/*
* linux/ipc/msg.c
- * Copyright (C) 1992 Krishna Balasubramanian
+ * Copyright (C) 1992 Krishna Balasubramanian
*
* Removed all the remaining kerneld mess
* Catch the -EFAULT stuff properly
*
* mostly rewritten, threaded and wake-one semantics added
* MSGMAX limit removed, sysctl's added
- * (c) 1999 Manfred Spraul <manfreds@colorfullife.com>
+ * (c) 1999 Manfred Spraul <manfred@colorfullife.com>
+ *
+ * support for audit of ipc object properties and permission changes
+ * Dustin Kirkland <dustin.kirkland@us.ibm.com>
+ *
+ * namespaces support
+ * OpenVZ, SWsoft Inc.
+ * Pavel Emelianov <xemul@openvz.org>
*/
#include <linux/capability.h>
-#include <linux/config.h>
-#include <linux/slab.h>
#include <linux/msg.h>
#include <linux/spinlock.h>
#include <linux/init.h>
+#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/seq_file.h>
+#include <linux/rwsem.h>
+#include <linux/nsproxy.h>
+#include <linux/ipc_namespace.h>
+
#include <asm/current.h>
#include <asm/uaccess.h>
#include "util.h"
-/* sysctl: */
-int msg_ctlmax = MSGMAX;
-int msg_ctlmnb = MSGMNB;
-int msg_ctlmni = MSGMNI;
-
-/* one msg_receiver structure for each sleeping receiver */
+/*
+ * one msg_receiver structure for each sleeping receiver:
+ */
struct msg_receiver {
- struct list_head r_list;
- struct task_struct* r_tsk;
+ struct list_head r_list;
+ struct task_struct *r_tsk;
- int r_mode;
- long r_msgtype;
- long r_maxsize;
+ int r_mode;
+ long r_msgtype;
+ long r_maxsize;
- struct msg_msg* volatile r_msg;
+ struct msg_msg *volatile r_msg;
};
/* one msg_sender for each sleeping sender */
struct msg_sender {
- struct list_head list;
- struct task_struct* tsk;
+ struct list_head list;
+ struct task_struct *tsk;
};
#define SEARCH_ANY 1
#define SEARCH_NOTEQUAL 3
#define SEARCH_LESSEQUAL 4
-static atomic_t msg_bytes = ATOMIC_INIT(0);
-static atomic_t msg_hdrs = ATOMIC_INIT(0);
-
-static struct ipc_ids msg_ids;
+#define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS])
-#define msg_lock(id) ((struct msg_queue*)ipc_lock(&msg_ids,id))
-#define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
-#define msg_rmid(id) ((struct msg_queue*)ipc_rmid(&msg_ids,id))
-#define msg_checkid(msq, msgid) \
- ipc_checkid(&msg_ids,&msq->q_perm,msgid)
-#define msg_buildid(id, seq) \
- ipc_buildid(&msg_ids, id, seq)
+#define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
-static void freeque (struct msg_queue *msq, int id);
-static int newque (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
-void __init msg_init (void)
+/*
+ * 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)
+{
+ 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;
+}
+
+void msg_init_ns(struct ipc_namespace *ns)
+{
+ ns->msg_ctlmax = MSGMAX;
+ ns->msg_ctlmnb = MSGMNB;
+
+ recompute_msgmni(ns);
+
+ 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)
+{
+ free_ipcs(ns, &msg_ids(ns), freeque);
+ idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
