From 9878d173f574df74bde0ff50b2f81009fbee81bb Mon Sep 17 00:00:00 2001 From: Dmitry Fleytman Date: Fri, 4 Apr 2014 12:45:20 +0300 Subject: vmxnet3: validate queues configuration coming from guest CVE-2013-4544 Signed-off-by: Dmitry Fleytman Reported-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Dr. David Alan Gilbert Message-id: 1396604722-11902-3-git-send-email-dmitry@daynix.com Signed-off-by: Peter Maydell --- hw/net/vmxnet3.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c index 0b317f83ff..4fefc7bb49 100644 --- a/hw/net/vmxnet3.c +++ b/hw/net/vmxnet3.c @@ -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); -- cgit v1.2.1