Release 4.7 kernel/utsname.c
/*
* 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.
*/
#include <linux/export.h>
#include <linux/uts.h>
#include <linux/utsname.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexey dobriyan | alexey dobriyan | 43 | 100.00% | 1 | 100.00% |
| Total | 43 | 100.00% | 1 | 100.00% |
/*
* Clone a new ns copying an original utsname, setting refcount to 1
* @old_ns: namespace to clone
* Return ERR_PTR(-ENOMEM) on error (failure to kmalloc), new ns otherwise
*/
static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
struct uts_namespace *old_ns)
{
struct uts_namespace *ns;
int err;
ns = create_uts_ns();
if (!ns)
return ERR_PTR(-ENOMEM);
err = ns_alloc_inum(&ns->ns);
if (err) {
kfree(ns);
return ERR_PTR(err);
}
ns->ns.ops = &utsns_operations;
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
ns->user_ns = get_user_ns(user_ns);
up_read(&uts_sem);
return ns;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| serge hallyn | serge hallyn | 60 | 48.78% | 3 | 27.27% |
| eric w. biederman | eric w. biederman | 30 | 24.39% | 2 | 18.18% |
| alexey dobriyan | alexey dobriyan | 14 | 11.38% | 2 | 18.18% |
| al viro | al viro | 11 | 8.94% | 3 | 27.27% |
| cedric le goater | cedric le goater | 8 | 6.50% | 1 | 9.09% |
| Total | 123 | 100.00% | 11 | 100.00% |
/*
* 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.
*/
struct uts_namespace *copy_utsname(unsigned long flags,
struct user_namespace *user_ns, struct uts_namespace *old_ns)
{
struct uts_namespace *new_ns;
BUG_ON(!old_ns);
get_uts_ns(old_ns);
if (!(flags & CLONE_NEWUTS))
return old_ns;
new_ns = clone_uts_ns(user_ns, old_ns);
put_uts_ns(old_ns);
return new_ns;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| serge hallyn | serge hallyn | 52 | 78.79% | 3 | 50.00% |
| eric w. biederman | eric w. biederman | 8 | 12.12% | 2 | 33.33% |
| badari pulavarty | badari pulavarty | 6 | 9.09% | 1 | 16.67% |
| Total | 66 | 100.00% | 6 | 100.00% |
void free_uts_ns(struct kref *kref)
{
struct uts_namespace *ns;
ns = container_of(kref, struct uts_namespace, kref);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
kfree(ns);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| serge hallyn | serge hallyn | 39 | 82.98% | 2 | 40.00% |
| eric w. biederman | eric w. biederman | 5 | 10.64% | 1 | 20.00% |
| al viro | al viro | 3 | 6.38% | 2 | 40.00% |
| Total | 47 | 100.00% | 5 | 100.00% |
static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
{
return container_of(ns, struct uts_namespace, ns);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| al viro | al viro | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
static struct ns_common *utsns_get(struct task_struct *task)
{
struct uts_namespace *ns = NULL;
struct nsproxy *nsproxy;
task_lock(task);
nsproxy = task->nsproxy;
if (nsproxy) {
ns = nsproxy->uts_ns;
get_uts_ns(ns);
}
task_unlock(task);
return ns ? &ns->ns : NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 59 | 86.76% | 2 | 50.00% |
| al viro | al viro | 9 | 13.24% | 2 | 50.00% |
| Total | 68 | 100.00% | 4 | 100.00% |
static void utsns_put(struct ns_common *ns)
{
put_uts_ns(to_uts_ns(ns));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 14 | 73.68% | 1 | 33.33% |
| al viro | al viro | 5 | 26.32% | 2 | 66.67% |
| Total | 19 | 100.00% | 3 | 100.00% |
static int utsns_install(struct nsproxy *nsproxy, struct ns_common *new)
{
struct uts_namespace *ns = to_uts_ns(new);
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
!ns_capable(current_user_ns(), CAP_SYS_ADMIN))
return -EPERM;
get_uts_ns(ns);
put_uts_ns(nsproxy->uts_ns);
nsproxy->uts_ns = ns;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 67 | 93.06% | 4 | 66.67% |
| al viro | al viro | 5 | 6.94% | 2 | 33.33% |
| Total | 72 | 100.00% | 6 | 100.00% |
const struct proc_ns_operations utsns_operations = {
.name = "uts",
.type = CLONE_NEWUTS,
.get = utsns_get,
.put = utsns_put,
.install = utsns_install,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 217 | 41.81% | 8 | 32.00% |
| serge hallyn | serge hallyn | 165 | 31.79% | 4 | 16.00% |
| al viro | al viro | 58 | 11.18% | 5 | 20.00% |
| alexey dobriyan | alexey dobriyan | 57 | 10.98% | 2 | 8.00% |
| cedric le goater | cedric le goater | 9 | 1.73% | 1 | 4.00% |
| badari pulavarty | badari pulavarty | 7 | 1.35% | 1 | 4.00% |
| robert p. j. day | robert p. j. day | 3 | 0.58% | 1 | 4.00% |
| david howells | david howells | 1 | 0.19% | 1 | 4.00% |
| paul gortmaker | paul gortmaker | 1 | 0.19% | 1 | 4.00% |
| yuanhan liu | yuanhan liu | 1 | 0.19% | 1 | 4.00% |
| Total | 519 | 100.00% | 25 | 100.00% |
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