2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
46 #define task_security(task) (task_cred_xxx((task), security))
48 #define TRANS_TRUE "TRUE"
49 #define TRANS_TRUE_SIZE 4
51 #define SMK_CONNECTING 0
52 #define SMK_RECEIVING 1
55 LIST_HEAD(smk_ipv6_port_list);
58 * smk_fetch - Fetch the smack label from a file.
59 * @ip: a pointer to the inode
60 * @dp: a pointer to the dentry
62 * Returns a pointer to the master list entry for the Smack label
63 * or NULL if there was no label to fetch.
65 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
70 struct smack_known *skp = NULL;
72 if (ip->i_op->getxattr == NULL)
75 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
79 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
81 skp = smk_import_entry(buffer, rc);
89 * new_inode_smack - allocate an inode security blob
90 * @smack: a pointer to the Smack label to use in the blob
92 * Returns the new blob or NULL if there's no memory available
94 struct inode_smack *new_inode_smack(char *smack)
96 struct inode_smack *isp;
98 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
102 isp->smk_inode = smack;
104 mutex_init(&isp->smk_lock);
110 * new_task_smack - allocate a task security blob
111 * @smack: a pointer to the Smack label to use in the blob
113 * Returns the new blob or NULL if there's no memory available
115 static struct task_smack *new_task_smack(struct smack_known *task,
116 struct smack_known *forked, gfp_t gfp)
118 struct task_smack *tsp;
120 tsp = kzalloc(sizeof(struct task_smack), gfp);
124 tsp->smk_task = task;
125 tsp->smk_forked = forked;
126 INIT_LIST_HEAD(&tsp->smk_rules);
127 mutex_init(&tsp->smk_rules_lock);
133 * smk_copy_rules - copy a rule set
134 * @nhead - new rules header pointer
135 * @ohead - old rules header pointer
137 * Returns 0 on success, -ENOMEM on error
139 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
142 struct smack_rule *nrp;
143 struct smack_rule *orp;
146 INIT_LIST_HEAD(nhead);
148 list_for_each_entry_rcu(orp, ohead, list) {
149 nrp = kzalloc(sizeof(struct smack_rule), gfp);
155 list_add_rcu(&nrp->list, nhead);
161 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
162 * @mode - input mode in form of PTRACE_MODE_*
164 * Returns a converted MAY_* mode usable by smack rules
166 static inline unsigned int smk_ptrace_mode(unsigned int mode)
169 case PTRACE_MODE_READ:
171 case PTRACE_MODE_ATTACH:
172 return MAY_READWRITE;
179 * smk_ptrace_rule_check - helper for ptrace access
180 * @tracer: tracer process
181 * @tracee_label: label of the process that's about to be traced,
182 * the pointer must originate from smack structures
183 * @mode: ptrace attachment mode (PTRACE_MODE_*)
184 * @func: name of the function that called us, used for audit
186 * Returns 0 on access granted, -error on error
188 static int smk_ptrace_rule_check(struct task_struct *tracer, char *tracee_label,
189 unsigned int mode, const char *func)
192 struct smk_audit_info ad, *saip = NULL;
193 struct task_smack *tsp;
194 struct smack_known *skp;
196 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
197 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
198 smk_ad_setfield_u_tsk(&ad, tracer);
202 tsp = task_security(tracer);
203 skp = smk_of_task(tsp);
205 if ((mode & PTRACE_MODE_ATTACH) &&
206 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
207 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
208 if (skp->smk_known == tracee_label)
210 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
212 else if (capable(CAP_SYS_PTRACE))
218 smack_log(skp->smk_known, tracee_label, 0, rc, saip);
223 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
224 rc = smk_tskacc(tsp, tracee_label, smk_ptrace_mode(mode), saip);
230 * We he, that is fun!
234 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
235 * @ctp: child task pointer
236 * @mode: ptrace attachment mode (PTRACE_MODE_*)
238 * Returns 0 if access is OK, an error code otherwise
240 * Do the capability checks.
242 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
245 struct smack_known *skp;
247 rc = cap_ptrace_access_check(ctp, mode);
251 skp = smk_of_task(task_security(ctp));
253 rc = smk_ptrace_rule_check(current, skp->smk_known, mode, __func__);
258 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
259 * @ptp: parent task pointer
261 * Returns 0 if access is OK, an error code otherwise
263 * Do the capability checks, and require PTRACE_MODE_ATTACH.
265 static int smack_ptrace_traceme(struct task_struct *ptp)
268 struct smack_known *skp;
270 rc = cap_ptrace_traceme(ptp);
274 skp = smk_of_task(current_security());
276 rc = smk_ptrace_rule_check(ptp, skp->smk_known,
277 PTRACE_MODE_ATTACH, __func__);
282 * smack_syslog - Smack approval on syslog
283 * @type: message type
285 * Returns 0 on success, error code otherwise.
287 static int smack_syslog(int typefrom_file)
290 struct smack_known *skp = smk_of_current();
292 if (smack_privileged(CAP_MAC_OVERRIDE))
295 if (smack_syslog_label != NULL && smack_syslog_label != skp)
307 * smack_sb_alloc_security - allocate a superblock blob
308 * @sb: the superblock getting the blob
310 * Returns 0 on success or -ENOMEM on error.
312 static int smack_sb_alloc_security(struct super_block *sb)
314 struct superblock_smack *sbsp;
316 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
321 sbsp->smk_root = smack_known_floor.smk_known;
322 sbsp->smk_default = smack_known_floor.smk_known;
323 sbsp->smk_floor = smack_known_floor.smk_known;
324 sbsp->smk_hat = smack_known_hat.smk_known;
326 * smk_initialized will be zero from kzalloc.
328 sb->s_security = sbsp;
334 * smack_sb_free_security - free a superblock blob
335 * @sb: the superblock getting the blob
338 static void smack_sb_free_security(struct super_block *sb)
340 kfree(sb->s_security);
341 sb->s_security = NULL;
345 * smack_sb_copy_data - copy mount options data for processing
346 * @orig: where to start
347 * @smackopts: mount options string
349 * Returns 0 on success or -ENOMEM on error.
351 * Copy the Smack specific mount options out of the mount
354 static int smack_sb_copy_data(char *orig, char *smackopts)
356 char *cp, *commap, *otheropts, *dp;
358 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
359 if (otheropts == NULL)
362 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
363 if (strstr(cp, SMK_FSDEFAULT) == cp)
365 else if (strstr(cp, SMK_FSFLOOR) == cp)
367 else if (strstr(cp, SMK_FSHAT) == cp)
369 else if (strstr(cp, SMK_FSROOT) == cp)
371 else if (strstr(cp, SMK_FSTRANS) == cp)
376 commap = strchr(cp, ',');
385 strcpy(orig, otheropts);
386 free_page((unsigned long)otheropts);
392 * smack_sb_kern_mount - Smack specific mount processing
393 * @sb: the file system superblock
394 * @flags: the mount flags
395 * @data: the smack mount options
397 * Returns 0 on success, an error code on failure
399 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
401 struct dentry *root = sb->s_root;
402 struct inode *inode = root->d_inode;
403 struct superblock_smack *sp = sb->s_security;
404 struct inode_smack *isp;
405 struct smack_known *skp;
412 if (sp->smk_initialized)
415 sp->smk_initialized = 1;
417 for (op = data; op != NULL; op = commap) {
418 commap = strchr(op, ',');
422 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
423 op += strlen(SMK_FSHAT);
424 nsp = smk_import(op, 0);
429 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
430 op += strlen(SMK_FSFLOOR);
431 nsp = smk_import(op, 0);
436 } else if (strncmp(op, SMK_FSDEFAULT,
437 strlen(SMK_FSDEFAULT)) == 0) {
438 op += strlen(SMK_FSDEFAULT);
439 nsp = smk_import(op, 0);
441 sp->smk_default = nsp;
444 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
445 op += strlen(SMK_FSROOT);
446 nsp = smk_import(op, 0);
451 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
452 op += strlen(SMK_FSTRANS);
453 nsp = smk_import(op, 0);
462 if (!smack_privileged(CAP_MAC_ADMIN)) {
464 * Unprivileged mounts don't get to specify Smack values.
469 * Unprivileged mounts get root and default from the caller.
471 skp = smk_of_current();
472 sp->smk_root = skp->smk_known;
473 sp->smk_default = skp->smk_known;
476 * Initialize the root inode.
478 isp = inode->i_security;
480 isp = new_inode_smack(sp->smk_root);
483 inode->i_security = isp;
485 isp->smk_inode = sp->smk_root;
488 isp->smk_flags |= SMK_INODE_TRANSMUTE;
494 * smack_sb_statfs - Smack check on statfs
495 * @dentry: identifies the file system in question
497 * Returns 0 if current can read the floor of the filesystem,
498 * and error code otherwise
500 static int smack_sb_statfs(struct dentry *dentry)
502 struct superblock_smack *sbp = dentry->d_sb->s_security;
504 struct smk_audit_info ad;
506 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
507 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
509 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
518 * smack_bprm_set_creds - set creds for exec
519 * @bprm: the exec information
521 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
523 static int smack_bprm_set_creds(struct linux_binprm *bprm)
525 struct inode *inode = file_inode(bprm->file);
526 struct task_smack *bsp = bprm->cred->security;
527 struct inode_smack *isp;
530 rc = cap_bprm_set_creds(bprm);
534 if (bprm->cred_prepared)
537 isp = inode->i_security;
538 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
541 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
542 struct task_struct *tracer;
546 tracer = ptrace_parent(current);
547 if (likely(tracer != NULL))
548 rc = smk_ptrace_rule_check(tracer,
549 isp->smk_task->smk_known,
556 } else if (bprm->unsafe)
559 bsp->smk_task = isp->smk_task;
560 bprm->per_clear |= PER_CLEAR_ON_SETID;
566 * smack_bprm_committing_creds - Prepare to install the new credentials
569 * @bprm: binprm for exec
571 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
573 struct task_smack *bsp = bprm->cred->security;
575 if (bsp->smk_task != bsp->smk_forked)
576 current->pdeath_signal = 0;
580 * smack_bprm_secureexec - Return the decision to use secureexec.
