From owner-freebsd-bugs@FreeBSD.ORG Thu Jul 14 00:50:09 2011 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 43CB11065670 for ; Thu, 14 Jul 2011 00:50:09 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 080EF8FC15 for ; Thu, 14 Jul 2011 00:50:09 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id p6E0o87F058614 for ; Thu, 14 Jul 2011 00:50:08 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id p6E0o8HI058613; Thu, 14 Jul 2011 00:50:08 GMT (envelope-from gnats) Resent-Date: Thu, 14 Jul 2011 00:50:08 GMT Resent-Message-Id: <201107140050.p6E0o8HI058613@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Guy Harris Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1526E106566C for ; Thu, 14 Jul 2011 00:48:38 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from red.freebsd.org (red.freebsd.org [IPv6:2001:4f8:fff6::22]) by mx1.freebsd.org (Postfix) with ESMTP id C11448FC12 for ; Thu, 14 Jul 2011 00:48:37 +0000 (UTC) Received: from red.freebsd.org (localhost [127.0.0.1]) by red.freebsd.org (8.14.4/8.14.4) with ESMTP id p6E0mbHo081960 for ; Thu, 14 Jul 2011 00:48:37 GMT (envelope-from nobody@red.freebsd.org) Received: (from nobody@localhost) by red.freebsd.org (8.14.4/8.14.4/Submit) id p6E0mbiT081959; Thu, 14 Jul 2011 00:48:37 GMT (envelope-from nobody) Message-Id: <201107140048.p6E0mbiT081959@red.freebsd.org> Date: Thu, 14 Jul 2011 00:48:37 GMT From: Guy Harris To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/158880: bpf_filter() can leak kernel stack contents X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Jul 2011 00:50:09 -0000 >Number: 158880 >Category: kern >Synopsis: bpf_filter() can leak kernel stack contents >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Jul 14 00:50:08 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Guy Harris >Release: Any >Organization: >Environment: N/A (problem found by looking at OpenBSD's source repository) >Description: http://seclists.org/fulldisclosure/2010/Nov/89 That's Linux's BPF interpreter, but the same problem exists with the *BSD BPF interpreter: http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/bpf_filter.c.diff?r1=1.21;r2=1.22 http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/bpf_filter.c?rev=1.22;content-type=text%2Fx-cvsweb-markup >How-To-Repeat: A little more work, as BSD's BPF interpreter isn't supported on arbitrary sockets, just on BPF devices, but you could probably try to cook something interesting up. >Fix: Add a bzero() or memset(..., 0, ...) to zero out the men array early in bpf_filter(). >Release-Note: >Audit-Trail: >Unformatted: