Patch "Drivers: hv: vmbus: Close timing hole that can corrupt per-cpu page" has been added to the 4.12-stable tree

This is a note to let you know that I've just added the patch titled

Drivers: hv: vmbus: Close timing hole that can corrupt per-cpu page

to the 4.12-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:
drivers-hv-vmbus-close-timing-hole-that-can-corrupt-per-cpu-page.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Michael Kelley <[email protected]>
Date: Thu, 18 May 2017 10:46:07 -0700
Subject: Drivers: hv: vmbus: Close timing hole that can corrupt per-cpu page

From: Michael Kelley <[email protected]>

commit 13b9abfc92be7c4454bff912021b9f835dea6e15 upstream.

Extend the disabling of preemption to include the hypercall so that another thread can't get the CPU and corrupt the per-cpu page used for hypercall arguments.

---
 drivers/hv/hv.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -82,10 +82,15 @@ int hv_post_message(union hv_connection_
 	aligned_msg->message_type = message_type;
 	aligned_msg->payload_size = payload_size;
 	memcpy((void *)aligned_msg->payload, payload, payload_size);
-	put_cpu_ptr(hv_cpu);
 
 	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
 
+	/* Preemption must remain disabled until after the hypercall
+	 * so some other thread can't get scheduled onto this cpu and
+	 * corrupt the per-cpu post_msg_page
+	 */
+	put_cpu_ptr(hv_cpu);
+
 	return status & 0xFFFF;
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.12/drivers-hv-vmbus-close-timing-hole-that-can-corrupt-per-cpu-page.patch