1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
4 * Added conditional policy language extensions
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
8 * Added support for the policy capability bitmap
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
15 #include <linux/kernel.h>
16 #include <linux/pagemap.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
20 #include <linux/fs_context.h>
21 #include <linux/mount.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
42 #include "conditional.h"
46 SEL_LOAD, /* load policy */
47 SEL_ENFORCE, /* get or set enforcing status */
48 SEL_CONTEXT, /* validate context */
49 SEL_ACCESS, /* compute access decision */
50 SEL_CREATE, /* compute create labeling decision */
51 SEL_RELABEL, /* compute relabeling decision */
52 SEL_USER, /* compute reachable user contexts */
53 SEL_POLICYVERS, /* return policy version for this kernel */
54 SEL_COMMIT_BOOLS, /* commit new boolean values */
55 SEL_MLS, /* return if MLS policy is enabled */
56 SEL_DISABLE, /* disable SELinux until next reboot */
57 SEL_MEMBER, /* compute polyinstantiation membership decision */
58 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
59 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
60 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
61 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
62 SEL_STATUS, /* export current status using mmap() */
63 SEL_POLICY, /* allow userspace to read the in kernel policy */
64 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
65 SEL_INO_NEXT, /* The next inode number to use */
68 struct selinux_fs_info {
69 struct dentry *bool_dir;
70 unsigned int bool_num;
71 char **bool_pending_names;
72 unsigned int *bool_pending_values;
73 struct dentry *class_dir;
74 unsigned long last_class_ino;
76 struct dentry *policycap_dir;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
83 static int selinux_fs_info_create(struct super_block *sb)
85 struct selinux_fs_info *fsi;
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
91 mutex_init(&fsi->mutex);
92 fsi->last_ino = SEL_INO_NEXT - 1;
93 fsi->state = &selinux_state;
99 static void selinux_fs_info_free(struct super_block *sb)
101 struct selinux_fs_info *fsi = sb->s_fs_info;
105 for (i = 0; i < fsi->bool_num; i++)
106 kfree(fsi->bool_pending_names[i]);
107 kfree(fsi->bool_pending_names);
108 kfree(fsi->bool_pending_values);
110 kfree(sb->s_fs_info);
111 sb->s_fs_info = NULL;
114 #define SEL_INITCON_INO_OFFSET 0x01000000
115 #define SEL_BOOL_INO_OFFSET 0x02000000
116 #define SEL_CLASS_INO_OFFSET 0x04000000
117 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
118 #define SEL_INO_MASK 0x00ffffff
121 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
122 size_t count, loff_t *ppos)
124 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
125 char tmpbuf[TMPBUFLEN];
128 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
129 enforcing_enabled(fsi->state));
130 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
133 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
134 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
135 size_t count, loff_t *ppos)
138 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
139 struct selinux_state *state = fsi->state;
142 int old_value, new_value;
144 if (count >= PAGE_SIZE)
147 /* No partial writes. */
151 page = memdup_user_nul(buf, count);
153 return PTR_ERR(page);
156 if (sscanf(page, "%d", &new_value) != 1)
159 new_value = !!new_value;
161 old_value = enforcing_enabled(state);
162 if (new_value != old_value) {
163 length = avc_has_perm(&selinux_state,
164 current_sid(), SECINITSID_SECURITY,
165 SECCLASS_SECURITY, SECURITY__SETENFORCE,
169 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
171 " enabled=1 old-enabled=1 lsm=selinux res=1",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 enforcing_set(state, new_value);
177 avc_ss_reset(state->avc, 0);
178 selnl_notify_setenforce(new_value);
179 selinux_status_update_setenforce(state, new_value);
181 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
189 #define sel_write_enforce NULL
192 static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
198 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
201 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
202 struct selinux_state *state = fsi->state;
203 char tmpbuf[TMPBUFLEN];
205 ino_t ino = file_inode(filp)->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown(state) :
208 !security_get_allow_unknown(state);
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
214 static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
219 static int sel_open_handle_status(struct inode *inode, struct file *filp)
221 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
222 struct page *status = selinux_kernel_status_page(fsi->state);
227 filp->private_data = status;
232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
235 struct page *status = filp->private_data;
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
