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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 7227FC43441 for ; Wed, 21 Nov 2018 22:29:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 321C920821 for ; Wed, 21 Nov 2018 22:29:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 321C920821 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 S2390121AbeKVJFt (ORCPT ); Thu, 22 Nov 2018 04:05:49 -0500 Received: from mga11.intel.com ([192.55.52.93]:48434 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731924AbeKVJFt (ORCPT ); Thu, 22 Nov 2018 04:05:49 -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 fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Nov 2018 14:29:30 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,262,1539673200"; d="scan'208";a="91156265" 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 14:29:29 -0800 Subject: Re: [Patch v7 14/18] x86/speculation: Add 'seccomp' Spectre v2 app to app protection mode To: Jiri Kosina , Thomas Gleixner Cc: Linus Torvalds , Tom Lendacky , Ingo Molnar , Peter Zijlstra , 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 , linux-kernel@vger.kernel.org, x86@kernel.org, stable@vger.kernel.org, Jiri Kosina References: 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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/20/2018 04:08 PM, Tim Chen wrote: > From: Jiri Kosina > > If 'prctl' mode of app2app protection from spectre_v2 is selected on > kernel command-line, we are currently applying STIBP protection to > tasks that restrict their indirect branch speculation via > > prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIR_BRANCH, PR_SPEC_ENABLE, 0, 0); > > Let's extend this to cover also SECCOMP tasks (analogically to how we > apply SSBD protection). > > According to software guidance: > > "Setting ... STIBP ... on a logical processor prevents the predicted > targets of indirect branches on any logical processor of that core > from being controlled by software that executes (or executed > previously) on another logical processor of the same core." > > https://software.intel.com/security-software-guidance/insights/deep-dive-single-thread-indirect-branch-predictors > > Hence setting STIBP on a sandboxed task will prevent the task > from attacking other sibling threads or getting attacked. > > Signed-off-by: Jiri Kosina > Signed-off-by: Tim Chen > --- Will need this chunk added, which I missed in my update of Jiri's patch. 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)