diff options
| -rw-r--r-- | mm/mprotect.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 763409e62ef6..cccad7974b3b 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -338,8 +338,15 @@ static inline unsigned long change_pmd_range(struct mmu_gather *tlb, } if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) { - if (next - addr != HPAGE_PMD_SIZE) { + if ((next - addr != HPAGE_PMD_SIZE) || + uffd_wp_protect_file(vma, cp_flags)) { __split_huge_pmd(vma, pmd, addr, false, NULL); + /* + * For file-backed, the pmd could have been + * cleared; make sure pmd populated if + * necessary, then fall-through to pte level. + */ + change_pmd_prepare(vma, pmd, cp_flags); } else { /* * change_huge_pmd() does not defer TLB flushes, |