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/*
* linux/ipc/sem.c
* Copyright (C) 1992 Krishna Balasubramanian
* Copyright (C) 1995 Eric Schenk, Bruno Haible
*
* /proc/sysvipc/sem support (c) 1999 Dragos Acostachioaie <dragos@iname.com>
*
* SMP-threaded, sysctl's added
* (c) 1999 Manfred Spraul <manfred@colorfullife.com>
* Enforced range limit on SEM_UNDO
* (c) 2001 Red Hat Inc
* Lockless wakeup
* (c) 2003 Manfred Spraul <manfred@colorfullife.com>
* Further wakeup optimizations, documentation
* (c) 2010 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>
*
* Implementation notes: (May 2010)
* This file implements System V semaphores.
*
* User space visible behavior:
* - FIFO ordering for semop() operations (just FIFO, not starvation
* protection)
* - multiple semaphore operations that alter the same semaphore in
* one semop() are handled.
* - sem_ctime (time of last semctl()) is updated in the IPC_SET, SETVAL and
* SETALL calls.
* - two Linux specific semctl() commands: SEM_STAT, SEM_INFO.
* - undo adjustments at process exit are limited to 0..SEMVMX.
* - namespace are supported.
* - SEMMSL, SEMMNS, SEMOPM and SEMMNI can be configured at runtine by writing
* to /proc/sys/kernel/sem.
* - statistics about the usage are reported in /proc/sysvipc/sem.
*
* Internals:
* - scalability:
* - all global variables are read-mostly.
* - semop() calls and semctl(RMID) are synchronized by RCU.
* - most operations do write operations (actually: spin_lock calls) to
* the per-semaphore array structure.
* Thus: Perfect SMP scaling between independent semaphore arrays.
* If multiple semaphores in one array are used, then cache line
* trashing on the semaphore array spinlock will limit the scaling.
* - semncnt and semzcnt are calculated on demand in count_semncnt() and
* count_semzcnt()
* - the task that performs a successful semop() scans the list of all
* sleeping tasks and completes any pending operations that can be fulfilled.
* Semaphores are actively given to waiting tasks (necessary for FIFO).
* (see update_queue())
* - To improve the scalability, the actual wake-up calls are performed after
* dropping all locks. (see wake_up_sem_queue_prepare(),
* wake_up_sem_queue_do())
* - All work is done by the waker, the woken up task does not have to do
* anything - not even acquiring a lock or dropping a refcount.
* - A woken up task may not even touch the semaphore array anymore, it may
* have been destroyed already by a semctl(RMID).
* - The synchronizations between wake-ups due to a timeout/signal and a
* wake-up due to a completed semaphore operation is achieved by using an
* intermediate state (IN_WAKEUP).
* - UNDO values are stored in an array (one per process and per
* semaphore array, lazily allocated). For backwards compatibility, multiple
* modes for the UNDO variables are supported (per process, per thread)
* (see copy_semundo, CLONE_SYSVSEM)
* - There are two lists of the pending operations: a per-array list
* and per-semaphore list (stored in the array). This allows to achieve FIFO
* ordering without always scanning all pending operations.
* The worst-case behavior is nevertheless O(N^2) for N wakeups.
*/

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/time.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/ipc_namespace.h>

#include <asm/uaccess.h>
#include "util.h"

/* One semaphore structure for each semaphore in the system. */
struct sem {
int semval; /* current value */
int sempid; /* pid of last operation */
struct list_head sem_pending; /* pending single-sop operations */
};

/* One queue for each sleeping process in the system. */
struct sem_queue {
struct list_head simple_list; /* queue of pending operations */
struct list_head list; /* queue of pending operations */
struct task_struct *sleeper; /* this process */
struct sem_undo *undo; /* undo structure */
int pid; /* process id of requesting process */
int status; /* completion status of operation */
struct sembuf *sops; /* array of pending operations */
int nsops; /* number of operations */
int alter; /* does *sops alter the array? */
};

/* Each task has a list of undo requests. They are executed automatically
* when the process exits.
*/
struct sem_undo {
struct list_head list_proc; /* per-process list: *
* all undos from one process
* rcu protected */
struct rcu_head rcu; /* rcu struct for sem_undo */
struct sem_undo_list *ulp; /* back ptr to sem_undo_list */
struct list_head list_id; /* per semaphore array list:
* all undos for one array */
int semid; /* semaphore set identifier */
short *semadj; /* array of adjustments */
/* one per semaphore */
};

/* sem_undo_list controls shared access to the list of sem_undo structures
* that may be shared among all a CLONE_SYSVSEM task group.
*/
struct sem_undo_list {
atomic_t refcnt;
spinlock_t lock;
struct list_head list_proc;
};


#define sem_ids(ns) ((ns)->ids[IPC_SEM_IDS])

#define sem_unlock(sma) ipc_unlock(&(sma)->sem_perm)
#define sem_checkid(sma, semid) ipc_checkid(&sma->sem_perm, semid)

static int newary(struct ipc_namespace *, struct ipc_params *);
static void freeary(struct ipc_namespace *, struct kern_ipc_perm *);
#ifdef CONFIG_PROC_FS
static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
#endif

#define SEMMSL_FAST 256 /* 512 bytes on stack */
#define SEMOPM_FAST 64 /* ~ 372 bytes on stack */

/*
* linked list protection:
* sem_undo.id_next,
* sem_array.sem_pending{,last},
* sem_array.sem_undo: sem_lock() for read/write
* sem_undo.proc_next: only "current" is allowed to read/write that field.
*
*/

#define sc_semmsl sem_ctls[0]
#define sc_semmns sem_ctls[1]
#define sc_semopm sem_ctls[2]
#define sc_semmni sem_ctls[3]

void sem_init_ns(struct ipc_namespace *ns)
{
ns->sc_semmsl = SEMMSL;
ns->sc_semmns = SEMMNS;
ns->sc_semopm = SEMOPM;
ns->sc_semmni = SEMMNI;
ns->used_sems = 0;
ipc_init_ids(&ns->ids[IPC_SEM_IDS]);
}

