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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 2935DC04EB9 for ; Mon, 3 Dec 2018 20:44:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE6D920850 for ; Mon, 3 Dec 2018 20:44:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DE6D920850 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726003AbeLCUoU (ORCPT ); Mon, 3 Dec 2018 15:44:20 -0500 Received: from mga04.intel.com ([192.55.52.120]:44076 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725923AbeLCUoT (ORCPT ); Mon, 3 Dec 2018 15:44:19 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Dec 2018 12:44:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,311,1539673200"; d="scan'208";a="126741549" Received: from jsakkine-mobl1.jf.intel.com (HELO localhost) ([10.24.10.74]) by fmsmga001.fm.intel.com with ESMTP; 03 Dec 2018 12:44:19 -0800 From: Jarkko Sakkinen To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, Jarkko Sakkinen , Dave Hansen Subject: [PATCH] x86/mpx: pass 'mm' to kernel_managing_mpx_tables() in mpx_notify_unmap() Date: Mon, 3 Dec 2018 12:43:57 -0800 Message-Id: <20181203204357.26209-1-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If mm is not the same as current->mm, mpx_notify_unmap() will yield invalid results and at worst will lead to a crash if it gets called by a kthread. Cc: Dave Hansen Fixes: 1de4fa14ee25 ("x86, mpx: Cleanup unused bound tables") Signed-off-by: Jarkko Sakkinen --- arch/x86/mm/mpx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c index 2385538e8065..15fb62657ee9 100644 --- a/arch/x86/mm/mpx.c +++ b/arch/x86/mm/mpx.c @@ -882,7 +882,7 @@ static int mpx_unmap_tables(struct mm_struct *mm, * necessary, and the 'vma' is the first vma in this range (start -> end). */ void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long start, unsigned long end) + unsigned long start, unsigned long end) { int ret; @@ -890,7 +890,7 @@ void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma, * Refuse to do anything unless userspace has asked * the kernel to help manage the bounds tables, */ - if (!kernel_managing_mpx_tables(current->mm)) + if (!kernel_managing_mpx_tables(mm)) return; /* * This will look across the entire 'start -> end' range, -- 2.19.1