security/security.c

   1 /*
   2  * Security plug functions
   3  *
   4  * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   5  * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
   6  * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  */
  13
  14 #include <linux/capability.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/security.h>
  19 #include <linux/integrity.h>
  20 #include <linux/ima.h>
  21 #include <linux/evm.h>
  22 #include <linux/fsnotify.h>
  23 #include <linux/mman.h>
  24 #include <linux/mount.h>
  25 #include <linux/personality.h>
  26 #include <linux/backing-dev.h>
  27 #include <net/flow.h>
  28
  29 #define MAX_LSM_EVM_XATTR       2
  30
  31 /* Boot-time LSM user choice */
  32 static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
  33         CONFIG_DEFAULT_SECURITY;
  34
  35 static struct security_operations *security_ops;
  36 static struct security_operations default_security_ops = {
  37         .name   = "default",
  38 };
  39
  40 static inline int __init verify(struct security_operations *ops)
  41 {
  42         /* verify the security_operations structure exists */
  43         if (!ops)
  44                 return -EINVAL;
  45         security_fixup_ops(ops);
  46         return 0;
  47 }
  48
  49 static void __init do_security_initcalls(void)
  50 {
  51         initcall_t *call;
  52         call = __security_initcall_start;
  53         while (call < __security_initcall_end) {
  54                 (*call) ();
  55                 call++;
  56         }
  57 }
  58
  59 /**
  60  * security_init - initializes the security framework
  61  *
  62  * This should be called early in the kernel initialization sequence.
  63  */
  64 int __init security_init(void)
  65 {
  66         printk(KERN_INFO "Security Framework initialized\n");
  67
  68         security_fixup_ops(&default_security_ops);
  69         security_ops = &default_security_ops;
  70         do_security_initcalls();
  71
  72         return 0;
  73 }
  74
  75 void reset_security_ops(void)
  76 {
  77         security_ops = &default_security_ops;
  78 }
  79
  80 /* Save user chosen LSM */
  81 static int __init choose_lsm(char *str)
  82 {
  83         strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
  84         return 1;
  85 }
  86 __setup("security=", choose_lsm);
  87
  88 /**
  89  * security_module_enable - Load given security module on boot ?
  90  * @ops: a pointer to the struct security_operations that is to be checked.
  91  *
  92  * Each LSM must pass this method before registering its own operations
  93  * to avoid security registration races. This method may also be used
  94  * to check if your LSM is currently loaded during kernel initialization.
  95  *
  96  * Return true if:
  97  *      -The passed LSM is the one chosen by user at boot time,
  98  *      -or the passed LSM is configured as the default and the user did not
  99  *       choose an alternate LSM at boot time.
 100  * Otherwise, return false.
 101  */
 102 int __init security_module_enable(struct security_operations *ops)
 103 {
 104         return !strcmp(ops->name, chosen_lsm);
 105 }
 106
 107 /**
 108  * register_security - registers a security framework with the kernel
 109  * @ops: a pointer to the struct security_options that is to be registered
 110  *
 111  * This function allows a security module to register itself with the
 112  * kernel security subsystem.  Some rudimentary checking is done on the @ops
 113  * value passed to this function. You'll need to check first if your LSM
 114  * is allowed to register its @ops by calling security_module_enable(@ops).
 115  *
 116  * If there is already a security module registered with the kernel,
 117  * an error will be returned.  Otherwise %0 is returned on success.
 118  */
 119 int __init register_security(struct security_operations *ops)
 120 {
 121         if (verify(ops)) {
 122                 printk(KERN_DEBUG "%s could not verify "
 123                        "security_operations structure.\n", __func__);
 124                 return -EINVAL;
 125         }
 126
 127         if (security_ops != &default_security_ops)
 128                 return -EAGAIN;
 129
 130         security_ops = ops;
 131
 132         return 0;
 133 }
 134
 135 /* Security operations */
 136
 137 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
 138 {
 139 #ifdef CONFIG_SECURITY_YAMA_STACKED
 140         int rc;
 141         rc = yama_ptrace_access_check(child, mode);
 142         if (rc)
 143                 return rc;
 144 #endif
 145         return security_ops->ptrace_access_check(child, mode);
 146 }
 147
 148 int security_ptrace_traceme(struct task_struct *parent)
 149 {
 150 #ifdef CONFIG_SECURITY_YAMA_STACKED
 151         int rc;
 152         rc = yama_ptrace_traceme(parent);
 153         if (rc)
 154                 return rc;
 155 #endif
 156         return security_ops->ptrace_traceme(parent);
 157 }
 158
 159 int security_capget(struct task_struct *target,
 160                      kernel_cap_t *effective,
 161                      kernel_cap_t *inheritable,
 162                      kernel_cap_t *permitted)
 163 {
 164         return security_ops->capget(target, effective, inheritable, permitted);
 165 }
 166
 167 int security_capset(struct cred *new, const struct cred *old,
 168                     const kernel_cap_t *effective,
 169                     const kernel_cap_t *inheritable,
 170                     const kernel_cap_t *permitted)
 171 {
 172         return security_ops->capset(new, old,
 173                                     effective, inheritable, permitted);
 174 }
 175
 176 int security_capable(const struct cred *cred, struct user_namespace *ns,
 177                      int cap)
 178 {
 179         return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT);
 180 }
 181
 182 int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
 183                              int cap)
 184 {
 185         return security_ops->capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
 186 }
 187
 188 int security_quotactl(int cmds, int type, int id, struct super_block *sb)
 189 {
 190         return security_ops->quotactl(cmds, type, id, sb);
 191 }
 192
 193 int security_quota_on(struct dentry *dentry)
 194 {
 195         return security_ops->quota_on(dentry);
 196 }
 197
 198 int security_syslog(int type)
 199 {
 200         return security_ops->syslog(type);
 201 }
 202
 203 int security_settime(const struct timespec *ts, const struct timezone *tz)
 204 {
 205         return security_ops->settime(ts, tz);
 206 }
 207
 208 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
 209 {
 210         return security_ops->vm_enough_memory(mm, pages);
 211 }
 212
 213 int security_bprm_set_creds(struct linux_binprm *bprm)
 214 {
 215         return security_ops->bprm_set_creds(bprm);
 216 }
 217
 218 int security_bprm_check(struct linux_binprm *bprm)
 219 {
 220         int ret;
 221
 222         ret = security_ops->bprm_check_security(bprm);
 223         if (ret)
 224                 return ret;
 225         return ima_bprm_check(bprm);
 226 }
 227
 228 void security_bprm_committing_creds(struct linux_binprm *bprm)
 229 {
 230         security_ops->bprm_committing_creds(bprm);
 231 }
 232
 233 void security_bprm_committed_creds(struct linux_binprm *bprm)
 234 {
 235         security_ops->bprm_committed_creds(bprm);
 236 }
 237
 238 int security_bprm_secureexec(struct linux_binprm *bprm)
 239 {
 240         return security_ops->bprm_secureexec(bprm);
 241 }
 242
 243 int security_sb_alloc(struct super_block *sb)
 244 {
 245         return security_ops->sb_alloc_security(sb);
 246 }
 247
 248 void security_sb_free(struct super_block *sb)
 249 {
 250         security_ops->sb_free_security(sb);
 251 }
 252
 253 int security_sb_copy_data(char *orig, char *copy)
 254 {
 255         return security_ops->sb_copy_data(orig, copy);
 256 }
 257 EXPORT_SYMBOL(security_sb_copy_data);
 258
 259 int security_sb_remount(struct super_block *sb, void *data)
 260 {
 261         return security_ops->sb_remount(sb, data);
 262 }
 263
 264 int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
 265 {
 266         return security_ops->sb_kern_mount(sb, flags, data);
 267 }
 268
 269 int security_sb_show_options(struct seq_file *m, struct super_block *sb)
 270 {
 271         return security_ops->sb_show_options(m, sb);
 272 }
 273
 274 int security_sb_statfs(struct dentry *dentry)
 275 {
 276         return security_ops->sb_statfs(dentry);
 277 }
 278
 279 int security_sb_mount(char *dev_name, struct path *path,
 280                        char *type, unsigned long flags, void *data)
 281 {
 282         return security_ops->sb_mount(dev_name, path, type, flags, data);
 283 }
 284
 285 int security_sb_umount(struct vfsmount *mnt, int flags)
 286 {
 287         return security_ops->sb_umount(mnt, flags);
 288 }
 289
 290 int security_sb_pivotroot(struct path *old_path, struct path *new_path)
 291 {
 292         return security_ops->sb_pivotroot(old_path, new_path);
 293 }
 294
 295 int security_sb_set_mnt_opts(struct super_block *sb,
 296                                 struct security_mnt_opts *opts)
 297 {
 298         return security_ops->sb_set_mnt_opts(sb, opts);
 299 }
 300 EXPORT_SYMBOL(security_sb_set_mnt_opts);
 301
 302 void security_sb_clone_mnt_opts(const struct super_block *oldsb,
 303                                 struct super_block *newsb)
 304 {
 305         security_ops->sb_clone_mnt_opts(oldsb, newsb);
 306 }
 307 EXPORT_SYMBOL(security_sb_clone_mnt_opts);
 308
 309 int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
 310 {
 311         return security_ops->sb_parse_opts_str(options, opts);
 312 }
 313 EXPORT_SYMBOL(security_sb_parse_opts_str);
 314
 315 int security_inode_alloc(struct inode *inode)
 316 {
 317         inode->i_security = NULL;
 318         return security_ops->inode_alloc_security(inode);
 319 }
 320
 321 void security_inode_free(struct inode *inode)
 322 {
 323         integrity_inode_free(inode);
 324         security_ops->inode_free_security(inode);
 325 }
 326
 327 int security_inode_init_security(struct inode *inode, struct inode *dir,
 328                                  const struct qstr *qstr,
 329                                  const initxattrs initxattrs, void *fs_data)
 330 {
 331         struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
 332         struct xattr *lsm_xattr, *evm_xattr, *xattr;
 333         int ret;
 334
 335         if (unlikely(IS_PRIVATE(inode)))
 336                 return 0;
 337
 338         memset(new_xattrs, 0, sizeof new_xattrs);
 339         if (!initxattrs)
 340                 return security_ops->inode_init_security(inode, dir, qstr,
 341                                                          NULL, NULL, NULL);
 342         lsm_xattr = new_xattrs;
 343         ret = security_ops->inode_init_security(inode, dir, qstr,
 344                                                 &lsm_xattr->name,
 345                                                 &lsm_xattr->value,
 346                                                 &lsm_xattr->value_len);
 347         if (ret)
 348                 goto out;
 349
 350         evm_xattr = lsm_xattr + 1;
 351         ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
 352         if (ret)
 353                 goto out;
 354         ret = initxattrs(inode, new_xattrs, fs_data);
 355 out:
 356         for (xattr = new_xattrs; xattr->name != NULL; xattr++) {
 357                 kfree(xattr->name);
 358                 kfree(xattr->value);
 359         }
 360         return (ret == -EOPNOTSUPP) ? 0 : ret;
 361 }
 362 EXPORT_SYMBOL(security_inode_init_security);
 363
 364 int security_old_inode_init_security(struct inode *inode, struct inode *dir,
 365                                      const struct qstr *qstr, char **name,
 366                                      void **value, size_t *len)
 367 {
 368         if (unlikely(IS_PRIVATE(inode)))
 369                 return -EOPNOTSUPP;
 370         return security_ops->inode_init_security(inode, dir, qstr, name, value,
 371                                                  len);
 372 }
 373 EXPORT_SYMBOL(security_old_inode_init_security);
 374
 375 #ifdef CONFIG_SECURITY_PATH
 376 int security_path_mknod(struct path *dir, struct dentry *dentry, umode_t mode,
 377                         unsigned int dev)
 378 {
 379         if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
 380                 return 0;
 381         return security_ops->path_mknod(dir, dentry, mode, dev);
 382 }
 383 EXPORT_SYMBOL(security_path_mknod);
 384
 385 int security_path_mkdir(struct path *dir, struct dentry *dentry, umode_t mode)
 386 {
 387         if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
 388                 return 0;
 389         return security_ops->path_mkdir(dir, dentry, mode);
 390 }
 391 EXPORT_SYMBOL(security_path_mkdir);
 392
 393 int security_path_rmdir(struct path *dir, struct dentry *dentry)
 394 {
 395         if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
 396                 return 0;
 397         return security_ops->path_rmdir(dir, dentry);
 398 }
 399
 400 int security_path_unlink(struct path *dir, struct dentry *dentry)
 401 {
 402         if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
 403                 return 0;
 404         return security_ops->path_unlink(dir, dentry);
 405 }
 406 EXPORT_SYMBOL(security_path_unlink);
 407
 408 int security_path_symlink(struct path *dir, struct dentry *dentry,
 409                           const char *old_name)
 410 {
 411         if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
 412                 return 0;
 413         return security_ops->path_symlink(dir, dentry, old_name);
 414 }
 415
 416 int security_path_link(struct dentry *old_dentry, struct path *new_dir,
 417                        struct dentry *new_dentry)
 418 {
 419         if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
 420                 return 0;
 421         return security_ops->path_link(old_dentry, new_dir, new_dentry);
 422 }
 423
 424 int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
 425                          struct path *new_dir, struct dentry *new_dentry)
 426 {
 427         if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
 428                      (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
 429                 return 0;
 430         return security_ops->path_rename(old_dir, old_dentry, new_dir,
 431                                          new_dentry);
 432 }
 433 EXPORT_SYMBOL(security_path_rename);
 434
 435 int security_path_truncate(struct path *path)
 436 {
 437         if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
 438                 return 0;
 439         return security_ops->path_truncate(path);
 440 }
 441
 442 int security_path_chmod(struct path *path, umode_t mode)
 443 {
 444         if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
 445                 return 0;
 446         return security_ops->path_chmod(path, mode);
 447 }
 448
 449 int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
 450 {
 451         if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
 452                 return 0;
 453         return security_ops->path_chown(path, uid, gid);
 454 }
 455
 456 int security_path_chroot(struct path *path)
 457 {
 458         return security_ops->path_chroot(path);
 459 }
 460 #endif
 461
 462 int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
 463 {
 464         if (unlikely(IS_PRIVATE(dir)))
 465                 return 0;
 466         return security_ops->inode_create(dir, dentry, mode);
 467 }
 468 EXPORT_SYMBOL_GPL(security_inode_create);
 469
 470 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
 471                          struct dentry *new_dentry)
 472 {
 473         if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
 474                 return 0;
 475         return security_ops->inode_link(old_dentry, dir, new_dentry);
 476 }
 477
 478 int security_inode_unlink(struct inode *dir, struct dentry *dentry)
 479 {
 480         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 481                 return 0;
 482         return security_ops->inode_unlink(dir, dentry);
 483 }
 484
 485 int security_inode_symlink(struct inode *dir, struct dentry *dentry,
 486                             const char *old_name)
 487 {
 488         if (unlikely(IS_PRIVATE(dir)))
 489                 return 0;
 490         return security_ops->inode_symlink(dir, dentry, old_name);
 491 }
 492
 493 int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 494 {
 495         if (unlikely(IS_PRIVATE(dir)))
 496                 return 0;
 497         return security_ops->inode_mkdir(dir, dentry, mode);
 498 }
 499 EXPORT_SYMBOL_GPL(security_inode_mkdir);
 500
 501 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
 502 {
 503         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 504                 return 0;
 505         return security_ops->inode_rmdir(dir, dentry);
 506 }
 507
 508 int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 509 {
 510         if (unlikely(IS_PRIVATE(dir)))
 511                 return 0;
 512         return security_ops->inode_mknod(dir, dentry, mode, dev);
 513 }
 514
 515 int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
 516                            struct inode *new_dir, struct dentry *new_dentry)
 517 {
 518         if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
 519             (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
