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, ip, 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 = dentry->d_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);
2231 return 0; /* null signal; existence test */
2233 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2234 smk_ad_setfield_u_tsk(&ad, p);
2236 * Sending a signal requires that the sender
2237 * can write the receiver.
2240 rc = smk_curacc(tkp, MAY_WRITE, &ad);
2241 rc = smk_bu_task(p, MAY_WRITE, rc);
2245 * If the secid isn't 0 we're dealing with some USB IO
2246 * specific behavior. This is not clean. For one thing
2247 * we can't take privilege into account.
2249 skp = smack_from_secid(secid);
2250 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2251 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
2256 * smack_task_wait - Smack access check for waiting
2257 * @p: task to wait for
2261 static int smack_task_wait(struct task_struct *p)
2264 * Allow the operation to succeed.
2266 * In userless environments (e.g. phones) programs
2267 * get marked with SMACK64EXEC and even if the parent
2268 * and child shouldn't be talking the parent still
2269 * may expect to know when the child exits.
2275 * smack_task_to_inode - copy task smack into the inode blob
2276 * @p: task to copy from
2277 * @inode: inode to copy to
2279 * Sets the smack pointer in the inode security blob
2281 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2283 struct inode_smack *isp = inode->i_security;
2284 struct smack_known *skp = smk_of_task_struct(p);
2286 isp->smk_inode = skp;
2294 * smack_sk_alloc_security - Allocate a socket blob
2297 * @gfp_flags: memory allocation flags
2299 * Assign Smack pointers to current
2301 * Returns 0 on success, -ENOMEM is there's no memory
2303 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2305 struct smack_known *skp = smk_of_current();
2306 struct socket_smack *ssp;
2308 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2314 ssp->smk_packet = NULL;
2316 sk->sk_security = ssp;
2322 * smack_sk_free_security - Free a socket blob
2325 * Clears the blob pointer
2327 static void smack_sk_free_security(struct sock *sk)
2329 kfree(sk->sk_security);
2333 * smack_ipv4host_label - check host based restrictions
2334 * @sip: the object end
2336 * looks for host based access restrictions
2338 * This version will only be appropriate for really small sets of single label
2339 * hosts. The caller is responsible for ensuring that the RCU read lock is
2340 * taken before calling this function.
2342 * Returns the label of the far end or NULL if it's not special.
2344 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2346 struct smk_net4addr *snp;
2347 struct in_addr *siap = &sip->sin_addr;
2349 if (siap->s_addr == 0)
2352 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2354 * we break after finding the first match because
2355 * the list is sorted from longest to shortest mask
2356 * so we have found the most specific match
2358 if (snp->smk_host.s_addr ==
2359 (siap->s_addr & snp->smk_mask.s_addr))
2360 return snp->smk_label;
2365 #if IS_ENABLED(CONFIG_IPV6)
2367 * smk_ipv6_localhost - Check for local ipv6 host address
2370 * Returns boolean true if this is the localhost address
2372 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2374 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2375 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2377 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2378 ntohs(be16p[7]) == 1)
2384 * smack_ipv6host_label - check host based restrictions
2385 * @sip: the object end
2387 * looks for host based access restrictions
2389 * This version will only be appropriate for really small sets of single label
2390 * hosts. The caller is responsible for ensuring that the RCU read lock is
2391 * taken before calling this function.
2393 * Returns the label of the far end or NULL if it's not special.
2395 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2397 struct smk_net6addr *snp;
2398 struct in6_addr *sap = &sip->sin6_addr;
2403 * It's local. Don't look for a host label.
2405 if (smk_ipv6_localhost(sip))
2408 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2410 * we break after finding the first match because
2411 * the list is sorted from longest to shortest mask
2412 * so we have found the most specific match
2414 for (found = 1, i = 0; i < 8; i++) {
2416 * If the label is NULL the entry has
2417 * been renounced. Ignore it.
2419 if (snp->smk_label == NULL)
2421 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2422 snp->smk_host.s6_addr16[i]) {
2428 return snp->smk_label;
2433 #endif /* CONFIG_IPV6 */
2436 * smack_netlabel - Set the secattr on a socket
2438 * @labeled: socket label scheme
2440 * Convert the outbound smack value (smk_out) to a
2441 * secattr and attach it to the socket.
2443 * Returns 0 on success or an error code
2445 static int smack_netlabel(struct sock *sk, int labeled)
2447 struct smack_known *skp;
2448 struct socket_smack *ssp = sk->sk_security;
2452 * Usually the netlabel code will handle changing the
2453 * packet labeling based on the label.
2454 * The case of a single label host is different, because
2455 * a single label host should never get a labeled packet
2456 * even though the label is usually associated with a packet
2460 bh_lock_sock_nested(sk);
2462 if (ssp->smk_out == smack_net_ambient ||
2463 labeled == SMACK_UNLABELED_SOCKET)
2464 netlbl_sock_delattr(sk);
2467 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2477 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2479 * @sap: the destination address
2481 * Set the correct secattr for the given socket based on the destination
2482 * address and perform any outbound access checks needed.
2484 * Returns 0 on success or an error code.
