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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> | |
7 | * Chris Vance, <cvance@nai.com> | |
8 | * Wayne Salamon, <wsalamon@nai.com> | |
9 | * James Morris <jmorris@redhat.com> | |
10 | * | |
11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. | |
12 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
13 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. | |
14 | * <dgoeddel@trustedcs.com> | |
7420ed23 VY |
15 | * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. |
16 | * Paul Moore, <paul.moore@hp.com> | |
788e7dd4 YN |
17 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
18 | * Yuichi Nakamura <ynakam@hitachisoft.jp> | |
1da177e4 LT |
19 | * |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License version 2, | |
22 | * as published by the Free Software Foundation. | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/init.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/ptrace.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/security.h> | |
31 | #include <linux/xattr.h> | |
32 | #include <linux/capability.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/mman.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/pagemap.h> | |
38 | #include <linux/swap.h> | |
1da177e4 LT |
39 | #include <linux/spinlock.h> |
40 | #include <linux/syscalls.h> | |
41 | #include <linux/file.h> | |
42 | #include <linux/namei.h> | |
43 | #include <linux/mount.h> | |
44 | #include <linux/ext2_fs.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/kd.h> | |
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 LT |
52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
53 | #include <asm/uaccess.h> | |
1da177e4 LT |
54 | #include <asm/ioctls.h> |
55 | #include <linux/bitops.h> | |
56 | #include <linux/interrupt.h> | |
57 | #include <linux/netdevice.h> /* for network interface checks */ | |
58 | #include <linux/netlink.h> | |
59 | #include <linux/tcp.h> | |
60 | #include <linux/udp.h> | |
2ee92d46 | 61 | #include <linux/dccp.h> |
1da177e4 LT |
62 | #include <linux/quota.h> |
63 | #include <linux/un.h> /* for Unix socket types */ | |
64 | #include <net/af_unix.h> /* for Unix socket types */ | |
65 | #include <linux/parser.h> | |
66 | #include <linux/nfs_mount.h> | |
67 | #include <net/ipv6.h> | |
68 | #include <linux/hugetlb.h> | |
69 | #include <linux/personality.h> | |
70 | #include <linux/sysctl.h> | |
71 | #include <linux/audit.h> | |
6931dfc9 | 72 | #include <linux/string.h> |
877ce7c1 | 73 | #include <linux/selinux.h> |
23970741 | 74 | #include <linux/mutex.h> |
1da177e4 LT |
75 | |
76 | #include "avc.h" | |
77 | #include "objsec.h" | |
78 | #include "netif.h" | |
224dfbd8 | 79 | #include "netnode.h" |
d28d1e08 | 80 | #include "xfrm.h" |
c60475bf | 81 | #include "netlabel.h" |
1da177e4 LT |
82 | |
83 | #define XATTR_SELINUX_SUFFIX "selinux" | |
84 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX | |
85 | ||
c9180a57 EP |
86 | #define NUM_SEL_MNT_OPTS 4 |
87 | ||
1da177e4 LT |
88 | extern unsigned int policydb_loaded_version; |
89 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
4e5ab4cb | 90 | extern int selinux_compat_net; |
20510f2f | 91 | extern struct security_operations *security_ops; |
1da177e4 LT |
92 | |
93 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
94 | int selinux_enforcing = 0; | |
95 | ||
96 | static int __init enforcing_setup(char *str) | |
97 | { | |
98 | selinux_enforcing = simple_strtol(str,NULL,0); | |
99 | return 1; | |
100 | } | |
101 | __setup("enforcing=", enforcing_setup); | |
102 | #endif | |
103 | ||
104 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
105 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
106 | ||
107 | static int __init selinux_enabled_setup(char *str) | |
108 | { | |
109 | selinux_enabled = simple_strtol(str, NULL, 0); | |
110 | return 1; | |
111 | } | |
112 | __setup("selinux=", selinux_enabled_setup); | |
30d55280 SS |
113 | #else |
114 | int selinux_enabled = 1; | |
1da177e4 LT |
115 | #endif |
116 | ||
117 | /* Original (dummy) security module. */ | |
118 | static struct security_operations *original_ops = NULL; | |
119 | ||
120 | /* Minimal support for a secondary security module, | |
121 | just to allow the use of the dummy or capability modules. | |
122 | The owlsm module can alternatively be used as a secondary | |
123 | module as long as CONFIG_OWLSM_FD is not enabled. */ | |
124 | static struct security_operations *secondary_ops = NULL; | |
125 | ||
126 | /* Lists of inode and superblock security structures initialized | |
127 | before the policy was loaded. */ | |
128 | static LIST_HEAD(superblock_security_head); | |
129 | static DEFINE_SPINLOCK(sb_security_lock); | |
130 | ||
e18b890b | 131 | static struct kmem_cache *sel_inode_cache; |
7cae7e26 | 132 | |
8c8570fb DK |
133 | /* Return security context for a given sid or just the context |
134 | length if the buffer is null or length is 0 */ | |
135 | static int selinux_getsecurity(u32 sid, void *buffer, size_t size) | |
136 | { | |
137 | char *context; | |
138 | unsigned len; | |
139 | int rc; | |
140 | ||
141 | rc = security_sid_to_context(sid, &context, &len); | |
142 | if (rc) | |
143 | return rc; | |
144 | ||
145 | if (!buffer || !size) | |
146 | goto getsecurity_exit; | |
147 | ||
148 | if (size < len) { | |
149 | len = -ERANGE; | |
150 | goto getsecurity_exit; | |
151 | } | |
152 | memcpy(buffer, context, len); | |
153 | ||
154 | getsecurity_exit: | |
155 | kfree(context); | |
156 | return len; | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* Allocate and free functions for each kind of security blob. */ |
160 | ||
161 | static int task_alloc_security(struct task_struct *task) | |
162 | { | |
163 | struct task_security_struct *tsec; | |
164 | ||
89d155ef | 165 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
1da177e4 LT |
166 | if (!tsec) |
167 | return -ENOMEM; | |
168 | ||
1da177e4 LT |
169 | tsec->task = task; |
170 | tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED; | |
171 | task->security = tsec; | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static void task_free_security(struct task_struct *task) | |
177 | { | |
178 | struct task_security_struct *tsec = task->security; | |
1da177e4 LT |
179 | task->security = NULL; |
180 | kfree(tsec); | |
181 | } | |
182 | ||
183 | static int inode_alloc_security(struct inode *inode) | |
184 | { | |
185 | struct task_security_struct *tsec = current->security; | |
186 | struct inode_security_struct *isec; | |
187 | ||
c3762229 | 188 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_KERNEL); |
1da177e4 LT |
189 | if (!isec) |
190 | return -ENOMEM; | |
191 | ||
23970741 | 192 | mutex_init(&isec->lock); |
1da177e4 | 193 | INIT_LIST_HEAD(&isec->list); |
1da177e4 LT |
194 | isec->inode = inode; |
195 | isec->sid = SECINITSID_UNLABELED; | |
196 | isec->sclass = SECCLASS_FILE; | |
9ac49d22 | 197 | isec->task_sid = tsec->sid; |
1da177e4 LT |
198 | inode->i_security = isec; |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static void inode_free_security(struct inode *inode) | |
204 | { | |
205 | struct inode_security_struct *isec = inode->i_security; | |
206 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
207 | ||
1da177e4 LT |
208 | spin_lock(&sbsec->isec_lock); |
209 | if (!list_empty(&isec->list)) | |
210 | list_del_init(&isec->list); | |
211 | spin_unlock(&sbsec->isec_lock); | |
212 | ||
213 | inode->i_security = NULL; | |
7cae7e26 | 214 | kmem_cache_free(sel_inode_cache, isec); |
1da177e4 LT |
215 | } |
216 | ||
217 | static int file_alloc_security(struct file *file) | |
218 | { | |
219 | struct task_security_struct *tsec = current->security; | |
220 | struct file_security_struct *fsec; | |
221 | ||
26d2a4be | 222 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
1da177e4 LT |
223 | if (!fsec) |
224 | return -ENOMEM; | |
225 | ||
1da177e4 | 226 | fsec->file = file; |
9ac49d22 SS |
227 | fsec->sid = tsec->sid; |
228 | fsec->fown_sid = tsec->sid; | |
1da177e4 LT |
229 | file->f_security = fsec; |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static void file_free_security(struct file *file) | |
235 | { | |
236 | struct file_security_struct *fsec = file->f_security; | |
1da177e4 LT |
237 | file->f_security = NULL; |
238 | kfree(fsec); | |
239 | } | |
240 | ||
241 | static int superblock_alloc_security(struct super_block *sb) | |
242 | { | |
243 | struct superblock_security_struct *sbsec; | |
244 | ||
89d155ef | 245 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
1da177e4 LT |
246 | if (!sbsec) |
247 | return -ENOMEM; | |
248 | ||
bc7e982b | 249 | mutex_init(&sbsec->lock); |
1da177e4 LT |
250 | INIT_LIST_HEAD(&sbsec->list); |
251 | INIT_LIST_HEAD(&sbsec->isec_head); | |
252 | spin_lock_init(&sbsec->isec_lock); | |
1da177e4 LT |
253 | sbsec->sb = sb; |
254 | sbsec->sid = SECINITSID_UNLABELED; | |
255 | sbsec->def_sid = SECINITSID_FILE; | |
c312feb2 | 256 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
1da177e4 LT |
257 | sb->s_security = sbsec; |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static void superblock_free_security(struct super_block *sb) | |
263 | { | |
264 | struct superblock_security_struct *sbsec = sb->s_security; | |
265 | ||
1da177e4 LT |
266 | spin_lock(&sb_security_lock); |
267 | if (!list_empty(&sbsec->list)) | |
268 | list_del_init(&sbsec->list); | |
269 | spin_unlock(&sb_security_lock); | |
270 | ||
271 | sb->s_security = NULL; | |
272 | kfree(sbsec); | |
273 | } | |
274 | ||
7d877f3b | 275 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
1da177e4 LT |
276 | { |
277 | struct sk_security_struct *ssec; | |
278 | ||
89d155ef | 279 | ssec = kzalloc(sizeof(*ssec), priority); |
1da177e4 LT |
280 | if (!ssec) |
281 | return -ENOMEM; | |
282 | ||
1da177e4 LT |
283 | ssec->sk = sk; |
284 | ssec->peer_sid = SECINITSID_UNLABELED; | |
892c141e | 285 | ssec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
286 | sk->sk_security = ssec; |
287 | ||
99f59ed0 PM |
288 | selinux_netlbl_sk_security_init(ssec, family); |
289 | ||
1da177e4 LT |
290 | return 0; |
291 | } | |
292 | ||
293 | static void sk_free_security(struct sock *sk) | |
294 | { | |
295 | struct sk_security_struct *ssec = sk->sk_security; | |
296 | ||
1da177e4 LT |
297 | sk->sk_security = NULL; |
298 | kfree(ssec); | |
299 | } | |
1da177e4 LT |
300 | |
301 | /* The security server must be initialized before | |
302 | any labeling or access decisions can be provided. */ | |
303 | extern int ss_initialized; | |
304 | ||
305 | /* The file system's label must be initialized prior to use. */ | |
306 | ||
307 | static char *labeling_behaviors[6] = { | |
308 | "uses xattr", | |
309 | "uses transition SIDs", | |
310 | "uses task SIDs", | |
311 | "uses genfs_contexts", | |
312 | "not configured for labeling", | |
313 | "uses mountpoint labeling", | |
314 | }; | |
315 | ||
316 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
317 | ||
318 | static inline int inode_doinit(struct inode *inode) | |
319 | { | |
320 | return inode_doinit_with_dentry(inode, NULL); | |
321 | } | |
322 | ||
323 | enum { | |
31e87930 | 324 | Opt_error = -1, |
1da177e4 LT |
325 | Opt_context = 1, |
326 | Opt_fscontext = 2, | |
c9180a57 EP |
327 | Opt_defcontext = 3, |
328 | Opt_rootcontext = 4, | |
1da177e4 LT |
329 | }; |
330 | ||
331 | static match_table_t tokens = { | |
332 | {Opt_context, "context=%s"}, | |
333 | {Opt_fscontext, "fscontext=%s"}, | |
334 | {Opt_defcontext, "defcontext=%s"}, | |
0808925e | 335 | {Opt_rootcontext, "rootcontext=%s"}, |
31e87930 | 336 | {Opt_error, NULL}, |
1da177e4 LT |
337 | }; |
338 | ||
339 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
340 | ||
c312feb2 EP |
341 | static int may_context_mount_sb_relabel(u32 sid, |
342 | struct superblock_security_struct *sbsec, | |
343 | struct task_security_struct *tsec) | |
344 | { | |
345 | int rc; | |
346 | ||
347 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
348 | FILESYSTEM__RELABELFROM, NULL); | |
349 | if (rc) | |
350 | return rc; | |
351 | ||
352 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
353 | FILESYSTEM__RELABELTO, NULL); | |
354 | return rc; | |
355 | } | |
356 | ||
0808925e EP |
357 | static int may_context_mount_inode_relabel(u32 sid, |
358 | struct superblock_security_struct *sbsec, | |
359 | struct task_security_struct *tsec) | |
360 | { | |
361 | int rc; | |
362 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
363 | FILESYSTEM__RELABELFROM, NULL); | |
364 | if (rc) | |
365 | return rc; | |
366 | ||
367 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
368 | FILESYSTEM__ASSOCIATE, NULL); | |
369 | return rc; | |
370 | } | |
371 | ||
c9180a57 | 372 | static int sb_finish_set_opts(struct super_block *sb) |
1da177e4 | 373 | { |
1da177e4 | 374 | struct superblock_security_struct *sbsec = sb->s_security; |
c9180a57 EP |
375 | struct dentry *root = sb->s_root; |
376 | struct inode *root_inode = root->d_inode; | |
377 | int rc = 0; | |
1da177e4 | 378 | |
c9180a57 EP |
379 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
380 | /* Make sure that the xattr handler exists and that no | |
381 | error other than -ENODATA is returned by getxattr on | |
382 | the root directory. -ENODATA is ok, as this may be | |
383 | the first boot of the SELinux kernel before we have | |
384 | assigned xattr values to the filesystem. */ | |
385 | if (!root_inode->i_op->getxattr) { | |
386 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
387 | "xattr support\n", sb->s_id, sb->s_type->name); | |
388 | rc = -EOPNOTSUPP; | |
389 | goto out; | |
390 | } | |
391 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
392 | if (rc < 0 && rc != -ENODATA) { | |
393 | if (rc == -EOPNOTSUPP) | |
394 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
395 | "%s) has no security xattr handler\n", | |
396 | sb->s_id, sb->s_type->name); | |
397 | else | |
398 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
399 | "%s) getxattr errno %d\n", sb->s_id, | |
400 | sb->s_type->name, -rc); | |
401 | goto out; | |
402 | } | |
403 | } | |
1da177e4 | 404 | |
c9180a57 | 405 | sbsec->initialized = 1; |
1da177e4 | 406 | |
c9180a57 EP |
407 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
408 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
409 | sb->s_id, sb->s_type->name); | |
410 | else | |
411 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
412 | sb->s_id, sb->s_type->name, | |
413 | labeling_behaviors[sbsec->behavior-1]); | |
1da177e4 | 414 | |
c9180a57 EP |
415 | /* Initialize the root inode. */ |
416 | rc = inode_doinit_with_dentry(root_inode, root); | |
1da177e4 | 417 | |
c9180a57 EP |
418 | /* Initialize any other inodes associated with the superblock, e.g. |
419 | inodes created prior to initial policy load or inodes created | |
420 | during get_sb by a pseudo filesystem that directly | |
421 | populates itself. */ | |
422 | spin_lock(&sbsec->isec_lock); | |
423 | next_inode: | |
424 | if (!list_empty(&sbsec->isec_head)) { | |
425 | struct inode_security_struct *isec = | |
426 | list_entry(sbsec->isec_head.next, | |
427 | struct inode_security_struct, list); | |
428 | struct inode *inode = isec->inode; | |
429 | spin_unlock(&sbsec->isec_lock); | |
430 | inode = igrab(inode); | |
431 | if (inode) { | |
432 | if (!IS_PRIVATE(inode)) | |
433 | inode_doinit(inode); | |
434 | iput(inode); | |
435 | } | |
436 | spin_lock(&sbsec->isec_lock); | |
437 | list_del_init(&isec->list); | |
438 | goto next_inode; | |
439 | } | |
440 | spin_unlock(&sbsec->isec_lock); | |
441 | out: | |
442 | return rc; | |
443 | } | |
1da177e4 | 444 | |
c9180a57 EP |
445 | /* |
446 | * This function should allow an FS to ask what it's mount security | |
447 | * options were so it can use those later for submounts, displaying | |
448 | * mount options, or whatever. | |
449 | */ | |
450 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
451 | char ***mount_options, int **mnt_opts_flags, | |
452 | int *num_opts) | |
453 | { | |
454 | int rc = 0, i; | |
455 | struct superblock_security_struct *sbsec = sb->s_security; | |
456 | char *context = NULL; | |
457 | u32 len; | |
458 | char tmp; | |
1da177e4 | 459 | |
c9180a57 EP |
460 | *num_opts = 0; |
461 | *mount_options = NULL; | |
462 | *mnt_opts_flags = NULL; | |
1da177e4 | 463 | |
c9180a57 EP |
464 | if (!sbsec->initialized) |
465 | return -EINVAL; | |
1da177e4 | 466 | |
c9180a57 EP |
467 | if (!ss_initialized) |
468 | return -EINVAL; | |
1da177e4 | 469 | |
c9180a57 EP |
470 | /* |
471 | * if we ever use sbsec flags for anything other than tracking mount | |
472 | * settings this is going to need a mask | |
473 | */ | |
474 | tmp = sbsec->flags; | |
475 | /* count the number of mount options for this sb */ | |
476 | for (i = 0; i < 8; i++) { | |
477 | if (tmp & 0x01) | |
478 | (*num_opts)++; | |
479 | tmp >>= 1; | |
480 | } | |
1da177e4 | 481 | |
c9180a57 EP |
482 | *mount_options = kcalloc(*num_opts, sizeof(char *), GFP_ATOMIC); |
483 | if (!*mount_options) { | |
484 | rc = -ENOMEM; | |
485 | goto out_free; | |
486 | } | |
1da177e4 | 487 | |
c9180a57 EP |
488 | *mnt_opts_flags = kcalloc(*num_opts, sizeof(int), GFP_ATOMIC); |
489 | if (!*mnt_opts_flags) { | |
490 | rc = -ENOMEM; | |
491 | goto out_free; | |
492 | } | |
1da177e4 | 493 | |
c9180a57 EP |
494 | i = 0; |
495 | if (sbsec->flags & FSCONTEXT_MNT) { | |
496 | rc = security_sid_to_context(sbsec->sid, &context, &len); | |
497 | if (rc) | |
498 | goto out_free; | |
499 | (*mount_options)[i] = context; | |
500 | (*mnt_opts_flags)[i++] = FSCONTEXT_MNT; | |
501 | } | |
502 | if (sbsec->flags & CONTEXT_MNT) { | |
503 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); | |
504 | if (rc) | |
505 | goto out_free; | |
506 | (*mount_options)[i] = context; | |
507 | (*mnt_opts_flags)[i++] = CONTEXT_MNT; | |
508 | } | |
509 | if (sbsec->flags & DEFCONTEXT_MNT) { | |
510 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); | |
511 | if (rc) | |
512 | goto out_free; | |
513 | (*mount_options)[i] = context; | |
514 | (*mnt_opts_flags)[i++] = DEFCONTEXT_MNT; | |
515 | } | |
516 | if (sbsec->flags & ROOTCONTEXT_MNT) { | |
517 | struct inode *root = sbsec->sb->s_root->d_inode; | |
518 | struct inode_security_struct *isec = root->i_security; | |
0808925e | 519 | |
c9180a57 EP |
520 | rc = security_sid_to_context(isec->sid, &context, &len); |
521 | if (rc) | |
522 | goto out_free; | |
523 | (*mount_options)[i] = context; | |
524 | (*mnt_opts_flags)[i++] = ROOTCONTEXT_MNT; | |
525 | } | |
1da177e4 | 526 | |
c9180a57 | 527 | BUG_ON(i != *num_opts); |
1da177e4 | 528 | |
c9180a57 EP |
529 | return 0; |
530 | ||
531 | out_free: | |
532 | /* don't leak context string if security_sid_to_context had an error */ | |
533 | if (*mount_options && i) | |
534 | for (; i > 0; i--) | |
535 | kfree((*mount_options)[i-1]); | |
536 | kfree(*mount_options); | |
537 | *mount_options = NULL; | |
538 | kfree(*mnt_opts_flags); | |
539 | *mnt_opts_flags = NULL; | |
540 | *num_opts = 0; | |
541 | return rc; | |
542 | } | |
1da177e4 | 543 | |
c9180a57 EP |
544 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
545 | u32 old_sid, u32 new_sid) | |
546 | { | |
547 | /* check if the old mount command had the same options */ | |
548 | if (sbsec->initialized) | |
549 | if (!(sbsec->flags & flag) || | |
550 | (old_sid != new_sid)) | |
551 | return 1; | |
552 | ||
553 | /* check if we were passed the same options twice, | |
554 | * aka someone passed context=a,context=b | |
555 | */ | |
556 | if (!sbsec->initialized) | |
557 | if (sbsec->flags & flag) | |
558 | return 1; | |
559 | return 0; | |
560 | } | |
561 | /* | |
562 | * Allow filesystems with binary mount data to explicitly set mount point | |
563 | * labeling information. | |
564 | */ | |
565 | int selinux_set_mnt_opts(struct super_block *sb, char **mount_options, | |
566 | int *flags, int num_opts) | |
567 | { | |
568 | int rc = 0, i; | |
569 | struct task_security_struct *tsec = current->security; | |
570 | struct superblock_security_struct *sbsec = sb->s_security; | |
571 | const char *name = sb->s_type->name; | |
572 | struct inode *inode = sbsec->sb->s_root->d_inode; | |
573 | struct inode_security_struct *root_isec = inode->i_security; | |
574 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; | |
575 | u32 defcontext_sid = 0; | |
576 | ||
577 | mutex_lock(&sbsec->lock); | |
578 | ||
579 | if (!ss_initialized) { | |
580 | if (!num_opts) { | |
581 | /* Defer initialization until selinux_complete_init, | |
582 | after the initial policy is loaded and the security | |
583 | server is ready to handle calls. */ | |
584 | spin_lock(&sb_security_lock); | |
585 | if (list_empty(&sbsec->list)) | |
586 | list_add(&sbsec->list, &superblock_security_head); | |
587 | spin_unlock(&sb_security_lock); | |
588 | goto out; | |
589 | } | |
590 | rc = -EINVAL; | |
591 | printk(KERN_WARNING "Unable to set superblock options before " | |
592 | "the security server is initialized\n"); | |
1da177e4 | 593 | goto out; |
c9180a57 | 594 | } |
1da177e4 | 595 | |
c9180a57 EP |
596 | /* |
597 | * parse the mount options, check if they are valid sids. | |
598 | * also check if someone is trying to mount the same sb more | |
599 | * than once with different security options. | |
600 | */ | |
601 | for (i = 0; i < num_opts; i++) { | |
602 | u32 sid; | |
603 | rc = security_context_to_sid(mount_options[i], | |
604 | strlen(mount_options[i]), &sid); | |
1da177e4 LT |
605 | if (rc) { |
606 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
607 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
c9180a57 EP |
608 | mount_options[i], sb->s_id, name, rc); |
609 | goto out; | |
610 | } | |
611 | switch (flags[i]) { | |
612 | case FSCONTEXT_MNT: | |
613 | fscontext_sid = sid; | |
614 | ||
615 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
616 | fscontext_sid)) | |
617 | goto out_double_mount; | |
618 | ||
619 | sbsec->flags |= FSCONTEXT_MNT; | |
620 | break; | |
621 | case CONTEXT_MNT: | |
622 | context_sid = sid; | |
623 | ||
624 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
625 | context_sid)) | |
626 | goto out_double_mount; | |
627 | ||
628 | sbsec->flags |= CONTEXT_MNT; | |
629 | break; | |
630 | case ROOTCONTEXT_MNT: | |
631 | rootcontext_sid = sid; | |
632 | ||
633 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
634 | rootcontext_sid)) | |
635 | goto out_double_mount; | |
636 | ||
637 | sbsec->flags |= ROOTCONTEXT_MNT; | |
638 | ||
639 | break; | |
640 | case DEFCONTEXT_MNT: | |
641 | defcontext_sid = sid; | |
642 | ||
643 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
644 | defcontext_sid)) | |
645 | goto out_double_mount; | |
646 | ||
647 | sbsec->flags |= DEFCONTEXT_MNT; | |
648 | ||
649 | break; | |
650 | default: | |
651 | rc = -EINVAL; | |
652 | goto out; | |
1da177e4 | 653 | } |
c9180a57 EP |
654 | } |
655 | ||
656 | if (sbsec->initialized) { | |
657 | /* previously mounted with options, but not on this attempt? */ | |
658 | if (sbsec->flags && !num_opts) | |
659 | goto out_double_mount; | |
660 | rc = 0; | |
661 | goto out; | |
662 | } | |
663 | ||
664 | if (strcmp(sb->s_type->name, "proc") == 0) | |
665 | sbsec->proc = 1; | |
666 | ||
667 | /* Determine the labeling behavior to use for this filesystem type. */ | |
668 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); | |
669 | if (rc) { | |
670 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
671 | __FUNCTION__, sb->s_type->name, rc); | |
672 | goto out; | |
673 | } | |
1da177e4 | 674 | |
c9180a57 EP |
675 | /* sets the context of the superblock for the fs being mounted. */ |
676 | if (fscontext_sid) { | |
677 | ||
678 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); | |
1da177e4 | 679 | if (rc) |
c9180a57 | 680 | goto out; |
1da177e4 | 681 | |
c9180a57 | 682 | sbsec->sid = fscontext_sid; |
c312feb2 EP |
683 | } |
684 | ||
685 | /* | |
686 | * Switch to using mount point labeling behavior. | |
687 | * sets the label used on all file below the mountpoint, and will set | |
688 | * the superblock context if not already set. | |
689 | */ | |
c9180a57 EP |
690 | if (context_sid) { |
691 | if (!fscontext_sid) { | |
692 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); | |
b04ea3ce | 693 | if (rc) |
c9180a57 EP |
694 | goto out; |
695 | sbsec->sid = context_sid; | |
b04ea3ce | 696 | } else { |
c9180a57 | 697 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
b04ea3ce | 698 | if (rc) |
c9180a57 | 699 | goto out; |
b04ea3ce | 700 | } |
c9180a57 EP |
701 | if (!rootcontext_sid) |
702 | rootcontext_sid = context_sid; | |
1da177e4 | 703 | |
c9180a57 | 704 | sbsec->mntpoint_sid = context_sid; |
c312feb2 | 705 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
1da177e4 LT |
706 | } |
707 | ||
c9180a57 EP |
708 | if (rootcontext_sid) { |
709 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); | |
0808925e | 710 | if (rc) |
c9180a57 | 711 | goto out; |
0808925e | 712 | |
c9180a57 EP |
713 | root_isec->sid = rootcontext_sid; |
714 | root_isec->initialized = 1; | |
0808925e EP |
715 | } |
716 | ||
c9180a57 EP |
717 | if (defcontext_sid) { |
718 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
719 | rc = -EINVAL; | |
720 | printk(KERN_WARNING "SELinux: defcontext option is " | |
721 | "invalid for this filesystem type\n"); | |
722 | goto out; | |
1da177e4 LT |
723 | } |
724 | ||
c9180a57 EP |
725 | if (defcontext_sid != sbsec->def_sid) { |
726 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
727 | sbsec, tsec); | |
728 | if (rc) | |
729 | goto out; | |
730 | } | |
1da177e4 | 731 | |
c9180a57 | 732 | sbsec->def_sid = defcontext_sid; |
1da177e4 LT |
733 | } |
734 | ||
c9180a57 | 735 | rc = sb_finish_set_opts(sb); |
1da177e4 | 736 | out: |
c9180a57 | 737 | mutex_unlock(&sbsec->lock); |
1da177e4 | 738 | return rc; |
c9180a57 EP |
739 | out_double_mount: |
740 | rc = -EINVAL; | |
741 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
742 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
743 | goto out; | |
1da177e4 LT |
744 | } |
745 | ||
c9180a57 EP |
746 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
747 | struct super_block *newsb) | |
1da177e4 | 748 | { |
c9180a57 EP |
749 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
750 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
1da177e4 | 751 | |
c9180a57 EP |
752 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
753 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
754 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
1da177e4 | 755 | |
c9180a57 EP |
756 | /* we can't error, we can't save the info, this shouldn't get called |
757 | * this early in the boot process. */ | |
758 | BUG_ON(!ss_initialized); | |
759 | ||
760 | /* this might go away sometime down the line if there is a new user | |
761 | * of clone, but for now, nfs better not get here... */ | |
762 | BUG_ON(newsbsec->initialized); | |
763 | ||
764 | /* how can we clone if the old one wasn't set up?? */ | |
765 | BUG_ON(!oldsbsec->initialized); | |
766 | ||
767 | mutex_lock(&newsbsec->lock); | |
768 | ||
769 | newsbsec->flags = oldsbsec->flags; | |
770 | ||
771 | newsbsec->sid = oldsbsec->sid; | |
772 | newsbsec->def_sid = oldsbsec->def_sid; | |
773 | newsbsec->behavior = oldsbsec->behavior; | |
774 | ||
775 | if (set_context) { | |
776 | u32 sid = oldsbsec->mntpoint_sid; | |
777 | ||
778 | if (!set_fscontext) | |
779 | newsbsec->sid = sid; | |
780 | if (!set_rootcontext) { | |
781 | struct inode *newinode = newsb->s_root->d_inode; | |
782 | struct inode_security_struct *newisec = newinode->i_security; | |
783 | newisec->sid = sid; | |
784 | } | |
785 | newsbsec->mntpoint_sid = sid; | |
1da177e4 | 786 | } |
c9180a57 EP |
787 | if (set_rootcontext) { |
788 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
789 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
790 | struct inode *newinode = newsb->s_root->d_inode; | |
791 | struct inode_security_struct *newisec = newinode->i_security; | |
1da177e4 | 792 | |
c9180a57 | 793 | newisec->sid = oldisec->sid; |
1da177e4 LT |
794 | } |
795 | ||
c9180a57 EP |
796 | sb_finish_set_opts(newsb); |
797 | mutex_unlock(&newsbsec->lock); | |
798 | } | |
799 | ||
800 | /* | |
801 | * string mount options parsing and call set the sbsec | |
802 | */ | |
803 | static int superblock_doinit(struct super_block *sb, void *data) | |
804 | { | |
805 | char *context = NULL, *defcontext = NULL; | |
806 | char *fscontext = NULL, *rootcontext = NULL; | |
807 | int rc = 0; | |
808 | char *p, *options = data; | |
809 | /* selinux only know about a fixed number of mount options */ | |
810 | char *mnt_opts[NUM_SEL_MNT_OPTS]; | |
811 | int mnt_opts_flags[NUM_SEL_MNT_OPTS], num_mnt_opts = 0; | |
812 | ||
813 | if (!data) | |
1da177e4 LT |
814 | goto out; |
815 | ||
c9180a57 EP |
816 | /* with the nfs patch this will become a goto out; */ |
817 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) { | |
818 | const char *name = sb->s_type->name; | |
819 | /* NFS we understand. */ | |
820 | if (!strcmp(name, "nfs")) { | |
821 | struct nfs_mount_data *d = data; | |
822 | ||
823 | if (d->version != NFS_MOUNT_VERSION) | |
824 | goto out; | |
825 | ||
826 | if (d->context[0]) { | |
827 | context = kstrdup(d->context, GFP_KERNEL); | |
828 | if (!context) { | |
829 | rc = -ENOMEM; | |
830 | goto out; | |
831 | } | |
832 | } | |
833 | goto build_flags; | |
834 | } else | |
1da177e4 | 835 | goto out; |
1da177e4 LT |
836 | } |
837 | ||
c9180a57 EP |
838 | /* Standard string-based options. */ |
839 | while ((p = strsep(&options, "|")) != NULL) { | |
840 | int token; | |
841 | substring_t args[MAX_OPT_ARGS]; | |
1da177e4 | 842 | |
c9180a57 EP |
843 | if (!*p) |
844 | continue; | |
1da177e4 | 845 | |
c9180a57 | 846 | token = match_token(p, tokens, args); |
1da177e4 | 847 | |
c9180a57 EP |
848 | switch (token) { |
849 | case Opt_context: | |
850 | if (context || defcontext) { | |
851 | rc = -EINVAL; | |
852 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
853 | goto out_err; | |
854 | } | |
855 | context = match_strdup(&args[0]); | |
856 | if (!context) { | |
857 | rc = -ENOMEM; | |
858 | goto out_err; | |
859 | } | |
860 | break; | |
861 | ||
862 | case Opt_fscontext: | |
863 | if (fscontext) { | |
864 | rc = -EINVAL; | |
865 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
866 | goto out_err; | |
867 | } | |
868 | fscontext = match_strdup(&args[0]); | |
869 | if (!fscontext) { | |
870 | rc = -ENOMEM; | |
871 | goto out_err; | |
872 | } | |
873 | break; | |
874 | ||
875 | case Opt_rootcontext: | |
876 | if (rootcontext) { | |
877 | rc = -EINVAL; | |
878 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
879 | goto out_err; | |
880 | } | |
881 | rootcontext = match_strdup(&args[0]); | |
882 | if (!rootcontext) { | |
883 | rc = -ENOMEM; | |
884 | goto out_err; | |
885 | } | |
886 | break; | |
887 | ||
888 | case Opt_defcontext: | |
889 | if (context || defcontext) { | |
890 | rc = -EINVAL; | |
891 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
892 | goto out_err; | |
893 | } | |
894 | defcontext = match_strdup(&args[0]); | |
895 | if (!defcontext) { | |
896 | rc = -ENOMEM; | |
897 | goto out_err; | |
898 | } | |
899 | break; | |
900 | ||
901 | default: | |
902 | rc = -EINVAL; | |
903 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
904 | goto out_err; | |
1da177e4 | 905 | |
1da177e4 | 906 | } |
1da177e4 | 907 | } |
c9180a57 EP |
908 | |
909 | build_flags: | |
910 | if (fscontext) { | |
911 | mnt_opts[num_mnt_opts] = fscontext; | |
912 | mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
913 | } | |
914 | if (context) { | |
915 | mnt_opts[num_mnt_opts] = context; | |
916 | mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
917 | } | |
918 | if (rootcontext) { | |
919 | mnt_opts[num_mnt_opts] = rootcontext; | |
920 | mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
921 | } | |
922 | if (defcontext) { | |
923 | mnt_opts[num_mnt_opts] = defcontext; | |
924 | mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
925 | } | |
926 | ||
1da177e4 | 927 | out: |
c9180a57 EP |
928 | rc = selinux_set_mnt_opts(sb, mnt_opts, mnt_opts_flags, num_mnt_opts); |
929 | out_err: | |
930 | kfree(context); | |
931 | kfree(defcontext); | |
932 | kfree(fscontext); | |
933 | kfree(rootcontext); | |
1da177e4 LT |
934 | return rc; |
935 | } | |
936 | ||
937 | static inline u16 inode_mode_to_security_class(umode_t mode) | |
938 | { | |
939 | switch (mode & S_IFMT) { | |
940 | case S_IFSOCK: | |
941 | return SECCLASS_SOCK_FILE; | |
942 | case S_IFLNK: | |
943 | return SECCLASS_LNK_FILE; | |
944 | case S_IFREG: | |
945 | return SECCLASS_FILE; | |
946 | case S_IFBLK: | |
947 | return SECCLASS_BLK_FILE; | |
948 | case S_IFDIR: | |
949 | return SECCLASS_DIR; | |
950 | case S_IFCHR: | |
951 | return SECCLASS_CHR_FILE; | |
952 | case S_IFIFO: | |
953 | return SECCLASS_FIFO_FILE; | |
954 | ||
955 | } | |
956 | ||
957 | return SECCLASS_FILE; | |
958 | } | |
959 | ||
13402580 JM |
960 | static inline int default_protocol_stream(int protocol) |
961 | { | |
962 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
963 | } | |
964 | ||
965 | static inline int default_protocol_dgram(int protocol) | |
966 | { | |
967 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
968 | } | |
969 | ||
1da177e4 LT |
970 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
971 | { | |
972 | switch (family) { | |
973 | case PF_UNIX: | |
974 | switch (type) { | |
975 | case SOCK_STREAM: | |
976 | case SOCK_SEQPACKET: | |
977 | return SECCLASS_UNIX_STREAM_SOCKET; | |
978 | case SOCK_DGRAM: | |
979 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
980 | } | |
981 | break; | |
982 | case PF_INET: | |
983 | case PF_INET6: | |
984 | switch (type) { | |
985 | case SOCK_STREAM: | |
13402580 JM |
986 | if (default_protocol_stream(protocol)) |
987 | return SECCLASS_TCP_SOCKET; | |
988 | else | |
989 | return SECCLASS_RAWIP_SOCKET; | |
1da177e4 | 990 | case SOCK_DGRAM: |
13402580 JM |
991 | if (default_protocol_dgram(protocol)) |
992 | return SECCLASS_UDP_SOCKET; | |
993 | else | |
994 | return SECCLASS_RAWIP_SOCKET; | |
2ee92d46 JM |
995 | case SOCK_DCCP: |
996 | return SECCLASS_DCCP_SOCKET; | |
13402580 | 997 | default: |
1da177e4 LT |
998 | return SECCLASS_RAWIP_SOCKET; |
999 | } | |
1000 | break; | |
1001 | case PF_NETLINK: | |
1002 | switch (protocol) { | |
1003 | case NETLINK_ROUTE: | |
1004 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1005 | case NETLINK_FIREWALL: | |
1006 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
216efaaa | 1007 | case NETLINK_INET_DIAG: |
1da177e4 LT |
1008 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
1009 | case NETLINK_NFLOG: | |
1010 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1011 | case NETLINK_XFRM: | |
1012 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1013 | case NETLINK_SELINUX: | |
1014 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1015 | case NETLINK_AUDIT: | |
1016 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1017 | case NETLINK_IP6_FW: | |
1018 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1019 | case NETLINK_DNRTMSG: | |
1020 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
0c9b7942 JM |
1021 | case NETLINK_KOBJECT_UEVENT: |
1022 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1da177e4 LT |
1023 | default: |
1024 | return SECCLASS_NETLINK_SOCKET; | |
1025 | } | |
1026 | case PF_PACKET: | |
1027 | return SECCLASS_PACKET_SOCKET; | |
1028 | case PF_KEY: | |
1029 | return SECCLASS_KEY_SOCKET; | |
3e3ff15e CP |
1030 | case PF_APPLETALK: |
1031 | return SECCLASS_APPLETALK_SOCKET; | |
1da177e4 LT |
1032 | } |
1033 | ||
1034 | return SECCLASS_SOCKET; | |
1035 | } | |
1036 | ||
1037 | #ifdef CONFIG_PROC_FS | |
1038 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1039 | u16 tclass, | |
1040 | u32 *sid) | |
1041 | { | |
1042 | int buflen, rc; | |
1043 | char *buffer, *path, *end; | |
1044 | ||
1045 | buffer = (char*)__get_free_page(GFP_KERNEL); | |
1046 | if (!buffer) | |
1047 | return -ENOMEM; | |
1048 | ||
1049 | buflen = PAGE_SIZE; | |
1050 | end = buffer+buflen; | |
1051 | *--end = '\0'; | |
1052 | buflen--; | |
1053 | path = end-1; | |
1054 | *path = '/'; | |
1055 | while (de && de != de->parent) { | |
1056 | buflen -= de->namelen + 1; | |
1057 | if (buflen < 0) | |
1058 | break; | |
1059 | end -= de->namelen; | |
1060 | memcpy(end, de->name, de->namelen); | |
1061 | *--end = '/'; | |
1062 | path = end; | |
1063 | de = de->parent; | |
