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)
702 opts->mnt_opts[num_mnt_opts] = fsdefault;
703 opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT;
706 opts->mnt_opts[num_mnt_opts] = fsfloor;
707 opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT;
710 opts->mnt_opts[num_mnt_opts] = fshat;
711 opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT;
714 opts->mnt_opts[num_mnt_opts] = fsroot;
715 opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT;
718 opts->mnt_opts[num_mnt_opts] = fstransmute;
719 opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT;
722 opts->num_mnt_opts = num_mnt_opts;
727 pr_warn("Smack: duplicate mount options\n");
739 * smack_set_mnt_opts - set Smack specific mount options
740 * @sb: the file system superblock
741 * @opts: Smack mount options
742 * @kern_flags: mount option from kernel space or user space
743 * @set_kern_flags: where to store converted mount opts
745 * Returns 0 on success, an error code on failure
747 * Allow filesystems with binary mount data to explicitly set Smack mount
750 static int smack_set_mnt_opts(struct super_block *sb,
751 struct security_mnt_opts *opts,
752 unsigned long kern_flags,
753 unsigned long *set_kern_flags)
755 struct dentry *root = sb->s_root;
756 struct inode *inode = d_backing_inode(root);
757 struct superblock_smack *sp = sb->s_security;
758 struct inode_smack *isp;
759 struct smack_known *skp;
761 int num_opts = opts->num_mnt_opts;
764 if (sp->smk_flags & SMK_SB_INITIALIZED)
767 if (!smack_privileged(CAP_MAC_ADMIN)) {
769 * Unprivileged mounts don't get to specify Smack values.
774 * Unprivileged mounts get root and default from the caller.
776 skp = smk_of_current();
778 sp->smk_default = skp;
780 * For a handful of fs types with no user-controlled
781 * backing store it's okay to trust security labels
782 * in the filesystem. The rest are untrusted.
784 if (sb->s_user_ns != &init_user_ns &&
785 sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
786 sb->s_magic != RAMFS_MAGIC) {
788 sp->smk_flags |= SMK_SB_UNTRUSTED;
792 sp->smk_flags |= SMK_SB_INITIALIZED;
794 for (i = 0; i < num_opts; i++) {
795 switch (opts->mnt_opts_flags[i]) {
797 skp = smk_import_entry(opts->mnt_opts[i], 0);
800 sp->smk_default = skp;
803 skp = smk_import_entry(opts->mnt_opts[i], 0);
809 skp = smk_import_entry(opts->mnt_opts[i], 0);
815 skp = smk_import_entry(opts->mnt_opts[i], 0);
821 skp = smk_import_entry(opts->mnt_opts[i], 0);
833 * Initialize the root inode.
835 isp = inode->i_security;
837 isp = new_inode_smack(sp->smk_root);
840 inode->i_security = isp;
842 isp->smk_inode = sp->smk_root;
845 isp->smk_flags |= SMK_INODE_TRANSMUTE;
851 * smack_sb_kern_mount - Smack specific mount processing
852 * @sb: the file system superblock
853 * @flags: the mount flags
854 * @data: the smack mount options
856 * Returns 0 on success, an error code on failure
858 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
861 char *options = data;
862 struct security_mnt_opts opts;
864 security_init_mnt_opts(&opts);
869 rc = smack_parse_opts_str(options, &opts);
874 rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
877 security_free_mnt_opts(&opts);
882 * smack_sb_statfs - Smack check on statfs
883 * @dentry: identifies the file system in question
885 * Returns 0 if current can read the floor of the filesystem,
886 * and error code otherwise
888 static int smack_sb_statfs(struct dentry *dentry)
890 struct superblock_smack *sbp = dentry->d_sb->s_security;
892 struct smk_audit_info ad;
894 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
895 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
897 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
898 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
907 * smack_bprm_set_creds - set creds for exec
908 * @bprm: the exec information
910 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
912 static int smack_bprm_set_creds(struct linux_binprm *bprm)
914 struct inode *inode = file_inode(bprm->file);
915 struct task_smack *bsp = bprm->cred->security;
916 struct inode_smack *isp;
917 struct superblock_smack *sbsp;
920 if (bprm->cred_prepared)
923 isp = inode->i_security;
924 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
927 sbsp = inode->i_sb->s_security;
928 if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
929 isp->smk_task != sbsp->smk_root)
932 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
933 struct task_struct *tracer;
937 tracer = ptrace_parent(current);
938 if (likely(tracer != NULL))
939 rc = smk_ptrace_rule_check(tracer,
947 } else if (bprm->unsafe)
950 bsp->smk_task = isp->smk_task;
951 bprm->per_clear |= PER_CLEAR_ON_SETID;
957 * smack_bprm_committing_creds - Prepare to install the new credentials
960 * @bprm: binprm for exec
962 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
964 struct task_smack *bsp = bprm->cred->security;
966 if (bsp->smk_task != bsp->smk_forked)
967 current->pdeath_signal = 0;
971 * smack_bprm_secureexec - Return the decision to use secureexec.
972 * @bprm: binprm for exec
974 * Returns 0 on success.
976 static int smack_bprm_secureexec(struct linux_binprm *bprm)
978 struct task_smack *tsp = current_security();
980 if (tsp->smk_task != tsp->smk_forked)
991 * smack_inode_alloc_security - allocate an inode blob
992 * @inode: the inode in need of a blob
994 * Returns 0 if it gets a blob, -ENOMEM otherwise
996 static int smack_inode_alloc_security(struct inode *inode)
998 struct smack_known *skp = smk_of_current();
1000 inode->i_security = new_inode_smack(skp);
1001 if (inode->i_security == NULL)
1007 * smack_inode_free_rcu - Free inode_smack blob from cache
1008 * @head: the rcu_head for getting inode_smack pointer
1010 * Call back function called from call_rcu() to free
1011 * the i_security blob pointer in inode
1013 static void smack_inode_free_rcu(struct rcu_head *head)
1015 struct inode_smack *issp;
1017 issp = container_of(head, struct inode_smack, smk_rcu);
1018 kmem_cache_free(smack_inode_cache, issp);
1022 * smack_inode_free_security - free an inode blob using call_rcu()
1023 * @inode: the inode with a blob
1025 * Clears the blob pointer in inode using RCU
1027 static void smack_inode_free_security(struct inode *inode)
1029 struct inode_smack *issp = inode->i_security;
1032 * The inode may still be referenced in a path walk and
1033 * a call to smack_inode_permission() can be made
1034 * after smack_inode_free_security() is called.
1035 * To avoid race condition free the i_security via RCU
1036 * and leave the current inode->i_security pointer intact.
1037 * The inode will be freed after the RCU grace period too.
1039 call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
1043 * smack_inode_init_security - copy out the smack from an inode
1044 * @inode: the newly created inode
1045 * @dir: containing directory object
1047 * @name: where to put the attribute name
1048 * @value: where to put the attribute value
1049 * @len: where to put the length of the attribute
1051 * Returns 0 if it all works out, -ENOMEM if there's no memory
1053 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
1054 const struct qstr *qstr, const char **name,
1055 void **value, size_t *len)
1057 struct inode_smack *issp = inode->i_security;
1058 struct smack_known *skp = smk_of_current();
1059 struct smack_known *isp = smk_of_inode(inode);
1060 struct smack_known *dsp = smk_of_inode(dir);
1064 *name = XATTR_SMACK_SUFFIX;
1068 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1073 * If the access rule allows transmutation and
1074 * the directory requests transmutation then
1075 * by all means transmute.
1076 * Mark the inode as changed.
1078 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1079 smk_inode_transmutable(dir)) {
1081 issp->smk_flags |= SMK_INODE_CHANGED;
1084 *value = kstrdup(isp->smk_known, GFP_NOFS);
1088 *len = strlen(isp->smk_known);
1095 * smack_inode_link - Smack check on link
1096 * @old_dentry: the existing object
1098 * @new_dentry: the new object
1100 * Returns 0 if access is permitted, an error code otherwise
1102 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1103 struct dentry *new_dentry)
1105 struct smack_known *isp;
1106 struct smk_audit_info ad;
1109 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1110 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1112 isp = smk_of_inode(d_backing_inode(old_dentry));
1113 rc = smk_curacc(isp, MAY_WRITE, &ad);
1114 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1116 if (rc == 0 && d_is_positive(new_dentry)) {
1117 isp = smk_of_inode(d_backing_inode(new_dentry));
1118 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1119 rc = smk_curacc(isp, MAY_WRITE, &ad);
1120 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1127 * smack_inode_unlink - Smack check on inode deletion
1128 * @dir: containing directory object
1129 * @dentry: file to unlink
1131 * Returns 0 if current can write the containing directory
1132 * and the object, error code otherwise
1134 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1136 struct inode *ip = d_backing_inode(dentry);
1137 struct smk_audit_info ad;
1140 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1141 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1144 * You need write access to the thing you're unlinking
1146 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1147 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1150 * You also need write access to the containing directory
1152 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1153 smk_ad_setfield_u_fs_inode(&ad, dir);
1154 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1155 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1161 * smack_inode_rmdir - Smack check on directory deletion
1162 * @dir: containing directory object
1163 * @dentry: directory to unlink
1165 * Returns 0 if current can write the containing directory
1166 * and the directory, error code otherwise
1168 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1170 struct smk_audit_info ad;
1173 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1174 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1177 * You need write access to the thing you're removing
1179 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1180 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1183 * You also need write access to the containing directory
1185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1186 smk_ad_setfield_u_fs_inode(&ad, dir);
1187 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1188 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1195 * smack_inode_rename - Smack check on rename
1196 * @old_inode: unused
1197 * @old_dentry: the old object
1198 * @new_inode: unused
1199 * @new_dentry: the new object
1201 * Read and write access is required on both the old and
1204 * Returns 0 if access is permitted, an error code otherwise
1206 static int smack_inode_rename(struct inode *old_inode,
1207 struct dentry *old_dentry,
1208 struct inode *new_inode,
1209 struct dentry *new_dentry)
1212 struct smack_known *isp;
1213 struct smk_audit_info ad;
1215 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1216 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1218 isp = smk_of_inode(d_backing_inode(old_dentry));
1219 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1220 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1222 if (rc == 0 && d_is_positive(new_dentry)) {
1223 isp = smk_of_inode(d_backing_inode(new_dentry));
1224 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1225 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1226 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1232 * smack_inode_permission - Smack version of permission()
1233 * @inode: the inode in question
1234 * @mask: the access requested
1236 * This is the important Smack hook.
