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vmxnet3: validate queues configuration coming from guest 

CVE-2013-4544

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
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>
Message-id: 1396604722-11902-3-git-send-email-dmitry@daynix.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Dmitry Fleytman 2014-04-04 12:45:20 +03:00 committed by Peter Maydell
parent 8c6c047899
commit 9878d173f5
1 changed files with 18 additions and 1 deletions
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19
hw/net/vmxnet3.c
View File

@ -1336,6 +1336,23 @@ static void vmxnet3_validate_interrupts(VMXNET3State *s)
}
}
static void vmxnet3_validate_queues(VMXNET3State *s)
{
/*
* txq_num and rxq_num are total number of queues
* configured by guest. These numbers must not
* exceed corresponding maximal values.
*/
if (s->txq_num > VMXNET3_DEVICE_MAX_TX_QUEUES) {
hw_error("Bad TX queues number: %d\n", s->txq_num);
}
if (s->rxq_num > VMXNET3_DEVICE_MAX_RX_QUEUES) {
hw_error("Bad RX queues number: %d\n", s->rxq_num);
}
}
static void vmxnet3_activate_device(VMXNET3State *s)
{
int i;
@ -1382,7 +1399,7 @@ static void vmxnet3_activate_device(VMXNET3State *s)
VMXNET3_READ_DRV_SHARED8(s->drv_shmem, devRead.misc.numRxQueues);
VMW_CFPRN("Number of TX/RX queues %u/%u", s->txq_num, s->rxq_num);
assert(s->txq_num <= VMXNET3_DEVICE_MAX_TX_QUEUES);
vmxnet3_validate_queues(s);
qdescr_table_pa =
VMXNET3_READ_DRV_SHARED64(s->drv_shmem, devRead.misc.queueDescPA);