我是否需要在程序集中复制命令行 arguments

Question

I work with fasm but maybe this question doesn't rely on assembly language version. Where is command line arguments string stored? Do I need to copy this string at program start or it is guaranteed to persist indefinitely? Can buffer overflows etc from my program overwrite original?

Answer 1

Command line arguments are part of the process environment block (PEB) and do not change after the process starts. You can access the command line via GetCommandLineW , and you can parse the arguments yourself. There also exists CommandLineToArgvW which does some parsing for you.

The string data is in writable memory, so yes if you have buggy / insecure code that modifies one arg, an overflow in it could modify another one.