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xfs: validate explicit directory free block owners

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Port the existing directory freespace block header checking function to
accept an owner number instead of an xfs_inode, then update the
callsites to use xfs_da_args.owner when possible.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
2024-04-15 14:54:41 -07:00
parent 29b41ce919
commit fe6c9f8e48
4 changed files with 23 additions and 18 deletions
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32
fs/xfs/libxfs/xfs_dir2_node.c
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@@ -175,11 +175,11 @@ const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
/* Everything ok in the free block header? */
static xfs_failaddr_t
xfs_dir3_free_header_check(
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf *bp)
struct xfs_buf *bp,
xfs_ino_t owner,
xfs_dablk_t fbno)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_mount *mp = bp->b_mount;
int maxbests = mp->m_dir_geo->free_max_bests;
unsigned int firstdb;
@@ -195,7 +195,7 @@ xfs_dir3_free_header_check(
return __this_address;
if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
return __this_address;
if (be64_to_cpu(hdr3->hdr.owner) != dp->i_ino)
if (be64_to_cpu(hdr3->hdr.owner) != owner)
return __this_address;
} else {
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
@@ -214,6 +214,7 @@ static int
__xfs_dir3_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_ino_t owner,
xfs_dablk_t fbno,
unsigned int flags,
struct xfs_buf **bpp)
@@ -227,7 +228,7 @@ __xfs_dir3_free_read(
return err;
/* Check things that we can't do in the verifier. */
fa = xfs_dir3_free_header_check(dp, fbno, *bpp);
fa = xfs_dir3_free_header_check(*bpp, owner, fbno);
if (fa) {
__xfs_buf_mark_corrupt(*bpp, fa);
xfs_trans_brelse(tp, *bpp);
@@ -299,20 +300,23 @@ int
xfs_dir2_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_ino_t owner,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, 0, bpp);
return __xfs_dir3_free_read(tp, dp, owner, fbno, 0, bpp);
}
static int
xfs_dir2_free_try_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_ino_t owner,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, XFS_DABUF_MAP_HOLE_OK, bpp);
return __xfs_dir3_free_read(tp, dp, owner, fbno, XFS_DABUF_MAP_HOLE_OK,
bpp);
}
static int
@@ -717,7 +721,7 @@ xfs_dir2_leafn_lookup_for_addname(
if (curbp)
xfs_trans_brelse(tp, curbp);
error = xfs_dir2_free_read(tp, dp,
error = xfs_dir2_free_read(tp, dp, args->owner,
xfs_dir2_db_to_da(args->geo,
newfdb),
&curbp);
@@ -1356,8 +1360,8 @@ xfs_dir2_leafn_remove(
* read in the free block.
*/
fdb = xfs_dir2_db_to_fdb(geo, db);
error = xfs_dir2_free_read(tp, dp, xfs_dir2_db_to_da(geo, fdb),
&fbp);
error = xfs_dir2_free_read(tp, dp, args->owner,
xfs_dir2_db_to_da(geo, fdb), &fbp);
if (error)
return error;
free = fbp->b_addr;
@@ -1716,7 +1720,7 @@ xfs_dir2_node_add_datablk(
* that was just allocated.
*/
fbno = xfs_dir2_db_to_fdb(args->geo, *dbno);
error = xfs_dir2_free_try_read(tp, dp,
error = xfs_dir2_free_try_read(tp, dp, args->owner,
xfs_dir2_db_to_da(args->geo, fbno), &fbp);
if (error)
return error;
@@ -1863,7 +1867,7 @@ xfs_dir2_node_find_freeblk(
* so this might not succeed. This should be really rare, so
* there's no reason to avoid it.
*/
error = xfs_dir2_free_try_read(tp, dp,
error = xfs_dir2_free_try_read(tp, dp, args->owner,
xfs_dir2_db_to_da(args->geo, fbno),
&fbp);
if (error)
@@ -2302,7 +2306,7 @@ xfs_dir2_node_trim_free(
/*
* Read the freespace block.
*/
error = xfs_dir2_free_try_read(tp, dp, fo, &bp);
error = xfs_dir2_free_try_read(tp, dp, args->owner, fo, &bp);
if (error)
return error;
/*