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>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 static LIST_HEAD(smk_ipv6_port_list);
57 static struct kmem_cache *smack_inode_cache;
60 static const match_table_t smk_mount_tokens = {
61 {Opt_fsdefault, SMK_FSDEFAULT "%s"},
62 {Opt_fsfloor, SMK_FSFLOOR "%s"},
63 {Opt_fshat, SMK_FSHAT "%s"},
64 {Opt_fsroot, SMK_FSROOT "%s"},
65 {Opt_fstransmute, SMK_FSTRANS "%s"},
69 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
70 static char *smk_bu_mess[] = {
71 "Bringup Error", /* Unused */
72 "Bringup", /* SMACK_BRINGUP_ALLOW */
73 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
74 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
77 static void smk_bu_mode(int mode, char *s)
87 if (mode & MAY_APPEND)
89 if (mode & MAY_TRANSMUTE)
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
100 static int smk_bu_note(char *note, struct smack_known *sskp,
101 struct smack_known *oskp, int mode, int rc)
103 char acc[SMK_NUM_ACCESS_TYPE + 1];
107 if (rc > SMACK_UNCONFINED_OBJECT)
110 smk_bu_mode(mode, acc);
111 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
112 sskp->smk_known, oskp->smk_known, acc, note);
116 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_current(char *note, struct smack_known *oskp,
123 struct task_smack *tsp = current_security();
124 char acc[SMK_NUM_ACCESS_TYPE + 1];
128 if (rc > SMACK_UNCONFINED_OBJECT)
131 smk_bu_mode(mode, acc);
132 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
133 tsp->smk_task->smk_known, oskp->smk_known,
134 acc, current->comm, note);
138 #define smk_bu_current(note, oskp, mode, RC) (RC)
141 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
142 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
144 struct task_smack *tsp = current_security();
145 struct smack_known *smk_task = smk_of_task_struct(otp);
146 char acc[SMK_NUM_ACCESS_TYPE + 1];
150 if (rc > SMACK_UNCONFINED_OBJECT)
153 smk_bu_mode(mode, acc);
154 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
155 tsp->smk_task->smk_known, smk_task->smk_known, acc,
156 current->comm, otp->comm);
160 #define smk_bu_task(otp, mode, RC) (RC)
163 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
164 static int smk_bu_inode(struct inode *inode, int mode, int rc)
166 struct task_smack *tsp = current_security();
167 struct inode_smack *isp = inode->i_security;
168 char acc[SMK_NUM_ACCESS_TYPE + 1];
170 if (isp->smk_flags & SMK_INODE_IMPURE)
171 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
172 inode->i_sb->s_id, inode->i_ino, current->comm);
176 if (rc > SMACK_UNCONFINED_OBJECT)
178 if (rc == SMACK_UNCONFINED_SUBJECT &&
179 (mode & (MAY_WRITE | MAY_APPEND)))
180 isp->smk_flags |= SMK_INODE_IMPURE;
182 smk_bu_mode(mode, acc);
184 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
185 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
186 inode->i_sb->s_id, inode->i_ino, current->comm);
190 #define smk_bu_inode(inode, mode, RC) (RC)
193 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
194 static int smk_bu_file(struct file *file, int mode, int rc)
196 struct task_smack *tsp = current_security();
197 struct smack_known *sskp = tsp->smk_task;
198 struct inode *inode = file_inode(file);
199 struct inode_smack *isp = inode->i_security;
200 char acc[SMK_NUM_ACCESS_TYPE + 1];
202 if (isp->smk_flags & SMK_INODE_IMPURE)
203 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
204 inode->i_sb->s_id, inode->i_ino, current->comm);
208 if (rc > SMACK_UNCONFINED_OBJECT)
211 smk_bu_mode(mode, acc);
212 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
213 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
214 inode->i_sb->s_id, inode->i_ino, file,
219 #define smk_bu_file(file, mode, RC) (RC)
222 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
223 static int smk_bu_credfile(const struct cred *cred, struct file *file,
226 struct task_smack *tsp = cred->security;
227 struct smack_known *sskp = tsp->smk_task;
228 struct inode *inode = file->f_inode;
229 struct inode_smack *isp = inode->i_security;
230 char acc[SMK_NUM_ACCESS_TYPE + 1];
232 if (isp->smk_flags & SMK_INODE_IMPURE)
233 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
234 inode->i_sb->s_id, inode->i_ino, current->comm);
238 if (rc > SMACK_UNCONFINED_OBJECT)
241 smk_bu_mode(mode, acc);
242 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
243 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
244 inode->i_sb->s_id, inode->i_ino, file,
249 #define smk_bu_credfile(cred, file, mode, RC) (RC)
253 * smk_fetch - Fetch the smack label from a file.
254 * @name: type of the label (attribute)
255 * @ip: a pointer to the inode
256 * @dp: a pointer to the dentry
258 * Returns a pointer to the master list entry for the Smack label,
259 * NULL if there was no label to fetch, or an error code.
261 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
266 struct smack_known *skp = NULL;
268 if (ip->i_op->getxattr == NULL)
269 return ERR_PTR(-EOPNOTSUPP);
271 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
273 return ERR_PTR(-ENOMEM);
275 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
281 skp = smk_import_entry(buffer, rc);
289 * new_inode_smack - allocate an inode security blob
290 * @skp: a pointer to the Smack label entry to use in the blob
292 * Returns the new blob or NULL if there's no memory available
294 static struct inode_smack *new_inode_smack(struct smack_known *skp)
296 struct inode_smack *isp;
298 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
302 isp->smk_inode = skp;
304 mutex_init(&isp->smk_lock);
310 * new_task_smack - allocate a task security blob
311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
315 * Returns the new blob or NULL if there's no memory available
317 static struct task_smack *new_task_smack(struct smack_known *task,
318 struct smack_known *forked, gfp_t gfp)
320 struct task_smack *tsp;
322 tsp = kzalloc(sizeof(struct task_smack), gfp);
326 tsp->smk_task = task;
327 tsp->smk_forked = forked;
328 INIT_LIST_HEAD(&tsp->smk_rules);
329 INIT_LIST_HEAD(&tsp->smk_relabel);
330 mutex_init(&tsp->smk_rules_lock);
336 * smk_copy_rules - copy a rule set
337 * @nhead: new rules header pointer
338 * @ohead: old rules header pointer
339 * @gfp: type of the memory for the allocation
341 * Returns 0 on success, -ENOMEM on error
343 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
346 struct smack_rule *nrp;
347 struct smack_rule *orp;
350 INIT_LIST_HEAD(nhead);
352 list_for_each_entry_rcu(orp, ohead, list) {
353 nrp = kzalloc(sizeof(struct smack_rule), gfp);
359 list_add_rcu(&nrp->list, nhead);
365 * smk_copy_relabel - copy smk_relabel labels list
366 * @nhead: new rules header pointer
367 * @ohead: old rules header pointer
368 * @gfp: type of the memory for the allocation
370 * Returns 0 on success, -ENOMEM on error
372 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
375 struct smack_known_list_elem *nklep;
376 struct smack_known_list_elem *oklep;
378 INIT_LIST_HEAD(nhead);
380 list_for_each_entry(oklep, ohead, list) {
381 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
383 smk_destroy_label_list(nhead);
386 nklep->smk_label = oklep->smk_label;
387 list_add(&nklep->list, nhead);
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode - input mode in form of PTRACE_MODE_*
397 * Returns a converted MAY_* mode usable by smack rules
399 static inline unsigned int smk_ptrace_mode(unsigned int mode)
401 if (mode & PTRACE_MODE_ATTACH)
402 return MAY_READWRITE;
403 if (mode & PTRACE_MODE_READ)
410 * smk_ptrace_rule_check - helper for ptrace access
411 * @tracer: tracer process
412 * @tracee_known: label entry of the process that's about to be traced
413 * @mode: ptrace attachment mode (PTRACE_MODE_*)
414 * @func: name of the function that called us, used for audit
416 * Returns 0 on access granted, -error on error
418 static int smk_ptrace_rule_check(struct task_struct *tracer,
419 struct smack_known *tracee_known,
420 unsigned int mode, const char *func)
423 struct smk_audit_info ad, *saip = NULL;
424 struct task_smack *tsp;
425 struct smack_known *tracer_known;
427 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
428 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
429 smk_ad_setfield_u_tsk(&ad, tracer);
434 tsp = __task_cred(tracer)->security;
435 tracer_known = smk_of_task(tsp);
437 if ((mode & PTRACE_MODE_ATTACH) &&
438 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
439 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
440 if (tracer_known->smk_known == tracee_known->smk_known)
442 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
444 else if (capable(CAP_SYS_PTRACE))
450 smack_log(tracer_known->smk_known,
451 tracee_known->smk_known,
458 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
459 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
467 * We he, that is fun!
471 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
472 * @ctp: child task pointer
473 * @mode: ptrace attachment mode (PTRACE_MODE_*)
475 * Returns 0 if access is OK, an error code otherwise
477 * Do the capability checks.
479 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
481 struct smack_known *skp;
483 skp = smk_of_task_struct(ctp);
485 return smk_ptrace_rule_check(current, skp, mode, __func__);
489 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
490 * @ptp: parent task pointer
492 * Returns 0 if access is OK, an error code otherwise
494 * Do the capability checks, and require PTRACE_MODE_ATTACH.
496 static int smack_ptrace_traceme(struct task_struct *ptp)
499 struct smack_known *skp;
501 skp = smk_of_task(current_security());
503 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
508 * smack_syslog - Smack approval on syslog
509 * @type: message type
511 * Returns 0 on success, error code otherwise.
513 static int smack_syslog(int typefrom_file)
516 struct smack_known *skp = smk_of_current();
518 if (smack_privileged(CAP_MAC_OVERRIDE))
521 if (smack_syslog_label != NULL && smack_syslog_label != skp)
533 * smack_sb_alloc_security - allocate a superblock blob
534 * @sb: the superblock getting the blob
536 * Returns 0 on success or -ENOMEM on error.
538 static int smack_sb_alloc_security(struct super_block *sb)
540 struct superblock_smack *sbsp;
542 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
547 sbsp->smk_root = &smack_known_floor;
548 sbsp->smk_default = &smack_known_floor;
549 sbsp->smk_floor = &smack_known_floor;
550 sbsp->smk_hat = &smack_known_hat;
552 * smk_initialized will be zero from kzalloc.
554 sb->s_security = sbsp;
560 * smack_sb_free_security - free a superblock blob
561 * @sb: the superblock getting the blob
564 static void smack_sb_free_security(struct super_block *sb)
566 kfree(sb->s_security);
567 sb->s_security = NULL;
571 * smack_sb_copy_data - copy mount options data for processing
572 * @orig: where to start
573 * @smackopts: mount options string
575 * Returns 0 on success or -ENOMEM on error.
577 * Copy the Smack specific mount options out of the mount
580 static int smack_sb_copy_data(char *orig, char *smackopts)
582 char *cp, *commap, *otheropts, *dp;
584 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
585 if (otheropts == NULL)
588 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
589 if (strstr(cp, SMK_FSDEFAULT) == cp)
591 else if (strstr(cp, SMK_FSFLOOR) == cp)
593 else if (strstr(cp, SMK_FSHAT) == cp)
595 else if (strstr(cp, SMK_FSROOT) == cp)
597 else if (strstr(cp, SMK_FSTRANS) == cp)
602 commap = strchr(cp, ',');
611 strcpy(orig, otheropts);
612 free_page((unsigned long)otheropts);
618 * smack_parse_opts_str - parse Smack specific mount options
619 * @options: mount options string
620 * @opts: where to store converted mount opts
622 * Returns 0 on success or -ENOMEM on error.