 520                 return 0;
 521         return security_ops->inode_rename(old_dir, old_dentry,
 522                                            new_dir, new_dentry);
 523 }
 524
 525 int security_inode_readlink(struct dentry *dentry)
 526 {
 527         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 528                 return 0;
 529         return security_ops->inode_readlink(dentry);
 530 }
 531
 532 int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
 533 {
 534         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 535                 return 0;
 536         return security_ops->inode_follow_link(dentry, nd);
 537 }
 538
 539 int security_inode_permission(struct inode *inode, int mask)
 540 {
 541         if (unlikely(IS_PRIVATE(inode)))
 542                 return 0;
 543         return security_ops->inode_permission(inode, mask);
 544 }
 545
 546 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
 547 {
 548         int ret;
 549
 550         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 551                 return 0;
 552         ret = security_ops->inode_setattr(dentry, attr);
 553         if (ret)
 554                 return ret;
 555         return evm_inode_setattr(dentry, attr);
 556 }
 557 EXPORT_SYMBOL_GPL(security_inode_setattr);
 558
 559 int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
 560 {
 561         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 562                 return 0;
 563         return security_ops->inode_getattr(mnt, dentry);
 564 }
 565
 566 int security_inode_setxattr(struct dentry *dentry, const char *name,
 567                             const void *value, size_t size, int flags)
 568 {
 569         int ret;
 570
 571         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 572                 return 0;
 573         ret = security_ops->inode_setxattr(dentry, name, value, size, flags);
 574         if (ret)
 575                 return ret;
 576         ret = ima_inode_setxattr(dentry, name, value, size);
 577         if (ret)
 578                 return ret;
 579         return evm_inode_setxattr(dentry, name, value, size);
 580 }
 581
 582 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
 583                                   const void *value, size_t size, int flags)
 584 {
 585         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 586                 return;
 587         security_ops->inode_post_setxattr(dentry, name, value, size, flags);
 588         evm_inode_post_setxattr(dentry, name, value, size);
 589 }
 590
 591 int security_inode_getxattr(struct dentry *dentry, const char *name)
 592 {
 593         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 594                 return 0;
 595         return security_ops->inode_getxattr(dentry, name);
 596 }
 597
 598 int security_inode_listxattr(struct dentry *dentry)
 599 {
 600         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 601                 return 0;
 602         return security_ops->inode_listxattr(dentry);
 603 }
 604
 605 int security_inode_removexattr(struct dentry *dentry, const char *name)
 606 {
 607         int ret;
 608
 609         if (unlikely(IS_PRIVATE(dentry->d_inode)))
 610                 return 0;
 611         ret = security_ops->inode_removexattr(dentry, name);
 612         if (ret)
 613                 return ret;
 614         ret = ima_inode_removexattr(dentry, name);
 615         if (ret)
 616                 return ret;
 617         return evm_inode_removexattr(dentry, name);
 618 }
 619
 620 int security_inode_need_killpriv(struct dentry *dentry)
 621 {
 622         return security_ops->inode_need_killpriv(dentry);
 623 }
 624
 625 int security_inode_killpriv(struct dentry *dentry)
 626 {
 627         return security_ops->inode_killpriv(dentry);
 628 }
 629
 630 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
 631 {
 632         if (unlikely(IS_PRIVATE(inode)))
 633                 return -EOPNOTSUPP;
 634         return security_ops->inode_getsecurity(inode, name, buffer, alloc);
 635 }
 636
 637 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
 638 {
 639         if (unlikely(IS_PRIVATE(inode)))
 640                 return -EOPNOTSUPP;
 641         return security_ops->inode_setsecurity(inode, name, value, size, flags);
 642 }
 643
 644 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
 645 {
 646         if (unlikely(IS_PRIVATE(inode)))
 647                 return 0;
 648         return security_ops->inode_listsecurity(inode, buffer, buffer_size);
 649 }
 650
 651 void security_inode_getsecid(const struct inode *inode, u32 *secid)
 652 {
 653         security_ops->inode_getsecid(inode, secid);
 654 }
 655
 656 int security_file_permission(struct file *file, int mask)
 657 {
 658         int ret;
 659
 660         ret = security_ops->file_permission(file, mask);
 661         if (ret)
 662                 return ret;
 663
 664         return fsnotify_perm(file, mask);
 665 }
 666
 667 int security_file_alloc(struct file *file)
 668 {
 669         return security_ops->file_alloc_security(file);
 670 }
 671
 672 void security_file_free(struct file *file)
 673 {
 674         security_ops->file_free_security(file);
 675 }
 676
 677 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 678 {
 679         return security_ops->file_ioctl(file, cmd, arg);
 680 }
 681
 682 static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
 683 {
 684         /*
 685          * Does we have PROT_READ and does the application expect
 686          * it to imply PROT_EXEC?  If not, nothing to talk about...
 687          */
 688         if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
 689                 return prot;
 690         if (!(current->personality & READ_IMPLIES_EXEC))
 691                 return prot;
 692         /*
 693          * if that's an anonymous mapping, let it.
