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LSM: separate LSM_AUDIT_DATA_DENTRY from LSM_AUDIT_DATA_PATH
[linux-2.6-block.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>
5c6d1125 8 * Jarkko Sakkinen <ext-jarkko.2.sakkinen@nokia.com>
e114e473
CS		 9 *
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
07feee8f
PM		 11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul.moore@hp.com>
5c6d1125 13 * Copyright (C) 2010 Nokia Corporation
e114e473
CS		 14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2,
17 * as published by the Free Software Foundation.
18 */
19
20#include <linux/xattr.h>
21#include <linux/pagemap.h>
22#include <linux/mount.h>
23#include <linux/stat.h>
e114e473
CS		 24#include <linux/kd.h>
25#include <asm/ioctls.h>
07feee8f 26#include <linux/ip.h>
e114e473
CS		 27#include <linux/tcp.h>
28#include <linux/udp.h>
5a0e3ad6 29#include <linux/slab.h>
e114e473
CS		 30#include <linux/mutex.h>
31#include <linux/pipe_fs_i.h>
32#include <net/netlabel.h>
33#include <net/cipso_ipv4.h>
d20bdda6 34#include <linux/audit.h>
1fd7317d 35#include <linux/magic.h>
2a7dba39 36#include <linux/dcache.h>
e114e473
CS		 37#include "smack.h"
38
c69e8d9c
DH		 39#define task_security(task) (task_cred_xxx((task), security))
40
5c6d1125
JS		 41#define TRANS_TRUE "TRUE"
42#define TRANS_TRUE_SIZE 4
43
e114e473
CS		 44/**
45 * smk_fetch - Fetch the smack label from a file.
46 * @ip: a pointer to the inode
47 * @dp: a pointer to the dentry
48 *
49 * Returns a pointer to the master list entry for the Smack label
50 * or NULL if there was no label to fetch.
51 */
676dac4b 52static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
e114e473
CS		 53{
54 int rc;
55 char in[SMK_LABELLEN];
56
57 if (ip->i_op->getxattr == NULL)
58 return NULL;
59
676dac4b 60 rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
e114e473
CS		 61 if (rc < 0)
62 return NULL;
63
64 return smk_import(in, rc);
65}
66
67/**
68 * new_inode_smack - allocate an inode security blob
69 * @smack: a pointer to the Smack label to use in the blob
70 *
71 * Returns the new blob or NULL if there's no memory available
72 */
73struct inode_smack *new_inode_smack(char *smack)
74{
75 struct inode_smack *isp;
76
77 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
78 if (isp == NULL)
79 return NULL;
80
81 isp->smk_inode = smack;
82 isp->smk_flags = 0;
83 mutex_init(&isp->smk_lock);
84
85 return isp;
86}
87
7898e1f8
CS		 88/**
89 * new_task_smack - allocate a task 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 */
94static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
95{
96 struct task_smack *tsp;
97
98 tsp = kzalloc(sizeof(struct task_smack), gfp);
99 if (tsp == NULL)
100 return NULL;
101
102 tsp->smk_task = task;
103 tsp->smk_forked = forked;
104 INIT_LIST_HEAD(&tsp->smk_rules);
105 mutex_init(&tsp->smk_rules_lock);
106
107 return tsp;
108}
109
110/**
111 * smk_copy_rules - copy a rule set
112 * @nhead - new rules header pointer
113 * @ohead - old rules header pointer
114 *
115 * Returns 0 on success, -ENOMEM on error
116 */
117static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
118 gfp_t gfp)
119{
120 struct smack_rule *nrp;
121 struct smack_rule *orp;
122 int rc = 0;
123
124 INIT_LIST_HEAD(nhead);
125
126 list_for_each_entry_rcu(orp, ohead, list) {
127 nrp = kzalloc(sizeof(struct smack_rule), gfp);
128 if (nrp == NULL) {
129 rc = -ENOMEM;
130 break;
131 }
132 *nrp = *orp;
133 list_add_rcu(&nrp->list, nhead);
134 }
135 return rc;
136}
137
e114e473
CS		 138/*
139 * LSM hooks.
140 * We he, that is fun!
141 */
142
143/**
9e48858f 144 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
e114e473 145 * @ctp: child task pointer
251a2a95 146 * @mode: ptrace attachment mode
e114e473
CS		 147 *
148 * Returns 0 if access is OK, an error code otherwise
149 *
150 * Do the capability checks, and require read and write.
151 */
9e48858f 152static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
e114e473
CS		 153{
154 int rc;
ecfcc53f 155 struct smk_audit_info ad;
7898e1f8 156 char *tsp;
e114e473 157
9e48858f 158 rc = cap_ptrace_access_check(ctp, mode);
e114e473
CS		 159 if (rc != 0)
160 return rc;
161
676dac4b 162 tsp = smk_of_task(task_security(ctp));
ecfcc53f
EB		 163 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
164 smk_ad_setfield_u_tsk(&ad, ctp);
165
7898e1f8 166 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
5cd9c58f
DH		 167 return rc;
168}
169
170/**
171 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
172 * @ptp: parent task pointer
173 *
174 * Returns 0 if access is OK, an error code otherwise
175 *
176 * Do the capability checks, and require read and write.
177 */
178static int smack_ptrace_traceme(struct task_struct *ptp)
179{
180 int rc;
ecfcc53f 181 struct smk_audit_info ad;
7898e1f8 182 char *tsp;
5cd9c58f
DH		 183
184 rc = cap_ptrace_traceme(ptp);
185 if (rc != 0)
186 return rc;
e114e473 187
7898e1f8 188 tsp = smk_of_task(task_security(ptp));
ecfcc53f
EB		 189 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
190 smk_ad_setfield_u_tsk(&ad, ptp);
191
7898e1f8 192 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
e114e473
CS		 193 return rc;
194}
195
196/**
197 * smack_syslog - Smack approval on syslog
198 * @type: message type
199 *
200 * Require that the task has the floor label
201 *
202 * Returns 0 on success, error code otherwise.
203 */
12b3052c 204static int smack_syslog(int typefrom_file)
e114e473 205{
12b3052c 206 int rc = 0;
676dac4b 207 char *sp = smk_of_current();
e114e473 208
e114e473
CS		 209 if (capable(CAP_MAC_OVERRIDE))
210 return 0;
211
212 if (sp != smack_known_floor.smk_known)
213 rc = -EACCES;
214
215 return rc;
216}
217
218
219/*
220 * Superblock Hooks.
221 */
222
223/**
224 * smack_sb_alloc_security - allocate a superblock blob
225 * @sb: the superblock getting the blob
226 *
227 * Returns 0 on success or -ENOMEM on error.
228 */
229static int smack_sb_alloc_security(struct super_block *sb)
230{
231 struct superblock_smack *sbsp;
232
233 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
234
235 if (sbsp == NULL)
236 return -ENOMEM;
237
238 sbsp->smk_root = smack_known_floor.smk_known;
239 sbsp->smk_default = smack_known_floor.smk_known;
240 sbsp->smk_floor = smack_known_floor.smk_known;
241 sbsp->smk_hat = smack_known_hat.smk_known;
242 sbsp->smk_initialized = 0;
243 spin_lock_init(&sbsp->smk_sblock);
244
245 sb->s_security = sbsp;
246
247 return 0;
248}
249
250/**
251 * smack_sb_free_security - free a superblock blob
252 * @sb: the superblock getting the blob
253 *
254 */
255static void smack_sb_free_security(struct super_block *sb)
256{
257 kfree(sb->s_security);
258 sb->s_security = NULL;
259}
260
261/**
262 * smack_sb_copy_data - copy mount options data for processing
e114e473 263 * @orig: where to start
251a2a95 264 * @smackopts: mount options string
e114e473
CS		 265 *
266 * Returns 0 on success or -ENOMEM on error.
267 *
268 * Copy the Smack specific mount options out of the mount
269 * options list.
270 */
e0007529 271static int smack_sb_copy_data(char *orig, char *smackopts)
e114e473
CS		 272{
273 char *cp, *commap, *otheropts, *dp;
274
e114e473
CS		 275 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
276 if (otheropts == NULL)
277 return -ENOMEM;
278
279 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
280 if (strstr(cp, SMK_FSDEFAULT) == cp)
281 dp = smackopts;
282 else if (strstr(cp, SMK_FSFLOOR) == cp)
283 dp = smackopts;
284 else if (strstr(cp, SMK_FSHAT) == cp)
285 dp = smackopts;
286 else if (strstr(cp, SMK_FSROOT) == cp)
287 dp = smackopts;
288 else
289 dp = otheropts;
290
291 commap = strchr(cp, ',');
292 if (commap != NULL)
293 *commap = '\0';
294
295 if (*dp != '\0')
296 strcat(dp, ",");
297 strcat(dp, cp);
298 }
299
300 strcpy(orig, otheropts);
301 free_page((unsigned long)otheropts);
302
303 return 0;
304}
305
306/**
307 * smack_sb_kern_mount - Smack specific mount processing
308 * @sb: the file system superblock
12204e24 309 * @flags: the mount flags
e114e473
CS		 310 * @data: the smack mount options
311 *
312 * Returns 0 on success, an error code on failure
313 */
12204e24 314static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
e114e473
CS		 315{
316 struct dentry *root = sb->s_root;
317 struct inode *inode = root->d_inode;
318 struct superblock_smack *sp = sb->s_security;
319 struct inode_smack *isp;
320 char *op;
321 char *commap;
322 char *nsp;
323
324 spin_lock(&sp->smk_sblock);
325 if (sp->smk_initialized != 0) {
326 spin_unlock(&sp->smk_sblock);
327 return 0;
328 }
329 sp->smk_initialized = 1;
330 spin_unlock(&sp->smk_sblock);
331
332 for (op = data; op != NULL; op = commap) {
333 commap = strchr(op, ',');
334 if (commap != NULL)
335 *commap++ = '\0';
336
337 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
338 op += strlen(SMK_FSHAT);
339 nsp = smk_import(op, 0);
340 if (nsp != NULL)
341 sp->smk_hat = nsp;
342 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
343 op += strlen(SMK_FSFLOOR);
344 nsp = smk_import(op, 0);
345 if (nsp != NULL)
346 sp->smk_floor = nsp;
347 } else if (strncmp(op, SMK_FSDEFAULT,
348 strlen(SMK_FSDEFAULT)) == 0) {
349 op += strlen(SMK_FSDEFAULT);
350 nsp = smk_import(op, 0);
351 if (nsp != NULL)
352 sp->smk_default = nsp;
353 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
354 op += strlen(SMK_FSROOT);
355 nsp = smk_import(op, 0);
356 if (nsp != NULL)
357 sp->smk_root = nsp;
358 }
359 }
360
361 /*
362 * Initialize the root inode.
363 */
364 isp = inode->i_security;
365 if (isp == NULL)
366 inode->i_security = new_inode_smack(sp->smk_root);
367 else
368 isp->smk_inode = sp->smk_root;
369
370 return 0;
371}
372
373/**
374 * smack_sb_statfs - Smack check on statfs
375 * @dentry: identifies the file system in question
376 *
377 * Returns 0 if current can read the floor of the filesystem,
378 * and error code otherwise
379 */
380static int smack_sb_statfs(struct dentry *dentry)
381{
382 struct superblock_smack *sbp = dentry->d_sb->s_security;
ecfcc53f
EB		 383 int rc;
384 struct smk_audit_info ad;
385
a269434d 386 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 387 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 388
ecfcc53f
EB		 389 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
390 return rc;
e114e473
CS		 391}
392
393/**
394 * smack_sb_mount - Smack check for mounting
395 * @dev_name: unused
251a2a95 396 * @path: mount point
e114e473
CS		 397 * @type: unused
398 * @flags: unused
399 * @data: unused
400 *
401 * Returns 0 if current can write the floor of the filesystem
402 * being mounted on, an error code otherwise.
403 */
b5266eb4 404static int smack_sb_mount(char *dev_name, struct path *path,
e114e473
CS		 405 char *type, unsigned long flags, void *data)
406{
b5266eb4 407 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
ecfcc53f 408 struct smk_audit_info ad;
e114e473 409
f48b7399 410 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f
EB		 411 smk_ad_setfield_u_fs_path(&ad, *path);
412
413 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
e114e473
CS		 414}
415
416/**
417 * smack_sb_umount - Smack check for unmounting
418 * @mnt: file system to unmount
419 * @flags: unused
420 *
421 * Returns 0 if current can write the floor of the filesystem
422 * being unmounted, an error code otherwise.
423 */
424static int smack_sb_umount(struct vfsmount *mnt, int flags)
425{
426 struct superblock_smack *sbp;
ecfcc53f 427 struct smk_audit_info ad;
a269434d
EP		 428 struct path path;
429
430 path.dentry = mnt->mnt_root;
431 path.mnt = mnt;
e114e473 432
f48b7399 433 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
a269434d 434 smk_ad_setfield_u_fs_path(&ad, path);
e114e473 435
ecfcc53f
EB		 436 sbp = mnt->mnt_sb->s_security;
437 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
e114e473
CS		 438}
439
676dac4b
CS		 440/*
441 * BPRM hooks
442 */
443
444static int smack_bprm_set_creds(struct linux_binprm *bprm)
445{
446 struct task_smack *tsp = bprm->cred->security;
447 struct inode_smack *isp;
448 struct dentry *dp;
449 int rc;
450
451 rc = cap_bprm_set_creds(bprm);
452 if (rc != 0)
453 return rc;
454
455 if (bprm->cred_prepared)
456 return 0;
457
458 if (bprm->file == NULL || bprm->file->f_dentry == NULL)
459 return 0;
460
461 dp = bprm->file->f_dentry;
462
463 if (dp->d_inode == NULL)
464 return 0;
465
466 isp = dp->d_inode->i_security;
467
468 if (isp->smk_task != NULL)
469 tsp->smk_task = isp->smk_task;
470
471 return 0;
472}
473
e114e473
CS		 474/*
475 * Inode hooks
476 */
477
478/**
479 * smack_inode_alloc_security - allocate an inode blob
251a2a95 480 * @inode: the inode in need of a blob
e114e473
CS		 481 *
482 * Returns 0 if it gets a blob, -ENOMEM otherwise
483 */
484static int smack_inode_alloc_security(struct inode *inode)
485{
676dac4b 486 inode->i_security = new_inode_smack(smk_of_current());
e114e473
CS		 487 if (inode->i_security == NULL)
488 return -ENOMEM;
489 return 0;
490}
491
492/**
493 * smack_inode_free_security - free an inode blob
251a2a95 494 * @inode: the inode with a blob
e114e473
CS		 495 *
496 * Clears the blob pointer in inode
497 */
498static void smack_inode_free_security(struct inode *inode)
499{
500 kfree(inode->i_security);
501 inode->i_security = NULL;
502}
503
504/**
505 * smack_inode_init_security - copy out the smack from an inode
506 * @inode: the inode
507 * @dir: unused
2a7dba39 508 * @qstr: unused
e114e473
CS		 509 * @name: where to put the attribute name
510 * @value: where to put the attribute value
511 * @len: where to put the length of the attribute
512 *
513 * Returns 0 if it all works out, -ENOMEM if there's no memory
514 */
515static int smack_inode_init_security(struct inode *inode, struct inode *dir,
2a7dba39
EP		 516 const struct qstr *qstr, char **name,
517 void **value, size_t *len)
e114e473
CS		 518{
519 char *isp = smk_of_inode(inode);
5c6d1125 520 char *dsp = smk_of_inode(dir);
7898e1f8 521 int may;
e114e473
CS		 522
523 if (name) {
524 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
525 if (*name == NULL)
526 return -ENOMEM;
527 }
528
529 if (value) {
7898e1f8
CS		 530 rcu_read_lock();
531 may = smk_access_entry(smk_of_current(), dsp, &smack_rule_list);
532 rcu_read_unlock();
5c6d1125
JS		 533
534 /*
535 * If the access rule allows transmutation and
536 * the directory requests transmutation then
537 * by all means transmute.
