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From b6f53085cc618bc7e58be702afacad1b5dcae5ba Mon Sep 17 00:00:00 2001
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Date: Thu, 3 Apr 2014 19:51:31 +0300
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Subject: [PATCH] hw/pci/pcie_aer.c: fix buffer overruns on invalid state load
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4) CVE-2013-4529
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hw/pci/pcie_aer.c pcie aer log can overrun the buffer if log_num is
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too large
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There are two issues in this file:
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1. log_max from remote can be larger than on local
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then buffer will overrun with data coming from state file.
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2. log_num can be larger then we get data corruption
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again with an overflow but not adversary controlled.
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Fix both issues.
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Reported-by: Anthony Liguori <anthony@codemonkey.ws>
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Reported-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 5f691ff91d323b6f97c6600405a7f9dc115a0ad1)
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---
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hw/pci/pcie_aer.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
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index 991502e..535be2c 100644
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--- a/hw/pci/pcie_aer.c
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+++ b/hw/pci/pcie_aer.c
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@@ -795,6 +795,13 @@ static const VMStateDescription vmstate_pcie_aer_err = {
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}
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};
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+static bool pcie_aer_state_log_num_valid(void *opaque, int version_id)
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+{
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+ PCIEAERLog *s = opaque;
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+
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+ return s->log_num <= s->log_max;
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+}
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+
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const VMStateDescription vmstate_pcie_aer_log = {
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.name = "PCIE_AER_ERROR_LOG",
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.version_id = 1,
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@@ -802,7 +809,8 @@ const VMStateDescription vmstate_pcie_aer_log = {
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(log_num, PCIEAERLog),
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- VMSTATE_UINT16(log_max, PCIEAERLog),
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+ VMSTATE_UINT16_EQUAL(log_max, PCIEAERLog),
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+ VMSTATE_VALIDATE("log_num <= log_max", pcie_aer_state_log_num_valid),
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VMSTATE_STRUCT_VARRAY_POINTER_UINT16(log, PCIEAERLog, log_num,
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vmstate_pcie_aer_err, PCIEAERErr),
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VMSTATE_END_OF_LIST()
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