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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,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 72E20C07E85 for ; Tue, 4 Dec 2018 13:27:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 36B162081C for ; Tue, 4 Dec 2018 13:27:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=agner.ch header.i=@agner.ch header.b="Z3VQ61Cd" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 36B162081C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=agner.ch 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 S1726384AbeLDN1i (ORCPT ); Tue, 4 Dec 2018 08:27:38 -0500 Received: from mail.kmu-office.ch ([178.209.48.109]:33624 "EHLO mail.kmu-office.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725863AbeLDN1i (ORCPT ); Tue, 4 Dec 2018 08:27:38 -0500 Received: from trochilidae.toradex.int (unknown [46.140.72.82]) by mail.kmu-office.ch (Postfix) with ESMTPSA id 841245C03A3; Tue, 4 Dec 2018 14:27:36 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=agner.ch; s=dkim; t=1543930056; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references; bh=l/NqMlMJK6NCuID2vd75UkjcijsChz0PXtxpAkinb6A=; b=Z3VQ61CdqWFgxFzEkOjzTmIHpJ5Jv61kLXyp523WCTiAT2fVLCgnemUzqQIYMSf+Amqhfy 7wEWsStTzS9y4ABLxwtVEPxzx8FobRfn6j0WjCGSbwERljOgkaPhpkmtMJMzBQeRmP3o2Z 4QT3l+tHjscUfGZwK35zGspSrtLyZRE= From: Stefan Agner To: hongxing.zhu@nxp.com, l.stach@pengutronix.de Cc: robin.murphy@arm.com, tpiepho@impinj.com, linux@armlinux.org.uk, leonard.crestez@nxp.com, andrew.smirnov@gmail.com, festevam@gmail.com, lorenzo.pieralisi@arm.com, bhelgaas@google.com, stefan@agner.ch, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] pci: imx6: avoid dereferencing program counter from user mode Date: Tue, 4 Dec 2018 14:27:32 +0100 Message-Id: <20181204132733.14422-1-stefan@agner.ch> 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 The custom fault handler is currently only meant to handle kernel mode bus faults. Exit in case the abort happened in user mode. Signed-off-by: Stefan Agner --- drivers/pci/controller/dwc/pci-imx6.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 69f86234f7c0..54a29e441303 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -270,8 +270,14 @@ static int imx6q_pcie_abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { unsigned long pc = instruction_pointer(regs); - unsigned long instr = *(unsigned long *)pc; - int reg = (instr >> 12) & 15; + unsigned long instr; + int reg; + + if (user_mode(regs)) + return 1; + + instr = *(unsigned long *)pc; + reg = (instr >> 12) & 15; /* * If the instruction being executed was a read, -- 2.19.1