Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * NSA Security-Enhanced Linux (SELinux) security module | |
3 | * | |
4 | * This file contains the SELinux hook function implementations. | |
5 | * | |
6 | * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> | |
828dfe1d EP |
7 | * Chris Vance, <cvance@nai.com> |
8 | * Wayne Salamon, <wsalamon@nai.com> | |
9 | * James Morris <jmorris@redhat.com> | |
1da177e4 LT |
10 | * |
11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. | |
2069f457 EP |
12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> |
13 | * Eric Paris <eparis@redhat.com> | |
1da177e4 | 14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
828dfe1d | 15 | * <dgoeddel@trustedcs.com> |
effad8df | 16 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
828dfe1d | 17 | * Paul Moore <paul.moore@hp.com> |
788e7dd4 | 18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
828dfe1d | 19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
1da177e4 LT |
20 | * |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License version 2, | |
828dfe1d | 23 | * as published by the Free Software Foundation. |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
0d094efe | 28 | #include <linux/tracehook.h> |
1da177e4 LT |
29 | #include <linux/errno.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/security.h> | |
32 | #include <linux/xattr.h> | |
33 | #include <linux/capability.h> | |
34 | #include <linux/unistd.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/mman.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/pagemap.h> | |
39 | #include <linux/swap.h> | |
1da177e4 LT |
40 | #include <linux/spinlock.h> |
41 | #include <linux/syscalls.h> | |
42 | #include <linux/file.h> | |
9f3acc31 | 43 | #include <linux/fdtable.h> |
1da177e4 LT |
44 | #include <linux/namei.h> |
45 | #include <linux/mount.h> | |
1da177e4 | 46 | #include <linux/proc_fs.h> |
1da177e4 LT |
47 | #include <linux/netfilter_ipv4.h> |
48 | #include <linux/netfilter_ipv6.h> | |
49 | #include <linux/tty.h> | |
50 | #include <net/icmp.h> | |
227b60f5 | 51 | #include <net/ip.h> /* for local_port_range[] */ |
1da177e4 | 52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
220deb96 | 53 | #include <net/net_namespace.h> |
d621d35e | 54 | #include <net/netlabel.h> |
f5269710 | 55 | #include <linux/uaccess.h> |
1da177e4 | 56 | #include <asm/ioctls.h> |
d621d35e | 57 | #include <asm/atomic.h> |
1da177e4 LT |
58 | #include <linux/bitops.h> |
59 | #include <linux/interrupt.h> | |
60 | #include <linux/netdevice.h> /* for network interface checks */ | |
61 | #include <linux/netlink.h> | |
62 | #include <linux/tcp.h> | |
63 | #include <linux/udp.h> | |
2ee92d46 | 64 | #include <linux/dccp.h> |
1da177e4 LT |
65 | #include <linux/quota.h> |
66 | #include <linux/un.h> /* for Unix socket types */ | |
67 | #include <net/af_unix.h> /* for Unix socket types */ | |
68 | #include <linux/parser.h> | |
69 | #include <linux/nfs_mount.h> | |
70 | #include <net/ipv6.h> | |
71 | #include <linux/hugetlb.h> | |
72 | #include <linux/personality.h> | |
73 | #include <linux/sysctl.h> | |
74 | #include <linux/audit.h> | |
6931dfc9 | 75 | #include <linux/string.h> |
877ce7c1 | 76 | #include <linux/selinux.h> |
23970741 | 77 | #include <linux/mutex.h> |
f06febc9 | 78 | #include <linux/posix-timers.h> |
1da177e4 LT |
79 | |
80 | #include "avc.h" | |
81 | #include "objsec.h" | |
82 | #include "netif.h" | |
224dfbd8 | 83 | #include "netnode.h" |
3e112172 | 84 | #include "netport.h" |
d28d1e08 | 85 | #include "xfrm.h" |
c60475bf | 86 | #include "netlabel.h" |
9d57a7f9 | 87 | #include "audit.h" |
1da177e4 LT |
88 | |
89 | #define XATTR_SELINUX_SUFFIX "selinux" | |
90 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX | |
91 | ||
c9180a57 EP |
92 | #define NUM_SEL_MNT_OPTS 4 |
93 | ||
1da177e4 LT |
94 | extern unsigned int policydb_loaded_version; |
95 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
4e5ab4cb | 96 | extern int selinux_compat_net; |
20510f2f | 97 | extern struct security_operations *security_ops; |
1da177e4 | 98 | |
d621d35e PM |
99 | /* SECMARK reference count */ |
100 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); | |
101 | ||
1da177e4 | 102 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
828dfe1d | 103 | int selinux_enforcing; |
1da177e4 LT |
104 | |
105 | static int __init enforcing_setup(char *str) | |
106 | { | |
f5269710 EP |
107 | unsigned long enforcing; |
108 | if (!strict_strtoul(str, 0, &enforcing)) | |
109 | selinux_enforcing = enforcing ? 1 : 0; | |
1da177e4 LT |
110 | return 1; |
111 | } | |
112 | __setup("enforcing=", enforcing_setup); | |
113 | #endif | |
114 | ||
115 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
116 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
117 | ||
118 | static int __init selinux_enabled_setup(char *str) | |
119 | { | |
f5269710 EP |
120 | unsigned long enabled; |
121 | if (!strict_strtoul(str, 0, &enabled)) | |
122 | selinux_enabled = enabled ? 1 : 0; | |
1da177e4 LT |
123 | return 1; |
124 | } | |
125 | __setup("selinux=", selinux_enabled_setup); | |
30d55280 SS |
126 | #else |
127 | int selinux_enabled = 1; | |
1da177e4 LT |
128 | #endif |
129 | ||
1da177e4 | 130 | |
6f0f0fd4 JM |
131 | /* |
132 | * Minimal support for a secondary security module, | |
133 | * just to allow the use of the capability module. | |
134 | */ | |
828dfe1d | 135 | static struct security_operations *secondary_ops; |
1da177e4 LT |
136 | |
137 | /* Lists of inode and superblock security structures initialized | |
138 | before the policy was loaded. */ | |
139 | static LIST_HEAD(superblock_security_head); | |
140 | static DEFINE_SPINLOCK(sb_security_lock); | |
141 | ||
e18b890b | 142 | static struct kmem_cache *sel_inode_cache; |
7cae7e26 | 143 | |
d621d35e PM |
144 | /** |
145 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled | |
146 | * | |
147 | * Description: | |
148 | * This function checks the SECMARK reference counter to see if any SECMARK | |
149 | * targets are currently configured, if the reference counter is greater than | |
150 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is | |
151 | * enabled, false (0) if SECMARK is disabled. | |
152 | * | |
153 | */ | |
154 | static int selinux_secmark_enabled(void) | |
155 | { | |
156 | return (atomic_read(&selinux_secmark_refcount) > 0); | |
157 | } | |
158 | ||
d84f4f99 DH |
159 | /* |
160 | * initialise the security for the init task | |
161 | */ | |
162 | static void cred_init_security(void) | |
1da177e4 | 163 | { |
3b11a1de | 164 | struct cred *cred = (struct cred *) current->real_cred; |
1da177e4 LT |
165 | struct task_security_struct *tsec; |
166 | ||
89d155ef | 167 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
1da177e4 | 168 | if (!tsec) |
d84f4f99 | 169 | panic("SELinux: Failed to initialize initial task.\n"); |
1da177e4 | 170 | |
d84f4f99 | 171 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
f1752eec | 172 | cred->security = tsec; |
1da177e4 LT |
173 | } |
174 | ||
88e67f3b DH |
175 | /* |
176 | * get the security ID of a set of credentials | |
177 | */ | |
178 | static inline u32 cred_sid(const struct cred *cred) | |
179 | { | |
180 | const struct task_security_struct *tsec; | |
181 | ||
182 | tsec = cred->security; | |
183 | return tsec->sid; | |
184 | } | |
185 | ||
275bb41e | 186 | /* |
3b11a1de | 187 | * get the objective security ID of a task |
275bb41e DH |
188 | */ |
189 | static inline u32 task_sid(const struct task_struct *task) | |
190 | { | |
275bb41e DH |
191 | u32 sid; |
192 | ||
193 | rcu_read_lock(); | |
88e67f3b | 194 | sid = cred_sid(__task_cred(task)); |
275bb41e DH |
195 | rcu_read_unlock(); |
196 | return sid; | |
197 | } | |
198 | ||
199 | /* | |
3b11a1de | 200 | * get the subjective security ID of the current task |
275bb41e DH |
201 | */ |
202 | static inline u32 current_sid(void) | |
203 | { | |
204 | const struct task_security_struct *tsec = current_cred()->security; | |
205 | ||
206 | return tsec->sid; | |
207 | } | |
208 | ||
88e67f3b DH |
209 | /* Allocate and free functions for each kind of security blob. */ |
210 | ||
1da177e4 LT |
211 | static int inode_alloc_security(struct inode *inode) |
212 | { | |
1da177e4 | 213 | struct inode_security_struct *isec; |
275bb41e | 214 | u32 sid = current_sid(); |
1da177e4 | 215 | |
a02fe132 | 216 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
1da177e4 LT |
217 | if (!isec) |
218 | return -ENOMEM; | |
219 | ||
23970741 | 220 | mutex_init(&isec->lock); |
1da177e4 | 221 | INIT_LIST_HEAD(&isec->list); |
1da177e4 LT |
222 | isec->inode = inode; |
223 | isec->sid = SECINITSID_UNLABELED; | |
224 | isec->sclass = SECCLASS_FILE; | |
275bb41e | 225 | isec->task_sid = sid; |
1da177e4 LT |
226 | inode->i_security = isec; |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static void inode_free_security(struct inode *inode) | |
232 | { | |
233 | struct inode_security_struct *isec = inode->i_security; | |
234 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
235 | ||
1da177e4 LT |
236 | spin_lock(&sbsec->isec_lock); |
237 | if (!list_empty(&isec->list)) | |
238 | list_del_init(&isec->list); | |
239 | spin_unlock(&sbsec->isec_lock); | |
240 | ||
241 | inode->i_security = NULL; | |
7cae7e26 | 242 | kmem_cache_free(sel_inode_cache, isec); |
1da177e4 LT |
243 | } |
244 | ||
245 | static int file_alloc_security(struct file *file) | |
246 | { | |
1da177e4 | 247 | struct file_security_struct *fsec; |
275bb41e | 248 | u32 sid = current_sid(); |
1da177e4 | 249 | |
26d2a4be | 250 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
1da177e4 LT |
251 | if (!fsec) |
252 | return -ENOMEM; | |
253 | ||
275bb41e DH |
254 | fsec->sid = sid; |
255 | fsec->fown_sid = sid; | |
1da177e4 LT |
256 | file->f_security = fsec; |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static void file_free_security(struct file *file) | |
262 | { | |
263 | struct file_security_struct *fsec = file->f_security; | |
1da177e4 LT |
264 | file->f_security = NULL; |
265 | kfree(fsec); | |
266 | } | |
267 | ||
268 | static int superblock_alloc_security(struct super_block *sb) | |
269 | { | |
270 | struct superblock_security_struct *sbsec; | |
271 | ||
89d155ef | 272 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
1da177e4 LT |
273 | if (!sbsec) |
274 | return -ENOMEM; | |
275 | ||
bc7e982b | 276 | mutex_init(&sbsec->lock); |
1da177e4 LT |
277 | INIT_LIST_HEAD(&sbsec->list); |
278 | INIT_LIST_HEAD(&sbsec->isec_head); | |
279 | spin_lock_init(&sbsec->isec_lock); | |
1da177e4 LT |
280 | sbsec->sb = sb; |
281 | sbsec->sid = SECINITSID_UNLABELED; | |
282 | sbsec->def_sid = SECINITSID_FILE; | |
c312feb2 | 283 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
1da177e4 LT |
284 | sb->s_security = sbsec; |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static void superblock_free_security(struct super_block *sb) | |
290 | { | |
291 | struct superblock_security_struct *sbsec = sb->s_security; | |
292 | ||
1da177e4 LT |
293 | spin_lock(&sb_security_lock); |
294 | if (!list_empty(&sbsec->list)) | |
295 | list_del_init(&sbsec->list); | |
296 | spin_unlock(&sb_security_lock); | |
297 | ||
298 | sb->s_security = NULL; | |
299 | kfree(sbsec); | |
300 | } | |
301 | ||
7d877f3b | 302 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
1da177e4 LT |
303 | { |
304 | struct sk_security_struct *ssec; | |
305 | ||
89d155ef | 306 | ssec = kzalloc(sizeof(*ssec), priority); |
1da177e4 LT |
307 | if (!ssec) |
308 | return -ENOMEM; | |
309 | ||
1da177e4 | 310 | ssec->peer_sid = SECINITSID_UNLABELED; |
892c141e | 311 | ssec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
312 | sk->sk_security = ssec; |
313 | ||
f74af6e8 | 314 | selinux_netlbl_sk_security_reset(ssec, family); |
99f59ed0 | 315 | |
1da177e4 LT |
316 | return 0; |
317 | } | |
318 | ||
319 | static void sk_free_security(struct sock *sk) | |
320 | { | |
321 | struct sk_security_struct *ssec = sk->sk_security; | |
322 | ||
1da177e4 | 323 | sk->sk_security = NULL; |
6c5b3fc0 | 324 | selinux_netlbl_sk_security_free(ssec); |
1da177e4 LT |
325 | kfree(ssec); |
326 | } | |
1da177e4 LT |
327 | |
328 | /* The security server must be initialized before | |
329 | any labeling or access decisions can be provided. */ | |
330 | extern int ss_initialized; | |
331 | ||
332 | /* The file system's label must be initialized prior to use. */ | |
333 | ||
334 | static char *labeling_behaviors[6] = { | |
335 | "uses xattr", | |
336 | "uses transition SIDs", | |
337 | "uses task SIDs", | |
338 | "uses genfs_contexts", | |
339 | "not configured for labeling", | |
340 | "uses mountpoint labeling", | |
341 | }; | |
342 | ||
343 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
344 | ||
345 | static inline int inode_doinit(struct inode *inode) | |
346 | { | |
347 | return inode_doinit_with_dentry(inode, NULL); | |
348 | } | |
349 | ||
350 | enum { | |
31e87930 | 351 | Opt_error = -1, |
1da177e4 LT |
352 | Opt_context = 1, |
353 | Opt_fscontext = 2, | |
c9180a57 EP |
354 | Opt_defcontext = 3, |
355 | Opt_rootcontext = 4, | |
1da177e4 LT |
356 | }; |
357 | ||
a447c093 | 358 | static const match_table_t tokens = { |
832cbd9a EP |
359 | {Opt_context, CONTEXT_STR "%s"}, |
360 | {Opt_fscontext, FSCONTEXT_STR "%s"}, | |
361 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, | |
362 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, | |
31e87930 | 363 | {Opt_error, NULL}, |
1da177e4 LT |
364 | }; |
365 | ||
366 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
367 | ||
c312feb2 EP |
368 | static int may_context_mount_sb_relabel(u32 sid, |
369 | struct superblock_security_struct *sbsec, | |
275bb41e | 370 | const struct cred *cred) |
c312feb2 | 371 | { |
275bb41e | 372 | const struct task_security_struct *tsec = cred->security; |
c312feb2 EP |
373 | int rc; |
374 | ||
375 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
