linux-ext4 - Re: [RFC v2 3/4] ext4: add verifier check for symlink with append/immutable flags

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Message-ID: <20180513205132.GG14763@thunk.org>
Date:   Sun, 13 May 2018 16:51:32 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>, viro@...iv.linux.org.uk,
        darrick.wong@...cle.com, adilger.kernel@...ger.ca, clm@...com,
        jbacik@...com, dsterba@...e.com, sandeen@...deen.net,
        dhowells@...hat.com, fliu@...e.com, jeffm@...e.com,
        nborisov@...e.com, jake.norris@...e.com, mtk.manpages@...il.com,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 3/4] ext4: add verifier check for symlink with
 append/immutable flags

On Fri, May 11, 2018 at 11:12:18PM +0200, Jan Kara wrote:
> On Thu 10-05-18 16:13:58, Luis R. Rodriguez wrote:
> > 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@...nel.org>
> 
> Looks good to me. You can add:
> 
> Reviewed-by: Jan Kara <jack@...e.cz>

Applied into the ext4 tree after verifying that e2fsck already handles
this case:

% e2fsck -fy /tmp/foo.img
e2fsck 1.44.1 (24-Mar-2018)
Pass 1: Checking inodes, blocks, and sizes
Special (device/socket/fifo/symlink) file (inode 13) has immutable
or append-only flag set.  Clear? yes

(The btrfs and xfs maintainers might want to make a similar check
before accepting their respective patches.)

						- Ted