2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
10 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
11 * Paul Moore <paul.moore@hp.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2,
15 * as published by the Free Software Foundation.
18 #include <linux/xattr.h>
19 #include <linux/pagemap.h>
20 #include <linux/mount.h>
21 #include <linux/stat.h>
23 #include <asm/ioctls.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/slab.h>
28 #include <linux/mutex.h>
29 #include <linux/pipe_fs_i.h>
30 #include <net/netlabel.h>
31 #include <net/cipso_ipv4.h>
32 #include <linux/audit.h>
33 #include <linux/magic.h>
36 #define task_security(task) (task_cred_xxx((task), security))
39 * smk_fetch - Fetch the smack label from a file.
40 * @ip: a pointer to the inode
41 * @dp: a pointer to the dentry
43 * Returns a pointer to the master list entry for the Smack label
44 * or NULL if there was no label to fetch.
46 static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
49 char in[SMK_LABELLEN];
51 if (ip->i_op->getxattr == NULL)
54 rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
58 return smk_import(in, rc);
62 * new_inode_smack - allocate an inode security blob
63 * @smack: a pointer to the Smack label to use in the blob
65 * Returns the new blob or NULL if there's no memory available
67 struct inode_smack *new_inode_smack(char *smack)
69 struct inode_smack *isp;
71 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
75 isp->smk_inode = smack;
77 mutex_init(&isp->smk_lock);
88 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
89 * @ctp: child task pointer
90 * @mode: ptrace attachment mode
92 * Returns 0 if access is OK, an error code otherwise
94 * Do the capability checks, and require read and write.
96 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
99 struct smk_audit_info ad;
102 rc = cap_ptrace_access_check(ctp, mode);
106 sp = smk_of_current();
107 tsp = smk_of_task(task_security(ctp));
108 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
109 smk_ad_setfield_u_tsk(&ad, ctp);
111 /* we won't log here, because rc can be overriden */
112 rc = smk_access(sp, tsp, MAY_READWRITE, NULL);
113 if (rc != 0 && capable(CAP_MAC_OVERRIDE))
116 smack_log(sp, tsp, MAY_READWRITE, rc, &ad);
121 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
122 * @ptp: parent task pointer
124 * Returns 0 if access is OK, an error code otherwise
126 * Do the capability checks, and require read and write.
128 static int smack_ptrace_traceme(struct task_struct *ptp)
131 struct smk_audit_info ad;
134 rc = cap_ptrace_traceme(ptp);
138 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
139 smk_ad_setfield_u_tsk(&ad, ptp);
141 sp = smk_of_current();
142 tsp = smk_of_task(task_security(ptp));
143 /* we won't log here, because rc can be overriden */
144 rc = smk_access(tsp, sp, MAY_READWRITE, NULL);
145 if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
148 smack_log(tsp, sp, MAY_READWRITE, rc, &ad);
153 * smack_syslog - Smack approval on syslog
154 * @type: message type
156 * Require that the task has the floor label
158 * Returns 0 on success, error code otherwise.
160 static int smack_syslog(int typefrom_file)
163 char *sp = smk_of_current();
165 if (capable(CAP_MAC_OVERRIDE))
168 if (sp != smack_known_floor.smk_known)
180 * smack_sb_alloc_security - allocate a superblock blob
181 * @sb: the superblock getting the blob
183 * Returns 0 on success or -ENOMEM on error.
185 static int smack_sb_alloc_security(struct super_block *sb)
187 struct superblock_smack *sbsp;
189 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
194 sbsp->smk_root = smack_known_floor.smk_known;
195 sbsp->smk_default = smack_known_floor.smk_known;
196 sbsp->smk_floor = smack_known_floor.smk_known;
197 sbsp->smk_hat = smack_known_hat.smk_known;
198 sbsp->smk_initialized = 0;
199 spin_lock_init(&sbsp->smk_sblock);
201 sb->s_security = sbsp;
207 * smack_sb_free_security - free a superblock blob
208 * @sb: the superblock getting the blob
211 static void smack_sb_free_security(struct super_block *sb)
213 kfree(sb->s_security);
214 sb->s_security = NULL;
218 * smack_sb_copy_data - copy mount options data for processing
219 * @orig: where to start
220 * @smackopts: mount options string
222 * Returns 0 on success or -ENOMEM on error.
224 * Copy the Smack specific mount options out of the mount
227 static int smack_sb_copy_data(char *orig, char *smackopts)
229 char *cp, *commap, *otheropts, *dp;
231 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
232 if (otheropts == NULL)
235 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
236 if (strstr(cp, SMK_FSDEFAULT) == cp)
238 else if (strstr(cp, SMK_FSFLOOR) == cp)
240 else if (strstr(cp, SMK_FSHAT) == cp)
242 else if (strstr(cp, SMK_FSROOT) == cp)
247 commap = strchr(cp, ',');
256 strcpy(orig, otheropts);
257 free_page((unsigned long)otheropts);
263 * smack_sb_kern_mount - Smack specific mount processing
264 * @sb: the file system superblock
265 * @flags: the mount flags
266 * @data: the smack mount options
268 * Returns 0 on success, an error code on failure
270 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
272 struct dentry *root = sb->s_root;
273 struct inode *inode = root->d_inode;
274 struct superblock_smack *sp = sb->s_security;
275 struct inode_smack *isp;
280 spin_lock(&sp->smk_sblock);
281 if (sp->smk_initialized != 0) {
282 spin_unlock(&sp->smk_sblock);
285 sp->smk_initialized = 1;
286 spin_unlock(&sp->smk_sblock);
288 for (op = data; op != NULL; op = commap) {
289 commap = strchr(op, ',');
293 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
294 op += strlen(SMK_FSHAT);
295 nsp = smk_import(op, 0);
298 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
299 op += strlen(SMK_FSFLOOR);
300 nsp = smk_import(op, 0);
303 } else if (strncmp(op, SMK_FSDEFAULT,
304 strlen(SMK_FSDEFAULT)) == 0) {
305 op += strlen(SMK_FSDEFAULT);
306 nsp = smk_import(op, 0);
308 sp->smk_default = nsp;
309 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
310 op += strlen(SMK_FSROOT);
311 nsp = smk_import(op, 0);
318 * Initialize the root inode.
320 isp = inode->i_security;
322 inode->i_security = new_inode_smack(sp->smk_root);
324 isp->smk_inode = sp->smk_root;
330 * smack_sb_statfs - Smack check on statfs
331 * @dentry: identifies the file system in question
333 * Returns 0 if current can read the floor of the filesystem,
334 * and error code otherwise
336 static int smack_sb_statfs(struct dentry *dentry)
338 struct superblock_smack *sbp = dentry->d_sb->s_security;
340 struct smk_audit_info ad;
342 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
343 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
345 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
350 * smack_sb_mount - Smack check for mounting
357 * Returns 0 if current can write the floor of the filesystem
358 * being mounted on, an error code otherwise.
360 static int smack_sb_mount(char *dev_name, struct path *path,
361 char *type, unsigned long flags, void *data)
363 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
364 struct smk_audit_info ad;
366 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
367 smk_ad_setfield_u_fs_path(&ad, *path);
369 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
373 * smack_sb_umount - Smack check for unmounting
374 * @mnt: file system to unmount
377 * Returns 0 if current can write the floor of the filesystem
378 * being unmounted, an error code otherwise.
380 static int smack_sb_umount(struct vfsmount *mnt, int flags)
382 struct superblock_smack *sbp;
383 struct smk_audit_info ad;
385 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
386 smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root);
387 smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
389 sbp = mnt->mnt_sb->s_security;
390 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
397 static int smack_bprm_set_creds(struct linux_binprm *bprm)
399 struct task_smack *tsp = bprm->cred->security;
400 struct inode_smack *isp;
404 rc = cap_bprm_set_creds(bprm);
408 if (bprm->cred_prepared)
411 if (bprm->file == NULL || bprm->file->f_dentry == NULL)
414 dp = bprm->file->f_dentry;
416 if (dp->d_inode == NULL)
419 isp = dp->d_inode->i_security;
421 if (isp->smk_task != NULL)
422 tsp->smk_task = isp->smk_task;
432 * smack_inode_alloc_security - allocate an inode blob
433 * @inode: the inode in need of a blob
435 * Returns 0 if it gets a blob, -ENOMEM otherwise
437 static int smack_inode_alloc_security(struct inode *inode)
439 inode->i_security = new_inode_smack(smk_of_current());
440 if (inode->i_security == NULL)
446 * smack_inode_free_security - free an inode blob
447 * @inode: the inode with a blob
449 * Clears the blob pointer in inode
451 static void smack_inode_free_security(struct inode *inode)
453 kfree(inode->i_security);
454 inode->i_security = NULL;
458 * smack_inode_init_security - copy out the smack from an inode
461 * @name: where to put the attribute name
462 * @value: where to put the attribute value
463 * @len: where to put the length of the attribute
465 * Returns 0 if it all works out, -ENOMEM if there's no memory
467 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
468 char **name, void **value, size_t *len)
470 char *isp = smk_of_inode(inode);
473 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
479 *value = kstrdup(isp, GFP_KERNEL);
485 *len = strlen(isp) + 1;
491 * smack_inode_link - Smack check on link
492 * @old_dentry: the existing object
494 * @new_dentry: the new object
496 * Returns 0 if access is permitted, an error code otherwise
498 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
499 struct dentry *new_dentry)
502 struct smk_audit_info ad;
505 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
506 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
508 isp = smk_of_inode(old_dentry->d_inode);
509 rc = smk_curacc(isp, MAY_WRITE, &ad);
511 if (rc == 0 && new_dentry->d_inode != NULL) {
512 isp = smk_of_inode(new_dentry->d_inode);
513 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
514 rc = smk_curacc(isp, MAY_WRITE, &ad);
521 * smack_inode_unlink - Smack check on inode deletion
522 * @dir: containing directory object
523 * @dentry: file to unlink
525 * Returns 0 if current can write the containing directory
526 * and the object, error code otherwise
528 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
530 struct inode *ip = dentry->d_inode;
531 struct smk_audit_info ad;
534 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
535 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
538 * You need write access to the thing you're unlinking
540 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
543 * You also need write access to the containing directory
545 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
546 smk_ad_setfield_u_fs_inode(&ad, dir);
547 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
553 * smack_inode_rmdir - Smack check on directory deletion
554 * @dir: containing directory object
555 * @dentry: directory to unlink
557 * Returns 0 if current can write the containing directory
558 * and the directory, error code otherwise
560 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
562 struct smk_audit_info ad;
565 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
566 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
569 * You need write access to the thing you're removing
571 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
574 * You also need write access to the containing directory
576 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
577 smk_ad_setfield_u_fs_inode(&ad, dir);
578 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
585 * smack_inode_rename - Smack check on rename
586 * @old_inode: the old directory
587 * @old_dentry: unused
588 * @new_inode: the new directory
589 * @new_dentry: unused
591 * Read and write access is required on both the old and
594 * Returns 0 if access is permitted, an error code otherwise
596 static int smack_inode_rename(struct inode *old_inode,
597 struct dentry *old_dentry,
598 struct inode *new_inode,
599 struct dentry *new_dentry)
603 struct smk_audit_info ad;
605 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
606 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
608 isp = smk_of_inode(old_dentry->d_inode);
609 rc = smk_curacc(isp, MAY_READWRITE, &ad);
611 if (rc == 0 && new_dentry->d_inode != NULL) {
612 isp = smk_of_inode(new_dentry->d_inode);
613 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
614 rc = smk_curacc(isp, MAY_READWRITE, &ad);
620 * smack_inode_permission - Smack version of permission()
621 * @inode: the inode in question
622 * @mask: the access requested
624 * This is the important Smack hook.
626 * Returns 0 if access is permitted, -EACCES otherwise
628 static int smack_inode_permission(struct inode *inode, int mask)
630 struct smk_audit_info ad;
632 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
634 * No permission to check. Existence test. Yup, it's there.
638 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
639 smk_ad_setfield_u_fs_inode(&ad, inode);
640 return smk_curacc(smk_of_inode(inode), mask, &ad);
644 * smack_inode_setattr - Smack check for setting attributes
645 * @dentry: the object
646 * @iattr: for the force flag
648 * Returns 0 if access is permitted, an error code otherwise
650 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
652 struct smk_audit_info ad;
654 * Need to allow for clearing the setuid bit.
656 if (iattr->ia_valid & ATTR_FORCE)
658 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
659 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
661 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
665 * smack_inode_getattr - Smack check for getting attributes
667 * @dentry: the object
669 * Returns 0 if access is permitted, an error code otherwise
671 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
673 struct smk_audit_info ad;
675 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
676 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
677 smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
678 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
682 * smack_inode_setxattr - Smack check for setting xattrs
683 * @dentry: the object
684 * @name: name of the attribute
689 * This protects the Smack attribute explicitly.
691 * Returns 0 if access is permitted, an error code otherwise
693 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
694 const void *value, size_t size, int flags)
696 struct smk_audit_info ad;
699 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
700 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
701 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
702 strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
703 if (!capable(CAP_MAC_ADMIN))
706 * check label validity here so import wont fail on
709 if (size == 0 || size >= SMK_LABELLEN ||
710 smk_import(value, size) == NULL)
713 rc = cap_inode_setxattr(dentry, name, value, size, flags);
715 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
716 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
719 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
725 * smack_inode_post_setxattr - Apply the Smack update approved above
727 * @name: attribute name
728 * @value: attribute value
729 * @size: attribute size
732 * Set the pointer in the inode blob to the entry found
733 * in the master label list.
735 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
736 const void *value, size_t size, int flags)
738 struct inode_smack *isp;
742 * Not SMACK or SMACKEXEC
744 if (strcmp(name, XATTR_NAME_SMACK) &&
745 strcmp(name, XATTR_NAME_SMACKEXEC))
748 isp = dentry->d_inode->i_security;
751 * No locking is done here. This is a pointer
754 nsp = smk_import(value, size);
756 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
758 isp->smk_inode = nsp;
760 isp->smk_inode = smack_known_invalid.smk_known;
765 isp->smk_task = smack_known_invalid.smk_known;
772 * smack_inode_getxattr - Smack check on getxattr
773 * @dentry: the object
776 * Returns 0 if access is permitted, an error code otherwise
778 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
780 struct smk_audit_info ad;
782 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
783 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
785 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
789 * smack_inode_removexattr - Smack check on removexattr
790 * @dentry: the object
791 * @name: name of the attribute
793 * Removing the Smack attribute requires CAP_MAC_ADMIN
795 * Returns 0 if access is permitted, an error code otherwise
797 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
799 struct inode_smack *isp;
800 struct smk_audit_info ad;
803 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
804 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
805 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
806 strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
807 if (!capable(CAP_MAC_ADMIN))
810 rc = cap_inode_removexattr(dentry, name);
812 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
813 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
815 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
818 isp = dentry->d_inode->i_security;
819 isp->smk_task = NULL;
826 * smack_inode_getsecurity - get smack xattrs
828 * @name: attribute name
829 * @buffer: where to put the result
832 * Returns the size of the attribute or an error code
834 static int smack_inode_getsecurity(const struct inode *inode,
835 const char *name, void **buffer,
838 struct socket_smack *ssp;
840 struct super_block *sbp;
841 struct inode *ip = (struct inode *)inode;
846 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
847 isp = smk_of_inode(inode);
848 ilen = strlen(isp) + 1;
854 * The rest of the Smack xattrs are only on sockets.
857 if (sbp->s_magic != SOCKFS_MAGIC)
861 if (sock == NULL || sock->sk == NULL)
864 ssp = sock->sk->sk_security;
866 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
868 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
873 ilen = strlen(isp) + 1;
884 * smack_inode_listsecurity - list the Smack attributes
886 * @buffer: where they go
887 * @buffer_size: size of buffer
889 * Returns 0 on success, -EINVAL otherwise
891 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
894 int len = strlen(XATTR_NAME_SMACK);
896 if (buffer != NULL && len <= buffer_size) {
897 memcpy(buffer, XATTR_NAME_SMACK, len);
904 * smack_inode_getsecid - Extract inode's security id
905 * @inode: inode to extract the info from
906 * @secid: where result will be saved
908 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
910 struct inode_smack *isp = inode->i_security;
912 *secid = smack_to_secid(isp->smk_inode);
920 * smack_file_permission - Smack check on file operations
926 * Should access checks be done on each read or write?
927 * UNICOS and SELinux say yes.
928 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
930 * I'll say no for now. Smack does not do the frequent
931 * label changing that SELinux does.
933 static int smack_file_permission(struct file *file, int mask)
939 * smack_file_alloc_security - assign a file security blob
942 * The security blob for a file is a pointer to the master
943 * label list, so no allocation is done.
947 static int smack_file_alloc_security(struct file *file)
949 file->f_security = smk_of_current();
954 * smack_file_free_security - clear a file security blob
957 * The security blob for a file is a pointer to the master
958 * label list, so no memory is freed.
960 static void smack_file_free_security(struct file *file)
962 file->f_security = NULL;
966 * smack_file_ioctl - Smack check on ioctls
971 * Relies heavily on the correct use of the ioctl command conventions.
973 * Returns 0 if allowed, error code otherwise
975 static int smack_file_ioctl(struct file *file, unsigned int cmd,
979 struct smk_audit_info ad;
981 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
982 smk_ad_setfield_u_fs_path(&ad, file->f_path);
984 if (_IOC_DIR(cmd) & _IOC_WRITE)
985 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
987 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
988 rc = smk_curacc(file->f_security, MAY_READ, &ad);
994 * smack_file_lock - Smack check on file locking
998 * Returns 0 if current has write access, error code otherwise
1000 static int smack_file_lock(struct file *file, unsigned int cmd)
1002 struct smk_audit_info ad;
1004 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
1005 smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry);
1006 return smk_curacc(file->f_security, MAY_WRITE, &ad);
1010 * smack_file_fcntl - Smack check on fcntl
1012 * @cmd: what action to check
1015 * Returns 0 if current has access, error code otherwise
1017 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1020 struct smk_audit_info ad;
1023 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
1024 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1033 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1041 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1044 rc = smk_curacc(file->f_security, MAY_READWRITE, &ad);
1051 * smack_file_set_fowner - set the file security blob value
1052 * @file: object in question
1055 * Further research may be required on this one.
1057 static int smack_file_set_fowner(struct file *file)
1059 file->f_security = smk_of_current();
1064 * smack_file_send_sigiotask - Smack on sigio
1065 * @tsk: The target task
1066 * @fown: the object the signal come from
1069 * Allow a privileged task to get signals even if it shouldn't
1071 * Returns 0 if a subject with the object's smack could
1072 * write to the task, an error code otherwise.
1074 static int smack_file_send_sigiotask(struct task_struct *tsk,
1075 struct fown_struct *fown, int signum)
1079 char *tsp = smk_of_task(tsk->cred->security);
1080 struct smk_audit_info ad;
1083 * struct fown_struct is never outside the context of a struct file
1085 file = container_of(fown, struct file, f_owner);
1086 /* we don't log here as rc can be overriden */
1087 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1088 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1091 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1092 smk_ad_setfield_u_tsk(&ad, tsk);
1093 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1098 * smack_file_receive - Smack file receive check
1101 * Returns 0 if current has access, error code otherwise
1103 static int smack_file_receive(struct file *file)
1106 struct smk_audit_info ad;
1108 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1109 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1111 * This code relies on bitmasks.
1113 if (file->f_mode & FMODE_READ)
1115 if (file->f_mode & FMODE_WRITE)
1118 return smk_curacc(file->f_security, may, &ad);
1126 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1127 * @new: the new credentials
1128 * @gfp: the atomicity of any memory allocations
1130 * Prepare a blank set of credentials for modification. This must allocate all
1131 * the memory the LSM module might require such that cred_transfer() can
1132 * complete without error.
1134 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1136 cred->security = kzalloc(sizeof(struct task_smack), gfp);
1137 if (cred->security == NULL)
1144 * smack_cred_free - "free" task-level security credentials
1145 * @cred: the credentials in question
1147 * Smack isn't using copies of blobs. Everyone
1148 * points to an immutable list. The blobs never go away.
1149 * There is no leak here.
1151 static void smack_cred_free(struct cred *cred)
1153 kfree(cred->security);
1157 * smack_cred_prepare - prepare new set of credentials for modification
1158 * @new: the new credentials
1159 * @old: the original credentials
1160 * @gfp: the atomicity of any memory allocations
1162 * Prepare a new set of credentials for modification.
1164 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1167 struct task_smack *old_tsp = old->security;
1168 struct task_smack *new_tsp;
1170 new_tsp = kzalloc(sizeof(struct task_smack), gfp);
1171 if (new_tsp == NULL)
1174 new_tsp->smk_task = old_tsp->smk_task;
1175 new_tsp->smk_forked = old_tsp->smk_task;
1176 new->security = new_tsp;
1181 * smack_cred_transfer - Transfer the old credentials to the new credentials
1182 * @new: the new credentials
1183 * @old: the original credentials
1185 * Fill in a set of blank credentials from another set of credentials.
1187 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1189 struct task_smack *old_tsp = old->security;
1190 struct task_smack *new_tsp = new->security;
1192 new_tsp->smk_task = old_tsp->smk_task;
1193 new_tsp->smk_forked = old_tsp->smk_task;
1197 * smack_kernel_act_as - Set the subjective context in a set of credentials
1198 * @new: points to the set of credentials to be modified.
1199 * @secid: specifies the security ID to be set
1201 * Set the security data for a kernel service.
1203 static int smack_kernel_act_as(struct cred *new, u32 secid)
1205 struct task_smack *new_tsp = new->security;
1206 char *smack = smack_from_secid(secid);
1211 new_tsp->smk_task = smack;
1216 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1217 * @new: points to the set of credentials to be modified
1218 * @inode: points to the inode to use as a reference
1220 * Set the file creation context in a set of credentials to the same
1221 * as the objective context of the specified inode
1223 static int smack_kernel_create_files_as(struct cred *new,
1224 struct inode *inode)
1226 struct inode_smack *isp = inode->i_security;
1227 struct task_smack *tsp = new->security;
1229 tsp->smk_forked = isp->smk_inode;
1230 tsp->smk_task = isp->smk_inode;
1235 * smk_curacc_on_task - helper to log task related access
1236 * @p: the task object
1237 * @access : the access requested
1239 * Return 0 if access is permitted
1241 static int smk_curacc_on_task(struct task_struct *p, int access)
1243 struct smk_audit_info ad;
1245 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1246 smk_ad_setfield_u_tsk(&ad, p);
1247 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1251 * smack_task_setpgid - Smack check on setting pgid
1252 * @p: the task object
1255 * Return 0 if write access is permitted
1257 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1259 return smk_curacc_on_task(p, MAY_WRITE);
1263 * smack_task_getpgid - Smack access check for getpgid
1264 * @p: the object task
1266 * Returns 0 if current can read the object task, error code otherwise
1268 static int smack_task_getpgid(struct task_struct *p)
1270 return smk_curacc_on_task(p, MAY_READ);
1274 * smack_task_getsid - Smack access check for getsid
1275 * @p: the object task
1277 * Returns 0 if current can read the object task, error code otherwise
1279 static int smack_task_getsid(struct task_struct *p)
1281 return smk_curacc_on_task(p, MAY_READ);
1285 * smack_task_getsecid - get the secid of the task
1286 * @p: the object task
1287 * @secid: where to put the result
1289 * Sets the secid to contain a u32 version of the smack label.
