diff options
Diffstat (limited to 'mm/userfaultfd.c')
| -rw-r--r-- | mm/userfaultfd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index be2a61f4b55e..01edc18902c5 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -705,6 +705,7 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, atomic_t *mmap_changing) { struct vm_area_struct *dst_vma; + unsigned long page_mask; struct mmu_gather tlb; pgprot_t newprot; int err; @@ -742,6 +743,13 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, if (!vma_is_anonymous(dst_vma)) goto out_unlock; + if (is_vm_hugetlb_page(dst_vma)) { + err = -EINVAL; + page_mask = vma_kernel_pagesize(dst_vma) - 1; + if ((start & page_mask) || (len & page_mask)) + goto out_unlock; + } + if (enable_wp) newprot = vm_get_page_prot(dst_vma->vm_flags & ~(VM_WRITE)); else |