1 // SPDX-License-Identifier: GPL-2.0-only
3 * Simplified MAC Kernel (smack) security module
5 * This file contains the smack hook function implementations.
8 * Casey Schaufler <casey@schaufler-ca.com>
9 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
11 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
12 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
13 * Paul Moore <paul@paul-moore.com>
14 * Copyright (C) 2010 Nokia Corporation
15 * Copyright (C) 2011 Intel Corporation.
18 #include <linux/xattr.h>
19 #include <linux/pagemap.h>
20 #include <linux/mount.h>
21 #include <linux/stat.h>
23 #include <asm/ioctls.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/dccp.h>
28 #include <linux/icmpv6.h>
29 #include <linux/slab.h>
30 #include <linux/mutex.h>
31 #include <linux/pipe_fs_i.h>
32 #include <net/cipso_ipv4.h>
35 #include <linux/audit.h>
36 #include <linux/magic.h>
37 #include <linux/dcache.h>
38 #include <linux/personality.h>
39 #include <linux/msg.h>
40 #include <linux/shm.h>
41 #include <linux/binfmts.h>
42 #include <linux/parser.h>
43 #include <linux/fs_context.h>
44 #include <linux/fs_parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 static DEFINE_MUTEX(smack_ipv6_lock);
55 static LIST_HEAD(smk_ipv6_port_list);
56 static struct kmem_cache *smack_inode_cache;
57 struct kmem_cache *smack_rule_cache;
60 #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
65 } smk_mount_opts[] = {
66 {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault},
67 A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute)
71 static int match_opt_prefix(char *s, int l, char **arg)
75 for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {
76 size_t len = smk_mount_opts[i].len;
77 if (len > l || memcmp(s, smk_mount_opts[i].name, len))
79 if (len == l || s[len] != '=')
82 return smk_mount_opts[i].opt;
87 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
88 static char *smk_bu_mess[] = {
89 "Bringup Error", /* Unused */
90 "Bringup", /* SMACK_BRINGUP_ALLOW */
91 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
92 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
95 static void smk_bu_mode(int mode, char *s)
101 if (mode & MAY_WRITE)
105 if (mode & MAY_APPEND)
107 if (mode & MAY_TRANSMUTE)
117 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
118 static int smk_bu_note(char *note, struct smack_known *sskp,
119 struct smack_known *oskp, int mode, int rc)
121 char acc[SMK_NUM_ACCESS_TYPE + 1];
125 if (rc > SMACK_UNCONFINED_OBJECT)
128 smk_bu_mode(mode, acc);
129 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
130 sskp->smk_known, oskp->smk_known, acc, note);
134 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
137 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
138 static int smk_bu_current(char *note, struct smack_known *oskp,
141 struct task_smack *tsp = smack_cred(current_cred());
142 char acc[SMK_NUM_ACCESS_TYPE + 1];
146 if (rc > SMACK_UNCONFINED_OBJECT)
149 smk_bu_mode(mode, acc);
150 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
151 tsp->smk_task->smk_known, oskp->smk_known,
152 acc, current->comm, note);
156 #define smk_bu_current(note, oskp, mode, RC) (RC)
159 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
160 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
162 struct task_smack *tsp = smack_cred(current_cred());
163 struct smack_known *smk_task = smk_of_task_struct(otp);
164 char acc[SMK_NUM_ACCESS_TYPE + 1];
168 if (rc > SMACK_UNCONFINED_OBJECT)
171 smk_bu_mode(mode, acc);
172 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
173 tsp->smk_task->smk_known, smk_task->smk_known, acc,
174 current->comm, otp->comm);
178 #define smk_bu_task(otp, mode, RC) (RC)
181 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
182 static int smk_bu_inode(struct inode *inode, int mode, int rc)
184 struct task_smack *tsp = smack_cred(current_cred());
185 struct inode_smack *isp = smack_inode(inode);
186 char acc[SMK_NUM_ACCESS_TYPE + 1];
188 if (isp->smk_flags & SMK_INODE_IMPURE)
189 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
190 inode->i_sb->s_id, inode->i_ino, current->comm);
194 if (rc > SMACK_UNCONFINED_OBJECT)
196 if (rc == SMACK_UNCONFINED_SUBJECT &&
197 (mode & (MAY_WRITE | MAY_APPEND)))
198 isp->smk_flags |= SMK_INODE_IMPURE;
200 smk_bu_mode(mode, acc);
202 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
203 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
204 inode->i_sb->s_id, inode->i_ino, current->comm);
208 #define smk_bu_inode(inode, mode, RC) (RC)
211 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
212 static int smk_bu_file(struct file *file, int mode, int rc)
214 struct task_smack *tsp = smack_cred(current_cred());
215 struct smack_known *sskp = tsp->smk_task;
216 struct inode *inode = file_inode(file);
217 struct inode_smack *isp = smack_inode(inode);
218 char acc[SMK_NUM_ACCESS_TYPE + 1];
220 if (isp->smk_flags & SMK_INODE_IMPURE)
221 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
222 inode->i_sb->s_id, inode->i_ino, current->comm);
226 if (rc > SMACK_UNCONFINED_OBJECT)
229 smk_bu_mode(mode, acc);
230 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
231 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
232 inode->i_sb->s_id, inode->i_ino, file,
237 #define smk_bu_file(file, mode, RC) (RC)
240 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
241 static int smk_bu_credfile(const struct cred *cred, struct file *file,
244 struct task_smack *tsp = smack_cred(cred);
245 struct smack_known *sskp = tsp->smk_task;
246 struct inode *inode = file_inode(file);
247 struct inode_smack *isp = smack_inode(inode);
248 char acc[SMK_NUM_ACCESS_TYPE + 1];
250 if (isp->smk_flags & SMK_INODE_IMPURE)
251 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
252 inode->i_sb->s_id, inode->i_ino, current->comm);
256 if (rc > SMACK_UNCONFINED_OBJECT)
259 smk_bu_mode(mode, acc);
260 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
261 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
262 inode->i_sb->s_id, inode->i_ino, file,
267 #define smk_bu_credfile(cred, file, mode, RC) (RC)
271 * smk_fetch - Fetch the smack label from a file.
272 * @name: type of the label (attribute)
273 * @ip: a pointer to the inode
274 * @dp: a pointer to the dentry
276 * Returns a pointer to the master list entry for the Smack label,
277 * NULL if there was no label to fetch, or an error code.
279 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
284 struct smack_known *skp = NULL;
286 if (!(ip->i_opflags & IOP_XATTR))
287 return ERR_PTR(-EOPNOTSUPP);
289 buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS);
291 return ERR_PTR(-ENOMEM);
293 rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
299 skp = smk_import_entry(buffer, rc);
307 * init_inode_smack - initialize an inode security blob
308 * @inode: inode to extract the info from
309 * @skp: a pointer to the Smack label entry to use in the blob
312 static void init_inode_smack(struct inode *inode, struct smack_known *skp)
314 struct inode_smack *isp = smack_inode(inode);
316 isp->smk_inode = skp;
318 mutex_init(&isp->smk_lock);
322 * init_task_smack - initialize a task security blob
323 * @tsp: blob to initialize
324 * @task: a pointer to the Smack label for the running task
325 * @forked: a pointer to the Smack label for the forked task
328 static void init_task_smack(struct task_smack *tsp, struct smack_known *task,
329 struct smack_known *forked)
331 tsp->smk_task = task;
332 tsp->smk_forked = forked;
333 INIT_LIST_HEAD(&tsp->smk_rules);
334 INIT_LIST_HEAD(&tsp->smk_relabel);
335 mutex_init(&tsp->smk_rules_lock);
339 * smk_copy_rules - copy a rule set
340 * @nhead: new rules header pointer
341 * @ohead: old rules header pointer
342 * @gfp: type of the memory for the allocation
344 * Returns 0 on success, -ENOMEM on error
346 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
349 struct smack_rule *nrp;
350 struct smack_rule *orp;
353 list_for_each_entry_rcu(orp, ohead, list) {
354 nrp = kmem_cache_zalloc(smack_rule_cache, gfp);
360 list_add_rcu(&nrp->list, nhead);
366 * smk_copy_relabel - copy smk_relabel labels list
367 * @nhead: new rules header pointer
368 * @ohead: old rules header pointer
369 * @gfp: type of the memory for the allocation
371 * Returns 0 on success, -ENOMEM on error
373 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
376 struct smack_known_list_elem *nklep;
377 struct smack_known_list_elem *oklep;
379 list_for_each_entry(oklep, ohead, list) {
380 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
382 smk_destroy_label_list(nhead);
385 nklep->smk_label = oklep->smk_label;
386 list_add(&nklep->list, nhead);
393 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
394 * @mode - input mode in form of PTRACE_MODE_*
396 * Returns a converted MAY_* mode usable by smack rules
398 static inline unsigned int smk_ptrace_mode(unsigned int mode)
400 if (mode & PTRACE_MODE_ATTACH)
401 return MAY_READWRITE;
402 if (mode & PTRACE_MODE_READ)
409 * smk_ptrace_rule_check - helper for ptrace access
410 * @tracer: tracer process
411 * @tracee_known: label entry of the process that's about to be traced
412 * @mode: ptrace attachment mode (PTRACE_MODE_*)
413 * @func: name of the function that called us, used for audit
415 * Returns 0 on access granted, -error on error
417 static int smk_ptrace_rule_check(struct task_struct *tracer,
418 struct smack_known *tracee_known,
419 unsigned int mode, const char *func)
422 struct smk_audit_info ad, *saip = NULL;
423 struct task_smack *tsp;
424 struct smack_known *tracer_known;
425 const struct cred *tracercred;
427 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
428 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
429 smk_ad_setfield_u_tsk(&ad, tracer);
434 tracercred = __task_cred(tracer);
435 tsp = smack_cred(tracercred);
436 tracer_known = smk_of_task(tsp);
438 if ((mode & PTRACE_MODE_ATTACH) &&
439 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
440 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
441 if (tracer_known->smk_known == tracee_known->smk_known)
443 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
445 else if (smack_ptrace_rule == SMACK_PTRACE_EXACT)
446 rc = capable(CAP_SYS_PTRACE) != 0 ? 0 : -EACCES;
447 else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred))
453 smack_log(tracer_known->smk_known,
454 tracee_known->smk_known,
461 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
462 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
470 * We he, that is fun!
474 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
475 * @ctp: child task pointer
476 * @mode: ptrace attachment mode (PTRACE_MODE_*)
478 * Returns 0 if access is OK, an error code otherwise
480 * Do the capability checks.
482 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
484 struct smack_known *skp;
486 skp = smk_of_task_struct(ctp);
488 return smk_ptrace_rule_check(current, skp, mode, __func__);
492 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
493 * @ptp: parent task pointer
495 * Returns 0 if access is OK, an error code otherwise
497 * Do the capability checks, and require PTRACE_MODE_ATTACH.
499 static int smack_ptrace_traceme(struct task_struct *ptp)
502 struct smack_known *skp;
504 skp = smk_of_task(smack_cred(current_cred()));
506 rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
511 * smack_syslog - Smack approval on syslog
512 * @typefrom_file: unused
514 * Returns 0 on success, error code otherwise.
516 static int smack_syslog(int typefrom_file)
519 struct smack_known *skp = smk_of_current();
521 if (smack_privileged(CAP_MAC_OVERRIDE))
524 if (smack_syslog_label != NULL && smack_syslog_label != skp)
535 * smack_sb_alloc_security - allocate a superblock blob
536 * @sb: the superblock getting the blob
538 * Returns 0 on success or -ENOMEM on error.
