linux-kernel - Re: [PATCH] random32: Restore __latent_entropy attribute on net_rand

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Message-ID: <202010051910.BC7E9F4@keescook>
Date:   Mon, 5 Oct 2020 19:12:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thibaut Sautereau <thibaut.sautereau@...p-os.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Willy Tarreau <w@....eu>, Emese Revfy <re.emese@...il.com>,
        Theodore Ts'o <tytso@....edu>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] random32: Restore __latent_entropy attribute on
 net_rand_state

On Fri, Oct 02, 2020 at 05:16:11PM +0200, Thibaut Sautereau wrote:
> From: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
> 
> Commit f227e3ec3b5c ("random32: update the net random state on interrupt
> and activity") broke compilation and was temporarily fixed by Linus in
> 83bdc7275e62 ("random32: remove net_rand_state from the latent entropy
> gcc plugin") by entirely moving net_rand_state out of the things handled
> by the latent_entropy GCC plugin.
> 
> From what I understand when reading the plugin code, using the
> __latent_entropy attribute on a declaration was the wrong part and
> simply keeping the __latent_entropy attribute on the variable definition
> was the correct fix.
> 
> Fixes: 83bdc7275e62 ("random32: remove net_rand_state from the latent entropy gcc plugin")
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Willy Tarreau <w@....eu>
> Cc: Emese Revfy <re.emese@...il.com>
> Signed-off-by: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>

Yes, that looks correct. Thank you!

Acked-by: Kees Cook <keescook@...omium.org>

I'm not sure the best tree for this. Ted, Andrew, Linus? I'll take it
via my gcc plugin tree if no one else takes it. :)

-- 
Kees Cook