Re: [PATCH] staging: dgnc: fix potential format string flaw

[Dan Carpenter]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/