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ipc/shm.c
25.9 KB
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/* * linux/ipc/shm.c * Copyright (C) 1992, 1993 Krishna Balasubramanian * Many improvements/fixes by Bruno Haible. * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. * * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com> * BIGMEM support, Andrea Arcangeli <andrea@suse.de> * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr> * HIGHMEM support, Ingo Molnar <mingo@redhat.com> * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com> * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com> * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com> * |
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* support for audit of ipc object properties and permission changes * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
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* * namespaces support * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
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*/ |
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#include <linux/slab.h> #include <linux/mm.h> #include <linux/hugetlb.h> #include <linux/shm.h> #include <linux/init.h> #include <linux/file.h> #include <linux/mman.h> |
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#include <linux/shmem_fs.h> #include <linux/security.h> #include <linux/syscalls.h> #include <linux/audit.h> |
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#include <linux/capability.h> |
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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 <linux/mount.h> |
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|
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#include <asm/uaccess.h> #include "util.h" |
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struct shm_file_data { int id; struct ipc_namespace *ns; struct file *file; const struct vm_operations_struct *vm_ops; }; #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) |
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static const 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 init_shm_ids; #define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS])) |
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#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) |
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|
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static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size); |
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static void shm_open(struct vm_area_struct *vma); static void shm_close(struct vm_area_struct *vma); |
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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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static void __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids) |
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{ 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 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); } |
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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; |
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__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); |
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ipc_fini_ids(ns->ids[IPC_SHM_IDS]); |
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kfree(ns->ids[IPC_SHM_IDS]); ns->ids[IPC_SHM_IDS] = NULL; } |
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void __init shm_init (void) { |
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__shm_init_ns(&init_ipc_ns, &init_shm_ids); |
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ipc_init_proc_interface("sysvipc/shm", " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime ", |
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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 ipc_namespace *ns, struct shmid_kernel *s, int id) |
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{ |
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if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id)) |
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return -EIDRM; return 0; } |
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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(ns), id); |
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} |
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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(ns), &shp->shm_perm, ns->shm_ctlmni); |
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} |
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/* This is called by fork, once for every shm attach. */ static void shm_open(struct vm_area_struct *vma) |
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{ |
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struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); |
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struct shmid_kernel *shp; |
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shp = shm_lock(sfd->ns, sfd->id); |
