51 lines
1.5 KiB
Diff
51 lines
1.5 KiB
Diff
From 872fc04ecd90e0ca4d8ac4565b3a9f246c070873 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 19:51:35 +0300
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Subject: [PATCH] pl022: fix buffer overun on invalid state load
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CVE-2013-4530
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pl022.c did not bounds check tx_fifo_head and
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rx_fifo_head after loading them from file and
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before they are used to dereference array.
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Reported-by: Michael S. Tsirkin <mst@redhat.com
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Reported-by: Anthony Liguori <anthony@codemonkey.ws>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit d8d0a0bc7e194300e53a346d25fe5724fd588387)
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---
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hw/ssi/pl022.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/hw/ssi/pl022.c b/hw/ssi/pl022.c
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index fd479ef..b19bc71 100644
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--- a/hw/ssi/pl022.c
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+++ b/hw/ssi/pl022.c
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@@ -240,11 +240,25 @@ static const MemoryRegionOps pl022_ops = {
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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+static int pl022_post_load(void *opaque, int version_id)
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+{
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+ PL022State *s = opaque;
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+
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+ if (s->tx_fifo_head < 0 ||
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+ s->tx_fifo_head >= ARRAY_SIZE(s->tx_fifo) ||
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+ s->rx_fifo_head < 0 ||
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+ s->rx_fifo_head >= ARRAY_SIZE(s->rx_fifo)) {
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+ return -1;
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+ }
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+ return 0;
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+}
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+
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static const VMStateDescription vmstate_pl022 = {
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.name = "pl022_ssp",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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+ .post_load = pl022_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(cr0, PL022State),
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VMSTATE_UINT32(cr1, PL022State),
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