[PATCH] IPC namespace - shm
IPC namespace support for IPC shm code.
Signed-off-by: Pavel Emelianiov <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/ipc/shm.c b/ipc/shm.c
index 940b0c9..bfbd317 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -15,6 +15,10 @@
*
* 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/slab.h>
@@ -32,6 +36,7 @@
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
+#include <linux/nsproxy.h>
#include <asm/uaccess.h>
@@ -40,59 +45,115 @@
static struct file_operations shm_file_operations;
static struct vm_operations_struct shm_vm_ops;
-static struct ipc_ids shm_ids;
+static struct ipc_ids init_shm_ids;
-#define shm_lock(id) ((struct shmid_kernel*)ipc_lock(&shm_ids,id))
-#define shm_unlock(shp) ipc_unlock(&(shp)->shm_perm)
-#define shm_get(id) ((struct shmid_kernel*)ipc_get(&shm_ids,id))
-#define shm_buildid(id, seq) \
- ipc_buildid(&shm_ids, id, seq)
+#define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS]))
-static int newseg (key_t key, int shmflg, size_t size);
+#define shm_lock(ns, id) \
+ ((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
+#define shm_unlock(shp) \
+ ipc_unlock(&(shp)->shm_perm)
+#define shm_get(ns, id) \
+ ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
+#define shm_buildid(ns, id, seq) \
+ ipc_buildid(&shm_ids(ns), id, seq)
+
+static int newseg (struct ipc_namespace *ns, key_t key,
+ int shmflg, size_t size);
static void shm_open (struct vm_area_struct *shmd);
static void shm_close (struct vm_area_struct *shmd);
+static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
#ifdef CONFIG_PROC_FS
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif
-size_t shm_ctlmax = SHMMAX;
-size_t shm_ctlall = SHMALL;
-int shm_ctlmni = SHMMNI;
+static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+{
+ ns->ids[IPC_SHM_IDS] = ids;
+ ns->shm_ctlmax = SHMMAX;
+ ns->shm_ctlall = SHMALL;
+ ns->shm_ctlmni = SHMMNI;
+ ns->shm_tot = 0;
+ ipc_init_ids(ids, 1);
+}
-static int shm_tot; /* total number of shared memory pages */
+static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
+{
+ if (shp->shm_nattch){
+ shp->shm_perm.mode |= SHM_DEST;
+ /* Do not find it any more */
+ shp->shm_perm.key = IPC_PRIVATE;
+ shm_unlock(shp);
+ } else
+ shm_destroy(ns, shp);
+}
+
+#ifdef CONFIG_IPC_NS
+int shm_init_ns(struct ipc_namespace *ns)
+{
+ struct ipc_ids *ids;
+
+ ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
+ if (ids == NULL)
+ return -ENOMEM;
+
+ __shm_init_ns(ns, ids);
+ return 0;
+}
+
+void shm_exit_ns(struct ipc_namespace *ns)
+{
+ int i;
+ struct shmid_kernel *shp;
+
+ mutex_lock(&shm_ids(ns).mutex);
+ for (i = 0; i <= shm_ids(ns).max_id; i++) {
+ shp = shm_lock(ns, i);
+ if (shp == NULL)
+ continue;
+
+ do_shm_rmid(ns, shp);
+ }
+ mutex_unlock(&shm_ids(ns).mutex);
+
+ kfree(ns->ids[IPC_SHM_IDS]);
+ ns->ids[IPC_SHM_IDS] = NULL;
+}
+#endif
void __init shm_init (void)
{
- ipc_init_ids(&shm_ids, 1);
+ __shm_init_ns(&init_ipc_ns, &init_shm_ids);
ipc_init_proc_interface("sysvipc/shm",
" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n",
- &shm_ids,
- sysvipc_shm_proc_show);
+ IPC_SHM_IDS, sysvipc_shm_proc_show);
}
-static inline int shm_checkid(struct shmid_kernel *s, int id)
+static inline int shm_checkid(struct ipc_namespace *ns,
+ struct shmid_kernel *s, int id)
{
- if (ipc_checkid(&shm_ids,&s->shm_perm,id))
+ if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
return -EIDRM;
return 0;
}
-static inline struct shmid_kernel *shm_rmid(int id)
+static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
{
- return (struct shmid_kernel *)ipc_rmid(&shm_ids,id);
+ return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
}
-static inline int shm_addid(struct shmid_kernel *shp)
+static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
- return ipc_addid(&shm_ids, &shp->shm_perm, shm_ctlmni);
+ return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
}
-static inline void shm_inc (int id) {
+static inline void shm_inc(struct ipc_namespace *ns, int id)
+{
struct shmid_kernel *shp;
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(!shp);
shp->shm_atim = get_seconds();
shp->shm_lprid = current->tgid;
@@ -100,10 +161,13 @@
shm_unlock(shp);
}
+#define shm_file_ns(file) (*((struct ipc_namespace **)&(file)->private_data))
+
/* This is called by fork, once for every shm attach. */
-static void shm_open (struct vm_area_struct *shmd)
+static void shm_open(struct vm_area_struct *shmd)
{
- shm_inc (shmd->vm_file->f_dentry->d_inode->i_ino);
+ shm_inc(shm_file_ns(shmd->vm_file),
+ shmd->vm_file->f_dentry->d_inode->i_ino);
}
/*
@@ -114,10 +178,10 @@
* It has to be called with shp and shm_ids.mutex locked,
* but returns with shp unlocked and freed.
*/
-static void shm_destroy (struct shmid_kernel *shp)
+static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
- shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
- shm_rmid (shp->id);
+ ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ shm_rmid(ns, shp->id);
shm_unlock(shp);
if (!is_file_hugepages(shp->shm_file))
shmem_lock(shp->shm_file, 0, shp->mlock_user);
@@ -140,20 +204,23 @@
struct file * file = shmd->vm_file;
int id = file->f_dentry->d_inode->i_ino;
struct shmid_kernel *shp;
+ struct ipc_namespace *ns;
- mutex_lock(&shm_ids.mutex);
+ ns = shm_file_ns(file);
+
+ mutex_lock(&shm_ids(ns).mutex);
/* remove from the list of attaches of the shm segment */
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(!shp);
shp->shm_lprid = current->tgid;
shp->shm_dtim = get_seconds();
shp->shm_nattch--;
if(shp->shm_nattch == 0 &&
shp->shm_perm.mode & SHM_DEST)
- shm_destroy (shp);
+ shm_destroy(ns, shp);
else
shm_unlock(shp);
- mutex_unlock(&shm_ids.mutex);
+ mutex_unlock(&shm_ids(ns).mutex);
}
static int shm_mmap(struct file * file, struct vm_area_struct * vma)
@@ -165,14 +232,25 @@
vma->vm_ops = &shm_vm_ops;
if (!(vma->vm_flags & VM_WRITE))
vma->vm_flags &= ~VM_MAYWRITE;
- shm_inc(file->f_dentry->d_inode->i_ino);
+ shm_inc(shm_file_ns(file), file->f_dentry->d_inode->i_ino);
}
return ret;
}
+static int shm_release(struct inode *ino, struct file *file)
+{
+ struct ipc_namespace *ns;
+
+ ns = shm_file_ns(file);
+ put_ipc_ns(ns);
+ shm_file_ns(file) = NULL;
+ return 0;
+}
+
static struct file_operations shm_file_operations = {
- .mmap = shm_mmap,
+ .mmap = shm_mmap,
+ .release = shm_release,
#ifndef CONFIG_MMU
.get_unmapped_area = shmem_get_unmapped_area,
#endif
@@ -188,7 +266,7 @@
#endif
};
-static int newseg (key_t key, int shmflg, size_t size)
+static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
{
int error;
struct shmid_kernel *shp;
@@ -197,10 +275,10 @@
char name[13];
int id;
- if (size < SHMMIN || size > shm_ctlmax)
+ if (size < SHMMIN || size > ns->shm_ctlmax)
return -EINVAL;
- if (shm_tot + numpages >= shm_ctlall)
+ if (ns->shm_tot + numpages >= ns->shm_ctlall)
return -ENOSPC;
shp = ipc_rcu_alloc(sizeof(*shp));
@@ -239,7 +317,7 @@
goto no_file;
error = -ENOSPC;
- id = shm_addid(shp);
+ id = shm_addid(ns, shp);
if(id == -1)
goto no_id;
@@ -249,15 +327,17 @@
shp->shm_ctim = get_seconds();
shp->shm_segsz = size;
shp->shm_nattch = 0;
- shp->id = shm_buildid(id,shp->shm_perm.seq);
+ shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
shp->shm_file = file;
file->f_dentry->d_inode->i_ino = shp->id;
+ shm_file_ns(file) = get_ipc_ns(ns);
+
/* Hugetlb ops would have already been assigned. */
if (!(shmflg & SHM_HUGETLB))
file->f_op = &shm_file_operations;
- shm_tot += numpages;
+ ns->shm_tot += numpages;
shm_unlock(shp);
return shp->id;
@@ -273,33 +353,36 @@
{
struct shmid_kernel *shp;
int err, id = 0;
+ struct ipc_namespace *ns;
- mutex_lock(&shm_ids.mutex);
+ ns = current->nsproxy->ipc_ns;
+
+ mutex_lock(&shm_ids(ns).mutex);
if (key == IPC_PRIVATE) {
- err = newseg(key, shmflg, size);
- } else if ((id = ipc_findkey(&shm_ids, key)) == -1) {
+ err = newseg(ns, key, shmflg, size);
+ } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) {
if (!(shmflg & IPC_CREAT))
err = -ENOENT;
else
- err = newseg(key, shmflg, size);
+ err = newseg(ns, key, shmflg, size);
