FAILED: patch "[PATCH] drivers: hv: Turn off write permission on the hypercall page" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Mar 10, 2017

Subsystems (3)

Stable branch x86 Hyper-V/Azure core and drivers

lore

Share & tools

lore

[email protected]

author maintainer

2017-03-10 07:58 UTC #0 lore raw

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 372b1e91343e657a7cc5e2e2bcecd5140ac28119 Mon Sep 17 00:00:00 2001

From: "K. Y. Srinivasan" <[email protected]>
Date: Wed, 8 Feb 2017 18:30:56 -0700
Subject: [PATCH] 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.

Signed-off-by K. Y. Srinivasan <[email protected]>

Cc <[email protected]>

Acked-by Kees Cook <[email protected]>

Reported-by Stephen Hemminger <[email protected]>

Tested-by Stephen Hemminger <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>

arch/x86/hyperv/hv_init.c +1 -1

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;