| Subject | Re: [PATCH 00/11 v3] x86: load FPU registers on return to userland | From | Rik van Riel <> | Date | Thu, 04 Oct 2018 12:45:08 -0400 |
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On Thu, 2018-10-04 at 16:05 +0200, Sebastian Andrzej Siewior wrote:
> In v3 I dropped that decouple idea. I also learned that the wrpkru > instruction is not privileged and so caching it in kernel does not > work.
Wait, so any thread can bypass its memory protection keys, even if there is a seccomp filter preventing it from calling the PKRU syscalls?
Is that intended?
Is that simply a hardware limitation, or something where we can set a flag somewhere to force tasks to go through the kernel?
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