Subject: Re: [RFC] globmatch() helper function
From: Steven Rostedt <srostedt@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: George Spelvin <linux@horizon.com>, peterz@infradead.org,
        andi@firstfloor.org, linux-kernel@vger.kernel.org
In-Reply-To: <49492733.9000108@kernel.org>
References: <20081217104247.28440.qmail@science.horizon.com>
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	 <20081217160417.18507.qmail@science.horizon.com>
	 <49492733.9000108@kernel.org>
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Organization: Red Hat
Date: Wed, 17 Dec 2008 11:31:06 -0500
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On Thu, 2008-12-18 at 01:22 +0900, Tejun Heo wrote:
> Hello,
> 
> George Spelvin wrote:
> > Do people think that would be, on balance, better?  It would be plenty
> > good enough for the blacklist application.
> 
> Just pass a depth parameter and trigger WARN_ON() and return -EINVAL
> when it exceeds ten.  It's a five minute change and should be enough
> for kernel usages.

If this is ever expected to be used by userspace, I would not include
the WARN_ON. If this is a generic function, then I'll include in in
ftrace as well, and that takes userspace input. The last thing I want is
a DoS because of printk's to the serial console because some userspace
app is constantly writing bad patterns to this file.

-- Steve


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