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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/kernel/sys_oabi-compat.c
4 *
5 * Compatibility wrappers for syscalls that are used from
6 * old ABI user space binaries with an EABI kernel.
7 *
8 * Author: Nicolas Pitre
9 * Created: Oct 7, 2005
10 * Copyright: MontaVista Software, Inc.
11 */
12
13#include <asm/syscalls.h>
14
15/*
16 * The legacy ABI and the new ARM EABI have different rules making some
17 * syscalls incompatible especially with structure arguments.
18 * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
19 * simply word aligned. EABI also pads structures to the size of the largest
20 * member it contains instead of the invariant 32-bit.
21 *
22 * The following syscalls are affected:
23 *
24 * sys_stat64:
25 * sys_lstat64:
26 * sys_fstat64:
27 * sys_fstatat64:
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.
62 *
63 * sys_bind:
64 * sys_connect:
65 * sys_sendmsg:
66 * sys_sendto:
67 * sys_socketcall:
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.
73 */
74
75#include <linux/syscalls.h>
76#include <linux/errno.h>
77#include <linux/fs.h>
78#include <linux/filelock.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/ipc_namespace.h>
87#include <linux/uaccess.h>
88#include <linux/slab.h>
89
90#include <asm/syscall.h>
91
92struct oldabi_stat64 {
93 unsigned long long st_dev;
94 unsigned int __pad1;
95 unsigned long __st_ino;
96 unsigned int st_mode;
97 unsigned int st_nlink;
98
99 unsigned long st_uid;
100 unsigned long st_gid;
101
102 unsigned long long st_rdev;
103 unsigned int __pad2;
104
105 long long st_size;
106 unsigned long st_blksize;
107 unsigned long long st_blocks;
108
109 unsigned long st_atime;
110 unsigned long st_atime_nsec;
111
112 unsigned long st_mtime;
113 unsigned long st_mtime_nsec;
114
115 unsigned long st_ctime;
116 unsigned long st_ctime_nsec;
117
118 unsigned long long st_ino;
119} __attribute__ ((packed,aligned(4)));
120
121static long cp_oldabi_stat64(struct kstat *stat,
122 struct oldabi_stat64 __user *statbuf)
123{
124 struct oldabi_stat64 tmp;
125
126 tmp.st_dev = huge_encode_dev(stat->dev);
127 tmp.__pad1 = 0;
128 tmp.__st_ino = stat->ino;
129 tmp.st_mode = stat->mode;
130 tmp.st_nlink = stat->nlink;
131 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
132 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
133 tmp.st_rdev = huge_encode_dev(stat->rdev);
134 tmp.st_size = stat->size;
135 tmp.st_blocks = stat->blocks;
136 tmp.__pad2 = 0;
137 tmp.st_blksize = stat->blksize;
138 tmp.st_atime = stat->atime.tv_sec;
139 tmp.st_atime_nsec = stat->atime.tv_nsec;
140 tmp.st_mtime = stat->mtime.tv_sec;
141 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
142 tmp.st_ctime = stat->ctime.tv_sec;
143 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
144 tmp.st_ino = stat->ino;
145 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
146}
147
148asmlinkage long sys_oabi_stat64(const char __user * filename,
149 struct oldabi_stat64 __user * statbuf)
150{
151 struct kstat stat;
152 int error = vfs_stat(filename, &stat);
153 if (!error)
154 error = cp_oldabi_stat64(&stat, statbuf);
155 return error;
156}
157
158asmlinkage long sys_oabi_lstat64(const char __user * filename,
159 struct oldabi_stat64 __user * statbuf)
160{
161 struct kstat stat;
162 int error = vfs_lstat(filename, &stat);
163 if (!error)
164 error = cp_oldabi_stat64(&stat, statbuf);
165 return error;
166}
167
168asmlinkage long sys_oabi_fstat64(unsigned long fd,
169 struct oldabi_stat64 __user * statbuf)
170{
171 struct kstat stat;
172 int error = vfs_fstat(fd, &stat);
173 if (!error)
174 error = cp_oldabi_stat64(&stat, statbuf);
