Home » Mailing lists » Devel » [PATCH] IPC namespace
| [PATCH 2/6] IPC namespace - utils [message #3670 is a reply to message #3668] |
Fri, 09 June 2006 15:05   |
Kirill Korotaev
Messages: 137
Registered: January 2006
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Senior Member |
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This patch adds basic IPC namespace functionality to
IPC utils:
- init_ipc_ns
- copy/clone/unshare/free IPC ns
- /proc preparations
Signed-Off-By: Pavel Emelianov <xemul@openvz.org>
Signed-Off-By: Kirill Korotaev <dev@openvz.org>
--- ./ipc/util.c.ipcns 2006-05-18 12:05:15.000000000 +0400
+++ ./ipc/util.c 2006-06-09 14:19:30.000000000 +0400
@@ -12,6 +12,9 @@
* Mingming Cao <cmm@us.ibm.com>
* Mar 2006 - support for audit of ipc object properties
* Dustin Kirkland <dustin.kirkland@us.ibm.com>
+ * Jun 2006 - namespaces ssupport
+ * OpenVZ, SWsoft Inc.
+ * Pavel Emelianov <xemul@openvz.org>
*/
#include <linux/config.h>
@@ -30,6 +33,7 @@
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/audit.h>
+#include <linux/nsproxy.h>
#include <asm/unistd.h>
@@ -38,10 +42,126 @@
struct ipc_proc_iface {
const char *path;
const char *header;
- struct ipc_ids *ids;
+ int ids;
int (*show)(struct seq_file *, void *);
};
+struct ipc_namespace init_ipc_ns = {
+ .kref = {
+ .refcount = ATOMIC_INIT(2),
+ },
+};
+
+#ifdef CONFIG_IPC_NS
+static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
+{
+ int err;
+ struct ipc_namespace *ns;
+
+ err = -ENOMEM;
+ ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
+ if (ns == NULL)
+ goto err_mem;
+
+ err = sem_init_ns(ns);
+ if (err)
+ goto err_sem;
+ err = msg_init_ns(ns);
+ if (err)
+ goto err_msg;
+ err = shm_init_ns(ns);
+ if (err)
+ goto err_shm;
+
+ kref_init(&ns->kref);
+ return ns;
+
+err_shm:
+ msg_exit_ns(ns);
+err_msg:
+ sem_exit_ns(ns);
+err_sem:
+ kfree(ns);
+err_mem:
+ return ERR_PTR(err);
+}
+
+int unshare_ipcs(unsigned long unshare_flags, struct ipc_namespace **new_ipc)
+{
+ struct ipc_namespace *new;
+
+ if (unshare_flags & CLONE_NEWIPC) {
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ new = clone_ipc_ns(current->nsproxy->ipc_ns);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+
+ *new_ipc = new;
+ }
+
+ return 0;
+}
+
+int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{
+ struct ipc_namespace *old_ns = tsk->nsproxy->ipc_ns;
+ struct ipc_namespace *new_ns;
+ int err = 0;
+
+ if (!old_ns)
+ return 0;
+
+ get_ipc_ns(old_ns);
+
+ if (!(flags & CLONE_NEWIPC))
+ return 0;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ err = -EPERM;
+ goto out;
+ }
+
+ new_ns = clone_ipc_ns(old_ns);
+ if (!new_ns) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ tsk->nsproxy->ipc_ns = new_ns;
+out:
+ put_ipc_ns(old_ns);
+ return err;
+}
+
+void free_ipc_ns(struct kref *kref)
+{
+ struct ipc_namespace *ns;
+
+ ns = container_of(kref, struct ipc_namespace, kref);
+ sem_exit_ns(ns);
+ msg_exit_ns(ns);
+ shm_exit_ns(ns);
+ kfree(ns);
+}
+#else
+int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
+{
+ return -EINVAL;
+}
+
+int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{
+ return 0;
+}
+
+void free_ipc_ns(struct kref *kref)
+{
+ BUG(); /* init_ipc_ns should never be put */
+}
+#endif
+
/**
* ipc_init - initialise IPC subsystem
*
@@ -68,7 +188,7 @@ __initcall(ipc_init);
* array itself.
*/
-void __init ipc_init_ids(struct ipc_ids* ids, int size)
+void __ipc_init ipc_init_ids(struct ipc_ids* ids, int size)
{
int i;
@@ -111,8 +231,7 @@ static struct file_operations sysvipc_pr
* @show: show routine.
