X-Git-Url: http://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=blobdiff_plain;f=kernel%2Fpid_namespace.c;h=2d1001b4858de568515ea1f8fce0540afd4a103a;hp=5ca37fa50beb5b4d66b79e9c596943c80d363dfc;hb=e4da026f980df125a4918c3bb9fe93185c7ef12a;hpb=b331d259b1147f82d692f3b866e036017cbde8fe

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 5ca37fa..2d1001b 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -12,6 +12,7 @@
 #include <linux/pid_namespace.h>
 #include <linux/syscalls.h>
 #include <linux/err.h>
+#include <linux/acct.h>
 
 #define BITS_PER_PAGE		(PAGE_SIZE*8)
 
@@ -66,12 +67,12 @@ err_alloc:
 	return NULL;
 }
 
-static struct pid_namespace *create_pid_namespace(int level)
+static struct pid_namespace *create_pid_namespace(unsigned int level)
 {
 	struct pid_namespace *ns;
 	int i;
 
-	ns = kmem_cache_alloc(pid_ns_cachep, GFP_KERNEL);
+	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);
 	if (ns == NULL)
 		goto out;
 
@@ -84,17 +85,13 @@ static struct pid_namespace *create_pid_namespace(int level)
 		goto out_free_map;
 
 	kref_init(&ns->kref);
-	ns->last_pid = 0;
-	ns->child_reaper = NULL;
 	ns->level = level;
 
 	set_bit(0, ns->pidmap[0].page);
 	atomic_set(&ns->pidmap[0].nr_free, BITS_PER_PAGE - 1);
 
-	for (i = 1; i < PIDMAP_ENTRIES; i++) {
-		ns->pidmap[i].page = NULL;
+	for (i = 1; i < PIDMAP_ENTRIES; i++)
 		atomic_set(&ns->pidmap[i].nr_free, BITS_PER_PAGE);
-	}
 
 	return ns;
 
@@ -155,6 +152,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 {
 	int nr;
 	int rc;
+	struct task_struct *task;
 
 	/*
 	 * The last thread in the cgroup-init thread group is terminating.
@@ -172,7 +170,19 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 	read_lock(&tasklist_lock);
 	nr = next_pidmap(pid_ns, 1);
 	while (nr > 0) {
-		kill_proc_info(SIGKILL, SEND_SIG_PRIV, nr);
+		rcu_read_lock();
+
+		/*
+		 * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring
+		 * any nested-container's init processes don't ignore the
+		 * signal
+		 */
+		task = pid_task(find_vpid(nr), PIDTYPE_PID);
+		if (task)
+			force_sig(SIGKILL, task);
+
+		rcu_read_unlock();
+
 		nr = next_pidmap(pid_ns, nr);
 	}
 	read_unlock(&tasklist_lock);
@@ -182,9 +192,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 		rc = sys_wait4(-1, NULL, __WALL, NULL);
 	} while (rc != -ECHILD);
 
-
-	/* Child reaper for the pid namespace is going away */
-	pid_ns->child_reaper = NULL;
+	acct_exit_ns(pid_ns);
 	return;
 }