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-rw-r--r--security/device_cgroup.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 442204cc22d9..4b877a92a7ea 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -457,6 +457,15 @@ struct cgroup_subsys devices_subsys = {
.destroy = devcgroup_destroy,
.subsys_id = devices_subsys_id,
.base_cftypes = dev_cgroup_files,
+
+ /*
+ * While devices cgroup has the rudimentary hierarchy support which
+ * checks the parent's restriction, it doesn't properly propagates
+ * config changes in ancestors to their descendents. A child
+ * should only be allowed to add more restrictions to the parent's
+ * configuration. Fix it and remove the following.
+ */
+ .broken_hierarchy = true,
};
int __devcgroup_inode_permission(struct inode *inode, int mask)