1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/fs/ioctl.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 */ 7 8#include <linux/syscalls.h> 9#include <linux/mm.h> 10#include <linux/capability.h> 11#include <linux/compat.h> 12#include <linux/file.h> 13#include <linux/fs.h> 14#include <linux/security.h> 15#include <linux/export.h> 16#include <linux/uaccess.h> 17#include <linux/writeback.h> 18#include <linux/buffer_head.h> 19#include <linux/falloc.h> 20#include <linux/sched/signal.h> 21#include <linux/fiemap.h> 22#include <linux/mount.h> 23#include <linux/fscrypt.h> 24#include <linux/fileattr.h> 25 26#include "internal.h" 27 28#include <asm/ioctls.h> 29 30/* So that the fiemap access checks can't overflow on 32 bit machines. */ 31#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) 32 33/** 34 * vfs_ioctl - call filesystem specific ioctl methods 35 * @filp: open file to invoke ioctl method on 36 * @cmd: ioctl command to execute 37 * @arg: command-specific argument for ioctl 38 * 39 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise 40 * returns -ENOTTY. 41 * 42 * Returns 0 on success, -errno on error. 43 */ 44long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 45{ 46 int error = -ENOTTY; 47 48 if (!filp->f_op->unlocked_ioctl) 49 goto out; 50 51 error = filp->f_op->unlocked_ioctl(filp, cmd, arg); 52 if (error == -ENOIOCTLCMD) 53 error = -ENOTTY; 54 out: 55 return error; 56} 57EXPORT_SYMBOL(vfs_ioctl); 58 59static int ioctl_fibmap(struct file *filp, int __user *p) 60{ 61 struct inode *inode = file_inode(filp); 62 struct super_block *sb = inode->i_sb; 63 int error, ur_block; 64 sector_t block; 65 66 if (!capable(CAP_SYS_RAWIO)) 67 return -EPERM; 68 69 error = get_user(ur_block, p); 70 if (error) 71 return error; 72 73 if (ur_block < 0) 74 return -EINVAL; 75 76 block = ur_block; 77 error = bmap(inode, &block); 78 79 if (block > INT_MAX) { 80 error = -ERANGE; 81 pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n", 82 current->comm, task_pid_nr(current), 83 sb->s_id, filp); 84 } 85 86 if (error) 87 ur_block = 0; 88 else 89 ur_block = block; 90 91 if (put_user(ur_block, p)) 92 error = -EFAULT; 93 94 return error; 95} 96 97/** 98 * fiemap_fill_next_extent - Fiemap helper function 99 * @fieinfo: Fiemap context passed into ->fiemap 100 * @logical: Extent logical start offset, in bytes 101 * @phys: Extent physical start offset, in bytes 102 * @len: Extent length, in bytes 103 * @flags: FIEMAP_EXTENT flags that describe this extent 104 * 105 * Called from file system ->fiemap callback. Will populate extent 106 * info as passed in via arguments and copy to user memory. On 107 * success, extent count on fieinfo is incremented. 108 * 109 * Returns 0 on success, -errno on error, 1 if this was the last 110 * extent that will fit in user array. 111 */ 112int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical, 113 u64 phys, u64 len, u32 flags) 114{ 115 struct fiemap_extent extent; 116 struct fiemap_extent __user *dest = fieinfo->fi_extents_start; 117 118 /* only count the extents */ 119 if (fieinfo->fi_extents_max == 0) { 120 fieinfo->fi_extents_mapped++; 121 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; 122 } 123 124 if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max) 125 return 1; 126 127#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC) 128#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED) 129#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE) 