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