From patchwork Thu Jan 2 22:06:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 234748 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 439C1C3276E for ; Thu, 2 Jan 2020 22:23:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1A0BE21835 for ; Thu, 2 Jan 2020 22:23:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003825; bh=xF54mOLpbSb1dQitUM6FwEUU1UUEJcNSOBzBfaDG8Ik=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FNo5PD2aXgyaKEcs+BP8KUCWrDWzBfAHr6iQRkA5e1QEKSsbm5VFst939MmEUJxAT 7GeXoMHCACslaN1UX89WtdxKy6U0wf1lSVahx+J7L/pM/qMC5ESBeOgcC1XPrYCaCq zqud65XhA8UwvPIuZzCrygYdNgPVTpX9sdvaWUIg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728633AbgABWXn (ORCPT ); Thu, 2 Jan 2020 17:23:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:46394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727889AbgABWXm (ORCPT ); Thu, 2 Jan 2020 17:23:42 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 7A5EE20863; Thu, 2 Jan 2020 22:23:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003822; bh=xF54mOLpbSb1dQitUM6FwEUU1UUEJcNSOBzBfaDG8Ik=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uy5FQm1tToudblxkrBb9TNVp+WmPKgmPb7GsYjHjWDQUZ93GspsU5kOckcnyEBGoF BKfh1VoWdIYREG3zAipaW9MumWAiTEdBs2vLh6kdsnXJMwC9loApwYEqe9tQaGJ5h/ 9OphQ0day25JgOp4kwiRZ7ojSwwNKs5LPyHnBIzw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anthony Steinhauser , Michael Ellerman , Sasha Levin Subject: [PATCH 4.14 14/91] powerpc/security/book3s64: Report L1TF status in sysfs Date: Thu, 2 Jan 2020 23:06:56 +0100 Message-Id: <20200102220412.758106117@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220356.856162165@linuxfoundation.org> References: <20200102220356.856162165@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Anthony Steinhauser [ Upstream commit 8e6b6da91ac9b9ec5a925b6cb13f287a54bd547d ] Some PowerPC CPUs are vulnerable to L1TF to the same extent as to Meltdown. It is also mitigated by flushing the L1D on privilege transition. Currently the sysfs gives a false negative on L1TF on CPUs that I verified to be vulnerable, a Power9 Talos II Boston 004e 1202, PowerNV T2P9D01. Signed-off-by: Anthony Steinhauser Signed-off-by: Michael Ellerman [mpe: Just have cpu_show_l1tf() call cpu_show_meltdown() directly] Link: https://lore.kernel.org/r/20191029190759.84821-1-asteinhauser@google.com Signed-off-by: Sasha Levin --- arch/powerpc/kernel/security.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index f5d6541bf8c2..fef3f09fc238 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -160,6 +160,11 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, cha return sprintf(buf, "Vulnerable\n"); } + +ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf) +{ + return cpu_show_meltdown(dev, attr, buf); +} #endif ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)