538 */
7898e1f8
CS		 539 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
540 smk_inode_transmutable(dir))
5c6d1125
JS		 541 isp = dsp;
542
e114e473
CS		 543 *value = kstrdup(isp, GFP_KERNEL);
544 if (*value == NULL)
545 return -ENOMEM;
546 }
547
548 if (len)
549 *len = strlen(isp) + 1;
550
551 return 0;
552}
553
554/**
555 * smack_inode_link - Smack check on link
556 * @old_dentry: the existing object
557 * @dir: unused
558 * @new_dentry: the new object
559 *
560 * Returns 0 if access is permitted, an error code otherwise
561 */
562static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
563 struct dentry *new_dentry)
564{
e114e473 565 char *isp;
ecfcc53f
EB		 566 struct smk_audit_info ad;
567 int rc;
568
a269434d 569 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 570 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473
CS		 571
572 isp = smk_of_inode(old_dentry->d_inode);
ecfcc53f 573 rc = smk_curacc(isp, MAY_WRITE, &ad);
e114e473
CS		 574
575 if (rc == 0 && new_dentry->d_inode != NULL) {
576 isp = smk_of_inode(new_dentry->d_inode);
ecfcc53f
EB		 577 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
578 rc = smk_curacc(isp, MAY_WRITE, &ad);
e114e473
CS		 579 }
580
581 return rc;
582}
583
584/**
585 * smack_inode_unlink - Smack check on inode deletion
586 * @dir: containing directory object
587 * @dentry: file to unlink
588 *
589 * Returns 0 if current can write the containing directory
590 * and the object, error code otherwise
591 */
592static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
593{
594 struct inode *ip = dentry->d_inode;
ecfcc53f 595 struct smk_audit_info ad;
e114e473
CS		 596 int rc;
597
a269434d 598 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 599 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
600
e114e473
CS		 601 /*
602 * You need write access to the thing you're unlinking
603 */
ecfcc53f
EB		 604 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
605 if (rc == 0) {
e114e473
CS		 606 /*
607 * You also need write access to the containing directory
608 */
ecfcc53f
EB		 609 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
610 smk_ad_setfield_u_fs_inode(&ad, dir);
611 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
612 }
e114e473
CS		 613 return rc;
614}
615
616/**
617 * smack_inode_rmdir - Smack check on directory deletion
618 * @dir: containing directory object
619 * @dentry: directory to unlink
620 *
621 * Returns 0 if current can write the containing directory
622 * and the directory, error code otherwise
623 */
624static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
625{
ecfcc53f 626 struct smk_audit_info ad;
e114e473
CS		 627 int rc;
628
a269434d 629 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 630 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
631
e114e473
CS		 632 /*
633 * You need write access to the thing you're removing
634 */
ecfcc53f
EB		 635 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
636 if (rc == 0) {
e114e473
CS		 637 /*
638 * You also need write access to the containing directory
639 */
ecfcc53f
EB		 640 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
641 smk_ad_setfield_u_fs_inode(&ad, dir);
642 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
643 }
e114e473
CS		 644
645 return rc;
646}
647
648/**
649 * smack_inode_rename - Smack check on rename
650 * @old_inode: the old directory
651 * @old_dentry: unused
652 * @new_inode: the new directory
653 * @new_dentry: unused
654 *
655 * Read and write access is required on both the old and
656 * new directories.
657 *
658 * Returns 0 if access is permitted, an error code otherwise
659 */
660static int smack_inode_rename(struct inode *old_inode,
661 struct dentry *old_dentry,
662 struct inode *new_inode,
663 struct dentry *new_dentry)
664{
665 int rc;
666 char *isp;
ecfcc53f
EB		 667 struct smk_audit_info ad;
668
a269434d 669 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 670 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
e114e473
CS		 671
672 isp = smk_of_inode(old_dentry->d_inode);
ecfcc53f 673 rc = smk_curacc(isp, MAY_READWRITE, &ad);
e114e473
CS		 674
675 if (rc == 0 && new_dentry->d_inode != NULL) {
676 isp = smk_of_inode(new_dentry->d_inode);
ecfcc53f
EB		 677 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
678 rc = smk_curacc(isp, MAY_READWRITE, &ad);
e114e473 679 }
e114e473
CS		 680 return rc;
681}
682
683/**
684 * smack_inode_permission - Smack version of permission()
685 * @inode: the inode in question
686 * @mask: the access requested
e114e473
CS		 687 *
688 * This is the important Smack hook.
689 *
690 * Returns 0 if access is permitted, -EACCES otherwise
691 */
1c990429 692static int smack_inode_permission(struct inode *inode, int mask, unsigned flags)
e114e473 693{
ecfcc53f 694 struct smk_audit_info ad;
d09ca739
EP		 695
696 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
e114e473
CS		 697 /*
698 * No permission to check. Existence test. Yup, it's there.
699 */
700 if (mask == 0)
701 return 0;
1c990429
AK		 702
703 /* May be droppable after audit */
704 if (flags & IPERM_FLAG_RCU)
705 return -ECHILD;
f48b7399 706 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
ecfcc53f
EB		 707 smk_ad_setfield_u_fs_inode(&ad, inode);
708 return smk_curacc(smk_of_inode(inode), mask, &ad);
e114e473
CS		 709}
710
711/**
712 * smack_inode_setattr - Smack check for setting attributes
713 * @dentry: the object
714 * @iattr: for the force flag
715 *
716 * Returns 0 if access is permitted, an error code otherwise
717 */
718static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
719{
ecfcc53f 720 struct smk_audit_info ad;
e114e473
CS		 721 /*
722 * Need to allow for clearing the setuid bit.
723 */
724 if (iattr->ia_valid & ATTR_FORCE)
725 return 0;
a269434d 726 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 727 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
e114e473 728
ecfcc53f 729 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
e114e473
CS		 730}
731
732/**
733 * smack_inode_getattr - Smack check for getting attributes
734 * @mnt: unused
735 * @dentry: the object
736 *
737 * Returns 0 if access is permitted, an error code otherwise
738 */
739static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
740{
ecfcc53f 741 struct smk_audit_info ad;
a269434d
EP		 742 struct path path;
743
744 path.dentry = dentry;
745 path.mnt = mnt;
ecfcc53f 746
f48b7399 747 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
a269434d 748 smk_ad_setfield_u_fs_path(&ad, path);
ecfcc53f 749 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
e114e473
CS		 750}
751
752/**
753 * smack_inode_setxattr - Smack check for setting xattrs
754 * @dentry: the object
755 * @name: name of the attribute
756 * @value: unused
757 * @size: unused
758 * @flags: unused
759 *
760 * This protects the Smack attribute explicitly.
761 *
762 * Returns 0 if access is permitted, an error code otherwise
763 */
8f0cfa52
DH		 764static int smack_inode_setxattr(struct dentry *dentry, const char *name,
765 const void *value, size_t size, int flags)
e114e473 766{
ecfcc53f 767 struct smk_audit_info ad;
bcdca225 768 int rc = 0;
e114e473 769
bcdca225
CS		 770 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
771 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 772 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
7898e1f8
CS		 773 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
774 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
bcdca225
CS		 775 if (!capable(CAP_MAC_ADMIN))
776 rc = -EPERM;
defc433b
EB		 777 /*
778 * check label validity here so import wont fail on
779 * post_setxattr
780 */
781 if (size == 0 || size >= SMK_LABELLEN ||
782 smk_import(value, size) == NULL)
4303154e 783 rc = -EINVAL;
5c6d1125
JS		 784 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
785 if (!capable(CAP_MAC_ADMIN))
786 rc = -EPERM;
787 if (size != TRANS_TRUE_SIZE ||
788 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
789 rc = -EINVAL;
bcdca225
CS		 790 } else
791 rc = cap_inode_setxattr(dentry, name, value, size, flags);
792
a269434d 793 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 794 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
795
bcdca225 796 if (rc == 0)
ecfcc53f 797 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
bcdca225
CS		 798
799 return rc;
e114e473
CS		 800}
801
802/**
803 * smack_inode_post_setxattr - Apply the Smack update approved above
804 * @dentry: object
805 * @name: attribute name
806 * @value: attribute value
807 * @size: attribute size
808 * @flags: unused
809 *
810 * Set the pointer in the inode blob to the entry found
811 * in the master label list.
812 */
8f0cfa52
DH		 813static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
814 const void *value, size_t size, int flags)
e114e473 815{
e114e473 816 char *nsp;
5c6d1125 817 struct inode_smack *isp = dentry->d_inode->i_security;
676dac4b
CS		 818
819 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
5c6d1125 820 nsp = smk_import(value, size);
676dac4b
CS		 821 if (nsp != NULL)
822 isp->smk_inode = nsp;
823 else
824 isp->smk_inode = smack_known_invalid.smk_known;
5c6d1125
JS		 825 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
826 nsp = smk_import(value, size);
676dac4b
CS		 827 if (nsp != NULL)
828 isp->smk_task = nsp;
829 else
830 isp->smk_task = smack_known_invalid.smk_known;
7898e1f8
CS		 831 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
832 nsp = smk_import(value, size);
833 if (nsp != NULL)
834 isp->smk_mmap = nsp;
835 else
836 isp->smk_mmap = smack_known_invalid.smk_known;
5c6d1125
JS		 837 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
838 isp->smk_flags |= SMK_INODE_TRANSMUTE;
e114e473
CS		 839
840 return;
841}
842
843/*
844 * smack_inode_getxattr - Smack check on getxattr
845 * @dentry: the object
846 * @name: unused
847 *
848 * Returns 0 if access is permitted, an error code otherwise
849 */
8f0cfa52 850static int smack_inode_getxattr(struct dentry *dentry, const char *name)
e114e473 851{
ecfcc53f
EB		 852 struct smk_audit_info ad;
853
a269434d 854 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 855 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
856
857 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
e114e473
CS		 858}
859
860/*
861 * smack_inode_removexattr - Smack check on removexattr
862 * @dentry: the object
863 * @name: name of the attribute
864 *
865 * Removing the Smack attribute requires CAP_MAC_ADMIN
866 *
867 * Returns 0 if access is permitted, an error code otherwise
868 */
8f0cfa52 869static int smack_inode_removexattr(struct dentry *dentry, const char *name)
e114e473 870{
676dac4b 871 struct inode_smack *isp;
ecfcc53f 872 struct smk_audit_info ad;
bcdca225 873 int rc = 0;
e114e473 874
bcdca225
CS		 875 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
876 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
676dac4b 877 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
5c6d1125 878 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
7898e1f8
CS		 879 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
880 strcmp(name, XATTR_NAME_SMACKMMAP)) {
bcdca225
CS		 881 if (!capable(CAP_MAC_ADMIN))
882 rc = -EPERM;
883 } else
884 rc = cap_inode_removexattr(dentry, name);
885
a269434d 886 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f 887 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
bcdca225 888 if (rc == 0)
ecfcc53f 889 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
bcdca225 890
676dac4b
CS		 891 if (rc == 0) {
892 isp = dentry->d_inode->i_security;
893 isp->smk_task = NULL;
7898e1f8 894 isp->smk_mmap = NULL;
676dac4b
CS		 895 }
896
bcdca225 897 return rc;
e114e473
CS		 898}
899
900/**
901 * smack_inode_getsecurity - get smack xattrs
902 * @inode: the object
903 * @name: attribute name
904 * @buffer: where to put the result
251a2a95 905 * @alloc: unused
e114e473
CS		 906 *
907 * Returns the size of the attribute or an error code
908 */
909static int smack_inode_getsecurity(const struct inode *inode,
910 const char *name, void **buffer,
911 bool alloc)
912{
913 struct socket_smack *ssp;
914 struct socket *sock;
915 struct super_block *sbp;
916 struct inode *ip = (struct inode *)inode;
917 char *isp;
918 int ilen;
919 int rc = 0;
920
921 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
922 isp = smk_of_inode(inode);
923 ilen = strlen(isp) + 1;
924 *buffer = isp;
925 return ilen;
926 }
927
928 /*
929 * The rest of the Smack xattrs are only on sockets.
