linux-kernel - Re: [kernel-hardening] [PATCH] random: warn when kernel uses unseeded randomness

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Date:   Thu, 22 Jun 2017 02:04:57 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Theodore Ts'o" <tytso@....edu>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Jeffrey Walton <noloader@...il.com>, tglx@...akpoint.cc,
        David Miller <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel-hardening@...ts.openwall.com,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [kernel-hardening] [PATCH] random: warn when kernel uses unseeded randomness

Hi Ted,

On Wed, Jun 21, 2017 at 10:38 PM, Theodore Ts'o <tytso@....edu> wrote:
> I agree completely with all of this.  The following patch replaces the
> current topmost patch on the random.git tree:
> For developers who want to work on improving this situation,
> CONFIG_WARN_UNSEEDED_RANDOM has been renamed to
> CONFIG_WARN_ALL_UNSEEDED_RANDOM.  By default the kernel will always
> print the first use of unseeded randomness.  This way, hopefully the
> security obsessed will be happy that there is _some_ indication when
> the kernel boots there may be a potential issue with that architecture
> or subarchitecture.  To see all uses of unseeded randomness,
> developers can enable CONFIG_WARN_ALL_UNSEEDED_RANDOM.

Seems fine to me.

Acked-by: Jason A. Donenfeld <Jason@...c4.com>

Jason