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 DEFINE_MUTEX(smack_ipv6_lock);
56 static LIST_HEAD(smk_ipv6_port_list);
58 static struct kmem_cache *smack_inode_cache;
61 static const match_table_t smk_mount_tokens = {
62 {Opt_fsdefault, SMK_FSDEFAULT "%s"},
63 {Opt_fsfloor, SMK_FSFLOOR "%s"},
64 {Opt_fshat, SMK_FSHAT "%s"},
65 {Opt_fsroot, SMK_FSROOT "%s"},
66 {Opt_fstransmute, SMK_FSTRANS "%s"},
70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
71 static char *smk_bu_mess[] = {
72 "Bringup Error", /* Unused */
73 "Bringup", /* SMACK_BRINGUP_ALLOW */
74 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
75 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
78 static void smk_bu_mode(int mode, char *s)
88 if (mode & MAY_APPEND)
90 if (mode & MAY_TRANSMUTE)
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note, struct smack_known *sskp,
102 struct smack_known *oskp, int mode, int rc)
104 char acc[SMK_NUM_ACCESS_TYPE + 1];
108 if (rc > SMACK_UNCONFINED_OBJECT)
111 smk_bu_mode(mode, acc);
112 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
113 sskp->smk_known, oskp->smk_known, acc, note);
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note, struct smack_known *oskp,
124 struct task_smack *tsp = current_security();
125 char acc[SMK_NUM_ACCESS_TYPE + 1];
129 if (rc > SMACK_UNCONFINED_OBJECT)
132 smk_bu_mode(mode, acc);
133 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
134 tsp->smk_task->smk_known, oskp->smk_known,
135 acc, current->comm, note);
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
145 struct task_smack *tsp = current_security();
146 struct smack_known *smk_task = smk_of_task_struct(otp);
147 char acc[SMK_NUM_ACCESS_TYPE + 1];
151 if (rc > SMACK_UNCONFINED_OBJECT)
154 smk_bu_mode(mode, acc);
155 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
156 tsp->smk_task->smk_known, smk_task->smk_known, acc,
157 current->comm, otp->comm);
161 #define smk_bu_task(otp, mode, RC) (RC)
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode *inode, int mode, int rc)
167 struct task_smack *tsp = current_security();
168 struct inode_smack *isp = inode->i_security;
169 char acc[SMK_NUM_ACCESS_TYPE + 1];
171 if (isp->smk_flags & SMK_INODE_IMPURE)
172 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173 inode->i_sb->s_id, inode->i_ino, current->comm);
177 if (rc > SMACK_UNCONFINED_OBJECT)
179 if (rc == SMACK_UNCONFINED_SUBJECT &&
180 (mode & (MAY_WRITE | MAY_APPEND)))
181 isp->smk_flags |= SMK_INODE_IMPURE;
183 smk_bu_mode(mode, acc);
185 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
186 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
187 inode->i_sb->s_id, inode->i_ino, current->comm);
191 #define smk_bu_inode(inode, mode, RC) (RC)
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file *file, int mode, int rc)
197 struct task_smack *tsp = current_security();
198 struct smack_known *sskp = tsp->smk_task;
199 struct inode *inode = file_inode(file);
200 struct inode_smack *isp = inode->i_security;
201 char acc[SMK_NUM_ACCESS_TYPE + 1];
203 if (isp->smk_flags & SMK_INODE_IMPURE)
204 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205 inode->i_sb->s_id, inode->i_ino, current->comm);
209 if (rc > SMACK_UNCONFINED_OBJECT)
212 smk_bu_mode(mode, acc);
213 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
214 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
215 inode->i_sb->s_id, inode->i_ino, file,
220 #define smk_bu_file(file, mode, RC) (RC)
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred *cred, struct file *file,
227 struct task_smack *tsp = cred->security;
228 struct smack_known *sskp = tsp->smk_task;
229 struct inode *inode = file_inode(file);
230 struct inode_smack *isp = inode->i_security;
231 char acc[SMK_NUM_ACCESS_TYPE + 1];
233 if (isp->smk_flags & SMK_INODE_IMPURE)
234 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235 inode->i_sb->s_id, inode->i_ino, current->comm);
239 if (rc > SMACK_UNCONFINED_OBJECT)
242 smk_bu_mode(mode, acc);
243 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
244 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
245 inode->i_sb->s_id, inode->i_ino, file,
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
254 * smk_fetch - Fetch the smack label from a file.
255 * @name: type of the label (attribute)
256 * @ip: a pointer to the inode
257 * @dp: a pointer to the dentry
259 * Returns a pointer to the master list entry for the Smack label,
260 * NULL if there was no label to fetch, or an error code.
262 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
267 struct smack_known *skp = NULL;
269 if (!(ip->i_opflags & IOP_XATTR))
270 return ERR_PTR(-EOPNOTSUPP);
272 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
274 return ERR_PTR(-ENOMEM);
276 rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
282 skp = smk_import_entry(buffer, rc);
290 * new_inode_smack - allocate an inode security blob
291 * @skp: a pointer to the Smack label entry to use in the blob
293 * Returns the new blob or NULL if there's no memory available
295 static struct inode_smack *new_inode_smack(struct smack_known *skp)
297 struct inode_smack *isp;
299 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
303 isp->smk_inode = skp;
305 mutex_init(&isp->smk_lock);
311 * new_task_smack - allocate a task security blob
312 * @task: a pointer to the Smack label for the running task
313 * @forked: a pointer to the Smack label for the forked task
314 * @gfp: type of the memory for the allocation
316 * Returns the new blob or NULL if there's no memory available
318 static struct task_smack *new_task_smack(struct smack_known *task,
319 struct smack_known *forked, gfp_t gfp)
321 struct task_smack *tsp;
323 tsp = kzalloc(sizeof(struct task_smack), gfp);
327 tsp->smk_task = task;
328 tsp->smk_forked = forked;
329 INIT_LIST_HEAD(&tsp->smk_rules);
330 INIT_LIST_HEAD(&tsp->smk_relabel);
331 mutex_init(&tsp->smk_rules_lock);
337 * smk_copy_rules - copy a rule set
338 * @nhead: new rules header pointer
339 * @ohead: old rules header pointer
340 * @gfp: type of the memory for the allocation
342 * Returns 0 on success, -ENOMEM on error
344 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
347 struct smack_rule *nrp;
348 struct smack_rule *orp;
351 list_for_each_entry_rcu(orp, ohead, list) {
352 nrp = kzalloc(sizeof(struct smack_rule), gfp);
358 list_add_rcu(&nrp->list, nhead);
364 * smk_copy_relabel - copy smk_relabel labels list
365 * @nhead: new rules header pointer
366 * @ohead: old rules header pointer
367 * @gfp: type of the memory for the allocation
369 * Returns 0 on success, -ENOMEM on error
371 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
374 struct smack_known_list_elem *nklep;
375 struct smack_known_list_elem *oklep;
377 list_for_each_entry(oklep, ohead, list) {
378 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
380 smk_destroy_label_list(nhead);
383 nklep->smk_label = oklep->smk_label;
384 list_add(&nklep->list, nhead);
391 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392 * @mode - input mode in form of PTRACE_MODE_*
394 * Returns a converted MAY_* mode usable by smack rules
396 static inline unsigned int smk_ptrace_mode(unsigned int mode)
398 if (mode & PTRACE_MODE_ATTACH)
399 return MAY_READWRITE;
400 if (mode & PTRACE_MODE_READ)
407 * smk_ptrace_rule_check - helper for ptrace access
408 * @tracer: tracer process
409 * @tracee_known: label entry of the process that's about to be traced
410 * @mode: ptrace attachment mode (PTRACE_MODE_*)
411 * @func: name of the function that called us, used for audit
413 * Returns 0 on access granted, -error on error
415 static int smk_ptrace_rule_check(struct task_struct *tracer,
416 struct smack_known *tracee_known,
417 unsigned int mode, const char *func)
420 struct smk_audit_info ad, *saip = NULL;
421 struct task_smack *tsp;
422 struct smack_known *tracer_known;
424 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
425 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
426 smk_ad_setfield_u_tsk(&ad, tracer);
431 tsp = __task_cred(tracer)->security;
432 tracer_known = smk_of_task(tsp);
434 if ((mode & PTRACE_MODE_ATTACH) &&
435 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
436 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
437 if (tracer_known->smk_known == tracee_known->smk_known)
439 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
441 else if (capable(CAP_SYS_PTRACE))
447 smack_log(tracer_known->smk_known,
448 tracee_known->smk_known,
455 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
456 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
464 * We he, that is fun!
468 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
469 * @ctp: child task pointer
470 * @mode: ptrace attachment mode (PTRACE_MODE_*)
472 * Returns 0 if access is OK, an error code otherwise
474 * Do the capability checks.
476 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
478 struct smack_known *skp;
480 skp = smk_of_task_struct(ctp);
482 return smk_ptrace_rule_check(current, skp, mode, __func__);
486 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487 * @ptp: parent task pointer
489 * Returns 0 if access is OK, an error code otherwise
491 * Do the capability checks, and require PTRACE_MODE_ATTACH.
493 static int smack_ptrace_traceme(struct task_struct *ptp)
496 struct smack_known *skp;
498 skp = smk_of_task(current_security());
500 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
505 * smack_syslog - Smack approval on syslog
506 * @type: message type
508 * Returns 0 on success, error code otherwise.
510 static int smack_syslog(int typefrom_file)
513 struct smack_known *skp = smk_of_current();
515 if (smack_privileged(CAP_MAC_OVERRIDE))
518 if (smack_syslog_label != NULL && smack_syslog_label != skp)
530 * smack_sb_alloc_security - allocate a superblock blob
531 * @sb: the superblock getting the blob
533 * Returns 0 on success or -ENOMEM on error.
535 static int smack_sb_alloc_security(struct super_block *sb)
537 struct superblock_smack *sbsp;
539 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
544 sbsp->smk_root = &smack_known_floor;
545 sbsp->smk_default = &smack_known_floor;
546 sbsp->smk_floor = &smack_known_floor;
547 sbsp->smk_hat = &smack_known_hat;
549 * SMK_SB_INITIALIZED will be zero from kzalloc.
551 sb->s_security = sbsp;
557 * smack_sb_free_security - free a superblock blob
558 * @sb: the superblock getting the blob
561 static void smack_sb_free_security(struct super_block *sb)
563 kfree(sb->s_security);
564 sb->s_security = NULL;
568 * smack_sb_copy_data - copy mount options data for processing
569 * @orig: where to start
570 * @smackopts: mount options string
572 * Returns 0 on success or -ENOMEM on error.
574 * Copy the Smack specific mount options out of the mount
577 static int smack_sb_copy_data(char *orig, char *smackopts)
579 char *cp, *commap, *otheropts, *dp;
581 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
582 if (otheropts == NULL)
585 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
586 if (strstr(cp, SMK_FSDEFAULT) == cp)
588 else if (strstr(cp, SMK_FSFLOOR) == cp)
590 else if (strstr(cp, SMK_FSHAT) == cp)
592 else if (strstr(cp, SMK_FSROOT) == cp)
594 else if (strstr(cp, SMK_FSTRANS) == cp)
599 commap = strchr(cp, ',');
608 strcpy(orig, otheropts);
609 free_page((unsigned long)otheropts);
615 * smack_parse_opts_str - parse Smack specific mount options
616 * @options: mount options string
617 * @opts: where to store converted mount opts
619 * Returns 0 on success or -ENOMEM on error.
621 * converts Smack specific mount options to generic security option format
623 static int smack_parse_opts_str(char *options,
624 struct security_mnt_opts *opts)
627 char *fsdefault = NULL;
628 char *fsfloor = NULL;
631 char *fstransmute = NULL;
633 int num_mnt_opts = 0;
636 opts->num_mnt_opts = 0;
641 while ((p = strsep(&options, ",")) != NULL) {
642 substring_t args[MAX_OPT_ARGS];
647 token = match_token(p, smk_mount_tokens, args);
653 fsdefault = match_strdup(&args[0]);
660 fsfloor = match_strdup(&args[0]);
667 fshat = match_strdup(&args[0]);
674 fsroot = match_strdup(&args[0]);
678 case Opt_fstransmute:
681 fstransmute = match_strdup(&args[0]);
687 pr_warn("Smack: unknown mount option\n");
692 opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL);
696 opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
698 if (!opts->mnt_opts_flags) {
699 kfree(opts->mnt_opts);
704 opts->mnt_opts[num_mnt_opts] = fsdefault;
705 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
708 opts->mnt_opts[num_mnt_opts] = fsfloor;
709 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
712 opts->mnt_opts[num_mnt_opts] = fshat;
713 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
716 opts->mnt_opts[num_mnt_opts] = fsroot;
717 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
720 opts->mnt_opts[num_mnt_opts] = fstransmute;
721 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
724 opts->num_mnt_opts = num_mnt_opts;
729 pr_warn("Smack: duplicate mount options\n");
741 * smack_set_mnt_opts - set Smack specific mount options
742 * @sb: the file system superblock
743 * @opts: Smack mount options
744 * @kern_flags: mount option from kernel space or user space
745 * @set_kern_flags: where to store converted mount opts
747 * Returns 0 on success, an error code on failure
749 * Allow filesystems with binary mount data to explicitly set Smack mount
752 static int smack_set_mnt_opts(struct super_block *sb,
753 struct security_mnt_opts *opts,
754 unsigned long kern_flags,
755 unsigned long *set_kern_flags)
757 struct dentry *root = sb->s_root;
758 struct inode *inode = d_backing_inode(root);
759 struct superblock_smack *sp = sb->s_security;
760 struct inode_smack *isp;
761 struct smack_known *skp;
763 int num_opts = opts->num_mnt_opts;
766 if (sp->smk_flags & SMK_SB_INITIALIZED)
769 if (!smack_privileged(CAP_MAC_ADMIN)) {
771 * Unprivileged mounts don't get to specify Smack values.
776 * Unprivileged mounts get root and default from the caller.
778 skp = smk_of_current();
780 sp->smk_default = skp;
782 * For a handful of fs types with no user-controlled
783 * backing store it's okay to trust security labels
784 * in the filesystem. The rest are untrusted.
786 if (sb->s_user_ns != &init_user_ns &&
787 sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
788 sb->s_magic != RAMFS_MAGIC) {
790 sp->smk_flags |= SMK_SB_UNTRUSTED;
794 sp->smk_flags |= SMK_SB_INITIALIZED;
796 for (i = 0; i < num_opts; i++) {
797 switch (opts->mnt_opts_flags[i]) {
799 skp = smk_import_entry(opts->mnt_opts[i], 0);
802 sp->smk_default = skp;
805 skp = smk_import_entry(opts->mnt_opts[i], 0);
811 skp = smk_import_entry(opts->mnt_opts[i], 0);
817 skp = smk_import_entry(opts->mnt_opts[i], 0);
823 skp = smk_import_entry(opts->mnt_opts[i], 0);
835 * Initialize the root inode.
837 isp = inode->i_security;
839 isp = new_inode_smack(sp->smk_root);
842 inode->i_security = isp;
844 isp->smk_inode = sp->smk_root;
847 isp->smk_flags |= SMK_INODE_TRANSMUTE;
853 * smack_sb_kern_mount - Smack specific mount processing
854 * @sb: the file system superblock
855 * @flags: the mount flags
856 * @data: the smack mount options
858 * Returns 0 on success, an error code on failure
860 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
863 char *options = data;
864 struct security_mnt_opts opts;
866 security_init_mnt_opts(&opts);
871 rc = smack_parse_opts_str(options, &opts);
876 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
879 security_free_mnt_opts(&opts);
884 * smack_sb_statfs - Smack check on statfs
885 * @dentry: identifies the file system in question
887 * Returns 0 if current can read the floor of the filesystem,
888 * and error code otherwise
890 static int smack_sb_statfs(struct dentry *dentry)
892 struct superblock_smack *sbp = dentry->d_sb->s_security;
894 struct smk_audit_info ad;
896 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
897 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
899 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
900 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
909 * smack_bprm_set_creds - set creds for exec
910 * @bprm: the exec information
912 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
914 static int smack_bprm_set_creds(struct linux_binprm *bprm)
916 struct inode *inode = file_inode(bprm->file);
917 struct task_smack *bsp = bprm->cred->security;
918 struct inode_smack *isp;
919 struct superblock_smack *sbsp;
922 if (bprm->cred_prepared)
925 isp = inode->i_security;
926 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
929 sbsp = inode->i_sb->s_security;
930 if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
931 isp->smk_task != sbsp->smk_root)
934 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
935 struct task_struct *tracer;
939 tracer = ptrace_parent(current);
940 if (likely(tracer != NULL))
941 rc = smk_ptrace_rule_check(tracer,
949 } else if (bprm->unsafe)
952 bsp->smk_task = isp->smk_task;
953 bprm->per_clear |= PER_CLEAR_ON_SETID;
959 * smack_bprm_committing_creds - Prepare to install the new credentials
962 * @bprm: binprm for exec
964 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
966 struct task_smack *bsp = bprm->cred->security;
968 if (bsp->smk_task != bsp->smk_forked)
969 current->pdeath_signal = 0;
973 * smack_bprm_secureexec - Return the decision to use secureexec.
974 * @bprm: binprm for exec
976 * Returns 0 on success.
978 static int smack_bprm_secureexec(struct linux_binprm *bprm)
980 struct task_smack *tsp = current_security();
982 if (tsp->smk_task != tsp->smk_forked)
993 * smack_inode_alloc_security - allocate an inode blob
994 * @inode: the inode in need of a blob
996 * Returns 0 if it gets a blob, -ENOMEM otherwise
998 static int smack_inode_alloc_security(struct inode *inode)
1000 struct smack_known *skp = smk_of_current();
1002 inode->i_security = new_inode_smack(skp);
1003 if (inode->i_security == NULL)
1009 * smack_inode_free_rcu - Free inode_smack blob from cache
1010 * @head: the rcu_head for getting inode_smack pointer
1012 * Call back function called from call_rcu() to free
1013 * the i_security blob pointer in inode
1015 static void smack_inode_free_rcu(struct rcu_head *head)
1017 struct inode_smack *issp;
1019 issp = container_of(head, struct inode_smack, smk_rcu);
1020 kmem_cache_free(smack_inode_cache, issp);
1024 * smack_inode_free_security - free an inode blob using call_rcu()
1025 * @inode: the inode with a blob
1027 * Clears the blob pointer in inode using RCU
1029 static void smack_inode_free_security(struct inode *inode)
1031 struct inode_smack *issp = inode->i_security;
1034 * The inode may still be referenced in a path walk and
1035 * a call to smack_inode_permission() can be made
1036 * after smack_inode_free_security() is called.
1037 * To avoid race condition free the i_security via RCU
1038 * and leave the current inode->i_security pointer intact.
1039 * The inode will be freed after the RCU grace period too.
1041 call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
1045 * smack_inode_init_security - copy out the smack from an inode
1046 * @inode: the newly created inode
1047 * @dir: containing directory object
1049 * @name: where to put the attribute name
1050 * @value: where to put the attribute value
1051 * @len: where to put the length of the attribute
1053 * Returns 0 if it all works out, -ENOMEM if there's no memory
1055 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1056 const struct qstr *qstr, const char **name,
1057 void **value, size_t *len)
1059 struct inode_smack *issp = inode->i_security;
1060 struct smack_known *skp = smk_of_current();
1061 struct smack_known *isp = smk_of_inode(inode);
1062 struct smack_known *dsp = smk_of_inode(dir);
1066 *name = XATTR_SMACK_SUFFIX;
1070 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1075 * If the access rule allows transmutation and
1076 * the directory requests transmutation then
1077 * by all means transmute.
1078 * Mark the inode as changed.
1080 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1081 smk_inode_transmutable(dir)) {
1083 issp->smk_flags |= SMK_INODE_CHANGED;
1086 *value = kstrdup(isp->smk_known, GFP_NOFS);
1090 *len = strlen(isp->smk_known);
1097 * smack_inode_link - Smack check on link
1098 * @old_dentry: the existing object
1100 * @new_dentry: the new object
1102 * Returns 0 if access is permitted, an error code otherwise
1104 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1105 struct dentry *new_dentry)
1107 struct smack_known *isp;
1108 struct smk_audit_info ad;
1111 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1112 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1114 isp = smk_of_inode(d_backing_inode(old_dentry));
1115 rc = smk_curacc(isp, MAY_WRITE, &ad);
1116 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1118 if (rc == 0 && d_is_positive(new_dentry)) {
1119 isp = smk_of_inode(d_backing_inode(new_dentry));
1120 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1121 rc = smk_curacc(isp, MAY_WRITE, &ad);
1122 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1129 * smack_inode_unlink - Smack check on inode deletion
1130 * @dir: containing directory object
1131 * @dentry: file to unlink
1133 * Returns 0 if current can write the containing directory
1134 * and the object, error code otherwise
1136 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1138 struct inode *ip = d_backing_inode(dentry);
1139 struct smk_audit_info ad;
1142 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1143 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1146 * You need write access to the thing you're unlinking
1148 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1149 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1152 * You also need write access to the containing directory
1154 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1155 smk_ad_setfield_u_fs_inode(&ad, dir);
1156 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1157 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1163 * smack_inode_rmdir - Smack check on directory deletion
1164 * @dir: containing directory object
1165 * @dentry: directory to unlink
1167 * Returns 0 if current can write the containing directory
1168 * and the directory, error code otherwise
1170 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1172 struct smk_audit_info ad;
1175 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1176 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1179 * You need write access to the thing you're removing
1181 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1182 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1185 * You also need write access to the containing directory
1187 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1188 smk_ad_setfield_u_fs_inode(&ad, dir);
1189 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1190 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1197 * smack_inode_rename - Smack check on rename
1198 * @old_inode: unused
1199 * @old_dentry: the old object
1200 * @new_inode: unused
1201 * @new_dentry: the new object
1203 * Read and write access is required on both the old and
1206 * Returns 0 if access is permitted, an error code otherwise
1208 static int smack_inode_rename(struct inode *old_inode,
1209 struct dentry *old_dentry,
1210 struct inode *new_inode,
1211 struct dentry *new_dentry)
1214 struct smack_known *isp;
1215 struct smk_audit_info ad;
1217 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1218 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1220 isp = smk_of_inode(d_backing_inode(old_dentry));
1221 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1222 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1224 if (rc == 0 && d_is_positive(new_dentry)) {
1225 isp = smk_of_inode(d_backing_inode(new_dentry));
1226 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1227 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1228 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1234 * smack_inode_permission - Smack version of permission()
1235 * @inode: the inode in question
1236 * @mask: the access requested
1238 * This is the important Smack hook.
