blob: b7a24d0ca30df9d82beee3866b0dc30861946c0f [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>
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;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800147 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
148 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Al Virofcf83062012-02-12 20:56:29 -0500149 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 Yeohac34ebb2012-05-31 16:26:42 -0700535 struct iovec **ret_pointer)
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 Kim6a5640f12010-12-27 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 Yeohac34ebb2012-05-31 16:26:42 -0700582 if (type >= 0 &&
Christopher Yeohfcf63402011-10-31 17:06:39 -0700583 !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;
Al Viro2903ff02012-08-28 12:52:22 -0400873 struct fd f = fdget(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 struct compat_readdir_callback buf;
875
Al Viro2903ff02012-08-28 12:52:22 -0400876 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -0400877 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
879 buf.result = 0;
880 buf.dirent = dirent;
881
Al Viro2903ff02012-08-28 12:52:22 -0400882 error = vfs_readdir(f.file, compat_fillonedir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400883 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 error = buf.result;
885
Al Viro2903ff02012-08-28 12:52:22 -0400886 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 return error;
888}
889
890struct compat_linux_dirent {
891 compat_ulong_t d_ino;
892 compat_ulong_t d_off;
893 unsigned short d_reclen;
894 char d_name[1];
895};
896
897struct compat_getdents_callback {
898 struct compat_linux_dirent __user *current_dir;
899 struct compat_linux_dirent __user *previous;
900 int count;
901 int error;
902};
903
904static int compat_filldir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700905 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
907 struct compat_linux_dirent __user * dirent;
908 struct compat_getdents_callback *buf = __buf;
David Howellsafefdbb2006-10-03 01:13:46 -0700909 compat_ulong_t d_ino;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700910 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
911 namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
913 buf->error = -EINVAL; /* only used if we fail.. */
914 if (reclen > buf->count)
915 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700916 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400917 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
918 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700919 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 dirent = buf->previous;
922 if (dirent) {
923 if (__put_user(offset, &dirent->d_off))
924 goto efault;
925 }
926 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700927 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 goto efault;
929 if (__put_user(reclen, &dirent->d_reclen))
930 goto efault;
931 if (copy_to_user(dirent->d_name, name, namlen))
932 goto efault;
933 if (__put_user(0, dirent->d_name + namlen))
934 goto efault;
935 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
936 goto efault;
937 buf->previous = dirent;
938 dirent = (void __user *)dirent + reclen;
939 buf->current_dir = dirent;
940 buf->count -= reclen;
941 return 0;
942efault:
943 buf->error = -EFAULT;
944 return -EFAULT;
945}
946
947asmlinkage long compat_sys_getdents(unsigned int fd,
948 struct compat_linux_dirent __user *dirent, unsigned int count)
949{
Al Viro2903ff02012-08-28 12:52:22 -0400950 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 struct compat_linux_dirent __user * lastdirent;
952 struct compat_getdents_callback buf;
953 int error;
954
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 if (!access_ok(VERIFY_WRITE, dirent, count))
Al Viro863ced72012-04-21 18:40:32 -0400956 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Al Viro2903ff02012-08-28 12:52:22 -0400958 f = fdget(fd);
959 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -0400960 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
962 buf.current_dir = dirent;
963 buf.previous = NULL;
964 buf.count = count;
965 buf.error = 0;
966
Al Viro2903ff02012-08-28 12:52:22 -0400967 error = vfs_readdir(f.file, compat_filldir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400968 if (error >= 0)
969 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 lastdirent = buf.previous;
971 if (lastdirent) {
Al Viro2903ff02012-08-28 12:52:22 -0400972 if (put_user(f.file->f_pos, &lastdirent->d_off))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 error = -EFAULT;
974 else
975 error = count - buf.count;
976 }
Al Viro2903ff02012-08-28 12:52:22 -0400977 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 return error;
979}
980
981#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
983struct compat_getdents_callback64 {
984 struct linux_dirent64 __user *current_dir;