540 static int smack_sb_alloc_security(struct super_block *sb)
542 struct superblock_smack *sbsp;
544 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
549 sbsp->smk_root = &smack_known_floor;
550 sbsp->smk_default = &smack_known_floor;
551 sbsp->smk_floor = &smack_known_floor;
552 sbsp->smk_hat = &smack_known_hat;
554 * SMK_SB_INITIALIZED will be zero from kzalloc.
556 sb->s_security = sbsp;
562 * smack_sb_free_security - free a superblock blob
563 * @sb: the superblock getting the blob
566 static void smack_sb_free_security(struct super_block *sb)
568 kfree(sb->s_security);
569 sb->s_security = NULL;
572 struct smack_mnt_opts {
573 const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute;
576 static void smack_free_mnt_opts(void *mnt_opts)
578 struct smack_mnt_opts *opts = mnt_opts;
579 kfree(opts->fsdefault);
580 kfree(opts->fsfloor);
583 kfree(opts->fstransmute);
587 static int smack_add_opt(int token, const char *s, void **mnt_opts)
589 struct smack_mnt_opts *opts = *mnt_opts;
592 opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
621 case Opt_fstransmute:
622 if (opts->fstransmute)
624 opts->fstransmute = s;
630 pr_warn("Smack: duplicate mount options\n");
635 * smack_fs_context_dup - Duplicate the security data on fs_context duplication
636 * @fc: The new filesystem context.
637 * @src_fc: The source filesystem context being duplicated.
639 * Returns 0 on success or -ENOMEM on error.
641 static int smack_fs_context_dup(struct fs_context *fc,
642 struct fs_context *src_fc)
644 struct smack_mnt_opts *dst, *src = src_fc->security;
649 fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
654 if (src->fsdefault) {
655 dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL);
660 dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL);
665 dst->fshat = kstrdup(src->fshat, GFP_KERNEL);
670 dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL);
674 if (src->fstransmute) {
675 dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL);
676 if (!dst->fstransmute)
682 static const struct fs_parameter_spec smack_param_specs[] = {
683 fsparam_string("smackfsdef", Opt_fsdefault),
684 fsparam_string("smackfsdefault", Opt_fsdefault),
685 fsparam_string("smackfsfloor", Opt_fsfloor),
686 fsparam_string("smackfshat", Opt_fshat),
687 fsparam_string("smackfsroot", Opt_fsroot),
688 fsparam_string("smackfstransmute", Opt_fstransmute),
692 static const struct fs_parameter_description smack_fs_parameters = {
694 .specs = smack_param_specs,
698 * smack_fs_context_parse_param - Parse a single mount parameter
699 * @fc: The new filesystem context being constructed.
700 * @param: The parameter.
702 * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on
705 static int smack_fs_context_parse_param(struct fs_context *fc,
706 struct fs_parameter *param)
708 struct fs_parse_result result;
711 opt = fs_parse(fc, &smack_fs_parameters, param, &result);
715 rc = smack_add_opt(opt, param->string, &fc->security);
717 param->string = NULL;
721 static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
723 char *from = options, *to = options;
727 char *next = strchr(from, ',');
736 token = match_opt_prefix(from, len, &arg);
737 if (token != Opt_error) {
738 arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);
739 rc = smack_add_opt(token, arg, mnt_opts);
743 smack_free_mnt_opts(*mnt_opts);
748 if (!first) { // copy with preceding comma
753 memmove(to, from, len);
766 * smack_set_mnt_opts - set Smack specific mount options
767 * @sb: the file system superblock
768 * @mnt_opts: Smack mount options
769 * @kern_flags: mount option from kernel space or user space
770 * @set_kern_flags: where to store converted mount opts
772 * Returns 0 on success, an error code on failure
774 * Allow filesystems with binary mount data to explicitly set Smack mount
777 static int smack_set_mnt_opts(struct super_block *sb,
779 unsigned long kern_flags,
780 unsigned long *set_kern_flags)
782 struct dentry *root = sb->s_root;
783 struct inode *inode = d_backing_inode(root);
784 struct superblock_smack *sp = sb->s_security;
785 struct inode_smack *isp;
786 struct smack_known *skp;
787 struct smack_mnt_opts *opts = mnt_opts;
788 bool transmute = false;
790 if (sp->smk_flags & SMK_SB_INITIALIZED)
793 if (inode->i_security == NULL) {
794 int rc = lsm_inode_alloc(inode);
800 if (!smack_privileged(CAP_MAC_ADMIN)) {
802 * Unprivileged mounts don't get to specify Smack values.
807 * Unprivileged mounts get root and default from the caller.
809 skp = smk_of_current();
811 sp->smk_default = skp;
813 * For a handful of fs types with no user-controlled
814 * backing store it's okay to trust security labels
815 * in the filesystem. The rest are untrusted.
817 if (sb->s_user_ns != &init_user_ns &&
818 sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
819 sb->s_magic != RAMFS_MAGIC) {
821 sp->smk_flags |= SMK_SB_UNTRUSTED;
825 sp->smk_flags |= SMK_SB_INITIALIZED;
828 if (opts->fsdefault) {
829 skp = smk_import_entry(opts->fsdefault, 0);
832 sp->smk_default = skp;
835 skp = smk_import_entry(opts->fsfloor, 0);
841 skp = smk_import_entry(opts->fshat, 0);
847 skp = smk_import_entry(opts->fsroot, 0);
852 if (opts->fstransmute) {
853 skp = smk_import_entry(opts->fstransmute, 0);
862 * Initialize the root inode.
864 init_inode_smack(inode, sp->smk_root);
867 isp = smack_inode(inode);
868 isp->smk_flags |= SMK_INODE_TRANSMUTE;
875 * smack_sb_statfs - Smack check on statfs
876 * @dentry: identifies the file system in question
878 * Returns 0 if current can read the floor of the filesystem,
879 * and error code otherwise
881 static int smack_sb_statfs(struct dentry *dentry)
883 struct superblock_smack *sbp = dentry->d_sb->s_security;
885 struct smk_audit_info ad;
887 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
888 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
890 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
891 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
900 * smack_bprm_set_creds - set creds for exec
901 * @bprm: the exec information
903 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
905 static int smack_bprm_set_creds(struct linux_binprm *bprm)
907 struct inode *inode = file_inode(bprm->file);
908 struct task_smack *bsp = smack_cred(bprm->cred);
909 struct inode_smack *isp;
910 struct superblock_smack *sbsp;
913 if (bprm->called_set_creds)
916 isp = smack_inode(inode);
917 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
920 sbsp = inode->i_sb->s_security;
921 if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
922 isp->smk_task != sbsp->smk_root)
925 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
926 struct task_struct *tracer;
930 tracer = ptrace_parent(current);
931 if (likely(tracer != NULL))
932 rc = smk_ptrace_rule_check(tracer,
941 if (bprm->unsafe & ~LSM_UNSAFE_PTRACE)
944 bsp->smk_task = isp->smk_task;
945 bprm->per_clear |= PER_CLEAR_ON_SETID;
947 /* Decide if this is a secure exec. */
948 if (bsp->smk_task != bsp->smk_forked)
949 bprm->secureexec = 1;
959 * smack_inode_alloc_security - allocate an inode blob
960 * @inode: the inode in need of a blob
964 static int smack_inode_alloc_security(struct inode *inode)
966 struct smack_known *skp = smk_of_current();
968 init_inode_smack(inode, skp);
973 * smack_inode_init_security - copy out the smack from an inode
974 * @inode: the newly created inode
975 * @dir: containing directory object
977 * @name: where to put the attribute name
978 * @value: where to put the attribute value
979 * @len: where to put the length of the attribute
981 * Returns 0 if it all works out, -ENOMEM if there's no memory
983 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
984 const struct qstr *qstr, const char **name,
985 void **value, size_t *len)
987 struct inode_smack *issp = smack_inode(inode);
988 struct smack_known *skp = smk_of_current();
989 struct smack_known *isp = smk_of_inode(inode);
990 struct smack_known *dsp = smk_of_inode(dir);
994 *name = XATTR_SMACK_SUFFIX;
998 may = smk_access_entry(skp->smk_known, dsp->smk_known,
1003 * If the access rule allows transmutation and
1004 * the directory requests transmutation then
1005 * by all means transmute.
1006 * Mark the inode as changed.
1008 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
1009 smk_inode_transmutable(dir)) {
1011 issp->smk_flags |= SMK_INODE_CHANGED;
1014 *value = kstrdup(isp->smk_known, GFP_NOFS);
1018 *len = strlen(isp->smk_known);
1025 * smack_inode_link - Smack check on link
1026 * @old_dentry: the existing object
1028 * @new_dentry: the new object
1030 * Returns 0 if access is permitted, an error code otherwise
1032 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
1033 struct dentry *new_dentry)
1035 struct smack_known *isp;
1036 struct smk_audit_info ad;
1039 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1040 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1042 isp = smk_of_inode(d_backing_inode(old_dentry));
1043 rc = smk_curacc(isp, MAY_WRITE, &ad);
1044 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1046 if (rc == 0 && d_is_positive(new_dentry)) {
1047 isp = smk_of_inode(d_backing_inode(new_dentry));
1048 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1049 rc = smk_curacc(isp, MAY_WRITE, &ad);
1050 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1057 * smack_inode_unlink - Smack check on inode deletion
1058 * @dir: containing directory object
1059 * @dentry: file to unlink
1061 * Returns 0 if current can write the containing directory
1062 * and the object, error code otherwise
1064 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1066 struct inode *ip = d_backing_inode(dentry);
1067 struct smk_audit_info ad;
1070 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1071 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1074 * You need write access to the thing you're unlinking
1076 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1077 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1080 * You also need write access to the containing directory
1082 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1083 smk_ad_setfield_u_fs_inode(&ad, dir);
1084 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1085 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1091 * smack_inode_rmdir - Smack check on directory deletion
1092 * @dir: containing directory object
1093 * @dentry: directory to unlink
1095 * Returns 0 if current can write the containing directory
1096 * and the directory, error code otherwise
1098 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1100 struct smk_audit_info ad;
1103 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1104 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1107 * You need write access to the thing you're removing
1109 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1110 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1113 * You also need write access to the containing directory
1115 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1116 smk_ad_setfield_u_fs_inode(&ad, dir);
1117 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1118 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1125 * smack_inode_rename - Smack check on rename
1126 * @old_inode: unused
1127 * @old_dentry: the old object
1128 * @new_inode: unused
1129 * @new_dentry: the new object
1131 * Read and write access is required on both the old and
1134 * Returns 0 if access is permitted, an error code otherwise
1136 static int smack_inode_rename(struct inode *old_inode,
1137 struct dentry *old_dentry,
1138 struct inode *new_inode,
1139 struct dentry *new_dentry)
1142 struct smack_known *isp;
1143 struct smk_audit_info ad;
1145 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1146 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1148 isp = smk_of_inode(d_backing_inode(old_dentry));
1149 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1150 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1152 if (rc == 0 && d_is_positive(new_dentry)) {
1153 isp = smk_of_inode(d_backing_inode(new_dentry));
1154 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1155 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1156 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1162 * smack_inode_permission - Smack version of permission()
1163 * @inode: the inode in question
1164 * @mask: the access requested
1166 * This is the important Smack hook.
1168 * Returns 0 if access is permitted, an error code otherwise
1170 static int smack_inode_permission(struct inode *inode, int mask)
1172 struct superblock_smack *sbsp = inode->i_sb->s_security;
1173 struct smk_audit_info ad;
1174 int no_block = mask & MAY_NOT_BLOCK;
1177 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1179 * No permission to check. Existence test. Yup, it's there.
