From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Stephen Hemminger" , "K. Y. Srinivasan" , "Greg Kroah-Hartman" , "Kees Cook" Date: Thu, 01 Jun 2017 16:40:55 +0100 Message-ID: Subject: [PATCH 3.2 044/101] drivers: hv: Turn off write permission on the hypercall page In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.2.89-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: "K. Y. Srinivasan" commit 372b1e91343e657a7cc5e2e2bcecd5140ac28119 upstream. 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 Acked-by: Kees Cook Reported-by: Stephen Hemminger Tested-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.2: adjust filename, context] Signed-off-by: Ben Hutchings --- drivers/hv/hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -178,7 +178,7 @@ int hv_init(void) /* See if the hypercall page is already set */ rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); - virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC); + virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX); if (!virtaddr) goto cleanup;