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SubjectRe: [PATCH 14/43] x86/entry/64: Return to userspace from the trampoline stack
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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