From e5db883b6ce13944619c36b93780a4d2b941232e Mon Sep 17 00:00:00 2001
From: Tanya Degurechaff
 <34323200+TanyaEleventhGoddess@users.noreply.github.com>
Date: Mon, 29 Jun 2020 23:10:51 +0200
Subject: [PATCH] Restrict removal to cgroup mountpoints created by these
 scripts

---
 cgroupfs-umount | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/cgroupfs-umount b/cgroupfs-umount
index ac26b6b..18c328f 100755
--- a/cgroupfs-umount
+++ b/cgroupfs-umount
@@ -20,11 +20,14 @@ fi
 cd /sys/fs/cgroup
 
 for sys in *; do
-	if mountpoint -q $sys; then
-		umount $sys
-	fi
-	if [ -d $sys ]; then
-		rmdir $sys || true
+	# Solves https://bugs.debian.org/950986
+	if grep -q $sys /proc/cgroups 2>/dev/null || [ $sys = 'systemd' ]; then
+		if mountpoint -q $sys; then
+			umount $sys
+		fi
+		if [ -d $sys ]; then
+			rmdir $sys || true
+		fi
 	fi
 done