1291 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1293 *secid = smack_to_secid(smk_of_task(task_security(p)));
1297 * smack_task_setnice - Smack check on setting nice
1298 * @p: the task object
1301 * Return 0 if write access is permitted
1303 static int smack_task_setnice(struct task_struct *p, int nice)
1307 rc = cap_task_setnice(p, nice);
1309 rc = smk_curacc_on_task(p, MAY_WRITE);
1314 * smack_task_setioprio - Smack check on setting ioprio
1315 * @p: the task object
1318 * Return 0 if write access is permitted
1320 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1324 rc = cap_task_setioprio(p, ioprio);
1326 rc = smk_curacc_on_task(p, MAY_WRITE);
1331 * smack_task_getioprio - Smack check on reading ioprio
1332 * @p: the task object
1334 * Return 0 if read access is permitted
1336 static int smack_task_getioprio(struct task_struct *p)
1338 return smk_curacc_on_task(p, MAY_READ);
1342 * smack_task_setscheduler - Smack check on setting scheduler
1343 * @p: the task object
1347 * Return 0 if read access is permitted
1349 static int smack_task_setscheduler(struct task_struct *p)
1353 rc = cap_task_setscheduler(p);
1355 rc = smk_curacc_on_task(p, MAY_WRITE);
1360 * smack_task_getscheduler - Smack check on reading scheduler
1361 * @p: the task object
1363 * Return 0 if read access is permitted
1365 static int smack_task_getscheduler(struct task_struct *p)
1367 return smk_curacc_on_task(p, MAY_READ);
1371 * smack_task_movememory - Smack check on moving memory
1372 * @p: the task object
1374 * Return 0 if write access is permitted
1376 static int smack_task_movememory(struct task_struct *p)
1378 return smk_curacc_on_task(p, MAY_WRITE);
1382 * smack_task_kill - Smack check on signal delivery
1383 * @p: the task object
1386 * @secid: identifies the smack to use in lieu of current's
1388 * Return 0 if write access is permitted
1390 * The secid behavior is an artifact of an SELinux hack
1391 * in the USB code. Someday it may go away.
1393 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1396 struct smk_audit_info ad;
1398 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1399 smk_ad_setfield_u_tsk(&ad, p);
1401 * Sending a signal requires that the sender
1402 * can write the receiver.
1405 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1408 * If the secid isn't 0 we're dealing with some USB IO
1409 * specific behavior. This is not clean. For one thing
1410 * we can't take privilege into account.
1412 return smk_access(smack_from_secid(secid),
1413 smk_of_task(task_security(p)), MAY_WRITE, &ad);
1417 * smack_task_wait - Smack access check for waiting
1418 * @p: task to wait for
1420 * Returns 0 if current can wait for p, error code otherwise
1422 static int smack_task_wait(struct task_struct *p)
1424 struct smk_audit_info ad;
1425 char *sp = smk_of_current();
1426 char *tsp = smk_of_forked(task_security(p));
1429 /* we don't log here, we can be overriden */
1430 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
1435 * Allow the operation to succeed if either task
1436 * has privilege to perform operations that might
1437 * account for the smack labels having gotten to
1438 * be different in the first place.
1440 * This breaks the strict subject/object access
1441 * control ideal, taking the object's privilege
1442 * state into account in the decision as well as
1445 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1447 /* we log only if we didn't get overriden */
1449 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1450 smk_ad_setfield_u_tsk(&ad, p);
1451 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
1456 * smack_task_to_inode - copy task smack into the inode blob
1457 * @p: task to copy from
1458 * @inode: inode to copy to
1460 * Sets the smack pointer in the inode security blob
1462 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1464 struct inode_smack *isp = inode->i_security;
1465 isp->smk_inode = smk_of_task(task_security(p));
1473 * smack_sk_alloc_security - Allocate a socket blob
1476 * @gfp_flags: memory allocation flags
1478 * Assign Smack pointers to current
1480 * Returns 0 on success, -ENOMEM is there's no memory
1482 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1484 char *csp = smk_of_current();
1485 struct socket_smack *ssp;
1487 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1493 ssp->smk_packet[0] = '\0';
1495 sk->sk_security = ssp;
1501 * smack_sk_free_security - Free a socket blob
1504 * Clears the blob pointer
1506 static void smack_sk_free_security(struct sock *sk)
1508 kfree(sk->sk_security);
1512 * smack_host_label - check host based restrictions
1513 * @sip: the object end
1515 * looks for host based access restrictions
1517 * This version will only be appropriate for really small sets of single label
1518 * hosts. The caller is responsible for ensuring that the RCU read lock is
1519 * taken before calling this function.
1521 * Returns the label of the far end or NULL if it's not special.
1523 static char *smack_host_label(struct sockaddr_in *sip)
1525 struct smk_netlbladdr *snp;
1526 struct in_addr *siap = &sip->sin_addr;
1528 if (siap->s_addr == 0)
1531 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1533 * we break after finding the first match because
1534 * the list is sorted from longest to shortest mask
1535 * so we have found the most specific match
1537 if ((&snp->smk_host.sin_addr)->s_addr ==
1538 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1539 /* we have found the special CIPSO option */
1540 if (snp->smk_label == smack_cipso_option)
1542 return snp->smk_label;
1549 * smack_set_catset - convert a capset to netlabel mls categories
1550 * @catset: the Smack categories
1551 * @sap: where to put the netlabel categories
1553 * Allocates and fills attr.mls.cat
1555 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1566 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1567 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1568 sap->attr.mls.cat->startbit = 0;
1570 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1571 for (m = 0x80; m != 0; m >>= 1, cat++) {
1574 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1580 * smack_to_secattr - fill a secattr from a smack value
1581 * @smack: the smack value
1582 * @nlsp: where the result goes
1584 * Casey says that CIPSO is good enough for now.
1585 * It can be used to effect.
1586 * It can also be abused to effect when necessary.
1587 * Appologies to the TSIG group in general and GW in particular.
1589 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1591 struct smack_cipso cipso;
1594 nlsp->domain = smack;
1595 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
1597 rc = smack_to_cipso(smack, &cipso);
1599 nlsp->attr.mls.lvl = cipso.smk_level;
1600 smack_set_catset(cipso.smk_catset, nlsp);
1602 nlsp->attr.mls.lvl = smack_cipso_direct;
1603 smack_set_catset(smack, nlsp);
1608 * smack_netlabel - Set the secattr on a socket
1610 * @labeled: socket label scheme
1612 * Convert the outbound smack value (smk_out) to a
1613 * secattr and attach it to the socket.
1615 * Returns 0 on success or an error code
1617 static int smack_netlabel(struct sock *sk, int labeled)
1619 struct socket_smack *ssp = sk->sk_security;
1620 struct netlbl_lsm_secattr secattr;
1624 * Usually the netlabel code will handle changing the
1625 * packet labeling based on the label.
1626 * The case of a single label host is different, because
1627 * a single label host should never get a labeled packet
1628 * even though the label is usually associated with a packet
1632 bh_lock_sock_nested(sk);
1634 if (ssp->smk_out == smack_net_ambient ||
1635 labeled == SMACK_UNLABELED_SOCKET)
1636 netlbl_sock_delattr(sk);
1638 netlbl_secattr_init(&secattr);
1639 smack_to_secattr(ssp->smk_out, &secattr);
1640 rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
1641 netlbl_secattr_destroy(&secattr);
1651 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1653 * @sap: the destination address
1655 * Set the correct secattr for the given socket based on the destination
1656 * address and perform any outbound access checks needed.
1658 * Returns 0 on success or an error code.
1661 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1666 struct socket_smack *ssp = sk->sk_security;
1667 struct smk_audit_info ad;
1670 hostsp = smack_host_label(sap);
1671 if (hostsp != NULL) {
1672 sk_lbl = SMACK_UNLABELED_SOCKET;
1674 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
1675 ad.a.u.net.family = sap->sin_family;
1676 ad.a.u.net.dport = sap->sin_port;
1677 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
1679 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1681 sk_lbl = SMACK_CIPSO_SOCKET;
1688 return smack_netlabel(sk, sk_lbl);
1692 * smack_inode_setsecurity - set smack xattrs
1693 * @inode: the object
1694 * @name: attribute name
1695 * @value: attribute value
1696 * @size: size of the attribute
1699 * Sets the named attribute in the appropriate blob
1701 * Returns 0 on success, or an error code
1703 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1704 const void *value, size_t size, int flags)
1707 struct inode_smack *nsp = inode->i_security;
1708 struct socket_smack *ssp;
1709 struct socket *sock;
1712 if (value == NULL || size > SMK_LABELLEN || size == 0)
1715 sp = smk_import(value, size);
1719 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1720 nsp->smk_inode = sp;
1721 nsp->smk_flags |= SMK_INODE_INSTANT;
1725 * The rest of the Smack xattrs are only on sockets.
1727 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1730 sock = SOCKET_I(inode);
1731 if (sock == NULL || sock->sk == NULL)
1734 ssp = sock->sk->sk_security;
1736 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1738 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1740 if (sock->sk->sk_family != PF_UNIX) {
1741 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1744 "Smack: \"%s\" netlbl error %d.\n",
1754 * smack_socket_post_create - finish socket setup
1756 * @family: protocol family
1761 * Sets the netlabel information on the socket
1763 * Returns 0 on success, and error code otherwise
1765 static int smack_socket_post_create(struct socket *sock, int family,
1766 int type, int protocol, int kern)
1768 if (family != PF_INET || sock->sk == NULL)
1771 * Set the outbound netlbl.
