Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/ipc/shm.c |
| 4 | * Copyright (C) 1992, 1993 Krishna Balasubramanian |
| 5 | * Many improvements/fixes by Bruno Haible. |
| 6 | * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. |
| 7 | * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. |
| 8 | * |
| 9 | * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com> |
| 10 | * BIGMEM support, Andrea Arcangeli <andrea@suse.de> |
| 11 | * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr> |
| 12 | * HIGHMEM support, Ingo Molnar <mingo@redhat.com> |
| 13 | * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com> |
| 14 | * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com> |
| 15 | * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com> |
| 16 | * |
Steve Grubb | 073115d | 2006-04-02 17:07:33 -0400 | [diff] [blame] | 17 | * support for audit of ipc object properties and permission changes |
| 18 | * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 19 | * |
| 20 | * namespaces support |
| 21 | * OpenVZ, SWsoft Inc. |
| 22 | * Pavel Emelianov <xemul@openvz.org> |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 23 | * |
| 24 | * Better ipc lock (kern_ipc_perm.lock) handling |
| 25 | * Davidlohr Bueso <davidlohr.bueso@hp.com>, June 2013. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | */ |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/slab.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/hugetlb.h> |
| 31 | #include <linux/shm.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/file.h> |
| 34 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/shmem_fs.h> |
| 36 | #include <linux/security.h> |
| 37 | #include <linux/syscalls.h> |
| 38 | #include <linux/audit.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 39 | #include <linux/capability.h> |
Stephen Rothwell | 7d87e14c | 2005-05-01 08:59:12 -0700 | [diff] [blame] | 40 | #include <linux/ptrace.h> |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 41 | #include <linux/seq_file.h> |
Nadia Derbey | 3e148c7 | 2007-10-18 23:40:54 -0700 | [diff] [blame] | 42 | #include <linux/rwsem.h> |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 43 | #include <linux/nsproxy.h> |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 44 | #include <linux/mount.h> |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 45 | #include <linux/ipc_namespace.h> |
Stephen Rothwell | 7d87e14c | 2005-05-01 08:59:12 -0700 | [diff] [blame] | 46 | |
Paul McQuade | 7153e40 | 2014-06-06 14:37:37 -0700 | [diff] [blame] | 47 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | #include "util.h" |
| 50 | |
Eric W. Biederman | a2e102c | 2018-03-22 21:34:44 -0500 | [diff] [blame] | 51 | struct shmid_kernel /* private to the kernel */ |
| 52 | { |
| 53 | struct kern_ipc_perm shm_perm; |
| 54 | struct file *shm_file; |
| 55 | unsigned long shm_nattch; |
| 56 | unsigned long shm_segsz; |
| 57 | time64_t shm_atim; |
| 58 | time64_t shm_dtim; |
| 59 | time64_t shm_ctim; |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 60 | struct pid *shm_cprid; |
| 61 | struct pid *shm_lprid; |
Eric W. Biederman | a2e102c | 2018-03-22 21:34:44 -0500 | [diff] [blame] | 62 | struct user_struct *mlock_user; |
| 63 | |
| 64 | /* The task created the shm object. NULL if the task is dead. */ |
| 65 | struct task_struct *shm_creator; |
| 66 | struct list_head shm_clist; /* list by creator */ |
| 67 | } __randomize_layout; |
| 68 | |
| 69 | /* shm_mode upper byte flags */ |
| 70 | #define SHM_DEST 01000 /* segment will be destroyed on last detach */ |
| 71 | #define SHM_LOCKED 02000 /* segment will not be swapped */ |
| 72 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 73 | struct shm_file_data { |
| 74 | int id; |
| 75 | struct ipc_namespace *ns; |
| 76 | struct file *file; |
| 77 | const struct vm_operations_struct *vm_ops; |
| 78 | }; |
| 79 | |
| 80 | #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) |
| 81 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 82 | static const struct file_operations shm_file_operations; |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 83 | static const struct vm_operations_struct shm_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Pierre Peiffer | ed2ddbf | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 85 | #define shm_ids(ns) ((ns)->ids[IPC_SHM_IDS]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 87 | #define shm_unlock(shp) \ |
| 88 | ipc_unlock(&(shp)->shm_perm) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 89 | |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 90 | static int newseg(struct ipc_namespace *, struct ipc_params *); |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 91 | static void shm_open(struct vm_area_struct *vma); |
| 92 | static void shm_close(struct vm_area_struct *vma); |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 93 | static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #ifdef CONFIG_PROC_FS |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 95 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #endif |
| 97 | |
Guillaume Knispel | 0cfb6ae | 2017-09-08 16:17:55 -0700 | [diff] [blame] | 98 | int shm_init_ns(struct ipc_namespace *ns) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 99 | { |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 100 | ns->shm_ctlmax = SHMMAX; |
| 101 | ns->shm_ctlall = SHMALL; |
| 102 | ns->shm_ctlmni = SHMMNI; |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 103 | ns->shm_rmid_forced = 0; |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 104 | ns->shm_tot = 0; |
Guillaume Knispel | 0cfb6ae | 2017-09-08 16:17:55 -0700 | [diff] [blame] | 105 | return ipc_init_ids(&shm_ids(ns)); |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 108 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 109 | * Called with shm_ids.rwsem (writer) and the shp structure locked. |
| 110 | * Only shm_ids.rwsem remains locked on exit. |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 111 | */ |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 112 | static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 113 | { |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 114 | struct shmid_kernel *shp; |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 115 | |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 116 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
| 117 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 118 | if (shp->shm_nattch) { |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 119 | shp->shm_perm.mode |= SHM_DEST; |
| 120 | /* Do not find it any more */ |
Guillaume Knispel | 0cfb6ae | 2017-09-08 16:17:55 -0700 | [diff] [blame] | 121 | ipc_set_key_private(&shm_ids(ns), &shp->shm_perm); |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 122 | shm_unlock(shp); |
| 123 | } else |
| 124 | shm_destroy(ns, shp); |
| 125 | } |
| 126 | |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 127 | #ifdef CONFIG_IPC_NS |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 128 | void shm_exit_ns(struct ipc_namespace *ns) |
| 129 | { |
Pierre Peiffer | 01b8b07 | 2008-02-08 04:18:57 -0800 | [diff] [blame] | 130 | free_ipcs(ns, &shm_ids(ns), do_shm_rmid); |
Serge E. Hallyn | 7d6feeb | 2009-12-15 16:47:27 -0800 | [diff] [blame] | 131 | idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr); |
Guillaume Knispel | 0cfb6ae | 2017-09-08 16:17:55 -0700 | [diff] [blame] | 132 | rhashtable_destroy(&ns->ids[IPC_SHM_IDS].key_ht); |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 133 | } |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 134 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Linus Torvalds | 140d0b2 | 2011-08-04 19:35:59 -1000 | [diff] [blame] | 136 | static int __init ipc_ns_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Guillaume Knispel | 0cfb6ae | 2017-09-08 16:17:55 -0700 | [diff] [blame] | 138 | const int err = shm_init_ns(&init_ipc_ns); |
| 139 | WARN(err, "ipc: sysv shm_init_ns failed: %d\n", err); |
| 140 | return err; |
Linus Torvalds | 140d0b2 | 2011-08-04 19:35:59 -1000 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | pure_initcall(ipc_ns_init); |
| 144 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 145 | void __init shm_init(void) |
Linus Torvalds | 140d0b2 | 2011-08-04 19:35:59 -1000 | [diff] [blame] | 146 | { |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 147 | ipc_init_proc_interface("sysvipc/shm", |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 148 | #if BITS_PER_LONG <= 32 |
| 149 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n", |
| 150 | #else |
| 151 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n", |
| 152 | #endif |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 153 | IPC_SHM_IDS, sysvipc_shm_proc_show); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Davidlohr Bueso | 8b8d52a | 2013-09-11 14:26:15 -0700 | [diff] [blame] | 156 | static inline struct shmid_kernel *shm_obtain_object(struct ipc_namespace *ns, int id) |
| 157 | { |
Davidlohr Bueso | 55b7ae5 | 2015-06-30 14:58:42 -0700 | [diff] [blame] | 158 | struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&shm_ids(ns), id); |
Davidlohr Bueso | 8b8d52a | 2013-09-11 14:26:15 -0700 | [diff] [blame] | 159 | |
| 160 | if (IS_ERR(ipcp)) |
| 161 | return ERR_CAST(ipcp); |
| 162 | |
| 163 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
| 164 | } |
| 165 | |
| 166 | static inline struct shmid_kernel *shm_obtain_object_check(struct ipc_namespace *ns, int id) |
| 167 | { |
| 168 | struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&shm_ids(ns), id); |
| 169 | |
| 170 | if (IS_ERR(ipcp)) |
| 171 | return ERR_CAST(ipcp); |
| 172 | |
| 173 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
| 174 | } |
| 175 | |
Nadia Derbey | 3e148c7 | 2007-10-18 23:40:54 -0700 | [diff] [blame] | 176 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 177 | * shm_lock_(check_) routines are called in the paths where the rwsem |
Nadia Derbey | 00c2bf8 | 2008-07-25 01:48:03 -0700 | [diff] [blame] | 178 | * is not necessarily held. |
Nadia Derbey | 3e148c7 | 2007-10-18 23:40:54 -0700 | [diff] [blame] | 179 | */ |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 180 | static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 182 | struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id); |
| 183 | |
Davidlohr Bueso | c5c8975 | 2015-06-30 14:58:36 -0700 | [diff] [blame] | 184 | /* |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 185 | * Callers of shm_lock() must validate the status of the returned ipc |
| 186 | * object pointer (as returned by ipc_lock()), and error out as |
| 187 | * appropriate. |
Davidlohr Bueso | c5c8975 | 2015-06-30 14:58:36 -0700 | [diff] [blame] | 188 | */ |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 189 | if (IS_ERR(ipcp)) |
| 190 | return (void *)ipcp; |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 191 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 194 | static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp) |
| 195 | { |
| 196 | rcu_read_lock(); |
Davidlohr Bueso | cf9d5d7 | 2013-07-08 16:01:11 -0700 | [diff] [blame] | 197 | ipc_lock_object(&ipcp->shm_perm); |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 198 | } |
| 199 | |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 200 | static void shm_rcu_free(struct rcu_head *head) |
| 201 | { |
Manfred Spraul | dba4cdd | 2017-07-12 14:34:41 -0700 | [diff] [blame] | 202 | struct kern_ipc_perm *ptr = container_of(head, struct kern_ipc_perm, |
| 203 | rcu); |
| 204 | struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel, |