175 return error;
176}
177
178asmlinkage long sys_oabi_fstatat64(int dfd,
179 const char __user *filename,
180 struct oldabi_stat64 __user *statbuf,
181 int flag)
182{
183 struct kstat stat;
184 int error;
185
186 error = vfs_fstatat(dfd, filename, &stat, flag);
187 if (error)
188 return error;
189 return cp_oldabi_stat64(&stat, statbuf);
190}
191
192struct oabi_flock64 {
193 short l_type;
194 short l_whence;
195 loff_t l_start;
196 loff_t l_len;
197 pid_t l_pid;
198} __attribute__ ((packed,aligned(4)));
199
200static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
201{
202 struct oabi_flock64 user;
203
204 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
205 sizeof(user)))
206 return -EFAULT;
207
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 return 0;
215}
216
217static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
218{
219 struct oabi_flock64 user;
220
221 user.l_type = kernel->l_type;
222 user.l_whence = kernel->l_whence;
223 user.l_start = kernel->l_start;
224 user.l_len = kernel->l_len;
225 user.l_pid = kernel->l_pid;
226
227 if (copy_to_user((struct oabi_flock64 __user *)arg,
228 &user, sizeof(user)))
229 return -EFAULT;
230
231 return 0;
232}
233
234asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
235 unsigned long arg)
236{
237 void __user *argp = (void __user *)arg;
238 CLASS(fd_raw, f)(fd);
239 struct flock64 flock;
240 long err;
241
242 if (fd_empty(f))
243 return -EBADF;
244
245 switch (cmd) {
246 case F_GETLK64:
247 case F_OFD_GETLK:
248 err = security_file_fcntl(fd_file(f), cmd, arg);
249 if (err)
250 break;
251 err = get_oabi_flock(&flock, argp);
252 if (err)
253 break;
254 err = fcntl_getlk64(fd_file(f), cmd, &flock);
255 if (!err)
256 err = put_oabi_flock(&flock, argp);
257 break;
258 case F_SETLK64:
259 case F_SETLKW64:
260 case F_OFD_SETLK:
261 case F_OFD_SETLKW:
262 err = security_file_fcntl(fd_file(f), cmd, arg);
263 if (err)
264 break;
265 err = get_oabi_flock(&flock, argp);
266 if (err)
267 break;
268 err = fcntl_setlk64(fd, fd_file(f), cmd, &flock);
269 break;
270 default:
271 err = sys_fcntl64(fd, cmd, arg);
272 break;
273 }
274 return err;
275}
276
277struct oabi_epoll_event {
278 __poll_t events;
279 __u64 data;
280} __attribute__ ((packed,aligned(4)));
281
282#ifdef CONFIG_EPOLL
283asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
284 struct oabi_epoll_event __user *event)
285{
286 struct oabi_epoll_event user;
287 struct epoll_event kernel;
288
289 if (ep_op_has_event(op) &&
290 copy_from_user(&user, event, sizeof(user)))
291 return -EFAULT;
292
293 kernel.events = user.events;
294 kernel.data = user.data;
295
296 return do_epoll_ctl(epfd, op, fd, &kernel, false);
297}
298#else
299asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
300 struct oabi_epoll_event __user *event)
301{
302 return -EINVAL;
303}
304#endif
305
306struct epoll_event __user *
307epoll_put_uevent(__poll_t revents, __u64 data,
308 struct epoll_event __user *uevent)
309{
310 if (in_oabi_syscall()) {
311 struct oabi_epoll_event __user *oevent = (void __user *)uevent;
312
313 if (__put_user(revents, &oevent->events) ||
314 __put_user(data, &oevent->data))
315 return NULL;
316
317 return (void __user *)(oevent+1);
318 }
319
320 if (__put_user(revents, &uevent->events) ||
321 __put_user(data, &uevent->data))
322 return NULL;
323
324 return uevent+1;
325}
326
327struct oabi_sembuf {
328 unsigned short sem_num;
329 short sem_op;
330 short sem_flg;
331 unsigned short __pad;
332};
333
334#define sc_semopm sem_ctls[2]
335
336#ifdef CONFIG_SYSVIPC
337asmlinkage long sys_oabi_semtimedop(int semid,
338 struct oabi_sembuf __user *tsops,
339 unsigned nsops,
340 const struct old_timespec32 __user *timeout)
