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TOMOYO Linux Cross Reference
Linux/security/selinux/selinuxfs.c

Version: ~ [ linux-5.6.3 ] ~ [ linux-5.5.16 ] ~ [ linux-5.4.31 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.114 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.175 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.218 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.218 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
  2  *
  3  *      Added conditional policy language extensions
  4  *
  5  *  Updated: Hewlett-Packard <paul@paul-moore.com>
  6  *
  7  *      Added support for the policy capability bitmap
  8  *
  9  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
 10  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
 11  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
 12  *      This program is free software; you can redistribute it and/or modify
 13  *      it under the terms of the GNU General Public License as published by
 14  *      the Free Software Foundation, version 2.
 15  */
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/pagemap.h>
 19 #include <linux/slab.h>
 20 #include <linux/vmalloc.h>
 21 #include <linux/fs.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>
 33 
 34 /* selinuxfs pseudo filesystem for exporting the security policy API.
 35    Based on the proc code and the fs/nfsd/nfsctl.c code. */
 36 
 37 #include "flask.h"
 38 #include "avc.h"
 39 #include "avc_ss.h"
 40 #include "security.h"
 41 #include "objsec.h"
 42 #include "conditional.h"
 43 
 44 /* Policy capability filenames */
 45 static char *policycap_names[] = {
 46         "network_peer_controls",
 47         "open_perms"
 48 };
 49 
 50 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
 51 
 52 static int __init checkreqprot_setup(char *str)
 53 {
 54         unsigned long checkreqprot;
 55         if (!strict_strtoul(str, 0, &checkreqprot))
 56                 selinux_checkreqprot = checkreqprot ? 1 : 0;
 57         return 1;
 58 }
 59 __setup("checkreqprot=", checkreqprot_setup);
 60 
 61 static DEFINE_MUTEX(sel_mutex);
 62 
 63 /* global data for booleans */
 64 static struct dentry *bool_dir;
 65 static int bool_num;
 66 static char **bool_pending_names;
 67 static int *bool_pending_values;
 68 
 69 /* global data for classes */
 70 static struct dentry *class_dir;
 71 static unsigned long last_class_ino;
 72 
 73 static char policy_opened;
 74 
 75 /* global data for policy capabilities */
 76 static struct dentry *policycap_dir;
 77 
 78 /* Check whether a task is allowed to use a security operation. */
 79 static int task_has_security(struct task_struct *tsk,
 80                              u32 perms)
 81 {
 82         const struct task_security_struct *tsec;
 83         u32 sid = 0;
 84 
 85         rcu_read_lock();
 86         tsec = __task_cred(tsk)->security;
 87         if (tsec)
 88                 sid = tsec->sid;
 89         rcu_read_unlock();
 90         if (!tsec)
 91                 return -EACCES;
 92 
 93         return avc_has_perm(sid, SECINITSID_SECURITY,
 94                             SECCLASS_SECURITY, perms, NULL);
 95 }
 96 
 97 enum sel_inos {
 98         SEL_ROOT_INO = 2,
 99         SEL_LOAD,       /* load policy */
100         SEL_ENFORCE,    /* get or set enforcing status */
101         SEL_CONTEXT,    /* validate context */
102         SEL_ACCESS,     /* compute access decision */
103         SEL_CREATE,     /* compute create labeling decision */
104         SEL_RELABEL,    /* compute relabeling decision */
105         SEL_USER,       /* compute reachable user contexts */
106         SEL_POLICYVERS, /* return policy version for this kernel */
107         SEL_COMMIT_BOOLS, /* commit new boolean values */
108         SEL_MLS,        /* return if MLS policy is enabled */
109         SEL_DISABLE,    /* disable SELinux until next reboot */
110         SEL_MEMBER,     /* compute polyinstantiation membership decision */
111         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
113         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
115         SEL_STATUS,     /* export current status using mmap() */
116         SEL_POLICY,     /* allow userspace to read the in kernel policy */
117         SEL_INO_NEXT,   /* The next inode number to use */
118 };
119 
120 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
121 
122 #define SEL_INITCON_INO_OFFSET          0x01000000
123 #define SEL_BOOL_INO_OFFSET             0x02000000
124 #define SEL_CLASS_INO_OFFSET            0x04000000
125 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
126 #define SEL_INO_MASK                    0x00ffffff
127 
128 #define TMPBUFLEN       12
129 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130                                 size_t count, loff_t *ppos)
131 {
132         char tmpbuf[TMPBUFLEN];
133         ssize_t length;
134 
135         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
137 }
138 
139 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
141                                  size_t count, loff_t *ppos)
142 
143 {
144         char *page = NULL;
145         ssize_t length;
146         int new_value;
147 
148         length = -ENOMEM;
149         if (count >= PAGE_SIZE)
150                 goto out;
151 
152         /* No partial writes. */
153         length = EINVAL;
154         if (*ppos != 0)
155                 goto out;
156 
157         length = -ENOMEM;
158         page = (char *)get_zeroed_page(GFP_KERNEL);
159         if (!page)
160                 goto out;
161 
162         length = -EFAULT;
163         if (copy_from_user(page, buf, count))
164                 goto out;
165 
166         length = -EINVAL;
167         if (sscanf(page, "%d", &new_value) != 1)
168                 goto out;
169 
170         if (new_value != selinux_enforcing) {
171                 length = task_has_security(current, SECURITY__SETENFORCE);
172                 if (length)
173                         goto out;
174                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176                         new_value, selinux_enforcing,
177                         audit_get_loginuid(current),
178                         audit_get_sessionid(current));
179                 selinux_enforcing = new_value;
180                 if (selinux_enforcing)
181                         avc_ss_reset(0);
182                 selnl_notify_setenforce(selinux_enforcing);
183                 selinux_status_update_setenforce(selinux_enforcing);
184         }
185         length = count;
186 out:
187         free_page((unsigned long) page);
188         return length;
189 }
190 #else
191 #define sel_write_enforce NULL
192 #endif
193 
194 static const struct file_operations sel_enforce_ops = {
195         .read           = sel_read_enforce,
196         .write          = sel_write_enforce,
197         .llseek         = generic_file_llseek,
198 };
199 
200 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201                                         size_t count, loff_t *ppos)
202 {
203         char tmpbuf[TMPBUFLEN];
204         ssize_t length;
205         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
206         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207                 security_get_reject_unknown() : !security_get_allow_unknown();
208 
209         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211 }
212 
213 static const struct file_operations sel_handle_unknown_ops = {
