1 files changed, 46 insertions, 3 deletions

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 5a5cb45ac57e..7c67a5811199 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -8,7 +8,6 @@
 #include <linux/workqueue.h>
 #include <linux/threads.h>
 #include <linux/nsproxy.h>
-#include <linux/kref.h>
 #include <linux/ns_common.h>
 #include <linux/idr.h>
 
@@ -17,14 +16,21 @@
 
 struct fs_pin;
 
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
+/* modes for vm.memfd_noexec sysctl */
+#define MEMFD_NOEXEC_SCOPE_EXEC			0 /* MFD_EXEC implied if unset */
+#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL		1 /* MFD_NOEXEC_SEAL implied if unset */
+#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED	2 /* same as 1, except MFD_EXEC rejected */
+#endif
+
 struct pid_namespace {
-	struct kref kref;
 	struct idr idr;
 	struct rcu_head rcu;
 	unsigned int pid_allocated;
 	struct task_struct *child_reaper;
 	struct kmem_cache *pid_cachep;
 	unsigned int level;
+	int pid_max;
 	struct pid_namespace *parent;
 #ifdef CONFIG_BSD_PROCESS_ACCT
 	struct fs_pin *bacct;
@@ -33,6 +39,14 @@ struct pid_namespace {
 	struct ucounts *ucounts;
 	int reboot;	/* group exit code if this pidns was rebooted */
 	struct ns_common ns;
+	struct work_struct	work;
+#ifdef CONFIG_SYSCTL
+	struct ctl_table_set	set;
+	struct ctl_table_header *sysctls;
+#if defined(CONFIG_MEMFD_CREATE)
+	int memfd_noexec_scope;
+#endif
+#endif
 } __randomize_layout;
 
 extern struct pid_namespace init_pid_ns;
@@ -43,10 +57,27 @@ extern struct pid_namespace init_pid_ns;
 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
 {
 	if (ns != &init_pid_ns)
-		kref_get(&ns->kref);
+		refcount_inc(&ns->ns.count);
 	return ns;
 }
 
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
+static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
+{
+	int scope = MEMFD_NOEXEC_SCOPE_EXEC;
+
+	for (; ns; ns = ns->parent)
+		scope = max(scope, READ_ONCE(ns->memfd_noexec_scope));
+
+	return scope;
+}
+#else
+static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
+{
+	return 0;
+}
+#endif
+
 extern struct pid_namespace *copy_pid_ns(unsigned long flags,
 	struct user_namespace *user_ns, struct pid_namespace *ns);
 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
@@ -61,6 +92,11 @@ static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
 	return ns;
 }
 
+static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
+{
+	return 0;
+}
+
 static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
 	struct user_namespace *user_ns, struct pid_namespace *ns)
 {
@@ -87,5 +123,12 @@ static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
 void pidhash_init(void);
 void pid_idr_init(void);
+int register_pidns_sysctls(struct pid_namespace *pidns);
+void unregister_pidns_sysctls(struct pid_namespace *pidns);
+
+static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
+{
+	return task_active_pid_ns(tsk) == &init_pid_ns;
+}
 
 #endif /* _LINUX_PID_NS_H */