linux-kernel - Re: [PATCH v3 0/2] scs: switch to vmapped shadow stacks

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Message-Id: <160681862873.1496993.150824561732453035.b4-ty@kernel.org>
Date:   Tue,  1 Dec 2020 11:40:49 +0000
From:   Will Deacon <will@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Sami Tolvanen <samitolvanen@...gle.com>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3 0/2] scs: switch to vmapped shadow stacks

On Mon, 30 Nov 2020 15:34:40 -0800, Sami Tolvanen wrote:
> As discussed a few months ago [1][2], virtually mapped shadow call stacks
> are better for safety and robustness. This series dusts off the VMAP
> option from the original SCS patch series and switches the kernel to use
> virtually mapped shadow stacks unconditionally when SCS is enabled.
> 
>  [1] https://lore.kernel.org/lkml/20200515172355.GD23334@willie-the-truck/
>  [2] https://lore.kernel.org/lkml/20200427220942.GB80713@google.com/
> 
> [...]

Applied to arm64 (for-next/scs), thanks!

[1/2] scs: switch to vmapped shadow stacks
      https://git.kernel.org/arm64/c/a2abe7cbd8fe
[2/2] arm64: scs: use vmapped IRQ and SDEI shadow stacks
      https://git.kernel.org/arm64/c/ac20ffbb0279

I also threw a patch on top implementing the suggestion I made on v2, so
please take a look if you get a chance.

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev