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

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Date:	Wed, 22 Jun 2011 09:38:03 -0700
From:	Joe Perches <joe@...ches.com>
To:	Vasiliy Kulikov <segoon@...nwall.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, 2011-06-22 at 13:53 +0400, Vasiliy Kulikov wrote:
> This patch escapes all characters outside of allowed '\n' plus 0x20-0x7E
> charset passed to printk().

[]

> diff --git a/kernel/printk.c b/kernel/printk.c
[]
> +static void emit_log_char_escaped(char c)
> +{
> +	char buffer[8];
> +	int i, len;
> +
> +	if ((c >= ' ' && c < 127) || c == '\n')

	if (isprint(c))

Why not add this to emit_log_char?


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