linux-kernel - Re: [PATCH v2 0/3] arm64/boot: Forbid the use of BSS symbols in startup code

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Message-Id: <174740792413.188921.9613065517341295309.b4-ty@kernel.org>
Date: Fri, 16 May 2025 16:37:44 +0100
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	Ard Biesheuvel <ardb+git@...gle.com>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	mark.rutland@....com,
	Ard Biesheuvel <ardb@...nel.org>,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: Re: [PATCH v2 0/3] arm64/boot: Forbid the use of BSS symbols in startup code

On Thu, 08 May 2025 13:43:29 +0200, Ard Biesheuvel wrote:
> Move any variables accessed or assigned by the startup code out of BSS,
> and into .data, so that we can forbid the use of BSS variables
> altogether, by ASSERT()'ing in the linker script that each symbol made
> available to the startup code lives before __bss_start in the linker
> map.
> 
> Changes since v1:
> - fix build error due to missing declaration in #1
> - work around Clang complaining about the ASSERT() expression in the
>   linker script
> 
> [...]

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

[1/3] arm64/boot: Move init_pgdir[] and init_idmap_pgdir[] into __pi_ namespace
      https://git.kernel.org/arm64/c/93d0d6f8a654
[2/3] arm64/boot: Move global CPU override variables out of BSS
      https://git.kernel.org/arm64/c/4afff6cc9a55
[3/3] arm64/boot: Disallow BSS exports to startup code
      https://git.kernel.org/arm64/c/90530521079e

Cheers,
-- 
Will

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