linux-kernel - Re: [PATCH v3 0/2] Fix kallsyms with CONFIG_LTO

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Message-Id: <172373965417.621926.8551687004756195926.b4-ty@kernel.org>
Date: Thu, 15 Aug 2024 09:34:17 -0700
From: Kees Cook <kees@...nel.org>
To: live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Song Liu <song@...nel.org>
Cc: Kees Cook <kees@...nel.org>,
	jpoimboe@...nel.org,
	jikos@...nel.org,
	mbenes@...e.cz,
	pmladek@...e.com,
	joe.lawrence@...hat.com,
	nathan@...nel.org,
	morbo@...gle.com,
	justinstitt@...gle.com,
	mcgrof@...nel.org,
	thunder.leizhen@...wei.com,
	kernel-team@...a.com,
	mmaurer@...gle.com,
	samitolvanen@...gle.com,
	mhiramat@...nel.org,
	rostedt@...dmis.org
Subject: Re: [PATCH v3 0/2] Fix kallsyms with CONFIG_LTO_CLANG

On Wed, 07 Aug 2024 15:05:11 -0700, Song Liu wrote:
> With CONFIG_LTO_CLANG, the compiler/linker adds .llvm.<hash> suffix to
> local symbols to avoid duplications. Existing scripts/kallsyms sorts
> symbols without .llvm.<hash> suffix. However, this causes quite some
> issues later on. Some users of kallsyms, such as livepatch, have to match
> symbols exactly.
> 
> Address this by sorting full symbols at build time, and let kallsyms
> lookup APIs to match the symbols exactly.
> 
> [...]

Applied to for-linus/hardening, thanks!

[1/2] kallsyms: Do not cleanup .llvm.<hash> suffix before sorting symbols
      https://git.kernel.org/kees/c/020925ce9299
[2/2] kallsyms: Match symbols exactly with CONFIG_LTO_CLANG
      https://git.kernel.org/kees/c/fb6a421fb615

Take care,

-- 
Kees Cook