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ipc/msg.c
31.6 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/ipc/msg.c |
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* Copyright (C) 1992 Krishna Balasubramanian |
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* * Removed all the remaining kerneld mess * Catch the -EFAULT stuff properly * Use GFP_KERNEL for messages as in 1.2 * Fixed up the unchecked user space derefs * Copyright (C) 1998 Alan Cox & Andi Kleen * * /proc/sysvipc/msg support (c) 1999 Dragos Acostachioaie <dragos@iname.com> * * mostly rewritten, threaded and wake-one semantics added * MSGMAX limit removed, sysctl's added |
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* (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
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* * support for audit of ipc object properties and permission changes * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
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* * namespaces support * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
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*/ |
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#include <linux/capability.h> |
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#include <linux/msg.h> #include <linux/spinlock.h> #include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/proc_fs.h> #include <linux/list.h> #include <linux/security.h> |
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#include <linux/sched/wake_q.h> |
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#include <linux/syscalls.h> #include <linux/audit.h> |
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#include <linux/seq_file.h> |
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#include <linux/rwsem.h> |
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#include <linux/nsproxy.h> |
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#include <linux/ipc_namespace.h> |
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#include <linux/rhashtable.h> |
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|
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#include <asm/current.h> |
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#include <linux/uaccess.h> |
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#include "util.h" |
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/* one msq_queue structure for each present queue on the system */ struct msg_queue { struct kern_ipc_perm q_perm; time64_t q_stime; /* last msgsnd time */ time64_t q_rtime; /* last msgrcv time */ time64_t q_ctime; /* last change time */ unsigned long q_cbytes; /* current number of bytes on queue */ unsigned long q_qnum; /* number of messages in queue */ unsigned long q_qbytes; /* max number of bytes on queue */ |
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struct pid *q_lspid; /* pid of last msgsnd */ struct pid *q_lrpid; /* last receive pid */ |
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struct list_head q_messages; struct list_head q_receivers; struct list_head q_senders; } __randomize_layout; |
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/* * MSG_BARRIER Locking: * * Similar to the optimization used in ipc/mqueue.c, one syscall return path * does not acquire any locks when it sees that a message exists in * msg_receiver.r_msg. Therefore r_msg is set using smp_store_release() * and accessed using READ_ONCE()+smp_acquire__after_ctrl_dep(). In addition, * wake_q_add_safe() is used. See ipc/mqueue.c for more details */ |
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/* one msg_receiver structure for each sleeping receiver */ |
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struct msg_receiver { |
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struct list_head r_list; struct task_struct *r_tsk; |
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|
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int r_mode; long r_msgtype; long r_maxsize; |
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|
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struct msg_msg *r_msg; |
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}; /* one msg_sender for each sleeping sender */ struct msg_sender { |
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struct list_head list; struct task_struct *tsk; |
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size_t msgsz; |
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}; #define SEARCH_ANY 1 #define SEARCH_EQUAL 2 #define SEARCH_NOTEQUAL 3 #define SEARCH_LESSEQUAL 4 |
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#define SEARCH_NUMBER 5 |
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|
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#define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) |
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|
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static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id) { |
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struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id); |
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if (IS_ERR(ipcp)) return ERR_CAST(ipcp); return container_of(ipcp, struct msg_queue, q_perm); } static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns, int id) { struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id); if (IS_ERR(ipcp)) return ERR_CAST(ipcp); return container_of(ipcp, struct msg_queue, q_perm); } |
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static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) { ipc_rmid(&msg_ids(ns), &s->q_perm); } |
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static void msg_rcu_free(struct rcu_head *head) { |
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struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu); struct msg_queue *msq = container_of(p, struct msg_queue, q_perm); |
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|
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security_msg_queue_free(&msq->q_perm); |
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kfree(msq); |
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} |
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/** * newque - Create a new msg queue * @ns: namespace * @params: ptr to the structure that contains the key and msgflg * |
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* Called with msg_ids.rwsem held (writer) |
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*/ |
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static int newque(struct ipc_namespace *ns, struct ipc_params *params) |
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{ |
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struct msg_queue *msq; |
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int retval; |
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key_t key = params->key; int msgflg = params->flg; |
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|
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msq = kmalloc(sizeof(*msq), GFP_KERNEL_ACCOUNT); |
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if (unlikely(!msq)) |
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return -ENOMEM; |
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msq->q_perm.mode = msgflg & S_IRWXUGO; |
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msq->q_perm.key = key; msq->q_perm.security = NULL; |
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retval = security_msg_queue_alloc(&msq->q_perm); |
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if (retval) { |
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kfree(msq); |
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return retval; } |
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msq->q_stime = msq->q_rtime = 0; |
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msq->q_ctime = ktime_get_real_seconds(); |
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msq->q_cbytes = msq->q_qnum = 0; |
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msq->q_qbytes = ns->msg_ctlmnb; |
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msq->q_lspid = msq->q_lrpid = NULL; |
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INIT_LIST_HEAD(&msq->q_messages); INIT_LIST_HEAD(&msq->q_receivers); INIT_LIST_HEAD(&msq->q_senders); |
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|
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/* ipc_addid() locks msq upon success. */ |
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retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); if (retval < 0) { |
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ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
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return retval; |
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} |
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ipc_unlock_object(&msq->q_perm); |
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rcu_read_unlock(); |
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|
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return msq->q_perm.id; |
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} |
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static inline bool msg_fits_inqueue(struct msg_queue *msq, size_t msgsz) { return msgsz + msq->q_cbytes <= msq->q_qbytes && 1 + msq->q_qnum <= msq->q_qbytes; } static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss, size_t msgsz) |
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{ |
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mss->tsk = current; |
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mss->msgsz = msgsz; |
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/* * No memory barrier required: we did ipc_lock_object(), * and the waker obtains that lock before calling wake_q_add(). */ |
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__set_current_state(TASK_INTERRUPTIBLE); |
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list_add_tail(&mss->list, &msq->q_senders); |
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} |
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static inline void ss_del(struct msg_sender *mss) |
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{ |
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if (mss->list.next) |
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list_del(&mss->list); } |
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static void ss_wakeup(struct msg_queue *msq, |
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struct wake_q_head *wake_q, bool kill) |
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{ |
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struct msg_sender *mss, *t; |
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struct task_struct *stop_tsk = NULL; struct list_head *h = &msq->q_senders; |
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|
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list_for_each_entry_safe(mss, t, h, list) { |
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if (kill) mss->list.next = NULL; |
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/* * Stop at the first task we don't wakeup, * we've already iterated the original * sender queue. */ else if (stop_tsk == mss->tsk) break; /* * We are not in an EIDRM scenario here, therefore * verify that we really need to wakeup the task. * To maintain current semantics and wakeup order, * move the sender to the tail on behalf of the * blocked task. */ else if (!msg_fits_inqueue(msq, mss->msgsz)) { if (!stop_tsk) stop_tsk = mss->tsk; list_move_tail(&mss->list, &msq->q_senders); continue; } |
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wake_q_add(wake_q, mss->tsk); |
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} } |
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static void expunge_all(struct msg_queue *msq, int res, struct wake_q_head *wake_q) |
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{ |
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struct msg_receiver *msr, *t; |
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|
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list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
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struct task_struct *r_tsk; r_tsk = get_task_struct(msr->r_tsk); |
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/* see MSG_BARRIER for purpose/pairing */ smp_store_release(&msr->r_msg, ERR_PTR(res)); |
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wake_q_add_safe(wake_q, r_tsk); |
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} } |
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/* * freeque() wakes up waiters on the sender and receiver waiting queue, |
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* removes the message queue from message queue ID IDR, and cleans up all the * messages associated with this queue. |
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* |
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* msg_ids.rwsem (writer) and the spinlock for this message queue are held * before freeque() is called. msg_ids.rwsem remains locked on exit. |
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*/ |
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static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
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__releases(RCU) __releases(&msq->q_perm) |
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{ |
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struct msg_msg *msg, *t; |
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struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
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DEFINE_WAKE_Q(wake_q); |
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|
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expunge_all(msq, -EIDRM, &wake_q); |
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ss_wakeup(msq, &wake_q, true); |
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msg_rmid(ns, msq); |
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ipc_unlock_object(&msq->q_perm); |
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wake_up_q(&wake_q); |
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rcu_read_unlock(); |
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|
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list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { |
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atomic_dec(&ns->msg_hdrs); |
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free_msg(msg); } |
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atomic_sub(msq->q_cbytes, &ns->msg_bytes); |
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ipc_update_pid(&msq->q_lspid, NULL); ipc_update_pid(&msq->q_lrpid, NULL); |
