blob: 07880bae28a9fa2128eb5df60c6193c39e099fb8 [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{
Al Virofcf83062012-02-12 20:56:29 -0500134 struct compat_stat tmp;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700135
Al Virofcf83062012-02-12 20:56:29 -0500136 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700137 return -EOVERFLOW;
138
Al Virofcf83062012-02-12 20:56:29 -0500139 memset(&tmp, 0, sizeof(tmp));
140 tmp.st_dev = old_encode_dev(stat->dev);
141 tmp.st_ino = stat->ino;
142 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
143 return -EOVERFLOW;
144 tmp.st_mode = stat->mode;
145 tmp.st_nlink = stat->nlink;
146 if (tmp.st_nlink != stat->nlink)
147 return -EOVERFLOW;
148 SET_UID(tmp.st_uid, stat->uid);
149 SET_GID(tmp.st_gid, stat->gid);
150 tmp.st_rdev = old_encode_dev(stat->rdev);
151 if ((u64) stat->size > MAX_NON_LFS)
152 return -EOVERFLOW;
153 tmp.st_size = stat->size;
154 tmp.st_atime = stat->atime.tv_sec;
155 tmp.st_atime_nsec = stat->atime.tv_nsec;
156 tmp.st_mtime = stat->mtime.tv_sec;
157 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
158 tmp.st_ctime = stat->ctime.tv_sec;
159 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
160 tmp.st_blocks = stat->blocks;
161 tmp.st_blksize = stat->blksize;
162 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700163}
164
David Howellsc7887322010-08-11 11:26:22 +0100165asmlinkage long compat_sys_newstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 struct compat_stat __user *statbuf)
167{
168 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400169 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400171 error = vfs_stat(filename, &stat);
172 if (error)
173 return error;
174 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
David Howellsc7887322010-08-11 11:26:22 +0100177asmlinkage long compat_sys_newlstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct compat_stat __user *statbuf)
179{
180 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400181 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400183 error = vfs_lstat(filename, &stat);
184 if (error)
185 return error;
186 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
Kyle McMartin82d821d2006-03-24 03:18:20 -0800189#ifndef __ARCH_WANT_STAT64
David Howellsc7887322010-08-11 11:26:22 +0100190asmlinkage long compat_sys_newfstatat(unsigned int dfd,
191 const char __user *filename,
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800192 struct compat_stat __user *statbuf, int flag)
193{
194 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400195 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800196
Oleg Drokin0112fc22009-04-08 20:05:42 +0400197 error = vfs_fstatat(dfd, filename, &stat, flag);
198 if (error)
199 return error;
200 return cp_compat_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800201}
Kyle McMartin82d821d2006-03-24 03:18:20 -0800202#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204asmlinkage long compat_sys_newfstat(unsigned int fd,
205 struct compat_stat __user * statbuf)
206{
207 struct kstat stat;
208 int error = vfs_fstat(fd, &stat);
209
210 if (!error)
211 error = cp_compat_stat(&stat, statbuf);
212 return error;
213}
214
215static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
216{
217
218 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700219 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
220 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return -EOVERFLOW;
222 /* f_files and f_ffree may be -1; it's okay
223 * to stuff that into 32 bits */
224 if (kbuf->f_files != 0xffffffffffffffffULL
225 && (kbuf->f_files & 0xffffffff00000000ULL))
226 return -EOVERFLOW;
227 if (kbuf->f_ffree != 0xffffffffffffffffULL
228 && (kbuf->f_ffree & 0xffffffff00000000ULL))
229 return -EOVERFLOW;
230 }
231 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
232 __put_user(kbuf->f_type, &ubuf->f_type) ||
233 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
234 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
235 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
236 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
237 __put_user(kbuf->f_files, &ubuf->f_files) ||
238 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
239 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
240 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
241 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
242 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
Eric W. Biederman1448c722011-10-17 13:40:02 -0700243 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
244 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return -EFAULT;
246 return 0;
247}
248
249/*
Namhyung Kim974d8792010-12-27 01:41:53 +0900250 * The following statfs calls are copies of code from fs/statfs.c and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 * should be checked against those from time to time
252 */
Al Viro2d8f3032008-07-22 09:59:21 -0400253asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Al Viroc8b91ac2011-03-12 10:41:39 -0500255 struct kstatfs tmp;
256 int error = user_statfs(pathname, &tmp);
257 if (!error)
258 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 return error;
260}
261
262asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
263{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 struct kstatfs tmp;
Al Viroc8b91ac2011-03-12 10:41:39 -0500265 int error = fd_statfs(fd, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800266 if (!error)
267 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return error;
269}
270
271static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
272{
273 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700274 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
275 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return -EOVERFLOW;
277 /* f_files and f_ffree may be -1; it's okay
278 * to stuff that into 32 bits */
279 if (kbuf->f_files != 0xffffffffffffffffULL
280 && (kbuf->f_files & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 if (kbuf->f_ffree != 0xffffffffffffffffULL
283 && (kbuf->f_ffree & 0xffffffff00000000ULL))
284 return -EOVERFLOW;
285 }
286 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
287 __put_user(kbuf->f_type, &ubuf->f_type) ||
288 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
289 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
290 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
291 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
292 __put_user(kbuf->f_files, &ubuf->f_files) ||
293 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
294 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
295 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
296 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
Namhyung Kime0bb6bd2010-12-27 01:41:54 +0900297 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
298 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
299 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return -EFAULT;
301 return 0;
302}
303
Al Viro2d8f3032008-07-22 09:59:21 -0400304asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 struct kstatfs tmp;
307 int error;
308
309 if (sz != sizeof(*buf))
310 return -EINVAL;
311
Al Viroc8b91ac2011-03-12 10:41:39 -0500312 error = user_statfs(pathname, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800313 if (!error)
314 error = put_compat_statfs64(buf, &tmp);
Al Viroc8b91ac2011-03-12 10:41:39 -0500315 return error;
316}
317
318asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
319{
320 struct kstatfs tmp;
321 int error;
322
323 if (sz != sizeof(*buf))
324 return -EINVAL;
325
326 error = fd_statfs(fd, &tmp);
327 if (!error)
328 error = put_compat_statfs64(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 return error;
330}
331
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100332/*
333 * This is a copy of sys_ustat, just dealing with a structure layout.
334 * Given how simple this syscall is that apporach is more maintainable
335 * than the various conversion hacks.
336 */
337asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
338{
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100339 struct compat_ustat tmp;
340 struct kstatfs sbuf;
Al Virocf31e702012-01-02 22:28:36 -0500341 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100342 if (err)
343 return err;
344
345 memset(&tmp, 0, sizeof(struct compat_ustat));
346 tmp.f_tfree = sbuf.f_bfree;
347 tmp.f_tinode = sbuf.f_ffree;
348 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
349 return -EFAULT;
350 return 0;
351}
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
354{
355 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
356 __get_user(kfl->l_type, &ufl->l_type) ||
357 __get_user(kfl->l_whence, &ufl->l_whence) ||
358 __get_user(kfl->l_start, &ufl->l_start) ||
359 __get_user(kfl->l_len, &ufl->l_len) ||
360 __get_user(kfl->l_pid, &ufl->l_pid))
361 return -EFAULT;
362 return 0;
363}
364
365static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
366{
367 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
368 __put_user(kfl->l_type, &ufl->l_type) ||
369 __put_user(kfl->l_whence, &ufl->l_whence) ||
370 __put_user(kfl->l_start, &ufl->l_start) ||
371 __put_user(kfl->l_len, &ufl->l_len) ||
372 __put_user(kfl->l_pid, &ufl->l_pid))
373 return -EFAULT;
374 return 0;
375}
376
377#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
378static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
379{
380 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
381 __get_user(kfl->l_type, &ufl->l_type) ||
382 __get_user(kfl->l_whence, &ufl->l_whence) ||
383 __get_user(kfl->l_start, &ufl->l_start) ||
384 __get_user(kfl->l_len, &ufl->l_len) ||
385 __get_user(kfl->l_pid, &ufl->l_pid))
386 return -EFAULT;
387 return 0;
388}
389#endif
390
391#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
392static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
393{
394 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
395 __put_user(kfl->l_type, &ufl->l_type) ||
396 __put_user(kfl->l_whence, &ufl->l_whence) ||
397 __put_user(kfl->l_start, &ufl->l_start) ||
398 __put_user(kfl->l_len, &ufl->l_len) ||
399 __put_user(kfl->l_pid, &ufl->l_pid))
400 return -EFAULT;
401 return 0;
402}
403#endif
404
405asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
406 unsigned long arg)
407{
408 mm_segment_t old_fs;
409 struct flock f;
410 long ret;
411
412 switch (cmd) {
413 case F_GETLK:
414 case F_SETLK:
415 case F_SETLKW:
416 ret = get_compat_flock(&f, compat_ptr(arg));
417 if (ret != 0)
418 break;
419 old_fs = get_fs();
420 set_fs(KERNEL_DS);
421 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
422 set_fs(old_fs);
423 if (cmd == F_GETLK && ret == 0) {
Nikanth Karthikesanff677f82009-04-01 14:40:51 +0530424 /* GETLK was successful and we need to return the data...
NeilBrown2520f142006-01-08 01:02:40 -0800425 * but it needs to fit in the compat structure.
426 * l_start shouldn't be too big, unless the original
427 * start + end is greater than COMPAT_OFF_T_MAX, in which
428 * case the app was asking for trouble, so we return
429 * -EOVERFLOW in that case.
430 * l_len could be too big, in which case we just truncate it,
431 * and only allow the app to see that part of the conflicting
432 * lock that might make sense to it anyway
433 */
434
435 if (f.l_start > COMPAT_OFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800437 if (f.l_len > COMPAT_OFF_T_MAX)
438 f.l_len = COMPAT_OFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (ret == 0)
440 ret = put_compat_flock(&f, compat_ptr(arg));
441 }
442 break;
443
444 case F_GETLK64:
445 case F_SETLK64:
446 case F_SETLKW64:
447 ret = get_compat_flock64(&f, compat_ptr(arg));
448 if (ret != 0)
449 break;
450 old_fs = get_fs();
451 set_fs(KERNEL_DS);
452 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
453 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
454 (unsigned long)&f);
455 set_fs(old_fs);
456 if (cmd == F_GETLK64 && ret == 0) {
NeilBrown2520f142006-01-08 01:02:40 -0800457 /* need to return lock information - see above for commentary */
458 if (f.l_start > COMPAT_LOFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800460 if (f.l_len > COMPAT_LOFF_T_MAX)
461 f.l_len = COMPAT_LOFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 if (ret == 0)
463 ret = put_compat_flock64(&f, compat_ptr(arg));
464 }
465 break;
466
467 default:
468 ret = sys_fcntl(fd, cmd, arg);
469 break;
470 }
471 return ret;
472}
473
474asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
475 unsigned long arg)
476{
477 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
478 return -EINVAL;
479 return compat_sys_fcntl64(fd, cmd, arg);
480}
481
482asmlinkage long
483compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
484{
485 long ret;
486 aio_context_t ctx64;
487
488 mm_segment_t oldfs = get_fs();
489 if (unlikely(get_user(ctx64, ctx32p)))
490 return -EFAULT;
491
492 set_fs(KERNEL_DS);
493 /* The __user pointer cast is valid because of the set_fs() */
494 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
495 set_fs(oldfs);
496 /* truncating is ok because it's a user address */
497 if (!ret)
498 ret = put_user((u32) ctx64, ctx32p);
499 return ret;
500}
501
502asmlinkage long
503compat_sys_io_getevents(aio_context_t ctx_id,
504 unsigned long min_nr,
505 unsigned long nr,
506 struct io_event __user *events,
507 struct compat_timespec __user *timeout)
508{
509 long ret;
510 struct timespec t;
511 struct timespec __user *ut = NULL;
512
513 ret = -EFAULT;
514 if (unlikely(!access_ok(VERIFY_WRITE, events,
515 nr * sizeof(struct io_event))))
516 goto out;
517 if (timeout) {
518 if (get_compat_timespec(&t, timeout))
519 goto out;
520
521 ut = compat_alloc_user_space(sizeof(*ut));
522 if (copy_to_user(ut, &t, sizeof(t)) )
523 goto out;
524 }
525 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
526out:
527 return ret;
528}
529
Jeff Moyerb8373362010-05-26 14:44:25 -0700530/* A write operation does a read from user space and vice versa */
531#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
532
533ssize_t compat_rw_copy_check_uvector(int type,
534 const struct compat_iovec __user *uvector, unsigned long nr_segs,
535 unsigned long fast_segs, struct iovec *fast_pointer,
Christopher Yeohfcf63402011-10-31 17:06:39 -0700536 struct iovec **ret_pointer, int check_access)
Jeff Moyerb8373362010-05-26 14:44:25 -0700537{
538 compat_ssize_t tot_len;
539 struct iovec *iov = *ret_pointer = fast_pointer;
540 ssize_t ret = 0;
541 int seg;
542
543 /*
544 * SuS says "The readv() function *may* fail if the iovcnt argument
545 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
546 * traditionally returned zero for zero segments, so...