341{
342 struct ipc_namespace *ns;
343 struct sembuf *sops;
344 long err;
345 int i;
346
347 ns = current->nsproxy->ipc_ns;
348 if (nsops > ns->sc_semopm)
349 return -E2BIG;
350 if (nsops < 1 || nsops > SEMOPM)
351 return -EINVAL;
352 sops = kvmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
353 if (!sops)
354 return -ENOMEM;
355 err = 0;
356 for (i = 0; i < nsops; i++) {
357 struct oabi_sembuf osb;
358 err |= copy_from_user(&osb, tsops, sizeof(osb));
359 sops[i].sem_num = osb.sem_num;
360 sops[i].sem_op = osb.sem_op;
361 sops[i].sem_flg = osb.sem_flg;
362 tsops++;
363 }
364 if (err) {
365 err = -EFAULT;
366 goto out;
367 }
368
369 if (timeout) {
370 struct timespec64 ts;
371 err = get_old_timespec32(&ts, timeout);
372 if (err)
373 goto out;
374 err = __do_semtimedop(semid, sops, nsops, &ts, ns);
375 goto out;
376 }
377 err = __do_semtimedop(semid, sops, nsops, NULL, ns);
378out:
379 kvfree(sops);
380 return err;
381}
382
383asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
384 unsigned nsops)
385{
386 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
387}
388
389asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
390 void __user *ptr, long fifth)
391{
392 switch (call & 0xffff) {
393 case SEMOP:
394 return sys_oabi_semtimedop(first,
395 (struct oabi_sembuf __user *)ptr,
396 second, NULL);
397 case SEMTIMEDOP:
398 return sys_oabi_semtimedop(first,
399 (struct oabi_sembuf __user *)ptr,
400 second,
401 (const struct old_timespec32 __user *)fifth);
402 default:
403 return sys_ipc(call, first, second, third, ptr, fifth);
404 }
405}
406#else
407asmlinkage long sys_oabi_semtimedop(int semid,
408 struct oabi_sembuf __user *tsops,
409 unsigned nsops,
410 const struct old_timespec32 __user *timeout)
411{
412 return -ENOSYS;
413}
414
415asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
416 unsigned nsops)
417{
418 return -ENOSYS;
419}
420
421asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
422 void __user *ptr, long fifth)
423{
424 return -ENOSYS;
425}
426#endif
427
428asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
429{
430 sa_family_t sa_family;
431 if (addrlen == 112 &&
432 get_user(sa_family, &addr->sa_family) == 0 &&
433 sa_family == AF_UNIX)
434 addrlen = 110;
435 return sys_bind(fd, addr, addrlen);
436}
437
438asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
439{
440 sa_family_t sa_family;
441 if (addrlen == 112 &&
442 get_user(sa_family, &addr->sa_family) == 0 &&
443 sa_family == AF_UNIX)
444 addrlen = 110;
445 return sys_connect(fd, addr, addrlen);
446}
447
448asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
449 size_t len, unsigned flags,
450 struct sockaddr __user *addr,
451 int addrlen)
452{
453 sa_family_t sa_family;
454 if (addrlen == 112 &&
455 get_user(sa_family, &addr->sa_family) == 0 &&
456 sa_family == AF_UNIX)
457 addrlen = 110;
458 return sys_sendto(fd, buff, len, flags, addr, addrlen);
459}
460
461asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
462{
463 struct sockaddr __user *addr;
464 int msg_namelen;
465 sa_family_t sa_family;
466 if (msg &&
467 get_user(msg_namelen, &msg->msg_namelen) == 0 &&
468 msg_namelen == 112 &&
469 get_user(addr, &msg->msg_name) == 0 &&
470 get_user(sa_family, &addr->sa_family) == 0 &&
471 sa_family == AF_UNIX)
472 {
473 /*
474 * HACK ALERT: there is a limit to how much backward bending
475 * we should do for what is actually a transitional
476 * compatibility layer. This already has known flaws with
477 * a few ioctls that we don't intend to fix. Therefore
478 * consider this blatent hack as another one... and take care
479 * to run for cover. In most cases it will "just work fine".