624 * converts Smack specific mount options to generic security option format
626 static int smack_parse_opts_str(char *options,
627 struct security_mnt_opts *opts)
630 char *fsdefault = NULL;
631 char *fsfloor = NULL;
634 char *fstransmute = NULL;
636 int num_mnt_opts = 0;
639 opts->num_mnt_opts = 0;
644 while ((p = strsep(&options, ",")) != NULL) {
645 substring_t args[MAX_OPT_ARGS];
650 token = match_token(p, smk_mount_tokens, args);
656 fsdefault = match_strdup(&args[0]);
663 fsfloor = match_strdup(&args[0]);
670 fshat = match_strdup(&args[0]);
677 fsroot = match_strdup(&args[0]);
681 case Opt_fstransmute:
684 fstransmute = match_strdup(&args[0]);
690 pr_warn("Smack: unknown mount option\n");
695 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
699 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
701 if (!opts->mnt_opts_flags) {
702 kfree(opts->mnt_opts);
707 opts->mnt_opts[num_mnt_opts] = fsdefault;
708 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
711 opts->mnt_opts[num_mnt_opts] = fsfloor;
712 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
715 opts->mnt_opts[num_mnt_opts] = fshat;
716 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
719 opts->mnt_opts[num_mnt_opts] = fsroot;
720 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
723 opts->mnt_opts[num_mnt_opts] = fstransmute;
724 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
727 opts->num_mnt_opts = num_mnt_opts;
732 pr_warn("Smack: duplicate mount options\n");
744 * smack_set_mnt_opts - set Smack specific mount options
745 * @sb: the file system superblock
746 * @opts: Smack mount options
747 * @kern_flags: mount option from kernel space or user space
748 * @set_kern_flags: where to store converted mount opts
750 * Returns 0 on success, an error code on failure
752 * Allow filesystems with binary mount data to explicitly set Smack mount
755 static int smack_set_mnt_opts(struct super_block *sb,
756 struct security_mnt_opts *opts,
757 unsigned long kern_flags,
758 unsigned long *set_kern_flags)
760 struct dentry *root = sb->s_root;
761 struct inode *inode = d_backing_inode(root);
762 struct superblock_smack *sp = sb->s_security;
763 struct inode_smack *isp;
764 struct smack_known *skp;
766 int num_opts = opts->num_mnt_opts;
769 if (sp->smk_initialized)
772 sp->smk_initialized = 1;
774 for (i = 0; i < num_opts; i++) {
775 switch (opts->mnt_opts_flags[i]) {
777 skp = smk_import_entry(opts->mnt_opts[i], 0);
780 sp->smk_default = skp;
783 skp = smk_import_entry(opts->mnt_opts[i], 0);
789 skp = smk_import_entry(opts->mnt_opts[i], 0);
795 skp = smk_import_entry(opts->mnt_opts[i], 0);
801 skp = smk_import_entry(opts->mnt_opts[i], 0);
812 if (!smack_privileged(CAP_MAC_ADMIN)) {
814 * Unprivileged mounts don't get to specify Smack values.
819 * Unprivileged mounts get root and default from the caller.
821 skp = smk_of_current();
823 sp->smk_default = skp;
827 * Initialize the root inode.
829 isp = inode->i_security;
831 isp = new_inode_smack(sp->smk_root);
834 inode->i_security = isp;
836 isp->smk_inode = sp->smk_root;
839 isp->smk_flags |= SMK_INODE_TRANSMUTE;
845 * smack_sb_kern_mount - Smack specific mount processing
846 * @sb: the file system superblock
847 * @flags: the mount flags
848 * @data: the smack mount options
850 * Returns 0 on success, an error code on failure
852 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
855 char *options = data;
856 struct security_mnt_opts opts;
858 security_init_mnt_opts(&opts);
863 rc = smack_parse_opts_str(options, &opts);
868 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
871 security_free_mnt_opts(&opts);
876 * smack_sb_statfs - Smack check on statfs
877 * @dentry: identifies the file system in question
879 * Returns 0 if current can read the floor of the filesystem,
880 * and error code otherwise
882 static int smack_sb_statfs(struct dentry *dentry)
884 struct superblock_smack *sbp = dentry->d_sb->s_security;
886 struct smk_audit_info ad;
888 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
889 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
891 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
892 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
901 * smack_bprm_set_creds - set creds for exec
902 * @bprm: the exec information
904 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
906 static int smack_bprm_set_creds(struct linux_binprm *bprm)
908 struct inode *inode = file_inode(bprm->file);
909 struct task_smack *bsp = bprm->cred->security;
910 struct inode_smack *isp;
913 if (bprm->cred_prepared)
916 isp = inode->i_security;
917 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
920 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
921 struct task_struct *tracer;
925 tracer = ptrace_parent(current);
926 if (likely(tracer != NULL))
927 rc = smk_ptrace_rule_check(tracer,
935 } else if (bprm->unsafe)
938 bsp->smk_task = isp->smk_task;
939 bprm->per_clear |= PER_CLEAR_ON_SETID;
945 * smack_bprm_committing_creds - Prepare to install the new credentials
948 * @bprm: binprm for exec
950 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
952 struct task_smack *bsp = bprm->cred->security;
954 if (bsp->smk_task != bsp->smk_forked)
955 current->pdeath_signal = 0;
959 * smack_bprm_secureexec - Return the decision to use secureexec.
960 * @bprm: binprm for exec
962 * Returns 0 on success.
964 static int smack_bprm_secureexec(struct linux_binprm *bprm)
966 struct task_smack *tsp = current_security();
968 if (tsp->smk_task != tsp->smk_forked)
979 * smack_inode_alloc_security - allocate an inode blob
980 * @inode: the inode in need of a blob
982 * Returns 0 if it gets a blob, -ENOMEM otherwise
984 static int smack_inode_alloc_security(struct inode *inode)
986 struct smack_known *skp = smk_of_current();
988 inode->i_security = new_inode_smack(skp);
989 if (inode->i_security == NULL)
995 * smack_inode_free_security - free an inode blob
996 * @inode: the inode with a blob
998 * Clears the blob pointer in inode
1000 static void smack_inode_free_security(struct inode *inode)
1002 kmem_cache_free(smack_inode_cache, inode->i_security);
1003 inode->i_security = NULL;
1007 * smack_inode_init_security - copy out the smack from an inode
1008 * @inode: the newly created inode
1009 * @dir: containing directory object
1011 * @name: where to put the attribute name
1012 * @value: where to put the attribute value
1013 * @len: where to put the length of the attribute
1015 * Returns 0 if it all works out, -ENOMEM if there's no memory
1017 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1018 const struct qstr *qstr, const char **name,
1019 void **value, size_t *len)
1021 struct inode_smack *issp = inode->i_security;
1022 struct smack_known *skp = smk_of_current();
1023 struct smack_known *isp = smk_of_inode(inode);
1024 struct smack_known *dsp = smk_of_inode(dir);
1028 *name = XATTR_SMACK_SUFFIX;
1032 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1037 * If the access rule allows transmutation and
1038 * the directory requests transmutation then
1039 * by all means transmute.
1040 * Mark the inode as changed.
1042 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1043 smk_inode_transmutable(dir)) {
1045 issp->smk_flags |= SMK_INODE_CHANGED;
1048 *value = kstrdup(isp->smk_known, GFP_NOFS);
1052 *len = strlen(isp->smk_known);
1059 * smack_inode_link - Smack check on link
1060 * @old_dentry: the existing object
1062 * @new_dentry: the new object
1064 * Returns 0 if access is permitted, an error code otherwise
1066 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1067 struct dentry *new_dentry)
1069 struct smack_known *isp;
1070 struct smk_audit_info ad;
1073 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1074 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1076 isp = smk_of_inode(d_backing_inode(old_dentry));
1077 rc = smk_curacc(isp, MAY_WRITE, &ad);
1078 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1080 if (rc == 0 && d_is_positive(new_dentry)) {
1081 isp = smk_of_inode(d_backing_inode(new_dentry));
1082 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1083 rc = smk_curacc(isp, MAY_WRITE, &ad);
1084 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1091 * smack_inode_unlink - Smack check on inode deletion
1092 * @dir: containing directory object
1093 * @dentry: file to unlink
1095 * Returns 0 if current can write the containing directory
1096 * and the object, error code otherwise
1098 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1100 struct inode *ip = d_backing_inode(dentry);
1101 struct smk_audit_info ad;
1104 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1105 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1108 * You need write access to the thing you're unlinking
1110 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1111 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1114 * You also need write access to the containing directory
1116 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1117 smk_ad_setfield_u_fs_inode(&ad, dir);
1118 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1119 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1125 * smack_inode_rmdir - Smack check on directory deletion
1126 * @dir: containing directory object
1127 * @dentry: directory to unlink
1129 * Returns 0 if current can write the containing directory
1130 * and the directory, error code otherwise
1132 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1134 struct smk_audit_info ad;
1137 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1138 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1141 * You need write access to the thing you're removing
1143 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1144 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1147 * You also need write access to the containing directory
1149 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1150 smk_ad_setfield_u_fs_inode(&ad, dir);
1151 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1152 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1159 * smack_inode_rename - Smack check on rename
1160 * @old_inode: unused
1161 * @old_dentry: the old object
1162 * @new_inode: unused
1163 * @new_dentry: the new object
1165 * Read and write access is required on both the old and
1168 * Returns 0 if access is permitted, an error code otherwise
1170 static int smack_inode_rename(struct inode *old_inode,
1171 struct dentry *old_dentry,
1172 struct inode *new_inode,
1173 struct dentry *new_dentry)
1176 struct smack_known *isp;
1177 struct smk_audit_info ad;
1179 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1180 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1182 isp = smk_of_inode(d_backing_inode(old_dentry));
1183 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1184 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1186 if (rc == 0 && d_is_positive(new_dentry)) {
1187 isp = smk_of_inode(d_backing_inode(new_dentry));
1188 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1189 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1190 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1196 * smack_inode_permission - Smack version of permission()
1197 * @inode: the inode in question
1198 * @mask: the access requested
1200 * This is the important Smack hook.
1202 * Returns 0 if access is permitted, -EACCES otherwise
1204 static int smack_inode_permission(struct inode *inode, int mask)
1206 struct smk_audit_info ad;
1207 int no_block = mask & MAY_NOT_BLOCK;
1210 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1212 * No permission to check. Existence test. Yup, it's there.
1217 /* May be droppable after audit */
1220 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1221 smk_ad_setfield_u_fs_inode(&ad, inode);
1222 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1223 rc = smk_bu_inode(inode, mask, rc);
1228 * smack_inode_setattr - Smack check for setting attributes
1229 * @dentry: the object
1230 * @iattr: for the force flag
1232 * Returns 0 if access is permitted, an error code otherwise
1234 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1236 struct smk_audit_info ad;
1240 * Need to allow for clearing the setuid bit.
