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_NOFS);
273 return ERR_PTR(-ENOMEM);
275 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
281 skp = smk_import_entry(buffer, rc);
289 * new_inode_smack - allocate an inode security blob
290 * @skp: a pointer to the Smack label entry to use in the blob
292 * Returns the new blob or NULL if there's no memory available
294 static struct inode_smack *new_inode_smack(struct smack_known *skp)
296 struct inode_smack *isp;
298 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
302 isp->smk_inode = skp;
304 mutex_init(&isp->smk_lock);
310 * new_task_smack - allocate a task security blob
311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
315 * Returns the new blob or NULL if there's no memory available
317 static struct task_smack *new_task_smack(struct smack_known *task,
318 struct smack_known *forked, gfp_t gfp)
320 struct task_smack *tsp;
322 tsp = kzalloc(sizeof(struct task_smack), gfp);
326 tsp->smk_task = task;
327 tsp->smk_forked = forked;
328 INIT_LIST_HEAD(&tsp->smk_rules);
329 INIT_LIST_HEAD(&tsp->smk_relabel);
330 mutex_init(&tsp->smk_rules_lock);
336 * smk_copy_rules - copy a rule set
337 * @nhead: new rules header pointer
338 * @ohead: old rules header pointer
339 * @gfp: type of the memory for the allocation
341 * Returns 0 on success, -ENOMEM on error
343 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
346 struct smack_rule *nrp;
347 struct smack_rule *orp;
350 INIT_LIST_HEAD(nhead);
352 list_for_each_entry_rcu(orp, ohead, list) {
353 nrp = kzalloc(sizeof(struct smack_rule), gfp);
359 list_add_rcu(&nrp->list, nhead);
365 * smk_copy_relabel - copy smk_relabel labels list
366 * @nhead: new rules header pointer
367 * @ohead: old rules header pointer
368 * @gfp: type of the memory for the allocation
370 * Returns 0 on success, -ENOMEM on error
372 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
375 struct smack_known_list_elem *nklep;
376 struct smack_known_list_elem *oklep;
378 INIT_LIST_HEAD(nhead);
380 list_for_each_entry(oklep, ohead, list) {
381 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
383 smk_destroy_label_list(nhead);
386 nklep->smk_label = oklep->smk_label;
387 list_add(&nklep->list, nhead);
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode - input mode in form of PTRACE_MODE_*
397 * Returns a converted MAY_* mode usable by smack rules
399 static inline unsigned int smk_ptrace_mode(unsigned int mode)
401 if (mode & PTRACE_MODE_ATTACH)
402 return MAY_READWRITE;
403 if (mode & PTRACE_MODE_READ)
410 * smk_ptrace_rule_check - helper for ptrace access
411 * @tracer: tracer process
412 * @tracee_known: label entry of the process that's about to be traced
413 * @mode: ptrace attachment mode (PTRACE_MODE_*)
414 * @func: name of the function that called us, used for audit
416 * Returns 0 on access granted, -error on error
418 static int smk_ptrace_rule_check(struct task_struct *tracer,
419 struct smack_known *tracee_known,
420 unsigned int mode, const char *func)
423 struct smk_audit_info ad, *saip = NULL;
424 struct task_smack *tsp;
425 struct smack_known *tracer_known;
427 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
428 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
429 smk_ad_setfield_u_tsk(&ad, tracer);
434 tsp = __task_cred(tracer)->security;
435 tracer_known = smk_of_task(tsp);
437 if ((mode & PTRACE_MODE_ATTACH) &&
438 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
439 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
440 if (tracer_known->smk_known == tracee_known->smk_known)
442 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
444 else if (capable(CAP_SYS_PTRACE))
450 smack_log(tracer_known->smk_known,
451 tracee_known->smk_known,
458 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
459 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
467 * We he, that is fun!
471 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
472 * @ctp: child task pointer
473 * @mode: ptrace attachment mode (PTRACE_MODE_*)
475 * Returns 0 if access is OK, an error code otherwise
477 * Do the capability checks.
479 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
481 struct smack_known *skp;
483 skp = smk_of_task_struct(ctp);
485 return smk_ptrace_rule_check(current, skp, mode, __func__);
489 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
490 * @ptp: parent task pointer
492 * Returns 0 if access is OK, an error code otherwise
494 * Do the capability checks, and require PTRACE_MODE_ATTACH.
496 static int smack_ptrace_traceme(struct task_struct *ptp)
499 struct smack_known *skp;
501 skp = smk_of_task(current_security());
503 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
508 * smack_syslog - Smack approval on syslog
509 * @type: message type
511 * Returns 0 on success, error code otherwise.
513 static int smack_syslog(int typefrom_file)
516 struct smack_known *skp = smk_of_current();
518 if (smack_privileged(CAP_MAC_OVERRIDE))
521 if (smack_syslog_label != NULL && smack_syslog_label != skp)
533 * smack_sb_alloc_security - allocate a superblock blob
534 * @sb: the superblock getting the blob
536 * Returns 0 on success or -ENOMEM on error.
538 static int smack_sb_alloc_security(struct super_block *sb)
540 struct superblock_smack *sbsp;
542 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
547 sbsp->smk_root = &smack_known_floor;
548 sbsp->smk_default = &smack_known_floor;
549 sbsp->smk_floor = &smack_known_floor;
550 sbsp->smk_hat = &smack_known_hat;
552 * smk_initialized will be zero from kzalloc.
554 sb->s_security = sbsp;
560 * smack_sb_free_security - free a superblock blob
561 * @sb: the superblock getting the blob
564 static void smack_sb_free_security(struct super_block *sb)
566 kfree(sb->s_security);
567 sb->s_security = NULL;
571 * smack_sb_copy_data - copy mount options data for processing
572 * @orig: where to start
573 * @smackopts: mount options string
575 * Returns 0 on success or -ENOMEM on error.
577 * Copy the Smack specific mount options out of the mount
580 static int smack_sb_copy_data(char *orig, char *smackopts)
582 char *cp, *commap, *otheropts, *dp;
584 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
585 if (otheropts == NULL)
588 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
589 if (strstr(cp, SMK_FSDEFAULT) == cp)
591 else if (strstr(cp, SMK_FSFLOOR) == cp)
593 else if (strstr(cp, SMK_FSHAT) == cp)
595 else if (strstr(cp, SMK_FSROOT) == cp)
597 else if (strstr(cp, SMK_FSTRANS) == cp)
602 commap = strchr(cp, ',');
611 strcpy(orig, otheropts);
612 free_page((unsigned long)otheropts);
618 * smack_parse_opts_str - parse Smack specific mount options
619 * @options: mount options string
620 * @opts: where to store converted mount opts
622 * Returns 0 on success or -ENOMEM on error.
624 * converts Smack specific mount options to generic security option format
626 static int smack_parse_opts_str(char *options,
627 struct security_mnt_opts *opts)
630 char *fsdefault = NULL;
631 char *fsfloor = NULL;
634 char *fstransmute = NULL;
636 int num_mnt_opts = 0;
639 opts->num_mnt_opts = 0;
644 while ((p = strsep(&options, ",")) != NULL) {
645 substring_t args[MAX_OPT_ARGS];
650 token = match_token(p, smk_mount_tokens, args);
656 fsdefault = match_strdup(&args[0]);
663 fsfloor = match_strdup(&args[0]);
670 fshat = match_strdup(&args[0]);
677 fsroot = match_strdup(&args[0]);
681 case Opt_fstransmute:
684 fstransmute = match_strdup(&args[0]);
690 pr_warn("Smack: unknown mount option\n");
695 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
699 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
701 if (!opts->mnt_opts_flags) {
702 kfree(opts->mnt_opts);
707 opts->mnt_opts[num_mnt_opts] = fsdefault;
708 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
711 opts->mnt_opts[num_mnt_opts] = fsfloor;
712 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
715 opts->mnt_opts[num_mnt_opts] = fshat;
716 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
719 opts->mnt_opts[num_mnt_opts] = fsroot;
720 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
723 opts->mnt_opts[num_mnt_opts] = fstransmute;
724 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
727 opts->num_mnt_opts = num_mnt_opts;
732 pr_warn("Smack: duplicate mount options\n");
744 * smack_set_mnt_opts - set Smack specific mount options
745 * @sb: the file system superblock
746 * @opts: Smack mount options
747 * @kern_flags: mount option from kernel space or user space
748 * @set_kern_flags: where to store converted mount opts
750 * Returns 0 on success, an error code on failure
752 * Allow filesystems with binary mount data to explicitly set Smack mount
755 static int smack_set_mnt_opts(struct super_block *sb,
756 struct security_mnt_opts *opts,
757 unsigned long kern_flags,
758 unsigned long *set_kern_flags)
760 struct dentry *root = sb->s_root;
761 struct inode *inode = d_backing_inode(root);
762 struct superblock_smack *sp = sb->s_security;
763 struct inode_smack *isp;
764 struct smack_known *skp;
766 int num_opts = opts->num_mnt_opts;
769 if (sp->smk_initialized)
772 sp->smk_initialized = 1;
774 for (i = 0; i < num_opts; i++) {
775 switch (opts->mnt_opts_flags[i]) {
777 skp = smk_import_entry(opts->mnt_opts[i], 0);
780 sp->smk_default = skp;
783 skp = smk_import_entry(opts->mnt_opts[i], 0);
789 skp = smk_import_entry(opts->mnt_opts[i], 0);
795 skp = smk_import_entry(opts->mnt_opts[i], 0);
801 skp = smk_import_entry(opts->mnt_opts[i], 0);
812 if (!smack_privileged(CAP_MAC_ADMIN)) {
814 * Unprivileged mounts don't get to specify Smack values.
819 * Unprivileged mounts get root and default from the caller.
821 skp = smk_of_current();
823 sp->smk_default = skp;
827 * Initialize the root inode.
829 isp = inode->i_security;
831 isp = new_inode_smack(sp->smk_root);
834 inode->i_security = isp;
836 isp->smk_inode = sp->smk_root;
839 isp->smk_flags |= SMK_INODE_TRANSMUTE;
845 * smack_sb_kern_mount - Smack specific mount processing
846 * @sb: the file system superblock
847 * @flags: the mount flags
848 * @data: the smack mount options
850 * Returns 0 on success, an error code on failure
852 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
855 char *options = data;
856 struct security_mnt_opts opts;
858 security_init_mnt_opts(&opts);
863 rc = smack_parse_opts_str(options, &opts);
868 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
871 security_free_mnt_opts(&opts);
876 * smack_sb_statfs - Smack check on statfs
877 * @dentry: identifies the file system in question
879 * Returns 0 if current can read the floor of the filesystem,
880 * and error code otherwise
882 static int smack_sb_statfs(struct dentry *dentry)
884 struct superblock_smack *sbp = dentry->d_sb->s_security;
886 struct smk_audit_info ad;
888 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
889 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
891 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
892 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
901 * smack_bprm_set_creds - set creds for exec
902 * @bprm: the exec information
904 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
906 static int smack_bprm_set_creds(struct linux_binprm *bprm)
908 struct inode *inode = file_inode(bprm->file);
909 struct task_smack *bsp = bprm->cred->security;
910 struct inode_smack *isp;
913 if (bprm->cred_prepared)
916 isp = inode->i_security;
917 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
920 if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
921 struct task_struct *tracer;
925 tracer = ptrace_parent(current);
926 if (likely(tracer != NULL))
927 rc = smk_ptrace_rule_check(tracer,
936 if (bprm->unsafe & ~LSM_UNSAFE_PTRACE)
939 bsp->smk_task = isp->smk_task;
940 bprm->per_clear |= PER_CLEAR_ON_SETID;
946 * smack_bprm_committing_creds - Prepare to install the new credentials
949 * @bprm: binprm for exec
951 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
953 struct task_smack *bsp = bprm->cred->security;
955 if (bsp->smk_task != bsp->smk_forked)
956 current->pdeath_signal = 0;
960 * smack_bprm_secureexec - Return the decision to use secureexec.
961 * @bprm: binprm for exec
963 * Returns 0 on success.
965 static int smack_bprm_secureexec(struct linux_binprm *bprm)
967 struct task_smack *tsp = current_security();
969 if (tsp->smk_task != tsp->smk_forked)
980 * smack_inode_alloc_security - allocate an inode blob
981 * @inode: the inode in need of a blob
983 * Returns 0 if it gets a blob, -ENOMEM otherwise
985 static int smack_inode_alloc_security(struct inode *inode)
987 struct smack_known *skp = smk_of_current();
989 inode->i_security = new_inode_smack(skp);
990 if (inode->i_security == NULL)
996 * smack_inode_free_security - free an inode blob
997 * @inode: the inode with a blob
999 * Clears the blob pointer in inode
1001 static void smack_inode_free_security(struct inode *inode)
1003 kmem_cache_free(smack_inode_cache, inode->i_security);
1004 inode->i_security = NULL;
1008 * smack_inode_init_security - copy out the smack from an inode
1009 * @inode: the newly created inode
1010 * @dir: containing directory object
1012 * @name: where to put the attribute name
1013 * @value: where to put the attribute value
1014 * @len: where to put the length of the attribute
1016 * Returns 0 if it all works out, -ENOMEM if there's no memory
1018 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1019 const struct qstr *qstr, const char **name,
1020 void **value, size_t *len)
1022 struct inode_smack *issp = inode->i_security;
1023 struct smack_known *skp = smk_of_current();
1024 struct smack_known *isp = smk_of_inode(inode);
1025 struct smack_known *dsp = smk_of_inode(dir);
1029 *name = XATTR_SMACK_SUFFIX;
1033 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1038 * If the access rule allows transmutation and
1039 * the directory requests transmutation then
1040 * by all means transmute.
1041 * Mark the inode as changed.
1043 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1044 smk_inode_transmutable(dir)) {
1046 issp->smk_flags |= SMK_INODE_CHANGED;
1049 *value = kstrdup(isp->smk_known, GFP_NOFS);
1053 *len = strlen(isp->smk_known);
1060 * smack_inode_link - Smack check on link
1061 * @old_dentry: the existing object
1063 * @new_dentry: the new object
1065 * Returns 0 if access is permitted, an error code otherwise
1067 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1068 struct dentry *new_dentry)
1070 struct smack_known *isp;
1071 struct smk_audit_info ad;
1074 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1075 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1077 isp = smk_of_inode(d_backing_inode(old_dentry));
1078 rc = smk_curacc(isp, MAY_WRITE, &ad);
1079 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1081 if (rc == 0 && d_is_positive(new_dentry)) {
1082 isp = smk_of_inode(d_backing_inode(new_dentry));
1083 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1084 rc = smk_curacc(isp, MAY_WRITE, &ad);
1085 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1092 * smack_inode_unlink - Smack check on inode deletion
1093 * @dir: containing directory object
1094 * @dentry: file to unlink
1096 * Returns 0 if current can write the containing directory
1097 * and the object, error code otherwise
1099 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1101 struct inode *ip = d_backing_inode(dentry);
1102 struct smk_audit_info ad;
1105 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1106 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1109 * You need write access to the thing you're unlinking
1111 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1112 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1115 * You also need write access to the containing directory
1117 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1118 smk_ad_setfield_u_fs_inode(&ad, dir);
1119 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1120 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1126 * smack_inode_rmdir - Smack check on directory deletion
1127 * @dir: containing directory object
1128 * @dentry: directory to unlink
1130 * Returns 0 if current can write the containing directory
1131 * and the directory, error code otherwise
1133 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1135 struct smk_audit_info ad;
1138 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1139 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1142 * You need write access to the thing you're removing
1144 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1145 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1148 * You also need write access to the containing directory
1150 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1151 smk_ad_setfield_u_fs_inode(&ad, dir);
1152 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1153 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1160 * smack_inode_rename - Smack check on rename
1161 * @old_inode: unused
1162 * @old_dentry: the old object
1163 * @new_inode: unused
1164 * @new_dentry: the new object
1166 * Read and write access is required on both the old and
1169 * Returns 0 if access is permitted, an error code otherwise
1171 static int smack_inode_rename(struct inode *old_inode,
1172 struct dentry *old_dentry,
1173 struct inode *new_inode,
1174 struct dentry *new_dentry)
1177 struct smack_known *isp;
1178 struct smk_audit_info ad;
1180 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1181 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1183 isp = smk_of_inode(d_backing_inode(old_dentry));
1184 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1185 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1187 if (rc == 0 && d_is_positive(new_dentry)) {
1188 isp = smk_of_inode(d_backing_inode(new_dentry));
1189 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1190 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1191 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1197 * smack_inode_permission - Smack version of permission()
1198 * @inode: the inode in question
1199 * @mask: the access requested
1201 * This is the important Smack hook.
1203 * Returns 0 if access is permitted, -EACCES otherwise
1205 static int smack_inode_permission(struct inode *inode, int mask)
1207 struct smk_audit_info ad;
1208 int no_block = mask & MAY_NOT_BLOCK;
1211 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1213 * No permission to check. Existence test. Yup, it's there.
1218 /* May be droppable after audit */
1221 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1222 smk_ad_setfield_u_fs_inode(&ad, inode);
1223 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1224 rc = smk_bu_inode(inode, mask, rc);
1229 * smack_inode_setattr - Smack check for setting attributes
1230 * @dentry: the object
1231 * @iattr: for the force flag
1233 * Returns 0 if access is permitted, an error code otherwise
1235 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1237 struct smk_audit_info ad;
1241 * Need to allow for clearing the setuid bit.
1243 if (iattr->ia_valid & ATTR_FORCE)
1245 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1246 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1248 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1249 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1254 * smack_inode_getattr - Smack check for getting attributes
1255 * @mnt: vfsmount of the object
1256 * @dentry: the object
1258 * Returns 0 if access is permitted, an error code otherwise
1260 static int smack_inode_getattr(const struct path *path)
1262 struct smk_audit_info ad;
1263 struct inode *inode = d_backing_inode(path->dentry);
1266 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1267 smk_ad_setfield_u_fs_path(&ad, *path);
1268 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1269 rc = smk_bu_inode(inode, MAY_READ, rc);
1274 * smack_inode_setxattr - Smack check for setting xattrs
1275 * @dentry: the object
1276 * @name: name of the attribute
1277 * @value: value of the attribute
1278 * @size: size of the value
1281 * This protects the Smack attribute explicitly.
1283 * Returns 0 if access is permitted, an error code otherwise
1285 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1286 const void *value, size_t size, int flags)
1288 struct smk_audit_info ad;
1289 struct smack_known *skp;
1291 int check_import = 0;
1296 * Check label validity here so import won't fail in post_setxattr
1298 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1299 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1300 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1303 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1304 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1308 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1310 if (size != TRANS_TRUE_SIZE ||
1311 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1314 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1316 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1319 if (rc == 0 && check_import) {
1320 skp = size ? smk_import_entry(value, size) : NULL;
1323 else if (skp == NULL || (check_star &&
1324 (skp == &smack_known_star || skp == &smack_known_web)))
1328 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1329 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1332 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1333 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1340 * smack_inode_post_setxattr - Apply the Smack update approved above
1342 * @name: attribute name
1343 * @value: attribute value
1344 * @size: attribute size
1347 * Set the pointer in the inode blob to the entry found
1348 * in the master label list.
