diff options
author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-01-16 18:53:11 -0800 |
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committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-01-17 21:00:46 -0800 |
commit | cf1b0b8b1a43102cdc0189d76d1c05915c4e16a6 (patch) | |
tree | 779947ce4c0e554ae0ac2da2e31295df89e977fe /fs/xfs | |
parent | 561f648ab2bdbb43f2ecc5074854c11537f2aa6c (diff) | |
download | linux-cf1b0b8b1a43102cdc0189d76d1c05915c4e16a6.tar.bz2 |
xfs: scrub in-core metadata
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>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r-- | fs/xfs/scrub/agheader.c | 3 | ||||
-rw-r--r-- | fs/xfs/scrub/btree.c | 4 | ||||
-rw-r--r-- | fs/xfs/scrub/common.c | 23 | ||||
-rw-r--r-- | fs/xfs/scrub/common.h | 1 | ||||
-rw-r--r-- | fs/xfs/scrub/dabtree.c | 22 | ||||
-rw-r--r-- | fs/xfs/scrub/dir.c | 4 |
6 files changed, 57 insertions, 0 deletions
diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c index 20a3bebdee06..fd975524f460 100644 --- a/fs/xfs/scrub/agheader.c +++ b/fs/xfs/scrub/agheader.c @@ -611,6 +611,7 @@ 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); @@ -780,6 +781,7 @@ xfs_scrub_agfl( goto out; if (!sc->sa.agf_bp) return -EFSCORRUPTED; + xfs_scrub_buffer_recheck(sc, sc->sa.agfl_bp); xfs_scrub_agfl_xref(sc); @@ -902,6 +904,7 @@ 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 0589d4efbf6b..54218168c8f9 100644 --- a/fs/xfs/scrub/btree.c +++ b/fs/xfs/scrub/btree.c @@ -314,6 +314,8 @@ 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); @@ -486,6 +488,8 @@ 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 f5df8f2859d7..8033ab9d8f47 100644 --- a/fs/xfs/scrub/common.c +++ b/fs/xfs/scrub/common.c @@ -756,3 +756,26 @@ xfs_scrub_should_check_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 bf88a677f6e7..ddb65d22c76a 100644 --- a/fs/xfs/scrub/common.h +++ b/fs/xfs/scrub/common.h @@ -158,5 +158,6 @@ int xfs_scrub_setup_ag_btree(struct xfs_scrub_context *sc, int xfs_scrub_get_inode(struct xfs_scrub_context *sc, struct xfs_inode *ip_in); int xfs_scrub_setup_inode_contents(struct xfs_scrub_context *sc, struct xfs_inode *ip, unsigned int resblks); +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 d94edd93cba8..bffdb7dc09bf 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 e75826bb6516..f5a0d179eac0 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; |