From: "Darrick J. Wong" <djwong@kernel.org>
To: aalbersh@redhat.com, ebiggers@kernel.org, djwong@kernel.org
Cc: linux-xfs@vger.kernel.org, alexl@redhat.com, walters@verbum.org,
fsverity@lists.linux.dev, linux-fsdevel@vger.kernel.org
Subject: [PATCH 05/26] xfs: use an empty transaction to protect xfs_attr_get from deadlocks
Date: Mon, 29 Apr 2024 20:25:24 -0700 [thread overview]
Message-ID: <171444680446.957659.9938547111608933605.stgit@frogsfrogsfrogs> (raw)
In-Reply-To: <171444680291.957659.15782417454902691461.stgit@frogsfrogsfrogs>
From: Darrick J. Wong <djwong@kernel.org>
Wrap the xfs_attr_get_ilocked call in xfs_attr_get with an empty
transaction so that we cannot livelock the kernel if someone injects a
loop into the attr structure or the attr fork bmbt.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_attr.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index b841096947acb..e0be8d0c1ffdc 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -274,6 +274,8 @@ xfs_attr_get(
XFS_STATS_INC(args->dp->i_mount, xs_attr_get);
+ ASSERT(!args->trans);
+
if (xfs_is_shutdown(args->dp->i_mount))
return -EIO;
@@ -286,8 +288,27 @@ xfs_attr_get(
/* Entirely possible to look up a name which doesn't exist */
args->op_flags = XFS_DA_OP_OKNOENT;
+ error = xfs_trans_alloc_empty(args->dp->i_mount, &args->trans);
+ if (error)
+ return error;
+
lock_mode = xfs_ilock_attr_map_shared(args->dp);
+
+ /*
+ * Make sure the attr fork iext tree is loaded. Use the empty
+ * transaction to load the bmbt so that we avoid livelocking on loops.
+ */
+ if (xfs_inode_hasattr(args->dp)) {
+ error = xfs_iread_extents(args->trans, args->dp, XFS_ATTR_FORK);
+ if (error)
+ goto out_cancel;
+ }
+
error = xfs_attr_get_ilocked(args);
+
+out_cancel:
+ xfs_trans_cancel(args->trans);
+ args->trans = NULL;
xfs_iunlock(args->dp, lock_mode);
return error;
next prev parent reply other threads:[~2024-04-30 3:25 UTC|newest]
Thread overview: 165+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 3:11 [PATCHBOMB v5.6] fs-verity support for XFS Darrick J. Wong
2024-04-30 3:18 ` [PATCHSET v5.6 1/2] fs-verity: support merkle tree access by blocks Darrick J. Wong
2024-04-30 3:19 ` [PATCH 01/18] fs: add FS_XFLAG_VERITY for verity files Darrick J. Wong
2024-04-30 3:19 ` [PATCH 02/18] fsverity: pass tree_blocksize to end_enable_verity() Darrick J. Wong
2024-04-30 3:20 ` [PATCH 03/18] fsverity: convert verification to use byte instead of page offsets Darrick J. Wong
2024-05-01 7:33 ` Christoph Hellwig
2024-05-01 22:33 ` Darrick J. Wong
2024-05-02 0:42 ` Eric Biggers
2024-05-08 20:14 ` Darrick J. Wong
2024-04-30 3:20 ` [PATCH 04/18] fsverity: support block-based Merkle tree caching Darrick J. Wong
2024-05-01 7:36 ` Christoph Hellwig
2024-05-01 22:35 ` Darrick J. Wong
2024-05-02 4:42 ` Christoph Hellwig
2024-05-15 2:16 ` Eric Biggers
2024-04-30 3:20 ` [PATCH 05/18] fsverity: pass the merkle tree block level to fsverity_read_merkle_tree_block Darrick J. Wong
2024-04-30 3:20 ` [PATCH 06/18] fsverity: add per-sb workqueue for post read processing Darrick J. Wong
2024-04-30 3:21 ` [PATCH 07/18] fsverity: add tracepoints Darrick J. Wong
2024-04-30 3:21 ` [PATCH 08/18] fsverity: pass the new tree size and block size to ->begin_enable_verity Darrick J. Wong
2024-04-30 3:21 ` [PATCH 09/18] fsverity: expose merkle tree geometry to callers Darrick J. Wong
