, len
) ||
2493 match_prefix(FSCONTEXT_STR
, sizeof(FSCONTEXT_STR
)-1, option
, len
) ||
2494 match_prefix(DEFCONTEXT_STR
, sizeof(DEFCONTEXT_STR
)-1, option
, len
) ||
2495 match_prefix(ROOTCONTEXT_STR
, sizeof(ROOTCONTEXT_STR
)-1, option
, len
) ||
2496 match_prefix(LABELSUPP_STR
, sizeof(LABELSUPP_STR
)-1, option
, len
));
2499 static inline void take_option(char **to
, char *from
, int *first
, int len
)
2506 memcpy(*to
, from
, len
);
2510 static inline void take_selinux_option(char **to
, char *from
, int *first
,
2513 int current_size
= 0;
2521 while (current_size
< len
) {
2531 static int selinux_sb_copy_data(char *orig
, char *copy
)
2533 int fnosec
, fsec
, rc
= 0;
2534 char *in_save
, *in_curr
, *in_end
;
2535 char *sec_curr
, *nosec_save
, *nosec
;
2541 nosec
= (char *)get_zeroed_page(GFP_KERNEL
);
2549 in_save
= in_end
= orig
;
2553 open_quote
= !open_quote
;
2554 if ((*in_end
== ',' && open_quote
== 0) ||
2556 int len
= in_end
- in_curr
;
2558 if (selinux_option(in_curr
, len
))
2559 take_selinux_option(&sec_curr
, in_curr
, &fsec
, len
);
2561 take_option(&nosec
, in_curr
, &fnosec
, len
);
2563 in_curr
= in_end
+ 1;
2565 } while (*in_end
++);
2567 strcpy(in_save
, nosec_save
);
2568 free_page((unsigned long)nosec_save
);
2573 static int selinux_sb_remount(struct super_block
*sb
, void *data
)
2576 struct security_mnt_opts opts
;
2577 char *secdata
, **mount_options
;
2578 struct superblock_security_struct
*sbsec
= sb
->s_security
;
2580 if (!(sbsec
->flags
& SE_SBINITIALIZED
))
2586 if (sb
->s_type
->fs_flags
& FS_BINARY_MOUNTDATA
)
2589 security_init_mnt_opts(&opts
);
2590 secdata
= alloc_secdata();
2593 rc
= selinux_sb_copy_data(data
, secdata
);
2595 goto out_free_secdata
;
2597 rc
= selinux_parse_opts_str(secdata
, &opts
);
2599 goto out_free_secdata
;
2601 mount_options
= opts
.mnt_opts
;
2602 flags
= opts
.mnt_opts_flags
;
2604 for (i
= 0; i
< opts
.num_mnt_opts
; i
++) {
2608 if (flags
[i
] == SBLABEL_MNT
)
2610 len
= strlen(mount_options
[i
]);
2611 rc
= security_context_to_sid(mount_options
[i
], len
, &sid
,
2614 printk(KERN_WARNING
"SELinux: security_context_to_sid"
2615 "(%s) failed for (dev %s, type %s) errno=%d\n",
2616 mount_options
[i
], sb
->s_id
, sb
->s_type
->name
, rc
);
2622 if (bad_option(sbsec
, FSCONTEXT_MNT
, sbsec
->sid
, sid
))
2623 goto out_bad_option
;
2626 if (bad_option(sbsec
, CONTEXT_MNT
, sbsec
->mntpoint_sid
, sid
))
2627 goto out_bad_option
;
2629 case ROOTCONTEXT_MNT
: {
2630 struct inode_security_struct
*root_isec
;
2631 root_isec
= sb
->s_root
->d_inode
->i_security
;
2633 if (bad_option(sbsec
, ROOTCONTEXT_MNT
, root_isec
->sid
, sid
))
2634 goto out_bad_option
;
2637 case DEFCONTEXT_MNT
:
2638 if (bad_option(sbsec
, DEFCONTEXT_MNT
, sbsec
->def_sid
, sid
))
2639 goto out_bad_option
;
2648 security_free_mnt_opts(&opts
);
2650 free_secdata(secdata
);
2653 printk(KERN_WARNING
"SELinux: unable to change security options "
2654 "during remount (dev %s, type=%s)\n", sb
->s_id
,
2659 static int selinux_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
2661 const struct cred
*cred
= current_cred();
2662 struct common_audit_data ad
;
2665 rc
= superblock_doinit(sb
, data
);
2669 /* Allow all mounts performed by the kernel */
2670 if (flags
& MS_KERNMOUNT
)
2673 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
2674 ad
.u
.dentry
= sb
->s_root
;
2675 return superblock_has_perm(cred
, sb
, FILESYSTEM__MOUNT
, &ad
);
2678 static int selinux_sb_statfs(struct dentry
*dentry
)
2680 const struct cred
*cred
= current_cred();
2681 struct common_audit_data ad
;
2683 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
2684 ad
.u
.dentry
= dentry
->d_sb
->s_root
;
2685 return superblock_has_perm(cred
, dentry
->d_sb
, FILESYSTEM__GETATTR
, &ad
);
2688 static int selinux_mount(const char *dev_name
,
2691 unsigned long flags
,
2694 const struct cred
*cred
= current_cred();
2696 if (flags
& MS_REMOUNT
)
2697 return superblock_has_perm(cred
, path
->dentry
->d_sb
,
2698 FILESYSTEM__REMOUNT
, NULL
);
2700 return path_has_perm(cred
, path
, FILE__MOUNTON
);
2703 static int selinux_umount(struct vfsmount
*mnt
, int flags
)
2705 const struct cred
*cred
= current_cred();
2707 return superblock_has_perm(cred
, mnt
->mnt_sb
,
2708 FILESYSTEM__UNMOUNT
, NULL
);
2711 /* inode security operations */
2713 static int selinux_inode_alloc_security(struct inode
*inode
)
2715 return inode_alloc_security(inode
);
2718 static void selinux_inode_free_security(struct inode
*inode
)
2720 inode_free_security(inode
);
2723 static int selinux_dentry_init_security(struct dentry
*dentry
, int mode
,
2724 struct qstr
*name
, void **ctx
,
2727 const struct cred
*cred
= current_cred();
2728 struct task_security_struct
*tsec
;
2729 struct inode_security_struct
*dsec
;
2730 struct superblock_security_struct
*sbsec
;
2731 struct inode
*dir
= dentry
->d_parent
->d_inode
;
2735 tsec
= cred
->security
;
2736 dsec
= dir
->i_security
;
2737 sbsec
= dir
->i_sb
->s_security
;
2739 if (tsec
->create_sid
&& sbsec
->behavior
!= SECURITY_FS_USE_MNTPOINT
) {
2740 newsid
= tsec
->create_sid
;
2742 rc
= security_transition_sid(tsec
->sid
, dsec
->sid
,
2743 inode_mode_to_security_class(mode
),
2748 "%s: security_transition_sid failed, rc=%d\n",
2754 return security_sid_to_context(newsid
, (char **)ctx
, ctxlen
);
2757 static int selinux_inode_init_security(struct inode
*inode
, struct inode
*dir
,
2758 const struct qstr
*qstr
,
2760 void **value
, size_t *len
)
2762 const struct task_security_struct
*tsec
= current_security();
2763 struct inode_security_struct
*dsec
;
2764 struct superblock_security_struct
*sbsec
;
2765 u32 sid
, newsid
, clen
;
2769 dsec
= dir
->i_security
;
2770 sbsec
= dir
->i_sb
->s_security
;
2773 newsid
= tsec
->create_sid
;
2775 if ((sbsec
->flags
& SE_SBINITIALIZED
) &&
2776 (sbsec
->behavior
== SECURITY_FS_USE_MNTPOINT
))
2777 newsid
= sbsec
->mntpoint_sid
;
2778 else if (!newsid
|| !(sbsec
->flags
& SBLABEL_MNT
)) {
2779 rc
= security_transition_sid(sid
, dsec
->sid
,
2780 inode_mode_to_security_class(inode
->i_mode
),
2783 printk(KERN_WARNING
"%s: "
2784 "security_transition_sid failed, rc=%d (dev=%s "
2787 -rc
, inode
->i_sb
->s_id
, inode
->i_ino
);
2792 /* Possibly defer initialization to selinux_complete_init. */
2793 if (sbsec
->flags
& SE_SBINITIALIZED
) {
2794 struct inode_security_struct
*isec
= inode
->i_security
;
2795 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
2797 isec
->initialized
= 1;
2800 if (!ss_initialized
|| !(sbsec
->flags
& SBLABEL_MNT
))
2804 *name
= XATTR_SELINUX_SUFFIX
;
2807 rc
= security_sid_to_context_force(newsid
, &context
, &clen
);
2817 static int selinux_inode_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
2819 return may_create(dir
, dentry
, SECCLASS_FILE
);
2822 static int selinux_inode_link(struct dentry
*old_dentry
, struct inode
*dir
, struct dentry
*new_dentry
)
2824 return may_link(dir
, old_dentry
, MAY_LINK
);
2827 static int selinux_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
2829 return may_link(dir
, dentry
, MAY_UNLINK
);
2832 static int selinux_inode_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *name
)
2834 return may_create(dir
, dentry
, SECCLASS_LNK_FILE
);
2837 static int selinux_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mask
)
2839 return may_create(dir
, dentry
, SECCLASS_DIR
);
2842 static int selinux_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2844 return may_link(dir
, dentry
, MAY_RMDIR
);
2847 static int selinux_inode_mknod(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, dev_t dev
)
2849 return may_create(dir
, dentry
, inode_mode_to_security_class(mode
));
2852 static int selinux_inode_rename(struct inode
*old_inode
, struct dentry
*old_dentry
,
2853 struct inode
*new_inode
, struct dentry
*new_dentry
)
2855 return may_rename(old_inode
, old_dentry
, new_inode
, new_dentry
);
2858 static int selinux_inode_readlink(struct dentry
*dentry
)
2860 const struct cred
*cred
= current_cred();
2862 return dentry_has_perm(cred
, dentry
, FILE__READ
);
2865 static int selinux_inode_follow_link(struct dentry
*dentry
, struct nameidata
*nameidata
)
2867 const struct cred
*cred
= current_cred();
2869 return dentry_has_perm(cred
, dentry
, FILE__READ
);
2872 static noinline
int audit_inode_permission(struct inode
*inode
,
2873 u32 perms
, u32 audited
, u32 denied
,
2877 struct common_audit_data ad
;
2878 struct inode_security_struct
*isec
= inode
->i_security
;
2881 ad
.type
= LSM_AUDIT_DATA_INODE
;
2884 rc
= slow_avc_audit(current_sid(), isec
->sid
, isec
->sclass
, perms
,
2885 audited
, denied
, result
, &ad
, flags
);
2891 static int selinux_inode_permission(struct inode
*inode
, int mask
)
2893 const struct cred
*cred
= current_cred();
2896 unsigned flags
= mask
& MAY_NOT_BLOCK
;
2897 struct inode_security_struct
*isec
;
2899 struct av_decision avd
;
2901 u32 audited
, denied
;
2903 from_access
= mask
& MAY_ACCESS
;
2904 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
2906 /* No permission to check. Existence test. */
2910 validate_creds(cred
);
2912 if (unlikely(IS_PRIVATE(inode
)))
2915 perms
= file_mask_to_av(inode
->i_mode
, mask
);
2917 sid
= cred_sid(cred
);
2918 isec
= inode
->i_security
;
2920 rc
= avc_has_perm_noaudit(sid
, isec
->sid
, isec
->sclass
, perms
, 0, &avd
);
2921 audited
= avc_audit_required(perms
, &avd
, rc
,
2922 from_access
? FILE__AUDIT_ACCESS
: 0,
2924 if (likely(!audited
))
2927 rc2
= audit_inode_permission(inode
, perms
, audited
, denied
, rc
, flags
);
2933 static int selinux_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
2935 const struct cred
*cred
= current_cred();
2936 unsigned int ia_valid
= iattr
->ia_valid
;
2937 __u32 av
= FILE__WRITE
;
2939 /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */
2940 if (ia_valid
& ATTR_FORCE
) {
2941 ia_valid
&= ~(ATTR_KILL_SUID
| ATTR_KILL_SGID
| ATTR_MODE
|
2947 if (ia_valid
& (ATTR_MODE
| ATTR_UID
| ATTR_GID
|
2948 ATTR_ATIME_SET
| ATTR_MTIME_SET
| ATTR_TIMES_SET
))
2949 return dentry_has_perm(cred
, dentry
, FILE__SETATTR
);
2951 if (selinux_policycap_openperm
&& (ia_valid
& ATTR_SIZE
))
2954 return dentry_has_perm(cred
, dentry
, av
);
2957 static int selinux_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
2959 const struct cred
*cred
= current_cred();
2962 path
.dentry
= dentry
;
2965 return path_has_perm(cred
, &path
, FILE__GETATTR
);
2968 static int selinux_inode_setotherxattr(struct dentry
*dentry
, const char *name
)
2970 const struct cred
*cred
= current_cred();
2972 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
2973 sizeof XATTR_SECURITY_PREFIX
- 1)) {
2974 if (!strcmp(name
, XATTR_NAME_CAPS
)) {
2975 if (!capable(CAP_SETFCAP
))
2977 } else if (!capable(CAP_SYS_ADMIN
)) {
2978 /* A different attribute in the security namespace.
