Merge remote-tracking branch 'asoc/topic/ac97' into asoc-fsl
[deliverable/linux.git] / security / smack / smack_lsm.c
CommitLineData
e114e473
CS
1/*
2 * Simplified MAC Kernel (smack) security module
3 *
4 * This file contains the smack hook function implementations.
5 *
5c6d1125 6 * Authors:
e114e473 7 * Casey Schaufler <casey@schaufler-ca.com>
84088ba2 8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
e114e473
CS
9 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
07feee8f 11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
82c21bfa 12 * Paul Moore <paul@paul-moore.com>
5c6d1125 13 * Copyright (C) 2010 Nokia Corporation
84088ba2 14 * Copyright (C) 2011 Intel Corporation.
e114e473
CS
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
19 */
20
21#include <linux/xattr.h>
22#include <linux/pagemap.h>
23#include <linux/mount.h>
24#include <linux/stat.h>
e114e473
CS
25#include <linux/kd.h>
26#include <asm/ioctls.h>
07feee8f 27#include <linux/ip.h>
e114e473
CS
28#include <linux/tcp.h>
29#include <linux/udp.h>
c6739443 30#include <linux/dccp.h>
5a0e3ad6 31#include <linux/slab.h>
e114e473
CS
32#include <linux/mutex.h>
33#include <linux/pipe_fs_i.h>
e114e473 34#include <net/cipso_ipv4.h>
c6739443
CS
35#include <net/ip.h>
36#include <net/ipv6.h>
d20bdda6 37#include <linux/audit.h>
1fd7317d 38#include <linux/magic.h>
2a7dba39 39#include <linux/dcache.h>
16014d87 40#include <linux/personality.h>
40401530
AV
41#include <linux/msg.h>
42#include <linux/shm.h>
43#include <linux/binfmts.h>
e114e473
CS
44#include "smack.h"
45
c69e8d9c
DH
46#define task_security(task) (task_cred_xxx((task), security))
47
5c6d1125
JS
48#define TRANS_TRUE "TRUE"
49#define TRANS_TRUE_SIZE 4
50
c6739443
CS
51#define SMK_CONNECTING 0
52#define SMK_RECEIVING 1
53#define SMK_SENDING 2
54
55LIST_HEAD(smk_ipv6_port_list);
56
e114e473
CS
57/**
58 * smk_fetch - Fetch the smack label from a file.
59 * @ip: a pointer to the inode
60 * @dp: a pointer to the dentry
61 *
62 * Returns a pointer to the master list entry for the Smack label
63 * or NULL if there was no label to fetch.
64 */
2f823ff8
CS
65static struct smack_known *smk_fetch(const char *name, struct inode *ip,
66 struct dentry *dp)
e114e473
CS
67{
68 int rc;
f7112e6c 69 char *buffer;
2f823ff8 70 struct smack_known *skp = NULL;
e114e473
CS
71
72 if (ip->i_op->getxattr == NULL)
73 return NULL;
74
f7112e6c
CS
75 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
76 if (buffer == NULL)
e114e473
CS
77 return NULL;
78
f7112e6c
CS
79 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
80 if (rc > 0)
2f823ff8 81 skp = smk_import_entry(buffer, rc);
f7112e6c
CS
82
83 kfree(buffer);
84
2f823ff8 85 return skp;
e114e473
CS
86}
87
88/**
89 * new_inode_smack - allocate an inode security blob
90 * @smack: a pointer to the Smack label to use in the blob
91 *
92 * Returns the new blob or NULL if there's no memory available
93 */
94struct inode_smack *new_inode_smack(char *smack)
95{
96 struct inode_smack *isp;
97
ceffec55 98 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
e114e473
CS
99 if (isp == NULL)
100 return NULL;
101
102 isp->smk_inode = smack;
103 isp->smk_flags = 0;
104 mutex_init(&isp->smk_lock);
105
106 return isp;
107}
108
7898e1f8
CS
109/**
110 * new_task_smack - allocate a task security blob
111 * @smack: a pointer to the Smack label to use in the blob
112 *
113 * Returns the new blob or NULL if there's no memory available
114 */
2f823ff8
CS
115static struct task_smack *new_task_smack(struct smack_known *task,
116 struct smack_known *forked, gfp_t gfp)
7898e1f8
CS
117{
118 struct task_smack *tsp;
119
120 tsp = kzalloc(sizeof(struct task_smack), gfp);
121 if (tsp == NULL)
122 return NULL;
123
124 tsp->smk_task = task;
125 tsp->smk_forked = forked;
126 INIT_LIST_HEAD(&tsp->smk_rules);
127 mutex_init(&tsp->smk_rules_lock);
128
129 return tsp;
130}
131
132/**
133 * smk_copy_rules - copy a rule set
134 * @nhead - new rules header pointer
135 * @ohead - old rules header pointer
136 *
137 * Returns 0 on success, -ENOMEM on error
138 */
139static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
140 gfp_t gfp)
141{
142 struct smack_rule *nrp;
143 struct smack_rule *orp;
144 int rc = 0;
145
146 INIT_LIST_HEAD(nhead);
147
148 list_for_each_entry_rcu(orp, ohead, list) {
149 nrp = kzalloc(sizeof(struct smack_rule), gfp);
150 if (nrp == NULL) {
151 rc = -ENOMEM;
152 break;
153 }
154 *nrp = *orp;
155 list_add_rcu(&nrp->list, nhead);
156 }
157 return rc;
158}
159
e114e473
CS
160/*
161 * LSM hooks.
162 * We he, that is fun!
163 */
164
165/**
9e48858f 166 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
e114e473 167 * @ctp: child task pointer
251a2a95 168 * @mode: ptrace attachment mode
e114e473
CS
169 *
170 * Returns 0 if access is OK, an error code otherwise
171 *
172 * Do the capability checks, and require read and write.
173 */
9e48858f 174static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
e114e473
CS
175{
176 int rc;
ecfcc53f 177 struct smk_audit_info ad;
2f823ff8 178 struct smack_known *skp;
e114e473 179
9e48858f 180 rc = cap_ptrace_access_check(ctp, mode);
e114e473
CS
181 if (rc != 0)
182 return rc;
183
2f823ff8 184 skp = smk_of_task(task_security(ctp));
ecfcc53f
EB
185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
186 smk_ad_setfield_u_tsk(&ad, ctp);
187
2f823ff8 188 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
5cd9c58f
DH
189 return rc;
190}
191
192/**
193 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
194 * @ptp: parent task pointer
195 *
196 * Returns 0 if access is OK, an error code otherwise
197 *
198 * Do the capability checks, and require read and write.
199 */
200static int smack_ptrace_traceme(struct task_struct *ptp)
201{
202 int rc;
ecfcc53f 203 struct smk_audit_info ad;
2f823ff8 204 struct smack_known *skp;
5cd9c58f
DH
205
206 rc = cap_ptrace_traceme(ptp);
207 if (rc != 0)
208 return rc;
e114e473 209
2f823ff8 210 skp = smk_of_task(task_security(ptp));
ecfcc53f
EB
211 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
212 smk_ad_setfield_u_tsk(&ad, ptp);
213
2f823ff8 214 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
e114e473
CS
215 return rc;
216}
217
218/**
219 * smack_syslog - Smack approval on syslog
220 * @type: message type
221 *
222 * Require that the task has the floor label
223 *
224 * Returns 0 on success, error code otherwise.
225 */
12b3052c 226static int smack_syslog(int typefrom_file)
e114e473 227{
12b3052c 228 int rc = 0;
2f823ff8 229 struct smack_known *skp = smk_of_current();
e114e473 230
1880eff7 231 if (smack_privileged(CAP_MAC_OVERRIDE))
e114e473
CS
232 return 0;
233
2f823ff8 234 if (skp != &smack_known_floor)
e114e473
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235 rc = -EACCES;
236
237 return rc;
238}
239
240
241/*
242 * Superblock Hooks.
243 */
244
245/**
246 * smack_sb_alloc_security - allocate a superblock blob
247 * @sb: the superblock getting the blob
248 *
249 * Returns 0 on success or -ENOMEM on error.
250 */
251static int smack_sb_alloc_security(struct super_block *sb)
252{
253 struct superblock_smack *sbsp;
254
255 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
256
257 if (sbsp == NULL)
258 return -ENOMEM;
259
260 sbsp->smk_root = smack_known_floor.smk_known;
261 sbsp->smk_default = smack_known_floor.smk_known;
262 sbsp->smk_floor = smack_known_floor.smk_known;
263 sbsp->smk_hat = smack_known_hat.smk_known;
e830b394
CS
264 /*
265 * smk_initialized will be zero from kzalloc.
266 */
e114e473
CS
267 sb->s_security = sbsp;
268
269 return 0;
270}
271
272/**
273 * smack_sb_free_security - free a superblock blob
274 * @sb: the superblock getting the blob
275 *
276 */
277static void smack_sb_free_security(struct super_block *sb)
278{
279 kfree(sb->s_security);
280 sb->s_security = NULL;
281}
282
283/**
284 * smack_sb_copy_data - copy mount options data for processing
e114e473 285 * @orig: where to start
251a2a95 286 * @smackopts: mount options string
e114e473
CS
287 *
288 * Returns 0 on success or -ENOMEM on error.
289 *
290 * Copy the Smack specific mount options out of the mount
291 * options list.
292 */
e0007529 293static int smack_sb_copy_data(char *orig, char *smackopts)
e114e473
CS
294{
295 char *cp, *commap, *otheropts, *dp;
296
e114e473
CS
297 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
298 if (otheropts == NULL)
299 return -ENOMEM;
300
301 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
302 if (strstr(cp, SMK_FSDEFAULT) == cp)
303 dp = smackopts;
304 else if (strstr(cp, SMK_FSFLOOR) == cp)
305 dp = smackopts;
306 else if (strstr(cp, SMK_FSHAT) == cp)
307 dp = smackopts;
308 else if (strstr(cp, SMK_FSROOT) == cp)
309 dp = smackopts;
e830b394
CS
310 else if (strstr(cp, SMK_FSTRANS) == cp)
311 dp = smackopts;
e114e473
CS
312 else
313 dp = otheropts;
314
315 commap = strchr(cp, ',');
316 if (commap != NULL)
317 *commap = '\0';
318
319 if (*dp != '\0')
320 strcat(dp, ",");
321 strcat(dp, cp);
322 }
323
324 strcpy(orig, otheropts);
325 free_page((unsigned long)otheropts);
326
327 return 0;
328}
329
330/**
331 * smack_sb_kern_mount - Smack specific mount processing
332 * @sb: the file system superblock
12204e24 333 * @flags: the mount flags
e114e473
CS
334 * @data: the smack mount options
335 *
336 * Returns 0 on success, an error code on failure
337 */
12204e24 338static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
e114e473
CS
339{
340 struct dentry *root = sb->s_root;
341 struct inode *inode = root->d_inode;
342 struct superblock_smack *sp = sb->s_security;
343 struct inode_smack *isp;
344 char *op;
345 char *commap;
346 char *nsp;
e830b394 347 int transmute = 0;
e114e473 348
e830b394 349 if (sp->smk_initialized)
e114e473 350 return 0;
eb982cb4 351
e114e473 352 sp->smk_initialized = 1;
e114e473
CS
353
354 for (op = data; op != NULL; op = commap) {
355 commap = strchr(op, ',');
356 if (commap != NULL)
357 *commap++ = '\0';
358
359 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
360 op += strlen(SMK_FSHAT);
361 nsp = smk_import(op, 0);
362 if (nsp != NULL)
363 sp->smk_hat = nsp;
364 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
365 op += strlen(SMK_FSFLOOR);
366 nsp = smk_import(op, 0);
367 if (nsp != NULL)
368 sp->smk_floor = nsp;
369 } else if (strncmp(op, SMK_FSDEFAULT,
370 strlen(SMK_FSDEFAULT)) == 0) {
371 op += strlen(SMK_FSDEFAULT);
372 nsp = smk_import(op, 0);
373 if (nsp != NULL)
374 sp->smk_default = nsp;
375 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
376 op += strlen(SMK_FSROOT);
377 nsp = smk_import(op, 0);
378 if (nsp != NULL)
379 sp->smk_root = nsp;
e830b394
CS
380 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
381 op += strlen(SMK_FSTRANS);
382 nsp = smk_import(op, 0);
383 if (nsp != NULL) {
384 sp->smk_root = nsp;
385 transmute = 1;
386 }
e114e473
CS
387 }
388 }
389
390 /*
391 * Initialize the root inode.
392 */
393 isp = inode->i_security;
e830b394 394 if (inode->i_security == NULL) {
e114e473 395 inode->i_security = new_inode_smack(sp->smk_root);
e830b394
CS
396 isp = inode->i_security;
397 } else
e114e473
CS
398 isp->smk_inode = sp->smk_root;
399
e830b394
CS
400 if (transmute)
401 isp->smk_flags |= SMK_INODE_TRANSMUTE;
402
e114e473
CS
403 return 0;
404}
405
406/**
407 * smack_sb_statfs - Smack check on statfs
408 * @dentry: identifies the file system in question
409 *
410 * Returns 0 if current can read the floor of the filesystem,
411 * and error code otherwise
412 */
413static int smack_sb_statfs(struct dentry *dentry)
414{
415 struct superblock_smack *sbp = dentry->d_sb->s_security;
ecfcc53f
EB
416 int rc;
417 struct smk_audit_info ad;
418
a269434d 419 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 420 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 421
ecfcc53f
EB
422 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
423 return rc;
e114e473
CS
424}
425
426/**
427 * smack_sb_mount - Smack check for mounting
428 * @dev_name: unused
251a2a95 429 * @path: mount point
e114e473
CS
430 * @type: unused
431 * @flags: unused
432 * @data: unused
433 *
434 * Returns 0 if current can write the floor of the filesystem
435 * being mounted on, an error code otherwise.
436 */
808d4e3c
AV
437static int smack_sb_mount(const char *dev_name, struct path *path,
438 const char *type, unsigned long flags, void *data)
e114e473 439{
d8c9584e 440 struct superblock_smack *sbp = path->dentry->d_sb->s_security;
ecfcc53f 441 struct smk_audit_info ad;
e114e473 442
f48b7399 443 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f
EB
444 smk_ad_setfield_u_fs_path(&ad, *path);
445
446 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
e114e473
CS
447}
448
449/**
450 * smack_sb_umount - Smack check for unmounting
451 * @mnt: file system to unmount
452 * @flags: unused
453 *
454 * Returns 0 if current can write the floor of the filesystem
455 * being unmounted, an error code otherwise.
456 */
457static int smack_sb_umount(struct vfsmount *mnt, int flags)
458{
459 struct superblock_smack *sbp;
ecfcc53f 460 struct smk_audit_info ad;
a269434d 461 struct path path;
e114e473 462
a269434d
EP
463 path.dentry = mnt->mnt_root;
464 path.mnt = mnt;
e114e473 465
f48b7399 466 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
a269434d 467 smk_ad_setfield_u_fs_path(&ad, path);
e114e473 468
d8c9584e 469 sbp = path.dentry->d_sb->s_security;
ecfcc53f 470 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
e114e473
CS
471}
472
676dac4b
CS
473/*
474 * BPRM hooks
475 */
476
ce8a4321
CS
477/**
478 * smack_bprm_set_creds - set creds for exec
479 * @bprm: the exec information
480 *
481 * Returns 0 if it gets a blob, -ENOMEM otherwise
482 */
676dac4b
CS
483static int smack_bprm_set_creds(struct linux_binprm *bprm)
484{
496ad9aa 485 struct inode *inode = file_inode(bprm->file);
84088ba2 486 struct task_smack *bsp = bprm->cred->security;
676dac4b 487 struct inode_smack *isp;
676dac4b
CS
488 int rc;
489
490 rc = cap_bprm_set_creds(bprm);
491 if (rc != 0)
492 return rc;
493
494 if (bprm->cred_prepared)
495 return 0;
496
84088ba2
JS
497 isp = inode->i_security;
498 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
676dac4b
CS
499 return 0;
500
84088ba2
JS
501 if (bprm->unsafe)
502 return -EPERM;
676dac4b 503
84088ba2
JS
504 bsp->smk_task = isp->smk_task;
505 bprm->per_clear |= PER_CLEAR_ON_SETID;
676dac4b 506
84088ba2
JS
507 return 0;
508}
676dac4b 509
84088ba2
JS
510/**
511 * smack_bprm_committing_creds - Prepare to install the new credentials
512 * from bprm.