2024-04-30 3:22 ` [PATCH 10/18] fsverity: box up the write_merkle_tree_block parameters too Darrick J. Wong
2024-04-30 3:22 ` [PATCH 11/18] fsverity: pass the zero-hash value to the implementation Darrick J. Wong
2024-04-30 3:22 ` [PATCH 12/18] fsverity: report validation errors back to the filesystem Darrick J. Wong
2024-04-30 3:22 ` [PATCH 13/18] fsverity: pass super_block to fsverity_enqueue_verify_work Darrick J. Wong
2024-04-30 3:23 ` [PATCH 14/18] ext4: use a per-superblock fsverity workqueue Darrick J. Wong
2024-04-30 3:23 ` [PATCH 15/18] f2fs: " Darrick J. Wong
2024-04-30 3:23 ` [PATCH 16/18] btrfs: " Darrick J. Wong
2024-04-30 3:23 ` [PATCH 17/18] fsverity: remove system-wide workqueue Darrick J. Wong
2024-04-30 3:24 ` [PATCH 18/18] iomap: integrate fs-verity verification into iomap's read path Darrick J. Wong
2024-05-01 7:10 ` Christoph Hellwig
2024-05-01 22:37 ` Darrick J. Wong
2024-04-30 3:18 ` [PATCHSET v5.6 2/2] xfs: fs-verity support Darrick J. Wong
2024-04-30 3:24 ` [PATCH 01/26] xfs: use unsigned ints for non-negative quantities in xfs_attr_remote.c Darrick J. Wong
2024-05-01 6:55 ` Christoph Hellwig
2024-05-01 22:39 ` Darrick J. Wong
2024-05-02 4:56 ` Christoph Hellwig
2024-05-02 5:56 ` Chandan Babu R
2024-05-02 6:34 ` Christoph Hellwig
2024-04-30 3:24 ` [PATCH 02/26] xfs: turn XFS_ATTR3_RMT_BUF_SPACE into a function Darrick J. Wong
2024-05-01 6:55 ` Christoph Hellwig
2024-04-30 3:24 ` [PATCH 03/26] xfs: create a helper to compute the blockcount of a max sized remote value Darrick J. Wong
2024-05-01 6:56 ` Christoph Hellwig
2024-04-30 3:25 ` [PATCH 04/26] xfs: minor cleanups of xfs_attr3_rmt_blocks Darrick J. Wong
2024-05-01 6:56 ` Christoph Hellwig
2024-04-30 3:25 ` Darrick J. Wong [this message]
2024-05-01 6:57 ` [PATCH 05/26] xfs: use an empty transaction to protect xfs_attr_get from deadlocks Christoph Hellwig
2024-05-01 22:42 ` Darrick J. Wong
2024-04-30 3:25 ` [PATCH 06/26] xfs: add attribute type for fs-verity Darrick J. Wong
2024-04-30 3:25 ` [PATCH 07/26] xfs: do not use xfs_attr3_rmt_hdr for remote verity value blocks Darrick J. Wong
2024-04-30 3:26 ` [PATCH 08/26] xfs: add fs-verity ro-compat flag Darrick J. Wong
2024-04-30 3:26 ` [PATCH 09/26] xfs: add inode on-disk VERITY flag Darrick J. Wong
2024-04-30 3:26 ` [PATCH 10/26] xfs: initialize fs-verity on file open and cleanup on inode destruction Darrick J. Wong
2024-04-30 3:26 ` [PATCH 11/26] xfs: don't allow to enable DAX on fs-verity sealed inode Darrick J. Wong
2024-04-30 3:27 ` [PATCH 12/26] xfs: disable direct read path for fs-verity files Darrick J. Wong
2024-04-30 3:27 ` [PATCH 13/26] xfs: widen flags argument to the xfs_iflags_* helpers Darrick J. Wong
2024-05-01 6:54 ` Christoph Hellwig
2024-05-01 22:44 ` Darrick J. Wong
2024-04-30 3:27 ` [PATCH 14/26] xfs: add fs-verity support Darrick J. Wong
2024-04-30 3:28 ` [PATCH 15/26] xfs: create a per-mount shrinker for verity inodes merkle tree blocks Darrick J. Wong
2024-04-30 3:28 ` [PATCH 16/26] xfs: shrink verity blob cache Darrick J. Wong
2024-04-30 3:28 ` [PATCH 17/26] xfs: don't store trailing zeroes of merkle tree blocks Darrick J. Wong
2024-04-30 3:28 ` [PATCH 18/26] xfs: use merkle tree offset as attr hash Darrick J. Wong
2024-05-01 6:53 ` Christoph Hellwig
2024-05-01 7:23 ` Christoph Hellwig
2024-05-07 21:24 ` Darrick J. Wong
2024-05-08 11:47 ` Christoph Hellwig
2024-05-08 20:26 ` Darrick J. Wong
