Commit | Line | Data |
---|---|---|
687ad019 NP |
1 | /* |
2 | * arch/arm/kernel/sys_oabi-compat.c | |
3 | * | |
4 | * Compatibility wrappers for syscalls that are used from | |
5 | * old ABI user space binaries with an EABI kernel. | |
6 | * | |
7 | * Author: Nicolas Pitre | |
8 | * Created: Oct 7, 2005 | |
9 | * Copyright: MontaVista Software, Inc. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * The legacy ABI and the new ARM EABI have different rules making some | |
18 | * syscalls incompatible especially with structure arguments. | |
19 | * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of | |
20 | * simply word aligned. EABI also pads structures to the size of the largest | |
21 | * member it contains instead of the invariant 32-bit. | |
22 | * | |
23 | * The following syscalls are affected: | |
24 | * | |
25 | * sys_stat64: | |
26 | * sys_lstat64: | |
27 | * sys_fstat64: | |
c60afe10 | 28 | * sys_fstatat64: |
687ad019 NP |
29 | * |
30 | * struct stat64 has different sizes and some members are shifted | |
31 | * Compatibility wrappers are needed for them and provided below. | |
32 | * | |
33 | * sys_fcntl64: | |
34 | * | |
35 | * struct flock64 has different sizes and some members are shifted | |
36 | * A compatibility wrapper is needed and provided below. | |
37 | * | |
38 | * sys_statfs64: | |
39 | * sys_fstatfs64: | |
40 | * | |
41 | * struct statfs64 has extra padding with EABI growing its size from | |
42 | * 84 to 88. This struct is now __attribute__((packed,aligned(4))) | |
43 | * with a small assembly wrapper to force the sz argument to 84 if it is 88 | |
44 | * to avoid copying the extra padding over user space unexpecting it. | |
45 | * | |
46 | * sys_newuname: | |
47 | * | |
48 | * struct new_utsname has no padding with EABI. No problem there. | |
49 | * | |
50 | * sys_epoll_ctl: | |
51 | * sys_epoll_wait: | |
52 | * | |
53 | * struct epoll_event has its second member shifted also affecting the | |
54 | * structure size. Compatibility wrappers are needed and provided below. | |
55 | * | |
56 | * sys_ipc: | |
57 | * sys_semop: | |
58 | * sys_semtimedop: | |
59 | * | |
60 | * struct sembuf loses its padding with EABI. Since arrays of them are | |
61 | * used they have to be copyed to remove the padding. Compatibility wrappers | |
62 | * provided below. | |
99595d02 NP |
63 | * |
64 | * sys_bind: | |
65 | * sys_connect: | |
66 | * sys_sendmsg: | |
67 | * sys_sendto: | |
6c0fa49b | 68 | * sys_socketcall: |
99595d02 NP |
69 | * |
70 | * struct sockaddr_un loses its padding with EABI. Since the size of the | |
71 | * structure is used as a validation test in unix_mkname(), we need to | |
72 | * change the length argument to 110 whenever it is 112. Compatibility | |
73 | * wrappers provided below. | |
687ad019 NP |
74 | */ |
75 | ||
76 | #include <linux/syscalls.h> | |
77 | #include <linux/errno.h> | |
78 | #include <linux/fs.h> | |
79 | #include <linux/fcntl.h> | |
80 | #include <linux/eventpoll.h> | |
81 | #include <linux/sem.h> | |
99595d02 | 82 | #include <linux/socket.h> |
6c0fa49b | 83 | #include <linux/net.h> |
cba4fbbf | 84 | #include <linux/ipc.h> |
33fa9b13 | 85 | #include <linux/uaccess.h> |
687ad019 NP |
86 | |
87 | struct oldabi_stat64 { | |
88 | unsigned long long st_dev; | |
89 | unsigned int __pad1; | |
90 | unsigned long __st_ino; | |
91 | unsigned int st_mode; | |
92 | unsigned int st_nlink; | |
93 | ||
94 | unsigned long st_uid; | |
95 | unsigned long st_gid; | |
96 | ||
97 | unsigned long long st_rdev; | |
98 | unsigned int __pad2; | |
99 | ||
100 | long long st_size; | |
101 | unsigned long st_blksize; | |
102 | unsigned long long st_blocks; | |
103 | ||
104 | unsigned long st_atime; | |
105 | unsigned long st_atime_nsec; | |
106 | ||
107 | unsigned long st_mtime; | |
108 | unsigned long st_mtime_nsec; | |
109 | ||
110 | unsigned long st_ctime; | |
111 | unsigned long st_ctime_nsec; | |