1350 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1351 const void *value, size_t size, int flags)
1353 struct smack_known *skp;
1354 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1356 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1357 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1361 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1362 skp = smk_import_entry(value, size);
1364 isp->smk_inode = skp;
1366 isp->smk_inode = &smack_known_invalid;
1367 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1368 skp = smk_import_entry(value, size);
1370 isp->smk_task = skp;
1372 isp->smk_task = &smack_known_invalid;
1373 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1374 skp = smk_import_entry(value, size);
1376 isp->smk_mmap = skp;
1378 isp->smk_mmap = &smack_known_invalid;
1385 * smack_inode_getxattr - Smack check on getxattr
1386 * @dentry: the object
1389 * Returns 0 if access is permitted, an error code otherwise
1391 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1393 struct smk_audit_info ad;
1396 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1397 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1399 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1400 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1405 * smack_inode_removexattr - Smack check on removexattr
1406 * @dentry: the object
1407 * @name: name of the attribute
1409 * Removing the Smack attribute requires CAP_MAC_ADMIN
1411 * Returns 0 if access is permitted, an error code otherwise
1413 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1415 struct inode_smack *isp;
1416 struct smk_audit_info ad;
1419 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1420 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1421 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1422 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1423 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1424 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1425 if (!smack_privileged(CAP_MAC_ADMIN))
1428 rc = cap_inode_removexattr(dentry, name);
1433 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1434 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1436 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1437 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1441 isp = d_backing_inode(dentry)->i_security;
1443 * Don't do anything special for these.
1444 * XATTR_NAME_SMACKIPIN
1445 * XATTR_NAME_SMACKIPOUT
1446 * XATTR_NAME_SMACKEXEC
1448 if (strcmp(name, XATTR_NAME_SMACK) == 0)
1449 isp->smk_task = NULL;
1450 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1451 isp->smk_mmap = NULL;
1452 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1453 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1459 * smack_inode_getsecurity - get smack xattrs
1460 * @inode: the object
1461 * @name: attribute name
1462 * @buffer: where to put the result
1463 * @alloc: duplicate memory
1465 * Returns the size of the attribute or an error code
1467 static int smack_inode_getsecurity(const struct inode *inode,
1468 const char *name, void **buffer,
1471 struct socket_smack *ssp;
1472 struct socket *sock;
1473 struct super_block *sbp;
1474 struct inode *ip = (struct inode *)inode;
1475 struct smack_known *isp;
1477 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
1478 isp = smk_of_inode(inode);
1481 * The rest of the Smack xattrs are only on sockets.
1484 if (sbp->s_magic != SOCKFS_MAGIC)
1487 sock = SOCKET_I(ip);
1488 if (sock == NULL || sock->sk == NULL)
1491 ssp = sock->sk->sk_security;
1493 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1495 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1502 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1503 if (*buffer == NULL)
1507 return strlen(isp->smk_known);
1512 * smack_inode_listsecurity - list the Smack attributes
1513 * @inode: the object
1514 * @buffer: where they go
1515 * @buffer_size: size of buffer
1517 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1520 int len = sizeof(XATTR_NAME_SMACK);
1522 if (buffer != NULL && len <= buffer_size)
1523 memcpy(buffer, XATTR_NAME_SMACK, len);
1529 * smack_inode_getsecid - Extract inode's security id
1530 * @inode: inode to extract the info from
1531 * @secid: where result will be saved
1533 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1535 struct inode_smack *isp = inode->i_security;
1537 *secid = isp->smk_inode->smk_secid;
1545 * smack_file_permission - Smack check on file operations
1551 * Should access checks be done on each read or write?
1552 * UNICOS and SELinux say yes.
1553 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1555 * I'll say no for now. Smack does not do the frequent
1556 * label changing that SELinux does.
1558 static int smack_file_permission(struct file *file, int mask)
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);
1856 if (unlikely(IS_PRIVATE(inode)))
1859 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1860 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1862 * This code relies on bitmasks.
1864 if (file->f_mode & FMODE_READ)
1866 if (file->f_mode & FMODE_WRITE)
1869 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1870 rc = smk_bu_file(file, may, rc);
1875 * smack_file_open - Smack dentry open processing
1877 * @cred: task credential
1879 * Set the security blob in the file structure.
1880 * Allow the open only if the task has read access. There are
1881 * many read operations (e.g. fstat) that you can do with an
1882 * fd even if you have the file open write-only.
1886 static int smack_file_open(struct file *file, const struct cred *cred)
1888 struct task_smack *tsp = cred->security;
1889 struct inode *inode = file_inode(file);
1890 struct smk_audit_info ad;
1893 if (smack_privileged(CAP_MAC_OVERRIDE))
1896 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1897 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1898 rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
1899 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1909 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1910 * @new: the new credentials
1911 * @gfp: the atomicity of any memory allocations
1913 * Prepare a blank set of credentials for modification. This must allocate all
1914 * the memory the LSM module might require such that cred_transfer() can
1915 * complete without error.
1917 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1919 struct task_smack *tsp;
1921 tsp = new_task_smack(NULL, NULL, gfp);
1925 cred->security = tsp;
1932 * smack_cred_free - "free" task-level security credentials
1933 * @cred: the credentials in question
1936 static void smack_cred_free(struct cred *cred)
1938 struct task_smack *tsp = cred->security;
1939 struct smack_rule *rp;
1940 struct list_head *l;
1941 struct list_head *n;
1945 cred->security = NULL;
1947 smk_destroy_label_list(&tsp->smk_relabel);
1949 list_for_each_safe(l, n, &tsp->smk_rules) {
1950 rp = list_entry(l, struct smack_rule, list);
1951 list_del(&rp->list);
1958 * smack_cred_prepare - prepare new set of credentials for modification
1959 * @new: the new credentials
1960 * @old: the original credentials
1961 * @gfp: the atomicity of any memory allocations
1963 * Prepare a new set of credentials for modification.
1965 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1968 struct task_smack *old_tsp = old->security;
1969 struct task_smack *new_tsp;
1972 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1973 if (new_tsp == NULL)
1976 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1980 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
1985 new->security = new_tsp;
1990 * smack_cred_transfer - Transfer the old credentials to the new credentials
1991 * @new: the new credentials
1992 * @old: the original credentials
1994 * Fill in a set of blank credentials from another set of credentials.
1996 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1998 struct task_smack *old_tsp = old->security;
1999 struct task_smack *new_tsp = new->security;
2001 new_tsp->smk_task = old_tsp->smk_task;
2002 new_tsp->smk_forked = old_tsp->smk_task;
2003 mutex_init(&new_tsp->smk_rules_lock);
2004 INIT_LIST_HEAD(&new_tsp->smk_rules);
2007 /* cbs copy rule list */
2011 * smack_kernel_act_as - Set the subjective context in a set of credentials
2012 * @new: points to the set of credentials to be modified.
2013 * @secid: specifies the security ID to be set
2015 * Set the security data for a kernel service.
2017 static int smack_kernel_act_as(struct cred *new, u32 secid)
2019 struct task_smack *new_tsp = new->security;
2020 struct smack_known *skp = smack_from_secid(secid);
2025 new_tsp->smk_task = skp;
2030 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2031 * @new: points to the set of credentials to be modified
2032 * @inode: points to the inode to use as a reference
2034 * Set the file creation context in a set of credentials to the same
2035 * as the objective context of the specified inode
2037 static int smack_kernel_create_files_as(struct cred *new,
2038 struct inode *inode)
2040 struct inode_smack *isp = inode->i_security;
2041 struct task_smack *tsp = new->security;
2043 tsp->smk_forked = isp->smk_inode;
2044 tsp->smk_task = tsp->smk_forked;
2049 * smk_curacc_on_task - helper to log task related access
2050 * @p: the task object
2051 * @access: the access requested
2052 * @caller: name of the calling function for audit
2054 * Return 0 if access is permitted
2056 static int smk_curacc_on_task(struct task_struct *p, int access,
2059 struct smk_audit_info ad;
2060 struct smack_known *skp = smk_of_task_struct(p);
2063 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2064 smk_ad_setfield_u_tsk(&ad, p);
2065 rc = smk_curacc(skp, access, &ad);
2066 rc = smk_bu_task(p, access, rc);
2071 * smack_task_setpgid - Smack check on setting pgid
2072 * @p: the task object
2075 * Return 0 if write access is permitted
2077 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2079 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2083 * smack_task_getpgid - Smack access check for getpgid
2084 * @p: the object task
2086 * Returns 0 if current can read the object task, error code otherwise
2088 static int smack_task_getpgid(struct task_struct *p)
2090 return smk_curacc_on_task(p, MAY_READ, __func__);
2094 * smack_task_getsid - Smack access check for getsid
2095 * @p: the object task
2097 * Returns 0 if current can read the object task, error code otherwise
2099 static int smack_task_getsid(struct task_struct *p)
2101 return smk_curacc_on_task(p, MAY_READ, __func__);
2105 * smack_task_getsecid - get the secid of the task
2106 * @p: the object task
2107 * @secid: where to put the result
2109 * Sets the secid to contain a u32 version of the smack label.
2111 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2113 struct smack_known *skp = smk_of_task_struct(p);
2115 *secid = skp->smk_secid;
2119 * smack_task_setnice - Smack check on setting nice
2120 * @p: the task object
2123 * Return 0 if write access is permitted
2125 static int smack_task_setnice(struct task_struct *p, int nice)
2127 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2131 * smack_task_setioprio - Smack check on setting ioprio
2132 * @p: the task object
2135 * Return 0 if write access is permitted
2137 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2139 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2143 * smack_task_getioprio - Smack check on reading ioprio
2144 * @p: the task object
2146 * Return 0 if read access is permitted
2148 static int smack_task_getioprio(struct task_struct *p)
2150 return smk_curacc_on_task(p, MAY_READ, __func__);
2154 * smack_task_setscheduler - Smack check on setting scheduler
2155 * @p: the task object
2159 * Return 0 if read access is permitted
2161 static int smack_task_setscheduler(struct task_struct *p)
2163 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2167 * smack_task_getscheduler - Smack check on reading scheduler
2168 * @p: the task object
2170 * Return 0 if read access is permitted
2172 static int smack_task_getscheduler(struct task_struct *p)
2174 return smk_curacc_on_task(p, MAY_READ, __func__);
2178 * smack_task_movememory - Smack check on moving memory
2179 * @p: the task object
2181 * Return 0 if write access is permitted
2183 static int smack_task_movememory(struct task_struct *p)
2185 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2189 * smack_task_kill - Smack check on signal delivery
2190 * @p: the task object
2193 * @secid: identifies the smack to use in lieu of current's
2195 * Return 0 if write access is permitted
2197 * The secid behavior is an artifact of an SELinux hack
2198 * in the USB code. Someday it may go away.
