blob: c98787536bb888969c37afed2f0a5c5409098682 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
Pavel Macheka2531292010-07-18 14:27:13 +020011 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
Kevin Winchester85c9fe82010-08-09 17:20:22 -070018#include <linux/stddef.h>
Milind Arun Choudhary022a1692007-05-08 00:29:02 -070019#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/linkage.h>
21#include <linux/compat.h>
22#include <linux/errno.h>
23#include <linux/time.h>
24#include <linux/fs.h>
25#include <linux/fcntl.h>
26#include <linux/namei.h>
27#include <linux/file.h>
Al Viro9f3acc32008-04-24 07:44:08 -040028#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/vfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/ioctl.h>
31#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/ncp_mount.h>
David Howells9a9947b2005-04-18 10:54:51 -070033#include <linux/nfs4_mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/syscalls.h>
35#include <linux/ctype.h>
36#include <linux/module.h>
37#include <linux/dirent.h>
Robert Love0eeca282005-07-12 17:06:03 -040038#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/highuid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/personality.h>
41#include <linux/rwsem.h>
Jay Lan8f0ab512006-09-30 23:28:59 -070042#include <linux/tsacct_kern.h>
Christoph Hellwig6272e262007-05-08 00:29:21 -070043#include <linux/security.h>
Al Viroa1f8e7f2006-10-19 16:08:53 -040044#include <linux/highmem.h>
Davide Libenzi6d18c922007-05-10 22:23:15 -070045#include <linux/signal.h>
Al Virobd01f842006-10-19 17:23:57 -040046#include <linux/poll.h>
David S. Miller4a805e82005-09-14 21:40:00 -070047#include <linux/mm.h>
Davide Libenzif6dfb4f2007-03-07 20:41:21 -080048#include <linux/eventpoll.h>
Al Viro498052b2009-03-30 07:20:30 -040049#include <linux/fs_struct.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090050#include <linux/slab.h>
wu zhangjin504b7012010-10-30 08:19:35 -070051#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/uaccess.h>
54#include <asm/mmu_context.h>
55#include <asm/ioctls.h>
David Howells07f3f052006-09-30 20:52:18 +020056#include "internal.h"
David Woodhouse9f729492006-01-18 17:44:05 -080057
Andi Kleenbebfa102006-06-26 13:56:52 +020058int compat_log = 1;
59
60int compat_printk(const char *fmt, ...)
61{
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70}
71
Badari Pulavartyee0b3e62006-09-30 23:28:47 -070072#include "read_write.h"
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
David Howellsc7887322010-08-11 11:26:22 +010078asmlinkage long compat_sys_utime(const char __user *filename,
79 struct compat_utimbuf __user *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Ulrich Drepper1c710c82007-05-08 00:33:25 -070081 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 if (t) {
84 if (get_user(tv[0].tv_sec, &t->actime) ||
85 get_user(tv[1].tv_sec, &t->modtime))
86 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -070087 tv[0].tv_nsec = 0;
88 tv[1].tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -070090 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
91}
92
David Howellsc7887322010-08-11 11:26:22 +010093asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
Ulrich Drepper1c710c82007-05-08 00:33:25 -070094{
95 struct timespec tv[2];
96
97 if (t) {
98 if (get_compat_timespec(&tv[0], &t[0]) ||
99 get_compat_timespec(&tv[1], &t[1]))
100 return -EFAULT;
101
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700102 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
103 return 0;
104 }
105 return do_utimes(dfd, filename, t ? tv : NULL, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
David Howellsc7887322010-08-11 11:26:22 +0100108asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700110 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100112 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700114 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700116 get_user(tv[1].tv_nsec, &t[1].tv_usec))
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100117 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700118 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
119 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
120 return -EINVAL;
121 tv[0].tv_nsec *= 1000;
122 tv[1].tv_nsec *= 1000;
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100123 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700124 return do_utimes(dfd, filename, t ? tv : NULL, 0);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800125}
126
David Howellsc7887322010-08-11 11:26:22 +0100127asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800128{
129 return compat_sys_futimesat(AT_FDCWD, filename, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700132static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
133{
134 compat_ino_t ino = stat->ino;
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 int err;
138
139 SET_UID(uid, stat->uid);
140 SET_GID(gid, stat->gid);
141
142 if ((u64) stat->size > MAX_NON_LFS ||
143 !old_valid_dev(stat->dev) ||
144 !old_valid_dev(stat->rdev))
145 return -EOVERFLOW;
146 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
147 return -EOVERFLOW;
148
149 if (clear_user(ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
153 err |= __put_user(ino, &ubuf->st_ino);
154 err |= __put_user(stat->mode, &ubuf->st_mode);
155 err |= __put_user(stat->nlink, &ubuf->st_nlink);
156 err |= __put_user(uid, &ubuf->st_uid);
157 err |= __put_user(gid, &ubuf->st_gid);
158 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
159 err |= __put_user(stat->size, &ubuf->st_size);
160 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
161 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
162 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
163 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
164 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
165 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
166 err |= __put_user(stat->blksize, &ubuf->st_blksize);
167 err |= __put_user(stat->blocks, &ubuf->st_blocks);
168 return err;
169}
170
David Howellsc7887322010-08-11 11:26:22 +0100171asmlinkage long compat_sys_newstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 struct compat_stat __user *statbuf)
173{
174 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400175 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400177 error = vfs_stat(filename, &stat);
178 if (error)
179 return error;
180 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181}
182
David Howellsc7887322010-08-11 11:26:22 +0100183asmlinkage long compat_sys_newlstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 struct compat_stat __user *statbuf)
185{
186 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400187 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400189 error = vfs_lstat(filename, &stat);
190 if (error)
191 return error;
192 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Kyle McMartin82d821d2006-03-24 03:18:20 -0800195#ifndef __ARCH_WANT_STAT64
David Howellsc7887322010-08-11 11:26:22 +0100196asmlinkage long compat_sys_newfstatat(unsigned int dfd,
197 const char __user *filename,
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800198 struct compat_stat __user *statbuf, int flag)
199{
200 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400201 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800202
Oleg Drokin0112fc22009-04-08 20:05:42 +0400203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_compat_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800207}
Kyle McMartin82d821d2006-03-24 03:18:20 -0800208#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210asmlinkage long compat_sys_newfstat(unsigned int fd,
211 struct compat_stat __user * statbuf)
212{
213 struct kstat stat;
214 int error = vfs_fstat(fd, &stat);
215
216 if (!error)
217 error = cp_compat_stat(&stat, statbuf);
218 return error;
219}
220
221static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
222{
223
