blob: 030602d453b76a0a371880a63990a08cd17fd5b0 [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
11 * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
12 *
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
Milind Arun Choudhary022a1692007-05-08 00:29:02 -070018#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/linkage.h>
20#include <linux/compat.h>
21#include <linux/errno.h>
22#include <linux/time.h>
23#include <linux/fs.h>
24#include <linux/fcntl.h>
25#include <linux/namei.h>
26#include <linux/file.h>
Al Viro9f3acc32008-04-24 07:44:08 -040027#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/vfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/ioctl.h>
30#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/smb.h>
32#include <linux/smb_mount.h>
33#include <linux/ncp_mount.h>
David Howells9a9947b2005-04-18 10:54:51 -070034#include <linux/nfs4_mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/syscalls.h>
36#include <linux/ctype.h>
37#include <linux/module.h>
38#include <linux/dirent.h>
Robert Love0eeca282005-07-12 17:06:03 -040039#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/highuid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/nfsd/syscall.h>
42#include <linux/personality.h>
43#include <linux/rwsem.h>
Jay Lan8f0ab512006-09-30 23:28:59 -070044#include <linux/tsacct_kern.h>
Christoph Hellwig6272e262007-05-08 00:29:21 -070045#include <linux/security.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040046#include <linux/highmem.h>
Davide Libenzi6d18c922007-05-10 22:23:15 -070047#include <linux/signal.h>
Al Virobd01f842006-10-19 17:23:57 -040048#include <linux/poll.h>
David S. Miller4a805e82005-09-14 21:40:00 -070049#include <linux/mm.h>
Davide Libenzif6dfb4f2007-03-07 20:41:21 -080050#include <linux/eventpoll.h>
Al Viro498052b2009-03-30 07:20:30 -040051#include <linux/fs_struct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/uaccess.h>
54#include <asm/mmu_context.h>
55#include <asm/ioctls.h>
David Howells07f3f05c2006-09-30 20:52:18 +020056#include "internal.h"
David Woodhouse9f729492006-01-18 17:44:05 -080057
Andi Kleenbebfa102006-06-26 13:56:52 +020058int compat_log = 1;
59
60int compat_printk(const char *fmt, ...)
61{
62 va_list ap;
63 int ret;
64 if (!compat_log)
65 return 0;
66 va_start(ap, fmt);
67 ret = vprintk(fmt, ap);
68 va_end(ap);
69 return ret;
70}
71
Badari Pulavartyee0b3e62006-09-30 23:28:47 -070072#include "read_write.h"
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/*
75 * Not all architectures have sys_utime, so implement this in terms
76 * of sys_utimes.
77 */
78asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
79{
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
92asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags)
93{
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
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100107asmlinkage long compat_sys_futimesat(unsigned int dfd, 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
126asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
127{
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{
133 compat_ino_t ino = stat->ino;
134 typeof(ubuf->st_uid) uid = 0;
135 typeof(ubuf->st_gid) gid = 0;
136 int err;
137
138 SET_UID(uid, stat->uid);
139 SET_GID(gid, stat->gid);
140
141 if ((u64) stat->size > MAX_NON_LFS ||
142 !old_valid_dev(stat->dev) ||
143 !old_valid_dev(stat->rdev))
144 return -EOVERFLOW;
145 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
146 return -EOVERFLOW;
147
148 if (clear_user(ubuf, sizeof(*ubuf)))
149 return -EFAULT;
150
151 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
152 err |= __put_user(ino, &ubuf->st_ino);
153 err |= __put_user(stat->mode, &ubuf->st_mode);
154 err |= __put_user(stat->nlink, &ubuf->st_nlink);
155 err |= __put_user(uid, &ubuf->st_uid);
156 err |= __put_user(gid, &ubuf->st_gid);
157 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
158 err |= __put_user(stat->size, &ubuf->st_size);
159 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
160 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
161 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
162 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
163 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
164 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
165 err |= __put_user(stat->blksize, &ubuf->st_blksize);
166 err |= __put_user(stat->blocks, &ubuf->st_blocks);
167 return err;
168}
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170asmlinkage long compat_sys_newstat(char __user * filename,
171 struct compat_stat __user *statbuf)
172{
173 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400174 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400176 error = vfs_stat(filename, &stat);
177 if (error)
178 return error;
179 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
182asmlinkage long compat_sys_newlstat(char __user * filename,
183 struct compat_stat __user *statbuf)
184{
185 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400186 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400188 error = vfs_lstat(filename, &stat);
189 if (error)
190 return error;
191 return cp_compat_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Kyle McMartin82d821d2006-03-24 03:18:20 -0800194#ifndef __ARCH_WANT_STAT64
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +1100195asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800196 struct compat_stat __user *statbuf, int flag)
197{
198 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400199 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800200
Oleg Drokin0112fc22009-04-08 20:05:42 +0400201 error = vfs_fstatat(dfd, filename, &stat, flag);
202 if (error)
203 return error;
204 return cp_compat_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800205}
Kyle McMartin82d821d2006-03-24 03:18:20 -0800206#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208asmlinkage long compat_sys_newfstat(unsigned int fd,
209 struct compat_stat __user * statbuf)
210{
211 struct kstat stat;
212 int error = vfs_fstat(fd, &stat);
213
214 if (!error)
215 error = cp_compat_stat(&stat, statbuf);
216 return error;
217}
218
219static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
220{
221
222 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700223 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
224 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return -EOVERFLOW;
226 /* f_files and f_ffree may be -1; it's okay
227 * to stuff that into 32 bits */
228 if (kbuf->f_files != 0xffffffffffffffffULL
229 && (kbuf->f_files & 0xffffffff00000000ULL))
230 return -EOVERFLOW;
231 if (kbuf->f_ffree != 0xffffffffffffffffULL
232 && (kbuf->f_ffree & 0xffffffff00000000ULL))
233 return -EOVERFLOW;
234 }
235 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
236 __put_user(kbuf->f_type, &ubuf->f_type) ||
237 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
238 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
239 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
240 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
241 __put_user(kbuf->f_files, &ubuf->f_files) ||
242 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
243 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
244 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
245 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
246 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
247 __put_user(0, &ubuf->f_spare[0]) ||
248 __put_user(0, &ubuf->f_spare[1]) ||
249 __put_user(0, &ubuf->f_spare[2]) ||
250 __put_user(0, &ubuf->f_spare[3]) ||
251 __put_user(0, &ubuf->f_spare[4]))
252 return -EFAULT;
253 return 0;
254}
255
256/*
257 * The following statfs calls are copies of code from fs/open.c and
258 * should be checked against those from time to time
259 */
Al Viro2d8f3032008-07-22 09:59:21 -0400260asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Al Viro2d8f3032008-07-22 09:59:21 -0400262 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 int error;
264
Al Viro2d8f3032008-07-22 09:59:21 -0400265 error = user_path(pathname, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 if (!error) {
267 struct kstatfs tmp;
Al Viro2d8f3032008-07-22 09:59:21 -0400268 error = vfs_statfs(path.dentry, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800269 if (!error)
270 error = put_compat_statfs(buf, &tmp);
Al Viro2d8f3032008-07-22 09:59:21 -0400271 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 return error;
274}
275
276asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
277{
278 struct file * file;
279 struct kstatfs tmp;
280 int error;
281
282 error = -EBADF;
283 file = fget(fd);
284 if (!file)
285 goto out;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800286 error = vfs_statfs(file->f_path.dentry, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800287 if (!error)
288 error = put_compat_statfs(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 fput(file);
290out:
291 return error;
292}
293
294static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
295{
296 if (sizeof ubuf->f_blocks == 4) {
Jon Tollefsonf4a67cc2008-07-23 21:27:55 -0700297 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
298 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return -EOVERFLOW;
300 /* f_files and f_ffree may be -1; it's okay
301 * to stuff that into 32 bits */
302 if (kbuf->f_files != 0xffffffffffffffffULL
303 && (kbuf->f_files & 0xffffffff00000000ULL))
304 return -EOVERFLOW;
305 if (kbuf->f_ffree != 0xffffffffffffffffULL
306 && (kbuf->f_ffree & 0xffffffff00000000ULL))
307 return -EOVERFLOW;
308 }
309 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
310 __put_user(kbuf->f_type, &ubuf->f_type) ||
311 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
312 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
313 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
314 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
315 __put_user(kbuf->f_files, &ubuf->f_files) ||
316 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
317 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
318 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
319 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
320 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
321 return -EFAULT;
322 return 0;
323}
324
Al Viro2d8f3032008-07-22 09:59:21 -0400325asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
Al Viro2d8f3032008-07-22 09:59:21 -0400327 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 int error;
329
330 if (sz != sizeof(*buf))
331 return -EINVAL;
332
Al Viro2d8f3032008-07-22 09:59:21 -0400333 error = user_path(pathname, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (!error) {
335 struct kstatfs tmp;
Al Viro2d8f3032008-07-22 09:59:21 -0400336 error = vfs_statfs(path.dentry, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800337 if (!error)
338 error = put_compat_statfs64(buf, &tmp);
Al Viro2d8f3032008-07-22 09:59:21 -0400339 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 }
341 return error;
342}
343
344asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
345{
346 struct file * file;
347 struct kstatfs tmp;
348 int error;
349
350 if (sz != sizeof(*buf))
351 return -EINVAL;
352
353 error = -EBADF;
354 file = fget(fd);
355 if (!file)
356 goto out;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800357 error = vfs_statfs(file->f_path.dentry, &tmp);
David Gibson86e07ce2005-11-21 21:32:23 -0800358 if (!error)
359 error = put_compat_statfs64(buf, &tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 fput(file);
361out:
362 return error;
363}
364
Christoph Hellwig2b1c6bd2008-11-28 10:09:09 +0100365/*
366 * This is a copy of sys_ustat, just dealing with a structure layout.
367 * Given how simple this syscall is that apporach is more maintainable
368 * than the various conversion hacks.
369 */
370asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
371{
372 struct super_block *sb;
373 struct compat_ustat tmp;
374 struct kstatfs sbuf;
375 int err;
376
377 sb = user_get_super(new_decode_dev(dev));
378 if (!sb)
379 return -EINVAL;
380 err = vfs_statfs(sb->s_root, &sbuf);
381 drop_super(sb);
382 if (err)
383 return err;
384
385 memset(&tmp, 0, sizeof(struct compat_ustat));
386 tmp.f_tfree = sbuf.f_bfree;
387 tmp.f_tinode = sbuf.f_ffree;
388 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
389 return -EFAULT;
390 return 0;
391}
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
394{
395 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
396 __get_user(kfl->l_type, &ufl->l_type) ||
397 __get_user(kfl->l_whence, &ufl->l_whence) ||
398 __get_user(kfl->l_start, &ufl->l_start) ||
399 __get_user(kfl->l_len, &ufl->l_len) ||
400 __get_user(kfl->l_pid, &ufl->l_pid))
401 return -EFAULT;
402 return 0;
403}
404
405static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
406{
407 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
408 __put_user(kfl->l_type, &ufl->l_type) ||
409 __put_user(kfl->l_whence, &ufl->l_whence) ||
410 __put_user(kfl->l_start, &ufl->l_start) ||
411 __put_user(kfl->l_len, &ufl->l_len) ||
412 __put_user(kfl->l_pid, &ufl->l_pid))
413 return -EFAULT;
414 return 0;
415}
416
417#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
418static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
419{
420 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
421 __get_user(kfl->l_type, &ufl->l_type) ||
422 __get_user(kfl->l_whence, &ufl->l_whence) ||
423 __get_user(kfl->l_start, &ufl->l_start) ||
424 __get_user(kfl->l_len, &ufl->l_len) ||
425 __get_user(kfl->l_pid, &ufl->l_pid))
426 return -EFAULT;
427 return 0;
428}
429#endif
430
431#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
432static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
433{
434 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
435 __put_user(kfl->l_type, &ufl->l_type) ||
436 __put_user(kfl->l_whence, &ufl->l_whence) ||
437 __put_user(kfl->l_start, &ufl->l_start) ||
438 __put_user(kfl->l_len, &ufl->l_len) ||
439 __put_user(kfl->l_pid, &ufl->l_pid))
440 return -EFAULT;
441 return 0;
442}
443#endif
444
445asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
446 unsigned long arg)
447{
448 mm_segment_t old_fs;
449 struct flock f;
450 long ret;
451
452 switch (cmd) {
453 case F_GETLK:
454 case F_SETLK:
455 case F_SETLKW:
456 ret = get_compat_flock(&f, compat_ptr(arg));
457 if (ret != 0)
458 break;
459 old_fs = get_fs();
460 set_fs(KERNEL_DS);
461 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
462 set_fs(old_fs);
463 if (cmd == F_GETLK && ret == 0) {
Nikanth Karthikesanff677f82009-04-01 14:40:51 +0530464 /* GETLK was successful and we need to return the data...
NeilBrown2520f142006-01-08 01:02:40 -0800465 * but it needs to fit in the compat structure.
466 * l_start shouldn't be too big, unless the original
467 * start + end is greater than COMPAT_OFF_T_MAX, in which
468 * case the app was asking for trouble, so we return
469 * -EOVERFLOW in that case.
470 * l_len could be too big, in which case we just truncate it,
471 * and only allow the app to see that part of the conflicting
472 * lock that might make sense to it anyway
473 */
474
475 if (f.l_start > COMPAT_OFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800477 if (f.l_len > COMPAT_OFF_T_MAX)
478 f.l_len = COMPAT_OFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (ret == 0)
480 ret = put_compat_flock(&f, compat_ptr(arg));
481 }
482 break;
483
484 case F_GETLK64:
485 case F_SETLK64:
486 case F_SETLKW64:
487 ret = get_compat_flock64(&f, compat_ptr(arg));
488 if (ret != 0)
489 break;
490 old_fs = get_fs();
491 set_fs(KERNEL_DS);
492 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
493 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
494 (unsigned long)&f);
495 set_fs(old_fs);
496 if (cmd == F_GETLK64 && ret == 0) {
NeilBrown2520f142006-01-08 01:02:40 -0800497 /* need to return lock information - see above for commentary */
498 if (f.l_start > COMPAT_LOFF_T_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 ret = -EOVERFLOW;
NeilBrown2520f142006-01-08 01:02:40 -0800500 if (f.l_len > COMPAT_LOFF_T_MAX)
501 f.l_len = COMPAT_LOFF_T_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (ret == 0)
503 ret = put_compat_flock64(&f, compat_ptr(arg));
504 }
505 break;
506
507 default:
508 ret = sys_fcntl(fd, cmd, arg);
509 break;
510 }
511 return ret;
512}
513
514asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
515 unsigned long arg)
516{
517 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
518 return -EINVAL;
519 return compat_sys_fcntl64(fd, cmd, arg);
520}
521
522asmlinkage long
523compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
524{
525 long ret;
526 aio_context_t ctx64;
527
528 mm_segment_t oldfs = get_fs();
529 if (unlikely(get_user(ctx64, ctx32p)))
530 return -EFAULT;
531
532 set_fs(KERNEL_DS);
533 /* The __user pointer cast is valid because of the set_fs() */
534 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
535 set_fs(oldfs);
536 /* truncating is ok because it's a user address */
537 if (!ret)
538 ret = put_user((u32) ctx64, ctx32p);
539 return ret;
540}
541
542asmlinkage long
543compat_sys_io_getevents(aio_context_t ctx_id,
544 unsigned long min_nr,
545 unsigned long nr,
546 struct io_event __user *events,
547 struct compat_timespec __user *timeout)
548{
549 long ret;
550 struct timespec t;
551 struct timespec __user *ut = NULL;
552
553 ret = -EFAULT;
554 if (unlikely(!access_ok(VERIFY_WRITE, events,
555 nr * sizeof(struct io_event))))
556 goto out;
557 if (timeout) {
558 if (get_compat_timespec(&t, timeout))
559 goto out;
560
561 ut = compat_alloc_user_space(sizeof(*ut));
562 if (copy_to_user(ut, &t, sizeof(t)) )
563 goto out;
564 }
565 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
566out:
567 return ret;
568}
569
570static inline long
571copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
572{
573 compat_uptr_t uptr;
574 int i;
575
576 for (i = 0; i < nr; ++i) {
577 if (get_user(uptr, ptr32 + i))
578 return -EFAULT;
579 if (put_user(compat_ptr(uptr), ptr64 + i))
580 return -EFAULT;
581 }
582 return 0;
583}
584
585#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
586
587asmlinkage long
588compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
589{
590 struct iocb __user * __user *iocb64;
591 long ret;
592
593 if (unlikely(nr < 0))
594 return -EINVAL;
595
596 if (nr > MAX_AIO_SUBMITS)
597 nr = MAX_AIO_SUBMITS;
598
599 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
600 ret = copy_iocb(nr, iocb, iocb64);
601 if (!ret)
602 ret = sys_io_submit(ctx_id, nr, iocb64);
603 return ret;
604}
605
606struct compat_ncp_mount_data {
607 compat_int_t version;
608 compat_uint_t ncp_fd;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700609 __compat_uid_t mounted_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 compat_pid_t wdog_pid;
611 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
612 compat_uint_t time_out;
613 compat_uint_t retry_count;
614 compat_uint_t flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700615 __compat_uid_t uid;
616 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 compat_mode_t file_mode;
618 compat_mode_t dir_mode;
619};
620
621struct compat_ncp_mount_data_v4 {
622 compat_int_t version;
623 compat_ulong_t flags;
624 compat_ulong_t mounted_uid;
625 compat_long_t wdog_pid;
626 compat_uint_t ncp_fd;
627 compat_uint_t time_out;
628 compat_uint_t retry_count;
629 compat_ulong_t uid;
630 compat_ulong_t gid;
631 compat_ulong_t file_mode;
632 compat_ulong_t dir_mode;
633};
634
635static void *do_ncp_super_data_conv(void *raw_data)
636{
637 int version = *(unsigned int *)raw_data;
638
639 if (version == 3) {
640 struct compat_ncp_mount_data *c_n = raw_data;
641 struct ncp_mount_data *n = raw_data;
642
643 n->dir_mode = c_n->dir_mode;
644 n->file_mode = c_n->file_mode;
645 n->gid = c_n->gid;
646 n->uid = c_n->uid;
647 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
648 n->wdog_pid = c_n->wdog_pid;
649 n->mounted_uid = c_n->mounted_uid;
650 } else if (version == 4) {
651 struct compat_ncp_mount_data_v4 *c_n = raw_data;
652 struct ncp_mount_data_v4 *n = raw_data;
653
654 n->dir_mode = c_n->dir_mode;
655 n->file_mode = c_n->file_mode;
656 n->gid = c_n->gid;
657 n->uid = c_n->uid;
658 n->retry_count = c_n->retry_count;
659 n->time_out = c_n->time_out;
660 n->ncp_fd = c_n->ncp_fd;
661 n->wdog_pid = c_n->wdog_pid;
662 n->mounted_uid = c_n->mounted_uid;
663 n->flags = c_n->flags;
664 } else if (version != 5) {
665 return NULL;
666 }
667
668 return raw_data;
669}
670
671struct compat_smb_mount_data {
672 compat_int_t version;
Stephen Rothwell202e5972005-09-06 15:16:40 -0700673 __compat_uid_t mounted_uid;
674 __compat_uid_t uid;
675 __compat_gid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 compat_mode_t file_mode;
677 compat_mode_t dir_mode;
678};
679
680static void *do_smb_super_data_conv(void *raw_data)
681{
682 struct smb_mount_data *s = raw_data;
683 struct compat_smb_mount_data *c_s = raw_data;
684
685 if (c_s->version != SMB_MOUNT_OLDVERSION)
686 goto out;
687 s->dir_mode = c_s->dir_mode;
688 s->file_mode = c_s->file_mode;
689 s->gid = c_s->gid;
690 s->uid = c_s->uid;
691 s->mounted_uid = c_s->mounted_uid;
692 out:
693 return raw_data;
694}
695
David Howells9a9947b2005-04-18 10:54:51 -0700696struct compat_nfs_string {
697 compat_uint_t len;
David Howells5fc3e622005-04-27 15:39:03 -0700698 compat_uptr_t data;
David Howells9a9947b2005-04-18 10:54:51 -0700699};
700
701static inline void compat_nfs_string(struct nfs_string *dst,
702 struct compat_nfs_string *src)
703{
704 dst->data = compat_ptr(src->data);
705 dst->len = src->len;
706}
707
708struct compat_nfs4_mount_data_v1 {
709 compat_int_t version;
710 compat_int_t flags;
711 compat_int_t rsize;
712 compat_int_t wsize;
713 compat_int_t timeo;
714 compat_int_t retrans;
715 compat_int_t acregmin;
716 compat_int_t acregmax;
717 compat_int_t acdirmin;