2200 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2203 struct smk_audit_info ad;
2204 struct smack_known *skp;
2205 struct smack_known *tkp = smk_of_task_struct(p);
2208 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2209 smk_ad_setfield_u_tsk(&ad, p);
2211 * Sending a signal requires that the sender
2212 * can write the receiver.
2215 rc = smk_curacc(tkp, MAY_WRITE, &ad);
2216 rc = smk_bu_task(p, MAY_WRITE, rc);
2220 * If the secid isn't 0 we're dealing with some USB IO
2221 * specific behavior. This is not clean. For one thing
2222 * we can't take privilege into account.
2224 skp = smack_from_secid(secid);
2225 rc = smk_access(skp, tkp, MAY_WRITE, &ad);
2226 rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc);
2231 * smack_task_wait - Smack access check for waiting
2232 * @p: task to wait for
2236 static int smack_task_wait(struct task_struct *p)
2239 * Allow the operation to succeed.
2241 * In userless environments (e.g. phones) programs
2242 * get marked with SMACK64EXEC and even if the parent
2243 * and child shouldn't be talking the parent still
2244 * may expect to know when the child exits.
2250 * smack_task_to_inode - copy task smack into the inode blob
2251 * @p: task to copy from
2252 * @inode: inode to copy to
2254 * Sets the smack pointer in the inode security blob
2256 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2258 struct inode_smack *isp = inode->i_security;
2259 struct smack_known *skp = smk_of_task_struct(p);
2261 isp->smk_inode = skp;
2262 isp->smk_flags |= SMK_INODE_INSTANT;
2270 * smack_sk_alloc_security - Allocate a socket blob
2273 * @gfp_flags: memory allocation flags
2275 * Assign Smack pointers to current
2277 * Returns 0 on success, -ENOMEM is there's no memory
2279 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2281 struct smack_known *skp = smk_of_current();
2282 struct socket_smack *ssp;
2284 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2290 ssp->smk_packet = NULL;
2292 sk->sk_security = ssp;
2298 * smack_sk_free_security - Free a socket blob
2301 * Clears the blob pointer
2303 static void smack_sk_free_security(struct sock *sk)
2305 kfree(sk->sk_security);
2309 * smack_ipv4host_label - check host based restrictions
2310 * @sip: the object end
2312 * looks for host based access restrictions
2314 * This version will only be appropriate for really small sets of single label
2315 * hosts. The caller is responsible for ensuring that the RCU read lock is
2316 * taken before calling this function.
2318 * Returns the label of the far end or NULL if it's not special.
2320 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2322 struct smk_net4addr *snp;
2323 struct in_addr *siap = &sip->sin_addr;
2325 if (siap->s_addr == 0)
2328 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2330 * we break after finding the first match because
2331 * the list is sorted from longest to shortest mask
2332 * so we have found the most specific match
2334 if (snp->smk_host.s_addr ==
2335 (siap->s_addr & snp->smk_mask.s_addr))
2336 return snp->smk_label;
2341 #if IS_ENABLED(CONFIG_IPV6)
2343 * smk_ipv6_localhost - Check for local ipv6 host address
2346 * Returns boolean true if this is the localhost address
2348 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2350 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2351 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2353 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2354 ntohs(be16p[7]) == 1)
2360 * smack_ipv6host_label - check host based restrictions
2361 * @sip: the object end
2363 * looks for host based access restrictions
2365 * This version will only be appropriate for really small sets of single label
2366 * hosts. The caller is responsible for ensuring that the RCU read lock is
2367 * taken before calling this function.
2369 * Returns the label of the far end or NULL if it's not special.
2371 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2373 struct smk_net6addr *snp;
2374 struct in6_addr *sap = &sip->sin6_addr;
2379 * It's local. Don't look for a host label.
2381 if (smk_ipv6_localhost(sip))
2384 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2386 * we break after finding the first match because
2387 * the list is sorted from longest to shortest mask
2388 * so we have found the most specific match
2390 for (found = 1, i = 0; i < 8; i++) {
2392 * If the label is NULL the entry has
2393 * been renounced. Ignore it.
2395 if (snp->smk_label == NULL)
2397 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2398 snp->smk_host.s6_addr16[i]) {
2404 return snp->smk_label;
2409 #endif /* CONFIG_IPV6 */
2412 * smack_netlabel - Set the secattr on a socket
2414 * @labeled: socket label scheme
2416 * Convert the outbound smack value (smk_out) to a
2417 * secattr and attach it to the socket.
2419 * Returns 0 on success or an error code
2421 static int smack_netlabel(struct sock *sk, int labeled)
2423 struct smack_known *skp;
2424 struct socket_smack *ssp = sk->sk_security;
2428 * Usually the netlabel code will handle changing the
2429 * packet labeling based on the label.
2430 * The case of a single label host is different, because
2431 * a single label host should never get a labeled packet
2432 * even though the label is usually associated with a packet
2436 bh_lock_sock_nested(sk);
2438 if (ssp->smk_out == smack_net_ambient ||
2439 labeled == SMACK_UNLABELED_SOCKET)
2440 netlbl_sock_delattr(sk);
2443 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2453 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2455 * @sap: the destination address
2457 * Set the correct secattr for the given socket based on the destination
2458 * address and perform any outbound access checks needed.
2460 * Returns 0 on success or an error code.
2463 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2465 struct smack_known *skp;
2468 struct smack_known *hkp;
2469 struct socket_smack *ssp = sk->sk_security;
2470 struct smk_audit_info ad;
2473 hkp = smack_ipv4host_label(sap);
2476 struct lsm_network_audit net;
2478 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2479 ad.a.u.net->family = sap->sin_family;
2480 ad.a.u.net->dport = sap->sin_port;
2481 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2483 sk_lbl = SMACK_UNLABELED_SOCKET;
2485 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2486 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2488 sk_lbl = SMACK_CIPSO_SOCKET;
2495 return smack_netlabel(sk, sk_lbl);
2498 #if IS_ENABLED(CONFIG_IPV6)
2500 * smk_ipv6_check - check Smack access
2501 * @subject: subject Smack label
2502 * @object: object Smack label
2504 * @act: the action being taken
2506 * Check an IPv6 access
2508 static int smk_ipv6_check(struct smack_known *subject,
2509 struct smack_known *object,
2510 struct sockaddr_in6 *address, int act)
2513 struct lsm_network_audit net;
2515 struct smk_audit_info ad;
2519 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2520 ad.a.u.net->family = PF_INET6;
2521 ad.a.u.net->dport = ntohs(address->sin6_port);
2522 if (act == SMK_RECEIVING)
2523 ad.a.u.net->v6info.saddr = address->sin6_addr;
2525 ad.a.u.net->v6info.daddr = address->sin6_addr;
2527 rc = smk_access(subject, object, MAY_WRITE, &ad);
2528 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2531 #endif /* CONFIG_IPV6 */
2533 #ifdef SMACK_IPV6_PORT_LABELING
2535 * smk_ipv6_port_label - Smack port access table management
2539 * Create or update the port list entry
2541 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2543 struct sock *sk = sock->sk;
2544 struct sockaddr_in6 *addr6;
2545 struct socket_smack *ssp = sock->sk->sk_security;
2546 struct smk_port_label *spp;
2547 unsigned short port = 0;
2549 if (address == NULL) {
2551 * This operation is changing the Smack information
2552 * on the bound socket. Take the changes to the port
2555 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2556 if (sk != spp->smk_sock)
2558 spp->smk_in = ssp->smk_in;
2559 spp->smk_out = ssp->smk_out;
2563 * A NULL address is only used for updating existing
2564 * bound entries. If there isn't one, it's OK.
2569 addr6 = (struct sockaddr_in6 *)address;
2570 port = ntohs(addr6->sin6_port);
2572 * This is a special case that is safely ignored.
2578 * Look for an existing port list entry.
2579 * This is an indication that a port is getting reused.
2581 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2582 if (spp->smk_port != port)
2584 spp->smk_port = port;
2586 spp->smk_in = ssp->smk_in;
2587 spp->smk_out = ssp->smk_out;
2592 * A new port entry is required.
2594 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2598 spp->smk_port = port;
2600 spp->smk_in = ssp->smk_in;
2601 spp->smk_out = ssp->smk_out;
2603 list_add(&spp->list, &smk_ipv6_port_list);
2608 * smk_ipv6_port_check - check Smack port access
2612 * Create or update the port list entry
2614 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2617 struct smk_port_label *spp;
2618 struct socket_smack *ssp = sk->sk_security;
2619 struct smack_known *skp = NULL;
2620 unsigned short port;
2621 struct smack_known *object;
2623 if (act == SMK_RECEIVING) {
2624 skp = smack_ipv6host_label(address);
2625 object = ssp->smk_in;
2628 object = smack_ipv6host_label(address);
2632 * The other end is a single label host.
2634 if (skp != NULL && object != NULL)
2635 return smk_ipv6_check(skp, object, address, act);
2637 skp = smack_net_ambient;
2639 object = smack_net_ambient;
2642 * It's remote, so port lookup does no good.
2644 if (!smk_ipv6_localhost(address))
2645 return smk_ipv6_check(skp, object, address, act);
2648 * It's local so the send check has to have passed.
2650 if (act == SMK_RECEIVING)
2653 port = ntohs(address->sin6_port);
2654 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2655 if (spp->smk_port != port)
2657 object = spp->smk_in;
2658 if (act == SMK_CONNECTING)
2659 ssp->smk_packet = spp->smk_out;
2663 return smk_ipv6_check(skp, object, address, act);
2665 #endif /* SMACK_IPV6_PORT_LABELING */
2668 * smack_inode_setsecurity - set smack xattrs
2669 * @inode: the object
2670 * @name: attribute name
2671 * @value: attribute value
2672 * @size: size of the attribute
2675 * Sets the named attribute in the appropriate blob
2677 * Returns 0 on success, or an error code
2679 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2680 const void *value, size_t size, int flags)
2682 struct smack_known *skp;
2683 struct inode_smack *nsp = inode->i_security;
2684 struct socket_smack *ssp;
2685 struct socket *sock;
2688 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2691 skp = smk_import_entry(value, size);
2693 return PTR_ERR(skp);
2695 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2696 nsp->smk_inode = skp;
2697 nsp->smk_flags |= SMK_INODE_INSTANT;
2701 * The rest of the Smack xattrs are only on sockets.