376 | FILESYSTEM__RELABELFROM, NULL); | |
377 | if (rc) | |
378 | return rc; | |
379 | ||
380 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
381 | FILESYSTEM__RELABELTO, NULL); | |
382 | return rc; | |
383 | } | |
384 | ||
0808925e EP |
385 | static int may_context_mount_inode_relabel(u32 sid, |
386 | struct superblock_security_struct *sbsec, | |
275bb41e | 387 | const struct cred *cred) |
0808925e | 388 | { |
275bb41e | 389 | const struct task_security_struct *tsec = cred->security; |
0808925e EP |
390 | int rc; |
391 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
392 | FILESYSTEM__RELABELFROM, NULL); | |
393 | if (rc) | |
394 | return rc; | |
395 | ||
396 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
397 | FILESYSTEM__ASSOCIATE, NULL); | |
398 | return rc; | |
399 | } | |
400 | ||
c9180a57 | 401 | static int sb_finish_set_opts(struct super_block *sb) |
1da177e4 | 402 | { |
1da177e4 | 403 | struct superblock_security_struct *sbsec = sb->s_security; |
c9180a57 EP |
404 | struct dentry *root = sb->s_root; |
405 | struct inode *root_inode = root->d_inode; | |
406 | int rc = 0; | |
1da177e4 | 407 | |
c9180a57 EP |
408 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
409 | /* Make sure that the xattr handler exists and that no | |
410 | error other than -ENODATA is returned by getxattr on | |
411 | the root directory. -ENODATA is ok, as this may be | |
412 | the first boot of the SELinux kernel before we have | |
413 | assigned xattr values to the filesystem. */ | |
414 | if (!root_inode->i_op->getxattr) { | |
415 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
416 | "xattr support\n", sb->s_id, sb->s_type->name); | |
417 | rc = -EOPNOTSUPP; | |
418 | goto out; | |
419 | } | |
420 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
421 | if (rc < 0 && rc != -ENODATA) { | |
422 | if (rc == -EOPNOTSUPP) | |
423 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
424 | "%s) has no security xattr handler\n", | |
425 | sb->s_id, sb->s_type->name); | |
426 | else | |
427 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
428 | "%s) getxattr errno %d\n", sb->s_id, | |
429 | sb->s_type->name, -rc); | |
430 | goto out; | |
431 | } | |
432 | } | |
1da177e4 | 433 | |
c9180a57 | 434 | sbsec->initialized = 1; |
1da177e4 | 435 | |
c9180a57 EP |
436 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
437 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
438 | sb->s_id, sb->s_type->name); | |
439 | else | |
440 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
441 | sb->s_id, sb->s_type->name, | |
442 | labeling_behaviors[sbsec->behavior-1]); | |
1da177e4 | 443 | |
c9180a57 EP |
444 | /* Initialize the root inode. */ |
445 | rc = inode_doinit_with_dentry(root_inode, root); | |
1da177e4 | 446 | |
c9180a57 EP |
447 | /* Initialize any other inodes associated with the superblock, e.g. |
448 | inodes created prior to initial policy load or inodes created | |
449 | during get_sb by a pseudo filesystem that directly | |
450 | populates itself. */ | |
451 | spin_lock(&sbsec->isec_lock); | |
452 | next_inode: | |
453 | if (!list_empty(&sbsec->isec_head)) { | |
454 | struct inode_security_struct *isec = | |
455 | list_entry(sbsec->isec_head.next, | |
456 | struct inode_security_struct, list); | |
457 | struct inode *inode = isec->inode; | |
458 | spin_unlock(&sbsec->isec_lock); | |
459 | inode = igrab(inode); | |
460 | if (inode) { | |
461 | if (!IS_PRIVATE(inode)) | |
462 | inode_doinit(inode); | |
463 | iput(inode); | |
464 | } | |
465 | spin_lock(&sbsec->isec_lock); | |
466 | list_del_init(&isec->list); | |
467 | goto next_inode; | |
468 | } | |
469 | spin_unlock(&sbsec->isec_lock); | |
470 | out: | |
471 | return rc; | |
472 | } | |
1da177e4 | 473 | |
c9180a57 EP |
474 | /* |
475 | * This function should allow an FS to ask what it's mount security | |
476 | * options were so it can use those later for submounts, displaying | |
477 | * mount options, or whatever. | |
478 | */ | |
479 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
e0007529 | 480 | struct security_mnt_opts *opts) |
c9180a57 EP |
481 | { |
482 | int rc = 0, i; | |
483 | struct superblock_security_struct *sbsec = sb->s_security; | |
484 | char *context = NULL; | |
485 | u32 len; | |
486 | char tmp; | |
1da177e4 | 487 | |
e0007529 | 488 | security_init_mnt_opts(opts); |
1da177e4 | 489 | |
c9180a57 EP |
490 | if (!sbsec->initialized) |
491 | return -EINVAL; | |
1da177e4 | 492 | |
c9180a57 EP |
493 | if (!ss_initialized) |
494 | return -EINVAL; | |
1da177e4 | 495 | |
c9180a57 EP |
496 | /* |
497 | * if we ever use sbsec flags for anything other than tracking mount | |
498 | * settings this is going to need a mask | |
499 | */ | |
500 | tmp = sbsec->flags; | |
501 | /* count the number of mount options for this sb */ | |
502 | for (i = 0; i < 8; i++) { | |
503 | if (tmp & 0x01) | |
e0007529 | 504 | opts->num_mnt_opts++; |
c9180a57 EP |
505 | tmp >>= 1; |
506 | } | |
1da177e4 | 507 | |
e0007529 EP |
508 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
509 | if (!opts->mnt_opts) { | |
c9180a57 EP |
510 | rc = -ENOMEM; |
511 | goto out_free; | |
512 | } | |
1da177e4 | 513 | |
e0007529 EP |
514 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
515 | if (!opts->mnt_opts_flags) { | |
c9180a57 EP |
516 | rc = -ENOMEM; |
517 | goto out_free; | |
518 | } | |
1da177e4 | 519 | |
c9180a57 EP |
520 | i = 0; |
521 | if (sbsec->flags & FSCONTEXT_MNT) { | |
522 | rc = security_sid_to_context(sbsec->sid, &context, &len); | |
523 | if (rc) | |
524 | goto out_free; | |
e0007529 EP |
525 | opts->mnt_opts[i] = context; |
526 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; | |
c9180a57 EP |
527 | } |
528 | if (sbsec->flags & CONTEXT_MNT) { | |
529 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); | |
530 | if (rc) | |
531 | goto out_free; | |
e0007529 EP |
532 | opts->mnt_opts[i] = context; |
533 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; | |
c9180a57 EP |
534 | } |
535 | if (sbsec->flags & DEFCONTEXT_MNT) { | |
536 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); | |
537 | if (rc) | |
538 | goto out_free; | |
e0007529 EP |
539 | opts->mnt_opts[i] = context; |
540 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
541 | } |
542 | if (sbsec->flags & ROOTCONTEXT_MNT) { | |
543 | struct inode *root = sbsec->sb->s_root->d_inode; | |
544 | struct inode_security_struct *isec = root->i_security; | |
0808925e | 545 | |
c9180a57 EP |
546 | rc = security_sid_to_context(isec->sid, &context, &len); |
547 | if (rc) | |
548 | goto out_free; | |
e0007529 EP |
549 | opts->mnt_opts[i] = context; |
550 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; | |
c9180a57 | 551 | } |
1da177e4 | 552 | |
e0007529 | 553 | BUG_ON(i != opts->num_mnt_opts); |
1da177e4 | 554 | |
c9180a57 EP |
555 | return 0; |
556 | ||
557 | out_free: | |
e0007529 | 558 | security_free_mnt_opts(opts); |
c9180a57 EP |
559 | return rc; |
560 | } | |
1da177e4 | 561 | |
c9180a57 EP |
562 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
563 | u32 old_sid, u32 new_sid) | |
564 | { | |
565 | /* check if the old mount command had the same options */ | |
566 | if (sbsec->initialized) | |
567 | if (!(sbsec->flags & flag) || | |
568 | (old_sid != new_sid)) | |
569 | return 1; | |
570 | ||
571 | /* check if we were passed the same options twice, | |
572 | * aka someone passed context=a,context=b | |
573 | */ | |
574 | if (!sbsec->initialized) | |
575 | if (sbsec->flags & flag) | |
576 | return 1; | |
577 | return 0; | |
578 | } | |
e0007529 | 579 | |
c9180a57 EP |
580 | /* |
581 | * Allow filesystems with binary mount data to explicitly set mount point | |
582 | * labeling information. | |
583 | */ | |
e0007529 EP |
584 | static int selinux_set_mnt_opts(struct super_block *sb, |
585 | struct security_mnt_opts *opts) | |
c9180a57 | 586 | { |
275bb41e | 587 | const struct cred *cred = current_cred(); |
c9180a57 | 588 | int rc = 0, i; |
c9180a57 EP |
589 | struct superblock_security_struct *sbsec = sb->s_security; |
590 | const char *name = sb->s_type->name; | |
089be43e JM |
591 | struct inode *inode = sbsec->sb->s_root->d_inode; |
592 | struct inode_security_struct *root_isec = inode->i_security; | |
c9180a57 EP |
593 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
594 | u32 defcontext_sid = 0; | |
e0007529 EP |
595 | char **mount_options = opts->mnt_opts; |
596 | int *flags = opts->mnt_opts_flags; | |
597 | int num_opts = opts->num_mnt_opts; | |
c9180a57 EP |
598 | |
599 | mutex_lock(&sbsec->lock); | |
600 | ||
601 | if (!ss_initialized) { | |
602 | if (!num_opts) { | |
603 | /* Defer initialization until selinux_complete_init, | |
604 | after the initial policy is loaded and the security | |
605 | server is ready to handle calls. */ | |
606 | spin_lock(&sb_security_lock); | |
607 | if (list_empty(&sbsec->list)) | |
608 | list_add(&sbsec->list, &superblock_security_head); | |
609 | spin_unlock(&sb_security_lock); | |
610 | goto out; | |
611 | } | |
612 | rc = -EINVAL; | |
744ba35e EP |
613 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
614 | "before the security server is initialized\n"); | |
1da177e4 | 615 | goto out; |
c9180a57 | 616 | } |
1da177e4 | 617 | |
e0007529 EP |
618 | /* |
619 | * Binary mount data FS will come through this function twice. Once | |
620 | * from an explicit call and once from the generic calls from the vfs. | |
621 | * Since the generic VFS calls will not contain any security mount data | |
622 | * we need to skip the double mount verification. | |
623 | * | |
624 | * This does open a hole in which we will not notice if the first | |
625 | * mount using this sb set explict options and a second mount using | |
626 | * this sb does not set any security options. (The first options | |
627 | * will be used for both mounts) | |
628 | */ | |
629 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) | |
630 | && (num_opts == 0)) | |
f5269710 | 631 | goto out; |
e0007529 | 632 | |
c9180a57 EP |
633 | /* |
634 | * parse the mount options, check if they are valid sids. | |
635 | * also check if someone is trying to mount the same sb more | |
636 | * than once with different security options. | |
637 | */ | |
638 | for (i = 0; i < num_opts; i++) { | |
639 | u32 sid; | |
640 | rc = security_context_to_sid(mount_options[i], | |
641 | strlen(mount_options[i]), &sid); | |
1da177e4 LT |
642 | if (rc) { |
643 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
644 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
c9180a57 EP |
645 | mount_options[i], sb->s_id, name, rc); |
646 | goto out; | |
647 | } | |
648 | switch (flags[i]) { | |
649 | case FSCONTEXT_MNT: | |
650 | fscontext_sid = sid; | |
651 | ||
652 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
653 | fscontext_sid)) | |
654 | goto out_double_mount; | |
655 | ||
656 | sbsec->flags |= FSCONTEXT_MNT; | |
657 | break; | |
658 | case CONTEXT_MNT: | |
659 | context_sid = sid; | |
660 | ||
661 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
662 | context_sid)) | |
663 | goto out_double_mount; | |
664 | ||
665 | sbsec->flags |= CONTEXT_MNT; | |
666 | break; | |
667 | case ROOTCONTEXT_MNT: | |
668 | rootcontext_sid = sid; | |
669 | ||
670 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
671 | rootcontext_sid)) | |
672 | goto out_double_mount; | |
673 | ||
674 | sbsec->flags |= ROOTCONTEXT_MNT; | |
675 | ||
676 | break; | |
677 | case DEFCONTEXT_MNT: | |
678 | defcontext_sid = sid; | |
679 | ||
680 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
681 | defcontext_sid)) | |
682 | goto out_double_mount; | |
683 | ||
684 | sbsec->flags |= DEFCONTEXT_MNT; | |
685 | ||
686 | break; | |
687 | default: | |
688 | rc = -EINVAL; | |
689 | goto out; | |
1da177e4 | 690 | } |
c9180a57 EP |
691 | } |
692 | ||
693 | if (sbsec->initialized) { | |
694 | /* previously mounted with options, but not on this attempt? */ | |
695 | if (sbsec->flags && !num_opts) | |
696 | goto out_double_mount; | |
697 | rc = 0; | |
698 | goto out; | |
699 | } | |
700 | ||
089be43e | 701 | if (strcmp(sb->s_type->name, "proc") == 0) |
c9180a57 EP |
702 | sbsec->proc = 1; |
703 | ||
704 | /* Determine the labeling behavior to use for this filesystem type. */ | |
459c19f5 | 705 | rc = security_fs_use(sbsec->proc ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
c9180a57 EP |
706 | if (rc) { |
707 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
089be43e | 708 | __func__, sb->s_type->name, rc); |
c9180a57 EP |
709 | goto out; |
710 | } | |
1da177e4 | 711 | |
c9180a57 EP |
712 | /* sets the context of the superblock for the fs being mounted. */ |
713 | if (fscontext_sid) { | |
275bb41e | 714 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); |
1da177e4 | 715 | if (rc) |
c9180a57 | 716 | goto out; |
1da177e4 | 717 | |
c9180a57 | 718 | sbsec->sid = fscontext_sid; |
c312feb2 EP |
719 | } |
720 | ||
721 | /* | |
722 | * Switch to using mount point labeling behavior. | |
723 | * sets the label used on all file below the mountpoint, and will set | |
724 | * the superblock context if not already set. | |
725 | */ | |
c9180a57 EP |
726 | if (context_sid) { |
727 | if (!fscontext_sid) { | |
275bb41e DH |
728 | rc = may_context_mount_sb_relabel(context_sid, sbsec, |
729 | cred); | |
b04ea3ce | 730 | if (rc) |
c9180a57 EP |
731 | goto out; |
732 | sbsec->sid = context_sid; | |
b04ea3ce | 733 | } else { |
275bb41e DH |
734 | rc = may_context_mount_inode_relabel(context_sid, sbsec, |
735 | cred); | |
b04ea3ce | 736 | if (rc) |
c9180a57 | 737 | goto out; |
b04ea3ce | 738 | } |
c9180a57 EP |
739 | if (!rootcontext_sid) |
740 | rootcontext_sid = context_sid; | |
1da177e4 | 741 | |
c9180a57 | 742 | sbsec->mntpoint_sid = context_sid; |
c312feb2 | 743 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
1da177e4 LT |
744 | } |
745 | ||
c9180a57 | 746 | if (rootcontext_sid) { |
275bb41e DH |