1238 * Returns 0 if access is permitted, -EACCES otherwise
1240 static int smack_inode_permission(struct inode *inode, int mask)
1242 struct superblock_smack *sbsp = inode->i_sb->s_security;
1243 struct smk_audit_info ad;
1244 int no_block = mask & MAY_NOT_BLOCK;
1247 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1249 * No permission to check. Existence test. Yup, it's there.
1254 if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1255 if (smk_of_inode(inode) != sbsp->smk_root)
1259 /* May be droppable after audit */
1262 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1263 smk_ad_setfield_u_fs_inode(&ad, inode);
1264 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1265 rc = smk_bu_inode(inode, mask, rc);
1270 * smack_inode_setattr - Smack check for setting attributes
1271 * @dentry: the object
1272 * @iattr: for the force flag
1274 * Returns 0 if access is permitted, an error code otherwise
1276 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1278 struct smk_audit_info ad;
1282 * Need to allow for clearing the setuid bit.
1284 if (iattr->ia_valid & ATTR_FORCE)
1286 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1287 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1289 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1290 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1295 * smack_inode_getattr - Smack check for getting attributes
1296 * @mnt: vfsmount of the object
1297 * @dentry: the object
1299 * Returns 0 if access is permitted, an error code otherwise
1301 static int smack_inode_getattr(const struct path *path)
1303 struct smk_audit_info ad;
1304 struct inode *inode = d_backing_inode(path->dentry);
1307 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1308 smk_ad_setfield_u_fs_path(&ad, *path);
1309 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1310 rc = smk_bu_inode(inode, MAY_READ, rc);
1315 * smack_inode_setxattr - Smack check for setting xattrs
1316 * @dentry: the object
1317 * @name: name of the attribute
1318 * @value: value of the attribute
1319 * @size: size of the value
1322 * This protects the Smack attribute explicitly.
1324 * Returns 0 if access is permitted, an error code otherwise
1326 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1327 const void *value, size_t size, int flags)
1329 struct smk_audit_info ad;
1330 struct smack_known *skp;
1332 int check_import = 0;
1337 * Check label validity here so import won't fail in post_setxattr
1339 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1340 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1341 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1344 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1345 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1349 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1351 if (size != TRANS_TRUE_SIZE ||
1352 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1355 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1357 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1360 if (rc == 0 && check_import) {
1361 skp = size ? smk_import_entry(value, size) : NULL;
1364 else if (skp == NULL || (check_star &&
1365 (skp == &smack_known_star || skp == &smack_known_web)))
1369 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1370 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1373 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1374 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1381 * smack_inode_post_setxattr - Apply the Smack update approved above
1383 * @name: attribute name
1384 * @value: attribute value
1385 * @size: attribute size
1388 * Set the pointer in the inode blob to the entry found
1389 * in the master label list.
1391 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1392 const void *value, size_t size, int flags)
1394 struct smack_known *skp;
1395 struct inode_smack *isp = d_backing_inode(dentry)->i_security;
1397 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1398 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1402 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1403 skp = smk_import_entry(value, size);
1405 isp->smk_inode = skp;
1406 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1407 skp = smk_import_entry(value, size);
1409 isp->smk_task = skp;
1410 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1411 skp = smk_import_entry(value, size);
1413 isp->smk_mmap = skp;
1420 * smack_inode_getxattr - Smack check on getxattr
1421 * @dentry: the object
1424 * Returns 0 if access is permitted, an error code otherwise
1426 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1428 struct smk_audit_info ad;
1431 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1432 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1434 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1435 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1440 * smack_inode_removexattr - Smack check on removexattr
1441 * @dentry: the object
1442 * @name: name of the attribute
1444 * Removing the Smack attribute requires CAP_MAC_ADMIN
1446 * Returns 0 if access is permitted, an error code otherwise
1448 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1450 struct inode_smack *isp;
1451 struct smk_audit_info ad;
1454 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1455 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1456 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1457 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1458 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1459 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1460 if (!smack_privileged(CAP_MAC_ADMIN))
1463 rc = cap_inode_removexattr(dentry, name);
1468 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1469 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1471 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1472 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1476 isp = d_backing_inode(dentry)->i_security;
1478 * Don't do anything special for these.
1479 * XATTR_NAME_SMACKIPIN
1480 * XATTR_NAME_SMACKIPOUT
1482 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1483 struct super_block *sbp = dentry->d_sb;
1484 struct superblock_smack *sbsp = sbp->s_security;
1486 isp->smk_inode = sbsp->smk_default;
1487 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1488 isp->smk_task = NULL;
1489 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1490 isp->smk_mmap = NULL;
1491 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1492 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1498 * smack_inode_getsecurity - get smack xattrs
1499 * @inode: the object
1500 * @name: attribute name
1501 * @buffer: where to put the result
1504 * Returns the size of the attribute or an error code
1506 static int smack_inode_getsecurity(struct inode *inode,
1507 const char *name, void **buffer,
1510 struct socket_smack *ssp;
1511 struct socket *sock;
1512 struct super_block *sbp;
1513 struct inode *ip = (struct inode *)inode;
1514 struct smack_known *isp;
1518 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1519 isp = smk_of_inode(inode);
1520 ilen = strlen(isp->smk_known);
1521 *buffer = isp->smk_known;
1526 * The rest of the Smack xattrs are only on sockets.
1529 if (sbp->s_magic != SOCKFS_MAGIC)
1532 sock = SOCKET_I(ip);
1533 if (sock == NULL || sock->sk == NULL)
1536 ssp = sock->sk->sk_security;
1538 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1540 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1545 ilen = strlen(isp->smk_known);
1547 *buffer = isp->smk_known;
1556 * smack_inode_listsecurity - list the Smack attributes
1557 * @inode: the object
1558 * @buffer: where they go
1559 * @buffer_size: size of buffer
1561 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1564 int len = sizeof(XATTR_NAME_SMACK);
1566 if (buffer != NULL && len <= buffer_size)
1567 memcpy(buffer, XATTR_NAME_SMACK, len);
1573 * smack_inode_getsecid - Extract inode's security id
1574 * @inode: inode to extract the info from
1575 * @secid: where result will be saved
1577 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1579 struct inode_smack *isp = inode->i_security;
1581 *secid = isp->smk_inode->smk_secid;
1589 * There is no smack_file_permission hook
1591 * Should access checks be done on each read or write?
1592 * UNICOS and SELinux say yes.
1593 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1595 * I'll say no for now. Smack does not do the frequent
1596 * label changing that SELinux does.
1600 * smack_file_alloc_security - assign a file security blob
1603 * The security blob for a file is a pointer to the master
1604 * label list, so no allocation is done.
1606 * f_security is the owner security information. It
1607 * isn't used on file access checks, it's for send_sigio.
1611 static int smack_file_alloc_security(struct file *file)
1613 struct smack_known *skp = smk_of_current();
1615 file->f_security = skp;
1620 * smack_file_free_security - clear a file security blob
1623 * The security blob for a file is a pointer to the master
1624 * label list, so no memory is freed.
1626 static void smack_file_free_security(struct file *file)
1628 file->f_security = NULL;
1632 * smack_file_ioctl - Smack check on ioctls
1637 * Relies heavily on the correct use of the ioctl command conventions.
1639 * Returns 0 if allowed, error code otherwise
1641 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1645 struct smk_audit_info ad;
1646 struct inode *inode = file_inode(file);
1648 if (unlikely(IS_PRIVATE(inode)))
1651 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1652 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1654 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1655 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1656 rc = smk_bu_file(file, MAY_WRITE, rc);
1659 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1660 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1661 rc = smk_bu_file(file, MAY_READ, rc);
1668 * smack_file_lock - Smack check on file locking
1672 * Returns 0 if current has lock access, error code otherwise
1674 static int smack_file_lock(struct file *file, unsigned int cmd)
1676 struct smk_audit_info ad;
1678 struct inode *inode = file_inode(file);
1680 if (unlikely(IS_PRIVATE(inode)))
1683 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1684 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1685 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1686 rc = smk_bu_file(file, MAY_LOCK, rc);
1691 * smack_file_fcntl - Smack check on fcntl
1693 * @cmd: what action to check
1696 * Generally these operations are harmless.
1697 * File locking operations present an obvious mechanism
1698 * for passing information, so they require write access.
1700 * Returns 0 if current has access, error code otherwise
1702 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1705 struct smk_audit_info ad;
1707 struct inode *inode = file_inode(file);
1709 if (unlikely(IS_PRIVATE(inode)))
1717 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1718 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1719 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1720 rc = smk_bu_file(file, MAY_LOCK, rc);
1724 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1725 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1726 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1727 rc = smk_bu_file(file, MAY_WRITE, rc);
1738 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1739 * if mapping anonymous memory.
1740 * @file contains the file structure for file to map (may be NULL).
1741 * @reqprot contains the protection requested by the application.
1742 * @prot contains the protection that will be applied by the kernel.
1743 * @flags contains the operational flags.
1744 * Return 0 if permission is granted.
1746 static int smack_mmap_file(struct file *file,
1747 unsigned long reqprot, unsigned long prot,
1748 unsigned long flags)
1750 struct smack_known *skp;
1751 struct smack_known *mkp;
1752 struct smack_rule *srp;
1753 struct task_smack *tsp;
1754 struct smack_known *okp;
1755 struct inode_smack *isp;
1756 struct superblock_smack *sbsp;
1765 if (unlikely(IS_PRIVATE(file_inode(file))))
1768 isp = file_inode(file)->i_security;
1769 if (isp->smk_mmap == NULL)
1771 sbsp = file_inode(file)->i_sb->s_security;
1772 if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1773 isp->smk_mmap != sbsp->smk_root)
1775 mkp = isp->smk_mmap;
1777 tsp = current_security();
1778 skp = smk_of_current();
1783 * For each Smack rule associated with the subject
1784 * label verify that the SMACK64MMAP also has access
1785 * to that rule's object label.
1787 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1788 okp = srp->smk_object;
1790 * Matching labels always allows access.
1792 if (mkp->smk_known == okp->smk_known)
1795 * If there is a matching local rule take
1796 * that into account as well.
1798 may = smk_access_entry(srp->smk_subject->smk_known,
1802 may = srp->smk_access;
1804 may &= srp->smk_access;
1806 * If may is zero the SMACK64MMAP subject can't
1807 * possibly have less access.
1813 * Fetch the global list entry.
1814 * If there isn't one a SMACK64MMAP subject
1815 * can't have as much access as current.
1817 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1819 if (mmay == -ENOENT) {
1824 * If there is a local entry it modifies the
1825 * potential access, too.
1827 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1829 if (tmay != -ENOENT)
1833 * If there is any access available to current that is
1834 * not available to a SMACK64MMAP subject
1837 if ((may | mmay) != mmay) {
1849 * smack_file_set_fowner - set the file security blob value
1850 * @file: object in question
1853 static void smack_file_set_fowner(struct file *file)
1855 file->f_security = smk_of_current();
1859 * smack_file_send_sigiotask - Smack on sigio
1860 * @tsk: The target task
1861 * @fown: the object the signal come from
1864 * Allow a privileged task to get signals even if it shouldn't
1866 * Returns 0 if a subject with the object's smack could
1867 * write to the task, an error code otherwise.
1869 static int smack_file_send_sigiotask(struct task_struct *tsk,
1870 struct fown_struct *fown, int signum)
1872 struct smack_known *skp;
1873 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1876 struct smk_audit_info ad;
1879 * struct fown_struct is never outside the context of a struct file
1881 file = container_of(fown, struct file, f_owner);
1883 /* we don't log here as rc can be overriden */
1884 skp = file->f_security;
1885 rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1886 rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1887 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1890 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1891 smk_ad_setfield_u_tsk(&ad, tsk);
1892 smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1897 * smack_file_receive - Smack file receive check
1900 * Returns 0 if current has access, error code otherwise
1902 static int smack_file_receive(struct file *file)
1906 struct smk_audit_info ad;
1907 struct inode *inode = file_inode(file);
1908 struct socket *sock;
1909 struct task_smack *tsp;
1910 struct socket_smack *ssp;
1912 if (unlikely(IS_PRIVATE(inode)))
1915 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1916 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1918 if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
1919 sock = SOCKET_I(inode);
1920 ssp = sock->sk->sk_security;
1921 tsp = current_security();
1923 * If the receiving process can't write to the
1924 * passed socket or if the passed socket can't
1925 * write to the receiving process don't accept
1926 * the passed socket.
1928 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1929 rc = smk_bu_file(file, may, rc);
1932 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1933 rc = smk_bu_file(file, may, rc);
1937 * This code relies on bitmasks.
1939 if (file->f_mode & FMODE_READ)
1941 if (file->f_mode & FMODE_WRITE)
1944 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1945 rc = smk_bu_file(file, may, rc);
1950 * smack_file_open - Smack dentry open processing
1952 * @cred: task credential
1954 * Set the security blob in the file structure.
1955 * Allow the open only if the task has read access. There are
1956 * many read operations (e.g. fstat) that you can do with an
1957 * fd even if you have the file open write-only.
1961 static int smack_file_open(struct file *file, const struct cred *cred)
1963 struct task_smack *tsp = cred->security;
1964 struct inode *inode = file_inode(file);
1965 struct smk_audit_info ad;
1968 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1969 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1970 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1971 rc = smk_bu_credfile(cred, file, MAY_READ, rc);
1981 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1982 * @new: the new credentials
1983 * @gfp: the atomicity of any memory allocations
1985 * Prepare a blank set of credentials for modification. This must allocate all
1986 * the memory the LSM module might require such that cred_transfer() can
1987 * complete without error.
1989 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1991 struct task_smack *tsp;
1993 tsp = new_task_smack(NULL, NULL, gfp);
1997 cred->security = tsp;
2004 * smack_cred_free - "free" task-level security credentials
2005 * @cred: the credentials in question
2008 static void smack_cred_free(struct cred *cred)
2010 struct task_smack *tsp = cred->security;
2011 struct smack_rule *rp;
2012 struct list_head *l;
2013 struct list_head *n;
2017 cred->security = NULL;
2019 smk_destroy_label_list(&tsp->smk_relabel);
2021 list_for_each_safe(l, n, &tsp->smk_rules) {
2022 rp = list_entry(l, struct smack_rule, list);
2023 list_del(&rp->list);
2030 * smack_cred_prepare - prepare new set of credentials for modification
2031 * @new: the new credentials
2032 * @old: the original credentials
2033 * @gfp: the atomicity of any memory allocations
2035 * Prepare a new set of credentials for modification.
2037 static int smack_cred_prepare(struct cred *new, const struct cred *old,
2040 struct task_smack *old_tsp = old->security;
2041 struct task_smack *new_tsp;
2044 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
2045 if (new_tsp == NULL)
2048 new->security = new_tsp;
2050 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
2054 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2063 * smack_cred_transfer - Transfer the old credentials to the new credentials
2064 * @new: the new credentials
2065 * @old: the original credentials
2067 * Fill in a set of blank credentials from another set of credentials.
2069 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2071 struct task_smack *old_tsp = old->security;
2072 struct task_smack *new_tsp = new->security;
2074 new_tsp->smk_task = old_tsp->smk_task;
2075 new_tsp->smk_forked = old_tsp->smk_task;
2076 mutex_init(&new_tsp->smk_rules_lock);
2077 INIT_LIST_HEAD(&new_tsp->smk_rules);
2080 /* cbs copy rule list */
2084 * smack_kernel_act_as - Set the subjective context in a set of credentials
2085 * @new: points to the set of credentials to be modified.
2086 * @secid: specifies the security ID to be set
2088 * Set the security data for a kernel service.
2090 static int smack_kernel_act_as(struct cred *new, u32 secid)
2092 struct task_smack *new_tsp = new->security;
2094 new_tsp->smk_task = smack_from_secid(secid);
2099 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2100 * @new: points to the set of credentials to be modified
2101 * @inode: points to the inode to use as a reference
2103 * Set the file creation context in a set of credentials to the same
2104 * as the objective context of the specified inode
2106 static int smack_kernel_create_files_as(struct cred *new,
2107 struct inode *inode)
2109 struct inode_smack *isp = inode->i_security;
2110 struct task_smack *tsp = new->security;
2112 tsp->smk_forked = isp->smk_inode;
2113 tsp->smk_task = tsp->smk_forked;
2118 * smk_curacc_on_task - helper to log task related access
2119 * @p: the task object
2120 * @access: the access requested
2121 * @caller: name of the calling function for audit
2123 * Return 0 if access is permitted
2125 static int smk_curacc_on_task(struct task_struct *p, int access,
2128 struct smk_audit_info ad;
2129 struct smack_known *skp = smk_of_task_struct(p);
2132 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2133 smk_ad_setfield_u_tsk(&ad, p);
2134 rc = smk_curacc(skp, access, &ad);
2135 rc = smk_bu_task(p, access, rc);
2140 * smack_task_setpgid - Smack check on setting pgid
2141 * @p: the task object
2144 * Return 0 if write access is permitted
2146 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2148 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2152 * smack_task_getpgid - Smack access check for getpgid
2153 * @p: the object task
2155 * Returns 0 if current can read the object task, error code otherwise
2157 static int smack_task_getpgid(struct task_struct *p)
2159 return smk_curacc_on_task(p, MAY_READ, __func__);
2163 * smack_task_getsid - Smack access check for getsid
2164 * @p: the object task
2166 * Returns 0 if current can read the object task, error code otherwise
2168 static int smack_task_getsid(struct task_struct *p)
2170 return smk_curacc_on_task(p, MAY_READ, __func__);
2174 * smack_task_getsecid - get the secid of the task
2175 * @p: the object task
2176 * @secid: where to put the result
2178 * Sets the secid to contain a u32 version of the smack label.
2180 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2182 struct smack_known *skp = smk_of_task_struct(p);
2184 *secid = skp->smk_secid;
2188 * smack_task_setnice - Smack check on setting nice
2189 * @p: the task object
2192 * Return 0 if write access is permitted
2194 static int smack_task_setnice(struct task_struct *p, int nice)
2196 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2200 * smack_task_setioprio - Smack check on setting ioprio
2201 * @p: the task object
2204 * Return 0 if write access is permitted
2206 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2208 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2212 * smack_task_getioprio - Smack check on reading ioprio
2213 * @p: the task object
2215 * Return 0 if read access is permitted
2217 static int smack_task_getioprio(struct task_struct *p)
2219 return smk_curacc_on_task(p, MAY_READ, __func__);
2223 * smack_task_setscheduler - Smack check on setting scheduler
2224 * @p: the task object
2228 * Return 0 if read access is permitted
2230 static int smack_task_setscheduler(struct task_struct *p)
2232 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2236 * smack_task_getscheduler - Smack check on reading scheduler
2237 * @p: the task object
2239 * Return 0 if read access is permitted
2241 static int smack_task_getscheduler(struct task_struct *p)
2243 return smk_curacc_on_task(p, MAY_READ, __func__);
2247 * smack_task_movememory - Smack check on moving memory
2248 * @p: the task object
2250 * Return 0 if write access is permitted
2252 static int smack_task_movememory(struct task_struct *p)
2254 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2258 * smack_task_kill - Smack check on signal delivery
2259 * @p: the task object
2262 * @secid: identifies the smack to use in lieu of current's
2264 * Return 0 if write access is permitted
2266 * The secid behavior is an artifact of an SELinux hack
2267 * in the USB code. Someday it may go away.
2269 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
2272 struct smk_audit_info ad;
2273 struct smack_known *skp;
2274 struct smack_known *tkp = smk_of_task_struct(p);
2278 return 0; /* null signal; existence test */
2280 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2281 smk_ad_setfield_u_tsk(&ad, p);
2283 * Sending a signal requires that the sender
2284 * can write the receiver.
2287 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2288 rc = smk_bu_task(p, MAY_DELIVER, rc);
2292 * If the secid isn't 0 we're dealing with some USB IO
2293 * specific behavior. This is not clean. For one thing
2294 * we can't take privilege into account.
2296 skp = smack_from_secid(secid);
2297 rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2298 rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2303 * smack_task_to_inode - copy task smack into the inode blob
2304 * @p: task to copy from
2305 * @inode: inode to copy to
2307 * Sets the smack pointer in the inode security blob
2309 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2311 struct inode_smack *isp = inode->i_security;
2312 struct smack_known *skp = smk_of_task_struct(p);
2314 isp->smk_inode = skp;
2322 * smack_sk_alloc_security - Allocate a socket blob
2325 * @gfp_flags: memory allocation flags
2327 * Assign Smack pointers to current
2329 * Returns 0 on success, -ENOMEM is there's no memory
2331 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2333 struct smack_known *skp = smk_of_current();
2334 struct socket_smack *ssp;
2336 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2341 * Sockets created by kernel threads receive web label.
2343 if (unlikely(current->flags & PF_KTHREAD)) {
2344 ssp->smk_in = &smack_known_web;
2345 ssp->smk_out = &smack_known_web;
2350 ssp->smk_packet = NULL;
2352 sk->sk_security = ssp;
2358 * smack_sk_free_security - Free a socket blob
2361 * Clears the blob pointer
2363 static void smack_sk_free_security(struct sock *sk)
2365 #ifdef SMACK_IPV6_PORT_LABELING
2366 struct smk_port_label *spp;
2368 if (sk->sk_family == PF_INET6) {
2370 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2371 if (spp->smk_sock != sk)
2373 spp->smk_can_reuse = 1;
2379 kfree(sk->sk_security);
2383 * smack_ipv4host_label - check host based restrictions
2384 * @sip: the object end
2386 * looks for host based access restrictions
2388 * This version will only be appropriate for really small sets of single label
2389 * hosts. The caller is responsible for ensuring that the RCU read lock is
2390 * taken before calling this function.
2392 * Returns the label of the far end or NULL if it's not special.
2394 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2396 struct smk_net4addr *snp;
2397 struct in_addr *siap = &sip->sin_addr;
2399 if (siap->s_addr == 0)
2402 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2404 * we break after finding the first match because
2405 * the list is sorted from longest to shortest mask
2406 * so we have found the most specific match
2408 if (snp->smk_host.s_addr ==
2409 (siap->s_addr & snp->smk_mask.s_addr))
2410 return snp->smk_label;
2415 #if IS_ENABLED(CONFIG_IPV6)
2417 * smk_ipv6_localhost - Check for local ipv6 host address
2420 * Returns boolean true if this is the localhost address
2422 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2424 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2425 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2427 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2428 ntohs(be16p[7]) == 1)
2434 * smack_ipv6host_label - check host based restrictions
2435 * @sip: the object end
2437 * looks for host based access restrictions
2439 * This version will only be appropriate for really small sets of single label
2440 * hosts. The caller is responsible for ensuring that the RCU read lock is
2441 * taken before calling this function.
2443 * Returns the label of the far end or NULL if it's not special.
2445 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2447 struct smk_net6addr *snp;
2448 struct in6_addr *sap = &sip->sin6_addr;
2453 * It's local. Don't look for a host label.
2455 if (smk_ipv6_localhost(sip))
2458 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2460 * If the label is NULL the entry has
2461 * been renounced. Ignore it.
2463 if (snp->smk_label == NULL)
2466 * we break after finding the first match because
2467 * the list is sorted from longest to shortest mask
2468 * so we have found the most specific match
2470 for (found = 1, i = 0; i < 8; i++) {
2471 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2472 snp->smk_host.s6_addr16[i]) {
2478 return snp->smk_label;
2483 #endif /* CONFIG_IPV6 */
2486 * smack_netlabel - Set the secattr on a socket
2488 * @labeled: socket label scheme
2490 * Convert the outbound smack value (smk_out) to a
2491 * secattr and attach it to the socket.
2493 * Returns 0 on success or an error code
2495 static int smack_netlabel(struct sock *sk, int labeled)
2497 struct smack_known *skp;
2498 struct socket_smack *ssp = sk->sk_security;
2502 * Usually the netlabel code will handle changing the
2503 * packet labeling based on the label.
2504 * The case of a single label host is different, because
2505 * a single label host should never get a labeled packet
2506 * even though the label is usually associated with a packet
2510 bh_lock_sock_nested(sk);
2512 if (ssp->smk_out == smack_net_ambient ||
2513 labeled == SMACK_UNLABELED_SOCKET)
2514 netlbl_sock_delattr(sk);
2517 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2527 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2529 * @sap: the destination address
2531 * Set the correct secattr for the given socket based on the destination
2532 * address and perform any outbound access checks needed.
2534 * Returns 0 on success or an error code.
2537 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2539 struct smack_known *skp;
2542 struct smack_known *hkp;
2543 struct socket_smack *ssp = sk->sk_security;
2544 struct smk_audit_info ad;
2547 hkp = smack_ipv4host_label(sap);
2550 struct lsm_network_audit net;
2552 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2553 ad.a.u.net->family = sap->sin_family;
2554 ad.a.u.net->dport = sap->sin_port;
2555 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2557 sk_lbl = SMACK_UNLABELED_SOCKET;
2559 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2560 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2562 sk_lbl = SMACK_CIPSO_SOCKET;
2569 return smack_netlabel(sk, sk_lbl);
2572 #if IS_ENABLED(CONFIG_IPV6)
2574 * smk_ipv6_check - check Smack access
2575 * @subject: subject Smack label
2576 * @object: object Smack label
2578 * @act: the action being taken
2580 * Check an IPv6 access
2582 static int smk_ipv6_check(struct smack_known *subject,
2583 struct smack_known *object,
2584 struct sockaddr_in6 *address, int act)
2587 struct lsm_network_audit net;
2589 struct smk_audit_info ad;
2593 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2594 ad.a.u.net->family = PF_INET6;
2595 ad.a.u.net->dport = ntohs(address->sin6_port);
2596 if (act == SMK_RECEIVING)
2597 ad.a.u.net->v6info.saddr = address->sin6_addr;
2599 ad.a.u.net->v6info.daddr = address->sin6_addr;
2601 rc = smk_access(subject, object, MAY_WRITE, &ad);
2602 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2605 #endif /* CONFIG_IPV6 */
2607 #ifdef SMACK_IPV6_PORT_LABELING
2609 * smk_ipv6_port_label - Smack port access table management
2613 * Create or update the port list entry
2615 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2617 struct sock *sk = sock->sk;
2618 struct sockaddr_in6 *addr6;
2619 struct socket_smack *ssp = sock->sk->sk_security;
2620 struct smk_port_label *spp;
2621 unsigned short port = 0;
2623 if (address == NULL) {
2625 * This operation is changing the Smack information
2626 * on the bound socket. Take the changes to the port
2630 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2631 if (sk != spp->smk_sock)
2633 spp->smk_in = ssp->smk_in;
2634 spp->smk_out = ssp->smk_out;
2639 * A NULL address is only used for updating existing
2640 * bound entries. If there isn't one, it's OK.
2646 addr6 = (struct sockaddr_in6 *)address;
2647 port = ntohs(addr6->sin6_port);
2649 * This is a special case that is safely ignored.
2655 * Look for an existing port list entry.
2656 * This is an indication that a port is getting reused.
2659 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2660 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2662 if (spp->smk_can_reuse != 1) {
2666 spp->smk_port = port;
2668 spp->smk_in = ssp->smk_in;
2669 spp->smk_out = ssp->smk_out;
2670 spp->smk_can_reuse = 0;
2676 * A new port entry is required.
2678 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2682 spp->smk_port = port;
2684 spp->smk_in = ssp->smk_in;
2685 spp->smk_out = ssp->smk_out;
2686 spp->smk_sock_type = sock->type;
2687 spp->smk_can_reuse = 0;
2689 mutex_lock(&smack_ipv6_lock);
2690 list_add_rcu(&spp->list, &smk_ipv6_port_list);
2691 mutex_unlock(&smack_ipv6_lock);
2696 * smk_ipv6_port_check - check Smack port access
2700 * Create or update the port list entry
2702 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2705 struct smk_port_label *spp;
2706 struct socket_smack *ssp = sk->sk_security;
2707 struct smack_known *skp = NULL;
2708 unsigned short port;
2709 struct smack_known *object;
2711 if (act == SMK_RECEIVING) {
2712 skp = smack_ipv6host_label(address);
2713 object = ssp->smk_in;
2716 object = smack_ipv6host_label(address);
2720 * The other end is a single label host.
2722 if (skp != NULL && object != NULL)
2723 return smk_ipv6_check(skp, object, address, act);
2725 skp = smack_net_ambient;
2727 object = smack_net_ambient;
2730 * It's remote, so port lookup does no good.
2732 if (!smk_ipv6_localhost(address))
2733 return smk_ipv6_check(skp, object, address, act);
2736 * It's local so the send check has to have passed.
