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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/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}
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/ipc_namespace.h>
84#include <linux/uaccess.h>
85#include <linux/slab.h>
86
87#include <asm/syscall.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 int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
198{
199 struct oabi_flock64 user;
200
201 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
202 sizeof(user)))
203 return -EFAULT;
204
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 return 0;
212}
213
214static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
215{
216 struct oabi_flock64 user;
217
218 user.l_type = kernel->l_type;
219 user.l_whence = kernel->l_whence;
220 user.l_start = kernel->l_start;
221 user.l_len = kernel->l_len;
222 user.l_pid = kernel->l_pid;
223
224 if (copy_to_user((struct oabi_flock64 __user *)arg,
225 &user, sizeof(user)))
226 return -EFAULT;
227
228 return 0;
229}
230
231asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
232 unsigned long arg)
233{
234 void __user *argp = (void __user *)arg;
235 struct fd f = fdget_raw(fd);
236 struct flock64 flock;
237 long err = -EBADF;
238
239 if (!f.file)
240 goto out;
241
242 switch (cmd) {
243 case F_GETLK64:
244 case F_OFD_GETLK:
245 err = security_file_fcntl(f.file, cmd, arg);
246 if (err)
247 break;
248 err = get_oabi_flock(&flock, argp);
249 if (err)
250 break;
251 err = fcntl_getlk64(f.file, cmd, &flock);
252 if (!err)
253 err = put_oabi_flock(&flock, argp);
254 break;
255 case F_SETLK64:
256 case F_SETLKW64:
257 case F_OFD_SETLK:
258 case F_OFD_SETLKW:
259 err = security_file_fcntl(f.file, cmd, arg);
260 if (err)
261 break;
262 err = get_oabi_flock(&flock, argp);
263 if (err)
264 break;
265 err = fcntl_setlk64(fd, f.file, cmd, &flock);
266 break;
267 default:
268 err = sys_fcntl64(fd, cmd, arg);
269 break;
270 }
271 fdput(f);
272out:
273 return err;
274}
275
276struct oabi_epoll_event {
277 __poll_t events;
278 __u64 data;
279} __attribute__ ((packed,aligned(4)));
280
281#ifdef CONFIG_EPOLL
282asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
283 struct oabi_epoll_event __user *event)
284{
285 struct oabi_epoll_event user;
286 struct epoll_event kernel;
287
288 if (ep_op_has_event(op) &&
289 copy_from_user(&user, event, sizeof(user)))
290 return -EFAULT;
291
292 kernel.events = user.events;
293 kernel.data = user.data;
294
295 return do_epoll_ctl(epfd, op, fd, &kernel, false);
296}
297#else
298asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
299 struct oabi_epoll_event __user *event)
300{
301 return -EINVAL;
302}
303#endif
304
305struct epoll_event __user *
306epoll_put_uevent(__poll_t revents, __u64 data,
307 struct epoll_event __user *uevent)
308{
309 if (in_oabi_syscall()) {
310 struct oabi_epoll_event __user *oevent = (void __user *)uevent;
311
312 if (__put_user(revents, &oevent->events) ||
313 __put_user(data, &oevent->data))
314 return NULL;
315
316 return (void __user *)(oevent+1);
317 }
318
319 if (__put_user(revents, &uevent->events) ||
320 __put_user(data, &uevent->data))
321 return NULL;
322
323 return uevent+1;
324}
325
326struct oabi_sembuf {
327 unsigned short sem_num;
328 short sem_op;
329 short sem_flg;
330 unsigned short __pad;
331};
332
333#define sc_semopm sem_ctls[2]
334
335#ifdef CONFIG_SYSVIPC
336asmlinkage long sys_oabi_semtimedop(int semid,
337 struct oabi_sembuf __user *tsops,
338 unsigned nsops,
339 const struct old_timespec32 __user *timeout)
340{
341 struct ipc_namespace *ns;
342 struct sembuf *sops;
343 long err;
344 int i;
345
346 ns = current->nsproxy->ipc_ns;
347 if (nsops > ns->sc_semopm)
348 return -E2BIG;
349 if (nsops < 1 || nsops > SEMOPM)
350 return -EINVAL;
351 sops = kvmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
352 if (!sops)
353 return -ENOMEM;
354 err = 0;
355 for (i = 0; i < nsops; i++) {
356 struct oabi_sembuf osb;
357 err |= copy_from_user(&osb, tsops, sizeof(osb));
358 sops[i].sem_num = osb.sem_num;
359 sops[i].sem_op = osb.sem_op;