513 *
514 * @bprm: binprm for exec
515 */
516static void smack_bprm_committing_creds(struct linux_binprm *bprm)
517{
518 struct task_smack *bsp = bprm->cred->security;
676dac4b 519
84088ba2
JS
520 if (bsp->smk_task != bsp->smk_forked)
521 current->pdeath_signal = 0;
522}
523
524/**
525 * smack_bprm_secureexec - Return the decision to use secureexec.
526 * @bprm: binprm for exec
527 *
528 * Returns 0 on success.
529 */
530static int smack_bprm_secureexec(struct linux_binprm *bprm)
531{
532 struct task_smack *tsp = current_security();
533 int ret = cap_bprm_secureexec(bprm);
534
535 if (!ret && (tsp->smk_task != tsp->smk_forked))
536 ret = 1;
537
538 return ret;
676dac4b
CS
539}
540
e114e473
CS
541/*
542 * Inode hooks
543 */
544
545/**
546 * smack_inode_alloc_security - allocate an inode blob
251a2a95 547 * @inode: the inode in need of a blob
e114e473
CS
548 *
549 * Returns 0 if it gets a blob, -ENOMEM otherwise
550 */
551static int smack_inode_alloc_security(struct inode *inode)
552{
2f823ff8
CS
553 struct smack_known *skp = smk_of_current();
554
555 inode->i_security = new_inode_smack(skp->smk_known);
e114e473
CS
556 if (inode->i_security == NULL)
557 return -ENOMEM;
558 return 0;
559}
560
561/**
562 * smack_inode_free_security - free an inode blob
251a2a95 563 * @inode: the inode with a blob
e114e473
CS
564 *
565 * Clears the blob pointer in inode
566 */
567static void smack_inode_free_security(struct inode *inode)
568{
569 kfree(inode->i_security);
570 inode->i_security = NULL;
571}
572
573/**
574 * smack_inode_init_security - copy out the smack from an inode
575 * @inode: the inode
576 * @dir: unused
2a7dba39 577 * @qstr: unused
e114e473
CS
578 * @name: where to put the attribute name
579 * @value: where to put the attribute value
580 * @len: where to put the length of the attribute
581 *
582 * Returns 0 if it all works out, -ENOMEM if there's no memory
583 */
584static int smack_inode_init_security(struct inode *inode, struct inode *dir,
2a7dba39
EP
585 const struct qstr *qstr, char **name,
586 void **value, size_t *len)
e114e473 587{
2267b13a 588 struct inode_smack *issp = inode->i_security;
2f823ff8 589 struct smack_known *skp = smk_of_current();
e114e473 590 char *isp = smk_of_inode(inode);
5c6d1125 591 char *dsp = smk_of_inode(dir);
7898e1f8 592 int may;
e114e473
CS
593
594 if (name) {
ceffec55 595 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
e114e473
CS
596 if (*name == NULL)
597 return -ENOMEM;
598 }
599
600 if (value) {
7898e1f8 601 rcu_read_lock();
2f823ff8 602 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
7898e1f8 603 rcu_read_unlock();
5c6d1125
JS
604
605 /*
606 * If the access rule allows transmutation and
607 * the directory requests transmutation then
608 * by all means transmute.
2267b13a 609 * Mark the inode as changed.
5c6d1125 610 */
7898e1f8 611 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
2267b13a 612 smk_inode_transmutable(dir)) {
5c6d1125 613 isp = dsp;
2267b13a
CS
614 issp->smk_flags |= SMK_INODE_CHANGED;
615 }
5c6d1125 616
ceffec55 617 *value = kstrdup(isp, GFP_NOFS);
e114e473
CS
618 if (*value == NULL)
619 return -ENOMEM;
620 }
621
622 if (len)
623 *len = strlen(isp) + 1;
624
625 return 0;
626}
627
628/**
629 * smack_inode_link - Smack check on link
630 * @old_dentry: the existing object
631 * @dir: unused
632 * @new_dentry: the new object
633 *
634 * Returns 0 if access is permitted, an error code otherwise
635 */
636static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
637 struct dentry *new_dentry)
638{
e114e473 639 char *isp;
ecfcc53f
EB
640 struct smk_audit_info ad;
641 int rc;
642
a269434d 643 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 644 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473
CS
645
646 isp = smk_of_inode(old_dentry->d_inode);
ecfcc53f 647 rc = smk_curacc(isp, MAY_WRITE, &ad);
e114e473
CS
648
649 if (rc == 0 && new_dentry->d_inode != NULL) {
650 isp = smk_of_inode(new_dentry->d_inode);
ecfcc53f
EB
651 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
652 rc = smk_curacc(isp, MAY_WRITE, &ad);
e114e473
CS
653 }
654
655 return rc;
656}
657
658/**
659 * smack_inode_unlink - Smack check on inode deletion
660 * @dir: containing directory object
661 * @dentry: file to unlink
662 *
663 * Returns 0 if current can write the containing directory
664 * and the object, error code otherwise
665 */
666static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
667{
668 struct inode *ip = dentry->d_inode;
ecfcc53f 669 struct smk_audit_info ad;
e114e473
CS
670 int rc;
671
a269434d 672 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB
673 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
674
e114e473
CS
675 /*
676 * You need write access to the thing you're unlinking
677 */
ecfcc53f
EB
678 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
679 if (rc == 0) {
e114e473
CS
680 /*
681 * You also need write access to the containing directory
682 */
cdb56b60 683 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB
684 smk_ad_setfield_u_fs_inode(&ad, dir);
685 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
686 }
e114e473
CS
687 return rc;
688}
689
690/**
691 * smack_inode_rmdir - Smack check on directory deletion
692 * @dir: containing directory object
693 * @dentry: directory to unlink
694 *
695 * Returns 0 if current can write the containing directory
696 * and the directory, error code otherwise
697 */
698static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
699{
ecfcc53f 700 struct smk_audit_info ad;
e114e473
CS
701 int rc;
702
a269434d 703 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB
704 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
705
e114e473
CS
706 /*
707 * You need write access to the thing you're removing
708 */
ecfcc53f
EB
709 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
710 if (rc == 0) {
e114e473
CS
711 /*
712 * You also need write access to the containing directory
713 */
cdb56b60 714 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB
715 smk_ad_setfield_u_fs_inode(&ad, dir);
716 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
717 }
e114e473
CS
718
719 return rc;
720}
721
722/**
723 * smack_inode_rename - Smack check on rename
724 * @old_inode: the old directory
725 * @old_dentry: unused
726 * @new_inode: the new directory
727 * @new_dentry: unused
728 *
729 * Read and write access is required on both the old and
730 * new directories.
731 *
732 * Returns 0 if access is permitted, an error code otherwise
733 */
734static int smack_inode_rename(struct inode *old_inode,
735 struct dentry *old_dentry,
736 struct inode *new_inode,
737 struct dentry *new_dentry)
738{
739 int rc;
740 char *isp;
ecfcc53f
EB
741 struct smk_audit_info ad;
742
a269434d 743 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 744 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473
CS
745
746 isp = smk_of_inode(old_dentry->d_inode);
ecfcc53f 747 rc = smk_curacc(isp, MAY_READWRITE, &ad);
e114e473
CS
748
749 if (rc == 0 && new_dentry->d_inode != NULL) {
750 isp = smk_of_inode(new_dentry->d_inode);
ecfcc53f
EB
751 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
752 rc = smk_curacc(isp, MAY_READWRITE, &ad);
e114e473 753 }
e114e473
CS
754 return rc;
755}
756
757/**
758 * smack_inode_permission - Smack version of permission()
759 * @inode: the inode in question
760 * @mask: the access requested
e114e473
CS
761 *
762 * This is the important Smack hook.
763 *
764 * Returns 0 if access is permitted, -EACCES otherwise
765 */
e74f71eb 766static int smack_inode_permission(struct inode *inode, int mask)
e114e473 767{
ecfcc53f 768 struct smk_audit_info ad;
e74f71eb 769 int no_block = mask & MAY_NOT_BLOCK;
d09ca739
EP
770
771 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
e114e473
CS
772 /*
773 * No permission to check. Existence test. Yup, it's there.
774 */
775 if (mask == 0)
776 return 0;
8c9e80ed
AK
777
778 /* May be droppable after audit */
e74f71eb 779 if (no_block)
8c9e80ed 780 return -ECHILD;
f48b7399 781 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB
782 smk_ad_setfield_u_fs_inode(&ad, inode);
783 return smk_curacc(smk_of_inode(inode), mask, &ad);
e114e473
CS
784}
785
786/**
787 * smack_inode_setattr - Smack check for setting attributes
788 * @dentry: the object
789 * @iattr: for the force flag
790 *
791 * Returns 0 if access is permitted, an error code otherwise
792 */
793static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
794{
ecfcc53f 795 struct smk_audit_info ad;
e114e473
CS
796 /*
797 * Need to allow for clearing the setuid bit.
798 */
799 if (iattr->ia_valid & ATTR_FORCE)
800 return 0;
a269434d 801 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 802 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 803
ecfcc53f 804 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
e114e473
CS
805}
806
807/**
808 * smack_inode_getattr - Smack check for getting attributes
809 * @mnt: unused
810 * @dentry: the object
811 *
812 * Returns 0 if access is permitted, an error code otherwise
813 */
814static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
815{
ecfcc53f 816 struct smk_audit_info ad;
a269434d 817 struct path path;
ecfcc53f 818
a269434d
EP
819 path.dentry = dentry;
820 path.mnt = mnt;
ecfcc53f 821
f48b7399 822 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
a269434d 823 smk_ad_setfield_u_fs_path(&ad, path);
ecfcc53f 824 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
e114e473
CS
825}
826
827/**
828 * smack_inode_setxattr - Smack check for setting xattrs
829 * @dentry: the object
830 * @name: name of the attribute
831 * @value: unused
832 * @size: unused
833 * @flags: unused
834 *
835 * This protects the Smack attribute explicitly.
836 *
837 * Returns 0 if access is permitted, an error code otherwise
838 */
8f0cfa52
DH
839static int smack_inode_setxattr(struct dentry *dentry, const char *name,
840 const void *value, size_t size, int flags)
e114e473 841{
ecfcc53f 842 struct smk_audit_info ad;
bcdca225 843 int rc = 0;
e114e473 844
bcdca225
CS
845 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
846 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 847 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
7898e1f8
CS
848 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
849 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1880eff7 850 if (!smack_privileged(CAP_MAC_ADMIN))
bcdca225 851 rc = -EPERM;
defc433b
EB
852 /*
853 * check label validity here so import wont fail on
854 * post_setxattr
855 */
f7112e6c 856 if (size == 0 || size >= SMK_LONGLABEL ||
defc433b 857 smk_import(value, size) == NULL)
4303154e 858 rc = -EINVAL;
5c6d1125 859 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1880eff7 860 if (!smack_privileged(CAP_MAC_ADMIN))
5c6d1125
JS
861 rc = -EPERM;
862 if (size != TRANS_TRUE_SIZE ||
863 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
864 rc = -EINVAL;
bcdca225
CS
865 } else
866 rc = cap_inode_setxattr(dentry, name, value, size, flags);
867
a269434d 868 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB
869 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
870
bcdca225 871 if (rc == 0)
ecfcc53f 872 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
bcdca225
CS
873
874 return rc;
e114e473
CS
875}
876
877/**
878 * smack_inode_post_setxattr - Apply the Smack update approved above
879 * @dentry: object
880 * @name: attribute name
881 * @value: attribute value
882 * @size: attribute size
883 * @flags: unused
884 *
885 * Set the pointer in the inode blob to the entry found
886 * in the master label list.
887 */
8f0cfa52
DH
888static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
889 const void *value, size_t size, int flags)
e114e473 890{
2f823ff8 891 struct smack_known *skp;
5c6d1125 892 struct inode_smack *isp = dentry->d_inode->i_security;
676dac4b 893
2f823ff8
CS
894 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
895 isp->smk_flags |= SMK_INODE_TRANSMUTE;
896 return;
897 }
898
899 skp = smk_import_entry(value, size);
676dac4b 900 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
2f823ff8
CS
901 if (skp != NULL)
902 isp->smk_inode = skp->smk_known;
676dac4b
CS
903 else
904 isp->smk_inode = smack_known_invalid.smk_known;
5c6d1125 905 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
2f823ff8
CS
906 if (skp != NULL)
907 isp->smk_task = skp;
676dac4b 908 else
2f823ff8 909 isp->smk_task = &smack_known_invalid;
7898e1f8 910 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
2f823ff8
CS
911 if (skp != NULL)
912 isp->smk_mmap = skp;
7898e1f8 913 else
2f823ff8
CS
914 isp->smk_mmap = &smack_known_invalid;
915 }
e114e473
CS
916
917 return;
918}
919
ce8a4321 920/**
e114e473
CS
921 * smack_inode_getxattr - Smack check on getxattr
922 * @dentry: the object
923 * @name: unused
924 *
925 * Returns 0 if access is permitted, an error code otherwise
926 */
8f0cfa52 927static int smack_inode_getxattr(struct dentry *dentry, const char *name)
e114e473 928{
ecfcc53f
EB
929 struct smk_audit_info ad;
930
a269434d 931 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB
932 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
933
934 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
e114e473
CS
935}
936
ce8a4321 937/**
e114e473
CS
938 * smack_inode_removexattr - Smack check on removexattr
939 * @dentry: the object
940 * @name: name of the attribute
941 *
942 * Removing the Smack attribute requires CAP_MAC_ADMIN
943 *
944 * Returns 0 if access is permitted, an error code otherwise
945 */
8f0cfa52 946static int smack_inode_removexattr(struct dentry *dentry, const char *name)
e114e473 947{
676dac4b 948 struct inode_smack *isp;
ecfcc53f 949 struct smk_audit_info ad;
bcdca225 950 int rc = 0;
e114e473 951
bcdca225
CS
952 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
953 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 954 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
5c6d1125 955 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
7898e1f8
CS
956 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
957 strcmp(name, XATTR_NAME_SMACKMMAP)) {
1880eff7 958 if (!smack_privileged(CAP_MAC_ADMIN))
bcdca225
CS
959 rc = -EPERM;
960 } else
961 rc = cap_inode_removexattr(dentry, name);
962
a269434d 963 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 964 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
bcdca225 965 if (rc == 0)
ecfcc53f 966 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
bcdca225 967
676dac4b
CS
968 if (rc == 0) {
969 isp = dentry->d_inode->i_security;
970 isp->smk_task = NULL;
7898e1f8 971 isp->smk_mmap = NULL;
676dac4b
CS
972 }
973
bcdca225 974 return rc;
e114e473
CS
975}
976
977/**
978 * smack_inode_getsecurity - get smack xattrs
979 * @inode: the object
980 * @name: attribute name
981 * @buffer: where to put the result
251a2a95 982 * @alloc: unused
e114e473
CS
983 *
984 * Returns the size of the attribute or an error code
985 */
986static int smack_inode_getsecurity(const struct inode *inode,
987 const char *name, void **buffer,
988 bool alloc)
989{
990 struct socket_smack *ssp;
991 struct socket *sock;
992 struct super_block *sbp;
993 struct inode *ip = (struct inode *)inode;
994 char *isp;
995 int ilen;
996 int rc = 0;
997
998 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
999 isp = smk_of_inode(inode);
1000 ilen = strlen(isp) + 1;
1001 *buffer = isp;
1002 return ilen;
1003 }
1004
1005 /*
1006 * The rest of the Smack xattrs are only on sockets.
1007 */
1008 sbp = ip->i_sb;
1009 if (sbp->s_magic != SOCKFS_MAGIC)
1010 return -EOPNOTSUPP;
1011
1012 sock = SOCKET_I(ip);
2e1d146a 1013 if (sock == NULL || sock->sk == NULL)
e114e473
CS
1014 return -EOPNOTSUPP;
1015
1016 ssp = sock->sk->sk_security;
1017
1018 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1019 isp = ssp->smk_in;
1020 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
2f823ff8 1021 isp = ssp->smk_out->smk_known;
e114e473
CS
1022 else
1023 return -EOPNOTSUPP;
1024
1025 ilen = strlen(isp) + 1;
1026 if (rc == 0) {
1027 *buffer = isp;
1028 rc = ilen;
1029 }
1030
1031 return rc;
1032}
1033
1034
1035/**
1036 * smack_inode_listsecurity - list the Smack attributes
1037 * @inode: the object
1038 * @buffer: where they go
1039 * @buffer_size: size of buffer
1040 *
1041 * Returns 0 on success, -EINVAL otherwise
1042 */
1043static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1044 size_t buffer_size)
1045{
1046 int len = strlen(XATTR_NAME_SMACK);
1047
1048 if (buffer != NULL && len <= buffer_size) {
1049 memcpy(buffer, XATTR_NAME_SMACK, len);
1050 return len;
1051 }
1052 return -EINVAL;
1053}
1054
d20bdda6
AD
1055/**
1056 * smack_inode_getsecid - Extract inode's security id
1057 * @inode: inode to extract the info from
1058 * @secid: where result will be saved
1059 */
1060static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1061{
1062 struct inode_smack *isp = inode->i_security;
1063
1064 *secid = smack_to_secid(isp->smk_inode);
1065}
1066
e114e473
CS
1067/*
1068 * File Hooks
1069 */
1070
1071/**
1072 * smack_file_permission - Smack check on file operations
1073 * @file: unused
1074 * @mask: unused
1075 *
1076 * Returns 0
1077 *
1078 * Should access checks be done on each read or write?
1079 * UNICOS and SELinux say yes.
1080 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1081 *
1082 * I'll say no for now. Smack does not do the frequent
1083 * label changing that SELinux does.
1084 */
1085static int smack_file_permission(struct file *file, int mask)
1086{
1087 return 0;
1088}
1089
1090/**
1091 * smack_file_alloc_security - assign a file security blob
1092 * @file: the object
1093 *
1094 * The security blob for a file is a pointer to the master
1095 * label list, so no allocation is done.
1096 *
1097 * Returns 0
1098 */
1099static int smack_file_alloc_security(struct file *file)
1100{
2f823ff8
CS
1101 struct smack_known *skp = smk_of_current();
1102
1103 file->f_security = skp->smk_known;
e114e473
CS
1104 return 0;
1105}
1106
1107/**
1108 * smack_file_free_security - clear a file security blob
1109 * @file: the object
1110 *
1111 * The security blob for a file is a pointer to the master
1112 * label list, so no memory is freed.
1113 */
1114static void smack_file_free_security(struct file *file)
1115{
1116 file->f_security = NULL;
1117}
1118
1119/**
1120 * smack_file_ioctl - Smack check on ioctls
1121 * @file: the object
1122 * @cmd: what to do
1123 * @arg: unused
1124 *
1125 * Relies heavily on the correct use of the ioctl command conventions.
1126 *
1127 * Returns 0 if allowed, error code otherwise
1128 */
1129static int smack_file_ioctl(struct file *file, unsigned int cmd,
1130 unsigned long arg)
1131{
1132 int rc = 0;
ecfcc53f
EB
1133 struct smk_audit_info ad;
1134
f48b7399 1135 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1136 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473
CS
1137
1138 if (_IOC_DIR(cmd) & _IOC_WRITE)
ecfcc53f 1139 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS
1140
1141 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
ecfcc53f 1142 rc = smk_curacc(file->f_security, MAY_READ, &ad);
e114e473
CS
1143
1144 return rc;
1145}
1146
1147/**
1148 * smack_file_lock - Smack check on file locking
1149 * @file: the object
251a2a95 1150 * @cmd: unused
e114e473
CS
1151 *
1152 * Returns 0 if current has write access, error code otherwise
1153 */
1154static int smack_file_lock(struct file *file, unsigned int cmd)
1155{
ecfcc53f
EB
1156 struct smk_audit_info ad;
1157
92f42509
EP
1158 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1159 smk_ad_setfield_u_fs_path(&ad, file->f_path);
ecfcc53f 1160 return smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS
1161}
1162
1163/**
1164 * smack_file_fcntl - Smack check on fcntl
1165 * @file: the object
1166 * @cmd: what action to check
1167 * @arg: unused
1168 *
531f1d45
CS
1169 * Generally these operations are harmless.
1170 * File locking operations present an obvious mechanism
1171 * for passing information, so they require write access.
1172 *
e114e473
CS
1173 * Returns 0 if current has access, error code otherwise
1174 */
1175static int smack_file_fcntl(struct file *file, unsigned int cmd,
1176 unsigned long arg)
1177{
ecfcc53f 1178 struct smk_audit_info ad;
531f1d45 1179 int rc = 0;
e114e473 1180
ecfcc53f 1181
e114e473 1182 switch (cmd) {
e114e473 1183 case F_GETLK:
e114e473
CS
1184 case F_SETLK:
1185 case F_SETLKW:
1186 case F_SETOWN:
1187 case F_SETSIG:
531f1d45
CS
1188 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1189 smk_ad_setfield_u_fs_path(&ad, file->f_path);
ecfcc53f 1190 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS
1191 break;
1192 default:
531f1d45 1193 break;
e114e473
CS
1194 }
1195
1196 return rc;
1197}
1198
7898e1f8 1199/**
e5467859 1200 * smack_mmap_file :
7898e1f8
CS
1201 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1202 * if mapping anonymous memory.
1203 * @file contains the file structure for file to map (may be NULL).
1204 * @reqprot contains the protection requested by the application.
1205 * @prot contains the protection that will be applied by the kernel.
1206 * @flags contains the operational flags.
1207 * Return 0 if permission is granted.
1208 */
e5467859 1209static int smack_mmap_file(struct file *file,
7898e1f8 1210 unsigned long reqprot, unsigned long prot,
e5467859 1211 unsigned long flags)
7898e1f8 1212{
272cd7a8 1213 struct smack_known *skp;
2f823ff8 1214 struct smack_known *mkp;
7898e1f8
CS
1215 struct smack_rule *srp;
1216 struct task_smack *tsp;
0e0a070d 1217 char *osmack;
7898e1f8 1218 struct inode_smack *isp;
0e0a070d
CS
1219 int may;
1220 int mmay;
1221 int tmay;
7898e1f8
CS
1222 int rc;
1223
496ad9aa 1224 if (file == NULL)
7898e1f8
CS
1225 return 0;
1226
496ad9aa 1227 isp = file_inode(file)->i_security;
7898e1f8
CS
1228 if (isp->smk_mmap == NULL)
1229 return 0;
2f823ff8 1230 mkp = isp->smk_mmap;
7898e1f8
CS
1231
1232 tsp = current_security();
2f823ff8 1233 skp = smk_of_current();
7898e1f8
CS
1234 rc = 0;
1235
1236 rcu_read_lock();
1237 /*
1238 * For each Smack rule associated with the subject
1239 * label verify that the SMACK64MMAP also has access
1240 * to that rule's object label.
7898e1f8 1241 */
272cd7a8 1242 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
0e0a070d 1243 osmack = srp->smk_object;
7898e1f8
CS
1244 /*
1245 * Matching labels always allows access.
1246 */
2f823ff8 1247 if (mkp->smk_known == osmack)
7898e1f8 1248 continue;
0e0a070d
CS
1249 /*
1250 * If there is a matching local rule take
1251 * that into account as well.
1252 */
2f823ff8 1253 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
0e0a070d
CS
1254 &tsp->smk_rules);
1255 if (may == -ENOENT)
1256 may = srp->smk_access;
1257 else
1258 may &= srp->smk_access;
1259 /*
1260 * If may is zero the SMACK64MMAP subject can't
1261 * possibly have less access.
1262 */
1263 if (may == 0)
1264 continue;
1265
1266 /*
1267 * Fetch the global list entry.
1268 * If there isn't one a SMACK64MMAP subject
1269 * can't have as much access as current.
1270 */
2f823ff8
CS
1271 mmay = smk_access_entry(mkp->smk_known, osmack,
1272 &mkp->smk_rules);
0e0a070d
CS
1273 if (mmay == -ENOENT) {
1274 rc = -EACCES;
1275 break;
1276 }
1277 /*
1278 * If there is a local entry it modifies the
1279 * potential access, too.
1280 */
2f823ff8
CS
1281 tmay = smk_access_entry(mkp->smk_known, osmack,
1282 &tsp->smk_rules);
0e0a070d
CS
1283 if (tmay != -ENOENT)
1284 mmay &= tmay;
7898e1f8 1285
0e0a070d
CS
1286 /*
1287 * If there is any access available to current that is
1288 * not available to a SMACK64MMAP subject
1289 * deny access.
1290 */
75a25637 1291 if ((may | mmay) != mmay) {
0e0a070d 1292 rc = -EACCES;
7898e1f8 1293 break;
0e0a070d 1294 }
7898e1f8
CS
1295 }
1296
1297 rcu_read_unlock();
1298
1299 return rc;
1300}
1301
e114e473
CS
1302/**
1303 * smack_file_set_fowner - set the file security blob value
1304 * @file: object in question
1305 *
1306 * Returns 0
1307 * Further research may be required on this one.
1308 */
1309static int smack_file_set_fowner(struct file *file)
1310{
2f823ff8
CS
1311 struct smack_known *skp = smk_of_current();
1312
1313 file->f_security = skp->smk_known;
e114e473
CS
1314 return 0;
1315}
1316
1317/**
1318 * smack_file_send_sigiotask - Smack on sigio
1319 * @tsk: The target task
1320 * @fown: the object the signal come from
1321 * @signum: unused
1322 *
1323 * Allow a privileged task to get signals even if it shouldn't
1324 *
1325 * Returns 0 if a subject with the object's smack could
1326 * write to the task, an error code otherwise.
1327 */
1328static int smack_file_send_sigiotask(struct task_struct *tsk,
1329 struct fown_struct *fown, int signum)
1330{
2f823ff8
CS
1331 struct smack_known *skp;
1332 struct smack_known *tkp = smk_of_task(tsk->cred->security);
e114e473
CS
1333 struct file *file;
1334 int rc;
ecfcc53f 1335 struct smk_audit_info ad;
e114e473
CS
1336
1337 /*
1338 * struct fown_struct is never outside the context of a struct file
1339 */
1340 file = container_of(fown, struct file, f_owner);
7898e1f8 1341
ecfcc53f 1342 /* we don't log here as rc can be overriden */
2f823ff8
CS
1343 skp = smk_find_entry(file->f_security);
1344 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
5cd9c58f 1345 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
ecfcc53f
EB
1346 rc = 0;
1347
1348 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1349 smk_ad_setfield_u_tsk(&ad, tsk);
2f823ff8 1350 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
e114e473
CS
1351 return rc;
1352}
1353
1354/**
1355 * smack_file_receive - Smack file receive check
1356 * @file: the object
1357 *
1358 * Returns 0 if current has access, error code otherwise
1359 */
1360static int smack_file_receive(struct file *file)
1361{
1362 int may = 0;
ecfcc53f 1363 struct smk_audit_info ad;
e114e473 1364
ecfcc53f
EB
1365 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1366 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473
CS
1367 /*
1368 * This code relies on bitmasks.
1369 */
1370 if (file->f_mode & FMODE_READ)
1371 may = MAY_READ;
1372 if (file->f_mode & FMODE_WRITE)
1373 may |= MAY_WRITE;
1374
ecfcc53f 1375 return smk_curacc(file->f_security, may, &ad);
e114e473
CS
1376}
1377
531f1d45 1378/**
83d49856 1379 * smack_file_open - Smack dentry open processing
531f1d45
CS
1380 * @file: the object
1381 * @cred: unused
1382 *
1383 * Set the security blob in the file structure.
1384 *
1385 * Returns 0
1386 */
83d49856 1387static int smack_file_open(struct file *file, const struct cred *cred)
531f1d45 1388{
496ad9aa 1389 struct inode_smack *isp = file_inode(file)->i_security;
531f1d45
CS
1390
1391 file->f_security = isp->smk_inode;
1392
1393 return 0;
1394}
1395
e114e473
CS
1396/*
1397 * Task hooks
1398 */
1399
ee18d64c
DH
1400/**
1401 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1402 * @new: the new credentials
1403 * @gfp: the atomicity of any memory allocations
1404 *
1405 * Prepare a blank set of credentials for modification. This must allocate all
1406 * the memory the LSM module might require such that cred_transfer() can
1407 * complete without error.
1408 */
1409static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1410{
7898e1f8
CS
1411 struct task_smack *tsp;
1412
1413 tsp = new_task_smack(NULL, NULL, gfp);
1414 if (tsp == NULL)
676dac4b 1415 return -ENOMEM;
7898e1f8
CS
1416
1417 cred->security = tsp;
1418
ee18d64c
DH
1419 return 0;
1420}
1421
1422
e114e473 1423/**
f1752eec
DH
1424 * smack_cred_free - "free" task-level security credentials
1425 * @cred: the credentials in question
e114e473 1426 *
e114e473 1427 */
f1752eec 1428static void smack_cred_free(struct cred *cred)
e114e473 1429{
7898e1f8
CS
1430 struct task_smack *tsp = cred->security;
1431 struct smack_rule *rp;
1432 struct list_head *l;
1433 struct list_head *n;
1434
1435 if (tsp == NULL)
1436 return;
1437 cred->security = NULL;
1438
1439 list_for_each_safe(l, n, &tsp->smk_rules) {
1440 rp = list_entry(l, struct smack_rule, list);
1441 list_del(&rp->list);
1442 kfree(rp);
1443 }
1444 kfree(tsp);
e114e473
CS
1445}
1446
d84f4f99
DH
1447/**
1448 * smack_cred_prepare - prepare new set of credentials for modification
1449 * @new: the new credentials
1450 * @old: the original credentials
1451 * @gfp: the atomicity of any memory allocations
1452 *
1453 * Prepare a new set of credentials for modification.
1454 */
1455static int smack_cred_prepare(struct cred *new, const struct cred *old,
1456 gfp_t gfp)
1457{
676dac4b
CS
1458 struct task_smack *old_tsp = old->security;
1459 struct task_smack *new_tsp;
7898e1f8 1460 int rc;
676dac4b 1461
7898e1f8 1462 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
676dac4b
CS
1463 if (new_tsp == NULL)
1464 return -ENOMEM;
1465
7898e1f8
CS
1466 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1467 if (rc != 0)
1468 return rc;
1469
676dac4b 1470 new->security = new_tsp;
d84f4f99
DH
1471 return 0;
1472}
1473
ee18d64c
DH
1474/**
1475 * smack_cred_transfer - Transfer the old credentials to the new credentials
1476 * @new: the new credentials
1477 * @old: the original credentials
1478 *
1479 * Fill in a set of blank credentials from another set of credentials.
1480 */
1481static void smack_cred_transfer(struct cred *new, const struct cred *old)
1482{
676dac4b
CS
1483 struct task_smack *old_tsp = old->security;
1484 struct task_smack *new_tsp = new->security;
1485
1486 new_tsp->smk_task = old_tsp->smk_task;
1487 new_tsp->smk_forked = old_tsp->smk_task;
7898e1f8
CS
1488 mutex_init(&new_tsp->smk_rules_lock);
1489 INIT_LIST_HEAD(&new_tsp->smk_rules);
1490
1491
1492 /* cbs copy rule list */
ee18d64c
DH
1493}
1494
3a3b7ce9
DH
1495/**
1496 * smack_kernel_act_as - Set the subjective context in a set of credentials
251a2a95
RD
1497 * @new: points to the set of credentials to be modified.
1498 * @secid: specifies the security ID to be set
3a3b7ce9
DH
1499 *
1500 * Set the security data for a kernel service.