1773 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1777 * smack_socket_connect - connect access check
1779 * @sap: the other end
1780 * @addrlen: size of sap
1782 * Verifies that a connection may be possible
1784 * Returns 0 on success, and error code otherwise
1786 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
1789 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
1791 if (addrlen < sizeof(struct sockaddr_in))
1794 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
1798 * smack_flags_to_may - convert S_ to MAY_ values
1799 * @flags: the S_ value
1801 * Returns the equivalent MAY_ value
1803 static int smack_flags_to_may(int flags)
1807 if (flags & S_IRUGO)
1809 if (flags & S_IWUGO)
1811 if (flags & S_IXUGO)
1818 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1823 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
1825 msg->security = smk_of_current();
1830 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1833 * Clears the blob pointer
1835 static void smack_msg_msg_free_security(struct msg_msg *msg)
1837 msg->security = NULL;
1841 * smack_of_shm - the smack pointer for the shm
1844 * Returns a pointer to the smack value
1846 static char *smack_of_shm(struct shmid_kernel *shp)
1848 return (char *)shp->shm_perm.security;
1852 * smack_shm_alloc_security - Set the security blob for shm
1857 static int smack_shm_alloc_security(struct shmid_kernel *shp)
1859 struct kern_ipc_perm *isp = &shp->shm_perm;
1861 isp->security = smk_of_current();
1866 * smack_shm_free_security - Clear the security blob for shm
1869 * Clears the blob pointer
1871 static void smack_shm_free_security(struct shmid_kernel *shp)
1873 struct kern_ipc_perm *isp = &shp->shm_perm;
1875 isp->security = NULL;
1879 * smk_curacc_shm : check if current has access on shm
1881 * @access : access requested
1883 * Returns 0 if current has the requested access, error code otherwise
1885 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
1887 char *ssp = smack_of_shm(shp);
1888 struct smk_audit_info ad;
1891 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
1892 ad.a.u.ipc_id = shp->shm_perm.id;
1894 return smk_curacc(ssp, access, &ad);
1898 * smack_shm_associate - Smack access check for shm
1900 * @shmflg: access requested
1902 * Returns 0 if current has the requested access, error code otherwise
1904 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
1908 may = smack_flags_to_may(shmflg);
1909 return smk_curacc_shm(shp, may);
1913 * smack_shm_shmctl - Smack access check for shm
1915 * @cmd: what it wants to do
1917 * Returns 0 if current has the requested access, error code otherwise
1919 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
1932 may = MAY_READWRITE;
1937 * System level information.
1943 return smk_curacc_shm(shp, may);
1947 * smack_shm_shmat - Smack access for shmat
1950 * @shmflg: access requested
1952 * Returns 0 if current has the requested access, error code otherwise
1954 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
1959 may = smack_flags_to_may(shmflg);
1960 return smk_curacc_shm(shp, may);
1964 * smack_of_sem - the smack pointer for the sem
1967 * Returns a pointer to the smack value
1969 static char *smack_of_sem(struct sem_array *sma)
1971 return (char *)sma->sem_perm.security;
1975 * smack_sem_alloc_security - Set the security blob for sem
1980 static int smack_sem_alloc_security(struct sem_array *sma)
1982 struct kern_ipc_perm *isp = &sma->sem_perm;
1984 isp->security = smk_of_current();
1989 * smack_sem_free_security - Clear the security blob for sem
1992 * Clears the blob pointer
1994 static void smack_sem_free_security(struct sem_array *sma)
1996 struct kern_ipc_perm *isp = &sma->sem_perm;
1998 isp->security = NULL;
2002 * smk_curacc_sem : check if current has access on sem
2004 * @access : access requested
2006 * Returns 0 if current has the requested access, error code otherwise
2008 static int smk_curacc_sem(struct sem_array *sma, int access)
2010 char *ssp = smack_of_sem(sma);
2011 struct smk_audit_info ad;
2014 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2015 ad.a.u.ipc_id = sma->sem_perm.id;
2017 return smk_curacc(ssp, access, &ad);
2021 * smack_sem_associate - Smack access check for sem
2023 * @semflg: access requested
2025 * Returns 0 if current has the requested access, error code otherwise
2027 static int smack_sem_associate(struct sem_array *sma, int semflg)
2031 may = smack_flags_to_may(semflg);
2032 return smk_curacc_sem(sma, may);
2036 * smack_sem_shmctl - Smack access check for sem
2038 * @cmd: what it wants to do
2040 * Returns 0 if current has the requested access, error code otherwise
2042 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2060 may = MAY_READWRITE;
2065 * System level information
2072 return smk_curacc_sem(sma, may);
2076 * smack_sem_semop - Smack checks of semaphore operations
2082 * Treated as read and write in all cases.
2084 * Returns 0 if access is allowed, error code otherwise
2086 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2087 unsigned nsops, int alter)
2089 return smk_curacc_sem(sma, MAY_READWRITE);
2093 * smack_msg_alloc_security - Set the security blob for msg
2098 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2100 struct kern_ipc_perm *kisp = &msq->q_perm;
2102 kisp->security = smk_of_current();
2107 * smack_msg_free_security - Clear the security blob for msg
2110 * Clears the blob pointer
2112 static void smack_msg_queue_free_security(struct msg_queue *msq)
2114 struct kern_ipc_perm *kisp = &msq->q_perm;
2116 kisp->security = NULL;
2120 * smack_of_msq - the smack pointer for the msq
2123 * Returns a pointer to the smack value
2125 static char *smack_of_msq(struct msg_queue *msq)
2127 return (char *)msq->q_perm.security;
2131 * smk_curacc_msq : helper to check if current has access on msq
2133 * @access : access requested
2135 * return 0 if current has access, error otherwise
2137 static int smk_curacc_msq(struct msg_queue *msq, int access)
2139 char *msp = smack_of_msq(msq);
2140 struct smk_audit_info ad;
2143 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2144 ad.a.u.ipc_id = msq->q_perm.id;
2146 return smk_curacc(msp, access, &ad);
2150 * smack_msg_queue_associate - Smack access check for msg_queue
2152 * @msqflg: access requested
2154 * Returns 0 if current has the requested access, error code otherwise
2156 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2160 may = smack_flags_to_may(msqflg);
2161 return smk_curacc_msq(msq, may);
2165 * smack_msg_queue_msgctl - Smack access check for msg_queue
2167 * @cmd: what it wants to do
2169 * Returns 0 if current has the requested access, error code otherwise
2171 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2182 may = MAY_READWRITE;
2187 * System level information
2194 return smk_curacc_msq(msq, may);
2198 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2201 * @msqflg: access requested
2203 * Returns 0 if current has the requested access, error code otherwise
2205 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2210 may = smack_flags_to_may(msqflg);
2211 return smk_curacc_msq(msq, may);
2215 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2222 * Returns 0 if current has read and write access, error code otherwise
2224 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2225 struct task_struct *target, long type, int mode)
2227 return smk_curacc_msq(msq, MAY_READWRITE);
2231 * smack_ipc_permission - Smack access for ipc_permission()
2232 * @ipp: the object permissions
2233 * @flag: access requested
2235 * Returns 0 if current has read and write access, error code otherwise
2237 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2239 char *isp = ipp->security;
2240 int may = smack_flags_to_may(flag);
2241 struct smk_audit_info ad;
2244 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2245 ad.a.u.ipc_id = ipp->id;
2247 return smk_curacc(isp, may, &ad);
2251 * smack_ipc_getsecid - Extract smack security id
2252 * @ipp: the object permissions
2253 * @secid: where result will be saved
2255 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2257 char *smack = ipp->security;
2259 *secid = smack_to_secid(smack);
2263 * smack_d_instantiate - Make sure the blob is correct on an inode
2264 * @opt_dentry: dentry where inode will be attached
2265 * @inode: the object
2267 * Set the inode's security blob if it hasn't been done already.