547 */
548 if (nr_segs == 0)
549 goto out;
550
551 ret = -EINVAL;
552 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
553 goto out;
554 if (nr_segs > fast_segs) {
555 ret = -ENOMEM;
556 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
Namhyung Kim6a5640f2010-12-27 01:41:52 +0900557 if (iov == NULL)
Jeff Moyerb8373362010-05-26 14:44:25 -0700558 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -0700559 }
560 *ret_pointer = iov;
561
562 /*
563 * Single unix specification:
564 * We should -EINVAL if an element length is not >= 0 and fitting an
Linus Torvalds435f49a2010-10-29 10:36:49 -0700565 * ssize_t.
Jeff Moyerb8373362010-05-26 14:44:25 -0700566 *
Linus Torvalds435f49a2010-10-29 10:36:49 -0700567 * In Linux, the total length is limited to MAX_RW_COUNT, there is
568 * no overflow possibility.
Jeff Moyerb8373362010-05-26 14:44:25 -0700569 */
570 tot_len = 0;
571 ret = -EINVAL;
572 for (seg = 0; seg < nr_segs; seg++) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700573 compat_uptr_t buf;
574 compat_ssize_t len;
575
576 if (__get_user(len, &uvector->iov_len) ||
577 __get_user(buf, &uvector->iov_base)) {
578 ret = -EFAULT;
579 goto out;
580 }
581 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
582 goto out;
Christopher Yeohfcf63402011-10-31 17:06:39 -0700583 if (check_access &&
584 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700585 ret = -EFAULT;
586 goto out;
587 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700588 if (len > MAX_RW_COUNT - tot_len)
589 len = MAX_RW_COUNT - tot_len;
590 tot_len += len;
Jeff Moyerb8373362010-05-26 14:44:25 -0700591 iov->iov_base = compat_ptr(buf);
592 iov->iov_len = (compat_size_t) len;
593 uvector++;
594 iov++;
595 }
596 ret = tot_len;
597
598out:
599 return ret;
600}
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602static inline long
603copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
604{
605 compat_uptr_t uptr;
606 int i;
607
608 for (i = 0; i < nr; ++i) {
609 if (get_user(uptr, ptr32 + i))
610 return -EFAULT;
611 if (put_user(compat_ptr(uptr), ptr64 + i))
612 return -EFAULT;
613 }
614 return 0;
615}
616
617#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
618
619asmlinkage long
620compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
621{
622 struct iocb __user * __user *iocb64;
623 long ret;
624
625 if (unlikely(nr < 0))
626 return -EINVAL;
627
628 if (nr > MAX_AIO_SUBMITS)
629 nr = MAX_AIO_SUBMITS;
630
631 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
632 ret = copy_iocb(nr, iocb, iocb64);
633 if (!ret)
Jeff Moyer9d85cba2010-05-26 14:44:26 -0700634 ret = do_io_submit(ctx_id, nr, iocb64, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 return ret;
636}
637
638struct compat_ncp_mount_data {
639 compat_int_t version;
640 compat_uint_t ncp_fd;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700641 __compat_uid_t mounted_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 compat_pid_t wdog_pid;
643 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
644 compat_uint_t time_out;
645 compat_uint_t retry_count;
646 compat_uint_t flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700647 __compat_uid_t uid;
648 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 compat_mode_t file_mode;
650 compat_mode_t dir_mode;
651};
652
653struct compat_ncp_mount_data_v4 {
654 compat_int_t version;
655 compat_ulong_t flags;
656 compat_ulong_t mounted_uid;
657 compat_long_t wdog_pid;
658 compat_uint_t ncp_fd;
659 compat_uint_t time_out;
660 compat_uint_t retry_count;
661 compat_ulong_t uid;
662 compat_ulong_t gid;
663 compat_ulong_t file_mode;
664 compat_ulong_t dir_mode;
665};
666
667static void *do_ncp_super_data_conv(void *raw_data)
668{
669 int version = *(unsigned int *)raw_data;
670
671 if (version == 3) {
672 struct compat_ncp_mount_data *c_n = raw_data;
673 struct ncp_mount_data *n = raw_data;
674
675 n->dir_mode = c_n->dir_mode;
676 n->file_mode = c_n->file_mode;
677 n->gid = c_n->gid;
678 n->uid = c_n->uid;
679 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
680 n->wdog_pid = c_n->wdog_pid;
681 n->mounted_uid = c_n->mounted_uid;
682 } else if (version == 4) {
683 struct compat_ncp_mount_data_v4 *c_n = raw_data;
684 struct ncp_mount_data_v4 *n = raw_data;
685
686 n->dir_mode = c_n->dir_mode;
687 n->file_mode = c_n->file_mode;
688 n->gid = c_n->gid;
689 n->uid = c_n->uid;
690 n->retry_count = c_n->retry_count;
691 n->time_out = c_n->time_out;
692 n->ncp_fd = c_n->ncp_fd;
693 n->wdog_pid = c_n->wdog_pid;
694 n->mounted_uid = c_n->mounted_uid;
695 n->flags = c_n->flags;
696 } else if (version != 5) {
697 return NULL;
698 }
699
700 return raw_data;
701}
702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
David Howells9a9947b2005-04-18 10:54:51 -0700704struct compat_nfs_string {
705 compat_uint_t len;
David Howells5fc3e622005-04-27 15:39:03 -0700706 compat_uptr_t data;
David Howells9a9947b2005-04-18 10:54:51 -0700707};
708
709static inline void compat_nfs_string(struct nfs_string *dst,
710 struct compat_nfs_string *src)
711{
712 dst->data = compat_ptr(src->data);
713 dst->len = src->len;
714}
715
716struct compat_nfs4_mount_data_v1 {
717 compat_int_t version;
718 compat_int_t flags;
719 compat_int_t rsize;
720 compat_int_t wsize;
721 compat_int_t timeo;
722 compat_int_t retrans;
723 compat_int_t acregmin;
724 compat_int_t acregmax;
725 compat_int_t acdirmin;
726 compat_int_t acdirmax;
727 struct compat_nfs_string client_addr;
728 struct compat_nfs_string mnt_path;
729 struct compat_nfs_string hostname;
730 compat_uint_t host_addrlen;
David Howells5fc3e622005-04-27 15:39:03 -0700731 compat_uptr_t host_addr;
David Howells9a9947b2005-04-18 10:54:51 -0700732 compat_int_t proto;
733 compat_int_t auth_flavourlen;
David Howells5fc3e622005-04-27 15:39:03 -0700734 compat_uptr_t auth_flavours;
David Howells9a9947b2005-04-18 10:54:51 -0700735};
736
737static int do_nfs4_super_data_conv(void *raw_data)
738{
739 int version = *(compat_uint_t *) raw_data;
740
741 if (version == 1) {
742 struct compat_nfs4_mount_data_v1 *raw = raw_data;
743 struct nfs4_mount_data *real = raw_data;
744
745 /* copy the fields backwards */
746 real->auth_flavours = compat_ptr(raw->auth_flavours);
747 real->auth_flavourlen = raw->auth_flavourlen;
748 real->proto = raw->proto;
749 real->host_addr = compat_ptr(raw->host_addr);
750 real->host_addrlen = raw->host_addrlen;
751 compat_nfs_string(&real->hostname, &raw->hostname);
752 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
753 compat_nfs_string(&real->client_addr, &raw->client_addr);
754 real->acdirmax = raw->acdirmax;
755 real->acdirmin = raw->acdirmin;
756 real->acregmax = raw->acregmax;
757 real->acregmin = raw->acregmin;
758 real->retrans = raw->retrans;
759 real->timeo = raw->timeo;
760 real->wsize = raw->wsize;
761 real->rsize = raw->rsize;
762 real->flags = raw->flags;
763 real->version = raw->version;
764 }
David Howells9a9947b2005-04-18 10:54:51 -0700765
766 return 0;
767}
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769#define NCPFS_NAME "ncpfs"
David Howells9a9947b2005-04-18 10:54:51 -0700770#define NFS4_NAME "nfs4"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
David Howellsc7887322010-08-11 11:26:22 +0100772asmlinkage long compat_sys_mount(const char __user * dev_name,
773 const char __user * dir_name,
774 const char __user * type, unsigned long flags,
775 const void __user * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
Vegard Nossumeca6f532009-09-18 13:05:45 -0700777 char *kernel_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 unsigned long data_page;
Vegard Nossumeca6f532009-09-18 13:05:45 -0700779 char *kernel_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 char *dir_page;
781 int retval;
782
Vegard Nossumeca6f532009-09-18 13:05:45 -0700783 retval = copy_mount_string(type, &kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 if (retval < 0)
785 goto out;
786
787 dir_page = getname(dir_name);
788 retval = PTR_ERR(dir_page);
789 if (IS_ERR(dir_page))
790 goto out1;
791
Vegard Nossumeca6f532009-09-18 13:05:45 -0700792 retval = copy_mount_string(dev_name, &kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (retval < 0)
794 goto out2;
795
Vegard Nossumeca6f532009-09-18 13:05:45 -0700796 retval = copy_mount_options(data, &data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (retval < 0)
798 goto out3;
799
800 retval = -EINVAL;
801
Vegard Nossumeca6f532009-09-18 13:05:45 -0700802 if (kernel_type && data_page) {
Arnd Bergmann2116b7a2010-10-04 22:55:57 +0200803 if (!strcmp(kernel_type, NCPFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 do_ncp_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700805 } else if (!strcmp(kernel_type, NFS4_NAME)) {
David Howells9a9947b2005-04-18 10:54:51 -0700806 if (do_nfs4_super_data_conv((void *) data_page))
807 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 }
809 }
810
Vegard Nossumeca6f532009-09-18 13:05:45 -0700811 retval = do_mount(kernel_dev, dir_page, kernel_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 flags, (void*)data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
David Howells9a9947b2005-04-18 10:54:51 -0700814 out4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 free_page(data_page);
816 out3:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700817 kfree(kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 out2:
819 putname(dir_page);
820 out1:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700821 kfree(kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 out:
823 return retval;
824}
825
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826struct compat_old_linux_dirent {
827 compat_ulong_t d_ino;
828 compat_ulong_t d_offset;
829 unsigned short d_namlen;
830 char d_name[1];
831};
832
833struct compat_readdir_callback {
834 struct compat_old_linux_dirent __user *dirent;
835 int result;
836};
837
838static int compat_fillonedir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700839 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
841 struct compat_readdir_callback *buf = __buf;
842 struct compat_old_linux_dirent __user *dirent;
David Howellsafefdbb2006-10-03 01:13:46 -0700843 compat_ulong_t d_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 if (buf->result)
846 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700847 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400848 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
849 buf->result = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700850 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400851 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 buf->result++;
853 dirent = buf->dirent;
854 if (!access_ok(VERIFY_WRITE, dirent,
855 (unsigned long)(dirent->d_name + namlen + 1) -
856 (unsigned long)dirent))
857 goto efault;
David Howellsafefdbb2006-10-03 01:13:46 -0700858 if ( __put_user(d_ino, &dirent->d_ino) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 __put_user(offset, &dirent->d_offset) ||
860 __put_user(namlen, &dirent->d_namlen) ||
861 __copy_to_user(dirent->d_name, name, namlen) ||
862 __put_user(0, dirent->d_name + namlen))
863 goto efault;
864 return 0;
865efault:
866 buf->result = -EFAULT;
867 return -EFAULT;
868}
869
870asmlinkage long compat_sys_old_readdir(unsigned int fd,
871 struct compat_old_linux_dirent __user *dirent, unsigned int count)
872{
873 int error;
874 struct file *file;
875 struct compat_readdir_callback buf;
876
877 error = -EBADF;
878 file = fget(fd);
879 if (!file)
880 goto out;
881
882 buf.result = 0;
883 buf.dirent = dirent;
884
885 error = vfs_readdir(file, compat_fillonedir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400886 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 error = buf.result;
888
889 fput(file);
890out:
891 return error;
892}
893
894struct compat_linux_dirent {
895 compat_ulong_t d_ino;
896 compat_ulong_t d_off;
897 unsigned short d_reclen;
898 char d_name[1];
899};
900
901struct compat_getdents_callback {
902 struct compat_linux_dirent __user *current_dir;
903 struct compat_linux_dirent __user *previous;
904 int count;
905 int error;
906};
907
908static int compat_filldir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700909 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910{
911 struct compat_linux_dirent __user * dirent;
912 struct compat_getdents_callback *buf = __buf;
David Howellsafefdbb2006-10-03 01:13:46 -0700913 compat_ulong_t d_ino;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700914 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
915 namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
917 buf->error = -EINVAL; /* only used if we fail.. */
918 if (reclen > buf->count)
919 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700920 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400921 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
922 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700923 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400924 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 dirent = buf->previous;
926 if (dirent) {
927 if (__put_user(offset, &dirent->d_off))
928 goto efault;
929 }
930 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700931 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 goto efault;
933 if (__put_user(reclen, &dirent->d_reclen))
934 goto efault;
935 if (copy_to_user(dirent->d_name, name, namlen))
936 goto efault;
937 if (__put_user(0, dirent->d_name + namlen))
938 goto efault;
939 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
940 goto efault;
941 buf->previous = dirent;
942 dirent = (void __user *)dirent + reclen;
943 buf->current_dir = dirent;
944 buf->count -= reclen;
945 return 0;
946efault:
947 buf->error = -EFAULT;
948 return -EFAULT;
949}
950
951asmlinkage long compat_sys_getdents(unsigned int fd,
952 struct compat_linux_dirent __user *dirent, unsigned int count)
953{
954 struct file * file;
955 struct compat_linux_dirent __user * lastdirent;
956 struct compat_getdents_callback buf;
957 int error;
958
959 error = -EFAULT;
960 if (!access_ok(VERIFY_WRITE, dirent, count))
961 goto out;
962
963 error = -EBADF;
964 file = fget(fd);
965 if (!file)
966 goto out;
967
968 buf.current_dir = dirent;
969 buf.previous = NULL;
970 buf.count = count;
971 buf.error = 0;
972
973 error = vfs_readdir(file, compat_filldir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400974 if (error >= 0)
975 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 lastdirent = buf.previous;
977 if (lastdirent) {
978 if (put_user(file->f_pos, &lastdirent->d_off))
979 error = -EFAULT;
980 else
981 error = count - buf.count;
982 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 fput(file);
984out:
985 return error;
986}
987
988#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990struct compat_getdents_callback64 {
991 struct linux_dirent64 __user *current_dir;
992 struct linux_dirent64 __user *previous;
993 int count;
994 int error;
995};
996
997static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
David Howellsafefdbb2006-10-03 01:13:46 -0700998 u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
1000 struct linux_dirent64 __user *dirent;
1001 struct compat_getdents_callback64 *buf = __buf;
Kevin Winchester85c9fe82010-08-09 17:20:22 -07001002 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1003 sizeof(u64));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 u64 off;
1005
1006 buf->error = -EINVAL; /* only used if we fail.. */
1007 if (reclen > buf->count)
1008 return -EINVAL;
1009 dirent = buf->previous;
1010
1011 if (dirent) {
1012 if (__put_user_unaligned(offset, &dirent->d_off))
1013 goto efault;
1014 }
1015 dirent = buf->current_dir;
1016 if (__put_user_unaligned(ino, &dirent->d_ino))
1017 goto efault;
1018 off = 0;
1019 if (__put_user_unaligned(off, &dirent->d_off))
1020 goto efault;
1021 if (__put_user(reclen, &dirent->d_reclen))
1022 goto efault;
1023 if (__put_user(d_type, &dirent->d_type))
1024 goto efault;
1025 if (copy_to_user(dirent->d_name, name, namlen))
1026 goto efault;
1027 if (__put_user(0, dirent->d_name + namlen))
1028 goto efault;
1029 buf->previous = dirent;
1030 dirent = (void __user *)dirent + reclen;
1031 buf->current_dir = dirent;
1032 buf->count -= reclen;
1033 return 0;
1034efault:
1035 buf->error = -EFAULT;
1036 return -EFAULT;
1037}
1038
1039asmlinkage long compat_sys_getdents64(unsigned int fd,
1040 struct linux_dirent64 __user * dirent, unsigned int count)
1041{
1042 struct file * file;
1043 struct linux_dirent64 __user * lastdirent;
1044 struct compat_getdents_callback64 buf;
1045 int error;
1046
1047 error = -EFAULT;
1048 if (!access_ok(VERIFY_WRITE, dirent, count))
1049 goto out;
1050
1051 error = -EBADF;
1052 file = fget(fd);
1053 if (!file)
1054 goto out;
1055
1056 buf.current_dir = dirent;
1057 buf.previous = NULL;
1058 buf.count = count;
1059 buf.error = 0;
1060
1061 error = vfs_readdir(file, compat_filldir64, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -04001062 if (error >= 0)
1063 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 lastdirent = buf.previous;
1065 if (lastdirent) {
1066 typeof(lastdirent->d_off) d_off = file->f_pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001067 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001068 error = -EFAULT;
1069 else
1070 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 fput(file);
1073out:
1074 return error;
1075}
1076#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1077
1078static ssize_t compat_do_readv_writev(int type, struct file *file,
1079 const struct compat_iovec __user *uvector,
1080 unsigned long nr_segs, loff_t *pos)
1081{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 compat_ssize_t tot_len;
1083 struct iovec iovstack[UIO_FASTIOV];
Dan Rosenberg767b68e2010-09-22 14:32:56 -04001084 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 io_fn_t fn;
1087 iov_fn_t fnv;
1088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 if (!file->f_op)
1091 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -07001092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 ret = -EFAULT;
1094 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1095 goto out;
1096
Jeff Moyerb8373362010-05-26 14:44:25 -07001097 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
Christopher Yeohfcf63402011-10-31 17:06:39 -07001098 UIO_FASTIOV, iovstack, &iov, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 if (tot_len == 0) {
1100 ret = 0;
1101 goto out;
1102 }
1103
1104 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001105 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 goto out;
1107
1108 fnv = NULL;
1109 if (type == READ) {
1110 fn = file->f_op->read;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001111 fnv = file->f_op->aio_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 } else {
1113 fn = (io_fn_t)file->f_op->write;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001114 fnv = file->f_op->aio_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 }
1116
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001117 if (fnv)
1118 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1119 pos, fnv);
1120 else
1121 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123out:
1124 if (iov != iovstack)
1125 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -04001126 if ((ret + (type == READ)) > 0) {
Robert Love0eeca282005-07-12 17:06:03 -04001127 if (type == READ)
Eric Paris2a12a9d2009-12-17 21:24:21 -05001128 fsnotify_access(file);
Robert Love0eeca282005-07-12 17:06:03 -04001129 else
Eric Paris2a12a9d2009-12-17 21:24:21 -05001130 fsnotify_modify(file);
Robert Love0eeca282005-07-12 17:06:03 -04001131 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 return ret;
1133}
1134
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001135static size_t compat_readv(struct file *file,
1136 const struct compat_iovec __user *vec,
1137 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 ssize_t ret = -EBADF;
1140
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 if (!(file->f_mode & FMODE_READ))
1142 goto out;
1143
1144 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001145 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 goto out;
1147
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001148 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
1150out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001151 if (ret > 0)
1152 add_rchar(current, ret);
1153 inc_syscr(current);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001154 return ret;
1155}
1156
1157asmlinkage ssize_t
