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

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Date:   Mon, 5 Oct 2020 22:57:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Willy Tarreau <w@....eu>
Cc:     Thibaut Sautereau <thibaut.sautereau@...p-os.org>,
        "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>,
        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 Tue, Oct 06, 2020 at 04:28:09AM +0200, Willy Tarreau wrote:
> Hi Kees,
> 
> On Mon, Oct 05, 2020 at 07:12:29PM -0700, Kees Cook wrote:
> > 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. :)
> 
> It was already merged as commit 09a6b0bc3be79 and queued for -stable.

Ah, perfect! Thanks.

-- 
Kees Cook