2487 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2489 struct smack_known *skp;
2492 struct smack_known *hkp;
2493 struct socket_smack *ssp = sk->sk_security;
2494 struct smk_audit_info ad;
2497 hkp = smack_ipv4host_label(sap);
2500 struct lsm_network_audit net;
2502 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2503 ad.a.u.net->family = sap->sin_family;
2504 ad.a.u.net->dport = sap->sin_port;
2505 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2507 sk_lbl = SMACK_UNLABELED_SOCKET;
2509 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2510 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2512 sk_lbl = SMACK_CIPSO_SOCKET;
2519 return smack_netlabel(sk, sk_lbl);
2522 #if IS_ENABLED(CONFIG_IPV6)
2524 * smk_ipv6_check - check Smack access
2525 * @subject: subject Smack label
2526 * @object: object Smack label
2528 * @act: the action being taken
2530 * Check an IPv6 access
2532 static int smk_ipv6_check(struct smack_known *subject,
2533 struct smack_known *object,
2534 struct sockaddr_in6 *address, int act)
2537 struct lsm_network_audit net;
2539 struct smk_audit_info ad;
2543 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2544 ad.a.u.net->family = PF_INET6;
2545 ad.a.u.net->dport = ntohs(address->sin6_port);
2546 if (act == SMK_RECEIVING)
2547 ad.a.u.net->v6info.saddr = address->sin6_addr;
2549 ad.a.u.net->v6info.daddr = address->sin6_addr;
2551 rc = smk_access(subject, object, MAY_WRITE, &ad);
2552 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2555 #endif /* CONFIG_IPV6 */
2557 #ifdef SMACK_IPV6_PORT_LABELING
2559 * smk_ipv6_port_label - Smack port access table management
2563 * Create or update the port list entry
2565 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2567 struct sock *sk = sock->sk;
2568 struct sockaddr_in6 *addr6;
2569 struct socket_smack *ssp = sock->sk->sk_security;
2570 struct smk_port_label *spp;
2571 unsigned short port = 0;
2573 if (address == NULL) {
2575 * This operation is changing the Smack information
2576 * on the bound socket. Take the changes to the port
2579 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2580 if (sk != spp->smk_sock)
2582 spp->smk_in = ssp->smk_in;
2583 spp->smk_out = ssp->smk_out;
2587 * A NULL address is only used for updating existing
2588 * bound entries. If there isn't one, it's OK.
2593 addr6 = (struct sockaddr_in6 *)address;
2594 port = ntohs(addr6->sin6_port);
2596 * This is a special case that is safely ignored.
2602 * Look for an existing port list entry.
2603 * This is an indication that a port is getting reused.
2605 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2606 if (spp->smk_port != port)
2608 spp->smk_port = port;
2610 spp->smk_in = ssp->smk_in;
2611 spp->smk_out = ssp->smk_out;
2616 * A new port entry is required.
2618 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2622 spp->smk_port = port;
2624 spp->smk_in = ssp->smk_in;
2625 spp->smk_out = ssp->smk_out;
2627 list_add(&spp->list, &smk_ipv6_port_list);
2632 * smk_ipv6_port_check - check Smack port access
2636 * Create or update the port list entry
2638 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2641 struct smk_port_label *spp;
2642 struct socket_smack *ssp = sk->sk_security;
2643 struct smack_known *skp = NULL;
2644 unsigned short port;
2645 struct smack_known *object;
2647 if (act == SMK_RECEIVING) {
2648 skp = smack_ipv6host_label(address);
2649 object = ssp->smk_in;
2652 object = smack_ipv6host_label(address);
2656 * The other end is a single label host.
2658 if (skp != NULL && object != NULL)
2659 return smk_ipv6_check(skp, object, address, act);
2661 skp = smack_net_ambient;
2663 object = smack_net_ambient;
2666 * It's remote, so port lookup does no good.
2668 if (!smk_ipv6_localhost(address))
2669 return smk_ipv6_check(skp, object, address, act);
2672 * It's local so the send check has to have passed.
2674 if (act == SMK_RECEIVING)
2677 port = ntohs(address->sin6_port);
2678 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2679 if (spp->smk_port != port)
2681 object = spp->smk_in;
2682 if (act == SMK_CONNECTING)
2683 ssp->smk_packet = spp->smk_out;
2687 return smk_ipv6_check(skp, object, address, act);
2689 #endif /* SMACK_IPV6_PORT_LABELING */
2692 * smack_inode_setsecurity - set smack xattrs
2693 * @inode: the object
2694 * @name: attribute name
2695 * @value: attribute value
2696 * @size: size of the attribute
2699 * Sets the named attribute in the appropriate blob
2701 * Returns 0 on success, or an error code
2703 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2704 const void *value, size_t size, int flags)
2706 struct smack_known *skp;
2707 struct inode_smack *nsp = inode->i_security;
2708 struct socket_smack *ssp;
2709 struct socket *sock;
2712 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2715 skp = smk_import_entry(value, size);
2717 return PTR_ERR(skp);
2719 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2720 nsp->smk_inode = skp;
2721 nsp->smk_flags |= SMK_INODE_INSTANT;
2725 * The rest of the Smack xattrs are only on sockets.
2727 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2730 sock = SOCKET_I(inode);
2731 if (sock == NULL || sock->sk == NULL)
2734 ssp = sock->sk->sk_security;
2736 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2738 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2740 if (sock->sk->sk_family == PF_INET) {
2741 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2744 "Smack: \"%s\" netlbl error %d.\n",
2750 #ifdef SMACK_IPV6_PORT_LABELING
2751 if (sock->sk->sk_family == PF_INET6)
2752 smk_ipv6_port_label(sock, NULL);
2759 * smack_socket_post_create - finish socket setup
2761 * @family: protocol family
2766 * Sets the netlabel information on the socket
2768 * Returns 0 on success, and error code otherwise
2770 static int smack_socket_post_create(struct socket *sock, int family,
2771 int type, int protocol, int kern)
2773 struct socket_smack *ssp;
2775 if (sock->sk == NULL)
2779 * Sockets created by kernel threads receive web label.
2781 if (unlikely(current->flags & PF_KTHREAD)) {
2782 ssp = sock->sk->sk_security;
2783 ssp->smk_in = &smack_known_web;
2784 ssp->smk_out = &smack_known_web;
2787 if (family != PF_INET)
2790 * Set the outbound netlbl.
2792 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2795 #ifdef SMACK_IPV6_PORT_LABELING
2797 * smack_socket_bind - record port binding information.
2799 * @address: the port address
2800 * @addrlen: size of the address
2802 * Records the label bound to a port.
