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hc
2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/fs/ioctl.c
....@@ -8,6 +8,7 @@
88 #include <linux/syscalls.h>
99 #include <linux/mm.h>
1010 #include <linux/capability.h>
11
+#include <linux/compat.h>
1112 #include <linux/file.h>
1213 #include <linux/fs.h>
1314 #include <linux/security.h>
....@@ -17,6 +18,7 @@
1718 #include <linux/buffer_head.h>
1819 #include <linux/falloc.h>
1920 #include <linux/sched/signal.h>
21
+#include <linux/fiemap.h>
2022 
2123 #include "internal.h"
2224 
....@@ -53,19 +55,40 @@
5355 
5456 static int ioctl_fibmap(struct file *filp, int __user *p)
5557 {
56
-	struct address_space *mapping = filp->f_mapping;
57
-	int res, block;
58
+	struct inode *inode = file_inode(filp);
59
+	struct super_block *sb = inode->i_sb;
60
+	int error, ur_block;
61
+	sector_t block;
5862 
59
-	/* do we support this mess? */
60
-	if (!mapping->a_ops->bmap)
61
-		return -EINVAL;
6263 	if (!capable(CAP_SYS_RAWIO))
6364 		return -EPERM;
64
-	res = get_user(block, p);
65
-	if (res)
66
-		return res;
67
-	res = mapping->a_ops->bmap(mapping, block);
68
-	return put_user(res, p);
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;
6992 }
7093 
7194 /**
....@@ -123,65 +146,58 @@
123146 		return 1;
124147 	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
125148 }
126
-EXPORT_SYMBOL(fiemap_fill_next_extent);
149
+EXPORT_SYMBOL_NS(fiemap_fill_next_extent, ANDROID_GKI_VFS_EXPORT_ONLY);
127150 
128151 /**
129
- * fiemap_check_flags - check validity of requested flags for fiemap
152
+ * fiemap_prep - check validity of requested flags for fiemap
153
+ * @inode:	Inode to operate on
130154  * @fieinfo:	Fiemap context passed into ->fiemap
131
- * @fs_flags:	Set of fiemap flags that the file system understands
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
132158  *
133
- * Called from file system ->fiemap callback. This will compute the
134
- * intersection of valid fiemap flags and those that the fs supports. That
135
- * value is then compared against the user supplied flags. In case of bad user
136
- * flags, the invalid values will be written into the fieinfo structure, and
137
- * -EBADR is returned, which tells ioctl_fiemap() to return those values to
138
- * userspace. For this reason, a return code of -EBADR should be preserved.
159
+ * This function must be called from each ->fiemap instance to validate the
160
+ * fiemap request against the file system parameters.
139161  *
140
- * Returns 0 on success, -EBADR on bad flags.
162
+ * Returns 0 on success, or a negative error on failure.
141163  */
142
-int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
164
+int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
165
+		u64 start, u64 *len, u32 supported_flags)
143166 {
167
+	u64 maxbytes = inode->i_sb->s_maxbytes;
144168 	u32 incompat_flags;
169
+	int ret = 0;
145170 
146
-	incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
147
-	if (incompat_flags) {
148
-		fieinfo->fi_flags = incompat_flags;
149
-		return -EBADR;
150
-	}
151
-	return 0;
152
-}
153
-EXPORT_SYMBOL(fiemap_check_flags);
154
-
155
-static int fiemap_check_ranges(struct super_block *sb,
156
-			       u64 start, u64 len, u64 *new_len)
157
-{
158
-	u64 maxbytes = (u64) sb->s_maxbytes;
159
-
160
-	*new_len = len;
161
-
162
-	if (len == 0)
171
+	if (*len == 0)
163172 		return -EINVAL;
164
-
165
-	if (start > maxbytes)
173
+	if (start >= maxbytes)
166174 		return -EFBIG;
167175 
168176 	/*
169177 	 * Shrink request scope to what the fs can actually handle.
