[PATCH v2 0/4] selinux: fix race when removing selinuxfs entries

From: Ondrej Mosnacek <omosnace@redhat.com>
To: selinux@vger.kernel.org, Paul Moore <paul@paul-moore.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>, linux-fsdevel@vger.kernel.org
Subject: [PATCH v2 0/4] selinux: fix race when removing selinuxfs entries
Date: Thu,  1 Aug 2019 16:02:39 +0200	[thread overview]
Message-ID: <20190801140243.24080-1-omosnace@redhat.com> (raw)

After hours and hours of getting familiar with dcache and debugging,
I think I finally found a solution that works and hopefully stands a
chance of being committed.

The series still doesn't address the lack of atomicity of the policy
reload transition, but this is part of a wider problem and can be
resolved later. Let's fix at least the userspace-triggered lockup
first.

Changes since v1:
 - switch to hopefully proper and actually working solution instead
   of the horrible mess I produced last time...
v1: https://lore.kernel.org/selinux/20181002111830.26342-1-omosnace@redhat.com/T/

Ondrej Mosnacek (4):
  d_walk: optionally lock also parent inode
  d_walk: add leave callback
  dcache: introduce d_genocide_safe()
  selinux: use d_genocide_safe() in selinuxfs

 fs/dcache.c                  | 87 +++++++++++++++++++++++++++++++-----
 include/linux/dcache.h       |  1 +
 security/selinux/selinuxfs.c |  2 +-
 3 files changed, 77 insertions(+), 13 deletions(-)

-- 
2.21.0