718 compat_int_t acdirmax;
719 struct compat_nfs_string client_addr;
720 struct compat_nfs_string mnt_path;
721 struct compat_nfs_string hostname;
722 compat_uint_t host_addrlen;
David Howells5fc3e622005-04-27 15:39:03 -0700723 compat_uptr_t host_addr;
David Howells9a9947b2005-04-18 10:54:51 -0700724 compat_int_t proto;
725 compat_int_t auth_flavourlen;
David Howells5fc3e622005-04-27 15:39:03 -0700726 compat_uptr_t auth_flavours;
David Howells9a9947b2005-04-18 10:54:51 -0700727};
728
729static int do_nfs4_super_data_conv(void *raw_data)
730{
731 int version = *(compat_uint_t *) raw_data;
732
733 if (version == 1) {
734 struct compat_nfs4_mount_data_v1 *raw = raw_data;
735 struct nfs4_mount_data *real = raw_data;
736
737 /* copy the fields backwards */
738 real->auth_flavours = compat_ptr(raw->auth_flavours);
739 real->auth_flavourlen = raw->auth_flavourlen;
740 real->proto = raw->proto;
741 real->host_addr = compat_ptr(raw->host_addr);
742 real->host_addrlen = raw->host_addrlen;
743 compat_nfs_string(&real->hostname, &raw->hostname);
744 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
745 compat_nfs_string(&real->client_addr, &raw->client_addr);
746 real->acdirmax = raw->acdirmax;
747 real->acdirmin = raw->acdirmin;
748 real->acregmax = raw->acregmax;
749 real->acregmin = raw->acregmin;
750 real->retrans = raw->retrans;
751 real->timeo = raw->timeo;
752 real->wsize = raw->wsize;
753 real->rsize = raw->rsize;
754 real->flags = raw->flags;
755 real->version = raw->version;
756 }
David Howells9a9947b2005-04-18 10:54:51 -0700757
758 return 0;
759}
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761#define SMBFS_NAME "smbfs"
762#define NCPFS_NAME "ncpfs"
David Howells9a9947b2005-04-18 10:54:51 -0700763#define NFS4_NAME "nfs4"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
766 char __user * type, unsigned long flags,
767 void __user * data)
768{
Vegard Nossumeca6f532009-09-18 13:05:45 -0700769 char *kernel_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 unsigned long data_page;
Vegard Nossumeca6f532009-09-18 13:05:45 -0700771 char *kernel_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 char *dir_page;
773 int retval;
774
Vegard Nossumeca6f532009-09-18 13:05:45 -0700775 retval = copy_mount_string(type, &kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 if (retval < 0)
777 goto out;
778
779 dir_page = getname(dir_name);
780 retval = PTR_ERR(dir_page);
781 if (IS_ERR(dir_page))
782 goto out1;
783
Vegard Nossumeca6f532009-09-18 13:05:45 -0700784 retval = copy_mount_string(dev_name, &kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (retval < 0)
786 goto out2;
787
Vegard Nossumeca6f532009-09-18 13:05:45 -0700788 retval = copy_mount_options(data, &data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (retval < 0)
790 goto out3;
791
792 retval = -EINVAL;
793
Vegard Nossumeca6f532009-09-18 13:05:45 -0700794 if (kernel_type && data_page) {
795 if (!strcmp(kernel_type, SMBFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 do_smb_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700797 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 do_ncp_super_data_conv((void *)data_page);
Vegard Nossumeca6f532009-09-18 13:05:45 -0700799 } else if (!strcmp(kernel_type, NFS4_NAME)) {
David Howells9a9947b2005-04-18 10:54:51 -0700800 if (do_nfs4_super_data_conv((void *) data_page))
801 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 }
803 }
804
Vegard Nossumeca6f532009-09-18 13:05:45 -0700805 retval = do_mount(kernel_dev, dir_page, kernel_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 flags, (void*)data_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
David Howells9a9947b2005-04-18 10:54:51 -0700808 out4:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 free_page(data_page);
810 out3:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700811 kfree(kernel_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 out2:
813 putname(dir_page);
814 out1:
Vegard Nossumeca6f532009-09-18 13:05:45 -0700815 kfree(kernel_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 out:
817 return retval;
818}
819
820#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822struct compat_old_linux_dirent {
823 compat_ulong_t d_ino;
824 compat_ulong_t d_offset;
825 unsigned short d_namlen;
826 char d_name[1];
827};
828
829struct compat_readdir_callback {
830 struct compat_old_linux_dirent __user *dirent;
831 int result;
832};
833
834static int compat_fillonedir(void *__buf, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700835 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
837 struct compat_readdir_callback *buf = __buf;
838 struct compat_old_linux_dirent __user *dirent;
David Howellsafefdbb2006-10-03 01:13:46 -0700839 compat_ulong_t d_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
841 if (buf->result)
842 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700843 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400844 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
845 buf->result = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700846 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400847 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 buf->result++;
849 dirent = buf->dirent;
850 if (!access_ok(VERIFY_WRITE, dirent,
851 (unsigned long)(dirent->d_name + namlen + 1) -
852 (unsigned long)dirent))
853 goto efault;
David Howellsafefdbb2006-10-03 01:13:46 -0700854 if ( __put_user(d_ino, &dirent->d_ino) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 __put_user(offset, &dirent->d_offset) ||
856 __put_user(namlen, &dirent->d_namlen) ||
857 __copy_to_user(dirent->d_name, name, namlen) ||
858 __put_user(0, dirent->d_name + namlen))
859 goto efault;
860 return 0;
861efault:
862 buf->result = -EFAULT;
863 return -EFAULT;
864}
865
866asmlinkage long compat_sys_old_readdir(unsigned int fd,
867 struct compat_old_linux_dirent __user *dirent, unsigned int count)
868{
869 int error;
870 struct file *file;
871 struct compat_readdir_callback buf;
872
873 error = -EBADF;
874 file = fget(fd);
875 if (!file)
876 goto out;
877
878 buf.result = 0;
879 buf.dirent = dirent;
880
881 error = vfs_readdir(file, compat_fillonedir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400882 if (buf.result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 error = buf.result;
884
885 fput(file);
886out:
887 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;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -0700910 int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 buf->error = -EINVAL; /* only used if we fail.. */
913 if (reclen > buf->count)
914 return -EINVAL;
David Howellsafefdbb2006-10-03 01:13:46 -0700915 d_ino = ino;
Al Viro8f3f6552008-08-12 00:28:24 -0400916 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
917 buf->error = -EOVERFLOW;
David Howellsafefdbb2006-10-03 01:13:46 -0700918 return -EOVERFLOW;
Al Viro8f3f6552008-08-12 00:28:24 -0400919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 dirent = buf->previous;
921 if (dirent) {
922 if (__put_user(offset, &dirent->d_off))
923 goto efault;
924 }
925 dirent = buf->current_dir;
David Howellsafefdbb2006-10-03 01:13:46 -0700926 if (__put_user(d_ino, &dirent->d_ino))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 goto efault;
928 if (__put_user(reclen, &dirent->d_reclen))
929 goto efault;
930 if (copy_to_user(dirent->d_name, name, namlen))
931 goto efault;
932 if (__put_user(0, dirent->d_name + namlen))
933 goto efault;
934 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
935 goto efault;
936 buf->previous = dirent;
937 dirent = (void __user *)dirent + reclen;
938 buf->current_dir = dirent;
939 buf->count -= reclen;
940 return 0;
941efault:
942 buf->error = -EFAULT;
943 return -EFAULT;
944}
945
946asmlinkage long compat_sys_getdents(unsigned int fd,
947 struct compat_linux_dirent __user *dirent, unsigned int count)
948{
949 struct file * file;
950 struct compat_linux_dirent __user * lastdirent;
951 struct compat_getdents_callback buf;
952 int error;
953
954 error = -EFAULT;
955 if (!access_ok(VERIFY_WRITE, dirent, count))
956 goto out;
957
958 error = -EBADF;
959 file = fget(fd);
960 if (!file)
961 goto out;
962
963 buf.current_dir = dirent;
964 buf.previous = NULL;
965 buf.count = count;
966 buf.error = 0;
967
968 error = vfs_readdir(file, compat_filldir, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -0400969 if (error >= 0)
970 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 lastdirent = buf.previous;
972 if (lastdirent) {
973 if (put_user(file->f_pos, &lastdirent->d_off))
974 error = -EFAULT;
975 else
976 error = count - buf.count;
977 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 fput(file);
979out:
980 return error;
981}
982
983#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985struct compat_getdents_callback64 {
986 struct linux_dirent64 __user *current_dir;
987 struct linux_dirent64 __user *previous;
988 int count;
989 int error;
990};
991
992static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
David Howellsafefdbb2006-10-03 01:13:46 -0700993 u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
995 struct linux_dirent64 __user *dirent;
996 struct compat_getdents_callback64 *buf = __buf;
997 int jj = NAME_OFFSET(dirent);
Milind Arun Choudhary022a1692007-05-08 00:29:02 -0700998 int reclen = ALIGN(jj + namlen + 1, sizeof(u64));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 u64 off;
1000
1001 buf->error = -EINVAL; /* only used if we fail.. */
1002 if (reclen > buf->count)
1003 return -EINVAL;
1004 dirent = buf->previous;
1005
1006 if (dirent) {
1007 if (__put_user_unaligned(offset, &dirent->d_off))
1008 goto efault;
1009 }
1010 dirent = buf->current_dir;
1011 if (__put_user_unaligned(ino, &dirent->d_ino))
1012 goto efault;
1013 off = 0;
1014 if (__put_user_unaligned(off, &dirent->d_off))
1015 goto efault;
1016 if (__put_user(reclen, &dirent->d_reclen))
1017 goto efault;
1018 if (__put_user(d_type, &dirent->d_type))
1019 goto efault;
1020 if (copy_to_user(dirent->d_name, name, namlen))
1021 goto efault;
1022 if (__put_user(0, dirent->d_name + namlen))
1023 goto efault;
1024 buf->previous = dirent;
1025 dirent = (void __user *)dirent + reclen;
