linux-kernel - Re: [PATCH v10 0/11] seccomp: add thread sync ability

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Message-ID: <CAGXu5j+A0GodNCnjqpYQXC2HL+S08_yP5H_n_v51VpE4UnnK7A@mail.gmail.com>
Date:	Mon, 14 Jul 2014 13:34:36 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Will Drewry <wad@...omium.org>,
	Julien Tinnes <jln@...omium.org>,
	David Drysdale <drysdale@...gle.com>,
	Linux API <linux-api@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-mips@...ux-mips.org,
	linux-arch <linux-arch@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v10 0/11] seccomp: add thread sync ability

On Mon, Jul 14, 2014 at 12:04 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Fri, Jul 11, 2014 at 10:55 AM, Kees Cook <keescook@...omium.org> wrote:
>> On Fri, Jul 11, 2014 at 9:49 AM, Oleg Nesterov <oleg@...hat.com> wrote:
>>> On 07/10, Kees Cook wrote:
>>>>
>>>> This adds the ability for threads to request seccomp filter
>>>> synchronization across their thread group (at filter attach time).
>>>> For example, for Chrome to make sure graphic driver threads are fully
>>>> confined after seccomp filters have been attached.
>>>>
>>>> To support this, locking on seccomp changes via thread-group-shared
>>>> sighand lock is introduced, along with refactoring of no_new_privs. Races
>>>> with thread creation are handled via delayed duplication of the seccomp
>>>> task struct field and cred_guard_mutex.
>>>>
>>>> This includes a new syscall (instead of adding a new prctl option),
>>>> as suggested by Andy Lutomirski and Michael Kerrisk.
>>>
>>> I do not not see any problems in this version,
>>
>> Awesome! Thank you for all the reviews. :) If Andy and Michael are
>> happy with this too, I think this is in good shape. \o/
>
> I think I'm happy with it.  Is it in git somewhere for easy perusal?
> I have a cold, so my reviewing ability is a bit off, but I want to
> take a look at the final version, and git is a little easier than
> email for this.

Yes, absolutely:
https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=seccomp-tsync

Thanks for looking it over, and I hope you feel better soon!

-Kees

-- 
Kees Cook
Chrome OS Security
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