581 * @bprm: binprm for exec
583 * Returns 0 on success.
585 static int smack_bprm_secureexec(struct linux_binprm *bprm)
587 struct task_smack *tsp = current_security();
588 int ret = cap_bprm_secureexec(bprm);
590 if (!ret && (tsp->smk_task != tsp->smk_forked))
601 * smack_inode_alloc_security - allocate an inode blob
602 * @inode: the inode in need of a blob
604 * Returns 0 if it gets a blob, -ENOMEM otherwise
606 static int smack_inode_alloc_security(struct inode *inode)
608 struct smack_known *skp = smk_of_current();
610 inode->i_security = new_inode_smack(skp->smk_known);
611 if (inode->i_security == NULL)
617 * smack_inode_free_security - free an inode blob
618 * @inode: the inode with a blob
620 * Clears the blob pointer in inode
622 static void smack_inode_free_security(struct inode *inode)
624 kfree(inode->i_security);
625 inode->i_security = NULL;
629 * smack_inode_init_security - copy out the smack from an inode
633 * @name: where to put the attribute name
634 * @value: where to put the attribute value
635 * @len: where to put the length of the attribute
637 * Returns 0 if it all works out, -ENOMEM if there's no memory
639 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
640 const struct qstr *qstr, const char **name,
641 void **value, size_t *len)
643 struct inode_smack *issp = inode->i_security;
644 struct smack_known *skp = smk_of_current();
645 char *isp = smk_of_inode(inode);
646 char *dsp = smk_of_inode(dir);
650 *name = XATTR_SMACK_SUFFIX;
654 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
658 * If the access rule allows transmutation and
659 * the directory requests transmutation then
660 * by all means transmute.
661 * Mark the inode as changed.
663 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
664 smk_inode_transmutable(dir)) {
666 issp->smk_flags |= SMK_INODE_CHANGED;
669 *value = kstrdup(isp, GFP_NOFS);
681 * smack_inode_link - Smack check on link
682 * @old_dentry: the existing object
684 * @new_dentry: the new object
686 * Returns 0 if access is permitted, an error code otherwise
688 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
689 struct dentry *new_dentry)
692 struct smk_audit_info ad;
695 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
696 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
698 isp = smk_of_inode(old_dentry->d_inode);
699 rc = smk_curacc(isp, MAY_WRITE, &ad);
701 if (rc == 0 && new_dentry->d_inode != NULL) {
702 isp = smk_of_inode(new_dentry->d_inode);
703 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
704 rc = smk_curacc(isp, MAY_WRITE, &ad);
711 * smack_inode_unlink - Smack check on inode deletion
712 * @dir: containing directory object
713 * @dentry: file to unlink
715 * Returns 0 if current can write the containing directory
716 * and the object, error code otherwise
718 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
720 struct inode *ip = dentry->d_inode;
721 struct smk_audit_info ad;
724 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
725 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
728 * You need write access to the thing you're unlinking
730 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
733 * You also need write access to the containing directory
735 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
736 smk_ad_setfield_u_fs_inode(&ad, dir);
737 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
743 * smack_inode_rmdir - Smack check on directory deletion
744 * @dir: containing directory object
745 * @dentry: directory to unlink
747 * Returns 0 if current can write the containing directory
748 * and the directory, error code otherwise
750 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
752 struct smk_audit_info ad;
755 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
756 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
759 * You need write access to the thing you're removing
761 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
764 * You also need write access to the containing directory
766 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
767 smk_ad_setfield_u_fs_inode(&ad, dir);
768 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
775 * smack_inode_rename - Smack check on rename
776 * @old_inode: the old directory
777 * @old_dentry: unused
778 * @new_inode: the new directory
779 * @new_dentry: unused
781 * Read and write access is required on both the old and
784 * Returns 0 if access is permitted, an error code otherwise
786 static int smack_inode_rename(struct inode *old_inode,
787 struct dentry *old_dentry,
788 struct inode *new_inode,
789 struct dentry *new_dentry)
793 struct smk_audit_info ad;
795 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
796 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
798 isp = smk_of_inode(old_dentry->d_inode);
799 rc = smk_curacc(isp, MAY_READWRITE, &ad);
801 if (rc == 0 && new_dentry->d_inode != NULL) {
802 isp = smk_of_inode(new_dentry->d_inode);
803 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
804 rc = smk_curacc(isp, MAY_READWRITE, &ad);
810 * smack_inode_permission - Smack version of permission()
811 * @inode: the inode in question
812 * @mask: the access requested
814 * This is the important Smack hook.
816 * Returns 0 if access is permitted, -EACCES otherwise
818 static int smack_inode_permission(struct inode *inode, int mask)
820 struct smk_audit_info ad;
821 int no_block = mask & MAY_NOT_BLOCK;
823 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
825 * No permission to check. Existence test. Yup, it's there.
830 /* May be droppable after audit */
833 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
834 smk_ad_setfield_u_fs_inode(&ad, inode);
835 return smk_curacc(smk_of_inode(inode), mask, &ad);
839 * smack_inode_setattr - Smack check for setting attributes
840 * @dentry: the object
841 * @iattr: for the force flag
843 * Returns 0 if access is permitted, an error code otherwise
845 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
847 struct smk_audit_info ad;
849 * Need to allow for clearing the setuid bit.
851 if (iattr->ia_valid & ATTR_FORCE)
853 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
854 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
856 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
860 * smack_inode_getattr - Smack check for getting attributes
862 * @dentry: the object
864 * Returns 0 if access is permitted, an error code otherwise
866 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
868 struct smk_audit_info ad;
871 path.dentry = dentry;
874 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
875 smk_ad_setfield_u_fs_path(&ad, path);
876 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
880 * smack_inode_setxattr - Smack check for setting xattrs
881 * @dentry: the object
882 * @name: name of the attribute
887 * This protects the Smack attribute explicitly.
889 * Returns 0 if access is permitted, an error code otherwise
891 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
892 const void *value, size_t size, int flags)
894 struct smk_audit_info ad;
895 struct smack_known *skp;
897 int check_import = 0;
902 * Check label validity here so import won't fail in post_setxattr
904 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
905 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
906 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
909 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
910 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
914 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
916 if (size != TRANS_TRUE_SIZE ||
917 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
920 rc = cap_inode_setxattr(dentry, name, value, size, flags);
922 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
925 if (rc == 0 && check_import) {
926 skp = size ? smk_import_entry(value, size) : NULL;
927 if (skp == NULL || (check_star &&
928 (skp == &smack_known_star || skp == &smack_known_web)))
932 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
933 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
936 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
942 * smack_inode_post_setxattr - Apply the Smack update approved above
944 * @name: attribute name
945 * @value: attribute value
946 * @size: attribute size
949 * Set the pointer in the inode blob to the entry found
950 * in the master label list.
952 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
953 const void *value, size_t size, int flags)
955 struct smack_known *skp;
956 struct inode_smack *isp = dentry->d_inode->i_security;
958 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
959 isp->smk_flags |= SMK_INODE_TRANSMUTE;
963 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
964 skp = smk_import_entry(value, size);
966 isp->smk_inode = skp->smk_known;
968 isp->smk_inode = smack_known_invalid.smk_known;
969 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
970 skp = smk_import_entry(value, size);
974 isp->smk_task = &smack_known_invalid;
975 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
976 skp = smk_import_entry(value, size);
980 isp->smk_mmap = &smack_known_invalid;
987 * smack_inode_getxattr - Smack check on getxattr
988 * @dentry: the object
991 * Returns 0 if access is permitted, an error code otherwise
993 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
995 struct smk_audit_info ad;
997 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
998 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1000 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
1004 * smack_inode_removexattr - Smack check on removexattr
1005 * @dentry: the object
1006 * @name: name of the attribute
1008 * Removing the Smack attribute requires CAP_MAC_ADMIN
1010 * Returns 0 if access is permitted, an error code otherwise
1012 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1014 struct inode_smack *isp;
1015 struct smk_audit_info ad;
1018 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1019 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1020 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1021 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1022 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1023 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1024 if (!smack_privileged(CAP_MAC_ADMIN))
1027 rc = cap_inode_removexattr(dentry, name);
1032 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1033 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1035 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
1039 isp = dentry->d_inode->i_security;
1041 * Don't do anything special for these.
1042 * XATTR_NAME_SMACKIPIN
1043 * XATTR_NAME_SMACKIPOUT
1044 * XATTR_NAME_SMACKEXEC
1046 if (strcmp(name, XATTR_NAME_SMACK) == 0)
1047 isp->smk_task = NULL;
1048 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1049 isp->smk_mmap = NULL;
1050 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1051 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1057 * smack_inode_getsecurity - get smack xattrs
1058 * @inode: the object
1059 * @name: attribute name
1060 * @buffer: where to put the result
1063 * Returns the size of the attribute or an error code
1065 static int smack_inode_getsecurity(const struct inode *inode,
1066 const char *name, void **buffer,
1069 struct socket_smack *ssp;
1070 struct socket *sock;
1071 struct super_block *sbp;
1072 struct inode *ip = (struct inode *)inode;
1077 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1078 isp = smk_of_inode(inode);
1085 * The rest of the Smack xattrs are only on sockets.
