From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-678564-1519839634-2-4517764752476904058 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='uk', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519839633; b=nLZ7GjjdFU6l2ix38/xNTJQOf8q8i8zk/9x+/tKZlPbJrkK Q1c+Of/ecAlPvEt54rw8iy0PYRq4/SPOw84tUQNYIyraFjt3Pj5nX9aUpwN/uxoh JLX9qEcLT0cZWSGnVW+RB+tgdMLeDtlw2M7v+8GX5V8N5YegG+p/o7m4WYfNFO1d WEQejYQtCkIXVTSxIy1UvZCae1prOWlaggDj6GXvvJanMh5WsKTipOE36++CtsDx CrPzhWZUjd1y6lVDeXiopwzbvFq8x7/aXiJ9epLQ7lBDbQDzcTTetpafGlIhS9ET y6eHp607qPewZqSipmqgQ3DBbUITedtaUvO0vTg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:content-transfer-encoding :mime-version:from:to:cc:date:message-id:subject:in-reply-to :sender:list-id; s=arctest; t=1519839633; bh=jJ3LZNSJ6nyY9MON/LQ 9vBoWnoM6mFaQVzKBRvzfcpY=; b=iEOcA85eGG/mEACmKR0N5Enbq+BQbSbWHPL SZ1Vj/U7Ikpq7vTVce1RMGN+eJElMnHRoNp15ST9Qsi6j3gSkfOTFJv6GPqF1tWt hCXPMG0sXrvBad8wXoIt6MKHMVEWygHyZAVkknY6Xc3V2zR0zflkLXgdu01vlGVD ok3HpgObSlF5QHRiPFUS2Ul93RoSjpDuxXlV39CYEJ+j8urgRq52IhZ+U0HJOOGi p2tP7YmuEa+/a0lm8yQ9eh2XwEiYB6o/hr03CEx9HyLIvgivOKmC9a7NmnBkii6J Nq3okUpd5IMcyPilDxUMbyAI9bt00g15Ymw1vn5Zc8TmJkc3o1Q== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932474AbeB1Rjo (ORCPT ); Wed, 28 Feb 2018 12:39:44 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:33160 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932530AbeB1PWN (ORCPT ); Wed, 28 Feb 2018 10:22:13 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Borislav Petkov" , "David Woodhouse" , "Thomas Gleixner" Date: Wed, 28 Feb 2018 15:20:22 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 112/140] x86/mce: Make machine check speculation protected In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.2.100-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Gleixner commit 6f41c34d69eb005e7848716bbcafc979b35037d5 upstream. The machine check idtentry uses an indirect branch directly from the low level code. This evades the speculation protection. Replace it by a direct call into C code and issue the indirect call there so the compiler can apply the proper speculation protection. Signed-off-by: Thomas Gleixner Reviewed-by:Borislav Petkov Reviewed-by: David Woodhouse Niced-by: Peter Zijlstra Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801181626290.1847@nanos [bwh: Backported to 3.2: - Don't use dotraplinkage - Adjust filename, context] Signed-off-by: Ben Hutchings --- arch/x86/include/asm/traps.h | 1 + arch/x86/kernel/cpu/mcheck/mce.c | 5 +++++ arch/x86/kernel/entry_64.S | 2 +- 3 files changed, 7 insertions(+), 1 deletion(-) --- a/arch/x86/include/asm/traps.h +++ b/arch/x86/include/asm/traps.h @@ -69,6 +69,7 @@ dotraplinkage void do_simd_coprocessor_e #ifdef CONFIG_X86_32 dotraplinkage void do_iret_error(struct pt_regs *, long); #endif +void do_mce(struct pt_regs *, long); static inline int get_si_code(unsigned long condition) { --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -1407,6 +1407,11 @@ static void unexpected_machine_check(str void (*machine_check_vector)(struct pt_regs *, long error_code) = unexpected_machine_check; +void do_mce(struct pt_regs *regs, long error_code) +{ + machine_check_vector(regs, error_code); +} + /* * Called for each booted CPU to set up machine checks. * Must be called with preempt off: --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1399,7 +1399,7 @@ errorentry page_fault do_page_fault errorentry async_page_fault do_async_page_fault #endif #ifdef CONFIG_X86_MCE -paranoidzeroentry machine_check *machine_check_vector(%rip) +paranoidzeroentry machine_check do_mce #endif /*