From owner-freebsd-bugs@FreeBSD.ORG  Wed Nov 12 22:17:35 2014
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 1196630F
 for <freebsd-bugs@FreeBSD.org>; Wed, 12 Nov 2014 22:17:35 +0000 (UTC)
Received: from kenobi.freebsd.org (kenobi.freebsd.org
 [IPv6:2001:1900:2254:206a::16:76])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id EDF72DA
 for <freebsd-bugs@FreeBSD.org>; Wed, 12 Nov 2014 22:17:34 +0000 (UTC)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id sACMHYk3024395
 for <freebsd-bugs@FreeBSD.org>; Wed, 12 Nov 2014 22:17:34 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-bugs@FreeBSD.org
Subject: [Bug 194974] New: Limit /dev/mem access to addresses in phys_avail[]
 - i.e. actual memory
Date: Wed, 12 Nov 2014 22:17:35 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.0-CURRENT
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: emaste@freebsd.org
X-Bugzilla-Status: Needs Triage
X-Bugzilla-Priority: ---
X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform
 op_sys bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-194974-8@https.bugs.freebsd.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 12 Nov 2014 22:17:35 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194974

            Bug ID: 194974
           Summary: Limit /dev/mem access to addresses in phys_avail[] -
                    i.e. actual memory
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

Running a mismatched lsof on my ~10.1 desktop resulted in an MCA report and
hard hang:

MCA: Bank 1, Status 0xbf80000000200001
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306a9, APIC ID 2
MCA: CPU 2 UNCOR PCC unclassified error
MCA: Address 0xfee00080
MCA: Misc 0x86
MCA: Bank 1, Status 0xbf80000000200001
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306a9, APIC ID 3
MCA: CPU 3 UNCOR PCC unclassified error
MCA: Address 0xfee00080
MCA: Misc 0x86

Discussed with jhb@, presumably this happens after access to some device
register. We should by default limit /dev/mem access to addresses in
phys_avail[], but include a sysctl to enable such access for expert debugging.

-- 
You are receiving this mail because:
You are the assignee for the bug.