Re: [PATCH v15 05/26] x86/cet/shstk: Add Kconfig option for user-mode Shadow Stack

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On 11/30/2020 11:56 AM, Nick Desaulniers wrote:
In response to https://lore.kernel.org/lkml/20201110162211.9207-6-yu-cheng.yu@xxxxxxxxx/.

Hi Yu-cheng,
This feature reminds me very much of
ARCH_SUPPORTS_SHADOW_CALL_STACK/CC_HAVE_SHADOW_CALL_STACK implemented in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5287569a790d2546a06db07e391bf84b8bd6cf51.

Do you think it would be worthwhile to share the same config name between x86
and aarch64?

The CET series has ARCH_HAS_SHADOW_STACK. In response to Boris' earlier comment, I think this maybe eliminated. In case it is still needed, I think it is better to have different names (but I am open to changing it).


(Though, it seems on x86 there will be a distinction between kernel mode and
user mode configs, if I understand correctly?)


Yes, on x86, kernel and user-mode can be enabled separately.

Yu-cheng



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