2738 if (act == SMK_RECEIVING)
2741 port = ntohs(address->sin6_port);
2743 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2744 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2746 object = spp->smk_in;
2747 if (act == SMK_CONNECTING)
2748 ssp->smk_packet = spp->smk_out;
2753 return smk_ipv6_check(skp, object, address, act);
2755 #endif /* SMACK_IPV6_PORT_LABELING */
2758 * smack_inode_setsecurity - set smack xattrs
2759 * @inode: the object
2760 * @name: attribute name
2761 * @value: attribute value
2762 * @size: size of the attribute
2765 * Sets the named attribute in the appropriate blob
2767 * Returns 0 on success, or an error code
2769 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2770 const void *value, size_t size, int flags)
2772 struct smack_known *skp;
2773 struct inode_smack *nsp = inode->i_security;
2774 struct socket_smack *ssp;
2775 struct socket *sock;
2778 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2781 skp = smk_import_entry(value, size);
2783 return PTR_ERR(skp);
2785 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2786 nsp->smk_inode = skp;
2787 nsp->smk_flags |= SMK_INODE_INSTANT;
2791 * The rest of the Smack xattrs are only on sockets.
2793 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2796 sock = SOCKET_I(inode);
2797 if (sock == NULL || sock->sk == NULL)
2800 ssp = sock->sk->sk_security;
2802 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2804 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2806 if (sock->sk->sk_family == PF_INET) {
2807 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2810 "Smack: \"%s\" netlbl error %d.\n",
2816 #ifdef SMACK_IPV6_PORT_LABELING
2817 if (sock->sk->sk_family == PF_INET6)
2818 smk_ipv6_port_label(sock, NULL);
2825 * smack_socket_post_create - finish socket setup
2827 * @family: protocol family
2832 * Sets the netlabel information on the socket
2834 * Returns 0 on success, and error code otherwise
2836 static int smack_socket_post_create(struct socket *sock, int family,
2837 int type, int protocol, int kern)
2839 struct socket_smack *ssp;
2841 if (sock->sk == NULL)
2845 * Sockets created by kernel threads receive web label.
2847 if (unlikely(current->flags & PF_KTHREAD)) {
2848 ssp = sock->sk->sk_security;
2849 ssp->smk_in = &smack_known_web;
2850 ssp->smk_out = &smack_known_web;
2853 if (family != PF_INET)
2856 * Set the outbound netlbl.
2858 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2861 #ifdef SMACK_IPV6_PORT_LABELING
2863 * smack_socket_bind - record port binding information.
2865 * @address: the port address
2866 * @addrlen: size of the address
2868 * Records the label bound to a port.
2872 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2875 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2876 smk_ipv6_port_label(sock, address);
2879 #endif /* SMACK_IPV6_PORT_LABELING */
2882 * smack_socket_connect - connect access check
2884 * @sap: the other end
2885 * @addrlen: size of sap
2887 * Verifies that a connection may be possible
2889 * Returns 0 on success, and error code otherwise
2891 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2895 #if IS_ENABLED(CONFIG_IPV6)
2896 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2898 #ifdef SMACK_IPV6_SECMARK_LABELING
2899 struct smack_known *rsp;
2900 struct socket_smack *ssp = sock->sk->sk_security;
2903 if (sock->sk == NULL)
2906 switch (sock->sk->sk_family) {
2908 if (addrlen < sizeof(struct sockaddr_in))
2910 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2913 if (addrlen < sizeof(struct sockaddr_in6))
2915 #ifdef SMACK_IPV6_SECMARK_LABELING
2916 rsp = smack_ipv6host_label(sip);
2918 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2921 #ifdef SMACK_IPV6_PORT_LABELING
2922 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2930 * smack_flags_to_may - convert S_ to MAY_ values
2931 * @flags: the S_ value
2933 * Returns the equivalent MAY_ value
2935 static int smack_flags_to_may(int flags)
2939 if (flags & S_IRUGO)
2941 if (flags & S_IWUGO)
2943 if (flags & S_IXUGO)
2950 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2955 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2957 struct smack_known *skp = smk_of_current();
2959 msg->security = skp;
2964 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2967 * Clears the blob pointer
2969 static void smack_msg_msg_free_security(struct msg_msg *msg)
2971 msg->security = NULL;
2975 * smack_of_shm - the smack pointer for the shm
2978 * Returns a pointer to the smack value
2980 static struct smack_known *smack_of_shm(struct shmid_kernel *shp)
2982 return (struct smack_known *)shp->shm_perm.security;
2986 * smack_shm_alloc_security - Set the security blob for shm
2991 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2993 struct kern_ipc_perm *isp = &shp->shm_perm;
2994 struct smack_known *skp = smk_of_current();
2996 isp->security = skp;
3001 * smack_shm_free_security - Clear the security blob for shm
3004 * Clears the blob pointer
3006 static void smack_shm_free_security(struct shmid_kernel *shp)
3008 struct kern_ipc_perm *isp = &shp->shm_perm;
3010 isp->security = NULL;
3014 * smk_curacc_shm : check if current has access on shm
3016 * @access : access requested
3018 * Returns 0 if current has the requested access, error code otherwise
3020 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
3022 struct smack_known *ssp = smack_of_shm(shp);
3023 struct smk_audit_info ad;
3027 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3028 ad.a.u.ipc_id = shp->shm_perm.id;
3030 rc = smk_curacc(ssp, access, &ad);
3031 rc = smk_bu_current("shm", ssp, access, rc);
3036 * smack_shm_associate - Smack access check for shm
3038 * @shmflg: access requested
3040 * Returns 0 if current has the requested access, error code otherwise
3042 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
3046 may = smack_flags_to_may(shmflg);
3047 return smk_curacc_shm(shp, may);
3051 * smack_shm_shmctl - Smack access check for shm
3053 * @cmd: what it wants to do
3055 * Returns 0 if current has the requested access, error code otherwise
3057 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
3070 may = MAY_READWRITE;
3075 * System level information.
3081 return smk_curacc_shm(shp, may);
3085 * smack_shm_shmat - Smack access for shmat
3088 * @shmflg: access requested
3090 * Returns 0 if current has the requested access, error code otherwise
3092 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
3097 may = smack_flags_to_may(shmflg);
3098 return smk_curacc_shm(shp, may);
3102 * smack_of_sem - the smack pointer for the sem
3105 * Returns a pointer to the smack value
3107 static struct smack_known *smack_of_sem(struct sem_array *sma)
3109 return (struct smack_known *)sma->sem_perm.security;
3113 * smack_sem_alloc_security - Set the security blob for sem
3118 static int smack_sem_alloc_security(struct sem_array *sma)
3120 struct kern_ipc_perm *isp = &sma->sem_perm;
3121 struct smack_known *skp = smk_of_current();
3123 isp->security = skp;
3128 * smack_sem_free_security - Clear the security blob for sem
3131 * Clears the blob pointer
3133 static void smack_sem_free_security(struct sem_array *sma)
3135 struct kern_ipc_perm *isp = &sma->sem_perm;
3137 isp->security = NULL;
3141 * smk_curacc_sem : check if current has access on sem
3143 * @access : access requested
3145 * Returns 0 if current has the requested access, error code otherwise
3147 static int smk_curacc_sem(struct sem_array *sma, int access)
3149 struct smack_known *ssp = smack_of_sem(sma);
3150 struct smk_audit_info ad;
3154 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3155 ad.a.u.ipc_id = sma->sem_perm.id;
3157 rc = smk_curacc(ssp, access, &ad);
3158 rc = smk_bu_current("sem", ssp, access, rc);
3163 * smack_sem_associate - Smack access check for sem
3165 * @semflg: access requested
3167 * Returns 0 if current has the requested access, error code otherwise
3169 static int smack_sem_associate(struct sem_array *sma, int semflg)
3173 may = smack_flags_to_may(semflg);
3174 return smk_curacc_sem(sma, may);
3178 * smack_sem_shmctl - Smack access check for sem
3180 * @cmd: what it wants to do
3182 * Returns 0 if current has the requested access, error code otherwise
3184 static int smack_sem_semctl(struct sem_array *sma, int cmd)
3202 may = MAY_READWRITE;
3207 * System level information
3214 return smk_curacc_sem(sma, may);
3218 * smack_sem_semop - Smack checks of semaphore operations
3224 * Treated as read and write in all cases.
3226 * Returns 0 if access is allowed, error code otherwise
3228 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
3229 unsigned nsops, int alter)
3231 return smk_curacc_sem(sma, MAY_READWRITE);
3235 * smack_msg_alloc_security - Set the security blob for msg
3240 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
3242 struct kern_ipc_perm *kisp = &msq->q_perm;
3243 struct smack_known *skp = smk_of_current();
3245 kisp->security = skp;
3250 * smack_msg_free_security - Clear the security blob for msg
3253 * Clears the blob pointer
3255 static void smack_msg_queue_free_security(struct msg_queue *msq)
3257 struct kern_ipc_perm *kisp = &msq->q_perm;
3259 kisp->security = NULL;
3263 * smack_of_msq - the smack pointer for the msq
3266 * Returns a pointer to the smack label entry
3268 static struct smack_known *smack_of_msq(struct msg_queue *msq)
3270 return (struct smack_known *)msq->q_perm.security;
3274 * smk_curacc_msq : helper to check if current has access on msq
3276 * @access : access requested
3278 * return 0 if current has access, error otherwise
3280 static int smk_curacc_msq(struct msg_queue *msq, int access)
3282 struct smack_known *msp = smack_of_msq(msq);
3283 struct smk_audit_info ad;
3287 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3288 ad.a.u.ipc_id = msq->q_perm.id;
3290 rc = smk_curacc(msp, access, &ad);
3291 rc = smk_bu_current("msq", msp, access, rc);
3296 * smack_msg_queue_associate - Smack access check for msg_queue
3298 * @msqflg: access requested
3300 * Returns 0 if current has the requested access, error code otherwise
3302 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
3306 may = smack_flags_to_may(msqflg);
3307 return smk_curacc_msq(msq, may);
3311 * smack_msg_queue_msgctl - Smack access check for msg_queue
3313 * @cmd: what it wants to do
3315 * Returns 0 if current has the requested access, error code otherwise
3317 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3328 may = MAY_READWRITE;
3333 * System level information
3340 return smk_curacc_msq(msq, may);
3344 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3347 * @msqflg: access requested
3349 * Returns 0 if current has the requested access, error code otherwise
3351 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
3356 may = smack_flags_to_may(msqflg);
3357 return smk_curacc_msq(msq, may);
3361 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3368 * Returns 0 if current has read and write access, error code otherwise
3370 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3371 struct task_struct *target, long type, int mode)
3373 return smk_curacc_msq(msq, MAY_READWRITE);
3377 * smack_ipc_permission - Smack access for ipc_permission()
3378 * @ipp: the object permissions
3379 * @flag: access requested
3381 * Returns 0 if current has read and write access, error code otherwise
3383 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3385 struct smack_known *iskp = ipp->security;
3386 int may = smack_flags_to_may(flag);
3387 struct smk_audit_info ad;
3391 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3392 ad.a.u.ipc_id = ipp->id;
3394 rc = smk_curacc(iskp, may, &ad);
3395 rc = smk_bu_current("svipc", iskp, may, rc);
3400 * smack_ipc_getsecid - Extract smack security id
3401 * @ipp: the object permissions
3402 * @secid: where result will be saved
3404 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3406 struct smack_known *iskp = ipp->security;
3408 *secid = iskp->smk_secid;
3412 * smack_d_instantiate - Make sure the blob is correct on an inode
3413 * @opt_dentry: dentry where inode will be attached
3414 * @inode: the object
3416 * Set the inode's security blob if it hasn't been done already.
