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 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
14 * <dgoeddel@trustedcs.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/ptrace.h>
25 #include <linux/errno.h>
26 #include <linux/sched.h>
27 #include <linux/security.h>
28 #include <linux/xattr.h>
29 #include <linux/capability.h>
30 #include <linux/unistd.h>
32 #include <linux/mman.h>
33 #include <linux/slab.h>
34 #include <linux/pagemap.h>
35 #include <linux/swap.h>
36 #include <linux/smp_lock.h>
37 #include <linux/spinlock.h>
38 #include <linux/syscalls.h>
39 #include <linux/file.h>
40 #include <linux/namei.h>
41 #include <linux/mount.h>
42 #include <linux/ext2_fs.h>
43 #include <linux/proc_fs.h>
45 #include <linux/netfilter_ipv4.h>
46 #include <linux/netfilter_ipv6.h>
47 #include <linux/tty.h>
49 #include <net/ip.h> /* for sysctl_local_port_range[] */
50 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
51 #include <asm/uaccess.h>
52 #include <asm/semaphore.h>
53 #include <asm/ioctls.h>
54 #include <linux/bitops.h>
55 #include <linux/interrupt.h>
56 #include <linux/netdevice.h> /* for network interface checks */
57 #include <linux/netlink.h>
58 #include <linux/tcp.h>
59 #include <linux/udp.h>
60 #include <linux/quota.h>
61 #include <linux/un.h> /* for Unix socket types */
62 #include <net/af_unix.h> /* for Unix socket types */
63 #include <linux/parser.h>
64 #include <linux/nfs_mount.h>
66 #include <linux/hugetlb.h>
67 #include <linux/personality.h>
68 #include <linux/sysctl.h>
69 #include <linux/audit.h>
70 #include <linux/string.h>
71 #include <linux/selinux.h>
78 #define XATTR_SELINUX_SUFFIX "selinux"
79 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
81 extern unsigned int policydb_loaded_version
;
82 extern int selinux_nlmsg_lookup(u16 sclass
, u16 nlmsg_type
, u32
*perm
);
83 extern int selinux_compat_net
;
85 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
86 int selinux_enforcing
= 0;
88 static int __init
enforcing_setup(char *str
)
90 selinux_enforcing
= simple_strtol(str
,NULL
,0);
93 __setup("enforcing=", enforcing_setup
);
96 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
97 int selinux_enabled
= CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE
;
99 static int __init
selinux_enabled_setup(char *str
)
101 selinux_enabled
= simple_strtol(str
, NULL
, 0);
104 __setup("selinux=", selinux_enabled_setup
);
106 int selinux_enabled
= 1;
109 /* Original (dummy) security module. */
110 static struct security_operations
*original_ops
= NULL
;
112 /* Minimal support for a secondary security module,
113 just to allow the use of the dummy or capability modules.
114 The owlsm module can alternatively be used as a secondary
115 module as long as CONFIG_OWLSM_FD is not enabled. */
116 static struct security_operations
*secondary_ops
= NULL
;
118 /* Lists of inode and superblock security structures initialized
119 before the policy was loaded. */
120 static LIST_HEAD(superblock_security_head
);
121 static DEFINE_SPINLOCK(sb_security_lock
);
123 static kmem_cache_t
*sel_inode_cache
;
125 /* Return security context for a given sid or just the context
126 length if the buffer is null or length is 0 */
127 static int selinux_getsecurity(u32 sid
, void *buffer
, size_t size
)
133 rc
= security_sid_to_context(sid
, &context
, &len
);
137 if (!buffer
|| !size
)
138 goto getsecurity_exit
;
142 goto getsecurity_exit
;
144 memcpy(buffer
, context
, len
);
151 /* Allocate and free functions for each kind of security blob. */
153 static int task_alloc_security(struct task_struct
*task
)
155 struct task_security_struct
*tsec
;
157 tsec
= kzalloc(sizeof(struct task_security_struct
), GFP_KERNEL
);
162 tsec
->osid
= tsec
->sid
= tsec
->ptrace_sid
= SECINITSID_UNLABELED
;
163 task
->security
= tsec
;
168 static void task_free_security(struct task_struct
*task
)
170 struct task_security_struct
*tsec
= task
->security
;
171 task
->security
= NULL
;
175 static int inode_alloc_security(struct inode
*inode
)
177 struct task_security_struct
*tsec
= current
->security
;
178 struct inode_security_struct
*isec
;
180 isec
= kmem_cache_alloc(sel_inode_cache
, SLAB_KERNEL
);
184 memset(isec
, 0, sizeof(*isec
));
185 init_MUTEX(&isec
->sem
);
186 INIT_LIST_HEAD(&isec
->list
);
188 isec
->sid
= SECINITSID_UNLABELED
;
189 isec
->sclass
= SECCLASS_FILE
;
190 isec
->task_sid
= tsec
->sid
;
191 inode
->i_security
= isec
;
196 static void inode_free_security(struct inode
*inode
)
198 struct inode_security_struct
*isec
= inode
->i_security
;
199 struct superblock_security_struct
*sbsec
= inode
->i_sb
->s_security
;
201 spin_lock(&sbsec
->isec_lock
);
202 if (!list_empty(&isec
->list
))
203 list_del_init(&isec
->list
);
204 spin_unlock(&sbsec
->isec_lock
);
206 inode
->i_security
= NULL
;
207 kmem_cache_free(sel_inode_cache
, isec
);
210 static int file_alloc_security(struct file
*file
)
212 struct task_security_struct
*tsec
= current
->security
;
213 struct file_security_struct
*fsec
;
215 fsec
= kzalloc(sizeof(struct file_security_struct
), GFP_KERNEL
);
220 fsec
->sid
= tsec
->sid
;
221 fsec
->fown_sid
= tsec
->sid
;
222 file
->f_security
= fsec
;
227 static void file_free_security(struct file
*file
)
229 struct file_security_struct
*fsec
= file
->f_security
;
230 file
->f_security
= NULL
;
234 static int superblock_alloc_security(struct super_block
*sb
)
236 struct superblock_security_struct
*sbsec
;
238 sbsec
= kzalloc(sizeof(struct superblock_security_struct
), GFP_KERNEL
);
242 init_MUTEX(&sbsec
->sem
);
243 INIT_LIST_HEAD(&sbsec
->list
);
244 INIT_LIST_HEAD(&sbsec
->isec_head
);
245 spin_lock_init(&sbsec
->isec_lock
);
247 sbsec
->sid
= SECINITSID_UNLABELED
;
248 sbsec
->def_sid
= SECINITSID_FILE
;
249 sbsec
->mntpoint_sid
= SECINITSID_UNLABELED
;
250 sb
->s_security
= sbsec
;
255 static void superblock_free_security(struct super_block
*sb
)
257 struct superblock_security_struct
*sbsec
= sb
->s_security
;
259 spin_lock(&sb_security_lock
);
260 if (!list_empty(&sbsec
->list
))
261 list_del_init(&sbsec
->list
);
262 spin_unlock(&sb_security_lock
);
264 sb
->s_security
= NULL
;
268 static int sk_alloc_security(struct sock
*sk
, int family
, gfp_t priority
)
270 struct sk_security_struct
*ssec
;
272 ssec
= kzalloc(sizeof(*ssec
), priority
);
277 ssec
->peer_sid
= SECINITSID_UNLABELED
;
278 ssec
->sid
= SECINITSID_UNLABELED
;
279 sk
->sk_security
= ssec
;
284 static void sk_free_security(struct sock
*sk
)
286 struct sk_security_struct
*ssec
= sk
->sk_security
;
288 sk
->sk_security
= NULL
;
292 /* The security server must be initialized before
293 any labeling or access decisions can be provided. */
294 extern int ss_initialized
;
296 /* The file system's label must be initialized prior to use. */
298 static char *labeling_behaviors
[6] = {
300 "uses transition SIDs",
302 "uses genfs_contexts",
303 "not configured for labeling",
304 "uses mountpoint labeling",
307 static int inode_doinit_with_dentry(struct inode
*inode
, struct dentry
*opt_dentry
);
309 static inline int inode_doinit(struct inode
*inode
)
311 return inode_doinit_with_dentry(inode
, NULL
);
321 static match_table_t tokens
= {
322 {Opt_context
, "context=%s"},
323 {Opt_fscontext
, "fscontext=%s"},
324 {Opt_defcontext
, "defcontext=%s"},
325 {Opt_rootcontext
, "rootcontext=%s"},
328 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
330 static int may_context_mount_sb_relabel(u32 sid
,
331 struct superblock_security_struct
*sbsec
,
332 struct task_security_struct
*tsec
)
336 rc
= avc_has_perm(tsec
->sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
337 FILESYSTEM__RELABELFROM
, NULL
);
341 rc
= avc_has_perm(tsec
->sid
, sid
, SECCLASS_FILESYSTEM
,
342 FILESYSTEM__RELABELTO
, NULL
);
346 static int may_context_mount_inode_relabel(u32 sid
,
347 struct superblock_security_struct
*sbsec
,
348 struct task_security_struct
*tsec
)
351 rc
= avc_has_perm(tsec
->sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
352 FILESYSTEM__RELABELFROM
, NULL
);
356 rc
= avc_has_perm(sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
357 FILESYSTEM__ASSOCIATE
, NULL
);
361 static int try_context_mount(struct super_block
*sb
, void *data
)
363 char *context
= NULL
, *defcontext
= NULL
;
364 char *fscontext
= NULL
, *rootcontext
= NULL
;
367 int alloc
= 0, rc
= 0, seen
= 0;
368 struct task_security_struct
*tsec
= current
->security
;
369 struct superblock_security_struct
*sbsec
= sb
->s_security
;
374 name
= sb
->s_type
->name
;
376 if (sb
->s_type
->fs_flags
& FS_BINARY_MOUNTDATA
) {
378 /* NFS we understand. */
379 if (!strcmp(name
, "nfs")) {
380 struct nfs_mount_data
*d
= data
;
382 if (d
->version
< NFS_MOUNT_VERSION
)
386 context
= d
->context
;
393 /* Standard string-based options. */
394 char *p
, *options
= data
;
396 while ((p
= strsep(&options
, ",")) != NULL
) {
398 substring_t args
[MAX_OPT_ARGS
];
403 token
= match_token(p
, tokens
, args
);
407 if (seen
& (Opt_context
|Opt_defcontext
)) {
409 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
412 context
= match_strdup(&args
[0]);
423 if (seen
& Opt_fscontext
) {
425 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
428 fscontext
= match_strdup(&args
[0]);
435 seen
|= Opt_fscontext
;
438 case Opt_rootcontext
:
439 if (seen
& Opt_rootcontext
) {
441 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
444 rootcontext
= match_strdup(&args
[0]);
451 seen
|= Opt_rootcontext
;
455 if (sbsec
->behavior
!= SECURITY_FS_USE_XATTR
) {
457 printk(KERN_WARNING
"SELinux: "
458 "defcontext option is invalid "
459 "for this filesystem type\n");
462 if (seen
& (Opt_context
|Opt_defcontext
)) {
464 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG
);
467 defcontext
= match_strdup(&args
[0]);
474 seen
|= Opt_defcontext
;
479 printk(KERN_WARNING
"SELinux: unknown mount "
490 /* sets the context of the superblock for the fs being mounted. */
492 rc
= security_context_to_sid(fscontext
, strlen(fscontext
), &sid
);
494 printk(KERN_WARNING
"SELinux: security_context_to_sid"
495 "(%s) failed for (dev %s, type %s) errno=%d\n",
496 fscontext
, sb
->s_id
, name
, rc
);
500 rc
= may_context_mount_sb_relabel(sid
, sbsec
, tsec
);
508 * Switch to using mount point labeling behavior.
509 * sets the label used on all file below the mountpoint, and will set
510 * the superblock context if not already set.
513 rc
= security_context_to_sid(context
, strlen(context
), &sid
);
515 printk(KERN_WARNING
"SELinux: security_context_to_sid"
516 "(%s) failed for (dev %s, type %s) errno=%d\n",
517 context
, sb
->s_id
, name
, rc
);
522 rc
= may_context_mount_sb_relabel(sid
, sbsec
, tsec
);
527 rc
= may_context_mount_inode_relabel(sid
, sbsec
, tsec
);
531 sbsec
->mntpoint_sid
= sid
;
533 sbsec
->behavior
= SECURITY_FS_USE_MNTPOINT
;
537 struct inode
*inode
= sb
->s_root
->d_inode
;
538 struct inode_security_struct
*isec
= inode
->i_security
;
539 rc
= security_context_to_sid(rootcontext
, strlen(rootcontext
), &sid
);
541 printk(KERN_WARNING
"SELinux: security_context_to_sid"
542 "(%s) failed for (dev %s, type %s) errno=%d\n",
543 rootcontext
, sb
->s_id
, name
, rc
);
547 rc
= may_context_mount_inode_relabel(sid
, sbsec
, tsec
);
552 isec
->initialized
= 1;
556 rc
= security_context_to_sid(defcontext
, strlen(defcontext
), &sid
);
558 printk(KERN_WARNING
"SELinux: security_context_to_sid"
559 "(%s) failed for (dev %s, type %s) errno=%d\n",
560 defcontext
, sb
->s_id
, name
, rc
);
564 if (sid
== sbsec
->def_sid
)
567 rc
= may_context_mount_inode_relabel(sid
, sbsec
, tsec
);
571 sbsec
->def_sid
= sid
;
585 static int superblock_doinit(struct super_block
*sb
, void *data
)
587 struct superblock_security_struct
*sbsec
= sb
->s_security
;
588 struct dentry
*root
= sb
->s_root
;
589 struct inode
*inode
= root
->d_inode
;
593 if (sbsec
->initialized
)
596 if (!ss_initialized
) {
597 /* Defer initialization until selinux_complete_init,
598 after the initial policy is loaded and the security
599 server is ready to handle calls. */
600 spin_lock(&sb_security_lock
);
601 if (list_empty(&sbsec
->list
))
602 list_add(&sbsec
->list
, &superblock_security_head
);
603 spin_unlock(&sb_security_lock
);
607 /* Determine the labeling behavior to use for this filesystem type. */
608 rc
= security_fs_use(sb
->s_type
->name
, &sbsec
->behavior
, &sbsec
->sid
);
610 printk(KERN_WARNING
"%s: security_fs_use(%s) returned %d\n",
611 __FUNCTION__
, sb
->s_type
->name
, rc
);
615 rc
= try_context_mount(sb
, data
);
619 if (sbsec
->behavior
== SECURITY_FS_USE_XATTR
) {
620 /* Make sure that the xattr handler exists and that no
621 error other than -ENODATA is returned by getxattr on
622 the root directory. -ENODATA is ok, as this may be
623 the first boot of the SELinux kernel before we have
624 assigned xattr values to the filesystem. */
625 if (!inode
->i_op
->getxattr
) {
626 printk(KERN_WARNING
"SELinux: (dev %s, type %s) has no "
627 "xattr support\n", sb
->s_id
, sb
->s_type
->name
);
631 rc
= inode
->i_op
->getxattr(root
, XATTR_NAME_SELINUX
, NULL
, 0);
632 if (rc
< 0 && rc
!= -ENODATA
) {
633 if (rc
== -EOPNOTSUPP
)
634 printk(KERN_WARNING
"SELinux: (dev %s, type "
635 "%s) has no security xattr handler\n",
636 sb
->s_id
, sb
->s_type
->name
);
638 printk(KERN_WARNING
"SELinux: (dev %s, type "
639 "%s) getxattr errno %d\n", sb
->s_id
,
640 sb
->s_type
->name
, -rc
);
645 if (strcmp(sb
->s_type
->name
, "proc") == 0)
648 sbsec
->initialized
= 1;
650 if (sbsec
->behavior
> ARRAY_SIZE(labeling_behaviors
)) {
651 printk(KERN_INFO
"SELinux: initialized (dev %s, type %s), unknown behavior\n",
652 sb
->s_id
, sb
->s_type
->name
);
655 printk(KERN_INFO
"SELinux: initialized (dev %s, type %s), %s\n",
656 sb
->s_id
, sb
->s_type
->name
,
657 labeling_behaviors
[sbsec
->behavior
-1]);
660 /* Initialize the root inode. */
661 rc
= inode_doinit_with_dentry(sb
->s_root
->d_inode
, sb
->s_root
);
663 /* Initialize any other inodes associated with the superblock, e.g.
