linux-kernel - Re: [PATCH] module: use hidden visibility for weak symbol references

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Message-Id: <160389413619.1112960.12611093041695506337.b4-ty@kernel.org>
Date:   Wed, 28 Oct 2020 15:12:34 +0000
From:   Will Deacon <will@...nel.org>
To:     Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH] module: use hidden visibility for weak symbol references

On Tue, 27 Oct 2020 16:11:32 +0100, Ard Biesheuvel wrote:
> Geert reports that commit be2881824ae9eb92 ("arm64/build: Assert for
> unwanted sections") results in build errors on arm64 for configurations
> that have CONFIG_MODULES disabled.
> 
> The commit in question added ASSERT()s to the arm64 linker script to
> ensure that linker generated sections such as .got, .plt etc are empty,
> but as it turns out, there are corner cases where the linker does emit
> content into those sections. More specifically, weak references to
> function symbols (which can remain unsatisfied, and can therefore not
> be emitted as relative references) will be emitted as GOT and PLT
> entries when linking the kernel in PIE mode (which is the case when
> CONFIG_RELOCATABLE is enabled, which is on by default).
> 
> [...]

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

[1/1] module: use hidden visibility for weak symbol references
      https://git.kernel.org/arm64/c/13150bc5416f

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev