feat(MDC): experimental mdc

MacDirtyCow/vm_unaligned_copy_switch_race.h

@@ -0,0 +1,20 @@
+//
+//  vm_unaligned_copy_switch_race.h
+//  AltStore
+//
+//  Created by June P on 2023/11/28.
+//  Copyright © 2023 SideStore. All rights reserved.
+//
+
+#ifndef vm_unaligned_copy_switch_race_h
+#define vm_unaligned_copy_switch_race_h
+
+#include <stdlib.h>
+#include <stdbool.h>
+/// Uses CVE-2022-46689 to overwrite `overwrite_length` bytes of `file_to_overwrite` with `overwrite_data`, starting from `file_offset`.
+/// `file_to_overwrite` should be a file descriptor opened with O_RDONLY.
+/// `overwrite_length` must be less than or equal to `PAGE_SIZE`.
+/// Returns `true` if the overwrite succeeded, and `false` if the device is not vulnerable.
+bool unaligned_copy_switch_race(int file_to_overwrite, off_t file_offset, const void* overwrite_data, size_t overwrite_length);
+
+#endif /* vm_unaligned_copy_switch_race_h */