664 inodes created prior to initial policy load or inodes created
665 during get_sb by a pseudo filesystem that directly
667 spin_lock(&sbsec
->isec_lock
);
669 if (!list_empty(&sbsec
->isec_head
)) {
670 struct inode_security_struct
*isec
=
671 list_entry(sbsec
->isec_head
.next
,
672 struct inode_security_struct
, list
);
673 struct inode
*inode
= isec
->inode
;
674 spin_unlock(&sbsec
->isec_lock
);
675 inode
= igrab(inode
);
677 if (!IS_PRIVATE (inode
))
681 spin_lock(&sbsec
->isec_lock
);
682 list_del_init(&isec
->list
);
685 spin_unlock(&sbsec
->isec_lock
);
691 static inline u16
inode_mode_to_security_class(umode_t mode
)
693 switch (mode
& S_IFMT
) {
695 return SECCLASS_SOCK_FILE
;
697 return SECCLASS_LNK_FILE
;
699 return SECCLASS_FILE
;
701 return SECCLASS_BLK_FILE
;
705 return SECCLASS_CHR_FILE
;
707 return SECCLASS_FIFO_FILE
;
711 return SECCLASS_FILE
;
714 static inline int default_protocol_stream(int protocol
)
716 return (protocol
== IPPROTO_IP
|| protocol
== IPPROTO_TCP
);
719 static inline int default_protocol_dgram(int protocol
)
721 return (protocol
== IPPROTO_IP
|| protocol
== IPPROTO_UDP
);
724 static inline u16
socket_type_to_security_class(int family
, int type
, int protocol
)
731 return SECCLASS_UNIX_STREAM_SOCKET
;
733 return SECCLASS_UNIX_DGRAM_SOCKET
;
740 if (default_protocol_stream(protocol
))
741 return SECCLASS_TCP_SOCKET
;
743 return SECCLASS_RAWIP_SOCKET
;
745 if (default_protocol_dgram(protocol
))
746 return SECCLASS_UDP_SOCKET
;
748 return SECCLASS_RAWIP_SOCKET
;
750 return SECCLASS_RAWIP_SOCKET
;
756 return SECCLASS_NETLINK_ROUTE_SOCKET
;
757 case NETLINK_FIREWALL
:
758 return SECCLASS_NETLINK_FIREWALL_SOCKET
;
759 case NETLINK_INET_DIAG
:
760 return SECCLASS_NETLINK_TCPDIAG_SOCKET
;
762 return SECCLASS_NETLINK_NFLOG_SOCKET
;
764 return SECCLASS_NETLINK_XFRM_SOCKET
;
765 case NETLINK_SELINUX
:
766 return SECCLASS_NETLINK_SELINUX_SOCKET
;
768 return SECCLASS_NETLINK_AUDIT_SOCKET
;
770 return SECCLASS_NETLINK_IP6FW_SOCKET
;
771 case NETLINK_DNRTMSG
:
772 return SECCLASS_NETLINK_DNRT_SOCKET
;
773 case NETLINK_KOBJECT_UEVENT
:
774 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET
;
776 return SECCLASS_NETLINK_SOCKET
;
779 return SECCLASS_PACKET_SOCKET
;
781 return SECCLASS_KEY_SOCKET
;
783 return SECCLASS_APPLETALK_SOCKET
;
786 return SECCLASS_SOCKET
;
789 #ifdef CONFIG_PROC_FS
790 static int selinux_proc_get_sid(struct proc_dir_entry
*de
,
795 char *buffer
, *path
, *end
;
797 buffer
= (char*)__get_free_page(GFP_KERNEL
);
807 while (de
&& de
!= de
->parent
) {
808 buflen
-= de
->namelen
+ 1;
812 memcpy(end
, de
->name
, de
->namelen
);
817 rc
= security_genfs_sid("proc", path
, tclass
, sid
);
818 free_page((unsigned long)buffer
);
822 static int selinux_proc_get_sid(struct proc_dir_entry
*de
,
830 /* The inode's security attributes must be initialized before first use. */
831 static int inode_doinit_with_dentry(struct inode
*inode
, struct dentry
*opt_dentry
)
833 struct superblock_security_struct
*sbsec
= NULL
;
834 struct inode_security_struct
*isec
= inode
->i_security
;
836 struct dentry
*dentry
;
837 #define INITCONTEXTLEN 255
838 char *context
= NULL
;
843 if (isec
->initialized
)
848 if (isec
->initialized
)
851 sbsec
= inode
->i_sb
->s_security
;
852 if (!sbsec
->initialized
) {
853 /* Defer initialization until selinux_complete_init,
854 after the initial policy is loaded and the security
855 server is ready to handle calls. */
856 spin_lock(&sbsec
->isec_lock
);
857 if (list_empty(&isec
->list
))
858 list_add(&isec
->list
, &sbsec
->isec_head
);
859 spin_unlock(&sbsec
->isec_lock
);
863 switch (sbsec
->behavior
) {
864 case SECURITY_FS_USE_XATTR
:
865 if (!inode
->i_op
->getxattr
) {
866 isec
->sid
= sbsec
->def_sid
;
870 /* Need a dentry, since the xattr API requires one.
871 Life would be simpler if we could just pass the inode. */
873 /* Called from d_instantiate or d_splice_alias. */
874 dentry
= dget(opt_dentry
);
876 /* Called from selinux_complete_init, try to find a dentry. */
877 dentry
= d_find_alias(inode
);
880 printk(KERN_WARNING
"%s: no dentry for dev=%s "
881 "ino=%ld\n", __FUNCTION__
, inode
->i_sb
->s_id
,
886 len
= INITCONTEXTLEN
;
887 context
= kmalloc(len
, GFP_KERNEL
);
893 rc
= inode
->i_op
->getxattr(dentry
, XATTR_NAME_SELINUX
,
896 /* Need a larger buffer. Query for the right size. */
897 rc
= inode
->i_op
->getxattr(dentry
, XATTR_NAME_SELINUX
,
905 context
= kmalloc(len
, GFP_KERNEL
);
911 rc
= inode
->i_op
->getxattr(dentry
,
917 if (rc
!= -ENODATA
) {
918 printk(KERN_WARNING
"%s: getxattr returned "
919 "%d for dev=%s ino=%ld\n", __FUNCTION__
,
920 -rc
, inode
->i_sb
->s_id
, inode
->i_ino
);
924 /* Map ENODATA to the default file SID */
925 sid
= sbsec
->def_sid
;
928 rc
= security_context_to_sid_default(context
, rc
, &sid
,
931 printk(KERN_WARNING
"%s: context_to_sid(%s) "
932 "returned %d for dev=%s ino=%ld\n",
933 __FUNCTION__
, context
, -rc
,
934 inode
->i_sb
->s_id
, inode
->i_ino
);
936 /* Leave with the unlabeled SID */
944 case SECURITY_FS_USE_TASK
:
945 isec
->sid
= isec
->task_sid
;
947 case SECURITY_FS_USE_TRANS
:
948 /* Default to the fs SID. */
949 isec
->sid
= sbsec
->sid
;
951 /* Try to obtain a transition SID. */
952 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
953 rc
= security_transition_sid(isec
->task_sid
,
961 case SECURITY_FS_USE_MNTPOINT
:
962 isec
->sid
= sbsec
->mntpoint_sid
;
965 /* Default to the fs superblock SID. */
966 isec
->sid
= sbsec
->sid
;
969 struct proc_inode
*proci
= PROC_I(inode
);
971 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
972 rc
= selinux_proc_get_sid(proci
->pde
,
983 isec
->initialized
= 1;
986 if (isec
->sclass
== SECCLASS_FILE
)
987 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
994 /* Convert a Linux signal to an access vector. */
995 static inline u32
signal_to_av(int sig
)
1001 /* Commonly granted from child to parent. */
1002 perm
= PROCESS__SIGCHLD
;
1005 /* Cannot be caught or ignored */
1006 perm
= PROCESS__SIGKILL
;
1009 /* Cannot be caught or ignored */
1010 perm
= PROCESS__SIGSTOP
;
1013 /* All other signals. */
1014 perm
= PROCESS__SIGNAL
;
1021 /* Check permission betweeen a pair of tasks, e.g. signal checks,
1022 fork check, ptrace check, etc. */
1023 static int task_has_perm(struct task_struct
*tsk1
,
1024 struct task_struct
*tsk2
,
1027 struct task_security_struct
*tsec1
, *tsec2
;
1029 tsec1
= tsk1
->security
;
1030 tsec2
= tsk2
->security
;
1031 return avc_has_perm(tsec1
->sid
, tsec2
->sid
,
1032 SECCLASS_PROCESS
, perms
, NULL
);
1035 /* Check whether a task is allowed to use a capability. */
1036 static int task_has_capability(struct task_struct
*tsk
,
1039 struct task_security_struct
*tsec
;
1040 struct avc_audit_data ad
;
1042 tsec
= tsk
->security
;
1044 AVC_AUDIT_DATA_INIT(&ad
,CAP
);
1048 return avc_has_perm(tsec
->sid
, tsec
->sid
,
1049 SECCLASS_CAPABILITY
, CAP_TO_MASK(cap
), &ad
);
1052 /* Check whether a task is allowed to use a system operation. */
1053 static int task_has_system(struct task_struct
*tsk
,
1056 struct task_security_struct
*tsec
;
1058 tsec
= tsk
->security
;
1060 return avc_has_perm(tsec
->sid
, SECINITSID_KERNEL
,
1061 SECCLASS_SYSTEM
, perms
, NULL
);
1064 /* Check whether a task has a particular permission to an inode.
1065 The 'adp' parameter is optional and allows other audit
1066 data to be passed (e.g. the dentry). */
1067 static int inode_has_perm(struct task_struct
*tsk
,
1068 struct inode
*inode
,
1070 struct avc_audit_data
*adp
)
1072 struct task_security_struct
*tsec
;
1073 struct inode_security_struct
*isec
;
1074 struct avc_audit_data ad
;
1076 tsec
= tsk
->security
;
1077 isec
= inode
->i_security
;
1081 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1082 ad
.u
.fs
.inode
= inode
;
1085 return avc_has_perm(tsec
->sid
, isec
->sid
, isec
->sclass
, perms
, adp
);
1088 /* Same as inode_has_perm, but pass explicit audit data containing
1089 the dentry to help the auditing code to more easily generate the
1090 pathname if needed. */
1091 static inline int dentry_has_perm(struct task_struct
*tsk
,
1092 struct vfsmount
*mnt
,
1093 struct dentry
*dentry
,
1096 struct inode
*inode
= dentry
->d_inode
;
1097 struct avc_audit_data ad
;
1098 AVC_AUDIT_DATA_INIT(&ad
,FS
);
1100 ad
.u
.fs
.dentry
= dentry
;
1101 return inode_has_perm(tsk
, inode
, av
, &ad
);
1104 /* Check whether a task can use an open file descriptor to
1105 access an inode in a given way. Check access to the
1106 descriptor itself, and then use dentry_has_perm to
1107 check a particular permission to the file.
1108 Access to the descriptor is implicitly granted if it
1109 has the same SID as the process. If av is zero, then
1110 access to the file is not checked, e.g. for cases
1111 where only the descriptor is affected like seek. */
1112 static int file_has_perm(struct task_struct
*tsk
,
1116 struct task_security_struct
*tsec
= tsk
->security
;
1117 struct file_security_struct
*fsec
= file
->f_security
;
1118 struct vfsmount
*mnt
= file
->f_vfsmnt
;
1119 struct dentry
*dentry
= file
->f_dentry
;
1120 struct inode
*inode
= dentry
->d_inode
;
1121 struct avc_audit_data ad
;
1124 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1126 ad
.u
.fs
.dentry
= dentry
;
1128 if (tsec
->sid
!= fsec
->sid
) {
1129 rc
= avc_has_perm(tsec
->sid
, fsec
->sid
,
1137 /* av is zero if only checking access to the descriptor. */
1139 return inode_has_perm(tsk
, inode
, av
, &ad
);
1144 /* Check whether a task can create a file. */
1145 static int may_create(struct inode
*dir
,
1146 struct dentry
*dentry
,
1149 struct task_security_struct
*tsec
;
1150 struct inode_security_struct
*dsec
;
1151 struct superblock_security_struct
*sbsec
;
1153 struct avc_audit_data ad
;
1156 tsec
= current
->security
;
1157 dsec
= dir
->i_security
;
1158 sbsec
= dir
->i_sb
->s_security
;
1160 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1161 ad
.u
.fs
.dentry
= dentry
;
1163 rc
= avc_has_perm(tsec
->sid
, dsec
->sid
, SECCLASS_DIR
,
1164 DIR__ADD_NAME
| DIR__SEARCH
,
1169 if (tsec
->create_sid
&& sbsec
->behavior
!= SECURITY_FS_USE_MNTPOINT
) {
1170 newsid
= tsec
->create_sid
;
1172 rc
= security_transition_sid(tsec
->sid
, dsec
->sid
, tclass
,
1178 rc
= avc_has_perm(tsec
->sid
, newsid
, tclass
, FILE__CREATE
, &ad
);
1182 return avc_has_perm(newsid
, sbsec
->sid
,
1183 SECCLASS_FILESYSTEM
,
1184 FILESYSTEM__ASSOCIATE
, &ad
);
1187 /* Check whether a task can create a key. */
1188 static int may_create_key(u32 ksid
,
1189 struct task_struct
*ctx
)
1191 struct task_security_struct
*tsec
;
1193 tsec
= ctx
->security
;
1195 return avc_has_perm(tsec
->sid
, ksid
, SECCLASS_KEY
, KEY__CREATE
, NULL
);
1199 #define MAY_UNLINK 1
1202 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1203 static int may_link(struct inode
*dir
,
1204 struct dentry
*dentry
,
1208 struct task_security_struct
*tsec
;
1209 struct inode_security_struct
*dsec
, *isec
;
1210 struct avc_audit_data ad
;
1214 tsec
= current
->security
;
1215 dsec
= dir
->i_security
;
1216 isec
= dentry
->d_inode
->i_security
;
1218 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1219 ad
.u
.fs
.dentry
= dentry
;
1222 av
|= (kind
? DIR__REMOVE_NAME
: DIR__ADD_NAME
);
1223 rc
= avc_has_perm(tsec
->sid
, dsec
->sid
, SECCLASS_DIR
, av
, &ad
);
1238 printk(KERN_WARNING
"may_link: unrecognized kind %d\n", kind
);
1242 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, isec
->sclass
, av
, &ad
);
1246 static inline int may_rename(struct inode
*old_dir
,
1247 struct dentry
*old_dentry
,
1248 struct inode
*new_dir
,
1249 struct dentry
*new_dentry
)
1251 struct task_security_struct
*tsec
;
1252 struct inode_security_struct
*old_dsec
, *new_dsec
, *old_isec
, *new_isec
;
1253 struct avc_audit_data ad
;
1255 int old_is_dir
, new_is_dir
;
1258 tsec
= current
->security
;
1259 old_dsec
= old_dir
->i_security
;
1260 old_isec
= old_dentry
->d_inode
->i_security
;
1261 old_is_dir
= S_ISDIR(old_dentry
->d_inode
->i_mode
);
1262 new_dsec
= new_dir
->i_security
;
1264 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1266 ad
.u
.fs
.dentry
= old_dentry
;
1267 rc
= avc_has_perm(tsec
->sid
, old_dsec
->sid
, SECCLASS_DIR
,
1268 DIR__REMOVE_NAME
| DIR__SEARCH
, &ad
);
1271 rc
= avc_has_perm(tsec
->sid
, old_isec
->sid
,
1272 old_isec
->sclass
, FILE__RENAME
, &ad
);
1275 if (old_is_dir
&& new_dir
!= old_dir
) {
1276 rc
= avc_has_perm(tsec
->sid
, old_isec
->sid
,
1277 old_isec
->sclass
, DIR__REPARENT
, &ad
);
1282 ad
.u
.fs
.dentry
= new_dentry
;
1283 av
= DIR__ADD_NAME
| DIR__SEARCH
;
1284 if (new_dentry
->d_inode
)
1285 av
|= DIR__REMOVE_NAME
;
1286 rc
= avc_has_perm(tsec
->sid
, new_dsec
->sid
, SECCLASS_DIR
, av
, &ad
);
1289 if (new_dentry
->d_inode
) {
1290 new_isec
= new_dentry
->d_inode
->i_security
;
1291 new_is_dir
= S_ISDIR(new_dentry
->d_inode
->i_mode
);
1292 rc
= avc_has_perm(tsec
->sid
, new_isec
->sid
,
1294 (new_is_dir
? DIR__RMDIR
: FILE__UNLINK
), &ad
);
1302 /* Check whether a task can perform a filesystem operation. */
1303 static int superblock_has_perm(struct task_struct
*tsk
,
1304 struct super_block
*sb
,
1306 struct avc_audit_data
*ad
)
1308 struct task_security_struct
*tsec
;
1309 struct superblock_security_struct
*sbsec
;
1311 tsec
= tsk
->security
;
1312 sbsec
= sb
->s_security
;
1313 return avc_has_perm(tsec
->sid
, sbsec
->sid
, SECCLASS_FILESYSTEM
,
1317 /* Convert a Linux mode and permission mask to an access vector. */
1318 static inline u32
file_mask_to_av(int mode
, int mask
)
1322 if ((mode
& S_IFMT
) != S_IFDIR
) {
1323 if (mask
& MAY_EXEC
)
1324 av
|= FILE__EXECUTE
;
1325 if (mask
& MAY_READ
)
1328 if (mask
& MAY_APPEND
)
1330 else if (mask
& MAY_WRITE
)
1334 if (mask
& MAY_EXEC
)
1336 if (mask
& MAY_WRITE
)
1338 if (mask
& MAY_READ
)
1345 /* Convert a Linux file to an access vector. */
1346 static inline u32
file_to_av(struct file
*file
)
1350 if (file
->f_mode
& FMODE_READ
)
1352 if (file
->f_mode
& FMODE_WRITE
) {
1353 if (file
->f_flags
& O_APPEND
)
1362 /* Set an inode's SID to a specified value. */
1363 static int inode_security_set_sid(struct inode
*inode
, u32 sid
)
1365 struct inode_security_struct
*isec
= inode
->i_security
;
1366 struct superblock_security_struct
*sbsec
= inode
->i_sb
->s_security
;
1368 if (!sbsec
->initialized
) {
1369 /* Defer initialization to selinux_complete_init. */
1374 isec
->sclass
= inode_mode_to_security_class(inode
->i_mode
);
1376 isec
->initialized
= 1;
1381 /* Hook functions begin here. */
1383 static int selinux_ptrace(struct task_struct
*parent
, struct task_struct
*child
)
1385 struct task_security_struct
*psec
= parent
->security
;
1386 struct task_security_struct
*csec
= child
->security
;
1389 rc
= secondary_ops
->ptrace(parent
,child
);
1393 rc
= task_has_perm(parent
, child
, PROCESS__PTRACE
);
1394 /* Save the SID of the tracing process for later use in apply_creds. */
1395 if (!(child
->ptrace
& PT_PTRACED
) && !rc
)
1396 csec
->ptrace_sid
= psec
->sid
;
1400 static int selinux_capget(struct task_struct
*target
, kernel_cap_t
*effective
,
1401 kernel_cap_t
*inheritable
, kernel_cap_t
*permitted
)
1405 error
= task_has_perm(current
, target
, PROCESS__GETCAP
);
1409 return secondary_ops
->capget(target
, effective
, inheritable
, permitted
);
1412 static int selinux_capset_check(struct task_struct
*target
, kernel_cap_t
*effective
,
1413 kernel_cap_t
*inheritable
, kernel_cap_t
*permitted
)
1417 error
= secondary_ops
->capset_check(target
, effective
, inheritable
, permitted
);
1421 return task_has_perm(current
, target
, PROCESS__SETCAP
);
1424 static void selinux_capset_set(struct task_struct
*target
, kernel_cap_t
*effective
,
1425 kernel_cap_t
*inheritable
, kernel_cap_t
*permitted
)
1427 secondary_ops
->capset_set(target
, effective
, inheritable
, permitted
);
1430 static int selinux_capable(struct task_struct
*tsk
, int cap
)
1434 rc
= secondary_ops
->capable(tsk
, cap
);
1438 return task_has_capability(tsk
,cap
);
1441 static int selinux_sysctl(ctl_table
*table
, int op
)
1445 struct task_security_struct
*tsec
;
1449 rc
= secondary_ops
->sysctl(table
, op
);
1453 tsec
= current
->security
;
1455 rc
= selinux_proc_get_sid(table
->de
, (op
== 001) ?
