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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: | |
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> |
cbb55092 | 86 | #include <linux/slab.h> |
687ad019 NP |
87 | |
88 | struct oldabi_stat64 { | |
89 | unsigned long long st_dev; | |
90 | unsigned int __pad1; | |
91 | unsigned long __st_ino; | |
92 | unsigned int st_mode; | |
93 | unsigned int st_nlink; | |
94 | ||
95 | unsigned long st_uid; | |
96 | unsigned long st_gid; | |
97 | ||
98 | unsigned long long st_rdev; | |
99 | unsigned int __pad2; | |
100 | ||
101 | long long st_size; | |
102 | unsigned long st_blksize; | |
103 | unsigned long long st_blocks; | |
104 | ||
105 | unsigned long st_atime; | |
106 | unsigned long st_atime_nsec; | |
107 | ||
108 | unsigned long st_mtime; | |
109 | unsigned long st_mtime_nsec; | |
110 | ||
111 | unsigned long st_ctime; | |
112 | unsigned long st_ctime_nsec; | |
113 | ||
114 | unsigned long long st_ino; | |
115 | } __attribute__ ((packed,aligned(4))); | |
116 | ||
117 | static long cp_oldabi_stat64(struct kstat *stat, | |
118 | struct oldabi_stat64 __user *statbuf) | |
119 | { | |
120 | struct oldabi_stat64 tmp; | |
121 | ||
122 | tmp.st_dev = huge_encode_dev(stat->dev); | |
123 | tmp.__pad1 = 0; | |
124 | tmp.__st_ino = stat->ino; | |
125 | tmp.st_mode = stat->mode; | |
126 | tmp.st_nlink = stat->nlink; | |
a7c1938e EB |
127 | tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); |
128 | tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); | |
687ad019 NP |
129 | tmp.st_rdev = huge_encode_dev(stat->rdev); |
130 | tmp.st_size = stat->size; | |
131 | tmp.st_blocks = stat->blocks; | |
132 | tmp.__pad2 = 0; | |
133 | tmp.st_blksize = stat->blksize; | |
134 | tmp.st_atime = stat->atime.tv_sec; | |
135 | tmp.st_atime_nsec = stat->atime.tv_nsec; | |
136 | tmp.st_mtime = stat->mtime.tv_sec; | |
137 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | |
138 | tmp.st_ctime = stat->ctime.tv_sec; | |
139 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | |
140 | tmp.st_ino = stat->ino; | |
141 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | |
142 | } | |
143 | ||
c7887325 | 144 | asmlinkage long sys_oabi_stat64(const char __user * filename, |
687ad019 NP |
145 | struct oldabi_stat64 __user * statbuf) |
146 | { | |
147 | struct kstat stat; | |
148 | int error = vfs_stat(filename, &stat); | |
149 | if (!error) | |
150 | error = cp_oldabi_stat64(&stat, statbuf); | |
151 | return error; | |
152 | } | |
153 | ||
c7887325 | 154 | asmlinkage long sys_oabi_lstat64(const char __user * filename, |
687ad019 NP |
155 | struct oldabi_stat64 __user * statbuf) |
156 | { | |
157 | struct kstat stat; | |
158 | int error = vfs_lstat(filename, &stat); | |
159 | if (!error) | |
160 | error = cp_oldabi_stat64(&stat, statbuf); | |
161 | return error; | |
162 | } | |
163 | ||
164 | asmlinkage long sys_oabi_fstat64(unsigned long fd, | |
165 | struct oldabi_stat64 __user * statbuf) | |
166 | { | |
167 | struct kstat stat; | |
168 | int error = vfs_fstat(fd, &stat); | |
169 | if (!error) | |
170 | error = cp_oldabi_stat64(&stat, statbuf); | |
171 | return error; | |
172 | } | |
173 | ||
c60afe10 | 174 | asmlinkage long sys_oabi_fstatat64(int dfd, |
c7887325 | 175 | const char __user *filename, |
c60afe10 RV |
176 | struct oldabi_stat64 __user *statbuf, |
177 | int flag) | |
178 | { | |
179 | struct kstat stat; | |
0112fc22 | 180 | int error; |
c60afe10 | 181 | |
0112fc22 OD |
182 | error = vfs_fstatat(dfd, filename, &stat, flag); |
183 | if (error) | |
184 | return error; | |
185 | return cp_oldabi_stat64(&stat, statbuf); | |
c60afe10 RV |
186 | } |
187 | ||
687ad019 NP |
188 | struct oabi_flock64 { |
189 | short l_type; | |
190 | short l_whence; | |
191 | loff_t l_start; | |
192 | loff_t l_len; | |
193 | pid_t l_pid; | |
194 | } __attribute__ ((packed,aligned(4))); | |
195 | ||
196 | asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, | |
197 | unsigned long arg) | |
198 | { | |
199 | struct oabi_flock64 user; | |
200 | struct flock64 kernel; | |
201 | mm_segment_t fs = USER_DS; /* initialized to kill a warning */ | |
202 | unsigned long local_arg = arg; | |
203 | int ret; | |
204 | ||