2269 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2271 struct super_block *sbp;
2272 struct superblock_smack *sbsp;
2273 struct inode_smack *isp;
2274 char *csp = smk_of_current();
2282 isp = inode->i_security;
2284 mutex_lock(&isp->smk_lock);
2286 * If the inode is already instantiated
2287 * take the quick way out
2289 if (isp->smk_flags & SMK_INODE_INSTANT)
2293 sbsp = sbp->s_security;
2295 * We're going to use the superblock default label
2296 * if there's no label on the file.
2298 final = sbsp->smk_default;
2301 * If this is the root inode the superblock
2302 * may be in the process of initialization.
2303 * If that is the case use the root value out
2304 * of the superblock.
2306 if (opt_dentry->d_parent == opt_dentry) {
2307 isp->smk_inode = sbsp->smk_root;
2308 isp->smk_flags |= SMK_INODE_INSTANT;
2313 * This is pretty hackish.
2314 * Casey says that we shouldn't have to do
2315 * file system specific code, but it does help
2316 * with keeping it simple.
2318 switch (sbp->s_magic) {
2321 * Casey says that it's a little embarassing
2322 * that the smack file system doesn't do
2323 * extended attributes.
2325 final = smack_known_star.smk_known;
2329 * Casey says pipes are easy (?)
2331 final = smack_known_star.smk_known;
2333 case DEVPTS_SUPER_MAGIC:
2335 * devpts seems content with the label of the task.
2336 * Programs that change smack have to treat the
2343 * Socket access is controlled by the socket
2344 * structures associated with the task involved.
2346 final = smack_known_star.smk_known;
2348 case PROC_SUPER_MAGIC:
2350 * Casey says procfs appears not to care.
2351 * The superblock default suffices.
2356 * Device labels should come from the filesystem,
2357 * but watch out, because they're volitile,
2358 * getting recreated on every reboot.
2360 final = smack_known_star.smk_known;
2364 * If a smack value has been set we want to use it,
2365 * but since tmpfs isn't giving us the opportunity
2366 * to set mount options simulate setting the
2367 * superblock default.
2371 * This isn't an understood special case.
2372 * Get the value from the xattr.
2376 * UNIX domain sockets use lower level socket data.
2378 if (S_ISSOCK(inode->i_mode)) {
2379 final = smack_known_star.smk_known;
2383 * No xattr support means, alas, no SMACK label.
2384 * Use the aforeapplied default.
2385 * It would be curious if the label of the task
2386 * does not match that assigned.
2388 if (inode->i_op->getxattr == NULL)
2391 * Get the dentry for xattr.
2393 dp = dget(opt_dentry);
2394 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2395 if (fetched != NULL)
2397 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode,
2405 isp->smk_inode = csp;
2407 isp->smk_inode = final;
2409 isp->smk_flags |= SMK_INODE_INSTANT;
2412 mutex_unlock(&isp->smk_lock);
2417 * smack_getprocattr - Smack process attribute access
2418 * @p: the object task
2419 * @name: the name of the attribute in /proc/.../attr
2420 * @value: where to put the result
2422 * Places a copy of the task Smack into value
2424 * Returns the length of the smack label or an error code
2426 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2431 if (strcmp(name, "current") != 0)
2434 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2444 * smack_setprocattr - Smack process attribute setting
2445 * @p: the object task
2446 * @name: the name of the attribute in /proc/.../attr
2447 * @value: the value to set
2448 * @size: the size of the value
2450 * Sets the Smack value of the task. Only setting self
2451 * is permitted and only with privilege
2453 * Returns the length of the smack label or an error code
2455 static int smack_setprocattr(struct task_struct *p, char *name,
2456 void *value, size_t size)
2458 struct task_smack *tsp;
2463 * Changing another process' Smack value is too dangerous
2464 * and supports no sane use case.
2469 if (!capable(CAP_MAC_ADMIN))
2472 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2475 if (strcmp(name, "current") != 0)
2478 newsmack = smk_import(value, size);
2479 if (newsmack == NULL)
2483 * No process is ever allowed the web ("@") label.
2485 if (newsmack == smack_known_web.smk_known)
2488 new = prepare_creds();
2491 tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
2496 tsp->smk_task = newsmack;
2497 new->security = tsp;
2503 * smack_unix_stream_connect - Smack access on UDS
2505 * @other: the other socket
2508 * Return 0 if a subject with the smack of sock could access
2509 * an object with the smack of other, otherwise an error code
2511 static int smack_unix_stream_connect(struct socket *sock,
2512 struct socket *other, struct sock *newsk)
2514 struct socket_smack *ssp = sock->sk->sk_security;
2515 struct socket_smack *osp = other->sk->sk_security;
2516 struct smk_audit_info ad;
2519 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2520 smk_ad_setfield_u_net_sk(&ad, other->sk);
2522 if (!capable(CAP_MAC_OVERRIDE))
2523 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2529 * smack_unix_may_send - Smack access on UDS
2531 * @other: the other socket
2533 * Return 0 if a subject with the smack of sock could access
2534 * an object with the smack of other, otherwise an error code
2536 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2538 struct socket_smack *ssp = sock->sk->sk_security;
2539 struct socket_smack *osp = other->sk->sk_security;
2540 struct smk_audit_info ad;
2543 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2544 smk_ad_setfield_u_net_sk(&ad, other->sk);
2546 if (!capable(CAP_MAC_OVERRIDE))
2547 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2553 * smack_socket_sendmsg - Smack check based on destination host
2556 * @size: the size of the message
2558 * Return 0 if the current subject can write to the destination
2559 * host. This is only a question if the destination is a single
2562 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2565 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2568 * Perfectly reasonable for this to be NULL
2570 if (sip == NULL || sip->sin_family != AF_INET)
2573 return smack_netlabel_send(sock->sk, sip);
2578 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2579 * @sap: netlabel secattr
2580 * @sip: where to put the result
2582 * Copies a smack label into sip
2584 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2586 char smack[SMK_LABELLEN];
2590 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2592 * Looks like a CIPSO packet.
2593 * If there are flags but no level netlabel isn't
2594 * behaving the way we expect it to.
2596 * Get the categories, if any
2597 * Without guidance regarding the smack value
2598 * for the packet fall back on the network
2601 memset(smack, '\0', SMK_LABELLEN);
2602 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2604 pcat = netlbl_secattr_catmap_walk(
2605 sap->attr.mls.cat, pcat + 1);
2608 smack_catset_bit(pcat, smack);
2611 * If it is CIPSO using smack direct mapping
2612 * we are already done. WeeHee.
2614 if (sap->attr.mls.lvl == smack_cipso_direct) {
2615 memcpy(sip, smack, SMK_MAXLEN);
2619 * Look it up in the supplied table if it is not
2622 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2625 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2627 * Looks like a fallback, which gives us a secid.
2629 sp = smack_from_secid(sap->attr.secid);
2631 * This has got to be a bug because it is
2632 * impossible to specify a fallback without
2633 * specifying the label, which will ensure
2634 * it has a secid, and the only way to get a
2635 * secid is from a fallback.
2638 strncpy(sip, sp, SMK_MAXLEN);
2642 * Without guidance regarding the smack value
2643 * for the packet fall back on the network
2646 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2651 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2655 * Returns 0 if the packet should be delivered, an error code otherwise
2657 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2659 struct netlbl_lsm_secattr secattr;
2660 struct socket_smack *ssp = sk->sk_security;
2661 char smack[SMK_LABELLEN];
2664 struct smk_audit_info ad;
2665 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2669 * Translate what netlabel gave us.
2671 netlbl_secattr_init(&secattr);
2673 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2675 smack_from_secattr(&secattr, smack);
2678 csp = smack_net_ambient;
2680 netlbl_secattr_destroy(&secattr);
2683 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2684 ad.a.u.net.family = sk->sk_family;
2685 ad.a.u.net.netif = skb->skb_iif;
2686 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2689 * Receiving a packet requires that the other end
2690 * be able to write here. Read access is not required.
