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

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Message-ID: <CAGXu5j+uDDeU0aYzD-4EqaBYyZUMR1bVS=Dqx+byYpR4NPkvhQ@mail.gmail.com>
Date:	Mon, 13 Jun 2016 13:15:40 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	Michal Marek <mmarek@...e.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Emese Revfy <re.emese@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	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 1:40 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Sat, Jun 11, 2016 at 6:12 PM, Kees Cook <keescook@...omium.org> wrote:
>> Since adding the gcc plugin development headers is required for the
>> gcc plugin support, we should ease into this new kernel build dependency
>> more slowly. For now, disable the gcc plugins under COMPILE_TEST so that
>> all*config builds will skip it.
>>
>
> [ This might be a bit off-topic - Feel free to answer ]
>
> Hi,
>
> I want to try that new "GCC-plugin" feature.
> Do you have a Git repo for "easy-testing"?

Start with linux-next. It has the basic infrastructure. The
"latent_entropy" plugin is in my kssp tree here:
http://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=kspp/gcc-plugins/latent_entropy
though it is not the most up to date version.

> Does the kernel's build-system check for installed "gcc-plugin
> development headers"?

Yes, when the plugins have been selected.

> Which GCC versions support "gcc-plugin" feature?

gcc-4.5 and newer.

> I am here on Ubuntu/precise AMD64 and have gcc-4.6.4 and gcc-4.9.2.

I strongly recommend upgrading to Ubuntu 16.04, but regardless, using
gcc 4.9 should be fine.

> [ Optional ]
> What about the topic and support for "LLVM/Clang and hardening" of the
> Linux-kernel?

I haven't been involved in that project, sorry.

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security