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 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 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