112 | ||
113 | unsigned long long st_ino; | |
114 | } __attribute__ ((packed,aligned(4))); | |
115 | ||
116 | static long cp_oldabi_stat64(struct kstat *stat, | |
117 | struct oldabi_stat64 __user *statbuf) | |
118 | { | |
119 | struct oldabi_stat64 tmp; | |
120 | ||
121 | tmp.st_dev = huge_encode_dev(stat->dev); | |
122 | tmp.__pad1 = 0; | |
123 | tmp.__st_ino = stat->ino; | |
124 | tmp.st_mode = stat->mode; | |
125 | tmp.st_nlink = stat->nlink; | |
126 | tmp.st_uid = stat->uid; | |
127 | tmp.st_gid = stat->gid; | |
128 | tmp.st_rdev = huge_encode_dev(stat->rdev); | |
129 | tmp.st_size = stat->size; | |
130 | tmp.st_blocks = stat->blocks; | |
131 | tmp.__pad2 = 0; | |
132 | tmp.st_blksize = stat->blksize; | |
133 | tmp.st_atime = stat->atime.tv_sec; | |
134 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
135 | tmp.st_mtime = stat->mtime.tv_sec; | |
136 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
137 | tmp.st_ctime = stat->ctime.tv_sec; | |
138 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
139 | tmp.st_ino = stat->ino; | |
140 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
141 | } | |
142 | ||
143 | asmlinkage long sys_oabi_stat64(char __user * filename, | |
144 | struct oldabi_stat64 __user * statbuf) | |
145 | { | |
146 | struct kstat stat; | |
147 | int error = vfs_stat(filename, &stat); | |
148 | if (!error) | |
149 | error = cp_oldabi_stat64(&stat, statbuf); | |
150 | return error; | |
151 | } | |
152 | ||
153 | asmlinkage long sys_oabi_lstat64(char __user * filename, | |
154 | struct oldabi_stat64 __user * statbuf) | |
155 | { | |
156 | struct kstat stat; | |
157 | int error = vfs_lstat(filename, &stat); | |
158 | if (!error) | |
159 | error = cp_oldabi_stat64(&stat, statbuf); | |
160 | return error; | |
161 | } | |
162 | ||
163 | asmlinkage long sys_oabi_fstat64(unsigned long fd, | |
164 | struct oldabi_stat64 __user * statbuf) | |
165 | { | |
166 | struct kstat stat; | |
167 | int error = vfs_fstat(fd, &stat); | |
168 | if (!error) | |
169 | error = cp_oldabi_stat64(&stat, statbuf); | |
170 | return error; | |
171 | } | |
172 | ||
c60afe10 RV |
173 | asmlinkage long sys_oabi_fstatat64(int dfd, |
174 | char __user *filename, | |
175 | struct oldabi_stat64 __user *statbuf, | |
176 | int flag) | |
177 | { | |
178 | struct kstat stat; | |
179 | int error = -EINVAL; | |
180 | ||
181 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) | |
182 | goto out; | |
183 | ||
184 | if (flag & AT_SYMLINK_NOFOLLOW) | |
185 | error = vfs_lstat_fd(dfd, filename, &stat); | |
186 | else | |
187 | error = vfs_stat_fd(dfd, filename, &stat); | |
188 | ||
189 | if (!error) | |
190 | error = cp_oldabi_stat64(&stat, statbuf); | |
191 | ||
192 | out: | |
193 | return error; | |
194 | } | |
195 | ||
687ad019 NP |
196 | struct oabi_flock64 { |
197 | short l_type; | |
198 | short l_whence; | |
199 | loff_t l_start; | |
200 | loff_t l_len; | |
201 | pid_t l_pid; | |
202 | } __attribute__ ((packed,aligned(4))); | |
203 | ||
204 | asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, | |
205 | unsigned long arg) | |
206 | { | |
207 | struct oabi_flock64 user; | |
208 | struct flock64 kernel; | |
209 | mm_segment_t fs = USER_DS; /* initialized to kill a warning */ | |
210 | unsigned long local_arg = arg; | |
211 | int ret; | |
212 | ||
213 | switch (cmd) { | |
214 | case F_GETLK64: | |
215 | case F_SETLK64: | |
216 | case F_SETLKW64: | |
217 | if (copy_from_user(&user, (struct oabi_flock64 __user *)arg, | |
218 | sizeof(user))) | |
219 | return -EFAULT; | |
220 | kernel.l_type = user.l_type; | |
221 | kernel.l_whence = user.l_whence; | |
222 | kernel.l_start = user.l_start; | |
223 | kernel.l_len = user.l_len; | |
224 | kernel.l_pid = user.l_pid; | |
225 | local_arg = (unsigned long)&kernel; | |
226 | fs = get_fs(); | |
227 | set_fs(KERNEL_DS); | |
228 | } | |
229 | ||
230 | ret = sys_fcntl64(fd, cmd, local_arg); | |
231 | ||