#ifdef CONFIG_IPC_NS
void sem_exit_ns(struct ipc_namespace *ns)
{
free_ipcs(ns, &sem_ids(ns), freeary);
idr_destroy(&ns->ids[IPC_SEM_IDS].ipcs_idr);
}
#endif

void __init sem_init (void)
{
sem_init_ns(&init_ipc_ns);
ipc_init_proc_interface("sysvipc/sem",
" key semid perms nsems uid gid cuid cgid otime ctime\n",
IPC_SEM_IDS, sysvipc_sem_proc_show);
}

/*
* sem_lock_(check_) routines are called in the paths where the rw_mutex
* is not held.
*/
static inline struct sem_array *sem_lock(struct ipc_namespace *ns, int id)
{
struct kern_ipc_perm *ipcp = ipc_lock(&sem_ids(ns), id);

if (IS_ERR(ipcp))
return (struct sem_array *)ipcp;

return container_of(ipcp, struct sem_array, sem_perm);
}

static inline struct sem_array *sem_lock_check(struct ipc_namespace *ns,
int id)
{
struct kern_ipc_perm *ipcp = ipc_lock_check(&sem_ids(ns), id);

if (IS_ERR(ipcp))
return (struct sem_array *)ipcp;

return container_of(ipcp, struct sem_array, sem_perm);
}

static inline void sem_lock_and_putref(struct sem_array *sma)
{
ipc_lock_by_ptr(&sma->sem_perm);
ipc_rcu_putref(sma);
}

static inline void sem_getref_and_unlock(struct sem_array *sma)
{
ipc_rcu_getref(sma);
ipc_unlock(&(sma)->sem_perm);
}

static inline void sem_putref(struct sem_array *sma)
{
ipc_lock_by_ptr(&sma->sem_perm);
ipc_rcu_putref(sma);
ipc_unlock(&(sma)->sem_perm);
}

static inline void sem_rmid(struct ipc_namespace *ns, struct sem_array *s)
{
ipc_rmid(&sem_ids(ns), &s->sem_perm);
}

/*
* Lockless wakeup algorithm:
* Without the check/retry algorithm a lockless wakeup is possible:
* - queue.status is initialized to -EINTR before blocking.
* - wakeup is performed by
* * unlinking the queue entry from sma->sem_pending
* * setting queue.status to IN_WAKEUP
* This is the notification for the blocked thread that a
* result value is imminent.
* * call wake_up_process
* * set queue.status to the final value.
* - the previously blocked thread checks queue.status:
* * if it's IN_WAKEUP, then it must wait until the value changes
* * if it's not -EINTR, then the operation was completed by
* update_queue. semtimedop can return queue.status without
* performing any operation on the sem array.
* * otherwise it must acquire the spinlock and check what's up.
*
* The two-stage algorithm is necessary to protect against the following
* races:
* - if queue.status is set after wake_up_process, then the woken up idle
* thread could race forward and try (and fail) to acquire sma->lock
* before update_queue had a chance to set queue.status
* - if queue.status is written before wake_up_process and if the
* blocked process is woken up by a signal between writing
* queue.status and the wake_up_process, then the woken up
* process could return from semtimedop and die by calling
* sys_exit before wake_up_process is called. Then wake_up_process
* will oops, because the task structure is already invalid.
* (yes, this happened on s390 with sysv msg).
*
*/
#define IN_WAKEUP 1

/**
* newary - Create a new semaphore set
* @ns: namespace
* @params: ptr to the structure that contains key, semflg and nsems
*
* Called with sem_ids.rw_mutex held (as a writer)
*/

static int newary(struct ipc_namespace *ns, struct ipc_params *params)
{
int id;
int retval;
struct sem_array *sma;
int size;
key_t key = params->key;
int nsems = params->u.nsems;
int semflg = params->flg;
int i;

if (!nsems)
return -EINVAL;
if (ns->used_sems + nsems > ns->sc_semmns)
return -ENOSPC;

size = sizeof (*sma) + nsems * sizeof (struct sem);
sma = ipc_rcu_alloc(size);
if (!sma) {
return -ENOMEM;
}
memset (sma, 0, size);

sma->sem_perm.mode = (semflg & S_IRWXUGO);
sma->sem_perm.key = key;

sma->sem_perm.security = NULL;
retval = security_sem_alloc(sma);
if (retval) {
ipc_rcu_putref(sma);
return retval;
}

id = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni);
if (id < 0) {
security_sem_free(sma);
ipc_rcu_putref(sma);
return id;
}
ns->used_sems += nsems;

sma->sem_base = (struct sem *) &sma[1];

for (i = 0; i < nsems; i++)
INIT_LIST_HEAD(&sma->sem_base[i].sem_pending);

sma->complex_count = 0;
INIT_LIST_HEAD(&sma->sem_pending);
INIT_LIST_HEAD(&sma->list_id);
sma->sem_nsems = nsems;
sma->sem_ctime = get_seconds();
sem_unlock(sma);

return sma->sem_perm.id;
}


/*
* Called with sem_ids.rw_mutex and ipcp locked.
*/
static inline int sem_security(struct kern_ipc_perm *ipcp, int semflg)
{
struct sem_array *sma;

sma = container_of(ipcp, struct sem_array, sem_perm);
return security_sem_associate(sma, semflg);
}

