From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDB73C43441 for ; Thu, 22 Nov 2018 02:28:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABF8E2080F for ; Thu, 22 Nov 2018 02:28:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ABF8E2080F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389097AbeKVNFq (ORCPT ); Thu, 22 Nov 2018 08:05:46 -0500 Received: from mga14.intel.com ([192.55.52.115]:18786 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732781AbeKVNFq (ORCPT ); Thu, 22 Nov 2018 08:05:46 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Nov 2018 18:24:33 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,263,1539673200"; d="scan'208";a="91199096" Received: from schen9-desk.jf.intel.com (HELO [10.54.74.144]) ([10.54.74.144]) by orsmga007.jf.intel.com with ESMTP; 21 Nov 2018 18:24:32 -0800 To: Thomas Gleixner , LKML Cc: x86@kernel.org, Peter Zijlstra , Andy Lutomirski , Linus Torvalds , Jiri Kosina , Tom Lendacky , Josh Poimboeuf , Andrea Arcangeli , David Woodhouse , Andi Kleen , Dave Hansen , Casey Schaufler , Asit Mallick , Arjan van de Ven , Jon Masters , Waiman Long , Greg KH , Dave Stewart , Kees Cook References: <20181121201430.559770965@linutronix.de> <20181121201724.602740969@linutronix.de> From: Tim Chen Openpgp: preference=signencrypt Autocrypt: addr=tim.c.chen@linux.intel.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 MIME-Version: 1.0 In-Reply-To: <20181121201724.602740969@linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 21, 2018 at 09:14:54PM +0100, Thomas Gleixner wrote: > From: Jiri Kosina > > If 'prctl' mode of app2app protection from spectre v2 is selected on the > kernel command-line, STIBP and IBPB are applied on tasks which restrict > their indirect branch speculation via prctl. > > SECCOMP enables the SSBD mitigation for sandboxed tasks already, so it > makes sense to prevent spectre v2 application to application attacks as > well. Will need to add this chunk. Thanks. Tim diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index c4d010d..d070e84 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -275,6 +275,7 @@ enum spectre_v2_app2app_cmd { { "off", SPECTRE_V2_APP2APP_CMD_NONE, false }, { "on", SPECTRE_V2_APP2APP_CMD_FORCE, true }, { "prctl", SPECTRE_V2_APP2APP_CMD_PRCTL, false }, + { "seccomp", SPECTRE_V2_APP2APP_CMD_SECCOMP, false }, }; static void __init spec_v2_app_print_cond(const char *reason, bool secure)