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

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Date:	Fri, 11 Jul 2014 10:55:33 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	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 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/

-Kees

>
> Reviewed-by: Oleg Nesterov <oleg@...hat.com>
>



-- 
Kees Cook
Chrome OS Security
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