/*
* Called with sem_ids.rw_mutex and ipcp locked.
*/
static inline int sem_more_checks(struct kern_ipc_perm *ipcp,
struct ipc_params *params)
{
struct sem_array *sma;

sma = container_of(ipcp, struct sem_array, sem_perm);
if (params->u.nsems > sma->sem_nsems)
return -EINVAL;

return 0;
}

SYSCALL_DEFINE3(semget, key_t, key, int, nsems, int, semflg)
{
struct ipc_namespace *ns;
struct ipc_ops sem_ops;
struct ipc_params sem_params;

ns = current->nsproxy->ipc_ns;

if (nsems < 0 || nsems > ns->sc_semmsl)
return -EINVAL;

sem_ops.getnew = newary;
sem_ops.associate = sem_security;
sem_ops.more_checks = sem_more_checks;

sem_params.key = key;
sem_params.flg = semflg;
sem_params.u.nsems = nsems;

return ipcget(ns, &sem_ids(ns), &sem_ops, &sem_params);
}

/*
* Determine whether a sequence of semaphore operations would succeed
* all at once. Return 0 if yes, 1 if need to sleep, else return error code.
*/

static int try_atomic_semop (struct sem_array * sma, struct sembuf * sops,
int nsops, struct sem_undo *un, int pid)
{
int result, sem_op;
struct sembuf *sop;
struct sem * curr;

for (sop = sops; sop < sops + nsops; sop++) {
curr = sma->sem_base + sop->sem_num;
sem_op = sop->sem_op;
result = curr->semval;
  
if (!sem_op && result)
goto would_block;

result += sem_op;
if (result < 0)
goto would_block;
if (result > SEMVMX)
goto out_of_range;
if (sop->sem_flg & SEM_UNDO) {
int undo = un->semadj[sop->sem_num] - sem_op;
/*
* Exceeding the undo range is an error.
*/
if (undo < (-SEMAEM - 1) || undo > SEMAEM)
goto out_of_range;
}
curr->semval = result;
}

sop--;
while (sop >= sops) {
sma->sem_base[sop->sem_num].sempid = pid;
if (sop->sem_flg & SEM_UNDO)
un->semadj[sop->sem_num] -= sop->sem_op;
sop--;
}

return 0;

out_of_range:
result = -ERANGE;
goto undo;

would_block:
if (sop->sem_flg & IPC_NOWAIT)
result = -EAGAIN;
else
result = 1;

undo:
sop--;
while (sop >= sops) {
sma->sem_base[sop->sem_num].semval -= sop->sem_op;
sop--;
}

return result;
}

/** wake_up_sem_queue_prepare(q, error): Prepare wake-up
* @q: queue entry that must be signaled
* @error: Error value for the signal
*
* Prepare the wake-up of the queue entry q.
*/
static void wake_up_sem_queue_prepare(struct list_head *pt,
struct sem_queue *q, int error)
{
if (list_empty(pt)) {
/*
* Hold preempt off so that we don't get preempted and have the
* wakee busy-wait until we're scheduled back on.
*/
preempt_disable();
}
q->status = IN_WAKEUP;
q->pid = error;

list_add_tail(&q->simple_list, pt);
}

/**
* wake_up_sem_queue_do(pt) - do the actual wake-up
* @pt: list of tasks to be woken up
*
* Do the actual wake-up.
* The function is called without any locks held, thus the semaphore array
* could be destroyed already and the tasks can disappear as soon as the
* status is set to the actual return code.
*/
static void wake_up_sem_queue_do(struct list_head *pt)
{
struct sem_queue *q, *t;
int did_something;

did_something = !list_empty(pt);
list_for_each_entry_safe(q, t, pt, simple_list) {
wake_up_process(q->sleeper);
/* q can disappear immediately after writing q->status. */
smp_wmb();
q->status = q->pid;
}
if (did_something)
preempt_enable();
}

static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
{
list_del(&q->list);
if (q->nsops == 1)
list_del(&q->simple_list);
else
sma->complex_count--;
}

/** check_restart(sma, q)
* @sma: semaphore array
* @q: the operation that just completed
*
* update_queue is O(N^2) when it restarts scanning the whole queue of
* waiting operations. Therefore this function checks if the restart is
* really necessary. It is called after a previously waiting operation
* was completed.
*/
static int check_restart(struct sem_array *sma, struct sem_queue *q)
{
struct sem *curr;
struct sem_queue *h;

/* if the operation didn't modify the array, then no restart */
if (q->alter == 0)
return 0;

/* pending complex operations are too difficult to analyse */
if (sma->complex_count)
return 1;

/* we were a sleeping complex operation. Too difficult */
if (q->nsops > 1)
return 1;

curr = sma->sem_base + q->sops[0].sem_num;

/* No-one waits on this queue */
if (list_empty(&curr->sem_pending))
return 0;

/* the new semaphore value */
if (curr->semval) {
/* It is impossible that someone waits for the new value:
* - q is a previously sleeping simple operation that
* altered the array. It must be a decrement, because
* simple increments never sleep.
* - The value is not 0, thus wait-for-zero won't proceed.
* - If there are older (higher priority) decrements
* in the queue, then they have observed the original
* semval value and couldn't proceed. The operation
* decremented to value - thus they won't proceed either.
*/
BUG_ON(q->sops[0].sem_op >= 0);
return 0;
}
/*
* semval is 0. Check if there are wait-for-zero semops.
* They must be the first entries in the per-semaphore simple queue
*/
h = list_first_entry(&curr->sem_pending, struct sem_queue, simple_list);
BUG_ON(h->nsops != 1);
BUG_ON(h->sops[0].sem_num != q->sops[0].sem_num);

/* Yes, there is a wait-for-zero semop. Restart */
if (h->sops[0].sem_op == 0)
return 1;

/* Again - no-one is waiting for the new value. */
return 0;
}


/**
* update_queue(sma, semnum): Look for tasks that can be completed.
* @sma: semaphore array.
* @semnum: semaphore that was modified.
* @pt: list head for the tasks that must be woken up.
*
* update_queue must be called after a semaphore in a semaphore array
* was modified. If multiple semaphore were modified, then @semnum
* must be set to -1.
* The tasks that must be woken up are added to @pt. The return code
* is stored in q->pid.
* The function return 1 if at least one semop was completed successfully.
*/
static int update_queue(struct sem_array *sma, int semnum, struct list_head *pt)
{
struct sem_queue *q;
struct list_head *walk;
struct list_head *pending_list;
int offset;
int semop_completed = 0;