1456 SECCLASS_DIR
: SECCLASS_FILE
, &tsid
);
1458 /* Default to the well-defined sysctl SID. */
1459 tsid
= SECINITSID_SYSCTL
;
1462 /* The op values are "defined" in sysctl.c, thereby creating
1463 * a bad coupling between this module and sysctl.c */
1465 error
= avc_has_perm(tsec
->sid
, tsid
,
1466 SECCLASS_DIR
, DIR__SEARCH
, NULL
);
1474 error
= avc_has_perm(tsec
->sid
, tsid
,
1475 SECCLASS_FILE
, av
, NULL
);
1481 static int selinux_quotactl(int cmds
, int type
, int id
, struct super_block
*sb
)
1494 rc
= superblock_has_perm(current
,
1496 FILESYSTEM__QUOTAMOD
, NULL
);
1501 rc
= superblock_has_perm(current
,
1503 FILESYSTEM__QUOTAGET
, NULL
);
1506 rc
= 0; /* let the kernel handle invalid cmds */
1512 static int selinux_quota_on(struct dentry
*dentry
)
1514 return dentry_has_perm(current
, NULL
, dentry
, FILE__QUOTAON
);
1517 static int selinux_syslog(int type
)
1521 rc
= secondary_ops
->syslog(type
);
1526 case 3: /* Read last kernel messages */
1527 case 10: /* Return size of the log buffer */
1528 rc
= task_has_system(current
, SYSTEM__SYSLOG_READ
);
1530 case 6: /* Disable logging to console */
1531 case 7: /* Enable logging to console */
1532 case 8: /* Set level of messages printed to console */
1533 rc
= task_has_system(current
, SYSTEM__SYSLOG_CONSOLE
);
1535 case 0: /* Close log */
1536 case 1: /* Open log */
1537 case 2: /* Read from log */
1538 case 4: /* Read/clear last kernel messages */
1539 case 5: /* Clear ring buffer */
1541 rc
= task_has_system(current
, SYSTEM__SYSLOG_MOD
);
1548 * Check that a process has enough memory to allocate a new virtual
1549 * mapping. 0 means there is enough memory for the allocation to
1550 * succeed and -ENOMEM implies there is not.
1552 * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1553 * if the capability is granted, but __vm_enough_memory requires 1 if
1554 * the capability is granted.
1556 * Do not audit the selinux permission check, as this is applied to all
1557 * processes that allocate mappings.
1559 static int selinux_vm_enough_memory(long pages
)
1561 int rc
, cap_sys_admin
= 0;
1562 struct task_security_struct
*tsec
= current
->security
;
1564 rc
= secondary_ops
->capable(current
, CAP_SYS_ADMIN
);
1566 rc
= avc_has_perm_noaudit(tsec
->sid
, tsec
->sid
,
1567 SECCLASS_CAPABILITY
,
1568 CAP_TO_MASK(CAP_SYS_ADMIN
),
1574 return __vm_enough_memory(pages
, cap_sys_admin
);
1577 /* binprm security operations */
1579 static int selinux_bprm_alloc_security(struct linux_binprm
*bprm
)
1581 struct bprm_security_struct
*bsec
;
1583 bsec
= kzalloc(sizeof(struct bprm_security_struct
), GFP_KERNEL
);
1588 bsec
->sid
= SECINITSID_UNLABELED
;
1591 bprm
->security
= bsec
;
1595 static int selinux_bprm_set_security(struct linux_binprm
*bprm
)
1597 struct task_security_struct
*tsec
;
1598 struct inode
*inode
= bprm
->file
->f_dentry
->d_inode
;
1599 struct inode_security_struct
*isec
;
1600 struct bprm_security_struct
*bsec
;
1602 struct avc_audit_data ad
;
1605 rc
= secondary_ops
->bprm_set_security(bprm
);
1609 bsec
= bprm
->security
;
1614 tsec
= current
->security
;
1615 isec
= inode
->i_security
;
1617 /* Default to the current task SID. */
1618 bsec
->sid
= tsec
->sid
;
1620 /* Reset fs, key, and sock SIDs on execve. */
1621 tsec
->create_sid
= 0;
1622 tsec
->keycreate_sid
= 0;
1623 tsec
->sockcreate_sid
= 0;
1625 if (tsec
->exec_sid
) {
1626 newsid
= tsec
->exec_sid
;
1627 /* Reset exec SID on execve. */
1630 /* Check for a default transition on this program. */
1631 rc
= security_transition_sid(tsec
->sid
, isec
->sid
,
1632 SECCLASS_PROCESS
, &newsid
);
1637 AVC_AUDIT_DATA_INIT(&ad
, FS
);
1638 ad
.u
.fs
.mnt
= bprm
->file
->f_vfsmnt
;
1639 ad
.u
.fs
.dentry
= bprm
->file
->f_dentry
;
1641 if (bprm
->file
->f_vfsmnt
->mnt_flags
& MNT_NOSUID
)
1644 if (tsec
->sid
== newsid
) {
1645 rc
= avc_has_perm(tsec
->sid
, isec
->sid
,
1646 SECCLASS_FILE
, FILE__EXECUTE_NO_TRANS
, &ad
);
1650 /* Check permissions for the transition. */
1651 rc
= avc_has_perm(tsec
->sid
, newsid
,
1652 SECCLASS_PROCESS
, PROCESS__TRANSITION
, &ad
);
1656 rc
= avc_has_perm(newsid
, isec
->sid
,
1657 SECCLASS_FILE
, FILE__ENTRYPOINT
, &ad
);
1661 /* Clear any possibly unsafe personality bits on exec: */
1662 current
->personality
&= ~PER_CLEAR_ON_SETID
;
1664 /* Set the security field to the new SID. */
1672 static int selinux_bprm_check_security (struct linux_binprm
*bprm
)
1674 return secondary_ops
->bprm_check_security(bprm
);
1678 static int selinux_bprm_secureexec (struct linux_binprm
*bprm
)
1680 struct task_security_struct
*tsec
= current
->security
;
1683 if (tsec
->osid
!= tsec
->sid
) {
1684 /* Enable secure mode for SIDs transitions unless
1685 the noatsecure permission is granted between
1686 the two SIDs, i.e. ahp returns 0. */
1687 atsecure
= avc_has_perm(tsec
->osid
, tsec
->sid
,
1689 PROCESS__NOATSECURE
, NULL
);
1692 return (atsecure
|| secondary_ops
->bprm_secureexec(bprm
));
1695 static void selinux_bprm_free_security(struct linux_binprm
*bprm
)
1697 kfree(bprm
->security
);
1698 bprm
->security
= NULL
;
1701 extern struct vfsmount
*selinuxfs_mount
;
1702 extern struct dentry
*selinux_null
;
1704 /* Derived from fs/exec.c:flush_old_files. */
1705 static inline void flush_unauthorized_files(struct files_struct
* files
)
1707 struct avc_audit_data ad
;
1708 struct file
*file
, *devnull
= NULL
;
1709 struct tty_struct
*tty
= current
->signal
->tty
;
1710 struct fdtable
*fdt
;
1715 file
= list_entry(tty
->tty_files
.next
, typeof(*file
), f_u
.fu_list
);
1717 /* Revalidate access to controlling tty.
1718 Use inode_has_perm on the tty inode directly rather
1719 than using file_has_perm, as this particular open
1720 file may belong to another process and we are only
1721 interested in the inode-based check here. */
1722 struct inode
*inode
= file
->f_dentry
->d_inode
;
1723 if (inode_has_perm(current
, inode
,
1724 FILE__READ
| FILE__WRITE
, NULL
)) {
1725 /* Reset controlling tty. */
1726 current
->signal
->tty
= NULL
;
1727 current
->signal
->tty_old_pgrp
= 0;
1733 /* Revalidate access to inherited open files. */
1735 AVC_AUDIT_DATA_INIT(&ad
,FS
);
1737 spin_lock(&files
->file_lock
);
1739 unsigned long set
, i
;
1744 fdt
= files_fdtable(files
);
1745 if (i
>= fdt
->max_fds
|| i
>= fdt
->max_fdset
)
1747 set
= fdt
->open_fds
->fds_bits
[j
];
1750 spin_unlock(&files
->file_lock
);
1751 for ( ; set
; i
++,set
>>= 1) {
1756 if (file_has_perm(current
,
1758 file_to_av(file
))) {
1760 fd
= get_unused_fd();
1770 devnull
= dentry_open(dget(selinux_null
), mntget(selinuxfs_mount
), O_RDWR
);
1777 fd_install(fd
, devnull
);
1782 spin_lock(&files
->file_lock
);
1785 spin_unlock(&files
->file_lock
);
1788 static void selinux_bprm_apply_creds(struct linux_binprm
*bprm
, int unsafe
)
1790 struct task_security_struct
*tsec
;
1791 struct bprm_security_struct
*bsec
;
1795 secondary_ops
->bprm_apply_creds(bprm
, unsafe
);
1797 tsec
= current
->security
;
1799 bsec
= bprm
->security
;
1802 tsec
->osid
= tsec
->sid
;
1804 if (tsec
->sid
!= sid
) {
1805 /* Check for shared state. If not ok, leave SID
1806 unchanged and kill. */
1807 if (unsafe
& LSM_UNSAFE_SHARE
) {
1808 rc
= avc_has_perm(tsec
->sid
, sid
, SECCLASS_PROCESS
,
1809 PROCESS__SHARE
, NULL
);
1816 /* Check for ptracing, and update the task SID if ok.
