linux-kernel - Re: [RFC] globmatch() helper function

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Date:	Wed, 17 Dec 2008 14:28:42 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"George Spelvin" <linux@...izon.com>
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org
Subject: Re: [RFC] globmatch() helper function

"George Spelvin" <linux@...izon.com> writes:

Wow, finally a name.

> 			break;
> 		case '*':
> 			if (pat[1] == '\0')	/* Optimize trailing * case */
> 				return true;
> 			/* Recurse on each possible tail of str */
> 			while (!globmatch(pat+1, str))
> 				if (!*str++)
> 					return false;

I'm uneasy with the unbounded recursion. Sure currently all the users
are controlled in kernel source code and expect to put in sane patterns.
But if someone ever adds a user controlled glob in some way it will be 
trivial to crash/overwrite memory with the limited kernel stack.
And with such a generalized function it's likely to be used more
in the future.

-Andi

-- 
ak@...ux.intel.com
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