Update qemu package to mitigate CVE-2015-3456
[packages/centos6/qemu.git] / 0009-hw-pci-pcie_aer.c-fix-buffer-overruns-on-invalid-sta.patch
1 From b6f53085cc618bc7e58be702afacad1b5dcae5ba Mon Sep 17 00:00:00 2001
2 From: "Michael S. Tsirkin" <mst@redhat.com>
3 Date: Thu, 3 Apr 2014 19:51:31 +0300
4 Subject: [PATCH] hw/pci/pcie_aer.c: fix buffer overruns on invalid state load
5
6 4) CVE-2013-4529
7 hw/pci/pcie_aer.c    pcie aer log can overrun the buffer if log_num is
8                      too large
9
10 There are two issues in this file:
11 1. log_max from remote can be larger than on local
12 then buffer will overrun with data coming from state file.
13 2. log_num can be larger then we get data corruption
14 again with an overflow but not adversary controlled.
15
16 Fix both issues.
17
18 Reported-by: Anthony Liguori <anthony@codemonkey.ws>
19 Reported-by: Michael S. Tsirkin <mst@redhat.com>
20 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
21 Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
22 Signed-off-by: Juan Quintela <quintela@redhat.com>
23 (cherry picked from commit 5f691ff91d323b6f97c6600405a7f9dc115a0ad1)
24 ---
25  hw/pci/pcie_aer.c | 10 +++++++++-
26  1 file changed, 9 insertions(+), 1 deletion(-)
27
28 diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
29 index 991502e..535be2c 100644
30 --- a/hw/pci/pcie_aer.c
31 +++ b/hw/pci/pcie_aer.c
32 @@ -795,6 +795,13 @@ static const VMStateDescription vmstate_pcie_aer_err = {
33      }
34  };
35  
36 +static bool pcie_aer_state_log_num_valid(void *opaque, int version_id)
37 +{
38 +    PCIEAERLog *s = opaque;
39 +
40 +    return s->log_num <= s->log_max;
41 +}
42 +
43  const VMStateDescription vmstate_pcie_aer_log = {
44      .name = "PCIE_AER_ERROR_LOG",
45      .version_id = 1,
46 @@ -802,7 +809,8 @@ const VMStateDescription vmstate_pcie_aer_log = {
47      .minimum_version_id_old = 1,
48      .fields     = (VMStateField[]) {
49          VMSTATE_UINT16(log_num, PCIEAERLog),
50 -        VMSTATE_UINT16(log_max, PCIEAERLog),
51 +        VMSTATE_UINT16_EQUAL(log_max, PCIEAERLog),
52 +        VMSTATE_VALIDATE("log_num <= log_max", pcie_aer_state_log_num_valid),
53          VMSTATE_STRUCT_VARRAY_POINTER_UINT16(log, PCIEAERLog, log_num,
54                                vmstate_pcie_aer_err, PCIEAERErr),
55          VMSTATE_END_OF_LIST()