From: Darrick J. Wong <djwong@xxxxxxxxxx>
Source kernel commit: f4887fbc41dcb1560ec5da982ac7c6ad04b71de5
Create a leaf block header checking function to validate the owner field
of xattr leaf blocks.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
libxfs/xfs_attr.c | 10 ++++-----
libxfs/xfs_attr_leaf.c | 56 ++++++++++++++++++++++++++++++++++++++++--------
libxfs/xfs_attr_leaf.h | 4 +++
libxfs/xfs_da_btree.c | 42 ++++++++++++++++++++++++++++++++++++
libxfs/xfs_da_btree.h | 1 +
libxfs/xfs_exchmaps.c | 3 ++-
6 files changed, 100 insertions(+), 16 deletions(-)
diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 21b5d922b..cc291cf76 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -647,8 +647,8 @@ xfs_attr_leaf_remove_attr(
int forkoff;
int error;
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
- &bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner,
+ args->blkno, &bp);
if (error)
return error;
@@ -679,7 +679,7 @@ xfs_attr_leaf_shrink(
if (!xfs_attr_is_leaf(dp))
return 0;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, &bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner, 0, &bp);
if (error)
return error;
@@ -1156,7 +1156,7 @@ xfs_attr_leaf_try_add(
struct xfs_buf *bp;
int error;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, &bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner, 0, &bp);
if (error)
return error;
@@ -1204,7 +1204,7 @@ xfs_attr_leaf_hasname(
{
int error = 0;
- error = xfs_attr3_leaf_read(args->trans, args->dp, 0, bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner, 0, bp);
if (error)
return error;
diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c
index ed3b63f8c..47f2836fb 100644
--- a/libxfs/xfs_attr_leaf.c
+++ b/libxfs/xfs_attr_leaf.c
@@ -385,6 +385,27 @@ xfs_attr3_leaf_verify(
return NULL;
}
+xfs_failaddr_t
+xfs_attr3_leaf_header_check(
+ struct xfs_buf *bp,
+ xfs_ino_t owner)
+{
+ struct xfs_mount *mp = bp->b_mount;
+
+ if (xfs_has_crc(mp)) {
+ struct xfs_attr3_leafblock *hdr3 = bp->b_addr;
+
+ if (hdr3->hdr.info.hdr.magic !=
+ cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
+ return __this_address;
+
+ if (be64_to_cpu(hdr3->hdr.info.owner) != owner)
+ return __this_address;
+ }
+
+ return NULL;
+}
+
static void
xfs_attr3_leaf_write_verify(
struct xfs_buf *bp)
@@ -445,16 +466,30 @@ int
xfs_attr3_leaf_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
+ xfs_ino_t owner,
xfs_dablk_t bno,
struct xfs_buf **bpp)
{
+ xfs_failaddr_t fa;
int err;
err = xfs_da_read_buf(tp, dp, bno, 0, bpp, XFS_ATTR_FORK,
&xfs_attr3_leaf_buf_ops);
- if (!err && tp && *bpp)
+ if (err || !(*bpp))
+ return err;
+
+ fa = xfs_attr3_leaf_header_check(*bpp, owner);
+ if (fa) {
+ __xfs_buf_mark_corrupt(*bpp, fa);
+ xfs_trans_brelse(tp, *bpp);
+ *bpp = NULL;
+ xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK);
+ return -EFSCORRUPTED;
+ }
+
+ if (tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_ATTR_LEAF_BUF);
- return err;
+ return 0;
}
/*========================================================================
@@ -1157,7 +1192,7 @@ xfs_attr3_leaf_to_node(
error = xfs_da_grow_inode(args, &blkno);
if (error)
goto out;
- error = xfs_attr3_leaf_read(args->trans, dp, 0, &bp1);
+ error = xfs_attr3_leaf_read(args->trans, dp, args->owner, 0, &bp1);
if (error)
goto out;
@@ -1992,7 +2027,7 @@ xfs_attr3_leaf_toosmall(
if (blkno == 0)
continue;
error = xfs_attr3_leaf_read(state->args->trans, state->args->dp,
- blkno, &bp);
+ state->args->owner, blkno, &bp);
if (error)
return error;
@@ -2714,7 +2749,8 @@ xfs_attr3_leaf_clearflag(
/*
* Set up the operation.
*/
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner,
+ args->blkno, &bp);
if (error)
return error;
@@ -2778,7 +2814,8 @@ xfs_attr3_leaf_setflag(
/*
* Set up the operation.
