| Date | Fri, 24 Nov 2017 14:46:14 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH 14/43] x86/entry/64: Return to userspace from the trampoline stack |
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On Fri, 24 Nov 2017, Ingo Molnar wrote:
> From: Andy Lutomirski <luto@kernel.org> > > By itself, this is useless. It gives us the ability to run some final > code before exit that cannnot run on the kernel stack. This could > include a CR3 switch a la KAISER or some kernel stack erasing, for > example. (Or even weird things like *changing* which kernel stack > gets used as an ASLR-strengthening mechanism.) > > The SYSRET32 path is not covered yet. It could be in the future or > we could just ignore it and force the slow path if needed. > > Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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