linux-kernel - Re: [PATCH] module: combine constructors in module linker script

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Date:   Thu, 8 Jul 2021 16:11:51 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Reiner Huober <reiner.huober@...ia.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] module: combine constructors in module linker script

+++ Reiner Huober [06/07/21 15:02 +0200]:
>The constructor code for modules must be aware of init code inside
>different sections.
>
>Newer GCC compilers write constructors in more than one section,
>e.g. ".ctors.65435". These must be combined into a single
>".ctors" section. In the module loader, only the ".ctors" section
>is searched and the constructors therein are initialized, when
>CONFIG_CONSTRUCTORS=y is set. Other constructors are ignored.
>
>This change combines all ".ctors.*" and the ".ctors" section, if any,
>in <module>.ko into a single ."ctors" section.
>
>For code coverage in GCC, this is necessary to show the
>code coverage for modules, since code coverage uses such
>constructors when initializing a module in newer version of GCC.
>
>Signed-off-by: Reiner Huober <reiner.huober@...ia.com>

Thanks, I'll queue this up after the merge window is over.

Jessica