*/
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner,
+ args->blkno, &bp);
if (error)
return error;
@@ -2837,7 +2874,8 @@ xfs_attr3_leaf_flipflags(
/*
* Read the block containing the "old" attr
*/
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp1);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner,
+ args->blkno, &bp1);
if (error)
return error;
@@ -2845,8 +2883,8 @@ xfs_attr3_leaf_flipflags(
* Read the block containing the "new" attr, if it is different
*/
if (args->blkno2 != args->blkno) {
- error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno2,
- &bp2);
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->owner,
+ args->blkno2, &bp2);
if (error)
return error;
} else {
diff --git a/libxfs/xfs_attr_leaf.h b/libxfs/xfs_attr_leaf.h
index 9b9948639..bac219589 100644
--- a/libxfs/xfs_attr_leaf.h
+++ b/libxfs/xfs_attr_leaf.h
@@ -98,12 +98,14 @@ int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
struct xfs_buf *leaf2_bp);
int xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
int xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
- xfs_dablk_t bno, struct xfs_buf **bpp);
+ xfs_ino_t owner, xfs_dablk_t bno, struct xfs_buf **bpp);
void xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
struct xfs_attr3_icleaf_hdr *to,
struct xfs_attr_leafblock *from);
void xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo,
struct xfs_attr_leafblock *to,
struct xfs_attr3_icleaf_hdr *from);
+xfs_failaddr_t xfs_attr3_leaf_header_check(struct xfs_buf *bp,
+ xfs_ino_t owner);
#endif /* __XFS_ATTR_LEAF_H__ */
diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index 3ad58ab04..28fd87c2d 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -248,6 +248,25 @@ xfs_da3_node_verify(
return NULL;
}
+xfs_failaddr_t
+xfs_da3_header_check(
+ struct xfs_buf *bp,
+ xfs_ino_t owner)
+{
+ struct xfs_mount *mp = bp->b_mount;
+ struct xfs_da_blkinfo *hdr = bp->b_addr;
+
+ if (!xfs_has_crc(mp))
+ return NULL;
+
+ switch (hdr->magic) {
+ case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
+ return xfs_attr3_leaf_header_check(bp, owner);
+ }
+
+ return NULL;
+}
+
static void
xfs_da3_node_write_verify(
struct xfs_buf *bp)
@@ -1587,6 +1606,7 @@ xfs_da3_node_lookup_int(
struct xfs_da_node_entry *btree;
struct xfs_da3_icnode_hdr nodehdr;
struct xfs_da_args *args;
+ xfs_failaddr_t fa;
xfs_dablk_t blkno;
xfs_dahash_t hashval;
xfs_dahash_t btreehashval;
@@ -1625,6 +1645,12 @@ xfs_da3_node_lookup_int(
if (magic == XFS_ATTR_LEAF_MAGIC ||
magic == XFS_ATTR3_LEAF_MAGIC) {
+ fa = xfs_attr3_leaf_header_check(blk->bp, args->owner);
+ if (fa) {
+ __xfs_buf_mark_corrupt(blk->bp, fa);
+ xfs_da_mark_sick(args);
+ return -EFSCORRUPTED;
+ }
blk->magic = XFS_ATTR_LEAF_MAGIC;
blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
break;
@@ -1992,6 +2018,7 @@ xfs_da3_path_shift(
struct xfs_da_node_entry *btree;
struct xfs_da3_icnode_hdr nodehdr;
struct xfs_buf *bp;
+ xfs_failaddr_t fa;
xfs_dablk_t blkno = 0;
int level;
int error;
@@ -2083,6 +2110,12 @@ xfs_da3_path_shift(
break;
case XFS_ATTR_LEAF_MAGIC:
case XFS_ATTR3_LEAF_MAGIC:
+ fa = xfs_attr3_leaf_header_check(blk->bp, args->owner);
+ if (fa) {
+ __xfs_buf_mark_corrupt(blk->bp, fa);
+ xfs_da_mark_sick(args);
+ return -EFSCORRUPTED;
+ }
blk->magic = XFS_ATTR_LEAF_MAGIC;
ASSERT(level == path->active-1);
blk->index = 0;
@@ -2286,6 +2319,7 @@ xfs_da3_swap_lastblock(
struct xfs_buf *last_buf;
struct xfs_buf *sib_buf;
struct xfs_buf *par_buf;
+ xfs_failaddr_t fa;
xfs_dahash_t dead_hash;
xfs_fileoff_t lastoff;
xfs_dablk_t dead_blkno;
@@ -2322,6 +2356,14 @@ xfs_da3_swap_lastblock(
error = xfs_da3_node_read(tp, dp, last_blkno, &last_buf, w);
if (error)
return error;
+ fa = xfs_da3_header_check(last_buf, args->owner);
+ if (fa) {
+ __xfs_buf_mark_corrupt(last_buf, fa);
+ xfs_trans_brelse(tp, last_buf);
+ xfs_da_mark_sick(args);
+ return -EFSCORRUPTED;
+ }
+
/*
* Copy the last block into the dead buffer and log it.
*/
diff --git a/libxfs/xfs_da_btree.h b/libxfs/xfs_da_btree.h
index 7fb13f26e..99618e0c8 100644
--- a/libxfs/xfs_da_btree.h
+++ b/libxfs/xfs_da_btree.h
@@ -236,6 +236,7 @@ void xfs_da3_node_hdr_from_disk(struct xfs_mount *mp,
struct xfs_da3_icnode_hdr *to, struct xfs_da_intnode *from);
void xfs_da3_node_hdr_to_disk(struct xfs_mount *mp,
struct xfs_da_intnode *to, struct xfs_da3_icnode_hdr *from);
+xfs_failaddr_t xfs_da3_header_check(struct xfs_buf *bp, xfs_ino_t owner);
extern struct kmem_cache *xfs_da_state_cache;
diff --git a/libxfs/xfs_exchmaps.c b/libxfs/xfs_exchmaps.c
index 6160beef1..21c501aab 100644
--- a/libxfs/xfs_exchmaps.c
+++ b/libxfs/xfs_exchmaps.c
@@ -435,7 +435,8 @@ xfs_exchmaps_attr_to_sf(
if (!xfs_attr_is_leaf(xmi->xmi_ip2))
return 0;
- error = xfs_attr3_leaf_read(tp, xmi->xmi_ip2, 0, &bp);
+ error = xfs_attr3_leaf_read(tp, xmi->xmi_ip2, xmi->xmi_ip2->i_ino, 0,
+ &bp);
if (error)
return error;
