blob: f2944ace7a7b4a06a29880ed8c55cdd2cccb1ada [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 Viroa1f8e7f2006-10-19 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>
Davide Libenzif6dfb4f2007-03-07 20:41:21 -080047#include <linux/eventpoll.h>
Al Viro498052b2009-03-30 07:20:30 -040048#include <linux/fs_struct.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090049#include <linux/slab.h>
wu zhangjin504b7012010-10-30 08:19:35 -070050#include <linux/pagemap.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
Badari Pulavartyee0b3e62006-09-30 23:28:47 -070071#include "read_write.h"
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073/*
74 * Not all architectures have sys_utime, so implement this in terms
75 * of sys_utimes.
76 */
David Howellsc7887322010-08-11 11:26:22 +010077asmlinkage long compat_sys_utime(const char __user *filename,
78 struct compat_utimbuf __user *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
Ulrich Drepper1c710c82007-05-08 00:33:25 -070080 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 if (t) {
83 if (get_user(tv[0].tv_sec, &t->actime) ||
84 get_user(tv[1].tv_sec, &t->modtime))
85 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -070086 tv[0].tv_nsec = 0;
87 tv[1].tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -070089 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
90}
91
David Howellsc7887322010-08-11 11:26:22 +010092asmlinkage 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 -070093{
94 struct timespec tv[2];
95
96 if (t) {
97 if (get_compat_timespec(&tv[0], &t[0]) ||
98 get_compat_timespec(&tv[1], &t[1]))
99 return -EFAULT;
100
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700101 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
102 return 0;
103 }
104 return do_utimes(dfd, filename, t ? tv : NULL, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
David Howellsc7887322010-08-11 11:26:22 +0100107asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700109 struct timespec tv[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100111 if (t) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700113 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700115 get_user(tv[1].tv_nsec, &t[1].tv_usec))
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100116 return -EFAULT;
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700117 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
118 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
119 return -EINVAL;
120 tv[0].tv_nsec *= 1000;
121 tv[1].tv_nsec *= 1000;
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100122 }
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700123 return do_utimes(dfd, filename, t ? tv : NULL, 0);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800124}
125
David Howellsc7887322010-08-11 11:26:22 +0100126asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800127{
128 return compat_sys_futimesat(AT_FDCWD, filename, t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700131static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
132{
Al Virofcf83062012-02-12 20:56:29 -0500133 struct compat_stat tmp;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700134
Al Virofcf83062012-02-12 20:56:29 -0500135 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700136 return -EOVERFLOW;
137
Al Virofcf83062012-02-12 20:56:29 -0500138 memset(&tmp, 0, sizeof(tmp));
139 tmp.st_dev = old_encode_dev(stat->dev);
140 tmp.st_ino = stat->ino;
141 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
142 return -EOVERFLOW;
143 tmp.st_mode = stat->mode;
144 tmp.st_nlink = stat->nlink;
145 if (tmp.st_nlink != stat->nlink)
146 return -EOVERFLOW;
147 SET_UID(tmp.st_uid, stat->uid);
148 SET_GID(tmp.st_gid, stat->gid);
149 tmp.st_rdev = old_encode_dev(stat->rdev);
150 if ((u64) stat->size > MAX_NON_LFS)
151 return -EOVERFLOW;
152 tmp.st_size = stat->size;
153 tmp.st_atime = stat->atime.tv_sec;
154 tmp.st_atime_nsec = stat->atime.tv_nsec;
155 tmp.st_mtime = stat->mtime.tv_sec;
156 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
157 tmp.st_ctime = stat->ctime.tv_sec;
158 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
159 tmp.st_blocks = stat->blocks;
160 tmp.st_blksize = stat->blksize;
161 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
Christoph Hellwigf7a50002008-10-15 22:02:05 -0700162}
163
David Howellsc7887322010-08-11 11:26:22 +0100164asmlinkage long compat_sys_newstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 struct compat_stat __user *statbuf)
166{
167 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400168 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400170 error = vfs_stat(filename, &stat);
171 if (error)
172 return error;
173 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
David Howellsc7887322010-08-11 11:26:22 +0100176asmlinkage long compat_sys_newlstat(const char __user * filename,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 struct compat_stat __user *statbuf)
178{
179 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400180 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400182 error = vfs_lstat(filename, &stat);
183 if (error)
184 return error;
185 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Kyle McMartin82d821d2006-03-24 03:18:20 -0800188#ifndef __ARCH_WANT_STAT64
David Howellsc7887322010-08-11 11:26:22 +0100189asmlinkage long compat_sys_newfstatat(unsigned int dfd,
190 const char __user *filename,
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800191 struct compat_stat __user *statbuf, int flag)
192{
193 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400194 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800195
Oleg Drokin0112fc22009-04-08 20:05:42 +0400196 error = vfs_fstatat(dfd, filename, &stat, flag);
197 if (error)
198 return error;
199 return cp_compat_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800200}
Kyle McMartin82d821d2006-03-24 03:18:20 -0800201#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203asmlinkage long compat_sys_newfstat(unsigned int fd,
204 struct compat_stat __user * statbuf)
205{
206 struct kstat stat;
207 int error = vfs_fstat(fd, &stat);
208
209 if (!error)
210 error = cp_compat_stat(&stat, statbuf);
211 return error;
212}
213
214static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
215{
216
217 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700218 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
219 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return -EOVERFLOW;
221 /* f_files and f_ffree may be -1; it's okay
222 * to stuff that into 32 bits */
223 if (kbuf->f_files != 0xffffffffffffffffULL
224 && (kbuf->f_files & 0xffffffff00000000ULL))
225 return -EOVERFLOW;
226 if (kbuf->f_ffree != 0xffffffffffffffffULL
227 && (kbuf->f_ffree & 0xffffffff00000000ULL))
228 return -EOVERFLOW;
229 }
230 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
231 __put_user(kbuf->f_type, &ubuf->f_type) ||
232 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
233 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
234 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
235 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
236 __put_user(kbuf->f_files, &ubuf->f_files) ||
237 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
238 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
239 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
240 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
241 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
Eric W. Biederman1448c722011-10-17 13:40:02 -0700242 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
243 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return -EFAULT;
245 return 0;
246}
247
248/*
Namhyung Kim974d8792010-12-27 01:41:53 +0900249 * The following statfs calls are copies of code from fs/statfs.c and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 * should be checked against those from time to time
251 */
Al Viro2d8f3032008-07-22 09:59:21 -0400252asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Al Viroc8b91ac2011-03-12 10:41:39 -0500254 struct kstatfs tmp;
255 int error = user_statfs(pathname, &tmp);
256 if (!error)
257 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return error;
259}
260
261asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
262{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 struct kstatfs tmp;
Al Viroc8b91ac2011-03-12 10:41:39 -0500264 int error = fd_statfs(fd, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800265 if (!error)
266 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 return error;
268}
269
270static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
271{
272 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700273 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
274 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return -EOVERFLOW;
276 /* f_files and f_ffree may be -1; it's okay
277 * to stuff that into 32 bits */
278 if (kbuf->f_files != 0xffffffffffffffffULL
279 && (kbuf->f_files & 0xffffffff00000000ULL))
280 return -EOVERFLOW;
281 if (kbuf->f_ffree != 0xffffffffffffffffULL
282 && (kbuf->f_ffree & 0xffffffff00000000ULL))
283 return -EOVERFLOW;
284 }
285 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
286 __put_user(kbuf->f_type, &ubuf->f_type) ||
287 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
288 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
289 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
290 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
291 __put_user(kbuf->f_files, &ubuf->f_files) ||
292 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
293 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
294 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
295 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
Namhyung Kime0bb6bd2010-12-27 01:41:54 +0900296 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
297 __put_user(kbuf->f_flags, &ubuf->f_flags) ||
298 __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return -EFAULT;
300 return 0;
301}
302
Al Viro2d8f3032008-07-22 09:59:21 -0400303asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 struct kstatfs tmp;
306 int error;
307
308 if (sz != sizeof(*buf))
309 return -EINVAL;
310
Al Viroc8b91ac2011-03-12 10:41:39 -0500311 error = user_statfs(pathname, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800312 if (!error)
313 error = put_compat_statfs64(buf, &tmp);
Al Viroc8b91ac2011-03-12 10:41:39 -0500314 return error;
315}
316
317asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
318{
319 struct kstatfs tmp;
320 int error;
321
322 if (sz != sizeof(*buf))
323 return -EINVAL;
324
325 error = fd_statfs(fd, &tmp);
326 if (!error)
327 error = put_compat_statfs64(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 return error;
329}
330
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100331/*
332 * This is a copy of sys_ustat, just dealing with a structure layout.
333 * Given how simple this syscall is that apporach is more maintainable
334 * than the various conversion hacks.
335 */
336asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
337{
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100338 struct compat_ustat tmp;
339 struct kstatfs sbuf;
Al Virocf31e702012-01-02 22:28:36 -0500340 int err = vfs_ustat(new_decode_dev(dev), &sbuf);
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100341 if (err)
342 return err;
343
344 memset(&tmp, 0, sizeof(struct compat_ustat));
345 tmp.f_tfree = sbuf.f_bfree;
346 tmp.f_tinode = sbuf.f_ffree;
347 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
348 return -EFAULT;
349 return 0;
350}
351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
353{
354 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
355 __get_user(kfl->l_type, &ufl->l_type) ||
356 __get_user(kfl->l_whence, &ufl->l_whence) ||
357 __get_user(kfl->l_start, &ufl->l_start) ||
358 __get_user(kfl->l_len, &ufl->l_len) ||
359 __get_user(kfl->l_pid, &ufl->l_pid))
360 return -EFAULT;
361 return 0;
362}
363
364static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
365{
366 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
367 __put_user(kfl->l_type, &ufl->l_type) ||
368 __put_user(kfl->l_whence, &ufl->l_whence) ||
369 __put_user(kfl->l_start, &ufl->l_start) ||
370 __put_user(kfl->l_len, &ufl->l_len) ||
371 __put_user(kfl->l_pid, &ufl->l_pid))
372 return -EFAULT;
373 return 0;
374}
375
376#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
377static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
378{
379 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
380 __get_user(kfl->l_type, &ufl->l_type) ||
381 __get_user(kfl->l_whence, &ufl->l_whence) ||
382 __get_user(kfl->l_start, &ufl->l_start) ||
383 __get_user(kfl->l_len, &ufl->l_len) ||
384 __get_user(kfl->l_pid, &ufl->l_pid))
385 return -EFAULT;
386 return 0;
387}
388#endif
389
390#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
391static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
392{
393 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
394 __put_user(kfl->l_type, &ufl->l_type) ||
395 __put_user(kfl->l_whence, &ufl->l_whence) ||
396 __put_user(kfl->l_start, &ufl->l_start) ||
397 __put_user(kfl->l_len, &ufl->l_len) ||
398 __put_user(kfl->l_pid, &ufl->l_pid))
399 return -EFAULT;
400 return 0;
401}
402#endif
403
404asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
405 unsigned long arg)
406{
407 mm_segment_t old_fs;
408 struct flock f;
409 long ret;
410
411 switch (cmd) {
412 case F_GETLK:
413 case F_SETLK:
414 case F_SETLKW:
415 ret = get_compat_flock(&f, compat_ptr(arg));
416 if (ret != 0)
417 break;
418 old_fs = get_fs();
419 set_fs(KERNEL_DS);
420 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
421 set_fs(old_fs);
422 if (cmd == F_GETLK && ret == 0) {
Nikanth Karthikesanff677f82009-04-01 14:40:51 +0530423 /* GETLK was successful and we need to return the data...
NeilBrown2520f142006-01-08 01:02:40 -0800424 * but it needs to fit in the compat structure.
425 * l_start shouldn't be too big, unless the original
426 * start + end is greater than COMPAT_OFF_T_MAX, in which
427 * case the app was asking for trouble, so we return
428 * -EOVERFLOW in that case.