1501 */
1502static int smack_kernel_act_as(struct cred *new, u32 secid)
1503{
676dac4b 1504 struct task_smack *new_tsp = new->security;
2f823ff8 1505 struct smack_known *skp = smack_from_secid(secid);
3a3b7ce9 1506
2f823ff8 1507 if (skp == NULL)
3a3b7ce9
DH
1508 return -EINVAL;
1509
2f823ff8 1510 new_tsp->smk_task = skp;
3a3b7ce9
DH
1511 return 0;
1512}
1513
1514/**
1515 * smack_kernel_create_files_as - Set the file creation label in a set of creds
251a2a95
RD
1516 * @new: points to the set of credentials to be modified
1517 * @inode: points to the inode to use as a reference
3a3b7ce9
DH
1518 *
1519 * Set the file creation context in a set of credentials to the same
1520 * as the objective context of the specified inode
1521 */
1522static int smack_kernel_create_files_as(struct cred *new,
1523 struct inode *inode)
1524{
1525 struct inode_smack *isp = inode->i_security;
676dac4b 1526 struct task_smack *tsp = new->security;
3a3b7ce9 1527
2f823ff8
CS
1528 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1529 tsp->smk_task = tsp->smk_forked;
3a3b7ce9
DH
1530 return 0;
1531}
1532
ecfcc53f
EB
1533/**
1534 * smk_curacc_on_task - helper to log task related access
1535 * @p: the task object
531f1d45
CS
1536 * @access: the access requested
1537 * @caller: name of the calling function for audit
ecfcc53f
EB
1538 *
1539 * Return 0 if access is permitted
1540 */
531f1d45
CS
1541static int smk_curacc_on_task(struct task_struct *p, int access,
1542 const char *caller)
ecfcc53f
EB
1543{
1544 struct smk_audit_info ad;
2f823ff8 1545 struct smack_known *skp = smk_of_task(task_security(p));
ecfcc53f 1546
531f1d45 1547 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
ecfcc53f 1548 smk_ad_setfield_u_tsk(&ad, p);
2f823ff8 1549 return smk_curacc(skp->smk_known, access, &ad);
ecfcc53f
EB
1550}
1551
e114e473
CS
1552/**
1553 * smack_task_setpgid - Smack check on setting pgid
1554 * @p: the task object
1555 * @pgid: unused
1556 *
1557 * Return 0 if write access is permitted
1558 */
1559static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1560{
531f1d45 1561 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS
1562}
1563
1564/**
1565 * smack_task_getpgid - Smack access check for getpgid
1566 * @p: the object task
1567 *
1568 * Returns 0 if current can read the object task, error code otherwise
1569 */
1570static int smack_task_getpgid(struct task_struct *p)
1571{
531f1d45 1572 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS
1573}
1574
1575/**
1576 * smack_task_getsid - Smack access check for getsid
1577 * @p: the object task
1578 *
1579 * Returns 0 if current can read the object task, error code otherwise
1580 */
1581static int smack_task_getsid(struct task_struct *p)
1582{
531f1d45 1583 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS
1584}
1585
1586/**
1587 * smack_task_getsecid - get the secid of the task
1588 * @p: the object task
1589 * @secid: where to put the result
1590 *
1591 * Sets the secid to contain a u32 version of the smack label.
1592 */
1593static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1594{
2f823ff8
CS
1595 struct smack_known *skp = smk_of_task(task_security(p));
1596
1597 *secid = skp->smk_secid;
e114e473
CS
1598}
1599
1600/**
1601 * smack_task_setnice - Smack check on setting nice
1602 * @p: the task object
1603 * @nice: unused
1604 *
1605 * Return 0 if write access is permitted
1606 */
1607static int smack_task_setnice(struct task_struct *p, int nice)
1608{
bcdca225
CS
1609 int rc;
1610
1611 rc = cap_task_setnice(p, nice);
1612 if (rc == 0)
531f1d45 1613 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
bcdca225 1614 return rc;
e114e473
CS
1615}
1616
1617/**
1618 * smack_task_setioprio - Smack check on setting ioprio
1619 * @p: the task object
1620 * @ioprio: unused
1621 *
1622 * Return 0 if write access is permitted
1623 */
1624static int smack_task_setioprio(struct task_struct *p, int ioprio)
1625{
bcdca225
CS
1626 int rc;
1627
1628 rc = cap_task_setioprio(p, ioprio);
1629 if (rc == 0)
531f1d45 1630 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
bcdca225 1631 return rc;
e114e473
CS
1632}
1633
1634/**
1635 * smack_task_getioprio - Smack check on reading ioprio
1636 * @p: the task object
1637 *
1638 * Return 0 if read access is permitted
1639 */
1640static int smack_task_getioprio(struct task_struct *p)
1641{
531f1d45 1642 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS
1643}
1644
1645/**
1646 * smack_task_setscheduler - Smack check on setting scheduler
1647 * @p: the task object
1648 * @policy: unused
1649 * @lp: unused
1650 *
1651 * Return 0 if read access is permitted
1652 */
b0ae1981 1653static int smack_task_setscheduler(struct task_struct *p)
e114e473 1654{
bcdca225
CS
1655 int rc;
1656
b0ae1981 1657 rc = cap_task_setscheduler(p);
bcdca225 1658 if (rc == 0)
531f1d45 1659 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
bcdca225 1660 return rc;
e114e473
CS
1661}
1662
1663/**
1664 * smack_task_getscheduler - Smack check on reading scheduler
1665 * @p: the task object
1666 *
1667 * Return 0 if read access is permitted
1668 */
1669static int smack_task_getscheduler(struct task_struct *p)
1670{
531f1d45 1671 return smk_curacc_on_task(p, MAY_READ, __func__);
e114e473
CS
1672}
1673
1674/**
1675 * smack_task_movememory - Smack check on moving memory
1676 * @p: the task object
1677 *
1678 * Return 0 if write access is permitted
1679 */
1680static int smack_task_movememory(struct task_struct *p)
1681{
531f1d45 1682 return smk_curacc_on_task(p, MAY_WRITE, __func__);
e114e473
CS
1683}
1684
1685/**
1686 * smack_task_kill - Smack check on signal delivery
1687 * @p: the task object
1688 * @info: unused
1689 * @sig: unused
1690 * @secid: identifies the smack to use in lieu of current's
1691 *
1692 * Return 0 if write access is permitted
1693 *
1694 * The secid behavior is an artifact of an SELinux hack
1695 * in the USB code. Someday it may go away.
1696 */
1697static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1698 int sig, u32 secid)
1699{
ecfcc53f 1700 struct smk_audit_info ad;
2f823ff8
CS
1701 struct smack_known *skp;
1702 struct smack_known *tkp = smk_of_task(task_security(p));
ecfcc53f
EB
1703
1704 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1705 smk_ad_setfield_u_tsk(&ad, p);
e114e473
CS
1706 /*
1707 * Sending a signal requires that the sender
1708 * can write the receiver.
1709 */
1710 if (secid == 0)
2f823ff8 1711 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
e114e473
CS
1712 /*
1713 * If the secid isn't 0 we're dealing with some USB IO
1714 * specific behavior. This is not clean. For one thing
1715 * we can't take privilege into account.
1716 */
2f823ff8
CS
1717 skp = smack_from_secid(secid);
1718 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
e114e473
CS
1719}
1720
1721/**
1722 * smack_task_wait - Smack access check for waiting
1723 * @p: task to wait for
1724 *
c00bedb3 1725 * Returns 0
e114e473
CS
1726 */
1727static int smack_task_wait(struct task_struct *p)
1728{
e114e473 1729 /*
c00bedb3
CS
1730 * Allow the operation to succeed.
1731 * Zombies are bad.
1732 * In userless environments (e.g. phones) programs
1733 * get marked with SMACK64EXEC and even if the parent
1734 * and child shouldn't be talking the parent still
1735 * may expect to know when the child exits.
e114e473 1736 */
c00bedb3 1737 return 0;
e114e473
CS
1738}
1739
1740/**
1741 * smack_task_to_inode - copy task smack into the inode blob
1742 * @p: task to copy from
251a2a95 1743 * @inode: inode to copy to
e114e473
CS
1744 *
1745 * Sets the smack pointer in the inode security blob
1746 */
1747static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1748{
1749 struct inode_smack *isp = inode->i_security;
2f823ff8
CS
1750 struct smack_known *skp = smk_of_task(task_security(p));
1751
1752 isp->smk_inode = skp->smk_known;
e114e473
CS
1753}
1754
1755/*
1756 * Socket hooks.
1757 */
1758
1759/**
1760 * smack_sk_alloc_security - Allocate a socket blob
1761 * @sk: the socket
1762 * @family: unused
251a2a95 1763 * @gfp_flags: memory allocation flags
e114e473
CS
1764 *
1765 * Assign Smack pointers to current
1766 *
1767 * Returns 0 on success, -ENOMEM is there's no memory
1768 */
1769static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1770{
2f823ff8 1771 struct smack_known *skp = smk_of_current();
e114e473
CS
1772 struct socket_smack *ssp;
1773
1774 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1775 if (ssp == NULL)
1776 return -ENOMEM;
1777
2f823ff8
CS
1778 ssp->smk_in = skp->smk_known;
1779 ssp->smk_out = skp;
272cd7a8 1780 ssp->smk_packet = NULL;
e114e473
CS
1781
1782 sk->sk_security = ssp;
1783
1784 return 0;
1785}
1786
1787/**
1788 * smack_sk_free_security - Free a socket blob
1789 * @sk: the socket
1790 *
1791 * Clears the blob pointer
1792 */
1793static void smack_sk_free_security(struct sock *sk)
1794{
1795 kfree(sk->sk_security);
1796}
1797
07feee8f
PM
1798/**
1799* smack_host_label - check host based restrictions
1800* @sip: the object end
1801*
1802* looks for host based access restrictions
1803*
1804* This version will only be appropriate for really small sets of single label
1805* hosts. The caller is responsible for ensuring that the RCU read lock is
1806* taken before calling this function.
1807*
1808* Returns the label of the far end or NULL if it's not special.
1809*/
1810static char *smack_host_label(struct sockaddr_in *sip)
1811{
1812 struct smk_netlbladdr *snp;
1813 struct in_addr *siap = &sip->sin_addr;
1814
1815 if (siap->s_addr == 0)
1816 return NULL;
1817
1818 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1819 /*
1820 * we break after finding the first match because
1821 * the list is sorted from longest to shortest mask
1822 * so we have found the most specific match
1823 */
1824 if ((&snp->smk_host.sin_addr)->s_addr ==
4303154e
EB
1825 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1826 /* we have found the special CIPSO option */
1827 if (snp->smk_label == smack_cipso_option)
1828 return NULL;
07feee8f 1829 return snp->smk_label;
4303154e 1830 }
07feee8f
PM
1831
1832 return NULL;
1833}
1834
e114e473
CS
1835/**
1836 * smack_netlabel - Set the secattr on a socket
1837 * @sk: the socket
6d3dc07c 1838 * @labeled: socket label scheme
e114e473
CS
1839 *
1840 * Convert the outbound smack value (smk_out) to a
1841 * secattr and attach it to the socket.
1842 *
1843 * Returns 0 on success or an error code
1844 */
6d3dc07c 1845static int smack_netlabel(struct sock *sk, int labeled)
e114e473 1846{
f7112e6c 1847 struct smack_known *skp;
07feee8f 1848 struct socket_smack *ssp = sk->sk_security;
6d3dc07c 1849 int rc = 0;
e114e473 1850
6d3dc07c
CS
1851 /*
1852 * Usually the netlabel code will handle changing the
1853 * packet labeling based on the label.
1854 * The case of a single label host is different, because
1855 * a single label host should never get a labeled packet
1856 * even though the label is usually associated with a packet
1857 * label.
1858 */
1859 local_bh_disable();
1860 bh_lock_sock_nested(sk);
1861
1862 if (ssp->smk_out == smack_net_ambient ||
1863 labeled == SMACK_UNLABELED_SOCKET)
1864 netlbl_sock_delattr(sk);
1865 else {
2f823ff8 1866 skp = ssp->smk_out;
f7112e6c 1867 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
6d3dc07c
CS
1868 }
1869
1870 bh_unlock_sock(sk);
1871 local_bh_enable();
4bc87e62 1872
e114e473
CS
1873 return rc;
1874}
1875
07feee8f
PM
1876/**
1877 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1878 * @sk: the socket
1879 * @sap: the destination address
1880 *
1881 * Set the correct secattr for the given socket based on the destination
1882 * address and perform any outbound access checks needed.
1883 *
1884 * Returns 0 on success or an error code.
1885 *
1886 */
1887static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1888{
2f823ff8 1889 struct smack_known *skp;
07feee8f
PM
1890 int rc;
1891 int sk_lbl;
1892 char *hostsp;
1893 struct socket_smack *ssp = sk->sk_security;
ecfcc53f 1894 struct smk_audit_info ad;
07feee8f
PM
1895
1896 rcu_read_lock();
1897 hostsp = smack_host_label(sap);
1898 if (hostsp != NULL) {
ecfcc53f 1899#ifdef CONFIG_AUDIT
923e9a13
KC
1900 struct lsm_network_audit net;
1901
48c62af6
EP
1902 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1903 ad.a.u.net->family = sap->sin_family;
1904 ad.a.u.net->dport = sap->sin_port;
1905 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
ecfcc53f 1906#endif
923e9a13 1907 sk_lbl = SMACK_UNLABELED_SOCKET;
2f823ff8
CS
1908 skp = ssp->smk_out;
1909 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
07feee8f
PM
1910 } else {
1911 sk_lbl = SMACK_CIPSO_SOCKET;
1912 rc = 0;
1913 }
1914 rcu_read_unlock();
1915 if (rc != 0)
1916 return rc;
1917
1918 return smack_netlabel(sk, sk_lbl);
1919}
1920
c6739443
CS
1921/**
1922 * smk_ipv6_port_label - Smack port access table management
1923 * @sock: socket
1924 * @address: address
1925 *
1926 * Create or update the port list entry
1927 */
1928static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
1929{
1930 struct sock *sk = sock->sk;
1931 struct sockaddr_in6 *addr6;
1932 struct socket_smack *ssp = sock->sk->sk_security;
1933 struct smk_port_label *spp;
1934 unsigned short port = 0;
1935
1936 if (address == NULL) {
1937 /*
1938 * This operation is changing the Smack information
1939 * on the bound socket. Take the changes to the port
1940 * as well.
1941 */
1942 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1943 if (sk != spp->smk_sock)
1944 continue;
1945 spp->smk_in = ssp->smk_in;
1946 spp->smk_out = ssp->smk_out;
1947 return;
1948 }
1949 /*
1950 * A NULL address is only used for updating existing
1951 * bound entries. If there isn't one, it's OK.
1952 */
1953 return;
1954 }
1955
1956 addr6 = (struct sockaddr_in6 *)address;
1957 port = ntohs(addr6->sin6_port);
1958 /*
1959 * This is a special case that is safely ignored.
1960 */
1961 if (port == 0)
1962 return;
1963
1964 /*
1965 * Look for an existing port list entry.
1966 * This is an indication that a port is getting reused.
1967 */
1968 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1969 if (spp->smk_port != port)
1970 continue;
1971 spp->smk_port = port;
1972 spp->smk_sock = sk;
1973 spp->smk_in = ssp->smk_in;
1974 spp->smk_out = ssp->smk_out;
1975 return;
1976 }
1977
1978 /*
1979 * A new port entry is required.
1980 */
1981 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
1982 if (spp == NULL)
1983 return;
1984
1985 spp->smk_port = port;
1986 spp->smk_sock = sk;
1987 spp->smk_in = ssp->smk_in;
1988 spp->smk_out = ssp->smk_out;
1989
1990 list_add(&spp->list, &smk_ipv6_port_list);
1991 return;
1992}
1993
1994/**
1995 * smk_ipv6_port_check - check Smack port access
1996 * @sock: socket
1997 * @address: address
1998 *
1999 * Create or update the port list entry
2000 */
6ea06247 2001static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
c6739443
CS
2002 int act)
2003{
2004 __be16 *bep;
2005 __be32 *be32p;
c6739443
CS
2006 struct smk_port_label *spp;
2007 struct socket_smack *ssp = sk->sk_security;
2f823ff8 2008 struct smack_known *skp;
c6739443 2009 unsigned short port = 0;
c6739443
CS
2010 char *object;
2011 struct smk_audit_info ad;
2012#ifdef CONFIG_AUDIT
2013 struct lsm_network_audit net;
2014#endif
2015
2016 if (act == SMK_RECEIVING) {
2f823ff8 2017 skp = smack_net_ambient;
c6739443
CS
2018 object = ssp->smk_in;
2019 } else {
2f823ff8
CS
2020 skp = ssp->smk_out;
2021 object = smack_net_ambient->smk_known;
c6739443
CS
2022 }
2023
2024 /*
2025 * Get the IP address and port from the address.