1184 if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1185 if (smk_of_inode(inode) != sbsp->smk_root)
1189 /* May be droppable after audit */
1192 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1193 smk_ad_setfield_u_fs_inode(&ad, inode);
1194 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1195 rc = smk_bu_inode(inode, mask, rc);
1200 * smack_inode_setattr - Smack check for setting attributes
1201 * @dentry: the object
1202 * @iattr: for the force flag
1204 * Returns 0 if access is permitted, an error code otherwise
1206 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1208 struct smk_audit_info ad;
1212 * Need to allow for clearing the setuid bit.
1214 if (iattr->ia_valid & ATTR_FORCE)
1216 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1217 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1219 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1220 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1225 * smack_inode_getattr - Smack check for getting attributes
1226 * @path: path to extract the info from
1228 * Returns 0 if access is permitted, an error code otherwise
1230 static int smack_inode_getattr(const struct path *path)
1232 struct smk_audit_info ad;
1233 struct inode *inode = d_backing_inode(path->dentry);
1236 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1237 smk_ad_setfield_u_fs_path(&ad, *path);
1238 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1239 rc = smk_bu_inode(inode, MAY_READ, rc);
1244 * smack_inode_setxattr - Smack check for setting xattrs
1245 * @dentry: the object
1246 * @name: name of the attribute
1247 * @value: value of the attribute
1248 * @size: size of the value
1251 * This protects the Smack attribute explicitly.
1253 * Returns 0 if access is permitted, an error code otherwise
1255 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
1256 const void *value, size_t size, int flags)
1258 struct smk_audit_info ad;
1259 struct smack_known *skp;
1261 int check_import = 0;
1266 * Check label validity here so import won't fail in post_setxattr
1268 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1269 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1270 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1273 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1274 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1278 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1280 if (size != TRANS_TRUE_SIZE ||
1281 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1284 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1286 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1289 if (rc == 0 && check_import) {
1290 skp = size ? smk_import_entry(value, size) : NULL;
1293 else if (skp == NULL || (check_star &&
1294 (skp == &smack_known_star || skp == &smack_known_web)))
1298 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1299 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1302 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1303 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1310 * smack_inode_post_setxattr - Apply the Smack update approved above
1312 * @name: attribute name
1313 * @value: attribute value
1314 * @size: attribute size
1317 * Set the pointer in the inode blob to the entry found
1318 * in the master label list.
1320 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1321 const void *value, size_t size, int flags)
1323 struct smack_known *skp;
1324 struct inode_smack *isp = smack_inode(d_backing_inode(dentry));
1326 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1327 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1331 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1332 skp = smk_import_entry(value, size);
1334 isp->smk_inode = skp;
1335 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1336 skp = smk_import_entry(value, size);
1338 isp->smk_task = skp;
1339 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1340 skp = smk_import_entry(value, size);
1342 isp->smk_mmap = skp;
1349 * smack_inode_getxattr - Smack check on getxattr
1350 * @dentry: the object
1353 * Returns 0 if access is permitted, an error code otherwise
1355 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1357 struct smk_audit_info ad;
1360 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1361 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1363 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1364 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1369 * smack_inode_removexattr - Smack check on removexattr
1370 * @dentry: the object
1371 * @name: name of the attribute
1373 * Removing the Smack attribute requires CAP_MAC_ADMIN
1375 * Returns 0 if access is permitted, an error code otherwise
1377 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
1379 struct inode_smack *isp;
1380 struct smk_audit_info ad;
1383 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1384 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1385 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1386 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1387 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1388 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1389 if (!smack_privileged(CAP_MAC_ADMIN))
1392 rc = cap_inode_removexattr(dentry, name);
1397 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1398 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1400 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1401 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1405 isp = smack_inode(d_backing_inode(dentry));
1407 * Don't do anything special for these.
1408 * XATTR_NAME_SMACKIPIN
1409 * XATTR_NAME_SMACKIPOUT
1411 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1412 struct super_block *sbp = dentry->d_sb;
1413 struct superblock_smack *sbsp = sbp->s_security;
1415 isp->smk_inode = sbsp->smk_default;
1416 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1417 isp->smk_task = NULL;
1418 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1419 isp->smk_mmap = NULL;
1420 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1421 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1427 * smack_inode_getsecurity - get smack xattrs
1428 * @inode: the object
1429 * @name: attribute name
1430 * @buffer: where to put the result
1431 * @alloc: duplicate memory
1433 * Returns the size of the attribute or an error code
1435 static int smack_inode_getsecurity(struct inode *inode,
1436 const char *name, void **buffer,
1439 struct socket_smack *ssp;
1440 struct socket *sock;
1441 struct super_block *sbp;
1442 struct inode *ip = (struct inode *)inode;
1443 struct smack_known *isp;
1445 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
1446 isp = smk_of_inode(inode);
1449 * The rest of the Smack xattrs are only on sockets.
1452 if (sbp->s_magic != SOCKFS_MAGIC)
1455 sock = SOCKET_I(ip);
1456 if (sock == NULL || sock->sk == NULL)
1459 ssp = sock->sk->sk_security;
1461 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1463 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1470 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1471 if (*buffer == NULL)
1475 return strlen(isp->smk_known);
1480 * smack_inode_listsecurity - list the Smack attributes
1481 * @inode: the object
1482 * @buffer: where they go
1483 * @buffer_size: size of buffer
1485 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1488 int len = sizeof(XATTR_NAME_SMACK);
1490 if (buffer != NULL && len <= buffer_size)
1491 memcpy(buffer, XATTR_NAME_SMACK, len);
1497 * smack_inode_getsecid - Extract inode's security id
1498 * @inode: inode to extract the info from
1499 * @secid: where result will be saved
1501 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1503 struct smack_known *skp = smk_of_inode(inode);
1505 *secid = skp->smk_secid;
1513 * There is no smack_file_permission hook
1515 * Should access checks be done on each read or write?
1516 * UNICOS and SELinux say yes.
1517 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1519 * I'll say no for now. Smack does not do the frequent
1520 * label changing that SELinux does.
1524 * smack_file_alloc_security - assign a file security blob
1527 * The security blob for a file is a pointer to the master
1528 * label list, so no allocation is done.
1530 * f_security is the owner security information. It
1531 * isn't used on file access checks, it's for send_sigio.
1535 static int smack_file_alloc_security(struct file *file)
1537 struct smack_known **blob = smack_file(file);
1539 *blob = smk_of_current();
1544 * smack_file_ioctl - Smack check on ioctls
1549 * Relies heavily on the correct use of the ioctl command conventions.
1551 * Returns 0 if allowed, error code otherwise
1553 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1557 struct smk_audit_info ad;
1558 struct inode *inode = file_inode(file);
1560 if (unlikely(IS_PRIVATE(inode)))
1563 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1564 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1566 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1567 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1568 rc = smk_bu_file(file, MAY_WRITE, rc);
1571 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1572 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1573 rc = smk_bu_file(file, MAY_READ, rc);
1580 * smack_file_lock - Smack check on file locking
1584 * Returns 0 if current has lock access, error code otherwise
1586 static int smack_file_lock(struct file *file, unsigned int cmd)
1588 struct smk_audit_info ad;
1590 struct inode *inode = file_inode(file);
1592 if (unlikely(IS_PRIVATE(inode)))
1595 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1596 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1597 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1598 rc = smk_bu_file(file, MAY_LOCK, rc);
1603 * smack_file_fcntl - Smack check on fcntl
1605 * @cmd: what action to check
1608 * Generally these operations are harmless.
1609 * File locking operations present an obvious mechanism
1610 * for passing information, so they require write access.
1612 * Returns 0 if current has access, error code otherwise
1614 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1617 struct smk_audit_info ad;
1619 struct inode *inode = file_inode(file);
1621 if (unlikely(IS_PRIVATE(inode)))
1629 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1630 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1631 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1632 rc = smk_bu_file(file, MAY_LOCK, rc);
1636 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1637 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1638 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1639 rc = smk_bu_file(file, MAY_WRITE, rc);
1650 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1651 * if mapping anonymous memory.
1652 * @file contains the file structure for file to map (may be NULL).
1653 * @reqprot contains the protection requested by the application.
1654 * @prot contains the protection that will be applied by the kernel.
1655 * @flags contains the operational flags.
1656 * Return 0 if permission is granted.
1658 static int smack_mmap_file(struct file *file,
1659 unsigned long reqprot, unsigned long prot,
1660 unsigned long flags)
1662 struct smack_known *skp;
1663 struct smack_known *mkp;
1664 struct smack_rule *srp;
1665 struct task_smack *tsp;
1666 struct smack_known *okp;
1667 struct inode_smack *isp;
1668 struct superblock_smack *sbsp;
1677 if (unlikely(IS_PRIVATE(file_inode(file))))
1680 isp = smack_inode(file_inode(file));
1681 if (isp->smk_mmap == NULL)
1683 sbsp = file_inode(file)->i_sb->s_security;
1684 if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1685 isp->smk_mmap != sbsp->smk_root)
1687 mkp = isp->smk_mmap;
1689 tsp = smack_cred(current_cred());
1690 skp = smk_of_current();
1695 * For each Smack rule associated with the subject
1696 * label verify that the SMACK64MMAP also has access
1697 * to that rule's object label.
1699 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1700 okp = srp->smk_object;
1702 * Matching labels always allows access.
1704 if (mkp->smk_known == okp->smk_known)
1707 * If there is a matching local rule take
1708 * that into account as well.
1710 may = smk_access_entry(srp->smk_subject->smk_known,
1714 may = srp->smk_access;
1716 may &= srp->smk_access;
1718 * If may is zero the SMACK64MMAP subject can't
1719 * possibly have less access.
1725 * Fetch the global list entry.
1726 * If there isn't one a SMACK64MMAP subject
1727 * can't have as much access as current.
1729 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1731 if (mmay == -ENOENT) {
1736 * If there is a local entry it modifies the
1737 * potential access, too.
1739 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1741 if (tmay != -ENOENT)
1745 * If there is any access available to current that is
1746 * not available to a SMACK64MMAP subject
1749 if ((may | mmay) != mmay) {
1761 * smack_file_set_fowner - set the file security blob value
1762 * @file: object in question
1765 static void smack_file_set_fowner(struct file *file)
1767 struct smack_known **blob = smack_file(file);
1769 *blob = smk_of_current();
1773 * smack_file_send_sigiotask - Smack on sigio
1774 * @tsk: The target task
1775 * @fown: the object the signal come from
1778 * Allow a privileged task to get signals even if it shouldn't
1780 * Returns 0 if a subject with the object's smack could
1781 * write to the task, an error code otherwise.
1783 static int smack_file_send_sigiotask(struct task_struct *tsk,
1784 struct fown_struct *fown, int signum)
1786 struct smack_known **blob;
1787 struct smack_known *skp;
1788 struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
1789 const struct cred *tcred;
1792 struct smk_audit_info ad;
1795 * struct fown_struct is never outside the context of a struct file
1797 file = container_of(fown, struct file, f_owner);
1799 /* we don't log here as rc can be overriden */
1800 blob = smack_file(file);
1802 rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1803 rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1806 tcred = __task_cred(tsk);
1807 if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred))
1811 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1812 smk_ad_setfield_u_tsk(&ad, tsk);
1813 smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1818 * smack_file_receive - Smack file receive check
1821 * Returns 0 if current has access, error code otherwise
1823 static int smack_file_receive(struct file *file)
1827 struct smk_audit_info ad;
1828 struct inode *inode = file_inode(file);
1829 struct socket *sock;
1830 struct task_smack *tsp;
1831 struct socket_smack *ssp;
1833 if (unlikely(IS_PRIVATE(inode)))
1836 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1837 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1839 if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
1840 sock = SOCKET_I(inode);
1841 ssp = sock->sk->sk_security;
1842 tsp = smack_cred(current_cred());
1844 * If the receiving process can't write to the
1845 * passed socket or if the passed socket can't
1846 * write to the receiving process don't accept
1847 * the passed socket.
