security.c 42.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6
/*
 * Security plug functions
 *
 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
7
 * Copyright (C) 2016 Mellanox Technologies
Linus Torvalds's avatar
Linus Torvalds committed
8 9 10 11 12 13 14
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 */

15
#include <linux/capability.h>
16
#include <linux/dcache.h>
Linus Torvalds's avatar
Linus Torvalds committed
17 18 19
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
Casey Schaufler's avatar
Casey Schaufler committed
20
#include <linux/lsm_hooks.h>
21
#include <linux/integrity.h>
22
#include <linux/ima.h>
23
#include <linux/evm.h>
Al Viro's avatar
Al Viro committed
24
#include <linux/fsnotify.h>
25 26 27
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/personality.h>
Paul Mundt's avatar
Paul Mundt committed
28
#include <linux/backing-dev.h>
29
#include <linux/string.h>
Al Viro's avatar
Al Viro committed
30
#include <net/flow.h>
Linus Torvalds's avatar
Linus Torvalds committed
31

32
#define MAX_LSM_EVM_XATTR	2
Linus Torvalds's avatar
Linus Torvalds committed
33

34 35 36
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX	10

37
struct security_hook_heads security_hook_heads __lsm_ro_after_init;
38 39
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);

40
char *lsm_names;
41
/* Boot-time LSM user choice */
42 43
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
	CONFIG_DEFAULT_SECURITY;
Linus Torvalds's avatar
Linus Torvalds committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

static void __init do_security_initcalls(void)
{
	initcall_t *call;
	call = __security_initcall_start;
	while (call < __security_initcall_end) {
		(*call) ();
		call++;
	}
}

/**
 * security_init - initializes the security framework
 *
 * This should be called early in the kernel initialization sequence.
 */
int __init security_init(void)
{
62 63 64 65 66 67
	int i;
	struct list_head *list = (struct list_head *) &security_hook_heads;

	for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
	     i++)
		INIT_LIST_HEAD(&list[i]);
68
	pr_info("Security Framework initialized\n");
Linus Torvalds's avatar
Linus Torvalds committed
69

70
	/*
71
	 * Load minor LSMs, with the capability module always first.
72 73 74
	 */
	capability_add_hooks();
	yama_add_hooks();
75
	loadpin_add_hooks();
76

77
	/*
78
	 * Load all the remaining security modules.
79
	 */
Linus Torvalds's avatar
Linus Torvalds committed
80 81 82 83 84
	do_security_initcalls();

	return 0;
}

85 86 87 88 89 90 91 92
/* Save user chosen LSM */
static int __init choose_lsm(char *str)
{
	strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
	return 1;
}
__setup("security=", choose_lsm);

93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
static bool match_last_lsm(const char *list, const char *lsm)
{
	const char *last;

	if (WARN_ON(!list || !lsm))
		return false;
	last = strrchr(list, ',');
	if (last)
		/* Pass the comma, strcmp() will check for '\0' */
		last++;
	else
		last = list;
	return !strcmp(last, lsm);
}

108 109 110 111 112 113 114
static int lsm_append(char *new, char **result)
{
	char *cp;

	if (*result == NULL) {
		*result = kstrdup(new, GFP_KERNEL);
	} else {
115 116 117
		/* Check if it is the last registered name */
		if (match_last_lsm(*result, new))
			return 0;
118 119 120 121 122 123 124 125 126
		cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
		if (cp == NULL)
			return -ENOMEM;
		kfree(*result);
		*result = cp;
	}
	return 0;
}

127 128
/**
 * security_module_enable - Load given security module on boot ?
129
 * @module: the name of the module
130 131 132
 *
 * Each LSM must pass this method before registering its own operations
 * to avoid security registration races. This method may also be used
133
 * to check if your LSM is currently loaded during kernel initialization.
134
 *
135 136 137 138 139 140 141 142
 * Returns:
 *
 * true if:
 *
 * - The passed LSM is the one chosen by user at boot time,
 * - or the passed LSM is configured as the default and the user did not
 *   choose an alternate LSM at boot time.
 *
143 144
 * Otherwise, return false.
 */
145
int __init security_module_enable(const char *module)
146
{
147
	return !strcmp(module, chosen_lsm);
148 149
}

