linux-kernel - Re: [PATCH v2] arm64: link with -z norelro for LLD or aarch64-elf

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Date:   Tue,  5 Jan 2021 12:26:03 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Will Deacon <will@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     kernel-team <kernel-team@...roid.com>,
        "kernelci . org bot" <bot@...nelci.org>,
        linux-arm-kernel@...ts.infradead.org,
        Fāng-ruì Sòng <maskray@...gle.com>,
        Alan Modra <amodra@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Smith <Peter.Smith@....com>,
        Quentin Perret <qperret@...gle.com>,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH v2] arm64: link with -z norelro for LLD or aarch64-elf

On Thu, 17 Dec 2020 16:24:32 -0800, Nick Desaulniers wrote:
> With GNU binutils 2.35+, linking with BFD produces warnings for vmlinux:
> aarch64-linux-gnu-ld: warning: -z norelro ignored
> 
> BFD can produce this warning when the target emulation mode does not
> support RELRO program headers, and -z relro or -z norelro is passed.
> 
> Alan Modra clarifies:
>   The default linker emulation for an aarch64-linux ld.bfd is
>   -maarch64linux, the default for an aarch64-elf linker is
>   -maarch64elf.  They are not equivalent.  If you choose -maarch64elf
>   you get an emulation that doesn't support -z relro.
> 
> [...]

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

[1/1] arm64: link with -z norelro for LLD or aarch64-elf
      https://git.kernel.org/arm64/c/311bea3cb9ee

Also added the second Fixes tag with a cc stable.

-- 
Catalin