214         .read           = sel_read_handle_unknown,
215         .llseek         = generic_file_llseek,
216 };
217 
218 static int sel_open_handle_status(struct inode *inode, struct file *filp)
219 {
220         struct page    *status = selinux_kernel_status_page();
221 
222         if (!status)
223                 return -ENOMEM;
224 
225         filp->private_data = status;
226 
227         return 0;
228 }
229 
230 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231                                       size_t count, loff_t *ppos)
232 {
233         struct page    *status = filp->private_data;
234 
235         BUG_ON(!status);
236 
237         return simple_read_from_buffer(buf, count, ppos,
238                                        page_address(status),
239                                        sizeof(struct selinux_kernel_status));
240 }
241 
242 static int sel_mmap_handle_status(struct file *filp,
243                                   struct vm_area_struct *vma)
244 {
245         struct page    *status = filp->private_data;
246         unsigned long   size = vma->vm_end - vma->vm_start;
247 
248         BUG_ON(!status);
249 
250         /* only allows one page from the head */
251         if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
252                 return -EIO;
253         /* disallow writable mapping */
254         if (vma->vm_flags & VM_WRITE)
255                 return -EPERM;
256         /* disallow mprotect() turns it into writable */
257         vma->vm_flags &= ~VM_MAYWRITE;
258 
259         return remap_pfn_range(vma, vma->vm_start,
260                                page_to_pfn(status),
261                                size, vma->vm_page_prot);
262 }
263 
264 static const struct file_operations sel_handle_status_ops = {
265         .open           = sel_open_handle_status,
266         .read           = sel_read_handle_status,
267         .mmap           = sel_mmap_handle_status,
268         .llseek         = generic_file_llseek,
269 };
270 
271 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
272 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
273                                  size_t count, loff_t *ppos)
274 
275 {
276         char *page = NULL;
277         ssize_t length;
278         int new_value;
279 
280         length = -ENOMEM;
281         if (count >= PAGE_SIZE)
282                 goto out;
283 
284         /* No partial writes. */
285         length = -EINVAL;
286         if (*ppos != 0)
287                 goto out;
288 
289         length = -ENOMEM;
290         page = (char *)get_zeroed_page(GFP_KERNEL);
291         if (!page)
292                 goto out;
293 
294         length = -EFAULT;
295         if (copy_from_user(page, buf, count))
296                 goto out;
297 
298         length = -EINVAL;
299         if (sscanf(page, "%d", &new_value) != 1)
300                 goto out;
301 
302         if (new_value) {
303                 length = selinux_disable();
304                 if (length)
305                         goto out;
306                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
307                         "selinux=0 auid=%u ses=%u",
308                         audit_get_loginuid(current),
309                         audit_get_sessionid(current));
310         }
311 
312         length = count;
313 out:
314         free_page((unsigned long) page);
315         return length;
316 }
317 #else
318 #define sel_write_disable NULL
319 #endif
320 
321 static const struct file_operations sel_disable_ops = {
322         .write          = sel_write_disable,
323         .llseek         = generic_file_llseek,
324 };
325 
326 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
327                                    size_t count, loff_t *ppos)
328 {
329         char tmpbuf[TMPBUFLEN];
330         ssize_t length;
331 
332         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
333         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
334 }
335 
336 static const struct file_operations sel_policyvers_ops = {
337         .read           = sel_read_policyvers,
338         .llseek         = generic_file_llseek,
339 };
340 
341 /* declaration for sel_write_load */
342 static int sel_make_bools(void);
343 static int sel_make_classes(void);
344 static int sel_make_policycap(void);
345 
346 /* declaration for sel_make_class_dirs */
347 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
348                         unsigned long *ino);
349 
350 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
351                                 size_t count, loff_t *ppos)
352 {
353         char tmpbuf[TMPBUFLEN];
354         ssize_t length;
355 
356         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
357                            security_mls_enabled());
358         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
359 }
360 
361 static const struct file_operations sel_mls_ops = {
362         .read           = sel_read_mls,
363         .llseek         = generic_file_llseek,
364 };
365 
366 struct policy_load_memory {
367         size_t len;
368         void *data;
369 };
370 
371 static int sel_open_policy(struct inode *inode, struct file *filp)
372 {
373         struct policy_load_memory *plm = NULL;
374         int rc;
375 
376         BUG_ON(filp->private_data);
377 
378         mutex_lock(&sel_mutex);
379 
380         rc = task_has_security(current, SECURITY__READ_POLICY);
381         if (rc)
382                 goto err;
383 
384         rc = -EBUSY;
385         if (policy_opened)
386                 goto err;
387 
388         rc = -ENOMEM;
389         plm = kzalloc(sizeof(*plm), GFP_KERNEL);
390         if (!plm)
391                 goto err;
392 
393         if (i_size_read(inode) != security_policydb_len()) {
394                 mutex_lock(&inode->i_mutex);
395                 i_size_write(inode, security_policydb_len());
396                 mutex_unlock(&inode->i_mutex);
397         }
398 
399         rc = security_read_policy(&plm->data, &plm->len);
400         if (rc)
401                 goto err;
402 
403         policy_opened = 1;
404 
405         filp->private_data = plm;
406 
407         mutex_unlock(&sel_mutex);
408 
409         return 0;
410 err:
411         mutex_unlock(&sel_mutex);
412 
413         if (plm)
414                 vfree(plm->data);
415         kfree(plm);
416         return rc;
417 }
418 
419 static int sel_release_policy(struct inode *inode, struct file *filp)
420 {
421         struct policy_load_memory *plm = filp->private_data;
422 
423         BUG_ON(!plm);
424 
425         policy_opened = 0;
426 
427         vfree(plm->data);
428         kfree(plm);
429 
430         return 0;
431 }
432 
433 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
434                                size_t count, loff_t *ppos)
435 {
436         struct policy_load_memory *plm = filp->private_data;
437         int ret;
438 
439         mutex_lock(&sel_mutex);
440 
441         ret = task_has_security(current, SECURITY__READ_POLICY);
442         if (ret)
443                 goto out;
444 
445         ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
446 out:
447         mutex_unlock(&sel_mutex);
448         return ret;
449 }
450 
451 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
452                                  struct vm_fault *vmf)
453 {
454         struct policy_load_memory *plm = vma->vm_file->private_data;
455         unsigned long offset;
456         struct page *page;
457 