130 131 if (flags & SET_UNKNOWN_FLAGS) 132 flags |= FIEMAP_EXTENT_UNKNOWN; 133 if (flags & SET_NO_UNMOUNTED_IO_FLAGS) 134 flags |= FIEMAP_EXTENT_ENCODED; 135 if (flags & SET_NOT_ALIGNED_FLAGS) 136 flags |= FIEMAP_EXTENT_NOT_ALIGNED; 137 138 memset(&extent, 0, sizeof(extent)); 139 extent.fe_logical = logical; 140 extent.fe_physical = phys; 141 extent.fe_length = len; 142 extent.fe_flags = flags; 143 144 dest += fieinfo->fi_extents_mapped; 145 if (copy_to_user(dest, &extent, sizeof(extent))) 146 return -EFAULT; 147 148 fieinfo->fi_extents_mapped++; 149 if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max) 150 return 1; 151 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; 152} 153EXPORT_SYMBOL(fiemap_fill_next_extent); 154 155/** 156 * fiemap_prep - check validity of requested flags for fiemap 157 * @inode: Inode to operate on 158 * @fieinfo: Fiemap context passed into ->fiemap 159 * @start: Start of the mapped range 160 * @len: Length of the mapped range, can be truncated by this function. 161 * @supported_flags: Set of fiemap flags that the file system understands 162 * 163 * This function must be called from each ->fiemap instance to validate the 164 * fiemap request against the file system parameters. 165 * 166 * Returns 0 on success, or a negative error on failure. 167 */ 168int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo, 169 u64 start, u64 *len, u32 supported_flags) 170{ 171 u64 maxbytes = inode->i_sb->s_maxbytes; 172 u32 incompat_flags; 173 int ret = 0; 174 175 if (*len == 0) 176 return -EINVAL; 177 if (start >= maxbytes) 178 return -EFBIG; 179 180 /* 181 * Shrink request scope to what the fs can actually handle. 182 */ 183 if (*len > maxbytes || (maxbytes - *len) < start) 184 *len = maxbytes - start; 185 186 supported_flags |= FIEMAP_FLAG_SYNC; 187 supported_flags &= FIEMAP_FLAGS_COMPAT; 188 incompat_flags = fieinfo->fi_flags & ~supported_flags; 189 if (incompat_flags) { 190 fieinfo->fi_flags = incompat_flags; 191 return -EBADR; 192 } 193 194 if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC) 195 ret = filemap_write_and_wait(inode->i_mapping); 196 return ret; 197} 198EXPORT_SYMBOL(fiemap_prep); 199 200static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap) 201{ 202 struct fiemap fiemap; 203 struct fiemap_extent_info fieinfo = { 0, }; 204 struct inode *inode = file_inode(filp); 205 int error; 206 207 if (!inode->i_op->fiemap) 208 return -EOPNOTSUPP; 209 210 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) 211 return -EFAULT; 212 213 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) 214 return -EINVAL; 215 216 fieinfo.fi_flags = fiemap.fm_flags; 217 fieinfo.fi_extents_max = fiemap.fm_extent_count; 218 fieinfo.fi_extents_start = ufiemap->fm_extents; 219 220 error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, 221 fiemap.fm_length); 222 223 fiemap.fm_flags = fieinfo.fi_flags; 224 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; 225 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) 226 error = -EFAULT; 227 228 return error; 229} 230 231static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd, 232 u64 off, u64 olen, u64 destoff) 233{ 234 struct fd src_file = fdget(srcfd); 235 loff_t cloned; 236 int ret; 237 238 if (!src_file.file) 239 return -EBADF; 240 cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff, 241 olen, 0); 242 if (cloned < 0) 243 ret = cloned; 244 else if (olen && cloned != olen) 245 ret = -EINVAL; 246 else 247 ret = 0; 248 fdput(src_file); 249 return ret; 250} 251 252static long ioctl_file_clone_range(struct file *file, 253 struct file_clone_range __user *argp) 254{ 255 struct file_clone_range args; 256 257 if (copy_from_user(&args, argp, sizeof(args))) 258 return -EFAULT; 259 return ioctl_file_clone(file, args.src_fd, args.src_offset, 260 args.src_length, args.dest_offset); 261} 262 263/* 264 * This provides compatibility with legacy XFS pre-allocation ioctls 265 * which predate the fallocate syscall. 266 * 267 * Only the l_start, l_len and l_whence fields of the 'struct space_resv' 268 * are used here, rest are ignored. 269 */ 270static int ioctl_preallocate(struct file *filp, int mode, void __user *argp) 271{ 272 struct inode *inode = file_inode(filp); 273 struct space_resv sr; 274 275 if (copy_from_user(&sr, argp, sizeof(sr))) 276 return -EFAULT; 277 278 switch (sr.l_whence) { 279 case SEEK_SET: 280 break; 281 case SEEK_CUR: 282 sr.l_start += filp->f_pos; 283 break; 284 case SEEK_END: 285 sr.l_start += i_size_read(inode); 286 break; 287 default: 288 return -EINVAL; 289 } 290 291 return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, 292 sr.l_len); 293} 294 295/* on ia32 l_start is on a 32-bit boundary */ 296#if defined CONFIG_COMPAT && defined(CONFIG_X86_64) 297/* just account for different alignment */ 298static int compat_ioctl_preallocate(struct file *file, int mode, 299 struct space_resv_32 __user *argp) 300{ 301 struct inode *inode = file_inode(file); 302 struct space_resv_32 sr; 303 304 if (copy_from_user(&sr, argp, sizeof(sr))) 305 return -EFAULT; 306 307 switch (sr.l_whence) { 308 case SEEK_SET: 309 break; 310 case SEEK_CUR: 311 sr.l_start += file->f_pos; 312 break; 313 case SEEK_END: 314 sr.l_start += i_size_read(inode); 315 break; 316 default: 317 return -EINVAL; 318 } 319 320 return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len); 321} 322#endif 323 324static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p) 325{ 326 switch (cmd) { 327 case FIBMAP: 328 return ioctl_fibmap(filp, p); 329 case FS_IOC_RESVSP: 330 case FS_IOC_RESVSP64: 331 return ioctl_preallocate(filp, 0, p); 332 case FS_IOC_UNRESVSP: 333 case FS_IOC_UNRESVSP64: 334 return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p); 335 case FS_IOC_ZERO_RANGE: 336 return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p); 337 } 338 339 return -ENOIOCTLCMD; 340} 341 342static int ioctl_fionbio(struct file *filp, int __user *argp) 343{ 344 unsigned int flag; 345 int on, error; 346 347 error = get_user(on, argp); 348 if (error) 349 return error; 350 flag = O_NONBLOCK; 351#ifdef __sparc__ 352 /* SunOS compatibility item. */ 353 if (O_NONBLOCK != O_NDELAY) 354 flag |= O_NDELAY; 355#endif 356 spin_lock(&filp->f_lock); 357 if (on) 358 filp->f_flags |= flag; 359 else 360 filp->f_flags &= ~flag; 361 spin_unlock(&filp->f_lock); 362 return error; 363} 364 365static int ioctl_fioasync(unsigned int fd, struct file *filp, 366 int __user *argp) 367{ 368 unsigned int flag; 369 int on, error; 370 371 error = get_user(on, argp); 372 if (error) 373 return error; 374 flag = on ? FASYNC : 0; 375 376 /* Did FASYNC state change ? */ 377 if ((flag ^ filp->f_flags) & FASYNC) { 378 if (filp->f_op->fasync) 379 /* fasync() adjusts filp->f_flags */ 380 error = filp->f_op->fasync(fd, filp, on); 381 else 382 error = -ENOTTY; 383 } 384 return error < 0 ? error : 0; 385} 386 387static int ioctl_fsfreeze(struct file *filp) 388{ 389 struct super_block *sb = file_inode(filp)->i_sb; 390 391 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) 392 return -EPERM; 393 394 /* If filesystem doesn't support freeze feature, return. */ 395 if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL) 396 return -EOPNOTSUPP; 397 398 /* Freeze */ 399 if (sb->s_op->freeze_super) 400 return sb->s_op->freeze_super(sb, FREEZE_HOLDER_USERSPACE); 401 return freeze_super(sb, FREEZE_HOLDER_USERSPACE); 402} 403 404static int ioctl_fsthaw(struct file *filp) 405{ 406 struct super_block *sb = file_inode(filp)->i_sb; 407 408 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) 409 return -EPERM; 410 411 /* Thaw */ 412 if (sb->s_op->thaw_super) 413 return sb->s_op->thaw_super(sb, FREEZE_HOLDER_USERSPACE); 414 return thaw_super(sb, FREEZE_HOLDER_USERSPACE); 415} 416 417static int ioctl_file_dedupe_range(struct file *file, 418 struct file_dedupe_range __user *argp) 419{ 420 struct file_dedupe_range *same = NULL; 421 int ret; 422 unsigned long size; 423 u16 count; 424 425 if (get_user(count, &argp->dest_count)) { 426 ret = -EFAULT; 427 goto out; 428 } 429 430 size = offsetof(struct file_dedupe_range, info[count]); 431 if (size > PAGE_SIZE) { 432 ret = -ENOMEM; 433 goto out; 434 } 435 436 same = memdup_user(argp, size); 437 if (IS_ERR(same)) { 438 ret = PTR_ERR(same); 439 same = NULL; 440 goto out; 441 } 442 443 same->dest_count = count; 444 ret = vfs_dedupe_file_range(file, same); 445 if (ret) 446 goto out; 447 448 ret = copy_to_user(argp, same, size); 449 if (ret) 450 ret = -EFAULT; 451 452out: 453 kfree(same); 454 return ret; 455} 456 457/** 458 * fileattr_fill_xflags - initialize fileattr with xflags 459 * @fa: fileattr pointer 460 * @xflags: FS_XFLAG_* flags 461 * 462 * Set ->fsx_xflags, ->fsx_valid and ->flags (translated xflags). All 463 * other fields are zeroed. 464 */ 465void fileattr_fill_xflags(struct fileattr *fa, u32 xflags) 466{ 467 memset(fa, 0, sizeof(*fa)); 468 fa->fsx_valid = true; 469 fa->fsx_xflags = xflags; 470 if (fa->fsx_xflags & FS_XFLAG_IMMUTABLE) 471 fa->flags |= FS_IMMUTABLE_FL; 472 if (fa->fsx_xflags & FS_XFLAG_APPEND) 473 fa->flags |= FS_APPEND_FL; 474 if (fa->fsx_xflags & FS_XFLAG_SYNC) 475 fa->flags |= FS_SYNC_FL; 476 if (fa->fsx_xflags & FS_XFLAG_NOATIME) 477 fa->flags |= FS_NOATIME_FL; 478 if (fa->fsx_xflags & FS_XFLAG_NODUMP) 479 fa->flags |= FS_NODUMP_FL; 480 if (fa->fsx_xflags & FS_XFLAG_DAX) 481 fa->flags |= FS_DAX_FL; 482 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT) 483 fa->flags |= FS_PROJINHERIT_FL; 484} 485EXPORT_SYMBOL(fileattr_fill_xflags); 486 487/** 488 * fileattr_fill_flags - initialize fileattr with flags 489 * @fa: fileattr pointer 490 * @flags: FS_*_FL flags 491 * 492 * Set ->flags, ->flags_valid and ->fsx_xflags (translated flags). 493 * All other fields are zeroed. 494 */ 495void fileattr_fill_flags(struct fileattr *fa, u32 flags) 496{ 497 memset(fa, 0, sizeof(*fa)); 498 fa->flags_valid = true; 499 fa->flags = flags; 500 if (fa->flags & FS_SYNC_FL) 501 fa->fsx_xflags |= FS_XFLAG_SYNC; 502 if (fa->flags & FS_IMMUTABLE_FL) 503 fa->fsx_xflags |= FS_XFLAG_IMMUTABLE; 504 if (fa->flags & FS_APPEND_FL) 505 fa->fsx_xflags |= FS_XFLAG_APPEND; 506 if (fa->flags & FS_NODUMP_FL) 507 fa->fsx_xflags |= FS_XFLAG_NODUMP; 508 if (fa->flags & FS_NOATIME_FL) 509 fa->fsx_xflags |= FS_XFLAG_NOATIME; 510 if (fa->flags & FS_DAX_FL) 511 fa->fsx_xflags |= FS_XFLAG_DAX; 512 if (fa->flags & FS_PROJINHERIT_FL) 513 fa->fsx_xflags |= FS_XFLAG_PROJINHERIT; 514} 515EXPORT_SYMBOL(fileattr_fill_flags); 516 517/** 518 * vfs_fileattr_get - retrieve miscellaneous file attributes 519 * @dentry: the object to retrieve from 520 * @fa: fileattr pointer 521 * 522 * Call i_op->fileattr_get() callback, if exists. 