3418 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3420 struct super_block *sbp;
3421 struct superblock_smack *sbsp;
3422 struct inode_smack *isp;
3423 struct smack_known *skp;
3424 struct smack_known *ckp = smk_of_current();
3425 struct smack_known *final;
3426 char trattr[TRANS_TRUE_SIZE];
3434 isp = inode->i_security;
3436 mutex_lock(&isp->smk_lock);
3438 * If the inode is already instantiated
3439 * take the quick way out
3441 if (isp->smk_flags & SMK_INODE_INSTANT)
3445 sbsp = sbp->s_security;
3447 * We're going to use the superblock default label
3448 * if there's no label on the file.
3450 final = sbsp->smk_default;
3453 * If this is the root inode the superblock
3454 * may be in the process of initialization.
3455 * If that is the case use the root value out
3456 * of the superblock.
3458 if (opt_dentry->d_parent == opt_dentry) {
3459 switch (sbp->s_magic) {
3460 case CGROUP_SUPER_MAGIC:
3462 * The cgroup filesystem is never mounted,
3463 * so there's no opportunity to set the mount
3466 sbsp->smk_root = &smack_known_star;
3467 sbsp->smk_default = &smack_known_star;
3468 isp->smk_inode = sbsp->smk_root;
3472 * What about shmem/tmpfs anonymous files with dentry
3473 * obtained from d_alloc_pseudo()?
3475 isp->smk_inode = smk_of_current();
3478 isp->smk_inode = smk_of_current();
3482 * Socket access is controlled by the socket
3483 * structures associated with the task involved.
3485 isp->smk_inode = &smack_known_star;
3488 isp->smk_inode = sbsp->smk_root;
3491 isp->smk_flags |= SMK_INODE_INSTANT;
3496 * This is pretty hackish.
3497 * Casey says that we shouldn't have to do
3498 * file system specific code, but it does help
3499 * with keeping it simple.
3501 switch (sbp->s_magic) {
3503 case CGROUP_SUPER_MAGIC:
3505 * Casey says that it's a little embarrassing
3506 * that the smack file system doesn't do
3507 * extended attributes.
3509 * Cgroupfs is special
3511 final = &smack_known_star;
3513 case DEVPTS_SUPER_MAGIC:
3515 * devpts seems content with the label of the task.
3516 * Programs that change smack have to treat the
3521 case PROC_SUPER_MAGIC:
3523 * Casey says procfs appears not to care.
3524 * The superblock default suffices.
3529 * Device labels should come from the filesystem,
3530 * but watch out, because they're volitile,
3531 * getting recreated on every reboot.
3533 final = &smack_known_star;
3537 * If a smack value has been set we want to use it,
3538 * but since tmpfs isn't giving us the opportunity
3539 * to set mount options simulate setting the
3540 * superblock default.
3544 * This isn't an understood special case.
3545 * Get the value from the xattr.
3549 * UNIX domain sockets use lower level socket data.
3551 if (S_ISSOCK(inode->i_mode)) {
3552 final = &smack_known_star;
3556 * No xattr support means, alas, no SMACK label.
3557 * Use the aforeapplied default.
3558 * It would be curious if the label of the task
3559 * does not match that assigned.
3561 if (!(inode->i_opflags & IOP_XATTR))
3564 * Get the dentry for xattr.
3566 dp = dget(opt_dentry);
3567 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3568 if (!IS_ERR_OR_NULL(skp))
3572 * Transmuting directory
3574 if (S_ISDIR(inode->i_mode)) {
3576 * If this is a new directory and the label was
3577 * transmuted when the inode was initialized
3578 * set the transmute attribute on the directory
3579 * and mark the inode.
3581 * If there is a transmute attribute on the
3582 * directory mark the inode.
3584 if (isp->smk_flags & SMK_INODE_CHANGED) {
3585 isp->smk_flags &= ~SMK_INODE_CHANGED;
3586 rc = __vfs_setxattr(dp, inode,
3587 XATTR_NAME_SMACKTRANSMUTE,
3588 TRANS_TRUE, TRANS_TRUE_SIZE,
3591 rc = __vfs_getxattr(dp, inode,
3592 XATTR_NAME_SMACKTRANSMUTE, trattr,
3594 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3595 TRANS_TRUE_SIZE) != 0)
3599 transflag = SMK_INODE_TRANSMUTE;
3602 * Don't let the exec or mmap label be "*" or "@".
3604 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3605 if (IS_ERR(skp) || skp == &smack_known_star ||
3606 skp == &smack_known_web)
3608 isp->smk_task = skp;
3610 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3611 if (IS_ERR(skp) || skp == &smack_known_star ||
3612 skp == &smack_known_web)
3614 isp->smk_mmap = skp;
3621 isp->smk_inode = ckp;
3623 isp->smk_inode = final;
3625 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3628 mutex_unlock(&isp->smk_lock);
3633 * smack_getprocattr - Smack process attribute access
3634 * @p: the object task
3635 * @name: the name of the attribute in /proc/.../attr
3636 * @value: where to put the result
3638 * Places a copy of the task Smack into value
3640 * Returns the length of the smack label or an error code
3642 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3644 struct smack_known *skp = smk_of_task_struct(p);
3648 if (strcmp(name, "current") != 0)
3651 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3661 * smack_setprocattr - Smack process attribute setting
3662 * @name: the name of the attribute in /proc/.../attr
3663 * @value: the value to set
3664 * @size: the size of the value
3666 * Sets the Smack value of the task. Only setting self
3667 * is permitted and only with privilege
3669 * Returns the length of the smack label or an error code
3671 static int smack_setprocattr(const char *name, void *value, size_t size)
3673 struct task_smack *tsp = current_security();
3675 struct smack_known *skp;
3676 struct smack_known_list_elem *sklep;
3679 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3682 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3685 if (strcmp(name, "current") != 0)
3688 skp = smk_import_entry(value, size);
3690 return PTR_ERR(skp);
3693 * No process is ever allowed the web ("@") label
3694 * and the star ("*") label.
3696 if (skp == &smack_known_web || skp == &smack_known_star)
3699 if (!smack_privileged(CAP_MAC_ADMIN)) {
3701 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3702 if (sklep->smk_label == skp) {
3710 new = prepare_creds();
3714 tsp = new->security;
3715 tsp->smk_task = skp;
3717 * process can change its label only once
3719 smk_destroy_label_list(&tsp->smk_relabel);
3726 * smack_unix_stream_connect - Smack access on UDS
3728 * @other: the other sock
3731 * Return 0 if a subject with the smack of sock could access
3732 * an object with the smack of other, otherwise an error code
3734 static int smack_unix_stream_connect(struct sock *sock,
3735 struct sock *other, struct sock *newsk)
3737 struct smack_known *skp;
3738 struct smack_known *okp;
3739 struct socket_smack *ssp = sock->sk_security;
3740 struct socket_smack *osp = other->sk_security;
3741 struct socket_smack *nsp = newsk->sk_security;
3742 struct smk_audit_info ad;
3745 struct lsm_network_audit net;
3748 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3752 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3753 smk_ad_setfield_u_net_sk(&ad, other);
3755 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3756 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3760 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3761 rc = smk_bu_note("UDS connect", okp, skp,
3767 * Cross reference the peer labels for SO_PEERSEC.
3770 nsp->smk_packet = ssp->smk_out;
3771 ssp->smk_packet = osp->smk_out;
3778 * smack_unix_may_send - Smack access on UDS
3780 * @other: the other socket
3782 * Return 0 if a subject with the smack of sock could access
3783 * an object with the smack of other, otherwise an error code
3785 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3787 struct socket_smack *ssp = sock->sk->sk_security;
3788 struct socket_smack *osp = other->sk->sk_security;
3789 struct smk_audit_info ad;
3793 struct lsm_network_audit net;
3795 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3796 smk_ad_setfield_u_net_sk(&ad, other->sk);
3799 if (smack_privileged(CAP_MAC_OVERRIDE))
3802 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3803 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3808 * smack_socket_sendmsg - Smack check based on destination host
3811 * @size: the size of the message
3813 * Return 0 if the current subject can write to the destination host.
3814 * For IPv4 this is only a question if the destination is a single label host.
3815 * For IPv6 this is a check against the label of the port.