930 */
931 sbp = ip->i_sb;
932 if (sbp->s_magic != SOCKFS_MAGIC)
933 return -EOPNOTSUPP;
934
935 sock = SOCKET_I(ip);
2e1d146a 936 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 937 return -EOPNOTSUPP;
938
939 ssp = sock->sk->sk_security;
940
941 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
942 isp = ssp->smk_in;
943 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
944 isp = ssp->smk_out;
945 else
946 return -EOPNOTSUPP;
947
948 ilen = strlen(isp) + 1;
949 if (rc == 0) {
950 *buffer = isp;
951 rc = ilen;
952 }
953
954 return rc;
955}
956
957
958/**
959 * smack_inode_listsecurity - list the Smack attributes
960 * @inode: the object
961 * @buffer: where they go
962 * @buffer_size: size of buffer
963 *
964 * Returns 0 on success, -EINVAL otherwise
965 */
966static int smack_inode_listsecurity(struct inode *inode, char *buffer,
967 size_t buffer_size)
968{
969 int len = strlen(XATTR_NAME_SMACK);
970
971 if (buffer != NULL && len <= buffer_size) {
972 memcpy(buffer, XATTR_NAME_SMACK, len);
973 return len;
974 }
975 return -EINVAL;
976}
977
d20bdda6
AD		 978/**
979 * smack_inode_getsecid - Extract inode's security id
980 * @inode: inode to extract the info from
981 * @secid: where result will be saved
982 */
983static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
984{
985 struct inode_smack *isp = inode->i_security;
986
987 *secid = smack_to_secid(isp->smk_inode);
988}
989
e114e473
CS		 990/*
991 * File Hooks
992 */
993
994/**
995 * smack_file_permission - Smack check on file operations
996 * @file: unused
997 * @mask: unused
998 *
999 * Returns 0
1000 *
1001 * Should access checks be done on each read or write?
1002 * UNICOS and SELinux say yes.
1003 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1004 *
1005 * I'll say no for now. Smack does not do the frequent
1006 * label changing that SELinux does.
1007 */
1008static int smack_file_permission(struct file *file, int mask)
1009{
1010 return 0;
1011}
1012
1013/**
1014 * smack_file_alloc_security - assign a file security blob
1015 * @file: the object
1016 *
1017 * The security blob for a file is a pointer to the master
1018 * label list, so no allocation is done.
1019 *
1020 * Returns 0
1021 */
1022static int smack_file_alloc_security(struct file *file)
1023{
676dac4b 1024 file->f_security = smk_of_current();
e114e473
CS		 1025 return 0;
1026}
1027
1028/**
1029 * smack_file_free_security - clear a file security blob
1030 * @file: the object
1031 *
1032 * The security blob for a file is a pointer to the master
1033 * label list, so no memory is freed.
1034 */
1035static void smack_file_free_security(struct file *file)
1036{
1037 file->f_security = NULL;
1038}
1039
1040/**
1041 * smack_file_ioctl - Smack check on ioctls
1042 * @file: the object
1043 * @cmd: what to do
1044 * @arg: unused
1045 *
1046 * Relies heavily on the correct use of the ioctl command conventions.
1047 *
1048 * Returns 0 if allowed, error code otherwise
1049 */
1050static int smack_file_ioctl(struct file *file, unsigned int cmd,
1051 unsigned long arg)
1052{
1053 int rc = 0;
ecfcc53f
EB		 1054 struct smk_audit_info ad;
1055
f48b7399 1056 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f 1057 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473
CS		 1058
1059 if (_IOC_DIR(cmd) & _IOC_WRITE)
ecfcc53f 1060 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS		 1061
1062 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
ecfcc53f 1063 rc = smk_curacc(file->f_security, MAY_READ, &ad);
e114e473
CS		 1064
1065 return rc;
1066}
1067
1068/**
1069 * smack_file_lock - Smack check on file locking
1070 * @file: the object
251a2a95 1071 * @cmd: unused
e114e473
CS		 1072 *
1073 * Returns 0 if current has write access, error code otherwise
1074 */
1075static int smack_file_lock(struct file *file, unsigned int cmd)
1076{
ecfcc53f
EB		 1077 struct smk_audit_info ad;
1078
a269434d 1079 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
ecfcc53f
EB		 1080 smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry);
1081 return smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS		 1082}
1083
1084/**
1085 * smack_file_fcntl - Smack check on fcntl
1086 * @file: the object
1087 * @cmd: what action to check
1088 * @arg: unused
1089 *
1090 * Returns 0 if current has access, error code otherwise
1091 */
1092static int smack_file_fcntl(struct file *file, unsigned int cmd,
1093 unsigned long arg)
1094{
ecfcc53f 1095 struct smk_audit_info ad;
e114e473
CS		 1096 int rc;
1097
f48b7399 1098 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
ecfcc53f
EB		 1099 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1100
e114e473
CS		 1101 switch (cmd) {
1102 case F_DUPFD:
1103 case F_GETFD:
1104 case F_GETFL:
1105 case F_GETLK:
1106 case F_GETOWN:
1107 case F_GETSIG:
ecfcc53f 1108 rc = smk_curacc(file->f_security, MAY_READ, &ad);
e114e473
CS		 1109 break;
1110 case F_SETFD:
1111 case F_SETFL:
1112 case F_SETLK:
1113 case F_SETLKW:
1114 case F_SETOWN:
1115 case F_SETSIG:
ecfcc53f 1116 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
e114e473
CS		 1117 break;
1118 default:
ecfcc53f 1119 rc = smk_curacc(file->f_security, MAY_READWRITE, &ad);
e114e473
CS		 1120 }
1121
1122 return rc;
1123}
1124
7898e1f8
CS		 1125/**
1126 * smack_file_mmap :
1127 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1128 * if mapping anonymous memory.
1129 * @file contains the file structure for file to map (may be NULL).
1130 * @reqprot contains the protection requested by the application.
1131 * @prot contains the protection that will be applied by the kernel.
1132 * @flags contains the operational flags.
1133 * Return 0 if permission is granted.
1134 */
1135static int smack_file_mmap(struct file *file,
1136 unsigned long reqprot, unsigned long prot,
1137 unsigned long flags, unsigned long addr,
1138 unsigned long addr_only)
1139{
1140 struct smack_rule *srp;
1141 struct task_smack *tsp;
1142 char *sp;
1143 char *msmack;
0e0a070d 1144 char *osmack;
7898e1f8
CS		 1145 struct inode_smack *isp;
1146 struct dentry *dp;
0e0a070d
CS		 1147 int may;
1148 int mmay;
1149 int tmay;
7898e1f8
CS		 1150 int rc;
1151
1152 /* do DAC check on address space usage */
1153 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1154 if (rc || addr_only)
1155 return rc;
1156
1157 if (file == NULL || file->f_dentry == NULL)
1158 return 0;
1159
1160 dp = file->f_dentry;
1161
1162 if (dp->d_inode == NULL)
1163 return 0;
1164
1165 isp = dp->d_inode->i_security;
1166 if (isp->smk_mmap == NULL)
1167 return 0;
1168 msmack = isp->smk_mmap;
1169
1170 tsp = current_security();
1171 sp = smk_of_current();
1172 rc = 0;
1173
1174 rcu_read_lock();
1175 /*
1176 * For each Smack rule associated with the subject
1177 * label verify that the SMACK64MMAP also has access
1178 * to that rule's object label.
1179 *
1180 * Because neither of the labels comes
1181 * from the networking code it is sufficient
1182 * to compare pointers.
1183 */
1184 list_for_each_entry_rcu(srp, &smack_rule_list, list) {
1185 if (srp->smk_subject != sp)
1186 continue;
0e0a070d
CS		 1187
1188 osmack = srp->smk_object;
7898e1f8
CS		 1189 /*
1190 * Matching labels always allows access.
1191 */
0e0a070d 1192 if (msmack == osmack)
7898e1f8 1193 continue;
0e0a070d
CS		 1194 /*
1195 * If there is a matching local rule take
1196 * that into account as well.
1197 */
1198 may = smk_access_entry(srp->smk_subject, osmack,
1199 &tsp->smk_rules);
1200 if (may == -ENOENT)
1201 may = srp->smk_access;
1202 else
1203 may &= srp->smk_access;
1204 /*
1205 * If may is zero the SMACK64MMAP subject can't
1206 * possibly have less access.
1207 */
1208 if (may == 0)
1209 continue;
1210
1211 /*
1212 * Fetch the global list entry.
1213 * If there isn't one a SMACK64MMAP subject
1214 * can't have as much access as current.
1215 */
1216 mmay = smk_access_entry(msmack, osmack, &smack_rule_list);
1217 if (mmay == -ENOENT) {
1218 rc = -EACCES;
1219 break;
1220 }
1221 /*
1222 * If there is a local entry it modifies the
1223 * potential access, too.
1224 */
1225 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1226 if (tmay != -ENOENT)
1227 mmay &= tmay;
7898e1f8 1228
0e0a070d
CS		 1229 /*
1230 * If there is any access available to current that is
1231 * not available to a SMACK64MMAP subject
1232 * deny access.
1233 */
75a25637 1234 if ((may | mmay) != mmay) {
0e0a070d 1235 rc = -EACCES;
7898e1f8 1236 break;
0e0a070d 1237 }
7898e1f8
CS		 1238 }
1239
1240 rcu_read_unlock();
1241
1242 return rc;
1243}
1244
e114e473
CS		 1245/**
1246 * smack_file_set_fowner - set the file security blob value
1247 * @file: object in question
1248 *
1249 * Returns 0
1250 * Further research may be required on this one.
1251 */
1252static int smack_file_set_fowner(struct file *file)
1253{
676dac4b 1254 file->f_security = smk_of_current();
e114e473
CS		 1255 return 0;
1256}
1257
1258/**
1259 * smack_file_send_sigiotask - Smack on sigio
1260 * @tsk: The target task
1261 * @fown: the object the signal come from
1262 * @signum: unused
1263 *
1264 * Allow a privileged task to get signals even if it shouldn't
1265 *
1266 * Returns 0 if a subject with the object's smack could
1267 * write to the task, an error code otherwise.
1268 */
1269static int smack_file_send_sigiotask(struct task_struct *tsk,
1270 struct fown_struct *fown, int signum)
1271{
1272 struct file *file;
1273 int rc;
676dac4b 1274 char *tsp = smk_of_task(tsk->cred->security);
ecfcc53f 1275 struct smk_audit_info ad;
e114e473
CS		 1276
1277 /*
1278 * struct fown_struct is never outside the context of a struct file
1279 */
1280 file = container_of(fown, struct file, f_owner);
7898e1f8 1281
ecfcc53f
EB		 1282 /* we don't log here as rc can be overriden */
1283 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
5cd9c58f 1284 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
ecfcc53f
EB		 1285 rc = 0;
1286
1287 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1288 smk_ad_setfield_u_tsk(&ad, tsk);
1289 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
e114e473
CS		 1290 return rc;
1291}
1292
1293/**
1294 * smack_file_receive - Smack file receive check
1295 * @file: the object
1296 *
1297 * Returns 0 if current has access, error code otherwise
1298 */
1299static int smack_file_receive(struct file *file)
1300{
1301 int may = 0;
ecfcc53f 1302 struct smk_audit_info ad;
e114e473 1303
ecfcc53f
EB		 1304 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1305 smk_ad_setfield_u_fs_path(&ad, file->f_path);
e114e473
CS		 1306 /*
1307 * This code relies on bitmasks.
1308 */
1309 if (file->f_mode & FMODE_READ)
1310 may = MAY_READ;
1311 if (file->f_mode & FMODE_WRITE)
1312 may |= MAY_WRITE;
1313
ecfcc53f 1314 return smk_curacc(file->f_security, may, &ad);
e114e473
CS		 1315}
1316
1317/*
1318 * Task hooks
1319 */
1320
ee18d64c
DH		 1321/**
1322 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1323 * @new: the new credentials
1324 * @gfp: the atomicity of any memory allocations
1325 *
1326 * Prepare a blank set of credentials for modification. This must allocate all
1327 * the memory the LSM module might require such that cred_transfer() can
1328 * complete without error.
1329 */
1330static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1331{
7898e1f8
CS		 1332 struct task_smack *tsp;
1333
1334 tsp = new_task_smack(NULL, NULL, gfp);
1335 if (tsp == NULL)
676dac4b 1336 return -ENOMEM;
7898e1f8
CS		 1337
1338 cred->security = tsp;
1339
ee18d64c
DH		 1340 return 0;
1341}
1342
1343
e114e473 1344/**
f1752eec
DH		 1345 * smack_cred_free - "free" task-level security credentials
1346 * @cred: the credentials in question
e114e473 1347 *
e114e473 1348 */
f1752eec 1349static void smack_cred_free(struct cred *cred)
e114e473 1350{
7898e1f8
CS		 1351 struct task_smack *tsp = cred->security;
1352 struct smack_rule *rp;
1353 struct list_head *l;
1354 struct list_head *n;
1355
1356 if (tsp == NULL)
1357 return;
1358 cred->security = NULL;
1359
1360 list_for_each_safe(l, n, &tsp->smk_rules) {
1361 rp = list_entry(l, struct smack_rule, list);
1362 list_del(&rp->list);
1363 kfree(rp);
1364 }
1365 kfree(tsp);
e114e473
CS		 1366}
1367
d84f4f99
DH		 1368/**
1369 * smack_cred_prepare - prepare new set of credentials for modification
1370 * @new: the new credentials
1371 * @old: the original credentials
1372 * @gfp: the atomicity of any memory allocations
1373 *
1374 * Prepare a new set of credentials for modification.
1375 */
1376static int smack_cred_prepare(struct cred *new, const struct cred *old,
1377 gfp_t gfp)
1378{
676dac4b
CS		 1379 struct task_smack *old_tsp = old->security;
1380 struct task_smack *new_tsp;
7898e1f8 1381 int rc;
676dac4b 1382
7898e1f8 1383 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
676dac4b
CS		 1384 if (new_tsp == NULL)
1385 return -ENOMEM;
1386
7898e1f8
CS		 1387 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1388 if (rc != 0)
1389 return rc;
1390
676dac4b 1391 new->security = new_tsp;
d84f4f99
DH		 1392 return 0;
1393}
1394
ee18d64c
DH		 1395/**
1396 * smack_cred_transfer - Transfer the old credentials to the new credentials
1397 * @new: the new credentials
1398 * @old: the original credentials
1399 *
1400 * Fill in a set of blank credentials from another set of credentials.
1401 */
1402static void smack_cred_transfer(struct cred *new, const struct cred *old)
1403{
676dac4b
CS		 1404 struct task_smack *old_tsp = old->security;
1405 struct task_smack *new_tsp = new->security;
1406
1407 new_tsp->smk_task = old_tsp->smk_task;
1408 new_tsp->smk_forked = old_tsp->smk_task;
7898e1f8
CS		 1409 mutex_init(&new_tsp->smk_rules_lock);
1410 INIT_LIST_HEAD(&new_tsp->smk_rules);
1411
1412
1413 /* cbs copy rule list */
ee18d64c
DH		 1414}
1415
3a3b7ce9
DH		 1416/**
1417 * smack_kernel_act_as - Set the subjective context in a set of credentials
251a2a95
RD		 1418 * @new: points to the set of credentials to be modified.
1419 * @secid: specifies the security ID to be set
3a3b7ce9
DH		 1420 *
1421 * Set the security data for a kernel service.
1422 */
1423static int smack_kernel_act_as(struct cred *new, u32 secid)
1424{
676dac4b 1425 struct task_smack *new_tsp = new->security;
3a3b7ce9
DH		 1426 char *smack = smack_from_secid(secid);
1427
1428 if (smack == NULL)
1429 return -EINVAL;
1430
676dac4b 1431 new_tsp->smk_task = smack;
3a3b7ce9
DH		 1432 return 0;
1433}
1434
1435/**
1436 * smack_kernel_create_files_as - Set the file creation label in a set of creds
251a2a95
RD		 1437 * @new: points to the set of credentials to be modified
1438 * @inode: points to the inode to use as a reference
3a3b7ce9
DH		 1439 *
1440 * Set the file creation context in a set of credentials to the same
1441 * as the objective context of the specified inode
1442 */
1443static int smack_kernel_create_files_as(struct cred *new,
1444 struct inode *inode)
1445{
1446 struct inode_smack *isp = inode->i_security;
676dac4b 1447 struct task_smack *tsp = new->security;
3a3b7ce9 1448
676dac4b
CS		 1449 tsp->smk_forked = isp->smk_inode;
1450 tsp->smk_task = isp->smk_inode;
3a3b7ce9
DH		 1451 return 0;
1452}
1453
ecfcc53f
EB		 1454/**
1455 * smk_curacc_on_task - helper to log task related access
1456 * @p: the task object
1457 * @access : the access requested
1458 *
1459 * Return 0 if access is permitted
1460 */
1461static int smk_curacc_on_task(struct task_struct *p, int access)
1462{
1463 struct smk_audit_info ad;
1464
1465 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1466 smk_ad_setfield_u_tsk(&ad, p);
676dac4b 1467 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
ecfcc53f
EB		 1468}
1469
e114e473
CS		 1470/**
1471 * smack_task_setpgid - Smack check on setting pgid
1472 * @p: the task object
1473 * @pgid: unused
1474 *
1475 * Return 0 if write access is permitted
1476 */
1477static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1478{
ecfcc53f 1479 return smk_curacc_on_task(p, MAY_WRITE);
e114e473
CS		 1480}
1481
1482/**
1483 * smack_task_getpgid - Smack access check for getpgid
1484 * @p: the object task
1485 *
1486 * Returns 0 if current can read the object task, error code otherwise
1487 */
1488static int smack_task_getpgid(struct task_struct *p)
1489{
ecfcc53f 1490 return smk_curacc_on_task(p, MAY_READ);
e114e473
CS		 1491}
1492
1493/**
1494 * smack_task_getsid - Smack access check for getsid
1495 * @p: the object task
1496 *
1497 * Returns 0 if current can read the object task, error code otherwise
1498 */
1499static int smack_task_getsid(struct task_struct *p)
1500{
ecfcc53f 1501 return smk_curacc_on_task(p, MAY_READ);
e114e473
CS		 1502}
1503
1504/**
1505 * smack_task_getsecid - get the secid of the task
1506 * @p: the object task
1507 * @secid: where to put the result
1508 *
1509 * Sets the secid to contain a u32 version of the smack label.
1510 */
1511static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1512{
676dac4b 1513 *secid = smack_to_secid(smk_of_task(task_security(p)));
e114e473
CS		 1514}
1515
1516/**
1517 * smack_task_setnice - Smack check on setting nice
1518 * @p: the task object
1519 * @nice: unused
1520 *
1521 * Return 0 if write access is permitted
1522 */
1523static int smack_task_setnice(struct task_struct *p, int nice)
1524{
bcdca225
CS		 1525 int rc;
1526
1527 rc = cap_task_setnice(p, nice);
1528 if (rc == 0)
ecfcc53f 1529 rc = smk_curacc_on_task(p, MAY_WRITE);
bcdca225 1530 return rc;
e114e473
CS		 1531}
1532
1533/**
1534 * smack_task_setioprio - Smack check on setting ioprio
1535 * @p: the task object
1536 * @ioprio: unused
1537 *
1538 * Return 0 if write access is permitted
1539 */
1540static int smack_task_setioprio(struct task_struct *p, int ioprio)
1541{
bcdca225
CS		 1542 int rc;
1543
1544 rc = cap_task_setioprio(p, ioprio);
1545 if (rc == 0)
ecfcc53f 1546 rc = smk_curacc_on_task(p, MAY_WRITE);
bcdca225 1547 return rc;
e114e473
CS		 1548}
1549
1550/**
1551 * smack_task_getioprio - Smack check on reading ioprio
1552 * @p: the task object
1553 *
1554 * Return 0 if read access is permitted
1555 */
1556static int smack_task_getioprio(struct task_struct *p)
1557{
ecfcc53f 1558 return smk_curacc_on_task(p, MAY_READ);
e114e473
CS		 1559}
1560
1561/**
1562 * smack_task_setscheduler - Smack check on setting scheduler
1563 * @p: the task object
1564 * @policy: unused
1565 * @lp: unused
1566 *
1567 * Return 0 if read access is permitted
1568 */
b0ae1981 1569static int smack_task_setscheduler(struct task_struct *p)
e114e473 1570{
bcdca225
CS		 1571 int rc;
1572
b0ae1981 1573 rc = cap_task_setscheduler(p);
bcdca225 1574 if (rc == 0)
ecfcc53f 1575 rc = smk_curacc_on_task(p, MAY_WRITE);
bcdca225 1576 return rc;
e114e473
CS		 1577}
1578
1579/**
1580 * smack_task_getscheduler - Smack check on reading scheduler
1581 * @p: the task object
1582 *
1583 * Return 0 if read access is permitted
1584 */
1585static int smack_task_getscheduler(struct task_struct *p)
1586{
ecfcc53f 1587 return smk_curacc_on_task(p, MAY_READ);
e114e473
CS		 1588}
1589
1590/**
1591 * smack_task_movememory - Smack check on moving memory
1592 * @p: the task object
1593 *
1594 * Return 0 if write access is permitted
1595 */
1596static int smack_task_movememory(struct task_struct *p)
1597{
ecfcc53f 1598 return smk_curacc_on_task(p, MAY_WRITE);
e114e473
CS		 1599}
1600
1601/**
1602 * smack_task_kill - Smack check on signal delivery
1603 * @p: the task object
1604 * @info: unused
1605 * @sig: unused
1606 * @secid: identifies the smack to use in lieu of current's
1607 *
1608 * Return 0 if write access is permitted
1609 *
1610 * The secid behavior is an artifact of an SELinux hack
1611 * in the USB code. Someday it may go away.
1612 */
1613static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1614 int sig, u32 secid)
1615{
ecfcc53f
EB		 1616 struct smk_audit_info ad;
1617
1618 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1619 smk_ad_setfield_u_tsk(&ad, p);
e114e473
CS		 1620 /*
1621 * Sending a signal requires that the sender
1622 * can write the receiver.
1623 */
1624 if (secid == 0)
676dac4b
CS		 1625 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1626 &ad);
e114e473
CS		 1627 /*
1628 * If the secid isn't 0 we're dealing with some USB IO
1629 * specific behavior. This is not clean. For one thing
1630 * we can't take privilege into account.
1631 */
676dac4b
CS		 1632 return smk_access(smack_from_secid(secid),
1633 smk_of_task(task_security(p)), MAY_WRITE, &ad);
e114e473
CS		 1634}
1635
1636/**
1637 * smack_task_wait - Smack access check for waiting
1638 * @p: task to wait for
1639 *
1640 * Returns 0 if current can wait for p, error code otherwise
1641 */
1642static int smack_task_wait(struct task_struct *p)
1643{
ecfcc53f 1644 struct smk_audit_info ad;
676dac4b
CS		 1645 char *sp = smk_of_current();
1646 char *tsp = smk_of_forked(task_security(p));
e114e473
CS		 1647 int rc;
1648
ecfcc53f 1649 /* we don't log here, we can be overriden */
676dac4b 1650 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
e114e473 1651 if (rc == 0)
ecfcc53f 1652 goto out_log;
e114e473
CS		 1653
1654 /*
1655 * Allow the operation to succeed if either task
1656 * has privilege to perform operations that might
1657 * account for the smack labels having gotten to
1658 * be different in the first place.
1659 *
5cd9c58f 1660 * This breaks the strict subject/object access
e114e473
CS		 1661 * control ideal, taking the object's privilege
1662 * state into account in the decision as well as
1663 * the smack value.
1664 */
5cd9c58f 1665 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
ecfcc53f
EB		 1666 rc = 0;
1667 /* we log only if we didn't get overriden */
1668 out_log:
1669 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1670 smk_ad_setfield_u_tsk(&ad, p);
676dac4b 1671 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
e114e473
CS		 1672 return rc;
1673}
1674
1675/**
1676 * smack_task_to_inode - copy task smack into the inode blob
1677 * @p: task to copy from
251a2a95 1678 * @inode: inode to copy to
e114e473
CS		 1679 *
1680 * Sets the smack pointer in the inode security blob
1681 */
1682static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1683{
1684 struct inode_smack *isp = inode->i_security;
676dac4b 1685 isp->smk_inode = smk_of_task(task_security(p));
e114e473
CS		 1686}
1687
1688/*
1689 * Socket hooks.
1690 */
1691
1692/**
1693 * smack_sk_alloc_security - Allocate a socket blob
1694 * @sk: the socket
1695 * @family: unused
251a2a95 1696 * @gfp_flags: memory allocation flags
e114e473
CS		 1697 *
1698 * Assign Smack pointers to current
1699 *
1700 * Returns 0 on success, -ENOMEM is there's no memory
1701 */
1702static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1703{
676dac4b 1704 char *csp = smk_of_current();
e114e473
CS		 1705 struct socket_smack *ssp;
1706
1707 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1708 if (ssp == NULL)
1709 return -ENOMEM;
1710
1711 ssp->smk_in = csp;
1712 ssp->smk_out = csp;
1713 ssp->smk_packet[0] = '\0';
1714
1715 sk->sk_security = ssp;
1716
1717 return 0;
1718}
1719
1720/**
1721 * smack_sk_free_security - Free a socket blob
1722 * @sk: the socket
1723 *
1724 * Clears the blob pointer
1725 */
1726static void smack_sk_free_security(struct sock *sk)
1727{
1728 kfree(sk->sk_security);
1729}
1730
07feee8f
PM		 1731/**
1732* smack_host_label - check host based restrictions
1733* @sip: the object end
1734*
1735* looks for host based access restrictions
1736*
1737* This version will only be appropriate for really small sets of single label
1738* hosts. The caller is responsible for ensuring that the RCU read lock is
1739* taken before calling this function.
1740*
1741* Returns the label of the far end or NULL if it's not special.
1742*/
1743static char *smack_host_label(struct sockaddr_in *sip)
1744{
1745 struct smk_netlbladdr *snp;
1746 struct in_addr *siap = &sip->sin_addr;
1747
1748 if (siap->s_addr == 0)
1749 return NULL;
1750
1751 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1752 /*
1753 * we break after finding the first match because
1754 * the list is sorted from longest to shortest mask
1755 * so we have found the most specific match
1756 */
1757 if ((&snp->smk_host.sin_addr)->s_addr ==
4303154e
EB		 1758 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1759 /* we have found the special CIPSO option */
1760 if (snp->smk_label == smack_cipso_option)
1761 return NULL;
07feee8f 1762 return snp->smk_label;
4303154e 1763 }
07feee8f
PM		 1764
1765 return NULL;
1766}
1767
e114e473
CS		 1768/**
1769 * smack_set_catset - convert a capset to netlabel mls categories
1770 * @catset: the Smack categories
1771 * @sap: where to put the netlabel categories
1772 *
1773 * Allocates and fills attr.mls.cat
1774 */
1775static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1776{
1777 unsigned char *cp;
1778 unsigned char m;
1779 int cat;
1780 int rc;
1781 int byte;
1782
c60264c4 1783 if (!catset)
e114e473
CS		 1784 return;
1785
1786 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1787 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1788 sap->attr.mls.cat->startbit = 0;
1789
1790 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1791 for (m = 0x80; m != 0; m >>= 1, cat++) {
1792 if ((m & *cp) == 0)
1793 continue;
1794 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1795 cat, GFP_ATOMIC);
1796 }
1797}
1798
1799/**
1800 * smack_to_secattr - fill a secattr from a smack value
1801 * @smack: the smack value
1802 * @nlsp: where the result goes
1803 *
1804 * Casey says that CIPSO is good enough for now.
1805 * It can be used to effect.
1806 * It can also be abused to effect when necessary.
1807 * Appologies to the TSIG group in general and GW in particular.
1808 */
1809static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1810{
1811 struct smack_cipso cipso;
1812 int rc;
1813
6d3dc07c
CS		 1814 nlsp->domain = smack;
1815 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
e114e473 1816
6d3dc07c
CS		 1817 rc = smack_to_cipso(smack, &cipso);
1818 if (rc == 0) {
1819 nlsp->attr.mls.lvl = cipso.smk_level;
1820 smack_set_catset(cipso.smk_catset, nlsp);
1821 } else {
1822 nlsp->attr.mls.lvl = smack_cipso_direct;
1823 smack_set_catset(smack, nlsp);
e114e473
CS		 1824 }
1825}
1826
1827/**
1828 * smack_netlabel - Set the secattr on a socket
1829 * @sk: the socket
6d3dc07c 1830 * @labeled: socket label scheme
e114e473
CS		 1831 *
1832 * Convert the outbound smack value (smk_out) to a
1833 * secattr and attach it to the socket.
1834 *
1835 * Returns 0 on success or an error code
1836 */
6d3dc07c 1837static int smack_netlabel(struct sock *sk, int labeled)
e114e473 1838{
07feee8f 1839 struct socket_smack *ssp = sk->sk_security;
e114e473 1840 struct netlbl_lsm_secattr secattr;
6d3dc07c 1841 int rc = 0;
e114e473 1842
6d3dc07c
CS		 1843 /*
1844 * Usually the netlabel code will handle changing the
1845 * packet labeling based on the label.
1846 * The case of a single label host is different, because
1847 * a single label host should never get a labeled packet
1848 * even though the label is usually associated with a packet
1849 * label.
