linux-kernel - Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 16 Jul 2014 15:59:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	kvm list <kvm@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Bandan Das <bsd@...hat.com>
Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64

On 07/16/2014 03:40 PM, Andy Lutomirski wrote:
> On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski <luto@...capital.net> wrote:
>> My personal preference is to defer this until some user shows up.  I
>> think that even this would be too complicated for KASLR, which is the
>> only extremely early-boot user that I found.
>>
>> Hmm.  Does the prandom stuff want to use this?
> 
> prandom isn't even using rdrand.  I'd suggest fixing this separately,
> or even just waiting until someone goes and deletes prandom.
> 

prandom is exactly the opposite; it is designed for when we need
possibly low quality random numbers very quickly.  RDRAND is actually
too slow.

	-hpa


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/