1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_trans_resv.h"
11 #include "xfs_mount.h"
12 #include "xfs_log_format.h"
13 #include "xfs_inode.h"
14 #include "xfs_symlink.h"
15 #include "scrub/scrub.h"
16 #include "scrub/common.h"
17
18 /* Set us up to scrub a symbolic link. */
19 int
xchk_setup_symlink(struct xfs_scrub * sc)20 xchk_setup_symlink(
21 struct xfs_scrub *sc)
22 {
23 /* Allocate the buffer without the inode lock held. */
24 sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, GFP_KERNEL);
25 if (!sc->buf)
26 return -ENOMEM;
27
28 return xchk_setup_inode_contents(sc, 0);
29 }
30
31 /* Symbolic links. */
32
33 int
xchk_symlink(struct xfs_scrub * sc)34 xchk_symlink(
35 struct xfs_scrub *sc)
36 {
37 struct xfs_inode *ip = sc->ip;
38 struct xfs_ifork *ifp;
39 loff_t len;
40 int error = 0;
41
42 if (!S_ISLNK(VFS_I(ip)->i_mode))
43 return -ENOENT;
44 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
45 len = ip->i_disk_size;
46
47 /* Plausible size? */
48 if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
49 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
50 goto out;
51 }
52
53 /* Inline symlink? */
54 if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
55 if (len > XFS_IFORK_DSIZE(ip) ||
56 len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip)))
57 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
58 goto out;
59 }
60
61 /* Remote symlink; must read the contents. */
62 error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
63 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
64 goto out;
65 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
66 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
67 out:
68 return error;
69 }
70