170178 	 */
171
-	if (len > maxbytes || (maxbytes - len) < start)
172
-		*new_len = maxbytes - start;
179
+	if (*len > maxbytes || (maxbytes - *len) < start)
180
+		*len = maxbytes - start;
173181 
174
-	return 0;
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;
175193 }
194
+EXPORT_SYMBOL_NS(fiemap_prep, ANDROID_GKI_VFS_EXPORT_ONLY);
176195 
177
-static int ioctl_fiemap(struct file *filp, unsigned long arg)
196
+static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
178197 {
179198 	struct fiemap fiemap;
180
-	struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
181199 	struct fiemap_extent_info fieinfo = { 0, };
182200 	struct inode *inode = file_inode(filp);
183
-	struct super_block *sb = inode->i_sb;
184
-	u64 len;
185201 	int error;
186202 
187203 	if (!inode->i_op->fiemap)
....@@ -193,24 +209,13 @@
193209 	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
194210 		return -EINVAL;
195211 
196
-	error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
197
-				    &len);
198
-	if (error)
199
-		return error;
200
-
201212 	fieinfo.fi_flags = fiemap.fm_flags;
202213 	fieinfo.fi_extents_max = fiemap.fm_extent_count;
203214 	fieinfo.fi_extents_start = ufiemap->fm_extents;
204215 
205
-	if (fiemap.fm_extent_count != 0 &&
206
-	    !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
207
-		       fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
208
-		return -EFAULT;
216
+	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
217
+			fiemap.fm_length);
209218 
210
-	if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
211
-		filemap_write_and_wait(inode->i_mapping);
212
-
213
-	error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
214219 	fiemap.fm_flags = fieinfo.fi_flags;
215220 	fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
216221 	if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
....@@ -223,6 +228,7 @@
223228 			     u64 off, u64 olen, u64 destoff)
224229 {
225230 	struct fd src_file = fdget(srcfd);
231
+	loff_t cloned;
226232 	int ret;
227233 
228234 	if (!src_file.file)
....@@ -230,13 +236,21 @@
230236 	ret = -EXDEV;
231237 	if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
232238 		goto fdput;
233
-	ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
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;
234247 fdput:
235248 	fdput(src_file);
236249 	return ret;
237250 }
238251 
239
-static long ioctl_file_clone_range(struct file *file, void __user *argp)
252
+static long ioctl_file_clone_range(struct file *file,
253
+				   struct file_clone_range __user *argp)
240254 {
241255 	struct file_clone_range args;
242256 
....@@ -277,8 +291,7 @@
277291  * If you use this function directly, you need to do your own locking. Use
278292  * generic_block_fiemap if you want the locking done for you.
279293  */
280
-
281
-int __generic_block_fiemap(struct inode *inode,
294
+static int __generic_block_fiemap(struct inode *inode,
282295 			   struct fiemap_extent_info *fieinfo, loff_t start,
283296 			   loff_t len, get_block_t *get_block)
284297 {
....@@ -290,7 +303,7 @@
290303 	bool past_eof = false, whole_file = false;
291304 	int ret = 0;
292305 
293
-	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
306
+	ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
294307 	if (ret)
295308 		return ret;
296309 
....@@ -423,7 +436,6 @@
423436 
424437 	return ret;
425438 }
426
-EXPORT_SYMBOL(__generic_block_fiemap);
427439 
428440 /**
429441  * generic_block_fiemap - FIEMAP for block based inodes
....@@ -458,7 +470,7 @@
458470  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
459471  * are used here, rest are ignored.
460472  */
461
-int ioctl_preallocate(struct file *filp, void __user *argp)
473
+static int ioctl_preallocate(struct file *filp, int mode, void __user *argp)
462474 {
463475 	struct inode *inode = file_inode(filp);
464476 	struct space_resv sr;
....@@ -479,26 +491,55 @@
479491 		return -EINVAL;
480492 	}
481493 
482
-	return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
494
+	return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start,
495
+			sr.l_len);
483496 }
484497 
485
-static int file_ioctl(struct file *filp, unsigned int cmd,
486
-		unsigned long arg)
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 */
501
+static int compat_ioctl_preallocate(struct file *file, int mode,
502
+				    struct space_resv_32 __user *argp)
487503 {
488
-	struct inode *inode = file_inode(filp);
489
-	int __user *p = (int __user *)arg;
504
+	struct inode *inode = file_inode(file);
505
+	struct space_resv_32 sr;
490506 
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
+
527
+static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p)
528
+{
491529 	switch (cmd) {
492530 	case FIBMAP:
493531 		return ioctl_fibmap(filp, p);
494
-	case FIONREAD:
495
-		return put_user(i_size_read(inode) - filp->f_pos, p);
496532 	case FS_IOC_RESVSP:
497533 	case FS_IOC_RESVSP64:
498
-		return ioctl_preallocate(filp, p);
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);
499540 	}
500541 
501
-	return vfs_ioctl(filp, cmd, arg);
542
+	return -ENOIOCTLCMD;
502543 }
503544 
504545 static int ioctl_fionbio(struct file *filp, int __user *argp)
....@@ -576,9 +617,9 @@
576617 	return thaw_super(sb);
577618 }
578619 
579
-static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
620
+static int ioctl_file_dedupe_range(struct file *file,
621
+				   struct file_dedupe_range __user *argp)
580622 {
581
-	struct file_dedupe_range __user *argp = arg;
582623 	struct file_dedupe_range *same = NULL;
583624 	int ret;
584625 	unsigned long size;
....@@ -617,62 +658,58 @@
617658 }
618659 
619660 /*
620
- * When you add any new common ioctls to the switches above and below
621
- * please update compat_sys_ioctl() too.
