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

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Message-ID: <20110622174812.GA13392@albatros>
Date:	Wed, 22 Jun 2011 21:48:12 +0400
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>, Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	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 10:14 -0700, Joe Perches wrote:
> On Wed, 2011-06-22 at 20:53 +0400, Vasiliy Kulikov wrote:
> > On Wed, Jun 22, 2011 at 09:38 -0700, Joe Perches wrote:
> > > > +	if ((c >= ' ' && c < 127) || c == '\n')
> > > 	if (isprint(c))
> > #define isprint(c)	((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
> > It slightly differs from what I've written.  It (1) lacks '\n',
> 
> You still need tab,

Correct.

> so:
> 
> if (isprint(c) || isspace(c))

No, it also allows vertical tabs.  Looking into __ctype only ' ', '\n' and
'\t' should be allowed among all _S, so

if (isprint(c) || (c == '\n') || (c == '\t'))


Thanks,

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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