1158compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1159 unsigned long vlen)
1160{
1161 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001162 int fput_needed;
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001163 ssize_t ret;
1164
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001165 file = fget_light(fd, &fput_needed);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001166 if (!file)
1167 return -EBADF;
1168 ret = compat_readv(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001169 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return ret;
1171}
1172
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001173asmlinkage ssize_t
1174compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001175 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001176{
1177 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1178 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001179 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001180 ssize_t ret;
1181
1182 if (pos < 0)
1183 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001184 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001185 if (!file)
1186 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001187 ret = -ESPIPE;
1188 if (file->f_mode & FMODE_PREAD)
1189 ret = compat_readv(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001190 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001191 return ret;
1192}
1193
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001194static size_t compat_writev(struct file *file,
1195 const struct compat_iovec __user *vec,
1196 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 ssize_t ret = -EBADF;
1199
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 if (!(file->f_mode & FMODE_WRITE))
1201 goto out;
1202
1203 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001204 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 goto out;
1206
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001207 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
1209out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001210 if (ret > 0)
1211 add_wchar(current, ret);
1212 inc_syscw(current);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001213 return ret;
1214}
1215
1216asmlinkage ssize_t
1217compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1218 unsigned long vlen)
1219{
1220 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001221 int fput_needed;
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001222 ssize_t ret;
1223
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001224 file = fget_light(fd, &fput_needed);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001225 if (!file)
1226 return -EBADF;
1227 ret = compat_writev(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001228 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 return ret;
1230}
1231
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001232asmlinkage ssize_t
1233compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001234 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001235{
1236 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1237 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001238 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001239 ssize_t ret;
1240
1241 if (pos < 0)
1242 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001243 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001244 if (!file)
1245 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001246 ret = -ESPIPE;
1247 if (file->f_mode & FMODE_PWRITE)
1248 ret = compat_writev(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001249 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001250 return ret;
1251}
1252
Andi Kleend2610202006-05-01 12:15:48 -07001253asmlinkage long
1254compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1255 unsigned int nr_segs, unsigned int flags)
1256{
1257 unsigned i;
Al Viro90cbad62006-10-10 22:44:17 +01001258 struct iovec __user *iov;
Jens Axboe98232d52006-05-04 09:13:49 +02001259 if (nr_segs > UIO_MAXIOV)
Andi Kleend2610202006-05-01 12:15:48 -07001260 return -EINVAL;
1261 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1262 for (i = 0; i < nr_segs; i++) {
1263 struct compat_iovec v;
1264 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1265 get_user(v.iov_len, &iov32[i].iov_len) ||
1266 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1267 put_user(v.iov_len, &iov[i].iov_len))
1268 return -EFAULT;
1269 }
1270 return sys_vmsplice(fd, iov, nr_segs, flags);
1271}
1272
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001274 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1275 * O_LARGEFILE flag.
1276 */
1277asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001278compat_sys_open(const char __user *filename, int flags, umode_t mode)
Miklos Szeredie922efc2005-09-06 15:18:25 -07001279{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001280 return do_sys_open(AT_FDCWD, filename, flags, mode);
1281}
1282
1283/*
1284 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1285 * O_LARGEFILE flag.
1286 */
1287asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001288compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001289{
1290 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001291}
1292
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1294
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001295static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1296 int timeval, int ret)
1297{
1298 struct timespec ts;
1299
1300 if (!p)
1301 return ret;
1302
1303 if (current->personality & STICKY_TIMEOUTS)
1304 goto sticky;
1305
1306 /* No update for zero timeout */
1307 if (!end_time->tv_sec && !end_time->tv_nsec)
1308 return ret;
1309
1310 ktime_get_ts(&ts);
1311 ts = timespec_sub(*end_time, ts);
1312 if (ts.tv_sec < 0)
1313 ts.tv_sec = ts.tv_nsec = 0;
1314
1315 if (timeval) {
1316 struct compat_timeval rtv;
1317
1318 rtv.tv_sec = ts.tv_sec;
1319 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1320
1321 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1322 return ret;
1323 } else {
1324 struct compat_timespec rts;
1325
1326 rts.tv_sec = ts.tv_sec;
1327 rts.tv_nsec = ts.tv_nsec;
1328
1329 if (!copy_to_user(p, &rts, sizeof(rts)))
1330 return ret;
1331 }
1332 /*
1333 * If an application puts its timeval in read-only memory, we
1334 * don't want the Linux-specific update to the timeval to
1335 * cause a fault after the select has completed
1336 * successfully. However, because we're not updating the
1337 * timeval, we can't restart the system call.
1338 */
1339
1340sticky:
1341 if (ret == -ERESTARTNOHAND)
1342 ret = -EINTR;
1343 return ret;
1344}
1345
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346/*
1347 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1348 * 64-bit unsigned longs.
