Fsxwx

Create /tmp/evil containing a simple format string that prints a stack value we know points into libc:

[ ... previous frame ... ] return address (to print_file) saved rbp argv[1] (pointer to /tmp/evil) ... Create /tmp/evil containing a simple format string that

We can also calculate it manually: the stack pointer ( rsp ) at the entry of printf is known ( 0x7fffffffdc20 ), and the saved RIP lives at rsp+8 . Create /tmp/evil containing a simple format string that

We will write the 8‑byte address 0x7ffff79c755f (first gadget) to 0x7fffffffdc28 . Create /tmp/evil containing a simple format string that

binary = ELF('./fsxwx') libc = ELF('/lib/x86_64-linux-gnu/libc.so.6')

For developers, "fsxwx" might occasionally appear as part of: