Messages in this thread | | | Date | Wed, 5 Sep 2018 20:35:19 +0200 (CEST) | From | Jiri Kosina <> | Subject | Re: [PATCH v3 1/3] ptrace: Provide ___ptrace_may_access() that can be applied on arbitrary tasks |
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On Wed, 5 Sep 2018, Andi Kleen wrote:
> Please if you repost include plenty of performance numbers for multi > threaded workloads. It's ridiculous to even discuss this without them.
Talking about ridiculous ... I find it a bit sad that Intel has let this be unfixed for 3/4 years in linux; that doesn't really signal deep dedication to customer safety. Have any STIBP patches been even submitted?
This is not the same situation as IBRS which was mostly ignored -- there we have retpolines to protect the kernel, and it's debatable whether it's exploitable on SKL at all.
Ignoring IBPB and STIBP is keeping the system plain vulnerable to user-user attacks, and us not providing users with possibiliy to easily mitigate, is a bit embarassing in my eyes.
Thanks,
-- Jiri Kosina SUSE Labs
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