/* if there are complex operations around, then knowing the semaphore
* that was modified doesn't help us. Assume that multiple semaphores
* were modified.
*/
if (sma->complex_count)
semnum = -1;

if (semnum == -1) {
pending_list = &sma->sem_pending;
offset = offsetof(struct sem_queue, list);
} else {
pending_list = &sma->sem_base[semnum].sem_pending;
offset = offsetof(struct sem_queue, simple_list);
}

again:
walk = pending_list->next;
while (walk != pending_list) {
int error, restart;

q = (struct sem_queue *)((char *)walk - offset);
walk = walk->next;

/* If we are scanning the single sop, per-semaphore list of
* one semaphore and that semaphore is 0, then it is not
* necessary to scan the "alter" entries: simple increments
* that affect only one entry succeed immediately and cannot
* be in the per semaphore pending queue, and decrements
* cannot be successful if the value is already 0.
*/
if (semnum != -1 && sma->sem_base[semnum].semval == 0 &&
q->alter)
break;

error = try_atomic_semop(sma, q->sops, q->nsops,
q->undo, q->pid);

/* Does q->sleeper still need to sleep? */
if (error > 0)
continue;

unlink_queue(sma, q);

if (error) {
restart = 0;
} else {
semop_completed = 1;
restart = check_restart(sma, q);
}

wake_up_sem_queue_prepare(pt, q, error);
if (restart)
goto again;
}
return semop_completed;
}

/**
* do_smart_update(sma, sops, nsops, otime, pt) - optimized update_queue
* @sma: semaphore array
* @sops: operations that were performed
* @nsops: number of operations
* @otime: force setting otime
* @pt: list head of the tasks that must be woken up.
*
* do_smart_update() does the required called to update_queue, based on the
* actual changes that were performed on the semaphore array.
* Note that the function does not do the actual wake-up: the caller is
* responsible for calling wake_up_sem_queue_do(@pt).
* It is safe to perform this call after dropping all locks.
*/
static void do_smart_update(struct sem_array *sma, struct sembuf *sops, int nsops,
int otime, struct list_head *pt)
{
int i;

if (sma->complex_count || sops == NULL) {
if (update_queue(sma, -1, pt))
otime = 1;
goto done;
}

for (i = 0; i < nsops; i++) {
if (sops[i].sem_op > 0 ||
(sops[i].sem_op < 0 &&
sma->sem_base[sops[i].sem_num].semval == 0))
if (update_queue(sma, sops[i].sem_num, pt))
otime = 1;
}
done:
if (otime)
sma->sem_otime = get_seconds();
}


/* The following counts are associated to each semaphore:
* semncnt number of tasks waiting on semval being nonzero
* semzcnt number of tasks waiting on semval being zero
* This model assumes that a task waits on exactly one semaphore.
* Since semaphore operations are to be performed atomically, tasks actually
* wait on a whole sequence of semaphores simultaneously.
* The counts we return here are a rough approximation, but still
* warrant that semncnt+semzcnt>0 if the task is on the pending queue.
*/
static int count_semncnt (struct sem_array * sma, ushort semnum)
{
int semncnt;
struct sem_queue * q;

semncnt = 0;
list_for_each_entry(q, &sma->sem_pending, list) {
struct sembuf * sops = q->sops;
int nsops = q->nsops;
int i;
for (i = 0; i < nsops; i++)
if (sops[i].sem_num == semnum
&& (sops[i].sem_op < 0)
&& !(sops[i].sem_flg & IPC_NOWAIT))
semncnt++;
}
return semncnt;
}

static int count_semzcnt (struct sem_array * sma, ushort semnum)
{
int semzcnt;
struct sem_queue * q;

semzcnt = 0;
list_for_each_entry(q, &sma->sem_pending, list) {
struct sembuf * sops = q->sops;
int nsops = q->nsops;
int i;
for (i = 0; i < nsops; i++)
if (sops[i].sem_num == semnum
&& (sops[i].sem_op == 0)
&& !(sops[i].sem_flg & IPC_NOWAIT))
semzcnt++;
}
return semzcnt;
}

/* Free a semaphore set. freeary() is called with sem_ids.rw_mutex locked
* as a writer and the spinlock for this semaphore set hold. sem_ids.rw_mutex
* remains locked on exit.
*/
static void freeary(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
struct sem_undo *un, *tu;
struct sem_queue *q, *tq;
struct sem_array *sma = container_of(ipcp, struct sem_array, sem_perm);
struct list_head tasks;

/* Free the existing undo structures for this semaphore set. */
assert_spin_locked(&sma->sem_perm.lock);
list_for_each_entry_safe(un, tu, &sma->list_id, list_id) {
list_del(&un->list_id);
spin_lock(&un->ulp->lock);
un->semid = -1;
list_del_rcu(&un->list_proc);
spin_unlock(&un->ulp->lock);
kfree_rcu(un, rcu);
}

/* Wake up all pending processes and let them fail with EIDRM. */
INIT_LIST_HEAD(&tasks);
list_for_each_entry_safe(q, tq, &sma->sem_pending, list) {
unlink_queue(sma, q);
wake_up_sem_queue_prepare(&tasks, q, -EIDRM);
}

/* Remove the semaphore set from the IDR */
sem_rmid(ns, sma);
sem_unlock(sma);

wake_up_sem_queue_do(&tasks);
ns->used_sems -= sma->sem_nsems;
security_sem_free(sma);
ipc_rcu_putref(sma);
}

static unsigned long copy_semid_to_user(void __user *buf, struct semid64_ds *in, int version)
{
switch(version) {
case IPC_64:
return copy_to_user(buf, in, sizeof(*in));
case IPC_OLD:
{
struct semid_ds out;

memset(&out, 0, sizeof(out));

ipc64_perm_to_ipc_perm(&in->sem_perm, &out.sem_perm);

out.sem_otime = in->sem_otime;
out.sem_ctime = in->sem_ctime;
out.sem_nsems = in->sem_nsems;

return copy_to_user(buf, &out, sizeof(out));
}
default:
return -EINVAL;
}
}

static int semctl_nolock(struct ipc_namespace *ns, int semid,
int cmd, int version, union semun arg)
{
int err;
struct sem_array *sma;

switch(cmd) {
case IPC_INFO:
case SEM_INFO:
{
struct seminfo seminfo;
int max_id;

err = security_sem_semctl(NULL, cmd);
if (err)
return err;

memset(&seminfo,0,sizeof(seminfo));
seminfo.semmni = ns->sc_semmni;
seminfo.semmns = ns->sc_semmns;
seminfo.semmsl = ns->sc_semmsl;
seminfo.semopm = ns->sc_semopm;
seminfo.semvmx = SEMVMX;
seminfo.semmnu = SEMMNU;
seminfo.semmap = SEMMAP;
seminfo.semume = SEMUME;
down_read(&sem_ids(ns).rw_mutex);
if (cmd == SEM_INFO) {
seminfo.semusz = sem_ids(ns).in_use;
seminfo.semaem = ns->used_sems;
} else {
seminfo.semusz = SEMUSZ;
seminfo.semaem = SEMAEM;
}
max_id = ipc_get_maxid(&sem_ids(ns));
up_read(&sem_ids(ns).rw_mutex);
if (copy_to_user (arg.__buf, &seminfo, sizeof(struct seminfo)))
return -EFAULT;
return (max_id < 0) ? 0: max_id;
}
case IPC_STAT:
case SEM_STAT:
{
struct semid64_ds tbuf;
int id;

if (cmd == SEM_STAT) {
sma = sem_lock(ns, semid);
if (IS_ERR(sma))
return PTR_ERR(sma);
id = sma->sem_perm.id;
} else {
sma = sem_lock_check(ns, semid);
if (IS_ERR(sma))
return PTR_ERR(sma);
id = 0;
}

err = -EACCES;
if (ipcperms(ns, &sma->sem_perm, S_IRUGO))
goto out_unlock;

err = security_sem_semctl(sma, cmd);
if (err)
goto out_unlock;

memset(&tbuf, 0, sizeof(tbuf));

kernel_to_ipc64_perm(&sma->sem_perm, &tbuf.sem_perm);
tbuf.sem_otime = sma->sem_otime;
tbuf.sem_ctime = sma->sem_ctime;
tbuf.sem_nsems = sma->sem_nsems;
sem_unlock(sma);
if (copy_semid_to_user (arg.buf, &tbuf, version))
return -EFAULT;
return id;
}
default:
return -EINVAL;
}
out_unlock:
sem_unlock(sma);
return err;
}

static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
int cmd, int version, union semun arg)
{
struct sem_array *sma;
struct sem* curr;
int err;
ushort fast_sem_io[SEMMSL_FAST];
ushort* sem_io = fast_sem_io;
int nsems;
struct list_head tasks;

sma = sem_lock_check(ns, semid);
if (IS_ERR(sma))
return PTR_ERR(sma);

INIT_LIST_HEAD(&tasks);
nsems = sma->sem_nsems;

err = -EACCES;
if (ipcperms(ns, &sma->sem_perm,
(cmd == SETVAL || cmd == SETALL) ? S_IWUGO : S_IRUGO))
goto out_unlock;

err = security_sem_semctl(sma, cmd);
if (err)
goto out_unlock;

err = -EACCES;
switch (cmd) {
case GETALL:
{
ushort __user *array = arg.array;
int i;

if(nsems > SEMMSL_FAST) {
sem_getref_and_unlock(sma);

sem_io = ipc_alloc(sizeof(ushort)*nsems);
if(sem_io == NULL) {
sem_putref(sma);
return -ENOMEM;
}

sem_lock_and_putref(sma);
if (sma->sem_perm.deleted) {
sem_unlock(sma);
err = -EIDRM;
goto out_free;
}
}

for (i = 0; i < sma->sem_nsems; i++)
sem_io[i] = sma->sem_base[i].semval;
sem_unlock(sma);
err = 0;
if(copy_to_user(array, sem_io, nsems*sizeof(ushort)))
err = -EFAULT;
goto out_free;
}
case SETALL:
{
int i;
struct sem_undo *un;

sem_getref_and_unlock(sma);

if(nsems > SEMMSL_FAST) {
sem_io = ipc_alloc(sizeof(ushort)*nsems);
if(sem_io == NULL) {
sem_putref(sma);
return -ENOMEM;
}
}

if (copy_from_user (sem_io, arg.array, nsems*sizeof(ushort))) {
sem_putref(sma);
err = -EFAULT;
goto out_free;
}

for (i = 0; i < nsems; i++) {
if (sem_io[i] > SEMVMX) {
sem_putref(sma);
err = -ERANGE;
goto out_free;
}
}
sem_lock_and_putref(sma);
if (sma->sem_perm.deleted) {
sem_unlock(sma);
err = -EIDRM;
goto out_free;
}

for (i = 0; i < nsems; i++)
sma->sem_base[i].semval = sem_io[i];

assert_spin_locked(&sma->sem_perm.lock);
list_for_each_entry(un, &sma->list_id, list_id) {
for (i = 0; i < nsems; i++)
un->semadj[i] = 0;
}
sma->sem_ctime = get_seconds();
/* maybe some queued-up processes were waiting for this */
do_smart_update(sma, NULL, 0, 0, &tasks);
err = 0;
goto out_unlock;
}
/* GETVAL, GETPID, GETNCTN, GETZCNT, SETVAL: fall-through */
}
err = -EINVAL;
if(semnum < 0 || semnum >= nsems)
goto out_unlock;

curr = &sma->sem_base[semnum];

switch (cmd) {
case GETVAL:
err = curr->semval;
goto out_unlock;
case GETPID:
err = curr->sempid;
goto out_unlock;
case GETNCNT:
err = count_semncnt(sma,semnum);
goto out_unlock;
case GETZCNT:
err = count_semzcnt(sma,semnum);
goto out_unlock;
case SETVAL:
{
int val = arg.val;
struct sem_undo *un;

