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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 * sys_fstatat64:
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.
63 *
64 * sys_bind:
65 * sys_connect:
66 * sys_sendmsg:
67 * sys_sendto:
68 * sys_socketcall:
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.
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>
82#include <linux/socket.h>
83#include <linux/net.h>
84#include <linux/ipc.h>
85#include <linux/uaccess.h>
86#include <linux/slab.h>
87
88struct 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
117static 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;
127 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
128 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
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
144asmlinkage long sys_oabi_stat64(const char __user * filename,
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
154asmlinkage long sys_oabi_lstat64(const char __user * filename,
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
164asmlinkage 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
174asmlinkage long sys_oabi_fstatat64(int dfd,
175 const char __user *filename,
176 struct oldabi_stat64 __user *statbuf,
177 int flag)
178{
179 struct kstat stat;
180 int error;
181
182 error = vfs_fstatat(dfd, filename, &stat, flag);
183 if (error)
184 return error;
185 return cp_oldabi_stat64(&stat, statbuf);
186}
187
188struct 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
196asmlinkage 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) {
206 case F_OFD_GETLK:
207 case F_OFD_SETLK:
208 case F_OFD_SETLKW:
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
247struct oabi_epoll_event {
248 __u32 events;
249 __u64 data;
250} __attribute__ ((packed,aligned(4)));
251
252asmlinkage 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
273asmlinkage 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
300struct oabi_sembuf {
301 unsigned short sem_num;
302 short sem_op;
303 short sem_flg;
304 unsigned short __pad;
305};
306
307asmlinkage 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
317 if (nsops < 1 || nsops > SEMOPM)
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
346asmlinkage 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
352asmlinkage 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}
369
370asmlinkage 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
380asmlinkage 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
390asmlinkage 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
403asmlinkage 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
429asmlinkage 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}
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 * sys_fstatat64:
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.
63 *
64 * sys_bind:
65 * sys_connect:
66 * sys_sendmsg:
67 * sys_sendto:
68 * sys_socketcall:
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.
74 */
75
76#include <linux/syscalls.h>
77#include <linux/errno.h>
78#include <linux/fs.h>
79#include <linux/cred.h>
80#include <linux/fcntl.h>
81#include <linux/eventpoll.h>
82#include <linux/sem.h>
83#include <linux/socket.h>
84#include <linux/net.h>
85#include <linux/ipc.h>
86#include <linux/uaccess.h>
87#include <linux/slab.h>
88
89struct oldabi_stat64 {
90 unsigned long long st_dev;
91 unsigned int __pad1;
92 unsigned long __st_ino;
93 unsigned int st_mode;
94 unsigned int st_nlink;
95
96 unsigned long st_uid;
97 unsigned long st_gid;
98
99 unsigned long long st_rdev;
100 unsigned int __pad2;
101
102 long long st_size;
103 unsigned long st_blksize;
104 unsigned long long st_blocks;
105
106 unsigned long st_atime;
107 unsigned long st_atime_nsec;
108
109 unsigned long st_mtime;
110 unsigned long st_mtime_nsec;
111
112 unsigned long st_ctime;
113 unsigned long st_ctime_nsec;
114
115 unsigned long long st_ino;
116} __attribute__ ((packed,aligned(4)));
117
118static long cp_oldabi_stat64(struct kstat *stat,
119 struct oldabi_stat64 __user *statbuf)
120{
121 struct oldabi_stat64 tmp;
122
123 tmp.st_dev = huge_encode_dev(stat->dev);
124 tmp.__pad1 = 0;
125 tmp.__st_ino = stat->ino;
126 tmp.st_mode = stat->mode;
127 tmp.st_nlink = stat->nlink;
128 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
129 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
130 tmp.st_rdev = huge_encode_dev(stat->rdev);
131 tmp.st_size = stat->size;
132 tmp.st_blocks = stat->blocks;
133 tmp.__pad2 = 0;
134 tmp.st_blksize = stat->blksize;
135 tmp.st_atime = stat->atime.tv_sec;
136 tmp.st_atime_nsec = stat->atime.tv_nsec;
137 tmp.st_mtime = stat->mtime.tv_sec;
138 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
139 tmp.st_ctime = stat->ctime.tv_sec;
140 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
141 tmp.st_ino = stat->ino;
142 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
143}
144
145asmlinkage long sys_oabi_stat64(const char __user * filename,
146 struct oldabi_stat64 __user * statbuf)
147{
148 struct kstat stat;
149 int error = vfs_stat(filename, &stat);
150 if (!error)
151 error = cp_oldabi_stat64(&stat, statbuf);
152 return error;
153}
154
155asmlinkage long sys_oabi_lstat64(const char __user * filename,
156 struct oldabi_stat64 __user * statbuf)
157{
158 struct kstat stat;
159 int error = vfs_lstat(filename, &stat);
160 if (!error)
161 error = cp_oldabi_stat64(&stat, statbuf);
162 return error;
163}
164
165asmlinkage long sys_oabi_fstat64(unsigned long fd,
166 struct oldabi_stat64 __user * statbuf)
167{
168 struct kstat stat;
169 int error = vfs_fstat(fd, &stat);
170 if (!error)
171 error = cp_oldabi_stat64(&stat, statbuf);
172 return error;
173}
174
175asmlinkage long sys_oabi_fstatat64(int dfd,
176 const char __user *filename,
177 struct oldabi_stat64 __user *statbuf,
178 int flag)
179{
180 struct kstat stat;
181 int error;
182
183 error = vfs_fstatat(dfd, filename, &stat, flag);
184 if (error)
185 return error;
186 return cp_oldabi_stat64(&stat, statbuf);
187}
188
189struct oabi_flock64 {
190 short l_type;
191 short l_whence;
192 loff_t l_start;
193 loff_t l_len;
194 pid_t l_pid;
195} __attribute__ ((packed,aligned(4)));
196
197static long do_locks(unsigned int fd, unsigned int cmd,
198 unsigned long arg)
199{
200 struct flock64 kernel;
201 struct oabi_flock64 user;
202 mm_segment_t fs;
203 long ret;
204
205 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
206 sizeof(user)))
207 return -EFAULT;
208 kernel.l_type = user.l_type;
209 kernel.l_whence = user.l_whence;
210 kernel.l_start = user.l_start;
211 kernel.l_len = user.l_len;
212 kernel.l_pid = user.l_pid;
213
214 fs = get_fs();
215 set_fs(KERNEL_DS);
216 ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel);
217 set_fs(fs);
218
219 if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) {
220 user.l_type = kernel.l_type;
221 user.l_whence = kernel.l_whence;
222 user.l_start = kernel.l_start;
223 user.l_len = kernel.l_len;
224 user.l_pid = kernel.l_pid;
225 if (copy_to_user((struct oabi_flock64 __user *)arg,
226 &user, sizeof(user)))
227 ret = -EFAULT;
228 }
229 return ret;
230}
231
232asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
233 unsigned long arg)
234{
235 switch (cmd) {
236 case F_OFD_GETLK:
237 case F_OFD_SETLK:
238 case F_OFD_SETLKW:
239 case F_GETLK64:
240 case F_SETLK64:
241 case F_SETLKW64:
242 return do_locks(fd, cmd, arg);
243
244 default:
245 return sys_fcntl64(fd, cmd, arg);
246 }
247}
248
249struct oabi_epoll_event {
250 __u32 events;
251 __u64 data;
252} __attribute__ ((packed,aligned(4)));
253
254asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
255 struct oabi_epoll_event __user *event)
256{
257 struct oabi_epoll_event user;
258 struct epoll_event kernel;
259 mm_segment_t fs;
260 long ret;
261
262 if (op == EPOLL_CTL_DEL)
263 return sys_epoll_ctl(epfd, op, fd, NULL);
264 if (copy_from_user(&user, event, sizeof(user)))
265 return -EFAULT;
266 kernel.events = user.events;
267 kernel.data = user.data;
268 fs = get_fs();
269 set_fs(KERNEL_DS);
270 ret = sys_epoll_ctl(epfd, op, fd, &kernel);
271 set_fs(fs);
272 return ret;
273}
274
275asmlinkage long sys_oabi_epoll_wait(int epfd,
276 struct oabi_epoll_event __user *events,
277 int maxevents, int timeout)
278{
279 struct epoll_event *kbuf;
280 mm_segment_t fs;
281 long ret, err, i;
282
283 if (maxevents <= 0 ||
284 maxevents > (INT_MAX/sizeof(*kbuf)) ||
285 maxevents > (INT_MAX/sizeof(*events)))
286 return -EINVAL;
287 if (!access_ok(VERIFY_WRITE, events, sizeof(*events) * maxevents))
288 return -EFAULT;
289 kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
290 if (!kbuf)
291 return -ENOMEM;
292 fs = get_fs();
293 set_fs(KERNEL_DS);
294 ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
295 set_fs(fs);
296 err = 0;
297 for (i = 0; i < ret; i++) {
298 __put_user_error(kbuf[i].events, &events->events, err);
299 __put_user_error(kbuf[i].data, &events->data, err);
300 events++;
301 }
302 kfree(kbuf);
303 return err ? -EFAULT : ret;
304}
305
306struct oabi_sembuf {
307 unsigned short sem_num;
308 short sem_op;
309 short sem_flg;
310 unsigned short __pad;
311};
312
313asmlinkage long sys_oabi_semtimedop(int semid,
314 struct oabi_sembuf __user *tsops,
315 unsigned nsops,
316 const struct timespec __user *timeout)
317{
318 struct sembuf *sops;
319 struct timespec local_timeout;
320 long err;
321 int i;
322
323 if (nsops < 1 || nsops > SEMOPM)
324 return -EINVAL;
325 if (!access_ok(VERIFY_READ, tsops, sizeof(*tsops) * nsops))
326 return -EFAULT;
327 sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
328 if (!sops)
329 return -ENOMEM;
330 err = 0;
331 for (i = 0; i < nsops; i++) {
332 __get_user_error(sops[i].sem_num, &tsops->sem_num, err);
333 __get_user_error(sops[i].sem_op, &tsops->sem_op, err);
334 __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
335 tsops++;
336 }
337 if (timeout) {
338 /* copy this as well before changing domain protection */
339 err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
340 timeout = &local_timeout;
341 }
342 if (err) {
343 err = -EFAULT;
344 } else {
345 mm_segment_t fs = get_fs();
346 set_fs(KERNEL_DS);
347 err = sys_semtimedop(semid, sops, nsops, timeout);
348 set_fs(fs);
349 }
350 kfree(sops);
351 return err;
352}
353
354asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
355 unsigned nsops)
356{
357 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
358}
359
360asmlinkage 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}
377
378asmlinkage 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
388asmlinkage 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
398asmlinkage 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
411asmlinkage long sys_oabi_sendmsg(int fd, struct user_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
437asmlinkage 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 user_msghdr __user *)a[1], a[2]);
458 break;
459 default:
460 r = sys_socketcall(call, args);
461 }
462
463 return r;
464}