747 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, |
748 | cred); | |
0808925e | 749 | if (rc) |
c9180a57 | 750 | goto out; |
0808925e | 751 | |
c9180a57 EP |
752 | root_isec->sid = rootcontext_sid; |
753 | root_isec->initialized = 1; | |
0808925e EP |
754 | } |
755 | ||
c9180a57 EP |
756 | if (defcontext_sid) { |
757 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
758 | rc = -EINVAL; | |
759 | printk(KERN_WARNING "SELinux: defcontext option is " | |
760 | "invalid for this filesystem type\n"); | |
761 | goto out; | |
1da177e4 LT |
762 | } |
763 | ||
c9180a57 EP |
764 | if (defcontext_sid != sbsec->def_sid) { |
765 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
275bb41e | 766 | sbsec, cred); |
c9180a57 EP |
767 | if (rc) |
768 | goto out; | |
769 | } | |
1da177e4 | 770 | |
c9180a57 | 771 | sbsec->def_sid = defcontext_sid; |
1da177e4 LT |
772 | } |
773 | ||
c9180a57 | 774 | rc = sb_finish_set_opts(sb); |
1da177e4 | 775 | out: |
c9180a57 | 776 | mutex_unlock(&sbsec->lock); |
1da177e4 | 777 | return rc; |
c9180a57 EP |
778 | out_double_mount: |
779 | rc = -EINVAL; | |
780 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
781 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
782 | goto out; | |
1da177e4 LT |
783 | } |
784 | ||
c9180a57 EP |
785 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
786 | struct super_block *newsb) | |
1da177e4 | 787 | { |
c9180a57 EP |
788 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
789 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
1da177e4 | 790 | |
c9180a57 EP |
791 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
792 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
793 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
1da177e4 | 794 | |
0f5e6420 EP |
795 | /* |
796 | * if the parent was able to be mounted it clearly had no special lsm | |
797 | * mount options. thus we can safely put this sb on the list and deal | |
798 | * with it later | |
799 | */ | |
800 | if (!ss_initialized) { | |
801 | spin_lock(&sb_security_lock); | |
802 | if (list_empty(&newsbsec->list)) | |
803 | list_add(&newsbsec->list, &superblock_security_head); | |
804 | spin_unlock(&sb_security_lock); | |
805 | return; | |
806 | } | |
c9180a57 | 807 | |
c9180a57 EP |
808 | /* how can we clone if the old one wasn't set up?? */ |
809 | BUG_ON(!oldsbsec->initialized); | |
810 | ||
5a552617 EP |
811 | /* if fs is reusing a sb, just let its options stand... */ |
812 | if (newsbsec->initialized) | |
813 | return; | |
814 | ||
c9180a57 EP |
815 | mutex_lock(&newsbsec->lock); |
816 | ||
817 | newsbsec->flags = oldsbsec->flags; | |
818 | ||
819 | newsbsec->sid = oldsbsec->sid; | |
820 | newsbsec->def_sid = oldsbsec->def_sid; | |
821 | newsbsec->behavior = oldsbsec->behavior; | |
822 | ||
823 | if (set_context) { | |
824 | u32 sid = oldsbsec->mntpoint_sid; | |
825 | ||
826 | if (!set_fscontext) | |
827 | newsbsec->sid = sid; | |
828 | if (!set_rootcontext) { | |
829 | struct inode *newinode = newsb->s_root->d_inode; | |
830 | struct inode_security_struct *newisec = newinode->i_security; | |
831 | newisec->sid = sid; | |
832 | } | |
833 | newsbsec->mntpoint_sid = sid; | |
1da177e4 | 834 | } |
c9180a57 EP |
835 | if (set_rootcontext) { |
836 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
837 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
838 | struct inode *newinode = newsb->s_root->d_inode; | |
839 | struct inode_security_struct *newisec = newinode->i_security; | |
1da177e4 | 840 | |
c9180a57 | 841 | newisec->sid = oldisec->sid; |
1da177e4 LT |
842 | } |
843 | ||
c9180a57 EP |
844 | sb_finish_set_opts(newsb); |
845 | mutex_unlock(&newsbsec->lock); | |
846 | } | |
847 | ||
2e1479d9 AB |
848 | static int selinux_parse_opts_str(char *options, |
849 | struct security_mnt_opts *opts) | |
c9180a57 | 850 | { |
e0007529 | 851 | char *p; |
c9180a57 EP |
852 | char *context = NULL, *defcontext = NULL; |
853 | char *fscontext = NULL, *rootcontext = NULL; | |
e0007529 | 854 | int rc, num_mnt_opts = 0; |
1da177e4 | 855 | |
e0007529 | 856 | opts->num_mnt_opts = 0; |
1da177e4 | 857 | |
c9180a57 EP |
858 | /* Standard string-based options. */ |
859 | while ((p = strsep(&options, "|")) != NULL) { | |
860 | int token; | |
861 | substring_t args[MAX_OPT_ARGS]; | |
1da177e4 | 862 | |
c9180a57 EP |
863 | if (!*p) |
864 | continue; | |
1da177e4 | 865 | |
c9180a57 | 866 | token = match_token(p, tokens, args); |
1da177e4 | 867 | |
c9180a57 EP |
868 | switch (token) { |
869 | case Opt_context: | |
870 | if (context || defcontext) { | |
871 | rc = -EINVAL; | |
872 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
873 | goto out_err; | |
874 | } | |
875 | context = match_strdup(&args[0]); | |
876 | if (!context) { | |
877 | rc = -ENOMEM; | |
878 | goto out_err; | |
879 | } | |
880 | break; | |
881 | ||
882 | case Opt_fscontext: | |
883 | if (fscontext) { | |
884 | rc = -EINVAL; | |
885 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
886 | goto out_err; | |
887 | } | |
888 | fscontext = match_strdup(&args[0]); | |
889 | if (!fscontext) { | |
890 | rc = -ENOMEM; | |
891 | goto out_err; | |
892 | } | |
893 | break; | |
894 | ||
895 | case Opt_rootcontext: | |
896 | if (rootcontext) { | |
897 | rc = -EINVAL; | |
898 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
899 | goto out_err; | |
900 | } | |
901 | rootcontext = match_strdup(&args[0]); | |
902 | if (!rootcontext) { | |
903 | rc = -ENOMEM; | |
904 | goto out_err; | |
905 | } | |
906 | break; | |
907 | ||
908 | case Opt_defcontext: | |
909 | if (context || defcontext) { | |
910 | rc = -EINVAL; | |
911 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
912 | goto out_err; | |
913 | } | |
914 | defcontext = match_strdup(&args[0]); | |
915 | if (!defcontext) { | |
916 | rc = -ENOMEM; | |
917 | goto out_err; | |
918 | } | |
919 | break; | |
920 | ||
921 | default: | |
922 | rc = -EINVAL; | |
923 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
924 | goto out_err; | |
1da177e4 | 925 | |
1da177e4 | 926 | } |
1da177e4 | 927 | } |
c9180a57 | 928 | |
e0007529 EP |
929 | rc = -ENOMEM; |
930 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
931 | if (!opts->mnt_opts) | |
932 | goto out_err; | |
933 | ||
934 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); | |
935 | if (!opts->mnt_opts_flags) { | |
936 | kfree(opts->mnt_opts); | |
937 | goto out_err; | |
938 | } | |
939 | ||
c9180a57 | 940 | if (fscontext) { |
e0007529 EP |
941 | opts->mnt_opts[num_mnt_opts] = fscontext; |
942 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
c9180a57 EP |
943 | } |
944 | if (context) { | |
e0007529 EP |
945 | opts->mnt_opts[num_mnt_opts] = context; |
946 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
c9180a57 EP |
947 | } |
948 | if (rootcontext) { | |
e0007529 EP |
949 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
950 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
c9180a57 EP |
951 | } |
952 | if (defcontext) { | |
e0007529 EP |
953 | opts->mnt_opts[num_mnt_opts] = defcontext; |
954 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
955 | } |
956 | ||
e0007529 EP |
957 | opts->num_mnt_opts = num_mnt_opts; |
958 | return 0; | |
959 | ||
c9180a57 EP |
960 | out_err: |
961 | kfree(context); | |
962 | kfree(defcontext); | |
963 | kfree(fscontext); | |
964 | kfree(rootcontext); | |
1da177e4 LT |
965 | return rc; |
966 | } | |
e0007529 EP |
967 | /* |
968 | * string mount options parsing and call set the sbsec | |
969 | */ | |
970 | static int superblock_doinit(struct super_block *sb, void *data) | |
971 | { | |
972 | int rc = 0; | |
973 | char *options = data; | |
974 | struct security_mnt_opts opts; | |
975 | ||
976 | security_init_mnt_opts(&opts); | |
977 | ||
978 | if (!data) | |
979 | goto out; | |
980 | ||
981 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); | |
982 | ||
983 | rc = selinux_parse_opts_str(options, &opts); | |
984 | if (rc) | |
985 | goto out_err; | |
986 | ||
987 | out: | |
988 | rc = selinux_set_mnt_opts(sb, &opts); | |
989 | ||
990 | out_err: | |
991 | security_free_mnt_opts(&opts); | |
992 | return rc; | |
993 | } | |
1da177e4 | 994 | |
3583a711 AB |
995 | static void selinux_write_opts(struct seq_file *m, |
996 | struct security_mnt_opts *opts) | |
2069f457 EP |
997 | { |
998 | int i; | |
999 | char *prefix; | |
1000 | ||
1001 | for (i = 0; i < opts->num_mnt_opts; i++) { | |
1002 | char *has_comma = strchr(opts->mnt_opts[i], ','); | |
1003 | ||
1004 | switch (opts->mnt_opts_flags[i]) { | |
1005 | case CONTEXT_MNT: | |
1006 | prefix = CONTEXT_STR; | |
1007 | break; | |
1008 | case FSCONTEXT_MNT: | |
1009 | prefix = FSCONTEXT_STR; | |
1010 | break; | |
1011 | case ROOTCONTEXT_MNT: | |
1012 | prefix = ROOTCONTEXT_STR; | |
1013 | break; | |
1014 | case DEFCONTEXT_MNT: | |
1015 | prefix = DEFCONTEXT_STR; | |
1016 | break; | |
1017 | default: | |
1018 | BUG(); | |
1019 | }; | |
1020 | /* we need a comma before each option */ | |
1021 | seq_putc(m, ','); | |
1022 | seq_puts(m, prefix); | |
1023 | if (has_comma) | |
1024 | seq_putc(m, '\"'); | |
1025 | seq_puts(m, opts->mnt_opts[i]); | |
1026 | if (has_comma) | |
1027 | seq_putc(m, '\"'); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) | |
1032 | { | |
1033 | struct security_mnt_opts opts; | |
1034 | int rc; | |
1035 | ||
1036 | rc = selinux_get_mnt_opts(sb, &opts); | |
383795c2 EP |
1037 | if (rc) { |
1038 | /* before policy load we may get EINVAL, don't show anything */ | |
1039 | if (rc == -EINVAL) | |
1040 | rc = 0; | |
2069f457 | 1041 | return rc; |
383795c2 | 1042 | } |
2069f457 EP |
1043 | |
1044 | selinux_write_opts(m, &opts); | |
1045 | ||
1046 | security_free_mnt_opts(&opts); | |
1047 | ||
1048 | return rc; | |
1049 | } | |
1050 | ||
1da177e4 LT |
1051 | static inline u16 inode_mode_to_security_class(umode_t mode) |
1052 | { | |
1053 | switch (mode & S_IFMT) { | |
1054 | case S_IFSOCK: | |
1055 | return SECCLASS_SOCK_FILE; | |
1056 | case S_IFLNK: | |
1057 | return SECCLASS_LNK_FILE; | |
1058 | case S_IFREG: | |
1059 | return SECCLASS_FILE; | |
1060 | case S_IFBLK: | |
1061 | return SECCLASS_BLK_FILE; | |
1062 | case S_IFDIR: | |
1063 | return SECCLASS_DIR; | |
1064 | case S_IFCHR: | |
1065 | return SECCLASS_CHR_FILE; | |
1066 | case S_IFIFO: | |
1067 | return SECCLASS_FIFO_FILE; | |
1068 | ||
1069 | } | |
1070 | ||
1071 | return SECCLASS_FILE; | |
1072 | } | |
1073 | ||
13402580 JM |
1074 | static inline int default_protocol_stream(int protocol) |
1075 | { | |
1076 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
1077 | } | |
1078 | ||
1079 | static inline int default_protocol_dgram(int protocol) | |
1080 | { | |
1081 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
1082 | } | |
1083 | ||
1da177e4 LT |
1084 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
1085 | { | |
1086 | switch (family) { | |
1087 | case PF_UNIX: | |
1088 | switch (type) { | |
1089 | case SOCK_STREAM: | |
1090 | case SOCK_SEQPACKET: | |
1091 | return SECCLASS_UNIX_STREAM_SOCKET; | |
1092 | case SOCK_DGRAM: | |
1093 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
1094 | } | |
1095 | break; | |
1096 | case PF_INET: | |
1097 | case PF_INET6: | |
1098 | switch (type) { | |
1099 | case SOCK_STREAM: | |
13402580 JM |
1100 | if (default_protocol_stream(protocol)) |
1101 | return SECCLASS_TCP_SOCKET; | |
1102 | else | |
1103 | return SECCLASS_RAWIP_SOCKET; | |
1da177e4 | 1104 | case SOCK_DGRAM: |
13402580 JM |
1105 | if (default_protocol_dgram(protocol)) |
1106 | return SECCLASS_UDP_SOCKET; | |
1107 | else | |
1108 | return SECCLASS_RAWIP_SOCKET; | |
2ee92d46 JM |
1109 | case SOCK_DCCP: |
1110 | return SECCLASS_DCCP_SOCKET; | |
13402580 | 1111 | default: |
1da177e4 LT |
1112 | return SECCLASS_RAWIP_SOCKET; |
1113 | } | |
1114 | break; | |
1115 | case PF_NETLINK: | |
1116 | switch (protocol) { | |
1117 | case NETLINK_ROUTE: | |
1118 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1119 | case NETLINK_FIREWALL: | |
1120 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
216efaaa | 1121 | case NETLINK_INET_DIAG: |
1da177e4 LT |
1122 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
1123 | case NETLINK_NFLOG: | |
1124 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1125 | case NETLINK_XFRM: | |
1126 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1127 | case NETLINK_SELINUX: | |
1128 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1129 | case NETLINK_AUDIT: | |
1130 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1131 | case NETLINK_IP6_FW: | |
1132 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1133 | case NETLINK_DNRTMSG: | |
1134 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
0c9b7942 JM |
1135 | case NETLINK_KOBJECT_UEVENT: |
1136 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1da177e4 LT |
1137 | default: |
1138 | return SECCLASS_NETLINK_SOCKET; | |
1139 | } | |
1140 | case PF_PACKET: | |
1141 | return SECCLASS_PACKET_SOCKET; | |
1142 | case PF_KEY: | |
1143 | return SECCLASS_KEY_SOCKET; | |
3e3ff15e CP |
1144 | case PF_APPLETALK: |
1145 | return SECCLASS_APPLETALK_SOCKET; | |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | return SECCLASS_SOCKET; | |
1149 | } | |
1150 | ||
1151 | #ifdef CONFIG_PROC_FS | |
1152 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1153 | u16 tclass, | |
1154 | u32 *sid) | |
1155 | { | |
1156 | int buflen, rc; | |
1157 | char *buffer, *path, *end; | |
1158 | ||
828dfe1d | 1159 | buffer = (char *)__get_free_page(GFP_KERNEL); |
1da177e4 LT |
1160 | if (!buffer) |
1161 | return -ENOMEM; | |
1162 | ||
1163 | buflen = PAGE_SIZE; | |
1164 | end = buffer+buflen; | |
1165 | *--end = '\0'; | |
1166 | buflen--; | |
1167 | path = end-1; | |
1168 | *path = '/'; | |
1169 | while (de && de != de->parent) { | |
1170 | buflen -= de->namelen + 1; | |
1171 | if (buflen < 0) | |
1172 | break; | |
1173 | end -= de->namelen; | |