985 struct linux_dirent64 __user *previous;
986 int count;
987 int error;
988};
989
990static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
David Howellsafefdbb2006-10-03 01:13:46 -0700991 u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
993 struct linux_dirent64 __user *dirent;
994 struct compat_getdents_callback64 *buf = __buf;
Kevin Winchester85c9fe82010-08-09 17:20:22 -0700995 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
996 sizeof(u64));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 u64 off;
998
999 buf->error = -EINVAL; /* only used if we fail.. */
1000 if (reclen > buf->count)
1001 return -EINVAL;
1002 dirent = buf->previous;
1003
1004 if (dirent) {
1005 if (__put_user_unaligned(offset, &dirent->d_off))
1006 goto efault;
1007 }
1008 dirent = buf->current_dir;
1009 if (__put_user_unaligned(ino, &dirent->d_ino))
1010 goto efault;
1011 off = 0;
1012 if (__put_user_unaligned(off, &dirent->d_off))
1013 goto efault;
1014 if (__put_user(reclen, &dirent->d_reclen))
1015 goto efault;
1016 if (__put_user(d_type, &dirent->d_type))
1017 goto efault;
1018 if (copy_to_user(dirent->d_name, name, namlen))
1019 goto efault;
1020 if (__put_user(0, dirent->d_name + namlen))
1021 goto efault;
1022 buf->previous = dirent;
1023 dirent = (void __user *)dirent + reclen;
1024 buf->current_dir = dirent;
1025 buf->count -= reclen;
1026 return 0;
1027efault:
1028 buf->error = -EFAULT;
1029 return -EFAULT;
1030}
1031
1032asmlinkage long compat_sys_getdents64(unsigned int fd,
1033 struct linux_dirent64 __user * dirent, unsigned int count)
1034{
Al Viro2903ff02012-08-28 12:52:22 -04001035 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 struct linux_dirent64 __user * lastdirent;
1037 struct compat_getdents_callback64 buf;
1038 int error;
1039
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 if (!access_ok(VERIFY_WRITE, dirent, count))
Al Viro863ced72012-04-21 18:40:32 -04001041 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
Al Viro2903ff02012-08-28 12:52:22 -04001043 f = fdget(fd);
1044 if (!f.file)
Al Viro863ced72012-04-21 18:40:32 -04001045 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047 buf.current_dir = dirent;
1048 buf.previous = NULL;
1049 buf.count = count;
1050 buf.error = 0;
1051
Al Viro2903ff02012-08-28 12:52:22 -04001052 error = vfs_readdir(f.file, compat_filldir64, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -04001053 if (error >= 0)
1054 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 lastdirent = buf.previous;
1056 if (lastdirent) {
Al Viro2903ff02012-08-28 12:52:22 -04001057 typeof(lastdirent->d_off) d_off = f.file->f_pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001058 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001059 error = -EFAULT;
1060 else
1061 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 }
Al Viro2903ff02012-08-28 12:52:22 -04001063 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 return error;
1065}
1066#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1067
1068static ssize_t compat_do_readv_writev(int type, struct file *file,
1069 const struct compat_iovec __user *uvector,
1070 unsigned long nr_segs, loff_t *pos)
1071{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 compat_ssize_t tot_len;
1073 struct iovec iovstack[UIO_FASTIOV];
Dan Rosenberg767b68e2010-09-22 14:32:56 -04001074 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 io_fn_t fn;
1077 iov_fn_t fnv;
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 if (!file->f_op)
1081 goto out;
Jeff Moyerb8373362010-05-26 14:44:25 -07001082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 ret = -EFAULT;
1084 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1085 goto out;
1086
Jeff Moyerb8373362010-05-26 14:44:25 -07001087 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
Christopher Yeohac34ebb2012-05-31 16:26:42 -07001088 UIO_FASTIOV, iovstack, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (tot_len == 0) {
1090 ret = 0;
1091 goto out;
1092 }
1093
1094 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001095 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 goto out;
1097
1098 fnv = NULL;
1099 if (type == READ) {
1100 fn = file->f_op->read;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001101 fnv = file->f_op->aio_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 } else {
1103 fn = (io_fn_t)file->f_op->write;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001104 fnv = file->f_op->aio_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 }
1106
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001107 if (fnv)
1108 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1109 pos, fnv);
1110 else
1111 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113out:
1114 if (iov != iovstack)
1115 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -04001116 if ((ret + (type == READ)) > 0) {
Robert Love0eeca282005-07-12 17:06:03 -04001117 if (type == READ)
