From: "K. Y. Srinivasan" <[email protected]> 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 <[email protected]> Acked-by: Kees Cook <[email protected]> Reported-by: Stephen Hemminger <[email protected]> Tested-by: Stephen Hemminger <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> Signed-off-by: Willy Tarreau <[email protected]> --- drivers/hv/hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index b103955..4e4cb3d 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -154,7 +154,7 @@ 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; -- 2.8.0.rc2.1.gbe9624a