2806 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2809 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2810 smk_ipv6_port_label(sock, address);
2813 #endif /* SMACK_IPV6_PORT_LABELING */
2816 * smack_socket_connect - connect access check
2818 * @sap: the other end
2819 * @addrlen: size of sap
2821 * Verifies that a connection may be possible
2823 * Returns 0 on success, and error code otherwise
2825 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2829 #if IS_ENABLED(CONFIG_IPV6)
2830 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2832 #ifdef SMACK_IPV6_SECMARK_LABELING
2833 struct smack_known *rsp;
2834 struct socket_smack *ssp = sock->sk->sk_security;
2837 if (sock->sk == NULL)
2840 switch (sock->sk->sk_family) {
2842 if (addrlen < sizeof(struct sockaddr_in))
2844 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2847 if (addrlen < sizeof(struct sockaddr_in6))
2849 #ifdef SMACK_IPV6_SECMARK_LABELING
2850 rsp = smack_ipv6host_label(sip);
2852 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2855 #ifdef SMACK_IPV6_PORT_LABELING
2856 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2864 * smack_flags_to_may - convert S_ to MAY_ values
2865 * @flags: the S_ value
2867 * Returns the equivalent MAY_ value
2869 static int smack_flags_to_may(int flags)
2873 if (flags & S_IRUGO)
2875 if (flags & S_IWUGO)
2877 if (flags & S_IXUGO)
2884 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2889 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2891 struct smack_known *skp = smk_of_current();
2893 msg->security = skp;
2898 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2901 * Clears the blob pointer
2903 static void smack_msg_msg_free_security(struct msg_msg *msg)
2905 msg->security = NULL;
2909 * smack_of_shm - the smack pointer for the shm
2912 * Returns a pointer to the smack value
2914 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2916 return (struct smack_known *)shp->shm_perm.security;
2920 * smack_shm_alloc_security - Set the security blob for shm
2925 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2927 struct kern_ipc_perm *isp = &shp->shm_perm;
2928 struct smack_known *skp = smk_of_current();
2930 isp->security = skp;
2935 * smack_shm_free_security - Clear the security blob for shm
2938 * Clears the blob pointer
2940 static void smack_shm_free_security(struct shmid_kernel *shp)
2942 struct kern_ipc_perm *isp = &shp->shm_perm;
2944 isp->security = NULL;
2948 * smk_curacc_shm : check if current has access on shm
2950 * @access : access requested
2952 * Returns 0 if current has the requested access, error code otherwise
2954 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2956 struct smack_known *ssp = smack_of_shm(shp);
2957 struct smk_audit_info ad;
2961 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2962 ad.a.u.ipc_id = shp->shm_perm.id;
2964 rc = smk_curacc(ssp, access, &ad);
2965 rc = smk_bu_current("shm", ssp, access, rc);
2970 * smack_shm_associate - Smack access check for shm
2972 * @shmflg: access requested
2974 * Returns 0 if current has the requested access, error code otherwise
2976 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2980 may = smack_flags_to_may(shmflg);
2981 return smk_curacc_shm(shp, may);
2985 * smack_shm_shmctl - Smack access check for shm
2987 * @cmd: what it wants to do
2989 * Returns 0 if current has the requested access, error code otherwise
2991 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3004 may = MAY_READWRITE;
3009 * System level information.
3015 return smk_curacc_shm(shp, may);
3019 * smack_shm_shmat - Smack access for shmat
3022 * @shmflg: access requested
3024 * Returns 0 if current has the requested access, error code otherwise
3026 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3031 may = smack_flags_to_may(shmflg);
3032 return smk_curacc_shm(shp, may);
3036 * smack_of_sem - the smack pointer for the sem
3039 * Returns a pointer to the smack value
3041 static struct smack_known *smack_of_sem(struct sem_array *sma)
3043 return (struct smack_known *)sma->sem_perm.security;
3047 * smack_sem_alloc_security - Set the security blob for sem
3052 static int smack_sem_alloc_security(struct sem_array *sma)
3054 struct kern_ipc_perm *isp = &sma->sem_perm;
3055 struct smack_known *skp = smk_of_current();
3057 isp->security = skp;
3062 * smack_sem_free_security - Clear the security blob for sem
3065 * Clears the blob pointer
3067 static void smack_sem_free_security(struct sem_array *sma)
3069 struct kern_ipc_perm *isp = &sma->sem_perm;
3071 isp->security = NULL;
3075 * smk_curacc_sem : check if current has access on sem
3077 * @access : access requested
3079 * Returns 0 if current has the requested access, error code otherwise
3081 static int smk_curacc_sem(struct sem_array *sma, int access)
3083 struct smack_known *ssp = smack_of_sem(sma);
3084 struct smk_audit_info ad;
3088 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3089 ad.a.u.ipc_id = sma->sem_perm.id;
3091 rc = smk_curacc(ssp, access, &ad);
3092 rc = smk_bu_current("sem", ssp, access, rc);
3097 * smack_sem_associate - Smack access check for sem
3099 * @semflg: access requested
3101 * Returns 0 if current has the requested access, error code otherwise
3103 static int smack_sem_associate(struct sem_array *sma, int semflg)
3107 may = smack_flags_to_may(semflg);
3108 return smk_curacc_sem(sma, may);
3112 * smack_sem_shmctl - Smack access check for sem
3114 * @cmd: what it wants to do
3116 * Returns 0 if current has the requested access, error code otherwise
3118 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3136 may = MAY_READWRITE;
3141 * System level information
3148 return smk_curacc_sem(sma, may);
3152 * smack_sem_semop - Smack checks of semaphore operations
3158 * Treated as read and write in all cases.
