1 /* Common capabilities, needed by capability.o. 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License as published by 5 * the Free Software Foundation; either version 2 of the License, or 6 * (at your option) any later version. 7 * 8 */ 9 10 #include <linux/capability.h> 11 #include <linux/audit.h> 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/lsm_hooks.h> 16 #include <linux/file.h> 17 #include <linux/mm.h> 18 #include <linux/mman.h> 19 #include <linux/pagemap.h> 20 #include <linux/swap.h> 21 #include <linux/skbuff.h> 22 #include <linux/netlink.h> 23 #include <linux/ptrace.h> 24 #include <linux/xattr.h> 25 #include <linux/hugetlb.h> 26 #include <linux/mount.h> 27 #include <linux/sched.h> 28 #include <linux/prctl.h> 29 #include <linux/securebits.h> 30 #include <linux/user_namespace.h> 31 #include <linux/binfmts.h> 32 #include <linux/personality.h> 33 34 /* 35 * If a non-root user executes a setuid-root binary in 36 * !secure(SECURE_NOROOT) mode, then we raise capabilities. 37 * However if fE is also set, then the intent is for only 38 * the file capabilities to be applied, and the setuid-root 39 * bit is left on either to change the uid (plausible) or 40 * to get full privilege on a kernel without file capabilities 41 * support. So in that case we do not raise capabilities. 42 * 43 * Warn if that happens, once per boot. 44 */ 45 static void warn_setuid_and_fcaps_mixed(const char *fname) 46 { 47 static int warned; 48 if (!warned) { 49 printk(KERN_INFO "warning: `%s' has both setuid-root and" 50 " effective capabilities. Therefore not raising all" 51 " capabilities.\n", fname); 52 warned = 1; 53 } 54 } 55 56 /** 57 * cap_capable - Determine whether a task has a particular effective capability 58 * @cred: The credentials to use 59 * @ns: The user namespace in which we need the capability 60 * @cap: The capability to check for 61 * @audit: Whether to write an audit message or not 62 * 63 * Determine whether the nominated task has the specified capability amongst 64 * its effective set, returning 0 if it does, -ve if it does not. 65 * 66 * NOTE WELL: cap_has_capability() cannot be used like the kernel's capable() 67 * and has_capability() functions. That is, it has the reverse semantics: 68 * cap_has_capability() returns 0 when a task has a capability, but the 69 * kernel's capable() and has_capability() returns 1 for this case. 70 */ 71 int cap_capable(const struct cred *cred, struct user_namespace *targ_ns, 72 int cap, int audit) 73 { 74 struct user_namespace *ns = targ_ns; 75 76 /* See if cred has the capability in the target user namespace 77 * by examining the target user namespace and all of the target 78 * user namespace's parents. 79 */ 80 for (;;) { 81 /* Do we have the necessary capabilities? */ 82 if (ns == cred->user_ns) 83 return cap_raised(cred->cap_effective, cap) ? 0 : -EPERM; 84 85 /* 86 * If we're already at a lower level than we're looking for, 87 * we're done searching. 88 */ 89 if (ns->level <= cred->user_ns->level) 90 return -EPERM; 91 92 /* 93 * The owner of the user namespace in the parent of the 94 * user namespace has all caps. 95 */ 96 if ((ns->parent == cred->user_ns) && uid_eq(ns->owner, cred->euid)) 97 return 0; 98 99 /* 100 * If you have a capability in a parent user ns, then you have 101 * it over all children user namespaces as well. 102 */ 103 ns = ns->parent; 104 } 105 106 /* We never get here */ 107 } 108 109 /** 110 * cap_settime - Determine whether the current process may set the system clock 111 * @ts: The time to set 112 * @tz: The timezone to set 113 * 114 * Determine whether the current process may set the system clock and timezone 115 * information, returning 0 if permission granted, -ve if denied. 116 */ 117 int cap_settime(const struct timespec64 *ts, const struct timezone *tz) 118 { 119 if (!capable(CAP_SYS_TIME)) 120 return -EPERM; 121 return 0; 122 } 123 124 /** 125 * cap_ptrace_access_check - Determine whether the current process may access 126 * another 127 * @child: The process to be accessed 128 * @mode: The mode of attachment. 129 * 130 * If we are in the same or an ancestor user_ns and have all the target 131 * task's capabilities, then ptrace access is allowed. 132 * If we have the ptrace capability to the target user_ns, then ptrace 133 * access is allowed. 134 * Else denied. 135 * 136 * Determine whether a process may access another, returning 0 if permission 137 * granted, -ve if denied. 138 */ 139 int cap_ptrace_access_check(struct task_struct *child, unsigned int mode) 140 { 141 int ret = 0; 142 const struct cred *cred, *child_cred; 143 const kernel_cap_t *caller_caps; 144 145 rcu_read_lock(); 146 cred = current_cred(); 147 child_cred = __task_cred(child); 148 if (mode & PTRACE_MODE_FSCREDS) 149 caller_caps = &cred->cap_effective; 150 else 151 caller_caps = &cred->cap_permitted; 152 if (cred->user_ns == child_cred->user_ns && 153 cap_issubset(child_cred->cap_permitted, *caller_caps)) 154 goto out; 155 if (ns_capable(child_cred->user_ns, CAP_SYS_PTRACE)) 156 goto out; 157 ret = -EPERM; 158 out: 159 rcu_read_unlock(); 160 return ret; 161 } 162 163 /** 164 * cap_ptrace_traceme - Determine whether another process may trace the current 165 * @parent: The task proposed to be the tracer 166 * 167 * If parent is in the same or an ancestor user_ns and has all current's 168 * capabilities, then ptrace access is allowed. 