Some programs, like sshd and chromium, make use of this fact to change the process name as shown in procfs and ps. On Linux, every string that argv[] and envp[] point to are stored in one contiguous block of memory. Programs can change the name of the process by writing a new string starting at *argv[0] and overflowing into the *envp[] memory as needed. (Though the program needs to strdup() the environ[] entries beforehand since they initially point to envp[] strings.)

For example, chromium's implementation: https://source.chromium.org/chromium/chromium/src/+/refs/tag...