tree 97142f1aa020ab593f1860a0f8521a243c98cdf6
parent 190ecb190a9cd8c0599d8499b901e3c32e87966a
author Tycho Andersen <tycho@tycho.ws> 1582138889 -0700
committer Tejun Heo <tj@kernel.org> 1583340813 -0500

cgroup1: don't call release_agent when it is ""

Older (and maybe current) versions of systemd set release_agent to "" when
shutting down, but do not set notify_on_release to 0.

Since 64e90a8acb85 ("Introduce STATIC_USERMODEHELPER to mediate
call_usermodehelper()"), we filter out such calls when the user mode helper
path is "". However, when used in conjunction with an actual (i.e. non "")
STATIC_USERMODEHELPER, the path is never "", so the real usermode helper
will be called with argv[0] == "".

Let's avoid this by not invoking the release_agent when it is "".

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Tejun Heo <tj@kernel.org>