1817 Otherwise, leave SID unchanged and kill. */
1818 if (unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
1819 rc
= avc_has_perm(tsec
->ptrace_sid
, sid
,
1820 SECCLASS_PROCESS
, PROCESS__PTRACE
,
1832 * called after apply_creds without the task lock held
1834 static void selinux_bprm_post_apply_creds(struct linux_binprm
*bprm
)
1836 struct task_security_struct
*tsec
;
1837 struct rlimit
*rlim
, *initrlim
;
1838 struct itimerval itimer
;
1839 struct bprm_security_struct
*bsec
;
1842 tsec
= current
->security
;
1843 bsec
= bprm
->security
;
1846 force_sig_specific(SIGKILL
, current
);
1849 if (tsec
->osid
== tsec
->sid
)
1852 /* Close files for which the new task SID is not authorized. */
1853 flush_unauthorized_files(current
->files
);
1855 /* Check whether the new SID can inherit signal state
1856 from the old SID. If not, clear itimers to avoid
1857 subsequent signal generation and flush and unblock
1858 signals. This must occur _after_ the task SID has
1859 been updated so that any kill done after the flush
1860 will be checked against the new SID. */
1861 rc
= avc_has_perm(tsec
->osid
, tsec
->sid
, SECCLASS_PROCESS
,
1862 PROCESS__SIGINH
, NULL
);
1864 memset(&itimer
, 0, sizeof itimer
);
1865 for (i
= 0; i
< 3; i
++)
1866 do_setitimer(i
, &itimer
, NULL
);
1867 flush_signals(current
);
1868 spin_lock_irq(¤t
->sighand
->siglock
);
1869 flush_signal_handlers(current
, 1);
1870 sigemptyset(¤t
->blocked
);
1871 recalc_sigpending();
1872 spin_unlock_irq(¤t
->sighand
->siglock
);
1875 /* Check whether the new SID can inherit resource limits
1876 from the old SID. If not, reset all soft limits to
1877 the lower of the current task's hard limit and the init
1878 task's soft limit. Note that the setting of hard limits
1879 (even to lower them) can be controlled by the setrlimit
1880 check. The inclusion of the init task's soft limit into
1881 the computation is to avoid resetting soft limits higher
1882 than the default soft limit for cases where the default
1883 is lower than the hard limit, e.g. RLIMIT_CORE or
1885 rc
= avc_has_perm(tsec
->osid
, tsec
->sid
, SECCLASS_PROCESS
,
1886 PROCESS__RLIMITINH
, NULL
);
1888 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
1889 rlim
= current
->signal
->rlim
+ i
;
1890 initrlim
= init_task
.signal
->rlim
+i
;
1891 rlim
->rlim_cur
= min(rlim
->rlim_max
,initrlim
->rlim_cur
);
1893 if (current
->signal
->rlim
[RLIMIT_CPU
].rlim_cur
!= RLIM_INFINITY
) {
1895 * This will cause RLIMIT_CPU calculations
1898 current
->it_prof_expires
= jiffies_to_cputime(1);
1902 /* Wake up the parent if it is waiting so that it can
1903 recheck wait permission to the new task SID. */
1904 wake_up_interruptible(¤t
->parent
->signal
->wait_chldexit
);
1907 /* superblock security operations */
1909 static int selinux_sb_alloc_security(struct super_block
*sb
)
1911 return superblock_alloc_security(sb
);
1914 static void selinux_sb_free_security(struct super_block
*sb
)
1916 superblock_free_security(sb
);
1919 static inline int match_prefix(char *prefix
, int plen
, char *option
, int olen
)
1924 return !memcmp(prefix
, option
, plen
);
1927 static inline int selinux_option(char *option
, int len
)
1929 return (match_prefix("context=", sizeof("context=")-1, option
, len
) ||
1930 match_prefix("fscontext=", sizeof("fscontext=")-1, option
, len
) ||
1931 match_prefix("defcontext=", sizeof("defcontext=")-1, option
, len
) ||
1932 match_prefix("rootcontext=", sizeof("rootcontext=")-1, option
, len
));
1935 static inline void take_option(char **to
, char *from
, int *first
, int len
)
1943 memcpy(*to
, from
, len
);
1947 static int selinux_sb_copy_data(struct file_system_type
*type
, void *orig
, void *copy
)
1949 int fnosec
, fsec
, rc
= 0;
1950 char *in_save
, *in_curr
, *in_end
;
1951 char *sec_curr
, *nosec_save
, *nosec
;
1956 /* Binary mount data: just copy */
1957 if (type
->fs_flags
& FS_BINARY_MOUNTDATA
) {
1958 copy_page(sec_curr
, in_curr
);
1962 nosec
= (char *)get_zeroed_page(GFP_KERNEL
);
1970 in_save
= in_end
= orig
;
1973 if (*in_end
== ',' || *in_end
== '\0') {
1974 int len
= in_end
- in_curr
;
1976 if (selinux_option(in_curr
, len
))
1977 take_option(&sec_curr
, in_curr
, &fsec
, len
);
1979 take_option(&nosec
, in_curr
, &fnosec
, len
);
1981 in_curr
= in_end
+ 1;
1983 } while (*in_end
++);
1985 strcpy(in_save
, nosec_save
);
1986 free_page((unsigned long)nosec_save
);
1991 static int selinux_sb_kern_mount(struct super_block
*sb
, void *data
)
1993 struct avc_audit_data ad
;
1996 rc
= superblock_doinit(sb
, data
);
2000 AVC_AUDIT_DATA_INIT(&ad
,FS
);
2001 ad
.u
.fs
.dentry
= sb
->s_root
;
2002 return superblock_has_perm(current
, sb
, FILESYSTEM__MOUNT
, &ad
);
2005 static int selinux_sb_statfs(struct dentry
*dentry
)
2007 struct avc_audit_data ad
;
2009 AVC_AUDIT_DATA_INIT(&ad
,FS
);
2010 ad
.u
.fs
.dentry
= dentry
->d_sb
->s_root
;
2011 return superblock_has_perm(current
, dentry
->d_sb
, FILESYSTEM__GETATTR
, &ad
);
2014 static int selinux_mount(char * dev_name
,
2015 struct nameidata
*nd
,
2017 unsigned long flags
,
2022 rc
= secondary_ops
->sb_mount(dev_name
, nd
, type
, flags
, data
);
2026 if (flags
& MS_REMOUNT
)
2027 return superblock_has_perm(current
, nd
->mnt
->mnt_sb
,
2028 FILESYSTEM__REMOUNT
, NULL
);
2030 return dentry_has_perm(current
, nd
->mnt
, nd
->dentry
,
2034 static int selinux_umount(struct vfsmount
*mnt
, int flags
)
2038 rc
= secondary_ops
->sb_umount(mnt
, flags
);
2042 return superblock_has_perm(current
,mnt
->mnt_sb
,
2043 FILESYSTEM__UNMOUNT
,NULL
);
2046 /* inode security operations */
2048 static int selinux_inode_alloc_security(struct inode
*inode
)
2050 return inode_alloc_security(inode
);
2053 static void selinux_inode_free_security(struct inode
*inode
)
2055 inode_free_security(inode
);
2058 static int selinux_inode_init_security(struct inode
*inode
, struct inode
*dir
,
2059 char **name
, void **value
,
2062 struct task_security_struct
*tsec
;
2063 struct inode_security_struct
*dsec
;
2064 struct superblock_security_struct
*sbsec
;
2067 char *namep
= NULL
, *context
;
2069 tsec
= current
->security
;
2070 dsec
= dir
->i_security
;
2071 sbsec
= dir
->i_sb
->s_security
;
2073 if (tsec
->create_sid
&& sbsec
->behavior
!= SECURITY_FS_USE_MNTPOINT
) {
2074 newsid
= tsec
->create_sid
;
2076 rc
= security_transition_sid(tsec
->sid
, dsec
->sid
,
2077 inode_mode_to_security_class(inode
->i_mode
),
2080 printk(KERN_WARNING
"%s: "
2081 "security_transition_sid failed, rc=%d (dev=%s "
2084 -rc
, inode
->i_sb
->s_id
, inode
->i_ino
);
2089 inode_security_set_sid(inode
, newsid
);
2091 if (!ss_initialized
|| sbsec
->behavior
== SECURITY_FS_USE_MNTPOINT
)
2095 namep
= kstrdup(XATTR_SELINUX_SUFFIX
, GFP_KERNEL
);
2102 rc
= security_sid_to_context(newsid
, &context
, &clen
);
2114 static int selinux_inode_create(struct inode
*dir
, struct dentry
*dentry
, int mask
)
2116 return may_create(dir
, dentry
, SECCLASS_FILE
);
2119 static int selinux_inode_link(struct dentry
*old_dentry
, struct inode
*dir
, struct dentry
*new_dentry
)
2123 rc
= secondary_ops
->inode_link(old_dentry
,dir
,new_dentry
);
2126 return may_link(dir
, old_dentry
, MAY_LINK
);
2129 static int selinux_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
2133 rc
= secondary_ops
->inode_unlink(dir
, dentry
);
2136 return may_link(dir
, dentry
, MAY_UNLINK
);
2139 static int selinux_inode_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *name
)
2141 return may_create(dir
, dentry
, SECCLASS_LNK_FILE
);
2144 static int selinux_inode_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mask
)
2146 return may_create(dir
, dentry
, SECCLASS_DIR
);
2149 static int selinux_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2151 return may_link(dir
, dentry
, MAY_RMDIR
);
2154 static int selinux_inode_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t dev
)
2158 rc
= secondary_ops
->inode_mknod(dir
, dentry
, mode
, dev
);
2162 return may_create(dir
, dentry
, inode_mode_to_security_class(mode
));
2165 static int selinux_inode_rename(struct inode
*old_inode
, struct dentry
*old_dentry
,
2166 struct inode
*new_inode
, struct dentry
*new_dentry
)
2168 return may_rename(old_inode
, old_dentry
, new_inode
, new_dentry
);
2171 static int selinux_inode_readlink(struct dentry
*dentry
)
2173 return dentry_has_perm(current
, NULL
, dentry
, FILE__READ
);
2176 static int selinux_inode_follow_link(struct dentry
*dentry
, struct nameidata
*nameidata
)
2180 rc
= secondary_ops
->inode_follow_link(dentry
,nameidata
);
2183 return dentry_has_perm(current
, NULL
, dentry
, FILE__READ
);
2186 static int selinux_inode_permission(struct inode
*inode
, int mask
,
2187 struct nameidata
*nd
)
2191 rc
= secondary_ops
->inode_permission(inode
, mask
, nd
);
2196 /* No permission to check. Existence test. */
2200 return inode_has_perm(current
, inode
,
2201 file_mask_to_av(inode
->i_mode
, mask
), NULL
);
2204 static int selinux_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
2208 rc
= secondary_ops
->inode_setattr(dentry
, iattr
);
2212 if (iattr
->ia_valid
& ATTR_FORCE
)
2215 if (iattr
->ia_valid
& (ATTR_MODE
| ATTR_UID
| ATTR_GID
|
2216 ATTR_ATIME_SET
| ATTR_MTIME_SET
))
2217 return dentry_has_perm(current
, NULL
, dentry
, FILE__SETATTR
);
2219 return dentry_has_perm(current
, NULL
, dentry
, FILE__WRITE
);
2222 static int selinux_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
2224 return dentry_has_perm(current
, mnt
, dentry
, FILE__GETATTR
);
2227 static int selinux_inode_setxattr(struct dentry
*dentry
, char *name
, void *value
, size_t size
, int flags
)
2229 struct task_security_struct
*tsec
= current
->security
;
2230 struct inode
*inode
= dentry
->d_inode
;
2231 struct inode_security_struct
*isec
= inode
->i_security
;
2232 struct superblock_security_struct
*sbsec
;
2233 struct avc_audit_data ad
;
2237 if (strcmp(name
, XATTR_NAME_SELINUX
)) {
2238 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
2239 sizeof XATTR_SECURITY_PREFIX
- 1) &&
2240 !capable(CAP_SYS_ADMIN
)) {
2241 /* A different attribute in the security namespace.
2242 Restrict to administrator. */
2246 /* Not an attribute we recognize, so just check the
2247 ordinary setattr permission. */
2248 return dentry_has_perm(current
, NULL
, dentry
, FILE__SETATTR
);
2251 sbsec
= inode
->i_sb
->s_security
;
2252 if (sbsec
->behavior
== SECURITY_FS_USE_MNTPOINT
)
2255 if ((current
->fsuid
!= inode
->i_uid
) && !capable(CAP_FOWNER
))
2258 AVC_AUDIT_DATA_INIT(&ad
,FS
);
2259 ad
.u
.fs
.dentry
= dentry
;
2261 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, isec
->sclass
,
2262 FILE__RELABELFROM
, &ad
);
2266 rc
= security_context_to_sid(value
, size
, &newsid
);
2270 rc
= avc_has_perm(tsec
->sid
, newsid
, isec
->sclass
,
2271 FILE__RELABELTO
, &ad
);
2275 rc
= security_validate_transition(isec
->sid
, newsid
, tsec
->sid
,
2280 return avc_has_perm(newsid
,
2282 SECCLASS_FILESYSTEM
,
2283 FILESYSTEM__ASSOCIATE
,
2287 static void selinux_inode_post_setxattr(struct dentry
*dentry
, char *name
,
2288 void *value
, size_t size
, int flags
)
2290 struct inode
*inode
= dentry
->d_inode
;
2291 struct inode_security_struct
*isec
= inode
->i_security
;
2295 if (strcmp(name
, XATTR_NAME_SELINUX
)) {
2296 /* Not an attribute we recognize, so nothing to do. */
2300 rc
= security_context_to_sid(value
, size
, &newsid
);
2302 printk(KERN_WARNING
"%s: unable to obtain SID for context "
2303 "%s, rc=%d\n", __FUNCTION__
, (char*)value
, -rc
);
2311 static int selinux_inode_getxattr (struct dentry
*dentry
, char *name
)
2313 return dentry_has_perm(current
, NULL
, dentry
, FILE__GETATTR
);
2316 static int selinux_inode_listxattr (struct dentry
*dentry
)
2318 return dentry_has_perm(current
, NULL
, dentry
, FILE__GETATTR
);
2321 static int selinux_inode_removexattr (struct dentry
*dentry
, char *name
)
2323 if (strcmp(name
, XATTR_NAME_SELINUX
)) {
2324 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
2325 sizeof XATTR_SECURITY_PREFIX
- 1) &&
2326 !capable(CAP_SYS_ADMIN
)) {
2327 /* A different attribute in the security namespace.
2328 Restrict to administrator. */
2332 /* Not an attribute we recognize, so just check the
2333 ordinary setattr permission. Might want a separate
2334 permission for removexattr. */
2335 return dentry_has_perm(current
, NULL
, dentry
, FILE__SETATTR
);
2338 /* No one is allowed to remove a SELinux security label.
2339 You can change the label, but all data must be labeled. */
2343 static const char *selinux_inode_xattr_getsuffix(void)
2345 return XATTR_SELINUX_SUFFIX
;
2349 * Copy the in-core inode security context value to the user. If the
2350 * getxattr() prior to this succeeded, check to see if we need to
2351 * canonicalize the value to be finally returned to the user.
2353 * Permission check is handled by selinux_inode_getxattr hook.
2355 static int selinux_inode_getsecurity(const struct inode
*inode
, const char *name
, void *buffer
, size_t size
, int err
)
2357 struct inode_security_struct
*isec
= inode
->i_security
;
2359 if (strcmp(name
, XATTR_SELINUX_SUFFIX
))
2362 return selinux_getsecurity(isec
->sid
, buffer
, size
);
2365 static int selinux_inode_setsecurity(struct inode
*inode
, const char *name
,
2366 const void *value
, size_t size
, int flags
)
2368 struct inode_security_struct
*isec
= inode
->i_security
;
2372 if (strcmp(name
, XATTR_SELINUX_SUFFIX
))
2375 if (!value
|| !size
)
2378 rc
= security_context_to_sid((void*)value
, size
, &newsid
);
2386 static int selinux_inode_listsecurity(struct inode
*inode
, char *buffer
, size_t buffer_size
)
2388 const int len
= sizeof(XATTR_NAME_SELINUX
);
2389 if (buffer
&& len
<= buffer_size
)
2390 memcpy(buffer
, XATTR_NAME_SELINUX
, len
);
2394 /* file security operations */
2396 static int selinux_file_permission(struct file
*file
, int mask
)
2398 struct inode
*inode
= file
->f_dentry
->d_inode
;
2401 /* No permission to check. Existence test. */
2405 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2406 if ((file
->f_flags
& O_APPEND
) && (mask
& MAY_WRITE
))
2409 return file_has_perm(current
, file
,
2410 file_mask_to_av(inode
->i_mode
, mask
));
2413 static int selinux_file_alloc_security(struct file
*file
)
2415 return file_alloc_security(file
);
2418 static void selinux_file_free_security(struct file
*file
)
2420 file_free_security(file
);
2423 static int selinux_file_ioctl(struct file
*file
, unsigned int cmd
,
2435 case EXT2_IOC_GETFLAGS
:
2437 case EXT2_IOC_GETVERSION
:
2438 error
= file_has_perm(current
, file
, FILE__GETATTR
);
2441 case EXT2_IOC_SETFLAGS
:
2443 case EXT2_IOC_SETVERSION
:
2444 error
= file_has_perm(current
, file
, FILE__SETATTR
);
2447 /* sys_ioctl() checks */
2451 error
= file_has_perm(current
, file
, 0);
2456 error
= task_has_capability(current
,CAP_SYS_TTY_CONFIG
);
2459 /* default case assumes that the command will go
2460 * to the file's ioctl() function.
2463 error
= file_has_perm(current
, file
, FILE__IOCTL
);
2469 static int file_map_prot_check(struct file
*file
, unsigned long prot
, int shared
)
2471 #ifndef CONFIG_PPC32
2472 if ((prot
& PROT_EXEC
) && (!file
|| (!shared
&& (prot
& PROT_WRITE
)))) {
2474 * We are making executable an anonymous mapping or a
2475 * private file mapping that will also be writable.
2476 * This has an additional check.
