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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - kernel/utsname.c
2 * Copyright (C) 2004 IBM Corporation
4 * Author: Serge Hallyn <serue@us.ibm.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
12 #include <linux/module.h>
13 #include <linux/uts.h>
14 #include <linux/utsname.h>
15 #include <linux/err.h>
16 #include <linux/slab.h>
17 #include <linux/user_namespace.h>
19 static struct uts_namespace
*create_uts_ns(void)
21 struct uts_namespace
*uts_ns
;
23 uts_ns
= kmalloc(sizeof(struct uts_namespace
), GFP_KERNEL
);
25 kref_init(&uts_ns
->kref
);
30 * Clone a new ns copying an original utsname, setting refcount to 1
31 * @old_ns: namespace to clone
32 * Return NULL on error (failure to kmalloc), new ns otherwise
34 static struct uts_namespace
*clone_uts_ns(struct task_struct
*tsk
,
35 struct uts_namespace
*old_ns
)
37 struct uts_namespace
*ns
;
41 return ERR_PTR(-ENOMEM
);
44 memcpy(&ns
->name
, &old_ns
->name
, sizeof(ns
->name
));
45 ns
->user_ns
= get_user_ns(task_cred_xxx(tsk
, user
)->user_ns
);
51 * Copy task tsk's utsname namespace, or clone it if flags
52 * specifies CLONE_NEWUTS. In latter case, changes to the
53 * utsname of this process won't be seen by parent, and vice
56 struct uts_namespace
*copy_utsname(unsigned long flags
,
57 struct task_struct
*tsk
)
59 struct uts_namespace
*old_ns
= tsk
->nsproxy
->uts_ns
;
60 struct uts_namespace
*new_ns
;
65 if (!(flags
& CLONE_NEWUTS
))
68 new_ns
= clone_uts_ns(tsk
, old_ns
);
74 void free_uts_ns(struct kref
*kref
)
76 struct uts_namespace
*ns
;
78 ns
= container_of(kref
, struct uts_namespace
, kref
);
79 put_user_ns(ns
->user_ns
);