| 205 | shm_perm); |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 206 | security_shm_free(&shp->shm_perm); |
Kees Cook | 42e618f | 2017-07-12 14:35:25 -0700 | [diff] [blame] | 207 | kvfree(shp); |
Davidlohr Bueso | 53dad6d | 2013-09-23 17:04:45 -0700 | [diff] [blame] | 208 | } |
| 209 | |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 210 | static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
Jack Miller | ab602f7 | 2014-08-08 14:23:19 -0700 | [diff] [blame] | 212 | list_del(&s->shm_clist); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 213 | ipc_rmid(&shm_ids(ns), &s->shm_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 217 | static int __shm_open(struct vm_area_struct *vma) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 218 | { |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 219 | struct file *file = vma->vm_file; |
| 220 | struct shm_file_data *sfd = shm_file_data(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | struct shmid_kernel *shp; |
| 222 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 223 | shp = shm_lock(sfd->ns, sfd->id); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 224 | |
| 225 | if (IS_ERR(shp)) |
| 226 | return PTR_ERR(shp); |
| 227 | |
Eric Biggers | 3f05317 | 2018-04-13 15:35:30 -0700 | [diff] [blame] | 228 | if (shp->shm_file != sfd->file) { |
| 229 | /* ID was reused */ |
| 230 | shm_unlock(shp); |
| 231 | return -EINVAL; |
| 232 | } |
| 233 | |
Deepa Dinamani | 7ff2819 | 2017-08-02 19:51:14 -0700 | [diff] [blame] | 234 | shp->shm_atim = ktime_get_real_seconds(); |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 235 | ipc_update_pid(&shp->shm_lprid, task_tgid(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | shp->shm_nattch++; |
| 237 | shm_unlock(shp); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | /* This is called by fork, once for every shm attach. */ |
| 242 | static void shm_open(struct vm_area_struct *vma) |
| 243 | { |
| 244 | int err = __shm_open(vma); |
| 245 | /* |
| 246 | * We raced in the idr lookup or with shm_destroy(). |
| 247 | * Either way, the ID is busted. |
| 248 | */ |
| 249 | WARN_ON_ONCE(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* |
| 253 | * shm_destroy - free the struct shmid_kernel |
| 254 | * |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 255 | * @ns: namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | * @shp: struct to free |
| 257 | * |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 258 | * It has to be called with shp and shm_ids.rwsem (writer) locked, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | * but returns with shp unlocked and freed. |
| 260 | */ |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 261 | static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | { |
Greg Thelen | a399b29 | 2013-11-21 14:32:00 -0800 | [diff] [blame] | 263 | struct file *shm_file; |
| 264 | |
| 265 | shm_file = shp->shm_file; |
| 266 | shp->shm_file = NULL; |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 267 | ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 268 | shm_rmid(ns, shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | shm_unlock(shp); |
Greg Thelen | a399b29 | 2013-11-21 14:32:00 -0800 | [diff] [blame] | 270 | if (!is_file_hugepages(shm_file)) |
| 271 | shmem_lock(shm_file, 0, shp->mlock_user); |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 272 | else if (shp->mlock_user) |
Dave Hansen | 07a46ed | 2014-12-12 16:58:22 -0800 | [diff] [blame] | 273 | user_shm_unlock(i_size_read(file_inode(shm_file)), |
| 274 | shp->mlock_user); |
Greg Thelen | a399b29 | 2013-11-21 14:32:00 -0800 | [diff] [blame] | 275 | fput(shm_file); |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 276 | ipc_update_pid(&shp->shm_cprid, NULL); |
| 277 | ipc_update_pid(&shp->shm_lprid, NULL); |
Manfred Spraul | dba4cdd | 2017-07-12 14:34:41 -0700 | [diff] [blame] | 278 | ipc_rcu_putref(&shp->shm_perm, shm_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | /* |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 282 | * shm_may_destroy - identifies whether shm segment should be destroyed now |
| 283 | * |
| 284 | * Returns true if and only if there are no active users of the segment and |
| 285 | * one of the following is true: |
| 286 | * |
| 287 | * 1) shmctl(id, IPC_RMID, NULL) was called for this shp |
| 288 | * |
| 289 | * 2) sysctl kernel.shm_rmid_forced is set to 1. |
| 290 | */ |
| 291 | static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
| 292 | { |
| 293 | return (shp->shm_nattch == 0) && |
| 294 | (ns->shm_rmid_forced || |
| 295 | (shp->shm_perm.mode & SHM_DEST)); |
| 296 | } |
| 297 | |
| 298 | /* |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 299 | * remove the attach descriptor vma. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | * free memory for segment if it is marked destroyed. |
| 301 | * The descriptor has already been removed from the current->mm->mmap list |
| 302 | * and will later be kfree()d. |
| 303 | */ |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 304 | static void shm_close(struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 306 | struct file *file = vma->vm_file; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 307 | struct shm_file_data *sfd = shm_file_data(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | struct shmid_kernel *shp; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 309 | struct ipc_namespace *ns = sfd->ns; |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 310 | |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 311 | down_write(&shm_ids(ns).rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* remove from the list of attaches of the shm segment */ |
Nadia Derbey | 00c2bf8 | 2008-07-25 01:48:03 -0700 | [diff] [blame] | 313 | shp = shm_lock(ns, sfd->id); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 314 | |
| 315 | /* |
| 316 | * We raced in the idr lookup or with shm_destroy(). |
| 317 | * Either way, the ID is busted. |
| 318 | */ |
| 319 | if (WARN_ON_ONCE(IS_ERR(shp))) |
| 320 | goto done; /* no-op */ |
| 321 | |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 322 | ipc_update_pid(&shp->shm_lprid, task_tgid(current)); |
Deepa Dinamani | 7ff2819 | 2017-08-02 19:51:14 -0700 | [diff] [blame] | 323 | shp->shm_dtim = ktime_get_real_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | shp->shm_nattch--; |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 325 | if (shm_may_destroy(ns, shp)) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 326 | shm_destroy(ns, shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | else |
| 328 | shm_unlock(shp); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 329 | done: |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 330 | up_write(&shm_ids(ns).rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 333 | /* Called with ns->shm_ids(ns).rwsem locked */ |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 334 | static int shm_try_destroy_orphaned(int id, void *p, void *data) |
| 335 | { |
| 336 | struct ipc_namespace *ns = data; |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 337 | struct kern_ipc_perm *ipcp = p; |
| 338 | struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 339 | |
| 340 | /* |
| 341 | * We want to destroy segments without users and with already |
| 342 | * exit'ed originating process. |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 343 | * |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 344 | * As shp->* are changed under rwsem, it's safe to skip shp locking. |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 345 | */ |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 346 | if (shp->shm_creator != NULL) |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 347 | return 0; |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 348 | |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 349 | if (shm_may_destroy(ns, shp)) { |
| 350 | shm_lock_by_ptr(shp); |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 351 | shm_destroy(ns, shp); |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 352 | } |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | void shm_destroy_orphaned(struct ipc_namespace *ns) |
| 357 | { |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 358 | down_write(&shm_ids(ns).rwsem); |
Vasiliy Kulikov | 33a30ed | 2011-08-03 22:26:55 +0400 | [diff] [blame] | 359 | if (shm_ids(ns).in_use) |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 360 | idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 361 | up_write(&shm_ids(ns).rwsem); |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Jack Miller | 83293c0 | 2014-08-08 14:23:21 -0700 | [diff] [blame] | 364 | /* Locking assumes this will only be called with task == current */ |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 365 | void exit_shm(struct task_struct *task) |
| 366 | { |
Vasiliy Kulikov | 4c677e2 | 2011-07-29 03:56:40 +0400 | [diff] [blame] | 367 | struct ipc_namespace *ns = task->nsproxy->ipc_ns; |
Jack Miller | ab602f7 | 2014-08-08 14:23:19 -0700 | [diff] [blame] | 368 | struct shmid_kernel *shp, *n; |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 369 | |
Jack Miller | 83293c0 | 2014-08-08 14:23:21 -0700 | [diff] [blame] | 370 | if (list_empty(&task->sysvshm.shm_clist)) |
Vasiliy Kulikov | 298507d | 2011-08-03 22:28:26 +0400 | [diff] [blame] | 371 | return; |
| 372 | |
Jack Miller | 83293c0 | 2014-08-08 14:23:21 -0700 | [diff] [blame] | 373 | /* |
| 374 | * If kernel.shm_rmid_forced is not set then only keep track of |
| 375 | * which shmids are orphaned, so that a later set of the sysctl |
| 376 | * can clean them up. |
| 377 | */ |
| 378 | if (!ns->shm_rmid_forced) { |
| 379 | down_read(&shm_ids(ns).rwsem); |
| 380 | list_for_each_entry(shp, &task->sysvshm.shm_clist, shm_clist) |
| 381 | shp->shm_creator = NULL; |
| 382 | /* |
| 383 | * Only under read lock but we are only called on current |
| 384 | * so no entry on the list will be shared. |
| 385 | */ |
| 386 | list_del(&task->sysvshm.shm_clist); |
| 387 | up_read(&shm_ids(ns).rwsem); |
| 388 | return; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Destroy all already created segments, that were not yet mapped, |
| 393 | * and mark any mapped as orphan to cover the sysctl toggling. |
| 394 | * Destroy is skipped if shm_may_destroy() returns false. |
| 395 | */ |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 396 | down_write(&shm_ids(ns).rwsem); |
Jack Miller | 83293c0 | 2014-08-08 14:23:21 -0700 | [diff] [blame] | 397 | list_for_each_entry_safe(shp, n, &task->sysvshm.shm_clist, shm_clist) { |
| 398 | shp->shm_creator = NULL; |
| 399 | |
| 400 | if (shm_may_destroy(ns, shp)) { |
| 401 | shm_lock_by_ptr(shp); |
| 402 | shm_destroy(ns, shp); |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | /* Remove the list head from any segments still attached. */ |
Jack Miller | ab602f7 | 2014-08-08 14:23:19 -0700 | [diff] [blame] | 407 | list_del(&task->sysvshm.shm_clist); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 408 | up_write(&shm_ids(ns).rwsem); |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 409 | } |
| 410 | |
Souptick Joarder | 14f28f5 | 2018-06-14 15:27:55 -0700 | [diff] [blame] | 411 | static vm_fault_t shm_fault(struct vm_fault *vmf) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 412 | { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 413 | struct file *file = vmf->vma->vm_file; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 414 | struct shm_file_data *sfd = shm_file_data(file); |
