Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030213AbbDWQLt (ORCPT ); Thu, 23 Apr 2015 12:11:49 -0400 Received: from mail.skyhub.de ([78.46.96.112]:54961 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965896AbbDWQLs (ORCPT ); Thu, 23 Apr 2015 12:11:48 -0400 Date: Thu, 23 Apr 2015 18:11:38 +0200 From: Borislav Petkov To: Linus Torvalds Cc: Andy Lutomirski , Denys Vlasenko , Ingo Molnar , Brian Gerst , Steven Rostedt , "H. Peter Anvin" , Oleg Nesterov , Frederic Weisbecker , Alexei Starovoitov , Will Drewry , Kees Cook , the arch/x86 maintainers , Linux Kernel Mailing List Subject: Re: [PATCH] x86/asm/entry/32: Restore %ss before SYSRETL if necessary Message-ID: <20150423161138.GO28327@pd.tnic> References: <1429792491-5978-1-git-send-email-dvlasenk@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 746 Lines: 20 On Thu, Apr 23, 2015 at 09:05:07AM -0700, Linus Torvalds wrote: > So it sounds very much like an AMD bug/misfeature. Because sysret > *should* reset the descriptor cache. Do we know whether this affects > *all* AMD CPU's or just a subset? I am being told that this might appear to be the case with at least one uarch. I could run code on the boxes I have here to check if Andy comes up with some nice little "exploit". -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/