169 * If parent has the ptrace capability to current's user_ns, then ptrace 170 * access is allowed. 171 * Else denied. 172 * 173 * Determine whether the nominated task is permitted to trace the current 174 * process, returning 0 if permission is granted, -ve if denied. 175 */ 176 int cap_ptrace_traceme(struct task_struct *parent) 177 { 178 int ret = 0; 179 const struct cred *cred, *child_cred; 180 181 rcu_read_lock(); 182 cred = __task_cred(parent); 183 child_cred = current_cred(); 184 if (cred->user_ns == child_cred->user_ns && 185 cap_issubset(child_cred->cap_permitted, cred->cap_permitted)) 186 goto out; 187 if (has_ns_capability(parent, child_cred->user_ns, CAP_SYS_PTRACE)) 188 goto out; 189 ret = -EPERM; 190 out: 191 rcu_read_unlock(); 192 return ret; 193 } 194 195 /** 196 * cap_capget - Retrieve a task's capability sets 197 * @target: The task from which to retrieve the capability sets 198 * @effective: The place to record the effective set 199 * @inheritable: The place to record the inheritable set 200 * @permitted: The place to record the permitted set 201 * 202 * This function retrieves the capabilities of the nominated task and returns 203 * them to the caller. 204 */ 205 int cap_capget(struct task_struct *target, kernel_cap_t *effective, 206 kernel_cap_t *inheritable, kernel_cap_t *permitted) 207 { 208 const struct cred *cred; 209 210 /* Derived from kernel/capability.c:sys_capget. */ 211 rcu_read_lock(); 212 cred = __task_cred(target); 213 *effective = cred->cap_effective; 214 *inheritable = cred->cap_inheritable; 215 *permitted = cred->cap_permitted; 216 rcu_read_unlock(); 217 return 0; 218 } 219 220 /* 221 * Determine whether the inheritable capabilities are limited to the old 222 * permitted set. Returns 1 if they are limited, 0 if they are not. 223 */ 224 static inline int cap_inh_is_capped(void) 225 { 226 227 /* they are so limited unless the current task has the CAP_SETPCAP 228 * capability 229 */ 230 if (cap_capable(current_cred(), current_cred()->user_ns, 231 CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0) 232 return 0; 233 return 1; 234 } 235 236 /** 237 * cap_capset - Validate and apply proposed changes to current's capabilities 238 * @new: The proposed new credentials; alterations should be made here 239 * @old: The current task's current credentials 240 * @effective: A pointer to the proposed new effective capabilities set 241 * @inheritable: A pointer to the proposed new inheritable capabilities set 242 * @permitted: A pointer to the proposed new permitted capabilities set 243 * 244 * This function validates and applies a proposed mass change to the current 245 * process's capability sets. The changes are made to the proposed new 246 * credentials, and assuming no error, will be committed by the caller of LSM. 247 */ 248 int cap_capset(struct cred *new, 249 const struct cred *old, 250 const kernel_cap_t *effective, 251 const kernel_cap_t *inheritable, 252 const kernel_cap_t *permitted) 253 { 254 if (cap_inh_is_capped() && 255 !cap_issubset(*inheritable, 256 cap_combine(old->cap_inheritable, 257 old->cap_permitted))) 258 /* incapable of using this inheritable set */ 259 return -EPERM; 260 261 if (!cap_issubset(*inheritable, 262 cap_combine(old->cap_inheritable, 263 old->cap_bset))) 264 /* no new pI capabilities outside bounding set */ 265 return -EPERM; 266 267 /* verify restrictions on target's new Permitted set */ 268 if (!cap_issubset(*permitted, old->cap_permitted)) 269 return -EPERM; 270 271 /* verify the _new_Effective_ is a subset of the _new_Permitted_ */ 272 if (!cap_issubset(*effective, *permitted)) 273 return -EPERM; 274 275 new->cap_effective = *effective; 276 new->cap_inheritable = *inheritable; 277 new->cap_permitted = *permitted; 278 279 /* 280 * Mask off ambient bits that are no longer both permitted and 281 * inheritable. 282 */ 283 new->cap_ambient = cap_intersect(new->cap_ambient, 284 cap_intersect(*permitted, 285 *inheritable)); 286 if (WARN_ON(!cap_ambient_invariant_ok(new))) 287 return -EINVAL; 288 return 0; 289 } 290 291 /** 292 * cap_inode_need_killpriv - Determine if inode change affects privileges 293 * @dentry: The inode/dentry in being changed with change marked ATTR_KILL_PRIV 294 * 295 * Determine if an inode having a change applied that's marked ATTR_KILL_PRIV 296 * affects the security markings on that inode, and if it is, should 297 * inode_killpriv() be invoked or the change rejected. 298 * 299 * Returns 1 if security.capability has a value, meaning inode_killpriv() 300 * is required, 0 otherwise, meaning inode_killpriv() is not required. 301 */ 302 int cap_inode_need_killpriv(struct dentry *dentry) 303 { 304 struct inode *inode = d_backing_inode(dentry); 305 int error; 306 307 error = __vfs_getxattr(dentry, inode, XATTR_NAME_CAPS, NULL, 0); 308 return error > 0; 309 } 310 311 /** 312 * cap_inode_killpriv - Erase the security markings on an inode 313 * @dentry: The inode/dentry to alter 314 * 315 * Erase the privilege-enhancing security markings on an inode. 316 * 317 * Returns 0 if successful, -ve on error. 