[PATCH 4/6] IPC namespace - sem
From: Kirill Korotaev
Date: Fri Jun 09 2006 - 11:09:16 EST
IPC namespace support for IPC sem code.
Signed-Off-By: Pavel Emelianiov <xemul@xxxxxxxxxx>
Signed-Off-By: Kirill Korotaev <dev@xxxxxxxxxx>
--- ./ipc/sem.c.ipcns 2006-06-06 14:47:58.000000000 +0400
+++ ./ipc/sem.c 2006-06-09 14:20:06.000000000 +0400
@@ -64,6 +64,10 @@
*
* support for audit of ipc object properties and permission changes
* Dustin Kirkland <dustin.kirkland@xxxxxxxxxx>
+ *
+ * namespaces support
+ * OpenVZ, SWsoft Inc.
+ * Pavel Emelianov <xemul@xxxxxxxxxx>
*/
#include <linux/config.h>
@@ -79,22 +83,25 @@
#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
+#include <linux/nsproxy.h>
#include <asm/uaccess.h>
#include "util.h"
+#define sem_ids(ns) (*((ns)->ids[IPC_SEM_IDS]))
-#define sem_lock(id) ((struct sem_array*)ipc_lock(&sem_ids,id))
-#define sem_unlock(sma) ipc_unlock(&(sma)->sem_perm)
-#define sem_rmid(id) ((struct sem_array*)ipc_rmid(&sem_ids,id))
-#define sem_checkid(sma, semid) \
- ipc_checkid(&sem_ids,&sma->sem_perm,semid)
-#define sem_buildid(id, seq) \
- ipc_buildid(&sem_ids, id, seq)
-static struct ipc_ids sem_ids;
+#define sem_lock(ns, id) ((struct sem_array*)ipc_lock(&sem_ids(ns), id))
+#define sem_unlock(sma) ipc_unlock(&(sma)->sem_perm)
+#define sem_rmid(ns, id) ((struct sem_array*)ipc_rmid(&sem_ids(ns), id))
+#define sem_checkid(ns, sma, semid) \
+ ipc_checkid(&sem_ids(ns),&sma->sem_perm,semid)
+#define sem_buildid(ns, id, seq) \
+ ipc_buildid(&sem_ids(ns), id, seq)
-static int newary (key_t, int, int);
-static void freeary (struct sem_array *sma, int id);
+static struct ipc_ids init_sem_ids;
+
+static int newary (struct ipc_namespace *, key_t, int, int);
+static void freeary (struct ipc_namespace *ns, struct sem_array *sma, int id);
#ifdef CONFIG_PROC_FS
static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
#endif
@@ -111,22 +118,61 @@ static int sysvipc_sem_proc_show(struct
*
*/
-int sem_ctls[4] = {SEMMSL, SEMMNS, SEMOPM, SEMMNI};
-#define sc_semmsl (sem_ctls[0])
-#define sc_semmns (sem_ctls[1])
-#define sc_semopm (sem_ctls[2])
-#define sc_semmni (sem_ctls[3])
+#define sc_semmsl sem_ctls[0]
+#define sc_semmns sem_ctls[1]
+#define sc_semopm sem_ctls[2]
+#define sc_semmni sem_ctls[3]
-static int used_sems;
+static void __ipc_init __sem_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+{
+ ns->ids[IPC_SEM_IDS] = ids;
+ ns->sc_semmsl = SEMMSL;
+ ns->sc_semmns = SEMMNS;
+ ns->sc_semopm = SEMOPM;
+ ns->sc_semmni = SEMMNI;
+ ns->used_sems = 0;
+ ipc_init_ids(ids, ns->sc_semmni);
+}
+
+#ifdef CONFIG_IPC_NS
+int sem_init_ns(struct ipc_namespace *ns)
+{
+ struct ipc_ids *ids;
+
+ ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
+ if (ids == NULL)
+ return -ENOMEM;
+
+ __sem_init_ns(ns, ids);
+ return 0;
+}
+
+void sem_exit_ns(struct ipc_namespace *ns)
+{
+ int i;
+ struct sem_array *sma;
+
+ mutex_lock(&sem_ids(ns).mutex);
+ for (i = 0; i <= sem_ids(ns).max_id; i++) {
+ sma = sem_lock(ns, i);
+ if (sma == NULL)
+ continue;
+
+ freeary(ns, sma, i);
+ }
+ mutex_unlock(&sem_ids(ns).mutex);
+
+ kfree(ns->ids[IPC_SEM_IDS]);
+ ns->ids[IPC_SEM_IDS] = NULL;
+}
+#endif
void __init sem_init (void)
{
- used_sems = 0;
- ipc_init_ids(&sem_ids,sc_semmni);
+ __sem_init_ns(&init_ipc_ns, &init_sem_ids);
ipc_init_proc_interface("sysvipc/sem",
" key semid perms nsems uid gid cuid cgid otime ctime\n",
- &sem_ids,
- sysvipc_sem_proc_show);
+ IPC_SEM_IDS, sysvipc_sem_proc_show);
}
/*
@@ -163,7 +209,7 @@ void __init sem_init (void)
*/
#define IN_WAKEUP 1
-static int newary (key_t key, int nsems, int semflg)
+static int newary (struct ipc_namespace *ns, key_t key, int nsems, int semflg)
{
int id;
int retval;
@@ -172,7 +218,7 @@ static int newary (key_t key, int nsems,
if (!nsems)
return -EINVAL;
- if (used_sems + nsems > sc_semmns)
+ if (ns->used_sems + nsems > ns->sc_semmns)
return -ENOSPC;
size = sizeof (*sma) + nsems * sizeof (struct sem);
@@ -192,15 +238,15 @@ static int newary (key_t key, int nsems,
return retval;
}
- id = ipc_addid(&sem_ids, &sma->sem_perm, sc_semmni);
+ id = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni);
if(id == -1) {
security_sem_free(sma);
ipc_rcu_putref(sma);
return -ENOSPC;
}
- used_sems += nsems;
+ ns->used_sems += nsems;
- sma->sem_id = sem_buildid(id, sma->sem_perm.seq);
+ sma->sem_id = sem_buildid(ns, id, sma->sem_perm.seq);
sma->sem_base = (struct sem *) &sma[1];
/* sma->sem_pending = NULL; */
sma->sem_pending_last = &sma->sem_pending;
@@ -216,29 +262,32 @@ asmlinkage long sys_semget (key_t key, i
{
int id, err = -EINVAL;
struct sem_array *sma;
+ struct ipc_namespace *ns;
- if (nsems < 0 || nsems > sc_semmsl)
+ ns = current->nsproxy->ipc_ns;
+
+ if (nsems < 0 || nsems > ns->sc_semmsl)
return -EINVAL;
- mutex_lock(&sem_ids.mutex);
+ mutex_lock(&sem_ids(ns).mutex);
if (key == IPC_PRIVATE) {
- err = newary(key, nsems, semflg);
- } else if ((id = ipc_findkey(&sem_ids, key)) == -1) { /* key not used */
+ err = newary(ns, key, nsems, semflg);
+ } else if ((id = ipc_findkey(&sem_ids(ns), key)) == -1) { /* key not used */
if (!(semflg & IPC_CREAT))
err = -ENOENT;
else
- err = newary(key, nsems, semflg);
+ err = newary(ns, key, nsems, semflg);
} else if (semflg & IPC_CREAT && semflg & IPC_EXCL) {
err = -EEXIST;
} else {
- sma = sem_lock(id);
+ sma = sem_lock(ns, id);
BUG_ON(sma==NULL);
if (nsems > sma->sem_nsems)
err = -EINVAL;
else if (ipcperms(&sma->sem_perm, semflg))
err = -EACCES;
else {
- int semid = sem_buildid(id, sma->sem_perm.seq);
+ int semid = sem_buildid(ns, id, sma->sem_perm.seq);
err = security_sem_associate(sma, semflg);
if (!err)
err = semid;
@@ -246,7 +295,7 @@ asmlinkage long sys_semget (key_t key, i
sem_unlock(sma);
}
- mutex_unlock(&sem_ids.mutex);
+ mutex_unlock(&sem_ids(ns).mutex);
return err;
}
@@ -445,7 +494,7 @@ static int count_semzcnt (struct sem_arr
* the spinlock for this semaphore set hold. sem_ids.mutex remains locked
* on exit.
