Re: setrlimit(RLIMIT_NETWORK) vs. prctl(???)

[Michael Stone <michael@laptop.org>]

Ulrich,

As promised, here's a draft based on prctl() for comparison with the
rlimit()-based approach presented in the first attempt.

It behaves as I expect in simple testing with busybox "nc" and I'll do a more
thorough test shortly. I'm sending it now because I think that it's good enough
to give a decent overview of what the end result of this implementation
strategy might look like.

Regards,

Michael

------

Michael Stone (3):
  Security: Add prctl(PR_{GET,SET}_NETWORK) interface.
  Security: Implement prctl(PR_SET_NETWORK, PR_NETWORK_OFF) semantics.
  Security: Document prctl(PR_{GET,SET}_NETWORK).

 Documentation/prctl_network.txt |   69 +++++++++++++++++++++++++++++++++++++++
 include/linux/prctl.h           |    7 ++++
 include/linux/prctl_network.h   |    7 ++++
 include/linux/sched.h           |    2 +
 kernel/Makefile                 |    2 +-
 kernel/fork.c                   |    2 +
 kernel/prctl_network.c          |   37 +++++++++++++++++++++
 kernel/ptrace.c                 |    2 +
 kernel/sys.c                    |    7 ++++
 net/socket.c                    |   51 +++++++++++++++++++++-------
 net/unix/af_unix.c              |   19 +++++++++++
 11 files changed, 191 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/prctl_network.txt
 create mode 100644 include/linux/prctl_network.h
 create mode 100644 kernel/prctl_network.c