1850 */
1851 local_bh_disable();
1852 bh_lock_sock_nested(sk);
1853
1854 if (ssp->smk_out == smack_net_ambient ||
1855 labeled == SMACK_UNLABELED_SOCKET)
1856 netlbl_sock_delattr(sk);
1857 else {
1858 netlbl_secattr_init(&secattr);
1859 smack_to_secattr(ssp->smk_out, &secattr);
389fb800 1860 rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
6d3dc07c
CS		 1861 netlbl_secattr_destroy(&secattr);
1862 }
1863
1864 bh_unlock_sock(sk);
1865 local_bh_enable();
4bc87e62 1866
e114e473
CS		 1867 return rc;
1868}
1869
07feee8f
PM		 1870/**
1871 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1872 * @sk: the socket
1873 * @sap: the destination address
1874 *
1875 * Set the correct secattr for the given socket based on the destination
1876 * address and perform any outbound access checks needed.
1877 *
1878 * Returns 0 on success or an error code.
1879 *
1880 */
1881static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1882{
1883 int rc;
1884 int sk_lbl;
1885 char *hostsp;
1886 struct socket_smack *ssp = sk->sk_security;
ecfcc53f 1887 struct smk_audit_info ad;
07feee8f
PM		 1888
1889 rcu_read_lock();
1890 hostsp = smack_host_label(sap);
1891 if (hostsp != NULL) {
1892 sk_lbl = SMACK_UNLABELED_SOCKET;
ecfcc53f
EB		 1893#ifdef CONFIG_AUDIT
1894 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
1895 ad.a.u.net.family = sap->sin_family;
1896 ad.a.u.net.dport = sap->sin_port;
1897 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
1898#endif
1899 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
07feee8f
PM		 1900 } else {
1901 sk_lbl = SMACK_CIPSO_SOCKET;
1902 rc = 0;
1903 }
1904 rcu_read_unlock();
1905 if (rc != 0)
1906 return rc;
1907
1908 return smack_netlabel(sk, sk_lbl);
1909}
1910
e114e473
CS		 1911/**
1912 * smack_inode_setsecurity - set smack xattrs
1913 * @inode: the object
1914 * @name: attribute name
1915 * @value: attribute value
1916 * @size: size of the attribute
1917 * @flags: unused
1918 *
1919 * Sets the named attribute in the appropriate blob
1920 *
1921 * Returns 0 on success, or an error code
1922 */
1923static int smack_inode_setsecurity(struct inode *inode, const char *name,
1924 const void *value, size_t size, int flags)
1925{
1926 char *sp;
1927 struct inode_smack *nsp = inode->i_security;
1928 struct socket_smack *ssp;
1929 struct socket *sock;
4bc87e62 1930 int rc = 0;
e114e473 1931
4303154e 1932 if (value == NULL || size > SMK_LABELLEN || size == 0)
e114e473
CS		 1933 return -EACCES;
1934
1935 sp = smk_import(value, size);
1936 if (sp == NULL)
1937 return -EINVAL;
1938
1939 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1940 nsp->smk_inode = sp;
ddd29ec6 1941 nsp->smk_flags |= SMK_INODE_INSTANT;
e114e473
CS		 1942 return 0;
1943 }
1944 /*
1945 * The rest of the Smack xattrs are only on sockets.
1946 */
1947 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1948 return -EOPNOTSUPP;
1949
1950 sock = SOCKET_I(inode);
2e1d146a 1951 if (sock == NULL || sock->sk == NULL)
e114e473
CS		 1952 return -EOPNOTSUPP;
1953
1954 ssp = sock->sk->sk_security;
1955
1956 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1957 ssp->smk_in = sp;
1958 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1959 ssp->smk_out = sp;
b4e0d5f0
CS		 1960 if (sock->sk->sk_family != PF_UNIX) {
1961 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1962 if (rc != 0)
1963 printk(KERN_WARNING
1964 "Smack: \"%s\" netlbl error %d.\n",
1965 __func__, -rc);
1966 }
e114e473
CS		 1967 } else
1968 return -EOPNOTSUPP;
1969
1970 return 0;
1971}
1972
1973/**
1974 * smack_socket_post_create - finish socket setup
1975 * @sock: the socket
1976 * @family: protocol family
1977 * @type: unused
1978 * @protocol: unused
1979 * @kern: unused
1980 *
1981 * Sets the netlabel information on the socket
1982 *
1983 * Returns 0 on success, and error code otherwise
1984 */
1985static int smack_socket_post_create(struct socket *sock, int family,
1986 int type, int protocol, int kern)
1987{
2e1d146a 1988 if (family != PF_INET || sock->sk == NULL)
e114e473
CS		 1989 return 0;
1990 /*
1991 * Set the outbound netlbl.
1992 */
6d3dc07c
CS		 1993 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1994}
1995
6d3dc07c
CS		 1996/**
1997 * smack_socket_connect - connect access check
1998 * @sock: the socket
1999 * @sap: the other end
2000 * @addrlen: size of sap
2001 *
2002 * Verifies that a connection may be possible
2003 *
2004 * Returns 0 on success, and error code otherwise
2005 */
2006static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2007 int addrlen)
2008{
6d3dc07c
CS		 2009 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
2010 return 0;
6d3dc07c
CS		 2011 if (addrlen < sizeof(struct sockaddr_in))
2012 return -EINVAL;
2013
07feee8f 2014 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
e114e473
CS		 2015}
2016
2017/**
2018 * smack_flags_to_may - convert S_ to MAY_ values
2019 * @flags: the S_ value
2020 *
2021 * Returns the equivalent MAY_ value
2022 */
2023static int smack_flags_to_may(int flags)
2024{
2025 int may = 0;
2026
2027 if (flags & S_IRUGO)
2028 may |= MAY_READ;
2029 if (flags & S_IWUGO)
2030 may |= MAY_WRITE;
2031 if (flags & S_IXUGO)
2032 may |= MAY_EXEC;
2033
2034 return may;
2035}
2036
2037/**
2038 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2039 * @msg: the object
2040 *
2041 * Returns 0
2042 */
2043static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2044{
676dac4b 2045 msg->security = smk_of_current();
e114e473
CS		 2046 return 0;
2047}
2048
2049/**
2050 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2051 * @msg: the object
2052 *
2053 * Clears the blob pointer
2054 */
2055static void smack_msg_msg_free_security(struct msg_msg *msg)
2056{
2057 msg->security = NULL;
2058}
2059
2060/**
2061 * smack_of_shm - the smack pointer for the shm
2062 * @shp: the object
2063 *
2064 * Returns a pointer to the smack value
2065 */
2066static char *smack_of_shm(struct shmid_kernel *shp)
2067{
2068 return (char *)shp->shm_perm.security;
2069}
2070
2071/**
2072 * smack_shm_alloc_security - Set the security blob for shm
2073 * @shp: the object
2074 *
2075 * Returns 0
2076 */
2077static int smack_shm_alloc_security(struct shmid_kernel *shp)
2078{
2079 struct kern_ipc_perm *isp = &shp->shm_perm;
2080
676dac4b 2081 isp->security = smk_of_current();
e114e473
CS		 2082 return 0;
2083}
2084
2085/**
2086 * smack_shm_free_security - Clear the security blob for shm
2087 * @shp: the object
2088 *
2089 * Clears the blob pointer
2090 */
2091static void smack_shm_free_security(struct shmid_kernel *shp)
2092{
2093 struct kern_ipc_perm *isp = &shp->shm_perm;
2094
2095 isp->security = NULL;
2096}
2097
ecfcc53f
EB		 2098/**
2099 * smk_curacc_shm : check if current has access on shm
2100 * @shp : the object
2101 * @access : access requested
2102 *
2103 * Returns 0 if current has the requested access, error code otherwise
2104 */
2105static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2106{
2107 char *ssp = smack_of_shm(shp);
2108 struct smk_audit_info ad;
2109
2110#ifdef CONFIG_AUDIT
2111 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2112 ad.a.u.ipc_id = shp->shm_perm.id;
2113#endif
2114 return smk_curacc(ssp, access, &ad);
2115}
2116
e114e473
CS		 2117/**
2118 * smack_shm_associate - Smack access check for shm
2119 * @shp: the object
2120 * @shmflg: access requested
2121 *
2122 * Returns 0 if current has the requested access, error code otherwise
2123 */
2124static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2125{
e114e473
CS		 2126 int may;
2127
2128 may = smack_flags_to_may(shmflg);
ecfcc53f 2129 return smk_curacc_shm(shp, may);
e114e473
CS		 2130}
2131
2132/**
2133 * smack_shm_shmctl - Smack access check for shm
2134 * @shp: the object
2135 * @cmd: what it wants to do
2136 *
2137 * Returns 0 if current has the requested access, error code otherwise
2138 */
2139static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2140{
e114e473
CS		 2141 int may;
2142
2143 switch (cmd) {
2144 case IPC_STAT:
2145 case SHM_STAT:
2146 may = MAY_READ;
2147 break;
2148 case IPC_SET:
2149 case SHM_LOCK:
2150 case SHM_UNLOCK:
2151 case IPC_RMID:
2152 may = MAY_READWRITE;
2153 break;
2154 case IPC_INFO:
2155 case SHM_INFO:
2156 /*
2157 * System level information.
2158 */
2159 return 0;
2160 default:
2161 return -EINVAL;
2162 }
ecfcc53f 2163 return smk_curacc_shm(shp, may);
e114e473
CS		 2164}
2165
2166/**
2167 * smack_shm_shmat - Smack access for shmat
2168 * @shp: the object
2169 * @shmaddr: unused
2170 * @shmflg: access requested
2171 *
2172 * Returns 0 if current has the requested access, error code otherwise
2173 */
2174static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2175 int shmflg)
2176{
e114e473
CS		 2177 int may;
2178
2179 may = smack_flags_to_may(shmflg);
ecfcc53f 2180 return smk_curacc_shm(shp, may);
e114e473
CS		 2181}
2182
2183/**
2184 * smack_of_sem - the smack pointer for the sem
2185 * @sma: the object
2186 *
2187 * Returns a pointer to the smack value
2188 */
2189static char *smack_of_sem(struct sem_array *sma)
2190{
2191 return (char *)sma->sem_perm.security;
2192}
2193
2194/**
2195 * smack_sem_alloc_security - Set the security blob for sem
2196 * @sma: the object
2197 *
2198 * Returns 0
2199 */
2200static int smack_sem_alloc_security(struct sem_array *sma)
2201{
2202 struct kern_ipc_perm *isp = &sma->sem_perm;
2203
676dac4b 2204 isp->security = smk_of_current();
e114e473
CS		 2205 return 0;
2206}
2207
2208/**
2209 * smack_sem_free_security - Clear the security blob for sem
2210 * @sma: the object
2211 *
2212 * Clears the blob pointer
2213 */
2214static void smack_sem_free_security(struct sem_array *sma)
2215{
2216 struct kern_ipc_perm *isp = &sma->sem_perm;
2217
2218 isp->security = NULL;
2219}
2220
ecfcc53f
EB		 2221/**
2222 * smk_curacc_sem : check if current has access on sem
2223 * @sma : the object
2224 * @access : access requested
2225 *
2226 * Returns 0 if current has the requested access, error code otherwise
2227 */
2228static int smk_curacc_sem(struct sem_array *sma, int access)
2229{
2230 char *ssp = smack_of_sem(sma);
2231 struct smk_audit_info ad;
2232
2233#ifdef CONFIG_AUDIT
2234 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2235 ad.a.u.ipc_id = sma->sem_perm.id;
2236#endif
2237 return smk_curacc(ssp, access, &ad);
2238}
2239
e114e473
CS		 2240/**
2241 * smack_sem_associate - Smack access check for sem
2242 * @sma: the object
2243 * @semflg: access requested
2244 *
2245 * Returns 0 if current has the requested access, error code otherwise
2246 */
2247static int smack_sem_associate(struct sem_array *sma, int semflg)
2248{
e114e473
CS		 2249 int may;
2250
2251 may = smack_flags_to_may(semflg);
ecfcc53f 2252 return smk_curacc_sem(sma, may);
e114e473
CS		 2253}
2254
2255/**
2256 * smack_sem_shmctl - Smack access check for sem
2257 * @sma: the object
2258 * @cmd: what it wants to do
2259 *
2260 * Returns 0 if current has the requested access, error code otherwise
2261 */
2262static int smack_sem_semctl(struct sem_array *sma, int cmd)
2263{
e114e473
CS		 2264 int may;
2265
2266 switch (cmd) {
2267 case GETPID:
2268 case GETNCNT:
2269 case GETZCNT:
2270 case GETVAL:
2271 case GETALL:
2272 case IPC_STAT:
2273 case SEM_STAT:
2274 may = MAY_READ;
2275 break;
2276 case SETVAL:
2277 case SETALL:
2278 case IPC_RMID:
2279 case IPC_SET:
2280 may = MAY_READWRITE;
2281 break;
2282 case IPC_INFO:
2283 case SEM_INFO:
2284 /*
2285 * System level information
2286 */
2287 return 0;
2288 default:
2289 return -EINVAL;
2290 }
2291
ecfcc53f 2292 return smk_curacc_sem(sma, may);
e114e473
CS		 2293}
2294
2295/**
2296 * smack_sem_semop - Smack checks of semaphore operations
2297 * @sma: the object
2298 * @sops: unused
2299 * @nsops: unused
2300 * @alter: unused
2301 *
2302 * Treated as read and write in all cases.
