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 <net/cipso_ipv4.h>
34 #include <linux/audit.h>
35 #include <linux/magic.h>
36 #include <linux/dcache.h>
37 #include <linux/personality.h>
38 #include <linux/msg.h>
39 #include <linux/shm.h>
40 #include <linux/binfmts.h>
41 #include <linux/parser.h>
42 #include <linux/fs_context.h>
43 #include <linux/fs_parser.h>
44 #include <linux/watch_queue.h>
45 #include <linux/io_uring.h>
48 #define TRANS_TRUE "TRUE"
49 #define TRANS_TRUE_SIZE 4
51 #define SMK_CONNECTING 0
52 #define SMK_RECEIVING 1
55 #ifdef SMACK_IPV6_PORT_LABELING
56 static DEFINE_MUTEX(smack_ipv6_lock);
57 static LIST_HEAD(smk_ipv6_port_list);
59 struct kmem_cache *smack_rule_cache;
60 int smack_enabled __initdata;
62 #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
67 } smk_mount_opts[] = {
68 {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault},
69 A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute)
73 static int match_opt_prefix(char *s, int l, char **arg)
77 for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {
78 size_t len = smk_mount_opts[i].len;
79 if (len > l || memcmp(s, smk_mount_opts[i].name, len))
81 if (len == l || s[len] != '=')
84 return smk_mount_opts[i].opt;
89 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
90 static char *smk_bu_mess[] = {
91 "Bringup Error", /* Unused */
92 "Bringup", /* SMACK_BRINGUP_ALLOW */
93 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
94 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
97 static void smk_bu_mode(int mode, char *s)
103 if (mode & MAY_WRITE)
107 if (mode & MAY_APPEND)
109 if (mode & MAY_TRANSMUTE)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_note(char *note, struct smack_known *sskp,
121 struct smack_known *oskp, int mode, int rc)
123 char acc[SMK_NUM_ACCESS_TYPE + 1];
127 if (rc > SMACK_UNCONFINED_OBJECT)
130 smk_bu_mode(mode, acc);
131 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
132 sskp->smk_known, oskp->smk_known, acc, note);
136 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
139 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
140 static int smk_bu_current(char *note, struct smack_known *oskp,
143 struct task_smack *tsp = smack_cred(current_cred());
144 char acc[SMK_NUM_ACCESS_TYPE + 1];
148 if (rc > SMACK_UNCONFINED_OBJECT)
151 smk_bu_mode(mode, acc);
152 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
153 tsp->smk_task->smk_known, oskp->smk_known,
154 acc, current->comm, note);
158 #define smk_bu_current(note, oskp, mode, RC) (RC)
161 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
162 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
164 struct task_smack *tsp = smack_cred(current_cred());
165 struct smack_known *smk_task = smk_of_task_struct_obj(otp);
166 char acc[SMK_NUM_ACCESS_TYPE + 1];
170 if (rc > SMACK_UNCONFINED_OBJECT)
173 smk_bu_mode(mode, acc);
174 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc],
175 tsp->smk_task->smk_known, smk_task->smk_known, acc,
176 current->comm, otp->comm);
180 #define smk_bu_task(otp, mode, RC) (RC)
183 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
184 static int smk_bu_inode(struct inode *inode, int mode, int rc)
186 struct task_smack *tsp = smack_cred(current_cred());
187 struct inode_smack *isp = smack_inode(inode);
188 char acc[SMK_NUM_ACCESS_TYPE + 1];
190 if (isp->smk_flags & SMK_INODE_IMPURE)
191 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
192 inode->i_sb->s_id, inode->i_ino, current->comm);
196 if (rc > SMACK_UNCONFINED_OBJECT)
198 if (rc == SMACK_UNCONFINED_SUBJECT &&
199 (mode & (MAY_WRITE | MAY_APPEND)))
200 isp->smk_flags |= SMK_INODE_IMPURE;
202 smk_bu_mode(mode, acc);
204 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
205 tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
206 inode->i_sb->s_id, inode->i_ino, current->comm);
210 #define smk_bu_inode(inode, mode, RC) (RC)
213 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
214 static int smk_bu_file(struct file *file, int mode, int rc)
216 struct task_smack *tsp = smack_cred(current_cred());
217 struct smack_known *sskp = tsp->smk_task;
218 struct inode *inode = file_inode(file);
219 struct inode_smack *isp = smack_inode(inode);
220 char acc[SMK_NUM_ACCESS_TYPE + 1];
222 if (isp->smk_flags & SMK_INODE_IMPURE)
223 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
224 inode->i_sb->s_id, inode->i_ino, current->comm);
228 if (rc > SMACK_UNCONFINED_OBJECT)
231 smk_bu_mode(mode, acc);
232 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
233 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
234 inode->i_sb->s_id, inode->i_ino, file,
239 #define smk_bu_file(file, mode, RC) (RC)
242 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
243 static int smk_bu_credfile(const struct cred *cred, struct file *file,
246 struct task_smack *tsp = smack_cred(cred);
247 struct smack_known *sskp = tsp->smk_task;
248 struct inode *inode = file_inode(file);
249 struct inode_smack *isp = smack_inode(inode);
250 char acc[SMK_NUM_ACCESS_TYPE + 1];
252 if (isp->smk_flags & SMK_INODE_IMPURE)
253 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
254 inode->i_sb->s_id, inode->i_ino, current->comm);
258 if (rc > SMACK_UNCONFINED_OBJECT)
261 smk_bu_mode(mode, acc);
262 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
263 sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
264 inode->i_sb->s_id, inode->i_ino, file,
269 #define smk_bu_credfile(cred, file, mode, RC) (RC)
273 * smk_fetch - Fetch the smack label from a file.
274 * @name: type of the label (attribute)
275 * @ip: a pointer to the inode
276 * @dp: a pointer to the dentry
278 * Returns a pointer to the master list entry for the Smack label,
279 * NULL if there was no label to fetch, or an error code.
281 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
286 struct smack_known *skp = NULL;
288 if (!(ip->i_opflags & IOP_XATTR))
289 return ERR_PTR(-EOPNOTSUPP);
291 buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS);
293 return ERR_PTR(-ENOMEM);
295 rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
301 skp = smk_import_entry(buffer, rc);
309 * init_inode_smack - initialize an inode security blob
310 * @inode: inode to extract the info from
311 * @skp: a pointer to the Smack label entry to use in the blob
314 static void init_inode_smack(struct inode *inode, struct smack_known *skp)
316 struct inode_smack *isp = smack_inode(inode);
318 isp->smk_inode = skp;
323 * init_task_smack - initialize a task security blob
324 * @tsp: blob to initialize
325 * @task: a pointer to the Smack label for the running task
326 * @forked: a pointer to the Smack label for the forked task
329 static void init_task_smack(struct task_smack *tsp, struct smack_known *task,
330 struct smack_known *forked)
332 tsp->smk_task = task;
333 tsp->smk_forked = forked;
334 INIT_LIST_HEAD(&tsp->smk_rules);
335 INIT_LIST_HEAD(&tsp->smk_relabel);
336 mutex_init(&tsp->smk_rules_lock);
340 * smk_copy_rules - copy a rule set
341 * @nhead: new rules header pointer
342 * @ohead: old rules header pointer
343 * @gfp: type of the memory for the allocation
345 * Returns 0 on success, -ENOMEM on error
347 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
350 struct smack_rule *nrp;
351 struct smack_rule *orp;
354 list_for_each_entry_rcu(orp, ohead, list) {
355 nrp = kmem_cache_zalloc(smack_rule_cache, gfp);
361 list_add_rcu(&nrp->list, nhead);
367 * smk_copy_relabel - copy smk_relabel labels list
368 * @nhead: new rules header pointer
369 * @ohead: old rules header pointer
370 * @gfp: type of the memory for the allocation
372 * Returns 0 on success, -ENOMEM on error
374 static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
377 struct smack_known_list_elem *nklep;
378 struct smack_known_list_elem *oklep;
380 list_for_each_entry(oklep, ohead, list) {
381 nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
383 smk_destroy_label_list(nhead);
386 nklep->smk_label = oklep->smk_label;
387 list_add(&nklep->list, nhead);
394 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
395 * @mode: input mode in form of PTRACE_MODE_*
397 * Returns a converted MAY_* mode usable by smack rules
399 static inline unsigned int smk_ptrace_mode(unsigned int mode)
401 if (mode & PTRACE_MODE_ATTACH)
402 return MAY_READWRITE;
403 if (mode & PTRACE_MODE_READ)
410 * smk_ptrace_rule_check - helper for ptrace access
411 * @tracer: tracer process
412 * @tracee_known: label entry of the process that's about to be traced
413 * @mode: ptrace attachment mode (PTRACE_MODE_*)
414 * @func: name of the function that called us, used for audit
416 * Returns 0 on access granted, -error on error
418 static int smk_ptrace_rule_check(struct task_struct *tracer,
419 struct smack_known *tracee_known,
420 unsigned int mode, const char *func)
423 struct smk_audit_info ad, *saip = NULL;
424 struct task_smack *tsp;
425 struct smack_known *tracer_known;
426 const struct cred *tracercred;
428 if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
429 smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
430 smk_ad_setfield_u_tsk(&ad, tracer);
435 tracercred = __task_cred(tracer);
436 tsp = smack_cred(tracercred);
437 tracer_known = smk_of_task(tsp);
439 if ((mode & PTRACE_MODE_ATTACH) &&
440 (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
441 smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
442 if (tracer_known->smk_known == tracee_known->smk_known)
444 else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
446 else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred))
452 smack_log(tracer_known->smk_known,
453 tracee_known->smk_known,
460 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
461 rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
469 * We he, that is fun!
473 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
474 * @ctp: child task pointer
475 * @mode: ptrace attachment mode (PTRACE_MODE_*)
477 * Returns 0 if access is OK, an error code otherwise
479 * Do the capability checks.
481 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
483 struct smack_known *skp;
485 skp = smk_of_task_struct_obj(ctp);
487 return smk_ptrace_rule_check(current, skp, mode, __func__);
491 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
492 * @ptp: parent task pointer
494 * Returns 0 if access is OK, an error code otherwise
496 * Do the capability checks, and require PTRACE_MODE_ATTACH.
498 static int smack_ptrace_traceme(struct task_struct *ptp)
500 struct smack_known *skp;
502 skp = smk_of_task(smack_cred(current_cred()));
504 return smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
508 * smack_syslog - Smack approval on syslog
509 * @typefrom_file: unused
511 * Returns 0 on success, error code otherwise.
513 static int smack_syslog(int typefrom_file)
516 struct smack_known *skp = smk_of_current();
518 if (smack_privileged(CAP_MAC_OVERRIDE))
521 if (smack_syslog_label != NULL && smack_syslog_label != skp)
532 * smack_sb_alloc_security - allocate a superblock blob
533 * @sb: the superblock getting the blob
535 * Returns 0 on success or -ENOMEM on error.
537 static int smack_sb_alloc_security(struct super_block *sb)
539 struct superblock_smack *sbsp = smack_superblock(sb);
541 sbsp->smk_root = &smack_known_floor;
542 sbsp->smk_default = &smack_known_floor;
543 sbsp->smk_floor = &smack_known_floor;
544 sbsp->smk_hat = &smack_known_hat;
546 * SMK_SB_INITIALIZED will be zero from kzalloc.
552 struct smack_mnt_opts {
553 const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute;
556 static void smack_free_mnt_opts(void *mnt_opts)
558 struct smack_mnt_opts *opts = mnt_opts;
559 kfree(opts->fsdefault);
560 kfree(opts->fsfloor);
563 kfree(opts->fstransmute);
567 static int smack_add_opt(int token, const char *s, void **mnt_opts)
569 struct smack_mnt_opts *opts = *mnt_opts;
572 opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
601 case Opt_fstransmute:
602 if (opts->fstransmute)
604 opts->fstransmute = s;
610 pr_warn("Smack: duplicate mount options\n");
615 * smack_fs_context_dup - Duplicate the security data on fs_context duplication
616 * @fc: The new filesystem context.
617 * @src_fc: The source filesystem context being duplicated.
619 * Returns 0 on success or -ENOMEM on error.
621 static int smack_fs_context_dup(struct fs_context *fc,
622 struct fs_context *src_fc)
624 struct smack_mnt_opts *dst, *src = src_fc->security;
629 fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
634 if (src->fsdefault) {
635 dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL);
640 dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL);
645 dst->fshat = kstrdup(src->fshat, GFP_KERNEL);
650 dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL);
654 if (src->fstransmute) {
655 dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL);
656 if (!dst->fstransmute)
662 static const struct fs_parameter_spec smack_fs_parameters[] = {
663 fsparam_string("smackfsdef", Opt_fsdefault),
664 fsparam_string("smackfsdefault", Opt_fsdefault),
665 fsparam_string("smackfsfloor", Opt_fsfloor),
666 fsparam_string("smackfshat", Opt_fshat),
667 fsparam_string("smackfsroot", Opt_fsroot),
668 fsparam_string("smackfstransmute", Opt_fstransmute),
673 * smack_fs_context_parse_param - Parse a single mount parameter
674 * @fc: The new filesystem context being constructed.
675 * @param: The parameter.