2026 */
6ea06247
CS
2027 port = ntohs(address->sin6_port);
2028 bep = (__be16 *)(&address->sin6_addr);
2029 be32p = (__be32 *)(&address->sin6_addr);
c6739443
CS
2030
2031 /*
2032 * It's remote, so port lookup does no good.
2033 */
2034 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2035 goto auditout;
2036
2037 /*
2038 * It's local so the send check has to have passed.
2039 */
2040 if (act == SMK_RECEIVING) {
2f823ff8 2041 skp = &smack_known_web;
c6739443
CS
2042 goto auditout;
2043 }
2044
2045 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2046 if (spp->smk_port != port)
2047 continue;
2048 object = spp->smk_in;
2049 if (act == SMK_CONNECTING)
2f823ff8 2050 ssp->smk_packet = spp->smk_out->smk_known;
c6739443
CS
2051 break;
2052 }
2053
2054auditout:
2055
2056#ifdef CONFIG_AUDIT
2057 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2058 ad.a.u.net->family = sk->sk_family;
2059 ad.a.u.net->dport = port;
2060 if (act == SMK_RECEIVING)
6ea06247 2061 ad.a.u.net->v6info.saddr = address->sin6_addr;
c6739443 2062 else
6ea06247 2063 ad.a.u.net->v6info.daddr = address->sin6_addr;
c6739443 2064#endif
2f823ff8 2065 return smk_access(skp, object, MAY_WRITE, &ad);
c6739443
CS
2066}
2067
e114e473
CS
2068/**
2069 * smack_inode_setsecurity - set smack xattrs
2070 * @inode: the object
2071 * @name: attribute name
2072 * @value: attribute value
2073 * @size: size of the attribute
2074 * @flags: unused
2075 *
2076 * Sets the named attribute in the appropriate blob
2077 *
2078 * Returns 0 on success, or an error code
2079 */
2080static int smack_inode_setsecurity(struct inode *inode, const char *name,
2081 const void *value, size_t size, int flags)
2082{
2f823ff8 2083 struct smack_known *skp;
e114e473
CS
2084 struct inode_smack *nsp = inode->i_security;
2085 struct socket_smack *ssp;
2086 struct socket *sock;
4bc87e62 2087 int rc = 0;
e114e473 2088
f7112e6c 2089 if (value == NULL || size > SMK_LONGLABEL || size == 0)
e114e473
CS
2090 return -EACCES;
2091
2f823ff8
CS
2092 skp = smk_import_entry(value, size);
2093 if (skp == NULL)
e114e473
CS
2094 return -EINVAL;
2095
2096 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2f823ff8 2097 nsp->smk_inode = skp->smk_known;
ddd29ec6 2098 nsp->smk_flags |= SMK_INODE_INSTANT;
e114e473
CS
2099 return 0;
2100 }
2101 /*
2102 * The rest of the Smack xattrs are only on sockets.
2103 */
2104 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2105 return -EOPNOTSUPP;
2106
2107 sock = SOCKET_I(inode);
2e1d146a 2108 if (sock == NULL || sock->sk == NULL)
e114e473
CS
2109 return -EOPNOTSUPP;
2110
2111 ssp = sock->sk->sk_security;
2112
2113 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2f823ff8 2114 ssp->smk_in = skp->smk_known;
e114e473 2115 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2f823ff8 2116 ssp->smk_out = skp;
c6739443 2117 if (sock->sk->sk_family == PF_INET) {
b4e0d5f0
CS
2118 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2119 if (rc != 0)
2120 printk(KERN_WARNING
2121 "Smack: \"%s\" netlbl error %d.\n",
2122 __func__, -rc);
2123 }
e114e473
CS
2124 } else
2125 return -EOPNOTSUPP;
2126
c6739443
CS
2127 if (sock->sk->sk_family == PF_INET6)
2128 smk_ipv6_port_label(sock, NULL);
2129
e114e473
CS
2130 return 0;
2131}
2132
2133/**
2134 * smack_socket_post_create - finish socket setup
2135 * @sock: the socket
2136 * @family: protocol family
2137 * @type: unused
2138 * @protocol: unused
2139 * @kern: unused
2140 *
2141 * Sets the netlabel information on the socket
2142 *
2143 * Returns 0 on success, and error code otherwise
2144 */
2145static int smack_socket_post_create(struct socket *sock, int family,
2146 int type, int protocol, int kern)
2147{
2e1d146a 2148 if (family != PF_INET || sock->sk == NULL)
e114e473
CS
2149 return 0;
2150 /*
2151 * Set the outbound netlbl.
2152 */
6d3dc07c
CS
2153 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2154}
2155
c6739443
CS
2156/**
2157 * smack_socket_bind - record port binding information.
2158 * @sock: the socket
2159 * @address: the port address
2160 * @addrlen: size of the address
2161 *
2162 * Records the label bound to a port.
2163 *
2164 * Returns 0
2165 */
2166static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2167 int addrlen)
2168{
2169 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2170 smk_ipv6_port_label(sock, address);
2171
2172 return 0;
2173}
2174
6d3dc07c
CS
2175/**
2176 * smack_socket_connect - connect access check
2177 * @sock: the socket
2178 * @sap: the other end
2179 * @addrlen: size of sap
2180 *
2181 * Verifies that a connection may be possible
2182 *
2183 * Returns 0 on success, and error code otherwise
2184 */
2185static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2186 int addrlen)
2187{
c6739443
CS
2188 int rc = 0;
2189
2190 if (sock->sk == NULL)
6d3dc07c 2191 return 0;
6d3dc07c 2192
c6739443
CS
2193 switch (sock->sk->sk_family) {
2194 case PF_INET:
2195 if (addrlen < sizeof(struct sockaddr_in))
2196 return -EINVAL;
2197 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2198 break;
2199 case PF_INET6:
2200 if (addrlen < sizeof(struct sockaddr_in6))
2201 return -EINVAL;
6ea06247
CS
2202 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2203 SMK_CONNECTING);
c6739443
CS
2204 break;
2205 }
2206 return rc;
e114e473
CS
2207}
2208
2209/**
2210 * smack_flags_to_may - convert S_ to MAY_ values
2211 * @flags: the S_ value
2212 *
2213 * Returns the equivalent MAY_ value
2214 */
2215static int smack_flags_to_may(int flags)
2216{
2217 int may = 0;
2218
2219 if (flags & S_IRUGO)
2220 may |= MAY_READ;
2221 if (flags & S_IWUGO)
2222 may |= MAY_WRITE;
2223 if (flags & S_IXUGO)
2224 may |= MAY_EXEC;
2225
2226 return may;
2227}
2228
2229/**
2230 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2231 * @msg: the object
2232 *
2233 * Returns 0
2234 */
2235static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2236{
2f823ff8
CS
2237 struct smack_known *skp = smk_of_current();
2238
2239 msg->security = skp->smk_known;
e114e473
CS
2240 return 0;
2241}
2242
2243/**
2244 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2245 * @msg: the object
2246 *
2247 * Clears the blob pointer
2248 */
2249static void smack_msg_msg_free_security(struct msg_msg *msg)
2250{
2251 msg->security = NULL;
2252}
2253
2254/**
2255 * smack_of_shm - the smack pointer for the shm
2256 * @shp: the object
2257 *
2258 * Returns a pointer to the smack value
2259 */
2260static char *smack_of_shm(struct shmid_kernel *shp)
2261{
2262 return (char *)shp->shm_perm.security;
2263}
2264
2265/**
2266 * smack_shm_alloc_security - Set the security blob for shm
2267 * @shp: the object
2268 *
2269 * Returns 0
2270 */
2271static int smack_shm_alloc_security(struct shmid_kernel *shp)
2272{
2273 struct kern_ipc_perm *isp = &shp->shm_perm;
2f823ff8 2274 struct smack_known *skp = smk_of_current();
e114e473 2275
2f823ff8 2276 isp->security = skp->smk_known;
e114e473
CS
2277 return 0;
2278}
2279
2280/**
2281 * smack_shm_free_security - Clear the security blob for shm
2282 * @shp: the object
2283 *
2284 * Clears the blob pointer
2285 */
2286static void smack_shm_free_security(struct shmid_kernel *shp)
2287{
2288 struct kern_ipc_perm *isp = &shp->shm_perm;
2289
2290 isp->security = NULL;
2291}
2292
ecfcc53f
EB
2293/**
2294 * smk_curacc_shm : check if current has access on shm
2295 * @shp : the object
2296 * @access : access requested
2297 *
2298 * Returns 0 if current has the requested access, error code otherwise
2299 */
2300static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2301{
2302 char *ssp = smack_of_shm(shp);
2303 struct smk_audit_info ad;
2304
2305#ifdef CONFIG_AUDIT
2306 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2307 ad.a.u.ipc_id = shp->shm_perm.id;
2308#endif
2309 return smk_curacc(ssp, access, &ad);
2310}
2311
e114e473
CS
2312/**
2313 * smack_shm_associate - Smack access check for shm
2314 * @shp: the object
2315 * @shmflg: access requested
2316 *
2317 * Returns 0 if current has the requested access, error code otherwise
2318 */
2319static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2320{
e114e473
CS
2321 int may;
2322
2323 may = smack_flags_to_may(shmflg);
ecfcc53f 2324 return smk_curacc_shm(shp, may);
e114e473
CS
2325}
2326
2327/**
2328 * smack_shm_shmctl - Smack access check for shm
2329 * @shp: the object
2330 * @cmd: what it wants to do
2331 *
2332 * Returns 0 if current has the requested access, error code otherwise
2333 */
2334static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2335{
e114e473
CS
2336 int may;
2337
2338 switch (cmd) {
2339 case IPC_STAT:
2340 case SHM_STAT:
2341 may = MAY_READ;
2342 break;
2343 case IPC_SET:
2344 case SHM_LOCK:
2345 case SHM_UNLOCK:
2346 case IPC_RMID:
2347 may = MAY_READWRITE;
2348 break;
2349 case IPC_INFO:
2350 case SHM_INFO:
2351 /*
2352 * System level information.
2353 */
2354 return 0;
2355 default:
2356 return -EINVAL;
2357 }
ecfcc53f 2358 return smk_curacc_shm(shp, may);
e114e473
CS
2359}
2360
2361/**
2362 * smack_shm_shmat - Smack access for shmat
2363 * @shp: the object
2364 * @shmaddr: unused
2365 * @shmflg: access requested
2366 *
2367 * Returns 0 if current has the requested access, error code otherwise
2368 */
2369static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2370 int shmflg)
2371{
e114e473
CS
2372 int may;
2373
2374 may = smack_flags_to_may(shmflg);
ecfcc53f 2375 return smk_curacc_shm(shp, may);
e114e473
CS
2376}
2377
2378/**
2379 * smack_of_sem - the smack pointer for the sem
2380 * @sma: the object
2381 *
2382 * Returns a pointer to the smack value
2383 */
2384static char *smack_of_sem(struct sem_array *sma)
2385{
2386 return (char *)sma->sem_perm.security;
2387}
2388
2389/**
2390 * smack_sem_alloc_security - Set the security blob for sem
2391 * @sma: the object
2392 *
2393 * Returns 0
2394 */
2395static int smack_sem_alloc_security(struct sem_array *sma)
2396{
2397 struct kern_ipc_perm *isp = &sma->sem_perm;
2f823ff8 2398 struct smack_known *skp = smk_of_current();
e114e473 2399
2f823ff8 2400 isp->security = skp->smk_known;
e114e473
CS
2401 return 0;
2402}
2403
2404/**
2405 * smack_sem_free_security - Clear the security blob for sem
2406 * @sma: the object
2407 *
2408 * Clears the blob pointer
2409 */
2410static void smack_sem_free_security(struct sem_array *sma)
2411{
2412 struct kern_ipc_perm *isp = &sma->sem_perm;
2413
2414 isp->security = NULL;
2415}
2416
ecfcc53f
EB
2417/**
2418 * smk_curacc_sem : check if current has access on sem
2419 * @sma : the object
2420 * @access : access requested
2421 *
2422 * Returns 0 if current has the requested access, error code otherwise
2423 */
2424static int smk_curacc_sem(struct sem_array *sma, int access)
2425{
2426 char *ssp = smack_of_sem(sma);
2427 struct smk_audit_info ad;
2428
2429#ifdef CONFIG_AUDIT
2430 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2431 ad.a.u.ipc_id = sma->sem_perm.id;
2432#endif
2433 return smk_curacc(ssp, access, &ad);
2434}
2435
e114e473
CS
2436/**
2437 * smack_sem_associate - Smack access check for sem
2438 * @sma: the object
2439 * @semflg: access requested
2440 *
2441 * Returns 0 if current has the requested access, error code otherwise
2442 */
2443static int smack_sem_associate(struct sem_array *sma, int semflg)
2444{
e114e473
CS
2445 int may;
2446
2447 may = smack_flags_to_may(semflg);
ecfcc53f 2448 return smk_curacc_sem(sma, may);
e114e473
CS
2449}
2450
2451/**
2452 * smack_sem_shmctl - Smack access check for sem
2453 * @sma: the object
2454 * @cmd: what it wants to do
2455 *
2456 * Returns 0 if current has the requested access, error code otherwise
2457 */
2458static int smack_sem_semctl(struct sem_array *sma, int cmd)
2459{
e114e473
CS
2460 int may;
2461
2462 switch (cmd) {
2463 case GETPID:
2464 case GETNCNT:
2465 case GETZCNT:
2466 case GETVAL:
2467 case GETALL:
2468 case IPC_STAT:
2469 case SEM_STAT:
2470 may = MAY_READ;
2471 break;
2472 case SETVAL:
2473 case SETALL:
2474 case IPC_RMID:
2475 case IPC_SET:
2476 may = MAY_READWRITE;
2477 break;
2478 case IPC_INFO:
2479 case SEM_INFO:
2480 /*
2481 * System level information
2482 */
2483 return 0;
2484 default:
2485 return -EINVAL;
2486 }
2487
ecfcc53f 2488 return smk_curacc_sem(sma, may);
e114e473
CS
2489}
2490
2491/**
2492 * smack_sem_semop - Smack checks of semaphore operations
2493 * @sma: the object
2494 * @sops: unused
2495 * @nsops: unused
2496 * @alter: unused
2497 *
2498 * Treated as read and write in all cases.