1242 if (iattr->ia_valid & ATTR_FORCE)
1244 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1245 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1247 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1248 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1253 * smack_inode_getattr - Smack check for getting attributes
1254 * @mnt: vfsmount of the object
1255 * @dentry: the object
1257 * Returns 0 if access is permitted, an error code otherwise
1259 static int smack_inode_getattr(const struct path *path)
1261 struct smk_audit_info ad;
1262 struct inode *inode = d_backing_inode(path->dentry);
1265 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1266 smk_ad_setfield_u_fs_path(&ad, *path);
1267 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1268 rc = smk_bu_inode(inode, MAY_READ, rc);
1273 * smack_inode_setxattr - Smack check for setting xattrs
1274 * @dentry: the object
1275 * @name: name of the attribute
1276 * @value: value of the attribute
1277 * @size: size of the value
1280 * This protects the Smack attribute explicitly.
1282 * Returns 0 if access is permitted, an error code otherwise
1284 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1285 const void *value, size_t size, int flags)
1287 struct smk_audit_info ad;
1288 struct smack_known *skp;
1290 int check_import = 0;
1295 * Check label validity here so import won't fail in post_setxattr
1297 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1298 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1299 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1302 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1303 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1307 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1309 if (size != TRANS_TRUE_SIZE ||
1310 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1313 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1315 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1318 if (rc == 0 && check_import) {
1319 skp = size ? smk_import_entry(value, size) : NULL;
1322 else if (skp == NULL || (check_star &&
1323 (skp == &smack_known_star || skp == &smack_known_web)))
1327 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1328 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1331 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1332 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1339 * smack_inode_post_setxattr - Apply the Smack update approved above
1341 * @name: attribute name
1342 * @value: attribute value
1343 * @size: attribute size
1346 * Set the pointer in the inode blob to the entry found
1347 * in the master label list.
1349 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1350 const void *value, size_t size, int flags)
1352 struct smack_known *skp;
1353 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1355 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1356 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1360 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1361 skp = smk_import_entry(value, size);
1363 isp->smk_inode = skp;
1365 isp->smk_inode = &smack_known_invalid;
1366 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1367 skp = smk_import_entry(value, size);
1369 isp->smk_task = skp;
1371 isp->smk_task = &smack_known_invalid;
1372 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1373 skp = smk_import_entry(value, size);
1375 isp->smk_mmap = skp;
1377 isp->smk_mmap = &smack_known_invalid;
1384 * smack_inode_getxattr - Smack check on getxattr
1385 * @dentry: the object
1388 * Returns 0 if access is permitted, an error code otherwise
1390 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1392 struct smk_audit_info ad;
1395 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1396 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1398 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1399 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1404 * smack_inode_removexattr - Smack check on removexattr
1405 * @dentry: the object
1406 * @name: name of the attribute
1408 * Removing the Smack attribute requires CAP_MAC_ADMIN
1410 * Returns 0 if access is permitted, an error code otherwise
1412 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1414 struct inode_smack *isp;
1415 struct smk_audit_info ad;
1418 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1419 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1420 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1421 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1422 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1423 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1424 if (!smack_privileged(CAP_MAC_ADMIN))
1427 rc = cap_inode_removexattr(dentry, name);
1432 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1433 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1435 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1436 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1440 isp = d_backing_inode(dentry)->i_security;
1442 * Don't do anything special for these.
1443 * XATTR_NAME_SMACKIPIN
1444 * XATTR_NAME_SMACKIPOUT
1446 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1447 struct super_block *sbp = d_backing_inode(dentry)->i_sb;
1448 struct superblock_smack *sbsp = sbp->s_security;
1450 isp->smk_inode = sbsp->smk_default;
1451 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1452 isp->smk_task = NULL;
1453 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1454 isp->smk_mmap = NULL;
1455 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1456 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1462 * smack_inode_getsecurity - get smack xattrs
1463 * @inode: the object
1464 * @name: attribute name
1465 * @buffer: where to put the result
1468 * Returns the size of the attribute or an error code
1470 static int smack_inode_getsecurity(struct inode *inode,
1471 const char *name, void **buffer,
1474 struct socket_smack *ssp;
1475 struct socket *sock;
1476 struct super_block *sbp;
1477 struct inode *ip = (struct inode *)inode;
1478 struct smack_known *isp;
1482 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1483 isp = smk_of_inode(inode);
1484 ilen = strlen(isp->smk_known);
1485 *buffer = isp->smk_known;
1490 * The rest of the Smack xattrs are only on sockets.
1493 if (sbp->s_magic != SOCKFS_MAGIC)
1496 sock = SOCKET_I(ip);
1497 if (sock == NULL || sock->sk == NULL)
1500 ssp = sock->sk->sk_security;
1502 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1504 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1509 ilen = strlen(isp->smk_known);
1511 *buffer = isp->smk_known;
1520 * smack_inode_listsecurity - list the Smack attributes
1521 * @inode: the object
1522 * @buffer: where they go
1523 * @buffer_size: size of buffer
1525 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1528 int len = sizeof(XATTR_NAME_SMACK);
1530 if (buffer != NULL && len <= buffer_size)
1531 memcpy(buffer, XATTR_NAME_SMACK, len);
1537 * smack_inode_getsecid - Extract inode's security id
1538 * @inode: inode to extract the info from
1539 * @secid: where result will be saved
1541 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1543 struct inode_smack *isp = inode->i_security;
1545 *secid = isp->smk_inode->smk_secid;
1553 * There is no smack_file_permission hook
1555 * Should access checks be done on each read or write?
1556 * UNICOS and SELinux say yes.
1557 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1559 * I'll say no for now. Smack does not do the frequent
1560 * label changing that SELinux does.
1564 * smack_file_alloc_security - assign a file security blob
1567 * The security blob for a file is a pointer to the master
1568 * label list, so no allocation is done.
1570 * f_security is the owner security information. It
1571 * isn't used on file access checks, it's for send_sigio.
1575 static int smack_file_alloc_security(struct file *file)
1577 struct smack_known *skp = smk_of_current();
1579 file->f_security = skp;
1584 * smack_file_free_security - clear a file security blob
1587 * The security blob for a file is a pointer to the master
1588 * label list, so no memory is freed.
1590 static void smack_file_free_security(struct file *file)
1592 file->f_security = NULL;
1596 * smack_file_ioctl - Smack check on ioctls
1601 * Relies heavily on the correct use of the ioctl command conventions.
1603 * Returns 0 if allowed, error code otherwise
1605 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1609 struct smk_audit_info ad;
1610 struct inode *inode = file_inode(file);
1612 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1613 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1615 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1616 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1617 rc = smk_bu_file(file, MAY_WRITE, rc);
1620 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1621 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1622 rc = smk_bu_file(file, MAY_READ, rc);
1629 * smack_file_lock - Smack check on file locking
1633 * Returns 0 if current has lock access, error code otherwise
1635 static int smack_file_lock(struct file *file, unsigned int cmd)
1637 struct smk_audit_info ad;
1639 struct inode *inode = file_inode(file);
1641 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1642 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1643 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1644 rc = smk_bu_file(file, MAY_LOCK, rc);
1649 * smack_file_fcntl - Smack check on fcntl
1651 * @cmd: what action to check
1654 * Generally these operations are harmless.
1655 * File locking operations present an obvious mechanism
1656 * for passing information, so they require write access.
1658 * Returns 0 if current has access, error code otherwise
1660 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1663 struct smk_audit_info ad;
1665 struct inode *inode = file_inode(file);
1672 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1673 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1674 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1675 rc = smk_bu_file(file, MAY_LOCK, rc);
1679 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1680 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1681 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1682 rc = smk_bu_file(file, MAY_WRITE, rc);
1693 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1694 * if mapping anonymous memory.
1695 * @file contains the file structure for file to map (may be NULL).
1696 * @reqprot contains the protection requested by the application.
1697 * @prot contains the protection that will be applied by the kernel.
1698 * @flags contains the operational flags.
1699 * Return 0 if permission is granted.
1701 static int smack_mmap_file(struct file *file,
1702 unsigned long reqprot, unsigned long prot,
1703 unsigned long flags)
1705 struct smack_known *skp;
1706 struct smack_known *mkp;
1707 struct smack_rule *srp;
1708 struct task_smack *tsp;
1709 struct smack_known *okp;
1710 struct inode_smack *isp;
1719 isp = file_inode(file)->i_security;
1720 if (isp->smk_mmap == NULL)
1722 mkp = isp->smk_mmap;
1724 tsp = current_security();
1725 skp = smk_of_current();
1730 * For each Smack rule associated with the subject
1731 * label verify that the SMACK64MMAP also has access
1732 * to that rule's object label.
1734 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1735 okp = srp->smk_object;
1737 * Matching labels always allows access.
1739 if (mkp->smk_known == okp->smk_known)
1742 * If there is a matching local rule take
1743 * that into account as well.
1745 may = smk_access_entry(srp->smk_subject->smk_known,
1749 may = srp->smk_access;
1751 may &= srp->smk_access;
1753 * If may is zero the SMACK64MMAP subject can't
1754 * possibly have less access.
1760 * Fetch the global list entry.
1761 * If there isn't one a SMACK64MMAP subject
1762 * can't have as much access as current.
1764 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1766 if (mmay == -ENOENT) {
1771 * If there is a local entry it modifies the
1772 * potential access, too.
1774 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1776 if (tmay != -ENOENT)
1780 * If there is any access available to current that is
1781 * not available to a SMACK64MMAP subject
1784 if ((may | mmay) != mmay) {
1796 * smack_file_set_fowner - set the file security blob value
1797 * @file: object in question
1800 static void smack_file_set_fowner(struct file *file)
1802 file->f_security = smk_of_current();
1806 * smack_file_send_sigiotask - Smack on sigio
1807 * @tsk: The target task
1808 * @fown: the object the signal come from
1811 * Allow a privileged task to get signals even if it shouldn't
1813 * Returns 0 if a subject with the object's smack could
1814 * write to the task, an error code otherwise.
1816 static int smack_file_send_sigiotask(struct task_struct *tsk,
1817 struct fown_struct *fown, int signum)
1819 struct smack_known *skp;
1820 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1823 struct smk_audit_info ad;
1826 * struct fown_struct is never outside the context of a struct file
1828 file = container_of(fown, struct file, f_owner);
1830 /* we don't log here as rc can be overriden */
1831 skp = file->f_security;
1832 rc = smk_access(skp, tkp, MAY_WRITE, NULL);
1833 rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc);
1834 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1837 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1838 smk_ad_setfield_u_tsk(&ad, tsk);
1839 smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad);
1844 * smack_file_receive - Smack file receive check
1847 * Returns 0 if current has access, error code otherwise
1849 static int smack_file_receive(struct file *file)
1853 struct smk_audit_info ad;
1854 struct inode *inode = file_inode(file);
1855 struct socket *sock;
1856 struct task_smack *tsp;
1857 struct socket_smack *ssp;
1859 if (unlikely(IS_PRIVATE(inode)))
1862 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1863 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1865 if (S_ISSOCK(inode->i_mode)) {
1866 sock = SOCKET_I(inode);
1867 ssp = sock->sk->sk_security;
1868 tsp = current_security();
1870 * If the receiving process can't write to the
1871 * passed socket or if the passed socket can't
1872 * write to the receiving process don't accept
1873 * the passed socket.