318 */ 319 int cap_inode_killpriv(struct dentry *dentry) 320 { 321 int error; 322 323 error = __vfs_removexattr(dentry, XATTR_NAME_CAPS); 324 if (error == -EOPNOTSUPP) 325 error = 0; 326 return error; 327 } 328 329 static bool rootid_owns_currentns(kuid_t kroot) 330 { 331 struct user_namespace *ns; 332 333 if (!uid_valid(kroot)) 334 return false; 335 336 for (ns = current_user_ns(); ; ns = ns->parent) { 337 if (from_kuid(ns, kroot) == 0) 338 return true; 339 if (ns == &init_user_ns) 340 break; 341 } 342 343 return false; 344 } 345 346 static __u32 sansflags(__u32 m) 347 { 348 return m & ~VFS_CAP_FLAGS_EFFECTIVE; 349 } 350 351 static bool is_v2header(size_t size, __le32 magic) 352 { 353 __u32 m = le32_to_cpu(magic); 354 if (size != XATTR_CAPS_SZ_2) 355 return false; 356 return sansflags(m) == VFS_CAP_REVISION_2; 357 } 358 359 static bool is_v3header(size_t size, __le32 magic) 360 { 361 __u32 m = le32_to_cpu(magic); 362 363 if (size != XATTR_CAPS_SZ_3) 364 return false; 365 return sansflags(m) == VFS_CAP_REVISION_3; 366 } 367 368 /* 369 * getsecurity: We are called for security.* before any attempt to read the 370 * xattr from the inode itself. 371 * 372 * This gives us a chance to read the on-disk value and convert it. If we 373 * return -EOPNOTSUPP, then vfs_getxattr() will call the i_op handler. 374 * 375 * Note we are not called by vfs_getxattr_alloc(), but that is only called 376 * by the integrity subsystem, which really wants the unconverted values - 377 * so that's good. 378 */ 379 int cap_inode_getsecurity(struct inode *inode, const char *name, void **buffer, 380 bool alloc) 381 { 382 int size, ret; 383 kuid_t kroot; 384 uid_t root, mappedroot; 385 char *tmpbuf = NULL; 386 struct vfs_cap_data *cap; 387 struct vfs_ns_cap_data *nscap; 388 struct dentry *dentry; 389 struct user_namespace *fs_ns; 390 391 if (strcmp(name, "capability") != 0) 392 return -EOPNOTSUPP; 393 394 dentry = d_find_alias(inode); 395 if (!dentry) 396 return -EINVAL; 397 398 size = sizeof(struct vfs_ns_cap_data); 399 ret = (int) vfs_getxattr_alloc(dentry, XATTR_NAME_CAPS, 400 &tmpbuf, size, GFP_NOFS); 401 dput(dentry); 402 403 if (ret < 0) 404 return ret; 405 406 fs_ns = inode->i_sb->s_user_ns; 407 cap = (struct vfs_cap_data *) tmpbuf; 408 if (is_v2header((size_t) ret, cap->magic_etc)) { 409 /* If this is sizeof(vfs_cap_data) then we're ok with the 410 * on-disk value, so return that. */ 411 if (alloc) 412 *buffer = tmpbuf; 413 else 414 kfree(tmpbuf); 415 return ret; 416 } else if (!is_v3header((size_t) ret, cap->magic_etc)) { 417 kfree(tmpbuf); 418 return -EINVAL; 419 } 420 421 nscap = (struct vfs_ns_cap_data *) tmpbuf; 422 root = le32_to_cpu(nscap->rootid); 423 kroot = make_kuid(fs_ns, root); 424 425 /* If the root kuid maps to a valid uid in current ns, then return 426 * this as a nscap. */ 427 mappedroot = from_kuid(current_user_ns(), kroot); 428 if (mappedroot != (uid_t)-1 && mappedroot != (uid_t)0) { 429 if (alloc) { 430 *buffer = tmpbuf; 431 nscap->rootid = cpu_to_le32(mappedroot); 432 } else 433 kfree(tmpbuf); 434 return size; 435 } 436 437 if (!rootid_owns_currentns(kroot)) { 438 kfree(tmpbuf); 439 return -EOPNOTSUPP; 440 } 441 442 /* This comes from a parent namespace. Return as a v2 capability */ 443 size = sizeof(struct vfs_cap_data); 444 if (alloc) { 445 *buffer = kmalloc(size, GFP_ATOMIC); 446 if (*buffer) { 447 struct vfs_cap_data *cap = *buffer; 448 __le32 nsmagic, magic; 449 magic = VFS_CAP_REVISION_2; 450 nsmagic = le32_to_cpu(nscap->magic_etc); 451 if (nsmagic & VFS_CAP_FLAGS_EFFECTIVE) 452 magic |= VFS_CAP_FLAGS_EFFECTIVE; 453 memcpy(&cap->data, &nscap->data, sizeof(__le32) * 2 * VFS_CAP_U32); 454 cap->magic_etc = cpu_to_le32(magic); 455 } 456 } 457 kfree(tmpbuf); 458 return size; 459 } 460 461 static kuid_t rootid_from_xattr(const void *value, size_t size, 462 struct user_namespace *task_ns) 463 { 464 const struct vfs_ns_cap_data *nscap = value; 465 uid_t rootid = 0; 466 467 if (size == XATTR_CAPS_SZ_3) 468 rootid = le32_to_cpu(nscap->rootid); 469 470 return make_kuid(task_ns, rootid); 471 } 472 473 static bool validheader(size_t size, __le32 magic) 474 { 475 return is_v2header(size, magic) || is_v3header(size, magic); 476 } 477 478 /* 479 * User requested a write of security.capability. If needed, update the 480 * xattr to change from v2 to v3, or to fixup the v3 rootid. 481 * 482 * If all is ok, we return the new size, on error return < 0. 483 */ 484 int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size) 485 { 486 struct vfs_ns_cap_data *nscap; 487 uid_t nsrootid; 488 const struct vfs_cap_data *cap = *ivalue; 489 __u32 magic, nsmagic; 490 struct inode *inode = d_backing_inode(dentry); 491 struct user_namespace *task_ns = current_user_ns(), 492 *fs_ns = inode->i_sb->s_user_ns; 493 kuid_t rootid; 494 size_t newsize; 495 496 if (!*ivalue) 497 return -EINVAL; 498 if (!validheader(size, cap->magic_etc)) 499 return -EINVAL; 500 if (!capable_wrt_inode_uidgid(inode, CAP_SETFCAP)) 501 return -EPERM; 502 if (size == XATTR_CAPS_SZ_2) 503 if (ns_capable(inode->i_sb->s_user_ns, CAP_SETFCAP)) 504 /* user is privileged, just write the v2 */ 505 return size; 506 507 rootid = rootid_from_xattr(*ivalue, size, task_ns); 508 if (!uid_valid(rootid)) 509 return -EINVAL; 510 511 nsrootid = from_kuid(fs_ns, rootid); 512 if (nsrootid == -1) 513 return -EINVAL; 514 515 newsize = sizeof(struct vfs_ns_cap_data); 516 nscap = kmalloc(newsize, GFP_ATOMIC); 517 if (!nscap) 518 return -ENOMEM; 519 nscap->rootid = cpu_to_le32(nsrootid); 520 nsmagic = VFS_CAP_REVISION_3; 521 magic = le32_to_cpu(cap->magic_etc); 522 if (magic & VFS_CAP_FLAGS_EFFECTIVE) 523 nsmagic |= VFS_CAP_FLAGS_EFFECTIVE; 524 nscap->magic_etc = cpu_to_le32(nsmagic); 525 memcpy(&nscap->data, &cap->data, sizeof(__le32) * 2 * VFS_CAP_U32); 526 527 kvfree(*ivalue); 528 *ivalue = nscap; 529 return newsize; 530 } 531 532 /* 533 * Calculate the new process capability sets from the capability sets attached 534 * to a file. 535 */ 536 static inline int bprm_caps_from_vfs_caps(struct cpu_vfs_cap_data *caps, 537 struct linux_binprm *bprm, 538 bool *effective, 539 bool *has_fcap) 540 { 541 struct cred *new = bprm->cred; 542 unsigned i; 543 int ret = 0; 544 545 if (caps->magic_etc & VFS_CAP_FLAGS_EFFECTIVE) 546 *effective = true; 547 548 if (caps->magic_etc & VFS_CAP_REVISION_MASK) 549 *has_fcap = true; 550 551 CAP_FOR_EACH_U32(i) { 552 __u32 permitted = caps->permitted.cap[i]; 553 __u32 inheritable = caps->inheritable.cap[i]; 554 555 /* 556 * pP' = (X & fP) | (pI & fI) 557 * The addition of pA' is handled later. 