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-rw-r--r--mm/mprotect.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 58b629bb70de..e3309fcf586b 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -84,6 +84,11 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (!page || PageKsm(page))
continue;
+ /* Also skip shared copy-on-write pages */
+ if (is_cow_mapping(vma->vm_flags) &&
+ page_mapcount(page) != 1)
+ continue;
+
/* Avoid TLB flush if possible */
if (pte_protnone(oldpte))
continue;