On Thu, Feb 16, 2023 at 02:48:51PM +0500, Muhammad Usama Anjum wrote: > On 2/16/23 2:24 PM, David Hildenbrand wrote: > > On 16.02.23 10:16, Muhammad Usama Anjum wrote: > >> 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 77c5839e591c..d89ed44d2668 100644 > >> --- a/mm/userfaultfd.c > >> +++ b/mm/userfaultfd.c > >> @@ -717,6 +717,8 @@ long uffd_wp_range(struct mm_struct *dst_mm, struct > >> vm_area_struct *dst_vma, > >> struct mmu_gather tlb; > >> long ret; > >> + VM_WARN_ONCE(start < dst_vma->vm_start || start + len > > >> dst_vma->vm_end, > >> + "The address range exceeds VMA boundary.\n"); > > > > VM_WARN_ON_ONCE is sufficient (sorry for spelling out the wrong variant > > earlier). > Will do in the next version. Thanks. Shall we just squash the two patches? -- Peter Xu