2499 *
2500 * Returns 0 if access is allowed, error code otherwise
2501 */
2502static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2503 unsigned nsops, int alter)
2504{
ecfcc53f 2505 return smk_curacc_sem(sma, MAY_READWRITE);
e114e473
CS
2506}
2507
2508/**
2509 * smack_msg_alloc_security - Set the security blob for msg
2510 * @msq: the object
2511 *
2512 * Returns 0
2513 */
2514static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2515{
2516 struct kern_ipc_perm *kisp = &msq->q_perm;
2f823ff8 2517 struct smack_known *skp = smk_of_current();
e114e473 2518
2f823ff8 2519 kisp->security = skp->smk_known;
e114e473
CS
2520 return 0;
2521}
2522
2523/**
2524 * smack_msg_free_security - Clear the security blob for msg
2525 * @msq: the object
2526 *
2527 * Clears the blob pointer
2528 */
2529static void smack_msg_queue_free_security(struct msg_queue *msq)
2530{
2531 struct kern_ipc_perm *kisp = &msq->q_perm;
2532
2533 kisp->security = NULL;
2534}
2535
2536/**
2537 * smack_of_msq - the smack pointer for the msq
2538 * @msq: the object
2539 *
2540 * Returns a pointer to the smack value
2541 */
2542static char *smack_of_msq(struct msg_queue *msq)
2543{
2544 return (char *)msq->q_perm.security;
2545}
2546
ecfcc53f
EB
2547/**
2548 * smk_curacc_msq : helper to check if current has access on msq
2549 * @msq : the msq
2550 * @access : access requested
2551 *
2552 * return 0 if current has access, error otherwise
2553 */
2554static int smk_curacc_msq(struct msg_queue *msq, int access)
2555{
2556 char *msp = smack_of_msq(msq);
2557 struct smk_audit_info ad;
2558
2559#ifdef CONFIG_AUDIT
2560 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2561 ad.a.u.ipc_id = msq->q_perm.id;
2562#endif
2563 return smk_curacc(msp, access, &ad);
2564}
2565
e114e473
CS
2566/**
2567 * smack_msg_queue_associate - Smack access check for msg_queue
2568 * @msq: the object
2569 * @msqflg: access requested
2570 *
2571 * Returns 0 if current has the requested access, error code otherwise
2572 */
2573static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2574{
e114e473
CS
2575 int may;
2576
2577 may = smack_flags_to_may(msqflg);
ecfcc53f 2578 return smk_curacc_msq(msq, may);
e114e473
CS
2579}
2580
2581/**
2582 * smack_msg_queue_msgctl - Smack access check for msg_queue
2583 * @msq: the object
2584 * @cmd: what it wants to do
2585 *
2586 * Returns 0 if current has the requested access, error code otherwise
2587 */
2588static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2589{
e114e473
CS
2590 int may;
2591
2592 switch (cmd) {
2593 case IPC_STAT:
2594 case MSG_STAT:
2595 may = MAY_READ;
2596 break;
2597 case IPC_SET:
2598 case IPC_RMID:
2599 may = MAY_READWRITE;
2600 break;
2601 case IPC_INFO:
2602 case MSG_INFO:
2603 /*
2604 * System level information
2605 */
2606 return 0;
2607 default:
2608 return -EINVAL;
2609 }
2610
ecfcc53f 2611 return smk_curacc_msq(msq, may);
e114e473
CS
2612}
2613
2614/**
2615 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2616 * @msq: the object
2617 * @msg: unused
2618 * @msqflg: access requested
2619 *
2620 * Returns 0 if current has the requested access, error code otherwise
2621 */
2622static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2623 int msqflg)
2624{
ecfcc53f 2625 int may;
e114e473 2626
ecfcc53f
EB
2627 may = smack_flags_to_may(msqflg);
2628 return smk_curacc_msq(msq, may);
e114e473
CS
2629}
2630
2631/**
2632 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2633 * @msq: the object
2634 * @msg: unused
2635 * @target: unused
2636 * @type: unused
2637 * @mode: unused
2638 *
2639 * Returns 0 if current has read and write access, error code otherwise
2640 */
2641static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2642 struct task_struct *target, long type, int mode)
2643{
ecfcc53f 2644 return smk_curacc_msq(msq, MAY_READWRITE);
e114e473
CS
2645}
2646
2647/**
2648 * smack_ipc_permission - Smack access for ipc_permission()
2649 * @ipp: the object permissions
2650 * @flag: access requested
2651 *
2652 * Returns 0 if current has read and write access, error code otherwise
2653 */
2654static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2655{
2656 char *isp = ipp->security;
ecfcc53f
EB
2657 int may = smack_flags_to_may(flag);
2658 struct smk_audit_info ad;
e114e473 2659
ecfcc53f
EB
2660#ifdef CONFIG_AUDIT
2661 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2662 ad.a.u.ipc_id = ipp->id;
2663#endif
2664 return smk_curacc(isp, may, &ad);
e114e473
CS
2665}
2666
d20bdda6
AD
2667/**
2668 * smack_ipc_getsecid - Extract smack security id
251a2a95 2669 * @ipp: the object permissions
d20bdda6
AD
2670 * @secid: where result will be saved
2671 */
2672static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2673{
2674 char *smack = ipp->security;
2675
2676 *secid = smack_to_secid(smack);
2677}
2678
e114e473
CS
2679/**
2680 * smack_d_instantiate - Make sure the blob is correct on an inode
3e62cbb8 2681 * @opt_dentry: dentry where inode will be attached
e114e473
CS
2682 * @inode: the object
2683 *
2684 * Set the inode's security blob if it hasn't been done already.
2685 */
2686static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2687{
2688 struct super_block *sbp;
2689 struct superblock_smack *sbsp;
2690 struct inode_smack *isp;
2f823ff8
CS
2691 struct smack_known *skp;
2692 struct smack_known *ckp = smk_of_current();
e114e473 2693 char *final;
5c6d1125
JS
2694 char trattr[TRANS_TRUE_SIZE];
2695 int transflag = 0;
2267b13a 2696 int rc;
e114e473
CS
2697 struct dentry *dp;
2698
2699 if (inode == NULL)
2700 return;
2701
2702 isp = inode->i_security;
2703
2704 mutex_lock(&isp->smk_lock);
2705 /*
2706 * If the inode is already instantiated
2707 * take the quick way out
2708 */
2709 if (isp->smk_flags & SMK_INODE_INSTANT)
2710 goto unlockandout;
2711
2712 sbp = inode->i_sb;
2713 sbsp = sbp->s_security;
2714 /*
2715 * We're going to use the superblock default label
2716 * if there's no label on the file.
2717 */
2718 final = sbsp->smk_default;
2719
e97dcb0e
CS
2720 /*
2721 * If this is the root inode the superblock
2722 * may be in the process of initialization.
2723 * If that is the case use the root value out
2724 * of the superblock.
2725 */
2726 if (opt_dentry->d_parent == opt_dentry) {
2727 isp->smk_inode = sbsp->smk_root;
2728 isp->smk_flags |= SMK_INODE_INSTANT;
2729 goto unlockandout;
2730 }
2731
e114e473
CS
2732 /*
2733 * This is pretty hackish.
2734 * Casey says that we shouldn't have to do
2735 * file system specific code, but it does help
2736 * with keeping it simple.
2737 */
2738 switch (sbp->s_magic) {
2739 case SMACK_MAGIC:
2740 /*
25985edc 2741 * Casey says that it's a little embarrassing
e114e473
CS
2742 * that the smack file system doesn't do
2743 * extended attributes.
2744 */
2745 final = smack_known_star.smk_known;
2746 break;
2747 case PIPEFS_MAGIC:
2748 /*
2749 * Casey says pipes are easy (?)
2750 */
2751 final = smack_known_star.smk_known;
2752 break;
2753 case DEVPTS_SUPER_MAGIC:
2754 /*
2755 * devpts seems content with the label of the task.
2756 * Programs that change smack have to treat the
2757 * pty with respect.
2758 */
2f823ff8 2759 final = ckp->smk_known;
e114e473
CS
2760 break;
2761 case SOCKFS_MAGIC:
2762 /*
b4e0d5f0
CS
2763 * Socket access is controlled by the socket
2764 * structures associated with the task involved.
e114e473 2765 */
b4e0d5f0 2766 final = smack_known_star.smk_known;
e114e473
CS
2767 break;
2768 case PROC_SUPER_MAGIC:
2769 /*
2770 * Casey says procfs appears not to care.
2771 * The superblock default suffices.
2772 */
2773 break;
2774 case TMPFS_MAGIC:
2775 /*
2776 * Device labels should come from the filesystem,
2777 * but watch out, because they're volitile,
2778 * getting recreated on every reboot.
2779 */
2780 final = smack_known_star.smk_known;
2781 /*
2782 * No break.
2783 *
2784 * If a smack value has been set we want to use it,
2785 * but since tmpfs isn't giving us the opportunity
2786 * to set mount options simulate setting the
2787 * superblock default.
2788 */
2789 default:
2790 /*
2791 * This isn't an understood special case.
2792 * Get the value from the xattr.
b4e0d5f0
CS
2793 */
2794
2795 /*
2796 * UNIX domain sockets use lower level socket data.
2797 */
2798 if (S_ISSOCK(inode->i_mode)) {
2799 final = smack_known_star.smk_known;
2800 break;
2801 }
2802 /*
e114e473
CS
2803 * No xattr support means, alas, no SMACK label.
2804 * Use the aforeapplied default.
2805 * It would be curious if the label of the task
2806 * does not match that assigned.
2807 */
2808 if (inode->i_op->getxattr == NULL)
2809 break;
2810 /*
2811 * Get the dentry for xattr.
2812 */
3e62cbb8 2813 dp = dget(opt_dentry);
2f823ff8
CS
2814 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2815 if (skp != NULL)
2816 final = skp->smk_known;
2267b13a
CS
2817
2818 /*
2819 * Transmuting directory
2820 */
2821 if (S_ISDIR(inode->i_mode)) {
2822 /*
2823 * If this is a new directory and the label was
2824 * transmuted when the inode was initialized
2825 * set the transmute attribute on the directory
2826 * and mark the inode.
2827 *
2828 * If there is a transmute attribute on the
2829 * directory mark the inode.
2830 */
2831 if (isp->smk_flags & SMK_INODE_CHANGED) {
2832 isp->smk_flags &= ~SMK_INODE_CHANGED;
2833 rc = inode->i_op->setxattr(dp,
5c6d1125 2834 XATTR_NAME_SMACKTRANSMUTE,
2267b13a
CS
2835 TRANS_TRUE, TRANS_TRUE_SIZE,
2836 0);
2837 } else {
2838 rc = inode->i_op->getxattr(dp,
2839 XATTR_NAME_SMACKTRANSMUTE, trattr,
2840 TRANS_TRUE_SIZE);
2841 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2842 TRANS_TRUE_SIZE) != 0)
2843 rc = -EINVAL;
5c6d1125 2844 }
2267b13a
CS
2845 if (rc >= 0)
2846 transflag = SMK_INODE_TRANSMUTE;
5c6d1125
JS
2847 }
2848 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
7898e1f8 2849 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
676dac4b 2850
e114e473
CS
2851 dput(dp);
2852 break;
2853 }
2854
2855 if (final == NULL)
2f823ff8 2856 isp->smk_inode = ckp->smk_known;
e114e473
CS
2857 else
2858 isp->smk_inode = final;
2859
5c6d1125 2860 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
e114e473
CS
2861
2862unlockandout:
2863 mutex_unlock(&isp->smk_lock);
2864 return;
2865}
2866
2867/**
2868 * smack_getprocattr - Smack process attribute access
2869 * @p: the object task
2870 * @name: the name of the attribute in /proc/.../attr
2871 * @value: where to put the result
2872 *
2873 * Places a copy of the task Smack into value
2874 *
2875 * Returns the length of the smack label or an error code
2876 */
2877static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2878{
2f823ff8 2879 struct smack_known *skp = smk_of_task(task_security(p));
e114e473
CS
2880 char *cp;
2881 int slen;
2882
2883 if (strcmp(name, "current") != 0)
2884 return -EINVAL;
2885
2f823ff8 2886 cp = kstrdup(skp->smk_known, GFP_KERNEL);
e114e473
CS
2887 if (cp == NULL)
2888 return -ENOMEM;
2889
2890 slen = strlen(cp);
2891 *value = cp;
2892 return slen;
2893}
2894
2895/**
2896 * smack_setprocattr - Smack process attribute setting
2897 * @p: the object task
2898 * @name: the name of the attribute in /proc/.../attr
2899 * @value: the value to set
2900 * @size: the size of the value
2901 *
2902 * Sets the Smack value of the task. Only setting self
2903 * is permitted and only with privilege
2904 *
2905 * Returns the length of the smack label or an error code
2906 */
2907static int smack_setprocattr(struct task_struct *p, char *name,
2908 void *value, size_t size)
2909{
676dac4b 2910 struct task_smack *tsp;
d84f4f99 2911 struct cred *new;
2f823ff8 2912 struct smack_known *skp;
e114e473 2913
e114e473
CS
2914 /*
2915 * Changing another process' Smack value is too dangerous
2916 * and supports no sane use case.
2917 */
2918 if (p != current)
2919 return -EPERM;
2920
1880eff7 2921 if (!smack_privileged(CAP_MAC_ADMIN))
5cd9c58f
DH
2922 return -EPERM;
2923
f7112e6c 2924 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
e114e473
CS
2925 return -EINVAL;
2926
2927 if (strcmp(name, "current") != 0)
2928 return -EINVAL;
2929
2f823ff8
CS
2930 skp = smk_import_entry(value, size);
2931 if (skp == NULL)
e114e473
CS
2932 return -EINVAL;
2933
6d3dc07c
CS
2934 /*
2935 * No process is ever allowed the web ("@") label.
2936 */
2f823ff8 2937 if (skp == &smack_known_web)
6d3dc07c
CS
2938 return -EPERM;
2939
d84f4f99 2940 new = prepare_creds();
6d3dc07c 2941 if (new == NULL)
d84f4f99 2942 return -ENOMEM;
7898e1f8 2943
46a2f3b9 2944 tsp = new->security;
2f823ff8 2945 tsp->smk_task = skp;
7898e1f8 2946
d84f4f99 2947 commit_creds(new);
e114e473
CS
2948 return size;
2949}
2950
2951/**
2952 * smack_unix_stream_connect - Smack access on UDS
3610cda5
DM
2953 * @sock: one sock
2954 * @other: the other sock
e114e473
CS
2955 * @newsk: unused
2956 *
2957 * Return 0 if a subject with the smack of sock could access
2958 * an object with the smack of other, otherwise an error code
2959 */
3610cda5
DM
2960static int smack_unix_stream_connect(struct sock *sock,
2961 struct sock *other, struct sock *newsk)
e114e473 2962{
2f823ff8 2963 struct smack_known *skp;
d2e7ad19
JM
2964 struct socket_smack *ssp = sock->sk_security;
2965 struct socket_smack *osp = other->sk_security;
975d5e55 2966 struct socket_smack *nsp = newsk->sk_security;
ecfcc53f 2967 struct smk_audit_info ad;
b4e0d5f0 2968 int rc = 0;
e114e473 2969
923e9a13
KC
2970#ifdef CONFIG_AUDIT
2971 struct lsm_network_audit net;
2972
48c62af6 2973 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3610cda5 2974 smk_ad_setfield_u_net_sk(&ad, other);
923e9a13 2975#endif
b4e0d5f0 2976
2f823ff8
CS
2977 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
2978 skp = ssp->smk_out;
2979 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
2980 }
b4e0d5f0 2981
975d5e55
CS
2982 /*
2983 * Cross reference the peer labels for SO_PEERSEC.
2984 */
2985 if (rc == 0) {
2f823ff8
CS
2986 nsp->smk_packet = ssp->smk_out->smk_known;
2987 ssp->smk_packet = osp->smk_out->smk_known;
975d5e55
CS
2988 }
2989
b4e0d5f0 2990 return rc;
e114e473
CS
2991}
2992
2993/**
2994 * smack_unix_may_send - Smack access on UDS
2995 * @sock: one socket
2996 * @other: the other socket
2997 *
2998 * Return 0 if a subject with the smack of sock could access
2999 * an object with the smack of other, otherwise an error code
3000 */
3001static int smack_unix_may_send(struct socket *sock, struct socket *other)
3002{
b4e0d5f0
CS
3003 struct socket_smack *ssp = sock->sk->sk_security;
3004 struct socket_smack *osp = other->sk->sk_security;
2f823ff8 3005 struct smack_known *skp;
ecfcc53f 3006 struct smk_audit_info ad;
e114e473 3007
923e9a13
KC
3008#ifdef CONFIG_AUDIT
3009 struct lsm_network_audit net;
3010
48c62af6 3011 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
ecfcc53f 3012 smk_ad_setfield_u_net_sk(&ad, other->sk);
923e9a13 3013#endif
b4e0d5f0 3014
2f823ff8
CS
3015 if (smack_privileged(CAP_MAC_OVERRIDE))
3016 return 0;
b4e0d5f0 3017
2f823ff8
CS
3018 skp = ssp->smk_out;
3019 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
e114e473
CS
3020}
3021
6d3dc07c
CS
3022/**
3023 * smack_socket_sendmsg - Smack check based on destination host
3024 * @sock: the socket
251a2a95 3025 * @msg: the message
6d3dc07c
CS
3026 * @size: the size of the message
3027 *
c6739443
CS
3028 * Return 0 if the current subject can write to the destination host.
3029 * For IPv4 this is only a question if the destination is a single label host.
3030 * For IPv6 this is a check against the label of the port.