1174 | memcpy(end, de->name, de->namelen); | |
1175 | *--end = '/'; | |
1176 | path = end; | |
1177 | de = de->parent; | |
1178 | } | |
1179 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1180 | free_page((unsigned long)buffer); | |
1181 | return rc; | |
1182 | } | |
1183 | #else | |
1184 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1185 | u16 tclass, | |
1186 | u32 *sid) | |
1187 | { | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | #endif | |
1191 | ||
1192 | /* The inode's security attributes must be initialized before first use. */ | |
1193 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1194 | { | |
1195 | struct superblock_security_struct *sbsec = NULL; | |
1196 | struct inode_security_struct *isec = inode->i_security; | |
1197 | u32 sid; | |
1198 | struct dentry *dentry; | |
1199 | #define INITCONTEXTLEN 255 | |
1200 | char *context = NULL; | |
1201 | unsigned len = 0; | |
1202 | int rc = 0; | |
1da177e4 LT |
1203 | |
1204 | if (isec->initialized) | |
1205 | goto out; | |
1206 | ||
23970741 | 1207 | mutex_lock(&isec->lock); |
1da177e4 | 1208 | if (isec->initialized) |
23970741 | 1209 | goto out_unlock; |
1da177e4 LT |
1210 | |
1211 | sbsec = inode->i_sb->s_security; | |
1212 | if (!sbsec->initialized) { | |
1213 | /* Defer initialization until selinux_complete_init, | |
1214 | after the initial policy is loaded and the security | |
1215 | server is ready to handle calls. */ | |
1216 | spin_lock(&sbsec->isec_lock); | |
1217 | if (list_empty(&isec->list)) | |
1218 | list_add(&isec->list, &sbsec->isec_head); | |
1219 | spin_unlock(&sbsec->isec_lock); | |
23970741 | 1220 | goto out_unlock; |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | switch (sbsec->behavior) { | |
1224 | case SECURITY_FS_USE_XATTR: | |
1225 | if (!inode->i_op->getxattr) { | |
1226 | isec->sid = sbsec->def_sid; | |
1227 | break; | |
1228 | } | |
1229 | ||
1230 | /* Need a dentry, since the xattr API requires one. | |
1231 | Life would be simpler if we could just pass the inode. */ | |
1232 | if (opt_dentry) { | |
1233 | /* Called from d_instantiate or d_splice_alias. */ | |
1234 | dentry = dget(opt_dentry); | |
1235 | } else { | |
1236 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1237 | dentry = d_find_alias(inode); | |
1238 | } | |
1239 | if (!dentry) { | |
744ba35e | 1240 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
dd6f953a | 1241 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
1da177e4 | 1242 | inode->i_ino); |
23970741 | 1243 | goto out_unlock; |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | len = INITCONTEXTLEN; | |
869ab514 | 1247 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1248 | if (!context) { |
1249 | rc = -ENOMEM; | |
1250 | dput(dentry); | |
23970741 | 1251 | goto out_unlock; |
1da177e4 LT |
1252 | } |
1253 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1254 | context, len); | |
1255 | if (rc == -ERANGE) { | |
1256 | /* Need a larger buffer. Query for the right size. */ | |
1257 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1258 | NULL, 0); | |
1259 | if (rc < 0) { | |
1260 | dput(dentry); | |
23970741 | 1261 | goto out_unlock; |
1da177e4 LT |
1262 | } |
1263 | kfree(context); | |
1264 | len = rc; | |
869ab514 | 1265 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1266 | if (!context) { |
1267 | rc = -ENOMEM; | |
1268 | dput(dentry); | |
23970741 | 1269 | goto out_unlock; |
1da177e4 LT |
1270 | } |
1271 | rc = inode->i_op->getxattr(dentry, | |
1272 | XATTR_NAME_SELINUX, | |
1273 | context, len); | |
1274 | } | |
1275 | dput(dentry); | |
1276 | if (rc < 0) { | |
1277 | if (rc != -ENODATA) { | |
744ba35e | 1278 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
dd6f953a | 1279 | "%d for dev=%s ino=%ld\n", __func__, |
1da177e4 LT |
1280 | -rc, inode->i_sb->s_id, inode->i_ino); |
1281 | kfree(context); | |
23970741 | 1282 | goto out_unlock; |
1da177e4 LT |
1283 | } |
1284 | /* Map ENODATA to the default file SID */ | |
1285 | sid = sbsec->def_sid; | |
1286 | rc = 0; | |
1287 | } else { | |
f5c1d5b2 | 1288 | rc = security_context_to_sid_default(context, rc, &sid, |
869ab514 SS |
1289 | sbsec->def_sid, |
1290 | GFP_NOFS); | |
1da177e4 | 1291 | if (rc) { |
744ba35e | 1292 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
1da177e4 | 1293 | "returned %d for dev=%s ino=%ld\n", |
dd6f953a | 1294 | __func__, context, -rc, |
1da177e4 LT |
1295 | inode->i_sb->s_id, inode->i_ino); |
1296 | kfree(context); | |
1297 | /* Leave with the unlabeled SID */ | |
1298 | rc = 0; | |
1299 | break; | |
1300 | } | |
1301 | } | |
1302 | kfree(context); | |
1303 | isec->sid = sid; | |
1304 | break; | |
1305 | case SECURITY_FS_USE_TASK: | |
1306 | isec->sid = isec->task_sid; | |
1307 | break; | |
1308 | case SECURITY_FS_USE_TRANS: | |
1309 | /* Default to the fs SID. */ | |
1310 | isec->sid = sbsec->sid; | |
1311 | ||
1312 | /* Try to obtain a transition SID. */ | |
1313 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1314 | rc = security_transition_sid(isec->task_sid, | |
1315 | sbsec->sid, | |
1316 | isec->sclass, | |
1317 | &sid); | |
1318 | if (rc) | |
23970741 | 1319 | goto out_unlock; |
1da177e4 LT |
1320 | isec->sid = sid; |
1321 | break; | |
c312feb2 EP |
1322 | case SECURITY_FS_USE_MNTPOINT: |
1323 | isec->sid = sbsec->mntpoint_sid; | |
1324 | break; | |
1da177e4 | 1325 | default: |
c312feb2 | 1326 | /* Default to the fs superblock SID. */ |
1da177e4 LT |
1327 | isec->sid = sbsec->sid; |
1328 | ||
ea6b184f | 1329 | if (sbsec->proc && !S_ISLNK(inode->i_mode)) { |
1da177e4 LT |
1330 | struct proc_inode *proci = PROC_I(inode); |
1331 | if (proci->pde) { | |
1332 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1333 | rc = selinux_proc_get_sid(proci->pde, | |
1334 | isec->sclass, | |
1335 | &sid); | |
1336 | if (rc) | |
23970741 | 1337 | goto out_unlock; |
1da177e4 LT |
1338 | isec->sid = sid; |
1339 | } | |
1340 | } | |
1341 | break; | |
1342 | } | |
1343 | ||
1344 | isec->initialized = 1; | |
1345 | ||
23970741 EP |
1346 | out_unlock: |
1347 | mutex_unlock(&isec->lock); | |
1da177e4 LT |
1348 | out: |
1349 | if (isec->sclass == SECCLASS_FILE) | |
1350 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1da177e4 LT |
1351 | return rc; |
1352 | } | |
1353 | ||
1354 | /* Convert a Linux signal to an access vector. */ | |
1355 | static inline u32 signal_to_av(int sig) | |
1356 | { | |
1357 | u32 perm = 0; | |
1358 | ||
1359 | switch (sig) { | |
1360 | case SIGCHLD: | |
1361 | /* Commonly granted from child to parent. */ | |
1362 | perm = PROCESS__SIGCHLD; | |
1363 | break; | |
1364 | case SIGKILL: | |
1365 | /* Cannot be caught or ignored */ | |
1366 | perm = PROCESS__SIGKILL; | |
1367 | break; | |
1368 | case SIGSTOP: | |
1369 | /* Cannot be caught or ignored */ | |
1370 | perm = PROCESS__SIGSTOP; | |
1371 | break; | |
1372 | default: | |
1373 | /* All other signals. */ | |
1374 | perm = PROCESS__SIGNAL; | |
1375 | break; | |
1376 | } | |
1377 | ||
1378 | return perm; | |
1379 | } | |
1380 | ||
d84f4f99 DH |
1381 | /* |
1382 | * Check permission between a pair of credentials | |
1383 | * fork check, ptrace check, etc. | |
1384 | */ | |
1385 | static int cred_has_perm(const struct cred *actor, | |
1386 | const struct cred *target, | |
1387 | u32 perms) | |
1388 | { | |
1389 | u32 asid = cred_sid(actor), tsid = cred_sid(target); | |
1390 | ||
1391 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); | |
1392 | } | |
1393 | ||
275bb41e | 1394 | /* |
88e67f3b | 1395 | * Check permission between a pair of tasks, e.g. signal checks, |
275bb41e DH |
1396 | * fork check, ptrace check, etc. |
1397 | * tsk1 is the actor and tsk2 is the target | |
3b11a1de | 1398 | * - this uses the default subjective creds of tsk1 |
275bb41e DH |
1399 | */ |
1400 | static int task_has_perm(const struct task_struct *tsk1, | |
1401 | const struct task_struct *tsk2, | |
1da177e4 LT |
1402 | u32 perms) |
1403 | { | |
275bb41e DH |
1404 | const struct task_security_struct *__tsec1, *__tsec2; |
1405 | u32 sid1, sid2; | |
1da177e4 | 1406 | |
275bb41e DH |
1407 | rcu_read_lock(); |
1408 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; | |
1409 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; | |
1410 | rcu_read_unlock(); | |
1411 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); | |
1da177e4 LT |
1412 | } |
1413 | ||
3b11a1de DH |
1414 | /* |
1415 | * Check permission between current and another task, e.g. signal checks, | |
1416 | * fork check, ptrace check, etc. | |
1417 | * current is the actor and tsk2 is the target | |
1418 | * - this uses current's subjective creds | |
1419 | */ | |
1420 | static int current_has_perm(const struct task_struct *tsk, | |
1421 | u32 perms) | |
1422 | { | |
1423 | u32 sid, tsid; | |
1424 | ||
1425 | sid = current_sid(); | |
1426 | tsid = task_sid(tsk); | |
1427 | return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); | |
1428 | } | |
1429 | ||
b68e418c SS |
1430 | #if CAP_LAST_CAP > 63 |
1431 | #error Fix SELinux to handle capabilities > 63. | |
1432 | #endif | |
1433 | ||
1da177e4 LT |
1434 | /* Check whether a task is allowed to use a capability. */ |
1435 | static int task_has_capability(struct task_struct *tsk, | |
3699c53c | 1436 | const struct cred *cred, |
06112163 | 1437 | int cap, int audit) |
1da177e4 | 1438 | { |
1da177e4 | 1439 | struct avc_audit_data ad; |
06112163 | 1440 | struct av_decision avd; |
b68e418c | 1441 | u16 sclass; |
3699c53c | 1442 | u32 sid = cred_sid(cred); |
b68e418c | 1443 | u32 av = CAP_TO_MASK(cap); |
06112163 | 1444 | int rc; |
1da177e4 | 1445 | |
828dfe1d | 1446 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
1da177e4 LT |
1447 | ad.tsk = tsk; |
1448 | ad.u.cap = cap; | |
1449 | ||
b68e418c SS |
1450 | switch (CAP_TO_INDEX(cap)) { |
1451 | case 0: | |
1452 | sclass = SECCLASS_CAPABILITY; | |
1453 | break; | |
1454 | case 1: | |
1455 | sclass = SECCLASS_CAPABILITY2; | |
1456 | break; | |
1457 | default: | |
1458 | printk(KERN_ERR | |
1459 | "SELinux: out of range capability %d\n", cap); | |
1460 | BUG(); | |
1461 | } | |
06112163 | 1462 | |
275bb41e | 1463 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); |
06112163 | 1464 | if (audit == SECURITY_CAP_AUDIT) |
275bb41e | 1465 | avc_audit(sid, sid, sclass, av, &avd, rc, &ad); |
06112163 | 1466 | return rc; |
1da177e4 LT |
1467 | } |
1468 | ||
1469 | /* Check whether a task is allowed to use a system operation. */ | |
1470 | static int task_has_system(struct task_struct *tsk, | |
1471 | u32 perms) | |
1472 | { | |
275bb41e | 1473 | u32 sid = task_sid(tsk); |
1da177e4 | 1474 | |
275bb41e | 1475 | return avc_has_perm(sid, SECINITSID_KERNEL, |
1da177e4 LT |
1476 | SECCLASS_SYSTEM, perms, NULL); |
1477 | } | |
1478 | ||
1479 | /* Check whether a task has a particular permission to an inode. | |
1480 | The 'adp' parameter is optional and allows other audit | |
1481 | data to be passed (e.g. the dentry). */ | |
88e67f3b | 1482 | static int inode_has_perm(const struct cred *cred, |
1da177e4 LT |
1483 | struct inode *inode, |
1484 | u32 perms, | |
1485 | struct avc_audit_data *adp) | |
1486 | { | |
1da177e4 LT |
1487 | struct inode_security_struct *isec; |
1488 | struct avc_audit_data ad; | |
275bb41e | 1489 | u32 sid; |
1da177e4 | 1490 | |
828dfe1d | 1491 | if (unlikely(IS_PRIVATE(inode))) |
bbaca6c2 SS |
1492 | return 0; |
1493 | ||
88e67f3b | 1494 | sid = cred_sid(cred); |
1da177e4 LT |
1495 | isec = inode->i_security; |
1496 | ||
1497 | if (!adp) { | |
1498 | adp = &ad; | |
1499 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1500 | ad.u.fs.inode = inode; | |
1501 | } | |
1502 | ||
275bb41e | 1503 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); |
1da177e4 LT |
1504 | } |
1505 | ||
1506 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1507 | the dentry to help the auditing code to more easily generate the | |
1508 | pathname if needed. */ | |
88e67f3b | 1509 | static inline int dentry_has_perm(const struct cred *cred, |
1da177e4 LT |
1510 | struct vfsmount *mnt, |
1511 | struct dentry *dentry, | |
1512 | u32 av) | |
1513 | { | |
1514 | struct inode *inode = dentry->d_inode; | |
1515 | struct avc_audit_data ad; | |
88e67f3b | 1516 | |
828dfe1d | 1517 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf JB |
1518 | ad.u.fs.path.mnt = mnt; |
1519 | ad.u.fs.path.dentry = dentry; | |
88e67f3b | 1520 | return inode_has_perm(cred, inode, av, &ad); |
1da177e4 LT |
1521 | } |
1522 | ||
1523 | /* Check whether a task can use an open file descriptor to | |
1524 | access an inode in a given way. Check access to the | |
1525 | descriptor itself, and then use dentry_has_perm to | |
1526 | check a particular permission to the file. | |
1527 | Access to the descriptor is implicitly granted if it | |
1528 | has the same SID as the process. If av is zero, then | |
1529 | access to the file is not checked, e.g. for cases | |
1530 | where only the descriptor is affected like seek. */ | |
88e67f3b DH |
1531 | static int file_has_perm(const struct cred *cred, |
1532 | struct file *file, | |
1533 | u32 av) | |
1da177e4 | 1534 | { |
1da177e4 | 1535 | struct file_security_struct *fsec = file->f_security; |
44707fdf | 1536 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 | 1537 | struct avc_audit_data ad; |
88e67f3b | 1538 | u32 sid = cred_sid(cred); |
1da177e4 LT |
1539 | int rc; |
1540 | ||
1541 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1542 | ad.u.fs.path = file->f_path; |
1da177e4 | 1543 | |
275bb41e DH |
1544 | if (sid != fsec->sid) { |
1545 | rc = avc_has_perm(sid, fsec->sid, | |
1da177e4 LT |
1546 | SECCLASS_FD, |
1547 | FD__USE, | |
1548 | &ad); | |
1549 | if (rc) | |
88e67f3b | 1550 | goto out; |
1da177e4 LT |
1551 | } |
1552 | ||
1553 | /* av is zero if only checking access to the descriptor. */ | |
88e67f3b | 1554 | rc = 0; |
1da177e4 | 1555 | if (av) |
88e67f3b | 1556 | rc = inode_has_perm(cred, inode, av, &ad); |