1875 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1876 rc = smk_bu_file(file, may, rc);
1879 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1880 rc = smk_bu_file(file, may, rc);
1884 * This code relies on bitmasks.
1886 if (file->f_mode & FMODE_READ)
1888 if (file->f_mode & FMODE_WRITE)
1891 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1892 rc = smk_bu_file(file, may, rc);
1897 * smack_file_open - Smack dentry open processing
1899 * @cred: task credential
1901 * Set the security blob in the file structure.
1902 * Allow the open only if the task has read access. There are
1903 * many read operations (e.g. fstat) that you can do with an
1904 * fd even if you have the file open write-only.
1908 static int smack_file_open(struct file *file, const struct cred *cred)
1910 struct task_smack *tsp = cred->security;
1911 struct inode *inode = file_inode(file);
1912 struct smk_audit_info ad;
1915 if (smack_privileged(CAP_MAC_OVERRIDE))
1918 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1919 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1920 rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
1921 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1931 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1932 * @new: the new credentials
1933 * @gfp: the atomicity of any memory allocations
1935 * Prepare a blank set of credentials for modification. This must allocate all
1936 * the memory the LSM module might require such that cred_transfer() can
1937 * complete without error.
1939 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1941 struct task_smack *tsp;
1943 tsp = new_task_smack(NULL, NULL, gfp);
1947 cred->security = tsp;
1954 * smack_cred_free - "free" task-level security credentials
1955 * @cred: the credentials in question
1958 static void smack_cred_free(struct cred *cred)
1960 struct task_smack *tsp = cred->security;
1961 struct smack_rule *rp;
1962 struct list_head *l;
1963 struct list_head *n;
1967 cred->security = NULL;
1969 smk_destroy_label_list(&tsp->smk_relabel);
1971 list_for_each_safe(l, n, &tsp->smk_rules) {
1972 rp = list_entry(l, struct smack_rule, list);
1973 list_del(&rp->list);
1980 * smack_cred_prepare - prepare new set of credentials for modification
1981 * @new: the new credentials
1982 * @old: the original credentials
1983 * @gfp: the atomicity of any memory allocations
1985 * Prepare a new set of credentials for modification.
1987 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1990 struct task_smack *old_tsp = old->security;
1991 struct task_smack *new_tsp;
1994 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1995 if (new_tsp == NULL)
1998 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2002 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2007 new->security = new_tsp;
2012 * smack_cred_transfer - Transfer the old credentials to the new credentials
2013 * @new: the new credentials
2014 * @old: the original credentials
2016 * Fill in a set of blank credentials from another set of credentials.
2018 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2020 struct task_smack *old_tsp = old->security;
2021 struct task_smack *new_tsp = new->security;
2023 new_tsp->smk_task = old_tsp->smk_task;
2024 new_tsp->smk_forked = old_tsp->smk_task;
2025 mutex_init(&new_tsp->smk_rules_lock);
2026 INIT_LIST_HEAD(&new_tsp->smk_rules);
2029 /* cbs copy rule list */
2033 * smack_kernel_act_as - Set the subjective context in a set of credentials
2034 * @new: points to the set of credentials to be modified.
2035 * @secid: specifies the security ID to be set
2037 * Set the security data for a kernel service.
2039 static int smack_kernel_act_as(struct cred *new, u32 secid)
2041 struct task_smack *new_tsp = new->security;
2042 struct smack_known *skp = smack_from_secid(secid);
2047 new_tsp->smk_task = skp;
2052 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2053 * @new: points to the set of credentials to be modified
2054 * @inode: points to the inode to use as a reference
2056 * Set the file creation context in a set of credentials to the same
2057 * as the objective context of the specified inode
2059 static int smack_kernel_create_files_as(struct cred *new,
2060 struct inode *inode)
2062 struct inode_smack *isp = inode->i_security;
2063 struct task_smack *tsp = new->security;
2065 tsp->smk_forked = isp->smk_inode;
2066 tsp->smk_task = tsp->smk_forked;
2071 * smk_curacc_on_task - helper to log task related access
2072 * @p: the task object
2073 * @access: the access requested
2074 * @caller: name of the calling function for audit
2076 * Return 0 if access is permitted
2078 static int smk_curacc_on_task(struct task_struct *p, int access,
2081 struct smk_audit_info ad;
2082 struct smack_known *skp = smk_of_task_struct(p);
2085 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2086 smk_ad_setfield_u_tsk(&ad, p);
2087 rc = smk_curacc(skp, access, &ad);
2088 rc = smk_bu_task(p, access, rc);
2093 * smack_task_setpgid - Smack check on setting pgid
2094 * @p: the task object
2097 * Return 0 if write access is permitted
2099 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2101 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2105 * smack_task_getpgid - Smack access check for getpgid
2106 * @p: the object task
2108 * Returns 0 if current can read the object task, error code otherwise
2110 static int smack_task_getpgid(struct task_struct *p)
2112 return smk_curacc_on_task(p, MAY_READ, __func__);
2116 * smack_task_getsid - Smack access check for getsid
2117 * @p: the object task
2119 * Returns 0 if current can read the object task, error code otherwise
2121 static int smack_task_getsid(struct task_struct *p)
2123 return smk_curacc_on_task(p, MAY_READ, __func__);
2127 * smack_task_getsecid - get the secid of the task
2128 * @p: the object task
2129 * @secid: where to put the result
2131 * Sets the secid to contain a u32 version of the smack label.
2133 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2135 struct smack_known *skp = smk_of_task_struct(p);
2137 *secid = skp->smk_secid;
2141 * smack_task_setnice - Smack check on setting nice
2142 * @p: the task object
2145 * Return 0 if write access is permitted
2147 static int smack_task_setnice(struct task_struct *p, int nice)
2149 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2153 * smack_task_setioprio - Smack check on setting ioprio
2154 * @p: the task object
2157 * Return 0 if write access is permitted
2159 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2161 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2165 * smack_task_getioprio - Smack check on reading ioprio
2166 * @p: the task object
2168 * Return 0 if read access is permitted
2170 static int smack_task_getioprio(struct task_struct *p)
2172 return smk_curacc_on_task(p, MAY_READ, __func__);
2176 * smack_task_setscheduler - Smack check on setting scheduler
2177 * @p: the task object
2181 * Return 0 if read access is permitted
2183 static int smack_task_setscheduler(struct task_struct *p)
2185 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2189 * smack_task_getscheduler - Smack check on reading scheduler
2190 * @p: the task object
2192 * Return 0 if read access is permitted
2194 static int smack_task_getscheduler(struct task_struct *p)
2196 return smk_curacc_on_task(p, MAY_READ, __func__);
2200 * smack_task_movememory - Smack check on moving memory
2201 * @p: the task object
2203 * Return 0 if write access is permitted
2205 static int smack_task_movememory(struct task_struct *p)
2207 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2211 * smack_task_kill - Smack check on signal delivery
2212 * @p: the task object
2215 * @secid: identifies the smack to use in lieu of current's
2217 * Return 0 if write access is permitted
2219 * The secid behavior is an artifact of an SELinux hack
2220 * in the USB code. Someday it may go away.
2222 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2225 struct smk_audit_info ad;
2226 struct smack_known *skp;
2227 struct smack_known *tkp = smk_of_task_struct(p);
2230 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2231 smk_ad_setfield_u_tsk(&ad, p);
2233 * Sending a signal requires that the sender
2234 * can write the receiver.
2237 rc = smk_curacc(tkp, MAY_WRITE, &ad);
2238 rc = smk_bu_task(p, MAY_WRITE, rc);
2242 * If the secid isn't 0 we're dealing with some USB IO
2243 * specific behavior. This is not clean. For one thing
2244 * we can't take privilege into account.
2246 skp = smack_from_secid(secid);
2247 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2248 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
2253 * smack_task_wait - Smack access check for waiting
2254 * @p: task to wait for
2258 static int smack_task_wait(struct task_struct *p)
2261 * Allow the operation to succeed.
2263 * In userless environments (e.g. phones) programs
2264 * get marked with SMACK64EXEC and even if the parent
2265 * and child shouldn't be talking the parent still
2266 * may expect to know when the child exits.
2272 * smack_task_to_inode - copy task smack into the inode blob
2273 * @p: task to copy from
2274 * @inode: inode to copy to
2276 * Sets the smack pointer in the inode security blob
2278 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2280 struct inode_smack *isp = inode->i_security;
2281 struct smack_known *skp = smk_of_task_struct(p);
2283 isp->smk_inode = skp;
2291 * smack_sk_alloc_security - Allocate a socket blob
2294 * @gfp_flags: memory allocation flags
2296 * Assign Smack pointers to current
2298 * Returns 0 on success, -ENOMEM is there's no memory
2300 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2302 struct smack_known *skp = smk_of_current();
2303 struct socket_smack *ssp;
2305 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2311 ssp->smk_packet = NULL;
2313 sk->sk_security = ssp;
2319 * smack_sk_free_security - Free a socket blob
2322 * Clears the blob pointer
2324 static void smack_sk_free_security(struct sock *sk)
2326 kfree(sk->sk_security);
2330 * smack_ipv4host_label - check host based restrictions
2331 * @sip: the object end
2333 * looks for host based access restrictions
2335 * This version will only be appropriate for really small sets of single label
2336 * hosts. The caller is responsible for ensuring that the RCU read lock is
2337 * taken before calling this function.
2339 * Returns the label of the far end or NULL if it's not special.
2341 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2343 struct smk_net4addr *snp;
2344 struct in_addr *siap = &sip->sin_addr;
2346 if (siap->s_addr == 0)
2349 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2351 * we break after finding the first match because
2352 * the list is sorted from longest to shortest mask
2353 * so we have found the most specific match
2355 if (snp->smk_host.s_addr ==
2356 (siap->s_addr & snp->smk_mask.s_addr))
2357 return snp->smk_label;
2362 #if IS_ENABLED(CONFIG_IPV6)
2364 * smk_ipv6_localhost - Check for local ipv6 host address
2367 * Returns boolean true if this is the localhost address
2369 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2371 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2372 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2374 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2375 ntohs(be16p[7]) == 1)
2381 * smack_ipv6host_label - check host based restrictions
2382 * @sip: the object end
2384 * looks for host based access restrictions
2386 * This version will only be appropriate for really small sets of single label
2387 * hosts. The caller is responsible for ensuring that the RCU read lock is
2388 * taken before calling this function.
2390 * Returns the label of the far end or NULL if it's not special.
2392 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2394 struct smk_net6addr *snp;
2395 struct in6_addr *sap = &sip->sin6_addr;
2400 * It's local. Don't look for a host label.
2402 if (smk_ipv6_localhost(sip))
2405 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2407 * we break after finding the first match because
2408 * the list is sorted from longest to shortest mask
2409 * so we have found the most specific match
2411 for (found = 1, i = 0; i < 8; i++) {
2413 * If the label is NULL the entry has
2414 * been renounced. Ignore it.
2416 if (snp->smk_label == NULL)
2418 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2419 snp->smk_host.s6_addr16[i]) {
2425 return snp->smk_label;
2430 #endif /* CONFIG_IPV6 */
2433 * smack_netlabel - Set the secattr on a socket
2435 * @labeled: socket label scheme
2437 * Convert the outbound smack value (smk_out) to a
2438 * secattr and attach it to the socket.
