linux-kernel - Re: [PATCH v5 5/5] Add sancov plugin

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Message-ID: <CACT4Y+axEAF=m+=15ymTzveY9uWOLQsBoDkzKY-K0XnTngKwOw@mail.gmail.com>
Date:	Tue, 8 Mar 2016 11:54:29 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Emese Revfy <re.emese@...il.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	PaX Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Michal Marek <mmarek@...e.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 5/5] Add sancov plugin

On Mon, Mar 7, 2016 at 10:07 PM, Kees Cook <keescook@...omium.org> wrote:
> On Sun, Mar 6, 2016 at 3:07 PM, Emese Revfy <re.emese@...il.com> wrote:
>> The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
>> at the start of basic blocks.
>>
>> This plugin is a helper plugin for the kcov feature. It supports
>> all gcc versions with plugin support (from gcc-4.5 on).
>> It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
>> (https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).
>
> Very cool! Dmitry, is this something you could put to good use?

I am using gcc with sancov as a regular pass, so I don't a good use
for this right now. Maybe it will help with deployment for Android. I
don't know. Though, it will require backporting this plugin support.