Re: [PATCH] kernel: escape non-ASCII and control characters inprintk()

[Matthew Garrett]

On Wed, Jun 22, 2011 at 08:37:42AM -0700, Greg KH wrote:
> On Wed, Jun 22, 2011 at 01:53:41PM +0400, Vasiliy Kulikov wrote:
> > This patch escapes all characters outside of allowed '\n' plus 0x20-0x7E
> > charset passed to printk().
> > 
> > There are numerous printk() instances with user supplied input as "%s"
> > data, and unprivileged user may craft log messages with substrings
> > containing control characters via these printk()s.  Control characters
> > might fool root viewing the logs via tty.
> 
> There are "numerous" places this could happen?

USB product identifiers?

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
--
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/