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