linux-hardening - Re: [PATCH] gcc-plugins: Undefine LATENT_ENTROPY

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Message-Id: <166067790682.7084.237943534143309650.b4-ty@chromium.org>
Date:   Tue, 16 Aug 2022 12:25:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linuxppc-dev@...ts.ozlabs.org, linux-hardening@...r.kernel.org,
        ajd@...ux.ibm.com
Cc:     Kees Cook <keescook@...omium.org>, yury.norov@...il.com,
        erhard_f@...lbox.org
Subject: Re: [PATCH] gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file

On Tue, 16 Aug 2022 15:17:20 +1000, Andrew Donnellan wrote:
> Commit 36d4b36b6959 ("lib/nodemask: inline next_node_in() and
> node_random()") refactored some code by moving node_random() from
> lib/nodemask.c to include/linux/nodemask.h, thus requiring nodemask.h to
> include random.h, which conditionally defines add_latent_entropy()
> depending on whether the macro LATENT_ENTROPY_PLUGIN is defined.
> 
> This broke the build on powerpc, where nodemask.h is indirectly included
> in arch/powerpc/kernel/prom_init.c, part of the early boot machinery that
> is excluded from the latent entropy plugin using
> DISABLE_LATENT_ENTROPY_PLUGIN. It turns out that while we add a gcc flag
> to disable the actual plugin, we don't undefine LATENT_ENTROPY_PLUGIN.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file
      https://git.kernel.org/kees/c/2d08c71d2c79

-- 
Kees Cook