Re: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack
From: Andy Lutomirski <luto@kernel.org>
Date: 2020-08-25 00:36:20
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On Mon, Aug 24, 2020 at 5:30 PM Yu-cheng Yu [off-list ref] wrote:
arch_prctl(ARCH_X86_CET_MMAP_SHSTK, u64 *args)
Allocate a new shadow stack.
The parameter 'args' is a pointer to a user buffer.
*args = desired size
*(args + 1) = MAP_32BIT or MAP_POPULATE
On returning, *args is the allocated shadow stack address.This is hideous. Would this be better as a new syscall? --Andy