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ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
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} |
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long ksys_msgget(key_t key, int msgflg) |
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{ |
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struct ipc_namespace *ns; |
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static const struct ipc_ops msg_ops = { .getnew = newque, |
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.associate = security_msg_queue_associate, |
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}; |
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struct ipc_params msg_params; |
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ns = current->nsproxy->ipc_ns; |
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|
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msg_params.key = key; msg_params.flg = msgflg; |
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|
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return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); |
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} |
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SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) { return ksys_msgget(key, msgflg); } |
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static inline unsigned long copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) |
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{ |
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switch (version) { |
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case IPC_64: |
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return copy_to_user(buf, in, sizeof(*in)); |
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case IPC_OLD: |
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{ |
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struct msqid_ds out; |
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memset(&out, 0, sizeof(out)); |
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ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm); out.msg_stime = in->msg_stime; out.msg_rtime = in->msg_rtime; out.msg_ctime = in->msg_ctime; |
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if (in->msg_cbytes > USHRT_MAX) out.msg_cbytes = USHRT_MAX; |
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else out.msg_cbytes = in->msg_cbytes; out.msg_lcbytes = in->msg_cbytes; |
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if (in->msg_qnum > USHRT_MAX) out.msg_qnum = USHRT_MAX; |
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else out.msg_qnum = in->msg_qnum; |
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if (in->msg_qbytes > USHRT_MAX) out.msg_qbytes = USHRT_MAX; |
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else out.msg_qbytes = in->msg_qbytes; out.msg_lqbytes = in->msg_qbytes; out.msg_lspid = in->msg_lspid; out.msg_lrpid = in->msg_lrpid; |
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return copy_to_user(buf, &out, sizeof(out)); } |
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default: return -EINVAL; } } |
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static inline unsigned long |
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copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) |
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{ |
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switch (version) { |
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case IPC_64: |
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if (copy_from_user(out, buf, sizeof(*out))) |
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return -EFAULT; |
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return 0; |
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case IPC_OLD: |
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{ |
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struct msqid_ds tbuf_old; |
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if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
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return -EFAULT; |
239521f31 ipc: whitespace c... |
353 354 355 |
out->msg_perm.uid = tbuf_old.msg_perm.uid; out->msg_perm.gid = tbuf_old.msg_perm.gid; out->msg_perm.mode = tbuf_old.msg_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
356 |
|
5a06a363e [PATCH] ipc/msg.c... |
357 |
if (tbuf_old.msg_qbytes == 0) |
016d7132f IPC: get rid of t... |
358 |
out->msg_qbytes = tbuf_old.msg_lqbytes; |
1da177e4c Linux-2.6.12-rc2 |
359 |
else |
016d7132f IPC: get rid of t... |
360 |
out->msg_qbytes = tbuf_old.msg_qbytes; |
1da177e4c Linux-2.6.12-rc2 |
361 362 |
return 0; |
5a06a363e [PATCH] ipc/msg.c... |
363 |
} |
1da177e4c Linux-2.6.12-rc2 |
364 365 366 367 |
default: return -EINVAL; } } |
a0d092fc2 IPC/message queue... |
368 |
/* |
d9a605e40 ipc: rename ids->... |
369 |
* This function handles some msgctl commands which require the rwsem |
a0d092fc2 IPC/message queue... |
370 |
* to be held in write mode. |
d9a605e40 ipc: rename ids->... |
371 |
* NOTE: no locks must be held, the rwsem is taken inside this function. |
a0d092fc2 IPC/message queue... |
372 373 |
*/ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, |
889b33172 ipc/msg.c: consol... |
374 |
struct ipc64_perm *perm, int msg_qbytes) |
1da177e4c Linux-2.6.12-rc2 |
375 |
{ |
1da177e4c Linux-2.6.12-rc2 |
376 |
struct kern_ipc_perm *ipcp; |
a0d092fc2 IPC/message queue... |
377 378 |
struct msg_queue *msq; int err; |
d9a605e40 ipc: rename ids->... |
379 |
down_write(&msg_ids(ns).rwsem); |
7b4cc5d84 ipc: move locking... |
380 |
rcu_read_lock(); |
4241c1a30 ipc: rename ipcct... |
381 |
ipcp = ipcctl_obtain_check(ns, &msg_ids(ns), msqid, cmd, |
889b33172 ipc/msg.c: consol... |
382 |
perm, msg_qbytes); |
7b4cc5d84 ipc: move locking... |
383 384 |
if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); |
7b4cc5d84 ipc: move locking... |
385 386 |
goto out_unlock1; } |
a0d092fc2 IPC/message queue... |
387 |
|
a5f75e7f2 IPC: consolidate ... |
388 |
msq = container_of(ipcp, struct msg_queue, q_perm); |
a0d092fc2 IPC/message queue... |
389 |
|
d8c6e8543 msg/security: Pas... |
390 |
err = security_msg_queue_msgctl(&msq->q_perm, cmd); |
a0d092fc2 IPC/message queue... |
391 |
if (err) |
15724ecb7 ipc,msg: shorten ... |
392 |
goto out_unlock1; |
a0d092fc2 IPC/message queue... |
393 394 395 |
switch (cmd) { case IPC_RMID: |
15724ecb7 ipc,msg: shorten ... |
396 |
ipc_lock_object(&msq->q_perm); |
7b4cc5d84 ipc: move locking... |
397 |
/* freeque unlocks the ipc object and rcu */ |
a0d092fc2 IPC/message queue... |
398 399 400 |
freeque(ns, ipcp); goto out_up; case IPC_SET: |
e3658538b ipc/msg: batch qu... |
401 |
{ |
194a6b5b9 sched/wake_q: Ren... |
402 |
DEFINE_WAKE_Q(wake_q); |
e3658538b ipc/msg: batch qu... |
403 |
|
889b33172 ipc/msg.c: consol... |
404 |
if (msg_qbytes > ns->msg_ctlmnb && |
a0d092fc2 IPC/message queue... |
405 406 |
!capable(CAP_SYS_RESOURCE)) { err = -EPERM; |
15724ecb7 ipc,msg: shorten ... |
407 |
goto out_unlock1; |
a0d092fc2 IPC/message queue... |
408 |
} |
15724ecb7 ipc,msg: shorten ... |
409 |
ipc_lock_object(&msq->q_perm); |
889b33172 ipc/msg.c: consol... |
410 |
err = ipc_update_perm(perm, ipcp); |
1efdb69b0 userns: Convert i... |
411 |
if (err) |
7b4cc5d84 ipc: move locking... |
412 |
goto out_unlock0; |
1efdb69b0 userns: Convert i... |
413 |
|
889b33172 ipc/msg.c: consol... |
414 |
msq->q_qbytes = msg_qbytes; |