2979 Restrict to administrator. */
2984 /* Not an attribute we recognize, so just check the
2985 ordinary setattr permission. */
2986 return dentry_has_perm(cred
, dentry
, FILE__SETATTR
);
2989 static int selinux_inode_setxattr(struct dentry
*dentry
, const char *name
,
2990 const void *value
, size_t size
, int flags
)
2992 struct inode
*inode
= dentry
->d_inode
;
2993 struct inode_security_struct
*isec
= inode
->i_security
;
2994 struct superblock_security_struct
*sbsec
;
2995 struct common_audit_data ad
;
2996 u32 newsid
, sid
= current_sid();
2999 if (strcmp(name
, XATTR_NAME_SELINUX
))
3000 return selinux_inode_setotherxattr(dentry
, name
);
3002 sbsec
= inode
->i_sb
->s_security
;
3003 if (!(sbsec
->flags
& SBLABEL_MNT
))
3006 if (!inode_owner_or_capable(inode
))
3009 ad
.type
= LSM_AUDIT_DATA_DENTRY
;
3010 ad
.u
.dentry
= dentry
;
3012 rc
= avc_has_perm(sid
, isec
->sid
, isec
->sclass
,
3013 FILE__RELABELFROM
, &ad
);
3017 rc
= security_context_to_sid(value
, size
, &newsid
, GFP_KERNEL
);
3018 if (rc
== -EINVAL
) {
3019 if (!capable(CAP_MAC_ADMIN
)) {
3020 struct audit_buffer
*ab
;
3024 /* We strip a nul only if it is at the end, otherwise the
3025 * context contains a nul and we should audit that */
3028 if (str
[size
- 1] == '\0')
3029 audit_size
= size
- 1;
3036 ab
= audit_log_start(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
);
3037 audit_log_format(ab
, "op=setxattr invalid_context=");
3038 audit_log_n_untrustedstring(ab
, value
, audit_size
);
3043 rc
= security_context_to_sid_force(value
, size
, &newsid
);
3048 rc
= avc_has_perm(sid
, newsid
, isec
->sclass
,
3049 FILE__RELABELTO
, &ad
);
3053 rc
= security_validate_transition(isec
->sid
, newsid
, sid
,
3058 return avc_has_perm(newsid
,
3060 SECCLASS_FILESYSTEM
,
3061 FILESYSTEM__ASSOCIATE
,
3065 static void selinux_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
3066 const void *value
, size_t size
,
3069 struct inode
*inode
= dentry
->d_inode
;
3070 struct inode_security_struct
*isec
= inode
->i_security
;
3074 if (strcmp(name
, XATTR_NAME_SELINUX
)) {
3075 /* Not an attribute we recognize, so nothing to do. */
3079 rc
= security_context_to_sid_force(value
, size
, &newsid
);
3081 printk(KERN_ERR
"SELinux: unable to map context to SID"
3082 "for (%s, %lu), rc=%d\n",
3083 inode
->i_sb
->s_id
, inode
->i_ino
, -rc
);
3087 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
3089 isec
->initialized
= 1;
3094 static int selinux_inode_getxattr(struct dentry
*dentry
, const char *name
)
3096 const struct cred
*cred
= current_cred();
3098 return dentry_has_perm(cred
, dentry
, FILE__GETATTR
);
3101 static int selinux_inode_listxattr(struct dentry
*dentry
)
3103 const struct cred
*cred
= current_cred();
3105 return dentry_has_perm(cred
, dentry
, FILE__GETATTR
);
3108 static int selinux_inode_removexattr(struct dentry
*dentry
, const char *name
)
3110 if (strcmp(name
, XATTR_NAME_SELINUX
))
3111 return selinux_inode_setotherxattr(dentry
, name
);
3113 /* No one is allowed to remove a SELinux security label.
3114 You can change the label, but all data must be labeled. */
3119 * Copy the inode security context value to the user.
3121 * Permission check is handled by selinux_inode_getxattr hook.
3123 static int selinux_inode_getsecurity(const struct inode
*inode
, const char *name
, void **buffer
, bool alloc
)
3127 char *context
= NULL
;
3128 struct inode_security_struct
*isec
= inode
->i_security
;
3130 if (strcmp(name
, XATTR_SELINUX_SUFFIX
))
3134 * If the caller has CAP_MAC_ADMIN, then get the raw context
3135 * value even if it is not defined by current policy; otherwise,
3136 * use the in-core value under current policy.
3137 * Use the non-auditing forms of the permission checks since
3138 * getxattr may be called by unprivileged processes commonly
3139 * and lack of permission just means that we fall back to the
3140 * in-core context value, not a denial.
3142 error
= selinux_capable(current_cred(), &init_user_ns
, CAP_MAC_ADMIN
,
3143 SECURITY_CAP_NOAUDIT
);
3145 error
= security_sid_to_context_force(isec
->sid
, &context
,
3148 error
= security_sid_to_context(isec
->sid
, &context
, &size
);
3161 static int selinux_inode_setsecurity(struct inode
*inode
, const char *name
,
3162 const void *value
, size_t size
, int flags
)
3164 struct inode_security_struct
*isec
= inode
->i_security
;
3168 if (strcmp(name
, XATTR_SELINUX_SUFFIX
))
3171 if (!value
|| !size
)
3174 rc
= security_context_to_sid((void *)value
, size
, &newsid
, GFP_KERNEL
);
3178 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
3180 isec
->initialized
= 1;
3184 static int selinux_inode_listsecurity(struct inode
*inode
, char *buffer
, size_t buffer_size
)
3186 const int len
= sizeof(XATTR_NAME_SELINUX
);
3187 if (buffer
&& len
<= buffer_size
)
3188 memcpy(buffer
, XATTR_NAME_SELINUX
, len
);
3192 static void selinux_inode_getsecid(const struct inode
*inode
, u32
*secid
)
3194 struct inode_security_struct
*isec
= inode
->i_security
;
3198 /* file security operations */
3200 static int selinux_revalidate_file_permission(struct file
*file
, int mask
)
3202 const struct cred
*cred
= current_cred();
3203 struct inode
*inode
= file_inode(file
);
3205 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
3206 if ((file
->f_flags
& O_APPEND
) && (mask
& MAY_WRITE
))
3209 return file_has_perm(cred
, file
,
3210 file_mask_to_av(inode
->i_mode
, mask
));
3213 static int selinux_file_permission(struct file
*file
, int mask
)
3215 struct inode
*inode
= file_inode(file
);
3216 struct file_security_struct
*fsec
= file
->f_security
;
3217 struct inode_security_struct
*isec
= inode
->i_security
;
3218 u32 sid
= current_sid();
3221 /* No permission to check. Existence test. */
3224 if (sid
== fsec
->sid
&& fsec
->isid
== isec
->sid
&&
3225 fsec
->pseqno
== avc_policy_seqno())
3226 /* No change since file_open check. */
3229 return selinux_revalidate_file_permission(file
, mask
);
3232 static int selinux_file_alloc_security(struct file
*file
)
3234 return file_alloc_security(file
);
3237 static void selinux_file_free_security(struct file
*file
)
3239 file_free_security(file
);
3242 static int selinux_file_ioctl(struct file
*file
, unsigned int cmd
,
3245 const struct cred
*cred
= current_cred();
3255 case FS_IOC_GETFLAGS
:
3257 case FS_IOC_GETVERSION
:
3258 error
= file_has_perm(cred
, file
, FILE__GETATTR
);
3261 case FS_IOC_SETFLAGS
:
3263 case FS_IOC_SETVERSION
:
3264 error
= file_has_perm(cred
, file
, FILE__SETATTR
);
3267 /* sys_ioctl() checks */
3271 error
= file_has_perm(cred
, file
, 0);
3276 error
= cred_has_capability(cred
, CAP_SYS_TTY_CONFIG
,
3277 SECURITY_CAP_AUDIT
);
3280 /* default case assumes that the command will go
3281 * to the file's ioctl() function.
3284 error
= file_has_perm(cred
, file
, FILE__IOCTL
);
3289 static int default_noexec
;
3291 static int file_map_prot_check(struct file
*file
, unsigned long prot
, int shared
)
3293 const struct cred
*cred
= current_cred();
3296 if (default_noexec
&&
3297 (prot
& PROT_EXEC
) && (!file
|| (!shared
&& (prot
& PROT_WRITE
)))) {
3299 * We are making executable an anonymous mapping or a
3300 * private file mapping that will also be writable.
3301 * This has an additional check.
3303 rc
= cred_has_perm(cred
, cred
, PROCESS__EXECMEM
);
3309 /* read access is always possible with a mapping */
3310 u32 av
= FILE__READ
;
3312 /* write access only matters if the mapping is shared */
3313 if (shared
&& (prot
& PROT_WRITE
))
3316 if (prot
& PROT_EXEC
)
3317 av
|= FILE__EXECUTE
;
3319 return file_has_perm(cred
, file
, av
);
3326 static int selinux_mmap_addr(unsigned long addr
)
3330 /* do DAC check on address space usage */
3331 rc
= cap_mmap_addr(addr
);
3335 if (addr
< CONFIG_LSM_MMAP_MIN_ADDR
) {
3336 u32 sid
= current_sid();
3337 rc
= avc_has_perm(sid
, sid
, SECCLASS_MEMPROTECT
,
3338 MEMPROTECT__MMAP_ZERO
, NULL
);
3344 static int selinux_mmap_file(struct file
*file
, unsigned long reqprot
,
3345 unsigned long prot
, unsigned long flags
)
3347 if (selinux_checkreqprot
)
3350 return file_map_prot_check(file
, prot
,
3351 (flags
& MAP_TYPE
) == MAP_SHARED
);
3354 static int selinux_file_mprotect(struct vm_area_struct
*vma
,
3355 unsigned long reqprot
,
3358 const struct cred
*cred
= current_cred();
3360 if (selinux_checkreqprot
)
3363 if (default_noexec
&&
3364 (prot
& PROT_EXEC
) && !(vma
->vm_flags
& VM_EXEC
)) {
3366 if (vma
->vm_start
>= vma
->vm_mm
->start_brk
&&
3367 vma
->vm_end
<= vma
->vm_mm
->brk
) {
3368 rc
= cred_has_perm(cred
, cred
, PROCESS__EXECHEAP
);
3369 } else if (!vma
->vm_file
&&
3370 vma
->vm_start
<= vma
->vm_mm
->start_stack
&&
3371 vma
->vm_end
>= vma
->vm_mm
->start_stack
) {
3372 rc
= current_has_perm(current
, PROCESS__EXECSTACK
);
3373 } else if (vma
->vm_file
&& vma
->anon_vma
) {
3375 * We are making executable a file mapping that has
3376 * had some COW done. Since pages might have been
3377 * written, check ability to execute the possibly
3378 * modified content. This typically should only
3379 * occur for text relocations.
3381 rc
= file_has_perm(cred
, vma
->vm_file
, FILE__EXECMOD
);
3387 return file_map_prot_check(vma
->vm_file
, prot
, vma
->vm_flags
&VM_SHARED
);
3390 static int selinux_file_lock(struct file
*file
, unsigned int cmd
)
3392 const struct cred
*cred
= current_cred();
3394 return file_has_perm(cred
, file
, FILE__LOCK
);
3397 static int selinux_file_fcntl(struct file
*file
, unsigned int cmd
,
3400 const struct cred
*cred
= current_cred();
3405 if ((file
->f_flags
& O_APPEND
) && !(arg
& O_APPEND
)) {
3406 err
= file_has_perm(cred
, file
, FILE__WRITE
);
3415 case F_GETOWNER_UIDS
:
3416 /* Just check FD__USE permission */
3417 err
= file_has_perm(cred
, file
, 0);
3425 #if BITS_PER_LONG == 32
3430 err
= file_has_perm(cred
, file
, FILE__LOCK
);
3437 static void selinux_file_set_fowner(struct file
*file
)
3439 struct file_security_struct
*fsec
;
3441 fsec
= file
->f_security
;
3442 fsec
->fown_sid
= current_sid();
3445 static int selinux_file_send_sigiotask(struct task_struct
*tsk
,
3446 struct fown_struct
*fown
, int signum
)
3449 u32 sid
= task_sid(tsk
);
3451 struct file_security_struct
*fsec
;
3453 /* struct fown_struct is never outside the context of a struct file */
3454 file
= container_of(fown
, struct file
, f_owner
);
3456 fsec
= file
->f_security
;
3459 perm
= signal_to_av(SIGIO
); /* as per send_sigio_to_task */
3461 perm
= signal_to_av(signum
);
3463 return avc_has_perm(fsec
->fown_sid
, sid
,
3464 SECCLASS_PROCESS
, perm
, NULL
);
3467 static int selinux_file_receive(struct file
*file
)
3469 const struct cred
*cred
= current_cred();
3471 return file_has_perm(cred
, file
, file_to_av(file
));
3474 static int selinux_file_open(struct file
*file
, const struct cred
*cred
)
3476 struct file_security_struct
*fsec
;
3477 struct inode_security_struct
*isec
;
3479 fsec
= file
->f_security
;
3480 isec
= file_inode(file
)->i_security
;
3482 * Save inode label and policy sequence number
3483 * at open-time so that selinux_file_permission
3484 * can determine whether revalidation is necessary.
3485 * Task label is already saved in the file security
3486 * struct as its SID.
3488 fsec
->isid
= isec
->sid
;
3489 fsec
->pseqno
= avc_policy_seqno();
3491 * Since the inode label or policy seqno may have changed
3492 * between the selinux_inode_permission check and the saving
3493 * of state above, recheck that access is still permitted.