| 415 | |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 416 | return sfd->vm_ops->fault(vmf); |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 417 | } |
| 418 | |
Mike Kravetz | 3d942ee | 2018-03-28 16:01:01 -0700 | [diff] [blame] | 419 | static int shm_split(struct vm_area_struct *vma, unsigned long addr) |
| 420 | { |
| 421 | struct file *file = vma->vm_file; |
| 422 | struct shm_file_data *sfd = shm_file_data(file); |
| 423 | |
Andrew Morton | a61fc2c | 2018-04-10 16:35:42 -0700 | [diff] [blame] | 424 | if (sfd->vm_ops->split) |
Mike Kravetz | 3d942ee | 2018-03-28 16:01:01 -0700 | [diff] [blame] | 425 | return sfd->vm_ops->split(vma, addr); |
| 426 | |
| 427 | return 0; |
| 428 | } |
| 429 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 430 | #ifdef CONFIG_NUMA |
Adrian Bunk | d823e3e | 2007-10-16 23:26:42 -0700 | [diff] [blame] | 431 | static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 432 | { |
| 433 | struct file *file = vma->vm_file; |
| 434 | struct shm_file_data *sfd = shm_file_data(file); |
| 435 | int err = 0; |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 436 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 437 | if (sfd->vm_ops->set_policy) |
| 438 | err = sfd->vm_ops->set_policy(vma, new); |
| 439 | return err; |
| 440 | } |
| 441 | |
Adrian Bunk | d823e3e | 2007-10-16 23:26:42 -0700 | [diff] [blame] | 442 | static struct mempolicy *shm_get_policy(struct vm_area_struct *vma, |
| 443 | unsigned long addr) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 444 | { |
| 445 | struct file *file = vma->vm_file; |
| 446 | struct shm_file_data *sfd = shm_file_data(file); |
| 447 | struct mempolicy *pol = NULL; |
| 448 | |
| 449 | if (sfd->vm_ops->get_policy) |
| 450 | pol = sfd->vm_ops->get_policy(vma, addr); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 451 | else if (vma->vm_policy) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 452 | pol = vma->vm_policy; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 453 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 454 | return pol; |
| 455 | } |
| 456 | #endif |
| 457 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 458 | static int shm_mmap(struct file *file, struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 460 | struct shm_file_data *sfd = shm_file_data(file); |
David Howells | b0e1519 | 2006-01-06 00:11:42 -0800 | [diff] [blame] | 461 | int ret; |
| 462 | |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 463 | /* |
Eric Biggers | 3f05317 | 2018-04-13 15:35:30 -0700 | [diff] [blame] | 464 | * In case of remap_file_pages() emulation, the file can represent an |
| 465 | * IPC ID that was removed, and possibly even reused by another shm |
| 466 | * segment already. Propagate this case as an error to caller. |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 467 | */ |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 468 | ret = __shm_open(vma); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 469 | if (ret) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 470 | return ret; |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 471 | |
Miklos Szeredi | f74ac01 | 2017-02-20 16:51:23 +0100 | [diff] [blame] | 472 | ret = call_mmap(sfd->file, vma); |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 473 | if (ret) { |
| 474 | shm_close(vma); |
| 475 | return ret; |
| 476 | } |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 477 | sfd->vm_ops = vma->vm_ops; |
David Howells | 2e92a3b | 2007-07-31 00:37:24 -0700 | [diff] [blame] | 478 | #ifdef CONFIG_MMU |
Davidlohr Bueso | d0edd85 | 2015-09-09 15:39:20 -0700 | [diff] [blame] | 479 | WARN_ON(!sfd->vm_ops->fault); |
David Howells | 2e92a3b | 2007-07-31 00:37:24 -0700 | [diff] [blame] | 480 | #endif |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 481 | vma->vm_ops = &shm_vm_ops; |
Kirill A. Shutemov | 1ac0b6d | 2016-02-17 13:11:35 -0800 | [diff] [blame] | 482 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 485 | static int shm_release(struct inode *ino, struct file *file) |
| 486 | { |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 487 | struct shm_file_data *sfd = shm_file_data(file); |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 488 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 489 | put_ipc_ns(sfd->ns); |
Eric Biggers | 3f05317 | 2018-04-13 15:35:30 -0700 | [diff] [blame] | 490 | fput(sfd->file); |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 491 | shm_file_data(file) = NULL; |
| 492 | kfree(sfd); |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 493 | return 0; |
| 494 | } |
| 495 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 496 | static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 497 | { |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 498 | struct shm_file_data *sfd = shm_file_data(file); |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 499 | |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 500 | if (!sfd->file->f_op->fsync) |
| 501 | return -EINVAL; |
Jeff Layton | 0f41074 | 2017-07-05 15:26:50 -0400 | [diff] [blame] | 502 | return sfd->file->f_op->fsync(sfd->file, start, end, datasync); |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 503 | } |
| 504 | |
Will Deacon | 7d8a456 | 2012-06-07 14:21:13 -0700 | [diff] [blame] | 505 | static long shm_fallocate(struct file *file, int mode, loff_t offset, |
| 506 | loff_t len) |
| 507 | { |
| 508 | struct shm_file_data *sfd = shm_file_data(file); |
| 509 | |
| 510 | if (!sfd->file->f_op->fallocate) |
| 511 | return -EOPNOTSUPP; |
| 512 | return sfd->file->f_op->fallocate(file, mode, offset, len); |
| 513 | } |
| 514 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 515 | static unsigned long shm_get_unmapped_area(struct file *file, |
| 516 | unsigned long addr, unsigned long len, unsigned long pgoff, |
| 517 | unsigned long flags) |
| 518 | { |
| 519 | struct shm_file_data *sfd = shm_file_data(file); |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 520 | |
Al Viro | c4caa77 | 2009-11-30 08:38:43 -0500 | [diff] [blame] | 521 | return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len, |
| 522 | pgoff, flags); |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 523 | } |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 524 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 525 | static const struct file_operations shm_file_operations = { |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 526 | .mmap = shm_mmap, |
Adam Litke | 516dffd | 2007-03-01 15:46:08 -0800 | [diff] [blame] | 527 | .fsync = shm_fsync, |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 528 | .release = shm_release, |
David Howells | ed5e589 | 2010-01-15 17:01:32 -0800 | [diff] [blame] | 529 | .get_unmapped_area = shm_get_unmapped_area, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 530 | .llseek = noop_llseek, |
Will Deacon | 7d8a456 | 2012-06-07 14:21:13 -0700 | [diff] [blame] | 531 | .fallocate = shm_fallocate, |
Al Viro | c4caa77 | 2009-11-30 08:38:43 -0500 | [diff] [blame] | 532 | }; |
| 533 | |
Hugh Dickins | c01d5b3 | 2016-07-26 15:26:15 -0700 | [diff] [blame] | 534 | /* |
| 535 | * shm_file_operations_huge is now identical to shm_file_operations, |
| 536 | * but we keep it distinct for the sake of is_file_shm_hugepages(). |
| 537 | */ |
Al Viro | c4caa77 | 2009-11-30 08:38:43 -0500 | [diff] [blame] | 538 | static const struct file_operations shm_file_operations_huge = { |
| 539 | .mmap = shm_mmap, |
| 540 | .fsync = shm_fsync, |
| 541 | .release = shm_release, |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 542 | .get_unmapped_area = shm_get_unmapped_area, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 543 | .llseek = noop_llseek, |
Will Deacon | 7d8a456 | 2012-06-07 14:21:13 -0700 | [diff] [blame] | 544 | .fallocate = shm_fallocate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | }; |
| 546 | |
Yaowei Bai | 2954e440 | 2016-01-20 15:01:11 -0800 | [diff] [blame] | 547 | bool is_file_shm_hugepages(struct file *file) |
Al Viro | c4caa77 | 2009-11-30 08:38:43 -0500 | [diff] [blame] | 548 | { |
| 549 | return file->f_op == &shm_file_operations_huge; |
| 550 | } |
| 551 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 552 | static const struct vm_operations_struct shm_vm_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | .open = shm_open, /* callback for a new vm-area open */ |
| 554 | .close = shm_close, /* callback for when the vm-area is released */ |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 555 | .fault = shm_fault, |
Mike Kravetz | 3d942ee | 2018-03-28 16:01:01 -0700 | [diff] [blame] | 556 | .split = shm_split, |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 557 | #if defined(CONFIG_NUMA) |
| 558 | .set_policy = shm_set_policy, |
| 559 | .get_policy = shm_get_policy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | #endif |
| 561 | }; |
| 562 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 563 | /** |
| 564 | * newseg - Create a new shared memory segment |
| 565 | * @ns: namespace |
| 566 | * @params: ptr to the structure that contains key, size and shmflg |
| 567 | * |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 568 | * Called with shm_ids.rwsem held as a writer. |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 569 | */ |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 570 | static int newseg(struct ipc_namespace *ns, struct ipc_params *params) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 572 | key_t key = params->key; |
| 573 | int shmflg = params->flg; |
| 574 | size_t size = params->u.size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | int error; |
| 576 | struct shmid_kernel *shp; |
Robin Holt | d69f3ba | 2013-04-30 19:15:54 -0700 | [diff] [blame] | 577 | size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 578 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | char name[13]; |
KOSAKI Motohiro | ca16d14 | 2011-05-26 19:16:19 +0900 | [diff] [blame] | 580 | vm_flags_t acctflag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 582 | if (size < SHMMIN || size > ns->shm_ctlmax) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | return -EINVAL; |
| 584 | |
Manfred Spraul | 1376327 | 2014-06-06 14:37:41 -0700 | [diff] [blame] | 585 | if (numpages << PAGE_SHIFT < size) |
| 586 | return -ENOSPC; |
| 587 | |
Manfred Spraul | 09c6eb1 | 2014-06-06 14:37:40 -0700 | [diff] [blame] | 588 | if (ns->shm_tot + numpages < ns->shm_tot || |
| 589 | ns->shm_tot + numpages > ns->shm_ctlall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | return -ENOSPC; |
| 591 | |
Kees Cook | 42e618f | 2017-07-12 14:35:25 -0700 | [diff] [blame] | 592 | shp = kvmalloc(sizeof(*shp), GFP_KERNEL); |
| 593 | if (unlikely(!shp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return -ENOMEM; |
| 595 | |
| 596 | shp->shm_perm.key = key; |
Andrew Morton | b33291c | 2006-01-08 01:02:21 -0800 | [diff] [blame] | 597 | shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | shp->mlock_user = NULL; |
| 599 | |
| 600 | shp->shm_perm.security = NULL; |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 601 | error = security_shm_alloc(&shp->shm_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | if (error) { |
Kees Cook | 42e618f | 2017-07-12 14:35:25 -0700 | [diff] [blame] | 603 | kvfree(shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | return error; |
| 605 | } |
| 606 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 607 | sprintf(name, "SYSV%08x", key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | if (shmflg & SHM_HUGETLB) { |