558 */ 559 new->cap_permitted.cap[i] = 560 (new->cap_bset.cap[i] & permitted) | 561 (new->cap_inheritable.cap[i] & inheritable); 562 563 if (permitted & ~new->cap_permitted.cap[i]) 564 /* insufficient to execute correctly */ 565 ret = -EPERM; 566 } 567 568 /* 569 * For legacy apps, with no internal support for recognizing they 570 * do not have enough capabilities, we return an error if they are 571 * missing some "forced" (aka file-permitted) capabilities. 572 */ 573 return *effective ? ret : 0; 574 } 575 576 /* 577 * Extract the on-exec-apply capability sets for an executable file. 578 */ 579 int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps) 580 { 581 struct inode *inode = d_backing_inode(dentry); 582 __u32 magic_etc; 583 unsigned tocopy, i; 584 int size; 585 struct vfs_ns_cap_data data, *nscaps = &data; 586 struct vfs_cap_data *caps = (struct vfs_cap_data *) &data; 587 kuid_t rootkuid; 588 struct user_namespace *fs_ns; 589 590 memset(cpu_caps, 0, sizeof(struct cpu_vfs_cap_data)); 591 592 if (!inode) 593 return -ENODATA; 594 595 fs_ns = inode->i_sb->s_user_ns; 596 size = __vfs_getxattr((struct dentry *)dentry, inode, 597 XATTR_NAME_CAPS, &data, XATTR_CAPS_SZ); 598 if (size == -ENODATA || size == -EOPNOTSUPP) 599 /* no data, that's ok */ 600 return -ENODATA; 601 602 if (size < 0) 603 return size; 604 605 if (size < sizeof(magic_etc)) 606 return -EINVAL; 607 608 cpu_caps->magic_etc = magic_etc = le32_to_cpu(caps->magic_etc); 609 610 rootkuid = make_kuid(fs_ns, 0); 611 switch (magic_etc & VFS_CAP_REVISION_MASK) { 612 case VFS_CAP_REVISION_1: 613 if (size != XATTR_CAPS_SZ_1) 614 return -EINVAL; 615 tocopy = VFS_CAP_U32_1; 616 break; 617 case VFS_CAP_REVISION_2: 618 if (size != XATTR_CAPS_SZ_2) 619 return -EINVAL; 620 tocopy = VFS_CAP_U32_2; 621 break; 622 case VFS_CAP_REVISION_3: 623 if (size != XATTR_CAPS_SZ_3) 624 return -EINVAL; 625 tocopy = VFS_CAP_U32_3; 626 rootkuid = make_kuid(fs_ns, le32_to_cpu(nscaps->rootid)); 627 break; 628 629 default: 630 return -EINVAL; 631 } 632 /* Limit the caps to the mounter of the filesystem 633 * or the more limited uid specified in the xattr. 634 */ 635 if (!rootid_owns_currentns(rootkuid)) 636 return -ENODATA; 637 638 CAP_FOR_EACH_U32(i) { 639 if (i >= tocopy) 640 break; 641 cpu_caps->permitted.cap[i] = le32_to_cpu(caps->data[i].permitted); 642 cpu_caps->inheritable.cap[i] = le32_to_cpu(caps->data[i].inheritable); 643 } 644 645 cpu_caps->permitted.cap[CAP_LAST_U32] &= CAP_LAST_U32_VALID_MASK; 646 cpu_caps->inheritable.cap[CAP_LAST_U32] &= CAP_LAST_U32_VALID_MASK; 647 648 return 0; 649 } 650 651 /* 652 * Attempt to get the on-exec apply capability sets for an executable file from 653 * its xattrs and, if present, apply them to the proposed credentials being 654 * constructed by execve(). 655 */ 656 static int get_file_caps(struct linux_binprm *bprm, bool *effective, bool *has_fcap) 657 { 658 int rc = 0; 659 struct cpu_vfs_cap_data vcaps; 660 661 cap_clear(bprm->cred->cap_permitted); 662 663 if (!file_caps_enabled) 664 return 0; 665 666 if (!mnt_may_suid(bprm->file->f_path.mnt)) 667 return 0; 668 669 /* 670 * This check is redundant with mnt_may_suid() but is kept to make 671 * explicit that capability bits are limited to s_user_ns and its 672 * descendants. 673 */ 674 if (!current_in_userns(bprm->file->f_path.mnt->mnt_sb->s_user_ns)) 675 return 0; 676 677 rc = get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps); 678 if (rc < 0) { 679 if (rc == -EINVAL) 680 printk(KERN_NOTICE "Invalid argument reading file caps for %s\n", 681 bprm->filename); 682 else if (rc == -ENODATA) 683 rc = 0; 684 goto out; 685 } 686 687 rc = bprm_caps_from_vfs_caps(&vcaps, bprm, effective, has_fcap); 688 if (rc == -EINVAL) 689 printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n", 690 __func__, rc, bprm->filename); 691 692 out: 693 if (rc) 694 cap_clear(bprm->cred->cap_permitted); 695 696 return rc; 697 } 698 699 static inline bool root_privileged(void) { return !issecure(SECURE_NOROOT); } 700 701 static inline bool __is_real(kuid_t uid, struct cred *cred) 702 { return uid_eq(cred->uid, uid); } 703 704 static inline bool __is_eff(kuid_t uid, struct cred *cred) 705 { return uid_eq(cred->euid, uid); } 706 707 static inline bool __is_suid(kuid_t uid, struct cred *cred) 708 { return !__is_real(uid, cred) && __is_eff(uid, cred); } 709 710 /* 711 * handle_privileged_root - Handle case of privileged root 712 * @bprm: The execution parameters, including the proposed creds 713 * @has_fcap: Are any file capabilities set? 714 * @effective: Do we have effective root privilege? 