1026 buf->current_dir = dirent;
1027 buf->count -= reclen;
1028 return 0;
1029efault:
1030 buf->error = -EFAULT;
1031 return -EFAULT;
1032}
1033
1034asmlinkage long compat_sys_getdents64(unsigned int fd,
1035 struct linux_dirent64 __user * dirent, unsigned int count)
1036{
1037 struct file * file;
1038 struct linux_dirent64 __user * lastdirent;
1039 struct compat_getdents_callback64 buf;
1040 int error;
1041
1042 error = -EFAULT;
1043 if (!access_ok(VERIFY_WRITE, dirent, count))
1044 goto out;
1045
1046 error = -EBADF;
1047 file = fget(fd);
1048 if (!file)
1049 goto out;
1050
1051 buf.current_dir = dirent;
1052 buf.previous = NULL;
1053 buf.count = count;
1054 buf.error = 0;
1055
1056 error = vfs_readdir(file, compat_filldir64, &buf);
Al Viro53c9c5c2008-08-24 07:29:52 -04001057 if (error >= 0)
1058 error = buf.error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 lastdirent = buf.previous;
1060 if (lastdirent) {
1061 typeof(lastdirent->d_off) d_off = file->f_pos;
Heiko Carstens7116e992006-12-06 20:36:36 -08001062 if (__put_user_unaligned(d_off, &lastdirent->d_off))
Al Viro53c9c5c2008-08-24 07:29:52 -04001063 error = -EFAULT;
1064 else
1065 error = count - buf.count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 fput(file);
1068out:
1069 return error;
1070}
1071#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1072
1073static ssize_t compat_do_readv_writev(int type, struct file *file,
1074 const struct compat_iovec __user *uvector,
1075 unsigned long nr_segs, loff_t *pos)
1076{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 compat_ssize_t tot_len;
1078 struct iovec iovstack[UIO_FASTIOV];
1079 struct iovec *iov=iovstack, *vector;
1080 ssize_t ret;
1081 int seg;
1082 io_fn_t fn;
1083 iov_fn_t fnv;
1084
1085 /*
1086 * SuS says "The readv() function *may* fail if the iovcnt argument
1087 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
1088 * traditionally returned zero for zero segments, so...
1089 */
1090 ret = 0;
1091 if (nr_segs == 0)
1092 goto out;
1093
1094 /*
1095 * First get the "struct iovec" from user memory and
1096 * verify all the pointers
1097 */
1098 ret = -EINVAL;
1099 if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
1100 goto out;
1101 if (!file->f_op)
1102 goto out;
1103 if (nr_segs > UIO_FASTIOV) {
1104 ret = -ENOMEM;
1105 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
1106 if (!iov)
1107 goto out;
1108 }
1109 ret = -EFAULT;
1110 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1111 goto out;
1112
1113 /*
1114 * Single unix specification:
1115 * We should -EINVAL if an element length is not >= 0 and fitting an
1116 * ssize_t. The total length is fitting an ssize_t
1117 *
1118 * Be careful here because iov_len is a size_t not an ssize_t
1119 */
1120 tot_len = 0;
1121 vector = iov;
1122 ret = -EINVAL;
1123 for (seg = 0 ; seg < nr_segs; seg++) {
1124 compat_ssize_t tmp = tot_len;
1125 compat_ssize_t len;
1126 compat_uptr_t buf;
1127
1128 if (__get_user(len, &uvector->iov_len) ||
1129 __get_user(buf, &uvector->iov_base)) {
1130 ret = -EFAULT;
1131 goto out;
1132 }
1133 if (len < 0) /* size_t not fitting an compat_ssize_t .. */
1134 goto out;
1135 tot_len += len;
1136 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
1137 goto out;
1138 vector->iov_base = compat_ptr(buf);
1139 vector->iov_len = (compat_size_t) len;
1140 uvector++;
1141 vector++;
1142 }
1143 if (tot_len == 0) {
1144 ret = 0;
1145 goto out;
1146 }
1147
1148 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001149 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 goto out;
1151
1152 fnv = NULL;
1153 if (type == READ) {
1154 fn = file->f_op->read;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001155 fnv = file->f_op->aio_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 } else {
1157 fn = (io_fn_t)file->f_op->write;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001158 fnv = file->f_op->aio_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 }
1160
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001161 if (fnv)
1162 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1163 pos, fnv);
1164 else
1165 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167out:
1168 if (iov != iovstack)
1169 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -04001170 if ((ret + (type == READ)) > 0) {
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001171 struct dentry *dentry = file->f_path.dentry;
Robert Love0eeca282005-07-12 17:06:03 -04001172 if (type == READ)
1173 fsnotify_access(dentry);
1174 else
1175 fsnotify_modify(dentry);
1176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 return ret;
1178}
1179
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001180static size_t compat_readv(struct file *file,
1181 const struct compat_iovec __user *vec,
1182 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 ssize_t ret = -EBADF;
1185
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 if (!(file->f_mode & FMODE_READ))
1187 goto out;
1188
1189 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001190 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 goto out;
1192
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001193 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001196 if (ret > 0)
1197 add_rchar(current, ret);
1198 inc_syscr(current);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001199 return ret;
1200}
1201
1202asmlinkage ssize_t
1203compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1204 unsigned long vlen)
1205{
1206 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001207 int fput_needed;
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001208 ssize_t ret;
1209
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001210 file = fget_light(fd, &fput_needed);
Gerd Hoffmanndac12132009-04-02 16:59:20 -07001211 if (!file)
1212 return -EBADF;
1213 ret = compat_readv(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001214 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 return ret;
1216}
1217
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001218asmlinkage ssize_t
1219compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001220 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001221{
1222 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1223 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001224 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001225 ssize_t ret;
1226
1227 if (pos < 0)
1228 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001229 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001230 if (!file)
1231 return -EBADF;
1232 ret = compat_readv(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001233 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001234 return ret;
1235}
1236
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001237static size_t compat_writev(struct file *file,
1238 const struct compat_iovec __user *vec,
1239 unsigned long vlen, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 ssize_t ret = -EBADF;
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 if (!(file->f_mode & FMODE_WRITE))
1244 goto out;
1245
1246 ret = -EINVAL;
Badari Pulavartyee0b3e62006-09-30 23:28:47 -07001247 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 goto out;
1249
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001250 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
1252out:
Gerd Hoffmannca8a5bd2009-01-06 14:41:09 -08001253 if (ret > 0)
1254 add_wchar(current, ret);
1255 inc_syscw(current);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001256 return ret;
1257}
1258
1259asmlinkage ssize_t
1260compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1261 unsigned long vlen)
1262{
1263 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001264 int fput_needed;
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001265 ssize_t ret;
1266
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001267 file = fget_light(fd, &fput_needed);
Gerd Hoffmann6949a632009-04-02 16:59:21 -07001268 if (!file)
1269 return -EBADF;
1270 ret = compat_writev(file, vec, vlen, &file->f_pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001271 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 return ret;
1273}
1274
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001275asmlinkage ssize_t
1276compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
Linus Torvalds601cc112009-04-03 08:03:22 -07001277 unsigned long vlen, u32 pos_low, u32 pos_high)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001278{
1279 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1280 struct file *file;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001281 int fput_needed;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001282 ssize_t ret;
1283
1284 if (pos < 0)
1285 return -EINVAL;
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001286 file = fget_light(fd, &fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001287 if (!file)
1288 return -EBADF;
1289 ret = compat_writev(file, vec, vlen, &pos);
Gerd Hoffmann10c7db22009-04-02 16:59:25 -07001290 fput_light(file, fput_needed);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001291 return ret;
1292}
1293
Andi Kleend2610202006-05-01 12:15:48 -07001294asmlinkage long
1295compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1296 unsigned int nr_segs, unsigned int flags)
1297{
1298 unsigned i;
Al Viro90cbad62006-10-10 22:44:17 +01001299 struct iovec __user *iov;
Jens Axboe98232d52006-05-04 09:13:49 +02001300 if (nr_segs > UIO_MAXIOV)
Andi Kleend2610202006-05-01 12:15:48 -07001301 return -EINVAL;
1302 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1303 for (i = 0; i < nr_segs; i++) {
1304 struct compat_iovec v;
1305 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1306 get_user(v.iov_len, &iov32[i].iov_len) ||
1307 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1308 put_user(v.iov_len, &iov[i].iov_len))
1309 return -EFAULT;
1310 }
1311 return sys_vmsplice(fd, iov, nr_segs, flags);
1312}
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314/*
Miklos Szeredie922efc2005-09-06 15:18:25 -07001315 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1316 * O_LARGEFILE flag.