Andrew Morton | c103a4d | 2013-07-08 16:01:08 -0700 | [diff] [blame] | 609 | struct hstate *hs; |
Li Zefan | 091d0d5 | 2013-05-09 15:08:15 +0800 | [diff] [blame] | 610 | size_t hugesize; |
| 611 | |
Andrew Morton | c103a4d | 2013-07-08 16:01:08 -0700 | [diff] [blame] | 612 | hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); |
Li Zefan | 091d0d5 | 2013-05-09 15:08:15 +0800 | [diff] [blame] | 613 | if (!hs) { |
| 614 | error = -EINVAL; |
| 615 | goto no_file; |
| 616 | } |
| 617 | hugesize = ALIGN(size, huge_page_size(hs)); |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 618 | |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 619 | /* hugetlb_file_setup applies strict accounting */ |
| 620 | if (shmflg & SHM_NORESERVE) |
| 621 | acctflag = VM_NORESERVE; |
Naoya Horiguchi | af73e4d | 2013-05-07 16:18:13 -0700 | [diff] [blame] | 622 | file = hugetlb_file_setup(name, hugesize, acctflag, |
Andi Kleen | 42d7395 | 2012-12-11 16:01:34 -0800 | [diff] [blame] | 623 | &shp->mlock_user, HUGETLB_SHMFS_INODE, |
| 624 | (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } else { |
Badari Pulavarty | bf8f972 | 2005-11-07 00:59:27 -0800 | [diff] [blame] | 626 | /* |
| 627 | * Do not allow no accounting for OVERCOMMIT_NEVER, even |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 628 | * if it's asked for. |
Badari Pulavarty | bf8f972 | 2005-11-07 00:59:27 -0800 | [diff] [blame] | 629 | */ |
| 630 | if ((shmflg & SHM_NORESERVE) && |
| 631 | sysctl_overcommit_memory != OVERCOMMIT_NEVER) |
Linus Torvalds | fc8744a | 2009-01-31 15:08:56 -0800 | [diff] [blame] | 632 | acctflag = VM_NORESERVE; |
Stephen Smalley | e1832f2 | 2015-08-06 15:46:55 -0700 | [diff] [blame] | 633 | file = shmem_kernel_file_setup(name, size, acctflag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
| 635 | error = PTR_ERR(file); |
| 636 | if (IS_ERR(file)) |
| 637 | goto no_file; |
| 638 | |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 639 | shp->shm_cprid = get_pid(task_tgid(current)); |
| 640 | shp->shm_lprid = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | shp->shm_atim = shp->shm_dtim = 0; |
Deepa Dinamani | 7ff2819 | 2017-08-02 19:51:14 -0700 | [diff] [blame] | 642 | shp->shm_ctim = ktime_get_real_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | shp->shm_segsz = size; |
| 644 | shp->shm_nattch = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | shp->shm_file = file; |
Vasiliy Kulikov | 5774ed0 | 2011-07-29 03:55:31 +0400 | [diff] [blame] | 646 | shp->shm_creator = current; |
Linus Torvalds | b9a5322 | 2015-09-30 12:48:40 -0400 | [diff] [blame] | 647 | |
Davidlohr Bueso | 39c96a1 | 2017-11-17 15:31:11 -0800 | [diff] [blame] | 648 | /* ipc_addid() locks shp upon success. */ |
Manfred Spraul | a2642f8 | 2017-07-12 14:35:16 -0700 | [diff] [blame] | 649 | error = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
| 650 | if (error < 0) |
Linus Torvalds | b9a5322 | 2015-09-30 12:48:40 -0400 | [diff] [blame] | 651 | goto no_id; |
Linus Torvalds | b9a5322 | 2015-09-30 12:48:40 -0400 | [diff] [blame] | 652 | |
Jack Miller | ab602f7 | 2014-08-08 14:23:19 -0700 | [diff] [blame] | 653 | list_add(&shp->shm_clist, ¤t->sysvshm.shm_clist); |
Davidlohr Bueso | dbfcd91 | 2013-07-08 16:01:09 -0700 | [diff] [blame] | 654 | |
Badari Pulavarty | 30475cc | 2007-06-16 10:15:59 -0700 | [diff] [blame] | 655 | /* |
| 656 | * shmid gets reported as "inode#" in /proc/pid/maps. |
| 657 | * proc-ps tools use this. Changing this will break them. |
| 658 | */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 659 | file_inode(file)->i_ino = shp->shm_perm.id; |
Krishnakumar R | 551110a | 2005-10-29 18:16:45 -0700 | [diff] [blame] | 660 | |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 661 | ns->shm_tot += numpages; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 662 | error = shp->shm_perm.id; |
Davidlohr Bueso | dbfcd91 | 2013-07-08 16:01:09 -0700 | [diff] [blame] | 663 | |
Davidlohr Bueso | cf9d5d7 | 2013-07-08 16:01:11 -0700 | [diff] [blame] | 664 | ipc_unlock_object(&shp->shm_perm); |
Davidlohr Bueso | dbfcd91 | 2013-07-08 16:01:09 -0700 | [diff] [blame] | 665 | rcu_read_unlock(); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 666 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | no_id: |
Eric W. Biederman | 2236d4d | 2018-03-28 13:38:55 -0500 | [diff] [blame] | 669 | ipc_update_pid(&shp->shm_cprid, NULL); |
| 670 | ipc_update_pid(&shp->shm_lprid, NULL); |
Hugh Dickins | 2195d28 | 2009-09-12 12:21:27 +0100 | [diff] [blame] | 671 | if (is_file_hugepages(file) && shp->mlock_user) |
Hugh Dickins | 353d5c3 | 2009-08-24 16:30:28 +0100 | [diff] [blame] | 672 | user_shm_unlock(size, shp->mlock_user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | fput(file); |
| 674 | no_file: |
Manfred Spraul | a2642f8 | 2017-07-12 14:35:16 -0700 | [diff] [blame] | 675 | call_rcu(&shp->shm_perm.rcu, shm_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | return error; |
| 677 | } |
| 678 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 679 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 680 | * Called with shm_ids.rwsem and ipcp locked. |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 681 | */ |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 682 | static inline int shm_more_checks(struct kern_ipc_perm *ipcp, |
| 683 | struct ipc_params *params) |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 684 | { |
Nadia Derbey | 03f02c7 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 685 | struct shmid_kernel *shp; |
| 686 | |
| 687 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
| 688 | if (shp->shm_segsz < params->u.size) |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 689 | return -EINVAL; |
| 690 | |
| 691 | return 0; |
| 692 | } |
| 693 | |
Dominik Brodowski | 65749e0 | 2018-03-20 20:07:53 +0100 | [diff] [blame] | 694 | long ksys_shmget(key_t key, size_t size, int shmflg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | { |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 696 | struct ipc_namespace *ns; |
Mathias Krause | eb66ec4 | 2014-06-06 14:37:36 -0700 | [diff] [blame] | 697 | static const struct ipc_ops shm_ops = { |
| 698 | .getnew = newseg, |
Eric W. Biederman | 50ab44b | 2018-03-23 23:41:55 -0500 | [diff] [blame] | 699 | .associate = security_shm_associate, |
Mathias Krause | eb66ec4 | 2014-06-06 14:37:36 -0700 | [diff] [blame] | 700 | .more_checks = shm_more_checks, |
| 701 | }; |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 702 | struct ipc_params shm_params; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 704 | ns = current->nsproxy->ipc_ns; |
| 705 | |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 706 | shm_params.key = key; |
| 707 | shm_params.flg = shmflg; |
| 708 | shm_params.u.size = size; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 709 | |
Nadia Derbey | 7748dbf | 2007-10-18 23:40:49 -0700 | [diff] [blame] | 710 | return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } |
| 712 | |
Dominik Brodowski | 65749e0 | 2018-03-20 20:07:53 +0100 | [diff] [blame] | 713 | SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg) |
| 714 | { |
| 715 | return ksys_shmget(key, size, shmflg); |
| 716 | } |
| 717 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) |
| 719 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 720 | switch (version) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | case IPC_64: |
| 722 | return copy_to_user(buf, in, sizeof(*in)); |
| 723 | case IPC_OLD: |
| 724 | { |
| 725 | struct shmid_ds out; |
| 726 | |
Vasiliy Kulikov | 3af54c9 | 2010-10-30 18:22:49 +0400 | [diff] [blame] | 727 | memset(&out, 0, sizeof(out)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); |
| 729 | out.shm_segsz = in->shm_segsz; |
| 730 | out.shm_atime = in->shm_atime; |
| 731 | out.shm_dtime = in->shm_dtime; |
| 732 | out.shm_ctime = in->shm_ctime; |
| 733 | out.shm_cpid = in->shm_cpid; |
| 734 | out.shm_lpid = in->shm_lpid; |
| 735 | out.shm_nattch = in->shm_nattch; |
| 736 | |
| 737 | return copy_to_user(buf, &out, sizeof(out)); |
| 738 | } |
| 739 | default: |
| 740 | return -EINVAL; |
| 741 | } |
| 742 | } |
| 743 | |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 744 | static inline unsigned long |
| 745 | copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 747 | switch (version) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | case IPC_64: |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 749 | if (copy_from_user(out, buf, sizeof(*out))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | case IPC_OLD: |
| 753 | { |
| 754 | struct shmid_ds tbuf_old; |
| 755 | |
| 756 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
| 757 | return -EFAULT; |
| 758 | |
Pierre Peiffer | 016d713 | 2008-04-29 01:00:50 -0700 | [diff] [blame] | 759 | out->shm_perm.uid = tbuf_old.shm_perm.uid; |
| 760 | out->shm_perm.gid = tbuf_old.shm_perm.gid; |
| 761 | out->shm_perm.mode = tbuf_old.shm_perm.mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | return 0; |
| 764 | } |
| 765 | default: |
| 766 | return -EINVAL; |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) |
| 771 | { |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 772 | switch (version) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | case IPC_64: |
| 774 | return copy_to_user(buf, in, sizeof(*in)); |
| 775 | case IPC_OLD: |
| 776 | { |
| 777 | struct shminfo out; |
| 778 | |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 779 | if (in->shmmax > INT_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | out.shmmax = INT_MAX; |
| 781 | else |
| 782 | out.shmmax = (int)in->shmmax; |
| 783 | |
| 784 | out.shmmin = in->shmmin; |
| 785 | out.shmmni = in->shmmni; |
| 786 | out.shmseg = in->shmseg; |
Paul McQuade | 46c0a8c | 2014-06-06 14:37:37 -0700 | [diff] [blame] | 787 | out.shmall = in->shmall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
| 789 | return copy_to_user(buf, &out, sizeof(out)); |
| 790 | } |
| 791 | default: |
| 792 | return -EINVAL; |
| 793 | } |
| 794 | } |
| 795 | |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 796 | /* |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 797 | * Calculate and add used RSS and swap pages of a shm. |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 798 | * Called with shm_ids.rwsem held as a reader |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 799 | */ |
| 800 | static void shm_add_rss_swap(struct shmid_kernel *shp, |
| 801 | unsigned long *rss_add, unsigned long *swp_add) |
| 802 | { |
| 803 | struct inode *inode; |
| 804 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 805 | inode = file_inode(shp->shm_file); |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 806 | |
| 807 | if (is_file_hugepages(shp->shm_file)) { |
| 808 | struct address_space *mapping = inode->i_mapping; |
| 809 | struct hstate *h = hstate_file(shp->shm_file); |
| 810 | *rss_add += pages_per_huge_page(h) * mapping->nrpages; |
| 811 | } else { |
| 812 | #ifdef CONFIG_SHMEM |
| 813 | struct shmem_inode_info *info = SHMEM_I(inode); |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 814 | |
Kirill A. Shutemov | 4595ef8 | 2016-07-26 15:26:29 -0700 | [diff] [blame] | 815 | spin_lock_irq(&info->lock); |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 816 | *rss_add += inode->i_mapping->nrpages; |
| 817 | *swp_add += info->swapped; |
Kirill A. Shutemov | 4595ef8 | 2016-07-26 15:26:29 -0700 | [diff] [blame] | 818 | spin_unlock_irq(&info->lock); |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 819 | #else |
| 820 | *rss_add += inode->i_mapping->nrpages; |
