Release 4.7 ipc/namespace.c
/*
* linux/ipc/namespace.c
* Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
*/
#include <linux/ipc.h>
#include <linux/msg.h>
#include <linux/ipc_namespace.h>
#include <linux/rcupdate.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
#include "util.h"
static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
struct ipc_namespace *old_ns)
{
struct ipc_namespace *ns;
int err;
ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
if (ns == NULL)
return ERR_PTR(-ENOMEM);
err = ns_alloc_inum(&ns->ns);
if (err) {
kfree(ns);
return ERR_PTR(err);
}
ns->ns.ops = &ipcns_operations;
atomic_set(&ns->count, 1);
err = mq_init_ns(ns);
if (err) {
ns_free_inum(&ns->ns);
kfree(ns);
return ERR_PTR(err);
}
atomic_inc(&nr_ipc_ns);
sem_init_ns(ns);
msg_init_ns(ns);
shm_init_ns(ns);
ns->user_ns = get_user_ns(user_ns);
return ns;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| serge hallyn | serge hallyn | 53 | 32.52% | 3 | 25.00% |
| pavel emelianov | pavel emelianov | 50 | 30.67% | 1 | 8.33% |
| eric w. biederman | eric w. biederman | 32 | 19.63% | 2 | 16.67% |
| al viro | al viro | 14 | 8.59% | 3 | 25.00% |
| pierre peiffer | pierre peiffer | 7 | 4.29% | 1 | 8.33% |
| nadia derbey | nadia derbey | 6 | 3.68% | 1 | 8.33% |
| alexey dobriyan | alexey dobriyan | 1 | 0.61% | 1 | 8.33% |
| Total | 163 | 100.00% | 12 | 100.00% |
struct ipc_namespace *copy_ipcs(unsigned long flags,
struct user_namespace *user_ns, struct ipc_namespace *ns)
{
if (!(flags & CLONE_NEWIPC))
return get_ipc_ns(ns);
return create_ipc_ns(user_ns, ns);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pavel emelianov | pavel emelianov | 26 | 59.09% | 1 | 16.67% |
| serge hallyn | serge hallyn | 8 | 18.18% | 2 | 33.33% |
| eric w. biederman | eric w. biederman | 6 | 13.64% | 1 | 16.67% |
| alexey dobriyan | alexey dobriyan | 4 | 9.09% | 2 | 33.33% |
| Total | 44 | 100.00% | 6 | 100.00% |
/*
* free_ipcs - free all ipcs of one type
* @ns: the namespace to remove the ipcs from
* @ids: the table of ipcs to free
* @free: the function called to free each individual ipc
*
* Called for each kind of ipc when an ipc_namespace exits.
*/
void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
{
struct kern_ipc_perm *perm;
int next_id;
int total, in_use;
down_write(&ids->rwsem);
in_use = ids->in_use;
for (total = 0, next_id = 0; total < in_use; next_id++) {
perm = idr_find(&ids->ipcs_idr, next_id);
if (perm == NULL)
continue;
rcu_read_lock();
ipc_lock_object(perm);
free(ns, perm);
total++;
}
up_write(&ids->rwsem);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pierre peiffer | pierre peiffer | 115 | 95.04% | 1 | 33.33% |
| davidlohr bueso | davidlohr bueso | 6 | 4.96% | 2 | 66.67% |
| Total | 121 | 100.00% | 3 | 100.00% |
static void free_ipc_ns(struct ipc_namespace *ns)
{
sem_exit_ns(ns);
msg_exit_ns(ns);
shm_exit_ns(ns);
atomic_dec(&nr_ipc_ns);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
kfree(ns);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| serge hallyn | serge hallyn | 17 | 32.69% | 2 | 25.00% |
| alexey dobriyan | alexey dobriyan | 12 | 23.08% | 1 | 12.50% |
| pavel emelianov | pavel emelianov | 10 | 19.23% | 1 | 12.50% |
| eric w. biederman | eric w. biederman | 5 | 9.62% | 1 | 12.50% |
| xiaotian feng | xiaotian feng | 5 | 9.62% | 1 | 12.50% |
| al viro | al viro | 3 | 5.77% | 2 | 25.00% |
| Total | 52 | 100.00% | 8 | 100.00% |
/*
* put_ipc_ns - drop a reference to an ipc namespace.
