X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=ipc%2Fmsg.c;h=9547cb7ac3135b9ba8964d13018f5ab6340552c9;hp=5b213d952545e82684dc1d3f212f311ad3348790;hb=4434ade8c9334a3ab975d8993de456f06841899e;hpb=1e78693738b71da037d0df340f38e919e8227c2b diff --git a/ipc/msg.c b/ipc/msg.c index 5b213d9..9547cb7 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -23,10 +23,10 @@ */ #include -#include #include #include #include +#include #include #include #include @@ -34,8 +34,9 @@ #include #include #include -#include +#include #include +#include #include #include @@ -52,7 +53,7 @@ struct msg_receiver { long r_msgtype; long r_maxsize; - volatile struct msg_msg *r_msg; + struct msg_msg *volatile r_msg; }; /* one msg_sender for each sleeping sender */ @@ -66,81 +67,122 @@ struct msg_sender { #define SEARCH_NOTEQUAL 3 #define SEARCH_LESSEQUAL 4 -static atomic_t msg_bytes = ATOMIC_INIT(0); -static atomic_t msg_hdrs = ATOMIC_INIT(0); +#define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) -static struct ipc_ids init_msg_ids; - -#define msg_ids(ns) (*((ns)->ids[IPC_MSG_IDS])) - -#define msg_lock(ns, id) ((struct msg_queue*)ipc_lock(&msg_ids(ns), id)) #define msg_unlock(msq) ipc_unlock(&(msq)->q_perm) -#define msg_rmid(ns, id) ((struct msg_queue*)ipc_rmid(&msg_ids(ns), id)) -#define msg_checkid(ns, msq, msgid) \ - ipc_checkid(&msg_ids(ns), &msq->q_perm, msgid) -#define msg_buildid(ns, id, seq) \ - ipc_buildid(&msg_ids(ns), id, seq) - -static void freeque (struct ipc_namespace *ns, struct msg_queue *msq, int id); -static int newque (struct ipc_namespace *ns, key_t key, int msgflg); + +static void freeque(struct ipc_namespace *, struct kern_ipc_perm *); +static int newque(struct ipc_namespace *, struct ipc_params *); #ifdef CONFIG_PROC_FS static int sysvipc_msg_proc_show(struct seq_file *s, void *it); #endif -static void __ipc_init __msg_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids) +/* + * Scale msgmni with the available lowmem size: the memory dedicated to msg + * queues should occupy at most 1/MSG_MEM_SCALE of lowmem. + * Also take into account the number of nsproxies created so far. + * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range. + */ +void recompute_msgmni(struct ipc_namespace *ns) { - ns->ids[IPC_MSG_IDS] = ids; - ns->msg_ctlmax = MSGMAX; - ns->msg_ctlmnb = MSGMNB; - ns->msg_ctlmni = MSGMNI; - ipc_init_ids(ids, ns->msg_ctlmni); + struct sysinfo i; + unsigned long allowed; + int nb_ns; + + si_meminfo(&i); + allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit) + / MSGMNB; + nb_ns = atomic_read(&nr_ipc_ns); + allowed /= nb_ns; + + if (allowed < MSGMNI) { + ns->msg_ctlmni = MSGMNI; + return; + } + + if (allowed > IPCMNI / nb_ns) { + ns->msg_ctlmni = IPCMNI / nb_ns; + return; + } + + ns->msg_ctlmni = allowed; } -#ifdef CONFIG_IPC_NS -int msg_init_ns(struct ipc_namespace *ns) +void msg_init_ns(struct ipc_namespace *ns) { - struct ipc_ids *ids; + ns->msg_ctlmax = MSGMAX; + ns->msg_ctlmnb = MSGMNB; - ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL); - if (ids == NULL) - return -ENOMEM; + recompute_msgmni(ns); - __msg_init_ns(ns, ids); - return 0; + atomic_set(&ns->msg_bytes, 0); + atomic_set(&ns->msg_hdrs, 0); + ipc_init_ids(&ns->ids[IPC_MSG_IDS]); } +#ifdef CONFIG_IPC_NS void msg_exit_ns(struct ipc_namespace *ns) { - int i; - struct msg_queue *msq; - - mutex_lock(&msg_ids(ns).mutex); - for (i = 0; i <= msg_ids(ns).max_id; i++) { - msq = msg_lock(ns, i); - if (msq == NULL) - continue; - - freeque(ns, msq, i); - } - mutex_unlock(&msg_ids(ns).mutex); - - kfree(ns->ids[IPC_MSG_IDS]); - ns->ids[IPC_MSG_IDS] = NULL; + free_ipcs(ns, &msg_ids(ns), freeque); + idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr); } #endif void __init msg_init(void) { - __msg_init_ns(&init_ipc_ns, &init_msg_ids); + msg_init_ns(&init_ipc_ns); + + printk(KERN_INFO "msgmni has been set to %d\n", + init_ipc_ns.msg_ctlmni); + ipc_init_proc_interface("sysvipc/msg", " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n", IPC_MSG_IDS, sysvipc_msg_proc_show); } -static int newque (struct ipc_namespace *ns, key_t key, int msgflg) +/* + * msg_lock_(check_) routines are called in the paths where the rw_mutex + * is not held. + */ +static inline struct msg_queue *msg_lock(struct ipc_namespace *ns, int id) +{ + struct kern_ipc_perm *ipcp = ipc_lock(&msg_ids(ns), id); + + if (IS_ERR(ipcp)) + return (struct msg_queue *)ipcp; + + return container_of(ipcp, struct msg_queue, q_perm); +} + +static inline struct msg_queue *msg_lock_check(struct ipc_namespace *ns, + int id) +{ + struct kern_ipc_perm *ipcp = ipc_lock_check(&msg_ids(ns), id); + + if (IS_ERR(ipcp)) + return (struct msg_queue *)ipcp; + + return container_of(ipcp, struct msg_queue, q_perm); +} + +static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) +{ + ipc_rmid(&msg_ids(ns), &s->q_perm); +} + +/** + * newque - Create a new msg queue + * @ns: namespace + * @params: ptr to the structure that contains the key and msgflg + * + * Called with msg_ids.rw_mutex held (writer) + */ +static int newque(struct ipc_namespace *ns, struct ipc_params *params) { struct msg_queue *msq; int id, retval; + key_t key = params->key; + int msgflg = params->flg; msq = ipc_rcu_alloc(sizeof(*msq)); if (!msq) @@ -156,14 +198,16 @@ static int newque (struct ipc_namespace *ns, key_t key, int msgflg) return retval; } + /* + * ipc_addid() locks msq + */ id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); - if (id == -1) { + if (id < 0) { security_msg_queue_free(msq); ipc_rcu_putref(msq); - return -ENOSPC; + return id; } - msq->q_id = msg_buildid(ns, id, msq->q_perm.seq); msq->q_stime = msq->q_rtime = 0; msq->q_ctime = get_seconds(); msq->q_cbytes = msq->q_qnum = 0; @@ -172,9 +216,10 @@ static int newque (struct ipc_namespace *ns, key_t key, int msgflg) INIT_LIST_HEAD(&msq->q_messages); INIT_LIST_HEAD(&msq->q_receivers); INIT_LIST_HEAD(&msq->q_senders); + msg_unlock(msq); - return msq->q_id; + return msq->q_perm.id; } static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss) @@ -225,19 +270,20 @@ static void expunge_all(struct msg_queue *msq, int res) /* * freeque() wakes up waiters on the sender and receiver waiting queue, - * removes the message queue from message queue ID - * array, and cleans up all the messages associated with this queue. + * removes the message queue from message queue ID IDR, and cleans up all the + * messages associated with this queue. * - * msg_ids.mutex and the spinlock for this message queue is hold - * before freeque() is called. msg_ids.mutex remains locked on exit. + * msg_ids.rw_mutex (writer) and the spinlock for this message queue are held + * before freeque() is called. msg_ids.rw_mutex remains locked on exit. */ -static void freeque(struct ipc_namespace *ns, struct msg_queue *msq, int