Eric Paris2a12a9d2009-12-17 21:24:21 -05001118 fsnotify_access(file);
Robert Love0eeca282005-07-12 17:06:03 -04001119 else
Eric Paris2a12a9d2009-12-17 21:24:21 -05001120 fsnotify_modify(file);
Robert Love0eeca282005-07-12 17:06:03 -04001121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 return ret;
1123}
1124
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001125static size_t compat_readv(struct file *file,
1126 const struct compat_iovec __user *vec,
1127 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 ssize_t ret = -EBADF;
1130
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 if (!(file->f_mode & FMODE_READ))
1132 goto out;
1133
1134 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001135 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 goto out;
1137
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001138 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
1140out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001141 if (ret > 0)
1142 add_rchar(current, ret);
1143 inc_syscr(current);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001144 return ret;
1145}
1146
1147asmlinkage ssize_t
1148compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1149 unsigned long vlen)
1150{
Al Viro2903ff02012-08-28 12:52:22 -04001151 struct fd f = fdget(fd);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001152 ssize_t ret;
Al Viro0e665d52012-08-20 15:28:00 +01001153 loff_t pos;
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001154
Al Viro2903ff02012-08-28 12:52:22 -04001155 if (!f.file)
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001156 return -EBADF;
Al Viro2903ff02012-08-28 12:52:22 -04001157 pos = f.file->f_pos;
1158 ret = compat_readv(f.file, vec, vlen, &pos);
1159 f.file->f_pos = pos;
1160 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 return ret;
1162}
1163
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001164asmlinkage ssize_t
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001165compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
1166 unsigned long vlen, loff_t pos)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001167{
Al Viro2903ff02012-08-28 12:52:22 -04001168 struct fd f;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001169 ssize_t ret;
1170
1171 if (pos < 0)
1172 return -EINVAL;
Al Viro2903ff02012-08-28 12:52:22 -04001173 f = fdget(fd);
1174 if (!f.file)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001175 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001176 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -04001177 if (f.file->f_mode & FMODE_PREAD)
1178 ret = compat_readv(f.file, vec, vlen, &pos);
1179 fdput(f);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001180 return ret;
1181}
1182
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001183asmlinkage ssize_t
1184compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1185 unsigned long vlen, u32 pos_low, u32 pos_high)
1186{
1187 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1188 return compat_sys_preadv64(fd, vec, vlen, pos);
1189}
1190
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001191static size_t compat_writev(struct file *file,
1192 const struct compat_iovec __user *vec,
1193 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 ssize_t ret = -EBADF;
1196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 if (!(file->f_mode & FMODE_WRITE))
1198 goto out;
1199
1200 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001201 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 goto out;
1203
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001204 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001207 if (ret > 0)
1208 add_wchar(current, ret);
1209 inc_syscw(current);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001210 return ret;
1211}
1212
1213asmlinkage ssize_t
1214compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1215 unsigned long vlen)
1216{
Al Viro2903ff02012-08-28 12:52:22 -04001217 struct fd f = fdget(fd);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001218 ssize_t ret;
Al Viro0e665d52012-08-20 15:28:00 +01001219 loff_t pos;
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001220
Al Viro2903ff02012-08-28 12:52:22 -04001221 if (!f.file)
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001222 return -EBADF;
Al Viro2903ff02012-08-28 12:52:22 -04001223 pos = f.file->f_pos;
1224 ret = compat_writev(f.file, vec, vlen, &pos);
1225 f.file->f_pos = pos;
1226 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 return ret;
1228}
1229
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001230asmlinkage ssize_t
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001231compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
1232 unsigned long vlen, loff_t pos)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001233{
Al Viro2903ff02012-08-28 12:52:22 -04001234 struct fd f;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001235 ssize_t ret;
