2 * NSA Security-Enhanced Linux (SELinux) security module
4 * This file contains the SELinux hook function implementations.
6 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
7 * Chris Vance, <cvance@nai.com>
8 * Wayne Salamon, <wsalamon@nai.com>
9 * James Morris <jmorris@redhat.com>
11 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
12 * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Eric Paris <eparis@redhat.com>
14 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
15 * <dgoeddel@trustedcs.com>
16 * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P.
17 * Paul Moore <paul@paul-moore.com>
18 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
19 * Yuichi Nakamura <ynakam@hitachisoft.jp>
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License version 2,
23 * as published by the Free Software Foundation.
26 #include <linux/init.h>
28 #include <linux/kernel.h>
29 #include <linux/tracehook.h>
30 #include <linux/errno.h>
31 #include <linux/sched/signal.h>
32 #include <linux/sched/task.h>
33 #include <linux/lsm_hooks.h>
34 #include <linux/xattr.h>
35 #include <linux/capability.h>
36 #include <linux/unistd.h>
38 #include <linux/mman.h>
39 #include <linux/slab.h>
40 #include <linux/pagemap.h>
41 #include <linux/proc_fs.h>
42 #include <linux/swap.h>
43 #include <linux/spinlock.h>
44 #include <linux/syscalls.h>
45 #include <linux/dcache.h>
46 #include <linux/file.h>
47 #include <linux/fdtable.h>
48 #include <linux/namei.h>
49 #include <linux/mount.h>
50 #include <linux/netfilter_ipv4.h>
51 #include <linux/netfilter_ipv6.h>
52 #include <linux/tty.h>
54 #include <net/ip.h> /* for local_port_range[] */
55 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
56 #include <net/inet_connection_sock.h>
57 #include <net/net_namespace.h>
58 #include <net/netlabel.h>
59 #include <linux/uaccess.h>
60 #include <asm/ioctls.h>
61 #include <linux/atomic.h>
62 #include <linux/bitops.h>
63 #include <linux/interrupt.h>
64 #include <linux/netdevice.h> /* for network interface checks */
65 #include <net/netlink.h>
66 #include <linux/tcp.h>
67 #include <linux/udp.h>
68 #include <linux/dccp.h>
69 #include <linux/quota.h>
70 #include <linux/un.h> /* for Unix socket types */
71 #include <net/af_unix.h> /* for Unix socket types */
72 #include <linux/parser.h>
73 #include <linux/nfs_mount.h>
75 #include <linux/hugetlb.h>
76 #include <linux/personality.h>
77 #include <linux/audit.h>
78 #include <linux/string.h>
79 #include <linux/selinux.h>
80 #include <linux/mutex.h>
81 #include <linux/posix-timers.h>
82 #include <linux/syslog.h>
83 #include <linux/user_namespace.h>
84 #include <linux/export.h>
85 #include <linux/msg.h>
86 #include <linux/shm.h>
98 /* SECMARK reference count */
99 static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
101 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
102 int selinux_enforcing;
104 static int __init enforcing_setup(char *str)
106 unsigned long enforcing;
107 if (!kstrtoul(str, 0, &enforcing))
108 selinux_enforcing = enforcing ? 1 : 0;
111 __setup("enforcing=", enforcing_setup);
114 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
115 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
117 static int __init selinux_enabled_setup(char *str)
119 unsigned long enabled;
120 if (!kstrtoul(str, 0, &enabled))
121 selinux_enabled = enabled ? 1 : 0;
124 __setup("selinux=", selinux_enabled_setup);
126 int selinux_enabled = 1;
129 static struct kmem_cache *sel_inode_cache;
130 static struct kmem_cache *file_security_cache;
133 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
136 * This function checks the SECMARK reference counter to see if any SECMARK
137 * targets are currently configured, if the reference counter is greater than
138 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
139 * enabled, false (0) if SECMARK is disabled. If the always_check_network
140 * policy capability is enabled, SECMARK is always considered enabled.
143 static int selinux_secmark_enabled(void)
145 return (selinux_policycap_alwaysnetwork || atomic_read(&selinux_secmark_refcount));
149 * selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled
152 * This function checks if NetLabel or labeled IPSEC is enabled. Returns true
153 * (1) if any are enabled or false (0) if neither are enabled. If the
154 * always_check_network policy capability is enabled, peer labeling
155 * is always considered enabled.
158 static int selinux_peerlbl_enabled(void)
160 return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled());
163 static int selinux_netcache_avc_callback(u32 event)
165 if (event == AVC_CALLBACK_RESET) {
175 * initialise the security for the init task
177 static void cred_init_security(void)
179 struct cred *cred = (struct cred *) current->real_cred;
180 struct task_security_struct *tsec;
182 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
184 panic("SELinux: Failed to initialize initial task.\n");
186 tsec->osid = tsec->sid = SECINITSID_KERNEL;
187 cred->security = tsec;
191 * get the security ID of a set of credentials
193 static inline u32 cred_sid(const struct cred *cred)
195 const struct task_security_struct *tsec;
197 tsec = cred->security;
202 * get the objective security ID of a task
204 static inline u32 task_sid(const struct task_struct *task)
209 sid = cred_sid(__task_cred(task));
214 /* Allocate and free functions for each kind of security blob. */
216 static int inode_alloc_security(struct inode *inode)
218 struct inode_security_struct *isec;
219 u32 sid = current_sid();
221 isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
225 spin_lock_init(&isec->lock);
226 INIT_LIST_HEAD(&isec->list);
228 isec->sid = SECINITSID_UNLABELED;
229 isec->sclass = SECCLASS_FILE;
230 isec->task_sid = sid;
231 isec->initialized = LABEL_INVALID;
232 inode->i_security = isec;
237 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
240 * Try reloading inode security labels that have been marked as invalid. The
241 * @may_sleep parameter indicates when sleeping and thus reloading labels is
242 * allowed; when set to false, returns -ECHILD when the label is
243 * invalid. The @opt_dentry parameter should be set to a dentry of the inode;
244 * when no dentry is available, set it to NULL instead.
246 static int __inode_security_revalidate(struct inode *inode,
247 struct dentry *opt_dentry,
250 struct inode_security_struct *isec = inode->i_security;
252 might_sleep_if(may_sleep);
254 if (ss_initialized && isec->initialized != LABEL_INITIALIZED) {
259 * Try reloading the inode security label. This will fail if
260 * @opt_dentry is NULL and no dentry for this inode can be
261 * found; in that case, continue using the old label.
263 inode_doinit_with_dentry(inode, opt_dentry);
268 static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
270 return inode->i_security;
273 static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
277 error = __inode_security_revalidate(inode, NULL, !rcu);
279 return ERR_PTR(error);
280 return inode->i_security;
284 * Get the security label of an inode.
286 static struct inode_security_struct *inode_security(struct inode *inode)
288 __inode_security_revalidate(inode, NULL, true);
289 return inode->i_security;
292 static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
294 struct inode *inode = d_backing_inode(dentry);
296 return inode->i_security;
300 * Get the security label of a dentry's backing inode.
302 static struct inode_security_struct *backing_inode_security(struct dentry *dentry)
304 struct inode *inode = d_backing_inode(dentry);
306 __inode_security_revalidate(inode, dentry, true);
307 return inode->i_security;
310 static void inode_free_rcu(struct rcu_head *head)
312 struct inode_security_struct *isec;
314 isec = container_of(head, struct inode_security_struct, rcu);
315 kmem_cache_free(sel_inode_cache, isec);
318 static void inode_free_security(struct inode *inode)
320 struct inode_security_struct *isec = inode->i_security;
321 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
324 * As not all inode security structures are in a list, we check for
325 * empty list outside of the lock to make sure that we won't waste
326 * time taking a lock doing nothing.
328 * The list_del_init() function can be safely called more than once.
329 * It should not be possible for this function to be called with
330 * concurrent list_add(), but for better safety against future changes
331 * in the code, we use list_empty_careful() here.
333 if (!list_empty_careful(&isec->list)) {
334 spin_lock(&sbsec->isec_lock);
335 list_del_init(&isec->list);
336 spin_unlock(&sbsec->isec_lock);
340 * The inode may still be referenced in a path walk and
341 * a call to selinux_inode_permission() can be made
342 * after inode_free_security() is called. Ideally, the VFS
343 * wouldn't do this, but fixing that is a much harder
344 * job. For now, simply free the i_security via RCU, and
345 * leave the current inode->i_security pointer intact.
346 * The inode will be freed after the RCU grace period too.
348 call_rcu(&isec->rcu, inode_free_rcu);
351 static int file_alloc_security(struct file *file)
353 struct file_security_struct *fsec;
354 u32 sid = current_sid();
356 fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL);
361 fsec->fown_sid = sid;
362 file->f_security = fsec;
367 static void file_free_security(struct file *file)
369 struct file_security_struct *fsec = file->f_security;
370 file->f_security = NULL;
371 kmem_cache_free(file_security_cache, fsec);
374 static int superblock_alloc_security(struct super_block *sb)
376 struct superblock_security_struct *sbsec;
378 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
382 mutex_init(&sbsec->lock);
383 INIT_LIST_HEAD(&sbsec->isec_head);
384 spin_lock_init(&sbsec->isec_lock);
386 sbsec->sid = SECINITSID_UNLABELED;
387 sbsec->def_sid = SECINITSID_FILE;
388 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
389 sb->s_security = sbsec;
394 static void superblock_free_security(struct super_block *sb)
396 struct superblock_security_struct *sbsec = sb->s_security;
397 sb->s_security = NULL;
401 /* The file system's label must be initialized prior to use. */
403 static const char *labeling_behaviors[7] = {
405 "uses transition SIDs",
407 "uses genfs_contexts",
408 "not configured for labeling",
409 "uses mountpoint labeling",
410 "uses native labeling",
413 static inline int inode_doinit(struct inode *inode)
415 return inode_doinit_with_dentry(inode, NULL);
424 Opt_labelsupport = 5,
428 #define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1)
430 static const match_table_t tokens = {
431 {Opt_context, CONTEXT_STR "%s"},
432 {Opt_fscontext, FSCONTEXT_STR "%s"},
433 {Opt_defcontext, DEFCONTEXT_STR "%s"},
434 {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
435 {Opt_labelsupport, LABELSUPP_STR},
439 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
441 static int may_context_mount_sb_relabel(u32 sid,
442 struct superblock_security_struct *sbsec,
443 const struct cred *cred)
445 const struct task_security_struct *tsec = cred->security;
448 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
449 FILESYSTEM__RELABELFROM, NULL);
453 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
454 FILESYSTEM__RELABELTO, NULL);
458 static int may_context_mount_inode_relabel(u32 sid,
459 struct superblock_security_struct *sbsec,
460 const struct cred *cred)
462 const struct task_security_struct *tsec = cred->security;
464 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
465 FILESYSTEM__RELABELFROM, NULL);
469 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
470 FILESYSTEM__ASSOCIATE, NULL);
474 static int selinux_is_sblabel_mnt(struct super_block *sb)
476 struct superblock_security_struct *sbsec = sb->s_security;
478 return sbsec->behavior == SECURITY_FS_USE_XATTR ||
479 sbsec->behavior == SECURITY_FS_USE_TRANS ||
480 sbsec->behavior == SECURITY_FS_USE_TASK ||
481 sbsec->behavior == SECURITY_FS_USE_NATIVE ||
482 /* Special handling. Genfs but also in-core setxattr handler */
483 !strcmp(sb->s_type->name, "sysfs") ||
484 !strcmp(sb->s_type->name, "pstore") ||
485 !strcmp(sb->s_type->name, "debugfs") ||
486 !strcmp(sb->s_type->name, "tracefs") ||
487 !strcmp(sb->s_type->name, "rootfs") ||
488 (selinux_policycap_cgroupseclabel &&
489 (!strcmp(sb->s_type->name, "cgroup") ||
490 !strcmp(sb->s_type->name, "cgroup2")));
493 static int sb_finish_set_opts(struct super_block *sb)
495 struct superblock_security_struct *sbsec = sb->s_security;
496 struct dentry *root = sb->s_root;
497 struct inode *root_inode = d_backing_inode(root);
500 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
501 /* Make sure that the xattr handler exists and that no
502 error other than -ENODATA is returned by getxattr on
503 the root directory. -ENODATA is ok, as this may be
504 the first boot of the SELinux kernel before we have
505 assigned xattr values to the filesystem. */
506 if (!(root_inode->i_opflags & IOP_XATTR)) {
507 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
508 "xattr support\n", sb->s_id, sb->s_type->name);
513 rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
514 if (rc < 0 && rc != -ENODATA) {
515 if (rc == -EOPNOTSUPP)
516 printk(KERN_WARNING "SELinux: (dev %s, type "
517 "%s) has no security xattr handler\n",
518 sb->s_id, sb->s_type->name);
520 printk(KERN_WARNING "SELinux: (dev %s, type "
521 "%s) getxattr errno %d\n", sb->s_id,
522 sb->s_type->name, -rc);
527 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
528 printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
529 sb->s_id, sb->s_type->name);
531 sbsec->flags |= SE_SBINITIALIZED;
532 if (selinux_is_sblabel_mnt(sb))
533 sbsec->flags |= SBLABEL_MNT;
535 /* Initialize the root inode. */
536 rc = inode_doinit_with_dentry(root_inode, root);
538 /* Initialize any other inodes associated with the superblock, e.g.
539 inodes created prior to initial policy load or inodes created
540 during get_sb by a pseudo filesystem that directly
542 spin_lock(&sbsec->isec_lock);
544 if (!list_empty(&sbsec->isec_head)) {
545 struct inode_security_struct *isec =
546 list_entry(sbsec->isec_head.next,
547 struct inode_security_struct, list);
548 struct inode *inode = isec->inode;
549 list_del_init(&isec->list);
550 spin_unlock(&sbsec->isec_lock);
551 inode = igrab(inode);
553 if (!IS_PRIVATE(inode))
557 spin_lock(&sbsec->isec_lock);
560 spin_unlock(&sbsec->isec_lock);
566 * This function should allow an FS to ask what it's mount security
567 * options were so it can use those later for submounts, displaying
568 * mount options, or whatever.
570 static int selinux_get_mnt_opts(const struct super_block *sb,
571 struct security_mnt_opts *opts)
574 struct superblock_security_struct *sbsec = sb->s_security;
575 char *context = NULL;
579 security_init_mnt_opts(opts);
581 if (!(sbsec->flags & SE_SBINITIALIZED))
587 /* make sure we always check enough bits to cover the mask */
588 BUILD_BUG_ON(SE_MNTMASK >= (1 << NUM_SEL_MNT_OPTS));
590 tmp = sbsec->flags & SE_MNTMASK;
591 /* count the number of mount options for this sb */
592 for (i = 0; i < NUM_SEL_MNT_OPTS; i++) {
594 opts->num_mnt_opts++;
597 /* Check if the Label support flag is set */
598 if (sbsec->flags & SBLABEL_MNT)
599 opts->num_mnt_opts++;
601 opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
602 if (!opts->mnt_opts) {
607 opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
608 if (!opts->mnt_opts_flags) {
614 if (sbsec->flags & FSCONTEXT_MNT) {
615 rc = security_sid_to_context(sbsec->sid, &context, &len);
618 opts->mnt_opts[i] = context;
619 opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
621 if (sbsec->flags & CONTEXT_MNT) {
622 rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
625 opts->mnt_opts[i] = context;
626 opts->mnt_opts_flags[i++] = CONTEXT_MNT;
628 if (sbsec->flags & DEFCONTEXT_MNT) {
629 rc = security_sid_to_context(sbsec->def_sid, &context, &len);
632 opts->mnt_opts[i] = context;
633 opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
635 if (sbsec->flags & ROOTCONTEXT_MNT) {
636 struct dentry *root = sbsec->sb->s_root;
637 struct inode_security_struct *isec = backing_inode_security(root);
639 rc = security_sid_to_context(isec->sid, &context, &len);
642 opts->mnt_opts[i] = context;
643 opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
645 if (sbsec->flags & SBLABEL_MNT) {
646 opts->mnt_opts[i] = NULL;
647 opts->mnt_opts_flags[i++] = SBLABEL_MNT;
650 BUG_ON(i != opts->num_mnt_opts);
655 security_free_mnt_opts(opts);
659 static int bad_option(struct superblock_security_struct *sbsec, char flag,
660 u32 old_sid, u32 new_sid)
662 char mnt_flags = sbsec->flags & SE_MNTMASK;
664 /* check if the old mount command had the same options */
665 if (sbsec->flags & SE_SBINITIALIZED)
666 if (!(sbsec->flags & flag) ||
667 (old_sid != new_sid))
670 /* check if we were passed the same options twice,
671 * aka someone passed context=a,context=b
673 if (!(sbsec->flags & SE_SBINITIALIZED))
674 if (mnt_flags & flag)
680 * Allow filesystems with binary mount data to explicitly set mount point
681 * labeling information.
683 static int selinux_set_mnt_opts(struct super_block *sb,
684 struct security_mnt_opts *opts,
685 unsigned long kern_flags,
686 unsigned long *set_kern_flags)
688 const struct cred *cred = current_cred();
690 struct superblock_security_struct *sbsec = sb->s_security;
691 const char *name = sb->s_type->name;
692 struct dentry *root = sbsec->sb->s_root;
693 struct inode_security_struct *root_isec;
694 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
695 u32 defcontext_sid = 0;
696 char **mount_options = opts->mnt_opts;
697 int *flags = opts->mnt_opts_flags;
698 int num_opts = opts->num_mnt_opts;
700 mutex_lock(&sbsec->lock);
702 if (!ss_initialized) {
704 /* Defer initialization until selinux_complete_init,
705 after the initial policy is loaded and the security
706 server is ready to handle calls. */
710 printk(KERN_WARNING "SELinux: Unable to set superblock options "
711 "before the security server is initialized\n");
714 if (kern_flags && !set_kern_flags) {
715 /* Specifying internal flags without providing a place to
716 * place the results is not allowed */
722 * Binary mount data FS will come through this function twice. Once
723 * from an explicit call and once from the generic calls from the vfs.
724 * Since the generic VFS calls will not contain any security mount data
725 * we need to skip the double mount verification.
727 * This does open a hole in which we will not notice if the first
728 * mount using this sb set explict options and a second mount using
729 * this sb does not set any security options. (The first options
730 * will be used for both mounts)
732 if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
736 root_isec = backing_inode_security_novalidate(root);
739 * parse the mount options, check if they are valid sids.
740 * also check if someone is trying to mount the same sb more
741 * than once with different security options.
