261 lines
7.2 KiB
C
261 lines
7.2 KiB
C
/*
|
|
* Copyright (C) 2017 Oracle. All Rights Reserved.
|
|
*
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
#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_defer.h"
|
|
#include "xfs_btree.h"
|
|
#include "xfs_bit.h"
|
|
#include "xfs_log_format.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_da_format.h"
|
|
#include "xfs_da_btree.h"
|
|
#include "xfs_dir2.h"
|
|
#include "xfs_attr.h"
|
|
#include "xfs_attr_leaf.h"
|
|
#include "scrub/xfs_scrub.h"
|
|
#include "scrub/scrub.h"
|
|
#include "scrub/common.h"
|
|
#include "scrub/dabtree.h"
|
|
#include "scrub/trace.h"
|
|
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/xattr.h>
|
|
|
|
/* Set us up to scrub an inode's extended attributes. */
|
|
int
|
|
xfs_scrub_setup_xattr(
|
|
struct xfs_scrub_context *sc,
|
|
struct xfs_inode *ip)
|
|
{
|
|
/* Allocate the buffer without the inode lock held. */
|
|
sc->buf = kmem_zalloc_large(XATTR_SIZE_MAX, KM_SLEEP);
|
|
if (!sc->buf)
|
|
return -ENOMEM;
|
|
|
|
return xfs_scrub_setup_inode_contents(sc, ip, 0);
|
|
}
|
|
|
|
/* Extended Attributes */
|
|
|
|
struct xfs_scrub_xattr {
|
|
struct xfs_attr_list_context context;
|
|
struct xfs_scrub_context *sc;
|
|
};
|
|
|
|
/*
|
|
* Check that an extended attribute key can be looked up by hash.
|
|
*
|
|
* We use the XFS attribute list iterator (i.e. xfs_attr_list_int_ilocked)
|
|
* to call this function for every attribute key in an inode. Once
|
|
* we're here, we load the attribute value to see if any errors happen,
|
|
* or if we get more or less data than we expected.
|
|
*/
|
|
static void
|
|
xfs_scrub_xattr_listent(
|
|
struct xfs_attr_list_context *context,
|
|
int flags,
|
|
unsigned char *name,
|
|
int namelen,
|
|
int valuelen)
|
|
{
|
|
struct xfs_scrub_xattr *sx;
|
|
struct xfs_da_args args = {0};
|
|
int error = 0;
|
|
|
|
sx = container_of(context, struct xfs_scrub_xattr, context);
|
|
|
|
if (flags & XFS_ATTR_INCOMPLETE) {
|
|
/* Incomplete attr key, just mark the inode for preening. */
|
|
xfs_scrub_ino_set_preen(sx->sc, NULL);
|
|
return;
|
|
}
|
|
|
|
args.flags = ATTR_KERNOTIME;
|
|
if (flags & XFS_ATTR_ROOT)
|
|
args.flags |= ATTR_ROOT;
|
|
else if (flags & XFS_ATTR_SECURE)
|
|
args.flags |= ATTR_SECURE;
|
|
args.geo = context->dp->i_mount->m_attr_geo;
|
|
args.whichfork = XFS_ATTR_FORK;
|
|
args.dp = context->dp;
|
|
args.name = name;
|
|
args.namelen = namelen;
|
|
args.hashval = xfs_da_hashname(args.name, args.namelen);
|
|
args.trans = context->tp;
|
|
args.value = sx->sc->buf;
|
|
args.valuelen = XATTR_SIZE_MAX;
|
|
|
|
error = xfs_attr_get_ilocked(context->dp, &args);
|
|
if (error == -EEXIST)
|
|
error = 0;
|
|
if (!xfs_scrub_fblock_process_error(sx->sc, XFS_ATTR_FORK, args.blkno,
|
|
&error))
|
|
goto fail_xref;
|
|
if (args.valuelen != valuelen)
|
|
xfs_scrub_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK,
|
|
args.blkno);
|
|
|
|
fail_xref:
|
|
return;
|
|
}
|
|
|
|
/* Scrub a attribute btree record. */
|
|
STATIC int
|
|
xfs_scrub_xattr_rec(
|
|
struct xfs_scrub_da_btree *ds,
|
|
int level,
|
|
void *rec)
|
|
{
|
|
struct xfs_mount *mp = ds->state->mp;
|
|
struct xfs_attr_leaf_entry *ent = rec;
|
|
struct xfs_da_state_blk *blk;
|
|
struct xfs_attr_leaf_name_local *lentry;
|
|
struct xfs_attr_leaf_name_remote *rentry;
|
|
struct xfs_buf *bp;
|
|
xfs_dahash_t calc_hash;
|
|
xfs_dahash_t hash;
|
|
int nameidx;
|
|
int hdrsize;
|
|
unsigned int badflags;
|
|
int error;
|
|
|
|
blk = &ds->state->path.blk[level];
|
|
|
|
/* Check the hash of the entry. */
|
|
error = xfs_scrub_da_btree_hash(ds, level, &ent->hashval);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* Find the attr entry's location. */
|
|
bp = blk->bp;
|
|
hdrsize = xfs_attr3_leaf_hdr_size(bp->b_addr);
|
|
nameidx = be16_to_cpu(ent->nameidx);
|
|
if (nameidx < hdrsize || nameidx >= mp->m_attr_geo->blksize) {
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
|
|
/* Check all the padding. */
|
|
if (xfs_sb_version_hascrc(&ds->sc->mp->m_sb)) {
|
|
struct xfs_attr3_leafblock *leaf = bp->b_addr;
|
|
|
|
if (leaf->hdr.pad1 != 0 ||
|
|
leaf->hdr.pad2 != cpu_to_be32(0) ||
|
|
leaf->hdr.info.hdr.pad != cpu_to_be16(0))
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
} else {
|
|
struct xfs_attr_leafblock *leaf = bp->b_addr;
|
|
|
|
if (leaf->hdr.pad1 != 0 ||
|
|
leaf->hdr.info.pad != cpu_to_be16(0))
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
}
|
|
if (ent->pad2 != 0)
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
|
|
/* Retrieve the entry and check it. */
|
|
hash = be32_to_cpu(ent->hashval);
|
|
badflags = ~(XFS_ATTR_LOCAL | XFS_ATTR_ROOT | XFS_ATTR_SECURE |
|
|
XFS_ATTR_INCOMPLETE);
|
|
if ((ent->flags & badflags) != 0)
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
if (ent->flags & XFS_ATTR_LOCAL) {
|
|
lentry = (struct xfs_attr_leaf_name_local *)
|
|
(((char *)bp->b_addr) + nameidx);
|
|
if (lentry->namelen <= 0) {
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
calc_hash = xfs_da_hashname(lentry->nameval, lentry->namelen);
|
|
} else {
|
|
rentry = (struct xfs_attr_leaf_name_remote *)
|
|
(((char *)bp->b_addr) + nameidx);
|
|
if (rentry->namelen <= 0) {
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
goto out;
|
|
}
|
|
calc_hash = xfs_da_hashname(rentry->name, rentry->namelen);
|
|
}
|
|
if (calc_hash != hash)
|
|
xfs_scrub_da_set_corrupt(ds, level);
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/* Scrub the extended attribute metadata. */
|
|
int
|
|
xfs_scrub_xattr(
|
|
struct xfs_scrub_context *sc)
|
|
{
|
|
struct xfs_scrub_xattr sx = { 0 };
|
|
struct attrlist_cursor_kern cursor = { 0 };
|
|
int error = 0;
|
|
|
|
if (!xfs_inode_hasattr(sc->ip))
|
|
return -ENOENT;
|
|
|
|
memset(&sx, 0, sizeof(sx));
|
|
/* Check attribute tree structure */
|
|
error = xfs_scrub_da_btree(sc, XFS_ATTR_FORK, xfs_scrub_xattr_rec);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
/* Check that every attr key can also be looked up by hash. */
|
|
sx.context.dp = sc->ip;
|
|
sx.context.cursor = &cursor;
|
|
sx.context.resynch = 1;
|
|
sx.context.put_listent = xfs_scrub_xattr_listent;
|
|
sx.context.tp = sc->tp;
|
|
sx.context.flags = ATTR_INCOMPLETE;
|
|
sx.sc = sc;
|
|
|
|
/*
|
|
* Look up every xattr in this file by name.
|
|
*
|
|
* Use the backend implementation of xfs_attr_list to call
|
|
* xfs_scrub_xattr_listent on every attribute key in this inode.
|
|
* In other words, we use the same iterator/callback mechanism
|
|
* that listattr uses to scrub extended attributes, though in our
|
|
* _listent function, we check the value of the attribute.
|
|
*
|
|
* The VFS only locks i_rwsem when modifying attrs, so keep all
|
|
* three locks held because that's the only way to ensure we're
|
|
* the only thread poking into the da btree. We traverse the da
|
|
* btree while holding a leaf buffer locked for the xattr name
|
|
* iteration, which doesn't really follow the usual buffer
|
|
* locking order.
|
|
*/
|
|
error = xfs_attr_list_int_ilocked(&sx.context);
|
|
if (!xfs_scrub_fblock_process_error(sc, XFS_ATTR_FORK, 0, &error))
|
|
goto out;
|
|
out:
|
|
return error;
|
|
}
|