Add VM_WARN_ONCE() to uffd_wp_range() to detect range (start, len) abuse. Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx> --- mm/userfaultfd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 366dc097ab11..9db77c36ef18 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -716,6 +716,8 @@ void uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, unsigned int mm_cp_flags; struct mmu_gather tlb; + VM_WARN_ONCE(start < dst_vma->vm_start || start + len > dst_vma->vm_end, + "The address range exceeds VMA boundary.\n"); if (enable_wp) mm_cp_flags = MM_CP_UFFD_WP; else -- 2.39.1
