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[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>
This commit is contained in:
Kirill Korotaev
Linus Torvalds
parent
e38935341a
commit
4e9823111b
1 changed files with 168 additions and 86 deletions
250
ipc/shm.c
250
ipc/shm.c
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@ -15,6 +15,10 @@
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*
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* support for audit of ipc object properties and permission changes
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* Dustin Kirkland <dustin.kirkland@us.ibm.com>
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*
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* namespaces support
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* OpenVZ, SWsoft Inc.
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* Pavel Emelianov <xemul@openvz.org>
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*/
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#include <linux/slab.h>
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@ -32,6 +36,7 @@
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#include <linux/ptrace.h>
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#include <linux/seq_file.h>
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#include <linux/mutex.h>
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#include <linux/nsproxy.h>
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#include <asm/uaccess.h>
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@ -40,59 +45,115 @@
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static struct file_operations shm_file_operations;
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static struct vm_operations_struct shm_vm_ops;
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static struct ipc_ids shm_ids;
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static struct ipc_ids init_shm_ids;
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#define shm_lock(id) ((struct shmid_kernel*)ipc_lock(&shm_ids,id))
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#define shm_unlock(shp) ipc_unlock(&(shp)->shm_perm)
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#define shm_get(id) ((struct shmid_kernel*)ipc_get(&shm_ids,id))
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#define shm_buildid(id, seq) \
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ipc_buildid(&shm_ids, id, seq)
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#define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS]))
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static int newseg (key_t key, int shmflg, size_t size);
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#define shm_lock(ns, id) \
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((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
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#define shm_unlock(shp) \
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ipc_unlock(&(shp)->shm_perm)
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#define shm_get(ns, id) \
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((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
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#define shm_buildid(ns, id, seq) \
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ipc_buildid(&shm_ids(ns), id, seq)
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static int newseg (struct ipc_namespace *ns, key_t key,
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int shmflg, size_t size);
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static void shm_open (struct vm_area_struct *shmd);
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static void shm_close (struct vm_area_struct *shmd);
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static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
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#ifdef CONFIG_PROC_FS
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static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
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#endif
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size_t shm_ctlmax = SHMMAX;
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size_t shm_ctlall = SHMALL;
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int shm_ctlmni = SHMMNI;
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static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
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{
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ns->ids[IPC_SHM_IDS] = ids;
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ns->shm_ctlmax = SHMMAX;
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ns->shm_ctlall = SHMALL;
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ns->shm_ctlmni = SHMMNI;
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ns->shm_tot = 0;
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ipc_init_ids(ids, 1);
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}
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static int shm_tot; /* total number of shared memory pages */
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static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
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{
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if (shp->shm_nattch){
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shp->shm_perm.mode |= SHM_DEST;
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/* Do not find it any more */
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shp->shm_perm.key = IPC_PRIVATE;
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shm_unlock(shp);
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} else
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shm_destroy(ns, shp);
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}
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#ifdef CONFIG_IPC_NS
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int shm_init_ns(struct ipc_namespace *ns)
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{
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struct ipc_ids *ids;
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ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
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if (ids == NULL)
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return -ENOMEM;
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__shm_init_ns(ns, ids);
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return 0;
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}
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void shm_exit_ns(struct ipc_namespace *ns)
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{
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int i;
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struct shmid_kernel *shp;
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mutex_lock(&shm_ids(ns).mutex);
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for (i = 0; i <= shm_ids(ns).max_id; i++) {
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shp = shm_lock(ns, i);
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if (shp == NULL)
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continue;
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do_shm_rmid(ns, shp);
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}
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mutex_unlock(&shm_ids(ns).mutex);
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kfree(ns->ids[IPC_SHM_IDS]);
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ns->ids[IPC_SHM_IDS] = NULL;
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}
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#endif
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void __init shm_init (void)
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{
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ipc_init_ids(&shm_ids, 1);
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__shm_init_ns(&init_ipc_ns, &init_shm_ids);
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ipc_init_proc_interface("sysvipc/shm",
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" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n",
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&shm_ids,
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sysvipc_shm_proc_show);
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IPC_SHM_IDS, sysvipc_shm_proc_show);
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}
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static inline int shm_checkid(struct shmid_kernel *s, int id)
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static inline int shm_checkid(struct ipc_namespace *ns,
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struct shmid_kernel *s, int id)
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{
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if (ipc_checkid(&shm_ids,&s->shm_perm,id))
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if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
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return -EIDRM;
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return 0;
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}
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static inline struct shmid_kernel *shm_rmid(int id)
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static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
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{
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return (struct shmid_kernel *)ipc_rmid(&shm_ids,id);
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return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
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}
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static inline int shm_addid(struct shmid_kernel *shp)
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static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp)
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{
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return ipc_addid(&shm_ids, &shp->shm_perm, shm_ctlmni);
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return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
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}
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static inline void shm_inc (int id) {
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static inline void shm_inc(struct ipc_namespace *ns, int id)
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{
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struct shmid_kernel *shp;
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shp = shm_lock(id);
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shp = shm_lock(ns, id);
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BUG_ON(!shp);
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shp->shm_atim = get_seconds();
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shp->shm_lprid = current->tgid;
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@ -100,10 +161,13 @@ static inline void shm_inc (int id) {
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shm_unlock(shp);
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}
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#define shm_file_ns(file) (*((struct ipc_namespace **)&(file)->private_data))
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/* This is called by fork, once for every shm attach. */
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static void shm_open(struct vm_area_struct *shmd)
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{
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shm_inc (shmd->vm_file->f_dentry->d_inode->i_ino);
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shm_inc(shm_file_ns(shmd->vm_file),
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shmd->vm_file->f_dentry->d_inode->i_ino);
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}
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/*
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@ -114,10 +178,10 @@ static void shm_open (struct vm_area_struct *shmd)
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* It has to be called with shp and shm_ids.mutex locked,
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* but returns with shp unlocked and freed.
