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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 BCF02C169C4 for ; Mon, 11 Feb 2019 14:44:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A8EB214DA for ; Mon, 11 Feb 2019 14:44:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896241; bh=6oMa6hyWG6ixEvU3IKZcCdhZnI93M4uuNL38M6dELfA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RmT7BPmeLWlW/8X/VvvGswtFH0hAV4PxpekqFaRvwBWvLIIyNr9c/gdr0ZC7VmsmL vbmXNDEmb+xjjJ2YCXR+/D618Yc3y12XMJcHJWJKZCndeMyq7xBrYuGDuz4sYV4/UE zLNIwc3oFuEWzRe1Yu5sYCw/iWZUIO7SuzAC2SuM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728253AbfBKOn7 (ORCPT ); Mon, 11 Feb 2019 09:43:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:56464 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728736AbfBKOn4 (ORCPT ); Mon, 11 Feb 2019 09:43:56 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B722F20844; Mon, 11 Feb 2019 14:43:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896236; bh=6oMa6hyWG6ixEvU3IKZcCdhZnI93M4uuNL38M6dELfA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EYA1306Eeti8vCw2jwRXvXoYn27lErffFOzfboHIhdgM0Ofc4BcdUf8/l39rtKVxr Y2G25l84uXON7pl3KD6+NNIU/ocM2/qYemiYG7V5hXofXRNkJQdZEPSbkabqaBDnj+ KF2YFbBkECZBv7jIgx5FnOl9wjjx9IYDYX+vDyYo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sebastian Andrzej Siewior , Borislav Petkov , Rik van Riel , "H. Peter Anvin" , "Jason A. Donenfeld" , Andy Lutomirski , Dave Hansen , Ingo Molnar , Jann Horn , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , kvm ML , x86-ml , Sasha Levin Subject: [PATCH 4.19 090/313] x86/fpu: Add might_fault() to user_insn() Date: Mon, 11 Feb 2019 15:16:10 +0100 Message-Id: <20190211141859.868429614@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141852.749630980@linuxfoundation.org> References: <20190211141852.749630980@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 6637401c35b2f327a35d27f44bda05e327f2f017 ] Every user of user_insn() passes an user memory pointer to this macro. Add might_fault() to user_insn() so we can spot users which are using this macro in sections where page faulting is not allowed. [ bp: Space it out to make it more visible. ] Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Borislav Petkov Reviewed-by: Rik van Riel Cc: "H. Peter Anvin" Cc: "Jason A. Donenfeld" Cc: Andy Lutomirski Cc: Dave Hansen Cc: Ingo Molnar Cc: Jann Horn Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Thomas Gleixner Cc: kvm ML Cc: x86-ml Link: https://lkml.kernel.org/r/20181128222035.2996-6-bigeasy@linutronix.de Signed-off-by: Sasha Levin --- arch/x86/include/asm/fpu/internal.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index 69dcdf195b61..fa2c93cb42a2 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -106,6 +106,9 @@ extern void fpstate_sanitize_xstate(struct fpu *fpu); #define user_insn(insn, output, input...) \ ({ \ int err; \ + \ + might_fault(); \ + \ asm volatile(ASM_STAC "\n" \ "1:" #insn "\n\t" \ "2: " ASM_CLAC "\n" \ -- 2.19.1