diff options
| author | Andres Beltran <lkmlabelt@gmail.com> | 2020-11-09 11:04:01 +0100 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2020-11-17 10:54:06 +0000 |
| commit | 453de21c2b8281228173a7b689120b92929743d6 (patch) | |
| tree | 44281fbc42773442dc6631e85662979ce600403b /drivers/scsi/storvsc_drv.c | |
| parent | e8b7db38449ac5b950a3f00519171c4be3e226ff (diff) | |
scsi: storvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening
Currently, pointers to guest memory are passed to Hyper-V as
transaction IDs in storvsc. In the face of errors or malicious
behavior in Hyper-V, storvsc should not expose or trust the transaction
IDs returned by Hyper-V to be valid guest memory addresses. Instead,
use small integers generated by vmbus_requestor as requests
(transaction) IDs.
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>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Link: https://lore.kernel.org/r/20201109100402.8946-3-parri.andrea@gmail.com
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
| -rw-r--r-- | drivers/scsi/storvsc_drv.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 0c65fbd41035..369a6c626672 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -399,6 +399,7 @@ static int storvsc_timeout = 180; static struct scsi_transport_template *fc_transport_template; #endif +static struct scsi_host_template scsi_driver; static void storvsc_on_channel_callback(void *context); #define STORVSC_MAX_LUNS_PER_TARGET 255 @@ -698,6 +699,12 @@ static void handle_sc_creation(struct vmbus_channel *new_sc) memset(&props, 0, sizeof(struct vmstorage_channel_properties)); + /* + * The size of vmbus_requestor is an upper bound on the number of requests + * that can be in-progress at any one time across all channels. + */ + new_sc->rqstor_size = scsi_driver.can_queue; + ret = vmbus_open(new_sc, storvsc_ringbuffer_size, storvsc_ringbuffer_size, @@ -1242,9 +1249,17 @@ static void storvsc_on_channel_callback(void *context) foreach_vmbus_pkt(desc, channel) { void *packet = hv_pkt_data(desc); struct storvsc_cmd_request *request; + u64 cmd_rqst; + + cmd_rqst = vmbus_request_addr(&channel->requestor, + desc->trans_id); + if (cmd_rqst == VMBUS_RQST_ERROR) { + dev_err(&device->device, + "Incorrect transaction id\n"); + continue; + } - request = (struct storvsc_cmd_request *) - ((unsigned long)desc->trans_id); + request = (struct storvsc_cmd_request *)(unsigned long)cmd_rqst; if (request == &stor_device->init_request || request == &stor_device->reset_request) { @@ -1265,6 +1280,12 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size, memset(&props, 0, sizeof(struct vmstorage_channel_properties)); + /* + * The size of vmbus_requestor is an upper bound on the number of requests + * that can be in-progress at any one time across all channels. + */ + device->channel->rqstor_size = scsi_driver.can_queue; + ret = vmbus_open(device->channel, ring_size, ring_size, @@ -1572,7 +1593,6 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) struct vstor_packet *vstor_packet; int ret, t; - stor_device = get_out_stor_device(device); if (!stor_device) return FAILED; |