677 * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on
680 static int smack_fs_context_parse_param(struct fs_context *fc,
681 struct fs_parameter *param)
683 struct fs_parse_result result;
686 opt = fs_parse(fc, smack_fs_parameters, param, &result);
690 rc = smack_add_opt(opt, param->string, &fc->security);
692 param->string = NULL;
696 static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
698 char *from = options, *to = options;
702 char *next = strchr(from, ',');
711 token = match_opt_prefix(from, len, &arg);
712 if (token != Opt_error) {
713 arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);
714 rc = smack_add_opt(token, arg, mnt_opts);
718 smack_free_mnt_opts(*mnt_opts);
723 if (!first) { // copy with preceding comma
728 memmove(to, from, len);
741 * smack_set_mnt_opts - set Smack specific mount options
742 * @sb: the file system superblock
743 * @mnt_opts: Smack mount options
744 * @kern_flags: mount option from kernel space or user space
745 * @set_kern_flags: where to store converted mount opts
747 * Returns 0 on success, an error code on failure
749 * Allow filesystems with binary mount data to explicitly set Smack mount
752 static int smack_set_mnt_opts(struct super_block *sb,
754 unsigned long kern_flags,
755 unsigned long *set_kern_flags)
757 struct dentry *root = sb->s_root;
758 struct inode *inode = d_backing_inode(root);
759 struct superblock_smack *sp = smack_superblock(sb);
760 struct inode_smack *isp;
761 struct smack_known *skp;
762 struct smack_mnt_opts *opts = mnt_opts;
763 bool transmute = false;
765 if (sp->smk_flags & SMK_SB_INITIALIZED)
768 if (!smack_privileged(CAP_MAC_ADMIN)) {
770 * Unprivileged mounts don't get to specify Smack values.
775 * Unprivileged mounts get root and default from the caller.
777 skp = smk_of_current();
779 sp->smk_default = skp;
781 * For a handful of fs types with no user-controlled
782 * backing store it's okay to trust security labels
783 * in the filesystem. The rest are untrusted.
785 if (sb->s_user_ns != &init_user_ns &&
786 sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC &&
787 sb->s_magic != RAMFS_MAGIC) {
789 sp->smk_flags |= SMK_SB_UNTRUSTED;
793 sp->smk_flags |= SMK_SB_INITIALIZED;
796 if (opts->fsdefault) {
797 skp = smk_import_entry(opts->fsdefault, 0);
800 sp->smk_default = skp;
803 skp = smk_import_entry(opts->fsfloor, 0);
809 skp = smk_import_entry(opts->fshat, 0);
815 skp = smk_import_entry(opts->fsroot, 0);
820 if (opts->fstransmute) {
821 skp = smk_import_entry(opts->fstransmute, 0);
830 * Initialize the root inode.
832 init_inode_smack(inode, sp->smk_root);
835 isp = smack_inode(inode);
836 isp->smk_flags |= SMK_INODE_TRANSMUTE;
843 * smack_sb_statfs - Smack check on statfs
844 * @dentry: identifies the file system in question
846 * Returns 0 if current can read the floor of the filesystem,
847 * and error code otherwise
849 static int smack_sb_statfs(struct dentry *dentry)
851 struct superblock_smack *sbp = smack_superblock(dentry->d_sb);
853 struct smk_audit_info ad;
855 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
856 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
858 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
859 rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc);
868 * smack_bprm_creds_for_exec - Update bprm->cred if needed for exec
869 * @bprm: the exec information
871 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
873 static int smack_bprm_creds_for_exec(struct linux_binprm *bprm)
875 struct inode *inode = file_inode(bprm->file);
876 struct task_smack *bsp = smack_cred(bprm->cred);
877 struct inode_smack *isp;
878 struct superblock_smack *sbsp;
881 isp = smack_inode(inode);
882 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
885 sbsp = smack_superblock(inode->i_sb);
886 if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
887 isp->smk_task != sbsp->smk_root)
890 if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
891 struct task_struct *tracer;
895 tracer = ptrace_parent(current);
896 if (likely(tracer != NULL))
897 rc = smk_ptrace_rule_check(tracer,
906 if (bprm->unsafe & ~LSM_UNSAFE_PTRACE)
909 bsp->smk_task = isp->smk_task;
910 bprm->per_clear |= PER_CLEAR_ON_SETID;
912 /* Decide if this is a secure exec. */
913 if (bsp->smk_task != bsp->smk_forked)
914 bprm->secureexec = 1;
924 * smack_inode_alloc_security - allocate an inode blob
925 * @inode: the inode in need of a blob
929 static int smack_inode_alloc_security(struct inode *inode)
931 struct smack_known *skp = smk_of_current();
933 init_inode_smack(inode, skp);
938 * smack_inode_init_security - copy out the smack from an inode
939 * @inode: the newly created inode
940 * @dir: containing directory object
942 * @name: where to put the attribute name
943 * @value: where to put the attribute value
944 * @len: where to put the length of the attribute
946 * Returns 0 if it all works out, -ENOMEM if there's no memory
948 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
949 const struct qstr *qstr, const char **name,
950 void **value, size_t *len)
952 struct inode_smack *issp = smack_inode(inode);
953 struct smack_known *skp = smk_of_current();
954 struct smack_known *isp = smk_of_inode(inode);
955 struct smack_known *dsp = smk_of_inode(dir);
959 *name = XATTR_SMACK_SUFFIX;
963 may = smk_access_entry(skp->smk_known, dsp->smk_known,
968 * If the access rule allows transmutation and
969 * the directory requests transmutation then
970 * by all means transmute.
971 * Mark the inode as changed.
973 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
974 smk_inode_transmutable(dir)) {
976 issp->smk_flags |= SMK_INODE_CHANGED;
979 *value = kstrdup(isp->smk_known, GFP_NOFS);
983 *len = strlen(isp->smk_known);
990 * smack_inode_link - Smack check on link
991 * @old_dentry: the existing object
993 * @new_dentry: the new object
995 * Returns 0 if access is permitted, an error code otherwise
997 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
998 struct dentry *new_dentry)
1000 struct smack_known *isp;
1001 struct smk_audit_info ad;
1004 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1005 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1007 isp = smk_of_inode(d_backing_inode(old_dentry));
1008 rc = smk_curacc(isp, MAY_WRITE, &ad);
1009 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);
1011 if (rc == 0 && d_is_positive(new_dentry)) {
1012 isp = smk_of_inode(d_backing_inode(new_dentry));
1013 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1014 rc = smk_curacc(isp, MAY_WRITE, &ad);
1015 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
1022 * smack_inode_unlink - Smack check on inode deletion
1023 * @dir: containing directory object
1024 * @dentry: file to unlink
1026 * Returns 0 if current can write the containing directory
1027 * and the object, error code otherwise
1029 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
1031 struct inode *ip = d_backing_inode(dentry);
1032 struct smk_audit_info ad;
1035 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1036 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1039 * You need write access to the thing you're unlinking
1041 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
1042 rc = smk_bu_inode(ip, MAY_WRITE, rc);
1045 * You also need write access to the containing directory
1047 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1048 smk_ad_setfield_u_fs_inode(&ad, dir);
1049 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1050 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1056 * smack_inode_rmdir - Smack check on directory deletion
1057 * @dir: containing directory object
1058 * @dentry: directory to unlink
1060 * Returns 0 if current can write the containing directory
1061 * and the directory, error code otherwise
1063 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
1065 struct smk_audit_info ad;
1068 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1069 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1072 * You need write access to the thing you're removing
1074 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1075 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1078 * You also need write access to the containing directory
1080 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1081 smk_ad_setfield_u_fs_inode(&ad, dir);
1082 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
1083 rc = smk_bu_inode(dir, MAY_WRITE, rc);
1090 * smack_inode_rename - Smack check on rename
1091 * @old_inode: unused
1092 * @old_dentry: the old object
1093 * @new_inode: unused
1094 * @new_dentry: the new object
1096 * Read and write access is required on both the old and
1099 * Returns 0 if access is permitted, an error code otherwise
1101 static int smack_inode_rename(struct inode *old_inode,
1102 struct dentry *old_dentry,
1103 struct inode *new_inode,
1104 struct dentry *new_dentry)
1107 struct smack_known *isp;
1108 struct smk_audit_info ad;
1110 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1111 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
1113 isp = smk_of_inode(d_backing_inode(old_dentry));
1114 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1115 rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);
1117 if (rc == 0 && d_is_positive(new_dentry)) {
1118 isp = smk_of_inode(d_backing_inode(new_dentry));
1119 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
1120 rc = smk_curacc(isp, MAY_READWRITE, &ad);
1121 rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
1127 * smack_inode_permission - Smack version of permission()
1128 * @inode: the inode in question
1129 * @mask: the access requested
1131 * This is the important Smack hook.
1133 * Returns 0 if access is permitted, an error code otherwise
1135 static int smack_inode_permission(struct inode *inode, int mask)
1137 struct superblock_smack *sbsp = smack_superblock(inode->i_sb);
1138 struct smk_audit_info ad;
1139 int no_block = mask & MAY_NOT_BLOCK;
1142 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
1144 * No permission to check. Existence test. Yup, it's there.
1149 if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
1150 if (smk_of_inode(inode) != sbsp->smk_root)
1154 /* May be droppable after audit */
1157 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
1158 smk_ad_setfield_u_fs_inode(&ad, inode);
1159 rc = smk_curacc(smk_of_inode(inode), mask, &ad);
1160 rc = smk_bu_inode(inode, mask, rc);
1165 * smack_inode_setattr - Smack check for setting attributes
1166 * @dentry: the object
1167 * @iattr: for the force flag
1169 * Returns 0 if access is permitted, an error code otherwise
1171 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
1173 struct smk_audit_info ad;
1177 * Need to allow for clearing the setuid bit.
1179 if (iattr->ia_valid & ATTR_FORCE)
1181 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1182 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1184 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1185 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1190 * smack_inode_getattr - Smack check for getting attributes
1191 * @path: path to extract the info from
1193 * Returns 0 if access is permitted, an error code otherwise
1195 static int smack_inode_getattr(const struct path *path)
1197 struct smk_audit_info ad;
1198 struct inode *inode = d_backing_inode(path->dentry);
1201 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1202 smk_ad_setfield_u_fs_path(&ad, *path);
1203 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1204 rc = smk_bu_inode(inode, MAY_READ, rc);
1209 * smack_inode_setxattr - Smack check for setting xattrs
1210 * @idmap: idmap of the mount
1211 * @dentry: the object
1212 * @name: name of the attribute
1213 * @value: value of the attribute
1214 * @size: size of the value
1217 * This protects the Smack attribute explicitly.
1219 * Returns 0 if access is permitted, an error code otherwise
1221 static int smack_inode_setxattr(struct mnt_idmap *idmap,
1222 struct dentry *dentry, const char *name,
1223 const void *value, size_t size, int flags)
1225 struct smk_audit_info ad;
1226 struct smack_known *skp;
1228 int check_import = 0;
1233 * Check label validity here so import won't fail in post_setxattr
1235 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1236 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1237 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
1240 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1241 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1245 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1247 if (size != TRANS_TRUE_SIZE ||
1248 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
1251 rc = cap_inode_setxattr(dentry, name, value, size, flags);
1253 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
1256 if (rc == 0 && check_import) {
1257 skp = size ? smk_import_entry(value, size) : NULL;
1260 else if (skp == NULL || (check_star &&
1261 (skp == &smack_known_star || skp == &smack_known_web)))
1265 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1266 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1269 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1270 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1277 * smack_inode_post_setxattr - Apply the Smack update approved above
1279 * @name: attribute name
1280 * @value: attribute value
1281 * @size: attribute size
1284 * Set the pointer in the inode blob to the entry found
1285 * in the master label list.
1287 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
1288 const void *value, size_t size, int flags)
1290 struct smack_known *skp;
1291 struct inode_smack *isp = smack_inode(d_backing_inode(dentry));
1293 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
1294 isp->smk_flags |= SMK_INODE_TRANSMUTE;
1298 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1299 skp = smk_import_entry(value, size);
1301 isp->smk_inode = skp;
1302 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
1303 skp = smk_import_entry(value, size);
1305 isp->smk_task = skp;
1306 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1307 skp = smk_import_entry(value, size);
1309 isp->smk_mmap = skp;
1316 * smack_inode_getxattr - Smack check on getxattr
1317 * @dentry: the object
1320 * Returns 0 if access is permitted, an error code otherwise
1322 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
1324 struct smk_audit_info ad;
1327 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1328 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1330 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1331 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1336 * smack_inode_removexattr - Smack check on removexattr
1337 * @idmap: idmap of the mount
1338 * @dentry: the object
1339 * @name: name of the attribute
1341 * Removing the Smack attribute requires CAP_MAC_ADMIN
1343 * Returns 0 if access is permitted, an error code otherwise
1345 static int smack_inode_removexattr(struct mnt_idmap *idmap,
1346 struct dentry *dentry, const char *name)
1348 struct inode_smack *isp;
1349 struct smk_audit_info ad;
1352 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
1353 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
1354 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
1355 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
1356 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
1357 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
1358 if (!smack_privileged(CAP_MAC_ADMIN))
1361 rc = cap_inode_removexattr(idmap, dentry, name);
1366 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1367 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1369 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1370 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1374 isp = smack_inode(d_backing_inode(dentry));
1376 * Don't do anything special for these.
1377 * XATTR_NAME_SMACKIPIN
1378 * XATTR_NAME_SMACKIPOUT
1380 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
1381 struct super_block *sbp = dentry->d_sb;
1382 struct superblock_smack *sbsp = smack_superblock(sbp);
1384 isp->smk_inode = sbsp->smk_default;
1385 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0)
1386 isp->smk_task = NULL;
1387 else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0)
1388 isp->smk_mmap = NULL;
1389 else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
1390 isp->smk_flags &= ~SMK_INODE_TRANSMUTE;
1396 * smack_inode_set_acl - Smack check for setting posix acls
1397 * @idmap: idmap of the mnt this request came from
1398 * @dentry: the object
1399 * @acl_name: name of the posix acl
1400 * @kacl: the posix acls
1402 * Returns 0 if access is permitted, an error code otherwise
1404 static int smack_inode_set_acl(struct mnt_idmap *idmap,
1405 struct dentry *dentry, const char *acl_name,
1406 struct posix_acl *kacl)
1408 struct smk_audit_info ad;
1411 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1412 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1414 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1415 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1420 * smack_inode_get_acl - Smack check for getting posix acls
1421 * @idmap: idmap of the mnt this request came from
1422 * @dentry: the object
1423 * @acl_name: name of the posix acl
1425 * Returns 0 if access is permitted, an error code otherwise
1427 static int smack_inode_get_acl(struct mnt_idmap *idmap,
1428 struct dentry *dentry, const char *acl_name)
1430 struct smk_audit_info ad;
1433 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1434 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1436 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
1437 rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
1442 * smack_inode_remove_acl - Smack check for getting posix acls
1443 * @idmap: idmap of the mnt this request came from
1444 * @dentry: the object
1445 * @acl_name: name of the posix acl
1447 * Returns 0 if access is permitted, an error code otherwise
1449 static int smack_inode_remove_acl(struct mnt_idmap *idmap,
1450 struct dentry *dentry, const char *acl_name)
1452 struct smk_audit_info ad;
1455 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
1456 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
1458 rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad);
1459 rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc);
1464 * smack_inode_getsecurity - get smack xattrs
1465 * @idmap: idmap of the mount
1466 * @inode: the object
1467 * @name: attribute name
1468 * @buffer: where to put the result
1469 * @alloc: duplicate memory
1471 * Returns the size of the attribute or an error code
1473 static int smack_inode_getsecurity(struct mnt_idmap *idmap,
1474 struct inode *inode, const char *name,
1475 void **buffer, bool alloc)
1477 struct socket_smack *ssp;
1478 struct socket *sock;
1479 struct super_block *sbp;
1480 struct inode *ip = (struct inode *)inode;
1481 struct smack_known *isp;
1483 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
1484 isp = smk_of_inode(inode);
1487 * The rest of the Smack xattrs are only on sockets.
1490 if (sbp->s_magic != SOCKFS_MAGIC)
1493 sock = SOCKET_I(ip);
1494 if (sock == NULL || sock->sk == NULL)
1497 ssp = sock->sk->sk_security;
1499 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1501 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1508 *buffer = kstrdup(isp->smk_known, GFP_KERNEL);
1509 if (*buffer == NULL)
1513 return strlen(isp->smk_known);
1518 * smack_inode_listsecurity - list the Smack attributes
1519 * @inode: the object
1520 * @buffer: where they go
1521 * @buffer_size: size of buffer
1523 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1526 int len = sizeof(XATTR_NAME_SMACK);
1528 if (buffer != NULL && len <= buffer_size)
1529 memcpy(buffer, XATTR_NAME_SMACK, len);
1535 * smack_inode_getsecid - Extract inode's security id
1536 * @inode: inode to extract the info from
1537 * @secid: where result will be saved
1539 static void smack_inode_getsecid(struct inode *inode, u32 *secid)
1541 struct smack_known *skp = smk_of_inode(inode);
1543 *secid = skp->smk_secid;
1551 * There is no smack_file_permission hook
1553 * Should access checks be done on each read or write?
1554 * UNICOS and SELinux say yes.
1555 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1557 * I'll say no for now. Smack does not do the frequent
1558 * label changing that SELinux does.
1562 * smack_file_alloc_security - assign a file security blob
1565 * The security blob for a file is a pointer to the master
1566 * label list, so no allocation is done.
1568 * f_security is the owner security information. It
1569 * isn't used on file access checks, it's for send_sigio.
1573 static int smack_file_alloc_security(struct file *file)
1575 struct smack_known **blob = smack_file(file);
1577 *blob = smk_of_current();
1582 * smack_file_ioctl - Smack check on ioctls
1587 * Relies heavily on the correct use of the ioctl command conventions.
1589 * Returns 0 if allowed, error code otherwise
1591 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1595 struct smk_audit_info ad;
1596 struct inode *inode = file_inode(file);
1598 if (unlikely(IS_PRIVATE(inode)))
1601 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1602 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1604 if (_IOC_DIR(cmd) & _IOC_WRITE) {
1605 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1606 rc = smk_bu_file(file, MAY_WRITE, rc);
1609 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
1610 rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
1611 rc = smk_bu_file(file, MAY_READ, rc);
1618 * smack_file_lock - Smack check on file locking
1622 * Returns 0 if current has lock access, error code otherwise
1624 static int smack_file_lock(struct file *file, unsigned int cmd)
1626 struct smk_audit_info ad;
1628 struct inode *inode = file_inode(file);
1630 if (unlikely(IS_PRIVATE(inode)))
1633 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1634 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1635 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1636 rc = smk_bu_file(file, MAY_LOCK, rc);
1641 * smack_file_fcntl - Smack check on fcntl
1643 * @cmd: what action to check
1646 * Generally these operations are harmless.
1647 * File locking operations present an obvious mechanism
1648 * for passing information, so they require write access.
1650 * Returns 0 if current has access, error code otherwise
1652 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1655 struct smk_audit_info ad;
1657 struct inode *inode = file_inode(file);
1659 if (unlikely(IS_PRIVATE(inode)))
1667 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1668 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1669 rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
1670 rc = smk_bu_file(file, MAY_LOCK, rc);
1674 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1675 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1676 rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
1677 rc = smk_bu_file(file, MAY_WRITE, rc);
1687 * smack_mmap_file - Check permissions for a mmap operation.
1688 * @file: contains the file structure for file to map (may be NULL).
1689 * @reqprot: contains the protection requested by the application.
1690 * @prot: contains the protection that will be applied by the kernel.
1691 * @flags: contains the operational flags.
1693 * The @file may be NULL, e.g. if mapping anonymous memory.
1695 * Return 0 if permission is granted.
1697 static int smack_mmap_file(struct file *file,
1698 unsigned long reqprot, unsigned long prot,
1699 unsigned long flags)
1701 struct smack_known *skp;
1702 struct smack_known *mkp;
1703 struct smack_rule *srp;
1704 struct task_smack *tsp;
1705 struct smack_known *okp;
1706 struct inode_smack *isp;
1707 struct superblock_smack *sbsp;
1716 if (unlikely(IS_PRIVATE(file_inode(file))))
1719 isp = smack_inode(file_inode(file));
1720 if (isp->smk_mmap == NULL)
1722 sbsp = smack_superblock(file_inode(file)->i_sb);
1723 if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
1724 isp->smk_mmap != sbsp->smk_root)
1726 mkp = isp->smk_mmap;
1728 tsp = smack_cred(current_cred());
1729 skp = smk_of_current();
1734 * For each Smack rule associated with the subject
1735 * label verify that the SMACK64MMAP also has access
1736 * to that rule's object label.
1738 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1739 okp = srp->smk_object;
1741 * Matching labels always allows access.
1743 if (mkp->smk_known == okp->smk_known)
1746 * If there is a matching local rule take
1747 * that into account as well.
1749 may = smk_access_entry(srp->smk_subject->smk_known,
1753 may = srp->smk_access;
1755 may &= srp->smk_access;
1757 * If may is zero the SMACK64MMAP subject can't
1758 * possibly have less access.
1764 * Fetch the global list entry.
1765 * If there isn't one a SMACK64MMAP subject
1766 * can't have as much access as current.
1768 mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1770 if (mmay == -ENOENT) {
1775 * If there is a local entry it modifies the
1776 * potential access, too.
1778 tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
1780 if (tmay != -ENOENT)
1784 * If there is any access available to current that is
1785 * not available to a SMACK64MMAP subject
1788 if ((may | mmay) != mmay) {
1800 * smack_file_set_fowner - set the file security blob value
1801 * @file: object in question
1804 static void smack_file_set_fowner(struct file *file)
1806 struct smack_known **blob = smack_file(file);
1808 *blob = smk_of_current();
1812 * smack_file_send_sigiotask - Smack on sigio
1813 * @tsk: The target task
1814 * @fown: the object the signal come from
1817 * Allow a privileged task to get signals even if it shouldn't
1819 * Returns 0 if a subject with the object's smack could
1820 * write to the task, an error code otherwise.
1822 static int smack_file_send_sigiotask(struct task_struct *tsk,
1823 struct fown_struct *fown, int signum)
1825 struct smack_known **blob;
1826 struct smack_known *skp;
1827 struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
1828 const struct cred *tcred;
1831 struct smk_audit_info ad;
1834 * struct fown_struct is never outside the context of a struct file
1836 file = container_of(fown, struct file, f_owner);
1838 /* we don't log here as rc can be overriden */
1839 blob = smack_file(file);
1841 rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
1842 rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
1845 tcred = __task_cred(tsk);
1846 if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred))
1850 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1851 smk_ad_setfield_u_tsk(&ad, tsk);
1852 smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
1857 * smack_file_receive - Smack file receive check
1860 * Returns 0 if current has access, error code otherwise
1862 static int smack_file_receive(struct file *file)
1866 struct smk_audit_info ad;
1867 struct inode *inode = file_inode(file);
1868 struct socket *sock;
1869 struct task_smack *tsp;
1870 struct socket_smack *ssp;
1872 if (unlikely(IS_PRIVATE(inode)))
1875 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1876 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1878 if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
1879 sock = SOCKET_I(inode);
1880 ssp = sock->sk->sk_security;
1881 tsp = smack_cred(current_cred());
1883 * If the receiving process can't write to the
1884 * passed socket or if the passed socket can't
1885 * write to the receiving process don't accept
1886 * the passed socket.
1888 rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
1889 rc = smk_bu_file(file, may, rc);
1892 rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
1893 rc = smk_bu_file(file, may, rc);
1897 * This code relies on bitmasks.
1899 if (file->f_mode & FMODE_READ)
1901 if (file->f_mode & FMODE_WRITE)
1904 rc = smk_curacc(smk_of_inode(inode), may, &ad);
1905 rc = smk_bu_file(file, may, rc);
1910 * smack_file_open - Smack dentry open processing
1913 * Set the security blob in the file structure.
1914 * Allow the open only if the task has read access. There are
1915 * many read operations (e.g. fstat) that you can do with an
1916 * fd even if you have the file open write-only.
1918 * Returns 0 if current has access, error code otherwise
1920 static int smack_file_open(struct file *file)
1922 struct task_smack *tsp = smack_cred(file->f_cred);
1923 struct inode *inode = file_inode(file);
1924 struct smk_audit_info ad;
1927 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1928 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1929 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
1930 rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc);
1940 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1941 * @cred: the new credentials
1942 * @gfp: the atomicity of any memory allocations
1944 * Prepare a blank set of credentials for modification. This must allocate all
1945 * the memory the LSM module might require such that cred_transfer() can
1946 * complete without error.
1948 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1950 init_task_smack(smack_cred(cred), NULL, NULL);
1956 * smack_cred_free - "free" task-level security credentials
1957 * @cred: the credentials in question
1960 static void smack_cred_free(struct cred *cred)
1962 struct task_smack *tsp = smack_cred(cred);
1963 struct smack_rule *rp;
1964 struct list_head *l;
1965 struct list_head *n;
1967 smk_destroy_label_list(&tsp->smk_relabel);
1969 list_for_each_safe(l, n, &tsp->smk_rules) {
1970 rp = list_entry(l, struct smack_rule, list);
1971 list_del(&rp->list);
1972 kmem_cache_free(smack_rule_cache, rp);
1977 * smack_cred_prepare - prepare new set of credentials for modification
1978 * @new: the new credentials
1979 * @old: the original credentials
1980 * @gfp: the atomicity of any memory allocations
1982 * Prepare a new set of credentials for modification.
1984 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1987 struct task_smack *old_tsp = smack_cred(old);
1988 struct task_smack *new_tsp = smack_cred(new);
1991 init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task);
1993 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1997 rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
2003 * smack_cred_transfer - Transfer the old credentials to the new credentials
2004 * @new: the new credentials
2005 * @old: the original credentials
2007 * Fill in a set of blank credentials from another set of credentials.
2009 static void smack_cred_transfer(struct cred *new, const struct cred *old)
2011 struct task_smack *old_tsp = smack_cred(old);
2012 struct task_smack *new_tsp = smack_cred(new);
2014 new_tsp->smk_task = old_tsp->smk_task;
2015 new_tsp->smk_forked = old_tsp->smk_task;
2016 mutex_init(&new_tsp->smk_rules_lock);
2017 INIT_LIST_HEAD(&new_tsp->smk_rules);
2019 /* cbs copy rule list */
2023 * smack_cred_getsecid - get the secid corresponding to a creds structure
2024 * @cred: the object creds
2025 * @secid: where to put the result
2027 * Sets the secid to contain a u32 version of the smack label.
2029 static void smack_cred_getsecid(const struct cred *cred, u32 *secid)
2031 struct smack_known *skp;
2034 skp = smk_of_task(smack_cred(cred));
2035 *secid = skp->smk_secid;
2040 * smack_kernel_act_as - Set the subjective context in a set of credentials
2041 * @new: points to the set of credentials to be modified.
2042 * @secid: specifies the security ID to be set
2044 * Set the security data for a kernel service.
2046 static int smack_kernel_act_as(struct cred *new, u32 secid)
2048 struct task_smack *new_tsp = smack_cred(new);
2050 new_tsp->smk_task = smack_from_secid(secid);
2055 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2056 * @new: points to the set of credentials to be modified
2057 * @inode: points to the inode to use as a reference
2059 * Set the file creation context in a set of credentials to the same
2060 * as the objective context of the specified inode
2062 static int smack_kernel_create_files_as(struct cred *new,
2063 struct inode *inode)
2065 struct inode_smack *isp = smack_inode(inode);
2066 struct task_smack *tsp = smack_cred(new);
2068 tsp->smk_forked = isp->smk_inode;
2069 tsp->smk_task = tsp->smk_forked;
2074 * smk_curacc_on_task - helper to log task related access
2075 * @p: the task object
2076 * @access: the access requested
2077 * @caller: name of the calling function for audit
2079 * Return 0 if access is permitted
2081 static int smk_curacc_on_task(struct task_struct *p, int access,
2084 struct smk_audit_info ad;
2085 struct smack_known *skp = smk_of_task_struct_obj(p);
2088 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
2089 smk_ad_setfield_u_tsk(&ad, p);
2090 rc = smk_curacc(skp, access, &ad);
2091 rc = smk_bu_task(p, access, rc);
2096 * smack_task_setpgid - Smack check on setting pgid
2097 * @p: the task object
2100 * Return 0 if write access is permitted
2102 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
2104 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2108 * smack_task_getpgid - Smack access check for getpgid
2109 * @p: the object task
2111 * Returns 0 if current can read the object task, error code otherwise
2113 static int smack_task_getpgid(struct task_struct *p)
2115 return smk_curacc_on_task(p, MAY_READ, __func__);
2119 * smack_task_getsid - Smack access check for getsid
2120 * @p: the object task
2122 * Returns 0 if current can read the object task, error code otherwise
2124 static int smack_task_getsid(struct task_struct *p)
2126 return smk_curacc_on_task(p, MAY_READ, __func__);
2130 * smack_current_getsecid_subj - get the subjective secid of the current task
2131 * @secid: where to put the result
2133 * Sets the secid to contain a u32 version of the task's subjective smack label.
2135 static void smack_current_getsecid_subj(u32 *secid)
2137 struct smack_known *skp = smk_of_current();
2139 *secid = skp->smk_secid;
2143 * smack_task_getsecid_obj - get the objective secid of the task
2145 * @secid: where to put the result
2147 * Sets the secid to contain a u32 version of the task's objective smack label.
2149 static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid)
2151 struct smack_known *skp = smk_of_task_struct_obj(p);
2153 *secid = skp->smk_secid;
2157 * smack_task_setnice - Smack check on setting nice
2158 * @p: the task object
2161 * Return 0 if write access is permitted
2163 static int smack_task_setnice(struct task_struct *p, int nice)
2165 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2169 * smack_task_setioprio - Smack check on setting ioprio
2170 * @p: the task object
2173 * Return 0 if write access is permitted
2175 static int smack_task_setioprio(struct task_struct *p, int ioprio)
2177 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2181 * smack_task_getioprio - Smack check on reading ioprio
2182 * @p: the task object
2184 * Return 0 if read access is permitted
2186 static int smack_task_getioprio(struct task_struct *p)
2188 return smk_curacc_on_task(p, MAY_READ, __func__);
2192 * smack_task_setscheduler - Smack check on setting scheduler
2193 * @p: the task object
2195 * Return 0 if read access is permitted
2197 static int smack_task_setscheduler(struct task_struct *p)
2199 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2203 * smack_task_getscheduler - Smack check on reading scheduler
2204 * @p: the task object
2206 * Return 0 if read access is permitted
2208 static int smack_task_getscheduler(struct task_struct *p)
2210 return smk_curacc_on_task(p, MAY_READ, __func__);
2214 * smack_task_movememory - Smack check on moving memory
2215 * @p: the task object
2217 * Return 0 if write access is permitted
2219 static int smack_task_movememory(struct task_struct *p)
2221 return smk_curacc_on_task(p, MAY_WRITE, __func__);
2225 * smack_task_kill - Smack check on signal delivery
2226 * @p: the task object
2229 * @cred: identifies the cred to use in lieu of current's
2231 * Return 0 if write access is permitted
2234 static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
2235 int sig, const struct cred *cred)
2237 struct smk_audit_info ad;
2238 struct smack_known *skp;
2239 struct smack_known *tkp = smk_of_task_struct_obj(p);
2243 return 0; /* null signal; existence test */
2245 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
2246 smk_ad_setfield_u_tsk(&ad, p);
2248 * Sending a signal requires that the sender
2249 * can write the receiver.
2252 rc = smk_curacc(tkp, MAY_DELIVER, &ad);
2253 rc = smk_bu_task(p, MAY_DELIVER, rc);
2257 * If the cred isn't NULL we're dealing with some USB IO
2258 * specific behavior. This is not clean. For one thing
2259 * we can't take privilege into account.
2261 skp = smk_of_task(smack_cred(cred));
2262 rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
2263 rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
2268 * smack_task_to_inode - copy task smack into the inode blob
2269 * @p: task to copy from
2270 * @inode: inode to copy to
2272 * Sets the smack pointer in the inode security blob
2274 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
2276 struct inode_smack *isp = smack_inode(inode);
2277 struct smack_known *skp = smk_of_task_struct_obj(p);
2279 isp->smk_inode = skp;
2280 isp->smk_flags |= SMK_INODE_INSTANT;
2288 * smack_sk_alloc_security - Allocate a socket blob
2291 * @gfp_flags: memory allocation flags
2293 * Assign Smack pointers to current
2295 * Returns 0 on success, -ENOMEM is there's no memory
2297 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
2299 struct smack_known *skp = smk_of_current();
2300 struct socket_smack *ssp;
2302 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
2307 * Sockets created by kernel threads receive web label.
2309 if (unlikely(current->flags & PF_KTHREAD)) {
2310 ssp->smk_in = &smack_known_web;
2311 ssp->smk_out = &smack_known_web;
2316 ssp->smk_packet = NULL;
2318 sk->sk_security = ssp;
2324 * smack_sk_free_security - Free a socket blob
2327 * Clears the blob pointer
2329 static void smack_sk_free_security(struct sock *sk)
2331 #ifdef SMACK_IPV6_PORT_LABELING
2332 struct smk_port_label *spp;
2334 if (sk->sk_family == PF_INET6) {
2336 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2337 if (spp->smk_sock != sk)
2339 spp->smk_can_reuse = 1;
2345 kfree(sk->sk_security);
2349 * smack_sk_clone_security - Copy security context
2350 * @sk: the old socket
2351 * @newsk: the new socket
2353 * Copy the security context of the old socket pointer to the cloned
2355 static void smack_sk_clone_security(const struct sock *sk, struct sock *newsk)
2357 struct socket_smack *ssp_old = sk->sk_security;
2358 struct socket_smack *ssp_new = newsk->sk_security;
2360 *ssp_new = *ssp_old;
2364 * smack_ipv4host_label - check host based restrictions
2365 * @sip: the object end
2367 * looks for host based access restrictions
2369 * This version will only be appropriate for really small sets of single label
2370 * hosts. The caller is responsible for ensuring that the RCU read lock is
2371 * taken before calling this function.
2373 * Returns the label of the far end or NULL if it's not special.
2375 static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
2377 struct smk_net4addr *snp;
2378 struct in_addr *siap = &sip->sin_addr;
2380 if (siap->s_addr == 0)
2383 list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
2385 * we break after finding the first match because
2386 * the list is sorted from longest to shortest mask
2387 * so we have found the most specific match
2389 if (snp->smk_host.s_addr ==
2390 (siap->s_addr & snp->smk_mask.s_addr))
2391 return snp->smk_label;
2397 * smk_ipv6_localhost - Check for local ipv6 host address
2400 * Returns boolean true if this is the localhost address
2402 static bool smk_ipv6_localhost(struct sockaddr_in6 *sip)
2404 __be16 *be16p = (__be16 *)&sip->sin6_addr;
2405 __be32 *be32p = (__be32 *)&sip->sin6_addr;
2407 if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 &&
2408 ntohs(be16p[7]) == 1)
2414 * smack_ipv6host_label - check host based restrictions
2415 * @sip: the object end
2417 * looks for host based access restrictions
2419 * This version will only be appropriate for really small sets of single label
2420 * hosts. The caller is responsible for ensuring that the RCU read lock is
2421 * taken before calling this function.
2423 * Returns the label of the far end or NULL if it's not special.
2425 static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
2427 struct smk_net6addr *snp;
2428 struct in6_addr *sap = &sip->sin6_addr;
2433 * It's local. Don't look for a host label.
2435 if (smk_ipv6_localhost(sip))
2438 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
2440 * If the label is NULL the entry has
2441 * been renounced. Ignore it.
2443 if (snp->smk_label == NULL)
2446 * we break after finding the first match because
2447 * the list is sorted from longest to shortest mask
2448 * so we have found the most specific match
2450 for (found = 1, i = 0; i < 8; i++) {
2451 if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
2452 snp->smk_host.s6_addr16[i]) {
2458 return snp->smk_label;
2465 * smack_netlbl_add - Set the secattr on a socket
2468 * Attach the outbound smack value (smk_out) to the socket.
2470 * Returns 0 on success or an error code
2472 static int smack_netlbl_add(struct sock *sk)
2474 struct socket_smack *ssp = sk->sk_security;
2475 struct smack_known *skp = ssp->smk_out;
2479 bh_lock_sock_nested(sk);
2481 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
2484 ssp->smk_state = SMK_NETLBL_LABELED;
2487 ssp->smk_state = SMK_NETLBL_REQSKB;
2499 * smack_netlbl_delete - Remove the secattr from a socket
2502 * Remove the outbound smack value from a socket
2504 static void smack_netlbl_delete(struct sock *sk)
2506 struct socket_smack *ssp = sk->sk_security;
2509 * Take the label off the socket if one is set.
2511 if (ssp->smk_state != SMK_NETLBL_LABELED)
2515 bh_lock_sock_nested(sk);
2516 netlbl_sock_delattr(sk);
2519 ssp->smk_state = SMK_NETLBL_UNLABELED;
2523 * smk_ipv4_check - Perform IPv4 host access checks
2525 * @sap: the destination address
2527 * Set the correct secattr for the given socket based on the destination
2528 * address and perform any outbound access checks needed.
2530 * Returns 0 on success or an error code.
2533 static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap)
2535 struct smack_known *skp;
2537 struct smack_known *hkp;
2538 struct socket_smack *ssp = sk->sk_security;
2539 struct smk_audit_info ad;
2542 hkp = smack_ipv4host_label(sap);
2545 struct lsm_network_audit net;
2547 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2548 ad.a.u.net->family = sap->sin_family;
2549 ad.a.u.net->dport = sap->sin_port;
2550 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
2553 rc = smk_access(skp, hkp, MAY_WRITE, &ad);
2554 rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
2556 * Clear the socket netlabel if it's set.
2559 smack_netlbl_delete(sk);
2567 * smk_ipv6_check - check Smack access
2568 * @subject: subject Smack label
2569 * @object: object Smack label
2571 * @act: the action being taken
2573 * Check an IPv6 access
2575 static int smk_ipv6_check(struct smack_known *subject,
2576 struct smack_known *object,
2577 struct sockaddr_in6 *address, int act)
2580 struct lsm_network_audit net;
2582 struct smk_audit_info ad;
2586 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2587 ad.a.u.net->family = PF_INET6;
2588 ad.a.u.net->dport = address->sin6_port;
2589 if (act == SMK_RECEIVING)
2590 ad.a.u.net->v6info.saddr = address->sin6_addr;
2592 ad.a.u.net->v6info.daddr = address->sin6_addr;
2594 rc = smk_access(subject, object, MAY_WRITE, &ad);
2595 rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
2599 #ifdef SMACK_IPV6_PORT_LABELING
2601 * smk_ipv6_port_label - Smack port access table management
2605 * Create or update the port list entry
2607 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
2609 struct sock *sk = sock->sk;
2610 struct sockaddr_in6 *addr6;
2611 struct socket_smack *ssp = sock->sk->sk_security;
2612 struct smk_port_label *spp;
2613 unsigned short port = 0;
2615 if (address == NULL) {
2617 * This operation is changing the Smack information
2618 * on the bound socket. Take the changes to the port
2622 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2623 if (sk != spp->smk_sock)
2625 spp->smk_in = ssp->smk_in;
2626 spp->smk_out = ssp->smk_out;
2631 * A NULL address is only used for updating existing
2632 * bound entries. If there isn't one, it's OK.
