From nobody Thu May 15 21:27:42 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; envelope-from=libvir-list-bounces@redhat.com; helo=mx1.redhat.com; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=libvir-list-bounces@redhat.com Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by mx.zohomail.com with SMTPS id 1505811676716145.08543483515086; Tue, 19 Sep 2017 02:01:16 -0700 (PDT) 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 mx1.redhat.com (Postfix) with ESMTPS id 49F0C267F5; Tue, 19 Sep 2017 09:01:15 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EECCA60466; Tue, 19 Sep 2017 09:01:14 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 172181806104; Tue, 19 Sep 2017 09:01:14 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id v8J86mEf013192 for ; Tue, 19 Sep 2017 04:06:48 -0400 Received: by smtp.corp.redhat.com (Postfix) id 124B61963A; Tue, 19 Sep 2017 08:06:48 +0000 (UTC) Received: from angien.brq.redhat.com (unknown [10.43.2.136]) by smtp.corp.redhat.com (Postfix) with ESMTP id 646E860466; Tue, 19 Sep 2017 08:06:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 49F0C267F5 Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=libvir-list-bounces@redhat.com From: Peter Krempa To: libvir-list@redhat.com Date: Tue, 19 Sep 2017 10:06:38 +0200 Message-Id: <1d0605813fad5573d3ec0fc7ccceafe57739439a.1505808295.git.pkrempa@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-loop: libvir-list@redhat.com Cc: Peter Krempa Subject: [libvirt] [PATCH v2 2/2] qemu: blockPeek: Enforce buffer filling X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 19 Sep 2017 09:01:16 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Documentation states: "'offset' and 'size' represent an area which must lie entirely within the device or file." Enforce the that the buffer lies within fully. --- src/qemu/qemu_driver.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 3109f8a17..bddba6b71 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -11416,6 +11416,7 @@ qemuDomainBlockPeek(virDomainPtr dom, virDomainDiskDefPtr disk =3D NULL; virDomainObjPtr vm; char *tmpbuf =3D NULL; + ssize_t nread; int ret =3D -1; virCheckFlags(0, -1); @@ -11442,9 +11443,16 @@ qemuDomainBlockPeek(virDomainPtr dom, if (qemuDomainStorageFileInit(driver, vm, disk->src) < 0) goto cleanup; - if (virStorageFileRead(disk->src, offset, size, &tmpbuf) < 0) + if ((nread =3D virStorageFileRead(disk->src, offset, size, &tmpbuf)) <= 0) goto cleanup; + if (nread < size) { + virReportError(VIR_ERR_INVALID_ARG, + _("'%s' starting from %llu has only %zd bytes avail= able"), + path, offset, nread); + goto cleanup; + } + memcpy(buffer, tmpbuf, size); ret =3D 0; --=20 2.14.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list