mirror of https://gitee.com/openkylin/linux.git
[PATCH] IPC namespace - utils
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> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kirill Korotaev
Linus Torvalds
parent
25b21cb2f6
commit
73ea41302b
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@ -6,6 +6,7 @@
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#include <linux/irqflags.h>
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#include <linux/utsname.h>
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#include <linux/lockdep.h>
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#include <linux/ipc.h>
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#define INIT_FDTABLE \
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{ \
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@ -74,8 +75,8 @@ extern struct nsproxy init_nsproxy;
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.count = ATOMIC_INIT(1), \
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.nslock = SPIN_LOCK_UNLOCKED, \
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.uts_ns = &init_uts_ns, \
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.ipc_ns = &init_ipc_ns, \
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.namespace = NULL, \
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INIT_IPC_NS(ipc_ns) \
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}
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#define INIT_SIGHAND(sighand) { \
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@ -88,20 +88,38 @@ struct ipc_namespace {
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};
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extern struct ipc_namespace init_ipc_ns;
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#ifdef CONFIG_SYSVIPC
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#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
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#else
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#define INIT_IPC_NS(ns)
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#endif
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#ifdef CONFIG_IPC_NS
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extern void free_ipc_ns(struct kref *kref);
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extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
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extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
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#else
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static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
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{
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return 0;
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}
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#endif
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static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
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{
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#ifdef CONFIG_IPC_NS
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if (ns)
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kref_get(&ns->kref);
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#endif
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return ns;
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}
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static inline void put_ipc_ns(struct ipc_namespace *ns)
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{
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#ifdef CONFIG_IPC_NS
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kref_put(&ns->kref, free_ipc_ns);
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#endif
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}
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#endif /* __KERNEL__ */
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132
ipc/util.c
132
ipc/util.c
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@ -12,6 +12,9 @@
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* Mingming Cao <cmm@us.ibm.com>
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* Mar 2006 - support for audit of ipc object properties
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* Dustin Kirkland <dustin.kirkland@us.ibm.com>
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* Jun 2006 - namespaces ssupport
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* OpenVZ, SWsoft Inc.
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* Pavel Emelianov <xemul@openvz.org>
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*/
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#include <linux/mm.h>
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@ -29,6 +32,7 @@
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/audit.h>
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#include <linux/nsproxy.h>
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#include <asm/unistd.h>
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@ -37,10 +41,111 @@
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struct ipc_proc_iface {
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const char *path;
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const char *header;
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struct ipc_ids *ids;
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int ids;
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int (*show)(struct seq_file *, void *);
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};
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struct ipc_namespace init_ipc_ns = {
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.kref = {
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.refcount = ATOMIC_INIT(2),
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},
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};
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#ifdef CONFIG_IPC_NS
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static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
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{
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int err;
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struct ipc_namespace *ns;
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err = -ENOMEM;
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ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
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if (ns == NULL)
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goto err_mem;
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err = sem_init_ns(ns);
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if (err)
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goto err_sem;
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err = msg_init_ns(ns);
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if (err)
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goto err_msg;
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err = shm_init_ns(ns);
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if (err)
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goto err_shm;
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kref_init(&ns->kref);
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return ns;
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err_shm:
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msg_exit_ns(ns);
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err_msg:
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sem_exit_ns(ns);
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err_sem:
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kfree(ns);
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err_mem:
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return ERR_PTR(err);
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}
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int unshare_ipcs(unsigned long unshare_flags, struct ipc_namespace **new_ipc)
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{
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struct ipc_namespace *new;
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if (unshare_flags & CLONE_NEWIPC) {
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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new = clone_ipc_ns(current->nsproxy->ipc_ns);
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if (IS_ERR(new))
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return PTR_ERR(new);
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*new_ipc = new;
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}
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return 0;
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}
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int copy_ipcs(unsigned long flags, struct task_struct *tsk)
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{
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struct ipc_namespace *old_ns = tsk->nsproxy->ipc_ns;
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struct ipc_namespace *new_ns;
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int err = 0;
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if (!old_ns)
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return 0;
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get_ipc_ns(old_ns);
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if (!(flags & CLONE_NEWIPC))
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return 0;
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if (!capable(CAP_SYS_ADMIN)) {
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err = -EPERM;
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goto out;
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}
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new_ns = clone_ipc_ns(old_ns);
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if (!new_ns) {
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err = -ENOMEM;
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goto out;
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}
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tsk->nsproxy->ipc_ns = new_ns;
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out:
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put_ipc_ns(old_ns);
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return err;
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}
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void free_ipc_ns(struct kref *kref)
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{
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struct ipc_namespace *ns;
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ns = container_of(kref, struct ipc_namespace, kref);
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sem_exit_ns(ns);
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msg_exit_ns(ns);
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shm_exit_ns(ns);
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kfree(ns);
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}
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#endif
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/**
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* ipc_init - initialise IPC subsystem
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*
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@ -67,7 +172,7 @@ __initcall(ipc_init);
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* array itself.
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*/
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void __init ipc_init_ids(struct ipc_ids* ids, int size)
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void __ipc_init ipc_init_ids(struct ipc_ids* ids, int size)
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{
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int i;
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@ -110,8 +215,7 @@ static struct file_operations sysvipc_proc_fops;
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* @show: show routine.
