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

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Date:	Wed, 17 Dec 2008 11:31:06 -0500
From:	Steven Rostedt <srostedt@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	George Spelvin <linux@...izon.com>, peterz@...radead.org,
	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] globmatch() helper function


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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