1088 if (sbp->s_magic != SOCKFS_MAGIC)
1091 sock = SOCKET_I(ip);
1092 if (sock == NULL || sock->sk == NULL)
1095 ssp = sock->sk->sk_security;
1097 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1098 isp = ssp->smk_in->smk_known;
1099 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1100 isp = ssp->smk_out->smk_known;
1115 * smack_inode_listsecurity - list the Smack attributes
1116 * @inode: the object
1117 * @buffer: where they go
1118 * @buffer_size: size of buffer
1120 * Returns 0 on success, -EINVAL otherwise
1122 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1125 int len = sizeof(XATTR_NAME_SMACK);
1127 if (buffer != NULL && len <= buffer_size)
1128 memcpy(buffer, XATTR_NAME_SMACK, len);
1134 * smack_inode_getsecid - Extract inode's security id
1135 * @inode: inode to extract the info from
1136 * @secid: where result will be saved
1138 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1140 struct inode_smack *isp = inode->i_security;
1142 *secid = smack_to_secid(isp->smk_inode);
1150 * smack_file_permission - Smack check on file operations
1156 * Should access checks be done on each read or write?
1157 * UNICOS and SELinux say yes.
1158 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1160 * I'll say no for now. Smack does not do the frequent
1161 * label changing that SELinux does.
1163 static int smack_file_permission(struct file *file, int mask)
1169 * smack_file_alloc_security - assign a file security blob
1172 * The security blob for a file is a pointer to the master
1173 * label list, so no allocation is done.
1177 static int smack_file_alloc_security(struct file *file)
1179 struct smack_known *skp = smk_of_current();
1181 file->f_security = skp->smk_known;
1186 * smack_file_free_security - clear a file security blob
1189 * The security blob for a file is a pointer to the master
1190 * label list, so no memory is freed.
1192 static void smack_file_free_security(struct file *file)
1194 file->f_security = NULL;
1198 * smack_file_ioctl - Smack check on ioctls
1203 * Relies heavily on the correct use of the ioctl command conventions.
1205 * Returns 0 if allowed, error code otherwise
1207 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1211 struct smk_audit_info ad;
1213 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1214 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1216 if (_IOC_DIR(cmd) & _IOC_WRITE)
1217 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1219 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1220 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1226 * smack_file_lock - Smack check on file locking
1230 * Returns 0 if current has lock access, error code otherwise
1232 static int smack_file_lock(struct file *file, unsigned int cmd)
1234 struct smk_audit_info ad;
1236 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1237 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1238 return smk_curacc(file->f_security, MAY_LOCK, &ad);
1242 * smack_file_fcntl - Smack check on fcntl
1244 * @cmd: what action to check
1247 * Generally these operations are harmless.
1248 * File locking operations present an obvious mechanism
1249 * for passing information, so they require write access.
1251 * Returns 0 if current has access, error code otherwise
1253 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1256 struct smk_audit_info ad;
1265 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1266 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1267 rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
1271 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1272 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1273 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1284 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1285 * if mapping anonymous memory.
1286 * @file contains the file structure for file to map (may be NULL).
1287 * @reqprot contains the protection requested by the application.
1288 * @prot contains the protection that will be applied by the kernel.
1289 * @flags contains the operational flags.
1290 * Return 0 if permission is granted.
1292 static int smack_mmap_file(struct file *file,
1293 unsigned long reqprot, unsigned long prot,
1294 unsigned long flags)
1296 struct smack_known *skp;
1297 struct smack_known *mkp;
1298 struct smack_rule *srp;
1299 struct task_smack *tsp;
1301 struct inode_smack *isp;
1310 isp = file_inode(file)->i_security;
1311 if (isp->smk_mmap == NULL)
1313 mkp = isp->smk_mmap;
1315 tsp = current_security();
1316 skp = smk_of_current();
1321 * For each Smack rule associated with the subject
1322 * label verify that the SMACK64MMAP also has access
1323 * to that rule's object label.
1325 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1326 osmack = srp->smk_object;
1328 * Matching labels always allows access.
1330 if (mkp->smk_known == osmack)
1333 * If there is a matching local rule take
1334 * that into account as well.
1336 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
1339 may = srp->smk_access;
1341 may &= srp->smk_access;
1343 * If may is zero the SMACK64MMAP subject can't
1344 * possibly have less access.
1350 * Fetch the global list entry.
1351 * If there isn't one a SMACK64MMAP subject
1352 * can't have as much access as current.
1354 mmay = smk_access_entry(mkp->smk_known, osmack,
1356 if (mmay == -ENOENT) {
1361 * If there is a local entry it modifies the
1362 * potential access, too.
1364 tmay = smk_access_entry(mkp->smk_known, osmack,
1366 if (tmay != -ENOENT)
1370 * If there is any access available to current that is
1371 * not available to a SMACK64MMAP subject
1374 if ((may | mmay) != mmay) {
1386 * smack_file_set_fowner - set the file security blob value
1387 * @file: object in question
1390 * Further research may be required on this one.
1392 static int smack_file_set_fowner(struct file *file)
1394 struct smack_known *skp = smk_of_current();
1396 file->f_security = skp->smk_known;
1401 * smack_file_send_sigiotask - Smack on sigio
1402 * @tsk: The target task
1403 * @fown: the object the signal come from
1406 * Allow a privileged task to get signals even if it shouldn't
1408 * Returns 0 if a subject with the object's smack could
1409 * write to the task, an error code otherwise.
1411 static int smack_file_send_sigiotask(struct task_struct *tsk,
1412 struct fown_struct *fown, int signum)
1414 struct smack_known *skp;
1415 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1418 struct smk_audit_info ad;
1421 * struct fown_struct is never outside the context of a struct file
1423 file = container_of(fown, struct file, f_owner);
1425 /* we don't log here as rc can be overriden */
1426 skp = smk_find_entry(file->f_security);
1427 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
1428 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1431 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1432 smk_ad_setfield_u_tsk(&ad, tsk);
1433 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
1438 * smack_file_receive - Smack file receive check
1441 * Returns 0 if current has access, error code otherwise
1443 static int smack_file_receive(struct file *file)
1446 struct smk_audit_info ad;
1448 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1449 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1451 * This code relies on bitmasks.
1453 if (file->f_mode & FMODE_READ)
1455 if (file->f_mode & FMODE_WRITE)
1458 return smk_curacc(file->f_security, may, &ad);
1462 * smack_file_open - Smack dentry open processing
1464 * @cred: task credential
1466 * Set the security blob in the file structure.
1467 * Allow the open only if the task has read access. There are
1468 * many read operations (e.g. fstat) that you can do with an
1469 * fd even if you have the file open write-only.
1473 static int smack_file_open(struct file *file, const struct cred *cred)
1475 struct task_smack *tsp = cred->security;
1476 struct inode_smack *isp = file_inode(file)->i_security;
1477 struct smk_audit_info ad;
1480 if (smack_privileged(CAP_MAC_OVERRIDE))
1483 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1484 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1485 rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad);
1487 file->f_security = isp->smk_inode;
1497 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1498 * @new: the new credentials
1499 * @gfp: the atomicity of any memory allocations
1501 * Prepare a blank set of credentials for modification. This must allocate all
1502 * the memory the LSM module might require such that cred_transfer() can
1503 * complete without error.
1505 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1507 struct task_smack *tsp;
1509 tsp = new_task_smack(NULL, NULL, gfp);
1513 cred->security = tsp;
1520 * smack_cred_free - "free" task-level security credentials
1521 * @cred: the credentials in question
1524 static void smack_cred_free(struct cred *cred)
1526 struct task_smack *tsp = cred->security;
1527 struct smack_rule *rp;
1528 struct list_head *l;
1529 struct list_head *n;
1533 cred->security = NULL;
1535 list_for_each_safe(l, n, &tsp->smk_rules) {
1536 rp = list_entry(l, struct smack_rule, list);
1537 list_del(&rp->list);
1544 * smack_cred_prepare - prepare new set of credentials for modification
1545 * @new: the new credentials
1546 * @old: the original credentials
1547 * @gfp: the atomicity of any memory allocations
1549 * Prepare a new set of credentials for modification.
1551 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1554 struct task_smack *old_tsp = old->security;
1555 struct task_smack *new_tsp;
1558 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1559 if (new_tsp == NULL)
1562 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1566 new->security = new_tsp;
1571 * smack_cred_transfer - Transfer the old credentials to the new credentials
1572 * @new: the new credentials
1573 * @old: the original credentials
1575 * Fill in a set of blank credentials from another set of credentials.
1577 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1579 struct task_smack *old_tsp = old->security;
1580 struct task_smack *new_tsp = new->security;
1582 new_tsp->smk_task = old_tsp->smk_task;
1583 new_tsp->smk_forked = old_tsp->smk_task;
1584 mutex_init(&new_tsp->smk_rules_lock);
1585 INIT_LIST_HEAD(&new_tsp->smk_rules);
1588 /* cbs copy rule list */
1592 * smack_kernel_act_as - Set the subjective context in a set of credentials
1593 * @new: points to the set of credentials to be modified.
1594 * @secid: specifies the security ID to be set
1596 * Set the security data for a kernel service.
