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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 CE57DC282CE for ; Mon, 11 Feb 2019 15:59:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A0692218D8 for ; Mon, 11 Feb 2019 15:59:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549900751; bh=oGg5iQVgAh9anK6wyEm98yTwIRFqFSuqdZaexuZLnA4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rezU+bocV7fkIphWAJ1ZP4pLgzaUG0b+KJFKfAtNK2ihkGrWhGBylMEhiHlCiyc9R d+9cCC2zBmdPlgJRxPoc57xmGU39GZe0Tqa9ZIX7iu3dNVd2JFIZdyBigur9SEOfZG wAetF9qq4N+MmC3qHPEFh7TZXLSzNRXY8CP4K+VI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729901AbfBKP67 (ORCPT ); Mon, 11 Feb 2019 10:58:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:39978 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730194AbfBKOcd (ORCPT ); Mon, 11 Feb 2019 09:32:33 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (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 E4B4D20844; Mon, 11 Feb 2019 14:32:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895552; bh=oGg5iQVgAh9anK6wyEm98yTwIRFqFSuqdZaexuZLnA4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bA6ji38ShWkrJmeMyyZxkzcqyJoQpmUP6ZEeqaOoUpXlX6otSzx+iQ2bdHw+vClCU pALqUgz00eU/dhe1GCL70M0JNWA46zp84X/x37sN7iztza8JumPlNIHf1GGeEOqWBd E4rhQITKRDcoTp1N5lV4kTefo+oALx1Rfyfiw0M8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe Leroy , Michael Ellerman , Sasha Levin Subject: [PATCH 4.20 241/352] powerpc/mm: Fix reporting of kernel execute faults on the 8xx Date: Mon, 11 Feb 2019 15:17:48 +0100 Message-Id: <20190211141902.496412047@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit ffca395b11c4a5a6df6d6345f794b0e3d578e2d0 ] On the 8xx, no-execute is set via PPP bits in the PTE. Therefore a no-exec fault generates DSISR_PROTFAULT error bits, not DSISR_NOEXEC_OR_G. This patch adds DSISR_PROTFAULT in the test mask. Fixes: d3ca587404b3 ("powerpc/mm: Fix reporting of kernel execute faults") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 1697e903bbf2..50e5c790d11e 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -226,7 +226,9 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, static bool bad_kernel_fault(bool is_exec, unsigned long error_code, unsigned long address) { - if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT))) { + /* NX faults set DSISR_PROTFAULT on the 8xx, DSISR_NOEXEC_OR_G on others */ + if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT | + DSISR_PROTFAULT))) { printk_ratelimited(KERN_CRIT "kernel tried to execute" " exec-protected page (%lx) -" "exploit attempt? (uid: %d)\n", -- 2.19.1