err = -ERANGE;
if (val > SEMVMX || val < 0)
goto out_unlock;

assert_spin_locked(&sma->sem_perm.lock);
list_for_each_entry(un, &sma->list_id, list_id)
un->semadj[semnum] = 0;

curr->semval = val;
curr->sempid = task_tgid_vnr(current);
sma->sem_ctime = get_seconds();
/* maybe some queued-up processes were waiting for this */
do_smart_update(sma, NULL, 0, 0, &tasks);
err = 0;
goto out_unlock;
}
}
out_unlock:
sem_unlock(sma);
wake_up_sem_queue_do(&tasks);

out_free:
if(sem_io != fast_sem_io)
ipc_free(sem_io, sizeof(ushort)*nsems);
return err;
}

static inline unsigned long
copy_semid_from_user(struct semid64_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 semid_ds tbuf_old;

if(copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
return -EFAULT;

out->sem_perm.uid = tbuf_old.sem_perm.uid;
out->sem_perm.gid = tbuf_old.sem_perm.gid;
out->sem_perm.mode = tbuf_old.sem_perm.mode;

return 0;
}
default:
return -EINVAL;
}
}

/*
* This function handles some semctl 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 semctl_down(struct ipc_namespace *ns, int semid,
int cmd, int version, union semun arg)
{
struct sem_array *sma;
int err;
struct semid64_ds semid64;
struct kern_ipc_perm *ipcp;

if(cmd == IPC_SET) {
if (copy_semid_from_user(&semid64, arg.buf, version))
return -EFAULT;
}

ipcp = ipcctl_pre_down(ns, &sem_ids(ns), semid, cmd,
&semid64.sem_perm, 0);
if (IS_ERR(ipcp))
return PTR_ERR(ipcp);

sma = container_of(ipcp, struct sem_array, sem_perm);

err = security_sem_semctl(sma, cmd);
if (err)
goto out_unlock;

switch(cmd){
case IPC_RMID:
freeary(ns, ipcp);
goto out_up;
case IPC_SET:
ipc_update_perm(&semid64.sem_perm, ipcp);
sma->sem_ctime = get_seconds();
break;
default:
err = -EINVAL;
}

out_unlock:
sem_unlock(sma);
out_up:
up_write(&sem_ids(ns).rw_mutex);
return err;
}

SYSCALL_DEFINE(semctl)(int semid, int semnum, int cmd, union semun arg)
{
int err = -EINVAL;
int version;
struct ipc_namespace *ns;

if (semid < 0)
return -EINVAL;

version = ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;

switch(cmd) {
case IPC_INFO:
case SEM_INFO:
case IPC_STAT:
case SEM_STAT:
err = semctl_nolock(ns, semid, cmd, version, arg);
return err;
case GETALL:
case GETVAL:
case GETPID:
case GETNCNT:
case GETZCNT:
case SETVAL:
case SETALL:
err = semctl_main(ns,semid,semnum,cmd,version,arg);
return err;
case IPC_RMID:
case IPC_SET:
err = semctl_down(ns, semid, cmd, version, arg);
return err;
default:
return -EINVAL;
}
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_semctl(int semid, int semnum, int cmd, union semun arg)
{
return SYSC_semctl((int) semid, (int) semnum, (int) cmd, arg);
}
SYSCALL_ALIAS(sys_semctl, SyS_semctl);
#endif

/* If the task doesn't already have a undo_list, then allocate one
* here. We guarantee there is only one thread using this undo list,
* and current is THE ONE
*
* If this allocation and assignment succeeds, but later
* portions of this code fail, there is no need to free the sem_undo_list.
* Just let it stay associated with the task, and it'll be freed later
* at exit time.
*
* This can block, so callers must hold no locks.
*/
static inline int get_undo_list(struct sem_undo_list **undo_listp)
{
struct sem_undo_list *undo_list;

undo_list = current->sysvsem.undo_list;
if (!undo_list) {
undo_list = kzalloc(sizeof(*undo_list), GFP_KERNEL);
if (undo_list == NULL)
return -ENOMEM;
spin_lock_init(&undo_list->lock);
atomic_set(&undo_list->refcnt, 1);
INIT_LIST_HEAD(&undo_list->list_proc);

current->sysvsem.undo_list = undo_list;
}
*undo_listp = undo_list;
return 0;
}

static struct sem_undo *__lookup_undo(struct sem_undo_list *ulp, int semid)
{
struct sem_undo *un;

list_for_each_entry_rcu(un, &ulp->list_proc, list_proc) {
if (un->semid == semid)
return un;
}
return NULL;
}

static struct sem_undo *lookup_undo(struct sem_undo_list *ulp, int semid)
{
struct sem_undo *un;

   assert_spin_locked(&ulp->lock);

un = __lookup_undo(ulp, semid);
if (un) {
list_del_rcu(&un->list_proc);
list_add_rcu(&un->list_proc, &ulp->list_proc);
}
return un;
}

/**
* find_alloc_undo - Lookup (and if not present create) undo array
* @ns: namespace
* @semid: semaphore array id
*
* The function looks up (and if not present creates) the undo structure.
* The size of the undo structure depends on the size of the semaphore
* array, thus the alloc path is not that straightforward.
* Lifetime-rules: sem_undo is rcu-protected, on success, the function
* performs a rcu_read_lock().
*/
static struct sem_undo *find_alloc_undo(struct ipc_namespace *ns, int semid)
{
struct sem_array *sma;
struct sem_undo_list *ulp;
struct sem_undo *un, *new;
int nsems;
int error;

error = get_undo_list(&ulp);
if (error)
return ERR_PTR(error);

rcu_read_lock();
spin_lock(&ulp->lock);
un = lookup_undo(ulp, semid);
spin_unlock(&ulp->lock);
if (likely(un!=NULL))
goto out;
rcu_read_unlock();

/* no undo structure around - allocate one. */
/* step 1: figure out the size of the semaphore array */
sma = sem_lock_check(ns, semid);
if (IS_ERR(sma))
return ERR_CAST(sma);

nsems = sma->sem_nsems;
sem_getref_and_unlock(sma);

/* step 2: allocate new undo structure */
new = kzalloc(sizeof(struct sem_undo) + sizeof(short)*nsems, GFP_KERNEL);
if (!new) {
sem_putref(sma);
return ERR_PTR(-ENOMEM);
}

/* step 3: Acquire the lock on semaphore array */
sem_lock_and_putref(sma);
if (sma->sem_perm.deleted) {
sem_unlock(sma);
kfree(new);
un = ERR_PTR(-EIDRM);
goto out;
}
spin_lock(&ulp->lock);

/*
* step 4: check for races: did someone else allocate the undo struct?
*/
un = lookup_undo(ulp, semid);
if (un) {
kfree(new);
goto success;
}
/* step 5: initialize & link new undo structure */
new->semadj = (short *) &new[1];
new->ulp = ulp;
new->semid = semid;
assert_spin_locked(&ulp->lock);
list_add_rcu(&new->list_proc, &ulp->list_proc);
assert_spin_locked(&sma->sem_perm.lock);
list_add(&new->list_id, &sma->list_id);
un = new;

success:
spin_unlock(&ulp->lock);
rcu_read_lock();
sem_unlock(sma);
out:
return un;
}


/**
* get_queue_result - Retrieve the result code from sem_queue
* @q: Pointer to queue structure
*
* Retrieve the return code from the pending queue. If IN_WAKEUP is found in
* q->status, then we must loop until the value is replaced with the final
* value: This may happen if a task is woken up by an unrelated event (e.g.
* signal) and in parallel the task is woken up by another task because it got
* the requested semaphores.
*
* The function can be called with or without holding the semaphore spinlock.
*/
static int get_queue_result(struct sem_queue *q)
{
int error;

error = q->status;
while (unlikely(error == IN_WAKEUP)) {
cpu_relax();
error = q->status;
}

return error;
}


SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops, const struct timespec __user *, timeout)
{
int error = -EINVAL;
struct sem_array *sma;
struct sembuf fast_sops[SEMOPM_FAST];
struct sembuf* sops = fast_sops, *sop;
struct sem_undo *un;
int undos = 0, alter = 0, max;
struct sem_queue queue;
unsigned long jiffies_left = 0;
struct ipc_namespace *ns;
struct list_head tasks;

ns = current->nsproxy->ipc_ns;

if (nsops < 1 || semid < 0)
return -EINVAL;
if (nsops > ns->sc_semopm)
return -E2BIG;
if(nsops > SEMOPM_FAST) {
sops = kmalloc(sizeof(*sops)*nsops,GFP_KERNEL);
if(sops==NULL)
return -ENOMEM;
}
if (copy_from_user (sops, tsops, nsops * sizeof(*tsops))) {
error=-EFAULT;
goto out_free;
}
if (timeout) {
struct timespec _timeout;
if (copy_from_user(&_timeout, timeout, sizeof(*timeout))) {
error = -EFAULT;
goto out_free;
}
if (_timeout.tv_sec < 0 || _timeout.tv_nsec < 0 ||
_timeout.tv_nsec >= 1000000000L) {
error = -EINVAL;
goto out_free;
}
jiffies_left = timespec_to_jiffies(&_timeout);
}
max = 0;
for (sop = sops; sop < sops + nsops; sop++) {
if (sop->sem_num >= max)
max = sop->sem_num;
if (sop->sem_flg & SEM_UNDO)
undos = 1;
if (sop->sem_op != 0)
alter = 1;
}

if (undos) {
un = find_alloc_undo(ns, semid);
if (IS_ERR(un)) {
error = PTR_ERR(un);
goto out_free;
}
} else
un = NULL;

INIT_LIST_HEAD(&tasks);

sma = sem_lock_check(ns, semid);
if (IS_ERR(sma)) {
if (un)
rcu_read_unlock();
error = PTR_ERR(sma);
goto out_free;
}

/*
* semid identifiers are not unique - find_alloc_undo may have
* allocated an undo structure, it was invalidated by an RMID
* and now a new array with received the same id. Check and fail.
* This case can be detected checking un->semid. The existence of
* "un" itself is guaranteed by rcu.
*/
error = -EIDRM;
if (un) {
if (un->semid == -1) {
rcu_read_unlock();
goto out_unlock_free;
} else {
/*
* rcu lock can be released, "un" cannot disappear:
* - sem_lock is acquired, thus IPC_RMID is
* impossible.
* - exit_sem is impossible, it always operates on
* current (or a dead task).
*/

rcu_read_unlock();
}
}

error = -EFBIG;
if (max >= sma->sem_nsems)
goto out_unlock_free;

error = -EACCES;
if (ipcperms(ns, &sma->sem_perm, alter ? S_IWUGO : S_IRUGO))
goto out_unlock_free;

error = security_sem_semop(sma, sops, nsops, alter);
if (error)
goto out_unlock_free;

error = try_atomic_semop (sma, sops, nsops, un, task_tgid_vnr(current));
if (error <= 0) {
if (alter && error == 0)
do_smart_update(sma, sops, nsops, 1, &tasks);

goto out_unlock_free;
}

/* We need to sleep on this operation, so we put the current
* task into the pending queue and go to sleep.
*/

queue.sops = sops;
queue.nsops = nsops;
queue.undo = un;
queue.pid = task_tgid_vnr(current);
queue.alter = alter;
if (alter)
list_add_tail(&queue.list, &sma->sem_pending);
else
list_add(&queue.list, &sma->sem_pending);

if (nsops == 1) {
struct sem *curr;
curr = &sma->sem_base[sops->sem_num];

if (alter)
list_add_tail(&queue.simple_list, &curr->sem_pending);
else
list_add(&queue.simple_list, &curr->sem_pending);
} else {
INIT_LIST_HEAD(&queue.simple_list);
sma->complex_count++;
}

queue.status = -EINTR;
queue.sleeper = current;

sleep_again:
current->state = TASK_INTERRUPTIBLE;
sem_unlock(sma);

if (timeout)
jiffies_left = schedule_timeout(jiffies_left);
else
schedule();

error = get_queue_result(&queue);

if (error != -EINTR) {
/* fast path: update_queue already obtained all requested
* resources.
* Perform a smp_mb(): User space could assume that semop()
* is a memory barrier: Without the mb(), the cpu could
* speculatively read in user space stale data that was
* overwritten by the previous owner of the semaphore.
*/
smp_mb();

goto out_free;
}

sma = sem_lock(ns, semid);