523 * 524 * Return: 0 on success, or a negative error on failure. 525 */ 526int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 527{ 528 struct inode *inode = d_inode(dentry); 529 530 if (!inode->i_op->fileattr_get) 531 return -ENOIOCTLCMD; 532 533 return inode->i_op->fileattr_get(dentry, fa); 534} 535EXPORT_SYMBOL(vfs_fileattr_get); 536 537/** 538 * copy_fsxattr_to_user - copy fsxattr to userspace. 539 * @fa: fileattr pointer 540 * @ufa: fsxattr user pointer 541 * 542 * Return: 0 on success, or -EFAULT on failure. 543 */ 544int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa) 545{ 546 struct fsxattr xfa; 547 548 memset(&xfa, 0, sizeof(xfa)); 549 xfa.fsx_xflags = fa->fsx_xflags; 550 xfa.fsx_extsize = fa->fsx_extsize; 551 xfa.fsx_nextents = fa->fsx_nextents; 552 xfa.fsx_projid = fa->fsx_projid; 553 xfa.fsx_cowextsize = fa->fsx_cowextsize; 554 555 if (copy_to_user(ufa, &xfa, sizeof(xfa))) 556 return -EFAULT; 557 558 return 0; 559} 560EXPORT_SYMBOL(copy_fsxattr_to_user); 561 562static int copy_fsxattr_from_user(struct fileattr *fa, 563 struct fsxattr __user *ufa) 564{ 565 struct fsxattr xfa; 566 567 if (copy_from_user(&xfa, ufa, sizeof(xfa))) 568 return -EFAULT; 569 570 fileattr_fill_xflags(fa, xfa.fsx_xflags); 571 fa->fsx_extsize = xfa.fsx_extsize; 572 fa->fsx_nextents = xfa.fsx_nextents; 573 fa->fsx_projid = xfa.fsx_projid; 574 fa->fsx_cowextsize = xfa.fsx_cowextsize; 575 576 return 0; 577} 578 579/* 580 * Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject 581 * any invalid configurations. 582 * 583 * Note: must be called with inode lock held. 584 */ 585static int fileattr_set_prepare(struct inode *inode, 586 const struct fileattr *old_ma, 587 struct fileattr *fa) 588{ 589 int err; 590 591 /* 592 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 593 * the relevant capability. 594 */ 595 if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && 596 !capable(CAP_LINUX_IMMUTABLE)) 597 return -EPERM; 598 599 err = fscrypt_prepare_setflags(inode, old_ma->flags, fa->flags); 600 if (err) 601 return err; 602 603 /* 604 * Project Quota ID state is only allowed to change from within the init 605 * namespace. Enforce that restriction only if we are trying to change 606 * the quota ID state. Everything else is allowed in user namespaces. 607 */ 608 if (current_user_ns() != &init_user_ns) { 609 if (old_ma->fsx_projid != fa->fsx_projid) 610 return -EINVAL; 611 if ((old_ma->fsx_xflags ^ fa->fsx_xflags) & 612 FS_XFLAG_PROJINHERIT) 613 return -EINVAL; 614 } else { 615 /* 616 * Caller is allowed to change the project ID. If it is being 617 * changed, make sure that the new value is valid. 618 */ 619 if (old_ma->fsx_projid != fa->fsx_projid && 620 !projid_valid(make_kprojid(&init_user_ns, fa->fsx_projid))) 621 return -EINVAL; 622 } 623 624 /* Check extent size hints. */ 625 if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode)) 626 return -EINVAL; 627 628 if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) && 629 !S_ISDIR(inode->i_mode)) 630 return -EINVAL; 631 632 if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) && 633 !S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) 634 return -EINVAL; 635 636 /* 637 * It is only valid to set the DAX flag on regular files and 638 * directories on filesystems. 