diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2014-04-03 19:51:23 +0300 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2014-05-05 22:15:02 +0200 |
| commit | 3f1c49e2136fa08ab1ef3183fd55def308829584 (patch) | |
| tree | 01e28bcbada1f1a759655926234448b5c6d8d0b0 | |
| parent | ae2158ad6ce0845b2fae2a22aa7f19c0d7a71ce5 (diff) | |
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>
| -rw-r--r-- | hw/timer/hpet.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c index e15d6bcac7..2792f89c66 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() |