150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
/**
 * security_add_hooks - Add a modules hooks to the hook lists.
 * @hooks: the hooks to add
 * @count: the number of hooks to add
 * @lsm: the name of the security module
 *
 * Each LSM has to register its hooks with the infrastructure.
 */
void __init security_add_hooks(struct security_hook_list *hooks, int count,
				char *lsm)
{
	int i;

	for (i = 0; i < count; i++) {
		hooks[i].lsm = lsm;
		list_add_tail_rcu(&hooks[i].list, hooks[i].head);
	}
	if (lsm_append(lsm, &lsm_names) < 0)
		panic("%s - Cannot get early memory.\n", __func__);
}

171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188
int call_lsm_notifier(enum lsm_event event, void *data)
{
	return atomic_notifier_call_chain(&lsm_notifier_chain, event, data);
}
EXPORT_SYMBOL(call_lsm_notifier);

int register_lsm_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&lsm_notifier_chain, nb);
}
EXPORT_SYMBOL(register_lsm_notifier);

int unregister_lsm_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&lsm_notifier_chain, nb);
}
EXPORT_SYMBOL(unregister_lsm_notifier);

189
/*
190
 * Hook list operation macros.
Linus Torvalds's avatar
Linus Torvalds committed
191
 *
192 193
 * call_void_hook:
 *	This is a hook that does not return a value.
Linus Torvalds's avatar
Linus Torvalds committed
194
 *
195 196
 * call_int_hook:
 *	This is a hook that returns a value.
Linus Torvalds's avatar
Linus Torvalds committed
197 198
 */

199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
#define call_void_hook(FUNC, ...)				\
	do {							\
		struct security_hook_list *P;			\
								\
		list_for_each_entry(P, &security_hook_heads.FUNC, list)	\
			P->hook.FUNC(__VA_ARGS__);		\
	} while (0)

#define call_int_hook(FUNC, IRC, ...) ({			\
	int RC = IRC;						\
	do {							\
		struct security_hook_list *P;			\
								\
		list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
			RC = P->hook.FUNC(__VA_ARGS__);		\
			if (RC != 0)				\
				break;				\
		}						\
	} while (0);						\
	RC;							\
})
Linus Torvalds's avatar
Linus Torvalds committed
220

221 222
/* Security operations */

223 224
int security_binder_set_context_mgr(struct task_struct *mgr)
{
225
	return call_int_hook(binder_set_context_mgr, 0, mgr);
226 227 228 229 230
}

int security_binder_transaction(struct task_struct *from,
				struct task_struct *to)
{
231
	return call_int_hook(binder_transaction, 0, from, to);
232 233 234 235 236
}

int security_binder_transfer_binder(struct task_struct *from,
				    struct task_struct *to)
{
237
	return call_int_hook(binder_transfer_binder, 0, from, to);
238 239 240 241 242
}

int security_binder_transfer_file(struct task_struct *from,
				  struct task_struct *to, struct file *file)
{
243
	return call_int_hook(binder_transfer_file, 0, from, to, file);
244 245
}

246
int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
247
{
248
	return call_int_hook(ptrace_access_check, 0, child, mode);
249 250 251 252
}

int security_ptrace_traceme(struct task_struct *parent)
{
253
	return call_int_hook(ptrace_traceme, 0, parent);
254 255 256 257 258 259 260
}

int security_capget(struct task_struct *target,
		     kernel_cap_t *effective,
		     kernel_cap_t *inheritable,
		     kernel_cap_t *permitted)
{
261 262
	return call_int_hook(capget, 0, target,
				effective, inheritable, permitted);
263 264
}

265 266 267 268
int security_capset(struct cred *new, const struct cred *old,
		    const kernel_cap_t *effective,
		    const kernel_cap_t *inheritable,
		    const kernel_cap_t *permitted)
269
{
270 271
	return call_int_hook(capset, 0, new, old,
				effective, inheritable, permitted);
272 273
}

274
int security_capable(const struct cred *cred, struct user_namespace *ns,
275
		     int cap)
276
{
277
	return call_int_hook(capable, 0, cred, ns, cap, SECURITY_CAP_AUDIT);
278 279
}

280 281
int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
			     int cap)
282
{
283
	return call_int_hook(capable, 0, cred, ns, cap, SECURITY_CAP_NOAUDIT);
284 285 286 287
}

int security_quotactl(int cmds, int type, int id, struct super_block *sb)
{
288
	return call_int_hook(quotactl, 0, cmds, type, id, sb);
289 290 291 292
}

int security_quota_on(struct dentry *dentry)
{
293
	return call_int_hook(quota_on, 0, dentry);
294 295
}

296
int security_syslog(int type)
297
{
298
	return call_int_hook(syslog, 0, type);
299 300
}

301
int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
302
{
303
	return call_int_hook(settime, 0, ts, tz);
304 305 306 307
}

int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
{
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
	struct security_hook_list *hp;
	int cap_sys_admin = 1;
	int rc;

	/*
	 * The module will respond with a positive value if
	 * it thinks the __vm_enough_memory() call should be
	 * made with the cap_sys_admin set. If all of the modules
	 * agree that it should be set it will. If any module
	 * thinks it should not be set it won't.
	 */
	list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
		rc = hp->hook.vm_enough_memory(mm, pages);
		if (rc <= 0) {
			cap_sys_admin = 0;
			break;
		}
	}
	return __vm_enough_memory(mm, pages, cap_sys_admin);
327 328
}

329
int security_bprm_set_creds(struct linux_binprm *bprm)
330
{
331
	return call_int_hook(bprm_set_creds, 0, bprm);
332 333
}

334
int security_bprm_check(struct linux_binprm *bprm)
335
{
336 337
	int ret;

338
	ret = call_int_hook(bprm_check_security, 0, bprm);
339 340 341
	if (ret)
		return ret;
	return ima_bprm_check(bprm);
342 343
}

344
void security_bprm_committing_creds(struct linux_binprm *bprm)
345
{
346
	call_void_hook(bprm_committing_creds, bprm);
347 348
}

349
void security_bprm_committed_creds(struct linux_binprm *bprm)
350
{
351
	call_void_hook(bprm_committed_creds, bprm);
352 353 354 355
}

int security_bprm_secureexec(struct linux_binprm *bprm)
{
356
	return call_int_hook(bprm_secureexec, 0, bprm);
357 358 359 360
}

int security_sb_alloc(struct super_block *sb)
{
361
	return call_int_hook(sb_alloc_security, 0, sb);
362 363 364 365
}

void security_sb_free(struct super_block *sb)
{
366
	call_void_hook(sb_free_security, sb);
367 368
}

369
int security_sb_copy_data(char *orig, char *copy)
370
{
371
	return call_int_hook(sb_copy_data, 0, orig, copy);
372
}
373
EXPORT_SYMBOL(security_sb_copy_data);
374

375 376
int security_sb_remount(struct super_block *sb, void *data)
{
377
	return call_int_hook(sb_remount, 0, sb, data);
378 379
}

380
int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
381
{
382
	return call_int_hook(sb_kern_mount, 0, sb, flags, data);
383 384
}

385 386
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
{
387
	return call_int_hook(sb_show_options, 0, m, sb);
388 389
}

390 391
int security_sb_statfs(struct dentry *dentry)
{
392
	return call_int_hook(sb_statfs, 0, dentry);
393 394
}

Al Viro's avatar
Al Viro committed
395
int security_sb_mount(const char *dev_name, const struct path *path,
Al Viro's avatar
Al Viro committed
396
                       const char *type, unsigned long flags, void *data)
397
{
398
	return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
399 400 401 402
}

int security_sb_umount(struct vfsmount *mnt, int flags)
{
403
	return call_int_hook(sb_umount, 0, mnt, flags);
404 405
}

Al Viro's avatar
Al Viro committed
406
int security_sb_pivotroot(const struct path *old_path, const struct path *new_path)
407
{
408
	return call_int_hook(sb_pivotroot, 0, old_path, new_path);
409 410
}