3160 * Returns 0 if access is allowed, error code otherwise
3162 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3163 unsigned nsops, int alter)
3165 return smk_curacc_sem(sma, MAY_READWRITE);
3169 * smack_msg_alloc_security - Set the security blob for msg
3174 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3176 struct kern_ipc_perm *kisp = &msq->q_perm;
3177 struct smack_known *skp = smk_of_current();
3179 kisp->security = skp;
3184 * smack_msg_free_security - Clear the security blob for msg
3187 * Clears the blob pointer
3189 static void smack_msg_queue_free_security(struct msg_queue *msq)
3191 struct kern_ipc_perm *kisp = &msq->q_perm;
3193 kisp->security = NULL;
3197 * smack_of_msq - the smack pointer for the msq
3200 * Returns a pointer to the smack label entry
3202 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3204 return (struct smack_known *)msq->q_perm.security;
3208 * smk_curacc_msq : helper to check if current has access on msq
3210 * @access : access requested
3212 * return 0 if current has access, error otherwise
3214 static int smk_curacc_msq(struct msg_queue *msq, int access)
3216 struct smack_known *msp = smack_of_msq(msq);
3217 struct smk_audit_info ad;
3221 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3222 ad.a.u.ipc_id = msq->q_perm.id;
3224 rc = smk_curacc(msp, access, &ad);
3225 rc = smk_bu_current("msq", msp, access, rc);
3230 * smack_msg_queue_associate - Smack access check for msg_queue
3232 * @msqflg: access requested
3234 * Returns 0 if current has the requested access, error code otherwise
3236 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3240 may = smack_flags_to_may(msqflg);
3241 return smk_curacc_msq(msq, may);
3245 * smack_msg_queue_msgctl - Smack access check for msg_queue
3247 * @cmd: what it wants to do
3249 * Returns 0 if current has the requested access, error code otherwise
3251 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3262 may = MAY_READWRITE;
3267 * System level information
3274 return smk_curacc_msq(msq, may);
3278 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3281 * @msqflg: access requested
3283 * Returns 0 if current has the requested access, error code otherwise
3285 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3290 may = smack_flags_to_may(msqflg);
3291 return smk_curacc_msq(msq, may);
3295 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3302 * Returns 0 if current has read and write access, error code otherwise
3304 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3305 struct task_struct *target, long type, int mode)
3307 return smk_curacc_msq(msq, MAY_READWRITE);
3311 * smack_ipc_permission - Smack access for ipc_permission()
3312 * @ipp: the object permissions
3313 * @flag: access requested
3315 * Returns 0 if current has read and write access, error code otherwise
3317 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3319 struct smack_known *iskp = ipp->security;
3320 int may = smack_flags_to_may(flag);
3321 struct smk_audit_info ad;
3325 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3326 ad.a.u.ipc_id = ipp->id;
3328 rc = smk_curacc(iskp, may, &ad);
3329 rc = smk_bu_current("svipc", iskp, may, rc);
3334 * smack_ipc_getsecid - Extract smack security id
3335 * @ipp: the object permissions
3336 * @secid: where result will be saved
3338 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3340 struct smack_known *iskp = ipp->security;
3342 *secid = iskp->smk_secid;
3346 * smack_d_instantiate - Make sure the blob is correct on an inode
3347 * @opt_dentry: dentry where inode will be attached
3348 * @inode: the object
3350 * Set the inode's security blob if it hasn't been done already.
3352 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3354 struct super_block *sbp;
3355 struct superblock_smack *sbsp;
3356 struct inode_smack *isp;
3357 struct smack_known *skp;
3358 struct smack_known *ckp = smk_of_current();
3359 struct smack_known *final;
3360 char trattr[TRANS_TRUE_SIZE];
3368 isp = inode->i_security;
3370 mutex_lock(&isp->smk_lock);
3372 * If the inode is already instantiated
3373 * take the quick way out
3375 if (isp->smk_flags & SMK_INODE_INSTANT)
3379 sbsp = sbp->s_security;
3381 * We're going to use the superblock default label
3382 * if there's no label on the file.
3384 final = sbsp->smk_default;
3387 * If this is the root inode the superblock
3388 * may be in the process of initialization.
3389 * If that is the case use the root value out
3390 * of the superblock.
3392 if (opt_dentry->d_parent == opt_dentry) {
3393 switch (sbp->s_magic) {
3394 case CGROUP_SUPER_MAGIC:
3396 * The cgroup filesystem is never mounted,
3397 * so there's no opportunity to set the mount
3400 sbsp->smk_root = &smack_known_star;
3401 sbsp->smk_default = &smack_known_star;
3402 isp->smk_inode = sbsp->smk_root;
3406 * What about shmem/tmpfs anonymous files with dentry
3407 * obtained from d_alloc_pseudo()?
3409 isp->smk_inode = smk_of_current();
3412 isp->smk_inode = smk_of_current();
3415 isp->smk_inode = sbsp->smk_root;
3418 isp->smk_flags |= SMK_INODE_INSTANT;
3423 * This is pretty hackish.
3424 * Casey says that we shouldn't have to do
3425 * file system specific code, but it does help
3426 * with keeping it simple.
3428 switch (sbp->s_magic) {
3432 case CGROUP_SUPER_MAGIC:
3434 * Casey says that it's a little embarrassing
3435 * that the smack file system doesn't do
3436 * extended attributes.
3438 * Casey says pipes are easy (?)
3440 * Socket access is controlled by the socket
3441 * structures associated with the task involved.
3443 * Cgroupfs is special
3445 final = &smack_known_star;
3447 case DEVPTS_SUPER_MAGIC:
3449 * devpts seems content with the label of the task.
3450 * Programs that change smack have to treat the
3455 case PROC_SUPER_MAGIC:
3457 * Casey says procfs appears not to care.
3458 * The superblock default suffices.
3463 * Device labels should come from the filesystem,
3464 * but watch out, because they're volitile,
3465 * getting recreated on every reboot.
3467 final = &smack_known_star;
3471 * If a smack value has been set we want to use it,
3472 * but since tmpfs isn't giving us the opportunity
3473 * to set mount options simulate setting the
3474 * superblock default.
3478 * This isn't an understood special case.
3479 * Get the value from the xattr.
3483 * UNIX domain sockets use lower level socket data.
3485 if (S_ISSOCK(inode->i_mode)) {
3486 final = &smack_known_star;
3490 * No xattr support means, alas, no SMACK label.
3491 * Use the aforeapplied default.
3492 * It would be curious if the label of the task
3493 * does not match that assigned.
3495 if (inode->i_op->getxattr == NULL)
3498 * Get the dentry for xattr.
3500 dp = dget(opt_dentry);
3501 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3502 if (!IS_ERR_OR_NULL(skp))
3506 * Transmuting directory
3508 if (S_ISDIR(inode->i_mode)) {
3510 * If this is a new directory and the label was
3511 * transmuted when the inode was initialized
3512 * set the transmute attribute on the directory
3513 * and mark the inode.
3515 * If there is a transmute attribute on the
3516 * directory mark the inode.
3518 if (isp->smk_flags & SMK_INODE_CHANGED) {
3519 isp->smk_flags &= ~SMK_INODE_CHANGED;
3520 rc = inode->i_op->setxattr(dp, inode,
3521 XATTR_NAME_SMACKTRANSMUTE,
3522 TRANS_TRUE, TRANS_TRUE_SIZE,
3525 rc = inode->i_op->getxattr(dp, inode,
3526 XATTR_NAME_SMACKTRANSMUTE, trattr,
3528 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3529 TRANS_TRUE_SIZE) != 0)
3533 transflag = SMK_INODE_TRANSMUTE;
3536 * Don't let the exec or mmap label be "*" or "@".
3538 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3539 if (IS_ERR(skp) || skp == &smack_known_star ||
3540 skp == &smack_known_web)
3542 isp->smk_task = skp;
3544 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3545 if (IS_ERR(skp) || skp == &smack_known_star ||
3546 skp == &smack_known_web)
3548 isp->smk_mmap = skp;
3555 isp->smk_inode = ckp;
3557 isp->smk_inode = final;
3559 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3562 mutex_unlock(&isp->smk_lock);
3567 * smack_getprocattr - Smack process attribute access
3568 * @p: the object task
3569 * @name: the name of the attribute in /proc/.../attr
3570 * @value: where to put the result
3572 * Places a copy of the task Smack into value
3574 * Returns the length of the smack label or an error code
3576 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3578 struct smack_known *skp = smk_of_task_struct(p);
3582 if (strcmp(name, "current") != 0)
3585 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3595 * smack_setprocattr - Smack process attribute setting
3596 * @p: the object task
3597 * @name: the name of the attribute in /proc/.../attr
3598 * @value: the value to set
3599 * @size: the size of the value
3601 * Sets the Smack value of the task. Only setting self
3602 * is permitted and only with privilege
3604 * Returns the length of the smack label or an error code
3606 static int smack_setprocattr(struct task_struct *p, char *name,
3607 void *value, size_t size)
3609 struct task_smack *tsp = current_security();
3611 struct smack_known *skp;
3612 struct smack_known_list_elem *sklep;
3616 * Changing another process' Smack value is too dangerous
3617 * and supports no sane use case.
3622 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3625 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3628 if (strcmp(name, "current") != 0)
3631 skp = smk_import_entry(value, size);
3633 return PTR_ERR(skp);
3636 * No process is ever allowed the web ("@") label.
3638 if (skp == &smack_known_web)
3641 if (!smack_privileged(CAP_MAC_ADMIN)) {
3643 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3644 if (sklep->smk_label == skp) {
3652 new = prepare_creds();
3656 tsp = new->security;
3657 tsp->smk_task = skp;
3659 * process can change its label only once
3661 smk_destroy_label_list(&tsp->smk_relabel);
3668 * smack_unix_stream_connect - Smack access on UDS
3670 * @other: the other sock
3673 * Return 0 if a subject with the smack of sock could access
3674 * an object with the smack of other, otherwise an error code
3676 static int smack_unix_stream_connect(struct sock *sock,
3677 struct sock *other, struct sock *newsk)
3679 struct smack_known *skp;
3680 struct smack_known *okp;
3681 struct socket_smack *ssp = sock->sk_security;
3682 struct socket_smack *osp = other->sk_security;
3683 struct socket_smack *nsp = newsk->sk_security;
3684 struct smk_audit_info ad;
3687 struct lsm_network_audit net;
3690 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3694 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3695 smk_ad_setfield_u_net_sk(&ad, other);
3697 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3698 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3702 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3703 rc = smk_bu_note("UDS connect", okp, skp,
3709 * Cross reference the peer labels for SO_PEERSEC.
3712 nsp->smk_packet = ssp->smk_out;
3713 ssp->smk_packet = osp->smk_out;
3720 * smack_unix_may_send - Smack access on UDS
3722 * @other: the other socket
3724 * Return 0 if a subject with the smack of sock could access
3725 * an object with the smack of other, otherwise an error code
3727 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3729 struct socket_smack *ssp = sock->sk->sk_security;
3730 struct socket_smack *osp = other->sk->sk_security;
3731 struct smk_audit_info ad;
3735 struct lsm_network_audit net;
3737 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3738 smk_ad_setfield_u_net_sk(&ad, other->sk);
3741 if (smack_privileged(CAP_MAC_OVERRIDE))
3744 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3745 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3750 * smack_socket_sendmsg - Smack check based on destination host
3753 * @size: the size of the message
3755 * Return 0 if the current subject can write to the destination host.
3756 * For IPv4 this is only a question if the destination is a single label host.
3757 * For IPv6 this is a check against the label of the port.
3759 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3762 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3763 #if IS_ENABLED(CONFIG_IPV6)
3764 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3766 #ifdef SMACK_IPV6_SECMARK_LABELING
3767 struct socket_smack *ssp = sock->sk->sk_security;
3768 struct smack_known *rsp;
3773 * Perfectly reasonable for this to be NULL
3778 switch (sock->sk->sk_family) {
3780 rc = smack_netlabel_send(sock->sk, sip);
3783 #ifdef SMACK_IPV6_SECMARK_LABELING
3784 rsp = smack_ipv6host_label(sap);
3786 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3789 #ifdef SMACK_IPV6_PORT_LABELING
3790 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3798 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3799 * @sap: netlabel secattr
3800 * @ssp: socket security information
3802 * Returns a pointer to a Smack label entry found on the label list.
3804 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3805 struct socket_smack *ssp)
3807 struct smack_known *skp;
3812 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3814 * Looks like a CIPSO packet.
3815 * If there are flags but no level netlabel isn't
3816 * behaving the way we expect it to.
3818 * Look it up in the label table
3819 * Without guidance regarding the smack value
3820 * for the packet fall back on the network
3824 list_for_each_entry(skp, &smack_known_list, list) {
3825 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3828 * Compare the catsets. Use the netlbl APIs.
3830 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3831 if ((skp->smk_netlabel.flags &
3832 NETLBL_SECATTR_MLS_CAT) == 0)
3836 for (acat = -1, kcat = -1; acat == kcat; ) {
3837 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3839 kcat = netlbl_catmap_walk(
3840 skp->smk_netlabel.attr.mls.cat,
3842 if (acat < 0 || kcat < 0)
3855 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3856 return &smack_known_web;
3857 return &smack_known_star;
3859 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3861 * Looks like a fallback, which gives us a secid.
3863 skp = smack_from_secid(sap->attr.secid);
3865 * This has got to be a bug because it is
3866 * impossible to specify a fallback without
3867 * specifying the label, which will ensure
3868 * it has a secid, and the only way to get a
3869 * secid is from a fallback.
