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ipc/shm.c
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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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* * Better ipc lock (kern_ipc_perm.lock) handling * Davidlohr Bueso <davidlohr.bueso@hp.com>, June 2013. |
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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/rwsem.h> |
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#include <linux/nsproxy.h> |
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#include <linux/mount.h> |
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#include <linux/ipc_namespace.h> |
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|
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#include <linux/uaccess.h> |
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#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 const struct vm_operations_struct shm_vm_ops; |
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#define shm_ids(ns) ((ns)->ids[IPC_SHM_IDS]) |
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|
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#define shm_unlock(shp) \ ipc_unlock(&(shp)->shm_perm) |
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|
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static int newseg(struct ipc_namespace *, struct ipc_params *); |
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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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void shm_init_ns(struct ipc_namespace *ns) |
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{ |
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ns->shm_ctlmax = SHMMAX; ns->shm_ctlall = SHMALL; ns->shm_ctlmni = SHMMNI; |
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ns->shm_rmid_forced = 0; |
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ns->shm_tot = 0; |
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ipc_init_ids(&shm_ids(ns)); |
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} |
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/* |
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* Called with shm_ids.rwsem (writer) and the shp structure locked. * Only shm_ids.rwsem remains locked on exit. |
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*/ |
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static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
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{ |
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struct shmid_kernel *shp; shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
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if (shp->shm_nattch) { |
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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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#ifdef CONFIG_IPC_NS |
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void shm_exit_ns(struct ipc_namespace *ns) { |
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free_ipcs(ns, &shm_ids(ns), do_shm_rmid); |
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idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr); |
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} |
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#endif |
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static int __init ipc_ns_init(void) |
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{ |
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shm_init_ns(&init_ipc_ns); |
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return 0; } pure_initcall(ipc_ns_init); |
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void __init shm_init(void) |
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{ |
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ipc_init_proc_interface("sysvipc/shm", |
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#if BITS_PER_LONG <= 32 " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap ", #else " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap ", #endif |
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IPC_SHM_IDS, sysvipc_shm_proc_show); |
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} |
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static inline struct shmid_kernel *shm_obtain_object(struct ipc_namespace *ns, int id) { struct kern_ipc_perm *ipcp = ipc_obtain_object(&shm_ids(ns), id); if (IS_ERR(ipcp)) return ERR_CAST(ipcp); return container_of(ipcp, struct shmid_kernel, shm_perm); } static inline struct shmid_kernel *shm_obtain_object_check(struct ipc_namespace *ns, int id) { struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&shm_ids(ns), id); if (IS_ERR(ipcp)) return ERR_CAST(ipcp); return container_of(ipcp, struct shmid_kernel, shm_perm); } |
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/* |
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* shm_lock_(check_) routines are called in the paths where the rwsem |
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* is not necessarily held. |
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*/ |
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static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id) |
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{ |
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struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id); |
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if (IS_ERR(ipcp)) return (struct shmid_kernel *)ipcp; |
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return container_of(ipcp, struct shmid_kernel, shm_perm); |
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} |
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static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp) { rcu_read_lock(); |
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ipc_lock_object(&ipcp->shm_perm); |
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} |
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static void shm_rcu_free(struct rcu_head *head) { struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu); struct shmid_kernel *shp = ipc_rcu_to_struct(p); security_shm_free(shp); ipc_rcu_free(head); } |
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static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s) |
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{ |
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list_del(&s->shm_clist); |
