Presence of zero pages in the mapping would disclose content of the
mapping. Don't use them if KVM memory protection is enabled.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
arch/s390/include/asm/pgtable.h | 2 +-
include/linux/mm.h | 4 ++--
mm/huge_memory.c | 3 +--
mm/memory.c | 3 +--
4 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index b55561cc8786..72ca3b3f04cb 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -543,7 +543,7 @@ static inline int mm_alloc_pgste(struct mm_struct *mm)
* In the case that a guest uses storage keys
* faults should no longer be backed by zero pages
*/
-#define mm_forbids_zeropage mm_has_pgste
+#define vma_forbids_zeropage(vma) mm_has_pgste(vma->vm_mm)
static inline int mm_uses_skeys(struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 74efc51e63f0..ee713b7c2819 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -130,8 +130,8 @@ extern int mmap_rnd_compat_bits __read_mostly;
* s390 does this to prevent multiplexing of hardware bits
* related to the physical page in case of virtualization.
*/
-#ifndef mm_forbids_zeropage
-#define mm_forbids_zeropage(X) (0)
+#ifndef vma_forbids_zeropage
+#define vma_forbids_zeropage(vma) vma_is_kvm_protected(vma)
#endif
/*
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 40974656cb43..383614b24c4f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -709,8 +709,7 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
return VM_FAULT_OOM;
if (unlikely(khugepaged_enter(vma, vma->vm_flags)))
return VM_FAULT_OOM;
- if (!(vmf->flags & FAULT_FLAG_WRITE) &&
- !mm_forbids_zeropage(vma->vm_mm) &&
+ if (!(vmf->flags & FAULT_FLAG_WRITE) && !vma_forbids_zeropage(vma) &&
transparent_hugepage_use_zero_page()) {
pgtable_t pgtable;
struct page *zero_page;
diff --git a/mm/memory.c b/mm/memory.c
index e28bd5f902a7..9907ffe00490 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3495,8 +3495,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
return 0;
/* Use the zero-page for reads */
- if (!(vmf->flags & FAULT_FLAG_WRITE) &&
- !mm_forbids_zeropage(vma->vm_mm)) {
+ if (!(vmf->flags & FAULT_FLAG_WRITE) && !vma_forbids_zeropage(vma)) {
entry = pte_mkspecial(pfn_pte(my_zero_pfn(vmf->address),
vma->vm_page_prot));
vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
--
2.26.2
