This is a note to let you know that I've just added the patch titled
dmaengine: idxd: Do not enable user type Work Queue without Shared Virtual Addressing
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-idxd-do-not-enable-user-type-work-queue-wi.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 91c740fee4773eac5ca7b8b463e78d44c7557c20
Author: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Date: Fri Oct 14 15:25:41 2022 -0700
dmaengine: idxd: Do not enable user type Work Queue without Shared Virtual Addressing
When the idxd_user_drv driver is bound to a Work Queue (WQ) device
without IOMMU or with IOMMU Passthrough without Shared Virtual
Addressing (SVA), the application gains direct access to physical
memory via the device by programming physical address to a submitted
descriptor. This allows direct userspace read and write access to
arbitrary physical memory. This is inconsistent with the security
goals of a good kernel API.
Unlike vfio_pci driver, the IDXD char device driver does not provide any
ways to pin user pages and translate the address from user VA to IOVA or
PA without IOMMU SVA. Therefore the application has no way to instruct the
device to perform DMA function. This makes the char device not usable for
normal application usage.
Since user type WQ without SVA cannot be used for normal application usage
and presents the security issue, bind idxd_user_drv driver and enable user
type WQ only when SVA is enabled (i.e. user PASID is enabled).
Fixes: 448c3de8ac83 ("dmaengine: idxd: create user driver for wq 'device'")
Cc: stable@xxxxxxxxxxxxxxx
Suggested-by: Arjan Van De Ven <arjan.van.de.ven@xxxxxxxxx>
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221014222541.3912195-1-fenghua.yu@xxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c
index 033df43db0ce..91e335f62b30 100644
--- a/drivers/dma/idxd/cdev.c
+++ b/drivers/dma/idxd/cdev.c
@@ -312,6 +312,24 @@ static int idxd_user_drv_probe(struct idxd_dev *idxd_dev)
if (idxd->state != IDXD_DEV_ENABLED)
return -ENXIO;
+ /*
+ * User type WQ is enabled only when SVA is enabled for two reasons:
+ * - If no IOMMU or IOMMU Passthrough without SVA, userspace
+ * can directly access physical address through the WQ.
+ * - The IDXD cdev driver does not provide any ways to pin
+ * user pages and translate the address from user VA to IOVA or
+ * PA without IOMMU SVA. Therefore the application has no way
+ * to instruct the device to perform DMA function. This makes
+ * the cdev not usable for normal application usage.
+ */
+ if (!device_user_pasid_enabled(idxd)) {
+ idxd->cmd_status = IDXD_SCMD_WQ_USER_NO_IOMMU;
+ dev_dbg(&idxd->pdev->dev,
+ "User type WQ cannot be enabled without SVA.\n");
+
+ return -EOPNOTSUPP;
+ }
+
mutex_lock(&wq->wq_lock);
wq->type = IDXD_WQT_USER;
rc = __drv_enable_wq(wq);
diff --git a/include/uapi/linux/idxd.h b/include/uapi/linux/idxd.h
index c750eac09fc9..7355f498923e 100644
--- a/include/uapi/linux/idxd.h
+++ b/include/uapi/linux/idxd.h
@@ -28,6 +28,7 @@ enum idxd_scmd_stat {
IDXD_SCMD_WQ_NONE_CONFIGURED = 0x800d0000,
IDXD_SCMD_WQ_NO_SIZE = 0x800e0000,
IDXD_SCMD_WQ_NO_PRIV = 0x800f0000,
+ IDXD_SCMD_WQ_USER_NO_IOMMU = 0x80110000,
};
#define IDXD_SCMD_SOFTERR_MASK 0x80000000
