linux-kernel - Re: [PATCH v6] kernel: add kcov code coverage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160125153806.GA12391@node.shutemov.name>
Date:	Mon, 25 Jan 2016 17:38:07 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	syzkaller <syzkaller@...glegroups.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Tavis Ormandy <taviso@...gle.com>,
	Will Deacon <will.deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Quentin Casasnovas <quentin.casasnovas@...cle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Kees Cook <keescook@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Drysdale <drysdale@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...el.com>
Subject: Re: [PATCH v6] kernel: add kcov code coverage

On Mon, Jan 25, 2016 at 02:03:55PM +0100, Dmitry Vyukov wrote:
> On Mon, Jan 25, 2016 at 2:00 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > kcov provides code coverage collection for coverage-guided fuzzing
> > (randomized testing). Coverage-guided fuzzing is a testing technique
> > that uses coverage feedback to determine new interesting inputs to a
> > system. A notable user-space example is AFL
> > (http://lcamtuf.coredump.cx/afl/). However, this technique is not
> > widely used for kernel testing due to missing compiler and kernel
> > support.
> 
> Kirill, I export kcov file as 0600 now.
> 
> Any more comments?

Acked-by: Kirill A. Shutemov <kirill@...temov.name>

I have some doubts if debugfs knob is the right way to go. Maybe it would
be better to integrate the feature with perf somehow as it has tracing
capabilities.

But that's just a side note. I don't have a strong opinion about the
interface.

+CC perf people.

-- 
 Kirill A. Shutemov