1240 * Returns 0 if access is permitted, -EACCES otherwise
1242 static int smack_inode_permission(struct inode *inode, int mask)
1244 struct superblock_smack *sbsp = inode->i_sb->s_security;
1245 struct smk_audit_info ad;
1246 int no_block = mask & MAY_NOT_BLOCK;
1249 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1251 * No permission to check. Existence test. Yup, it's there.
1256 if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1257 if (smk_of_inode(inode) != sbsp->smk_root)
1261 /* May be droppable after audit */
1264 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1265 smk_ad_setfield_u_fs_inode(&ad, inode);
1266 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1267 rc = smk_bu_inode(inode, mask, rc);
1272 * smack_inode_setattr - Smack check for setting attributes
1273 * @dentry: the object
1274 * @iattr: for the force flag
1276 * Returns 0 if access is permitted, an error code otherwise
1278 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1280 struct smk_audit_info ad;
1284 * Need to allow for clearing the setuid bit.
1286 if (iattr->ia_valid & ATTR_FORCE)
1288 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1289 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1291 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1292 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1297 * smack_inode_getattr - Smack check for getting attributes
1298 * @mnt: vfsmount of the object
1299 * @dentry: the object
1301 * Returns 0 if access is permitted, an error code otherwise
1303 static int smack_inode_getattr(const struct path *path)
1305 struct smk_audit_info ad;
1306 struct inode *inode = d_backing_inode(path->dentry);
1309 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1310 smk_ad_setfield_u_fs_path(&ad, *path);
1311 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1312 rc = smk_bu_inode(inode, MAY_READ, rc);
1317 * smack_inode_setxattr - Smack check for setting xattrs
1318 * @dentry: the object
1319 * @name: name of the attribute
1320 * @value: value of the attribute
1321 * @size: size of the value
1324 * This protects the Smack attribute explicitly.
1326 * Returns 0 if access is permitted, an error code otherwise
1328 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1329 const void *value, size_t size, int flags)
1331 struct smk_audit_info ad;
1332 struct smack_known *skp;
1334 int check_import = 0;
1339 * Check label validity here so import won't fail in post_setxattr
1341 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1342 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1343 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1346 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1347 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1351 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1353 if (size != TRANS_TRUE_SIZE ||
1354 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1357 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1359 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1362 if (rc == 0 && check_import) {
1363 skp = size ? smk_import_entry(value, size) : NULL;
1366 else if (skp == NULL || (check_star &&
1367 (skp == &smack_known_star || skp == &smack_known_web)))
1371 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1372 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1375 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1376 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1383 * smack_inode_post_setxattr - Apply the Smack update approved above
1385 * @name: attribute name
1386 * @value: attribute value
1387 * @size: attribute size
1390 * Set the pointer in the inode blob to the entry found
1391 * in the master label list.
1393 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1394 const void *value, size_t size, int flags)
1396 struct smack_known *skp;
1397 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1399 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1400 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1404 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1405 skp = smk_import_entry(value, size);
1407 isp->smk_inode = skp;
1408 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1409 skp = smk_import_entry(value, size);
1411 isp->smk_task = skp;
1412 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1413 skp = smk_import_entry(value, size);
1415 isp->smk_mmap = skp;
1422 * smack_inode_getxattr - Smack check on getxattr
1423 * @dentry: the object
1426 * Returns 0 if access is permitted, an error code otherwise
1428 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1430 struct smk_audit_info ad;
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_READ, &ad);
1437 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1442 * smack_inode_removexattr - Smack check on removexattr
1443 * @dentry: the object
1444 * @name: name of the attribute
1446 * Removing the Smack attribute requires CAP_MAC_ADMIN
1448 * Returns 0 if access is permitted, an error code otherwise
1450 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1452 struct inode_smack *isp;
1453 struct smk_audit_info ad;
1456 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1457 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1458 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1459 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1460 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1461 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1462 if (!smack_privileged(CAP_MAC_ADMIN))
1465 rc = cap_inode_removexattr(dentry, name);
1470 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1471 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1473 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1474 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1478 isp = d_backing_inode(dentry)->i_security;
1480 * Don't do anything special for these.
1481 * XATTR_NAME_SMACKIPIN
1482 * XATTR_NAME_SMACKIPOUT
1484 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1485 struct super_block *sbp = dentry->d_sb;
1486 struct superblock_smack *sbsp = sbp->s_security;
1488 isp->smk_inode = sbsp->smk_default;
1489 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1490 isp->smk_task = NULL;
1491 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1492 isp->smk_mmap = NULL;
1493 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1494 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1500 * smack_inode_getsecurity - get smack xattrs
1501 * @inode: the object
1502 * @name: attribute name
1503 * @buffer: where to put the result
1506 * Returns the size of the attribute or an error code
1508 static int smack_inode_getsecurity(struct inode *inode,
1509 const char *name, void **buffer,
1512 struct socket_smack *ssp;
1513 struct socket *sock;
1514 struct super_block *sbp;
1515 struct inode *ip = (struct inode *)inode;
1516 struct smack_known *isp;
1520 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1521 isp = smk_of_inode(inode);
1522 ilen = strlen(isp->smk_known);
1523 *buffer = isp->smk_known;
1528 * The rest of the Smack xattrs are only on sockets.
1531 if (sbp->s_magic != SOCKFS_MAGIC)
1534 sock = SOCKET_I(ip);
1535 if (sock == NULL || sock->sk == NULL)
1538 ssp = sock->sk->sk_security;
1540 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1542 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1547 ilen = strlen(isp->smk_known);
1549 *buffer = isp->smk_known;
1558 * smack_inode_listsecurity - list the Smack attributes
1559 * @inode: the object
1560 * @buffer: where they go
1561 * @buffer_size: size of buffer
1563 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1566 int len = sizeof(XATTR_NAME_SMACK);
1568 if (buffer != NULL && len <= buffer_size)
1569 memcpy(buffer, XATTR_NAME_SMACK, len);
1575 * smack_inode_getsecid - Extract inode's security id
1576 * @inode: inode to extract the info from
1577 * @secid: where result will be saved
1579 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1581 struct inode_smack *isp = inode->i_security;
1583 *secid = isp->smk_inode->smk_secid;
1591 * There is no smack_file_permission hook
1593 * Should access checks be done on each read or write?
1594 * UNICOS and SELinux say yes.
1595 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1597 * I'll say no for now. Smack does not do the frequent
1598 * label changing that SELinux does.
1602 * smack_file_alloc_security - assign a file security blob
1605 * The security blob for a file is a pointer to the master
1606 * label list, so no allocation is done.
1608 * f_security is the owner security information. It
1609 * isn't used on file access checks, it's for send_sigio.
1613 static int smack_file_alloc_security(struct file *file)
1615 struct smack_known *skp = smk_of_current();
1617 file->f_security = skp;
1622 * smack_file_free_security - clear a file security blob
1625 * The security blob for a file is a pointer to the master
1626 * label list, so no memory is freed.
1628 static void smack_file_free_security(struct file *file)
1630 file->f_security = NULL;
1634 * smack_file_ioctl - Smack check on ioctls
1639 * Relies heavily on the correct use of the ioctl command conventions.
1641 * Returns 0 if allowed, error code otherwise
1643 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1647 struct smk_audit_info ad;
1648 struct inode *inode = file_inode(file);
1650 if (unlikely(IS_PRIVATE(inode)))
1653 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1654 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1656 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1657 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1658 rc = smk_bu_file(file, MAY_WRITE, rc);
1661 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1662 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1663 rc = smk_bu_file(file, MAY_READ, rc);
1670 * smack_file_lock - Smack check on file locking
1674 * Returns 0 if current has lock access, error code otherwise
1676 static int smack_file_lock(struct file *file, unsigned int cmd)
1678 struct smk_audit_info ad;
1680 struct inode *inode = file_inode(file);
1682 if (unlikely(IS_PRIVATE(inode)))
1685 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1686 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1687 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1688 rc = smk_bu_file(file, MAY_LOCK, rc);
1693 * smack_file_fcntl - Smack check on fcntl
1695 * @cmd: what action to check
1698 * Generally these operations are harmless.
1699 * File locking operations present an obvious mechanism
1700 * for passing information, so they require write access.
1702 * Returns 0 if current has access, error code otherwise
1704 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1707 struct smk_audit_info ad;
1709 struct inode *inode = file_inode(file);
1711 if (unlikely(IS_PRIVATE(inode)))
1719 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1720 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1721 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1722 rc = smk_bu_file(file, MAY_LOCK, rc);
1726 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1727 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1728 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1729 rc = smk_bu_file(file, MAY_WRITE, rc);
1740 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1741 * if mapping anonymous memory.
1742 * @file contains the file structure for file to map (may be NULL).
1743 * @reqprot contains the protection requested by the application.
1744 * @prot contains the protection that will be applied by the kernel.
1745 * @flags contains the operational flags.
1746 * Return 0 if permission is granted.
1748 static int smack_mmap_file(struct file *file,
1749 unsigned long reqprot, unsigned long prot,
1750 unsigned long flags)
1752 struct smack_known *skp;
1753 struct smack_known *mkp;
1754 struct smack_rule *srp;
1755 struct task_smack *tsp;
1756 struct smack_known *okp;
1757 struct inode_smack *isp;
1758 struct superblock_smack *sbsp;
1767 if (unlikely(IS_PRIVATE(file_inode(file))))
1770 isp = file_inode(file)->i_security;
1771 if (isp->smk_mmap == NULL)
1773 sbsp = file_inode(file)->i_sb->s_security;
1774 if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1775 isp->smk_mmap != sbsp->smk_root)
1777 mkp = isp->smk_mmap;
1779 tsp = current_security();
1780 skp = smk_of_current();
1785 * For each Smack rule associated with the subject
1786 * label verify that the SMACK64MMAP also has access
1787 * to that rule's object label.
1789 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1790 okp = srp->smk_object;
1792 * Matching labels always allows access.
1794 if (mkp->smk_known == okp->smk_known)
1797 * If there is a matching local rule take
1798 * that into account as well.
1800 may = smk_access_entry(srp->smk_subject->smk_known,
1804 may = srp->smk_access;
1806 may &= srp->smk_access;
1808 * If may is zero the SMACK64MMAP subject can't
1809 * possibly have less access.
1815 * Fetch the global list entry.
1816 * If there isn't one a SMACK64MMAP subject
1817 * can't have as much access as current.
1819 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1821 if (mmay == -ENOENT) {
1826 * If there is a local entry it modifies the
1827 * potential access, too.
1829 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1831 if (tmay != -ENOENT)
1835 * If there is any access available to current that is
1836 * not available to a SMACK64MMAP subject
1839 if ((may | mmay) != mmay) {
1851 * smack_file_set_fowner - set the file security blob value
1852 * @file: object in question
1855 static void smack_file_set_fowner(struct file *file)
1857 file->f_security = smk_of_current();
1861 * smack_file_send_sigiotask - Smack on sigio
1862 * @tsk: The target task
1863 * @fown: the object the signal come from
1866 * Allow a privileged task to get signals even if it shouldn't
1868 * Returns 0 if a subject with the object's smack could
1869 * write to the task, an error code otherwise.
