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