forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1356 lines
32 KiB
1356 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* linux/ipc/msg.c |
|
* Copyright (C) 1992 Krishna Balasubramanian |
|
* |
|
* 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 <[email protected]> |
|
* |
|
* mostly rewritten, threaded and wake-one semantics added |
|
* MSGMAX limit removed, sysctl's added |
|
* (c) 1999 Manfred Spraul <[email protected]> |
|
* |
|
* support for audit of ipc object properties and permission changes |
|
* Dustin Kirkland <[email protected]> |
|
* |
|
* namespaces support |
|
* OpenVZ, SWsoft Inc. |
|
* Pavel Emelianov <[email protected]> |
|
*/ |
|
|
|
#include <linux/capability.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/sched/wake_q.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 <linux/rhashtable.h> |
|
|
|
#include <asm/current.h> |
|
#include <linux/uaccess.h> |
|
#include "util.h" |
|
|
|
/* 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 */ |
|
struct pid *q_lspid; /* pid of last msgsnd */ |
|
struct pid *q_lrpid; /* last receive pid */ |
|
|
|
struct list_head q_messages; |
|
struct list_head q_receivers; |
|
struct list_head q_senders; |
|
} __randomize_layout; |
|
|
|
/* |
|
* 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 |
|
*/ |
|
|
|
/* one msg_receiver structure for each sleeping receiver */ |
|
struct msg_receiver { |
|
struct list_head r_list; |
|
struct task_struct *r_tsk; |
|
|
|
int r_mode; |
|
long r_msgtype; |
|
long r_maxsize; |
|
|
|
struct msg_msg *r_msg; |
|
}; |
|
|
|
/* one msg_sender for each sleeping sender */ |
|
struct msg_sender { |
|
struct list_head list; |
|
struct task_struct *tsk; |
|
size_t msgsz; |
|
}; |
|
|
|
#define SEARCH_ANY 1 |
|
#define SEARCH_EQUAL 2 |
|
#define SEARCH_NOTEQUAL 3 |
|
#define SEARCH_LESSEQUAL 4 |
|
#define SEARCH_NUMBER 5 |
|
|
|
#define msg_ids(ns) ((ns)->ids[IPC_MSG_IDS]) |
|
|
|
static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id) |
|
{ |
|
struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id); |
|
|
|
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); |
|
} |
|
|
|
static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s) |
|
{ |
|
ipc_rmid(&msg_ids(ns), &s->q_perm); |
|
} |
|
|
|
static void msg_rcu_free(struct rcu_head *head) |
|
{ |
|
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); |
|
|
|
security_msg_queue_free(&msq->q_perm); |
|
kfree(msq); |
|
} |
|
|
|
/** |
|
* newque - Create a new msg queue |
|
* @ns: namespace |
|
* @params: ptr to the structure that contains the key and msgflg |
|
* |
|
* Called with msg_ids.rwsem held (writer) |
|
*/ |
|
static int newque(struct ipc_namespace *ns, struct ipc_params *params) |
|
{ |
|
struct msg_queue *msq; |
|
int retval; |
|
key_t key = params->key; |
|
int msgflg = params->flg; |
|
|
|
msq = kmalloc(sizeof(*msq), GFP_KERNEL_ACCOUNT); |
|
if (unlikely(!msq)) |
|
return -ENOMEM; |
|
|
|
msq->q_perm.mode = msgflg & S_IRWXUGO; |
|
msq->q_perm.key = key; |
|
|
|
msq->q_perm.security = NULL; |
|
retval = security_msg_queue_alloc(&msq->q_perm); |
|
if (retval) { |
|
kfree(msq); |
|
return retval; |
|
} |
|
|
|
msq->q_stime = msq->q_rtime = 0; |
|
