[kernel-hardening] Re: [PATCH] kernel: escape non-ASCII and control characters in printk()

Matthew Garrett
2011-06-23T13:36:05Z

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?

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Matthew Garrett | mjg59@srcf.ucam.org