244 static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
261 return remap_pfn_range(vma, vma->vm_start,
263 size, vma->vm_page_prot);
266 static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
278 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
284 /* NOTE: we are now officially considering runtime disable as
285 * deprecated, and using it will become increasingly painful
286 * (e.g. sleeping/blocking) as we progress through future
287 * kernel releases until eventually it is removed
289 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
291 if (count >= PAGE_SIZE)
294 /* No partial writes. */
298 page = memdup_user_nul(buf, count);
300 return PTR_ERR(page);
303 if (sscanf(page, "%d", &new_value) != 1)
307 enforcing = enforcing_enabled(fsi->state);
308 length = selinux_disable(fsi->state);
311 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
312 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
313 " enabled=0 old-enabled=1 lsm=selinux res=1",
314 enforcing, enforcing,
315 from_kuid(&init_user_ns, audit_get_loginuid(current)),
316 audit_get_sessionid(current));
325 #define sel_write_disable NULL
328 static const struct file_operations sel_disable_ops = {
329 .write = sel_write_disable,
330 .llseek = generic_file_llseek,
333 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
334 size_t count, loff_t *ppos)
336 char tmpbuf[TMPBUFLEN];
339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
343 static const struct file_operations sel_policyvers_ops = {
344 .read = sel_read_policyvers,
345 .llseek = generic_file_llseek,
348 /* declaration for sel_write_load */
349 static int sel_make_bools(struct selinux_fs_info *fsi);
350 static int sel_make_classes(struct selinux_fs_info *fsi);
351 static int sel_make_policycap(struct selinux_fs_info *fsi);
353 /* declaration for sel_make_class_dirs */
354 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
357 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
358 size_t count, loff_t *ppos)
360 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
361 char tmpbuf[TMPBUFLEN];
364 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
365 security_mls_enabled(fsi->state));
366 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
369 static const struct file_operations sel_mls_ops = {
370 .read = sel_read_mls,
371 .llseek = generic_file_llseek,
374 struct policy_load_memory {
379 static int sel_open_policy(struct inode *inode, struct file *filp)
381 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
382 struct selinux_state *state = fsi->state;
383 struct policy_load_memory *plm = NULL;
386 BUG_ON(filp->private_data);
388 mutex_lock(&fsi->mutex);
390 rc = avc_has_perm(&selinux_state,
391 current_sid(), SECINITSID_SECURITY,
392 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
397 if (fsi->policy_opened)
401 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
405 if (i_size_read(inode) != security_policydb_len(state)) {
407 i_size_write(inode, security_policydb_len(state));
411 rc = security_read_policy(state, &plm->data, &plm->len);
415 fsi->policy_opened = 1;
417 filp->private_data = plm;
419 mutex_unlock(&fsi->mutex);
423 mutex_unlock(&fsi->mutex);
431 static int sel_release_policy(struct inode *inode, struct file *filp)
433 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
434 struct policy_load_memory *plm = filp->private_data;
438 fsi->policy_opened = 0;
446 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
447 size_t count, loff_t *ppos)
449 struct policy_load_memory *plm = filp->private_data;
452 ret = avc_has_perm(&selinux_state,
453 current_sid(), SECINITSID_SECURITY,
454 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
458 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
461 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
463 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
464 unsigned long offset;
467 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
468 return VM_FAULT_SIGBUS;
470 offset = vmf->pgoff << PAGE_SHIFT;
471 if (offset >= roundup(plm->len, PAGE_SIZE))
472 return VM_FAULT_SIGBUS;
474 page = vmalloc_to_page(plm->data + offset);
482 static const struct vm_operations_struct sel_mmap_policy_ops = {
483 .fault = sel_mmap_policy_fault,
484 .page_mkwrite = sel_mmap_policy_fault,
487 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
489 if (vma->vm_flags & VM_SHARED) {
490 /* do not allow mprotect to make mapping writable */
491 vma->vm_flags &= ~VM_MAYWRITE;
493 if (vma->vm_flags & VM_WRITE)
497 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
498 vma->vm_ops = &sel_mmap_policy_ops;
503 static const struct file_operations sel_policy_ops = {
504 .open = sel_open_policy,
505 .read = sel_read_policy,
506 .mmap = sel_mmap_policy,
507 .release = sel_release_policy,
508 .llseek = generic_file_llseek,
511 static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
515 ret = sel_make_bools(fsi);
517 pr_err("SELinux: failed to load policy booleans\n");
521 ret = sel_make_classes(fsi);
523 pr_err("SELinux: failed to load policy classes\n");