 694          */
 695         if (!file)
 696                 return prot | PROT_EXEC;
 697         /*
 698          * ditto if it's not on noexec mount, except that on !MMU we need
 699          * BDI_CAP_EXEC_MMAP (== VM_MAYEXEC) in this case
 700          */
 701         if (!(file->f_path.mnt->mnt_flags & MNT_NOEXEC)) {
 702 #ifndef CONFIG_MMU
 703                 unsigned long caps = 0;
 704                 struct address_space *mapping = file->f_mapping;
 705                 if (mapping && mapping->backing_dev_info)
 706                         caps = mapping->backing_dev_info->capabilities;
 707                 if (!(caps & BDI_CAP_EXEC_MAP))
 708                         return prot;
 709 #endif
 710                 return prot | PROT_EXEC;
 711         }
 712         /* anything on noexec mount won't get PROT_EXEC */
 713         return prot;
 714 }
 715
 716 int security_mmap_file(struct file *file, unsigned long prot,
 717                         unsigned long flags)
 718 {
 719         int ret;
 720         ret = security_ops->mmap_file(file, prot,
 721                                         mmap_prot(file, prot), flags);
 722         if (ret)
 723                 return ret;
 724         return ima_file_mmap(file, prot);
 725 }
 726
 727 int security_mmap_addr(unsigned long addr)
 728 {
 729         return security_ops->mmap_addr(addr);
 730 }
 731
 732 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
 733                             unsigned long prot)
 734 {
 735         return security_ops->file_mprotect(vma, reqprot, prot);
 736 }
 737
 738 int security_file_lock(struct file *file, unsigned int cmd)
 739 {
 740         return security_ops->file_lock(file, cmd);
 741 }
 742
 743 int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
 744 {
 745         return security_ops->file_fcntl(file, cmd, arg);
 746 }
 747
 748 int security_file_set_fowner(struct file *file)
 749 {
 750         return security_ops->file_set_fowner(file);
 751 }
 752
 753 int security_file_send_sigiotask(struct task_struct *tsk,
 754                                   struct fown_struct *fown, int sig)
 755 {
 756         return security_ops->file_send_sigiotask(tsk, fown, sig);
 757 }
 758
 759 int security_file_receive(struct file *file)
 760 {
 761         return security_ops->file_receive(file);
 762 }
 763
 764 int security_file_open(struct file *file, const struct cred *cred)
 765 {
 766         int ret;
 767
 768         ret = security_ops->file_open(file, cred);
 769         if (ret)
 770                 return ret;
 771
 772         return fsnotify_perm(file, MAY_OPEN);
 773 }
 774
 775 int security_task_create(unsigned long clone_flags)
 776 {
 777         return security_ops->task_create(clone_flags);
 778 }
 779
 780 void security_task_free(struct task_struct *task)
 781 {
 782 #ifdef CONFIG_SECURITY_YAMA_STACKED
 783         yama_task_free(task);
 784 #endif
 785         security_ops->task_free(task);
 786 }
 787
 788 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
 789 {
 790         return security_ops->cred_alloc_blank(cred, gfp);
 791 }
 792
 793 void security_cred_free(struct cred *cred)
 794 {
 795         security_ops->cred_free(cred);
 796 }
 797
 798 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
 799 {
 800         return security_ops->cred_prepare(new, old, gfp);
 801 }
 802
 803 void security_transfer_creds(struct cred *new, const struct cred *old)
 804 {
 805         security_ops->cred_transfer(new, old);
 806 }
 807
 808 int security_kernel_act_as(struct cred *new, u32 secid)
 809 {
 810         return security_ops->kernel_act_as(new, secid);
 811 }
 812
 813 int security_kernel_create_files_as(struct cred *new, struct inode *inode)
 814 {
 815         return security_ops->kernel_create_files_as(new, inode);
 816 }
 817
 818 int security_kernel_module_request(char *kmod_name)
 819 {
 820         return security_ops->kernel_module_request(kmod_name);
 821 }
 822
 823 int security_task_fix_setuid(struct cred *new, const struct cred *old,
 824                              int flags)
 825 {
 826         return security_ops->task_fix_setuid(new, old, flags);
 827 }
 828
 829 int security_task_setpgid(struct task_struct *p, pid_t pgid)
 830 {
 831         return security_ops->task_setpgid(p, pgid);
 832 }
 833
 834 int security_task_getpgid(struct task_struct *p)
 835 {
 836         return security_ops->task_getpgid(p);
 837 }
 838
 839 int security_task_getsid(struct task_struct *p)
 840 {
 841         return security_ops->task_getsid(p);
 842 }
 843
 844 void security_task_getsecid(struct task_struct *p, u32 *secid)
 845 {
 846         security_ops->task_getsecid(p, secid);
 847 }
 848 EXPORT_SYMBOL(security_task_getsecid);
 849
 850 int security_task_setnice(struct task_struct *p, int nice)
 851 {
 852         return security_ops->task_setnice(p, nice);
 853 }
 854
 855 int security_task_setioprio(struct task_struct *p, int ioprio)
 856 {
 857         return security_ops->task_setioprio(p, ioprio);
 858 }
 859
 860 int security_task_getioprio(struct task_struct *p)
 861 {
 862         return security_ops->task_getioprio(p);
 863 }
 864
 865 int security_task_setrlimit(struct task_struct *p, unsigned int resource,
 866                 struct rlimit *new_rlim)
 867 {
 868         return security_ops->task_setrlimit(p, resource, new_rlim);
 869 }
 870
 871 int security_task_setscheduler(struct task_struct *p)
 872 {
