linux-kernel - Re: [PATCH] xfs: Initialize label array properly

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Date:   Fri, 30 Aug 2019 17:31:54 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Austin Kim <austindh.kim@...il.com>
Cc:     darrick.wong@...cle.com, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: Initialize label array properly

On Fri, Aug 30, 2019 at 02:37:07PM +0900, Austin Kim wrote:
> In case kernel stack variable is not initialized properly,
> there is a risk of kernel information disclosure.
> 
> So, initialize 'char label[]' array with null characters.

Can you describe the information disclosure vector here? I can't see
any, mostly because this is the "set label" function and that
doesn't return anything to userspace.

We also zero the on-disk label before we copy the user label into
it, so I don't see that anything can leak onto disk, either...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com