1598 static int smack_kernel_act_as(struct cred *new, u32 secid)
1600 struct task_smack *new_tsp = new->security;
1601 struct smack_known *skp = smack_from_secid(secid);
1606 new_tsp->smk_task = skp;
1611 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1612 * @new: points to the set of credentials to be modified
1613 * @inode: points to the inode to use as a reference
1615 * Set the file creation context in a set of credentials to the same
1616 * as the objective context of the specified inode
1618 static int smack_kernel_create_files_as(struct cred *new,
1619 struct inode *inode)
1621 struct inode_smack *isp = inode->i_security;
1622 struct task_smack *tsp = new->security;
1624 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1625 tsp->smk_task = tsp->smk_forked;
1630 * smk_curacc_on_task - helper to log task related access
1631 * @p: the task object
1632 * @access: the access requested
1633 * @caller: name of the calling function for audit
1635 * Return 0 if access is permitted
1637 static int smk_curacc_on_task(struct task_struct *p, int access,
1640 struct smk_audit_info ad;
1641 struct smack_known *skp = smk_of_task(task_security(p));
1643 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1644 smk_ad_setfield_u_tsk(&ad, p);
1645 return smk_curacc(skp->smk_known, access, &ad);
1649 * smack_task_setpgid - Smack check on setting pgid
1650 * @p: the task object
1653 * Return 0 if write access is permitted
1655 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1657 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1661 * smack_task_getpgid - Smack access check for getpgid
1662 * @p: the object task
1664 * Returns 0 if current can read the object task, error code otherwise
1666 static int smack_task_getpgid(struct task_struct *p)
1668 return smk_curacc_on_task(p, MAY_READ, __func__);
1672 * smack_task_getsid - Smack access check for getsid
1673 * @p: the object task
1675 * Returns 0 if current can read the object task, error code otherwise
1677 static int smack_task_getsid(struct task_struct *p)
1679 return smk_curacc_on_task(p, MAY_READ, __func__);
1683 * smack_task_getsecid - get the secid of the task
1684 * @p: the object task
1685 * @secid: where to put the result
1687 * Sets the secid to contain a u32 version of the smack label.
1689 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1691 struct smack_known *skp = smk_of_task(task_security(p));
1693 *secid = skp->smk_secid;
1697 * smack_task_setnice - Smack check on setting nice
1698 * @p: the task object
1701 * Return 0 if write access is permitted
1703 static int smack_task_setnice(struct task_struct *p, int nice)
1707 rc = cap_task_setnice(p, nice);
1709 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1714 * smack_task_setioprio - Smack check on setting ioprio
1715 * @p: the task object
1718 * Return 0 if write access is permitted
1720 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1724 rc = cap_task_setioprio(p, ioprio);
1726 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1731 * smack_task_getioprio - Smack check on reading ioprio
1732 * @p: the task object
1734 * Return 0 if read access is permitted
1736 static int smack_task_getioprio(struct task_struct *p)
1738 return smk_curacc_on_task(p, MAY_READ, __func__);
1742 * smack_task_setscheduler - Smack check on setting scheduler
1743 * @p: the task object
1747 * Return 0 if read access is permitted
1749 static int smack_task_setscheduler(struct task_struct *p)
1753 rc = cap_task_setscheduler(p);
1755 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1760 * smack_task_getscheduler - Smack check on reading scheduler
1761 * @p: the task object
1763 * Return 0 if read access is permitted
1765 static int smack_task_getscheduler(struct task_struct *p)
1767 return smk_curacc_on_task(p, MAY_READ, __func__);
1771 * smack_task_movememory - Smack check on moving memory
1772 * @p: the task object
1774 * Return 0 if write access is permitted
1776 static int smack_task_movememory(struct task_struct *p)
1778 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1782 * smack_task_kill - Smack check on signal delivery
1783 * @p: the task object
1786 * @secid: identifies the smack to use in lieu of current's
1788 * Return 0 if write access is permitted
1790 * The secid behavior is an artifact of an SELinux hack
1791 * in the USB code. Someday it may go away.
1793 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1796 struct smk_audit_info ad;
1797 struct smack_known *skp;
1798 struct smack_known *tkp = smk_of_task(task_security(p));
1800 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1801 smk_ad_setfield_u_tsk(&ad, p);
1803 * Sending a signal requires that the sender
1804 * can write the receiver.
1807 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
1809 * If the secid isn't 0 we're dealing with some USB IO
1810 * specific behavior. This is not clean. For one thing
1811 * we can't take privilege into account.
1813 skp = smack_from_secid(secid);
1814 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
1818 * smack_task_wait - Smack access check for waiting
1819 * @p: task to wait for
1823 static int smack_task_wait(struct task_struct *p)
1826 * Allow the operation to succeed.
1828 * In userless environments (e.g. phones) programs
1829 * get marked with SMACK64EXEC and even if the parent
1830 * and child shouldn't be talking the parent still
1831 * may expect to know when the child exits.
1837 * smack_task_to_inode - copy task smack into the inode blob
1838 * @p: task to copy from
1839 * @inode: inode to copy to
1841 * Sets the smack pointer in the inode security blob
1843 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1845 struct inode_smack *isp = inode->i_security;
1846 struct smack_known *skp = smk_of_task(task_security(p));
1848 isp->smk_inode = skp->smk_known;
1856 * smack_sk_alloc_security - Allocate a socket blob
1859 * @gfp_flags: memory allocation flags
1861 * Assign Smack pointers to current
1863 * Returns 0 on success, -ENOMEM is there's no memory
1865 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1867 struct smack_known *skp = smk_of_current();
1868 struct socket_smack *ssp;
1870 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1876 ssp->smk_packet = NULL;
1878 sk->sk_security = ssp;
1884 * smack_sk_free_security - Free a socket blob
1887 * Clears the blob pointer
1889 static void smack_sk_free_security(struct sock *sk)
1891 kfree(sk->sk_security);
1895 * smack_host_label - check host based restrictions
1896 * @sip: the object end
1898 * looks for host based access restrictions
1900 * This version will only be appropriate for really small sets of single label
1901 * hosts. The caller is responsible for ensuring that the RCU read lock is
1902 * taken before calling this function.
1904 * Returns the label of the far end or NULL if it's not special.
1906 static char *smack_host_label(struct sockaddr_in *sip)
1908 struct smk_netlbladdr *snp;
1909 struct in_addr *siap = &sip->sin_addr;
1911 if (siap->s_addr == 0)
1914 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1916 * we break after finding the first match because
1917 * the list is sorted from longest to shortest mask
1918 * so we have found the most specific match
1920 if ((&snp->smk_host.sin_addr)->s_addr ==
1921 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1922 /* we have found the special CIPSO option */
1923 if (snp->smk_label == smack_cipso_option)
1925 return snp->smk_label;
1932 * smack_netlabel - Set the secattr on a socket
1934 * @labeled: socket label scheme
1936 * Convert the outbound smack value (smk_out) to a
1937 * secattr and attach it to the socket.
1939 * Returns 0 on success or an error code
1941 static int smack_netlabel(struct sock *sk, int labeled)
1943 struct smack_known *skp;
1944 struct socket_smack *ssp = sk->sk_security;
1948 * Usually the netlabel code will handle changing the
1949 * packet labeling based on the label.
1950 * The case of a single label host is different, because
1951 * a single label host should never get a labeled packet
1952 * even though the label is usually associated with a packet
1956 bh_lock_sock_nested(sk);
1958 if (ssp->smk_out == smack_net_ambient ||
1959 labeled == SMACK_UNLABELED_SOCKET)
1960 netlbl_sock_delattr(sk);
1963 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1973 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1975 * @sap: the destination address
1977 * Set the correct secattr for the given socket based on the destination
1978 * address and perform any outbound access checks needed.
1980 * Returns 0 on success or an error code.
1983 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1985 struct smack_known *skp;
1989 struct socket_smack *ssp = sk->sk_security;
1990 struct smk_audit_info ad;
1993 hostsp = smack_host_label(sap);
1994 if (hostsp != NULL) {
1996 struct lsm_network_audit net;
1998 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1999 ad.a.u.net->family = sap->sin_family;
2000 ad.a.u.net->dport = sap->sin_port;
2001 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2003 sk_lbl = SMACK_UNLABELED_SOCKET;
2005 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
2007 sk_lbl = SMACK_CIPSO_SOCKET;
2014 return smack_netlabel(sk, sk_lbl);
2018 * smk_ipv6_port_label - Smack port access table management
2022 * Create or update the port list entry
2024 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2026 struct sock *sk = sock->sk;
2027 struct sockaddr_in6 *addr6;
2028 struct socket_smack *ssp = sock->sk->sk_security;
2029 struct smk_port_label *spp;
2030 unsigned short port = 0;
2032 if (address == NULL) {
2034 * This operation is changing the Smack information
2035 * on the bound socket. Take the changes to the port
2038 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2039 if (sk != spp->smk_sock)
2041 spp->smk_in = ssp->smk_in;
2042 spp->smk_out = ssp->smk_out;
2046 * A NULL address is only used for updating existing
2047 * bound entries. If there isn't one, it's OK.
2052 addr6 = (struct sockaddr_in6 *)address;
2053 port = ntohs(addr6->sin6_port);
2055 * This is a special case that is safely ignored.
2061 * Look for an existing port list entry.
2062 * This is an indication that a port is getting reused.
2064 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2065 if (spp->smk_port != port)
2067 spp->smk_port = port;
2069 spp->smk_in = ssp->smk_in;
2070 spp->smk_out = ssp->smk_out;
2075 * A new port entry is required.
2077 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2081 spp->smk_port = port;
2083 spp->smk_in = ssp->smk_in;
2084 spp->smk_out = ssp->smk_out;
2086 list_add(&spp->list, &smk_ipv6_port_list);
2091 * smk_ipv6_port_check - check Smack port access
2095 * Create or update the port list entry
2097 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2102 struct smk_port_label *spp;
2103 struct socket_smack *ssp = sk->sk_security;
2104 struct smack_known *skp;
2105 unsigned short port = 0;
2107 struct smk_audit_info ad;
2109 struct lsm_network_audit net;
2112 if (act == SMK_RECEIVING) {
2113 skp = smack_net_ambient;
2114 object = ssp->smk_in->smk_known;
2117 object = smack_net_ambient->smk_known;
2121 * Get the IP address and port from the address.
2123 port = ntohs(address->sin6_port);
2124 bep = (__be16 *)(&address->sin6_addr);
2125 be32p = (__be32 *)(&address->sin6_addr);
2128 * It's remote, so port lookup does no good.
2130 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2134 * It's local so the send check has to have passed.
