From: Dan Carpenter <dan.carpenter@oracle.com>
To: Kees Cook <keescook@chromium.org>
Cc: Joe Perches <joe@perches.com>,
devel@driverdev.osuosl.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tushar Behera <tushar.behera@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
Lidza Louina <lidza.louina@gmail.com>
Subject: Re: [PATCH] staging: dgnc: fix potential format string flaw
Date: Wed, 11 Sep 2013 12:31:18 +0300 [thread overview]
Message-ID: <20130911093118.GD25896@mwanda> (raw)
In-Reply-To: <CAGXu5jLm1RNp4mB2KfeRumTqeWgcAsZ4CpQQQGA67WukERefXQ@mail.gmail.com>
On Tue, Sep 10, 2013 at 10:19:17PM -0700, Kees Cook wrote:
> In the former case, format characters will get processed by the
> sprintf logic. In the latter, they are printed as-is. In this specific
> case, if there was a way to inject strings like "ohai %n" into the
> msgbuf string, the former would actually attempt to resolve the %n. In
> the simple case, this could lead to Oopses, and in the unlucky case,
> it could allow arbitrary memory writing and execution control.
>
> http://en.wikipedia.org/wiki/Uncontrolled_format_string
The kernel ignores %n so hopefully it can't actually write to memory.
regards,
dan carpenter
next prev parent reply other threads:[~2013-09-11 9:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-11 4:41 [PATCH] staging: dgnc: fix potential format string flaw Kees Cook
2013-09-11 5:00 ` Joe Perches
2013-09-11 5:19 ` Kees Cook
2013-09-11 9:31 ` Dan Carpenter [this message]
2013-09-11 18:19 ` Kees Cook
2013-09-11 19:09 ` Joe Perches
2013-09-11 19:25 ` Kees Cook
2013-09-11 19:45 ` Joe Perches
2013-09-11 19:47 ` Kees Cook
2013-09-11 23:22 ` [RFC PATCH] vsnprintf: Remove use of %n and convert existing uses Joe Perches
2013-09-11 23:29 ` Kees Cook
2013-09-11 23:43 ` Joe Perches
2013-09-11 23:40 ` Tetsuo Handa
2013-09-12 0:04 ` Joe Perches
2013-09-12 0:19 ` Al Viro
2013-09-12 0:41 ` Joe Perches
2013-09-12 8:06 ` David Laight
2013-09-12 15:59 ` Joe Perches
2013-09-11 19:28 ` [PATCH] staging: dgnc: fix potential format string flaw Dan Carpenter
2013-09-11 19:22 ` Dan Carpenter
2013-09-11 19:26 ` Kees Cook
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