* @ns: the namespace to put
*
* If this is the last task in the namespace exiting, and
* it is dropping the refcount to 0, then it can race with
* a task in another ipc namespace but in a mounts namespace
* which has this ipcns's mqueuefs mounted, doing some action
* with one of the mqueuefs files. That can raise the refcount.
* So dropping the refcount, and raising the refcount when
* accessing it through the VFS, are protected with mq_lock.
*
* (Clearly, a task raising the refcount on its own ipc_ns
* needn't take mq_lock since it can't race with the last task
* in the ipcns exiting).
*/
void put_ipc_ns(struct ipc_namespace *ns)
{
if (atomic_dec_and_lock(&ns->count, &mq_lock)) {
mq_clear_sbinfo(ns);
spin_unlock(&mq_lock);
mq_put_mnt(ns);
free_ipc_ns(ns);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexey dobriyan | alexey dobriyan | 19 | 41.30% | 1 | 25.00% |
| pavel emelianov | pavel emelianov | 16 | 34.78% | 1 | 25.00% |
| serge hallyn | serge hallyn | 8 | 17.39% | 1 | 25.00% |
| nadia derbey | nadia derbey | 3 | 6.52% | 1 | 25.00% |
| Total | 46 | 100.00% | 4 | 100.00% |
static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns)
{
return container_of(ns, struct ipc_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 *ipcns_get(struct task_struct *task)
{
struct ipc_namespace *ns = NULL;
struct nsproxy *nsproxy;
task_lock(task);
nsproxy = task->nsproxy;
if (nsproxy)
ns = get_ipc_ns(nsproxy->ipc_ns);
task_unlock(task);
return ns ? &ns->ns : NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 55 | 85.94% | 2 | 50.00% |
| al viro | al viro | 9 | 14.06% | 2 | 50.00% |
| Total | 64 | 100.00% | 4 | 100.00% |
static void ipcns_put(struct ns_common *ns)
{
return put_ipc_ns(to_ipc_ns(ns));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 15 | 75.00% | 1 | 33.33% |
| al viro | al viro | 5 | 25.00% | 2 | 66.67% |
| Total | 20 | 100.00% | 3 | 100.00% |
static int ipcns_install(struct nsproxy *nsproxy, struct ns_common *new)
{
struct ipc_namespace *ns = to_ipc_ns(new);
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
!ns_capable(current_user_ns(), CAP_SYS_ADMIN))
return -EPERM;
/* Ditch state from the old ipc namespace */
exit_sem(current);
put_ipc_ns(nsproxy->ipc_ns);
nsproxy->ipc_ns = get_ipc_ns(ns);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 71 | 93.42% | 4 | 66.67% |
| al viro | al viro | 5 | 6.58% | 2 | 33.33% |
| Total | 76 | 100.00% | 6 | 100.00% |
const struct proc_ns_operations ipcns_operations = {
.name = "ipc",
.type = CLONE_NEWIPC,
.get = ipcns_get,
.put = ipcns_put,
.install = ipcns_install,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric w. biederman | eric w. biederman | 218 | 32.11% | 7 | 25.93% |
| pavel emelianov | pavel emelianov | 124 | 18.26% | 1 | 3.70% |
| pierre peiffer | pierre peiffer | 123 | 18.11% | 2 | 7.41% |
| serge hallyn | serge hallyn | 95 | 13.99% | 3 | 11.11% |
| al viro | al viro | 61 | 8.98% | 5 | 18.52% |
| alexey dobriyan | alexey dobriyan | 37 | 5.45% | 3 | 11.11% |
| nadia derbey | nadia derbey | 9 | 1.33% | 2 | 7.41% |
| davidlohr bueso | davidlohr bueso | 6 | 0.88% | 2 | 7.41% |
| xiaotian feng | xiaotian feng | 5 | 0.74% | 1 | 3.70% |
| david howells | david howells | 1 | 0.15% | 1 | 3.70% |
| Total | 679 | 100.00% | 27 | 100.00% |
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