1236
1237 if (pos < 0)
1238 return -EINVAL;
Al Viro2903ff02012-08-28 12:52:22 -04001239 f = fdget(fd);
1240 if (!f.file)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001241 return -EBADF;
Al Viro586ce092011-03-13 01:50:58 -05001242 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -04001243 if (f.file->f_mode & FMODE_PWRITE)
1244 ret = compat_writev(f.file, vec, vlen, &pos);
1245 fdput(f);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001246 return ret;
1247}
1248
H. J. Lu4ee5c0d2012-02-14 13:30:41 -08001249asmlinkage ssize_t
1250compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1251 unsigned long vlen, u32 pos_low, u32 pos_high)
1252{
1253 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1254 return compat_sys_pwritev64(fd, vec, vlen, pos);
1255}
1256
Andi Kleend2610202006-05-01 12:15:48 -07001257asmlinkage long
1258compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1259 unsigned int nr_segs, unsigned int flags)
1260{
1261 unsigned i;
Al Viro90cbad62006-10-10 22:44:17 +01001262 struct iovec __user *iov;
Jens Axboe98232d52006-05-04 09:13:49 +02001263 if (nr_segs > UIO_MAXIOV)
Andi Kleend2610202006-05-01 12:15:48 -07001264 return -EINVAL;
1265 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1266 for (i = 0; i < nr_segs; i++) {
1267 struct compat_iovec v;
1268 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1269 get_user(v.iov_len, &iov32[i].iov_len) ||
1270 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1271 put_user(v.iov_len, &iov[i].iov_len))
1272 return -EFAULT;
1273 }
1274 return sys_vmsplice(fd, iov, nr_segs, flags);
1275}
1276
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001278 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1279 * O_LARGEFILE flag.
1280 */
1281asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001282compat_sys_open(const char __user *filename, int flags, umode_t mode)
Miklos Szeredie922efc2005-09-06 15:18:25 -07001283{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001284 return do_sys_open(AT_FDCWD, filename, flags, mode);
1285}
1286
1287/*
1288 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1289 * O_LARGEFILE flag.
1290 */
1291asmlinkage long
Al Viroa218d0f2011-11-21 14:59:34 -05001292compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, umode_t mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001293{
1294 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001295}
1296
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1298
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001299static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1300 int timeval, int ret)
1301{
1302 struct timespec ts;
1303
1304 if (!p)
1305 return ret;
1306
1307 if (current->personality & STICKY_TIMEOUTS)
1308 goto sticky;
1309
1310 /* No update for zero timeout */
1311 if (!end_time->tv_sec && !end_time->tv_nsec)
1312 return ret;
1313
1314 ktime_get_ts(&ts);
1315 ts = timespec_sub(*end_time, ts);
1316 if (ts.tv_sec < 0)
1317 ts.tv_sec = ts.tv_nsec = 0;
1318
1319 if (timeval) {
1320 struct compat_timeval rtv;
1321
1322 rtv.tv_sec = ts.tv_sec;
1323 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1324
1325 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1326 return ret;
1327 } else {
1328 struct compat_timespec rts;
1329
1330 rts.tv_sec = ts.tv_sec;
1331 rts.tv_nsec = ts.tv_nsec;
1332
1333 if (!copy_to_user(p, &rts, sizeof(rts)))
1334 return ret;
1335 }
1336 /*
1337 * If an application puts its timeval in read-only memory, we
1338 * don't want the Linux-specific update to the timeval to
1339 * cause a fault after the select has completed
1340 * successfully. However, because we're not updating the
1341 * timeval, we can't restart the system call.
1342 */
1343
1344sticky:
1345 if (ret == -ERESTARTNOHAND)
1346 ret = -EINTR;
1347 return ret;
1348}
1349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350/*
1351 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1352 * 64-bit unsigned longs.
1353 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001354static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1356 unsigned long *fdset)
1357{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001358 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 if (ufdset) {
1360 unsigned long odd;
1361
1362 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1363 return -EFAULT;
1364
1365 odd = nr & 1UL;
1366 nr &= ~1UL;
1367 while (nr) {
1368 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001369 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1370 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 ufdset += 2;
1372 *fdset++ = h << 32 | l;
1373 nr -= 2;
1374 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001375 if (odd && __get_user(*fdset, ufdset))
1376 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 } else {
1378 /* Tricky, must clear full unsigned long in the
1379 * kernel fdset at the end, this makes sure that
1380 * actually happens.
1381 */
1382 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1383 }
1384 return 0;
1385}
1386
Arjan van de Ven858119e2006-01-14 13:20:43 -08001387static
Heiko Carstens7116e992006-12-06 20:36:36 -08001388int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1389 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390{
1391 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001392 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
1394 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001395 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397 odd = nr & 1UL;
1398 nr &= ~1UL;
1399 while (nr) {
1400 unsigned long h, l;
1401 l = *fdset++;
1402 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001403 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1404 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 ufdset += 2;
1406 nr -= 2;
1407 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001408 if (odd && __put_user(*fdset, ufdset))
1409 return -EFAULT;
1410 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411}
1412
1413
1414/*
1415 * This is a virtual copy of sys_select from fs/select.c and probably
1416 * should be compared to it from time to time
1417 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419/*
1420 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1421 * like to be certain this leads to no problems. So I return
1422 * EINTR just for safety.
1423 *
1424 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1425 * I'm trying ERESTARTNOHAND which restart only when you want to.
1426 */
David Woodhouse9f729492006-01-18 17:44:05 -08001427int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001428 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1429 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430{
1431 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001432 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001433 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001434 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001435 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 if (n < 0)
1438 goto out_nofds;
1439
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001440 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001441 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001442 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001443 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001444 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001445 if (n > max_fds)
1446 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448 /*
1449 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1450 * since we used fdset we need to allocate memory in units of
1451 * long-words.
1452 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001454 bits = stack_fds;
1455 if (size > sizeof(stack_fds) / 6) {
1456 bits = kmalloc(6 * size, GFP_KERNEL);
1457 ret = -ENOMEM;
1458 if (!bits)
1459 goto out_nofds;
1460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 fds.in = (unsigned long *) bits;
1462 fds.out = (unsigned long *) (bits + size);
1463 fds.ex = (unsigned long *) (bits + 2*size);
1464 fds.res_in = (unsigned long *) (bits + 3*size);
1465 fds.res_out = (unsigned long *) (bits + 4*size);
1466 fds.res_ex = (unsigned long *) (bits + 5*size);
1467
1468 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1469 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1470 (ret = compat_get_fd_set(n, exp, fds.ex)))
1471 goto out;
1472 zero_fd_set(n, fds.res_in);
1473 zero_fd_set(n, fds.res_out);
1474 zero_fd_set(n, fds.res_ex);
1475
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001476 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
1478 if (ret < 0)
1479 goto out;
1480 if (!ret) {
1481 ret = -ERESTARTNOHAND;
1482 if (signal_pending(current))
1483 goto out;
1484 ret = 0;
1485 }
1486
Heiko Carstens7116e992006-12-06 20:36:36 -08001487 if (compat_set_fd_set(n, inp, fds.res_in) ||
1488 compat_set_fd_set(n, outp, fds.res_out) ||
1489 compat_set_fd_set(n, exp, fds.res_ex))
1490 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001492 if (bits != stack_fds)
1493 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494out_nofds:
1495 return ret;
1496}
1497
David Woodhouse9f729492006-01-18 17:44:05 -08001498asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1499 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1500 struct compat_timeval __user *tvp)
1501{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001502 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001503 struct compat_timeval tv;
1504 int ret;
1505
1506 if (tvp) {
1507 if (copy_from_user(&tv, tvp, sizeof(tv)))
1508 return -EFAULT;
1509
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001510 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001511 if (poll_select_set_timeout(to,
1512 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1513 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001514 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001515 }
1516
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001517 ret = compat_core_sys_select(n, inp, outp, exp, to);
1518 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001519
1520 return ret;
1521}
1522
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001523struct compat_sel_arg_struct {
1524 compat_ulong_t n;
1525 compat_uptr_t inp;
1526 compat_uptr_t outp;
1527 compat_uptr_t exp;
1528 compat_uptr_t tvp;
1529};
1530
1531asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1532{
1533 struct compat_sel_arg_struct a;
1534
1535 if (copy_from_user(&a, arg, sizeof(a)))
1536 return -EFAULT;
1537 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1538 compat_ptr(a.exp), compat_ptr(a.tvp));
1539}
1540
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001541static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001542 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1543 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1544 compat_size_t sigsetsize)
1545{
1546 compat_sigset_t ss32;
1547 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001548 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001549 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001550 int ret;
1551
1552 if (tsp) {
1553 if (copy_from_user(&ts, tsp, sizeof(ts)))
1554 return -EFAULT;
1555
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001556 to = &end_time;
1557 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001558 return -EINVAL;
1559 }
1560
1561 if (sigmask) {
1562 if (sigsetsize != sizeof(compat_sigset_t))
1563 return -EINVAL;
1564 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1565 return -EFAULT;
1566 sigset_from_compat(&ksigmask, &ss32);
1567
1568 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1569 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1570 }
1571
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001572 ret = compat_core_sys_select(n, inp, outp, exp, to);
1573 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001574
1575 if (ret == -ERESTARTNOHAND) {
1576 /*
1577 * Don't restore the signal mask yet. Let do_signal() deliver
1578 * the signal on the way back to userspace, before the signal
1579 * mask is restored.
