linux-kernel - Re: [PATCH v4] gcc-plugins: latent

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Date:   Tue, 12 Apr 2022 11:32:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        PaX Team <pageexec@...email.hu>,
        linux-hardening@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>, stable@...r.kernel.org
Subject: Re: [PATCH v4] gcc-plugins: latent_entropy: use /dev/urandom

On Wed, 6 Apr 2022 00:28:15 +0200, Jason A. Donenfeld wrote:
> While the latent entropy plugin mostly doesn't derive entropy from
> get_random_const() for measuring the call graph, when __latent_entropy is
> applied to a constant, then it's initialized statically to output from
> get_random_const(). In that case, this data is derived from a 64-bit
> seed, which means a buffer of 512 bits doesn't really have that amount
> of compile-time entropy.
> 
> [...]

Applied to for-v5.18/hardening, thanks!

I dropped the version number change, added a pointer to the GCC bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105171, and noted the
rationale for the buffer size. I'll get this sent to Linus shortly.

[1/1] gcc-plugins: latent_entropy: use /dev/urandom
      https://git.kernel.org/kees/c/c40160f2998c

-- 
Kees Cook