3494 * Otherwise, access might never be revalidated against the
3495 * new inode label or new policy.
3496 * This check is not redundant - do not remove.
3498 return file_path_has_perm(cred
, file
, open_file_to_av(file
));
3501 /* task security operations */
3503 static int selinux_task_create(unsigned long clone_flags
)
3505 return current_has_perm(current
, PROCESS__FORK
);
3509 * allocate the SELinux part of blank credentials
3511 static int selinux_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
3513 struct task_security_struct
*tsec
;
3515 tsec
= kzalloc(sizeof(struct task_security_struct
), gfp
);
3519 cred
->security
= tsec
;
3524 * detach and free the LSM part of a set of credentials
3526 static void selinux_cred_free(struct cred
*cred
)
3528 struct task_security_struct
*tsec
= cred
->security
;
3531 * cred->security == NULL if security_cred_alloc_blank() or
3532 * security_prepare_creds() returned an error.
3534 BUG_ON(cred
->security
&& (unsigned long) cred
->security
< PAGE_SIZE
);
3535 cred
->security
= (void *) 0x7UL
;
3540 * prepare a new set of credentials for modification
3542 static int selinux_cred_prepare(struct cred
*new, const struct cred
*old
,
3545 const struct task_security_struct
*old_tsec
;
3546 struct task_security_struct
*tsec
;
3548 old_tsec
= old
->security
;
3550 tsec
= kmemdup(old_tsec
, sizeof(struct task_security_struct
), gfp
);
3554 new->security
= tsec
;
3559 * transfer the SELinux data to a blank set of creds
3561 static void selinux_cred_transfer(struct cred
*new, const struct cred
*old
)
3563 const struct task_security_struct
*old_tsec
= old
->security
;
3564 struct task_security_struct
*tsec
= new->security
;
3570 * set the security data for a kernel service
3571 * - all the creation contexts are set to unlabelled
3573 static int selinux_kernel_act_as(struct cred
*new, u32 secid
)
3575 struct task_security_struct
*tsec
= new->security
;
3576 u32 sid
= current_sid();
3579 ret
= avc_has_perm(sid
, secid
,
3580 SECCLASS_KERNEL_SERVICE
,
3581 KERNEL_SERVICE__USE_AS_OVERRIDE
,
3585 tsec
->create_sid
= 0;
3586 tsec
->keycreate_sid
= 0;
3587 tsec
->sockcreate_sid
= 0;
3593 * set the file creation context in a security record to the same as the
3594 * objective context of the specified inode
3596 static int selinux_kernel_create_files_as(struct cred
*new, struct inode
*inode
)
3598 struct inode_security_struct
*isec
= inode
->i_security
;
3599 struct task_security_struct
*tsec
= new->security
;
3600 u32 sid
= current_sid();
3603 ret
= avc_has_perm(sid
, isec
->sid
,
3604 SECCLASS_KERNEL_SERVICE
,
3605 KERNEL_SERVICE__CREATE_FILES_AS
,
3609 tsec
->create_sid
= isec
->sid
;
3613 static int selinux_kernel_module_request(char *kmod_name
)
3616 struct common_audit_data ad
;
3618 sid
= task_sid(current
);
3620 ad
.type
= LSM_AUDIT_DATA_KMOD
;
3621 ad
.u
.kmod_name
= kmod_name
;
3623 return avc_has_perm(sid
, SECINITSID_KERNEL
, SECCLASS_SYSTEM
,
3624 SYSTEM__MODULE_REQUEST
, &ad
);
3627 static int selinux_task_setpgid(struct task_struct
*p
, pid_t pgid
)
3629 return current_has_perm(p
, PROCESS__SETPGID
);
3632 static int selinux_task_getpgid(struct task_struct
*p
)
3634 return current_has_perm(p
, PROCESS__GETPGID
);
3637 static int selinux_task_getsid(struct task_struct
*p
)
3639 return current_has_perm(p
, PROCESS__GETSESSION
);
3642 static void selinux_task_getsecid(struct task_struct
*p
, u32
*secid
)
3644 *secid
= task_sid(p
);
3647 static int selinux_task_setnice(struct task_struct
*p
, int nice
)
3651 rc
= cap_task_setnice(p
, nice
);
3655 return current_has_perm(p
, PROCESS__SETSCHED
);
3658 static int selinux_task_setioprio(struct task_struct
*p
, int ioprio
)
3662 rc
= cap_task_setioprio(p
, ioprio
);
3666 return current_has_perm(p
, PROCESS__SETSCHED
);
3669 static int selinux_task_getioprio(struct task_struct
*p
)
3671 return current_has_perm(p
, PROCESS__GETSCHED
);
3674 static int selinux_task_setrlimit(struct task_struct
*p
, unsigned int resource
,
3675 struct rlimit
*new_rlim
)
3677 struct rlimit
*old_rlim
= p
->signal
->rlim
+ resource
;
3679 /* Control the ability to change the hard limit (whether
3680 lowering or raising it), so that the hard limit can
3681 later be used as a safe reset point for the soft limit
3682 upon context transitions. See selinux_bprm_committing_creds. */
3683 if (old_rlim
->rlim_max
!= new_rlim
->rlim_max
)
3684 return current_has_perm(p
, PROCESS__SETRLIMIT
);
3689 static int selinux_task_setscheduler(struct task_struct
*p
)
3693 rc
= cap_task_setscheduler(p
);
3697 return current_has_perm(p
, PROCESS__SETSCHED
);
3700 static int selinux_task_getscheduler(struct task_struct
*p
)
3702 return current_has_perm(p
, PROCESS__GETSCHED
);
3705 static int selinux_task_movememory(struct task_struct
*p
)
3707 return current_has_perm(p
, PROCESS__SETSCHED
);
3710 static int selinux_task_kill(struct task_struct
*p
, struct siginfo
*info
,
3717 perm
= PROCESS__SIGNULL
; /* null signal; existence test */
3719 perm
= signal_to_av(sig
);
3721 rc
= avc_has_perm(secid
, task_sid(p
),
3722 SECCLASS_PROCESS
, perm
, NULL
);
3724 rc
= current_has_perm(p
, perm
);
3728 static int selinux_task_wait(struct task_struct
*p
)
3730 return task_has_perm(p
, current
, PROCESS__SIGCHLD
);
3733 static void selinux_task_to_inode(struct task_struct
*p
,
3734 struct inode
*inode
)
3736 struct inode_security_struct
*isec
= inode
->i_security
;
3737 u32 sid
= task_sid(p
);
3740 isec
->initialized
= 1;
3743 /* Returns error only if unable to parse addresses */
3744 static int selinux_parse_skb_ipv4(struct sk_buff
*skb
,
3745 struct common_audit_data
*ad
, u8
*proto
)
3747 int offset
, ihlen
, ret
= -EINVAL
;
3748 struct iphdr _iph
, *ih
;
3750 offset
= skb_network_offset(skb
);
3751 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
3755 ihlen
= ih
->ihl
* 4;
3756 if (ihlen
< sizeof(_iph
))
3759 ad
->u
.net
->v4info
.saddr
= ih
->saddr
;
3760 ad
->u
.net
->v4info
.daddr
= ih
->daddr
;
3764 *proto
= ih
->protocol
;
3766 switch (ih
->protocol
) {
3768 struct tcphdr _tcph
, *th
;
3770 if (ntohs(ih
->frag_off
) & IP_OFFSET
)
3774 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3778 ad
->u
.net
->sport
= th
->source
;
3779 ad
->u
.net
->dport
= th
->dest
;
3784 struct udphdr _udph
, *uh
;
3786 if (ntohs(ih
->frag_off
) & IP_OFFSET
)
3790 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3794 ad
->u
.net
->sport
= uh
->source
;
3795 ad
->u
.net
->dport
= uh
->dest
;
3799 case IPPROTO_DCCP
: {
3800 struct dccp_hdr _dccph
, *dh
;
3802 if (ntohs(ih
->frag_off
) & IP_OFFSET
)
3806 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3810 ad
->u
.net
->sport
= dh
->dccph_sport
;
3811 ad
->u
.net
->dport
= dh
->dccph_dport
;
3822 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3824 /* Returns error only if unable to parse addresses */
3825 static int selinux_parse_skb_ipv6(struct sk_buff
*skb
,
3826 struct common_audit_data
*ad
, u8
*proto
)
3829 int ret
= -EINVAL
, offset
;
3830 struct ipv6hdr _ipv6h
, *ip6
;
3833 offset
= skb_network_offset(skb
);
3834 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3838 ad
->u
.net
->v6info
.saddr
= ip6
->saddr
;
3839 ad
->u
.net
->v6info
.daddr
= ip6
->daddr
;
3842 nexthdr
= ip6
->nexthdr
;
3843 offset
+= sizeof(_ipv6h
);
3844 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3853 struct tcphdr _tcph
, *th
;
3855 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3859 ad
->u
.net
->sport
= th
->source
;
3860 ad
->u
.net
->dport
= th
->dest
;
3865 struct udphdr _udph
, *uh
;
3867 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3871 ad
->u
.net
->sport
= uh
->source
;
3872 ad
->u
.net
->dport
= uh
->dest
;
3876 case IPPROTO_DCCP
: {
3877 struct dccp_hdr _dccph
, *dh
;
3879 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3883 ad
->u
.net
->sport
= dh
->dccph_sport
;
3884 ad
->u
.net
->dport
= dh
->dccph_dport
;
3888 /* includes fragments */
3898 static int selinux_parse_skb(struct sk_buff
*skb
, struct common_audit_data
*ad
,
3899 char **_addrp
, int src
, u8
*proto
)
3904 switch (ad
->u
.net
->family
) {
3906 ret
= selinux_parse_skb_ipv4(skb
, ad
, proto
);
3909 addrp
= (char *)(src
? &ad
->u
.net
->v4info
.saddr
:
3910 &ad
->u
.net
->v4info
.daddr
);
3913 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3915 ret
= selinux_parse_skb_ipv6(skb
, ad
, proto
);
3918 addrp
= (char *)(src
? &ad
->u
.net
->v6info
.saddr
:
3919 &ad
->u
.net
->v6info
.daddr
);
3929 "SELinux: failure in selinux_parse_skb(),"
3930 " unable to parse packet\n");
3940 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
3942 * @family: protocol family
3943 * @sid: the packet's peer label SID
3946 * Check the various different forms of network peer labeling and determine
3947 * the peer label/SID for the packet; most of the magic actually occurs in
3948 * the security server function security_net_peersid_cmp(). The function
3949 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
3950 * or -EACCES if @sid is invalid due to inconsistencies with the different
3954 static int selinux_skb_peerlbl_sid(struct sk_buff
*skb
, u16 family
, u32
*sid
)
3961 err
= selinux_xfrm_skb_sid(skb
, &xfrm_sid
);
3964 err
= selinux_netlbl_skbuff_getsid(skb
, family
, &nlbl_type
, &nlbl_sid
);
3968 err
= security_net_peersid_resolve(nlbl_sid
, nlbl_type
, xfrm_sid
, sid
);
3969 if (unlikely(err
)) {
3971 "SELinux: failure in selinux_skb_peerlbl_sid(),"
3972 " unable to determine packet's peer label\n");
3980 * selinux_conn_sid - Determine the child socket label for a connection
3981 * @sk_sid: the parent socket's SID
3982 * @skb_sid: the packet's SID
3983 * @conn_sid: the resulting connection SID
3985 * If @skb_sid is valid then the user:role:type information from @sk_sid is
3986 * combined with the MLS information from @skb_sid in order to create
3987 * @conn_sid. If @skb_sid is not valid then then @conn_sid is simply a copy
3988 * of @sk_sid. Returns zero on success, negative values on failure.
3991 static int selinux_conn_sid(u32 sk_sid
, u32 skb_sid
, u32
*conn_sid
)
3995 if (skb_sid
!= SECSID_NULL
)
3996 err
= security_sid_mls_copy(sk_sid
, skb_sid
, conn_sid
);
4003 /* socket security operations */
4005 static int socket_sockcreate_sid(const struct task_security_struct
*tsec
,
4006 u16 secclass
, u32
*socksid
)
4008 if (tsec
->sockcreate_sid
> SECSID_NULL
) {
4009 *socksid
= tsec
->sockcreate_sid
;
4013 return security_transition_sid(tsec
->sid
, tsec
->sid
, secclass
, NULL
,
4017 static int sock_has_perm(struct task_struct
*task
, struct sock
*sk
, u32 perms
)
4019 struct sk_security_struct
*sksec
= sk
->sk_security
;
4020 struct common_audit_data ad
;
4021 struct lsm_network_audit net
= {0,};
4022 u32 tsid
= task_sid(task
);
4024 if (sksec
->sid
== SECINITSID_KERNEL
)
4027 ad
.type
= LSM_AUDIT_DATA_NET
;
4031 return avc_has_perm(tsid
, sksec
->sid
, sksec
->sclass
, perms
, &ad
);
4034 static int selinux_socket_create(int family
, int type
,
4035 int protocol
, int kern
)
4037 const struct task_security_struct
*tsec
= current_security();
4045 secclass
= socket_type_to_security_class(family
, type
, protocol
);
4046 rc
= socket_sockcreate_sid(tsec
, secclass
, &newsid
);
4050 return avc_has_perm(tsec
->sid
, newsid
, secclass
, SOCKET__CREATE
, NULL
);
4053 static int selinux_socket_post_create(struct socket
*sock
, int family
,
4054 int type
, int protocol
, int kern
)
4056 const struct task_security_struct
*tsec
= current_security();
4057 struct inode_security_struct
*isec
= SOCK_INODE(sock
)->i_security
;
4058 struct sk_security_struct
*sksec
;
4061 isec
->sclass
= socket_type_to_security_class(family
, type
, protocol
);
4064 isec
->sid
= SECINITSID_KERNEL
;
4066 err
= socket_sockcreate_sid(tsec
, isec
->sclass
, &(isec
->sid
));
4071 isec
->initialized
= 1;
4074 sksec
= sock
->sk
->sk_security
;
4075 sksec
->sid
= isec
->sid
;
4076 sksec
->sclass
= isec
->sclass
;
4077 err
= selinux_netlbl_socket_post_create(sock
->sk
, family
);
4083 /* Range of port numbers used to automatically bind.
