linux-kernel - Re: [PATCH 2/3] random: Return nbytes filled from hw RNG

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Date:   Tue, 1 May 2018 20:19:21 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/3] random: Return nbytes filled from hw RNG

On Wed, May 02, 2018 at 09:33:39AM +1000, Tobin C. Harding wrote:
> Currently the function get_random_bytes_arch() has return value 'void'.
> If the hw RNG fails we currently fall back to using get_random_bytes().
> This defeats the purpose of requesting random material from the hw RNG
> in the first place.
> 
> There are currently no intree users of get_random_bytes_arch().
> 
> Only get random bytes from the hw RNG, make function return the number
> of bytes retrieved from the hw RNG.
> 
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Tobin C. Harding <me@...in.cc>

Acked-by: Theodore Ts'o <tytso@....edu>