Messages in this thread Patch in this message | | | From | Muhammad Usama Anjum <> | Subject | [PATCH v4 2/2] mm/userfaultfd: add VM_WARN_ONCE() | Date | Thu, 16 Feb 2023 14:16:56 +0500 |
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Add VM_WARN_ONCE() to uffd_wp_range() to detect range (start, len) abuse.
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com> --- 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"); if (enable_wp) mm_cp_flags = MM_CP_UFFD_WP; else -- 2.39.1
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