4084 Need to determine whether we should perform a name_bind
4085 permission check between the socket and the port number. */
4087 static int selinux_socket_bind(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
4089 struct sock
*sk
= sock
->sk
;
4093 err
= sock_has_perm(current
, sk
, SOCKET__BIND
);
4098 * If PF_INET or PF_INET6, check name_bind permission for the port.
4099 * Multiple address binding for SCTP is not supported yet: we just
4100 * check the first address now.
4102 family
= sk
->sk_family
;
4103 if (family
== PF_INET
|| family
== PF_INET6
) {
4105 struct sk_security_struct
*sksec
= sk
->sk_security
;
4106 struct common_audit_data ad
;
4107 struct lsm_network_audit net
= {0,};
4108 struct sockaddr_in
*addr4
= NULL
;
4109 struct sockaddr_in6
*addr6
= NULL
;
4110 unsigned short snum
;
4113 if (family
== PF_INET
) {
4114 addr4
= (struct sockaddr_in
*)address
;
4115 snum
= ntohs(addr4
->sin_port
);
4116 addrp
= (char *)&addr4
->sin_addr
.s_addr
;
4118 addr6
= (struct sockaddr_in6
*)address
;
4119 snum
= ntohs(addr6
->sin6_port
);
4120 addrp
= (char *)&addr6
->sin6_addr
.s6_addr
;
4126 inet_get_local_port_range(sock_net(sk
), &low
, &high
);
4128 if (snum
< max(PROT_SOCK
, low
) || snum
> high
) {
4129 err
= sel_netport_sid(sk
->sk_protocol
,
4133 ad
.type
= LSM_AUDIT_DATA_NET
;
4135 ad
.u
.net
->sport
= htons(snum
);
4136 ad
.u
.net
->family
= family
;
4137 err
= avc_has_perm(sksec
->sid
, sid
,
4139 SOCKET__NAME_BIND
, &ad
);
4145 switch (sksec
->sclass
) {
4146 case SECCLASS_TCP_SOCKET
:
4147 node_perm
= TCP_SOCKET__NODE_BIND
;
4150 case SECCLASS_UDP_SOCKET
:
4151 node_perm
= UDP_SOCKET__NODE_BIND
;
4154 case SECCLASS_DCCP_SOCKET
:
4155 node_perm
= DCCP_SOCKET__NODE_BIND
;
4159 node_perm
= RAWIP_SOCKET__NODE_BIND
;
4163 err
= sel_netnode_sid(addrp
, family
, &sid
);
4167 ad
.type
= LSM_AUDIT_DATA_NET
;
4169 ad
.u
.net
->sport
= htons(snum
);
4170 ad
.u
.net
->family
= family
;
4172 if (family
== PF_INET
)
4173 ad
.u
.net
->v4info
.saddr
= addr4
->sin_addr
.s_addr
;
4175 ad
.u
.net
->v6info
.saddr
= addr6
->sin6_addr
;
4177 err
= avc_has_perm(sksec
->sid
, sid
,
4178 sksec
->sclass
, node_perm
, &ad
);
4186 static int selinux_socket_connect(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
4188 struct sock
*sk
= sock
->sk
;
4189 struct sk_security_struct
*sksec
= sk
->sk_security
;
4192 err
= sock_has_perm(current
, sk
, SOCKET__CONNECT
);
4197 * If a TCP or DCCP socket, check name_connect permission for the port.
4199 if (sksec
->sclass
== SECCLASS_TCP_SOCKET
||
4200 sksec
->sclass
== SECCLASS_DCCP_SOCKET
) {
4201 struct common_audit_data ad
;
4202 struct lsm_network_audit net
= {0,};
4203 struct sockaddr_in
*addr4
= NULL
;
4204 struct sockaddr_in6
*addr6
= NULL
;
4205 unsigned short snum
;
4208 if (sk
->sk_family
== PF_INET
) {
4209 addr4
= (struct sockaddr_in
*)address
;
4210 if (addrlen
< sizeof(struct sockaddr_in
))
4212 snum
= ntohs(addr4
->sin_port
);
4214 addr6
= (struct sockaddr_in6
*)address
;
4215 if (addrlen
< SIN6_LEN_RFC2133
)
4217 snum
= ntohs(addr6
->sin6_port
);
4220 err
= sel_netport_sid(sk
->sk_protocol
, snum
, &sid
);
4224 perm
= (sksec
->sclass
== SECCLASS_TCP_SOCKET
) ?
4225 TCP_SOCKET__NAME_CONNECT
: DCCP_SOCKET__NAME_CONNECT
;
4227 ad
.type
= LSM_AUDIT_DATA_NET
;
4229 ad
.u
.net
->dport
= htons(snum
);
4230 ad
.u
.net
->family
= sk
->sk_family
;
4231 err
= avc_has_perm(sksec
->sid
, sid
, sksec
->sclass
, perm
, &ad
);
4236 err
= selinux_netlbl_socket_connect(sk
, address
);
4242 static int selinux_socket_listen(struct socket
*sock
, int backlog
)
4244 return sock_has_perm(current
, sock
->sk
, SOCKET__LISTEN
);
4247 static int selinux_socket_accept(struct socket
*sock
, struct socket
*newsock
)
4250 struct inode_security_struct
*isec
;
4251 struct inode_security_struct
*newisec
;
4253 err
= sock_has_perm(current
, sock
->sk
, SOCKET__ACCEPT
);
4257 newisec
= SOCK_INODE(newsock
)->i_security
;
4259 isec
= SOCK_INODE(sock
)->i_security
;
4260 newisec
->sclass
= isec
->sclass
;
4261 newisec
->sid
= isec
->sid
;
4262 newisec
->initialized
= 1;
4267 static int selinux_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
4270 return sock_has_perm(current
, sock
->sk
, SOCKET__WRITE
);
4273 static int selinux_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
4274 int size
, int flags
)
4276 return sock_has_perm(current
, sock
->sk
, SOCKET__READ
);
4279 static int selinux_socket_getsockname(struct socket
*sock
)
4281 return sock_has_perm(current
, sock
->sk
, SOCKET__GETATTR
);
4284 static int selinux_socket_getpeername(struct socket
*sock
)
4286 return sock_has_perm(current
, sock
->sk
, SOCKET__GETATTR
);
4289 static int selinux_socket_setsockopt(struct socket
*sock
, int level
, int optname
)
4293 err
= sock_has_perm(current
, sock
->sk
, SOCKET__SETOPT
);
4297 return selinux_netlbl_socket_setsockopt(sock
, level
, optname
);
4300 static int selinux_socket_getsockopt(struct socket
*sock
, int level
,
4303 return sock_has_perm(current
, sock
->sk
, SOCKET__GETOPT
);
4306 static int selinux_socket_shutdown(struct socket
*sock
, int how
)
4308 return sock_has_perm(current
, sock
->sk
, SOCKET__SHUTDOWN
);
4311 static int selinux_socket_unix_stream_connect(struct sock
*sock
,
4315 struct sk_security_struct
*sksec_sock
= sock
->sk_security
;
4316 struct sk_security_struct
*sksec_other
= other
->sk_security
;
4317 struct sk_security_struct
*sksec_new
= newsk
->sk_security
;
4318 struct common_audit_data ad
;
4319 struct lsm_network_audit net
= {0,};
4322 ad
.type
= LSM_AUDIT_DATA_NET
;
4324 ad
.u
.net
->sk
= other
;
4326 err
= avc_has_perm(sksec_sock
->sid
, sksec_other
->sid
,
4327 sksec_other
->sclass
,
4328 UNIX_STREAM_SOCKET__CONNECTTO
, &ad
);
4332 /* server child socket */
4333 sksec_new
->peer_sid
= sksec_sock
->sid
;
4334 err
= security_sid_mls_copy(sksec_other
->sid
, sksec_sock
->sid
,
4339 /* connecting socket */
4340 sksec_sock
->peer_sid
= sksec_new
->sid
;
4345 static int selinux_socket_unix_may_send(struct socket
*sock
,
4346 struct socket
*other
)
4348 struct sk_security_struct
*ssec
= sock
->sk
->sk_security
;
4349 struct sk_security_struct
*osec
= other
->sk
->sk_security
;
4350 struct common_audit_data ad
;
4351 struct lsm_network_audit net
= {0,};
4353 ad
.type
= LSM_AUDIT_DATA_NET
;
4355 ad
.u
.net
->sk
= other
->sk
;
4357 return avc_has_perm(ssec
->sid
, osec
->sid
, osec
->sclass
, SOCKET__SENDTO
,
4361 static int selinux_inet_sys_rcv_skb(struct net
*ns
, int ifindex
,
4362 char *addrp
, u16 family
, u32 peer_sid
,
4363 struct common_audit_data
*ad
)
4369 err
= sel_netif_sid(ns
, ifindex
, &if_sid
);
4372 err
= avc_has_perm(peer_sid
, if_sid
,
4373 SECCLASS_NETIF
, NETIF__INGRESS
, ad
);
4377 err
= sel_netnode_sid(addrp
, family
, &node_sid
);
4380 return avc_has_perm(peer_sid
, node_sid
,
4381 SECCLASS_NODE
, NODE__RECVFROM
, ad
);
4384 static int selinux_sock_rcv_skb_compat(struct sock
*sk
, struct sk_buff
*skb
,
4388 struct sk_security_struct
*sksec
= sk
->sk_security
;
4389 u32 sk_sid
= sksec
->sid
;
4390 struct common_audit_data ad
;
4391 struct lsm_network_audit net
= {0,};
4394 ad
.type
= LSM_AUDIT_DATA_NET
;
4396 ad
.u
.net
->netif
= skb
->skb_iif
;
4397 ad
.u
.net
->family
= family
;
4398 err
= selinux_parse_skb(skb
, &ad
, &addrp
, 1, NULL
);
4402 if (selinux_secmark_enabled()) {
4403 err
= avc_has_perm(sk_sid
, skb
->secmark
, SECCLASS_PACKET
,
4409 err
= selinux_netlbl_sock_rcv_skb(sksec
, skb
, family
, &ad
);
4412 err
= selinux_xfrm_sock_rcv_skb(sksec
->sid
, skb
, &ad
);
4417 static int selinux_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
4420 struct sk_security_struct
*sksec
= sk
->sk_security
;
4421 u16 family
= sk
->sk_family
;
4422 u32 sk_sid
= sksec
->sid
;
4423 struct common_audit_data ad
;
4424 struct lsm_network_audit net
= {0,};
4429 if (family
!= PF_INET
&& family
!= PF_INET6
)
4432 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
4433 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
4436 /* If any sort of compatibility mode is enabled then handoff processing
4437 * to the selinux_sock_rcv_skb_compat() function to deal with the
4438 * special handling. We do this in an attempt to keep this function
4439 * as fast and as clean as possible. */
4440 if (!selinux_policycap_netpeer
)
4441 return selinux_sock_rcv_skb_compat(sk
, skb
, family
);
4443 secmark_active
= selinux_secmark_enabled();
4444 peerlbl_active
= selinux_peerlbl_enabled();
4445 if (!secmark_active
&& !peerlbl_active
)
4448 ad
.type
= LSM_AUDIT_DATA_NET
;
4450 ad
.u
.net
->netif
= skb
->skb_iif
;
4451 ad
.u
.net
->family
= family
;
4452 err
= selinux_parse_skb(skb
, &ad
, &addrp
, 1, NULL
);
4456 if (peerlbl_active
) {
4459 err
= selinux_skb_peerlbl_sid(skb
, family
, &peer_sid
);
4462 err
= selinux_inet_sys_rcv_skb(sock_net(sk
), skb
->skb_iif
,
4463 addrp
, family
, peer_sid
, &ad
);
4465 selinux_netlbl_err(skb
, err
, 0);
4468 err
= avc_has_perm(sk_sid
, peer_sid
, SECCLASS_PEER
,
4471 selinux_netlbl_err(skb
, err
, 0);
4476 if (secmark_active
) {
4477 err
= avc_has_perm(sk_sid
, skb
->secmark
, SECCLASS_PACKET
,
4486 static int selinux_socket_getpeersec_stream(struct socket
*sock
, char __user
*optval
,
4487 int __user
*optlen
, unsigned len
)
4492 struct sk_security_struct
*sksec
= sock
->sk
->sk_security
;
4493 u32 peer_sid
= SECSID_NULL
;
4495 if (sksec
->sclass
== SECCLASS_UNIX_STREAM_SOCKET
||
4496 sksec
->sclass
== SECCLASS_TCP_SOCKET
)
4497 peer_sid
= sksec
->peer_sid
;
4498 if (peer_sid
== SECSID_NULL
)
4499 return -ENOPROTOOPT
;
4501 err
= security_sid_to_context(peer_sid
, &scontext
, &scontext_len
);
4505 if (scontext_len
> len
) {
4510 if (copy_to_user(optval
, scontext
, scontext_len
))
4514 if (put_user(scontext_len
, optlen
))
4520 static int selinux_socket_getpeersec_dgram(struct socket
*sock
, struct sk_buff
*skb
, u32
*secid
)
4522 u32 peer_secid
= SECSID_NULL
;
4525 if (skb
&& skb
->protocol
== htons(ETH_P_IP
))
4527 else if (skb
&& skb
->protocol
== htons(ETH_P_IPV6
))
4530 family
= sock
->sk
->sk_family
;
4534 if (sock
&& family
== PF_UNIX
)
4535 selinux_inode_getsecid(SOCK_INODE(sock
), &peer_secid
);
4537 selinux_skb_peerlbl_sid(skb
, family
, &peer_secid
);
4540 *secid
= peer_secid
;
4541 if (peer_secid
== SECSID_NULL
)
4546 static int selinux_sk_alloc_security(struct sock
*sk
, int family
, gfp_t priority
)
4548 struct sk_security_struct
*sksec
;
4550 sksec
= kzalloc(sizeof(*sksec
), priority
);
4554 sksec
->peer_sid
= SECINITSID_UNLABELED
;
4555 sksec
->sid
= SECINITSID_UNLABELED
;
4556 selinux_netlbl_sk_security_reset(sksec
);
4557 sk
->sk_security
= sksec
;
4562 static void selinux_sk_free_security(struct sock
*sk
)
4564 struct sk_security_struct
*sksec
= sk
->sk_security
;
4566 sk
->sk_security
= NULL
;
4567 selinux_netlbl_sk_security_free(sksec
);
4571 static void selinux_sk_clone_security(const struct sock
*sk
, struct sock
*newsk
)
4573 struct sk_security_struct
*sksec
= sk
->sk_security
;
4574 struct sk_security_struct
*newsksec
= newsk
->sk_security
;
4576 newsksec
->sid
= sksec
->sid
;
4577 newsksec
->peer_sid
= sksec
->peer_sid
;
4578 newsksec
->sclass
= sksec
->sclass
;
4580 selinux_netlbl_sk_security_reset(newsksec
);
4583 static void selinux_sk_getsecid(struct sock
*sk
, u32
*secid
)
4586 *secid
= SECINITSID_ANY_SOCKET
;
4588 struct sk_security_struct
*sksec
= sk
->sk_security
;
4590 *secid
= sksec
->sid
;
4594 static void selinux_sock_graft(struct sock
*sk
, struct socket
*parent
)
4596 struct inode_security_struct
*isec
= SOCK_INODE(parent
)->i_security
;
4597 struct sk_security_struct
*sksec
= sk
->sk_security
;
4599 if (sk
->sk_family
== PF_INET
|| sk
->sk_family
== PF_INET6
||
4600 sk
->sk_family
== PF_UNIX
)
4601 isec
->sid
= sksec
->sid
;
4602 sksec
->sclass
= isec
->sclass
;
4605 static int selinux_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4606 struct request_sock
*req
)
4608 struct sk_security_struct
*sksec
= sk
->sk_security
;
4610 u16 family
= req
->rsk_ops
->family
;
4614 err
= selinux_skb_peerlbl_sid(skb
, family
, &peersid
);
4617 err
= selinux_conn_sid(sksec
->sid
, peersid
, &connsid
);
4620 req
->secid
= connsid
;
4621 req
->peer_secid
= peersid
;
4623 return selinux_netlbl_inet_conn_request(req
, family
);
4626 static void selinux_inet_csk_clone(struct sock
*newsk
,
4627 const struct request_sock
*req
)
4629 struct sk_security_struct
*newsksec
= newsk
->sk_security
;
4631 newsksec
->sid
= req
->secid
;
4632 newsksec
->peer_sid
= req
->peer_secid
;
4633 /* NOTE: Ideally, we should also get the isec->sid for the
4634 new socket in sync, but we don't have the isec available yet.
4635 So we will wait until sock_graft to do it, by which
4636 time it will have been created and available. */
4638 /* We don't need to take any sort of lock here as we are the only
4639 * thread with access to newsksec */
4640 selinux_netlbl_inet_csk_clone(newsk
, req
->rsk_ops
->family
);
4643 static void selinux_inet_conn_established(struct sock
*sk
, struct sk_buff
*skb
)
4645 u16 family
= sk
->sk_family
;
4646 struct sk_security_struct
*sksec
= sk
->sk_security
;
4648 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4649 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
4652 selinux_skb_peerlbl_sid(skb
, family
, &sksec
->peer_sid
);
4655 static void selinux_skb_owned_by(struct sk_buff
*skb
, struct sock
*sk
)
4657 skb_set_owner_w(skb
, sk
);
4660 static int selinux_secmark_relabel_packet(u32 sid
)
4662 const struct task_security_struct
*__tsec
;
4665 __tsec
= current_security();
4668 return avc_has_perm(tsid
, sid
, SECCLASS_PACKET
, PACKET__RELABELTO
, NULL
);
4671 static void selinux_secmark_refcount_inc(void)
4673 atomic_inc(&selinux_secmark_refcount
);
4676 static void selinux_secmark_refcount_dec(void)
4678 atomic_dec(&selinux_secmark_refcount
);
4681 static void selinux_req_classify_flow(const struct request_sock
*req
,
4684 fl
->flowi_secid
= req
->secid
;
4687 static int selinux_tun_dev_alloc_security(void **security
)
4689 struct tun_security_struct
*tunsec
;
4691 tunsec
= kzalloc(sizeof(*tunsec
), GFP_KERNEL
);
4694 tunsec
->sid
= current_sid();
4700 static void selinux_tun_dev_free_security(void *security
)
4705 static int selinux_tun_dev_create(void)
4707 u32 sid
= current_sid();
4709 /* we aren't taking into account the "sockcreate" SID since the socket
4710 * that is being created here is not a socket in the traditional sense,
4711 * instead it is a private sock, accessible only to the kernel, and
4712 * representing a wide range of network traffic spanning multiple
4713 * connections unlike traditional sockets - check the TUN driver to
4714 * get a better understanding of why this socket is special */
4716 return avc_has_perm(sid
, sid
, SECCLASS_TUN_SOCKET
, TUN_SOCKET__CREATE
,
4720 static int selinux_tun_dev_attach_queue(void *security
)
4722 struct tun_security_struct
*tunsec
= security
;
4724 return avc_has_perm(current_sid(), tunsec
->sid
, SECCLASS_TUN_SOCKET
,
4725 TUN_SOCKET__ATTACH_QUEUE
, NULL
);
4728 static int selinux_tun_dev_attach(struct sock
*sk
, void *security
)
4730 struct tun_security_struct
*tunsec
= security
;
4731 struct sk_security_struct
*sksec
= sk
->sk_security
;
4733 /* we don't currently perform any NetLabel based labeling here and it
4734 * isn't clear that we would want to do so anyway; while we could apply
4735 * labeling without the support of the TUN user the resulting labeled
4736 * traffic from the other end of the connection would almost certainly
4737 * cause confusion to the TUN user that had no idea network labeling
4738 * protocols were being used */
4740 sksec
->sid
= tunsec
->sid
;
4741 sksec
->sclass
= SECCLASS_TUN_SOCKET
;
4746 static int selinux_tun_dev_open(void *security
)
4748 struct tun_security_struct
*tunsec
= security
;
4749 u32 sid
= current_sid();
4752 err
= avc_has_perm(sid
, tunsec
->sid
, SECCLASS_TUN_SOCKET
,
4753 TUN_SOCKET__RELABELFROM
, NULL
);
4756 err
= avc_has_perm(sid
, sid
, SECCLASS_TUN_SOCKET
,
4757 TUN_SOCKET__RELABELTO
, NULL
);
4765 static int selinux_nlmsg_perm(struct sock
*sk
, struct sk_buff
*skb
)
4769 struct nlmsghdr
*nlh
;
4770 struct sk_security_struct
*sksec
= sk
->sk_security
;
4772 if (skb
->len
< NLMSG_HDRLEN
) {
4776 nlh
= nlmsg_hdr(skb
);
4778 err
= selinux_nlmsg_lookup(sksec
->sclass
, nlh
->nlmsg_type
, &perm
);
4780 if (err
== -EINVAL
) {
4782 "SELinux: unrecognized netlink message:"
4783 " protocol=%hu nlmsg_type=%hu sclass=%hu\n",
4784 sk
->sk_protocol
, nlh
->nlmsg_type
, sksec
->sclass
);
4785 if (!selinux_enforcing
|| security_get_allow_unknown())
4795 err
= sock_has_perm(current
, sk
, perm
);
4800 #ifdef CONFIG_NETFILTER
4802 static unsigned int selinux_ip_forward(struct sk_buff
*skb
,
4803 const struct net_device
*indev
,
4809 struct common_audit_data ad
;
4810 struct lsm_network_audit net
= {0,};
4815 if (!selinux_policycap_netpeer
)
4818 secmark_active
= selinux_secmark_enabled();
4819 netlbl_active
= netlbl_enabled();
4820 peerlbl_active
= selinux_peerlbl_enabled();
4821 if (!secmark_active
&& !peerlbl_active
)
4824 if (selinux_skb_peerlbl_sid(skb
, family
, &peer_sid
) != 0)
4827 ad
.type
= LSM_AUDIT_DATA_NET
;
4829 ad
.u
.net
->netif
= indev
->ifindex
;
4830 ad
.u
.net
->family
= family
;
4831 if (selinux_parse_skb(skb
, &ad
, &addrp
, 1, NULL
) != 0)
4834 if (peerlbl_active
) {
4835 err
= selinux_inet_sys_rcv_skb(dev_net(indev
), indev
->ifindex
,
4836 addrp
, family
, peer_sid
, &ad
);
4838 selinux_netlbl_err(skb
, err
, 1);
4844 if (avc_has_perm(peer_sid
, skb
->secmark
,
4845 SECCLASS_PACKET
, PACKET__FORWARD_IN
, &ad
))
4849 /* we do this in the FORWARD path and not the POST_ROUTING
4850 * path because we want to make sure we apply the necessary
4851 * labeling before IPsec is applied so we can leverage AH
4853 if (selinux_netlbl_skbuff_setsid(skb
, family
, peer_sid
) != 0)
4859 static unsigned int selinux_ipv4_forward(const struct nf_hook_ops
*ops
,
4860 struct sk_buff
*skb
,
4861 const struct net_device
*in
,
4862 const struct net_device
*out
,
4863 int (*okfn
)(struct sk_buff
*))
4865 return selinux_ip_forward(skb
, in
, PF_INET
);
4868 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4869 static unsigned int selinux_ipv6_forward(const struct nf_hook_ops
*ops
,
4870 struct sk_buff
*skb
,
4871 const struct net_device
*in
,
4872 const struct net_device
*out
,
4873 int (*okfn
)(struct sk_buff
*))
4875 return selinux_ip_forward(skb
, in
, PF_INET6
);
4879 static unsigned int selinux_ip_output(struct sk_buff
*skb
,
4885 if (!netlbl_enabled())
4888 /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
4889 * because we want to make sure we apply the necessary labeling
4890 * before IPsec is applied so we can leverage AH protection */
4893 struct sk_security_struct
*sksec
;
4895 if (sk
->sk_state
== TCP_LISTEN
)
4896 /* if the socket is the listening state then this
4897 * packet is a SYN-ACK packet which means it needs to
4898 * be labeled based on the connection/request_sock and
4899 * not the parent socket. unfortunately, we can't
4900 * lookup the request_sock yet as it isn't queued on
4901 * the parent socket until after the SYN-ACK is sent.
4902 * the "solution" is to simply pass the packet as-is
4903 * as any IP option based labeling should be copied
4904 * from the initial connection request (in the IP
4905 * layer). it is far from ideal, but until we get a
4906 * security label in the packet itself this is the
4907 * best we can do. */
4910 /* standard practice, label using the parent socket */
4911 sksec
= sk
->sk_security
;
4914 sid
= SECINITSID_KERNEL
;
4915 if (selinux_netlbl_skbuff_setsid(skb
, family
, sid
) != 0)
4921 static unsigned int selinux_ipv4_output(const struct nf_hook_ops
*ops
,
4922 struct sk_buff
*skb
,
4923 const struct net_device
*in
,
4924 const struct net_device
*out
,
4925 int (*okfn
)(struct sk_buff
*))
4927 return selinux_ip_output(skb
, PF_INET
);
4930 static unsigned int selinux_ip_postroute_compat(struct sk_buff
*skb
,
4934 struct sock
*sk
= skb
->sk
;
4935 struct sk_security_struct
*sksec
;
4936 struct common_audit_data ad
;
4937 struct lsm_network_audit net
= {0,};
4943 sksec
= sk
->sk_security
;
4945 ad
.type
= LSM_AUDIT_DATA_NET
;
4947 ad
.u
.net
->netif
= ifindex
;
4948 ad
.u
.net
->family
= family
;
4949 if (selinux_parse_skb(skb
, &ad
, &addrp
, 0, &proto
))
4952 if (selinux_secmark_enabled())
4953 if (avc_has_perm(sksec
->sid
, skb
->secmark
,
4954 SECCLASS_PACKET
, PACKET__SEND
, &ad
))
4955 return NF_DROP_ERR(-ECONNREFUSED
);
4957 if (selinux_xfrm_postroute_last(sksec
->sid
, skb
, &ad
, proto
))
4958 return NF_DROP_ERR(-ECONNREFUSED
);
4963 static unsigned int selinux_ip_postroute(struct sk_buff
*skb
,
4964 const struct net_device
*outdev
,
4969 int ifindex
= outdev
->ifindex
;
4971 struct common_audit_data ad
;
4972 struct lsm_network_audit net
= {0,};
4977 /* If any sort of compatibility mode is enabled then handoff processing
4978 * to the selinux_ip_postroute_compat() function to deal with the
4979 * special handling. We do this in an attempt to keep this function
4980 * as fast and as clean as possible. */
4981 if (!selinux_policycap_netpeer
)
4982 return selinux_ip_postroute_compat(skb
, ifindex
, family
);
4984 secmark_active
= selinux_secmark_enabled();
4985 peerlbl_active
= selinux_peerlbl_enabled();
4986 if (!secmark_active
&& !peerlbl_active
)
4992 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
4993 * packet transformation so allow the packet to pass without any checks
4994 * since we'll have another chance to perform access control checks
4995 * when the packet is on it's final way out.
4996 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
4997 * is NULL, in this case go ahead and apply access control.
4998 * NOTE: if this is a local socket (skb->sk != NULL) that is in the
4999 * TCP listening state we cannot wait until the XFRM processing
5000 * is done as we will miss out on the SA label if we do;
5001 * unfortunately, this means more work, but it is only once per
5003 if (skb_dst(skb
) != NULL
&& skb_dst(skb
)->xfrm
!= NULL
&&
5004 !(sk
!= NULL
&& sk
->sk_state
== TCP_LISTEN
))
5009 /* Without an associated socket the packet is either coming
5010 * from the kernel or it is being forwarded; check the packet
5011 * to determine which and if the packet is being forwarded
5012 * query the packet directly to determine the security label. */
5014 secmark_perm
= PACKET__FORWARD_OUT
;
5015 if (selinux_skb_peerlbl_sid(skb
, family
, &peer_sid
))
5018 secmark_perm
= PACKET__SEND
;
5019 peer_sid
= SECINITSID_KERNEL
;
5021 } else if (sk
->sk_state
== TCP_LISTEN
) {
5022 /* Locally generated packet but the associated socket is in the
5023 * listening state which means this is a SYN-ACK packet. In
5024 * this particular case the correct security label is assigned
5025 * to the connection/request_sock but unfortunately we can't
5026 * query the request_sock as it isn't queued on the parent
5027 * socket until after the SYN-ACK packet is sent; the only
5028 * viable choice is to regenerate the label like we do in
5029 * selinux_inet_conn_request(). See also selinux_ip_output()
5030 * for similar problems. */
5032 struct sk_security_struct
*sksec
= sk
->sk_security
;
5033 if (selinux_skb_peerlbl_sid(skb
, family
, &skb_sid
))
5035 /* At this point, if the returned skb peerlbl is SECSID_NULL
5036 * and the packet has been through at least one XFRM
5037 * transformation then we must be dealing with the "final"
5038 * form of labeled IPsec packet; since we've already applied
5039 * all of our access controls on this packet we can safely
5040 * pass the packet. */
5041 if (skb_sid
== SECSID_NULL
) {
5044 if (IPCB(skb
)->flags
& IPSKB_XFRM_TRANSFORMED
)
5048 if (IP6CB(skb
)->flags
& IP6SKB_XFRM_TRANSFORMED
)
5052 return NF_DROP_ERR(-ECONNREFUSED
);
5055 if (selinux_conn_sid(sksec
->sid
, skb_sid
, &peer_sid
))
5057 secmark_perm
= PACKET__SEND
;
5059 /* Locally generated packet, fetch the security label from the
5060 * associated socket. */
5061 struct sk_security_struct
*sksec
= sk
->sk_security
;
5062 peer_sid
= sksec
->sid
;
5063 secmark_perm
= PACKET__SEND
;
5066 ad
.type
= LSM_AUDIT_DATA_NET
;
5068 ad
.u
.net
->netif
= ifindex
;
5069 ad
.u
.net
->family
= family
;
5070 if (selinux_parse_skb(skb
, &ad
, &addrp
, 0, NULL
))
5074 if (avc_has_perm(peer_sid
, skb
->secmark
,
5075 SECCLASS_PACKET
, secmark_perm
, &ad
))
5076 return NF_DROP_ERR(-ECONNREFUSED
);
5078 if (peerlbl_active
) {
5082 if (sel_netif_sid(dev_net(outdev
), ifindex
, &if_sid
))
5084 if (avc_has_perm(peer_sid
, if_sid
,
5085 SECCLASS_NETIF
, NETIF__EGRESS
, &ad
))
5086 return NF_DROP_ERR(-ECONNREFUSED
);
5088 if (sel_netnode_sid(addrp
, family
, &node_sid
))
5090 if (avc_has_perm(peer_sid
, node_sid
,
5091 SECCLASS_NODE
, NODE__SENDTO
, &ad
))
5092 return NF_DROP_ERR(-ECONNREFUSED
);
5098 static unsigned int selinux_ipv4_postroute(const struct nf_hook_ops
*ops
,
5099 struct sk_buff
*skb
,
5100 const struct net_device
*in
,
5101 const struct net_device
*out
,
5102 int (*okfn
)(struct sk_buff
*))
5104 return selinux_ip_postroute(skb
, out
, PF_INET
);
5107 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5108 static unsigned int selinux_ipv6_postroute(const struct nf_hook_ops
*ops
,
5109 struct sk_buff
*skb
,
5110 const struct net_device
*in
,
5111 const struct net_device
*out
,
5112 int (*okfn
)(struct sk_buff
*))
5114 return selinux_ip_postroute(skb
, out
, PF_INET6
);
5118 #endif /* CONFIG_NETFILTER */
5120 static int selinux_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
5124 err
= cap_netlink_send(sk
, skb
);
5128 return selinux_nlmsg_perm(sk
, skb
);
5131 static int ipc_alloc_security(struct task_struct
*task
,
5132 struct kern_ipc_perm
*perm
,
5135 struct ipc_security_struct
*isec
;
5138 isec
= kzalloc(sizeof(struct ipc_security_struct
), GFP_KERNEL
);
5142 sid
= task_sid(task
);
5143 isec
->sclass
= sclass
;
5145 perm
->security
= isec
;
5150 static void ipc_free_security(struct kern_ipc_perm
*perm
)
5152 struct ipc_security_struct
*isec
= perm
->security
;
5153 perm
->security
= NULL
;
5157 static int msg_msg_alloc_security(struct msg_msg
*msg
)
5159 struct msg_security_struct
*msec
;
5161 msec
= kzalloc(sizeof(struct msg_security_struct
), GFP_KERNEL
);
5165 msec
->sid
= SECINITSID_UNLABELED
;
5166 msg
->security
= msec
;
5171 static void msg_msg_free_security(struct msg_msg
*msg
)
5173 struct msg_security_struct
*msec
= msg
->security
;
5175 msg
->security
= NULL
;
5179 static int ipc_has_perm(struct kern_ipc_perm
*ipc_perms
,
5182 struct ipc_security_struct
*isec
;
5183 struct common_audit_data ad
;
5184 u32 sid
= current_sid();
5186 isec
= ipc_perms
->security
;
5188 ad
.type
= LSM_AUDIT_DATA_IPC
;
5189 ad
.u
.ipc_id
= ipc_perms
->key
;
5191 return avc_has_perm(sid
, isec
->sid
, isec
->sclass
, perms
, &ad
);
5194 static int selinux_msg_msg_alloc_security(struct msg_msg
*msg
)
5196 return msg_msg_alloc_security(msg
);
5199 static void selinux_msg_msg_free_security(struct msg_msg
*msg
)
5201 msg_msg_free_security(msg
);
5204 /* message queue security operations */
5205 static int selinux_msg_queue_alloc_security(struct msg_queue
*msq
)
5207 struct ipc_security_struct
*isec
;
5208 struct common_audit_data ad
;
5209 u32 sid
= current_sid();
5212 rc
= ipc_alloc_security(current
, &msq
->q_perm
, SECCLASS_MSGQ
);
5216 isec
= msq
->q_perm
.security
;
5218 ad
.type
= LSM_AUDIT_DATA_IPC
;
5219 ad
.u
.ipc_id
= msq
->q_perm
.key
;
5221 rc
= avc_has_perm(sid
, isec
->sid
, SECCLASS_MSGQ
,
5224 ipc_free_security(&msq
->q_perm
);
5230 static void selinux_msg_queue_free_security(struct msg_queue
*msq
)
5232 ipc_free_security(&msq
->q_perm
);
5235 static int selinux_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
5237 struct ipc_security_struct
*isec
;
5238 struct common_audit_data ad
;
5239 u32 sid
= current_sid();
5241 isec
= msq
->q_perm
.security
;
5243 ad
.type
= LSM_AUDIT_DATA_IPC
;
5244 ad
.u
.ipc_id
= msq
->q_perm
.key
;
5246 return avc_has_perm(sid
, isec
->sid
, SECCLASS_MSGQ
,
5247 MSGQ__ASSOCIATE
, &ad
);
5250 static int selinux_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
5258 /* No specific object, just general system-wide information. */
5259 return task_has_system(current
, SYSTEM__IPC_INFO
);
5262 perms
= MSGQ__GETATTR
| MSGQ__ASSOCIATE
;
5265 perms
= MSGQ__SETATTR
;
5268 perms
= MSGQ__DESTROY
;
5274 err
= ipc_has_perm(&msq
->q_perm
, perms
);
5278 static int selinux_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
, int msqflg
)
5280 struct ipc_security_struct
*isec
;
5281 struct msg_security_struct
*msec
;
5282 struct common_audit_data ad
;
5283 u32 sid
= current_sid();
5286 isec
= msq
->q_perm
.security
;
5287 msec
= msg
->security
;
5290 * First time through, need to assign label to the message
5292 if (msec
->sid
== SECINITSID_UNLABELED
) {
5294 * Compute new sid based on current process and
5295 * message queue this message will be stored in
5297 rc
= security_transition_sid(sid
, isec
->sid
, SECCLASS_MSG
,
5303 ad
.type
= LSM_AUDIT_DATA_IPC
;
5304 ad
.u
.ipc_id
= msq
->q_perm
.key
;
5306 /* Can this process write to the queue? */
5307 rc
= avc_has_perm(sid
, isec
->sid
, SECCLASS_MSGQ
,
5310 /* Can this process send the message */
5311 rc
= avc_has_perm(sid
, msec
->sid
, SECCLASS_MSG
,
5314 /* Can the message be put in the queue? */
5315 rc
= avc_has_perm(msec
->sid
, isec
->sid
, SECCLASS_MSGQ
,
5316 MSGQ__ENQUEUE
, &ad
);
5321 static int selinux_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
5322 struct task_struct
*target
,
5323 long type
, int mode
)
5325 struct ipc_security_struct
*isec
;
5326 struct msg_security_struct
*msec
;
5327 struct common_audit_data ad
;
5328 u32 sid
= task_sid(target
);
5331 isec
= msq
->q_perm
.security
;
5332 msec
= msg
->security
;
5334 ad
.type
= LSM_AUDIT_DATA_IPC
;
5335 ad
.u
.ipc_id
= msq
->q_perm
.key
;
5337 rc
= avc_has_perm(sid
, isec
->sid
,
5338 SECCLASS_MSGQ
, MSGQ__READ
, &ad
);
5340 rc
= avc_has_perm(sid
, msec
->sid
,
5341 SECCLASS_MSG
, MSG__RECEIVE
, &ad
);
5345 /* Shared Memory security operations */
5346 static int selinux_shm_alloc_security(struct shmid_kernel
*shp
)
5348 struct ipc_security_struct
*isec
;
5349 struct common_audit_data ad
;
5350 u32 sid
= current_sid();
5353 rc
= ipc_alloc_security(current
, &shp
->shm_perm
, SECCLASS_SHM
);
5357 isec
= shp
->shm_perm
.security
;
5359 ad
.type
= LSM_AUDIT_DATA_IPC
;
5360 ad
.u
.ipc_id
= shp
->shm_perm
.key
;
5362 rc
= avc_has_perm(sid
, isec
->sid
, SECCLASS_SHM
,
5365 ipc_free_security(&shp
->shm_perm
);
5371 static void selinux_shm_free_security(struct shmid_kernel
*shp
)
5373 ipc_free_security(&shp
->shm_perm
);
5376 static int selinux_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
5378 struct ipc_security_struct
*isec
;
5379 struct common_audit_data ad
;
5380 u32 sid
= current_sid();
5382 isec
= shp
->shm_perm
.security
;
5384 ad
.type
= LSM_AUDIT_DATA_IPC
;
5385 ad
.u
.ipc_id
= shp
->shm_perm
.key
;
5387 return avc_has_perm(sid
, isec
->sid
, SECCLASS_SHM
,
5388 SHM__ASSOCIATE
, &ad
);
5391 /* Note, at this point, shp is locked down */
5392 static int selinux_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
5400 /* No specific object, just general system-wide information. */
5401 return task_has_system(current
, SYSTEM__IPC_INFO
);
5404 perms
= SHM__GETATTR
| SHM__ASSOCIATE
;
5407 perms
= SHM__SETATTR
;
5414 perms
= SHM__DESTROY
;
5420 err
= ipc_has_perm(&shp
->shm_perm
, perms
);
5424 static int selinux_shm_shmat(struct shmid_kernel
*shp
,
5425 char __user
*shmaddr
, int shmflg
)
5429 if (shmflg
& SHM_RDONLY
)
5432 perms
= SHM__READ
| SHM__WRITE
;
5434 return ipc_has_perm(&shp
->shm_perm
, perms
);
5437 /* Semaphore security operations */
5438 static int selinux_sem_alloc_security(struct sem_array
*sma
)
5440 struct ipc_security_struct
*isec
;
5441 struct common_audit_data ad
;
5442 u32 sid
