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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT 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 4B680C433F4 for ; Thu, 20 Sep 2018 07:57:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E082D21524 for ; Thu, 20 Sep 2018 07:57:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JyS5UCmO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E082D21524 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org 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 S1731562AbeITNjh (ORCPT ); Thu, 20 Sep 2018 09:39:37 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:46110 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726383AbeITNjg (ORCPT ); Thu, 20 Sep 2018 09:39:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7E0FRItJ2432DffZFxbBE3fsZ6GvjipO9a8Ko3bTbQw=; b=JyS5UCmOyVqOiVJ4acQgghl2F s3tqb5RHjspwqyu0vkLz9OZ9jh3iuidCNq3w7b1+aPeXyFZhVUtNpUVYHoc3MjwZneuz58I2gOu2Z LqD4AUOjwXvXHkc55fdDJq2jRkw6J7iH85STFnhMjXKi+Va1+o+h/m53vnBO0lcE+yntEc+RtYrEh rSDQ/0hWJihJaaR8DbbSpGdm1WHgFe/kkOkkkQJ3r4W1FKia1g4WLF58qhmfBuadYU5ZcohDi31ub C+fvGSgx0ZUNIkmmDHNWF1SopNaYem028fZUPAwKid5Gn2TZL+T/Gh3QUghtM6BGKLs3IjDpwjDKI DbHCwkwUA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1g2tpw-0005UE-Rm; Thu, 20 Sep 2018 07:57:21 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 491ED201EC166; Thu, 20 Sep 2018 09:57:17 +0200 (CEST) Date: Thu, 20 Sep 2018 09:57:17 +0200 From: Peter Zijlstra To: Tim Chen Cc: Jiri Kosina , Thomas Gleixner , Tom Lendacky , Ingo Molnar , Josh Poimboeuf , Andrea Arcangeli , David Woodhouse , Andi Kleen , Dave Hansen , Casey Schaufler , Asit Mallick , Arjan van de Ven , Jon Masters , linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH 2/2] x86/speculation: Provide application property based STIBP protection Message-ID: <20180920075717.GL24124@hirez.programming.kicks-ass.net> References: <0c55c162a077aadbfd57878e2694e35292c1a29c.1537392876.git.tim.c.chen@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0c55c162a077aadbfd57878e2694e35292c1a29c.1537392876.git.tim.c.chen@linux.intel.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 19, 2018 at 02:35:30PM -0700, Tim Chen wrote: > + if (get_dumpable(tsk->mm) != SUID_DUMP_USER) > + test_and_set_tsk_thread_flag(tsk, TIF_STIBP); > + else > + test_and_clear_tsk_thread_flag(tsk, TIF_STIBP); > +} s/test_and_//