 873         return security_ops->task_setscheduler(p);
 874 }
 875
 876 int security_task_getscheduler(struct task_struct *p)
 877 {
 878         return security_ops->task_getscheduler(p);
 879 }
 880
 881 int security_task_movememory(struct task_struct *p)
 882 {
 883         return security_ops->task_movememory(p);
 884 }
 885
 886 int security_task_kill(struct task_struct *p, struct siginfo *info,
 887                         int sig, u32 secid)
 888 {
 889         return security_ops->task_kill(p, info, sig, secid);
 890 }
 891
 892 int security_task_wait(struct task_struct *p)
 893 {
 894         return security_ops->task_wait(p);
 895 }
 896
 897 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 898                          unsigned long arg4, unsigned long arg5)
 899 {
 900 #ifdef CONFIG_SECURITY_YAMA_STACKED
 901         int rc;
 902         rc = yama_task_prctl(option, arg2, arg3, arg4, arg5);
 903         if (rc != -ENOSYS)
 904                 return rc;
 905 #endif
 906         return security_ops->task_prctl(option, arg2, arg3, arg4, arg5);
 907 }
 908
 909 void security_task_to_inode(struct task_struct *p, struct inode *inode)
 910 {
 911         security_ops->task_to_inode(p, inode);
 912 }
 913
 914 int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
 915 {
 916         return security_ops->ipc_permission(ipcp, flag);
 917 }
 918
 919 void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
 920 {
 921         security_ops->ipc_getsecid(ipcp, secid);
 922 }
 923
 924 int security_msg_msg_alloc(struct msg_msg *msg)
 925 {
 926         return security_ops->msg_msg_alloc_security(msg);
 927 }
 928
 929 void security_msg_msg_free(struct msg_msg *msg)
 930 {
 931         security_ops->msg_msg_free_security(msg);
 932 }
 933
 934 int security_msg_queue_alloc(struct msg_queue *msq)
 935 {
 936         return security_ops->msg_queue_alloc_security(msq);
 937 }
 938
 939 void security_msg_queue_free(struct msg_queue *msq)
 940 {
 941         security_ops->msg_queue_free_security(msq);
 942 }
 943
 944 int security_msg_queue_associate(struct msg_queue *msq, int msqflg)
 945 {
 946         return security_ops->msg_queue_associate(msq, msqflg);
 947 }
 948
 949 int security_msg_queue_msgctl(struct msg_queue *msq, int cmd)
 950 {
 951         return security_ops->msg_queue_msgctl(msq, cmd);
 952 }
 953
 954 int security_msg_queue_msgsnd(struct msg_queue *msq,
 955                                struct msg_msg *msg, int msqflg)
 956 {
 957         return security_ops->msg_queue_msgsnd(msq, msg, msqflg);
 958 }
 959
 960 int security_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
 961                                struct task_struct *target, long type, int mode)
 962 {
 963         return security_ops->msg_queue_msgrcv(msq, msg, target, type, mode);
 964 }
 965
 966 int security_shm_alloc(struct shmid_kernel *shp)
 967 {
 968         return security_ops->shm_alloc_security(shp);
 969 }
 970
 971 void security_shm_free(struct shmid_kernel *shp)
 972 {
 973         security_ops->shm_free_security(shp);
 974 }
 975
 976 int security_shm_associate(struct shmid_kernel *shp, int shmflg)
 977 {
 978         return security_ops->shm_associate(shp, shmflg);
 979 }
 980
 981 int security_shm_shmctl(struct shmid_kernel *shp, int cmd)
 982 {
 983         return security_ops->shm_shmctl(shp, cmd);
 984 }
 985
 986 int security_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg)
 987 {
 988         return security_ops->shm_shmat(shp, shmaddr, shmflg);
 989 }
 990
 991 int security_sem_alloc(struct sem_array *sma)
 992 {
 993         return security_ops->sem_alloc_security(sma);
 994 }
 995
 996 void security_sem_free(struct sem_array *sma)
 997 {
 998         security_ops->sem_free_security(sma);
 999 }
1000
1001 int security_sem_associate(struct sem_array *sma, int semflg)
1002 {
1003         return security_ops->sem_associate(sma, semflg);
1004 }
1005
1006 int security_sem_semctl(struct sem_array *sma, int cmd)
1007 {
1008         return security_ops->sem_semctl(sma, cmd);
1009 }
1010
1011 int security_sem_semop(struct sem_array *sma, struct sembuf *sops,
1012                         unsigned nsops, int alter)
1013 {
1014         return security_ops->sem_semop(sma, sops, nsops, alter);
1015 }
1016
1017 void security_d_instantiate(struct dentry *dentry, struct inode *inode)
1018 {
1019         if (unlikely(inode && IS_PRIVATE(inode)))
1020                 return;
1021         security_ops->d_instantiate(dentry, inode);
1022 }
1023 EXPORT_SYMBOL(security_d_instantiate);
1024
1025 int security_getprocattr(struct task_struct *p, char *name, char **value)
1026 {
1027         return security_ops->getprocattr(p, name, value);
1028 }
1029
1030 int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
1031 {
1032         return security_ops->setprocattr(p, name, value, size);
1033 }
1034
1035 int security_netlink_send(struct sock *sk, struct sk_buff *skb)
1036 {
1037         return security_ops->netlink_send(sk, skb);
1038 }
1039
1040 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
1041 {
1042         return security_ops->secid_to_secctx(secid, secdata, seclen);
1043 }
1044 EXPORT_SYMBOL(security_secid_to_secctx);
1045
1046 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
1047 {
1048         return security_ops->secctx_to_secid(secdata, seclen, secid);
1049 }
1050 EXPORT_SYMBOL(security_secctx_to_secid);
1051
1052 void security_release_secctx(char *secdata, u32 seclen)