639 */ 640 if ((fa->fsx_xflags & FS_XFLAG_DAX) && 641 !(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) 642 return -EINVAL; 643 644 /* Extent size hints of zero turn off the flags. */ 645 if (fa->fsx_extsize == 0) 646 fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT); 647 if (fa->fsx_cowextsize == 0) 648 fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE; 649 650 return 0; 651} 652 653/** 654 * vfs_fileattr_set - change miscellaneous file attributes 655 * @idmap: idmap of the mount 656 * @dentry: the object to change 657 * @fa: fileattr pointer 658 * 659 * After verifying permissions, call i_op->fileattr_set() callback, if 660 * exists. 661 * 662 * Verifying attributes involves retrieving current attributes with 663 * i_op->fileattr_get(), this also allows initializing attributes that have 664 * not been set by the caller to current values. Inode lock is held 665 * thoughout to prevent racing with another instance. 666 * 667 * Return: 0 on success, or a negative error on failure. 668 */ 669int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry, 670 struct fileattr *fa) 671{ 672 struct inode *inode = d_inode(dentry); 673 struct fileattr old_ma = {}; 674 int err; 675 676 if (!inode->i_op->fileattr_set) 677 return -ENOIOCTLCMD; 678 679 if (!inode_owner_or_capable(idmap, inode)) 680 return -EPERM; 681 682 inode_lock(inode); 683 err = vfs_fileattr_get(dentry, &old_ma); 684 if (!err) { 685 /* initialize missing bits from old_ma */ 686 if (fa->flags_valid) { 687 fa->fsx_xflags |= old_ma.fsx_xflags & ~FS_XFLAG_COMMON; 688 fa->fsx_extsize = old_ma.fsx_extsize; 689 fa->fsx_nextents = old_ma.fsx_nextents; 690 fa->fsx_projid = old_ma.fsx_projid; 691 fa->fsx_cowextsize = old_ma.fsx_cowextsize; 692 } else { 693 fa->flags |= old_ma.flags & ~FS_COMMON_FL; 694 } 695 err = fileattr_set_prepare(inode, &old_ma, fa); 696 if (!err) 697 err = inode->i_op->fileattr_set(idmap, dentry, fa); 698 } 699 inode_unlock(inode); 700 701 return err; 702} 703EXPORT_SYMBOL(vfs_fileattr_set); 704 705static int ioctl_getflags(struct file *file, unsigned int __user *argp) 706{ 707 struct fileattr fa = { .flags_valid = true }; /* hint only */ 708 int err; 709 710 err = vfs_fileattr_get(file->f_path.dentry, &fa); 711 if (!err) 712 err = put_user(fa.flags, argp); 713 return err; 714} 715 716static int ioctl_setflags(struct file *file, unsigned int __user *argp) 717{ 718 struct mnt_idmap *idmap = file_mnt_idmap(file); 719 struct dentry *dentry = file->f_path.dentry; 720 struct fileattr fa; 721 unsigned int flags; 722 int err; 723 724 err = get_user(flags, argp); 725 if (!err) { 726 err = mnt_want_write_file(file); 727 if (!err) { 728 fileattr_fill_flags(&fa, flags); 729 err = vfs_fileattr_set(idmap, dentry, &fa); 730 mnt_drop_write_file(file); 731 } 732 } 733 return err; 734} 735 736static int ioctl_fsgetxattr(struct file *file, void __user *argp) 737{ 738 struct fileattr fa = { .fsx_valid = true }; /* hint only */ 739 int err; 740 741 err = vfs_fileattr_get(file->f_path.dentry, &fa); 742 if (!err) 743 err = copy_fsxattr_to_user(&fa, argp); 744 745 return err; 746} 747 748static int ioctl_fssetxattr(struct file *file, void __user *argp) 749{ 750 struct mnt_idmap *idmap = file_mnt_idmap(file); 751 struct dentry *dentry = file->f_path.dentry; 752 struct fileattr fa; 753 int err; 754 755 err = copy_fsxattr_from_user(&fa, argp); 756 if (!err) { 757 err = mnt_want_write_file(file); 758 if (!err) { 759 err = vfs_fileattr_set(idmap, dentry, &fa); 760 mnt_drop_write_file(file); 761 } 762 } 763 return err; 764} 765 766static int ioctl_getfsuuid(struct file *file, void __user *argp) 767{ 768 struct super_block *sb = file_inode(file)->i_sb; 769 struct fsuuid2 u = { .len = sb->s_uuid_len, }; 770 771 if (!sb->s_uuid_len) 772 return -ENOIOCTLCMD; 773 774 memcpy(&u.uuid[0], &sb->s_uuid, sb->s_uuid_len); 775 776 return copy_to_user(argp, &u, sizeof(u)) ? -EFAULT : 0; 777} 778 779static int ioctl_get_fs_sysfs_path(struct file *file, void __user *argp) 780{ 781 struct super_block *sb = file_inode(file)->i_sb; 782 783 if (!strlen(sb->s_sysfs_name)) 784 return -ENOIOCTLCMD; 785 786 struct fs_sysfs_path u = {}; 787 788 u.len = scnprintf(u.name, sizeof(u.name), "%s/%s", sb->s_type->name, sb->s_sysfs_name); 789 790 return copy_to_user(argp, &u, sizeof(u)) ? -EFAULT : 0; 791} 792 793/* 794 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. 795 * It's just a simple helper for sys_ioctl and compat_sys_ioctl. 796 * 797 * When you add any new common ioctls to the switches above and below, 798 * please ensure they have compatible arguments in compat mode. 799 */ 800static int do_vfs_ioctl(struct file *filp, unsigned int fd, 801 unsigned int cmd, unsigned long arg) 802{ 803 void __user *argp = (void __user *)arg; 804 struct inode *inode = file_inode(filp); 805 806 switch (cmd) { 807 case FIOCLEX: 808 set_close_on_exec(fd, 1); 809 return 0; 810 811 case FIONCLEX: 812 set_close_on_exec(fd, 0); 813 return 0; 814 815 case FIONBIO: 816 return ioctl_fionbio(filp, argp); 817 818 case FIOASYNC: 819 return ioctl_fioasync(fd, filp, argp); 820 821 case FIOQSIZE: 822 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) || 823 S_ISLNK(inode->i_mode)) { 824 loff_t res = inode_get_bytes(inode); 825 return copy_to_user(argp, &res, sizeof(res)) ? 826 -EFAULT : 0; 827 } 828 829 return -ENOTTY; 830 831 case FIFREEZE: 832 return ioctl_fsfreeze(filp); 833 834 case FITHAW: 835 return ioctl_fsthaw(filp); 836 837 case FS_IOC_FIEMAP: 838 return ioctl_fiemap(filp, argp); 839 840 case FIGETBSZ: 841 /* anon_bdev filesystems may not have a block size */ 842 if (!inode->i_sb->s_blocksize) 843 return -EINVAL; 844 845 return put_user(inode->i_sb->s_blocksize, (int __user *)argp); 846 847 case FICLONE: 848 return ioctl_file_clone(filp, arg, 0, 0, 0); 849 850 case FICLONERANGE: 851 return ioctl_file_clone_range(filp, argp); 852 853 case FIDEDUPERANGE: 854 return ioctl_file_dedupe_range(filp, argp); 855 856 case FIONREAD: 857 if (!S_ISREG(inode->i_mode)) 858 return vfs_ioctl(filp, cmd, arg); 859 860 return put_user(i_size_read(inode) - filp->f_pos, 861 (int __user *)argp); 862 863 case FS_IOC_GETFLAGS: 864 return ioctl_getflags(filp, argp); 865 866 case FS_IOC_SETFLAGS: 867 return ioctl_setflags(filp, argp); 868 869 case FS_IOC_FSGETXATTR: 870 return ioctl_fsgetxattr(filp, argp); 871 872 case FS_IOC_FSSETXATTR: 873 return ioctl_fssetxattr(filp, argp); 874 875 case FS_IOC_GETFSUUID: 876 return ioctl_getfsuuid(filp, argp); 877 878 case FS_IOC_GETFSSYSFSPATH: 879 return ioctl_get_fs_sysfs_path(filp, argp); 880 881 default: 882 if (S_ISREG(inode->i_mode)) 883 return file_ioctl(filp, cmd, argp); 884 break; 885 } 886 887 return -ENOIOCTLCMD; 888} 889 890SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) 891{ 892 struct fd f = fdget(fd); 893 int error; 894 895 if (!f.file) 896 return -EBADF; 897 898 error = security_file_ioctl(f.file, cmd, arg); 899 if (error) 900 goto out; 901 902 error = do_vfs_ioctl(f.file, fd, cmd, arg); 903 if (error == -ENOIOCTLCMD) 904 error = vfs_ioctl(f.file, cmd, arg); 905 906out: 907 fdput(f); 908 return error; 909} 910 911#ifdef CONFIG_COMPAT 912/** 913 * compat_ptr_ioctl - generic implementation of .compat_ioctl file operation 914 * @file: The file to operate on. 915 * @cmd: The ioctl command number. 916 * @arg: The argument to the ioctl. 917 * 918 * This is not normally called as a function, but instead set in struct 919 * file_operations as 920 * 921 * .compat_ioctl = compat_ptr_ioctl, 922 * 923 * On most architectures, the compat_ptr_ioctl() just passes all arguments 924 * to the corresponding ->ioctl handler. The exception is arch/s390, where 925 * compat_ptr() clears the top bit of a 32-bit pointer value, so user space 926 * pointers to the second 2GB alias the first 2GB, as is the case for 927 * native 32-bit s390 user space. 928 * 929 * The compat_ptr_ioctl() function must therefore be used only with ioctl 930 * functions that either ignore the argument or pass a pointer to a 931 * compatible data type. 932 * 933 * If any ioctl command handled by fops->unlocked_ioctl passes a plain 934 * integer instead of a pointer, or any of the passed data types 935 * is incompatible between 32-bit and 64-bit architectures, a proper 936 * handler is required instead of compat_ptr_ioctl. 937 */ 938long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 939{ 940 if (!file->f_op->unlocked_ioctl) 941 return -ENOIOCTLCMD; 942 943 return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 944} 945EXPORT_SYMBOL(compat_ptr_ioctl); 946 947COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, 948 compat_ulong_t, arg) 949{ 950 struct fd f = fdget(fd); 951 int error; 952 953 if (!f.file) 954 return -EBADF; 955 956 error = security_file_ioctl_compat(f.file, cmd, arg); 957 if (error) 958 goto out; 959 960 switch (cmd) { 961 /* FICLONE takes an int argument, so don't use compat_ptr() */ 962 case FICLONE: 963 error = ioctl_file_clone(f.file, arg, 0, 0, 0); 964 break; 965 966#if defined(CONFIG_X86_64) 967 /* these get messy on amd64 due to alignment differences */ 968 case FS_IOC_RESVSP_32: 969 case FS_IOC_RESVSP64_32: 970 error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg)); 971 break; 972 case FS_IOC_UNRESVSP_32: 973 case FS_IOC_UNRESVSP64_32: 974 error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE, 975 compat_ptr(arg)); 976 break; 977 case FS_IOC_ZERO_RANGE_32: 978 error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE, 979 compat_ptr(arg)); 980 break; 981#endif 982 983 /* 984 * These access 32-bit values anyway so no further handling is 985 * necessary. 986 */ 987 case FS_IOC32_GETFLAGS: 988 case FS_IOC32_SETFLAGS: 989 cmd = (cmd == FS_IOC32_GETFLAGS) ? 990 FS_IOC_GETFLAGS : FS_IOC_SETFLAGS; 991 fallthrough; 992 /* 993 * everything else in do_vfs_ioctl() takes either a compatible 994 * pointer argument or no argument -- call it with a modified 995 * argument. 996 */ 997 default: 998 error = do_vfs_ioctl(f.file, fd, cmd, 999 (unsigned long)compat_ptr(arg)); 1000 if (error != -ENOIOCTLCMD) 1001 break; 1002 1003 if (f.file->f_op->compat_ioctl) 1004 error = f.file->f_op->compat_ioctl(f.file, cmd, arg); 1005 if (error == -ENOIOCTLCMD) 1006 error = -ENOTTY; 1007 break; 1008 } 1009 1010 out: 1011 fdput(f); 1012 1013 return error; 1014} 1015#endif 1016