tech-kern: copyinstr() with a zero-length buffer

Subject: copyinstr() with a zero-length buffer
To: None <tech-kern@netbsd.org>
From: Chuck Silvers <chuq@chuq.com>
List: tech-kern
Date: 11/02/1999 00:00:54

hi kernel folks,

here's a philosophical question for ya:  is it legal to call copyinstr()
with maxlen == 0?  the sparc will panic if this happens, but the sample
program in PR 7838 will cause sys_execve() to do just that.
so which is wrong?

-Chuck