1053 {
1054         security_ops->release_secctx(secdata, seclen);
1055 }
1056 EXPORT_SYMBOL(security_release_secctx);
1057
1058 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
1059 {
1060         return security_ops->inode_notifysecctx(inode, ctx, ctxlen);
1061 }
1062 EXPORT_SYMBOL(security_inode_notifysecctx);
1063
1064 int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
1065 {
1066         return security_ops->inode_setsecctx(dentry, ctx, ctxlen);
1067 }
1068 EXPORT_SYMBOL(security_inode_setsecctx);
1069
1070 int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
1071 {
1072         return security_ops->inode_getsecctx(inode, ctx, ctxlen);
1073 }
1074 EXPORT_SYMBOL(security_inode_getsecctx);
1075
1076 #ifdef CONFIG_SECURITY_NETWORK
1077
1078 int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)
1079 {
1080         return security_ops->unix_stream_connect(sock, other, newsk);
1081 }
1082 EXPORT_SYMBOL(security_unix_stream_connect);
1083
1084 int security_unix_may_send(struct socket *sock,  struct socket *other)
1085 {
1086         return security_ops->unix_may_send(sock, other);
1087 }
1088 EXPORT_SYMBOL(security_unix_may_send);
1089
1090 int security_socket_create(int family, int type, int protocol, int kern)
1091 {
1092         return security_ops->socket_create(family, type, protocol, kern);
1093 }
1094
1095 int security_socket_post_create(struct socket *sock, int family,
1096                                 int type, int protocol, int kern)
1097 {
1098         return security_ops->socket_post_create(sock, family, type,
1099                                                 protocol, kern);
1100 }
1101
1102 int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
1103 {
1104         return security_ops->socket_bind(sock, address, addrlen);
1105 }
1106
1107 int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
1108 {
1109         return security_ops->socket_connect(sock, address, addrlen);
1110 }
1111
1112 int security_socket_listen(struct socket *sock, int backlog)
1113 {
1114         return security_ops->socket_listen(sock, backlog);
1115 }
1116
1117 int security_socket_accept(struct socket *sock, struct socket *newsock)
1118 {
1119         return security_ops->socket_accept(sock, newsock);
1120 }
1121
1122 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
1123 {
1124         return security_ops->socket_sendmsg(sock, msg, size);
1125 }
1126
1127 int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
1128                             int size, int flags)
1129 {
1130         return security_ops->socket_recvmsg(sock, msg, size, flags);
1131 }
1132
1133 int security_socket_getsockname(struct socket *sock)
1134 {
1135         return security_ops->socket_getsockname(sock);
1136 }
1137
1138 int security_socket_getpeername(struct socket *sock)
1139 {
1140         return security_ops->socket_getpeername(sock);
1141 }
1142
1143 int security_socket_getsockopt(struct socket *sock, int level, int optname)
1144 {
1145         return security_ops->socket_getsockopt(sock, level, optname);
1146 }
1147
1148 int security_socket_setsockopt(struct socket *sock, int level, int optname)
1149 {
1150         return security_ops->socket_setsockopt(sock, level, optname);
1151 }
1152
1153 int security_socket_shutdown(struct socket *sock, int how)
1154 {
1155         return security_ops->socket_shutdown(sock, how);
1156 }
1157
1158 int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1159 {
1160         return security_ops->socket_sock_rcv_skb(sk, skb);
1161 }
1162 EXPORT_SYMBOL(security_sock_rcv_skb);
1163
1164 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
1165                                       int __user *optlen, unsigned len)
1166 {
1167         return security_ops->socket_getpeersec_stream(sock, optval, optlen, len);
1168 }
1169
1170 int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
1171 {
1172         return security_ops->socket_getpeersec_dgram(sock, skb, secid);
1173 }
1174 EXPORT_SYMBOL(security_socket_getpeersec_dgram);
1175
1176 int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
1177 {
1178         return security_ops->sk_alloc_security(sk, family, priority);
1179 }
1180
1181 void security_sk_free(struct sock *sk)
1182 {
1183         security_ops->sk_free_security(sk);
1184 }
1185
1186 void security_sk_clone(const struct sock *sk, struct sock *newsk)
1187 {
1188         security_ops->sk_clone_security(sk, newsk);
1189 }
1190 EXPORT_SYMBOL(security_sk_clone);
1191
1192 void security_sk_classify_flow(struct sock *sk, struct flowi *fl)
1193 {
1194         security_ops->sk_getsecid(sk, &fl->flowi_secid);
1195 }
1196 EXPORT_SYMBOL(security_sk_classify_flow);
1197
1198 void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
1199 {
1200         security_ops->req_classify_flow(req, fl);
1201 }
1202 EXPORT_SYMBOL(security_req_classify_flow);
1203
1204 void security_sock_graft(struct sock *sk, struct socket *parent)
1205 {
1206         security_ops->sock_graft(sk, parent);
1207 }
1208 EXPORT_SYMBOL(security_sock_graft);
1209
1210 int security_inet_conn_request(struct sock *sk,
1211                         struct sk_buff *skb, struct request_sock *req)
1212 {
1213         return security_ops->inet_conn_request(sk, skb, req);
1214 }
1215 EXPORT_SYMBOL(security_inet_conn_request);
1216
1217 void security_inet_csk_clone(struct sock *newsk,
1218                         const struct request_sock *req)
1219 {
1220         security_ops->inet_csk_clone(newsk, req);
1221 }
1222
1223 void security_inet_conn_established(struct sock *sk,
1224                         struct sk_buff *skb)
1225 {
1226         security_ops->inet_conn_established(sk, skb);
1227 }
1228
1229 int security_secmark_relabel_packet(u32 secid)
1230 {
1231         return security_ops->secmark_relabel_packet(secid);
1232 }
1233 EXPORT_SYMBOL(security_secmark_relabel_packet);
1234
1235 void security_secmark_refcount_inc(void)
1236 {
1237         security_ops->secmark_refcount_inc();
1238 }
1239 EXPORT_SYMBOL(security_secmark_refcount_inc);
1240
1241 void security_secmark_refcount_dec(void)
1242 {
1243         security_ops->secmark_refcount_dec();
1244 }
1245 EXPORT_SYMBOL(security_secmark_refcount_dec);
1246
1247 int security_tun_dev_create(void)
1248 {
1249         return security_ops->tun_dev_create();
1250 }
1251 EXPORT_SYMBOL(security_tun_dev_create);
1252
1253 void security_tun_dev_post_create(struct sock *sk)
1254 {
1255         return security_ops->tun_dev_post_create(sk);
1256 }
1257 EXPORT_SYMBOL(security_tun_dev_post_create);
1258
1259 int security_tun_dev_attach(struct sock *sk)
1260 {
1261         return security_ops->tun_dev_attach(sk);
1262 }
1263 EXPORT_SYMBOL(security_tun_dev_attach);
1264
1265 #endif  /* CONFIG_SECURITY_NETWORK */
1266
1267 #ifdef CONFIG_SECURITY_NETWORK_XFRM
1268
1269 int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
1270 {
1271         return security_ops->xfrm_policy_alloc_security(ctxp, sec_ctx);
1272 }
1273 EXPORT_SYMBOL(security_xfrm_policy_alloc);
1274
1275 int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
1276                               struct xfrm_sec_ctx **new_ctxp)
1277 {
1278         return security_ops->xfrm_policy_clone_security(old_ctx, new_ctxp);
1279 }
1280
1281 void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
1282 {
1283         security_ops->xfrm_policy_free_security(ctx);
1284 }
1285 EXPORT_SYMBOL(security_xfrm_policy_free);
1286
1287 int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
1288 {
1289         return security_ops->xfrm_policy_delete_security(ctx);
1290 }
1291
1292 int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
1293 {
1294         return security_ops->xfrm_state_alloc_security(x, sec_ctx, 0);
1295 }
1296 EXPORT_SYMBOL(security_xfrm_state_alloc);
1297
1298 int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
1299                                       struct xfrm_sec_ctx *polsec, u32 secid)
1300 {
1301         if (!polsec)
1302                 return 0;
1303         /*
1304          * We want the context to be taken from secid which is usually
1305          * from the sock.
1306          */
1307         return security_ops->xfrm_state_alloc_security(x, NULL, secid);
1308 }
1309
1310 int security_xfrm_state_delete(struct xfrm_state *x)
1311 {
1312         return security_ops->xfrm_state_delete_security(x);
1313 }
1314 EXPORT_SYMBOL(security_xfrm_state_delete);
1315
1316 void security_xfrm_state_free(struct xfrm_state *x)
1317 {
1318         security_ops->xfrm_state_free_security(x);
1319 }
1320
1321 int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
1322 {
1323         return security_ops->xfrm_policy_lookup(ctx, fl_secid, dir);
1324 }
1325
1326 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
1327                                        struct xfrm_policy *xp,
1328                                        const struct flowi *fl)
1329 {
1330         return security_ops->xfrm_state_pol_flow_match(x, xp, fl);
1331 }
1332
1333 int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
1334 {
1335         return security_ops->xfrm_decode_session(skb, secid, 1);
1336 }
1337
1338 void security_skb_classify_flow(struct sk_buff *skb, struct flowi *fl)
1339 {
1340         int rc = security_ops->xfrm_decode_session(skb, &fl->flowi_secid, 0);
1341
1342         BUG_ON(rc);
1343 }
1344 EXPORT_SYMBOL(security_skb_classify_flow);
1345
1346 #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
1347
1348 #ifdef CONFIG_KEYS
1349
1350 int security_key_alloc(struct key *key, const struct cred *cred,
1351                        unsigned long flags)
1352 {
1353         return security_ops->key_alloc(key, cred, flags);
1354 }
1355
1356 void security_key_free(struct key *key)
1357 {
1358         security_ops->key_free(key);
1359 }
1360
1361 int security_key_permission(key_ref_t key_ref,
1362                             const struct cred *cred, key_perm_t perm)
1363 {
1364         return security_ops->key_permission(key_ref, cred, perm);
1365 }
1366
1367 int security_key_getsecurity(struct key *key, char **_buffer)
1368 {
1369         return security_ops->key_getsecurity(key, _buffer);
1370 }
1371
1372 #endif  /* CONFIG_KEYS */
1373
1374 #ifdef CONFIG_AUDIT
1375
1376 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
1377 {
1378         return security_ops->audit_rule_init(field, op, rulestr, lsmrule);
1379 }
1380
1381 int security_audit_rule_known(struct audit_krule *krule)
1382 {
1383         return security_ops->audit_rule_known(krule);
1384 }
1385
1386 void security_audit_rule_free(void *lsmrule)
1387 {
1388         security_ops->audit_rule_free(lsmrule);
1389 }
1390
1391 int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
1392                               struct audit_context *actx)
1393 {
1394         return security_ops->audit_rule_match(secid, field, op, lsmrule, actx);
1395 }
1396
1397 #endif /* CONFIG_AUDIT */