= current_sid();
5445 rc
= ipc_alloc_security(current
, &sma
->sem_perm
, SECCLASS_SEM
);
5449 isec
= sma
->sem_perm
.security
;
5451 ad
.type
= LSM_AUDIT_DATA_IPC
;
5452 ad
.u
.ipc_id
= sma
->sem_perm
.key
;
5454 rc
= avc_has_perm(sid
, isec
->sid
, SECCLASS_SEM
,
5457 ipc_free_security(&sma
->sem_perm
);
5463 static void selinux_sem_free_security(struct sem_array
*sma
)
5465 ipc_free_security(&sma
->sem_perm
);
5468 static int selinux_sem_associate(struct sem_array
*sma
, int semflg
)
5470 struct ipc_security_struct
*isec
;
5471 struct common_audit_data ad
;
5472 u32 sid
= current_sid();
5474 isec
= sma
->sem_perm
.security
;
5476 ad
.type
= LSM_AUDIT_DATA_IPC
;
5477 ad
.u
.ipc_id
= sma
->sem_perm
.key
;
5479 return avc_has_perm(sid
, isec
->sid
, SECCLASS_SEM
,
5480 SEM__ASSOCIATE
, &ad
);
5483 /* Note, at this point, sma is locked down */
5484 static int selinux_sem_semctl(struct sem_array
*sma
, int cmd
)
5492 /* No specific object, just general system-wide information. */
5493 return task_has_system(current
, SYSTEM__IPC_INFO
);
5497 perms
= SEM__GETATTR
;
5508 perms
= SEM__DESTROY
;
5511 perms
= SEM__SETATTR
;
5515 perms
= SEM__GETATTR
| SEM__ASSOCIATE
;
5521 err
= ipc_has_perm(&sma
->sem_perm
, perms
);
5525 static int selinux_sem_semop(struct sem_array
*sma
,
5526 struct sembuf
*sops
, unsigned nsops
, int alter
)
5531 perms
= SEM__READ
| SEM__WRITE
;
5535 return ipc_has_perm(&sma
->sem_perm
, perms
);
5538 static int selinux_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
5544 av
|= IPC__UNIX_READ
;
5546 av
|= IPC__UNIX_WRITE
;
5551 return ipc_has_perm(ipcp
, av
);
5554 static void selinux_ipc_getsecid(struct kern_ipc_perm
*ipcp
, u32
*secid
)
5556 struct ipc_security_struct
*isec
= ipcp
->security
;
5560 static void selinux_d_instantiate(struct dentry
*dentry
, struct inode
*inode
)
5563 inode_doinit_with_dentry(inode
, dentry
);
5566 static int selinux_getprocattr(struct task_struct
*p
,
5567 char *name
, char **value
)
5569 const struct task_security_struct
*__tsec
;
5575 error
= current_has_perm(p
, PROCESS__GETATTR
);
5581 __tsec
= __task_cred(p
)->security
;
5583 if (!strcmp(name
, "current"))
5585 else if (!strcmp(name
, "prev"))
5587 else if (!strcmp(name
, "exec"))
5588 sid
= __tsec
->exec_sid
;
5589 else if (!strcmp(name
, "fscreate"))
5590 sid
= __tsec
->create_sid
;
5591 else if (!strcmp(name
, "keycreate"))
5592 sid
= __tsec
->keycreate_sid
;
5593 else if (!strcmp(name
, "sockcreate"))
5594 sid
= __tsec
->sockcreate_sid
;
5602 error
= security_sid_to_context(sid
, value
, &len
);
5612 static int selinux_setprocattr(struct task_struct
*p
,
5613 char *name
, void *value
, size_t size
)
5615 struct task_security_struct
*tsec
;
5616 struct task_struct
*tracer
;
5623 /* SELinux only allows a process to change its own
5624 security attributes. */
5629 * Basic control over ability to set these attributes at all.
5630 * current == p, but we'll pass them separately in case the
5631 * above restriction is ever removed.
5633 if (!strcmp(name
, "exec"))
5634 error
= current_has_perm(p
, PROCESS__SETEXEC
);
5635 else if (!strcmp(name
, "fscreate"))
5636 error
= current_has_perm(p
, PROCESS__SETFSCREATE
);
5637 else if (!strcmp(name
, "keycreate"))
5638 error
= current_has_perm(p
, PROCESS__SETKEYCREATE
);
5639 else if (!strcmp(name
, "sockcreate"))
5640 error
= current_has_perm(p
, PROCESS__SETSOCKCREATE
);
5641 else if (!strcmp(name
, "current"))
5642 error
= current_has_perm(p
, PROCESS__SETCURRENT
);
5648 /* Obtain a SID for the context, if one was specified. */
5649 if (size
&& str
[1] && str
[1] != '\n') {
5650 if (str
[size
-1] == '\n') {
5654 error
= security_context_to_sid(value
, size
, &sid
, GFP_KERNEL
);
5655 if (error
== -EINVAL
&& !strcmp(name
, "fscreate")) {
5656 if (!capable(CAP_MAC_ADMIN
)) {
5657 struct audit_buffer
*ab
;
5660 /* We strip a nul only if it is at the end, otherwise the
5661 * context contains a nul and we should audit that */
5662 if (str
[size
- 1] == '\0')
5663 audit_size
= size
- 1;
5666 ab
= audit_log_start(current
->audit_context
, GFP_ATOMIC
, AUDIT_SELINUX_ERR
);
5667 audit_log_format(ab
, "op=fscreate invalid_context=");
5668 audit_log_n_untrustedstring(ab
, value
, audit_size
);
5673 error
= security_context_to_sid_force(value
, size
,
5680 new = prepare_creds();
5684 /* Permission checking based on the specified context is
5685 performed during the actual operation (execve,
5686 open/mkdir/...), when we know the full context of the
5687 operation. See selinux_bprm_set_creds for the execve
5688 checks and may_create for the file creation checks. The
5689 operation will then fail if the context is not permitted. */
5690 tsec
= new->security
;
5691 if (!strcmp(name
, "exec")) {
5692 tsec
->exec_sid
= sid
;
5693 } else if (!strcmp(name
, "fscreate")) {
5694 tsec
->create_sid
= sid
;
5695 } else if (!strcmp(name
, "keycreate")) {
5696 error
= may_create_key(sid
, p
);
5699 tsec
->keycreate_sid
= sid
;
5700 } else if (!strcmp(name
, "sockcreate")) {
5701 tsec
->sockcreate_sid
= sid
;
5702 } else if (!strcmp(name
, "current")) {
5707 /* Only allow single threaded processes to change context */
5709 if (!current_is_single_threaded()) {
5710 error
= security_bounded_transition(tsec
->sid
, sid
);
5715 /* Check permissions for the transition. */
5716 error
= avc_has_perm(tsec
->sid
, sid
, SECCLASS_PROCESS
,
5717 PROCESS__DYNTRANSITION
, NULL
);
5721 /* Check for ptracing, and update the task SID if ok.
5722 Otherwise, leave SID unchanged and fail. */
5725 tracer
= ptrace_parent(p
);
5727 ptsid
= task_sid(tracer
);
5731 error
= avc_has_perm(ptsid
, sid
, SECCLASS_PROCESS
,
5732 PROCESS__PTRACE
, NULL
);
5751 static int selinux_ismaclabel(const char *name
)
5753 return (strcmp(name
, XATTR_SELINUX_SUFFIX
) == 0);
5756 static int selinux_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
5758 return security_sid_to_context(secid
, secdata
, seclen
);
5761 static int selinux_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
5763 return security_context_to_sid(secdata
, seclen
, secid
, GFP_KERNEL
);
5766 static void selinux_release_secctx(char *secdata
, u32 seclen
)
5772 * called with inode->i_mutex locked
5774 static int selinux_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
5776 return selinux_inode_setsecurity(inode
, XATTR_SELINUX_SUFFIX
, ctx
, ctxlen
, 0);
5780 * called with inode->i_mutex locked
5782 static int selinux_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
5784 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SELINUX
, ctx
, ctxlen
, 0);
5787 static int selinux_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
5790 len
= selinux_inode_getsecurity(inode
, XATTR_SELINUX_SUFFIX
,
5799 static int selinux_key_alloc(struct key
*k
, const struct cred
*cred
,
5800 unsigned long flags
)
5802 const struct task_security_struct
*tsec
;
5803 struct key_security_struct
*ksec
;
5805 ksec
= kzalloc(sizeof(struct key_security_struct
), GFP_KERNEL
);
5809 tsec
= cred
->security
;
5810 if (tsec
->keycreate_sid
)
5811 ksec
->sid
= tsec
->keycreate_sid
;
5813 ksec
->sid
= tsec
->sid
;
5819 static void selinux_key_free(struct key
*k
)
5821 struct key_security_struct
*ksec
= k
->security
;
5827 static int selinux_key_permission(key_ref_t key_ref
,
5828 const struct cred
*cred
,
5832 struct key_security_struct
*ksec
;
5835 /* if no specific permissions are requested, we skip the
5836 permission check. No serious, additional covert channels
5837 appear to be created. */
5841 sid
= cred_sid(cred
);
5843 key
= key_ref_to_ptr(key_ref
);
5844 ksec
= key
->security
;
5846 return avc_has_perm(sid
, ksec
->sid
, SECCLASS_KEY
, perm
, NULL
);
5849 static int selinux_key_getsecurity(struct key
*key
, char **_buffer
)
5851 struct key_security_struct
*ksec
= key
->security
;
5852 char *context
= NULL
;
5856 rc
= security_sid_to_context(ksec
->sid
, &context
, &len
);
5865 static struct security_operations selinux_ops
= {
5868 .binder_set_context_mgr
= selinux_binder_set_context_mgr
,
5869 .binder_transaction
= selinux_binder_transaction
,
5870 .binder_transfer_binder
= selinux_binder_transfer_binder
,
5871 .binder_transfer_file
= selinux_binder_transfer_file
,
5873 .ptrace_access_check
= selinux_ptrace_access_check
,
5874 .ptrace_traceme
= selinux_ptrace_traceme
,
5875 .capget
= selinux_capget
,
5876 .capset
= selinux_capset
,
5877 .capable
= selinux_capable
,
5878 .quotactl
= selinux_quotactl
,
5879 .quota_on
= selinux_quota_on
,
5880 .syslog
= selinux_syslog
,
5881 .vm_enough_memory
= selinux_vm_enough_memory
,
5883 .netlink_send
= selinux_netlink_send
,
5885 .bprm_set_creds
= selinux_bprm_set_creds
,
5886 .bprm_committing_creds
= selinux_bprm_committing_creds
,
5887 .bprm_committed_creds
= selinux_bprm_committed_creds
,
5888 .bprm_secureexec
= selinux_bprm_secureexec
,
5890 .sb_alloc_security
= selinux_sb_alloc_security
,
5891 .sb_free_security
= selinux_sb_free_security
,
5892 .sb_copy_data
= selinux_sb_copy_data
,
5893 .sb_remount
= selinux_sb_remount
,
5894 .sb_kern_mount
= selinux_sb_kern_mount
,
5895 .sb_show_options
= selinux_sb_show_options
,
5896 .sb_statfs
= selinux_sb_statfs
,
5897 .sb_mount
= selinux_mount
,
5898 .sb_umount
= selinux_umount
,
5899 .sb_set_mnt_opts
= selinux_set_mnt_opts
,
5900 .sb_clone_mnt_opts
= selinux_sb_clone_mnt_opts
,
5901 .sb_parse_opts_str
= selinux_parse_opts_str
,
5903 .dentry_init_security
= selinux_dentry_init_security
,
5905 .inode_alloc_security
= selinux_inode_alloc_security
,
5906 .inode_free_security
= selinux_inode_free_security
,
5907 .inode_init_security
= selinux_inode_init_security
,
5908 .inode_create
= selinux_inode_create
,
5909 .inode_link
= selinux_inode_link
,
5910 .inode_unlink
= selinux_inode_unlink
,
5911 .inode_symlink
= selinux_inode_symlink
,
5912 .inode_mkdir
= selinux_inode_mkdir
,
5913 .inode_rmdir
= selinux_inode_rmdir
,
5914 .inode_mknod
= selinux_inode_mknod
,
5915 .inode_rename
= selinux_inode_rename
,
5916 .inode_readlink
= selinux_inode_readlink
,
5917 .inode_follow_link
= selinux_inode_follow_link
,
5918 .inode_permission
= selinux_inode_permission
,
5919 .inode_setattr
= selinux_inode_setattr
,
5920 .inode_getattr
= selinux_inode_getattr
,
5921 .inode_setxattr
= selinux_inode_setxattr
,
5922 .inode_post_setxattr