458         if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
459                 return VM_FAULT_SIGBUS;
460 
461         offset = vmf->pgoff << PAGE_SHIFT;
462         if (offset >= roundup(plm->len, PAGE_SIZE))
463                 return VM_FAULT_SIGBUS;
464 
465         page = vmalloc_to_page(plm->data + offset);
466         get_page(page);
467 
468         vmf->page = page;
469 
470         return 0;
471 }
472 
473 static struct vm_operations_struct sel_mmap_policy_ops = {
474         .fault = sel_mmap_policy_fault,
475         .page_mkwrite = sel_mmap_policy_fault,
476 };
477 
478 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
479 {
480         if (vma->vm_flags & VM_SHARED) {
481                 /* do not allow mprotect to make mapping writable */
482                 vma->vm_flags &= ~VM_MAYWRITE;
483 
484                 if (vma->vm_flags & VM_WRITE)
485                         return -EACCES;
486         }
487 
488         vma->vm_flags |= VM_RESERVED;
489         vma->vm_ops = &sel_mmap_policy_ops;
490 
491         return 0;
492 }
493 
494 static const struct file_operations sel_policy_ops = {
495         .open           = sel_open_policy,
496         .read           = sel_read_policy,
497         .mmap           = sel_mmap_policy,
498         .release        = sel_release_policy,
499 };
500 
501 static ssize_t sel_write_load(struct file *file, const char __user *buf,
502                               size_t count, loff_t *ppos)
503 
504 {
505         ssize_t length;
506         void *data = NULL;
507 
508         mutex_lock(&sel_mutex);
509 
510         length = task_has_security(current, SECURITY__LOAD_POLICY);
511         if (length)
512                 goto out;
513 
514         /* No partial writes. */
515         length = -EINVAL;
516         if (*ppos != 0)
517                 goto out;
518 
519         length = -EFBIG;
520         if (count > 64 * 1024 * 1024)
521                 goto out;
522 
523         length = -ENOMEM;
524         data = vmalloc(count);
525         if (!data)
526                 goto out;
527 
528         length = -EFAULT;
529         if (copy_from_user(data, buf, count) != 0)
530                 goto out;
531 
532         length = security_load_policy(data, count);
533         if (length)
534                 goto out;
535 
536         length = sel_make_bools();
537         if (length)
538                 goto out1;
539 
540         length = sel_make_classes();
541         if (length)
542                 goto out1;
543 
544         length = sel_make_policycap();
545         if (length)
546                 goto out1;
547 
548         length = count;
549 
550 out1:
551         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
552                 "policy loaded auid=%u ses=%u",
553                 audit_get_loginuid(current),
554                 audit_get_sessionid(current));
555 out:
556         mutex_unlock(&sel_mutex);
557         vfree(data);
558         return length;
559 }
560 
561 static const struct file_operations sel_load_ops = {
562         .write          = sel_write_load,
563         .llseek         = generic_file_llseek,
564 };
565 
566 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
567 {
568         char *canon = NULL;
569         u32 sid, len;
570         ssize_t length;
571 
572         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
573         if (length)
574                 goto out;
575 
576         length = security_context_to_sid(buf, size, &sid);
577         if (length)
578                 goto out;
579 
580         length = security_sid_to_context(sid, &canon, &len);
581         if (length)
582                 goto out;
583 
584         length = -ERANGE;
585         if (len > SIMPLE_TRANSACTION_LIMIT) {
586                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
587                         "payload max\n", __func__, len);
588                 goto out;
589         }
590 
591         memcpy(buf, canon, len);
592         length = len;
593 out:
594         kfree(canon);
595         return length;
596 }
597 
598 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
599                                      size_t count, loff_t *ppos)
600 {
601         char tmpbuf[TMPBUFLEN];
602         ssize_t length;
603 
604         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
605         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
606 }
607 
608 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
609                                       size_t count, loff_t *ppos)
610 {
611         char *page = NULL;
612         ssize_t length;
613         unsigned int new_value;
614 
615         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
616         if (length)
617                 goto out;
618 
619         length = -ENOMEM;
620         if (count >= PAGE_SIZE)
621                 goto out;
622 
623         /* No partial writes. */
624         length = -EINVAL;
625         if (*ppos != 0)
626                 goto out;
627 
628         length = -ENOMEM;
629         page = (char *)get_zeroed_page(GFP_KERNEL);
630         if (!page)
631                 goto out;
632 
633         length = -EFAULT;
634         if (copy_from_user(page, buf, count))
635                 goto out;
636 
637         length = -EINVAL;
638         if (sscanf(page, "%u", &new_value) != 1)
639                 goto out;
640 
641         selinux_checkreqprot = new_value ? 1 : 0;
642         length = count;
643 out:
644         free_page((unsigned long) page);
645         return length;
646 }
647 static const struct file_operations sel_checkreqprot_ops = {
648         .read           = sel_read_checkreqprot,
649         .write          = sel_write_checkreqprot,
650         .llseek         = generic_file_llseek,
651 };
652 
653 /*
654  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
655  */
656 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
657 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
658 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
659 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
661 
662 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
663         [SEL_ACCESS] = sel_write_access,
664         [SEL_CREATE] = sel_write_create,
665         [SEL_RELABEL] = sel_write_relabel,
666         [SEL_USER] = sel_write_user,
667         [SEL_MEMBER] = sel_write_member,
668         [SEL_CONTEXT] = sel_write_context,
669 };
670 
671 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
672 {
673         ino_t ino = file->f_path.dentry->d_inode->i_ino;
674         char *data;
675         ssize_t rv;
676 
677         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
678                 return -EINVAL;
679 
680         data = simple_transaction_get(file, buf, size);
681         if (IS_ERR(data))
682                 return PTR_ERR(data);
683 
684         rv = write_op[ino](file, data, size);
685         if (rv > 0) {
686                 simple_transaction_set(file, rv);
687                 rv = size;
688         }
689         return rv;
690 }
691 
692 static const struct file_operations transaction_ops = {
693         .write          = selinux_transaction_write,
694         .read           = simple_transaction_read,
695         .release        = simple_transaction_release,
696         .llseek         = generic_file_llseek,
697 };
698 
699 /*
700  * payload - write methods
701  * If the method has a response, the response should be put in buf,
702  * and the length returned.  Otherwise return 0 or and -error.