1da177e4 | 1557 | |
88e67f3b DH |
1558 | out: |
1559 | return rc; | |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | /* Check whether a task can create a file. */ | |
1563 | static int may_create(struct inode *dir, | |
1564 | struct dentry *dentry, | |
1565 | u16 tclass) | |
1566 | { | |
275bb41e DH |
1567 | const struct cred *cred = current_cred(); |
1568 | const struct task_security_struct *tsec = cred->security; | |
1da177e4 LT |
1569 | struct inode_security_struct *dsec; |
1570 | struct superblock_security_struct *sbsec; | |
275bb41e | 1571 | u32 sid, newsid; |
1da177e4 LT |
1572 | struct avc_audit_data ad; |
1573 | int rc; | |
1574 | ||
1da177e4 LT |
1575 | dsec = dir->i_security; |
1576 | sbsec = dir->i_sb->s_security; | |
1577 | ||
275bb41e DH |
1578 | sid = tsec->sid; |
1579 | newsid = tsec->create_sid; | |
1580 | ||
1da177e4 | 1581 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 1582 | ad.u.fs.path.dentry = dentry; |
1da177e4 | 1583 | |
275bb41e | 1584 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, |
1da177e4 LT |
1585 | DIR__ADD_NAME | DIR__SEARCH, |
1586 | &ad); | |
1587 | if (rc) | |
1588 | return rc; | |
1589 | ||
275bb41e DH |
1590 | if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) { |
1591 | rc = security_transition_sid(sid, dsec->sid, tclass, &newsid); | |
1da177e4 LT |
1592 | if (rc) |
1593 | return rc; | |
1594 | } | |
1595 | ||
275bb41e | 1596 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); |
1da177e4 LT |
1597 | if (rc) |
1598 | return rc; | |
1599 | ||
1600 | return avc_has_perm(newsid, sbsec->sid, | |
1601 | SECCLASS_FILESYSTEM, | |
1602 | FILESYSTEM__ASSOCIATE, &ad); | |
1603 | } | |
1604 | ||
4eb582cf ML |
1605 | /* Check whether a task can create a key. */ |
1606 | static int may_create_key(u32 ksid, | |
1607 | struct task_struct *ctx) | |
1608 | { | |
275bb41e | 1609 | u32 sid = task_sid(ctx); |
4eb582cf | 1610 | |
275bb41e | 1611 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
4eb582cf ML |
1612 | } |
1613 | ||
828dfe1d EP |
1614 | #define MAY_LINK 0 |
1615 | #define MAY_UNLINK 1 | |
1616 | #define MAY_RMDIR 2 | |
1da177e4 LT |
1617 | |
1618 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1619 | static int may_link(struct inode *dir, | |
1620 | struct dentry *dentry, | |
1621 | int kind) | |
1622 | ||
1623 | { | |
1da177e4 LT |
1624 | struct inode_security_struct *dsec, *isec; |
1625 | struct avc_audit_data ad; | |
275bb41e | 1626 | u32 sid = current_sid(); |
1da177e4 LT |
1627 | u32 av; |
1628 | int rc; | |
1629 | ||
1da177e4 LT |
1630 | dsec = dir->i_security; |
1631 | isec = dentry->d_inode->i_security; | |
1632 | ||
1633 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1634 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1635 | |
1636 | av = DIR__SEARCH; | |
1637 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
275bb41e | 1638 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); |
1da177e4 LT |
1639 | if (rc) |
1640 | return rc; | |
1641 | ||
1642 | switch (kind) { | |
1643 | case MAY_LINK: | |
1644 | av = FILE__LINK; | |
1645 | break; | |
1646 | case MAY_UNLINK: | |
1647 | av = FILE__UNLINK; | |
1648 | break; | |
1649 | case MAY_RMDIR: | |
1650 | av = DIR__RMDIR; | |
1651 | break; | |
1652 | default: | |
744ba35e EP |
1653 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
1654 | __func__, kind); | |
1da177e4 LT |
1655 | return 0; |
1656 | } | |
1657 | ||
275bb41e | 1658 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); |
1da177e4 LT |
1659 | return rc; |
1660 | } | |
1661 | ||
1662 | static inline int may_rename(struct inode *old_dir, | |
1663 | struct dentry *old_dentry, | |
1664 | struct inode *new_dir, | |
1665 | struct dentry *new_dentry) | |
1666 | { | |
1da177e4 LT |
1667 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
1668 | struct avc_audit_data ad; | |
275bb41e | 1669 | u32 sid = current_sid(); |
1da177e4 LT |
1670 | u32 av; |
1671 | int old_is_dir, new_is_dir; | |
1672 | int rc; | |
1673 | ||
1da177e4 LT |
1674 | old_dsec = old_dir->i_security; |
1675 | old_isec = old_dentry->d_inode->i_security; | |
1676 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1677 | new_dsec = new_dir->i_security; | |
1678 | ||
1679 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1680 | ||
44707fdf | 1681 | ad.u.fs.path.dentry = old_dentry; |
275bb41e | 1682 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, |
1da177e4 LT |
1683 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
1684 | if (rc) | |
1685 | return rc; | |
275bb41e | 1686 | rc = avc_has_perm(sid, old_isec->sid, |
1da177e4 LT |
1687 | old_isec->sclass, FILE__RENAME, &ad); |
1688 | if (rc) | |
1689 | return rc; | |
1690 | if (old_is_dir && new_dir != old_dir) { | |
275bb41e | 1691 | rc = avc_has_perm(sid, old_isec->sid, |
1da177e4 LT |
1692 | old_isec->sclass, DIR__REPARENT, &ad); |
1693 | if (rc) | |
1694 | return rc; | |
1695 | } | |
1696 | ||
44707fdf | 1697 | ad.u.fs.path.dentry = new_dentry; |
1da177e4 LT |
1698 | av = DIR__ADD_NAME | DIR__SEARCH; |
1699 | if (new_dentry->d_inode) | |
1700 | av |= DIR__REMOVE_NAME; | |
275bb41e | 1701 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
1da177e4 LT |
1702 | if (rc) |
1703 | return rc; | |
1704 | if (new_dentry->d_inode) { | |
1705 | new_isec = new_dentry->d_inode->i_security; | |
1706 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
275bb41e | 1707 | rc = avc_has_perm(sid, new_isec->sid, |
1da177e4 LT |
1708 | new_isec->sclass, |
1709 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1710 | if (rc) | |
1711 | return rc; | |
1712 | } | |
1713 | ||
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | /* Check whether a task can perform a filesystem operation. */ | |
88e67f3b | 1718 | static int superblock_has_perm(const struct cred *cred, |
1da177e4 LT |
1719 | struct super_block *sb, |
1720 | u32 perms, | |
1721 | struct avc_audit_data *ad) | |
1722 | { | |
1da177e4 | 1723 | struct superblock_security_struct *sbsec; |
88e67f3b | 1724 | u32 sid = cred_sid(cred); |
1da177e4 | 1725 | |
1da177e4 | 1726 | sbsec = sb->s_security; |
275bb41e | 1727 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); |
1da177e4 LT |
1728 | } |
1729 | ||
1730 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1731 | static inline u32 file_mask_to_av(int mode, int mask) | |
1732 | { | |
1733 | u32 av = 0; | |
1734 | ||
1735 | if ((mode & S_IFMT) != S_IFDIR) { | |
1736 | if (mask & MAY_EXEC) | |
1737 | av |= FILE__EXECUTE; | |
1738 | if (mask & MAY_READ) | |
1739 | av |= FILE__READ; | |
1740 | ||
1741 | if (mask & MAY_APPEND) | |
1742 | av |= FILE__APPEND; | |
1743 | else if (mask & MAY_WRITE) | |
1744 | av |= FILE__WRITE; | |
1745 | ||
1746 | } else { | |
1747 | if (mask & MAY_EXEC) | |
1748 | av |= DIR__SEARCH; | |
1749 | if (mask & MAY_WRITE) | |
1750 | av |= DIR__WRITE; | |
1751 | if (mask & MAY_READ) | |
1752 | av |= DIR__READ; | |
1753 | } | |
1754 | ||
1755 | return av; | |
1756 | } | |
1757 | ||
8b6a5a37 EP |
1758 | /* Convert a Linux file to an access vector. */ |
1759 | static inline u32 file_to_av(struct file *file) | |
1760 | { | |
1761 | u32 av = 0; | |
1762 | ||
1763 | if (file->f_mode & FMODE_READ) | |
1764 | av |= FILE__READ; | |
1765 | if (file->f_mode & FMODE_WRITE) { | |
1766 | if (file->f_flags & O_APPEND) | |
1767 | av |= FILE__APPEND; | |
1768 | else | |
1769 | av |= FILE__WRITE; | |
1770 | } | |
1771 | if (!av) { | |
1772 | /* | |
1773 | * Special file opened with flags 3 for ioctl-only use. | |
1774 | */ | |
1775 | av = FILE__IOCTL; | |
1776 | } | |
1777 | ||
1778 | return av; | |
1779 | } | |
1780 | ||
b0c636b9 | 1781 | /* |
8b6a5a37 | 1782 | * Convert a file to an access vector and include the correct open |
b0c636b9 EP |
1783 | * open permission. |
1784 | */ | |
8b6a5a37 | 1785 | static inline u32 open_file_to_av(struct file *file) |
b0c636b9 | 1786 | { |
8b6a5a37 | 1787 | u32 av = file_to_av(file); |
b0c636b9 EP |
1788 | |
1789 | if (selinux_policycap_openperm) { | |
8b6a5a37 | 1790 | mode_t mode = file->f_path.dentry->d_inode->i_mode; |
b0c636b9 EP |
1791 | /* |
1792 | * lnk files and socks do not really have an 'open' | |
1793 | */ | |
1794 | if (S_ISREG(mode)) | |
1795 | av |= FILE__OPEN; | |
1796 | else if (S_ISCHR(mode)) | |
1797 | av |= CHR_FILE__OPEN; | |
1798 | else if (S_ISBLK(mode)) | |
1799 | av |= BLK_FILE__OPEN; | |
1800 | else if (S_ISFIFO(mode)) | |
1801 | av |= FIFO_FILE__OPEN; | |
1802 | else if (S_ISDIR(mode)) | |
1803 | av |= DIR__OPEN; | |
1804 | else | |
744ba35e | 1805 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
8b6a5a37 | 1806 | "unknown mode:%o\n", __func__, mode); |
b0c636b9 EP |
1807 | } |
1808 | return av; | |
1809 | } | |
1810 | ||
1da177e4 LT |
1811 | /* Hook functions begin here. */ |
1812 | ||
5cd9c58f DH |
1813 | static int selinux_ptrace_may_access(struct task_struct *child, |
1814 | unsigned int mode) | |
1da177e4 | 1815 | { |
1da177e4 LT |
1816 | int rc; |
1817 | ||
5cd9c58f | 1818 | rc = secondary_ops->ptrace_may_access(child, mode); |
1da177e4 LT |
1819 | if (rc) |
1820 | return rc; | |
1821 | ||
006ebb40 | 1822 | if (mode == PTRACE_MODE_READ) { |
275bb41e DH |
1823 | u32 sid = current_sid(); |
1824 | u32 csid = task_sid(child); | |
1825 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); | |
006ebb40 SS |
1826 | } |
1827 | ||
3b11a1de | 1828 | return current_has_perm(child, PROCESS__PTRACE); |
5cd9c58f DH |
1829 | } |
1830 | ||
1831 | static int selinux_ptrace_traceme(struct task_struct *parent) | |
1832 | { | |
1833 | int rc; | |
1834 | ||
1835 | rc = secondary_ops->ptrace_traceme(parent); | |
1836 | if (rc) | |
1837 | return rc; | |
1838 | ||
1839 | return task_has_perm(parent, current, PROCESS__PTRACE); | |
1da177e4 LT |
1840 | } |
1841 | ||
1842 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1843 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1844 | { |
1845 | int error; | |
1846 | ||
3b11a1de | 1847 | error = current_has_perm(target, PROCESS__GETCAP); |
1da177e4 LT |
1848 | if (error) |
1849 | return error; | |
1850 | ||
1851 | return secondary_ops->capget(target, effective, inheritable, permitted); | |
1852 | } | |
1853 | ||
d84f4f99 DH |
1854 | static int selinux_capset(struct cred *new, const struct cred *old, |
1855 | const kernel_cap_t *effective, | |
1856 | const kernel_cap_t *inheritable, | |
1857 | const kernel_cap_t *permitted) | |
1da177e4 LT |
1858 | { |
1859 | int error; | |
1860 | ||
d84f4f99 DH |
1861 | error = secondary_ops->capset(new, old, |
1862 | effective, inheritable, permitted); | |
1da177e4 LT |
1863 | if (error) |
1864 | return error; | |
1865 | ||
d84f4f99 | 1866 | return cred_has_perm(old, new, PROCESS__SETCAP); |
1da177e4 LT |
1867 | } |
1868 | ||
3699c53c DH |
1869 | static int selinux_capable(struct task_struct *tsk, const struct cred *cred, |
1870 | int cap, int audit) | |
1da177e4 LT |
1871 | { |
1872 | int rc; | |
1873 | ||
3699c53c | 1874 | rc = secondary_ops->capable(tsk, cred, cap, audit); |
1da177e4 LT |
1875 | if (rc) |
1876 | return rc; | |
1877 | ||
3699c53c | 1878 | return task_has_capability(tsk, cred, cap, audit); |
1da177e4 LT |
1879 | } |
1880 | ||
3fbfa981 EB |
1881 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
1882 | { | |
1883 | int buflen, rc; | |
1884 | char *buffer, *path, *end; | |
1885 | ||
1886 | rc = -ENOMEM; | |
828dfe1d | 1887 | buffer = (char *)__get_free_page(GFP_KERNEL); |
3fbfa981 EB |
1888 | if (!buffer) |
1889 | goto out; | |
1890 | ||
1891 | buflen = PAGE_SIZE; | |
1892 | end = buffer+buflen; | |
1893 | *--end = '\0'; | |
1894 | buflen--; | |
1895 | path = end-1; | |
1896 | *path = '/'; | |
1897 | while (table) { | |
1898 | const char *name = table->procname; | |
1899 | size_t namelen = strlen(name); | |
1900 | buflen -= namelen + 1; | |
1901 | if (buflen < 0) | |
1902 | goto out_free; | |
1903 | end -= namelen; | |
1904 | memcpy(end, name, namelen); | |
1905 | *--end = '/'; | |
1906 | path = end; | |
1907 | table = table->parent; | |
1908 | } | |
b599fdfd EB |
1909 | buflen -= 4; |
1910 | if (buflen < 0) | |
1911 | goto out_free; | |
1912 | end -= 4; | |
1913 | memcpy(end, "/sys", 4); | |
1914 | path = end; | |
3fbfa981 EB |
1915 | rc = security_genfs_sid("proc", path, tclass, sid); |
1916 | out_free: | |
1917 | free_page((unsigned long)buffer); | |
1918 | out: | |
1919 | return rc; | |
1920 | } | |
1921 | ||
1da177e4 LT |
1922 | static int selinux_sysctl(ctl_table *table, int op) |
1923 | { | |
1924 | int error = 0; | |
1925 | u32 av; | |
275bb41e | 1926 | u32 tsid, sid; |
1da177e4 LT |
1927 | int rc; |
1928 | ||
1929 | rc = secondary_ops->sysctl(table, op); | |
1930 | if (rc) | |
1931 | return rc; | |
1932 | ||
275bb41e | 1933 | sid = current_sid(); |
1da177e4 | 1934 | |
3fbfa981 EB |
1935 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
1936 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1da177e4 LT |
1937 | if (rc) { |
1938 | /* Default to the well-defined sysctl SID. */ | |
1939 | tsid = SECINITSID_SYSCTL; | |
1940 | } | |
1941 | ||
1942 | /* The op values are "defined" in sysctl.c, thereby creating | |
1943 | * a bad coupling between this module and sysctl.c */ | |
828dfe1d | 1944 | if (op == 001) { |
275bb41e | 1945 | error = avc_has_perm(sid, tsid, |
1da177e4 LT |
1946 | SECCLASS_DIR, DIR__SEARCH, NULL); |
1947 | } else { | |
1948 | av = 0; | |
1949 | if (op & 004) | |
1950 | av |= FILE__READ; | |
1951 | if (op & 002) | |
1952 | av |= FILE__WRITE; | |
1953 | if (av) | |
275bb41e | 1954 | error = avc_has_perm(sid, tsid, |
1da177e4 | 1955 | SECCLASS_FILE, av, NULL); |
828dfe1d | 1956 | } |
1da177e4 LT |
1957 | |
1958 | return error; | |
1959 | } | |
1960 | ||
1961 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1962 | { | |
88e67f3b | 1963 | const struct cred *cred = current_cred(); |
1da177e4 LT |
1964 | int rc = 0; |
1965 | ||
1966 | if (!sb) | |
1967 | return 0; | |
1968 | ||