| 821 | #endif |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 826 | * Called with shm_ids.rwsem held as a reader |
Nadia Derbey | f4566f0 | 2007-10-18 23:40:53 -0700 | [diff] [blame] | 827 | */ |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 828 | static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, |
| 829 | unsigned long *swp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 831 | int next_id; |
| 832 | int total, in_use; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | *rss = 0; |
| 835 | *swp = 0; |
| 836 | |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 837 | in_use = shm_ids(ns).in_use; |
| 838 | |
| 839 | for (total = 0, next_id = 0; total < in_use; next_id++) { |
Tony Battersby | e562aeb | 2009-04-02 16:58:26 -0700 | [diff] [blame] | 840 | struct kern_ipc_perm *ipc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | struct shmid_kernel *shp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Tony Battersby | e562aeb | 2009-04-02 16:58:26 -0700 | [diff] [blame] | 843 | ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id); |
| 844 | if (ipc == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | continue; |
Tony Battersby | e562aeb | 2009-04-02 16:58:26 -0700 | [diff] [blame] | 846 | shp = container_of(ipc, struct shmid_kernel, shm_perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 848 | shm_add_rss_swap(shp, rss, swp); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 849 | |
| 850 | total++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
| 852 | } |
| 853 | |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 854 | /* |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 855 | * This function handles some shmctl commands which require the rwsem |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 856 | * to be held in write mode. |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 857 | * NOTE: no locks must be held, the rwsem is taken inside this function. |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 858 | */ |
| 859 | static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd, |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 860 | struct shmid64_ds *shmid64) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | { |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 862 | struct kern_ipc_perm *ipcp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | struct shmid_kernel *shp; |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 864 | int err; |
| 865 | |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 866 | down_write(&shm_ids(ns).rwsem); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 867 | rcu_read_lock(); |
| 868 | |
Davidlohr Bueso | 79ccf0f | 2013-09-11 14:26:16 -0700 | [diff] [blame] | 869 | ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd, |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 870 | &shmid64->shm_perm, 0); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 871 | if (IS_ERR(ipcp)) { |
| 872 | err = PTR_ERR(ipcp); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 873 | goto out_unlock1; |
| 874 | } |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 875 | |
Pierre Peiffer | a5f75e7 | 2008-04-29 01:00:54 -0700 | [diff] [blame] | 876 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 877 | |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 878 | err = security_shm_shmctl(&shp->shm_perm, cmd); |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 879 | if (err) |
Davidlohr Bueso | 79ccf0f | 2013-09-11 14:26:16 -0700 | [diff] [blame] | 880 | goto out_unlock1; |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 881 | |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 882 | switch (cmd) { |
| 883 | case IPC_RMID: |
Davidlohr Bueso | 79ccf0f | 2013-09-11 14:26:16 -0700 | [diff] [blame] | 884 | ipc_lock_object(&shp->shm_perm); |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 885 | /* do_shm_rmid unlocks the ipc object and rcu */ |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 886 | do_shm_rmid(ns, ipcp); |
| 887 | goto out_up; |
| 888 | case IPC_SET: |
Davidlohr Bueso | 79ccf0f | 2013-09-11 14:26:16 -0700 | [diff] [blame] | 889 | ipc_lock_object(&shp->shm_perm); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 890 | err = ipc_update_perm(&shmid64->shm_perm, ipcp); |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 891 | if (err) |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 892 | goto out_unlock0; |
Deepa Dinamani | 7ff2819 | 2017-08-02 19:51:14 -0700 | [diff] [blame] | 893 | shp->shm_ctim = ktime_get_real_seconds(); |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 894 | break; |
| 895 | default: |
| 896 | err = -EINVAL; |
Davidlohr Bueso | 79ccf0f | 2013-09-11 14:26:16 -0700 | [diff] [blame] | 897 | goto out_unlock1; |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 898 | } |
Davidlohr Bueso | 7b4cc5d | 2013-07-08 16:01:12 -0700 | [diff] [blame] | 899 | |
| 900 | out_unlock0: |
| 901 | ipc_unlock_object(&shp->shm_perm); |
| 902 | out_unlock1: |
| 903 | rcu_read_unlock(); |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 904 | out_up: |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 905 | up_write(&shm_ids(ns).rwsem); |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 906 | return err; |
| 907 | } |
| 908 | |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 909 | static int shmctl_ipc_info(struct ipc_namespace *ns, |
| 910 | struct shminfo64 *shminfo) |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 911 | { |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 912 | int err = security_shm_shmctl(NULL, IPC_INFO); |
| 913 | if (!err) { |
| 914 | memset(shminfo, 0, sizeof(*shminfo)); |
| 915 | shminfo->shmmni = shminfo->shmseg = ns->shm_ctlmni; |
| 916 | shminfo->shmmax = ns->shm_ctlmax; |
| 917 | shminfo->shmall = ns->shm_ctlall; |
| 918 | shminfo->shmmin = SHMMIN; |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 919 | down_read(&shm_ids(ns).rwsem); |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 920 | err = ipc_get_maxid(&shm_ids(ns)); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 921 | up_read(&shm_ids(ns).rwsem); |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 922 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 925 | return err; |
| 926 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 928 | static int shmctl_shm_info(struct ipc_namespace *ns, |
| 929 | struct shm_info *shm_info) |
| 930 | { |
| 931 | int err = security_shm_shmctl(NULL, SHM_INFO); |
| 932 | if (!err) { |
| 933 | memset(shm_info, 0, sizeof(*shm_info)); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 934 | down_read(&shm_ids(ns).rwsem); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 935 | shm_info->used_ids = shm_ids(ns).in_use; |
| 936 | shm_get_stat(ns, &shm_info->shm_rss, &shm_info->shm_swp); |
| 937 | shm_info->shm_tot = ns->shm_tot; |
| 938 | shm_info->swap_attempts = 0; |
| 939 | shm_info->swap_successes = 0; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 940 | err = ipc_get_maxid(&shm_ids(ns)); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 941 | up_read(&shm_ids(ns).rwsem); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 942 | if (err < 0) |
| 943 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 945 | return err; |
| 946 | } |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 947 | |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 948 | static int shmctl_stat(struct ipc_namespace *ns, int shmid, |
| 949 | int cmd, struct shmid64_ds *tbuf) |
| 950 | { |
| 951 | struct shmid_kernel *shp; |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 952 | int id = 0; |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 953 | int err; |
Davidlohr Bueso | c97cb9c | 2013-09-11 14:26:20 -0700 | [diff] [blame] | 954 | |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 955 | memset(tbuf, 0, sizeof(*tbuf)); |
| 956 | |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 957 | rcu_read_lock(); |
Davidlohr Bueso | c21a697 | 2018-04-10 16:35:23 -0700 | [diff] [blame] | 958 | if (cmd == SHM_STAT || cmd == SHM_STAT_ANY) { |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 959 | shp = shm_obtain_object(ns, shmid); |
| 960 | if (IS_ERR(shp)) { |
| 961 | err = PTR_ERR(shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | goto out_unlock; |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 963 | } |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 964 | id = shp->shm_perm.id; |
Davidlohr Bueso | c21a697 | 2018-04-10 16:35:23 -0700 | [diff] [blame] | 965 | } else { /* IPC_STAT */ |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 966 | shp = shm_obtain_object_check(ns, shmid); |
| 967 | if (IS_ERR(shp)) { |
| 968 | err = PTR_ERR(shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | goto out_unlock; |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 970 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | } |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 972 | |
Davidlohr Bueso | c21a697 | 2018-04-10 16:35:23 -0700 | [diff] [blame] | 973 | /* |
| 974 | * Semantically SHM_STAT_ANY ought to be identical to |
| 975 | * that functionality provided by the /proc/sysvipc/ |
| 976 | * interface. As such, only audit these calls and |
| 977 | * do not do traditional S_IRUGO permission checks on |
| 978 | * the ipc object. |
| 979 | */ |
| 980 | if (cmd == SHM_STAT_ANY) |
| 981 | audit_ipc_obj(&shp->shm_perm); |
| 982 | else { |
| 983 | err = -EACCES; |
| 984 | if (ipcperms(ns, &shp->shm_perm, S_IRUGO)) |
| 985 | goto out_unlock; |
| 986 | } |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 987 | |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 988 | err = security_shm_shmctl(&shp->shm_perm, cmd); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 989 | if (err) |
| 990 | goto out_unlock; |
| 991 | |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 992 | ipc_lock_object(&shp->shm_perm); |
| 993 | |
| 994 | if (!ipc_valid_object(&shp->shm_perm)) { |
| 995 | ipc_unlock_object(&shp->shm_perm); |
| 996 | err = -EIDRM; |
| 997 | goto out_unlock; |
| 998 | } |
| 999 | |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1000 | kernel_to_ipc64_perm(&shp->shm_perm, &tbuf->shm_perm); |
| 1001 | tbuf->shm_segsz = shp->shm_segsz; |
| 1002 | tbuf->shm_atime = shp->shm_atim; |
| 1003 | tbuf->shm_dtime = shp->shm_dtim; |
| 1004 | tbuf->shm_ctime = shp->shm_ctim; |
Arnd Bergmann | c2ab975 | 2015-04-28 21:39:50 +0200 | [diff] [blame] | 1005 | #ifndef CONFIG_64BIT |
| 1006 | tbuf->shm_atime_high = shp->shm_atim >> 32; |
| 1007 | tbuf->shm_dtime_high = shp->shm_dtim >> 32; |
| 1008 | tbuf->shm_ctime_high = shp->shm_ctim >> 32; |
| 1009 | #endif |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 1010 | tbuf->shm_cpid = pid_vnr(shp->shm_cprid); |
| 1011 | tbuf->shm_lpid = pid_vnr(shp->shm_lprid); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1012 | tbuf->shm_nattch = shp->shm_nattch; |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 1013 | |
| 1014 | ipc_unlock_object(&shp->shm_perm); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1015 | rcu_read_unlock(); |
Philippe Mikoyan | 87ad4b0 | 2018-02-06 15:40:49 -0800 | [diff] [blame] | 1016 | return id; |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1017 | |
| 1018 | out_unlock: |
Davidlohr Bueso | c97cb9c | 2013-09-11 14:26:20 -0700 | [diff] [blame] | 1019 | rcu_read_unlock(); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1020 | return err; |
| 1021 | } |
| 1022 | |
| 1023 | static int shmctl_do_lock(struct ipc_namespace *ns, int shmid, int cmd) |
| 1024 | { |
| 1025 | struct shmid_kernel *shp; |