703  */
704 
705 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
706 {
707         char *scon = NULL, *tcon = NULL;
708         u32 ssid, tsid;
709         u16 tclass;
710         struct av_decision avd;
711         ssize_t length;
712 
713         length = task_has_security(current, SECURITY__COMPUTE_AV);
714         if (length)
715                 goto out;
716 
717         length = -ENOMEM;
718         scon = kzalloc(size + 1, GFP_KERNEL);
719         if (!scon)
720                 goto out;
721 
722         length = -ENOMEM;
723         tcon = kzalloc(size + 1, GFP_KERNEL);
724         if (!tcon)
725                 goto out;
726 
727         length = -EINVAL;
728         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
729                 goto out;
730 
731         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
732         if (length)
733                 goto out;
734 
735         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
736         if (length)
737                 goto out;
738 
739         security_compute_av_user(ssid, tsid, tclass, &avd);
740 
741         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
742                           "%x %x %x %x %u %x",
743                           avd.allowed, 0xffffffff,
744                           avd.auditallow, avd.auditdeny,
745                           avd.seqno, avd.flags);
746 out:
747         kfree(tcon);
748         kfree(scon);
749         return length;
750 }
751 
752 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
753 {
754         char *scon = NULL, *tcon = NULL;
755         char *namebuf = NULL, *objname = NULL;
756         u32 ssid, tsid, newsid;
757         u16 tclass;
758         ssize_t length;
759         char *newcon = NULL;
760         u32 len;
761         int nargs;
762 
763         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
764         if (length)
765                 goto out;
766 
767         length = -ENOMEM;
768         scon = kzalloc(size + 1, GFP_KERNEL);
769         if (!scon)
770                 goto out;
771 
772         length = -ENOMEM;
773         tcon = kzalloc(size + 1, GFP_KERNEL);
774         if (!tcon)
775                 goto out;
776 
777         length = -ENOMEM;
778         namebuf = kzalloc(size + 1, GFP_KERNEL);
779         if (!namebuf)
780                 goto out;
781 
782         length = -EINVAL;
783         nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
784         if (nargs < 3 || nargs > 4)
785                 goto out;
786         if (nargs == 4) {
787                 /*
788                  * If and when the name of new object to be queried contains
789                  * either whitespace or multibyte characters, they shall be
790                  * encoded based on the percentage-encoding rule.
791                  * If not encoded, the sscanf logic picks up only left-half
792                  * of the supplied name; splitted by a whitespace unexpectedly.
793                  */
794                 char   *r, *w;
795                 int     c1, c2;
796 
797                 r = w = namebuf;
798                 do {
799                         c1 = *r++;
800                         if (c1 == '+')
801                                 c1 = ' ';
802                         else if (c1 == '%') {
803                                 c1 = hex_to_bin(*r++);
804                                 if (c1 < 0)
805                                         goto out;
806                                 c2 = hex_to_bin(*r++);
807                                 if (c2 < 0)
808                                         goto out;
809                                 c1 = (c1 << 4) | c2;
810                         }
811                         *w++ = c1;
812                 } while (c1 != '\0');
813 
814                 objname = namebuf;
815         }
816 
817         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
818         if (length)
819                 goto out;
820 
821         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
822         if (length)
823                 goto out;
824 
825         length = security_transition_sid_user(ssid, tsid, tclass,
826                                               objname, &newsid);
827         if (length)
828                 goto out;
829 
830         length = security_sid_to_context(newsid, &newcon, &len);
831         if (length)
832                 goto out;
833 
834         length = -ERANGE;
835         if (len > SIMPLE_TRANSACTION_LIMIT) {
836                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
837                         "payload max\n", __func__, len);
838                 goto out;
839         }
840 
841         memcpy(buf, newcon, len);
842         length = len;
843 out:
844         kfree(newcon);
845         kfree(namebuf);
846         kfree(tcon);
847         kfree(scon);
848         return length;
849 }
850 
851 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
852 {
853         char *scon = NULL, *tcon = NULL;
854         u32 ssid, tsid, newsid;
855         u16 tclass;
856         ssize_t length;
857         char *newcon = NULL;
858         u32 len;
859 
860         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
861         if (length)
862                 goto out;
863 
864         length = -ENOMEM;
865         scon = kzalloc(size + 1, GFP_KERNEL);
866         if (!scon)
867                 goto out;
868 
869         length = -ENOMEM;
870         tcon = kzalloc(size + 1, GFP_KERNEL);
871         if (!tcon)
872                 goto out;
873 
874         length = -EINVAL;
875         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
876                 goto out;
877 
878         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
879         if (length)
880                 goto out;
881 
882         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
883         if (length)
884                 goto out;
885 
886         length = security_change_sid(ssid, tsid, tclass, &newsid);
887         if (length)
888                 goto out;
889 
890         length = security_sid_to_context(newsid, &newcon, &len);
891         if (length)
892                 goto out;
893 
894         length = -ERANGE;
895         if (len > SIMPLE_TRANSACTION_LIMIT)
896                 goto out;
897 
898         memcpy(buf, newcon, len);
899         length = len;
900 out:
901         kfree(newcon);
902         kfree(tcon);
903         kfree(scon);
904         return length;
905 }
906 
907 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
908 {
909         char *con = NULL, *user = NULL, *ptr;
910         u32 sid, *sids = NULL;
911         ssize_t length;
912         char *newcon;
913         int i, rc;
914         u32 len, nsids;
915 
916         length = task_has_security(current, SECURITY__COMPUTE_USER);
917         if (length)
918                 goto out;
919 
920         length = -ENOMEM;
921         con = kzalloc(size + 1, GFP_KERNEL);
922         if (!con)
923                 goto out;
924 
925         length = -ENOMEM;
926         user = kzalloc(size + 1, GFP_KERNEL);
927         if (!user)
928                 goto out;
929 
930         length = -EINVAL;
931         if (sscanf(buf, "%s %s", con, user) != 2)
932                 goto out;
933 
934         length = security_context_to_sid(con, strlen(con) + 1, &sid);
935         if (length)
936                 goto out;
937 
938         length = security_get_user_sids(sid, user, &sids, &nsids);
939         if (length)
940                 goto out;
941 
942         length = sprintf(buf, "%u", nsids) + 1;
943         ptr = buf + length;
944         for (i = 0; i < nsids; i++) {
945                 rc = security_sid_to_context(sids[i], &newcon, &len);
946                 if (rc) {
947                         length = rc;
948                         goto out;
949                 }
950                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
951                         kfree(newcon);
952                         length = -ERANGE;
953                         goto out;
954                 }
955                 memcpy(ptr, newcon, len);
956                 kfree(newcon);
957                 ptr += len;
958                 length += len;
959         }
960 out:
961         kfree(sids);
962         kfree(user);
963         kfree(con);
964         return length;
965 }
966 
967 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