msq->q_ctime = ktime_get_real_seconds(); |
|
msq->q_cbytes = msq->q_qnum = 0; |
|
msq->q_qbytes = ns->msg_ctlmnb; |
|
msq->q_lspid = msq->q_lrpid = NULL; |
|
INIT_LIST_HEAD(&msq->q_messages); |
|
INIT_LIST_HEAD(&msq->q_receivers); |
|
INIT_LIST_HEAD(&msq->q_senders); |
|
|
|
/* ipc_addid() locks msq upon success. */ |
|
retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); |
|
if (retval < 0) { |
|
ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
|
return retval; |
|
} |
|
|
|
ipc_unlock_object(&msq->q_perm); |
|
rcu_read_unlock(); |
|
|
|
return msq->q_perm.id; |
|
} |
|
|
|
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) |
|
{ |
|
mss->tsk = current; |
|
mss->msgsz = msgsz; |
|
/* |
|
* No memory barrier required: we did ipc_lock_object(), |
|
* and the waker obtains that lock before calling wake_q_add(). |
|
*/ |
|
__set_current_state(TASK_INTERRUPTIBLE); |
|
list_add_tail(&mss->list, &msq->q_senders); |
|
} |
|
|
|
static inline void ss_del(struct msg_sender *mss) |
|
{ |
|
if (mss->list.next) |
|
list_del(&mss->list); |
|
} |
|
|
|
static void ss_wakeup(struct msg_queue *msq, |
|
struct wake_q_head *wake_q, bool kill) |
|
{ |
|
struct msg_sender *mss, *t; |
|
struct task_struct *stop_tsk = NULL; |
|
struct list_head *h = &msq->q_senders; |
|
|
|
list_for_each_entry_safe(mss, t, h, list) { |
|
if (kill) |
|
mss->list.next = NULL; |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
wake_q_add(wake_q, mss->tsk); |
|
} |
|
} |
|
|
|
static void expunge_all(struct msg_queue *msq, int res, |
|
struct wake_q_head *wake_q) |
|
{ |
|
struct msg_receiver *msr, *t; |
|
|
|
list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
|
struct task_struct *r_tsk; |
|
|
|
r_tsk = get_task_struct(msr->r_tsk); |
|
|
|
/* see MSG_BARRIER for purpose/pairing */ |
|
smp_store_release(&msr->r_msg, ERR_PTR(res)); |
|
wake_q_add_safe(wake_q, r_tsk); |
|
} |
|
} |
|
|
|
/* |
|
* 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.rwsem (writer) and the spinlock for this message queue are held |
|
* before freeque() is called. msg_ids.rwsem remains locked on exit. |
|
*/ |
|
static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
|
__releases(RCU) |
|
__releases(&msq->q_perm) |
|
{ |
|
struct msg_msg *msg, *t; |
|
struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
|
DEFINE_WAKE_Q(wake_q); |
|
|
|
expunge_all(msq, -EIDRM, &wake_q); |
|
ss_wakeup(msq, &wake_q, true); |
|
msg_rmid(ns, msq); |
|
ipc_unlock_object(&msq->q_perm); |
|
wake_up_q(&wake_q); |
|
rcu_read_unlock(); |
|
|
|
list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) { |
|
atomic_dec(&ns->msg_hdrs); |
|
free_msg(msg); |
|
} |
|
atomic_sub(msq->q_cbytes, &ns->msg_bytes); |
|
ipc_update_pid(&msq->q_lspid, NULL); |
|
ipc_update_pid(&msq->q_lrpid, NULL); |
|
ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
|
} |
|
|
|
long ksys_msgget(key_t key, int msgflg) |
|
{ |
|
struct ipc_namespace *ns; |
|
static const struct ipc_ops msg_ops = { |
|
.getnew = newque, |
|
.associate = security_msg_queue_associate, |
|
}; |
|
struct ipc_params msg_params; |
|
|
|
ns = current->nsproxy->ipc_ns; |
|
|
|
msg_params.key = key; |
|
msg_params.flg = msgflg; |
|
|
|
