Blame view
kernel/utsname.c
2.5 KB
4865ecf13 [PATCH] namespace... |
1 2 3 4 5 6 7 8 9 10 |
/* * Copyright (C) 2004 IBM Corporation * * Author: Serge Hallyn <serue@us.ibm.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. */ |
9984de1a5 kernel: Map most ... |
11 |
#include <linux/export.h> |
4865ecf13 [PATCH] namespace... |
12 13 |
#include <linux/uts.h> #include <linux/utsname.h> |
467e9f4b5 fix create_new_na... |
14 |
#include <linux/err.h> |
1aeb272cf kernel: explicitl... |
15 |
#include <linux/slab.h> |
59607db36 userns: add a use... |
16 |
#include <linux/user_namespace.h> |
34482e89a ns proc: Add supp... |
17 |
#include <linux/proc_fs.h> |
4865ecf13 [PATCH] namespace... |
18 |
|
4c2a7e72d utsns: extract cr... |
19 20 21 22 23 24 25 26 27 |
static struct uts_namespace *create_uts_ns(void) { struct uts_namespace *uts_ns; uts_ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL); if (uts_ns) kref_init(&uts_ns->kref); return uts_ns; } |
4865ecf13 [PATCH] namespace... |
28 |
/* |
071df104f [PATCH] namespace... |
29 30 31 32 |
* Clone a new ns copying an original utsname, setting refcount to 1 * @old_ns: namespace to clone * Return NULL on error (failure to kmalloc), new ns otherwise */ |
bb96a6f50 userns: allow set... |
33 34 |
static struct uts_namespace *clone_uts_ns(struct task_struct *tsk, struct uts_namespace *old_ns) |
071df104f [PATCH] namespace... |
35 36 |
{ struct uts_namespace *ns; |
4c2a7e72d utsns: extract cr... |
37 |
ns = create_uts_ns(); |
467e9f4b5 fix create_new_na... |
38 39 |
if (!ns) return ERR_PTR(-ENOMEM); |
efc63c4fb Fix UTS corruptio... |
40 |
down_read(&uts_sem); |
467e9f4b5 fix create_new_na... |
41 |
memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); |
bb96a6f50 userns: allow set... |
42 |
ns->user_ns = get_user_ns(task_cred_xxx(tsk, user)->user_ns); |
efc63c4fb Fix UTS corruptio... |
43 |
up_read(&uts_sem); |
071df104f [PATCH] namespace... |
44 45 46 47 |
return ns; } /* |
4865ecf13 [PATCH] namespace... |
48 49 50 51 52 |
* Copy task tsk's utsname namespace, or clone it if flags * specifies CLONE_NEWUTS. In latter case, changes to the * utsname of this process won't be seen by parent, and vice * versa. */ |
bb96a6f50 userns: allow set... |
53 54 |
struct uts_namespace *copy_utsname(unsigned long flags, struct task_struct *tsk) |
4865ecf13 [PATCH] namespace... |
55 |
{ |
bb96a6f50 userns: allow set... |
56 |
struct uts_namespace *old_ns = tsk->nsproxy->uts_ns; |
071df104f [PATCH] namespace... |
57 |
struct uts_namespace *new_ns; |
4865ecf13 [PATCH] namespace... |
58 |
|
e3222c4ec Merge sys_clone()... |
59 |
BUG_ON(!old_ns); |
4865ecf13 [PATCH] namespace... |
60 |
get_uts_ns(old_ns); |
071df104f [PATCH] namespace... |
61 |
if (!(flags & CLONE_NEWUTS)) |
e3222c4ec Merge sys_clone()... |
62 |
return old_ns; |
071df104f [PATCH] namespace... |
63 |
|
bb96a6f50 userns: allow set... |
64 |
new_ns = clone_uts_ns(tsk, old_ns); |
071df104f [PATCH] namespace... |
65 |
|
071df104f [PATCH] namespace... |
66 |
put_uts_ns(old_ns); |
e3222c4ec Merge sys_clone()... |
67 |
return new_ns; |
4865ecf13 [PATCH] namespace... |
68 69 70 71 72 73 74 |
} void free_uts_ns(struct kref *kref) { struct uts_namespace *ns; ns = container_of(kref, struct uts_namespace, kref); |
59607db36 userns: add a use... |
75 |
put_user_ns(ns->user_ns); |
4865ecf13 [PATCH] namespace... |
76 77 |
kfree(ns); } |
34482e89a ns proc: Add supp... |
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 |
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, }; |