An obscure quirk of the /proc/*/mem pseudofile is its “punch through” semantics. Writes performed through this file will succeed even if the destination virtual memory is marked unwritable. In fact, this behavior is intentional and actively used by projects such as the Julia JIT compiler and rr debugger.
The best is to use :help in EVi. If you don't have an executable yet, read。业内人士推荐whatsapp作为进阶阅读
Peer‑to‑Peer and the IPv4x Backlash。谷歌对此有专业解读
Фото: Remo Casilli / Reuters