linux-kernel - Re: [Security] [PATCH v4] drivers/net/tulip/de4x5.c: fix union member name in DE4X5_GET

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Message-ID: <20100917063754.GB2341@1wt.eu>
Date:	Fri, 17 Sep 2010 08:37:54 +0200
From:	Willy Tarreau <w@....eu>
To:	David Miller <davem@...emloft.net>
Cc:	security@...nel.org, grundler@...isc-linux.org,
	netdev@...r.kernel.org, drosenberg@...curity.com, jeffm@...e.com,
	linux-kernel@...r.kernel.org, kyle@...artin.ca
Subject: Re: [Security] [PATCH v4] drivers/net/tulip/de4x5.c: fix union member name in DE4X5_GET_REG ioctl

On Fri, Sep 17, 2010 at 08:36:02AM +0200, Willy Tarreau wrote:
> On Thu, Sep 16, 2010 at 10:34:41PM -0700, David Miller wrote:
> > From: Dan Rosenberg <drosenberg@...curity.com>
> > Date: Fri, 17 Sep 2010 01:30:36 -0400
> > 
> > > Tiring doesn't begin to describe it.  Formatting undamaged.
> > 
> > :-)  Thanks.
> > 
> > > This was previously reported as a security issue due to leakage of
> > > uninitialized stack memory.  Jeff Mahoney pointed out that this is
> > > incorrect since the copied data is from a union (rather than a struct).
> > > Therefore, this patch is only under consideration for the sake of
> > > correctness, and is not security relevant. 
> > > 
> > > Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
> > > Acked-by: Grant Grundler <grundler@...isc-linux.org>
> > 
> > Applied.
> 
> David, just for the record, as was already reported on the list, this
> fix is finally more a cleanup than a security fix because "tmp" is a
> union and not a struct, so tmp.addr == tmp.lval.

sorry, that was already explained in the commit message, next time
I'll read it fully before replying :-(

Willy

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