527 ret = sel_make_policycap(fsi);
529 pr_err("SELinux: failed to load policy capabilities\n");
536 static ssize_t sel_write_load(struct file *file, const char __user *buf,
537 size_t count, loff_t *ppos)
540 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
544 mutex_lock(&fsi->mutex);
546 length = avc_has_perm(&selinux_state,
547 current_sid(), SECINITSID_SECURITY,
548 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
552 /* No partial writes. */
558 data = vmalloc(count);
563 if (copy_from_user(data, buf, count) != 0)
566 length = security_load_policy(fsi->state, data, count);
568 pr_warn_ratelimited("SELinux: failed to load policy\n");
572 length = sel_make_policy_nodes(fsi);
579 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
580 "auid=%u ses=%u lsm=selinux res=1",
581 from_kuid(&init_user_ns, audit_get_loginuid(current)),
582 audit_get_sessionid(current));
584 mutex_unlock(&fsi->mutex);
589 static const struct file_operations sel_load_ops = {
590 .write = sel_write_load,
591 .llseek = generic_file_llseek,
594 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
596 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
597 struct selinux_state *state = fsi->state;
602 length = avc_has_perm(&selinux_state,
603 current_sid(), SECINITSID_SECURITY,
604 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
608 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
612 length = security_sid_to_context(state, sid, &canon, &len);
617 if (len > SIMPLE_TRANSACTION_LIMIT) {
618 pr_err("SELinux: %s: context size (%u) exceeds "
619 "payload max\n", __func__, len);
623 memcpy(buf, canon, len);
630 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
631 size_t count, loff_t *ppos)
633 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
634 char tmpbuf[TMPBUFLEN];
637 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
638 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
641 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
642 size_t count, loff_t *ppos)
644 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
647 unsigned int new_value;
649 length = avc_has_perm(&selinux_state,
650 current_sid(), SECINITSID_SECURITY,
651 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
656 if (count >= PAGE_SIZE)
659 /* No partial writes. */
663 page = memdup_user_nul(buf, count);
665 return PTR_ERR(page);
668 if (sscanf(page, "%u", &new_value) != 1)
671 fsi->state->checkreqprot = new_value ? 1 : 0;
677 static const struct file_operations sel_checkreqprot_ops = {
678 .read = sel_read_checkreqprot,
679 .write = sel_write_checkreqprot,
680 .llseek = generic_file_llseek,
683 static ssize_t sel_write_validatetrans(struct file *file,
684 const char __user *buf,
685 size_t count, loff_t *ppos)
687 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
688 struct selinux_state *state = fsi->state;
689 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
691 u32 osid, nsid, tsid;
695 rc = avc_has_perm(&selinux_state,
696 current_sid(), SECINITSID_SECURITY,
697 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
702 if (count >= PAGE_SIZE)
705 /* No partial writes. */
710 req = memdup_user_nul(buf, count);
718 oldcon = kzalloc(count + 1, GFP_KERNEL);
722 newcon = kzalloc(count + 1, GFP_KERNEL);
726 taskcon = kzalloc(count + 1, GFP_KERNEL);
731 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
734 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
738 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
742 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
746 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
757 static const struct file_operations sel_transition_ops = {
758 .write = sel_write_validatetrans,
759 .llseek = generic_file_llseek,
763 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
766 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
767 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
768 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
769 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
771 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
772 [SEL_ACCESS] = sel_write_access,
773 [SEL_CREATE] = sel_write_create,
774 [SEL_RELABEL] = sel_write_relabel,
775 [SEL_USER] = sel_write_user,
776 [SEL_MEMBER] = sel_write_member,
777 [SEL_CONTEXT] = sel_write_context,
780 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
782 ino_t ino = file_inode(file)->i_ino;
786 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
789 data = simple_transaction_get(file, buf, size);
791 return PTR_ERR(data);
793 rv = write_op[ino](file, data, size);
795 simple_transaction_set(file, rv);
801 static const struct file_operations transaction_ops = {
802 .write = selinux_transaction_write,
803 .read = simple_transaction_read,
804 .release = simple_transaction_release,
805 .llseek = generic_file_llseek,
809 * payload - write methods
810 * If the method has a response, the response should be put in buf,
811 * and the length returned. Otherwise return 0 or and -error.
814 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
816 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
817 struct selinux_state *state = fsi->state;
818 char *scon = NULL, *tcon = NULL;
821 struct av_decision avd;
824 length = avc_has_perm(&selinux_state,
825 current_sid(), SECINITSID_SECURITY,
826 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
831 scon = kzalloc(size + 1, GFP_KERNEL);
836 tcon = kzalloc(size + 1, GFP_KERNEL);
841 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
844 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
848 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
852 security_compute_av_user(state, ssid, tsid, tclass, &avd);
854 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
856 avd.allowed, 0xffffffff,
857 avd.auditallow, avd.auditdeny,
858 avd.seqno, avd.flags);
865 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
867 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
868 struct selinux_state *state = fsi->state;
869 char *scon = NULL, *tcon = NULL;
870 char *namebuf = NULL, *objname = NULL;
871 u32 ssid, tsid, newsid;
878 length = avc_has_perm(&selinux_state,
879 current_sid(), SECINITSID_SECURITY,
880 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
886 scon = kzalloc(size + 1, GFP_KERNEL);
891 tcon = kzalloc(size + 1, GFP_KERNEL);
896 namebuf = kzalloc(size + 1, GFP_KERNEL);
901 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
902 if (nargs < 3 || nargs > 4)
906 * If and when the name of new object to be queried contains
907 * either whitespace or multibyte characters, they shall be
908 * encoded based on the percentage-encoding rule.
909 * If not encoded, the sscanf logic picks up only left-half
910 * of the supplied name; splitted by a whitespace unexpectedly.
920 else if (c1 == '%') {
921 c1 = hex_to_bin(*r++);
924 c2 = hex_to_bin(*r++);
930 } while (c1 != '\0');
935 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
939 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
943 length = security_transition_sid_user(state, ssid, tsid, tclass,
948 length = security_sid_to_context(state, newsid, &newcon, &len);
953 if (len > SIMPLE_TRANSACTION_LIMIT) {
954 pr_err("SELinux: %s: context size (%u) exceeds "
955 "payload max\n", __func__, len);
959 memcpy(buf, newcon, len);
969 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
971 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
972 struct selinux_state *state = fsi->state;
973 char *scon = NULL, *tcon = NULL;
974 u32 ssid, tsid, newsid;
980 length = avc_has_perm(&selinux_state,
981 current_sid(), SECINITSID_SECURITY,
982 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
988 scon = kzalloc(size + 1, GFP_KERNEL);
993 tcon = kzalloc(size + 1, GFP_KERNEL);
998 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1001 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1005 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1009 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1013 length = security_sid_to_context(state, newsid, &newcon, &len);
1018 if (len > SIMPLE_TRANSACTION_LIMIT)
1021 memcpy(buf, newcon, len);
1030 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1032 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1033 struct selinux_state *state = fsi->state;
1034 char *con = NULL, *user = NULL, *ptr;
1035 u32 sid, *sids = NULL;
1041 length = avc_has_perm(&selinux_state,
1042 current_sid(), SECINITSID_SECURITY,
1043 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1049 con = kzalloc(size + 1, GFP_KERNEL);
1054 user = kzalloc(size + 1, GFP_KERNEL);
1059 if (sscanf(buf, "%s %s", con, user) != 2)
1062 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1066 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1070 length = sprintf(buf, "%u", nsids) + 1;
1072 for (i = 0; i < nsids; i++) {
1073 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1078 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1083 memcpy(ptr, newcon, len);
1095 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1097 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1098 struct selinux_state *state = fsi->state;
1099 char *scon = NULL, *tcon = NULL;
1100 u32 ssid, tsid, newsid;
1103 char *newcon = NULL;
1106 length = avc_has_perm(&selinux_state,
1107 current_sid(), SECINITSID_SECURITY,
1108 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1114 scon = kzalloc(size + 1, GFP_KERNEL);
1119 tcon = kzalloc(size + 1, GFP_KERNEL);
1124 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1127 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1131 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1135 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1139 length = security_sid_to_context(state, newsid, &newcon, &len);
1144 if (len > SIMPLE_TRANSACTION_LIMIT) {
1145 pr_err("SELinux: %s: context size (%u) exceeds "
1146 "payload max\n", __func__, len);
1150 memcpy(buf, newcon, len);