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ipc_rmid(&shm_ids(ns), &s->shm_perm); |
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} |
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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(IS_ERR(shp)); |
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shp->shm_atim = get_seconds(); |
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shp->shm_lprid = task_tgid_vnr(current); |
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shp->shm_nattch++; shm_unlock(shp); } |
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/* * shm_destroy - free the struct shmid_kernel * |
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* @ns: namespace |
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* @shp: struct to free * |
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* It has to be called with shp and shm_ids.rwsem (writer) 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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struct file *shm_file; shm_file = shp->shm_file; shp->shm_file = NULL; |
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ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
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shm_rmid(ns, shp); |
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shm_unlock(shp); |
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if (!is_file_hugepages(shm_file)) shmem_lock(shm_file, 0, shp->mlock_user); |
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else if (shp->mlock_user) |
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user_shm_unlock(file_inode(shm_file)->i_size, shp->mlock_user); fput(shm_file); |
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ipc_rcu_putref(shp, shm_rcu_free); |
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} /* |
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* shm_may_destroy - identifies whether shm segment should be destroyed now * * Returns true if and only if there are no active users of the segment and * one of the following is true: * * 1) shmctl(id, IPC_RMID, NULL) was called for this shp * * 2) sysctl kernel.shm_rmid_forced is set to 1. */ static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) { return (shp->shm_nattch == 0) && (ns->shm_rmid_forced || (shp->shm_perm.mode & SHM_DEST)); } /* |
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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; |
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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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|
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down_write(&shm_ids(ns).rwsem); |
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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(IS_ERR(shp)); |
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shp->shm_lprid = task_tgid_vnr(current); |
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shp->shm_dtim = get_seconds(); shp->shm_nattch--; |
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if (shm_may_destroy(ns, shp)) shm_destroy(ns, shp); else shm_unlock(shp); |
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up_write(&shm_ids(ns).rwsem); |
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} |
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/* Called with ns->shm_ids(ns).rwsem locked */ |
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static int shm_try_destroy_orphaned(int id, void *p, void *data) { struct ipc_namespace *ns = data; |
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struct kern_ipc_perm *ipcp = p; struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
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/* * We want to destroy segments without users and with already * exit'ed originating process. |
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* |
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* As shp->* are changed under rwsem, it's safe to skip shp locking. |
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*/ |
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if (shp->shm_creator != NULL) |
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return 0; |
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|
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if (shm_may_destroy(ns, shp)) { shm_lock_by_ptr(shp); |
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shm_destroy(ns, shp); |
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} |
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return 0; } void shm_destroy_orphaned(struct ipc_namespace *ns) { |
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down_write(&shm_ids(ns).rwsem); |
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if (shm_ids(ns).in_use) |
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idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns); |
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up_write(&shm_ids(ns).rwsem); |
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} |
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/* Locking assumes this will only be called with task == current */ |
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void exit_shm(struct task_struct *task) { |
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struct ipc_namespace *ns = task->nsproxy->ipc_ns; |
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struct shmid_kernel *shp, *n; |
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|
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if (list_empty(&task->sysvshm.shm_clist)) return; /* * If kernel.shm_rmid_forced is not set then only keep track of * which shmids are orphaned, so that a later set of the sysctl * can clean them up. */ if (!ns->shm_rmid_forced) { down_read(&shm_ids(ns).rwsem); list_for_each_entry(shp, &task->sysvshm.shm_clist, shm_clist) shp->shm_creator = NULL; /* * Only under read lock but we are only called on current * so no entry on the list will be shared. */ list_del(&task->sysvshm.shm_clist); up_read(&shm_ids(ns).rwsem); |
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return; |
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} |
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|
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/* * Destroy all already created segments, that were not yet mapped, * and mark any mapped as orphan to cover the sysctl toggling. * Destroy is skipped if shm_may_destroy() returns false. */ |
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down_write(&shm_ids(ns).rwsem); |