return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params); |
|
} |
|
|
|
SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg) |
|
{ |
|
return ksys_msgget(key, msgflg); |
|
} |
|
|
|
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)); |
|
case IPC_OLD: |
|
{ |
|
struct msqid_ds out; |
|
|
|
memset(&out, 0, sizeof(out)); |
|
|
|
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; |
|
|
|
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) |
|
out.msg_qnum = USHRT_MAX; |
|
else |
|
out.msg_qnum = in->msg_qnum; |
|
|
|
if (in->msg_qbytes > USHRT_MAX) |
|
out.msg_qbytes = USHRT_MAX; |
|
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; |
|
|
|
return copy_to_user(buf, &out, sizeof(out)); |
|
} |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static inline unsigned long |
|
copy_msqid_from_user(struct msqid64_ds *out, void __user *buf, int version) |
|
{ |
|
switch (version) { |
|
case IPC_64: |
|
if (copy_from_user(out, buf, sizeof(*out))) |
|
return -EFAULT; |
|
return 0; |
|
case IPC_OLD: |
|
{ |
|
struct msqid_ds tbuf_old; |
|
|
|
if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
|
return -EFAULT; |
|
|
|
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->msg_qbytes = tbuf_old.msg_lqbytes; |
|
else |
|
out->msg_qbytes = tbuf_old.msg_qbytes; |
|
|
|
return 0; |
|
} |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
/* |
|
* This function handles some msgctl commands which require the rwsem |
|
* to be held in write mode. |
|
* NOTE: no locks must be held, the rwsem is taken inside this function. |
|
*/ |
|
static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd, |
|
struct ipc64_perm *perm, int msg_qbytes) |
|
{ |
|
struct kern_ipc_perm *ipcp; |
|
struct msg_queue *msq; |
|
int err; |
|
|
|
down_write(&msg_ids(ns).rwsem); |
|
rcu_read_lock(); |
|
|
|
ipcp = ipcctl_obtain_check(ns, &msg_ids(ns), msqid, cmd, |
|
perm, msg_qbytes); |
|
if (IS_ERR(ipcp)) { |
|
err = PTR_ERR(ipcp); |
|
goto out_unlock1; |
|
} |
|
|
|
msq = container_of(ipcp, struct msg_queue, q_perm); |
|
|
|
err = security_msg_queue_msgctl(&msq->q_perm, cmd); |
|
if (err) |
|
goto out_unlock1; |
|
|
|
switch (cmd) { |
|
case IPC_RMID: |
|
ipc_lock_object(&msq->q_perm); |
|
/* freeque unlocks the ipc object and rcu */ |
|
freeque(ns, ipcp); |
|
goto out_up; |
|
case IPC_SET: |
|
{ |
|
DEFINE_WAKE_Q(wake_q); |
|
|
|
if (msg_qbytes > ns->msg_ctlmnb && |
|
!capable(CAP_SYS_RESOURCE)) { |
|
err = -EPERM; |
|
goto out_unlock1; |
|
} |
|
|
|
ipc_lock_object(&msq->q_perm); |
|
err = ipc_update_perm(perm, ipcp); |
|
if (err) |
|
goto out_unlock0; |
|
|
|
msq->q_qbytes = msg_qbytes; |
|
|
|
msq->q_ctime = ktime_get_real_seconds(); |
|
/* |
|
* Sleeping receivers might be excluded by |
|
* stricter permissions. |
|
*/ |
|
expunge_all(msq, -EAGAIN, &wake_q); |
|
/* |
|
* Sleeping senders might be able to send |
|
* due to a larger queue size. |
|
*/ |
|
ss_wakeup(msq, &wake_q, false); |
|
ipc_unlock_object(&msq->q_perm); |
|
wake_up_q(&wake_q); |
|
|
|
goto out_unlock1; |
|
} |
|
default: |
|
err = -EINVAL; |
|
goto out_unlock1; |
|
} |
|
|
|
out_unlock0: |
|
ipc_unlock_object(&msq->q_perm); |
|
out_unlock1: |
|
rcu_read_unlock(); |
|
out_up: |
|