480 * If it doesn't, well, tough.
481 */
482 put_user(110, &msg->msg_namelen);
483 }
484 return sys_sendmsg(fd, msg, flags);
485}
486
487asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
488{
489 unsigned long r = -EFAULT, a[6];
490
491 switch (call) {
492 case SYS_BIND:
493 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
494 r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
495 break;
496 case SYS_CONNECT:
497 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
498 r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
499 break;
500 case SYS_SENDTO:
501 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
502 r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
503 (struct sockaddr __user *)a[4], a[5]);
504 break;
505 case SYS_SENDMSG:
506 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
507 r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
508 break;
509 default:
510 r = sys_socketcall(call, args);
511 }
512
513 return r;
514}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/kernel/sys_oabi-compat.c
4 *
5 * Compatibility wrappers for syscalls that are used from
6 * old ABI user space binaries with an EABI kernel.
7 *
8 * Author: Nicolas Pitre
9 * Created: Oct 7, 2005
10 * Copyright: MontaVista Software, Inc.
11 */
12
13/*
14 * The legacy ABI and the new ARM EABI have different rules making some
15 * syscalls incompatible especially with structure arguments.
16 * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
17 * simply word aligned. EABI also pads structures to the size of the largest
18 * member it contains instead of the invariant 32-bit.
19 *
20 * The following syscalls are affected:
21 *
22 * sys_stat64:
23 * sys_lstat64:
24 * sys_fstat64:
25 * sys_fstatat64:
26 *
27 * struct stat64 has different sizes and some members are shifted
28 * Compatibility wrappers are needed for them and provided below.
29 *
30 * sys_fcntl64:
31 *
32 * struct flock64 has different sizes and some members are shifted
33 * A compatibility wrapper is needed and provided below.
34 *
35 * sys_statfs64:
36 * sys_fstatfs64:
37 *
38 * struct statfs64 has extra padding with EABI growing its size from
39 * 84 to 88. This struct is now __attribute__((packed,aligned(4)))
40 * with a small assembly wrapper to force the sz argument to 84 if it is 88
41 * to avoid copying the extra padding over user space unexpecting it.
42 *
43 * sys_newuname:
44 *
45 * struct new_utsname has no padding with EABI. No problem there.
46 *
47 * sys_epoll_ctl:
48 * sys_epoll_wait:
49 *
50 * struct epoll_event has its second member shifted also affecting the
51 * structure size. Compatibility wrappers are needed and provided below.
52 *
53 * sys_ipc:
54 * sys_semop:
55 * sys_semtimedop:
56 *
57 * struct sembuf loses its padding with EABI. Since arrays of them are
58 * used they have to be copyed to remove the padding. Compatibility wrappers
59 * provided below.
60 *
61 * sys_bind:
62 * sys_connect:
63 * sys_sendmsg:
64 * sys_sendto:
65 * sys_socketcall:
66 *
67 * struct sockaddr_un loses its padding with EABI. Since the size of the
68 * structure is used as a validation test in unix_mkname(), we need to
69 * change the length argument to 110 whenever it is 112. Compatibility
70 * wrappers provided below.
71 */
72
73#include <linux/syscalls.h>
74#include <linux/errno.h>
75#include <linux/fs.h>
76#include <linux/cred.h>
77#include <linux/fcntl.h>
78#include <linux/eventpoll.h>
79#include <linux/sem.h>
80#include <linux/socket.h>
81#include <linux/net.h>
82#include <linux/ipc.h>
83#include <linux/uaccess.h>
84#include <linux/slab.h>
85
86struct 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
115static 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 = from_kuid_munged(current_user_ns(), stat->uid);
126 tmp.st_gid = from_kgid_munged(current_user_ns(), 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
142asmlinkage long sys_oabi_stat64(const 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
152asmlinkage long sys_oabi_lstat64(const 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
162asmlinkage 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
172asmlinkage long sys_oabi_fstatat64(int dfd,
173 const char __user *filename,
174 struct oldabi_stat64 __user *statbuf,
175 int flag)
176{
177 struct kstat stat;
178 int error;
179
180 error = vfs_fstatat(dfd, filename, &stat, flag);
181 if (error)
182 return error;
183 return cp_oldabi_stat64(&stat, statbuf);
184}
185
186struct oabi_flock64 {
187 short l_type;
188 short l_whence;
189 loff_t l_start;
190 loff_t l_len;
191 pid_t l_pid;
192} __attribute__ ((packed,aligned(4)));
193
194static long do_locks(unsigned int fd, unsigned int cmd,
195 unsigned long arg)
196{
197 struct flock64 kernel;
198 struct oabi_flock64 user;
199 mm_segment_t fs;
200 long ret;
201
202 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
203 sizeof(user)))
204 return -EFAULT;
205 kernel.l_type = user.l_type;
206 kernel.l_whence = user.l_whence;
207 kernel.l_start = user.l_start;
208 kernel.l_len = user.l_len;
209 kernel.l_pid = user.l_pid;
210
211 fs = get_fs();
212 set_fs(KERNEL_DS);
213 ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel);
214 set_fs(fs);
215
216 if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) {
217 user.l_type = kernel.l_type;
218 user.l_whence = kernel.l_whence;
219 user.l_start = kernel.l_start;
220 user.l_len = kernel.l_len;
221 user.l_pid = kernel.l_pid;
222 if (copy_to_user((struct oabi_flock64 __user *)arg,
223 &user, sizeof(user)))
224 ret = -EFAULT;
225 }
226 return ret;
227}
228
229asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
230 unsigned long arg)
231{
232 switch (cmd) {
233 case F_OFD_GETLK:
234 case F_OFD_SETLK:
235 case F_OFD_SETLKW:
236 case F_GETLK64:
237 case F_SETLK64:
238 case F_SETLKW64:
239 return do_locks(fd, cmd, arg);
240
241 default:
242 return sys_fcntl64(fd, cmd, arg);
243 }
244}
245
246struct oabi_epoll_event {
247 __u32 events;
248 __u64 data;
249} __attribute__ ((packed,aligned(4)));
250
251#ifdef CONFIG_EPOLL
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
258 if (ep_op_has_event(op) &&
259 copy_from_user(&user, event, sizeof(user)))
260 return -EFAULT;
261
262 kernel.events = user.events;
263 kernel.data = user.data;
264
265 return do_epoll_ctl(epfd, op, fd, &kernel, false);
266}
267
268asmlinkage long sys_oabi_epoll_wait(int epfd,
269 struct oabi_epoll_event __user *events,
270 int maxevents, int timeout)
271{
272 struct epoll_event *kbuf;
273 struct oabi_epoll_event e;
274 mm_segment_t fs;
275 long ret, err, i;
276
277 if (maxevents <= 0 ||
278 maxevents > (INT_MAX/sizeof(*kbuf)) ||
279 maxevents > (INT_MAX/sizeof(*events)))
280 return -EINVAL;
281 if (!access_ok(events, sizeof(*events) * maxevents))
282 return -EFAULT;
283 kbuf = kmalloc_array(maxevents, sizeof(*kbuf), 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 e.events = kbuf[i].events;
293 e.data = kbuf[i].data;
294 err = __copy_to_user(events, &e, sizeof(e));
295 if (err)
296 break;
297 events++;
298 }
299 kfree(kbuf);
300 return err ? -EFAULT : ret;
301}
302#else
303asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
304 struct oabi_epoll_event __user *event)
305{
306 return -EINVAL;
307}
308
309asmlinkage long sys_oabi_epoll_wait(int epfd,
310 struct oabi_epoll_event __user *events,
311 int maxevents, int timeout)
312{
313 return -EINVAL;
314}
315#endif
316
317struct oabi_sembuf {
318 unsigned short sem_num;
319 short sem_op;
320 short sem_flg;
321 unsigned short __pad;
322};
323