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list_for_each_entry_safe(shp, n, &task->sysvshm.shm_clist, shm_clist) { shp->shm_creator = NULL; if (shm_may_destroy(ns, shp)) { shm_lock_by_ptr(shp); shm_destroy(ns, shp); } } /* Remove the list head from any segments still attached. */ |
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list_del(&task->sysvshm.shm_clist); |
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up_write(&shm_ids(ns).rwsem); |
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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 |
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static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) |
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{ 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; } |
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static struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) |
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{ 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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|
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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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{ |
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struct shm_file_data *sfd = shm_file_data(file); |
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365 |
int ret; |
bc56bba8f [PATCH] shm: make... |
366 367 368 369 |
ret = sfd->file->f_op->mmap(sfd->file, vma); if (ret != 0) return ret; sfd->vm_ops = vma->vm_ops; |
2e92a3bae NOMMU: Fix SYSV I... |
370 |
#ifdef CONFIG_MMU |
54cb8821d mm: merge populat... |
371 |
BUG_ON(!sfd->vm_ops->fault); |
2e92a3bae NOMMU: Fix SYSV I... |
372 |
#endif |
bc56bba8f [PATCH] shm: make... |
373 374 |
vma->vm_ops = &shm_vm_ops; shm_open(vma); |
b0e15190e [PATCH] NOMMU: Ma... |
375 376 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
377 |
} |
4e9823111 [PATCH] IPC names... |
378 379 |
static int shm_release(struct inode *ino, struct file *file) { |
bc56bba8f [PATCH] shm: make... |
380 |
struct shm_file_data *sfd = shm_file_data(file); |
4e9823111 [PATCH] IPC names... |
381 |
|
bc56bba8f [PATCH] shm: make... |
382 383 384 |
put_ipc_ns(sfd->ns); shm_file_data(file) = NULL; kfree(sfd); |
4e9823111 [PATCH] IPC names... |
385 386 |
return 0; } |
02c24a821 fs: push i_mutex ... |
387 |
static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
516dffdcd [PATCH] Fix get_u... |
388 |
{ |
516dffdcd [PATCH] Fix get_u... |
389 |
struct shm_file_data *sfd = shm_file_data(file); |
516dffdcd [PATCH] Fix get_u... |
390 |
|
7ea808591 drop unused dentr... |
391 392 |
if (!sfd->file->f_op->fsync) return -EINVAL; |
02c24a821 fs: push i_mutex ... |
393 |
return sfd->file->f_op->fsync(sfd->file, start, end, datasync); |
516dffdcd [PATCH] Fix get_u... |
394 |
} |
7d8a45695 ipc: shm: restore... |
395 396 397 398 399 400 401 402 403 |
static long shm_fallocate(struct file *file, int mode, loff_t offset, loff_t len) { struct shm_file_data *sfd = shm_file_data(file); if (!sfd->file->f_op->fallocate) return -EOPNOTSUPP; return sfd->file->f_op->fallocate(file, mode, offset, len); } |
bc56bba8f [PATCH] shm: make... |
404 405 406 407 408 |
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); |
c4caa7781 file ->get_unmapp... |
409 410 |
return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len, pgoff, flags); |
bc56bba8f [PATCH] shm: make... |
411 |
} |
bc56bba8f [PATCH] shm: make... |
412 |
|
9a32144e9 [PATCH] mark stru... |
413 |
static const struct file_operations shm_file_operations = { |
4e9823111 [PATCH] IPC names... |
414 |
.mmap = shm_mmap, |
516dffdcd [PATCH] Fix get_u... |
415 |
.fsync = shm_fsync, |
4e9823111 [PATCH] IPC names... |
416 |
.release = shm_release, |
ed5e5894b nommu: fix SYSV S... |
417 418 419 |
#ifndef CONFIG_MMU .get_unmapped_area = shm_get_unmapped_area, #endif |
6038f373a llseek: automatic... |
420 |
.llseek = noop_llseek, |
7d8a45695 ipc: shm: restore... |
421 |
.fallocate = shm_fallocate, |
c4caa7781 file ->get_unmapp... |
422 423 424 425 426 427 |
}; static const struct file_operations shm_file_operations_huge = { .mmap = shm_mmap, .fsync = shm_fsync, .release = shm_release, |
bc56bba8f [PATCH] shm: make... |
428 |
.get_unmapped_area = shm_get_unmapped_area, |
6038f373a llseek: automatic... |
429 |
.llseek = noop_llseek, |
7d8a45695 ipc: shm: restore... |
430 |
.fallocate = shm_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
431 |
}; |
c4caa7781 file ->get_unmapp... |
432 433 434 435 |
int is_file_shm_hugepages(struct file *file) { return file->f_op == &shm_file_operations_huge; } |
f0f37e2f7 const: mark struc... |
436 |
static const struct vm_operations_struct shm_vm_ops = { |
1da177e4c Linux-2.6.12-rc2 |
437 438 |
.open = shm_open, /* callback for a new vm-area open */ .close = shm_close, /* callback for when the vm-area is released */ |
54cb8821d mm: merge populat... |
439 |
.fault = shm_fault, |
bc56bba8f [PATCH] shm: make... |
440 441 442 |
#if defined(CONFIG_NUMA) .set_policy = shm_set_policy, .get_policy = shm_get_policy, |
1da177e4c Linux-2.6.12-rc2 |
443 444 |
#endif }; |
f4566f048 ipc: fix wrong co... |
445 446 447 448 449 |
/** * newseg - Create a new shared memory segment * @ns: namespace * @params: ptr to the structure that contains key, size and shmflg * |
d9a605e40 ipc: rename ids->... |
450 |
* Called with shm_ids.rwsem held as a writer. |
f4566f048 ipc: fix wrong co... |
451 |
*/ |
7748dbfaa ipc: unify the sy... |
452 |
static int newseg(struct ipc_namespace *ns, struct ipc_params *params) |
1da177e4c Linux-2.6.12-rc2 |
453 |
{ |
7748dbfaa ipc: unify the sy... |
454 455 456 |
key_t key = params->key; int shmflg = params->flg; size_t size = params->u.size; |
1da177e4c Linux-2.6.12-rc2 |
457 458 |
int error; struct shmid_kernel *shp; |
d69f3bad4 ipc: sysv shared ... |
459 |
size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
239521f31 ipc: whitespace c... |
460 |
struct file *file; |
1da177e4c Linux-2.6.12-rc2 |
461 462 |
char name[13]; int id; |
ca16d140a mm: don't access ... |
463 |
vm_flags_t acctflag = 0; |
1da177e4c Linux-2.6.12-rc2 |
464 |
|
4e9823111 [PATCH] IPC names... |
465 |
if (size < SHMMIN || size > ns->shm_ctlmax) |
1da177e4c Linux-2.6.12-rc2 |
466 |
return -EINVAL; |
1376327ce ipc/shm.c: check ... |
467 468 |
if (numpages << PAGE_SHIFT < size) return -ENOSPC; |
09c6eb1f6 ipc/shm.c: check ... |
469 470 |
if (ns->shm_tot + numpages < ns->shm_tot || ns->shm_tot + numpages > ns->shm_ctlall) |
1da177e4c Linux-2.6.12-rc2 |
471 472 473 474 475 476 477 |