715 * @root_uid: This namespace' root UID WRT initial USER namespace 716 * 717 * Handle the case where root is privileged and hasn't been neutered by 718 * SECURE_NOROOT. If file capabilities are set, they won't be combined with 719 * set UID root and nothing is changed. If we are root, cap_permitted is 720 * updated. If we have become set UID root, the effective bit is set. 721 */ 722 static void handle_privileged_root(struct linux_binprm *bprm, bool has_fcap, 723 bool *effective, kuid_t root_uid) 724 { 725 const struct cred *old = current_cred(); 726 struct cred *new = bprm->cred; 727 728 if (!root_privileged()) 729 return; 730 /* 731 * If the legacy file capability is set, then don't set privs 732 * for a setuid root binary run by a non-root user. Do set it 733 * for a root user just to cause least surprise to an admin. 734 */ 735 if (has_fcap && __is_suid(root_uid, new)) { 736 warn_setuid_and_fcaps_mixed(bprm->filename); 737 return; 738 } 739 /* 740 * To support inheritance of root-permissions and suid-root 741 * executables under compatibility mode, we override the 742 * capability sets for the file. 743 */ 744 if (__is_eff(root_uid, new) || __is_real(root_uid, new)) { 745 /* pP' = (cap_bset & ~0) | (pI & ~0) */ 746 new->cap_permitted = cap_combine(old->cap_bset, 747 old->cap_inheritable); 748 } 749 /* 750 * If only the real uid is 0, we do not set the effective bit. 751 */ 752 if (__is_eff(root_uid, new)) 753 *effective = true; 754 } 755 756 #define __cap_gained(field, target, source) \ 757 !cap_issubset(target->cap_##field, source->cap_##field) 758 #define __cap_grew(target, source, cred) \ 759 !cap_issubset(cred->cap_##target, cred->cap_##source) 760 #define __cap_full(field, cred) \ 761 cap_issubset(CAP_FULL_SET, cred->cap_##field) 762 763 static inline bool __is_setuid(struct cred *new, const struct cred *old) 764 { return !uid_eq(new->euid, old->uid); } 765 766 static inline bool __is_setgid(struct cred *new, const struct cred *old) 767 { return !gid_eq(new->egid, old->gid); } 768 769 /* 770 * 1) Audit candidate if current->cap_effective is set 771 * 772 * We do not bother to audit if 3 things are true: 773 * 1) cap_effective has all caps 774 * 2) we became root *OR* are were already root 775 * 3) root is supposed to have all caps (SECURE_NOROOT) 776 * Since this is just a normal root execing a process. 777 * 778 * Number 1 above might fail if you don't have a full bset, but I think 779 * that is interesting information to audit. 780 * 781 * A number of other conditions require logging: 782 * 2) something prevented setuid root getting all caps 783 * 3) non-setuid root gets fcaps 784 * 4) non-setuid root gets ambient 785 */ 786 static inline bool nonroot_raised_pE(struct cred *new, const struct cred *old, 787 kuid_t root, bool has_fcap) 788 { 789 bool ret = false; 790 791 if ((__cap_grew(effective, ambient, new) && 792 !(__cap_full(effective, new) && 793 (__is_eff(root, new) || __is_real(root, new)) && 794 root_privileged())) || 795 (root_privileged() && 796 __is_suid(root, new) && 797 !__cap_full(effective, new)) || 798 (!__is_setuid(new, old) && 799 ((has_fcap && 800 __cap_gained(permitted, new, old)) || 801 __cap_gained(ambient, new, old)))) 802 803 ret = true; 804 805 return ret; 806 } 807 808 /** 809 * cap_bprm_set_creds - Set up the proposed credentials for execve(). 810 * @bprm: The execution parameters, including the proposed creds 811 * 812 * Set up the proposed credentials for a new execution context being 813 * constructed by execve(). The proposed creds in @bprm->cred is altered, 814 * which won't take effect immediately. Returns 0 if successful, -ve on error. 815 */ 816 int cap_bprm_set_creds(struct linux_binprm *bprm) 817 { 818 const struct cred *old = current_cred(); 819 struct cred *new = bprm->cred; 820 bool effective = false, has_fcap = false, is_setid; 821 int ret; 822 kuid_t root_uid; 823 824 if (WARN_ON(!cap_ambient_invariant_ok(old))) 825 return -EPERM; 826 827 ret = get_file_caps(bprm, &effective, &has_fcap); 828 if (ret < 0) 829 return ret; 830 831 root_uid = make_kuid(new->user_ns, 0); 832 833 handle_privileged_root(bprm, has_fcap, &effective, root_uid); 834 835 /* if we have fs caps, clear dangerous personality flags */ 836 if (__cap_gained(permitted, new, old)) 837 bprm->per_clear |= PER_CLEAR_ON_SETID; 838 839 /* Don't let someone trace a set[ug]id/setpcap binary with the revised 840 * credentials unless they have the appropriate permit. 841 * 842 * In addition, if NO_NEW_PRIVS, then ensure we get no new privs. 843 */ 844 is_setid = __is_setuid(new, old) || __is_setgid(new, old); 845 846 if ((is_setid || __cap_gained(permitted, new, old)) && 847 ((bprm->unsafe & ~LSM_UNSAFE_PTRACE) || 848 !ptracer_capable(current, new->user_ns))) { 849 /* downgrade; they get no more than they had, and maybe less */ 850 if (!ns_capable(new->user_ns, CAP_SETUID) || 851 (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)) { 852 new->euid = new->uid; 853 new->egid = new->gid; 854 } 855 new->cap_permitted = cap_intersect(new->cap_permitted, 856 old->cap_permitted); 857 } 858 859 new->suid = new->fsuid = new->euid; 860 new->sgid = new->fsgid = new->egid; 861 862 /* File caps or setid cancels ambient. */ 863 if (has_fcap || is_setid) 864 cap_clear(new->cap_ambient); 865 866 /* 867 * Now that we've computed pA', update pP' to give: 868 * pP' = (X & fP) | (pI & fI) | pA' 869 */ 870 new->cap_permitted = cap_combine(new->cap_permitted, new->cap_ambient); 871 872 /* 873 * Set pE' = (fE ? pP' : pA'). Because pA' is zero if fE is set, 874 * this is the same as pE' = (fE ? pP' : 0) | pA'. 