up_write(&msg_ids(ns).rwsem); |
|
return err; |
|
} |
|
|
|
static int msgctl_info(struct ipc_namespace *ns, int msqid, |
|
int cmd, struct msginfo *msginfo) |
|
{ |
|
int err; |
|
int max_idx; |
|
|
|
/* |
|
* 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; |
|
} |
|
max_idx = ipc_get_maxidx(&msg_ids(ns)); |
|
up_read(&msg_ids(ns).rwsem); |
|
return (max_idx < 0) ? 0 : max_idx; |
|
} |
|
|
|
static int msgctl_stat(struct ipc_namespace *ns, int msqid, |
|
int cmd, struct msqid64_ds *p) |
|
{ |
|
struct msg_queue *msq; |
|
int err; |
|
|
|
memset(p, 0, sizeof(*p)); |
|
|
|
rcu_read_lock(); |
|
if (cmd == MSG_STAT || cmd == MSG_STAT_ANY) { |
|
msq = msq_obtain_object(ns, msqid); |
|
if (IS_ERR(msq)) { |
|
err = PTR_ERR(msq); |
|
goto out_unlock; |
|
} |
|
} else { /* IPC_STAT */ |
|
msq = msq_obtain_object_check(ns, msqid); |
|
if (IS_ERR(msq)) { |
|
err = PTR_ERR(msq); |
|
goto out_unlock; |
|
} |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
err = security_msg_queue_msgctl(&msq->q_perm, cmd); |
|
if (err) |
|
goto out_unlock; |
|
|
|
ipc_lock_object(&msq->q_perm); |
|
|
|
if (!ipc_valid_object(&msq->q_perm)) { |
|
ipc_unlock_object(&msq->q_perm); |
|
err = -EIDRM; |
|
goto out_unlock; |
|
} |
|
|
|
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; |
|
#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 |
|
p->msg_cbytes = msq->q_cbytes; |
|
p->msg_qnum = msq->q_qnum; |
|
p->msg_qbytes = msq->q_qbytes; |
|
p->msg_lspid = pid_vnr(msq->q_lspid); |
|
p->msg_lrpid = pid_vnr(msq->q_lrpid); |
|
|
|
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; |
|
} |
|
|
|
ipc_unlock_object(&msq->q_perm); |
|
out_unlock: |
|
rcu_read_unlock(); |
|
return err; |
|
} |
|
|
|
static long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf, int version) |
|
{ |
|
struct ipc_namespace *ns; |
|
struct msqid64_ds msqid64; |
|
int err; |
|
|
|
if (msqid < 0 || cmd < 0) |
|
return -EINVAL; |
|
|
|
ns = current->nsproxy->ipc_ns; |
|
|
|
switch (cmd) { |
|
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(buf, &msginfo, sizeof(struct msginfo))) |
|
err = -EFAULT; |
|
return err; |
|
} |
|
case MSG_STAT: /* msqid is an index rather than a msg queue id */ |
|
case MSG_STAT_ANY: |
|
case IPC_STAT: |
|
err = msgctl_stat(ns, msqid, cmd, &msqid64); |
|
if (err < 0) |
|
return err; |
|
if (copy_msqid_to_user(buf, &msqid64, version)) |
|
err = -EFAULT; |
|
return err; |
|
case IPC_SET: |
|
if (copy_msqid_from_user(&msqid64, buf, version)) |
|
return -EFAULT; |
|
return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm, |
|
msqid64.msg_qbytes); |
|
case IPC_RMID: |
|
return msgctl_down(ns, msqid, cmd, NULL, 0); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf) |
|
{ |
|
return ksys_msgctl(msqid, cmd, buf, IPC_64); |
|
} |
|
|
|
#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 |
|
|
|
#ifdef CONFIG_COMPAT |
|
|
|
struct compat_msqid_ds { |
|
struct compat_ipc_perm msg_perm; |
|
compat_uptr_t msg_first; |
|
compat_uptr_t msg_last; |
|
old_time32_t msg_stime; |
|
old_time32_t msg_rtime; |
|
old_time32_t msg_ctime; |
|
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) { |
|
struct compat_msqid64_ds __user *p = buf; |
|
