[PATCH RESEND 0/1] yama: clean-up ptrace relations upon activating YAMA_SCOPE_NO_ATTACH

[Ethan Ferguson]

Once yama's ptrace_scope gets set to it's max value (currently
YAMA_SCOPE_NO_ATTACH), all ptrace actions will forever be denied.
However, processes may still add ptrace relations, and the memory
to store these relations is still allocated, even though it is never
used again.

This patch cleans up all memory related to ptracer_relations upon
YAMA_SCOPE_NO_ATTACH, and additionally disallows further modification
of ptracer_relations from processes.

Ethan Ferguson (1):
  yama: clean-up ptrace relations upon activating YAMA_SCOPE_NO_ATTACH

 security/yama/yama_lsm.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

base-commit: cf2f06f7152d
-- 
2.43.0