linux-kernel - Re: [PATCH] net: inetfilter: LLVMLinux: vlais-netfilter

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Date:	Fri, 7 Mar 2014 18:26:27 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	behanw@...verseincode.com
Cc:	davem@...emloft.net, kaber@...sh.net, kadlec@...ckhole.kfki.hu,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	dwmw2@...radead.org, pageexec@...email.hu,
	Mark Charlebois <charlebm@...il.com>,
	Vinícius Tinti <viniciustinti@...il.com>
Subject: Re: [PATCH] net: inetfilter: LLVMLinux: vlais-netfilter

On Thu, Mar 06, 2014 at 11:56:08AM -0800, behanw@...verseincode.com wrote:
> From: Mark Charlebois <charlebm@...il.com>
> 
> Replaced non-standard C use of Variable Length Arrays In Structs (VLAIS) in
> xt_repldata.h with a C99 compliant flexible array member and then calculated
> offsets to the other struct members. These other members aren't referenced by
> name in this code, however this patch maintains the same memory layout and
> padding as was previously accomplished using VLAIS.
> 
> Had the original structure been ordered differently, with the entries VLA at
> the end, then it could have been a flexible member, and this patch would have
> been a lot simpler. However since the data stored in this structure is
> ultimately exported to userspace, the order of this structure can't be changed.
> 
> This patch makes no attempt to change the existing behavior, merely the way in
> which the current layout is accomplished using standard C99 constructs. As such
> the code can now be compiled with either gcc or clang.

I think we already agreed on not accepting macro tricks to get this
compiling with clang:

http://comments.gmane.org/gmane.comp.security.firewalls.netfilter.devel/45138
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