[PATCH 9/9] xfs: validate explicit directory free block owners

Darrick J. Wong
2023-12-31T22:34:37Z

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>
---
libxfs/xfs_dir2_leaf.c | 3 ++-
libxfs/xfs_dir2_node.c | 32 ++++++++++++++++++--------------
libxfs/xfs_dir2_priv.h | 2 +-
3 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/libxfs/xfs_dir2_leaf.c b/libxfs/xfs_dir2_leaf.c
index dd2bb2bc8b6..77eca816c66 100644
--- a/libxfs/xfs_dir2_leaf.c
+++ b/libxfs/xfs_dir2_leaf.c
@@ -1803,7 +1803,8 @@ xfs_dir2_node_to_leaf(
/*
* Read the freespace block.
*/
- error = xfs_dir2_free_read(tp, dp, args->geo->freeblk, &fbp);
+ error = xfs_dir2_free_read(tp, dp, args->owner, args->geo->freeblk,
+ &fbp);
if (error)
return error;
xfs_dir2_free_hdr_from_disk(mp, &freehdr, fbp->b_addr);
diff --git a/libxfs/xfs_dir2_node.c b/libxfs/xfs_dir2_node.c
index 69040737418..c94d00eb99c 100644
--- a/libxfs/xfs_dir2_node.c
+++ b/libxfs/xfs_dir2_node.c
@@ -172,11 +172,11 @@ 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;

@@ -192,7 +192,7 @@ 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;
@@ -211,6 +211,7 @@ 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)
@@ -224,7 +225,7 @@ __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);
@@ -296,20 +297,23 @@ 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
@@ -714,7 +718,7 @@ 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);
@@ -1353,8 +1357,8 @@ 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;
@@ -1713,7 +1717,7 @@ 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;
@@ -1860,7 +1864,7 @@ 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)
@@ -2299,7 +2303,7 @@ 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;
/*
diff --git a/libxfs/xfs_dir2_priv.h b/libxfs/xfs_dir2_priv.h
index 969e36a03fe..f9bc280e8c2 100644
--- a/libxfs/xfs_dir2_priv.h
+++ b/libxfs/xfs_dir2_priv.h
@@ -156,7 +156,7 @@ extern int xfs_dir2_node_replace(struct xfs_da_args *args);
extern int xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo,
int *rvalp);
extern int xfs_dir2_free_read(struct xfs_trans *tp, struct xfs_inode *dp,
- xfs_dablk_t fbno, struct xfs_buf **bpp);
+ xfs_ino_t owner, xfs_dablk_t fbno, struct xfs_buf **bpp);

/* xfs_dir2_sf.c */
xfs_ino_t xfs_dir2_sf_get_ino(struct xfs_mount *mp, struct xfs_dir2_sf_hdr *hdr,