blob: ca926ad0430cf715af12ebc3f0fa86d8c273d492 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/dirent.h>
Robert Love0eeca282005-07-12 17:06:03 -040037#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/highuid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/personality.h>
40#include <linux/rwsem.h>
Jay Lan8f0ab512006-09-30 23:28:59 -070041#include <linux/tsacct_kern.h>
Christoph Hellwig6272e262007-05-08 00:29:21 -070042#include <linux/security.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040043#include <linux/highmem.h>
Davide Libenzi6d18c922007-05-10 22:23:15 -070044#include <linux/signal.h>
Al Virobd01f842006-10-19 17:23:57 -040045#include <linux/poll.h>
David S. Miller4a805e82005-09-14 21:40:00 -070046#include <linux/mm.h>
Al Viro498052b2009-03-30 07:20:30 -040047#include <linux/fs_struct.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090048#include <linux/slab.h>
wu zhangjin504b7012010-10-30 08:19:35 -070049#include <linux/pagemap.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070050#include <linux/aio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <asm/uaccess.h>
53#include <asm/mmu_context.h>
54#include <asm/ioctls.h>
David Howells07f3f052006-09-30 20:52:18 +020055#include "internal.h"
David Woodhouse9f729492006-01-18 17:44:05 -080056
Andi Kleenbebfa102006-06-26 13:56:52 +020057int compat_log = 1;
58
59int compat_printk(const char *fmt, ...)
60{
61 va_list ap;
62 int ret;
63 if (!compat_log)
64 return 0;
65 va_start(ap, fmt);
66 ret = vprintk(fmt, ap);
67 va_end(ap);
68 return ret;
69}
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/*
72 * Not all architectures have sys_utime, so implement this in terms
73 * of sys_utimes.
74 */
Heiko Carstens625b1d72014-03-04 10:53:50 +010075COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
76 struct compat_utimbuf __user *, t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Ulrich Drepper1c710c82007-05-08 00:33:25 -070078 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80 if (t) {
81 if (get_user(tv[0].tv_sec, &t->actime) ||
82 get_user(tv[1].tv_sec, &t->modtime))
83 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -070084 tv[0].tv_nsec = 0;
85 tv[1].tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -070087 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
88}
89
Heiko Carstens625b1d72014-03-04 10:53:50 +010090COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
Ulrich Drepper1c710c82007-05-08 00:33:25 -070091{
92 struct timespec tv[2];
93
94 if (t) {
H. Peter Anvin81993e82014-02-01 18:54:11 -080095 if (compat_get_timespec(&tv[0], &t[0]) ||
96 compat_get_timespec(&tv[1], &t[1]))
Ulrich Drepper1c710c82007-05-08 00:33:25 -070097 return -EFAULT;
98
Ulrich Drepper1c710c82007-05-08 00:33:25 -070099 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
100 return 0;
101 }
102 return do_utimes(dfd, filename, t ? tv : NULL, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
Heiko Carstens625b1d72014-03-04 10:53:50 +0100105COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700107 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100109 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700111 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700113 get_user(tv[1].tv_nsec, &t[1].tv_usec))
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100114 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700115 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
116 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
117 return -EINVAL;
118 tv[0].tv_nsec *= 1000;
119 tv[1].tv_nsec *= 1000;
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100120 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700121 return do_utimes(dfd, filename, t ? tv : NULL, 0);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800122}
123
Heiko Carstens625b1d72014-03-04 10:53:50 +0100124COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800125{
126 return compat_sys_futimesat(AT_FDCWD, filename, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700129static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
130{
Al Virofcf83062012-02-12 20:56:29 -0500131 struct compat_stat tmp;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700132
Al Virofcf83062012-02-12 20:56:29 -0500133 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700134 return -EOVERFLOW;
135
Al Virofcf83062012-02-12 20:56:29 -0500136 memset(&tmp, 0, sizeof(tmp));
137 tmp.st_dev = old_encode_dev(stat->dev);
138 tmp.st_ino = stat->ino;
139 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
140 return -EOVERFLOW;
141 tmp.st_mode = stat->mode;
142 tmp.st_nlink = stat->nlink;
143 if (tmp.st_nlink != stat->nlink)
144 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800145 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
146 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Al Virofcf83062012-02-12 20:56:29 -0500147 tmp.st_rdev = old_encode_dev(stat->rdev);
148 if ((u64) stat->size > MAX_NON_LFS)
149 return -EOVERFLOW;
150 tmp.st_size = stat->size;
151 tmp.st_atime = stat->atime.tv_sec;
152 tmp.st_atime_nsec = stat->atime.tv_nsec;
153 tmp.st_mtime = stat->mtime.tv_sec;
154 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
155 tmp.st_ctime = stat->ctime.tv_sec;
156 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
157 tmp.st_blocks = stat->blocks;
158 tmp.st_blksize = stat->blksize;
159 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700160}
161
Heiko Carstens625b1d72014-03-04 10:53:50 +0100162COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
163 struct compat_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400166 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400168 error = vfs_stat(filename, &stat);
169 if (error)
170 return error;
171 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Heiko Carstens625b1d72014-03-04 10:53:50 +0100174COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
175 struct compat_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400178 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400180 error = vfs_lstat(filename, &stat);
181 if (error)
182 return error;
183 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Kyle McMartin82d821d2006-03-24 03:18:20 -0800186#ifndef __ARCH_WANT_STAT64
Heiko Carstens625b1d72014-03-04 10:53:50 +0100187COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
188 const char __user *, filename,
189 struct compat_stat __user *, statbuf, int, flag)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800190{
191 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400192 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800193
Oleg Drokin0112fc22009-04-08 20:05:42 +0400194 error = vfs_fstatat(dfd, filename, &stat, flag);
195 if (error)
196 return error;
197 return cp_compat_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800198}
Kyle McMartin82d821d2006-03-24 03:18:20 -0800199#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800200
Heiko Carstens625b1d72014-03-04 10:53:50 +0100201COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
202 struct compat_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
204 struct kstat stat;
205 int error = vfs_fstat(fd, &stat);
206
207 if (!error)
208 error = cp_compat_stat(&stat, statbuf);
209 return error;
210}
211
212static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
213{
214
215 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700216 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
217 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return -EOVERFLOW;
219 /* f_files and f_ffree may be -1; it's okay
220 * to stuff that into 32 bits */
221 if (kbuf->f_files != 0xffffffffffffffffULL
222 && (kbuf->f_files & 0xffffffff00000000ULL))
223 return -EOVERFLOW;
224 if (kbuf->f_ffree != 0xffffffffffffffffULL
225 && (kbuf->f_ffree & 0xffffffff00000000ULL))
226 return -EOVERFLOW;
227 }
228 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
229 __put_user(kbuf->f_type, &ubuf->f_type) ||
230 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
231 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
232 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
233 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
234 __put_user(kbuf->f_files, &ubuf->f_files) ||
235 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
236 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
237 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
238 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
239 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
Eric W. Biederman1448c722011-10-17 13:40:02 -0700240 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
241 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return -EFAULT;
243 return 0;
244}
245
246/*
Namhyung Kim974d8792010-12-27 01:41:53 +0900247 * The following statfs calls are copies of code from fs/statfs.c and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 * should be checked against those from time to time
249 */
Heiko Carstens625b1d72014-03-04 10:53:50 +0100250COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Al Viroc8b91ac2011-03-12 10:41:39 -0500252 struct kstatfs tmp;
253 int error = user_statfs(pathname, &tmp);
254 if (!error)
255 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 return error;
257}
258
Heiko Carstens625b1d72014-03-04 10:53:50 +0100259COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 struct kstatfs tmp;
Al Viroc8b91ac2011-03-12 10:41:39 -0500262 int error = fd_statfs(fd, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800263 if (!error)
264 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return error;
266}
267
268static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
269{
270 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700271 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
272 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return -EOVERFLOW;
274 /* f_files and f_ffree may be -1; it's okay
275 * to stuff that into 32 bits */
276 if (kbuf->f_files != 0xffffffffffffffffULL
277 && (kbuf->f_files & 0xffffffff00000000ULL))
278 return -EOVERFLOW;
279 if (kbuf->f_ffree != 0xffffffffffffffffULL
280 && (kbuf->f_ffree & 0xffffffff00000000ULL))
281 return -EOVERFLOW;
282 }
283 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
284 __put_user(kbuf->f_type, &ubuf->f_type) ||
285 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
286 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
287 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
288 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
289 __put_user(kbuf->f_files, &ubuf->f_files) ||
290 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
291 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
292 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
293 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
Namhyung Kime0bb6bd2010-12-27 01:41:54 +0900294 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
295 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
296 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 return -EFAULT;
298 return 0;
299}
300
Heiko Carstens625b1d72014-03-04 10:53:50 +0100301COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 struct kstatfs tmp;
304 int error;
305
306 if (sz != sizeof(*buf))
307 return -EINVAL;
308
Al Viroc8b91ac2011-03-12 10:41:39 -0500309 error = user_statfs(pathname, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800310 if (!error)
311 error = put_compat_statfs64(buf, &tmp);
Al Viroc8b91ac2011-03-12 10:41:39 -0500312 return error;
313}
314
Heiko Carstens625b1d72014-03-04 10:53:50 +0100315COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
Al Viroc8b91ac2011-03-12 10:41:39 -0500316{
317 struct kstatfs tmp;
318 int error;
319
320 if (sz != sizeof(*buf))
321 return -EINVAL;
322
323 error = fd_statfs(fd, &tmp);
324 if (!error)
325 error = put_compat_statfs64(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 return error;
327}
328
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100329/*
330 * This is a copy of sys_ustat, just dealing with a structure layout.
331 * Given how simple this syscall is that apporach is more maintainable
332 * than the various conversion hacks.
333 */
Heiko Carstens625b1d72014-03-04 10:53:50 +0100334COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100335{
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100336 struct compat_ustat tmp;
337 struct kstatfs sbuf;
Al Virocf31e702012-01-02 22:28:36 -0500338 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100339 if (err)
340 return err;
341
342 memset(&tmp, 0, sizeof(struct compat_ustat));
343 tmp.f_tfree = sbuf.f_bfree;
344 tmp.f_tinode = sbuf.f_ffree;
345 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
346 return -EFAULT;
347 return 0;
348}
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
351{
352 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
353 __get_user(kfl->l_type, &ufl->l_type) ||
354 __get_user(kfl->l_whence, &ufl->l_whence) ||
355 __get_user(kfl->l_start, &ufl->l_start) ||
356 __get_user(kfl->l_len, &ufl->l_len) ||
357 __get_user(kfl->l_pid, &ufl->l_pid))
358 return -EFAULT;
359 return 0;
360}
361
362static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
363{
364 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
365 __put_user(kfl->l_type, &ufl->l_type) ||
366 __put_user(kfl->l_whence, &ufl->l_whence) ||
367 __put_user(kfl->l_start, &ufl->l_start) ||
368 __put_user(kfl->l_len, &ufl->l_len) ||
369 __put_user(kfl->l_pid, &ufl->l_pid))
370 return -EFAULT;
371 return 0;
372}
373
374#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
375static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
376{
377 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
378 __get_user(kfl->l_type, &ufl->l_type) ||
379 __get_user(kfl->l_whence, &ufl->l_whence) ||
380 __get_user(kfl->l_start, &ufl->l_start) ||
381 __get_user(kfl->l_len, &ufl->l_len) ||
382 __get_user(kfl->l_pid, &ufl->l_pid))
383 return -EFAULT;
384 return 0;
385}
386#endif
387
388#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
389static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
390{
391 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
392 __put_user(kfl->l_type, &ufl->l_type) ||
393 __put_user(kfl->l_whence, &ufl->l_whence) ||
394 __put_user(kfl->l_start, &ufl->l_start) ||
395 __put_user(kfl->l_len, &ufl->l_len) ||
396 __put_user(kfl->l_pid, &ufl->l_pid))
397 return -EFAULT;
398 return 0;
399}
400#endif
401
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500402static unsigned int
403convert_fcntl_cmd(unsigned int cmd)
404{
405 switch (cmd) {
406 case F_GETLK64:
407 return F_GETLK;
408 case F_SETLK64:
409 return F_SETLK;
410 case F_SETLKW64:
411 return F_SETLKW;
412 }
413
414 return cmd;
415}
416
Heiko Carstens932602e2014-03-04 16:07:52 +0100417COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
418 compat_ulong_t, arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
420 mm_segment_t old_fs;
421 struct flock f;
422 long ret;
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500423 unsigned int conv_cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
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:
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500460 case F_GETLKP:
461 case F_SETLKP:
462 case F_SETLKPW:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 ret = get_compat_flock64(&f, compat_ptr(arg));
464 if (ret != 0)
465 break;
466 old_fs = get_fs();
467 set_fs(KERNEL_DS);
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500468 conv_cmd = convert_fcntl_cmd(cmd);
469 ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 set_fs(old_fs);
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500471 if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) {
NeilBrown2520f142006-01-08 01:02:40 -0800472 /* need to return lock information - see above for commentary */
473 if (f.l_start > COMPAT_LOFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800475 if (f.l_len > COMPAT_LOFF_T_MAX)
476 f.l_len = COMPAT_LOFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 if (ret == 0)
478 ret = put_compat_flock64(&f, compat_ptr(arg));
479 }
480 break;
481
482 default:
483 ret = sys_fcntl(fd, cmd, arg);
484 break;
485 }
486 return ret;
487}
488
Heiko Carstens932602e2014-03-04 16:07:52 +0100489COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
490 compat_ulong_t, arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500492 switch (cmd) {
493 case F_GETLK64:
494 case F_SETLK64:
495 case F_SETLKW64:
496 case F_GETLKP:
497 case F_SETLKP:
498 case F_SETLKPW:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 return -EINVAL;
Jeff Layton5d50ffd2014-02-03 12:13:10 -0500500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 return compat_sys_fcntl64(fd, cmd, arg);
502}
503
Heiko Carstens625b1d72014-03-04 10:53:50 +0100504COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_reqs, u32 __user *, ctx32p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
506 long ret;
507 aio_context_t ctx64;
508
509 mm_segment_t oldfs = get_fs();
510 if (unlikely(get_user(ctx64, ctx32p)))
511 return -EFAULT;
512
513 set_fs(KERNEL_DS);
514 /* The __user pointer cast is valid because of the set_fs() */
515 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
516 set_fs(oldfs);
517 /* truncating is ok because it's a user address */
518 if (!ret)
519 ret = put_user((u32) ctx64, ctx32p);
520 return ret;
521}
522
Heiko Carstens932602e2014-03-04 16:07:52 +0100523COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
524 compat_long_t, min_nr,
525 compat_long_t, nr,
526 struct io_event __user *, events,
527 struct compat_timespec __user *, timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 struct timespec t;
530 struct timespec __user *ut = NULL;
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (timeout) {
H. Peter Anvin81993e82014-02-01 18:54:11 -0800533 if (compat_get_timespec(&t, timeout))
Heiko Carstens932602e2014-03-04 16:07:52 +0100534 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 ut = compat_alloc_user_space(sizeof(*ut));
537 if (copy_to_user(ut, &t, sizeof(t)) )
Heiko Carstens932602e2014-03-04 16:07:52 +0100538 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
Heiko Carstens932602e2014-03-04 16:07:52 +0100540 return sys_io_getevents(ctx_id, min_nr, nr, events, ut);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
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 Yeohac34ebb2012-05-31 16:26:42 -0700549 struct iovec **ret_pointer)
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
Mathieu Desnoyers8aec0f52013-02-25 10:20:36 -0500575 ret = -EFAULT;
576 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
577 goto out;
578
Jeff Moyerb8373362010-05-26 14:44:25 -0700579 /*
580 * Single unix specification:
581 * We should -EINVAL if an element length is not >= 0 and fitting an
Linus Torvalds435f49a2010-10-29 10:36:49 -0700582 * ssize_t.
Jeff Moyerb8373362010-05-26 14:44:25 -0700583 *
Linus Torvalds435f49a2010-10-29 10:36:49 -0700584 * In Linux, the total length is limited to MAX_RW_COUNT, there is
585 * no overflow possibility.
