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=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 F2CABC433DF for ; Thu, 4 Jun 2020 08:44:20 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BDFF720738 for ; Thu, 4 Jun 2020 08:44:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AdHA0FZD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BDFF720738 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:51208 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jglU3-000398-W9 for qemu-devel@archiver.kernel.org; Thu, 04 Jun 2020 04:44:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50982) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jglTW-0002hw-Gn for qemu-devel@nongnu.org; Thu, 04 Jun 2020 04:43:46 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:60026 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jglTU-0008Bl-OH for qemu-devel@nongnu.org; Thu, 04 Jun 2020 04:43:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591260223; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=nwrLxNpgtcUzKmaKLV2ZZwRVkV2T9CtIZutZAP8mSYI=; b=AdHA0FZDG+nrytLX6bzmQN/ozgEKhNfN0Mhusvgf7Deqj8s0yVL/nua3/zYMhXbAGUwDyv EbN+BGUMoaqd5LEcCrWUlMBbdV5hXI0RU9FP5Q0irGB9sVGB/a/l9lLcTjK2jBs3HvMydt y9XZAK8EWeR7VsZupVVWvlGJkLS/7PU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-324-hN2BkNh9O6SGnZR9262l-w-1; Thu, 04 Jun 2020 04:43:31 -0400 X-MC-Unique: hN2BkNh9O6SGnZR9262l-w-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D1B29800C78; Thu, 4 Jun 2020 08:43:29 +0000 (UTC) Received: from redhat.com (unknown [10.36.110.64]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9799C6111F; Thu, 4 Jun 2020 08:43:21 +0000 (UTC) Date: Thu, 4 Jun 2020 09:43:18 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: P J P Subject: Re: [PATCH v2 1/2] ait-vga: check address before reading configuration bytes Message-ID: <20200604084318.GA3050580@redhat.com> References: <20200603202251.1199170-1-ppandit@redhat.com> <20200603202251.1199170-2-ppandit@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200603202251.1199170-2-ppandit@redhat.com> User-Agent: Mutt/1.13.4 (2020-02-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.120; envelope-from=berrange@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/04 01:12:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FROM_EXCESS_BASE64=0.979, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Prasad J Pandit , "Michael S . Tsirkin" , Yi Ren , QEMU Developers , Gerd Hoffmann , Ren Ding , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Hanqing Zhao Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Typo: s/ait/ati/ On Thu, Jun 04, 2020 at 01:52:50AM +0530, P J P wrote: > From: Prasad J Pandit > > While reading PCI configuration bytes, a guest may send an > address towards the end of the configuration space. It may lead > to an OOB access issue. Add check to ensure 'address + size' is > within PCI configuration space. Please include a CVE number for this security flaw if there is one. > > Reported-by: Ren Ding > Reported-by: Hanqing Zhao > Reported-by: Yi Ren > Signed-off-by: Prasad J Pandit > --- > hw/display/ati.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > Update v2: add check to avoid OOB PCI configuration space access > -> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00711.html > > diff --git a/hw/display/ati.c b/hw/display/ati.c > index bda4a2d816..6671959e5d 100644 > --- a/hw/display/ati.c > +++ b/hw/display/ati.c > @@ -384,7 +384,10 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, unsigned int size) > val = s->regs.crtc_pitch; > break; > case 0xf00 ... 0xfff: > - val = pci_default_read_config(&s->dev, addr - 0xf00, size); > + addr = addr - 0xf00; > + if (addr + size <= 0xff) { > + val = pci_default_read_config(&s->dev, addr, size); > + } > break; > case CUR_OFFSET: > val = s->regs.cur_offset; > -- > 2.26.2 > Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|