if (get_compat_ipc64_perm(&out->msg_perm, &p->msg_perm)) |
|
return -EFAULT; |
|
if (get_user(out->msg_qbytes, &p->msg_qbytes)) |
|
return -EFAULT; |
|
} else { |
|
struct compat_msqid_ds __user *p = buf; |
|
if (get_compat_ipc_perm(&out->msg_perm, &p->msg_perm)) |
|
return -EFAULT; |
|
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)); |
|
to_compat_ipc64_perm(&v.msg_perm, &in->msg_perm); |
|
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); |
|
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)); |
|
to_compat_ipc_perm(&v.msg_perm, &in->msg_perm); |
|
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)); |
|
} |
|
} |
|
|
|
static long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr, int version) |
|
{ |
|
struct ipc_namespace *ns; |
|
int err; |
|
struct msqid64_ds msqid64; |
|
|
|
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: |
|
case MSG_STAT_ANY: |
|
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; |
|
return msgctl_down(ns, msqid, cmd, &msqid64.msg_perm, msqid64.msg_qbytes); |
|
case IPC_RMID: |
|
return msgctl_down(ns, msqid, cmd, NULL, 0); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr) |
|
{ |
|
return compat_ksys_msgctl(msqid, cmd, uptr, IPC_64); |
|
} |
|
|
|
#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 |
|
#endif |
|
|
|
static int testmsg(struct msg_msg *msg, long type, int mode) |
|
{ |
|
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) |
|
return 1; |
|
break; |
|
case SEARCH_NOTEQUAL: |
|
if (msg->m_type != type) |
|
return 1; |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, |
|
struct wake_q_head *wake_q) |
|
{ |
|
struct msg_receiver *msr, *t; |
|
|
|
list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { |
|
if (testmsg(msg, msr->r_msgtype, msr->r_mode) && |
|
!security_msg_queue_msgrcv(&msq->q_perm, msg, msr->r_tsk, |
|
msr->r_msgtype, msr->r_mode)) { |
|
|
|
list_del(&msr->r_list); |
|
if (msr->r_maxsize < msg->m_ts) { |
|
wake_q_add(wake_q, msr->r_tsk); |
|
|
|
/* See expunge_all regarding memory barrier */ |
|
smp_store_release(&msr->r_msg, ERR_PTR(-E2BIG)); |
|
} else { |
|
ipc_update_pid(&msq->q_lrpid, task_pid(msr->r_tsk)); |
|
msq->q_rtime = ktime_get_real_seconds(); |
|
|
|
wake_q_add(wake_q, msr->r_tsk); |
|
|
|
/* See expunge_all regarding memory barrier */ |
|
smp_store_release(&msr->r_msg, msg); |
|
return 1; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static long do_msgsnd(int msqid, long mtype, void __user *mtext, |
|
size_t msgsz, int msgflg) |
|
{ |
|
struct msg_queue *msq; |
|
struct msg_msg *msg; |
|
int err; |
|
struct ipc_namespace *ns; |
|
DEFINE_WAKE_Q(wake_q); |
|
|
|
ns = current->nsproxy->ipc_ns; |
|
|
|
if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) |
|
return -EINVAL; |
|
if (mtype < 1) |
|
return -EINVAL; |
|
|
|
msg = load_msg(mtext, msgsz); |
|
if (IS_ERR(msg)) |
|
return PTR_ERR(msg); |
|
|
|
msg->m_type = mtype; |
|
msg->m_ts = msgsz; |
|
|
|
rcu_read_lock(); |
|
msq = msq_obtain_object_check(ns, msqid); |
|
if (IS_ERR(msq)) { |
|
err = PTR_ERR(msq); |
|
goto out_unlock1; |
|
} |
|
|
|
ipc_lock_object(&msq->q_perm); |
|
|
|
for (;;) { |
|
struct msg_sender s; |
|
|
|
err = -EACCES; |
|
if (ipcperms(ns, &msq->q_perm, S_IWUGO)) |