| 1026 | struct file *shm_file; |
| 1027 | int err; |
| 1028 | |
| 1029 | rcu_read_lock(); |
| 1030 | shp = shm_obtain_object_check(ns, shmid); |
| 1031 | if (IS_ERR(shp)) { |
| 1032 | err = PTR_ERR(shp); |
| 1033 | goto out_unlock1; |
| 1034 | } |
| 1035 | |
| 1036 | audit_ipc_obj(&(shp->shm_perm)); |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 1037 | err = security_shm_shmctl(&shp->shm_perm, cmd); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1038 | if (err) |
| 1039 | goto out_unlock1; |
| 1040 | |
| 1041 | ipc_lock_object(&shp->shm_perm); |
| 1042 | |
| 1043 | /* check if shm_destroy() is tearing down shp */ |
| 1044 | if (!ipc_valid_object(&shp->shm_perm)) { |
| 1045 | err = -EIDRM; |
| 1046 | goto out_unlock0; |
| 1047 | } |
| 1048 | |
| 1049 | if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) { |
| 1050 | kuid_t euid = current_euid(); |
| 1051 | |
| 1052 | if (!uid_eq(euid, shp->shm_perm.uid) && |
| 1053 | !uid_eq(euid, shp->shm_perm.cuid)) { |
| 1054 | err = -EPERM; |
| 1055 | goto out_unlock0; |
| 1056 | } |
| 1057 | if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) { |
| 1058 | err = -EPERM; |
| 1059 | goto out_unlock0; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | shm_file = shp->shm_file; |
| 1064 | if (is_file_hugepages(shm_file)) |
| 1065 | goto out_unlock0; |
| 1066 | |
| 1067 | if (cmd == SHM_LOCK) { |
| 1068 | struct user_struct *user = current_user(); |
| 1069 | |
| 1070 | err = shmem_lock(shm_file, 1, user); |
| 1071 | if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) { |
| 1072 | shp->shm_perm.mode |= SHM_LOCKED; |
| 1073 | shp->mlock_user = user; |
| 1074 | } |
| 1075 | goto out_unlock0; |
| 1076 | } |
| 1077 | |
| 1078 | /* SHM_UNLOCK */ |
| 1079 | if (!(shp->shm_perm.mode & SHM_LOCKED)) |
| 1080 | goto out_unlock0; |
| 1081 | shmem_lock(shm_file, 0, shp->mlock_user); |
| 1082 | shp->shm_perm.mode &= ~SHM_LOCKED; |
| 1083 | shp->mlock_user = NULL; |
| 1084 | get_file(shm_file); |
| 1085 | ipc_unlock_object(&shp->shm_perm); |
| 1086 | rcu_read_unlock(); |
| 1087 | shmem_unlock_mapping(shm_file->f_mapping); |
| 1088 | |
| 1089 | fput(shm_file); |
| 1090 | return err; |
| 1091 | |
| 1092 | out_unlock0: |
| 1093 | ipc_unlock_object(&shp->shm_perm); |
| 1094 | out_unlock1: |
| 1095 | rcu_read_unlock(); |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1096 | return err; |
| 1097 | } |
| 1098 | |
Dominik Brodowski | c84d079 | 2018-03-20 20:12:33 +0100 | [diff] [blame] | 1099 | long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf) |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1100 | { |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1101 | int err, version; |
| 1102 | struct ipc_namespace *ns; |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1103 | struct shmid64_ds sem64; |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1104 | |
Davidlohr Bueso | 2caacaa | 2013-09-11 14:26:21 -0700 | [diff] [blame] | 1105 | if (cmd < 0 || shmid < 0) |
| 1106 | return -EINVAL; |
Davidlohr Bueso | 68eccc1 | 2013-09-11 14:26:18 -0700 | [diff] [blame] | 1107 | |
| 1108 | version = ipc_parse_version(&cmd); |
| 1109 | ns = current->nsproxy->ipc_ns; |
| 1110 | |
| 1111 | switch (cmd) { |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1112 | case IPC_INFO: { |
| 1113 | struct shminfo64 shminfo; |
| 1114 | err = shmctl_ipc_info(ns, &shminfo); |
| 1115 | if (err < 0) |
| 1116 | return err; |
| 1117 | if (copy_shminfo_to_user(buf, &shminfo, version)) |
| 1118 | err = -EFAULT; |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 1119 | return err; |
Davidlohr Bueso | 2caacaa | 2013-09-11 14:26:21 -0700 | [diff] [blame] | 1120 | } |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1121 | case SHM_INFO: { |
| 1122 | struct shm_info shm_info; |
| 1123 | err = shmctl_shm_info(ns, &shm_info); |
| 1124 | if (err < 0) |
| 1125 | return err; |
| 1126 | if (copy_to_user(buf, &shm_info, sizeof(shm_info))) |
| 1127 | err = -EFAULT; |
| 1128 | return err; |
| 1129 | } |
| 1130 | case SHM_STAT: |
Davidlohr Bueso | c21a697 | 2018-04-10 16:35:23 -0700 | [diff] [blame] | 1131 | case SHM_STAT_ANY: |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1132 | case IPC_STAT: { |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1133 | err = shmctl_stat(ns, shmid, cmd, &sem64); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1134 | if (err < 0) |
| 1135 | return err; |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1136 | if (copy_shmid_to_user(buf, &sem64, version)) |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1137 | err = -EFAULT; |
| 1138 | return err; |
| 1139 | } |
| 1140 | case IPC_SET: |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1141 | if (copy_shmid_from_user(&sem64, buf, version)) |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1142 | return -EFAULT; |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1143 | /* fallthru */ |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1144 | case IPC_RMID: |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1145 | return shmctl_down(ns, shmid, cmd, &sem64); |
Al Viro | 9ba720c | 2017-07-08 20:58:06 -0400 | [diff] [blame] | 1146 | case SHM_LOCK: |
| 1147 | case SHM_UNLOCK: |
| 1148 | return shmctl_do_lock(ns, shmid, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | default: |
Pierre Peiffer | 8d4cc8b | 2008-04-29 01:00:47 -0700 | [diff] [blame] | 1150 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
Dominik Brodowski | c84d079 | 2018-03-20 20:12:33 +0100 | [diff] [blame] | 1154 | SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) |
| 1155 | { |
| 1156 | return ksys_shmctl(shmid, cmd, buf); |
| 1157 | } |
| 1158 | |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1159 | #ifdef CONFIG_COMPAT |
| 1160 | |
| 1161 | struct compat_shmid_ds { |
| 1162 | struct compat_ipc_perm shm_perm; |
| 1163 | int shm_segsz; |
| 1164 | compat_time_t shm_atime; |
| 1165 | compat_time_t shm_dtime; |
| 1166 | compat_time_t shm_ctime; |
| 1167 | compat_ipc_pid_t shm_cpid; |
| 1168 | compat_ipc_pid_t shm_lpid; |
| 1169 | unsigned short shm_nattch; |
| 1170 | unsigned short shm_unused; |
| 1171 | compat_uptr_t shm_unused2; |
| 1172 | compat_uptr_t shm_unused3; |
| 1173 | }; |
| 1174 | |
| 1175 | struct compat_shminfo64 { |
| 1176 | compat_ulong_t shmmax; |
| 1177 | compat_ulong_t shmmin; |
| 1178 | compat_ulong_t shmmni; |
| 1179 | compat_ulong_t shmseg; |
| 1180 | compat_ulong_t shmall; |
| 1181 | compat_ulong_t __unused1; |
| 1182 | compat_ulong_t __unused2; |
| 1183 | compat_ulong_t __unused3; |
| 1184 | compat_ulong_t __unused4; |
| 1185 | }; |
| 1186 | |
| 1187 | struct compat_shm_info { |
| 1188 | compat_int_t used_ids; |
| 1189 | compat_ulong_t shm_tot, shm_rss, shm_swp; |
| 1190 | compat_ulong_t swap_attempts, swap_successes; |
| 1191 | }; |
| 1192 | |
| 1193 | static int copy_compat_shminfo_to_user(void __user *buf, struct shminfo64 *in, |
| 1194 | int version) |
| 1195 | { |
| 1196 | if (in->shmmax > INT_MAX) |
| 1197 | in->shmmax = INT_MAX; |
| 1198 | if (version == IPC_64) { |
| 1199 | struct compat_shminfo64 info; |
| 1200 | memset(&info, 0, sizeof(info)); |
| 1201 | info.shmmax = in->shmmax; |
| 1202 | info.shmmin = in->shmmin; |
| 1203 | info.shmmni = in->shmmni; |
| 1204 | info.shmseg = in->shmseg; |
| 1205 | info.shmall = in->shmall; |
| 1206 | return copy_to_user(buf, &info, sizeof(info)); |
| 1207 | } else { |
| 1208 | struct shminfo info; |
| 1209 | memset(&info, 0, sizeof(info)); |
| 1210 | info.shmmax = in->shmmax; |
| 1211 | info.shmmin = in->shmmin; |
| 1212 | info.shmmni = in->shmmni; |
| 1213 | info.shmseg = in->shmseg; |
| 1214 | info.shmall = in->shmall; |
| 1215 | return copy_to_user(buf, &info, sizeof(info)); |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | static int put_compat_shm_info(struct shm_info *ip, |
| 1220 | struct compat_shm_info __user *uip) |
| 1221 | { |
| 1222 | struct compat_shm_info info; |
| 1223 | |
| 1224 | memset(&info, 0, sizeof(info)); |
| 1225 | info.used_ids = ip->used_ids; |
| 1226 | info.shm_tot = ip->shm_tot; |
| 1227 | info.shm_rss = ip->shm_rss; |
| 1228 | info.shm_swp = ip->shm_swp; |
| 1229 | info.swap_attempts = ip->swap_attempts; |
| 1230 | info.swap_successes = ip->swap_successes; |
Al Viro | b776e4b | 2017-09-25 20:38:45 -0400 | [diff] [blame] | 1231 | return copy_to_user(uip, &info, sizeof(info)); |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1232 | } |
| 1233 | |
| 1234 | static int copy_compat_shmid_to_user(void __user *buf, struct shmid64_ds *in, |
| 1235 | int version) |
| 1236 | { |
| 1237 | if (version == IPC_64) { |
| 1238 | struct compat_shmid64_ds v; |
| 1239 | memset(&v, 0, sizeof(v)); |
Al Viro | 28327fa | 2017-07-09 10:10:32 -0400 | [diff] [blame] | 1240 | to_compat_ipc64_perm(&v.shm_perm, &in->shm_perm); |
Arnd Bergmann | c2ab975 | 2015-04-28 21:39:50 +0200 | [diff] [blame] | 1241 | v.shm_atime = lower_32_bits(in->shm_atime); |
| 1242 | v.shm_atime_high = upper_32_bits(in->shm_atime); |
| 1243 | v.shm_dtime = lower_32_bits(in->shm_dtime); |
| 1244 | v.shm_dtime_high = upper_32_bits(in->shm_dtime); |
| 1245 | v.shm_ctime = lower_32_bits(in->shm_ctime); |
| 1246 | v.shm_ctime_high = upper_32_bits(in->shm_ctime); |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1247 | v.shm_segsz = in->shm_segsz; |
| 1248 | v.shm_nattch = in->shm_nattch; |
| 1249 | v.shm_cpid = in->shm_cpid; |
| 1250 | v.shm_lpid = in->shm_lpid; |
| 1251 | return copy_to_user(buf, &v, sizeof(v)); |
| 1252 | } else { |
| 1253 | struct compat_shmid_ds v; |
| 1254 | memset(&v, 0, sizeof(v)); |
Al Viro | 28327fa | 2017-07-09 10:10:32 -0400 | [diff] [blame] | 1255 | to_compat_ipc_perm(&v.shm_perm, &in->shm_perm); |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1256 | v.shm_perm.key = in->shm_perm.key; |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1257 | v.shm_atime = in->shm_atime; |
| 1258 | v.shm_dtime = in->shm_dtime; |
| 1259 | v.shm_ctime = in->shm_ctime; |
| 1260 | v.shm_segsz = in->shm_segsz; |
| 1261 | v.shm_nattch = in->shm_nattch; |
| 1262 | v.shm_cpid = in->shm_cpid; |
| 1263 | v.shm_lpid = in->shm_lpid; |
| 1264 | return copy_to_user(buf, &v, sizeof(v)); |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | static int copy_compat_shmid_from_user(struct shmid64_ds *out, void __user *buf, |
| 1269 | int version) |
| 1270 | { |
| 1271 | memset(out, 0, sizeof(*out)); |
| 1272 | if (version == IPC_64) { |
Linus Torvalds | 6aa211e | 2017-09-25 18:37:28 -0700 | [diff] [blame] | 1273 | struct compat_shmid64_ds __user *p = buf; |
Al Viro | 28327fa | 2017-07-09 10:10:32 -0400 | [diff] [blame] | 1274 | return get_compat_ipc64_perm(&out->shm_perm, &p->shm_perm); |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1275 | } else { |
Linus Torvalds | 6aa211e | 2017-09-25 18:37:28 -0700 | [diff] [blame] | 1276 | struct compat_shmid_ds __user *p = buf; |
Al Viro | 28327fa | 2017-07-09 10:10:32 -0400 | [diff] [blame] | 1277 | return get_compat_ipc_perm(&out->shm_perm, &p->shm_perm); |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1278 | } |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1279 | } |
| 1280 | |
Dominik Brodowski | c84d079 | 2018-03-20 20:12:33 +0100 | [diff] [blame] | 1281 | long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr) |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1282 | { |
| 1283 | struct ipc_namespace *ns; |
| 1284 | struct shmid64_ds sem64; |
| 1285 | int version = compat_ipc_parse_version(&cmd); |
| 1286 | int err; |
| 1287 | |
| 1288 | ns = current->nsproxy->ipc_ns; |
| 1289 | |
| 1290 | if (cmd < 0 || shmid < 0) |
| 1291 | return -EINVAL; |
| 1292 | |