1159 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1161 struct inode *ret = new_inode(sb);
1165 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1170 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1171 size_t count, loff_t *ppos)
1173 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1178 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1179 const char *name = filep->f_path.dentry->d_name.name;
1181 mutex_lock(&fsi->mutex);
1184 if (index >= fsi->bool_num || strcmp(name,
1185 fsi->bool_pending_names[index]))
1189 page = (char *)get_zeroed_page(GFP_KERNEL);
1193 cur_enforcing = security_get_bool_value(fsi->state, index);
1194 if (cur_enforcing < 0) {
1195 ret = cur_enforcing;
1198 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1199 fsi->bool_pending_values[index]);
1200 mutex_unlock(&fsi->mutex);
1201 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1203 free_page((unsigned long)page);
1207 mutex_unlock(&fsi->mutex);
1211 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1212 size_t count, loff_t *ppos)
1214 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1218 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1219 const char *name = filep->f_path.dentry->d_name.name;
1221 if (count >= PAGE_SIZE)
1224 /* No partial writes. */
1228 page = memdup_user_nul(buf, count);
1230 return PTR_ERR(page);
1232 mutex_lock(&fsi->mutex);
1234 length = avc_has_perm(&selinux_state,
1235 current_sid(), SECINITSID_SECURITY,
1236 SECCLASS_SECURITY, SECURITY__SETBOOL,
1242 if (index >= fsi->bool_num || strcmp(name,
1243 fsi->bool_pending_names[index]))
1247 if (sscanf(page, "%d", &new_value) != 1)
1253 fsi->bool_pending_values[index] = new_value;
1257 mutex_unlock(&fsi->mutex);
1262 static const struct file_operations sel_bool_ops = {
1263 .read = sel_read_bool,
1264 .write = sel_write_bool,
1265 .llseek = generic_file_llseek,
1268 static ssize_t sel_commit_bools_write(struct file *filep,
1269 const char __user *buf,
1270 size_t count, loff_t *ppos)
1272 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1277 if (count >= PAGE_SIZE)
1280 /* No partial writes. */
1284 page = memdup_user_nul(buf, count);
1286 return PTR_ERR(page);
1288 mutex_lock(&fsi->mutex);
1290 length = avc_has_perm(&selinux_state,
1291 current_sid(), SECINITSID_SECURITY,
1292 SECCLASS_SECURITY, SECURITY__SETBOOL,
1298 if (sscanf(page, "%d", &new_value) != 1)
1302 if (new_value && fsi->bool_pending_values)
1303 length = security_set_bools(fsi->state, fsi->bool_num,
1304 fsi->bool_pending_values);
1310 mutex_unlock(&fsi->mutex);
1315 static const struct file_operations sel_commit_bools_ops = {
1316 .write = sel_commit_bools_write,
1317 .llseek = generic_file_llseek,
1320 static void sel_remove_entries(struct dentry *de)
1323 shrink_dcache_parent(de);
1326 #define BOOL_DIR_NAME "booleans"
1328 static int sel_make_bools(struct selinux_fs_info *fsi)
1332 struct dentry *dentry = NULL;
1333 struct dentry *dir = fsi->bool_dir;
1334 struct inode *inode = NULL;
1335 struct inode_security_struct *isec;
1336 char **names = NULL, *page;
1341 /* remove any existing files */
1342 for (i = 0; i < fsi->bool_num; i++)
1343 kfree(fsi->bool_pending_names[i]);
1344 kfree(fsi->bool_pending_names);
1345 kfree(fsi->bool_pending_values);
1347 fsi->bool_pending_names = NULL;
1348 fsi->bool_pending_values = NULL;
1350 sel_remove_entries(dir);
1353 page = (char *)get_zeroed_page(GFP_KERNEL);
1357 ret = security_get_bools(fsi->state, &num, &names, &values);
1361 for (i = 0; i < num; i++) {
1363 dentry = d_alloc_name(dir, names[i]);
1368 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1374 ret = -ENAMETOOLONG;
1375 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1376 if (len >= PAGE_SIZE) {
1382 isec = selinux_inode(inode);
1383 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1384 SECCLASS_FILE, &sid);
1386 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1388 sid = SECINITSID_SECURITY;
1392 isec->initialized = LABEL_INITIALIZED;
1393 inode->i_fop = &sel_bool_ops;
1394 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1395 d_add(dentry, inode);
1397 fsi->bool_num = num;
1398 fsi->bool_pending_names = names;
1399 fsi->bool_pending_values = values;
1401 free_page((unsigned long)page);
1404 free_page((unsigned long)page);
1407 for (i = 0; i < num; i++)
1412 sel_remove_entries(dir);
1417 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1418 size_t count, loff_t *ppos)
1420 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1421 struct selinux_state *state = fsi->state;
1422 char tmpbuf[TMPBUFLEN];
1425 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1426 avc_get_cache_threshold(state->avc));
1427 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1430 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1431 const char __user *buf,
1432 size_t count, loff_t *ppos)
1435 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1436 struct selinux_state *state = fsi->state;
1439 unsigned int new_value;
1441 ret = avc_has_perm(&selinux_state,
1442 current_sid(), SECINITSID_SECURITY,
1443 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1448 if (count >= PAGE_SIZE)
1451 /* No partial writes. */
1455 page = memdup_user_nul(buf, count);
1457 return PTR_ERR(page);
1460 if (sscanf(page, "%u", &new_value) != 1)
1463 avc_set_cache_threshold(state->avc, new_value);
1471 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1472 size_t count, loff_t *ppos)
1474 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1475 struct selinux_state *state = fsi->state;
1479 page = (char *)__get_free_page(GFP_KERNEL);
1483 length = avc_get_hash_stats(state->avc, page);
1485 length = simple_read_from_buffer(buf, count, ppos, page, length);
1486 free_page((unsigned long)page);
1491 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1492 size_t count, loff_t *ppos)
1494 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1495 struct selinux_state *state = fsi->state;
1499 page = (char *)__get_free_page(GFP_KERNEL);
1503 length = security_sidtab_hash_stats(state, page);
1505 length = simple_read_from_buffer(buf, count, ppos, page,
1507 free_page((unsigned long)page);
1512 static const struct file_operations sel_sidtab_hash_stats_ops = {
1513 .read = sel_read_sidtab_hash_stats,
1514 .llseek = generic_file_llseek,
1517 static const struct file_operations sel_avc_cache_threshold_ops = {
1518 .read = sel_read_avc_cache_threshold,
1519 .write = sel_write_avc_cache_threshold,
1520 .llseek = generic_file_llseek,
1523 static const struct file_operations sel_avc_hash_stats_ops = {
1524 .read = sel_read_avc_hash_stats,
1525 .llseek = generic_file_llseek,
1528 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1529 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1533 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1534 if (!cpu_possible(cpu))
1537 return &per_cpu(avc_cache_stats, cpu);
1542 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1544 loff_t n = *pos - 1;
1547 return SEQ_START_TOKEN;
1549 return sel_avc_get_stat_idx(&n);
1552 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1554 return sel_avc_get_stat_idx(pos);
1557 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1559 struct avc_cache_stats *st = v;
1561 if (v == SEQ_START_TOKEN) {
1563 "lookups hits misses allocations reclaims frees\n");
1565 unsigned int lookups = st->lookups;
1566 unsigned int misses = st->misses;
1567 unsigned int hits = lookups - misses;
1568 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1569 hits, misses, st->allocations,
1570 st->reclaims, st->frees);
1575 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1578 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1579 .start = sel_avc_stats_seq_start,
1580 .next = sel_avc_stats_seq_next,
1581 .show = sel_avc_stats_seq_show,
1582 .stop = sel_avc_stats_seq_stop,
1585 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1587 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1590 static const struct file_operations sel_avc_cache_stats_ops = {
1591 .open = sel_open_avc_cache_stats,
1593 .llseek = seq_lseek,
1594 .release = seq_release,
1598 static int sel_make_avc_files(struct dentry *dir)
1600 struct super_block *sb = dir->d_sb;
1601 struct selinux_fs_info *fsi = sb->s_fs_info;
1603 static const struct tree_descr files[] = {
1604 { "cache_threshold",
1605 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1606 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1607 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1608 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1612 for (i = 0; i < ARRAY_SIZE(files); i++) {
1613 struct inode *inode;
1614 struct dentry *dentry;
1616 dentry = d_alloc_name(dir, files[i].name);
1620 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1626 inode->i_fop = files[i].ops;
1627 inode->i_ino = ++fsi->last_ino;
1628 d_add(dentry, inode);
1634 static int sel_make_ss_files(struct dentry *dir)
1636 struct super_block *sb = dir->d_sb;
1637 struct selinux_fs_info *fsi = sb->s_fs_info;
1639 static struct tree_descr files[] = {
1640 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1643 for (i = 0; i < ARRAY_SIZE(files); i++) {
1644 struct inode *inode;
1645 struct dentry *dentry;
1647 dentry = d_alloc_name(dir, files[i].name);
1651 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1657 inode->i_fop = files[i].ops;
1658 inode->i_ino = ++fsi->last_ino;
1659 d_add(dentry, inode);
1665 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1666 size_t count, loff_t *ppos)
1668 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1673 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1674 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1678 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1683 static const struct file_operations sel_initcon_ops = {
1684 .read = sel_read_initcon,
1685 .llseek = generic_file_llseek,