*/
void __init ipc_init_proc_interface(const char *path, const char *header,
- struct ipc_ids *ids,
- int (*show)(struct seq_file *, void *))
+ int ids, int (*show)(struct seq_file *, void *))
{
struct proc_dir_entry *pde;
struct ipc_proc_iface *iface;
@@ -636,6 +755,9 @@ static void *sysvipc_proc_next(struct se
struct ipc_proc_iface *iface = s->private;
struct kern_ipc_perm *ipc = it;
loff_t p;
+ struct ipc_ids *ids;
+
+ ids = current->nsproxy->ipc_ns->ids[iface->ids];
/* If we had an ipc id locked before, unlock it */
if (ipc && ipc != SEQ_START_TOKEN)
@@ -645,8 +767,8 @@ static void *sysvipc_proc_next(struct se
* p = *pos - 1 (because id 0 starts at position 1)
* + 1 (because we increment the position by one)
*/
- for (p = *pos; p <= iface->ids->max_id; p++) {
- if ((ipc = ipc_lock(iface->ids, p)) != NULL) {
+ for (p = *pos; p <= ids->max_id; p++) {
+ if ((ipc = ipc_lock(ids, p)) != NULL) {
*pos = p + 1;
return ipc;
}
@@ -665,12 +787,15 @@ static void *sysvipc_proc_start(struct s
struct ipc_proc_iface *iface = s->private;
struct kern_ipc_perm *ipc;
loff_t p;
+ struct ipc_ids *ids;
+
+ ids = current->nsproxy->ipc_ns->ids[iface->ids];
/*
* Take the lock - this will be released by the corresponding
* call to stop().
*/
- mutex_lock(&iface->ids->mutex);
+ mutex_lock(&ids->mutex);
/* pos < 0 is invalid */
if (*pos < 0)
@@ -681,8 +806,8 @@ static void *sysvipc_proc_start(struct s
return SEQ_START_TOKEN;
/* Find the (pos-1)th ipc */
- for (p = *pos - 1; p <= iface->ids->max_id; p++) {
- if ((ipc = ipc_lock(iface->ids, p)) != NULL) {
+ for (p = *pos - 1; p <= ids->max_id; p++) {
+ if ((ipc = ipc_lock(ids, p)) != NULL) {
*pos = p + 1;
return ipc;
}
@@ -694,13 +819,15 @@ static void sysvipc_proc_stop(struct seq
{
struct kern_ipc_perm *ipc = it;
struct ipc_proc_iface *iface = s->private;
+ struct ipc_ids *ids;
/* If we had a locked segment, release it */
if (ipc && ipc != SEQ_START_TOKEN)
ipc_unlock(ipc);
+ ids = current->nsproxy->ipc_ns->ids[iface->ids];
/* Release the lock we took in start() */
- mutex_unlock(&iface->ids->mutex);
+ mutex_unlock(&ids->mutex);
}
static int sysvipc_proc_show(struct seq_file *s, void *it)
--- ./ipc/util.h.ipcns 2006-04-21 11:59:36.000000000 +0400
+++ ./ipc/util.h 2006-06-09 14:24:40.000000000 +0400
@@ -3,6 +3,8 @@
* Copyright (C) 1999 Christoph Rohland
*
* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
+ * namespaces support. 2006 OpenVZ, SWsoft Inc.
+ * Pavel Emelianov <xemul@openvz.org>
*/
#ifndef _IPC_UTIL_H
@@ -15,6 +17,14 @@ void sem_init (void);
void msg_init (void);
void shm_init (void);
+int sem_init_ns(struct ipc_namespace *ns);
+int msg_init_ns(struct ipc_namespace *ns);
+int shm_init_ns(struct ipc_namespace *ns);
+
+void sem_exit_ns(struct ipc_namespace *ns);
+void msg_exit_ns(struct ipc_namespace *ns);
+void shm_exit_ns(struct ipc_namespace *ns);
+
struct ipc_id_ary {
int size;
struct kern_ipc_perm *p[0];
@@ -31,15 +41,23 @@ struct ipc_ids {
};
struct seq_file;
-void __init ipc_init_ids(struct ipc_ids* ids, int size);
+#ifdef CONFIG_IPC_NS
+#define __ipc_init
+#else
+#define __ipc_init __init
+#endif
+void __ipc_init ipc_init_ids(struct ipc_ids *ids, int size);
#ifdef CONFIG_PROC_FS
void __init ipc_init_proc_interface(const char *path, const char *header,
- struct ipc_ids *ids,
- int (*show)(struct seq_file *, void *));
+ int ids, int (*show)(struct seq_file *, void *));
#else
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
#endif
+#define IPC_SEM_IDS 0
+#define IPC_MSG_IDS 1
+#define IPC_SHM_IDS 2
+
/* must be called with ids->mutex acquired.*/
int ipc_findkey(struct ipc_ids* ids, key_t key);
int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
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