2440 * Returns 0 on success or an error code
2442 static int smack_netlabel(struct sock *sk, int labeled)
2444 struct smack_known *skp;
2445 struct socket_smack *ssp = sk->sk_security;
2449 * Usually the netlabel code will handle changing the
2450 * packet labeling based on the label.
2451 * The case of a single label host is different, because
2452 * a single label host should never get a labeled packet
2453 * even though the label is usually associated with a packet
2457 bh_lock_sock_nested(sk);
2459 if (ssp->smk_out == smack_net_ambient ||
2460 labeled == SMACK_UNLABELED_SOCKET)
2461 netlbl_sock_delattr(sk);
2464 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2474 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2476 * @sap: the destination address
2478 * Set the correct secattr for the given socket based on the destination
2479 * address and perform any outbound access checks needed.
2481 * Returns 0 on success or an error code.
2484 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2486 struct smack_known *skp;
2489 struct smack_known *hkp;
2490 struct socket_smack *ssp = sk->sk_security;
2491 struct smk_audit_info ad;
2494 hkp = smack_ipv4host_label(sap);
2497 struct lsm_network_audit net;
2499 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2500 ad.a.u.net->family = sap->sin_family;
2501 ad.a.u.net->dport = sap->sin_port;
2502 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2504 sk_lbl = SMACK_UNLABELED_SOCKET;
2506 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2507 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2509 sk_lbl = SMACK_CIPSO_SOCKET;
2516 return smack_netlabel(sk, sk_lbl);
2519 #if IS_ENABLED(CONFIG_IPV6)
2521 * smk_ipv6_check - check Smack access
2522 * @subject: subject Smack label
2523 * @object: object Smack label
2525 * @act: the action being taken
2527 * Check an IPv6 access
2529 static int smk_ipv6_check(struct smack_known *subject,
2530 struct smack_known *object,
2531 struct sockaddr_in6 *address, int act)
2534 struct lsm_network_audit net;
2536 struct smk_audit_info ad;
2540 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2541 ad.a.u.net->family = PF_INET6;
2542 ad.a.u.net->dport = ntohs(address->sin6_port);
2543 if (act == SMK_RECEIVING)
2544 ad.a.u.net->v6info.saddr = address->sin6_addr;
2546 ad.a.u.net->v6info.daddr = address->sin6_addr;
2548 rc = smk_access(subject, object, MAY_WRITE, &ad);
2549 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2552 #endif /* CONFIG_IPV6 */
2554 #ifdef SMACK_IPV6_PORT_LABELING
2556 * smk_ipv6_port_label - Smack port access table management
2560 * Create or update the port list entry
2562 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2564 struct sock *sk = sock->sk;
2565 struct sockaddr_in6 *addr6;
2566 struct socket_smack *ssp = sock->sk->sk_security;
2567 struct smk_port_label *spp;
2568 unsigned short port = 0;
2570 if (address == NULL) {
2572 * This operation is changing the Smack information
2573 * on the bound socket. Take the changes to the port
2576 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2577 if (sk != spp->smk_sock)
2579 spp->smk_in = ssp->smk_in;
2580 spp->smk_out = ssp->smk_out;
2584 * A NULL address is only used for updating existing
2585 * bound entries. If there isn't one, it's OK.
2590 addr6 = (struct sockaddr_in6 *)address;
2591 port = ntohs(addr6->sin6_port);
2593 * This is a special case that is safely ignored.
2599 * Look for an existing port list entry.
2600 * This is an indication that a port is getting reused.
2602 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2603 if (spp->smk_port != port)
2605 spp->smk_port = port;
2607 spp->smk_in = ssp->smk_in;
2608 spp->smk_out = ssp->smk_out;
2613 * A new port entry is required.
2615 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2619 spp->smk_port = port;
2621 spp->smk_in = ssp->smk_in;
2622 spp->smk_out = ssp->smk_out;
2624 list_add(&spp->list, &smk_ipv6_port_list);
2629 * smk_ipv6_port_check - check Smack port access
2633 * Create or update the port list entry
2635 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2638 struct smk_port_label *spp;
2639 struct socket_smack *ssp = sk->sk_security;
2640 struct smack_known *skp = NULL;
2641 unsigned short port;
2642 struct smack_known *object;
2644 if (act == SMK_RECEIVING) {
2645 skp = smack_ipv6host_label(address);
2646 object = ssp->smk_in;
2649 object = smack_ipv6host_label(address);
2653 * The other end is a single label host.
2655 if (skp != NULL && object != NULL)
2656 return smk_ipv6_check(skp, object, address, act);
2658 skp = smack_net_ambient;
2660 object = smack_net_ambient;
2663 * It's remote, so port lookup does no good.
2665 if (!smk_ipv6_localhost(address))
2666 return smk_ipv6_check(skp, object, address, act);
2669 * It's local so the send check has to have passed.
2671 if (act == SMK_RECEIVING)
2674 port = ntohs(address->sin6_port);
2675 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2676 if (spp->smk_port != port)
2678 object = spp->smk_in;
2679 if (act == SMK_CONNECTING)
2680 ssp->smk_packet = spp->smk_out;
2684 return smk_ipv6_check(skp, object, address, act);
2686 #endif /* SMACK_IPV6_PORT_LABELING */
2689 * smack_inode_setsecurity - set smack xattrs
2690 * @inode: the object
2691 * @name: attribute name
2692 * @value: attribute value
2693 * @size: size of the attribute
2696 * Sets the named attribute in the appropriate blob
2698 * Returns 0 on success, or an error code
2700 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2701 const void *value, size_t size, int flags)
2703 struct smack_known *skp;
2704 struct inode_smack *nsp = inode->i_security;
2705 struct socket_smack *ssp;
2706 struct socket *sock;
2709 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2712 skp = smk_import_entry(value, size);
2714 return PTR_ERR(skp);
2716 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2717 nsp->smk_inode = skp;
2718 nsp->smk_flags |= SMK_INODE_INSTANT;
2722 * The rest of the Smack xattrs are only on sockets.
2724 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2727 sock = SOCKET_I(inode);
2728 if (sock == NULL || sock->sk == NULL)
2731 ssp = sock->sk->sk_security;
2733 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2735 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2737 if (sock->sk->sk_family == PF_INET) {
2738 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2741 "Smack: \"%s\" netlbl error %d.\n",
2747 #ifdef SMACK_IPV6_PORT_LABELING
2748 if (sock->sk->sk_family == PF_INET6)
2749 smk_ipv6_port_label(sock, NULL);
2756 * smack_socket_post_create - finish socket setup
2758 * @family: protocol family
2763 * Sets the netlabel information on the socket
2765 * Returns 0 on success, and error code otherwise
2767 static int smack_socket_post_create(struct socket *sock, int family,
2768 int type, int protocol, int kern)
2770 struct socket_smack *ssp;
2772 if (sock->sk == NULL)
2776 * Sockets created by kernel threads receive web label.
2778 if (unlikely(current->flags & PF_KTHREAD)) {
2779 ssp = sock->sk->sk_security;
2780 ssp->smk_in = &smack_known_web;
2781 ssp->smk_out = &smack_known_web;
2784 if (family != PF_INET)
2787 * Set the outbound netlbl.
2789 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2792 #ifdef SMACK_IPV6_PORT_LABELING
2794 * smack_socket_bind - record port binding information.
2796 * @address: the port address
2797 * @addrlen: size of the address
2799 * Records the label bound to a port.
2803 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2806 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2807 smk_ipv6_port_label(sock, address);
2810 #endif /* SMACK_IPV6_PORT_LABELING */
2813 * smack_socket_connect - connect access check
2815 * @sap: the other end
2816 * @addrlen: size of sap
2818 * Verifies that a connection may be possible
2820 * Returns 0 on success, and error code otherwise
2822 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2826 #if IS_ENABLED(CONFIG_IPV6)
2827 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2829 #ifdef SMACK_IPV6_SECMARK_LABELING
2830 struct smack_known *rsp;
2831 struct socket_smack *ssp = sock->sk->sk_security;
2834 if (sock->sk == NULL)
2837 switch (sock->sk->sk_family) {
2839 if (addrlen < sizeof(struct sockaddr_in))
2841 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2844 if (addrlen < sizeof(struct sockaddr_in6))
2846 #ifdef SMACK_IPV6_SECMARK_LABELING
2847 rsp = smack_ipv6host_label(sip);
2849 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2852 #ifdef SMACK_IPV6_PORT_LABELING
2853 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2861 * smack_flags_to_may - convert S_ to MAY_ values
2862 * @flags: the S_ value
2864 * Returns the equivalent MAY_ value
2866 static int smack_flags_to_may(int flags)
2870 if (flags & S_IRUGO)
2872 if (flags & S_IWUGO)
2874 if (flags & S_IXUGO)
2881 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2886 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2888 struct smack_known *skp = smk_of_current();
2890 msg->security = skp;
2895 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2898 * Clears the blob pointer
2900 static void smack_msg_msg_free_security(struct msg_msg *msg)
2902 msg->security = NULL;
2906 * smack_of_shm - the smack pointer for the shm
2909 * Returns a pointer to the smack value
2911 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2913 return (struct smack_known *)shp->shm_perm.security;
2917 * smack_shm_alloc_security - Set the security blob for shm
2922 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2924 struct kern_ipc_perm *isp = &shp->shm_perm;
2925 struct smack_known *skp = smk_of_current();
2927 isp->security = skp;
2932 * smack_shm_free_security - Clear the security blob for shm
2935 * Clears the blob pointer
2937 static void smack_shm_free_security(struct shmid_kernel *shp)
2939 struct kern_ipc_perm *isp = &shp->shm_perm;
2941 isp->security = NULL;
2945 * smk_curacc_shm : check if current has access on shm
2947 * @access : access requested
2949 * Returns 0 if current has the requested access, error code otherwise
2951 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2953 struct smack_known *ssp = smack_of_shm(shp);
2954 struct smk_audit_info ad;
2958 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2959 ad.a.u.ipc_id = shp->shm_perm.id;
2961 rc = smk_curacc(ssp, access, &ad);
2962 rc = smk_bu_current("shm", ssp, access, rc);
2967 * smack_shm_associate - Smack access check for shm
2969 * @shmflg: access requested
2971 * Returns 0 if current has the requested access, error code otherwise
2973 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2977 may = smack_flags_to_may(shmflg);
2978 return smk_curacc_shm(shp, may);
2982 * smack_shm_shmctl - Smack access check for shm
2984 * @cmd: what it wants to do
2986 * Returns 0 if current has the requested access, error code otherwise
2988 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3001 may = MAY_READWRITE;
3006 * System level information.
3012 return smk_curacc_shm(shp, may);
3016 * smack_shm_shmat - Smack access for shmat
3019 * @shmflg: access requested
3021 * Returns 0 if current has the requested access, error code otherwise
3023 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3028 may = smack_flags_to_may(shmflg);
3029 return smk_curacc_shm(shp, may);
3033 * smack_of_sem - the smack pointer for the sem
3036 * Returns a pointer to the smack value
3038 static struct smack_known *smack_of_sem(struct sem_array *sma)
3040 return (struct smack_known *)sma->sem_perm.security;
3044 * smack_sem_alloc_security - Set the security blob for sem
3049 static int smack_sem_alloc_security(struct sem_array *sma)
3051 struct kern_ipc_perm *isp = &sma->sem_perm;
3052 struct smack_known *skp = smk_of_current();
3054 isp->security = skp;
3059 * smack_sem_free_security - Clear the security blob for sem
3062 * Clears the blob pointer
3064 static void smack_sem_free_security(struct sem_array *sma)
3066 struct kern_ipc_perm *isp = &sma->sem_perm;
3068 isp->security = NULL;
3072 * smk_curacc_sem : check if current has access on sem
3074 * @access : access requested
3076 * Returns 0 if current has the requested access, error code otherwise
3078 static int smk_curacc_sem(struct sem_array *sma, int access)
3080 struct smack_known *ssp = smack_of_sem(sma);
3081 struct smk_audit_info ad;
3085 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3086 ad.a.u.ipc_id = sma->sem_perm.id;
3088 rc = smk_curacc(ssp, access, &ad);
3089 rc = smk_bu_current("sem", ssp, access, rc);
3094 * smack_sem_associate - Smack access check for sem
3096 * @semflg: access requested
3098 * Returns 0 if current has the requested access, error code otherwise
3100 static int smack_sem_associate(struct sem_array *sma, int semflg)
3104 may = smack_flags_to_may(semflg);
3105 return smk_curacc_sem(sma, may);
3109 * smack_sem_shmctl - Smack access check for sem
3111 * @cmd: what it wants to do
3113 * Returns 0 if current has the requested access, error code otherwise
3115 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3133 may = MAY_READWRITE;
3138 * System level information
3145 return smk_curacc_sem(sma, may);
3149 * smack_sem_semop - Smack checks of semaphore operations
3155 * Treated as read and write in all cases.
3157 * Returns 0 if access is allowed, error code otherwise
3159 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3160 unsigned nsops, int alter)
3162 return smk_curacc_sem(sma, MAY_READWRITE);
3166 * smack_msg_alloc_security - Set the security blob for msg
3171 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3173 struct kern_ipc_perm *kisp = &msq->q_perm;
3174 struct smack_known *skp = smk_of_current();
3176 kisp->security = skp;
3181 * smack_msg_free_security - Clear the security blob for msg
3184 * Clears the blob pointer
3186 static void smack_msg_queue_free_security(struct msg_queue *msq)
3188 struct kern_ipc_perm *kisp = &msq->q_perm;
3190 kisp->security = NULL;
3194 * smack_of_msq - the smack pointer for the msq
3197 * Returns a pointer to the smack label entry
3199 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3201 return (struct smack_known *)msq->q_perm.security;
3205 * smk_curacc_msq : helper to check if current has access on msq
3207 * @access : access requested
3209 * return 0 if current has access, error otherwise
3211 static int smk_curacc_msq(struct msg_queue *msq, int access)
3213 struct smack_known *msp = smack_of_msq(msq);
3214 struct smk_audit_info ad;
3218 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3219 ad.a.u.ipc_id = msq->q_perm.id;
3221 rc = smk_curacc(msp, access, &ad);
3222 rc = smk_bu_current("msq", msp, access, rc);
3227 * smack_msg_queue_associate - Smack access check for msg_queue
3229 * @msqflg: access requested
3231 * Returns 0 if current has the requested access, error code otherwise
3233 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3237 may = smack_flags_to_may(msqflg);
3238 return smk_curacc_msq(msq, may);
3242 * smack_msg_queue_msgctl - Smack access check for msg_queue
3244 * @cmd: what it wants to do
3246 * Returns 0 if current has the requested access, error code otherwise
3248 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3259 may = MAY_READWRITE;
3264 * System level information
3271 return smk_curacc_msq(msq, may);
3275 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3278 * @msqflg: access requested
3280 * Returns 0 if current has the requested access, error code otherwise
3282 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3287 may = smack_flags_to_may(msqflg);
3288 return smk_curacc_msq(msq, may);
3292 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3299 * Returns 0 if current has read and write access, error code otherwise
3301 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3302 struct task_struct *target, long type, int mode)
3304 return smk_curacc_msq(msq, MAY_READWRITE);
3308 * smack_ipc_permission - Smack access for ipc_permission()
3309 * @ipp: the object permissions
3310 * @flag: access requested
3312 * Returns 0 if current has read and write access, error code otherwise
3314 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3316 struct smack_known *iskp = ipp->security;
3317 int may = smack_flags_to_may(flag);
3318 struct smk_audit_info ad;
3322 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3323 ad.a.u.ipc_id = ipp->id;
3325 rc = smk_curacc(iskp, may, &ad);
3326 rc = smk_bu_current("svipc", iskp, may, rc);
3331 * smack_ipc_getsecid - Extract smack security id
3332 * @ipp: the object permissions
3333 * @secid: where result will be saved
3335 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3337 struct smack_known *iskp = ipp->security;
3339 *secid = iskp->smk_secid;
3343 * smack_d_instantiate - Make sure the blob is correct on an inode
3344 * @opt_dentry: dentry where inode will be attached
3345 * @inode: the object
3347 * Set the inode's security blob if it hasn't been done already.
3349 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3351 struct super_block *sbp;
3352 struct superblock_smack *sbsp;
3353 struct inode_smack *isp;
3354 struct smack_known *skp;
3355 struct smack_known *ckp = smk_of_current();
3356 struct smack_known *final;
3357 char trattr[TRANS_TRUE_SIZE];
3365 isp = inode->i_security;
3367 mutex_lock(&isp->smk_lock);
3369 * If the inode is already instantiated
3370 * take the quick way out
3372 if (isp->smk_flags & SMK_INODE_INSTANT)
3376 sbsp = sbp->s_security;
3378 * We're going to use the superblock default label
3379 * if there's no label on the file.
3381 final = sbsp->smk_default;
3384 * If this is the root inode the superblock
3385 * may be in the process of initialization.
3386 * If that is the case use the root value out
3387 * of the superblock.
3389 if (opt_dentry->d_parent == opt_dentry) {
3390 switch (sbp->s_magic) {
3391 case CGROUP_SUPER_MAGIC:
3393 * The cgroup filesystem is never mounted,
3394 * so there's no opportunity to set the mount
3397 sbsp->smk_root = &smack_known_star;
3398 sbsp->smk_default = &smack_known_star;
3399 isp->smk_inode = sbsp->smk_root;
3403 * What about shmem/tmpfs anonymous files with dentry
3404 * obtained from d_alloc_pseudo()?
3406 isp->smk_inode = smk_of_current();
3409 isp->smk_inode = smk_of_current();
3412 isp->smk_inode = sbsp->smk_root;
3415 isp->smk_flags |= SMK_INODE_INSTANT;
3420 * This is pretty hackish.
3421 * Casey says that we shouldn't have to do
3422 * file system specific code, but it does help
3423 * with keeping it simple.
3425 switch (sbp->s_magic) {
3429 case CGROUP_SUPER_MAGIC:
3431 * Casey says that it's a little embarrassing
3432 * that the smack file system doesn't do
3433 * extended attributes.
3435 * Casey says pipes are easy (?)
3437 * Socket access is controlled by the socket
3438 * structures associated with the task involved.
3440 * Cgroupfs is special
3442 final = &smack_known_star;
3444 case DEVPTS_SUPER_MAGIC:
3446 * devpts seems content with the label of the task.
3447 * Programs that change smack have to treat the
3452 case PROC_SUPER_MAGIC:
3454 * Casey says procfs appears not to care.
3455 * The superblock default suffices.
3460 * Device labels should come from the filesystem,
3461 * but watch out, because they're volitile,
3462 * getting recreated on every reboot.
3464 final = &smack_known_star;
3468 * If a smack value has been set we want to use it,
3469 * but since tmpfs isn't giving us the opportunity
3470 * to set mount options simulate setting the
3471 * superblock default.
3475 * This isn't an understood special case.
3476 * Get the value from the xattr.
3480 * UNIX domain sockets use lower level socket data.
3482 if (S_ISSOCK(inode->i_mode)) {
3483 final = &smack_known_star;
3487 * No xattr support means, alas, no SMACK label.
3488 * Use the aforeapplied default.
3489 * It would be curious if the label of the task
3490 * does not match that assigned.
3492 if (inode->i_op->getxattr == NULL)
3495 * Get the dentry for xattr.
3497 dp = dget(opt_dentry);
3498 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3499 if (!IS_ERR_OR_NULL(skp))
3503 * Transmuting directory
3505 if (S_ISDIR(inode->i_mode)) {
3507 * If this is a new directory and the label was
3508 * transmuted when the inode was initialized
3509 * set the transmute attribute on the directory
3510 * and mark the inode.
3512 * If there is a transmute attribute on the
3513 * directory mark the inode.
3515 if (isp->smk_flags & SMK_INODE_CHANGED) {
3516 isp->smk_flags &= ~SMK_INODE_CHANGED;
3517 rc = inode->i_op->setxattr(dp,
3518 XATTR_NAME_SMACKTRANSMUTE,
3519 TRANS_TRUE, TRANS_TRUE_SIZE,
3522 rc = inode->i_op->getxattr(dp,
3523 XATTR_NAME_SMACKTRANSMUTE, trattr,
3525 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3526 TRANS_TRUE_SIZE) != 0)
3530 transflag = SMK_INODE_TRANSMUTE;
3533 * Don't let the exec or mmap label be "*" or "@".
3535 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3536 if (IS_ERR(skp) || skp == &smack_known_star ||
3537 skp == &smack_known_web)
3539 isp->smk_task = skp;
3541 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3542 if (IS_ERR(skp) || skp == &smack_known_star ||
3543 skp == &smack_known_web)
3545 isp->smk_mmap = skp;
3552 isp->smk_inode = ckp;
3554 isp->smk_inode = final;
3556 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3559 mutex_unlock(&isp->smk_lock);
3564 * smack_getprocattr - Smack process attribute access
3565 * @p: the object task
3566 * @name: the name of the attribute in /proc/.../attr
3567 * @value: where to put the result
3569 * Places a copy of the task Smack into value
3571 * Returns the length of the smack label or an error code
3573 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3575 struct smack_known *skp = smk_of_task_struct(p);
3579 if (strcmp(name, "current") != 0)
3582 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3592 * smack_setprocattr - Smack process attribute setting
3593 * @p: the object task
3594 * @name: the name of the attribute in /proc/.../attr
3595 * @value: the value to set
3596 * @size: the size of the value
3598 * Sets the Smack value of the task. Only setting self
3599 * is permitted and only with privilege
3601 * Returns the length of the smack label or an error code
3603 static int smack_setprocattr(struct task_struct *p, char *name,
3604 void *value, size_t size)
3606 struct task_smack *tsp = current_security();
3608 struct smack_known *skp;
3609 struct smack_known_list_elem *sklep;
3613 * Changing another process' Smack value is too dangerous
3614 * and supports no sane use case.
3619 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3622 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3625 if (strcmp(name, "current") != 0)
3628 skp = smk_import_entry(value, size);
3630 return PTR_ERR(skp);
3633 * No process is ever allowed the web ("@") label.
