linux-kernel - Re: [PATCH v4 ipsec-next] xfrm: remove VLA usage in __xfrm6

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Message-ID: <20180426083306.uwhew63btnoalbxw@gauss3.secunet.de>
Date:   Thu, 26 Apr 2018 10:33:06 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Stefano Brivio <sbrivio@...hat.com>
CC:     Kees Cook <keescook@...omium.org>,
        Andreas Christoforou <andreaschristofo@...il.com>,
        <kernel-hardening@...ts.openwall.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 ipsec-next] xfrm: remove VLA usage in __xfrm6_sort()

On Wed, Apr 25, 2018 at 04:58:52PM +0200, Stefano Brivio wrote:
> On Wed, 25 Apr 2018 07:46:39 -0700
> Kees Cook <keescook@...omium.org> wrote:
> 
> > In the quest to remove all stack VLA usage removed from the kernel[1],
> > just use XFRM_MAX_DEPTH as already done for the "class" array. In one
> > case, it'll do this loop up to 5, the other caller up to 6.
> > 
> > [1] https://lkml.org/lkml/2018/3/7/621
> > 
> > Co-developed-by: Andreas Christoforou <andreaschristofo@...il.com>
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> > v4:
> > - actually remove memset(). :)
> > v3:
> > - adjust Subject and commit log (Steffen)
> > - use "= { }" instead of memset() (Stefano)
> > v2:
> > - use XFRM_MAX_DEPTH for "count" array (Steffen and Mathias).
> > ---
> 
> Acked-by: Stefano Brivio <sbrivio@...hat.com>

Applied to ipsec-next, thanks everyone!