224 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700225 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
226 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return -EOVERFLOW;
228 /* f_files and f_ffree may be -1; it's okay
229 * to stuff that into 32 bits */
230 if (kbuf->f_files != 0xffffffffffffffffULL
231 && (kbuf->f_files & 0xffffffff00000000ULL))
232 return -EOVERFLOW;
233 if (kbuf->f_ffree != 0xffffffffffffffffULL
234 && (kbuf->f_ffree & 0xffffffff00000000ULL))
235 return -EOVERFLOW;
236 }
237 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
238 __put_user(kbuf->f_type, &ubuf->f_type) ||
239 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
240 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
241 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
242 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
243 __put_user(kbuf->f_files, &ubuf->f_files) ||
244 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
245 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
246 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
247 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
248 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
Eric W. Biederman1448c722011-10-17 13:40:02 -0700249 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
250 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 return -EFAULT;
252 return 0;
253}
254
255/*
Namhyung Kim974d8792010-12-27 01:41:53 +0900256 * The following statfs calls are copies of code from fs/statfs.c and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 * should be checked against those from time to time
258 */
Al Viro2d8f3032008-07-22 09:59:21 -0400259asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
Al Viroc8b91ac2011-03-12 10:41:39 -0500261 struct kstatfs tmp;
262 int error = user_statfs(pathname, &tmp);
263 if (!error)
264 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return error;
266}
267
268asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
269{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 struct kstatfs tmp;
Al Viroc8b91ac2011-03-12 10:41:39 -0500271 int error = fd_statfs(fd, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800272 if (!error)
273 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return error;
275}
276
277static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
278{
279 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700280 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
281 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return -EOVERFLOW;
283 /* f_files and f_ffree may be -1; it's okay
284 * to stuff that into 32 bits */
285 if (kbuf->f_files != 0xffffffffffffffffULL
286 && (kbuf->f_files & 0xffffffff00000000ULL))
287 return -EOVERFLOW;
288 if (kbuf->f_ffree != 0xffffffffffffffffULL
289 && (kbuf->f_ffree & 0xffffffff00000000ULL))
290 return -EOVERFLOW;
291 }
292 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
293 __put_user(kbuf->f_type, &ubuf->f_type) ||
294 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
295 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
296 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
297 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
298 __put_user(kbuf->f_files, &ubuf->f_files) ||
299 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
300 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
301 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
302 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
Namhyung Kime0bb6bd2010-12-27 01:41:54 +0900303 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
304 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
305 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return -EFAULT;
307 return 0;
308}
309
Al Viro2d8f3032008-07-22 09:59:21 -0400310asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 struct kstatfs tmp;
313 int error;
314
315 if (sz != sizeof(*buf))
316 return -EINVAL;
317
Al Viroc8b91ac2011-03-12 10:41:39 -0500318 error = user_statfs(pathname, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800319 if (!error)
320 error = put_compat_statfs64(buf, &tmp);
Al Viroc8b91ac2011-03-12 10:41:39 -0500321 return error;
322}
323
324asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
325{
326 struct kstatfs tmp;
327 int error;
328
329 if (sz != sizeof(*buf))
330 return -EINVAL;
331
332 error = fd_statfs(fd, &tmp);
333 if (!error)
334 error = put_compat_statfs64(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return error;
336}
337
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100338/*
339 * This is a copy of sys_ustat, just dealing with a structure layout.
340 * Given how simple this syscall is that apporach is more maintainable
341 * than the various conversion hacks.
342 */
343asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
344{
345 struct super_block *sb;
346 struct compat_ustat tmp;
347 struct kstatfs sbuf;
348 int err;
349
350 sb = user_get_super(new_decode_dev(dev));
351 if (!sb)
352 return -EINVAL;
Christoph Hellwigebabe9a2010-07-07 18:53:11 +0200353 err = statfs_by_dentry(sb->s_root, &sbuf);
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100354 drop_super(sb);
355 if (err)
356 return err;
357
358 memset(&tmp, 0, sizeof(struct compat_ustat));
359 tmp.f_tfree = sbuf.f_bfree;
360 tmp.f_tinode = sbuf.f_ffree;
361 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
362 return -EFAULT;
363 return 0;
364}
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
367{
368 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
369 __get_user(kfl->l_type, &ufl->l_type) ||
370 __get_user(kfl->l_whence, &ufl->l_whence) ||
371 __get_user(kfl->l_start, &ufl->l_start) ||
372 __get_user(kfl->l_len, &ufl->l_len) ||
373 __get_user(kfl->l_pid, &ufl->l_pid))
374 return -EFAULT;
375 return 0;
376}
377
378static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
379{
380 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
381 __put_user(kfl->l_type, &ufl->l_type) ||
382 __put_user(kfl->l_whence, &ufl->l_whence) ||
383 __put_user(kfl->l_start, &ufl->l_start) ||
384 __put_user(kfl->l_len, &ufl->l_len) ||
385 __put_user(kfl->l_pid, &ufl->l_pid))
386 return -EFAULT;
387 return 0;
388}
389
390#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
391static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
392{
393 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
394 __get_user(kfl->l_type, &ufl->l_type) ||
395 __get_user(kfl->l_whence, &ufl->l_whence) ||
396 __get_user(kfl->l_start, &ufl->l_start) ||
397 __get_user(kfl->l_len, &ufl->l_len) ||
398 __get_user(kfl->l_pid, &ufl->l_pid))
399 return -EFAULT;
400 return 0;
401}
402#endif
403
404#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
405static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
406{
407 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
408 __put_user(kfl->l_type, &ufl->l_type) ||
409 __put_user(kfl->l_whence, &ufl->l_whence) ||
410 __put_user(kfl->l_start, &ufl->l_start) ||
411 __put_user(kfl->l_len, &ufl->l_len) ||
412 __put_user(kfl->l_pid, &ufl->l_pid))
413 return -EFAULT;
414 return 0;
415}
416#endif
417
418asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
419 unsigned long arg)
420{
421 mm_segment_t old_fs;
422 struct flock f;
423 long ret;
424
425 switch (cmd) {
426 case F_GETLK:
427 case F_SETLK:
428 case F_SETLKW:
429 ret = get_compat_flock(&f, compat_ptr(arg));
430 if (ret != 0)
431 break;
432 old_fs = get_fs();
433 set_fs(KERNEL_DS);
434 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
435 set_fs(old_fs);
436 if (cmd == F_GETLK && ret == 0) {
Nikanth Karthikesanff677f82009-04-01 14:40:51 +0530437 /* GETLK was successful and we need to return the data...
NeilBrown2520f142006-01-08 01:02:40 -0800438 * but it needs to fit in the compat structure.
439 * l_start shouldn't be too big, unless the original
440 * start + end is greater than COMPAT_OFF_T_MAX, in which
441 * case the app was asking for trouble, so we return
442 * -EOVERFLOW in that case.
443 * l_len could be too big, in which case we just truncate it,
444 * and only allow the app to see that part of the conflicting
445 * lock that might make sense to it anyway
446 */
447
448 if (f.l_start > COMPAT_OFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800450 if (f.l_len > COMPAT_OFF_T_MAX)
451 f.l_len = COMPAT_OFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (ret == 0)
453 ret = put_compat_flock(&f, compat_ptr(arg));
454 }
455 break;
456
457 case F_GETLK64:
458 case F_SETLK64:
459 case F_SETLKW64:
460 ret = get_compat_flock64(&f, compat_ptr(arg));
461 if (ret != 0)
462 break;
463 old_fs = get_fs();
464 set_fs(KERNEL_DS);
465 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
466 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
467 (unsigned long)&f);
468 set_fs(old_fs);
469 if (cmd == F_GETLK64 && ret == 0) {
NeilBrown2520f142006-01-08 01:02:40 -0800470 /* need to return lock information - see above for commentary */
471 if (f.l_start > COMPAT_LOFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800473 if (f.l_len > COMPAT_LOFF_T_MAX)
474 f.l_len = COMPAT_LOFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (ret == 0)
476 ret = put_compat_flock64(&f, compat_ptr(arg));
477 }
478 break;
479
480 default:
481 ret = sys_fcntl(fd, cmd, arg);
482 break;
483 }
484 return ret;
485}
486
487asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
488 unsigned long arg)
489{
490 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
491 return -EINVAL;
492 return compat_sys_fcntl64(fd, cmd, arg);
493}
494
495asmlinkage long
496compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
497{
498 long ret;
499 aio_context_t ctx64;
500
501 mm_segment_t oldfs = get_fs();
502 if (unlikely(get_user(ctx64, ctx32p)))
503 return -EFAULT;
504
505 set_fs(KERNEL_DS);
506 /* The __user pointer cast is valid because of the set_fs() */
507 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
508 set_fs(oldfs);
509 /* truncating is ok because it's a user address */
510 if (!ret)
511 ret = put_user((u32) ctx64, ctx32p);
512 return ret;
513}
514
515asmlinkage long
516compat_sys_io_getevents(aio_context_t ctx_id,
517 unsigned long min_nr,
518 unsigned long nr,
519 struct io_event __user *events,
520 struct compat_timespec __user *timeout)
521{
522 long ret;
523 struct timespec t;
524 struct timespec __user *ut = NULL;
525
526 ret = -EFAULT;
527 if (unlikely(!access_ok(VERIFY_WRITE, events,
528 nr * sizeof(struct io_event))))
529 goto out;
530 if (timeout) {
531 if (get_compat_timespec(&t, timeout))
532 goto out;
533
534 ut = compat_alloc_user_space(sizeof(*ut));
535 if (copy_to_user(ut, &t, sizeof(t)) )
536 goto out;
537 }
538 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
539out:
540 return ret;
541}
542
Jeff Moyerb8373362010-05-26 14:44:25 -0700543/* A write operation does a read from user space and vice versa */
544#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
545
546ssize_t compat_rw_copy_check_uvector(int type,
547 const struct compat_iovec __user *uvector, unsigned long nr_segs,
548 unsigned long fast_segs, struct iovec *fast_pointer,
Christopher Yeohfcf63402011-10-31 17:06:39 -0700549 struct iovec **ret_pointer, int check_access)
Jeff Moyerb8373362010-05-26 14:44:25 -0700550{
551 compat_ssize_t tot_len;
552 struct iovec *iov = *ret_pointer = fast_pointer;
553 ssize_t ret = 0;
554 int seg;
555
556 /*
557 * SuS says "The readv() function *may* fail if the iovcnt argument
558 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
559 * traditionally returned zero for zero segments, so...
560 */
561 if (nr_segs == 0)
562 goto out;
563
564 ret = -EINVAL;
565 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
566 goto out;
567 if (nr_segs > fast_segs) {
568 ret = -ENOMEM;
569 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
Namhyung Kim6a5640f2010-12-27 01:41:52 +0900570 if (iov == NULL)
Jeff Moyerb8373362010-05-26 14:44:25 -0700571 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -0700572 }
573 *ret_pointer = iov;
574
575 /*
576 * Single unix specification:
577 * We should -EINVAL if an element length is not >= 0 and fitting an
Linus Torvalds435f49a2010-10-29 10:36:49 -0700578 * ssize_t.
Jeff Moyerb8373362010-05-26 14:44:25 -0700579 *
Linus Torvalds435f49a2010-10-29 10:36:49 -0700580 * In Linux, the total length is limited to MAX_RW_COUNT, there is
581 * no overflow possibility.
Jeff Moyerb8373362010-05-26 14:44:25 -0700582 */
583 tot_len = 0;
584 ret = -EINVAL;
585 for (seg = 0; seg < nr_segs; seg++) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700586 compat_uptr_t buf;
587 compat_ssize_t len;
588
589 if (__get_user(len, &uvector->iov_len) ||
590 __get_user(buf, &uvector->iov_base)) {
591 ret = -EFAULT;
592 goto out;
593 }
594 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
595 goto out;
Christopher Yeohfcf63402011-10-31 17:06:39 -0700596 if (check_access &&
597 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700598 ret = -EFAULT;
599 goto out;
600 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700601 if (len > MAX_RW_COUNT - tot_len)
602 len = MAX_RW_COUNT - tot_len;
603 tot_len += len;
Jeff Moyerb8373362010-05-26 14:44:25 -0700604 iov->iov_base = compat_ptr(buf);
605 iov->iov_len = (compat_size_t) len;
606 uvector++;
607 iov++;
608 }
609 ret = tot_len;
610
611out:
612 return ret;
613}
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615static inline long
616copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
617{
618 compat_uptr_t uptr;
619 int i;
620
621 for (i = 0; i < nr; ++i) {
622 if (get_user(uptr, ptr32 + i))
623 return -EFAULT;
624 if (put_user(compat_ptr(uptr), ptr64 + i))
625 return -EFAULT;
626 }
627 return 0;
628}
629
630#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
631
632asmlinkage long
633compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
634{
635 struct iocb __user * __user *iocb64;
636 long ret;
637
638 if (unlikely(nr < 0))
639 return -EINVAL;
640
641 if (nr > MAX_AIO_SUBMITS)
642 nr = MAX_AIO_SUBMITS;
643
644 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
645 ret = copy_iocb(nr, iocb, iocb64);
646 if (!ret)
Jeff Moyer9d85cba2010-05-26 14:44:26 -0700647 ret = do_io_submit(ctx_id, nr, iocb64, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 return ret;
649}
650
651struct compat_ncp_mount_data {
652 compat_int_t version;
653 compat_uint_t ncp_fd;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700654 __compat_uid_t mounted_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 compat_pid_t wdog_pid;
656 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
657 compat_uint_t time_out;
658 compat_uint_t retry_count;
659 compat_uint_t flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700660 __compat_uid_t uid;
661 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 compat_mode_t file_mode;
663 compat_mode_t dir_mode;
664};
665
666struct compat_ncp_mount_data_v4 {
667 compat_int_t version;
668 compat_ulong_t flags;
669 compat_ulong_t mounted_uid;
670 compat_long_t wdog_pid;
671 compat_uint_t ncp_fd;
672 compat_uint_t time_out;
673 compat_uint_t retry_count;
674 compat_ulong_t uid;
675 compat_ulong_t gid;
676 compat_ulong_t file_mode;
677 compat_ulong_t dir_mode;
678};
679
680static void *do_ncp_super_data_conv(void *raw_data)
681{
682 int version = *(unsigned int *)raw_data;
683
684 if (version == 3) {
685 struct compat_ncp_mount_data *c_n = raw_data;
686 struct ncp_mount_data *n = raw_data;
687
688 n->dir_mode = c_n->dir_mode;
689 n->file_mode = c_n->file_mode;
690 n->gid = c_n->gid;
691 n->uid = c_n->uid;
692 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
693 n->wdog_pid = c_n->wdog_pid;
