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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org
Subject: [PATCH 13/13] xfs: scrub in-core metadata
Date: Wed, 13 Dec 2017 15:59:32 -0800	[thread overview]
Message-ID: <151320957218.30654.113836892237178906.stgit@magnolia> (raw)
In-Reply-To: <151320949282.30654.14805160700975182459.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

Whenever we load a buffer, explicitly re-call the structure verifier to
ensure that memory isn't corrupting things.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/scrub/agheader.c |    3 +++
 fs/xfs/scrub/btree.c    |    4 ++++
 fs/xfs/scrub/common.c   |   23 +++++++++++++++++++++++
 fs/xfs/scrub/common.h   |    2 ++
 fs/xfs/scrub/dabtree.c  |   22 ++++++++++++++++++++++
 fs/xfs/scrub/dir.c      |    4 ++++
 6 files changed, 58 insertions(+)


diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index 1503cbc..2632e00 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -571,6 +571,7 @@ xfs_scrub_agf(
 			&sc->sa.agf_bp, &sc->sa.agfl_bp);
 	if (!xfs_scrub_process_error(sc, agno, XFS_AGF_BLOCK(sc->mp), &error))
 		goto out;
+	xfs_scrub_buffer_recheck(sc, sc->sa.agf_bp);
 
 	agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
 
@@ -742,6 +743,7 @@ xfs_scrub_agfl(
 		goto out;
 	if (!sc->sa.agf_bp)
 		return -EFSCORRUPTED;
+	xfs_scrub_buffer_recheck(sc, sc->sa.agfl_bp);
 
 	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 		goto out;
@@ -855,6 +857,7 @@ xfs_scrub_agi(
 			&sc->sa.agf_bp, &sc->sa.agfl_bp);
 	if (!xfs_scrub_process_error(sc, agno, XFS_AGI_BLOCK(sc->mp), &error))
 		goto out;
+	xfs_scrub_buffer_recheck(sc, sc->sa.agi_bp);
 
 	agi = XFS_BUF_TO_AGI(sc->sa.agi_bp);
 
diff --git a/fs/xfs/scrub/btree.c b/fs/xfs/scrub/btree.c
index 26149cb..b30f30b 100644
--- a/fs/xfs/scrub/btree.c
+++ b/fs/xfs/scrub/btree.c
@@ -312,6 +312,8 @@ xfs_scrub_btree_block_check_sibling(
 	pp = xfs_btree_ptr_addr(ncur, ncur->bc_ptrs[level + 1], pblock);
 	if (!xfs_scrub_btree_ptr_ok(bs, level + 1, pp))
 		goto out;
+	if (pbp)
+		xfs_scrub_buffer_recheck(bs->sc, pbp);
 
 	if (xfs_btree_diff_two_ptrs(cur, pp, sibling))
 		xfs_scrub_btree_set_corrupt(bs->sc, cur, level);
@@ -481,6 +483,8 @@ xfs_scrub_btree_get_block(
 		xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, level);
 		return 0;
 	}
+	if (*pbp)
+		xfs_scrub_buffer_recheck(bs->sc, *pbp);
 
 	/*
 	 * Check the block's owner; this function absorbs error codes
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index c36a91b..1e1d843 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -729,3 +729,26 @@ xfs_scrub_should_xref(
 	*error = 0;
 	return false;
 }
+
+/* Run the structure verifiers on in-memory buffers to detect bad memory. */
+void
+xfs_scrub_buffer_recheck(
+	struct xfs_scrub_context	*sc,
+	struct xfs_buf			*bp)
+{
+	xfs_failaddr_t			fa;
+
+	if (bp->b_ops == NULL) {
+		xfs_scrub_block_set_corrupt(sc, bp);
+		return;
+	}
+	if (bp->b_ops->verify_struct == NULL) {
+		xfs_scrub_set_incomplete(sc);
+		return;
+	}
+	fa = bp->b_ops->verify_struct(bp);
+	if (!fa)
+		return;
+	sc->sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
+	trace_xfs_scrub_block_error(sc, bp->b_bn, fa);
+}
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index 4f6a6e1..4db5e11 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -165,4 +165,6 @@ static inline __u32 xfs_scrub_corrupt_flag(bool xref)
 	return xref ? XFS_SCRUB_OFLAG_XCORRUPT : XFS_SCRUB_OFLAG_CORRUPT;
 }
 
+void xfs_scrub_buffer_recheck(struct xfs_scrub_context *sc, struct xfs_buf *bp);
+
 #endif	/* __XFS_SCRUB_COMMON_H__ */
diff --git a/fs/xfs/scrub/dabtree.c b/fs/xfs/scrub/dabtree.c
index d94edd9..bffdb7d 100644
--- a/fs/xfs/scrub/dabtree.c
+++ b/fs/xfs/scrub/dabtree.c
@@ -233,11 +233,28 @@ xfs_scrub_da_btree_write_verify(
 		return;
 	}
 }
+static void *
+xfs_scrub_da_btree_verify(
+	struct xfs_buf		*bp)
+{
+	struct xfs_da_blkinfo	*info = bp->b_addr;
+
+	switch (be16_to_cpu(info->magic)) {
+	case XFS_DIR2_LEAF1_MAGIC:
+	case XFS_DIR3_LEAF1_MAGIC:
+		bp->b_ops = &xfs_dir3_leaf1_buf_ops;
+		return bp->b_ops->verify_struct(bp);
+	default:
+		bp->b_ops = &xfs_da3_node_buf_ops;
+		return bp->b_ops->verify_struct(bp);
+	}
+}
 
 static const struct xfs_buf_ops xfs_scrub_da_btree_buf_ops = {
 	.name = "xfs_scrub_da_btree",
 	.verify_read = xfs_scrub_da_btree_read_verify,
 	.verify_write = xfs_scrub_da_btree_write_verify,
+	.verify_struct = xfs_scrub_da_btree_verify,
 };
 
