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// 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, struct xfs_inode *ip) { /* Allocate the buffer without the inode lock held. */ sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, 0); if (!sc->buf) return -ENOMEM; return xchk_setup_inode_contents(sc, ip, 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_d.di_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_flags & XFS_IFINLINE) { if (len > XFS_IFORK_DSIZE(ip) || len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(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; }