linux-kernel - Re: [PATCH stable 4.19] arm64: errata: Remove AES hwcap for COMPAT tasks

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Date:   Wed, 26 Oct 2022 18:49:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     stable@...r.kernel.org, James Morse <james.morse@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jonathan Corbet <corbet@....net>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Ionela Voinescu <ionela.voinescu@....com>,
        Shreyas K K <quic_shrekk@...cinc.com>,
        Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH stable 4.19] arm64: errata: Remove AES hwcap for COMPAT
 tasks

On Thu, Oct 20, 2022 at 04:01:07PM -0700, Florian Fainelli wrote:
> From: James Morse <james.morse@....com>
> 
> commit 44b3834b2eed595af07021b1c64e6f9bc396398b upstream
> 
> Cortex-A57 and Cortex-A72 have an erratum where an interrupt that
> occurs between a pair of AES instructions in aarch32 mode may corrupt
> the ELR. The task will subsequently produce the wrong AES result.
> 
> The AES instructions are part of the cryptographic extensions, which are
> optional. User-space software will detect the support for these
> instructions from the hwcaps. If the platform doesn't support these
> instructions a software implementation should be used.
> 
> Remove the hwcap bits on affected parts to indicate user-space should
> not use the AES instructions.
> 
> Acked-by: Ard Biesheuvel <ardb@...nel.org>
> Signed-off-by: James Morse <james.morse@....com>
> Link: https://lore.kernel.org/r/20220714161523.279570-3-james.morse@arm.com
> Signed-off-by: Will Deacon <will@...nel.org>
> [florian: resolved conflicts in arch/arm64/tools/cpucaps and cpu_errata.c]
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> Change-Id: I651a0db2e9d2f304d210ae979ae586e7dcc9744d

No need for Change-Id: in upstream patches :)