linux-kernel - Re: [PATCH] gcc-plugins: randstruct: Only warn about true flexible arrays

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Message-Id: <169948201624.633716.16405667177938568487.b4-ty@chromium.org>
Date:   Wed,  8 Nov 2023 14:20:18 -0800
From:   Kees Cook <keescook@...omium.org>
To:     KP Singh <kpsingh@...nel.org>, Kees Cook <keescook@...omium.org>
Cc:     linux-hardening@...r.kernel.org, kernel test robot <lkp@...el.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gcc-plugins: randstruct: Only warn about true flexible arrays

On Sat, 04 Nov 2023 13:43:37 -0700, Kees Cook wrote:
> The randstruct GCC plugin tried to discover "fake" flexible arrays
> to issue warnings about them in randomized structs. In the future
> LSM overhead reduction series, it would be legal to have a randomized
> struct with a 1-element array, and this should _not_ be treated as a
> flexible array, especially since commit df8fc4e934c1 ("kbuild: Enable
> -fstrict-flex-arrays=3"). Disable the 0-sized and 1-element array
> discovery logic in the plugin, but keep the "true" flexible array check.
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] gcc-plugins: randstruct: Only warn about true flexible arrays
      https://git.kernel.org/kees/c/1ee60356c2dc

Take care,

-- 
Kees Cook