2478 int rc
= task_has_perm(current
, current
, PROCESS__EXECMEM
);
2485 /* read access is always possible with a mapping */
2486 u32 av
= FILE__READ
;
2488 /* write access only matters if the mapping is shared */
2489 if (shared
&& (prot
& PROT_WRITE
))
2492 if (prot
& PROT_EXEC
)
2493 av
|= FILE__EXECUTE
;
2495 return file_has_perm(current
, file
, av
);
2500 static int selinux_file_mmap(struct file
*file
, unsigned long reqprot
,
2501 unsigned long prot
, unsigned long flags
)
2505 rc
= secondary_ops
->file_mmap(file
, reqprot
, prot
, flags
);
2509 if (selinux_checkreqprot
)
2512 return file_map_prot_check(file
, prot
,
2513 (flags
& MAP_TYPE
) == MAP_SHARED
);
2516 static int selinux_file_mprotect(struct vm_area_struct
*vma
,
2517 unsigned long reqprot
,
2522 rc
= secondary_ops
->file_mprotect(vma
, reqprot
, prot
);
2526 if (selinux_checkreqprot
)
2529 #ifndef CONFIG_PPC32
2530 if ((prot
& PROT_EXEC
) && !(vma
->vm_flags
& VM_EXEC
)) {
2532 if (vma
->vm_start
>= vma
->vm_mm
->start_brk
&&
2533 vma
->vm_end
<= vma
->vm_mm
->brk
) {
2534 rc
= task_has_perm(current
, current
,
2536 } else if (!vma
->vm_file
&&
2537 vma
->vm_start
<= vma
->vm_mm
->start_stack
&&
2538 vma
->vm_end
>= vma
->vm_mm
->start_stack
) {
2539 rc
= task_has_perm(current
, current
, PROCESS__EXECSTACK
);
2540 } else if (vma
->vm_file
&& vma
->anon_vma
) {
2542 * We are making executable a file mapping that has
2543 * had some COW done. Since pages might have been
2544 * written, check ability to execute the possibly
2545 * modified content. This typically should only
2546 * occur for text relocations.
2548 rc
= file_has_perm(current
, vma
->vm_file
,
2556 return file_map_prot_check(vma
->vm_file
, prot
, vma
->vm_flags
&VM_SHARED
);
2559 static int selinux_file_lock(struct file
*file
, unsigned int cmd
)
2561 return file_has_perm(current
, file
, FILE__LOCK
);
2564 static int selinux_file_fcntl(struct file
*file
, unsigned int cmd
,
2571 if (!file
->f_dentry
|| !file
->f_dentry
->d_inode
) {
2576 if ((file
->f_flags
& O_APPEND
) && !(arg
& O_APPEND
)) {
2577 err
= file_has_perm(current
, file
,FILE__WRITE
);
2586 /* Just check FD__USE permission */
2587 err
= file_has_perm(current
, file
, 0);
2592 #if BITS_PER_LONG == 32
2597 if (!file
->f_dentry
|| !file
->f_dentry
->d_inode
) {
2601 err
= file_has_perm(current
, file
, FILE__LOCK
);
2608 static int selinux_file_set_fowner(struct file
*file
)
2610 struct task_security_struct
*tsec
;
2611 struct file_security_struct
*fsec
;
2613 tsec
= current
->security
;
2614 fsec
= file
->f_security
;
2615 fsec
->fown_sid
= tsec
->sid
;
2620 static int selinux_file_send_sigiotask(struct task_struct
*tsk
,
2621 struct fown_struct
*fown
, int signum
)
2625 struct task_security_struct
*tsec
;
2626 struct file_security_struct
*fsec
;
2628 /* struct fown_struct is never outside the context of a struct file */
2629 file
= (struct file
*)((long)fown
- offsetof(struct file
,f_owner
));
2631 tsec
= tsk
->security
;
2632 fsec
= file
->f_security
;
2635 perm
= signal_to_av(SIGIO
); /* as per send_sigio_to_task */
2637 perm
= signal_to_av(signum
);
2639 return avc_has_perm(fsec
->fown_sid
, tsec
->sid
,
2640 SECCLASS_PROCESS
, perm
, NULL
);
2643 static int selinux_file_receive(struct file
*file
)
2645 return file_has_perm(current
, file
, file_to_av(file
));
2648 /* task security operations */
2650 static int selinux_task_create(unsigned long clone_flags
)
2654 rc
= secondary_ops
->task_create(clone_flags
);
2658 return task_has_perm(current
, current
, PROCESS__FORK
);
2661 static int selinux_task_alloc_security(struct task_struct
*tsk
)
2663 struct task_security_struct
*tsec1
, *tsec2
;
2666 tsec1
= current
->security
;
2668 rc
= task_alloc_security(tsk
);
2671 tsec2
= tsk
->security
;
2673 tsec2
->osid
= tsec1
->osid
;
2674 tsec2
->sid
= tsec1
->sid
;
2676 /* Retain the exec, fs, key, and sock SIDs across fork */
2677 tsec2
->exec_sid
= tsec1
->exec_sid
;
2678 tsec2
->create_sid
= tsec1
->create_sid
;
2679 tsec2
->keycreate_sid
= tsec1
->keycreate_sid
;
2680 tsec2
->sockcreate_sid
= tsec1
->sockcreate_sid
;
2682 /* Retain ptracer SID across fork, if any.
2683 This will be reset by the ptrace hook upon any
2684 subsequent ptrace_attach operations. */
2685 tsec2
->ptrace_sid
= tsec1
->ptrace_sid
;
2690 static void selinux_task_free_security(struct task_struct
*tsk
)
2692 task_free_security(tsk
);
2695 static int selinux_task_setuid(uid_t id0
, uid_t id1
, uid_t id2
, int flags
)
2697 /* Since setuid only affects the current process, and
2698 since the SELinux controls are not based on the Linux
2699 identity attributes, SELinux does not need to control
2700 this operation. However, SELinux does control the use
2701 of the CAP_SETUID and CAP_SETGID capabilities using the
2706 static int selinux_task_post_setuid(uid_t id0
, uid_t id1
, uid_t id2
, int flags
)
2708 return secondary_ops
->task_post_setuid(id0
,id1
,id2
,flags
);
2711 static int selinux_task_setgid(gid_t id0
, gid_t id1
, gid_t id2
, int flags
)
2713 /* See the comment for setuid above. */
2717 static int selinux_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2719 return task_has_perm(current
, p
, PROCESS__SETPGID
);
2722 static int selinux_task_getpgid(struct task_struct
*p
)
2724 return task_has_perm(current
, p
, PROCESS__GETPGID
);
2727 static int selinux_task_getsid(struct task_struct
*p
)
2729 return task_has_perm(current
, p
, PROCESS__GETSESSION
);
2732 static void selinux_task_getsecid(struct task_struct
*p
, u32
*secid
)
2734 selinux_get_task_sid(p
, secid
);
2737 static int selinux_task_setgroups(struct group_info
*group_info
)
2739 /* See the comment for setuid above. */
2743 static int selinux_task_setnice(struct task_struct
*p
, int nice
)
2747 rc
= secondary_ops
->task_setnice(p
, nice
);
2751 return task_has_perm(current
,p
, PROCESS__SETSCHED
);
2754 static int selinux_task_setioprio(struct task_struct
*p
, int ioprio
)
2756 return task_has_perm(current
, p
, PROCESS__SETSCHED
);
2759 static int selinux_task_getioprio(struct task_struct
*p
)
2761 return task_has_perm(current
, p
, PROCESS__GETSCHED
);
2764 static int selinux_task_setrlimit(unsigned int resource
, struct rlimit
*new_rlim
)
2766 struct rlimit
*old_rlim
= current
->signal
->rlim
+ resource
;
2769 rc
= secondary_ops
->task_setrlimit(resource
, new_rlim
);
2773 /* Control the ability to change the hard limit (whether
2774 lowering or raising it), so that the hard limit can
2775 later be used as a safe reset point for the soft limit
2776 upon context transitions. See selinux_bprm_apply_creds. */
2777 if (old_rlim
->rlim_max
!= new_rlim
->rlim_max
)
2778 return task_has_perm(current
, current
, PROCESS__SETRLIMIT
);
2783 static int selinux_task_setscheduler(struct task_struct
*p
, int policy
, struct sched_param
*lp
)
2785 return task_has_perm(current
, p
, PROCESS__SETSCHED
);
2788 static int selinux_task_getscheduler(struct task_struct
*p
)
2790 return task_has_perm(current
, p
, PROCESS__GETSCHED
);
2793 static int selinux_task_movememory(struct task_struct
*p
)
2795 return task_has_perm(current
, p
, PROCESS__SETSCHED
);
2798 static int selinux_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2803 struct task_security_struct
*tsec
;
2805 rc
= secondary_ops
->task_kill(p
, info
, sig
, secid
);
2809 if (info
!= SEND_SIG_NOINFO
&& (is_si_special(info
) || SI_FROMKERNEL(info
)))
2813 perm
= PROCESS__SIGNULL
; /* null signal; existence test */
2815 perm
= signal_to_av(sig
);
2818 rc
= avc_has_perm(secid
, tsec
->sid
, SECCLASS_PROCESS
, perm
, NULL
);
2820 rc
= task_has_perm(current
, p
, perm
);
2824 static int selinux_task_prctl(int option
,
2830 /* The current prctl operations do not appear to require
2831 any SELinux controls since they merely observe or modify
2832 the state of the current process. */
2836 static int selinux_task_wait(struct task_struct
*p
)
2840 perm
= signal_to_av(p
->exit_signal
);
2842 return task_has_perm(p
, current
, perm
);
2845 static void selinux_task_reparent_to_init(struct task_struct
*p
)
2847 struct task_security_struct
*tsec
;
2849 secondary_ops
->task_reparent_to_init(p
);
2852 tsec
->osid
= tsec
->sid
;
2853 tsec
->sid
= SECINITSID_KERNEL
;
2857 static void selinux_task_to_inode(struct task_struct
*p
,
2858 struct inode
*inode
)
2860 struct task_security_struct
*tsec
= p
->security
;
2861 struct inode_security_struct
*isec
= inode
->i_security
;
2863 isec
->sid
= tsec
->sid
;
2864 isec
->initialized
= 1;
2868 /* Returns error only if unable to parse addresses */
2869 static int selinux_parse_skb_ipv4(struct sk_buff
*skb
, struct avc_audit_data
*ad
)
2871 int offset
, ihlen
, ret
= -EINVAL
;
2872 struct iphdr _iph
, *ih
;
2874 offset
= skb
->nh
.raw
- skb
->data
;
2875 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
2879 ihlen
= ih
->ihl
* 4;
2880 if (ihlen
< sizeof(_iph
))
2883 ad
->u
.net
.v4info
.saddr
= ih
->saddr
;
2884 ad
->u
.net
.v4info
.daddr
= ih
->daddr
;
2887 switch (ih
->protocol
) {
2889 struct tcphdr _tcph
, *th
;
2891 if (ntohs(ih
->frag_off
) & IP_OFFSET
)
2895 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
2899 ad
->u
.net
.sport
= th
->source
;
2900 ad
->u
.net
.dport
= th
->dest
;
2905 struct udphdr _udph
, *uh
;
2907 if (ntohs(ih
->frag_off
) & IP_OFFSET
)
2911 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
2915 ad
->u
.net
.sport
= uh
->source
;
2916 ad
->u
.net
.dport
= uh
->dest
;
2927 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2929 /* Returns error only if unable to parse addresses */
2930 static int selinux_parse_skb_ipv6(struct sk_buff
*skb
, struct avc_audit_data
*ad
)
2933 int ret
= -EINVAL
, offset
;
2934 struct ipv6hdr _ipv6h
, *ip6
;
2936 offset
= skb
->nh
.raw
- skb
->data
;
2937 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
2941 ipv6_addr_copy(&ad
->u
.net
.v6info
.saddr
, &ip6
->saddr
);
2942 ipv6_addr_copy(&ad
->u
.net
.v6info
.daddr
, &ip6
->daddr
);
2945 nexthdr
= ip6
->nexthdr
;
2946 offset
+= sizeof(_ipv6h
);
2947 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
);
2953 struct tcphdr _tcph
, *th
;
2955 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
2959 ad
->u
.net
.sport
= th
->source
;
2960 ad
->u
.net
.dport
= th
->dest
;
2965 struct udphdr _udph
, *uh
;
2967 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
2971 ad
->u
.net
.sport
= uh
->source
;
2972 ad
->u
.net
.dport
= uh
->dest
;
2976 /* includes fragments */
2986 static int selinux_parse_skb(struct sk_buff
*skb
, struct avc_audit_data
*ad
,
2987 char **addrp
, int *len
, int src
)
2991 switch (ad
->u
.net
.family
) {
2993 ret
= selinux_parse_skb_ipv4(skb
, ad
);
2997 *addrp
= (char *)(src
? &ad
->u
.net
.v4info
.saddr
:
2998 &ad
->u
.net
.v4info
.daddr
);
3001 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3003 ret
= selinux_parse_skb_ipv6(skb
, ad
);
3007 *addrp
= (char *)(src
? &ad
->u
.net
.v6info
.saddr
:
3008 &ad
->u
.net
.v6info
.daddr
);
3018 /* socket security operations */
3019 static int socket_has_perm(struct task_struct
*task
, struct socket
*sock
,
3022 struct inode_security_struct
*isec
;
3023 struct task_security_struct
*tsec
;
3024 struct avc_audit_data ad
;
3027 tsec
= task
->security
;
3028 isec
= SOCK_INODE(sock
)->i_security
;
3030 if (isec
->sid
== SECINITSID_KERNEL
)
3033 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3034 ad
.u
.net
.sk
= sock
->sk
;
3035 err
= avc_has_perm(tsec
->sid
, isec
->sid
, isec
->sclass
, perms
, &ad
);
3041 static int selinux_socket_create(int family
, int type
,
3042 int protocol
, int kern
)
3045 struct task_security_struct
*tsec
;
3051 tsec
= current
->security
;
3052 newsid
= tsec
->sockcreate_sid
? : tsec
->sid
;
3053 err
= avc_has_perm(tsec
->sid
, newsid
,
3054 socket_type_to_security_class(family
, type
,
3055 protocol
), SOCKET__CREATE
, NULL
);
3061 static void selinux_socket_post_create(struct socket
*sock
, int family
,
3062 int type
, int protocol
, int kern
)
3064 struct inode_security_struct
*isec
;
3065 struct task_security_struct
*tsec
;
3066 struct sk_security_struct
*sksec
;
3069 isec
= SOCK_INODE(sock
)->i_security
;
3071 tsec
= current
->security
;
3072 newsid
= tsec
->sockcreate_sid
? : tsec
->sid
;
3073 isec
->sclass
= socket_type_to_security_class(family
, type
, protocol
);
3074 isec
->sid
= kern
? SECINITSID_KERNEL
: newsid
;
3075 isec
->initialized
= 1;
3078 sksec
= sock
->sk
->sk_security
;
3079 sksec
->sid
= isec
->sid
;
3085 /* Range of port numbers used to automatically bind.
3086 Need to determine whether we should perform a name_bind
3087 permission check between the socket and the port number. */
3088 #define ip_local_port_range_0 sysctl_local_port_range[0]
3089 #define ip_local_port_range_1 sysctl_local_port_range[1]
3091 static int selinux_socket_bind(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
3096 err
= socket_has_perm(current
, sock
, SOCKET__BIND
);
3101 * If PF_INET or PF_INET6, check name_bind permission for the port.
3102 * Multiple address binding for SCTP is not supported yet: we just
3103 * check the first address now.