2136 if (act == SMK_RECEIVING) {
2137 skp = &smack_known_web;
2141 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2142 if (spp->smk_port != port)
2144 object = spp->smk_in->smk_known;
2145 if (act == SMK_CONNECTING)
2146 ssp->smk_packet = spp->smk_out;
2153 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2154 ad.a.u.net->family = sk->sk_family;
2155 ad.a.u.net->dport = port;
2156 if (act == SMK_RECEIVING)
2157 ad.a.u.net->v6info.saddr = address->sin6_addr;
2159 ad.a.u.net->v6info.daddr = address->sin6_addr;
2161 return smk_access(skp, object, MAY_WRITE, &ad);
2165 * smack_inode_setsecurity - set smack xattrs
2166 * @inode: the object
2167 * @name: attribute name
2168 * @value: attribute value
2169 * @size: size of the attribute
2172 * Sets the named attribute in the appropriate blob
2174 * Returns 0 on success, or an error code
2176 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2177 const void *value, size_t size, int flags)
2179 struct smack_known *skp;
2180 struct inode_smack *nsp = inode->i_security;
2181 struct socket_smack *ssp;
2182 struct socket *sock;
2185 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2188 skp = smk_import_entry(value, size);
2192 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2193 nsp->smk_inode = skp->smk_known;
2194 nsp->smk_flags |= SMK_INODE_INSTANT;
2198 * The rest of the Smack xattrs are only on sockets.
2200 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2203 sock = SOCKET_I(inode);
2204 if (sock == NULL || sock->sk == NULL)
2207 ssp = sock->sk->sk_security;
2209 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2211 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2213 if (sock->sk->sk_family == PF_INET) {
2214 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2217 "Smack: \"%s\" netlbl error %d.\n",
2223 if (sock->sk->sk_family == PF_INET6)
2224 smk_ipv6_port_label(sock, NULL);
2230 * smack_socket_post_create - finish socket setup
2232 * @family: protocol family
2237 * Sets the netlabel information on the socket
2239 * Returns 0 on success, and error code otherwise
2241 static int smack_socket_post_create(struct socket *sock, int family,
2242 int type, int protocol, int kern)
2244 if (family != PF_INET || sock->sk == NULL)
2247 * Set the outbound netlbl.
2249 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2253 * smack_socket_bind - record port binding information.
2255 * @address: the port address
2256 * @addrlen: size of the address
2258 * Records the label bound to a port.
2262 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2265 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2266 smk_ipv6_port_label(sock, address);
2272 * smack_socket_connect - connect access check
2274 * @sap: the other end
2275 * @addrlen: size of sap
2277 * Verifies that a connection may be possible
2279 * Returns 0 on success, and error code otherwise
2281 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2286 if (sock->sk == NULL)
2289 switch (sock->sk->sk_family) {
2291 if (addrlen < sizeof(struct sockaddr_in))
2293 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2296 if (addrlen < sizeof(struct sockaddr_in6))
2298 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2306 * smack_flags_to_may - convert S_ to MAY_ values
2307 * @flags: the S_ value
2309 * Returns the equivalent MAY_ value
2311 static int smack_flags_to_may(int flags)
2315 if (flags & S_IRUGO)
2317 if (flags & S_IWUGO)
2319 if (flags & S_IXUGO)
2326 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2331 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2333 struct smack_known *skp = smk_of_current();
2335 msg->security = skp->smk_known;
2340 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2343 * Clears the blob pointer
2345 static void smack_msg_msg_free_security(struct msg_msg *msg)
2347 msg->security = NULL;
2351 * smack_of_shm - the smack pointer for the shm
2354 * Returns a pointer to the smack value
2356 static char *smack_of_shm(struct shmid_kernel *shp)
2358 return (char *)shp->shm_perm.security;
2362 * smack_shm_alloc_security - Set the security blob for shm
2367 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2369 struct kern_ipc_perm *isp = &shp->shm_perm;
2370 struct smack_known *skp = smk_of_current();
2372 isp->security = skp->smk_known;
2377 * smack_shm_free_security - Clear the security blob for shm
2380 * Clears the blob pointer
2382 static void smack_shm_free_security(struct shmid_kernel *shp)
2384 struct kern_ipc_perm *isp = &shp->shm_perm;
2386 isp->security = NULL;
2390 * smk_curacc_shm : check if current has access on shm
2392 * @access : access requested
2394 * Returns 0 if current has the requested access, error code otherwise
2396 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2398 char *ssp = smack_of_shm(shp);
2399 struct smk_audit_info ad;
2402 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2403 ad.a.u.ipc_id = shp->shm_perm.id;
2405 return smk_curacc(ssp, access, &ad);
2409 * smack_shm_associate - Smack access check for shm
2411 * @shmflg: access requested
2413 * Returns 0 if current has the requested access, error code otherwise
2415 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2419 may = smack_flags_to_may(shmflg);
2420 return smk_curacc_shm(shp, may);
2424 * smack_shm_shmctl - Smack access check for shm
2426 * @cmd: what it wants to do
2428 * Returns 0 if current has the requested access, error code otherwise
2430 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2443 may = MAY_READWRITE;
2448 * System level information.
2454 return smk_curacc_shm(shp, may);
2458 * smack_shm_shmat - Smack access for shmat
2461 * @shmflg: access requested
2463 * Returns 0 if current has the requested access, error code otherwise
2465 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2470 may = smack_flags_to_may(shmflg);
2471 return smk_curacc_shm(shp, may);
2475 * smack_of_sem - the smack pointer for the sem
2478 * Returns a pointer to the smack value
2480 static char *smack_of_sem(struct sem_array *sma)
2482 return (char *)sma->sem_perm.security;
2486 * smack_sem_alloc_security - Set the security blob for sem
2491 static int smack_sem_alloc_security(struct sem_array *sma)
2493 struct kern_ipc_perm *isp = &sma->sem_perm;
2494 struct smack_known *skp = smk_of_current();
2496 isp->security = skp->smk_known;
2501 * smack_sem_free_security - Clear the security blob for sem
2504 * Clears the blob pointer
2506 static void smack_sem_free_security(struct sem_array *sma)
2508 struct kern_ipc_perm *isp = &sma->sem_perm;
2510 isp->security = NULL;
2514 * smk_curacc_sem : check if current has access on sem
2516 * @access : access requested
2518 * Returns 0 if current has the requested access, error code otherwise
2520 static int smk_curacc_sem(struct sem_array *sma, int access)
2522 char *ssp = smack_of_sem(sma);
2523 struct smk_audit_info ad;
2526 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2527 ad.a.u.ipc_id = sma->sem_perm.id;
2529 return smk_curacc(ssp, access, &ad);
2533 * smack_sem_associate - Smack access check for sem
2535 * @semflg: access requested
2537 * Returns 0 if current has the requested access, error code otherwise
2539 static int smack_sem_associate(struct sem_array *sma, int semflg)
2543 may = smack_flags_to_may(semflg);
2544 return smk_curacc_sem(sma, may);
2548 * smack_sem_shmctl - Smack access check for sem
2550 * @cmd: what it wants to do
2552 * Returns 0 if current has the requested access, error code otherwise
2554 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2572 may = MAY_READWRITE;
2577 * System level information
2584 return smk_curacc_sem(sma, may);
2588 * smack_sem_semop - Smack checks of semaphore operations
2594 * Treated as read and write in all cases.
2596 * Returns 0 if access is allowed, error code otherwise
2598 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2599 unsigned nsops, int alter)
2601 return smk_curacc_sem(sma, MAY_READWRITE);
2605 * smack_msg_alloc_security - Set the security blob for msg
2610 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2612 struct kern_ipc_perm *kisp = &msq->q_perm;
2613 struct smack_known *skp = smk_of_current();
2615 kisp->security = skp->smk_known;
2620 * smack_msg_free_security - Clear the security blob for msg
2623 * Clears the blob pointer
2625 static void smack_msg_queue_free_security(struct msg_queue *msq)
2627 struct kern_ipc_perm *kisp = &msq->q_perm;
2629 kisp->security = NULL;
2633 * smack_of_msq - the smack pointer for the msq
2636 * Returns a pointer to the smack value
2638 static char *smack_of_msq(struct msg_queue *msq)
2640 return (char *)msq->q_perm.security;
2644 * smk_curacc_msq : helper to check if current has access on msq
2646 * @access : access requested
2648 * return 0 if current has access, error otherwise
2650 static int smk_curacc_msq(struct msg_queue *msq, int access)
2652 char *msp = smack_of_msq(msq);
2653 struct smk_audit_info ad;
2656 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2657 ad.a.u.ipc_id = msq->q_perm.id;
2659 return smk_curacc(msp, access, &ad);
2663 * smack_msg_queue_associate - Smack access check for msg_queue
2665 * @msqflg: access requested
2667 * Returns 0 if current has the requested access, error code otherwise
2669 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2673 may = smack_flags_to_may(msqflg);
2674 return smk_curacc_msq(msq, may);
2678 * smack_msg_queue_msgctl - Smack access check for msg_queue
2680 * @cmd: what it wants to do
2682 * Returns 0 if current has the requested access, error code otherwise
2684 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2695 may = MAY_READWRITE;
2700 * System level information
2707 return smk_curacc_msq(msq, may);
2711 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2714 * @msqflg: access requested
2716 * Returns 0 if current has the requested access, error code otherwise
2718 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2723 may = smack_flags_to_may(msqflg);
2724 return smk_curacc_msq(msq, may);
2728 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2735 * Returns 0 if current has read and write access, error code otherwise
2737 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2738 struct task_struct *target, long type, int mode)
2740 return smk_curacc_msq(msq, MAY_READWRITE);
2744 * smack_ipc_permission - Smack access for ipc_permission()
2745 * @ipp: the object permissions
2746 * @flag: access requested
2748 * Returns 0 if current has read and write access, error code otherwise
2750 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2752 char *isp = ipp->security;
2753 int may = smack_flags_to_may(flag);
2754 struct smk_audit_info ad;
2757 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2758 ad.a.u.ipc_id = ipp->id;
2760 return smk_curacc(isp, may, &ad);
2764 * smack_ipc_getsecid - Extract smack security id
2765 * @ipp: the object permissions
2766 * @secid: where result will be saved
2768 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2770 char *smack = ipp->security;
2772 *secid = smack_to_secid(smack);
2776 * smack_d_instantiate - Make sure the blob is correct on an inode
2777 * @opt_dentry: dentry where inode will be attached
2778 * @inode: the object
2780 * Set the inode's security blob if it hasn't been done already.