Jeff Moyerb8373362010-05-26 14:44:25 -0700586 */
587 tot_len = 0;
588 ret = -EINVAL;
589 for (seg = 0; seg < nr_segs; seg++) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700590 compat_uptr_t buf;
591 compat_ssize_t len;
592
593 if (__get_user(len, &uvector->iov_len) ||
594 __get_user(buf, &uvector->iov_base)) {
595 ret = -EFAULT;
596 goto out;
597 }
598 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
599 goto out;
Christopher Yeohac34ebb2012-05-31 16:26:42 -0700600 if (type >= 0 &&
Christopher Yeohfcf63402011-10-31 17:06:39 -0700601 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700602 ret = -EFAULT;
603 goto out;
604 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700605 if (len > MAX_RW_COUNT - tot_len)
606 len = MAX_RW_COUNT - tot_len;
607 tot_len += len;
Jeff Moyerb8373362010-05-26 14:44:25 -0700608 iov->iov_base = compat_ptr(buf);
609 iov->iov_len = (compat_size_t) len;
610 uvector++;
611 iov++;
612 }
613 ret = tot_len;
614
615out:
616 return ret;
617}
618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619static inline long
620copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
621{
622 compat_uptr_t uptr;
623 int i;
624
625 for (i = 0; i < nr; ++i) {
626 if (get_user(uptr, ptr32 + i))
627 return -EFAULT;
628 if (put_user(compat_ptr(uptr), ptr64 + i))
629 return -EFAULT;
630 }
631 return 0;
632}
633
634#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
635
Heiko Carstens932602e2014-03-04 16:07:52 +0100636COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
637 int, nr, u32 __user *, iocb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 struct iocb __user * __user *iocb64;
640 long ret;
641
642 if (unlikely(nr < 0))
643 return -EINVAL;
644
645 if (nr > MAX_AIO_SUBMITS)
646 nr = MAX_AIO_SUBMITS;
647
648 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
649 ret = copy_iocb(nr, iocb, iocb64);
650 if (!ret)
Jeff Moyer9d85cba2010-05-26 14:44:26 -0700651 ret = do_io_submit(ctx_id, nr, iocb64, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return ret;
653}
654
655struct compat_ncp_mount_data {
656 compat_int_t version;
657 compat_uint_t ncp_fd;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700658 __compat_uid_t mounted_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 compat_pid_t wdog_pid;
660 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
661 compat_uint_t time_out;
662 compat_uint_t retry_count;
663 compat_uint_t flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700664 __compat_uid_t uid;
665 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 compat_mode_t file_mode;
667 compat_mode_t dir_mode;
668};
669
670struct compat_ncp_mount_data_v4 {
671 compat_int_t version;
672 compat_ulong_t flags;
673 compat_ulong_t mounted_uid;
674 compat_long_t wdog_pid;
675 compat_uint_t ncp_fd;
676 compat_uint_t time_out;
677 compat_uint_t retry_count;
678 compat_ulong_t uid;
679 compat_ulong_t gid;
680 compat_ulong_t file_mode;
681 compat_ulong_t dir_mode;
682};
683
684static void *do_ncp_super_data_conv(void *raw_data)
685{
686 int version = *(unsigned int *)raw_data;
687
688 if (version == 3) {
689 struct compat_ncp_mount_data *c_n = raw_data;
690 struct ncp_mount_data *n = raw_data;
691
692 n->dir_mode = c_n->dir_mode;
693 n->file_mode = c_n->file_mode;
694 n->gid = c_n->gid;
695 n->uid = c_n->uid;
696 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
697 n->wdog_pid = c_n->wdog_pid;
698 n->mounted_uid = c_n->mounted_uid;
699 } else if (version == 4) {
700 struct compat_ncp_mount_data_v4 *c_n = raw_data;
701 struct ncp_mount_data_v4 *n = raw_data;
702
703 n->dir_mode = c_n->dir_mode;
704 n->file_mode = c_n->file_mode;
705 n->gid = c_n->gid;
706 n->uid = c_n->uid;
707 n->retry_count = c_n->retry_count;
708 n->time_out = c_n->time_out;
709 n->ncp_fd = c_n->ncp_fd;
710 n->wdog_pid = c_n->wdog_pid;
711 n->mounted_uid = c_n->mounted_uid;
712 n->flags = c_n->flags;
713 } else if (version != 5) {
714 return NULL;
715 }
716
717 return raw_data;
718}
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
David Howells9a9947b2005-04-18 10:54:51 -0700721struct compat_nfs_string {
722 compat_uint_t len;
David Howells5fc3e622005-04-27 15:39:03 -0700723 compat_uptr_t data;
David Howells9a9947b2005-04-18 10:54:51 -0700724};
725
726static inline void compat_nfs_string(struct nfs_string *dst,
727 struct compat_nfs_string *src)
728{
729 dst->data = compat_ptr(src->data);
730 dst->len = src->len;
731}
732
733struct compat_nfs4_mount_data_v1 {
734 compat_int_t version;
735 compat_int_t flags;
736 compat_int_t rsize;
737 compat_int_t wsize;
738 compat_int_t timeo;
739 compat_int_t retrans;
740 compat_int_t acregmin;
741 compat_int_t acregmax;
742 compat_int_t acdirmin;
743 compat_int_t acdirmax;
744 struct compat_nfs_string client_addr;
745 struct compat_nfs_string mnt_path;
746 struct compat_nfs_string hostname;
747 compat_uint_t host_addrlen;
David Howells5fc3e622005-04-27 15:39:03 -0700748 compat_uptr_t host_addr;
David Howells9a9947b2005-04-18 10:54:51 -0700749 compat_int_t proto;
750 compat_int_t auth_flavourlen;
David Howells5fc3e622005-04-27 15:39:03 -0700751 compat_uptr_t auth_flavours;
David Howells9a9947b2005-04-18 10:54:51 -0700752};
753
754static int do_nfs4_super_data_conv(void *raw_data)
755{
756 int version = *(compat_uint_t *) raw_data;
757
758 if (version == 1) {
759 struct compat_nfs4_mount_data_v1 *raw = raw_data;
760 struct nfs4_mount_data *real = raw_data;
761
762 /* copy the fields backwards */
763 real->auth_flavours = compat_ptr(raw->auth_flavours);
764 real->auth_flavourlen = raw->auth_flavourlen;
765 real->proto = raw->proto;
766 real->host_addr = compat_ptr(raw->host_addr);
767 real->host_addrlen = raw->host_addrlen;
768 compat_nfs_string(&real->hostname, &raw->hostname);
769 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
