[CRIU] [PATCH] cg: Mark yard mount as private

[Pavel Emelyanov]

Otherwise cgroups sub-mounts may propagate to another namespaces
and the directory would become unremovable.

Signed-off-by: Pavel Emelyanov <xemul at parallels.com>

---

diff --git a/cgroup.c b/cgroup.c
index 2d9ebad..5234562 100644
--- a/cgroup.c
+++ b/cgroup.c
@@ -362,6 +362,11 @@ static int prepare_cgroup_sfd(CgSetEntry *root_set)
 		goto err;
 	}
 
+	if (mount("none", cg_yard, NULL, MS_PRIVATE, NULL)) {
+		pr_perror("Can't make cgyard private");
+		goto err;
+	}
+
 	for (i = 0; i < root_set->n_ctls; i++) {
 		ControllerEntry *ce = root_set->ctls[i];
 		char *opt = ce->name;