linux-kernel - Re: [RFC] [PATCH] Improve the remove sysctl warnings.

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Date:	Thu, 19 Oct 2006 15:55:49 -0400 (EDT)
From:	Cal Peake <cp@...olutedigital.net>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>,
	Albert Cahalan <acahalan@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH] Improve the remove sysctl warnings.

On Thu, 19 Oct 2006, Alexey Dobriyan wrote:

> On Thu, Oct 19, 2006 at 12:25:20PM -0400, Cal Peake wrote:
> > On Wed, 18 Oct 2006, Eric W. Biederman wrote:
> >
> > >  	if (msg_count < 5) {
> > >  		msg_count++;
> > >  		printk(KERN_INFO
> > >  			"warning: process `%s' used the removed sysctl "
> > > -			"system call\n", current->comm);
> > > +			"system call with ", current->comm);
> > > +		for (i = 0; i < tmp.nlen; i++)
> > > +			printk("%d.", name[i]);
> > > +		printk("\n");
> > >  	}
> >
> > We should prolly kill the counter now.
> 
> sysctl(2) callable by everyone including local lusers willing to fill logs.

Users don't even need to write a program to do this, see logger(1). If we 
keep the counter then after 5 calls we lose potential debugging info.

  - C.

-- 
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