324asmlinkage long sys_oabi_semtimedop(int semid,
325 struct oabi_sembuf __user *tsops,
326 unsigned nsops,
327 const struct old_timespec32 __user *timeout)
328{
329 struct sembuf *sops;
330 struct old_timespec32 local_timeout;
331 long err;
332 int i;
333
334 if (nsops < 1 || nsops > SEMOPM)
335 return -EINVAL;
336 if (!access_ok(tsops, sizeof(*tsops) * nsops))
337 return -EFAULT;
338 sops = kmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
339 if (!sops)
340 return -ENOMEM;
341 err = 0;
342 for (i = 0; i < nsops; i++) {
343 struct oabi_sembuf osb;
344 err |= __copy_from_user(&osb, tsops, sizeof(osb));
345 sops[i].sem_num = osb.sem_num;
346 sops[i].sem_op = osb.sem_op;
347 sops[i].sem_flg = osb.sem_flg;
348 tsops++;
349 }
350 if (timeout) {
351 /* copy this as well before changing domain protection */
352 err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
353 timeout = &local_timeout;
354 }
355 if (err) {
356 err = -EFAULT;
357 } else {
358 mm_segment_t fs = get_fs();
359 set_fs(KERNEL_DS);
360 err = sys_semtimedop_time32(semid, sops, nsops, timeout);
361 set_fs(fs);
362 }
363 kfree(sops);
364 return err;
365}
366
367asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
368 unsigned nsops)
369{
370 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
371}
372
373asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
374 void __user *ptr, long fifth)
375{
376 switch (call & 0xffff) {
377 case SEMOP:
378 return sys_oabi_semtimedop(first,
379 (struct oabi_sembuf __user *)ptr,
380 second, NULL);
381 case SEMTIMEDOP:
382 return sys_oabi_semtimedop(first,
383 (struct oabi_sembuf __user *)ptr,
384 second,
385 (const struct old_timespec32 __user *)fifth);
386 default:
387 return sys_ipc(call, first, second, third, ptr, fifth);
388 }
389}
390
391asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
392{
393 sa_family_t sa_family;
394 if (addrlen == 112 &&
395 get_user(sa_family, &addr->sa_family) == 0 &&
396 sa_family == AF_UNIX)
397 addrlen = 110;
398 return sys_bind(fd, addr, addrlen);
399}
400
401asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, 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_connect(fd, addr, addrlen);
409}
410
411asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
412 size_t len, unsigned flags,
413 struct sockaddr __user *addr,
414 int addrlen)
415{
416 sa_family_t sa_family;
417 if (addrlen == 112 &&
418 get_user(sa_family, &addr->sa_family) == 0 &&
419 sa_family == AF_UNIX)
420 addrlen = 110;
421 return sys_sendto(fd, buff, len, flags, addr, addrlen);
422}
423
424asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
425{
426 struct sockaddr __user *addr;
427 int msg_namelen;
428 sa_family_t sa_family;
429 if (msg &&
430 get_user(msg_namelen, &msg->msg_namelen) == 0 &&
431 msg_namelen == 112 &&
432 get_user(addr, &msg->msg_name) == 0 &&
433 get_user(sa_family, &addr->sa_family) == 0 &&
434 sa_family == AF_UNIX)
435 {
436 /*
437 * HACK ALERT: there is a limit to how much backward bending
438 * we should do for what is actually a transitional
439 * compatibility layer. This already has known flaws with
440 * a few ioctls that we don't intend to fix. Therefore
441 * consider this blatent hack as another one... and take care
442 * to run for cover. In most cases it will "just work fine".
443 * If it doesn't, well, tough.
444 */
445 put_user(110, &msg->msg_namelen);
446 }
447 return sys_sendmsg(fd, msg, flags);
448}
449
450asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
451{
452 unsigned long r = -EFAULT, a[6];
453
454 switch (call) {
455 case SYS_BIND:
456 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
457 r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
458 break;
459 case SYS_CONNECT:
460 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
461 r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
462 break;
463 case SYS_SENDTO:
464 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
465 r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
466 (struct sockaddr __user *)a[4], a[5]);
467 break;
468 case SYS_SENDMSG:
469 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
470 r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
471 break;
472 default:
473 r = sys_socketcall(call, args);
474 }
475
476 return r;
477}