2703 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2706 sock = SOCKET_I(inode);
2707 if (sock == NULL || sock->sk == NULL)
2710 ssp = sock->sk->sk_security;
2712 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2714 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2716 if (sock->sk->sk_family == PF_INET) {
2717 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2720 "Smack: \"%s\" netlbl error %d.\n",
2726 #ifdef SMACK_IPV6_PORT_LABELING
2727 if (sock->sk->sk_family == PF_INET6)
2728 smk_ipv6_port_label(sock, NULL);
2735 * smack_socket_post_create - finish socket setup
2737 * @family: protocol family
2742 * Sets the netlabel information on the socket
2744 * Returns 0 on success, and error code otherwise
2746 static int smack_socket_post_create(struct socket *sock, int family,
2747 int type, int protocol, int kern)
2749 struct socket_smack *ssp;
2751 if (sock->sk == NULL)
2755 * Sockets created by kernel threads receive web label.
2757 if (unlikely(current->flags & PF_KTHREAD)) {
2758 ssp = sock->sk->sk_security;
2759 ssp->smk_in = &smack_known_web;
2760 ssp->smk_out = &smack_known_web;
2763 if (family != PF_INET)
2766 * Set the outbound netlbl.
2768 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2771 #ifdef SMACK_IPV6_PORT_LABELING
2773 * smack_socket_bind - record port binding information.
2775 * @address: the port address
2776 * @addrlen: size of the address
2778 * Records the label bound to a port.
2782 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2785 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2786 smk_ipv6_port_label(sock, address);
2789 #endif /* SMACK_IPV6_PORT_LABELING */
2792 * smack_socket_connect - connect access check
2794 * @sap: the other end
2795 * @addrlen: size of sap
2797 * Verifies that a connection may be possible
2799 * Returns 0 on success, and error code otherwise
2801 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2805 #if IS_ENABLED(CONFIG_IPV6)
2806 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2808 #ifdef SMACK_IPV6_SECMARK_LABELING
2809 struct smack_known *rsp;
2810 struct socket_smack *ssp = sock->sk->sk_security;
2813 if (sock->sk == NULL)
2816 switch (sock->sk->sk_family) {
2818 if (addrlen < sizeof(struct sockaddr_in))
2820 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2823 if (addrlen < sizeof(struct sockaddr_in6))
2825 #ifdef SMACK_IPV6_SECMARK_LABELING
2826 rsp = smack_ipv6host_label(sip);
2828 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2831 #ifdef SMACK_IPV6_PORT_LABELING
2832 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2840 * smack_flags_to_may - convert S_ to MAY_ values
2841 * @flags: the S_ value
2843 * Returns the equivalent MAY_ value
2845 static int smack_flags_to_may(int flags)
2849 if (flags & S_IRUGO)
2851 if (flags & S_IWUGO)
2853 if (flags & S_IXUGO)
2860 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2865 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2867 struct smack_known *skp = smk_of_current();
2869 msg->security = skp;
2874 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2877 * Clears the blob pointer
2879 static void smack_msg_msg_free_security(struct msg_msg *msg)
2881 msg->security = NULL;
2885 * smack_of_shm - the smack pointer for the shm
2888 * Returns a pointer to the smack value
2890 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2892 return (struct smack_known *)shp->shm_perm.security;
2896 * smack_shm_alloc_security - Set the security blob for shm
2901 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2903 struct kern_ipc_perm *isp = &shp->shm_perm;
2904 struct smack_known *skp = smk_of_current();
2906 isp->security = skp;
2911 * smack_shm_free_security - Clear the security blob for shm
2914 * Clears the blob pointer
2916 static void smack_shm_free_security(struct shmid_kernel *shp)
2918 struct kern_ipc_perm *isp = &shp->shm_perm;
2920 isp->security = NULL;
2924 * smk_curacc_shm : check if current has access on shm
2926 * @access : access requested
2928 * Returns 0 if current has the requested access, error code otherwise
2930 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2932 struct smack_known *ssp = smack_of_shm(shp);
2933 struct smk_audit_info ad;
2937 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2938 ad.a.u.ipc_id = shp->shm_perm.id;
2940 rc = smk_curacc(ssp, access, &ad);
2941 rc = smk_bu_current("shm", ssp, access, rc);
2946 * smack_shm_associate - Smack access check for shm
2948 * @shmflg: access requested
2950 * Returns 0 if current has the requested access, error code otherwise
2952 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2956 may = smack_flags_to_may(shmflg);
2957 return smk_curacc_shm(shp, may);
2961 * smack_shm_shmctl - Smack access check for shm
2963 * @cmd: what it wants to do
2965 * Returns 0 if current has the requested access, error code otherwise
2967 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2980 may = MAY_READWRITE;
2985 * System level information.
2991 return smk_curacc_shm(shp, may);
2995 * smack_shm_shmat - Smack access for shmat
2998 * @shmflg: access requested
3000 * Returns 0 if current has the requested access, error code otherwise
3002 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3007 may = smack_flags_to_may(shmflg);
3008 return smk_curacc_shm(shp, may);
3012 * smack_of_sem - the smack pointer for the sem
3015 * Returns a pointer to the smack value
3017 static struct smack_known *smack_of_sem(struct sem_array *sma)
3019 return (struct smack_known *)sma->sem_perm.security;
3023 * smack_sem_alloc_security - Set the security blob for sem
3028 static int smack_sem_alloc_security(struct sem_array *sma)
3030 struct kern_ipc_perm *isp = &sma->sem_perm;
3031 struct smack_known *skp = smk_of_current();
3033 isp->security = skp;
3038 * smack_sem_free_security - Clear the security blob for sem
3041 * Clears the blob pointer
3043 static void smack_sem_free_security(struct sem_array *sma)
3045 struct kern_ipc_perm *isp = &sma->sem_perm;
3047 isp->security = NULL;
3051 * smk_curacc_sem : check if current has access on sem
3053 * @access : access requested
3055 * Returns 0 if current has the requested access, error code otherwise
3057 static int smk_curacc_sem(struct sem_array *sma, int access)
3059 struct smack_known *ssp = smack_of_sem(sma);
3060 struct smk_audit_info ad;
3064 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3065 ad.a.u.ipc_id = sma->sem_perm.id;
3067 rc = smk_curacc(ssp, access, &ad);
3068 rc = smk_bu_current("sem", ssp, access, rc);
3073 * smack_sem_associate - Smack access check for sem
3075 * @semflg: access requested
3077 * Returns 0 if current has the requested access, error code otherwise
3079 static int smack_sem_associate(struct sem_array *sma, int semflg)
3083 may = smack_flags_to_may(semflg);
3084 return smk_curacc_sem(sma, may);
3088 * smack_sem_shmctl - Smack access check for sem
3090 * @cmd: what it wants to do
3092 * Returns 0 if current has the requested access, error code otherwise
3094 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3112 may = MAY_READWRITE;
3117 * System level information
3124 return smk_curacc_sem(sma, may);
3128 * smack_sem_semop - Smack checks of semaphore operations
3134 * Treated as read and write in all cases.
3136 * Returns 0 if access is allowed, error code otherwise
3138 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3139 unsigned nsops, int alter)
3141 return smk_curacc_sem(sma, MAY_READWRITE);
3145 * smack_msg_alloc_security - Set the security blob for msg
3150 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3152 struct kern_ipc_perm *kisp = &msq->q_perm;
3153 struct smack_known *skp = smk_of_current();
3155 kisp->security = skp;
3160 * smack_msg_free_security - Clear the security blob for msg
3163 * Clears the blob pointer
3165 static void smack_msg_queue_free_security(struct msg_queue *msq)
3167 struct kern_ipc_perm *kisp = &msq->q_perm;
3169 kisp->security = NULL;
3173 * smack_of_msq - the smack pointer for the msq
3176 * Returns a pointer to the smack label entry
3178 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3180 return (struct smack_known *)msq->q_perm.security;
3184 * smk_curacc_msq : helper to check if current has access on msq
3186 * @access : access requested
3188 * return 0 if current has access, error otherwise
3190 static int smk_curacc_msq(struct msg_queue *msq, int access)
3192 struct smack_known *msp = smack_of_msq(msq);
3193 struct smk_audit_info ad;
3197 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3198 ad.a.u.ipc_id = msq->q_perm.id;
3200 rc = smk_curacc(msp, access, &ad);
3201 rc = smk_bu_current("msq", msp, access, rc);
3206 * smack_msg_queue_associate - Smack access check for msg_queue
3208 * @msqflg: access requested
3210 * Returns 0 if current has the requested access, error code otherwise
3212 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3216 may = smack_flags_to_may(msqflg);
3217 return smk_curacc_msq(msq, may);
3221 * smack_msg_queue_msgctl - Smack access check for msg_queue
3223 * @cmd: what it wants to do
3225 * Returns 0 if current has the requested access, error code otherwise
3227 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3238 may = MAY_READWRITE;
3243 * System level information
3250 return smk_curacc_msq(msq, may);
3254 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3257 * @msqflg: access requested
3259 * Returns 0 if current has the requested access, error code otherwise
3261 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3266 may = smack_flags_to_may(msqflg);
3267 return smk_curacc_msq(msq, may);
3271 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3278 * Returns 0 if current has read and write access, error code otherwise
3280 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3281 struct task_struct *target, long type, int mode)
3283 return smk_curacc_msq(msq, MAY_READWRITE);
3287 * smack_ipc_permission - Smack access for ipc_permission()
3288 * @ipp: the object permissions
3289 * @flag: access requested
3291 * Returns 0 if current has read and write access, error code otherwise
3293 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3295 struct smack_known *iskp = ipp->security;
3296 int may = smack_flags_to_may(flag);
3297 struct smk_audit_info ad;
3301 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3302 ad.a.u.ipc_id = ipp->id;
3304 rc = smk_curacc(iskp, may, &ad);
3305 rc = smk_bu_current("svipc", iskp, may, rc);
3310 * smack_ipc_getsecid - Extract smack security id
3311 * @ipp: the object permissions
3312 * @secid: where result will be saved
3314 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3316 struct smack_known *iskp = ipp->security;
3318 *secid = iskp->smk_secid;
3322 * smack_d_instantiate - Make sure the blob is correct on an inode
3323 * @opt_dentry: dentry where inode will be attached
3324 * @inode: the object
3326 * Set the inode's security blob if it hasn't been done already.