875 */ 876 if (effective) 877 new->cap_effective = new->cap_permitted; 878 else 879 new->cap_effective = new->cap_ambient; 880 881 if (WARN_ON(!cap_ambient_invariant_ok(new))) 882 return -EPERM; 883 884 if (nonroot_raised_pE(new, old, root_uid, has_fcap)) { 885 ret = audit_log_bprm_fcaps(bprm, new, old); 886 if (ret < 0) 887 return ret; 888 } 889 890 new->securebits &= ~issecure_mask(SECURE_KEEP_CAPS); 891 892 if (WARN_ON(!cap_ambient_invariant_ok(new))) 893 return -EPERM; 894 895 /* Check for privilege-elevated exec. */ 896 bprm->cap_elevated = 0; 897 if (is_setid || 898 (!__is_real(root_uid, new) && 899 (effective || 900 __cap_grew(permitted, ambient, new)))) 901 bprm->cap_elevated = 1; 902 903 return 0; 904 } 905 906 /** 907 * cap_inode_setxattr - Determine whether an xattr may be altered 908 * @dentry: The inode/dentry being altered 909 * @name: The name of the xattr to be changed 910 * @value: The value that the xattr will be changed to 911 * @size: The size of value 912 * @flags: The replacement flag 913 * 914 * Determine whether an xattr may be altered or set on an inode, returning 0 if 915 * permission is granted, -ve if denied. 916 * 917 * This is used to make sure security xattrs don't get updated or set by those 918 * who aren't privileged to do so. 919 */ 920 int cap_inode_setxattr(struct dentry *dentry, const char *name, 921 const void *value, size_t size, int flags) 922 { 923 /* Ignore non-security xattrs */ 924 if (strncmp(name, XATTR_SECURITY_PREFIX, 925 sizeof(XATTR_SECURITY_PREFIX) - 1) != 0) 926 return 0; 927 928 /* 929 * For XATTR_NAME_CAPS the check will be done in 930 * cap_convert_nscap(), called by setxattr() 931 */ 932 if (strcmp(name, XATTR_NAME_CAPS) == 0) 933 return 0; 934 935 if (!capable(CAP_SYS_ADMIN)) 936 return -EPERM; 937 return 0; 938 } 939 940 /** 941 * cap_inode_removexattr - Determine whether an xattr may be removed 942 * @dentry: The inode/dentry being altered 943 * @name: The name of the xattr to be changed 944 * 945 * Determine whether an xattr may be removed from an inode, returning 0 if 946 * permission is granted, -ve if denied. 947 * 948 * This is used to make sure security xattrs don't get removed by those who 949 * aren't privileged to remove them. 950 */ 951 int cap_inode_removexattr(struct dentry *dentry, const char *name) 952 { 953 /* Ignore non-security xattrs */ 954 if (strncmp(name, XATTR_SECURITY_PREFIX, 955 sizeof(XATTR_SECURITY_PREFIX) - 1) != 0) 956 return 0; 957 958 if (strcmp(name, XATTR_NAME_CAPS) == 0) { 959 /* security.capability gets namespaced */ 960 struct inode *inode = d_backing_inode(dentry); 961 if (!inode) 962 return -EINVAL; 963 if (!capable_wrt_inode_uidgid(inode, CAP_SETFCAP)) 964 return -EPERM; 965 return 0; 966 } 967 968 if (!capable(CAP_SYS_ADMIN)) 969 return -EPERM; 970 return 0; 971 } 972 973 /* 974 * cap_emulate_setxuid() fixes the effective / permitted capabilities of 975 * a process after a call to setuid, setreuid, or setresuid. 976 * 977 * 1) When set*uiding _from_ one of {r,e,s}uid == 0 _to_ all of 978 * {r,e,s}uid != 0, the permitted and effective capabilities are 979 * cleared. 980 * 981 * 2) When set*uiding _from_ euid == 0 _to_ euid != 0, the effective 982 * capabilities of the process are cleared. 983 * 984 * 3) When set*uiding _from_ euid != 0 _to_ euid == 0, the effective 985 * capabilities are set to the permitted capabilities. 986 * 987 * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should 988 * never happen. 989 * 990 * -astor 991 * 992 * cevans - New behaviour, Oct '99 993 * A process may, via prctl(), elect to keep its capabilities when it 994 * calls setuid() and switches away from uid==0. Both permitted and 995 * effective sets will be retained. 996 * Without this change, it was impossible for a daemon to drop only some 997 * of its privilege. The call to setuid(!=0) would drop all privileges! 998 * Keeping uid 0 is not an option because uid 0 owns too many vital 999 * files.. 1000 * Thanks to Olaf Kirch and Peter Benie for spotting this. 1001 */ 1002 static inline void cap_emulate_setxuid(struct cred *new, const struct cred *old) 1003 { 1004 kuid_t root_uid = make_kuid(old->user_ns, 0); 1005 1006 if ((uid_eq(old->uid, root_uid) || 1007 uid_eq(old->euid, root_uid) || 1008 uid_eq(old->suid, root_uid)) && 1009 (!uid_eq(new->uid, root_uid) && 1010 !uid_eq(new->euid, root_uid) && 1011 !uid_eq(new->suid, root_uid))) { 1012 if (!issecure(SECURE_KEEP_CAPS)) { 1013 cap_clear(new->cap_permitted); 1014 cap_clear(new->cap_effective); 1015 } 1016 1017 /* 1018 * Pre-ambient programs expect setresuid to nonroot followed 1019 * by exec to drop capabilities. We should make sure that 1020 * this remains the case. 1021 */ 1022 cap_clear(new->cap_ambient); 1023 } 1024 if (uid_eq(old->euid, root_uid) && !uid_eq(new->euid, root_uid)) 1025 cap_clear(new->cap_effective); 1026 if (!uid_eq(old->euid, root_uid) && uid_eq(new->euid, root_uid)) 1027 new->cap_effective = new->cap_permitted; 1028 } 1029 1030 /** 1031 * cap_task_fix_setuid - Fix up the results of setuid() call 1032 * @new: The proposed credentials 1033 * @old: The current task's current credentials 1034 * @flags: Indications of what has changed 1035 * 1036 * Fix up the results of setuid() call before the credential changes are 1037 * actually applied, returning 0 to grant the changes, -ve to deny them. 1038 */ 1039 int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags) 1040 { 1041 switch (flags) { 1042 case LSM_SETID_RE: 1043 case LSM_SETID_ID: 1044 case LSM_SETID_RES: 1045 /* juggle the capabilities to follow [RES]UID changes unless 1046 * otherwise suppressed */ 1047 if (!issecure(SECURE_NO_SETUID_FIXUP)) 1048 cap_emulate_setxuid(new, old); 1049 break; 1050 1051 case LSM_SETID_FS: 1052 /* juggle the capabilties to follow FSUID changes, unless 1053 * otherwise suppressed 1054 * 1055 * FIXME - is fsuser used for all CAP_FS_MASK capabilities? 