|
goto out_unlock0; |
|
|
|
/* raced with RMID? */ |
|
if (!ipc_valid_object(&msq->q_perm)) { |
|
err = -EIDRM; |
|
goto out_unlock0; |
|
} |
|
|
|
err = security_msg_queue_msgsnd(&msq->q_perm, msg, msgflg); |
|
if (err) |
|
goto out_unlock0; |
|
|
|
if (msg_fits_inqueue(msq, msgsz)) |
|
break; |
|
|
|
/* queue full, wait: */ |
|
if (msgflg & IPC_NOWAIT) { |
|
err = -EAGAIN; |
|
goto out_unlock0; |
|
} |
|
|
|
/* enqueue the sender and prepare to block */ |
|
ss_add(msq, &s, msgsz); |
|
|
|
if (!ipc_rcu_getref(&msq->q_perm)) { |
|
err = -EIDRM; |
|
goto out_unlock0; |
|
} |
|
|
|
ipc_unlock_object(&msq->q_perm); |
|
rcu_read_unlock(); |
|
schedule(); |
|
|
|
rcu_read_lock(); |
|
ipc_lock_object(&msq->q_perm); |
|
|
|
ipc_rcu_putref(&msq->q_perm, msg_rcu_free); |
|
/* raced with RMID? */ |
|
if (!ipc_valid_object(&msq->q_perm)) { |
|
err = -EIDRM; |
|
goto out_unlock0; |
|
} |
|
ss_del(&s); |
|
|
|
if (signal_pending(current)) { |
|
err = -ERESTARTNOHAND; |
|
goto out_unlock0; |
|
} |
|
|
|
} |
|
|
|
ipc_update_pid(&msq->q_lspid, task_tgid(current)); |
|
msq->q_stime = ktime_get_real_seconds(); |
|
|
|
if (!pipelined_send(msq, msg, &wake_q)) { |
|
/* 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, &ns->msg_bytes); |
|
atomic_inc(&ns->msg_hdrs); |
|
} |
|
|
|
err = 0; |
|
msg = NULL; |
|
|
|
out_unlock0: |
|
ipc_unlock_object(&msq->q_perm); |
|
wake_up_q(&wake_q); |
|
out_unlock1: |
|
rcu_read_unlock(); |
|
if (msg != NULL) |
|
free_msg(msg); |
|
return err; |
|
} |
|
|
|
long ksys_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); |
|
} |
|
|
|
SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
|
int, msgflg) |
|
{ |
|
return ksys_msgsnd(msqid, msgp, msgsz, msgflg); |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
|
|
struct compat_msgbuf { |
|
compat_long_t mtype; |
|
char mtext[1]; |
|
}; |
|
|
|
long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp, |
|
compat_ssize_t msgsz, int msgflg) |
|
{ |
|
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); |
|
} |
|
|
|
COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, |
|
compat_ssize_t, msgsz, int, msgflg) |
|
{ |
|
return compat_ksys_msgsnd(msqid, msgp, msgsz, msgflg); |
|
} |
|
#endif |
|
|
|
static inline int convert_mode(long *msgtyp, int msgflg) |
|
{ |
|
if (msgflg & MSG_COPY) |
|
return SEARCH_NUMBER; |
|
/* |
|
* 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). |
|
*/ |
|
if (*msgtyp == 0) |
|
return SEARCH_ANY; |
|
if (*msgtyp < 0) { |
|
if (*msgtyp == LONG_MIN) /* -LONG_MIN is undefined */ |
|
*msgtyp = LONG_MAX; |
|
else |
|
*msgtyp = -*msgtyp; |
|
return SEARCH_LESSEQUAL; |
|
} |
|
if (msgflg & MSG_EXCEPT) |
|
return SEARCH_NOTEQUAL; |
|
return SEARCH_EQUAL; |
|
} |
|
|
|
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; |
|
} |
|
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE |
|
/* |
|
* This function creates new kernel message structure, large enough to store |
|
* bufsz message bytes. |
|
*/ |
|
static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
|
{ |
|
struct msg_msg *copy; |
|
|
|
/* |
|
* Create dummy message to copy real message to. |
|
*/ |
|
copy = load_msg(buf, bufsz); |
|
if (!IS_ERR(copy)) |
|
