[PATCH 4.9 0/1] security,selinux,smack: kill security_task_wait hook

[Alexander Grund <theflamefire89@gmail.com>]

The following (backported) patch removes a hook which has already been removed upstream. [1]
Reason is that a permission denial can lead to soft lockups and zombies.
A reproducer can be found in the initial report. [2]
I hence consider this a bugfix which is allowed for stable branches.

Background:
To reduce divergence of 4.9 to upstream before proposing to apply upstream commit
3dfc9b02864bt (LSM: Initialize security_hook_heads upon registration.)
I'm checking which changes to the LSM hooks may be applicable to 4.9 as
doing so after backporting 33dfc9b02864bt will lead to conflicts for each such commit.

[1] https://patchwork.kernel.org/project/linux-security-module/patch/1484069312-26653-1-git-send-email-sds@tycho.nsa.gov/
[2] https://patchwork.kernel.org/project/selinux/patch/58736B2E.90201@huawei.com

Stephen Smalley (1):
  security,selinux,smack: kill security_task_wait hook

 include/linux/lsm_hooks.h  |  7 -------
 include/linux/security.h   |  6 ------
 kernel/exit.c              | 19 ++-----------------
 security/security.c        |  6 ------
 security/selinux/hooks.c   |  6 ------
 security/smack/smack_lsm.c | 20 --------------------
 6 files changed, 2 insertions(+), 62 deletions(-)

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2.25.1