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Published 20 hours ago • verified publisher icon GrapheneOS

use ShadowCallStack

Open thestinger opened this issue 6 years ago • 4 comments

thestinger avatar Feb 04 '19 15:02 thestinger

Interesting comments before closing upstream: https://bugs.chromium.org/p/chromium/issues/detail?id=505015

It was deprecated and removed, in the end.

csagan5 avatar May 12 '19 04:05 csagan5

I think they should have considered the impact of memory tagging (ARMv8.5 MTE). Android is adopting ShadowCallStack, although that's much simpler, and avoids the issues of leaks.

thestinger avatar May 12 '19 15:05 thestinger

We're going to be considering ShadowCallStack rather than SafeStack. SafeStack support for Android was abandoned and ShadowCallStack is what they're using for the kernel and substantial parts of userspace. ShadowCallStack is only available for arm64 since the x86 implementation was seriously flawed due to how returns work there.

thestinger avatar Jun 07 '20 23:06 thestinger