743 for (i = 0; i < num_opts; i++) {
746 if (flags[i] == SBLABEL_MNT)
748 rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL);
750 printk(KERN_WARNING "SELinux: security_context_str_to_sid"
751 "(%s) failed for (dev %s, type %s) errno=%d\n",
752 mount_options[i], sb->s_id, name, rc);
759 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
761 goto out_double_mount;
763 sbsec->flags |= FSCONTEXT_MNT;
768 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
770 goto out_double_mount;
772 sbsec->flags |= CONTEXT_MNT;
774 case ROOTCONTEXT_MNT:
775 rootcontext_sid = sid;
777 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
779 goto out_double_mount;
781 sbsec->flags |= ROOTCONTEXT_MNT;
785 defcontext_sid = sid;
787 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
789 goto out_double_mount;
791 sbsec->flags |= DEFCONTEXT_MNT;
800 if (sbsec->flags & SE_SBINITIALIZED) {
801 /* previously mounted with options, but not on this attempt? */
802 if ((sbsec->flags & SE_MNTMASK) && !num_opts)
803 goto out_double_mount;
808 if (strcmp(sb->s_type->name, "proc") == 0)
809 sbsec->flags |= SE_SBPROC | SE_SBGENFS;
811 if (!strcmp(sb->s_type->name, "debugfs") ||
812 !strcmp(sb->s_type->name, "sysfs") ||
813 !strcmp(sb->s_type->name, "pstore"))
814 sbsec->flags |= SE_SBGENFS;
816 if (!sbsec->behavior) {
818 * Determine the labeling behavior to use for this
821 rc = security_fs_use(sb);
824 "%s: security_fs_use(%s) returned %d\n",
825 __func__, sb->s_type->name, rc);
831 * If this is a user namespace mount and the filesystem type is not
832 * explicitly whitelisted, then no contexts are allowed on the command
833 * line and security labels must be ignored.
835 if (sb->s_user_ns != &init_user_ns &&
836 strcmp(sb->s_type->name, "tmpfs") &&
837 strcmp(sb->s_type->name, "ramfs") &&
838 strcmp(sb->s_type->name, "devpts")) {
839 if (context_sid || fscontext_sid || rootcontext_sid ||
844 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
845 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
846 rc = security_transition_sid(current_sid(), current_sid(),
848 &sbsec->mntpoint_sid);
855 /* sets the context of the superblock for the fs being mounted. */
857 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
861 sbsec->sid = fscontext_sid;
865 * Switch to using mount point labeling behavior.
866 * sets the label used on all file below the mountpoint, and will set
867 * the superblock context if not already set.
869 if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) {
870 sbsec->behavior = SECURITY_FS_USE_NATIVE;
871 *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
875 if (!fscontext_sid) {
876 rc = may_context_mount_sb_relabel(context_sid, sbsec,
880 sbsec->sid = context_sid;
882 rc = may_context_mount_inode_relabel(context_sid, sbsec,
887 if (!rootcontext_sid)
888 rootcontext_sid = context_sid;
890 sbsec->mntpoint_sid = context_sid;
891 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
894 if (rootcontext_sid) {
895 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
900 root_isec->sid = rootcontext_sid;
901 root_isec->initialized = LABEL_INITIALIZED;
904 if (defcontext_sid) {
905 if (sbsec->behavior != SECURITY_FS_USE_XATTR &&
906 sbsec->behavior != SECURITY_FS_USE_NATIVE) {
908 printk(KERN_WARNING "SELinux: defcontext option is "
909 "invalid for this filesystem type\n");
913 if (defcontext_sid != sbsec->def_sid) {
914 rc = may_context_mount_inode_relabel(defcontext_sid,
920 sbsec->def_sid = defcontext_sid;
924 rc = sb_finish_set_opts(sb);
926 mutex_unlock(&sbsec->lock);
930 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
931 "security settings for (dev %s, type %s)\n", sb->s_id, name);
935 static int selinux_cmp_sb_context(const struct super_block *oldsb,
936 const struct super_block *newsb)
938 struct superblock_security_struct *old = oldsb->s_security;
939 struct superblock_security_struct *new = newsb->s_security;
940 char oldflags = old->flags & SE_MNTMASK;
941 char newflags = new->flags & SE_MNTMASK;
943 if (oldflags != newflags)
945 if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid)
947 if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid)
949 if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid)
951 if (oldflags & ROOTCONTEXT_MNT) {
952 struct inode_security_struct *oldroot = backing_inode_security(oldsb->s_root);
953 struct inode_security_struct *newroot = backing_inode_security(newsb->s_root);
954 if (oldroot->sid != newroot->sid)
959 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, "
960 "different security settings for (dev %s, "
961 "type %s)\n", newsb->s_id, newsb->s_type->name);
965 static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
966 struct super_block *newsb)
968 const struct superblock_security_struct *oldsbsec = oldsb->s_security;
969 struct superblock_security_struct *newsbsec = newsb->s_security;
971 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
972 int set_context = (oldsbsec->flags & CONTEXT_MNT);
973 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
976 * if the parent was able to be mounted it clearly had no special lsm
977 * mount options. thus we can safely deal with this superblock later
982 /* how can we clone if the old one wasn't set up?? */
983 BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
985 /* if fs is reusing a sb, make sure that the contexts match */
986 if (newsbsec->flags & SE_SBINITIALIZED)
987 return selinux_cmp_sb_context(oldsb, newsb);
989 mutex_lock(&newsbsec->lock);
991 newsbsec->flags = oldsbsec->flags;
993 newsbsec->sid = oldsbsec->sid;
994 newsbsec->def_sid = oldsbsec->def_sid;
995 newsbsec->behavior = oldsbsec->behavior;
998 u32 sid = oldsbsec->mntpoint_sid;
1001 newsbsec->sid = sid;
1002 if (!set_rootcontext) {
1003 struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
1006 newsbsec->mntpoint_sid = sid;
1008 if (set_rootcontext) {
1009 const struct inode_security_struct *oldisec = backing_inode_security(oldsb->s_root);
1010 struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
1012 newisec->sid = oldisec->sid;
1015 sb_finish_set_opts(newsb);
1016 mutex_unlock(&newsbsec->lock);
1020 static int selinux_parse_opts_str(char *options,
1021 struct security_mnt_opts *opts)
1024 char *context = NULL, *defcontext = NULL;
1025 char *fscontext = NULL, *rootcontext = NULL;
1026 int rc, num_mnt_opts = 0;
1028 opts->num_mnt_opts = 0;
1030 /* Standard string-based options. */
1031 while ((p = strsep(&options, "|")) != NULL) {
1033 substring_t args[MAX_OPT_ARGS];
1038 token = match_token(p, tokens, args);
1042 if (context || defcontext) {
1044 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
1047 context = match_strdup(&args[0]);
1057 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
1060 fscontext = match_strdup(&args[0]);
1067 case Opt_rootcontext:
1070 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
1073 rootcontext = match_strdup(&args[0]);
1080 case Opt_defcontext:
1081 if (context || defcontext) {
1083 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
1086 defcontext = match_strdup(&args[0]);
1092 case Opt_labelsupport:
1096 printk(KERN_WARNING "SELinux: unknown mount option\n");
1103 opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_KERNEL);
1104 if (!opts->mnt_opts)
1107 opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int),
1109 if (!opts->mnt_opts_flags) {
1110 kfree(opts->mnt_opts);
1115 opts->mnt_opts[num_mnt_opts] = fscontext;
1116 opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
1119 opts->mnt_opts[num_mnt_opts] = context;
1120 opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
1123 opts->mnt_opts[num_mnt_opts] = rootcontext;
1124 opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
1127 opts->mnt_opts[num_mnt_opts] = defcontext;
1128 opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
1131 opts->num_mnt_opts = num_mnt_opts;
1142 * string mount options parsing and call set the sbsec
1144 static int superblock_doinit(struct super_block *sb, void *data)
1147 char *options = data;
1148 struct security_mnt_opts opts;
1150 security_init_mnt_opts(&opts);
1155 BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
1157 rc = selinux_parse_opts_str(options, &opts);
1162 rc = selinux_set_mnt_opts(sb, &opts, 0, NULL);
1165 security_free_mnt_opts(&opts);
1169 static void selinux_write_opts(struct seq_file *m,
1170 struct security_mnt_opts *opts)
1175 for (i = 0; i < opts->num_mnt_opts; i++) {
1178 if (opts->mnt_opts[i])
1179 has_comma = strchr(opts->mnt_opts[i], ',');
1183 switch (opts->mnt_opts_flags[i]) {
1185 prefix = CONTEXT_STR;
1188 prefix = FSCONTEXT_STR;
1190 case ROOTCONTEXT_MNT:
1191 prefix = ROOTCONTEXT_STR;
1193 case DEFCONTEXT_MNT:
1194 prefix = DEFCONTEXT_STR;
1198 seq_puts(m, LABELSUPP_STR);
1204 /* we need a comma before each option */
1206 seq_puts(m, prefix);
1209 seq_escape(m, opts->mnt_opts[i], "\"\n\\");
1215 static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
1217 struct security_mnt_opts opts;
1220 rc = selinux_get_mnt_opts(sb, &opts);
1222 /* before policy load we may get EINVAL, don't show anything */
1228 selinux_write_opts(m, &opts);
1230 security_free_mnt_opts(&opts);
1235 static inline u16 inode_mode_to_security_class(umode_t mode)
1237 switch (mode & S_IFMT) {
1239 return SECCLASS_SOCK_FILE;
1241 return SECCLASS_LNK_FILE;
1243 return SECCLASS_FILE;
1245 return SECCLASS_BLK_FILE;
1247 return SECCLASS_DIR;
1249 return SECCLASS_CHR_FILE;
1251 return SECCLASS_FIFO_FILE;
1255 return SECCLASS_FILE;
1258 static inline int default_protocol_stream(int protocol)
1260 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
1263 static inline int default_protocol_dgram(int protocol)
1265 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1268 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1270 int extsockclass = selinux_policycap_extsockclass;
1276 case SOCK_SEQPACKET:
1277 return SECCLASS_UNIX_STREAM_SOCKET;
1279 return SECCLASS_UNIX_DGRAM_SOCKET;
1286 case SOCK_SEQPACKET:
1287 if (default_protocol_stream(protocol))
1288 return SECCLASS_TCP_SOCKET;
1289 else if (extsockclass && protocol == IPPROTO_SCTP)
1290 return SECCLASS_SCTP_SOCKET;
1292 return SECCLASS_RAWIP_SOCKET;
1294 if (default_protocol_dgram(protocol))
1295 return SECCLASS_UDP_SOCKET;
1296 else if (extsockclass && (protocol == IPPROTO_ICMP ||
1297 protocol == IPPROTO_ICMPV6))
1298 return SECCLASS_ICMP_SOCKET;
1300 return SECCLASS_RAWIP_SOCKET;
1302 return SECCLASS_DCCP_SOCKET;
1304 return SECCLASS_RAWIP_SOCKET;
1310 return SECCLASS_NETLINK_ROUTE_SOCKET;
1311 case NETLINK_SOCK_DIAG:
1312 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1314 return SECCLASS_NETLINK_NFLOG_SOCKET;
1316 return SECCLASS_NETLINK_XFRM_SOCKET;
1317 case NETLINK_SELINUX:
1318 return SECCLASS_NETLINK_SELINUX_SOCKET;
1320 return SECCLASS_NETLINK_ISCSI_SOCKET;
1322 return SECCLASS_NETLINK_AUDIT_SOCKET;
1323 case NETLINK_FIB_LOOKUP:
1324 return SECCLASS_NETLINK_FIB_LOOKUP_SOCKET;
1325 case NETLINK_CONNECTOR:
1326 return SECCLASS_NETLINK_CONNECTOR_SOCKET;
1327 case NETLINK_NETFILTER:
1328 return SECCLASS_NETLINK_NETFILTER_SOCKET;
1329 case NETLINK_DNRTMSG:
1330 return SECCLASS_NETLINK_DNRT_SOCKET;
1331 case NETLINK_KOBJECT_UEVENT:
1332 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
1333 case NETLINK_GENERIC:
1334 return SECCLASS_NETLINK_GENERIC_SOCKET;
1335 case NETLINK_SCSITRANSPORT:
1336 return SECCLASS_NETLINK_SCSITRANSPORT_SOCKET;
1338 return SECCLASS_NETLINK_RDMA_SOCKET;
1339 case NETLINK_CRYPTO:
1340 return SECCLASS_NETLINK_CRYPTO_SOCKET;
1342 return SECCLASS_NETLINK_SOCKET;
1345 return SECCLASS_PACKET_SOCKET;
1347 return SECCLASS_KEY_SOCKET;
1349 return SECCLASS_APPLETALK_SOCKET;
1355 return SECCLASS_AX25_SOCKET;
1357 return SECCLASS_IPX_SOCKET;
1359 return SECCLASS_NETROM_SOCKET;
1361 return SECCLASS_ATMPVC_SOCKET;
1363 return SECCLASS_X25_SOCKET;
1365 return SECCLASS_ROSE_SOCKET;
1367 return SECCLASS_DECNET_SOCKET;
1369 return SECCLASS_ATMSVC_SOCKET;
1371 return SECCLASS_RDS_SOCKET;
1373 return SECCLASS_IRDA_SOCKET;
1375 return SECCLASS_PPPOX_SOCKET;
1377 return SECCLASS_LLC_SOCKET;
1379 return SECCLASS_CAN_SOCKET;
1381 return SECCLASS_TIPC_SOCKET;
1383 return SECCLASS_BLUETOOTH_SOCKET;
1385 return SECCLASS_IUCV_SOCKET;
1387 return SECCLASS_RXRPC_SOCKET;
1389 return SECCLASS_ISDN_SOCKET;
1391 return SECCLASS_PHONET_SOCKET;
1393 return SECCLASS_IEEE802154_SOCKET;
1395 return SECCLASS_CAIF_SOCKET;
1397 return SECCLASS_ALG_SOCKET;
1399 return SECCLASS_NFC_SOCKET;
1401 return SECCLASS_VSOCK_SOCKET;
1403 return SECCLASS_KCM_SOCKET;
1405 return SECCLASS_QIPCRTR_SOCKET;
1407 return SECCLASS_SMC_SOCKET;
1409 #error New address family defined, please update this function.
1414 return SECCLASS_SOCKET;
1417 static int selinux_genfs_get_sid(struct dentry *dentry,
1423 struct super_block *sb = dentry->d_sb;
1424 char *buffer, *path;
1426 buffer = (char *)__get_free_page(GFP_KERNEL);
1430 path = dentry_path_raw(dentry, buffer, PAGE_SIZE);
1434 if (flags & SE_SBPROC) {
1435 /* each process gets a /proc/PID/ entry. Strip off the
1436 * PID part to get a valid selinux labeling.
1437 * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */
1438 while (path[1] >= '0' && path[1] <= '9') {
1443 rc = security_genfs_sid(sb->s_type->name, path, tclass, sid);
1445 free_page((unsigned long)buffer);
1449 /* The inode's security attributes must be initialized before first use. */
1450 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1452 struct superblock_security_struct *sbsec = NULL;
1453 struct inode_security_struct *isec = inode->i_security;
1454 u32 task_sid, sid = 0;
1456 struct dentry *dentry;
1457 #define INITCONTEXTLEN 255
1458 char *context = NULL;
1462 if (isec->initialized == LABEL_INITIALIZED)
1465 spin_lock(&isec->lock);
1466 if (isec->initialized == LABEL_INITIALIZED)
1469 if (isec->sclass == SECCLASS_FILE)
1470 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1472 sbsec = inode->i_sb->s_security;
1473 if (!(sbsec->flags & SE_SBINITIALIZED)) {
1474 /* Defer initialization until selinux_complete_init,
1475 after the initial policy is loaded and the security
1476 server is ready to handle calls. */
1477 spin_lock(&sbsec->isec_lock);
1478 if (list_empty(&isec->list))
1479 list_add(&isec->list, &sbsec->isec_head);
1480 spin_unlock(&sbsec->isec_lock);
1484 sclass = isec->sclass;
1485 task_sid = isec->task_sid;
1487 isec->initialized = LABEL_PENDING;
1488 spin_unlock(&isec->lock);
1490 switch (sbsec->behavior) {
1491 case SECURITY_FS_USE_NATIVE:
1493 case SECURITY_FS_USE_XATTR:
1494 if (!(inode->i_opflags & IOP_XATTR)) {
1495 sid = sbsec->def_sid;
1498 /* Need a dentry, since the xattr API requires one.
1499 Life would be simpler if we could just pass the inode. */
1501 /* Called from d_instantiate or d_splice_alias. */
1502 dentry = dget(opt_dentry);
1504 /* Called from selinux_complete_init, try to find a dentry. */
1505 dentry = d_find_alias(inode);
1509 * this is can be hit on boot when a file is accessed
1510 * before the policy is loaded. When we load policy we
1511 * may find inodes that have no dentry on the
1512 * sbsec->isec_head list. No reason to complain as these
1513 * will get fixed up the next time we go through
1514 * inode_doinit with a dentry, before these inodes could
1515 * be used again by userspace.
1520 len = INITCONTEXTLEN;
1521 context = kmalloc(len+1, GFP_NOFS);
1527 context[len] = '\0';
1528 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
1529 if (rc == -ERANGE) {
1532 /* Need a larger buffer. Query for the right size. */
1533 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, NULL, 0);
1539 context = kmalloc(len+1, GFP_NOFS);
1545 context[len] = '\0';
1546 rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
1550 if (rc != -ENODATA) {
1551 printk(KERN_WARNING "SELinux: %s: getxattr returned "
1552 "%d for dev=%s ino=%ld\n", __func__,
1553 -rc, inode->i_sb->s_id, inode->i_ino);
1557 /* Map ENODATA to the default file SID */
1558 sid = sbsec->def_sid;
1561 rc = security_context_to_sid_default(context, rc, &sid,
1565 char *dev = inode->i_sb->s_id;
1566 unsigned long ino = inode->i_ino;
1568 if (rc == -EINVAL) {
1569 if (printk_ratelimit())
1570 printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid "
1571 "context=%s. This indicates you may need to relabel the inode or the "
1572 "filesystem in question.\n", ino, dev, context);
1574 printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) "
1575 "returned %d for dev=%s ino=%ld\n",
1576 __func__, context, -rc, dev, ino);
1579 /* Leave with the unlabeled SID */
1586 case SECURITY_FS_USE_TASK:
1589 case SECURITY_FS_USE_TRANS:
1590 /* Default to the fs SID. */
1593 /* Try to obtain a transition SID. */
1594 rc = security_transition_sid(task_sid, sid, sclass, NULL, &sid);
1598 case SECURITY_FS_USE_MNTPOINT:
1599 sid = sbsec->mntpoint_sid;
1602 /* Default to the fs superblock SID. */
1605 if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) {
1606 /* We must have a dentry to determine the label on
1609 /* Called from d_instantiate or
1610 * d_splice_alias. */
1611 dentry = dget(opt_dentry);
1613 /* Called from selinux_complete_init, try to
1615 dentry = d_find_alias(inode);
1617 * This can be hit on boot when a file is accessed
1618 * before the policy is loaded. When we load policy we
1619 * may find inodes that have no dentry on the
1620 * sbsec->isec_head list. No reason to complain as
1621 * these will get fixed up the next time we go through
1622 * inode_doinit() with a dentry, before these inodes
1623 * could be used again by userspace.
1627 rc = selinux_genfs_get_sid(dentry, sclass,
1628 sbsec->flags, &sid);
1637 spin_lock(&isec->lock);
1638 if (isec->initialized == LABEL_PENDING) {
1640 isec->initialized = LABEL_INVALID;
1644 isec->initialized = LABEL_INITIALIZED;
1649 spin_unlock(&isec->lock);
1653 /* Convert a Linux signal to an access vector. */
1654 static inline u32 signal_to_av(int sig)
1660 /* Commonly granted from child to parent. */
1661 perm = PROCESS__SIGCHLD;
1664 /* Cannot be caught or ignored */
1665 perm = PROCESS__SIGKILL;
1668 /* Cannot be caught or ignored */
1669 perm = PROCESS__SIGSTOP;
1672 /* All other signals. */
1673 perm = PROCESS__SIGNAL;
1680 #if CAP_LAST_CAP > 63
1681 #error Fix SELinux to handle capabilities > 63.
1684 /* Check whether a task is allowed to use a capability. */
1685 static int cred_has_capability(const struct cred *cred,
1686 int cap, int audit, bool initns)
1688 struct common_audit_data ad;
1689 struct av_decision avd;
1691 u32 sid = cred_sid(cred);
1692 u32 av = CAP_TO_MASK(cap);
1695 ad.type = LSM_AUDIT_DATA_CAP;
1698 switch (CAP_TO_INDEX(cap)) {
1700 sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
1703 sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
1707 "SELinux: out of range capability %d\n", cap);
1712 rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
1713 if (audit == SECURITY_CAP_AUDIT) {
1714 int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad, 0);
1721 /* Check whether a task has a particular permission to an inode.
1722 The 'adp' parameter is optional and allows other audit
1723 data to be passed (e.g. the dentry). */
1724 static int inode_has_perm(const struct cred *cred,
1725 struct inode *inode,
1727 struct common_audit_data *adp)
1729 struct inode_security_struct *isec;
1732 validate_creds(cred);
1734 if (unlikely(IS_PRIVATE(inode)))
1737 sid = cred_sid(cred);
1738 isec = inode->i_security;
1740 return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
1743 /* Same as inode_has_perm, but pass explicit audit data containing
1744 the dentry to help the auditing code to more easily generate the
1745 pathname if needed. */
1746 static inline int dentry_has_perm(const struct cred *cred,
1747 struct dentry *dentry,
1750 struct inode *inode = d_backing_inode(dentry);
1751 struct common_audit_data ad;
1753 ad.type = LSM_AUDIT_DATA_DENTRY;
1754 ad.u.dentry = dentry;
1755 __inode_security_revalidate(inode, dentry, true);
1756 return inode_has_perm(cred, inode, av, &ad);
1759 /* Same as inode_has_perm, but pass explicit audit data containing
1760 the path to help the auditing code to more easily generate the
1761 pathname if needed. */
1762 static inline int path_has_perm(const struct cred *cred,
1763 const struct path *path,
1766 struct inode *inode = d_backing_inode(path->dentry);
1767 struct common_audit_data ad;
1769 ad.type = LSM_AUDIT_DATA_PATH;
1771 __inode_security_revalidate(inode, path->dentry, true);
1772 return inode_has_perm(cred, inode, av, &ad);
1775 /* Same as path_has_perm, but uses the inode from the file struct. */
1776 static inline int file_path_has_perm(const struct cred *cred,
1780 struct common_audit_data ad;
1782 ad.type = LSM_AUDIT_DATA_FILE;
1784 return inode_has_perm(cred, file_inode(file), av, &ad);
1787 /* Check whether a task can use an open file descriptor to
1788 access an inode in a given way. Check access to the
1789 descriptor itself, and then use dentry_has_perm to
1790 check a particular permission to the file.
1791 Access to the descriptor is implicitly granted if it
1792 has the same SID as the process. If av is zero, then
1793 access to the file is not checked, e.g. for cases
1794 where only the descriptor is affected like seek. */
1795 static int file_has_perm(const struct cred *cred,
1799 struct file_security_struct *fsec = file->f_security;
1800 struct inode *inode = file_inode(file);
1801 struct common_audit_data ad;
1802 u32 sid = cred_sid(cred);
1805 ad.type = LSM_AUDIT_DATA_FILE;
1808 if (sid != fsec->sid) {
1809 rc = avc_has_perm(sid, fsec->sid,
1817 /* av is zero if only checking access to the descriptor. */
1820 rc = inode_has_perm(cred, inode, av, &ad);
1827 * Determine the label for an inode that might be unioned.
1830 selinux_determine_inode_label(const struct task_security_struct *tsec,
1832 const struct qstr *name, u16 tclass,
1835 const struct superblock_security_struct *sbsec = dir->i_sb->s_security;
1837 if ((sbsec->flags & SE_SBINITIALIZED) &&
1838 (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) {
1839 *_new_isid = sbsec->mntpoint_sid;
1840 } else if ((sbsec->flags & SBLABEL_MNT) &&
1842 *_new_isid = tsec->create_sid;
1844 const struct inode_security_struct *dsec = inode_security(dir);
1845 return security_transition_sid(tsec->sid, dsec->sid, tclass,
1852 /* Check whether a task can create a file. */
1853 static int may_create(struct inode *dir,
1854 struct dentry *dentry,
1857 const struct task_security_struct *tsec = current_security();
1858 struct inode_security_struct *dsec;
1859 struct superblock_security_struct *sbsec;
1861 struct common_audit_data ad;
1864 dsec = inode_security(dir);
1865 sbsec = dir->i_sb->s_security;
1869 ad.type = LSM_AUDIT_DATA_DENTRY;
1870 ad.u.dentry = dentry;
1872 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
1873 DIR__ADD_NAME | DIR__SEARCH,
1878 rc = selinux_determine_inode_label(current_security(), dir,
1879 &dentry->d_name, tclass, &newsid);
1883 rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
1887 return avc_has_perm(newsid, sbsec->sid,
1888 SECCLASS_FILESYSTEM,
1889 FILESYSTEM__ASSOCIATE, &ad);
1893 #define MAY_UNLINK 1
1896 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1897 static int may_link(struct inode *dir,
1898 struct dentry *dentry,
1902 struct inode_security_struct *dsec, *isec;
1903 struct common_audit_data ad;
1904 u32 sid = current_sid();
1908 dsec = inode_security(dir);
1909 isec = backing_inode_security(dentry);
1911 ad.type = LSM_AUDIT_DATA_DENTRY;
1912 ad.u.dentry = dentry;
1915 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1916 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
1931 printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n",
1936 rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
1940 static inline int may_rename(struct inode *old_dir,
1941 struct dentry *old_dentry,
1942 struct inode *new_dir,
1943 struct dentry *new_dentry)
1945 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1946 struct common_audit_data ad;
1947 u32 sid = current_sid();
1949 int old_is_dir, new_is_dir;
1952 old_dsec = inode_security(old_dir);
1953 old_isec = backing_inode_security(old_dentry);
1954 old_is_dir = d_is_dir(old_dentry);
1955 new_dsec = inode_security(new_dir);
1957 ad.type = LSM_AUDIT_DATA_DENTRY;
1959 ad.u.dentry = old_dentry;
1960 rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
1961 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1964 rc = avc_has_perm(sid, old_isec->sid,
1965 old_isec->sclass, FILE__RENAME, &ad);
1968 if (old_is_dir && new_dir != old_dir) {
1969 rc = avc_has_perm(sid, old_isec->sid,
1970 old_isec->sclass, DIR__REPARENT, &ad);
1975 ad.u.dentry = new_dentry;
1976 av = DIR__ADD_NAME | DIR__SEARCH;
1977 if (d_is_positive(new_dentry))
1978 av |= DIR__REMOVE_NAME;
1979 rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1982 if (d_is_positive(new_dentry)) {
1983 new_isec = backing_inode_security(new_dentry);
1984 new_is_dir = d_is_dir(new_dentry);
1985 rc = avc_has_perm(sid, new_isec->sid,
1987 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1995 /* Check whether a task can perform a filesystem operation. */
1996 static int superblock_has_perm(const struct cred *cred,
1997 struct super_block *sb,
1999 struct common_audit_data *ad)
2001 struct superblock_security_struct *sbsec;
2002 u32 sid = cred_sid(cred);
2004 sbsec = sb->s_security;
2005 return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
2008 /* Convert a Linux mode and permission mask to an access vector. */
2009 static inline u32 file_mask_to_av(int mode, int mask)
2013 if (!S_ISDIR(mode)) {
2014 if (mask & MAY_EXEC)
2015 av |= FILE__EXECUTE;
2016 if (mask & MAY_READ)
2019 if (mask & MAY_APPEND)
2021 else if (mask & MAY_WRITE)
2025 if (mask & MAY_EXEC)
2027 if (mask & MAY_WRITE)
2029 if (mask & MAY_READ)
2036 /* Convert a Linux file to an access vector. */
2037 static inline u32 file_to_av(struct file *file)
2041 if (file->f_mode & FMODE_READ)
2043 if (file->f_mode & FMODE_WRITE) {
2044 if (file->f_flags & O_APPEND)
2051 * Special file opened with flags 3 for ioctl-only use.
2060 * Convert a file to an access vector and include the correct open
2063 static inline u32 open_file_to_av(struct file *file)
2065 u32 av = file_to_av(file);
2067 if (selinux_policycap_openperm)
2073 /* Hook functions begin here. */
2075 static int selinux_binder_set_context_mgr(struct task_struct *mgr)
2077 u32 mysid = current_sid();
2078 u32 mgrsid = task_sid(mgr);
2080 return avc_has_perm(mysid, mgrsid, SECCLASS_BINDER,
2081 BINDER__SET_CONTEXT_MGR, NULL);
2084 static int selinux_binder_transaction(struct task_struct *from,
2085 struct task_struct *to)
2087 u32 mysid = current_sid();
2088 u32 fromsid = task_sid(from);
2089 u32 tosid = task_sid(to);
2092 if (mysid != fromsid) {
2093 rc = avc_has_perm(mysid, fromsid, SECCLASS_BINDER,
2094 BINDER__IMPERSONATE, NULL);
2099 return avc_has_perm(fromsid, tosid, SECCLASS_BINDER, BINDER__CALL,
2103 static int selinux_binder_transfer_binder(struct task_struct *from,
2104 struct task_struct *to)
2106 u32 fromsid = task_sid(from);
2107 u32 tosid = task_sid(to);
2109 return avc_has_perm(fromsid, tosid, SECCLASS_BINDER, BINDER__TRANSFER,
2113 static int selinux_binder_transfer_file(struct task_struct *from,
2114 struct task_struct *to,
2117 u32 sid = task_sid(to);
2118 struct file_security_struct *fsec = file->f_security;
2119 struct dentry *dentry = file->f_path.dentry;
2120 struct inode_security_struct *isec;
2121 struct common_audit_data ad;
2124 ad.type = LSM_AUDIT_DATA_PATH;
2125 ad.u.path = file->f_path;
2127 if (sid != fsec->sid) {
2128 rc = avc_has_perm(sid, fsec->sid,
2136 if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
2139 isec = backing_inode_security(dentry);
2140 return avc_has_perm(sid, isec->sid, isec->sclass, file_to_av(file),
2144 static int selinux_ptrace_access_check(struct task_struct *child,
2147 u32 sid = current_sid();
2148 u32 csid = task_sid(child);
2150 if (mode & PTRACE_MODE_READ)
2151 return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
2153 return avc_has_perm(sid, csid, SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
2156 static int selinux_ptrace_traceme(struct task_struct *parent)
2158 return avc_has_perm(task_sid(parent), current_sid(), SECCLASS_PROCESS,
2159 PROCESS__PTRACE, NULL);
2162 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
2163 kernel_cap_t *inheritable, kernel_cap_t *permitted)
2165 return avc_has_perm(current_sid(), task_sid(target), SECCLASS_PROCESS,
2166 PROCESS__GETCAP, NULL);
2169 static int selinux_capset(struct cred *new, const struct cred *old,
2170 const kernel_cap_t *effective,
2171 const kernel_cap_t *inheritable,
2172 const kernel_cap_t *permitted)
2174 return avc_has_perm(cred_sid(old), cred_sid(new), SECCLASS_PROCESS,
2175 PROCESS__SETCAP, NULL);
2179 * (This comment used to live with the selinux_task_setuid hook,
2180 * which was removed).
2182 * Since setuid only affects the current process, and since the SELinux
2183 * controls are not based on the Linux identity attributes, SELinux does not
2184 * need to control this operation. However, SELinux does control the use of
2185 * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
2188 static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
2191 return cred_has_capability(cred, cap, audit, ns == &init_user_ns);
2194 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
2196 const struct cred *cred = current_cred();
2208 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
2213 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
2216 rc = 0; /* let the kernel handle invalid cmds */
2222 static int selinux_quota_on(struct dentry *dentry)
2224 const struct cred *cred = current_cred();
2226 return dentry_has_perm(cred, dentry, FILE__QUOTAON);
2229 static int selinux_syslog(int type)
2232 case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */
2233 case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */
2234 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2235 SECCLASS_SYSTEM, SYSTEM__SYSLOG_READ, NULL);
2236 case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */
2237 case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */
2238 /* Set level of messages printed to console */
2239 case SYSLOG_ACTION_CONSOLE_LEVEL:
2240 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2241 SECCLASS_SYSTEM, SYSTEM__SYSLOG_CONSOLE,
2244 /* All other syslog types */
2245 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
2246 SECCLASS_SYSTEM, SYSTEM__SYSLOG_MOD, NULL);
2250 * Check that a process has enough memory to allocate a new virtual
2251 * mapping. 0 means there is enough memory for the allocation to
2252 * succeed and -ENOMEM implies there is not.
2254 * Do not audit the selinux permission check, as this is applied to all
2255 * processes that allocate mappings.
2257 static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
2259 int rc, cap_sys_admin = 0;
2261 rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
2262 SECURITY_CAP_NOAUDIT, true);
2266 return cap_sys_admin;
2269 /* binprm security operations */
2271 static u32 ptrace_parent_sid(void)
2274 struct task_struct *tracer;
2277 tracer = ptrace_parent(current);
2279 sid = task_sid(tracer);
2285 static int check_nnp_nosuid(const struct linux_binprm *bprm,
2286 const struct task_security_struct *old_tsec,
2287 const struct task_security_struct *new_tsec)
2289 int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
2290 int nosuid = !mnt_may_suid(bprm->file->f_path.mnt);
2293 if (!nnp && !nosuid)
2294 return 0; /* neither NNP nor nosuid */
2296 if (new_tsec->sid == old_tsec->sid)
2297 return 0; /* No change in credentials */
2300 * The only transitions we permit under NNP or nosuid
2301 * are transitions to bounded SIDs, i.e. SIDs that are
2302 * guaranteed to only be allowed a subset of the permissions
2303 * of the current SID.
2305 rc = security_bounded_transition(old_tsec->sid, new_tsec->sid);
2308 * On failure, preserve the errno values for NNP vs nosuid.
2309 * NNP: Operation not permitted for caller.
2310 * nosuid: Permission denied to file.
2320 static int selinux_bprm_set_creds(struct linux_binprm *bprm)
2322 const struct task_security_struct *old_tsec;
2323 struct task_security_struct *new_tsec;
2324 struct inode_security_struct *isec;
2325 struct common_audit_data ad;
2326 struct inode *inode = file_inode(bprm->file);
2329 /* SELinux context only depends on initial program or script and not
2330 * the script interpreter */
2331 if (bprm->cred_prepared)
2334 old_tsec = current_security();
2335 new_tsec = bprm->cred->security;
2336 isec = inode_security(inode);
2338 /* Default to the current task SID. */
2339 new_tsec->sid = old_tsec->sid;
2340 new_tsec->osid = old_tsec->sid;
2342 /* Reset fs, key, and sock SIDs on execve. */
2343 new_tsec->create_sid = 0;
2344 new_tsec->keycreate_sid = 0;
2345 new_tsec->sockcreate_sid = 0;
2347 if (old_tsec->exec_sid) {
2348 new_tsec->sid = old_tsec->exec_sid;
2349 /* Reset exec SID on execve. */
2350 new_tsec->exec_sid = 0;
2352 /* Fail on NNP or nosuid if not an allowed transition. */
2353 rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
2357 /* Check for a default transition on this program. */
2358 rc = security_transition_sid(old_tsec->sid, isec->sid,
2359 SECCLASS_PROCESS, NULL,
2365 * Fallback to old SID on NNP or nosuid if not an allowed
2368 rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
2370 new_tsec->sid = old_tsec->sid;
2373 ad.type = LSM_AUDIT_DATA_FILE;
2374 ad.u.file = bprm->file;
2376 if (new_tsec->sid == old_tsec->sid) {
2377 rc = avc_has_perm(old_tsec->sid, isec->sid,
2378 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2382 /* Check permissions for the transition. */
2383 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2384 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2388 rc = avc_has_perm(new_tsec->sid, isec->sid,
2389 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2393 /* Check for shared state */
2394 if (bprm->unsafe & LSM_UNSAFE_SHARE) {
2395 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2396 SECCLASS_PROCESS, PROCESS__SHARE,
2402 /* Make sure that anyone attempting to ptrace over a task that
2403 * changes its SID has the appropriate permit */
2404 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
2405 u32 ptsid = ptrace_parent_sid();
2407 rc = avc_has_perm(ptsid, new_tsec->sid,
2409 PROCESS__PTRACE, NULL);
2415 /* Clear any possibly unsafe personality bits on exec: */
2416 bprm->per_clear |= PER_CLEAR_ON_SETID;
2422 static int selinux_bprm_secureexec(struct linux_binprm *bprm)
2424 const struct task_security_struct *tsec = current_security();
2432 /* Enable secure mode for SIDs transitions unless
2433 the noatsecure permission is granted between
2434 the two SIDs, i.e. ahp returns 0. */
2435 atsecure = avc_has_perm(osid, sid,
2437 PROCESS__NOATSECURE, NULL);
2443 static int match_file(const void *p, struct file *file, unsigned fd)
2445 return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0;
2448 /* Derived from fs/exec.c:flush_old_files. */
2449 static inline void flush_unauthorized_files(const struct cred *cred,
2450 struct files_struct *files)
2452 struct file *file, *devnull = NULL;
2453 struct tty_struct *tty;
2457 tty = get_current_tty();
2459 spin_lock(&tty->files_lock);
2460 if (!list_empty(&tty->tty_files)) {
2461 struct tty_file_private *file_priv;
2463 /* Revalidate access to controlling tty.
2464 Use file_path_has_perm on the tty path directly
2465 rather than using file_has_perm, as this particular
2466 open file may belong to another process and we are
2467 only interested in the inode-based check here. */
2468 file_priv = list_first_entry(&tty->tty_files,
2469 struct tty_file_private, list);
2470 file = file_priv->file;
2471 if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE))
2474 spin_unlock(&tty->files_lock);
2477 /* Reset controlling tty. */
2481 /* Revalidate access to inherited open files. */
2482 n = iterate_fd(files, 0, match_file, cred);
2483 if (!n) /* none found? */
2486 devnull = dentry_open(&selinux_null, O_RDWR, cred);
2487 if (IS_ERR(devnull))
2489 /* replace all the matching ones with this */
2491 replace_fd(n - 1, devnull, 0);
2492 } while ((n = iterate_fd(files, n, match_file, cred)) != 0);
2498 * Prepare a process for imminent new credential changes due to exec
2500 static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
2502 struct task_security_struct *new_tsec;
2503 struct rlimit *rlim, *initrlim;
2506 new_tsec = bprm->cred->security;
2507 if (new_tsec->sid == new_tsec->osid)
2510 /* Close files for which the new task SID is not authorized. */
2511 flush_unauthorized_files(bprm->cred, current->files);
2513 /* Always clear parent death signal on SID transitions. */
2514 current->pdeath_signal = 0;
2516 /* Check whether the new SID can inherit resource limits from the old
2517 * SID. If not, reset all soft limits to the lower of the current
2518 * task's hard limit and the init task's soft limit.
2520 * Note that the setting of hard limits (even to lower them) can be
2521 * controlled by the setrlimit check. The inclusion of the init task's
2522 * soft limit into the computation is to avoid resetting soft limits
2523 * higher than the default soft limit for cases where the default is
2524 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
2526 rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
2527 PROCESS__RLIMITINH, NULL);
2529 /* protect against do_prlimit() */
2531 for (i = 0; i < RLIM_NLIMITS; i++) {
2532 rlim = current->signal->rlim + i;
2533 initrlim = init_task.signal->rlim + i;
2534 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2536 task_unlock(current);
2537 if (IS_ENABLED(CONFIG_POSIX_TIMERS))
2538 update_rlimit_cpu(current, rlimit(RLIMIT_CPU));
2543 * Clean up the process immediately after the installation of new credentials
2546 static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
2548 const struct task_security_struct *tsec = current_security();
2549 struct itimerval itimer;
2559 /* Check whether the new SID can inherit signal state from the old SID.
2560 * If not, clear itimers to avoid subsequent signal generation and
2561 * flush and unblock signals.
2563 * This must occur _after_ the task SID has been updated so that any
2564 * kill done after the flush will be checked against the new SID.
2566 rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
2568 if (IS_ENABLED(CONFIG_POSIX_TIMERS)) {
2569 memset(&itimer, 0, sizeof itimer);
2570 for (i = 0; i < 3; i++)
2571 do_setitimer(i, &itimer, NULL);
2573 spin_lock_irq(¤t->sighand->siglock);
2574 if (!fatal_signal_pending(current)) {
2575 flush_sigqueue(¤t->pending);
2576 flush_sigqueue(¤t->signal->shared_pending);
2577 flush_signal_handlers(current, 1);
2578 sigemptyset(¤t->blocked);
2579 recalc_sigpending();
2581 spin_unlock_irq(¤t->sighand->siglock);
2584 /* Wake up the parent if it is waiting so that it can recheck
2585 * wait permission to the new task SID. */
2586 read_lock(&tasklist_lock);
2587 __wake_up_parent(current, current->real_parent);
2588 read_unlock(&tasklist_lock);
2591 /* superblock security operations */
2593 static int selinux_sb_alloc_security(struct super_block *sb)
2595 return superblock_alloc_security(sb);
2598 static void selinux_sb_free_security(struct super_block *sb)
2600 superblock_free_security(sb);
2603 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
2608 return !memcmp(prefix, option, plen);
2611 static inline int selinux_option(char *option, int len)
2613 return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
2614 match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
2615 match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
2616 match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) ||
2617 match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len));
2620 static inline void take_option(char **to, char *from, int *first, int len)
2627 memcpy(*to, from, len);
2631 static inline void take_selinux_option(char **to, char *from, int *first,
2634 int current_size = 0;
2642 while (current_size < len) {
2652 static int selinux_sb_copy_data(char *orig, char *copy)
2654 int fnosec, fsec, rc = 0;
2655 char *in_save, *in_curr, *in_end;
2656 char *sec_curr, *nosec_save, *nosec;
2662 nosec = (char *)get_zeroed_page(GFP_KERNEL);
2670 in_save = in_end = orig;
2674 open_quote = !open_quote;
2675 if ((*in_end == ',' && open_quote == 0) ||
2677 int len = in_end - in_curr;
2679 if (selinux_option(in_curr, len))
2680 take_selinux_option(&sec_curr, in_curr, &fsec, len);
2682 take_option(&nosec, in_curr, &fnosec, len);
2684 in_curr = in_end + 1;
2686 } while (*in_end++);
2688 strcpy(in_save, nosec_save);
2689 free_page((unsigned long)nosec_save);
2694 static int selinux_sb_remount(struct super_block *sb, void *data)
2697 struct security_mnt_opts opts;
2698 char *secdata, **mount_options;
2699 struct superblock_security_struct *sbsec = sb->s_security;
2701 if (!(sbsec->flags & SE_SBINITIALIZED))
2707 if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
2710 security_init_mnt_opts(&opts);
2711 secdata = alloc_secdata();
2714 rc = selinux_sb_copy_data(data, secdata);
2716 goto out_free_secdata;
2718 rc = selinux_parse_opts_str(secdata, &opts);
2720 goto out_free_secdata;
2722 mount_options = opts.mnt_opts;
2723 flags = opts.mnt_opts_flags;
2725 for (i = 0; i < opts.num_mnt_opts; i++) {
2728 if (flags[i] == SBLABEL_MNT)
2730 rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL);
2732 printk(KERN_WARNING "SELinux: security_context_str_to_sid"
2733 "(%s) failed for (dev %s, type %s) errno=%d\n",
2734 mount_options[i], sb->s_id, sb->s_type->name, rc);
2740 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
2741 goto out_bad_option;
2744 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
2745 goto out_bad_option;
2747 case ROOTCONTEXT_MNT: {
2748 struct inode_security_struct *root_isec;
2749 root_isec = backing_inode_security(sb->s_root);
2751 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
2752 goto out_bad_option;
2755 case DEFCONTEXT_MNT:
2756 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
2757 goto out_bad_option;
2766 security_free_mnt_opts(&opts);
2768 free_secdata(secdata);
2771 printk(KERN_WARNING "SELinux: unable to change security options "
2772 "during remount (dev %s, type=%s)\n", sb->s_id,
2777 static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
2779 const struct cred *cred = current_cred();
2780 struct common_audit_data ad;
2783 rc = superblock_doinit(sb, data);
2787 /* Allow all mounts performed by the kernel */
2788 if (flags & MS_KERNMOUNT)
2791 ad.type = LSM_AUDIT_DATA_DENTRY;
2792 ad.u.dentry = sb->s_root;
2793 return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
2796 static int selinux_sb_statfs(struct dentry *dentry)
2798 const struct cred *cred = current_cred();
2799 struct common_audit_data ad;
2801 ad.type = LSM_AUDIT_DATA_DENTRY;
2802 ad.u.dentry = dentry->d_sb->s_root;
2803 return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
2806 static int selinux_mount(const char *dev_name,
2807 const struct path *path,
2809 unsigned long flags,
2812 const struct cred *cred = current_cred();
2814 if (flags & MS_REMOUNT)
2815 return superblock_has_perm(cred, path->dentry->d_sb,
2816 FILESYSTEM__REMOUNT, NULL);
2818 return path_has_perm(cred, path, FILE__MOUNTON);
2821 static int selinux_umount(struct vfsmount *mnt, int flags)
2823 const struct cred *cred = current_cred();
2825 return superblock_has_perm(cred, mnt->mnt_sb,
2826 FILESYSTEM__UNMOUNT, NULL);
2829 /* inode security operations */
2831 static int selinux_inode_alloc_security(struct inode *inode)
2833 return inode_alloc_security(inode);
2836 static void selinux_inode_free_security(struct inode *inode)
2838 inode_free_security(inode);
2841 static int selinux_dentry_init_security(struct dentry *dentry, int mode,
2842 const struct qstr *name, void **ctx,
2848 rc = selinux_determine_inode_label(current_security(),
2849 d_inode(dentry->d_parent), name,
2850 inode_mode_to_security_class(mode),
2855 return security_sid_to_context(newsid, (char **)ctx, ctxlen);
2858 static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
2860 const struct cred *old,
2865 struct task_security_struct *tsec;
2867 rc = selinux_determine_inode_label(old->security,
2868 d_inode(dentry->d_parent), name,
2869 inode_mode_to_security_class(mode),
2874 tsec = new->security;
2875 tsec->create_sid = newsid;
2879 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2880 const struct qstr *qstr,
2882 void **value, size_t *len)
2884 const struct task_security_struct *tsec = current_security();
2885 struct superblock_security_struct *sbsec;
2886 u32 sid, newsid, clen;
2890 sbsec = dir->i_sb->s_security;
2893 newsid = tsec->create_sid;
2895 rc = selinux_determine_inode_label(current_security(),
2897 inode_mode_to_security_class(inode->i_mode),
2902 /* Possibly defer initialization to selinux_complete_init. */
2903 if (sbsec->flags & SE_SBINITIALIZED) {
2904 struct inode_security_struct *isec = inode->i_security;
2905 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2907 isec->initialized = LABEL_INITIALIZED;
2910 if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT))
2914 *name = XATTR_SELINUX_SUFFIX;
2917 rc = security_sid_to_context_force(newsid, &context, &clen);
2927 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
2929 return may_create(dir, dentry, SECCLASS_FILE);
2932 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2934 return may_link(dir, old_dentry, MAY_LINK);
2937 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2939 return may_link(dir, dentry, MAY_UNLINK);
2942 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2944 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2947 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask)
2949 return may_create(dir, dentry, SECCLASS_DIR);
2952 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2954 return may_link(dir, dentry, MAY_RMDIR);
2957 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
2959 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2962 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2963 struct inode *new_inode, struct dentry *new_dentry)
2965 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2968 static int selinux_inode_readlink(struct dentry *dentry)
2970 const struct cred *cred = current_cred();
2972 return dentry_has_perm(cred, dentry, FILE__READ);
2975 static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
2978 const struct cred *cred = current_cred();
2979 struct common_audit_data ad;
2980 struct inode_security_struct *isec;
2983 validate_creds(cred);
2985 ad.type = LSM_AUDIT_DATA_DENTRY;
2986 ad.u.dentry = dentry;
2987 sid = cred_sid(cred);
2988 isec = inode_security_rcu(inode, rcu);
2990 return PTR_ERR(isec);
2992 return avc_has_perm_flags(sid, isec->sid, isec->sclass, FILE__READ, &ad,
2993 rcu ? MAY_NOT_BLOCK : 0);
2996 static noinline int audit_inode_permission(struct inode *inode,
2997 u32 perms, u32 audited, u32 denied,
3001 struct common_audit_data ad;
3002 struct inode_security_struct *isec = inode->i_security;
3005 ad.type = LSM_AUDIT_DATA_INODE;
3008 rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms,
3009 audited, denied, result, &ad, flags);
3015 static int selinux_inode_permission(struct inode *inode, int mask)
3017 const struct cred *cred = current_cred();
3020 unsigned flags = mask & MAY_NOT_BLOCK;
3021 struct inode_security_struct *isec;
3023 struct av_decision avd;
3025 u32 audited, denied;
3027 from_access = mask & MAY_ACCESS;
3028 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
3030 /* No permission to check. Existence test. */
3034 validate_creds(cred);
3036 if (unlikely(IS_PRIVATE(inode)))
3039 perms = file_mask_to_av(inode->i_mode, mask);
3041 sid = cred_sid(cred);
3042 isec = inode_security_rcu(inode, flags & MAY_NOT_BLOCK);
3044 return PTR_ERR(isec);
3046 rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd);
3047 audited = avc_audit_required(perms, &avd, rc,
3048 from_access ? FILE__AUDIT_ACCESS : 0,
3050 if (likely(!audited))
3053 rc2 = audit_inode_permission(inode, perms, audited, denied, rc, flags);
3059 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
3061 const struct cred *cred = current_cred();
3062 unsigned int ia_valid = iattr->ia_valid;
3063 __u32 av = FILE__WRITE;
3065 /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */
3066 if (ia_valid & ATTR_FORCE) {
3067 ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE |
3073 if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
3074 ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
3075 return dentry_has_perm(cred, dentry, FILE__SETATTR);
3077 if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE)
3078 && !(ia_valid & ATTR_FILE))
3081 return dentry_has_perm(cred, dentry, av);
3084 static int selinux_inode_getattr(const struct path *path)
3086 return path_has_perm(current_cred(), path, FILE__GETATTR);
3089 static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
3091 const struct cred *cred = current_cred();
3093 if (!strncmp(name, XATTR_SECURITY_PREFIX,
3094 sizeof XATTR_SECURITY_PREFIX - 1)) {
3095 if (!strcmp(name, XATTR_NAME_CAPS)) {
3096 if (!capable(CAP_SETFCAP))
3098 } else if (!capable(CAP_SYS_ADMIN)) {
3099 /* A different attribute in the security namespace.
3100 Restrict to administrator. */
3105 /* Not an attribute we recognize, so just check the
3106 ordinary setattr permission. */
3107 return dentry_has_perm(cred, dentry, FILE__SETATTR);
3110 static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
3111 const void *value, size_t size, int flags)
3113 struct inode *inode = d_backing_inode(dentry);
3114 struct inode_security_struct *isec;
3115 struct superblock_security_struct *sbsec;
3116 struct common_audit_data ad;
3117 u32 newsid, sid = current_sid();
3120 if (strcmp(name, XATTR_NAME_SELINUX))
3121 return selinux_inode_setotherxattr(dentry, name);
3123 sbsec = inode->i_sb->s_security;
3124 if (!(sbsec->flags & SBLABEL_MNT))
3127 if (!inode_owner_or_capable(inode))
3130 ad.type = LSM_AUDIT_DATA_DENTRY;
3131 ad.u.dentry = dentry;
3133 isec = backing_inode_security(dentry);
3134 rc = avc_has_perm(sid, isec->sid, isec->sclass,
3135 FILE__RELABELFROM, &ad);
3139 rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL);
3140 if (rc == -EINVAL) {
3141 if (!capable(CAP_MAC_ADMIN)) {
3142 struct audit_buffer *ab;
3146 /* We strip a nul only if it is at the end, otherwise the
3147 * context contains a nul and we should audit that */
3150 if (str[size - 1] == '\0')
3151 audit_size = size - 1;
3158 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
3159 audit_log_format(ab, "op=setxattr invalid_context=");
3160 audit_log_n_untrustedstring(ab, value, audit_size);
3165 rc = security_context_to_sid_force(value, size, &newsid);
3170 rc = avc_has_perm(sid, newsid, isec->sclass,
3171 FILE__RELABELTO, &ad);
3175 rc = security_validate_transition(isec->sid, newsid, sid,
3180 return avc_has_perm(newsid,
3182 SECCLASS_FILESYSTEM,
3183 FILESYSTEM__ASSOCIATE,
3187 static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
3188 const void *value, size_t size,
3191 struct inode *inode = d_backing_inode(dentry);
3192 struct inode_security_struct *isec;
3196 if (strcmp(name, XATTR_NAME_SELINUX)) {
3197 /* Not an attribute we recognize, so nothing to do. */
3201 rc = security_context_to_sid_force(value, size, &newsid);
3203 printk(KERN_ERR "SELinux: unable to map context to SID"
3204 "for (%s, %lu), rc=%d\n",
3205 inode->i_sb->s_id, inode->i_ino, -rc);
3209 isec = backing_inode_security(dentry);
3210 spin_lock(&isec->lock);
3211 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3213 isec->initialized = LABEL_INITIALIZED;
3214 spin_unlock(&isec->lock);
3219 static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
3221 const struct cred *cred = current_cred();
3223 return dentry_has_perm(cred, dentry, FILE__GETATTR);
3226 static int selinux_inode_listxattr(struct dentry *dentry)
3228 const struct cred *cred = current_cred();
3230 return dentry_has_perm(cred, dentry, FILE__GETATTR);
3233 static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
3235 if (strcmp(name, XATTR_NAME_SELINUX))
3236 return selinux_inode_setotherxattr(dentry, name);
3238 /* No one is allowed to remove a SELinux security label.
3239 You can change the label, but all data must be labeled. */
3244 * Copy the inode security context value to the user.
3246 * Permission check is handled by selinux_inode_getxattr hook.
3248 static int selinux_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc)
3252 char *context = NULL;
3253 struct inode_security_struct *isec;
3255 if (strcmp(name, XATTR_SELINUX_SUFFIX))
3259 * If the caller has CAP_MAC_ADMIN, then get the raw context
3260 * value even if it is not defined by current policy; otherwise,
3261 * use the in-core value under current policy.
3262 * Use the non-auditing forms of the permission checks since
3263 * getxattr may be called by unprivileged processes commonly
3264 * and lack of permission just means that we fall back to the
3265 * in-core context value, not a denial.
3267 error = cap_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN,
3268 SECURITY_CAP_NOAUDIT);
3270 error = cred_has_capability(current_cred(), CAP_MAC_ADMIN,
3271 SECURITY_CAP_NOAUDIT, true);
3272 isec = inode_security(inode);
3274 error = security_sid_to_context_force(isec->sid, &context,
3277 error = security_sid_to_context(isec->sid, &context, &size);
3290 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
3291 const void *value, size_t size, int flags)
3293 struct inode_security_struct *isec = inode_security_novalidate(inode);
3297 if (strcmp(name, XATTR_SELINUX_SUFFIX))
3300 if (!value || !size)
3303 rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL);
3307 spin_lock(&isec->lock);
3308 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3310 isec->initialized = LABEL_INITIALIZED;
3311 spin_unlock(&isec->lock);
3315 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
3317 const int len = sizeof(XATTR_NAME_SELINUX);
3318 if (buffer && len <= buffer_size)
3319 memcpy(buffer, XATTR_NAME_SELINUX, len);
3323 static void selinux_inode_getsecid(struct inode *inode, u32 *secid)
3325 struct inode_security_struct *isec = inode_security_novalidate(inode);
3329 static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
3332 struct task_security_struct *tsec;
3333 struct cred *new_creds = *new;
3335 if (new_creds == NULL) {
3336 new_creds = prepare_creds();
3341 tsec = new_creds->security;
3342 /* Get label from overlay inode and set it in create_sid */
3343 selinux_inode_getsecid(d_inode(src), &sid);
3344 tsec->create_sid = sid;
3349 static int selinux_inode_copy_up_xattr(const char *name)
3351 /* The copy_up hook above sets the initial context on an inode, but we
3352 * don't then want to overwrite it by blindly copying all the lower
3353 * xattrs up. Instead, we have to filter out SELinux-related xattrs.
3355 if (strcmp(name, XATTR_NAME_SELINUX) == 0)
3356 return 1; /* Discard */
3358 * Any other attribute apart from SELINUX is not claimed, supported
3364 /* file security operations */
3366 static int selinux_revalidate_file_permission(struct file *file, int mask)
3368 const struct cred *cred = current_cred();
3369 struct inode *inode = file_inode(file);
3371 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
3372 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
3375 return file_has_perm(cred, file,
3376 file_mask_to_av(inode->i_mode, mask));
3379 static int selinux_file_permission(struct file *file, int mask)
3381 struct inode *inode = file_inode(file);
3382 struct file_security_struct *fsec = file->f_security;
3383 struct inode_security_struct *isec;
3384 u32 sid = current_sid();
3387 /* No permission to check. Existence test. */
3390 isec = inode_security(inode);
3391 if (sid == fsec->sid && fsec->isid == isec->sid &&
3392 fsec->pseqno == avc_policy_seqno())
3393 /* No change since file_open check. */
3396 return selinux_revalidate_file_permission(file, mask);
3399 static int selinux_file_alloc_security(struct file *file)
3401 return file_alloc_security(file);
3404 static void selinux_file_free_security(struct file *file)
3406 file_free_security(file);
3410 * Check whether a task has the ioctl permission and cmd
3411 * operation to an inode.
3413 static int ioctl_has_perm(const struct cred *cred, struct file *file,
3414 u32 requested, u16 cmd)
3416 struct common_audit_data ad;
3417 struct file_security_struct *fsec = file->f_security;
3418 struct inode *inode = file_inode(file);
3419 struct inode_security_struct *isec;
3420 struct lsm_ioctlop_audit ioctl;
3421 u32 ssid = cred_sid(cred);
3423 u8 driver = cmd >> 8;
3424 u8 xperm = cmd & 0xff;
3426 ad.type = LSM_AUDIT_DATA_IOCTL_OP;
3429 ad.u.op->path = file->f_path;
3431 if (ssid != fsec->sid) {
3432 rc = avc_has_perm(ssid, fsec->sid,
3440 if (unlikely(IS_PRIVATE(inode)))
3443 isec = inode_security(inode);
3444 rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass,
3445 requested, driver, xperm, &ad);
3450 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
3453 const struct cred *cred = current_cred();
3463 case FS_IOC_GETFLAGS:
3465 case FS_IOC_GETVERSION:
3466 error = file_has_perm(cred, file, FILE__GETATTR);
3469 case FS_IOC_SETFLAGS:
3471 case FS_IOC_SETVERSION:
3472 error = file_has_perm(cred, file, FILE__SETATTR);
3475 /* sys_ioctl() checks */
3479 error = file_has_perm(cred, file, 0);
3484 error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
3485 SECURITY_CAP_AUDIT, true);
3488 /* default case assumes that the command will go
3489 * to the file's ioctl() function.
3492 error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
3497 static int default_noexec;
3499 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
3501 const struct cred *cred = current_cred();
3502 u32 sid = cred_sid(cred);
3505 if (default_noexec &&
3506 (prot & PROT_EXEC) && (!file || IS_PRIVATE(file_inode(file)) ||
3507 (!shared && (prot & PROT_WRITE)))) {
3509 * We are making executable an anonymous mapping or a
3510 * private file mapping that will also be writable.
3511 * This has an additional check.
3513 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3514 PROCESS__EXECMEM, NULL);
3520 /* read access is always possible with a mapping */
3521 u32 av = FILE__READ;
3523 /* write access only matters if the mapping is shared */
3524 if (shared && (prot & PROT_WRITE))
3527 if (prot & PROT_EXEC)
3528 av |= FILE__EXECUTE;
3530 return file_has_perm(cred, file, av);
3537 static int selinux_mmap_addr(unsigned long addr)
3541 if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
3542 u32 sid = current_sid();
3543 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3544 MEMPROTECT__MMAP_ZERO, NULL);
3550 static int selinux_mmap_file(struct file *file, unsigned long reqprot,
3551 unsigned long prot, unsigned long flags)
3553 if (selinux_checkreqprot)
3556 return file_map_prot_check(file, prot,
3557 (flags & MAP_TYPE) == MAP_SHARED);
3560 static int selinux_file_mprotect(struct vm_area_struct *vma,
3561 unsigned long reqprot,
3564 const struct cred *cred = current_cred();
3565 u32 sid = cred_sid(cred);
3567 if (selinux_checkreqprot)
3570 if (default_noexec &&
3571 (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
3573 if (vma->vm_start >= vma->vm_mm->start_brk &&
3574 vma->vm_end <= vma->vm_mm->brk) {
3575 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3576 PROCESS__EXECHEAP, NULL);
3577 } else if (!vma->vm_file &&
3578 ((vma->vm_start <= vma->vm_mm->start_stack &&
3579 vma->vm_end >= vma->vm_mm->start_stack) ||
3580 vma_is_stack_for_current(vma))) {
3581 rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
3582 PROCESS__EXECSTACK, NULL);
3583 } else if (vma->vm_file && vma->anon_vma) {
3585 * We are making executable a file mapping that has
3586 * had some COW done. Since pages might have been
3587 * written, check ability to execute the possibly
3588 * modified content. This typically should only
3589 * occur for text relocations.
3591 rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
3597 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3600 static int selinux_file_lock(struct file *file, unsigned int cmd)
3602 const struct cred *cred = current_cred();
3604 return file_has_perm(cred, file, FILE__LOCK);
3607 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3610 const struct cred *cred = current_cred();
3615 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
3616 err = file_has_perm(cred, file, FILE__WRITE);
3625 case F_GETOWNER_UIDS:
3626 /* Just check FD__USE permission */
3627 err = file_has_perm(cred, file, 0);
3635 #if BITS_PER_LONG == 32
3640 err = file_has_perm(cred, file, FILE__LOCK);
3647 static void selinux_file_set_fowner(struct file *file)
3649 struct file_security_struct *fsec;
3651 fsec = file->f_security;
3652 fsec->fown_sid = current_sid();
3655 static int selinux_file_send_sigiotask(struct task_struct *tsk,
3656 struct fown_struct *fown, int signum)
3659 u32 sid = task_sid(tsk);
3661 struct file_security_struct *fsec;
3663 /* struct fown_struct is never outside the context of a struct file */
3664 file = container_of(fown, struct file, f_owner);
3666 fsec = file->f_security;
3669 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
3671 perm = signal_to_av(signum);
3673 return avc_has_perm(fsec->fown_sid, sid,
3674 SECCLASS_PROCESS, perm, NULL);
3677 static int selinux_file_receive(struct file *file)
3679 const struct cred *cred = current_cred();
3681 return file_has_perm(cred, file, file_to_av(file));
3684 static int selinux_file_open(struct file *file, const struct cred *cred)
3686 struct file_security_struct *fsec;
3687 struct inode_security_struct *isec;
3689 fsec = file->f_security;
3690 isec = inode_security(file_inode(file));
3692 * Save inode label and policy sequence number
3693 * at open-time so that selinux_file_permission
3694 * can determine whether revalidation is necessary.
3695 * Task label is already saved in the file security
3696 * struct as its SID.
3698 fsec->isid = isec->sid;
3699 fsec->pseqno = avc_policy_seqno();
3701 * Since the inode label or policy seqno may have changed
3702 * between the selinux_inode_permission check and the saving
3703 * of state above, recheck that access is still permitted.
3704 * Otherwise, access might never be revalidated against the
3705 * new inode label or new policy.
3706 * This check is not redundant - do not remove.
3708 return file_path_has_perm(cred, file, open_file_to_av(file));
3711 /* task security operations */
3713 static int selinux_task_create(unsigned long clone_flags)
3715 u32 sid = current_sid();
3717 return avc_has_perm(sid, sid, SECCLASS_PROCESS, PROCESS__FORK, NULL);
3721 * allocate the SELinux part of blank credentials
3723 static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp)
3725 struct task_security_struct *tsec;
3727 tsec = kzalloc(sizeof(struct task_security_struct), gfp);
3731 cred->security = tsec;
3736 * detach and free the LSM part of a set of credentials
3738 static void selinux_cred_free(struct cred *cred)
3740 struct task_security_struct *tsec = cred->security;
3743 * cred->security == NULL if security_cred_alloc_blank() or
3744 * security_prepare_creds() returned an error.
3746 BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE);
3747 cred->security = (void *) 0x7UL;
3752 * prepare a new set of credentials for modification
3754 static int selinux_cred_prepare(struct cred *new, const struct cred *old,
3757 const struct task_security_struct *old_tsec;
3758 struct task_security_struct *tsec;
3760 old_tsec = old->security;
3762 tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
3766 new->security = tsec;
3771 * transfer the SELinux data to a blank set of creds
3773 static void selinux_cred_transfer(struct cred *new, const struct cred *old)
3775 const struct task_security_struct *old_tsec = old->security;
3776 struct task_security_struct *tsec = new->security;
3782 * set the security data for a kernel service
3783 * - all the creation contexts are set to unlabelled
3785 static int selinux_kernel_act_as(struct cred *new, u32 secid)
3787 struct task_security_struct *tsec = new->security;
3788 u32 sid = current_sid();
3791 ret = avc_has_perm(sid, secid,
3792 SECCLASS_KERNEL_SERVICE,
3793 KERNEL_SERVICE__USE_AS_OVERRIDE,
3797 tsec->create_sid = 0;
3798 tsec->keycreate_sid = 0;
3799 tsec->sockcreate_sid = 0;
3805 * set the file creation context in a security record to the same as the
3806 * objective context of the specified inode
3808 static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
3810 struct inode_security_struct *isec = inode_security(inode);
3811 struct task_security_struct *tsec = new->security;
3812 u32 sid = current_sid();
3815 ret = avc_has_perm(sid, isec->sid,
3816 SECCLASS_KERNEL_SERVICE,
3817 KERNEL_SERVICE__CREATE_FILES_AS,
3821 tsec->create_sid = isec->sid;
3825 static int selinux_kernel_module_request(char *kmod_name)
3827 struct common_audit_data ad;
3829 ad.type = LSM_AUDIT_DATA_KMOD;
3830 ad.u.kmod_name = kmod_name;
3832 return avc_has_perm(current_sid(), SECINITSID_KERNEL, SECCLASS_SYSTEM,
3833 SYSTEM__MODULE_REQUEST, &ad);
3836 static int selinux_kernel_module_from_file(struct file *file)
3838 struct common_audit_data ad;
3839 struct inode_security_struct *isec;
3840 struct file_security_struct *fsec;
3841 u32 sid = current_sid();
3846 return avc_has_perm(sid, sid, SECCLASS_SYSTEM,
3847 SYSTEM__MODULE_LOAD, NULL);
3851 ad.type = LSM_AUDIT_DATA_FILE;
3854 fsec = file->f_security;
3855 if (sid != fsec->sid) {
3856 rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
3861 isec = inode_security(file_inode(file));
3862 return avc_has_perm(sid, isec->sid, SECCLASS_SYSTEM,
3863 SYSTEM__MODULE_LOAD, &ad);
3866 static int selinux_kernel_read_file(struct file *file,
3867 enum kernel_read_file_id id)
3872 case READING_MODULE:
3873 rc = selinux_kernel_module_from_file(file);
3882 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
3884 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3885 PROCESS__SETPGID, NULL);
3888 static int selinux_task_getpgid(struct task_struct *p)
3890 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3891 PROCESS__GETPGID, NULL);
3894 static int selinux_task_getsid(struct task_struct *p)
3896 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3897 PROCESS__GETSESSION, NULL);
3900 static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
3902 *secid = task_sid(p);
3905 static int selinux_task_setnice(struct task_struct *p, int nice)
3907 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3908 PROCESS__SETSCHED, NULL);
3911 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
3913 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3914 PROCESS__SETSCHED, NULL);
3917 static int selinux_task_getioprio(struct task_struct *p)
3919 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3920 PROCESS__GETSCHED, NULL);
3923 int selinux_task_prlimit(const struct cred *cred, const struct cred *tcred,
3930 if (flags & LSM_PRLIMIT_WRITE)
3931 av |= PROCESS__SETRLIMIT;
3932 if (flags & LSM_PRLIMIT_READ)
3933 av |= PROCESS__GETRLIMIT;
3934 return avc_has_perm(cred_sid(cred), cred_sid(tcred),
3935 SECCLASS_PROCESS, av, NULL);
3938 static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
3939 struct rlimit *new_rlim)
3941 struct rlimit *old_rlim = p->signal->rlim + resource;
3943 /* Control the ability to change the hard limit (whether
3944 lowering or raising it), so that the hard limit can
3945 later be used as a safe reset point for the soft limit
3946 upon context transitions. See selinux_bprm_committing_creds. */
3947 if (old_rlim->rlim_max != new_rlim->rlim_max)
3948 return avc_has_perm(current_sid(), task_sid(p),
3949 SECCLASS_PROCESS, PROCESS__SETRLIMIT, NULL);
3954 static int selinux_task_setscheduler(struct task_struct *p)
3956 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3957 PROCESS__SETSCHED, NULL);
3960 static int selinux_task_getscheduler(struct task_struct *p)
3962 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3963 PROCESS__GETSCHED, NULL);
3966 static int selinux_task_movememory(struct task_struct *p)
3968 return avc_has_perm(current_sid(), task_sid(p), SECCLASS_PROCESS,
3969 PROCESS__SETSCHED, NULL);
3972 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
3978 perm = PROCESS__SIGNULL; /* null signal; existence test */
3980 perm = signal_to_av(sig);
3982 secid = current_sid();
3983 return avc_has_perm(secid, task_sid(p), SECCLASS_PROCESS, perm, NULL);
3986 static void selinux_task_to_inode(struct task_struct *p,
3987 struct inode *inode)
3989 struct inode_security_struct *isec = inode->i_security;
3990 u32 sid = task_sid(p);
3992 spin_lock(&isec->lock);
3993 isec->sclass = inode_mode_to_security_class(inode->i_mode);
3995 isec->initialized = LABEL_INITIALIZED;
3996 spin_unlock(&isec->lock);
3999 /* Returns error only if unable to parse addresses */
4000 static int selinux_parse_skb_ipv4(struct sk_buff *skb,
4001 struct common_audit_data *ad, u8 *proto)
4003 int offset, ihlen, ret = -EINVAL;
4004 struct iphdr _iph, *ih;
4006 offset = skb_network_offset(skb);
4007 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
4011 ihlen = ih->ihl * 4;
4012 if (ihlen < sizeof(_iph))
4015 ad->u.net->v4info.saddr = ih->saddr;
4016 ad->u.net->v4info.daddr = ih->daddr;
4020 *proto = ih->protocol;
4022 switch (ih->protocol) {
4024 struct tcphdr _tcph, *th;
4026 if (ntohs(ih->frag_off) & IP_OFFSET)
4030 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
4034 ad->u.net->sport = th->source;
4035 ad->u.net->dport = th->dest;
4040 struct udphdr _udph, *uh;
4042 if (ntohs(ih->frag_off) & IP_OFFSET)
4046 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
4050 ad->u.net->sport = uh->source;
4051 ad->u.net->dport = uh->dest;
4055 case IPPROTO_DCCP: {
4056 struct dccp_hdr _dccph, *dh;
4058 if (ntohs(ih->frag_off) & IP_OFFSET)
4062 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
4066 ad->u.net->sport = dh->dccph_sport;
4067 ad->u.net->dport = dh->dccph_dport;
4078 #if IS_ENABLED(CONFIG_IPV6)
4080 /* Returns error only if unable to parse addresses */
4081 static int selinux_parse_skb_ipv6(struct sk_buff *skb,
4082 struct common_audit_data *ad, u8 *proto)
4085 int ret = -EINVAL, offset;
4086 struct ipv6hdr _ipv6h, *ip6;
4089 offset = skb_network_offset(skb);
4090 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
4094 ad->u.net->v6info.saddr = ip6->saddr;
4095 ad->u.net->v6info.daddr = ip6->daddr;
4098 nexthdr = ip6->nexthdr;
4099 offset += sizeof(_ipv6h);
4100 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
4109 struct tcphdr _tcph, *th;
4111 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
4115 ad->u.net->sport = th->source;
4116 ad->u.net->dport = th->dest;
4121 struct udphdr _udph, *uh;
4123 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
4127 ad->u.net->sport = uh->source;
4128 ad->u.net->dport = uh->dest;
4132 case IPPROTO_DCCP: {
4133 struct dccp_hdr _dccph, *dh;
4135 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
4139 ad->u.net->sport = dh->dccph_sport;
4140 ad->u.net->dport = dh->dccph_dport;
4144 /* includes fragments */
4154 static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
4155 char **_addrp, int src, u8 *proto)
4160 switch (ad->u.net->family) {
4162 ret = selinux_parse_skb_ipv4(skb, ad, proto);
4165 addrp = (char *)(src ? &ad->u.net->v4info.saddr :
4166 &ad->u.net->v4info.daddr);
4169 #if IS_ENABLED(CONFIG_IPV6)
4171 ret = selinux_parse_skb_ipv6(skb, ad, proto);
4174 addrp = (char *)(src ? &ad->u.net->v6info.saddr :
4175 &ad->u.net->v6info.daddr);
4185 "SELinux: failure in selinux_parse_skb(),"
4186 " unable to parse packet\n");
4196 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
4198 * @family: protocol family
4199 * @sid: the packet's peer label SID
4202 * Check the various different forms of network peer labeling and determine
4203 * the peer label/SID for the packet; most of the magic actually occurs in
4204 * the security server function security_net_peersid_cmp(). The function
4205 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
4206 * or -EACCES if @sid is invalid due to inconsistencies with the different
4210 static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
4217 err = selinux_xfrm_skb_sid(skb, &xfrm_sid);
4220 err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
4224 err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
4225 if (unlikely(err)) {
4227 "SELinux: failure in selinux_skb_peerlbl_sid(),"
4228 " unable to determine packet's peer label\n");
4236 * selinux_conn_sid - Determine the child socket label for a connection
4237 * @sk_sid: the parent socket's SID
4238 * @skb_sid: the packet's SID
4239 * @conn_sid: the resulting connection SID
4241 * If @skb_sid is valid then the user:role:type information from @sk_sid is
4242 * combined with the MLS information from @skb_sid in order to create
4243 * @conn_sid. If @skb_sid is not valid then then @conn_sid is simply a copy
4244 * of @sk_sid. Returns zero on success, negative values on failure.
4247 static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid)
4251 if (skb_sid != SECSID_NULL)
4252 err = security_sid_mls_copy(sk_sid, skb_sid, conn_sid);
4259 /* socket security operations */
4261 static int socket_sockcreate_sid(const struct task_security_struct *tsec,
4262 u16 secclass, u32 *socksid)
4264 if (tsec->sockcreate_sid > SECSID_NULL) {
4265 *socksid = tsec->sockcreate_sid;
4269 return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL,
4273 static int sock_has_perm(struct sock *sk, u32 perms)
4275 struct sk_security_struct *sksec = sk->sk_security;
4276 struct common_audit_data ad;
4277 struct lsm_network_audit net = {0,};
4279 if (sksec->sid == SECINITSID_KERNEL)
4282 ad.type = LSM_AUDIT_DATA_NET;
4286 return avc_has_perm(current_sid(), sksec->sid, sksec->sclass, perms,
4290 static int selinux_socket_create(int family, int type,
4291 int protocol, int kern)
4293 const struct task_security_struct *tsec = current_security();
4301 secclass = socket_type_to_security_class(family, type, protocol);
4302 rc = socket_sockcreate_sid(tsec, secclass, &newsid);
4306 return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
4309 static int selinux_socket_post_create(struct socket *sock, int family,
4310 int type, int protocol, int kern)
4312 const struct task_security_struct *tsec = current_security();
4313 struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock));
4314 struct sk_security_struct *sksec;
4315 u16 sclass = socket_type_to_security_class(family, type, protocol);
4316 u32 sid = SECINITSID_KERNEL;
4320 err = socket_sockcreate_sid(tsec, sclass, &sid);
4325 isec->sclass = sclass;
4327 isec->initialized = LABEL_INITIALIZED;
4330 sksec = sock->sk->sk_security;
4331 sksec->sclass = sclass;
4333 err = selinux_netlbl_socket_post_create(sock->sk, family);
4339 /* Range of port numbers used to automatically bind.
4340 Need to determine whether we should perform a name_bind
4341 permission check between the socket and the port number. */
4343 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
4345 struct sock *sk = sock->sk;
4349 err = sock_has_perm(sk, SOCKET__BIND);
4354 * If PF_INET or PF_INET6, check name_bind permission for the port.
4355 * Multiple address binding for SCTP is not supported yet: we just
4356 * check the first address now.
4358 family = sk->sk_family;
4359 if (family == PF_INET || family == PF_INET6) {
4361 struct sk_security_struct *sksec = sk->sk_security;
4362 struct common_audit_data ad;
4363 struct lsm_network_audit net = {0,};
4364 struct sockaddr_in *addr4 = NULL;
4365 struct sockaddr_in6 *addr6 = NULL;
4366 unsigned short snum;
4369 if (family == PF_INET) {
4370 if (addrlen < sizeof(struct sockaddr_in)) {
4374 addr4 = (struct sockaddr_in *)address;
4375 snum = ntohs(addr4->sin_port);
4376 addrp = (char *)&addr4->sin_addr.s_addr;
4378 if (addrlen < SIN6_LEN_RFC2133) {
4382 addr6 = (struct sockaddr_in6 *)address;
4383 snum = ntohs(addr6->sin6_port);
4384 addrp = (char *)&addr6->sin6_addr.s6_addr;
4390 inet_get_local_port_range(sock_net(sk), &low, &high);
4392 if (snum < max(inet_prot_sock(sock_net(sk)), low) ||
4394 err = sel_netport_sid(sk->sk_protocol,
4398 ad.type = LSM_AUDIT_DATA_NET;
4400 ad.u.net->sport = htons(snum);
4401 ad.u.net->family = family;
4402 err = avc_has_perm(sksec->sid, sid,
4404 SOCKET__NAME_BIND, &ad);
4410 switch (sksec->sclass) {
4411 case SECCLASS_TCP_SOCKET:
4412 node_perm = TCP_SOCKET__NODE_BIND;
4415 case SECCLASS_UDP_SOCKET:
4416 node_perm = UDP_SOCKET__NODE_BIND;
4419 case SECCLASS_DCCP_SOCKET:
4420 node_perm = DCCP_SOCKET__NODE_BIND;
4424 node_perm = RAWIP_SOCKET__NODE_BIND;
4428 err = sel_netnode_sid(addrp, family, &sid);
4432 ad.type = LSM_AUDIT_DATA_NET;
4434 ad.u.net->sport = htons(snum);
4435 ad.u.net->family = family;
4437 if (family == PF_INET)
4438 ad.u.net->v4info.saddr = addr4->sin_addr.s_addr;
4440 ad.u.net->v6info.saddr = addr6->sin6_addr;
4442 err = avc_has_perm(sksec->sid, sid,
4443 sksec->sclass, node_perm, &ad);
4451 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
4453 struct sock *sk = sock->sk;
4454 struct sk_security_struct *sksec = sk->sk_security;
4457 err = sock_has_perm(sk, SOCKET__CONNECT);
4462 * If a TCP or DCCP socket, check name_connect permission for the port.
4464 if (sksec->sclass == SECCLASS_TCP_SOCKET ||
4465 sksec->sclass == SECCLASS_DCCP_SOCKET) {
4466 struct common_audit_data ad;
4467 struct lsm_network_audit net = {0,};
4468 struct sockaddr_in *addr4 = NULL;
4469 struct sockaddr_in6 *addr6 = NULL;
4470 unsigned short snum;
4473 if (sk->sk_family == PF_INET) {
4474 addr4 = (struct sockaddr_in *)address;
4475 if (addrlen < sizeof(struct sockaddr_in))
4477 snum = ntohs(addr4->sin_port);
4479 addr6 = (struct sockaddr_in6 *)address;
4480 if (addrlen < SIN6_LEN_RFC2133)
4482 snum = ntohs(addr6->sin6_port);
4485 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
4489 perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ?
4490 TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
4492 ad.type = LSM_AUDIT_DATA_NET;
4494 ad.u.net->dport = htons(snum);
4495 ad.u.net->family = sk->sk_family;
4496 err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad);
4501 err = selinux_netlbl_socket_connect(sk, address);
4507 static int selinux_socket_listen(struct socket *sock, int backlog)
4509 return sock_has_perm(sock->sk, SOCKET__LISTEN);
4512 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
4515 struct inode_security_struct *isec;
4516 struct inode_security_struct *newisec;
4520 err = sock_has_perm(sock->sk, SOCKET__ACCEPT);
4524 isec = inode_security_novalidate(SOCK_INODE(sock));
4525 spin_lock(&isec->lock);
4526 sclass = isec->sclass;
4528 spin_unlock(&isec->lock);
4530 newisec = inode_security_novalidate(SOCK_INODE(newsock));
4531 newisec->sclass = sclass;
4533 newisec->initialized = LABEL_INITIALIZED;
4538 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
4541 return sock_has_perm(sock->sk, SOCKET__WRITE);
4544 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
4545 int size, int flags)
4547 return sock_has_perm(sock->sk, SOCKET__READ);
4550 static int selinux_socket_getsockname(struct socket *sock)
4552 return sock_has_perm(sock->sk, SOCKET__GETATTR);
4555 static int selinux_socket_getpeername(struct socket *sock)
4557 return sock_has_perm(sock->sk, SOCKET__GETATTR);
4560 static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
4564 err = sock_has_perm(sock->sk, SOCKET__SETOPT);
4568 return selinux_netlbl_socket_setsockopt(sock, level, optname);
4571 static int selinux_socket_getsockopt(struct socket *sock, int level,
4574 return sock_has_perm(sock->sk, SOCKET__GETOPT);
4577 static int selinux_socket_shutdown(struct socket *sock, int how)
4579 return sock_has_perm(sock->sk, SOCKET__SHUTDOWN);
4582 static int selinux_socket_unix_stream_connect(struct sock *sock,
4586 struct sk_security_struct *sksec_sock = sock->sk_security;
4587 struct sk_security_struct *sksec_other = other->sk_security;
4588 struct sk_security_struct *sksec_new = newsk->sk_security;
4589 struct common_audit_data ad;
4590 struct lsm_network_audit net = {0,};
4593 ad.type = LSM_AUDIT_DATA_NET;
4595 ad.u.net->sk = other;
4597 err = avc_has_perm(sksec_sock->sid, sksec_other->sid,
4598 sksec_other->sclass,
4599 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
4603 /* server child socket */
4604 sksec_new->peer_sid = sksec_sock->sid;
4605 err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid,
4610 /* connecting socket */
4611 sksec_sock->peer_sid = sksec_new->sid;
4616 static int selinux_socket_unix_may_send(struct socket *sock,
4617 struct socket *other)
4619 struct sk_security_struct *ssec = sock->sk->sk_security;
4620 struct sk_security_struct *osec = other->sk->sk_security;
4621 struct common_audit_data ad;
4622 struct lsm_network_audit net = {0,};
4624 ad.type = LSM_AUDIT_DATA_NET;
4626 ad.u.net->sk = other->sk;
4628 return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
4632 static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
4633 char *addrp, u16 family, u32 peer_sid,
4634 struct common_audit_data *ad)
4640 err = sel_netif_sid(ns, ifindex, &if_sid);
4643 err = avc_has_perm(peer_sid, if_sid,
4644 SECCLASS_NETIF, NETIF__INGRESS, ad);
4648 err = sel_netnode_sid(addrp, family, &node_sid);
4651 return avc_has_perm(peer_sid, node_sid,
4652 SECCLASS_NODE, NODE__RECVFROM, ad);
4655 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
4659 struct sk_security_struct *sksec = sk->sk_security;
4660 u32 sk_sid = sksec->sid;
4661 struct common_audit_data ad;
4662 struct lsm_network_audit net = {0,};
4665 ad.type = LSM_AUDIT_DATA_NET;
4667 ad.u.net->netif = skb->skb_iif;
4668 ad.u.net->family = family;
4669 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4673 if (selinux_secmark_enabled()) {
4674 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4680 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
4683 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
4688 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4691 struct sk_security_struct *sksec = sk->sk_security;
4692 u16 family = sk->sk_family;
4693 u32 sk_sid = sksec->sid;
4694 struct common_audit_data ad;
4695 struct lsm_network_audit net = {0,};
4700 if (family != PF_INET && family != PF_INET6)
4703 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
4704 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4707 /* If any sort of compatibility mode is enabled then handoff processing
4708 * to the selinux_sock_rcv_skb_compat() function to deal with the
4709 * special handling. We do this in an attempt to keep this function
4710 * as fast and as clean as possible. */
4711 if (!selinux_policycap_netpeer)
4712 return selinux_sock_rcv_skb_compat(sk, skb, family);
4714 secmark_active = selinux_secmark_enabled();
4715 peerlbl_active = selinux_peerlbl_enabled();
4716 if (!secmark_active && !peerlbl_active)
4719 ad.type = LSM_AUDIT_DATA_NET;
4721 ad.u.net->netif = skb->skb_iif;
4722 ad.u.net->family = family;
4723 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4727 if (peerlbl_active) {
4730 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4733 err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif,
4734 addrp, family, peer_sid, &ad);
4736 selinux_netlbl_err(skb, family, err, 0);
4739 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
4742 selinux_netlbl_err(skb, family, err, 0);
4747 if (secmark_active) {
4748 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4757 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
4758 int __user *optlen, unsigned len)
4763 struct sk_security_struct *sksec = sock->sk->sk_security;
4764 u32 peer_sid = SECSID_NULL;
4766 if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
4767 sksec->sclass == SECCLASS_TCP_SOCKET)
4768 peer_sid = sksec->peer_sid;
4769 if (peer_sid == SECSID_NULL)
4770 return -ENOPROTOOPT;
4772 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
4776 if (scontext_len > len) {
4781 if (copy_to_user(optval, scontext, scontext_len))
4785 if (put_user(scontext_len, optlen))
4791 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
4793 u32 peer_secid = SECSID_NULL;
4795 struct inode_security_struct *isec;
4797 if (skb && skb->protocol == htons(ETH_P_IP))
4799 else if (skb && skb->protocol == htons(ETH_P_IPV6))
4802 family = sock->sk->sk_family;
4806 if (sock && family == PF_UNIX) {
4807 isec = inode_security_novalidate(SOCK_INODE(sock));
4808 peer_secid = isec->sid;
4810 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
4813 *secid = peer_secid;
4814 if (peer_secid == SECSID_NULL)
4819 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
4821 struct sk_security_struct *sksec;
4823 sksec = kzalloc(sizeof(*sksec), priority);
4827 sksec->peer_sid = SECINITSID_UNLABELED;
4828 sksec->sid = SECINITSID_UNLABELED;
4829 sksec->sclass = SECCLASS_SOCKET;
4830 selinux_netlbl_sk_security_reset(sksec);
4831 sk->sk_security = sksec;
4836 static void selinux_sk_free_security(struct sock *sk)
4838 struct sk_security_struct *sksec = sk->sk_security;
4840 sk->sk_security = NULL;
4841 selinux_netlbl_sk_security_free(sksec);
4845 static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4847 struct sk_security_struct *sksec = sk->sk_security;
4848 struct sk_security_struct *newsksec = newsk->sk_security;
4850 newsksec->sid = sksec->sid;
4851 newsksec->peer_sid = sksec->peer_sid;
4852 newsksec->sclass = sksec->sclass;
4854 selinux_netlbl_sk_security_reset(newsksec);
4857 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
4860 *secid = SECINITSID_ANY_SOCKET;
4862 struct sk_security_struct *sksec = sk->sk_security;
4864 *secid = sksec->sid;
4868 static void selinux_sock_graft(struct sock *sk, struct socket *parent)
4870 struct inode_security_struct *isec =
4871 inode_security_novalidate(SOCK_INODE(parent));
4872 struct sk_security_struct *sksec = sk->sk_security;
4874 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
4875 sk->sk_family == PF_UNIX)
4876 isec->sid = sksec->sid;
4877 sksec->sclass = isec->sclass;
4880 static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4881 struct request_sock *req)
4883 struct sk_security_struct *sksec = sk->sk_security;
4885 u16 family = req->rsk_ops->family;
4889 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
4892 err = selinux_conn_sid(sksec->sid, peersid, &connsid);
4895 req->secid = connsid;
4896 req->peer_secid = peersid;
4898 return selinux_netlbl_inet_conn_request(req, family);
4901 static void selinux_inet_csk_clone(struct sock *newsk,
4902 const struct request_sock *req)
4904 struct sk_security_struct *newsksec = newsk->sk_security;
4906 newsksec->sid = req->secid;
4907 newsksec->peer_sid = req->peer_secid;
4908 /* NOTE: Ideally, we should also get the isec->sid for the
4909 new socket in sync, but we don't have the isec available yet.
4910 So we will wait until sock_graft to do it, by which
4911 time it will have been created and available. */
4913 /* We don't need to take any sort of lock here as we are the only
4914 * thread with access to newsksec */
4915 selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
4918 static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
4920 u16 family = sk->sk_family;
4921 struct sk_security_struct *sksec = sk->sk_security;
4923 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4924 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4927 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
4930 static int selinux_secmark_relabel_packet(u32 sid)
4932 const struct task_security_struct *__tsec;
4935 __tsec = current_security();
4938 return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL);
4941 static void selinux_secmark_refcount_inc(void)
4943 atomic_inc(&selinux_secmark_refcount);
4946 static void selinux_secmark_refcount_dec(void)
4948 atomic_dec(&selinux_secmark_refcount);
4951 static void selinux_req_classify_flow(const struct request_sock *req,
4954 fl->flowi_secid = req->secid;
4957 static int selinux_tun_dev_alloc_security(void **security)
4959 struct tun_security_struct *tunsec;
4961 tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL);
4964 tunsec->sid = current_sid();
4970 static void selinux_tun_dev_free_security(void *security)
4975 static int selinux_tun_dev_create(void)
4977 u32 sid = current_sid();
4979 /* we aren't taking into account the "sockcreate" SID since the socket
4980 * that is being created here is not a socket in the traditional sense,
4981 * instead it is a private sock, accessible only to the kernel, and
4982 * representing a wide range of network traffic spanning multiple
4983 * connections unlike traditional sockets - check the TUN driver to
4984 * get a better understanding of why this socket is special */
4986 return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE,
4990 static int selinux_tun_dev_attach_queue(void *security)
4992 struct tun_security_struct *tunsec = security;
4994 return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET,
4995 TUN_SOCKET__ATTACH_QUEUE, NULL);
4998 static int selinux_tun_dev_attach(struct sock *sk, void *security)
5000 struct tun_security_struct *tunsec = security;
5001 struct sk_security_struct *sksec = sk->sk_security;
5003 /* we don't currently perform any NetLabel based labeling here and it
5004 * isn't clear that we would want to do so anyway; while we could apply
5005 * labeling without the support of the TUN user the resulting labeled
5006 * traffic from the other end of the connection would almost certainly
5007 * cause confusion to the TUN user that had no idea network labeling
5008 * protocols were being used */
5010 sksec->sid = tunsec->sid;
5011 sksec->sclass = SECCLASS_TUN_SOCKET;
5016 static int selinux_tun_dev_open(void *security)
5018 struct tun_security_struct *tunsec = security;
5019 u32 sid = current_sid();
5022 err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET,
5023 TUN_SOCKET__RELABELFROM, NULL);
5026 err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET,
5027 TUN_SOCKET__RELABELTO, NULL);
5035 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
5039 struct nlmsghdr *nlh;
5040 struct sk_security_struct *sksec = sk->sk_security;
5042 if (skb->len < NLMSG_HDRLEN) {
5046 nlh = nlmsg_hdr(skb);
5048 err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
5050 if (err == -EINVAL) {
5051 pr_warn_ratelimited("SELinux: unrecognized netlink"
5052 " message: protocol=%hu nlmsg_type=%hu sclass=%s"
5053 " pig=%d comm=%s\n",
5054 sk->sk_protocol, nlh->nlmsg_type,
5055 secclass_map[sksec->sclass - 1].name,
5056 task_pid_nr(current), current->comm);
5057 if (!selinux_enforcing || security_get_allow_unknown())
5067 err = sock_has_perm(sk, perm);
5072 #ifdef CONFIG_NETFILTER
5074 static unsigned int selinux_ip_forward(struct sk_buff *skb,
5075 const struct net_device *indev,
5081 struct common_audit_data ad;
5082 struct lsm_network_audit net = {0,};
5087 if (!selinux_policycap_netpeer)
5090 secmark_active = selinux_secmark_enabled();
5091 netlbl_active = netlbl_enabled();
5092 peerlbl_active = selinux_peerlbl_enabled();
5093 if (!secmark_active && !peerlbl_active)
5096 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
5099 ad.type = LSM_AUDIT_DATA_NET;
5101 ad.u.net->netif = indev->ifindex;
5102 ad.u.net->family = family;
5103 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
5106 if (peerlbl_active) {
5107 err = selinux_inet_sys_rcv_skb(dev_net(indev), indev->ifindex,
5108 addrp, family, peer_sid, &ad);
5110 selinux_netlbl_err(skb, family, err, 1);
5116 if (avc_has_perm(peer_sid, skb->secmark,
5117 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
5121 /* we do this in the FORWARD path and not the POST_ROUTING
5122 * path because we want to make sure we apply the necessary
5123 * labeling before IPsec is applied so we can leverage AH
5125 if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
5131 static unsigned int selinux_ipv4_forward(void *priv,
5132 struct sk_buff *skb,
5133 const struct nf_hook_state *state)
5135 return selinux_ip_forward(skb, state->in, PF_INET);
5138 #if IS_ENABLED(CONFIG_IPV6)
5139 static unsigned int selinux_ipv6_forward(void *priv,
5140 struct sk_buff *skb,
5141 const struct nf_hook_state *state)
5143 return selinux_ip_forward(skb, state->in, PF_INET6);
5147 static unsigned int selinux_ip_output(struct sk_buff *skb,
5153 if (!netlbl_enabled())
5156 /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
5157 * because we want to make sure we apply the necessary labeling
5158 * before IPsec is applied so we can leverage AH protection */
5161 struct sk_security_struct *sksec;
5163 if (sk_listener(sk))
5164 /* if the socket is the listening state then this
5165 * packet is a SYN-ACK packet which means it needs to
5166 * be labeled based on the connection/request_sock and
5167 * not the parent socket. unfortunately, we can't
5168 * lookup the request_sock yet as it isn't queued on
5169 * the parent socket until after the SYN-ACK is sent.
