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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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