411
int security_sb_set_mnt_opts(struct super_block *sb,
412 413 414
				struct security_mnt_opts *opts,
				unsigned long kern_flags,
				unsigned long *set_kern_flags)
415
{
416 417 418
	return call_int_hook(sb_set_mnt_opts,
				opts->num_mnt_opts ? -EOPNOTSUPP : 0, sb,
				opts, kern_flags, set_kern_flags);
419
}
420
EXPORT_SYMBOL(security_sb_set_mnt_opts);
421

422
int security_sb_clone_mnt_opts(const struct super_block *oldsb,
423 424
				struct super_block *newsb)
{
425
	return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb);
426
}
427 428 429 430
EXPORT_SYMBOL(security_sb_clone_mnt_opts);

int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
{
431
	return call_int_hook(sb_parse_opts_str, 0, options, opts);
432 433
}
EXPORT_SYMBOL(security_sb_parse_opts_str);
434

435 436 437
int security_inode_alloc(struct inode *inode)
{
	inode->i_security = NULL;
438
	return call_int_hook(inode_alloc_security, 0, inode);
439 440 441 442
}

void security_inode_free(struct inode *inode)
{
443
	integrity_inode_free(inode);
444
	call_void_hook(inode_free_security, inode);
445 446
}

447
int security_dentry_init_security(struct dentry *dentry, int mode,
448
					const struct qstr *name, void **ctx,
449 450
					u32 *ctxlen)
{
451 452
	return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,
				name, ctx, ctxlen);
453 454 455
}
EXPORT_SYMBOL(security_dentry_init_security);

456 457 458 459 460 461 462 463 464
int security_dentry_create_files_as(struct dentry *dentry, int mode,
				    struct qstr *name,
				    const struct cred *old, struct cred *new)
{
	return call_int_hook(dentry_create_files_as, 0, dentry, mode,
				name, old, new);
}
EXPORT_SYMBOL(security_dentry_create_files_as);

465
int security_inode_init_security(struct inode *inode, struct inode *dir,
466 467
				 const struct qstr *qstr,
				 const initxattrs initxattrs, void *fs_data)
468
{
469 470
	struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
	struct xattr *lsm_xattr, *evm_xattr, *xattr;
471 472
	int ret;

473
	if (unlikely(IS_PRIVATE(inode)))
474
		return 0;
475 476

	if (!initxattrs)
477 478
		return call_int_hook(inode_init_security, -EOPNOTSUPP, inode,
				     dir, qstr, NULL, NULL, NULL);
479
	memset(new_xattrs, 0, sizeof(new_xattrs));
480
	lsm_xattr = new_xattrs;
481
	ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr,
482 483 484 485 486
						&lsm_xattr->name,
						&lsm_xattr->value,
						&lsm_xattr->value_len);
	if (ret)
		goto out;
487 488 489 490 491

	evm_xattr = lsm_xattr + 1;
	ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
	if (ret)
		goto out;
492 493
	ret = initxattrs(inode, new_xattrs, fs_data);
out:
494
	for (xattr = new_xattrs; xattr->value != NULL; xattr++)
495
		kfree(xattr->value);
496 497 498 499 500
	return (ret == -EOPNOTSUPP) ? 0 : ret;
}
EXPORT_SYMBOL(security_inode_init_security);

int security_old_inode_init_security(struct inode *inode, struct inode *dir,
501
				     const struct qstr *qstr, const char **name,
502
				     void **value, size_t *len)
503 504
{
	if (unlikely(IS_PRIVATE(inode)))
505
		return -EOPNOTSUPP;
506 507
	return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir,
			     qstr, name, value, len);
508
}
509
EXPORT_SYMBOL(security_old_inode_init_security);
510

511
#ifdef CONFIG_SECURITY_PATH
512
int security_path_mknod(const struct path *dir, struct dentry *dentry, umode_t mode,
513 514
			unsigned int dev)
{
515
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
516
		return 0;
517
	return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
518 519 520
}
EXPORT_SYMBOL(security_path_mknod);

521
int security_path_mkdir(const struct path *dir, struct dentry *dentry, umode_t mode)
522
{
523
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
524
		return 0;
525
	return call_int_hook(path_mkdir, 0, dir, dentry, mode);
526
}
527
EXPORT_SYMBOL(security_path_mkdir);
528

529
int security_path_rmdir(const struct path *dir, struct dentry *dentry)
530
{
531
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
532
		return 0;
533
	return call_int_hook(path_rmdir, 0, dir, dentry);
534 535
}

536
int security_path_unlink(const struct path *dir, struct dentry *dentry)
537
{
538
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
539
		return 0;
540
	return call_int_hook(path_unlink, 0, dir, dentry);
541
}
542
EXPORT_SYMBOL(security_path_unlink);
543

544
int security_path_symlink(const struct path *dir, struct dentry *dentry,
545 546
			  const char *old_name)
{
547
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
548
		return 0;
549
	return call_int_hook(path_symlink, 0, dir, dentry, old_name);
550 551
}

552
int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
553 554
		       struct dentry *new_dentry)
{
555
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
556
		return 0;
557
	return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
558 559
}

560 561
int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
			 const struct path *new_dir, struct dentry *new_dentry,
562
			 unsigned int flags)
563
{
564 565
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
		     (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
566
		return 0;
Miklos Szeredi's avatar
Miklos Szeredi committed
567 568

	if (flags & RENAME_EXCHANGE) {
569 570
		int err = call_int_hook(path_rename, 0, new_dir, new_dentry,
					old_dir, old_dentry);
Miklos Szeredi's avatar
Miklos Szeredi committed
571 572 573 574
		if (err)
			return err;
	}

575 576
	return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
				new_dentry);
577
}
578
EXPORT_SYMBOL(security_path_rename);
579

Al Viro's avatar
Al Viro committed
580
int security_path_truncate(const struct path *path)
581
{
582
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
583
		return 0;
584
	return call_int_hook(path_truncate, 0, path);
585
}
586

587
int security_path_chmod(const struct path *path, umode_t mode)
588
{
589
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
590
		return 0;
591
	return call_int_hook(path_chmod, 0, path, mode);
592 593
}

594
int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
595
{
596
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
597
		return 0;
598
	return call_int_hook(path_chown, 0, path, uid, gid);
599
}
600

Al Viro's avatar
Al Viro committed
601
int security_path_chroot(const struct path *path)
602
{
603
	return call_int_hook(path_chroot, 0, path);
604
}
605 606
#endif

Al Viro's avatar
Al Viro committed
607
int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
608 609 610
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
611
	return call_int_hook(inode_create, 0, dir, dentry, mode);
612
}
613
EXPORT_SYMBOL_GPL(security_inode_create);
614 615 616 617

int security_inode_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *new_dentry)
{
618
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
619
		return 0;
620
	return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
621 622 623 624
}

int security_inode_unlink(struct inode *dir, struct dentry *dentry)
{
625
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
626
		return 0;
627
	return call_int_hook(inode_unlink, 0, dir, dentry);
628 629 630 631 632 633 634
}

int security_inode_symlink(struct inode *dir, struct dentry *dentry,
			    const char *old_name)
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
635
	return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
636 637
}

638
int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
639 640 641
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
642
	return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
643
}
644
EXPORT_SYMBOL_GPL(security_inode_mkdir);
645 646 647

int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
648
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
649
		return 0;
650
	return call_int_hook(inode_rmdir, 0, dir, dentry);
651 652
}

Al Viro's avatar
Al Viro committed
653
int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
654 655 656
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
657
	return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
658 659 660
}

int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
661 662
			   struct inode *new_dir, struct dentry *new_dentry,
			   unsigned int flags)
663
{
664 665
        if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
            (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
666
		return 0;
Miklos Szeredi's avatar
Miklos Szeredi committed
667 668

	if (flags & RENAME_EXCHANGE) {
669
		int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
Miklos Szeredi's avatar
Miklos Szeredi committed
670 671 672 673 674
						     old_dir, old_dentry);
		if (err)
			return err;
	}

675
	return call_int_hook(inode_rename, 0, old_dir, old_dentry,
676 677 678 679 680
					   new_dir, new_dentry);
}

int security_inode_readlink(struct dentry *dentry)
{
681
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
682
		return 0;
683
	return call_int_hook(inode_readlink, 0, dentry);
684 685
}