968 {
969         char *scon = NULL, *tcon = NULL;
970         u32 ssid, tsid, newsid;
971         u16 tclass;
972         ssize_t length;
973         char *newcon = NULL;
974         u32 len;
975 
976         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
977         if (length)
978                 goto out;
979 
980         length = -ENOMEM;
981         scon = kzalloc(size + 1, GFP_KERNEL);
982         if (!scon)
983                 goto out;
984 
985         length = -ENOMEM;
986         tcon = kzalloc(size + 1, GFP_KERNEL);
987         if (!tcon)
988                 goto out;
989 
990         length = -EINVAL;
991         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
992                 goto out;
993 
994         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
995         if (length)
996                 goto out;
997 
998         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
999         if (length)
1000                 goto out;
1001 
1002         length = security_member_sid(ssid, tsid, tclass, &newsid);
1003         if (length)
1004                 goto out;
1005 
1006         length = security_sid_to_context(newsid, &newcon, &len);
1007         if (length)
1008                 goto out;
1009 
1010         length = -ERANGE;
1011         if (len > SIMPLE_TRANSACTION_LIMIT) {
1012                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
1013                         "payload max\n", __func__, len);
1014                 goto out;
1015         }
1016 
1017         memcpy(buf, newcon, len);
1018         length = len;
1019 out:
1020         kfree(newcon);
1021         kfree(tcon);
1022         kfree(scon);
1023         return length;
1024 }
1025 
1026 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1027 {
1028         struct inode *ret = new_inode(sb);
1029 
1030         if (ret) {
1031                 ret->i_mode = mode;
1032                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1033         }
1034         return ret;
1035 }
1036 
1037 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1038                              size_t count, loff_t *ppos)
1039 {
1040         char *page = NULL;
1041         ssize_t length;
1042         ssize_t ret;
1043         int cur_enforcing;
1044         struct inode *inode = filep->f_path.dentry->d_inode;
1045         unsigned index = inode->i_ino & SEL_INO_MASK;
1046         const char *name = filep->f_path.dentry->d_name.name;
1047 
1048         mutex_lock(&sel_mutex);
1049 
1050         ret = -EINVAL;
1051         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1052                 goto out;
1053 
1054         ret = -ENOMEM;
1055         page = (char *)get_zeroed_page(GFP_KERNEL);
1056         if (!page)
1057                 goto out;
1058 
1059         cur_enforcing = security_get_bool_value(index);
1060         if (cur_enforcing < 0) {
1061                 ret = cur_enforcing;
1062                 goto out;
1063         }
1064         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1065                           bool_pending_values[index]);
1066         ret = simple_read_from_buffer(buf, count, ppos, page, length);
1067 out:
1068         mutex_unlock(&sel_mutex);
1069         free_page((unsigned long)page);
1070         return ret;
1071 }
1072 
1073 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1074                               size_t count, loff_t *ppos)
1075 {
1076         char *page = NULL;
1077         ssize_t length;
1078         int new_value;
1079         struct inode *inode = filep->f_path.dentry->d_inode;
1080         unsigned index = inode->i_ino & SEL_INO_MASK;
1081         const char *name = filep->f_path.dentry->d_name.name;
1082 
1083         mutex_lock(&sel_mutex);
1084 
1085         length = task_has_security(current, SECURITY__SETBOOL);
1086         if (length)
1087                 goto out;
1088 
1089         length = -EINVAL;
1090         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1091                 goto out;
1092 
1093         length = -ENOMEM;
1094         if (count >= PAGE_SIZE)
1095                 goto out;
1096 
1097         /* No partial writes. */
1098         length = -EINVAL;
1099         if (*ppos != 0)
1100                 goto out;
1101 
1102         length = -ENOMEM;
1103         page = (char *)get_zeroed_page(GFP_KERNEL);
1104         if (!page)
1105                 goto out;
1106 
1107         length = -EFAULT;
1108         if (copy_from_user(page, buf, count))
1109                 goto out;
1110 
1111         length = -EINVAL;
1112         if (sscanf(page, "%d", &new_value) != 1)
1113                 goto out;
1114 
1115         if (new_value)
1116                 new_value = 1;
1117 
1118         bool_pending_values[index] = new_value;
1119         length = count;
1120 
1121 out:
1122         mutex_unlock(&sel_mutex);
1123         free_page((unsigned long) page);
1124         return length;
1125 }
1126 
1127 static const struct file_operations sel_bool_ops = {
1128         .read           = sel_read_bool,
1129         .write          = sel_write_bool,
1130         .llseek         = generic_file_llseek,
1131 };
1132 
1133 static ssize_t sel_commit_bools_write(struct file *filep,
1134                                       const char __user *buf,
1135                                       size_t count, loff_t *ppos)
1136 {
1137         char *page = NULL;
1138         ssize_t length;
1139         int new_value;
1140 
1141         mutex_lock(&sel_mutex);
1142 
1143         length = task_has_security(current, SECURITY__SETBOOL);
1144         if (length)
1145                 goto out;
1146 
1147         length = -ENOMEM;
1148         if (count >= PAGE_SIZE)
1149                 goto out;
1150 
1151         /* No partial writes. */
1152         length = -EINVAL;
1153         if (*ppos != 0)
1154                 goto out;
1155 
1156         length = -ENOMEM;
1157         page = (char *)get_zeroed_page(GFP_KERNEL);
1158         if (!page)
1159                 goto out;
1160 
1161         length = -EFAULT;
1162         if (copy_from_user(page, buf, count))
1163                 goto out;
1164 
1165         length = -EINVAL;
1166         if (sscanf(page, "%d", &new_value) != 1)
1167                 goto out;
1168 
1169         length = 0;
1170         if (new_value && bool_pending_values)
1171                 length = security_set_bools(bool_num, bool_pending_values);
1172 
1173         if (!length)
1174                 length = count;
1175 
1176 out:
1177         mutex_unlock(&sel_mutex);
1178         free_page((unsigned long) page);
1179         return length;
1180 }
1181 
1182 static const struct file_operations sel_commit_bools_ops = {
1183         .write          = sel_commit_bools_write,
1184         .llseek         = generic_file_llseek,
1185 };
1186 
1187 static void sel_remove_entries(struct dentry *de)
1188 {
1189         struct list_head *node;
1190 
1191         spin_lock(&de->d_lock);
1192         node = de->d_subdirs.next;
1193         while (node != &de->d_subdirs) {
1194                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1195 
1196                 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1197                 list_del_init(node);
1198 
1199                 if (d->d_inode) {
1200                         dget_dlock(d);
1201                         spin_unlock(&de->d_lock);
1202                         spin_unlock(&d->d_lock);
1203                         d_delete(d);
1204                         simple_unlink(de->d_inode, d);
1205                         dput(d);
1206                         spin_lock(&de->d_lock);
1207                 } else
1208                         spin_unlock(&d->d_lock);
1209                 node = de->d_subdirs.next;
1210         }
1211 
1212         spin_unlock(&de->d_lock);
1213 }
1214 
1215 #define BOOL_DIR_NAME "booleans"
1216 
1217 static int sel_make_bools(void)
1218 {
1219         int i, ret;
1220         ssize_t len;
1221         struct dentry *dentry = NULL;
1222         struct dentry *dir = bool_dir;
1223         struct inode *inode = NULL;
1224         struct inode_security_struct *isec;
1225         char **names = NULL, *page;
1226         int num;
1227         int *values = NULL;
1228         u32 sid;
1229 
1230         /* remove any existing files */
1231         for (i = 0; i < bool_num; i++)
1232                 kfree(bool_pending_names[i]);