429 * l_len could be too big, in which case we just truncate it,
430 * and only allow the app to see that part of the conflicting
431 * lock that might make sense to it anyway
432 */
433
434 if (f.l_start > COMPAT_OFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800436 if (f.l_len > COMPAT_OFF_T_MAX)
437 f.l_len = COMPAT_OFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 if (ret == 0)
439 ret = put_compat_flock(&f, compat_ptr(arg));
440 }
441 break;
442
443 case F_GETLK64:
444 case F_SETLK64:
445 case F_SETLKW64:
446 ret = get_compat_flock64(&f, compat_ptr(arg));
447 if (ret != 0)
448 break;
449 old_fs = get_fs();
450 set_fs(KERNEL_DS);
451 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
452 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
453 (unsigned long)&f);
454 set_fs(old_fs);
455 if (cmd == F_GETLK64 && ret == 0) {
NeilBrown2520f142006-01-08 01:02:40 -0800456 /* need to return lock information - see above for commentary */
457 if (f.l_start > COMPAT_LOFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800459 if (f.l_len > COMPAT_LOFF_T_MAX)
460 f.l_len = COMPAT_LOFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 if (ret == 0)
462 ret = put_compat_flock64(&f, compat_ptr(arg));
463 }
464 break;
465
466 default:
467 ret = sys_fcntl(fd, cmd, arg);
468 break;
469 }
470 return ret;
471}
472
473asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
474 unsigned long arg)
475{
476 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
477 return -EINVAL;
478 return compat_sys_fcntl64(fd, cmd, arg);
479}
480
481asmlinkage long
482compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
483{
484 long ret;
485 aio_context_t ctx64;
486
487 mm_segment_t oldfs = get_fs();
488 if (unlikely(get_user(ctx64, ctx32p)))
489 return -EFAULT;
490
491 set_fs(KERNEL_DS);
492 /* The __user pointer cast is valid because of the set_fs() */
493 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
494 set_fs(oldfs);
495 /* truncating is ok because it's a user address */
496 if (!ret)
497 ret = put_user((u32) ctx64, ctx32p);
498 return ret;
499}
500
501asmlinkage long
502compat_sys_io_getevents(aio_context_t ctx_id,
503 unsigned long min_nr,
504 unsigned long nr,
505 struct io_event __user *events,
506 struct compat_timespec __user *timeout)
507{
508 long ret;
509 struct timespec t;
510 struct timespec __user *ut = NULL;
511
512 ret = -EFAULT;
513 if (unlikely(!access_ok(VERIFY_WRITE, events,
514 nr * sizeof(struct io_event))))
515 goto out;
516 if (timeout) {
517 if (get_compat_timespec(&t, timeout))
518 goto out;
519
520 ut = compat_alloc_user_space(sizeof(*ut));
521 if (copy_to_user(ut, &t, sizeof(t)) )
522 goto out;
523 }
524 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
525out:
526 return ret;
527}
528
Jeff Moyerb8373362010-05-26 14:44:25 -0700529/* A write operation does a read from user space and vice versa */
530#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
531
532ssize_t compat_rw_copy_check_uvector(int type,
533 const struct compat_iovec __user *uvector, unsigned long nr_segs,
534 unsigned long fast_segs, struct iovec *fast_pointer,
Christopher Yeohfcf63402011-10-31 17:06:39 -0700535 struct iovec **ret_pointer, int check_access)
Jeff Moyerb8373362010-05-26 14:44:25 -0700536{
537 compat_ssize_t tot_len;
538 struct iovec *iov = *ret_pointer = fast_pointer;
539 ssize_t ret = 0;
540 int seg;
541
542 /*
543 * SuS says "The readv() function *may* fail if the iovcnt argument
544 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
545 * traditionally returned zero for zero segments, so...
546 */
547 if (nr_segs == 0)
548 goto out;
549
550 ret = -EINVAL;
551 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
552 goto out;
553 if (nr_segs > fast_segs) {
554 ret = -ENOMEM;
555 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
Namhyung Kim6a5640f2010-12-27 01:41:52 +0900556 if (iov == NULL)
Jeff Moyerb8373362010-05-26 14:44:25 -0700557 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -0700558 }
559 *ret_pointer = iov;
560
561 /*
562 * Single unix specification:
563 * We should -EINVAL if an element length is not >= 0 and fitting an
Linus Torvalds435f49a2010-10-29 10:36:49 -0700564 * ssize_t.
Jeff Moyerb8373362010-05-26 14:44:25 -0700565 *
Linus Torvalds435f49a2010-10-29 10:36:49 -0700566 * In Linux, the total length is limited to MAX_RW_COUNT, there is
567 * no overflow possibility.
Jeff Moyerb8373362010-05-26 14:44:25 -0700568 */
569 tot_len = 0;
570 ret = -EINVAL;
571 for (seg = 0; seg < nr_segs; seg++) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700572 compat_uptr_t buf;
573 compat_ssize_t len;
574
575 if (__get_user(len, &uvector->iov_len) ||
576 __get_user(buf, &uvector->iov_base)) {
577 ret = -EFAULT;
578 goto out;
579 }
580 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
581 goto out;
Christopher Yeohfcf63402011-10-31 17:06:39 -0700582 if (check_access &&
583 !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
Jeff Moyerb8373362010-05-26 14:44:25 -0700584 ret = -EFAULT;
585 goto out;
586 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700587 if (len > MAX_RW_COUNT - tot_len)
588 len = MAX_RW_COUNT - tot_len;
589 tot_len += len;
Jeff Moyerb8373362010-05-26 14:44:25 -0700590 iov->iov_base = compat_ptr(buf);
591 iov->iov_len = (compat_size_t) len;
592 uvector++;
593 iov++;
594 }
595 ret = tot_len;
596
597out:
598 return ret;
599}
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601static inline long
602copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
603{
604 compat_uptr_t uptr;
605 int i;
606
607 for (i = 0; i < nr; ++i) {
608 if (get_user(uptr, ptr32 + i))
609 return -EFAULT;
610 if (put_user(compat_ptr(uptr), ptr64 + i))
611 return -EFAULT;
612 }
613 return 0;
614}
615
616#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
617
618asmlinkage long
619compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
620{
621 struct iocb __user * __user *iocb64;
622 long ret;
623
624 if (unlikely(nr < 0))
625 return -EINVAL;
626
627 if (nr > MAX_AIO_SUBMITS)
628 nr = MAX_AIO_SUBMITS;
629
630 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
631 ret = copy_iocb(nr, iocb, iocb64);
632 if (!ret)
Jeff Moyer9d85cba2010-05-26 14:44:26 -0700633 ret = do_io_submit(ctx_id, nr, iocb64, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return ret;
635}
636
637struct compat_ncp_mount_data {
638 compat_int_t version;
639 compat_uint_t ncp_fd;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700640 __compat_uid_t mounted_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 compat_pid_t wdog_pid;
642 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
643 compat_uint_t time_out;
644 compat_uint_t retry_count;
645 compat_uint_t flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700646 __compat_uid_t uid;
647 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 compat_mode_t file_mode;
649 compat_mode_t dir_mode;
650};
651
652struct compat_ncp_mount_data_v4 {
653 compat_int_t version;
654 compat_ulong_t flags;
655 compat_ulong_t mounted_uid;
656 compat_long_t wdog_pid;
657 compat_uint_t ncp_fd;
658 compat_uint_t time_out;
659 compat_uint_t retry_count;
660 compat_ulong_t uid;
661 compat_ulong_t gid;
662 compat_ulong_t file_mode;
663 compat_ulong_t dir_mode;
664};
665
666static void *do_ncp_super_data_conv(void *raw_data)
667{
668 int version = *(unsigned int *)raw_data;
669
670 if (version == 3) {
671 struct compat_ncp_mount_data *c_n = raw_data;
672 struct ncp_mount_data *n = raw_data;
673
674 n->dir_mode = c_n->dir_mode;
675 n->file_mode = c_n->file_mode;
676 n->gid = c_n->gid;
677 n->uid = c_n->uid;
678 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
679 n->wdog_pid = c_n->wdog_pid;
680 n->mounted_uid = c_n->mounted_uid;
681 } else if (version == 4) {
682 struct compat_ncp_mount_data_v4 *c_n = raw_data;
683 struct ncp_mount_data_v4 *n = raw_data;
684
685 n->dir_mode = c_n->dir_mode;
686 n->file_mode = c_n->file_mode;
687 n->gid = c_n->gid;
688 n->uid = c_n->uid;
689 n->retry_count = c_n->retry_count;
690 n->time_out = c_n->time_out;
691 n->ncp_fd = c_n->ncp_fd;
692 n->wdog_pid = c_n->wdog_pid;
693 n->mounted_uid = c_n->mounted_uid;
694 n->flags = c_n->flags;
695 } else if (version != 5) {
696 return NULL;
697 }
698
699 return raw_data;
700}
701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
David Howells9a9947b2005-04-18 10:54:51 -0700703struct compat_nfs_string {
704 compat_uint_t len;
David Howells5fc3e622005-04-27 15:39:03 -0700705 compat_uptr_t data;
David Howells9a9947b2005-04-18 10:54:51 -0700706};
707
708static inline void compat_nfs_string(struct nfs_string *dst,
709 struct compat_nfs_string *src)
710{
711 dst->data = compat_ptr(src->data);
712 dst->len = src->len;
713}
714
715struct compat_nfs4_mount_data_v1 {
716 compat_int_t version;
717 compat_int_t flags;
718 compat_int_t rsize;
719 compat_int_t wsize;
720 compat_int_t timeo;
721 compat_int_t retrans;
722 compat_int_t acregmin;
723 compat_int_t acregmax;
724 compat_int_t acdirmin;
725 compat_int_t acdirmax;
726 struct compat_nfs_string client_addr;
727 struct compat_nfs_string mnt_path;
728 struct compat_nfs_string hostname;
729 compat_uint_t host_addrlen;
David Howells5fc3e622005-04-27 15:39:03 -0700730 compat_uptr_t host_addr;
David Howells9a9947b2005-04-18 10:54:51 -0700731 compat_int_t proto;
732 compat_int_t auth_flavourlen;
David Howells5fc3e622005-04-27 15:39:03 -0700733 compat_uptr_t auth_flavours;
David Howells9a9947b2005-04-18 10:54:51 -0700734};
735
736static int do_nfs4_super_data_conv(void *raw_data)
737{
738 int version = *(compat_uint_t *) raw_data;
739
740 if (version == 1) {
741 struct compat_nfs4_mount_data_v1 *raw = raw_data;
742 struct nfs4_mount_data *real = raw_data;
743
744 /* copy the fields backwards */
745 real->auth_flavours = compat_ptr(raw->auth_flavours);
746 real->auth_flavourlen = raw->auth_flavourlen;
747 real->proto = raw->proto;
748 real->host_addr = compat_ptr(raw->host_addr);
749 real->host_addrlen = raw->host_addrlen;
750 compat_nfs_string(&real->hostname, &raw->hostname);
751 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
752 compat_nfs_string(&real->client_addr, &raw->client_addr);
753 real->acdirmax = raw->acdirmax;
754 real->acdirmin = raw->acdirmin;
755 real->acregmax = raw->acregmax;
756 real->acregmin = raw->acregmin;
757 real->retrans = raw->retrans;
758 real->timeo = raw->timeo;
759 real->wsize = raw->wsize;
760 real->rsize = raw->rsize;
761 real->flags = raw->flags;
762 real->version = raw->version;
763 }
David Howells9a9947b2005-04-18 10:54:51 -0700764
765 return 0;
766}
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768#define NCPFS_NAME "ncpfs"
David Howells9a9947b2005-04-18 10:54:51 -0700769#define NFS4_NAME "nfs4"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
David Howellsc7887322010-08-11 11:26:22 +0100771asmlinkage long compat_sys_mount(const char __user * dev_name,
772 const char __user * dir_name,
773 const char __user * type, unsigned long flags,
774 const void __user * data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775{
Vegard Nossumeca6f532009-09-18 13:05:45 -0700776 char *kernel_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 unsigned long data_page;
Vegard Nossumeca6f532009-09-18 13:05:45 -0700778 char *kernel_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 char *dir_page;
780 int retval;
781
Vegard Nossumeca6f532009-09-18 13:05:45 -0700782 retval = copy_mount_string(type, &kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 if (retval < 0)
784 goto out;
785
786 dir_page = getname(dir_name);
787 retval = PTR_ERR(dir_page);
788 if (IS_ERR(dir_page))
789 goto out1;
790
Vegard Nossumeca6f532009-09-18 13:05:45 -0700791 retval = copy_mount_string(dev_name, &kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 if (retval < 0)
793 goto out2;
794
Vegard Nossumeca6f532009-09-18 13:05:45 -0700795 retval = copy_mount_options(data, &data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 if (retval < 0)
797 goto out3;
798
799 retval = -EINVAL;
800
Vegard Nossumeca6f532009-09-18 13:05:45 -0700801 if (kernel_type && data_page) {
Arnd Bergmann2116b7a2010-10-04 22:55:57 +0200802 if (!strcmp(kernel_type, NCPFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 do_ncp_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700804 } else if (!strcmp(kernel_type, NFS4_NAME)) {
David Howells9a9947b2005-04-18 10:54:51 -0700805 if (do_nfs4_super_data_conv((void *) data_page))
806 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808 }
809
Vegard Nossumeca6f532009-09-18 13:05:45 -0700810 retval = do_mount(kernel_dev, dir_page, kernel_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 flags, (void*)data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
David Howells9a9947b2005-04-18 10:54:51 -0700813 out4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 free_page(data_page);
815 out3:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700816 kfree(kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 out2:
818 putname(dir_page);
819 out1:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700820 kfree(kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 out:
822 return retval;
823}
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825struct compat_old_linux_dirent {
826 compat_ulong_t d_ino;
827 compat_ulong_t d_offset;
828 unsigned short d_namlen;
829 char d_name[1];
830};
831
832struct compat_readdir_callback {
833 struct compat_old_linux_dirent __user *dirent;
834 int result;
835};
836
837static int compat_fillonedir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700838 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
840 struct compat_readdir_callback *buf = __buf;
841 struct compat_old_linux_dirent __user *dirent;
David Howellsafefdbb2006-10-03 01:13:46 -0700842 compat_ulong_t d_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 if (buf->result)
845 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700846 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400847 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
848 buf->result = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700849 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400850 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 buf->result++;
852 dirent = buf->dirent;
853 if (!access_ok(VERIFY_WRITE, dirent,
854 (unsigned long)(dirent->d_name + namlen + 1) -
855 (unsigned long)dirent))
856 goto efault;
David Howellsafefdbb2006-10-03 01:13:46 -0700857 if ( __put_user(d_ino, &dirent->d_ino) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 __put_user(offset, &dirent->d_offset) ||
859 __put_user(namlen, &dirent->d_namlen) ||
860 __copy_to_user(dirent->d_name, name, namlen) ||
861 __put_user(0, dirent->d_name + namlen))
862 goto efault;
863 return 0;
864efault:
865 buf->result = -EFAULT;
866 return -EFAULT;
867}
868
869asmlinkage long compat_sys_old_readdir(unsigned int fd,
870 struct compat_old_linux_dirent __user *dirent, unsigned int count)
871{
872 int error;
873 struct file *file;
874 struct compat_readdir_callback buf;
875
876 error = -EBADF;
877 file = fget(fd);
878 if (!file)
879 goto out;
880
881 buf.result = 0;
882 buf.dirent = dirent;
883
884 error = vfs_readdir(file, compat_fillonedir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400885 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 error = buf.result;
887
888 fput(file);
889out:
890 return error;
891}
892
893struct compat_linux_dirent {
894 compat_ulong_t d_ino;
895 compat_ulong_t d_off;
896 unsigned short d_reclen;
897 char d_name[1];
898};
899
900struct compat_getdents_callback {
901 struct compat_linux_dirent __user *current_dir;
902 struct compat_linux_dirent __user *previous;
903 int count;
904 int error;
905};
906
907static int compat_filldir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700908 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
910 struct compat_linux_dirent __user * dirent;
911 struct compat_getdents_callback *buf = __buf;
David Howellsafefdbb2006-10-03 01:13:46 -0700912 compat_ulong_t d_ino;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700913 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
914 namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 buf->error = -EINVAL; /* only used if we fail.. */
917 if (reclen > buf->count)
918 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700919 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400920 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
921 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700922 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400923 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 dirent = buf->previous;
925 if (dirent) {
926 if (__put_user(offset, &dirent->d_off))
927 goto efault;
928 }
929 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700930 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 goto efault;
932 if (__put_user(reclen, &dirent->d_reclen))
933 goto efault;
934 if (copy_to_user(dirent->d_name, name, namlen))
935 goto efault;
936 if (__put_user(0, dirent->d_name + namlen))
937 goto efault;
938 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
939 goto efault;
940 buf->previous = dirent;
941 dirent = (void __user *)dirent + reclen;
942 buf->current_dir = dirent;
943 buf->count -= reclen;
944 return 0;
945efault:
946 buf->error = -EFAULT;
947 return -EFAULT;
948}
949
950asmlinkage long compat_sys_getdents(unsigned int fd,
951 struct compat_linux_dirent __user *dirent, unsigned int count)
952{
953 struct file * file;
954 struct compat_linux_dirent __user * lastdirent;
955 struct compat_getdents_callback buf;
956 int error;
957
958 error = -EFAULT;
959 if (!access_ok(VERIFY_WRITE, dirent, count))
960 goto out;
961
962 error = -EBADF;
963 file = fget(fd);
964 if (!file)
965 goto out;
966
967 buf.current_dir = dirent;
968 buf.previous = NULL;
969 buf.count = count;
970 buf.error = 0;
971
972 error = vfs_readdir(file, compat_filldir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400973 if (error >= 0)
974 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 lastdirent = buf.previous;
976 if (lastdirent) {
977 if (put_user(file->f_pos, &lastdirent->d_off))
978 error = -EFAULT;
979 else
980 error = count - buf.count;
981 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 fput(file);
983out:
984 return error;
985}
986
987#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989struct compat_getdents_callback64 {
990 struct linux_dirent64 __user *current_dir;
991 struct linux_dirent64 __user *previous;
992 int count;
993 int error;
994};
995
996static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
David Howellsafefdbb2006-10-03 01:13:46 -0700997 u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998{
999 struct linux_dirent64 __user *dirent;
1000 struct compat_getdents_callback64 *buf = __buf;
Kevin Winchester85c9fe82010-08-09 17:20:22 -07001001 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1002 sizeof(u64));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 u64 off;
1004
1005 buf->error = -EINVAL; /* only used if we fail.. */
1006 if (reclen > buf->count)
1007 return -EINVAL;
1008 dirent = buf->previous;
1009
1010 if (dirent) {
1011 if (__put_user_unaligned(offset, &dirent->d_off))
1012 goto efault;
1013 }
1014 dirent = buf->current_dir;
1015 if (__put_user_unaligned(ino, &dirent->d_ino))
1016 goto efault;
1017 off = 0;
1018 if (__put_user_unaligned(off, &dirent->d_off))
1019 goto efault;
1020 if (__put_user(reclen, &dirent->d_reclen))
1021 goto efault;
1022 if (__put_user(d_type, &dirent->d_type))
1023 goto efault;
1024 if (copy_to_user(dirent->d_name, name, namlen))
1025 goto efault;
1026 if (__put_user(0, dirent->d_name + namlen))
1027 goto efault;
1028 buf->previous = dirent;
1029 dirent = (void __user *)dirent + reclen;
1030 buf->current_dir = dirent;
1031 buf->count -= reclen;
1032 return 0;
1033efault:
1034 buf->error = -EFAULT;
1035 return -EFAULT;
1036}
1037
1038asmlinkage long compat_sys_getdents64(unsigned int fd,
1039 struct linux_dirent64 __user * dirent, unsigned int count)
1040{
1041 struct file * file;
1042 struct linux_dirent64 __user * lastdirent;
1043 struct compat_getdents_callback64 buf;
1044 int error;
1045
1046 error = -EFAULT;
1047 if (!access_ok(VERIFY_WRITE, dirent, count))
1048 goto out;
1049
1050 error = -EBADF;
1051 file = fget(fd);
1052 if (!file)
1053 goto out;
1054
1055 buf.current_dir = dirent;
1056 buf.previous = NULL;
1057 buf.count = count;
1058 buf.error = 0;
1059
1060 error = vfs_readdir(file, compat_filldir64, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -04001061 if (error >= 0)
1062 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 lastdirent = buf.previous;
1064 if (lastdirent) {
1065 typeof(lastdirent->d_off) d_off = file->f_pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001066 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001067 error = -EFAULT;
1068 else
1069 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 fput(file);
1072out:
1073 return error;
1074}
1075#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1076
1077static ssize_t compat_do_readv_writev(int type, struct file *file,
1078 const struct compat_iovec __user *uvector,
1079 unsigned long nr_segs, loff_t *pos)
1080{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 compat_ssize_t tot_len;
1082 struct iovec iovstack[UIO_FASTIOV];
Dan Rosenberg767b68e2010-09-22 14:32:56 -04001083 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 io_fn_t fn;
1086 iov_fn_t fnv;
1087
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (!file->f_op)
1090 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -07001091
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 ret = -EFAULT;
1093 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1094 goto out;
1095
Jeff Moyerb8373362010-05-26 14:44:25 -07001096 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
Christopher Yeohfcf63402011-10-31 17:06:39 -07001097 UIO_FASTIOV, iovstack, &iov, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 if (tot_len == 0) {
1099 ret = 0;
1100 goto out;
1101 }
1102
1103 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001104 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 goto out;
1106
1107 fnv = NULL;
1108 if (type == READ) {
1109 fn = file->f_op->read;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001110 fnv = file->f_op->aio_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 } else {
1112 fn = (io_fn_t)file->f_op->write;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001113 fnv = file->f_op->aio_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 }
1115
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001116 if (fnv)
1117 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1118 pos, fnv);
1119 else
1120 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122out:
1123 if (iov != iovstack)
1124 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -04001125 if ((ret + (type == READ)) > 0) {
Robert Love0eeca282005-07-12 17:06:03 -04001126 if (type == READ)
Eric Paris2a12a9d2009-12-17 21:24:21 -05001127 fsnotify_access(file);
Robert Love0eeca282005-07-12 17:06:03 -04001128 else
Eric Paris2a12a9d2009-12-17 21:24:21 -05001129 fsnotify_modify(file);
Robert Love0eeca282005-07-12 17:06:03 -04001130 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 return ret;
1132}
1133
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001134static size_t compat_readv(struct file *file,
1135 const struct compat_iovec __user *vec,
1136 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 ssize_t ret = -EBADF;
1139
