cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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symlink.c (1631B)

      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. */
     19int
     20xchk_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
     33int
     34xchk_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);
     67out:
     68	return error;
     69}