1064 | } | |
1065 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1066 | free_page((unsigned long)buffer); | |
1067 | return rc; | |
1068 | } | |
1069 | #else | |
1070 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1071 | u16 tclass, | |
1072 | u32 *sid) | |
1073 | { | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | #endif | |
1077 | ||
1078 | /* The inode's security attributes must be initialized before first use. */ | |
1079 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1080 | { | |
1081 | struct superblock_security_struct *sbsec = NULL; | |
1082 | struct inode_security_struct *isec = inode->i_security; | |
1083 | u32 sid; | |
1084 | struct dentry *dentry; | |
1085 | #define INITCONTEXTLEN 255 | |
1086 | char *context = NULL; | |
1087 | unsigned len = 0; | |
1088 | int rc = 0; | |
1da177e4 LT |
1089 | |
1090 | if (isec->initialized) | |
1091 | goto out; | |
1092 | ||
23970741 | 1093 | mutex_lock(&isec->lock); |
1da177e4 | 1094 | if (isec->initialized) |
23970741 | 1095 | goto out_unlock; |
1da177e4 LT |
1096 | |
1097 | sbsec = inode->i_sb->s_security; | |
1098 | if (!sbsec->initialized) { | |
1099 | /* Defer initialization until selinux_complete_init, | |
1100 | after the initial policy is loaded and the security | |
1101 | server is ready to handle calls. */ | |
1102 | spin_lock(&sbsec->isec_lock); | |
1103 | if (list_empty(&isec->list)) | |
1104 | list_add(&isec->list, &sbsec->isec_head); | |
1105 | spin_unlock(&sbsec->isec_lock); | |
23970741 | 1106 | goto out_unlock; |
1da177e4 LT |
1107 | } |
1108 | ||
1109 | switch (sbsec->behavior) { | |
1110 | case SECURITY_FS_USE_XATTR: | |
1111 | if (!inode->i_op->getxattr) { | |
1112 | isec->sid = sbsec->def_sid; | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | /* Need a dentry, since the xattr API requires one. | |
1117 | Life would be simpler if we could just pass the inode. */ | |
1118 | if (opt_dentry) { | |
1119 | /* Called from d_instantiate or d_splice_alias. */ | |
1120 | dentry = dget(opt_dentry); | |
1121 | } else { | |
1122 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1123 | dentry = d_find_alias(inode); | |
1124 | } | |
1125 | if (!dentry) { | |
1126 | printk(KERN_WARNING "%s: no dentry for dev=%s " | |
1127 | "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id, | |
1128 | inode->i_ino); | |
23970741 | 1129 | goto out_unlock; |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | len = INITCONTEXTLEN; | |
1133 | context = kmalloc(len, GFP_KERNEL); | |
1134 | if (!context) { | |
1135 | rc = -ENOMEM; | |
1136 | dput(dentry); | |
23970741 | 1137 | goto out_unlock; |
1da177e4 LT |
1138 | } |
1139 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1140 | context, len); | |
1141 | if (rc == -ERANGE) { | |
1142 | /* Need a larger buffer. Query for the right size. */ | |
1143 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1144 | NULL, 0); | |
1145 | if (rc < 0) { | |
1146 | dput(dentry); | |
23970741 | 1147 | goto out_unlock; |
1da177e4 LT |
1148 | } |
1149 | kfree(context); | |
1150 | len = rc; | |
1151 | context = kmalloc(len, GFP_KERNEL); | |
1152 | if (!context) { | |
1153 | rc = -ENOMEM; | |
1154 | dput(dentry); | |
23970741 | 1155 | goto out_unlock; |
1da177e4 LT |
1156 | } |
1157 | rc = inode->i_op->getxattr(dentry, | |
1158 | XATTR_NAME_SELINUX, | |
1159 | context, len); | |
1160 | } | |
1161 | dput(dentry); | |
1162 | if (rc < 0) { | |
1163 | if (rc != -ENODATA) { | |
1164 | printk(KERN_WARNING "%s: getxattr returned " | |
1165 | "%d for dev=%s ino=%ld\n", __FUNCTION__, | |
1166 | -rc, inode->i_sb->s_id, inode->i_ino); | |
1167 | kfree(context); | |
23970741 | 1168 | goto out_unlock; |
1da177e4 LT |
1169 | } |
1170 | /* Map ENODATA to the default file SID */ | |
1171 | sid = sbsec->def_sid; | |
1172 | rc = 0; | |
1173 | } else { | |
f5c1d5b2 JM |
1174 | rc = security_context_to_sid_default(context, rc, &sid, |
1175 | sbsec->def_sid); | |
1da177e4 LT |
1176 | if (rc) { |
1177 | printk(KERN_WARNING "%s: context_to_sid(%s) " | |
1178 | "returned %d for dev=%s ino=%ld\n", | |
1179 | __FUNCTION__, context, -rc, | |
1180 | inode->i_sb->s_id, inode->i_ino); | |
1181 | kfree(context); | |
1182 | /* Leave with the unlabeled SID */ | |
1183 | rc = 0; | |
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | kfree(context); | |
1188 | isec->sid = sid; | |
1189 | break; | |
1190 | case SECURITY_FS_USE_TASK: | |
1191 | isec->sid = isec->task_sid; | |
1192 | break; | |
1193 | case SECURITY_FS_USE_TRANS: | |
1194 | /* Default to the fs SID. */ | |
1195 | isec->sid = sbsec->sid; | |
1196 | ||
1197 | /* Try to obtain a transition SID. */ | |
1198 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1199 | rc = security_transition_sid(isec->task_sid, | |
1200 | sbsec->sid, | |
1201 | isec->sclass, | |
1202 | &sid); | |
1203 | if (rc) | |
23970741 | 1204 | goto out_unlock; |
1da177e4 LT |
1205 | isec->sid = sid; |
1206 | break; | |
c312feb2 EP |
1207 | case SECURITY_FS_USE_MNTPOINT: |
1208 | isec->sid = sbsec->mntpoint_sid; | |
1209 | break; | |
1da177e4 | 1210 | default: |
c312feb2 | 1211 | /* Default to the fs superblock SID. */ |
1da177e4 LT |
1212 | isec->sid = sbsec->sid; |
1213 | ||
1214 | if (sbsec->proc) { | |
1215 | struct proc_inode *proci = PROC_I(inode); | |
1216 | if (proci->pde) { | |
1217 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1218 | rc = selinux_proc_get_sid(proci->pde, | |
1219 | isec->sclass, | |
1220 | &sid); | |
1221 | if (rc) | |
23970741 | 1222 | goto out_unlock; |
1da177e4 LT |
1223 | isec->sid = sid; |
1224 | } | |
1225 | } | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | isec->initialized = 1; | |
1230 | ||
23970741 EP |
1231 | out_unlock: |
1232 | mutex_unlock(&isec->lock); | |
1da177e4 LT |
1233 | out: |
1234 | if (isec->sclass == SECCLASS_FILE) | |
1235 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1da177e4 LT |
1236 | return rc; |
1237 | } | |
1238 | ||
1239 | /* Convert a Linux signal to an access vector. */ | |
1240 | static inline u32 signal_to_av(int sig) | |
1241 | { | |
1242 | u32 perm = 0; | |
1243 | ||
1244 | switch (sig) { | |
1245 | case SIGCHLD: | |
1246 | /* Commonly granted from child to parent. */ | |
1247 | perm = PROCESS__SIGCHLD; | |
1248 | break; | |
1249 | case SIGKILL: | |
1250 | /* Cannot be caught or ignored */ | |
1251 | perm = PROCESS__SIGKILL; | |
1252 | break; | |
1253 | case SIGSTOP: | |
1254 | /* Cannot be caught or ignored */ | |
1255 | perm = PROCESS__SIGSTOP; | |
1256 | break; | |
1257 | default: | |
1258 | /* All other signals. */ | |
1259 | perm = PROCESS__SIGNAL; | |
1260 | break; | |
1261 | } | |
1262 | ||
1263 | return perm; | |
1264 | } | |
1265 | ||
1266 | /* Check permission betweeen a pair of tasks, e.g. signal checks, | |
1267 | fork check, ptrace check, etc. */ | |
1268 | static int task_has_perm(struct task_struct *tsk1, | |
1269 | struct task_struct *tsk2, | |
1270 | u32 perms) | |
1271 | { | |
1272 | struct task_security_struct *tsec1, *tsec2; | |
1273 | ||
1274 | tsec1 = tsk1->security; | |
1275 | tsec2 = tsk2->security; | |
1276 | return avc_has_perm(tsec1->sid, tsec2->sid, | |
1277 | SECCLASS_PROCESS, perms, NULL); | |
1278 | } | |
1279 | ||
1280 | /* Check whether a task is allowed to use a capability. */ | |
1281 | static int task_has_capability(struct task_struct *tsk, | |
1282 | int cap) | |
1283 | { | |
1284 | struct task_security_struct *tsec; | |
1285 | struct avc_audit_data ad; | |
1286 | ||
1287 | tsec = tsk->security; | |
1288 | ||
1289 | AVC_AUDIT_DATA_INIT(&ad,CAP); | |
1290 | ad.tsk = tsk; | |
1291 | ad.u.cap = cap; | |
1292 | ||
1293 | return avc_has_perm(tsec->sid, tsec->sid, | |
1294 | SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad); | |
1295 | } | |
1296 | ||
1297 | /* Check whether a task is allowed to use a system operation. */ | |
1298 | static int task_has_system(struct task_struct *tsk, | |
1299 | u32 perms) | |
1300 | { | |
1301 | struct task_security_struct *tsec; | |
1302 | ||
1303 | tsec = tsk->security; | |
1304 | ||
1305 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, | |
1306 | SECCLASS_SYSTEM, perms, NULL); | |
1307 | } | |
1308 | ||
1309 | /* Check whether a task has a particular permission to an inode. | |
1310 | The 'adp' parameter is optional and allows other audit | |
1311 | data to be passed (e.g. the dentry). */ | |
1312 | static int inode_has_perm(struct task_struct *tsk, | |
1313 | struct inode *inode, | |
1314 | u32 perms, | |
1315 | struct avc_audit_data *adp) | |
1316 | { | |
1317 | struct task_security_struct *tsec; | |
1318 | struct inode_security_struct *isec; | |
1319 | struct avc_audit_data ad; | |
1320 | ||
bbaca6c2 SS |
1321 | if (unlikely (IS_PRIVATE (inode))) |
1322 | return 0; | |
1323 | ||
1da177e4 LT |
1324 | tsec = tsk->security; |
1325 | isec = inode->i_security; | |
1326 | ||
1327 | if (!adp) { | |
1328 | adp = &ad; | |
1329 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1330 | ad.u.fs.inode = inode; | |
1331 | } | |
1332 | ||
1333 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); | |
1334 | } | |
1335 | ||
1336 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1337 | the dentry to help the auditing code to more easily generate the | |
1338 | pathname if needed. */ | |
1339 | static inline int dentry_has_perm(struct task_struct *tsk, | |
1340 | struct vfsmount *mnt, | |
1341 | struct dentry *dentry, | |
1342 | u32 av) | |
1343 | { | |
1344 | struct inode *inode = dentry->d_inode; | |
1345 | struct avc_audit_data ad; | |
1346 | AVC_AUDIT_DATA_INIT(&ad,FS); | |
1347 | ad.u.fs.mnt = mnt; | |
1348 | ad.u.fs.dentry = dentry; | |
1349 | return inode_has_perm(tsk, inode, av, &ad); | |
1350 | } | |
1351 | ||
1352 | /* Check whether a task can use an open file descriptor to | |
1353 | access an inode in a given way. Check access to the | |
1354 | descriptor itself, and then use dentry_has_perm to | |
1355 | check a particular permission to the file. | |
1356 | Access to the descriptor is implicitly granted if it | |
1357 | has the same SID as the process. If av is zero, then | |
1358 | access to the file is not checked, e.g. for cases | |
1359 | where only the descriptor is affected like seek. */ | |
858119e1 | 1360 | static int file_has_perm(struct task_struct *tsk, |
1da177e4 LT |
1361 | struct file *file, |
1362 | u32 av) | |
1363 | { | |
1364 | struct task_security_struct *tsec = tsk->security; | |
1365 | struct file_security_struct *fsec = file->f_security; | |
3d5ff529 JS |
1366 | struct vfsmount *mnt = file->f_path.mnt; |
1367 | struct dentry *dentry = file->f_path.dentry; | |
1da177e4 LT |
1368 | struct inode *inode = dentry->d_inode; |
1369 | struct avc_audit_data ad; | |
1370 | int rc; | |
1371 | ||
1372 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1373 | ad.u.fs.mnt = mnt; | |
1374 | ad.u.fs.dentry = dentry; | |
1375 | ||
1376 | if (tsec->sid != fsec->sid) { | |
1377 | rc = avc_has_perm(tsec->sid, fsec->sid, | |
1378 | SECCLASS_FD, | |
1379 | FD__USE, | |
1380 | &ad); | |
1381 | if (rc) | |
1382 | return rc; | |
1383 | } | |
1384 | ||
1385 | /* av is zero if only checking access to the descriptor. */ | |
1386 | if (av) | |
1387 | return inode_has_perm(tsk, inode, av, &ad); | |
1388 | ||
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | /* Check whether a task can create a file. */ | |
1393 | static int may_create(struct inode *dir, | |
1394 | struct dentry *dentry, | |
1395 | u16 tclass) | |
1396 | { | |
1397 | struct task_security_struct *tsec; | |
1398 | struct inode_security_struct *dsec; | |
1399 | struct superblock_security_struct *sbsec; | |
1400 | u32 newsid; | |
1401 | struct avc_audit_data ad; | |
1402 | int rc; | |
1403 | ||
1404 | tsec = current->security; | |
1405 | dsec = dir->i_security; | |
1406 | sbsec = dir->i_sb->s_security; | |
1407 | ||
1408 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1409 | ad.u.fs.dentry = dentry; | |
1410 | ||
1411 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, | |
1412 | DIR__ADD_NAME | DIR__SEARCH, | |
1413 | &ad); | |
1414 | if (rc) | |
1415 | return rc; | |
1416 | ||
1417 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
1418 | newsid = tsec->create_sid; | |
