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 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 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