6d3dc07c
CS
3031 */
3032static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3033 int size)
3034{
3035 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
6ea06247 3036 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
c6739443 3037 int rc = 0;
6d3dc07c
CS
3038
3039 /*
3040 * Perfectly reasonable for this to be NULL
3041 */
c6739443 3042 if (sip == NULL)
6d3dc07c
CS
3043 return 0;
3044
c6739443
CS
3045 switch (sip->sin_family) {
3046 case AF_INET:
3047 rc = smack_netlabel_send(sock->sk, sip);
3048 break;
3049 case AF_INET6:
3050 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3051 break;
3052 }
3053 return rc;
6d3dc07c
CS
3054}
3055
e114e473 3056/**
251a2a95 3057 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
e114e473 3058 * @sap: netlabel secattr
272cd7a8 3059 * @ssp: socket security information
e114e473 3060 *
2f823ff8 3061 * Returns a pointer to a Smack label entry found on the label list.
e114e473 3062 */
2f823ff8
CS
3063static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3064 struct socket_smack *ssp)
e114e473 3065{
2f823ff8 3066 struct smack_known *skp;
f7112e6c 3067 int found = 0;
e114e473 3068
6d3dc07c 3069 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
e114e473 3070 /*
6d3dc07c 3071 * Looks like a CIPSO packet.
e114e473
CS
3072 * If there are flags but no level netlabel isn't
3073 * behaving the way we expect it to.
3074 *
f7112e6c 3075 * Look it up in the label table
e114e473
CS
3076 * Without guidance regarding the smack value
3077 * for the packet fall back on the network
3078 * ambient value.
3079 */
f7112e6c 3080 rcu_read_lock();
2f823ff8
CS
3081 list_for_each_entry(skp, &smack_known_list, list) {
3082 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
f7112e6c
CS
3083 continue;
3084 if (memcmp(sap->attr.mls.cat,
2f823ff8 3085 skp->smk_netlabel.attr.mls.cat,
f7112e6c
CS
3086 SMK_CIPSOLEN) != 0)
3087 continue;
3088 found = 1;
3089 break;
6d3dc07c 3090 }
f7112e6c
CS
3091 rcu_read_unlock();
3092
3093 if (found)
2f823ff8 3094 return skp;
f7112e6c 3095
272cd7a8 3096 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2f823ff8
CS
3097 return &smack_known_web;
3098 return &smack_known_star;
e114e473 3099 }
6d3dc07c
CS
3100 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3101 /*
3102 * Looks like a fallback, which gives us a secid.
3103 */
2f823ff8 3104 skp = smack_from_secid(sap->attr.secid);
6d3dc07c
CS
3105 /*
3106 * This has got to be a bug because it is
3107 * impossible to specify a fallback without
3108 * specifying the label, which will ensure
3109 * it has a secid, and the only way to get a
3110 * secid is from a fallback.
3111 */
2f823ff8
CS
3112 BUG_ON(skp == NULL);
3113 return skp;
e114e473
CS
3114 }
3115 /*
6d3dc07c
CS
3116 * Without guidance regarding the smack value
3117 * for the packet fall back on the network
3118 * ambient value.
e114e473 3119 */
272cd7a8 3120 return smack_net_ambient;
e114e473
CS
3121}
3122
6ea06247 3123static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
c6739443 3124{
c6739443
CS
3125 u8 nexthdr;
3126 int offset;
3127 int proto = -EINVAL;
3128 struct ipv6hdr _ipv6h;
3129 struct ipv6hdr *ip6;
3130 __be16 frag_off;
3131 struct tcphdr _tcph, *th;
3132 struct udphdr _udph, *uh;
3133 struct dccp_hdr _dccph, *dh;
3134
3135 sip->sin6_port = 0;
3136
3137 offset = skb_network_offset(skb);
3138 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3139 if (ip6 == NULL)
3140 return -EINVAL;
3141 sip->sin6_addr = ip6->saddr;
3142
3143 nexthdr = ip6->nexthdr;
3144 offset += sizeof(_ipv6h);
3145 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3146 if (offset < 0)
3147 return -EINVAL;
3148
3149 proto = nexthdr;
3150 switch (proto) {
3151 case IPPROTO_TCP:
3152 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3153 if (th != NULL)
3154 sip->sin6_port = th->source;
3155 break;
3156 case IPPROTO_UDP:
3157 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3158 if (uh != NULL)
3159 sip->sin6_port = uh->source;
3160 break;
3161 case IPPROTO_DCCP:
3162 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3163 if (dh != NULL)
3164 sip->sin6_port = dh->dccph_sport;
3165 break;
3166 }
3167 return proto;
3168}
3169
e114e473
CS
3170/**
3171 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3172 * @sk: socket
3173 * @skb: packet
3174 *
3175 * Returns 0 if the packet should be delivered, an error code otherwise
3176 */
3177static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3178{
3179 struct netlbl_lsm_secattr secattr;
3180 struct socket_smack *ssp = sk->sk_security;
2f823ff8 3181 struct smack_known *skp;
6ea06247 3182 struct sockaddr_in6 sadd;
c6739443 3183 int rc = 0;
ecfcc53f 3184 struct smk_audit_info ad;
923e9a13 3185#ifdef CONFIG_AUDIT
48c62af6 3186 struct lsm_network_audit net;
923e9a13 3187#endif
c6739443
CS
3188 switch (sk->sk_family) {
3189 case PF_INET:
3190 /*
3191 * Translate what netlabel gave us.
3192 */
3193 netlbl_secattr_init(&secattr);
6d3dc07c 3194
c6739443
CS
3195 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3196 if (rc == 0)
2f823ff8 3197 skp = smack_from_secattr(&secattr, ssp);
c6739443 3198 else
2f823ff8 3199 skp = smack_net_ambient;
6d3dc07c 3200
c6739443 3201 netlbl_secattr_destroy(&secattr);
6d3dc07c 3202
ecfcc53f 3203#ifdef CONFIG_AUDIT
c6739443
CS
3204 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3205 ad.a.u.net->family = sk->sk_family;
3206 ad.a.u.net->netif = skb->skb_iif;
3207 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
ecfcc53f 3208#endif
c6739443
CS
3209 /*
3210 * Receiving a packet requires that the other end
3211 * be able to write here. Read access is not required.
3212 * This is the simplist possible security model
3213 * for networking.
3214 */
2f823ff8 3215 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
c6739443
CS
3216 if (rc != 0)
3217 netlbl_skbuff_err(skb, rc, 0);
3218 break;
3219 case PF_INET6:
3220 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3221 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3222 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3223 else
3224 rc = 0;
3225 break;
3226 }
a8134296 3227 return rc;
e114e473
CS
3228}
3229
3230/**
3231 * smack_socket_getpeersec_stream - pull in packet label
3232 * @sock: the socket
3233 * @optval: user's destination
3234 * @optlen: size thereof
251a2a95 3235 * @len: max thereof
e114e473
CS
3236 *
3237 * returns zero on success, an error code otherwise
3238 */
3239static int smack_socket_getpeersec_stream(struct socket *sock,
3240 char __user *optval,
3241 int __user *optlen, unsigned len)
3242{
3243 struct socket_smack *ssp;
272cd7a8
CS
3244 char *rcp = "";
3245 int slen = 1;
e114e473
CS
3246 int rc = 0;
3247
3248 ssp = sock->sk->sk_security;
272cd7a8
CS
3249 if (ssp->smk_packet != NULL) {
3250 rcp = ssp->smk_packet;
3251 slen = strlen(rcp) + 1;
3252 }
e114e473
CS
3253
3254 if (slen > len)
3255 rc = -ERANGE;
272cd7a8 3256 else if (copy_to_user(optval, rcp, slen) != 0)
e114e473
CS
3257 rc = -EFAULT;
3258
3259 if (put_user(slen, optlen) != 0)
3260 rc = -EFAULT;
3261
3262 return rc;
3263}
3264
3265
3266/**
3267 * smack_socket_getpeersec_dgram - pull in packet label
b4e0d5f0 3268 * @sock: the peer socket
e114e473
CS
3269 * @skb: packet data
3270 * @secid: pointer to where to put the secid of the packet
3271 *
3272 * Sets the netlabel socket state on sk from parent
3273 */
3274static int smack_socket_getpeersec_dgram(struct socket *sock,
3275 struct sk_buff *skb, u32 *secid)
3276
3277{
3278 struct netlbl_lsm_secattr secattr;
272cd7a8 3279 struct socket_smack *ssp = NULL;
2f823ff8 3280 struct smack_known *skp;
b4e0d5f0
CS
3281 int family = PF_UNSPEC;
3282 u32 s = 0; /* 0 is the invalid secid */
e114e473
CS
3283 int rc;
3284
b4e0d5f0
CS
3285 if (skb != NULL) {
3286 if (skb->protocol == htons(ETH_P_IP))
3287 family = PF_INET;
3288 else if (skb->protocol == htons(ETH_P_IPV6))
3289 family = PF_INET6;
e114e473 3290 }
b4e0d5f0
CS
3291 if (family == PF_UNSPEC && sock != NULL)
3292 family = sock->sk->sk_family;
e114e473 3293
b4e0d5f0 3294 if (family == PF_UNIX) {
272cd7a8 3295 ssp = sock->sk->sk_security;
2f823ff8 3296 s = ssp->smk_out->smk_secid;
b4e0d5f0
CS
3297 } else if (family == PF_INET || family == PF_INET6) {
3298 /*
3299 * Translate what netlabel gave us.
3300 */
272cd7a8
CS
3301 if (sock != NULL && sock->sk != NULL)
3302 ssp = sock->sk->sk_security;
b4e0d5f0
CS
3303 netlbl_secattr_init(&secattr);
3304 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3305 if (rc == 0) {
2f823ff8
CS
3306 skp = smack_from_secattr(&secattr, ssp);
3307 s = skp->smk_secid;
b4e0d5f0
CS
3308 }
3309 netlbl_secattr_destroy(&secattr);
3310 }
3311 *secid = s;
e114e473
CS
3312 if (s == 0)
3313 return -EINVAL;
e114e473
CS
3314 return 0;
3315}
3316
3317/**
07feee8f
PM
3318 * smack_sock_graft - Initialize a newly created socket with an existing sock
3319 * @sk: child sock
3320 * @parent: parent socket
e114e473 3321 *
07feee8f
PM
3322 * Set the smk_{in,out} state of an existing sock based on the process that
3323 * is creating the new socket.
e114e473
CS
3324 */
3325static void smack_sock_graft(struct sock *sk, struct socket *parent)
3326{
3327 struct socket_smack *ssp;
2f823ff8 3328 struct smack_known *skp = smk_of_current();
e114e473 3329
07feee8f
PM
3330 if (sk == NULL ||
3331 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
e114e473
CS
3332 return;
3333
3334 ssp = sk->sk_security;
2f823ff8
CS
3335 ssp->smk_in = skp->smk_known;
3336 ssp->smk_out = skp;
07feee8f 3337 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
e114e473
CS
3338}
3339
3340/**
3341 * smack_inet_conn_request - Smack access check on connect
3342 * @sk: socket involved
3343 * @skb: packet
3344 * @req: unused
3345 *
3346 * Returns 0 if a task with the packet label could write to
3347 * the socket, otherwise an error code
3348 */
3349static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3350 struct request_sock *req)
3351{
07feee8f 3352 u16 family = sk->sk_family;
f7112e6c 3353 struct smack_known *skp;
e114e473 3354 struct socket_smack *ssp = sk->sk_security;
07feee8f
PM
3355 struct netlbl_lsm_secattr secattr;
3356 struct sockaddr_in addr;
3357 struct iphdr *hdr;
f7112e6c 3358 char *hsp;
e114e473 3359 int rc;
ecfcc53f 3360 struct smk_audit_info ad;
923e9a13 3361#ifdef CONFIG_AUDIT
48c62af6 3362 struct lsm_network_audit net;
923e9a13 3363#endif
e114e473 3364
c6739443
CS
3365 if (family == PF_INET6) {
3366 /*
3367 * Handle mapped IPv4 packets arriving
3368 * via IPv6 sockets. Don't set up netlabel
3369 * processing on IPv6.
3370 */
3371 if (skb->protocol == htons(ETH_P_IP))
3372 family = PF_INET;
3373 else
3374 return 0;
3375 }
e114e473 3376
07feee8f
PM
3377 netlbl_secattr_init(&secattr);
3378 rc = netlbl_skbuff_getattr(skb, family, &secattr);
e114e473 3379 if (rc == 0)
2f823ff8 3380 skp = smack_from_secattr(&secattr, ssp);
e114e473 3381 else
2f823ff8 3382 skp = &smack_known_huh;
07feee8f
PM
3383 netlbl_secattr_destroy(&secattr);
3384
ecfcc53f 3385#ifdef CONFIG_AUDIT
48c62af6
EP
3386 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3387 ad.a.u.net->family = family;
3388 ad.a.u.net->netif = skb->skb_iif;
ecfcc53f
EB
3389 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3390#endif
e114e473 3391 /*
07feee8f
PM
3392 * Receiving a packet requires that the other end be able to write
3393 * here. Read access is not required.
e114e473 3394 */
2f823ff8 3395 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
07feee8f
PM
3396 if (rc != 0)
3397 return rc;
3398
3399 /*
3400 * Save the peer's label in the request_sock so we can later setup
3401 * smk_packet in the child socket so that SO_PEERCRED can report it.
3402 */
2f823ff8 3403 req->peer_secid = skp->smk_secid;
07feee8f
PM
3404
3405 /*
3406 * We need to decide if we want to label the incoming connection here
3407 * if we do we only need to label the request_sock and the stack will
25985edc 3408 * propagate the wire-label to the sock when it is created.
07feee8f
PM
3409 */
3410 hdr = ip_hdr(skb);
3411 addr.sin_addr.s_addr = hdr->saddr;
3412 rcu_read_lock();
f7112e6c
CS
3413 hsp = smack_host_label(&addr);
3414 rcu_read_unlock();
3415
2f823ff8 3416 if (hsp == NULL)
f7112e6c 3417 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
2f823ff8 3418 else
07feee8f 3419 netlbl_req_delattr(req);
e114e473
CS
3420
3421 return rc;
3422}
3423
07feee8f
PM
3424/**
3425 * smack_inet_csk_clone - Copy the connection information to the new socket
3426 * @sk: the new socket
3427 * @req: the connection's request_sock
3428 *
3429 * Transfer the connection's peer label to the newly created socket.
3430 */
3431static void smack_inet_csk_clone(struct sock *sk,
3432 const struct request_sock *req)
3433{
3434 struct socket_smack *ssp = sk->sk_security;
2f823ff8 3435 struct smack_known *skp;
07feee8f 3436
2f823ff8
CS
3437 if (req->peer_secid != 0) {
3438 skp = smack_from_secid(req->peer_secid);
3439 ssp->smk_packet = skp->smk_known;
3440 } else
272cd7a8 3441 ssp->smk_packet = NULL;
07feee8f
PM
3442}
3443
e114e473
CS
3444/*
3445 * Key management security hooks
3446 *
3447 * Casey has not tested key support very heavily.
3448 * The permission check is most likely too restrictive.
3449 * If you care about keys please have a look.
3450 */
3451#ifdef CONFIG_KEYS
3452
3453/**
3454 * smack_key_alloc - Set the key security blob
3455 * @key: object
d84f4f99 3456 * @cred: the credentials to use
e114e473
CS
3457 * @flags: unused
3458 *
3459 * No allocation required
3460 *
3461 * Returns 0
3462 */
d84f4f99 3463static int smack_key_alloc(struct key *key, const struct cred *cred,
e114e473
CS
3464 unsigned long flags)
3465{
2f823ff8
CS
3466 struct smack_known *skp = smk_of_task(cred->security);
3467
3468 key->security = skp->smk_known;
e114e473
CS
3469 return 0;
3470}
3471
3472/**
3473 * smack_key_free - Clear the key security blob
3474 * @key: the object
3475 *
3476 * Clear the blob pointer
3477 */
3478static void smack_key_free(struct key *key)
3479{
3480 key->security = NULL;
3481}
3482
3483/*
3484 * smack_key_permission - Smack access on a key
3485 * @key_ref: gets to the object
d84f4f99 3486 * @cred: the credentials to use
e114e473
CS
3487 * @perm: unused
3488 *
3489 * Return 0 if the task has read and write to the object,
3490 * an error code otherwise
3491 */
3492static int smack_key_permission(key_ref_t key_ref,
d84f4f99 3493 const struct cred *cred, key_perm_t perm)
e114e473
CS
3494{
3495 struct key *keyp;
ecfcc53f 3496 struct smk_audit_info ad;
2f823ff8 3497 struct smack_known *tkp = smk_of_task(cred->security);
e114e473
CS
3498
3499 keyp = key_ref_to_ptr(key_ref);
3500 if (keyp == NULL)
3501 return -EINVAL;
3502 /*
3503 * If the key hasn't been initialized give it access so that
3504 * it may do so.