 /* Check a block's sibling. */
@@ -276,6 +293,9 @@ xfs_scrub_da_btree_block_check_sibling(
 		xfs_scrub_da_set_corrupt(ds, level);
 		return error;
 	}
+	if (ds->state->altpath.blk[level].bp)
+		xfs_scrub_buffer_recheck(ds->sc,
+				ds->state->altpath.blk[level].bp);
 
 	/* Compare upper level pointer to sibling pointer. */
 	if (ds->state->altpath.blk[level].blkno != sibling)
@@ -358,6 +378,8 @@ xfs_scrub_da_btree_block(
 			&xfs_scrub_da_btree_buf_ops);
 	if (!xfs_scrub_da_process_error(ds, level, &error))
 		goto out_nobuf;
+	if (blk->bp)
+		xfs_scrub_buffer_recheck(ds->sc, blk->bp);
 
 	/*
 	 * We didn't find a dir btree root block, which means that
diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index 69e1efd..0a4e768 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -237,6 +237,7 @@ xfs_scrub_dir_rec(
 		xfs_scrub_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
 		goto out;
 	}
+	xfs_scrub_buffer_recheck(ds->sc, bp);
 
 	/* Retrieve the entry, sanity check it, and compare hashes. */
 	dent = (struct xfs_dir2_data_entry *)(((char *)bp->b_addr) + off);
@@ -324,6 +325,7 @@ xfs_scrub_directory_data_bestfree(
 	}
 	if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
 		goto out;
+	xfs_scrub_buffer_recheck(sc, bp);
 
 	/* XXX: Check xfs_dir3_data_hdr.pad is zero once we start setting it. */
 
@@ -474,6 +476,7 @@ xfs_scrub_directory_leaf1_bestfree(
 	error = xfs_dir3_leaf_read(sc->tp, sc->ip, lblk, -1, &bp);
 	if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
 		goto out;
+	xfs_scrub_buffer_recheck(sc, bp);
 
 	leaf = bp->b_addr;
 	d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
@@ -559,6 +562,7 @@ xfs_scrub_directory_free_bestfree(
 	error = xfs_dir2_free_read(sc->tp, sc->ip, lblk, &bp);
 	if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
 		goto out;
+	xfs_scrub_buffer_recheck(sc, bp);
 
 	if (xfs_sb_version_hascrc(&sc->mp->m_sb)) {
 		struct xfs_dir3_free_hdr	*hdr3 = bp->b_addr;


  parent reply	other threads:[~2017-12-13 23:59 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-13 23:58 [PATCH 00/13] xfs: more and better verifiers Darrick J. Wong
2017-12-13 23:58 ` [PATCH 01/13] xfs: refactor long-format btree header verification routines Darrick J. Wong
2017-12-14 22:06   ` Dave Chinner
2017-12-15  0:12     ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 02/13] xfs: remove XFS_WANT_CORRUPTED_RETURN from dir3 data verifiers Darrick J. Wong
2017-12-19  3:50   ` Dave Chinner
2017-12-13 23:58 ` [PATCH 03/13] xfs: have buffer verifier functions report failing address Darrick J. Wong
2017-12-19  4:12   ` Dave Chinner
2017-12-19 20:26     ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 04/13] xfs: refactor verifier callers to print address of failing check Darrick J. Wong
2017-12-14 22:03   ` Dave Chinner
2017-12-15  0:04     ` Darrick J. Wong
2017-12-15  3:09       ` Dave Chinner
2017-12-19 20:29         ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 05/13] xfs: verify dinode header first Darrick J. Wong
2017-12-19  4:13   ` Dave Chinner
2017-12-13 23:58 ` [PATCH 06/13] xfs: move inode fork verifiers to xfs_dinode_verify Darrick J. Wong
2017-12-19  5:16   ` Dave Chinner
2017-12-19 20:34     ` Darrick J. Wong
2017-12-19 20:48       ` Dave Chinner
2017-12-13 23:58 ` [PATCH 07/13] xfs: create structure verifier function for shortform xattrs Darrick J. Wong
2017-12-19  5:23   ` Dave Chinner
2017-12-19 20:41     ` Darrick J. Wong
2017-12-19 20:51       ` Dave Chinner
2017-12-19 21:04         ` Darrick J. Wong
2017-12-13 23:59 ` [PATCH 08/13] xfs: create structure verifier function for short form symlinks Darrick J. Wong
2017-12-19  5:27   ` Dave Chinner
2017-12-19 20:45     ` Darrick J. Wong
2017-12-13 23:59 ` [PATCH 09/13] xfs: refactor short form directory structure verifier function Darrick J. Wong
2017-12-19  5:45   ` Dave Chinner
2017-12-13 23:59 ` [PATCH 10/13] xfs: provide a centralized method for verifying inline fork data Darrick J. Wong
2017-12-19  6:06   ` Dave Chinner
2017-12-19 20:50     ` Darrick J. Wong
2017-12-13 23:59 ` [PATCH 11/13] xfs: fail out of xfs_attr3_leaf_lookup_int if it looks corrupt Darrick J. Wong
2017-12-19  6:13   ` Dave Chinner
2017-12-13 23:59 ` [PATCH 12/13] xfs: create a new buf_ops pointer to verify structure metadata Darrick J. Wong
2017-12-19  6:22   ` Dave Chinner
2017-12-19 18:15     ` Darrick J. Wong
2017-12-19 20:53       ` Dave Chinner
2017-12-13 23:59 ` Darrick J. Wong [this message]
2017-12-19  6:23   ` [PATCH 13/13] xfs: scrub in-core metadata Dave Chinner

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