686 687
int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
			       bool rcu)
688
{
689
	if (unlikely(IS_PRIVATE(inode)))
690
		return 0;
691
	return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
692 693
}

694
int security_inode_permission(struct inode *inode, int mask)
695 696 697
{
	if (unlikely(IS_PRIVATE(inode)))
		return 0;
698
	return call_int_hook(inode_permission, 0, inode, mask);
699 700 701 702
}

int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
{
703 704
	int ret;

705
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
706
		return 0;
707
	ret = call_int_hook(inode_setattr, 0, dentry, attr);
708 709 710
	if (ret)
		return ret;
	return evm_inode_setattr(dentry, attr);
711
}
712
EXPORT_SYMBOL_GPL(security_inode_setattr);
713

714
int security_inode_getattr(const struct path *path)
715
{
716
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
717
		return 0;
718
	return call_int_hook(inode_getattr, 0, path);
719 720
}

721 722
int security_inode_setxattr(struct dentry *dentry, const char *name,
			    const void *value, size_t size, int flags)
723
{
724 725
	int ret;

726
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
727
		return 0;
728 729 730 731 732
	/*
	 * SELinux and Smack integrate the cap call,
	 * so assume that all LSMs supplying this call do so.
	 */
	ret = call_int_hook(inode_setxattr, 1, dentry, name, value, size,
733
				flags);
734 735 736

	if (ret == 1)
		ret = cap_inode_setxattr(dentry, name, value, size, flags);
737 738 739
	if (ret)
		return ret;
	ret = ima_inode_setxattr(dentry, name, value, size);
740 741 742
	if (ret)
		return ret;
	return evm_inode_setxattr(dentry, name, value, size);
743 744
}

745 746
void security_inode_post_setxattr(struct dentry *dentry, const char *name,
				  const void *value, size_t size, int flags)
747
{
748
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
749
		return;
750
	call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
751
	evm_inode_post_setxattr(dentry, name, value, size);
752 753
}

754
int security_inode_getxattr(struct dentry *dentry, const char *name)
755
{
756
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
757
		return 0;
758
	return call_int_hook(inode_getxattr, 0, dentry, name);
759 760 761 762
}

int security_inode_listxattr(struct dentry *dentry)
{
763
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
764
		return 0;
765
	return call_int_hook(inode_listxattr, 0, dentry);
766 767
}

768
int security_inode_removexattr(struct dentry *dentry, const char *name)
769
{
770 771
	int ret;

772
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
773
		return 0;
774 775 776 777 778 779 780
	/*
	 * SELinux and Smack integrate the cap call,
	 * so assume that all LSMs supplying this call do so.
	 */
	ret = call_int_hook(inode_removexattr, 1, dentry, name);
	if (ret == 1)
		ret = cap_inode_removexattr(dentry, name);
781 782 783
	if (ret)
		return ret;
	ret = ima_inode_removexattr(dentry, name);
784 785 786
	if (ret)
		return ret;
	return evm_inode_removexattr(dentry, name);
787 788
}

789 790
int security_inode_need_killpriv(struct dentry *dentry)
{
791
	return call_int_hook(inode_need_killpriv, 0, dentry);
792 793 794 795
}

int security_inode_killpriv(struct dentry *dentry)
{
796
	return call_int_hook(inode_killpriv, 0, dentry);
797 798
}

799
int security_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc)
800
{
801 802 803
	struct security_hook_list *hp;
	int rc;

804
	if (unlikely(IS_PRIVATE(inode)))
805
		return -EOPNOTSUPP;
806 807 808 809 810 811 812 813 814
	/*
	 * Only one module will provide an attribute with a given name.
	 */
	list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
		rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
		if (rc != -EOPNOTSUPP)
			return rc;
	}
	return -EOPNOTSUPP;
815 816 817 818
}

int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
{
819 820 821
	struct security_hook_list *hp;
	int rc;