1849 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1850 rc = smk_bu_file(file, may, rc);
1853 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1854 rc = smk_bu_file(file, may, rc);
1858 * This code relies on bitmasks.
1860 if (file->f_mode & FMODE_READ)
1862 if (file->f_mode & FMODE_WRITE)
1865 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1866 rc = smk_bu_file(file, may, rc);
1871 * smack_file_open - Smack dentry open processing
1874 * Set the security blob in the file structure.
1875 * Allow the open only if the task has read access. There are
1876 * many read operations (e.g. fstat) that you can do with an
1877 * fd even if you have the file open write-only.
1879 * Returns 0 if current has access, error code otherwise
1881 static int smack_file_open(struct file *file)
1883 struct task_smack *tsp = smack_cred(file->f_cred);
1884 struct inode *inode = file_inode(file);
1885 struct smk_audit_info ad;
1888 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1889 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1890 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1891 rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc);
1901 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1902 * @cred: the new credentials
1903 * @gfp: the atomicity of any memory allocations
1905 * Prepare a blank set of credentials for modification. This must allocate all
1906 * the memory the LSM module might require such that cred_transfer() can
1907 * complete without error.
1909 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1911 init_task_smack(smack_cred(cred), NULL, NULL);
1917 * smack_cred_free - "free" task-level security credentials
1918 * @cred: the credentials in question
1921 static void smack_cred_free(struct cred *cred)
1923 struct task_smack *tsp = smack_cred(cred);
1924 struct smack_rule *rp;
1925 struct list_head *l;
1926 struct list_head *n;
1928 smk_destroy_label_list(&tsp->smk_relabel);
1930 list_for_each_safe(l, n, &tsp->smk_rules) {
1931 rp = list_entry(l, struct smack_rule, list);
1932 list_del(&rp->list);
1933 kmem_cache_free(smack_rule_cache, rp);
1938 * smack_cred_prepare - prepare new set of credentials for modification
1939 * @new: the new credentials
1940 * @old: the original credentials
1941 * @gfp: the atomicity of any memory allocations
1943 * Prepare a new set of credentials for modification.
1945 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1948 struct task_smack *old_tsp = smack_cred(old);
1949 struct task_smack *new_tsp = smack_cred(new);
1952 init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task);
1954 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1958 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
1964 * smack_cred_transfer - Transfer the old credentials to the new credentials
1965 * @new: the new credentials
1966 * @old: the original credentials
1968 * Fill in a set of blank credentials from another set of credentials.
1970 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1972 struct task_smack *old_tsp = smack_cred(old);
1973 struct task_smack *new_tsp = smack_cred(new);
1975 new_tsp->smk_task = old_tsp->smk_task;
1976 new_tsp->smk_forked = old_tsp->smk_task;
1977 mutex_init(&new_tsp->smk_rules_lock);
1978 INIT_LIST_HEAD(&new_tsp->smk_rules);
1980 /* cbs copy rule list */
1984 * smack_cred_getsecid - get the secid corresponding to a creds structure
1985 * @cred: the object creds
1986 * @secid: where to put the result
1988 * Sets the secid to contain a u32 version of the smack label.
1990 static void smack_cred_getsecid(const struct cred *cred, u32 *secid)
1992 struct smack_known *skp;
1995 skp = smk_of_task(smack_cred(cred));
1996 *secid = skp->smk_secid;
2001 * smack_kernel_act_as - Set the subjective context in a set of credentials
2002 * @new: points to the set of credentials to be modified.
2003 * @secid: specifies the security ID to be set
2005 * Set the security data for a kernel service.
2007 static int smack_kernel_act_as(struct cred *new, u32 secid)
2009 struct task_smack *new_tsp = smack_cred(new);
2011 new_tsp->smk_task = smack_from_secid(secid);
2016 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2017 * @new: points to the set of credentials to be modified
2018 * @inode: points to the inode to use as a reference
2020 * Set the file creation context in a set of credentials to the same
2021 * as the objective context of the specified inode
2023 static int smack_kernel_create_files_as(struct cred *new,
2024 struct inode *inode)
2026 struct inode_smack *isp = smack_inode(inode);
2027 struct task_smack *tsp = smack_cred(new);
2029 tsp->smk_forked = isp->smk_inode;
2030 tsp->smk_task = tsp->smk_forked;
2035 * smk_curacc_on_task - helper to log task related access
2036 * @p: the task object
2037 * @access: the access requested
2038 * @caller: name of the calling function for audit
2040 * Return 0 if access is permitted
2042 static int smk_curacc_on_task(struct task_struct *p, int access,
2045 struct smk_audit_info ad;
2046 struct smack_known *skp = smk_of_task_struct(p);
2049 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2050 smk_ad_setfield_u_tsk(&ad, p);
2051 rc = smk_curacc(skp, access, &ad);
2052 rc = smk_bu_task(p, access, rc);
2057 * smack_task_setpgid - Smack check on setting pgid
2058 * @p: the task object
2061 * Return 0 if write access is permitted
2063 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2065 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2069 * smack_task_getpgid - Smack access check for getpgid
2070 * @p: the object task
2072 * Returns 0 if current can read the object task, error code otherwise
2074 static int smack_task_getpgid(struct task_struct *p)
2076 return smk_curacc_on_task(p, MAY_READ, __func__);
2080 * smack_task_getsid - Smack access check for getsid
2081 * @p: the object task
2083 * Returns 0 if current can read the object task, error code otherwise
2085 static int smack_task_getsid(struct task_struct *p)
2087 return smk_curacc_on_task(p, MAY_READ, __func__);
2091 * smack_task_getsecid - get the secid of the task
2092 * @p: the object task
2093 * @secid: where to put the result
2095 * Sets the secid to contain a u32 version of the smack label.
2097 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
2099 struct smack_known *skp = smk_of_task_struct(p);
2101 *secid = skp->smk_secid;
2105 * smack_task_setnice - Smack check on setting nice
2106 * @p: the task object
2109 * Return 0 if write access is permitted
2111 static int smack_task_setnice(struct task_struct *p, int nice)
2113 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2117 * smack_task_setioprio - Smack check on setting ioprio
2118 * @p: the task object
2121 * Return 0 if write access is permitted
2123 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2125 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2129 * smack_task_getioprio - Smack check on reading ioprio
2130 * @p: the task object
2132 * Return 0 if read access is permitted
2134 static int smack_task_getioprio(struct task_struct *p)
2136 return smk_curacc_on_task(p, MAY_READ, __func__);
2140 * smack_task_setscheduler - Smack check on setting scheduler
2141 * @p: the task object
2143 * Return 0 if read access is permitted
2145 static int smack_task_setscheduler(struct task_struct *p)
2147 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2151 * smack_task_getscheduler - Smack check on reading scheduler
2152 * @p: the task object
2154 * Return 0 if read access is permitted
2156 static int smack_task_getscheduler(struct task_struct *p)
2158 return smk_curacc_on_task(p, MAY_READ, __func__);
2162 * smack_task_movememory - Smack check on moving memory
2163 * @p: the task object
2165 * Return 0 if write access is permitted
2167 static int smack_task_movememory(struct task_struct *p)
2169 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2173 * smack_task_kill - Smack check on signal delivery
2174 * @p: the task object
2177 * @cred: identifies the cred to use in lieu of current's
2179 * Return 0 if write access is permitted
2182 static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
2183 int sig, const struct cred *cred)
2185 struct smk_audit_info ad;
2186 struct smack_known *skp;
2187 struct smack_known *tkp = smk_of_task_struct(p);
2191 return 0; /* null signal; existence test */
2193 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2194 smk_ad_setfield_u_tsk(&ad, p);
2196 * Sending a signal requires that the sender
2197 * can write the receiver.
2200 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2201 rc = smk_bu_task(p, MAY_DELIVER, rc);
2205 * If the cred isn't NULL we're dealing with some USB IO
2206 * specific behavior. This is not clean. For one thing
2207 * we can't take privilege into account.
2209 skp = smk_of_task(smack_cred(cred));
2210 rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2211 rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2216 * smack_task_to_inode - copy task smack into the inode blob
2217 * @p: task to copy from
2218 * @inode: inode to copy to
2220 * Sets the smack pointer in the inode security blob
2222 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2224 struct inode_smack *isp = smack_inode(inode);
2225 struct smack_known *skp = smk_of_task_struct(p);
2227 isp->smk_inode = skp;
2228 isp->smk_flags |= SMK_INODE_INSTANT;
2236 * smack_sk_alloc_security - Allocate a socket blob
2239 * @gfp_flags: memory allocation flags
2241 * Assign Smack pointers to current
2243 * Returns 0 on success, -ENOMEM is there's no memory
2245 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2247 struct smack_known *skp = smk_of_current();
2248 struct socket_smack *ssp;
2250 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2255 * Sockets created by kernel threads receive web label.
2257 if (unlikely(current->flags & PF_KTHREAD)) {
2258 ssp->smk_in = &smack_known_web;
2259 ssp->smk_out = &smack_known_web;
2264 ssp->smk_packet = NULL;
2266 sk->sk_security = ssp;
2272 * smack_sk_free_security - Free a socket blob
2275 * Clears the blob pointer
2277 static void smack_sk_free_security(struct sock *sk)
2279 #ifdef SMACK_IPV6_PORT_LABELING
2280 struct smk_port_label *spp;
2282 if (sk->sk_family == PF_INET6) {
2284 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2285 if (spp->smk_sock != sk)
2287 spp->smk_can_reuse = 1;
2293 kfree(sk->sk_security);
2297 * smack_ipv4host_label - check host based restrictions
2298 * @sip: the object end
2300 * looks for host based access restrictions
2302 * This version will only be appropriate for really small sets of single label
2303 * hosts. The caller is responsible for ensuring that the RCU read lock is
2304 * taken before calling this function.
2306 * Returns the label of the far end or NULL if it's not special.
2308 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2310 struct smk_net4addr *snp;
2311 struct in_addr *siap = &sip->sin_addr;
2313 if (siap->s_addr == 0)
2316 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2318 * we break after finding the first match because
2319 * the list is sorted from longest to shortest mask
2320 * so we have found the most specific match
2322 if (snp->smk_host.s_addr ==
2323 (siap->s_addr & snp->smk_mask.s_addr))
2324 return snp->smk_label;
2330 * smk_ipv6_localhost - Check for local ipv6 host address
2333 * Returns boolean true if this is the localhost address
2335 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2337 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2338 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2340 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2341 ntohs(be16p[7]) == 1)
2347 * smack_ipv6host_label - check host based restrictions
2348 * @sip: the object end
2350 * looks for host based access restrictions
2352 * This version will only be appropriate for really small sets of single label
2353 * hosts. The caller is responsible for ensuring that the RCU read lock is
2354 * taken before calling this function.
2356 * Returns the label of the far end or NULL if it's not special.
2358 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2360 struct smk_net6addr *snp;
2361 struct in6_addr *sap = &sip->sin6_addr;
2366 * It's local. Don't look for a host label.
2368 if (smk_ipv6_localhost(sip))
2371 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2373 * If the label is NULL the entry has
2374 * been renounced. Ignore it.
2376 if (snp->smk_label == NULL)
2379 * we break after finding the first match because
2380 * the list is sorted from longest to shortest mask
2381 * so we have found the most specific match
2383 for (found = 1, i = 0; i < 8; i++) {
2384 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2385 snp->smk_host.s6_addr16[i]) {
2391 return snp->smk_label;
2398 * smack_netlabel - Set the secattr on a socket
2400 * @labeled: socket label scheme
2402 * Convert the outbound smack value (smk_out) to a
2403 * secattr and attach it to the socket.
