From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57912) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gUAlX-0007OK-6V for qemu-devel@nongnu.org; Tue, 04 Dec 2018 08:29:32 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gUAlS-0000UE-9A for qemu-devel@nongnu.org; Tue, 04 Dec 2018 08:29:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35667) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gUAlR-0000Tc-UX for qemu-devel@nongnu.org; Tue, 04 Dec 2018 08:29:26 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D4728309D55C for ; Tue, 4 Dec 2018 13:29:24 +0000 (UTC) Date: Tue, 4 Dec 2018 14:29:01 +0100 From: Igor Mammedov Message-ID: <20181204142901.23c3f37c@redhat.com> In-Reply-To: <20181130122844.29103-1-ehabkost@redhat.com> References: <20181130122844.29103-1-ehabkost@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v2] hostmem: Validate host-nodes before setting bitmap List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eduardo Habkost Cc: qemu-devel@nongnu.org, David Hildenbrand , Markus Armbruster , Stefano Garzarella On Fri, 30 Nov 2018 10:28:44 -0200 Eduardo Habkost wrote: > host_memory_backend_set_host_nodes() was not validating > host-nodes before writing to backend->host_nodes, making QEMU > write beyond the end of the bitmap. > > Fix the crash and add a simple regression test for the fix. > > While at it, fix memory leak of the list returned by > visit_type_uint16List(). > > Reported-by: Markus Armbruster > Signed-off-by: Eduardo Habkost Reviewed-by: Igor Mammedov > --- > Changes v1 -> v2: > * Remove extra `l = l->next` statement > (reported by Stefano Garzarella) > * Fix (existing) leak of `host_nodes` > (reported by Markus Armbruster) > --- > backends/hostmem.c | 17 +++++++++---- > tests/acceptance/host-nodes-limit.py | 36 ++++++++++++++++++++++++++++ > 2 files changed, 49 insertions(+), 4 deletions(-) > create mode 100644 tests/acceptance/host-nodes-limit.py > > diff --git a/backends/hostmem.c b/backends/hostmem.c > index 1a89342039..af800284e0 100644 > --- a/backends/hostmem.c > +++ b/backends/hostmem.c > @@ -103,14 +103,23 @@ host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name, > { > #ifdef CONFIG_NUMA > HostMemoryBackend *backend = MEMORY_BACKEND(obj); > - uint16List *l = NULL; > + uint16List *l, *host_nodes = NULL; > > - visit_type_uint16List(v, name, &l, errp); > + visit_type_uint16List(v, name, &host_nodes, errp); > > - while (l) { > + for (l = host_nodes; l; l = l->next) { > + if (l->value >= MAX_NODES) { > + error_setg(errp, "Invalid host-nodes value: %d", l->value); > + goto out; > + } > + } > + > + for (l = host_nodes; l; l = l->next) { > bitmap_set(backend->host_nodes, l->value, 1); > - l = l->next; > } > + > +out: > + qapi_free_uint16List(host_nodes); > #else > error_setg(errp, "NUMA node binding are not supported by this QEMU"); > #endif > diff --git a/tests/acceptance/host-nodes-limit.py b/tests/acceptance/host-nodes-limit.py > new file mode 100644 > index 0000000000..e803e10104 > --- /dev/null > +++ b/tests/acceptance/host-nodes-limit.py > @@ -0,0 +1,36 @@ > +# Regression test for host-nodes limit validation > +# > +# Copyright (c) 2018 Red Hat, Inc. > +# > +# Author: > +# Eduardo Habkost > +# > +# This work is licensed under the terms of the GNU GPL, version 2 or > +# later. See the COPYING file in the top-level directory. > + > +from avocado_qemu import Test > +from subprocess import Popen, PIPE > + > +MAX_NODES = 128 > + > +class HostNodesValidation(Test): > + def test_large_host_nodes(self): > + p = Popen([self.qemu_bin, '-display', 'none', '-nodefaults', > + '-object', 'memory-backend-ram,id=m0,' > + 'size=4096,host-nodes=%d' % (MAX_NODES)], > + stderr=PIPE, stdout=PIPE) > + stdout,stderr = p.communicate() > + > + self.assertIn(b'Invalid host-nodes', stderr) > + self.assertEquals(stdout, b'') > + self.assertEquals(p.returncode, 1) > + > + def test_valid_host_nodes(self): > + p = Popen([self.qemu_bin, '-display', 'none', '-nodefaults', > + '-object', 'memory-backend-ram,id=m0,' > + 'size=4096,host-nodes=%d' % (MAX_NODES - 1)], > + stderr=PIPE, stdout=PIPE) > + stdout,stderr = p.communicate() > + > + self.assertIn(b'host-nodes must be empty', stderr) > + self.assertEquals(p.returncode, 1)