a0d092fc2 IPC/message queue... |
415 |
|
50578ea97 ipc: msg: Make ms... |
416 |
msq->q_ctime = ktime_get_real_seconds(); |
e3658538b ipc/msg: batch qu... |
417 418 |
/* * Sleeping receivers might be excluded by |
a0d092fc2 IPC/message queue... |
419 420 |
* stricter permissions. */ |
ee51636ca ipc/msg: implemen... |
421 |
expunge_all(msq, -EAGAIN, &wake_q); |
e3658538b ipc/msg: batch qu... |
422 423 |
/* * Sleeping senders might be able to send |
a0d092fc2 IPC/message queue... |
424 425 |
* due to a larger queue size. */ |
ed27f9122 ipc/msg: avoid wa... |
426 |
ss_wakeup(msq, &wake_q, false); |
e3658538b ipc/msg: batch qu... |
427 428 429 430 431 |
ipc_unlock_object(&msq->q_perm); wake_up_q(&wake_q); goto out_unlock1; } |
a0d092fc2 IPC/message queue... |
432 433 |
default: err = -EINVAL; |
15724ecb7 ipc,msg: shorten ... |
434 |
goto out_unlock1; |
a0d092fc2 IPC/message queue... |
435 |
} |
7b4cc5d84 ipc: move locking... |
436 437 438 439 440 |
out_unlock0: ipc_unlock_object(&msq->q_perm); out_unlock1: rcu_read_unlock(); |
a0d092fc2 IPC/message queue... |
441 |
out_up: |
d9a605e40 ipc: rename ids->... |
442 |
up_write(&msg_ids(ns).rwsem); |
a0d092fc2 IPC/message queue... |
443 444 |
return err; } |
156d9ed12 msgctl(): split t... |
445 446 |
static int msgctl_info(struct ipc_namespace *ns, int msqid, int cmd, struct msginfo *msginfo) |
a0d092fc2 IPC/message queue... |
447 |
{ |
2cafed30f ipc,msg: introduc... |
448 |
int err; |
27c331a17 ipc/util.c: furth... |
449 |
int max_idx; |
1da177e4c Linux-2.6.12-rc2 |
450 |
|
156d9ed12 msgctl(): split t... |
451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 |
/* * We must not return kernel stack data. * due to padding, it's not enough * to set all member fields. */ err = security_msg_queue_msgctl(NULL, cmd); if (err) return err; memset(msginfo, 0, sizeof(*msginfo)); msginfo->msgmni = ns->msg_ctlmni; msginfo->msgmax = ns->msg_ctlmax; msginfo->msgmnb = ns->msg_ctlmnb; msginfo->msgssz = MSGSSZ; msginfo->msgseg = MSGSEG; down_read(&msg_ids(ns).rwsem); if (cmd == MSG_INFO) { msginfo->msgpool = msg_ids(ns).in_use; msginfo->msgmap = atomic_read(&ns->msg_hdrs); msginfo->msgtql = atomic_read(&ns->msg_bytes); } else { msginfo->msgmap = MSGMAP; msginfo->msgpool = MSGPOOL; msginfo->msgtql = MSGTQL; |
1da177e4c Linux-2.6.12-rc2 |
475 |
} |
27c331a17 ipc/util.c: furth... |
476 |
max_idx = ipc_get_maxidx(&msg_ids(ns)); |
156d9ed12 msgctl(): split t... |
477 |
up_read(&msg_ids(ns).rwsem); |
27c331a17 ipc/util.c: furth... |
478 |
return (max_idx < 0) ? 0 : max_idx; |
156d9ed12 msgctl(): split t... |
479 |
} |
2cafed30f ipc,msg: introduc... |
480 |
|
156d9ed12 msgctl(): split t... |
481 482 483 |
static int msgctl_stat(struct ipc_namespace *ns, int msqid, int cmd, struct msqid64_ds *p) { |
156d9ed12 msgctl(): split t... |
484 |
struct msg_queue *msq; |
87ad4b0d8 ipc: fix ipc data... |
485 |
int err; |
ac0ba20ea ipc,msg: make msg... |
486 |
|
156d9ed12 msgctl(): split t... |
487 |
memset(p, 0, sizeof(*p)); |
ac0ba20ea ipc,msg: make msg... |
488 |
|
156d9ed12 msgctl(): split t... |
489 |
rcu_read_lock(); |
23c8cec8c ipc/msg: introduc... |
490 |
if (cmd == MSG_STAT || cmd == MSG_STAT_ANY) { |
156d9ed12 msgctl(): split t... |
491 492 493 |
msq = msq_obtain_object(ns, msqid); if (IS_ERR(msq)) { err = PTR_ERR(msq); |
1da177e4c Linux-2.6.12-rc2 |
494 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
495 |
} |
23c8cec8c ipc/msg: introduc... |
496 |
} else { /* IPC_STAT */ |
156d9ed12 msgctl(): split t... |
497 498 499 |
msq = msq_obtain_object_check(ns, msqid); if (IS_ERR(msq)) { err = PTR_ERR(msq); |
1da177e4c Linux-2.6.12-rc2 |
500 |
goto out_unlock; |
156d9ed12 msgctl(): split t... |
501 |
} |
156d9ed12 msgctl(): split t... |
502 |
} |
1da177e4c Linux-2.6.12-rc2 |
503 |
|
23c8cec8c ipc/msg: introduc... |
504 505 506 507 508 509 510 511 |
/* see comment for SHM_STAT_ANY */ if (cmd == MSG_STAT_ANY) audit_ipc_obj(&msq->q_perm); else { err = -EACCES; if (ipcperms(ns, &msq->q_perm, S_IRUGO)) goto out_unlock; } |
ac0ba20ea ipc,msg: make msg... |
512 |
|
d8c6e8543 msg/security: Pas... |
513 |
err = security_msg_queue_msgctl(&msq->q_perm, cmd); |
156d9ed12 msgctl(): split t... |
514 515 |
if (err) goto out_unlock; |
87ad4b0d8 ipc: fix ipc data... |
516 517 518 519 520 521 522 |
ipc_lock_object(&msq->q_perm); if (!ipc_valid_object(&msq->q_perm)) { ipc_unlock_object(&msq->q_perm); err = -EIDRM; goto out_unlock; } |
156d9ed12 msgctl(): split t... |
523 524 525 526 |
kernel_to_ipc64_perm(&msq->q_perm, &p->msg_perm); p->msg_stime = msq->q_stime; p->msg_rtime = msq->q_rtime; p->msg_ctime = msq->q_ctime; |
c2ab975c3 y2038: ipc: Repor... |
527 528 529 530 531 |
#ifndef CONFIG_64BIT p->msg_stime_high = msq->q_stime >> 32; p->msg_rtime_high = msq->q_rtime >> 32; p->msg_ctime_high = msq->q_ctime >> 32; #endif |
156d9ed12 msgctl(): split t... |
532 533 534 |
p->msg_cbytes = msq->q_cbytes; p->msg_qnum = msq->q_qnum; p->msg_qbytes = msq->q_qbytes; |
39a4940ea ipc/msg: Fix msgc... |
535 536 |
p->msg_lspid = pid_vnr(msq->q_lspid); p->msg_lrpid = pid_vnr(msq->q_lrpid); |
2cafed30f ipc,msg: introduc... |
537 |
|
615c999cd ipc: compute kern... |
538 539 540 541 542 543 544 545 546 547 548 549 550 |
if (cmd == IPC_STAT) { /* * As defined in SUS: * Return 0 on success */ err = 0; } else { /* * MSG_STAT and MSG_STAT_ANY (both Linux specific) * Return the full id, including the sequence number */ err = msq->q_perm.id; } |
1da177e4c Linux-2.6.12-rc2 |
551 |
|
615c999cd ipc: compute kern... |
552 |
ipc_unlock_object(&msq->q_perm); |
1da177e4c Linux-2.6.12-rc2 |
553 |
out_unlock: |
ac0ba20ea ipc,msg: make msg... |
554 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
555 556 |
return err; } |
275f22148 ipc: rename old-s... |
557 |
static long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf, int version) |
2cafed30f ipc,msg: introduc... |
558 |
{ |
2cafed30f ipc,msg: introduc... |
559 |
struct ipc_namespace *ns; |
156d9ed12 msgctl(): split t... |
560 561 |
struct msqid64_ds msqid64; int err; |
2cafed30f ipc,msg: introduc... |
562 563 564 |
if (msqid < 0 || cmd < 0) return -EINVAL; |
2cafed30f ipc,msg: introduc... |
565 566 567 568 |
ns = current->nsproxy->ipc_ns; switch (cmd) { case IPC_INFO: |
156d9ed12 msgctl(): split t... |
569 570 571 572 573 574 575 576 577 |
case MSG_INFO: { struct msginfo msginfo; err = msgctl_info(ns, msqid, cmd, &msginfo); if (err < 0) return err; if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) err = -EFAULT; return err; } |
2cafed30f ipc,msg: introduc... |
578 |
case MSG_STAT: /* msqid is an index rather than a msg queue id */ |
23c8cec8c ipc/msg: introduc... |
579 |
case MSG_STAT_ANY: |
2cafed30f ipc,msg: introduc... |
580 |
case IPC_STAT: |
156d9ed12 msgctl(): split t... |
581 582 583 584 585 586 |
err = msgctl_stat(ns, msqid, cmd, &msqid64); if (err < 0) return err; if (copy_msqid_to_user(buf, &msqid64, version)) err = -EFAULT; return err; |
2cafed30f ipc,msg: introduc... |
587 |
case IPC_SET: |
156d9ed12 msgctl(): split t... |
588 589 |
if (copy_msqid_from_user(&msqid64, buf, version)) return -EFAULT; |
889b33172 ipc/msg.c: consol... |
590 591 |
return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm, msqid64.msg_qbytes); |
2cafed30f ipc,msg: introduc... |
592 |
case IPC_RMID: |
889b33172 ipc/msg.c: consol... |
593 |
return msgctl_down(ns, msqid, cmd, NULL, 0); |
2cafed30f ipc,msg: introduc... |
594 595 596 597 |
default: return -EINVAL; } } |
e340db564 ipc: add msgctl s... |
598 599 |
SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) { |