+}
+#endif
+
+void __init msg_init(void)
{
- ipc_init_ids(&msg_ids,msg_ctlmni);
+ 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",
- &msg_ids,
- sysvipc_msg_proc_show);
+ IPC_MSG_IDS, sysvipc_msg_proc_show);
+}
+
+/*
+ * 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 int newque (key_t key, int msgflg)
+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)
{
- int id;
- int retval;
struct msg_queue *msq;
+ int id, retval;
+ key_t key = params->key;
+ int msgflg = params->flg;
- msq = ipc_rcu_alloc(sizeof(*msq));
- if (!msq)
+ msq = ipc_rcu_alloc(sizeof(*msq));
+ if (!msq)
return -ENOMEM;
- msq->q_perm.mode = (msgflg & S_IRWXUGO);
+ msq->q_perm.mode = msgflg & S_IRWXUGO;
msq->q_perm.key = key;
msq->q_perm.security = NULL;
return retval;
}
- id = ipc_addid(&msg_ids, &msq->q_perm, msg_ctlmni);
- if(id == -1) {
+ /*
+ * ipc_addid() locks msq
+ */
+ id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
+ if (id < 0) {
security_msg_queue_free(msq);
ipc_rcu_putref(msq);
- return -ENOSPC;
+ return id;
}
- msq->q_id = msg_buildid(id,msq->q_perm.seq);
msq->q_stime = msq->q_rtime = 0;
msq->q_ctime = get_seconds();
msq->q_cbytes = msq->q_qnum = 0;
- msq->q_qbytes = msg_ctlmnb;
+ msq->q_qbytes = ns->msg_ctlmnb;
msq->q_lspid = msq->q_lrpid = 0;
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)
+static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
{
- mss->tsk=current;
- current->state=TASK_INTERRUPTIBLE;
- list_add_tail(&mss->list,&msq->q_senders);
+ mss->tsk = current;
+ current->state = TASK_INTERRUPTIBLE;
+ list_add_tail(&mss->list, &msq->q_senders);
}
-static inline void ss_del(struct msg_sender* mss)
+static inline void ss_del(struct msg_sender *mss)
{
- if(mss->list.next != NULL)
+ if (mss->list.next != NULL)
list_del(&mss->list);
}
-static void ss_wakeup(struct list_head* h, int kill)
+static void ss_wakeup(struct list_head *h, int kill)
{
struct list_head *tmp;
tmp = h->next;
while (tmp != h) {
- struct msg_sender* mss;
-
- mss = list_entry(tmp,struct msg_sender,list);
+ struct msg_sender *mss;
+
+ mss = list_entry(tmp, struct msg_sender, list);
tmp = tmp->next;
- if(kill)
- mss->list.next=NULL;
+ if (kill)
+ mss->list.next = NULL;
wake_up_process(mss->tsk);
}
}
-static void expunge_all(struct msg_queue* msq, int res)
+static void expunge_all(struct msg_queue *msq, int res)
{
struct list_head *tmp;
tmp = msq->q_receivers.next;
while (tmp != &msq->q_receivers) {
- struct msg_receiver* msr;
-
- msr = list_entry(tmp,struct msg_receiver,r_list);
+ struct msg_receiver *msr;
+
+ msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
msr->r_msg = NULL;
wake_up_process(msr->r_tsk);
msr->r_msg = ERR_PTR(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.
+
+/*
+ * freeque() wakes up waiters on the sender and receiver waiting queue,
+ * removes the message queue from message queue ID IDR, and cleans up all the
+ * messages associated with this queue.