1688 static int sel_make_initcon_files(struct dentry *dir)
1692 for (i = 1; i <= SECINITSID_NUM; i++) {
1693 struct inode *inode;
1694 struct dentry *dentry;
1695 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1699 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1705 inode->i_fop = &sel_initcon_ops;
1706 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1707 d_add(dentry, inode);
1713 static inline unsigned long sel_class_to_ino(u16 class)
1715 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1718 static inline u16 sel_ino_to_class(unsigned long ino)
1720 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1723 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1725 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1728 static inline u32 sel_ino_to_perm(unsigned long ino)
1730 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1733 static ssize_t sel_read_class(struct file *file, char __user *buf,
1734 size_t count, loff_t *ppos)
1736 unsigned long ino = file_inode(file)->i_ino;
1737 char res[TMPBUFLEN];
1738 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1739 return simple_read_from_buffer(buf, count, ppos, res, len);
1742 static const struct file_operations sel_class_ops = {
1743 .read = sel_read_class,
1744 .llseek = generic_file_llseek,
1747 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1748 size_t count, loff_t *ppos)
1750 unsigned long ino = file_inode(file)->i_ino;
1751 char res[TMPBUFLEN];
1752 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1753 return simple_read_from_buffer(buf, count, ppos, res, len);
1756 static const struct file_operations sel_perm_ops = {
1757 .read = sel_read_perm,
1758 .llseek = generic_file_llseek,
1761 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1762 size_t count, loff_t *ppos)
1764 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1766 char tmpbuf[TMPBUFLEN];
1768 unsigned long i_ino = file_inode(file)->i_ino;
1770 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1771 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1773 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1776 static const struct file_operations sel_policycap_ops = {
1777 .read = sel_read_policycap,
1778 .llseek = generic_file_llseek,
1781 static int sel_make_perm_files(char *objclass, int classvalue,
1784 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1788 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1792 for (i = 0; i < nperms; i++) {
1793 struct inode *inode;
1794 struct dentry *dentry;
1797 dentry = d_alloc_name(dir, perms[i]);
1802 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1808 inode->i_fop = &sel_perm_ops;
1809 /* i+1 since perm values are 1-indexed */
1810 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1811 d_add(dentry, inode);
1815 for (i = 0; i < nperms; i++)
1821 static int sel_make_class_dir_entries(char *classname, int index,
1824 struct super_block *sb = dir->d_sb;
1825 struct selinux_fs_info *fsi = sb->s_fs_info;
1826 struct dentry *dentry = NULL;
1827 struct inode *inode = NULL;
1830 dentry = d_alloc_name(dir, "index");
1834 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1840 inode->i_fop = &sel_class_ops;
1841 inode->i_ino = sel_class_to_ino(index);
1842 d_add(dentry, inode);
1844 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1846 return PTR_ERR(dentry);
1848 rc = sel_make_perm_files(classname, index, dentry);
1853 static int sel_make_classes(struct selinux_fs_info *fsi)
1856 int rc, nclasses, i;
1859 /* delete any existing entries */
1860 sel_remove_entries(fsi->class_dir);
1862 rc = security_get_classes(fsi->state, &classes, &nclasses);
1866 /* +2 since classes are 1-indexed */
1867 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1869 for (i = 0; i < nclasses; i++) {
1870 struct dentry *class_name_dir;
1872 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1873 &fsi->last_class_ino);
1874 if (IS_ERR(class_name_dir)) {
1875 rc = PTR_ERR(class_name_dir);
1879 /* i+1 since class values are 1-indexed */
1880 rc = sel_make_class_dir_entries(classes[i], i + 1,
1887 for (i = 0; i < nclasses; i++)
1893 static int sel_make_policycap(struct selinux_fs_info *fsi)
1896 struct dentry *dentry = NULL;
1897 struct inode *inode = NULL;
1899 sel_remove_entries(fsi->policycap_dir);
1901 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1902 if (iter < ARRAY_SIZE(selinux_policycap_names))
1903 dentry = d_alloc_name(fsi->policycap_dir,
1904 selinux_policycap_names[iter]);
1906 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1911 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1912 if (inode == NULL) {
1917 inode->i_fop = &sel_policycap_ops;
1918 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1919 d_add(dentry, inode);
1925 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1928 struct dentry *dentry = d_alloc_name(dir, name);
1929 struct inode *inode;
1932 return ERR_PTR(-ENOMEM);