694 n->mounted_uid = c_n->mounted_uid;
695 } else if (version == 4) {
696 struct compat_ncp_mount_data_v4 *c_n = raw_data;
697 struct ncp_mount_data_v4 *n = raw_data;
698
699 n->dir_mode = c_n->dir_mode;
700 n->file_mode = c_n->file_mode;
701 n->gid = c_n->gid;
702 n->uid = c_n->uid;
703 n->retry_count = c_n->retry_count;
704 n->time_out = c_n->time_out;
705 n->ncp_fd = c_n->ncp_fd;
706 n->wdog_pid = c_n->wdog_pid;
707 n->mounted_uid = c_n->mounted_uid;
708 n->flags = c_n->flags;
709 } else if (version != 5) {
710 return NULL;
711 }
712
713 return raw_data;
714}
715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
David Howells9a9947b2005-04-18 10:54:51 -0700717struct compat_nfs_string {
718 compat_uint_t len;
David Howells5fc3e622005-04-27 15:39:03 -0700719 compat_uptr_t data;
David Howells9a9947b2005-04-18 10:54:51 -0700720};
721
722static inline void compat_nfs_string(struct nfs_string *dst,
723 struct compat_nfs_string *src)
724{
725 dst->data = compat_ptr(src->data);
726 dst->len = src->len;
727}
728
729struct compat_nfs4_mount_data_v1 {
730 compat_int_t version;
731 compat_int_t flags;
732 compat_int_t rsize;
733 compat_int_t wsize;
734 compat_int_t timeo;
735 compat_int_t retrans;
736 compat_int_t acregmin;
737 compat_int_t acregmax;
738 compat_int_t acdirmin;
739 compat_int_t acdirmax;
740 struct compat_nfs_string client_addr;
741 struct compat_nfs_string mnt_path;
742 struct compat_nfs_string hostname;
743 compat_uint_t host_addrlen;
David Howells5fc3e622005-04-27 15:39:03 -0700744 compat_uptr_t host_addr;
David Howells9a9947b2005-04-18 10:54:51 -0700745 compat_int_t proto;
746 compat_int_t auth_flavourlen;
David Howells5fc3e622005-04-27 15:39:03 -0700747 compat_uptr_t auth_flavours;
David Howells9a9947b2005-04-18 10:54:51 -0700748};
749
750static int do_nfs4_super_data_conv(void *raw_data)
751{
752 int version = *(compat_uint_t *) raw_data;
753
754 if (version == 1) {
755 struct compat_nfs4_mount_data_v1 *raw = raw_data;
756 struct nfs4_mount_data *real = raw_data;
757
758 /* copy the fields backwards */
759 real->auth_flavours = compat_ptr(raw->auth_flavours);
760 real->auth_flavourlen = raw->auth_flavourlen;
761 real->proto = raw->proto;
762 real->host_addr = compat_ptr(raw->host_addr);
763 real->host_addrlen = raw->host_addrlen;
764 compat_nfs_string(&real->hostname, &raw->hostname);
765 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
766 compat_nfs_string(&real->client_addr, &raw->client_addr);
767 real->acdirmax = raw->acdirmax;
768 real->acdirmin = raw->acdirmin;
769 real->acregmax = raw->acregmax;
770 real->acregmin = raw->acregmin;
771 real->retrans = raw->retrans;
772 real->timeo = raw->timeo;
773 real->wsize = raw->wsize;
774 real->rsize = raw->rsize;
775 real->flags = raw->flags;
776 real->version = raw->version;
777 }
David Howells9a9947b2005-04-18 10:54:51 -0700778
779 return 0;
780}
781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782#define NCPFS_NAME "ncpfs"
David Howells9a9947b2005-04-18 10:54:51 -0700783#define NFS4_NAME "nfs4"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
David Howellsc7887322010-08-11 11:26:22 +0100785asmlinkage long compat_sys_mount(const char __user * dev_name,
786 const char __user * dir_name,
787 const char __user * type, unsigned long flags,
788 const void __user * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789{
Vegard Nossumeca6f532009-09-18 13:05:45 -0700790 char *kernel_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 unsigned long data_page;
Vegard Nossumeca6f532009-09-18 13:05:45 -0700792 char *kernel_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 char *dir_page;
794 int retval;
795
Vegard Nossumeca6f532009-09-18 13:05:45 -0700796 retval = copy_mount_string(type, &kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (retval < 0)
798 goto out;
799
800 dir_page = getname(dir_name);
801 retval = PTR_ERR(dir_page);
802 if (IS_ERR(dir_page))
803 goto out1;
804
Vegard Nossumeca6f532009-09-18 13:05:45 -0700805 retval = copy_mount_string(dev_name, &kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (retval < 0)
807 goto out2;
808
Vegard Nossumeca6f532009-09-18 13:05:45 -0700809 retval = copy_mount_options(data, &data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 if (retval < 0)
811 goto out3;
812
813 retval = -EINVAL;
814
Vegard Nossumeca6f532009-09-18 13:05:45 -0700815 if (kernel_type && data_page) {
Arnd Bergmann2116b7a2010-10-04 22:55:57 +0200816 if (!strcmp(kernel_type, NCPFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 do_ncp_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700818 } else if (!strcmp(kernel_type, NFS4_NAME)) {
David Howells9a9947b2005-04-18 10:54:51 -0700819 if (do_nfs4_super_data_conv((void *) data_page))
820 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 }
822 }
823
Vegard Nossumeca6f532009-09-18 13:05:45 -0700824 retval = do_mount(kernel_dev, dir_page, kernel_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 flags, (void*)data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
David Howells9a9947b2005-04-18 10:54:51 -0700827 out4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 free_page(data_page);
829 out3:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700830 kfree(kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 out2:
832 putname(dir_page);
833 out1:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700834 kfree(kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 out:
836 return retval;
837}
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839struct compat_old_linux_dirent {
840 compat_ulong_t d_ino;
841 compat_ulong_t d_offset;
842 unsigned short d_namlen;
843 char d_name[1];
844};
845
846struct compat_readdir_callback {
847 struct compat_old_linux_dirent __user *dirent;
848 int result;
849};
850
851static int compat_fillonedir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700852 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
854 struct compat_readdir_callback *buf = __buf;
855 struct compat_old_linux_dirent __user *dirent;
David Howellsafefdbb2006-10-03 01:13:46 -0700856 compat_ulong_t d_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 if (buf->result)
859 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700860 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400861 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
862 buf->result = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700863 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400864 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 buf->result++;
866 dirent = buf->dirent;
867 if (!access_ok(VERIFY_WRITE, dirent,
868 (unsigned long)(dirent->d_name + namlen + 1) -
869 (unsigned long)dirent))
870 goto efault;
David Howellsafefdbb2006-10-03 01:13:46 -0700871 if ( __put_user(d_ino, &dirent->d_ino) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 __put_user(offset, &dirent->d_offset) ||
873 __put_user(namlen, &dirent->d_namlen) ||
874 __copy_to_user(dirent->d_name, name, namlen) ||
875 __put_user(0, dirent->d_name + namlen))
876 goto efault;
877 return 0;
878efault:
879 buf->result = -EFAULT;
880 return -EFAULT;
881}
882
883asmlinkage long compat_sys_old_readdir(unsigned int fd,
884 struct compat_old_linux_dirent __user *dirent, unsigned int count)
885{
886 int error;
887 struct file *file;
888 struct compat_readdir_callback buf;
889
890 error = -EBADF;
891 file = fget(fd);
892 if (!file)
893 goto out;
894
895 buf.result = 0;
896 buf.dirent = dirent;
897
898 error = vfs_readdir(file, compat_fillonedir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400899 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 error = buf.result;