770 compat_nfs_string(&real->client_addr, &raw->client_addr);
771 real->acdirmax = raw->acdirmax;
772 real->acdirmin = raw->acdirmin;
773 real->acregmax = raw->acregmax;
774 real->acregmin = raw->acregmin;
775 real->retrans = raw->retrans;
776 real->timeo = raw->timeo;
777 real->wsize = raw->wsize;
778 real->rsize = raw->rsize;
779 real->flags = raw->flags;
780 real->version = raw->version;
781 }
David Howells9a9947b2005-04-18 10:54:51 -0700782
783 return 0;
784}
785
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786#define NCPFS_NAME "ncpfs"
David Howells9a9947b2005-04-18 10:54:51 -0700787#define NFS4_NAME "nfs4"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Heiko Carstens932602e2014-03-04 16:07:52 +0100789COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
790 const char __user *, dir_name,
791 const char __user *, type, compat_ulong_t, flags,
792 const void __user *, data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
Vegard Nossumeca6f532009-09-18 13:05:45 -0700794 char *kernel_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 unsigned long data_page;
Vegard Nossumeca6f532009-09-18 13:05:45 -0700796 char *kernel_dev;
Jeff Layton91a27b22012-10-10 15:25:28 -0400797 struct filename *dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 int retval;
799
Vegard Nossumeca6f532009-09-18 13:05:45 -0700800 retval = copy_mount_string(type, &kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 if (retval < 0)
802 goto out;
803
Jeff Layton91a27b22012-10-10 15:25:28 -0400804 dir = getname(dir_name);
805 retval = PTR_ERR(dir);
806 if (IS_ERR(dir))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 goto out1;
808
Vegard Nossumeca6f532009-09-18 13:05:45 -0700809 retval = copy_mount_string(dev_name, &kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 if (retval < 0)
811 goto out2;
812
Vegard Nossumeca6f532009-09-18 13:05:45 -0700813 retval = copy_mount_options(data, &data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 if (retval < 0)
815 goto out3;
816
817 retval = -EINVAL;
818
Vegard Nossumeca6f532009-09-18 13:05:45 -0700819 if (kernel_type && data_page) {
Arnd Bergmann2116b7a2010-10-04 22:55:57 +0200820 if (!strcmp(kernel_type, NCPFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 do_ncp_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700822 } else if (!strcmp(kernel_type, NFS4_NAME)) {
David Howells9a9947b2005-04-18 10:54:51 -0700823 if (do_nfs4_super_data_conv((void *) data_page))
824 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 }
826 }
827
Jeff Layton91a27b22012-10-10 15:25:28 -0400828 retval = do_mount(kernel_dev, dir->name, kernel_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 flags, (void*)data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
David Howells9a9947b2005-04-18 10:54:51 -0700831 out4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 free_page(data_page);
833 out3:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700834 kfree(kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 out2:
Jeff Layton91a27b22012-10-10 15:25:28 -0400836 putname(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 out1:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700838 kfree(kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 out:
840 return retval;
841}
842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843struct compat_old_linux_dirent {
844 compat_ulong_t d_ino;
845 compat_ulong_t d_offset;
846 unsigned short d_namlen;
847 char d_name[1];
848};
849
850struct compat_readdir_callback {
Al Viro5c0ba4e2013-05-15 13:52:59 -0400851 struct dir_context ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 struct compat_old_linux_dirent __user *dirent;
853 int result;
854};
855
856static int compat_fillonedir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700857 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858{
859 struct compat_readdir_callback *buf = __buf;
860 struct compat_old_linux_dirent __user *dirent;
David Howellsafefdbb2006-10-03 01:13:46 -0700861 compat_ulong_t d_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863 if (buf->result)
864 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700865 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400866 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
867 buf->result = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700868 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 buf->result++;
871 dirent = buf->dirent;
872 if (!access_ok(VERIFY_WRITE, dirent,
873 (unsigned long)(dirent->d_name + namlen + 1) -
874 (unsigned long)dirent))
875 goto efault;
David Howellsafefdbb2006-10-03 01:13:46 -0700876 if ( __put_user(d_ino, &dirent->d_ino) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 __put_user(offset, &dirent->d_offset) ||
878 __put_user(namlen, &dirent->d_namlen) ||
879 __copy_to_user(dirent->d_name, name, namlen) ||
880 __put_user(0, dirent->d_name + namlen))
881 goto efault;
882 return 0;
883efault:
884 buf->result = -EFAULT;
885 return -EFAULT;
886}
887
Heiko Carstens625b1d72014-03-04 10:53:50 +0100888COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
889 struct compat_old_linux_dirent __user *, dirent, unsigned int, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890{
891 int error;
Al Viro2903ff02012-08-28 12:52:22 -0400892 struct fd f = fdget(fd);
Al Viroac6614b2013-05-22 22:22:04 -0400893 struct compat_readdir_callback buf = {
894 .ctx.actor = compat_fillonedir,
895 .dirent = dirent
896 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Al Viro2903ff02012-08-28 12:52:22 -0400898 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -0400899 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Al Viro5c0ba4e2013-05-15 13:52:59 -0400901 error = iterate_dir(f.file, &buf.ctx);
Al Viro53c9c5c2008-08-24 07:29:52 -0400902 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 error = buf.result;