2638 addr6 = (struct sockaddr_in6 *)address;
2639 port = ntohs(addr6->sin6_port);
2641 * This is a special case that is safely ignored.
2647 * Look for an existing port list entry.
2648 * This is an indication that a port is getting reused.
2651 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2652 if (spp->smk_port != port || spp->smk_sock_type != sock->type)
2654 if (spp->smk_can_reuse != 1) {
2658 spp->smk_port = port;
2660 spp->smk_in = ssp->smk_in;
2661 spp->smk_out = ssp->smk_out;
2662 spp->smk_can_reuse = 0;
2668 * A new port entry is required.
2670 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
2674 spp->smk_port = port;
2676 spp->smk_in = ssp->smk_in;
2677 spp->smk_out = ssp->smk_out;
2678 spp->smk_sock_type = sock->type;
2679 spp->smk_can_reuse = 0;
2681 mutex_lock(&smack_ipv6_lock);
2682 list_add_rcu(&spp->list, &smk_ipv6_port_list);
2683 mutex_unlock(&smack_ipv6_lock);
2688 * smk_ipv6_port_check - check Smack port access
2691 * @act: the action being taken
2693 * Create or update the port list entry
2695 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2698 struct smk_port_label *spp;
2699 struct socket_smack *ssp = sk->sk_security;
2700 struct smack_known *skp = NULL;
2701 unsigned short port;
2702 struct smack_known *object;
2704 if (act == SMK_RECEIVING) {
2705 skp = smack_ipv6host_label(address);
2706 object = ssp->smk_in;
2709 object = smack_ipv6host_label(address);
2713 * The other end is a single label host.
2715 if (skp != NULL && object != NULL)
2716 return smk_ipv6_check(skp, object, address, act);
2718 skp = smack_net_ambient;
2720 object = smack_net_ambient;
2723 * It's remote, so port lookup does no good.
2725 if (!smk_ipv6_localhost(address))
2726 return smk_ipv6_check(skp, object, address, act);
2729 * It's local so the send check has to have passed.
2731 if (act == SMK_RECEIVING)
2734 port = ntohs(address->sin6_port);
2736 list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
2737 if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
2739 object = spp->smk_in;
2740 if (act == SMK_CONNECTING)
2741 ssp->smk_packet = spp->smk_out;
2746 return smk_ipv6_check(skp, object, address, act);
2751 * smack_inode_setsecurity - set smack xattrs
2752 * @inode: the object
2753 * @name: attribute name
2754 * @value: attribute value
2755 * @size: size of the attribute
2758 * Sets the named attribute in the appropriate blob
2760 * Returns 0 on success, or an error code
2762 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2763 const void *value, size_t size, int flags)
2765 struct smack_known *skp;
2766 struct inode_smack *nsp = smack_inode(inode);
2767 struct socket_smack *ssp;
2768 struct socket *sock;
2771 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2774 skp = smk_import_entry(value, size);
2776 return PTR_ERR(skp);
2778 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2779 nsp->smk_inode = skp;
2780 nsp->smk_flags |= SMK_INODE_INSTANT;
2784 * The rest of the Smack xattrs are only on sockets.
2786 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2789 sock = SOCKET_I(inode);
2790 if (sock == NULL || sock->sk == NULL)
2793 ssp = sock->sk->sk_security;
2795 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2797 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2799 if (sock->sk->sk_family == PF_INET) {
2800 rc = smack_netlbl_add(sock->sk);
2803 "Smack: \"%s\" netlbl error %d.\n",
2809 #ifdef SMACK_IPV6_PORT_LABELING
2810 if (sock->sk->sk_family == PF_INET6)
2811 smk_ipv6_port_label(sock, NULL);
2818 * smack_socket_post_create - finish socket setup
2820 * @family: protocol family
2825 * Sets the netlabel information on the socket
2827 * Returns 0 on success, and error code otherwise
2829 static int smack_socket_post_create(struct socket *sock, int family,
2830 int type, int protocol, int kern)
2832 struct socket_smack *ssp;
2834 if (sock->sk == NULL)
2838 * Sockets created by kernel threads receive web label.
2840 if (unlikely(current->flags & PF_KTHREAD)) {
2841 ssp = sock->sk->sk_security;
2842 ssp->smk_in = &smack_known_web;
2843 ssp->smk_out = &smack_known_web;
2846 if (family != PF_INET)
2849 * Set the outbound netlbl.
2851 return smack_netlbl_add(sock->sk);
2855 * smack_socket_socketpair - create socket pair
2856 * @socka: one socket
2857 * @sockb: another socket
2859 * Cross reference the peer labels for SO_PEERSEC
2863 static int smack_socket_socketpair(struct socket *socka,
2864 struct socket *sockb)
2866 struct socket_smack *asp = socka->sk->sk_security;
2867 struct socket_smack *bsp = sockb->sk->sk_security;
2869 asp->smk_packet = bsp->smk_out;
2870 bsp->smk_packet = asp->smk_out;
2875 #ifdef SMACK_IPV6_PORT_LABELING
2877 * smack_socket_bind - record port binding information.
2879 * @address: the port address
2880 * @addrlen: size of the address
2882 * Records the label bound to a port.
2884 * Returns 0 on success, and error code otherwise
2886 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2889 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) {
2890 if (addrlen < SIN6_LEN_RFC2133 ||
2891 address->sa_family != AF_INET6)
2893 smk_ipv6_port_label(sock, address);
2897 #endif /* SMACK_IPV6_PORT_LABELING */
2900 * smack_socket_connect - connect access check
2902 * @sap: the other end
2903 * @addrlen: size of sap
2905 * Verifies that a connection may be possible
2907 * Returns 0 on success, and error code otherwise
2909 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2914 if (sock->sk == NULL)
2916 if (sock->sk->sk_family != PF_INET &&
2917 (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6))
2919 if (addrlen < offsetofend(struct sockaddr, sa_family))
2921 if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) {
2922 struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
2923 struct smack_known *rsp = NULL;
2925 if (addrlen < SIN6_LEN_RFC2133)
2927 if (__is_defined(SMACK_IPV6_SECMARK_LABELING))
2928 rsp = smack_ipv6host_label(sip);
2930 struct socket_smack *ssp = sock->sk->sk_security;
2932 rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
2935 #ifdef SMACK_IPV6_PORT_LABELING
2936 rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);
2941 if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
2943 rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap);
2948 * smack_flags_to_may - convert S_ to MAY_ values
2949 * @flags: the S_ value
2951 * Returns the equivalent MAY_ value
2953 static int smack_flags_to_may(int flags)
2957 if (flags & S_IRUGO)
2959 if (flags & S_IWUGO)
2961 if (flags & S_IXUGO)
2968 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2973 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2975 struct smack_known **blob = smack_msg_msg(msg);
2977 *blob = smk_of_current();
2982 * smack_of_ipc - the smack pointer for the ipc
2985 * Returns a pointer to the smack value
2987 static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
2989 struct smack_known **blob = smack_ipc(isp);
2995 * smack_ipc_alloc_security - Set the security blob for ipc
3000 static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
3002 struct smack_known **blob = smack_ipc(isp);
3004 *blob = smk_of_current();
3009 * smk_curacc_shm : check if current has access on shm
3011 * @access : access requested
3013 * Returns 0 if current has the requested access, error code otherwise
3015 static int smk_curacc_shm(struct kern_ipc_perm *isp, int access)
3017 struct smack_known *ssp = smack_of_ipc(isp);
3018 struct smk_audit_info ad;
3022 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3023 ad.a.u.ipc_id = isp->id;
3025 rc = smk_curacc(ssp, access, &ad);
3026 rc = smk_bu_current("shm", ssp, access, rc);
3031 * smack_shm_associate - Smack access check for shm
3033 * @shmflg: access requested
3035 * Returns 0 if current has the requested access, error code otherwise
3037 static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg)
3041 may = smack_flags_to_may(shmflg);
3042 return smk_curacc_shm(isp, may);
3046 * smack_shm_shmctl - Smack access check for shm
3048 * @cmd: what it wants to do
3050 * Returns 0 if current has the requested access, error code otherwise
3052 static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd)
3066 may = MAY_READWRITE;
3071 * System level information.
3077 return smk_curacc_shm(isp, may);
3081 * smack_shm_shmat - Smack access for shmat
3084 * @shmflg: access requested
3086 * Returns 0 if current has the requested access, error code otherwise
3088 static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr,
3093 may = smack_flags_to_may(shmflg);
3094 return smk_curacc_shm(isp, may);
3098 * smk_curacc_sem : check if current has access on sem
3100 * @access : access requested
3102 * Returns 0 if current has the requested access, error code otherwise
3104 static int smk_curacc_sem(struct kern_ipc_perm *isp, int access)
3106 struct smack_known *ssp = smack_of_ipc(isp);
3107 struct smk_audit_info ad;
3111 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3112 ad.a.u.ipc_id = isp->id;
3114 rc = smk_curacc(ssp, access, &ad);
3115 rc = smk_bu_current("sem", ssp, access, rc);
3120 * smack_sem_associate - Smack access check for sem
3122 * @semflg: access requested
3124 * Returns 0 if current has the requested access, error code otherwise
3126 static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg)
3130 may = smack_flags_to_may(semflg);
3131 return smk_curacc_sem(isp, may);
3135 * smack_sem_semctl - Smack access check for sem
3137 * @cmd: what it wants to do
3139 * Returns 0 if current has the requested access, error code otherwise
3141 static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd)
3160 may = MAY_READWRITE;
3165 * System level information
3172 return smk_curacc_sem(isp, may);
3176 * smack_sem_semop - Smack checks of semaphore operations
3182 * Treated as read and write in all cases.
3184 * Returns 0 if access is allowed, error code otherwise
3186 static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
3187 unsigned nsops, int alter)
3189 return smk_curacc_sem(isp, MAY_READWRITE);
3193 * smk_curacc_msq : helper to check if current has access on msq
3195 * @access : access requested
3197 * return 0 if current has access, error otherwise
3199 static int smk_curacc_msq(struct kern_ipc_perm *isp, int access)
3201 struct smack_known *msp = smack_of_ipc(isp);
3202 struct smk_audit_info ad;
3206 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3207 ad.a.u.ipc_id = isp->id;
3209 rc = smk_curacc(msp, access, &ad);
3210 rc = smk_bu_current("msq", msp, access, rc);
3215 * smack_msg_queue_associate - Smack access check for msg_queue
3217 * @msqflg: access requested
3219 * Returns 0 if current has the requested access, error code otherwise
3221 static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg)
3225 may = smack_flags_to_may(msqflg);
3226 return smk_curacc_msq(isp, may);
3230 * smack_msg_queue_msgctl - Smack access check for msg_queue
3232 * @cmd: what it wants to do
3234 * Returns 0 if current has the requested access, error code otherwise
3236 static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd)
3248 may = MAY_READWRITE;
3253 * System level information
3260 return smk_curacc_msq(isp, may);
3264 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3267 * @msqflg: access requested
3269 * Returns 0 if current has the requested access, error code otherwise
3271 static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg,
3276 may = smack_flags_to_may(msqflg);
3277 return smk_curacc_msq(isp, may);
3281 * smack_msg_queue_msgrcv - Smack access check for msg_queue
3288 * Returns 0 if current has read and write access, error code otherwise
3290 static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp,
3291 struct msg_msg *msg,
3292 struct task_struct *target, long type,
3295 return smk_curacc_msq(isp, MAY_READWRITE);
3299 * smack_ipc_permission - Smack access for ipc_permission()
3300 * @ipp: the object permissions
3301 * @flag: access requested
3303 * Returns 0 if current has read and write access, error code otherwise
3305 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
3307 struct smack_known **blob = smack_ipc(ipp);
3308 struct smack_known *iskp = *blob;
3309 int may = smack_flags_to_may(flag);
3310 struct smk_audit_info ad;
3314 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
3315 ad.a.u.ipc_id = ipp->id;
3317 rc = smk_curacc(iskp, may, &ad);
3318 rc = smk_bu_current("svipc", iskp, may, rc);
3323 * smack_ipc_getsecid - Extract smack security id
3324 * @ipp: the object permissions
3325 * @secid: where result will be saved
3327 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
3329 struct smack_known **blob = smack_ipc(ipp);
3330 struct smack_known *iskp = *blob;
3332 *secid = iskp->smk_secid;
3336 * smack_d_instantiate - Make sure the blob is correct on an inode
3337 * @opt_dentry: dentry where inode will be attached
3338 * @inode: the object
3340 * Set the inode's security blob if it hasn't been done already.
3342 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
3344 struct super_block *sbp;
3345 struct superblock_smack *sbsp;
3346 struct inode_smack *isp;
3347 struct smack_known *skp;
3348 struct smack_known *ckp = smk_of_current();
3349 struct smack_known *final;
3350 char trattr[TRANS_TRUE_SIZE];
3358 isp = smack_inode(inode);
3361 * If the inode is already instantiated
3362 * take the quick way out
3364 if (isp->smk_flags & SMK_INODE_INSTANT)
3368 sbsp = smack_superblock(sbp);
3370 * We're going to use the superblock default label
3371 * if there's no label on the file.
3373 final = sbsp->smk_default;
3376 * If this is the root inode the superblock
3377 * may be in the process of initialization.
3378 * If that is the case use the root value out
3379 * of the superblock.
3381 if (opt_dentry->d_parent == opt_dentry) {
3382 switch (sbp->s_magic) {
3383 case CGROUP_SUPER_MAGIC:
3384 case CGROUP2_SUPER_MAGIC:
3386 * The cgroup filesystem is never mounted,
3387 * so there's no opportunity to set the mount
3390 sbsp->smk_root = &smack_known_star;
3391 sbsp->smk_default = &smack_known_star;
3392 isp->smk_inode = sbsp->smk_root;
3396 * What about shmem/tmpfs anonymous files with dentry
3397 * obtained from d_alloc_pseudo()?
3399 isp->smk_inode = smk_of_current();
3402 isp->smk_inode = smk_of_current();
3406 * Socket access is controlled by the socket
3407 * structures associated with the task involved.
3409 isp->smk_inode = &smack_known_star;
3412 isp->smk_inode = sbsp->smk_root;
3415 isp->smk_flags |= SMK_INODE_INSTANT;
3420 * This is pretty hackish.
3421 * Casey says that we shouldn't have to do
3422 * file system specific code, but it does help
3423 * with keeping it simple.
3425 switch (sbp->s_magic) {
3427 case CGROUP_SUPER_MAGIC:
3428 case CGROUP2_SUPER_MAGIC:
3430 * Casey says that it's a little embarrassing
3431 * that the smack file system doesn't do
3432 * extended attributes.
3434 * Cgroupfs is special
3436 final = &smack_known_star;
3438 case DEVPTS_SUPER_MAGIC:
3440 * devpts seems content with the label of the task.
3441 * Programs that change smack have to treat the
3446 case PROC_SUPER_MAGIC:
3448 * Casey says procfs appears not to care.
3449 * The superblock default suffices.
3454 * Device labels should come from the filesystem,
3455 * but watch out, because they're volitile,
3456 * getting recreated on every reboot.
3458 final = &smack_known_star;
3460 * If a smack value has been set we want to use it,
3461 * but since tmpfs isn't giving us the opportunity
3462 * to set mount options simulate setting the
3463 * superblock default.
3468 * This isn't an understood special case.
3469 * Get the value from the xattr.
3473 * UNIX domain sockets use lower level socket data.
3475 if (S_ISSOCK(inode->i_mode)) {
3476 final = &smack_known_star;
3480 * No xattr support means, alas, no SMACK label.
3481 * Use the aforeapplied default.
3482 * It would be curious if the label of the task
3483 * does not match that assigned.
3485 if (!(inode->i_opflags & IOP_XATTR))
3488 * Get the dentry for xattr.
3490 dp = dget(opt_dentry);
3491 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
3492 if (!IS_ERR_OR_NULL(skp))
3496 * Transmuting directory
3498 if (S_ISDIR(inode->i_mode)) {
3500 * If this is a new directory and the label was
3501 * transmuted when the inode was initialized
3502 * set the transmute attribute on the directory
3503 * and mark the inode.
3505 * If there is a transmute attribute on the
3506 * directory mark the inode.
3508 if (isp->smk_flags & SMK_INODE_CHANGED) {
3509 isp->smk_flags &= ~SMK_INODE_CHANGED;
3510 rc = __vfs_setxattr(&nop_mnt_idmap, dp, inode,
3511 XATTR_NAME_SMACKTRANSMUTE,
3512 TRANS_TRUE, TRANS_TRUE_SIZE,
3515 rc = __vfs_getxattr(dp, inode,
3516 XATTR_NAME_SMACKTRANSMUTE, trattr,
3518 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
3519 TRANS_TRUE_SIZE) != 0)
3523 transflag = SMK_INODE_TRANSMUTE;
3526 * Don't let the exec or mmap label be "*" or "@".
3528 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
3529 if (IS_ERR(skp) || skp == &smack_known_star ||
3530 skp == &smack_known_web)
3532 isp->smk_task = skp;
3534 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
3535 if (IS_ERR(skp) || skp == &smack_known_star ||
3536 skp == &smack_known_web)
3538 isp->smk_mmap = skp;
3545 isp->smk_inode = ckp;
3547 isp->smk_inode = final;
3549 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
3555 * smack_getprocattr - Smack process attribute access
3556 * @p: the object task
3557 * @name: the name of the attribute in /proc/.../attr
3558 * @value: where to put the result
3560 * Places a copy of the task Smack into value
3562 * Returns the length of the smack label or an error code
3564 static int smack_getprocattr(struct task_struct *p, const char *name, char **value)
3566 struct smack_known *skp = smk_of_task_struct_obj(p);
3570 if (strcmp(name, "current") != 0)
3573 cp = kstrdup(skp->smk_known, GFP_KERNEL);
3583 * smack_setprocattr - Smack process attribute setting
3584 * @name: the name of the attribute in /proc/.../attr
3585 * @value: the value to set
3586 * @size: the size of the value
3588 * Sets the Smack value of the task. Only setting self
3589 * is permitted and only with privilege
3591 * Returns the length of the smack label or an error code
3593 static int smack_setprocattr(const char *name, void *value, size_t size)
3595 struct task_smack *tsp = smack_cred(current_cred());
3597 struct smack_known *skp;
3598 struct smack_known_list_elem *sklep;
3601 if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
3604 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
3607 if (strcmp(name, "current") != 0)
3610 skp = smk_import_entry(value, size);
3612 return PTR_ERR(skp);
3615 * No process is ever allowed the web ("@") label
3616 * and the star ("*") label.
3618 if (skp == &smack_known_web || skp == &smack_known_star)
3621 if (!smack_privileged(CAP_MAC_ADMIN)) {
3623 list_for_each_entry(sklep, &tsp->smk_relabel, list)
3624 if (sklep->smk_label == skp) {
3632 new = prepare_creds();
3636 tsp = smack_cred(new);
3637 tsp->smk_task = skp;
3639 * process can change its label only once
3641 smk_destroy_label_list(&tsp->smk_relabel);
3648 * smack_unix_stream_connect - Smack access on UDS
3650 * @other: the other sock
3653 * Return 0 if a subject with the smack of sock could access
3654 * an object with the smack of other, otherwise an error code
3656 static int smack_unix_stream_connect(struct sock *sock,
3657 struct sock *other, struct sock *newsk)
3659 struct smack_known *skp;
3660 struct smack_known *okp;
3661 struct socket_smack *ssp = sock->sk_security;
3662 struct socket_smack *osp = other->sk_security;
3663 struct socket_smack *nsp = newsk->sk_security;
3664 struct smk_audit_info ad;
3667 struct lsm_network_audit net;
3670 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
3674 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3675 smk_ad_setfield_u_net_sk(&ad, other);
3677 rc = smk_access(skp, okp, MAY_WRITE, &ad);
3678 rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
3682 rc = smk_access(okp, skp, MAY_WRITE, &ad);
3683 rc = smk_bu_note("UDS connect", okp, skp,
3689 * Cross reference the peer labels for SO_PEERSEC.
3692 nsp->smk_packet = ssp->smk_out;
3693 ssp->smk_packet = osp->smk_out;
3700 * smack_unix_may_send - Smack access on UDS
3702 * @other: the other socket
3704 * Return 0 if a subject with the smack of sock could access
3705 * an object with the smack of other, otherwise an error code
3707 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3709 struct socket_smack *ssp = sock->sk->sk_security;
3710 struct socket_smack *osp = other->sk->sk_security;
3711 struct smk_audit_info ad;
3715 struct lsm_network_audit net;
3717 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3718 smk_ad_setfield_u_net_sk(&ad, other->sk);
3721 if (smack_privileged(CAP_MAC_OVERRIDE))
3724 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
3725 rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc);
3730 * smack_socket_sendmsg - Smack check based on destination host
3733 * @size: the size of the message
3735 * Return 0 if the current subject can write to the destination host.
3736 * For IPv4 this is only a question if the destination is a single label host.
3737 * For IPv6 this is a check against the label of the port.
3739 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3742 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3743 #if IS_ENABLED(CONFIG_IPV6)
3744 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3746 #ifdef SMACK_IPV6_SECMARK_LABELING
3747 struct socket_smack *ssp = sock->sk->sk_security;
3748 struct smack_known *rsp;
3753 * Perfectly reasonable for this to be NULL
3758 switch (sock->sk->sk_family) {
3760 if (msg->msg_namelen < sizeof(struct sockaddr_in) ||
3761 sip->sin_family != AF_INET)
3763 rc = smk_ipv4_check(sock->sk, sip);
3765 #if IS_ENABLED(CONFIG_IPV6)
3767 if (msg->msg_namelen < SIN6_LEN_RFC2133 ||
3768 sap->sin6_family != AF_INET6)
3770 #ifdef SMACK_IPV6_SECMARK_LABELING
3771 rsp = smack_ipv6host_label(sap);
3773 rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
3776 #ifdef SMACK_IPV6_PORT_LABELING
3777 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3779 #endif /* IS_ENABLED(CONFIG_IPV6) */
3786 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3787 * @sap: netlabel secattr
3788 * @ssp: socket security information
3790 * Returns a pointer to a Smack label entry found on the label list.
3792 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3793 struct socket_smack *ssp)
3795 struct smack_known *skp;
3801 * Netlabel found it in the cache.
3803 if ((sap->flags & NETLBL_SECATTR_CACHE) != 0)
3804 return (struct smack_known *)sap->cache->data;
3806 if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
3808 * Looks like a fallback, which gives us a secid.
3810 return smack_from_secid(sap->attr.secid);
3812 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3814 * Looks like a CIPSO packet.
3815 * If there are flags but no level netlabel isn't
3816 * behaving the way we expect it to.
3818 * Look it up in the label table
3819 * Without guidance regarding the smack value
3820 * for the packet fall back on the network
3824 list_for_each_entry_rcu(skp, &smack_known_list, list) {
3825 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3828 * Compare the catsets. Use the netlbl APIs.
3830 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3831 if ((skp->smk_netlabel.flags &
3832 NETLBL_SECATTR_MLS_CAT) == 0)
3836 for (acat = -1, kcat = -1; acat == kcat; ) {
3837 acat = netlbl_catmap_walk(sap->attr.mls.cat,
3839 kcat = netlbl_catmap_walk(
3840 skp->smk_netlabel.attr.mls.cat,
3842 if (acat < 0 || kcat < 0)
3855 if (ssp != NULL && ssp->smk_in == &smack_known_star)
3856 return &smack_known_web;
3857 return &smack_known_star;
3860 * Without guidance regarding the smack value
3861 * for the packet fall back on the network
3864 return smack_net_ambient;
3867 #if IS_ENABLED(CONFIG_IPV6)
3868 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3872 int proto = -EINVAL;
3873 struct ipv6hdr _ipv6h;
3874 struct ipv6hdr *ip6;
3876 struct tcphdr _tcph, *th;
3877 struct udphdr _udph, *uh;
3878 struct dccp_hdr _dccph, *dh;
3882 offset = skb_network_offset(skb);
3883 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3886 sip->sin6_addr = ip6->saddr;
3888 nexthdr = ip6->nexthdr;
3889 offset += sizeof(_ipv6h);
3890 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3897 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3899 sip->sin6_port = th->source;
3902 case IPPROTO_UDPLITE:
3903 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3905 sip->sin6_port = uh->source;
3908 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3910 sip->sin6_port = dh->dccph_sport;
3915 #endif /* CONFIG_IPV6 */
3918 * smack_from_skb - Smack data from the secmark in an skb
3921 * Returns smack_known of the secmark or NULL if that won't work.
3923 #ifdef CONFIG_NETWORK_SECMARK
3924 static struct smack_known *smack_from_skb(struct sk_buff *skb)
3926 if (skb == NULL || skb->secmark == 0)
3929 return smack_from_secid(skb->secmark);
3932 static inline struct smack_known *smack_from_skb(struct sk_buff *skb)
3939 * smack_from_netlbl - Smack data from the IP options in an skb
3940 * @sk: socket data came in on
3941 * @family: address family
3944 * Find the Smack label in the IP options. If it hasn't been
3945 * added to the netlabel cache, add it here.
3947 * Returns smack_known of the IP options or NULL if that won't work.
3949 static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family,
3950 struct sk_buff *skb)
3952 struct netlbl_lsm_secattr secattr;
3953 struct socket_smack *ssp = NULL;
3954 struct smack_known *skp = NULL;
3956 netlbl_secattr_init(&secattr);
3959 ssp = sk->sk_security;
3961 if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) {
3962 skp = smack_from_secattr(&secattr, ssp);
3963 if (secattr.flags & NETLBL_SECATTR_CACHEABLE)
3964 netlbl_cache_add(skb, family, &skp->smk_netlabel);
3967 netlbl_secattr_destroy(&secattr);
3973 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3977 * Returns 0 if the packet should be delivered, an error code otherwise
3979 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3981 struct socket_smack *ssp = sk->sk_security;
3982 struct smack_known *skp = NULL;
3984 struct smk_audit_info ad;
3985 u16 family = sk->sk_family;
3987 struct lsm_network_audit net;
3989 #if IS_ENABLED(CONFIG_IPV6)
3990 struct sockaddr_in6 sadd;
3993 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3995 #endif /* CONFIG_IPV6 */
4000 * If there is a secmark use it rather than the CIPSO label.
