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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_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/dabtree.h"
/* Set us up to scrub an inode's extended attributes. */
int
xchk_setup_xattr(
struct xfs_scrub *sc,
struct xfs_inode *ip)
{
size_t sz;
/*
* Allocate the buffer without the inode lock held. We need enough
* space to read every xattr value in the file or enough space to
* hold three copies of the xattr free space bitmap. (Not both at
* the same time.)
*/
sz = max_t(size_t, XATTR_SIZE_MAX, 3 * sizeof(long) *
BITS_TO_LONGS(sc->mp->m_attr_geo->blksize));
sc->buf = kmem_zalloc_large(sz, KM_SLEEP);
if (!sc->buf)
return -ENOMEM;
return xchk_setup_inode_contents(sc, ip, 0);
}
/* Extended Attributes */
struct xchk_xattr {
struct xfs_attr_list_context context;
struct xfs_scrub *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
xchk_xattr_listent(
struct xfs_attr_list_context *context,
int flags,
unsigned char *name,
int namelen,
int valuelen)
{
struct xchk_xattr *sx;
struct xfs_da_args args = { NULL };
int error = 0;
sx = container_of(context, struct xchk_xattr, context);
if (xchk_should_terminate(sx->sc, &error)) {
context->seen_enough = 1;
return;
}
if (flags & XFS_ATTR_INCOMPLETE) {
/* Incomplete attr key, just mark the inode for preening. */
xchk_ino_set_preen(sx->sc, context->dp->i_ino);
return;
}
/* Does this name make sense? */
if (!xfs_attr_namecheck(name, namelen)) {
xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno);
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 (!xchk_fblock_process_error(sx->sc, XFS_ATTR_FORK, args.blkno,
&error))
goto fail_xref;
if (args.valuelen != valuelen)
xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK,
args.blkno);
fail_xref:
if (sx->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
context->seen_enough = 1;
return;
}
/*
* Mark a range [start, start+len) in this map. Returns true if the
* region was free, and false if there's a conflict or a problem.
*
* Within a char, the lowest bit of the char represents the byte with
* the smallest address
*/
STATIC bool
xchk_xattr_set_map(
struct xfs_scrub *sc,
unsigned long *map,
unsigned int start,
unsigned int len)
{
unsigned int mapsize = sc->mp->m_attr_geo->blksize;
bool ret = true;
if (start >= mapsize)
return false;
if (start + len > mapsize) {
len = mapsize - start;
ret = false;
}
if (find_next_bit(map, mapsize, start) < start + len)
ret = false;
bitmap_set(map, start, len);
return ret;
}
/*
* Check the leaf freemap from the usage bitmap. Returns false if the
* attr freemap has problems or points to used space.
*/
STATIC bool
xchk_xattr_check_freemap(
struct xfs_scrub *sc,
unsigned long *map,
struct xfs_attr3_icleaf_hdr *leafhdr)
{
unsigned long *freemap;
unsigned long *dstmap;
unsigned int mapsize = sc->mp->m_attr_geo->blksize;
int i;
/* Construct bitmap of freemap contents. */
freemap = (unsigned long *)sc->buf + BITS_TO_LONGS(mapsize);
bitmap_zero(freemap, mapsize);
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
if (!xchk_xattr_set_map(sc, freemap,
leafhdr->freemap[i].base,
leafhdr->freemap[i].size))
return false;
}
/* Look for bits that are set in freemap and are marked in use. */
dstmap = freemap + BITS_TO_LONGS(mapsize);
return bitmap_and(dstmap, freemap, map, mapsize) == 0;
}
/*
* Check this leaf entry's relations to everything else.
* Returns the number of bytes used for the name/value data.
*/
STATIC void
xchk_xattr_entry(
struct xchk_da_btree *ds,
int level,
char *buf_end,
struct xfs_attr_leafblock *leaf,
struct xfs_attr3_icleaf_hdr *leafhdr,
unsigned long *usedmap,
struct xfs_attr_leaf_entry *ent,
int idx,
unsigned int *usedbytes,
__u32 *last_hashval)
{
struct xfs_mount *mp = ds->state->mp;
char *name_end;
struct xfs_attr_leaf_name_local *lentry;
struct xfs_attr_leaf_name_remote *rentry;
unsigned int nameidx;
unsigned int namesize;
if (ent->pad2 != 0)
xchk_da_set_corrupt(ds, level);
/* Hash values in order? */
if (be32_to_cpu(ent->hashval) < *last_hashval)
xchk_da_set_corrupt(ds, level);
*last_hashval = be32_to_cpu(ent->hashval);
nameidx = be16_to_cpu(ent->nameidx);
if (nameidx < leafhdr->firstused ||
nameidx >= mp->m_attr_geo->blksize) {
xchk_da_set_corrupt(ds, level);
return;
}
/* Check the name information. */
if (ent->flags & XFS_ATTR_LOCAL) {
lentry = xfs_attr3_leaf_name_local(leaf, idx);
namesize = xfs_attr_leaf_entsize_local(lentry->namelen,
be16_to_cpu(lentry->valuelen));
name_end = (char *)lentry + namesize;
if (lentry->namelen == 0)
xchk_da_set_corrupt(ds, level);
} else {
rentry = xfs_attr3_leaf_name_remote(leaf, idx);
namesize = xfs_attr_leaf_entsize_remote(rentry->namelen);
name_end = (char *)rentry + namesize;
if (rentry->namelen == 0 || rentry->valueblk == 0)
xchk_da_set_corrupt(ds, level);
}
if (name_end > buf_end)
xchk_da_set_corrupt(ds, level);
if (!xchk_xattr_set_map(ds->sc, usedmap, nameidx, namesize))
xchk_da_set_corrupt(ds, level);
if (!(ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
*usedbytes += namesize;
}
/* Scrub an attribute leaf. */
STATIC int
xchk_xattr_block(
struct
|