3871 BUG_ON(skp == NULL);
3875 * Without guidance regarding the smack value
3876 * for the packet fall back on the network
3879 return smack_net_ambient;
3882 #if IS_ENABLED(CONFIG_IPV6)
3883 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3887 int proto = -EINVAL;
3888 struct ipv6hdr _ipv6h;
3889 struct ipv6hdr *ip6;
3891 struct tcphdr _tcph, *th;
3892 struct udphdr _udph, *uh;
3893 struct dccp_hdr _dccph, *dh;
3897 offset = skb_network_offset(skb);
3898 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3901 sip->sin6_addr = ip6->saddr;
3903 nexthdr = ip6->nexthdr;
3904 offset += sizeof(_ipv6h);
3905 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3912 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3914 sip->sin6_port = th->source;
3917 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3919 sip->sin6_port = uh->source;
3922 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3924 sip->sin6_port = dh->dccph_sport;
3929 #endif /* CONFIG_IPV6 */
3932 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3936 * Returns 0 if the packet should be delivered, an error code otherwise
3938 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3940 struct netlbl_lsm_secattr secattr;
3941 struct socket_smack *ssp = sk->sk_security;
3942 struct smack_known *skp = NULL;
3944 struct smk_audit_info ad;
3946 struct lsm_network_audit net;
3948 #if IS_ENABLED(CONFIG_IPV6)
3949 struct sockaddr_in6 sadd;
3951 #endif /* CONFIG_IPV6 */
3953 switch (sk->sk_family) {
3955 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3957 * If there is a secmark use it rather than the CIPSO label.
3958 * If there is no secmark fall back to CIPSO.
3959 * The secmark is assumed to reflect policy better.
3961 if (skb && skb->secmark != 0) {
3962 skp = smack_from_secid(skb->secmark);
3965 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3967 * Translate what netlabel gave us.
3969 netlbl_secattr_init(&secattr);
3971 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3973 skp = smack_from_secattr(&secattr, ssp);
3975 skp = smack_net_ambient;
3977 netlbl_secattr_destroy(&secattr);
3979 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3983 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3984 ad.a.u.net->family = sk->sk_family;
3985 ad.a.u.net->netif = skb->skb_iif;
3986 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3989 * Receiving a packet requires that the other end
3990 * be able to write here. Read access is not required.
3991 * This is the simplist possible security model
3994 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3995 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
3998 netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
4000 #if IS_ENABLED(CONFIG_IPV6)
4002 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4003 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4005 #ifdef SMACK_IPV6_SECMARK_LABELING
4006 if (skb && skb->secmark != 0)
4007 skp = smack_from_secid(skb->secmark);
4009 skp = smack_ipv6host_label(&sadd);
4011 skp = smack_net_ambient;
4013 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4014 ad.a.u.net->family = sk->sk_family;
4015 ad.a.u.net->netif = skb->skb_iif;
4016 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4017 #endif /* CONFIG_AUDIT */
4018 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4019 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4021 #endif /* SMACK_IPV6_SECMARK_LABELING */
4022 #ifdef SMACK_IPV6_PORT_LABELING
4023 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4024 #endif /* SMACK_IPV6_PORT_LABELING */
4026 #endif /* CONFIG_IPV6 */
4033 * smack_socket_getpeersec_stream - pull in packet label
4035 * @optval: user's destination
4036 * @optlen: size thereof
4039 * returns zero on success, an error code otherwise
4041 static int smack_socket_getpeersec_stream(struct socket *sock,
4042 char __user *optval,
4043 int __user *optlen, unsigned len)
4045 struct socket_smack *ssp;
4050 ssp = sock->sk->sk_security;
4051 if (ssp->smk_packet != NULL) {
4052 rcp = ssp->smk_packet->smk_known;
4053 slen = strlen(rcp) + 1;
4058 else if (copy_to_user(optval, rcp, slen) != 0)
4061 if (put_user(slen, optlen) != 0)
4069 * smack_socket_getpeersec_dgram - pull in packet label
4070 * @sock: the peer socket
4072 * @secid: pointer to where to put the secid of the packet
4074 * Sets the netlabel socket state on sk from parent
4076 static int smack_socket_getpeersec_dgram(struct socket *sock,
4077 struct sk_buff *skb, u32 *secid)
4080 struct netlbl_lsm_secattr secattr;
4081 struct socket_smack *ssp = NULL;
4082 struct smack_known *skp;
4083 int family = PF_UNSPEC;
4084 u32 s = 0; /* 0 is the invalid secid */
4088 if (skb->protocol == htons(ETH_P_IP))
4090 #if IS_ENABLED(CONFIG_IPV6)
4091 else if (skb->protocol == htons(ETH_P_IPV6))
4093 #endif /* CONFIG_IPV6 */
4095 if (family == PF_UNSPEC && sock != NULL)
4096 family = sock->sk->sk_family;
4100 ssp = sock->sk->sk_security;
4101 s = ssp->smk_out->smk_secid;
4104 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4110 * Translate what netlabel gave us.
4112 if (sock != NULL && sock->sk != NULL)
4113 ssp = sock->sk->sk_security;
4114 netlbl_secattr_init(&secattr);
4115 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4117 skp = smack_from_secattr(&secattr, ssp);
4120 netlbl_secattr_destroy(&secattr);
4123 #ifdef SMACK_IPV6_SECMARK_LABELING
4135 * smack_sock_graft - Initialize a newly created socket with an existing sock
4137 * @parent: parent socket
4139 * Set the smk_{in,out} state of an existing sock based on the process that
4140 * is creating the new socket.
4142 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4144 struct socket_smack *ssp;
4145 struct smack_known *skp = smk_of_current();
4148 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4151 ssp = sk->sk_security;
4154 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4158 * smack_inet_conn_request - Smack access check on connect
4159 * @sk: socket involved
4163 * Returns 0 if a task with the packet label could write to
4164 * the socket, otherwise an error code
4166 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4167 struct request_sock *req)
4169 u16 family = sk->sk_family;
4170 struct smack_known *skp;
4171 struct socket_smack *ssp = sk->sk_security;
4172 struct netlbl_lsm_secattr secattr;
4173 struct sockaddr_in addr;
4175 struct smack_known *hskp;
4177 struct smk_audit_info ad;
4179 struct lsm_network_audit net;
4182 #if IS_ENABLED(CONFIG_IPV6)
4183 if (family == PF_INET6) {
4185 * Handle mapped IPv4 packets arriving
4186 * via IPv6 sockets. Don't set up netlabel
4187 * processing on IPv6.
