linux-kernel - printk()s of user-supplied strings (Re: [PATCH] binfmt_elf.c : the BAD

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Date:	Tue, 22 Aug 2006 07:07:55 +0400
From:	Solar Designer <solar@...nwall.com>
To:	Ernie Petrides <petrides@...hat.com>
Cc:	Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org
Subject: printk()s of user-supplied strings (Re: [PATCH] binfmt_elf.c : the BAD_ADDR macro again)

On Mon, Aug 21, 2006 at 07:36:01PM -0400, Ernie Petrides wrote:
> -			printk(KERN_ERR "Unable to load interpreter %.128s\n",
> -				elf_interpreter);

I'd rather have this message rate-limited, not dropped completely.

Another long-time concern that I had is that we've got some printk()s
of user-supplied string data.  What about embedded linefeeds - can this
be used to produce fake kernel messages with arbitrary log level (syslog
priority)?  It certainly seems so.

Also, there are terminal controls...

Alexander
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