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From: Mark Rutland <mark.rutland@arm.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org, amit.kachhap@arm.com,
	broonie@kernel.org, catalin.marinas@arm.com, will@kernel.org
Subject: Re: [PATCH 2/2] arm64: pauth: don't sign leaf functions
Date: Thu, 26 Jan 2023 11:00:48 +0000	[thread overview]
Message-ID: <Y9JdYJFzyf1cQDZA@FVFF77S0Q05N> (raw)
In-Reply-To: <CAMj1kXEOeBDz7TidkrKo+PXg_74PjdAQPmJCq=u92yhTYO4P=Q@mail.gmail.com>

On Thu, Jan 26, 2023 at 09:40:33AM +0100, Ard Biesheuvel wrote:
> On Wed, 25 Jan 2023 at 19:22, Mark Rutland <mark.rutland@arm.com> wrote:
> > We've used pointer authentication in leave functions since the
> 
> leaf

Thanks; fixed locally.

[...]

> > So generally, trying to use AUTIASP to detect such gadgetization is not
> > robust, and this is dealt with far better by forward-edge CFI (which is
> > designed to prevent such cases). We should bite the buller and stop
> 
> bullet

Thanks; fixed locally.

> > pretending that AUTIASP is a mitigation for such forward-edge
> > gadgetisation.
> >
> 
> Nit: this has an 's' whereas the previous occurrence had a 'z'

Thanks; I've made those both use 'z'.

[...]

> > Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> > Cc: Amit Daniel Kachhap <amit.kachhap@arm.com>
> > Cc: Ard Biesheuvel <ardb@kernel.org>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Mark Brown <broonie@kernel.org>
> > Cc: Will Deacon <will@kernel.org>
> 
> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

Thanks!

Mark.

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  reply	other threads:[~2023-01-26 11:01 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-25 18:21 [PATCH 0/2] arm64: pointer auth cleanup Mark Rutland
2023-01-25 18:22 ` [PATCH 1/2] arm64: unify asm-arch manipulation Mark Rutland
2023-01-26  8:31   ` Ard Biesheuvel
2023-01-30 18:31   ` Mark Brown
2023-01-25 18:22 ` [PATCH 2/2] arm64: pauth: don't sign leaf functions Mark Rutland
2023-01-26  8:40   ` Ard Biesheuvel
2023-01-26 11:00     ` Mark Rutland [this message]
2023-01-30 18:33   ` Mark Brown

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