5170 * the "solution" is to simply pass the packet as-is
5171 * as any IP option based labeling should be copied
5172 * from the initial connection request (in the IP
5173 * layer). it is far from ideal, but until we get a
5174 * security label in the packet itself this is the
5175 * best we can do. */
5178 /* standard practice, label using the parent socket */
5179 sksec = sk->sk_security;
5182 sid = SECINITSID_KERNEL;
5183 if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
5189 static unsigned int selinux_ipv4_output(void *priv,
5190 struct sk_buff *skb,
5191 const struct nf_hook_state *state)
5193 return selinux_ip_output(skb, PF_INET);
5196 #if IS_ENABLED(CONFIG_IPV6)
5197 static unsigned int selinux_ipv6_output(void *priv,
5198 struct sk_buff *skb,
5199 const struct nf_hook_state *state)
5201 return selinux_ip_output(skb, PF_INET6);
5205 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
5209 struct sock *sk = skb_to_full_sk(skb);
5210 struct sk_security_struct *sksec;
5211 struct common_audit_data ad;
5212 struct lsm_network_audit net = {0,};
5218 sksec = sk->sk_security;
5220 ad.type = LSM_AUDIT_DATA_NET;
5222 ad.u.net->netif = ifindex;
5223 ad.u.net->family = family;
5224 if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
5227 if (selinux_secmark_enabled())
5228 if (avc_has_perm(sksec->sid, skb->secmark,
5229 SECCLASS_PACKET, PACKET__SEND, &ad))
5230 return NF_DROP_ERR(-ECONNREFUSED);
5232 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
5233 return NF_DROP_ERR(-ECONNREFUSED);
5238 static unsigned int selinux_ip_postroute(struct sk_buff *skb,
5239 const struct net_device *outdev,
5244 int ifindex = outdev->ifindex;
5246 struct common_audit_data ad;
5247 struct lsm_network_audit net = {0,};
5252 /* If any sort of compatibility mode is enabled then handoff processing
5253 * to the selinux_ip_postroute_compat() function to deal with the
5254 * special handling. We do this in an attempt to keep this function
5255 * as fast and as clean as possible. */
5256 if (!selinux_policycap_netpeer)
5257 return selinux_ip_postroute_compat(skb, ifindex, family);
5259 secmark_active = selinux_secmark_enabled();
5260 peerlbl_active = selinux_peerlbl_enabled();
5261 if (!secmark_active && !peerlbl_active)
5264 sk = skb_to_full_sk(skb);
5267 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
5268 * packet transformation so allow the packet to pass without any checks
5269 * since we'll have another chance to perform access control checks
5270 * when the packet is on it's final way out.
5271 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
5272 * is NULL, in this case go ahead and apply access control.
5273 * NOTE: if this is a local socket (skb->sk != NULL) that is in the
5274 * TCP listening state we cannot wait until the XFRM processing
5275 * is done as we will miss out on the SA label if we do;
5276 * unfortunately, this means more work, but it is only once per
5278 if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL &&
5279 !(sk && sk_listener(sk)))
5284 /* Without an associated socket the packet is either coming
5285 * from the kernel or it is being forwarded; check the packet
5286 * to determine which and if the packet is being forwarded
5287 * query the packet directly to determine the security label. */
5289 secmark_perm = PACKET__FORWARD_OUT;
5290 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
5293 secmark_perm = PACKET__SEND;
5294 peer_sid = SECINITSID_KERNEL;
5296 } else if (sk_listener(sk)) {
5297 /* Locally generated packet but the associated socket is in the
5298 * listening state which means this is a SYN-ACK packet. In
5299 * this particular case the correct security label is assigned
5300 * to the connection/request_sock but unfortunately we can't
5301 * query the request_sock as it isn't queued on the parent
5302 * socket until after the SYN-ACK packet is sent; the only
5303 * viable choice is to regenerate the label like we do in
5304 * selinux_inet_conn_request(). See also selinux_ip_output()
5305 * for similar problems. */
5307 struct sk_security_struct *sksec;
5309 sksec = sk->sk_security;
5310 if (selinux_skb_peerlbl_sid(skb, family, &skb_sid))
5312 /* At this point, if the returned skb peerlbl is SECSID_NULL
5313 * and the packet has been through at least one XFRM
5314 * transformation then we must be dealing with the "final"
5315 * form of labeled IPsec packet; since we've already applied
5316 * all of our access controls on this packet we can safely
5317 * pass the packet. */
5318 if (skb_sid == SECSID_NULL) {
5321 if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
5325 if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
5329 return NF_DROP_ERR(-ECONNREFUSED);
5332 if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid))
5334 secmark_perm = PACKET__SEND;
5336 /* Locally generated packet, fetch the security label from the
5337 * associated socket. */
5338 struct sk_security_struct *sksec = sk->sk_security;
5339 peer_sid = sksec->sid;
5340 secmark_perm = PACKET__SEND;
5343 ad.type = LSM_AUDIT_DATA_NET;
5345 ad.u.net->netif = ifindex;
5346 ad.u.net->family = family;
5347 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
5351 if (avc_has_perm(peer_sid, skb->secmark,
5352 SECCLASS_PACKET, secmark_perm, &ad))
5353 return NF_DROP_ERR(-ECONNREFUSED);
5355 if (peerlbl_active) {
5359 if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid))
5361 if (avc_has_perm(peer_sid, if_sid,
5362 SECCLASS_NETIF, NETIF__EGRESS, &ad))
5363 return NF_DROP_ERR(-ECONNREFUSED);
5365 if (sel_netnode_sid(addrp, family, &node_sid))
5367 if (avc_has_perm(peer_sid, node_sid,
5368 SECCLASS_NODE, NODE__SENDTO, &ad))
5369 return NF_DROP_ERR(-ECONNREFUSED);
5375 static unsigned int selinux_ipv4_postroute(void *priv,
5376 struct sk_buff *skb,
5377 const struct nf_hook_state *state)
5379 return selinux_ip_postroute(skb, state->out, PF_INET);
5382 #if IS_ENABLED(CONFIG_IPV6)
5383 static unsigned int selinux_ipv6_postroute(void *priv,
5384 struct sk_buff *skb,
5385 const struct nf_hook_state *state)
5387 return selinux_ip_postroute(skb, state->out, PF_INET6);
5391 #endif /* CONFIG_NETFILTER */
5393 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
5395 return selinux_nlmsg_perm(sk, skb);
5398 static int ipc_alloc_security(struct kern_ipc_perm *perm,
5401 struct ipc_security_struct *isec;
5403 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
5407 isec->sclass = sclass;
5408 isec->sid = current_sid();
5409 perm->security = isec;
5414 static void ipc_free_security(struct kern_ipc_perm *perm)
5416 struct ipc_security_struct *isec = perm->security;
5417 perm->security = NULL;
5421 static int msg_msg_alloc_security(struct msg_msg *msg)
5423 struct msg_security_struct *msec;
5425 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
5429 msec->sid = SECINITSID_UNLABELED;
5430 msg->security = msec;
5435 static void msg_msg_free_security(struct msg_msg *msg)
5437 struct msg_security_struct *msec = msg->security;
5439 msg->security = NULL;
5443 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
5446 struct ipc_security_struct *isec;
5447 struct common_audit_data ad;
5448 u32 sid = current_sid();
5450 isec = ipc_perms->security;
5452 ad.type = LSM_AUDIT_DATA_IPC;
5453 ad.u.ipc_id = ipc_perms->key;
5455 return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
5458 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
5460 return msg_msg_alloc_security(msg);
5463 static void selinux_msg_msg_free_security(struct msg_msg *msg)
5465 msg_msg_free_security(msg);
5468 /* message queue security operations */
5469 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
5471 struct ipc_security_struct *isec;
5472 struct common_audit_data ad;
5473 u32 sid = current_sid();
5476 rc = ipc_alloc_security(&msq->q_perm, SECCLASS_MSGQ);
5480 isec = msq->q_perm.security;
5482 ad.type = LSM_AUDIT_DATA_IPC;
5483 ad.u.ipc_id = msq->q_perm.key;
5485 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
5488 ipc_free_security(&msq->q_perm);
5494 static void selinux_msg_queue_free_security(struct msg_queue *msq)
5496 ipc_free_security(&msq->q_perm);
5499 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
5501 struct ipc_security_struct *isec;
5502 struct common_audit_data ad;
5503 u32 sid = current_sid();
5505 isec = msq->q_perm.security;
5507 ad.type = LSM_AUDIT_DATA_IPC;
5508 ad.u.ipc_id = msq->q_perm.key;
5510 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
5511 MSGQ__ASSOCIATE, &ad);
5514 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
5522 /* No specific object, just general system-wide information. */
5523 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
5524 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
5527 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
5530 perms = MSGQ__SETATTR;
5533 perms = MSGQ__DESTROY;
5539 err = ipc_has_perm(&msq->q_perm, perms);
5543 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
5545 struct ipc_security_struct *isec;
5546 struct msg_security_struct *msec;
5547 struct common_audit_data ad;
5548 u32 sid = current_sid();
5551 isec = msq->q_perm.security;
5552 msec = msg->security;
5555 * First time through, need to assign label to the message
5557 if (msec->sid == SECINITSID_UNLABELED) {
5559 * Compute new sid based on current process and
5560 * message queue this message will be stored in
5562 rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
5568 ad.type = LSM_AUDIT_DATA_IPC;
5569 ad.u.ipc_id = msq->q_perm.key;
5571 /* Can this process write to the queue? */
5572 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
5575 /* Can this process send the message */
5576 rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
5579 /* Can the message be put in the queue? */
5580 rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
5581 MSGQ__ENQUEUE, &ad);
5586 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
5587 struct task_struct *target,
5588 long type, int mode)
5590 struct ipc_security_struct *isec;
5591 struct msg_security_struct *msec;
5592 struct common_audit_data ad;
5593 u32 sid = task_sid(target);
5596 isec = msq->q_perm.security;
5597 msec = msg->security;
5599 ad.type = LSM_AUDIT_DATA_IPC;
5600 ad.u.ipc_id = msq->q_perm.key;
5602 rc = avc_has_perm(sid, isec->sid,
5603 SECCLASS_MSGQ, MSGQ__READ, &ad);
5605 rc = avc_has_perm(sid, msec->sid,
5606 SECCLASS_MSG, MSG__RECEIVE, &ad);
5610 /* Shared Memory security operations */
5611 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
5613 struct ipc_security_struct *isec;
5614 struct common_audit_data ad;
5615 u32 sid = current_sid();
5618 rc = ipc_alloc_security(&shp->shm_perm, SECCLASS_SHM);
5622 isec = shp->shm_perm.security;
5624 ad.type = LSM_AUDIT_DATA_IPC;
5625 ad.u.ipc_id = shp->shm_perm.key;
5627 rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM,
5630 ipc_free_security(&shp->shm_perm);
5636 static void selinux_shm_free_security(struct shmid_kernel *shp)
5638 ipc_free_security(&shp->shm_perm);
5641 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
5643 struct ipc_security_struct *isec;
5644 struct common_audit_data ad;
5645 u32 sid = current_sid();
5647 isec = shp->shm_perm.security;
5649 ad.type = LSM_AUDIT_DATA_IPC;
5650 ad.u.ipc_id = shp->shm_perm.key;
5652 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
5653 SHM__ASSOCIATE, &ad);
5656 /* Note, at this point, shp is locked down */
5657 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
5665 /* No specific object, just general system-wide information. */
5666 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
5667 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
5670 perms = SHM__GETATTR | SHM__ASSOCIATE;
5673 perms = SHM__SETATTR;
5680 perms = SHM__DESTROY;
5686 err = ipc_has_perm(&shp->shm_perm, perms);
5690 static int selinux_shm_shmat(struct shmid_kernel *shp,
5691 char __user *shmaddr, int shmflg)
5695 if (shmflg & SHM_RDONLY)
5698 perms = SHM__READ | SHM__WRITE;
5700 return ipc_has_perm(&shp->shm_perm, perms);
5703 /* Semaphore security operations */
5704 static int selinux_sem_alloc_security(struct sem_array *sma)
5706 struct ipc_security_struct *isec;
5707 struct common_audit_data ad;
5708 u32 sid = current_sid();
5711 rc = ipc_alloc_security(&sma->sem_perm, SECCLASS_SEM);
5715 isec = sma->sem_perm.security;
5717 ad.type = LSM_AUDIT_DATA_IPC;
5718 ad.u.ipc_id = sma->sem_perm.key;
5720 rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
5723 ipc_free_security(&sma->sem_perm);
5729 static void selinux_sem_free_security(struct sem_array *sma)
5731 ipc_free_security(&sma->sem_perm);
5734 static int selinux_sem_associate(struct sem_array *sma, int semflg)
5736 struct ipc_security_struct *isec;
5737 struct common_audit_data ad;
5738 u32 sid = current_sid();
5740 isec = sma->sem_perm.security;
5742 ad.type = LSM_AUDIT_DATA_IPC;
5743 ad.u.ipc_id = sma->sem_perm.key;
5745 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
5746 SEM__ASSOCIATE, &ad);
5749 /* Note, at this point, sma is locked down */
5750 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
5758 /* No specific object, just general system-wide information. */
5759 return avc_has_perm(current_sid(), SECINITSID_KERNEL,
5760 SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
5764 perms = SEM__GETATTR;
5775 perms = SEM__DESTROY;
5778 perms = SEM__SETATTR;
5782 perms = SEM__GETATTR | SEM__ASSOCIATE;
5788 err = ipc_has_perm(&sma->sem_perm, perms);
5792 static int selinux_sem_semop(struct sem_array *sma,
5793 struct sembuf *sops, unsigned nsops, int alter)
5798 perms = SEM__READ | SEM__WRITE;
5802 return ipc_has_perm(&sma->sem_perm, perms);
5805 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
5811 av |= IPC__UNIX_READ;
5813 av |= IPC__UNIX_WRITE;
5818 return ipc_has_perm(ipcp, av);
5821 static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
5823 struct ipc_security_struct *isec = ipcp->security;
5827 static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
5830 inode_doinit_with_dentry(inode, dentry);
5833 static int selinux_getprocattr(struct task_struct *p,
5834 char *name, char **value)
5836 const struct task_security_struct *__tsec;
5842 __tsec = __task_cred(p)->security;
5845 error = avc_has_perm(current_sid(), __tsec->sid,
5846 SECCLASS_PROCESS, PROCESS__GETATTR, NULL);
5851 if (!strcmp(name, "current"))
5853 else if (!strcmp(name, "prev"))
5855 else if (!strcmp(name, "exec"))
5856 sid = __tsec->exec_sid;
5857 else if (!strcmp(name, "fscreate"))
5858 sid = __tsec->create_sid;
5859 else if (!strcmp(name, "keycreate"))
5860 sid = __tsec->keycreate_sid;
5861 else if (!strcmp(name, "sockcreate"))
5862 sid = __tsec->sockcreate_sid;
5872 error = security_sid_to_context(sid, value, &len);
5882 static int selinux_setprocattr(const char *name, void *value, size_t size)
5884 struct task_security_struct *tsec;
5886 u32 mysid = current_sid(), sid = 0, ptsid;
5891 * Basic control over ability to set these attributes at all.
5893 if (!strcmp(name, "exec"))
5894 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
5895 PROCESS__SETEXEC, NULL);
5896 else if (!strcmp(name, "fscreate"))
5897 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
5898 PROCESS__SETFSCREATE, NULL);
5899 else if (!strcmp(name, "keycreate"))
5900 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
5901 PROCESS__SETKEYCREATE, NULL);
5902 else if (!strcmp(name, "sockcreate"))
5903 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
5904 PROCESS__SETSOCKCREATE, NULL);
5905 else if (!strcmp(name, "current"))
5906 error = avc_has_perm(mysid, mysid, SECCLASS_PROCESS,
5907 PROCESS__SETCURRENT, NULL);
5913 /* Obtain a SID for the context, if one was specified. */
5914 if (size && str[0] && str[0] != '\n') {
5915 if (str[size-1] == '\n') {
5919 error = security_context_to_sid(value, size, &sid, GFP_KERNEL);
5920 if (error == -EINVAL && !strcmp(name, "fscreate")) {
5921 if (!capable(CAP_MAC_ADMIN)) {
5922 struct audit_buffer *ab;
5925 /* We strip a nul only if it is at the end, otherwise the
5926 * context contains a nul and we should audit that */
5927 if (str[size - 1] == '\0')
5928 audit_size = size - 1;
5931 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
5932 audit_log_format(ab, "op=fscreate invalid_context=");
5933 audit_log_n_untrustedstring(ab, value, audit_size);
5938 error = security_context_to_sid_force(value, size,
5945 new = prepare_creds();
5949 /* Permission checking based on the specified context is
5950 performed during the actual operation (execve,
5951 open/mkdir/...), when we know the full context of the
5952 operation. See selinux_bprm_set_creds for the execve
5953 checks and may_create for the file creation checks. The
5954 operation will then fail if the context is not permitted. */
5955 tsec = new->security;
5956 if (!strcmp(name, "exec")) {
5957 tsec->exec_sid = sid;
5958 } else if (!strcmp(name, "fscreate")) {
5959 tsec->create_sid = sid;
5960 } else if (!strcmp(name, "keycreate")) {
5961 error = avc_has_perm(mysid, sid, SECCLASS_KEY, KEY__CREATE,
5965 tsec->keycreate_sid = sid;
5966 } else if (!strcmp(name, "sockcreate")) {
5967 tsec->sockcreate_sid = sid;
5968 } else if (!strcmp(name, "current")) {
5973 /* Only allow single threaded processes to change context */
5975 if (!current_is_single_threaded()) {
5976 error = security_bounded_transition(tsec->sid, sid);
5981 /* Check permissions for the transition. */
5982 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
5983 PROCESS__DYNTRANSITION, NULL);
5987 /* Check for ptracing, and update the task SID if ok.