} else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) {
err = -EEXIST;
} else {
- shp = shm_lock(id);
+ shp = shm_lock(ns, id);
BUG_ON(shp==NULL);
if (shp->shm_segsz < size)
err = -EINVAL;
else if (ipcperms(&shp->shm_perm, shmflg))
err = -EACCES;
else {
- int shmid = shm_buildid(id, shp->shm_perm.seq);
+ int shmid = shm_buildid(ns, id, shp->shm_perm.seq);
err = security_shm_associate(shp, shmflg);
if (!err)
err = shmid;
}
shm_unlock(shp);
}
- mutex_unlock(&shm_ids.mutex);
+ mutex_unlock(&shm_ids(ns).mutex);
return err;
}
@@ -395,18 +478,19 @@
}
}
-static void shm_get_stat(unsigned long *rss, unsigned long *swp)
+static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
+ unsigned long *swp)
{
int i;
*rss = 0;
*swp = 0;
- for (i = 0; i <= shm_ids.max_id; i++) {
+ for (i = 0; i <= shm_ids(ns).max_id; i++) {
struct shmid_kernel *shp;
struct inode *inode;
- shp = shm_get(i);
+ shp = shm_get(ns, i);
if(!shp)
continue;
@@ -430,6 +514,7 @@
struct shm_setbuf setbuf;
struct shmid_kernel *shp;
int err, version;
+ struct ipc_namespace *ns;
if (cmd < 0 || shmid < 0) {
err = -EINVAL;
@@ -437,6 +522,7 @@
}
version = ipc_parse_version(&cmd);
+ ns = current->nsproxy->ipc_ns;
switch (cmd) { /* replace with proc interface ? */
case IPC_INFO:
@@ -448,15 +534,15 @@
return err;
memset(&shminfo,0,sizeof(shminfo));
- shminfo.shmmni = shminfo.shmseg = shm_ctlmni;
- shminfo.shmmax = shm_ctlmax;
- shminfo.shmall = shm_ctlall;
+ shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
+ shminfo.shmmax = ns->shm_ctlmax;
+ shminfo.shmall = ns->shm_ctlall;
shminfo.shmmin = SHMMIN;
if(copy_shminfo_to_user (buf, &shminfo, version))
return -EFAULT;
/* reading a integer is always atomic */
- err= shm_ids.max_id;
+ err= shm_ids(ns).max_id;
if(err<0)
err = 0;
goto out;
@@ -470,14 +556,14 @@
return err;
memset(&shm_info,0,sizeof(shm_info));
- mutex_lock(&shm_ids.mutex);
- shm_info.used_ids = shm_ids.in_use;
- shm_get_stat (&shm_info.shm_rss, &shm_info.shm_swp);
- shm_info.shm_tot = shm_tot;
+ mutex_lock(&shm_ids(ns).mutex);
+ shm_info.used_ids = shm_ids(ns).in_use;
+ shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
+ shm_info.shm_tot = ns->shm_tot;
shm_info.swap_attempts = 0;
shm_info.swap_successes = 0;
- err = shm_ids.max_id;
- mutex_unlock(&shm_ids.mutex);
+ err = shm_ids(ns).max_id;
+ mutex_unlock(&shm_ids(ns).mutex);
if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
err = -EFAULT;
goto out;
@@ -492,17 +578,17 @@
struct shmid64_ds tbuf;
int result;
memset(&tbuf, 0, sizeof(tbuf));
- shp = shm_lock(shmid);
+ shp = shm_lock(ns, shmid);
if(shp==NULL) {
err = -EINVAL;
goto out;
} else if(cmd==SHM_STAT) {
err = -EINVAL;
- if (shmid > shm_ids.max_id)
+ if (shmid > shm_ids(ns).max_id)
goto out_unlock;
- result = shm_buildid(shmid, shp->shm_perm.seq);
+ result = shm_buildid(ns, shmid, shp->shm_perm.seq);
} else {
- err = shm_checkid(shp,shmid);
+ err = shm_checkid(ns, shp,shmid);
if(err)
goto out_unlock;
result = 0;
@@ -534,12 +620,12 @@
case SHM_LOCK:
case SHM_UNLOCK:
{
- shp = shm_lock(shmid);
+ shp = shm_lock(ns, shmid);
if(shp==NULL) {
err = -EINVAL;
goto out;
}
- err = shm_checkid(shp,shmid);
+ err = shm_checkid(ns, shp,shmid);
if(err)
goto out_unlock;
@@ -590,12 +676,12 @@
* Instead we set a destroyed flag, and then blow
* the name away when the usage hits zero.
