Re: [RFC] globmatch() helper function

[Steven Rostedt <srostedt@redhat.com>]

On Wed, 2008-12-17 at 17:51 +0100, Andi Kleen wrote:
> > OK, lets compromise with WARN_ON_ONCE() ;-)
> 
> I don't think WARN_ON is the right way to handle bad user input.
> It implies that when someone typos the result might end up in Arjan's 
> kerneloops.org database, which is not good.


Since I recommended an internal helper function, we could have:

int globmatch(const char *pat, const char *str)
{
	int ret;

	ret = globmatch_internal(pat, str, 0);
	if (ret < 0)
		WARN_ON();
	return ret;
}

int globmatch_user(const char *pat, const char *str)
{
	return globmatch_internal(pat, str, 0);
}


This would warn on if a kernel user caused the overflow, and also gives
a function that user space input could use, that would not warn on
overflow.

-- Steve