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*/
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void __init ipc_init_proc_interface(const char *path, const char *header,
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struct ipc_ids *ids,
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int (*show)(struct seq_file *, void *))
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int ids, int (*show)(struct seq_file *, void *))
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{
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struct proc_dir_entry *pde;
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struct ipc_proc_iface *iface;
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@ -635,6 +739,9 @@ static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
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struct ipc_proc_iface *iface = s->private;
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struct kern_ipc_perm *ipc = it;
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loff_t p;
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struct ipc_ids *ids;
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ids = current->nsproxy->ipc_ns->ids[iface->ids];
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/* If we had an ipc id locked before, unlock it */
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if (ipc && ipc != SEQ_START_TOKEN)
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@ -644,8 +751,8 @@ static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
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* p = *pos - 1 (because id 0 starts at position 1)
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* + 1 (because we increment the position by one)
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*/
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for (p = *pos; p <= iface->ids->max_id; p++) {
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if ((ipc = ipc_lock(iface->ids, p)) != NULL) {
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for (p = *pos; p <= ids->max_id; p++) {
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if ((ipc = ipc_lock(ids, p)) != NULL) {
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*pos = p + 1;
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return ipc;
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}
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@ -664,12 +771,15 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
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struct ipc_proc_iface *iface = s->private;
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struct kern_ipc_perm *ipc;
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loff_t p;
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struct ipc_ids *ids;
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ids = current->nsproxy->ipc_ns->ids[iface->ids];
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/*
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* Take the lock - this will be released by the corresponding
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* call to stop().
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*/
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mutex_lock(&iface->ids->mutex);
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mutex_lock(&ids->mutex);
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/* pos < 0 is invalid */
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if (*pos < 0)
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@ -680,8 +790,8 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
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return SEQ_START_TOKEN;
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/* Find the (pos-1)th ipc */
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for (p = *pos - 1; p <= iface->ids->max_id; p++) {
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if ((ipc = ipc_lock(iface->ids, p)) != NULL) {
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for (p = *pos - 1; p <= ids->max_id; p++) {
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if ((ipc = ipc_lock(ids, p)) != NULL) {
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*pos = p + 1;
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return ipc;
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}
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@ -693,13 +803,15 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it)
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{
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struct kern_ipc_perm *ipc = it;
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struct ipc_proc_iface *iface = s->private;
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struct ipc_ids *ids;
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/* If we had a locked segment, release it */
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if (ipc && ipc != SEQ_START_TOKEN)
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ipc_unlock(ipc);
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ids = current->nsproxy->ipc_ns->ids[iface->ids];
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/* Release the lock we took in start() */
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mutex_unlock(&iface->ids->mutex);
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mutex_unlock(&ids->mutex);
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}
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static int sysvipc_proc_show(struct seq_file *s, void *it)
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24
ipc/util.h
24
ipc/util.h
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@ -3,6 +3,8 @@
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* Copyright (C) 1999 Christoph Rohland
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*
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* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
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* namespaces support. 2006 OpenVZ, SWsoft Inc.
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* Pavel Emelianov <xemul@openvz.org>
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*/
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#ifndef _IPC_UTIL_H
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@ -15,6 +17,14 @@ void sem_init (void);
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void msg_init (void);
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void shm_init (void);
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int sem_init_ns(struct ipc_namespace *ns);
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int msg_init_ns(struct ipc_namespace *ns);
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int shm_init_ns(struct ipc_namespace *ns);
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void sem_exit_ns(struct ipc_namespace *ns);
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void msg_exit_ns(struct ipc_namespace *ns);
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void shm_exit_ns(struct ipc_namespace *ns);
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struct ipc_id_ary {
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int size;
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struct kern_ipc_perm *p[0];
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@ -31,15 +41,23 @@ struct ipc_ids {
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};
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struct seq_file;
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void __init ipc_init_ids(struct ipc_ids* ids, int size);
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#ifdef CONFIG_IPC_NS
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#define __ipc_init
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#else
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#define __ipc_init __init
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#endif
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void __ipc_init ipc_init_ids(struct ipc_ids *ids, int size);
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#ifdef CONFIG_PROC_FS
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void __init ipc_init_proc_interface(const char *path, const char *header,
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struct ipc_ids *ids,
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int (*show)(struct seq_file *, void *));
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int ids, int (*show)(struct seq_file *, void *));
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#else
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#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
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#endif
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#define IPC_SEM_IDS 0
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#define IPC_MSG_IDS 1
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#define IPC_SHM_IDS 2
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/* must be called with ids->mutex acquired.*/
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int ipc_findkey(struct ipc_ids* ids, key_t key);
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int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
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@ -1589,6 +1589,16 @@ static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **n
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return 0;
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}
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#ifndef CONFIG_IPC_NS
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static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
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{
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if (flags & CLONE_NEWIPC)
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return -EINVAL;
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return 0;
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}
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#endif
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/*
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* unshare allows a process to 'unshare' part of the process
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* context which was originally shared using clone. copy_*
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