3328 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3330 struct super_block *sbp;
3331 struct superblock_smack *sbsp;
3332 struct inode_smack *isp;
3333 struct smack_known *skp;
3334 struct smack_known *ckp = smk_of_current();
3335 struct smack_known *final;
3336 char trattr[TRANS_TRUE_SIZE];
3344 isp = inode->i_security;
3346 mutex_lock(&isp->smk_lock);
3348 * If the inode is already instantiated
3349 * take the quick way out
3351 if (isp->smk_flags & SMK_INODE_INSTANT)
3355 sbsp = sbp->s_security;
3357 * We're going to use the superblock default label
3358 * if there's no label on the file.
3360 final = sbsp->smk_default;
3363 * If this is the root inode the superblock
3364 * may be in the process of initialization.
3365 * If that is the case use the root value out
3366 * of the superblock.
3368 if (opt_dentry->d_parent == opt_dentry) {
3369 switch (sbp->s_magic) {
3370 case CGROUP_SUPER_MAGIC:
3372 * The cgroup filesystem is never mounted,
3373 * so there's no opportunity to set the mount
3376 sbsp->smk_root = &smack_known_star;
3377 sbsp->smk_default = &smack_known_star;
3378 isp->smk_inode = sbsp->smk_root;
3382 * What about shmem/tmpfs anonymous files with dentry
3383 * obtained from d_alloc_pseudo()?
3385 isp->smk_inode = smk_of_current();
3388 isp->smk_inode = smk_of_current();
3391 isp->smk_inode = sbsp->smk_root;
3394 isp->smk_flags |= SMK_INODE_INSTANT;
3399 * This is pretty hackish.
3400 * Casey says that we shouldn't have to do
3401 * file system specific code, but it does help
3402 * with keeping it simple.
3404 switch (sbp->s_magic) {
3408 case CGROUP_SUPER_MAGIC:
3410 * Casey says that it's a little embarrassing
3411 * that the smack file system doesn't do
3412 * extended attributes.
3414 * Casey says pipes are easy (?)
3416 * Socket access is controlled by the socket
3417 * structures associated with the task involved.
3419 * Cgroupfs is special
3421 final = &smack_known_star;
3423 case DEVPTS_SUPER_MAGIC:
3425 * devpts seems content with the label of the task.
3426 * Programs that change smack have to treat the
3431 case PROC_SUPER_MAGIC:
3433 * Casey says procfs appears not to care.
3434 * The superblock default suffices.
3439 * Device labels should come from the filesystem,
3440 * but watch out, because they're volitile,
3441 * getting recreated on every reboot.
3443 final = &smack_known_star;
3447 * If a smack value has been set we want to use it,
3448 * but since tmpfs isn't giving us the opportunity
3449 * to set mount options simulate setting the
3450 * superblock default.
3454 * This isn't an understood special case.
3455 * Get the value from the xattr.
3459 * UNIX domain sockets use lower level socket data.
3461 if (S_ISSOCK(inode->i_mode)) {
3462 final = &smack_known_star;
3466 * No xattr support means, alas, no SMACK label.
3467 * Use the aforeapplied default.
3468 * It would be curious if the label of the task
3469 * does not match that assigned.
3471 if (inode->i_op->getxattr == NULL)
3474 * Get the dentry for xattr.
3476 dp = dget(opt_dentry);
3477 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3478 if (!IS_ERR_OR_NULL(skp))
3482 * Transmuting directory
3484 if (S_ISDIR(inode->i_mode)) {
3486 * If this is a new directory and the label was
3487 * transmuted when the inode was initialized
3488 * set the transmute attribute on the directory
3489 * and mark the inode.
3491 * If there is a transmute attribute on the
3492 * directory mark the inode.
3494 if (isp->smk_flags & SMK_INODE_CHANGED) {
3495 isp->smk_flags &= ~SMK_INODE_CHANGED;
3496 rc = inode->i_op->setxattr(dp,
3497 XATTR_NAME_SMACKTRANSMUTE,
3498 TRANS_TRUE, TRANS_TRUE_SIZE,
3501 rc = inode->i_op->getxattr(dp,
3502 XATTR_NAME_SMACKTRANSMUTE, trattr,
3504 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3505 TRANS_TRUE_SIZE) != 0)
3509 transflag = SMK_INODE_TRANSMUTE;
3512 * Don't let the exec or mmap label be "*" or "@".
3514 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3515 if (IS_ERR(skp) || skp == &smack_known_star ||
3516 skp == &smack_known_web)
3518 isp->smk_task = skp;
3520 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3521 if (IS_ERR(skp) || skp == &smack_known_star ||
3522 skp == &smack_known_web)
3524 isp->smk_mmap = skp;
3531 isp->smk_inode = ckp;
3533 isp->smk_inode = final;
3535 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3538 mutex_unlock(&isp->smk_lock);
3543 * smack_getprocattr - Smack process attribute access
3544 * @p: the object task
3545 * @name: the name of the attribute in /proc/.../attr
3546 * @value: where to put the result
3548 * Places a copy of the task Smack into value
3550 * Returns the length of the smack label or an error code
3552 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3554 struct smack_known *skp = smk_of_task_struct(p);
3558 if (strcmp(name, "current") != 0)
3561 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3571 * smack_setprocattr - Smack process attribute setting
3572 * @p: the object task
3573 * @name: the name of the attribute in /proc/.../attr
3574 * @value: the value to set
3575 * @size: the size of the value
3577 * Sets the Smack value of the task. Only setting self
3578 * is permitted and only with privilege
3580 * Returns the length of the smack label or an error code
3582 static int smack_setprocattr(struct task_struct *p, char *name,
3583 void *value, size_t size)
3585 struct task_smack *tsp = current_security();
3587 struct smack_known *skp;
3588 struct smack_known_list_elem *sklep;
3592 * Changing another process' Smack value is too dangerous
3593 * and supports no sane use case.
3598 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3601 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3604 if (strcmp(name, "current") != 0)
3607 skp = smk_import_entry(value, size);
3609 return PTR_ERR(skp);
3612 * No process is ever allowed the web ("@") label.
3614 if (skp == &smack_known_web)
3617 if (!smack_privileged(CAP_MAC_ADMIN)) {
3619 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3620 if (sklep->smk_label == skp) {
3628 new = prepare_creds();
3632 tsp = new->security;
3633 tsp->smk_task = skp;
3635 * process can change its label only once
3637 smk_destroy_label_list(&tsp->smk_relabel);
3644 * smack_unix_stream_connect - Smack access on UDS
3646 * @other: the other sock
3649 * Return 0 if a subject with the smack of sock could access
3650 * an object with the smack of other, otherwise an error code
3652 static int smack_unix_stream_connect(struct sock *sock,
3653 struct sock *other, struct sock *newsk)
3655 struct smack_known *skp;
3656 struct smack_known *okp;
3657 struct socket_smack *ssp = sock->sk_security;
3658 struct socket_smack *osp = other->sk_security;
3659 struct socket_smack *nsp = newsk->sk_security;
3660 struct smk_audit_info ad;
3663 struct lsm_network_audit net;
3666 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3670 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3671 smk_ad_setfield_u_net_sk(&ad, other);
3673 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3674 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3678 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3679 rc = smk_bu_note("UDS connect", okp, skp,
3685 * Cross reference the peer labels for SO_PEERSEC.
3688 nsp->smk_packet = ssp->smk_out;
3689 ssp->smk_packet = osp->smk_out;
3696 * smack_unix_may_send - Smack access on UDS
3698 * @other: the other socket
3700 * Return 0 if a subject with the smack of sock could access
3701 * an object with the smack of other, otherwise an error code
3703 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3705 struct socket_smack *ssp = sock->sk->sk_security;
3706 struct socket_smack *osp = other->sk->sk_security;
3707 struct smk_audit_info ad;
3711 struct lsm_network_audit net;
3713 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3714 smk_ad_setfield_u_net_sk(&ad, other->sk);
3717 if (smack_privileged(CAP_MAC_OVERRIDE))
3720 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3721 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3726 * smack_socket_sendmsg - Smack check based on destination host
3729 * @size: the size of the message
3731 * Return 0 if the current subject can write to the destination host.
3732 * For IPv4 this is only a question if the destination is a single label host.
3733 * For IPv6 this is a check against the label of the port.
3735 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3738 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3739 #if IS_ENABLED(CONFIG_IPV6)
3740 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3742 #ifdef SMACK_IPV6_SECMARK_LABELING
3743 struct socket_smack *ssp = sock->sk->sk_security;
3744 struct smack_known *rsp;
3749 * Perfectly reasonable for this to be NULL
3754 switch (sip->sin_family) {
3756 rc = smack_netlabel_send(sock->sk, sip);
3759 #ifdef SMACK_IPV6_SECMARK_LABELING
3760 rsp = smack_ipv6host_label(sap);
3762 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3765 #ifdef SMACK_IPV6_PORT_LABELING
3766 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3774 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3775 * @sap: netlabel secattr
3776 * @ssp: socket security information
3778 * Returns a pointer to a Smack label entry found on the label list.
3780 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3781 struct socket_smack *ssp)
3783 struct smack_known *skp;
3788 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3790 * Looks like a CIPSO packet.