1969 | switch (cmds) { | |
828dfe1d EP |
1970 | case Q_SYNC: |
1971 | case Q_QUOTAON: | |
1972 | case Q_QUOTAOFF: | |
1973 | case Q_SETINFO: | |
1974 | case Q_SETQUOTA: | |
88e67f3b | 1975 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); |
828dfe1d EP |
1976 | break; |
1977 | case Q_GETFMT: | |
1978 | case Q_GETINFO: | |
1979 | case Q_GETQUOTA: | |
88e67f3b | 1980 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); |
828dfe1d EP |
1981 | break; |
1982 | default: | |
1983 | rc = 0; /* let the kernel handle invalid cmds */ | |
1984 | break; | |
1da177e4 LT |
1985 | } |
1986 | return rc; | |
1987 | } | |
1988 | ||
1989 | static int selinux_quota_on(struct dentry *dentry) | |
1990 | { | |
88e67f3b DH |
1991 | const struct cred *cred = current_cred(); |
1992 | ||
1993 | return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON); | |
1da177e4 LT |
1994 | } |
1995 | ||
1996 | static int selinux_syslog(int type) | |
1997 | { | |
1998 | int rc; | |
1999 | ||
2000 | rc = secondary_ops->syslog(type); | |
2001 | if (rc) | |
2002 | return rc; | |
2003 | ||
2004 | switch (type) { | |
828dfe1d EP |
2005 | case 3: /* Read last kernel messages */ |
2006 | case 10: /* Return size of the log buffer */ | |
2007 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
2008 | break; | |
2009 | case 6: /* Disable logging to console */ | |
2010 | case 7: /* Enable logging to console */ | |
2011 | case 8: /* Set level of messages printed to console */ | |
2012 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
2013 | break; | |
2014 | case 0: /* Close log */ | |
2015 | case 1: /* Open log */ | |
2016 | case 2: /* Read from log */ | |
2017 | case 4: /* Read/clear last kernel messages */ | |
2018 | case 5: /* Clear ring buffer */ | |
2019 | default: | |
2020 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
2021 | break; | |
1da177e4 LT |
2022 | } |
2023 | return rc; | |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * Check that a process has enough memory to allocate a new virtual | |
2028 | * mapping. 0 means there is enough memory for the allocation to | |
2029 | * succeed and -ENOMEM implies there is not. | |
2030 | * | |
2031 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 | |
2032 | * if the capability is granted, but __vm_enough_memory requires 1 if | |
2033 | * the capability is granted. | |
2034 | * | |
2035 | * Do not audit the selinux permission check, as this is applied to all | |
2036 | * processes that allocate mappings. | |
2037 | */ | |
34b4e4aa | 2038 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
1da177e4 LT |
2039 | { |
2040 | int rc, cap_sys_admin = 0; | |
1da177e4 | 2041 | |
3699c53c DH |
2042 | rc = selinux_capable(current, current_cred(), CAP_SYS_ADMIN, |
2043 | SECURITY_CAP_NOAUDIT); | |
1da177e4 LT |
2044 | if (rc == 0) |
2045 | cap_sys_admin = 1; | |
2046 | ||
34b4e4aa | 2047 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
1da177e4 LT |
2048 | } |
2049 | ||
2050 | /* binprm security operations */ | |
2051 | ||
a6f76f23 | 2052 | static int selinux_bprm_set_creds(struct linux_binprm *bprm) |
1da177e4 | 2053 | { |
a6f76f23 DH |
2054 | const struct task_security_struct *old_tsec; |
2055 | struct task_security_struct *new_tsec; | |
1da177e4 | 2056 | struct inode_security_struct *isec; |
1da177e4 | 2057 | struct avc_audit_data ad; |
a6f76f23 | 2058 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
2059 | int rc; |
2060 | ||
a6f76f23 | 2061 | rc = secondary_ops->bprm_set_creds(bprm); |
1da177e4 LT |
2062 | if (rc) |
2063 | return rc; | |
2064 | ||
a6f76f23 DH |
2065 | /* SELinux context only depends on initial program or script and not |
2066 | * the script interpreter */ | |
2067 | if (bprm->cred_prepared) | |
1da177e4 LT |
2068 | return 0; |
2069 | ||
a6f76f23 DH |
2070 | old_tsec = current_security(); |
2071 | new_tsec = bprm->cred->security; | |
1da177e4 LT |
2072 | isec = inode->i_security; |
2073 | ||
2074 | /* Default to the current task SID. */ | |
a6f76f23 DH |
2075 | new_tsec->sid = old_tsec->sid; |
2076 | new_tsec->osid = old_tsec->sid; | |
1da177e4 | 2077 | |
28eba5bf | 2078 | /* Reset fs, key, and sock SIDs on execve. */ |
a6f76f23 DH |
2079 | new_tsec->create_sid = 0; |
2080 | new_tsec->keycreate_sid = 0; | |
2081 | new_tsec->sockcreate_sid = 0; | |
1da177e4 | 2082 | |
a6f76f23 DH |
2083 | if (old_tsec->exec_sid) { |
2084 | new_tsec->sid = old_tsec->exec_sid; | |
1da177e4 | 2085 | /* Reset exec SID on execve. */ |
a6f76f23 | 2086 | new_tsec->exec_sid = 0; |
1da177e4 LT |
2087 | } else { |
2088 | /* Check for a default transition on this program. */ | |
a6f76f23 DH |
2089 | rc = security_transition_sid(old_tsec->sid, isec->sid, |
2090 | SECCLASS_PROCESS, &new_tsec->sid); | |
1da177e4 LT |
2091 | if (rc) |
2092 | return rc; | |
2093 | } | |
2094 | ||
2095 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 2096 | ad.u.fs.path = bprm->file->f_path; |
1da177e4 | 2097 | |
3d5ff529 | 2098 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
a6f76f23 | 2099 | new_tsec->sid = old_tsec->sid; |
1da177e4 | 2100 | |
a6f76f23 DH |
2101 | if (new_tsec->sid == old_tsec->sid) { |
2102 | rc = avc_has_perm(old_tsec->sid, isec->sid, | |
1da177e4 LT |
2103 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
2104 | if (rc) | |
2105 | return rc; | |
2106 | } else { | |
2107 | /* Check permissions for the transition. */ | |
a6f76f23 | 2108 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
1da177e4 LT |
2109 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
2110 | if (rc) | |
2111 | return rc; | |
2112 | ||
a6f76f23 | 2113 | rc = avc_has_perm(new_tsec->sid, isec->sid, |
1da177e4 LT |
2114 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
2115 | if (rc) | |
2116 | return rc; | |
2117 | ||
a6f76f23 DH |
2118 | /* Check for shared state */ |
2119 | if (bprm->unsafe & LSM_UNSAFE_SHARE) { | |
2120 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, | |
2121 | SECCLASS_PROCESS, PROCESS__SHARE, | |
2122 | NULL); | |
2123 | if (rc) | |
2124 | return -EPERM; | |
2125 | } | |
2126 | ||
2127 | /* Make sure that anyone attempting to ptrace over a task that | |
2128 | * changes its SID has the appropriate permit */ | |
2129 | if (bprm->unsafe & | |
2130 | (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
2131 | struct task_struct *tracer; | |
2132 | struct task_security_struct *sec; | |
2133 | u32 ptsid = 0; | |
2134 | ||
2135 | rcu_read_lock(); | |
2136 | tracer = tracehook_tracer_task(current); | |
2137 | if (likely(tracer != NULL)) { | |
2138 | sec = __task_cred(tracer)->security; | |
2139 | ptsid = sec->sid; | |
2140 | } | |
2141 | rcu_read_unlock(); | |
2142 | ||
2143 | if (ptsid != 0) { | |
2144 | rc = avc_has_perm(ptsid, new_tsec->sid, | |
2145 | SECCLASS_PROCESS, | |
2146 | PROCESS__PTRACE, NULL); | |
2147 | if (rc) | |
2148 | return -EPERM; | |
2149 | } | |
2150 | } | |
1da177e4 | 2151 | |
a6f76f23 DH |
2152 | /* Clear any possibly unsafe personality bits on exec: */ |
2153 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
1da177e4 LT |
2154 | } |
2155 | ||
1da177e4 LT |
2156 | return 0; |
2157 | } | |
2158 | ||
828dfe1d | 2159 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
1da177e4 LT |
2160 | { |
2161 | return secondary_ops->bprm_check_security(bprm); | |
2162 | } | |
2163 | ||
828dfe1d | 2164 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
1da177e4 | 2165 | { |
275bb41e DH |
2166 | const struct cred *cred = current_cred(); |
2167 | const struct task_security_struct *tsec = cred->security; | |
2168 | u32 sid, osid; | |
1da177e4 LT |
2169 | int atsecure = 0; |
2170 | ||
275bb41e DH |
2171 | sid = tsec->sid; |
2172 | osid = tsec->osid; | |
2173 | ||
2174 | if (osid != sid) { | |
1da177e4 LT |
2175 | /* Enable secure mode for SIDs transitions unless |
2176 | the noatsecure permission is granted between | |
2177 | the two SIDs, i.e. ahp returns 0. */ | |
275bb41e | 2178 | atsecure = avc_has_perm(osid, sid, |
a6f76f23 DH |
2179 | SECCLASS_PROCESS, |
2180 | PROCESS__NOATSECURE, NULL); | |
1da177e4 LT |
2181 | } |
2182 | ||
2183 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); | |
2184 | } | |
2185 | ||
1da177e4 LT |
2186 | extern struct vfsmount *selinuxfs_mount; |
2187 | extern struct dentry *selinux_null; | |
2188 | ||
2189 | /* Derived from fs/exec.c:flush_old_files. */ | |
745ca247 DH |
2190 | static inline void flush_unauthorized_files(const struct cred *cred, |
2191 | struct files_struct *files) | |
1da177e4 LT |
2192 | { |
2193 | struct avc_audit_data ad; | |
2194 | struct file *file, *devnull = NULL; | |
b20c8122 | 2195 | struct tty_struct *tty; |
badf1662 | 2196 | struct fdtable *fdt; |
1da177e4 | 2197 | long j = -1; |
24ec839c | 2198 | int drop_tty = 0; |
1da177e4 | 2199 | |
24ec839c | 2200 | tty = get_current_tty(); |
1da177e4 LT |
2201 | if (tty) { |
2202 | file_list_lock(); | |
37dd0bd0 EP |
2203 | if (!list_empty(&tty->tty_files)) { |
2204 | struct inode *inode; | |
2205 | ||
1da177e4 LT |
2206 | /* Revalidate access to controlling tty. |
2207 | Use inode_has_perm on the tty inode directly rather | |
2208 | than using file_has_perm, as this particular open | |
2209 | file may belong to another process and we are only | |
2210 | interested in the inode-based check here. */ | |
37dd0bd0 EP |
2211 | file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list); |
2212 | inode = file->f_path.dentry->d_inode; | |
88e67f3b | 2213 | if (inode_has_perm(cred, inode, |
1da177e4 | 2214 | FILE__READ | FILE__WRITE, NULL)) { |
24ec839c | 2215 | drop_tty = 1; |
1da177e4 LT |
2216 | } |
2217 | } | |
2218 | file_list_unlock(); | |
452a00d2 | 2219 | tty_kref_put(tty); |
1da177e4 | 2220 | } |
98a27ba4 EB |
2221 | /* Reset controlling tty. */ |
2222 | if (drop_tty) | |
2223 | no_tty(); | |
1da177e4 LT |
2224 | |
2225 | /* Revalidate access to inherited open files. */ | |
2226 | ||
828dfe1d | 2227 | AVC_AUDIT_DATA_INIT(&ad, FS); |
1da177e4 LT |
2228 | |
2229 | spin_lock(&files->file_lock); | |
2230 | for (;;) { | |
2231 | unsigned long set, i; | |
2232 | int fd; | |
2233 | ||
2234 | j++; | |
2235 | i = j * __NFDBITS; | |
badf1662 | 2236 | fdt = files_fdtable(files); |
bbea9f69 | 2237 | if (i >= fdt->max_fds) |
1da177e4 | 2238 | break; |
badf1662 | 2239 | set = fdt->open_fds->fds_bits[j]; |
1da177e4 LT |
2240 | if (!set) |
2241 | continue; | |
2242 | spin_unlock(&files->file_lock); | |
828dfe1d | 2243 | for ( ; set ; i++, set >>= 1) { |
1da177e4 LT |
2244 | if (set & 1) { |
2245 | file = fget(i); | |
2246 | if (!file) | |
2247 | continue; | |
88e67f3b | 2248 | if (file_has_perm(cred, |
1da177e4 LT |
2249 | file, |
2250 | file_to_av(file))) { | |
2251 | sys_close(i); | |
2252 | fd = get_unused_fd(); | |
2253 | if (fd != i) { | |
2254 | if (fd >= 0) | |
2255 | put_unused_fd(fd); | |
2256 | fput(file); | |
2257 | continue; | |
2258 | } | |
2259 | if (devnull) { | |
095975da | 2260 | get_file(devnull); |
1da177e4 | 2261 | } else { |
745ca247 DH |
2262 | devnull = dentry_open( |
2263 | dget(selinux_null), | |
2264 | mntget(selinuxfs_mount), | |
2265 | O_RDWR, cred); | |
fc5d81e6 AM |
2266 | if (IS_ERR(devnull)) { |
2267 | devnull = NULL; | |
1da177e4 LT |
2268 | put_unused_fd(fd); |
2269 | fput(file); | |
2270 | continue; | |
2271 | } | |
2272 | } | |
2273 | fd_install(fd, devnull); | |
2274 | } | |
2275 | fput(file); | |
2276 | } | |
2277 | } | |
2278 | spin_lock(&files->file_lock); | |
2279 | ||
2280 | } | |
2281 | spin_unlock(&files->file_lock); | |
2282 | } | |
2283 | ||
a6f76f23 DH |
2284 | /* |
2285 | * Prepare a process for imminent new credential changes due to exec | |
2286 | */ | |
2287 | static void selinux_bprm_committing_creds(struct linux_binprm *bprm) | |
1da177e4 | 2288 | { |
a6f76f23 DH |
2289 | struct task_security_struct *new_tsec; |
2290 | struct rlimit *rlim, *initrlim; | |
2291 | int rc, i; | |
d84f4f99 | 2292 | |
a6f76f23 | 2293 | secondary_ops->bprm_committing_creds(bprm); |
1da177e4 | 2294 | |
a6f76f23 DH |
2295 | new_tsec = bprm->cred->security; |
2296 | if (new_tsec->sid == new_tsec->osid) | |
2297 | return; | |
1da177e4 | 2298 | |
a6f76f23 DH |
2299 | /* Close files for which the new task SID is not authorized. */ |
2300 | flush_unauthorized_files(bprm->cred, current->files); | |
0356357c | 2301 | |
a6f76f23 DH |
2302 | /* Always clear parent death signal on SID transitions. */ |
2303 | current->pdeath_signal = 0; | |
0356357c | 2304 | |
a6f76f23 DH |
2305 | /* Check whether the new SID can inherit resource limits from the old |
2306 | * SID. If not, reset all soft limits to the lower of the current | |
2307 | * task's hard limit and the init task's soft limit. | |
2308 | * | |
2309 | * Note that the setting of hard limits (even to lower them) can be | |
2310 | * controlled by the setrlimit check. The inclusion of the init task's | |
2311 | * soft limit into the computation is to avoid resetting soft limits | |
2312 | * higher than the default soft limit for cases where the default is | |
2313 | * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. | |
2314 | */ | |
2315 | rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, | |
2316 | PROCESS__RLIMITINH, NULL); | |
2317 | if (rc) { | |
2318 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2319 | rlim = current->signal->rlim + i; | |
2320 | initrlim = init_task.signal->rlim + i; | |
2321 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); | |
1da177e4 | 2322 | } |
a6f76f23 | 2323 | update_rlimit_cpu(rlim->rlim_cur); |
1da177e4 LT |
2324 | } |
2325 | } | |
2326 | ||
2327 | /* | |
a6f76f23 DH |
2328 | * Clean up the process immediately after the installation of new credentials |
2329 | * due to exec | |
1da177e4 | 2330 | */ |
a6f76f23 | 2331 | static void selinux_bprm_committed_creds(struct linux_binprm *bprm) |
1da177e4 | 2332 | { |
a6f76f23 | 2333 | const struct task_security_struct *tsec = current_security(); |
1da177e4 | 2334 | struct itimerval itimer; |
