From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: viro@zeniv.linux.org.uk, darrick.wong@oracle.com, tytso@mit.edu,
adilger.kernel@dilger.ca, clm@fb.com, jbacik@fb.com,
dsterba@suse.com
Cc: sandeen@sandeen.net, dhowells@redhat.com, fliu@suse.com,
jack@suse.cz, jeffm@suse.com, nborisov@suse.com,
jake.norris@suse.com, mtk.manpages@gmail.com,
linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: [RFC v2 4/4] btrfs: verify symlinks with append/immutable flags
Date: Thu, 10 May 2018 16:13:59 -0700 [thread overview]
Message-ID: <20180510231359.16899-5-mcgrof@kernel.org> (raw)
In-Reply-To: <20180510231359.16899-1-mcgrof@kernel.org>
The Linux VFS does not allow a way to set append/immuttable
attributes to symlinks, this is just not possible. If this is
detected inform the user as the filesystem must be corrupted.
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
fs/btrfs/inode.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c4bdb597b323..d9c786be408c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3933,6 +3933,15 @@ static int btrfs_read_locked_inode(struct inode *inode)
inode->i_op = &btrfs_dir_inode_operations;
break;
case S_IFLNK:
+ /* VFS does not allow setting these so must be corruption */
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
+ ret = -EUCLEAN;
+ btrfs_crit(fs_info,
+ "corrupt symlink with append/immutable ino=%llu root=%llu\n",
+ btrfs_ino(BTRFS_I(inode)),
+ root->root_key.objectid);
+ goto make_bad;
+ }
inode->i_op = &btrfs_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &btrfs_symlink_aops;
--
2.17.0
next prev parent reply other threads:[~2018-05-10 23:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-10 23:13 [RFC v2 0/4] vfs: detect symlink corruption with attributes Luis R. Rodriguez
2018-05-10 23:13 ` [RFC v2 1/4] vfs: skip extra attributes check on removal for symlinks Luis R. Rodriguez
2018-05-10 23:13 ` [RFC v2 2/4] xfs: add verifier check for symlink with append/immutable flags Luis R. Rodriguez
2018-05-11 2:20 ` Darrick J. Wong
2018-05-10 23:13 ` [RFC v2 3/4] ext4: " Luis R. Rodriguez
2018-05-11 21:12 ` Jan Kara
2018-05-13 20:51 ` Theodore Y. Ts'o
2018-05-10 23:13 ` Luis R. Rodriguez [this message]
2018-05-11 14:04 ` [RFC v2 4/4] btrfs: verify symlinks " David Sterba
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