From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zCLV50Dm0zDqmy for ; Fri, 5 Jan 2018 08:27:08 +1100 (AEDT) Date: Thu, 4 Jan 2018 22:27:04 +0100 From: Michal =?UTF-8?B?U3VjaMOhbmVr?= To: Christian Zigotzky Cc: linuxppc-dev@lists.ozlabs.org Subject: Re: Spectre+Meltdown Message-ID: <20180104222704.5a9b490d@naga.suse.cz> In-Reply-To: <36E75811-C758-49B1-8E5C-3A2C44FD5DE9@xenosoft.de> References: <36E75811-C758-49B1-8E5C-3A2C44FD5DE9@xenosoft.de> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hello, On Thu, 4 Jan 2018 16:09:34 +0100 Christian Zigotzky wrote: > Hi All, > > Do we have some information regarding Spectre+Meltdown for our users? > > It could be that we have some security issues in our PowerPC CPUs. > > Links: > > https://www.phoronix.com/scan.php?page=news_item&px=Linux-Kernel-Retpoline-Patches > > https://www.phoronix.com/scan.php?page=news_item&px=x86-PTI-EPYC-Linux-4.15-Test > Since the vulnerability details were disclosed already you should see patches addressing it in your local kernel git repository. AFAICT some patches for preventing speculative execution in some random parts of the kernel as well as adding an extra flush when returning from kernel to userspace are applicable to powerpc. I am not familiar with all the details so you are free to investigate the code for yourself or fish some article from someone who really knows what the thing is all about and how it affects powerpc in particular. Thanks Michal