linux-kernel - Re: [PATCH 7/9] arm64/build: Warn on orphan section placement

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Message-ID: <20200317215614.GB20788@willie-the-truck>
Date:   Tue, 17 Mar 2020 21:56:14 +0000
From:   Will Deacon <will@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...e.de>, "H.J. Lu" <hjl.tools@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] arm64/build: Warn on orphan section placement

On Thu, Feb 27, 2020 at 04:22:42PM -0800, Kees Cook wrote:
> We don't want to depend on the linker's orphan section placement
> heuristics as these can vary between linkers, and may change between
> versions. All sections need to be explicitly named in the linker
> script.
> 
> Explicitly include debug sections when they're present. Add .eh_frame*
> to discard as it seems that these are still generated even though
> -fno-asynchronous-unwind-tables is being specified. Add .plt and
> .data.rel.ro to discards as they are not actually used. Add .got.plt
> to the image as it does appear to be mapped near .data. Finally enable
> orphan section warnings.

Hmm, I don't understand what .got.plt is doing here. Please can you
elaborate?

Will