/*
* Wait until it's guaranteed that no wakeup_sem_queue_do() is ongoing.
*/
error = get_queue_result(&queue);

/*
* Array removed? If yes, leave without sem_unlock().
*/
if (IS_ERR(sma)) {
goto out_free;
}


/*
* If queue.status != -EINTR we are woken up by another process.
* Leave without unlink_queue(), but with sem_unlock().
*/

if (error != -EINTR) {
goto out_unlock_free;
}

/*
* If an interrupt occurred we have to clean up the queue
*/
if (timeout && jiffies_left == 0)
error = -EAGAIN;

/*
* If the wakeup was spurious, just retry
*/
if (error == -EINTR && !signal_pending(current))
goto sleep_again;

unlink_queue(sma, &queue);

out_unlock_free:
sem_unlock(sma);

wake_up_sem_queue_do(&tasks);
out_free:
if(sops != fast_sops)
kfree(sops);
return error;
}

SYSCALL_DEFINE3(semop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops)
{
return sys_semtimedop(semid, tsops, nsops, NULL);
}

/* If CLONE_SYSVSEM is set, establish sharing of SEM_UNDO state between
* parent and child tasks.
*/

int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
{
struct sem_undo_list *undo_list;
int error;

if (clone_flags & CLONE_SYSVSEM) {
error = get_undo_list(&undo_list);
if (error)
return error;
atomic_inc(&undo_list->refcnt);
tsk->sysvsem.undo_list = undo_list;
} else
tsk->sysvsem.undo_list = NULL;

return 0;
}

/*
* add semadj values to semaphores, free undo structures.
* undo structures are not freed when semaphore arrays are destroyed
* so some of them may be out of date.
* IMPLEMENTATION NOTE: There is some confusion over whether the
* set of adjustments that needs to be done should be done in an atomic
* manner or not. That is, if we are attempting to decrement the semval
* should we queue up and wait until we can do so legally?
* The original implementation attempted to do this (queue and wait).
* The current implementation does not do so. The POSIX standard
* and SVID should be consulted to determine what behavior is mandated.
*/
void exit_sem(struct task_struct *tsk)
{
struct sem_undo_list *ulp;

ulp = tsk->sysvsem.undo_list;
if (!ulp)
return;
tsk->sysvsem.undo_list = NULL;

if (!atomic_dec_and_test(&ulp->refcnt))
return;

for (;;) {
struct sem_array *sma;
struct sem_undo *un;
struct list_head tasks;
int semid;
int i;

rcu_read_lock();
un = list_entry_rcu(ulp->list_proc.next,
struct sem_undo, list_proc);
if (&un->list_proc == &ulp->list_proc)
semid = -1;
else
semid = un->semid;
rcu_read_unlock();

if (semid == -1)
break;

sma = sem_lock_check(tsk->nsproxy->ipc_ns, un->semid);

/* exit_sem raced with IPC_RMID, nothing to do */
if (IS_ERR(sma))
continue;

un = __lookup_undo(ulp, semid);
if (un == NULL) {
/* exit_sem raced with IPC_RMID+semget() that created
* exactly the same semid. Nothing to do.
*/
sem_unlock(sma);
continue;
}

/* remove un from the linked lists */
assert_spin_locked(&sma->sem_perm.lock);
list_del(&un->list_id);

spin_lock(&ulp->lock);
list_del_rcu(&un->list_proc);
spin_unlock(&ulp->lock);

/* perform adjustments registered in un */
for (i = 0; i < sma->sem_nsems; i++) {
struct sem * semaphore = &sma->sem_base[i];
if (un->semadj[i]) {
semaphore->semval += un->semadj[i];
/*
* Range checks of the new semaphore value,
* not defined by sus:
* - Some unices ignore the undo entirely
* (e.g. HP UX 11i 11.22, Tru64 V5.1)
* - some cap the value (e.g. FreeBSD caps
* at 0, but doesn't enforce SEMVMX)
*
* Linux caps the semaphore value, both at 0
* and at SEMVMX.
*
* Manfred <manfred@colorfullife.com>
*/
if (semaphore->semval < 0)
semaphore->semval = 0;
if (semaphore->semval > SEMVMX)
semaphore->semval = SEMVMX;
semaphore->sempid = task_tgid_vnr(current);
}
}
/* maybe some queued-up processes were waiting for this */
INIT_LIST_HEAD(&tasks);
do_smart_update(sma, NULL, 0, 1, &tasks);
sem_unlock(sma);
wake_up_sem_queue_do(&tasks);

kfree_rcu(un, rcu);
}
kfree(ulp);
}

#ifdef CONFIG_PROC_FS
static int sysvipc_sem_proc_show(struct seq_file *s, void *it)
{
struct sem_array *sma = it;

return seq_printf(s,
"%10d %10d %4o %10u %5u %5u %5u %5u %10lu %10lu\n",
sma->sem_perm.key,
sma->sem_perm.id,
sma->sem_perm.mode,
sma->sem_nsems,
sma->sem_perm.uid,
sma->sem_perm.gid,
sma->sem_perm.cuid,
sma->sem_perm.cgid,
sma->sem_otime,
sma->sem_ctime);
}
#endif
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