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]
Message-ID: <CALCETrUdqHPBOn_XEX3D7NUZSWTD8CcXpRK8RfiVYATJ5BuSjw@mail.gmail.com>
Date:	Wed, 13 Aug 2014 22:14:53 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, kvm list <kvm@...r.kernel.org>,
	"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>, Andrew Honig <ahonig@...gle.com>
Subject: Re: [PATCH v5 0/5] random,x86,kvm: Rework arch RNG seeds and get some
 from kvm

On Wed, Aug 13, 2014 at 7:41 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 08/13/2014 11:44 AM, H. Peter Anvin wrote:
>> On 08/13/2014 11:33 AM, Andy Lutomirski wrote:
>>>
>>> As for doing arch_random_init after clone/migration, I think we'll
>>> need another KVM extension for that, since, AFAIK, we don't actually
>>> get notified that we were cloned or migrated.  That will be
>>> nontrivial.  Maybe we can figure that out at KS, too.
>>>
>>
>> We don't need a reset when migrated (although it might be a good idea
>> under some circumstances, i.e. if the pools might somehow have gotten
>> exposed) but definitely when cloned.
>>
>
> But yes, we need a notification.  For obvious reasons there is no
> suspend event (one can snapshot a running VM) but we need to be notified
> upon wakeup, *or* we need to give KVM a way to update the necessary state.

This could presumably use the interrupt mechanism on virtio-rng if
we're willing to depend on having host support for virtio-rng.

v6 (coming in a few minutes) will at least get it right when the
kernel goes through the resume path (i.e. not KVM/QEMU suspend, and
maybe not S0ix either).

--Andy
--
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/

Powered by blists - more mailing lists