3105 family
= sock
->sk
->sk_family
;
3106 if (family
== PF_INET
|| family
== PF_INET6
) {
3108 struct inode_security_struct
*isec
;
3109 struct task_security_struct
*tsec
;
3110 struct avc_audit_data ad
;
3111 struct sockaddr_in
*addr4
= NULL
;
3112 struct sockaddr_in6
*addr6
= NULL
;
3113 unsigned short snum
;
3114 struct sock
*sk
= sock
->sk
;
3115 u32 sid
, node_perm
, addrlen
;
3117 tsec
= current
->security
;
3118 isec
= SOCK_INODE(sock
)->i_security
;
3120 if (family
== PF_INET
) {
3121 addr4
= (struct sockaddr_in
*)address
;
3122 snum
= ntohs(addr4
->sin_port
);
3123 addrlen
= sizeof(addr4
->sin_addr
.s_addr
);
3124 addrp
= (char *)&addr4
->sin_addr
.s_addr
;
3126 addr6
= (struct sockaddr_in6
*)address
;
3127 snum
= ntohs(addr6
->sin6_port
);
3128 addrlen
= sizeof(addr6
->sin6_addr
.s6_addr
);
3129 addrp
= (char *)&addr6
->sin6_addr
.s6_addr
;
3132 if (snum
&&(snum
< max(PROT_SOCK
,ip_local_port_range_0
) ||
3133 snum
> ip_local_port_range_1
)) {
3134 err
= security_port_sid(sk
->sk_family
, sk
->sk_type
,
3135 sk
->sk_protocol
, snum
, &sid
);
3138 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3139 ad
.u
.net
.sport
= htons(snum
);
3140 ad
.u
.net
.family
= family
;
3141 err
= avc_has_perm(isec
->sid
, sid
,
3143 SOCKET__NAME_BIND
, &ad
);
3148 switch(isec
->sclass
) {
3149 case SECCLASS_TCP_SOCKET
:
3150 node_perm
= TCP_SOCKET__NODE_BIND
;
3153 case SECCLASS_UDP_SOCKET
:
3154 node_perm
= UDP_SOCKET__NODE_BIND
;
3158 node_perm
= RAWIP_SOCKET__NODE_BIND
;
3162 err
= security_node_sid(family
, addrp
, addrlen
, &sid
);
3166 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3167 ad
.u
.net
.sport
= htons(snum
);
3168 ad
.u
.net
.family
= family
;
3170 if (family
== PF_INET
)
3171 ad
.u
.net
.v4info
.saddr
= addr4
->sin_addr
.s_addr
;
3173 ipv6_addr_copy(&ad
.u
.net
.v6info
.saddr
, &addr6
->sin6_addr
);
3175 err
= avc_has_perm(isec
->sid
, sid
,
3176 isec
->sclass
, node_perm
, &ad
);
3184 static int selinux_socket_connect(struct socket
*sock
, struct sockaddr
*address
, int addrlen
)
3186 struct inode_security_struct
*isec
;
3189 err
= socket_has_perm(current
, sock
, SOCKET__CONNECT
);
3194 * If a TCP socket, check name_connect permission for the port.
3196 isec
= SOCK_INODE(sock
)->i_security
;
3197 if (isec
->sclass
== SECCLASS_TCP_SOCKET
) {
3198 struct sock
*sk
= sock
->sk
;
3199 struct avc_audit_data ad
;
3200 struct sockaddr_in
*addr4
= NULL
;
3201 struct sockaddr_in6
*addr6
= NULL
;
3202 unsigned short snum
;
3205 if (sk
->sk_family
== PF_INET
) {
3206 addr4
= (struct sockaddr_in
*)address
;
3207 if (addrlen
< sizeof(struct sockaddr_in
))
3209 snum
= ntohs(addr4
->sin_port
);
3211 addr6
= (struct sockaddr_in6
*)address
;
3212 if (addrlen
< SIN6_LEN_RFC2133
)
3214 snum
= ntohs(addr6
->sin6_port
);
3217 err
= security_port_sid(sk
->sk_family
, sk
->sk_type
,
3218 sk
->sk_protocol
, snum
, &sid
);
3222 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3223 ad
.u
.net
.dport
= htons(snum
);
3224 ad
.u
.net
.family
= sk
->sk_family
;
3225 err
= avc_has_perm(isec
->sid
, sid
, isec
->sclass
,
3226 TCP_SOCKET__NAME_CONNECT
, &ad
);
3235 static int selinux_socket_listen(struct socket
*sock
, int backlog
)
3237 return socket_has_perm(current
, sock
, SOCKET__LISTEN
);
3240 static int selinux_socket_accept(struct socket
*sock
, struct socket
*newsock
)
3243 struct inode_security_struct
*isec
;
3244 struct inode_security_struct
*newisec
;
3246 err
= socket_has_perm(current
, sock
, SOCKET__ACCEPT
);
3250 newisec
= SOCK_INODE(newsock
)->i_security
;
3252 isec
= SOCK_INODE(sock
)->i_security
;
3253 newisec
->sclass
= isec
->sclass
;
3254 newisec
->sid
= isec
->sid
;
3255 newisec
->initialized
= 1;
3260 static int selinux_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3263 return socket_has_perm(current
, sock
, SOCKET__WRITE
);
3266 static int selinux_socket_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
3267 int size
, int flags
)
3269 return socket_has_perm(current
, sock
, SOCKET__READ
);
3272 static int selinux_socket_getsockname(struct socket
*sock
)
3274 return socket_has_perm(current
, sock
, SOCKET__GETATTR
);
3277 static int selinux_socket_getpeername(struct socket
*sock
)
3279 return socket_has_perm(current
, sock
, SOCKET__GETATTR
);
3282 static int selinux_socket_setsockopt(struct socket
*sock
,int level
,int optname
)
3284 return socket_has_perm(current
, sock
, SOCKET__SETOPT
);
3287 static int selinux_socket_getsockopt(struct socket
*sock
, int level
,
3290 return socket_has_perm(current
, sock
, SOCKET__GETOPT
);
3293 static int selinux_socket_shutdown(struct socket
*sock
, int how
)
3295 return socket_has_perm(current
, sock
, SOCKET__SHUTDOWN
);
3298 static int selinux_socket_unix_stream_connect(struct socket
*sock
,
3299 struct socket
*other
,
3302 struct sk_security_struct
*ssec
;
3303 struct inode_security_struct
*isec
;
3304 struct inode_security_struct
*other_isec
;
3305 struct avc_audit_data ad
;
3308 err
= secondary_ops
->unix_stream_connect(sock
, other
, newsk
);
3312 isec
= SOCK_INODE(sock
)->i_security
;
3313 other_isec
= SOCK_INODE(other
)->i_security
;
3315 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3316 ad
.u
.net
.sk
= other
->sk
;
3318 err
= avc_has_perm(isec
->sid
, other_isec
->sid
,
3320 UNIX_STREAM_SOCKET__CONNECTTO
, &ad
);
3324 /* connecting socket */
3325 ssec
= sock
->sk
->sk_security
;
3326 ssec
->peer_sid
= other_isec
->sid
;
3328 /* server child socket */
3329 ssec
= newsk
->sk_security
;
3330 ssec
->peer_sid
= isec
->sid
;
3335 static int selinux_socket_unix_may_send(struct socket
*sock
,
3336 struct socket
*other
)
3338 struct inode_security_struct
*isec
;
3339 struct inode_security_struct
*other_isec
;
3340 struct avc_audit_data ad
;
3343 isec
= SOCK_INODE(sock
)->i_security
;
3344 other_isec
= SOCK_INODE(other
)->i_security
;
3346 AVC_AUDIT_DATA_INIT(&ad
,NET
);
3347 ad
.u
.net
.sk
= other
->sk
;
3349 err
= avc_has_perm(isec
->sid
, other_isec
->sid
,
3350 isec
->sclass
, SOCKET__SENDTO
, &ad
);
3357 static int selinux_sock_rcv_skb_compat(struct sock
*sk
, struct sk_buff
*skb
,
3358 struct avc_audit_data
*ad
, u32 sock_sid
, u16 sock_class
,
3359 u16 family
, char *addrp
, int len
)
3362 u32 netif_perm
, node_perm
, node_sid
, if_sid
, recv_perm
= 0;
3367 err
= sel_netif_sids(skb
->dev
, &if_sid
, NULL
);
3371 switch (sock_class
) {
3372 case SECCLASS_UDP_SOCKET
:
3373 netif_perm
= NETIF__UDP_RECV
;
3374 node_perm
= NODE__UDP_RECV
;
3375 recv_perm
= UDP_SOCKET__RECV_MSG
;
3378 case SECCLASS_TCP_SOCKET
:
3379 netif_perm
= NETIF__TCP_RECV
;
3380 node_perm
= NODE__TCP_RECV
;
3381 recv_perm
= TCP_SOCKET__RECV_MSG
;
3385 netif_perm
= NETIF__RAWIP_RECV
;
3386 node_perm
= NODE__RAWIP_RECV
;
3390 err
= avc_has_perm(sock_sid
, if_sid
, SECCLASS_NETIF
, netif_perm
, ad
);
3394 err
= security_node_sid(family
, addrp
, len
, &node_sid
);
3398 err
= avc_has_perm(sock_sid
, node_sid
, SECCLASS_NODE
, node_perm
, ad
);
3405 err
= security_port_sid(sk
->sk_family
, sk
->sk_type
,
3406 sk
->sk_protocol
, ntohs(ad
->u
.net
.sport
),
3411 err
= avc_has_perm(sock_sid
, port_sid
,
3412 sock_class
, recv_perm
, ad
);
3419 static int selinux_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3426 struct socket
*sock
;
3427 struct avc_audit_data ad
;
3429 family
= sk
->sk_family
;
3430 if (family
!= PF_INET
&& family
!= PF_INET6
)
3433 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
3434 if (family
== PF_INET6
&& skb
->protocol
== ntohs(ETH_P_IP
))
3437 read_lock_bh(&sk
->sk_callback_lock
);
3438 sock
= sk
->sk_socket
;
3440 struct inode
*inode
;
3441 inode
= SOCK_INODE(sock
);
3443 struct inode_security_struct
*isec
;
3444 isec
= inode
->i_security
;
3445 sock_sid
= isec
->sid
;
3446 sock_class
= isec
->sclass
;
3449 read_unlock_bh(&sk
->sk_callback_lock
);
3453 AVC_AUDIT_DATA_INIT(&ad
, NET
);
3454 ad
.u
.net
.netif
= skb
->dev
? skb
->dev
->name
: "[unknown]";
3455 ad
.u
.net
.family
= family
;
3457 err
= selinux_parse_skb(skb
, &ad
, &addrp
, &len
, 1);
3461 if (selinux_compat_net
)
3462 err
= selinux_sock_rcv_skb_compat(sk
, skb
, &ad
, sock_sid
,
3466 err
= avc_has_perm(sock_sid
, skb
->secmark
, SECCLASS_PACKET
,
3471 err
= selinux_xfrm_sock_rcv_skb(sock_sid
, skb
, &ad
);
3476 static int selinux_socket_getpeersec_stream(struct socket
*sock
, char __user
*optval
,
3477 int __user
*optlen
, unsigned len
)
3482 struct sk_security_struct
*ssec
;
3483 struct inode_security_struct
*isec
;
3486 isec
= SOCK_INODE(sock
)->i_security
;
3488 /* if UNIX_STREAM check peer_sid, if TCP check dst for labelled sa */
3489 if (isec
->sclass
== SECCLASS_UNIX_STREAM_SOCKET
) {
3490 ssec
= sock
->sk
->sk_security
;
3491 peer_sid
= ssec
->peer_sid
;
3493 else if (isec
->sclass
== SECCLASS_TCP_SOCKET
) {
3494 peer_sid
= selinux_socket_getpeer_stream(sock
->sk
);
3496 if (peer_sid
== SECSID_NULL
) {
3506 err
= security_sid_to_context(peer_sid
, &scontext
, &scontext_len
);
3511 if (scontext_len
> len
) {
3516 if (copy_to_user(optval
, scontext
, scontext_len
))
3520 if (put_user(scontext_len
, optlen
))
3528 static int selinux_socket_getpeersec_dgram(struct socket
*sock
, struct sk_buff
*skb
, u32
*secid
)
3530 u32 peer_secid
= SECSID_NULL
;
3533 if (sock
&& (sock
->sk
->sk_family
== PF_UNIX
))
3534 selinux_get_inode_sid(SOCK_INODE(sock
), &peer_secid
);
3536 peer_secid
= selinux_socket_getpeer_dgram(skb
);
3538 if (peer_secid
== SECSID_NULL
)
3540 *secid
= peer_secid
;
3545 static int selinux_sk_alloc_security(struct sock
*sk
, int family
, gfp_t priority
)
3547 return sk_alloc_security(sk
, family
, priority
);
3550 static void selinux_sk_free_security(struct sock
*sk
)
3552 sk_free_security(sk
);
3555 static void selinux_sk_clone_security(const struct sock
*sk
, struct sock
*newsk
)
3557 struct sk_security_struct
*ssec
= sk
->sk_security
;
3558 struct sk_security_struct
*newssec
= newsk
->sk_security
;
3560 newssec
->sid
= ssec
->sid
;
3561 newssec
->peer_sid
= ssec
->peer_sid
;
3564 static unsigned int selinux_sk_getsid_security(struct sock
*sk
, struct flowi
*fl
, u8 dir
)
3567 return selinux_no_sk_sid(fl
);
3569 struct sk_security_struct
*sksec
= sk
->sk_security
;
3575 static int selinux_nlmsg_perm(struct sock
*sk
, struct sk_buff
*skb
)
3579 struct nlmsghdr
*nlh
;
3580 struct socket
*sock
= sk
->sk_socket
;
3581 struct inode_security_struct
*isec
= SOCK_INODE(sock
)->i_security
;
3583 if (skb
->len
< NLMSG_SPACE(0)) {
3587 nlh
= (struct nlmsghdr
*)skb
->data
;
3589 err
= selinux_nlmsg_lookup(isec
->sclass
, nlh
->nlmsg_type
, &perm
);
3591 if (err
== -EINVAL
) {
3592 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
3593 "SELinux: unrecognized netlink message"
3594 " type=%hu for sclass=%hu\n",
3595 nlh
->nlmsg_type
, isec
->sclass
);
3596 if (!selinux_enforcing
)
3606 err
= socket_has_perm(current
, sock
, perm
);
3611 #ifdef CONFIG_NETFILTER
3613 static int selinux_ip_postroute_last_compat(struct sock
*sk
, struct net_device
*dev
,
3614 struct inode_security_struct
*isec
,
3615 struct avc_audit_data
*ad
,
3616 u16 family
, char *addrp
, int len
)
3619 u32 netif_perm
, node_perm
, node_sid
, if_sid
, send_perm
= 0;
3621 err
= sel_netif_sids(dev
, &if_sid
, NULL
);
3625 switch (isec
->sclass
) {
3626 case SECCLASS_UDP_SOCKET
:
3627 netif_perm
= NETIF__UDP_SEND
;
3628 node_perm
= NODE__UDP_SEND
;
3629 send_perm
= UDP_SOCKET__SEND_MSG
;
3632 case SECCLASS_TCP_SOCKET
:
3633 netif_perm
= NETIF__TCP_SEND
;
3634 node_perm
= NODE__TCP_SEND
;
3635 send_perm
= TCP_SOCKET__SEND_MSG
;
3639 netif_perm
= NETIF__RAWIP_SEND
;
3640 node_perm
= NODE__RAWIP_SEND
;
3644 err
= avc_has_perm(isec
->sid
, if_sid
, SECCLASS_NETIF
, netif_perm
, ad
);
3648 err
= security_node_sid(family
, addrp
, len
, &node_sid
);
3652 err
= avc_has_perm(isec
->sid
, node_sid
, SECCLASS_NODE
, node_perm
, ad
);
3659 err
= security_port_sid(sk
->sk_family
,
3662 ntohs(ad
->u
.net
.dport
),
3667 err
= avc_has_perm(isec
->sid
, port_sid
, isec
->sclass
,
3674 static unsigned int selinux_ip_postroute_last(unsigned int hooknum
,
3675 struct sk_buff
**pskb
,
3676 const struct net_device
*in
,
3677 const struct net_device
*out
,
3678 int (*okfn
)(struct sk_buff
*),
3684 struct socket
*sock
;
3685 struct inode
*inode
;
3686 struct sk_buff
*skb
= *pskb
;
3687 struct inode_security_struct
*isec
;
3688 struct avc_audit_data ad
;
3689 struct net_device
*dev
= (struct net_device
*)out
;
3695 sock
= sk
->sk_socket
;
3699 inode
= SOCK_INODE(sock
);
3703 isec
= inode
->i_security
;
3705 AVC_AUDIT_DATA_INIT(&ad
, NET
);
3706 ad
.u
.net
.netif
= dev
->name
;
3707 ad
.u
.net
.family
= family
;
3709 err
= selinux_parse_skb(skb
, &ad
, &addrp
, &len
, 0);
3713 if (selinux_compat_net
)
3714 err
= selinux_ip_postroute_last_compat(sk
, dev
, isec
, &ad
,
3715 family
, addrp
, len
);
3717 err
= avc_has_perm(isec
->sid
, skb
->secmark
, SECCLASS_PACKET
,
3723 err
= selinux_xfrm_postroute_last(isec
->sid
, skb
, &ad
);
3725 return err
? NF_DROP
: NF_ACCEPT
;
3728 static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum
,
3729 struct sk_buff
**pskb
,
3730 const struct net_device
*in
,
3731 const struct net_device
*out
,
3732 int (*okfn
)(struct sk_buff
*))
3734 return selinux_ip_postroute_last(hooknum
, pskb
, in
, out
, okfn
, PF_INET
);
3737 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3739 static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum
,
3740 struct sk_buff
**pskb
,
3741 const struct net_device
*in
,
3742 const struct net_device
*out
,
3743 int (*okfn
)(struct sk_buff
*))
3745 return selinux_ip_postroute_last(hooknum
, pskb
, in
, out
, okfn
, PF_INET6
);
3750 #endif /* CONFIG_NETFILTER */
3752 static int selinux_netlink_send(struct sock
*sk
, struct sk_buff
*skb
)
3756 err
= secondary_ops
->netlink_send(sk
, skb
);
3760 if (policydb_loaded_version
>= POLICYDB_VERSION_NLCLASS
)
3761 err
= selinux_nlmsg_perm(sk
, skb
);
3766 static int selinux_netlink_recv(struct sk_buff
*skb
, int capability
)
3769 struct avc_audit_data ad
;
3771 err
= secondary_ops
->netlink_recv(skb
, capability
);
3775 AVC_AUDIT_DATA_INIT(&ad
, CAP
);
3776 ad
.u
.cap
= capability
;
3778 return avc_has_perm(NETLINK_CB(skb
).sid
, NETLINK_CB(skb
).sid
,
3779 SECCLASS_CAPABILITY
, CAP_TO_MASK(capability
), &ad
);
3782 static int ipc_alloc_security(struct task_struct
*task
,
3783 struct kern_ipc_perm
*perm
,
3786 struct task_security_struct
*tsec
= task
->security
;
3787 struct ipc_security_struct
*isec
;
3789 isec
= kzalloc(sizeof(struct ipc_security_struct
), GFP_KERNEL
);
3793 isec
->sclass
= sclass
;
3794 isec
->ipc_perm
= perm
;
3795 isec
->sid
= tsec
->sid
;
3796 perm
->security
= isec
;
3801 static void ipc_free_security(struct kern_ipc_perm
*perm
)
3803 struct ipc_security_struct
*isec
= perm
->security
;
3804 perm
->security
= NULL
;
3808 static int msg_msg_alloc_security(struct msg_msg
*msg
)
3810 struct msg_security_struct
*msec
;
3812 msec
= kzalloc(sizeof(struct msg_security_struct
), GFP_KERNEL
);
3817 msec
->sid
= SECINITSID_UNLABELED
;
3818 msg
->security
= msec
;
3823 static void msg_msg_free_security(struct msg_msg
*msg
)
3825 struct msg_security_struct
*msec
= msg
->security
;
3827 msg
->security
= NULL
;
3831 static int ipc_has_perm(struct kern_ipc_perm
*ipc_perms
,
3834 struct task_security_struct
*tsec
;
3835 struct ipc_security_struct
*isec
;
3836 struct avc_audit_data ad
;
3838 tsec
= current
->security
;
3839 isec
= ipc_perms
->security
;
3841 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
3842 ad
.u
.ipc_id
= ipc_perms
->key
;
3844 return avc_has_perm(tsec
->sid
, isec
->sid
, isec
->sclass
, perms
, &ad
);
3847 static int selinux_msg_msg_alloc_security(struct msg_msg
*msg
)
3849 return msg_msg_alloc_security(msg
);
3852 static void selinux_msg_msg_free_security(struct msg_msg
*msg
)
3854 msg_msg_free_security(msg
);
3857 /* message queue security operations */
3858 static int selinux_msg_queue_alloc_security(struct msg_queue
*msq
)
3860 struct task_security_struct
*tsec
;
3861 struct ipc_security_struct
*isec
;
3862 struct avc_audit_data ad
;
3865 rc
= ipc_alloc_security(current
, &msq
->q_perm
, SECCLASS_MSGQ
);
3869 tsec
= current
->security
;
3870 isec
= msq
->q_perm
.security
;
3872 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
3873 ad
.u
.ipc_id
= msq
->q_perm
.key
;
3875 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_MSGQ
,
3878 ipc_free_security(&msq
->q_perm
);
3884 static void selinux_msg_queue_free_security(struct msg_queue
*msq
)
3886 ipc_free_security(&msq
->q_perm
);
3889 static int selinux_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3891 struct task_security_struct
*tsec
;
3892 struct ipc_security_struct
*isec
;
3893 struct avc_audit_data ad
;
3895 tsec
= current
->security
;
3896 isec
= msq
->q_perm
.security
;
3898 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
3899 ad
.u
.ipc_id
= msq
->q_perm
.key
;
3901 return avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_MSGQ
,
3902 MSGQ__ASSOCIATE
, &ad
);
3905 static int selinux_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3913 /* No specific object, just general system-wide information. */
3914 return task_has_system(current
, SYSTEM__IPC_INFO
);
3917 perms
= MSGQ__GETATTR
| MSGQ__ASSOCIATE
;
3920 perms
= MSGQ__SETATTR
;
3923 perms
= MSGQ__DESTROY
;
3929 err
= ipc_has_perm(&msq
->q_perm
, perms
);
3933 static int selinux_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
, int msqflg
)
3935 struct task_security_struct
*tsec
;
3936 struct ipc_security_struct
*isec
;
3937 struct msg_security_struct
*msec
;
3938 struct avc_audit_data ad
;
3941 tsec
= current
->security
;
3942 isec
= msq
->q_perm
.security
;
3943 msec
= msg
->security
;
3946 * First time through, need to assign label to the message
3948 if (msec
->sid
== SECINITSID_UNLABELED
) {
3950 * Compute new sid based on current process and
3951 * message queue this message will be stored in
3953 rc
= security_transition_sid(tsec
->sid
,
3961 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
3962 ad
.u
.ipc_id
= msq
->q_perm
.key
;
3964 /* Can this process write to the queue? */
3965 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_MSGQ
,
3968 /* Can this process send the message */
3969 rc
= avc_has_perm(tsec
->sid
, msec
->sid
,
3970 SECCLASS_MSG
, MSG__SEND
, &ad
);
3972 /* Can the message be put in the queue? */
3973 rc
= avc_has_perm(msec
->sid
, isec
->sid
,
3974 SECCLASS_MSGQ
, MSGQ__ENQUEUE
, &ad
);
3979 static int selinux_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3980 struct task_struct
*target
,
3981 long type
, int mode
)
3983 struct task_security_struct
*tsec
;
3984 struct ipc_security_struct
*isec
;
3985 struct msg_security_struct
*msec
;
3986 struct avc_audit_data ad
;
3989 tsec
= target
->security
;
3990 isec
= msq
->q_perm
.security
;
3991 msec
= msg
->security
;
3993 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
3994 ad
.u
.ipc_id
= msq
->q_perm
.key
;
3996 rc
= avc_has_perm(tsec
->sid
, isec
->sid
,
3997 SECCLASS_MSGQ
, MSGQ__READ
, &ad
);
3999 rc
= avc_has_perm(tsec
->sid
, msec
->sid
,
4000 SECCLASS_MSG
, MSG__RECEIVE
, &ad
);
4004 /* Shared Memory security operations */
4005 static int selinux_shm_alloc_security(struct shmid_kernel
*shp
)
4007 struct task_security_struct
*tsec
;
4008 struct ipc_security_struct
*isec
;
4009 struct avc_audit_data ad
;
4012 rc
= ipc_alloc_security(current
, &shp
->shm_perm
, SECCLASS_SHM
);
4016 tsec
= current
->security
;
4017 isec
= shp
->shm_perm
.security
;
4019 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
4020 ad
.u
.ipc_id
= shp
->shm_perm
.key
;
4022 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_SHM
,
4025 ipc_free_security(&shp
->shm_perm
);
4031 static void selinux_shm_free_security(struct shmid_kernel
*shp
)
4033 ipc_free_security(&shp
->shm_perm
);
4036 static int selinux_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
4038 struct task_security_struct
*tsec
;
4039 struct ipc_security_struct
*isec
;
4040 struct avc_audit_data ad
;
4042 tsec
= current
->security
;
4043 isec
= shp
->shm_perm
.security
;
4045 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
4046 ad
.u
.ipc_id
= shp
->shm_perm
.key
;
4048 return avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_SHM
,
4049 SHM__ASSOCIATE
, &ad
);
4052 /* Note, at this point, shp is locked down */
4053 static int selinux_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
4061 /* No specific object, just general system-wide information. */
4062 return task_has_system(current
, SYSTEM__IPC_INFO
);
4065 perms
= SHM__GETATTR
| SHM__ASSOCIATE
;
4068 perms
= SHM__SETATTR
;
4075 perms
= SHM__DESTROY
;
4081 err
= ipc_has_perm(&shp
->shm_perm
, perms
);
4085 static int selinux_shm_shmat(struct shmid_kernel
*shp
,
4086 char __user
*shmaddr
, int shmflg
)
4091 rc
= secondary_ops
->shm_shmat(shp
, shmaddr
, shmflg
);
4095 if (shmflg
& SHM_RDONLY
)
4098 perms
= SHM__READ
| SHM__WRITE
;
4100 return ipc_has_perm(&shp
->shm_perm
, perms
);
4103 /* Semaphore security operations */
4104 static int selinux_sem_alloc_security(struct sem_array
*sma
)
4106 struct task_security_struct
*tsec
;
4107 struct ipc_security_struct
*isec
;
4108 struct avc_audit_data ad
;
4111 rc
= ipc_alloc_security(current
, &sma
->sem_perm
, SECCLASS_SEM
);
4115 tsec
= current
->security
;
4116 isec
= sma
->sem_perm
.security
;
4118 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
4119 ad
.u
.ipc_id
= sma
->sem_perm
.key
;
4121 rc
= avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_SEM
,
4124 ipc_free_security(&sma
->sem_perm
);
4130 static void selinux_sem_free_security(struct sem_array
*sma
)
4132 ipc_free_security(&sma
->sem_perm
);
4135 static int selinux_sem_associate(struct sem_array
*sma
, int semflg
)
4137 struct task_security_struct
*tsec
;
4138 struct ipc_security_struct
*isec
;
4139 struct avc_audit_data ad
;
4141 tsec
= current
->security
;
4142 isec
= sma
->sem_perm
.security
;
4144 AVC_AUDIT_DATA_INIT(&ad
, IPC
);
4145 ad
.u
.ipc_id
= sma
->sem_perm
.key
;
4147 return avc_has_perm(tsec
->sid
, isec
->sid
, SECCLASS_SEM
,
4148 SEM__ASSOCIATE
, &ad
);
4151 /* Note, at this point, sma is locked down */
4152 static int selinux_sem_semctl(struct sem_array
*sma
, int cmd
)
4160 /* No specific object, just general system-wide information. */
4161 return task_has_system(current
, SYSTEM__IPC_INFO
);
4165 perms
= SEM__GETATTR
;
4176 perms
= SEM__DESTROY
;
4179 perms
= SEM__SETATTR
;
4183 perms
= SEM__GETATTR
| SEM__ASSOCIATE
;
4189 err
= ipc_has_perm(&sma
->sem_perm
, perms
);
4193 static int selinux_sem_semop(struct sem_array
*sma
,
4194 struct sembuf
*sops
, unsigned nsops
, int alter
)
4199 perms
= SEM__READ
| SEM__WRITE
;
4203 return ipc_has_perm(&sma
->sem_perm
, perms
);
4206 static int selinux_ipc_permission(struct kern_ipc_perm
*ipcp
, short flag
)
4212 av
|= IPC__UNIX_READ
;
4214 av
|= IPC__UNIX_WRITE
;
4219 return ipc_has_perm(ipcp
, av
);
4222 /* module stacking operations */
4223 static int selinux_register_security (const char *name
, struct security_operations
*ops
)
4225 if (secondary_ops
!= original_ops
) {
4226 printk(KERN_INFO
"%s: There is already a secondary security "
4227 "module registered.\n", __FUNCTION__
);
4231 secondary_ops
= ops
;
4233 printk(KERN_INFO
"%s: Registering secondary module %s\n",
4240 static int selinux_unregister_security (const char *name
, struct security_operations
*ops
)
4242 if (ops
!= secondary_ops
) {
4243 printk (KERN_INFO
"%s: trying to unregister a security module "
4244 "that is not registered.\n", __FUNCTION__
);
4248 secondary_ops
= original_ops
;
4253 static void selinux_d_instantiate (struct dentry
*dentry
, struct inode
*inode
)
4256 inode_doinit_with_dentry(inode
, dentry
);
4259 static int selinux_getprocattr(struct task_struct
*p
,
4260 char *name
, void *value
, size_t size
)
4262 struct task_security_struct
*tsec
;
4267 error
= task_has_perm(current
, p
, PROCESS__GETATTR
);
4274 if (!strcmp(name
, "current"))
4276 else if (!strcmp(name
, "prev"))
4278 else if (!strcmp(name
, "exec"))
4279 sid
= tsec
->exec_sid
;
4280 else if (!strcmp(name
, "fscreate"))
4281 sid
= tsec
->create_sid
;
4282 else if (!strcmp(name
, "keycreate"))
4283 sid
= tsec
->keycreate_sid
;
4284 else if (!strcmp(name
, "sockcreate"))
4285 sid
= tsec
->sockcreate_sid
;
4292 return selinux_getsecurity(sid
, value
, size
);
4295 static int selinux_setprocattr(struct task_struct
*p
,
4296 char *name
, void *value
, size_t size
)
4298 struct task_security_struct
*tsec
;
4304 /* SELinux only allows a process to change its own
4305 security attributes. */
4310 * Basic control over ability to set these attributes at all.
4311 * current == p, but we'll pass them separately in case the
4312 * above restriction is ever removed.
4314 if (!strcmp(name
, "exec"))
4315 error
= task_has_perm(current
, p
, PROCESS__SETEXEC
);
4316 else if (!strcmp(name
, "fscreate"))
4317 error
= task_has_perm(current
, p
, PROCESS__SETFSCREATE
);
4318 else if (!strcmp(name
, "keycreate"))
4319 error
= task_has_perm(current
, p
, PROCESS__SETKEYCREATE
);
4320 else if (!strcmp(name
, "sockcreate"))
4321 error
= task_has_perm(current
, p
, PROCESS__SETSOCKCREATE
);
4322 else if (!strcmp(name
, "current"))
4323 error
= task_has_perm(current
, p
, PROCESS__SETCURRENT
);
4329 /* Obtain a SID for the context, if one was specified. */
4330 if (size
&& str
[1] && str
[1] != '\n') {
4331 if (str
[size
-1] == '\n') {
4335 error
= security_context_to_sid(value
, size
, &sid
);
4340 /* Permission checking based on the specified context is
4341 performed during the actual operation (execve,
4342 open/mkdir/...), when we know the full context of the
4343 operation. See selinux_bprm_set_security for the execve
4344 checks and may_create for the file creation checks. The
4345 operation will then fail if the context is not permitted. */
4347 if (!strcmp(name
, "exec"))
4348 tsec
->exec_sid
= sid
;
4349 else if (!strcmp(name
, "fscreate"))
4350 tsec
->create_sid
= sid
;
4351 else if (!strcmp(name
, "keycreate")) {
4352 error
= may_create_key(sid
, p
);
4355 tsec
->keycreate_sid
= sid
;
4356 } else if (!strcmp(name
, "sockcreate"))
4357 tsec
->sockcreate_sid
= sid
;
4358 else if (!strcmp(name
, "current")) {
4359 struct av_decision avd
;
4364 /* Only allow single threaded processes to change context */
4365 if (atomic_read(&p
->mm
->mm_users
) != 1) {
4366 struct task_struct
*g
, *t
;
4367 struct mm_struct
*mm
= p
->mm
;
4368 read_lock(&tasklist_lock
);
4369 do_each_thread(g
, t
)
4370 if (t
->mm
== mm
&& t
!= p
) {
4371 read_unlock(&tasklist_lock
);
4374 while_each_thread(g
, t
);
4375 read_unlock(&tasklist_lock
);
4378 /* Check permissions for the transition. */
4379 error
= avc_has_perm(tsec
->sid
, sid
, SECCLASS_PROCESS
,
4380 PROCESS__DYNTRANSITION
, NULL
);
4384 /* Check for ptracing, and update the task SID if ok.
4385 Otherwise, leave SID unchanged and fail. */
4387 if (p
->ptrace
& PT_PTRACED
) {
4388 error
= avc_has_perm_noaudit(tsec
->ptrace_sid
, sid
,
4390 PROCESS__PTRACE
, &avd
);
4394 avc_audit(tsec
->ptrace_sid
, sid
, SECCLASS_PROCESS
,
4395 PROCESS__PTRACE
, &avd
, error
, NULL
);
4409 static int selinux_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4411 return security_sid_to_context(secid
, secdata
, seclen
);
4414 static void selinux_release_secctx(char *secdata
, u32 seclen
)
4422 static int selinux_key_alloc(struct key
*k
, struct task_struct
*tsk
,
4423 unsigned long flags
)
4425 struct task_security_struct
*tsec
= tsk
->security
;
4426 struct key_security_struct
*ksec
;
4428 ksec
= kzalloc(sizeof(struct key_security_struct
), GFP_KERNEL
);
4433 if (tsec
->keycreate_sid
)
4434 ksec
->sid
= tsec
->keycreate_sid
;
4436 ksec
->sid
= tsec
->sid
;
4442 static void selinux_key_free(struct key
*k
)
4444 struct key_security_struct
*ksec
= k
->security
;
4450 static int selinux_key_permission(key_ref_t key_ref
,
4451 struct task_struct
*ctx
,
4455 struct task_security_struct
*tsec
;
4456 struct key_security_struct
*ksec
;
4458 key
= key_ref_to_ptr(key_ref
);
4460 tsec
= ctx
->security
;
4461 ksec
= key
->security
;
4463 /* if no specific permissions are requested, we skip the
4464 permission check. No serious, additional covert channels
4465 appear to be created. */
4469 return avc_has_perm(tsec
->sid
, ksec
->sid
,
4470 SECCLASS_KEY
, perm
, NULL
);
4475 static struct security_operations selinux_ops
= {
4476 .ptrace
= selinux_ptrace
,
4477 .capget
= selinux_capget
,
4478 .capset_check
= selinux_capset_check
,
4479 .capset_set
= selinux_capset_set
,
4480 .sysctl
= selinux_sysctl
,
4481 .capable
= selinux_capable
,
4482 .quotactl
= selinux_quotactl
,
4483 .quota_on
= selinux_quota_on
,
4484 .syslog
= selinux_syslog
,
4485 .vm_enough_memory
= selinux_vm_enough_memory
,
4487 .netlink_send
= selinux_netlink_send
,
4488 .netlink_recv
= selinux_netlink_recv
,
4490 .bprm_alloc_security
= selinux_bprm_alloc_security
,
4491 .bprm_free_security
= selinux_bprm_free_security
,
4492 .bprm_apply_creds
= selinux_bprm_apply_creds
,
4493 .bprm_post_apply_creds
= selinux_bprm_post_apply_creds
,
4494 .bprm_set_security
= selinux_bprm_set_security
,
4495 .bprm_check_security
= selinux_bprm_check_security
,
4496 .bprm_secureexec
= selinux_bprm_secureexec
,
4498 .sb_alloc_security
= selinux_sb_alloc_security
,
4499 .sb_free_security
= selinux_sb_free_security
,
4500 .sb_copy_data
= selinux_sb_copy_data
,
4501 .sb_kern_mount
= selinux_sb_kern_mount
,
4502 .sb_statfs
= selinux_sb_statfs
,
4503 .sb_mount
= selinux_mount
,
4504 .sb_umount
= selinux_umount
,
4506 .inode_alloc_security
= selinux_inode_alloc_security
,
4507 .inode_free_security
= selinux_inode_free_security
,
4508 .inode_init_security
= selinux_inode_init_security
,
4509 .inode_create
= selinux_inode_create
,
4510 .inode_link
= selinux_inode_link
,
4511 .inode_unlink
= selinux_inode_unlink
,
4512 .inode_symlink
= selinux_inode_symlink
,
4513 .inode_mkdir
= selinux_inode_mkdir
,
4514 .inode_rmdir
= selinux_inode_rmdir
,
4515 .inode_mknod
= selinux_inode_mknod
,
4516 .inode_rename
= selinux_inode_rename
,
4517 .inode_readlink
= selinux_inode_readlink
,
4518 .inode_follow_link
= selinux_inode_follow_link
,
4519 .inode_permission
= selinux_inode_permission
,
4520 .inode_setattr
= selinux_inode_setattr
,
4521 .inode_getattr
= selinux_inode_getattr
,
4522 .inode_setxattr
= selinux_inode_setxattr
,
4523 .inode_post_setxattr
= selinux_inode_post_setxattr
,
4524 .inode_getxattr
= selinux_inode_getxattr
,
4525 .inode_listxattr
= selinux_inode_listxattr
,
4526 .inode_removexattr
= selinux_inode_removexattr
,
4527 .inode_xattr_getsuffix
= selinux_inode_xattr_getsuffix
,
4528 .inode_getsecurity
= selinux_inode_getsecurity
,
4529 .inode_setsecurity
= selinux_inode_setsecurity
,
4530 .inode_listsecurity
= selinux_inode_listsecurity
,
4532 .file_permission
= selinux_file_permission
,
4533 .file_alloc_security
= selinux_file_alloc_security
,
4534 .file_free_security
= selinux_file_free_security
,
4535 .file_ioctl
= selinux_file_ioctl
,
4536 .file_mmap
= selinux_file_mmap
,
4537 .file_mprotect
= selinux_file_mprotect
,
4538 .file_lock
= selinux_file_lock
,
4539 .file_fcntl
= selinux_file_fcntl
,
4540 .file_set_fowner
= selinux_file_set_fowner
,
4541 .file_send_sigiotask
= selinux_file_send_sigiotask
,
4542 .file_receive
= selinux_file_receive
,
4544 .task_create
= selinux_task_create
,
4545 .task_alloc_security
= selinux_task_alloc_security
,
4546 .task_free_security
= selinux_task_free_security
,
4547 .task_setuid
= selinux_task_setuid
,
4548 .task_post_setuid
= selinux_task_post_setuid
,
4549 .task_setgid
= selinux_task_setgid
,
4550 .task_setpgid
= selinux_task_setpgid
,
4551 .task_getpgid
= selinux_task_getpgid
,
4552 .task_getsid
= selinux_task_getsid
,
4553 .task_getsecid
= selinux_task_getsecid
,
4554 .task_setgroups
= selinux_task_setgroups
,
4555 .task_setnice
= selinux_task_setnice
,
4556 .task_setioprio
= selinux_task_setioprio
,
4557 .task_getioprio
= selinux_task_getioprio
,
4558 .task_setrlimit
= selinux_task_setrlimit
,
4559 .task_setscheduler
= selinux_task_setscheduler
,
4560 .task_getscheduler
= selinux_task_getscheduler
,
4561 .task_movememory
= selinux_task_movememory
,
4562 .task_kill
= selinux_task_kill
,
4563 .task_wait
= selinux_task_wait
,
4564 .task_prctl
= selinux_task_prctl
,
4565 .task_reparent_to_init
= selinux_task_reparent_to_init
,
4566 .task_to_inode
= selinux_task_to_inode
,
4568 .ipc_permission
= selinux_ipc_permission
,
4570 .msg_msg_alloc_security
= selinux_msg_msg_alloc_security
,
4571 .msg_msg_free_security
= selinux_msg_msg_free_security
,
4573 .msg_queue_alloc_security
= selinux_msg_queue_alloc_security
,
4574 .msg_queue_free_security
= selinux_msg_queue_free_security
,
4575 .msg_queue_associate
= selinux_msg_queue_associate
,
4576 .msg_queue_msgctl
= selinux_msg_queue_msgctl
,
4577 .msg_queue_msgsnd
= selinux_msg_queue_msgsnd
,
4578 .msg_queue_msgrcv
= selinux_msg_queue_msgrcv
,
4580 .shm_alloc_security
= selinux_shm_alloc_security
,
4581 .shm_free_security
= selinux_shm_free_security
,
4582 .shm_associate
= selinux_shm_associate
,
4583 .shm_shmctl
= selinux_shm_shmctl
,
4584 .shm_shmat
= selinux_shm_shmat
,
4586 .sem_alloc_security
= selinux_sem_alloc_security
,
4587 .sem_free_security
= selinux_sem_free_security
,
4588 .sem_associate
= selinux_sem_associate
,
4589 .sem_semctl
= selinux_sem_semctl
,
4590 .sem_semop
= selinux_sem_semop
,
4592 .register_security
= selinux_register_security
,
4593 .unregister_security
= selinux_unregister_security
,
4595 .d_instantiate
= selinux_d_instantiate
,
4597 .getprocattr
= selinux_getprocattr
,
4598 .setprocattr
= selinux_setprocattr
,
4600 .secid_to_secctx
= selinux_secid_to_secctx
,
4601 .release_secctx
= selinux_release_secctx
,
4603 .unix_stream_connect
= selinux_socket_unix_stream_connect
,
4604 .unix_may_send
= selinux_socket_unix_may_send
,
4606 .socket_create
= selinux_socket_create
,
4607 .socket_post_create
= selinux_socket_post_create
,
4608 .socket_bind
= selinux_socket_bind
,
4609 .socket_connect
= selinux_socket_connect
,
4610 .socket_listen
= selinux_socket_listen
,
4611 .socket_accept
= selinux_socket_accept
,
4612 .socket_sendmsg
= selinux_socket_sendmsg
,
4613 .socket_recvmsg
= selinux_socket_recvmsg
,
4614 .socket_getsockname
= selinux_socket_getsockname
,
4615 .socket_getpeername
= selinux_socket_getpeername
,
4616 .socket_getsockopt
= selinux_socket_getsockopt
,
4617 .socket_setsockopt
= selinux_socket_setsockopt
,
4618 .socket_shutdown
= selinux_socket_shutdown
,
4619 .socket_sock_rcv_skb
= selinux_socket_sock_rcv_skb
,
4620 .socket_getpeersec_stream
= selinux_socket_getpeersec_stream
,
4621 .socket_getpeersec_dgram
= selinux_socket_getpeersec_dgram
,
4622 .sk_alloc_security
= selinux_sk_alloc_security
,
4623 .sk_free_security
= selinux_sk_free_security
,
4624 .sk_clone_security
= selinux_sk_clone_security
,
4625 .sk_getsid
= selinux_sk_getsid_security
,
4627 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4628 .xfrm_policy_alloc_security
= selinux_xfrm_policy_alloc
,
4629 .xfrm_policy_clone_security
= selinux_xfrm_policy_clone
,
4630 .xfrm_policy_free_security
= selinux_xfrm_policy_free
,
4631 .xfrm_policy_delete_security
= selinux_xfrm_policy_delete
,
4632 .xfrm_state_alloc_security
= selinux_xfrm_state_alloc
,
4633 .xfrm_state_free_security
= selinux_xfrm_state_free
,
4634 .xfrm_state_delete_security
= selinux_xfrm_state_delete
,
4635 .xfrm_policy_lookup
= selinux_xfrm_policy_lookup
,
4636 .xfrm_state_pol_flow_match
= selinux_xfrm_state_pol_flow_match
,
4637 .xfrm_flow_state_match
= selinux_xfrm_flow_state_match
,
4638 .xfrm_decode_session
= selinux_xfrm_decode_session
,
4642 .key_alloc
= selinux_key_alloc
,
4643 .key_free
= selinux_key_free
,
4644 .key_permission
= selinux_key_permission
,
4648 static __init
int selinux_init(void)
4650 struct task_security_struct
*tsec
;
4652 if (!selinux_enabled
) {
4653 printk(KERN_INFO
"SELinux: Disabled at boot.\n");
4657 printk(KERN_INFO
"SELinux: Initializing.\n");
4659 /* Set the security state for the initial task. */
4660 if (task_alloc_security(current
))
4661 panic("SELinux: Failed to initialize initial task.\n");
4662 tsec
= current
->security
;
4663 tsec
->osid
= tsec
->sid
= SECINITSID_KERNEL
;
4665 sel_inode_cache
= kmem_cache_create("selinux_inode_security",
4666 sizeof(struct inode_security_struct
),
4667 0, SLAB_PANIC
, NULL
, NULL
);
4670 original_ops
= secondary_ops
= security_ops
;
4672 panic ("SELinux: No initial security operations\n");
4673 if (register_security (&selinux_ops
))
4674 panic("SELinux: Unable to register with kernel.\n");
4676 if (selinux_enforcing
) {
4677 printk(KERN_INFO
"SELinux: Starting in enforcing mode\n");
4679 printk(KERN_INFO
"SELinux: Starting in permissive mode\n");
4683 /* Add security information to initial keyrings */
4684 selinux_key_alloc(&root_user_keyring
, current
,
4685 KEY_ALLOC_NOT_IN_QUOTA
);
4686 selinux_key_alloc(&root_session_keyring
, current
,
4687 KEY_ALLOC_NOT_IN_QUOTA
);
4693 void selinux_complete_init(void)
4695 printk(KERN_INFO
"SELinux: Completing initialization.\n");
4697 /* Set up any superblocks initialized prior to the policy load. */
4698 printk(KERN_INFO
"SELinux: Setting up existing superblocks.\n");
4699 spin_lock(&sb_lock
);
4700 spin_lock(&sb_security_lock
);
4702 if (!list_empty(&superblock_security_head
)) {
4703 struct superblock_security_struct
*sbsec
=
4704 list_entry(superblock_security_head
.next
,
4705 struct superblock_security_struct
,
4707 struct super_block
*sb
= sbsec
->sb
;
4709 spin_unlock(&sb_security_lock
);
4710 spin_unlock(&sb_lock
);
4711 down_read(&sb
->s_umount
);
4713 superblock_doinit(sb
, NULL
);
4715 spin_lock(&sb_lock
);
4716 spin_lock(&sb_security_lock
);
4717 list_del_init(&sbsec
->list
);
4720 spin_unlock(&sb_security_lock
);
4721 spin_unlock(&sb_lock
);
4724 /* SELinux requires early initialization in order to label
4725 all processes and objects when they are created. */
4726 security_initcall(selinux_init
);
4728 #if defined(CONFIG_NETFILTER)
4730 static struct nf_hook_ops selinux_ipv4_op
= {
4731 .hook
= selinux_ipv4_postroute_last
,
4732 .owner
= THIS_MODULE
,
4734 .hooknum
= NF_IP_POST_ROUTING
,
4735 .priority
= NF_IP_PRI_SELINUX_LAST
,
4738 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4740 static struct nf_hook_ops selinux_ipv6_op
= {
4741 .hook
= selinux_ipv6_postroute_last
,
4742 .owner
= THIS_MODULE
,
4744 .hooknum
= NF_IP6_POST_ROUTING
,
4745 .priority
= NF_IP6_PRI_SELINUX_LAST
,
4750 static int __init
selinux_nf_ip_init(void)
4754 if (!selinux_enabled
)
4757 printk(KERN_INFO
"SELinux: Registering netfilter hooks\n");
4759 err
= nf_register_hook(&selinux_ipv4_op
);
4761 panic("SELinux: nf_register_hook for IPv4: error %d\n", err
);
4763 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4765 err
= nf_register_hook(&selinux_ipv6_op
);
4767 panic("SELinux: nf_register_hook for IPv6: error %d\n", err
);
4775 __initcall(selinux_nf_ip_init
);
4777 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4778 static void selinux_nf_ip_exit(void)
4780 printk(KERN_INFO
"SELinux: Unregistering netfilter hooks\n");
4782 nf_unregister_hook(&selinux_ipv4_op
);
4783 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4784 nf_unregister_hook(&selinux_ipv6_op
);
4789 #else /* CONFIG_NETFILTER */
4791 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4792 #define selinux_nf_ip_exit()
4795 #endif /* CONFIG_NETFILTER */
4797 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4798 int selinux_disable(void)
4800 extern void exit_sel_fs(void);
4801 static int selinux_disabled
= 0;
4803 if (ss_initialized
) {
4804 /* Not permitted after initial policy load. */
4808 if (selinux_disabled
) {
4809 /* Only do this once. */
4813 printk(KERN_INFO
"SELinux: Disabled at runtime.\n");
4815 selinux_disabled
= 1;
4816 selinux_enabled
= 0;
4818 /* Reset security_ops to the secondary module, dummy or capability. */
4819 security_ops
= secondary_ops
;
4821 /* Unregister netfilter hooks. */
4822 selinux_nf_ip_exit();
4824 /* Unregister selinuxfs. */