[v2,0/5] audit: refactors and fixes for potential deadlocks

Message

Eiichi Tsukata May 11, 2023, 5:21 a.m. UTC

This patchset consists of the following refactors and fixes for
potential deadlocks.

  Patch1-3: Refactorings and a small fix preferable for following deadlock fixes
  Patch4: Fix for deadlock caused by wait/wake_up race in @audit_queue full
  Patch5: Fix for deadlock caused by missing wake_up

v1->v2:
  - wait_for_kauditd(): returns 0 if @audit_queue is not full
  - Add another fix for deadlock caused by missing wake_up

Eiichi Tsukata (5):
  audit: refactor queue full checks
  audit: account backlog waiting time in audit_receive()
  audit: convert DECLARE_WAITQUEUE to DEFINE_WAIT
  audit: check if audit_queue is full after prepare_to_wait_exclusive()
  audit: do not use exclusive wait in audit_receive()

 kernel/audit.c | 78 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 50 insertions(+), 28 deletions(-)