275f22148 ipc: rename old-s... |
600 |
return ksys_msgctl(msqid, cmd, buf, IPC_64); |
e340db564 ipc: add msgctl s... |
601 |
} |
275f22148 ipc: rename old-s... |
602 603 604 605 606 607 608 609 610 611 612 613 614 |
#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) { int version = ipc_parse_version(&cmd); return ksys_msgctl(msqid, cmd, buf, version); } SYSCALL_DEFINE3(old_msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) { return ksys_old_msgctl(msqid, cmd, buf); } #endif |
469391684 msgctl(): move co... |
615 616 617 618 619 620 |
#ifdef CONFIG_COMPAT struct compat_msqid_ds { struct compat_ipc_perm msg_perm; compat_uptr_t msg_first; compat_uptr_t msg_last; |
9afc5eee6 y2038: globally r... |
621 622 623 |
old_time32_t msg_stime; old_time32_t msg_rtime; old_time32_t msg_ctime; |
469391684 msgctl(): move co... |
624 625 626 627 628 629 630 631 632 633 634 635 636 637 |
compat_ulong_t msg_lcbytes; compat_ulong_t msg_lqbytes; unsigned short msg_cbytes; unsigned short msg_qnum; unsigned short msg_qbytes; compat_ipc_pid_t msg_lspid; compat_ipc_pid_t msg_lrpid; }; static int copy_compat_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) { memset(out, 0, sizeof(*out)); if (version == IPC_64) { |
6aa211e8c fix address space... |
638 |
struct compat_msqid64_ds __user *p = buf; |
28327fae6 ipc: make use of ... |
639 |
if (get_compat_ipc64_perm(&out->msg_perm, &p->msg_perm)) |
469391684 msgctl(): move co... |
640 |
return -EFAULT; |
469391684 msgctl(): move co... |
641 642 643 |
if (get_user(out->msg_qbytes, &p->msg_qbytes)) return -EFAULT; } else { |
6aa211e8c fix address space... |
644 |
struct compat_msqid_ds __user *p = buf; |
28327fae6 ipc: make use of ... |
645 |
if (get_compat_ipc_perm(&out->msg_perm, &p->msg_perm)) |
469391684 msgctl(): move co... |
646 |
return -EFAULT; |
469391684 msgctl(): move co... |
647 648 649 650 651 652 653 654 655 656 657 658 |
if (get_user(out->msg_qbytes, &p->msg_qbytes)) return -EFAULT; } return 0; } static int copy_compat_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) { if (version == IPC_64) { struct compat_msqid64_ds v; memset(&v, 0, sizeof(v)); |
28327fae6 ipc: make use of ... |
659 |
to_compat_ipc64_perm(&v.msg_perm, &in->msg_perm); |
c2ab975c3 y2038: ipc: Repor... |
660 661 662 663 664 665 |
v.msg_stime = lower_32_bits(in->msg_stime); v.msg_stime_high = upper_32_bits(in->msg_stime); v.msg_rtime = lower_32_bits(in->msg_rtime); v.msg_rtime_high = upper_32_bits(in->msg_rtime); v.msg_ctime = lower_32_bits(in->msg_ctime); v.msg_ctime_high = upper_32_bits(in->msg_ctime); |
469391684 msgctl(): move co... |
666 667 668 669 670 671 672 673 674 |
v.msg_cbytes = in->msg_cbytes; v.msg_qnum = in->msg_qnum; v.msg_qbytes = in->msg_qbytes; v.msg_lspid = in->msg_lspid; v.msg_lrpid = in->msg_lrpid; return copy_to_user(buf, &v, sizeof(v)); } else { struct compat_msqid_ds v; memset(&v, 0, sizeof(v)); |
28327fae6 ipc: make use of ... |
675 |
to_compat_ipc_perm(&v.msg_perm, &in->msg_perm); |
469391684 msgctl(): move co... |
676 677 678 679 680 681 682 683 684 685 686 |
v.msg_stime = in->msg_stime; v.msg_rtime = in->msg_rtime; v.msg_ctime = in->msg_ctime; v.msg_cbytes = in->msg_cbytes; v.msg_qnum = in->msg_qnum; v.msg_qbytes = in->msg_qbytes; v.msg_lspid = in->msg_lspid; v.msg_lrpid = in->msg_lrpid; return copy_to_user(buf, &v, sizeof(v)); } } |
275f22148 ipc: rename old-s... |
687 |
static long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr, int version) |
469391684 msgctl(): move co... |
688 689 690 691 |
{ struct ipc_namespace *ns; int err; struct msqid64_ds msqid64; |
469391684 msgctl(): move co... |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 |
ns = current->nsproxy->ipc_ns; if (msqid < 0 || cmd < 0) return -EINVAL; switch (cmd & (~IPC_64)) { case IPC_INFO: case MSG_INFO: { struct msginfo msginfo; err = msgctl_info(ns, msqid, cmd, &msginfo); if (err < 0) return err; if (copy_to_user(uptr, &msginfo, sizeof(struct msginfo))) err = -EFAULT; return err; } case IPC_STAT: case MSG_STAT: |
23c8cec8c ipc/msg: introduc... |
711 |
case MSG_STAT_ANY: |
469391684 msgctl(): move co... |
712 713 714 715 716 717 718 719 720 |
err = msgctl_stat(ns, msqid, cmd, &msqid64); if (err < 0) return err; if (copy_compat_msqid_to_user(uptr, &msqid64, version)) err = -EFAULT; return err; case IPC_SET: if (copy_compat_msqid_from_user(&msqid64, uptr, version)) return -EFAULT; |
889b33172 ipc/msg.c: consol... |
721 |
return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm, msqid64.msg_qbytes); |
469391684 msgctl(): move co... |
722 |
case IPC_RMID: |
889b33172 ipc/msg.c: consol... |
723 |
return msgctl_down(ns, msqid, cmd, NULL, 0); |
469391684 msgctl(): move co... |
724 725 726 727 |
default: return -EINVAL; } } |
e340db564 ipc: add msgctl s... |
728 729 730 |
COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr) { |
275f22148 ipc: rename old-s... |
731 |
return compat_ksys_msgctl(msqid, cmd, uptr, IPC_64); |
e340db564 ipc: add msgctl s... |
732 |
} |
275f22148 ipc: rename old-s... |
733 734 735 736 737 738 739 740 741 742 743 744 745 746 |
#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr) { int version = compat_ipc_parse_version(&cmd); return compat_ksys_msgctl(msqid, cmd, uptr, version); } COMPAT_SYSCALL_DEFINE3(old_msgctl, int, msqid, int, cmd, void __user *, uptr) { return compat_ksys_old_msgctl(msqid, cmd, uptr); } #endif |
469391684 msgctl(): move co... |
747 |
#endif |
5a06a363e [PATCH] ipc/msg.c... |
748 |
static int testmsg(struct msg_msg *msg, long type, int mode) |
1da177e4c Linux-2.6.12-rc2 |
749 |
{ |
46c0a8ca3 ipc, kernel: clea... |
750 751 752 753 754 755 756 757 758 759 |
switch (mode) { case SEARCH_ANY: case SEARCH_NUMBER: return 1; case SEARCH_LESSEQUAL: if (msg->m_type <= type) return 1; break; case SEARCH_EQUAL: if (msg->m_type == type) |
1da177e4c Linux-2.6.12-rc2 |
760 |
return 1; |
46c0a8ca3 ipc, kernel: clea... |
761 762 763 764 765 |
break; case SEARCH_NOTEQUAL: if (msg->m_type != type) return 1; break; |
1da177e4c Linux-2.6.12-rc2 |
766 767 768 |
} return 0; } |
ee51636ca ipc/msg: implemen... |
769 770 |
static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, struct wake_q_head *wake_q) |
1da177e4c Linux-2.6.12-rc2 |
771 |
{ |
41239fe82 ipc/msg.c: use li... |
772 |
struct msg_receiver *msr, *t; |
5a06a363e [PATCH] ipc/msg.c... |
773 |
|
41239fe82 ipc/msg.c: use li... |
774 |
list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
5a06a363e [PATCH] ipc/msg.c... |
775 |
if (testmsg(msg, msr->r_msgtype, msr->r_mode) && |
d8c6e8543 msg/security: Pas... |
776 |
!security_msg_queue_msgrcv(&msq->q_perm, msg, msr->r_tsk, |
5a06a363e [PATCH] ipc/msg.c... |
777 |
msr->r_msgtype, msr->r_mode)) { |
1da177e4c Linux-2.6.12-rc2 |
778 |
list_del(&msr->r_list); |
5a06a363e [PATCH] ipc/msg.c... |
779 |
if (msr->r_maxsize < msg->m_ts) { |
ee51636ca ipc/msg: implemen... |
780 |
wake_q_add(wake_q, msr->r_tsk); |
0d97a82ba ipc/msg.c: update... |
781 782 783 |
/* See expunge_all regarding memory barrier */ smp_store_release(&msr->r_msg, ERR_PTR(-E2BIG)); |
1da177e4c Linux-2.6.12-rc2 |
784 |
} else { |
39a4940ea ipc/msg: Fix msgc... |
785 |
ipc_update_pid(&msq->q_lrpid, task_pid(msr->r_tsk)); |
2a70b7879 y2038: ipc: Use k... |
786 |
msq->q_rtime = ktime_get_real_seconds(); |
5a06a363e [PATCH] ipc/msg.c... |
787 |
|
ee51636ca ipc/msg: implemen... |
788 |
wake_q_add(wake_q, msr->r_tsk); |
0d97a82ba ipc/msg.c: update... |
789 790 791 |
/* See expunge_all regarding memory barrier */ smp_store_release(&msr->r_msg, msg); |
1da177e4c Linux-2.6.12-rc2 |
792 793 794 795 |
return 1; } } } |
ffa571daf ipc,msg: document... |
796 |
|
1da177e4c Linux-2.6.12-rc2 |
797 798 |
return 0; } |
9b1404c24 msgrcv(2), msgsnd... |
799 |
static long do_msgsnd(int msqid, long mtype, void __user *mtext, |
651971cb7 [PATCH] Fix the s... |
800 |
size_t msgsz, int msgflg) |
1da177e4c Linux-2.6.12-rc2 |
801 802 803 |
{ struct msg_queue *msq; struct msg_msg *msg; |
1da177e4c Linux-2.6.12-rc2 |
804 |
int err; |
1e7869373 [PATCH] IPC names... |
805 |
struct ipc_namespace *ns; |
194a6b5b9 sched/wake_q: Ren... |
806 |
DEFINE_WAKE_Q(wake_q); |
1e7869373 [PATCH] IPC names... |
807 808 |
ns = current->nsproxy->ipc_ns; |
5a06a363e [PATCH] ipc/msg.c... |
809 |
|
1e7869373 [PATCH] IPC names... |
810 |
if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) |
1da177e4c Linux-2.6.12-rc2 |
811 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
812 813 |
if (mtype < 1) return -EINVAL; |
651971cb7 [PATCH] Fix the s... |
814 |
msg = load_msg(mtext, msgsz); |
5a06a363e [PATCH] ipc/msg.c... |
815 |
if (IS_ERR(msg)) |
1da177e4c Linux-2.6.12-rc2 |
816 817 818 819 |
return PTR_ERR(msg); msg->m_type = mtype; msg->m_ts = msgsz; |
3dd1f784e ipc,msg: shorten ... |
820 821 |
rcu_read_lock(); msq = msq_obtain_object_check(ns, msqid); |
023a53557 ipc: integrate ip... |
822 823 |
if (IS_ERR(msq)) { err = PTR_ERR(msq); |
3dd1f784e ipc,msg: shorten ... |
824 |
goto out_unlock1; |
023a53557 ipc: integrate ip... |
825 |
} |
1da177e4c Linux-2.6.12-rc2 |
826 |
|
bebcb928c ipc/msg.c: Fix lo... |
827 |
ipc_lock_object(&msq->q_perm); |
1da177e4c Linux-2.6.12-rc2 |
828 829 |
for (;;) { struct msg_sender s; |
5a06a363e [PATCH] ipc/msg.c... |
830 |
err = -EACCES; |
b0e77598f userns: user name... |
831 |
if (ipcperms(ns, &msq->q_perm, S_IWUGO)) |
bebcb928c ipc/msg.c: Fix lo... |
832 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
833 |
|
4271b05a2 ipc,msg: prevent ... |
834 |
/* raced with RMID? */ |
0f3d2b013 ipc: introduce ip... |
835 |
if (!ipc_valid_object(&msq->q_perm)) { |
4271b05a2 ipc,msg: prevent ... |
836 837 838 |
err = -EIDRM; goto out_unlock0; } |
d8c6e8543 msg/security: Pas... |
839 |
err = security_msg_queue_msgsnd(&msq->q_perm, msg, msgflg); |
1da177e4c Linux-2.6.12-rc2 |
840 |
if (err) |
bebcb928c ipc/msg.c: Fix lo... |
841 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
842 |
|
ed27f9122 ipc/msg: avoid wa... |
843 |
if (msg_fits_inqueue(msq, msgsz)) |
1da177e4c Linux-2.6.12-rc2 |
844 |
break; |
1da177e4c Linux-2.6.12-rc2 |
845 846 |
/* queue full, wait: */ |
5a06a363e [PATCH] ipc/msg.c... |
847 848 |
if (msgflg & IPC_NOWAIT) { err = -EAGAIN; |
bebcb928c ipc/msg.c: Fix lo... |
849 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
850 |
} |
3dd1f784e ipc,msg: shorten ... |
851 |
|
ffa571daf ipc,msg: document... |
852 |
/* enqueue the sender and prepare to block */ |
ed27f9122 ipc/msg: avoid wa... |
853 |
ss_add(msq, &s, msgsz); |
6062a8dc0 ipc,sem: fine gra... |
854 |
|
dba4cdd39 ipc: merge ipc_rc... |
855 |
if (!ipc_rcu_getref(&msq->q_perm)) { |
6062a8dc0 ipc,sem: fine gra... |
856 |
err = -EIDRM; |
3dd1f784e ipc,msg: shorten ... |
857 |
goto out_unlock0; |
6062a8dc0 ipc,sem: fine gra... |
858 |
} |
3dd1f784e ipc,msg: shorten ... |
859 860 |
ipc_unlock_object(&msq->q_perm); rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
861 |
schedule(); |
3dd1f784e ipc,msg: shorten ... |
862 863 |
rcu_read_lock(); ipc_lock_object(&msq->q_perm); |
dba4cdd39 ipc: merge ipc_rc... |
864 |
ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
0f3d2b013 ipc: introduce ip... |
865 866 |
/* raced with RMID? */ if (!ipc_valid_object(&msq->q_perm)) { |
1da177e4c Linux-2.6.12-rc2 |
867 |
err = -EIDRM; |
3dd1f784e ipc,msg: shorten ... |
868 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
869 870 |
} ss_del(&s); |
5a06a363e [PATCH] ipc/msg.c... |
871 |
|
1da177e4c Linux-2.6.12-rc2 |
872 |
if (signal_pending(current)) { |
5a06a363e [PATCH] ipc/msg.c... |
873 |
err = -ERESTARTNOHAND; |
3dd1f784e ipc,msg: shorten ... |
874 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
875 |
} |
3dd1f784e ipc,msg: shorten ... |
876 |
|
1da177e4c Linux-2.6.12-rc2 |
877 |
} |
ed27f9122 ipc/msg: avoid wa... |
878 |
|
39a4940ea ipc/msg: Fix msgc... |
879 |
ipc_update_pid(&msq->q_lspid, task_tgid(current)); |
2a70b7879 y2038: ipc: Use k... |
880 |
msq->q_stime = ktime_get_real_seconds(); |
1da177e4c Linux-2.6.12-rc2 |
881 |
|
ee51636ca ipc/msg: implemen... |
882 |
if (!pipelined_send(msq, msg, &wake_q)) { |
25985edce Fix common misspe... |
883 |
/* no one is waiting for this message, enqueue it */ |
5a06a363e [PATCH] ipc/msg.c... |
884 |
list_add_tail(&msg->m_list, &msq->q_messages); |
1da177e4c Linux-2.6.12-rc2 |
885 886 |
msq->q_cbytes += msgsz; msq->q_qnum++; |
3ac88a41f virtualization of... |
887 888 |
atomic_add(msgsz, &ns->msg_bytes); atomic_inc(&ns->msg_hdrs); |
1da177e4c Linux-2.6.12-rc2 |
889 |
} |
5a06a363e [PATCH] ipc/msg.c... |
890 |
|
1da177e4c Linux-2.6.12-rc2 |
891 892 |
err = 0; msg = NULL; |
3dd1f784e ipc,msg: shorten ... |
893 894 |
out_unlock0: ipc_unlock_object(&msq->q_perm); |
ee51636ca ipc/msg: implemen... |
895 |
wake_up_q(&wake_q); |
3dd1f784e ipc,msg: shorten ... |
896 897 |
out_unlock1: rcu_read_unlock(); |
5a06a363e [PATCH] ipc/msg.c... |
898 |
if (msg != NULL) |
1da177e4c Linux-2.6.12-rc2 |
899 900 901 |
free_msg(msg); return err; } |
31c213f21 ipc: add msgsnd s... |
902 903 |
long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) |
651971cb7 [PATCH] Fix the s... |
904 905 906 907 908 909 910 |
{ long mtype; if (get_user(mtype, &msgp->mtype)) return -EFAULT; return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); } |
31c213f21 ipc: add msgsnd s... |
911 912 913 914 915 |
SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, int, msgflg) { return ksys_msgsnd(msqid, msgp, msgsz, msgflg); } |
9b1404c24 msgrcv(2), msgsnd... |
916 917 918 919 920 921 |
#ifdef CONFIG_COMPAT struct compat_msgbuf { compat_long_t mtype; char mtext[1]; }; |
31c213f21 ipc: add msgsnd s... |
922 923 |
long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz, int msgflg) |
9b1404c24 msgrcv(2), msgsnd... |
924 925 926 927 928 929 930 931 |
{ struct compat_msgbuf __user *up = compat_ptr(msgp); compat_long_t mtype; if (get_user(mtype, &up->mtype)) return -EFAULT; return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); } |
31c213f21 ipc: add msgsnd s... |
932 933 934 935 936 937 |
COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, int, msgflg) { return compat_ksys_msgsnd(msqid, msgp, msgsz, msgflg); } |
9b1404c24 msgrcv(2), msgsnd... |
938 |
#endif |
5a06a363e [PATCH] ipc/msg.c... |
939 |
static inline int convert_mode(long *msgtyp, int msgflg) |
1da177e4c Linux-2.6.12-rc2 |
940 |
{ |
8ac6ed585 ipc: implement MS... |
941 942 |
if (msgflg & MSG_COPY) return SEARCH_NUMBER; |
5a06a363e [PATCH] ipc/msg.c... |
943 |
/* |
1da177e4c Linux-2.6.12-rc2 |
944 945 946 |
* find message of correct type. * msgtyp = 0 => get first. * msgtyp > 0 => get first message of matching type. |
5a06a363e [PATCH] ipc/msg.c... |
947 |
* msgtyp < 0 => get message with least type must be < abs(msgtype). |
1da177e4c Linux-2.6.12-rc2 |
948 |
*/ |
5a06a363e [PATCH] ipc/msg.c... |
949 |
if (*msgtyp == 0) |
1da177e4c Linux-2.6.12-rc2 |
950 |
return SEARCH_ANY; |
5a06a363e [PATCH] ipc/msg.c... |
951 |
if (*msgtyp < 0) { |
999898355 ipc: msg, make ms... |
952 953 954 955 |
if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */ *msgtyp = LONG_MAX; else *msgtyp = -*msgtyp; |
1da177e4c Linux-2.6.12-rc2 |
956 957 |
return SEARCH_LESSEQUAL; } |
5a06a363e [PATCH] ipc/msg.c... |
958 |
if (msgflg & MSG_EXCEPT) |
1da177e4c Linux-2.6.12-rc2 |
959 960 961 |
return SEARCH_NOTEQUAL; return SEARCH_EQUAL; } |
f9dd87f47 ipc: message queu... |
962 963 964 965 966 967 968 969 970 971 972 973 974 |
static long do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) { struct msgbuf __user *msgp = dest; size_t msgsz; if (put_user(msg->m_type, &msgp->mtype)) return -EFAULT; msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; if (store_msg(msgp->mtext, msg, msgsz)) return -EFAULT; return msgsz; } |
4a674f34b ipc: introduce me... |
975 |
#ifdef CONFIG_CHECKPOINT_RESTORE |
3fcfe7865 ipc: add more com... |
976 977 978 979 |
/* * This function creates new kernel message structure, large enough to store * bufsz message bytes. */ |
8ac6ed585 ipc: implement MS... |
980 |
static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
4a674f34b ipc: introduce me... |
981 982 |
{ struct msg_msg *copy; |
4a674f34b ipc: introduce me... |
983 984 985 986 987 988 989 990 |
/* * Create dummy message to copy real message to. */ copy = load_msg(buf, bufsz); if (!IS_ERR(copy)) copy->m_ts = bufsz; return copy; } |
85398aa8d ipc: simplify fre... |
991 |
static inline void free_copy(struct msg_msg *copy) |
4a674f34b ipc: introduce me... |
992 |
{ |
85398aa8d ipc: simplify fre... |
993 |
if (copy) |
4a674f34b ipc: introduce me... |
994 995 996 |
free_msg(copy); } #else |
8ac6ed585 ipc: implement MS... |
997 |
static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
b30efe277 ipc: convert prep... |
998 999 1000 |
{ return ERR_PTR(-ENOSYS); } |
85398aa8d ipc: simplify fre... |
1001 1002 1003 |
static inline void free_copy(struct msg_msg *copy) { } |
4a674f34b ipc: introduce me... |
1004 |
#endif |
daaf74cf0 ipc: refactor msg... |
1005 1006 |
static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) { |
368ae537e IPC: bugfix for m... |
1007 |
struct msg_msg *msg, *found = NULL; |
daaf74cf0 ipc: refactor msg... |
1008 1009 1010 1011 |
long count = 0; list_for_each_entry(msg, &msq->q_messages, m_list) { if (testmsg(msg, *msgtyp, mode) && |
d8c6e8543 msg/security: Pas... |
1012 |
!security_msg_queue_msgrcv(&msq->q_perm, msg, current, |
daaf74cf0 ipc: refactor msg... |
1013 1014 1015 |
*msgtyp, mode)) { if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { *msgtyp = msg->m_type - 1; |
368ae537e IPC: bugfix for m... |
1016 |
found = msg; |
daaf74cf0 ipc: refactor msg... |
1017 1018 1019 1020 1021 1022 1023 1024 |
} else if (mode == SEARCH_NUMBER) { if (*msgtyp == count) return msg; } else return msg; count++; } } |
368ae537e IPC: bugfix for m... |
1025 |
return found ?: ERR_PTR(-EAGAIN); |
daaf74cf0 ipc: refactor msg... |
1026 |
} |
9b1404c24 msgrcv(2), msgsnd... |
1027 |
static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, |
f9dd87f47 ipc: message queu... |
1028 |
long (*msg_handler)(void __user *, struct msg_msg *, size_t)) |
1da177e4c Linux-2.6.12-rc2 |
1029 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1030 |
int mode; |
41a0d523d ipc,msg: shorten ... |
1031 |
struct msg_queue *msq; |
1e7869373 [PATCH] IPC names... |
1032 |
struct ipc_namespace *ns; |
41a0d523d ipc,msg: shorten ... |
1033 |
struct msg_msg *msg, *copy = NULL; |
194a6b5b9 sched/wake_q: Ren... |
1034 |
DEFINE_WAKE_Q(wake_q); |
1da177e4c Linux-2.6.12-rc2 |
1035 |
|
88b9e456b ipc: don't alloca... |
1036 |
ns = current->nsproxy->ipc_ns; |
f9dd87f47 ipc: message queu... |
1037 |
if (msqid < 0 || (long) bufsz < 0) |
1da177e4c Linux-2.6.12-rc2 |
1038 |
return -EINVAL; |
41a0d523d ipc,msg: shorten ... |
1039 |
|
4a674f34b ipc: introduce me... |
1040 |
if (msgflg & MSG_COPY) { |
4f87dac38 ipc: Fix 2 bugs i... |
1041 1042 |
if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT)) return -EINVAL; |
8ac6ed585 ipc: implement MS... |
1043 |
copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax)); |
4a674f34b ipc: introduce me... |
1044 1045 1046 |
if (IS_ERR(copy)) return PTR_ERR(copy); } |
5a06a363e [PATCH] ipc/msg.c... |
1047 |
mode = convert_mode(&msgtyp, msgflg); |
1da177e4c Linux-2.6.12-rc2 |
1048 |
|
41a0d523d ipc,msg: shorten ... |
1049 1050 |
rcu_read_lock(); msq = msq_obtain_object_check(ns, msqid); |
4a674f34b ipc: introduce me... |
1051 |
if (IS_ERR(msq)) { |
41a0d523d ipc,msg: shorten ... |
1052 |
rcu_read_unlock(); |
85398aa8d ipc: simplify fre... |
1053 |
free_copy(copy); |
023a53557 ipc: integrate ip... |
1054 |
return PTR_ERR(msq); |
4a674f34b ipc: introduce me... |
1055 |
} |
1da177e4c Linux-2.6.12-rc2 |
1056 1057 1058 |
for (;;) { struct msg_receiver msr_d; |
1da177e4c Linux-2.6.12-rc2 |
1059 1060 |
msg = ERR_PTR(-EACCES); |
b0e77598f userns: user name... |
1061 |
if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
41a0d523d ipc,msg: shorten ... |
1062 |
goto out_unlock1; |
1da177e4c Linux-2.6.12-rc2 |
1063 |
|
41a0d523d ipc,msg: shorten ... |
1064 |
ipc_lock_object(&msq->q_perm); |
4271b05a2 ipc,msg: prevent ... |
1065 1066 |
/* raced with RMID? */ |
0f3d2b013 ipc: introduce ip... |
1067 |
if (!ipc_valid_object(&msq->q_perm)) { |
4271b05a2 ipc,msg: prevent ... |
1068 1069 1070 |
msg = ERR_PTR(-EIDRM); goto out_unlock0; } |
daaf74cf0 ipc: refactor msg... |
1071 |
msg = find_msg(msq, &msgtyp, mode); |
5a06a363e [PATCH] ipc/msg.c... |
1072 1073 1074 1075 1076 |
if (!IS_ERR(msg)) { /* * Found a suitable message. * Unlink it from the queue. */ |
f9dd87f47 ipc: message queu... |
1077 |
if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) { |
1da177e4c Linux-2.6.12-rc2 |
1078 |
msg = ERR_PTR(-E2BIG); |
41a0d523d ipc,msg: shorten ... |
1079 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
1080 |
} |
3fcfe7865 ipc: add more com... |
1081 1082 1083 1084 |
/* * If we are copying, then do not unlink message and do * not update queue parameters. */ |
852028af8 ipc: remove msg h... |
1085 1086 |
if (msgflg & MSG_COPY) { msg = copy_msg(msg, copy); |
41a0d523d ipc,msg: shorten ... |
1087 |
goto out_unlock0; |
852028af8 ipc: remove msg h... |
1088 |
} |
41a0d523d ipc,msg: shorten ... |
1089 |
|
1da177e4c Linux-2.6.12-rc2 |
1090 1091 |
list_del(&msg->m_list); msq->q_qnum--; |
2a70b7879 y2038: ipc: Use k... |
1092 |
msq->q_rtime = ktime_get_real_seconds(); |
39a4940ea ipc/msg: Fix msgc... |
1093 |
ipc_update_pid(&msq->q_lrpid, task_tgid(current)); |
1da177e4c Linux-2.6.12-rc2 |
1094 |
msq->q_cbytes -= msg->m_ts; |
3ac88a41f virtualization of... |
1095 1096 |
atomic_sub(msg->m_ts, &ns->msg_bytes); atomic_dec(&ns->msg_hdrs); |
ed27f9122 ipc/msg: avoid wa... |
1097 |
ss_wakeup(msq, &wake_q, false); |
41a0d523d ipc,msg: shorten ... |
1098 1099 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
1100 |
} |
41a0d523d ipc,msg: shorten ... |
1101 |
|
1da177e4c Linux-2.6.12-rc2 |
1102 1103 1104 |
/* No message waiting. Wait for a message */ if (msgflg & IPC_NOWAIT) { msg = ERR_PTR(-ENOMSG); |
41a0d523d ipc,msg: shorten ... |
1105 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
1106 |
} |
41a0d523d ipc,msg: shorten ... |
1107 |
|
5a06a363e [PATCH] ipc/msg.c... |
1108 |
list_add_tail(&msr_d.r_list, &msq->q_receivers); |
1da177e4c Linux-2.6.12-rc2 |
1109 1110 1111 |
msr_d.r_tsk = current; msr_d.r_msgtype = msgtyp; msr_d.r_mode = mode; |
5a06a363e [PATCH] ipc/msg.c... |
1112 |
if (msgflg & MSG_NOERROR) |
1da177e4c Linux-2.6.12-rc2 |
1113 |
msr_d.r_maxsize = INT_MAX; |
5a06a363e [PATCH] ipc/msg.c... |
1114 |
else |
f9dd87f47 ipc: message queu... |
1115 |
msr_d.r_maxsize = bufsz; |
0d97a82ba ipc/msg.c: update... |
1116 1117 1118 1119 1120 |
/* memory barrier not require due to ipc_lock_object() */ WRITE_ONCE(msr_d.r_msg, ERR_PTR(-EAGAIN)); /* memory barrier not required, we own ipc_lock_object() */ |
f75a2f358 ipc,msg: use curr... |
1121 |
__set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1122 |
|
41a0d523d ipc,msg: shorten ... |
1123 1124 |
ipc_unlock_object(&msq->q_perm); rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1125 |
schedule(); |
ee51636ca ipc/msg: implemen... |
1126 1127 1128 1129 1130 1131 |
/* * Lockless receive, part 1: * We don't hold a reference to the queue and getting a * reference would defeat the idea of a lockless operation, * thus the code relies on rcu to guarantee the existence of * msq: |
1da177e4c Linux-2.6.12-rc2 |
1132 1133 |
* Prior to destruction, expunge_all(-EIRDM) changes r_msg. * Thus if r_msg is -EAGAIN, then the queue not yet destroyed. |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 |
*/ rcu_read_lock(); |
ee51636ca ipc/msg: implemen... |
1136 1137 1138 1139 1140 1141 |
/* * Lockless receive, part 2: * The work in pipelined_send() and expunge_all(): * - Set pointer to message * - Queue the receiver task for later wakeup * - Wake up the process after the lock is dropped. |
ff35e5ef8 ipc,msg: provide ... |
1142 |
* |
ee51636ca ipc/msg: implemen... |
1143 1144 |
* Should the process wake up before this wakeup (due to a * signal) it will either see the message and continue ... |
1da177e4c Linux-2.6.12-rc2 |
1145 |
*/ |
ee51636ca ipc/msg: implemen... |
1146 |
msg = READ_ONCE(msr_d.r_msg); |
0d97a82ba ipc/msg.c: update... |
1147 1148 1149 |
if (msg != ERR_PTR(-EAGAIN)) { /* see MSG_BARRIER for purpose/pairing */ smp_acquire__after_ctrl_dep(); |
41a0d523d ipc,msg: shorten ... |
1150 |
goto out_unlock1; |
0d97a82ba ipc/msg.c: update... |
1151 |
} |
1da177e4c Linux-2.6.12-rc2 |
1152 |
|
ee51636ca ipc/msg: implemen... |
1153 1154 1155 1156 |
/* * ... or see -EAGAIN, acquire the lock to check the message * again. */ |
41a0d523d ipc,msg: shorten ... |
1157 |
ipc_lock_object(&msq->q_perm); |
1da177e4c Linux-2.6.12-rc2 |
1158 |
|
0d97a82ba ipc/msg.c: update... |
1159 |
msg = READ_ONCE(msr_d.r_msg); |
5a06a363e [PATCH] ipc/msg.c... |
1160 |
if (msg != ERR_PTR(-EAGAIN)) |
41a0d523d ipc,msg: shorten ... |
1161 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
1162 1163 1164 1165 |
list_del(&msr_d.r_list); if (signal_pending(current)) { msg = ERR_PTR(-ERESTARTNOHAND); |
41a0d523d ipc,msg: shorten ... |
1166 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
1167 |
} |
41a0d523d ipc,msg: shorten ... |
1168 1169 |
ipc_unlock_object(&msq->q_perm); |
1da177e4c Linux-2.6.12-rc2 |
1170 |
} |
41a0d523d ipc,msg: shorten ... |
1171 1172 1173 |
out_unlock0: ipc_unlock_object(&msq->q_perm); |
e3658538b ipc/msg: batch qu... |
1174 |
wake_up_q(&wake_q); |
41a0d523d ipc,msg: shorten ... |
1175 1176 |
out_unlock1: rcu_read_unlock(); |
4a674f34b ipc: introduce me... |
1177 |
if (IS_ERR(msg)) { |
85398aa8d ipc: simplify fre... |
1178 |
free_copy(copy); |
5a06a363e [PATCH] ipc/msg.c... |
1179 |
return PTR_ERR(msg); |
4a674f34b ipc: introduce me... |
1180 |
} |
1da177e4c Linux-2.6.12-rc2 |
1181 |
|
f9dd87f47 ipc: message queu... |
1182 |
bufsz = msg_handler(buf, msg, bufsz); |
1da177e4c Linux-2.6.12-rc2 |
1183 |
free_msg(msg); |
5a06a363e [PATCH] ipc/msg.c... |
1184 |
|
f9dd87f47 ipc: message queu... |
1185 |
return bufsz; |
1da177e4c Linux-2.6.12-rc2 |
1186 |
} |
078faac9e ipc: add msgrcv s... |
1187 1188 1189 1190 1191 |
long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, long msgtyp, int msgflg) { return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill); } |
e48fbb699 [CVE-2009-0029] S... |
1192 1193 |
SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, long, msgtyp, int, msgflg) |
651971cb7 [PATCH] Fix the s... |
1194 |
{ |
078faac9e ipc: add msgrcv s... |
1195 |
return ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg); |
651971cb7 [PATCH] Fix the s... |
1196 |
} |
9b1404c24 msgrcv(2), msgsnd... |
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 |
#ifdef CONFIG_COMPAT static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) { struct compat_msgbuf __user *msgp = dest; size_t msgsz; if (put_user(msg->m_type, &msgp->mtype)) return -EFAULT; msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; if (store_msg(msgp->mtext, msg, msgsz)) return -EFAULT; return msgsz; } |
078faac9e ipc: add msgrcv s... |
1211 1212 |
long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg) |
9b1404c24 msgrcv(2), msgsnd... |
1213 1214 1215 1216 |
{ return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, msgflg, compat_do_msg_fill); } |
078faac9e ipc: add msgrcv s... |
1217 1218 1219 1220 1221 1222 1223 |
COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) { return compat_ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg); } |
9b1404c24 msgrcv(2), msgsnd... |
1224 |
#endif |
3440a6bd1 ipc,msg: move som... |
1225 |
|
eae04d25a ipc: simplify ipc... |
1226 |
void msg_init_ns(struct ipc_namespace *ns) |
3440a6bd1 ipc,msg: move som... |
1227 1228 1229 |
{ ns->msg_ctlmax = MSGMAX; ns->msg_ctlmnb = MSGMNB; |
0050ee059 ipc/msg: increase... |
1230 |
ns->msg_ctlmni = MSGMNI; |
3440a6bd1 ipc,msg: move som... |
1231 1232 1233 |
atomic_set(&ns->msg_bytes, 0); atomic_set(&ns->msg_hdrs, 0); |
eae04d25a ipc: simplify ipc... |
1234 |
ipc_init_ids(&ns->ids[IPC_MSG_IDS]); |
3440a6bd1 ipc,msg: move som... |
1235 1236 1237 1238 1239 1240 1241 |
} #ifdef CONFIG_IPC_NS void msg_exit_ns(struct ipc_namespace *ns) { free_ipcs(ns, &msg_ids(ns), freeque); idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr); |
0cfb6aee7 ipc: optimize sem... |
1242 |
rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht); |
3440a6bd1 ipc,msg: move som... |
1243 1244 |
} #endif |
1da177e4c Linux-2.6.12-rc2 |
1245 |
#ifdef CONFIG_PROC_FS |
19b4946ca [PATCH] ipc: conv... |
1246 |
static int sysvipc_msg_proc_show(struct seq_file *s, void *it) |
1da177e4c Linux-2.6.12-rc2 |
1247 |
{ |
39a4940ea ipc/msg: Fix msgc... |
1248 |
struct pid_namespace *pid_ns = ipc_seq_pid_ns(s); |
1efdb69b0 userns: Convert i... |
1249 |
struct user_namespace *user_ns = seq_user_ns(s); |
ade9f91b3 ipc: add missing ... |
1250 1251 |
struct kern_ipc_perm *ipcp = it; struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
19b4946ca [PATCH] ipc: conv... |
1252 |
|
7f032d6ef ipc: remove use o... |
1253 |
seq_printf(s, |
50578ea97 ipc: msg: Make ms... |
1254 1255 |
"%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10llu %10llu %10llu ", |
7f032d6ef ipc: remove use o... |
1256 1257 1258 1259 1260 |
msq->q_perm.key, msq->q_perm.id, msq->q_perm.mode, msq->q_cbytes, msq->q_qnum, |
39a4940ea ipc/msg: Fix msgc... |
1261 1262 |
pid_nr_ns(msq->q_lspid, pid_ns), pid_nr_ns(msq->q_lrpid, pid_ns), |
7f032d6ef ipc: remove use o... |
1263 1264 1265 1266 1267 1268 1269 1270 1271 |
from_kuid_munged(user_ns, msq->q_perm.uid), from_kgid_munged(user_ns, msq->q_perm.gid), from_kuid_munged(user_ns, msq->q_perm.cuid), from_kgid_munged(user_ns, msq->q_perm.cgid), msq->q_stime, msq->q_rtime, msq->q_ctime); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1272 1273 |
} #endif |
3440a6bd1 ipc,msg: move som... |
1274 |
|
eae04d25a ipc: simplify ipc... |
1275 |
void __init msg_init(void) |
3440a6bd1 ipc,msg: move som... |
1276 |
{ |
eae04d25a ipc: simplify ipc... |
1277 |
msg_init_ns(&init_ipc_ns); |
3440a6bd1 ipc,msg: move som... |
1278 |
|
3440a6bd1 ipc,msg: move som... |
1279 1280 1281 1282 1283 |
ipc_init_proc_interface("sysvipc/msg", " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime ", IPC_MSG_IDS, sysvipc_msg_proc_show); } |