| // 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, GFP_KERNEL); |
| 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; |
| } |