2782 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2784 struct super_block *sbp;
2785 struct superblock_smack *sbsp;
2786 struct inode_smack *isp;
2787 struct smack_known *skp;
2788 struct smack_known *ckp = smk_of_current();
2790 char trattr[TRANS_TRUE_SIZE];
2798 isp = inode->i_security;
2800 mutex_lock(&isp->smk_lock);
2802 * If the inode is already instantiated
2803 * take the quick way out
2805 if (isp->smk_flags & SMK_INODE_INSTANT)
2809 sbsp = sbp->s_security;
2811 * We're going to use the superblock default label
2812 * if there's no label on the file.
2814 final = sbsp->smk_default;
2817 * If this is the root inode the superblock
2818 * may be in the process of initialization.
2819 * If that is the case use the root value out
2820 * of the superblock.
2822 if (opt_dentry->d_parent == opt_dentry) {
2823 if (sbp->s_magic == CGROUP_SUPER_MAGIC) {
2825 * The cgroup filesystem is never mounted,
2826 * so there's no opportunity to set the mount
2829 sbsp->smk_root = smack_known_star.smk_known;
2830 sbsp->smk_default = smack_known_star.smk_known;
2832 isp->smk_inode = sbsp->smk_root;
2833 isp->smk_flags |= SMK_INODE_INSTANT;
2838 * This is pretty hackish.
2839 * Casey says that we shouldn't have to do
2840 * file system specific code, but it does help
2841 * with keeping it simple.
2843 switch (sbp->s_magic) {
2847 case CGROUP_SUPER_MAGIC:
2849 * Casey says that it's a little embarrassing
2850 * that the smack file system doesn't do
2851 * extended attributes.
2853 * Casey says pipes are easy (?)
2855 * Socket access is controlled by the socket
2856 * structures associated with the task involved.
2858 * Cgroupfs is special
2860 final = smack_known_star.smk_known;
2862 case DEVPTS_SUPER_MAGIC:
2864 * devpts seems content with the label of the task.
2865 * Programs that change smack have to treat the
2868 final = ckp->smk_known;
2870 case PROC_SUPER_MAGIC:
2872 * Casey says procfs appears not to care.
2873 * The superblock default suffices.
2878 * Device labels should come from the filesystem,
2879 * but watch out, because they're volitile,
2880 * getting recreated on every reboot.
2882 final = smack_known_star.smk_known;
2886 * If a smack value has been set we want to use it,
2887 * but since tmpfs isn't giving us the opportunity
2888 * to set mount options simulate setting the
2889 * superblock default.
2893 * This isn't an understood special case.
2894 * Get the value from the xattr.
2898 * UNIX domain sockets use lower level socket data.
2900 if (S_ISSOCK(inode->i_mode)) {
2901 final = smack_known_star.smk_known;
2905 * No xattr support means, alas, no SMACK label.
2906 * Use the aforeapplied default.
2907 * It would be curious if the label of the task
2908 * does not match that assigned.
2910 if (inode->i_op->getxattr == NULL)
2913 * Get the dentry for xattr.
2915 dp = dget(opt_dentry);
2916 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2918 final = skp->smk_known;
2921 * Transmuting directory
2923 if (S_ISDIR(inode->i_mode)) {
2925 * If this is a new directory and the label was
2926 * transmuted when the inode was initialized
2927 * set the transmute attribute on the directory
2928 * and mark the inode.
2930 * If there is a transmute attribute on the
2931 * directory mark the inode.
2933 if (isp->smk_flags & SMK_INODE_CHANGED) {
2934 isp->smk_flags &= ~SMK_INODE_CHANGED;
2935 rc = inode->i_op->setxattr(dp,
2936 XATTR_NAME_SMACKTRANSMUTE,
2937 TRANS_TRUE, TRANS_TRUE_SIZE,
2940 rc = inode->i_op->getxattr(dp,
2941 XATTR_NAME_SMACKTRANSMUTE, trattr,
2943 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2944 TRANS_TRUE_SIZE) != 0)
2948 transflag = SMK_INODE_TRANSMUTE;
2951 * Don't let the exec or mmap label be "*" or "@".
2953 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2954 if (skp == &smack_known_star || skp == &smack_known_web)
2956 isp->smk_task = skp;
2957 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2958 if (skp == &smack_known_star || skp == &smack_known_web)
2960 isp->smk_mmap = skp;
2967 isp->smk_inode = ckp->smk_known;
2969 isp->smk_inode = final;
2971 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2974 mutex_unlock(&isp->smk_lock);
2979 * smack_getprocattr - Smack process attribute access
2980 * @p: the object task
2981 * @name: the name of the attribute in /proc/.../attr
2982 * @value: where to put the result
2984 * Places a copy of the task Smack into value
2986 * Returns the length of the smack label or an error code
2988 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2990 struct smack_known *skp = smk_of_task(task_security(p));
2994 if (strcmp(name, "current") != 0)
2997 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3007 * smack_setprocattr - Smack process attribute setting
3008 * @p: the object task
3009 * @name: the name of the attribute in /proc/.../attr
3010 * @value: the value to set
3011 * @size: the size of the value
3013 * Sets the Smack value of the task. Only setting self
3014 * is permitted and only with privilege
3016 * Returns the length of the smack label or an error code
3018 static int smack_setprocattr(struct task_struct *p, char *name,
3019 void *value, size_t size)
3021 struct task_smack *tsp;
3023 struct smack_known *skp;
3026 * Changing another process' Smack value is too dangerous
3027 * and supports no sane use case.
3032 if (!smack_privileged(CAP_MAC_ADMIN))
3035 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3038 if (strcmp(name, "current") != 0)
3041 skp = smk_import_entry(value, size);
3046 * No process is ever allowed the web ("@") label.
3048 if (skp == &smack_known_web)
3051 new = prepare_creds();
3055 tsp = new->security;
3056 tsp->smk_task = skp;
3063 * smack_unix_stream_connect - Smack access on UDS
3065 * @other: the other sock
3068 * Return 0 if a subject with the smack of sock could access
3069 * an object with the smack of other, otherwise an error code
3071 static int smack_unix_stream_connect(struct sock *sock,
3072 struct sock *other, struct sock *newsk)
3074 struct smack_known *skp;
3075 struct smack_known *okp;
3076 struct socket_smack *ssp = sock->sk_security;
3077 struct socket_smack *osp = other->sk_security;
3078 struct socket_smack *nsp = newsk->sk_security;
3079 struct smk_audit_info ad;
3082 struct lsm_network_audit net;
3085 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3089 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3090 smk_ad_setfield_u_net_sk(&ad, other);
3092 rc = smk_access(skp, okp->smk_known, MAY_WRITE, &ad);
3094 rc = smk_access(okp, okp->smk_known, MAY_WRITE, NULL);
3098 * Cross reference the peer labels for SO_PEERSEC.
3101 nsp->smk_packet = ssp->smk_out;
3102 ssp->smk_packet = osp->smk_out;
3109 * smack_unix_may_send - Smack access on UDS
3111 * @other: the other socket
3113 * Return 0 if a subject with the smack of sock could access
3114 * an object with the smack of other, otherwise an error code
3116 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3118 struct socket_smack *ssp = sock->sk->sk_security;
3119 struct socket_smack *osp = other->sk->sk_security;
3120 struct smack_known *skp;
3121 struct smk_audit_info ad;
3124 struct lsm_network_audit net;
3126 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3127 smk_ad_setfield_u_net_sk(&ad, other->sk);
3130 if (smack_privileged(CAP_MAC_OVERRIDE))
3134 return smk_access(skp, osp->smk_in->smk_known, MAY_WRITE, &ad);
3138 * smack_socket_sendmsg - Smack check based on destination host
3141 * @size: the size of the message
3143 * Return 0 if the current subject can write to the destination host.
3144 * For IPv4 this is only a question if the destination is a single label host.
3145 * For IPv6 this is a check against the label of the port.
3147 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3150 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3151 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3155 * Perfectly reasonable for this to be NULL
3160 switch (sip->sin_family) {
3162 rc = smack_netlabel_send(sock->sk, sip);
3165 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3172 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3173 * @sap: netlabel secattr
3174 * @ssp: socket security information
3176 * Returns a pointer to a Smack label entry found on the label list.
3178 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3179 struct socket_smack *ssp)
3181 struct smack_known *skp;
3186 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3188 * Looks like a CIPSO packet.
3189 * If there are flags but no level netlabel isn't
3190 * behaving the way we expect it to.
3192 * Look it up in the label table
3193 * Without guidance regarding the smack value
3194 * for the packet fall back on the network
3198 list_for_each_entry(skp, &smack_known_list, list) {
3199 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3202 * Compare the catsets. Use the netlbl APIs.
3204 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3205 if ((skp->smk_netlabel.flags &
3206 NETLBL_SECATTR_MLS_CAT) == 0)
3210 for (acat = -1, kcat = -1; acat == kcat; ) {
3211 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3213 kcat = netlbl_catmap_walk(
3214 skp->smk_netlabel.attr.mls.cat,
3216 if (acat < 0 || kcat < 0)
3229 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3230 return &smack_known_web;
3231 return &smack_known_star;
3233 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3235 * Looks like a fallback, which gives us a secid.
3237 skp = smack_from_secid(sap->attr.secid);
3239 * This has got to be a bug because it is
3240 * impossible to specify a fallback without
3241 * specifying the label, which will ensure
3242 * it has a secid, and the only way to get a
3243 * secid is from a fallback.