3635 if (skp == &smack_known_web)
3638 if (!smack_privileged(CAP_MAC_ADMIN)) {
3640 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3641 if (sklep->smk_label == skp) {
3649 new = prepare_creds();
3653 tsp = new->security;
3654 tsp->smk_task = skp;
3656 * process can change its label only once
3658 smk_destroy_label_list(&tsp->smk_relabel);
3665 * smack_unix_stream_connect - Smack access on UDS
3667 * @other: the other sock
3670 * Return 0 if a subject with the smack of sock could access
3671 * an object with the smack of other, otherwise an error code
3673 static int smack_unix_stream_connect(struct sock *sock,
3674 struct sock *other, struct sock *newsk)
3676 struct smack_known *skp;
3677 struct smack_known *okp;
3678 struct socket_smack *ssp = sock->sk_security;
3679 struct socket_smack *osp = other->sk_security;
3680 struct socket_smack *nsp = newsk->sk_security;
3681 struct smk_audit_info ad;
3684 struct lsm_network_audit net;
3687 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3691 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3692 smk_ad_setfield_u_net_sk(&ad, other);
3694 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3695 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3699 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3700 rc = smk_bu_note("UDS connect", okp, skp,
3706 * Cross reference the peer labels for SO_PEERSEC.
3709 nsp->smk_packet = ssp->smk_out;
3710 ssp->smk_packet = osp->smk_out;
3717 * smack_unix_may_send - Smack access on UDS
3719 * @other: the other socket
3721 * Return 0 if a subject with the smack of sock could access
3722 * an object with the smack of other, otherwise an error code
3724 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3726 struct socket_smack *ssp = sock->sk->sk_security;
3727 struct socket_smack *osp = other->sk->sk_security;
3728 struct smk_audit_info ad;
3732 struct lsm_network_audit net;
3734 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3735 smk_ad_setfield_u_net_sk(&ad, other->sk);
3738 if (smack_privileged(CAP_MAC_OVERRIDE))
3741 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3742 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3747 * smack_socket_sendmsg - Smack check based on destination host
3750 * @size: the size of the message
3752 * Return 0 if the current subject can write to the destination host.
3753 * For IPv4 this is only a question if the destination is a single label host.
3754 * For IPv6 this is a check against the label of the port.
3756 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3759 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3760 #if IS_ENABLED(CONFIG_IPV6)
3761 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3763 #ifdef SMACK_IPV6_SECMARK_LABELING
3764 struct socket_smack *ssp = sock->sk->sk_security;
3765 struct smack_known *rsp;
3770 * Perfectly reasonable for this to be NULL
3775 switch (sock->sk->sk_family) {
3777 rc = smack_netlabel_send(sock->sk, sip);
3780 #ifdef SMACK_IPV6_SECMARK_LABELING
3781 rsp = smack_ipv6host_label(sap);
3783 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3786 #ifdef SMACK_IPV6_PORT_LABELING
3787 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3795 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3796 * @sap: netlabel secattr
3797 * @ssp: socket security information
3799 * Returns a pointer to a Smack label entry found on the label list.
3801 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3802 struct socket_smack *ssp)
3804 struct smack_known *skp;
3809 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3811 * Looks like a CIPSO packet.
3812 * If there are flags but no level netlabel isn't
3813 * behaving the way we expect it to.
3815 * Look it up in the label table
3816 * Without guidance regarding the smack value
3817 * for the packet fall back on the network
3821 list_for_each_entry(skp, &smack_known_list, list) {
3822 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3825 * Compare the catsets. Use the netlbl APIs.
3827 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3828 if ((skp->smk_netlabel.flags &
3829 NETLBL_SECATTR_MLS_CAT) == 0)
3833 for (acat = -1, kcat = -1; acat == kcat; ) {
3834 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3836 kcat = netlbl_catmap_walk(
3837 skp->smk_netlabel.attr.mls.cat,
3839 if (acat < 0 || kcat < 0)
3852 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3853 return &smack_known_web;
3854 return &smack_known_star;
3856 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3858 * Looks like a fallback, which gives us a secid.
3860 skp = smack_from_secid(sap->attr.secid);
3862 * This has got to be a bug because it is
3863 * impossible to specify a fallback without
3864 * specifying the label, which will ensure
3865 * it has a secid, and the only way to get a
3866 * secid is from a fallback.
3868 BUG_ON(skp == NULL);
3872 * Without guidance regarding the smack value
3873 * for the packet fall back on the network
3876 return smack_net_ambient;
3879 #if IS_ENABLED(CONFIG_IPV6)
3880 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3884 int proto = -EINVAL;
3885 struct ipv6hdr _ipv6h;
3886 struct ipv6hdr *ip6;
3888 struct tcphdr _tcph, *th;
3889 struct udphdr _udph, *uh;
3890 struct dccp_hdr _dccph, *dh;
3894 offset = skb_network_offset(skb);
3895 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3898 sip->sin6_addr = ip6->saddr;
3900 nexthdr = ip6->nexthdr;
3901 offset += sizeof(_ipv6h);
3902 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3909 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3911 sip->sin6_port = th->source;
3914 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3916 sip->sin6_port = uh->source;
3919 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3921 sip->sin6_port = dh->dccph_sport;
3926 #endif /* CONFIG_IPV6 */
3929 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3933 * Returns 0 if the packet should be delivered, an error code otherwise
3935 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3937 struct netlbl_lsm_secattr secattr;
3938 struct socket_smack *ssp = sk->sk_security;
3939 struct smack_known *skp = NULL;
3941 struct smk_audit_info ad;
3943 struct lsm_network_audit net;
3945 #if IS_ENABLED(CONFIG_IPV6)
3946 struct sockaddr_in6 sadd;
3948 #endif /* CONFIG_IPV6 */
3950 switch (sk->sk_family) {
3952 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3954 * If there is a secmark use it rather than the CIPSO label.
3955 * If there is no secmark fall back to CIPSO.
3956 * The secmark is assumed to reflect policy better.
3958 if (skb && skb->secmark != 0) {
3959 skp = smack_from_secid(skb->secmark);
3962 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3964 * Translate what netlabel gave us.
3966 netlbl_secattr_init(&secattr);
3968 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3970 skp = smack_from_secattr(&secattr, ssp);
3972 skp = smack_net_ambient;
3974 netlbl_secattr_destroy(&secattr);
3976 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3980 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3981 ad.a.u.net->family = sk->sk_family;
3982 ad.a.u.net->netif = skb->skb_iif;
3983 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3986 * Receiving a packet requires that the other end
3987 * be able to write here. Read access is not required.
3988 * This is the simplist possible security model
3991 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3992 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
3995 netlbl_skbuff_err(skb, rc, 0);
3997 #if IS_ENABLED(CONFIG_IPV6)
3999 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4000 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4002 #ifdef SMACK_IPV6_SECMARK_LABELING
4003 if (skb && skb->secmark != 0)
4004 skp = smack_from_secid(skb->secmark);
4006 skp = smack_ipv6host_label(&sadd);
4008 skp = smack_net_ambient;
4010 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4011 ad.a.u.net->family = sk->sk_family;
4012 ad.a.u.net->netif = skb->skb_iif;
4013 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4014 #endif /* CONFIG_AUDIT */
4015 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4016 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4018 #endif /* SMACK_IPV6_SECMARK_LABELING */
4019 #ifdef SMACK_IPV6_PORT_LABELING
4020 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4021 #endif /* SMACK_IPV6_PORT_LABELING */
4023 #endif /* CONFIG_IPV6 */
4030 * smack_socket_getpeersec_stream - pull in packet label
4032 * @optval: user's destination
4033 * @optlen: size thereof
4036 * returns zero on success, an error code otherwise
4038 static int smack_socket_getpeersec_stream(struct socket *sock,
4039 char __user *optval,
4040 int __user *optlen, unsigned len)
4042 struct socket_smack *ssp;
4047 ssp = sock->sk->sk_security;
4048 if (ssp->smk_packet != NULL) {
4049 rcp = ssp->smk_packet->smk_known;
4050 slen = strlen(rcp) + 1;
4055 else if (copy_to_user(optval, rcp, slen) != 0)
4058 if (put_user(slen, optlen) != 0)
4066 * smack_socket_getpeersec_dgram - pull in packet label
4067 * @sock: the peer socket
4069 * @secid: pointer to where to put the secid of the packet
4071 * Sets the netlabel socket state on sk from parent
4073 static int smack_socket_getpeersec_dgram(struct socket *sock,
4074 struct sk_buff *skb, u32 *secid)
4077 struct netlbl_lsm_secattr secattr;
4078 struct socket_smack *ssp = NULL;
4079 struct smack_known *skp;
4080 int family = PF_UNSPEC;
4081 u32 s = 0; /* 0 is the invalid secid */
4085 if (skb->protocol == htons(ETH_P_IP))
4087 #if IS_ENABLED(CONFIG_IPV6)
4088 else if (skb->protocol == htons(ETH_P_IPV6))
4090 #endif /* CONFIG_IPV6 */
4092 if (family == PF_UNSPEC && sock != NULL)
4093 family = sock->sk->sk_family;
4097 ssp = sock->sk->sk_security;
4098 s = ssp->smk_out->smk_secid;
4101 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4107 * Translate what netlabel gave us.
4109 if (sock != NULL && sock->sk != NULL)
4110 ssp = sock->sk->sk_security;
4111 netlbl_secattr_init(&secattr);
4112 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4114 skp = smack_from_secattr(&secattr, ssp);
4117 netlbl_secattr_destroy(&secattr);
4120 #ifdef SMACK_IPV6_SECMARK_LABELING
4132 * smack_sock_graft - Initialize a newly created socket with an existing sock
4134 * @parent: parent socket
4136 * Set the smk_{in,out} state of an existing sock based on the process that
4137 * is creating the new socket.
4139 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4141 struct socket_smack *ssp;
4142 struct smack_known *skp = smk_of_current();
4145 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4148 ssp = sk->sk_security;
4151 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4155 * smack_inet_conn_request - Smack access check on connect
4156 * @sk: socket involved
4160 * Returns 0 if a task with the packet label could write to
4161 * the socket, otherwise an error code
4163 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4164 struct request_sock *req)
4166 u16 family = sk->sk_family;
4167 struct smack_known *skp;
4168 struct socket_smack *ssp = sk->sk_security;
4169 struct netlbl_lsm_secattr secattr;
4170 struct sockaddr_in addr;
4172 struct smack_known *hskp;
4174 struct smk_audit_info ad;
4176 struct lsm_network_audit net;
4179 #if IS_ENABLED(CONFIG_IPV6)
4180 if (family == PF_INET6) {
4182 * Handle mapped IPv4 packets arriving
4183 * via IPv6 sockets. Don't set up netlabel
4184 * processing on IPv6.
4186 if (skb->protocol == htons(ETH_P_IP))
4191 #endif /* CONFIG_IPV6 */
4193 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4195 * If there is a secmark use it rather than the CIPSO label.
4196 * If there is no secmark fall back to CIPSO.
4197 * The secmark is assumed to reflect policy better.
