We can satisfy the permission check by creating a temporary file with the required mode:
In long strings of encoded data (like images or PDF fragments), "fsxwx" can appear by chance as a sequence of characters. We can satisfy the permission check by creating
The name fsxwx is a hint: the program checks the ( st_mode ) against a hard‑coded mask that corresponds to the octal value 0x1A4 ( 0100644 in the stat structure). If the mask matches, the program prints the file’s content; otherwise it aborts. the program prints the file’s content
(gdb) break *print_file+0x40 # a point after the printf call (gdb) run /tmp/evil (gdb) info frame We can satisfy the permission check by creating