Release 4.17 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/cred.h>
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
#include <linux/sched/task.h>
static struct kmem_cache *uts_ns_cache __ro_after_init;
static struct ucounts *inc_uts_namespaces(struct user_namespace *ns)
{
return inc_ucount(ns, current_euid(), UCOUNT_UTS_NAMESPACES);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric W. Biedermann | 24 | 100.00% | 1 | 100.00% |
Total | 24 | 100.00% | 1 | 100.00% |
static void dec_uts_namespaces(struct ucounts *ucounts)
{
dec_ucount(ucounts, UCOUNT_UTS_NAMESPACES);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric W. Biedermann | 18 | 100.00% | 1 | 100.00% |
Total | 18 | 100.00% | 1 | 100.00% |
static struct uts_namespace *create_uts_ns(void)
{
struct uts_namespace *uts_ns;
uts_ns = kmem_cache_alloc(uts_ns_cache, GFP_KERNEL);
if (uts_ns)
kref_init(&uts_ns->kref);
return uts_ns;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexey Dobriyan | 39 | 100.00% | 2 | 100.00% |
Total | 39 | 100.00% | 2 | 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 allocate), new ns otherwise
*/
static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
struct uts_namespace *old_ns)
{
struct uts_namespace *ns;
struct ucounts *ucounts;
int err;
err = -ENOSPC;
ucounts = inc_uts_namespaces(user_ns);
if (!ucounts)
goto fail;
err = -ENOMEM;
ns = create_uts_ns();
if (!ns)
goto fail_dec;
err = ns_alloc_inum(&ns->ns);
if (err)
goto fail_free;
ns->ucounts = ucounts;
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;
fail_free:
kmem_cache_free(uts_ns_cache, ns);
fail_dec:
dec_uts_namespaces(ucounts);
fail:
return ERR_PTR(err);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric W. Biedermann | 80 | 47.34% | 4 | 28.57% |
Serge E. Hallyn | 60 | 35.50% | 3 | 21.43% |
Alexey Dobriyan | 17 | 10.06% | 3 | 21.43% |
Al Viro | 11 | 6.51% | 3 | 21.43% |
Cédric Le Goater | 1 | 0.59% | 1 | 7.14% |
Total | 169 | 100.00% | 14 | 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 E. Hallyn | 52 | 78.79% | 3 | 50.00% |
Eric W. Biedermann | 8 | 12.12% | 2 | 33.33% |
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);
dec_uts_namespaces(ns->ucounts);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
kmem_cache_free(uts_ns_cache, ns);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Serge E. Hallyn | 38 | 67.86% | 2 | 28.57% |
Eric W. Biedermann | 12 | 21.43% | 2 | 28.57% |
Al Viro | 3 | 5.36% | 2 | 28.57% |
Alexey Dobriyan | 3 | 5.36% | 1 | 14.29% |
Total | 56 | 100.00% | 7 | 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 | 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. Biedermann | 59 | 86.76% | 2 | 50.00% |
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. Biedermann | 14 | 73.68% | 1 | 33.33% |
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. Biedermann | 67 | 93.06% | 4 | 66.67% |
Al Viro | 5 | 6.94% | 2 | 33.33% |
Total | 72 | 100.00% | 6 | 100.00% |
static struct user_namespace *utsns_owner(struct ns_common *ns)
{
return to_uts_ns(ns)->user_ns;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Andrey Vagin | 21 | 100.00% | 1 | 100.00% |
Total | 21 | 100.00% | 1 | 100.00% |
const struct proc_ns_operations utsns_operations = {
.name = "uts",
.type = CLONE_NEWUTS,
.get = utsns_get,
.put = utsns_put,
.install = utsns_install,
.owner = utsns_owner,
};
void __init uts_ns_init(void)
{
uts_ns_cache = kmem_cache_create_usercopy(
"uts_namespace", sizeof(struct uts_namespace), 0,
SLAB_PANIC|SLAB_ACCOUNT,
offsetof(struct uts_namespace, name),
sizeof_field(struct uts_namespace, name),
NULL);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexey Dobriyan | 45 | 100.00% | 1 | 100.00% |
Total | 45 | 100.00% | 1 | 100.00% |
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric W. Biedermann | 316 | 45.40% | 10 | 33.33% |
Serge E. Hallyn | 164 | 23.56% | 4 | 13.33% |
Alexey Dobriyan | 112 | 16.09% | 3 | 10.00% |
Al Viro | 58 | 8.33% | 5 | 16.67% |
Andrey Vagin | 26 | 3.74% | 1 | 3.33% |
Badari Pulavarty | 7 | 1.01% | 1 | 3.33% |
Ingo Molnar | 6 | 0.86% | 2 | 6.67% |
Robert P. J. Day | 3 | 0.43% | 1 | 3.33% |
Cédric Le Goater | 2 | 0.29% | 1 | 3.33% |
David Howells | 1 | 0.14% | 1 | 3.33% |
Paul Gortmaker | 1 | 0.14% | 1 | 3.33% |
Total | 696 | 100.00% | 30 | 100.00% |
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