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Commit 372b1e91 authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

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: default avatarK. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Reported-by: default avatarStephen Hemminger <stephen@networkplumber.org>
Tested-by: default avatarStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3454323c

arch/x86/hyperv/hv_init.c

+1 −1
Original line number Diff line number Diff line
@@ -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;