1233         kfree(bool_pending_names);
1234         kfree(bool_pending_values);
1235         bool_num = 0;
1236         bool_pending_names = NULL;
1237         bool_pending_values = NULL;
1238 
1239         sel_remove_entries(dir);
1240 
1241         ret = -ENOMEM;
1242         page = (char *)get_zeroed_page(GFP_KERNEL);
1243         if (!page)
1244                 goto out;
1245 
1246         ret = security_get_bools(&num, &names, &values);
1247         if (ret)
1248                 goto out;
1249 
1250         for (i = 0; i < num; i++) {
1251                 ret = -ENOMEM;
1252                 dentry = d_alloc_name(dir, names[i]);
1253                 if (!dentry)
1254                         goto out;
1255 
1256                 ret = -ENOMEM;
1257                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1258                 if (!inode)
1259                         goto out;
1260 
1261                 ret = -EINVAL;
1262                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1263                 if (len < 0)
1264                         goto out;
1265 
1266                 ret = -ENAMETOOLONG;
1267                 if (len >= PAGE_SIZE)
1268                         goto out;
1269 
1270                 isec = (struct inode_security_struct *)inode->i_security;
1271                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1272                 if (ret)
1273                         goto out;
1274 
1275                 isec->sid = sid;
1276                 isec->initialized = 1;
1277                 inode->i_fop = &sel_bool_ops;
1278                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1279                 d_add(dentry, inode);
1280         }
1281         bool_num = num;
1282         bool_pending_names = names;
1283         bool_pending_values = values;
1284 
1285         free_page((unsigned long)page);
1286         return 0;
1287 out:
1288         free_page((unsigned long)page);
1289 
1290         if (names) {
1291                 for (i = 0; i < num; i++)
1292                         kfree(names[i]);
1293                 kfree(names);
1294         }
1295         kfree(values);
1296         sel_remove_entries(dir);
1297 
1298         return ret;
1299 }
1300 
1301 #define NULL_FILE_NAME "null"
1302 
1303 struct dentry *selinux_null;
1304 
1305 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1306                                             size_t count, loff_t *ppos)
1307 {
1308         char tmpbuf[TMPBUFLEN];
1309         ssize_t length;
1310 
1311         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1312         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1313 }
1314 
1315 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1316                                              const char __user *buf,
1317                                              size_t count, loff_t *ppos)
1318 
1319 {
1320         char *page = NULL;
1321         ssize_t ret;
1322         int new_value;
1323 
1324         ret = task_has_security(current, SECURITY__SETSECPARAM);
1325         if (ret)
1326                 goto out;
1327 
1328         ret = -ENOMEM;
1329         if (count >= PAGE_SIZE)
1330                 goto out;
1331 
1332         /* No partial writes. */
1333         ret = -EINVAL;
1334         if (*ppos != 0)
1335                 goto out;
1336 
1337         ret = -ENOMEM;
1338         page = (char *)get_zeroed_page(GFP_KERNEL);
1339         if (!page)
1340                 goto out;
1341 
1342         ret = -EFAULT;
1343         if (copy_from_user(page, buf, count))
1344                 goto out;
1345 
1346         ret = -EINVAL;
1347         if (sscanf(page, "%u", &new_value) != 1)
1348                 goto out;
1349 
1350         avc_cache_threshold = new_value;
1351 
1352         ret = count;
1353 out:
1354         free_page((unsigned long)page);
1355         return ret;
1356 }
1357 
1358 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1359                                        size_t count, loff_t *ppos)
1360 {
1361         char *page;
1362         ssize_t length;
1363 
1364         page = (char *)__get_free_page(GFP_KERNEL);
1365         if (!page)
1366                 return -ENOMEM;
1367 
1368         length = avc_get_hash_stats(page);
1369         if (length >= 0)
1370                 length = simple_read_from_buffer(buf, count, ppos, page, length);
1371         free_page((unsigned long)page);
1372 
1373         return length;
1374 }
1375 
1376 static const struct file_operations sel_avc_cache_threshold_ops = {
1377         .read           = sel_read_avc_cache_threshold,
1378         .write          = sel_write_avc_cache_threshold,
1379         .llseek         = generic_file_llseek,
1380 };
1381 
1382 static const struct file_operations sel_avc_hash_stats_ops = {
1383         .read           = sel_read_avc_hash_stats,
1384         .llseek         = generic_file_llseek,
1385 };
1386 
1387 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1388 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1389 {
1390         int cpu;
1391 
1392         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1393                 if (!cpu_possible(cpu))
1394                         continue;
1395                 *idx = cpu + 1;
1396                 return &per_cpu(avc_cache_stats, cpu);
1397         }
1398         return NULL;
1399 }
1400 
1401 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1402 {
1403         loff_t n = *pos - 1;
1404 
1405         if (*pos == 0)
1406                 return SEQ_START_TOKEN;
1407 
1408         return sel_avc_get_stat_idx(&n);
1409 }
1410 
1411 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1412 {
1413         return sel_avc_get_stat_idx(pos);
1414 }
1415 
1416 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1417 {
1418         struct avc_cache_stats *st = v;
1419 
1420         if (v == SEQ_START_TOKEN)
1421                 seq_printf(seq, "lookups hits misses allocations reclaims "
1422                            "frees\n");
1423         else {
1424                 unsigned int lookups = st->lookups;
1425                 unsigned int misses = st->misses;
1426                 unsigned int hits = lookups - misses;
1427                 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1428                            hits, misses, st->allocations,
1429                            st->reclaims, st->frees);
1430         }
1431         return 0;
1432 }
1433 
1434 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1435 { }
1436 
1437 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1438         .start          = sel_avc_stats_seq_start,
1439         .next           = sel_avc_stats_seq_next,
1440         .show           = sel_avc_stats_seq_show,
1441         .stop           = sel_avc_stats_seq_stop,
1442 };
1443 
1444 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1445 {
1446         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1447 }
1448 
1449 static const struct file_operations sel_avc_cache_stats_ops = {
1450         .open           = sel_open_avc_cache_stats,
1451         .read           = seq_read,
1452         .llseek         = seq_lseek,
1453         .release        = seq_release,
1454 };
1455 #endif
1456 
1457 static int sel_make_avc_files(struct dentry *dir)
1458 {
1459         int i;
1460         static struct tree_descr files[] = {
1461                 { "cache_threshold",
1462                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1463                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1464 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1465                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1466 #endif
1467         };
1468 
1469         for (i = 0; i < ARRAY_SIZE(files); i++) {
1470                 struct inode *inode;
1471                 struct dentry *dentry;
1472 
1473                 dentry = d_alloc_name(dir, files[i].name);
1474                 if (!dentry)
1475                         return -ENOMEM;
1476 
1477                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1478                 if (!inode)
1479                         return -ENOMEM;
1480 
1481                 inode->i_fop = files[i].ops;
1482                 inode->i_ino = ++sel_last_ino;
1483                 d_add(dentry, inode);
1484         }
1485 
1486         return 0;
1487 }
1488 
