diff options
| author |   Andres Beltran <lkmlabelt@gmail.com> | 2021-04-08 18:14:39 +0200 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2021-05-14 17:37:46 +0000 |
| commit | adae1e931acd8b430d31141a283ea06d4b705417 (patch) | |
| tree | 70799e7f212ce0f991b0a675625391b8adf606f3 /drivers/net/hyperv/rndis_filter.c | |
| parent | hv_balloon: Remove redundant assignment to region_start (diff) | |
| download | wireguard-linux-adae1e931acd8b430d31141a283ea06d4b705417.tar.xz wireguard-linux-adae1e931acd8b430d31141a283ea06d4b705417.zip | |
Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer
Pointers to ring-buffer packets sent by Hyper-V are used within the
guest VM. Hyper-V can send packets with erroneous values or modify
packet fields after they are processed by the guest. To defend
against these scenarios, return a copy of the incoming VMBus packet
after validating its length and offset fields in hv_pkt_iter_first().
In this way, the packet can no longer be modified by the host.
Signed-off-by: Andres Beltran <lkmlabelt@gmail.com>
Co-developed-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20210408161439.341988-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/net/hyperv/rndis_filter.c')
| -rw-r--r-- | drivers/net/hyperv/rndis_filter.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index c0e89e107d57..d7ff9ddcbae2 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -1260,6 +1260,8 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc) nvchan->channel = new_sc; new_sc->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes); + new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE; + ret = vmbus_open(new_sc, netvsc_ring_bytes, netvsc_ring_bytes, NULL, 0, netvsc_channel_cb, nvchan); |