linux-kernel - Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer

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Date:	Thu, 10 May 2012 14:58:08 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Kay Sievers <kay@...y.org>, "Ted Ts'o" <tytso@....edu>,
	Ingo Molnar <mingo@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Sasha Levin <levinsasha928@...il.com>,
	Greg Kroah-Hartmann <greg@...ah.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length
 record buffer

On Thu, May 10, 2012 at 2:11 PM, Joe Perches <joe@...ches.com> wrote:
>
> I think it's a distinction without a difference for,
> as fas as I know, that's a case that doesn't exist
> in the current kernel.

So? Even if we hadn't had this bug before (we have), your argument is
utter crap. Even if we weren't to have that patter right *now*, that
doesn't mean that it cannot happen.

Your grep is also not at all exhaustive. What if somebody does

   printk("%s.."

how are you going to prove that '%s' doesn't contain a level marker
thing? It's much easier to just say "use a KERN_CONT" (or more
commonly KERN_DEFAULT) to avoid the problem.

We do need an escape model. The current KERN_CONT does that. Stop
arguing for crap.

                 Linus
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