4001 * If there is no secmark fall back to CIPSO.
4002 * The secmark is assumed to reflect policy better.
4004 skp = smack_from_skb(skb);
4006 skp = smack_from_netlbl(sk, family, skb);
4008 skp = smack_net_ambient;
4012 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4013 ad.a.u.net->family = family;
4014 ad.a.u.net->netif = skb->skb_iif;
4015 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4018 * Receiving a packet requires that the other end
4019 * be able to write here. Read access is not required.
4020 * This is the simplist possible security model
4023 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4024 rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
4027 netlbl_skbuff_err(skb, family, rc, 0);
4029 #if IS_ENABLED(CONFIG_IPV6)
4031 proto = smk_skb_to_addr_ipv6(skb, &sadd);
4032 if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE &&
4033 proto != IPPROTO_TCP && proto != IPPROTO_DCCP)
4035 #ifdef SMACK_IPV6_SECMARK_LABELING
4036 skp = smack_from_skb(skb);
4038 if (smk_ipv6_localhost(&sadd))
4040 skp = smack_ipv6host_label(&sadd);
4042 skp = smack_net_ambient;
4045 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4046 ad.a.u.net->family = family;
4047 ad.a.u.net->netif = skb->skb_iif;
4048 ipv6_skb_to_auditdata(skb, &ad.a, NULL);
4049 #endif /* CONFIG_AUDIT */
4050 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4051 rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
4053 #endif /* SMACK_IPV6_SECMARK_LABELING */
4054 #ifdef SMACK_IPV6_PORT_LABELING
4055 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
4056 #endif /* SMACK_IPV6_PORT_LABELING */
4058 icmpv6_send(skb, ICMPV6_DEST_UNREACH,
4059 ICMPV6_ADM_PROHIBITED, 0);
4061 #endif /* CONFIG_IPV6 */
4068 * smack_socket_getpeersec_stream - pull in packet label
4070 * @optval: user's destination
4071 * @optlen: size thereof
4074 * returns zero on success, an error code otherwise
4076 static int smack_socket_getpeersec_stream(struct socket *sock,
4077 sockptr_t optval, sockptr_t optlen,
4080 struct socket_smack *ssp;
4085 ssp = sock->sk->sk_security;
4086 if (ssp->smk_packet != NULL) {
4087 rcp = ssp->smk_packet->smk_known;
4088 slen = strlen(rcp) + 1;
4095 if (copy_to_sockptr(optval, rcp, slen))
4098 if (copy_to_sockptr(optlen, &slen, sizeof(slen)))
4105 * smack_socket_getpeersec_dgram - pull in packet label
4106 * @sock: the peer socket
4108 * @secid: pointer to where to put the secid of the packet
4110 * Sets the netlabel socket state on sk from parent
4112 static int smack_socket_getpeersec_dgram(struct socket *sock,
4113 struct sk_buff *skb, u32 *secid)
4116 struct socket_smack *ssp = NULL;
4117 struct smack_known *skp;
4118 struct sock *sk = NULL;
4119 int family = PF_UNSPEC;
4120 u32 s = 0; /* 0 is the invalid secid */
4123 if (skb->protocol == htons(ETH_P_IP))
4125 #if IS_ENABLED(CONFIG_IPV6)
4126 else if (skb->protocol == htons(ETH_P_IPV6))
4128 #endif /* CONFIG_IPV6 */
4130 if (family == PF_UNSPEC && sock != NULL)
4131 family = sock->sk->sk_family;
4135 ssp = sock->sk->sk_security;
4136 s = ssp->smk_out->smk_secid;
4139 skp = smack_from_skb(skb);
4145 * Translate what netlabel gave us.
4149 skp = smack_from_netlbl(sk, family, skb);
4154 #ifdef SMACK_IPV6_SECMARK_LABELING
4155 skp = smack_from_skb(skb);
4168 * smack_sock_graft - Initialize a newly created socket with an existing sock
4170 * @parent: parent socket
4172 * Set the smk_{in,out} state of an existing sock based on the process that
4173 * is creating the new socket.
4175 static void smack_sock_graft(struct sock *sk, struct socket *parent)
4177 struct socket_smack *ssp;
4178 struct smack_known *skp = smk_of_current();
4181 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
4184 ssp = sk->sk_security;
4187 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4191 * smack_inet_conn_request - Smack access check on connect
4192 * @sk: socket involved
4196 * Returns 0 if a task with the packet label could write to
4197 * the socket, otherwise an error code
4199 static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
4200 struct request_sock *req)
4202 u16 family = sk->sk_family;
4203 struct smack_known *skp;
4204 struct socket_smack *ssp = sk->sk_security;
4205 struct sockaddr_in addr;
4207 struct smack_known *hskp;
4209 struct smk_audit_info ad;
4211 struct lsm_network_audit net;
4214 #if IS_ENABLED(CONFIG_IPV6)
4215 if (family == PF_INET6) {
4217 * Handle mapped IPv4 packets arriving
4218 * via IPv6 sockets. Don't set up netlabel
4219 * processing on IPv6.
4221 if (skb->protocol == htons(ETH_P_IP))
4226 #endif /* CONFIG_IPV6 */
4229 * If there is a secmark use it rather than the CIPSO label.
4230 * If there is no secmark fall back to CIPSO.
4231 * The secmark is assumed to reflect policy better.
4233 skp = smack_from_skb(skb);
4235 skp = smack_from_netlbl(sk, family, skb);
4237 skp = &smack_known_huh;
4241 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
4242 ad.a.u.net->family = family;
4243 ad.a.u.net->netif = skb->skb_iif;
4244 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
4247 * Receiving a packet requires that the other end be able to write
4248 * here. Read access is not required.
4250 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
4251 rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
4256 * Save the peer's label in the request_sock so we can later setup
4257 * smk_packet in the child socket so that SO_PEERCRED can report it.
4259 req->peer_secid = skp->smk_secid;
4262 * We need to decide if we want to label the incoming connection here
4263 * if we do we only need to label the request_sock and the stack will
4264 * propagate the wire-label to the sock when it is created.
4267 addr.sin_addr.s_addr = hdr->saddr;
4269 hskp = smack_ipv4host_label(&addr);
4273 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
4275 netlbl_req_delattr(req);
4281 * smack_inet_csk_clone - Copy the connection information to the new socket
4282 * @sk: the new socket
4283 * @req: the connection's request_sock
4285 * Transfer the connection's peer label to the newly created socket.
4287 static void smack_inet_csk_clone(struct sock *sk,
4288 const struct request_sock *req)
4290 struct socket_smack *ssp = sk->sk_security;
4291 struct smack_known *skp;
4293 if (req->peer_secid != 0) {
4294 skp = smack_from_secid(req->peer_secid);
4295 ssp->smk_packet = skp;
4297 ssp->smk_packet = NULL;
4301 * Key management security hooks
4303 * Casey has not tested key support very heavily.
4304 * The permission check is most likely too restrictive.
4305 * If you care about keys please have a look.
4310 * smack_key_alloc - Set the key security blob
4312 * @cred: the credentials to use
4315 * No allocation required
4319 static int smack_key_alloc(struct key *key, const struct cred *cred,
4320 unsigned long flags)
4322 struct smack_known *skp = smk_of_task(smack_cred(cred));
4324 key->security = skp;
4329 * smack_key_free - Clear the key security blob
4332 * Clear the blob pointer
4334 static void smack_key_free(struct key *key)
4336 key->security = NULL;
4340 * smack_key_permission - Smack access on a key
4341 * @key_ref: gets to the object
4342 * @cred: the credentials to use
4343 * @need_perm: requested key permission
4345 * Return 0 if the task has read and write to the object,
4346 * an error code otherwise
4348 static int smack_key_permission(key_ref_t key_ref,
4349 const struct cred *cred,
4350 enum key_need_perm need_perm)
4353 struct smk_audit_info ad;
4354 struct smack_known *tkp = smk_of_task(smack_cred(cred));
4359 * Validate requested permissions
4361 switch (need_perm) {
4363 case KEY_NEED_SEARCH:
4365 request |= MAY_READ;
4367 case KEY_NEED_WRITE:
4369 case KEY_NEED_SETATTR:
4370 request |= MAY_WRITE;
4372 case KEY_NEED_UNSPECIFIED:
4373 case KEY_NEED_UNLINK:
4374 case KEY_SYSADMIN_OVERRIDE:
4375 case KEY_AUTHTOKEN_OVERRIDE:
4376 case KEY_DEFER_PERM_CHECK:
4382 keyp = key_ref_to_ptr(key_ref);
4386 * If the key hasn't been initialized give it access so that
4389 if (keyp->security == NULL)
4392 * This should not occur
4397 if (smack_privileged(CAP_MAC_OVERRIDE))
4401 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4402 ad.a.u.key_struct.key = keyp->serial;
4403 ad.a.u.key_struct.key_desc = keyp->description;
4405 rc = smk_access(tkp, keyp->security, request, &ad);
4406 rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
4411 * smack_key_getsecurity - Smack label tagging the key
4412 * @key points to the key to be queried
4413 * @_buffer points to a pointer that should be set to point to the
4414 * resulting string (if no label or an error occurs).
4415 * Return the length of the string (including terminating NUL) or -ve if
4417 * May also return 0 (and a NULL buffer pointer) if there is no label.
4419 static int smack_key_getsecurity(struct key *key, char **_buffer)
4421 struct smack_known *skp = key->security;
4425 if (key->security == NULL) {
4430 copy = kstrdup(skp->smk_known, GFP_KERNEL);
4433 length = strlen(copy) + 1;
4440 #ifdef CONFIG_KEY_NOTIFICATIONS
4442 * smack_watch_key - Smack access to watch a key for notifications.
4443 * @key: The key to be watched
4445 * Return 0 if the @watch->cred has permission to read from the key object and
4446 * an error otherwise.
4448 static int smack_watch_key(struct key *key)
4450 struct smk_audit_info ad;
4451 struct smack_known *tkp = smk_of_current();
4457 * If the key hasn't been initialized give it access so that
4460 if (key->security == NULL)
4463 * This should not occur
4468 if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred()))
4472 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
4473 ad.a.u.key_struct.key = key->serial;
4474 ad.a.u.key_struct.key_desc = key->description;
4476 rc = smk_access(tkp, key->security, MAY_READ, &ad);
4477 rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc);
4480 #endif /* CONFIG_KEY_NOTIFICATIONS */
4481 #endif /* CONFIG_KEYS */
4483 #ifdef CONFIG_WATCH_QUEUE
4485 * smack_post_notification - Smack access to post a notification to a queue
4486 * @w_cred: The credentials of the watcher.
4487 * @cred: The credentials of the event source (may be NULL).
4488 * @n: The notification message to be posted.
4490 static int smack_post_notification(const struct cred *w_cred,
4491 const struct cred *cred,
4492 struct watch_notification *n)
4494 struct smk_audit_info ad;
4495 struct smack_known *subj, *obj;
4498 /* Always let maintenance notifications through. */
4499 if (n->type == WATCH_TYPE_META)
4504 subj = smk_of_task(smack_cred(cred));
4505 obj = smk_of_task(smack_cred(w_cred));
4507 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION);
4508 rc = smk_access(subj, obj, MAY_WRITE, &ad);
4509 rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc);
4512 #endif /* CONFIG_WATCH_QUEUE */
4517 * Audit requires a unique representation of each Smack specific
4518 * rule. This unique representation is used to distinguish the
4519 * object to be audited from remaining kernel objects and also
4520 * works as a glue between the audit hooks.
4522 * Since repository entries are added but never deleted, we'll use
4523 * the smack_known label address related to the given audit rule as
4524 * the needed unique representation. This also better fits the smack
4525 * model where nearly everything is a label.
4530 * smack_audit_rule_init - Initialize a smack audit rule
4531 * @field: audit rule fields given from user-space (audit.h)
4532 * @op: required testing operator (=, !=, >, <, ...)
4533 * @rulestr: smack label to be audited
4534 * @vrule: pointer to save our own audit rule representation
4536 * Prepare to audit cases where (@field @op @rulestr) is true.
4537 * The label to be audited is created if necessay.
4539 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
4541 struct smack_known *skp;
4542 char **rule = (char **)vrule;
4545 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4548 if (op != Audit_equal && op != Audit_not_equal)
4551 skp = smk_import_entry(rulestr, 0);
4553 return PTR_ERR(skp);
4555 *rule = skp->smk_known;
4561 * smack_audit_rule_known - Distinguish Smack audit rules
4562 * @krule: rule of interest, in Audit kernel representation format
4564 * This is used to filter Smack rules from remaining Audit ones.
4565 * If it's proved that this rule belongs to us, the
4566 * audit_rule_match hook will be called to do the final judgement.
4568 static int smack_audit_rule_known(struct audit_krule *krule)
4570 struct audit_field *f;
4573 for (i = 0; i < krule->field_count; i++) {
4574 f = &krule->fields[i];
4576 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
4584 * smack_audit_rule_match - Audit given object ?
