linux-kernel - Re: [PATCH] gcc-plugins: disable under COMPILE

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Date:	Mon, 13 Jun 2016 13:11:37 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"Austin S. Hemmelgarn" <ahferroin7@...il.com>
Cc:	Emese Revfy <re.emese@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Michal Marek <mmarek@...e.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Linux-Next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH] gcc-plugins: disable under COMPILE_TEST

On Mon, Jun 13, 2016 at 11:32 AM, Austin S. Hemmelgarn
<ahferroin7@...il.com> wrote:
> On 2016-06-12 20:18, Emese Revfy wrote:
>>
>> On Sun, 12 Jun 2016 15:25:39 -0700
>> Kees Cook <keescook@...omium.org> wrote:
>>
>>> I don't like this because it means if someone specifically selects
>>> some plugins in their .config, and the headers are missing, the kernel
>>> will successfully compile. For many plugins, this results in a kernel
>>> that lacks the requested security features, and that I really do not
>>> want to have happening. I'm okay leaving these disabled for compile
>>> tests for now. We can revisit this once more distros have plugins
>>> enabled by default.
>>
>>
>> You are right. Your patch is safer.
>>
> Why not make it so that if COMPILE_TEST is enabled, the build warns if it
> can't find the headers, otherwise it fails?  That way, people who are doing
> all*config builds but don't have the headers will still get some build
> coverage, and the people who are enabling it as a security feature will
> still get build failures.

I don't see a clear way to do this, but if you can find a way to make
that happen, please send a patch! :)

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security