901
902 fput(file);
903out:
904 return error;
905}
906
907struct compat_linux_dirent {
908 compat_ulong_t d_ino;
909 compat_ulong_t d_off;
910 unsigned short d_reclen;
911 char d_name[1];
912};
913
914struct compat_getdents_callback {
915 struct compat_linux_dirent __user *current_dir;
916 struct compat_linux_dirent __user *previous;
917 int count;
918 int error;
919};
920
921static int compat_filldir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700922 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923{
924 struct compat_linux_dirent __user * dirent;
925 struct compat_getdents_callback *buf = __buf;
David Howellsafefdbb2006-10-03 01:13:46 -0700926 compat_ulong_t d_ino;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700927 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
928 namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
930 buf->error = -EINVAL; /* only used if we fail.. */
931 if (reclen > buf->count)
932 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700933 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400934 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
935 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700936 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400937 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 dirent = buf->previous;
939 if (dirent) {
940 if (__put_user(offset, &dirent->d_off))
941 goto efault;
942 }
943 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700944 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 goto efault;
946 if (__put_user(reclen, &dirent->d_reclen))
947 goto efault;
948 if (copy_to_user(dirent->d_name, name, namlen))
949 goto efault;
950 if (__put_user(0, dirent->d_name + namlen))
951 goto efault;
952 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
953 goto efault;
954 buf->previous = dirent;
955 dirent = (void __user *)dirent + reclen;
956 buf->current_dir = dirent;
957 buf->count -= reclen;
958 return 0;
959efault:
960 buf->error = -EFAULT;
961 return -EFAULT;
962}
963
964asmlinkage long compat_sys_getdents(unsigned int fd,
965 struct compat_linux_dirent __user *dirent, unsigned int count)
966{
967 struct file * file;
968 struct compat_linux_dirent __user * lastdirent;
969 struct compat_getdents_callback buf;
970 int error;
971
972 error = -EFAULT;
973 if (!access_ok(VERIFY_WRITE, dirent, count))
974 goto out;
975
976 error = -EBADF;
977 file = fget(fd);
978 if (!file)
979 goto out;
980
981 buf.current_dir = dirent;
982 buf.previous = NULL;
983 buf.count = count;
984 buf.error = 0;
985
986 error = vfs_readdir(file, compat_filldir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400987 if (error >= 0)
988 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 lastdirent = buf.previous;
990 if (lastdirent) {
991 if (put_user(file->f_pos, &lastdirent->d_off))
992 error = -EFAULT;
993 else
994 error = count - buf.count;
995 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 fput(file);
997out:
998 return error;
999}
1000
1001#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
1003struct compat_getdents_callback64 {
1004 struct linux_dirent64 __user *current_dir;
1005 struct linux_dirent64 __user *previous;
1006 int count;
1007 int error;
1008};
1009
1010static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
David Howellsafefdbb2006-10-03 01:13:46 -07001011 u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012{
1013 struct linux_dirent64 __user *dirent;
1014 struct compat_getdents_callback64 *buf = __buf;
Kevin Winchester85c9fe82010-08-09 17:20:22 -07001015 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1016 sizeof(u64));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 u64 off;
1018
1019 buf->error = -EINVAL; /* only used if we fail.. */
1020 if (reclen > buf->count)
1021 return -EINVAL;
1022 dirent = buf->previous;
1023
1024 if (dirent) {
1025 if (__put_user_unaligned(offset, &dirent->d_off))
1026 goto efault;
1027 }
1028 dirent = buf->current_dir;
1029 if (__put_user_unaligned(ino, &dirent->d_ino))
1030 goto efault;
1031 off = 0;
1032 if (__put_user_unaligned(off, &dirent->d_off))
1033 goto efault;
1034 if (__put_user(reclen, &dirent->d_reclen))
1035 goto efault;
1036 if (__put_user(d_type, &dirent->d_type))
1037 goto efault;
1038 if (copy_to_user(dirent->d_name, name, namlen))
1039 goto efault;
1040 if (__put_user(0, dirent->d_name + namlen))
1041 goto efault;
1042 buf->previous = dirent;
1043 dirent = (void __user *)dirent + reclen;
1044 buf->current_dir = dirent;
1045 buf->count -= reclen;
1046 return 0;
1047efault:
1048 buf->error = -EFAULT;
1049 return -EFAULT;
1050}
1051
1052asmlinkage long compat_sys_getdents64(unsigned int fd,
1053 struct linux_dirent64 __user * dirent, unsigned int count)
1054{
1055 struct file * file;
1056 struct linux_dirent64 __user * lastdirent;
1057 struct compat_getdents_callback64 buf;
1058 int error;
1059
1060 error = -EFAULT;
1061 if (!access_ok(VERIFY_WRITE, dirent, count))
1062 goto out;
1063
1064 error = -EBADF;
1065 file = fget(fd);
1066 if (!file)
1067 goto out;
1068
1069 buf.current_dir = dirent;
1070 buf.previous = NULL;
1071 buf.count = count;
1072 buf.error = 0;
1073
1074 error = vfs_readdir(file, compat_filldir64, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -04001075 if (error >= 0)
1076 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 lastdirent = buf.previous;
1078 if (lastdirent) {
1079 typeof(lastdirent->d_off) d_off = file->f_pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001080 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001081 error = -EFAULT;
1082 else
1083 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 fput(file);
1086out:
1087 return error;
1088}
1089#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1090
1091static ssize_t compat_do_readv_writev(int type, struct file *file,
1092 const struct compat_iovec __user *uvector,
1093 unsigned long nr_segs, loff_t *pos)
1094{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 compat_ssize_t tot_len;
1096 struct iovec iovstack[UIO_FASTIOV];
Dan Rosenberg767b68e2010-09-22 14:32:56 -04001097 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 io_fn_t fn;
1100 iov_fn_t fnv;
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 if (!file->f_op)
1104 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -07001105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 ret = -EFAULT;
1107 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1108 goto out;
1109
Jeff Moyerb8373362010-05-26 14:44:25 -07001110 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
Christopher Yeohfcf63402011-10-31 17:06:39 -07001111 UIO_FASTIOV, iovstack, &iov, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 if (tot_len == 0) {
1113 ret = 0;
1114 goto out;
1115 }
1116
1117 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001118 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 goto out;
1120
1121 fnv = NULL;
1122 if (type == READ) {
1123 fn = file->f_op->read;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001124 fnv = file->f_op->aio_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 } else {
1126 fn = (io_fn_t)file->f_op->write;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001127 fnv = file->f_op->aio_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 }
1129
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001130 if (fnv)
1131 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1132 pos, fnv);
1133 else
1134 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136out:
1137 if (iov != iovstack)
1138 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -04001139 if ((ret + (type == READ)) > 0) {