id) +static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) { struct list_head *tmp; + struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); expunge_all(msq, -EIDRM); ss_wakeup(&msq->q_senders, 1); - msq = msg_rmid(ns, id); + msg_rmid(ns, msq); msg_unlock(msq); tmp = msq->q_messages.next; @@ -245,49 +291,40 @@ static void freeque(struct ipc_namespace *ns, struct msg_queue *msq, int id) struct msg_msg *msg = list_entry(tmp, struct msg_msg, m_list); tmp = tmp->next; - atomic_dec(&msg_hdrs); + atomic_dec(&ns->msg_hdrs); free_msg(msg); } - atomic_sub(msq->q_cbytes, &msg_bytes); + atomic_sub(msq->q_cbytes, &ns->msg_bytes); security_msg_queue_free(msq); ipc_rcu_putref(msq); } -asmlinkage long sys_msgget(key_t key, int msgflg) +/* + * Called with msg_ids.rw_mutex and ipcp locked. + */ +static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg) +{ + struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); + + return security_msg_queue_associate(msq, msgflg); +} + +SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) { - struct msg_queue *msq; - int id, ret = -EPERM; struct ipc_namespace *ns; + struct ipc_ops msg_ops; + struct ipc_params msg_params; ns = current->nsproxy->ipc_ns; - - mutex_lock(&msg_ids(ns).mutex); - if (key == IPC_PRIVATE) - ret = newque(ns, key, msgflg); - else if ((id = ipc_findkey(&msg_ids(ns), key)) == -1) { /* key not used */ - if (!(msgflg & IPC_CREAT)) - ret = -ENOENT; - else - ret = newque(ns, key, msgflg); - } else if (msgflg & IPC_CREAT && msgflg & IPC_EXCL) { - ret = -EEXIST; - } else { - msq = msg_lock(ns, id); - BUG_ON(msq == NULL); - if (ipcperms(&msq->q_perm, msgflg)) - ret = -EACCES; - else { - int qid = msg_buildid(ns, id, msq->q_perm.seq); - - ret = security_msg_queue_associate(msq, msgflg); - if (!ret) - ret = qid; - } - msg_unlock(msq); - } - mutex_unlock(&msg_ids(ns).mutex); - return ret; + msg_ops.getnew = newque; + msg_ops.associate = msg_security; + msg_ops.more_checks = NULL; + + msg_params.key = key; + msg_params.flg = msgflg; + + return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); } static inline unsigned long @@ -308,19 +345,19 @@ copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) out.msg_rtime = in->msg_rtime; out.msg_ctime = in->msg_ctime; - if (in->msg_cbytes > USHRT_MAX) - out.msg_cbytes = USHRT_MAX; + if (in->msg_cbytes > USHORT_MAX) + out.msg_cbytes = USHORT_MAX; else out.msg_cbytes = in->msg_cbytes; out.msg_lcbytes = in->msg_cbytes; - if (in->msg_qnum > USHRT_MAX) - out.msg_qnum = USHRT_MAX; + if (in->msg_qnum > USHORT_MAX) + out.msg_qnum = USHORT_MAX; else out.msg_qnum = in->msg_qnum; - if (in->msg_qbytes > USHRT_MAX) - out.msg_qbytes = USHRT_MAX; + if (in->msg_qbytes > USHORT_MAX) + out.msg_qbytes = USHORT_MAX; else out.msg_qbytes = in->msg_qbytes; out.msg_lqbytes = in->msg_qbytes; @@ -335,31 +372,14 @@ copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version) } } -struct msq_setbuf { - unsigned long qbytes; - uid_t uid; - gid_t gid; - mode_t mode; -}; - static inline unsigned long -copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version) +copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) { switch(version) { case IPC_64: - { - struct msqid64_ds tbuf; - - if (copy_from_user(&tbuf, buf, sizeof(tbuf))) + if (copy_from_user(out, buf, sizeof(*out))) return -EFAULT; - - out->qbytes = tbuf.msg_qbytes; - out->uid = tbuf.msg_perm.uid; - out->gid = tbuf.msg_perm.gid; - out->mode = tbuf.msg_perm.mode; - return 0; - } case IPC_OLD: { struct msqid_ds tbuf_old; @@ -367,14 +387,14 @@ copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version) if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) return -EFAULT; - out->uid = tbuf_old.msg_perm.uid; - out->gid = tbuf_old.msg_perm.gid; - out->mode = tbuf_old.msg_perm.mode; + 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; if (tbuf_old.msg_qbytes == 0) - out->qbytes = tbuf_old.msg_lqbytes; + out->msg_qbytes = tbuf_old.msg_lqbytes; else - out->qbytes = tbuf_old.msg_qbytes; + out->msg_qbytes = tbuf_old.msg_qbytes; return 0; } @@ -383,10 +403,71 @@ copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version) } } -asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) +/* + * This function handles some msgctl commands which require the rw_mutex + * to be held in write mode. + * NOTE: no locks must be held, the rw_mutex is taken inside this function. + */ +static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, + struct msqid_ds __user *buf, int version) { struct kern_ipc_perm *ipcp; - struct msq_setbuf setbuf; + struct msqid64_ds uninitialized_var(msqid64); + struct msg_queue *msq; + int err; + + if (cmd == IPC_SET) { + if (copy_msqid_from_user(&msqid64, buf, version)) + return -EFAULT; + } + + ipcp = ipcctl_pre_down(&msg_ids(ns), msqid, cmd, + &msqid64.msg_perm, msqid64.msg_qbytes); + if (IS_ERR(ipcp)) + return PTR_ERR(ipcp); + + msq = container_of(ipcp, struct msg_queue, q_perm); + + err = security_msg_queue_msgctl(msq, cmd); + if (err) + goto out_unlock; + + switch (cmd) { + case IPC_RMID: + freeque(ns, ipcp); + goto out_up; + case IPC_SET: + if (msqid64.msg_qbytes > ns->msg_ctlmnb && + !capable(CAP_SYS_RESOURCE)) { + err = -EPERM; + goto out_unlock; + } + + msq->q_qbytes = msqid64.msg_qbytes; + + ipc_update_perm(&msqid64.msg_perm, ipcp); + msq->q_ctime = get_seconds(); + /* sleeping receivers might be excluded by + * stricter permissions. + */ + expunge_all(msq, -EAGAIN); + /* sleeping senders might be able to send + * due to a larger queue size. + */ + ss_wakeup(&msq->q_senders, 0); + break; + default: + err = -EINVAL; + } +out_unlock: + msg_unlock(msq); +out_up: + up_write(&msg_ids(ns).rw_mutex); + return err; +} + +SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) +{ struct msg_queue *msq; int err, version; struct ipc_namespace *ns; @@ -421,23 +502,23 @@ asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) msginfo.msgmnb = ns->msg_ctlmnb; msginfo.msgssz = MSGSSZ; msginfo.msgseg = MSGSEG; - mutex_lock(&msg_ids(ns).mutex); + down_read(&msg_ids(ns).rw_mutex); if (cmd == MSG_INFO) { msginfo.msgpool = msg_ids(ns).in_use; - msginfo.msgmap = atomic_read(&msg_hdrs); - msginfo.msgtql = atomic_read(&msg_bytes); + msginfo.msgmap = atomic_read(&ns->msg_hdrs); + msginfo.msgtql = atomic_read(&ns->msg_bytes); } else { msginfo.msgmap = MSGMAP; msginfo.msgpool = MSGPOOL; msginfo.msgtql = MSGTQL; } - max_id = msg_ids(ns).max_id; - mutex_unlock(&msg_ids(ns).mutex); + max_id = ipc_get_maxid(&msg_ids(ns)); + up_read(&msg_ids(ns).rw_mutex); if (copy_to_user(buf, &msginfo, sizeof(struct msginfo))) return -EFAULT; return (max_id < 0) ? 