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 if (!(file->f_mode & FMODE_READ))
1141 goto out;
1142
1143 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001144 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 goto out;
1146
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001147 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001150 if (ret > 0)
1151 add_rchar(current, ret);
1152 inc_syscr(current);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001153 return ret;
1154}
1155
1156asmlinkage ssize_t
1157compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1158 unsigned long vlen)
1159{
1160 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001161 int fput_needed;
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001162 ssize_t ret;
1163
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001164 file = fget_light(fd, &fput_needed);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001165 if (!file)
1166 return -EBADF;
1167 ret = compat_readv(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001168 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 return ret;
1170}
1171
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001172asmlinkage ssize_t
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001173compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
1174 unsigned long vlen, loff_t pos)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001175{
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001176 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001177 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001178 ssize_t ret;
1179
1180 if (pos < 0)
1181 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001182 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001183 if (!file)
1184 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001185 ret = -ESPIPE;
1186 if (file->f_mode & FMODE_PREAD)
1187 ret = compat_readv(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001188 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001189 return ret;
1190}
1191
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001192asmlinkage ssize_t
1193compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1194 unsigned long vlen, u32 pos_low, u32 pos_high)
1195{
1196 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1197 return compat_sys_preadv64(fd, vec, vlen, pos);
1198}
1199
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001200static size_t compat_writev(struct file *file,
1201 const struct compat_iovec __user *vec,
1202 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 ssize_t ret = -EBADF;
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 if (!(file->f_mode & FMODE_WRITE))
1207 goto out;
1208
1209 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001210 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 goto out;
1212
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001213 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
1215out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001216 if (ret > 0)
1217 add_wchar(current, ret);
1218 inc_syscw(current);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001219 return ret;
1220}
1221
1222asmlinkage ssize_t
1223compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1224 unsigned long vlen)
1225{
1226 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001227 int fput_needed;
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001228 ssize_t ret;
1229
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001230 file = fget_light(fd, &fput_needed);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001231 if (!file)
1232 return -EBADF;
1233 ret = compat_writev(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001234 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return ret;
1236}
1237
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001238asmlinkage ssize_t
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001239compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
1240 unsigned long vlen, loff_t pos)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001241{
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001242 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001243 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001244 ssize_t ret;
1245
1246 if (pos < 0)
1247 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001248 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001249 if (!file)
1250 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001251 ret = -ESPIPE;
1252 if (file->f_mode & FMODE_PWRITE)
1253 ret = compat_writev(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001254 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001255 return ret;
1256}
1257
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001258asmlinkage ssize_t
1259compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1260 unsigned long vlen, u32 pos_low, u32 pos_high)
1261{
1262 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1263 return compat_sys_pwritev64(fd, vec, vlen, pos);
1264}
1265
Andi Kleend2610202006-05-01 12:15:48 -07001266asmlinkage long
1267compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1268 unsigned int nr_segs, unsigned int flags)
1269{
1270 unsigned i;
Al Viro90cbad62006-10-10 22:44:17 +01001271 struct iovec __user *iov;
Jens Axboe98232d52006-05-04 09:13:49 +02001272 if (nr_segs > UIO_MAXIOV)
Andi Kleend2610202006-05-01 12:15:48 -07001273 return -EINVAL;
1274 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1275 for (i = 0; i < nr_segs; i++) {
1276 struct compat_iovec v;
1277 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1278 get_user(v.iov_len, &iov32[i].iov_len) ||
1279 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1280 put_user(v.iov_len, &iov[i].iov_len))
1281 return -EFAULT;
1282 }
1283 return sys_vmsplice(fd, iov, nr_segs, flags);
1284}
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001287 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1288 * O_LARGEFILE flag.
1289 */
1290asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001291compat_sys_open(const char __user *filename, int flags, umode_t mode)
Miklos Szeredie922efc2005-09-06 15:18:25 -07001292{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001293 return do_sys_open(AT_FDCWD, filename, flags, mode);
1294}
1295
1296/*
1297 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1298 * O_LARGEFILE flag.
1299 */
1300asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001301compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001302{
1303 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001304}
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1307
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001308static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1309 int timeval, int ret)
1310{
1311 struct timespec ts;
1312
1313 if (!p)
1314 return ret;
1315
1316 if (current->personality & STICKY_TIMEOUTS)
1317 goto sticky;
1318
1319 /* No update for zero timeout */
1320 if (!end_time->tv_sec && !end_time->tv_nsec)
1321 return ret;
1322
1323 ktime_get_ts(&ts);
1324 ts = timespec_sub(*end_time, ts);
1325 if (ts.tv_sec < 0)
1326 ts.tv_sec = ts.tv_nsec = 0;
1327
1328 if (timeval) {
1329 struct compat_timeval rtv;
1330
1331 rtv.tv_sec = ts.tv_sec;
1332 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1333
1334 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1335 return ret;
1336 } else {
1337 struct compat_timespec rts;
1338
1339 rts.tv_sec = ts.tv_sec;
1340 rts.tv_nsec = ts.tv_nsec;
1341
1342 if (!copy_to_user(p, &rts, sizeof(rts)))
1343 return ret;
1344 }
1345 /*
1346 * If an application puts its timeval in read-only memory, we
1347 * don't want the Linux-specific update to the timeval to
1348 * cause a fault after the select has completed
1349 * successfully. However, because we're not updating the
1350 * timeval, we can't restart the system call.