2405 * Returns 0 on success or an error code
2407 static int smack_netlabel(struct sock *sk, int labeled)
2409 struct smack_known *skp;
2410 struct socket_smack *ssp = sk->sk_security;
2414 * Usually the netlabel code will handle changing the
2415 * packet labeling based on the label.
2416 * The case of a single label host is different, because
2417 * a single label host should never get a labeled packet
2418 * even though the label is usually associated with a packet
2422 bh_lock_sock_nested(sk);
2424 if (ssp->smk_out == smack_net_ambient ||
2425 labeled == SMACK_UNLABELED_SOCKET)
2426 netlbl_sock_delattr(sk);
2429 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2439 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2441 * @sap: the destination address
2443 * Set the correct secattr for the given socket based on the destination
2444 * address and perform any outbound access checks needed.
2446 * Returns 0 on success or an error code.
2449 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
2451 struct smack_known *skp;
2454 struct smack_known *hkp;
2455 struct socket_smack *ssp = sk->sk_security;
2456 struct smk_audit_info ad;
2459 hkp = smack_ipv4host_label(sap);
2462 struct lsm_network_audit net;
2464 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2465 ad.a.u.net->family = sap->sin_family;
2466 ad.a.u.net->dport = sap->sin_port;
2467 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2469 sk_lbl = SMACK_UNLABELED_SOCKET;
2471 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2472 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2474 sk_lbl = SMACK_CIPSO_SOCKET;
2481 return smack_netlabel(sk, sk_lbl);
2485 * smk_ipv6_check - check Smack access
2486 * @subject: subject Smack label
2487 * @object: object Smack label
2489 * @act: the action being taken
2491 * Check an IPv6 access
2493 static int smk_ipv6_check(struct smack_known *subject,
2494 struct smack_known *object,
2495 struct sockaddr_in6 *address, int act)
2498 struct lsm_network_audit net;
2500 struct smk_audit_info ad;
2504 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2505 ad.a.u.net->family = PF_INET6;
2506 ad.a.u.net->dport = ntohs(address->sin6_port);
2507 if (act == SMK_RECEIVING)
2508 ad.a.u.net->v6info.saddr = address->sin6_addr;
2510 ad.a.u.net->v6info.daddr = address->sin6_addr;
2512 rc = smk_access(subject, object, MAY_WRITE, &ad);
2513 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2517 #ifdef SMACK_IPV6_PORT_LABELING
2519 * smk_ipv6_port_label - Smack port access table management
2523 * Create or update the port list entry
2525 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2527 struct sock *sk = sock->sk;
2528 struct sockaddr_in6 *addr6;
2529 struct socket_smack *ssp = sock->sk->sk_security;
2530 struct smk_port_label *spp;
2531 unsigned short port = 0;
2533 if (address == NULL) {
2535 * This operation is changing the Smack information
2536 * on the bound socket. Take the changes to the port
2540 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2541 if (sk != spp->smk_sock)
2543 spp->smk_in = ssp->smk_in;
2544 spp->smk_out = ssp->smk_out;
2549 * A NULL address is only used for updating existing
2550 * bound entries. If there isn't one, it's OK.
2556 addr6 = (struct sockaddr_in6 *)address;
2557 port = ntohs(addr6->sin6_port);
2559 * This is a special case that is safely ignored.
2565 * Look for an existing port list entry.
2566 * This is an indication that a port is getting reused.
2569 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2570 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2572 if (spp->smk_can_reuse != 1) {
2576 spp->smk_port = port;
2578 spp->smk_in = ssp->smk_in;
2579 spp->smk_out = ssp->smk_out;
2580 spp->smk_can_reuse = 0;
2586 * A new port entry is required.
2588 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2592 spp->smk_port = port;
2594 spp->smk_in = ssp->smk_in;
2595 spp->smk_out = ssp->smk_out;
2596 spp->smk_sock_type = sock->type;
2597 spp->smk_can_reuse = 0;
2599 mutex_lock(&smack_ipv6_lock);
2600 list_add_rcu(&spp->list, &smk_ipv6_port_list);
2601 mutex_unlock(&smack_ipv6_lock);
2607 * smk_ipv6_port_check - check Smack port access
2610 * @act: the action being taken
2612 * Create or update the port list entry
2614 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2617 struct smk_port_label *spp;
2618 struct socket_smack *ssp = sk->sk_security;
2619 struct smack_known *skp = NULL;
2620 unsigned short port;
2621 struct smack_known *object;
2623 if (act == SMK_RECEIVING) {
2624 skp = smack_ipv6host_label(address);
2625 object = ssp->smk_in;
2628 object = smack_ipv6host_label(address);
2632 * The other end is a single label host.
2634 if (skp != NULL && object != NULL)
2635 return smk_ipv6_check(skp, object, address, act);
2637 skp = smack_net_ambient;
2639 object = smack_net_ambient;
2642 * It's remote, so port lookup does no good.
2644 if (!smk_ipv6_localhost(address))
2645 return smk_ipv6_check(skp, object, address, act);
2648 * It's local so the send check has to have passed.
2650 if (act == SMK_RECEIVING)
2653 port = ntohs(address->sin6_port);
2655 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2656 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2658 object = spp->smk_in;
2659 if (act == SMK_CONNECTING)
2660 ssp->smk_packet = spp->smk_out;
2665 return smk_ipv6_check(skp, object, address, act);
2669 * smack_inode_setsecurity - set smack xattrs
2670 * @inode: the object
2671 * @name: attribute name
2672 * @value: attribute value
2673 * @size: size of the attribute
2676 * Sets the named attribute in the appropriate blob
2678 * Returns 0 on success, or an error code
2680 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2681 const void *value, size_t size, int flags)
2683 struct smack_known *skp;
2684 struct inode_smack *nsp = smack_inode(inode);
2685 struct socket_smack *ssp;
2686 struct socket *sock;
2689 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2692 skp = smk_import_entry(value, size);
2694 return PTR_ERR(skp);
2696 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2697 nsp->smk_inode = skp;
2698 nsp->smk_flags |= SMK_INODE_INSTANT;
2702 * The rest of the Smack xattrs are only on sockets.
2704 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2707 sock = SOCKET_I(inode);
2708 if (sock == NULL || sock->sk == NULL)
2711 ssp = sock->sk->sk_security;
2713 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2715 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2717 if (sock->sk->sk_family == PF_INET) {
2718 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2721 "Smack: \"%s\" netlbl error %d.\n",
2727 #ifdef SMACK_IPV6_PORT_LABELING
2728 if (sock->sk->sk_family == PF_INET6)
2729 smk_ipv6_port_label(sock, NULL);
2736 * smack_socket_post_create - finish socket setup
2738 * @family: protocol family
2743 * Sets the netlabel information on the socket
2745 * Returns 0 on success, and error code otherwise
2747 static int smack_socket_post_create(struct socket *sock, int family,
2748 int type, int protocol, int kern)
2750 struct socket_smack *ssp;
2752 if (sock->sk == NULL)
2756 * Sockets created by kernel threads receive web label.
2758 if (unlikely(current->flags & PF_KTHREAD)) {
2759 ssp = sock->sk->sk_security;
2760 ssp->smk_in = &smack_known_web;
2761 ssp->smk_out = &smack_known_web;
2764 if (family != PF_INET)
2767 * Set the outbound netlbl.
2769 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2773 * smack_socket_socketpair - create socket pair
2774 * @socka: one socket
2775 * @sockb: another socket
2777 * Cross reference the peer labels for SO_PEERSEC
2781 static int smack_socket_socketpair(struct socket *socka,
2782 struct socket *sockb)
2784 struct socket_smack *asp = socka->sk->sk_security;
2785 struct socket_smack *bsp = sockb->sk->sk_security;
2787 asp->smk_packet = bsp->smk_out;
2788 bsp->smk_packet = asp->smk_out;
2793 #ifdef SMACK_IPV6_PORT_LABELING
2795 * smack_socket_bind - record port binding information.
2797 * @address: the port address
2798 * @addrlen: size of the address
2800 * Records the label bound to a port.
2802 * Returns 0 on success, and error code otherwise
2804 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2807 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) {
2808 if (addrlen < SIN6_LEN_RFC2133 ||
2809 address->sa_family != AF_INET6)
2811 smk_ipv6_port_label(sock, address);
2815 #endif /* SMACK_IPV6_PORT_LABELING */
2818 * smack_socket_connect - connect access check
2820 * @sap: the other end
2821 * @addrlen: size of sap
2823 * Verifies that a connection may be possible
2825 * Returns 0 on success, and error code otherwise
2827 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2832 if (sock->sk == NULL)
2834 if (sock->sk->sk_family != PF_INET &&
2835 (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6))
2837 if (addrlen < offsetofend(struct sockaddr, sa_family))
2839 if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) {
2840 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2841 struct smack_known *rsp = NULL;
2843 if (addrlen < SIN6_LEN_RFC2133)
2845 if (__is_defined(SMACK_IPV6_SECMARK_LABELING))
2846 rsp = smack_ipv6host_label(sip);
2848 struct socket_smack *ssp = sock->sk->sk_security;
2850 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2853 if (__is_defined(SMACK_IPV6_PORT_LABELING))
2854 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2858 if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
2860 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2865 * smack_flags_to_may - convert S_ to MAY_ values
2866 * @flags: the S_ value
2868 * Returns the equivalent MAY_ value
2870 static int smack_flags_to_may(int flags)
2874 if (flags & S_IRUGO)
2876 if (flags & S_IWUGO)
2878 if (flags & S_IXUGO)
2885 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2890 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2892 struct smack_known **blob = smack_msg_msg(msg);
2894 *blob = smk_of_current();
2899 * smack_of_ipc - the smack pointer for the ipc
2902 * Returns a pointer to the smack value
2904 static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
2906 struct smack_known **blob = smack_ipc(isp);
2912 * smack_ipc_alloc_security - Set the security blob for ipc
2917 static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
2919 struct smack_known **blob = smack_ipc(isp);
2921 *blob = smk_of_current();
2926 * smk_curacc_shm : check if current has access on shm
2928 * @access : access requested
2930 * Returns 0 if current has the requested access, error code otherwise
2932 static int smk_curacc_shm(struct kern_ipc_perm *isp, int access)
2934 struct smack_known *ssp = smack_of_ipc(isp);
2935 struct smk_audit_info ad;
2939 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2940 ad.a.u.ipc_id = isp->id;
2942 rc = smk_curacc(ssp, access, &ad);
2943 rc = smk_bu_current("shm", ssp, access, rc);
2948 * smack_shm_associate - Smack access check for shm
2950 * @shmflg: access requested
2952 * Returns 0 if current has the requested access, error code otherwise
2954 static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg)
2958 may = smack_flags_to_may(shmflg);
2959 return smk_curacc_shm(isp, may);
2963 * smack_shm_shmctl - Smack access check for shm
2965 * @cmd: what it wants to do
2967 * Returns 0 if current has the requested access, error code otherwise
2969 static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd)
2983 may = MAY_READWRITE;
2988 * System level information.
2994 return smk_curacc_shm(isp, may);
2998 * smack_shm_shmat - Smack access for shmat
3001 * @shmflg: access requested
3003 * Returns 0 if current has the requested access, error code otherwise
3005 static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr,
3010 may = smack_flags_to_may(shmflg);
3011 return smk_curacc_shm(isp, may);
3015 * smk_curacc_sem : check if current has access on sem
3017 * @access : access requested
3019 * Returns 0 if current has the requested access, error code otherwise
3021 static int smk_curacc_sem(struct kern_ipc_perm *isp, int access)
3023 struct smack_known *ssp = smack_of_ipc(isp);
3024 struct smk_audit_info ad;
3028 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3029 ad.a.u.ipc_id = isp->id;
3031 rc = smk_curacc(ssp, access, &ad);
3032 rc = smk_bu_current("sem", ssp, access, rc);
3037 * smack_sem_associate - Smack access check for sem
3039 * @semflg: access requested
3041 * Returns 0 if current has the requested access, error code otherwise
3043 static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg)
3047 may = smack_flags_to_may(semflg);
3048 return smk_curacc_sem(isp, may);
3052 * smack_sem_shmctl - Smack access check for sem
3054 * @cmd: what it wants to do
3056 * Returns 0 if current has the requested access, error code otherwise
3058 static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd)
3077 may = MAY_READWRITE;
3082 * System level information
3089 return smk_curacc_sem(isp, may);
3093 * smack_sem_semop - Smack checks of semaphore operations
3099 * Treated as read and write in all cases.
