Messages in this thread | | | From | Kees Cook <> | Date | Fri, 8 Jun 2018 09:29:42 -0700 | Subject | Re: [PATCH v3 0/4] seccomp trap to userspace |
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On Thu, May 31, 2018 at 7:49 AM, Tycho Andersen <tycho@tycho.ws> wrote: > Hi all, > > Here's a v3 of the seccomp trap to userspace, with all the nits from v2 > fixed. Open questions from v2 are still: > > 1. is it ok not to use netlink?
Yeah, I think there isn't a sensible way to reuse that API, which is too bad. Let's just try to keep this interface future-proofed. :)
> 2. what should the fd passing API look like? (see patch notes on this > one for details of why the current one might (?) be a problem)
The only thing in my mind is avoiding the problems with other fd passing API (e.g. when do rlimits get checked, etc).
> As an added bonus, I've also written some stress testing, with lots of > tasks and listeners (1000 of each) sharing the same notification thread, > and not found any issues so far. Code is here: > https://github.com/tych0/kernel-utils/blob/master/seccomp/notify_stress.c > although I haven't included it in the patchset.
That's excellent, thanks!
> v2: https://lkml.org/lkml/2018/5/17/627 > > Tycho Andersen (4): > seccomp: add a return code to trap to userspace > seccomp: make get_nth_filter available outside of CHECKPOINT_RESTORE > seccomp: add a way to get a listener fd from ptrace > seccomp: add support for passing fds via USER_NOTIF
I'm under a time crunch with the merge window, but after -rc2 I should have time to give this some close review. FWIW, I expect this to enter -next this cycle and get it into the 4.19 merge window: we need the feature and the alternatives have been well explored and don't look workable.
Thanks for the series!
-Kees
-- Kees Cook Pixel Security
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