1317 */
1318asmlinkage long
1319compat_sys_open(const char __user *filename, int flags, int mode)
1320{
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001321 return do_sys_open(AT_FDCWD, filename, flags, mode);
1322}
1323
1324/*
1325 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1326 * O_LARGEFILE flag.
1327 */
1328asmlinkage long
Stephen Rothwell9ad11ab2006-02-02 16:11:51 +11001329compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001330{
1331 return do_sys_open(dfd, filename, flags, mode);
Miklos Szeredie922efc2005-09-06 15:18:25 -07001332}
1333
1334/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 * compat_count() counts the number of arguments/envelopes. It is basically
1336 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1337 * and envp pointers.
1338 */
1339static int compat_count(compat_uptr_t __user *argv, int max)
1340{
1341 int i = 0;
1342
1343 if (argv != NULL) {
1344 for (;;) {
1345 compat_uptr_t p;
1346
1347 if (get_user(p, argv))
1348 return -EFAULT;
1349 if (!p)
1350 break;
1351 argv++;
Jason Baron362e6662008-10-15 22:01:52 -07001352 if (i++ >= max)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 return -E2BIG;
1354 }
1355 }
1356 return i;
1357}
1358
1359/*
1360 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1361 * except that it works with 32 bit argv and envp pointers.
1362 */
1363static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1364 struct linux_binprm *bprm)
1365{
1366 struct page *kmapped_page = NULL;
1367 char *kaddr = NULL;
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001368 unsigned long kpos = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 int ret;
1370
1371 while (argc-- > 0) {
1372 compat_uptr_t str;
1373 int len;
1374 unsigned long pos;
1375
1376 if (get_user(str, argv+argc) ||
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001377 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 ret = -EFAULT;
1379 goto out;
1380 }
1381
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001382 if (len > MAX_ARG_STRLEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 ret = -E2BIG;
1384 goto out;
1385 }
1386
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001387 /* We're going to work our way backwords. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 pos = bprm->p;
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001389 str += len;
1390 bprm->p -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
1392 while (len > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 int offset, bytes_to_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
1395 offset = pos % PAGE_SIZE;
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001396 if (offset == 0)
1397 offset = PAGE_SIZE;
1398
1399 bytes_to_copy = offset;
1400 if (bytes_to_copy > len)
1401 bytes_to_copy = len;
1402
1403 offset -= bytes_to_copy;
1404 pos -= bytes_to_copy;
1405 str -= bytes_to_copy;
1406 len -= bytes_to_copy;
1407
1408 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1409 struct page *page;
1410
1411#ifdef CONFIG_STACK_GROWSUP
1412 ret = expand_stack_downwards(bprm->vma, pos);
1413 if (ret < 0) {
1414 /* We've exceed the stack rlimit. */
1415 ret = -E2BIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 goto out;
1417 }
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001418#endif
1419 ret = get_user_pages(current, bprm->mm, pos,
1420 1, 1, 1, &page, NULL);
1421 if (ret <= 0) {
1422 /* We've exceed the stack rlimit. */
1423 ret = -E2BIG;
1424 goto out;
1425 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001427 if (kmapped_page) {
1428 flush_kernel_dcache_page(kmapped_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 kunmap(kmapped_page);
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001430 put_page(kmapped_page);
1431 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 kmapped_page = page;
1433 kaddr = kmap(kmapped_page);
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001434 kpos = pos & PAGE_MASK;
1435 flush_cache_page(bprm->vma, kpos,
1436 page_to_pfn(kmapped_page));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 }
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001438 if (copy_from_user(kaddr+offset, compat_ptr(str),
1439 bytes_to_copy)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 ret = -EFAULT;
1441 goto out;
1442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 }
1444 }
1445 ret = 0;
1446out:
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001447 if (kmapped_page) {
1448 flush_kernel_dcache_page(kmapped_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 kunmap(kmapped_page);
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001450 put_page(kmapped_page);
1451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 return ret;
1453}
1454
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455/*
1456 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1457 * that it processes 32 bit argv and envp pointers.
1458 */
1459int compat_do_execve(char * filename,
1460 compat_uptr_t __user *argv,
1461 compat_uptr_t __user *envp,
1462 struct pt_regs * regs)
1463{
1464 struct linux_binprm *bprm;
1465 struct file *file;
Hugh Dickins53e93092009-03-28 23:16:03 +00001466 struct files_struct *displaced;
Oleg Nesterov8c652f92009-04-24 01:01:56 +02001467 bool clear_in_exec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
Hugh Dickins53e93092009-03-28 23:16:03 +00001470 retval = unshare_files(&displaced);
1471 if (retval)
1472 goto out_ret;
1473
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 retval = -ENOMEM;
Oliver Neukum11b0b5a2006-03-25 03:08:13 -08001475 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 if (!bprm)
Hugh Dickins53e93092009-03-28 23:16:03 +00001477 goto out_files;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Oleg Nesterova2a84742009-09-05 11:17:13 -07001479 retval = prepare_bprm_creds(bprm);
1480 if (retval)
David Howellsa6f76f22008-11-14 10:39:24 +11001481 goto out_free;
Al Viro498052b2009-03-30 07:20:30 -04001482
1483 retval = check_unsafe_exec(bprm);
Oleg Nesterov8c652f92009-04-24 01:01:56 +02001484 if (retval < 0)
Oleg Nesterova2a84742009-09-05 11:17:13 -07001485 goto out_free;
Oleg Nesterov8c652f92009-04-24 01:01:56 +02001486 clear_in_exec = retval;
Oleg Nesterova2a84742009-09-05 11:17:13 -07001487 current->in_execve = 1;
David Howellsa6f76f22008-11-14 10:39:24 +11001488
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 file = open_exec(filename);
1490 retval = PTR_ERR(file);
1491 if (IS_ERR(file))
Al Viro498052b2009-03-30 07:20:30 -04001492 goto out_unmark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
1494 sched_exec();
1495
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 bprm->file = file;
1497 bprm->filename = filename;
1498 bprm->interp = filename;
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001499
1500 retval = bprm_mm_init(bprm);
1501 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 goto out_file;
1503
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001504 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 if ((retval = bprm->argc) < 0)
David Howellsa6f76f22008-11-14 10:39:24 +11001506 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001508 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 if ((retval = bprm->envc) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 goto out;
1511
1512 retval = prepare_binprm(bprm);
1513 if (retval < 0)
1514 goto out;
1515
1516 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1517 if (retval < 0)
1518 goto out;
1519
1520 bprm->exec = bprm->p;
1521 retval = compat_copy_strings(bprm->envc, envp, bprm);
1522 if (retval < 0)
1523 goto out;
1524
1525 retval = compat_copy_strings(bprm->argc, argv, bprm);
1526 if (retval < 0)
1527 goto out;
1528
1529 retval = search_binary_handler(bprm, regs);
David Howellsa6f76f22008-11-14 10:39:24 +11001530 if (retval < 0)
1531 goto out;
1532
Stefani Seibold89240ba2009-11-03 10:22:40 +01001533 current->stack_start = current->mm->start_stack;
1534
David Howellsa6f76f22008-11-14 10:39:24 +11001535 /* execve succeeded */
Al Viro498052b2009-03-30 07:20:30 -04001536 current->fs->in_exec = 0;
Kentaro Takedaf9ce1f12009-02-05 17:18:11 +09001537 current->in_execve = 0;
David Howellsa6f76f22008-11-14 10:39:24 +11001538 acct_update_integrals(current);
1539 free_bprm(bprm);
Hugh Dickins53e93092009-03-28 23:16:03 +00001540 if (displaced)
1541 put_files_struct(displaced);
David Howellsa6f76f22008-11-14 10:39:24 +11001542 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
1544out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 if (bprm->mm)
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001546 mmput(bprm->mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
1548out_file:
1549 if (bprm->file) {
1550 allow_write_access(bprm->file);
1551 fput(bprm->file);
1552 }
1553
Al Viro498052b2009-03-30 07:20:30 -04001554out_unmark:
Oleg Nesterov8c652f92009-04-24 01:01:56 +02001555 if (clear_in_exec)
1556 current->fs->in_exec = 0;
Kentaro Takedaf9ce1f12009-02-05 17:18:11 +09001557 current->in_execve = 0;
David Howellsa6f76f22008-11-14 10:39:24 +11001558
1559out_free:
Al Viro08a6fac2008-05-10 16:38:25 -04001560 free_bprm(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Hugh Dickins53e93092009-03-28 23:16:03 +00001562out_files:
1563 if (displaced)
1564 reset_files_struct(displaced);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565out_ret:
1566 return retval;
1567}
1568
1569#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1570
Thomas Gleixnerb773ad42008-08-31 08:16:57 -07001571static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1572 int timeval, int ret)
1573{
1574 struct timespec ts;
1575
1576 if (!p)
1577 return ret;
1578
1579 if (current->personality & STICKY_TIMEOUTS)
1580 goto sticky;
1581
1582 /* No update for zero timeout */
1583 if (!end_time->tv_sec && !end_time->tv_nsec)
1584 return ret;
1585
1586 ktime_get_ts(&ts);
1587 ts = timespec_sub(*end_time, ts);
1588 if (ts.tv_sec < 0)
1589 ts.tv_sec = ts.tv_nsec = 0;
1590
1591 if (timeval) {