1934 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1937 return ERR_PTR(-ENOMEM);
1940 inode->i_op = &simple_dir_inode_operations;
1941 inode->i_fop = &simple_dir_operations;
1942 inode->i_ino = ++(*ino);
1943 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1945 d_add(dentry, inode);
1946 /* bump link count on parent directory, too */
1947 inc_nlink(d_inode(dir));
1952 #define NULL_FILE_NAME "null"
1954 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1956 struct selinux_fs_info *fsi;
1958 struct dentry *dentry;
1959 struct inode *inode;
1960 struct inode_security_struct *isec;
1962 static const struct tree_descr selinux_files[] = {
1963 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1964 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1965 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1966 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1967 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1968 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1969 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1970 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1971 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1972 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1973 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1974 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1975 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1976 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1977 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1978 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1979 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1980 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1985 ret = selinux_fs_info_create(sb);
1989 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1993 fsi = sb->s_fs_info;
1994 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1995 if (IS_ERR(fsi->bool_dir)) {
1996 ret = PTR_ERR(fsi->bool_dir);
1997 fsi->bool_dir = NULL;
2002 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2007 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2013 inode->i_ino = ++fsi->last_ino;
2014 isec = selinux_inode(inode);
2015 isec->sid = SECINITSID_DEVNULL;
2016 isec->sclass = SECCLASS_CHR_FILE;
2017 isec->initialized = LABEL_INITIALIZED;
2019 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2020 d_add(dentry, inode);
2022 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2023 if (IS_ERR(dentry)) {
2024 ret = PTR_ERR(dentry);
2028 ret = sel_make_avc_files(dentry);
2030 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2031 if (IS_ERR(dentry)) {
2032 ret = PTR_ERR(dentry);
2036 ret = sel_make_ss_files(dentry);
2040 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2041 if (IS_ERR(dentry)) {
2042 ret = PTR_ERR(dentry);
2046 ret = sel_make_initcon_files(dentry);
2050 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2051 if (IS_ERR(fsi->class_dir)) {
2052 ret = PTR_ERR(fsi->class_dir);
2053 fsi->class_dir = NULL;
2057 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2059 if (IS_ERR(fsi->policycap_dir)) {
2060 ret = PTR_ERR(fsi->policycap_dir);
2061 fsi->policycap_dir = NULL;
2065 ret = sel_make_policy_nodes(fsi);
2070 pr_err("SELinux: %s: failed while creating inodes\n",
2073 selinux_fs_info_free(sb);
2078 static int sel_get_tree(struct fs_context *fc)
2080 return get_tree_single(fc, sel_fill_super);
2083 static const struct fs_context_operations sel_context_ops = {
2084 .get_tree = sel_get_tree,
2087 static int sel_init_fs_context(struct fs_context *fc)
2089 fc->ops = &sel_context_ops;
2093 static void sel_kill_sb(struct super_block *sb)
2095 selinux_fs_info_free(sb);
2096 kill_litter_super(sb);
2099 static struct file_system_type sel_fs_type = {
2100 .name = "selinuxfs",
2101 .init_fs_context = sel_init_fs_context,
2102 .kill_sb = sel_kill_sb,
2105 struct vfsmount *selinuxfs_mount;
2106 struct path selinux_null;
2108 static int __init init_sel_fs(void)
2110 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2111 sizeof(NULL_FILE_NAME)-1);
2114 if (!selinux_enabled_boot)
2117 err = sysfs_create_mount_point(fs_kobj, "selinux");
2121 err = register_filesystem(&sel_fs_type);
2123 sysfs_remove_mount_point(fs_kobj, "selinux");
2127 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2128 if (IS_ERR(selinuxfs_mount)) {
2129 pr_err("selinuxfs: could not mount!\n");
2130 err = PTR_ERR(selinuxfs_mount);
2131 selinuxfs_mount = NULL;
2133 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2135 if (IS_ERR(selinux_null.dentry)) {
2136 pr_err("selinuxfs: could not lookup null!\n");
2137 err = PTR_ERR(selinux_null.dentry);
2138 selinux_null.dentry = NULL;
2144 __initcall(init_sel_fs);
2146 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2147 void exit_sel_fs(void)
2149 sysfs_remove_mount_point(fs_kobj, "selinux");
2150 dput(selinux_null.dentry);
2151 kern_unmount(selinuxfs_mount);
2152 unregister_filesystem(&sel_fs_type);