3817 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3820 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3821 #if IS_ENABLED(CONFIG_IPV6)
3822 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3824 #ifdef SMACK_IPV6_SECMARK_LABELING
3825 struct socket_smack *ssp = sock->sk->sk_security;
3826 struct smack_known *rsp;
3831 * Perfectly reasonable for this to be NULL
3836 switch (sock->sk->sk_family) {
3838 rc = smack_netlabel_send(sock->sk, sip);
3841 #ifdef SMACK_IPV6_SECMARK_LABELING
3842 rsp = smack_ipv6host_label(sap);
3844 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3847 #ifdef SMACK_IPV6_PORT_LABELING
3848 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3856 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3857 * @sap: netlabel secattr
3858 * @ssp: socket security information
3860 * Returns a pointer to a Smack label entry found on the label list.
3862 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3863 struct socket_smack *ssp)
3865 struct smack_known *skp;
3870 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3872 * Looks like a CIPSO packet.
3873 * If there are flags but no level netlabel isn't
3874 * behaving the way we expect it to.
3876 * Look it up in the label table
3877 * Without guidance regarding the smack value
3878 * for the packet fall back on the network
3882 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3883 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3886 * Compare the catsets. Use the netlbl APIs.
3888 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3889 if ((skp->smk_netlabel.flags &
3890 NETLBL_SECATTR_MLS_CAT) == 0)
3894 for (acat = -1, kcat = -1; acat == kcat; ) {
3895 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3897 kcat = netlbl_catmap_walk(
3898 skp->smk_netlabel.attr.mls.cat,
3900 if (acat < 0 || kcat < 0)
3913 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3914 return &smack_known_web;
3915 return &smack_known_star;
3917 if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3919 * Looks like a fallback, which gives us a secid.
3921 return smack_from_secid(sap->attr.secid);
3923 * Without guidance regarding the smack value
3924 * for the packet fall back on the network
3927 return smack_net_ambient;
3930 #if IS_ENABLED(CONFIG_IPV6)
3931 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3935 int proto = -EINVAL;
3936 struct ipv6hdr _ipv6h;
3937 struct ipv6hdr *ip6;
3939 struct tcphdr _tcph, *th;
3940 struct udphdr _udph, *uh;
3941 struct dccp_hdr _dccph, *dh;
3945 offset = skb_network_offset(skb);
3946 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3949 sip->sin6_addr = ip6->saddr;
3951 nexthdr = ip6->nexthdr;
3952 offset += sizeof(_ipv6h);
3953 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3960 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3962 sip->sin6_port = th->source;
3965 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3967 sip->sin6_port = uh->source;
3970 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3972 sip->sin6_port = dh->dccph_sport;
3977 #endif /* CONFIG_IPV6 */
3980 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3984 * Returns 0 if the packet should be delivered, an error code otherwise
3986 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3988 struct netlbl_lsm_secattr secattr;
3989 struct socket_smack *ssp = sk->sk_security;
3990 struct smack_known *skp = NULL;
3992 struct smk_audit_info ad;
3994 struct lsm_network_audit net;
3996 #if IS_ENABLED(CONFIG_IPV6)
3997 struct sockaddr_in6 sadd;
3999 #endif /* CONFIG_IPV6 */
4001 switch (sk->sk_family) {
4003 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4005 * If there is a secmark use it rather than the CIPSO label.
4006 * If there is no secmark fall back to CIPSO.
4007 * The secmark is assumed to reflect policy better.
4009 if (skb && skb->secmark != 0) {
4010 skp = smack_from_secid(skb->secmark);
4013 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4015 * Translate what netlabel gave us.
4017 netlbl_secattr_init(&secattr);
4019 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
4021 skp = smack_from_secattr(&secattr, ssp);
4023 skp = smack_net_ambient;
4025 netlbl_secattr_destroy(&secattr);
4027 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4031 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4032 ad.a.u.net->family = sk->sk_family;
4033 ad.a.u.net->netif = skb->skb_iif;
4034 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4037 * Receiving a packet requires that the other end
4038 * be able to write here. Read access is not required.
4039 * This is the simplist possible security model
4042 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4043 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
4046 netlbl_skbuff_err(skb, sk->sk_family, rc, 0);
4048 #if IS_ENABLED(CONFIG_IPV6)
4050 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4051 if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
4053 #ifdef SMACK_IPV6_SECMARK_LABELING
4054 if (skb && skb->secmark != 0)
4055 skp = smack_from_secid(skb->secmark);
4057 skp = smack_ipv6host_label(&sadd);
4059 skp = smack_net_ambient;
4061 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4062 ad.a.u.net->family = sk->sk_family;
4063 ad.a.u.net->netif = skb->skb_iif;
4064 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4065 #endif /* CONFIG_AUDIT */
4066 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4067 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4069 #endif /* SMACK_IPV6_SECMARK_LABELING */
4070 #ifdef SMACK_IPV6_PORT_LABELING
4071 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4072 #endif /* SMACK_IPV6_PORT_LABELING */
4074 #endif /* CONFIG_IPV6 */
4081 * smack_socket_getpeersec_stream - pull in packet label
4083 * @optval: user's destination
4084 * @optlen: size thereof
4087 * returns zero on success, an error code otherwise
4089 static int smack_socket_getpeersec_stream(struct socket *sock,
4090 char __user *optval,
4091 int __user *optlen, unsigned len)
4093 struct socket_smack *ssp;
4098 ssp = sock->sk->sk_security;
4099 if (ssp->smk_packet != NULL) {
4100 rcp = ssp->smk_packet->smk_known;
4101 slen = strlen(rcp) + 1;
4106 else if (copy_to_user(optval, rcp, slen) != 0)
4109 if (put_user(slen, optlen) != 0)
4117 * smack_socket_getpeersec_dgram - pull in packet label
4118 * @sock: the peer socket
4120 * @secid: pointer to where to put the secid of the packet
4122 * Sets the netlabel socket state on sk from parent
4124 static int smack_socket_getpeersec_dgram(struct socket *sock,
4125 struct sk_buff *skb, u32 *secid)
4128 struct netlbl_lsm_secattr secattr;
4129 struct socket_smack *ssp = NULL;
4130 struct smack_known *skp;
4131 int family = PF_UNSPEC;
4132 u32 s = 0; /* 0 is the invalid secid */
4136 if (skb->protocol == htons(ETH_P_IP))
4138 #if IS_ENABLED(CONFIG_IPV6)
4139 else if (skb->protocol == htons(ETH_P_IPV6))
4141 #endif /* CONFIG_IPV6 */
4143 if (family == PF_UNSPEC && sock != NULL)
4144 family = sock->sk->sk_family;
4148 ssp = sock->sk->sk_security;
4149 s = ssp->smk_out->smk_secid;
4152 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4158 * Translate what netlabel gave us.
4160 if (sock != NULL && sock->sk != NULL)
4161 ssp = sock->sk->sk_security;
4162 netlbl_secattr_init(&secattr);
4163 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4165 skp = smack_from_secattr(&secattr, ssp);
4168 netlbl_secattr_destroy(&secattr);
4171 #ifdef SMACK_IPV6_SECMARK_LABELING
4183 * smack_sock_graft - Initialize a newly created socket with an existing sock
4185 * @parent: parent socket
4187 * Set the smk_{in,out} state of an existing sock based on the process that
4188 * is creating the new socket.
4190 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4192 struct socket_smack *ssp;
4193 struct smack_known *skp = smk_of_current();
4196 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4199 ssp = sk->sk_security;
4202 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4206 * smack_inet_conn_request - Smack access check on connect
4207 * @sk: socket involved
4211 * Returns 0 if a task with the packet label could write to
4212 * the socket, otherwise an error code
4214 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4215 struct request_sock *req)
4217 u16 family = sk->sk_family;
4218 struct smack_known *skp;
4219 struct socket_smack *ssp = sk->sk_security;
4220 struct netlbl_lsm_secattr secattr;
4221 struct sockaddr_in addr;
4223 struct smack_known *hskp;
4225 struct smk_audit_info ad;
4227 struct lsm_network_audit net;
4230 #if IS_ENABLED(CONFIG_IPV6)
4231 if (family == PF_INET6) {
4233 * Handle mapped IPv4 packets arriving
4234 * via IPv6 sockets. Don't set up netlabel
4235 * processing on IPv6.
4237 if (skb->protocol == htons(ETH_P_IP))
4242 #endif /* CONFIG_IPV6 */
4244 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4246 * If there is a secmark use it rather than the CIPSO label.
4247 * If there is no secmark fall back to CIPSO.
4248 * The secmark is assumed to reflect policy better.
4250 if (skb && skb->secmark != 0) {
4251 skp = smack_from_secid(skb->secmark);
4254 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4256 netlbl_secattr_init(&secattr);
4257 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4259 skp = smack_from_secattr(&secattr, ssp);
4261 skp = &smack_known_huh;
4262 netlbl_secattr_destroy(&secattr);
4264 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4269 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4270 ad.a.u.net->family = family;
4271 ad.a.u.net->netif = skb->skb_iif;
4272 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4275 * Receiving a packet requires that the other end be able to write
4276 * here. Read access is not required.
4278 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4279 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4284 * Save the peer's label in the request_sock so we can later setup
4285 * smk_packet in the child socket so that SO_PEERCRED can report it.
4287 req->peer_secid = skp->smk_secid;
4290 * We need to decide if we want to label the incoming connection here
4291 * if we do we only need to label the request_sock and the stack will
4292 * propagate the wire-label to the sock when it is created.
4295 addr.sin_addr.s_addr = hdr->saddr;
4297 hskp = smack_ipv4host_label(&addr);
4301 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4303 netlbl_req_delattr(req);
4309 * smack_inet_csk_clone - Copy the connection information to the new socket
4310 * @sk: the new socket
4311 * @req: the connection's request_sock
4313 * Transfer the connection's peer label to the newly created socket.
4315 static void smack_inet_csk_clone(struct sock *sk,
4316 const struct request_sock *req)
4318 struct socket_smack *ssp = sk->sk_security;
4319 struct smack_known *skp;
4321 if (req->peer_secid != 0) {
4322 skp = smack_from_secid(req->peer_secid);
4323 ssp->smk_packet = skp;
4325 ssp->smk_packet = NULL;
4329 * Key management security hooks
4331 * Casey has not tested key support very heavily.
4332 * The permission check is most likely too restrictive.
4333 * If you care about keys please have a look.
4338 * smack_key_alloc - Set the key security blob
4340 * @cred: the credentials to use
4343 * No allocation required
4347 static int smack_key_alloc(struct key *key, const struct cred *cred,
4348 unsigned long flags)
4350 struct smack_known *skp = smk_of_task(cred->security);
4352 key->security = skp;
4357 * smack_key_free - Clear the key security blob
4360 * Clear the blob pointer
4362 static void smack_key_free(struct key *key)
4364 key->security = NULL;
4368 * smack_key_permission - Smack access on a key
4369 * @key_ref: gets to the object
4370 * @cred: the credentials to use
4371 * @perm: requested key permissions
4373 * Return 0 if the task has read and write to the object,
4374 * an error code otherwise
4376 static int smack_key_permission(key_ref_t key_ref,
4377 const struct cred *cred, unsigned perm)
4380 struct smk_audit_info ad;
4381 struct smack_known *tkp = smk_of_task(cred->security);
4385 keyp = key_ref_to_ptr(key_ref);
4389 * If the key hasn't been initialized give it access so that
4392 if (keyp->security == NULL)
4395 * This should not occur
4400 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4401 ad.a.u.key_struct.key = keyp->serial;
4402 ad.a.u.key_struct.key_desc = keyp->description;
4404 if (perm & KEY_NEED_READ)
4406 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4407 request = MAY_WRITE;
4408 rc = smk_access(tkp, keyp->security, request, &ad);
4409 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4414 * smack_key_getsecurity - Smack label tagging the key
4415 * @key points to the key to be queried
4416 * @_buffer points to a pointer that should be set to point to the
4417 * resulting string (if no label or an error occurs).
4418 * Return the length of the string (including terminating NUL) or -ve if
4420 * May also return 0 (and a NULL buffer pointer) if there is no label.
4422 static int smack_key_getsecurity(struct key *key, char **_buffer)
4424 struct smack_known *skp = key->security;
4428 if (key->security == NULL) {
4433 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4436 length = strlen(copy) + 1;
4442 #endif /* CONFIG_KEYS */
4447 * Audit requires a unique representation of each Smack specific
4448 * rule. This unique representation is used to distinguish the
4449 * object to be audited from remaining kernel objects and also
4450 * works as a glue between the audit hooks.
4452 * Since repository entries are added but never deleted, we'll use
4453 * the smack_known label address related to the given audit rule as
4454 * the needed unique representation. This also better fits the smack
4455 * model where nearly everything is a label.
4460 * smack_audit_rule_init - Initialize a smack audit rule
4461 * @field: audit rule fields given from user-space (audit.h)
4462 * @op: required testing operator (=, !=, >, <, ...)
4463 * @rulestr: smack label to be audited
4464 * @vrule: pointer to save our own audit rule representation
4466 * Prepare to audit cases where (@field @op @rulestr) is true.
4467 * The label to be audited is created if necessay.
4469 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4471 struct smack_known *skp;
4472 char **rule = (char **)vrule;
4475 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4478 if (op != Audit_equal && op != Audit_not_equal)
4481 skp = smk_import_entry(rulestr, 0);
4483 return PTR_ERR(skp);
4485 *rule = skp->smk_known;
4491 * smack_audit_rule_known - Distinguish Smack audit rules
4492 * @krule: rule of interest, in Audit kernel representation format
4494 * This is used to filter Smack rules from remaining Audit ones.
4495 * If it's proved that this rule belongs to us, the
4496 * audit_rule_match hook will be called to do the final judgement.
4498 static int smack_audit_rule_known(struct audit_krule *krule)
4500 struct audit_field *f;
4503 for (i = 0; i < krule->field_count; i++) {
4504 f = &krule->fields[i];
4506 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4514 * smack_audit_rule_match - Audit given object ?
4515 * @secid: security id for identifying the object to test
4516 * @field: audit rule flags given from user-space
4517 * @op: required testing operator
4518 * @vrule: smack internal rule presentation
4519 * @actx: audit context associated with the check
4521 * The core Audit hook. It's used to take the decision of
4522 * whether to audit or not to audit a given object.
4524 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
4525 struct audit_context *actx)
4527 struct smack_known *skp;
4530 if (unlikely(!rule)) {
4531 WARN_ONCE(1, "Smack: missing rule\n");
4535 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4538 skp = smack_from_secid(secid);
4541 * No need to do string comparisons. If a match occurs,
4542 * both pointers will point to the same smack_known
4545 if (op == Audit_equal)
4546 return (rule == skp->smk_known);
4547 if (op == Audit_not_equal)
4548 return (rule != skp->smk_known);
4554 * There is no need for a smack_audit_rule_free hook.
4555 * No memory was allocated.
4558 #endif /* CONFIG_AUDIT */
4561 * smack_ismaclabel - check if xattr @name references a smack MAC label
4562 * @name: Full xattr name to check.
4564 static int smack_ismaclabel(const char *name)
4566 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4571 * smack_secid_to_secctx - return the smack label for a secid
4572 * @secid: incoming integer
4573 * @secdata: destination
4574 * @seclen: how long it is
4576 * Exists for networking code.
4578 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4580 struct smack_known *skp = smack_from_secid(secid);
4583 *secdata = skp->smk_known;
4584 *seclen = strlen(skp->smk_known);
4589 * smack_secctx_to_secid - return the secid for a smack label
4590 * @secdata: smack label
4591 * @seclen: how long result is
4592 * @secid: outgoing integer
4594 * Exists for audit and networking code.
4596 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4598 struct smack_known *skp = smk_find_entry(secdata);
4601 *secid = skp->smk_secid;
4608 * There used to be a smack_release_secctx hook
4609 * that did nothing back when hooks were in a vector.
4610 * Now that there's a list such a hook adds cost.
4613 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4615 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4618 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4620 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4623 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4626 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
4634 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
4635 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4636 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4637 LSM_HOOK_INIT(syslog, smack_syslog),
4639 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4640 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4641 LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
4642 LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
4643 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4644 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4645 LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
4647 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4648 LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds),
4649 LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec),
4651 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4652 LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
4653 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4654 LSM_HOOK_INIT(inode_link, smack_inode_link),
4655 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4656 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4657 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4658 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4659 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4660 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4661 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4662 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4663 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4664 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4665 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4666 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4667 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4668 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4670 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4671 LSM_HOOK_INIT(file_free_security, smack_file_free_security),
4672 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4673 LSM_HOOK_INIT(file_lock, smack_file_lock),
4674 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4675 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4676 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4677 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4678 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4679 LSM_HOOK_INIT(file_receive, smack_file_receive),
4681 LSM_HOOK_INIT(file_open, smack_file_open),
4683 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4684 LSM_HOOK_INIT(cred_free, smack_cred_free),
4685 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4686 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4687 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4688 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4689 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4690 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4691 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4692 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4693 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4694 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4695 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4696 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4697 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4698 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4699 LSM_HOOK_INIT(task_kill, smack_task_kill),
4700 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4702 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4703 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4705 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4706 LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
4708 LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security),
4709 LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security),
4710 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4711 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4712 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4713 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4715 LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security),
4716 LSM_HOOK_INIT(shm_free_security, smack_shm_free_security),
4717 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4718 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4719 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4721 LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security),
4722 LSM_HOOK_INIT(sem_free_security, smack_sem_free_security),
4723 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4724 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4725 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4727 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4729 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4730 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4732 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4733 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4735 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4736 #ifdef SMACK_IPV6_PORT_LABELING
4737 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4739 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4740 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4741 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4742 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4743 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4744 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4745 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4746 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4747 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4748 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4750 /* key management security hooks */
4752 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4753 LSM_HOOK_INIT(key_free, smack_key_free),
4754 LSM_HOOK_INIT(key_permission, smack_key_permission),
4755 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4756 #endif /* CONFIG_KEYS */
4760 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4761 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4762 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4763 #endif /* CONFIG_AUDIT */
4765 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4766 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4767 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4768 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4769 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4770 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4774 static __init void init_smack_known_list(void)
4777 * Initialize rule list locks
4779 mutex_init(&smack_known_huh.smk_rules_lock);
4780 mutex_init(&smack_known_hat.smk_rules_lock);
4781 mutex_init(&smack_known_floor.smk_rules_lock);
4782 mutex_init(&smack_known_star.smk_rules_lock);
4783 mutex_init(&smack_known_web.smk_rules_lock);
4785 * Initialize rule lists
4787 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4788 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4789 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4790 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4791 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4793 * Create the known labels list
4795 smk_insert_entry(&smack_known_huh);
4796 smk_insert_entry(&smack_known_hat);
4797 smk_insert_entry(&smack_known_star);
4798 smk_insert_entry(&smack_known_floor);
4799 smk_insert_entry(&smack_known_web);
4803 * smack_init - initialize the smack system
4807 static __init int smack_init(void)
4810 struct task_smack *tsp;
4812 if (!security_module_enable("smack"))
4815 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4816 if (!smack_inode_cache)
4819 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
4822 kmem_cache_destroy(smack_inode_cache);
4828 pr_info("Smack: Initializing.\n");
4829 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4830 pr_info("Smack: Netfilter enabled.\n");
4832 #ifdef SMACK_IPV6_PORT_LABELING
4833 pr_info("Smack: IPv6 port labeling enabled.\n");
4835 #ifdef SMACK_IPV6_SECMARK_LABELING
4836 pr_info("Smack: IPv6 Netfilter enabled.\n");
4840 * Set the security state for the initial task.
4842 cred = (struct cred *) current->cred;
4843 cred->security = tsp;
4845 /* initialize the smack_known_list */
4846 init_smack_known_list();
4851 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
4857 * Smack requires early initialization in order to label
4858 * all processes and objects when they are created.
4860 security_initcall(smack_init);