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authorMichael S. Tsirkin <mst@redhat.com>2014-04-03 19:52:13 +0300
committerJuan Quintela <quintela@redhat.com>2014-05-05 22:15:02 +0200
commit52f91c3723932f8340fe36c8ec8b18a757c37b2b (patch)
treef331a24f6d414648c3994cc0a25e3bc6ae3059e4 /hw
parent5193be3be35f29a35bc465036cd64ad60d43385f (diff)
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>
Diffstat (limited to 'hw')
-rw-r--r--hw/gpio/zaurus.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/hw/gpio/zaurus.c b/hw/gpio/zaurus.c
index dc79a8baa6..8e2ce049de 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),