1351 */
1352
1353sticky:
1354 if (ret == -ERESTARTNOHAND)
1355 ret = -EINTR;
1356 return ret;
1357}
1358
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359/*
1360 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1361 * 64-bit unsigned longs.
1362 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001363static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1365 unsigned long *fdset)
1366{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001367 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 if (ufdset) {
1369 unsigned long odd;
1370
1371 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1372 return -EFAULT;
1373
1374 odd = nr & 1UL;
1375 nr &= ~1UL;
1376 while (nr) {
1377 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001378 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1379 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 ufdset += 2;
1381 *fdset++ = h << 32 | l;
1382 nr -= 2;
1383 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001384 if (odd && __get_user(*fdset, ufdset))
1385 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 } else {
1387 /* Tricky, must clear full unsigned long in the
1388 * kernel fdset at the end, this makes sure that
1389 * actually happens.
1390 */
1391 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1392 }
1393 return 0;
1394}
1395
Arjan van de Ven858119e2006-01-14 13:20:43 -08001396static
Heiko Carstens7116e992006-12-06 20:36:36 -08001397int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1398 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399{
1400 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001401 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
1403 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001404 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
1406 odd = nr & 1UL;
1407 nr &= ~1UL;
1408 while (nr) {
1409 unsigned long h, l;
1410 l = *fdset++;
1411 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001412 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1413 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 ufdset += 2;
1415 nr -= 2;
1416 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001417 if (odd && __put_user(*fdset, ufdset))
1418 return -EFAULT;
1419 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420}
1421
1422
1423/*
1424 * This is a virtual copy of sys_select from fs/select.c and probably
1425 * should be compared to it from time to time
1426 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
1428/*
1429 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1430 * like to be certain this leads to no problems. So I return
1431 * EINTR just for safety.
1432 *
1433 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1434 * I'm trying ERESTARTNOHAND which restart only when you want to.
1435 */
David Woodhouse9f729492006-01-18 17:44:05 -08001436int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001437 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1438 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439{
1440 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001441 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001442 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001443 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001444 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 if (n < 0)
1447 goto out_nofds;
1448
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001449 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001450 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001451 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001452 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001453 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001454 if (n > max_fds)
1455 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
1457 /*
1458 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1459 * since we used fdset we need to allocate memory in units of
1460 * long-words.
1461 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001463 bits = stack_fds;
1464 if (size > sizeof(stack_fds) / 6) {
1465 bits = kmalloc(6 * size, GFP_KERNEL);
1466 ret = -ENOMEM;
1467 if (!bits)
1468 goto out_nofds;
1469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 fds.in = (unsigned long *) bits;
1471 fds.out = (unsigned long *) (bits + size);
1472 fds.ex = (unsigned long *) (bits + 2*size);
1473 fds.res_in = (unsigned long *) (bits + 3*size);
1474 fds.res_out = (unsigned long *) (bits + 4*size);
1475 fds.res_ex = (unsigned long *) (bits + 5*size);
1476
1477 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1478 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1479 (ret = compat_get_fd_set(n, exp, fds.ex)))
1480 goto out;
1481 zero_fd_set(n, fds.res_in);
1482 zero_fd_set(n, fds.res_out);
1483 zero_fd_set(n, fds.res_ex);
1484
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001485 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
1487 if (ret < 0)
1488 goto out;
1489 if (!ret) {
1490 ret = -ERESTARTNOHAND;
1491 if (signal_pending(current))
1492 goto out;
1493 ret = 0;
1494 }
1495
Heiko Carstens7116e992006-12-06 20:36:36 -08001496 if (compat_set_fd_set(n, inp, fds.res_in) ||
1497 compat_set_fd_set(n, outp, fds.res_out) ||
1498 compat_set_fd_set(n, exp, fds.res_ex))
1499 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001501 if (bits != stack_fds)
1502 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503out_nofds:
1504 return ret;
1505}
1506
David Woodhouse9f729492006-01-18 17:44:05 -08001507asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1508 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1509 struct compat_timeval __user *tvp)
1510{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001511 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001512 struct compat_timeval tv;
1513 int ret;
1514
1515 if (tvp) {
1516 if (copy_from_user(&tv, tvp, sizeof(tv)))
1517 return -EFAULT;
1518
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001519 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001520 if (poll_select_set_timeout(to,
1521 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1522 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001523 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001524 }
1525
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001526 ret = compat_core_sys_select(n, inp, outp, exp, to);
1527 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001528
1529 return ret;
1530}
1531
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001532struct compat_sel_arg_struct {
1533 compat_ulong_t n;
1534 compat_uptr_t inp;
1535 compat_uptr_t outp;
1536 compat_uptr_t exp;
1537 compat_uptr_t tvp;
1538};
1539
1540asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1541{
1542 struct compat_sel_arg_struct a;
1543
1544 if (copy_from_user(&a, arg, sizeof(a)))
1545 return -EFAULT;
1546 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1547 compat_ptr(a.exp), compat_ptr(a.tvp));
1548}
1549
Roland McGrathf3de2722008-04-30 00:53:09 -07001550#ifdef HAVE_SET_RESTORE_SIGMASK
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001551static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001552 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1553 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1554 compat_size_t sigsetsize)
1555{
1556 compat_sigset_t ss32;
1557 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001558 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001559 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001560 int ret;
1561
1562 if (tsp) {
1563 if (copy_from_user(&ts, tsp, sizeof(ts)))
1564 return -EFAULT;
1565
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001566 to = &end_time;
1567 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001568 return -EINVAL;
1569 }
1570
1571 if (sigmask) {
1572 if (sigsetsize != sizeof(compat_sigset_t))
1573 return -EINVAL;
1574 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1575 return -EFAULT;
1576 sigset_from_compat(&ksigmask, &ss32);
1577
1578 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1579 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1580 }
1581
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001582 ret = compat_core_sys_select(n, inp, outp, exp, to);
1583 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001584
1585 if (ret == -ERESTARTNOHAND) {
1586 /*
1587 * Don't restore the signal mask yet. Let do_signal() deliver
1588 * the signal on the way back to userspace, before the signal
1589 * mask is restored.