1056 * if not, we might be a bit too harsh here. 1057 */ 1058 if (!issecure(SECURE_NO_SETUID_FIXUP)) { 1059 kuid_t root_uid = make_kuid(old->user_ns, 0); 1060 if (uid_eq(old->fsuid, root_uid) && !uid_eq(new->fsuid, root_uid)) 1061 new->cap_effective = 1062 cap_drop_fs_set(new->cap_effective); 1063 1064 if (!uid_eq(old->fsuid, root_uid) && uid_eq(new->fsuid, root_uid)) 1065 new->cap_effective = 1066 cap_raise_fs_set(new->cap_effective, 1067 new->cap_permitted); 1068 } 1069 break; 1070 1071 default: 1072 return -EINVAL; 1073 } 1074 1075 return 0; 1076 } 1077 1078 /* 1079 * Rationale: code calling task_setscheduler, task_setioprio, and 1080 * task_setnice, assumes that 1081 * . if capable(cap_sys_nice), then those actions should be allowed 1082 * . if not capable(cap_sys_nice), but acting on your own processes, 1083 * then those actions should be allowed 1084 * This is insufficient now since you can call code without suid, but 1085 * yet with increased caps. 1086 * So we check for increased caps on the target process. 1087 */ 1088 static int cap_safe_nice(struct task_struct *p) 1089 { 1090 int is_subset, ret = 0; 1091 1092 rcu_read_lock(); 1093 is_subset = cap_issubset(__task_cred(p)->cap_permitted, 1094 current_cred()->cap_permitted); 1095 if (!is_subset && !ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) 1096 ret = -EPERM; 1097 rcu_read_unlock(); 1098 1099 return ret; 1100 } 1101 1102 /** 1103 * cap_task_setscheduler - Detemine if scheduler policy change is permitted 1104 * @p: The task to affect 1105 * 1106 * Detemine if the requested scheduler policy change is permitted for the 1107 * specified task, returning 0 if permission is granted, -ve if denied. 1108 */ 1109 int cap_task_setscheduler(struct task_struct *p) 1110 { 1111 return cap_safe_nice(p); 1112 } 1113 1114 /** 1115 * cap_task_ioprio - Detemine if I/O priority change is permitted 1116 * @p: The task to affect 1117 * @ioprio: The I/O priority to set 1118 * 1119 * Detemine if the requested I/O priority change is permitted for the specified 1120 * task, returning 0 if permission is granted, -ve if denied. 1121 */ 1122 int cap_task_setioprio(struct task_struct *p, int ioprio) 1123 { 1124 return cap_safe_nice(p); 1125 } 1126 1127 /** 1128 * cap_task_ioprio - Detemine if task priority change is permitted 1129 * @p: The task to affect 1130 * @nice: The nice value to set 1131 * 1132 * Detemine if the requested task priority change is permitted for the 1133 * specified task, returning 0 if permission is granted, -ve if denied. 1134 */ 1135 int cap_task_setnice(struct task_struct *p, int nice) 1136 { 1137 return cap_safe_nice(p); 1138 } 1139 1140 /* 1141 * Implement PR_CAPBSET_DROP. Attempt to remove the specified capability from 1142 * the current task's bounding set. Returns 0 on success, -ve on error. 1143 */ 1144 static int cap_prctl_drop(unsigned long cap) 1145 { 1146 struct cred *new; 1147 1148 if (!ns_capable(current_user_ns(), CAP_SETPCAP)) 1149 return -EPERM; 1150 if (!cap_valid(cap)) 1151 return -EINVAL; 1152 1153 new = prepare_creds(); 1154 if (!new) 1155 return -ENOMEM; 1156 cap_lower(new->cap_bset, cap); 1157 return commit_creds(new); 1158 } 1159 1160 /** 1161 * cap_task_prctl - Implement process control functions for this security module 1162 * @option: The process control function requested 1163 * @arg2, @arg3, @arg4, @arg5: The argument data for this function 1164 * 1165 * Allow process control functions (sys_prctl()) to alter capabilities; may 1166 * also deny access to other functions not otherwise implemented here. 1167 * 1168 * Returns 0 or +ve on success, -ENOSYS if this function is not implemented 1169 * here, other -ve on error. If -ENOSYS is returned, sys_prctl() and other LSM 1170 * modules will consider performing the function. 1171 */ 1172 int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3, 1173 unsigned long arg4, unsigned long arg5) 1174 { 1175 const struct cred *old = current_cred(); 1176 struct cred *new; 1177 1178 switch (option) { 1179 case PR_CAPBSET_READ: 1180 if (!cap_valid(arg2)) 1181 return -EINVAL; 1182 return !!cap_raised(old->cap_bset, arg2); 1183 1184 case PR_CAPBSET_DROP: 1185 return cap_prctl_drop(arg2); 1186 1187 /* 1188 * The next four prctl's remain to assist with transitioning a 1189 * system from legacy UID=0 based privilege (when filesystem 1190 * capabilities are not in use) to a system using filesystem 1191 * capabilities only - as the POSIX.1e draft intended. 1192 * 1193 * Note: 1194 * 1195 * PR_SET_SECUREBITS = 1196 * issecure_mask(SECURE_KEEP_CAPS_LOCKED) 1197 * | issecure_mask(SECURE_NOROOT) 1198 * | issecure_mask(SECURE_NOROOT_LOCKED) 1199 * | issecure_mask(SECURE_NO_SETUID_FIXUP) 1200 * | issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED) 1201 * 1202 * will ensure that the current process and all of its 1203 * children will be locked into a pure 1204 * capability-based-privilege environment. 1205 */ 1206 case PR_SET_SECUREBITS: 1207 if ((((old->securebits & SECURE_ALL_LOCKS) >> 1) 1208 & (old->securebits ^ arg2)) /*[1]*/ 1209 || ((old->securebits & SECURE_ALL_LOCKS & ~arg2)) /*[2]*/ 1210 || (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/ 1211 || (cap_capable(current_cred(), 1212 current_cred()->user_ns, CAP_SETPCAP, 1213 SECURITY_CAP_AUDIT) != 0) /*[4]*/ 1214 /* 1215 * [1] no changing of bits that are locked 1216 * [2] no unlocking of locks 1217 * [3] no setting of unsupported bits 1218 * [4] doing anything requires privilege (go read about 1219 * the "sendmail capabilities bug") 1220 */ 1221 ) 1222 /* cannot change a locked bit */ 1223 return -EPERM; 1224 1225 new = prepare_creds(); 1226 if (!new) 1227 return -ENOMEM; 1228 new->securebits = arg2; 1229 return commit_creds(new); 1230 1231 case PR_GET_SECUREBITS: 1232 return old->securebits; 1233 1234 case PR_GET_KEEPCAPS: 1235 return !!issecure(SECURE_KEEP_CAPS); 1236 1237 case PR_SET_KEEPCAPS: 1238 if (arg2 > 1) /* Note, we rely on arg2 being unsigned here */ 1239 return -EINVAL; 1240 if (issecure(SECURE_KEEP_CAPS_LOCKED)) 1241 return -EPERM; 1242 1243 new = prepare_creds(); 1244 if (!new) 1245 return -ENOMEM; 1246 if (arg2) 1247 new->securebits |= issecure_mask(SECURE_KEEP_CAPS); 1248 else 1249 new->securebits &= ~issecure_mask(SECURE_KEEP_CAPS); 1250 return commit_creds(new); 1251 1252 case PR_CAP_AMBIENT: 1253 if (arg2 == PR_CAP_AMBIENT_CLEAR_ALL) { 1254 if (arg3 | arg4 | arg5) 1255 return -EINVAL; 1256 1257 new = prepare_creds(); 1258 if (!new) 1259 return -ENOMEM; 1260 cap_clear(new->cap_ambient); 1261 return commit_creds(new); 1262 } 1263 1264 if (((!cap_valid(arg3)) | arg4 | arg5)) 1265 return -EINVAL; 1266 1267 if (arg2 == PR_CAP_AMBIENT_IS_SET) { 1268 return !!cap_raised(current_cred()->cap_ambient, arg3); 1269 } else if (arg2 != PR_CAP_AMBIENT_RAISE && 1270 arg2 != PR_CAP_AMBIENT_LOWER) { 1271 return -EINVAL; 1272 } else { 1273 if (arg2 == PR_CAP_AMBIENT_RAISE && 1274 (!cap_raised(current_cred()->cap_permitted, arg3) || 1275 !cap_raised(current_cred()->cap_inheritable, 1276 arg3) || 1277 issecure(SECURE_NO_CAP_AMBIENT_RAISE))) 1278 return -EPERM; 1279 1280 new = prepare_creds(); 1281 if (!new) 1282 return -ENOMEM; 1283 if (arg2 == PR_CAP_AMBIENT_RAISE) 1284 cap_raise(new->cap_ambient, arg3); 1285 else 1286 cap_lower(new->cap_ambient, arg3); 1287 return commit_creds(new); 1288 } 1289 1290 default: 1291 /* No functionality available - continue with default */ 1292 return -ENOSYS; 1293 } 1294 } 1295 1296 /** 1297 * cap_vm_enough_memory - Determine whether a new virtual mapping is permitted 1298 * @mm: The VM space in which the new mapping is to be made 1299 * @pages: The size of the mapping 1300 * 1301 * Determine whether the allocation of a new virtual mapping by the current 1302 * task is permitted, returning 1 if permission is granted, 0 if not. 1303 */ 1304 int cap_vm_enough_memory(struct mm_struct *mm, long pages) 1305 { 1306 int cap_sys_admin = 0; 1307 1308 if (cap_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN, 1309 SECURITY_CAP_NOAUDIT) == 0) 1310 cap_sys_admin = 1; 1311 return cap_sys_admin; 1312 } 1313 1314 /* 1315 * cap_mmap_addr - check if able to map given addr 1316 * @addr: address attempting to be mapped 1317 * 1318 * If the process is attempting to map memory below dac_mmap_min_addr they need 1319 * CAP_SYS_RAWIO. The other parameters to this function are unused by the 1320 * capability security module. Returns 0 if this mapping should be allowed 1321 * -EPERM if not. 1322 */ 1323 int cap_mmap_addr(unsigned long addr) 1324 { 1325 int ret = 0; 1326 1327 if (addr < dac_mmap_min_addr) { 1328 ret = cap_capable(current_cred(), &init_user_ns, CAP_SYS_RAWIO, 1329 SECURITY_CAP_AUDIT); 1330 /* set PF_SUPERPRIV if it turns out we allow the low mmap */ 1331 if (ret == 0) 1332 current->flags |= PF_SUPERPRIV; 1333 } 1334 return ret; 1335 } 1336 1337 int cap_mmap_file(struct file *file, unsigned long reqprot, 1338 unsigned long prot, unsigned long flags) 1339 { 1340 return 0; 1341 } 1342 1343 #ifdef CONFIG_SECURITY 1344 1345 struct security_hook_list capability_hooks[] __lsm_ro_after_init = { 1346 LSM_HOOK_INIT(capable, cap_capable), 1347 LSM_HOOK_INIT(settime, cap_settime), 1348 LSM_HOOK_INIT(ptrace_access_check, cap_ptrace_access_check), 1349 LSM_HOOK_INIT(ptrace_traceme, cap_ptrace_traceme), 1350 LSM_HOOK_INIT(capget, cap_capget), 1351 LSM_HOOK_INIT(capset, cap_capset), 1352 LSM_HOOK_INIT(bprm_set_creds, cap_bprm_set_creds), 1353 LSM_HOOK_INIT(inode_need_killpriv, cap_inode_need_killpriv), 1354 LSM_HOOK_INIT(inode_killpriv, cap_inode_killpriv), 1355 LSM_HOOK_INIT(inode_getsecurity, cap_inode_getsecurity), 1356 LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), 1357 LSM_HOOK_INIT(mmap_file, cap_mmap_file), 1358 LSM_HOOK_INIT(task_fix_setuid, cap_task_fix_setuid), 1359 LSM_HOOK_INIT(task_prctl, cap_task_prctl), 1360 LSM_HOOK_INIT(task_setscheduler, cap_task_setscheduler), 1361 LSM_HOOK_INIT(task_setioprio, cap_task_setioprio), 1362 LSM_HOOK_INIT(task_setnice, cap_task_setnice), 1363 LSM_HOOK_INIT(vm_enough_memory, cap_vm_enough_memory), 1364 }; 1365 1366 void __init capability_add_hooks(void) 1367 { 1368 security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks), 1369 "capability"); 1370 } 1371 1372 #endif /* CONFIG_SECURITY */ 1373