2024-05-09 5:02 ` Christoph Hellwig
2024-05-09 20:02 ` Darrick J. Wong
2024-05-10 5:08 ` Christoph Hellwig
2024-05-10 6:20 ` Christoph Hellwig
2024-05-17 17:17 ` Darrick J. Wong
2024-05-20 12:39 ` Christoph Hellwig
2024-05-20 16:02 ` Darrick J. Wong
2024-05-22 14:37 ` Christoph Hellwig
2024-05-22 18:29 ` Eric Biggers
2024-05-31 21:28 ` Darrick J. Wong
2024-05-31 21:45 ` Eric Biggers
2024-05-09 17:46 ` Eric Biggers
2024-05-09 18:04 ` Darrick J. Wong
2024-05-09 18:36 ` Eric Biggers
2024-04-30 3:29 ` [PATCH 19/26] xfs: don't bother storing merkle tree blocks for zeroed data blocks Darrick J. Wong
2024-05-01 6:47 ` Christoph Hellwig
2024-05-01 22:47 ` Darrick J. Wong
2024-05-02 0:01 ` Eric Biggers
2024-05-08 20:26 ` Darrick J. Wong
2024-04-30 3:29 ` [PATCH 20/26] xfs: add fs-verity ioctls Darrick J. Wong
2024-04-30 3:29 ` [PATCH 21/26] xfs: advertise fs-verity being available on filesystem Darrick J. Wong
2024-04-30 3:29 ` [PATCH 22/26] xfs: check and repair the verity inode flag state Darrick J. Wong
2024-04-30 3:30 ` [PATCH 23/26] xfs: teach online repair to evaluate fsverity xattrs Darrick J. Wong
2024-04-30 3:30 ` [PATCH 24/26] xfs: report verity failures through the health system Darrick J. Wong
2024-04-30 3:30 ` [PATCH 25/26] xfs: make it possible to disable fsverity Darrick J. Wong
2024-05-01 6:48 ` Christoph Hellwig
2024-05-01 22:50 ` Darrick J. Wong
2024-05-02 0:15 ` Eric Biggers
2024-05-08 20:31 ` Darrick J. Wong
2024-05-09 5:04 ` Christoph Hellwig
2024-05-09 14:45 ` Darrick J. Wong
2024-05-09 15:06 ` Christoph Hellwig
2024-05-09 15:09 ` Darrick J. Wong
2024-05-09 15:13 ` Christoph Hellwig
2024-05-09 15:43 ` Darrick J. Wong
2024-05-17 19:36 ` Theodore Ts'o
2024-04-30 3:30 ` [PATCH 26/26] xfs: enable ro-compat fs-verity flag Darrick J. Wong
2024-04-30 3:19 ` [PATCHSET v5.6] xfsprogs: fs-verity support for XFS Darrick J. Wong
2024-04-30 3:31 ` [PATCH 01/38] fs: add FS_XFLAG_VERITY for verity files Darrick J. Wong
2024-04-30 3:31 ` [PATCH 02/38] xfs: use unsigned ints for non-negative quantities in xfs_attr_remote.c Darrick J. Wong
2024-04-30 3:31 ` [PATCH 03/38] xfs: turn XFS_ATTR3_RMT_BUF_SPACE into a function Darrick J. Wong
2024-04-30 3:31 ` [PATCH 04/38] xfs: create a helper to compute the blockcount of a max sized remote value Darrick J. Wong
2024-04-30 3:32 ` [PATCH 05/38] xfs: minor cleanups of xfs_attr3_rmt_blocks Darrick J. Wong
2024-04-30 3:32 ` [PATCH 06/38] xfs: use an empty transaction to protect xfs_attr_get from deadlocks Darrick J. Wong
2024-04-30 3:32 ` [PATCH 07/38] xfs: add attribute type for fs-verity Darrick J. Wong
2024-04-30 3:32 ` [PATCH 08/38] xfs: do not use xfs_attr3_rmt_hdr for remote verity value blocks Darrick J. Wong
2024-04-30 3:33 ` [PATCH 09/38] xfs: add fs-verity ro-compat flag Darrick J. Wong
2024-04-30 3:33 ` [PATCH 10/38] xfs: add inode on-disk VERITY flag Darrick J. Wong
2024-04-30 3:33 ` [PATCH 11/38] xfs: add fs-verity support Darrick J. Wong
2024-04-30 3:34 ` [PATCH 12/38] xfs: use merkle tree offset as attr hash Darrick J. Wong
2024-04-30 3:34 ` [PATCH 13/38] xfs: advertise fs-verity being available on filesystem Darrick J. Wong
2024-04-30 3:34 ` [PATCH 14/38] xfs: report verity failures through the health system Darrick J. Wong
2024-04-30 3:34 ` [PATCH 15/38] xfs: enable ro-compat fs-verity flag Darrick J. Wong
