From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3sRrKV25b4zDrvZ for ; Sun, 4 Sep 2016 21:31:25 +1000 (AEST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u84BN9Ib088412 for ; Sun, 4 Sep 2016 07:31:23 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0b-001b2d01.pphosted.com with ESMTP id 258c4tt82a-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Sun, 04 Sep 2016 07:31:23 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 4 Sep 2016 05:31:22 -0600 From: "Aneesh Kumar K.V" To: Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 1/3] powerpc/mm: Don't alias user region to other regions below PAGE_OFFSET In-Reply-To: <20160903095413.GA868@fergus.ozlabs.ibm.com> References: <20160902114759.GA12433@fergus.ozlabs.ibm.com> <87vayeqyo7.fsf@linux.vnet.ibm.com> <20160903095413.GA868@fergus.ozlabs.ibm.com> Date: Sun, 04 Sep 2016 17:01:17 +0530 MIME-Version: 1.0 Content-Type: text/plain Message-Id: <87h99vrjei.fsf@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Paul Mackerras writes: > On Fri, Sep 02, 2016 at 05:52:16PM +0530, Aneesh Kumar K.V wrote: >> >> Hi Paul, >> >> Really nice catch. Was this found by code analysis or do we have any >> reported issue around this ? > > I found it by code analysis. > > I haven't been able to find any really bad consequence, beyond leaking > some information about kernel memory. Can you find any worse > consequence? > No, considering linux page table entry is not going to have a mapping for this address. -aneesh