*/
-static void freeary (struct sem_array *sma, int id)
+static void freeary (struct ipc_namespace *ns, struct sem_array *sma, int id)
{
struct sem_undo *un;
struct sem_queue *q;
@@ -473,10 +522,10 @@ static void freeary (struct sem_array *s
}
/* Remove the semaphore set from the ID array*/
- sma = sem_rmid(id);
+ sma = sem_rmid(ns, id);
sem_unlock(sma);
- used_sems -= sma->sem_nsems;
+ ns->used_sems -= sma->sem_nsems;
size = sizeof (*sma) + sma->sem_nsems * sizeof (struct sem);
security_sem_free(sma);
ipc_rcu_putref(sma);
@@ -504,7 +553,8 @@ static unsigned long copy_semid_to_user(
}
}
-static int semctl_nolock(int semid, int semnum, int cmd, int version, union semun arg)
+static int semctl_nolock(struct ipc_namespace *ns, int semid, int semnum,
+ int cmd, int version, union semun arg)
{
int err = -EINVAL;
struct sem_array *sma;
@@ -521,24 +571,24 @@ static int semctl_nolock(int semid, int
return err;
memset(&seminfo,0,sizeof(seminfo));
- seminfo.semmni = sc_semmni;
- seminfo.semmns = sc_semmns;
- seminfo.semmsl = sc_semmsl;
- seminfo.semopm = sc_semopm;
+ 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;
- mutex_lock(&sem_ids.mutex);
+ mutex_lock(&sem_ids(ns).mutex);
if (cmd == SEM_INFO) {
- seminfo.semusz = sem_ids.in_use;
- seminfo.semaem = used_sems;
+ seminfo.semusz = sem_ids(ns).in_use;
+ seminfo.semaem = ns->used_sems;
} else {
seminfo.semusz = SEMUSZ;
seminfo.semaem = SEMAEM;
}
- max_id = sem_ids.max_id;
- mutex_unlock(&sem_ids.mutex);
+ max_id = sem_ids(ns).max_id;
+ mutex_unlock(&sem_ids(ns).mutex);
if (copy_to_user (arg.__buf, &seminfo, sizeof(struct seminfo)))
return -EFAULT;
return (max_id < 0) ? 0: max_id;
@@ -548,12 +598,12 @@ static int semctl_nolock(int semid, int
struct semid64_ds tbuf;
int id;
- if(semid >= sem_ids.entries->size)
+ if(semid >= sem_ids(ns).entries->size)
return -EINVAL;
memset(&tbuf,0,sizeof(tbuf));
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
if(sma == NULL)
return -EINVAL;
@@ -565,7 +615,7 @@ static int semctl_nolock(int semid, int
if (err)
goto out_unlock;
- id = sem_buildid(semid, sma->sem_perm.seq);
+ id = sem_buildid(ns, semid, sma->sem_perm.seq);
kernel_to_ipc64_perm(&sma->sem_perm, &tbuf.sem_perm);
tbuf.sem_otime = sma->sem_otime;
@@ -585,7 +635,8 @@ out_unlock:
return err;
}
-static int semctl_main(int semid, int semnum, int cmd, int version, union semun arg)
+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;
@@ -594,14 +645,14 @@ static int semctl_main(int semid, int se
ushort* sem_io = fast_sem_io;
int nsems;
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
if(sma==NULL)
return -EINVAL;
nsems = sma->sem_nsems;
err=-EIDRM;
- if (sem_checkid(sma,semid))
+ if (sem_checkid(ns,sma,semid))
goto out_unlock;
err = -EACCES;
@@ -803,7 +854,8 @@ static inline unsigned long copy_semid_f
}
}
-static int semctl_down(int semid, int semnum, int cmd, int version, union semun arg)
+static int semctl_down(struct ipc_namespace *ns, int semid, int semnum,
+ int cmd, int version, union semun arg)
{
struct sem_array *sma;
int err;
@@ -814,11 +866,11 @@ static int semctl_down(int semid, int se
if(copy_semid_from_user (&setbuf, arg.buf, version))
return -EFAULT;
}
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
if(sma==NULL)
return -EINVAL;
- if (sem_checkid(sma,semid)) {
+ if (sem_checkid(ns,sma,semid)) {
err=-EIDRM;
goto out_unlock;
}
@@ -845,7 +897,7 @@ static int semctl_down(int semid, int se
