From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752302AbdKNGbF (ORCPT ); Tue, 14 Nov 2017 01:31:05 -0500 Received: from mga11.intel.com ([192.55.52.93]:18689 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751030AbdKNGa6 (ORCPT ); Tue, 14 Nov 2017 01:30:58 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,393,1505804400"; d="scan'208";a="149275340" From: Ricardo Neri To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" Cc: Borislav Petkov , Andy Lutomirski , Tony Luck , Paolo Bonzini , "Ravi V. Shankar" , x86@kernel.org, ricardo.neri@intel.com, linux-kernel@vger.kernel.org, Ricardo Neri Subject: [RESEND PATCH v2 0/4] x86: Tweaks for UMIP Date: Mon, 13 Nov 2017 22:29:41 -0800 Message-Id: <1510640985-18412-1-git-send-email-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [To tip maintainers: This is a resend to copy the Linux kernel mailing list. No changes in the patches since my original v2 submission.] Now that the support for UMIP [1], [2] has been merged in the tip tree, this series add a couple of tweaks. Ingo asked for two small additions to select UMIP by default when building and inform of this feature being enabled [3]. Also, Linus suggested to issue a rate-limited warning whenever the any of the instructions that UMIP protects are used by user space programs [4]. This is useful to give programs a hint on the reason for which they start seeing an unexpected SIGSEGV signal. Also, it helps to encourage updates to those programs and avoid using these instructions if possible. Thanks and BR, Ricardo [1]. https://lkml.org/lkml/2017/10/27/699 [2]. https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1523438.html [3]. https://lkml.org/lkml/2017/11/8/238 [4]. https://lkml.org/lkml/2017/11/8/593 Changes since V1: * Capitalize all the instructions' mnemonics in both code and patch descriptions. * Correct documentation of umip_pr_warn() to correctly reflect the function name. * Update description of patch #4 to describe the update to the existing rate-limited pr_err(). Ricardo Neri (4): x86/umip: Select X86_INTEL_UMIP by default x86/umip: Inform that UMIP has been enabled x86/umip: Identify the str and sldt instructions x86/umip: Warn if UMIP-protected instructions are used arch/x86/Kconfig | 10 ++++- arch/x86/kernel/cpu/common.c | 2 + arch/x86/kernel/umip.c | 88 +++++++++++++++++++++++++++++++++++++------- 3 files changed, 85 insertions(+), 15 deletions(-) -- 2.7.4