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| author |   Tycho Andersen <tycho@tycho.ws> | 2020-02-19 12:01:29 -0700 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2020-03-04 11:53:33 -0500 |
| commit | 2e5383d7904e60529136727e49629a82058a5607 (patch) | |
| tree | 97142f1aa020ab593f1860a0f8521a243c98cdf6 /kernel | |
| parent | cgroup: fix psi_show() crash on 32bit ino archs (diff) | |
| download | wireguard-linux-2e5383d7904e60529136727e49629a82058a5607.tar.xz wireguard-linux-2e5383d7904e60529136727e49629a82058a5607.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/cgroup-v1.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 9a6f060cbf51..f2d7cea86ffe 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -783,7 +783,7 @@ void cgroup1_release_agent(struct work_struct *work) pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); agentbuf = kstrdup(cgrp->root->release_agent_path, GFP_KERNEL); - if (!pathbuf || !agentbuf) + if (!pathbuf || !agentbuf || !strlen(agentbuf)) goto out; spin_lock_irq(&css_set_lock); |