| 1293 | switch (cmd) { |
| 1294 | case IPC_INFO: { |
| 1295 | struct shminfo64 shminfo; |
| 1296 | err = shmctl_ipc_info(ns, &shminfo); |
| 1297 | if (err < 0) |
| 1298 | return err; |
| 1299 | if (copy_compat_shminfo_to_user(uptr, &shminfo, version)) |
| 1300 | err = -EFAULT; |
| 1301 | return err; |
| 1302 | } |
| 1303 | case SHM_INFO: { |
| 1304 | struct shm_info shm_info; |
| 1305 | err = shmctl_shm_info(ns, &shm_info); |
| 1306 | if (err < 0) |
| 1307 | return err; |
| 1308 | if (put_compat_shm_info(&shm_info, uptr)) |
| 1309 | err = -EFAULT; |
| 1310 | return err; |
| 1311 | } |
| 1312 | case IPC_STAT: |
Davidlohr Bueso | c21a697 | 2018-04-10 16:35:23 -0700 | [diff] [blame] | 1313 | case SHM_STAT_ANY: |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1314 | case SHM_STAT: |
| 1315 | err = shmctl_stat(ns, shmid, cmd, &sem64); |
| 1316 | if (err < 0) |
| 1317 | return err; |
Will Deacon | 58aff0a | 2017-09-18 17:47:38 +0100 | [diff] [blame] | 1318 | if (copy_compat_shmid_to_user(uptr, &sem64, version)) |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1319 | err = -EFAULT; |
| 1320 | return err; |
| 1321 | |
| 1322 | case IPC_SET: |
| 1323 | if (copy_compat_shmid_from_user(&sem64, uptr, version)) |
| 1324 | return -EFAULT; |
| 1325 | /* fallthru */ |
| 1326 | case IPC_RMID: |
| 1327 | return shmctl_down(ns, shmid, cmd, &sem64); |
| 1328 | case SHM_LOCK: |
| 1329 | case SHM_UNLOCK: |
| 1330 | return shmctl_do_lock(ns, shmid, cmd); |
| 1331 | break; |
| 1332 | default: |
| 1333 | return -EINVAL; |
| 1334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | return err; |
| 1336 | } |
Dominik Brodowski | c84d079 | 2018-03-20 20:12:33 +0100 | [diff] [blame] | 1337 | |
| 1338 | COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr) |
| 1339 | { |
| 1340 | return compat_ksys_shmctl(shmid, cmd, uptr); |
| 1341 | } |
Al Viro | 553f770 | 2017-07-08 22:52:47 -0400 | [diff] [blame] | 1342 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
| 1344 | /* |
| 1345 | * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. |
| 1346 | * |
| 1347 | * NOTE! Despite the name, this is NOT a direct system call entrypoint. The |
| 1348 | * "raddr" thing points to kernel space, and there has to be a wrapper around |
| 1349 | * this. |
| 1350 | */ |
Davidlohr Bueso | 95e91b8 | 2017-02-27 14:28:24 -0800 | [diff] [blame] | 1351 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, |
| 1352 | ulong *raddr, unsigned long shmlba) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | { |
| 1354 | struct shmid_kernel *shp; |
Davidlohr Bueso | f0cb880 | 2017-05-08 15:57:03 -0700 | [diff] [blame] | 1355 | unsigned long addr = (unsigned long)shmaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | unsigned long size; |
Manfred Spraul | 239521f | 2014-01-27 17:07:04 -0800 | [diff] [blame] | 1357 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | int err; |
Davidlohr Bueso | f0cb880 | 2017-05-08 15:57:03 -0700 | [diff] [blame] | 1359 | unsigned long flags = MAP_SHARED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | unsigned long prot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | int acc_mode; |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 1362 | struct ipc_namespace *ns; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1363 | struct shm_file_data *sfd; |
| 1364 | struct path path; |
Al Viro | c9c554f | 2018-07-11 14:19:04 -0400 | [diff] [blame^] | 1365 | int f_flags; |
Michel Lespinasse | 41badc1 | 2013-02-22 16:32:47 -0800 | [diff] [blame] | 1366 | unsigned long populate = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1368 | err = -EINVAL; |
| 1369 | if (shmid < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | goto out; |
Davidlohr Bueso | f0cb880 | 2017-05-08 15:57:03 -0700 | [diff] [blame] | 1371 | |
| 1372 | if (addr) { |
Will Deacon | 079a96a | 2012-07-30 14:42:38 -0700 | [diff] [blame] | 1373 | if (addr & (shmlba - 1)) { |
Davidlohr Bueso | 8f89c00 | 2018-05-25 14:47:30 -0700 | [diff] [blame] | 1374 | if (shmflg & SHM_RND) { |
Davidlohr Bueso | a73ab24 | 2018-05-25 14:47:27 -0700 | [diff] [blame] | 1375 | addr &= ~(shmlba - 1); /* round down */ |
Davidlohr Bueso | 8f89c00 | 2018-05-25 14:47:30 -0700 | [diff] [blame] | 1376 | |
| 1377 | /* |
| 1378 | * Ensure that the round-down is non-nil |
| 1379 | * when remapping. This can happen for |
| 1380 | * cases when addr < shmlba. |
| 1381 | */ |
| 1382 | if (!addr && (shmflg & SHM_REMAP)) |
| 1383 | goto out; |
| 1384 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | #ifndef __ARCH_FORCE_SHMLBA |
| 1386 | if (addr & ~PAGE_MASK) |
| 1387 | #endif |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1388 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
Davidlohr Bueso | f0cb880 | 2017-05-08 15:57:03 -0700 | [diff] [blame] | 1391 | flags |= MAP_FIXED; |
| 1392 | } else if ((shmflg & SHM_REMAP)) |
| 1393 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | |
| 1395 | if (shmflg & SHM_RDONLY) { |
| 1396 | prot = PROT_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | acc_mode = S_IRUGO; |
Al Viro | c9c554f | 2018-07-11 14:19:04 -0400 | [diff] [blame^] | 1398 | f_flags = O_RDONLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | } else { |
| 1400 | prot = PROT_READ | PROT_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | acc_mode = S_IRUGO | S_IWUGO; |
Al Viro | c9c554f | 2018-07-11 14:19:04 -0400 | [diff] [blame^] | 1402 | f_flags = O_RDWR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | } |
| 1404 | if (shmflg & SHM_EXEC) { |
| 1405 | prot |= PROT_EXEC; |
| 1406 | acc_mode |= S_IXUGO; |
| 1407 | } |
| 1408 | |
| 1409 | /* |
| 1410 | * We cannot rely on the fs check since SYSV IPC does have an |
| 1411 | * additional creator id... |
| 1412 | */ |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 1413 | ns = current->nsproxy->ipc_ns; |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 1414 | rcu_read_lock(); |
| 1415 | shp = shm_obtain_object_check(ns, shmid); |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 1416 | if (IS_ERR(shp)) { |
| 1417 | err = PTR_ERR(shp); |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 1418 | goto out_unlock; |
Nadia Derbey | 023a535 | 2007-10-18 23:40:51 -0700 | [diff] [blame] | 1419 | } |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1420 | |
| 1421 | err = -EACCES; |
Serge E. Hallyn | b0e7759 | 2011-03-23 16:43:24 -0700 | [diff] [blame] | 1422 | if (ipcperms(ns, &shp->shm_perm, acc_mode)) |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1423 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
Eric W. Biederman | 7191adf | 2018-03-22 21:08:27 -0500 | [diff] [blame] | 1425 | err = security_shm_shmat(&shp->shm_perm, shmaddr, shmflg); |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1426 | if (err) |
| 1427 | goto out_unlock; |
| 1428 | |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 1429 | ipc_lock_object(&shp->shm_perm); |
Greg Thelen | a399b29 | 2013-11-21 14:32:00 -0800 | [diff] [blame] | 1430 | |
| 1431 | /* check if shm_destroy() is tearing down shp */ |
Rafael Aquini | 0f3d2b0 | 2014-01-27 17:07:01 -0800 | [diff] [blame] | 1432 | if (!ipc_valid_object(&shp->shm_perm)) { |
Greg Thelen | a399b29 | 2013-11-21 14:32:00 -0800 | [diff] [blame] | 1433 | ipc_unlock_object(&shp->shm_perm); |
| 1434 | err = -EIDRM; |
| 1435 | goto out_unlock; |
| 1436 | } |
| 1437 | |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1438 | path = shp->shm_file->f_path; |
| 1439 | path_get(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | shp->shm_nattch++; |
David Howells | 75c3cfa | 2015-03-17 22:26:12 +0000 | [diff] [blame] | 1441 | size = i_size_read(d_inode(path.dentry)); |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 1442 | ipc_unlock_object(&shp->shm_perm); |
| 1443 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1445 | err = -ENOMEM; |
| 1446 | sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); |
Davidlohr Bueso | f42569b | 2013-09-11 14:26:22 -0700 | [diff] [blame] | 1447 | if (!sfd) { |
| 1448 | path_put(&path); |
| 1449 | goto out_nattch; |
| 1450 | } |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1451 | |
Al Viro | c9c554f | 2018-07-11 14:19:04 -0400 | [diff] [blame^] | 1452 | file = alloc_file(&path, f_flags, |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 1453 | is_file_hugepages(shp->shm_file) ? |
Al Viro | c4caa77 | 2009-11-30 08:38:43 -0500 | [diff] [blame] | 1454 | &shm_file_operations_huge : |
| 1455 | &shm_file_operations); |
Anatol Pomozov | 39b6525 | 2012-09-12 20:11:55 -0700 | [diff] [blame] | 1456 | err = PTR_ERR(file); |
Davidlohr Bueso | f42569b | 2013-09-11 14:26:22 -0700 | [diff] [blame] | 1457 | if (IS_ERR(file)) { |
| 1458 | kfree(sfd); |
| 1459 | path_put(&path); |
| 1460 | goto out_nattch; |
| 1461 | } |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1462 | |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1463 | file->private_data = sfd; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1464 | file->f_mapping = shp->shm_file->f_mapping; |
Nadia Derbey | 7ca7e56 | 2007-10-18 23:40:48 -0700 | [diff] [blame] | 1465 | sfd->id = shp->shm_perm.id; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1466 | sfd->ns = get_ipc_ns(ns); |
Eric Biggers | 3f05317 | 2018-04-13 15:35:30 -0700 | [diff] [blame] | 1467 | /* |
| 1468 | * We need to take a reference to the real shm file to prevent the |
| 1469 | * pointer from becoming stale in cases where the lifetime of the outer |
| 1470 | * file extends beyond that of the shm segment. It's not usually |
| 1471 | * possible, but it can happen during remap_file_pages() emulation as |
| 1472 | * that unmaps the memory, then does ->mmap() via file reference only. |
| 1473 | * We'll deny the ->mmap() if the shm segment was since removed, but to |
| 1474 | * detect shm ID reuse we need to compare the file pointers. |
| 1475 | */ |
| 1476 | sfd->file = get_file(shp->shm_file); |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1477 | sfd->vm_ops = NULL; |
| 1478 | |
Al Viro | 8b3ec68 | 2012-05-30 17:11:23 -0400 | [diff] [blame] | 1479 | err = security_mmap_file(file, prot, flags); |
| 1480 | if (err) |
| 1481 | goto out_fput; |
| 1482 | |
Michal Hocko | 91f4f94 | 2016-05-23 16:25:51 -0700 | [diff] [blame] | 1483 | if (down_write_killable(¤t->mm->mmap_sem)) { |
| 1484 | err = -EINTR; |
| 1485 | goto out_fput; |
| 1486 | } |
| 1487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | if (addr && !(shmflg & SHM_REMAP)) { |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1489 | err = -EINVAL; |
Manfred Spraul | 247a8ce | 2014-06-06 14:37:38 -0700 | [diff] [blame] | 1490 | if (addr + size < addr) |
| 1491 | goto invalid; |
| 1492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | if (find_vma_intersection(current->mm, addr, addr + size)) |
| 1494 | goto invalid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | } |
Davidlohr Bueso | f42569b | 2013-09-11 14:26:22 -0700 | [diff] [blame] | 1496 | |
Mike Rapoport | 897ab3e | 2017-02-24 14:58:22 -0800 | [diff] [blame] | 1497 | addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate, NULL); |
Michel Lespinasse | bebeb3d | 2013-02-22 16:32:37 -0800 | [diff] [blame] | 1498 | *raddr = addr; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1499 | err = 0; |
Michel Lespinasse | bebeb3d | 2013-02-22 16:32:37 -0800 | [diff] [blame] | 1500 | if (IS_ERR_VALUE(addr)) |
| 1501 | err = (long)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | invalid: |
| 1503 | up_write(¤t->mm->mmap_sem); |
Michel Lespinasse | bebeb3d | 2013-02-22 16:32:37 -0800 | [diff] [blame] | 1504 | if (populate) |
