Re: [PATCH v2 0/3] seccomp: add PR_SECCOMP_EXT and SECCOMP_EXT_ACT_TSYNC

[Andy Lutomirski]

On Thu, Apr 17, 2014 at 11:05 AM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> This adds the ability for threads to request seccomp filter
> synchronization across their thread group. To support this,
> seccomp locking on writes is introduced, along with refactoring
> of no_new_privs. Races with thread creation are handled via the
> tasklist_list.
>
> I think all the concerns raised during the discussion[1] of the first
> version of this patch have been addressed. However, the races involved
> have tricked me before. :)
>

Would this be easier to use if there were a single syscall to set a
seccomp filter and sync threads?  That way you wouldn't have to write
your filter such that it gives permission to sync threads.

--Andy
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