Document that a PTY master retains control over processes attached to the
terminal, and add a selftest covering this boundary alongside the direct
signal restriction.

Since v2, the documentation follows Mickaël's capability framing, the UAPI
description refers to arbitrary signal targets, and the series includes the
requested selftest.

Link: https://lore.kernel.org/r/20260916152336.1589383-1-clusk@northecho.dev

Christopher Lusk (2):
  docs: landlock: clarify TTY signal scoping
  selftests/landlock: cover TTY signal scoping

 Documentation/userspace-api/landlock.rst      |   6 +
 include/uapi/linux/landlock.h                 |   2 +-
 .../selftests/landlock/scoped_signal_test.c   | 175 ++++++++++++++++++
 3 files changed, 182 insertions(+), 1 deletion(-)

-- 
2.55.0