3791 * If there are flags but no level netlabel isn't
3792 * behaving the way we expect it to.
3794 * Look it up in the label table
3795 * Without guidance regarding the smack value
3796 * for the packet fall back on the network
3800 list_for_each_entry(skp, &smack_known_list, list) {
3801 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3804 * Compare the catsets. Use the netlbl APIs.
3806 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3807 if ((skp->smk_netlabel.flags &
3808 NETLBL_SECATTR_MLS_CAT) == 0)
3812 for (acat = -1, kcat = -1; acat == kcat; ) {
3813 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3815 kcat = netlbl_catmap_walk(
3816 skp->smk_netlabel.attr.mls.cat,
3818 if (acat < 0 || kcat < 0)
3831 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3832 return &smack_known_web;
3833 return &smack_known_star;
3835 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3837 * Looks like a fallback, which gives us a secid.
3839 skp = smack_from_secid(sap->attr.secid);
3841 * This has got to be a bug because it is
3842 * impossible to specify a fallback without
3843 * specifying the label, which will ensure
3844 * it has a secid, and the only way to get a
3845 * secid is from a fallback.
3847 BUG_ON(skp == NULL);
3851 * Without guidance regarding the smack value
3852 * for the packet fall back on the network
3855 return smack_net_ambient;
3858 #if IS_ENABLED(CONFIG_IPV6)
3859 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3863 int proto = -EINVAL;
3864 struct ipv6hdr _ipv6h;
3865 struct ipv6hdr *ip6;
3867 struct tcphdr _tcph, *th;
3868 struct udphdr _udph, *uh;
3869 struct dccp_hdr _dccph, *dh;
3873 offset = skb_network_offset(skb);
3874 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3877 sip->sin6_addr = ip6->saddr;
3879 nexthdr = ip6->nexthdr;
3880 offset += sizeof(_ipv6h);
3881 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3888 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3890 sip->sin6_port = th->source;
3893 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3895 sip->sin6_port = uh->source;
3898 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3900 sip->sin6_port = dh->dccph_sport;
3905 #endif /* CONFIG_IPV6 */
3908 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3912 * Returns 0 if the packet should be delivered, an error code otherwise
3914 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3916 struct netlbl_lsm_secattr secattr;
3917 struct socket_smack *ssp = sk->sk_security;
3918 struct smack_known *skp = NULL;
3920 struct smk_audit_info ad;
3922 struct lsm_network_audit net;
3924 #if IS_ENABLED(CONFIG_IPV6)
3925 struct sockaddr_in6 sadd;
3927 #endif /* CONFIG_IPV6 */
3929 switch (sk->sk_family) {
3931 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3933 * If there is a secmark use it rather than the CIPSO label.
3934 * If there is no secmark fall back to CIPSO.
3935 * The secmark is assumed to reflect policy better.
3937 if (skb && skb->secmark != 0) {
3938 skp = smack_from_secid(skb->secmark);
3941 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3943 * Translate what netlabel gave us.
3945 netlbl_secattr_init(&secattr);
3947 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3949 skp = smack_from_secattr(&secattr, ssp);
3951 skp = smack_net_ambient;
3953 netlbl_secattr_destroy(&secattr);
3955 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3959 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3960 ad.a.u.net->family = sk->sk_family;
3961 ad.a.u.net->netif = skb->skb_iif;
3962 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3965 * Receiving a packet requires that the other end
3966 * be able to write here. Read access is not required.
3967 * This is the simplist possible security model
3970 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3971 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
3974 netlbl_skbuff_err(skb, rc, 0);
3976 #if IS_ENABLED(CONFIG_IPV6)
3978 proto = smk_skb_to_addr_ipv6(skb, &sadd);
3979 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
3981 #ifdef SMACK_IPV6_SECMARK_LABELING
3982 if (skb && skb->secmark != 0)
3983 skp = smack_from_secid(skb->secmark);
3985 skp = smack_ipv6host_label(&sadd);
3987 skp = smack_net_ambient;
3991 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3992 ad.a.u.net->family = sk->sk_family;
3993 ad.a.u.net->netif = skb->skb_iif;
3994 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
3995 #endif /* CONFIG_AUDIT */
3996 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3997 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
3999 #endif /* SMACK_IPV6_SECMARK_LABELING */
4000 #ifdef SMACK_IPV6_PORT_LABELING
4001 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4002 #endif /* SMACK_IPV6_PORT_LABELING */
4004 #endif /* CONFIG_IPV6 */
4011 * smack_socket_getpeersec_stream - pull in packet label
4013 * @optval: user's destination
4014 * @optlen: size thereof
4017 * returns zero on success, an error code otherwise
4019 static int smack_socket_getpeersec_stream(struct socket *sock,
4020 char __user *optval,
4021 int __user *optlen, unsigned len)
4023 struct socket_smack *ssp;
4028 ssp = sock->sk->sk_security;
4029 if (ssp->smk_packet != NULL) {
4030 rcp = ssp->smk_packet->smk_known;
4031 slen = strlen(rcp) + 1;
4036 else if (copy_to_user(optval, rcp, slen) != 0)
4039 if (put_user(slen, optlen) != 0)
4047 * smack_socket_getpeersec_dgram - pull in packet label
4048 * @sock: the peer socket
4050 * @secid: pointer to where to put the secid of the packet
4052 * Sets the netlabel socket state on sk from parent
4054 static int smack_socket_getpeersec_dgram(struct socket *sock,
4055 struct sk_buff *skb, u32 *secid)
4058 struct netlbl_lsm_secattr secattr;
4059 struct socket_smack *ssp = NULL;
4060 struct smack_known *skp;
4061 int family = PF_UNSPEC;
4062 u32 s = 0; /* 0 is the invalid secid */
4066 if (skb->protocol == htons(ETH_P_IP))
4068 #if IS_ENABLED(CONFIG_IPV6)
4069 else if (skb->protocol == htons(ETH_P_IPV6))
4071 #endif /* CONFIG_IPV6 */
4073 if (family == PF_UNSPEC && sock != NULL)
4074 family = sock->sk->sk_family;
4078 ssp = sock->sk->sk_security;
4079 s = ssp->smk_out->smk_secid;
4082 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4088 * Translate what netlabel gave us.
4090 if (sock != NULL && sock->sk != NULL)
4091 ssp = sock->sk->sk_security;
4092 netlbl_secattr_init(&secattr);
4093 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4095 skp = smack_from_secattr(&secattr, ssp);
4098 netlbl_secattr_destroy(&secattr);
4101 #ifdef SMACK_IPV6_SECMARK_LABELING
4113 * smack_sock_graft - Initialize a newly created socket with an existing sock
4115 * @parent: parent socket
4117 * Set the smk_{in,out} state of an existing sock based on the process that
4118 * is creating the new socket.
4120 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4122 struct socket_smack *ssp;
4123 struct smack_known *skp = smk_of_current();
4126 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4129 ssp = sk->sk_security;
4132 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4136 * smack_inet_conn_request - Smack access check on connect
4137 * @sk: socket involved
4141 * Returns 0 if a task with the packet label could write to
4142 * the socket, otherwise an error code
4144 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4145 struct request_sock *req)
4147 u16 family = sk->sk_family;
4148 struct smack_known *skp;
4149 struct socket_smack *ssp = sk->sk_security;
4150 struct netlbl_lsm_secattr secattr;
4151 struct sockaddr_in addr;
4153 struct smack_known *hskp;
4155 struct smk_audit_info ad;
4157 struct lsm_network_audit net;
4160 #if IS_ENABLED(CONFIG_IPV6)
4161 if (family == PF_INET6) {
4163 * Handle mapped IPv4 packets arriving
4164 * via IPv6 sockets. Don't set up netlabel
4165 * processing on IPv6.
4167 if (skb->protocol == htons(ETH_P_IP))
4172 #endif /* CONFIG_IPV6 */
4174 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4176 * If there is a secmark use it rather than the CIPSO label.
4177 * If there is no secmark fall back to CIPSO.
4178 * The secmark is assumed to reflect policy better.
4180 if (skb && skb->secmark != 0) {
4181 skp = smack_from_secid(skb->secmark);
4184 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4186 netlbl_secattr_init(&secattr);
4187 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4189 skp = smack_from_secattr(&secattr, ssp);
4191 skp = &smack_known_huh;
4192 netlbl_secattr_destroy(&secattr);
4194 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4199 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4200 ad.a.u.net->family = family;
4201 ad.a.u.net->netif = skb->skb_iif;
4202 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4205 * Receiving a packet requires that the other end be able to write
4206 * here. Read access is not required.
4208 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4209 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4214 * Save the peer's label in the request_sock so we can later setup
4215 * smk_packet in the child socket so that SO_PEERCRED can report it.
4217 req->peer_secid = skp->smk_secid;
4220 * We need to decide if we want to label the incoming connection here
4221 * if we do we only need to label the request_sock and the stack will
4222 * propagate the wire-label to the sock when it is created.
4225 addr.sin_addr.s_addr = hdr->saddr;
4227 hskp = smack_ipv4host_label(&addr);
4231 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4233 netlbl_req_delattr(req);
4239 * smack_inet_csk_clone - Copy the connection information to the new socket
4240 * @sk: the new socket
4241 * @req: the connection's request_sock
4243 * Transfer the connection's peer label to the newly created socket.
4245 static void smack_inet_csk_clone(struct sock *sk,
4246 const struct request_sock *req)
4248 struct socket_smack *ssp = sk->sk_security;
4249 struct smack_known *skp;
4251 if (req->peer_secid != 0) {
4252 skp = smack_from_secid(req->peer_secid);
4253 ssp->smk_packet = skp;
4255 ssp->smk_packet = NULL;
4259 * Key management security hooks
4261 * Casey has not tested key support very heavily.
4262 * The permission check is most likely too restrictive.
4263 * If you care about keys please have a look.