1590 */
1591 if (sigmask) {
1592 memcpy(&current->saved_sigmask, &sigsaved,
1593 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001594 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001595 }
1596 } else if (sigmask)
1597 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1598
1599 return ret;
1600}
1601
1602asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1603 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1604 struct compat_timespec __user *tsp, void __user *sig)
1605{
1606 compat_size_t sigsetsize = 0;
1607 compat_uptr_t up = 0;
1608
1609 if (sig) {
1610 if (!access_ok(VERIFY_READ, sig,
1611 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1612 __get_user(up, (compat_uptr_t __user *)sig) ||
1613 __get_user(sigsetsize,
1614 (compat_size_t __user *)(sig+sizeof(up))))
1615 return -EFAULT;
1616 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001617 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1618 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001619}
1620
1621asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1622 unsigned int nfds, struct compat_timespec __user *tsp,
1623 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1624{
1625 compat_sigset_t ss32;
1626 sigset_t ksigmask, sigsaved;
1627 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001628 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001629 int ret;
1630
1631 if (tsp) {
1632 if (copy_from_user(&ts, tsp, sizeof(ts)))
1633 return -EFAULT;
1634
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001635 to = &end_time;
1636 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1637 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001638 }
1639
1640 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001641 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001642 return -EINVAL;
1643 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1644 return -EFAULT;
1645 sigset_from_compat(&ksigmask, &ss32);
1646
1647 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1648 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1649 }
1650
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001651 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001652
1653 /* We can restart this syscall, usually */
1654 if (ret == -EINTR) {
1655 /*
1656 * Don't restore the signal mask yet. Let do_signal() deliver
1657 * the signal on the way back to userspace, before the signal
1658 * mask is restored.
1659 */
1660 if (sigmask) {
1661 memcpy(&current->saved_sigmask, &sigsaved,
1662 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001663 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001664 }
1665 ret = -ERESTARTNOHAND;
1666 } else if (sigmask)
1667 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1668
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001669 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001670
1671 return ret;
1672}
Roland McGrathf3de2722008-04-30 00:53:09 -07001673#endif /* HAVE_SET_RESTORE_SIGMASK */
David Woodhouse9f729492006-01-18 17:44:05 -08001674
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001675#ifdef CONFIG_EPOLL
1676
Roland McGrathf3de2722008-04-30 00:53:09 -07001677#ifdef HAVE_SET_RESTORE_SIGMASK
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001678asmlinkage long compat_sys_epoll_pwait(int epfd,
1679 struct compat_epoll_event __user *events,
1680 int maxevents, int timeout,
1681 const compat_sigset_t __user *sigmask,
1682 compat_size_t sigsetsize)
1683{
1684 long err;
1685 compat_sigset_t csigmask;
1686 sigset_t ksigmask, sigsaved;
1687
1688 /*
1689 * If the caller wants a certain signal mask to be set during the wait,
1690 * we apply it here.
1691 */
1692 if (sigmask) {
1693 if (sigsetsize != sizeof(compat_sigset_t))
1694 return -EINVAL;
1695 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1696 return -EFAULT;
1697 sigset_from_compat(&ksigmask, &csigmask);
1698 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1699 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1700 }
1701
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001702 err = sys_epoll_wait(epfd, events, maxevents, timeout);
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001703
1704 /*
1705 * If we changed the signal mask, we need to restore the original one.
1706 * In case we've got a signal while waiting, we do not restore the
1707 * signal mask yet, and we allow do_signal() to deliver the signal on
1708 * the way back to userspace, before the signal mask is restored.
1709 */
1710 if (sigmask) {
1711 if (err == -EINTR) {
1712 memcpy(&current->saved_sigmask, &sigsaved,
1713 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001714 set_restore_sigmask();
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001715 } else
1716 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1717 }
1718
1719 return err;
1720}
Roland McGrathf3de2722008-04-30 00:53:09 -07001721#endif /* HAVE_SET_RESTORE_SIGMASK */
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001722
1723#endif /* CONFIG_EPOLL */
Davide Libenzi6d18c922007-05-10 22:23:15 -07001724
1725#ifdef CONFIG_SIGNALFD
1726
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001727asmlinkage long compat_sys_signalfd4(int ufd,
1728 const compat_sigset_t __user *sigmask,
1729 compat_size_t sigsetsize, int flags)
Davide Libenzi6d18c922007-05-10 22:23:15 -07001730{
1731 compat_sigset_t ss32;
1732 sigset_t tmp;
1733 sigset_t __user *ksigmask;
1734
1735 if (sigsetsize != sizeof(compat_sigset_t))
1736 return -EINVAL;
1737 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1738 return -EFAULT;
1739 sigset_from_compat(&tmp, &ss32);
1740 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1741 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1742 return -EFAULT;
1743
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001744 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
Davide Libenzi6d18c922007-05-10 22:23:15 -07001745}
1746
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001747asmlinkage long compat_sys_signalfd(int ufd,
1748 const compat_sigset_t __user *sigmask,
1749 compat_size_t sigsetsize)
1750{
1751 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1752}
Davide Libenzi6d18c922007-05-10 22:23:15 -07001753#endif /* CONFIG_SIGNALFD */
1754
Davide Libenzi83f5d122007-05-10 22:23:18 -07001755#ifdef CONFIG_TIMERFD
1756
Davide Libenzi4d672e72008-02-04 22:27:26 -08001757asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1758 const struct compat_itimerspec __user *utmr,
1759 struct compat_itimerspec __user *otmr)
Davide Libenzi83f5d122007-05-10 22:23:18 -07001760{
Davide Libenzi4d672e72008-02-04 22:27:26 -08001761 int error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001762 struct itimerspec t;
1763 struct itimerspec __user *ut;
1764
Davide Libenzi83f5d122007-05-10 22:23:18 -07001765 if (get_compat_itimerspec(&t, utmr))
Heiko Carstens8317f142007-05-16 22:11:08 -07001766 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001767 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1768 if (copy_to_user(&ut[0], &t, sizeof(t)))
Heiko Carstens8317f142007-05-16 22:11:08 -07001769 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001770 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1771 if (!error && otmr)
1772 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1773 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001774
Davide Libenzi4d672e72008-02-04 22:27:26 -08001775 return error;
1776}
1777
1778asmlinkage long compat_sys_timerfd_gettime(int ufd,
1779 struct compat_itimerspec __user *otmr)
1780{
1781 int error;
1782 struct itimerspec t;
1783 struct itimerspec __user *ut;
1784
1785 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1786 error = sys_timerfd_gettime(ufd, ut);
1787 if (!error)
1788 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1789 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1790
1791 return error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001792}
1793
1794#endif /* CONFIG_TIMERFD */
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301795
1796#ifdef CONFIG_FHANDLE
1797/*
1798 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1799 * doesn't set the O_LARGEFILE flag.
1800 */
1801asmlinkage long
1802compat_sys_open_by_handle_at(int mountdirfd,
1803 struct file_handle __user *handle, int flags)
1804{
1805 return do_handle_open(mountdirfd, handle, flags);
1806}
1807#endif