[Some notes][1] about an attempt to get a backdoor into the Linux kernel, circa 2003. Apparently unsuccessful.  The [contemporary commentary][2] was fairly interesting.

The linux kernel distribution machines got [compromised again in 2011][3], but it seems like no code got changed that time.


  [1]: http://lkml.indiana.edu/hypermail/linux/kernel/0311.0/0621.html
  [2]: http://www.securityfocus.com/news/7388
  [3]: http://lwn.net/Articles/457142/