linux-kernel - Re: [PATCH 3/3] vsprintf: Add use-early-random-bytes cmd line option

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Date:   Wed, 2 May 2018 11:27:58 +1000
From:   tcharding <me@...in.cc>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Theodore Ts'o <tytso@....edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 3/3] vsprintf: Add use-early-random-bytes cmd line option

On Wed, May 02, 2018 at 01:02:34AM +0000, Linus Torvalds wrote:
> On Tue, May 1, 2018 at 4:34 PM Tobin C. Harding <me@...in.cc> wrote:
> 
> 
> > This option should NOT be enabled on production kernels.
> 
> I think with your fixes to get_random_bytes_arch(), it's perfectly fine to
> use on production kernels (and doesn't even need a kernel command line
> option).
> 
> It was only with the "use weak crypto" (that get_random_bytes_arch() used
> to fall back on) that it was a problem. That fixed "verify that
> get_random_bytes_arch() really uses hw crypto" is certainly not weak crypto.

Ok, I'll wait to see if anyone with a more paranoid disposition adds to
this otherwise will implement as suggested.

thanks,
Tobin.