Re: [PATCH v10 0/11] seccomp: add thread sync ability
From: Oleg Nesterov
Date: Fri Jul 11 2014 - 12:52:31 EST
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,
Reviewed-by: Oleg Nesterov <oleg@xxxxxxxxxx>
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