copy->m_ts = bufsz; |
|
return copy; |
|
} |
|
|
|
static inline void free_copy(struct msg_msg *copy) |
|
{ |
|
if (copy) |
|
free_msg(copy); |
|
} |
|
#else |
|
static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz) |
|
{ |
|
return ERR_PTR(-ENOSYS); |
|
} |
|
|
|
static inline void free_copy(struct msg_msg *copy) |
|
{ |
|
} |
|
#endif |
|
|
|
static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) |
|
{ |
|
struct msg_msg *msg, *found = NULL; |
|
long count = 0; |
|
|
|
list_for_each_entry(msg, &msq->q_messages, m_list) { |
|
if (testmsg(msg, *msgtyp, mode) && |
|
!security_msg_queue_msgrcv(&msq->q_perm, msg, current, |
|
*msgtyp, mode)) { |
|
if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { |
|
*msgtyp = msg->m_type - 1; |
|
found = msg; |
|
} else if (mode == SEARCH_NUMBER) { |
|
if (*msgtyp == count) |
|
return msg; |
|
} else |
|
return msg; |
|
count++; |
|
} |
|
} |
|
|
|
return found ?: ERR_PTR(-EAGAIN); |
|
} |
|
|
|
static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, |
|
long (*msg_handler)(void __user *, struct msg_msg *, size_t)) |
|
{ |
|
int mode; |
|
struct msg_queue *msq; |
|
struct ipc_namespace *ns; |
|
struct msg_msg *msg, *copy = NULL; |
|
DEFINE_WAKE_Q(wake_q); |
|
|
|
ns = current->nsproxy->ipc_ns; |
|
|
|
if (msqid < 0 || (long) bufsz < 0) |
|
return -EINVAL; |
|
|
|
if (msgflg & MSG_COPY) { |
|
if ((msgflg & MSG_EXCEPT) || !(msgflg & IPC_NOWAIT)) |
|
return -EINVAL; |
|
copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax)); |
|
if (IS_ERR(copy)) |
|
return PTR_ERR(copy); |
|
} |
|
mode = convert_mode(&msgtyp, msgflg); |
|
|
|
rcu_read_lock(); |
|
msq = msq_obtain_object_check(ns, msqid); |
|
if (IS_ERR(msq)) { |
|
rcu_read_unlock(); |
|
free_copy(copy); |
|
return PTR_ERR(msq); |
|
} |
|
|
|
for (;;) { |
|
struct msg_receiver msr_d; |
|
|
|
msg = ERR_PTR(-EACCES); |
|
if (ipcperms(ns, &msq->q_perm, S_IRUGO)) |
|
goto out_unlock1; |
|
|
|
ipc_lock_object(&msq->q_perm); |
|
|
|
/* raced with RMID? */ |
|
if (!ipc_valid_object(&msq->q_perm)) { |
|
msg = ERR_PTR(-EIDRM); |
|
goto out_unlock0; |
|
} |
|
|
|
msg = find_msg(msq, &msgtyp, mode); |
|
if (!IS_ERR(msg)) { |
|
/* |
|
* Found a suitable message. |
|
* Unlink it from the queue. |
|
*/ |
|
if ((bufsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) { |
|
msg = ERR_PTR(-E2BIG); |
|
goto out_unlock0; |
|
} |
|
/* |
|
* If we are copying, then do not unlink message and do |
|
* not update queue parameters. |
|
*/ |
|
if (msgflg & MSG_COPY) { |
|
msg = copy_msg(msg, copy); |
|
goto out_unlock0; |
|
} |
|
|
|
list_del(&msg->m_list); |
|
msq->q_qnum--; |
|
msq->q_rtime = ktime_get_real_seconds(); |
|
ipc_update_pid(&msq->q_lrpid, task_tgid(current)); |
|
msq->q_cbytes -= msg->m_ts; |
|
atomic_sub(msg->m_ts, &ns->msg_bytes); |
|
atomic_dec(&ns->msg_hdrs); |
|
ss_wakeup(msq, &wake_q, false); |
|
|
|
goto out_unlock0; |
|
} |
|
|
|
/* No message waiting. Wait for a message */ |
|
if (msgflg & IPC_NOWAIT) { |
|
msg = ERR_PTR(-ENOMSG); |
|
goto out_unlock0; |
|
} |
|
|
|
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) |
|
msr_d.r_maxsize = INT_MAX; |
|
else |
|
msr_d.r_maxsize = bufsz; |
|
|
|
/* 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() */ |
