linux-kernel - Re: [PATCH v3] kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAHk-=wiWTPjGk5BDUu-49LeTAr21qurcv9BnjmrYi=ZqbFfufg@mail.gmail.com>
Date: Sat, 1 Feb 2025 12:10:00 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Arnd Bergmann <arnd@...db.de>, Daniel Gomez <da.gomez@...sung.com>, 
	Luis Chamberlain <mcgrof@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Petr Pavlu <petr.pavlu@...e.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>, linux-arch@...r.kernel.org, 
	linux-modules@...r.kernel.org
Subject: Re: [PATCH v3] kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED_KSYMS

On Sat, 1 Feb 2025 at 10:51, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> This commit addresses the issue by leveraging modpost. Symbol names
> passed to symbol_get() are recorded in the special .no_trim_symbol
> section, which is then parsed by modpost to forcibly keep such symbols.
> The .no_trim_symbol section is discarded by the linker scripts, so there
> is no impact on the size of the final vmlinux or modules.

LGTM. And I still assume that I'll just get it in some future kbuild fixes pull.

          Linus