linux-kernel - Re: [PATCH v3 1/5] x86,kvm: Add MSR_KVM_GET_RNG

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Message-ID: <CAKB9nXs=htVXQciEfXQ4tMnLJT8RemHoVs+dVGPWXN+rGbdk6g@mail.gmail.com>
Date:	Thu, 17 Jul 2014 10:43:49 -0700
From:	Andrew Honig <ahonig@...gle.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	kvm <kvm@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>,
	"Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
	Kees Cook <keescook@...omium.org>, 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>, bsd@...hat.com
Subject: Re: [PATCH v3 1/5] x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching
 feature bit

> +       case MSR_KVM_GET_RNG_SEED:
> +               get_random_bytes(&data, sizeof(data));
> +               break;

Should this be rate limited in the interest of conserving randomness?
If there ever is an attack on the prng, this would create very
favorable conditions for an attacker to exploit it.
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