switch(cmd){
case IPC_RMID:
- freeary(sma, semid);
+ freeary(ns, sma, semid);
err = 0;
break;
case IPC_SET:
@@ -873,17 +925,19 @@ asmlinkage long sys_semctl (int semid, i
{
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 SEM_STAT:
- err = semctl_nolock(semid,semnum,cmd,version,arg);
+ err = semctl_nolock(ns,semid,semnum,cmd,version,arg);
return err;
case GETALL:
case GETVAL:
@@ -893,13 +947,13 @@ asmlinkage long sys_semctl (int semid, i
case IPC_STAT:
case SETVAL:
case SETALL:
- err = semctl_main(semid,semnum,cmd,version,arg);
+ err = semctl_main(ns,semid,semnum,cmd,version,arg);
return err;
case IPC_RMID:
case IPC_SET:
- mutex_lock(&sem_ids.mutex);
- err = semctl_down(semid,semnum,cmd,version,arg);
- mutex_unlock(&sem_ids.mutex);
+ mutex_lock(&sem_ids(ns).mutex);
+ err = semctl_down(ns,semid,semnum,cmd,version,arg);
+ mutex_unlock(&sem_ids(ns).mutex);
return err;
default:
return -EINVAL;
@@ -987,7 +1041,7 @@ static struct sem_undo *lookup_undo(stru
return un;
}
-static struct sem_undo *find_undo(int semid)
+static struct sem_undo *find_undo(struct ipc_namespace *ns, int semid)
{
struct sem_array *sma;
struct sem_undo_list *ulp;
@@ -1006,12 +1060,12 @@ static struct sem_undo *find_undo(int se
goto out;
/* no undo structure around - allocate one. */
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
un = ERR_PTR(-EINVAL);
if(sma==NULL)
goto out;
un = ERR_PTR(-EIDRM);
- if (sem_checkid(sma,semid)) {
+ if (sem_checkid(ns,sma,semid)) {
sem_unlock(sma);
goto out;
}
@@ -1071,10 +1125,13 @@ asmlinkage long sys_semtimedop(int semid
int undos = 0, alter = 0, max;
struct sem_queue queue;
unsigned long jiffies_left = 0;
+ struct ipc_namespace *ns;
+
+ ns = current->nsproxy->ipc_ns;
if (nsops < 1 || semid < 0)
return -EINVAL;
- if (nsops > sc_semopm)
+ if (nsops > ns->sc_semopm)
return -E2BIG;
if(nsops > SEMOPM_FAST) {
sops = kmalloc(sizeof(*sops)*nsops,GFP_KERNEL);
@@ -1110,7 +1167,7 @@ asmlinkage long sys_semtimedop(int semid
retry_undos:
if (undos) {
- un = find_undo(semid);
+ un = find_undo(ns, semid);
if (IS_ERR(un)) {
error = PTR_ERR(un);
goto out_free;
@@ -1118,12 +1175,12 @@ retry_undos:
} else
un = NULL;
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
error=-EINVAL;
if(sma==NULL)
goto out_free;
error = -EIDRM;
- if (sem_checkid(sma,semid))
+ if (sem_checkid(ns,sma,semid))
goto out_unlock_free;
/*
* semid identifies are not unique - find_undo may have
@@ -1191,7 +1248,7 @@ retry_undos:
goto out_free;
}
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
if(sma==NULL) {
BUG_ON(queue.prev != NULL);
error = -EIDRM;
@@ -1268,6 +1325,7 @@ void exit_sem(struct task_struct *tsk)
{
struct sem_undo_list *undo_list;
struct sem_undo *u, **up;
+ struct ipc_namespace *ns;
undo_list = tsk->sysvsem.undo_list;
if (!undo_list)
@@ -1276,6 +1334,7 @@ void exit_sem(struct task_struct *tsk)
if (!atomic_dec_and_test(&undo_list->refcnt))
return;
+ ns = tsk->nsproxy->ipc_ns;
/* There's no need to hold the semundo list lock, as current
* is the last task exiting for this undo list.
*/
@@ -1289,14 +1348,14 @@ void exit_sem(struct task_struct *tsk)
if(semid == -1)
continue;
- sma = sem_lock(semid);
+ sma = sem_lock(ns, semid);
if (sma == NULL)
continue;
if (u->semid == -1)
goto next_entry;
- BUG_ON(sem_checkid(sma,u->semid));
+ BUG_ON(sem_checkid(ns,sma,u->semid));
/* remove u from the sma->undo list */
for (unp = &sma->undo; (un = *unp); unp = &un->id_next) {