4585 * @secid: security id for identifying the object to test
4586 * @field: audit rule flags given from user-space
4587 * @op: required testing operator
4588 * @vrule: smack internal rule presentation
4590 * The core Audit hook. It's used to take the decision of
4591 * whether to audit or not to audit a given object.
4593 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule)
4595 struct smack_known *skp;
4598 if (unlikely(!rule)) {
4599 WARN_ONCE(1, "Smack: missing rule\n");
4603 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
4606 skp = smack_from_secid(secid);
4609 * No need to do string comparisons. If a match occurs,
4610 * both pointers will point to the same smack_known
4613 if (op == Audit_equal)
4614 return (rule == skp->smk_known);
4615 if (op == Audit_not_equal)
4616 return (rule != skp->smk_known);
4622 * There is no need for a smack_audit_rule_free hook.
4623 * No memory was allocated.
4626 #endif /* CONFIG_AUDIT */
4629 * smack_ismaclabel - check if xattr @name references a smack MAC label
4630 * @name: Full xattr name to check.
4632 static int smack_ismaclabel(const char *name)
4634 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
4639 * smack_secid_to_secctx - return the smack label for a secid
4640 * @secid: incoming integer
4641 * @secdata: destination
4642 * @seclen: how long it is
4644 * Exists for networking code.
4646 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
4648 struct smack_known *skp = smack_from_secid(secid);
4651 *secdata = skp->smk_known;
4652 *seclen = strlen(skp->smk_known);
4657 * smack_secctx_to_secid - return the secid for a smack label
4658 * @secdata: smack label
4659 * @seclen: how long result is
4660 * @secid: outgoing integer
4662 * Exists for audit and networking code.
4664 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
4666 struct smack_known *skp = smk_find_entry(secdata);
4669 *secid = skp->smk_secid;
4676 * There used to be a smack_release_secctx hook
4677 * that did nothing back when hooks were in a vector.
4678 * Now that there's a list such a hook adds cost.
4681 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
4683 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx,
4687 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
4689 return __vfs_setxattr_noperm(&nop_mnt_idmap, dentry, XATTR_NAME_SMACK,
4693 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
4695 struct smack_known *skp = smk_of_inode(inode);
4697 *ctx = skp->smk_known;
4698 *ctxlen = strlen(skp->smk_known);
4702 static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
4705 struct task_smack *tsp;
4706 struct smack_known *skp;
4707 struct inode_smack *isp;
4708 struct cred *new_creds = *new;
4710 if (new_creds == NULL) {
4711 new_creds = prepare_creds();
4712 if (new_creds == NULL)
4716 tsp = smack_cred(new_creds);
4719 * Get label from overlay inode and set it in create_sid
4721 isp = smack_inode(d_inode(dentry));
4722 skp = isp->smk_inode;
4723 tsp->smk_task = skp;
4728 static int smack_inode_copy_up_xattr(const char *name)
4731 * Return 1 if this is the smack access Smack attribute.
4733 if (strcmp(name, XATTR_NAME_SMACK) == 0)
4739 static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
4741 const struct cred *old,
4744 struct task_smack *otsp = smack_cred(old);
4745 struct task_smack *ntsp = smack_cred(new);
4746 struct inode_smack *isp;
4750 * Use the process credential unless all of
4751 * the transmuting criteria are met
4753 ntsp->smk_task = otsp->smk_task;
4756 * the attribute of the containing directory
4758 isp = smack_inode(d_inode(dentry->d_parent));
4760 if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
4762 may = smk_access_entry(otsp->smk_task->smk_known,
4763 isp->smk_inode->smk_known,
4764 &otsp->smk_task->smk_rules);
4768 * If the directory is transmuting and the rule
4769 * providing access is transmuting use the containing
4770 * directory label instead of the process label.
4772 if (may > 0 && (may & MAY_TRANSMUTE))
4773 ntsp->smk_task = isp->smk_inode;
4778 #ifdef CONFIG_IO_URING
4780 * smack_uring_override_creds - Is io_uring cred override allowed?
4781 * @new: the target creds
4783 * Check to see if the current task is allowed to override it's credentials
4784 * to service an io_uring operation.
4786 static int smack_uring_override_creds(const struct cred *new)
4788 struct task_smack *tsp = smack_cred(current_cred());
4789 struct task_smack *nsp = smack_cred(new);
4792 * Allow the degenerate case where the new Smack value is
4793 * the same as the current Smack value.
4795 if (tsp->smk_task == nsp->smk_task)
4798 if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred()))
4805 * smack_uring_sqpoll - check if a io_uring polling thread can be created
4807 * Check to see if the current task is allowed to create a new io_uring
4808 * kernel polling thread.
4810 static int smack_uring_sqpoll(void)
4812 if (smack_privileged_cred(CAP_MAC_ADMIN, current_cred()))
4819 * smack_uring_cmd - check on file operations for io_uring
4820 * @ioucmd: the command in question
4822 * Make a best guess about whether a io_uring "command" should
4823 * be allowed. Use the same logic used for determining if the
4824 * file could be opened for read in the absence of better criteria.
4826 static int smack_uring_cmd(struct io_uring_cmd *ioucmd)
4828 struct file *file = ioucmd->file;
4829 struct smk_audit_info ad;
4830 struct task_smack *tsp;
4831 struct inode *inode;
4837 tsp = smack_cred(file->f_cred);
4838 inode = file_inode(file);
4840 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
4841 smk_ad_setfield_u_fs_path(&ad, file->f_path);
4842 rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
4843 rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc);
4848 #endif /* CONFIG_IO_URING */
4850 struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
4851 .lbs_cred = sizeof(struct task_smack),
4852 .lbs_file = sizeof(struct smack_known *),
4853 .lbs_inode = sizeof(struct inode_smack),
4854 .lbs_ipc = sizeof(struct smack_known *),
4855 .lbs_msg_msg = sizeof(struct smack_known *),
4856 .lbs_superblock = sizeof(struct superblock_smack),
4859 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
4860 LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
4861 LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
4862 LSM_HOOK_INIT(syslog, smack_syslog),
4864 LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup),
4865 LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param),
4867 LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
4868 LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts),
4869 LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts),
4870 LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
4871 LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
4873 LSM_HOOK_INIT(bprm_creds_for_exec, smack_bprm_creds_for_exec),
4875 LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
4876 LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
4877 LSM_HOOK_INIT(inode_link, smack_inode_link),
4878 LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
4879 LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir),
4880 LSM_HOOK_INIT(inode_rename, smack_inode_rename),
4881 LSM_HOOK_INIT(inode_permission, smack_inode_permission),
4882 LSM_HOOK_INIT(inode_setattr, smack_inode_setattr),
4883 LSM_HOOK_INIT(inode_getattr, smack_inode_getattr),
4884 LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr),
4885 LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr),
4886 LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr),
4887 LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr),
4888 LSM_HOOK_INIT(inode_set_acl, smack_inode_set_acl),
4889 LSM_HOOK_INIT(inode_get_acl, smack_inode_get_acl),
4890 LSM_HOOK_INIT(inode_remove_acl, smack_inode_remove_acl),
4891 LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity),
4892 LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity),
4893 LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity),
4894 LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
4896 LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
4897 LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
4898 LSM_HOOK_INIT(file_lock, smack_file_lock),
4899 LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
4900 LSM_HOOK_INIT(mmap_file, smack_mmap_file),
4901 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
4902 LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner),
4903 LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask),
4904 LSM_HOOK_INIT(file_receive, smack_file_receive),
4906 LSM_HOOK_INIT(file_open, smack_file_open),
4908 LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank),
4909 LSM_HOOK_INIT(cred_free, smack_cred_free),
4910 LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
4911 LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
4912 LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid),
4913 LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
4914 LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
4915 LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),
4916 LSM_HOOK_INIT(task_getpgid, smack_task_getpgid),
4917 LSM_HOOK_INIT(task_getsid, smack_task_getsid),
4918 LSM_HOOK_INIT(current_getsecid_subj, smack_current_getsecid_subj),
4919 LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj),
4920 LSM_HOOK_INIT(task_setnice, smack_task_setnice),
4921 LSM_HOOK_INIT(task_setioprio, smack_task_setioprio),
4922 LSM_HOOK_INIT(task_getioprio, smack_task_getioprio),
4923 LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler),
4924 LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler),
4925 LSM_HOOK_INIT(task_movememory, smack_task_movememory),
4926 LSM_HOOK_INIT(task_kill, smack_task_kill),
4927 LSM_HOOK_INIT(task_to_inode, smack_task_to_inode),
4929 LSM_HOOK_INIT(ipc_permission, smack_ipc_permission),
4930 LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
4932 LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
4934 LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security),
4935 LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
4936 LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
4937 LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
4938 LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
4940 LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security),
4941 LSM_HOOK_INIT(shm_associate, smack_shm_associate),
4942 LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
4943 LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
4945 LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security),
4946 LSM_HOOK_INIT(sem_associate, smack_sem_associate),
4947 LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
4948 LSM_HOOK_INIT(sem_semop, smack_sem_semop),
4950 LSM_HOOK_INIT(d_instantiate, smack_d_instantiate),
4952 LSM_HOOK_INIT(getprocattr, smack_getprocattr),
4953 LSM_HOOK_INIT(setprocattr, smack_setprocattr),
4955 LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect),
4956 LSM_HOOK_INIT(unix_may_send, smack_unix_may_send),
4958 LSM_HOOK_INIT(socket_post_create, smack_socket_post_create),
4959 LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair),
4960 #ifdef SMACK_IPV6_PORT_LABELING
4961 LSM_HOOK_INIT(socket_bind, smack_socket_bind),
4963 LSM_HOOK_INIT(socket_connect, smack_socket_connect),
4964 LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg),
4965 LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb),
4966 LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
4967 LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
4968 LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
4969 LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
4970 LSM_HOOK_INIT(sk_clone_security, smack_sk_clone_security),
4971 LSM_HOOK_INIT(sock_graft, smack_sock_graft),
4972 LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
4973 LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
4975 /* key management security hooks */
4977 LSM_HOOK_INIT(key_alloc, smack_key_alloc),
4978 LSM_HOOK_INIT(key_free, smack_key_free),
4979 LSM_HOOK_INIT(key_permission, smack_key_permission),
4980 LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity),
4981 #ifdef CONFIG_KEY_NOTIFICATIONS
4982 LSM_HOOK_INIT(watch_key, smack_watch_key),
4984 #endif /* CONFIG_KEYS */
4986 #ifdef CONFIG_WATCH_QUEUE
4987 LSM_HOOK_INIT(post_notification, smack_post_notification),
4992 LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init),
4993 LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known),
4994 LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match),
4995 #endif /* CONFIG_AUDIT */
4997 LSM_HOOK_INIT(ismaclabel, smack_ismaclabel),
4998 LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
4999 LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
5000 LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
5001 LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
5002 LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
5003 LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up),
5004 LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr),
5005 LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as),
5006 #ifdef CONFIG_IO_URING
5007 LSM_HOOK_INIT(uring_override_creds, smack_uring_override_creds),
5008 LSM_HOOK_INIT(uring_sqpoll, smack_uring_sqpoll),
5009 LSM_HOOK_INIT(uring_cmd, smack_uring_cmd),
5014 static __init void init_smack_known_list(void)
5017 * Initialize rule list locks
5019 mutex_init(&smack_known_huh.smk_rules_lock);
5020 mutex_init(&smack_known_hat.smk_rules_lock);
5021 mutex_init(&smack_known_floor.smk_rules_lock);
5022 mutex_init(&smack_known_star.smk_rules_lock);
5023 mutex_init(&smack_known_web.smk_rules_lock);
5025 * Initialize rule lists
5027 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
5028 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
5029 INIT_LIST_HEAD(&smack_known_star.smk_rules);
5030 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
5031 INIT_LIST_HEAD(&smack_known_web.smk_rules);
5033 * Create the known labels list
5035 smk_insert_entry(&smack_known_huh);
5036 smk_insert_entry(&smack_known_hat);
5037 smk_insert_entry(&smack_known_star);
5038 smk_insert_entry(&smack_known_floor);
5039 smk_insert_entry(&smack_known_web);
5043 * smack_init - initialize the smack system
5045 * Returns 0 on success, -ENOMEM is there's no memory
5047 static __init int smack_init(void)
5049 struct cred *cred = (struct cred *) current->cred;
5050 struct task_smack *tsp;
5052 smack_rule_cache = KMEM_CACHE(smack_rule, 0);
5053 if (!smack_rule_cache)
5057 * Set the security state for the initial task.
5059 tsp = smack_cred(cred);
5060 init_task_smack(tsp, &smack_known_floor, &smack_known_floor);
5065 security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
5068 pr_info("Smack: Initializing.\n");
5069 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
5070 pr_info("Smack: Netfilter enabled.\n");
5072 #ifdef SMACK_IPV6_PORT_LABELING
5073 pr_info("Smack: IPv6 port labeling enabled.\n");
5075 #ifdef SMACK_IPV6_SECMARK_LABELING
5076 pr_info("Smack: IPv6 Netfilter enabled.\n");
5079 /* initialize the smack_known_list */
5080 init_smack_known_list();
5086 * Smack requires early initialization in order to label
5087 * all processes and objects when they are created.
5089 DEFINE_LSM(smack) = {
5091 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
5092 .blobs = &smack_blob_sizes,