[04/10] xfs: validate attr leaf buffer owners

Message ID	171150382191.3217370.3906320238339446237.stgit@frogsfrogsfrogs (mailing list archive)
State	Superseded
Headers	show Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B10FC20315 for <linux-xfs@vger.kernel.org>; Wed, 27 Mar 2024 01:59:37 +0000 (UTC) Date: Tue, 26 Mar 2024 18:59:37 -0700 Subject: [PATCH 04/10] xfs: validate attr leaf buffer owners From: "Darrick J. Wong" <djwong@kernel.org> To: djwong@kernel.org Cc: Christoph Hellwig <hch@lst.de>, hch@lst.de, linux-xfs@vger.kernel.org Message-ID: <171150382191.3217370.3906320238339446237.stgit@frogsfrogsfrogs> In-Reply-To: <171150382098.3217370.5208665628669220587.stgit@frogsfrogsfrogs> References: <171150382098.3217370.5208665628669220587.stgit@frogsfrogsfrogs> User-Agent: StGit/0.19 Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit
Series	[01/10] xfs: add an explicit owner field to xfs_da_args \| expand [01/10] xfs: add an explicit owner field to xfs_da_args [02/10] xfs: use the xfs_da_args owner field to set new dir/attr block owner [03/10] xfs: reduce indenting in xfs_attr_node_list [04/10] xfs: validate attr leaf buffer owners [05/10] xfs: validate attr remote value buffer owners [06/10] xfs: validate dabtree node buffer owners [07/10] xfs: validate directory leaf buffer owners [08/10] xfs: validate explicit directory data buffer owners [09/10] xfs: validate explicit directory block buffer owners [10/10] xfs: validate explicit directory free block owners

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c index 74d7694614434..b3c9666cd0115 100644 --- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c @@ -649,8 +649,8 @@ 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; @@ -681,7 +681,7 @@ 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; @@ -1158,7 +1158,7 @@ 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; @@ -1206,7 +1206,7 @@ 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/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index 8937c034b3309..0e0faa19d4da6 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -388,6 +388,26 @@ 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; + + ASSERT(hdr3->hdr.info.hdr.magic == + cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)); + + 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) @@ -448,16 +468,30 @@ 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; } /*======================================================================== @@ -1160,7 +1194,7 @@ 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; @@ -1995,7 +2029,7 @@ 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; @@ -2717,7 +2751,8 @@ 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; @@ -2781,7 +2816,8 @@ 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; @@ -2840,7 +2876,8 @@ 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; @@ -2848,8 +2885,8 @@ 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/fs/xfs/libxfs/xfs_attr_leaf.h b/fs/xfs/libxfs/xfs_attr_leaf.h index 9b9948639c0fb..bac219589896a 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.h +++ b/fs/xfs/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/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c index 743f6421cc04f..65eef87751871 100644 --- a/fs/xfs/libxfs/xfs_da_btree.c +++ b/fs/xfs/libxfs/xfs_da_btree.c @@ -252,6 +252,25 @@ 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) @@ -1591,6 +1610,7 @@ 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; @@ -1629,6 +1649,12 @@ 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; @@ -1996,6 +2022,7 @@ 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; @@ -2087,6 +2114,12 @@ 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; @@ -2290,6 +2323,7 @@ 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; @@ -2326,6 +2360,14 @@ 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/fs/xfs/libxfs/xfs_da_btree.h b/fs/xfs/libxfs/xfs_da_btree.h index 7fb13f26edaa7..99618e0c8a72b 100644 --- a/fs/xfs/libxfs/xfs_da_btree.h +++ b/fs/xfs/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/fs/xfs/libxfs/xfs_exchmaps.c b/fs/xfs/libxfs/xfs_exchmaps.c index 70e17ce44810e..55085d00e4046 100644 --- a/fs/xfs/libxfs/xfs_exchmaps.c +++ b/fs/xfs/libxfs/xfs_exchmaps.c @@ -438,7 +438,8 @@ 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; diff --git a/fs/xfs/scrub/dabtree.c b/fs/xfs/scrub/dabtree.c index fa6385a99ac4e..c71254088dffe 100644 --- a/fs/xfs/scrub/dabtree.c +++ b/fs/xfs/scrub/dabtree.c @@ -320,6 +320,7 @@ xchk_da_btree_block( struct xfs_da3_blkinfo *hdr3; struct xfs_da_args *dargs = &ds->dargs; struct xfs_inode *ip = ds->dargs.dp; + xfs_failaddr_t fa; xfs_ino_t owner; int *pmaxrecs; struct xfs_da3_icnode_hdr nodehdr; @@ -442,6 +443,12 @@ xchk_da_btree_block( goto out_freebp; } + fa = xfs_da3_header_check(blk->bp, dargs->owner); + if (fa) { + xchk_da_set_corrupt(ds, level); + goto out_freebp; + } + /* * If we've been handed a block that is below the dabtree root, does * its hashval match what the parent block expected to see? diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c index 42a575db72678..f6496e33ff91b 100644 --- a/fs/xfs/xfs_attr_list.c +++ b/fs/xfs/xfs_attr_list.c @@ -214,6 +214,7 @@ xfs_attr_node_list_lookup( struct xfs_mount *mp = dp->i_mount; struct xfs_trans *tp = context->tp; struct xfs_buf *bp; + xfs_failaddr_t fa; int i; int error = 0; unsigned int expected_level = 0; @@ -273,6 +274,12 @@ xfs_attr_node_list_lookup( } } + fa = xfs_attr3_leaf_header_check(bp, dp->i_ino); + if (fa) { + __xfs_buf_mark_corrupt(bp, fa); + goto out_releasebuf; + } + if (expected_level != 0) goto out_corruptbuf; @@ -281,6 +288,7 @@ xfs_attr_node_list_lookup( out_corruptbuf: xfs_buf_mark_corrupt(bp); +out_releasebuf: xfs_trans_brelse(tp, bp); xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK); return -EFSCORRUPTED; @@ -297,6 +305,7 @@ xfs_attr_node_list( struct xfs_buf *bp; struct xfs_inode *dp = context->dp; struct xfs_mount *mp = dp->i_mount; + xfs_failaddr_t fa; int error = 0; trace_xfs_attr_node_list(context); @@ -332,6 +341,14 @@ xfs_attr_node_list( case XFS_ATTR_LEAF_MAGIC: case XFS_ATTR3_LEAF_MAGIC: leaf = bp->b_addr; + fa = xfs_attr3_leaf_header_check(bp, dp->i_ino); + if (fa) { + __xfs_buf_mark_corrupt(bp, fa); + xfs_trans_brelse(context->tp, bp); + xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK); + bp = NULL; + break; + } xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf); entries = xfs_attr3_leaf_entryp(leaf); @@ -382,8 +399,8 @@ xfs_attr_node_list( break; cursor->blkno = leafhdr.forw; xfs_trans_brelse(context->tp, bp); - error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno, - &bp); + error = xfs_attr3_leaf_read(context->tp, dp, dp->i_ino, + cursor->blkno, &bp); if (error) return error; } @@ -503,7 +520,8 @@ xfs_attr_leaf_list( trace_xfs_attr_leaf_list(context); context->cursor.blkno = 0; - error = xfs_attr3_leaf_read(context->tp, context->dp, 0, &bp); + error = xfs_attr3_leaf_read(context->tp, context->dp, + context->dp->i_ino, 0, &bp); if (error) return error;

[04/10] xfs: validate attr leaf buffer owners

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