3101 * Returns 0 if access is allowed, error code otherwise
3103 static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
3104 unsigned nsops, int alter)
3106 return smk_curacc_sem(isp, MAY_READWRITE);
3110 * smk_curacc_msq : helper to check if current has access on msq
3112 * @access : access requested
3114 * return 0 if current has access, error otherwise
3116 static int smk_curacc_msq(struct kern_ipc_perm *isp, int access)
3118 struct smack_known *msp = smack_of_ipc(isp);
3119 struct smk_audit_info ad;
3123 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3124 ad.a.u.ipc_id = isp->id;
3126 rc = smk_curacc(msp, access, &ad);
3127 rc = smk_bu_current("msq", msp, access, rc);
3132 * smack_msg_queue_associate - Smack access check for msg_queue
3134 * @msqflg: access requested
3136 * Returns 0 if current has the requested access, error code otherwise
3138 static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg)
3142 may = smack_flags_to_may(msqflg);
3143 return smk_curacc_msq(isp, may);
3147 * smack_msg_queue_msgctl - Smack access check for msg_queue
3149 * @cmd: what it wants to do
3151 * Returns 0 if current has the requested access, error code otherwise
3153 static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd)
3165 may = MAY_READWRITE;
3170 * System level information
3177 return smk_curacc_msq(isp, may);
3181 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3184 * @msqflg: access requested
3186 * Returns 0 if current has the requested access, error code otherwise
3188 static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg,
3193 may = smack_flags_to_may(msqflg);
3194 return smk_curacc_msq(isp, may);
3198 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3205 * Returns 0 if current has read and write access, error code otherwise
3207 static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg,
3208 struct task_struct *target, long type, int mode)
3210 return smk_curacc_msq(isp, MAY_READWRITE);
3214 * smack_ipc_permission - Smack access for ipc_permission()
3215 * @ipp: the object permissions
3216 * @flag: access requested
3218 * Returns 0 if current has read and write access, error code otherwise
3220 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3222 struct smack_known **blob = smack_ipc(ipp);
3223 struct smack_known *iskp = *blob;
3224 int may = smack_flags_to_may(flag);
3225 struct smk_audit_info ad;
3229 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3230 ad.a.u.ipc_id = ipp->id;
3232 rc = smk_curacc(iskp, may, &ad);
3233 rc = smk_bu_current("svipc", iskp, may, rc);
3238 * smack_ipc_getsecid - Extract smack security id
3239 * @ipp: the object permissions
3240 * @secid: where result will be saved
3242 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3244 struct smack_known **blob = smack_ipc(ipp);
3245 struct smack_known *iskp = *blob;
3247 *secid = iskp->smk_secid;
3251 * smack_d_instantiate - Make sure the blob is correct on an inode
3252 * @opt_dentry: dentry where inode will be attached
3253 * @inode: the object
3255 * Set the inode's security blob if it hasn't been done already.
3257 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3259 struct super_block *sbp;
3260 struct superblock_smack *sbsp;
3261 struct inode_smack *isp;
3262 struct smack_known *skp;
3263 struct smack_known *ckp = smk_of_current();
3264 struct smack_known *final;
3265 char trattr[TRANS_TRUE_SIZE];
3273 isp = smack_inode(inode);
3275 mutex_lock(&isp->smk_lock);
3277 * If the inode is already instantiated
3278 * take the quick way out
3280 if (isp->smk_flags & SMK_INODE_INSTANT)
3284 sbsp = sbp->s_security;
3286 * We're going to use the superblock default label
3287 * if there's no label on the file.
3289 final = sbsp->smk_default;
3292 * If this is the root inode the superblock
3293 * may be in the process of initialization.
3294 * If that is the case use the root value out
3295 * of the superblock.
3297 if (opt_dentry->d_parent == opt_dentry) {
3298 switch (sbp->s_magic) {
3299 case CGROUP_SUPER_MAGIC:
3300 case CGROUP2_SUPER_MAGIC:
3302 * The cgroup filesystem is never mounted,
3303 * so there's no opportunity to set the mount
3306 sbsp->smk_root = &smack_known_star;
3307 sbsp->smk_default = &smack_known_star;
3308 isp->smk_inode = sbsp->smk_root;
3312 * What about shmem/tmpfs anonymous files with dentry
3313 * obtained from d_alloc_pseudo()?
3315 isp->smk_inode = smk_of_current();
3318 isp->smk_inode = smk_of_current();
3322 * Socket access is controlled by the socket
3323 * structures associated with the task involved.
3325 isp->smk_inode = &smack_known_star;
3328 isp->smk_inode = sbsp->smk_root;
3331 isp->smk_flags |= SMK_INODE_INSTANT;
3336 * This is pretty hackish.
3337 * Casey says that we shouldn't have to do
3338 * file system specific code, but it does help
3339 * with keeping it simple.
3341 switch (sbp->s_magic) {
3343 case CGROUP_SUPER_MAGIC:
3344 case CGROUP2_SUPER_MAGIC:
3346 * Casey says that it's a little embarrassing
3347 * that the smack file system doesn't do
3348 * extended attributes.
3350 * Cgroupfs is special
3352 final = &smack_known_star;
3354 case DEVPTS_SUPER_MAGIC:
3356 * devpts seems content with the label of the task.
3357 * Programs that change smack have to treat the
3362 case PROC_SUPER_MAGIC:
3364 * Casey says procfs appears not to care.
3365 * The superblock default suffices.
3370 * Device labels should come from the filesystem,
3371 * but watch out, because they're volitile,
3372 * getting recreated on every reboot.
3374 final = &smack_known_star;
3376 * If a smack value has been set we want to use it,
3377 * but since tmpfs isn't giving us the opportunity
3378 * to set mount options simulate setting the
3379 * superblock default.
3384 * This isn't an understood special case.
3385 * Get the value from the xattr.
3389 * UNIX domain sockets use lower level socket data.
3391 if (S_ISSOCK(inode->i_mode)) {
3392 final = &smack_known_star;
3396 * No xattr support means, alas, no SMACK label.
3397 * Use the aforeapplied default.
3398 * It would be curious if the label of the task
3399 * does not match that assigned.
3401 if (!(inode->i_opflags & IOP_XATTR))
3404 * Get the dentry for xattr.
3406 dp = dget(opt_dentry);
3407 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3408 if (!IS_ERR_OR_NULL(skp))
3412 * Transmuting directory
3414 if (S_ISDIR(inode->i_mode)) {
3416 * If this is a new directory and the label was
3417 * transmuted when the inode was initialized
3418 * set the transmute attribute on the directory
3419 * and mark the inode.
3421 * If there is a transmute attribute on the
3422 * directory mark the inode.
3424 if (isp->smk_flags & SMK_INODE_CHANGED) {
3425 isp->smk_flags &= ~SMK_INODE_CHANGED;
3426 rc = __vfs_setxattr(dp, inode,
3427 XATTR_NAME_SMACKTRANSMUTE,
3428 TRANS_TRUE, TRANS_TRUE_SIZE,
3431 rc = __vfs_getxattr(dp, inode,
3432 XATTR_NAME_SMACKTRANSMUTE, trattr,
3434 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3435 TRANS_TRUE_SIZE) != 0)
3439 transflag = SMK_INODE_TRANSMUTE;
3442 * Don't let the exec or mmap label be "*" or "@".
3444 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3445 if (IS_ERR(skp) || skp == &smack_known_star ||
3446 skp == &smack_known_web)
3448 isp->smk_task = skp;
3450 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3451 if (IS_ERR(skp) || skp == &smack_known_star ||
3452 skp == &smack_known_web)
3454 isp->smk_mmap = skp;
3461 isp->smk_inode = ckp;
3463 isp->smk_inode = final;
3465 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3468 mutex_unlock(&isp->smk_lock);
3473 * smack_getprocattr - Smack process attribute access
3474 * @p: the object task
3475 * @name: the name of the attribute in /proc/.../attr
3476 * @value: where to put the result
3478 * Places a copy of the task Smack into value
3480 * Returns the length of the smack label or an error code
3482 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
3484 struct smack_known *skp = smk_of_task_struct(p);
3488 if (strcmp(name, "current") != 0)
3491 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3501 * smack_setprocattr - Smack process attribute setting
3502 * @name: the name of the attribute in /proc/.../attr
3503 * @value: the value to set
3504 * @size: the size of the value
3506 * Sets the Smack value of the task. Only setting self
3507 * is permitted and only with privilege
3509 * Returns the length of the smack label or an error code
3511 static int smack_setprocattr(const char *name, void *value, size_t size)
3513 struct task_smack *tsp = smack_cred(current_cred());
3515 struct smack_known *skp;
3516 struct smack_known_list_elem *sklep;
3519 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3522 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3525 if (strcmp(name, "current") != 0)
3528 skp = smk_import_entry(value, size);
3530 return PTR_ERR(skp);
3533 * No process is ever allowed the web ("@") label
3534 * and the star ("*") label.
3536 if (skp == &smack_known_web || skp == &smack_known_star)
3539 if (!smack_privileged(CAP_MAC_ADMIN)) {
3541 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3542 if (sklep->smk_label == skp) {
3550 new = prepare_creds();
3554 tsp = smack_cred(new);
3555 tsp->smk_task = skp;
3557 * process can change its label only once
3559 smk_destroy_label_list(&tsp->smk_relabel);
3566 * smack_unix_stream_connect - Smack access on UDS
3568 * @other: the other sock
3571 * Return 0 if a subject with the smack of sock could access
3572 * an object with the smack of other, otherwise an error code
3574 static int smack_unix_stream_connect(struct sock *sock,
3575 struct sock *other, struct sock *newsk)
3577 struct smack_known *skp;
3578 struct smack_known *okp;
3579 struct socket_smack *ssp = sock->sk_security;
3580 struct socket_smack *osp = other->sk_security;
3581 struct socket_smack *nsp = newsk->sk_security;
3582 struct smk_audit_info ad;
3585 struct lsm_network_audit net;
3588 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3592 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3593 smk_ad_setfield_u_net_sk(&ad, other);
3595 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3596 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3600 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3601 rc = smk_bu_note("UDS connect", okp, skp,
3607 * Cross reference the peer labels for SO_PEERSEC.
3610 nsp->smk_packet = ssp->smk_out;
3611 ssp->smk_packet = osp->smk_out;
3618 * smack_unix_may_send - Smack access on UDS
3620 * @other: the other socket
3622 * Return 0 if a subject with the smack of sock could access
3623 * an object with the smack of other, otherwise an error code
3625 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3627 struct socket_smack *ssp = sock->sk->sk_security;
3628 struct socket_smack *osp = other->sk->sk_security;
3629 struct smk_audit_info ad;
3633 struct lsm_network_audit net;
3635 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3636 smk_ad_setfield_u_net_sk(&ad, other->sk);
3639 if (smack_privileged(CAP_MAC_OVERRIDE))
3642 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3643 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3648 * smack_socket_sendmsg - Smack check based on destination host
3651 * @size: the size of the message
3653 * Return 0 if the current subject can write to the destination host.
3654 * For IPv4 this is only a question if the destination is a single label host.