1349 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001350static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1352 unsigned long *fdset)
1353{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001354 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 if (ufdset) {
1356 unsigned long odd;
1357
1358 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1359 return -EFAULT;
1360
1361 odd = nr & 1UL;
1362 nr &= ~1UL;
1363 while (nr) {
1364 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001365 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1366 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 ufdset += 2;
1368 *fdset++ = h << 32 | l;
1369 nr -= 2;
1370 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001371 if (odd && __get_user(*fdset, ufdset))
1372 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 } else {
1374 /* Tricky, must clear full unsigned long in the
1375 * kernel fdset at the end, this makes sure that
1376 * actually happens.
1377 */
1378 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1379 }
1380 return 0;
1381}
1382
Arjan van de Ven858119e2006-01-14 13:20:43 -08001383static
Heiko Carstens7116e992006-12-06 20:36:36 -08001384int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1385 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386{
1387 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001388 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
1390 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001391 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
1393 odd = nr & 1UL;
1394 nr &= ~1UL;
1395 while (nr) {
1396 unsigned long h, l;
1397 l = *fdset++;
1398 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001399 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1400 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 ufdset += 2;
1402 nr -= 2;
1403 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001404 if (odd && __put_user(*fdset, ufdset))
1405 return -EFAULT;
1406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407}
1408
1409
1410/*
1411 * This is a virtual copy of sys_select from fs/select.c and probably
1412 * should be compared to it from time to time
1413 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
1415/*
1416 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1417 * like to be certain this leads to no problems. So I return
1418 * EINTR just for safety.
1419 *
1420 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1421 * I'm trying ERESTARTNOHAND which restart only when you want to.
1422 */
David Woodhouse9f729492006-01-18 17:44:05 -08001423int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001424 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1425 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426{
1427 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001428 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001429 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001430 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001431 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 if (n < 0)
1434 goto out_nofds;
1435
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001436 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001437 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001438 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001439 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001440 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001441 if (n > max_fds)
1442 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 /*
1445 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1446 * since we used fdset we need to allocate memory in units of
1447 * long-words.
1448 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001450 bits = stack_fds;
1451 if (size > sizeof(stack_fds) / 6) {
1452 bits = kmalloc(6 * size, GFP_KERNEL);
1453 ret = -ENOMEM;
1454 if (!bits)
1455 goto out_nofds;
1456 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 fds.in = (unsigned long *) bits;
1458 fds.out = (unsigned long *) (bits + size);
1459 fds.ex = (unsigned long *) (bits + 2*size);
1460 fds.res_in = (unsigned long *) (bits + 3*size);
1461 fds.res_out = (unsigned long *) (bits + 4*size);
1462 fds.res_ex = (unsigned long *) (bits + 5*size);
1463
1464 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1465 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1466 (ret = compat_get_fd_set(n, exp, fds.ex)))
1467 goto out;
1468 zero_fd_set(n, fds.res_in);
1469 zero_fd_set(n, fds.res_out);
1470 zero_fd_set(n, fds.res_ex);
1471
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001472 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474 if (ret < 0)
1475 goto out;
1476 if (!ret) {
1477 ret = -ERESTARTNOHAND;
1478 if (signal_pending(current))
1479 goto out;
1480 ret = 0;
1481 }
1482
Heiko Carstens7116e992006-12-06 20:36:36 -08001483 if (compat_set_fd_set(n, inp, fds.res_in) ||
1484 compat_set_fd_set(n, outp, fds.res_out) ||
1485 compat_set_fd_set(n, exp, fds.res_ex))
1486 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001488 if (bits != stack_fds)
1489 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490out_nofds:
1491 return ret;
1492}
1493
David Woodhouse9f729492006-01-18 17:44:05 -08001494asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1495 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1496 struct compat_timeval __user *tvp)
1497{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001498 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001499 struct compat_timeval tv;
1500 int ret;
1501
1502 if (tvp) {
1503 if (copy_from_user(&tv, tvp, sizeof(tv)))
1504 return -EFAULT;
1505
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001506 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001507 if (poll_select_set_timeout(to,
1508 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1509 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001510 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001511 }
1512
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001513 ret = compat_core_sys_select(n, inp, outp, exp, to);
1514 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001515
1516 return ret;
1517}
1518
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001519struct compat_sel_arg_struct {
1520 compat_ulong_t n;
1521 compat_uptr_t inp;
1522 compat_uptr_t outp;
1523 compat_uptr_t exp;
1524 compat_uptr_t tvp;
1525};
1526
1527asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1528{
1529 struct compat_sel_arg_struct a;
1530
1531 if (copy_from_user(&a, arg, sizeof(a)))
1532 return -EFAULT;
1533 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1534 compat_ptr(a.exp), compat_ptr(a.tvp));
1535}
1536
Roland McGrathf3de2722008-04-30 00:53:09 -07001537#ifdef HAVE_SET_RESTORE_SIGMASK
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001538static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001539 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1540 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1541 compat_size_t sigsetsize)
1542{
1543 compat_sigset_t ss32;
1544 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001545 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001546 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001547 int ret;
1548
1549 if (tsp) {
1550 if (copy_from_user(&ts, tsp, sizeof(ts)))
1551 return -EFAULT;
1552
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001553 to = &end_time;
1554 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001555 return -EINVAL;
1556 }
1557
1558 if (sigmask) {
1559 if (sigsetsize != sizeof(compat_sigset_t))
1560 return -EINVAL;
1561 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1562 return -EFAULT;
1563 sigset_from_compat(&ksigmask, &ss32);
1564
1565 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1566 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1567 }
1568
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001569 ret = compat_core_sys_select(n, inp, outp, exp, to);
1570 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001571
1572 if (ret == -ERESTARTNOHAND) {
1573 /*
1574 * Don't restore the signal mask yet. Let do_signal() deliver
1575 * the signal on the way back to userspace, before the signal
1576 * mask is restored.
