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_defer.h"
13 #include "xfs_btree.h"
14 #include "xfs_bit.h"
15 #include "xfs_log_format.h"
16 #include "xfs_trans.h"
17 #include "xfs_sb.h"
18 #include "xfs_inode.h"
19 #include "xfs_inode_fork.h"
20 #include "xfs_symlink.h"
21 #include "scrub/xfs_scrub.h"
22 #include "scrub/scrub.h"
23 #include "scrub/common.h"
24 #include "scrub/trace.h"
25
26 /* Set us up to scrub a symbolic link. */
27 int
xchk_setup_symlink(struct xfs_scrub * sc,struct xfs_inode * ip)28 xchk_setup_symlink(
29 struct xfs_scrub *sc,
30 struct xfs_inode *ip)
31 {
32 /* Allocate the buffer without the inode lock held. */
33 sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, KM_SLEEP);
34 if (!sc->buf)
35 return -ENOMEM;
36
37 return xchk_setup_inode_contents(sc, ip, 0);
38 }
39
40 /* Symbolic links. */
41
42 int
xchk_symlink(struct xfs_scrub * sc)43 xchk_symlink(
44 struct xfs_scrub *sc)
45 {
46 struct xfs_inode *ip = sc->ip;
47 struct xfs_ifork *ifp;
48 loff_t len;
49 int error = 0;
50
51 if (!S_ISLNK(VFS_I(ip)->i_mode))
52 return -ENOENT;
53 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
54 len = ip->i_d.di_size;
55
56 /* Plausible size? */
57 if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
58 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
59 goto out;
60 }
61
62 /* Inline symlink? */
63 if (ifp->if_flags & XFS_IFINLINE) {
64 if (len > XFS_IFORK_DSIZE(ip) ||
65 len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip)))
66 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
67 goto out;
68 }
69
70 /* Remote symlink; must read the contents. */
71 error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
72 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
73 goto out;
74 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
75 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
76 out:
77 return error;
78 }
79