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SubjectRe: [PATCH v10 0/11] seccomp: add thread sync ability
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/


> Reviewed-by: Oleg Nesterov <>

Kees Cook
Chrome OS Security

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