0 : max_id; } - case MSG_STAT: + case MSG_STAT: /* msqid is an index rather than a msg queue id */ case IPC_STAT: { struct msqid64_ds tbuf; @@ -445,21 +526,16 @@ asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) if (!buf) return -EFAULT; - if (cmd == MSG_STAT && msqid >= msg_ids(ns).entries->size) - return -EINVAL; - - memset(&tbuf, 0, sizeof(tbuf)); - - msq = msg_lock(ns, msqid); - if (msq == NULL) - return -EINVAL; if (cmd == MSG_STAT) { - success_return = msg_buildid(ns, msqid, msq->q_perm.seq); + msq = msg_lock(ns, msqid); + if (IS_ERR(msq)) + return PTR_ERR(msq); + success_return = msq->q_perm.id; } else { - err = -EIDRM; - if (msg_checkid(ns, msq, msqid)) - goto out_unlock; + msq = msg_lock_check(ns, msqid); + if (IS_ERR(msq)) + return PTR_ERR(msq); success_return = 0; } err = -EACCES; @@ -470,6 +546,8 @@ asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) if (err) goto out_unlock; + memset(&tbuf, 0, sizeof(tbuf)); + kernel_to_ipc64_perm(&msq->q_perm, &tbuf.msg_perm); tbuf.msg_stime = msq->q_stime; tbuf.msg_rtime = msq->q_rtime; @@ -485,84 +563,13 @@ asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf) return success_return; } case IPC_SET: - if (!buf) - return -EFAULT; - if (copy_msqid_from_user(&setbuf, buf, version)) - return -EFAULT; - break; case IPC_RMID: - break; + err = msgctl_down(ns, msqid, cmd, buf, version); + return err; default: return -EINVAL; } - mutex_lock(&msg_ids(ns).mutex); - msq = msg_lock(ns, msqid); - err = -EINVAL; - if (msq == NULL) - goto out_up; - - err = -EIDRM; - if (msg_checkid(ns, msq, msqid)) - goto out_unlock_up; - ipcp = &msq->q_perm; - - err = audit_ipc_obj(ipcp); - if (err) - goto out_unlock_up; - if (cmd==IPC_SET) { - err = audit_ipc_set_perm(setbuf.qbytes, setbuf.uid, setbuf.gid, - setbuf.mode); - if (err) - goto out_unlock_up; - } - - err = -EPERM; - if (current->euid != ipcp->cuid && - current->euid != ipcp->uid && !capable(CAP_SYS_ADMIN)) - /* We _could_ check for CAP_CHOWN above, but we don't */ - goto out_unlock_up; - - err = security_msg_queue_msgctl(msq, cmd); - if (err) - goto out_unlock_up; - - switch (cmd) { - case IPC_SET: - { - err = -EPERM; - if (setbuf.qbytes > ns->msg_ctlmnb && !capable(CAP_SYS_RESOURCE)) - goto out_unlock_up; - - msq->q_qbytes = setbuf.qbytes; - - ipcp->uid = setbuf.uid; - ipcp->gid = setbuf.gid; - ipcp->mode = (ipcp->mode & ~S_IRWXUGO) | - (S_IRWXUGO & setbuf.mode); - msq->q_ctime = get_seconds(); - /* sleeping receivers might be excluded by - * stricter permissions. - */ - expunge_all(msq, -EAGAIN); - /* sleeping senders might be able to send - * due to a larger queue size. - */ - ss_wakeup(&msq->q_senders, 0); - msg_unlock(msq); - break; - } - case IPC_RMID: - freeque(ns, msq, msqid); - break; - } - err = 0; -out_up: - mutex_unlock(&msg_ids(ns).mutex); - return err; -out_unlock_up: - msg_unlock(msq); - goto out_up; out_unlock: msg_unlock(msq); return err; @@ -612,7 +619,7 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) msr->r_msg = ERR_PTR(-E2BIG); } else { msr->r_msg = NULL; - msq->q_lrpid = msr->r_tsk->pid; + msq->q_lrpid = task_pid_vnr(msr->r_tsk); msq->q_rtime = get_seconds(); wake_up_process(msr->r_tsk); smp_mb(); @@ -625,12 +632,11 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) return 0; } -asmlinkage long -sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) +long do_msgsnd(int msqid, long mtype, void __user *mtext, + size_t msgsz, int msgflg) { struct msg_queue *msq; struct msg_msg *msg; - long mtype; int err; struct ipc_namespace *ns; @@ -638,26 +644,21 @@ sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) return -EINVAL; - if (get_user(mtype, &msgp->mtype)) - return -EFAULT; if (mtype < 1) return -EINVAL; - msg = load_msg(msgp->mtext, msgsz); + msg = load_msg(mtext, msgsz); if (IS_ERR(msg)) return PTR_ERR(msg); msg->m_type = mtype; msg->m_ts = msgsz; - msq = msg_lock(ns, msqid); - err = -EINVAL; - if (msq == NULL) + msq = msg_lock_check(ns, msqid); + if (IS_ERR(msq)) { + err = PTR_ERR(msq); goto out_free; - - err= -EIDRM; - if (msg_checkid(ns, msq, msqid)) - goto out_unlock_free; + } for (;;) { struct msg_sender s; @@ -699,7 +700,7 @@ sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) } } - msq->q_lspid = current->tgid; + msq->q_lspid = task_tgid_vnr(current); msq->q_stime = get_seconds(); if (!pipelined_send(msq, msg)) { @@ -707,8 +708,8 @@ sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) list_add_tail(&msg->m_list, &msq->q_messages); msq->q_cbytes += msgsz; msq->q_qnum++; - atomic_add(msgsz, &msg_bytes); - atomic_inc(&msg_hdrs); + atomic_add(msgsz, &ns->msg_bytes); + atomic_inc(&ns->msg_hdrs); } err = 0; @@ -722,6 +723,16 @@ out_free: return err; } +SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, + int, msgflg) +{ + long mtype; + + if (get_user(mtype, &msgp->mtype)) + return -EFAULT; + return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); +} + static inline int convert_mode(long *msgtyp, int msgflg) { /* @@ -741,8 +752,8 @@ static inline int convert_mode(long *msgtyp, int msgflg) return SEARCH_EQUAL; } -asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, - long msgtyp, int msgflg) +long do_msgrcv(int msqid, long *pmtype, void __user *mtext, + size_t msgsz, long msgtyp, int msgflg) { struct msg_queue *msq; struct msg_msg *msg; @@ -754,13 +765,9 @@ asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, mode = convert_mode(&msgtyp, msgflg); ns = current->nsproxy->ipc_ns; - msq = msg_lock(ns, msqid); - if (msq == NULL) - return -EINVAL; - - msg = ERR_PTR(-EIDRM); - if (msg_checkid(ns, msq, msqid)) - goto out_unlock; + msq = msg_lock_check(ns, msqid); + if (IS_ERR(msq)) + return PTR_ERR(msq); for (;;) { struct msg_receiver msr_d; @@ -804,10 +811,10 @@ asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, list_del(&msg->m_list); msq->q_qnum--; msq->q_rtime = get_seconds(); - msq->q_lrpid = current->tgid; + msq->q_lrpid = task_tgid_vnr(current); msq->q_cbytes -= msg->m_ts; - atomic_sub(msg->m_ts, &msg_bytes); - atomic_dec(&msg_hdrs); + atomic_sub(msg->m_ts, &ns->msg_bytes); + atomic_dec(&ns->msg_hdrs); ss_wakeup(&msq->q_senders, 0); msg_unlock(msq); break; @@ -888,15 +895,30 @@ out_unlock: return PTR_ERR(msg); msgsz = (msgsz > msg->m_ts) ? msg->m_ts : msgsz; - if (put_user (msg->m_type, &msgp->mtype) || - store_msg(msgp->mtext, msg, msgsz)) { + *pmtype = msg->m_type; + if (store_msg(mtext, msg, msgsz)) msgsz = -EFAULT; - } + free_msg(msg); return msgsz; } +SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, + long, msgtyp, int, msgflg) +{ + long err, mtype; + + err = do_msgrcv(msqid, &mtype, msgp->mtext, msgsz, msgtyp, msgflg); + if (err < 0) + goto out; + + if (put_user(mtype, &msgp->mtype)) + err = -EFAULT; +out: + return err; +} + #ifdef CONFIG_PROC_FS static int sysvipc_msg_proc_show(struct seq_file *s, void *it) { @@ -905,7 +927,7 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it) return seq_printf(s, "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n", msq->q_perm.key, - msq->q_id, + msq->q_perm.id, msq->q_perm.mode, msq->q_cbytes, msq->q_qnum,