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