1592 struct compat_timeval rtv;
1593
1594 rtv.tv_sec = ts.tv_sec;
1595 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1596
1597 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1598 return ret;
1599 } else {
1600 struct compat_timespec rts;
1601
1602 rts.tv_sec = ts.tv_sec;
1603 rts.tv_nsec = ts.tv_nsec;
1604
1605 if (!copy_to_user(p, &rts, sizeof(rts)))
1606 return ret;
1607 }
1608 /*
1609 * If an application puts its timeval in read-only memory, we
1610 * don't want the Linux-specific update to the timeval to
1611 * cause a fault after the select has completed
1612 * successfully. However, because we're not updating the
1613 * timeval, we can't restart the system call.
1614 */
1615
1616sticky:
1617 if (ret == -ERESTARTNOHAND)
1618 ret = -EINTR;
1619 return ret;
1620}
1621
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622/*
1623 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1624 * 64-bit unsigned longs.
1625 */
Arjan van de Ven858119e2006-01-14 13:20:43 -08001626static
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1628 unsigned long *fdset)
1629{
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001630 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 if (ufdset) {
1632 unsigned long odd;
1633
1634 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1635 return -EFAULT;
1636
1637 odd = nr & 1UL;
1638 nr &= ~1UL;
1639 while (nr) {
1640 unsigned long h, l;
Heiko Carstens7116e992006-12-06 20:36:36 -08001641 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1642 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 ufdset += 2;
1644 *fdset++ = h << 32 | l;
1645 nr -= 2;
1646 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001647 if (odd && __get_user(*fdset, ufdset))
1648 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 } else {
1650 /* Tricky, must clear full unsigned long in the
1651 * kernel fdset at the end, this makes sure that
1652 * actually happens.
1653 */
1654 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1655 }
1656 return 0;
1657}
1658
Arjan van de Ven858119e2006-01-14 13:20:43 -08001659static
Heiko Carstens7116e992006-12-06 20:36:36 -08001660int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1661 unsigned long *fdset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662{
1663 unsigned long odd;
Milind Arun Choudhary022a1692007-05-08 00:29:02 -07001664 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665
1666 if (!ufdset)
Heiko Carstens7116e992006-12-06 20:36:36 -08001667 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668
1669 odd = nr & 1UL;
1670 nr &= ~1UL;
1671 while (nr) {
1672 unsigned long h, l;
1673 l = *fdset++;
1674 h = l >> 32;
Heiko Carstens7116e992006-12-06 20:36:36 -08001675 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1676 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 ufdset += 2;
1678 nr -= 2;
1679 }
Heiko Carstens7116e992006-12-06 20:36:36 -08001680 if (odd && __put_user(*fdset, ufdset))
1681 return -EFAULT;
1682 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683}
1684
1685
1686/*
1687 * This is a virtual copy of sys_select from fs/select.c and probably
1688 * should be compared to it from time to time
1689 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690
1691/*
1692 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1693 * like to be certain this leads to no problems. So I return
1694 * EINTR just for safety.
1695 *
1696 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1697 * I'm trying ERESTARTNOHAND which restart only when you want to.
1698 */
1699#define MAX_SELECT_SECONDS \
1700 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1701
David Woodhouse9f729492006-01-18 17:44:05 -08001702int compat_core_sys_select(int n, compat_ulong_t __user *inp,
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001703 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1704 struct timespec *end_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705{
1706 fd_set_bits fds;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001707 void *bits;
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001708 int size, max_fds, ret = -EINVAL;
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001709 struct fdtable *fdt;
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001710 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 if (n < 0)
1713 goto out_nofds;
1714
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001715 /* max_fds can increase, so grab it once to avoid race */
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001716 rcu_read_lock();
Linus Torvaldsa4531ed2005-09-09 15:10:52 -07001717 fdt = files_fdtable(current->files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001718 max_fds = fdt->max_fds;
Linus Torvaldsac5b8b62005-09-09 15:42:34 -07001719 rcu_read_unlock();
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08001720 if (n > max_fds)
1721 n = max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
1723 /*
1724 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1725 * since we used fdset we need to allocate memory in units of
1726 * long-words.
1727 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 size = FDS_BYTES(n);
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001729 bits = stack_fds;
1730 if (size > sizeof(stack_fds) / 6) {
1731 bits = kmalloc(6 * size, GFP_KERNEL);
1732 ret = -ENOMEM;
1733 if (!bits)
1734 goto out_nofds;
1735 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 fds.in = (unsigned long *) bits;
1737 fds.out = (unsigned long *) (bits + size);
1738 fds.ex = (unsigned long *) (bits + 2*size);
1739 fds.res_in = (unsigned long *) (bits + 3*size);
1740 fds.res_out = (unsigned long *) (bits + 4*size);
1741 fds.res_ex = (unsigned long *) (bits + 5*size);
1742
1743 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1744 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1745 (ret = compat_get_fd_set(n, exp, fds.ex)))
1746 goto out;
1747 zero_fd_set(n, fds.res_in);
1748 zero_fd_set(n, fds.res_out);
1749 zero_fd_set(n, fds.res_ex);
1750
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001751 ret = do_select(n, &fds, end_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
1753 if (ret < 0)
1754 goto out;
1755 if (!ret) {
1756 ret = -ERESTARTNOHAND;
1757 if (signal_pending(current))
1758 goto out;
1759 ret = 0;
1760 }
1761
Heiko Carstens7116e992006-12-06 20:36:36 -08001762 if (compat_set_fd_set(n, inp, fds.res_in) ||
1763 compat_set_fd_set(n, outp, fds.res_out) ||
1764 compat_set_fd_set(n, exp, fds.res_ex))
1765 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766out:
Badari Pulavarty6087b2d2007-05-23 13:57:45 -07001767 if (bits != stack_fds)
1768 kfree(bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769out_nofds:
1770 return ret;
1771}
1772
David Woodhouse9f729492006-01-18 17:44:05 -08001773asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1774 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1775 struct compat_timeval __user *tvp)
1776{
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001777 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001778 struct compat_timeval tv;
1779 int ret;
1780
1781 if (tvp) {
1782 if (copy_from_user(&tv, tvp, sizeof(tv)))
1783 return -EFAULT;
1784
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001785 to = &end_time;
Arjan van de Ven4d36a9e2008-10-25 12:41:41 -07001786 if (poll_select_set_timeout(to,
1787 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1788 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
David Woodhouse9f729492006-01-18 17:44:05 -08001789 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001790 }
1791
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001792 ret = compat_core_sys_select(n, inp, outp, exp, to);
1793 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001794
1795 return ret;
1796}
1797
Christoph Hellwig5d0e5282010-03-10 15:21:13 -08001798struct compat_sel_arg_struct {
1799 compat_ulong_t n;
1800 compat_uptr_t inp;
1801 compat_uptr_t outp;
1802 compat_uptr_t exp;
1803 compat_uptr_t tvp;
1804};
1805
1806asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1807{
1808 struct compat_sel_arg_struct a;
1809
1810 if (copy_from_user(&a, arg, sizeof(a)))
1811 return -EFAULT;
1812 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1813 compat_ptr(a.exp), compat_ptr(a.tvp));
1814}
1815
Roland McGrathf3de2722008-04-30 00:53:09 -07001816#ifdef HAVE_SET_RESTORE_SIGMASK
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001817static long do_compat_pselect(int n, compat_ulong_t __user *inp,
David Woodhouse9f729492006-01-18 17:44:05 -08001818 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1819 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1820 compat_size_t sigsetsize)
1821{
1822 compat_sigset_t ss32;
1823 sigset_t ksigmask, sigsaved;
David Woodhouse9f729492006-01-18 17:44:05 -08001824 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001825 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001826 int ret;
1827
1828 if (tsp) {
1829 if (copy_from_user(&ts, tsp, sizeof(ts)))
1830 return -EFAULT;
1831
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001832 to = &end_time;
1833 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
David Woodhouse9f729492006-01-18 17:44:05 -08001834 return -EINVAL;
1835 }
1836
1837 if (sigmask) {
1838 if (sigsetsize != sizeof(compat_sigset_t))
1839 return -EINVAL;
1840 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1841 return -EFAULT;
1842 sigset_from_compat(&ksigmask, &ss32);
1843
1844 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1845 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1846 }
1847
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001848 ret = compat_core_sys_select(n, inp, outp, exp, to);
1849 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001850
1851 if (ret == -ERESTARTNOHAND) {
1852 /*
1853 * Don't restore the signal mask yet. Let do_signal() deliver
1854 * the signal on the way back to userspace, before the signal
1855 * mask is restored.
1856 */
1857 if (sigmask) {
1858 memcpy(&current->saved_sigmask, &sigsaved,
1859 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001860 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001861 }
1862 } else if (sigmask)
1863 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1864
1865 return ret;
1866}
1867
1868asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1869 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1870 struct compat_timespec __user *tsp, void __user *sig)
1871{
1872 compat_size_t sigsetsize = 0;
1873 compat_uptr_t up = 0;
1874
1875 if (sig) {
1876 if (!access_ok(VERIFY_READ, sig,
1877 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1878 __get_user(up, (compat_uptr_t __user *)sig) ||
1879 __get_user(sigsetsize,
1880 (compat_size_t __user *)(sig+sizeof(up))))
1881 return -EFAULT;
1882 }
Heiko Carstensc9da9f22009-01-14 14:13:57 +01001883 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1884 sigsetsize);
David Woodhouse9f729492006-01-18 17:44:05 -08001885}
1886
1887asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1888 unsigned int nfds, struct compat_timespec __user *tsp,
1889 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1890{
1891 compat_sigset_t ss32;
1892 sigset_t ksigmask, sigsaved;
1893 struct compat_timespec ts;
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001894 struct timespec end_time, *to = NULL;
David Woodhouse9f729492006-01-18 17:44:05 -08001895 int ret;
1896
1897 if (tsp) {
1898 if (copy_from_user(&ts, tsp, sizeof(ts)))
1899 return -EFAULT;
1900
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001901 to = &end_time;
1902 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1903 return -EINVAL;
David Woodhouse9f729492006-01-18 17:44:05 -08001904 }
1905
1906 if (sigmask) {
Alexey Dobriyan3835a9b2006-05-15 09:44:27 -07001907 if (sigsetsize != sizeof(compat_sigset_t))
David Woodhouse9f729492006-01-18 17:44:05 -08001908 return -EINVAL;
1909 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1910 return -EFAULT;
1911 sigset_from_compat(&ksigmask, &ss32);
1912
1913 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1914 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1915 }
1916
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001917 ret = do_sys_poll(ufds, nfds, to);
David Woodhouse9f729492006-01-18 17:44:05 -08001918
1919 /* We can restart this syscall, usually */
1920 if (ret == -EINTR) {
1921 /*
1922 * Don't restore the signal mask yet. Let do_signal() deliver
1923 * the signal on the way back to userspace, before the signal
1924 * mask is restored.
1925 */
1926 if (sigmask) {
1927 memcpy(&current->saved_sigmask, &sigsaved,
1928 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07001929 set_restore_sigmask();
David Woodhouse9f729492006-01-18 17:44:05 -08001930 }
1931 ret = -ERESTARTNOHAND;
1932 } else if (sigmask)
1933 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1934
Arjan van de Ven8ff3e8e2008-08-31 08:26:40 -07001935 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
David Woodhouse9f729492006-01-18 17:44:05 -08001936
1937 return ret;
1938}
Roland McGrathf3de2722008-04-30 00:53:09 -07001939#endif /* HAVE_SET_RESTORE_SIGMASK */
David Woodhouse9f729492006-01-18 17:44:05 -08001940
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1942/* Stuff for NFS server syscalls... */
1943struct compat_nfsctl_svc {
1944 u16 svc32_port;
1945 s32 svc32_nthreads;
1946};
1947
1948struct compat_nfsctl_client {
1949 s8 cl32_ident[NFSCLNT_IDMAX+1];
1950 s32 cl32_naddr;
1951 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1952 s32 cl32_fhkeytype;
1953 s32 cl32_fhkeylen;
1954 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1955};
1956
1957struct compat_nfsctl_export {
1958 char ex32_client[NFSCLNT_IDMAX+1];
1959 char ex32_path[NFS_MAXPATHLEN+1];
1960 compat_dev_t ex32_dev;
1961 compat_ino_t ex32_ino;
1962 compat_int_t ex32_flags;
Stephen Rothwell202e5972005-09-06 15:16:40 -07001963 __compat_uid_t ex32_anon_uid;
1964 __compat_gid_t ex32_anon_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965};
1966
1967struct compat_nfsctl_fdparm {
1968 struct sockaddr gd32_addr;
1969 s8 gd32_path[NFS_MAXPATHLEN+1];
1970 compat_int_t gd32_version;
1971};
1972
1973struct compat_nfsctl_fsparm {
1974 struct sockaddr gd32_addr;
1975 s8 gd32_path[NFS_MAXPATHLEN+1];
1976 compat_int_t gd32_maxlen;
1977};
1978
1979struct compat_nfsctl_arg {
1980 compat_int_t ca32_version; /* safeguard */
1981 union {
1982 struct compat_nfsctl_svc u32_svc;
1983 struct compat_nfsctl_client u32_client;
1984 struct compat_nfsctl_export u32_export;
1985 struct compat_nfsctl_fdparm u32_getfd;
1986 struct compat_nfsctl_fsparm u32_getfs;
1987 } u;
1988#define ca32_svc u.u32_svc
1989#define ca32_client u.u32_client
1990#define ca32_export u.u32_export
1991#define ca32_getfd u.u32_getfd
1992#define ca32_getfs u.u32_getfs
1993};
1994
1995union compat_nfsctl_res {
1996 __u8 cr32_getfh[NFS_FHSIZE];
1997 struct knfsd_fh cr32_getfs;
1998};
1999
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002000static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2001 struct compat_nfsctl_arg __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002{
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002003 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2004 get_user(karg->ca_version, &arg->ca32_version) ||
2005 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2006 __get_user(karg->ca_svc.svc_nthreads,
2007 &arg->ca32_svc.svc32_nthreads))
2008 return -EFAULT;
2009 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010}
2011
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002012static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2013 struct compat_nfsctl_arg __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014{
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002015 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2016 sizeof(arg->ca32_client)) ||
2017 get_user(karg->ca_version, &arg->ca32_version) ||
2018 __copy_from_user(&karg->ca_client.cl_ident[0],
2019 &arg->ca32_client.cl32_ident[0],
2020 NFSCLNT_IDMAX) ||
2021 __get_user(karg->ca_client.cl_naddr,
2022 &arg->ca32_client.cl32_naddr) ||
2023 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2024 &arg->ca32_client.cl32_addrlist[0],
2025 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2026 __get_user(karg->ca_client.cl_fhkeytype,
2027 &arg->ca32_client.cl32_fhkeytype) ||
2028 __get_user(karg->ca_client.cl_fhkeylen,
2029 &arg->ca32_client.cl32_fhkeylen) ||
2030 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2031 &arg->ca32_client.cl32_fhkey[0],
2032 NFSCLNT_KEYMAX))
2033 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002035 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036}
2037
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002038static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2039 struct compat_nfsctl_arg __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040{
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002041 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2042 sizeof(arg->ca32_export)) ||
2043 get_user(karg->ca_version, &arg->ca32_version) ||
2044 __copy_from_user(&karg->ca_export.ex_client[0],
2045 &arg->ca32_export.ex32_client[0],
2046 NFSCLNT_IDMAX) ||
2047 __copy_from_user(&karg->ca_export.ex_path[0],
2048 &arg->ca32_export.ex32_path[0],
2049 NFS_MAXPATHLEN) ||
2050 __get_user(karg->ca_export.ex_dev,
2051 &arg->ca32_export.ex32_dev) ||
2052 __get_user(karg->ca_export.ex_ino,
2053 &arg->ca32_export.ex32_ino) ||
2054 __get_user(karg->ca_export.ex_flags,
2055 &arg->ca32_export.ex32_flags) ||
2056 __get_user(karg->ca_export.ex_anon_uid,
2057 &arg->ca32_export.ex32_anon_uid) ||
2058 __get_user(karg->ca_export.ex_anon_gid,
2059 &arg->ca32_export.ex32_anon_gid))
2060 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2062 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2063
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002064 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065}
2066
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002067static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2068 struct compat_nfsctl_arg __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069{
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002070 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2071 sizeof(arg->ca32_getfd)) ||
2072 get_user(karg->ca_version, &arg->ca32_version) ||
2073 __copy_from_user(&karg->ca_getfd.gd_addr,
2074 &arg->ca32_getfd.gd32_addr,
2075 (sizeof(struct sockaddr))) ||
2076 __copy_from_user(&karg->ca_getfd.gd_path,
2077 &arg->ca32_getfd.gd32_path,
2078 (NFS_MAXPATHLEN+1)) ||
2079 __get_user(karg->ca_getfd.gd_version,
2080 &arg->ca32_getfd.gd32_version))
2081 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002083 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084}
2085
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002086static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2087 struct compat_nfsctl_arg __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088{
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002089 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2090 get_user(karg->ca_version, &arg->ca32_version) ||
2091 __copy_from_user(&karg->ca_getfs.gd_addr,
2092 &arg->ca32_getfs.gd32_addr,
2093 (sizeof(struct sockaddr))) ||
2094 __copy_from_user(&karg->ca_getfs.gd_path,
2095 &arg->ca32_getfs.gd32_path,
2096 (NFS_MAXPATHLEN+1)) ||
2097 __get_user(karg->ca_getfs.gd_maxlen,
2098 &arg->ca32_getfs.gd32_maxlen))
2099 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002101 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102}
2103
2104/* This really doesn't need translations, we are only passing
2105 * back a union which contains opaque nfs file handle data.