2303 *
2304 * Returns 0 if access is allowed, error code otherwise
2305 */
2306static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2307 unsigned nsops, int alter)
2308{
ecfcc53f 2309 return smk_curacc_sem(sma, MAY_READWRITE);
e114e473
CS		 2310}
2311
2312/**
2313 * smack_msg_alloc_security - Set the security blob for msg
2314 * @msq: the object
2315 *
2316 * Returns 0
2317 */
2318static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2319{
2320 struct kern_ipc_perm *kisp = &msq->q_perm;
2321
676dac4b 2322 kisp->security = smk_of_current();
e114e473
CS		 2323 return 0;
2324}
2325
2326/**
2327 * smack_msg_free_security - Clear the security blob for msg
2328 * @msq: the object
2329 *
2330 * Clears the blob pointer
2331 */
2332static void smack_msg_queue_free_security(struct msg_queue *msq)
2333{
2334 struct kern_ipc_perm *kisp = &msq->q_perm;
2335
2336 kisp->security = NULL;
2337}
2338
2339/**
2340 * smack_of_msq - the smack pointer for the msq
2341 * @msq: the object
2342 *
2343 * Returns a pointer to the smack value
2344 */
2345static char *smack_of_msq(struct msg_queue *msq)
2346{
2347 return (char *)msq->q_perm.security;
2348}
2349
ecfcc53f
EB		 2350/**
2351 * smk_curacc_msq : helper to check if current has access on msq
2352 * @msq : the msq
2353 * @access : access requested
2354 *
2355 * return 0 if current has access, error otherwise
2356 */
2357static int smk_curacc_msq(struct msg_queue *msq, int access)
2358{
2359 char *msp = smack_of_msq(msq);
2360 struct smk_audit_info ad;
2361
2362#ifdef CONFIG_AUDIT
2363 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2364 ad.a.u.ipc_id = msq->q_perm.id;
2365#endif
2366 return smk_curacc(msp, access, &ad);
2367}
2368
e114e473
CS		 2369/**
2370 * smack_msg_queue_associate - Smack access check for msg_queue
2371 * @msq: the object
2372 * @msqflg: access requested
2373 *
2374 * Returns 0 if current has the requested access, error code otherwise
2375 */
2376static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2377{
e114e473
CS		 2378 int may;
2379
2380 may = smack_flags_to_may(msqflg);
ecfcc53f 2381 return smk_curacc_msq(msq, may);
e114e473
CS		 2382}
2383
2384/**
2385 * smack_msg_queue_msgctl - Smack access check for msg_queue
2386 * @msq: the object
2387 * @cmd: what it wants to do
2388 *
2389 * Returns 0 if current has the requested access, error code otherwise
2390 */
2391static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2392{
e114e473
CS		 2393 int may;
2394
2395 switch (cmd) {
2396 case IPC_STAT:
2397 case MSG_STAT:
2398 may = MAY_READ;
2399 break;
2400 case IPC_SET:
2401 case IPC_RMID:
2402 may = MAY_READWRITE;
2403 break;
2404 case IPC_INFO:
2405 case MSG_INFO:
2406 /*
2407 * System level information
2408 */
2409 return 0;
2410 default:
2411 return -EINVAL;
2412 }
2413
ecfcc53f 2414 return smk_curacc_msq(msq, may);
e114e473
CS		 2415}
2416
2417/**
2418 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2419 * @msq: the object
2420 * @msg: unused
2421 * @msqflg: access requested
2422 *
2423 * Returns 0 if current has the requested access, error code otherwise
2424 */
2425static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2426 int msqflg)
2427{
ecfcc53f 2428 int may;
e114e473 2429
ecfcc53f
EB		 2430 may = smack_flags_to_may(msqflg);
2431 return smk_curacc_msq(msq, may);
e114e473
CS		 2432}
2433
2434/**
2435 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2436 * @msq: the object
2437 * @msg: unused
2438 * @target: unused
2439 * @type: unused
2440 * @mode: unused
2441 *
2442 * Returns 0 if current has read and write access, error code otherwise
2443 */
2444static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2445 struct task_struct *target, long type, int mode)
2446{
ecfcc53f 2447 return smk_curacc_msq(msq, MAY_READWRITE);
e114e473
CS		 2448}
2449
2450/**
2451 * smack_ipc_permission - Smack access for ipc_permission()
2452 * @ipp: the object permissions
2453 * @flag: access requested
2454 *
2455 * Returns 0 if current has read and write access, error code otherwise
2456 */
2457static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2458{
2459 char *isp = ipp->security;
ecfcc53f
EB		 2460 int may = smack_flags_to_may(flag);
2461 struct smk_audit_info ad;
e114e473 2462
ecfcc53f
EB		 2463#ifdef CONFIG_AUDIT
2464 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2465 ad.a.u.ipc_id = ipp->id;
2466#endif
2467 return smk_curacc(isp, may, &ad);
e114e473
CS		 2468}
2469
d20bdda6
AD		 2470/**
2471 * smack_ipc_getsecid - Extract smack security id
251a2a95 2472 * @ipp: the object permissions
d20bdda6
AD		 2473 * @secid: where result will be saved
2474 */
2475static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2476{
2477 char *smack = ipp->security;
2478
2479 *secid = smack_to_secid(smack);
2480}
2481
e114e473
CS		 2482/**
2483 * smack_d_instantiate - Make sure the blob is correct on an inode
3e62cbb8 2484 * @opt_dentry: dentry where inode will be attached
e114e473
CS		 2485 * @inode: the object
2486 *
2487 * Set the inode's security blob if it hasn't been done already.
2488 */
2489static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2490{
2491 struct super_block *sbp;
2492 struct superblock_smack *sbsp;
2493 struct inode_smack *isp;
676dac4b 2494 char *csp = smk_of_current();
e114e473
CS		 2495 char *fetched;
2496 char *final;
5c6d1125
JS		 2497 char trattr[TRANS_TRUE_SIZE];
2498 int transflag = 0;
e114e473
CS		 2499 struct dentry *dp;
2500
2501 if (inode == NULL)
2502 return;
2503
2504 isp = inode->i_security;
2505
2506 mutex_lock(&isp->smk_lock);
2507 /*
2508 * If the inode is already instantiated
2509 * take the quick way out
2510 */
2511 if (isp->smk_flags & SMK_INODE_INSTANT)
2512 goto unlockandout;
2513
2514 sbp = inode->i_sb;
2515 sbsp = sbp->s_security;
2516 /*
2517 * We're going to use the superblock default label
2518 * if there's no label on the file.
2519 */
2520 final = sbsp->smk_default;
2521
e97dcb0e
CS		 2522 /*
2523 * If this is the root inode the superblock
2524 * may be in the process of initialization.
2525 * If that is the case use the root value out
2526 * of the superblock.
2527 */
2528 if (opt_dentry->d_parent == opt_dentry) {
2529 isp->smk_inode = sbsp->smk_root;
2530 isp->smk_flags |= SMK_INODE_INSTANT;
2531 goto unlockandout;
2532 }
2533
e114e473
CS		 2534 /*
2535 * This is pretty hackish.
2536 * Casey says that we shouldn't have to do
2537 * file system specific code, but it does help
2538 * with keeping it simple.
2539 */
2540 switch (sbp->s_magic) {
2541 case SMACK_MAGIC:
2542 /*
2543 * Casey says that it's a little embarassing
2544 * that the smack file system doesn't do
2545 * extended attributes.
2546 */
2547 final = smack_known_star.smk_known;
2548 break;
2549 case PIPEFS_MAGIC:
2550 /*
2551 * Casey says pipes are easy (?)
2552 */
2553 final = smack_known_star.smk_known;
2554 break;
2555 case DEVPTS_SUPER_MAGIC:
2556 /*
2557 * devpts seems content with the label of the task.
2558 * Programs that change smack have to treat the
2559 * pty with respect.
2560 */
2561 final = csp;
2562 break;
2563 case SOCKFS_MAGIC:
2564 /*
b4e0d5f0
CS		 2565 * Socket access is controlled by the socket
2566 * structures associated with the task involved.
e114e473 2567 */
b4e0d5f0 2568 final = smack_known_star.smk_known;
e114e473
CS		 2569 break;
2570 case PROC_SUPER_MAGIC:
2571 /*
2572 * Casey says procfs appears not to care.
2573 * The superblock default suffices.
2574 */
2575 break;
2576 case TMPFS_MAGIC:
2577 /*
2578 * Device labels should come from the filesystem,
2579 * but watch out, because they're volitile,
2580 * getting recreated on every reboot.
2581 */
2582 final = smack_known_star.smk_known;
2583 /*
2584 * No break.
2585 *
2586 * If a smack value has been set we want to use it,
2587 * but since tmpfs isn't giving us the opportunity
2588 * to set mount options simulate setting the
2589 * superblock default.
2590 */
2591 default:
2592 /*
2593 * This isn't an understood special case.
2594 * Get the value from the xattr.
b4e0d5f0
CS		 2595 */
2596
2597 /*
2598 * UNIX domain sockets use lower level socket data.
2599 */
2600 if (S_ISSOCK(inode->i_mode)) {
2601 final = smack_known_star.smk_known;
2602 break;
2603 }
2604 /*
e114e473
CS		 2605 * No xattr support means, alas, no SMACK label.
2606 * Use the aforeapplied default.
2607 * It would be curious if the label of the task
2608 * does not match that assigned.
2609 */
2610 if (inode->i_op->getxattr == NULL)
2611 break;
2612 /*
2613 * Get the dentry for xattr.
2614 */
3e62cbb8 2615 dp = dget(opt_dentry);
676dac4b 2616 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
5c6d1125 2617 if (fetched != NULL) {
e114e473 2618 final = fetched;
5c6d1125
JS		 2619 if (S_ISDIR(inode->i_mode)) {
2620 trattr[0] = '\0';
2621 inode->i_op->getxattr(dp,
2622 XATTR_NAME_SMACKTRANSMUTE,
2623 trattr, TRANS_TRUE_SIZE);
2624 if (strncmp(trattr, TRANS_TRUE,
2625 TRANS_TRUE_SIZE) == 0)
2626 transflag = SMK_INODE_TRANSMUTE;
2627 }
2628 }
2629 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
7898e1f8 2630 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
676dac4b 2631
e114e473
CS		 2632 dput(dp);
2633 break;
2634 }
2635
2636 if (final == NULL)
2637 isp->smk_inode = csp;
2638 else
2639 isp->smk_inode = final;
2640
5c6d1125 2641 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
e114e473
CS		 2642
2643unlockandout:
2644 mutex_unlock(&isp->smk_lock);
2645 return;
2646}
2647
2648/**
2649 * smack_getprocattr - Smack process attribute access
2650 * @p: the object task
2651 * @name: the name of the attribute in /proc/.../attr
2652 * @value: where to put the result
2653 *
2654 * Places a copy of the task Smack into value
2655 *
2656 * Returns the length of the smack label or an error code
2657 */
2658static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2659{
2660 char *cp;
2661 int slen;
2662
2663 if (strcmp(name, "current") != 0)
2664 return -EINVAL;
2665
676dac4b 2666 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
e114e473
CS		 2667 if (cp == NULL)
2668 return -ENOMEM;
2669
2670 slen = strlen(cp);
2671 *value = cp;
2672 return slen;
2673}
2674
2675/**
2676 * smack_setprocattr - Smack process attribute setting
2677 * @p: the object task
2678 * @name: the name of the attribute in /proc/.../attr
2679 * @value: the value to set
2680 * @size: the size of the value
2681 *
2682 * Sets the Smack value of the task. Only setting self
2683 * is permitted and only with privilege
2684 *
2685 * Returns the length of the smack label or an error code
2686 */
2687static int smack_setprocattr(struct task_struct *p, char *name,
2688 void *value, size_t size)
2689{
7898e1f8 2690 int rc;
676dac4b 2691 struct task_smack *tsp;
5c6d1125 2692 struct task_smack *oldtsp;
d84f4f99 2693 struct cred *new;
e114e473
CS		 2694 char *newsmack;
2695
e114e473
CS		 2696 /*
2697 * Changing another process' Smack value is too dangerous
2698 * and supports no sane use case.
2699 */
2700 if (p != current)
2701 return -EPERM;
2702
5cd9c58f
DH		 2703 if (!capable(CAP_MAC_ADMIN))
2704 return -EPERM;
2705
e114e473
CS		 2706 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2707 return -EINVAL;
2708
2709 if (strcmp(name, "current") != 0)
2710 return -EINVAL;
2711
2712 newsmack = smk_import(value, size);
2713 if (newsmack == NULL)
2714 return -EINVAL;
2715
6d3dc07c
CS		 2716 /*
2717 * No process is ever allowed the web ("@") label.
2718 */
2719 if (newsmack == smack_known_web.smk_known)
2720 return -EPERM;
2721
5c6d1125 2722 oldtsp = p->cred->security;
d84f4f99 2723 new = prepare_creds();
6d3dc07c 2724 if (new == NULL)
d84f4f99 2725 return -ENOMEM;
7898e1f8
CS		 2726
2727 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
676dac4b
CS		 2728 if (tsp == NULL) {
2729 kfree(new);
2730 return -ENOMEM;
2731 }
7898e1f8
CS		 2732 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2733 if (rc != 0)
2734 return rc;
2735
676dac4b 2736 new->security = tsp;
d84f4f99 2737 commit_creds(new);
e114e473
CS		 2738 return size;
2739}
2740
2741/**
2742 * smack_unix_stream_connect - Smack access on UDS
3610cda5
DM		 2743 * @sock: one sock
2744 * @other: the other sock
e114e473
CS		 2745 * @newsk: unused
2746 *
2747 * Return 0 if a subject with the smack of sock could access
2748 * an object with the smack of other, otherwise an error code
2749 */
3610cda5
DM		 2750static int smack_unix_stream_connect(struct sock *sock,
2751 struct sock *other, struct sock *newsk)
e114e473 2752{
d2e7ad19
JM		 2753 struct socket_smack *ssp = sock->sk_security;
2754 struct socket_smack *osp = other->sk_security;
ecfcc53f 2755 struct smk_audit_info ad;
b4e0d5f0 2756 int rc = 0;
e114e473 2757
ecfcc53f 2758 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3610cda5 2759 smk_ad_setfield_u_net_sk(&ad, other);
b4e0d5f0
CS		 2760
2761 if (!capable(CAP_MAC_OVERRIDE))
2762 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2763
2764 return rc;
e114e473
CS		 2765}
2766
2767/**
2768 * smack_unix_may_send - Smack access on UDS
2769 * @sock: one socket
2770 * @other: the other socket
2771 *
2772 * Return 0 if a subject with the smack of sock could access
2773 * an object with the smack of other, otherwise an error code
2774 */
2775static int smack_unix_may_send(struct socket *sock, struct socket *other)
2776{
b4e0d5f0
CS		 2777 struct socket_smack *ssp = sock->sk->sk_security;
2778 struct socket_smack *osp = other->sk->sk_security;
ecfcc53f 2779 struct smk_audit_info ad;
b4e0d5f0 2780 int rc = 0;
e114e473 2781
ecfcc53f
EB		 2782 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2783 smk_ad_setfield_u_net_sk(&ad, other->sk);
b4e0d5f0
CS		 2784
2785 if (!capable(CAP_MAC_OVERRIDE))
2786 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2787
2788 return rc;
e114e473
CS		 2789}
2790
6d3dc07c
CS		 2791/**
2792 * smack_socket_sendmsg - Smack check based on destination host
2793 * @sock: the socket
251a2a95 2794 * @msg: the message
6d3dc07c
CS		 2795 * @size: the size of the message
2796 *
2797 * Return 0 if the current subject can write to the destination
2798 * host. This is only a question if the destination is a single
2799 * label host.