1489 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1490                                 size_t count, loff_t *ppos)
1491 {
1492         struct inode *inode;
1493         char *con;
1494         u32 sid, len;
1495         ssize_t ret;
1496 
1497         inode = file->f_path.dentry->d_inode;
1498         sid = inode->i_ino&SEL_INO_MASK;
1499         ret = security_sid_to_context(sid, &con, &len);
1500         if (ret)
1501                 return ret;
1502 
1503         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1504         kfree(con);
1505         return ret;
1506 }
1507 
1508 static const struct file_operations sel_initcon_ops = {
1509         .read           = sel_read_initcon,
1510         .llseek         = generic_file_llseek,
1511 };
1512 
1513 static int sel_make_initcon_files(struct dentry *dir)
1514 {
1515         int i;
1516 
1517         for (i = 1; i <= SECINITSID_NUM; i++) {
1518                 struct inode *inode;
1519                 struct dentry *dentry;
1520                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1521                 if (!dentry)
1522                         return -ENOMEM;
1523 
1524                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1525                 if (!inode)
1526                         return -ENOMEM;
1527 
1528                 inode->i_fop = &sel_initcon_ops;
1529                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1530                 d_add(dentry, inode);
1531         }
1532 
1533         return 0;
1534 }
1535 
1536 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1537 {
1538         return a / b - (a % b < 0);
1539 }
1540 
1541 static inline unsigned long sel_class_to_ino(u16 class)
1542 {
1543         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1544 }
1545 
1546 static inline u16 sel_ino_to_class(unsigned long ino)
1547 {
1548         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1549 }
1550 
1551 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1552 {
1553         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1554 }
1555 
1556 static inline u32 sel_ino_to_perm(unsigned long ino)
1557 {
1558         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1559 }
1560 
1561 static ssize_t sel_read_class(struct file *file, char __user *buf,
1562                                 size_t count, loff_t *ppos)
1563 {
1564         ssize_t rc, len;
1565         char *page;
1566         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1567 
1568         page = (char *)__get_free_page(GFP_KERNEL);
1569         if (!page)
1570                 return -ENOMEM;
1571 
1572         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1573         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1574         free_page((unsigned long)page);
1575 
1576         return rc;
1577 }
1578 
1579 static const struct file_operations sel_class_ops = {
1580         .read           = sel_read_class,
1581         .llseek         = generic_file_llseek,
1582 };
1583 
1584 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1585                                 size_t count, loff_t *ppos)
1586 {
1587         ssize_t rc, len;
1588         char *page;
1589         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1590 
1591         page = (char *)__get_free_page(GFP_KERNEL);
1592         if (!page)
1593                 return -ENOMEM;
1594 
1595         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1596         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1597         free_page((unsigned long)page);
1598 
1599         return rc;
1600 }
1601 
1602 static const struct file_operations sel_perm_ops = {
1603         .read           = sel_read_perm,
1604         .llseek         = generic_file_llseek,
1605 };
1606 
1607 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1608                                   size_t count, loff_t *ppos)
1609 {
1610         int value;
1611         char tmpbuf[TMPBUFLEN];
1612         ssize_t length;
1613         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1614 
1615         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1616         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1617 
1618         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1619 }
1620 
1621 static const struct file_operations sel_policycap_ops = {
1622         .read           = sel_read_policycap,
1623         .llseek         = generic_file_llseek,
1624 };
1625 
1626 static int sel_make_perm_files(char *objclass, int classvalue,
1627                                 struct dentry *dir)
1628 {
1629         int i, rc, nperms;
1630         char **perms;
1631 
1632         rc = security_get_permissions(objclass, &perms, &nperms);
1633         if (rc)
1634                 return rc;
1635 
1636         for (i = 0; i < nperms; i++) {
1637                 struct inode *inode;
1638                 struct dentry *dentry;
1639 
1640                 rc = -ENOMEM;
1641                 dentry = d_alloc_name(dir, perms[i]);
1642                 if (!dentry)
1643                         goto out;
1644 
1645                 rc = -ENOMEM;
1646                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1647                 if (!inode)
1648                         goto out;
1649 
1650                 inode->i_fop = &sel_perm_ops;
1651                 /* i+1 since perm values are 1-indexed */
1652                 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1653                 d_add(dentry, inode);
1654         }
1655         rc = 0;
1656 out:
1657         for (i = 0; i < nperms; i++)
1658                 kfree(perms[i]);
1659         kfree(perms);
1660         return rc;
1661 }
1662 
1663 static int sel_make_class_dir_entries(char *classname, int index,
1664                                         struct dentry *dir)
1665 {
1666         struct dentry *dentry = NULL;
1667         struct inode *inode = NULL;
1668         int rc;
1669 
1670         dentry = d_alloc_name(dir, "index");
1671         if (!dentry)
1672                 return -ENOMEM;
1673 
1674         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1675         if (!inode)
1676                 return -ENOMEM;
1677 
1678         inode->i_fop = &sel_class_ops;
1679         inode->i_ino = sel_class_to_ino(index);
1680         d_add(dentry, inode);
1681 
1682         dentry = d_alloc_name(dir, "perms");
1683         if (!dentry)
1684                 return -ENOMEM;
1685 
1686         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1687         if (rc)
1688                 return rc;
1689 
1690         rc = sel_make_perm_files(classname, index, dentry);
1691 
1692         return rc;
1693 }
1694 
1695 static void sel_remove_classes(void)
1696 {
1697         struct list_head *class_node;
1698 
1699         list_for_each(class_node, &class_dir->d_subdirs) {
1700                 struct dentry *class_subdir = list_entry(class_node,
1701                                         struct dentry, d_u.d_child);
1702                 struct list_head *class_subdir_node;
1703 
1704                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1705                         struct dentry *d = list_entry(class_subdir_node,
1706                                                 struct dentry, d_u.d_child);
1707 
1708                         if (d->d_inode)
1709                                 if (d->d_inode->i_mode & S_IFDIR)
1710                                         sel_remove_entries(d);
1711                 }
1712 
1713                 sel_remove_entries(class_subdir);
1714         }
1715 
1716         sel_remove_entries(class_dir);
1717 }
1718 
1719 static int sel_make_classes(void)
1720 {
1721         int rc, nclasses, i;
1722         char **classes;
1723 
1724         /* delete any existing entries */
1725         sel_remove_classes();
1726 
1727         rc = security_get_classes(&classes, &nclasses);
1728         if (rc)
1729                 return rc;
1730 
1731         /* +2 since classes are 1-indexed */
1732         last_class_ino = sel_class_to_ino(nclasses + 2);
1733 
1734         for (i = 0; i < nclasses; i++) {
1735                 struct dentry *class_name_dir;
1736 
1737                 rc = -ENOMEM;
1738                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1739                 if (!class_name_dir)
1740                         goto out;
1741 
