fix memmod checkptr fail

Author: lysShub

driver/memmod/memmod_windows.go

@@ -690,7 +690,7 @@ func alignUp(value, alignment uintptr) uintptr {
 }
 
 func a2p(addr uintptr) unsafe.Pointer {
-	return unsafe.Pointer(addr)
+	return unsafe.Add(unsafe.Pointer(nil), addr)
 }
 
 func memcpy(dst, src, size uintptr) {

driver/memmod/syscall_windows.go

@@ -117,10 +117,14 @@ type IMAGE_NT_HEADERS struct {
 }
 
 func (ntheader *IMAGE_NT_HEADERS) Sections() []IMAGE_SECTION_HEADER {
-	return (*[0xffff]IMAGE_SECTION_HEADER)(unsafe.Pointer(
-		(uintptr)(unsafe.Pointer(ntheader)) +
-			unsafe.Offsetof(ntheader.OptionalHeader) +
-			uintptr(ntheader.FileHeader.SizeOfOptionalHeader)))[:ntheader.FileHeader.NumberOfSections]
+	ptr := unsafe.Pointer(ntheader)
+	ptr = unsafe.Add(ptr, unsafe.Offsetof(ntheader.OptionalHeader))
+	ptr = unsafe.Add(ptr, ntheader.FileHeader.SizeOfOptionalHeader)
+
+	return unsafe.Slice(
+		(*IMAGE_SECTION_HEADER)(ptr),
+		ntheader.FileHeader.NumberOfSections,
+	)
 }
 
 const (