622
- *
623661  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
624662  * 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.
625666  */
626
-int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
627
-	     unsigned long arg)
667
+static int do_vfs_ioctl(struct file *filp, unsigned int fd,
668
+			unsigned int cmd, unsigned long arg)
628669 {
629
-	int error = 0;
630
-	int __user *argp = (int __user *)arg;
670
+	void __user *argp = (void __user *)arg;
631671 	struct inode *inode = file_inode(filp);
632672 
633673 	switch (cmd) {
634674 	case FIOCLEX:
635675 		set_close_on_exec(fd, 1);
636
-		break;
676
+		return 0;
637677 
638678 	case FIONCLEX:
639679 		set_close_on_exec(fd, 0);
640
-		break;
680
+		return 0;
641681 
642682 	case FIONBIO:
643
-		error = ioctl_fionbio(filp, argp);
644
-		break;
683
+		return ioctl_fionbio(filp, argp);
645684 
646685 	case FIOASYNC:
647
-		error = ioctl_fioasync(fd, filp, argp);
648
-		break;
686
+		return ioctl_fioasync(fd, filp, argp);
649687 
650688 	case FIOQSIZE:
651689 		if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
652690 		    S_ISLNK(inode->i_mode)) {
653691 			loff_t res = inode_get_bytes(inode);
654
-			error = copy_to_user(argp, &res, sizeof(res)) ?
655
-					-EFAULT : 0;
656
-		} else
657
-			error = -ENOTTY;
658
-		break;
692
+			return copy_to_user(argp, &res, sizeof(res)) ?
693
+					    -EFAULT : 0;
694
+		}
695
+
696
+		return -ENOTTY;
659697 
660698 	case FIFREEZE:
661
-		error = ioctl_fsfreeze(filp);
662
-		break;
699
+		return ioctl_fsfreeze(filp);
663700 
664701 	case FITHAW:
665
-		error = ioctl_fsthaw(filp);
666
-		break;
702
+		return ioctl_fsthaw(filp);
667703 
668704 	case FS_IOC_FIEMAP:
669
-		return ioctl_fiemap(filp, arg);
705
+		return ioctl_fiemap(filp, argp);
670706 
671707 	case FIGETBSZ:
672708 		/* anon_bdev filesystems may not have a block size */
673709 		if (!inode->i_sb->s_blocksize)
674710 			return -EINVAL;
675
-		return put_user(inode->i_sb->s_blocksize, argp);
711
+
712
+		return put_user(inode->i_sb->s_blocksize, (int __user *)argp);
676713 
677714 	case FICLONE:
678715 		return ioctl_file_clone(filp, arg, 0, 0, 0);
....@@ -683,31 +720,134 @@
683720 	case FIDEDUPERANGE:
684721 		return ioctl_file_dedupe_range(filp, argp);
685722 
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
+
686730 	default:
687731 		if (S_ISREG(inode->i_mode))
688
-			error = file_ioctl(filp, cmd, arg);
689
-		else
690
-			error = vfs_ioctl(filp, cmd, arg);
732
+			return file_ioctl(filp, cmd, argp);
691733 		break;
692734 	}
693
-	return error;
694
-}
695735 
696
-int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
697
-{
698
-	int error;
699
-	struct fd f = fdget(fd);
700
-
701
-	if (!f.file)
702
-		return -EBADF;
703
-	error = security_file_ioctl(f.file, cmd, arg);
704
-	if (!error)
705
-		error = do_vfs_ioctl(f.file, fd, cmd, arg);
706
-	fdput(f);
707
-	return error;
736
+	return -ENOIOCTLCMD;
708737 }
709738 
710739 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
711740 {
712
-	return ksys_ioctl(fd, cmd, arg);
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;
713758 }
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
+ */
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
+
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
+	/* 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