1742                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1743                                 &last_class_ino);
1744                 if (rc)
1745                         goto out;
1746 
1747                 /* i+1 since class values are 1-indexed */
1748                 rc = sel_make_class_dir_entries(classes[i], i + 1,
1749                                 class_name_dir);
1750                 if (rc)
1751                         goto out;
1752         }
1753         rc = 0;
1754 out:
1755         for (i = 0; i < nclasses; i++)
1756                 kfree(classes[i]);
1757         kfree(classes);
1758         return rc;
1759 }
1760 
1761 static int sel_make_policycap(void)
1762 {
1763         unsigned int iter;
1764         struct dentry *dentry = NULL;
1765         struct inode *inode = NULL;
1766 
1767         sel_remove_entries(policycap_dir);
1768 
1769         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1770                 if (iter < ARRAY_SIZE(policycap_names))
1771                         dentry = d_alloc_name(policycap_dir,
1772                                               policycap_names[iter]);
1773                 else
1774                         dentry = d_alloc_name(policycap_dir, "unknown");
1775 
1776                 if (dentry == NULL)
1777                         return -ENOMEM;
1778 
1779                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1780                 if (inode == NULL)
1781                         return -ENOMEM;
1782 
1783                 inode->i_fop = &sel_policycap_ops;
1784                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1785                 d_add(dentry, inode);
1786         }
1787 
1788         return 0;
1789 }
1790 
1791 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1792                         unsigned long *ino)
1793 {
1794         struct inode *inode;
1795 
1796         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1797         if (!inode)
1798                 return -ENOMEM;
1799 
1800         inode->i_op = &simple_dir_inode_operations;
1801         inode->i_fop = &simple_dir_operations;
1802         inode->i_ino = ++(*ino);
1803         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1804         inc_nlink(inode);
1805         d_add(dentry, inode);
1806         /* bump link count on parent directory, too */
1807         inc_nlink(dir);
1808 
1809         return 0;
1810 }
1811 
1812 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1813 {
1814         int ret;
1815         struct dentry *dentry;
1816         struct inode *inode, *root_inode;
1817         struct inode_security_struct *isec;
1818 
1819         static struct tree_descr selinux_files[] = {
1820                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1821                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1822                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1823                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1824                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1825                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1826                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1827                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1828                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1829                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1830                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1831                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1832                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1833                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1834                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1835                 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1836                 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1837                 /* last one */ {""}
1838         };
1839         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1840         if (ret)
1841                 goto err;
1842 
1843         root_inode = sb->s_root->d_inode;
1844 
1845         ret = -ENOMEM;
1846         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1847         if (!dentry)
1848                 goto err;
1849 
1850         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1851         if (ret)
1852                 goto err;
1853 
1854         bool_dir = dentry;
1855 
1856         ret = -ENOMEM;
1857         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1858         if (!dentry)
1859                 goto err;
1860 
1861         ret = -ENOMEM;
1862         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1863         if (!inode)
1864                 goto err;
1865 
1866         inode->i_ino = ++sel_last_ino;
1867         isec = (struct inode_security_struct *)inode->i_security;
1868         isec->sid = SECINITSID_DEVNULL;
1869         isec->sclass = SECCLASS_CHR_FILE;
1870         isec->initialized = 1;
1871 
1872         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1873         d_add(dentry, inode);
1874         selinux_null = dentry;
1875 
1876         ret = -ENOMEM;
1877         dentry = d_alloc_name(sb->s_root, "avc");
1878         if (!dentry)
1879                 goto err;
1880 
1881         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1882         if (ret)
1883                 goto err;
1884 
1885         ret = sel_make_avc_files(dentry);
1886         if (ret)
1887                 goto err;
1888 
1889         ret = -ENOMEM;
1890         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1891         if (!dentry)
1892                 goto err;
1893 
1894         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1895         if (ret)
1896                 goto err;
1897 
1898         ret = sel_make_initcon_files(dentry);
1899         if (ret)
1900                 goto err;
1901 
1902         ret = -ENOMEM;
1903         dentry = d_alloc_name(sb->s_root, "class");
1904         if (!dentry)
1905                 goto err;
1906 
1907         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1908         if (ret)
1909                 goto err;
1910 
1911         class_dir = dentry;
1912 
1913         ret = -ENOMEM;
1914         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1915         if (!dentry)
1916                 goto err;
1917 
1918         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1919         if (ret)
1920                 goto err;
1921 
1922         policycap_dir = dentry;
1923 
1924         return 0;
1925 err:
1926         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1927                 __func__);
1928         return ret;
1929 }
1930 
1931 static struct dentry *sel_mount(struct file_system_type *fs_type,
1932                       int flags, const char *dev_name, void *data)
1933 {
1934         return mount_single(fs_type, flags, data, sel_fill_super);
1935 }
1936 
1937 static struct file_system_type sel_fs_type = {
1938         .name           = "selinuxfs",
1939         .mount          = sel_mount,
1940         .kill_sb        = kill_litter_super,
1941 };
1942 
1943 struct vfsmount *selinuxfs_mount;
1944 static struct kobject *selinuxfs_kobj;
1945 
1946 static int __init init_sel_fs(void)
1947 {
1948         int err;
1949 
1950         if (!selinux_enabled)
1951                 return 0;
1952 
1953         selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1954         if (!selinuxfs_kobj)
1955                 return -ENOMEM;
1956 
1957         err = register_filesystem(&sel_fs_type);
1958         if (err) {
1959                 kobject_put(selinuxfs_kobj);
1960                 return err;
1961         }
1962 
1963         selinuxfs_mount = kern_mount(&sel_fs_type);
1964         if (IS_ERR(selinuxfs_mount)) {
1965                 printk(KERN_ERR "selinuxfs:  could not mount!\n");
1966                 err = PTR_ERR(selinuxfs_mount);
1967                 selinuxfs_mount = NULL;
1968         }
1969 
1970         return err;
1971 }
1972 
1973 __initcall(init_sel_fs);
1974 
1975 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1976 void exit_sel_fs(void)
1977 {
1978         kobject_put(selinuxfs_kobj);
1979         kern_unmount(selinuxfs_mount);
1980         unregister_filesystem(&sel_fs_type);
1981 }
1982 #endif
1983 

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