360 sops[i].sem_flg = osb.sem_flg;
361 tsops++;
362 }
363 if (err) {
364 err = -EFAULT;
365 goto out;
366 }
367
368 if (timeout) {
369 struct timespec64 ts;
370 err = get_old_timespec32(&ts, timeout);
371 if (err)
372 goto out;
373 err = __do_semtimedop(semid, sops, nsops, &ts, ns);
374 goto out;
375 }
376 err = __do_semtimedop(semid, sops, nsops, NULL, ns);
377out:
378 kvfree(sops);
379 return err;
380}
381
382asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
383 unsigned nsops)
384{
385 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
386}
387
388asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
389 void __user *ptr, long fifth)
390{
391 switch (call & 0xffff) {
392 case SEMOP:
393 return sys_oabi_semtimedop(first,
394 (struct oabi_sembuf __user *)ptr,
395 second, NULL);
396 case SEMTIMEDOP:
397 return sys_oabi_semtimedop(first,
398 (struct oabi_sembuf __user *)ptr,
399 second,
400 (const struct old_timespec32 __user *)fifth);
401 default:
402 return sys_ipc(call, first, second, third, ptr, fifth);
403 }
404}
405#else
406asmlinkage long sys_oabi_semtimedop(int semid,
407 struct oabi_sembuf __user *tsops,
408 unsigned nsops,
409 const struct old_timespec32 __user *timeout)
410{
411 return -ENOSYS;
412}
413
414asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
415 unsigned nsops)
416{
417 return -ENOSYS;
418}
419
420asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
421 void __user *ptr, long fifth)
422{
423 return -ENOSYS;
424}
425#endif
426
427asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
428{
429 sa_family_t sa_family;
430 if (addrlen == 112 &&
431 get_user(sa_family, &addr->sa_family) == 0 &&
432 sa_family == AF_UNIX)
433 addrlen = 110;
434 return sys_bind(fd, addr, addrlen);
435}
436
437asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
438{
439 sa_family_t sa_family;
440 if (addrlen == 112 &&
441 get_user(sa_family, &addr->sa_family) == 0 &&
442 sa_family == AF_UNIX)
443 addrlen = 110;
444 return sys_connect(fd, addr, addrlen);
445}
446
447asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
448 size_t len, unsigned flags,
449 struct sockaddr __user *addr,
450 int addrlen)
451{
452 sa_family_t sa_family;
453 if (addrlen == 112 &&
454 get_user(sa_family, &addr->sa_family) == 0 &&
455 sa_family == AF_UNIX)
456 addrlen = 110;
457 return sys_sendto(fd, buff, len, flags, addr, addrlen);
458}
459
460asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
461{
462 struct sockaddr __user *addr;
463 int msg_namelen;
464 sa_family_t sa_family;
465 if (msg &&
466 get_user(msg_namelen, &msg->msg_namelen) == 0 &&
467 msg_namelen == 112 &&
468 get_user(addr, &msg->msg_name) == 0 &&
469 get_user(sa_family, &addr->sa_family) == 0 &&
470 sa_family == AF_UNIX)
471 {
472 /*
473 * HACK ALERT: there is a limit to how much backward bending
474 * we should do for what is actually a transitional
475 * compatibility layer. This already has known flaws with
476 * a few ioctls that we don't intend to fix. Therefore
477 * consider this blatent hack as another one... and take care
478 * to run for cover. In most cases it will "just work fine".
479 * If it doesn't, well, tough.
480 */
481 put_user(110, &msg->msg_namelen);
482 }
483 return sys_sendmsg(fd, msg, flags);
484}
485
486asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
487{
488 unsigned long r = -EFAULT, a[6];
489
490 switch (call) {
491 case SYS_BIND:
492 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
493 r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
494 break;
495 case SYS_CONNECT:
496 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
497 r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
498 break;
499 case SYS_SENDTO:
500 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
501 r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
502 (struct sockaddr __user *)a[4], a[5]);
503 break;
504 case SYS_SENDMSG:
505 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
506 r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
507 break;
508 default:
509 r = sys_socketcall(call, args);
510 }
511
512 return r;
513}