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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20060822030755.GB830@openwall.com>
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/