= selinux_inode_post_setxattr
,
5923 .inode_getxattr
= selinux_inode_getxattr
,
5924 .inode_listxattr
= selinux_inode_listxattr
,
5925 .inode_removexattr
= selinux_inode_removexattr
,
5926 .inode_getsecurity
= selinux_inode_getsecurity
,
5927 .inode_setsecurity
= selinux_inode_setsecurity
,
5928 .inode_listsecurity
= selinux_inode_listsecurity
,
5929 .inode_getsecid
= selinux_inode_getsecid
,
5931 .file_permission
= selinux_file_permission
,
5932 .file_alloc_security
= selinux_file_alloc_security
,
5933 .file_free_security
= selinux_file_free_security
,
5934 .file_ioctl
= selinux_file_ioctl
,
5935 .mmap_file
= selinux_mmap_file
,
5936 .mmap_addr
= selinux_mmap_addr
,
5937 .file_mprotect
= selinux_file_mprotect
,
5938 .file_lock
= selinux_file_lock
,
5939 .file_fcntl
= selinux_file_fcntl
,
5940 .file_set_fowner
= selinux_file_set_fowner
,
5941 .file_send_sigiotask
= selinux_file_send_sigiotask
,
5942 .file_receive
= selinux_file_receive
,
5944 .file_open
= selinux_file_open
,
5946 .task_create
= selinux_task_create
,
5947 .cred_alloc_blank
= selinux_cred_alloc_blank
,
5948 .cred_free
= selinux_cred_free
,
5949 .cred_prepare
= selinux_cred_prepare
,
5950 .cred_transfer
= selinux_cred_transfer
,
5951 .kernel_act_as
= selinux_kernel_act_as
,
5952 .kernel_create_files_as
= selinux_kernel_create_files_as
,
5953 .kernel_module_request
= selinux_kernel_module_request
,
5954 .task_setpgid
= selinux_task_setpgid
,
5955 .task_getpgid
= selinux_task_getpgid
,
5956 .task_getsid
= selinux_task_getsid
,
5957 .task_getsecid
= selinux_task_getsecid
,
5958 .task_setnice
= selinux_task_setnice
,
5959 .task_setioprio
= selinux_task_setioprio
,
5960 .task_getioprio
= selinux_task_getioprio
,
5961 .task_setrlimit
= selinux_task_setrlimit
,
5962 .task_setscheduler
= selinux_task_setscheduler
,
5963 .task_getscheduler
= selinux_task_getscheduler
,
5964 .task_movememory
= selinux_task_movememory
,
5965 .task_kill
= selinux_task_kill
,
5966 .task_wait
= selinux_task_wait
,
5967 .task_to_inode
= selinux_task_to_inode
,
5969 .ipc_permission
= selinux_ipc_permission
,
5970 .ipc_getsecid
= selinux_ipc_getsecid
,
5972 .msg_msg_alloc_security
= selinux_msg_msg_alloc_security
,
5973 .msg_msg_free_security
= selinux_msg_msg_free_security
,
5975 .msg_queue_alloc_security
= selinux_msg_queue_alloc_security
,
5976 .msg_queue_free_security
= selinux_msg_queue_free_security
,
5977 .msg_queue_associate
= selinux_msg_queue_associate
,
5978 .msg_queue_msgctl
= selinux_msg_queue_msgctl
,
5979 .msg_queue_msgsnd
= selinux_msg_queue_msgsnd
,
5980 .msg_queue_msgrcv
= selinux_msg_queue_msgrcv
,
5982 .shm_alloc_security
= selinux_shm_alloc_security
,
5983 .shm_free_security
= selinux_shm_free_security
,
5984 .shm_associate
= selinux_shm_associate
,
5985 .shm_shmctl
= selinux_shm_shmctl
,
5986 .shm_shmat
= selinux_shm_shmat
,
5988 .sem_alloc_security
= selinux_sem_alloc_security
,
5989 .sem_free_security
= selinux_sem_free_security
,
5990 .sem_associate
= selinux_sem_associate
,
5991 .sem_semctl
= selinux_sem_semctl
,
5992 .sem_semop
= selinux_sem_semop
,
5994 .d_instantiate
= selinux_d_instantiate
,
5996 .getprocattr
= selinux_getprocattr
,
5997 .setprocattr
= selinux_setprocattr
,
5999 .ismaclabel
= selinux_ismaclabel
,
6000 .secid_to_secctx
= selinux_secid_to_secctx
,
6001 .secctx_to_secid
= selinux_secctx_to_secid
,
6002 .release_secctx
= selinux_release_secctx
,
6003 .inode_notifysecctx
= selinux_inode_notifysecctx
,
6004 .inode_setsecctx
= selinux_inode_setsecctx
,
6005 .inode_getsecctx
= selinux_inode_getsecctx
,
6007 .unix_stream_connect
= selinux_socket_unix_stream_connect
,
6008 .unix_may_send
= selinux_socket_unix_may_send
,
6010 .socket_create
= selinux_socket_create
,
6011 .socket_post_create
= selinux_socket_post_create
,
6012 .socket_bind
= selinux_socket_bind
,
6013 .socket_connect
= selinux_socket_connect
,
6014 .socket_listen
= selinux_socket_listen
,
6015 .socket_accept
= selinux_socket_accept
,
6016 .socket_sendmsg
= selinux_socket_sendmsg
,
6017 .socket_recvmsg
= selinux_socket_recvmsg
,
6018 .socket_getsockname
= selinux_socket_getsockname
,
6019 .socket_getpeername
= selinux_socket_getpeername
,
6020 .socket_getsockopt
= selinux_socket_getsockopt
,
6021 .socket_setsockopt
= selinux_socket_setsockopt
,
6022 .socket_shutdown
= selinux_socket_shutdown
,
6023 .socket_sock_rcv_skb
= selinux_socket_sock_rcv_skb
,
6024 .socket_getpeersec_stream
= selinux_socket_getpeersec_stream
,
6025 .socket_getpeersec_dgram
= selinux_socket_getpeersec_dgram
,
6026 .sk_alloc_security
= selinux_sk_alloc_security
,
6027 .sk_free_security
= selinux_sk_free_security
,
6028 .sk_clone_security
= selinux_sk_clone_security
,
6029 .sk_getsecid
= selinux_sk_getsecid
,
6030 .sock_graft
= selinux_sock_graft
,
6031 .inet_conn_request
= selinux_inet_conn_request
,
6032 .inet_csk_clone
= selinux_inet_csk_clone
,
6033 .inet_conn_established
= selinux_inet_conn_established
,
6034 .secmark_relabel_packet
= selinux_secmark_relabel_packet
,
6035 .secmark_refcount_inc
= selinux_secmark_refcount_inc
,
6036 .secmark_refcount_dec
= selinux_secmark_refcount_dec
,
6037 .req_classify_flow
= selinux_req_classify_flow
,
6038 .tun_dev_alloc_security
= selinux_tun_dev_alloc_security
,
6039 .tun_dev_free_security
= selinux_tun_dev_free_security
,
6040 .tun_dev_create
= selinux_tun_dev_create
,
6041 .tun_dev_attach_queue
= selinux_tun_dev_attach_queue
,
6042 .tun_dev_attach
= selinux_tun_dev_attach
,
6043 .tun_dev_open
= selinux_tun_dev_open
,
6044 .skb_owned_by
= selinux_skb_owned_by
,
6046 #ifdef CONFIG_SECURITY_NETWORK_XFRM
6047 .xfrm_policy_alloc_security
= selinux_xfrm_policy_alloc
,
6048 .xfrm_policy_clone_security
= selinux_xfrm_policy_clone
,
6049 .xfrm_policy_free_security
= selinux_xfrm_policy_free
,
6050 .xfrm_policy_delete_security
= selinux_xfrm_policy_delete
,
6051 .xfrm_state_alloc
= selinux_xfrm_state_alloc
,
6052 .xfrm_state_alloc_acquire
= selinux_xfrm_state_alloc_acquire
,
6053 .xfrm_state_free_security
= selinux_xfrm_state_free
,
6054 .xfrm_state_delete_security
= selinux_xfrm_state_delete
,
6055 .xfrm_policy_lookup
= selinux_xfrm_policy_lookup
,
6056 .xfrm_state_pol_flow_match
= selinux_xfrm_state_pol_flow_match
,
6057 .xfrm_decode_session
= selinux_xfrm_decode_session
,
6061 .key_alloc
= selinux_key_alloc
,
6062 .key_free
= selinux_key_free
,
6063 .key_permission
= selinux_key_permission
,
6064 .key_getsecurity
= selinux_key_getsecurity
,
6068 .audit_rule_init
= selinux_audit_rule_init
,
6069 .audit_rule_known
= selinux_audit_rule_known
,
6070 .audit_rule_match
= selinux_audit_rule_match
,
6071 .audit_rule_free
= selinux_audit_rule_free
,
6075 static __init
int selinux_init(void)
6077 if (!security_module_enable(&selinux_ops
)) {
6078 selinux_enabled
= 0;
6082 if (!selinux_enabled
) {
6083 printk(KERN_INFO
"SELinux: Disabled at boot.\n");
6087 printk(KERN_INFO
"SELinux: Initializing.\n");
6089 /* Set the security state for the initial task. */
6090 cred_init_security();
6092 default_noexec
= !(VM_DATA_DEFAULT_FLAGS
& VM_EXEC
);
6094 sel_inode_cache
= kmem_cache_create("selinux_inode_security",
6095 sizeof(struct inode_security_struct
),
6096 0, SLAB_PANIC
, NULL
);
6099 if (register_security(&selinux_ops
))
6100 panic("SELinux: Unable to register with kernel.\n");
6102 if (avc_add_callback(selinux_netcache_avc_callback
, AVC_CALLBACK_RESET
))
6103 panic("SELinux: Unable to register AVC netcache callback\n");
6105 if (selinux_enforcing
)
6106 printk(KERN_DEBUG
"SELinux: Starting in enforcing mode\n");
6108 printk(KERN_DEBUG
"SELinux: Starting in permissive mode\n");
6113 static void delayed_superblock_init(struct super_block
*sb
, void *unused
)
6115 superblock_doinit(sb
, NULL
);
6118 void selinux_complete_init(void)
6120 printk(KERN_DEBUG
"SELinux: Completing initialization.\n");
6122 /* Set up any superblocks initialized prior to the policy load. */
6123 printk(KERN_DEBUG
"SELinux: Setting up existing superblocks.\n");
6124 iterate_supers(delayed_superblock_init
, NULL
);
6127 /* SELinux requires early initialization in order to label
6128 all processes and objects when they are created. */
6129 security_initcall(selinux_init
);
6131 #if defined(CONFIG_NETFILTER)
6133 static struct nf_hook_ops selinux_nf_ops
[] = {
6135 .hook
= selinux_ipv4_postroute
,
6136 .owner
= THIS_MODULE
,
6138 .hooknum
= NF_INET_POST_ROUTING
,
6139 .priority
= NF_IP_PRI_SELINUX_LAST
,
6142 .hook
= selinux_ipv4_forward
,
6143 .owner
= THIS_MODULE
,
6145 .hooknum
= NF_INET_FORWARD
,
6146 .priority
= NF_IP_PRI_SELINUX_FIRST
,
6149 .hook
= selinux_ipv4_output
,
6150 .owner
= THIS_MODULE
,
6152 .hooknum
= NF_INET_LOCAL_OUT
,
6153 .priority
= NF_IP_PRI_SELINUX_FIRST
,
6155 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6157 .hook
= selinux_ipv6_postroute
,
6158 .owner
= THIS_MODULE
,
6160 .hooknum
= NF_INET_POST_ROUTING
,
6161 .priority
= NF_IP6_PRI_SELINUX_LAST
,
6164 .hook
= selinux_ipv6_forward
,
6165 .owner
= THIS_MODULE
,
6167 .hooknum
= NF_INET_FORWARD
,
6168 .priority
= NF_IP6_PRI_SELINUX_FIRST
,
6173 static int __init
selinux_nf_ip_init(void)
6177 if (!selinux_enabled
)
6180 printk(KERN_DEBUG
"SELinux: Registering netfilter hooks\n");
6182 err
= nf_register_hooks(selinux_nf_ops
, ARRAY_SIZE(selinux_nf_ops
));
6184 panic("SELinux: nf_register_hooks: error %d\n", err
);
6189 __initcall(selinux_nf_ip_init
);
6191 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6192 static void selinux_nf_ip_exit(void)
6194 printk(KERN_DEBUG
"SELinux: Unregistering netfilter hooks\n");
6196 nf_unregister_hooks(selinux_nf_ops
, ARRAY_SIZE(selinux_nf_ops
));
6200 #else /* CONFIG_NETFILTER */
6202 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6203 #define selinux_nf_ip_exit()
6206 #endif /* CONFIG_NETFILTER */
6208 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6209 static int selinux_disabled
;
6211 int selinux_disable(void)
6213 if (ss_initialized
) {
6214 /* Not permitted after initial policy load. */
6218 if (selinux_disabled
) {
6219 /* Only do this once. */
6223 printk(KERN_INFO
"SELinux: Disabled at runtime.\n");
6225 selinux_disabled
= 1;
6226 selinux_enabled
= 0;
6228 reset_security_ops();
6230 /* Try to destroy the avc node cache */
6233 /* Unregister netfilter hooks. */
6234 selinux_nf_ip_exit();
6236 /* Unregister selinuxfs. */