4189 if (skb->protocol == htons(ETH_P_IP))
4194 #endif /* CONFIG_IPV6 */
4196 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4198 * If there is a secmark use it rather than the CIPSO label.
4199 * If there is no secmark fall back to CIPSO.
4200 * The secmark is assumed to reflect policy better.
4202 if (skb && skb->secmark != 0) {
4203 skp = smack_from_secid(skb->secmark);
4206 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4208 netlbl_secattr_init(&secattr);
4209 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4211 skp = smack_from_secattr(&secattr, ssp);
4213 skp = &smack_known_huh;
4214 netlbl_secattr_destroy(&secattr);
4216 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4221 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4222 ad.a.u.net->family = family;
4223 ad.a.u.net->netif = skb->skb_iif;
4224 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4227 * Receiving a packet requires that the other end be able to write
4228 * here. Read access is not required.
4230 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4231 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4236 * Save the peer's label in the request_sock so we can later setup
4237 * smk_packet in the child socket so that SO_PEERCRED can report it.
4239 req->peer_secid = skp->smk_secid;
4242 * We need to decide if we want to label the incoming connection here
4243 * if we do we only need to label the request_sock and the stack will
4244 * propagate the wire-label to the sock when it is created.
4247 addr.sin_addr.s_addr = hdr->saddr;
4249 hskp = smack_ipv4host_label(&addr);
4253 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4255 netlbl_req_delattr(req);
4261 * smack_inet_csk_clone - Copy the connection information to the new socket
4262 * @sk: the new socket
4263 * @req: the connection's request_sock
4265 * Transfer the connection's peer label to the newly created socket.
4267 static void smack_inet_csk_clone(struct sock *sk,
4268 const struct request_sock *req)
4270 struct socket_smack *ssp = sk->sk_security;
4271 struct smack_known *skp;
4273 if (req->peer_secid != 0) {
4274 skp = smack_from_secid(req->peer_secid);
4275 ssp->smk_packet = skp;
4277 ssp->smk_packet = NULL;
4281 * Key management security hooks
4283 * Casey has not tested key support very heavily.
4284 * The permission check is most likely too restrictive.
4285 * If you care about keys please have a look.
4290 * smack_key_alloc - Set the key security blob
4292 * @cred: the credentials to use
4295 * No allocation required
4299 static int smack_key_alloc(struct key *key, const struct cred *cred,
4300 unsigned long flags)
4302 struct smack_known *skp = smk_of_task(cred->security);
4304 key->security = skp;
4309 * smack_key_free - Clear the key security blob
4312 * Clear the blob pointer
4314 static void smack_key_free(struct key *key)
4316 key->security = NULL;
4320 * smack_key_permission - Smack access on a key
4321 * @key_ref: gets to the object
4322 * @cred: the credentials to use
4323 * @perm: requested key permissions
4325 * Return 0 if the task has read and write to the object,
4326 * an error code otherwise
4328 static int smack_key_permission(key_ref_t key_ref,
4329 const struct cred *cred, unsigned perm)
4332 struct smk_audit_info ad;
4333 struct smack_known *tkp = smk_of_task(cred->security);
4337 keyp = key_ref_to_ptr(key_ref);
4341 * If the key hasn't been initialized give it access so that
4344 if (keyp->security == NULL)
4347 * This should not occur
4352 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4353 ad.a.u.key_struct.key = keyp->serial;
4354 ad.a.u.key_struct.key_desc = keyp->description;
4356 if (perm & KEY_NEED_READ)
4358 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4359 request = MAY_WRITE;
4360 rc = smk_access(tkp, keyp->security, request, &ad);
4361 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4366 * smack_key_getsecurity - Smack label tagging the key
4367 * @key points to the key to be queried
4368 * @_buffer points to a pointer that should be set to point to the
4369 * resulting string (if no label or an error occurs).
4370 * Return the length of the string (including terminating NUL) or -ve if
4372 * May also return 0 (and a NULL buffer pointer) if there is no label.
4374 static int smack_key_getsecurity(struct key *key, char **_buffer)
4376 struct smack_known *skp = key->security;
4380 if (key->security == NULL) {
4385 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4388 length = strlen(copy) + 1;
4394 #endif /* CONFIG_KEYS */
4399 * Audit requires a unique representation of each Smack specific
4400 * rule. This unique representation is used to distinguish the
4401 * object to be audited from remaining kernel objects and also
4402 * works as a glue between the audit hooks.
4404 * Since repository entries are added but never deleted, we'll use
4405 * the smack_known label address related to the given audit rule as
4406 * the needed unique representation. This also better fits the smack
4407 * model where nearly everything is a label.
4412 * smack_audit_rule_init - Initialize a smack audit rule
4413 * @field: audit rule fields given from user-space (audit.h)
4414 * @op: required testing operator (=, !=, >, <, ...)
4415 * @rulestr: smack label to be audited
4416 * @vrule: pointer to save our own audit rule representation
4418 * Prepare to audit cases where (@field @op @rulestr) is true.
4419 * The label to be audited is created if necessay.
4421 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4423 struct smack_known *skp;
4424 char **rule = (char **)vrule;
4427 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4430 if (op != Audit_equal && op != Audit_not_equal)
4433 skp = smk_import_entry(rulestr, 0);
4435 return PTR_ERR(skp);
4437 *rule = skp->smk_known;
4443 * smack_audit_rule_known - Distinguish Smack audit rules
4444 * @krule: rule of interest, in Audit kernel representation format
4446 * This is used to filter Smack rules from remaining Audit ones.
4447 * If it's proved that this rule belongs to us, the
4448 * audit_rule_match hook will be called to do the final judgement.
4450 static int smack_audit_rule_known(struct audit_krule *krule)
4452 struct audit_field *f;
4455 for (i = 0; i < krule->field_count; i++) {
4456 f = &krule->fields[i];
4458 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4466 * smack_audit_rule_match - Audit given object ?
4467 * @secid: security id for identifying the object to test
4468 * @field: audit rule flags given from user-space
4469 * @op: required testing operator
4470 * @vrule: smack internal rule presentation
4471 * @actx: audit context associated with the check
4473 * The core Audit hook. It's used to take the decision of
4474 * whether to audit or not to audit a given object.
4476 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4477 struct audit_context *actx)
4479 struct smack_known *skp;
4482 if (unlikely(!rule)) {
4483 WARN_ONCE(1, "Smack: missing rule\n");
4487 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4490 skp = smack_from_secid(secid);
4493 * No need to do string comparisons. If a match occurs,
4494 * both pointers will point to the same smack_known
4497 if (op == Audit_equal)
4498 return (rule == skp->smk_known);
4499 if (op == Audit_not_equal)
4500 return (rule != skp->smk_known);
4506 * There is no need for a smack_audit_rule_free hook.
4507 * No memory was allocated.
4510 #endif /* CONFIG_AUDIT */
4513 * smack_ismaclabel - check if xattr @name references a smack MAC label
4514 * @name: Full xattr name to check.
4516 static int smack_ismaclabel(const char *name)
4518 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4523 * smack_secid_to_secctx - return the smack label for a secid
4524 * @secid: incoming integer
4525 * @secdata: destination
4526 * @seclen: how long it is
4528 * Exists for networking code.
4530 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4532 struct smack_known *skp = smack_from_secid(secid);
4535 *secdata = skp->smk_known;
4536 *seclen = strlen(skp->smk_known);
4541 * smack_secctx_to_secid - return the secid for a smack label
4542 * @secdata: smack label
4543 * @seclen: how long result is
4544 * @secid: outgoing integer
4546 * Exists for audit and networking code.
4548 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4550 struct smack_known *skp = smk_find_entry(secdata);
4553 *secid = skp->smk_secid;
4560 * There used to be a smack_release_secctx hook
4561 * that did nothing back when hooks were in a vector.
4562 * Now that there's a list such a hook adds cost.
4565 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4567 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4570 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4572 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4575 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4578 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4586 static struct security_hook_list smack_hooks[] = {
4587 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4588 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4589 LSM_HOOK_INIT(syslog, smack_syslog),
4591 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4592 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4593 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4594 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4595 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4596 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4597 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4599 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4600 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4601 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4603 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4604 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4605 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4606 LSM_HOOK_INIT(inode_link, smack_inode_link),
4607 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4608 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4609 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4610 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4611 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4612 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4613 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4614 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4615 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4616 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4617 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4618 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4619 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4620 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4622 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4623 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4624 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4625 LSM_HOOK_INIT(file_lock, smack_file_lock),
4626 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4627 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4628 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4629 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4630 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4631 LSM_HOOK_INIT(file_receive, smack_file_receive),
4633 LSM_HOOK_INIT(file_open, smack_file_open),
4635 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4636 LSM_HOOK_INIT(cred_free, smack_cred_free),
4637 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4638 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4639 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4640 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4641 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4642 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4643 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4644 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4645 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4646 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4647 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4648 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4649 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4650 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4651 LSM_HOOK_INIT(task_kill, smack_task_kill),
4652 LSM_HOOK_INIT(task_wait, smack_task_wait),
4653 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4655 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4656 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4658 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4659 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4661 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4662 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4663 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4664 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4665 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4666 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4668 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4669 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4670 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4671 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4672 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4674 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4675 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4676 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4677 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4678 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4680 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4682 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4683 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4685 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4686 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4688 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4689 #ifdef SMACK_IPV6_PORT_LABELING
4690 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4692 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4693 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4694 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4695 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4696 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4697 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4698 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4699 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4700 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4701 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4703 /* key management security hooks */
4705 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4706 LSM_HOOK_INIT(key_free, smack_key_free),
4707 LSM_HOOK_INIT(key_permission, smack_key_permission),
4708 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4709 #endif /* CONFIG_KEYS */
4713 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4714 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4715 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4716 #endif /* CONFIG_AUDIT */
4718 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4719 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4720 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4721 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4722 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4723 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4727 static __init void init_smack_known_list(void)
4730 * Initialize rule list locks
4732 mutex_init(&smack_known_huh.smk_rules_lock);
4733 mutex_init(&smack_known_hat.smk_rules_lock);
4734 mutex_init(&smack_known_floor.smk_rules_lock);
4735 mutex_init(&smack_known_star.smk_rules_lock);
4736 mutex_init(&smack_known_invalid.smk_rules_lock);
4737 mutex_init(&smack_known_web.smk_rules_lock);
4739 * Initialize rule lists
4741 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4742 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4743 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4744 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4745 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4746 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4748 * Create the known labels list
4750 smk_insert_entry(&smack_known_huh);
4751 smk_insert_entry(&smack_known_hat);
4752 smk_insert_entry(&smack_known_star);
4753 smk_insert_entry(&smack_known_floor);
4754 smk_insert_entry(&smack_known_invalid);
4755 smk_insert_entry(&smack_known_web);
4759 * smack_init - initialize the smack system
4763 static __init int smack_init(void)
4766 struct task_smack *tsp;
4768 if (!security_module_enable("smack"))
4771 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4772 if (!smack_inode_cache)
4775 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4778 kmem_cache_destroy(smack_inode_cache);
4784 pr_info("Smack: Initializing.\n");
4785 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4786 pr_info("Smack: Netfilter enabled.\n");
4788 #ifdef SMACK_IPV6_PORT_LABELING
4789 pr_info("Smack: IPv6 port labeling enabled.\n");
4791 #ifdef SMACK_IPV6_SECMARK_LABELING
4792 pr_info("Smack: IPv6 Netfilter enabled.\n");
4796 * Set the security state for the initial task.
4798 cred = (struct cred *) current->cred;
4799 cred->security = tsp;
4801 /* initialize the smack_known_list */
4802 init_smack_known_list();
4807 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks));
4813 * Smack requires early initialization in order to label
4814 * all processes and objects when they are created.
4816 security_initcall(smack_init);