3245 BUG_ON(skp == NULL);
3249 * Without guidance regarding the smack value
3250 * for the packet fall back on the network
3253 return smack_net_ambient;
3256 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3260 int proto = -EINVAL;
3261 struct ipv6hdr _ipv6h;
3262 struct ipv6hdr *ip6;
3264 struct tcphdr _tcph, *th;
3265 struct udphdr _udph, *uh;
3266 struct dccp_hdr _dccph, *dh;
3270 offset = skb_network_offset(skb);
3271 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3274 sip->sin6_addr = ip6->saddr;
3276 nexthdr = ip6->nexthdr;
3277 offset += sizeof(_ipv6h);
3278 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3285 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3287 sip->sin6_port = th->source;
3290 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3292 sip->sin6_port = uh->source;
3295 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3297 sip->sin6_port = dh->dccph_sport;
3304 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3308 * Returns 0 if the packet should be delivered, an error code otherwise
3310 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3312 struct netlbl_lsm_secattr secattr;
3313 struct socket_smack *ssp = sk->sk_security;
3314 struct smack_known *skp;
3315 struct sockaddr_in6 sadd;
3317 struct smk_audit_info ad;
3319 struct lsm_network_audit net;
3321 switch (sk->sk_family) {
3324 * Translate what netlabel gave us.
3326 netlbl_secattr_init(&secattr);
3328 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3330 skp = smack_from_secattr(&secattr, ssp);
3332 skp = smack_net_ambient;
3334 netlbl_secattr_destroy(&secattr);
3337 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3338 ad.a.u.net->family = sk->sk_family;
3339 ad.a.u.net->netif = skb->skb_iif;
3340 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3343 * Receiving a packet requires that the other end
3344 * be able to write here. Read access is not required.
3345 * This is the simplist possible security model
3348 rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad);
3350 netlbl_skbuff_err(skb, rc, 0);
3353 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3354 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3355 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3364 * smack_socket_getpeersec_stream - pull in packet label
3366 * @optval: user's destination
3367 * @optlen: size thereof
3370 * returns zero on success, an error code otherwise
3372 static int smack_socket_getpeersec_stream(struct socket *sock,
3373 char __user *optval,
3374 int __user *optlen, unsigned len)
3376 struct socket_smack *ssp;
3381 ssp = sock->sk->sk_security;
3382 if (ssp->smk_packet != NULL) {
3383 rcp = ssp->smk_packet->smk_known;
3384 slen = strlen(rcp) + 1;
3389 else if (copy_to_user(optval, rcp, slen) != 0)
3392 if (put_user(slen, optlen) != 0)
3400 * smack_socket_getpeersec_dgram - pull in packet label
3401 * @sock: the peer socket
3403 * @secid: pointer to where to put the secid of the packet
3405 * Sets the netlabel socket state on sk from parent
3407 static int smack_socket_getpeersec_dgram(struct socket *sock,
3408 struct sk_buff *skb, u32 *secid)
3411 struct netlbl_lsm_secattr secattr;
3412 struct socket_smack *ssp = NULL;
3413 struct smack_known *skp;
3414 int family = PF_UNSPEC;
3415 u32 s = 0; /* 0 is the invalid secid */
3419 if (skb->protocol == htons(ETH_P_IP))
3421 else if (skb->protocol == htons(ETH_P_IPV6))
3424 if (family == PF_UNSPEC && sock != NULL)
3425 family = sock->sk->sk_family;
3427 if (family == PF_UNIX) {
3428 ssp = sock->sk->sk_security;
3429 s = ssp->smk_out->smk_secid;
3430 } else if (family == PF_INET || family == PF_INET6) {
3432 * Translate what netlabel gave us.
3434 if (sock != NULL && sock->sk != NULL)
3435 ssp = sock->sk->sk_security;
3436 netlbl_secattr_init(&secattr);
3437 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3439 skp = smack_from_secattr(&secattr, ssp);
3442 netlbl_secattr_destroy(&secattr);
3451 * smack_sock_graft - Initialize a newly created socket with an existing sock
3453 * @parent: parent socket
3455 * Set the smk_{in,out} state of an existing sock based on the process that
3456 * is creating the new socket.
3458 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3460 struct socket_smack *ssp;
3461 struct smack_known *skp = smk_of_current();
3464 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3467 ssp = sk->sk_security;
3470 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3474 * smack_inet_conn_request - Smack access check on connect
3475 * @sk: socket involved
3479 * Returns 0 if a task with the packet label could write to
3480 * the socket, otherwise an error code
3482 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3483 struct request_sock *req)
3485 u16 family = sk->sk_family;
3486 struct smack_known *skp;
3487 struct socket_smack *ssp = sk->sk_security;
3488 struct netlbl_lsm_secattr secattr;
3489 struct sockaddr_in addr;
3493 struct smk_audit_info ad;
3495 struct lsm_network_audit net;
3498 if (family == PF_INET6) {
3500 * Handle mapped IPv4 packets arriving
3501 * via IPv6 sockets. Don't set up netlabel
3502 * processing on IPv6.
3504 if (skb->protocol == htons(ETH_P_IP))
3510 netlbl_secattr_init(&secattr);
3511 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3513 skp = smack_from_secattr(&secattr, ssp);
3515 skp = &smack_known_huh;
3516 netlbl_secattr_destroy(&secattr);
3519 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3520 ad.a.u.net->family = family;
3521 ad.a.u.net->netif = skb->skb_iif;
3522 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3525 * Receiving a packet requires that the other end be able to write
3526 * here. Read access is not required.
3528 rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad);
3533 * Save the peer's label in the request_sock so we can later setup
3534 * smk_packet in the child socket so that SO_PEERCRED can report it.
3536 req->peer_secid = skp->smk_secid;
3539 * We need to decide if we want to label the incoming connection here
3540 * if we do we only need to label the request_sock and the stack will
3541 * propagate the wire-label to the sock when it is created.
3544 addr.sin_addr.s_addr = hdr->saddr;
3546 hsp = smack_host_label(&addr);
3550 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3552 netlbl_req_delattr(req);
3558 * smack_inet_csk_clone - Copy the connection information to the new socket
3559 * @sk: the new socket
3560 * @req: the connection's request_sock
3562 * Transfer the connection's peer label to the newly created socket.
3564 static void smack_inet_csk_clone(struct sock *sk,
3565 const struct request_sock *req)
3567 struct socket_smack *ssp = sk->sk_security;
3568 struct smack_known *skp;
3570 if (req->peer_secid != 0) {
3571 skp = smack_from_secid(req->peer_secid);
3572 ssp->smk_packet = skp;
3574 ssp->smk_packet = NULL;
3578 * Key management security hooks
3580 * Casey has not tested key support very heavily.
3581 * The permission check is most likely too restrictive.
3582 * If you care about keys please have a look.
3587 * smack_key_alloc - Set the key security blob
3589 * @cred: the credentials to use
3592 * No allocation required
3596 static int smack_key_alloc(struct key *key, const struct cred *cred,
3597 unsigned long flags)
3599 struct smack_known *skp = smk_of_task(cred->security);
3601 key->security = skp->smk_known;
3606 * smack_key_free - Clear the key security blob
3609 * Clear the blob pointer
3611 static void smack_key_free(struct key *key)
3613 key->security = NULL;
3617 * smack_key_permission - Smack access on a key
3618 * @key_ref: gets to the object
3619 * @cred: the credentials to use
3622 * Return 0 if the task has read and write to the object,
3623 * an error code otherwise
3625 static int smack_key_permission(key_ref_t key_ref,
3626 const struct cred *cred, unsigned perm)
3629 struct smk_audit_info ad;
3630 struct smack_known *tkp = smk_of_task(cred->security);
3633 keyp = key_ref_to_ptr(key_ref);
3637 * If the key hasn't been initialized give it access so that
3640 if (keyp->security == NULL)
3643 * This should not occur
3648 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3649 ad.a.u.key_struct.key = keyp->serial;
3650 ad.a.u.key_struct.key_desc = keyp->description;
3652 if (perm & KEY_NEED_READ)
3654 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
3655 request = MAY_WRITE;
3656 return smk_access(tkp, keyp->security, request, &ad);
3658 #endif /* CONFIG_KEYS */
3663 * Audit requires a unique representation of each Smack specific
3664 * rule. This unique representation is used to distinguish the
3665 * object to be audited from remaining kernel objects and also
3666 * works as a glue between the audit hooks.
3668 * Since repository entries are added but never deleted, we'll use
3669 * the smack_known label address related to the given audit rule as
3670 * the needed unique representation. This also better fits the smack
3671 * model where nearly everything is a label.
3676 * smack_audit_rule_init - Initialize a smack audit rule
3677 * @field: audit rule fields given from user-space (audit.h)
3678 * @op: required testing operator (=, !=, >, <, ...)
3679 * @rulestr: smack label to be audited
3680 * @vrule: pointer to save our own audit rule representation
3682 * Prepare to audit cases where (@field @op @rulestr) is true.
3683 * The label to be audited is created if necessay.
3685 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3687 char **rule = (char **)vrule;
3690 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3693 if (op != Audit_equal && op != Audit_not_equal)
3696 *rule = smk_import(rulestr, 0);
3702 * smack_audit_rule_known - Distinguish Smack audit rules
3703 * @krule: rule of interest, in Audit kernel representation format
3705 * This is used to filter Smack rules from remaining Audit ones.
3706 * If it's proved that this rule belongs to us, the
3707 * audit_rule_match hook will be called to do the final judgement.
3709 static int smack_audit_rule_known(struct audit_krule *krule)
3711 struct audit_field *f;
3714 for (i = 0; i < krule->field_count; i++) {
3715 f = &krule->fields[i];
3717 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3725 * smack_audit_rule_match - Audit given object ?
