54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
From: "Michael S. Tsirkin" <mst@redhat.com>
|
|
Date: Thu, 3 Apr 2014 19:52:13 +0300
|
|
Subject: [PATCH] zaurus: fix buffer overrun on invalid state load
|
|
|
|
CVE-2013-4540
|
|
|
|
Within scoop_gpio_handler_update, if prev_level has a high bit set, then
|
|
we get bit > 16 and that causes a buffer overrun.
|
|
|
|
Since prev_level comes from wire indirectly, this can
|
|
happen on invalid state load.
|
|
|
|
Similarly for gpio_level and gpio_dir.
|
|
|
|
To fix, limit to 16 bit.
|
|
|
|
Reported-by: Michael S. Tsirkin <mst@redhat.com>
|
|
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 52f91c3723932f8340fe36c8ec8b18a757c37b2b)
|
|
---
|
|
hw/gpio/zaurus.c | 10 ++++++++++
|
|
1 file changed, 10 insertions(+)
|
|
|
|
diff --git a/hw/gpio/zaurus.c b/hw/gpio/zaurus.c
|
|
index dc79a8b..8e2ce04 100644
|
|
--- a/hw/gpio/zaurus.c
|
|
+++ b/hw/gpio/zaurus.c
|
|
@@ -203,6 +203,15 @@ static bool is_version_0 (void *opaque, int version_id)
|
|
return version_id == 0;
|
|
}
|
|
|
|
+static bool vmstate_scoop_validate(void *opaque, int version_id)
|
|
+{
|
|
+ ScoopInfo *s = opaque;
|
|
+
|
|
+ return !(s->prev_level & 0xffff0000) &&
|
|
+ !(s->gpio_level & 0xffff0000) &&
|
|
+ !(s->gpio_dir & 0xffff0000);
|
|
+}
|
|
+
|
|
static const VMStateDescription vmstate_scoop_regs = {
|
|
.name = "scoop",
|
|
.version_id = 1,
|
|
@@ -215,6 +224,7 @@ static const VMStateDescription vmstate_scoop_regs = {
|
|
VMSTATE_UINT32(gpio_level, ScoopInfo),
|
|
VMSTATE_UINT32(gpio_dir, ScoopInfo),
|
|
VMSTATE_UINT32(prev_level, ScoopInfo),
|
|
+ VMSTATE_VALIDATE("irq levels are 16 bit", vmstate_scoop_validate),
|
|
VMSTATE_UINT16(mcr, ScoopInfo),
|
|
VMSTATE_UINT16(cdr, ScoopInfo),
|
|
VMSTATE_UINT16(ccr, ScoopInfo),
|