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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 2/4] xfs: add verifier check for symlink with append/immutable flags
Date: Thu, 10 May 2018 16:13:57 -0700	[thread overview]
Message-ID: <20180510231359.16899-3-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 we can
correct this with xfs_repair, so inform the user.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 fs/xfs/libxfs/xfs_symlink_remote.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c
index 5ef5f354587e..42dd81ede3d6 100644
--- a/fs/xfs/libxfs/xfs_symlink_remote.c
+++ b/fs/xfs/libxfs/xfs_symlink_remote.c
@@ -242,5 +242,10 @@ xfs_symlink_shortform_verify(
 	/* We /did/ null-terminate the buffer, right? */
 	if (*endp != 0)
 		return __this_address;
+
+	/* Immutable and append flags are not allowed on symlinks */
+	if (ip->i_d.di_flags & (XFS_DIFLAG_APPEND | XFS_DIFLAG_IMMUTABLE))
+		return __this_address;
+
 	return NULL;
 }
-- 
2.17.0


  parent reply	other threads:[~2018-05-10 23:15 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 ` Luis R. Rodriguez [this message]
2018-05-11  2:20   ` [RFC v2 2/4] xfs: add verifier check for symlink with append/immutable flags 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 ` [RFC v2 4/4] btrfs: verify symlinks " Luis R. Rodriguez
2018-05-11 14:04   ` David Sterba

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