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Commit 34482e89 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

ns proc: Add support for the uts namespace 



Acked-by: default avatarDaniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
parent 13b6f576

fs/proc/namespaces.c

+3 −0
Original line number Diff line number Diff line
@@ -19,6 +19,9 @@ static const struct proc_ns_operations *ns_entries[] = { 
#ifdef CONFIG_NET_NS

	&netns_operations,

#endif

#ifdef CONFIG_UTS_NS

	&utsns_operations,

#endif

};



static const struct file_operations ns_file_operations = {

include/linux/proc_fs.h

+1 −0
Original line number Diff line number Diff line
@@ -266,6 +266,7 @@ struct proc_ns_operations { 
	int (*install)(struct nsproxy *nsproxy, void *ns);

};

extern const struct proc_ns_operations netns_operations;

extern const struct proc_ns_operations utsns_operations;



union proc_op {

	int (*proc_get_link)(struct inode *, struct path *);

kernel/utsname.c

+39 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/err.h>

#include <linux/slab.h>

#include <linux/user_namespace.h>

#include <linux/proc_fs.h>



static struct uts_namespace *create_uts_ns(void)

{
@@ -79,3 +80,41 @@ void free_uts_ns(struct kref *kref) 
	put_user_ns(ns->user_ns);

	kfree(ns);

}



static void *utsns_get(struct task_struct *task)

{

	struct uts_namespace *ns = NULL;

	struct nsproxy *nsproxy;



	rcu_read_lock();

	nsproxy = task_nsproxy(task);

	if (nsproxy) {

		ns = nsproxy->uts_ns;

		get_uts_ns(ns);

	}

	rcu_read_unlock();



	return ns;

}



static void utsns_put(void *ns)

{

	put_uts_ns(ns);

}



static int utsns_install(struct nsproxy *nsproxy, void *ns)

{

	get_uts_ns(ns);

	put_uts_ns(nsproxy->uts_ns);

	nsproxy->uts_ns = ns;

	return 0;

}



const struct proc_ns_operations utsns_operations = {

	.name		= "uts",

	.type		= CLONE_NEWUTS,

	.get		= utsns_get,

	.put		= utsns_put,

	.install	= utsns_install,

};