2024-04-30 3:35 ` [PATCH 16/38] libfrog: add fsverity to xfs_report_geom output Darrick J. Wong
2024-04-30 3:35 ` [PATCH 17/38] xfs_db: introduce attr_modify command Darrick J. Wong
2024-04-30 3:35 ` [PATCH 18/38] xfs_db: add ATTR_PARENT support to " Darrick J. Wong
2024-04-30 3:35 ` [PATCH 19/38] xfs_db: make attr_set/remove/modify be able to handle fs-verity attrs Darrick J. Wong
2024-04-30 3:36 ` [PATCH 20/38] man: document attr_modify command Darrick J. Wong
2024-04-30 3:36 ` [PATCH 21/38] xfs_db: create hex string as a field type Darrick J. Wong
2024-04-30 3:36 ` [PATCH 22/38] xfs_db: dump verity features and metadata Darrick J. Wong
2024-04-30 3:36 ` [PATCH 23/38] xfs_db: dump merkle tree data Darrick J. Wong
2024-04-30 3:37 ` [PATCH 24/38] xfs_db: dump the verity descriptor Darrick J. Wong
2024-04-30 3:37 ` [PATCH 25/38] xfs_db: don't obfuscate verity xattrs Darrick J. Wong
2024-04-30 3:37 ` [PATCH 26/38] xfs_db: dump the inode verity flag Darrick J. Wong
2024-04-30 3:37 ` [PATCH 27/38] xfs_db: compute hashes of merkle tree blocks Darrick J. Wong
2024-04-30 3:38 ` [PATCH 28/38] xfs_repair: junk fsverity xattrs when unnecessary Darrick J. Wong
2024-04-30 3:38 ` [PATCH 29/38] xfs_repair: clear verity iflag when verity isn't supported Darrick J. Wong
2024-04-30 3:38 ` [PATCH 30/38] xfs_repair: handle verity remote attrs Darrick J. Wong
2024-04-30 3:38 ` [PATCH 31/38] xfs_repair: allow upgrading filesystems with verity Darrick J. Wong
2024-04-30 3:39 ` [PATCH 32/38] xfs_scrub: check verity file metadata Darrick J. Wong
2024-04-30 3:39 ` [PATCH 33/38] xfs_scrub: validate verity file contents when doing a media scan Darrick J. Wong
2024-04-30 3:39 ` [PATCH 34/38] xfs_scrub: use MADV_POPULATE_READ to check verity files Darrick J. Wong
2024-04-30 3:40 ` [PATCH 35/38] xfs_spaceman: report data corruption Darrick J. Wong
2024-04-30 3:40 ` [PATCH 36/38] xfs_io: report fsverity status via statx Darrick J. Wong
2024-04-30 3:40 ` [PATCH 37/38] xfs_io: create magic command to disable verity Darrick J. Wong
2024-04-30 3:40 ` [PATCH 38/38] mkfs.xfs: add verity parameter Darrick J. Wong
2024-04-30 3:19 ` [PATCHSET v5.6] fstests: fs-verity support for XFS Darrick J. Wong
2024-04-30 3:41 ` [PATCH 1/6] common/verity: enable fsverity " Darrick J. Wong
2024-04-30 12:39 ` Andrey Albershteyn
2024-04-30 15:35 ` Darrick J. Wong
2024-04-30 3:41 ` [PATCH 2/6] xfs/{021,122}: adapt to fsverity xattrs Darrick J. Wong
2024-04-30 12:46 ` Andrey Albershteyn
2024-04-30 15:36 ` Darrick J. Wong
2024-04-30 3:41 ` [PATCH 3/6] xfs/122: adapt to fsverity Darrick J. Wong
2024-04-30 12:45 ` Andrey Albershteyn
2024-04-30 15:37 ` Darrick J. Wong
2024-04-30 3:41 ` [PATCH 4/6] xfs: test xfs_scrub detection and correction of corrupt fsverity metadata Darrick J. Wong
2024-04-30 12:29 ` Andrey Albershteyn
2024-04-30 15:43 ` Darrick J. Wong
2024-04-30 3:42 ` [PATCH 5/6] xfs: test disabling fsverity Darrick J. Wong
2024-04-30 12:56 ` Andrey Albershteyn
2024-04-30 13:11 ` Andrey Albershteyn
2024-04-30 15:48 ` Darrick J. Wong
2024-04-30 18:06 ` Andrey Albershteyn
2024-04-30 3:42 ` [PATCH 6/6] common/populate: add verity files to populate xfs images Darrick J. Wong
2024-04-30 13:22 ` Andrey Albershteyn
2024-04-30 15:49 ` Darrick J. Wong
2024-05-11 5:01 ` [PATCHSET v5.6] fstests: fs-verity support for XFS Zorro Lang
2024-05-17 15:56 ` Darrick J. Wong
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