70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2017 Oracle. All Rights Reserved.
|
||
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
||
|
|
*/
|
||
|
|
#include "xfs.h"
|
||
|
|
#include "xfs_fs.h"
|
||
|
|
#include "xfs_shared.h"
|
||
|
|
#include "xfs_format.h"
|
||
|
|
#include "xfs_trans_resv.h"
|
||
|
|
#include "xfs_mount.h"
|
||
|
|
#include "xfs_log_format.h"
|
||
|
|
#include "xfs_inode.h"
|
||
|
|
#include "xfs_symlink.h"
|
||
|
|
#include "scrub/scrub.h"
|
||
|
|
#include "scrub/common.h"
|
||
|
|
|
||
|
|
/* Set us up to scrub a symbolic link. */
|
||
|
|
int
|
||
|
|
xchk_setup_symlink(
|
||
|
|
struct xfs_scrub *sc)
|
||
|
|
{
|
||
|
|
/* Allocate the buffer without the inode lock held. */
|
||
|
|
sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, XCHK_GFP_FLAGS);
|
||
|
|
if (!sc->buf)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
return xchk_setup_inode_contents(sc, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Symbolic links. */
|
||
|
|
|
||
|
|
int
|
||
|
|
xchk_symlink(
|
||
|
|
struct xfs_scrub *sc)
|
||
|
|
{
|
||
|
|
struct xfs_inode *ip = sc->ip;
|
||
|
|
struct xfs_ifork *ifp;
|
||
|
|
loff_t len;
|
||
|
|
int error = 0;
|
||
|
|
|
||
|
|
if (!S_ISLNK(VFS_I(ip)->i_mode))
|
||
|
|
return -ENOENT;
|
||
|
|
ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
|
||
|
|
len = ip->i_disk_size;
|
||
|
|
|
||
|
|
/* Plausible size? */
|
||
|
|
if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
|
||
|
|
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Inline symlink? */
|
||
|
|
if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
|
||
|
|
if (len > xfs_inode_data_fork_size(ip) ||
|
||
|
|
len > strnlen(ifp->if_u1.if_data, xfs_inode_data_fork_size(ip)))
|
||
|
|
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Remote symlink; must read the contents. */
|
||
|
|
error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
|
||
|
|
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
|
||
|
|
goto out;
|
||
|
|
if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
|
||
|
|
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
|
||
|
|
out:
|
||
|
|
return error;
|
||
|
|
}
|