2800 */
2801static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2802 int size)
2803{
2804 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
6d3dc07c
CS		 2805
2806 /*
2807 * Perfectly reasonable for this to be NULL
2808 */
da34d424 2809 if (sip == NULL || sip->sin_family != AF_INET)
6d3dc07c
CS		 2810 return 0;
2811
07feee8f 2812 return smack_netlabel_send(sock->sk, sip);
6d3dc07c
CS		 2813}
2814
2815
e114e473 2816/**
251a2a95 2817 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
e114e473
CS		 2818 * @sap: netlabel secattr
2819 * @sip: where to put the result
2820 *
2821 * Copies a smack label into sip
2822 */
2823static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2824{
2825 char smack[SMK_LABELLEN];
6d3dc07c 2826 char *sp;
e114e473
CS		 2827 int pcat;
2828
6d3dc07c 2829 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
e114e473 2830 /*
6d3dc07c 2831 * Looks like a CIPSO packet.
e114e473
CS		 2832 * If there are flags but no level netlabel isn't
2833 * behaving the way we expect it to.
2834 *
6d3dc07c 2835 * Get the categories, if any
e114e473
CS		 2836 * Without guidance regarding the smack value
2837 * for the packet fall back on the network
2838 * ambient value.
2839 */
6d3dc07c
CS		 2840 memset(smack, '\0', SMK_LABELLEN);
2841 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2842 for (pcat = -1;;) {
2843 pcat = netlbl_secattr_catmap_walk(
2844 sap->attr.mls.cat, pcat + 1);
2845 if (pcat < 0)
2846 break;
2847 smack_catset_bit(pcat, smack);
2848 }
2849 /*
2850 * If it is CIPSO using smack direct mapping
2851 * we are already done. WeeHee.
2852 */
2853 if (sap->attr.mls.lvl == smack_cipso_direct) {
2854 memcpy(sip, smack, SMK_MAXLEN);
2855 return;
2856 }
2857 /*
2858 * Look it up in the supplied table if it is not
2859 * a direct mapping.
2860 */
2861 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
e114e473
CS		 2862 return;
2863 }
6d3dc07c
CS		 2864 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2865 /*
2866 * Looks like a fallback, which gives us a secid.
2867 */
2868 sp = smack_from_secid(sap->attr.secid);
2869 /*
2870 * This has got to be a bug because it is
2871 * impossible to specify a fallback without
2872 * specifying the label, which will ensure
2873 * it has a secid, and the only way to get a
2874 * secid is from a fallback.
2875 */
2876 BUG_ON(sp == NULL);
2877 strncpy(sip, sp, SMK_MAXLEN);
e114e473
CS		 2878 return;
2879 }
2880 /*
6d3dc07c
CS		 2881 * Without guidance regarding the smack value
2882 * for the packet fall back on the network
2883 * ambient value.
e114e473 2884 */
6d3dc07c 2885 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
e114e473
CS		 2886 return;
2887}
2888
2889/**
2890 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2891 * @sk: socket
2892 * @skb: packet
2893 *
2894 * Returns 0 if the packet should be delivered, an error code otherwise
2895 */
2896static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2897{
2898 struct netlbl_lsm_secattr secattr;
2899 struct socket_smack *ssp = sk->sk_security;
2900 char smack[SMK_LABELLEN];
6d3dc07c 2901 char *csp;
e114e473 2902 int rc;
ecfcc53f 2903 struct smk_audit_info ad;
e114e473
CS		 2904 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2905 return 0;
2906
2907 /*
2908 * Translate what netlabel gave us.
2909 */
e114e473 2910 netlbl_secattr_init(&secattr);
6d3dc07c 2911
e114e473 2912 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
6d3dc07c 2913 if (rc == 0) {
e114e473 2914 smack_from_secattr(&secattr, smack);
6d3dc07c
CS		 2915 csp = smack;
2916 } else
2917 csp = smack_net_ambient;
2918
e114e473 2919 netlbl_secattr_destroy(&secattr);
6d3dc07c 2920
ecfcc53f
EB		 2921#ifdef CONFIG_AUDIT
2922 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2923 ad.a.u.net.family = sk->sk_family;
8964be4a 2924 ad.a.u.net.netif = skb->skb_iif;
ecfcc53f
EB		 2925 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2926#endif
e114e473
CS		 2927 /*
2928 * Receiving a packet requires that the other end
2929 * be able to write here. Read access is not required.
2930 * This is the simplist possible security model
2931 * for networking.
2932 */
ecfcc53f 2933 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
a8134296
PM		 2934 if (rc != 0)
2935 netlbl_skbuff_err(skb, rc, 0);
2936 return rc;
e114e473
CS		 2937}
2938
2939/**
2940 * smack_socket_getpeersec_stream - pull in packet label
2941 * @sock: the socket
2942 * @optval: user's destination
2943 * @optlen: size thereof
251a2a95 2944 * @len: max thereof
e114e473
CS		 2945 *
2946 * returns zero on success, an error code otherwise
2947 */
2948static int smack_socket_getpeersec_stream(struct socket *sock,
2949 char __user *optval,
2950 int __user *optlen, unsigned len)
2951{
2952 struct socket_smack *ssp;
2953 int slen;
2954 int rc = 0;
2955
2956 ssp = sock->sk->sk_security;
2957 slen = strlen(ssp->smk_packet) + 1;
2958
2959 if (slen > len)
2960 rc = -ERANGE;
2961 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2962 rc = -EFAULT;
2963
2964 if (put_user(slen, optlen) != 0)
2965 rc = -EFAULT;
2966
2967 return rc;
2968}
2969
2970
2971/**
2972 * smack_socket_getpeersec_dgram - pull in packet label
b4e0d5f0 2973 * @sock: the peer socket
e114e473
CS		 2974 * @skb: packet data
2975 * @secid: pointer to where to put the secid of the packet
2976 *
2977 * Sets the netlabel socket state on sk from parent
2978 */
2979static int smack_socket_getpeersec_dgram(struct socket *sock,
2980 struct sk_buff *skb, u32 *secid)
2981
2982{
2983 struct netlbl_lsm_secattr secattr;
b4e0d5f0 2984 struct socket_smack *sp;
e114e473 2985 char smack[SMK_LABELLEN];
b4e0d5f0
CS		 2986 int family = PF_UNSPEC;
2987 u32 s = 0; /* 0 is the invalid secid */
e114e473
CS		 2988 int rc;
2989
b4e0d5f0
CS		 2990 if (skb != NULL) {
2991 if (skb->protocol == htons(ETH_P_IP))
2992 family = PF_INET;
2993 else if (skb->protocol == htons(ETH_P_IPV6))
2994 family = PF_INET6;
e114e473 2995 }
b4e0d5f0
CS		 2996 if (family == PF_UNSPEC && sock != NULL)
2997 family = sock->sk->sk_family;
e114e473 2998
b4e0d5f0
CS		 2999 if (family == PF_UNIX) {
3000 sp = sock->sk->sk_security;
3001 s = smack_to_secid(sp->smk_out);
3002 } else if (family == PF_INET || family == PF_INET6) {
3003 /*
3004 * Translate what netlabel gave us.
3005 */
3006 netlbl_secattr_init(&secattr);
3007 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3008 if (rc == 0) {
3009 smack_from_secattr(&secattr, smack);
3010 s = smack_to_secid(smack);
3011 }
3012 netlbl_secattr_destroy(&secattr);
3013 }
3014 *secid = s;
e114e473
CS		 3015 if (s == 0)
3016 return -EINVAL;
e114e473
CS		 3017 return 0;
3018}
3019
3020/**
07feee8f
PM		 3021 * smack_sock_graft - Initialize a newly created socket with an existing sock
3022 * @sk: child sock
3023 * @parent: parent socket
e114e473 3024 *
07feee8f
PM		 3025 * Set the smk_{in,out} state of an existing sock based on the process that
3026 * is creating the new socket.
e114e473
CS		 3027 */
3028static void smack_sock_graft(struct sock *sk, struct socket *parent)
3029{
3030 struct socket_smack *ssp;
e114e473 3031
07feee8f
PM		 3032 if (sk == NULL ||
3033 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
e114e473
CS		 3034 return;
3035
3036 ssp = sk->sk_security;
676dac4b 3037 ssp->smk_in = ssp->smk_out = smk_of_current();
07feee8f 3038 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
e114e473
CS		 3039}
3040
3041/**
3042 * smack_inet_conn_request - Smack access check on connect
3043 * @sk: socket involved
3044 * @skb: packet
3045 * @req: unused
3046 *
3047 * Returns 0 if a task with the packet label could write to
3048 * the socket, otherwise an error code
3049 */
3050static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3051 struct request_sock *req)
3052{
07feee8f 3053 u16 family = sk->sk_family;
e114e473 3054 struct socket_smack *ssp = sk->sk_security;
07feee8f
PM		 3055 struct netlbl_lsm_secattr secattr;
3056 struct sockaddr_in addr;
3057 struct iphdr *hdr;
e114e473
CS		 3058 char smack[SMK_LABELLEN];
3059 int rc;
ecfcc53f 3060 struct smk_audit_info ad;
e114e473 3061
07feee8f
PM		 3062 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3063 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3064 family = PF_INET;
e114e473 3065
07feee8f
PM		 3066 netlbl_secattr_init(&secattr);
3067 rc = netlbl_skbuff_getattr(skb, family, &secattr);
e114e473 3068 if (rc == 0)
07feee8f 3069 smack_from_secattr(&secattr, smack);
e114e473
CS		 3070 else
3071 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
07feee8f
PM		 3072 netlbl_secattr_destroy(&secattr);
3073
ecfcc53f
EB		 3074#ifdef CONFIG_AUDIT
3075 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3076 ad.a.u.net.family = family;
8964be4a 3077 ad.a.u.net.netif = skb->skb_iif;
ecfcc53f
EB		 3078 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3079#endif
e114e473 3080 /*
07feee8f
PM		 3081 * Receiving a packet requires that the other end be able to write
3082 * here. Read access is not required.
e114e473 3083 */
ecfcc53f 3084 rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad);
07feee8f
PM		 3085 if (rc != 0)
3086 return rc;
3087
3088 /*
3089 * Save the peer's label in the request_sock so we can later setup
3090 * smk_packet in the child socket so that SO_PEERCRED can report it.
3091 */
3092 req->peer_secid = smack_to_secid(smack);
3093
3094 /*
3095 * We need to decide if we want to label the incoming connection here
3096 * if we do we only need to label the request_sock and the stack will
3097 * propogate the wire-label to the sock when it is created.
3098 */
3099 hdr = ip_hdr(skb);
3100 addr.sin_addr.s_addr = hdr->saddr;
3101 rcu_read_lock();
3102 if (smack_host_label(&addr) == NULL) {
3103 rcu_read_unlock();
3104 netlbl_secattr_init(&secattr);
3105 smack_to_secattr(smack, &secattr);
3106 rc = netlbl_req_setattr(req, &secattr);
3107 netlbl_secattr_destroy(&secattr);
3108 } else {
3109 rcu_read_unlock();
3110 netlbl_req_delattr(req);
3111 }
e114e473
CS		 3112
3113 return rc;
3114}
3115
07feee8f
PM		 3116/**
3117 * smack_inet_csk_clone - Copy the connection information to the new socket
3118 * @sk: the new socket
3119 * @req: the connection's request_sock
3120 *
3121 * Transfer the connection's peer label to the newly created socket.
3122 */
3123static void smack_inet_csk_clone(struct sock *sk,
3124 const struct request_sock *req)
3125{
3126 struct socket_smack *ssp = sk->sk_security;
3127 char *smack;
3128
3129 if (req->peer_secid != 0) {
3130 smack = smack_from_secid(req->peer_secid);
3131 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
3132 } else
3133 ssp->smk_packet[0] = '\0';
3134}
3135
e114e473
CS		 3136/*
3137 * Key management security hooks
3138 *
3139 * Casey has not tested key support very heavily.
3140 * The permission check is most likely too restrictive.
3141 * If you care about keys please have a look.
3142 */
3143#ifdef CONFIG_KEYS
3144
3145/**
3146 * smack_key_alloc - Set the key security blob
3147 * @key: object
d84f4f99 3148 * @cred: the credentials to use
e114e473
CS		 3149 * @flags: unused
3150 *
3151 * No allocation required
3152 *
3153 * Returns 0
3154 */
d84f4f99 3155static int smack_key_alloc(struct key *key, const struct cred *cred,
e114e473
CS		 3156 unsigned long flags)
3157{
676dac4b 3158 key->security = smk_of_task(cred->security);
e114e473
CS		 3159 return 0;
3160}
3161
3162/**
3163 * smack_key_free - Clear the key security blob
3164 * @key: the object
3165 *
3166 * Clear the blob pointer
3167 */
3168static void smack_key_free(struct key *key)
3169{
3170 key->security = NULL;
3171}
3172
3173/*
3174 * smack_key_permission - Smack access on a key
3175 * @key_ref: gets to the object
d84f4f99 3176 * @cred: the credentials to use
e114e473
CS		 3177 * @perm: unused
3178 *
3179 * Return 0 if the task has read and write to the object,
3180 * an error code otherwise
3181 */
3182static int smack_key_permission(key_ref_t key_ref,
d84f4f99 3183 const struct cred *cred, key_perm_t perm)
e114e473
CS		 3184{
3185 struct key *keyp;
ecfcc53f 3186 struct smk_audit_info ad;
676dac4b 3187 char *tsp = smk_of_task(cred->security);
e114e473
CS		 3188
3189 keyp = key_ref_to_ptr(key_ref);
3190 if (keyp == NULL)
3191 return -EINVAL;
3192 /*
3193 * If the key hasn't been initialized give it access so that
3194 * it may do so.
3195 */
3196 if (keyp->security == NULL)
3197 return 0;
3198 /*
3199 * This should not occur
3200 */
676dac4b 3201 if (tsp == NULL)
e114e473 3202 return -EACCES;
ecfcc53f
EB		 3203#ifdef CONFIG_AUDIT
3204 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3205 ad.a.u.key_struct.key = keyp->serial;
3206 ad.a.u.key_struct.key_desc = keyp->description;
3207#endif
676dac4b 3208 return smk_access(tsp, keyp->security,
ecfcc53f 3209 MAY_READWRITE, &ad);
e114e473
CS		 3210}
3211#endif /* CONFIG_KEYS */
3212
d20bdda6
AD		 3213/*
3214 * Smack Audit hooks
3215 *
3216 * Audit requires a unique representation of each Smack specific
3217 * rule. This unique representation is used to distinguish the
3218 * object to be audited from remaining kernel objects and also
3219 * works as a glue between the audit hooks.
