D13956.id38103.diff
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D13956.id38103.diff
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	Index: sys/amd64/amd64/pmap.c
	===================================================================
	--- sys/amd64/amd64/pmap.c
	+++ sys/amd64/amd64/pmap.c
	@@ -2575,6 +2575,12 @@
	pml4 = &pmap->pm_pml4[pml4index];
	*pml4 = VM_PAGE_TO_PHYS(m) \| PG_U \| PG_RW \| PG_V \| PG_A \| PG_M;
	if (pmap->pm_pml4u != NULL && pml4index < NUPML4E) {
	+ /*
	+ * Safety belt: ensure that usermode traps if
	+ * kernel mode mappings leak into user mode.
	+ */
	+ *pml4 \|= pg_nx;
	+
	pml4u = &pmap->pm_pml4u[pml4index];
	*pml4u = VM_PAGE_TO_PHYS(m) \| PG_U \| PG_RW \| PG_V \|
	PG_A \| PG_M;