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*/
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static void shm_destroy (struct shmid_kernel *shp)
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static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
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{
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shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
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shm_rmid (shp->id);
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ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
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shm_rmid(ns, shp->id);
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shm_unlock(shp);
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if (!is_file_hugepages(shp->shm_file))
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shmem_lock(shp->shm_file, 0, shp->mlock_user);
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@ -140,20 +204,23 @@ static void shm_close (struct vm_area_struct *shmd)
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struct file * file = shmd->vm_file;
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int id = file->f_dentry->d_inode->i_ino;
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struct shmid_kernel *shp;
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struct ipc_namespace *ns;
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mutex_lock(&shm_ids.mutex);
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ns = shm_file_ns(file);
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mutex_lock(&shm_ids(ns).mutex);
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/* remove from the list of attaches of the shm segment */
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shp = shm_lock(id);
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shp = shm_lock(ns, id);
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BUG_ON(!shp);
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shp->shm_lprid = current->tgid;
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shp->shm_dtim = get_seconds();
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shp->shm_nattch--;
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if(shp->shm_nattch == 0 &&
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shp->shm_perm.mode & SHM_DEST)
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shm_destroy (shp);
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shm_destroy(ns, shp);
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else
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shm_unlock(shp);
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mutex_unlock(&shm_ids.mutex);
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mutex_unlock(&shm_ids(ns).mutex);
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}
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static int shm_mmap(struct file * file, struct vm_area_struct * vma)
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vma->vm_ops = &shm_vm_ops;
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if (!(vma->vm_flags & VM_WRITE))
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vma->vm_flags &= ~VM_MAYWRITE;
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shm_inc(file->f_dentry->d_inode->i_ino);
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shm_inc(shm_file_ns(file), file->f_dentry->d_inode->i_ino);
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}
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return ret;
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}
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static int shm_release(struct inode *ino, struct file *file)
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{
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struct ipc_namespace *ns;
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ns = shm_file_ns(file);
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put_ipc_ns(ns);
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shm_file_ns(file) = NULL;
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return 0;
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}
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static struct file_operations shm_file_operations = {
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.mmap = shm_mmap,
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.release = shm_release,
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#ifndef CONFIG_MMU
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.get_unmapped_area = shmem_get_unmapped_area,
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#endif
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@ -188,7 +266,7 @@ static struct vm_operations_struct shm_vm_ops = {
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#endif
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};
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static int newseg (key_t key, int shmflg, size_t size)
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static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
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{
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int error;
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struct shmid_kernel *shp;
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@ -197,10 +275,10 @@ static int newseg (key_t key, int shmflg, size_t size)
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char name[13];
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int id;
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if (size < SHMMIN || size > shm_ctlmax)
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if (size < SHMMIN || size > ns->shm_ctlmax)
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return -EINVAL;
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if (shm_tot + numpages >= shm_ctlall)
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if (ns->shm_tot + numpages >= ns->shm_ctlall)
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return -ENOSPC;
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shp = ipc_rcu_alloc(sizeof(*shp));
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@ -239,7 +317,7 @@ static int newseg (key_t key, int shmflg, size_t size)
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goto no_file;
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error = -ENOSPC;
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id = shm_addid(shp);
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id = shm_addid(ns, shp);
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if(id == -1)
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goto no_id;
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@ -249,15 +327,17 @@ static int newseg (key_t key, int shmflg, size_t size)
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shp->shm_ctim = get_seconds();
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shp->shm_segsz = size;
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shp->shm_nattch = 0;
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shp->id = shm_buildid(id,shp->shm_perm.seq);
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shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
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shp->shm_file = file;
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file->f_dentry->d_inode->i_ino = shp->id;
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shm_file_ns(file) = get_ipc_ns(ns);
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/* Hugetlb ops would have already been assigned. */
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if (!(shmflg & SHM_HUGETLB))
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file->f_op = &shm_file_operations;
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shm_tot += numpages;
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ns->shm_tot += numpages;
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shm_unlock(shp);
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return shp->id;
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@ -273,33 +353,36 @@ asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
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{
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struct shmid_kernel *shp;
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int err, id = 0;
