From: "Michael S. Tsirkin" <m...@redhat.com> 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 <anth...@codemonkey.ws> Signed-off-by: Michael S. Tsirkin <m...@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com> Signed-off-by: Juan Quintela <quint...@redhat.com> (cherry picked from commit 3f1c49e2136fa08ab1ef3183fd55def308829584) Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com> --- hw/timer/hpet.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c index c6c2803..60892da 100644 --- a/hw/timer/hpet.c +++ b/hw/timer/hpet.c @@ -227,6 +227,18 @@ 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; @@ -295,6 +307,7 @@ 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() -- 1.9.1