205 | switch (cmd) { | |
0d3f7a2d JL |
206 | case F_OFD_GETLK: |
207 | case F_OFD_SETLK: | |
208 | case F_OFD_SETLKW: | |
687ad019 NP |
209 | case F_GETLK64: |
210 | case F_SETLK64: | |
211 | case F_SETLKW64: | |
212 | if (copy_from_user(&user, (struct oabi_flock64 __user *)arg, | |
213 | sizeof(user))) | |
214 | return -EFAULT; | |
215 | kernel.l_type = user.l_type; | |
216 | kernel.l_whence = user.l_whence; | |
217 | kernel.l_start = user.l_start; | |
218 | kernel.l_len = user.l_len; | |
219 | kernel.l_pid = user.l_pid; | |
220 | local_arg = (unsigned long)&kernel; | |
221 | fs = get_fs(); | |
222 | set_fs(KERNEL_DS); | |
223 | } | |
224 | ||
225 | ret = sys_fcntl64(fd, cmd, local_arg); | |
226 | ||
227 | switch (cmd) { | |
228 | case F_GETLK64: | |
229 | if (!ret) { | |
230 | user.l_type = kernel.l_type; | |
231 | user.l_whence = kernel.l_whence; | |
232 | user.l_start = kernel.l_start; | |
233 | user.l_len = kernel.l_len; | |
234 | user.l_pid = kernel.l_pid; | |
235 | if (copy_to_user((struct oabi_flock64 __user *)arg, | |
236 | &user, sizeof(user))) | |
237 | ret = -EFAULT; | |
238 | } | |
239 | case F_SETLK64: | |
240 | case F_SETLKW64: | |
241 | set_fs(fs); | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | struct oabi_epoll_event { | |
248 | __u32 events; | |
249 | __u64 data; | |
250 | } __attribute__ ((packed,aligned(4))); | |
251 | ||
252 | asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd, | |
253 | struct oabi_epoll_event __user *event) | |
254 | { | |
255 | struct oabi_epoll_event user; | |
256 | struct epoll_event kernel; | |
257 | mm_segment_t fs; | |
258 | long ret; | |
259 | ||
260 | if (op == EPOLL_CTL_DEL) | |
261 | return sys_epoll_ctl(epfd, op, fd, NULL); | |
262 | if (copy_from_user(&user, event, sizeof(user))) | |
263 | return -EFAULT; | |
264 | kernel.events = user.events; | |
265 | kernel.data = user.data; | |
266 | fs = get_fs(); | |
267 | set_fs(KERNEL_DS); | |
268 | ret = sys_epoll_ctl(epfd, op, fd, &kernel); | |
269 | set_fs(fs); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | asmlinkage long sys_oabi_epoll_wait(int epfd, | |
274 | struct oabi_epoll_event __user *events, | |
275 | int maxevents, int timeout) | |
276 | { | |
277 | struct epoll_event *kbuf; | |
278 | mm_segment_t fs; | |
279 | long ret, err, i; | |
280 | ||
281 | if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event))) | |
282 | return -EINVAL; | |
283 | kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL); | |
284 | if (!kbuf) | |
285 | return -ENOMEM; | |
286 | fs = get_fs(); | |
287 | set_fs(KERNEL_DS); | |
288 | ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout); | |
289 | set_fs(fs); | |
290 | err = 0; | |
291 | for (i = 0; i < ret; i++) { | |
292 | __put_user_error(kbuf[i].events, &events->events, err); | |
293 | __put_user_error(kbuf[i].data, &events->data, err); | |
294 | events++; | |
295 | } | |
296 | kfree(kbuf); | |
297 | return err ? -EFAULT : ret; | |
298 | } | |
299 | ||
300 | struct oabi_sembuf { | |
301 | unsigned short sem_num; | |
302 | short sem_op; | |
303 | short sem_flg; | |
304 | unsigned short __pad; | |
305 | }; | |
306 | ||
307 | asmlinkage long sys_oabi_semtimedop(int semid, | |
308 | struct oabi_sembuf __user *tsops, | |
309 | unsigned nsops, | |
310 | const struct timespec __user *timeout) | |
311 | { | |
312 | struct sembuf *sops; | |
313 | struct timespec local_timeout; | |
314 | long err; | |
315 | int i; | |
316 | ||
0f22072a | 317 | if (nsops < 1 || nsops > SEMOPM) |
687ad019 NP |
318 | return -EINVAL; |
319 | sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL); | |
320 | if (!sops) | |
321 | return -ENOMEM; | |
322 | err = 0; | |
323 | for (i = 0; i < nsops; i++) { | |
324 | __get_user_error(sops[i].sem_num, &tsops->sem_num, err); | |
325 | __get_user_error(sops[i].sem_op, &tsops->sem_op, err); | |
326 | __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err); | |
327 | tsops++; | |
328 | } | |
329 | if (timeout) { | |
330 | /* copy this as well before changing domain protection */ | |
331 | err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout)); | |
332 | timeout = &local_timeout; | |
333 | } | |
334 | if (err) { | |
335 | err = -EFAULT; | |
336 | } else { | |
337 | mm_segment_t fs = get_fs(); | |
338 | set_fs(KERNEL_DS); | |
339 | err = sys_semtimedop(semid, sops, nsops, timeout); | |
340 | set_fs(fs); | |
341 | } | |
342 | kfree(sops); | |
343 | return err; | |
344 | } | |
345 | ||
346 | asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops, | |
347 | unsigned nsops) | |
348 | { | |
349 | return sys_oabi_semtimedop(semid, tsops, nsops, NULL); | |
350 | } | |
351 | ||
687ad019 NP |
352 | asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third, |
353 | void __user *ptr, long fifth) | |
354 | { | |
355 | switch (call & 0xffff) { | |
356 | case SEMOP: | |
357 | return sys_oabi_semtimedop(first, | |
358 | (struct oabi_sembuf __user *)ptr, | |
359 | second, NULL); | |
360 | case SEMTIMEDOP: | |
361 | return sys_oabi_semtimedop(first, | |
362 | (struct oabi_sembuf __user *)ptr, | |
363 | second, | |
364 | (const struct timespec __user *)fifth); | |
365 | default: | |
366 | return sys_ipc(call, first, second, third, ptr, fifth); | |
367 | } | |
368 | } | |
99595d02 NP |
369 | |
370 | asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen) | |
371 | { | |
372 | sa_family_t sa_family; | |
373 | if (addrlen == 112 && | |
374 | get_user(sa_family, &addr->sa_family) == 0 && | |
375 | sa_family == AF_UNIX) | |
376 | addrlen = 110; | |
377 | return sys_bind(fd, addr, addrlen); | |
378 | } | |
379 | ||
380 | asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen) | |
381 | { | |
382 | sa_family_t sa_family; | |
383 | if (addrlen == 112 && | |
384 | get_user(sa_family, &addr->sa_family) == 0 && | |
385 | sa_family == AF_UNIX) | |
386 | addrlen = 110; | |
387 | return sys_connect(fd, addr, addrlen); | |
388 | } | |
389 | ||
390 | asmlinkage long sys_oabi_sendto(int fd, void __user *buff, | |
391 | size_t len, unsigned flags, | |
392 | struct sockaddr __user *addr, | |
393 | int addrlen) | |
394 | { | |
395 | sa_family_t sa_family; | |
396 | if (addrlen == 112 && | |
397 | get_user(sa_family, &addr->sa_family) == 0 && | |
398 | sa_family == AF_UNIX) | |
399 | addrlen = 110; | |
400 | return sys_sendto(fd, buff, len, flags, addr, addrlen); | |
401 | } | |
402 | ||
403 | asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) | |
404 | { | |
405 | struct sockaddr __user *addr; | |
406 | int msg_namelen; | |
407 | sa_family_t sa_family; | |
408 | if (msg && | |
409 | get_user(msg_namelen, &msg->msg_namelen) == 0 && | |
410 | msg_namelen == 112 && | |
411 | get_user(addr, &msg->msg_name) == 0 && | |
412 | get_user(sa_family, &addr->sa_family) == 0 && | |
413 | sa_family == AF_UNIX) | |
414 | { | |
415 | /* | |
416 | * HACK ALERT: there is a limit to how much backward bending | |
417 | * we should do for what is actually a transitional | |
418 | * compatibility layer. This already has known flaws with | |
419 | * a few ioctls that we don't intend to fix. Therefore | |
420 | * consider this blatent hack as another one... and take care | |
421 | * to run for cover. In most cases it will "just work fine". | |
422 | * If it doesn't, well, tough. | |
423 | */ | |
424 | put_user(110, &msg->msg_namelen); | |
425 | } | |
426 | return sys_sendmsg(fd, msg, flags); | |
427 | } | |
428 | ||
6c0fa49b NP |
429 | asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args) |
430 | { | |
431 | unsigned long r = -EFAULT, a[6]; | |
432 | ||
433 | switch (call) { | |
434 | case SYS_BIND: | |
435 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
436 | r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]); | |
437 | break; | |
438 | case SYS_CONNECT: | |
439 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
440 | r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]); | |
441 | break; | |
442 | case SYS_SENDTO: | |
443 | if (copy_from_user(a, args, 6 * sizeof(long)) == 0) | |
444 | r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3], | |
445 | (struct sockaddr __user *)a[4], a[5]); | |
446 | break; | |
447 | case SYS_SENDMSG: | |
448 | if (copy_from_user(a, args, 3 * sizeof(long)) == 0) | |
449 | r = sys_oabi_sendmsg(a[0], (struct msghdr __user *)a[1], a[2]); | |
450 | break; | |
451 | default: | |
452 | r = sys_socketcall(call, args); | |
453 | } | |
454 | ||
455 | return r; | |
456 | } |