From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (193.142.43.55:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 06 Apr 2020 18:38:07 -0000 Received: from mail.kernel.org ([198.145.29.99]) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jLWdK-0007n0-6h for speck@linutronix.de; Mon, 06 Apr 2020 20:38:06 +0200 Date: Mon, 6 Apr 2020 20:37:56 +0200 From: Greg KH Subject: [MODERATED] Re: [PATCH 2/3] V5 more sampling fun 2 Message-ID: <20200406183756.GA182004@kroah.com> References: <5e8b71d8.1c69fb81.64075.43abSMTPIN_ADDED_BROKEN@mx.google.com> <202004061133.92517B7@keescook> MIME-Version: 1.0 In-Reply-To: <202004061133.92517B7@keescook> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: speck@linutronix.de List-ID: On Mon, Apr 06, 2020 at 11:34:17AM -0700, speck for Kees Cook wrote: > > + By default, this issue is mitigated by > > + microcode. However, the microcode fix can cause > > + the RDRAND and RDSEED instructions to become > > + much slower. Among other effects, this will > > + result in reduced throughput from /dev/urandom. > > This is this true about /dev/urandom? I thought the RDRAND dependency > had been removed? That dependancy will be removed in 5.7-rc1 and I will be backporting that to the stable kernels "soon". thanks, greg k-h