2106 */
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002107static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2108 union compat_nfsctl_res __user *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109{
2110 int err;
2111
2112 err = copy_to_user(res, kres, sizeof(*res));
2113
2114 return (err) ? -EFAULT : 0;
2115}
2116
Lin Feng Shend64b1c82006-05-20 14:59:49 -07002117asmlinkage long compat_sys_nfsservctl(int cmd,
2118 struct compat_nfsctl_arg __user *arg,
2119 union compat_nfsctl_res __user *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120{
2121 struct nfsctl_arg *karg;
2122 union nfsctl_res *kres;
2123 mm_segment_t oldfs;
2124 int err;
2125
2126 karg = kmalloc(sizeof(*karg), GFP_USER);
2127 kres = kmalloc(sizeof(*kres), GFP_USER);
2128 if(!karg || !kres) {
2129 err = -ENOMEM;
2130 goto done;
2131 }
2132
2133 switch(cmd) {
2134 case NFSCTL_SVC:
2135 err = compat_nfs_svc_trans(karg, arg);
2136 break;
2137
2138 case NFSCTL_ADDCLIENT:
2139 err = compat_nfs_clnt_trans(karg, arg);
2140 break;
2141
2142 case NFSCTL_DELCLIENT:
2143 err = compat_nfs_clnt_trans(karg, arg);
2144 break;
2145
2146 case NFSCTL_EXPORT:
2147 case NFSCTL_UNEXPORT:
2148 err = compat_nfs_exp_trans(karg, arg);
2149 break;
2150
2151 case NFSCTL_GETFD:
2152 err = compat_nfs_getfd_trans(karg, arg);
2153 break;
2154
2155 case NFSCTL_GETFS:
2156 err = compat_nfs_getfs_trans(karg, arg);
2157 break;
2158
2159 default:
2160 err = -EINVAL;
Peter Staubach57070d02006-03-25 03:08:04 -08002161 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 }
2163
Peter Staubach57070d02006-03-25 03:08:04 -08002164 if (err)
2165 goto done;
2166
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 oldfs = get_fs();
2168 set_fs(KERNEL_DS);
2169 /* The __user pointer casts are valid because of the set_fs() */
2170 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2171 set_fs(oldfs);
2172
2173 if (err)
2174 goto done;
2175
2176 if((cmd == NFSCTL_GETFD) ||
2177 (cmd == NFSCTL_GETFS))
2178 err = compat_nfs_getfh_res_trans(kres, res);
2179
2180done:
2181 kfree(karg);
2182 kfree(kres);
2183 return err;
2184}
2185#else /* !NFSD */
2186long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2187{
2188 return sys_ni_syscall();
2189}
2190#endif
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002191
2192#ifdef CONFIG_EPOLL
2193
Roland McGrathf3de2722008-04-30 00:53:09 -07002194#ifdef HAVE_SET_RESTORE_SIGMASK
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002195asmlinkage long compat_sys_epoll_pwait(int epfd,
2196 struct compat_epoll_event __user *events,
2197 int maxevents, int timeout,
2198 const compat_sigset_t __user *sigmask,
2199 compat_size_t sigsetsize)
2200{
2201 long err;
2202 compat_sigset_t csigmask;
2203 sigset_t ksigmask, sigsaved;
2204
2205 /*
2206 * If the caller wants a certain signal mask to be set during the wait,
2207 * we apply it here.
2208 */
2209 if (sigmask) {
2210 if (sigsetsize != sizeof(compat_sigset_t))
2211 return -EINVAL;
2212 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2213 return -EFAULT;
2214 sigset_from_compat(&ksigmask, &csigmask);
2215 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2216 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2217 }
2218
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002219 err = sys_epoll_wait(epfd, events, maxevents, timeout);
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002220
2221 /*
2222 * If we changed the signal mask, we need to restore the original one.
2223 * In case we've got a signal while waiting, we do not restore the
2224 * signal mask yet, and we allow do_signal() to deliver the signal on
2225 * the way back to userspace, before the signal mask is restored.
2226 */
2227 if (sigmask) {
2228 if (err == -EINTR) {
2229 memcpy(&current->saved_sigmask, &sigsaved,
2230 sizeof(sigsaved));
Roland McGrath4e4c22c2008-04-30 00:53:06 -07002231 set_restore_sigmask();
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002232 } else
2233 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2234 }
2235
2236 return err;
2237}
Roland McGrathf3de2722008-04-30 00:53:09 -07002238#endif /* HAVE_SET_RESTORE_SIGMASK */
Davide Libenzif6dfb4f2007-03-07 20:41:21 -08002239
2240#endif /* CONFIG_EPOLL */
Davide Libenzi6d18c922007-05-10 22:23:15 -07002241
2242#ifdef CONFIG_SIGNALFD
2243
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07002244asmlinkage long compat_sys_signalfd4(int ufd,
2245 const compat_sigset_t __user *sigmask,
2246 compat_size_t sigsetsize, int flags)
Davide Libenzi6d18c922007-05-10 22:23:15 -07002247{
2248 compat_sigset_t ss32;
2249 sigset_t tmp;
2250 sigset_t __user *ksigmask;
2251
2252 if (sigsetsize != sizeof(compat_sigset_t))
2253 return -EINVAL;
2254 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2255 return -EFAULT;
2256 sigset_from_compat(&tmp, &ss32);
2257 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2258 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2259 return -EFAULT;
2260
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07002261 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
Davide Libenzi6d18c922007-05-10 22:23:15 -07002262}
2263
Ulrich Drepper9deb27b2008-07-23 21:29:24 -07002264asmlinkage long compat_sys_signalfd(int ufd,
2265 const compat_sigset_t __user *sigmask,
2266 compat_size_t sigsetsize)
2267{
2268 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2269}
Davide Libenzi6d18c922007-05-10 22:23:15 -07002270#endif /* CONFIG_SIGNALFD */
2271
Davide Libenzi83f5d122007-05-10 22:23:18 -07002272#ifdef CONFIG_TIMERFD
2273
Davide Libenzi4d672e72008-02-04 22:27:26 -08002274asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2275 const struct compat_itimerspec __user *utmr,
2276 struct compat_itimerspec __user *otmr)
Davide Libenzi83f5d122007-05-10 22:23:18 -07002277{
Davide Libenzi4d672e72008-02-04 22:27:26 -08002278 int error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07002279 struct itimerspec t;
2280 struct itimerspec __user *ut;
2281
Davide Libenzi83f5d122007-05-10 22:23:18 -07002282 if (get_compat_itimerspec(&t, utmr))
Heiko Carstens8317f142007-05-16 22:11:08 -07002283 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08002284 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2285 if (copy_to_user(&ut[0], &t, sizeof(t)))
Heiko Carstens8317f142007-05-16 22:11:08 -07002286 return -EFAULT;
Davide Libenzi4d672e72008-02-04 22:27:26 -08002287 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2288 if (!error && otmr)
2289 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2290 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
Davide Libenzi83f5d122007-05-10 22:23:18 -07002291
Davide Libenzi4d672e72008-02-04 22:27:26 -08002292 return error;
2293}
2294
2295asmlinkage long compat_sys_timerfd_gettime(int ufd,
2296 struct compat_itimerspec __user *otmr)
2297{
2298 int error;
2299 struct itimerspec t;
2300 struct itimerspec __user *ut;
2301
2302 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2303 error = sys_timerfd_gettime(ufd, ut);
2304 if (!error)
2305 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2306 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2307
2308 return error;
Davide Libenzi83f5d122007-05-10 22:23:18 -07002309}
2310
2311#endif /* CONFIG_TIMERFD */