|
__set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
ipc_unlock_object(&msq->q_perm); |
|
rcu_read_unlock(); |
|
schedule(); |
|
|
|
/* |
|
* 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: |
|
* Prior to destruction, expunge_all(-EIRDM) changes r_msg. |
|
* Thus if r_msg is -EAGAIN, then the queue not yet destroyed. |
|
*/ |
|
rcu_read_lock(); |
|
|
|
/* |
|
* 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. |
|
* |
|
* Should the process wake up before this wakeup (due to a |
|
* signal) it will either see the message and continue ... |
|
*/ |
|
msg = READ_ONCE(msr_d.r_msg); |
|
if (msg != ERR_PTR(-EAGAIN)) { |
|
/* see MSG_BARRIER for purpose/pairing */ |
|
smp_acquire__after_ctrl_dep(); |
|
|
|
goto out_unlock1; |
|
} |
|
|
|
/* |
|
* ... or see -EAGAIN, acquire the lock to check the message |
|
* again. |
|
*/ |
|
ipc_lock_object(&msq->q_perm); |
|
|
|
msg = READ_ONCE(msr_d.r_msg); |
|
if (msg != ERR_PTR(-EAGAIN)) |
|
goto out_unlock0; |
|
|
|
list_del(&msr_d.r_list); |
|
if (signal_pending(current)) { |
|
msg = ERR_PTR(-ERESTARTNOHAND); |
|
goto out_unlock0; |
|
} |
|
|
|
ipc_unlock_object(&msq->q_perm); |
|
} |
|
|
|
out_unlock0: |
|
ipc_unlock_object(&msq->q_perm); |
|
wake_up_q(&wake_q); |
|
out_unlock1: |
|
rcu_read_unlock(); |
|
if (IS_ERR(msg)) { |
|
free_copy(copy); |
|
return PTR_ERR(msg); |
|
} |
|
|
|
bufsz = msg_handler(buf, msg, bufsz); |
|
free_msg(msg); |
|
|
|
return bufsz; |
|
} |
|
|
|
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); |
|
} |
|
|
|
SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, |
|
long, msgtyp, int, msgflg) |
|
{ |
|
return ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg); |
|
} |
|
|
|
#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; |
|
} |
|
|
|
long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz, |
|
compat_long_t msgtyp, int msgflg) |
|
{ |
|
return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, |
|
msgflg, compat_do_msg_fill); |
|
} |
|
|
|
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); |
|
} |
|
#endif |
|
|
|
void msg_init_ns(struct ipc_namespace *ns) |
|
{ |
|
ns->msg_ctlmax = MSGMAX; |
|
ns->msg_ctlmnb = MSGMNB; |
|
ns->msg_ctlmni = MSGMNI; |
|
|
|
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); |
|
rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht); |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_PROC_FS |
|
static int sysvipc_msg_proc_show(struct seq_file *s, void *it) |
|
{ |
|
struct pid_namespace *pid_ns = ipc_seq_pid_ns(s); |
|
struct user_namespace *user_ns = seq_user_ns(s); |
|
struct kern_ipc_perm *ipcp = it; |
|
struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm); |
|
|
|
seq_printf(s, |
|
"%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10llu %10llu %10llu\n", |
|
msq->q_perm.key, |
|
msq->q_perm.id, |
|
msq->q_perm.mode, |
|
msq->q_cbytes, |
|
msq->q_qnum, |
|
pid_nr_ns(msq->q_lspid, pid_ns), |
|
pid_nr_ns(msq->q_lrpid, pid_ns), |
|
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; |
|
} |
|
#endif |
|
|
|
void __init msg_init(void) |
|
{ |
|
msg_init_ns(&init_ipc_ns); |
|
|
|
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); |
|
}
|
|
|