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BUG_ON(!shp); |
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shp->shm_atim = get_seconds(); shp->shm_lprid = current->tgid; shp->shm_nattch++; shm_unlock(shp); } |
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/* * shm_destroy - free the struct shmid_kernel * * @shp: struct to free * |
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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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static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
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{ |
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ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; shm_rmid(ns, shp->id); |
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shm_unlock(shp); if (!is_file_hugepages(shp->shm_file)) shmem_lock(shp->shm_file, 0, shp->mlock_user); else |
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user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size, |
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shp->mlock_user); fput (shp->shm_file); security_shm_free(shp); ipc_rcu_putref(shp); } /* |
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* remove the attach descriptor vma. |
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* free memory for segment if it is marked destroyed. * The descriptor has already been removed from the current->mm->mmap list * and will later be kfree()d. */ |
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static void shm_close(struct vm_area_struct *vma) |
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{ |
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struct file * file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); |
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struct shmid_kernel *shp; |
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struct ipc_namespace *ns = sfd->ns; |
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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(ns, sfd->id); |
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BUG_ON(!shp); |
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shp->shm_lprid = current->tgid; shp->shm_dtim = get_seconds(); shp->shm_nattch--; if(shp->shm_nattch == 0 && |
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shp->shm_perm.mode & SHM_DEST) |
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shm_destroy(ns, shp); |
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else shm_unlock(shp); |
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mutex_unlock(&shm_ids(ns).mutex); |
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} |
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static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
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{ struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); |
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return sfd->vm_ops->fault(vma, vmf); |
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} #ifdef CONFIG_NUMA int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) { struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); int err = 0; if (sfd->vm_ops->set_policy) err = sfd->vm_ops->set_policy(vma, new); return err; } struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) { struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); struct mempolicy *pol = NULL; if (sfd->vm_ops->get_policy) pol = sfd->vm_ops->get_policy(vma, addr); |
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else if (vma->vm_policy) |
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pol = vma->vm_policy; |
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else pol = current->mempolicy; |
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return pol; } #endif |
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static int shm_mmap(struct file * file, struct vm_area_struct * vma) { |
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struct shm_file_data *sfd = shm_file_data(file); |
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int ret; |
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ret = sfd->file->f_op->mmap(sfd->file, vma); if (ret != 0) return ret; sfd->vm_ops = vma->vm_ops; |
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#ifdef CONFIG_MMU |
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BUG_ON(!sfd->vm_ops->fault); |
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#endif |
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vma->vm_ops = &shm_vm_ops; shm_open(vma); |
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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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struct shm_file_data *sfd = shm_file_data(file); |
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|
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put_ipc_ns(sfd->ns); shm_file_data(file) = NULL; kfree(sfd); |
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return 0; } |
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static int shm_fsync(struct file *file, struct dentry *dentry, int datasync) { int (*fsync) (struct file *, struct dentry *, int datasync); struct shm_file_data *sfd = shm_file_data(file); int ret = -EINVAL; fsync = sfd->file->f_op->fsync; if (fsync) ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync); return ret; } |
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static unsigned long shm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct shm_file_data *sfd = shm_file_data(file); |
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return get_unmapped_area(sfd->file, addr, len, pgoff, flags); } int is_file_shm_hugepages(struct file *file) { int ret = 0; if (file->f_op == &shm_file_operations) { struct shm_file_data *sfd; sfd = shm_file_data(file); ret = is_file_hugepages(sfd->file); } return ret; |
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} |
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|
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static const struct file_operations shm_file_operations = { |
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.mmap = shm_mmap, |
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.fsync = shm_fsync, |
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.release = shm_release, |
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.get_unmapped_area = shm_get_unmapped_area, |
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}; static struct vm_operations_struct shm_vm_ops = { .open = shm_open, /* callback for a new vm-area open */ .close = shm_close, /* callback for when the vm-area is released */ |
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.fault = shm_fault, |
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#if defined(CONFIG_NUMA) .set_policy = shm_set_policy, .get_policy = shm_get_policy, |
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#endif }; |
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static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size) |
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{ int error; struct shmid_kernel *shp; int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; struct file * file; char name[13]; int id; |
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if (size < SHMMIN || size > ns->shm_ctlmax) |
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return -EINVAL; |
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if (ns->shm_tot + numpages > ns->shm_ctlall) |
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return -ENOSPC; shp = ipc_rcu_alloc(sizeof(*shp)); if (!shp) return -ENOMEM; shp->shm_perm.key = key; |
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shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
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shp->mlock_user = NULL; shp->shm_perm.security = NULL; error = security_shm_alloc(shp); if (error) { ipc_rcu_putref(shp); return error; } |
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sprintf (name, "SYSV%08x", key); |
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if (shmflg & SHM_HUGETLB) { |
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/* hugetlb_file_setup takes care of mlock user accounting */ file = hugetlb_file_setup(name, size); |
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shp->mlock_user = current->user; } else { |
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int acctflag = VM_ACCOUNT; /* * Do not allow no accounting for OVERCOMMIT_NEVER, even * if it's asked for. */ if ((shmflg & SHM_NORESERVE) && sysctl_overcommit_memory != OVERCOMMIT_NEVER) acctflag = 0; |
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file = shmem_file_setup(name, size, acctflag); |
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} error = PTR_ERR(file); if (IS_ERR(file)) goto no_file; error = -ENOSPC; |
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id = shm_addid(ns, shp); |
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if(id == -1) goto no_id; shp->shm_cprid = current->tgid; shp->shm_lprid = 0; shp->shm_atim = shp->shm_dtim = 0; shp->shm_ctim = get_seconds(); shp->shm_segsz = size; shp->shm_nattch = 0; |
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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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/* * shmid gets reported as "inode#" in /proc/pid/maps. * proc-ps tools use this. Changing this will break them. */ file->f_dentry->d_inode->i_ino = shp->id; |
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|
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ns->shm_tot += numpages; |
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shm_unlock(shp); return shp->id; no_id: fput(file); no_file: security_shm_free(shp); ipc_rcu_putref(shp); return error; } asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) { struct shmid_kernel *shp; int err, id = 0; |
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struct ipc_namespace *ns; 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(ns, key, shmflg, size); } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) { |
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if (!(shmflg & IPC_CREAT)) err = -ENOENT; else |
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err = newseg(ns, key, shmflg, size); |
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} else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) { err = -EEXIST; } else { |
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shp = shm_lock(ns, id); |
9ba025f10 BUG_ON() Conversi... |
415 |
BUG_ON(shp==NULL); |
1da177e4c Linux-2.6.12-rc2 |
416 417 418 419 420 |
if (shp->shm_segsz < size) err = -EINVAL; else if (ipcperms(&shp->shm_perm, shmflg)) err = -EACCES; else { |
4e9823111 [PATCH] IPC names... |
421 |
int shmid = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4c Linux-2.6.12-rc2 |
422 423 424 425 426 427 |
err = security_shm_associate(shp, shmflg); if (!err) err = shmid; } shm_unlock(shp); } |
4e9823111 [PATCH] IPC names... |
428 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 |
return err; } static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) { switch(version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shmid_ds out; ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); out.shm_segsz = in->shm_segsz; out.shm_atime = in->shm_atime; out.shm_dtime = in->shm_dtime; out.shm_ctime = in->shm_ctime; out.shm_cpid = in->shm_cpid; out.shm_lpid = in->shm_lpid; out.shm_nattch = in->shm_nattch; return copy_to_user(buf, &out, sizeof(out)); } default: return -EINVAL; } } struct shm_setbuf { uid_t uid; gid_t gid; mode_t mode; }; static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version) { switch(version) { case IPC_64: { struct shmid64_ds tbuf; if (copy_from_user(&tbuf, buf, sizeof(tbuf))) return -EFAULT; out->uid = tbuf.shm_perm.uid; out->gid = tbuf.shm_perm.gid; |
b33291c0b [PATCH] ipc: expa... |
476 |
out->mode = tbuf.shm_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
477 478 479 480 481 482 483 484 485 486 487 488 |
return 0; } case IPC_OLD: { struct shmid_ds tbuf_old; if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) return -EFAULT; out->uid = tbuf_old.shm_perm.uid; out->gid = tbuf_old.shm_perm.gid; |
b33291c0b [PATCH] ipc: expa... |
489 |
out->mode = tbuf_old.shm_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 |
return 0; } default: return -EINVAL; } } static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) { switch(version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shminfo out; if(in->shmmax > INT_MAX) out.shmmax = INT_MAX; else out.shmmax = (int)in->shmmax; out.shmmin = in->shmmin; out.shmmni = in->shmmni; out.shmseg = in->shmseg; out.shmall = in->shmall; return copy_to_user(buf, &out, sizeof(out)); } default: return -EINVAL; } } |
4e9823111 [PATCH] IPC names... |
523 524 |
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, unsigned long *swp) |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 |
{ int i; *rss = 0; *swp = 0; |
4e9823111 [PATCH] IPC names... |
530 |
for (i = 0; i <= shm_ids(ns).max_id; i++) { |
1da177e4c Linux-2.6.12-rc2 |
531 532 |
struct shmid_kernel *shp; struct inode *inode; |
4e9823111 [PATCH] IPC names... |
533 |
shp = shm_get(ns, i); |
1da177e4c Linux-2.6.12-rc2 |
534 535 |
if(!shp) continue; |
6d63079ad [PATCH] struct pa... |
536 |
inode = shp->shm_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 |
if (is_file_hugepages(shp->shm_file)) { struct address_space *mapping = inode->i_mapping; *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages; } else { struct shmem_inode_info *info = SHMEM_I(inode); spin_lock(&info->lock); *rss += inode->i_mapping->nrpages; *swp += info->swapped; spin_unlock(&info->lock); } } } asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf) { struct shm_setbuf setbuf; struct shmid_kernel *shp; int err, version; |
4e9823111 [PATCH] IPC names... |
556 |
struct ipc_namespace *ns; |
1da177e4c Linux-2.6.12-rc2 |
557 558 559 560 561 562 563 |
if (cmd < 0 || shmid < 0) { err = -EINVAL; goto out; } version = ipc_parse_version(&cmd); |
4e9823111 [PATCH] IPC names... |
564 |
ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 568 569 570 571 572 573 574 575 |
switch (cmd) { /* replace with proc interface ? */ case IPC_INFO: { struct shminfo64 shminfo; err = security_shm_shmctl(NULL, cmd); if (err) return err; memset(&shminfo,0,sizeof(shminfo)); |
4e9823111 [PATCH] IPC names... |
576 577 578 |
shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; shminfo.shmmax = ns->shm_ctlmax; shminfo.shmall = ns->shm_ctlall; |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 583 |
shminfo.shmmin = SHMMIN; if(copy_shminfo_to_user (buf, &shminfo, version)) return -EFAULT; /* reading a integer is always atomic */ |
4e9823111 [PATCH] IPC names... |
584 |
err= shm_ids(ns).max_id; |
1da177e4c Linux-2.6.12-rc2 |
585 586 587 588 589 590 591 592 593 594 595 596 597 |
if(err<0) err = 0; goto out; } case SHM_INFO: { struct shm_info shm_info; err = security_shm_shmctl(NULL, cmd); if (err) return err; memset(&shm_info,0,sizeof(shm_info)); |
4e9823111 [PATCH] IPC names... |
598 599 600 601 |
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; |
1da177e4c Linux-2.6.12-rc2 |
602 603 |
shm_info.swap_attempts = 0; shm_info.swap_successes = 0; |
4e9823111 [PATCH] IPC names... |
604 605 |
err = shm_ids(ns).max_id; mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 610 611 612 613 614 615 616 617 618 619 |
if(copy_to_user (buf, &shm_info, sizeof(shm_info))) { err = -EFAULT; goto out; } err = err < 0 ? 0 : err; goto out; } case SHM_STAT: case IPC_STAT: { struct shmid64_ds tbuf; int result; memset(&tbuf, 0, sizeof(tbuf)); |
4e9823111 [PATCH] IPC names... |
620 |
shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
621 622 623 624 625 |
if(shp==NULL) { err = -EINVAL; goto out; } else if(cmd==SHM_STAT) { err = -EINVAL; |
4e9823111 [PATCH] IPC names... |
626 |
if (shmid > shm_ids(ns).max_id) |
1da177e4c Linux-2.6.12-rc2 |
627 |
goto out_unlock; |
4e9823111 [PATCH] IPC names... |
628 |
result = shm_buildid(ns, shmid, shp->shm_perm.seq); |
1da177e4c Linux-2.6.12-rc2 |
629 |
} else { |
4e9823111 [PATCH] IPC names... |
630 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 |
if(err) goto out_unlock; result = 0; } err=-EACCES; if (ipcperms (&shp->shm_perm, S_IRUGO)) goto out_unlock; err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock; kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); tbuf.shm_segsz = shp->shm_segsz; tbuf.shm_atime = shp->shm_atim; tbuf.shm_dtime = shp->shm_dtim; tbuf.shm_ctime = shp->shm_ctim; tbuf.shm_cpid = shp->shm_cprid; tbuf.shm_lpid = shp->shm_lprid; |
bc56bba8f [PATCH] shm: make... |
648 |
tbuf.shm_nattch = shp->shm_nattch; |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 654 655 656 657 658 |
shm_unlock(shp); if(copy_shmid_to_user (buf, &tbuf, version)) err = -EFAULT; else err = result; goto out; } case SHM_LOCK: case SHM_UNLOCK: { |
4e9823111 [PATCH] IPC names... |
659 |
shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
660 661 662 663 |
if(shp==NULL) { err = -EINVAL; goto out; } |
4e9823111 [PATCH] IPC names... |
664 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
665 666 |
if(err) goto out_unlock; |
073115d6b [PATCH] Rework of... |
667 668 669 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 |
if (!capable(CAP_IPC_LOCK)) { err = -EPERM; if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid) goto out_unlock; if (cmd == SHM_LOCK && !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur) goto out_unlock; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock; if(cmd==SHM_LOCK) { struct user_struct * user = current->user; if (!is_file_hugepages(shp->shm_file)) { err = shmem_lock(shp->shm_file, 1, user); |
7be77e20d Fix user struct l... |
688 |
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){ |
b33291c0b [PATCH] ipc: expa... |
689 |
shp->shm_perm.mode |= SHM_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
690 691 692 693 694 |
shp->mlock_user = user; } } } else if (!is_file_hugepages(shp->shm_file)) { shmem_lock(shp->shm_file, 0, shp->mlock_user); |
b33291c0b [PATCH] ipc: expa... |
695 |
shp->shm_perm.mode &= ~SHM_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 |
shp->mlock_user = NULL; } shm_unlock(shp); goto out; } case IPC_RMID: { /* * We cannot simply remove the file. The SVID states * that the block remains until the last person * detaches from it, then is deleted. A shmat() on * an RMID segment is legal in older Linux and if * we change it apps break... * * Instead we set a destroyed flag, and then blow * the name away when the usage hits zero. */ |
4e9823111 [PATCH] IPC names... |
713 714 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 |
err = -EINVAL; if (shp == NULL) goto out_up; |
4e9823111 [PATCH] IPC names... |
718 |
err = shm_checkid(ns, shp, shmid); |
1da177e4c Linux-2.6.12-rc2 |
719 720 |
if(err) goto out_unlock_up; |
073115d6b [PATCH] Rework of... |
721 722 723 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock_up; |
1da177e4c Linux-2.6.12-rc2 |
724 725 726 727 728 729 730 731 732 733 |
if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid && !capable(CAP_SYS_ADMIN)) { err=-EPERM; goto out_unlock_up; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock_up; |
4e9823111 [PATCH] IPC names... |
734 735 |
do_shm_rmid(ns, shp); mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 740 741 742 743 744 |
goto out; } case IPC_SET: { if (copy_shmid_from_user (&setbuf, buf, version)) { err = -EFAULT; goto out; } |
4e9823111 [PATCH] IPC names... |
745 746 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
747 748 749 |
err=-EINVAL; if(shp==NULL) goto out_up; |
4e9823111 [PATCH] IPC names... |
750 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
751 752 |
if(err) goto out_unlock_up; |
073115d6b [PATCH] Rework of... |
753 754 755 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock_up; |
ac03221a4 [PATCH] update of... |
756 |
err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode); |
073115d6b [PATCH] Rework of... |
757 758 |
if (err) goto out_unlock_up; |
1da177e4c Linux-2.6.12-rc2 |
759 760 761 762 763 764 765 766 767 768 769 770 771 |
err=-EPERM; if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid && !capable(CAP_SYS_ADMIN)) { goto out_unlock_up; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock_up; shp->shm_perm.uid = setbuf.uid; shp->shm_perm.gid = setbuf.gid; |
b33291c0b [PATCH] ipc: expa... |
772 |
shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO) |
1da177e4c Linux-2.6.12-rc2 |
773 774 775 776 777 778 779 780 781 782 783 784 785 786 |
| (setbuf.mode & S_IRWXUGO); shp->shm_ctim = get_seconds(); break; } default: err = -EINVAL; goto out; } err = 0; out_unlock_up: shm_unlock(shp); out_up: |
4e9823111 [PATCH] IPC names... |
787 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 |
goto out; out_unlock: shm_unlock(shp); out: return err; } /* * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. * * NOTE! Despite the name, this is NOT a direct system call entrypoint. The * "raddr" thing points to kernel space, and there has to be a wrapper around * this. */ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) { struct shmid_kernel *shp; unsigned long addr; unsigned long size; struct file * file; int err; unsigned long flags; unsigned long prot; |
1da177e4c Linux-2.6.12-rc2 |
811 |
int acc_mode; |
bc56bba8f [PATCH] shm: make... |
812 |
unsigned long user_addr; |
4e9823111 [PATCH] IPC names... |
813 |
struct ipc_namespace *ns; |
bc56bba8f [PATCH] shm: make... |
814 815 816 |
struct shm_file_data *sfd; struct path path; mode_t f_mode; |
1da177e4c Linux-2.6.12-rc2 |
817 |
|
bc56bba8f [PATCH] shm: make... |
818 819 |
err = -EINVAL; if (shmid < 0) |
1da177e4c Linux-2.6.12-rc2 |
820 |
goto out; |
bc56bba8f [PATCH] shm: make... |
821 |
else if ((addr = (ulong)shmaddr)) { |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 827 828 |
if (addr & (SHMLBA-1)) { if (shmflg & SHM_RND) addr &= ~(SHMLBA-1); /* round down */ else #ifndef __ARCH_FORCE_SHMLBA if (addr & ~PAGE_MASK) #endif |
bc56bba8f [PATCH] shm: make... |
829 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 |
} flags = MAP_SHARED | MAP_FIXED; } else { if ((shmflg & SHM_REMAP)) |
bc56bba8f [PATCH] shm: make... |
834 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
835 836 837 838 839 840 |
flags = MAP_SHARED; } if (shmflg & SHM_RDONLY) { prot = PROT_READ; |
1da177e4c Linux-2.6.12-rc2 |
841 |
acc_mode = S_IRUGO; |
bc56bba8f [PATCH] shm: make... |
842 |
f_mode = FMODE_READ; |
1da177e4c Linux-2.6.12-rc2 |
843 844 |
} else { prot = PROT_READ | PROT_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
845 |
acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8f [PATCH] shm: make... |
846 |
f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
847 848 849 850 851 852 853 854 855 856 |
} if (shmflg & SHM_EXEC) { prot |= PROT_EXEC; acc_mode |= S_IXUGO; } /* * We cannot rely on the fs check since SYSV IPC does have an * additional creator id... */ |
4e9823111 [PATCH] IPC names... |
857 858 |
ns = current->nsproxy->ipc_ns; shp = shm_lock(ns, shmid); |
bc56bba8f [PATCH] shm: make... |
859 |
if(shp == NULL) |
1da177e4c Linux-2.6.12-rc2 |
860 |
goto out; |
bc56bba8f [PATCH] shm: make... |
861 |
|
4e9823111 [PATCH] IPC names... |
862 |
err = shm_checkid(ns, shp,shmid); |
bc56bba8f [PATCH] shm: make... |
863 864 865 866 867 868 |
if (err) goto out_unlock; err = -EACCES; if (ipcperms(&shp->shm_perm, acc_mode)) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
869 870 |
err = security_shm_shmat(shp, shmaddr, shmflg); |
bc56bba8f [PATCH] shm: make... |
871 872 873 874 875 |
if (err) goto out_unlock; path.dentry = dget(shp->shm_file->f_path.dentry); path.mnt = mntget(shp->shm_file->f_path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
876 |
shp->shm_nattch++; |
bc56bba8f [PATCH] shm: make... |
877 |
size = i_size_read(path.dentry->d_inode); |
1da177e4c Linux-2.6.12-rc2 |
878 |
shm_unlock(shp); |
bc56bba8f [PATCH] shm: make... |
879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 |
err = -ENOMEM; sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); if (!sfd) goto out_put_path; err = -ENOMEM; file = get_empty_filp(); if (!file) goto out_free; file->f_op = &shm_file_operations; file->private_data = sfd; file->f_path = path; file->f_mapping = shp->shm_file->f_mapping; file->f_mode = f_mode; sfd->id = shp->id; sfd->ns = get_ipc_ns(ns); sfd->file = shp->shm_file; sfd->vm_ops = NULL; |
1da177e4c Linux-2.6.12-rc2 |
898 899 |
down_write(¤t->mm->mmap_sem); if (addr && !(shmflg & SHM_REMAP)) { |
bc56bba8f [PATCH] shm: make... |
900 |
err = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 904 905 906 907 908 909 910 911 |
if (find_vma_intersection(current->mm, addr, addr + size)) goto invalid; /* * If shm segment goes below stack, make sure there is some * space left for the stack to grow (at least 4 pages). */ if (addr < current->mm->start_stack && addr > current->mm->start_stack - size - PAGE_SIZE * 5) goto invalid; } |
bc56bba8f [PATCH] shm: make... |
912 913 914 915 916 |
user_addr = do_mmap (file, addr, size, prot, flags, 0); *raddr = user_addr; err = 0; if (IS_ERR_VALUE(user_addr)) err = (long)user_addr; |
1da177e4c Linux-2.6.12-rc2 |
917 918 |
invalid: up_write(¤t->mm->mmap_sem); |
bc56bba8f [PATCH] shm: make... |
919 920 921 |
fput(file); out_nattch: |
4e9823111 [PATCH] IPC names... |
922 923 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
9ba025f10 BUG_ON() Conversi... |
924 |
BUG_ON(!shp); |
1da177e4c Linux-2.6.12-rc2 |
925 926 |
shp->shm_nattch--; if(shp->shm_nattch == 0 && |
b33291c0b [PATCH] ipc: expa... |
927 |
shp->shm_perm.mode & SHM_DEST) |
4e9823111 [PATCH] IPC names... |
928 |
shm_destroy(ns, shp); |
1da177e4c Linux-2.6.12-rc2 |
929 930 |
else shm_unlock(shp); |
4e9823111 [PATCH] IPC names... |
931 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
932 |
|
1da177e4c Linux-2.6.12-rc2 |
933 934 |
out: return err; |
bc56bba8f [PATCH] shm: make... |
935 936 937 938 939 940 941 942 943 944 945 |
out_unlock: shm_unlock(shp); goto out; out_free: kfree(sfd); out_put_path: dput(path.dentry); mntput(path.mnt); goto out_nattch; |
1da177e4c Linux-2.6.12-rc2 |
946 |
} |
7d87e14c2 [PATCH] consolida... |
947 948 949 950 951 952 953 954 955 956 957 |
asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) { unsigned long ret; long err; err = do_shmat(shmid, shmaddr, shmflg, &ret); if (err) return err; force_successful_syscall_return(); return (long)ret; } |
1da177e4c Linux-2.6.12-rc2 |
958 959 960 961 962 963 964 965 966 967 968 |
/* * detach and kill segment if marked destroyed. * The work is done in shm_close. */ asmlinkage long sys_shmdt(char __user *shmaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *next; unsigned long addr = (unsigned long)shmaddr; loff_t size = 0; int retval = -EINVAL; |
df1e2fb54 [PATCH] shmdt: ch... |
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if (addr & ~PAGE_MASK) return retval; |
1da177e4c Linux-2.6.12-rc2 |
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down_write(&mm->mmap_sem); /* * This function tries to be smart and unmap shm segments that * were modified by partial mlock or munmap calls: * - It first determines the size of the shm segment that should be * unmapped: It searches for a vma that is backed by shm and that * started at address shmaddr. It records it's size and then unmaps * it. * - Then it unmaps all shm vmas that started at shmaddr and that * are within the initially determined size. * Errors from do_munmap are ignored: the function only fails if * it's called with invalid parameters or if it's called to unmap * a part of a vma. Both calls in this function are for full vmas, * the parameters are directly copied from the vma itself and always * valid - therefore do_munmap cannot fail. (famous last words?) */ /* * If it had been mremap()'d, the starting address would not * match the usual checks anyway. So assume all vma's are * above the starting address given. */ vma = find_vma(mm, addr); while (vma) { next = vma->vm_next; /* * Check if the starting address would match, i.e. it's * a fragment created by mprotect() and/or munmap(), or it * otherwise it starts at this address with no hassles. */ |
bc56bba8f [PATCH] shm: make... |
1003 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1004 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
6d63079ad [PATCH] struct pa... |
1005 |
size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1da177e4c Linux-2.6.12-rc2 |
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do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); /* * We discovered the size of the shm segment, so * break out of here and fall through to the next * loop that uses the size information to stop * searching for matching vma's. */ retval = 0; vma = next; break; } vma = next; } /* * We need look no further than the maximum address a fragment * could possibly have landed at. Also cast things to loff_t to * prevent overflows and make comparisions vs. equal-width types. */ |
8e36709d8 [PATCH] shmdt can... |
1025 |
size = PAGE_ALIGN(size); |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 1028 1029 |
while (vma && (loff_t)(vma->vm_end - addr) <= size) { next = vma->vm_next; /* finding a matching vma now does not alter retval */ |
bc56bba8f [PATCH] shm: make... |
1030 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); vma = next; } up_write(&mm->mmap_sem); return retval; } #ifdef CONFIG_PROC_FS |
19b4946ca [PATCH] ipc: conv... |
1042 |
static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4c Linux-2.6.12-rc2 |
1043 |
{ |
19b4946ca [PATCH] ipc: conv... |
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struct shmid_kernel *shp = it; char *format; |
1da177e4c Linux-2.6.12-rc2 |
1046 |
|
1da177e4c Linux-2.6.12-rc2 |
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#define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu " #define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu " |
1da177e4c Linux-2.6.12-rc2 |
1051 |
|
19b4946ca [PATCH] ipc: conv... |
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if (sizeof(size_t) <= sizeof(int)) format = SMALL_STRING; else format = BIG_STRING; return seq_printf(s, format, shp->shm_perm.key, shp->id, |
b33291c0b [PATCH] ipc: expa... |
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shp->shm_perm.mode, |
19b4946ca [PATCH] ipc: conv... |
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shp->shm_segsz, shp->shm_cprid, shp->shm_lprid, |
bc56bba8f [PATCH] shm: make... |
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shp->shm_nattch, |
19b4946ca [PATCH] ipc: conv... |
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shp->shm_perm.uid, shp->shm_perm.gid, shp->shm_perm.cuid, shp->shm_perm.cgid, shp->shm_atim, shp->shm_dtim, shp->shm_ctim); |
1da177e4c Linux-2.6.12-rc2 |
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} #endif |