Michel Lespinasse | 41badc1 | 2013-02-22 16:32:47 -0800 | [diff] [blame] | 1505 | mm_populate(addr, populate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
Al Viro | 8b3ec68 | 2012-05-30 17:11:23 -0400 | [diff] [blame] | 1507 | out_fput: |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1508 | fput(file); |
| 1509 | |
| 1510 | out_nattch: |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 1511 | down_write(&shm_ids(ns).rwsem); |
Nadia Derbey | 00c2bf8 | 2008-07-25 01:48:03 -0700 | [diff] [blame] | 1512 | shp = shm_lock(ns, shmid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | shp->shm_nattch--; |
Vasiliy Kulikov | b34a6b1 | 2011-07-26 16:08:48 -0700 | [diff] [blame] | 1514 | if (shm_may_destroy(ns, shp)) |
Kirill Korotaev | 4e98231 | 2006-10-02 02:18:22 -0700 | [diff] [blame] | 1515 | shm_destroy(ns, shp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | else |
| 1517 | shm_unlock(shp); |
Davidlohr Bueso | d9a605e | 2013-09-11 14:26:24 -0700 | [diff] [blame] | 1518 | up_write(&shm_ids(ns).rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | return err; |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1520 | |
| 1521 | out_unlock: |
Davidlohr Bueso | c2c737a | 2013-09-11 14:26:23 -0700 | [diff] [blame] | 1522 | rcu_read_unlock(); |
Davidlohr Bueso | f42569b | 2013-09-11 14:26:22 -0700 | [diff] [blame] | 1523 | out: |
| 1524 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | } |
| 1526 | |
Heiko Carstens | d5460c9 | 2009-01-14 14:14:27 +0100 | [diff] [blame] | 1527 | SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg) |
Stephen Rothwell | 7d87e14c | 2005-05-01 08:59:12 -0700 | [diff] [blame] | 1528 | { |
| 1529 | unsigned long ret; |
| 1530 | long err; |
| 1531 | |
Will Deacon | 079a96a | 2012-07-30 14:42:38 -0700 | [diff] [blame] | 1532 | err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); |
Stephen Rothwell | 7d87e14c | 2005-05-01 08:59:12 -0700 | [diff] [blame] | 1533 | if (err) |
| 1534 | return err; |
| 1535 | force_successful_syscall_return(); |
| 1536 | return (long)ret; |
| 1537 | } |
| 1538 | |
Al Viro | a78ee9e | 2017-07-09 10:38:28 -0400 | [diff] [blame] | 1539 | #ifdef CONFIG_COMPAT |
| 1540 | |
| 1541 | #ifndef COMPAT_SHMLBA |
| 1542 | #define COMPAT_SHMLBA SHMLBA |
| 1543 | #endif |
| 1544 | |
| 1545 | COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) |
| 1546 | { |
| 1547 | unsigned long ret; |
| 1548 | long err; |
| 1549 | |
| 1550 | err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA); |
| 1551 | if (err) |
| 1552 | return err; |
| 1553 | force_successful_syscall_return(); |
| 1554 | return (long)ret; |
| 1555 | } |
| 1556 | #endif |
| 1557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | /* |
| 1559 | * detach and kill segment if marked destroyed. |
| 1560 | * The work is done in shm_close. |
| 1561 | */ |
Dominik Brodowski | da1e2744 | 2018-03-20 20:09:48 +0100 | [diff] [blame] | 1562 | long ksys_shmdt(char __user *shmaddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | { |
| 1564 | struct mm_struct *mm = current->mm; |
Mike Frysinger | 586c7e6 | 2009-06-09 16:26:23 -0700 | [diff] [blame] | 1565 | struct vm_area_struct *vma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | unsigned long addr = (unsigned long)shmaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | int retval = -EINVAL; |
Mike Frysinger | 586c7e6 | 2009-06-09 16:26:23 -0700 | [diff] [blame] | 1568 | #ifdef CONFIG_MMU |
| 1569 | loff_t size = 0; |
Dave Hansen | d3c9790 | 2014-12-12 16:58:19 -0800 | [diff] [blame] | 1570 | struct file *file; |
Mike Frysinger | 586c7e6 | 2009-06-09 16:26:23 -0700 | [diff] [blame] | 1571 | struct vm_area_struct *next; |
| 1572 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | |
Hugh Dickins | df1e2fb | 2006-03-24 03:18:06 -0800 | [diff] [blame] | 1574 | if (addr & ~PAGE_MASK) |
| 1575 | return retval; |
| 1576 | |
Michal Hocko | 91f4f94 | 2016-05-23 16:25:51 -0700 | [diff] [blame] | 1577 | if (down_write_killable(&mm->mmap_sem)) |
| 1578 | return -EINTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | |
| 1580 | /* |
| 1581 | * This function tries to be smart and unmap shm segments that |
| 1582 | * were modified by partial mlock or munmap calls: |
| 1583 | * - It first determines the size of the shm segment that should be |
| 1584 | * unmapped: It searches for a vma that is backed by shm and that |
| 1585 | * started at address shmaddr. It records it's size and then unmaps |
| 1586 | * it. |
| 1587 | * - Then it unmaps all shm vmas that started at shmaddr and that |
Dave Hansen | d3c9790 | 2014-12-12 16:58:19 -0800 | [diff] [blame] | 1588 | * are within the initially determined size and that are from the |
| 1589 | * same shm segment from which we determined the size. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | * Errors from do_munmap are ignored: the function only fails if |
| 1591 | * it's called with invalid parameters or if it's called to unmap |
| 1592 | * a part of a vma. Both calls in this function are for full vmas, |
| 1593 | * the parameters are directly copied from the vma itself and always |
| 1594 | * valid - therefore do_munmap cannot fail. (famous last words?) |
| 1595 | */ |
| 1596 | /* |
| 1597 | * If it had been mremap()'d, the starting address would not |
| 1598 | * match the usual checks anyway. So assume all vma's are |
| 1599 | * above the starting address given. |
| 1600 | */ |
| 1601 | vma = find_vma(mm, addr); |
| 1602 | |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1603 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | while (vma) { |
| 1605 | next = vma->vm_next; |
| 1606 | |
| 1607 | /* |
| 1608 | * Check if the starting address would match, i.e. it's |
| 1609 | * a fragment created by mprotect() and/or munmap(), or it |
| 1610 | * otherwise it starts at this address with no hassles. |
| 1611 | */ |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1612 | if ((vma->vm_ops == &shm_vm_ops) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
| 1614 | |
Dave Hansen | d3c9790 | 2014-12-12 16:58:19 -0800 | [diff] [blame] | 1615 | /* |
| 1616 | * Record the file of the shm segment being |
| 1617 | * unmapped. With mremap(), someone could place |
| 1618 | * page from another segment but with equal offsets |
| 1619 | * in the range we are unmapping. |
| 1620 | */ |
| 1621 | file = vma->vm_file; |
Dave Hansen | 07a46ed | 2014-12-12 16:58:22 -0800 | [diff] [blame] | 1622 | size = i_size_read(file_inode(vma->vm_file)); |
Mike Rapoport | 897ab3e | 2017-02-24 14:58:22 -0800 | [diff] [blame] | 1623 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | /* |
| 1625 | * We discovered the size of the shm segment, so |
| 1626 | * break out of here and fall through to the next |
| 1627 | * loop that uses the size information to stop |
| 1628 | * searching for matching vma's. |
| 1629 | */ |
| 1630 | retval = 0; |
| 1631 | vma = next; |
| 1632 | break; |
| 1633 | } |
| 1634 | vma = next; |
| 1635 | } |
| 1636 | |
| 1637 | /* |
| 1638 | * We need look no further than the maximum address a fragment |
| 1639 | * could possibly have landed at. Also cast things to loff_t to |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1640 | * prevent overflows and make comparisons vs. equal-width types. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | */ |
KAMEZAWA Hiroyuki | 8e36709 | 2006-02-10 01:51:12 -0800 | [diff] [blame] | 1642 | size = PAGE_ALIGN(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | while (vma && (loff_t)(vma->vm_end - addr) <= size) { |
| 1644 | next = vma->vm_next; |
| 1645 | |
| 1646 | /* finding a matching vma now does not alter retval */ |
Eric W. Biederman | bc56bba | 2007-02-20 13:57:53 -0800 | [diff] [blame] | 1647 | if ((vma->vm_ops == &shm_vm_ops) && |
Dave Hansen | d3c9790 | 2014-12-12 16:58:19 -0800 | [diff] [blame] | 1648 | ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) && |
| 1649 | (vma->vm_file == file)) |
Mike Rapoport | 897ab3e | 2017-02-24 14:58:22 -0800 | [diff] [blame] | 1650 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | vma = next; |
| 1652 | } |
| 1653 | |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 1654 | #else /* CONFIG_MMU */ |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1655 | /* under NOMMU conditions, the exact address to be destroyed must be |
Shailesh Pandey | 63980c8 | 2016-12-14 15:06:10 -0800 | [diff] [blame] | 1656 | * given |
| 1657 | */ |
Davidlohr Bueso | 530fcd16 | 2013-09-11 14:26:28 -0700 | [diff] [blame] | 1658 | if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { |
Mike Rapoport | 897ab3e | 2017-02-24 14:58:22 -0800 | [diff] [blame] | 1659 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL); |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1660 | retval = 0; |
| 1661 | } |
| 1662 | |
| 1663 | #endif |
| 1664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | up_write(&mm->mmap_sem); |
| 1666 | return retval; |
| 1667 | } |
| 1668 | |
Dominik Brodowski | da1e2744 | 2018-03-20 20:09:48 +0100 | [diff] [blame] | 1669 | SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) |
| 1670 | { |
| 1671 | return ksys_shmdt(shmaddr); |
| 1672 | } |
| 1673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | #ifdef CONFIG_PROC_FS |
Mike Waychison | 19b4946 | 2005-09-06 15:17:10 -0700 | [diff] [blame] | 1675 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | { |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 1677 | struct pid_namespace *pid_ns = ipc_seq_pid_ns(s); |
Eric W. Biederman | 1efdb69 | 2012-02-07 16:54:11 -0800 | [diff] [blame] | 1678 | struct user_namespace *user_ns = seq_user_ns(s); |
Kees Cook | ade9f91 | 2017-08-02 13:32:21 -0700 | [diff] [blame] | 1679 | struct kern_ipc_perm *ipcp = it; |
| 1680 | struct shmid_kernel *shp; |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 1681 | unsigned long rss = 0, swp = 0; |
| 1682 | |
Kees Cook | ade9f91 | 2017-08-02 13:32:21 -0700 | [diff] [blame] | 1683 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
Helge Deller | b795218 | 2010-10-27 15:34:16 -0700 | [diff] [blame] | 1684 | shm_add_rss_swap(shp, &rss, &swp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | |
Paul Menage | 6c82681 | 2008-06-12 15:21:49 -0700 | [diff] [blame] | 1686 | #if BITS_PER_LONG <= 32 |
| 1687 | #define SIZE_SPEC "%10lu" |
| 1688 | #else |
| 1689 | #define SIZE_SPEC "%21lu" |
| 1690 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | |
Joe Perches | 7f032d6 | 2015-04-15 16:17:54 -0700 | [diff] [blame] | 1692 | seq_printf(s, |
| 1693 | "%10d %10d %4o " SIZE_SPEC " %5u %5u " |
Deepa Dinamani | 7ff2819 | 2017-08-02 19:51:14 -0700 | [diff] [blame] | 1694 | "%5lu %5u %5u %5u %5u %10llu %10llu %10llu " |
Joe Perches | 7f032d6 | 2015-04-15 16:17:54 -0700 | [diff] [blame] | 1695 | SIZE_SPEC " " SIZE_SPEC "\n", |
| 1696 | shp->shm_perm.key, |
| 1697 | shp->shm_perm.id, |
| 1698 | shp->shm_perm.mode, |
| 1699 | shp->shm_segsz, |
Eric W. Biederman | 98f929b | 2018-03-23 00:29:57 -0500 | [diff] [blame] | 1700 | pid_nr_ns(shp->shm_cprid, pid_ns), |
| 1701 | pid_nr_ns(shp->shm_lprid, pid_ns), |
Joe Perches | 7f032d6 | 2015-04-15 16:17:54 -0700 | [diff] [blame] | 1702 | shp->shm_nattch, |
| 1703 | from_kuid_munged(user_ns, shp->shm_perm.uid), |
| 1704 | from_kgid_munged(user_ns, shp->shm_perm.gid), |
| 1705 | from_kuid_munged(user_ns, shp->shm_perm.cuid), |
| 1706 | from_kgid_munged(user_ns, shp->shm_perm.cgid), |
| 1707 | shp->shm_atim, |
| 1708 | shp->shm_dtim, |
| 1709 | shp->shm_ctim, |
| 1710 | rss * PAGE_SIZE, |
| 1711 | swp * PAGE_SIZE); |
| 1712 | |
| 1713 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | } |
| 1715 | #endif |