return -ENOSPC; shp = ipc_rcu_alloc(sizeof(*shp)); if (!shp) return -ENOMEM; shp->shm_perm.key = key; |
b33291c0b [PATCH] ipc: expa... |
478 |
shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
1da177e4c Linux-2.6.12-rc2 |
479 480 481 482 483 |
shp->mlock_user = NULL; shp->shm_perm.security = NULL; error = security_shm_alloc(shp); if (error) { |
53dad6d3a ipc: fix race wit... |
484 |
ipc_rcu_putref(shp, ipc_rcu_free); |
1da177e4c Linux-2.6.12-rc2 |
485 486 |
return error; } |
239521f31 ipc: whitespace c... |
487 |
sprintf(name, "SYSV%08x", key); |
1da177e4c Linux-2.6.12-rc2 |
488 |
if (shmflg & SHM_HUGETLB) { |
c103a4dc4 ipc/shmc.c: elimi... |
489 |
struct hstate *hs; |
091d0d55b shm: fix null poi... |
490 |
size_t hugesize; |
c103a4dc4 ipc/shmc.c: elimi... |
491 |
hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); |
091d0d55b shm: fix null poi... |
492 493 494 495 496 |
if (!hs) { error = -EINVAL; goto no_file; } hugesize = ALIGN(size, huge_page_size(hs)); |
af73e4d95 hugetlbfs: fix mm... |
497 |
|
5a6fe1259 Do not account fo... |
498 499 500 |
/* hugetlb_file_setup applies strict accounting */ if (shmflg & SHM_NORESERVE) acctflag = VM_NORESERVE; |
af73e4d95 hugetlbfs: fix mm... |
501 |
file = hugetlb_file_setup(name, hugesize, acctflag, |
42d7395fe mm: support more ... |
502 503 |
&shp->mlock_user, HUGETLB_SHMFS_INODE, (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); |
1da177e4c Linux-2.6.12-rc2 |
504 |
} else { |
bf8f972d3 [PATCH] SHM_NORES... |
505 506 |
/* * Do not allow no accounting for OVERCOMMIT_NEVER, even |
239521f31 ipc: whitespace c... |
507 |
* if it's asked for. |
bf8f972d3 [PATCH] SHM_NORES... |
508 509 510 |
*/ if ((shmflg & SHM_NORESERVE) && sysctl_overcommit_memory != OVERCOMMIT_NEVER) |
fc8744adc Stop playing sill... |
511 |
acctflag = VM_NORESERVE; |
bf8f972d3 [PATCH] SHM_NORES... |
512 |
file = shmem_file_setup(name, size, acctflag); |
1da177e4c Linux-2.6.12-rc2 |
513 514 515 516 |
} error = PTR_ERR(file); if (IS_ERR(file)) goto no_file; |
48dea404e IPC: use ipc_buil... |
517 |
id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
283bb7fad IPC: fix error ca... |
518 519 |
if (id < 0) { error = id; |
1da177e4c Linux-2.6.12-rc2 |
520 |
goto no_id; |
283bb7fad IPC: fix error ca... |
521 |
} |
1da177e4c Linux-2.6.12-rc2 |
522 |
|
b488893a3 pid namespaces: c... |
523 |
shp->shm_cprid = task_tgid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
524 525 526 527 528 |
shp->shm_lprid = 0; shp->shm_atim = shp->shm_dtim = 0; shp->shm_ctim = get_seconds(); shp->shm_segsz = size; shp->shm_nattch = 0; |
1da177e4c Linux-2.6.12-rc2 |
529 |
shp->shm_file = file; |
5774ed014 shm: handle separ... |
530 |
shp->shm_creator = current; |
ab602f799 shm: make exit_sh... |
531 |
list_add(&shp->shm_clist, ¤t->sysvshm.shm_clist); |
dbfcd91f0 ipc: move rcu loc... |
532 |
|
30475cc12 Restore shmid as ... |
533 534 535 536 |
/* * shmid gets reported as "inode#" in /proc/pid/maps. * proc-ps tools use this. Changing this will break them. */ |
496ad9aa8 new helper: file_... |
537 |
file_inode(file)->i_ino = shp->shm_perm.id; |
551110a94 [PATCH] hugetlb: ... |
538 |
|
4e9823111 [PATCH] IPC names... |
539 |
ns->shm_tot += numpages; |
7ca7e564e ipc: store ipcs i... |
540 |
error = shp->shm_perm.id; |
dbfcd91f0 ipc: move rcu loc... |
541 |
|
cf9d5d78d ipc: close open c... |
542 |
ipc_unlock_object(&shp->shm_perm); |
dbfcd91f0 ipc: move rcu loc... |
543 |
rcu_read_unlock(); |
7ca7e564e ipc: store ipcs i... |
544 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
545 546 |
no_id: |
2195d2818 fix undefined ref... |
547 |
if (is_file_hugepages(file) && shp->mlock_user) |
353d5c30c mm: fix hugetlb b... |
548 |
user_shm_unlock(size, shp->mlock_user); |
1da177e4c Linux-2.6.12-rc2 |
549 550 |
fput(file); no_file: |
53dad6d3a ipc: fix race wit... |
551 |
ipc_rcu_putref(shp, shm_rcu_free); |
1da177e4c Linux-2.6.12-rc2 |
552 553 |
return error; } |
f4566f048 ipc: fix wrong co... |
554 |
/* |
d9a605e40 ipc: rename ids->... |
555 |
* Called with shm_ids.rwsem and ipcp locked. |
f4566f048 ipc: fix wrong co... |
556 |
*/ |
03f02c765 Storing ipcs into... |
557 |
static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg) |
7748dbfaa ipc: unify the sy... |
558 |
{ |
03f02c765 Storing ipcs into... |
559 560 561 562 |
struct shmid_kernel *shp; shp = container_of(ipcp, struct shmid_kernel, shm_perm); return security_shm_associate(shp, shmflg); |
7748dbfaa ipc: unify the sy... |
563 |
} |
f4566f048 ipc: fix wrong co... |
564 |
/* |
d9a605e40 ipc: rename ids->... |
565 |
* Called with shm_ids.rwsem and ipcp locked. |
f4566f048 ipc: fix wrong co... |
566 |
*/ |
03f02c765 Storing ipcs into... |
567 568 |
static inline int shm_more_checks(struct kern_ipc_perm *ipcp, struct ipc_params *params) |
7748dbfaa ipc: unify the sy... |
569 |
{ |
03f02c765 Storing ipcs into... |
570 571 572 573 |
struct shmid_kernel *shp; shp = container_of(ipcp, struct shmid_kernel, shm_perm); if (shp->shm_segsz < params->u.size) |
7748dbfaa ipc: unify the sy... |
574 575 576 577 |
return -EINVAL; return 0; } |
d5460c997 [CVE-2009-0029] S... |
578 |
SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg) |
1da177e4c Linux-2.6.12-rc2 |
579 |
{ |
4e9823111 [PATCH] IPC names... |
580 |
struct ipc_namespace *ns; |
eb66ec44f ipc: constify ipc... |
581 582 583 584 585 |
static const struct ipc_ops shm_ops = { .getnew = newseg, .associate = shm_security, .more_checks = shm_more_checks, }; |
7748dbfaa ipc: unify the sy... |
586 |
struct ipc_params shm_params; |
4e9823111 [PATCH] IPC names... |
587 588 |
ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
589 |
|
7748dbfaa ipc: unify the sy... |
590 591 592 |
shm_params.key = key; shm_params.flg = shmflg; shm_params.u.size = size; |
1da177e4c Linux-2.6.12-rc2 |
593 |
|
7748dbfaa ipc: unify the sy... |
594 |
return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params); |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 598 |
} static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) { |
239521f31 ipc: whitespace c... |
599 |
switch (version) { |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 603 604 |
case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shmid_ds out; |
3af54c9bd ipc: shm: fix inf... |
605 |
memset(&out, 0, sizeof(out)); |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
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; } } |
016d7132f IPC: get rid of t... |
621 622 |
static inline unsigned long copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version) |
1da177e4c Linux-2.6.12-rc2 |
623 |
{ |
