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Subject[PATCH v3 2/2] mm/userfaultfd: add VM_WARN_ONCE()
Date
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 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
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