904
Al Viro2903ff02012-08-28 12:52:22 -0400905 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 return error;
907}
908
909struct compat_linux_dirent {
910 compat_ulong_t d_ino;
911 compat_ulong_t d_off;
912 unsigned short d_reclen;
913 char d_name[1];
914};
915
916struct compat_getdents_callback {
Al Viro5c0ba4e2013-05-15 13:52:59 -0400917 struct dir_context ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 struct compat_linux_dirent __user *current_dir;
919 struct compat_linux_dirent __user *previous;
920 int count;
921 int error;
922};
923
924static int compat_filldir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700925 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
927 struct compat_linux_dirent __user * dirent;
928 struct compat_getdents_callback *buf = __buf;
David Howellsafefdbb2006-10-03 01:13:46 -0700929 compat_ulong_t d_ino;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700930 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
931 namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
933 buf->error = -EINVAL; /* only used if we fail.. */
934 if (reclen > buf->count)
935 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700936 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400937 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
938 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700939 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400940 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 dirent = buf->previous;
942 if (dirent) {
943 if (__put_user(offset, &dirent->d_off))
944 goto efault;
945 }
946 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700947 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 goto efault;
949 if (__put_user(reclen, &dirent->d_reclen))
950 goto efault;
951 if (copy_to_user(dirent->d_name, name, namlen))
952 goto efault;
953 if (__put_user(0, dirent->d_name + namlen))
954 goto efault;
955 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
956 goto efault;
957 buf->previous = dirent;
958 dirent = (void __user *)dirent + reclen;
959 buf->current_dir = dirent;
960 buf->count -= reclen;
961 return 0;
962efault:
963 buf->error = -EFAULT;
964 return -EFAULT;
965}
966
Heiko Carstens625b1d72014-03-04 10:53:50 +0100967COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
968 struct compat_linux_dirent __user *, dirent, unsigned int, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
Al Viro2903ff02012-08-28 12:52:22 -0400970 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 struct compat_linux_dirent __user * lastdirent;
Al Viroac6614b2013-05-22 22:22:04 -0400972 struct compat_getdents_callback buf = {
973 .ctx.actor = compat_filldir,
974 .current_dir = dirent,
975 .count = count
976 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 int error;
978
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (!access_ok(VERIFY_WRITE, dirent, count))
Al Viro863ced72012-04-21 18:40:32 -0400980 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Al Viro2903ff02012-08-28 12:52:22 -0400982 f = fdget(fd);
983 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -0400984 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Al Viro5c0ba4e2013-05-15 13:52:59 -0400986 error = iterate_dir(f.file, &buf.ctx);
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) {
Al Virobb6f6192013-05-15 18:49:12 -0400991 if (put_user(buf.ctx.pos, &lastdirent->d_off))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 error = -EFAULT;
993 else
994 error = count - buf.count;
995 }
Al Viro2903ff02012-08-28 12:52:22 -0400996 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 return error;
998}
999
Heiko Carstens0473c9b2014-03-03 10:44:03 +01001000#ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002struct compat_getdents_callback64 {
Al Viro5c0ba4e2013-05-15 13:52:59 -04001003 struct dir_context ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 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
Heiko Carstens625b1d72014-03-04 10:53:50 +01001052COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd,
1053 struct linux_dirent64 __user *, dirent, unsigned int, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054{
Al Viro2903ff02012-08-28 12:52:22 -04001055 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 struct linux_dirent64 __user * lastdirent;
Al Viroac6614b2013-05-22 22:22:04 -04001057 struct compat_getdents_callback64 buf = {
1058 .ctx.actor = compat_filldir64,
1059 .current_dir = dirent,
1060 .count = count
1061 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 int error;
1063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 if (!access_ok(VERIFY_WRITE, dirent, count))
Al Viro863ced72012-04-21 18:40:32 -04001065 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
Al Viro2903ff02012-08-28 12:52:22 -04001067 f = fdget(fd);
1068 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -04001069 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
Al Viro5c0ba4e2013-05-15 13:52:59 -04001071 error = iterate_dir(f.file, &buf.ctx);
Al Viro53c9c5c2008-08-24 07:29:52 -04001072 if (error >= 0)
1073 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 lastdirent = buf.previous;
1075 if (lastdirent) {
Al Virobb6f6192013-05-15 18:49:12 -04001076 typeof(lastdirent->d_off) d_off = buf.ctx.pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001077 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001078 error = -EFAULT;
1079 else
1080 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 }
Al Viro2903ff02012-08-28 12:52:22 -04001082 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 return error;
1084}
Heiko Carstens0473c9b2014-03-03 10:44:03 +01001085#endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001088 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1089 * O_LARGEFILE flag.