Robert Love0eeca282005-07-12 17:06:03 -04001140 if (type == READ)
Eric Paris2a12a9d2009-12-17 21:24:21 -05001141 fsnotify_access(file);
Robert Love0eeca282005-07-12 17:06:03 -04001142 else
Eric Paris2a12a9d2009-12-17 21:24:21 -05001143 fsnotify_modify(file);
Robert Love0eeca282005-07-12 17:06:03 -04001144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 return ret;
1146}
1147
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001148static size_t compat_readv(struct file *file,
1149 const struct compat_iovec __user *vec,
1150 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 ssize_t ret = -EBADF;
1153
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 if (!(file->f_mode & FMODE_READ))
1155 goto out;
1156
1157 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001158 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 goto out;
1160
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001161 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001164 if (ret > 0)
1165 add_rchar(current, ret);
1166 inc_syscr(current);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001167 return ret;
1168}
1169
1170asmlinkage ssize_t
1171compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1172 unsigned long vlen)
1173{
1174 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001175 int fput_needed;
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001176 ssize_t ret;
1177
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001178 file = fget_light(fd, &fput_needed);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001179 if (!file)
1180 return -EBADF;
1181 ret = compat_readv(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001182 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return ret;
1184}
1185
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001186asmlinkage ssize_t
1187compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001188 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001189{
1190 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1191 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001192 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001193 ssize_t ret;
1194
1195 if (pos < 0)
1196 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001197 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001198 if (!file)
1199 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001200 ret = -ESPIPE;
1201 if (file->f_mode & FMODE_PREAD)
1202 ret = compat_readv(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001203 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001204 return ret;
1205}
1206
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001207static size_t compat_writev(struct file *file,
1208 const struct compat_iovec __user *vec,
1209 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 ssize_t ret = -EBADF;
1212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (!(file->f_mode & FMODE_WRITE))
1214 goto out;
1215
1216 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001217 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 goto out;
1219
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001220 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
1222out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001223 if (ret > 0)
1224 add_wchar(current, ret);
1225 inc_syscw(current);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001226 return ret;
1227}
1228
1229asmlinkage ssize_t
1230compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1231 unsigned long vlen)
1232{
1233 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001234 int fput_needed;
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001235 ssize_t ret;
1236
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001237 file = fget_light(fd, &fput_needed);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001238 if (!file)
1239 return -EBADF;
1240 ret = compat_writev(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001241 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 return ret;
1243}
1244
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001245asmlinkage ssize_t
1246compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001247 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001248{
1249 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1250 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001251 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001252 ssize_t ret;
1253
1254 if (pos < 0)
1255 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001256 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001257 if (!file)
1258 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001259 ret = -ESPIPE;
1260 if (file->f_mode & FMODE_PWRITE)
1261 ret = compat_writev(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001262 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001263 return ret;
1264}
1265
Andi Kleend2610202006-05-01 12:15:48 -07001266asmlinkage long
1267compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1268 unsigned int nr_segs, unsigned int flags)
1269{
1270 unsigned i;
Al Viro90cbad62006-10-10 22:44:17 +01001271 struct iovec __user *iov;
Jens Axboe98232d52006-05-04 09:13:49 +02001272 if (nr_segs > UIO_MAXIOV)
Andi Kleend2610202006-05-01 12:15:48 -07001273 return -EINVAL;
1274 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1275 for (i = 0; i < nr_segs; i++) {
1276 struct compat_iovec v;
1277 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1278 get_user(v.iov_len, &iov32[i].iov_len) ||
1279 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1280 put_user(v.iov_len, &iov[i].iov_len))
1281 return -EFAULT;
1282 }
1283 return sys_vmsplice(fd, iov, nr_segs, flags);
1284}
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001287 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1288 * O_LARGEFILE flag.
1289 */
1290asmlinkage long
1291compat_sys_open(const char __user *filename, int flags, int mode)
1292{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001293 return do_sys_open(AT_FDCWD, filename, flags, mode);
1294}
1295
1296/*
1297 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1298 * O_LARGEFILE flag.
1299 */
1300asmlinkage long
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +11001301compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001302{
1303 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001304}
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1307
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001308static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1309 int timeval, int ret)
1310{
1311 struct timespec ts;
1312
1313 if (!p)
1314 return ret;
1315
1316 if (current->personality & STICKY_TIMEOUTS)
1317 goto sticky;
1318
1319 /* No update for zero timeout */
1320 if (!end_time->tv_sec && !end_time->tv_nsec)
1321 return ret;
1322
1323 ktime_get_ts(&ts);
1324 ts = timespec_sub(*end_time, ts);
1325 if (ts.tv_sec < 0)
1326 ts.tv_sec = ts.tv_nsec = 0;
1327
1328 if (timeval) {
1329 struct compat_timeval rtv;
1330
1331 rtv.tv_sec = ts.tv_sec;
1332 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1333
1334 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1335 return ret;
1336 } else {
1337 struct compat_timespec rts;
1338
1339 rts.tv_sec = ts.tv_sec;
1340 rts.tv_nsec = ts.tv_nsec;
1341
1342 if (!copy_to_user(p, &rts, sizeof(rts)))
1343 return ret;
1344 }
1345 /*
1346 * If an application puts its timeval in read-only memory, we
1347 * don't want the Linux-specific update to the timeval to
1348 * cause a fault after the select has completed
1349 * successfully. However, because we're not updating the
1350 * timeval, we can't restart the system call.
