linux-hardening - Re: [PATCH v4 26/26] arm64: kernel: move ID map out of .text mapping

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Message-ID: <202206130951.57B5E48736@keescook>
Date:   Mon, 13 Jun 2022 09:52:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, Marc Zyngier <maz@...nel.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Brown <broonie@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH v4 26/26] arm64: kernel: move ID map out of .text mapping

On Mon, Jun 13, 2022 at 04:45:50PM +0200, Ard Biesheuvel wrote:
> Reorganize the ID map slightly so that only code that is executed via
> the 1:1 mapping remains. This allows to move the ID map out of the .text
> segment, given that it no longer needs exec permissions via the kernel
> mapping.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>

This could be done earlier in the series, yes?

Regardless:

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook