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

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Message-ID: <53C48986.5010109@oracle.com>
Date:	Tue, 15 Jul 2014 11:53:10 +1000
From:	James Morris <james.l.morris@...cle.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Oleg Nesterov <oleg@...hat.com>,
	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 07/15/2014 04:59 AM, Kees Cook wrote:
> Hi James,
>
> Is this series something you would carry in the security-next tree?
> That has traditionally been where seccomp features have landed in the
> past.
>
> -Kees
>
>
> 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/
>>
>> -Kees
>>
>>>
>>> Reviewed-by: Oleg Nesterov <oleg@...hat.com>
>>>
>>
>>
>>
>> --
>> Kees Cook
>> Chrome OS Security
>
>
>

Yep, certainly.

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