41d9f9c5 | 2335 | struct sighand_struct *psig; |
a6f76f23 | 2336 | u32 osid, sid; |
1da177e4 | 2337 | int rc, i; |
41d9f9c5 | 2338 | unsigned long flags; |
1da177e4 | 2339 | |
a6f76f23 | 2340 | secondary_ops->bprm_committed_creds(bprm); |
1da177e4 | 2341 | |
a6f76f23 DH |
2342 | osid = tsec->osid; |
2343 | sid = tsec->sid; | |
2344 | ||
2345 | if (sid == osid) | |
1da177e4 LT |
2346 | return; |
2347 | ||
a6f76f23 DH |
2348 | /* Check whether the new SID can inherit signal state from the old SID. |
2349 | * If not, clear itimers to avoid subsequent signal generation and | |
2350 | * flush and unblock signals. | |
2351 | * | |
2352 | * This must occur _after_ the task SID has been updated so that any | |
2353 | * kill done after the flush will be checked against the new SID. | |
2354 | */ | |
2355 | rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); | |
1da177e4 LT |
2356 | if (rc) { |
2357 | memset(&itimer, 0, sizeof itimer); | |
2358 | for (i = 0; i < 3; i++) | |
2359 | do_setitimer(i, &itimer, NULL); | |
2360 | flush_signals(current); | |
2361 | spin_lock_irq(¤t->sighand->siglock); | |
2362 | flush_signal_handlers(current, 1); | |
2363 | sigemptyset(¤t->blocked); | |
2364 | recalc_sigpending(); | |
2365 | spin_unlock_irq(¤t->sighand->siglock); | |
2366 | } | |
2367 | ||
a6f76f23 DH |
2368 | /* Wake up the parent if it is waiting so that it can recheck |
2369 | * wait permission to the new task SID. */ | |
41d9f9c5 EP |
2370 | read_lock_irq(&tasklist_lock); |
2371 | psig = current->parent->sighand; | |
2372 | spin_lock_irqsave(&psig->siglock, flags); | |
1da177e4 | 2373 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
41d9f9c5 EP |
2374 | spin_unlock_irqrestore(&psig->siglock, flags); |
2375 | read_unlock_irq(&tasklist_lock); | |
1da177e4 LT |
2376 | } |
2377 | ||
2378 | /* superblock security operations */ | |
2379 | ||
2380 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2381 | { | |
2382 | return superblock_alloc_security(sb); | |
2383 | } | |
2384 | ||
2385 | static void selinux_sb_free_security(struct super_block *sb) | |
2386 | { | |
2387 | superblock_free_security(sb); | |
2388 | } | |
2389 | ||
2390 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2391 | { | |
2392 | if (plen > olen) | |
2393 | return 0; | |
2394 | ||
2395 | return !memcmp(prefix, option, plen); | |
2396 | } | |
2397 | ||
2398 | static inline int selinux_option(char *option, int len) | |
2399 | { | |
832cbd9a EP |
2400 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
2401 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || | |
2402 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || | |
2403 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); | |
1da177e4 LT |
2404 | } |
2405 | ||
2406 | static inline void take_option(char **to, char *from, int *first, int len) | |
2407 | { | |
2408 | if (!*first) { | |
2409 | **to = ','; | |
2410 | *to += 1; | |
3528a953 | 2411 | } else |
1da177e4 LT |
2412 | *first = 0; |
2413 | memcpy(*to, from, len); | |
2414 | *to += len; | |
2415 | } | |
2416 | ||
828dfe1d EP |
2417 | static inline void take_selinux_option(char **to, char *from, int *first, |
2418 | int len) | |
3528a953 CO |
2419 | { |
2420 | int current_size = 0; | |
2421 | ||
2422 | if (!*first) { | |
2423 | **to = '|'; | |
2424 | *to += 1; | |
828dfe1d | 2425 | } else |
3528a953 CO |
2426 | *first = 0; |
2427 | ||
2428 | while (current_size < len) { | |
2429 | if (*from != '"') { | |
2430 | **to = *from; | |
2431 | *to += 1; | |
2432 | } | |
2433 | from += 1; | |
2434 | current_size += 1; | |
2435 | } | |
2436 | } | |
2437 | ||
e0007529 | 2438 | static int selinux_sb_copy_data(char *orig, char *copy) |
1da177e4 LT |
2439 | { |
2440 | int fnosec, fsec, rc = 0; | |
2441 | char *in_save, *in_curr, *in_end; | |
2442 | char *sec_curr, *nosec_save, *nosec; | |
3528a953 | 2443 | int open_quote = 0; |
1da177e4 LT |
2444 | |
2445 | in_curr = orig; | |
2446 | sec_curr = copy; | |
2447 | ||
1da177e4 LT |
2448 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
2449 | if (!nosec) { | |
2450 | rc = -ENOMEM; | |
2451 | goto out; | |
2452 | } | |
2453 | ||
2454 | nosec_save = nosec; | |
2455 | fnosec = fsec = 1; | |
2456 | in_save = in_end = orig; | |
2457 | ||
2458 | do { | |
3528a953 CO |
2459 | if (*in_end == '"') |
2460 | open_quote = !open_quote; | |
2461 | if ((*in_end == ',' && open_quote == 0) || | |
2462 | *in_end == '\0') { | |
1da177e4 LT |
2463 | int len = in_end - in_curr; |
2464 | ||
2465 | if (selinux_option(in_curr, len)) | |
3528a953 | 2466 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
1da177e4 LT |
2467 | else |
2468 | take_option(&nosec, in_curr, &fnosec, len); | |
2469 | ||
2470 | in_curr = in_end + 1; | |
2471 | } | |
2472 | } while (*in_end++); | |
2473 | ||
6931dfc9 | 2474 | strcpy(in_save, nosec_save); |
da3caa20 | 2475 | free_page((unsigned long)nosec_save); |
1da177e4 LT |
2476 | out: |
2477 | return rc; | |
2478 | } | |
2479 | ||
12204e24 | 2480 | static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data) |
1da177e4 | 2481 | { |
88e67f3b | 2482 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2483 | struct avc_audit_data ad; |
2484 | int rc; | |
2485 | ||
2486 | rc = superblock_doinit(sb, data); | |
2487 | if (rc) | |
2488 | return rc; | |
2489 | ||
74192246 JM |
2490 | /* Allow all mounts performed by the kernel */ |
2491 | if (flags & MS_KERNMOUNT) | |
2492 | return 0; | |
2493 | ||
828dfe1d | 2494 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2495 | ad.u.fs.path.dentry = sb->s_root; |
88e67f3b | 2496 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); |
1da177e4 LT |
2497 | } |
2498 | ||
726c3342 | 2499 | static int selinux_sb_statfs(struct dentry *dentry) |
1da177e4 | 2500 | { |
88e67f3b | 2501 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2502 | struct avc_audit_data ad; |
2503 | ||
828dfe1d | 2504 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2505 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
88e67f3b | 2506 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
1da177e4 LT |
2507 | } |
2508 | ||
828dfe1d | 2509 | static int selinux_mount(char *dev_name, |
b5266eb4 | 2510 | struct path *path, |
828dfe1d EP |
2511 | char *type, |
2512 | unsigned long flags, | |
2513 | void *data) | |
1da177e4 | 2514 | { |
88e67f3b | 2515 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2516 | int rc; |
2517 | ||
b5266eb4 | 2518 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
1da177e4 LT |
2519 | if (rc) |
2520 | return rc; | |
2521 | ||
2522 | if (flags & MS_REMOUNT) | |
88e67f3b | 2523 | return superblock_has_perm(cred, path->mnt->mnt_sb, |
828dfe1d | 2524 | FILESYSTEM__REMOUNT, NULL); |
1da177e4 | 2525 | else |
88e67f3b | 2526 | return dentry_has_perm(cred, path->mnt, path->dentry, |
828dfe1d | 2527 | FILE__MOUNTON); |
1da177e4 LT |
2528 | } |
2529 | ||
2530 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2531 | { | |
88e67f3b | 2532 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2533 | int rc; |
2534 | ||
2535 | rc = secondary_ops->sb_umount(mnt, flags); | |
2536 | if (rc) | |
2537 | return rc; | |
2538 | ||
88e67f3b | 2539 | return superblock_has_perm(cred, mnt->mnt_sb, |
828dfe1d | 2540 | FILESYSTEM__UNMOUNT, NULL); |
1da177e4 LT |
2541 | } |
2542 | ||
2543 | /* inode security operations */ | |
2544 | ||
2545 | static int selinux_inode_alloc_security(struct inode *inode) | |
2546 | { | |
2547 | return inode_alloc_security(inode); | |
2548 | } | |
2549 | ||
2550 | static void selinux_inode_free_security(struct inode *inode) | |
2551 | { | |
2552 | inode_free_security(inode); | |
2553 | } | |
2554 | ||
5e41ff9e SS |
2555 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
2556 | char **name, void **value, | |
2557 | size_t *len) | |
2558 | { | |
275bb41e DH |
2559 | const struct cred *cred = current_cred(); |
2560 | const struct task_security_struct *tsec = cred->security; | |
5e41ff9e SS |
2561 | struct inode_security_struct *dsec; |
2562 | struct superblock_security_struct *sbsec; | |
275bb41e | 2563 | u32 sid, newsid, clen; |
5e41ff9e | 2564 | int rc; |
570bc1c2 | 2565 | char *namep = NULL, *context; |
5e41ff9e | 2566 | |
5e41ff9e SS |
2567 | dsec = dir->i_security; |
2568 | sbsec = dir->i_sb->s_security; | |
5e41ff9e | 2569 | |
275bb41e DH |
2570 | sid = tsec->sid; |
2571 | newsid = tsec->create_sid; | |
2572 | ||
2573 | if (!newsid || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) { | |
2574 | rc = security_transition_sid(sid, dsec->sid, | |
5e41ff9e SS |
2575 | inode_mode_to_security_class(inode->i_mode), |
2576 | &newsid); | |
2577 | if (rc) { | |
2578 | printk(KERN_WARNING "%s: " | |
2579 | "security_transition_sid failed, rc=%d (dev=%s " | |
2580 | "ino=%ld)\n", | |
dd6f953a | 2581 | __func__, |
5e41ff9e SS |
2582 | -rc, inode->i_sb->s_id, inode->i_ino); |
2583 | return rc; | |
2584 | } | |
2585 | } | |
2586 | ||
296fddf7 EP |
2587 | /* Possibly defer initialization to selinux_complete_init. */ |
2588 | if (sbsec->initialized) { | |
2589 | struct inode_security_struct *isec = inode->i_security; | |
2590 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2591 | isec->sid = newsid; | |
2592 | isec->initialized = 1; | |
2593 | } | |
5e41ff9e | 2594 | |
8aad3875 | 2595 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
25a74f3b SS |
2596 | return -EOPNOTSUPP; |
2597 | ||
570bc1c2 | 2598 | if (name) { |
a02fe132 | 2599 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
570bc1c2 SS |
2600 | if (!namep) |
2601 | return -ENOMEM; | |
2602 | *name = namep; | |
2603 | } | |
5e41ff9e | 2604 | |
570bc1c2 | 2605 | if (value && len) { |
12b29f34 | 2606 | rc = security_sid_to_context_force(newsid, &context, &clen); |
570bc1c2 SS |
2607 | if (rc) { |
2608 | kfree(namep); | |
2609 | return rc; | |
2610 | } | |
2611 | *value = context; | |
2612 | *len = clen; | |
5e41ff9e | 2613 | } |
5e41ff9e | 2614 | |
5e41ff9e SS |
2615 | return 0; |
2616 | } | |
2617 | ||
1da177e4 LT |
2618 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
2619 | { | |
2620 | return may_create(dir, dentry, SECCLASS_FILE); | |
2621 | } | |
2622 | ||
1da177e4 LT |
2623 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
2624 | { | |
2625 | int rc; | |
2626 | ||
828dfe1d | 2627 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
1da177e4 LT |
2628 | if (rc) |
2629 | return rc; | |
2630 | return may_link(dir, old_dentry, MAY_LINK); | |
2631 | } | |
2632 | ||
1da177e4 LT |
2633 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
2634 | { | |
2635 | int rc; | |
2636 | ||
2637 | rc = secondary_ops->inode_unlink(dir, dentry); | |
2638 | if (rc) | |
2639 | return rc; | |
2640 | return may_link(dir, dentry, MAY_UNLINK); | |
2641 | } | |
2642 | ||
2643 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2644 | { | |
2645 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2646 | } | |
2647 | ||
1da177e4 LT |
2648 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
2649 | { | |
2650 | return may_create(dir, dentry, SECCLASS_DIR); | |
2651 | } | |
2652 | ||
1da177e4 LT |
2653 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
2654 | { | |
2655 | return may_link(dir, dentry, MAY_RMDIR); | |
2656 | } | |
2657 | ||
2658 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2659 | { | |
2660 | int rc; | |
2661 | ||
2662 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); | |
2663 | if (rc) | |
2664 | return rc; | |
2665 | ||
2666 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2667 | } | |
2668 | ||
1da177e4 | 2669 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
828dfe1d | 2670 | struct inode *new_inode, struct dentry *new_dentry) |
1da177e4 LT |
2671 | { |
2672 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2673 | } | |
2674 | ||
1da177e4 LT |
2675 | static int selinux_inode_readlink(struct dentry *dentry) |
2676 | { | |
88e67f3b DH |
2677 | const struct cred *cred = current_cred(); |
2678 | ||
2679 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); | |
1da177e4 LT |
2680 | } |
2681 | ||
2682 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2683 | { | |
88e67f3b | 2684 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2685 | int rc; |
2686 | ||
828dfe1d | 2687 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
1da177e4 LT |
2688 | if (rc) |
2689 | return rc; | |
88e67f3b | 2690 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); |
1da177e4 LT |
2691 | } |
2692 | ||
b77b0646 | 2693 | static int selinux_inode_permission(struct inode *inode, int mask) |
1da177e4 | 2694 | { |
88e67f3b | 2695 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2696 | int rc; |
2697 | ||
b77b0646 | 2698 | rc = secondary_ops->inode_permission(inode, mask); |
1da177e4 LT |
2699 | if (rc) |
2700 | return rc; | |
2701 | ||
2702 | if (!mask) { | |
2703 | /* No permission to check. Existence test. */ | |
2704 | return 0; | |
2705 | } | |
2706 | ||
88e67f3b | 2707 | return inode_has_perm(cred, inode, |
8b6a5a37 | 2708 | file_mask_to_av(inode->i_mode, mask), NULL); |
1da177e4 LT |
2709 | } |
2710 | ||
2711 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2712 | { | |
88e67f3b | 2713 | const struct cred *cred = current_cred(); |
1da177e4 LT |
2714 | int rc; |
2715 | ||
2716 | rc = secondary_ops->inode_setattr(dentry, iattr); | |
2717 | if (rc) | |
2718 | return rc; | |
2719 | ||
2720 | if (iattr->ia_valid & ATTR_FORCE) | |
2721 | return 0; | |
2722 | ||
2723 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2724 | ATTR_ATIME_SET | ATTR_MTIME_SET)) | |
88e67f3b | 2725 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
1da177e4 | 2726 | |
88e67f3b | 2727 | return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); |
1da177e4 LT |
2728 | } |
2729 | ||
2730 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2731 | { | |
88e67f3b DH |
2732 | const struct cred *cred = current_cred(); |
2733 | ||
2734 | return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR); | |
1da177e4 LT |
2735 | } |
2736 | ||
8f0cfa52 | 2737 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
b5376771 | 2738 | { |
88e67f3b DH |
2739 | const struct cred *cred = current_cred(); |
2740 | ||
b5376771 SH |
2741 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
2742 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2743 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2744 | if (!capable(CAP_SETFCAP)) | |
2745 | return -EPERM; | |
2746 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2747 | /* A different attribute in the security namespace. | |
2748 | Restrict to administrator. */ | |
2749 | return -EPERM; | |
2750 | } | |
2751 | } | |
2752 | ||
2753 | /* Not an attribute we recognize, so just check the | |
2754 | ordinary setattr permission. */ | |
88e67f3b | 2755 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
b5376771 SH |
2756 | } |
2757 | ||
8f0cfa52 DH |
2758 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
2759 | const void *value, size_t size, int flags) | |
1da177e4 | 2760 | { |
1da177e4 LT |
2761 | struct inode *inode = dentry->d_inode; |
2762 | struct inode_security_struct *isec = inode->i_security; | |
2763 | struct superblock_security_struct *sbsec; | |
2764 | struct avc_audit_data ad; | |
275bb41e | 2765 | u32 newsid, sid = current_sid(); |
1da177e4 LT |
2766 | int rc = 0; |
2767 | ||
b5376771 SH |
2768 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2769 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2770 | |
2771 | sbsec = inode->i_sb->s_security; | |
2772 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) | |
2773 | return -EOPNOTSUPP; | |
2774 | ||
3bd858ab | 2775 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
2776 | return -EPERM; |
2777 | ||
828dfe1d | 2778 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2779 | ad.u.fs.path.dentry = dentry; |
1da177e4 | 2780 | |
275bb41e | 2781 | rc = avc_has_perm(sid, isec->sid, isec->sclass, |
1da177e4 LT |
2782 | FILE__RELABELFROM, &ad); |
2783 | if (rc) | |
2784 | return rc; | |
2785 | ||
2786 | rc = security_context_to_sid(value, size, &newsid); | |
12b29f34 SS |
2787 | if (rc == -EINVAL) { |
2788 | if (!capable(CAP_MAC_ADMIN)) | |
2789 | return rc; | |
2790 | rc = security_context_to_sid_force(value, size, &newsid); | |
2791 | } | |
1da177e4 LT |
2792 | if (rc) |
2793 | return rc; | |
2794 | ||
275bb41e | 2795 | rc = avc_has_perm(sid, newsid, isec->sclass, |
1da177e4 LT |
2796 | FILE__RELABELTO, &ad); |
2797 | if (rc) | |
2798 | return rc; | |
2799 | ||
275bb41e | 2800 | rc = security_validate_transition(isec->sid, newsid, sid, |
828dfe1d | 2801 | isec->sclass); |
1da177e4 LT |
2802 | if (rc) |
2803 | return rc; | |
2804 | ||
2805 | return avc_has_perm(newsid, | |
2806 | sbsec->sid, | |
2807 | SECCLASS_FILESYSTEM, | |
2808 | FILESYSTEM__ASSOCIATE, | |
2809 | &ad); | |
2810 | } | |
2811 | ||
8f0cfa52 | 2812 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
f5269710 | 2813 | const void *value, size_t size, |
8f0cfa52 | 2814 | int flags) |
1da177e4 LT |
2815 | { |
2816 | struct inode *inode = dentry->d_inode; | |
2817 | struct inode_security_struct *isec = inode->i_security; | |
2818 | u32 newsid; | |
2819 | int rc; | |
2820 | ||
2821 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2822 | /* Not an attribute we recognize, so nothing to do. */ | |
2823 | return; | |
2824 | } | |
2825 | ||
12b29f34 | 2826 | rc = security_context_to_sid_force(value, size, &newsid); |
1da177e4 | 2827 | if (rc) { |
12b29f34 SS |
2828 | printk(KERN_ERR "SELinux: unable to map context to SID" |
2829 | "for (%s, %lu), rc=%d\n", | |
2830 | inode->i_sb->s_id, inode->i_ino, -rc); | |
1da177e4 LT |
2831 | return; |
2832 | } | |
2833 | ||
2834 | isec->sid = newsid; | |
2835 | return; | |
2836 | } | |
2837 | ||
8f0cfa52 | 2838 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
1da177e4 | 2839 | { |
88e67f3b DH |
2840 | const struct cred *cred = current_cred(); |
2841 | ||
2842 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); | |
1da177e4 LT |
2843 | } |
2844 | ||
828dfe1d | 2845 | static int selinux_inode_listxattr(struct dentry *dentry) |
1da177e4 | 2846 | { |
88e67f3b DH |
2847 | const struct cred *cred = current_cred(); |
2848 | ||
2849 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); | |
1da177e4 LT |
2850 | } |
2851 | ||
8f0cfa52 | 2852 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 2853 | { |
b5376771 SH |
2854 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2855 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2856 | |
2857 | /* No one is allowed to remove a SELinux security label. | |
2858 | You can change the label, but all data must be labeled. */ | |
2859 | return -EACCES; | |
2860 | } | |
2861 | ||
d381d8a9 | 2862 | /* |
abc69bb6 | 2863 | * Copy the inode security context value to the user. |
d381d8a9 JM |
2864 | * |
2865 | * Permission check is handled by selinux_inode_getxattr hook. | |
2866 | */ | |
42492594 | 2867 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
1da177e4 | 2868 | { |
42492594 DQ |
2869 | u32 size; |
2870 | int error; | |
2871 | char *context = NULL; | |
1da177e4 | 2872 | struct inode_security_struct *isec = inode->i_security; |
d381d8a9 | 2873 | |
8c8570fb DK |
2874 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
2875 | return -EOPNOTSUPP; | |
d381d8a9 | 2876 | |
abc69bb6 SS |
2877 | /* |
2878 | * If the caller has CAP_MAC_ADMIN, then get the raw context | |
2879 | * value even if it is not defined by current policy; otherwise, | |
2880 | * use the in-core value under current policy. | |
2881 | * Use the non-auditing forms of the permission checks since | |
2882 | * getxattr may be called by unprivileged processes commonly | |
2883 | * and lack of permission just means that we fall back to the | |
2884 | * in-core context value, not a denial. | |
2885 | */ | |
3699c53c DH |
2886 | error = selinux_capable(current, current_cred(), CAP_MAC_ADMIN, |
2887 | SECURITY_CAP_NOAUDIT); | |
abc69bb6 SS |
2888 | if (!error) |
2889 | error = security_sid_to_context_force(isec->sid, &context, | |
2890 | &size); | |
2891 | else | |
2892 | error = security_sid_to_context(isec->sid, &context, &size); | |
42492594 DQ |
2893 | if (error) |
2894 | return error; | |
2895 | error = size; | |
2896 | if (alloc) { | |
2897 | *buffer = context; | |
2898 | goto out_nofree; | |
2899 | } | |
2900 | kfree(context); | |
2901 | out_nofree: | |
2902 | return error; | |
1da177e4 LT |
2903 | } |
2904 | ||
2905 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
828dfe1d | 2906 | const void *value, size_t size, int flags) |
1da177e4 LT |
2907 | { |
2908 | struct inode_security_struct *isec = inode->i_security; | |
2909 | u32 newsid; | |
2910 | int rc; | |
2911 | ||
2912 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2913 | return -EOPNOTSUPP; | |
2914 | ||
2915 | if (!value || !size) | |
2916 | return -EACCES; | |
2917 | ||
828dfe1d | 2918 | rc = security_context_to_sid((void *)value, size, &newsid); |
1da177e4 LT |
2919 | if (rc) |
2920 | return rc; | |
2921 | ||
2922 | isec->sid = newsid; | |
2923 | return 0; | |
2924 | } | |
2925 | ||
2926 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2927 | { | |
2928 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2929 | if (buffer && len <= buffer_size) | |
2930 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2931 | return len; | |
2932 | } | |
2933 | ||
b5376771 SH |
2934 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
2935 | { | |
2936 | return secondary_ops->inode_need_killpriv(dentry); | |
2937 | } | |
2938 | ||
2939 | static int selinux_inode_killpriv(struct dentry *dentry) | |
2940 | { | |
2941 | return secondary_ops->inode_killpriv(dentry); | |
2942 | } | |
2943 | ||
713a04ae AD |
2944 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
2945 | { | |
2946 | struct inode_security_struct *isec = inode->i_security; | |
2947 | *secid = isec->sid; | |
2948 | } | |
2949 | ||
1da177e4 LT |
2950 | /* file security operations */ |
2951 | ||
788e7dd4 | 2952 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
1da177e4 | 2953 | { |
88e67f3b | 2954 | const struct cred *cred = current_cred(); |
7420ed23 | 2955 | int rc; |
3d5ff529 | 2956 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2957 | |
2958 | if (!mask) { | |
2959 | /* No permission to check. Existence test. */ | |
2960 | return 0; | |
2961 | } | |
2962 | ||
2963 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2964 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2965 | mask |= MAY_APPEND; | |
2966 | ||
88e67f3b | 2967 | rc = file_has_perm(cred, file, |
7420ed23 VY |
2968 | file_mask_to_av(inode->i_mode, mask)); |
2969 | if (rc) | |
2970 | return rc; | |
2971 | ||
2972 | return selinux_netlbl_inode_permission(inode, mask); | |
1da177e4 LT |
2973 | } |
2974 | ||
788e7dd4 YN |
2975 | static int selinux_file_permission(struct file *file, int mask) |
2976 | { | |
2977 | struct inode *inode = file->f_path.dentry->d_inode; | |
788e7dd4 YN |
2978 | struct file_security_struct *fsec = file->f_security; |
2979 | struct inode_security_struct *isec = inode->i_security; | |
275bb41e | 2980 | u32 sid = current_sid(); |
788e7dd4 YN |
2981 | |
2982 | if (!mask) { | |
2983 | /* No permission to check. Existence test. */ | |
2984 | return 0; | |
2985 | } | |
2986 | ||
275bb41e | 2987 | if (sid == fsec->sid && fsec->isid == isec->sid |
788e7dd4 YN |
2988 | && fsec->pseqno == avc_policy_seqno()) |
2989 | return selinux_netlbl_inode_permission(inode, mask); | |
2990 | ||
2991 | return selinux_revalidate_file_permission(file, mask); | |
2992 | } | |
2993 | ||
1da177e4 LT |
2994 | static int selinux_file_alloc_security(struct file *file) |
2995 | { | |
2996 | return file_alloc_security(file); | |
2997 | } | |
2998 | ||
2999 | static void selinux_file_free_security(struct file *file) | |
3000 | { | |
3001 | file_free_security(file); | |
3002 | } | |
3003 | ||
3004 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
3005 | unsigned long arg) | |
3006 | { | |
88e67f3b | 3007 | const struct cred *cred = current_cred(); |
242631c4 | 3008 | u32 av = 0; |
1da177e4 | 3009 | |
242631c4 SS |
3010 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
3011 | av |= FILE__WRITE; | |
3012 | if (_IOC_DIR(cmd) & _IOC_READ) | |
3013 | av |= FILE__READ; | |
3014 | if (!av) | |
3015 | av = FILE__IOCTL; | |
1da177e4 | 3016 | |
88e67f3b | 3017 | return file_has_perm(cred, file, av); |
1da177e4 LT |
3018 | } |
3019 | ||
3020 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
3021 | { | |
88e67f3b | 3022 | const struct cred *cred = current_cred(); |
d84f4f99 | 3023 | int rc = 0; |
88e67f3b | 3024 | |
1da177e4 LT |
3025 | #ifndef CONFIG_PPC32 |
3026 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
3027 | /* | |
3028 | * We are making executable an anonymous mapping or a | |
3029 | * private file mapping that will also be writable. | |
3030 | * This has an additional check. | |
3031 | */ | |
d84f4f99 | 3032 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); |
1da177e4 | 3033 | if (rc) |
d84f4f99 | 3034 | goto error; |
1da177e4 LT |
3035 | } |
3036 | #endif | |
3037 | ||
3038 | if (file) { | |
3039 | /* read access is always possible with a mapping */ | |
3040 | u32 av = FILE__READ; | |
3041 | ||
3042 | /* write access only matters if the mapping is shared */ | |
3043 | if (shared && (prot & PROT_WRITE)) | |
3044 | av |= FILE__WRITE; | |
3045 | ||
3046 | if (prot & PROT_EXEC) | |
3047 | av |= FILE__EXECUTE; | |
3048 | ||
88e67f3b | 3049 | return file_has_perm(cred, file, av); |
1da177e4 | 3050 | } |
d84f4f99 DH |
3051 | |
3052 | error: | |
3053 | return rc; | |
1da177e4 LT |
3054 | } |
3055 | ||
3056 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
ed032189 EP |
3057 | unsigned long prot, unsigned long flags, |
3058 | unsigned long addr, unsigned long addr_only) | |
1da177e4 | 3059 | { |
ed032189 | 3060 | int rc = 0; |
275bb41e | 3061 | u32 sid = current_sid(); |
1da177e4 | 3062 | |
ed032189 EP |
3063 | if (addr < mmap_min_addr) |
3064 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
3065 | MEMPROTECT__MMAP_ZERO, NULL); | |
3066 | if (rc || addr_only) | |
1da177e4 LT |
3067 | return rc; |
3068 | ||
3069 | if (selinux_checkreqprot) | |
3070 | prot = reqprot; | |
3071 | ||
3072 | return file_map_prot_check(file, prot, | |
3073 | (flags & MAP_TYPE) == MAP_SHARED); | |
3074 | } | |
3075 | ||
3076 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
3077 | unsigned long reqprot, | |
3078 | unsigned long prot) | |
3079 | { | |
88e67f3b | 3080 | const struct cred *cred = current_cred(); |
1da177e4 LT |
3081 | int rc; |
3082 | ||
3083 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); | |
3084 | if (rc) | |
3085 | return rc; | |
3086 | ||
3087 | if (selinux_checkreqprot) | |
3088 | prot = reqprot; | |
3089 | ||
3090 | #ifndef CONFIG_PPC32 | |
db4c9641 SS |
3091 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
3092 | rc = 0; | |
3093 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
3094 | vma->vm_end <= vma->vm_mm->brk) { | |
d84f4f99 | 3095 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); |
db4c9641 SS |
3096 | } else if (!vma->vm_file && |
3097 | vma->vm_start <= vma->vm_mm->start_stack && | |
3098 | vma->vm_end >= vma->vm_mm->start_stack) { | |
3b11a1de | 3099 | rc = current_has_perm(current, PROCESS__EXECSTACK); |
db4c9641 SS |
3100 | } else if (vma->vm_file && vma->anon_vma) { |
3101 | /* | |
3102 | * We are making executable a file mapping that has | |
3103 | * had some COW done. Since pages might have been | |
3104 | * written, check ability to execute the possibly | |
3105 | * modified content. This typically should only | |
3106 | * occur for text relocations. | |
3107 | */ | |
d84f4f99 | 3108 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); |
db4c9641 | 3109 | } |