232 | switch (cmd) { | |
233 | case F_GETLK64: | |
234 | if (!ret) { | |
235 | user.l_type = kernel.l_type; | |
236 | user.l_whence = kernel.l_whence; | |
237 | user.l_start = kernel.l_start; | |
238 | user.l_len = kernel.l_len; | |
239 | user.l_pid = kernel.l_pid; | |
240 | if (copy_to_user((struct oabi_flock64 __user *)arg, | |
241 | &user, sizeof(user))) | |
242 | ret = -EFAULT; | |
243 | } | |
244 | case F_SETLK64: | |
245 | case F_SETLKW64: | |
246 | set_fs(fs); | |
247 | } | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | struct oabi_epoll_event { | |
253 | __u32 events; | |
254 | __u64 data; | |
255 | } __attribute__ ((packed,aligned(4))); | |
256 | ||
257 | asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd, | |
258 | struct oabi_epoll_event __user *event) | |
259 | { | |
260 | struct oabi_epoll_event user; | |
261 | struct epoll_event kernel; | |
262 | mm_segment_t fs; | |
263 | long ret; | |
264 | ||
265 | if (op == EPOLL_CTL_DEL) | |
266 | return sys_epoll_ctl(epfd, op, fd, NULL); | |
267 | if (copy_from_user(&user, event, sizeof(user))) | |
268 | return -EFAULT; | |
269 | kernel.events = user.events; | |
270 | kernel.data = user.data; | |
271 | fs = get_fs(); | |
272 | set_fs(KERNEL_DS); | |
273 | ret = sys_epoll_ctl(epfd, op, fd, &kernel); | |
274 | set_fs(fs); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | asmlinkage long sys_oabi_epoll_wait(int epfd, | |
279 | struct oabi_epoll_event __user *events, | |
280 | int maxevents, int timeout) | |
281 | { | |
282 | struct epoll_event *kbuf; | |
283 | mm_segment_t fs; | |
284 | long ret, err, i; | |
285 | ||
286 | if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event))) | |
287 | return -EINVAL; | |
288 | kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL); | |
289 | if (!kbuf) | |
290 | return -ENOMEM; | |
291 | fs = get_fs(); | |
292 | set_fs(KERNEL_DS); | |
293 | ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout); | |
294 | set_fs(fs); | |
295 | err = 0; | |
296 | for (i = 0; i < ret; i++) { | |
297 | __put_user_error(kbuf[i].events, &events->events, err); | |
298 | __put_user_error(kbuf[i].data, &events->data, err); | |
299 | events++; | |
300 | } | |
301 | kfree(kbuf); | |
302 | return err ? -EFAULT : ret; | |
303 | } | |
304 | ||
305 | struct oabi_sembuf { | |
306 | unsigned short sem_num; | |
307 | short sem_op; | |
308 | short sem_flg; | |
309 | unsigned short __pad; | |
310 | }; | |
311 | ||
312 | asmlinkage long sys_oabi_semtimedop(int semid, | |
313 | struct oabi_sembuf __user *tsops, | |
314 | unsigned nsops, | |
315 | const struct timespec __user *timeout) | |
316 | { | |
317 | struct sembuf *sops; | |
318 | struct timespec local_timeout; | |
319 | long err; | |
320 | int i; | |
321 | ||
322 | if (nsops < 1) | |
323 | return -EINVAL; | |
324 | sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL); | |
325 | if (!sops) | |
326 | return -ENOMEM; | |
327 | err = 0; | |
328 | for (i = 0; i < nsops; i++) { | |
329 | __get_user_error(sops[i].sem_num, &tsops->sem_num, err); | |
330 | __get_user_error(sops[i].sem_op, &tsops->sem_op, err); | |
331 | __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err); | |
332 | tsops++; | |
333 | } | |
334 | if (timeout) { | |
335 | /* copy this as well before changing domain protection */ | |
336 | err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout)); | |
337 | timeout = &local_timeout; | |
338 | } | |
339 | if (err) { | |
340 | err = -EFAULT; | |
341 | } else { | |
342 | mm_segment_t fs = get_fs(); | |
343 | set_fs(KERNEL_DS); | |
344 | err = sys_semtimedop(semid, sops, nsops, timeout); | |
345 | set_fs(fs); | |
346 | } | |
347 | kfree(sops); | |
348 | return err; | |
349 | } | |
350 | ||
351 | asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops, | |
352 | unsigned nsops) | |
353 | { | |
354 | return sys_oabi_semtimedop(semid, tsops, nsops, NULL); | |
355 | } | |
356 | ||
357 | extern asmlinkage int sys_ipc(uint call, int first, int second, int third, | |
358 | void __user *ptr, long fifth); | |
359 | ||
360 | asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third, | |
361 | void __user *ptr, long fifth) | |
362 | { | |
363 | switch (call & 0xffff) { | |
364 | case SEMOP: | |
365 | return sys_oabi_semtimedop(first, | |
366 | (struct oabi_sembuf __user *)ptr, | |
367 | second, NULL); | |
368 | case SEMTIMEDOP: | |
369 | return sys_oabi_semtimedop(first, | |
370 | (struct oabi_sembuf __user *)ptr, | |
371 | second, | |
372 | (const struct timespec __user *)fifth); | |
373 | default: | |
374 | return sys_ipc(call, first, second, third, ptr, fifth); | |
375 | } | |
376 | } | |
99595d02 NP |
377 | |
378 | asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen) | |
379 | { | |
380 | sa_family_t sa_family; | |
381 | if (addrlen == 112 && | |
382 | get_user(sa_family, &addr->sa_family) == 0 && | |
383 | sa_family == AF_UNIX) | |
384 | addrlen = 110; | |
385 | return sys_bind(fd, addr, addrlen); | |
386 | } | |
387 | ||
388 | asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen) | |
389 | { | |
390 | sa_family_t sa_family; | |
391 | if (addrlen == 112 && | |
392 | get_user(sa_family, &addr->sa_family) == 0 && | |
393 | sa_family == AF_UNIX) | |
394 | addrlen = 110; | |
395 | return sys_connect(fd, addr, addrlen); | |
396 | } | |
397 | ||
398 | asmlinkage long sys_oabi_sendto(int fd, void __user *buff, | |
399 | size_t len, unsigned flags, | |
400 | struct sockaddr __user *addr, | |
401 | int addrlen) | |
402 | { | |
403 | sa_family_t sa_family; | |
404 | if (addrlen == 112 && | |
405 | get_user(sa_family, &addr->sa_family) == 0 && | |
406 | sa_family == AF_UNIX) | |
407 | addrlen = 110; | |
408 | return sys_sendto(fd, buff, len, flags, addr, addrlen); | |
409 | } | |
410 | ||
411 | asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
412 | { | |
413 | struct sockaddr __user *addr; | |
414 | int msg_namelen; | |
415 | sa_family_t sa_family; | |
416 | if (msg && | |
417 | get_user(msg_namelen, &msg->msg_namelen) == 0 && | |
418 | msg_namelen == 112 && | |
419 | get_user(addr, &msg->msg_name) == 0 && | |
420 | get_user(sa_family, &addr->sa_family) == 0 && | |
421 | sa_family == AF_UNIX) | |
422 | { | |
423 | /* | |
424 | * HACK ALERT: there is a limit to how much backward bending | |
425 | * we should do for what is actually a transitional | |
426 | * compatibility layer. This already has known flaws with | |
427 | * a few ioctls that we don't intend to fix. Therefore | |
428 | * consider this blatent hack as another one... and take care | |
429 | * to run for cover. In most cases it will "just work fine". | |
430 | * If it doesn't, well, tough. | |
431 | */ | |
432 | put_user(110, &msg->msg_namelen); | |
433 | } | |
434 | return sys_sendmsg(fd, msg, flags); | |
435 | } | |
436 | ||
6c0fa49b NP |
437 | asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args) |
438 | { | |
439 | unsigned long r = -EFAULT, a[6]; | |
440 | ||
441 | switch (call) { | |
442 | case SYS_BIND: | |
443 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
444 | r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]); | |
445 | break; | |
446 | case SYS_CONNECT: | |
447 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
448 | r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]); | |
449 | break; | |
450 | case SYS_SENDTO: | |
451 | if (copy_from_user(a, args, 6 * sizeof(long)) == 0) | |
452 | r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3], | |
453 | (struct sockaddr __user *)a[4], a[5]); | |
454 | break; | |
455 | case SYS_SENDMSG: | |
456 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
457 | r = sys_oabi_sendmsg(a[0], (struct msghdr __user *)a[1], a[2]); | |
458 | break; | |
459 | default: | |
460 | r = sys_socketcall(call, args); | |
461 | } | |
462 | ||
463 | return r; | |
464 | } |