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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 095B6CA9EBC for ; Sun, 27 Oct 2019 21:34:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D178D205C9 for ; Sun, 27 Oct 2019 21:34:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572212082; bh=rM6KJb6cQvAyghTlAAUAHQOK4dd80lB0rRVdNlYI3iM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kRVcjMeudZmy5YxmuECQONpm5PdcxH8jGjVRyV+3QWGShZY+sWiNX3c9YQAgSnPo/ Rhrxh8UQfbIKQZSh8pvPH1vUgCvGRD5Q1kV8Feg3Tb0WmftOUxy4ad6hyzSE5ln6lR VZsOjzGmdrBdOWGvfsnNPh6WppeC9/Q6omT/pk3E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729670AbfJ0VK1 (ORCPT ); Sun, 27 Oct 2019 17:10:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:56848 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729701AbfJ0VK0 (ORCPT ); Sun, 27 Oct 2019 17:10:26 -0400 Received: from localhost (100.50.158.77.rev.sfr.net [77.158.50.100]) (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 A74702064A; Sun, 27 Oct 2019 21:10:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572210625; bh=rM6KJb6cQvAyghTlAAUAHQOK4dd80lB0rRVdNlYI3iM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KyE3z98ShWV2xwQLyw9Di7PBDdz2eo+2uiP6YVG+kZDCC0F4yyN3JxboPUEDw6vuV LbZtEMMCfIbbm0KY1PzPW9YR8xofhBxis/qW/q8dcIJqRnflV1pr1P3YHQW4Ur9kRe uxENPVupRDgrKi0p5g2lF24WSH9enqFKoBeZ45qg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , Jeremy Linton , Andre Przywara , Catalin Marinas , Stefan Wahren , Will Deacon , Ard Biesheuvel Subject: [PATCH 4.14 079/119] arm64: add sysfs vulnerability show for spectre-v2 Date: Sun, 27 Oct 2019 22:00:56 +0100 Message-Id: <20191027203344.735962234@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191027203259.948006506@linuxfoundation.org> References: <20191027203259.948006506@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jeremy Linton [ Upstream commit d2532e27b5638bb2e2dd52b80b7ea2ec65135377 ] Track whether all the cores in the machine are vulnerable to Spectre-v2, and whether all the vulnerable cores have been mitigated. We then expose this information to userspace via sysfs. Signed-off-by: Jeremy Linton Reviewed-by: Andre Przywara Reviewed-by: Catalin Marinas Tested-by: Stefan Wahren Signed-off-by: Will Deacon Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/cpu_errata.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -456,6 +456,10 @@ out_printmsg: .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, \ CAP_MIDR_RANGE_LIST(midr_list) +/* Track overall mitigation state. We are only mitigated if all cores are ok */ +static bool __hardenbp_enab = true; +static bool __spectrev2_safe = true; + /* * List of CPUs that do not need any Spectre-v2 mitigation at all. */ @@ -466,6 +470,10 @@ static const struct midr_range spectre_v { /* sentinel */ } }; +/* + * Track overall bp hardening for all heterogeneous cores in the machine. + * We are only considered "safe" if all booted cores are known safe. + */ static bool __maybe_unused check_branch_predictor(const struct arm64_cpu_capabilities *entry, int scope) { @@ -487,6 +495,8 @@ check_branch_predictor(const struct arm6 if (!need_wa) return false; + __spectrev2_safe = false; + if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) { pr_warn_once("spectrev2 mitigation disabled by kernel configuration\n"); __hardenbp_enab = false; @@ -496,11 +506,14 @@ check_branch_predictor(const struct arm6 /* forced off */ if (__nospectre_v2) { pr_info_once("spectrev2 mitigation disabled by command line option\n"); + __hardenbp_enab = false; return false; } - if (need_wa < 0) + if (need_wa < 0) { pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware\n"); + __hardenbp_enab = false; + } return (need_wa > 0); } @@ -663,3 +676,15 @@ ssize_t cpu_show_spectre_v1(struct devic { return sprintf(buf, "Mitigation: __user pointer sanitization\n"); } + +ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, + char *buf) +{ + if (__spectrev2_safe) + return sprintf(buf, "Not affected\n"); + + if (__hardenbp_enab) + return sprintf(buf, "Mitigation: Branch predictor hardening\n"); + + return sprintf(buf, "Vulnerable\n"); +}