1 /* 2 * Copyright (C) 2017 Oracle. All Rights Reserved. 3 * 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it would be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 19 */ 20 #include "xfs.h" 21 #include "xfs_fs.h" 22 #include "xfs_shared.h" 23 #include "xfs_format.h" 24 #include "xfs_trans_resv.h" 25 #include "xfs_mount.h" 26 #include "xfs_defer.h" 27 #include "xfs_btree.h" 28 #include "xfs_bit.h" 29 #include "xfs_log_format.h" 30 #include "xfs_trans.h" 31 #include "xfs_sb.h" 32 #include "xfs_inode.h" 33 #include "xfs_inode_fork.h" 34 #include "xfs_symlink.h" 35 #include "scrub/xfs_scrub.h" 36 #include "scrub/scrub.h" 37 #include "scrub/common.h" 38 #include "scrub/trace.h" 39 40 /* Set us up to scrub a symbolic link. */ 41 int 42 xfs_scrub_setup_symlink( 43 struct xfs_scrub_context *sc, 44 struct xfs_inode *ip) 45 { 46 /* Allocate the buffer without the inode lock held. */ 47 sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, KM_SLEEP); 48 if (!sc->buf) 49 return -ENOMEM; 50 51 return xfs_scrub_setup_inode_contents(sc, ip, 0); 52 } 53 54 /* Symbolic links. */ 55 56 int 57 xfs_scrub_symlink( 58 struct xfs_scrub_context *sc) 59 { 60 struct xfs_inode *ip = sc->ip; 61 struct xfs_ifork *ifp; 62 loff_t len; 63 int error = 0; 64 65 if (!S_ISLNK(VFS_I(ip)->i_mode)) 66 return -ENOENT; 67 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); 68 len = ip->i_d.di_size; 69 70 /* Plausible size? */ 71 if (len > XFS_SYMLINK_MAXLEN || len <= 0) { 72 xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0); 73 goto out; 74 } 75 76 /* Inline symlink? */ 77 if (ifp->if_flags & XFS_IFINLINE) { 78 if (len > XFS_IFORK_DSIZE(ip) || 79 len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip))) 80 xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0); 81 goto out; 82 } 83 84 /* Remote symlink; must read the contents. */ 85 error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf); 86 if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error)) 87 goto out; 88 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len) 89 xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0); 90 out: 91 return error; 92 } 93