1090 */
Al Virof482e1b2012-12-25 20:24:38 -05001091COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
Miklos Szeredie922efc2005-09-06 15:18:25 -07001092{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001093 return do_sys_open(AT_FDCWD, filename, flags, mode);
1094}
1095
1096/*
1097 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1098 * O_LARGEFILE flag.
1099 */
Al Virof482e1b2012-12-25 20:24:38 -05001100COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001101{
1102 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001103}
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1106
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001107static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1108 int timeval, int ret)
1109{
1110 struct timespec ts;
1111
1112 if (!p)
1113 return ret;
1114
1115 if (current->personality & STICKY_TIMEOUTS)
1116 goto sticky;
1117
1118 /* No update for zero timeout */
1119 if (!end_time->tv_sec && !end_time->tv_nsec)
1120 return ret;
1121
1122 ktime_get_ts(&ts);
1123 ts = timespec_sub(*end_time, ts);
1124 if (ts.tv_sec < 0)
1125 ts.tv_sec = ts.tv_nsec = 0;
1126
1127 if (timeval) {
1128 struct compat_timeval rtv;
1129
1130 rtv.tv_sec = ts.tv_sec;
1131 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1132
1133 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1134 return ret;
1135 } else {
1136 struct compat_timespec rts;
1137
1138 rts.tv_sec = ts.tv_sec;
1139 rts.tv_nsec = ts.tv_nsec;
1140
1141 if (!copy_to_user(p, &rts, sizeof(rts)))
1142 return ret;
1143 }
1144 /*
1145 * If an application puts its timeval in read-only memory, we
1146 * don't want the Linux-specific update to the timeval to
1147 * cause a fault after the select has completed
1148 * successfully. However, because we're not updating the
1149 * timeval, we can't restart the system call.
1150 */
1151
1152sticky:
1153 if (ret == -ERESTARTNOHAND)
1154 ret = -EINTR;
1155 return ret;
1156}
1157
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158/*
1159 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1160 * 64-bit unsigned longs.
1161 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001162static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1164 unsigned long *fdset)
1165{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001166 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 if (ufdset) {
1168 unsigned long odd;
1169
1170 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1171 return -EFAULT;
1172
1173 odd = nr & 1UL;
1174 nr &= ~1UL;
1175 while (nr) {
1176 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001177 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1178 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 ufdset += 2;
1180 *fdset++ = h << 32 | l;
1181 nr -= 2;
1182 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001183 if (odd && __get_user(*fdset, ufdset))
1184 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 } else {
1186 /* Tricky, must clear full unsigned long in the
1187 * kernel fdset at the end, this makes sure that
1188 * actually happens.
1189 */
1190 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1191 }
1192 return 0;
1193}
1194
Arjan van de Ven858119e2006-01-14 13:20:43 -08001195static
Heiko Carstens7116e992006-12-06 20:36:36 -08001196int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1197 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198{
1199 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001200 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
1202 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001203 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
1205 odd = nr & 1UL;
1206 nr &= ~1UL;
1207 while (nr) {
1208 unsigned long h, l;
1209 l = *fdset++;
1210 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001211 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1212 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 ufdset += 2;
1214 nr -= 2;
1215 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001216 if (odd && __put_user(*fdset, ufdset))
1217 return -EFAULT;
1218 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219}
1220
1221
1222/*
1223 * This is a virtual copy of sys_select from fs/select.c and probably
1224 * should be compared to it from time to time
1225 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
1227/*
1228 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1229 * like to be certain this leads to no problems. So I return
1230 * EINTR just for safety.
1231 *
1232 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1233 * I'm trying ERESTARTNOHAND which restart only when you want to.
1234 */
David Woodhouse9f729492006-01-18 17:44:05 -08001235int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001236 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1237 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238{
1239 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001240 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001241 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001242 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001243 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 if (n < 0)
1246 goto out_nofds;
1247
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001248 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001249 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001250 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001251 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001252 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001253 if (n > max_fds)
1254 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256 /*
1257 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1258 * since we used fdset we need to allocate memory in units of
1259 * long-words.