1419 | } else { | |
1420 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, | |
1421 | &newsid); | |
1422 | if (rc) | |
1423 | return rc; | |
1424 | } | |
1425 | ||
1426 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); | |
1427 | if (rc) | |
1428 | return rc; | |
1429 | ||
1430 | return avc_has_perm(newsid, sbsec->sid, | |
1431 | SECCLASS_FILESYSTEM, | |
1432 | FILESYSTEM__ASSOCIATE, &ad); | |
1433 | } | |
1434 | ||
4eb582cf ML |
1435 | /* Check whether a task can create a key. */ |
1436 | static int may_create_key(u32 ksid, | |
1437 | struct task_struct *ctx) | |
1438 | { | |
1439 | struct task_security_struct *tsec; | |
1440 | ||
1441 | tsec = ctx->security; | |
1442 | ||
1443 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); | |
1444 | } | |
1445 | ||
1da177e4 LT |
1446 | #define MAY_LINK 0 |
1447 | #define MAY_UNLINK 1 | |
1448 | #define MAY_RMDIR 2 | |
1449 | ||
1450 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1451 | static int may_link(struct inode *dir, | |
1452 | struct dentry *dentry, | |
1453 | int kind) | |
1454 | ||
1455 | { | |
1456 | struct task_security_struct *tsec; | |
1457 | struct inode_security_struct *dsec, *isec; | |
1458 | struct avc_audit_data ad; | |
1459 | u32 av; | |
1460 | int rc; | |
1461 | ||
1462 | tsec = current->security; | |
1463 | dsec = dir->i_security; | |
1464 | isec = dentry->d_inode->i_security; | |
1465 | ||
1466 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1467 | ad.u.fs.dentry = dentry; | |
1468 | ||
1469 | av = DIR__SEARCH; | |
1470 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
1471 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); | |
1472 | if (rc) | |
1473 | return rc; | |
1474 | ||
1475 | switch (kind) { | |
1476 | case MAY_LINK: | |
1477 | av = FILE__LINK; | |
1478 | break; | |
1479 | case MAY_UNLINK: | |
1480 | av = FILE__UNLINK; | |
1481 | break; | |
1482 | case MAY_RMDIR: | |
1483 | av = DIR__RMDIR; | |
1484 | break; | |
1485 | default: | |
1486 | printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind); | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); | |
1491 | return rc; | |
1492 | } | |
1493 | ||
1494 | static inline int may_rename(struct inode *old_dir, | |
1495 | struct dentry *old_dentry, | |
1496 | struct inode *new_dir, | |
1497 | struct dentry *new_dentry) | |
1498 | { | |
1499 | struct task_security_struct *tsec; | |
1500 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; | |
1501 | struct avc_audit_data ad; | |
1502 | u32 av; | |
1503 | int old_is_dir, new_is_dir; | |
1504 | int rc; | |
1505 | ||
1506 | tsec = current->security; | |
1507 | old_dsec = old_dir->i_security; | |
1508 | old_isec = old_dentry->d_inode->i_security; | |
1509 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1510 | new_dsec = new_dir->i_security; | |
1511 | ||
1512 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1513 | ||
1514 | ad.u.fs.dentry = old_dentry; | |
1515 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, | |
1516 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); | |
1517 | if (rc) | |
1518 | return rc; | |
1519 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1520 | old_isec->sclass, FILE__RENAME, &ad); | |
1521 | if (rc) | |
1522 | return rc; | |
1523 | if (old_is_dir && new_dir != old_dir) { | |
1524 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1525 | old_isec->sclass, DIR__REPARENT, &ad); | |
1526 | if (rc) | |
1527 | return rc; | |
1528 | } | |
1529 | ||
1530 | ad.u.fs.dentry = new_dentry; | |
1531 | av = DIR__ADD_NAME | DIR__SEARCH; | |
1532 | if (new_dentry->d_inode) | |
1533 | av |= DIR__REMOVE_NAME; | |
1534 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); | |
1535 | if (rc) | |
1536 | return rc; | |
1537 | if (new_dentry->d_inode) { | |
1538 | new_isec = new_dentry->d_inode->i_security; | |
1539 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
1540 | rc = avc_has_perm(tsec->sid, new_isec->sid, | |
1541 | new_isec->sclass, | |
1542 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1543 | if (rc) | |
1544 | return rc; | |
1545 | } | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | /* Check whether a task can perform a filesystem operation. */ | |
1551 | static int superblock_has_perm(struct task_struct *tsk, | |
1552 | struct super_block *sb, | |
1553 | u32 perms, | |
1554 | struct avc_audit_data *ad) | |
1555 | { | |
1556 | struct task_security_struct *tsec; | |
1557 | struct superblock_security_struct *sbsec; | |
1558 | ||
1559 | tsec = tsk->security; | |
1560 | sbsec = sb->s_security; | |
1561 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
1562 | perms, ad); | |
1563 | } | |
1564 | ||
1565 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1566 | static inline u32 file_mask_to_av(int mode, int mask) | |
1567 | { | |
1568 | u32 av = 0; | |
1569 | ||
1570 | if ((mode & S_IFMT) != S_IFDIR) { | |
1571 | if (mask & MAY_EXEC) | |
1572 | av |= FILE__EXECUTE; | |
1573 | if (mask & MAY_READ) | |
1574 | av |= FILE__READ; | |
1575 | ||
1576 | if (mask & MAY_APPEND) | |
1577 | av |= FILE__APPEND; | |
1578 | else if (mask & MAY_WRITE) | |
1579 | av |= FILE__WRITE; | |
1580 | ||
1581 | } else { | |
1582 | if (mask & MAY_EXEC) | |
1583 | av |= DIR__SEARCH; | |
1584 | if (mask & MAY_WRITE) | |
1585 | av |= DIR__WRITE; | |
1586 | if (mask & MAY_READ) | |
1587 | av |= DIR__READ; | |
1588 | } | |
1589 | ||
1590 | return av; | |
1591 | } | |
1592 | ||
1593 | /* Convert a Linux file to an access vector. */ | |
1594 | static inline u32 file_to_av(struct file *file) | |
1595 | { | |
1596 | u32 av = 0; | |
1597 | ||
1598 | if (file->f_mode & FMODE_READ) | |
1599 | av |= FILE__READ; | |
1600 | if (file->f_mode & FMODE_WRITE) { | |
1601 | if (file->f_flags & O_APPEND) | |
1602 | av |= FILE__APPEND; | |
1603 | else | |
1604 | av |= FILE__WRITE; | |
1605 | } | |
1606 | ||
1607 | return av; | |
1608 | } | |
1609 | ||
1da177e4 LT |
1610 | /* Hook functions begin here. */ |
1611 | ||
1612 | static int selinux_ptrace(struct task_struct *parent, struct task_struct *child) | |
1613 | { | |
1614 | struct task_security_struct *psec = parent->security; | |
1615 | struct task_security_struct *csec = child->security; | |
1616 | int rc; | |
1617 | ||
1618 | rc = secondary_ops->ptrace(parent,child); | |
1619 | if (rc) | |
1620 | return rc; | |
1621 | ||
1622 | rc = task_has_perm(parent, child, PROCESS__PTRACE); | |
1623 | /* Save the SID of the tracing process for later use in apply_creds. */ | |
341c2d80 | 1624 | if (!(child->ptrace & PT_PTRACED) && !rc) |
1da177e4 LT |
1625 | csec->ptrace_sid = psec->sid; |
1626 | return rc; | |
1627 | } | |
1628 | ||
1629 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
1630 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
1631 | { | |
1632 | int error; | |
1633 | ||
1634 | error = task_has_perm(current, target, PROCESS__GETCAP); | |
1635 | if (error) | |
1636 | return error; | |
1637 | ||
1638 | return secondary_ops->capget(target, effective, inheritable, permitted); | |
1639 | } | |
1640 | ||
1641 | static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, | |
1642 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
1643 | { | |
1644 | int error; | |
1645 | ||
1646 | error = secondary_ops->capset_check(target, effective, inheritable, permitted); | |
1647 | if (error) | |
1648 | return error; | |
1649 | ||
1650 | return task_has_perm(current, target, PROCESS__SETCAP); | |
1651 | } | |
1652 | ||
1653 | static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, | |
1654 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
1655 | { | |
1656 | secondary_ops->capset_set(target, effective, inheritable, permitted); | |
1657 | } | |
1658 | ||
1659 | static int selinux_capable(struct task_struct *tsk, int cap) | |
1660 | { | |
1661 | int rc; | |
1662 | ||
1663 | rc = secondary_ops->capable(tsk, cap); | |
1664 | if (rc) | |
1665 | return rc; | |
1666 | ||
1667 | return task_has_capability(tsk,cap); | |
1668 | } | |
1669 | ||
3fbfa981 EB |
1670 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
1671 | { | |
1672 | int buflen, rc; | |
1673 | char *buffer, *path, *end; | |
1674 | ||
1675 | rc = -ENOMEM; | |
1676 | buffer = (char*)__get_free_page(GFP_KERNEL); | |
1677 | if (!buffer) | |
1678 | goto out; | |
1679 | ||
1680 | buflen = PAGE_SIZE; | |
1681 | end = buffer+buflen; | |
1682 | *--end = '\0'; | |
1683 | buflen--; | |
1684 | path = end-1; | |
1685 | *path = '/'; | |
1686 | while (table) { | |
1687 | const char *name = table->procname; | |
1688 | size_t namelen = strlen(name); | |
1689 | buflen -= namelen + 1; | |
1690 | if (buflen < 0) | |
1691 | goto out_free; | |
1692 | end -= namelen; | |
1693 | memcpy(end, name, namelen); | |
1694 | *--end = '/'; | |
1695 | path = end; | |
1696 | table = table->parent; | |
1697 | } | |
b599fdfd EB |
1698 | buflen -= 4; |
1699 | if (buflen < 0) | |
1700 | goto out_free; | |
1701 | end -= 4; | |
1702 | memcpy(end, "/sys", 4); | |
1703 | path = end; | |
3fbfa981 EB |
1704 | rc = security_genfs_sid("proc", path, tclass, sid); |
1705 | out_free: | |
1706 | free_page((unsigned long)buffer); | |
1707 | out: | |
1708 | return rc; | |
1709 | } | |
1710 | ||
1da177e4 LT |
1711 | static int selinux_sysctl(ctl_table *table, int op) |
1712 | { | |
1713 | int error = 0; | |
1714 | u32 av; | |
1715 | struct task_security_struct *tsec; | |
1716 | u32 tsid; | |
1717 | int rc; | |
1718 | ||
1719 | rc = secondary_ops->sysctl(table, op); | |
1720 | if (rc) | |
1721 | return rc; | |
1722 | ||
1723 | tsec = current->security; | |
1724 | ||
3fbfa981 EB |
1725 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
1726 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1da177e4 LT |
1727 | if (rc) { |
1728 | /* Default to the well-defined sysctl SID. */ | |
1729 | tsid = SECINITSID_SYSCTL; | |
1730 | } | |
1731 | ||
1732 | /* The op values are "defined" in sysctl.c, thereby creating | |
1733 | * a bad coupling between this module and sysctl.c */ | |
1734 | if(op == 001) { | |
1735 | error = avc_has_perm(tsec->sid, tsid, | |
1736 | SECCLASS_DIR, DIR__SEARCH, NULL); | |
1737 | } else { | |
1738 | av = 0; | |
1739 | if (op & 004) | |
1740 | av |= FILE__READ; | |
1741 | if (op & 002) | |
1742 | av |= FILE__WRITE; | |
1743 | if (av) | |
1744 | error = avc_has_perm(tsec->sid, tsid, | |
1745 | SECCLASS_FILE, av, NULL); | |
1746 | } | |
1747 | ||
1748 | return error; | |
1749 | } | |
1750 | ||
1751 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1752 | { | |
1753 | int rc = 0; | |
1754 | ||
1755 | if (!sb) | |
1756 | return 0; | |
1757 | ||
1758 | switch (cmds) { | |
1759 | case Q_SYNC: | |
1760 | case Q_QUOTAON: | |
1761 | case Q_QUOTAOFF: | |
1762 | case Q_SETINFO: | |
1763 | case Q_SETQUOTA: | |
1764 | rc = superblock_has_perm(current, | |
1765 | sb, | |
1766 | FILESYSTEM__QUOTAMOD, NULL); | |
1767 | break; | |
1768 | case Q_GETFMT: | |
1769 | case Q_GETINFO: | |
1770 | case Q_GETQUOTA: | |
1771 | rc = superblock_has_perm(current, | |
1772 | sb, | |
1773 | FILESYSTEM__QUOTAGET, NULL); | |
1774 | break; | |
1775 | default: | |
1776 | rc = 0; /* let the kernel handle invalid cmds */ | |
1777 | break; | |
1778 | } | |
1779 | return rc; | |
1780 | } | |
1781 | ||
1782 | static int selinux_quota_on(struct dentry *dentry) | |
1783 | { | |
1784 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); | |
1785 | } | |
1786 | ||
1787 | static int selinux_syslog(int type) | |
1788 | { | |
1789 | int rc; | |
1790 | ||
1791 | rc = secondary_ops->syslog(type); | |
1792 | if (rc) | |
1793 | return rc; | |
1794 | ||
1795 | switch (type) { | |
1796 | case 3: /* Read last kernel messages */ | |
1797 | case 10: /* Return size of the log buffer */ | |
1798 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
1799 | break; | |
1800 | case 6: /* Disable logging to console */ | |
1801 | case 7: /* Enable logging to console */ | |
1802 | case 8: /* Set level of messages printed to console */ | |
1803 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
1804 | break; | |
1805 | case 0: /* Close log */ | |
1806 | case 1: /* Open log */ | |
1807 | case 2: /* Read from log */ | |
1808 | case 4: /* Read/clear last kernel messages */ | |