5988 Otherwise, leave SID unchanged and fail. */
5989 ptsid = ptrace_parent_sid();
5991 error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
5992 PROCESS__PTRACE, NULL);
6011 static int selinux_ismaclabel(const char *name)
6013 return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0);
6016 static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
6018 return security_sid_to_context(secid, secdata, seclen);
6021 static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
6023 return security_context_to_sid(secdata, seclen, secid, GFP_KERNEL);
6026 static void selinux_release_secctx(char *secdata, u32 seclen)
6031 static void selinux_inode_invalidate_secctx(struct inode *inode)
6033 struct inode_security_struct *isec = inode->i_security;
6035 spin_lock(&isec->lock);
6036 isec->initialized = LABEL_INVALID;
6037 spin_unlock(&isec->lock);
6041 * called with inode->i_mutex locked
6043 static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
6045 return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0);
6049 * called with inode->i_mutex locked
6051 static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
6053 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0);
6056 static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
6059 len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX,
6068 static int selinux_key_alloc(struct key *k, const struct cred *cred,
6069 unsigned long flags)
6071 const struct task_security_struct *tsec;
6072 struct key_security_struct *ksec;
6074 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
6078 tsec = cred->security;
6079 if (tsec->keycreate_sid)
6080 ksec->sid = tsec->keycreate_sid;
6082 ksec->sid = tsec->sid;
6088 static void selinux_key_free(struct key *k)
6090 struct key_security_struct *ksec = k->security;
6096 static int selinux_key_permission(key_ref_t key_ref,
6097 const struct cred *cred,
6101 struct key_security_struct *ksec;
6104 /* if no specific permissions are requested, we skip the
6105 permission check. No serious, additional covert channels
6106 appear to be created. */
6110 sid = cred_sid(cred);
6112 key = key_ref_to_ptr(key_ref);
6113 ksec = key->security;
6115 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
6118 static int selinux_key_getsecurity(struct key *key, char **_buffer)
6120 struct key_security_struct *ksec = key->security;
6121 char *context = NULL;
6125 rc = security_sid_to_context(ksec->sid, &context, &len);
6134 static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
6135 LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr),
6136 LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction),
6137 LSM_HOOK_INIT(binder_transfer_binder, selinux_binder_transfer_binder),
6138 LSM_HOOK_INIT(binder_transfer_file, selinux_binder_transfer_file),
6140 LSM_HOOK_INIT(ptrace_access_check, selinux_ptrace_access_check),
6141 LSM_HOOK_INIT(ptrace_traceme, selinux_ptrace_traceme),
6142 LSM_HOOK_INIT(capget, selinux_capget),
6143 LSM_HOOK_INIT(capset, selinux_capset),
6144 LSM_HOOK_INIT(capable, selinux_capable),
6145 LSM_HOOK_INIT(quotactl, selinux_quotactl),
6146 LSM_HOOK_INIT(quota_on, selinux_quota_on),
6147 LSM_HOOK_INIT(syslog, selinux_syslog),
6148 LSM_HOOK_INIT(vm_enough_memory, selinux_vm_enough_memory),
6150 LSM_HOOK_INIT(netlink_send, selinux_netlink_send),
6152 LSM_HOOK_INIT(bprm_set_creds, selinux_bprm_set_creds),
6153 LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds),
6154 LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds),
6155 LSM_HOOK_INIT(bprm_secureexec, selinux_bprm_secureexec),
6157 LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security),
6158 LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
6159 LSM_HOOK_INIT(sb_copy_data, selinux_sb_copy_data),
6160 LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
6161 LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
6162 LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
6163 LSM_HOOK_INIT(sb_statfs, selinux_sb_statfs),
6164 LSM_HOOK_INIT(sb_mount, selinux_mount),
6165 LSM_HOOK_INIT(sb_umount, selinux_umount),
6166 LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts),
6167 LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts),
6168 LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str),
6170 LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
6171 LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
6173 LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security),
6174 LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),
6175 LSM_HOOK_INIT(inode_init_security, selinux_inode_init_security),
6176 LSM_HOOK_INIT(inode_create, selinux_inode_create),
6177 LSM_HOOK_INIT(inode_link, selinux_inode_link),
6178 LSM_HOOK_INIT(inode_unlink, selinux_inode_unlink),
6179 LSM_HOOK_INIT(inode_symlink, selinux_inode_symlink),
6180 LSM_HOOK_INIT(inode_mkdir, selinux_inode_mkdir),
6181 LSM_HOOK_INIT(inode_rmdir, selinux_inode_rmdir),
6182 LSM_HOOK_INIT(inode_mknod, selinux_inode_mknod),
6183 LSM_HOOK_INIT(inode_rename, selinux_inode_rename),
6184 LSM_HOOK_INIT(inode_readlink, selinux_inode_readlink),
6185 LSM_HOOK_INIT(inode_follow_link, selinux_inode_follow_link),
6186 LSM_HOOK_INIT(inode_permission, selinux_inode_permission),
6187 LSM_HOOK_INIT(inode_setattr, selinux_inode_setattr),
6188 LSM_HOOK_INIT(inode_getattr, selinux_inode_getattr),
6189 LSM_HOOK_INIT(inode_setxattr, selinux_inode_setxattr),
6190 LSM_HOOK_INIT(inode_post_setxattr, selinux_inode_post_setxattr),
6191 LSM_HOOK_INIT(inode_getxattr, selinux_inode_getxattr),
6192 LSM_HOOK_INIT(inode_listxattr, selinux_inode_listxattr),
6193 LSM_HOOK_INIT(inode_removexattr, selinux_inode_removexattr),
6194 LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity),
6195 LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity),
6196 LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity),
6197 LSM_HOOK_INIT(inode_getsecid, selinux_inode_getsecid),
6198 LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
6199 LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr),
6201 LSM_HOOK_INIT(file_permission, selinux_file_permission),
6202 LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
6203 LSM_HOOK_INIT(file_free_security, selinux_file_free_security),
6204 LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl),
6205 LSM_HOOK_INIT(mmap_file, selinux_mmap_file),
6206 LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr),
6207 LSM_HOOK_INIT(file_mprotect, selinux_file_mprotect),
6208 LSM_HOOK_INIT(file_lock, selinux_file_lock),
6209 LSM_HOOK_INIT(file_fcntl, selinux_file_fcntl),
6210 LSM_HOOK_INIT(file_set_fowner, selinux_file_set_fowner),
6211 LSM_HOOK_INIT(file_send_sigiotask, selinux_file_send_sigiotask),
6212 LSM_HOOK_INIT(file_receive, selinux_file_receive),
6214 LSM_HOOK_INIT(file_open, selinux_file_open),
6216 LSM_HOOK_INIT(task_create, selinux_task_create),
6217 LSM_HOOK_INIT(cred_alloc_blank, selinux_cred_alloc_blank),
6218 LSM_HOOK_INIT(cred_free, selinux_cred_free),
6219 LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare),
6220 LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer),
6221 LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as),
6222 LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as),
6223 LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request),
6224 LSM_HOOK_INIT(kernel_read_file, selinux_kernel_read_file),
6225 LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid),
6226 LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid),
6227 LSM_HOOK_INIT(task_getsid, selinux_task_getsid),
6228 LSM_HOOK_INIT(task_getsecid, selinux_task_getsecid),
6229 LSM_HOOK_INIT(task_setnice, selinux_task_setnice),
6230 LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio),
6231 LSM_HOOK_INIT(task_getioprio, selinux_task_getioprio),
6232 LSM_HOOK_INIT(task_prlimit, selinux_task_prlimit),
6233 LSM_HOOK_INIT(task_setrlimit, selinux_task_setrlimit),
6234 LSM_HOOK_INIT(task_setscheduler, selinux_task_setscheduler),
6235 LSM_HOOK_INIT(task_getscheduler, selinux_task_getscheduler),
6236 LSM_HOOK_INIT(task_movememory, selinux_task_movememory),
6237 LSM_HOOK_INIT(task_kill, selinux_task_kill),
6238 LSM_HOOK_INIT(task_to_inode, selinux_task_to_inode),
6240 LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission),
6241 LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid),
6243 LSM_HOOK_INIT(msg_msg_alloc_security, selinux_msg_msg_alloc_security),
6244 LSM_HOOK_INIT(msg_msg_free_security, selinux_msg_msg_free_security),
6246 LSM_HOOK_INIT(msg_queue_alloc_security,
6247 selinux_msg_queue_alloc_security),
6248 LSM_HOOK_INIT(msg_queue_free_security, selinux_msg_queue_free_security),
6249 LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate),
6250 LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl),
6251 LSM_HOOK_INIT(msg_queue_msgsnd, selinux_msg_queue_msgsnd),
6252 LSM_HOOK_INIT(msg_queue_msgrcv, selinux_msg_queue_msgrcv),
6254 LSM_HOOK_INIT(shm_alloc_security, selinux_shm_alloc_security),
6255 LSM_HOOK_INIT(shm_free_security, selinux_shm_free_security),
6256 LSM_HOOK_INIT(shm_associate, selinux_shm_associate),
6257 LSM_HOOK_INIT(shm_shmctl, selinux_shm_shmctl),
6258 LSM_HOOK_INIT(shm_shmat, selinux_shm_shmat),
6260 LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security),
6261 LSM_HOOK_INIT(sem_free_security, selinux_sem_free_security),
6262 LSM_HOOK_INIT(sem_associate, selinux_sem_associate),
6263 LSM_HOOK_INIT(sem_semctl, selinux_sem_semctl),
6264 LSM_HOOK_INIT(sem_semop, selinux_sem_semop),
6266 LSM_HOOK_INIT(d_instantiate, selinux_d_instantiate),
6268 LSM_HOOK_INIT(getprocattr, selinux_getprocattr),
6269 LSM_HOOK_INIT(setprocattr, selinux_setprocattr),
6271 LSM_HOOK_INIT(ismaclabel, selinux_ismaclabel),
6272 LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx),
6273 LSM_HOOK_INIT(secctx_to_secid, selinux_secctx_to_secid),
6274 LSM_HOOK_INIT(release_secctx, selinux_release_secctx),
6275 LSM_HOOK_INIT(inode_invalidate_secctx, selinux_inode_invalidate_secctx),
6276 LSM_HOOK_INIT(inode_notifysecctx, selinux_inode_notifysecctx),
6277 LSM_HOOK_INIT(inode_setsecctx, selinux_inode_setsecctx),
6278 LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx),
6280 LSM_HOOK_INIT(unix_stream_connect, selinux_socket_unix_stream_connect),
6281 LSM_HOOK_INIT(unix_may_send, selinux_socket_unix_may_send),
6283 LSM_HOOK_INIT(socket_create, selinux_socket_create),
6284 LSM_HOOK_INIT(socket_post_create, selinux_socket_post_create),
6285 LSM_HOOK_INIT(socket_bind, selinux_socket_bind),
6286 LSM_HOOK_INIT(socket_connect, selinux_socket_connect),
6287 LSM_HOOK_INIT(socket_listen, selinux_socket_listen),
6288 LSM_HOOK_INIT(socket_accept, selinux_socket_accept),
6289 LSM_HOOK_INIT(socket_sendmsg, selinux_socket_sendmsg),
6290 LSM_HOOK_INIT(socket_recvmsg, selinux_socket_recvmsg),
6291 LSM_HOOK_INIT(socket_getsockname, selinux_socket_getsockname),
6292 LSM_HOOK_INIT(socket_getpeername, selinux_socket_getpeername),
6293 LSM_HOOK_INIT(socket_getsockopt, selinux_socket_getsockopt),
6294 LSM_HOOK_INIT(socket_setsockopt, selinux_socket_setsockopt),
6295 LSM_HOOK_INIT(socket_shutdown, selinux_socket_shutdown),
6296 LSM_HOOK_INIT(socket_sock_rcv_skb, selinux_socket_sock_rcv_skb),
6297 LSM_HOOK_INIT(socket_getpeersec_stream,
6298 selinux_socket_getpeersec_stream),
6299 LSM_HOOK_INIT(socket_getpeersec_dgram, selinux_socket_getpeersec_dgram),
6300 LSM_HOOK_INIT(sk_alloc_security, selinux_sk_alloc_security),
6301 LSM_HOOK_INIT(sk_free_security, selinux_sk_free_security),
6302 LSM_HOOK_INIT(sk_clone_security, selinux_sk_clone_security),
6303 LSM_HOOK_INIT(sk_getsecid, selinux_sk_getsecid),
6304 LSM_HOOK_INIT(sock_graft, selinux_sock_graft),
6305 LSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request),
6306 LSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone),
6307 LSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established),
6308 LSM_HOOK_INIT(secmark_relabel_packet, selinux_secmark_relabel_packet),
6309 LSM_HOOK_INIT(secmark_refcount_inc, selinux_secmark_refcount_inc),
6310 LSM_HOOK_INIT(secmark_refcount_dec, selinux_secmark_refcount_dec),
6311 LSM_HOOK_INIT(req_classify_flow, selinux_req_classify_flow),
6312 LSM_HOOK_INIT(tun_dev_alloc_security, selinux_tun_dev_alloc_security),
6313 LSM_HOOK_INIT(tun_dev_free_security, selinux_tun_dev_free_security),
6314 LSM_HOOK_INIT(tun_dev_create, selinux_tun_dev_create),
6315 LSM_HOOK_INIT(tun_dev_attach_queue, selinux_tun_dev_attach_queue),
6316 LSM_HOOK_INIT(tun_dev_attach, selinux_tun_dev_attach),
6317 LSM_HOOK_INIT(tun_dev_open, selinux_tun_dev_open),
6319 #ifdef CONFIG_SECURITY_NETWORK_XFRM
6320 LSM_HOOK_INIT(xfrm_policy_alloc_security, selinux_xfrm_policy_alloc),
6321 LSM_HOOK_INIT(xfrm_policy_clone_security, selinux_xfrm_policy_clone),
6322 LSM_HOOK_INIT(xfrm_policy_free_security, selinux_xfrm_policy_free),
6323 LSM_HOOK_INIT(xfrm_policy_delete_security, selinux_xfrm_policy_delete),
6324 LSM_HOOK_INIT(xfrm_state_alloc, selinux_xfrm_state_alloc),
6325 LSM_HOOK_INIT(xfrm_state_alloc_acquire,
6326 selinux_xfrm_state_alloc_acquire),
6327 LSM_HOOK_INIT(xfrm_state_free_security, selinux_xfrm_state_free),
6328 LSM_HOOK_INIT(xfrm_state_delete_security, selinux_xfrm_state_delete),
6329 LSM_HOOK_INIT(xfrm_policy_lookup, selinux_xfrm_policy_lookup),
6330 LSM_HOOK_INIT(xfrm_state_pol_flow_match,
6331 selinux_xfrm_state_pol_flow_match),
6332 LSM_HOOK_INIT(xfrm_decode_session, selinux_xfrm_decode_session),
6336 LSM_HOOK_INIT(key_alloc, selinux_key_alloc),
6337 LSM_HOOK_INIT(key_free, selinux_key_free),
6338 LSM_HOOK_INIT(key_permission, selinux_key_permission),
6339 LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
6343 LSM_HOOK_INIT(audit_rule_init, selinux_audit_rule_init),
6344 LSM_HOOK_INIT(audit_rule_known, selinux_audit_rule_known),
6345 LSM_HOOK_INIT(audit_rule_match, selinux_audit_rule_match),
6346 LSM_HOOK_INIT(audit_rule_free, selinux_audit_rule_free),
6350 static __init int selinux_init(void)
6352 if (!security_module_enable("selinux")) {
6353 selinux_enabled = 0;
6357 if (!selinux_enabled) {
6358 printk(KERN_INFO "SELinux: Disabled at boot.\n");
6362 printk(KERN_INFO "SELinux: Initializing.\n");
6364 /* Set the security state for the initial task. */
6365 cred_init_security();
6367 default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
6369 sel_inode_cache = kmem_cache_create("selinux_inode_security",
6370 sizeof(struct inode_security_struct),
6371 0, SLAB_PANIC, NULL);
6372 file_security_cache = kmem_cache_create("selinux_file_security",
6373 sizeof(struct file_security_struct),
6374 0, SLAB_PANIC, NULL);
6377 security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), "selinux");
6379 if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
6380 panic("SELinux: Unable to register AVC netcache callback\n");
6382 if (selinux_enforcing)
6383 printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
6385 printk(KERN_DEBUG "SELinux: Starting in permissive mode\n");
6390 static void delayed_superblock_init(struct super_block *sb, void *unused)
6392 superblock_doinit(sb, NULL);
6395 void selinux_complete_init(void)
6397 printk(KERN_DEBUG "SELinux: Completing initialization.\n");
6399 /* Set up any superblocks initialized prior to the policy load. */
6400 printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n");
6401 iterate_supers(delayed_superblock_init, NULL);
6404 /* SELinux requires early initialization in order to label
6405 all processes and objects when they are created. */
6406 security_initcall(selinux_init);
6408 #if defined(CONFIG_NETFILTER)
6410 static struct nf_hook_ops selinux_nf_ops[] = {
6412 .hook = selinux_ipv4_postroute,
6414 .hooknum = NF_INET_POST_ROUTING,
6415 .priority = NF_IP_PRI_SELINUX_LAST,
6418 .hook = selinux_ipv4_forward,
6420 .hooknum = NF_INET_FORWARD,
6421 .priority = NF_IP_PRI_SELINUX_FIRST,
6424 .hook = selinux_ipv4_output,
6426 .hooknum = NF_INET_LOCAL_OUT,
6427 .priority = NF_IP_PRI_SELINUX_FIRST,
6429 #if IS_ENABLED(CONFIG_IPV6)
6431 .hook = selinux_ipv6_postroute,
6433 .hooknum = NF_INET_POST_ROUTING,
6434 .priority = NF_IP6_PRI_SELINUX_LAST,
6437 .hook = selinux_ipv6_forward,
6439 .hooknum = NF_INET_FORWARD,
6440 .priority = NF_IP6_PRI_SELINUX_FIRST,
6443 .hook = selinux_ipv6_output,
6445 .hooknum = NF_INET_LOCAL_OUT,
6446 .priority = NF_IP6_PRI_SELINUX_FIRST,
6451 static int __init selinux_nf_ip_init(void)
6455 if (!selinux_enabled)
6458 printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
6460 err = nf_register_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
6462 panic("SELinux: nf_register_hooks: error %d\n", err);
6467 __initcall(selinux_nf_ip_init);
6469 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6470 static void selinux_nf_ip_exit(void)
6472 printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
6474 nf_unregister_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
6478 #else /* CONFIG_NETFILTER */
6480 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6481 #define selinux_nf_ip_exit()
6484 #endif /* CONFIG_NETFILTER */
6486 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
6487 static int selinux_disabled;
6489 int selinux_disable(void)
6491 if (ss_initialized) {
6492 /* Not permitted after initial policy load. */
6496 if (selinux_disabled) {
6497 /* Only do this once. */
6501 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
6503 selinux_disabled = 1;
6504 selinux_enabled = 0;
6506 security_delete_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks));
6508 /* Try to destroy the avc node cache */
6511 /* Unregister netfilter hooks. */
6512 selinux_nf_ip_exit();
6514 /* Unregister selinuxfs. */