*
- * msg_ids.sem and the spinlock for this message queue is hold
- * before freeque() is called. msg_ids.sem 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 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(id);
+ expunge_all(msq, -EIDRM);
+ ss_wakeup(&msq->q_senders, 1);
+ msg_rmid(ns, msq);
msg_unlock(msq);
-
+
tmp = msq->q_messages.next;
- while(tmp != &msq->q_messages) {
- struct msg_msg* msg = list_entry(tmp,struct msg_msg,m_list);
+ while (tmp != &msq->q_messages) {
+ 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)
{
- int id, ret = -EPERM;
- struct msg_queue *msq;
-
- down(&msg_ids.sem);
- if (key == IPC_PRIVATE)
- ret = newque(key, msgflg);
- else if ((id = ipc_findkey(&msg_ids, key)) == -1) { /* key not used */
- if (!(msgflg & IPC_CREAT))
- ret = -ENOENT;
- else
- ret = newque(key, msgflg);
- } else if (msgflg & IPC_CREAT && msgflg & IPC_EXCL) {
- ret = -EEXIST;
- } else {
- msq = msg_lock(id);
- if(msq==NULL)
- BUG();
- if (ipcperms(&msq->q_perm, msgflg))
- ret = -EACCES;
- else {
- int qid = msg_buildid(id, msq->q_perm.seq);
- ret = security_msg_queue_associate(msq, msgflg);
- if (!ret)
- ret = qid;
- }
- msg_unlock(msq);
- }
- up(&msg_ids.sem);
- return ret;
+ struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
+
+ return security_msg_queue_associate(msq, msgflg);
}
-static inline unsigned long copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
+SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
+{
+ struct ipc_namespace *ns;
+ struct ipc_ops msg_ops;
+ struct ipc_params msg_params;
+
+ ns = current->nsproxy->ipc_ns;
+
+ 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
+copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
{
switch(version) {
case IPC_64:
- return copy_to_user (buf, in, sizeof(*in));
+ return copy_to_user(buf, in, sizeof(*in));
case IPC_OLD:
- {
+ {
struct msqid_ds out;
- memset(&out,0,sizeof(out));
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
out.msg_rtime = in->msg_rtime;
out.msg_ctime = in->msg_ctime;
- if(in->msg_cbytes > USHRT_MAX)
+ if (in->msg_cbytes > USHRT_MAX)
out.msg_cbytes = USHRT_MAX;
else
out.msg_cbytes = in->msg_cbytes;
out.msg_lcbytes = in->msg_cbytes;
- if(in->msg_qnum > USHRT_MAX)
+ if (in->msg_qnum > USHRT_MAX)
out.msg_qnum = USHRT_MAX;
else
out.msg_qnum = in->msg_qnum;
- if(in->msg_qbytes > USHRT_MAX)
+ if (in->msg_qbytes > USHRT_MAX)
out.msg_qbytes = USHRT_MAX;
else
out.msg_qbytes = in->msg_qbytes;
out.msg_lspid = in->msg_lspid;
out.msg_lrpid = in->msg_lrpid;
- return copy_to_user (buf, &out, sizeof(out));
- }
+ return copy_to_user(buf, &out, sizeof(out));
+ }
default:
return -EINVAL;
}
}
-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)
+static inline unsigned long
+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;
- if (copy_from_user (&tbuf_old, buf, sizeof (tbuf_old)))
+ 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;
+ if (tbuf_old.msg_qbytes == 0)
+ out->msg_qbytes = tbuf_old.msg_lqbytes;
else
- out->qbytes = tbuf_old.msg_qbytes;
+ out->msg_qbytes = tbuf_old.msg_qbytes;
return 0;
- }
+ }
default:
return -EINVAL;
}
}
-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)
{
- int err, version;
- struct msg_queue *msq;
- struct msq_setbuf setbuf;
struct kern_ipc_perm *ipcp;
-
+ 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(ns, &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;
+
if (msqid < 0 || cmd < 0)
return -EINVAL;
version = ipc_parse_version(&cmd);
+ ns = current->nsproxy->ipc_ns;
switch (cmd) {
- case IPC_INFO:
- case MSG_INFO:
- {
+ case IPC_INFO:
+ case MSG_INFO:
+ {
struct msginfo msginfo;
int max_id;
+
if (!buf)
return -EFAULT;
- /* We must not return kernel stack data.