2691 * This is the simplist possible security model
2694 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2696 netlbl_skbuff_err(skb, rc, 0);
2701 * smack_socket_getpeersec_stream - pull in packet label
2703 * @optval: user's destination
2704 * @optlen: size thereof
2707 * returns zero on success, an error code otherwise
2709 static int smack_socket_getpeersec_stream(struct socket *sock,
2710 char __user *optval,
2711 int __user *optlen, unsigned len)
2713 struct socket_smack *ssp;
2717 ssp = sock->sk->sk_security;
2718 slen = strlen(ssp->smk_packet) + 1;
2722 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2725 if (put_user(slen, optlen) != 0)
2733 * smack_socket_getpeersec_dgram - pull in packet label
2734 * @sock: the peer socket
2736 * @secid: pointer to where to put the secid of the packet
2738 * Sets the netlabel socket state on sk from parent
2740 static int smack_socket_getpeersec_dgram(struct socket *sock,
2741 struct sk_buff *skb, u32 *secid)
2744 struct netlbl_lsm_secattr secattr;
2745 struct socket_smack *sp;
2746 char smack[SMK_LABELLEN];
2747 int family = PF_UNSPEC;
2748 u32 s = 0; /* 0 is the invalid secid */
2752 if (skb->protocol == htons(ETH_P_IP))
2754 else if (skb->protocol == htons(ETH_P_IPV6))
2757 if (family == PF_UNSPEC && sock != NULL)
2758 family = sock->sk->sk_family;
2760 if (family == PF_UNIX) {
2761 sp = sock->sk->sk_security;
2762 s = smack_to_secid(sp->smk_out);
2763 } else if (family == PF_INET || family == PF_INET6) {
2765 * Translate what netlabel gave us.
2767 netlbl_secattr_init(&secattr);
2768 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2770 smack_from_secattr(&secattr, smack);
2771 s = smack_to_secid(smack);
2773 netlbl_secattr_destroy(&secattr);
2782 * smack_sock_graft - Initialize a newly created socket with an existing sock
2784 * @parent: parent socket
2786 * Set the smk_{in,out} state of an existing sock based on the process that
2787 * is creating the new socket.
2789 static void smack_sock_graft(struct sock *sk, struct socket *parent)
2791 struct socket_smack *ssp;
2794 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
2797 ssp = sk->sk_security;
2798 ssp->smk_in = ssp->smk_out = smk_of_current();
2799 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
2803 * smack_inet_conn_request - Smack access check on connect
2804 * @sk: socket involved
2808 * Returns 0 if a task with the packet label could write to
2809 * the socket, otherwise an error code
2811 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
2812 struct request_sock *req)
2814 u16 family = sk->sk_family;
2815 struct socket_smack *ssp = sk->sk_security;
2816 struct netlbl_lsm_secattr secattr;
2817 struct sockaddr_in addr;
2819 char smack[SMK_LABELLEN];
2821 struct smk_audit_info ad;
2823 /* handle mapped IPv4 packets arriving via IPv6 sockets */
2824 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
2827 netlbl_secattr_init(&secattr);
2828 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2830 smack_from_secattr(&secattr, smack);
2832 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
2833 netlbl_secattr_destroy(&secattr);
2836 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2837 ad.a.u.net.family = family;
2838 ad.a.u.net.netif = skb->skb_iif;
2839 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2842 * Receiving a packet requires that the other end be able to write
2843 * here. Read access is not required.
2845 rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad);
2850 * Save the peer's label in the request_sock so we can later setup
2851 * smk_packet in the child socket so that SO_PEERCRED can report it.
2853 req->peer_secid = smack_to_secid(smack);
2856 * We need to decide if we want to label the incoming connection here
2857 * if we do we only need to label the request_sock and the stack will
2858 * propogate the wire-label to the sock when it is created.
2861 addr.sin_addr.s_addr = hdr->saddr;
2863 if (smack_host_label(&addr) == NULL) {
2865 netlbl_secattr_init(&secattr);
2866 smack_to_secattr(smack, &secattr);
2867 rc = netlbl_req_setattr(req, &secattr);
2868 netlbl_secattr_destroy(&secattr);
2871 netlbl_req_delattr(req);
2878 * smack_inet_csk_clone - Copy the connection information to the new socket
2879 * @sk: the new socket
2880 * @req: the connection's request_sock
2882 * Transfer the connection's peer label to the newly created socket.
2884 static void smack_inet_csk_clone(struct sock *sk,
2885 const struct request_sock *req)
2887 struct socket_smack *ssp = sk->sk_security;
2890 if (req->peer_secid != 0) {
2891 smack = smack_from_secid(req->peer_secid);
2892 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
2894 ssp->smk_packet[0] = '\0';
2898 * Key management security hooks
2900 * Casey has not tested key support very heavily.
2901 * The permission check is most likely too restrictive.
2902 * If you care about keys please have a look.
2907 * smack_key_alloc - Set the key security blob
2909 * @cred: the credentials to use
2912 * No allocation required
2916 static int smack_key_alloc(struct key *key, const struct cred *cred,
2917 unsigned long flags)
2919 key->security = smk_of_task(cred->security);
2924 * smack_key_free - Clear the key security blob
2927 * Clear the blob pointer
2929 static void smack_key_free(struct key *key)
2931 key->security = NULL;
2935 * smack_key_permission - Smack access on a key
2936 * @key_ref: gets to the object
2937 * @cred: the credentials to use
2940 * Return 0 if the task has read and write to the object,
2941 * an error code otherwise
2943 static int smack_key_permission(key_ref_t key_ref,
2944 const struct cred *cred, key_perm_t perm)
2947 struct smk_audit_info ad;
2948 char *tsp = smk_of_task(cred->security);
2950 keyp = key_ref_to_ptr(key_ref);
2954 * If the key hasn't been initialized give it access so that
2957 if (keyp->security == NULL)
2960 * This should not occur
2965 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
2966 ad.a.u.key_struct.key = keyp->serial;
2967 ad.a.u.key_struct.key_desc = keyp->description;
2969 return smk_access(tsp, keyp->security,
2970 MAY_READWRITE, &ad);
2972 #endif /* CONFIG_KEYS */
2977 * Audit requires a unique representation of each Smack specific
2978 * rule. This unique representation is used to distinguish the
2979 * object to be audited from remaining kernel objects and also
2980 * works as a glue between the audit hooks.
2982 * Since repository entries are added but never deleted, we'll use
2983 * the smack_known label address related to the given audit rule as
2984 * the needed unique representation. This also better fits the smack
2985 * model where nearly everything is a label.
2990 * smack_audit_rule_init - Initialize a smack audit rule
2991 * @field: audit rule fields given from user-space (audit.h)
2992 * @op: required testing operator (=, !=, >, <, ...)
2993 * @rulestr: smack label to be audited
2994 * @vrule: pointer to save our own audit rule representation
2996 * Prepare to audit cases where (@field @op @rulestr) is true.
2997 * The label to be audited is created if necessay.
2999 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3001 char **rule = (char **)vrule;
3004 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3007 if (op != Audit_equal && op != Audit_not_equal)
3010 *rule = smk_import(rulestr, 0);
3016 * smack_audit_rule_known - Distinguish Smack audit rules
3017 * @krule: rule of interest, in Audit kernel representation format
3019 * This is used to filter Smack rules from remaining Audit ones.
3020 * If it's proved that this rule belongs to us, the
3021 * audit_rule_match hook will be called to do the final judgement.
3023 static int smack_audit_rule_known(struct audit_krule *krule)
3025 struct audit_field *f;
3028 for (i = 0; i < krule->field_count; i++) {
3029 f = &krule->fields[i];
3031 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3039 * smack_audit_rule_match - Audit given object ?
3040 * @secid: security id for identifying the object to test
3041 * @field: audit rule flags given from user-space
3042 * @op: required testing operator
3043 * @vrule: smack internal rule presentation
3044 * @actx: audit context associated with the check
3046 * The core Audit hook. It's used to take the decision of
3047 * whether to audit or not to audit a given object.
3049 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3050 struct audit_context *actx)
3056 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
3057 "Smack: missing rule\n");
3061 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3064 smack = smack_from_secid(secid);
3067 * No need to do string comparisons. If a match occurs,
3068 * both pointers will point to the same smack_known
3071 if (op == Audit_equal)
3072 return (rule == smack);
3073 if (op == Audit_not_equal)
3074 return (rule != smack);
3080 * smack_audit_rule_free - free smack rule representation
3081 * @vrule: rule to be freed.
3083 * No memory was allocated.