4199 if (skb && skb->secmark != 0) {
4200 skp = smack_from_secid(skb->secmark);
4203 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4205 netlbl_secattr_init(&secattr);
4206 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4208 skp = smack_from_secattr(&secattr, ssp);
4210 skp = &smack_known_huh;
4211 netlbl_secattr_destroy(&secattr);
4213 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4218 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4219 ad.a.u.net->family = family;
4220 ad.a.u.net->netif = skb->skb_iif;
4221 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4224 * Receiving a packet requires that the other end be able to write
4225 * here. Read access is not required.
4227 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4228 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4233 * Save the peer's label in the request_sock so we can later setup
4234 * smk_packet in the child socket so that SO_PEERCRED can report it.
4236 req->peer_secid = skp->smk_secid;
4239 * We need to decide if we want to label the incoming connection here
4240 * if we do we only need to label the request_sock and the stack will
4241 * propagate the wire-label to the sock when it is created.
4244 addr.sin_addr.s_addr = hdr->saddr;
4246 hskp = smack_ipv4host_label(&addr);
4250 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4252 netlbl_req_delattr(req);
4258 * smack_inet_csk_clone - Copy the connection information to the new socket
4259 * @sk: the new socket
4260 * @req: the connection's request_sock
4262 * Transfer the connection's peer label to the newly created socket.
4264 static void smack_inet_csk_clone(struct sock *sk,
4265 const struct request_sock *req)
4267 struct socket_smack *ssp = sk->sk_security;
4268 struct smack_known *skp;
4270 if (req->peer_secid != 0) {
4271 skp = smack_from_secid(req->peer_secid);
4272 ssp->smk_packet = skp;
4274 ssp->smk_packet = NULL;
4278 * Key management security hooks
4280 * Casey has not tested key support very heavily.
4281 * The permission check is most likely too restrictive.
4282 * If you care about keys please have a look.
4287 * smack_key_alloc - Set the key security blob
4289 * @cred: the credentials to use
4292 * No allocation required
4296 static int smack_key_alloc(struct key *key, const struct cred *cred,
4297 unsigned long flags)
4299 struct smack_known *skp = smk_of_task(cred->security);
4301 key->security = skp;
4306 * smack_key_free - Clear the key security blob
4309 * Clear the blob pointer
4311 static void smack_key_free(struct key *key)
4313 key->security = NULL;
4317 * smack_key_permission - Smack access on a key
4318 * @key_ref: gets to the object
4319 * @cred: the credentials to use
4320 * @perm: requested key permissions
4322 * Return 0 if the task has read and write to the object,
4323 * an error code otherwise
4325 static int smack_key_permission(key_ref_t key_ref,
4326 const struct cred *cred, unsigned perm)
4329 struct smk_audit_info ad;
4330 struct smack_known *tkp = smk_of_task(cred->security);
4334 keyp = key_ref_to_ptr(key_ref);
4338 * If the key hasn't been initialized give it access so that
4341 if (keyp->security == NULL)
4344 * This should not occur
4349 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4350 ad.a.u.key_struct.key = keyp->serial;
4351 ad.a.u.key_struct.key_desc = keyp->description;
4353 if (perm & KEY_NEED_READ)
4355 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4356 request = MAY_WRITE;
4357 rc = smk_access(tkp, keyp->security, request, &ad);
4358 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4363 * smack_key_getsecurity - Smack label tagging the key
4364 * @key points to the key to be queried
4365 * @_buffer points to a pointer that should be set to point to the
4366 * resulting string (if no label or an error occurs).
4367 * Return the length of the string (including terminating NUL) or -ve if
4369 * May also return 0 (and a NULL buffer pointer) if there is no label.
4371 static int smack_key_getsecurity(struct key *key, char **_buffer)
4373 struct smack_known *skp = key->security;
4377 if (key->security == NULL) {
4382 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4385 length = strlen(copy) + 1;
4391 #endif /* CONFIG_KEYS */
4396 * Audit requires a unique representation of each Smack specific
4397 * rule. This unique representation is used to distinguish the
4398 * object to be audited from remaining kernel objects and also
4399 * works as a glue between the audit hooks.
4401 * Since repository entries are added but never deleted, we'll use
4402 * the smack_known label address related to the given audit rule as
4403 * the needed unique representation. This also better fits the smack
4404 * model where nearly everything is a label.
4409 * smack_audit_rule_init - Initialize a smack audit rule
4410 * @field: audit rule fields given from user-space (audit.h)
4411 * @op: required testing operator (=, !=, >, <, ...)
4412 * @rulestr: smack label to be audited
4413 * @vrule: pointer to save our own audit rule representation
4415 * Prepare to audit cases where (@field @op @rulestr) is true.
4416 * The label to be audited is created if necessay.
4418 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4420 struct smack_known *skp;
4421 char **rule = (char **)vrule;
4424 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4427 if (op != Audit_equal && op != Audit_not_equal)
4430 skp = smk_import_entry(rulestr, 0);
4432 return PTR_ERR(skp);
4434 *rule = skp->smk_known;
4440 * smack_audit_rule_known - Distinguish Smack audit rules
4441 * @krule: rule of interest, in Audit kernel representation format
4443 * This is used to filter Smack rules from remaining Audit ones.
4444 * If it's proved that this rule belongs to us, the
4445 * audit_rule_match hook will be called to do the final judgement.
4447 static int smack_audit_rule_known(struct audit_krule *krule)
4449 struct audit_field *f;
4452 for (i = 0; i < krule->field_count; i++) {
4453 f = &krule->fields[i];
4455 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4463 * smack_audit_rule_match - Audit given object ?
4464 * @secid: security id for identifying the object to test
4465 * @field: audit rule flags given from user-space
4466 * @op: required testing operator
4467 * @vrule: smack internal rule presentation
4468 * @actx: audit context associated with the check
4470 * The core Audit hook. It's used to take the decision of
4471 * whether to audit or not to audit a given object.
4473 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4474 struct audit_context *actx)
4476 struct smack_known *skp;
4479 if (unlikely(!rule)) {
4480 WARN_ONCE(1, "Smack: missing rule\n");
4484 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4487 skp = smack_from_secid(secid);
4490 * No need to do string comparisons. If a match occurs,
4491 * both pointers will point to the same smack_known
4494 if (op == Audit_equal)
4495 return (rule == skp->smk_known);
4496 if (op == Audit_not_equal)
4497 return (rule != skp->smk_known);
4503 * There is no need for a smack_audit_rule_free hook.
4504 * No memory was allocated.
4507 #endif /* CONFIG_AUDIT */
4510 * smack_ismaclabel - check if xattr @name references a smack MAC label
4511 * @name: Full xattr name to check.
4513 static int smack_ismaclabel(const char *name)
4515 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4520 * smack_secid_to_secctx - return the smack label for a secid
4521 * @secid: incoming integer
4522 * @secdata: destination
4523 * @seclen: how long it is
4525 * Exists for networking code.
4527 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4529 struct smack_known *skp = smack_from_secid(secid);
4532 *secdata = skp->smk_known;
4533 *seclen = strlen(skp->smk_known);
4538 * smack_secctx_to_secid - return the secid for a smack label
4539 * @secdata: smack label
4540 * @seclen: how long result is
4541 * @secid: outgoing integer
4543 * Exists for audit and networking code.
4545 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4547 struct smack_known *skp = smk_find_entry(secdata);
4550 *secid = skp->smk_secid;
4557 * There used to be a smack_release_secctx hook
4558 * that did nothing back when hooks were in a vector.
4559 * Now that there's a list such a hook adds cost.
4562 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4564 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4567 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4569 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4572 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4575 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4583 static struct security_hook_list smack_hooks[] = {
4584 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4585 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4586 LSM_HOOK_INIT(syslog, smack_syslog),
4588 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4589 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4590 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4591 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4592 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4593 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4594 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4596 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4597 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4598 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4600 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4601 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4602 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4603 LSM_HOOK_INIT(inode_link, smack_inode_link),
4604 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4605 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4606 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4607 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4608 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4609 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4610 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4611 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4612 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4613 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4614 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4615 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4616 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4617 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4619 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4620 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4621 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4622 LSM_HOOK_INIT(file_lock, smack_file_lock),
4623 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4624 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4625 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4626 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4627 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4628 LSM_HOOK_INIT(file_receive, smack_file_receive),
4630 LSM_HOOK_INIT(file_open, smack_file_open),
4632 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4633 LSM_HOOK_INIT(cred_free, smack_cred_free),
4634 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4635 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4636 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4637 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4638 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4639 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4640 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4641 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4642 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4643 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4644 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4645 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4646 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4647 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4648 LSM_HOOK_INIT(task_kill, smack_task_kill),
4649 LSM_HOOK_INIT(task_wait, smack_task_wait),
4650 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4652 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4653 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4655 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4656 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4658 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4659 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4660 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4661 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4662 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4663 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4665 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4666 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4667 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4668 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4669 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4671 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4672 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4673 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4674 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4675 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4677 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4679 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4680 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4682 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4683 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4685 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4686 #ifdef SMACK_IPV6_PORT_LABELING
4687 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4689 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4690 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4691 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4692 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4693 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4694 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4695 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4696 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4697 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4698 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4700 /* key management security hooks */
4702 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4703 LSM_HOOK_INIT(key_free, smack_key_free),
4704 LSM_HOOK_INIT(key_permission, smack_key_permission),
4705 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4706 #endif /* CONFIG_KEYS */
4710 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4711 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4712 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4713 #endif /* CONFIG_AUDIT */
4715 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4716 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4717 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4718 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4719 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4720 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4724 static __init void init_smack_known_list(void)
4727 * Initialize rule list locks
4729 mutex_init(&smack_known_huh.smk_rules_lock);
4730 mutex_init(&smack_known_hat.smk_rules_lock);
4731 mutex_init(&smack_known_floor.smk_rules_lock);
4732 mutex_init(&smack_known_star.smk_rules_lock);
4733 mutex_init(&smack_known_invalid.smk_rules_lock);
4734 mutex_init(&smack_known_web.smk_rules_lock);
4736 * Initialize rule lists
4738 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4739 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4740 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4741 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4742 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4743 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4745 * Create the known labels list
4747 smk_insert_entry(&smack_known_huh);
4748 smk_insert_entry(&smack_known_hat);
4749 smk_insert_entry(&smack_known_star);
4750 smk_insert_entry(&smack_known_floor);
4751 smk_insert_entry(&smack_known_invalid);
4752 smk_insert_entry(&smack_known_web);
4756 * smack_init - initialize the smack system
4760 static __init int smack_init(void)
4763 struct task_smack *tsp;
4765 if (!security_module_enable("smack"))
4768 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4769 if (!smack_inode_cache)
4772 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4775 kmem_cache_destroy(smack_inode_cache);
4781 pr_info("Smack: Initializing.\n");
4782 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4783 pr_info("Smack: Netfilter enabled.\n");
4785 #ifdef SMACK_IPV6_PORT_LABELING
4786 pr_info("Smack: IPv6 port labeling enabled.\n");
4788 #ifdef SMACK_IPV6_SECMARK_LABELING
4789 pr_info("Smack: IPv6 Netfilter enabled.\n");
4793 * Set the security state for the initial task.
4795 cred = (struct cred *) current->cred;
4796 cred->security = tsp;
4798 /* initialize the smack_known_list */
4799 init_smack_known_list();
4804 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks));
4810 * Smack requires early initialization in order to label
4811 * all processes and objects when they are created.
4813 security_initcall(smack_init);