Unverified Commit d2afdb73 authored by Christian Brauner's avatar Christian Brauner
Browse files

nsfs: add current_in_namespace() 



Add a helper to easily check whether a given namespace is the caller's
current namespace. This is currently open-coded in a lot of places.
Simply switch on the type and compare the results.

Reviewed-by: default avatarAleksa Sarai <cyphar@cyphar.com>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent d7afdf88

include/linux/nsfs.h

+15 −1
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 
#define _LINUX_NSFS_H



#include <linux/ns_common.h>

#include <linux/cred.h>

#include <linux/pid_namespace.h>



struct path;

struct task_struct;
@@ -22,5 +24,17 @@ int ns_get_name(char *buf, size_t size, struct task_struct *task, 
			const struct proc_ns_operations *ns_ops);

void nsfs_init(void);



#endif /* _LINUX_NSFS_H */

#define __current_namespace_from_type(__ns)				\

	_Generic((__ns),						\

		struct cgroup_namespace *: current->nsproxy->cgroup_ns,	\

		struct ipc_namespace *:    current->nsproxy->ipc_ns,	\

		struct net *:              current->nsproxy->net_ns,	\

		struct pid_namespace *:    task_active_pid_ns(current),	\

		struct mnt_namespace *:    current->nsproxy->mnt_ns,	\

		struct time_namespace *:   current->nsproxy->time_ns,	\

		struct user_namespace *:   current_user_ns(),		\

		struct uts_namespace *:    current->nsproxy->uts_ns)



#define current_in_namespace(__ns) (__current_namespace_from_type(__ns) == __ns)



#endif /* _LINUX_NSFS_H */