1577 */
1578 if (sigmask) {
1579 memcpy(&current->saved_sigmask, &sigsaved,
1580 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001581 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001582 }
1583 } else if (sigmask)
1584 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1585
1586 return ret;
1587}
1588
1589asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1590 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1591 struct compat_timespec __user *tsp, void __user *sig)
1592{
1593 compat_size_t sigsetsize = 0;
1594 compat_uptr_t up = 0;
1595
1596 if (sig) {
1597 if (!access_ok(VERIFY_READ, sig,
1598 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1599 __get_user(up, (compat_uptr_t __user *)sig) ||
1600 __get_user(sigsetsize,
1601 (compat_size_t __user *)(sig+sizeof(up))))
1602 return -EFAULT;
1603 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001604 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1605 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001606}
1607
1608asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1609 unsigned int nfds, struct compat_timespec __user *tsp,
1610 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1611{
1612 compat_sigset_t ss32;
1613 sigset_t ksigmask, sigsaved;
1614 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001615 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001616 int ret;
1617
1618 if (tsp) {
1619 if (copy_from_user(&ts, tsp, sizeof(ts)))
1620 return -EFAULT;
1621
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001622 to = &end_time;
1623 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1624 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001625 }
1626
1627 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001628 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001629 return -EINVAL;
1630 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1631 return -EFAULT;
1632 sigset_from_compat(&ksigmask, &ss32);
1633
1634 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1635 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1636 }
1637
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001638 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001639
1640 /* We can restart this syscall, usually */
1641 if (ret == -EINTR) {
1642 /*
1643 * Don't restore the signal mask yet. Let do_signal() deliver
1644 * the signal on the way back to userspace, before the signal
1645 * mask is restored.
1646 */
1647 if (sigmask) {
1648 memcpy(&current->saved_sigmask, &sigsaved,
1649 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001650 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001651 }
1652 ret = -ERESTARTNOHAND;
1653 } else if (sigmask)
1654 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1655
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001656 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001657
1658 return ret;
1659}
Roland McGrathf3de2722008-04-30 00:53:09 -07001660#endif /* HAVE_SET_RESTORE_SIGMASK */
David Woodhouse9f729492006-01-18 17:44:05 -08001661
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001662#ifdef CONFIG_EPOLL
1663
Roland McGrathf3de2722008-04-30 00:53:09 -07001664#ifdef HAVE_SET_RESTORE_SIGMASK
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001665asmlinkage long compat_sys_epoll_pwait(int epfd,
1666 struct compat_epoll_event __user *events,
1667 int maxevents, int timeout,
1668 const compat_sigset_t __user *sigmask,
1669 compat_size_t sigsetsize)
1670{
1671 long err;
1672 compat_sigset_t csigmask;
1673 sigset_t ksigmask, sigsaved;
1674
1675 /*
1676 * If the caller wants a certain signal mask to be set during the wait,
1677 * we apply it here.
1678 */
1679 if (sigmask) {
1680 if (sigsetsize != sizeof(compat_sigset_t))
1681 return -EINVAL;
1682 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1683 return -EFAULT;
1684 sigset_from_compat(&ksigmask, &csigmask);
1685 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1686 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1687 }
1688
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001689 err = sys_epoll_wait(epfd, events, maxevents, timeout);
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001690
1691 /*
1692 * If we changed the signal mask, we need to restore the original one.
1693 * In case we've got a signal while waiting, we do not restore the
1694 * signal mask yet, and we allow do_signal() to deliver the signal on
1695 * the way back to userspace, before the signal mask is restored.
1696 */
1697 if (sigmask) {
1698 if (err == -EINTR) {
1699 memcpy(&current->saved_sigmask, &sigsaved,
1700 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001701 set_restore_sigmask();
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001702 } else
1703 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1704 }
1705
1706 return err;
1707}
Roland McGrathf3de2722008-04-30 00:53:09 -07001708#endif /* HAVE_SET_RESTORE_SIGMASK */
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001709
1710#endif /* CONFIG_EPOLL */
Davide Libenzi6d18c922007-05-10 22:23:15 -07001711
1712#ifdef CONFIG_SIGNALFD
1713
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001714asmlinkage long compat_sys_signalfd4(int ufd,
1715 const compat_sigset_t __user *sigmask,
1716 compat_size_t sigsetsize, int flags)
Davide Libenzi6d18c922007-05-10 22:23:15 -07001717{
1718 compat_sigset_t ss32;
1719 sigset_t tmp;
1720 sigset_t __user *ksigmask;
1721
1722 if (sigsetsize != sizeof(compat_sigset_t))
1723 return -EINVAL;
1724 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1725 return -EFAULT;
1726 sigset_from_compat(&tmp, &ss32);
1727 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1728 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1729 return -EFAULT;
1730
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001731 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
Davide Libenzi6d18c922007-05-10 22:23:15 -07001732}
1733
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001734asmlinkage long compat_sys_signalfd(int ufd,
1735 const compat_sigset_t __user *sigmask,
1736 compat_size_t sigsetsize)
1737{
1738 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1739}
Davide Libenzi6d18c922007-05-10 22:23:15 -07001740#endif /* CONFIG_SIGNALFD */
1741
Davide Libenzi83f5d122007-05-10 22:23:18 -07001742#ifdef CONFIG_TIMERFD
1743
Davide Libenzi4d672e72008-02-04 22:27:26 -08001744asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1745 const struct compat_itimerspec __user *utmr,
1746 struct compat_itimerspec __user *otmr)
Davide Libenzi83f5d122007-05-10 22:23:18 -07001747{
Davide Libenzi4d672e72008-02-04 22:27:26 -08001748 int error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001749 struct itimerspec t;
1750 struct itimerspec __user *ut;
1751
Davide Libenzi83f5d122007-05-10 22:23:18 -07001752 if (get_compat_itimerspec(&t, utmr))
Heiko Carstens8317f142007-05-16 22:11:08 -07001753 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001754 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1755 if (copy_to_user(&ut[0], &t, sizeof(t)))
Heiko Carstens8317f142007-05-16 22:11:08 -07001756 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001757 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1758 if (!error && otmr)
1759 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1760 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001761
Davide Libenzi4d672e72008-02-04 22:27:26 -08001762 return error;
1763}
1764
1765asmlinkage long compat_sys_timerfd_gettime(int ufd,
1766 struct compat_itimerspec __user *otmr)
1767{
1768 int error;
1769 struct itimerspec t;
1770 struct itimerspec __user *ut;
1771
1772 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1773 error = sys_timerfd_gettime(ufd, ut);
1774 if (!error)
1775 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1776 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1777
1778 return error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001779}
1780
1781#endif /* CONFIG_TIMERFD */
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301782
1783#ifdef CONFIG_FHANDLE
1784/*
1785 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1786 * doesn't set the O_LARGEFILE flag.
1787 */
1788asmlinkage long
1789compat_sys_open_by_handle_at(int mountdirfd,
1790 struct file_handle __user *handle, int flags)
1791{
1792 return do_handle_open(mountdirfd, handle, flags);
1793}
1794#endif