3505 */
3506 if (keyp->security == NULL)
3507 return 0;
3508 /*
3509 * This should not occur
3510 */
2f823ff8 3511 if (tkp == NULL)
e114e473 3512 return -EACCES;
ecfcc53f
EB
3513#ifdef CONFIG_AUDIT
3514 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3515 ad.a.u.key_struct.key = keyp->serial;
3516 ad.a.u.key_struct.key_desc = keyp->description;
3517#endif
2f823ff8 3518 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
e114e473
CS
3519}
3520#endif /* CONFIG_KEYS */
3521
d20bdda6
AD
3522/*
3523 * Smack Audit hooks
3524 *
3525 * Audit requires a unique representation of each Smack specific
3526 * rule. This unique representation is used to distinguish the
3527 * object to be audited from remaining kernel objects and also
3528 * works as a glue between the audit hooks.
3529 *
3530 * Since repository entries are added but never deleted, we'll use
3531 * the smack_known label address related to the given audit rule as
3532 * the needed unique representation. This also better fits the smack
3533 * model where nearly everything is a label.
3534 */
3535#ifdef CONFIG_AUDIT
3536
3537/**
3538 * smack_audit_rule_init - Initialize a smack audit rule
3539 * @field: audit rule fields given from user-space (audit.h)
3540 * @op: required testing operator (=, !=, >, <, ...)
3541 * @rulestr: smack label to be audited
3542 * @vrule: pointer to save our own audit rule representation
3543 *
3544 * Prepare to audit cases where (@field @op @rulestr) is true.
3545 * The label to be audited is created if necessay.
3546 */
3547static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3548{
3549 char **rule = (char **)vrule;
3550 *rule = NULL;
3551
3552 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3553 return -EINVAL;
3554
5af75d8d 3555 if (op != Audit_equal && op != Audit_not_equal)
d20bdda6
AD
3556 return -EINVAL;
3557
3558 *rule = smk_import(rulestr, 0);
3559
3560 return 0;
3561}
3562
3563/**
3564 * smack_audit_rule_known - Distinguish Smack audit rules
3565 * @krule: rule of interest, in Audit kernel representation format
3566 *
3567 * This is used to filter Smack rules from remaining Audit ones.
3568 * If it's proved that this rule belongs to us, the
3569 * audit_rule_match hook will be called to do the final judgement.
3570 */
3571static int smack_audit_rule_known(struct audit_krule *krule)
3572{
3573 struct audit_field *f;
3574 int i;
3575
3576 for (i = 0; i < krule->field_count; i++) {
3577 f = &krule->fields[i];
3578
3579 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3580 return 1;
3581 }
3582
3583 return 0;
3584}
3585
3586/**
3587 * smack_audit_rule_match - Audit given object ?
3588 * @secid: security id for identifying the object to test
3589 * @field: audit rule flags given from user-space
3590 * @op: required testing operator
3591 * @vrule: smack internal rule presentation
3592 * @actx: audit context associated with the check
3593 *
3594 * The core Audit hook. It's used to take the decision of
3595 * whether to audit or not to audit a given object.
3596 */
3597static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3598 struct audit_context *actx)
3599{
2f823ff8 3600 struct smack_known *skp;
d20bdda6
AD
3601 char *rule = vrule;
3602
3603 if (!rule) {
ceffec55 3604 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
d20bdda6
AD
3605 "Smack: missing rule\n");
3606 return -ENOENT;
3607 }
3608
3609 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3610 return 0;
3611
2f823ff8 3612 skp = smack_from_secid(secid);
d20bdda6
AD
3613
3614 /*
3615 * No need to do string comparisons. If a match occurs,
3616 * both pointers will point to the same smack_known
3617 * label.
3618 */
5af75d8d 3619 if (op == Audit_equal)
2f823ff8 3620 return (rule == skp->smk_known);
5af75d8d 3621 if (op == Audit_not_equal)
2f823ff8 3622 return (rule != skp->smk_known);
d20bdda6
AD
3623
3624 return 0;
3625}
3626
3627/**
3628 * smack_audit_rule_free - free smack rule representation
3629 * @vrule: rule to be freed.
3630 *
3631 * No memory was allocated.
3632 */
3633static void smack_audit_rule_free(void *vrule)
3634{
3635 /* No-op */
3636}
3637
3638#endif /* CONFIG_AUDIT */
3639
746df9b5
DQ
3640/**
3641 * smack_ismaclabel - check if xattr @name references a smack MAC label
3642 * @name: Full xattr name to check.
3643 */
3644static int smack_ismaclabel(const char *name)
3645{
3646 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
3647}
3648
3649
251a2a95 3650/**
e114e473
CS
3651 * smack_secid_to_secctx - return the smack label for a secid
3652 * @secid: incoming integer
3653 * @secdata: destination
3654 * @seclen: how long it is
3655 *
3656 * Exists for networking code.
3657 */
3658static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3659{
2f823ff8 3660 struct smack_known *skp = smack_from_secid(secid);
e114e473 3661
d5630b9d 3662 if (secdata)
2f823ff8
CS
3663 *secdata = skp->smk_known;
3664 *seclen = strlen(skp->smk_known);
e114e473
CS
3665 return 0;
3666}
3667
251a2a95 3668/**
4bc87e62
CS
3669 * smack_secctx_to_secid - return the secid for a smack label
3670 * @secdata: smack label
3671 * @seclen: how long result is
3672 * @secid: outgoing integer
3673 *
3674 * Exists for audit and networking code.
3675 */
e52c1764 3676static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4bc87e62
CS
3677{
3678 *secid = smack_to_secid(secdata);
3679 return 0;
3680}
3681
251a2a95 3682/**
e114e473 3683 * smack_release_secctx - don't do anything.
251a2a95
RD
3684 * @secdata: unused
3685 * @seclen: unused
e114e473
CS
3686 *
3687 * Exists to make sure nothing gets done, and properly
3688 */
3689static void smack_release_secctx(char *secdata, u32 seclen)
3690{
3691}
3692
1ee65e37
DQ
3693static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3694{
3695 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3696}
3697
3698static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3699{
3700 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3701}
3702
3703static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3704{
3705 int len = 0;
3706 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3707
3708 if (len < 0)
3709 return len;
3710 *ctxlen = len;
3711 return 0;
3712}
3713
076c54c5
AD
3714struct security_operations smack_ops = {
3715 .name = "smack",
3716
9e48858f 3717 .ptrace_access_check = smack_ptrace_access_check,
5cd9c58f 3718 .ptrace_traceme = smack_ptrace_traceme,
e114e473 3719 .syslog = smack_syslog,
e114e473
CS
3720
3721 .sb_alloc_security = smack_sb_alloc_security,
3722 .sb_free_security = smack_sb_free_security,
3723 .sb_copy_data = smack_sb_copy_data,
3724 .sb_kern_mount = smack_sb_kern_mount,
3725 .sb_statfs = smack_sb_statfs,
3726 .sb_mount = smack_sb_mount,
3727 .sb_umount = smack_sb_umount,
3728
676dac4b 3729 .bprm_set_creds = smack_bprm_set_creds,
84088ba2
JS
3730 .bprm_committing_creds = smack_bprm_committing_creds,
3731 .bprm_secureexec = smack_bprm_secureexec,
676dac4b 3732
e114e473
CS
3733 .inode_alloc_security = smack_inode_alloc_security,
3734 .inode_free_security = smack_inode_free_security,
3735 .inode_init_security = smack_inode_init_security,
3736 .inode_link = smack_inode_link,
3737 .inode_unlink = smack_inode_unlink,
3738 .inode_rmdir = smack_inode_rmdir,
3739 .inode_rename = smack_inode_rename,
3740 .inode_permission = smack_inode_permission,
3741 .inode_setattr = smack_inode_setattr,
3742 .inode_getattr = smack_inode_getattr,
3743 .inode_setxattr = smack_inode_setxattr,
3744 .inode_post_setxattr = smack_inode_post_setxattr,
3745 .inode_getxattr = smack_inode_getxattr,
3746 .inode_removexattr = smack_inode_removexattr,
3747 .inode_getsecurity = smack_inode_getsecurity,
3748 .inode_setsecurity = smack_inode_setsecurity,
3749 .inode_listsecurity = smack_inode_listsecurity,
d20bdda6 3750 .inode_getsecid = smack_inode_getsecid,
e114e473
CS
3751
3752 .file_permission = smack_file_permission,
3753 .file_alloc_security = smack_file_alloc_security,
3754 .file_free_security = smack_file_free_security,
3755 .file_ioctl = smack_file_ioctl,
3756 .file_lock = smack_file_lock,
3757 .file_fcntl = smack_file_fcntl,
e5467859
AV
3758 .mmap_file = smack_mmap_file,
3759 .mmap_addr = cap_mmap_addr,
e114e473
CS
3760 .file_set_fowner = smack_file_set_fowner,
3761 .file_send_sigiotask = smack_file_send_sigiotask,
3762 .file_receive = smack_file_receive,
3763
83d49856 3764 .file_open = smack_file_open,
531f1d45 3765
ee18d64c 3766 .cred_alloc_blank = smack_cred_alloc_blank,
f1752eec 3767 .cred_free = smack_cred_free,
d84f4f99 3768 .cred_prepare = smack_cred_prepare,
ee18d64c 3769 .cred_transfer = smack_cred_transfer,
3a3b7ce9
DH
3770 .kernel_act_as = smack_kernel_act_as,
3771 .kernel_create_files_as = smack_kernel_create_files_as,
e114e473
CS
3772 .task_setpgid = smack_task_setpgid,
3773 .task_getpgid = smack_task_getpgid,
3774 .task_getsid = smack_task_getsid,
3775 .task_getsecid = smack_task_getsecid,
3776 .task_setnice = smack_task_setnice,
3777 .task_setioprio = smack_task_setioprio,
3778 .task_getioprio = smack_task_getioprio,
3779 .task_setscheduler = smack_task_setscheduler,
3780 .task_getscheduler = smack_task_getscheduler,
3781 .task_movememory = smack_task_movememory,
3782 .task_kill = smack_task_kill,
3783 .task_wait = smack_task_wait,
e114e473
CS
3784 .task_to_inode = smack_task_to_inode,
3785
3786 .ipc_permission = smack_ipc_permission,
d20bdda6 3787 .ipc_getsecid = smack_ipc_getsecid,
e114e473
CS
3788
3789 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3790 .msg_msg_free_security = smack_msg_msg_free_security,
3791
3792 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3793 .msg_queue_free_security = smack_msg_queue_free_security,
3794 .msg_queue_associate = smack_msg_queue_associate,
3795 .msg_queue_msgctl = smack_msg_queue_msgctl,
3796 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3797 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3798
3799 .shm_alloc_security = smack_shm_alloc_security,
3800 .shm_free_security = smack_shm_free_security,
3801 .shm_associate = smack_shm_associate,
3802 .shm_shmctl = smack_shm_shmctl,
3803 .shm_shmat = smack_shm_shmat,
3804
3805 .sem_alloc_security = smack_sem_alloc_security,
3806 .sem_free_security = smack_sem_free_security,
3807 .sem_associate = smack_sem_associate,
3808 .sem_semctl = smack_sem_semctl,
3809 .sem_semop = smack_sem_semop,
3810
e114e473
CS
3811 .d_instantiate = smack_d_instantiate,
3812
3813 .getprocattr = smack_getprocattr,
3814 .setprocattr = smack_setprocattr,
3815
3816 .unix_stream_connect = smack_unix_stream_connect,
3817 .unix_may_send = smack_unix_may_send,
3818
3819 .socket_post_create = smack_socket_post_create,
c6739443 3820 .socket_bind = smack_socket_bind,
6d3dc07c
CS
3821 .socket_connect = smack_socket_connect,
3822 .socket_sendmsg = smack_socket_sendmsg,
e114e473
CS
3823 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3824 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3825 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3826 .sk_alloc_security = smack_sk_alloc_security,
3827 .sk_free_security = smack_sk_free_security,
3828 .sock_graft = smack_sock_graft,
3829 .inet_conn_request = smack_inet_conn_request,
07feee8f 3830 .inet_csk_clone = smack_inet_csk_clone,
d20bdda6 3831
e114e473
CS
3832 /* key management security hooks */
3833#ifdef CONFIG_KEYS
3834 .key_alloc = smack_key_alloc,
3835 .key_free = smack_key_free,
3836 .key_permission = smack_key_permission,
3837#endif /* CONFIG_KEYS */
d20bdda6
AD
3838
3839 /* Audit hooks */
3840#ifdef CONFIG_AUDIT
3841 .audit_rule_init = smack_audit_rule_init,
3842 .audit_rule_known = smack_audit_rule_known,
3843 .audit_rule_match = smack_audit_rule_match,
3844 .audit_rule_free = smack_audit_rule_free,
3845#endif /* CONFIG_AUDIT */
3846
746df9b5 3847 .ismaclabel = smack_ismaclabel,
e114e473 3848 .secid_to_secctx = smack_secid_to_secctx,
4bc87e62 3849 .secctx_to_secid = smack_secctx_to_secid,
e114e473 3850 .release_secctx = smack_release_secctx,
1ee65e37
DQ
3851 .inode_notifysecctx = smack_inode_notifysecctx,
3852 .inode_setsecctx = smack_inode_setsecctx,
3853 .inode_getsecctx = smack_inode_getsecctx,
e114e473
CS
3854};
3855
7198e2ee 3856
86812bb0 3857static __init void init_smack_known_list(void)
7198e2ee 3858{
86812bb0
CS
3859 /*
3860 * Initialize rule list locks
3861 */
3862 mutex_init(&smack_known_huh.smk_rules_lock);
3863 mutex_init(&smack_known_hat.smk_rules_lock);
3864 mutex_init(&smack_known_floor.smk_rules_lock);
3865 mutex_init(&smack_known_star.smk_rules_lock);
3866 mutex_init(&smack_known_invalid.smk_rules_lock);
3867 mutex_init(&smack_known_web.smk_rules_lock);
3868 /*
3869 * Initialize rule lists
3870 */
3871 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3872 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3873 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3874 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3875 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3876 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3877 /*
3878 * Create the known labels list
3879 */
7198e2ee
EB
3880 list_add(&smack_known_huh.list, &smack_known_list);
3881 list_add(&smack_known_hat.list, &smack_known_list);
3882 list_add(&smack_known_star.list, &smack_known_list);
3883 list_add(&smack_known_floor.list, &smack_known_list);
3884 list_add(&smack_known_invalid.list, &smack_known_list);
3885 list_add(&smack_known_web.list, &smack_known_list);
3886}
3887
e114e473
CS
3888/**
3889 * smack_init - initialize the smack system
3890 *
3891 * Returns 0
3892 */
3893static __init int smack_init(void)
3894{
d84f4f99 3895 struct cred *cred;
676dac4b 3896 struct task_smack *tsp;
d84f4f99 3897
7898e1f8
CS
3898 if (!security_module_enable(&smack_ops))
3899 return 0;
3900
2f823ff8
CS
3901 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
3902 GFP_KERNEL);
676dac4b
CS
3903 if (tsp == NULL)
3904 return -ENOMEM;
3905
e114e473
CS
3906 printk(KERN_INFO "Smack: Initializing.\n");
3907
3908 /*
3909 * Set the security state for the initial task.
3910 */
d84f4f99 3911 cred = (struct cred *) current->cred;
676dac4b 3912 cred->security = tsp;
e114e473 3913
86812bb0
CS
3914 /* initialize the smack_known_list */
3915 init_smack_known_list();
e114e473
CS
3916
3917 /*
3918 * Register with LSM
3919 */
3920 if (register_security(&smack_ops))
3921 panic("smack: Unable to register with kernel.\n");
3922
3923 return 0;
3924}
3925
3926/*
3927 * Smack requires early initialization in order to label
3928 * all processes and objects when they are created.
3929 */
3930security_initcall(smack_init);
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