+ /*
+ * 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 = msg_ctlmni;
- msginfo.msgmax = msg_ctlmax;
- msginfo.msgmnb = msg_ctlmnb;
+ 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(&msg_ids.sem);
+ down_read(&msg_ids(ns).rw_mutex);
if (cmd == MSG_INFO) {
- msginfo.msgpool = msg_ids.in_use;
- msginfo.msgmap = atomic_read(&msg_hdrs);
- msginfo.msgtql = atomic_read(&msg_bytes);
+ 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;
}
- max_id = msg_ids.max_id;
- up(&msg_ids.sem);
- if (copy_to_user (buf, &msginfo, sizeof(struct msginfo)))
+ 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;
+ 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;
int success_return;
+
if (!buf)
return -EFAULT;
- if(cmd == MSG_STAT && msqid >= msg_ids.entries->size)
- return -EINVAL;
-
- memset(&tbuf,0,sizeof(tbuf));
-
- msq = msg_lock(msqid);
- if (msq == NULL)
- return -EINVAL;
- if(cmd == MSG_STAT) {
- success_return = msg_buildid(msqid, msq->q_perm.seq);
+ if (cmd == MSG_STAT) {
+ 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(msq,msqid))
- goto out_unlock;
+ msq = msg_lock_check(ns, msqid);
+ if (IS_ERR(msq))
+ return PTR_ERR(msq);
success_return = 0;
}
err = -EACCES;
- if (ipcperms (&msq->q_perm, S_IRUGO))
+ if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
err = security_msg_queue_msgctl(msq, cmd);
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;
return success_return;
}
case IPC_SET:
- if (!buf)
- return -EFAULT;
- if (copy_msqid_from_user (&setbuf, buf, version))
- return -EFAULT;
- if ((err = audit_ipc_perms(setbuf.qbytes, setbuf.uid, setbuf.gid, setbuf.mode)))
- return err;
- break;
case IPC_RMID:
- break;
+ err = msgctl_down(ns, msqid, cmd, buf, version);
+ return err;
default:
return -EINVAL;
}
- down(&msg_ids.sem);
- msq = msg_lock(msqid);
- err=-EINVAL;
- if (msq == NULL)
- goto out_up;
-
- err = -EIDRM;
- if (msg_checkid(msq,msqid))
- goto out_unlock_up;
- ipcp = &msq->q_perm;
- 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 > 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 (msq, msqid);
- break;
- }
- err = 0;
-out_up:
- up(&msg_ids.sem);
- return err;
-out_unlock_up:
- msg_unlock(msq);
- goto out_up;
out_unlock:
msg_unlock(msq);
return err;
}
-static int testmsg(struct msg_msg* msg,long type,int mode)
+static int testmsg(struct msg_msg *msg, long type, int mode)
{
switch(mode)
{
case SEARCH_ANY:
return 1;
case SEARCH_LESSEQUAL:
- if(msg->m_type <=type)
+ if (msg->m_type <=type)
return 1;
break;
case SEARCH_EQUAL:
- if(msg->m_type == type)
+ if (msg->m_type == type)
return 1;
break;
case SEARCH_NOTEQUAL:
- if(msg->m_type != type)
+ if (msg->m_type != type)
return 1;
break;
}
return 0;
}
-static inline int pipelined_send(struct msg_queue* msq, struct msg_msg* msg)
+static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
{
- struct list_head* tmp;
+ struct list_head *tmp;
tmp = msq->q_receivers.next;
while (tmp != &msq->q_receivers) {
- struct msg_receiver* msr;
- msr = list_entry(tmp,struct msg_receiver,r_list);
+ struct msg_receiver *msr;
+
+ msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
- if(testmsg(msg,msr->r_msgtype,msr->r_mode) &&
- !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, msr->r_msgtype, msr->r_mode)) {
+ if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
+ !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
+ msr->r_msgtype, msr->r_mode)) {
+
list_del(&msr->r_list);
- if(msr->r_maxsize < msg->m_ts) {
+ if (msr->r_maxsize < msg->m_ts) {
msr->r_msg = NULL;
wake_up_process(msr->r_tsk);
smp_mb();
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();
msr->r_msg = msg;
+
return 1;
}
}
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;
-
- if (msgsz > msg_ctlmax || (long) msgsz < 0 || msqid < 0)
+ struct ipc_namespace *ns;
+
+ ns = current->nsproxy->ipc_ns;
+
+ 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);
- if(IS_ERR(msg))
+ msg = load_msg(mtext, msgsz);
+ if (IS_ERR(msg))
return PTR_ERR(msg);
msg->m_type = mtype;
msg->m_ts = msgsz;
- msq = msg_lock(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(msq,msqid))
- goto out_unlock_free;
+ }
for (;;) {
struct msg_sender s;
- err=-EACCES;
- if (ipcperms(&msq->q_perm, S_IWUGO))
+ err = -EACCES;
+ if (ipcperms(ns, &msq->q_perm, S_IWUGO))
goto out_unlock_free;
err = security_msg_queue_msgsnd(msq, msg, msgflg);
if (err)
goto out_unlock_free;
- if(msgsz + msq->q_cbytes <= msq->q_qbytes &&
+ if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
1 + msq->q_qnum <= msq->q_qbytes) {
break;
}
/* queue full, wait: */
- if(msgflg&IPC_NOWAIT) {
- err=-EAGAIN;
+ if (msgflg & IPC_NOWAIT) {
+ err = -EAGAIN;
goto out_unlock_free;
}
ss_add(msq, &s);
goto out_unlock_free;
}
ss_del(&s);
-
+
if (signal_pending(current)) {
- err=-ERESTARTNOHAND;
+ err = -ERESTARTNOHAND;
goto out_unlock_free;
}
}
- msq->q_lspid = current->tgid;
+ msq->q_lspid = task_tgid_vnr(current);
msq->q_stime = get_seconds();
- if(!pipelined_send(msq,msg)) {
- /* noone is waiting for this message, enqueue it */
- list_add_tail(&msg->m_list,&msq->q_messages);
+ if (!pipelined_send(msq, msg)) {
+ /* no one is waiting for this message, enqueue it */
+ 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;
msg = NULL;
out_unlock_free:
msg_unlock(msq);
out_free:
- if(msg!=NULL)
+ if (msg != NULL)
free_msg(msg);
return err;
}
-static inline int convert_mode(long* msgtyp, int msgflg)
+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)
+{
+ /*
* find message of correct type.
* msgtyp = 0 => get first.
* msgtyp > 0 => get first message of matching type.
- * msgtyp < 0 => get message with least type must be < abs(msgtype).
+ * msgtyp < 0 => get message with least type must be < abs(msgtype).
*/
- if(*msgtyp==0)
+ if (*msgtyp == 0)
return SEARCH_ANY;
- if(*msgtyp<0) {
- *msgtyp=-(*msgtyp);
+ if (*msgtyp < 0) {
+ *msgtyp = -*msgtyp;
return SEARCH_LESSEQUAL;
}
- if(msgflg & MSG_EXCEPT)
+ if (msgflg & MSG_EXCEPT)
return SEARCH_NOTEQUAL;
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;
int mode;
+ struct ipc_namespace *ns;
if (msqid < 0 || (long) msgsz < 0)
return -EINVAL;
- mode = convert_mode(&msgtyp,msgflg);
-
- msq = msg_lock(msqid);
- if(msq==NULL)
- return -EINVAL;
+ mode = convert_mode(&msgtyp, msgflg);
+ ns = current->nsproxy->ipc_ns;
- msg = ERR_PTR(-EIDRM);
- if (msg_checkid(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;
- struct list_head* tmp;
+ struct list_head *tmp;
msg = ERR_PTR(-EACCES);
- if (ipcperms (&msq->q_perm, S_IRUGO))
+ if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
while (tmp != &msq->q_messages) {
struct msg_msg *walk_msg;
- walk_msg = list_entry(tmp,struct msg_msg,m_list);
- if(testmsg(walk_msg,msgtyp,mode) &&
- !security_msg_queue_msgrcv(msq, walk_msg, current, msgtyp, mode)) {
+
+ walk_msg = list_entry(tmp, struct msg_msg, m_list);
+ if (testmsg(walk_msg, msgtyp, mode) &&
+ !security_msg_queue_msgrcv(msq, walk_msg, current,
+ msgtyp, mode)) {
+
msg = walk_msg;
- if(mode == SEARCH_LESSEQUAL && walk_msg->m_type != 1) {
- msg=walk_msg;
- msgtyp=walk_msg->m_type-1;
+ if (mode == SEARCH_LESSEQUAL &&
+ walk_msg->m_type != 1) {
+ msg = walk_msg;
+ msgtyp = walk_msg->m_type - 1;
} else {
- msg=walk_msg;
+ msg = walk_msg;
break;
}
}
tmp = tmp->next;
}
- if(!IS_ERR(msg)) {
- /* Found a suitable message. Unlink it from the queue. */
+ if (!IS_ERR(msg)) {
+ /*
+ * Found a suitable message.
+ * Unlink it from the queue.
+ */
if ((msgsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
msg = ERR_PTR(-E2BIG);
goto out_unlock;
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);
- ss_wakeup(&msq->q_senders,0);
+ atomic_sub(msg->m_ts, &ns->msg_bytes);
+ atomic_dec(&ns->msg_hdrs);
+ ss_wakeup(&msq->q_senders, 0);
msg_unlock(msq);
break;
}
msg = ERR_PTR(-ENOMSG);
goto out_unlock;
}
- list_add_tail(&msr_d.r_list,&msq->q_receivers);
+ list_add_tail(&msr_d.r_list, &msq->q_receivers);
msr_d.r_tsk = current;
msr_d.r_msgtype = msgtyp;
msr_d.r_mode = mode;
- if(msgflg & MSG_NOERROR)
+ if (msgflg & MSG_NOERROR)
msr_d.r_maxsize = INT_MAX;
- else
+ else
msr_d.r_maxsize = msgsz;
msr_d.r_msg = ERR_PTR(-EAGAIN);
current->state = TASK_INTERRUPTIBLE;
* Disable preemption. 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
- * existance of msq:
+ * existence of msq:
* Prior to destruction, expunge_all(-EIRDM) changes r_msg.
* Thus if r_msg is -EAGAIN, then the queue not yet destroyed.
* rcu_read_lock() prevents preemption between reading r_msg
* wake_up_process(). There is a race with exit(), see
* ipc/mqueue.c for the details.
*/
- msg = (struct msg_msg*) msr_d.r_msg;
+ msg = (struct msg_msg*)msr_d.r_msg;
while (msg == NULL) {
cpu_relax();
- msg = (struct msg_msg*) msr_d.r_msg;
+ msg = (struct msg_msg *)msr_d.r_msg;
}
/* Lockless receive, part 3:
* If there is a message or an error then accept it without
* locking.
*/
- if(msg != ERR_PTR(-EAGAIN)) {
+ if (msg != ERR_PTR(-EAGAIN)) {
rcu_read_unlock();
break;
}
* Repeat test after acquiring the spinlock.
*/
msg = (struct msg_msg*)msr_d.r_msg;
- if(msg != ERR_PTR(-EAGAIN))
+ if (msg != ERR_PTR(-EAGAIN))
goto out_unlock;
list_del(&msr_d.r_list);
}
}
if (IS_ERR(msg))
- return PTR_ERR(msg);
+ 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)) {
- msgsz = -EFAULT;
- }
+ *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)
{
struct msg_queue *msq = 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.mode,
- msq->q_cbytes,
- msq->q_qnum,
- msq->q_lspid,
- msq->q_lrpid,
- msq->q_perm.uid,
- msq->q_perm.gid,
- msq->q_perm.cuid,
- msq->q_perm.cgid,
- msq->q_stime,
- msq->q_rtime,
- msq->q_ctime);
+ "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
+ msq->q_perm.key,
+ msq->q_perm.id,
+ msq->q_perm.mode,
+ msq->q_cbytes,
+ msq->q_qnum,
+ msq->q_lspid,
+ msq->q_lrpid,
+ msq->q_perm.uid,
+ msq->q_perm.gid,
+ msq->q_perm.cuid,
+ msq->q_perm.cgid,
+ msq->q_stime,
+ msq->q_rtime,
+ msq->q_ctime);
}
#endif
Code Review / linux-2.6.git / blobdiff