822
	if (unlikely(IS_PRIVATE(inode)))
823
		return -EOPNOTSUPP;
824 825 826 827 828 829 830 831 832 833
	/*
	 * Only one module will provide an attribute with a given name.
	 */
	list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
		rc = hp->hook.inode_setsecurity(inode, name, value, size,
								flags);
		if (rc != -EOPNOTSUPP)
			return rc;
	}
	return -EOPNOTSUPP;
834 835 836 837 838 839
}

int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
{
	if (unlikely(IS_PRIVATE(inode)))
		return 0;
840
	return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
841
}
842
EXPORT_SYMBOL(security_inode_listsecurity);
843

844
void security_inode_getsecid(struct inode *inode, u32 *secid)
845
{
846
	call_void_hook(inode_getsecid, inode, secid);
847 848
}

849 850 851 852 853 854
int security_inode_copy_up(struct dentry *src, struct cred **new)
{
	return call_int_hook(inode_copy_up, 0, src, new);
}
EXPORT_SYMBOL(security_inode_copy_up);

855 856 857 858 859 860
int security_inode_copy_up_xattr(const char *name)
{
	return call_int_hook(inode_copy_up_xattr, -EOPNOTSUPP, name);
}
EXPORT_SYMBOL(security_inode_copy_up_xattr);

861 862
int security_file_permission(struct file *file, int mask)
{
863 864
	int ret;

865
	ret = call_int_hook(file_permission, 0, file, mask);
866 867 868 869
	if (ret)
		return ret;

	return fsnotify_perm(file, mask);
870 871 872 873
}

int security_file_alloc(struct file *file)
{
874
	return call_int_hook(file_alloc_security, 0, file);
875 876 877 878
}

void security_file_free(struct file *file)
{
879
	call_void_hook(file_free_security, file);
880 881 882 883
}

int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
884
	return call_int_hook(file_ioctl, 0, file, cmd, arg);
885 886
}

887
static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
888
{
889
	/*
890 891
	 * Does we have PROT_READ and does the application expect
	 * it to imply PROT_EXEC?  If not, nothing to talk about...
892
	 */
893 894
	if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
		return prot;
895
	if (!(current->personality & READ_IMPLIES_EXEC))
896 897 898 899 900 901 902 903
		return prot;
	/*
	 * if that's an anonymous mapping, let it.
	 */
	if (!file)
		return prot | PROT_EXEC;
	/*
	 * ditto if it's not on noexec mount, except that on !MMU we need
904
	 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
905
	 */
906
	if (!path_noexec(&file->f_path)) {
907
#ifndef CONFIG_MMU
908 909 910 911 912
		if (file->f_op->mmap_capabilities) {
			unsigned caps = file->f_op->mmap_capabilities(file);
			if (!(caps & NOMMU_MAP_EXEC))
				return prot;
		}
913
#endif
914
		return prot | PROT_EXEC;
915
	}
916 917 918 919 920 921 922 923
	/* anything on noexec mount won't get PROT_EXEC */
	return prot;
}

int security_mmap_file(struct file *file, unsigned long prot,
			unsigned long flags)
{
	int ret;
924
	ret = call_int_hook(mmap_file, 0, file, prot,
925
					mmap_prot(file, prot), flags);
926 927 928
	if (ret)
		return ret;
	return ima_file_mmap(file, prot);
929 930
}

931 932
int security_mmap_addr(unsigned long addr)
{
933
	return call_int_hook(mmap_addr, 0, addr);
934 935
}

936 937 938
int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
			    unsigned long prot)
{
939
	return call_int_hook(file_mprotect, 0, vma, reqprot, prot);
940 941 942 943
}

int security_file_lock(struct file *file, unsigned int cmd)
{
944
	return call_int_hook(file_lock, 0, file, cmd);
945 946 947 948
}

int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
949
	return call_int_hook(file_fcntl, 0, file, cmd, arg);
950 951
}

952
void security_file_set_fowner(struct file *file)
953
{
954
	call_void_hook(file_set_fowner, file);
955 956 957 958 959
}

int security_file_send_sigiotask(struct task_struct *tsk,
				  struct fown_struct *fown, int sig)
{
960
	return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
961 962 963 964
}

int security_file_receive(struct file *file)
{
965
	return call_int_hook(file_receive, 0, file);
966 967
}