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Index: head/sys/vm/vm_mmap.c
===================================================================
--- head/sys/vm/vm_mmap.c
+++ head/sys/vm/vm_mmap.c
@@ -600,6 +600,12 @@
addr -= pageoff;
size += pageoff;
size = (vm_size_t) round_page(size);
+#ifdef COMPAT_FREEBSD32
+ if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
+ if (((addr + size) & 0xffffffff) < addr)
+ return (EINVAL);
+ } else
+#endif
if (addr + size < addr)
return (EINVAL);

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