239521f31 ipc: whitespace c... |
624 |
switch (version) { |
1da177e4c Linux-2.6.12-rc2 |
625 |
case IPC_64: |
016d7132f IPC: get rid of t... |
626 |
if (copy_from_user(out, buf, sizeof(*out))) |
1da177e4c Linux-2.6.12-rc2 |
627 |
return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
628 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 633 634 |
case IPC_OLD: { struct shmid_ds tbuf_old; if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) return -EFAULT; |
016d7132f IPC: get rid of t... |
635 636 637 |
out->shm_perm.uid = tbuf_old.shm_perm.uid; out->shm_perm.gid = tbuf_old.shm_perm.gid; out->shm_perm.mode = tbuf_old.shm_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 |
return 0; } default: return -EINVAL; } } static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) { |
239521f31 ipc: whitespace c... |
648 |
switch (version) { |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 |
case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shminfo out; |
239521f31 ipc: whitespace c... |
654 |
if (in->shmmax > INT_MAX) |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 661 |
out.shmmax = INT_MAX; else out.shmmax = (int)in->shmmax; out.shmmin = in->shmmin; out.shmmni = in->shmmni; out.shmseg = in->shmseg; |
46c0a8ca3 ipc, kernel: clea... |
662 |
out.shmall = in->shmall; |
1da177e4c Linux-2.6.12-rc2 |
663 664 665 666 667 668 669 |
return copy_to_user(buf, &out, sizeof(out)); } default: return -EINVAL; } } |
f4566f048 ipc: fix wrong co... |
670 |
/* |
b79521807 ipc/shm.c: add RS... |
671 |
* Calculate and add used RSS and swap pages of a shm. |
d9a605e40 ipc: rename ids->... |
672 |
* Called with shm_ids.rwsem held as a reader |
b79521807 ipc/shm.c: add RS... |
673 674 675 676 677 |
*/ static void shm_add_rss_swap(struct shmid_kernel *shp, unsigned long *rss_add, unsigned long *swp_add) { struct inode *inode; |
496ad9aa8 new helper: file_... |
678 |
inode = file_inode(shp->shm_file); |
b79521807 ipc/shm.c: add RS... |
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 |
if (is_file_hugepages(shp->shm_file)) { struct address_space *mapping = inode->i_mapping; struct hstate *h = hstate_file(shp->shm_file); *rss_add += pages_per_huge_page(h) * mapping->nrpages; } else { #ifdef CONFIG_SHMEM struct shmem_inode_info *info = SHMEM_I(inode); spin_lock(&info->lock); *rss_add += inode->i_mapping->nrpages; *swp_add += info->swapped; spin_unlock(&info->lock); #else *rss_add += inode->i_mapping->nrpages; #endif } } /* |
d9a605e40 ipc: rename ids->... |
698 |
* Called with shm_ids.rwsem held as a reader |
f4566f048 ipc: fix wrong co... |
699 |
*/ |
4e9823111 [PATCH] IPC names... |
700 701 |
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, unsigned long *swp) |
1da177e4c Linux-2.6.12-rc2 |
702 |
{ |
7ca7e564e ipc: store ipcs i... |
703 704 |
int next_id; int total, in_use; |
1da177e4c Linux-2.6.12-rc2 |
705 706 707 |
*rss = 0; *swp = 0; |
7ca7e564e ipc: store ipcs i... |
708 709 710 |
in_use = shm_ids(ns).in_use; for (total = 0, next_id = 0; total < in_use; next_id++) { |
e562aebc6 ipc: make shm_get... |
711 |
struct kern_ipc_perm *ipc; |
1da177e4c Linux-2.6.12-rc2 |
712 |
struct shmid_kernel *shp; |
1da177e4c Linux-2.6.12-rc2 |
713 |
|
e562aebc6 ipc: make shm_get... |
714 715 |
ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id); if (ipc == NULL) |
1da177e4c Linux-2.6.12-rc2 |
716 |
continue; |
e562aebc6 ipc: make shm_get... |
717 |
shp = container_of(ipc, struct shmid_kernel, shm_perm); |
1da177e4c Linux-2.6.12-rc2 |
718 |
|
b79521807 ipc/shm.c: add RS... |
719 |
shm_add_rss_swap(shp, rss, swp); |
7ca7e564e ipc: store ipcs i... |
720 721 |
total++; |
1da177e4c Linux-2.6.12-rc2 |
722 723 |
} } |
8d4cc8b5c IPC/shared memory... |
724 |
/* |
d9a605e40 ipc: rename ids->... |
725 |
* This function handles some shmctl commands which require the rwsem |
8d4cc8b5c IPC/shared memory... |
726 |
* to be held in write mode. |
d9a605e40 ipc: rename ids->... |
727 |
* NOTE: no locks must be held, the rwsem is taken inside this function. |
8d4cc8b5c IPC/shared memory... |
728 729 730 |
*/ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd, struct shmid_ds __user *buf, int version) |
1da177e4c Linux-2.6.12-rc2 |
731 |
{ |
8d4cc8b5c IPC/shared memory... |
732 |
struct kern_ipc_perm *ipcp; |
016d7132f IPC: get rid of t... |
733 |
struct shmid64_ds shmid64; |
1da177e4c Linux-2.6.12-rc2 |
734 |
struct shmid_kernel *shp; |
8d4cc8b5c IPC/shared memory... |
735 736 737 |
int err; if (cmd == IPC_SET) { |
016d7132f IPC: get rid of t... |
738 |
if (copy_shmid_from_user(&shmid64, buf, version)) |
8d4cc8b5c IPC/shared memory... |
739 740 |
return -EFAULT; } |
d9a605e40 ipc: rename ids->... |
741 |
down_write(&shm_ids(ns).rwsem); |
7b4cc5d84 ipc: move locking... |
742 |
rcu_read_lock(); |
79ccf0f8c ipc,shm: shorten ... |
743 744 |
ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd, &shmid64.shm_perm, 0); |
7b4cc5d84 ipc: move locking... |
745 746 |
if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); |
7b4cc5d84 ipc: move locking... |
747 748 |
goto out_unlock1; } |
8d4cc8b5c IPC/shared memory... |
749 |
|
a5f75e7f2 IPC: consolidate ... |
750 |
shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
8d4cc8b5c IPC/shared memory... |
751 752 753 |
err = security_shm_shmctl(shp, cmd); if (err) |
79ccf0f8c ipc,shm: shorten ... |
754 |
goto out_unlock1; |
7b4cc5d84 ipc: move locking... |
755 |
|
8d4cc8b5c IPC/shared memory... |
756 757 |
switch (cmd) { case IPC_RMID: |
79ccf0f8c ipc,shm: shorten ... |
758 |
ipc_lock_object(&shp->shm_perm); |
7b4cc5d84 ipc: move locking... |
759 |
/* do_shm_rmid unlocks the ipc object and rcu */ |
8d4cc8b5c IPC/shared memory... |
760 761 762 |
do_shm_rmid(ns, ipcp); goto out_up; case IPC_SET: |
79ccf0f8c ipc,shm: shorten ... |
763 |
ipc_lock_object(&shp->shm_perm); |
1efdb69b0 userns: Convert i... |
764 765 |
err = ipc_update_perm(&shmid64.shm_perm, ipcp); if (err) |
7b4cc5d84 ipc: move locking... |
766 |
goto out_unlock0; |
8d4cc8b5c IPC/shared memory... |
767 768 769 770 |
shp->shm_ctim = get_seconds(); break; default: err = -EINVAL; |
79ccf0f8c ipc,shm: shorten ... |
771 |
goto out_unlock1; |
8d4cc8b5c IPC/shared memory... |
772 |
} |
7b4cc5d84 ipc: move locking... |
773 774 775 776 777 |
out_unlock0: ipc_unlock_object(&shp->shm_perm); out_unlock1: rcu_read_unlock(); |
8d4cc8b5c IPC/shared memory... |
778 |
out_up: |
d9a605e40 ipc: rename ids->... |
779 |
up_write(&shm_ids(ns).rwsem); |
8d4cc8b5c IPC/shared memory... |
780 781 |
return err; } |
68eccc1dc ipc,shm: introduc... |
782 783 |
static int shmctl_nolock(struct ipc_namespace *ns, int shmid, int cmd, int version, void __user *buf) |
8d4cc8b5c IPC/shared memory... |
784 |
{ |
68eccc1dc ipc,shm: introduc... |
785 |
int err; |
8d4cc8b5c IPC/shared memory... |
786 |
struct shmid_kernel *shp; |
1da177e4c Linux-2.6.12-rc2 |
787 |
|
68eccc1dc ipc,shm: introduc... |
788 789 790 791 792 |
/* preliminary security checks for *_INFO */ if (cmd == IPC_INFO || cmd == SHM_INFO) { err = security_shm_shmctl(NULL, cmd); if (err) return err; |
1da177e4c Linux-2.6.12-rc2 |
793 |
} |
68eccc1dc ipc,shm: introduc... |
794 |
switch (cmd) { |
1da177e4c Linux-2.6.12-rc2 |
795 796 797 |
case IPC_INFO: { struct shminfo64 shminfo; |
e8148f758 ipc: clean up ipc... |
798 |
memset(&shminfo, 0, sizeof(shminfo)); |
4e9823111 [PATCH] IPC names... |
799 800 801 |
shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; shminfo.shmmax = ns->shm_ctlmax; shminfo.shmall = ns->shm_ctlall; |
1da177e4c Linux-2.6.12-rc2 |
802 803 |
shminfo.shmmin = SHMMIN; |
239521f31 ipc: whitespace c... |
804 |
if (copy_shminfo_to_user(buf, &shminfo, version)) |
1da177e4c Linux-2.6.12-rc2 |
805 |
return -EFAULT; |
f4566f048 ipc: fix wrong co... |
806 |
|
d9a605e40 ipc: rename ids->... |
807 |
down_read(&shm_ids(ns).rwsem); |
7ca7e564e ipc: store ipcs i... |
808 |
err = ipc_get_maxid(&shm_ids(ns)); |
d9a605e40 ipc: rename ids->... |
809 |
up_read(&shm_ids(ns).rwsem); |
f4566f048 ipc: fix wrong co... |
810 |
|
239521f31 ipc: whitespace c... |
811 |
if (err < 0) |
1da177e4c Linux-2.6.12-rc2 |
812 813 814 815 816 817 |
err = 0; goto out; } case SHM_INFO: { struct shm_info shm_info; |
e8148f758 ipc: clean up ipc... |
818 |
memset(&shm_info, 0, sizeof(shm_info)); |
d9a605e40 ipc: rename ids->... |
819 |
down_read(&shm_ids(ns).rwsem); |
4e9823111 [PATCH] IPC names... |
820 |
shm_info.used_ids = shm_ids(ns).in_use; |
239521f31 ipc: whitespace c... |
821 |
shm_get_stat(ns, &shm_info.shm_rss, &shm_info.shm_swp); |
4e9823111 [PATCH] IPC names... |
822 |
shm_info.shm_tot = ns->shm_tot; |
1da177e4c Linux-2.6.12-rc2 |
823 824 |
shm_info.swap_attempts = 0; shm_info.swap_successes = 0; |
7ca7e564e ipc: store ipcs i... |
825 |
err = ipc_get_maxid(&shm_ids(ns)); |
d9a605e40 ipc: rename ids->... |
826 |
up_read(&shm_ids(ns).rwsem); |
e8148f758 ipc: clean up ipc... |
827 |
if (copy_to_user(buf, &shm_info, sizeof(shm_info))) { |
1da177e4c Linux-2.6.12-rc2 |
828 829 830 831 832 833 834 835 836 837 838 839 |
err = -EFAULT; goto out; } err = err < 0 ? 0 : err; goto out; } case SHM_STAT: case IPC_STAT: { struct shmid64_ds tbuf; int result; |
023a53557 ipc: integrate ip... |
840 |
|
c97cb9cca ipc,shm: make shm... |
841 |
rcu_read_lock(); |
023a53557 ipc: integrate ip... |
842 |
if (cmd == SHM_STAT) { |
c97cb9cca ipc,shm: make shm... |
843 |
shp = shm_obtain_object(ns, shmid); |
023a53557 ipc: integrate ip... |
844 845 |
if (IS_ERR(shp)) { err = PTR_ERR(shp); |
c97cb9cca ipc,shm: make shm... |
846 |
goto out_unlock; |
023a53557 ipc: integrate ip... |
847 |
} |
7ca7e564e ipc: store ipcs i... |
848 |
result = shp->shm_perm.id; |
1da177e4c Linux-2.6.12-rc2 |
849 |
} else { |
c97cb9cca ipc,shm: make shm... |
850 |
shp = shm_obtain_object_check(ns, shmid); |
023a53557 ipc: integrate ip... |
851 852 |
if (IS_ERR(shp)) { err = PTR_ERR(shp); |
c97cb9cca ipc,shm: make shm... |
853 |
goto out_unlock; |
023a53557 ipc: integrate ip... |
854 |
} |
1da177e4c Linux-2.6.12-rc2 |
855 856 |
result = 0; } |
c97cb9cca ipc,shm: make shm... |
857 |
|
e8148f758 ipc: clean up ipc... |
858 |
err = -EACCES; |
b0e77598f userns: user name... |
859 |
if (ipcperms(ns, &shp->shm_perm, S_IRUGO)) |
1da177e4c Linux-2.6.12-rc2 |
860 |
goto out_unlock; |
c97cb9cca ipc,shm: make shm... |
861 |
|
1da177e4c Linux-2.6.12-rc2 |
862 863 864 |
err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock; |
c97cb9cca ipc,shm: make shm... |
865 |
|
023a53557 ipc: integrate ip... |
866 |
memset(&tbuf, 0, sizeof(tbuf)); |
1da177e4c Linux-2.6.12-rc2 |
867 868 869 870 871 872 873 |
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... |
874 |
tbuf.shm_nattch = shp->shm_nattch; |
c97cb9cca ipc,shm: make shm... |
875 876 877 |
rcu_read_unlock(); if (copy_shmid_to_user(buf, &tbuf, version)) |
1da177e4c Linux-2.6.12-rc2 |
878 879 880 881 882 |
err = -EFAULT; else err = result; goto out; } |
68eccc1dc ipc,shm: introduc... |
883 884 885 886 887 |
default: return -EINVAL; } out_unlock: |
c97cb9cca ipc,shm: make shm... |
888 |
rcu_read_unlock(); |
68eccc1dc ipc,shm: introduc... |
889 890 891 892 893 894 895 896 897 |
out: return err; } SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) { struct shmid_kernel *shp; int err, version; struct ipc_namespace *ns; |
2caacaa82 ipc,shm: shorten ... |
898 899 |
if (cmd < 0 || shmid < 0) return -EINVAL; |
68eccc1dc ipc,shm: introduc... |
900 901 902 903 904 905 906 907 908 909 |
version = ipc_parse_version(&cmd); ns = current->nsproxy->ipc_ns; switch (cmd) { case IPC_INFO: case SHM_INFO: case SHM_STAT: case IPC_STAT: return shmctl_nolock(ns, shmid, cmd, version, buf); |
2caacaa82 ipc,shm: shorten ... |
910 911 912 |
case IPC_RMID: case IPC_SET: return shmctl_down(ns, shmid, cmd, buf, version); |
1da177e4c Linux-2.6.12-rc2 |
913 914 915 |
case SHM_LOCK: case SHM_UNLOCK: { |
85046579b SHM_UNLOCK: fix l... |
916 |
struct file *shm_file; |
89e004ea5 SHM_LOCKED pages ... |
917 |
|
2caacaa82 ipc,shm: shorten ... |
918 919 |
rcu_read_lock(); shp = shm_obtain_object_check(ns, shmid); |
023a53557 ipc: integrate ip... |
920 921 |
if (IS_ERR(shp)) { err = PTR_ERR(shp); |
2caacaa82 ipc,shm: shorten ... |
922 |
goto out_unlock1; |
1da177e4c Linux-2.6.12-rc2 |
923 |
} |
1da177e4c Linux-2.6.12-rc2 |
924 |
|
a33e67510 sanitize audit_ip... |
925 |
audit_ipc_obj(&(shp->shm_perm)); |
2caacaa82 ipc,shm: shorten ... |
926 927 928 |
err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock1; |
073115d6b [PATCH] Rework of... |
929 |
|
2caacaa82 ipc,shm: shorten ... |
930 |
ipc_lock_object(&shp->shm_perm); |
0f3d2b013 ipc: introduce ip... |
931 932 933 934 935 936 |
/* check if shm_destroy() is tearing down shp */ if (!ipc_valid_object(&shp->shm_perm)) { err = -EIDRM; goto out_unlock0; } |
b0e77598f userns: user name... |
937 |
if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) { |
1efdb69b0 userns: Convert i... |
938 |
kuid_t euid = current_euid(); |
1efdb69b0 userns: Convert i... |
939 |
if (!uid_eq(euid, shp->shm_perm.uid) && |
3a72660b0 ipc,shm: correct ... |
940 941 |
!uid_eq(euid, shp->shm_perm.cuid)) { err = -EPERM; |
2caacaa82 ipc,shm: shorten ... |
942 |
goto out_unlock0; |
3a72660b0 ipc,shm: correct ... |
943 944 945 |
} if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) { err = -EPERM; |
2caacaa82 ipc,shm: shorten ... |
946 |
goto out_unlock0; |
3a72660b0 ipc,shm: correct ... |
947 |
} |
1da177e4c Linux-2.6.12-rc2 |
948 |
} |
85046579b SHM_UNLOCK: fix l... |
949 950 |
shm_file = shp->shm_file; if (is_file_hugepages(shm_file)) |
2caacaa82 ipc,shm: shorten ... |
951 |
goto out_unlock0; |
85046579b SHM_UNLOCK: fix l... |
952 953 |
if (cmd == SHM_LOCK) { |
86a264abe CRED: Wrap curren... |
954 |
struct user_struct *user = current_user(); |
85046579b SHM_UNLOCK: fix l... |
955 956 957 958 |
err = shmem_lock(shm_file, 1, user); if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) { shp->shm_perm.mode |= SHM_LOCKED; shp->mlock_user = user; |
1da177e4c Linux-2.6.12-rc2 |
959 |
} |
2caacaa82 ipc,shm: shorten ... |
960 |
goto out_unlock0; |
1da177e4c Linux-2.6.12-rc2 |
961 |
} |
85046579b SHM_UNLOCK: fix l... |
962 963 964 |
/* SHM_UNLOCK */ if (!(shp->shm_perm.mode & SHM_LOCKED)) |
2caacaa82 ipc,shm: shorten ... |
965 |
goto out_unlock0; |
85046579b SHM_UNLOCK: fix l... |
966 967 968 969 |
shmem_lock(shm_file, 0, shp->mlock_user); shp->shm_perm.mode &= ~SHM_LOCKED; shp->mlock_user = NULL; get_file(shm_file); |
2caacaa82 ipc,shm: shorten ... |
970 971 |
ipc_unlock_object(&shp->shm_perm); rcu_read_unlock(); |
245132643 SHM_UNLOCK: fix U... |
972 |
shmem_unlock_mapping(shm_file->f_mapping); |
2caacaa82 ipc,shm: shorten ... |
973 |
|
85046579b SHM_UNLOCK: fix l... |
974 |
fput(shm_file); |
8d4cc8b5c IPC/shared memory... |
975 |
return err; |
2caacaa82 ipc,shm: shorten ... |
976 |
} |
1da177e4c Linux-2.6.12-rc2 |
977 |
default: |
8d4cc8b5c IPC/shared memory... |
978 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
979 |
} |
2caacaa82 ipc,shm: shorten ... |
980 981 982 983 |
out_unlock0: ipc_unlock_object(&shp->shm_perm); out_unlock1: rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
984 985 986 987 988 989 990 991 992 993 |
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. */ |
079a96ae3 ipc: add COMPAT_S... |
994 995 |
long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr, unsigned long shmlba) |
1da177e4c Linux-2.6.12-rc2 |
996 997 998 999 |
{ struct shmid_kernel *shp; unsigned long addr; unsigned long size; |
239521f31 ipc: whitespace c... |
1000 |
struct file *file; |
1da177e4c Linux-2.6.12-rc2 |
1001 1002 1003 |
int err; unsigned long flags; unsigned long prot; |
1da177e4c Linux-2.6.12-rc2 |
1004 |
int acc_mode; |
4e9823111 [PATCH] IPC names... |
1005 |
struct ipc_namespace *ns; |
bc56bba8f [PATCH] shm: make... |
1006 1007 |
struct shm_file_data *sfd; struct path path; |
aeb5d7270 [PATCH] introduce... |
1008 |
fmode_t f_mode; |
41badc15c mm: make do_mmap_... |
1009 |
unsigned long populate = 0; |
1da177e4c Linux-2.6.12-rc2 |
1010 |
|
bc56bba8f [PATCH] shm: make... |
1011 1012 |
err = -EINVAL; if (shmid < 0) |
1da177e4c Linux-2.6.12-rc2 |
1013 |
goto out; |
bc56bba8f [PATCH] shm: make... |
1014 |
else if ((addr = (ulong)shmaddr)) { |
079a96ae3 ipc: add COMPAT_S... |
1015 |
if (addr & (shmlba - 1)) { |
1da177e4c Linux-2.6.12-rc2 |
1016 |
if (shmflg & SHM_RND) |
079a96ae3 ipc: add COMPAT_S... |
1017 |
addr &= ~(shmlba - 1); /* round down */ |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 1020 1021 |
else #ifndef __ARCH_FORCE_SHMLBA if (addr & ~PAGE_MASK) #endif |
bc56bba8f [PATCH] shm: make... |
1022 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1023 1024 1025 1026 |
} flags = MAP_SHARED | MAP_FIXED; } else { if ((shmflg & SHM_REMAP)) |
bc56bba8f [PATCH] shm: make... |
1027 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1028 1029 1030 1031 1032 1033 |
flags = MAP_SHARED; } if (shmflg & SHM_RDONLY) { prot = PROT_READ; |
1da177e4c Linux-2.6.12-rc2 |
1034 |
acc_mode = S_IRUGO; |
bc56bba8f [PATCH] shm: make... |
1035 |
f_mode = FMODE_READ; |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 |
} else { prot = PROT_READ | PROT_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
1038 |
acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8f [PATCH] shm: make... |
1039 |
f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
} 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... |
1050 |
ns = current->nsproxy->ipc_ns; |
c2c737a04 ipc,shm: shorten ... |
1051 1052 |
rcu_read_lock(); shp = shm_obtain_object_check(ns, shmid); |
023a53557 ipc: integrate ip... |
1053 1054 |
if (IS_ERR(shp)) { err = PTR_ERR(shp); |
c2c737a04 ipc,shm: shorten ... |
1055 |
goto out_unlock; |
023a53557 ipc: integrate ip... |
1056 |
} |
bc56bba8f [PATCH] shm: make... |
1057 1058 |
err = -EACCES; |
b0e77598f userns: user name... |
1059 |
if (ipcperms(ns, &shp->shm_perm, acc_mode)) |
bc56bba8f [PATCH] shm: make... |
1060 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 |
err = security_shm_shmat(shp, shmaddr, shmflg); |
bc56bba8f [PATCH] shm: make... |
1063 1064 |
if (err) goto out_unlock; |
c2c737a04 ipc,shm: shorten ... |
1065 |
ipc_lock_object(&shp->shm_perm); |
a399b29df ipc,shm: fix shm_... |
1066 1067 |
/* check if shm_destroy() is tearing down shp */ |
0f3d2b013 ipc: introduce ip... |
1068 |
if (!ipc_valid_object(&shp->shm_perm)) { |
a399b29df ipc,shm: fix shm_... |
1069 1070 1071 1072 |
ipc_unlock_object(&shp->shm_perm); err = -EIDRM; goto out_unlock; } |
2c48b9c45 switch alloc_file... |
1073 1074 |
path = shp->shm_file->f_path; path_get(&path); |
1da177e4c Linux-2.6.12-rc2 |
1075 |
shp->shm_nattch++; |
bc56bba8f [PATCH] shm: make... |
1076 |
size = i_size_read(path.dentry->d_inode); |
c2c737a04 ipc,shm: shorten ... |
1077 1078 |
ipc_unlock_object(&shp->shm_perm); rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1079 |
|
bc56bba8f [PATCH] shm: make... |
1080 1081 |
err = -ENOMEM; sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); |
f42569b13 ipc,shm: cleanup ... |
1082 1083 1084 1085 |
if (!sfd) { path_put(&path); goto out_nattch; } |
bc56bba8f [PATCH] shm: make... |
1086 |
|
2c48b9c45 switch alloc_file... |
1087 1088 |
file = alloc_file(&path, f_mode, is_file_hugepages(shp->shm_file) ? |
c4caa7781 file ->get_unmapp... |
1089 1090 |
&shm_file_operations_huge : &shm_file_operations); |
39b652527 fs: Preserve erro... |
1091 |
err = PTR_ERR(file); |
f42569b13 ipc,shm: cleanup ... |
1092 1093 1094 1095 1096 |
if (IS_ERR(file)) { kfree(sfd); path_put(&path); goto out_nattch; } |
bc56bba8f [PATCH] shm: make... |
1097 |
|
bc56bba8f [PATCH] shm: make... |
1098 |
file->private_data = sfd; |
bc56bba8f [PATCH] shm: make... |
1099 |
file->f_mapping = shp->shm_file->f_mapping; |
7ca7e564e ipc: store ipcs i... |
1100 |
sfd->id = shp->shm_perm.id; |
bc56bba8f [PATCH] shm: make... |
1101 1102 1103 |
sfd->ns = get_ipc_ns(ns); sfd->file = shp->shm_file; sfd->vm_ops = NULL; |
8b3ec6814 take security_mma... |
1104 1105 1106 |
err = security_mmap_file(file, prot, flags); if (err) goto out_fput; |
1da177e4c Linux-2.6.12-rc2 |
1107 1108 |
down_write(¤t->mm->mmap_sem); if (addr && !(shmflg & SHM_REMAP)) { |
bc56bba8f [PATCH] shm: make... |
1109 |
err = -EINVAL; |
247a8ce82 ipc/shm.c: check ... |
1110 1111 |
if (addr + size < addr) goto invalid; |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 |
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; } |
f42569b13 ipc,shm: cleanup ... |
1122 |
|
bebeb3d68 mm: introduce mm_... |
1123 1124 |
addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate); *raddr = addr; |
bc56bba8f [PATCH] shm: make... |
1125 |
err = 0; |
bebeb3d68 mm: introduce mm_... |
1126 1127 |
if (IS_ERR_VALUE(addr)) err = (long)addr; |
1da177e4c Linux-2.6.12-rc2 |
1128 1129 |
invalid: up_write(¤t->mm->mmap_sem); |
bebeb3d68 mm: introduce mm_... |
1130 |
if (populate) |
41badc15c mm: make do_mmap_... |
1131 |
mm_populate(addr, populate); |
1da177e4c Linux-2.6.12-rc2 |
1132 |
|
8b3ec6814 take security_mma... |
1133 |
out_fput: |
bc56bba8f [PATCH] shm: make... |
1134 1135 1136 |
fput(file); out_nattch: |
d9a605e40 ipc: rename ids->... |
1137 |
down_write(&shm_ids(ns).rwsem); |
00c2bf85d ipc: get rid of i... |
1138 |
shp = shm_lock(ns, shmid); |
023a53557 ipc: integrate ip... |
1139 |
BUG_ON(IS_ERR(shp)); |
1da177e4c Linux-2.6.12-rc2 |
1140 |
shp->shm_nattch--; |
b34a6b1da ipc: introduce sh... |
1141 |
if (shm_may_destroy(ns, shp)) |
4e9823111 [PATCH] IPC names... |
1142 |
shm_destroy(ns, shp); |
1da177e4c Linux-2.6.12-rc2 |
1143 1144 |
else shm_unlock(shp); |
d9a605e40 ipc: rename ids->... |
1145 |
up_write(&shm_ids(ns).rwsem); |
1da177e4c Linux-2.6.12-rc2 |
1146 |
return err; |
bc56bba8f [PATCH] shm: make... |
1147 1148 |
out_unlock: |
c2c737a04 ipc,shm: shorten ... |
1149 |
rcu_read_unlock(); |
f42569b13 ipc,shm: cleanup ... |
1150 1151 |
out: return err; |
1da177e4c Linux-2.6.12-rc2 |
1152 |
} |
d5460c997 [CVE-2009-0029] S... |
1153 |
SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg) |
7d87e14c2 [PATCH] consolida... |
1154 1155 1156 |
{ unsigned long ret; long err; |
079a96ae3 ipc: add COMPAT_S... |
1157 |
err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); |
7d87e14c2 [PATCH] consolida... |
1158 1159 1160 1161 1162 |
if (err) return err; force_successful_syscall_return(); return (long)ret; } |
1da177e4c Linux-2.6.12-rc2 |
1163 1164 1165 1166 |
/* * detach and kill segment if marked destroyed. * The work is done in shm_close. */ |
d5460c997 [CVE-2009-0029] S... |
1167 |
SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) |
1da177e4c Linux-2.6.12-rc2 |
1168 1169 |
{ struct mm_struct *mm = current->mm; |
586c7e6a2 shm: fix unused w... |
1170 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1171 |
unsigned long addr = (unsigned long)shmaddr; |
1da177e4c Linux-2.6.12-rc2 |
1172 |
int retval = -EINVAL; |
586c7e6a2 shm: fix unused w... |
1173 1174 1175 1176 |
#ifdef CONFIG_MMU loff_t size = 0; struct vm_area_struct *next; #endif |
1da177e4c Linux-2.6.12-rc2 |
1177 |
|
df1e2fb54 [PATCH] shmdt: ch... |
1178 1179 |
if (addr & ~PAGE_MASK) return retval; |
1da177e4c Linux-2.6.12-rc2 |
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 |
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); |
8feae1311 NOMMU: Make VMAs ... |
1203 |
#ifdef CONFIG_MMU |
1da177e4c Linux-2.6.12-rc2 |
1204 1205 1206 1207 1208 1209 1210 1211 |
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... |
1212 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1213 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
496ad9aa8 new helper: file_... |
1214 |
size = file_inode(vma->vm_file)->i_size; |
1da177e4c Linux-2.6.12-rc2 |
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
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 |
25985edce Fix common misspe... |
1232 |
* prevent overflows and make comparisons vs. equal-width types. |
1da177e4c Linux-2.6.12-rc2 |
1233 |
*/ |
8e36709d8 [PATCH] shmdt can... |
1234 |
size = PAGE_ALIGN(size); |
1da177e4c Linux-2.6.12-rc2 |
1235 1236 1237 1238 |
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... |
1239 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1240 1241 1242 1243 1244 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); vma = next; } |
8feae1311 NOMMU: Make VMAs ... |
1245 1246 1247 |
#else /* CONFIG_MMU */ /* under NOMMU conditions, the exact address to be destroyed must be * given */ |
530fcd16d ipc, shm: guard a... |
1248 |
if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { |
8feae1311 NOMMU: Make VMAs ... |
1249 1250 1251 1252 1253 |
do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); retval = 0; } #endif |
1da177e4c Linux-2.6.12-rc2 |
1254 1255 1256 1257 1258 |
up_write(&mm->mmap_sem); return retval; } #ifdef CONFIG_PROC_FS |
19b4946ca [PATCH] ipc: conv... |
1259 |
static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4c Linux-2.6.12-rc2 |
1260 |
{ |
1efdb69b0 userns: Convert i... |
1261 |
struct user_namespace *user_ns = seq_user_ns(s); |
19b4946ca [PATCH] ipc: conv... |
1262 |
struct shmid_kernel *shp = it; |
b79521807 ipc/shm.c: add RS... |
1263 1264 1265 |
unsigned long rss = 0, swp = 0; shm_add_rss_swap(shp, &rss, &swp); |
1da177e4c Linux-2.6.12-rc2 |
1266 |
|
6c826818f /proc/sysvipc/shm... |
1267 1268 1269 1270 1271 |
#if BITS_PER_LONG <= 32 #define SIZE_SPEC "%10lu" #else #define SIZE_SPEC "%21lu" #endif |
1da177e4c Linux-2.6.12-rc2 |
1272 |
|
6c826818f /proc/sysvipc/shm... |
1273 1274 |
return seq_printf(s, "%10d %10d %4o " SIZE_SPEC " %5u %5u " |
b79521807 ipc/shm.c: add RS... |
1275 1276 1277 |
"%5lu %5u %5u %5u %5u %10lu %10lu %10lu " SIZE_SPEC " " SIZE_SPEC " ", |
19b4946ca [PATCH] ipc: conv... |
1278 |
shp->shm_perm.key, |
7ca7e564e ipc: store ipcs i... |
1279 |
shp->shm_perm.id, |
b33291c0b [PATCH] ipc: expa... |
1280 |
shp->shm_perm.mode, |
19b4946ca [PATCH] ipc: conv... |
1281 1282 1283 |
shp->shm_segsz, shp->shm_cprid, shp->shm_lprid, |
bc56bba8f [PATCH] shm: make... |
1284 |
shp->shm_nattch, |
1efdb69b0 userns: Convert i... |
1285 1286 1287 1288 |
from_kuid_munged(user_ns, shp->shm_perm.uid), from_kgid_munged(user_ns, shp->shm_perm.gid), from_kuid_munged(user_ns, shp->shm_perm.cuid), from_kgid_munged(user_ns, shp->shm_perm.cgid), |
19b4946ca [PATCH] ipc: conv... |
1289 1290 |
shp->shm_atim, shp->shm_dtim, |
b79521807 ipc/shm.c: add RS... |
1291 1292 1293 |
shp->shm_ctim, rss * PAGE_SIZE, swp * PAGE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1294 1295 |
} #endif |