*/
- mutex_lock(&shm_ids.mutex);
- shp = shm_lock(shmid);
+ mutex_lock(&shm_ids(ns).mutex);
+ shp = shm_lock(ns, shmid);
err = -EINVAL;
if (shp == NULL)
goto out_up;
- err = shm_checkid(shp, shmid);
+ err = shm_checkid(ns, shp, shmid);
if(err)
goto out_unlock_up;
@@ -614,14 +700,8 @@
if (err)
goto out_unlock_up;
- if (shp->shm_nattch){
- shp->shm_perm.mode |= SHM_DEST;
- /* Do not find it any more */
- shp->shm_perm.key = IPC_PRIVATE;
- shm_unlock(shp);
- } else
- shm_destroy (shp);
- mutex_unlock(&shm_ids.mutex);
+ do_shm_rmid(ns, shp);
+ mutex_unlock(&shm_ids(ns).mutex);
goto out;
}
@@ -631,12 +711,12 @@
err = -EFAULT;
goto out;
}
- mutex_lock(&shm_ids.mutex);
- shp = shm_lock(shmid);
+ mutex_lock(&shm_ids(ns).mutex);
+ shp = shm_lock(ns, shmid);
err=-EINVAL;
if(shp==NULL)
goto out_up;
- err = shm_checkid(shp,shmid);
+ err = shm_checkid(ns, shp,shmid);
if(err)
goto out_unlock_up;
err = audit_ipc_obj(&(shp->shm_perm));
@@ -673,7 +753,7 @@
out_unlock_up:
shm_unlock(shp);
out_up:
- mutex_unlock(&shm_ids.mutex);
+ mutex_unlock(&shm_ids(ns).mutex);
goto out;
out_unlock:
shm_unlock(shp);
@@ -699,6 +779,7 @@
unsigned long prot;
int acc_mode;
void *user_addr;
+ struct ipc_namespace *ns;
if (shmid < 0) {
err = -EINVAL;
@@ -737,12 +818,13 @@
* We cannot rely on the fs check since SYSV IPC does have an
* additional creator id...
*/
- shp = shm_lock(shmid);
+ ns = current->nsproxy->ipc_ns;
+ shp = shm_lock(ns, shmid);
if(shp == NULL) {
err = -EINVAL;
goto out;
}
- err = shm_checkid(shp,shmid);
+ err = shm_checkid(ns, shp,shmid);
if (err) {
shm_unlock(shp);
goto out;
@@ -783,16 +865,16 @@
invalid:
up_write(¤t->mm->mmap_sem);
- mutex_lock(&shm_ids.mutex);
- shp = shm_lock(shmid);
+ mutex_lock(&shm_ids(ns).mutex);
+ shp = shm_lock(ns, shmid);
BUG_ON(!shp);
shp->shm_nattch--;
if(shp->shm_nattch == 0 &&
shp->shm_perm.mode & SHM_DEST)
- shm_destroy (shp);
+ shm_destroy(ns, shp);
else
shm_unlock(shp);
- mutex_unlock(&shm_ids.mutex);
+ mutex_unlock(&shm_ids(ns).mutex);
*raddr = (unsigned long) user_addr;
err = 0;
