From: Kees Cook <keescook@chromium.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, will@kernel.org,
mark.rutland@arm.com, catalin.marinas@arm.com, maz@kernel.org,
Sami Tolvanen <samitolvanen@google.com>,
Fangrui Song <maskray@google.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Dan Li <ashimida@linux.alibaba.com>
Subject: Re: [RFC PATCH v2 2/3] scs: add support for dynamic shadow call stacks
Date: Thu, 5 May 2022 17:00:36 -0700 [thread overview]
Message-ID: <202205051700.FC0EC12F2A@keescook> (raw)
In-Reply-To: <20220505161011.1801596-3-ardb@kernel.org>
On Thu, May 05, 2022 at 06:10:10PM +0200, Ard Biesheuvel wrote:
> In order to allow arches to use code patching to conditionally emit the
> shadow stack pushes and pops, rather than always taking the performance
> hit even on CPUs that implement alternatives such as stack pointer
> authentication on arm64, add a Kconfig symbol that can be set by the
> arch to omit the SCS codegen itself, without otherwise affecting how
> support code for SCS and compiler options (for register reservation, for
> instance) are emitted.
>
> Also, add a static key and some plumbing to omit the allocation of
> shadow call stack for dynamic SCS configurations if SCS is disabled at
> runtime.
>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
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next prev parent reply other threads:[~2022-05-06 0:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-05 16:10 [RFC PATCH v2 0/3] arm64: dynamic shadow call stack support Ard Biesheuvel
2022-05-05 16:10 ` [RFC PATCH v2 1/3] arm64: unwind: add asynchronous unwind tables to kernel and modules Ard Biesheuvel
2022-05-05 20:19 ` Nick Desaulniers
2022-05-06 7:07 ` Ard Biesheuvel
2022-05-05 16:10 ` [RFC PATCH v2 2/3] scs: add support for dynamic shadow call stacks Ard Biesheuvel
2022-05-05 21:14 ` Nick Desaulniers
2022-05-06 0:00 ` Kees Cook [this message]
2022-05-05 16:10 ` [RFC PATCH v2 3/3] arm64: implement dynamic shadow call stack for Clang Ard Biesheuvel
2022-05-05 21:01 ` Nick Desaulniers
2022-05-18 1:53 ` Sami Tolvanen
2022-05-06 0:00 ` Kees Cook
2022-05-06 6:59 ` Ard Biesheuvel
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