linux-kernel - Re: [PATCH v3 6/7] arm64, elf: Disable automatic READ_IMPLIES

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Message-ID: <20200212092800.GD488264@arrakis.emea.arm.com>
Date:   Wed, 12 Feb 2020 09:28:00 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Hector Marco-Gisbert <hecmargi@....es>,
        Will Deacon <will.deacon@....com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Jann Horn <jannh@...gle.com>,
        Russell King <linux@...linux.org.uk>, x86@...nel.org,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3 6/7] arm64, elf: Disable automatic READ_IMPLIES_EXEC
 for 64-bit address spaces

On Mon, Feb 10, 2020 at 11:30:48AM -0800, Kees Cook wrote:
> With arm64 64-bit environments, there should never be a need for automatic
> READ_IMPLIES_EXEC, as the architecture has always been execute-bit aware
> (as in, the default memory protection should be NX unless a region
> explicitly requests to be executable).
> 
> Suggested-by: Hector Marco-Gisbert <hecmargi@....es>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>