1580 */
1581 if (sigmask) {
1582 memcpy(&current->saved_sigmask, &sigsaved,
1583 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001584 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001585 }
1586 } else if (sigmask)
1587 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1588
1589 return ret;
1590}
1591
1592asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1593 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1594 struct compat_timespec __user *tsp, void __user *sig)
1595{
1596 compat_size_t sigsetsize = 0;
1597 compat_uptr_t up = 0;
1598
1599 if (sig) {
1600 if (!access_ok(VERIFY_READ, sig,
1601 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1602 __get_user(up, (compat_uptr_t __user *)sig) ||
1603 __get_user(sigsetsize,
1604 (compat_size_t __user *)(sig+sizeof(up))))
1605 return -EFAULT;
1606 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001607 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1608 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001609}
1610
1611asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1612 unsigned int nfds, struct compat_timespec __user *tsp,
1613 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1614{
1615 compat_sigset_t ss32;
1616 sigset_t ksigmask, sigsaved;
1617 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001618 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001619 int ret;
1620
1621 if (tsp) {
1622 if (copy_from_user(&ts, tsp, sizeof(ts)))
1623 return -EFAULT;
1624
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001625 to = &end_time;
1626 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1627 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001628 }
1629
1630 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001631 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001632 return -EINVAL;
1633 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1634 return -EFAULT;
1635 sigset_from_compat(&ksigmask, &ss32);
1636
1637 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1638 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1639 }
1640
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001641 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001642
1643 /* We can restart this syscall, usually */
1644 if (ret == -EINTR) {
1645 /*
1646 * Don't restore the signal mask yet. Let do_signal() deliver
1647 * the signal on the way back to userspace, before the signal
1648 * mask is restored.
1649 */
1650 if (sigmask) {
1651 memcpy(&current->saved_sigmask, &sigsaved,
1652 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001653 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001654 }
1655 ret = -ERESTARTNOHAND;
1656 } else if (sigmask)
1657 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1658
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001659 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001660
1661 return ret;
1662}
David Woodhouse9f729492006-01-18 17:44:05 -08001663
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001664#ifdef CONFIG_EPOLL
1665
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001666asmlinkage long compat_sys_epoll_pwait(int epfd,
1667 struct compat_epoll_event __user *events,
1668 int maxevents, int timeout,
1669 const compat_sigset_t __user *sigmask,
1670 compat_size_t sigsetsize)
1671{
1672 long err;
1673 compat_sigset_t csigmask;
1674 sigset_t ksigmask, sigsaved;
1675
1676 /*
1677 * If the caller wants a certain signal mask to be set during the wait,
1678 * we apply it here.
1679 */
1680 if (sigmask) {
1681 if (sigsetsize != sizeof(compat_sigset_t))
1682 return -EINVAL;
1683 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
1684 return -EFAULT;
1685 sigset_from_compat(&ksigmask, &csigmask);
1686 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
1687 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1688 }
1689
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001690 err = sys_epoll_wait(epfd, events, maxevents, timeout);
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001691
1692 /*
1693 * If we changed the signal mask, we need to restore the original one.
1694 * In case we've got a signal while waiting, we do not restore the
1695 * signal mask yet, and we allow do_signal() to deliver the signal on
1696 * the way back to userspace, before the signal mask is restored.
