Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 | |
a2531293 | 11 | * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) |
1da177e4 LT |
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 | ||
85c9fe8f | 18 | #include <linux/stddef.h> |
022a1692 | 19 | #include <linux/kernel.h> |
1da177e4 LT |
20 | #include <linux/linkage.h> |
21 | #include <linux/compat.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/time.h> | |
5b825c3a | 24 | #include <linux/cred.h> |
1da177e4 LT |
25 | #include <linux/fs.h> |
26 | #include <linux/fcntl.h> | |
27 | #include <linux/namei.h> | |
28 | #include <linux/file.h> | |
9f3acc31 | 29 | #include <linux/fdtable.h> |
1da177e4 | 30 | #include <linux/vfs.h> |
1da177e4 LT |
31 | #include <linux/ioctl.h> |
32 | #include <linux/init.h> | |
1da177e4 | 33 | #include <linux/ncp_mount.h> |
9a9947bf | 34 | #include <linux/nfs4_mount.h> |
1da177e4 LT |
35 | #include <linux/syscalls.h> |
36 | #include <linux/ctype.h> | |
1da177e4 | 37 | #include <linux/dirent.h> |
0eeca283 | 38 | #include <linux/fsnotify.h> |
1da177e4 | 39 | #include <linux/highuid.h> |
1da177e4 LT |
40 | #include <linux/personality.h> |
41 | #include <linux/rwsem.h> | |
8f0ab514 | 42 | #include <linux/tsacct_kern.h> |
6272e266 | 43 | #include <linux/security.h> |
a1f8e7f7 | 44 | #include <linux/highmem.h> |
6d18c922 | 45 | #include <linux/signal.h> |
bd01f843 | 46 | #include <linux/poll.h> |
4a805e86 | 47 | #include <linux/mm.h> |
498052bb | 48 | #include <linux/fs_struct.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
504b701b | 50 | #include <linux/pagemap.h> |
a27bb332 | 51 | #include <linux/aio.h> |
1da177e4 | 52 | |
7c0f6ba6 | 53 | #include <linux/uaccess.h> |
1da177e4 LT |
54 | #include <asm/mmu_context.h> |
55 | #include <asm/ioctls.h> | |
07f3f05c | 56 | #include "internal.h" |
9f72949f | 57 | |
1da177e4 LT |
58 | /* |
59 | * Not all architectures have sys_utime, so implement this in terms | |
60 | * of sys_utimes. | |
61 | */ | |
625b1d7e HC |
62 | COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename, |
63 | struct compat_utimbuf __user *, t) | |
1da177e4 | 64 | { |
1c710c89 | 65 | struct timespec tv[2]; |
1da177e4 LT |
66 | |
67 | if (t) { | |
68 | if (get_user(tv[0].tv_sec, &t->actime) || | |
69 | get_user(tv[1].tv_sec, &t->modtime)) | |
70 | return -EFAULT; | |
1c710c89 UD |
71 | tv[0].tv_nsec = 0; |
72 | tv[1].tv_nsec = 0; | |
1da177e4 | 73 | } |
1c710c89 UD |
74 | return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); |
75 | } | |
76 | ||
625b1d7e | 77 | COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags) |
1c710c89 UD |
78 | { |
79 | struct timespec tv[2]; | |
80 | ||
81 | if (t) { | |
81993e81 PA |
82 | if (compat_get_timespec(&tv[0], &t[0]) || |
83 | compat_get_timespec(&tv[1], &t[1])) | |
1c710c89 UD |
84 | return -EFAULT; |
85 | ||
1c710c89 UD |
86 | if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) |
87 | return 0; | |
88 | } | |
89 | return do_utimes(dfd, filename, t ? tv : NULL, flags); | |
1da177e4 LT |
90 | } |
91 | ||
625b1d7e | 92 | COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd, const char __user *, filename, struct compat_timeval __user *, t) |
1da177e4 | 93 | { |
1c710c89 | 94 | struct timespec tv[2]; |
1da177e4 | 95 | |
9ad11ab4 | 96 | if (t) { |
1da177e4 | 97 | if (get_user(tv[0].tv_sec, &t[0].tv_sec) || |
1c710c89 | 98 | get_user(tv[0].tv_nsec, &t[0].tv_usec) || |
1da177e4 | 99 | get_user(tv[1].tv_sec, &t[1].tv_sec) || |
1c710c89 | 100 | get_user(tv[1].tv_nsec, &t[1].tv_usec)) |
9ad11ab4 | 101 | return -EFAULT; |
1c710c89 UD |
102 | if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || |
103 | tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) | |
104 | return -EINVAL; | |
105 | tv[0].tv_nsec *= 1000; | |
106 | tv[1].tv_nsec *= 1000; | |
9ad11ab4 | 107 | } |
1c710c89 | 108 | return do_utimes(dfd, filename, t ? tv : NULL, 0); |
5590ff0d UD |
109 | } |
110 | ||
625b1d7e | 111 | COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t) |
5590ff0d UD |
112 | { |
113 | return compat_sys_futimesat(AT_FDCWD, filename, t); | |
1da177e4 LT |
114 | } |
115 | ||
f7a5000f CH |
116 | static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf) |
117 | { | |
fcf83067 | 118 | struct compat_stat tmp; |
f7a5000f | 119 | |
fcf83067 AV |
120 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) |
121 | return -EOVERFLOW; | |
f7a5000f | 122 | |
fcf83067 AV |
123 | memset(&tmp, 0, sizeof(tmp)); |
124 | tmp.st_dev = old_encode_dev(stat->dev); | |
125 | tmp.st_ino = stat->ino; | |
126 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) | |
f7a5000f | 127 | return -EOVERFLOW; |
fcf83067 AV |
128 | tmp.st_mode = stat->mode; |
129 | tmp.st_nlink = stat->nlink; | |
130 | if (tmp.st_nlink != stat->nlink) | |
f7a5000f | 131 | return -EOVERFLOW; |
a7c1938e EB |
132 | SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); |
133 | SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); | |
fcf83067 AV |
134 | tmp.st_rdev = old_encode_dev(stat->rdev); |
135 | if ((u64) stat->size > MAX_NON_LFS) | |
136 | return -EOVERFLOW; | |
137 | tmp.st_size = stat->size; | |
138 | tmp.st_atime = stat->atime.tv_sec; | |
139 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
140 | tmp.st_mtime = stat->mtime.tv_sec; | |
141 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
142 | tmp.st_ctime = stat->ctime.tv_sec; | |
143 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
144 | tmp.st_blocks = stat->blocks; | |
145 | tmp.st_blksize = stat->blksize; | |
146 | return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
f7a5000f CH |
147 | } |
148 | ||
625b1d7e HC |
149 | COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename, |
150 | struct compat_stat __user *, statbuf) | |
1da177e4 LT |
151 | { |
152 | struct kstat stat; | |
2eae7a18 | 153 | int error; |
1da177e4 | 154 | |
2eae7a18 CH |
155 | error = vfs_stat(filename, &stat); |
156 | if (error) | |
157 | return error; | |
158 | return cp_compat_stat(&stat, statbuf); | |
1da177e4 LT |
159 | } |
160 | ||
625b1d7e HC |
161 | COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
162 | struct compat_stat __user *, statbuf) | |
1da177e4 LT |
163 | { |
164 | struct kstat stat; | |
2eae7a18 | 165 | int error; |
1da177e4 | 166 | |
2eae7a18 CH |
167 | error = vfs_lstat(filename, &stat); |
168 | if (error) | |
169 | return error; | |
170 | return cp_compat_stat(&stat, statbuf); | |
1da177e4 LT |
171 | } |
172 | ||
82d821dd | 173 | #ifndef __ARCH_WANT_STAT64 |
625b1d7e HC |
174 | COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd, |
175 | const char __user *, filename, | |
176 | struct compat_stat __user *, statbuf, int, flag) | |
5590ff0d UD |
177 | { |
178 | struct kstat stat; | |
0112fc22 | 179 | int error; |
5590ff0d | 180 | |
0112fc22 OD |
181 | error = vfs_fstatat(dfd, filename, &stat, flag); |
182 | if (error) | |
183 | return error; | |
184 | return cp_compat_stat(&stat, statbuf); | |
5590ff0d | 185 | } |
82d821dd | 186 | #endif |
5590ff0d | 187 | |
625b1d7e HC |
188 | COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd, |
189 | struct compat_stat __user *, statbuf) | |
1da177e4 LT |
190 | { |
191 | struct kstat stat; | |
192 | int error = vfs_fstat(fd, &stat); | |
193 | ||
194 | if (!error) | |
195 | error = cp_compat_stat(&stat, statbuf); | |
196 | return error; | |
197 | } | |
198 | ||
199 | static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) | |
200 | { | |
201 | ||
202 | if (sizeof ubuf->f_blocks == 4) { | |
f4a67cce JT |
203 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | |
204 | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) | |
1da177e4 LT |
205 | return -EOVERFLOW; |
206 | /* f_files and f_ffree may be -1; it's okay | |
207 | * to stuff that into 32 bits */ | |
208 | if (kbuf->f_files != 0xffffffffffffffffULL | |
209 | && (kbuf->f_files & 0xffffffff00000000ULL)) | |
210 | return -EOVERFLOW; | |
211 | if (kbuf->f_ffree != 0xffffffffffffffffULL | |
212 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) | |
213 | return -EOVERFLOW; | |
214 | } | |
215 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || | |
216 | __put_user(kbuf->f_type, &ubuf->f_type) || | |
217 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || | |
218 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || | |
219 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || | |
220 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || | |
221 | __put_user(kbuf->f_files, &ubuf->f_files) || | |
222 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || | |
223 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || | |
224 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || | |
225 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || | |
226 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || | |
1448c721 EB |
227 | __put_user(kbuf->f_flags, &ubuf->f_flags) || |
228 | __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) | |
1da177e4 LT |
229 | return -EFAULT; |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
974d879e | 234 | * The following statfs calls are copies of code from fs/statfs.c and |
1da177e4 LT |
235 | * should be checked against those from time to time |
236 | */ | |
625b1d7e | 237 | COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf) |
1da177e4 | 238 | { |
c8b91acc AV |
239 | struct kstatfs tmp; |
240 | int error = user_statfs(pathname, &tmp); | |
241 | if (!error) | |
242 | error = put_compat_statfs(buf, &tmp); | |
1da177e4 LT |
243 | return error; |
244 | } | |
245 | ||
625b1d7e | 246 | COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf) |
1da177e4 | 247 | { |
1da177e4 | 248 | struct kstatfs tmp; |
c8b91acc | 249 | int error = fd_statfs(fd, &tmp); |
86e07ce7 DG |
250 | if (!error) |
251 | error = put_compat_statfs(buf, &tmp); | |
1da177e4 LT |
252 | return error; |
253 | } | |
254 | ||
255 | static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) | |
256 | { | |
64d2ab32 LW |
257 | if (sizeof(ubuf->f_bsize) == 4) { |
258 | if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen | | |
259 | kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL) | |
1da177e4 LT |
260 | return -EOVERFLOW; |
261 | /* f_files and f_ffree may be -1; it's okay | |
262 | * to stuff that into 32 bits */ | |
263 | if (kbuf->f_files != 0xffffffffffffffffULL | |
264 | && (kbuf->f_files & 0xffffffff00000000ULL)) | |
265 | return -EOVERFLOW; | |
266 | if (kbuf->f_ffree != 0xffffffffffffffffULL | |
267 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) | |
268 | return -EOVERFLOW; | |
269 | } | |
270 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || | |
271 | __put_user(kbuf->f_type, &ubuf->f_type) || | |
272 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || | |
273 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || | |
274 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || | |
275 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || | |
276 | __put_user(kbuf->f_files, &ubuf->f_files) || | |
277 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || | |
278 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || | |
279 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || | |
280 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || | |
e0bb6bda NK |
281 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
282 | __put_user(kbuf->f_flags, &ubuf->f_flags) || | |
283 | __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare))) | |
1da177e4 LT |
284 | return -EFAULT; |
285 | return 0; | |
286 | } | |
287 | ||
625b1d7e | 288 | COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf) |
1da177e4 | 289 | { |
c8b91acc | 290 | struct kstatfs tmp; |
1da177e4 LT |
291 | int error; |
292 | ||
293 | if (sz != sizeof(*buf)) | |
294 | return -EINVAL; | |
295 | ||
c8b91acc AV |
296 | error = user_statfs(pathname, &tmp); |
297 | if (!error) | |
298 | error = put_compat_statfs64(buf, &tmp); | |
1da177e4 LT |
299 | return error; |
300 | } | |
301 | ||
625b1d7e | 302 | COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf) |
1da177e4 | 303 | { |
1da177e4 LT |
304 | struct kstatfs tmp; |
305 | int error; | |
306 | ||
307 | if (sz != sizeof(*buf)) | |
308 | return -EINVAL; | |
309 | ||
c8b91acc | 310 | error = fd_statfs(fd, &tmp); |
86e07ce7 DG |
311 | if (!error) |
312 | error = put_compat_statfs64(buf, &tmp); | |
1da177e4 LT |
313 | return error; |
314 | } | |
315 | ||
2b1c6bd7 CH |
316 | /* |
317 | * This is a copy of sys_ustat, just dealing with a structure layout. | |
318 | * Given how simple this syscall is that apporach is more maintainable | |
319 | * than the various conversion hacks. | |
320 | */ | |
625b1d7e | 321 | COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u) |
2b1c6bd7 | 322 | { |
2b1c6bd7 CH |
323 | struct compat_ustat tmp; |
324 | struct kstatfs sbuf; | |
cf31e70d | 325 | int err = vfs_ustat(new_decode_dev(dev), &sbuf); |
2b1c6bd7 CH |
326 | if (err) |
327 | return err; | |
328 | ||
329 | memset(&tmp, 0, sizeof(struct compat_ustat)); | |
330 | tmp.f_tfree = sbuf.f_bfree; | |
331 | tmp.f_tinode = sbuf.f_ffree; | |
332 | if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) | |
333 | return -EFAULT; | |
334 | return 0; | |
335 | } | |
336 | ||
1da177e4 LT |
337 | static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
338 | { | |
339 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || | |
340 | __get_user(kfl->l_type, &ufl->l_type) || | |
341 | __get_user(kfl->l_whence, &ufl->l_whence) || | |
342 | __get_user(kfl->l_start, &ufl->l_start) || | |
343 | __get_user(kfl->l_len, &ufl->l_len) || | |
344 | __get_user(kfl->l_pid, &ufl->l_pid)) | |
345 | return -EFAULT; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) | |
350 | { | |
351 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || | |
352 | __put_user(kfl->l_type, &ufl->l_type) || | |
353 | __put_user(kfl->l_whence, &ufl->l_whence) || | |
354 | __put_user(kfl->l_start, &ufl->l_start) || | |
355 | __put_user(kfl->l_len, &ufl->l_len) || | |
356 | __put_user(kfl->l_pid, &ufl->l_pid)) | |
357 | return -EFAULT; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 | |
362 | static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) | |
363 | { | |
364 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || | |
365 | __get_user(kfl->l_type, &ufl->l_type) || | |
366 | __get_user(kfl->l_whence, &ufl->l_whence) || | |
367 | __get_user(kfl->l_start, &ufl->l_start) || | |
368 | __get_user(kfl->l_len, &ufl->l_len) || | |
369 | __get_user(kfl->l_pid, &ufl->l_pid)) | |
370 | return -EFAULT; | |
371 | return 0; | |
372 | } | |
373 | #endif | |
374 | ||
375 | #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 | |
376 | static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) | |
377 | { | |
378 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || | |
379 | __put_user(kfl->l_type, &ufl->l_type) || | |
380 | __put_user(kfl->l_whence, &ufl->l_whence) || | |
381 | __put_user(kfl->l_start, &ufl->l_start) || | |
382 | __put_user(kfl->l_len, &ufl->l_len) || | |
383 | __put_user(kfl->l_pid, &ufl->l_pid)) | |
384 | return -EFAULT; | |
385 | return 0; | |
386 | } | |
387 | #endif | |
388 | ||
5d50ffd7 JL |
389 | static unsigned int |
390 | convert_fcntl_cmd(unsigned int cmd) | |
391 | { | |
392 | switch (cmd) { | |
393 | case F_GETLK64: | |
394 | return F_GETLK; | |
395 | case F_SETLK64: | |
396 | return F_SETLK; | |
397 | case F_SETLKW64: | |
398 | return F_SETLKW; | |
399 | } | |
400 | ||
401 | return cmd; | |
402 | } | |
403 | ||
932602e2 HC |
404 | COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, |
405 | compat_ulong_t, arg) | |
1da177e4 LT |
406 | { |
407 | mm_segment_t old_fs; | |
408 | struct flock f; | |
409 | long ret; | |
5d50ffd7 | 410 | unsigned int conv_cmd; |
1da177e4 LT |
411 | |
412 | switch (cmd) { | |
413 | case F_GETLK: | |
414 | case F_SETLK: | |
415 | case F_SETLKW: | |
416 | ret = get_compat_flock(&f, compat_ptr(arg)); | |
417 | if (ret != 0) | |
418 | break; | |
419 | old_fs = get_fs(); | |
420 | set_fs(KERNEL_DS); | |
421 | ret = sys_fcntl(fd, cmd, (unsigned long)&f); | |
422 | set_fs(old_fs); | |
423 | if (cmd == F_GETLK && ret == 0) { | |
ff677f8d | 424 | /* GETLK was successful and we need to return the data... |
2520f14c N |
425 | * but it needs to fit in the compat structure. |
426 | * l_start shouldn't be too big, unless the original | |
427 | * start + end is greater than COMPAT_OFF_T_MAX, in which | |
428 | * case the app was asking for trouble, so we return | |
429 | * -EOVERFLOW in that case. | |
430 | * l_len could be too big, in which case we just truncate it, | |
431 | * and only allow the app to see that part of the conflicting | |
432 | * lock that might make sense to it anyway | |
433 | */ | |
434 | ||
435 | if (f.l_start > COMPAT_OFF_T_MAX) | |
1da177e4 | 436 | ret = -EOVERFLOW; |
2520f14c N |
437 | if (f.l_len > COMPAT_OFF_T_MAX) |
438 | f.l_len = COMPAT_OFF_T_MAX; | |
1da177e4 LT |
439 | if (ret == 0) |
440 | ret = put_compat_flock(&f, compat_ptr(arg)); | |
441 | } | |
442 | break; | |
443 | ||
444 | case F_GETLK64: | |
445 | case F_SETLK64: | |
446 | case F_SETLKW64: | |
0d3f7a2d JL |
447 | case F_OFD_GETLK: |
448 | case F_OFD_SETLK: | |
449 | case F_OFD_SETLKW: | |
1da177e4 LT |
450 | ret = get_compat_flock64(&f, compat_ptr(arg)); |
451 | if (ret != 0) | |
452 | break; | |
453 | old_fs = get_fs(); | |
454 | set_fs(KERNEL_DS); | |
5d50ffd7 JL |
455 | conv_cmd = convert_fcntl_cmd(cmd); |
456 | ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f); | |
1da177e4 | 457 | set_fs(old_fs); |
0d3f7a2d | 458 | if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) { |
2520f14c N |
459 | /* need to return lock information - see above for commentary */ |
460 | if (f.l_start > COMPAT_LOFF_T_MAX) | |
1da177e4 | 461 | ret = -EOVERFLOW; |
2520f14c N |
462 | if (f.l_len > COMPAT_LOFF_T_MAX) |
463 | f.l_len = COMPAT_LOFF_T_MAX; | |
1da177e4 LT |
464 | if (ret == 0) |
465 | ret = put_compat_flock64(&f, compat_ptr(arg)); | |
466 | } | |
467 | break; | |
468 | ||
469 | default: | |
470 | ret = sys_fcntl(fd, cmd, arg); | |
471 | break; | |
472 | } | |
473 | return ret; | |
474 | } | |
475 | ||
932602e2 HC |
476 | COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, |
477 | compat_ulong_t, arg) | |
1da177e4 | 478 | { |
5d50ffd7 JL |
479 | switch (cmd) { |
480 | case F_GETLK64: | |
481 | case F_SETLK64: | |
482 | case F_SETLKW64: | |
0d3f7a2d JL |
483 | case F_OFD_GETLK: |
484 | case F_OFD_SETLK: | |
485 | case F_OFD_SETLKW: | |
1da177e4 | 486 | return -EINVAL; |
5d50ffd7 | 487 | } |
1da177e4 LT |
488 | return compat_sys_fcntl64(fd, cmd, arg); |
489 | } | |
490 | ||
b8373363 JM |
491 | /* A write operation does a read from user space and vice versa */ |
492 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) | |
493 | ||
494 | ssize_t compat_rw_copy_check_uvector(int type, | |
495 | const struct compat_iovec __user *uvector, unsigned long nr_segs, | |
496 | unsigned long fast_segs, struct iovec *fast_pointer, | |
ac34ebb3 | 497 | struct iovec **ret_pointer) |
b8373363 JM |
498 | { |
499 | compat_ssize_t tot_len; | |
500 | struct iovec *iov = *ret_pointer = fast_pointer; | |
501 | ssize_t ret = 0; | |
502 | int seg; | |
503 | ||
504 | /* | |
505 | * SuS says "The readv() function *may* fail if the iovcnt argument | |
506 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has | |
507 | * traditionally returned zero for zero segments, so... | |
508 | */ | |
509 | if (nr_segs == 0) | |
510 | goto out; | |
511 | ||
512 | ret = -EINVAL; | |
85e7340f | 513 | if (nr_segs > UIO_MAXIOV) |
b8373363 JM |
514 | goto out; |
515 | if (nr_segs > fast_segs) { | |
516 | ret = -ENOMEM; | |
517 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); | |
6a5640f1 | 518 | if (iov == NULL) |
b8373363 | 519 | goto out; |
b8373363 JM |
520 | } |
521 | *ret_pointer = iov; | |
522 | ||
8aec0f5d MD |
523 | ret = -EFAULT; |
524 | if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) | |
525 | goto out; | |
526 | ||
b8373363 JM |
527 | /* |
528 | * Single unix specification: | |
529 | * We should -EINVAL if an element length is not >= 0 and fitting an | |
435f49a5 | 530 | * ssize_t. |
b8373363 | 531 | * |
435f49a5 LT |
532 | * In Linux, the total length is limited to MAX_RW_COUNT, there is |
533 | * no overflow possibility. | |
b8373363 JM |
534 | */ |
535 | tot_len = 0; | |
536 | ret = -EINVAL; | |
537 | for (seg = 0; seg < nr_segs; seg++) { | |
b8373363 JM |
538 | compat_uptr_t buf; |
539 | compat_ssize_t len; | |
540 | ||
541 | if (__get_user(len, &uvector->iov_len) || | |
542 | __get_user(buf, &uvector->iov_base)) { | |
543 | ret = -EFAULT; | |
544 | goto out; | |
545 | } | |
546 | if (len < 0) /* size_t not fitting in compat_ssize_t .. */ | |
547 | goto out; | |
ac34ebb3 | 548 | if (type >= 0 && |
fcf63409 | 549 | !access_ok(vrfy_dir(type), compat_ptr(buf), len)) { |
b8373363 JM |
550 | ret = -EFAULT; |
551 | goto out; | |
552 | } | |
435f49a5 LT |
553 | if (len > MAX_RW_COUNT - tot_len) |
554 | len = MAX_RW_COUNT - tot_len; | |
555 | tot_len += len; | |
b8373363 JM |
556 | iov->iov_base = compat_ptr(buf); |
557 | iov->iov_len = (compat_size_t) len; | |
558 | uvector++; | |
559 | iov++; | |
560 | } | |
561 | ret = tot_len; | |
562 | ||
563 | out: | |
564 | return ret; | |
565 | } | |
566 | ||
1da177e4 LT |
567 | struct compat_ncp_mount_data { |
568 | compat_int_t version; | |
569 | compat_uint_t ncp_fd; | |
202e5979 | 570 | __compat_uid_t mounted_uid; |
1da177e4 LT |
571 | compat_pid_t wdog_pid; |
572 | unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; | |
573 | compat_uint_t time_out; | |
574 | compat_uint_t retry_count; | |
575 | compat_uint_t flags; | |
202e5979 SR |
576 | __compat_uid_t uid; |
577 | __compat_gid_t gid; | |
1da177e4 LT |
578 | compat_mode_t file_mode; |
579 | compat_mode_t dir_mode; | |
580 | }; | |
581 | ||
582 | struct compat_ncp_mount_data_v4 { | |
583 | compat_int_t version; | |
584 | compat_ulong_t flags; | |
585 | compat_ulong_t mounted_uid; | |
586 | compat_long_t wdog_pid; | |
587 | compat_uint_t ncp_fd; | |
588 | compat_uint_t time_out; | |
589 | compat_uint_t retry_count; | |
590 | compat_ulong_t uid; | |
591 | compat_ulong_t gid; | |
592 | compat_ulong_t file_mode; | |
593 | compat_ulong_t dir_mode; | |
594 | }; | |
595 | ||
596 | static void *do_ncp_super_data_conv(void *raw_data) | |
597 | { | |
598 | int version = *(unsigned int *)raw_data; | |
599 | ||
600 | if (version == 3) { | |
601 | struct compat_ncp_mount_data *c_n = raw_data; | |
602 | struct ncp_mount_data *n = raw_data; | |
603 | ||
604 | n->dir_mode = c_n->dir_mode; | |
605 | n->file_mode = c_n->file_mode; | |
606 | n->gid = c_n->gid; | |
607 | n->uid = c_n->uid; | |
608 | memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); | |
609 | n->wdog_pid = c_n->wdog_pid; | |
610 | n->mounted_uid = c_n->mounted_uid; | |
611 | } else if (version == 4) { | |
612 | struct compat_ncp_mount_data_v4 *c_n = raw_data; | |
613 | struct ncp_mount_data_v4 *n = raw_data; | |
614 | ||
615 | n->dir_mode = c_n->dir_mode; | |
616 | n->file_mode = c_n->file_mode; | |
617 | n->gid = c_n->gid; | |
618 | n->uid = c_n->uid; | |
619 | n->retry_count = c_n->retry_count; | |
620 | n->time_out = c_n->time_out; | |
621 | n->ncp_fd = c_n->ncp_fd; | |
622 | n->wdog_pid = c_n->wdog_pid; | |
623 | n->mounted_uid = c_n->mounted_uid; | |
624 | n->flags = c_n->flags; | |
625 | } else if (version != 5) { | |
626 | return NULL; | |
627 | } | |
628 | ||
629 | return raw_data; | |
630 | } | |
631 | ||
1da177e4 | 632 | |
9a9947bf DH |
633 | struct compat_nfs_string { |
634 | compat_uint_t len; | |
5fc3e624 | 635 | compat_uptr_t data; |
9a9947bf DH |
636 | }; |
637 | ||
638 | static inline void compat_nfs_string(struct nfs_string *dst, | |
639 | struct compat_nfs_string *src) | |
640 | { | |
641 | dst->data = compat_ptr(src->data); | |
642 | dst->len = src->len; | |
643 | } | |
644 | ||
645 | struct compat_nfs4_mount_data_v1 { | |
646 | compat_int_t version; | |
647 | compat_int_t flags; | |
648 | compat_int_t rsize; | |
649 | compat_int_t wsize; | |
650 | compat_int_t timeo; | |
651 | compat_int_t retrans; | |
652 | compat_int_t acregmin; | |
653 | compat_int_t acregmax; | |
654 | compat_int_t acdirmin; | |
655 | compat_int_t acdirmax; | |
656 | struct compat_nfs_string client_addr; | |
657 | struct compat_nfs_string mnt_path; | |
658 | struct compat_nfs_string hostname; | |
659 | compat_uint_t host_addrlen; | |
5fc3e624 | 660 | compat_uptr_t host_addr; |
9a9947bf DH |
661 | compat_int_t proto; |
662 | compat_int_t auth_flavourlen; | |
5fc3e624 | 663 | compat_uptr_t auth_flavours; |
9a9947bf DH |
664 | }; |
665 | ||
666 | static int do_nfs4_super_data_conv(void *raw_data) | |
667 | { | |
668 | int version = *(compat_uint_t *) raw_data; | |
669 | ||
670 | if (version == 1) { | |
671 | struct compat_nfs4_mount_data_v1 *raw = raw_data; | |
672 | struct nfs4_mount_data *real = raw_data; | |
673 | ||
674 | /* copy the fields backwards */ | |
675 | real->auth_flavours = compat_ptr(raw->auth_flavours); | |
676 | real->auth_flavourlen = raw->auth_flavourlen; | |
677 | real->proto = raw->proto; | |
678 | real->host_addr = compat_ptr(raw->host_addr); | |
679 | real->host_addrlen = raw->host_addrlen; | |
680 | compat_nfs_string(&real->hostname, &raw->hostname); | |
681 | compat_nfs_string(&real->mnt_path, &raw->mnt_path); | |
682 | compat_nfs_string(&real->client_addr, &raw->client_addr); | |
683 | real->acdirmax = raw->acdirmax; | |
684 | real->acdirmin = raw->acdirmin; | |
685 | real->acregmax = raw->acregmax; | |
686 | real->acregmin = raw->acregmin; | |
687 | real->retrans = raw->retrans; | |
688 | real->timeo = raw->timeo; | |
689 | real->wsize = raw->wsize; | |
690 | real->rsize = raw->rsize; | |
691 | real->flags = raw->flags; | |
692 | real->version = raw->version; | |
693 | } | |
9a9947bf DH |
694 | |
695 | return 0; | |
696 | } | |
697 | ||
1da177e4 | 698 | #define NCPFS_NAME "ncpfs" |
9a9947bf | 699 | #define NFS4_NAME "nfs4" |
1da177e4 | 700 | |
932602e2 HC |
701 | COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, |
702 | const char __user *, dir_name, | |
703 | const char __user *, type, compat_ulong_t, flags, | |
704 | const void __user *, data) | |
1da177e4 | 705 | { |
eca6f534 | 706 | char *kernel_type; |
b40ef869 | 707 | void *options; |
eca6f534 | 708 | char *kernel_dev; |
1da177e4 LT |
709 | int retval; |
710 | ||
b8850d1f TG |
711 | kernel_type = copy_mount_string(type); |
712 | retval = PTR_ERR(kernel_type); | |
713 | if (IS_ERR(kernel_type)) | |
1da177e4 LT |
714 | goto out; |
715 | ||
b8850d1f TG |
716 | kernel_dev = copy_mount_string(dev_name); |
717 | retval = PTR_ERR(kernel_dev); | |
718 | if (IS_ERR(kernel_dev)) | |
5e6123f3 | 719 | goto out1; |
1da177e4 | 720 | |
b40ef869 AV |
721 | options = copy_mount_options(data); |
722 | retval = PTR_ERR(options); | |
723 | if (IS_ERR(options)) | |
5e6123f3 | 724 | goto out2; |
1da177e4 | 725 | |
b40ef869 | 726 | if (kernel_type && options) { |
2116b7a4 | 727 | if (!strcmp(kernel_type, NCPFS_NAME)) { |
b40ef869 | 728 | do_ncp_super_data_conv(options); |
eca6f534 | 729 | } else if (!strcmp(kernel_type, NFS4_NAME)) { |
b40ef869 AV |
730 | retval = -EINVAL; |
731 | if (do_nfs4_super_data_conv(options)) | |
5e6123f3 | 732 | goto out3; |
1da177e4 LT |
733 | } |
734 | } | |
735 | ||
b40ef869 | 736 | retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options); |
1da177e4 | 737 | |
1da177e4 | 738 | out3: |
b40ef869 | 739 | kfree(options); |
1da177e4 | 740 | out2: |
5e6123f3 | 741 | kfree(kernel_dev); |
1da177e4 | 742 | out1: |
eca6f534 | 743 | kfree(kernel_type); |
1da177e4 LT |
744 | out: |
745 | return retval; | |
746 | } | |
747 | ||
1da177e4 LT |
748 | struct compat_old_linux_dirent { |
749 | compat_ulong_t d_ino; | |
750 | compat_ulong_t d_offset; | |
751 | unsigned short d_namlen; | |
752 | char d_name[1]; | |
753 | }; | |
754 | ||
755 | struct compat_readdir_callback { | |
5c0ba4e0 | 756 | struct dir_context ctx; |
1da177e4 LT |
757 | struct compat_old_linux_dirent __user *dirent; |
758 | int result; | |
759 | }; | |
760 | ||
ac7576f4 MS |
761 | static int compat_fillonedir(struct dir_context *ctx, const char *name, |
762 | int namlen, loff_t offset, u64 ino, | |
763 | unsigned int d_type) | |
1da177e4 | 764 | { |
ac7576f4 MS |
765 | struct compat_readdir_callback *buf = |
766 | container_of(ctx, struct compat_readdir_callback, ctx); | |
1da177e4 | 767 | struct compat_old_linux_dirent __user *dirent; |
afefdbb2 | 768 | compat_ulong_t d_ino; |
1da177e4 LT |
769 | |
770 | if (buf->result) | |
771 | return -EINVAL; | |
afefdbb2 | 772 | d_ino = ino; |
8f3f655d AV |
773 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
774 | buf->result = -EOVERFLOW; | |
afefdbb2 | 775 | return -EOVERFLOW; |
8f3f655d | 776 | } |
1da177e4 LT |
777 | buf->result++; |
778 | dirent = buf->dirent; | |
779 | if (!access_ok(VERIFY_WRITE, dirent, | |
780 | (unsigned long)(dirent->d_name + namlen + 1) - | |
781 | (unsigned long)dirent)) | |
782 | goto efault; | |
afefdbb2 | 783 | if ( __put_user(d_ino, &dirent->d_ino) || |
1da177e4 LT |
784 | __put_user(offset, &dirent->d_offset) || |
785 | __put_user(namlen, &dirent->d_namlen) || | |
786 | __copy_to_user(dirent->d_name, name, namlen) || | |
787 | __put_user(0, dirent->d_name + namlen)) | |
788 | goto efault; | |
789 | return 0; | |
790 | efault: | |
791 | buf->result = -EFAULT; | |
792 | return -EFAULT; | |
793 | } | |
794 | ||
625b1d7e HC |
795 | COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd, |
796 | struct compat_old_linux_dirent __user *, dirent, unsigned int, count) | |
1da177e4 LT |
797 | { |
798 | int error; | |
63b6df14 | 799 | struct fd f = fdget_pos(fd); |
ac6614b7 AV |
800 | struct compat_readdir_callback buf = { |
801 | .ctx.actor = compat_fillonedir, | |
802 | .dirent = dirent | |
803 | }; | |
1da177e4 | 804 | |
2903ff01 | 805 | if (!f.file) |
863ced7f | 806 | return -EBADF; |
1da177e4 | 807 | |
5c0ba4e0 | 808 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 | 809 | if (buf.result) |
1da177e4 LT |
810 | error = buf.result; |
811 | ||
63b6df14 | 812 | fdput_pos(f); |
1da177e4 LT |
813 | return error; |
814 | } | |
815 | ||
816 | struct compat_linux_dirent { | |
817 | compat_ulong_t d_ino; | |
818 | compat_ulong_t d_off; | |
819 | unsigned short d_reclen; | |
820 | char d_name[1]; | |
821 | }; | |
822 | ||
823 | struct compat_getdents_callback { | |
5c0ba4e0 | 824 | struct dir_context ctx; |
1da177e4 LT |
825 | struct compat_linux_dirent __user *current_dir; |
826 | struct compat_linux_dirent __user *previous; | |
827 | int count; | |
828 | int error; | |
829 | }; | |
830 | ||
ac7576f4 | 831 | static int compat_filldir(struct dir_context *ctx, const char *name, int namlen, |
afefdbb2 | 832 | loff_t offset, u64 ino, unsigned int d_type) |
1da177e4 LT |
833 | { |
834 | struct compat_linux_dirent __user * dirent; | |
ac7576f4 MS |
835 | struct compat_getdents_callback *buf = |
836 | container_of(ctx, struct compat_getdents_callback, ctx); | |
afefdbb2 | 837 | compat_ulong_t d_ino; |
85c9fe8f KW |
838 | int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) + |
839 | namlen + 2, sizeof(compat_long_t)); | |
1da177e4 LT |
840 | |
841 | buf->error = -EINVAL; /* only used if we fail.. */ | |
842 | if (reclen > buf->count) | |
843 | return -EINVAL; | |
afefdbb2 | 844 | d_ino = ino; |
8f3f655d AV |
845 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { |
846 | buf->error = -EOVERFLOW; | |
afefdbb2 | 847 | return -EOVERFLOW; |
8f3f655d | 848 | } |
1da177e4 LT |
849 | dirent = buf->previous; |
850 | if (dirent) { | |
1f60fbe7 TT |
851 | if (signal_pending(current)) |
852 | return -EINTR; | |
1da177e4 LT |
853 | if (__put_user(offset, &dirent->d_off)) |
854 | goto efault; | |
855 | } | |
856 | dirent = buf->current_dir; | |
afefdbb2 | 857 | if (__put_user(d_ino, &dirent->d_ino)) |
1da177e4 LT |
858 | goto efault; |
859 | if (__put_user(reclen, &dirent->d_reclen)) | |
860 | goto efault; | |
861 | if (copy_to_user(dirent->d_name, name, namlen)) | |
862 | goto efault; | |
863 | if (__put_user(0, dirent->d_name + namlen)) | |
864 | goto efault; | |
865 | if (__put_user(d_type, (char __user *) dirent + reclen - 1)) | |
866 | goto efault; | |
867 | buf->previous = dirent; | |
868 | dirent = (void __user *)dirent + reclen; | |
869 | buf->current_dir = dirent; | |
870 | buf->count -= reclen; | |
871 | return 0; | |
872 | efault: | |
873 | buf->error = -EFAULT; | |
874 | return -EFAULT; | |
875 | } | |
876 | ||
625b1d7e HC |
877 | COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd, |
878 | struct compat_linux_dirent __user *, dirent, unsigned int, count) | |
1da177e4 | 879 | { |
2903ff01 | 880 | struct fd f; |
1da177e4 | 881 | struct compat_linux_dirent __user * lastdirent; |
ac6614b7 AV |
882 | struct compat_getdents_callback buf = { |
883 | .ctx.actor = compat_filldir, | |
884 | .current_dir = dirent, | |
885 | .count = count | |
886 | }; | |
1da177e4 LT |
887 | int error; |
888 | ||
1da177e4 | 889 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
863ced7f | 890 | return -EFAULT; |
1da177e4 | 891 | |
63b6df14 | 892 | f = fdget_pos(fd); |
2903ff01 | 893 | if (!f.file) |
863ced7f | 894 | return -EBADF; |
1da177e4 | 895 | |
5c0ba4e0 | 896 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 AV |
897 | if (error >= 0) |
898 | error = buf.error; | |
1da177e4 LT |
899 | lastdirent = buf.previous; |
900 | if (lastdirent) { | |
bb6f619b | 901 | if (put_user(buf.ctx.pos, &lastdirent->d_off)) |
1da177e4 LT |
902 | error = -EFAULT; |
903 | else | |
904 | error = count - buf.count; | |
905 | } | |
63b6df14 | 906 | fdput_pos(f); |
1da177e4 LT |
907 | return error; |
908 | } | |
909 | ||
0473c9b5 | 910 | #ifdef __ARCH_WANT_COMPAT_SYS_GETDENTS64 |
1da177e4 LT |
911 | |
912 | struct compat_getdents_callback64 { | |
5c0ba4e0 | 913 | struct dir_context ctx; |
1da177e4 LT |
914 | struct linux_dirent64 __user *current_dir; |
915 | struct linux_dirent64 __user *previous; | |
916 | int count; | |
917 | int error; | |
918 | }; | |
919 | ||
ac7576f4 MS |
920 | static int compat_filldir64(struct dir_context *ctx, const char *name, |
921 | int namlen, loff_t offset, u64 ino, | |
922 | unsigned int d_type) | |
1da177e4 LT |
923 | { |
924 | struct linux_dirent64 __user *dirent; | |
ac7576f4 MS |
925 | struct compat_getdents_callback64 *buf = |
926 | container_of(ctx, struct compat_getdents_callback64, ctx); | |
85c9fe8f KW |
927 | int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1, |
928 | sizeof(u64)); | |
1da177e4 LT |
929 | u64 off; |
930 | ||
931 | buf->error = -EINVAL; /* only used if we fail.. */ | |
932 | if (reclen > buf->count) | |
933 | return -EINVAL; | |
934 | dirent = buf->previous; | |
935 | ||
936 | if (dirent) { | |
1f60fbe7 TT |
937 | if (signal_pending(current)) |
938 | return -EINTR; | |
1da177e4 LT |
939 | if (__put_user_unaligned(offset, &dirent->d_off)) |
940 | goto efault; | |
941 | } | |
942 | dirent = buf->current_dir; | |
943 | if (__put_user_unaligned(ino, &dirent->d_ino)) | |
944 | goto efault; | |
945 | off = 0; | |
946 | if (__put_user_unaligned(off, &dirent->d_off)) | |
947 | goto efault; | |
948 | if (__put_user(reclen, &dirent->d_reclen)) | |
949 | goto efault; | |
950 | if (__put_user(d_type, &dirent->d_type)) | |
951 | goto efault; | |
952 | if (copy_to_user(dirent->d_name, name, namlen)) | |
953 | goto efault; | |
954 | if (__put_user(0, dirent->d_name + namlen)) | |
955 | goto efault; | |
956 | buf->previous = dirent; | |
957 | dirent = (void __user *)dirent + reclen; | |
958 | buf->current_dir = dirent; | |
959 | buf->count -= reclen; | |
960 | return 0; | |
961 | efault: | |
962 | buf->error = -EFAULT; | |
963 | return -EFAULT; | |
964 | } | |
965 | ||
625b1d7e HC |
966 | COMPAT_SYSCALL_DEFINE3(getdents64, unsigned int, fd, |
967 | struct linux_dirent64 __user *, dirent, unsigned int, count) | |
1da177e4 | 968 | { |
2903ff01 | 969 | struct fd f; |
1da177e4 | 970 | struct linux_dirent64 __user * lastdirent; |
ac6614b7 AV |
971 | struct compat_getdents_callback64 buf = { |
972 | .ctx.actor = compat_filldir64, | |
973 | .current_dir = dirent, | |
974 | .count = count | |
975 | }; | |
1da177e4 LT |
976 | int error; |
977 | ||
1da177e4 | 978 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
863ced7f | 979 | return -EFAULT; |
1da177e4 | 980 | |
63b6df14 | 981 | f = fdget_pos(fd); |
2903ff01 | 982 | if (!f.file) |
863ced7f | 983 | return -EBADF; |
1da177e4 | 984 | |
5c0ba4e0 | 985 | error = iterate_dir(f.file, &buf.ctx); |
53c9c5c0 AV |
986 | if (error >= 0) |
987 | error = buf.error; | |
1da177e4 LT |
988 | lastdirent = buf.previous; |
989 | if (lastdirent) { | |
bb6f619b | 990 | typeof(lastdirent->d_off) d_off = buf.ctx.pos; |
7116e994 | 991 | if (__put_user_unaligned(d_off, &lastdirent->d_off)) |
53c9c5c0 AV |
992 | error = -EFAULT; |
993 | else | |
994 | error = count - buf.count; | |
1da177e4 | 995 | } |
63b6df14 | 996 | fdput_pos(f); |
1da177e4 LT |
997 | return error; |
998 | } | |
0473c9b5 | 999 | #endif /* __ARCH_WANT_COMPAT_SYS_GETDENTS64 */ |
1da177e4 | 1000 | |
e922efc3 MS |
1001 | /* |
1002 | * Exactly like fs/open.c:sys_open(), except that it doesn't set the | |
1003 | * O_LARGEFILE flag. | |
1004 | */ | |
f482e1b4 | 1005 | COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode) |
e922efc3 | 1006 | { |
5590ff0d UD |
1007 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Exactly like fs/open.c:sys_openat(), except that it doesn't set the | |
1012 | * O_LARGEFILE flag. | |
1013 | */ | |
f482e1b4 | 1014 | COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode) |
5590ff0d UD |
1015 | { |
1016 | return do_sys_open(dfd, filename, flags, mode); | |
e922efc3 MS |
1017 | } |
1018 | ||
1da177e4 LT |
1019 | #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
1020 | ||
b773ad40 TG |
1021 | static int poll_select_copy_remaining(struct timespec *end_time, void __user *p, |
1022 | int timeval, int ret) | |
1023 | { | |
1024 | struct timespec ts; | |
1025 | ||
1026 | if (!p) | |
1027 | return ret; | |
1028 | ||
1029 | if (current->personality & STICKY_TIMEOUTS) | |
1030 | goto sticky; | |
1031 | ||
1032 | /* No update for zero timeout */ | |
1033 | if (!end_time->tv_sec && !end_time->tv_nsec) | |
1034 | return ret; | |
1035 | ||
1036 | ktime_get_ts(&ts); | |
1037 | ts = timespec_sub(*end_time, ts); | |
1038 | if (ts.tv_sec < 0) | |
1039 | ts.tv_sec = ts.tv_nsec = 0; | |
1040 | ||
1041 | if (timeval) { | |
1042 | struct compat_timeval rtv; | |
1043 | ||
1044 | rtv.tv_sec = ts.tv_sec; | |
1045 | rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC; | |
1046 | ||
1047 | if (!copy_to_user(p, &rtv, sizeof(rtv))) | |
1048 | return ret; | |
1049 | } else { | |
1050 | struct compat_timespec rts; | |
1051 | ||
1052 | rts.tv_sec = ts.tv_sec; | |
1053 | rts.tv_nsec = ts.tv_nsec; | |
1054 | ||
1055 | if (!copy_to_user(p, &rts, sizeof(rts))) | |
1056 | return ret; | |
1057 | } | |
1058 | /* | |
1059 | * If an application puts its timeval in read-only memory, we | |
1060 | * don't want the Linux-specific update to the timeval to | |
1061 | * cause a fault after the select has completed | |
1062 | * successfully. However, because we're not updating the | |
1063 | * timeval, we can't restart the system call. | |
1064 | */ | |
1065 | ||
1066 | sticky: | |
1067 | if (ret == -ERESTARTNOHAND) | |
1068 | ret = -EINTR; | |
1069 | return ret; | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | /* |
1073 | * Ooo, nasty. We need here to frob 32-bit unsigned longs to | |
1074 | * 64-bit unsigned longs. | |
1075 | */ | |
858119e1 | 1076 | static |
1da177e4 LT |
1077 | int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1078 | unsigned long *fdset) | |
1079 | { | |
022a1692 | 1080 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1da177e4 LT |
1081 | if (ufdset) { |
1082 | unsigned long odd; | |
1083 | ||
1084 | if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) | |
1085 | return -EFAULT; | |
1086 | ||
1087 | odd = nr & 1UL; | |
1088 | nr &= ~1UL; | |
1089 | while (nr) { | |
1090 | unsigned long h, l; | |
7116e994 HC |
1091 | if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) |
1092 | return -EFAULT; | |
1da177e4 LT |
1093 | ufdset += 2; |
1094 | *fdset++ = h << 32 | l; | |
1095 | nr -= 2; | |
1096 | } | |
7116e994 HC |
1097 | if (odd && __get_user(*fdset, ufdset)) |
1098 | return -EFAULT; | |
1da177e4 LT |
1099 | } else { |
1100 | /* Tricky, must clear full unsigned long in the | |
1101 | * kernel fdset at the end, this makes sure that | |
1102 | * actually happens. | |
1103 | */ | |
1104 | memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); | |
1105 | } | |
1106 | return 0; | |
1107 | } | |
1108 | ||
858119e1 | 1109 | static |
7116e994 HC |
1110 | int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
1111 | unsigned long *fdset) | |
1da177e4 LT |
1112 | { |
1113 | unsigned long odd; | |
022a1692 | 1114 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
1da177e4 LT |
1115 | |
1116 | if (!ufdset) | |
7116e994 | 1117 | return 0; |
1da177e4 LT |
1118 | |
1119 | odd = nr & 1UL; | |
1120 | nr &= ~1UL; | |
1121 | while (nr) { | |
1122 | unsigned long h, l; | |
1123 | l = *fdset++; | |
1124 | h = l >> 32; | |
7116e994 HC |
1125 | if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) |
1126 | return -EFAULT; | |
1da177e4 LT |
1127 | ufdset += 2; |
1128 | nr -= 2; | |
1129 | } | |
7116e994 HC |
1130 | if (odd && __put_user(*fdset, ufdset)) |
1131 | return -EFAULT; | |
1132 | return 0; | |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | ||
1136 | /* | |
1137 | * This is a virtual copy of sys_select from fs/select.c and probably | |
1138 | * should be compared to it from time to time | |
1139 | */ | |
1da177e4 LT |
1140 | |
1141 | /* | |
1142 | * We can actually return ERESTARTSYS instead of EINTR, but I'd | |
1143 | * like to be certain this leads to no problems. So I return | |
1144 | * EINTR just for safety. | |
1145 | * | |
1146 | * Update: ERESTARTSYS breaks at least the xview clock binary, so | |
1147 | * I'm trying ERESTARTNOHAND which restart only when you want to. | |
1148 | */ | |
9f72949f | 1149 | int compat_core_sys_select(int n, compat_ulong_t __user *inp, |
8ff3e8e8 AV |
1150 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1151 | struct timespec *end_time) | |
1da177e4 LT |
1152 | { |
1153 | fd_set_bits fds; | |
6087b2da | 1154 | void *bits; |
bbea9f69 | 1155 | int size, max_fds, ret = -EINVAL; |
a4531edd | 1156 | struct fdtable *fdt; |
6087b2da | 1157 | long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; |
1da177e4 | 1158 | |
1da177e4 LT |
1159 | if (n < 0) |
1160 | goto out_nofds; | |
1161 | ||
bbea9f69 | 1162 | /* max_fds can increase, so grab it once to avoid race */ |
ac5b8b6f | 1163 | rcu_read_lock(); |
a4531edd | 1164 | fdt = files_fdtable(current->files); |
bbea9f69 | 1165 | max_fds = fdt->max_fds; |
ac5b8b6f | 1166 | rcu_read_unlock(); |
bbea9f69 VL |
1167 | if (n > max_fds) |
1168 | n = max_fds; | |
1da177e4 LT |
1169 | |
1170 | /* | |
1171 | * We need 6 bitmaps (in/out/ex for both incoming and outgoing), | |
1172 | * since we used fdset we need to allocate memory in units of | |
1173 | * long-words. | |
1174 | */ | |
1da177e4 | 1175 | size = FDS_BYTES(n); |
6087b2da BP |
1176 | bits = stack_fds; |
1177 | if (size > sizeof(stack_fds) / 6) { | |
1178 | bits = kmalloc(6 * size, GFP_KERNEL); | |
1179 | ret = -ENOMEM; | |
1180 | if (!bits) | |
1181 | goto out_nofds; | |
1182 | } | |
1da177e4 LT |
1183 | fds.in = (unsigned long *) bits; |
1184 | fds.out = (unsigned long *) (bits + size); | |
1185 | fds.ex = (unsigned long *) (bits + 2*size); | |
1186 | fds.res_in = (unsigned long *) (bits + 3*size); | |
1187 | fds.res_out = (unsigned long *) (bits + 4*size); | |
1188 | fds.res_ex = (unsigned long *) (bits + 5*size); | |
1189 | ||
1190 | if ((ret = compat_get_fd_set(n, inp, fds.in)) || | |
1191 | (ret = compat_get_fd_set(n, outp, fds.out)) || | |
1192 | (ret = compat_get_fd_set(n, exp, fds.ex))) | |
1193 | goto out; | |
1194 | zero_fd_set(n, fds.res_in); | |
1195 | zero_fd_set(n, fds.res_out); | |
1196 | zero_fd_set(n, fds.res_ex); | |
1197 | ||
8ff3e8e8 | 1198 | ret = do_select(n, &fds, end_time); |
1da177e4 LT |
1199 | |
1200 | if (ret < 0) | |
1201 | goto out; | |
1202 | if (!ret) { | |
1203 | ret = -ERESTARTNOHAND; | |
1204 | if (signal_pending(current)) | |
1205 | goto out; | |
1206 | ret = 0; | |
1207 | } | |
1208 | ||
7116e994 HC |
1209 | if (compat_set_fd_set(n, inp, fds.res_in) || |
1210 | compat_set_fd_set(n, outp, fds.res_out) || | |
1211 | compat_set_fd_set(n, exp, fds.res_ex)) | |
1212 | ret = -EFAULT; | |
1da177e4 | 1213 | out: |
6087b2da BP |
1214 | if (bits != stack_fds) |
1215 | kfree(bits); | |
1da177e4 LT |
1216 | out_nofds: |
1217 | return ret; | |
1218 | } | |
1219 | ||
625b1d7e HC |
1220 | COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp, |
1221 | compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, | |
1222 | struct compat_timeval __user *, tvp) | |
9f72949f | 1223 | { |
8ff3e8e8 | 1224 | struct timespec end_time, *to = NULL; |
9f72949f DW |
1225 | struct compat_timeval tv; |
1226 | int ret; | |
1227 | ||
1228 | if (tvp) { | |
1229 | if (copy_from_user(&tv, tvp, sizeof(tv))) | |
1230 | return -EFAULT; | |
1231 | ||
8ff3e8e8 | 1232 | to = &end_time; |
4d36a9e6 AV |
1233 | if (poll_select_set_timeout(to, |
1234 | tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), | |
1235 | (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) | |
9f72949f | 1236 | return -EINVAL; |
9f72949f DW |
1237 | } |
1238 | ||
8ff3e8e8 AV |
1239 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1240 | ret = poll_select_copy_remaining(&end_time, tvp, 1, ret); | |
9f72949f DW |
1241 | |
1242 | return ret; | |
1243 | } | |
1244 | ||
5d0e5283 CH |
1245 | struct compat_sel_arg_struct { |
1246 | compat_ulong_t n; | |
1247 | compat_uptr_t inp; | |
1248 | compat_uptr_t outp; | |
1249 | compat_uptr_t exp; | |
1250 | compat_uptr_t tvp; | |
1251 | }; | |
1252 | ||
625b1d7e | 1253 | COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg) |
5d0e5283 CH |
1254 | { |
1255 | struct compat_sel_arg_struct a; | |
1256 | ||
1257 | if (copy_from_user(&a, arg, sizeof(a))) | |
1258 | return -EFAULT; | |
1259 | return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), | |
1260 | compat_ptr(a.exp), compat_ptr(a.tvp)); | |
1261 | } | |
1262 | ||
c9da9f21 | 1263 | static long do_compat_pselect(int n, compat_ulong_t __user *inp, |
9f72949f DW |
1264 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
1265 | struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, | |
1266 | compat_size_t sigsetsize) | |
1267 | { | |
1268 | compat_sigset_t ss32; | |
1269 | sigset_t ksigmask, sigsaved; | |
9f72949f | 1270 | struct compat_timespec ts; |
8ff3e8e8 | 1271 | struct timespec end_time, *to = NULL; |
9f72949f DW |
1272 | int ret; |
1273 | ||
1274 | if (tsp) { | |
1275 | if (copy_from_user(&ts, tsp, sizeof(ts))) | |
1276 | return -EFAULT; | |
1277 | ||
8ff3e8e8 AV |
1278 | to = &end_time; |
1279 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) | |
9f72949f DW |
1280 | return -EINVAL; |
1281 | } | |
1282 | ||
1283 | if (sigmask) { | |
1284 | if (sigsetsize != sizeof(compat_sigset_t)) | |
1285 | return -EINVAL; | |
1286 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) | |
1287 | return -EFAULT; | |
1288 | sigset_from_compat(&ksigmask, &ss32); | |
1289 | ||
1290 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1291 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); | |
1292 | } | |
1293 | ||
8ff3e8e8 AV |
1294 | ret = compat_core_sys_select(n, inp, outp, exp, to); |
1295 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); | |
9f72949f DW |
1296 | |
1297 | if (ret == -ERESTARTNOHAND) { | |
1298 | /* | |
1299 | * Don't restore the signal mask yet. Let do_signal() deliver | |
1300 | * the signal on the way back to userspace, before the signal | |
1301 | * mask is restored. | |
1302 | */ | |
1303 | if (sigmask) { | |
1304 | memcpy(¤t->saved_sigmask, &sigsaved, | |
1305 | sizeof(sigsaved)); | |
4e4c22c7 | 1306 | set_restore_sigmask(); |
9f72949f DW |
1307 | } |
1308 | } else if (sigmask) | |
1309 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
1310 | ||
1311 | return ret; | |
1312 | } | |
1313 | ||
625b1d7e HC |
1314 | COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp, |
1315 | compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, | |
1316 | struct compat_timespec __user *, tsp, void __user *, sig) | |
9f72949f DW |
1317 | { |
1318 | compat_size_t sigsetsize = 0; | |
1319 | compat_uptr_t up = 0; | |
1320 | ||
1321 | if (sig) { | |
1322 | if (!access_ok(VERIFY_READ, sig, | |
1323 | sizeof(compat_uptr_t)+sizeof(compat_size_t)) || | |
1324 | __get_user(up, (compat_uptr_t __user *)sig) || | |
1325 | __get_user(sigsetsize, | |
1326 | (compat_size_t __user *)(sig+sizeof(up)))) | |
1327 | return -EFAULT; | |
1328 | } | |
c9da9f21 HC |
1329 | return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up), |
1330 | sigsetsize); | |
9f72949f DW |
1331 | } |
1332 | ||
625b1d7e HC |
1333 | COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, |
1334 | unsigned int, nfds, struct compat_timespec __user *, tsp, | |
1335 | const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize) | |
9f72949f DW |
1336 | { |
1337 | compat_sigset_t ss32; | |
1338 | sigset_t ksigmask, sigsaved; | |
1339 | struct compat_timespec ts; | |
8ff3e8e8 | 1340 | struct timespec end_time, *to = NULL; |
9f72949f DW |
1341 | int ret; |
1342 | ||
1343 | if (tsp) { | |
1344 | if (copy_from_user(&ts, tsp, sizeof(ts))) | |
1345 | return -EFAULT; | |
1346 | ||
8ff3e8e8 AV |
1347 | to = &end_time; |
1348 | if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) | |
1349 | return -EINVAL; | |
9f72949f DW |
1350 | } |
1351 | ||
1352 | if (sigmask) { | |
3835a9bd | 1353 | if (sigsetsize != sizeof(compat_sigset_t)) |
9f72949f DW |
1354 | return -EINVAL; |
1355 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) | |
1356 | return -EFAULT; | |
1357 | sigset_from_compat(&ksigmask, &ss32); | |
1358 | ||
1359 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1360 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); | |
1361 | } | |
1362 | ||
8ff3e8e8 | 1363 | ret = do_sys_poll(ufds, nfds, to); |
9f72949f DW |
1364 | |
1365 | /* We can restart this syscall, usually */ | |
1366 | if (ret == -EINTR) { | |
1367 | /* | |
1368 | * Don't restore the signal mask yet. Let do_signal() deliver | |
1369 | * the signal on the way back to userspace, before the signal | |
1370 | * mask is restored. | |
1371 | */ | |
1372 | if (sigmask) { | |
1373 | memcpy(¤t->saved_sigmask, &sigsaved, | |
1374 | sizeof(sigsaved)); | |
4e4c22c7 | 1375 | set_restore_sigmask(); |
9f72949f DW |
1376 | } |
1377 | ret = -ERESTARTNOHAND; | |
1378 | } else if (sigmask) | |
1379 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
1380 | ||
8ff3e8e8 | 1381 | ret = poll_select_copy_remaining(&end_time, tsp, 0, ret); |
9f72949f DW |
1382 | |
1383 | return ret; | |
1384 | } | |
9f72949f | 1385 | |
becfd1f3 AK |
1386 | #ifdef CONFIG_FHANDLE |
1387 | /* | |
1388 | * Exactly like fs/open.c:sys_open_by_handle_at(), except that it | |
1389 | * doesn't set the O_LARGEFILE flag. | |
1390 | */ | |
f482e1b4 AV |
1391 | COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd, |
1392 | struct file_handle __user *, handle, int, flags) | |
becfd1f3 AK |
1393 | { |
1394 | return do_handle_open(mountdirfd, handle, flags); | |
1395 | } | |
1396 | #endif |