From: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> Sent: Tuesday, June 30, 2020 10:16 AM > > On Tue, 30 Jun 2020 11:31:57 -0400 > Andres Beltran <lkmlabelt@xxxxxxxxx> wrote: > > > Currently, VMbus drivers use pointers into guest memory as request IDs > > for interactions with Hyper-V. To be more robust in the face of errors > > or malicious behavior from a compromised Hyper-V, avoid exposing > > guest memory addresses to Hyper-V. Also avoid Hyper-V giving back a > > bad request ID that is then treated as the address of a guest data > > structure with no validation. Instead, encapsulate these memory > > addresses and provide small integers as request IDs. > > > > The first patch creates the definitions for the data structure, provides > > helper methods to generate new IDs and retrieve data, and > > allocates/frees the memory needed for vmbus_requestor. > > > > The second and third patches make use of vmbus_requestor to send request > > IDs to Hyper-V in storvsc and netvsc respectively. > > > > Thanks. > > Andres Beltran > > > > Tested-by: Andrea Parri <parri.andrea@xxxxxxxxx> > > > > Cc: linux-scsi@xxxxxxxxxxxxxxx > > Cc: netdev@xxxxxxxxxxxxxxx > > Cc: James E.J. Bottomley <jejb@xxxxxxxxxxxxx> > > Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx> > > Cc: David S. Miller <davem@xxxxxxxxxxxxx> > > > > Andres Beltran (3): > > Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus > > hardening > > scsi: storvsc: Use vmbus_requestor to generate transaction IDs for > > VMBus hardening > > hv_netvsc: Use vmbus_requestor to generate transaction IDs for VMBus > > hardening > > > > drivers/hv/channel.c | 154 ++++++++++++++++++++++++++++++ > > drivers/net/hyperv/hyperv_net.h | 13 +++ > > drivers/net/hyperv/netvsc.c | 79 ++++++++++++--- > > drivers/net/hyperv/rndis_filter.c | 1 + > > drivers/scsi/storvsc_drv.c | 85 ++++++++++++++--- > > include/linux/hyperv.h | 22 +++++ > > 6 files changed, 329 insertions(+), 25 deletions(-) > > > > How does this interact with use of the vmbus in usermode by DPDK through > hv_uio_generic? > Will it still work? This new mechanism for generating requestIDs to pass to Hyper-V is available for VMbus drivers to use, but drivers that have not been updated to use it are unaffected. So hv_uio_generic will work as it always has. Michael