1260 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001262 bits = stack_fds;
1263 if (size > sizeof(stack_fds) / 6) {
1264 bits = kmalloc(6 * size, GFP_KERNEL);
1265 ret = -ENOMEM;
1266 if (!bits)
1267 goto out_nofds;
1268 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 fds.in = (unsigned long *) bits;
1270 fds.out = (unsigned long *) (bits + size);
1271 fds.ex = (unsigned long *) (bits + 2*size);
1272 fds.res_in = (unsigned long *) (bits + 3*size);
1273 fds.res_out = (unsigned long *) (bits + 4*size);
1274 fds.res_ex = (unsigned long *) (bits + 5*size);
1275
1276 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1277 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1278 (ret = compat_get_fd_set(n, exp, fds.ex)))
1279 goto out;
1280 zero_fd_set(n, fds.res_in);
1281 zero_fd_set(n, fds.res_out);
1282 zero_fd_set(n, fds.res_ex);
1283
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001284 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
1286 if (ret < 0)
1287 goto out;
1288 if (!ret) {
1289 ret = -ERESTARTNOHAND;
1290 if (signal_pending(current))
1291 goto out;
1292 ret = 0;
1293 }
1294
Heiko Carstens7116e992006-12-06 20:36:36 -08001295 if (compat_set_fd_set(n, inp, fds.res_in) ||
1296 compat_set_fd_set(n, outp, fds.res_out) ||
1297 compat_set_fd_set(n, exp, fds.res_ex))
1298 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001300 if (bits != stack_fds)
1301 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302out_nofds:
1303 return ret;
1304}
1305
Heiko Carstens625b1d72014-03-04 10:53:50 +01001306COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp,
1307 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1308 struct compat_timeval __user *, tvp)
David Woodhouse9f729492006-01-18 17:44:05 -08001309{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001310 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001311 struct compat_timeval tv;
1312 int ret;
1313
1314 if (tvp) {
1315 if (copy_from_user(&tv, tvp, sizeof(tv)))
1316 return -EFAULT;
1317
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001318 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001319 if (poll_select_set_timeout(to,
1320 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1321 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001322 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001323 }
1324
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001325 ret = compat_core_sys_select(n, inp, outp, exp, to);
1326 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001327
1328 return ret;
1329}
1330
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001331struct compat_sel_arg_struct {
1332 compat_ulong_t n;
1333 compat_uptr_t inp;
1334 compat_uptr_t outp;
1335 compat_uptr_t exp;
1336 compat_uptr_t tvp;
1337};
1338
Heiko Carstens625b1d72014-03-04 10:53:50 +01001339COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg)
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001340{
1341 struct compat_sel_arg_struct a;
1342
1343 if (copy_from_user(&a, arg, sizeof(a)))
1344 return -EFAULT;
1345 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1346 compat_ptr(a.exp), compat_ptr(a.tvp));
1347}
1348
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001349static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001350 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1351 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1352 compat_size_t sigsetsize)
1353{
1354 compat_sigset_t ss32;
1355 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001356 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001357 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001358 int ret;
1359
1360 if (tsp) {
1361 if (copy_from_user(&ts, tsp, sizeof(ts)))
1362 return -EFAULT;
1363
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001364 to = &end_time;
1365 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001366 return -EINVAL;
1367 }
1368
1369 if (sigmask) {
1370 if (sigsetsize != sizeof(compat_sigset_t))
1371 return -EINVAL;
1372 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1373 return -EFAULT;
1374 sigset_from_compat(&ksigmask, &ss32);
1375
1376 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1377 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1378 }
1379
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001380 ret = compat_core_sys_select(n, inp, outp, exp, to);
1381 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001382
1383 if (ret == -ERESTARTNOHAND) {
1384 /*
1385 * Don't restore the signal mask yet. Let do_signal() deliver
1386 * the signal on the way back to userspace, before the signal
1387 * mask is restored.
1388 */
1389 if (sigmask) {
1390 memcpy(&current->saved_sigmask, &sigsaved,
1391 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001392 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001393 }
1394 } else if (sigmask)
1395 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1396
1397 return ret;
1398}
1399
Heiko Carstens625b1d72014-03-04 10:53:50 +01001400COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
1401 compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
1402 struct compat_timespec __user *, tsp, void __user *, sig)
David Woodhouse9f729492006-01-18 17:44:05 -08001403{
1404 compat_size_t sigsetsize = 0;
1405 compat_uptr_t up = 0;
1406
1407 if (sig) {
1408 if (!access_ok(VERIFY_READ, sig,
1409 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1410 __get_user(up, (compat_uptr_t __user *)sig) ||
1411 __get_user(sigsetsize,
1412 (compat_size_t __user *)(sig+sizeof(up))))
1413 return -EFAULT;
1414 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001415 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1416 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001417}
1418
Heiko Carstens625b1d72014-03-04 10:53:50 +01001419COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
1420 unsigned int, nfds, struct compat_timespec __user *, tsp,
1421 const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
David Woodhouse9f729492006-01-18 17:44:05 -08001422{
1423 compat_sigset_t ss32;
1424 sigset_t ksigmask, sigsaved;
1425 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001426 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001427 int ret;
1428
1429 if (tsp) {
1430 if (copy_from_user(&ts, tsp, sizeof(ts)))
1431 return -EFAULT;
1432
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001433 to = &end_time;
1434 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1435 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001436 }
1437
1438 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001439 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001440 return -EINVAL;
1441 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1442 return -EFAULT;
1443 sigset_from_compat(&ksigmask, &ss32);
1444
1445 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1446 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1447 }
1448
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001449 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001450
1451 /* We can restart this syscall, usually */
1452 if (ret == -EINTR) {
1453 /*
1454 * Don't restore the signal mask yet. Let do_signal() deliver
1455 * the signal on the way back to userspace, before the signal
1456 * mask is restored.
1457 */
1458 if (sigmask) {
1459 memcpy(&current->saved_sigmask, &sigsaved,
1460 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001461 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001462 }
1463 ret = -ERESTARTNOHAND;
1464 } else if (sigmask)
1465 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1466
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001467 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001468
1469 return ret;
1470}
David Woodhouse9f729492006-01-18 17:44:05 -08001471
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301472#ifdef CONFIG_FHANDLE
1473/*
1474 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1475 * doesn't set the O_LARGEFILE flag.
1476 */
Al Virof482e1b2012-12-25 20:24:38 -05001477COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
1478 struct file_handle __user *, handle, int, flags)
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301479{
1480 return do_handle_open(mountdirfd, handle, flags);
1481}
1482#endif