e3222c4ecc
sys_clone() and sys_unshare() both makes copies of nsproxy and its associated namespaces. But they have different code paths. This patch merges all the nsproxy and its associated namespace copy/clone handling (as much as possible). Posted on container list earlier for feedback. - Create a new nsproxy and its associated namespaces and pass it back to caller to attach it to right process. - Changed all copy_*_ns() routines to return a new copy of namespace instead of attaching it to task->nsproxy. - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines. - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON() just incase. - Get rid of all individual unshare_*_ns() routines and make use of copy_*_ns() instead. [akpm@osdl.org: cleanups, warning fix] [clg@fr.ibm.com: remove dup_namespaces() declaration] [serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval] [akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n] Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <containers@lists.osdl.org> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
#ifndef _LINUX_IPC_H
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#define _LINUX_IPC_H
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#include <linux/types.h>
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#define IPC_PRIVATE ((__kernel_key_t) 0)
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/* Obsolete, used only for backwards compatibility and libc5 compiles */
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struct ipc_perm
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{
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__kernel_key_t key;
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__kernel_uid_t uid;
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__kernel_gid_t gid;
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__kernel_uid_t cuid;
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__kernel_gid_t cgid;
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__kernel_mode_t mode;
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unsigned short seq;
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};
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/* Include the definition of ipc64_perm */
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#include <asm/ipcbuf.h>
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/* resource get request flags */
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#define IPC_CREAT 00001000 /* create if key is nonexistent */
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#define IPC_EXCL 00002000 /* fail if key exists */
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#define IPC_NOWAIT 00004000 /* return error on wait */
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/* these fields are used by the DIPC package so the kernel as standard
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should avoid using them if possible */
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#define IPC_DIPC 00010000 /* make it distributed */
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#define IPC_OWN 00020000 /* this machine is the DIPC owner */
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/*
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* Control commands used with semctl, msgctl and shmctl
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* see also specific commands in sem.h, msg.h and shm.h
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*/
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#define IPC_RMID 0 /* remove resource */
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#define IPC_SET 1 /* set ipc_perm options */
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#define IPC_STAT 2 /* get ipc_perm options */
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#define IPC_INFO 3 /* see ipcs */
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/*
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* Version flags for semctl, msgctl, and shmctl commands
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* These are passed as bitflags or-ed with the actual command
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*/
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#define IPC_OLD 0 /* Old version (no 32-bit UID support on many
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architectures) */
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#define IPC_64 0x0100 /* New version (support 32-bit UIDs, bigger
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message sizes, etc. */
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#ifdef __KERNEL__
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#include <linux/kref.h>
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#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
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/* used by in-kernel data structures */
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struct kern_ipc_perm
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{
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spinlock_t lock;
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int deleted;
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key_t key;
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uid_t uid;
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gid_t gid;
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uid_t cuid;
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gid_t cgid;
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mode_t mode;
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unsigned long seq;
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void *security;
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};
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struct ipc_ids;
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struct ipc_namespace {
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struct kref kref;
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struct ipc_ids *ids[3];
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int sem_ctls[4];
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int used_sems;
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int msg_ctlmax;
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int msg_ctlmnb;
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int msg_ctlmni;
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size_t shm_ctlmax;
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size_t shm_ctlall;
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int shm_ctlmni;
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int shm_tot;
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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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extern struct ipc_namespace *copy_ipcs(unsigned long flags,
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struct ipc_namespace *ns);
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#else
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#define INIT_IPC_NS(ns)
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static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
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struct ipc_namespace *ns)
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{
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return ns;
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}
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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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#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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#endif /* _LINUX_IPC_H */
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