52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
From 5e0e0a12887c9e70356c23d20b08b08eabd4a6df Mon Sep 17 00:00:00 2001
|
|
From: "Michael S. Tsirkin" <mst@redhat.com>
|
|
Date: Thu, 3 Apr 2014 19:51:23 +0300
|
|
Subject: [PATCH] hpet: fix buffer overrun on invalid state load
|
|
|
|
CVE-2013-4527 hw/timer/hpet.c buffer overrun
|
|
|
|
hpet is a VARRAY with a uint8 size but static array of 32
|
|
|
|
To fix, make sure num_timers is valid using VMSTATE_VALID hook.
|
|
|
|
Reported-by: Anthony Liguori <anthony@codemonkey.ws>
|
|
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
Signed-off-by: Juan Quintela <quintela@redhat.com>
|
|
(cherry picked from commit 3f1c49e2136fa08ab1ef3183fd55def308829584)
|
|
---
|
|
hw/timer/hpet.c | 13 +++++++++++++
|
|
1 file changed, 13 insertions(+)
|
|
|
|
diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
|
|
index e15d6bc..2792f89 100644
|
|
--- a/hw/timer/hpet.c
|
|
+++ b/hw/timer/hpet.c
|
|
@@ -239,6 +239,18 @@ static int hpet_pre_load(void *opaque)
|
|
return 0;
|
|
}
|
|
|
|
+static bool hpet_validate_num_timers(void *opaque, int version_id)
|
|
+{
|
|
+ HPETState *s = opaque;
|
|
+
|
|
+ if (s->num_timers < HPET_MIN_TIMERS) {
|
|
+ return false;
|
|
+ } else if (s->num_timers > HPET_MAX_TIMERS) {
|
|
+ return false;
|
|
+ }
|
|
+ return true;
|
|
+}
|
|
+
|
|
static int hpet_post_load(void *opaque, int version_id)
|
|
{
|
|
HPETState *s = opaque;
|
|
@@ -307,6 +319,7 @@ static const VMStateDescription vmstate_hpet = {
|
|
VMSTATE_UINT64(isr, HPETState),
|
|
VMSTATE_UINT64(hpet_counter, HPETState),
|
|
VMSTATE_UINT8_V(num_timers, HPETState, 2),
|
|
+ VMSTATE_VALIDATE("num_timers in range", hpet_validate_num_timers),
|
|
VMSTATE_STRUCT_VARRAY_UINT8(timer, HPETState, num_timers, 0,
|
|
vmstate_hpet_timer, HPETTimer),
|
|
VMSTATE_END_OF_LIST()
|