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 */
vfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)41 long 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 }
54 EXPORT_SYMBOL(vfs_ioctl);
55
ioctl_fibmap(struct file * filp,int __user * p)56 static 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)
fiemap_fill_next_extent(struct fiemap_extent_info * fieinfo,u64 logical,u64 phys,u64 len,u32 flags)112 int 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 }
149 EXPORT_SYMBOL_NS(fiemap_fill_next_extent, ANDROID_GKI_VFS_EXPORT_ONLY);
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 */
fiemap_prep(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 * len,u32 supported_flags)164 int 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 }
194 EXPORT_SYMBOL_NS(fiemap_prep, ANDROID_GKI_VFS_EXPORT_ONLY);
195
ioctl_fiemap(struct file * filp,struct fiemap __user * ufiemap)196 static 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
ioctl_file_clone(struct file * dst_file,unsigned long srcfd,u64 off,u64 olen,u64 destoff)227 static 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;
247 fdput:
248 fdput(src_file);
249 return ret;
250 }
251
ioctl_file_clone_range(struct file * file,struct file_clone_range __user * argp)252 static 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
logical_to_blk(struct inode * inode,loff_t offset)265 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
266 {
267 return (offset >> inode->i_blkbits);
268 }
269
blk_to_logical(struct inode * inode,sector_t blk)270 static 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 */
__generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,loff_t start,loff_t len,get_block_t * get_block)294 static 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
generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len,get_block_t * get_block)452 int 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 }
462 EXPORT_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 */
ioctl_preallocate(struct file * filp,int mode,void __user * argp)473 static 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 */
compat_ioctl_preallocate(struct file * file,int mode,struct space_resv_32 __user * argp)501 static 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
file_ioctl(struct file * filp,unsigned int cmd,int __user * p)527 static 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
ioctl_fionbio(struct file * filp,int __user * argp)545 static 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
ioctl_fioasync(unsigned int fd,struct file * filp,int __user * argp)568 static 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
ioctl_fsfreeze(struct file * filp)590 static 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
ioctl_fsthaw(struct file * filp)607 static 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
ioctl_file_dedupe_range(struct file * file,struct file_dedupe_range __user * argp)620 static 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
655 out:
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 */
do_vfs_ioctl(struct file * filp,unsigned int fd,unsigned int cmd,unsigned long arg)667 static 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
SYSCALL_DEFINE3(ioctl,unsigned int,fd,unsigned int,cmd,unsigned long,arg)739 SYSCALL_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
755 out:
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 */
compat_ptr_ioctl(struct file * file,unsigned int cmd,unsigned long arg)784 long 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 }
791 EXPORT_SYMBOL(compat_ptr_ioctl);
792
COMPAT_SYSCALL_DEFINE3(ioctl,unsigned int,fd,unsigned int,cmd,compat_ulong_t,arg)793 COMPAT_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 error = security_file_ioctl_compat(f.file, cmd, arg);
803 if (error)
804 goto out;
805
806 switch (cmd) {
807 /* FICLONE takes an int argument, so don't use compat_ptr() */
808 case FICLONE:
809 error = ioctl_file_clone(f.file, arg, 0, 0, 0);
810 break;
811
812 #if defined(CONFIG_X86_64)
813 /* these get messy on amd64 due to alignment differences */
814 case FS_IOC_RESVSP_32:
815 case FS_IOC_RESVSP64_32:
816 error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
817 break;
818 case FS_IOC_UNRESVSP_32:
819 case FS_IOC_UNRESVSP64_32:
820 error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
821 compat_ptr(arg));
822 break;
823 case FS_IOC_ZERO_RANGE_32:
824 error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
825 compat_ptr(arg));
826 break;
827 #endif
828
829 /*
830 * everything else in do_vfs_ioctl() takes either a compatible
831 * pointer argument or no argument -- call it with a modified
832 * argument.
833 */
834 default:
835 error = do_vfs_ioctl(f.file, fd, cmd,
836 (unsigned long)compat_ptr(arg));
837 if (error != -ENOIOCTLCMD)
838 break;
839
840 if (f.file->f_op->compat_ioctl)
841 error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
842 if (error == -ENOIOCTLCMD)
843 error = -ENOTTY;
844 break;
845 }
846
847 out:
848 fdput(f);
849
850 return error;
851 }
852 #endif
853