1871 static int smack_file_send_sigiotask(struct task_struct *tsk,
1872 struct fown_struct *fown, int signum)
1874 struct smack_known *skp;
1875 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1878 struct smk_audit_info ad;
1881 * struct fown_struct is never outside the context of a struct file
1883 file = container_of(fown, struct file, f_owner);
1885 /* we don't log here as rc can be overriden */
1886 skp = file->f_security;
1887 rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1888 rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1889 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1892 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1893 smk_ad_setfield_u_tsk(&ad, tsk);
1894 smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1899 * smack_file_receive - Smack file receive check
1902 * Returns 0 if current has access, error code otherwise
1904 static int smack_file_receive(struct file *file)
1908 struct smk_audit_info ad;
1909 struct inode *inode = file_inode(file);
1910 struct socket *sock;
1911 struct task_smack *tsp;
1912 struct socket_smack *ssp;
1914 if (unlikely(IS_PRIVATE(inode)))
1917 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1918 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1920 if (S_ISSOCK(inode->i_mode)) {
1921 sock = SOCKET_I(inode);
1922 ssp = sock->sk->sk_security;
1923 tsp = current_security();
1925 * If the receiving process can't write to the
1926 * passed socket or if the passed socket can't
1927 * write to the receiving process don't accept
1928 * the passed socket.
1930 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1931 rc = smk_bu_file(file, may, rc);
1934 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1935 rc = smk_bu_file(file, may, rc);
1939 * This code relies on bitmasks.
1941 if (file->f_mode & FMODE_READ)
1943 if (file->f_mode & FMODE_WRITE)
1946 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1947 rc = smk_bu_file(file, may, rc);
1952 * smack_file_open - Smack dentry open processing
1954 * @cred: task credential
1956 * Set the security blob in the file structure.
1957 * Allow the open only if the task has read access. There are
1958 * many read operations (e.g. fstat) that you can do with an
1959 * fd even if you have the file open write-only.
1963 static int smack_file_open(struct file *file, const struct cred *cred)
1965 struct task_smack *tsp = cred->security;
1966 struct inode *inode = file_inode(file);
1967 struct smk_audit_info ad;
1970 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1971 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1972 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1973 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1983 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1984 * @new: the new credentials
1985 * @gfp: the atomicity of any memory allocations
1987 * Prepare a blank set of credentials for modification. This must allocate all
1988 * the memory the LSM module might require such that cred_transfer() can
1989 * complete without error.
1991 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1993 struct task_smack *tsp;
1995 tsp = new_task_smack(NULL, NULL, gfp);
1999 cred->security = tsp;
2006 * smack_cred_free - "free" task-level security credentials
2007 * @cred: the credentials in question
2010 static void smack_cred_free(struct cred *cred)
2012 struct task_smack *tsp = cred->security;
2013 struct smack_rule *rp;
2014 struct list_head *l;
2015 struct list_head *n;
2019 cred->security = NULL;
2021 smk_destroy_label_list(&tsp->smk_relabel);
2023 list_for_each_safe(l, n, &tsp->smk_rules) {
2024 rp = list_entry(l, struct smack_rule, list);
2025 list_del(&rp->list);
2032 * smack_cred_prepare - prepare new set of credentials for modification
2033 * @new: the new credentials
2034 * @old: the original credentials
2035 * @gfp: the atomicity of any memory allocations
2037 * Prepare a new set of credentials for modification.
2039 static int smack_cred_prepare(struct cred *new, const struct cred *old,
2042 struct task_smack *old_tsp = old->security;
2043 struct task_smack *new_tsp;
2046 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
2047 if (new_tsp == NULL)
2050 new->security = new_tsp;
2052 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2056 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2065 * smack_cred_transfer - Transfer the old credentials to the new credentials
2066 * @new: the new credentials
2067 * @old: the original credentials
2069 * Fill in a set of blank credentials from another set of credentials.
2071 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2073 struct task_smack *old_tsp = old->security;
2074 struct task_smack *new_tsp = new->security;
2076 new_tsp->smk_task = old_tsp->smk_task;
2077 new_tsp->smk_forked = old_tsp->smk_task;
2078 mutex_init(&new_tsp->smk_rules_lock);
2079 INIT_LIST_HEAD(&new_tsp->smk_rules);
2082 /* cbs copy rule list */
2086 * smack_kernel_act_as - Set the subjective context in a set of credentials
2087 * @new: points to the set of credentials to be modified.
2088 * @secid: specifies the security ID to be set
2090 * Set the security data for a kernel service.
2092 static int smack_kernel_act_as(struct cred *new, u32 secid)
2094 struct task_smack *new_tsp = new->security;
2096 new_tsp->smk_task = smack_from_secid(secid);
2101 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2102 * @new: points to the set of credentials to be modified
2103 * @inode: points to the inode to use as a reference
2105 * Set the file creation context in a set of credentials to the same
2106 * as the objective context of the specified inode
2108 static int smack_kernel_create_files_as(struct cred *new,
2109 struct inode *inode)
2111 struct inode_smack *isp = inode->i_security;
2112 struct task_smack *tsp = new->security;
2114 tsp->smk_forked = isp->smk_inode;
2115 tsp->smk_task = tsp->smk_forked;
2120 * smk_curacc_on_task - helper to log task related access
2121 * @p: the task object
2122 * @access: the access requested
2123 * @caller: name of the calling function for audit
2125 * Return 0 if access is permitted
2127 static int smk_curacc_on_task(struct task_struct *p, int access,
2130 struct smk_audit_info ad;
2131 struct smack_known *skp = smk_of_task_struct(p);
2134 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2135 smk_ad_setfield_u_tsk(&ad, p);
2136 rc = smk_curacc(skp, access, &ad);
2137 rc = smk_bu_task(p, access, rc);
2142 * smack_task_setpgid - Smack check on setting pgid
2143 * @p: the task object
2146 * Return 0 if write access is permitted
2148 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2150 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2154 * smack_task_getpgid - Smack access check for getpgid
2155 * @p: the object task
2157 * Returns 0 if current can read the object task, error code otherwise
2159 static int smack_task_getpgid(struct task_struct *p)
2161 return smk_curacc_on_task(p, MAY_READ, __func__);
2165 * smack_task_getsid - Smack access check for getsid
2166 * @p: the object task
2168 * Returns 0 if current can read the object task, error code otherwise
2170 static int smack_task_getsid(struct task_struct *p)
2172 return smk_curacc_on_task(p, MAY_READ, __func__);
2176 * smack_task_getsecid - get the secid of the task
2177 * @p: the object task
2178 * @secid: where to put the result
2180 * Sets the secid to contain a u32 version of the smack label.
2182 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2184 struct smack_known *skp = smk_of_task_struct(p);
2186 *secid = skp->smk_secid;
2190 * smack_task_setnice - Smack check on setting nice
2191 * @p: the task object
2194 * Return 0 if write access is permitted
2196 static int smack_task_setnice(struct task_struct *p, int nice)
2198 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2202 * smack_task_setioprio - Smack check on setting ioprio
2203 * @p: the task object
2206 * Return 0 if write access is permitted
2208 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2210 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2214 * smack_task_getioprio - Smack check on reading ioprio
2215 * @p: the task object
2217 * Return 0 if read access is permitted
2219 static int smack_task_getioprio(struct task_struct *p)
2221 return smk_curacc_on_task(p, MAY_READ, __func__);
2225 * smack_task_setscheduler - Smack check on setting scheduler
2226 * @p: the task object
2230 * Return 0 if read access is permitted
2232 static int smack_task_setscheduler(struct task_struct *p)
2234 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2238 * smack_task_getscheduler - Smack check on reading scheduler
2239 * @p: the task object
2241 * Return 0 if read access is permitted
2243 static int smack_task_getscheduler(struct task_struct *p)
2245 return smk_curacc_on_task(p, MAY_READ, __func__);
2249 * smack_task_movememory - Smack check on moving memory
2250 * @p: the task object
2252 * Return 0 if write access is permitted
2254 static int smack_task_movememory(struct task_struct *p)
2256 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2260 * smack_task_kill - Smack check on signal delivery
2261 * @p: the task object
2264 * @secid: identifies the smack to use in lieu of current's
2266 * Return 0 if write access is permitted
2268 * The secid behavior is an artifact of an SELinux hack
2269 * in the USB code. Someday it may go away.
2271 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2274 struct smk_audit_info ad;
2275 struct smack_known *skp;
2276 struct smack_known *tkp = smk_of_task_struct(p);
2280 return 0; /* null signal; existence test */
2282 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2283 smk_ad_setfield_u_tsk(&ad, p);
2285 * Sending a signal requires that the sender
2286 * can write the receiver.
2289 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2290 rc = smk_bu_task(p, MAY_DELIVER, rc);
2294 * If the secid isn't 0 we're dealing with some USB IO
2295 * specific behavior. This is not clean. For one thing
2296 * we can't take privilege into account.
2298 skp = smack_from_secid(secid);
2299 rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2300 rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2305 * smack_task_to_inode - copy task smack into the inode blob
2306 * @p: task to copy from
2307 * @inode: inode to copy to
2309 * Sets the smack pointer in the inode security blob
2311 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2313 struct inode_smack *isp = inode->i_security;
2314 struct smack_known *skp = smk_of_task_struct(p);
2316 isp->smk_inode = skp;
2324 * smack_sk_alloc_security - Allocate a socket blob
2327 * @gfp_flags: memory allocation flags
2329 * Assign Smack pointers to current
2331 * Returns 0 on success, -ENOMEM is there's no memory
2333 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2335 struct smack_known *skp = smk_of_current();
2336 struct socket_smack *ssp;
2338 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2343 * Sockets created by kernel threads receive web label.
2345 if (unlikely(current->flags & PF_KTHREAD)) {
2346 ssp->smk_in = &smack_known_web;
2347 ssp->smk_out = &smack_known_web;
2352 ssp->smk_packet = NULL;
2354 sk->sk_security = ssp;
2360 * smack_sk_free_security - Free a socket blob
2363 * Clears the blob pointer
2365 static void smack_sk_free_security(struct sock *sk)
2367 #ifdef SMACK_IPV6_PORT_LABELING
2368 struct smk_port_label *spp;
2370 if (sk->sk_family == PF_INET6) {
2372 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2373 if (spp->smk_sock != sk)
2375 spp->smk_can_reuse = 1;
2381 kfree(sk->sk_security);
2385 * smack_ipv4host_label - check host based restrictions
2386 * @sip: the object end
2388 * looks for host based access restrictions
2390 * This version will only be appropriate for really small sets of single label
2391 * hosts. The caller is responsible for ensuring that the RCU read lock is
2392 * taken before calling this function.
2394 * Returns the label of the far end or NULL if it's not special.
2396 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2398 struct smk_net4addr *snp;
2399 struct in_addr *siap = &sip->sin_addr;
2401 if (siap->s_addr == 0)
2404 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2406 * we break after finding the first match because
2407 * the list is sorted from longest to shortest mask
2408 * so we have found the most specific match
2410 if (snp->smk_host.s_addr ==
2411 (siap->s_addr & snp->smk_mask.s_addr))
2412 return snp->smk_label;
2417 #if IS_ENABLED(CONFIG_IPV6)
2419 * smk_ipv6_localhost - Check for local ipv6 host address
2422 * Returns boolean true if this is the localhost address
2424 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2426 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2427 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2429 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2430 ntohs(be16p[7]) == 1)
2436 * smack_ipv6host_label - check host based restrictions
2437 * @sip: the object end
2439 * looks for host based access restrictions
2441 * This version will only be appropriate for really small sets of single label
2442 * hosts. The caller is responsible for ensuring that the RCU read lock is
2443 * taken before calling this function.