1351 */
1352
1353sticky:
1354 if (ret == -ERESTARTNOHAND)
1355 ret = -EINTR;
1356 return ret;
1357}
1358
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359/*
1360 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1361 * 64-bit unsigned longs.
1362 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001363static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1365 unsigned long *fdset)
1366{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001367 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 if (ufdset) {
1369 unsigned long odd;
1370
1371 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1372 return -EFAULT;
1373
1374 odd = nr & 1UL;
1375 nr &= ~1UL;
1376 while (nr) {
1377 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001378 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1379 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 ufdset += 2;
1381 *fdset++ = h << 32 | l;
1382 nr -= 2;
1383 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001384 if (odd && __get_user(*fdset, ufdset))
1385 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 } else {
1387 /* Tricky, must clear full unsigned long in the
1388 * kernel fdset at the end, this makes sure that
1389 * actually happens.
1390 */
1391 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1392 }
1393 return 0;
1394}
1395
Arjan van de Ven858119e2006-01-14 13:20:43 -08001396static
Heiko Carstens7116e992006-12-06 20:36:36 -08001397int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1398 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399{
1400 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001401 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
1403 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001404 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
1406 odd = nr & 1UL;
1407 nr &= ~1UL;
1408 while (nr) {
1409 unsigned long h, l;
1410 l = *fdset++;
1411 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001412 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1413 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 ufdset += 2;
1415 nr -= 2;
1416 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001417 if (odd && __put_user(*fdset, ufdset))
1418 return -EFAULT;
1419 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420}
1421
1422
1423/*
1424 * This is a virtual copy of sys_select from fs/select.c and probably
1425 * should be compared to it from time to time
1426 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
1428/*
1429 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1430 * like to be certain this leads to no problems. So I return
1431 * EINTR just for safety.
1432 *
1433 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1434 * I'm trying ERESTARTNOHAND which restart only when you want to.
1435 */
David Woodhouse9f729492006-01-18 17:44:05 -08001436int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001437 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1438 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439{
1440 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001441 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001442 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001443 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001444 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 if (n < 0)
1447 goto out_nofds;
1448
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001449 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001450 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001451 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001452 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001453 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001454 if (n > max_fds)
1455 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
1457 /*
1458 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1459 * since we used fdset we need to allocate memory in units of
1460 * long-words.
1461 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001463 bits = stack_fds;
1464 if (size > sizeof(stack_fds) / 6) {
1465 bits = kmalloc(6 * size, GFP_KERNEL);
1466 ret = -ENOMEM;
1467 if (!bits)
1468 goto out_nofds;
1469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 fds.in = (unsigned long *) bits;
1471 fds.out = (unsigned long *) (bits + size);
1472 fds.ex = (unsigned long *) (bits + 2*size);
1473 fds.res_in = (unsigned long *) (bits + 3*size);
1474 fds.res_out = (unsigned long *) (bits + 4*size);
1475 fds.res_ex = (unsigned long *) (bits + 5*size);
1476
1477 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1478 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1479 (ret = compat_get_fd_set(n, exp, fds.ex)))
1480 goto out;
1481 zero_fd_set(n, fds.res_in);
1482 zero_fd_set(n, fds.res_out);
1483 zero_fd_set(n, fds.res_ex);
1484
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001485 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 if (ret < 0)
1488 goto out;
1489 if (!ret) {
1490 ret = -ERESTARTNOHAND;
1491 if (signal_pending(current))
1492 goto out;
1493 ret = 0;
1494 }
1495
Heiko Carstens7116e992006-12-06 20:36:36 -08001496 if (compat_set_fd_set(n, inp, fds.res_in) ||
1497 compat_set_fd_set(n, outp, fds.res_out) ||
1498 compat_set_fd_set(n, exp, fds.res_ex))
1499 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001501 if (bits != stack_fds)
1502 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503out_nofds:
1504 return ret;
1505}
1506
David Woodhouse9f729492006-01-18 17:44:05 -08001507asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1508 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1509 struct compat_timeval __user *tvp)
1510{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001511 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001512 struct compat_timeval tv;
1513 int ret;
1514
1515 if (tvp) {
1516 if (copy_from_user(&tv, tvp, sizeof(tv)))
1517 return -EFAULT;
1518
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001519 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001520 if (poll_select_set_timeout(to,
1521 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1522 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001523 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001524 }
1525
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001526 ret = compat_core_sys_select(n, inp, outp, exp, to);
1527 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001528
1529 return ret;
1530}
1531
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001532struct compat_sel_arg_struct {
1533 compat_ulong_t n;
1534 compat_uptr_t inp;
1535 compat_uptr_t outp;
1536 compat_uptr_t exp;
1537 compat_uptr_t tvp;
1538};
1539
1540asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1541{
1542 struct compat_sel_arg_struct a;
1543
1544 if (copy_from_user(&a, arg, sizeof(a)))
1545 return -EFAULT;
1546 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1547 compat_ptr(a.exp), compat_ptr(a.tvp));
1548}
1549
Roland McGrathf3de2722008-04-30 00:53:09 -07001550#ifdef HAVE_SET_RESTORE_SIGMASK
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001551static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001552 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1553 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1554 compat_size_t sigsetsize)
1555{
1556 compat_sigset_t ss32;
1557 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001558 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001559 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001560 int ret;
1561
1562 if (tsp) {
1563 if (copy_from_user(&ts, tsp, sizeof(ts)))
1564 return -EFAULT;
1565
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001566 to = &end_time;
1567 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001568 return -EINVAL;
1569 }
1570
1571 if (sigmask) {
1572 if (sigsetsize != sizeof(compat_sigset_t))
1573 return -EINVAL;
1574 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1575 return -EFAULT;
1576 sigset_from_compat(&ksigmask, &ss32);
1577
1578 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1579 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1580 }
1581
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001582 ret = compat_core_sys_select(n, inp, outp, exp, to);
1583 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001584
1585 if (ret == -ERESTARTNOHAND) {
1586 /*
1587 * Don't restore the signal mask yet. Let do_signal() deliver
1588 * the signal on the way back to userspace, before the signal
1589 * mask is restored.
1590 */
1591 if (sigmask) {
1592 memcpy(&current->saved_sigmask, &sigsaved,
1593 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001594 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001595 }
1596 } else if (sigmask)
1597 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1598
1599 return ret;
1600}
1601
1602asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1603 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1604 struct compat_timespec __user *tsp, void __user *sig)
1605{
1606 compat_size_t sigsetsize = 0;
1607 compat_uptr_t up = 0;
1608
1609 if (sig) {
1610 if (!access_ok(VERIFY_READ, sig,
1611 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1612 __get_user(up, (compat_uptr_t __user *)sig) ||
1613 __get_user(sigsetsize,
1614 (compat_size_t __user *)(sig+sizeof(up))))
1615 return -EFAULT;
1616 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001617 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1618 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001619}
1620
1621asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1622 unsigned int nfds, struct compat_timespec __user *tsp,
1623 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1624{
1625 compat_sigset_t ss32;
1626 sigset_t ksigmask, sigsaved;
1627 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001628 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001629 int ret;
1630
1631 if (tsp) {
1632 if (copy_from_user(&ts, tsp, sizeof(ts)))
1633 return -EFAULT;
1634
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001635 to = &end_time;
1636 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1637 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001638 }
1639
1640 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001641 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001642 return -EINVAL;
1643 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1644 return -EFAULT;
1645 sigset_from_compat(&ksigmask, &ss32);
1646
1647 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1648 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1649 }
1650
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001651 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001652
1653 /* We can restart this syscall, usually */
1654 if (ret == -EINTR) {
1655 /*
1656 * Don't restore the signal mask yet. Let do_signal() deliver
1657 * the signal on the way back to userspace, before the signal
1658 * mask is restored.
1659 */
1660 if (sigmask) {
1661 memcpy(&current->saved_sigmask, &sigsaved,
1662 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001663 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001664 }
1665 ret = -ERESTARTNOHAND;
1666 } else if (sigmask)
1667 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1668
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001669 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001670
1671 return ret;
1672}
Roland McGrathf3de2722008-04-30 00:53:09 -07001673#endif /* HAVE_SET_RESTORE_SIGMASK */
David Woodhouse9f729492006-01-18 17:44:05 -08001674
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001675#ifdef CONFIG_EPOLL
1676
Roland McGrathf3de2722008-04-30 00:53:09 -07001677#ifdef HAVE_SET_RESTORE_SIGMASK
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001678asmlinkage long compat_sys_epoll_pwait(int epfd,
1679 struct compat_epoll_event __user *events,
1680 int maxevents, int timeout,
1681 const compat_sigset_t __user *sigmask,
1682 compat_size_t sigsetsize)
1683{
1684 long err;
1685 compat_sigset_t csigmask;
1686 sigset_t ksigmask, sigsaved;
1687
1688 /*
1689 * If the caller wants a certain signal mask to be set during the wait,
1690 * we apply it here.
1691 */
1692 if (sigmask) {
1693 if (sigsetsize != sizeof(compat_sigset_t))
1694 return -EINVAL;
1695 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1696 return -EFAULT;
1697 sigset_from_compat(&ksigmask, &csigmask);
1698 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1699 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1700 }
1701
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001702 err = sys_epoll_wait(epfd, events, maxevents, timeout);
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001703
1704 /*
1705 * If we changed the signal mask, we need to restore the original one.
1706 * In case we've got a signal while waiting, we do not restore the
1707 * signal mask yet, and we allow do_signal() to deliver the signal on
1708 * the way back to userspace, before the signal mask is restored.
1709 */
1710 if (sigmask) {
1711 if (err == -EINTR) {
1712 memcpy(&current->saved_sigmask, &sigsaved,
1713 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001714 set_restore_sigmask();
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001715 } else
1716 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1717 }
1718
1719 return err;
1720}
Roland McGrathf3de2722008-04-30 00:53:09 -07001721#endif /* HAVE_SET_RESTORE_SIGMASK */
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001722
1723#endif /* CONFIG_EPOLL */
Davide Libenzi6d18c922007-05-10 22:23:15 -07001724
1725#ifdef CONFIG_SIGNALFD
1726
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001727asmlinkage long compat_sys_signalfd4(int ufd,
1728 const compat_sigset_t __user *sigmask,
1729 compat_size_t sigsetsize, int flags)
Davide Libenzi6d18c922007-05-10 22:23:15 -07001730{
1731 compat_sigset_t ss32;
1732 sigset_t tmp;
1733 sigset_t __user *ksigmask;
1734
1735 if (sigsetsize != sizeof(compat_sigset_t))
1736 return -EINVAL;
1737 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1738 return -EFAULT;
1739 sigset_from_compat(&tmp, &ss32);
1740 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1741 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1742 return -EFAULT;
1743
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001744 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
Davide Libenzi6d18c922007-05-10 22:23:15 -07001745}
1746
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001747asmlinkage long compat_sys_signalfd(int ufd,
1748 const compat_sigset_t __user *sigmask,
1749 compat_size_t sigsetsize)
1750{
1751 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1752}
Davide Libenzi6d18c922007-05-10 22:23:15 -07001753#endif /* CONFIG_SIGNALFD */
1754
Davide Libenzi83f5d122007-05-10 22:23:18 -07001755#ifdef CONFIG_TIMERFD
1756
Davide Libenzi4d672e72008-02-04 22:27:26 -08001757asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1758 const struct compat_itimerspec __user *utmr,
1759 struct compat_itimerspec __user *otmr)
Davide Libenzi83f5d122007-05-10 22:23:18 -07001760{
Davide Libenzi4d672e72008-02-04 22:27:26 -08001761 int error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001762 struct itimerspec t;
1763 struct itimerspec __user *ut;
1764
Davide Libenzi83f5d122007-05-10 22:23:18 -07001765 if (get_compat_itimerspec(&t, utmr))
Heiko Carstens8317f142007-05-16 22:11:08 -07001766 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001767 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1768 if (copy_to_user(&ut[0], &t, sizeof(t)))
Heiko Carstens8317f142007-05-16 22:11:08 -07001769 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001770 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1771 if (!error && otmr)
1772 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1773 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001774
Davide Libenzi4d672e72008-02-04 22:27:26 -08001775 return error;
1776}
1777
1778asmlinkage long compat_sys_timerfd_gettime(int ufd,
1779 struct compat_itimerspec __user *otmr)
1780{
1781 int error;
1782 struct itimerspec t;
1783 struct itimerspec __user *ut;
1784
1785 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1786 error = sys_timerfd_gettime(ufd, ut);
1787 if (!error)
1788 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1789 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1790
1791 return error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001792}
1793
1794#endif /* CONFIG_TIMERFD */
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301795
1796#ifdef CONFIG_FHANDLE
1797/*
1798 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1799 * doesn't set the O_LARGEFILE flag.
1800 */
1801asmlinkage long
1802compat_sys_open_by_handle_at(int mountdirfd,
1803 struct file_handle __user *handle, int flags)
1804{
1805 return do_handle_open(mountdirfd, handle, flags);
1806}
1807#endif