diff options
| -rw-r--r-- | mm/mprotect.c | 5 |
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; |