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Re: [Qemu-devel] [PATCH v2] hostmem: Validate host-nodes before setting
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH v2] hostmem: Validate host-nodes before setting bitmap |
Date: |
Tue, 4 Dec 2018 14:29:01 +0100 |
On Fri, 30 Nov 2018 10:28:44 -0200
Eduardo Habkost <address@hidden> 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 <address@hidden>
> Signed-off-by: Eduardo Habkost <address@hidden>
Reviewed-by: Igor Mammedov <address@hidden>
> ---
> 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 <address@hidden>
> +#
> +# 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)
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