patch "drivers: hv: Turn off write permission on the hypercall page" added to char-misc-testing

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

drivers: hv: Turn off write permission on the hypercall page

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From: "K. Y. Srinivasan" <[email protected]>
Date: Wed, 8 Feb 2017 18:30:56 -0700
Subject: drivers: hv: Turn off write permission on the hypercall page

The hypercall page only needs to be executable but currently it is setup to be writable as well. Fix the issue.

---
 arch/x86/hyperv/hv_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index c224b7df4d21..db64baf0e500 100644
@@ -125,7 +125,7 @@ void hyperv_init(void)
 	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);
 	wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);
 
-	hypercall_pg  = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
+	hypercall_pg  = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);
 	if (hypercall_pg == NULL) {
 		wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
 		return;

2.11.1