1697 */
1698 if (sigmask) {
1699 if (err == -EINTR) {
1700 memcpy(&current->saved_sigmask, &sigsaved,
1701 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001702 set_restore_sigmask();
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001703 } else
1704 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1705 }
1706
1707 return err;
1708}
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08001709
1710#endif /* CONFIG_EPOLL */
Davide Libenzi6d18c922007-05-10 22:23:15 -07001711
1712#ifdef CONFIG_SIGNALFD
1713
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001714asmlinkage long compat_sys_signalfd4(int ufd,
1715 const compat_sigset_t __user *sigmask,
1716 compat_size_t sigsetsize, int flags)
Davide Libenzi6d18c922007-05-10 22:23:15 -07001717{
1718 compat_sigset_t ss32;
1719 sigset_t tmp;
1720 sigset_t __user *ksigmask;
1721
1722 if (sigsetsize != sizeof(compat_sigset_t))
1723 return -EINVAL;
1724 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1725 return -EFAULT;
1726 sigset_from_compat(&tmp, &ss32);
1727 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
1728 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
1729 return -EFAULT;
1730
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001731 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
Davide Libenzi6d18c922007-05-10 22:23:15 -07001732}
1733
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07001734asmlinkage long compat_sys_signalfd(int ufd,
1735 const compat_sigset_t __user *sigmask,
1736 compat_size_t sigsetsize)
1737{
1738 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
1739}
Davide Libenzi6d18c922007-05-10 22:23:15 -07001740#endif /* CONFIG_SIGNALFD */
1741
Davide Libenzi83f5d122007-05-10 22:23:18 -07001742#ifdef CONFIG_TIMERFD
1743
Davide Libenzi4d672e72008-02-04 22:27:26 -08001744asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
1745 const struct compat_itimerspec __user *utmr,
1746 struct compat_itimerspec __user *otmr)
Davide Libenzi83f5d122007-05-10 22:23:18 -07001747{
Davide Libenzi4d672e72008-02-04 22:27:26 -08001748 int error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001749 struct itimerspec t;
1750 struct itimerspec __user *ut;
1751
Davide Libenzi83f5d122007-05-10 22:23:18 -07001752 if (get_compat_itimerspec(&t, utmr))
Heiko Carstens8317f142007-05-16 22:11:08 -07001753 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001754 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
1755 if (copy_to_user(&ut[0], &t, sizeof(t)))
Heiko Carstens8317f142007-05-16 22:11:08 -07001756 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08001757 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
1758 if (!error && otmr)
1759 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
1760 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001761
Davide Libenzi4d672e72008-02-04 22:27:26 -08001762 return error;
1763}
1764
1765asmlinkage long compat_sys_timerfd_gettime(int ufd,
1766 struct compat_itimerspec __user *otmr)
1767{
1768 int error;
1769 struct itimerspec t;
1770 struct itimerspec __user *ut;
1771
1772 ut = compat_alloc_user_space(sizeof(struct itimerspec));
1773 error = sys_timerfd_gettime(ufd, ut);
1774 if (!error)
1775 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
1776 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
1777
1778 return error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07001779}
1780
1781#endif /* CONFIG_TIMERFD */
Aneesh Kumar K.Vbecfd1f2011-01-29 18:43:26 +05301782
1783#ifdef CONFIG_FHANDLE
1784/*
1785 * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
1786 * doesn't set the O_LARGEFILE flag.
1787 */
1788asmlinkage long
1789compat_sys_open_by_handle_at(int mountdirfd,
1790 struct file_handle __user *handle, int flags)
1791{
1792 return do_handle_open(mountdirfd, handle, flags);
1793}
1794#endif
Catalin Marinas8f9c0112012-09-19 12:01:52 +01001795
1796#ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE
1797asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
1798 compat_off_t __user *offset, compat_size_t count)
1799{
1800 loff_t pos;
1801 off_t off;
1802 ssize_t ret;
1803
1804 if (offset) {
1805 if (unlikely(get_user(off, offset)))
1806 return -EFAULT;
1807 pos = off;
1808 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1809 if (unlikely(put_user(pos, offset)))
1810 return -EFAULT;
1811 return ret;
1812 }
1813
1814 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1815}
1816#endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */