From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out1-smtp.messagingengine.com ([66.111.4.25]:57025 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754955AbdCJH6X (ORCPT ); Fri, 10 Mar 2017 02:58:23 -0500 Subject: FAILED: patch "[PATCH] drivers: hv: Turn off write permission on the hypercall page" failed to apply to 4.9-stable tree To: kys@microsoft.com, gregkh@linuxfoundation.org, keescook@chromium.org, stable@vger.kernel.org, stephen@networkplumber.org Cc: From: Date: Fri, 10 Mar 2017 08:58:13 +0100 Message-ID: <148913269325115@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 372b1e91343e657a7cc5e2e2bcecd5140ac28119 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" 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 Cc: Acked-by: Kees Cook Reported-by: Stephen Hemminger Tested-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index c224b7df4d21..db64baf0e500 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -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;