2445 * Returns the label of the far end or NULL if it's not special.
2447 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2449 struct smk_net6addr *snp;
2450 struct in6_addr *sap = &sip->sin6_addr;
2455 * It's local. Don't look for a host label.
2457 if (smk_ipv6_localhost(sip))
2460 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2462 * If the label is NULL the entry has
2463 * been renounced. Ignore it.
2465 if (snp->smk_label == NULL)
2468 * we break after finding the first match because
2469 * the list is sorted from longest to shortest mask
2470 * so we have found the most specific match
2472 for (found = 1, i = 0; i < 8; i++) {
2473 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2474 snp->smk_host.s6_addr16[i]) {
2480 return snp->smk_label;
2485 #endif /* CONFIG_IPV6 */
2488 * smack_netlabel - Set the secattr on a socket
2490 * @labeled: socket label scheme
2492 * Convert the outbound smack value (smk_out) to a
2493 * secattr and attach it to the socket.
2495 * Returns 0 on success or an error code
2497 static int smack_netlabel(struct sock *sk, int labeled)
2499 struct smack_known *skp;
2500 struct socket_smack *ssp = sk->sk_security;
2504 * Usually the netlabel code will handle changing the
2505 * packet labeling based on the label.
2506 * The case of a single label host is different, because
2507 * a single label host should never get a labeled packet
2508 * even though the label is usually associated with a packet
2512 bh_lock_sock_nested(sk);
2514 if (ssp->smk_out == smack_net_ambient ||
2515 labeled == SMACK_UNLABELED_SOCKET)
2516 netlbl_sock_delattr(sk);
2519 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2529 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2531 * @sap: the destination address
2533 * Set the correct secattr for the given socket based on the destination
2534 * address and perform any outbound access checks needed.
2536 * Returns 0 on success or an error code.
2539 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2541 struct smack_known *skp;
2544 struct smack_known *hkp;
2545 struct socket_smack *ssp = sk->sk_security;
2546 struct smk_audit_info ad;
2549 hkp = smack_ipv4host_label(sap);
2552 struct lsm_network_audit net;
2554 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2555 ad.a.u.net->family = sap->sin_family;
2556 ad.a.u.net->dport = sap->sin_port;
2557 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2559 sk_lbl = SMACK_UNLABELED_SOCKET;
2561 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2562 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2564 sk_lbl = SMACK_CIPSO_SOCKET;
2571 return smack_netlabel(sk, sk_lbl);
2574 #if IS_ENABLED(CONFIG_IPV6)
2576 * smk_ipv6_check - check Smack access
2577 * @subject: subject Smack label
2578 * @object: object Smack label
2580 * @act: the action being taken
2582 * Check an IPv6 access
2584 static int smk_ipv6_check(struct smack_known *subject,
2585 struct smack_known *object,
2586 struct sockaddr_in6 *address, int act)
2589 struct lsm_network_audit net;
2591 struct smk_audit_info ad;
2595 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2596 ad.a.u.net->family = PF_INET6;
2597 ad.a.u.net->dport = ntohs(address->sin6_port);
2598 if (act == SMK_RECEIVING)
2599 ad.a.u.net->v6info.saddr = address->sin6_addr;
2601 ad.a.u.net->v6info.daddr = address->sin6_addr;
2603 rc = smk_access(subject, object, MAY_WRITE, &ad);
2604 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2607 #endif /* CONFIG_IPV6 */
2609 #ifdef SMACK_IPV6_PORT_LABELING
2611 * smk_ipv6_port_label - Smack port access table management
2615 * Create or update the port list entry
2617 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2619 struct sock *sk = sock->sk;
2620 struct sockaddr_in6 *addr6;
2621 struct socket_smack *ssp = sock->sk->sk_security;
2622 struct smk_port_label *spp;
2623 unsigned short port = 0;
2625 if (address == NULL) {
2627 * This operation is changing the Smack information
2628 * on the bound socket. Take the changes to the port
2632 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2633 if (sk != spp->smk_sock)
2635 spp->smk_in = ssp->smk_in;
2636 spp->smk_out = ssp->smk_out;
2641 * A NULL address is only used for updating existing
2642 * bound entries. If there isn't one, it's OK.
2648 addr6 = (struct sockaddr_in6 *)address;
2649 port = ntohs(addr6->sin6_port);
2651 * This is a special case that is safely ignored.
2657 * Look for an existing port list entry.
2658 * This is an indication that a port is getting reused.
2661 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2662 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2664 if (spp->smk_can_reuse != 1) {
2668 spp->smk_port = port;
2670 spp->smk_in = ssp->smk_in;
2671 spp->smk_out = ssp->smk_out;
2672 spp->smk_can_reuse = 0;
2678 * A new port entry is required.
2680 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2684 spp->smk_port = port;
2686 spp->smk_in = ssp->smk_in;
2687 spp->smk_out = ssp->smk_out;
2688 spp->smk_sock_type = sock->type;
2689 spp->smk_can_reuse = 0;
2691 mutex_lock(&smack_ipv6_lock);
2692 list_add_rcu(&spp->list, &smk_ipv6_port_list);
2693 mutex_unlock(&smack_ipv6_lock);
2698 * smk_ipv6_port_check - check Smack port access
2702 * Create or update the port list entry
2704 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2707 struct smk_port_label *spp;
2708 struct socket_smack *ssp = sk->sk_security;
2709 struct smack_known *skp = NULL;
2710 unsigned short port;
2711 struct smack_known *object;
2713 if (act == SMK_RECEIVING) {
2714 skp = smack_ipv6host_label(address);
2715 object = ssp->smk_in;
2718 object = smack_ipv6host_label(address);
2722 * The other end is a single label host.
2724 if (skp != NULL && object != NULL)
2725 return smk_ipv6_check(skp, object, address, act);
2727 skp = smack_net_ambient;
2729 object = smack_net_ambient;
2732 * It's remote, so port lookup does no good.
2734 if (!smk_ipv6_localhost(address))
2735 return smk_ipv6_check(skp, object, address, act);
2738 * It's local so the send check has to have passed.
2740 if (act == SMK_RECEIVING)
2743 port = ntohs(address->sin6_port);
2745 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2746 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2748 object = spp->smk_in;
2749 if (act == SMK_CONNECTING)
2750 ssp->smk_packet = spp->smk_out;
2755 return smk_ipv6_check(skp, object, address, act);
2757 #endif /* SMACK_IPV6_PORT_LABELING */
2760 * smack_inode_setsecurity - set smack xattrs
2761 * @inode: the object
2762 * @name: attribute name
2763 * @value: attribute value
2764 * @size: size of the attribute
2767 * Sets the named attribute in the appropriate blob
2769 * Returns 0 on success, or an error code
2771 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2772 const void *value, size_t size, int flags)
2774 struct smack_known *skp;
2775 struct inode_smack *nsp = inode->i_security;
2776 struct socket_smack *ssp;
2777 struct socket *sock;
2780 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2783 skp = smk_import_entry(value, size);
2785 return PTR_ERR(skp);
2787 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2788 nsp->smk_inode = skp;
2789 nsp->smk_flags |= SMK_INODE_INSTANT;
2793 * The rest of the Smack xattrs are only on sockets.
2795 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2798 sock = SOCKET_I(inode);
2799 if (sock == NULL || sock->sk == NULL)
2802 ssp = sock->sk->sk_security;
2804 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2806 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2808 if (sock->sk->sk_family == PF_INET) {
2809 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2812 "Smack: \"%s\" netlbl error %d.\n",
2818 #ifdef SMACK_IPV6_PORT_LABELING
2819 if (sock->sk->sk_family == PF_INET6)
2820 smk_ipv6_port_label(sock, NULL);
2827 * smack_socket_post_create - finish socket setup
2829 * @family: protocol family
2834 * Sets the netlabel information on the socket
2836 * Returns 0 on success, and error code otherwise
2838 static int smack_socket_post_create(struct socket *sock, int family,
2839 int type, int protocol, int kern)
2841 struct socket_smack *ssp;
2843 if (sock->sk == NULL)
2847 * Sockets created by kernel threads receive web label.
2849 if (unlikely(current->flags & PF_KTHREAD)) {
2850 ssp = sock->sk->sk_security;
2851 ssp->smk_in = &smack_known_web;
2852 ssp->smk_out = &smack_known_web;
2855 if (family != PF_INET)
2858 * Set the outbound netlbl.
2860 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2863 #ifdef SMACK_IPV6_PORT_LABELING
2865 * smack_socket_bind - record port binding information.
2867 * @address: the port address
2868 * @addrlen: size of the address
2870 * Records the label bound to a port.
2874 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2877 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2878 smk_ipv6_port_label(sock, address);
2881 #endif /* SMACK_IPV6_PORT_LABELING */
2884 * smack_socket_connect - connect access check
2886 * @sap: the other end
2887 * @addrlen: size of sap
2889 * Verifies that a connection may be possible
2891 * Returns 0 on success, and error code otherwise
2893 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2897 #if IS_ENABLED(CONFIG_IPV6)
2898 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2900 #ifdef SMACK_IPV6_SECMARK_LABELING
2901 struct smack_known *rsp;
2902 struct socket_smack *ssp = sock->sk->sk_security;
2905 if (sock->sk == NULL)
2908 switch (sock->sk->sk_family) {
2910 if (addrlen < sizeof(struct sockaddr_in))
2912 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2915 if (addrlen < sizeof(struct sockaddr_in6))
2917 #ifdef SMACK_IPV6_SECMARK_LABELING
2918 rsp = smack_ipv6host_label(sip);
2920 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2923 #ifdef SMACK_IPV6_PORT_LABELING
2924 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2932 * smack_flags_to_may - convert S_ to MAY_ values
2933 * @flags: the S_ value
2935 * Returns the equivalent MAY_ value
2937 static int smack_flags_to_may(int flags)
2941 if (flags & S_IRUGO)
2943 if (flags & S_IWUGO)
2945 if (flags & S_IXUGO)
2952 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2957 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2959 struct smack_known *skp = smk_of_current();
2961 msg->security = skp;
2966 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2969 * Clears the blob pointer
2971 static void smack_msg_msg_free_security(struct msg_msg *msg)
2973 msg->security = NULL;
2977 * smack_of_shm - the smack pointer for the shm
2980 * Returns a pointer to the smack value
2982 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2984 return (struct smack_known *)shp->shm_perm.security;
2988 * smack_shm_alloc_security - Set the security blob for shm
2993 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2995 struct kern_ipc_perm *isp = &shp->shm_perm;
2996 struct smack_known *skp = smk_of_current();
2998 isp->security = skp;
3003 * smack_shm_free_security - Clear the security blob for shm
3006 * Clears the blob pointer
3008 static void smack_shm_free_security(struct shmid_kernel *shp)
3010 struct kern_ipc_perm *isp = &shp->shm_perm;
3012 isp->security = NULL;
3016 * smk_curacc_shm : check if current has access on shm
3018 * @access : access requested
3020 * Returns 0 if current has the requested access, error code otherwise
3022 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
3024 struct smack_known *ssp = smack_of_shm(shp);
3025 struct smk_audit_info ad;
3029 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3030 ad.a.u.ipc_id = shp->shm_perm.id;
3032 rc = smk_curacc(ssp, access, &ad);
3033 rc = smk_bu_current("shm", ssp, access, rc);
3038 * smack_shm_associate - Smack access check for shm
3040 * @shmflg: access requested
3042 * Returns 0 if current has the requested access, error code otherwise
3044 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
3048 may = smack_flags_to_may(shmflg);
3049 return smk_curacc_shm(shp, may);
3053 * smack_shm_shmctl - Smack access check for shm
3055 * @cmd: what it wants to do
3057 * Returns 0 if current has the requested access, error code otherwise
3059 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3072 may = MAY_READWRITE;
3077 * System level information.
