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Date:	Mon, 14 Jul 2014 12:04:33 -0700
From:	Andy Lutomirski <>
To:	Kees Cook <>
Cc:	Oleg Nesterov <>,
	LKML <>,
	Alexei Starovoitov <>,
	"Michael Kerrisk (man-pages)" <>,
	Andrew Morton <>,
	Daniel Borkmann <>,
	Will Drewry <>,
	Julien Tinnes <>,
	David Drysdale <>,
	Linux API <>,
	"" <>,
	linux-arch <>,
	linux-security-module <>
Subject: Re: [PATCH v10 0/11] seccomp: add thread sync ability

On Fri, Jul 11, 2014 at 10:55 AM, Kees Cook <> wrote:
> On Fri, Jul 11, 2014 at 9:49 AM, Oleg Nesterov <> 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.

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