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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 37A24C4361B for ; Fri, 18 Dec 2020 11:17:12 +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 9DAE3233E2 for ; Fri, 18 Dec 2020 11:17:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9DAE3233E2 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]:38618 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqDl0-0004p6-NB for qemu-devel@archiver.kernel.org; Fri, 18 Dec 2020 06:17:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52322) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqDZ9-0006EC-OL for qemu-devel@nongnu.org; Fri, 18 Dec 2020 06:04:55 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:34224) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kqDZ6-0003cl-8v for qemu-devel@nongnu.org; Fri, 18 Dec 2020 06:04:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608289491; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=376jLot6ICkh+Oi/lgzPdEAsdFS+rwQIi8tE0SRyz78=; b=OpNccHAF1L5oA/qIyOjQIcgVoq42PAuxPeqmsxcapq0pcVk7SPafUDGw6XXbBjmo7ImEkM B7umgfYF+uvi0AsyyGJQXxGh6E1P7bkI2/gzOkAi7WdWBXZaxcQhvUFZTQ/X3SnaxtH53b sa0q9U/h/GIZlPouR9iNQljpBBNQSsU= 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-308-xj9C8lAGP-Sdm_VsmNKiNQ-1; Fri, 18 Dec 2020 06:04:49 -0500 X-MC-Unique: xj9C8lAGP-Sdm_VsmNKiNQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0064659; Fri, 18 Dec 2020 11:04:48 +0000 (UTC) Received: from gondolin (ovpn-113-130.ams2.redhat.com [10.36.113.130]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1AB8118993; Fri, 18 Dec 2020 11:04:42 +0000 (UTC) Date: Fri, 18 Dec 2020 12:04:40 +0100 From: Cornelia Huck To: Pierre Morel Subject: Re: [PATCH v2 2/2] s390x/pci: Fix memory_region_access_valid call Message-ID: <20201218120440.36b56e80.cohuck@redhat.com> In-Reply-To: <72f4e03f-7208-6af0-4cd2-9715d9f9ec77@linux.ibm.com> References: <1608243397-29428-1-git-send-email-mjrosato@linux.ibm.com> <1608243397-29428-3-git-send-email-mjrosato@linux.ibm.com> <72f4e03f-7208-6af0-4cd2-9715d9f9ec77@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=cohuck@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: , Cc: thuth@redhat.com, Matthew Rosato , david@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org, pasic@linux.ibm.com, borntraeger@de.ibm.com, qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 18 Dec 2020 10:37:38 +0100 Pierre Morel wrote: > On 12/17/20 11:16 PM, Matthew Rosato wrote: > > In pcistb_service_handler, a call is made to validate that the memory > > region can be accessed. However, the call is made using the entire length > > of the pcistb operation, which can be larger than the allowed memory > > access size (8). Since we already know that the provided buffer is a > > multiple of 8, fix the call to memory_region_access_valid to iterate > > over the memory region in the same way as the subsequent call to > > memory_region_dispatch_write. > > > > Fixes: 863f6f52b7 ("s390: implement pci instructions") > > Signed-off-by: Matthew Rosato > > --- > > hw/s390x/s390-pci-inst.c | 10 ++++++---- > > 1 file changed, 6 insertions(+), 4 deletions(-) > > > > diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c > > index e230293..76b08a3 100644 > > --- a/hw/s390x/s390-pci-inst.c > > +++ b/hw/s390x/s390-pci-inst.c > > @@ -821,10 +821,12 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr, > > mr = s390_get_subregion(mr, offset, len); > > offset -= mr->addr; > > > > - if (!memory_region_access_valid(mr, offset, len, true, > > - MEMTXATTRS_UNSPECIFIED)) { > > - s390_program_interrupt(env, PGM_OPERAND, ra); > > - return 0; > > + for (i = 0; i < len; i += 8) { > > + if (!memory_region_access_valid(mr, offset + i, 8, true, > > + MEMTXATTRS_UNSPECIFIED)) { > > + s390_program_interrupt(env, PGM_OPERAND, ra); > > + return 0; > > + } > > } > > > > if (s390_cpu_virt_mem_read(cpu, gaddr, ar, buffer, len)) { > > > > wouldn't it be made automatically by defining the io_region > max_access_size when reading the bars in clp_service_call? > But that's already what is happening, isn't it? The access check is done for a size that is potentially too large, while the actual access will happen in chunks of 8? I think that this patch is correct.