linux-hardening - Re: (subset) [PATCH v3 1/2] AARCH64: Add gcc Shadow Call Stack support

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Date:   Thu, 10 Mar 2022 10:15:37 -0800
From:   Kees Cook <keescook@...omium.org>
To:     luc.vanoostenryck@...il.com, nathan@...nel.org, shuah@...nel.org,
        mark.rutland@....com, akpm@...ux-foundation.org,
        tglx@...utronix.de, ndesaulniers@...gle.com, linux@...ck-us.net,
        gregkh@...uxfoundation.org, catalin.marinas@....com,
        will@...nel.org, npiggin@...il.com, arnd@...db.de,
        masahiroy@...nel.org, ojeda@...nel.org,
        Dan Li <ashimida@...ux.alibaba.com>, elver@...gle.com,
        samitolvanen@...gle.com
Cc:     Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kselftest@...r.kernel.org
Subject: Re: (subset) [PATCH v3 1/2] AARCH64: Add gcc Shadow Call Stack support

On Wed, 2 Mar 2022 23:43:23 -0800, Dan Li wrote:
> Shadow call stacks will be available in GCC >= 12, this patch makes
> the corresponding kernel configuration available when compiling
> the kernel with the gcc.
> 
> Note that the implementation in GCC is slightly different from Clang.
> With SCS enabled, functions will only pop x30 once in the epilogue,
> like:
> 
> [...]

I'm taking this one now so it'll make the merge window. We can hammer
out the lkdtm test after that.

Applied to for-next/hardening, thanks!

[1/2] arm64: Add gcc Shadow Call Stack support
      https://git.kernel.org/kees/c/afcf5441b9ff

-- 
Kees Cook