3220 *
3221 * Since repository entries are added but never deleted, we'll use
3222 * the smack_known label address related to the given audit rule as
3223 * the needed unique representation. This also better fits the smack
3224 * model where nearly everything is a label.
3225 */
3226#ifdef CONFIG_AUDIT
3227
3228/**
3229 * smack_audit_rule_init - Initialize a smack audit rule
3230 * @field: audit rule fields given from user-space (audit.h)
3231 * @op: required testing operator (=, !=, >, <, ...)
3232 * @rulestr: smack label to be audited
3233 * @vrule: pointer to save our own audit rule representation
3234 *
3235 * Prepare to audit cases where (@field @op @rulestr) is true.
3236 * The label to be audited is created if necessay.
3237 */
3238static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3239{
3240 char **rule = (char **)vrule;
3241 *rule = NULL;
3242
3243 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3244 return -EINVAL;
3245
5af75d8d 3246 if (op != Audit_equal && op != Audit_not_equal)
d20bdda6
AD		 3247 return -EINVAL;
3248
3249 *rule = smk_import(rulestr, 0);
3250
3251 return 0;
3252}
3253
3254/**
3255 * smack_audit_rule_known - Distinguish Smack audit rules
3256 * @krule: rule of interest, in Audit kernel representation format
3257 *
3258 * This is used to filter Smack rules from remaining Audit ones.
3259 * If it's proved that this rule belongs to us, the
3260 * audit_rule_match hook will be called to do the final judgement.
3261 */
3262static int smack_audit_rule_known(struct audit_krule *krule)
3263{
3264 struct audit_field *f;
3265 int i;
3266
3267 for (i = 0; i < krule->field_count; i++) {
3268 f = &krule->fields[i];
3269
3270 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3271 return 1;
3272 }
3273
3274 return 0;
3275}
3276
3277/**
3278 * smack_audit_rule_match - Audit given object ?
3279 * @secid: security id for identifying the object to test
3280 * @field: audit rule flags given from user-space
3281 * @op: required testing operator
3282 * @vrule: smack internal rule presentation
3283 * @actx: audit context associated with the check
3284 *
3285 * The core Audit hook. It's used to take the decision of
3286 * whether to audit or not to audit a given object.
3287 */
3288static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3289 struct audit_context *actx)
3290{
3291 char *smack;
3292 char *rule = vrule;
3293
3294 if (!rule) {
3295 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
3296 "Smack: missing rule\n");
3297 return -ENOENT;
3298 }
3299
3300 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3301 return 0;
3302
3303 smack = smack_from_secid(secid);
3304
3305 /*
3306 * No need to do string comparisons. If a match occurs,
3307 * both pointers will point to the same smack_known
3308 * label.
3309 */
5af75d8d 3310 if (op == Audit_equal)
d20bdda6 3311 return (rule == smack);
5af75d8d 3312 if (op == Audit_not_equal)
d20bdda6
AD		 3313 return (rule != smack);
3314
3315 return 0;
3316}
3317
3318/**
3319 * smack_audit_rule_free - free smack rule representation
3320 * @vrule: rule to be freed.
3321 *
3322 * No memory was allocated.
3323 */
3324static void smack_audit_rule_free(void *vrule)
3325{
3326 /* No-op */
3327}
3328
3329#endif /* CONFIG_AUDIT */
3330
251a2a95 3331/**
e114e473
CS		 3332 * smack_secid_to_secctx - return the smack label for a secid
3333 * @secid: incoming integer
3334 * @secdata: destination
3335 * @seclen: how long it is
3336 *
3337 * Exists for networking code.
3338 */
3339static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3340{
3341 char *sp = smack_from_secid(secid);
3342
d5630b9d
EP		 3343 if (secdata)
3344 *secdata = sp;
e114e473
CS		 3345 *seclen = strlen(sp);
3346 return 0;
3347}
3348
251a2a95 3349/**
4bc87e62
CS		 3350 * smack_secctx_to_secid - return the secid for a smack label
3351 * @secdata: smack label
3352 * @seclen: how long result is
3353 * @secid: outgoing integer
3354 *
3355 * Exists for audit and networking code.
3356 */
e52c1764 3357static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4bc87e62
CS		 3358{
3359 *secid = smack_to_secid(secdata);
3360 return 0;
3361}
3362
251a2a95 3363/**
e114e473 3364 * smack_release_secctx - don't do anything.
251a2a95
RD		 3365 * @secdata: unused
3366 * @seclen: unused
e114e473
CS		 3367 *
3368 * Exists to make sure nothing gets done, and properly
3369 */
3370static void smack_release_secctx(char *secdata, u32 seclen)
3371{
3372}
3373
1ee65e37
DQ		 3374static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3375{
3376 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3377}
3378
3379static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3380{
3381 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3382}
3383
3384static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3385{
3386 int len = 0;
3387 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3388
3389 if (len < 0)
3390 return len;
3391 *ctxlen = len;
3392 return 0;
3393}
3394
076c54c5
AD		 3395struct security_operations smack_ops = {
3396 .name = "smack",
3397
9e48858f 3398 .ptrace_access_check = smack_ptrace_access_check,
5cd9c58f 3399 .ptrace_traceme = smack_ptrace_traceme,
e114e473 3400 .syslog = smack_syslog,
e114e473
CS		 3401
3402 .sb_alloc_security = smack_sb_alloc_security,
3403 .sb_free_security = smack_sb_free_security,
3404 .sb_copy_data = smack_sb_copy_data,
3405 .sb_kern_mount = smack_sb_kern_mount,
3406 .sb_statfs = smack_sb_statfs,
3407 .sb_mount = smack_sb_mount,
3408 .sb_umount = smack_sb_umount,
3409
676dac4b
CS		 3410 .bprm_set_creds = smack_bprm_set_creds,
3411
e114e473
CS		 3412 .inode_alloc_security = smack_inode_alloc_security,
3413 .inode_free_security = smack_inode_free_security,
3414 .inode_init_security = smack_inode_init_security,
3415 .inode_link = smack_inode_link,
3416 .inode_unlink = smack_inode_unlink,
3417 .inode_rmdir = smack_inode_rmdir,
3418 .inode_rename = smack_inode_rename,
3419 .inode_permission = smack_inode_permission,
3420 .inode_setattr = smack_inode_setattr,
3421 .inode_getattr = smack_inode_getattr,
3422 .inode_setxattr = smack_inode_setxattr,
3423 .inode_post_setxattr = smack_inode_post_setxattr,
3424 .inode_getxattr = smack_inode_getxattr,
3425 .inode_removexattr = smack_inode_removexattr,
3426 .inode_getsecurity = smack_inode_getsecurity,
3427 .inode_setsecurity = smack_inode_setsecurity,
3428 .inode_listsecurity = smack_inode_listsecurity,
d20bdda6 3429 .inode_getsecid = smack_inode_getsecid,
e114e473
CS		 3430
3431 .file_permission = smack_file_permission,
3432 .file_alloc_security = smack_file_alloc_security,
3433 .file_free_security = smack_file_free_security,
3434 .file_ioctl = smack_file_ioctl,
3435 .file_lock = smack_file_lock,
3436 .file_fcntl = smack_file_fcntl,
7898e1f8 3437 .file_mmap = smack_file_mmap,
e114e473
CS		 3438 .file_set_fowner = smack_file_set_fowner,
3439 .file_send_sigiotask = smack_file_send_sigiotask,
3440 .file_receive = smack_file_receive,
3441
ee18d64c 3442 .cred_alloc_blank = smack_cred_alloc_blank,
f1752eec 3443 .cred_free = smack_cred_free,
d84f4f99 3444 .cred_prepare = smack_cred_prepare,
ee18d64c 3445 .cred_transfer = smack_cred_transfer,
3a3b7ce9
DH		 3446 .kernel_act_as = smack_kernel_act_as,
3447 .kernel_create_files_as = smack_kernel_create_files_as,
e114e473
CS		 3448 .task_setpgid = smack_task_setpgid,
3449 .task_getpgid = smack_task_getpgid,
3450 .task_getsid = smack_task_getsid,
3451 .task_getsecid = smack_task_getsecid,
3452 .task_setnice = smack_task_setnice,
3453 .task_setioprio = smack_task_setioprio,
3454 .task_getioprio = smack_task_getioprio,
3455 .task_setscheduler = smack_task_setscheduler,
3456 .task_getscheduler = smack_task_getscheduler,
3457 .task_movememory = smack_task_movememory,
3458 .task_kill = smack_task_kill,
3459 .task_wait = smack_task_wait,
e114e473
CS		 3460 .task_to_inode = smack_task_to_inode,
3461
3462 .ipc_permission = smack_ipc_permission,
d20bdda6 3463 .ipc_getsecid = smack_ipc_getsecid,
e114e473
CS		 3464
3465 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3466 .msg_msg_free_security = smack_msg_msg_free_security,
3467
3468 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3469 .msg_queue_free_security = smack_msg_queue_free_security,
3470 .msg_queue_associate = smack_msg_queue_associate,
3471 .msg_queue_msgctl = smack_msg_queue_msgctl,
3472 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3473 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3474
3475 .shm_alloc_security = smack_shm_alloc_security,
3476 .shm_free_security = smack_shm_free_security,
3477 .shm_associate = smack_shm_associate,
3478 .shm_shmctl = smack_shm_shmctl,
3479 .shm_shmat = smack_shm_shmat,
3480
3481 .sem_alloc_security = smack_sem_alloc_security,
3482 .sem_free_security = smack_sem_free_security,
3483 .sem_associate = smack_sem_associate,
3484 .sem_semctl = smack_sem_semctl,
3485 .sem_semop = smack_sem_semop,
3486
e114e473
CS		 3487 .d_instantiate = smack_d_instantiate,
3488
3489 .getprocattr = smack_getprocattr,
3490 .setprocattr = smack_setprocattr,
3491
3492 .unix_stream_connect = smack_unix_stream_connect,
3493 .unix_may_send = smack_unix_may_send,
3494
3495 .socket_post_create = smack_socket_post_create,
6d3dc07c
CS		 3496 .socket_connect = smack_socket_connect,
3497 .socket_sendmsg = smack_socket_sendmsg,
e114e473
CS		 3498 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3499 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3500 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3501 .sk_alloc_security = smack_sk_alloc_security,
3502 .sk_free_security = smack_sk_free_security,
3503 .sock_graft = smack_sock_graft,
3504 .inet_conn_request = smack_inet_conn_request,
07feee8f 3505 .inet_csk_clone = smack_inet_csk_clone,
d20bdda6 3506
e114e473
CS		 3507 /* key management security hooks */
3508#ifdef CONFIG_KEYS
3509 .key_alloc = smack_key_alloc,
3510 .key_free = smack_key_free,
3511 .key_permission = smack_key_permission,
3512#endif /* CONFIG_KEYS */
d20bdda6
AD		 3513
3514 /* Audit hooks */
3515#ifdef CONFIG_AUDIT
3516 .audit_rule_init = smack_audit_rule_init,
3517 .audit_rule_known = smack_audit_rule_known,
3518 .audit_rule_match = smack_audit_rule_match,
3519 .audit_rule_free = smack_audit_rule_free,
3520#endif /* CONFIG_AUDIT */
3521
e114e473 3522 .secid_to_secctx = smack_secid_to_secctx,
4bc87e62 3523 .secctx_to_secid = smack_secctx_to_secid,
e114e473 3524 .release_secctx = smack_release_secctx,
1ee65e37
DQ		 3525 .inode_notifysecctx = smack_inode_notifysecctx,
3526 .inode_setsecctx = smack_inode_setsecctx,
3527 .inode_getsecctx = smack_inode_getsecctx,
e114e473
CS		 3528};
3529
7198e2ee
EB		 3530
3531static __init void init_smack_know_list(void)
3532{
3533 list_add(&smack_known_huh.list, &smack_known_list);
3534 list_add(&smack_known_hat.list, &smack_known_list);
3535 list_add(&smack_known_star.list, &smack_known_list);
3536 list_add(&smack_known_floor.list, &smack_known_list);
3537 list_add(&smack_known_invalid.list, &smack_known_list);
3538 list_add(&smack_known_web.list, &smack_known_list);
3539}
3540
e114e473
CS		 3541/**
3542 * smack_init - initialize the smack system
3543 *
3544 * Returns 0
3545 */
3546static __init int smack_init(void)
3547{
d84f4f99 3548 struct cred *cred;
676dac4b 3549 struct task_smack *tsp;
d84f4f99 3550
7898e1f8
CS		 3551 if (!security_module_enable(&smack_ops))
3552 return 0;
3553
3554 tsp = new_task_smack(smack_known_floor.smk_known,
3555 smack_known_floor.smk_known, GFP_KERNEL);
676dac4b
CS		 3556 if (tsp == NULL)
3557 return -ENOMEM;
3558
e114e473
CS		 3559 printk(KERN_INFO "Smack: Initializing.\n");
3560
3561 /*
3562 * Set the security state for the initial task.
3563 */
d84f4f99 3564 cred = (struct cred *) current->cred;
676dac4b 3565 cred->security = tsp;
e114e473 3566
421f91d2 3567 /* initialize the smack_know_list */
7198e2ee 3568 init_smack_know_list();
e114e473
CS		 3569 /*
3570 * Initialize locks
3571 */
e114e473
CS		 3572 spin_lock_init(&smack_known_huh.smk_cipsolock);
3573 spin_lock_init(&smack_known_hat.smk_cipsolock);
3574 spin_lock_init(&smack_known_star.smk_cipsolock);
3575 spin_lock_init(&smack_known_floor.smk_cipsolock);
3576 spin_lock_init(&smack_known_invalid.smk_cipsolock);
3577
3578 /*
3579 * Register with LSM
3580 */
3581 if (register_security(&smack_ops))
3582 panic("smack: Unable to register with kernel.\n");
3583
3584 return 0;
3585}
3586
3587/*
3588 * Smack requires early initialization in order to label
3589 * all processes and objects when they are created.
3590 */
3591security_initcall(smack_init);
Linux 6.x block layer and io_uring tree(s)