3083 return smk_curacc_shm(shp, may);
3087 * smack_shm_shmat - Smack access for shmat
3090 * @shmflg: access requested
3092 * Returns 0 if current has the requested access, error code otherwise
3094 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3099 may = smack_flags_to_may(shmflg);
3100 return smk_curacc_shm(shp, may);
3104 * smack_of_sem - the smack pointer for the sem
3107 * Returns a pointer to the smack value
3109 static struct smack_known *smack_of_sem(struct sem_array *sma)
3111 return (struct smack_known *)sma->sem_perm.security;
3115 * smack_sem_alloc_security - Set the security blob for sem
3120 static int smack_sem_alloc_security(struct sem_array *sma)
3122 struct kern_ipc_perm *isp = &sma->sem_perm;
3123 struct smack_known *skp = smk_of_current();
3125 isp->security = skp;
3130 * smack_sem_free_security - Clear the security blob for sem
3133 * Clears the blob pointer
3135 static void smack_sem_free_security(struct sem_array *sma)
3137 struct kern_ipc_perm *isp = &sma->sem_perm;
3139 isp->security = NULL;
3143 * smk_curacc_sem : check if current has access on sem
3145 * @access : access requested
3147 * Returns 0 if current has the requested access, error code otherwise
3149 static int smk_curacc_sem(struct sem_array *sma, int access)
3151 struct smack_known *ssp = smack_of_sem(sma);
3152 struct smk_audit_info ad;
3156 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3157 ad.a.u.ipc_id = sma->sem_perm.id;
3159 rc = smk_curacc(ssp, access, &ad);
3160 rc = smk_bu_current("sem", ssp, access, rc);
3165 * smack_sem_associate - Smack access check for sem
3167 * @semflg: access requested
3169 * Returns 0 if current has the requested access, error code otherwise
3171 static int smack_sem_associate(struct sem_array *sma, int semflg)
3175 may = smack_flags_to_may(semflg);
3176 return smk_curacc_sem(sma, may);
3180 * smack_sem_shmctl - Smack access check for sem
3182 * @cmd: what it wants to do
3184 * Returns 0 if current has the requested access, error code otherwise
3186 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3204 may = MAY_READWRITE;
3209 * System level information
3216 return smk_curacc_sem(sma, may);
3220 * smack_sem_semop - Smack checks of semaphore operations
3226 * Treated as read and write in all cases.
3228 * Returns 0 if access is allowed, error code otherwise
3230 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3231 unsigned nsops, int alter)
3233 return smk_curacc_sem(sma, MAY_READWRITE);
3237 * smack_msg_alloc_security - Set the security blob for msg
3242 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3244 struct kern_ipc_perm *kisp = &msq->q_perm;
3245 struct smack_known *skp = smk_of_current();
3247 kisp->security = skp;
3252 * smack_msg_free_security - Clear the security blob for msg
3255 * Clears the blob pointer
3257 static void smack_msg_queue_free_security(struct msg_queue *msq)
3259 struct kern_ipc_perm *kisp = &msq->q_perm;
3261 kisp->security = NULL;
3265 * smack_of_msq - the smack pointer for the msq
3268 * Returns a pointer to the smack label entry
3270 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3272 return (struct smack_known *)msq->q_perm.security;
3276 * smk_curacc_msq : helper to check if current has access on msq
3278 * @access : access requested
3280 * return 0 if current has access, error otherwise
3282 static int smk_curacc_msq(struct msg_queue *msq, int access)
3284 struct smack_known *msp = smack_of_msq(msq);
3285 struct smk_audit_info ad;
3289 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3290 ad.a.u.ipc_id = msq->q_perm.id;
3292 rc = smk_curacc(msp, access, &ad);
3293 rc = smk_bu_current("msq", msp, access, rc);
3298 * smack_msg_queue_associate - Smack access check for msg_queue
3300 * @msqflg: access requested
3302 * Returns 0 if current has the requested access, error code otherwise
3304 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3308 may = smack_flags_to_may(msqflg);
3309 return smk_curacc_msq(msq, may);
3313 * smack_msg_queue_msgctl - Smack access check for msg_queue
3315 * @cmd: what it wants to do
3317 * Returns 0 if current has the requested access, error code otherwise
3319 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3330 may = MAY_READWRITE;
3335 * System level information
3342 return smk_curacc_msq(msq, may);
3346 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3349 * @msqflg: access requested
3351 * Returns 0 if current has the requested access, error code otherwise
3353 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3358 may = smack_flags_to_may(msqflg);
3359 return smk_curacc_msq(msq, may);
3363 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3370 * Returns 0 if current has read and write access, error code otherwise
3372 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3373 struct task_struct *target, long type, int mode)
3375 return smk_curacc_msq(msq, MAY_READWRITE);
3379 * smack_ipc_permission - Smack access for ipc_permission()
3380 * @ipp: the object permissions
3381 * @flag: access requested
3383 * Returns 0 if current has read and write access, error code otherwise
3385 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3387 struct smack_known *iskp = ipp->security;
3388 int may = smack_flags_to_may(flag);
3389 struct smk_audit_info ad;
3393 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3394 ad.a.u.ipc_id = ipp->id;
3396 rc = smk_curacc(iskp, may, &ad);
3397 rc = smk_bu_current("svipc", iskp, may, rc);
3402 * smack_ipc_getsecid - Extract smack security id
3403 * @ipp: the object permissions
3404 * @secid: where result will be saved
3406 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3408 struct smack_known *iskp = ipp->security;
3410 *secid = iskp->smk_secid;
3414 * smack_d_instantiate - Make sure the blob is correct on an inode
3415 * @opt_dentry: dentry where inode will be attached
3416 * @inode: the object
3418 * Set the inode's security blob if it hasn't been done already.
3420 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3422 struct super_block *sbp;
3423 struct superblock_smack *sbsp;
3424 struct inode_smack *isp;
3425 struct smack_known *skp;
3426 struct smack_known *ckp = smk_of_current();
3427 struct smack_known *final;
3428 char trattr[TRANS_TRUE_SIZE];
3436 isp = inode->i_security;
3438 mutex_lock(&isp->smk_lock);
3440 * If the inode is already instantiated
3441 * take the quick way out
3443 if (isp->smk_flags & SMK_INODE_INSTANT)
3447 sbsp = sbp->s_security;
3449 * We're going to use the superblock default label
3450 * if there's no label on the file.
3452 final = sbsp->smk_default;
3455 * If this is the root inode the superblock
3456 * may be in the process of initialization.
3457 * If that is the case use the root value out
3458 * of the superblock.
3460 if (opt_dentry->d_parent == opt_dentry) {
3461 switch (sbp->s_magic) {
3462 case CGROUP_SUPER_MAGIC:
3464 * The cgroup filesystem is never mounted,
3465 * so there's no opportunity to set the mount
3468 sbsp->smk_root = &smack_known_star;
3469 sbsp->smk_default = &smack_known_star;
3470 isp->smk_inode = sbsp->smk_root;
3474 * What about shmem/tmpfs anonymous files with dentry
3475 * obtained from d_alloc_pseudo()?
3477 isp->smk_inode = smk_of_current();
3480 isp->smk_inode = smk_of_current();
3484 * Socket access is controlled by the socket
3485 * structures associated with the task involved.
3487 isp->smk_inode = &smack_known_star;
3490 isp->smk_inode = sbsp->smk_root;
3493 isp->smk_flags |= SMK_INODE_INSTANT;
3498 * This is pretty hackish.
3499 * Casey says that we shouldn't have to do
3500 * file system specific code, but it does help
3501 * with keeping it simple.
3503 switch (sbp->s_magic) {
3505 case CGROUP_SUPER_MAGIC:
3507 * Casey says that it's a little embarrassing
3508 * that the smack file system doesn't do
3509 * extended attributes.
3511 * Cgroupfs is special
3513 final = &smack_known_star;
3515 case DEVPTS_SUPER_MAGIC:
3517 * devpts seems content with the label of the task.
3518 * Programs that change smack have to treat the
3523 case PROC_SUPER_MAGIC:
3525 * Casey says procfs appears not to care.
3526 * The superblock default suffices.
3531 * Device labels should come from the filesystem,
3532 * but watch out, because they're volitile,
3533 * getting recreated on every reboot.
3535 final = &smack_known_star;
3539 * If a smack value has been set we want to use it,
3540 * but since tmpfs isn't giving us the opportunity
3541 * to set mount options simulate setting the
3542 * superblock default.
3546 * This isn't an understood special case.
3547 * Get the value from the xattr.
3551 * UNIX domain sockets use lower level socket data.
3553 if (S_ISSOCK(inode->i_mode)) {
3554 final = &smack_known_star;
3558 * No xattr support means, alas, no SMACK label.
3559 * Use the aforeapplied default.
3560 * It would be curious if the label of the task
3561 * does not match that assigned.
3563 if (!(inode->i_opflags & IOP_XATTR))
3566 * Get the dentry for xattr.
3568 dp = dget(opt_dentry);
3569 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3570 if (!IS_ERR_OR_NULL(skp))
3574 * Transmuting directory
3576 if (S_ISDIR(inode->i_mode)) {
3578 * If this is a new directory and the label was
3579 * transmuted when the inode was initialized
3580 * set the transmute attribute on the directory
3581 * and mark the inode.
3583 * If there is a transmute attribute on the
3584 * directory mark the inode.
3586 if (isp->smk_flags & SMK_INODE_CHANGED) {
3587 isp->smk_flags &= ~SMK_INODE_CHANGED;
3588 rc = __vfs_setxattr(dp, inode,
3589 XATTR_NAME_SMACKTRANSMUTE,
3590 TRANS_TRUE, TRANS_TRUE_SIZE,
3593 rc = __vfs_getxattr(dp, inode,
3594 XATTR_NAME_SMACKTRANSMUTE, trattr,
3596 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3597 TRANS_TRUE_SIZE) != 0)
3601 transflag = SMK_INODE_TRANSMUTE;
3604 * Don't let the exec or mmap label be "*" or "@".
3606 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3607 if (IS_ERR(skp) || skp == &smack_known_star ||
3608 skp == &smack_known_web)
3610 isp->smk_task = skp;
3612 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3613 if (IS_ERR(skp) || skp == &smack_known_star ||
3614 skp == &smack_known_web)
3616 isp->smk_mmap = skp;
3623 isp->smk_inode = ckp;
3625 isp->smk_inode = final;
3627 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3630 mutex_unlock(&isp->smk_lock);
3635 * smack_getprocattr - Smack process attribute access
3636 * @p: the object task
3637 * @name: the name of the attribute in /proc/.../attr
3638 * @value: where to put the result
3640 * Places a copy of the task Smack into value
3642 * Returns the length of the smack label or an error code
3644 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3646 struct smack_known *skp = smk_of_task_struct(p);
3650 if (strcmp(name, "current") != 0)
3653 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3663 * smack_setprocattr - Smack process attribute setting
3664 * @name: the name of the attribute in /proc/.../attr
3665 * @value: the value to set
3666 * @size: the size of the value
3668 * Sets the Smack value of the task. Only setting self
3669 * is permitted and only with privilege
3671 * Returns the length of the smack label or an error code
3673 static int smack_setprocattr(const char *name, void *value, size_t size)
3675 struct task_smack *tsp = current_security();
3677 struct smack_known *skp;
3678 struct smack_known_list_elem *sklep;
3681 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3684 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3687 if (strcmp(name, "current") != 0)
3690 skp = smk_import_entry(value, size);
3692 return PTR_ERR(skp);
3695 * No process is ever allowed the web ("@") label
3696 * and the star ("*") label.