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struct ipc_namespace *ns;
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mutex_lock(&shm_ids.mutex);
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ns = current->nsproxy->ipc_ns;
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mutex_lock(&shm_ids(ns).mutex);
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if (key == IPC_PRIVATE) {
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err = newseg(key, shmflg, size);
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} else if ((id = ipc_findkey(&shm_ids, key)) == -1) {
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err = newseg(ns, key, shmflg, size);
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} else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) {
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if (!(shmflg & IPC_CREAT))
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err = -ENOENT;
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else
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err = newseg(key, shmflg, size);
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err = newseg(ns, key, shmflg, size);
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} else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) {
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err = -EEXIST;
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} else {
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shp = shm_lock(id);
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shp = shm_lock(ns, id);
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BUG_ON(shp==NULL);
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if (shp->shm_segsz < size)
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err = -EINVAL;
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else if (ipcperms(&shp->shm_perm, shmflg))
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err = -EACCES;
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else {
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int shmid = shm_buildid(id, shp->shm_perm.seq);
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int shmid = shm_buildid(ns, id, shp->shm_perm.seq);
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err = security_shm_associate(shp, shmflg);
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if (!err)
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err = shmid;
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}
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shm_unlock(shp);
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}
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mutex_unlock(&shm_ids.mutex);
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mutex_unlock(&shm_ids(ns).mutex);
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return err;
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}
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@ -395,18 +478,19 @@ static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminf
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}
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}
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static void shm_get_stat(unsigned long *rss, unsigned long *swp)
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static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
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unsigned long *swp)
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{
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int i;
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*rss = 0;
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*swp = 0;
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for (i = 0; i <= shm_ids.max_id; i++) {
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for (i = 0; i <= shm_ids(ns).max_id; i++) {
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struct shmid_kernel *shp;
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struct inode *inode;
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shp = shm_get(i);
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shp = shm_get(ns, i);
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if(!shp)
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continue;
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@ -430,6 +514,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
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struct shm_setbuf setbuf;
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struct shmid_kernel *shp;
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int err, version;
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struct ipc_namespace *ns;
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if (cmd < 0 || shmid < 0) {
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err = -EINVAL;
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@ -437,6 +522,7 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
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}
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version = ipc_parse_version(&cmd);
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ns = current->nsproxy->ipc_ns;
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switch (cmd) { /* replace with proc interface ? */
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case IPC_INFO:
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@ -448,15 +534,15 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
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return err;
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memset(&shminfo,0,sizeof(shminfo));
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shminfo.shmmni = shminfo.shmseg = shm_ctlmni;
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shminfo.shmmax = shm_ctlmax;
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shminfo.shmall = shm_ctlall;
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shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
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shminfo.shmmax = ns->shm_ctlmax;
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shminfo.shmall = ns->shm_ctlall;
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shminfo.shmmin = SHMMIN;
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if(copy_shminfo_to_user (buf, &shminfo, version))
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return -EFAULT;
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/* reading a integer is always atomic */
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err= shm_ids.max_id;
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err= shm_ids(ns).max_id;
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if(err<0)
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err = 0;
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goto out;
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@ -470,14 +556,14 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
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return err;
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memset(&shm_info,0,sizeof(shm_info));
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mutex_lock(&shm_ids.mutex);
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shm_info.used_ids = shm_ids.in_use;
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shm_get_stat (&shm_info.shm_rss, &shm_info.shm_swp);
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shm_info.shm_tot = shm_tot;
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mutex_lock(&shm_ids(ns).mutex);
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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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
* 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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
|
|||
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 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
|
|||
unsigned long prot;
|
||||
int acc_mode;
|
||||
void *user_addr;
|
||||
struct ipc_namespace *ns;
|
||||
|
||||
if (shmid < 0) {
|
||||
err = -EINVAL;
|
||||
|
|
@ -737,12 +818,13 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
|
|||
* 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 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
|
|||
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;
|
||||
|
|
|
|||
Loading…
Reference in a new issue