linux-kernel - Re: [PATCH v2 1/1] xattr: Allow user.* xattr on symlink and special files

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Date:   Mon, 12 Jul 2021 13:50:32 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk, virtio-fs@...hat.com, dwalsh@...hat.com,
        dgilbert@...hat.com, casey.schaufler@...el.com,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        miklos@...redi.hu, gscrivan@...hat.com, jack@...e.cz,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v2 1/1] xattr: Allow user.* xattr on symlink and special
 files

On Fri, Jul 09, 2021 at 04:36:33PM -0400, Theodore Ts'o wrote:
> On Fri, Jul 09, 2021 at 08:34:41AM -0700, Casey Schaufler wrote:
> > >> One question, do all filesystem supporting xattrs deal with setting them
> > >> on symlinks/device files correctly?
> > > Wrote a simple bash script to do setfattr/getfattr user.foo xattr on
> > > symlink and device node on ext4, xfs and btrfs and it works fine.
> > 
> > How about nfs, tmpfs, overlayfs and/or some of the other less conventional
> > filesystems?
> 
> As a suggestion, perhaps you could take your bash script and turn it
> into an xfstests test so we can more easily test various file systems,
> both now and once the commit is accepted, to look for regressions?

Sounds good. I see there is already an xattr test (generic/062) which
is broken after my patch. Current test expects that user.* xattrs will
fail on symlink/special device.

I will probably have to query kernel version and modify test so that
expect failure before a certain version and success otherwise.

Thanks
Vivek