3085 static void smack_audit_rule_free(void *vrule)
3090 #endif /* CONFIG_AUDIT */
3093 * smack_secid_to_secctx - return the smack label for a secid
3094 * @secid: incoming integer
3095 * @secdata: destination
3096 * @seclen: how long it is
3098 * Exists for networking code.
3100 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3102 char *sp = smack_from_secid(secid);
3106 *seclen = strlen(sp);
3111 * smack_secctx_to_secid - return the secid for a smack label
3112 * @secdata: smack label
3113 * @seclen: how long result is
3114 * @secid: outgoing integer
3116 * Exists for audit and networking code.
3118 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3120 *secid = smack_to_secid(secdata);
3125 * smack_release_secctx - don't do anything.
3129 * Exists to make sure nothing gets done, and properly
3131 static void smack_release_secctx(char *secdata, u32 seclen)
3135 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3137 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3140 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3142 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3145 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3148 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3156 struct security_operations smack_ops = {
3159 .ptrace_access_check = smack_ptrace_access_check,
3160 .ptrace_traceme = smack_ptrace_traceme,
3161 .syslog = smack_syslog,
3163 .sb_alloc_security = smack_sb_alloc_security,
3164 .sb_free_security = smack_sb_free_security,
3165 .sb_copy_data = smack_sb_copy_data,
3166 .sb_kern_mount = smack_sb_kern_mount,
3167 .sb_statfs = smack_sb_statfs,
3168 .sb_mount = smack_sb_mount,
3169 .sb_umount = smack_sb_umount,
3171 .bprm_set_creds = smack_bprm_set_creds,
3173 .inode_alloc_security = smack_inode_alloc_security,
3174 .inode_free_security = smack_inode_free_security,
3175 .inode_init_security = smack_inode_init_security,
3176 .inode_link = smack_inode_link,
3177 .inode_unlink = smack_inode_unlink,
3178 .inode_rmdir = smack_inode_rmdir,
3179 .inode_rename = smack_inode_rename,
3180 .inode_permission = smack_inode_permission,
3181 .inode_setattr = smack_inode_setattr,
3182 .inode_getattr = smack_inode_getattr,
3183 .inode_setxattr = smack_inode_setxattr,
3184 .inode_post_setxattr = smack_inode_post_setxattr,
3185 .inode_getxattr = smack_inode_getxattr,
3186 .inode_removexattr = smack_inode_removexattr,
3187 .inode_getsecurity = smack_inode_getsecurity,
3188 .inode_setsecurity = smack_inode_setsecurity,
3189 .inode_listsecurity = smack_inode_listsecurity,
3190 .inode_getsecid = smack_inode_getsecid,
3192 .file_permission = smack_file_permission,
3193 .file_alloc_security = smack_file_alloc_security,
3194 .file_free_security = smack_file_free_security,
3195 .file_ioctl = smack_file_ioctl,
3196 .file_lock = smack_file_lock,
3197 .file_fcntl = smack_file_fcntl,
3198 .file_set_fowner = smack_file_set_fowner,
3199 .file_send_sigiotask = smack_file_send_sigiotask,
3200 .file_receive = smack_file_receive,
3202 .cred_alloc_blank = smack_cred_alloc_blank,
3203 .cred_free = smack_cred_free,
3204 .cred_prepare = smack_cred_prepare,
3205 .cred_transfer = smack_cred_transfer,
3206 .kernel_act_as = smack_kernel_act_as,
3207 .kernel_create_files_as = smack_kernel_create_files_as,
3208 .task_setpgid = smack_task_setpgid,
3209 .task_getpgid = smack_task_getpgid,
3210 .task_getsid = smack_task_getsid,
3211 .task_getsecid = smack_task_getsecid,
3212 .task_setnice = smack_task_setnice,
3213 .task_setioprio = smack_task_setioprio,
3214 .task_getioprio = smack_task_getioprio,
3215 .task_setscheduler = smack_task_setscheduler,
3216 .task_getscheduler = smack_task_getscheduler,
3217 .task_movememory = smack_task_movememory,
3218 .task_kill = smack_task_kill,
3219 .task_wait = smack_task_wait,
3220 .task_to_inode = smack_task_to_inode,
3222 .ipc_permission = smack_ipc_permission,
3223 .ipc_getsecid = smack_ipc_getsecid,
3225 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3226 .msg_msg_free_security = smack_msg_msg_free_security,
3228 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3229 .msg_queue_free_security = smack_msg_queue_free_security,
3230 .msg_queue_associate = smack_msg_queue_associate,
3231 .msg_queue_msgctl = smack_msg_queue_msgctl,
3232 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3233 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3235 .shm_alloc_security = smack_shm_alloc_security,
3236 .shm_free_security = smack_shm_free_security,
3237 .shm_associate = smack_shm_associate,
3238 .shm_shmctl = smack_shm_shmctl,
3239 .shm_shmat = smack_shm_shmat,
3241 .sem_alloc_security = smack_sem_alloc_security,
3242 .sem_free_security = smack_sem_free_security,
3243 .sem_associate = smack_sem_associate,
3244 .sem_semctl = smack_sem_semctl,
3245 .sem_semop = smack_sem_semop,
3247 .d_instantiate = smack_d_instantiate,
3249 .getprocattr = smack_getprocattr,
3250 .setprocattr = smack_setprocattr,
3252 .unix_stream_connect = smack_unix_stream_connect,
3253 .unix_may_send = smack_unix_may_send,
3255 .socket_post_create = smack_socket_post_create,
3256 .socket_connect = smack_socket_connect,
3257 .socket_sendmsg = smack_socket_sendmsg,
3258 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3259 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3260 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3261 .sk_alloc_security = smack_sk_alloc_security,
3262 .sk_free_security = smack_sk_free_security,
3263 .sock_graft = smack_sock_graft,
3264 .inet_conn_request = smack_inet_conn_request,
3265 .inet_csk_clone = smack_inet_csk_clone,
3267 /* key management security hooks */
3269 .key_alloc = smack_key_alloc,
3270 .key_free = smack_key_free,
3271 .key_permission = smack_key_permission,
3272 #endif /* CONFIG_KEYS */
3276 .audit_rule_init = smack_audit_rule_init,
3277 .audit_rule_known = smack_audit_rule_known,
3278 .audit_rule_match = smack_audit_rule_match,
3279 .audit_rule_free = smack_audit_rule_free,
3280 #endif /* CONFIG_AUDIT */
3282 .secid_to_secctx = smack_secid_to_secctx,
3283 .secctx_to_secid = smack_secctx_to_secid,
3284 .release_secctx = smack_release_secctx,
3285 .inode_notifysecctx = smack_inode_notifysecctx,
3286 .inode_setsecctx = smack_inode_setsecctx,
3287 .inode_getsecctx = smack_inode_getsecctx,
3291 static __init void init_smack_know_list(void)
3293 list_add(&smack_known_huh.list, &smack_known_list);
3294 list_add(&smack_known_hat.list, &smack_known_list);
3295 list_add(&smack_known_star.list, &smack_known_list);
3296 list_add(&smack_known_floor.list, &smack_known_list);
3297 list_add(&smack_known_invalid.list, &smack_known_list);
3298 list_add(&smack_known_web.list, &smack_known_list);
3302 * smack_init - initialize the smack system
3306 static __init int smack_init(void)
3309 struct task_smack *tsp;
3311 tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
3315 if (!security_module_enable(&smack_ops)) {
3320 printk(KERN_INFO "Smack: Initializing.\n");
3323 * Set the security state for the initial task.
3325 cred = (struct cred *) current->cred;
3326 tsp->smk_forked = smack_known_floor.smk_known;
3327 tsp->smk_task = smack_known_floor.smk_known;
3328 cred->security = tsp;
3330 /* initialize the smack_know_list */
3331 init_smack_know_list();
3335 spin_lock_init(&smack_known_huh.smk_cipsolock);
3336 spin_lock_init(&smack_known_hat.smk_cipsolock);
3337 spin_lock_init(&smack_known_star.smk_cipsolock);
3338 spin_lock_init(&smack_known_floor.smk_cipsolock);
3339 spin_lock_init(&smack_known_invalid.smk_cipsolock);
3344 if (register_security(&smack_ops))
3345 panic("smack: Unable to register with kernel.\n");
3351 * Smack requires early initialization in order to label
3352 * all processes and objects when they are created.
3354 security_initcall(smack_init);