3698 if (skp == &smack_known_web || skp == &smack_known_star)
3701 if (!smack_privileged(CAP_MAC_ADMIN)) {
3703 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3704 if (sklep->smk_label == skp) {
3712 new = prepare_creds();
3716 tsp = new->security;
3717 tsp->smk_task = skp;
3719 * process can change its label only once
3721 smk_destroy_label_list(&tsp->smk_relabel);
3728 * smack_unix_stream_connect - Smack access on UDS
3730 * @other: the other sock
3733 * Return 0 if a subject with the smack of sock could access
3734 * an object with the smack of other, otherwise an error code
3736 static int smack_unix_stream_connect(struct sock *sock,
3737 struct sock *other, struct sock *newsk)
3739 struct smack_known *skp;
3740 struct smack_known *okp;
3741 struct socket_smack *ssp = sock->sk_security;
3742 struct socket_smack *osp = other->sk_security;
3743 struct socket_smack *nsp = newsk->sk_security;
3744 struct smk_audit_info ad;
3747 struct lsm_network_audit net;
3750 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3754 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3755 smk_ad_setfield_u_net_sk(&ad, other);
3757 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3758 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3762 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3763 rc = smk_bu_note("UDS connect", okp, skp,
3769 * Cross reference the peer labels for SO_PEERSEC.
3772 nsp->smk_packet = ssp->smk_out;
3773 ssp->smk_packet = osp->smk_out;
3780 * smack_unix_may_send - Smack access on UDS
3782 * @other: the other socket
3784 * Return 0 if a subject with the smack of sock could access
3785 * an object with the smack of other, otherwise an error code
3787 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3789 struct socket_smack *ssp = sock->sk->sk_security;
3790 struct socket_smack *osp = other->sk->sk_security;
3791 struct smk_audit_info ad;
3795 struct lsm_network_audit net;
3797 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3798 smk_ad_setfield_u_net_sk(&ad, other->sk);
3801 if (smack_privileged(CAP_MAC_OVERRIDE))
3804 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3805 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3810 * smack_socket_sendmsg - Smack check based on destination host
3813 * @size: the size of the message
3815 * Return 0 if the current subject can write to the destination host.
3816 * For IPv4 this is only a question if the destination is a single label host.
3817 * For IPv6 this is a check against the label of the port.
3819 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3822 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3823 #if IS_ENABLED(CONFIG_IPV6)
3824 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3826 #ifdef SMACK_IPV6_SECMARK_LABELING
3827 struct socket_smack *ssp = sock->sk->sk_security;
3828 struct smack_known *rsp;
3833 * Perfectly reasonable for this to be NULL
3838 switch (sock->sk->sk_family) {
3840 rc = smack_netlabel_send(sock->sk, sip);
3843 #ifdef SMACK_IPV6_SECMARK_LABELING
3844 rsp = smack_ipv6host_label(sap);
3846 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3849 #ifdef SMACK_IPV6_PORT_LABELING
3850 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3858 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3859 * @sap: netlabel secattr
3860 * @ssp: socket security information
3862 * Returns a pointer to a Smack label entry found on the label list.
3864 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3865 struct socket_smack *ssp)
3867 struct smack_known *skp;
3872 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3874 * Looks like a CIPSO packet.
3875 * If there are flags but no level netlabel isn't
3876 * behaving the way we expect it to.
3878 * Look it up in the label table
3879 * Without guidance regarding the smack value
3880 * for the packet fall back on the network
3884 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3885 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3888 * Compare the catsets. Use the netlbl APIs.
3890 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3891 if ((skp->smk_netlabel.flags &
3892 NETLBL_SECATTR_MLS_CAT) == 0)
3896 for (acat = -1, kcat = -1; acat == kcat; ) {
3897 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3899 kcat = netlbl_catmap_walk(
3900 skp->smk_netlabel.attr.mls.cat,
3902 if (acat < 0 || kcat < 0)
3915 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3916 return &smack_known_web;
3917 return &smack_known_star;
3919 if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3921 * Looks like a fallback, which gives us a secid.
3923 return smack_from_secid(sap->attr.secid);
3925 * Without guidance regarding the smack value
3926 * for the packet fall back on the network
3929 return smack_net_ambient;
3932 #if IS_ENABLED(CONFIG_IPV6)
3933 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3937 int proto = -EINVAL;
3938 struct ipv6hdr _ipv6h;
3939 struct ipv6hdr *ip6;
3941 struct tcphdr _tcph, *th;
3942 struct udphdr _udph, *uh;
3943 struct dccp_hdr _dccph, *dh;
3947 offset = skb_network_offset(skb);
3948 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3951 sip->sin6_addr = ip6->saddr;
3953 nexthdr = ip6->nexthdr;
3954 offset += sizeof(_ipv6h);
3955 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3962 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3964 sip->sin6_port = th->source;
3967 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3969 sip->sin6_port = uh->source;
3972 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3974 sip->sin6_port = dh->dccph_sport;
3979 #endif /* CONFIG_IPV6 */
3982 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3986 * Returns 0 if the packet should be delivered, an error code otherwise
3988 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3990 struct netlbl_lsm_secattr secattr;
3991 struct socket_smack *ssp = sk->sk_security;
3992 struct smack_known *skp = NULL;
3994 struct smk_audit_info ad;
3996 struct lsm_network_audit net;
3998 #if IS_ENABLED(CONFIG_IPV6)
3999 struct sockaddr_in6 sadd;
4001 #endif /* CONFIG_IPV6 */
4003 switch (sk->sk_family) {
4005 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4007 * If there is a secmark use it rather than the CIPSO label.
4008 * If there is no secmark fall back to CIPSO.
4009 * The secmark is assumed to reflect policy better.
4011 if (skb && skb->secmark != 0) {
4012 skp = smack_from_secid(skb->secmark);
4015 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4017 * Translate what netlabel gave us.
4019 netlbl_secattr_init(&secattr);
4021 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
4023 skp = smack_from_secattr(&secattr, ssp);
4025 skp = smack_net_ambient;
4027 netlbl_secattr_destroy(&secattr);
4029 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4033 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4034 ad.a.u.net->family = sk->sk_family;
4035 ad.a.u.net->netif = skb->skb_iif;
4036 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4039 * Receiving a packet requires that the other end
4040 * be able to write here. Read access is not required.
4041 * This is the simplist possible security model
4044 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4045 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
4048 netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
4050 #if IS_ENABLED(CONFIG_IPV6)
4052 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4053 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4055 #ifdef SMACK_IPV6_SECMARK_LABELING
4056 if (skb && skb->secmark != 0)
4057 skp = smack_from_secid(skb->secmark);
4059 skp = smack_ipv6host_label(&sadd);
4061 skp = smack_net_ambient;
4063 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4064 ad.a.u.net->family = sk->sk_family;
4065 ad.a.u.net->netif = skb->skb_iif;
4066 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4067 #endif /* CONFIG_AUDIT */
4068 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4069 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4071 #endif /* SMACK_IPV6_SECMARK_LABELING */
4072 #ifdef SMACK_IPV6_PORT_LABELING
4073 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4074 #endif /* SMACK_IPV6_PORT_LABELING */
4076 #endif /* CONFIG_IPV6 */
4083 * smack_socket_getpeersec_stream - pull in packet label
4085 * @optval: user's destination
4086 * @optlen: size thereof
4089 * returns zero on success, an error code otherwise
4091 static int smack_socket_getpeersec_stream(struct socket *sock,
4092 char __user *optval,
4093 int __user *optlen, unsigned len)
4095 struct socket_smack *ssp;
4100 ssp = sock->sk->sk_security;
4101 if (ssp->smk_packet != NULL) {
4102 rcp = ssp->smk_packet->smk_known;
4103 slen = strlen(rcp) + 1;
4108 else if (copy_to_user(optval, rcp, slen) != 0)
4111 if (put_user(slen, optlen) != 0)
4119 * smack_socket_getpeersec_dgram - pull in packet label
4120 * @sock: the peer socket
4122 * @secid: pointer to where to put the secid of the packet
4124 * Sets the netlabel socket state on sk from parent
4126 static int smack_socket_getpeersec_dgram(struct socket *sock,
4127 struct sk_buff *skb, u32 *secid)
4130 struct netlbl_lsm_secattr secattr;
4131 struct socket_smack *ssp = NULL;
4132 struct smack_known *skp;
4133 int family = PF_UNSPEC;
4134 u32 s = 0; /* 0 is the invalid secid */
4138 if (skb->protocol == htons(ETH_P_IP))
4140 #if IS_ENABLED(CONFIG_IPV6)
4141 else if (skb->protocol == htons(ETH_P_IPV6))
4143 #endif /* CONFIG_IPV6 */
4145 if (family == PF_UNSPEC && sock != NULL)
4146 family = sock->sk->sk_family;
4150 ssp = sock->sk->sk_security;
4151 s = ssp->smk_out->smk_secid;
4154 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4160 * Translate what netlabel gave us.
4162 if (sock != NULL && sock->sk != NULL)
4163 ssp = sock->sk->sk_security;
4164 netlbl_secattr_init(&secattr);
4165 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4167 skp = smack_from_secattr(&secattr, ssp);
4170 netlbl_secattr_destroy(&secattr);
4173 #ifdef SMACK_IPV6_SECMARK_LABELING
4185 * smack_sock_graft - Initialize a newly created socket with an existing sock
4187 * @parent: parent socket
4189 * Set the smk_{in,out} state of an existing sock based on the process that
4190 * is creating the new socket.
4192 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4194 struct socket_smack *ssp;
4195 struct smack_known *skp = smk_of_current();
4198 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4201 ssp = sk->sk_security;
4204 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4208 * smack_inet_conn_request - Smack access check on connect
4209 * @sk: socket involved
4213 * Returns 0 if a task with the packet label could write to
4214 * the socket, otherwise an error code
4216 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4217 struct request_sock *req)
4219 u16 family = sk->sk_family;
4220 struct smack_known *skp;
4221 struct socket_smack *ssp = sk->sk_security;
4222 struct netlbl_lsm_secattr secattr;
4223 struct sockaddr_in addr;
4225 struct smack_known *hskp;
4227 struct smk_audit_info ad;
4229 struct lsm_network_audit net;
4232 #if IS_ENABLED(CONFIG_IPV6)
4233 if (family == PF_INET6) {
4235 * Handle mapped IPv4 packets arriving
4236 * via IPv6 sockets. Don't set up netlabel
4237 * processing on IPv6.
4239 if (skb->protocol == htons(ETH_P_IP))
4244 #endif /* CONFIG_IPV6 */
4246 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4248 * If there is a secmark use it rather than the CIPSO label.
