linux-kernel - Re: [PATCH 7/7] arm64: add a workaround for GNU gold with ARM64_MODULE

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Message-ID: <CAKv+Gu_j7wnJcVmB0sHqiehK-fv4EGV2MXTJM4PTGpMY-P7MVQ@mail.gmail.com>
Date:   Thu, 30 Nov 2017 09:31:42 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Alex Matveev <alxmtvv@...il.com>, Andi Kleen <ak@...ux.intel.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kbuild@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH 7/7] arm64: add a workaround for GNU gold with ARM64_MODULE_PLTS

On 29 November 2017 at 23:44, Sami Tolvanen <samitolvanen@...gle.com> wrote:
> All current versions of GNU gold crash when linking kernel modules
> with ARM64_MODULE_PLTS due to a known bug:
>
>   https://sourceware.org/bugzilla/show_bug.cgi?id=14592
>
> To work around the problem, this change removes NOLOAD from .plt
> and .init.plt.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

> ---
>  arch/arm64/kernel/module.lds | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kernel/module.lds b/arch/arm64/kernel/module.lds
> index f7c9781a9d48..eacb5c67f61e 100644
> --- a/arch/arm64/kernel/module.lds
> +++ b/arch/arm64/kernel/module.lds
> @@ -1,4 +1,4 @@
>  SECTIONS {
> -       .plt (NOLOAD) : { BYTE(0) }
> -       .init.plt (NOLOAD) : { BYTE(0) }
> +       .plt : { BYTE(0) }
> +       .init.plt : { BYTE(0) }
>  }
> --
> 2.15.0.531.g2ccb3012c9-goog
>