1809 | case 5: /* Clear ring buffer */ | |
1810 | default: | |
1811 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
1812 | break; | |
1813 | } | |
1814 | return rc; | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Check that a process has enough memory to allocate a new virtual | |
1819 | * mapping. 0 means there is enough memory for the allocation to | |
1820 | * succeed and -ENOMEM implies there is not. | |
1821 | * | |
1822 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 | |
1823 | * if the capability is granted, but __vm_enough_memory requires 1 if | |
1824 | * the capability is granted. | |
1825 | * | |
1826 | * Do not audit the selinux permission check, as this is applied to all | |
1827 | * processes that allocate mappings. | |
1828 | */ | |
34b4e4aa | 1829 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
1da177e4 LT |
1830 | { |
1831 | int rc, cap_sys_admin = 0; | |
1832 | struct task_security_struct *tsec = current->security; | |
1833 | ||
1834 | rc = secondary_ops->capable(current, CAP_SYS_ADMIN); | |
1835 | if (rc == 0) | |
1836 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, | |
2c3c05db SS |
1837 | SECCLASS_CAPABILITY, |
1838 | CAP_TO_MASK(CAP_SYS_ADMIN), | |
1839 | 0, | |
1840 | NULL); | |
1da177e4 LT |
1841 | |
1842 | if (rc == 0) | |
1843 | cap_sys_admin = 1; | |
1844 | ||
34b4e4aa | 1845 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
1da177e4 LT |
1846 | } |
1847 | ||
1848 | /* binprm security operations */ | |
1849 | ||
1850 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) | |
1851 | { | |
1852 | struct bprm_security_struct *bsec; | |
1853 | ||
89d155ef | 1854 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
1da177e4 LT |
1855 | if (!bsec) |
1856 | return -ENOMEM; | |
1857 | ||
1da177e4 LT |
1858 | bsec->bprm = bprm; |
1859 | bsec->sid = SECINITSID_UNLABELED; | |
1860 | bsec->set = 0; | |
1861 | ||
1862 | bprm->security = bsec; | |
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | static int selinux_bprm_set_security(struct linux_binprm *bprm) | |
1867 | { | |
1868 | struct task_security_struct *tsec; | |
3d5ff529 | 1869 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
1870 | struct inode_security_struct *isec; |
1871 | struct bprm_security_struct *bsec; | |
1872 | u32 newsid; | |
1873 | struct avc_audit_data ad; | |
1874 | int rc; | |
1875 | ||
1876 | rc = secondary_ops->bprm_set_security(bprm); | |
1877 | if (rc) | |
1878 | return rc; | |
1879 | ||
1880 | bsec = bprm->security; | |
1881 | ||
1882 | if (bsec->set) | |
1883 | return 0; | |
1884 | ||
1885 | tsec = current->security; | |
1886 | isec = inode->i_security; | |
1887 | ||
1888 | /* Default to the current task SID. */ | |
1889 | bsec->sid = tsec->sid; | |
1890 | ||
28eba5bf | 1891 | /* Reset fs, key, and sock SIDs on execve. */ |
1da177e4 | 1892 | tsec->create_sid = 0; |
28eba5bf | 1893 | tsec->keycreate_sid = 0; |
42c3e03e | 1894 | tsec->sockcreate_sid = 0; |
1da177e4 LT |
1895 | |
1896 | if (tsec->exec_sid) { | |
1897 | newsid = tsec->exec_sid; | |
1898 | /* Reset exec SID on execve. */ | |
1899 | tsec->exec_sid = 0; | |
1900 | } else { | |
1901 | /* Check for a default transition on this program. */ | |
1902 | rc = security_transition_sid(tsec->sid, isec->sid, | |
1903 | SECCLASS_PROCESS, &newsid); | |
1904 | if (rc) | |
1905 | return rc; | |
1906 | } | |
1907 | ||
1908 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
3d5ff529 JS |
1909 | ad.u.fs.mnt = bprm->file->f_path.mnt; |
1910 | ad.u.fs.dentry = bprm->file->f_path.dentry; | |
1da177e4 | 1911 | |
3d5ff529 | 1912 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
1da177e4 LT |
1913 | newsid = tsec->sid; |
1914 | ||
1915 | if (tsec->sid == newsid) { | |
1916 | rc = avc_has_perm(tsec->sid, isec->sid, | |
1917 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); | |
1918 | if (rc) | |
1919 | return rc; | |
1920 | } else { | |
1921 | /* Check permissions for the transition. */ | |
1922 | rc = avc_has_perm(tsec->sid, newsid, | |
1923 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); | |
1924 | if (rc) | |
1925 | return rc; | |
1926 | ||
1927 | rc = avc_has_perm(newsid, isec->sid, | |
1928 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); | |
1929 | if (rc) | |
1930 | return rc; | |
1931 | ||
1932 | /* Clear any possibly unsafe personality bits on exec: */ | |
1933 | current->personality &= ~PER_CLEAR_ON_SETID; | |
1934 | ||
1935 | /* Set the security field to the new SID. */ | |
1936 | bsec->sid = newsid; | |
1937 | } | |
1938 | ||
1939 | bsec->set = 1; | |
1940 | return 0; | |
1941 | } | |
1942 | ||
1943 | static int selinux_bprm_check_security (struct linux_binprm *bprm) | |
1944 | { | |
1945 | return secondary_ops->bprm_check_security(bprm); | |
1946 | } | |
1947 | ||
1948 | ||
1949 | static int selinux_bprm_secureexec (struct linux_binprm *bprm) | |
1950 | { | |
1951 | struct task_security_struct *tsec = current->security; | |
1952 | int atsecure = 0; | |
1953 | ||
1954 | if (tsec->osid != tsec->sid) { | |
1955 | /* Enable secure mode for SIDs transitions unless | |
1956 | the noatsecure permission is granted between | |
1957 | the two SIDs, i.e. ahp returns 0. */ | |
1958 | atsecure = avc_has_perm(tsec->osid, tsec->sid, | |
1959 | SECCLASS_PROCESS, | |
1960 | PROCESS__NOATSECURE, NULL); | |
1961 | } | |
1962 | ||
1963 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); | |
1964 | } | |
1965 | ||
1966 | static void selinux_bprm_free_security(struct linux_binprm *bprm) | |
1967 | { | |
9a5f04bf | 1968 | kfree(bprm->security); |
1da177e4 | 1969 | bprm->security = NULL; |
1da177e4 LT |
1970 | } |
1971 | ||
1972 | extern struct vfsmount *selinuxfs_mount; | |
1973 | extern struct dentry *selinux_null; | |
1974 | ||
1975 | /* Derived from fs/exec.c:flush_old_files. */ | |
1976 | static inline void flush_unauthorized_files(struct files_struct * files) | |
1977 | { | |
1978 | struct avc_audit_data ad; | |
1979 | struct file *file, *devnull = NULL; | |
b20c8122 | 1980 | struct tty_struct *tty; |
badf1662 | 1981 | struct fdtable *fdt; |
1da177e4 | 1982 | long j = -1; |
24ec839c | 1983 | int drop_tty = 0; |
1da177e4 | 1984 | |
b20c8122 | 1985 | mutex_lock(&tty_mutex); |
24ec839c | 1986 | tty = get_current_tty(); |
1da177e4 LT |
1987 | if (tty) { |
1988 | file_list_lock(); | |
2f512016 | 1989 | file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); |
1da177e4 LT |
1990 | if (file) { |
1991 | /* Revalidate access to controlling tty. | |
1992 | Use inode_has_perm on the tty inode directly rather | |
1993 | than using file_has_perm, as this particular open | |
1994 | file may belong to another process and we are only | |
1995 | interested in the inode-based check here. */ | |
3d5ff529 | 1996 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1997 | if (inode_has_perm(current, inode, |
1998 | FILE__READ | FILE__WRITE, NULL)) { | |
24ec839c | 1999 | drop_tty = 1; |
1da177e4 LT |
2000 | } |
2001 | } | |
2002 | file_list_unlock(); | |
2003 | } | |
b20c8122 | 2004 | mutex_unlock(&tty_mutex); |
98a27ba4 EB |
2005 | /* Reset controlling tty. */ |
2006 | if (drop_tty) | |
2007 | no_tty(); | |
1da177e4 LT |
2008 | |
2009 | /* Revalidate access to inherited open files. */ | |
2010 | ||
2011 | AVC_AUDIT_DATA_INIT(&ad,FS); | |
2012 | ||
2013 | spin_lock(&files->file_lock); | |
2014 | for (;;) { | |
2015 | unsigned long set, i; | |
2016 | int fd; | |
2017 | ||
2018 | j++; | |
2019 | i = j * __NFDBITS; | |
badf1662 | 2020 | fdt = files_fdtable(files); |
bbea9f69 | 2021 | if (i >= fdt->max_fds) |
1da177e4 | 2022 | break; |
badf1662 | 2023 | set = fdt->open_fds->fds_bits[j]; |
1da177e4 LT |
2024 | if (!set) |
2025 | continue; | |
2026 | spin_unlock(&files->file_lock); | |
2027 | for ( ; set ; i++,set >>= 1) { | |
2028 | if (set & 1) { | |
2029 | file = fget(i); | |
2030 | if (!file) | |
2031 | continue; | |
2032 | if (file_has_perm(current, | |
2033 | file, | |
2034 | file_to_av(file))) { | |
2035 | sys_close(i); | |
2036 | fd = get_unused_fd(); | |
2037 | if (fd != i) { | |
2038 | if (fd >= 0) | |
2039 | put_unused_fd(fd); | |
2040 | fput(file); | |
2041 | continue; | |
2042 | } | |
2043 | if (devnull) { | |
095975da | 2044 | get_file(devnull); |
1da177e4 LT |
2045 | } else { |
2046 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); | |
fc5d81e6 AM |
2047 | if (IS_ERR(devnull)) { |
2048 | devnull = NULL; | |
1da177e4 LT |
2049 | put_unused_fd(fd); |
2050 | fput(file); | |
2051 | continue; | |
2052 | } | |
2053 | } | |
2054 | fd_install(fd, devnull); | |
2055 | } | |
2056 | fput(file); | |
2057 | } | |
2058 | } | |
2059 | spin_lock(&files->file_lock); | |
2060 | ||
2061 | } | |
2062 | spin_unlock(&files->file_lock); | |
2063 | } | |
2064 | ||
2065 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
2066 | { | |
2067 | struct task_security_struct *tsec; | |
2068 | struct bprm_security_struct *bsec; | |
2069 | u32 sid; | |
2070 | int rc; | |
2071 | ||
2072 | secondary_ops->bprm_apply_creds(bprm, unsafe); | |
2073 | ||
2074 | tsec = current->security; | |
2075 | ||
2076 | bsec = bprm->security; | |
2077 | sid = bsec->sid; | |
2078 | ||
2079 | tsec->osid = tsec->sid; | |
2080 | bsec->unsafe = 0; | |
2081 | if (tsec->sid != sid) { | |
2082 | /* Check for shared state. If not ok, leave SID | |
2083 | unchanged and kill. */ | |
2084 | if (unsafe & LSM_UNSAFE_SHARE) { | |
2085 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, | |
2086 | PROCESS__SHARE, NULL); | |
2087 | if (rc) { | |
2088 | bsec->unsafe = 1; | |
2089 | return; | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | /* Check for ptracing, and update the task SID if ok. | |
2094 | Otherwise, leave SID unchanged and kill. */ | |
2095 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
2096 | rc = avc_has_perm(tsec->ptrace_sid, sid, | |
2097 | SECCLASS_PROCESS, PROCESS__PTRACE, | |
2098 | NULL); | |
2099 | if (rc) { | |
2100 | bsec->unsafe = 1; | |
2101 | return; | |
2102 | } | |
2103 | } | |
2104 | tsec->sid = sid; | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * called after apply_creds without the task lock held | |
2110 | */ | |
2111 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) | |
2112 | { | |
2113 | struct task_security_struct *tsec; | |
2114 | struct rlimit *rlim, *initrlim; | |
2115 | struct itimerval itimer; | |
2116 | struct bprm_security_struct *bsec; | |
2117 | int rc, i; | |
2118 | ||
2119 | tsec = current->security; | |
2120 | bsec = bprm->security; | |
2121 | ||
2122 | if (bsec->unsafe) { | |
2123 | force_sig_specific(SIGKILL, current); | |
2124 | return; | |
2125 | } | |
2126 | if (tsec->osid == tsec->sid) | |
2127 | return; | |
2128 | ||
2129 | /* Close files for which the new task SID is not authorized. */ | |
2130 | flush_unauthorized_files(current->files); | |
2131 | ||
2132 | /* Check whether the new SID can inherit signal state | |
2133 | from the old SID. If not, clear itimers to avoid | |
2134 | subsequent signal generation and flush and unblock | |
2135 | signals. This must occur _after_ the task SID has | |
2136 | been updated so that any kill done after the flush | |
2137 | will be checked against the new SID. */ | |
2138 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2139 | PROCESS__SIGINH, NULL); | |
2140 | if (rc) { | |
2141 | memset(&itimer, 0, sizeof itimer); | |
2142 | for (i = 0; i < 3; i++) | |
2143 | do_setitimer(i, &itimer, NULL); | |
2144 | flush_signals(current); | |
2145 | spin_lock_irq(¤t->sighand->siglock); | |
2146 | flush_signal_handlers(current, 1); | |
2147 | sigemptyset(¤t->blocked); | |
2148 | recalc_sigpending(); | |
2149 | spin_unlock_irq(¤t->sighand->siglock); | |
2150 | } | |
2151 | ||
4ac212ad SS |
2152 | /* Always clear parent death signal on SID transitions. */ |
2153 | current->pdeath_signal = 0; | |
2154 | ||
1da177e4 LT |
2155 | /* Check whether the new SID can inherit resource limits |
2156 | from the old SID. If not, reset all soft limits to | |
2157 | the lower of the current task's hard limit and the init | |
2158 | task's soft limit. Note that the setting of hard limits | |
2159 | (even to lower them) can be controlled by the setrlimit | |
2160 | check. The inclusion of the init task's soft limit into | |
2161 | the computation is to avoid resetting soft limits higher | |
2162 | than the default soft limit for cases where the default | |
2163 | is lower than the hard limit, e.g. RLIMIT_CORE or | |
2164 | RLIMIT_STACK.*/ | |
2165 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2166 | PROCESS__RLIMITINH, NULL); | |
2167 | if (rc) { | |
2168 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2169 | rlim = current->signal->rlim + i; | |
2170 | initrlim = init_task.signal->rlim+i; | |
2171 | rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur); | |
2172 | } | |
2173 | if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { | |
2174 | /* | |
2175 | * This will cause RLIMIT_CPU calculations | |
2176 | * to be refigured. | |
2177 | */ | |
2178 | current->it_prof_expires = jiffies_to_cputime(1); | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | /* Wake up the parent if it is waiting so that it can | |
2183 | recheck wait permission to the new task SID. */ | |
2184 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); | |
2185 | } | |
2186 | ||
2187 | /* superblock security operations */ | |
2188 | ||
2189 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2190 | { | |
2191 | return superblock_alloc_security(sb); | |
2192 | } | |
2193 | ||
2194 | static void selinux_sb_free_security(struct super_block *sb) | |
2195 | { | |
2196 | superblock_free_security(sb); | |
2197 | } | |
2198 | ||
2199 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2200 | { | |
2201 | if (plen > olen) | |
2202 | return 0; | |
2203 | ||
2204 | return !memcmp(prefix, option, plen); | |
2205 | } | |
2206 | ||
2207 | static inline int selinux_option(char *option, int len) | |
2208 | { | |
2209 | return (match_prefix("context=", sizeof("context=")-1, option, len) || | |
2210 | match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) || | |
0808925e EP |
2211 | match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) || |
2212 | match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len)); | |
1da177e4 LT |
2213 | } |
2214 | ||
2215 | static inline void take_option(char **to, char *from, int *first, int len) | |
2216 | { | |
2217 | if (!*first) { | |
2218 | **to = ','; | |
2219 | *to += 1; | |
3528a953 | 2220 | } else |
1da177e4 LT |
2221 | *first = 0; |
2222 | memcpy(*to, from, len); | |
2223 | *to += len; | |
2224 | } | |
2225 | ||
3528a953 CO |
2226 | static inline void take_selinux_option(char **to, char *from, int *first, |
2227 | int len) | |
2228 | { | |
2229 | int current_size = 0; | |
2230 | ||
2231 | if (!*first) { | |
2232 | **to = '|'; | |
2233 | *to += 1; | |
2234 | } | |
2235 | else | |
2236 | *first = 0; | |
2237 | ||
2238 | while (current_size < len) { | |
2239 | if (*from != '"') { | |
2240 | **to = *from; | |
2241 | *to += 1; | |
2242 | } | |
2243 | from += 1; | |
2244 | current_size += 1; | |
2245 | } | |
2246 | } | |
2247 | ||
1da177e4 LT |
2248 | static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy) |
2249 | { | |
2250 | int fnosec, fsec, rc = 0; | |
2251 | char *in_save, *in_curr, *in_end; | |
2252 | char *sec_curr, *nosec_save, *nosec; | |
3528a953 | 2253 | int open_quote = 0; |
1da177e4 LT |
2254 | |
2255 | in_curr = orig; | |
2256 | sec_curr = copy; | |
2257 | ||
2258 | /* Binary mount data: just copy */ | |
2259 | if (type->fs_flags & FS_BINARY_MOUNTDATA) { | |
2260 | copy_page(sec_curr, in_curr); | |
2261 | goto out; | |
2262 | } | |
2263 | ||
2264 | nosec = (char *)get_zeroed_page(GFP_KERNEL); | |
2265 | if (!nosec) { | |
2266 | rc = -ENOMEM; | |
2267 | goto out; | |
2268 | } | |
2269 | ||
2270 | nosec_save = nosec; | |
2271 | fnosec = fsec = 1; | |
2272 | in_save = in_end = orig; | |
2273 | ||
2274 | do { | |
3528a953 CO |
2275 | if (*in_end == '"') |
2276 | open_quote = !open_quote; | |
2277 | if ((*in_end == ',' && open_quote == 0) || | |
2278 | *in_end == '\0') { | |
1da177e4 LT |
2279 | int len = in_end - in_curr; |
2280 | ||
2281 | if (selinux_option(in_curr, len)) | |
3528a953 | 2282 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
1da177e4 LT |
2283 | else |
2284 | take_option(&nosec, in_curr, &fnosec, len); | |
2285 | ||
2286 | in_curr = in_end + 1; | |
2287 | } | |
2288 | } while (*in_end++); | |
2289 | ||
6931dfc9 | 2290 | strcpy(in_save, nosec_save); |
da3caa20 | 2291 | free_page((unsigned long)nosec_save); |
1da177e4 LT |
2292 | out: |
2293 | return rc; | |
2294 | } | |
2295 | ||
2296 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) | |
2297 | { | |
2298 | struct avc_audit_data ad; | |
2299 | int rc; | |
2300 | ||
2301 | rc = superblock_doinit(sb, data); | |
2302 | if (rc) | |
2303 | return rc; | |
2304 | ||
2305 | AVC_AUDIT_DATA_INIT(&ad,FS); | |
2306 | ad.u.fs.dentry = sb->s_root; | |
2307 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); | |
2308 | } | |
2309 | ||
726c3342 | 2310 | static int selinux_sb_statfs(struct dentry *dentry) |
1da177e4 LT |
2311 | { |
2312 | struct avc_audit_data ad; | |
2313 | ||
2314 | AVC_AUDIT_DATA_INIT(&ad,FS); | |
726c3342 DH |
2315 | ad.u.fs.dentry = dentry->d_sb->s_root; |
2316 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); | |
1da177e4 LT |
2317 | } |
2318 | ||
2319 | static int selinux_mount(char * dev_name, | |
2320 | struct nameidata *nd, | |
2321 | char * type, | |
2322 | unsigned long flags, | |
2323 | void * data) | |
2324 | { | |
2325 | int rc; | |
2326 | ||
2327 | rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data); | |
2328 | if (rc) | |
2329 | return rc; | |
2330 | ||
2331 | if (flags & MS_REMOUNT) | |
2332 | return superblock_has_perm(current, nd->mnt->mnt_sb, | |
2333 | FILESYSTEM__REMOUNT, NULL); | |
2334 | else | |
2335 | return dentry_has_perm(current, nd->mnt, nd->dentry, | |
2336 | FILE__MOUNTON); | |
2337 | } | |
2338 | ||
2339 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2340 | { | |
2341 | int rc; | |
2342 | ||
2343 | rc = secondary_ops->sb_umount(mnt, flags); | |
2344 | if (rc) | |
2345 | return rc; | |
2346 | ||
2347 | return superblock_has_perm(current,mnt->mnt_sb, | |
2348 | FILESYSTEM__UNMOUNT,NULL); | |
2349 | } | |
2350 | ||
2351 | /* inode security operations */ | |
2352 | ||
2353 | static int selinux_inode_alloc_security(struct inode *inode) | |
2354 | { | |
2355 | return inode_alloc_security(inode); | |
2356 | } | |
2357 | ||
2358 | static void selinux_inode_free_security(struct inode *inode) | |
2359 | { | |
2360 | inode_free_security(inode); | |
2361 | } | |
2362 | ||
5e41ff9e SS |
2363 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
2364 | char **name, void **value, | |
2365 | size_t *len) | |
2366 | { | |
2367 | struct task_security_struct *tsec; | |
2368 | struct inode_security_struct *dsec; | |
2369 | struct superblock_security_struct *sbsec; | |
570bc1c2 | 2370 | u32 newsid, clen; |
5e41ff9e | 2371 | int rc; |
570bc1c2 | 2372 | char *namep = NULL, *context; |
5e41ff9e SS |
2373 | |
2374 | tsec = current->security; | |
2375 | dsec = dir->i_security; | |
2376 | sbsec = dir->i_sb->s_security; | |
5e41ff9e SS |
2377 | |
2378 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
2379 | newsid = tsec->create_sid; | |
2380 | } else { | |
2381 | rc = security_transition_sid(tsec->sid, dsec->sid, | |
2382 | inode_mode_to_security_class(inode->i_mode), | |
2383 | &newsid); | |
2384 | if (rc) { | |
2385 | printk(KERN_WARNING "%s: " | |
2386 | "security_transition_sid failed, rc=%d (dev=%s " | |
2387 | "ino=%ld)\n", | |
2388 | __FUNCTION__, | |
2389 | -rc, inode->i_sb->s_id, inode->i_ino); | |
2390 | return rc; | |
2391 | } | |
2392 | } | |
2393 | ||
296fddf7 EP |
2394 | /* Possibly defer initialization to selinux_complete_init. */ |
2395 | if (sbsec->initialized) { | |
2396 | struct inode_security_struct *isec = inode->i_security; | |
2397 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2398 | isec->sid = newsid; | |
2399 | isec->initialized = 1; | |
2400 | } | |
5e41ff9e | 2401 | |
8aad3875 | 2402 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
25a74f3b SS |
2403 | return -EOPNOTSUPP; |
2404 | ||
570bc1c2 SS |
2405 | if (name) { |
2406 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL); | |
2407 | if (!namep) | |
2408 | return -ENOMEM; | |
2409 | *name = namep; | |
2410 | } | |
5e41ff9e | 2411 | |
570bc1c2 SS |
2412 | if (value && len) { |
2413 | rc = security_sid_to_context(newsid, &context, &clen); | |
2414 | if (rc) { | |
2415 | kfree(namep); | |
2416 | return rc; | |
2417 | } | |
2418 | *value = context; | |
2419 | *len = clen; | |
5e41ff9e | 2420 | } |
5e41ff9e | 2421 | |
5e41ff9e SS |
2422 | return 0; |
2423 | } | |
2424 | ||
1da177e4 LT |
2425 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
2426 | { | |
2427 | return may_create(dir, dentry, SECCLASS_FILE); | |
2428 | } | |
2429 | ||
1da177e4 LT |
2430 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
2431 | { | |
2432 | int rc; | |
2433 | ||
2434 | rc = secondary_ops->inode_link(old_dentry,dir,new_dentry); | |
2435 | if (rc) | |
2436 | return rc; | |
2437 | return may_link(dir, old_dentry, MAY_LINK); | |
2438 | } | |
2439 | ||
1da177e4 LT |
2440 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
2441 | { | |
2442 | int rc; | |
2443 | ||
2444 | rc = secondary_ops->inode_unlink(dir, dentry); | |
2445 | if (rc) | |
2446 | return rc; | |
2447 | return may_link(dir, dentry, MAY_UNLINK); | |
2448 | } | |
2449 | ||
2450 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2451 | { | |
2452 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2453 | } | |
2454 | ||
1da177e4 LT |
2455 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
2456 | { | |
2457 | return may_create(dir, dentry, SECCLASS_DIR); | |
2458 | } | |
2459 | ||
1da177e4 LT |
2460 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
2461 | { | |
2462 | return may_link(dir, dentry, MAY_RMDIR); | |
2463 | } | |
2464 | ||
2465 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2466 | { | |
2467 | int rc; | |
2468 | ||
2469 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); | |
2470 | if (rc) | |
2471 | return rc; | |
2472 | ||
2473 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2474 | } | |
2475 | ||
1da177e4 LT |
2476 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
2477 | struct inode *new_inode, struct dentry *new_dentry) | |
2478 | { | |
2479 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2480 | } | |
2481 | ||
1da177e4 LT |
2482 | static int selinux_inode_readlink(struct dentry *dentry) |
2483 | { | |
2484 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2485 | } | |
2486 | ||
2487 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2488 | { | |
2489 | int rc; | |
2490 | ||
2491 | rc = secondary_ops->inode_follow_link(dentry,nameidata); | |
2492 | if (rc) | |
2493 | return rc; | |
2494 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2495 | } | |
2496 | ||
2497 | static int selinux_inode_permission(struct inode *inode, int mask, | |
2498 | struct nameidata *nd) | |
2499 | { | |
2500 | int rc; | |
2501 | ||
2502 | rc = secondary_ops->inode_permission(inode, mask, nd); | |
2503 | if (rc) | |
2504 | return rc; | |
2505 | ||
2506 | if (!mask) { | |
2507 | /* No permission to check. Existence test. */ | |
2508 | return 0; | |
2509 | } | |
2510 | ||
2511 | return inode_has_perm(current, inode, | |
2512 | file_mask_to_av(inode->i_mode, mask), NULL); | |
2513 | } | |
2514 | ||
2515 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2516 | { | |
2517 | int rc; | |
2518 | ||
2519 | rc = secondary_ops->inode_setattr(dentry, iattr); | |
2520 | if (rc) | |
2521 | return rc; | |
2522 | ||
2523 | if (iattr->ia_valid & ATTR_FORCE) | |
2524 | return 0; | |
2525 | ||
2526 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2527 | ATTR_ATIME_SET | ATTR_MTIME_SET)) | |
2528 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2529 | ||
2530 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); | |
2531 | } | |
2532 | ||
2533 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2534 | { | |
2535 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); | |
2536 | } | |
2537 | ||
b5376771 SH |
2538 | static int selinux_inode_setotherxattr(struct dentry *dentry, char *name) |
2539 | { | |
2540 | if (!strncmp(name, XATTR_SECURITY_PREFIX, | |
2541 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2542 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2543 | if (!capable(CAP_SETFCAP)) | |
2544 | return -EPERM; | |
2545 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2546 | /* A different attribute in the security namespace. | |
2547 | Restrict to administrator. */ | |
2548 | return -EPERM; | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | /* Not an attribute we recognize, so just check the | |
2553 | ordinary setattr permission. */ | |
2554 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2555 | } | |
2556 | ||
1da177e4 LT |
2557 | static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags) |
2558 | { | |
2559 | struct task_security_struct *tsec = current->security; | |
2560 | struct inode *inode = dentry->d_inode; | |
2561 | struct inode_security_struct *isec = inode->i_security; | |
2562 | struct superblock_security_struct *sbsec; | |
2563 | struct avc_audit_data ad; | |
2564 | u32 newsid; | |
2565 | int rc = 0; | |
2566 | ||
b5376771 SH |
2567 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2568 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2569 | |
2570 | sbsec = inode->i_sb->s_security; | |
2571 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) | |
2572 | return -EOPNOTSUPP; | |
2573 | ||
3bd858ab | 2574 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
2575 | return -EPERM; |
2576 | ||
2577 | AVC_AUDIT_DATA_INIT(&ad,FS); | |
2578 | ad.u.fs.dentry = dentry; | |
2579 | ||
2580 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, | |
2581 | FILE__RELABELFROM, &ad); | |
2582 | if (rc) | |
2583 | return rc; | |
2584 | ||
2585 | rc = security_context_to_sid(value, size, &newsid); | |
2586 | if (rc) | |
2587 | return rc; | |
2588 | ||
2589 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, | |
2590 | FILE__RELABELTO, &ad); | |
2591 | if (rc) | |
2592 | return rc; | |
2593 | ||
2594 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, | |
2595 | isec->sclass); | |
2596 | if (rc) | |
2597 | return rc; | |
2598 | ||
2599 | return avc_has_perm(newsid, | |
2600 | sbsec->sid, | |
2601 | SECCLASS_FILESYSTEM, | |
2602 | FILESYSTEM__ASSOCIATE, | |
2603 | &ad); | |
2604 | } | |
2605 | ||
2606 | static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, | |
2607 | void *value, size_t size, int flags) | |
2608 | { | |
2609 | struct inode *inode = dentry->d_inode; | |
2610 | struct inode_security_struct *isec = inode->i_security; | |
2611 | u32 newsid; | |
2612 | int rc; | |
2613 | ||
2614 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2615 | /* Not an attribute we recognize, so nothing to do. */ | |
2616 | return; | |
2617 | } | |
2618 | ||
2619 | rc = security_context_to_sid(value, size, &newsid); | |
2620 | if (rc) { | |
2621 | printk(KERN_WARNING "%s: unable to obtain SID for context " | |
2622 | "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc); | |
2623 | return; | |
2624 | } | |
2625 | ||
2626 | isec->sid = newsid; | |
2627 | return; | |
2628 | } | |
2629 | ||
2630 | static int selinux_inode_getxattr (struct dentry *dentry, char *name) | |
2631 | { | |
1da177e4 LT |
2632 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
2633 | } | |
2634 | ||
2635 | static int selinux_inode_listxattr (struct dentry *dentry) | |
2636 | { | |
2637 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); | |
2638 | } | |
2639 | ||
2640 | static int selinux_inode_removexattr (struct dentry *dentry, char *name) | |
2641 | { | |
b5376771 SH |
2642 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2643 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2644 | |
2645 | /* No one is allowed to remove a SELinux security label. | |
2646 | You can change the label, but all data must be labeled. */ | |
2647 | return -EACCES; | |
2648 | } | |
2649 | ||
d381d8a9 JM |
2650 | /* |
2651 | * Copy the in-core inode security context value to the user. If the | |
2652 | * getxattr() prior to this succeeded, check to see if we need to | |
2653 | * canonicalize the value to be finally returned to the user. | |
2654 | * | |
2655 | * Permission check is handled by selinux_inode_getxattr hook. | |
2656 | */ | |
7306a0b9 | 2657 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err) |
1da177e4 LT |
2658 | { |
2659 | struct inode_security_struct *isec = inode->i_security; | |
d381d8a9 | 2660 | |
8c8570fb DK |
2661 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
2662 | return -EOPNOTSUPP; | |
d381d8a9 | 2663 | |
8c8570fb | 2664 | return selinux_getsecurity(isec->sid, buffer, size); |
1da177e4 LT |
2665 | } |
2666 | ||
2667 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
2668 | const void *value, size_t size, int flags) | |
2669 | { | |
2670 | struct inode_security_struct *isec = inode->i_security; | |
2671 | u32 newsid; | |
2672 | int rc; | |
2673 | ||
2674 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2675 | return -EOPNOTSUPP; | |
2676 | ||
2677 | if (!value || !size) | |
2678 | return -EACCES; | |
2679 | ||
2680 | rc = security_context_to_sid((void*)value, size, &newsid); | |
2681 | if (rc) | |
2682 | return rc; | |
2683 | ||
2684 | isec->sid = newsid; | |
2685 | return 0; | |
2686 | } | |
2687 | ||
2688 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2689 | { | |
2690 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2691 | if (buffer && len <= buffer_size) | |
2692 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2693 | return len; | |
2694 | } | |
2695 | ||
b5376771 SH |
2696 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
2697 | { | |
2698 | return secondary_ops->inode_need_killpriv(dentry); | |
2699 | } | |
2700 | ||
2701 | static int selinux_inode_killpriv(struct dentry *dentry) | |
2702 | { | |
2703 | return secondary_ops->inode_killpriv(dentry); | |
2704 | } | |
2705 | ||
1da177e4 LT |
2706 | /* file security operations */ |
2707 | ||
788e7dd4 | 2708 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
1da177e4 | 2709 | { |
7420ed23 | 2710 | int rc; |
3d5ff529 | 2711 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2712 | |
2713 | if (!mask) { | |
2714 | /* No permission to check. Existence test. */ | |
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2719 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2720 | mask |= MAY_APPEND; | |
2721 | ||
7420ed23 VY |
2722 | rc = file_has_perm(current, file, |
2723 | file_mask_to_av(inode->i_mode, mask)); | |
2724 | if (rc) | |
2725 | return rc; | |
2726 | ||
2727 | return selinux_netlbl_inode_permission(inode, mask); | |
1da177e4 LT |
2728 | } |
2729 | ||
788e7dd4 YN |
2730 | static int selinux_file_permission(struct file *file, int mask) |
2731 | { | |
2732 | struct inode *inode = file->f_path.dentry->d_inode; | |
2733 | struct task_security_struct *tsec = current->security; | |
2734 | struct file_security_struct *fsec = file->f_security; | |
2735 | struct inode_security_struct *isec = inode->i_security; | |
2736 | ||
2737 | if (!mask) { | |
2738 | /* No permission to check. Existence test. */ | |
2739 | return 0; | |
2740 | } | |
2741 | ||
2742 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid | |
2743 | && fsec->pseqno == avc_policy_seqno()) | |
2744 | return selinux_netlbl_inode_permission(inode, mask); | |
2745 | ||
2746 | return selinux_revalidate_file_permission(file, mask); | |
2747 | } | |
2748 | ||
1da177e4 LT |
2749 | static int selinux_file_alloc_security(struct file *file) |
2750 | { | |
2751 | return file_alloc_security(file); | |
2752 | } | |
2753 | ||
2754 | static void selinux_file_free_security(struct file *file) | |
2755 | { | |
2756 | file_free_security(file); | |
2757 | } | |
2758 | ||
2759 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
2760 | unsigned long arg) | |
2761 | { | |
2762 | int error = 0; | |
2763 | ||
2764 | switch (cmd) { | |
2765 | case FIONREAD: | |
2766 | /* fall through */ | |
2767 | case FIBMAP: | |
2768 | /* fall through */ | |
2769 | case FIGETBSZ: | |
2770 | /* fall through */ | |
2771 | case EXT2_IOC_GETFLAGS: | |
2772 | /* fall through */ | |
2773 | case EXT2_IOC_GETVERSION: | |
2774 | error = file_has_perm(current, file, FILE__GETATTR); | |
2775 | break; | |
2776 | ||
2777 | case EXT2_IOC_SETFLAGS: | |
2778 | /* fall through */ | |
2779 | case EXT2_IOC_SETVERSION: | |
2780 | error = file_has_perm(current, file, FILE__SETATTR); | |
2781 | break; | |
2782 | ||
2783 | /* sys_ioctl() checks */ | |
2784 | case FIONBIO: | |
2785 | /* fall through */ | |
2786 | case FIOASYNC: | |
2787 | error = file_has_perm(current, file, 0); | |
2788 | break; | |
2789 | ||
2790 | case KDSKBENT: | |
2791 | case KDSKBSENT: | |
2792 | error = task_has_capability(current,CAP_SYS_TTY_CONFIG); | |
2793 | break; | |
2794 | ||
2795 | /* default case assumes that the command will go | |
2796 | * to the file's ioctl() function. | |
2797 | */ | |
2798 | default: | |
2799 | error = file_has_perm(current, file, FILE__IOCTL); | |
2800 | ||
2801 | } | |
2802 | return error; | |
2803 | } | |
2804 | ||
2805 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
2806 | { | |
2807 | #ifndef CONFIG_PPC32 | |
2808 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
2809 | /* | |
2810 | * We are making executable an anonymous mapping or a | |
2811 | * private file mapping that will also be writable. | |
2812 | * This has an additional check. | |
2813 | */ | |
2814 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); | |
2815 | if (rc) | |
2816 | return rc; | |
2817 | } | |
2818 | #endif | |
2819 | ||
2820 | if (file) { | |
2821 | /* read access is always possible with a mapping */ | |
2822 | u32 av = FILE__READ; | |
2823 | ||
2824 | /* write access only matters if the mapping is shared */ | |
2825 | if (shared && (prot & PROT_WRITE)) | |
2826 | av |= FILE__WRITE; | |
2827 | ||
2828 | if (prot & PROT_EXEC) | |
2829 | av |= FILE__EXECUTE; | |
2830 | ||
2831 | return file_has_perm(current, file, av); | |
2832 | } | |
2833 | return 0; | |
2834 | } | |
2835 | ||
2836 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
ed032189 EP |
2837 | unsigned long prot, unsigned long flags, |
2838 | unsigned long addr, unsigned long addr_only) | |
1da177e4 | 2839 | { |
ed032189 EP |
2840 | int rc = 0; |
2841 | u32 sid = ((struct task_security_struct*)(current->security))->sid; | |
1da177e4 | 2842 | |
ed032189 EP |
2843 | if (addr < mmap_min_addr) |
2844 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
2845 | MEMPROTECT__MMAP_ZERO, NULL); | |
2846 | if (rc || addr_only) | |
1da177e4 LT |
2847 | return rc; |
2848 | ||
2849 | if (selinux_checkreqprot) | |
2850 | prot = reqprot; | |
2851 | ||
2852 | return file_map_prot_check(file, prot, | |
2853 | (flags & MAP_TYPE) == MAP_SHARED); | |
2854 | } | |
2855 | ||
2856 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
2857 | unsigned long reqprot, | |
2858 | unsigned long prot) | |
2859 | { | |
2860 | int rc; | |
2861 | ||
2862 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); | |
2863 | if (rc) | |
2864 | return rc; | |
2865 | ||
2866 | if (selinux_checkreqprot) | |
2867 | prot = reqprot; | |
2868 | ||
2869 | #ifndef CONFIG_PPC32 | |
db4c9641 SS |
2870 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
2871 | rc = 0; | |
2872 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
2873 | vma->vm_end <= vma->vm_mm->brk) { | |
2874 | rc = task_has_perm(current, current, | |
2875 | PROCESS__EXECHEAP); | |
2876 | } else if (!vma->vm_file && | |
2877 | vma->vm_start <= vma->vm_mm->start_stack && | |
2878 | vma->vm_end >= vma->vm_mm->start_stack) { | |
2879 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); | |
2880 | } else if (vma->vm_file && vma->anon_vma) { | |
2881 | /* | |
2882 | * We are making executable a file mapping that has | |
2883 | * had some COW done. Since pages might have been | |
2884 | * written, check ability to execute the possibly | |
2885 | * modified content. This typically should only | |
2886 | * occur for text relocations. | |
2887 | */ | |
2888 | rc = file_has_perm(current, vma->vm_file, | |
2889 | FILE__EXECMOD); | |
2890 | } | |