4249 * If there is no secmark fall back to CIPSO.
4250 * The secmark is assumed to reflect policy better.
4252 if (skb && skb->secmark != 0) {
4253 skp = smack_from_secid(skb->secmark);
4256 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4258 netlbl_secattr_init(&secattr);
4259 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4261 skp = smack_from_secattr(&secattr, ssp);
4263 skp = &smack_known_huh;
4264 netlbl_secattr_destroy(&secattr);
4266 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4271 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4272 ad.a.u.net->family = family;
4273 ad.a.u.net->netif = skb->skb_iif;
4274 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4277 * Receiving a packet requires that the other end be able to write
4278 * here. Read access is not required.
4280 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4281 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4286 * Save the peer's label in the request_sock so we can later setup
4287 * smk_packet in the child socket so that SO_PEERCRED can report it.
4289 req->peer_secid = skp->smk_secid;
4292 * We need to decide if we want to label the incoming connection here
4293 * if we do we only need to label the request_sock and the stack will
4294 * propagate the wire-label to the sock when it is created.
4297 addr.sin_addr.s_addr = hdr->saddr;
4299 hskp = smack_ipv4host_label(&addr);
4303 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4305 netlbl_req_delattr(req);
4311 * smack_inet_csk_clone - Copy the connection information to the new socket
4312 * @sk: the new socket
4313 * @req: the connection's request_sock
4315 * Transfer the connection's peer label to the newly created socket.
4317 static void smack_inet_csk_clone(struct sock *sk,
4318 const struct request_sock *req)
4320 struct socket_smack *ssp = sk->sk_security;
4321 struct smack_known *skp;
4323 if (req->peer_secid != 0) {
4324 skp = smack_from_secid(req->peer_secid);
4325 ssp->smk_packet = skp;
4327 ssp->smk_packet = NULL;
4331 * Key management security hooks
4333 * Casey has not tested key support very heavily.
4334 * The permission check is most likely too restrictive.
4335 * If you care about keys please have a look.
4340 * smack_key_alloc - Set the key security blob
4342 * @cred: the credentials to use
4345 * No allocation required
4349 static int smack_key_alloc(struct key *key, const struct cred *cred,
4350 unsigned long flags)
4352 struct smack_known *skp = smk_of_task(cred->security);
4354 key->security = skp;
4359 * smack_key_free - Clear the key security blob
4362 * Clear the blob pointer
4364 static void smack_key_free(struct key *key)
4366 key->security = NULL;
4370 * smack_key_permission - Smack access on a key
4371 * @key_ref: gets to the object
4372 * @cred: the credentials to use
4373 * @perm: requested key permissions
4375 * Return 0 if the task has read and write to the object,
4376 * an error code otherwise
4378 static int smack_key_permission(key_ref_t key_ref,
4379 const struct cred *cred, unsigned perm)
4382 struct smk_audit_info ad;
4383 struct smack_known *tkp = smk_of_task(cred->security);
4387 keyp = key_ref_to_ptr(key_ref);
4391 * If the key hasn't been initialized give it access so that
4394 if (keyp->security == NULL)
4397 * This should not occur
4402 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4403 ad.a.u.key_struct.key = keyp->serial;
4404 ad.a.u.key_struct.key_desc = keyp->description;
4406 if (perm & KEY_NEED_READ)
4408 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4409 request = MAY_WRITE;
4410 rc = smk_access(tkp, keyp->security, request, &ad);
4411 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4416 * smack_key_getsecurity - Smack label tagging the key
4417 * @key points to the key to be queried
4418 * @_buffer points to a pointer that should be set to point to the
4419 * resulting string (if no label or an error occurs).
4420 * Return the length of the string (including terminating NUL) or -ve if
4422 * May also return 0 (and a NULL buffer pointer) if there is no label.
4424 static int smack_key_getsecurity(struct key *key, char **_buffer)
4426 struct smack_known *skp = key->security;
4430 if (key->security == NULL) {
4435 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4438 length = strlen(copy) + 1;
4444 #endif /* CONFIG_KEYS */
4449 * Audit requires a unique representation of each Smack specific
4450 * rule. This unique representation is used to distinguish the
4451 * object to be audited from remaining kernel objects and also
4452 * works as a glue between the audit hooks.
4454 * Since repository entries are added but never deleted, we'll use
4455 * the smack_known label address related to the given audit rule as
4456 * the needed unique representation. This also better fits the smack
4457 * model where nearly everything is a label.
4462 * smack_audit_rule_init - Initialize a smack audit rule
4463 * @field: audit rule fields given from user-space (audit.h)
4464 * @op: required testing operator (=, !=, >, <, ...)
4465 * @rulestr: smack label to be audited
4466 * @vrule: pointer to save our own audit rule representation
4468 * Prepare to audit cases where (@field @op @rulestr) is true.
4469 * The label to be audited is created if necessay.
4471 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4473 struct smack_known *skp;
4474 char **rule = (char **)vrule;
4477 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4480 if (op != Audit_equal && op != Audit_not_equal)
4483 skp = smk_import_entry(rulestr, 0);
4485 return PTR_ERR(skp);
4487 *rule = skp->smk_known;
4493 * smack_audit_rule_known - Distinguish Smack audit rules
4494 * @krule: rule of interest, in Audit kernel representation format
4496 * This is used to filter Smack rules from remaining Audit ones.
4497 * If it's proved that this rule belongs to us, the
4498 * audit_rule_match hook will be called to do the final judgement.
4500 static int smack_audit_rule_known(struct audit_krule *krule)
4502 struct audit_field *f;
4505 for (i = 0; i < krule->field_count; i++) {
4506 f = &krule->fields[i];
4508 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4516 * smack_audit_rule_match - Audit given object ?
4517 * @secid: security id for identifying the object to test
4518 * @field: audit rule flags given from user-space
4519 * @op: required testing operator
4520 * @vrule: smack internal rule presentation
4521 * @actx: audit context associated with the check
4523 * The core Audit hook. It's used to take the decision of
4524 * whether to audit or not to audit a given object.
4526 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4527 struct audit_context *actx)
4529 struct smack_known *skp;
4532 if (unlikely(!rule)) {
4533 WARN_ONCE(1, "Smack: missing rule\n");
4537 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4540 skp = smack_from_secid(secid);
4543 * No need to do string comparisons. If a match occurs,
4544 * both pointers will point to the same smack_known
4547 if (op == Audit_equal)
4548 return (rule == skp->smk_known);
4549 if (op == Audit_not_equal)
4550 return (rule != skp->smk_known);
4556 * There is no need for a smack_audit_rule_free hook.
4557 * No memory was allocated.
4560 #endif /* CONFIG_AUDIT */
4563 * smack_ismaclabel - check if xattr @name references a smack MAC label
4564 * @name: Full xattr name to check.
4566 static int smack_ismaclabel(const char *name)
4568 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4573 * smack_secid_to_secctx - return the smack label for a secid
4574 * @secid: incoming integer
4575 * @secdata: destination
4576 * @seclen: how long it is
4578 * Exists for networking code.
4580 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4582 struct smack_known *skp = smack_from_secid(secid);
4585 *secdata = skp->smk_known;
4586 *seclen = strlen(skp->smk_known);
4591 * smack_secctx_to_secid - return the secid for a smack label
4592 * @secdata: smack label
4593 * @seclen: how long result is
4594 * @secid: outgoing integer
4596 * Exists for audit and networking code.
4598 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4600 struct smack_known *skp = smk_find_entry(secdata);
4603 *secid = skp->smk_secid;
4610 * There used to be a smack_release_secctx hook
4611 * that did nothing back when hooks were in a vector.
4612 * Now that there's a list such a hook adds cost.
4615 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4617 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4620 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4622 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4625 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4628 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4636 static struct security_hook_list smack_hooks[] = {
4637 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4638 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4639 LSM_HOOK_INIT(syslog, smack_syslog),
4641 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4642 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4643 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4644 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4645 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4646 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4647 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4649 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4650 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4651 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4653 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4654 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4655 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4656 LSM_HOOK_INIT(inode_link, smack_inode_link),
4657 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4658 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4659 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4660 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4661 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4662 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4663 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4664 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4665 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4666 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4667 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4668 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4669 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4670 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4672 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4673 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4674 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4675 LSM_HOOK_INIT(file_lock, smack_file_lock),
4676 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4677 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4678 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4679 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4680 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4681 LSM_HOOK_INIT(file_receive, smack_file_receive),
4683 LSM_HOOK_INIT(file_open, smack_file_open),
4685 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4686 LSM_HOOK_INIT(cred_free, smack_cred_free),
4687 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4688 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4689 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4690 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4691 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4692 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4693 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4694 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4695 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4696 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4697 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4698 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4699 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4700 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4701 LSM_HOOK_INIT(task_kill, smack_task_kill),
4702 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4704 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4705 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4707 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4708 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4710 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4711 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4712 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4713 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4714 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4715 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4717 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4718 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4719 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4720 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4721 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4723 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4724 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4725 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4726 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4727 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4729 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4731 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4732 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4734 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4735 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4737 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4738 #ifdef SMACK_IPV6_PORT_LABELING
4739 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4741 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4742 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4743 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4744 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4745 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4746 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4747 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4748 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4749 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4750 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4752 /* key management security hooks */
4754 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4755 LSM_HOOK_INIT(key_free, smack_key_free),
4756 LSM_HOOK_INIT(key_permission, smack_key_permission),
4757 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4758 #endif /* CONFIG_KEYS */
4762 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4763 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4764 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4765 #endif /* CONFIG_AUDIT */
4767 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4768 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4769 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4770 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4771 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4772 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4776 static __init void init_smack_known_list(void)
4779 * Initialize rule list locks
4781 mutex_init(&smack_known_huh.smk_rules_lock);
4782 mutex_init(&smack_known_hat.smk_rules_lock);
4783 mutex_init(&smack_known_floor.smk_rules_lock);
4784 mutex_init(&smack_known_star.smk_rules_lock);
4785 mutex_init(&smack_known_web.smk_rules_lock);
4787 * Initialize rule lists
4789 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4790 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4791 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4792 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4793 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4795 * Create the known labels list
4797 smk_insert_entry(&smack_known_huh);
4798 smk_insert_entry(&smack_known_hat);
4799 smk_insert_entry(&smack_known_star);
4800 smk_insert_entry(&smack_known_floor);
4801 smk_insert_entry(&smack_known_web);
4805 * smack_init - initialize the smack system
4809 static __init int smack_init(void)
4812 struct task_smack *tsp;
4814 if (!security_module_enable("smack"))
4817 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4818 if (!smack_inode_cache)
4821 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4824 kmem_cache_destroy(smack_inode_cache);
4830 pr_info("Smack: Initializing.\n");
4831 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4832 pr_info("Smack: Netfilter enabled.\n");
4834 #ifdef SMACK_IPV6_PORT_LABELING
4835 pr_info("Smack: IPv6 port labeling enabled.\n");
4837 #ifdef SMACK_IPV6_SECMARK_LABELING
4838 pr_info("Smack: IPv6 Netfilter enabled.\n");
4842 * Set the security state for the initial task.
4844 cred = (struct cred *) current->cred;
4845 cred->security = tsp;
4847 /* initialize the smack_known_list */
4848 init_smack_known_list();
4853 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
4859 * Smack requires early initialization in order to label
4860 * all processes and objects when they are created.
4862 security_initcall(smack_init);