3726 * @secid: security id for identifying the object to test
3727 * @field: audit rule flags given from user-space
3728 * @op: required testing operator
3729 * @vrule: smack internal rule presentation
3730 * @actx: audit context associated with the check
3732 * The core Audit hook. It's used to take the decision of
3733 * whether to audit or not to audit a given object.
3735 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3736 struct audit_context *actx)
3738 struct smack_known *skp;
3741 if (unlikely(!rule)) {
3742 WARN_ONCE(1, "Smack: missing rule\n");
3746 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3749 skp = smack_from_secid(secid);
3752 * No need to do string comparisons. If a match occurs,
3753 * both pointers will point to the same smack_known
3756 if (op == Audit_equal)
3757 return (rule == skp->smk_known);
3758 if (op == Audit_not_equal)
3759 return (rule != skp->smk_known);
3765 * smack_audit_rule_free - free smack rule representation
3766 * @vrule: rule to be freed.
3768 * No memory was allocated.
3770 static void smack_audit_rule_free(void *vrule)
3775 #endif /* CONFIG_AUDIT */
3778 * smack_ismaclabel - check if xattr @name references a smack MAC label
3779 * @name: Full xattr name to check.
3781 static int smack_ismaclabel(const char *name)
3783 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
3788 * smack_secid_to_secctx - return the smack label for a secid
3789 * @secid: incoming integer
3790 * @secdata: destination
3791 * @seclen: how long it is
3793 * Exists for networking code.
3795 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3797 struct smack_known *skp = smack_from_secid(secid);
3800 *secdata = skp->smk_known;
3801 *seclen = strlen(skp->smk_known);
3806 * smack_secctx_to_secid - return the secid for a smack label
3807 * @secdata: smack label
3808 * @seclen: how long result is
3809 * @secid: outgoing integer
3811 * Exists for audit and networking code.
3813 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3815 *secid = smack_to_secid(secdata);
3820 * smack_release_secctx - don't do anything.
3824 * Exists to make sure nothing gets done, and properly
3826 static void smack_release_secctx(char *secdata, u32 seclen)
3830 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3832 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3835 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3837 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3840 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3843 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3851 struct security_operations smack_ops = {
3854 .ptrace_access_check = smack_ptrace_access_check,
3855 .ptrace_traceme = smack_ptrace_traceme,
3856 .syslog = smack_syslog,
3858 .sb_alloc_security = smack_sb_alloc_security,
3859 .sb_free_security = smack_sb_free_security,
3860 .sb_copy_data = smack_sb_copy_data,
3861 .sb_kern_mount = smack_sb_kern_mount,
3862 .sb_statfs = smack_sb_statfs,
3864 .bprm_set_creds = smack_bprm_set_creds,
3865 .bprm_committing_creds = smack_bprm_committing_creds,
3866 .bprm_secureexec = smack_bprm_secureexec,
3868 .inode_alloc_security = smack_inode_alloc_security,
3869 .inode_free_security = smack_inode_free_security,
3870 .inode_init_security = smack_inode_init_security,
3871 .inode_link = smack_inode_link,
3872 .inode_unlink = smack_inode_unlink,
3873 .inode_rmdir = smack_inode_rmdir,
3874 .inode_rename = smack_inode_rename,
3875 .inode_permission = smack_inode_permission,
3876 .inode_setattr = smack_inode_setattr,
3877 .inode_getattr = smack_inode_getattr,
3878 .inode_setxattr = smack_inode_setxattr,
3879 .inode_post_setxattr = smack_inode_post_setxattr,
3880 .inode_getxattr = smack_inode_getxattr,
3881 .inode_removexattr = smack_inode_removexattr,
3882 .inode_getsecurity = smack_inode_getsecurity,
3883 .inode_setsecurity = smack_inode_setsecurity,
3884 .inode_listsecurity = smack_inode_listsecurity,
3885 .inode_getsecid = smack_inode_getsecid,
3887 .file_permission = smack_file_permission,
3888 .file_alloc_security = smack_file_alloc_security,
3889 .file_free_security = smack_file_free_security,
3890 .file_ioctl = smack_file_ioctl,
3891 .file_lock = smack_file_lock,
3892 .file_fcntl = smack_file_fcntl,
3893 .mmap_file = smack_mmap_file,
3894 .mmap_addr = cap_mmap_addr,
3895 .file_set_fowner = smack_file_set_fowner,
3896 .file_send_sigiotask = smack_file_send_sigiotask,
3897 .file_receive = smack_file_receive,
3899 .file_open = smack_file_open,
3901 .cred_alloc_blank = smack_cred_alloc_blank,
3902 .cred_free = smack_cred_free,
3903 .cred_prepare = smack_cred_prepare,
3904 .cred_transfer = smack_cred_transfer,
3905 .kernel_act_as = smack_kernel_act_as,
3906 .kernel_create_files_as = smack_kernel_create_files_as,
3907 .task_setpgid = smack_task_setpgid,
3908 .task_getpgid = smack_task_getpgid,
3909 .task_getsid = smack_task_getsid,
3910 .task_getsecid = smack_task_getsecid,
3911 .task_setnice = smack_task_setnice,
3912 .task_setioprio = smack_task_setioprio,
3913 .task_getioprio = smack_task_getioprio,
3914 .task_setscheduler = smack_task_setscheduler,
3915 .task_getscheduler = smack_task_getscheduler,
3916 .task_movememory = smack_task_movememory,
3917 .task_kill = smack_task_kill,
3918 .task_wait = smack_task_wait,
3919 .task_to_inode = smack_task_to_inode,
3921 .ipc_permission = smack_ipc_permission,
3922 .ipc_getsecid = smack_ipc_getsecid,
3924 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3925 .msg_msg_free_security = smack_msg_msg_free_security,
3927 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3928 .msg_queue_free_security = smack_msg_queue_free_security,
3929 .msg_queue_associate = smack_msg_queue_associate,
3930 .msg_queue_msgctl = smack_msg_queue_msgctl,
3931 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3932 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3934 .shm_alloc_security = smack_shm_alloc_security,
3935 .shm_free_security = smack_shm_free_security,
3936 .shm_associate = smack_shm_associate,
3937 .shm_shmctl = smack_shm_shmctl,
3938 .shm_shmat = smack_shm_shmat,
3940 .sem_alloc_security = smack_sem_alloc_security,
3941 .sem_free_security = smack_sem_free_security,
3942 .sem_associate = smack_sem_associate,
3943 .sem_semctl = smack_sem_semctl,
3944 .sem_semop = smack_sem_semop,
3946 .d_instantiate = smack_d_instantiate,
3948 .getprocattr = smack_getprocattr,
3949 .setprocattr = smack_setprocattr,
3951 .unix_stream_connect = smack_unix_stream_connect,
3952 .unix_may_send = smack_unix_may_send,
3954 .socket_post_create = smack_socket_post_create,
3955 .socket_bind = smack_socket_bind,
3956 .socket_connect = smack_socket_connect,
3957 .socket_sendmsg = smack_socket_sendmsg,
3958 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3959 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3960 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3961 .sk_alloc_security = smack_sk_alloc_security,
3962 .sk_free_security = smack_sk_free_security,
3963 .sock_graft = smack_sock_graft,
3964 .inet_conn_request = smack_inet_conn_request,
3965 .inet_csk_clone = smack_inet_csk_clone,
3967 /* key management security hooks */
3969 .key_alloc = smack_key_alloc,
3970 .key_free = smack_key_free,
3971 .key_permission = smack_key_permission,
3972 #endif /* CONFIG_KEYS */
3976 .audit_rule_init = smack_audit_rule_init,
3977 .audit_rule_known = smack_audit_rule_known,
3978 .audit_rule_match = smack_audit_rule_match,
3979 .audit_rule_free = smack_audit_rule_free,
3980 #endif /* CONFIG_AUDIT */
3982 .ismaclabel = smack_ismaclabel,
3983 .secid_to_secctx = smack_secid_to_secctx,
3984 .secctx_to_secid = smack_secctx_to_secid,
3985 .release_secctx = smack_release_secctx,
3986 .inode_notifysecctx = smack_inode_notifysecctx,
3987 .inode_setsecctx = smack_inode_setsecctx,
3988 .inode_getsecctx = smack_inode_getsecctx,
3992 static __init void init_smack_known_list(void)
3995 * Initialize rule list locks
3997 mutex_init(&smack_known_huh.smk_rules_lock);
3998 mutex_init(&smack_known_hat.smk_rules_lock);
3999 mutex_init(&smack_known_floor.smk_rules_lock);
4000 mutex_init(&smack_known_star.smk_rules_lock);
4001 mutex_init(&smack_known_invalid.smk_rules_lock);
4002 mutex_init(&smack_known_web.smk_rules_lock);
4004 * Initialize rule lists
4006 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4007 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4008 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4009 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4010 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4011 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4013 * Create the known labels list
4015 smk_insert_entry(&smack_known_huh);
4016 smk_insert_entry(&smack_known_hat);
4017 smk_insert_entry(&smack_known_star);
4018 smk_insert_entry(&smack_known_floor);
4019 smk_insert_entry(&smack_known_invalid);
4020 smk_insert_entry(&smack_known_web);
4024 * smack_init - initialize the smack system
4028 static __init int smack_init(void)
4031 struct task_smack *tsp;
4033 if (!security_module_enable(&smack_ops))
4036 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4041 printk(KERN_INFO "Smack: Initializing.\n");
4044 * Set the security state for the initial task.
4046 cred = (struct cred *) current->cred;
4047 cred->security = tsp;
4049 /* initialize the smack_known_list */
4050 init_smack_known_list();
4055 if (register_security(&smack_ops))
4056 panic("smack: Unable to register with kernel.\n");
4062 * Smack requires early initialization in order to label
4063 * all processes and objects when they are created.
4065 security_initcall(smack_init);