4268 * smack_key_alloc - Set the key security blob
4270 * @cred: the credentials to use
4273 * No allocation required
4277 static int smack_key_alloc(struct key *key, const struct cred *cred,
4278 unsigned long flags)
4280 struct smack_known *skp = smk_of_task(cred->security);
4282 key->security = skp;
4287 * smack_key_free - Clear the key security blob
4290 * Clear the blob pointer
4292 static void smack_key_free(struct key *key)
4294 key->security = NULL;
4298 * smack_key_permission - Smack access on a key
4299 * @key_ref: gets to the object
4300 * @cred: the credentials to use
4301 * @perm: requested key permissions
4303 * Return 0 if the task has read and write to the object,
4304 * an error code otherwise
4306 static int smack_key_permission(key_ref_t key_ref,
4307 const struct cred *cred, unsigned perm)
4310 struct smk_audit_info ad;
4311 struct smack_known *tkp = smk_of_task(cred->security);
4316 * Validate requested permissions
4318 if (perm & ~KEY_NEED_ALL)
4321 keyp = key_ref_to_ptr(key_ref);
4325 * If the key hasn't been initialized give it access so that
4328 if (keyp->security == NULL)
4331 * This should not occur
4336 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4337 ad.a.u.key_struct.key = keyp->serial;
4338 ad.a.u.key_struct.key_desc = keyp->description;
4340 if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW))
4341 request |= MAY_READ;
4342 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4343 request |= MAY_WRITE;
4344 rc = smk_access(tkp, keyp->security, request, &ad);
4345 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4350 * smack_key_getsecurity - Smack label tagging the key
4351 * @key points to the key to be queried
4352 * @_buffer points to a pointer that should be set to point to the
4353 * resulting string (if no label or an error occurs).
4354 * Return the length of the string (including terminating NUL) or -ve if
4356 * May also return 0 (and a NULL buffer pointer) if there is no label.
4358 static int smack_key_getsecurity(struct key *key, char **_buffer)
4360 struct smack_known *skp = key->security;
4364 if (key->security == NULL) {
4369 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4372 length = strlen(copy) + 1;
4378 #endif /* CONFIG_KEYS */
4383 * Audit requires a unique representation of each Smack specific
4384 * rule. This unique representation is used to distinguish the
4385 * object to be audited from remaining kernel objects and also
4386 * works as a glue between the audit hooks.
4388 * Since repository entries are added but never deleted, we'll use
4389 * the smack_known label address related to the given audit rule as
4390 * the needed unique representation. This also better fits the smack
4391 * model where nearly everything is a label.
4396 * smack_audit_rule_init - Initialize a smack audit rule
4397 * @field: audit rule fields given from user-space (audit.h)
4398 * @op: required testing operator (=, !=, >, <, ...)
4399 * @rulestr: smack label to be audited
4400 * @vrule: pointer to save our own audit rule representation
4402 * Prepare to audit cases where (@field @op @rulestr) is true.
4403 * The label to be audited is created if necessay.
4405 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4407 struct smack_known *skp;
4408 char **rule = (char **)vrule;
4411 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4414 if (op != Audit_equal && op != Audit_not_equal)
4417 skp = smk_import_entry(rulestr, 0);
4419 return PTR_ERR(skp);
4421 *rule = skp->smk_known;
4427 * smack_audit_rule_known - Distinguish Smack audit rules
4428 * @krule: rule of interest, in Audit kernel representation format
4430 * This is used to filter Smack rules from remaining Audit ones.
4431 * If it's proved that this rule belongs to us, the
4432 * audit_rule_match hook will be called to do the final judgement.
4434 static int smack_audit_rule_known(struct audit_krule *krule)
4436 struct audit_field *f;
4439 for (i = 0; i < krule->field_count; i++) {
4440 f = &krule->fields[i];
4442 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4450 * smack_audit_rule_match - Audit given object ?
4451 * @secid: security id for identifying the object to test
4452 * @field: audit rule flags given from user-space
4453 * @op: required testing operator
4454 * @vrule: smack internal rule presentation
4455 * @actx: audit context associated with the check
4457 * The core Audit hook. It's used to take the decision of
4458 * whether to audit or not to audit a given object.
4460 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4461 struct audit_context *actx)
4463 struct smack_known *skp;
4466 if (unlikely(!rule)) {
4467 WARN_ONCE(1, "Smack: missing rule\n");
4471 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4474 skp = smack_from_secid(secid);
4477 * No need to do string comparisons. If a match occurs,
4478 * both pointers will point to the same smack_known
4481 if (op == Audit_equal)
4482 return (rule == skp->smk_known);
4483 if (op == Audit_not_equal)
4484 return (rule != skp->smk_known);
4490 * smack_audit_rule_free - free smack rule representation
4491 * @vrule: rule to be freed.
4493 * No memory was allocated.
4495 static void smack_audit_rule_free(void *vrule)
4500 #endif /* CONFIG_AUDIT */
4503 * smack_ismaclabel - check if xattr @name references a smack MAC label
4504 * @name: Full xattr name to check.
4506 static int smack_ismaclabel(const char *name)
4508 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4513 * smack_secid_to_secctx - return the smack label for a secid
4514 * @secid: incoming integer
4515 * @secdata: destination
4516 * @seclen: how long it is
4518 * Exists for networking code.
4520 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4522 struct smack_known *skp = smack_from_secid(secid);
4525 *secdata = skp->smk_known;
4526 *seclen = strlen(skp->smk_known);
4531 * smack_secctx_to_secid - return the secid for a smack label
4532 * @secdata: smack label
4533 * @seclen: how long result is
4534 * @secid: outgoing integer
4536 * Exists for audit and networking code.
4538 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4540 struct smack_known *skp = smk_find_entry(secdata);
4543 *secid = skp->smk_secid;
4550 * smack_release_secctx - don't do anything.
4554 * Exists to make sure nothing gets done, and properly
4556 static void smack_release_secctx(char *secdata, u32 seclen)
4560 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4562 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4565 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4567 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4570 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4573 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4581 static struct security_hook_list smack_hooks[] = {
4582 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4583 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4584 LSM_HOOK_INIT(syslog, smack_syslog),
4586 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4587 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4588 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4589 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4590 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4591 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4592 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4594 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4595 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4596 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4598 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4599 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4600 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4601 LSM_HOOK_INIT(inode_link, smack_inode_link),
4602 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4603 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4604 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4605 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4606 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4607 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4608 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4609 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4610 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4611 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4612 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4613 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4614 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4615 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4617 LSM_HOOK_INIT(file_permission, smack_file_permission),
4618 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4619 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4620 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4621 LSM_HOOK_INIT(file_lock, smack_file_lock),
4622 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4623 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4624 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4625 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4626 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4627 LSM_HOOK_INIT(file_receive, smack_file_receive),
4629 LSM_HOOK_INIT(file_open, smack_file_open),
4631 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4632 LSM_HOOK_INIT(cred_free, smack_cred_free),
4633 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4634 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4635 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4636 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4637 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4638 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4639 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4640 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4641 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4642 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4643 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4644 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4645 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4646 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4647 LSM_HOOK_INIT(task_kill, smack_task_kill),
4648 LSM_HOOK_INIT(task_wait, smack_task_wait),
4649 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4651 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4652 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4654 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4655 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4657 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4658 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4659 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4660 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4661 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4662 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4664 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4665 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4666 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4667 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4668 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4670 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4671 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4672 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4673 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4674 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4676 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4678 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4679 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4681 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4682 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4684 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4685 #ifdef SMACK_IPV6_PORT_LABELING
4686 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4688 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4689 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4690 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4691 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4692 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4693 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4694 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4695 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4696 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4697 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4699 /* key management security hooks */
4701 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4702 LSM_HOOK_INIT(key_free, smack_key_free),
4703 LSM_HOOK_INIT(key_permission, smack_key_permission),
4704 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4705 #endif /* CONFIG_KEYS */
4709 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4710 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4711 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4712 LSM_HOOK_INIT(audit_rule_free, smack_audit_rule_free),
4713 #endif /* CONFIG_AUDIT */
4715 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4716 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4717 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4718 LSM_HOOK_INIT(release_secctx, smack_release_secctx),
4719 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4720 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4721 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4725 static __init void init_smack_known_list(void)
4728 * Initialize rule list locks
4730 mutex_init(&smack_known_huh.smk_rules_lock);
4731 mutex_init(&smack_known_hat.smk_rules_lock);
4732 mutex_init(&smack_known_floor.smk_rules_lock);
4733 mutex_init(&smack_known_star.smk_rules_lock);
4734 mutex_init(&smack_known_invalid.smk_rules_lock);
4735 mutex_init(&smack_known_web.smk_rules_lock);
4737 * Initialize rule lists
4739 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4740 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4741 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4742 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4743 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
4744 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4746 * Create the known labels list
4748 smk_insert_entry(&smack_known_huh);
4749 smk_insert_entry(&smack_known_hat);
4750 smk_insert_entry(&smack_known_star);
4751 smk_insert_entry(&smack_known_floor);
4752 smk_insert_entry(&smack_known_invalid);
4753 smk_insert_entry(&smack_known_web);
4757 * smack_init - initialize the smack system
4761 static __init int smack_init(void)
4764 struct task_smack *tsp;
4766 if (!security_module_enable("smack"))
4769 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4770 if (!smack_inode_cache)
4773 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4776 kmem_cache_destroy(smack_inode_cache);
4782 pr_info("Smack: Initializing.\n");
4783 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4784 pr_info("Smack: Netfilter enabled.\n");
4786 #ifdef SMACK_IPV6_PORT_LABELING
4787 pr_info("Smack: IPv6 port labeling enabled.\n");
4789 #ifdef SMACK_IPV6_SECMARK_LABELING
4790 pr_info("Smack: IPv6 Netfilter enabled.\n");
4794 * Set the security state for the initial task.
4796 cred = (struct cred *) current->cred;
4797 cred->security = tsp;
4799 /* initialize the smack_known_list */
4800 init_smack_known_list();
4805 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks));
4811 * Smack requires early initialization in order to label
4812 * all processes and objects when they are created.
4814 security_initcall(smack_init);