linux-kernel - Re: [PATCH] kernel: escape non-ASCII and control characters in printk()

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Message-ID: <20110623133605.GA28333@srcf.ucam.org>
Date:	Thu, 23 Jun 2011 14:36:05 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Greg KH <gregkh@...e.de>
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>, Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...il.com>,
	kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
	security@...nel.org
Subject: Re: [PATCH] kernel: escape non-ASCII and control characters in
 printk()

On Wed, Jun 22, 2011 at 08:37:42AM -0700, Greg KH wrote:
> On Wed, Jun 22, 2011 at 01:53:41PM +0400, Vasiliy Kulikov wrote:
> > This patch escapes all characters outside of allowed '\n' plus 0x20-0x7E
> > charset passed to printk().
> > 
> > There are numerous printk() instances with user supplied input as "%s"
> > data, and unprivileged user may craft log messages with substrings
> > containing control characters via these printk()s.  Control characters
> > might fool root viewing the logs via tty.
> 
> There are "numerous" places this could happen?

USB product identifiers?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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