3655 * For IPv6 this is a check against the label of the port.
3657 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3660 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3661 #if IS_ENABLED(CONFIG_IPV6)
3662 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3664 #ifdef SMACK_IPV6_SECMARK_LABELING
3665 struct socket_smack *ssp = sock->sk->sk_security;
3666 struct smack_known *rsp;
3671 * Perfectly reasonable for this to be NULL
3676 switch (sock->sk->sk_family) {
3678 if (msg->msg_namelen < sizeof(struct sockaddr_in) ||
3679 sip->sin_family != AF_INET)
3681 rc = smack_netlabel_send(sock->sk, sip);
3683 #if IS_ENABLED(CONFIG_IPV6)
3685 if (msg->msg_namelen < SIN6_LEN_RFC2133 ||
3686 sap->sin6_family != AF_INET6)
3688 #ifdef SMACK_IPV6_SECMARK_LABELING
3689 rsp = smack_ipv6host_label(sap);
3691 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3694 #ifdef SMACK_IPV6_PORT_LABELING
3695 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3697 #endif /* IS_ENABLED(CONFIG_IPV6) */
3704 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3705 * @sap: netlabel secattr
3706 * @ssp: socket security information
3708 * Returns a pointer to a Smack label entry found on the label list.
3710 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3711 struct socket_smack *ssp)
3713 struct smack_known *skp;
3718 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3720 * Looks like a CIPSO packet.
3721 * If there are flags but no level netlabel isn't
3722 * behaving the way we expect it to.
3724 * Look it up in the label table
3725 * Without guidance regarding the smack value
3726 * for the packet fall back on the network
3730 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3731 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3734 * Compare the catsets. Use the netlbl APIs.
3736 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3737 if ((skp->smk_netlabel.flags &
3738 NETLBL_SECATTR_MLS_CAT) == 0)
3742 for (acat = -1, kcat = -1; acat == kcat; ) {
3743 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3745 kcat = netlbl_catmap_walk(
3746 skp->smk_netlabel.attr.mls.cat,
3748 if (acat < 0 || kcat < 0)
3761 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3762 return &smack_known_web;
3763 return &smack_known_star;
3765 if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3767 * Looks like a fallback, which gives us a secid.
3769 return smack_from_secid(sap->attr.secid);
3771 * Without guidance regarding the smack value
3772 * for the packet fall back on the network
3775 return smack_net_ambient;
3778 #if IS_ENABLED(CONFIG_IPV6)
3779 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3783 int proto = -EINVAL;
3784 struct ipv6hdr _ipv6h;
3785 struct ipv6hdr *ip6;
3787 struct tcphdr _tcph, *th;
3788 struct udphdr _udph, *uh;
3789 struct dccp_hdr _dccph, *dh;
3793 offset = skb_network_offset(skb);
3794 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3797 sip->sin6_addr = ip6->saddr;
3799 nexthdr = ip6->nexthdr;
3800 offset += sizeof(_ipv6h);
3801 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3808 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3810 sip->sin6_port = th->source;
3813 case IPPROTO_UDPLITE:
3814 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3816 sip->sin6_port = uh->source;
3819 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3821 sip->sin6_port = dh->dccph_sport;
3826 #endif /* CONFIG_IPV6 */
3829 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3833 * Returns 0 if the packet should be delivered, an error code otherwise
3835 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3837 struct netlbl_lsm_secattr secattr;
3838 struct socket_smack *ssp = sk->sk_security;
3839 struct smack_known *skp = NULL;
3841 struct smk_audit_info ad;
3842 u16 family = sk->sk_family;
3844 struct lsm_network_audit net;
3846 #if IS_ENABLED(CONFIG_IPV6)
3847 struct sockaddr_in6 sadd;
3850 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3852 #endif /* CONFIG_IPV6 */
3856 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3858 * If there is a secmark use it rather than the CIPSO label.
3859 * If there is no secmark fall back to CIPSO.
3860 * The secmark is assumed to reflect policy better.
3862 if (skb && skb->secmark != 0) {
3863 skp = smack_from_secid(skb->secmark);
3866 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3868 * Translate what netlabel gave us.
3870 netlbl_secattr_init(&secattr);
3872 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3874 skp = smack_from_secattr(&secattr, ssp);
3876 skp = smack_net_ambient;
3878 netlbl_secattr_destroy(&secattr);
3880 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3884 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3885 ad.a.u.net->family = family;
3886 ad.a.u.net->netif = skb->skb_iif;
3887 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3890 * Receiving a packet requires that the other end
3891 * be able to write here. Read access is not required.
3892 * This is the simplist possible security model
3895 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3896 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
3899 netlbl_skbuff_err(skb, family, rc, 0);
3901 #if IS_ENABLED(CONFIG_IPV6)
3903 proto = smk_skb_to_addr_ipv6(skb, &sadd);
3904 if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE &&
3905 proto != IPPROTO_TCP && proto != IPPROTO_DCCP)
3907 #ifdef SMACK_IPV6_SECMARK_LABELING
3908 if (skb && skb->secmark != 0)
3909 skp = smack_from_secid(skb->secmark);
3910 else if (smk_ipv6_localhost(&sadd))
3913 skp = smack_ipv6host_label(&sadd);
3915 skp = smack_net_ambient;
3919 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3920 ad.a.u.net->family = family;
3921 ad.a.u.net->netif = skb->skb_iif;
3922 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
3923 #endif /* CONFIG_AUDIT */
3924 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3925 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
3927 #endif /* SMACK_IPV6_SECMARK_LABELING */
3928 #ifdef SMACK_IPV6_PORT_LABELING
3929 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3930 #endif /* SMACK_IPV6_PORT_LABELING */
3932 icmpv6_send(skb, ICMPV6_DEST_UNREACH,
3933 ICMPV6_ADM_PROHIBITED, 0);
3935 #endif /* CONFIG_IPV6 */
3942 * smack_socket_getpeersec_stream - pull in packet label
3944 * @optval: user's destination
3945 * @optlen: size thereof
3948 * returns zero on success, an error code otherwise
3950 static int smack_socket_getpeersec_stream(struct socket *sock,
3951 char __user *optval,
3952 int __user *optlen, unsigned len)
3954 struct socket_smack *ssp;
3959 ssp = sock->sk->sk_security;
3960 if (ssp->smk_packet != NULL) {
3961 rcp = ssp->smk_packet->smk_known;
3962 slen = strlen(rcp) + 1;
3967 else if (copy_to_user(optval, rcp, slen) != 0)
3970 if (put_user(slen, optlen) != 0)
3978 * smack_socket_getpeersec_dgram - pull in packet label
3979 * @sock: the peer socket
3981 * @secid: pointer to where to put the secid of the packet
3983 * Sets the netlabel socket state on sk from parent
3985 static int smack_socket_getpeersec_dgram(struct socket *sock,
3986 struct sk_buff *skb, u32 *secid)
3989 struct netlbl_lsm_secattr secattr;
3990 struct socket_smack *ssp = NULL;
3991 struct smack_known *skp;
3992 int family = PF_UNSPEC;
3993 u32 s = 0; /* 0 is the invalid secid */
3997 if (skb->protocol == htons(ETH_P_IP))
3999 #if IS_ENABLED(CONFIG_IPV6)
4000 else if (skb->protocol == htons(ETH_P_IPV6))
4002 #endif /* CONFIG_IPV6 */
4004 if (family == PF_UNSPEC && sock != NULL)
4005 family = sock->sk->sk_family;
4009 ssp = sock->sk->sk_security;
4010 s = ssp->smk_out->smk_secid;
4013 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4019 * Translate what netlabel gave us.
4021 if (sock != NULL && sock->sk != NULL)
4022 ssp = sock->sk->sk_security;
4023 netlbl_secattr_init(&secattr);
4024 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4026 skp = smack_from_secattr(&secattr, ssp);
4029 netlbl_secattr_destroy(&secattr);
4032 #ifdef SMACK_IPV6_SECMARK_LABELING
4044 * smack_sock_graft - Initialize a newly created socket with an existing sock
4046 * @parent: parent socket
4048 * Set the smk_{in,out} state of an existing sock based on the process that
4049 * is creating the new socket.
4051 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4053 struct socket_smack *ssp;
4054 struct smack_known *skp = smk_of_current();
4057 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4060 ssp = sk->sk_security;
4063 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4067 * smack_inet_conn_request - Smack access check on connect
4068 * @sk: socket involved
4072 * Returns 0 if a task with the packet label could write to
4073 * the socket, otherwise an error code
4075 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4076 struct request_sock *req)
4078 u16 family = sk->sk_family;
4079 struct smack_known *skp;
4080 struct socket_smack *ssp = sk->sk_security;
4081 struct netlbl_lsm_secattr secattr;
4082 struct sockaddr_in addr;
4084 struct smack_known *hskp;
4086 struct smk_audit_info ad;
4088 struct lsm_network_audit net;
4091 #if IS_ENABLED(CONFIG_IPV6)
4092 if (family == PF_INET6) {
4094 * Handle mapped IPv4 packets arriving
4095 * via IPv6 sockets. Don't set up netlabel
4096 * processing on IPv6.
4098 if (skb->protocol == htons(ETH_P_IP))
4103 #endif /* CONFIG_IPV6 */
4105 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4107 * If there is a secmark use it rather than the CIPSO label.
4108 * If there is no secmark fall back to CIPSO.
4109 * The secmark is assumed to reflect policy better.
4111 if (skb && skb->secmark != 0) {
4112 skp = smack_from_secid(skb->secmark);
4115 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4117 netlbl_secattr_init(&secattr);
4118 rc = netlbl_skbuff_getattr(skb, family, &secattr);
4120 skp = smack_from_secattr(&secattr, ssp);
4122 skp = &smack_known_huh;
4123 netlbl_secattr_destroy(&secattr);
4125 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4130 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4131 ad.a.u.net->family = family;
4132 ad.a.u.net->netif = skb->skb_iif;
4133 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4136 * Receiving a packet requires that the other end be able to write
4137 * here. Read access is not required.
4139 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4140 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4145 * Save the peer's label in the request_sock so we can later setup
4146 * smk_packet in the child socket so that SO_PEERCRED can report it.
4148 req->peer_secid = skp->smk_secid;
4151 * We need to decide if we want to label the incoming connection here
4152 * if we do we only need to label the request_sock and the stack will
4153 * propagate the wire-label to the sock when it is created.
4156 addr.sin_addr.s_addr = hdr->saddr;
4158 hskp = smack_ipv4host_label(&addr);
4162 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4164 netlbl_req_delattr(req);
4170 * smack_inet_csk_clone - Copy the connection information to the new socket
4171 * @sk: the new socket
4172 * @req: the connection's request_sock
4174 * Transfer the connection's peer label to the newly created socket.
4176 static void smack_inet_csk_clone(struct sock *sk,
4177 const struct request_sock *req)
4179 struct socket_smack *ssp = sk->sk_security;
4180 struct smack_known *skp;
4182 if (req->peer_secid != 0) {
4183 skp = smack_from_secid(req->peer_secid);
4184 ssp->smk_packet = skp;
4186 ssp->smk_packet = NULL;
4190 * Key management security hooks
4192 * Casey has not tested key support very heavily.
4193 * The permission check is most likely too restrictive.
4194 * If you care about keys please have a look.
4199 * smack_key_alloc - Set the key security blob
4201 * @cred: the credentials to use
4204 * No allocation required
4208 static int smack_key_alloc(struct key *key, const struct cred *cred,
4209 unsigned long flags)
4211 struct smack_known *skp = smk_of_task(smack_cred(cred));
4213 key->security = skp;
4218 * smack_key_free - Clear the key security blob
4221 * Clear the blob pointer
4223 static void smack_key_free(struct key *key)
4225 key->security = NULL;
4229 * smack_key_permission - Smack access on a key
4230 * @key_ref: gets to the object
4231 * @cred: the credentials to use
4232 * @perm: requested key permissions
4234 * Return 0 if the task has read and write to the object,
4235 * an error code otherwise
4237 static int smack_key_permission(key_ref_t key_ref,
4238 const struct cred *cred, unsigned perm)
4241 struct smk_audit_info ad;
4242 struct smack_known *tkp = smk_of_task(smack_cred(cred));
4247 * Validate requested permissions
4249 if (perm & ~KEY_NEED_ALL)
4252 keyp = key_ref_to_ptr(key_ref);
4256 * If the key hasn't been initialized give it access so that
4259 if (keyp->security == NULL)
4262 * This should not occur
4267 if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred))
4271 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4272 ad.a.u.key_struct.key = keyp->serial;
4273 ad.a.u.key_struct.key_desc = keyp->description;
4275 if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW))
4276 request |= MAY_READ;
4277 if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
4278 request |= MAY_WRITE;
4279 rc = smk_access(tkp, keyp->security, request, &ad);
4280 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4285 * smack_key_getsecurity - Smack label tagging the key
4286 * @key points to the key to be queried
4287 * @_buffer points to a pointer that should be set to point to the
4288 * resulting string (if no label or an error occurs).
4289 * Return the length of the string (including terminating NUL) or -ve if
4291 * May also return 0 (and a NULL buffer pointer) if there is no label.
4293 static int smack_key_getsecurity(struct key *key, char **_buffer)
4295 struct smack_known *skp = key->security;
4299 if (key->security == NULL) {
4304 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4307 length = strlen(copy) + 1;
4313 #endif /* CONFIG_KEYS */
4318 * Audit requires a unique representation of each Smack specific
4319 * rule. This unique representation is used to distinguish the
4320 * object to be audited from remaining kernel objects and also
4321 * works as a glue between the audit hooks.
4323 * Since repository entries are added but never deleted, we'll use
4324 * the smack_known label address related to the given audit rule as
4325 * the needed unique representation. This also better fits the smack
4326 * model where nearly everything is a label.
4331 * smack_audit_rule_init - Initialize a smack audit rule
4332 * @field: audit rule fields given from user-space (audit.h)
4333 * @op: required testing operator (=, !=, >, <, ...)
4334 * @rulestr: smack label to be audited
4335 * @vrule: pointer to save our own audit rule representation
4337 * Prepare to audit cases where (@field @op @rulestr) is true.
4338 * The label to be audited is created if necessay.
4340 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4342 struct smack_known *skp;
4343 char **rule = (char **)vrule;
4346 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4349 if (op != Audit_equal && op != Audit_not_equal)
4352 skp = smk_import_entry(rulestr, 0);
4354 return PTR_ERR(skp);
4356 *rule = skp->smk_known;
4362 * smack_audit_rule_known - Distinguish Smack audit rules
4363 * @krule: rule of interest, in Audit kernel representation format
4365 * This is used to filter Smack rules from remaining Audit ones.
4366 * If it's proved that this rule belongs to us, the
4367 * audit_rule_match hook will be called to do the final judgement.
4369 static int smack_audit_rule_known(struct audit_krule *krule)
4371 struct audit_field *f;
4374 for (i = 0; i < krule->field_count; i++) {
4375 f = &krule->fields[i];
4377 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4385 * smack_audit_rule_match - Audit given object ?
4386 * @secid: security id for identifying the object to test
4387 * @field: audit rule flags given from user-space
4388 * @op: required testing operator
4389 * @vrule: smack internal rule presentation
4391 * The core Audit hook. It's used to take the decision of
4392 * whether to audit or not to audit a given object.
4394 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule)
4396 struct smack_known *skp;
4399 if (unlikely(!rule)) {
4400 WARN_ONCE(1, "Smack: missing rule\n");
4404 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4407 skp = smack_from_secid(secid);
4410 * No need to do string comparisons. If a match occurs,
4411 * both pointers will point to the same smack_known
4414 if (op == Audit_equal)
4415 return (rule == skp->smk_known);
4416 if (op == Audit_not_equal)
4417 return (rule != skp->smk_known);
4423 * There is no need for a smack_audit_rule_free hook.
4424 * No memory was allocated.
4427 #endif /* CONFIG_AUDIT */
4430 * smack_ismaclabel - check if xattr @name references a smack MAC label
4431 * @name: Full xattr name to check.
4433 static int smack_ismaclabel(const char *name)
4435 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4440 * smack_secid_to_secctx - return the smack label for a secid
4441 * @secid: incoming integer
4442 * @secdata: destination
4443 * @seclen: how long it is
4445 * Exists for networking code.
4447 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4449 struct smack_known *skp = smack_from_secid(secid);
4452 *secdata = skp->smk_known;
4453 *seclen = strlen(skp->smk_known);
4458 * smack_secctx_to_secid - return the secid for a smack label
4459 * @secdata: smack label
4460 * @seclen: how long result is
4461 * @secid: outgoing integer
4463 * Exists for audit and networking code.
4465 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4467 struct smack_known *skp = smk_find_entry(secdata);
4470 *secid = skp->smk_secid;
4477 * There used to be a smack_release_secctx hook
4478 * that did nothing back when hooks were in a vector.
4479 * Now that there's a list such a hook adds cost.
4482 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4484 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
4487 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4489 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
4492 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4494 struct smack_known *skp = smk_of_inode(inode);
4496 *ctx = skp->smk_known;
4497 *ctxlen = strlen(skp->smk_known);
4501 static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
4504 struct task_smack *tsp;
4505 struct smack_known *skp;
4506 struct inode_smack *isp;
4507 struct cred *new_creds = *new;
4509 if (new_creds == NULL) {
4510 new_creds = prepare_creds();
4511 if (new_creds == NULL)
4515 tsp = smack_cred(new_creds);
4518 * Get label from overlay inode and set it in create_sid
4520 isp = smack_inode(d_inode(dentry->d_parent));
4521 skp = isp->smk_inode;
4522 tsp->smk_task = skp;
4527 static int smack_inode_copy_up_xattr(const char *name)
4530 * Return 1 if this is the smack access Smack attribute.
4532 if (strcmp(name, XATTR_NAME_SMACK) == 0)
4538 static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
4540 const struct cred *old,
4543 struct task_smack *otsp = smack_cred(old);
4544 struct task_smack *ntsp = smack_cred(new);
4545 struct inode_smack *isp;
4549 * Use the process credential unless all of
4550 * the transmuting criteria are met
4552 ntsp->smk_task = otsp->smk_task;
4555 * the attribute of the containing directory
4557 isp = smack_inode(d_inode(dentry->d_parent));
4559 if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
4561 may = smk_access_entry(otsp->smk_task->smk_known,
4562 isp->smk_inode->smk_known,
4563 &otsp->smk_task->smk_rules);
4567 * If the directory is transmuting and the rule
4568 * providing access is transmuting use the containing
4569 * directory label instead of the process label.
4571 if (may > 0 && (may & MAY_TRANSMUTE))
4572 ntsp->smk_task = isp->smk_inode;
4577 struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
4578 .lbs_cred = sizeof(struct task_smack),
4579 .lbs_file = sizeof(struct smack_known *),
4580 .lbs_inode = sizeof(struct inode_smack),
4581 .lbs_ipc = sizeof(struct smack_known *),
4582 .lbs_msg_msg = sizeof(struct smack_known *),
4585 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
4586 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4587 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4588 LSM_HOOK_INIT(syslog, smack_syslog),
4590 LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup),
4591 LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param),
4593 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4594 LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
4595 LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts),
4596 LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts),
4597 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4598 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4600 LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
4602 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4603 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4604 LSM_HOOK_INIT(inode_link, smack_inode_link),
4605 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4606 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4607 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4608 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4609 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4610 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4611 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4612 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4613 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4614 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4615 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4616 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4617 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4618 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4620 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4621 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4622 LSM_HOOK_INIT(file_lock, smack_file_lock),
4623 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4624 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4625 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4626 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4627 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4628 LSM_HOOK_INIT(file_receive, smack_file_receive),
4630 LSM_HOOK_INIT(file_open, smack_file_open),
4632 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4633 LSM_HOOK_INIT(cred_free, smack_cred_free),
4634 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4635 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4636 LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid),
4637 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4638 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4639 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4640 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4641 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4642 LSM_HOOK_INIT(task_getsecid, smack_task_getsecid),
4643 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4644 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4645 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4646 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4647 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4648 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4649 LSM_HOOK_INIT(task_kill, smack_task_kill),
4650 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4652 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4653 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4655 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4657 LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security),
4658 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4659 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4660 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4661 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4663 LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security),
4664 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4665 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4666 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4668 LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security),
4669 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4670 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4671 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4673 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4675 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4676 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4678 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4679 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4681 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4682 LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair),
4683 #ifdef SMACK_IPV6_PORT_LABELING
4684 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4686 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4687 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4688 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4689 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4690 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4691 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4692 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4693 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4694 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4695 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4697 /* key management security hooks */
4699 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4700 LSM_HOOK_INIT(key_free, smack_key_free),
4701 LSM_HOOK_INIT(key_permission, smack_key_permission),
4702 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4703 #endif /* CONFIG_KEYS */
4707 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4708 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4709 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4710 #endif /* CONFIG_AUDIT */
4712 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4713 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4714 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
4715 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
4716 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
4717 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
4718 LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up),
4719 LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr),
4720 LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as),
4724 static __init void init_smack_known_list(void)
4727 * Initialize rule list locks
4729 mutex_init(&smack_known_huh.smk_rules_lock);
4730 mutex_init(&smack_known_hat.smk_rules_lock);
4731 mutex_init(&smack_known_floor.smk_rules_lock);
4732 mutex_init(&smack_known_star.smk_rules_lock);
4733 mutex_init(&smack_known_web.smk_rules_lock);
4735 * Initialize rule lists
4737 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
4738 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
4739 INIT_LIST_HEAD(&smack_known_star.smk_rules);
4740 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
4741 INIT_LIST_HEAD(&smack_known_web.smk_rules);
4743 * Create the known labels list
4745 smk_insert_entry(&smack_known_huh);
4746 smk_insert_entry(&smack_known_hat);
4747 smk_insert_entry(&smack_known_star);
4748 smk_insert_entry(&smack_known_floor);
4749 smk_insert_entry(&smack_known_web);
4753 * smack_init - initialize the smack system
4755 * Returns 0 on success, -ENOMEM is there's no memory
4757 static __init int smack_init(void)
4759 struct cred *cred = (struct cred *) current->cred;
4760 struct task_smack *tsp;
4762 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
4763 if (!smack_inode_cache)
4766 smack_rule_cache = KMEM_CACHE(smack_rule, 0);
4767 if (!smack_rule_cache) {
4768 kmem_cache_destroy(smack_inode_cache);
4773 * Set the security state for the initial task.
4775 tsp = smack_cred(cred);
4776 init_task_smack(tsp, &smack_known_floor, &smack_known_floor);
4781 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
4784 pr_info("Smack: Initializing.\n");
4785 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4786 pr_info("Smack: Netfilter enabled.\n");
4788 #ifdef SMACK_IPV6_PORT_LABELING
4789 pr_info("Smack: IPv6 port labeling enabled.\n");
4791 #ifdef SMACK_IPV6_SECMARK_LABELING
4792 pr_info("Smack: IPv6 Netfilter enabled.\n");
4795 /* initialize the smack_known_list */
4796 init_smack_known_list();
4802 * Smack requires early initialization in order to label
4803 * all processes and objects when they are created.
4805 DEFINE_LSM(smack) = {
4807 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
4808 .blobs = &smack_blob_sizes,